JP3472387B2 - Stencil printing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine for storing a used master used in the stencil printing machine.

[0002]

2. Description of the Related Art A stencil printing machine prints a master by heat-sensitive perforation, winds it around a printing drum, supplies ink into the printing drum, transfers the ink that has passed through the holes of the master to the printing paper, and forms an image on the printing paper. To print. After printing is finished
The user discards the master wrapped around the print drum. At this time, the user's hands and clothes are stained with the ink. Therefore, conventionally, there has been proposed and generally used a plate discharging device that separates a used master from the printing drum, conveys it, and stores it in a plate discharging storage box. In this plate discharge device, if used masters are naturally dropped into the plate discharge storage box and stacked, they will be bulky and cannot be stored efficiently.Therefore, move the compression plate up and down in the plate discharge storage box. The used master is compressed and stored. Such a plate discharging device is disclosed in Japanese Utility Model Laid-Open No. Sho 61-204765 and Japanese Patent Laid-Open No. Sho 59-59.
No. -11281.

The plate discharge apparatus disclosed in Japanese Utility Model Laid-Open No. 61-204765 is equipped with a compression plate which is movable up and down inside a plate discharge box, and a used master is compressed by its own weight to store the plate. Store in a box.

In the plate discharge device disclosed in Japanese Patent Laid-Open No. 59-11281, a circular cam expands and contracts a pantograph mechanism, and a compression plate provided at the tip of the pantograph mechanism compresses a used master to discharge the plate. Store in the storage box.

However, in these plate discharging devices, since the used master is compressed by the weight of the compression plate, a sufficient compression force cannot be obtained.

A plate discharge device as shown in FIGS. 12 and 13 is disclosed in Japanese Utility Model Laid-Open No. 61-204765 and Japanese Patent Laid-Open No. 59-59.
It overcomes the problems of the plate ejection device disclosed in Japanese Patent No. 11281. As shown in FIG. 12, this plate discharge device 1
It is provided close to the printing drum 3 of the stencil printing machine 2. The plate discharge device 1 is provided with a support portion 4.
A plate discharge storage box 5 is detachably supported on the support portion 4. A compression plate 6 is provided above the plate discharge storage box 5 so as to be vertically movable. Further, a plate discharge transport path 7 is formed between the upper part of the plate discharge storage box 5 and the printing drum 3.

The plate discharge storage box 5 has an opening 8 formed in the upper portion thereof, and both side plates 9 are formed with a long notch groove 10 along the moving direction of the compression plate 6. A penetrating shaft 11 is fixed to the upper portion of the compression plate 6. A cover 13 is provided on the support portion 4 so as to be openable and closable on the downstream side (left side in FIG. 12) of the used master 12 in the transport direction. Further, the plate discharge transport path 7 is formed by a pair of transport belts 14 which are vertically opposed to each other. The lower conveyor belt 14 is provided on the peeling roller 15 that can be brought into contact with and separated from the printing drum 3, and the contacting / separating direction according to the contacting / separating operation of the separating roller 15 provided on the plate discharge storage box 5 side. It is hung around the transport roller 16 which can be moved to. The upper conveyor belt 14 includes a pair of conveyor rollers 1.
It has been passed over to 7. The peeling roller 15 is provided so as to come into contact with the printing drum 3 when the used master 12 is peeled from the printing drum 3 and to separate from the printing drum 3 at other times.

Further, as shown in FIG. 13, the plate discharge device 1
A guide groove 19 is formed in each of the both side plates 18 along the vertical movement direction of the compression plate 6, and a compression plate drive device 20 is provided. In the guide groove 19,
The through shaft 11 is slidably inserted. The lower portion of the guide groove 19 and the cutout groove 10 are arranged so that the through shaft 11 is slidably passed through the cutout groove 10.
And are overlapping. Further, the compression plate driving device 20 is provided with an arm 23 whose one end on the upstream side is supported by a shaft 21 and whose one end on the downstream side is urged downward by a tension spring 22. A long groove 24 is formed at the distal end of the arm 23 on the downstream side, and a cam follower 25 is provided near the central portion. The through shaft 11 is fitted in the long groove 24. A cam 26 is rotatably provided below the cam follower 25. This cam 2
A motor 29 is connected to 6 via two gears 27 and 28. The cam follower 25 is provided with the cam 26.
It is provided so that it can come into contact with.

According to such a configuration, the peeling roller 15
The used master 12 is peeled off from the printing drum 3 by means of, and is conveyed to the plate discharge storage box 5 by the conveyor belt 14 and placed in the plate discharge storage box 5 in a state of being naturally dropped. And
When the rear end of the used master 12 is conveyed to the plate discharge storage box 5, the motor 29 makes one rotation. The driving force of the motor 29 is reduced by the gears 28 and 27 and transmitted to the cam 26, and the cam 26 makes one rotation. When the cam 26 starts to rotate, the arm 23 pushed up by the cam 26 is rotated downward by the tension spring 22 to push down the compression plate 6.
Then, the used master 12 is pressed against the bottom surface of the plate discharge storage box 5 by the compression plate 6. Thereafter, the arm 23 is pushed up by the cam 26, and the compression plate 6 ascends in the plate discharge storage box 5 along the guide groove 19 and the notch groove 10 and returns to the original position. In this way, the used master 12 is compressed by the compression plate 6 and stored in the plate discharge storage box 5.
Then, the compression plate 6 moves at an ascending / descending movement distance according to the amount of the used master 12 stored in the plate discharge storage box 5, and is urged downward by the tension spring 22 to compress the used master 12. Then, it is efficiently stored in the plate discharge storage box 5. Further, when the discharged master storage box 5 is filled with the used master 12, the user opens the cover 13, and the discharged master storage unit 5 is taken out from the support unit 4, so that the used master storage box 5 has been used. The master 12 is thrown into a trash can or the like. Then, the emptied plate discharge storage box 5 is stored in the support portion 4 again, the cover 13 is closed, and the used master 12 is set in the plate discharge storage box 5 to be stored.

[0010]

However, such a plate discharge device 1 has many problems. Among these, there are three problems due to the use of springs. First, since the tension springs 22 are used, if the used master 12 stored in the plate discharge storage box 5 is small in amount, the compression plate 6 has a weak force to compress the used master 12, and the plate discharge Used master 12 stored in storage box 5
When the amount of the compression spring 6 increases, the expansion amount of the tension spring 22 when the compression plate 6 compresses the used master 12 gradually increases,
The force with which the compression plate 6 compresses the used master 12 gradually increases, that is, the compression force changes depending on the amount of the used master 12. Therefore, there is a problem that compression cannot be performed in the same state.

Secondly, if a tension spring that can obtain a sufficient compression force is used even when the used master 12 stored in the stencil sheet storage box 5 is small, the compression plate 6 is moved to the top dead center. When the cam 26 is rotated, an excessive output torque is required when the cam 26 is rotated, which causes an excessive load on the motor 29.

Thirdly, when the used master 12 stored in the stencil storage box 5 is small in amount and the moving distance is long, the compression plate 6 descends and collides with the bottom surface of the stencil storage box 5.
The problem is that noise and vibration are generated.

As another problem, since the compression plate 6 temporarily compresses the used master 12, the used master 12 cannot be sufficiently compressed, and the compression plate 6 is not compressed. When returning to the top dead center, the used master 12 once compressed is elastically restored. for that reason,
There is a problem that a large number of used masters 12 cannot be stored in the discharged stencil storage box 5.

Further, since the notch groove 10 is formed in the plate discharge storage box 5, there is a problem that the strength is insufficient.

Further, since the tension springs 22, the arms 23, etc. are provided on both side plates 18, the direction in which the plate discharge storage box 5 is taken out is limited to only the downstream side of the plate discharge device 1, and the operability is poor. There is a problem.

If the used master 12 stored in the plate discharge storage box 5 is small in amount and the used master 12 conveyed to the plate discharge storage box 5 naturally falls from the opening 8, the distance is long. The state of the used master 12 that has naturally fallen into the stencil waste storage box 5 is likely to change irregularly, and the used master 12 is evenly stored by being biased to one side or being stored in one part. Not stored in
There is a problem that a large number of used masters 12 cannot be stored in the discharged stencil storage box 5.

The present invention has been made in view of the above problems, and a large number of used masters can be stored in the plate discharge storage box, and the used masters can be compressed by a constant compression force. It is an object of the present invention to provide a plate discharge device of a stencil printing device that can prevent jamming.

[0018]

The invention according to claim 1 is
In a plate discharge device of a stencil printing machine, wherein a stencil storage box having an opening is detachably supported by a supporting portion, and a used master is sent into the plate discharge storage box through the opening and stored therein. And a bottom plate that is provided so as to be able to move toward and away from the base and supports the master, and a direction in which the bottom plate approaches and separates from the opening in the vicinity of the opening.
A compression plate that is movably provided in the same direction as that for compressing the master between it and the bottom plate; a compression plate drive unit that drives and moves the compression plate; and a position of the bottom plate that sets the plate discharge storage. The bottom plate position adjusting means is provided to separate the bottom plate from the opening as the storage amount of the master in the box increases.

According to a second aspect of the present invention, the bottom plate position adjusting means in the plate discharge device of the stencil printing apparatus according to the first aspect is formed by a brake mechanism that applies a braking force to the bottom plate in a direction away from the opening. The braking force by the brake mechanism is set to be weaker than the driving force of the compression plate by the compression plate drive unit.

According to a third aspect of the invention, the brake mechanism in the plate discharging apparatus of the stencil printing apparatus according to the second aspect has a one-way clutch mechanism for limiting the direction in which the braking force is applied to the direction away from the opening.

According to a fourth aspect of the present invention, the bottom plate position adjusting means in the plate discharge device of the stencil printing apparatus according to the first aspect of the invention is arranged on each of a pair of opposing side walls of the plate discharge storage box along the moving direction of the bottom plate. A pair of pulleys arranged one by one, a timing belt hung around each of these two sets of pulleys and connected to the bottom plate, and a driving force of the compression plate by the compression plate drive unit in a direction away from the opening with respect to the bottom plate. And a resistance means for applying a weaker braking force.

According to a fifth aspect of the invention, the resistance means in the stencil printing apparatus of the fourth aspect has a one-way clutch mechanism for limiting the direction in which the braking force is applied to the direction away from the opening.

The invention according to claim 6 is the same as claim 1,
In the plate discharge device of the stencil printing machine according to 3, 4, or 5,
A drive source that is provided separately from the plate discharge storage box and that generates a drive force; a drive mechanism that is provided in the plate discharge storage box and that drives the bottom plate by the drive force of the drive source to approach the opening; An engaging / disengaging means for engaging / disengaging the drive source and the drive mechanism according to attachment / detachment to / from the storage box is provided.

The invention according to claim 7 is the invention according to claim 1,
In the plate discharge device of the stencil printing machine according to 3, 4, 5 or 6, the plate discharge storage box is attached to and detached from the support portion along a direction orthogonal to the transport direction of the used master.

[0025]

[0026]

According to the present invention, the position of the bottom plate is set by the bottom plate position adjusting means, and the bottom plate is moved away from the opening as the amount of used masters stored in the plate discharge storage box increases. The distance between the opening and the used master in the stencil storage box can always be kept constant, and the used master can be compressed by the bottom plate and the compression plate. The used master is stored, and the used master is compressed with a constant compression force, so that the used master has a uniform compression state.

According to the second aspect of the present invention, the braking mechanism applies a braking force weaker than the driving force of the compression plate by the compression plate driving unit to the bottom plate in the direction away from the opening, thereby keeping the compression plate constant. The bottom plate can be moved in a direction away from the opening simply by moving it, and the used master can be compressed with a compression force equal to the braking force, so a constant compression force is obtained,
In addition, the structure is simple and the control is easy.

In the third aspect of the invention, the bottom plate can be brought closer to the opening with a small force by limiting the direction in which the braking force of the brake mechanism is applied by the one-way clutch to the direction away from the opening. The driving force required when the bottom plate is moved to the position closest to the opening is reduced.

In the invention according to claim 4, the bottom plate position adjusting means is formed by the pulley, the timing belt and the resistance means, and a braking force weaker than the driving force of the compression plate by the compression plate driving section is applied to the bottom plate. By adding in the direction away from the opening, the bottom plate can always be kept parallel to the opening and moved away from the opening simply by moving the compression plate a certain distance, and with a compression force equal to the braking force. Since the used master can be compressed, a stable and constant compression force is obtained, and the structure is simple and the control is easy.

According to the fifth aspect of the invention, since the direction in which the braking force of the resistance means is applied is limited to the direction away from the opening by the one-way clutch, the bottom plate can be brought close to the opening with a small force. The driving force required when the bottom plate is moved to the position closest to the opening is reduced.

In the sixth aspect of the invention, the drive source and the drive mechanism are engaged and disengaged in accordance with the attachment and detachment of the support portion and the plate discharge storage box by the engaging / disengaging means, whereby the plate discharge storage box is stored in the support portion. Since the drive source and the drive mechanism can be engaged with each other and the bottom plate can be brought close to the opening, when the plate discharge storage box is stored in the support portion, the bottom plate is moved to the position closest to the opening. Since the drive source and the drive mechanism can be separated when the stencil sheet storage box is moved and taken out from the support portion, the stencil sheet storage box is prevented from becoming heavy.

According to the seventh aspect of the present invention, the user can attach / detach the plate discharge storage box to / from the support portion along the horizontal direction orthogonal to the direction in which the used master is conveyed, so that the user can see from the front side of the stencil printing machine. The stencil storage box can be stored and taken out, improving operability.

[0033]

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows an image forming apparatus 31 using a stencil printing apparatus 30. A printing drum 32 is rotatably provided at the center of the stencil printing machine 30. Around the printing drum 32, from the top along the rotation direction at the time of printing (clockwise direction in FIG. 2), the scanner 3
3, a plotter 34, a conveyance path 35, and a plate discharge device 36 are provided. A paper feed unit 37, a press roller 38, and a paper discharge unit 39 are provided on the transport path 35 from the upstream side (the right side in FIG. 2). Further, the image forming apparatus 31 is provided with an online sorter 40 on the paper discharge section 39 side.

Further, as shown in FIG. 1, the plate discharging device 3
6, a support portion 41 is provided. This support 41
In the inside, a plate discharge storage box 42 is stored so as to be freely inserted and removed from the front side of the stencil printing apparatus 30 (the front side in FIG. 1) which is the horizontal direction orthogonal to the transport direction of the used master.
Above the plate discharge storage box 42, a compression plate 44 is movably provided by being biased upward by a tension spring 43. Further, a separating roller 45 is provided between the plate discharge storage box 42 and the printing drum 32 so as to come into contact with and separate from the printing drum 32.
Is provided. A transport roller 46 is rotatably provided on the peeling roller 45.

A cam 47 for moving the compression plate 44 up and down by a distance L is provided above the compression plate 44. The cam 47 has a large gear 48 and a small gear 4.
A compression plate drive motor 50 is connected via 9 and 9.
The above-mentioned cam 47, gears 48, 49, and compression plate drive motor 50 form a compression plate drive section.

Further, on the support portion 41, guide guides 51 are provided at both corners of the bottom along the storage direction of the plate discharge storage box 42.
Is formed, and the sensor 52 is provided near the center of the bottom surface.

Further, the plate discharge storage box 42 has an opening 53 formed in the upper portion thereof, and a vertically long guide groove 55 formed in side plates 54 on the front and rear sides in the storage direction, and the sensor 52 on the bottom surface. Is formed with a hole 56 from which the tip of the. A bottom plate 57 is slidably provided along the guide groove 55 in the plate discharge storage box 42. Further, as shown in FIGS. 3 to 7, each of the side plates 54 has a first shaft 58 near the upper end of the guide groove 55.
Is provided. A first pulley 59 is rotatably provided on the first shaft 58. Further, the plate discharge storage box 42 is provided at its lower portion with one long second shaft 60 rotatably provided so as to penetrate the front and rear side plates 54. The second shaft 60 is provided with a second pulley 61 at a portion protruding from each of the side plates 54. Each of the second pulleys 61 is provided with a brake mechanism (not shown) having a one-way clutch mechanism (not shown), and an uneven portion 62 is formed on the circumference. The second pulley 61 is also a resistance means. Further, a timing belt 63 is spanned between the first pulley 59 on the front side and the second pulley 61 on the front side, and the first pulley 59 on the back side and the first pulley 59 on the back side. The second pulley 61 includes the timing belt 6
3 has been passed over. These timing belts 63
An uneven portion 64 that engages with the uneven portion 62 is formed on the. Further, the bottom plate 57 is formed with projecting portions 65 projecting from the guide grooves 55 at the front and rear ends thereof. The protrusion 65 is fixed to the timing belt 63 so that the bottom plate 57 is always kept in parallel. The first shaft 58, the first pulley 59, the second shaft 60, the second pulley 61, and the timing belt 63 described above.
Thus, a drive mechanism 67 of the bottom plate drive unit 66, which is a bottom plate position adjusting means, is formed.

A pair of round pins 68 are fixed to the second shaft 60 along the circumferential direction on the inner side of the second pulley 61 on the inner side, and on the inner side of the round pin 68. A convex portion 69 having a tapered tip is formed.

Further, the plate discharge storage box 42 is formed with a handle 70 for taking out on the front side, and a tongue portion 71 protruding between the plurality of peeling rollers 45 provided coaxially. ing.

Further, as shown in FIG.
A female shaft 73 is rotatably provided on the bearing 72 so as to face the convex portion 69. A concave portion 74 is formed on the front end of the female shaft 73 so as to face the convex portion 69. A cutout groove 75 having an opening whose front side gradually expands is formed on the circumferential portion of the recess 74. The bottom plate drive unit 6 includes the second shaft 60, the round pin 68, the convex portion 69, the female shaft 73, the concave portion 74, and the cutout groove 75.
An engagement / disengagement mechanism 76, which is engagement / disengagement means 6 is formed.

Furthermore, the bearing 7 is attached to the female shaft 73.
A large gear 77 is fixed to the back side of the second gear 2. A small gear 78 is connected to the large gear 77. A bottom plate drive motor 79, which is a drive source of the bottom plate drive unit 66, is connected to the small gear 78.

In such a structure, an image of a document (not shown) is read by the scanner 33, and the master is heated and perforated by the plotter 34 based on the image of the document. After the master is wound around the printing drum 32, the printing paper 80 is fed from the paper feeding unit 37, the ink that has passed through the holes of the master is transferred to the printing paper 80, and the image of the original is copied. The printing paper 80 on which the image of the original is copied is conveyed from the paper output unit 39 to the online sorter 40.

After that, when the image of the original is copied onto the desired number of printing papers 80, the used master 81 is separated from the printing drum 32 by the plate discharging device 36 and the plate discharging storage box 4 is removed.
The operation of storing in 2 is started. At this time, before starting the storage operation of the used master 81, in the plate discharge device 36, the compression plate 44 is normally pushed down to the bottom dead center by the cam 47. The braking force is applied to the bottom plate 57 by the second pulley 61 only in the direction in which the bottom plate 57 descends. Further, the bottom plate 57 is lowered from the top dead center by the amount of the used master 81 stored in the discharged plate storage box 42. Then, the used master 8 stored in the plate discharge storage box 42 by the compression plate 44 and the bottom plate 57.
1 is compressed. Therefore, when storing the used master 81, first, the cam 47 is rotated by the compression plate drive motor 50, the compression plate 44 is moved up from the bottom dead center to the top dead center by the distance L, and the used master 81 is stored. Create a space to be transported.

Next, the peeling roller 45 is connected to the printing drum 32.
While moving to the side (the position of the dotted line in FIG. 1) and rotating in the counterclockwise direction, the printing drum 32 rotates in the counterclockwise direction, and the used master 81 is separated from the printing drum 32. At this time, the used master 81 is sandwiched between the peeling roller 45 and the conveying roller 46 by the peeling roller 45 and is conveyed to the plate discharge storage box 42. Then, the used master 81 is placed on the bottom plate 57.

When the rear end of the used master 81 is placed on the bottom plate 57, the compression plate driving motor 50 rotates the cam 47. Then, the compression plate 44 descends by the distance L from the top dead center to the bottom dead center. At this time, the bottom plate 57
Is lowered when pushed by a force larger than the braking force, but does not fall even when pushed by a force less than the braking force. Therefore, is dropped by the newly conveyed used master 81 and is added to the bottom plate 57. The used master 81 is compressed with a force equal to the braking force applied.

Thereafter, as shown in FIG. 9, the above-described operation is repeated, and a large number of used masters 81 are stored in the plate discharge storage box 42, and when the plate discharge storage box 42 becomes full,
The bottom plate 57 includes a large number of used masters 81 and compression plates 44.
And lower to bottom dead center. Then, the bottom plate 57 pushes the sensor 52. When the sensor 52 is pushed by the bottom plate 57, the display section (not shown) indicates that the plate discharge storage box 42 is full to inform the user. At this time, the compression plate driving motor 50 rotates the cam 47, and the compression plate 44 moves from the bottom dead center to the top dead center by the distance L. Then, the plate discharge storage box 42 is ready to be taken out of the plate discharge device 36. After that, the user opens the front cover (not shown) on the front side of the support portion 41, and the plate discharge storage box 42 is taken out to the front side along the guide guides 51.
The used master 81 in 2 is thrown into a trash box or the like.

When the user discharges the discharged stencil storage box 42 from the front side along the guide 51, the convex portion 69 of the engaging / disengaging mechanism 76 engages with the concave portion 74, and the round pin 68 is engaged. Engages with the rear side of the cutout groove 75. Then, the bottom plate drive motor 79 rotates. The driving force of the bottom plate drive motor 79 is transmitted to the second shaft 60 via the gears 77, 78 and the engagement / disengagement mechanism 76, the timing belt 63 is driven via the second pulley 61, and the bottom plate 57 is moved. Ascend to top dead center.

In this way, the bottom plate 57 is made up of the first pulley 59, the second pulley 61 and the timing belt 63.
Are always kept parallel to each other and are slid, a braking force is applied only in a descending direction by the second pulley 61, and the compression plate 44 is moved up and down by a constant distance L by the cam 47, so that the compression force is reduced. It is possible to compress the used master 81 without using a tension spring to generate
It is possible to prevent the change of the compression force, and it is possible to lower the bottom plate 57 in accordance with the amount of the used master 81 stored in the plate discharge storage box 42, so that the used master 81 is compressed with the compression force equal to the braking force. It can be compressed and a strong and stable compression force can be obtained. Therefore, the structure for moving the compression plate 44 up and down is simplified,
Easy control, less load, and
A large amount of the used master 81 is stored in the plate discharge storage box 42, and the used master 81 is compressed at a constant pressure, so that the used master 81 has a uniform compression state. In addition, the side plate 5 has a notch groove whose upper end reaches the opening 53.
Since it is not necessary to form the plate 4, the reduction of the strength of the plate discharge storage box 42 is prevented.

When the plate discharge storage box 42 is stored in the plate discharge device 36, the convex portion 69 engages with the concave portion 74 and the round pin 6 is engaged.
8 engages with the notch groove 75 and transmits the driving force of the bottom plate drive motor 79 to the two timing belts 63, so that the bottom plate 57 automatically rises to the top dead center. Further, the one-way clutch mechanism of the second pulley 61 can raise the bottom plate 57 with a slight force, so that the bottom plate drive motor 79 is downsized and required when raising the bottom plate 57 to the top dead center. Time is reduced. Further, when the plate discharge storage box 42 is taken out from the plate discharge device 36, the projection 6
9 separates from the recess 74 and the round pin 68 separates from the cutout groove 75, so that the bottom plate drive motor 79 can be provided in the plate discharge device 36 separately from the plate discharge storage box 42.
It is prevented that the plate discharge storage box 42 becomes heavy.

Further, by sliding the bottom plate 57,
When discarding the used master 81 stored in the plate discharge storage box 42, the bottom plate 57 is slid to slide the used master 81.
Can be thrown away. Therefore, the used master 8
Even if 1 adheres to the plate discharge storage box 42 due to ink, it is reliably discharged.

Further, by increasing the sliding distance of the bottom plate 57, the vertical movement distance of the compression plate 44 can be shortened. Therefore, the used master 8 in the stencil storage box 42
The time required to store 1 is shortened.

Furthermore, since the used master 81 is normally compressed by the bottom plate 57 and the compression plate 44, elastic recovery of the used master 81 can be suppressed. Therefore, a large amount of the used master 81 can be stored in the discharged stencil storage box 42.

Further, since the first pulley 59, the second pulley 61, and the timing belt 63 for keeping the bottom plate 57 in parallel and sliding are provided in the plate discharge storage box 42, the storage direction of the plate discharge storage box 42 is improved. The stencil printing apparatus 30 can be arranged in any of the front side, the back side, and the paper discharge unit 39 side, so that the operability when the stencil storage box 42 is taken in and out is improved.

Further, the plate discharge storage box 42 is arranged from the front side along the horizontal direction orthogonal to the conveying direction of the used master 81.
The operability is improved by taking in and out. Also,
It is not necessary to provide a dead space for taking in and out the stencil storage box 42 on the side of the paper discharge section 39 of the stencil printer 30. Therefore, the online sorter 40 is provided so as to be in close contact, and the space is reduced.

In this embodiment, the plate discharge storage box 42 is housed in the support portion 41 so that the opening 53 is located above, and the bottom plate 57 is provided in the plate discharge storage box 42 so as to be vertically movable. , A bottom plate 57 that can move toward and away from the opening 53
Is provided in the stencil storage box 42, and a compression plate 44 is provided in the vicinity of the opening 53 so that a certain range can be moved toward and away from the bottom plate 57.
The position of the opening 53 when storing the is not limited to the upper side.

Reference Example 1 of the present invention will be described with reference to FIG. The same parts as those described in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted (the same applies to reference example 2 below). Plate removing device 8
In FIG. 2, a plate discharge storage box 83 is stored in the support portion 41 so that the support plate 41 can freely move in and out from the front side of the stencil printing apparatus 30. A top plate 84 is formed on an upper portion of the plate discharge storage box 83, and an opening 85 is formed so as to face the peeling roller 45 and the conveyance roller 46. The second shaft 60 is provided with a third pulley 86. Further, although not shown, a motor for moving the bottom plate 57 up and down via the engagement / disengagement mechanism 76 is provided.

According to such a configuration, the plate discharge storage box 83
The motor lowers the bottom plate 57 in accordance with the amount of the used master 81 stored in the plate, and the motor is moved between the upper end of the used master 81 stored in the plate discharge storage box 83 and the tongue 71 of the opening 85. Stop at a position where the distance is constant. When the rear end of the used master 81 is placed on the bottom plate 57, the motor raises the bottom plate 57 and the used master 8 is moved.
1 is pressed against the top plate 84. After that, the motor moves to the bottom plate 57.
Is lowered to rest again at a position where the distance between the upper end of the used master 81 stored in the plate discharge storage box 83 and the tongue 71 of the opening 85 is constant. As a result, the used master 81 can always be placed on the bottom plate 57 in the same state. Therefore, the occurrence of jam is prevented.
Further, by compressing the used master 81 between the bottom plate 57 and the top plate 84, the amount of the used master 81 stored in the plate discharge storage box 83 increases.

A second reference example of the present invention will be described with reference to FIG. The plate discharge device 87 is provided with a compression device 88 between the printing drum 32 and the plate discharge storage box 42. In the compression device 88, a pair of first conveying rollers 89 is provided on the printing drum 32 side, and a pair of second conveying rollers 90 is provided on the plate discharge storage box 42 side. A peeling claw 91 is provided on the shaft of the first transport roller 89 on the lower side so as to come into contact with and separate from the printing drum 32. The pair of first transport rollers 89 are pressed against each other by a first spring 92 attached to each shaft. The pair of second transport rollers 90 are pressed against each other by the second springs 93 attached to their shafts, and the convex portions of the concave and convex portions formed on the circumferential portion are in contact with each other. . Also,
Although not shown, the bottom plate 57 is attached via an engaging / disengaging mechanism 76.
A motor for moving up and down is provided.

According to this structure, as shown in FIG. 11A, the peeling claws 91 approach the printing drum 32 and peel the used master 81. And FIG. 11 (b)
As shown in FIG. 3, the first transport roller 89 sends out the used master 81 to the plate discharge storage box 42 side, and the second transport roller 90 prevents the used master 81 from advancing, Compress the master. After that, when the rear end of the used master 81 is sent out from the first transfer roller 89, the second transfer roller 90 rotates to transfer the compressed used master 81 to the discharged plate storage box 42. Then, the bottom plate 57 is lowered by the motor by the amount of the newly used used master 81. As a result, the used master 81 can always be placed on the bottom plate 57 in the same state. Therefore, the occurrence of jam is prevented.

[0061]

According to the first aspect of the present invention, the bottom plate position adjusting means separates the bottom plate from the opening as the amount of the used master stored in the plate discharging storage box increases, so that the opening and the inside of the plate discharging storage box are separated from each other. Since the distance between the used master and the used master can always be kept constant, and the used master can be compressed by the bottom plate and the compression plate, a large number of used masters can be stored in the plate discharge storage box. Moreover, the used master can be compressed with a constant compression force, the compressed state of the used master can be made uniform, and the occurrence of jam can be prevented.

According to a second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the braking mechanism applies a braking force weaker than the driving force of the compression plate by the compression plate driving section to the bottom plate from the opening. By adding in the direction of moving away, the bottom plate can be moved away from the opening by moving the compression plate a fixed distance, and the used master can be compressed with a compression force equal to the braking force. A constant compressive force can be obtained, the structure can be simplified, and control can be facilitated.

According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, by limiting the direction in which the braking force of the brake mechanism is applied by the one-way clutch to the direction away from the opening, a small force can be applied. Since the bottom plate can be brought closer to the opening, the driving force required when the bottom plate is moved to the position closest to the opening can be reduced.

According to a fourth aspect of the present invention, in addition to the effect of the first aspect of the invention, the bottom plate position adjusting means is formed of a pulley, a timing belt and a resistance means, and the compression plate drive section drives the compression plate. By applying a braking force weaker than the force to the bottom plate in the direction away from the opening,
By simply moving the compression plate a certain distance, the bottom plate can be kept parallel to the opening and moved away from the opening, and the used master can be compressed with a compression force equal to the braking force. Therefore, a stable and constant compressive force can be obtained, the structure can be simplified, and control can be facilitated.

According to a fifth aspect of the invention, in addition to the effect of the fourth aspect of the invention, by limiting the direction in which the braking force of the resistance means is applied by the one-way clutch to the direction away from the opening, a small force can be applied. Since the bottom plate can be brought closer to the opening, the driving force required when the bottom plate is moved to the position closest to the opening can be reduced.

The invention according to claim 6 is based on claims 1, 2 and
In addition to the effect of the invention described in 3, 4, or 5, by engaging and disengaging the drive source and the drive mechanism in accordance with the attachment and detachment of the support portion and the plate discharge storage box, the support portion is provided with the plate discharge storage box. Since the drive source and the drive mechanism can be engaged when stored and the bottom plate can be brought closer to the opening, the bottom plate is closest to the opening when the plate discharge storage box is stored in the support portion. Since the drive source and the drive mechanism can be separated when the stencil sheet storage box is taken out from the support portion, it is possible to prevent the stencil sheet storage box from becoming heavy.

The invention according to claim 7 is the same as claim 1,
In addition to the effects of the invention described in 3, 4, 5 or 6, the user attaches and detaches the plate discharge storage box to and from the support portion along the horizontal direction orthogonal to the direction in which the used master is conveyed, so that the user can perform the stencil printing apparatus. The stencil sheet storage box can be stored and taken out from the front side of, so that the operability can be improved.

[0068]

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a plate discharge device according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing the image forming apparatus.

FIG. 3 is a front view showing a plate discharge storage box.

FIG. 4 is a plan view thereof.

FIG. 5 is a vertical sectional side view thereof.

FIG. 6 is a perspective view showing a drive mechanism.

FIG. 7 is a perspective view showing a part thereof.

FIG. 8 is a plan view showing a drive source and engagement / disengagement means.

FIG. 9 is a vertical cross-sectional front view showing the discharged stencil storage box in other states.

FIG. 10 is a vertical cross-sectional front view showing a plate discharge device of the stencil printing machine according to Reference Example 1 of the present invention.

FIG. 11 is a vertical cross-sectional front view showing a plate discharge device of a stencil printing machine according to Reference Example 2 of the present invention.

FIG. 12 is a vertical sectional front view showing a conventional plate discharge device.

FIG. 13 is a front view thereof.

[Explanation of symbols]

41 Support 42 Waste plate storage box 44 compression plate 53 openings 54 side plate 57 Bottom plate 59 First pulley 61 Second pulley 63 Timing belt 66 Bottom plate position adjusting means 67 Drive mechanism 76 Engagement means 79 Drive source 81 Used master

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-55-30922 (JP, A) JP-A-3-278982 (JP, A) JP-A-8-238835 (JP, A) 29370 (JP, U) JP-B-62-55993 (JP, B2) JP-B-52-41779 (JP, Y1) JP-B 5-36709 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B41L 13/14

Claims (7)

(57) [Claims] 1. A plate discharge apparatus of a stencil printing apparatus, wherein a plate discharge storage box having an opening is detachably supported by a support, and a used master is sent into the plate discharge storage box through the opening and stored therein. A bottom plate that is provided in the storage box so as to be able to move toward and away from the opening to support the master, and the bottom plate near the opening with respect to the opening.
The compression plate that is provided movably in the same direction as the direction in which the compression plate moves toward and away from the bottom plate and that compresses the master between the bottom plate, a compression plate drive unit that drives and moves the compression plate, and the position of the bottom plate. A plate discharge device for a stencil printing machine, comprising: a bottom plate position adjusting means for setting the bottom plate away from the opening as the amount of the master stored in the plate discharge storage box increases. 2. The bottom plate position adjusting means is formed by a braking mechanism that applies a braking force to the bottom plate in a direction away from the opening, and the braking force by the braking mechanism is more than the driving force of the compression plate by the compression plate driving unit. The stencil ejector of the stencil printing machine according to claim 1, wherein the stencil printer is also weakly set. 3. The stencil ejector of a stencil printing machine according to claim 2, wherein the brake mechanism has a one-way clutch mechanism for limiting the direction in which the braking force is applied to the direction away from the opening. 4. The bottom plate position adjusting means includes a pair of pulleys, one pair of which are arranged on each of the pair of side walls of the plate discharge storage box which face each other along the moving direction of the bottom plate, and the two sets of pulleys. It is formed by a timing belt that is passed over and connected to the bottom plate, and resistance means that applies a braking force weaker than the driving force of the compression plate by the compression plate drive unit to the bottom plate in the direction away from the opening. A stencil ejector for a stencil printing machine according to claim 1. 5. The stencil ejector of a stencil printing machine according to claim 4, wherein the resistance means has a one-way clutch mechanism for limiting the direction in which the braking force is applied to the direction away from the opening. 6. A drive source that is provided separately from the stencil storage box and that generates a driving force; and a drive mechanism that is provided in the stencil storage box and drives the bottom plate by the drive force of the drive source to bring the bottom plate closer to the opening. 6. An engagement / disengagement means for engaging / disengaging the drive source and the drive mechanism in accordance with attachment / detachment of a support portion and the plate discharge storage box.
Plate discharge device of the hole plate printing apparatus. 7. The plate discharge storage box is attached to and detached from the support portion along a horizontal direction orthogonal to the conveying direction of the used master. Stencil ejector for stencil printer.