JP3485666B2 - Rotary printing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary printing apparatus in which a base paper made by a plate making section is wound around a plate cylinder and then the plate cylinder is rotated for printing.

[0002]

2. Description of the Related Art As a method of winding a stencil sheet made by a plate making section around a plate cylinder, a feed roller and a discharge roller are rotated together to transfer the stencil sheet to carry out plate making, and the parts made by the plate making are successively wound around the plate cylinder. Method and after fixing the front end of the stencil sheet to the plate cylinder, stop the discharge roller and perform plate making while transferring the stencil sheet by simply rotating the feed roller. There is a method of wrapping around the trunk.

[0003]

In the former case, if the peripheral speeds of the discharge roller of the plate making section and the printing drum are not the same, the base paper during plate making is pulled by the rotation of the plate cylinder and the plate-made image is stretched or There is a risk of damage. In the latter case, the one described in Japanese Patent Application Laid-Open No. 2-82566 is known, but according to this, the direction in which the base paper is loosened is not uniquely determined, and it may sometimes bend upward. It is easily bent and irregularly damaged. Since there is nothing to restrain the slack, there is a problem that when the slack of the base paper is wrapped around the plate cylinder at a stretch, wrinkles are generated or scratched.

In order to solve this problem, when the opening / closing guide plate 82 moves to the storage position, the opening / closing guide plate 82 is forcibly drawn into the storage box 86 by the weight of the opening / closing guide plate 82 due to its own weight. According to the configuration, in the initial stage of the movement, the slackened base paper 83 is suddenly stretched and stretched, but a new problem occurs that the image during plate making is disturbed by the influence of the vibration and extension of the base paper at this time. To do.

It is an object of the present invention to solve the above problems and to provide a rotary printing apparatus capable of improving the print quality of printed matter.

[0006]

In order to achieve the above object, a rotary printing apparatus of the present invention has a plate making means for making a base paper, and a starting end portion of the base paper made by the plate making means. A printing drum for winding the base paper around the cylindrical outer peripheral surface by a predetermined rotation after the base paper is clamped by the clamp means, and a transfer for transferring the base paper made by the plate making means toward the printing drum. and means, provided between the printing and plate-making device drum, most of the base paper
The short transfer route position and the shortest transfer route position intersect with the original paper surface.
Reservoir that separates in the inserting direction and increases the length of the base paper transport path
It is possible to rotate between it and the
A movable guide which rotates by weight, is always a movable guide top
Holding the short transfer path location, beginning of the base paper is imparted a holding means for releasing said holding after being clamped by the plate cylinder side of the movable guide, the movement resistance on the movable guide, its own weight
Buffer means for weakening the moving force of the movable guide that rotates .

Further, as in claim 2, wherein the buffer means, the shortest transport via the shortest transfer path position of the movable guide
The movable guide may be provided with the movement resistance within a movement range up to an intermediate position between the road position and the storage position.

Further, as described in claim 3, the buffer means may be configured to apply the movement resistance to the movable guide through a gear mechanism interlocking with the movable guide.

[0009]

Operation The plate making on the stencil sheet 3 is continuously performed. The stencil sheet 3 has a feeding roller 10 at the thermal head 9 portion.
However, the discharge roller 29 on the plate cylinder 1 side is stopped after the end of the stencil sheet 3 is mounted on the plate cylinder 1. For this reason, the stencil sheet 3 is
In the movable guide 8 portion between 0 and the discharge roller 29, a slack is generated as time passes. The slack is regularly guided into the accumulating chamber 2 without disturbing the image during plate making in the plate making part by the movable guide 8 being released from the holding by the holding means 36 and slowly moving from the standby position. Then, the stencil sheet 3 can be wound and mounted around the outer periphery of the plate cylinder 1 by rotating the plate cylinder 1 by a length corresponding to this slack. At this time, the stencil sheet 3 is moved from the inside of the accumulating chamber 2 to the movable guide 8 according to the rotation amount of the plate cylinder 1.
Since it is pulled out via the, it can be installed stably without wrinkles.

[0010]

EXAMPLES A rotary printing apparatus of the present invention will be described based on examples. FIG. 1 is a side sectional view showing a state in which an upper unit of a plate making section incorporated in the printing apparatus is opened, and FIG. 2 is a side sectional view showing a state in which the upper unit is closed. The plate making section is provided on the side of the printing drum (plate cylinder) 1 of the printing device.
A plate making lower unit 5 having a master chamber 4 for accommodating a storage chamber 2 and a stencil sheet 3 (roll master) wound in a roll shape, and rotatable about a shaft 6 with respect to the plate making lower unit 5. It is composed of the plate making upper unit 7.

The stencil making lower unit 5 performs "writing" stencil making on the stencil sheet 3 described later, and has a platen roller (feeding roller) 10 facing the transfer path of the stencil sheet 3. A thermal head (plate-making means) 9 is provided on the plate-making upper unit 7 side described later, and the stencil sheet 3 is inserted between the platen roller 10 and the platen roller 10. The platen roller 10 is rotationally driven by the writing pulse motor 55 shown in FIG. 3, and the thermal head 9 is drive-controlled to perform “writing” plate making on the stencil sheet 3.

The stencil sheet 3 is transferred to the plate cylinder 1 side by a platen roller 10 facing the thermal head 9, a discharge roller 29 and a driven roller 30. Here, the peripheral speed of the discharge roller 29 is set lower than the peripheral speed of the platen roller 10, and the platen roller 10 and the discharge roller 29 are configured to gradually loosen.
Between the platen roller 10 and the discharge roller 29,
A movable guide 8 for guiding the stencil sheet 3 is provided. The movable guide 8 forms a passage for the stencil sheet 3 by a pair of upper and lower guide portions 8a and 8b. The guide portions 8a and 8b do not have to be plate-shaped and may be comb-shaped.

On the other hand, the plate making upper unit 7 "reads" the original 11. In the plate making upper unit 7,
A document transfer unit and a document reading unit 64 are provided. The reading pulse motor 13 is connected to the document separating roller 21 via gears 14 to 20. Incidentally, as shown in FIG. 5, when the reading pulse motor 13 rotates in the normal direction, the switching means 15 is switched as described later so as to connect them. The document 11 is read by the reading device while being transported by the rotation of the document separating roller 21. A document feeding roller 26 is connected to the reading pulse motor 13 via gears 14 to 18, gears 23 to 25 and a timing belt 50, and the document 11 is discharged. A driven roller 27 is in contact with the document feeding roller 26. The document 11 may be fixed and the reading device may be movable.

FIG. 3 is a side sectional view of the transfer means for the stencil sheet 3 extracted. The write pulse motor 55 shown in the drawing is
The gear 55a rotates the platen roller 10 via the gears 56a, 56b, 10a. At the same time, the discharge roller 29 is rotationally driven by the pulley 56c, the timing belt 57, and the pulley 29b, which are coaxial with the gear 56a.

Clutch means 58 shown in a perspective view of FIG. 4 is provided between the discharge roller 29 and the pulley 29b. The clutch means 58 is composed of an electromagnetic clutch,
The rotational force of the timing belt 57 is transmitted to or cut off from the discharge roller 29 by the drive control of the control means. The clutch means 58 is composed of an electromagnetic solenoid 58a and two clutch plates 58b and 58c. One clutch plate 58b is fixed to the pulley 29b in the rotation direction thereof. The other clutch plate 58c is fixed to the shaft 29a of the discharge roller 29.

When the electromagnetic solenoid 58a is turned on, the clutch plate 58b is attracted to the clutch plate 58c,
Both are integrated. As a result, the driving force of the writing pulse motor 55 is transmitted to the discharge roller 29. When the electromagnetic solenoid 58a is turned off, the clutch plates 58b, 58
Since c is separated, even if the write pulse motor 55 is driven to rotate the timing belt 57, this driving force is not transmitted to the discharge roller 29, and the discharge roller 29 is in a rotatable stop state. The discharge roller 29 is made of an elastic material such as rubber, and the driven roller 30 is made of metal. The surface of the driven roller 30 is roughened so as not to slip.

FIG. 6 is an exploded perspective view showing a switching mechanism provided in the plate making upper unit 7, and FIG. 7 is a plan sectional view of the same.
The switching means 15 applies the rotational driving force of the reading pulse motor 13 to the original separating roller for the original 11 provided in the platemaking upper unit 7 for each rotation direction of the reading pulse motor 13 which is rotatable in both forward and reverse directions. The driving force of 21 or the returning means 60 of the movable guide 8 (fan gear 44) provided in the plate making lower unit 5 is switched and transmitted.

In the switching means 15, a switching plate 46 is rotatably loosely supported by a shaft 45 which rotatably loosely supports the integrated gears 16a and 16b having steps, and the switching plate 46 is rotatably supported. One end of a shaft 47 is fixed in parallel with the shaft 45. The gear 17 meshes with the gear 16b and is rotatably supported by the shaft 47 so as to be rotatable. A coil spring 48 is arranged between the gear 17 and the switching plate 46 with a weak biasing force so as to press one side surface of the gear 17 against the E ring 49. As a result, a frictional resistance stronger than the rotational frictional resistance of the switching plate 46 with respect to the shaft 45 is applied between the switching plate 46 and the gear 17.

Therefore, when the reading pulse motor 13 rotates counterclockwise and the gear 16b rotates clockwise, the rotational force is transmitted to the gear 17 and acts to rotate the gear 17 counterclockwise. The switching plate 46, which has a smaller rotational frictional resistance than the frictional resistance of the coil spring 48, rotates clockwise about the shaft 45 (gears 16a and 16b). This causes the gear 17 to move to the gear 4 as shown in FIG.
Mesh with 0. By rotating the gear 40 in the clockwise direction, the movable guide 8 (fan gear 44) is returned to the return position via the returning means 60, as will be described later. The fan gear 44 is always meshed with the gear 66 of the damper 65 that constitutes the buffer mechanism, and the movable guide 8 integrated with the fan gear 44 via the shaft 38.
The load of the damper 65 is received when the is rotated. When a sudden biasing force is generated in the rotating direction by the damper 65, the fan-shaped gear 44 reduces the biasing force and moderates the rotation of the movable guide 8.

On the other hand, when the pulse motor 13 rotates in the clockwise direction and the gear 16b rotates in the counterclockwise direction, the gear 17 acts so as to rotate in the clockwise direction.
6 rotates counterclockwise around the shaft 45. As a result, the gear 17 meshes with the gear 18, as shown in FIG. By rotating the gear 18 in the counterclockwise direction, the document separating roller 21 rotates in the clockwise direction and the document 11 is sent out.

Next, FIG. 8 is a block diagram showing the electrical construction of the present apparatus. The rotation angle information of the main motor of the printing drum 1 is input to the control unit 62. Specifically, it is composed of an encoder provided in the main motor and pulse counting means. The slit disk fixed to the rotary shaft of the main motor is detected by an optical sensor, and the angular position is obtained based on the detected number of slits. Further, the control unit 62 has the document 11
And a plurality of sensor outputs for detecting the stencil sheet 3 are input. The control means 62 controls the reading pulse motor 13 and the stencil sheet 3 for “reading” the original 11.
The write pulse motor 55 for "writing" is operated in synchronization. The reading pulse motor 13 is controlled to rotate in the normal direction and the reverse direction, performs a "reading" operation during the forward rotation, and returns the movable guide 8 through the returning means 60 during the reverse rotation. In addition, this control means 62
As described below, one rotation of the printing drum 1 is divided into a plurality of rotations to control the rotation so that the stencil sheet 3 is gradually mounted. Further, the timing of disconnecting the electromagnetic clutch 58 that stops the discharge roller 29, the timing of operating the variable guide solenoid 34 that releases the locking of the movable guide 8, and the like are controlled.

Next, the operation of the present invention will be described. Figure 9
6 is a timing chart showing the operation of each unit of the present device.
When using this apparatus, the plate-making upper unit 7 is opened and the roll-shaped stencil sheet 3 is set in the master accommodating chamber 4 of the plate-making lower unit 5 as shown in FIG. By opening the plate making upper unit 7, the guide portions 8a, 8 of the movable guide 8 are opened.
A shutter (not shown) descends in the passage of the stencil sheet 3 defined by b, and the path of the stencil sheet 3 is closed. In that state, the roll of the stencil sheet 3 is unwound and fed into the passage of the movable guide 8 until the leading end of the stencil sheet 3 hits the shutter. next,
When the plate making upper unit 7 is closed as shown in FIG. 2, the shutter (not shown) is retracted to the outside of the transfer path for the base paper. Further, the thermal head 9 interposes the stencil sheet 3 on the platen roller 1
Pressed to 0.

First, as shown in FIG. 5, when the document 11 is placed on the document presence sensor 12, the reading pulse motor 13 rotates clockwise after a predetermined time (2 seconds). As a result, the document separating roller 21 fixed to the rotation shaft of the gear 20 rotates clockwise via the gears 14 to 20, and the document 11 moves to the right. When the leading end of the document 11 reaches the detection position of the document entry sensor 51, the reading motor 13 stops, and the document 11 is sandwiched between the document separating roller 21 and the separating plate 22 and then the plate making start key is pressed. It is in a standby state until the plate-making signal is obtained.

When the plate making start key is pressed,
The stencil sheet used in the previous printing is discharged by a plate discharging device (not shown). In this plate ejection operation, a main motor (not shown) provided in the printing apparatus is driven to drive the printing drum 1
Rotates in the clockwise direction, the plate-making stencil sheet that has already been set on the printing drum 1 is peeled off and discarded in a plate discharge box (not shown). At the same time that the main motor is driven, the writing pulse motor 55 (see FIG. 3) is driven to drive the gears 55a, 5
The platen roller 10 rotates clockwise via 6a, 56b, 10a, and the stencil sheet 3 is transported to the right in FIG. After that, the front end of the stencil sheet 3 is moved to the master standby sensor 28.
Then, the rotation of the platen roller 10 is stopped, and the stencil sheet 3 is stopped at a position slightly advanced from the shutter.

After the plate discharge operation is started, the printing drum 1 becomes 1
When it reaches a predetermined position just before the end of rotation, the document reading means 64 starts "reading" the document 11 (time t1 in FIG. 9). In synchronization with this, the writing means 9 also starts "writing (making)" on the stencil sheet 3. Then, the printing drum 1 makes one rotation to the plate mounting position in FIG. 2, and when the plate discharging operation is completed, it stops at the position in FIG. The rotational angular position of the printing drum 1 is obtained by the encoder and the pulse counting means. In addition, the print drum 1 has an A detection sensor (not shown).
As a result, when the clamp means 52 is located right above, the A detection position is detected and output. In this embodiment, the angular position of the printing drum 1 is displayed with the A detection position being 0 degree.

The "reading" from the original 11 is performed by rotating the reading pulse motor 13 in the clockwise direction (normal rotation) as follows. When the reading pulse motor 13 rotates in the normal direction, in addition to the clockwise rotation of the document separating roller 21 described above, the document feeding roller 26 also rotates via the gears 14 to 18 and the gears 23 to 25. As a result, the document 11 is transferred to the right, and the reading unit 64 fixedly arranged.
Read by

The "writing" on the stencil sheet 3 is performed by the thermal head 9 while the stencil sheet 3 is moved to the right by the platen roller 10 which rotates in association with the rotation of the writing pulse motor 55. For a predetermined period from the start of this "writing", the clutch means 58 shown in FIG.
9 is rotated to transfer the stencil sheet 3 to the printing drum 1 side by a predetermined amount. The platen roller 10 and the discharge roller 29
Since the peripheral speed is low, the stencil sheet 3 is gradually loosened during the period when both rollers 10 and 29 are rotating. The "reading" operation of the original 11 and the "writing" operation of the stencil sheet 3 are both performed by continuously moving the original 11 and the stencil sheet 3. Then, as described below, the stencil sheet 3 after being “written” is printed on the printing drum 1.
The rotation driving of the printing drum 1 when wound around the sheet is performed by dividing it into several times by interposing a stationary period under the control of the control unit 62.

According to the method for winding the plate-making base paper around the plate cylinder and dividing the rotation of the plate cylinder into several times with a stationary period, the plate-making is completed after one plate is finished. Compared with the method of wrapping the base paper around the plate cylinder, not only the waiting time from the start of plate making to the end of the plate making can be shortened, but the base paper can be always wound around the plate cylinder in a constant state regardless of the plate making speed. By reducing the stroke of the movable guide that absorbs the slack and the space for accommodating the slack of the base paper, the overall size and weight of the apparatus can be reduced.

First, as the "writing" progresses,
The tip of the stencil sheet 3 reaches between the discharge roller 29 and the driven roller 30 via the fixed guide 32 and the movable guide 8. Further, due to the rotation of the discharge roller 29, the clutch means 58 is disengaged when it reaches the upper part of the clamp means 52 via the fixed guide 33 (timing t3). As a result, the discharge roller 29 is stopped, and the clamp means 52 is opened and closed back and forth (the clamp motor is turned ON / OFF) to fix the leading end of the stencil sheet 3 to the printing drum 1. Even at this time, the stencil sheet 3 is continuously "written" in the thermal head 9 portion by the rotation of the platen roller 10, but is sent to the printing drum 1 because the discharge roller 29 portion is stopped. That is, the portion not fed is loosened between the platen roller 10 as a feeding roller and the discharge roller 29.

Until the stencil sheet 3 is fixed to the clamp means 52 on the printing drum 1, the holding means 36 of the movable guide 8 shown in FIG. 10 is unlocked. Note that FIG. 10 is a side view seen from the opposite side of FIG. First, when the write pulse motor 55 rotates for a predetermined pulse from the time t1 (time t2), the movable guide solenoid 34 shown in FIG. 10 is turned on for a predetermined time. When the movable guide solenoid 34 is turned on, the link 3
5a rotates counterclockwise around the shaft 35b, and the link 3
The pin 37 of 5a comes off the hook 53 of the movable guide 8,
As a result, the movable guide 8 slightly rotates about the shaft 38 by its own weight so as to absorb the slight slack of the stencil sheet 3 generated between the platen roller 10 and the discharge roller 29. In addition, the fan-shaped gear 44 integrated with the movable guide 8 via the shaft 38.
Since the gear 66 of the damper 65 is meshed with, the above-described rotation of the movable guide 8 is against gravity after the engagement between the pin 37 and the hook 53 is disengaged (the biasing force in the rotation direction is Slow down) go slowly. For this reason, the stencil sheet 3 may be strongly pulled toward the printing drum 1 side during writing by the thermal head 9 inserted through the movable guide 8, or shocking vibration may be transmitted to the thermal head 9 through the stencil sheet 3. Since it is prevented, writing by the thermal head 9 is not adversely affected.

Thereafter, when the movable guide solenoid 34 is turned off and the pin 37 returns to the position shown in FIG. 10, the slack between the platen roller 9 and the discharge roller 29 further increases,
Since the movable guide 8 is further advanced accordingly, the pin 37 does not engage the hook 53 at this time to restrain the rotation of the movable guide 8.

Then, during the "writing" operation, the written stencil sheet 3 is continuously rotated by the platen roller 10
As a result, the amount of slack between the discharge roller 29 in the stopped state and the slack is increased. The movable guide 8 corresponds to the amount of slack generated in the stencil sheet 3 by its own weight and the shaft 38.
As shown in FIG. 5, it rotates counterclockwise around the center (see FIG. 1).
0 corresponds to clockwise). At this time, the stencil sheet 3 is always guided through the movable guide 8 formed by a pair of upper and lower guide plates 8a and 8b. Therefore,
When the movable guide 8 rotates, the stencil sheet 3 follows the movement of the movable guide 8 along the movement of the movable guide 8, so that the slack direction can be made constant and unnecessary wrinkles do not occur. The rotation state of the movable guide 8 is described as a rotation trajectory in FIG.

The timing at which the movable guide solenoid 34 for freeing the movable guide 8 is turned on is from when the writing operation is started (the writing pulse motor 55
It is the time (the above-mentioned time t2) when a predetermined period of time elapses after the start of the above) and a predetermined number of applied pulses are supplied to the write pulse motor 55. Then, after the writing further progresses and the loose stencil sheet 3 can no longer be absorbed by the rotation of the movable guide 8, the stencil sheet 3 further fed by the platen roller 10 is stored in the storage chamber 2. (The state of the stencil sheet 3 shown by the chain double-dashed line in FIG. 5, but does not appear in the movement trajectory of the movable guide 8 in FIG. 9).

At the time t4 when the pulse applied to the write pulse motor 55 reaches the first predetermined pulse number from the start of the write operation, the main motor rotates the print drum 1 by a predetermined angle (for example, 45 degrees). Then, the storage room 2
Printed stencil paper 3 stored in the printing drum 1
Roll it up.

At this time, when the clutch means 58 is in the disengaged state, the discharge roller 29 can freely rotate following the movement of the stencil sheet 3 wound around the printing drum 1. Therefore, the stencil sheet 3 is strongly pulled or its surface is pulled. The stencil sheet 3 is printed from the inside of the storage chamber 2 to the printing drum 1 without damaging it by rubbing it strongly.
Is sent out according to the rotation angle of. When the rotation of the printing drum 1 progresses and the stencil sheet 3 inside the storage chamber 2 becomes less loose, the movable guide 8 is rotated and returned in the clockwise direction (upward) in FIG. 5 against the self-weight due to the tension of the stencil sheet 3. It However, since the rotation angle of the printing drum 1 is set within a range that does not take up all the looseness of the stencil sheet 3 in the storage chamber 2, the movable guide 8 has the hook 53 with the pin 37.
Is temporarily stopped at a position (timing t5) slightly before engaging with.

After that, when the stencil sheet 3 is fed into the accumulating chamber 2 from the platen roller 10 side while the printing drum 1 is temporarily stopped, the movable guide 8 is again moved by its own weight to absorb the slack of the stencil sheet, and the movable guide 8 is rotated by the weight shown in FIG. Rotate clockwise. After that, the same operation as described above is repeated several times. In this embodiment, FIG.
After this, the main motor is still 45 degrees to 90 degrees.
, 90 degrees to 150 degrees, and 150 degrees to 360 degrees are repeated three times. Then, after the "writing" in the thermal head 9 portion is completed (time t6), the writing pulse motor 55 is stopped and the cutter 39 is operated when the written portion of the stencil sheet 3 passes the cutter 39 for a predetermined distance. Then, the plate-made portion of the stencil sheet 3 is separated from the roll portion (time t7). As shown in FIG. 5, in the cutter 39, the upper blade 39a moves up and down with respect to the fixed lower blade 39b at the operation timing of the cutter motor shown in FIG. 9 to shut off the stencil sheet 3. As a result, the end portion of the stencil sheet 3 is in the final state of being located in the storage chamber 2. After that, at the time t8, the printing drum 1 is swung all at once for the remaining angle (150 degrees to 360 degrees) of one rotation. As a result, the plate-making stencil sheet 3 stored in the storage chamber 2 is completely wound around the printing drum 1.

When the printing drum 1 starts rotating once from the A detection position to the next A detection position (timing t9), the rotation of the reading pulse motor 13 reverses and rotates counterclockwise in FIG. Timing t9). Then, the gear 17 disengages from the gear 18, meshes with the gear 40, and the reading pulse motor 13
The reverse rotation of is transmitted to the gear 40. The rotation of the gear 40 causes the sector gear 44 to rotate clockwise in FIG. 2 via the gears 41 to 43, but since the movable guide 8 is integrally coupled to the sector gear 44 via the shaft 38. , Fan gear 4
With the rotation of 4, the movable guide 8 starts to return toward the original position shown in FIG.

When the movable guide 8 returns to its original position, the hook 53 engages with the pin 37 which has already returned to its original position,
The movable guide 8 is locked at the return position in FIG. at the same time,
The fact that the movable guide 8 has returned to the movable guide sensor (see FIG.
(Time t10). When the movable guide 8 returns to its original position, the reading pulse motor 1
3 is stopped. At the same time, the writing pulse motor 55 is rotated by a predetermined number of pulses to transfer the leading end (starting end) of the stencil sheet 3 into the movable guide 8 just before the shutter in preparation for the next plate making. To finish.

Further, as shown in FIG. 9, the printing drum 1 is 270 at the third rotation after the start of the plate placement from the A inspection position.
Finally, the printing is stopped at the position (time 11), and the printing standby state is reached, but the trial printing (first printing) is performed from the latter half of the first rotation to the first half of the second rotation. At the time of subsequent printing, the print drum 1 rotates once every time one sheet is printed on the basis of 270 degrees.

In the embodiment described above, the movable guide solenoid 34 is temporarily turned on to release the engagement between the pin 37 and the hook 53, and then immediately turned off. Although the power consumption is reduced, the movable guide solenoid 3 is continuously operated during the slack feeding operation for the stencil sheet 3.
4 may be turned on. In this case, the movable guide solenoid 34 is turned off immediately before or after the movable guide 8 is returned to the initial position by the sector gear 44 by the reverse rotation of the write pulse motor 55. As a result, the stencil sheet 3 is stretched linearly between the platen roller 10 and the discharge roller 29 according to the winding state of the stencil sheet 3 on the printing drum 1, and the guide plate of the movable guide 8 becomes horizontal. Also, since the pin 37 does not engage with the hook 53, the movable guide 8 can be guaranteed to rotate a plurality of times. Further, in the above-described embodiment, the movable guide 8 is rotated about one axis, but the form in which the platen roller 10 and the discharge roller 29 move in a direction intersecting the moving direction of the stencil sheet 3 is a guide. It is also possible to adopt a configuration that moves linearly along. Further, in the above-described embodiment, the movable guide 8 is shown to guide the base paper surface by sandwiching it from the front and back sides with the guide portions 8a and 8b, but a movable guide without the guide portion 8b may be used.

FIG. 11 is a view showing another embodiment of the buffer mechanism, in which a fan gear and a damper are shown. The same figure (a)
Shows the state when the movable guide 8 is locked at the original position in FIG. The sector gear 70 includes teeth 71 of the gear 43 and teeth 72 of the gear 66 of the damper 65.
When the movable guide 8 is rotated from its original position toward the position shown in FIG. 5, the teeth 72 and the gear 66 are initially provided as shown in FIG. Is disengaged, and thereafter, the fan gear 44 is prevented from being engaged again by the reverse rotation of the reading pulse motor 13 until it is forcibly returned to the original position of FIG. 10, and the movable guide 8 is rotated during that time. The dynamic load is reduced. As a result, during the predetermined angle at which the fan gear 44 starts to rotate, the buffer mechanism by the damper 65 operates and the biasing force of the fan gear 44 in the rotation direction is reduced, so that the movable guide 8 rotates. The angle does not change rapidly, the stencil sheet 3 is prevented from being strongly pulled, and at the same time, writing by the thermal head 9 is not adversely affected.

[0042]

As described above, according to the present invention, the shortest transfer path position of the base paper is provided between the plate making means and the printing drum.
And from this shortest transfer route position in the direction intersecting the base paper surface.
Away from the storage position to increase the length of the base paper transport path
The movable guide that can be rotated by the self-weight and the movable guide is always held at the shortest transfer path position , and the starting end of the base paper is closer to the plate cylinder than the movable guide. With the configuration including the holding means for releasing the holding after being held, the generation direction of the slack of the base paper that is forcibly generated between the plate making means and the plate cylinder is restricted to one direction and the length of the base paper transfer path is increased. The slack of the base paper will be absorbed as the slack is generated, and when the stencil is wrapped around the plate cylinder, it is stretched by being squeezed lightly by the movable guide as it passes through the movable guide. It can be uniformly wound without being damaged by being bent regularly or at an acute angle and without causing wrinkles on the plate cylinder. In addition, the movable guide is given a resistance to move and rotates by its own weight.
By providing damping means to attenuate the moving force of the movable guide which is prevented sudden movement of the movable guide can prevent disturbance of the stencil sheet damage or engraving.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state where an upper unit of the apparatus is opened.

FIG. 2 is a side sectional view showing a state in which the upper unit is closed.

FIG. 3 is a side cross-sectional view showing a base paper transfer means.

FIG. 4 is a perspective view showing a clutch means.

FIG. 5 is a diagram showing an operation of feeding a stencil sheet by the apparatus.

FIG. 6 is an exploded perspective view showing a switching mechanism.

FIG. 7 is a plan sectional view of the same.

FIG. 8 is a block diagram showing control means.

FIG. 9 is a timing chart showing the operation of each unit.

FIG. 10 is a view showing a fixing mechanism of a movable guide.

11A and 11B are views showing another example of the cushioning mechanism.

[Explanation of symbols]

1 ... Printing drum, 2 ... Storage chamber, 3 ... Stencil sheet, 4 ...
Master storage chamber, 5 ... plate making lower unit, 6 ... shaft, 7 ... plate making upper unit, 8 ... movable guide, 9 ... thermal head, 10 ... platen roller, 11 ... manuscript, 12 ... manuscript presence / absence sensor, 13 ... reading pulse motor , 14 ~ 20 ...
Gears, 15 ... Switching means, 21 ... Document separating rollers, 22 ...
Separation plate, 23 to 25 ... Gears, 26 ... Document feeding roller, 2
7: driven roller, 28 ... master standby sensor, 29 ... ejection roller, 30 ... driven roller, 32 ... fixed guide, 33 ...
Fixed guide, 34 ... Movable guide solenoid, 35a ... Link, 35b ... Shaft, 36 ... Holding means, 37 ... Pin, 38
... Shafts, 39 ... Cutters, 40 ... Gears, 41-43 ... Gears,
44 ... Fan gear, 45 ... Shaft, 46 ... Switching plate, 47 ...
Shaft, 48 ... Coil spring, 49 ... E-ring, 50 ... Timing belt, 51 ... Original entry sensor, 52 ... Clamping means, 53 ... Hook, 58 ... Clutch means, 60 ... Returning means, 62 ... Control means, 65 ... Damper, 66 ... Gears.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41L 13/04 B41L 13/14

Claims (3)

(57) [Claims] 1. A cylindrical outer periphery of a base paper having a plate making means for making a base paper, and a clamp means for clamping a starting end of the base paper made by the plate making means, after the base paper is clamped by the clamp means. A printing drum wound around the surface, a transfer means for transferring the base paper made by the plate making means toward the print drum, and a shortest transfer of the base paper provided between the plate making means and the print drum.
The feed route position and the shortest transport route position intersect with the original paper surface.
The storage position that increases the length of the base paper transfer path
It is possible to rotate between the storage and
A movable guide for more rotation, a holding means for the movable guide always holds the shortest transfer path location, beginning of the base paper to release said retention after being clamped by the plate cylinder side of the movable guide, the movable A rotary printing apparatus comprising: a cushioning unit that imparts movement resistance to the guide and weakens the movement force of the movable guide that rotates due to its own weight . 2. The buffer means is the shortest transfer of the movable guide.
The rotary printing apparatus according to claim 1, wherein the movement resistance is given to the movable guide within a movement range from the path position to an intermediate position between the shortest transfer path position and the storage position. 3. The rotary printing apparatus according to claim 1, wherein the buffering means applies the movement resistance to the movable guide via a gear mechanism that interlocks with the movable guide.