JPH0741733B2 - Plate ejection device in stencil printing machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate discharge device in a stencil printing machine.

2. Description of the Related Art Conventionally, in the plate discharge device in this type of stencil printing machine,
The base paper wrapped around the plate cylinder is peeled off by a separating claw or the like at the end of printing, and then conveyed to a plate discharge box by a plate discharge roller, and is stored in the plate discharge box from an inlet portion on its side.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a case, since the base paper is simply stacked in the discharge box in a state of being naturally dropped,
When the number of sheets of base paper becomes large, it becomes bulky inside the stencil box, blocking the entrance of the stencil box to hinder the storage of the stencil that is conveyed later, or when the stencil box is taken out of the printing machine.
There is a problem that the base paper runs off.

Therefore, an object of the present invention is to solve the problems of the conventional plate discharge device as described above, to store the used base paper smoothly and efficiently, and the amount of the stored base paper reaches a predetermined amount. It is to provide a plate ejection device that can automatically grasp such a thing.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a plate discharge member between a plate cylinder and a plate discharge box which is provided adjacent to the plate cylinder so as to be removable. A vertically movable compression plate having a supporting member that compresses the base paper stored in the stencil sheet discharging box and projects from the stencil sheet is inserted into the box, and a guide portion that guides the supporting member of the compression plate is provided in the sheet discharging box. Is formed, a switch is provided in the moving path of the compression plate, and an upper moving member for moving the compression plate to a position above the position where the raw paper of the discharge box is loaded is provided. When it moves downward, it engages with the compression plate, but when the compression plate is obstructed by the base paper carried in the stencil box and cannot move downward, it disengages from it and does not operate. Switch does not work When
It is characterized in that a notifying means for notifying this is provided.

In the plate discharge apparatus of the present invention as described above, the base paper that has been printed and peeled off the plate cylinder is peeled from the plate cylinder and discharged into the plate discharge box by the plate discharge member, where it is supported by the upper moving member. The compression plate waiting at the upper position lowers by its own weight as the upper moving member moves downward to compress the base paper, and when this lowering is completed, the upper moving member moves up again. The compression plate is moved up to the original position, and when the compression plate is moved down, the switch engages with the switch, but the switch operates, but the compression plate is moved down by being disturbed by the base paper carried into the stencil box. If it is not possible, the switch will disengage from it and will not work, and if the switch does not work like this,
The notification means reports this.

In the embodiment of the present invention shown in the drawings, 1 is a plate cylinder, 2 is a base paper, and a pair of upper and lower non-plate rollers 3 and 4 adjacent to and abutting on each other are provided. A pair of upper and lower auxiliary rollers 5 and 6 are provided at positions laterally separated from the rollers 3 and 4, and endless belts 7 and 8 are suspended between the roller pairs 3, 5;

The sub rollers 5 and 6 are located in the opening 16 above one side of the plate discharge box 9, and the plate discharge box 9 is also opened upward, from which a lateral compression plate 10 is placed, and the upper part of the compression plate 10 is placed. Horizontal support shaft
11 is provided, and this support shaft 11 is fitted in a vertical guide groove 12 provided on the side wall of the plate discharge box 9 so as to be movable in the vertical direction. Actuators 13 are provided on both ends of the support shaft 11 that project outward from the plate discharge box 9, and a switch 14 that is operated by the actuator 13 when the actuator 13 moves downward is provided on the outer wall of the plate discharge box 9. An arm 15 is disposed below the roller 6 by being swung by a driving member (not shown) provided on the machine frame, and a tip of the arm 15 supports a lower end of the actuator 13 when the arm 15 swings upward. And it is designed to move up.

In the above type, when printing is completed, the plate cylinder 1 rotates in the direction of the arrow in FIG.
4 also rotates in the direction of the arrow, and the plate discharge roller 4 is pressed against the plate cylinder 1 by a member not shown. As a result, the base paper 2 wound around the plate cylinder 1 is peeled off from the ends thereof and sandwiched by the rollers 3 and 4, and further rides on the belt 8 and moves in the direction of the arrow, from the opening 16 to the plate discharge box. It is discharged to 9. At that time, the base paper 2 is guided by the belts 7 and 8 without being wound around the plate discharge rollers 3 and 4, and the compression plate 10 is moved to the arm 1
The vehicle is waiting at the upper position (a) indicated by the solid line in FIG. When the plate discharge roller 4 finishes peeling the base paper 2,
3 Return to the position away from the plate cylinder 1 as shown in Fig. 3. In this way, the base paper 2 enters the plate discharge box 9 through the opening 16 of the plate discharge box 9 and is stored over its entire length. When the base paper 2 is stored in the plate discharge box 9, the arm 15 is instructed by a sensor (not shown). Rotates in the clockwise direction from the upper position a to the lower position b shown by the chain line, and the actuator 13 mounted on it, that is, the compression plate 10, moves downward due to its own weight and the base paper 2 is moved as shown in FIG. Compress to. When this downward movement is completed, the arm 15 rotates counterclockwise in the opposite direction to the forward direction, and the compression plate 10 again moves upward to the upper position B. This upward movement must be carried out when it does not hinder the accommodation of the base paper 2 in the plate discharge box 9 at the start of plate discharge, and when the plate discharge box 9 is attached or detached, it does not hinder it. Moreover, it is necessary to take a long time for compression to improve the compression efficiency.

During such a vertical movement, the compression plate 10 has its shaft 11 moved up and down along a guide groove 12 provided on the side wall of the plate discharge box 9 and is not displaced leftward or rightward. Such operation of the compression plate 10 may be performed every time one sheet of the base paper 2 is discharged, or may be performed every time a plurality of sheets of the base paper 2 are discharged.

When the compression plate 10 is moved downward, the actuator 13 is engaged with the switch 14, but the height of the base paper 2 stored by repeating the plate discharge process is as shown in FIG. When the position is higher than the position of the switch 14, even when the arm 15 is rotated to the lower position opening by the plate discharging operation, the downward movement of the compression plate 10 is stopped by the upper surface of the base paper 2 and the actuator 13 does not engage with the switch 14.

Therefore, the switch 14 is set at a position where the storage base paper is full in the stencil box 9, and when the actuator 13 is being lifted by the arm 15 and the actuator 13 no longer engages with the switch 14, it is notified that the switch 14 is full. When a control circuit (not shown) configured as described above is provided and the operator knows that the control circuit is full, the plate discharge box 9 is removed from the printing machine, and the waste paper 9 is taken to another waste paper disposal place, where the waste paper 2 inside is removed. At this time, the waste paper may be discarded, but the waste paper box 9 containing the raw paper 2 may be thrown away. By doing so, it is possible to perform the waste paper discharge work of the raw paper without soiling the hands.

FIG. 4 shows a block diagram of a printing machine in which the present invention is used. 21 is a printing unit, 22 is an operation unit, 23 is a control unit, 24 is a display unit, and the printing unit 21 is Plate removing device 2
5. A plate making device 26, a plate feeding device 27, and a printing device 28 are provided, and the operation unit 22 has a ten-key 29, a start key 30, and a confidentiality key.
It has a group of operation keys such as 31 and the control unit 23 includes a microcomputer, and has an arithmetic circuit 32, a command circuit 33, a RAM 34 and a ROM 35.
Have.

When printing is to be performed in the above-described configuration, the original is set in the original setting section (not shown), the required number of copies is input using the ten keys 29 of the operation section 22, and the start key 30
By operating, each device for plate discharge, plate making, plate feeding, and printing operates according to an instruction from the command circuit 33, and required printing is automatically performed.

FIG. 5 shows a flow chart of a program incorporated in the control unit 23 in order to carry out confidentiality maintenance work.
When printing is completed and the content of the printed matter is to be kept confidential, the confidentiality key 31 of the operation unit 22 is operated. By operating this security key 31, the control unit 23
The instruction is input to the arithmetic circuit 32 to be subjected to arithmetic processing, and the confidentiality mode instruction is stored in the memory of the RAM 34. This memory is composed of, for example, a non-volatile memory or a backup battery for holding information in the memory,
Therefore, even if the power is turned off, the stored information should not be erased. When such a confidentiality holding mode is stored in the RAM 34, the print program is not executed unless another original is set as shown in FIG. After that, to release the stored confidentiality mode, set another document and perform the above-mentioned operations necessary for normal printing work. About plate making, plate feeding, and printing are resumed.

FIGS. 6 to 8 show examples of printing cylinders suitable for use in the printing machine described above. The body 38 is a support shaft
A seat plate 42 is rotatably supported by the machine frames 40 and 40 'by a 39, and a seat plate 42 having a flat portion 41 is provided on the outer peripheral surface thereof along the axial direction. The elastic plate 43 is provided, and the thin plate 44 is attached to the upper surface of the elastic plate 43. Bearings 45 are provided near both ends of the flat portion 41 of the seat plate 42, and a rotary shaft 46 is pivotally supported by the bearings 45. One end of a support plate 47 is fixed to the rotary shaft 46. A rubber magnet 48 attached to the thin plate 44 is attached to the back surface. A gear 49 is attached to one end of the rotary shaft 46 that projects outward from the flange 50 on one side of the body 38 of the rotary shaft 46.

A pin 51 is provided on the flange 50, and the base end of the segment gear 52 is pivotally supported on the pin 51.
Meshes with. And this segment gear 52 is a spring 53
Is always urged toward the center by the stopper pin provided on the flange 50 at the vertical swing limit position.
Since it is stopped by 54, an arcuate slot 55 is provided. A cam surface 57 is formed on the lower side surface of the segment gear 52, and a cam roller 58 is slidably fitted to the machine frame 40 so as to reciprocate so as to engage with or disengage from the cam surface 57 at a position facing the cam surface 57, The cam roller 58 is a spring (not shown) provided on the machine frame 40, and is normally at a position separated from the cam surface 57 as shown in FIG. 7, and is in a position where it is engaged by a solenoid (not shown).

When it is desired to clamp the base paper on the plate cylinder in the state as shown in FIG. 6, the solenoid is energized to move the cam roller 58 to the cam surface 57.
Move to a position that engages with. Then, when the body 38 is rotated clockwise, the cam roller 58 relatively moves along the cam surface 57, and the segmented gear 52 resists the tension of the spring 53 and swings clockwise around the pin 51. Move. This swinging causes the gear 49 meshing with the segment gear 52 to rotate counterclockwise, and moves the support plate 47, that is, the magnet 48 to a position shown in FIG. To do.

Here, when the base paper supply means (not shown) supplies the printing base paper to the opening, and the sensor of the base paper supply means detects that the leading end of the printing paper has reached the opening,
The energization of the solenoid is stopped, and the cam roller 58 is separated from the cam surface accordingly. Due to this disengagement, the segment gear 52 is pulled by the spring 53 and returns to the position shown in FIG. 6, whereby the rubber magnet 48 and the thin plate 44 hold the leading end of the base paper to complete the clamp, and the plate cylinder moves counterclockwise. It rotates in the direction and winds the base paper.

Since this plate cylinder is as described above, the polyester film surface of the base paper faces the rubber magnet 48, which increases the coefficient of friction, and the thin plate 44 is attached to the seat plate 42 by the plurality of elastic plates 43. Support plate 47
Even if the rubber magnet 48 is slightly undulating, the adhesion to the base paper is good, the base paper is securely clamped, and the support plate 47 has rigidity so that the opening angle can be small and mechanical It is prevented from becoming too large.

Another example of the plate discharge device is shown in FIG. 9, where 61 is a plate cylinder and 62 is a base paper. On the plate discharge side of the plate cylinder 61, a pair of upper and lower plate discharge rollers abutting against each other are provided. 63, 64 are provided, and these plate discharge rollers 63, 64 are given an appropriate holding pressure by springs 65, 66 stretched between their axes. The plate discharge roller 64 is driven by a motor 67 via a reduction gear train 68. When the load on the motor 67 increases, the rotation speed of the motor 67 automatically decreases.

The plate cylinder 61 rotates in the direction of the arrow at a peripheral speed VD by a driving member (not shown), and the plate discharge rollers 63 and 64 at a peripheral speed VR. In this case, when an instruction to discharge the base paper 62 comes out and the base paper 62 comes to a predetermined position, the actual application filed by the applicant earlier is
The base paper edge scooping means disclosed in Japanese Patent No. 102956 operates to rotate the free end of the base paper 62.
It is guided to the contact part of and is caught. Then, the base paper 62 is separated from the plate cylinder 61 by the rotation of the plate discharge rollers 63 and 64, is conveyed, and is housed in a plate discharge box (not shown).

In the above case, the peripheral speed when the base paper 62 is idling without being pinched is VRO and the load is L. The breakdown of the load L is the sum of rolling resistances in the gear train 68, bearings and the like. Then, according to the magnitude of such load L, the motor
The peripheral speed VRO is determined from the output characteristic of 67, and this value is set to be faster than the peripheral speed VD of the plate cylinder 61 (Fig. 10).

Next, the base paper 62 is sandwiched between the plate discharge rollers 63 and 64, and the plate cylinder 61 is inserted.
When it is separated from the plate discharge rollers 63 and 64, it tries to separate the base paper 62 at the peripheral speed VRO, but since the peripheral speed of the plate cylinder 61 is VD smaller than that, the plate discharge rollers 63 and 64 and the plate cylinder are separated. 61 is pulled together through the base paper 62, and the force at this time becomes the tension T. By the way, the driving member of the plate cylinder 61 is hardly affected by the tension T, so that the peripheral speed VD thereof is not changed by the tension T. As a result, the plate ejection roller
The peripheral speeds VR of 63 and 64 try to approach the peripheral speed VD, and therefore the load applied to the motor 67 is that the tension T is added to the load L during idling, and this value is the value of the motor 67 at that rotational peripheral speed. Balanced with the generated rotational force F1, F1 = L + T. That is, when T = F1−L and the peripheral speeds of the plate discharge rollers 63 and 64 are constant, F1 and L are constant, while the peripheral speed VD of the plate cylinder 61 is also constant, so the tension T is almost constant. As a result, stable base paper peeling is performed. In this case, the tension T must be set so as not to exceed the allowable applied tension of the base paper 62 or the frictional force between the plate discharge rollers 63 and 64 and the base paper 62, but it can be set arbitrarily by changing the output characteristic of the motor 67. You can

Fig. 11 shows the base paper by changing the gear ratio of the gear train 68.
It shows that the tension TN of 62 and the idling peripheral velocity VRN change.
When I becomes larger, the idling peripheral speed VRN becomes smaller.

FIG. 12 shows that the tension TN of the base paper 62 and the idling peripheral speed VRN are changed by changing the voltage applied to the motor 61. When the tension TN is increased, the idling peripheral speed VRN is also increased.

EFFECTS OF THE INVENTION The present invention is as described above, in which a plate discharge member is provided between the plate cylinder and a plate discharge box adjacent to the plate cylinder and which can be excluded, and the plate discharge box is housed in the plate discharge box. A vertically movable compression plate having a supporting member that compresses the base paper and projects from the compressed base paper is inserted, and a guide portion that guides the supporting member of the compression plate is formed in the stencil box. A switch is provided on the moving path, and an upper moving member is provided for moving the compression plate to a position higher than a position where the raw paper in the stencil box is loaded.The switch engages with the compression plate when the compression plate is moved downward. It operates, but when the compression plate is obstructed by the base paper carried into the stencil box and cannot move downward, it disengages from it and does not operate.When the switch does not work in this way , Notification means for notifying this Since the used base paper stored in the stencil box is compressed to the bottom of the stencil box by the compression plate, it can be stored efficiently and the storage efficiency is improved, and the amount of the stored stencil has reached the specified amount. Can be automatically grasped, and when discarding the base paper, it is necessary to remove the stencil box from the machine before discarding it, so that the worker does not stain his or her fingers and the waste base paper. There is an effect such that overflow can be prevented.

[Brief description of drawings]

FIG. 1 shows that the embodiment of the present invention peels the base paper from the plate cylinder,
FIG. 2 is a partially cutaway front view showing the compression plate in the upper position, FIG. 2 is a partially cutaway front view showing the compression plate in the lower position, and FIG. 2 is a block diagram of a printing machine in which the present invention is used, FIG. 5 is a flow chart of a program of the control unit of the same, and FIG. 6 is the same as that of FIG. FIG. 7 is a side view of a portion of a plate cylinder suitable for the printing machine of FIG. 7, FIG. 7 is a front view of the same, FIG. 8 is a drawing similar to FIG. 6 when the same is unclamped, and FIG. FIG. 10 is a perspective view of another example of the plate discharging device suitable for the printing machine of FIG.
FIG. 12 is an output characteristic diagram of the motor when the reduction ratio of the plate discharge roller is changed, and FIG. 12 is an output characteristic diagram of the motor when the applied voltage of the motor is changed. 1 ... plate cylinder, 2 ... base paper 3,4 ... plate ejection roller, 5,6 ... secondary roller 7,8 ... endless belt 9 ... plate ejection box, 10 ... compression plate 11 ... support shaft 13 ... … Actuator 14 …… Switch, 15 …… Arm

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hironori Takasawa 3-1, Nakameisei, Shibata-cho, Shibata-gun, Miyagi Prefecture Tohoku Ricoh Co., Ltd. (72) Inventor Hiroshi Sugano, Nakata, Shibata-shi, Shibata, Miyagi Shinmeido 3 -1 Tohoku Ricoh Co., Ltd. (56) Reference JP-A-59-11281 (JP, A) JP-A-60-6492 (JP, A) Actually-opened Sho-61-35855 (JP, U) Actually-opened 61-204765 (JP, U)

Claims (1)

[Claims] 1. A plate discharging member is provided between a plate cylinder and a plate discharging box adjacent to the plate cylinder so as to be removable, and the plate discharging box compresses a base paper stored in the plate discharging box, and then A vertically movable compression plate having a projecting support member is inserted, and a guide part for guiding the support member of the compression plate is formed in the stencil box, and a switch is provided in the movement path of the compression plate. Further, an upper moving member is provided for moving the compression plate upward to a position higher than the position where the base paper of the stencil box is carried in, and the switch is engaged with the compression plate when the compression plate is moved downward, but the compression plate is discharged. When the base paper carried into the box prevents it from moving downwards, it disengages from it and does not work.When the switch does not work in this way, a notification means to notify this is provided. A stencil characterized by being provided Plate discharge device in the printing machine.