JPH0371986B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for controlling plate supply and ejection in a printing press that enables multi-color printing, and in particular, when a mistake in winding the plate around the plate cylinder occurs on the plate feeding device side. The present invention relates to a plate feeding/discharging control method for a printing press that can automatically stop the printing press when the printing press is turned off.

(Prior art and its problems) In printing machines that are capable of automatically feeding and discharging plates, in general, if a mistake occurs in wrapping the plate around the plate cylinder, the ink form roller will directly remove the plate without passing through the plate. There has been a problem in that the plate cylinder becomes dirty due to ink build-up on the cylinder, or in some cases, the plate gets caught in the printing press, causing damage to the plate and malfunction of the printing press. In order to solve the above problem, it would be possible to separately provide a detection mechanism to detect plate wrapping errors, but in that case, the structure would become complicated, especially in printing machines that can print in multiple colors. This has the problem that the structure becomes extremely complex because it requires as many detection mechanisms as there are plate cylinders, and on the other hand, it also controls the operation of multiple plate feeding devices and plate discharging devices that feed and discharge plates to and from each plate cylinder. Therefore, it was desired to simplify the structure and control.

(Purpose of the Invention) This invention was made to solve the above problems, and uses a simple structure to detect errors in wrapping the plate around the plate cylinder in a multicolor printing machine that enables automatic plate feeding and ejection. The purpose of the present invention is to provide a method for controlling plate feeding and discharging of a printing press, which can prevent various inconveniences caused by mistakes in plate winding, and which can simplify the control of the plate feeding device and the plate discharging device. do.

(Means for Achieving the Object) A printing press to which the present invention is applied includes a plurality of plate cylinders, a plurality of plate feeding devices and plate discharging devices provided corresponding to each plate cylinder, and a plurality of plate feeding devices and plate discharging devices installed in each plate feeding device. A plurality of plate presence detection sensors that detect the presence or absence of a plate to be loaded, and a control unit that controls the operation of the plate cylinder, plate feeding device, plate discharge device, and plate presence detection sensor, enable automatic plate feeding and discharging. It is a multicolor printing machine. and,
The plate feeding control method for a printing press according to the present invention detects the presence or absence of a plate on the corresponding plate feeding device using each plate presence detection sensor based on a plate supply/discharge operation command, and if no plate is detected, the corresponding plate discharge is detected. Only the device is operated, and when a plate is detected, the corresponding plate ejecting device and plate feeding device are operated simultaneously, and as the plate cylinder rotates,
A plate discharging operation for discharging the plate wound around the corresponding plate cylinder is performed in advance, and a plate feeding operation is performed in parallel to sequentially feed the plates on the plate feeding device to the position of the plate cylinder after the plate discharging operation. , after feeding the plate, the presence or absence of a plate on the corresponding plate feeding device is detected again by the plate presence detection sensor, and at least one plate is detected on any one of all the plurality of plate feeding devices; The point is to stop the motor of this machine.

(Example) A method of controlling plate feeding and discharging of a printing press according to the present invention will be explained using the printing press described below.

A. General Structure FIG. 1 shows a schematic cross-sectional view of a multicolor offset printing machine that is capable of printing on continuous paper. As shown in the figure, a blanket cylinder 2 is disposed approximately in the center of the printing press body 1, and a plate cylinder that can be freely detached from and attached to the blanket cylinder 2 is located at an upper rear position and a lower rear position of the blanket cylinder 2. 3 and 4 are arranged respectively. At the rear of these plate cylinders 3, 4, there are plate supply/discharge units 5, 6 that enable automatic plate supply/discharge to the corresponding plate cylinders 3, 4, and plate supply/discharge units 5, 6 for automatically supplying/discharging plates to/from the corresponding plate cylinders 3, 4, as well as plate supply/discharge units 5, 6 for automatically supplying/discharging plates to/from the corresponding plate cylinders 3, 4. Inking units 7 and 8 for applying ink are removably installed, respectively.
In addition, each plate supply/discharge unit 5, 6 has a plate supply/discharge tray 9,
10 is detachably attached.

On the other hand, at the lower front position of the blanket body 2,
An impression cylinder 11 that can be freely attached to and taken off from the blanket cylinder 2 is disposed, and paper feeding of the continuous paper 12 passed between the impression cylinder 11 and the blanket cylinder 2 is carried out at the rear and front positions of the lower part of the impression cylinder 11. A pin feed tractor 13 and a suction conveyor 14 are respectively provided for control. These pin feed tractor 13 and suction conveyor 14 are connected to the impression cylinder 11 and the blanket cylinder 2.
Continuous paper 12
The continuous paper 12 is configured to be printed by controlling the paper feed intermittently. In addition, in the front position of the printing press body 1, there is a swing guide 15 for storing printed continuous paper 12 in an alternately folded manner, and a continuous paper holder 1 that can be raised and lowered.
A folding machine 17 having 6 is arranged.
Furthermore, an impression cylinder cleaning unit 29 is provided below the impression cylinder 11 to remove dirt from the surface of the impression cylinder.

In addition, at the upper front position of the blanket body 2,
When cleaning the blanket, the blanket body 2
Cleaning liquid supply unit 1 for supplying cleaning liquid to
8 and a wiping unit 19 for wiping off the cleaning liquid are each removably attached.

A main motor 20 as a main motor is installed in the lower space of the printing press body 1, and the blanket cylinder 2 and suction conveyor 14 are driven by the main motor 20 via, for example, a belt, and the blanket cylinder 2 and plate cylinder 3, 4 and the impression cylinder 11 are mechanically interlocked by gears disposed to mesh at one end of each cylinder,
A drive system includes a main motor 20.
Drive devices or actuators such as pulse motors and solenoids are attached to the remaining mechanical parts as necessary, and sensors and switches are installed at predetermined and necessary locations as information input means for controlling the drive timing of these drive systems. It is installed.

FIG. 2 schematically shows a control system used in this printing press, in which a microprocessor 21 is connected to external devices 24 to 28 via a control bus 22 and each control section 23. The system program is stored in an external storage device 24 such as a floppy disk, and is given to the microprocessor 21 at the beginning of system startup. The operator gives commands through an operation panel 25 installed on the side of the printing press, and the microprocessor 21 receives necessary information from sensors and switches 26 and 27 to operate the motors and motors according to the system program. The drive system 28 such as a solenoid is operated as appropriate.

The configuration, operation, etc. related to feeding and discharging plates will be explained below.

B. Plate supply/discharge relation (1) Configuration and installation of plate supply/discharge unit (a) Configuration of plate supply/discharge unit Figure 3 shows the plate supply/discharge unit 5. In the figure, Figure a is a front view of the plate supply/discharge unit 5, Figure b is a plan view, Figure c is a sectional view, Figure d is a right side view, and Figure e is a left side view.

This supply/discharge plate unit 5 has a handle 502 and unit mounting screws 503 attached to both front sides of a unit frame 501 having a frame-like structure. Left side plate 501a and right partition plate 5 of unit frame 501
At the front of the inner surface of 01b, there is a plate supply/discharge tray 9 (first
A locking pin 504 and a positioning pin 505 are protrudingly provided for attaching the holder (FIG.). Further, a unit mounting rail 506 is attached to the lower part of the outer surface of the left side plate 501a and right side plate 501c of the unit frame 501. In addition, a connector 508 is attached to the outer surface of the right side plate 501c via a mounting bracket 507, and a pulse motor 50 for plate feeding start is attached.
9 is attached, and these pulse motors 509 and connectors 508 are electrically connected via a cord (not shown).

Between the left side plate 501a and the right partition plate 501b of the unit frame 501, there is a plate feeding drive roller 510.
Then, a plate discharge drive roller 511 is rotatably attached. The plate feeding drive roller 510 has its roller shaft 5
The right end of the plate 10a is connected to the pulse motor 509 via a shaft joint (not shown), and is driven to rotate counterclockwise in FIG. 3c by the pulse motor 509 at the start of plate feeding. Discharge drive roller 5
11, the right end of the roller shaft 511a is extended to between the right partition plate 501b and the right side plate 501c, and a gear 512 (FIG. 3 d) is attached to the extended part, and this gear 512 is also connected to the right partition plate 501b.
and a drive gear 514 via another gear 513 disposed between the right side plate 501c and the right side plate 501c. This drive gear 514 connects the plate supply/discharge unit 5 to the printing press main body 1.
When mounted on the plate cylinder, it meshes with the plate cylinder gear 301 (FIG. 9), thereby driving the plate discharge drive roller 511 to rotate in the counterclockwise direction as shown in FIG. .

The plate feeding drive roller 510 and the plate discharge drive roller 5
In the middle area of No. 11, a support metal fitting 515 is stretched between the left side plate 501a and the right partition plate 501b, a plate feeding start plate 516 is attached to the upper surface side of this support metal fitting 515, and a plate discharge guide 517 is attached to the lower surface side. Installed. Plate feeding start board 5
16, a roller exit/exit opening 516a is formed at a position corresponding to the plate feeding drive roller 510.

At the front position of the plate feeding start plate 516,
The drive shaft 5 is connected between the left side plate 501a and the right partition plate 501b.
18 is rotatably spanned, and this drive shaft 518
A support arm 519 is attached to both ends of the support arm 519, and a plate feeding auxiliary drive roller 520 is rotatably attached between the tips of these support arms 519. An operating lever 521 is attached to the left end of the drive shaft 518 as shown in FIG.
The support arm 519 is rotated in the forward and reverse directions around the drive shaft 518 by forward and reverse rotation operations, and the plate feeding auxiliary drive roller 520 can be driven to and from the plate feeding drive roller 510 through the roller exit/extrusion opening 516a. be done. This operating lever 521 is urged to rotate counterclockwise by a spring 522 shown in FIG. , 520 are separated from each other, the operating lever 521 is engaged with a stopper pin 523 protruding from the outer surface of the left side plate 501a, thereby restricting rotation. This actuating lever 521 is driven in conjunction with the ON operation of a solenoid (described later) provided on the printing press main body 1 side, and brings the plate feeding auxiliary drive roller 520 into contact with the plate feeding drive roller 510. roller 510,
520, it is possible to nip the plate and start plate feeding. The plate feeding auxiliary drive roller 520 has a gear (not shown) attached to the left end of the roller shaft 520a.
is meshed with a gear (not shown) attached to the left end of the plate feeding drive roller shaft 510a, thereby causing the plate feeding drive roller 510 to move to the third position during plate feeding.
When the plate feeding auxiliary drive roller 520 is driven to rotate in the counterclockwise direction in FIG. It is constructed so that the printed plate can be sent out to the plate cylinder side (to the right in Figure 3c).

At the upper part of the rear end of the unit frame 501, a rotating shaft 524 is rotatably attached between the left side plate 501a and the right partition plate 501b, and a roller support arm 526 holding a plate feeding press roller 525 is attached.
It is rotatably attached to the rotating shaft 524. The roller support arm 526 is biased to rotate in the clockwise direction (i.e., in the plate pressing direction) in FIG. 3c by a torsion coil spring 527 (FIG. 3b) attached to the rotating shaft 524, and is rotated at an appropriate position as shown in the figure. Rotation in the clockwise direction is restricted by a stopper mechanism omitting the .

As shown in FIG. 4, a locking mechanism 528 is provided at the right end of the rotating shaft 524 for locking the plate feeding press roller 525 at the plate holding position. This lock mechanism 528 has an engaging groove 529a on the outer periphery.
A ratchet wheel 529 having a
A plate feed presser operating arm 531 holding a plate is also fixed to the rotating shaft 524. The plate feeding presser arm 531 is configured to be rotatable within the range shown by the imaginary line and the solid line in FIG. ) in the clockwise direction in FIG. 4b, so that the plate feeding press roller 525 is separated from the plate cylinder 3 via the shaft 524 at the clockwise rotation position. On the other hand, a lock release arm 533 with a lock release roller 537 attached to its tip and a ratchet 534 are integrally connected and rotatably attached to a shaft 535 provided on the right partition plate 501b, and a spring 536 The tip of the ratchet 534 is rotated in the counterclockwise direction in FIG. 4b by
The ratchet foil 529 is slidably pressed against the outer peripheral portion 529b and the valley portion 529a.

This locking mechanism 528 is operated by a plate feeding presser roller cam 356 (see FIG. 18; details will be described later) provided on the plate cylinder 3 side.
0 is pushed counterclockwise in FIG. 4b, the rotating shaft 524 also rotates counterclockwise, and the plate feeding press roller 525 is set at the plate holding position.
At the same time, the ratchet wheel 529 also rotates counterclockwise, and with this rotation, the ratchet wheel 53
4 moves from the outer peripheral part 529b of the ratchet wheel 529 to the trough 529a, and at this time, it falls into and locks in the trough 529a due to the biasing force of the spring 536, and the ratchet wheel 529 rotates clockwise due to the biasing force of the spring 532. The rotational return in the direction is prevented, and the plate feeding press roller 525 is held at the plate press position. This lock is released by kicking up the lock release roller 537 using the lock release cam 306 provided on the plate cylinder 3 side. When the lock release roller 537 is kicked up, the lock release arm 533 moves to the fourth position with the shaft 535 as a fulcrum.
The latch 534 rotates clockwise in FIG. The plate feed press roller 525 rotates together with the plate press operating arm 531 in the clockwise direction in FIG. 4B, and returns to its original position separated from the plate cylinder 3.

Returning to FIG. 3 again, unit frame 501
At the lower rear end, a rotating shaft 538 is rotatably attached between the left side plate 501a and the right partition plate 501b, and a support arm 540 holding a plate discharge pressing roller 539 is fixed to the rotating shaft 538. This rotating shaft 538 is connected to the third rotation shaft by a spring (not shown).
Clockwise direction in Figure c, that is, the discharge plate holding roller 53
9 is urged away from the plate cylinder 3. Also,
An operating lever 541 is attached to the right end of the rotating shaft 538, as shown in FIG. A stopper pin 542 for this purpose is provided protruding from the outer surface of the right side plate 501c. The operating lever 541 is rotated in the counterclockwise direction in FIG. Set it to the position where it will be pressed.

Further, as shown in FIG. 3c, the support arm 51
A plate presence detection sensor 544, which is a reflective photoelectric sensor, is mounted above the plate 9 to confirm the set state of the plate.

(b) Configuration of the side where the supply/discharge plate unit is attached Next, the configuration of the side where the supply/discharge plate unit 5 is attached will be explained. FIG. 5a shows a rear view of the printing press main body 1, and FIG. 5b shows the left side plate 1 shown in FIG. 5a.
01 is shown.

As shown in the figure, a pair of left and right rail receiving members 1
26 are fixed to the inner surfaces of the left side plate 101 and the right side plate 102. The rail receiving member 126 has a rail fitting groove 127 extending horizontally from the back side of the printing press body 1 toward the inside of the printing press body 1 on the opposing inner side surface, and has a screw hole 128 formed on the front side.

At a position above the front end of the right rail receiving member 126, the connector 129 is attached to the right side plate 102 via a mounting bracket 130. This connector 12
9 is connected to the microprocessor 21 via the control section 23 shown in FIG.

At a position above the rear end of the right rail receiving member 126, a drive lever 131 is disposed for operating the plate ejection pressing roller 539 of the plate supply/discharge unit 5 (FIG. 3) to attach to and detach from the plate cylinder 3. This drive lever 131
is the operating lever 5 of the supply/discharge plate unit 5 at its tip.
41 (FIG. 3 d), and is fixed to a drive shaft 133 rotatably attached to the right side plate 102. This drive shaft 133
The right end extends outward of the right side plate 102, and a lever 134 is attached to the right end, as shown in FIG. 7 (for convenience of explanation, illustration of the right side plate 102 is omitted). A spring 135 for biasing the lever 134 to rotate in the counterclockwise direction in FIG. A solenoid 137 for driving is attached to the right side plate (not shown), and the solenoid 137 and lever 134 are connected by a spring 138. This solenoid 13
7 is energized, the lever 134 is rotationally driven in the clockwise direction in FIG. set in position. Then, when the solenoid 137 is de-energized, the lever 134 rotates counterclockwise due to the biasing force of the spring 135 and returns to its original position, and the drive lever 131 also rotates counterclockwise accordingly. Operating lever 541 of supply/discharge plate unit 5
returns to the position where it is deactivated.

On the other hand, at the upper position of the left rail receiving member 126 (FIG. 5), the plate feeding auxiliary drive roller 520 (FIG. 3) of the plate feeding/discharging unit 5 is connected to the plate feeding driving roller 5.
A drive lever 140 is disposed at 10 to operate the attachment/detachment operation. This drive lever 140 has an engagement pin 141 at its tip that engages with the operating lever 521 of the plate supply/discharge unit 5, and is fixed to a drive shaft 142 rotatably attached to the left side plate 101.
The left end of this drive shaft 142 extends outward from the left side plate 101, and a lever 143 is attached to the left end as shown in FIG. 6 (for convenience of explanation, illustration of the left side plate 101 is omitted). Installed. A spring 144 for rotating this lever 143 in the clockwise direction in FIG. A solenoid 146 for driving is attached to the left side plate (not shown), and the solenoid 146 and the lever 143 are connected by a spring 148. Also, a stopper pin 149 for regulating the counterclockwise rotation of the lever 143 is provided on the left side plate (not shown).
It will be installed protrudingly. When this solenoid 146 is energized, the lever 143 is rotationally driven in the counterclockwise direction in FIG. is set to the position where it operates. Then, when the solenoid 146 is de-energized, the lever 14 is moved by the biasing force of the spring 144.
3 rotates clockwise and returns to its original position, and in conjunction with this, the drive lever 140 also rotates clockwise and returns to the position where the operating lever 521 of the plate supply/discharge unit 5 is released.

(c) Attaching the plate supply/discharge unit Next, the procedure for attaching the plate supply/discharge unit 5 to the printing press main body 1 will be explained. This mounting is performed in a state where neither of the solenoids 137 and 146 is energized.

The mounting procedure is to lift the plate supply/discharge unit 5 by holding the handle 502 with both hands, fit the rail 506 into the rail fitting groove 127 of the rail receiving member 126, and move the plate supply/discharge unit 5 to the back as shown in FIG. Push it in. When the supply/discharge plate unit 5 is pushed all the way, the unit mounting screw 503 is inserted into the rail receiving member 12.
Tighten and fix it in the screw hole 128 of No. 6 to complete the unit installation work.

In this way, when the supply/discharge plate unit 5 is installed,
The connector 508 (Fig. 3) on the unit side is connected to the connector 129 (Fig. 5) on the printing press main body 1 side, and the pulse motor 509 and plate presence detection sensor 544 (Fig. 3) of the plate supply/discharge unit 5 are It is electrically connected to the microprocessor 21 (FIG. 2).

In addition, as shown in FIG.
The tip of the operating lever 541 engages with the engagement pin 132 of the drive lever 131 provided on the printing press main body 1 side. Therefore, in this state, solenoid 1
37, the drive lever 131 moves to the drive shaft 1.
33 as a fulcrum, and as a result, the actuating lever 5
41 is rotated in the counterclockwise direction about the rotating shaft 538, and the discharge plate holding roller 539 is set at the plate holding position. Further, when the energization to the solenoid 137 is released, the discharge presser roller 539 returns to its original position separated from the plate cylinder 3 by an operation opposite to that described above.

In addition, by installing the unit, as shown in FIG.
It engages with the engagement pin 141 of 0. Therefore, if the solenoid 146 is energized in this state, the drive lever 140 rotates counterclockwise about the drive shaft 142, and accordingly, the operating lever 521 is rotationally driven clockwise about the drive shaft 518, The plate feeding auxiliary drive roller 520 of the plate supply/discharge unit 5 is set at a position where it comes into pressure contact with the plate feeding drive roller 510. Further, when the energization to the solenoid 146 is canceled, the plate feeding auxiliary drive roller 520 returns to its original position separated from the plate feeding drive roller 510 by the reverse operation to the above.

Removal of the plate supply/discharge unit 5 can be performed by following the procedure reverse to the procedure for mounting.

The plate supply/discharge unit 6 has the same structure as the plate supply/discharge unit 5, and its attachment/detachment work is performed in the same manner as the plate supply/discharge unit 5.

(2) Structure and installation of plate supply/discharge tray FIG. 8a shows a plan view of the plate supply/discharge tray 9, and FIG. 8b shows its side view. This tray 9
is provided with a plate feeding table 901 at the top thereof for sending out a plate for plate feeding, and a plate discharging table 902 for accommodating the plate being discharged at the bottom thereof. A plate bottom positioning member 903 for positioning the bottom end of the plate is attached to the rear position of the top surface of the plate feeding table 901, and side plates for positioning both sides of the plate are attached to both sides of the top surface of the plate feeding table 901. A part positioning member 904 is attached. In addition, tray attachment hooks 905 are formed on both sides of the front end of the plate supply/discharge tray 9.

To install the plate supply/discharge tray 9, as shown in FIG. Then, both front ends 906 of the tray 9 are locked to the positioning pins 505. To remove the tray 9, follow the above procedure in reverse.

The plate feeding and discharging tray 10 (FIG. 1) has the same structure as the plate feeding and discharging tray 9, and the operation of attaching and removing it to the plate feeding and discharging unit 6 is performed in the same manner as the plate feeding and discharging tray 9.

(3) Configuration of plate cylinder and printing press main body side FIG. 9 shows a view of the plate cylinder 3 viewed from the back side of the printing press main body 1. As shown in the figure, the plate cylinder 3 is
A plate cylinder gear 301 is fixed to the right end of the plate cylinder 3.
A plate cylinder gear 301 is rotatably held on a plate cylinder support shaft 302. The plate cylinder support shaft 302 is provided at both ends with eccentric shafts 303 having a rotation center 303a eccentric to the axis 302a of the plate cylinder support shaft 302.
It is rotatably held by bearings 304 attached to 01 and 102. This rotational drive of the plate cylinder 3 is achieved by moving the plate cylinder gear 301 to a blanket cylinder gear (not shown) provided at the right end of the blanket cylinder 2 (FIG. 1).
The plate cylinder 3 is moved in and out of the blanket cylinder 2 by driving the eccentric shaft 303 to rotate forward and backward within a certain angle using, for example, a pulse motor. .

This plate cylinder 3 is provided with an opening 307 in a part of its outer periphery over the entire width along the axial direction. Further, a plate head gripping mechanism 308 and a plate bottom gripping mechanism 309 are arranged at one end and the other end in the circumferential direction of the opening 307, respectively.

Hereinafter, the configurations of the plate cylinder side and the printing press main body side will be explained in order by dividing into each part.

Print head gripping mechanism The printing head gripping mechanism 308 is shown in FIGS. 9 and 10b.
As shown in FIG. 11b, a pawl shaft 311 is rotatably spanned between the left and right sides 310, 310 of the plate cylinder 3, and a plurality of pawl shafts 311 are arranged on the outer circumference of the pawl shaft 311 at equal pitches along the axial direction. The plate head gripping claw 312 is fixed. Links 3 are located near both ends of the claw shaft 311.
13 is fixed, and a tension spring 326 is suspended between the tip of this link 313 and a spring receiving pin 314 fixed in the plate cylinder 3, and the plate head gripping pawl 312 rotates around the pawl shaft 311 as shown in FIG. clockwise direction of b,
In other words, it is rotationally biased in the claw closing direction. The opening operation of the plate head gripping pawl 312 is performed by a plate head gripping pawl operating mechanism (described later) provided on the left end side of the plate cylinder 3.

On the other hand, a plate head positioning pin 315 is provided at the opening edge of the plate cylinder 3 at a position opposite to the plate head gripping claw 312.
is installed protrudingly. Then, the above-mentioned plate head gripping mechanism 30
The plate head gripping by 8 is performed by closing the plate head gripping claw 312 so that the plate head positioning pin 315 engages with a pin hole provided in the plate head of the plate (not shown).

Plate bottom gripping mechanism The plate bottom gripping mechanism 309 is shown in FIGS. 9 and 25.
As shown in the figure, left and right sides 310, 3 of the plate cylinder 3
A hook shaft 316 is rotatably spanned between the plates 10 and 10, and a plurality of plate bottom hooks 317 are fixed to the hook shaft 316 at equal pitches along the axial direction. A torsion coil spring 318 is externally mounted near the right end of the hook shaft 316, and the plate bottom hook 317 is urged to rotate around the hook shaft 316 in the counterclockwise direction in FIG. 25, that is, in the plate bottom pulling direction. Further, a link 319 is fixed to the right end of the hook shaft 316 on the outside of the plate cylinder gear 301.
9 is rotated in both forward and reverse directions by a plate tail hook operating mechanism, which will be described later, so that the plate tail hook 317 grips the plate tail and releases the plate tail.

10 and 11 (for ease of understanding, illustration of the left side plate 101 is omitted. The same applies to the following drawings. ) is provided with the supply/discharge plate cam mechanism shown in FIG.
This plate supply/discharge cam mechanism is constructed as follows. That is, the solenoid 150 is connected to the left side plate 10.
1, and a shaft 151 is rotatably attached to pass through the left side plate 101, and a link 152 and a set lever 153 are fixed to the outer and inner ends of the shaft 151, respectively. . Further, a set roller 154 is attached to the tip of the set lever 153. Further, a spring 155 is stretched between the link 152 and the solenoid 150, and a return spring 156 is stretched between the set lever 153 and the left side plate 101 for urging the set lever 153 to rotate clockwise. On the other hand, a feed/discharge plate cam 157 is rotatably attached via a shaft 158 protruding from the inner surface of the left side plate 101, and a lock lever 159 is also attached to the left side plate 101.
A tension spring 161 is tensioned between the supply/discharge plate cam 157 and the lock lever 159 to prevent the lock lever 159 from rotating in the counterclockwise direction. , is regulated by being engaged with a lock pin 157a provided at the tip of the supply/discharge plate cam 157.

The operation of the plate supply/discharge cam mechanism is as follows. That is, when the solenoid 150 is turned on,
The link 152 rotates counterclockwise in FIG. 10 via the spring 155, and the set lever 1 is rotated accordingly.
53 resists the biasing force of the return spring 156, and the shaft 15
Rotate counterclockwise using 1 as a fulcrum. Due to this rotation, the supply/discharge plate cam 157 is moved to the set roller 15.
4 and rotates counterclockwise about the shaft 158 as a fulcrum, and when the plate supply/discharge cam 157 rotates by a predetermined angle, the lock pin 157a falls into the groove 159a of the lock lever 159, and the plate supply/discharge cam 157 returns to its rotational position. (i.e.,
(locked). After the supply/discharge plate cam 157 is locked, when the solenoid 150 is turned off, the spring 1
55 is released, the link 152 and the set lever 153 are rotated clockwise about the shaft 151 by the biasing force of the return spring 156 and returned to their original positions. In this case, the supply/discharge plate cam 157 remains held at the above-mentioned locked position. As shown in FIG. 16, this plate supply/discharge cam 157 is unlocked by a roller 320 provided on the plate cylinder 3 side as the plate cylinder 3 rotates counterclockwise.
This is done by kicking up the tip of 9. That is, when the lock lever 159 is lifted up, the lock pin 157a provided on the supply/discharge plate cam 157 moves into the groove 159a of the lock lever 159.
The supply/discharge plate cam 157 is rotated clockwise by the tensile force of the tension spring 161 and returned to the original position shown in FIG. In this way, the lock of the supply/discharge plate cam 157 is released.

Plate head gripping claw operating mechanism A plate head gripping claw opening/closing mechanism is provided on the outer surface side of the left side 310 of the plate cylinder 3, as shown in FIGS. 10a and 11a. This operating mechanism is constructed as follows. That is, Figure 10b
The left end portion of the pawl shaft 311 shown in FIG. 10A is extended to the outside of the left side portion 310 of the plate cylinder 3 shown in FIG. 10A, and a link 321 is connected to the extended portion. Further, another link 322 is rotatably attached to a shaft 323 provided on the left side 310 of the plate cylinder 3. This link 322 has rollers 320 and 324 attached to its intermediate position and tip position, respectively. Further, a tension spring 3 is provided between the link 322 and the left side portion 310.
25 is stretched, and the link 322 is urged to rotate counterclockwise about the shaft 323, and its rotation is regulated by locking the roller 324 to the link 321.

The operation of this plate head gripping claw operating mechanism is as follows. That is, first, the plate feed/discharge cam 157 is locked as shown in FIG. As the link 322 rotates, the roller 320 of the link 322 rides on the cam surface 157b of the plate supply/discharge cam 157 and rolls on the cam surface 157b. This causes the link 322 to move to the shaft 323.
The other link 321 is pushed to the left by the roller 324 provided at the tip of the link 322 (15th
(see Figure 15), and the pawl shaft 311 rotates to the left (see Figure 15C). In this way, the pawl shaft 311 rotates to the left by overcoming the tension spring 326 shown in FIG.
12 is similarly rotated to the left, and the plate head gripping pawl 312 performs an "opening" action. As the plate cylinder 3 further rotates, the roller 32 of the link 322 is rotated as shown in FIG.
0 reaches the recess 157c of the supply/discharge plate cam 157,
The roller 320 falls into the recess 157c, and the pressing by the plate supply/discharge cam 157 is released. In this way, the links 322 and 321 released from the regulation of the feed/discharge plate cam 157 are moved to the shaft 323 and the claw shaft 31, respectively.
1, the pawl shaft 311 rotates clockwise due to the tensile force of the tension spring 326 (Fig. 11), and the plate head gripping pawl 312 (No. 10)
Figure b) performs the "open" operation. When the plate cylinder 3 further rotates, the lock lever 159 is kicked up by the roller 320 and the plate supply/discharge cam 15 is rotated as described above.
7 is unlocked.

Plate Head Holding Vise Mechanism and Vise Release Mechanism On the outer surface side of the left side 310 of the plate cylinder 3, there are shown in FIG. 10a, FIG. 11a, FIG.
As shown in FIG. 7, in addition to the above-mentioned plate head gripper opening/closing mechanism, a plate head gripper vise mechanism and a vise release mechanism are provided. Among these, the plate head gripping vise mechanism is constructed as follows. That is, as shown in FIG. 16, a link 327 is rotatably attached to the left side 310 of the plate cylinder 3 via a shaft 328.
Rollers 329 and 330 are attached to the center and tip positions of this link 327, respectively. Further, another link 331 is rotatably attached to the left side portion 310 via a shaft 332.
The link 32 is inserted into the elongated hole 331a formed in the
7 rollers 330 are slidably engaged.
Further, another link 334 is rotatably connected to the tip of the link 331 via a pin 333, and the other end of this link 334 and the tip of the link 321 are rotatably connected via another pin 335. A stopper 336 protruding from the left side 310 of the plate cylinder 3 is provided at an inward position of the link 331 to restrict clockwise rotation of the link 331. Further, between the left side portion 310 and the link 327, the plate cylinder 3
A tension spring 337 is tensioned to relieve the centrifugal force acting on the link 327 as the link 327 rotates. Furthermore, a link 3 is provided at a predetermined position on the printing press main body 1 side.
A plate head gripper lock cam 162 for pushing the rollers 329 of No. 27 inwardly into the plate cylinder 3 is fixedly provided.

The operation of this plate head gripping claw vise mechanism is as follows. That is, as shown in FIG. 16, immediately after the roller 320 of the link 322 fits into the recess 157c of the plate feeding/discharging cam 157, the plate head gripping claw 312 closes and the plate head grip is performed. The roller 329 of the link 327 is pressed against the plate head gripper lock cam 162, and the link 327 rotates clockwise about the shaft 328 as a fulcrum.
When the link 327 rotates clockwise, the roller 330 of the link 327 slides within the elongated hole 331a of the link 331, causing the link 331 to rotate clockwise about the shaft 332. In this way, when the pin 333 moves from the position shown in FIG. 16 to the straight line connecting the pin 335 and the shaft 332, that position is taken as the top dead center.
The claw shaft 311 is strongly rotated to the right via the link 321, and a strong pressing force is applied to the plate head gripping claw 312. Further, the link 331 rotates clockwise, and the 17th
As shown in the figure, when the pin 333 moves to a position slightly beyond the above-mentioned top dead center, the link 331 is engaged with the stopper 336 and becomes self-locked. Pressing force is continuously applied.

On the other hand, the vise release mechanism for releasing the lock of the plate head gripping claw vise mechanism is constructed as follows. That is, as shown in FIGS. 10a and 11a, the approximate center of the link 338 is connected to the shaft 339.
(The roller 32 attached to the tip of the link 322
The link 338 is rotatably connected to the tip of the link 322 via a shaft (which also serves as the rotation shaft of No. 4), and rollers 341 and 342 are attached to one end and the other end of the link 338.

The action of this vise release mechanism is as follows. In other words, with the vise mechanism locked,
When the plate cylinder 3 rotates to the position shown in FIG.
As shown in Figure a, the roller 341 of the link 338 runs over. This causes the link 338 to
The roller 342 attached to the end of the link 338 presses the link 334 toward the outer circumference of the plate cylinder. When the link 334 is pressed, the link 334 rotates clockwise about the pin 335, and at the same time, the link 331 rotates counterclockwise about the shaft 332. As a result, the pin 335 and the shaft 33
When the pin 333 passes through the straight line connecting the two (ie, the top dead center), the vise mechanism is unlocked, and the link 321 can rotate to the left about the claw shaft 311.

Plate head extrusion mechanism A plate head extrusion mechanism is provided in the plate cylinder 3, as shown in FIGS. 9a, 12, 13, and 14. This plate head extrusion mechanism is constructed as follows. That is, the left and right side parts 310, 3 of the plate cylinder 3
One end of a link 343 is fixed to a shaft 342 rotatably spanned between 10, and a long hole 344b of the link 344 has a plate extrusion claw 344a at the tip.
A shaft 346 fixed in the plate cylinder 3 is slidably engaged, and the rear end of this link 344 and the tip of the link 343 are rotatably connected by a shaft 345. A plurality of these links 343 and 344 are arranged along the direction of the rotation axis of the plate cylinder 3 in correspondence with each plate head positioning pin 315, and each of the links 343 and 344
2, the link 344 advances and retreats via the link 343, and the plate pushing claw 344a moves into the plate cylinder 3.
It is configured to move ``out'' and ``in'' from the opening end surface. The left end of the shaft 342 is connected to the left side 31 of the plate cylinder 3.
0, and a gear 3 is attached to the extended end.
A link 347 having a gear 347a is fixed, and another link 348 having a gear 348a meshing with the gear 347a is rotatably connected to a shaft 349 protruding from the outside of the left side 310 of the plate cylinder 3. A cam follower 350 is attached to the tip of this link 348. Further, a tension spring 351 is tensioned between the tip of the link 347 and the left side portion 310, and the shaft 342 is biased to rotate in the counterclockwise direction in FIG.
In other words, the plate push-out claw 344a is rotationally biased so as to perform an "in" operation. On the other hand, the cam follower 35
The plate discharge cam 163 corresponding to 0 is the plate supply and discharge cam 15
The shaft 15 is fixed to a shaft 158 that also serves as the rotation shaft of the shaft 15, and is connected to the shaft 158 which also serves as the rotation shaft of the shaft 15.
It is configured to rotate in forward and reverse directions within a predetermined range around 8.

The operation of this plate head extrusion mechanism is as follows.
That is, after the plate discharge cam 163 is locked at the position shown in FIG.
The cam follower 350 rides on a, link 3
48 rotates to the left about axis 349. link 34
8 rotates to the left, as shown in FIG.
rotates clockwise about shaft 342 against the biasing force of spring 351. Due to this clockwise rotation, the link 343 also rotates clockwise, and the plate ejecting claw 3 of the link 344
44a performs an "out" operation. In this case, Figure 12b
As shown in FIG.
If the printing head 50a' of 0' is held in advance, the first
As shown in FIG. 3B, the plate head 50a' is pushed out from the plate head positioning pin 315 by the plate pushing claw 344a. Furthermore, when the plate cylinder 3 rotates and the cam follower 350 moves past the first cam surface 163a of the plate discharge cam 163 to the second cam surface 163b as shown in 14a, the biasing force of the tension spring 351 The link 348 is connected to the shaft 349 by
This causes the links 347 and 343 to rotate to the left, causing the plate push-out claw 344a to enter.

Plate Feeding Presser Roller Cam Mechanism A plate feeding presser roller cam mechanism is provided on the right side 310 of the plate cylinder 3, as shown in FIG. This plate feeding presser roller cam mechanism is constructed as follows. That is, within the plate cylinder 3, the claw shaft 311
A gear 352 is fixed to a position near the right end of the fulcrum shaft 354, which has a small gear 353 fixed to one end that meshes with the gear 352, is rotatably attached to the right side 310, and is linked to the other end of the fulcrum shaft 354. 3
55 is fixed. On the other hand, plate feeding presser roller cam 3
56 is rotatably attached to the right side part 310 via a fulcrum pin 357, and this plate feeding presser roller cam 3
The link 355 is inserted into the elongated hole 356a formed in the
A pin 358 attached to the tip of is slidably engaged.

The operation of this plate feeding presser roller cam mechanism is as follows. That is, when the plate head gripping pawl 312 operates to "open" in the manner described above, the gear 352 fixed to the pawl shaft 311 rotates clockwise in FIG. do,
Link 355 also rotates to the left. link 355
When rotates to the left, a pin 358 provided at the tip of the link 355 slides within the elongated hole 356a of the plate feed presser roller cam 356, causing the plate feed presser roller cam 356 to rotate clockwise about the fulcrum pin 357. As a result, the plate feeding presser roller cam 356 is set at a predetermined position. Similarly, the head gripping nail 3
12 performs the "close" operation, the reverse operation to the above is performed, and the plate feeding presser roller cam 356 returns to its original position and is reset.

Attachment/separation operation of the plate feed press roller The plate feed press roller 525 provided in the plate supply/discharge unit 5 is attached/separated from the plate cylinder 3 in the following manner. That is, as shown in FIG. 18d, after the plate feeding presser roller cam 356 is set, while the plate head gripping claw 312 is open, the plate feeding presser actuating roller 530 moves the plate feeding presser roller cam 35.
It gets to 6. As a result, as shown in FIG. 19a, the plate feeding press operating arm 531 and the rotating shaft
4 rotates to the left, the roller support arm 526 similarly rotates to the left, and the plate feeding press roller 525 is set at the plate press position. This setting operation is performed when the plate feeding press roller 525 is located at the opening 307 of the plate cylinder 3. At the same time, as the rotary shaft 524 rotates to the left, the ratchet wheel 529 shown in FIG. The roller 525 is locked in the plate holding position. Next, the plate head gripping claw 312 moves to "close" to perform plate head gripping, and as the plate feed press roller 525 passes through the opening 307 as the plate cylinder 3 rotates, the plate feed press roller 525 closes the plate cylinder 3. Climb onto the outer periphery of the
Start pressing the plate 50 against the plate cylinder 3. In this case, the roller support arm 526 is
Since the plate 50 is urged to rotate counterclockwise by the torsion coil spring 527, the plate 50 is rotated by the plate feeding presser roller 5.
25, it is elastically pressed against the plate cylinder 3. In this way, as the plate cylinder 3 rotates, the plate 50 is pressed against the plate cylinder 3 by the plate feeding press roller 525 and wound without slack.

On the other hand, as shown in FIG. 20b, a lock release cam 306 is fixed on the outer circumference of the plate cylinder 3 in correspondence with the lock release roller 537. rides on the lock release cam 306. As a result, the ratchet 5 provided integrally with the lock release arm 533
34 rotates clockwise around the shaft 535, and the ratchet 5
The tip of 34 is the valley part 52 of the ratchet foil 529.
It falls outside of 9a. Ratchet 534 is Tanibe 529
Once removed from a, the ratchet foil 529 is attached to the shaft 524 and the arm 5, as shown in FIG. 20a.
Since the arm 5 is urged to rotate in the clockwise direction by the spring 532 via the stopper 543
Rotate clockwise until you hit 31. When the shaft 524 rotates clockwise, the roller support arm 526 also rotates clockwise, and the plate feeding press roller 525 separates from the plate cylinder 3.

Plate Bottom Foot Reset Cam Mechanism A plate bottom foot reset cam mechanism shown in FIG. 21 is provided on the right side plate 102 of the printing press body 1.
This plate bottom reset cam mechanism is located at the right side plate 10.
A link 165 and a plate bottom foot reset cam 166 are respectively fixed to the outer and inner ends of a shaft 164 which is rotatably attached so as to penetrate through the plate 2 (not shown). Also, link 165 and lever 1
34 (already explained using FIG. 7), a spring 167 is stretched between the link 165 and the right side plate 1.
Between the spring stops 168 fixed to the outer surface of 02,
Another spring 169 is tensioned.

The operation of this plate bottom foot reset cam mechanism is as follows. That is, when the solenoid 137 is turned on, the lever 134 rotates clockwise about the shaft 133. As a result, the link 165 rotates counterclockwise around the shaft 164 via the spring 167, and the plate end foot reset cam 16 fixed to the shaft 164 is rotated to the left.
6 similarly rotates to the left, and is prevented from rotating by being engaged with a stopper 170 (protruding from the inner surface of the right side plate 102 of the printing press body 1) (FIG. 22). This "set" state of the plate bottom foot reset cam 166 is maintained while the solenoid 137 is on. When solenoid 137 is turned off, the exact opposite operation is performed. That is, the suction force of the solenoid 137 is released, the lever 134 and the link 165 are rotated in the opposite direction to the above due to the tensile force of the spring 169, and the plate bottom reset cam 1 is rotated.
66 rotates back to its original position ("reset" state).

22 to 25 on the right side 310 of the plate cylinder 3.
A plate bottom hook actuation mechanism as shown in the figure is provided. This plate bottom hook operating mechanism is constructed as follows. That is, as shown in FIGS. 22 and 23,
A link 359 is rotatably attached to the outer surface of the right side 310 of the plate cylinder 3 via a shaft 360. This link 359 has a cam follower 361 on its outer surface.
is attached, a pin 362 is provided protruding from the inner surface as shown in FIG.
The link 359 is urged to rotate clockwise about the shaft 360. Also, the other link 364 is connected to the axis 3
65, it is rotatably attached to the outer surface side of the right side portion 310. At one end of this link 364,
A roller 366 having a roller shaft end that is rotatably engaged with the inner end surface 359a of the link 359 is attached, and a tension spring 367 is tensioned between the other end of the link 364 and the right side 310, so that the link 364 is attached to the shaft 36.
5 as a fulcrum and is urged to rotate clockwise. This link 364 connects the shaft end of the roller 366 to the link 359 in the clockwise rotation position shown in FIG.
By locking the spring 3 in the recess 359b of the
63, the link 359 is held in a position rotated counterclockwise by a predetermined angle about the shaft 360 (that is, the link 359 is locked).

On the other hand, a plate end footset cam 171 for releasing the locked state of the link 359 is attached to the printing press main body 1 side in correspondence with the link 364. This version butt set cam 171 is the 24th
As shown in the figure, it is rotatably attached to the tip of a cam attachment member 172 protruding from the inner surface of the right side plate 102 of the printing press body 1 via a horizontal shaft 173, and is rotated clockwise by a spring 174. The stopper portion 172 of the cam mounting member 172 is rotated by
Rotation is regulated at a position where the horizontal attitude is maintained by a. This version butt set cam 171 is the second
When the link 359 shown in Fig. 3 is in the locked state, the plate cylinder 3
When it rotates clockwise, it engages with the link 364, causing the link 364 to rotate counterclockwise about the shaft 365, thereby unlocking the link 359. Note that when the plate cylinder 3 is manually reversely rotated during maintenance and inspection, the cam 171 and the link 364 engage with each other. Since the link 364 and the cam 171 are rotated counterclockwise around the horizontal axis 173 to escape, damage to the link 364 and the cam 171 is avoided.

On the other hand, as described above, the hook shaft 316 shown in FIG. 25 fixes the plate bottom hook 317 and is urged to rotate counterclockwise by a torsion coil spring 318, and a link fixed to the right end of the hook shaft 316 fixes the plate bottom hook 317. 319
is engaged with a pin 362 protruding from the link 359.

The operation of this plate bottom hook operating mechanism is as follows. That is, as shown in FIG. 22, after the plate bottom foot reset cam 166 is "set" by the method described above, the link 359, which is in the unlocked state as shown by the solid line in the figure, is moved to the right side of the plate cylinder 3. When it rotates to the position of the plate bottom foot reset cam 166, the cam follower 361 of the link 359 rides on the plate bottom foot reset cam 166, and the link 359 resists the tensile force of the spring 363 and moves to the shaft 36.
Rotate counterclockwise around 0 to the position shown by the imaginary line in the figure. When link 359 rotates to the left, link 364
is rotated clockwise by the tensile force of the spring 367 with the shaft 365 as the fulcrum, and the fulcrum shaft end of the roller 366 is the fulcrum of the link 3.
59, and the link 359 is locked in the position shown by the imaginary line in FIG. In this way, when the link 359 rotates to the left by a predetermined angle, the pin 362 protruding from the link 359 moves to the left and is engaged with the pin 362 as shown in FIG. link 319
However, the hook shaft 31 resists the biasing force of the spring 318.
Rotate clockwise using 6 as a fulcrum. As a result, the hook shaft 3
The plate bottom hook 317 fixed to the plate 16 also rotates clockwise together with the hook shaft 316. In this case, the 26th
As shown in the figure and FIG. 27, the plate 5 is mounted on the plate cylinder 3.
0' is attached, clockwise rotation of the plate bottom hook 317 causes the plate bottom hook 317 to come off the plate bottom hole 50b', and the plate bottom grip is released.

Furthermore, when the plate cylinder 3 continues to rotate and reaches the rotational position shown in FIG. 23, the roller 366 of the link 364
hits the bottom set cam 171, link 3
64 rotates to the left around axis 365. As a result, the shaft end of the roller 366 is connected to the recess 3 of the link 359.
59b and due to the biasing force of the spring 363,
Link 359 rotates clockwise about axis 360. When the link 359 rotates clockwise, the engagement between the link 319 and the pin 362 is released, as shown in FIG.
The plate bottom hook 317 receives the urging force of the spring 318 and rotates to the left. This counterclockwise rotation is performed while the plate feeding press roller 525 is in the "applied" operation, as shown by the imaginary line in FIG. 25a. Therefore, when a new plate 50 is being fed, the plate bottom hook 317 is rotated to the left while the plate bottom 50c is pushed into the opening 307 of the plate cylinder 3 by the plate feeding presser roller 525. As a result, the plate bottom hook 317 hooks into the plate bottom hole 50b, and holds the plate bottom 50c by pulling it in a direction substantially tangential to the outer peripheral surface of the plate cylinder.

FIG. 29 shows a sectional view of the plate cylinder 3. As shown in the figure, the corner of the plate cylinder 3 between the opening end face and the outer peripheral surface of the plate cylinder is rounded. That is, on the plate head holding side, the plate head pressure contact surface 36
9 is formed as a plane perpendicular to an imaginary line 371 connecting the center of the opening 307 and the plate cylinder center 370, and the corner portion between the plate head pressure contact surface 369 and the plate cylinder outer circumferential surface 372 has a smooth surface with a radius of R ₁ . It is finished with a curved surface. In addition, on the plate bottom gripping side, the opening end surface 373 is formed as a plane perpendicular to the virtual line 371, and the corner portion between the opening end surface 373 and the plate cylinder outer circumferential surface 372 is formed into a smooth curved surface with a radius R ₂ . It is finished. If such a rounded finish is applied, the printing head 50a will become the printing plate gripping claw 312.
After being held in pressure contact with the plate head pressure contact surface 369, as the plate 50 is wrapped around the plate cylinder outer circumferential surface 372 while being pressed by the plate feeding press roller 525 (FIG. 6), the plate 50 is held in pressure contact with the plate head pressure contact surface 369. This means that it can be wrapped tightly without leaving any gaps between the two. In addition, the plate bottom 5 is set by the plate bottom hook 317.
Even when the plate end 50c is held so as to be tensilely biased toward the inside of the plate cylinder opening, the plate tail 50c can be fitted to the outer periphery of the plate cylinder to complete the winding. In this way, it becomes possible to wrap the plate 50 at a predetermined position on the plate cylinder 3 with high accuracy. In addition, in this example,
As an example of the dimensions of the radii R ₁ and R ₂ above, the radius
R ₁ and R ₂ are both 15 mm for 76.5 mm plate cylinder 3.
It is set to .

(4) Plate manufacturing procedure and its structure Next, before explaining the automatic plate feeding and discharging operation,
The plate 50 used in the above printing machine will be explained. This plate 50 is manufactured by the procedure shown in FIG. That is, as shown in FIG. 1A, first, an original plate 51 in which a photosensitive resin layer is laminated on a polyester film base is accurately cut into a predetermined size using a cutter. Next, as shown in FIG. 9b, a plate head hole 50d is formed at the plate head position of the original plate 51 corresponding to the positioning pin 315 shown in FIG. A plate bottom hole 50b is formed corresponding to the plate bottom hook 317 shown in the figure. In this case, the formation positions of the plate head hole 50d and plate bottom hole 50b are on each side of the original plate 51, that is, both side sides 51a, plate bottom side 51b, and plate head side 51c.
is established as a standard.

On the other hand, a printing pattern 5 is printed on the original film 52 shown in FIG.
3 and a registration mark 54 are drawn. Further, the original film 52 is
A positioning hole 55 corresponding to the plate head hole 50d is formed at the plate head position. In this case, the center positioning hole 55 is set to a perfect circle with the same dimensions as the plate head hole 50d, and the positioning holes 55 at both ends are set to the original film 52.
It is formed into an elongated hole with its long axis set in the left-right direction in consideration of thermal expansion.

Next, the original film 52 is superimposed on the original plate 51 by passing positioning pins (not shown) through the positioning hole 55 and the plate head hole 50d, and with the plate thus positioned, an exposure process (e in the figure) is performed to form the printed pattern 53. is printed on a predetermined position on the original plate 51. Once the printing is completed, a phenomenon treatment (f in the same figure) is subsequently performed to complete the plate 50 as a final product.

(5) Plate loading/unloading operation Next, the plate loading/unloading operation during plate replacement will be explained. FIG. 31 shows how the microprocessor 21 (second
2 is a flowchart showing the operation of FIG.

When a plate exchange command is given, it is determined in step S30 whether or not the command can be accepted. If the command cannot be accepted, the operation is terminated, and if the command can be accepted, the process proceeds to the next step S31.

In step S31, the supply/discharge tray 9,
The set state of the plate above 10 is determined. In this case, the plates are specifically set as follows. That is, in FIG. 6, the plate head 50d of the plate 50 to be newly printed (hereinafter referred to as a new plate) is slightly inserted between the plate feed drive roller 510 and the plate feed auxiliary drive roller 520 (at this point, the plate head 50d is inserted between the plate feed drive roller 510 and the plate feed auxiliary drive roller 520). are separated from the rollers 510), both sides of the new plate 50 are positioned along the positioning members 904 on both sides of the plate supply/discharge tray 9 (or 10) shown in FIG. Position the tray 9 (or 10) along the plate bottom positioning material 903. Also,
The determination as to whether or not a new plate 50 has been set is made using a plate presence detection sensor 544 attached to the plate supply/discharge unit 5 (or 6) shown in FIG.

In this way, in step S31, the new edition 50
The setting status of the trays 9 and 10 is determined.
If the new plate 50 is set in both of the printing plates (that is, in the case of two-color printing), it is confirmed in step S32 that the inking units 7 and 8 are both set, and then the process advances to step S33 to print the printing plate. For example, the type is set to the state "3" and stored in the memory. In addition, in step S31, the new plate 50 is placed only in the upper tray 9.
is set (that is, in the case of one-color printing), after confirming in step S34 that the upper inking unit 7 is set, the process proceeds to step S35, where the hand type is set to, for example, "1". The state is set and stored in memory. Further, in step S31, if the new plate 50 is set only on the lower plate supply/discharge tray 10 (that is, in the case of one-color printing), it is determined that the lower inking unit 8 is set in step S36. After confirming this, the process proceeds to step S37, where the hand type is set to the state "2", for example, and stored in the memory. Furthermore, in step S31, if the new plate 50 is not set on any of the plate supply/discharge trays 9, 10 (that is, in the case of plate discharge operation), the process proceeds to step S38, where the hand type is set to the "0" state, for example. set and store it in memory. Incidentally, in steps S32, S34, and S36, if the predetermined inking unit 7 or 8 is not installed, the process proceeds to step S39, where an error message is displayed, and then the operation is terminated.

In this way, steps S33, S35, S37,
When the hand type setting is completed in S38, the process proceeds to step S40, where mechanical initialization is performed. As a result, the plate cylinders 3, 4 and the impression cylinder 11 are separated from the blanket cylinder 2, and the inking units 7, 8 are set at a position where they are separated from the plate cylinders 3, 4.

Next, in step S41, the low-speed motor is turned on and the high-speed motor is turned off, and the ink forming rollers of the blanket cylinder 2, impression cylinder 11, plate cylinders 3 and 4, and inking units 7 and 8 are set to normal printing conditions. It starts rotating at a slower speed.

Thereafter, in step S42, the state of the hand type stored in the memory is determined. That is, when it is determined that the hand type is "3" (in the case of upper and lower plate feeding), the process advances to step S43, where plate feeding and discharging processing is performed on both plate cylinders 3 and 4. Furthermore, if the hand type is determined to be "1" (in the case of a top-fed plate), the process advances to step S44, where plate feeding and discharging processing is performed on the plate cylinder 3 side, and the plate cylinder
On the other hand, only the plate discharge process is performed. Similarly, if the hand type is determined to be "2" (in the case of a sub-fed plate), the process advances to step S45, where plate feeding and discharging processing is performed on the plate cylinder 4 side, and plate discharging processing is performed on the plate cylinder 3 side. Only processing takes place. In addition, if the hand type is determined to be "0" (in the case of only ejection),
Proceeding to step S46, only plate discharge processing is performed on both plate cylinders 3 and 4. The only difference between the plate feeding and discharging process and the plate discharging process in this case is whether or not the plate feeding drive roller 510 and plate feeding auxiliary drive roller 520 shown in FIG. 7 are rotationally driven by the pulse motor 509 (FIG. 3 d). be. That is, when performing the plate supply/discharge process, the pulse motor 509 is driven at a predetermined timing to feed the plate, and when only the plate discharge process is performed, the pulse motor 509 is not driven at all (that is, the plate is not fed).

After completing the predetermined plate feeding and discharging processes in steps S43 to S46, the process proceeds to step S47, where the low speed motor is turned off and the high speed motor is turned on, and the blanket cylinder 2, impression cylinder 11, plate cylinders 3 and 4, and plate cylinders 3 and 4 are moved. The ink forming rollers of the king units 7 and 8 are switched from low speed rotation to high speed rotation.
In this way, the series of plate exchange processing is completed.

The above is the operation of the microprocessor 21 (Fig. 2) when a plate exchange command is given.Next, the plate supply/discharge operation including each mechanism will be explained using the time chart shown in Fig. 28. explain. However, here, a new plate 50 is set on the plate feeding base 901 of the plate supply/discharge tray 9, and a printed plate 50 is placed on the plate cylinder 3 side.
0' (hereinafter referred to as the old plate) is wound (that is, the plate feeding/discharging operation is performed on the plate cylinder 3 side) as an example. In other cases, the predetermined plate feeding and discharging operations are performed according to the same principle as described above, and therefore the explanation thereof will be omitted.

First, when a plate exchange command is given and the plate cylinder 3 starts rotating, a plate discharge drive roller 511 shown in FIG. 7 connected to the plate cylinder gear 301 through a gear mechanism
begins to rotate at a constant speed in the counterclockwise direction in the figure.
This plate discharge drive roller 511 continues to rotate while the plate supply and discharge operation is being performed.

Then, at time _t1 , when the rotational position of the plate cylinder 3 reaches a predetermined position, the solenoid 150 is turned on and the set lever 153 is turned on, as shown in FIG.
rotates to the left around the shaft 151, and the supply/discharge plate cam 157
Then, the plate discharge cam 163 (FIG. 12) rotates to the left and is locked by the lock lever 159.

Then, when time t ₂ is reached, the solenoid 1
50 is turned off, but the supply/discharge plate cam 157 (10th
) is still locked by the lock lever 159, so the plate feeding/discharging cam 157 and the plate discharging cam 1
63 (FIG. 12) is held in the above rotational position.

When the plate cylinder 3 further rotates and reaches time _t3 , the roller 34 of the link 338 is rotated as shown in FIG.
1 rides on the supply/discharge plate cam 157, and the link 33
8 rotates clockwise around the shaft 339, and the roller 342 pushes out the link 334 toward the outer circumference of the plate cylinder.
The lock of the vise mechanism is released. This allows the claw shaft 311 to rotate to the left.

When time t ₄ is reached, solenoid 1 shown in FIG.
46 turns on. When the solenoid 146 is turned on, the drive lever 140 rotates to the left about the drive shaft 142, the operating lever 521 rotates to the right about the drive shaft 518, and the plate feeding auxiliary drive roller 520 is pressed against the plate feeding drive roller 510. Ru. As a result, the leading edge of the new plate 50 is nipped by both rollers 510 and 520. Meanwhile, the solenoid 137 shown in FIG. 7 is turned on. This solenoid 13
7 is turned on, the drive lever 131 moves to the drive shaft 13.
3 as a fulcrum, and the operating lever 541 rotates counterclockwise as a fulcrum on the rotating shaft 538, and the discharge plate pressing roller 53
9 is set in a position where it comes into pressure contact with the plate cylinder 3. This "applying" operation of the discharge plate pressing roller 539 is performed when the discharge plate pressing roller 539 is located at the opening 307 of the plate cylinder 3. In addition, the solenoid 137
When turned on, the link 165 and shaft 164 shown in FIG. 21 are rotated to the left, and the plate end foot reset cam 166 is set to the position shown in FIG. 22.

When time t ₅ is reached, link 3 shown in FIG.
22 roller 320 rides on the supply/discharge plate cam 157, and as shown in FIGS. 14b and 14c, the link 32
1 rotates counterclockwise together with the nail shaft 311 to hold the plate head and the nail 3
12 will be opened. Furthermore, as the pawl shaft 311 rotates to the left, the link 355 shown in FIG. 18 rotates to the left as shown in FIG.

Then, when time _t6 is reached, the plate discharge presser roller 539 closes the opening 30, as shown in FIG.
The plate head 50 of the old plate 50' that passes through the plate cylinder 3 and is wrapped around the plate cylinder 3.
a' is nipped by the discharge plate pressing roller 539 and the plate cylinder 3. On the other hand, as shown in Figure 12a,
The cam follower 350 rides on the plate discharge cam 163, and as the plate cylinder 3 rotates, the plate head pushing pawl 344a moves out as shown in FIG. 13, and the old plate 5 is removed.
The plate head 50a' of 0' is pushed out from the plate head positioning pin 315 (time _t7 ). As a result, the old version 5
The 0' printing head grip is released. When the time _t8 is reached, the cam follower 35 is activated as shown in FIG. 14a.
0 moves to the second cam surface 163b of the plate ejecting cam 163, the plate pushing claw 344a enters and returns to its original position. On the other hand, the top 50a' of the old edition 50' is
As shown in FIG. 14b, the plate is sent out between the plate discharge guide 517 and the plate discharge drive roller 511. In this way, the plate head 50a' of the old plate 50' is aligned with the plate ejection guide 517.
After passing between the plate discharge drive roller 511 and the plate discharge drive roller 511, the seventh
The plate discharge drive roller 511 shown in the figure sends out the plate to the plate discharge table 902 of the plate supply/discharge tray 9.

When time _t9 is reached, as shown in FIG. 18d,
The plate feeding presser operation roller 530 of the plate feeding/discharging unit 5 rides on the plate feeding presser roller cam 356, and
The plate feeding press roller 525 shown in FIG. The ratchet 534 shown in b is the trough 529 of the ratchet foil 529.
a, and the plate feeding press roller 525 is held (locked) at the plate holding position.

Thereafter, when time _t10 is reached, the pulse motor 509 (FIG. 3d) provided in the supply/discharge plate unit 5 is activated.
As a result, as shown in FIG.
10 and the plate feed auxiliary drive roller 520 are driven to rotate, and the new plate 50 nipped by both rollers 510 and 520 starts plate feeding, and the plate head 50a is positioned between the plate head gripping claw 312 and the plate head positioning pin 315. It is delivered to the insertion space 368. When the plate head 50a is sent out to a predetermined position within the plate insertion space 368 in this way, the link 32
2 roller 320 is connected to the concave portion 1 of the feeding/discharging plate cam 157.
57c, the plate head gripping pawl 312 begins to close (time _t11 ), and after the positioning pin 315 is inserted into the pin hole provided in the plate head 50a, the plate head gripping pawl 312 moves the plate head 50a into the plate cylinder. 3 (time t ₁₂ ). In this case, the above-mentioned version 5
The method of controlling the feed speed of 0a will be explained in detail later.

While the printing process is being carried out in this way, the first
As shown in FIG. 8, as the pawl shaft 311 rotates, the plate feeding presser roller cam 356 returns from the set state shown in FIG. 8D to the reset state shown in FIG. 8C.

Immediately after gripping the plate head, as shown in FIG. 19a, the plate feeding press roller 525
passes through the opening 307 and rides on the plate cylinder 3,
The pressing of the new plate 50 onto the plate cylinder 3 is started.

Thereafter, at time _t13 , the pulse motor 50
9 is turned off, and both rollers 510, 520 (Fig. 6)
The sending out of the new version 50 will be stopped. Thereafter, as shown in FIG. 6, the new plate 50 is pulled out from the supply/discharge table 901 by the rotational force of the plate cylinder 3 while being nipped by both rollers 510 and 520, and transferred to the plate cylinder 3 by the plate supply presser roller 525. The plate is wound around the plate cylinder 3 while being pressed against it to prevent it from sagging. On the other hand, the lock lever 159 shown in FIG. 16 is lifted up by the roller 320 of the link 322, and the plate feeding/discharging cam 157 and the plate discharging cam 163 (FIG. 12a) are unlocked.

Then, when time _t14 is reached, the plate head clamping vise mechanism is locked. That is, as shown in FIG.
The roller 329 of No. 27 is pressed, and the link 327 rotates clockwise about the shaft 328 as shown in FIG. As a result, the link 331 rotates clockwise around the shaft 332, and the pin 333 passes the top dead center and the shaft 333
The plate cylinder 3 is self-locked at a position moved inward of the plate cylinder 3 by a slight distance from the straight line connecting the plate cylinder 2 and the pin 335. In this self-locked state, the link 32
1 is strongly rotated to the right together with the pawl shaft 311, applying a strong pressing force to the plate head gripping pawl 312, and pressing the plate head 50.
a is firmly pressed and held.

When time t ₁₅ is reached, the grip on the plate end of the old plate 50' is released. That is, the roller 3 of the link 359 is connected to the plate bottom reset cam 166 shown in FIG.
61 rides on it, the link 359 rotates to the left around the shaft 360, and the link 364 rotates to the right around the shaft 365 due to the biasing force of the spring 367.
59 in its counterclockwise rotation position. link 35
9 is rotated to the left, the link 319 shown in FIG.
is pushed by the pin 362 of the link 359 and rotates clockwise together with the hook shaft 316, and the plate bottom hook 317 also rotates clockwise, causing the plate bottom hook 317 to come off the plate bottom hole 50b' of the old plate 50'. The plate bottom grip is released.

In this way, the time t ₁₆ is reached, and the old version 5 shown in FIG.
When the plate end 50d' of 0' passes the discharge plate pressing roller 539, the solenoid 137 is turned off. By turning off the solenoid 137, the drive lever 131 rotates to the left around the drive shaft 133, and the actuating lever 541 rotates to the left.
is rotated clockwise about the rotating shaft 538 by the biasing force of the return spring, and the plate discharge pressing roller 539 is separated from the plate cylinder 3. Thereafter, the old plate 50' is stored in the plate discharge table 902 while being fed by the plate discharge drive roller 511, and the plate discharge operation of the old plate 50' is completed. On the other hand, by turning off the solenoid 137, the 21st
The link 165 and shaft 164 shown in the figure are connected to the spring 16
The plate bottom foot reset cam 166 also rotates clockwise and returns to the reset position.

Thereafter, when the tail end of the new plate 50 is completely pulled out from the plate feeding table 901, the plate presence detection sensor 544
(FIG. 7), the presence or absence of the new version 50 is detected again. At this time, if the plate head gripping claw 312 is normally holding the print head, the new plate 50
The new plate 50 is not detected because the drawing from the plate feeding table 901 has already been completed, and in this case, the plate feeding/discharging operation continues. On the other hand, when the plate head gripping claw 312 makes a mistake in gripping the plate head, the new plate 50 remains on the plate feeding table 901, so that the new plate 50 is detected by the plate presence detection sensor 544. In that case, the main motor 20 (FIG. 1) is controlled to immediately come to an emergency stop based on a command from the microprocessor 21 (FIG. 2).

If the plate feeding/discharging operation is continued, the plate bottom of the new plate 50 is grabbed at a subsequent time _t17 . That is, as shown in FIG. 25a, when the plate feeding press roller 525 passes the outer periphery of the plate cylinder 3, it enters the opening 307 due to the biasing force of the spring 527 (FIG. 19), and at this time, the new plate 50 's version bottom 50
c into the circumference of the plate cylinder 3. On the other hand, in synchronization with the timing of the above-mentioned pushing, the plate bottom foot set cam 171 shown in FIG. 23 engages with the roller 366 of the link 364. This engagement causes link 3
64 rotates counterclockwise around axis 365 and links 359
is unlocked and the link 359 is released by the spring 36.
It rotates clockwise around axis 360 due to the tensile force of 3.
When the link 359 rotates clockwise, the engagement between the link 319 and the pin 362 shown in FIG. 317 also rotates to the left. The operation from the engagement of the plate bottom hook set cam 171 to the counterclockwise rotation of the plate bottom hook 317 is performed in an instant, and as a result, the plate bottom hook 317 is caught in the plate bottom hole 50b of the new plate 50, and the plate bottom hook 317 is caught in the plate bottom hole 50b of the new plate 50. is tensilely biased in a substantially tangential direction to the outer circumferential surface of the plate cylinder to grip the plate bottom.

Immediately after the new plate 50 is wound around the plate cylinder 3, at time _t18 , the plate feeding press roller 525 is raised. That is,
As shown in FIG. 20b, the lock release cam 306
The lock release roller 537 is kicked up, the tip of the latch 534 is removed from the trough 529a of the latch wheel 529, and the rotating shaft 524 rotates clockwise under the tension of the spring 532 shown in FIG. The roller 525 is operated away from the plate cylinder 3.

Thereafter, when time _t19 is reached, the solenoid 146 shown in FIG. 6 is turned off. As a result, spring 1
The drive lever 140 is moved to the drive shaft 142 by the biasing force of 44.
The operating lever 521 rotates counterclockwise around the drive shaft 518 due to the biasing force of the return spring, and the plate feeding auxiliary drive roller 520 rotates clockwise around the plate feeding drive roller 510.
move away from As a result, all plate feeding operations for the new plate 50 are completed.

(6) Effects of the above plate supply/discharge control method To summarize the points of this embodiment, the printing press to which this plate supply/discharge control method is applied is a two-color offset printing machine having two plate cylinders 3 and 4. Yes, the plate supply/discharge units 5,
Only when a plate presence detection sensor 544 installed in plate cylinder 6 detects that a plate 50 is set, the pulse motor 509 of the corresponding plate supply/discharge unit 5 or 6 is activated to move the plate 50 to plate cylinder 3 or plate cylinder 3. 4
Send it out to the side (see Figure 31). The plate head 50a of the sent-out plate 50 is held by the plate head gripping claws 312 of the corresponding plate cylinders 3 and 4, and
As the plate cylinders 3 and 4 rotate, the plate cylinders 3 and 4 are pulled out from the plate supply and discharge table 901 of the plate supply and discharge trays 9 and 10.
It gets wrapped around. At this time, if there is a mistake in holding the plate head, the plate 50 will not be wrapped around the plate cylinders 3 and 4 and will remain on the plate feeding table 901, so that the drawing out from the plate feeding table 901 will be completed. When the plate presence detection sensor 544 detects the new plate 50, the main motor 20 is urgently stopped.

In this way, if a mistake occurs in holding the plate head on at least one side of the plate cylinders 3 and 4, the mistake will cause the plate presence detection sensor 5 to
44 and the motor 20 of the machine is immediately stopped, the ink forming roller may stain the plate cylinders 3 and 4 when a mistake in plate winding has occurred, or the plate 50 may It is possible to prevent various inconveniences caused by wrong winding of the plate, such as the plate being caught in the printing machine and causing damage to the plate or failure of the printing machine. Moreover, since the plate presence detection sensor 544 for selecting the plate feeding/discharging operation and the plate discharging operation is used to detect plate wrapping errors, there is no need to separately provide a special sensor for detecting plate wrapping errors, making it easy to use. With this structure, errors in plate wrapping can be detected.

In addition, this control method selects either the plate supply/discharge operation or the plate discharge operation by detecting the presence or absence of the plate 50 on the plate supply/discharge trays 9, 10 using the plate presence detection sensor 544, which simplifies the control. I can figure it out. Furthermore, in the plate feeding and discharging operation, plate feeding and plate discharging operations are performed in parallel while the plate cylinder 3 rotates approximately once, so that the plate changing time can be shortened, and
Since the plate discharge operation precedes, double feeding of plates to the same plate cylinder 3 can be effectively prevented.

In the above embodiment, the plate feeding device for performing the plate feeding operation and the plate discharging device for performing the plate discharging operation are integrated, and the plate feeding and discharging units 5 and 6 and the plate feeding and discharging trays 9 and 10 are integrated. It is mainly composed of. Further, the present invention is widely applicable not only to two-color printing presses but also to multi-color printing presses having three or more plate cylinders.

(Effects of the Invention) As described above, according to the plate feeding and discharging control method for a printing press of the present invention, the presence of a plate is detected for controlling the operations of the plate feeding device and the plate discharging device to detect mistakes in wrapping the plate around each plate cylinder. Since the printer is configured to detect a plate wrapping error using a sensor and immediately stop the printing machine if a plate wrapping error occurs on any of the plate cylinders, a special sensor is installed separately to detect the plate wrapping error. There is no need to provide this, and a plate wrapping error can be detected with a simple structure in a multicolor printing press, and various inconveniences associated with plate wrapping errors can be prevented from occurring.

In addition, the control method selects either operation of only the plate ejecting device or simultaneous operation of the plate ejecting device and the plate feeding device by detecting the presence or absence of a plate on the plate feeding device using a plate presence detection sensor. In combination with the above points, the structure and control can be simplified.

Furthermore, when the plate ejecting device and plate feeding device operate simultaneously to supply and eject plates, the plate ejecting operation and plate feeding operation are performed in parallel with the plate ejecting operation taking precedence, which reduces the plate exchange time and double-feeds the plate cylinder. version can be effectively prevented.

In addition, if there is a time lag between the phases of the plate cylinders, the plate feeding operation will be completed in advance even before the plate feeding operations of all the plate feeding devices are completed. Since the machine motor is stopped when a plate is detected on any of the plate feeding devices, it also has the advantage of being able to take immediate action.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of a printing press that is an embodiment of the present invention, Fig. 2 is a schematic diagram showing a control system used in the printing press, Fig. 3 is a configuration diagram of a plate supply/discharge unit, and Fig. 4 is an explanatory diagram of the plate feeding and discharging plate pressing roller locking mechanism, FIG. 5 is a diagram showing how the plate feeding and discharging unit is attached to the printing press main body, FIG. 6 is an explanatory diagram of the plate feeding operation, FIG. 7 is an explanatory diagram of the plate discharging operation, and FIG. The figure is a configuration diagram of the plate feeding/discharging tray, Figure 9 is a view of the plate cylinder seen from the back side of the printing press body, Figures 10 and 11 are illustrations of the opening and closing operation of the plate head gripper, and Figures 12 to 12 are 14
The figure is an explanatory diagram of the movement in and out of the plate head pushing claw, Figures 15 to 17 are explanatory diagrams of the operation of the plate head gripping vise mechanism, Figure 18 is an explanatory diagram of the operation of the plate feed presser roller cam mechanism, and Figure 19 is an explanatory diagram of the operation of the plate head holding roller cam mechanism. Fig. 20 is an explanatory diagram of the locking operation of the plate holding roller, Fig. 21 is an explanatory diagram of the operation of the plate bottom hook setting cam mechanism, and Figs. 22 to 27 are the plate bottom hook operating mechanism. Fig. 28 is a time chart showing the plate feeding/discharging operation, Fig. 29 is a sectional view of the plate cylinder, Fig. 30 is a diagram showing the plate manufacturing process, Fig. 31
The figure is a flowchart showing the operation of the microprocessor when a plate exchange command is given. 3, 4... plate cylinder, 5, 6... plate supply/discharge unit,
9, 10... plate supply/discharge tray, 50... plate, 509
...Pulse motor, 510...Plate feeding drive roller,
520... plate feeding auxiliary drive roller, 544... plate presence detection sensor.

Claims (1)

[Scope of Claims] 1. A plurality of plate cylinders, a plurality of plate feeding devices and a plate discharging device provided corresponding to each plate cylinder, and a plurality of plates that detect the presence or absence of a plate set in each plate feeding device. A plate supply/discharge control method for a printing press comprising a plate presence detection sensor and a control unit that controls the operation of the plate cylinder, plate feeding device, plate discharge device, and plate presence detection sensor, the method comprising: based on a plate supply/discharge operation command; The presence or absence of a plate on the corresponding plate feeding device is detected by each of the plate presence detection sensors, and if no plate is detected, only the corresponding plate discharge device is operated, and if a plate is detected, the corresponding plate discharge device and plate feeding device are operated. The devices are operated at the same time, and as the plate cylinders rotate, a plate ejecting operation is performed in advance to eject the plate wound around the corresponding plate cylinder, and the plate feeding device is moved to the position of the plate cylinder after the plate ejecting operation has finished. The plate feeding operation of sequentially feeding the plates is performed in parallel, and after plate feeding, the presence or absence of the plate on the corresponding plate feeding device is detected again by the plate presence detection sensor, and the presence or absence of the plate on the corresponding plate feeding device is detected again. A method for controlling plate feeding and discharging of a printing press, characterized in that a motor of the machine is stopped when at least one plate is detected on any one of the plates.