JPH09240129A - Stencil printing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the impulse developing at the opening and closing a master clamper from effecting the reading of a manuscript. SOLUTION: This device is so constituted as to be equipped with a master clamper for clamping a master on the outer peripheral surface of a drum, a driving device A, which includes driving source 87 and 88 for opening and closing the master clamper and a manuscript reading device 38 for reading a manuscript by scanning. In this case, by providing buffering materials 85 between the driving device A for opening and closing the master clamper and the manuscript reading device 38, the vibration developing in the driving device A is prevented from transmitting to the manuscript reading device 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated stencil printing machine for plate making and printing, and more particularly to a master clamper for clamping a master on the outer peripheral surface of a drum and a drive source for opening and closing the master clamper. The present invention relates to a stencil printing apparatus including a driving device including the same and a document reading device which scans and reads a document.

[0002]

2. Description of the Related Art As an example of a method of holding a master on the outer peripheral surface of a drum in a conventional stencil printing machine, there is a structure as shown in FIGS. That is, the shaft 3 is attached to the body frame 1 so that the drum 2 is rotationally driven.
The document reading device 4 is attached to the upper part of the main body frame 1 while being rotatably attached. The drum 2 has a pair of annular drum flanges 5 that are opposed to each other at predetermined intervals at both ends thereof. A weight 6 for balancing the rotation is fixed to the drum flanges 5, and a fixed clamper 7 and a master clamper 8 are arranged at positions symmetrical to the weight 6.
And are attached. The master clamper 8 is
It is fixed to a support shaft 10 rotatably held by a bearing 9 fixed to the fixed clamper 7, and rotates with the rotation of the support shaft 10 to open and close the fixed clamper 7. To do. A clamper opening / closing gear 11 is fixed to one end of the support shaft 10, and the clamper opening / closing gear 11 is supported by a shaft 12 and has a tension spring 13.
It is meshed with the rack-shaped tooth portion 15 of the clamper opening / closing cam 14 which is biased toward the center by. Next, a solenoid bracket 16 is fixed to the main body frame 1 facing one of the drum flanges 5 of the drum 2, and the plate feeding solenoid 17 is fixed to the solenoid bracket 16.
And the plate discharge solenoid 18 are attached. Arms 21 and 22 whose middle portions are held by shafts 19 and 20 are connected to the plate supply solenoid 17 and the plate discharge solenoid 18, and these arms 21 and 22 have tension springs 23 and 2 respectively.
4 is urged in one direction by 4 and is connected to master clamper opening / closing shafts 25, 26 slidably attached to the main body frame 1. The tip ends of these master clamper opening / closing shafts 25 and 26 are the main body with respect to the trajectory surface drawn by the clamper opening / closing cam 14 when the plate supply solenoid 17 and the plate discharge solenoid 18 are in a free state. When the plate feed solenoid 17 and the plate discharge solenoid 18 are driven on the side of the frame 1, the clamper opening / closing cam 14 interferes with the trajectory surface drawn by the rotary movement of the clamper opening / closing cam 14 and hits the clamper opening / closing cam 14. The position is set to move to the contact position. The clamper opening / closing cam 14 has a cam surface 27 and a locking recess 28 on the inner surface side.

With such a structure, the master (original plate)
When the master is mounted on the drum 2, or when the master is separated from the drum 2, either the plate supply solenoid 17 or the plate discharge solenoid 18 is driven to open and close the master clamper 8. Hereinafter, these operations will be described. First, although the operation of each part based on the drive of the plate feeding solenoid 17 and the plate discharging solenoid 18 is similar, the plate feeding solenoid 17 and the plate discharging solenoid 1
Master clamper opening / closing shafts 25, 2 driven by 8 and
The position of 6 is different because the mounting position and the separating position of the master on the drum 2 are different.
Therefore, only the case where the plate feeding solenoid 17 operates will be described. That is, when the plate feeding solenoid 17 is driven, the arm 21 rotates around the shaft 19 against the biasing force of the tension spring 23, and the master clamper opening / closing shaft 25 advances toward the drum 2. As a result, the tip of the master clamper opening / closing shaft 25 enters the movement locus surface of the clamper opening / closing cam 14, and the cam surface 27 of the clamper opening / closing cam 14 interferes with the master clamper opening / closing shaft 25 as the rotation of the drum 2 progresses. The open / close cam 14 rotates.
Then, the master clamper opening / closing shaft 25 is fitted into the locking recess 28, whereby the rotation of the drum 2 is stopped. The rotation of the clamper opening / closing cam 14 at this time causes the clamper opening / closing gear 11 to rotate together with the support shaft 10 via the tooth portion 15,
The master clamper 8 is rotated so that its one side edge is separated from the fixed clamper 7. That is, the master clamper 8 is opened.

After the master clamper 8 is thus released, the master is fed between the fixed clamper 7 and the master clamper 8. When the energization of the plate supply solenoid 17 is released in this state, the arm 21 is returned and rotated by the force of the tension spring 23, and the master clamper opening / closing shaft 25 is returned to the original position. As a result, the master clamper opening / closing shaft 25 separates from the clamper opening / closing cam 14, and the clamper opening / closing cam 14 is brought into a free state to return and rotate by the force of the tension spring 13. By the return rotation of the clamper opening / closing cam 14, the clamper opening / closing gear 11 returns and rotates together with the support shaft 10 via the tooth portion 15, and the master clamper 8 is rotated so that one side edge thereof abuts the fixed clamper 7. . That is, the master clamper 8 is closed to clamp the master. When the plate discharge solenoid 18 is energized, the master clamper 8 opens and closes so that the master separates from the drum 2, and the operation is exactly the same as during plate feeding.

[0005]

Since the plate supply solenoid 17 and the plate discharge solenoid 18 are directly connected to the main body frame 1 via the solenoid bracket 16,
The impact generated when the plate supply solenoid 17 and the plate discharge solenoid 18 are turned on / off is transmitted to the main body frame 1 as vibration through the solenoid bracket 16. The problem here is that the document reading device 4 is attached to the body frame 1, and the document reading device 4 is attached.
Vibration is transmitted to. That is, there are various types of document reading device 4, such as a type in which an optical system is moved along a document or a type in which a document is moved in order to read a document image. In the case of the above, the optical elements are arranged apart from each other with a constant optical length, and if vibration or impact is applied to these optical systems, there is a problem that image information faithful to the original image cannot be obtained.

Further, in the plate-making printing apparatus described in Japanese Patent Laid-Open No. 61-287781, a master is made in advance before use in order to shorten the first copy time. That is, a raw paper stock device is provided between the plate making device and the drum, and the original reading device is driven to make the master plate regardless of the timing of the printing operation by the drum and the attaching / detaching operation of the master,
It stores the masters that have been plate-made in the stock paper stock device. Therefore, the on / off operation of the plate supply solenoid 17 and the plate discharge solenoid 18 is highly likely to be performed during the operation of the document reading device, and as described above, it is difficult to obtain image information faithful to the document image. . Further, in a plate-making printing apparatus of a system in which the plate-making master is slightly sagged to perform plate-making and plate-feeding at the same time, when the master is wound around the drum, the operation of rotating and stopping the drum in small steps is performed. The vibration during the rotation of the drum is suppressed by the weight 6 attached at the symmetrical position of the fixed clamper 7 and the master clamper 8 described above, but the plate feeding solenoid 17 is also turned on / off when the document is read. , Have similar problems.

[0007]

According to a first aspect of the present invention, there is provided a master clamper for clamping a master on an outer peripheral surface of a drum, and a drive device including a drive source for opening and closing the master clamper. In a stencil printing device including a document reading device that scans and reads a document,
A cushioning member is provided between the driving device for opening and closing the master clamper and the document reading device.

According to a second aspect of the present invention, the document reading device is attached to the main body frame to which the drum is attached,
A drive device for opening and closing the master clamper is attached to the main body frame with a cushioning material interposed.

According to a third aspect of the present invention, at least only the drive portion in the drive device is attached with a cushioning material interposed.

[0010]

FIG. 1 shows a first embodiment of the present invention.
The description will be based on the fourth to fourth. The stencil printing apparatus according to this embodiment has a plate making function and a printing function as an integrated device. First, a plate making writing unit 34, a paper feeding device 35, a paper discharging device 36, centering around a drum 33 rotatably held by a body frame 31 by a shaft 32,
The plate discharge device 37 and the document reading device 38 are unitized and arranged.

First, the plate making writing unit 34 makes a master 40 drawn out from a master roll 39 wound in a roll form by heating and punching by a plate making means 41, and the rear end of the plate 40 having been made plate-wise. Cutting means 4
2 and cut the drum 3 by the plate feeding means 43.
The clamper mechanism 44 of No. 3 supplies the plate. The plate-making means 41 is composed of a thermal head 45 in which fine heating elements are arranged in a line and a platen roller 46 in contact with the thermal head 45.
The plate making operation is performed by melting and punching the master 40 pulled out from the master roll 39 by the thermal head 45 according to the image information. The plate feeding means 43 is
The feeding roller pair 47, 47 'is composed of a master guide 48. The master guide 48 is cut by the cutting means 42 and the feeding roller pair 47, 47'.
Sheet-shaped master 40 sent out by
Has a role of guiding the tip of the to the clamper 44 portion.

Next, the paper feeding device 35 serves as a paper feeding means for feeding the unprinted printing paper 49 to the printing section 50.
A paper feed tray 51, on which a large number of printing papers 49 are stacked and which moves up and down in an elevator manner, a calling roller 52 that sends out the uppermost printing paper 49 to the printing unit 50 side, a pair of paper feeding rollers 53,
It is composed of a pair of resist rollers 54 and the like.

The paper discharge device 36 serves as paper discharge means for discharging the print paper 49 printed by the printing section 50 to the paper discharge tray 55 which is a paper discharge section. ing.

Further, in the vicinity of the downstream of the printing unit 50,
A peeling claw 57 for peeling the printed printing paper 49 from the drum 33 is swingably provided.

The plate discharge device 37 is for discarding the master 40 on the drum 33 that has been used for printing and is no longer needed. The plate discharge member 58 is a pair of upper and lower plates and the plate discharge box 5.
9 and the like. When the used master 40 is used for plate discharge processing by the plate discharge device 37, the drum 33 is driven to rotate counterclockwise.

Further, the document reading device 38 serves as a document reading means for optically reading the image of the document set on the contact glass 60, and the exposure lamp 61,
Counter-reflection mirror 62, first mirror 63, second mirror 6
4, a third mirror 65, a lens 66, a photoelectric conversion element 67 such as a CCD, and the like. Further, an ADF (automatic document feeder) 68 is provided on the document reading device 38. The ADF 68 automatically conveys a document set on a document table onto the contact glass 60 and sets it to a predetermined size. After being stopped at the position and being used for image reading, it has a function of discharging the document to the document tray 69. A document reading unit drive control circuit 70 is provided inside.

Next, the drum 33 has a pair of annular drum flanges 71, which are opposed to each other at predetermined intervals, at both ends thereof. These drum flanges 71
A weight 72 for balancing rotation is fixed to the fixed clamper 7 at a position symmetrical to the weight 72.
3 and the master clamper 74 are attached. The master clamper 74 is fixed to a support shaft 76 rotatably held by a bearing 75 fixed to the fixed clamper 73. The master clamper 74 rotates with the rotation of the support shaft 76 to rotate the fixed clamper 73. The opening / closing operation is performed with respect to. A clamper opening / closing gear 77 is fixed to one end of the support shaft 76.
Is engaged with a rack-shaped tooth portion 81 of a clamper opening / closing cam 80 which is supported by a shaft 78 and is urged toward the center by a tension spring 79. Then, a holding plate 83 having a pair of flat surfaces 82 is fixed to the main body frame 31 facing one of the drum flanges 71 of the drum 33,
A flat surface 84 of the holding plate 83 that faces the flat surface 82.
The solenoid bracket 86 is fixed with the cushioning material 85 interposed between the flat surfaces 82 and 84.
A plate supply solenoid 87 and a plate discharge solenoid 88, which are drive sources, are attached to the solenoid bracket 86. Arms 91 and 92 having intermediate portions held by shafts 89 and 90 are connected to the plate supply solenoid 87 and the plate discharge solenoid 88, respectively.
Numeral 92 is biased in one direction by tension springs 93 and 94, and is also coupled to master clamper opening / closing shafts 95 and 96 slidably attached to the main body frame 31. The tip portions of these master clamper opening / closing shafts 95 and 96 are the main body frame with respect to the locus surface drawn by the clamper opening / closing cam 80 when the plate supply solenoid 87 and the plate discharge solenoid 88 are in a free state. 31
When the plate feeding solenoid 87 and the plate discharging solenoid 88 are driven to the side, the clamper opening / closing cam 80 interferes with the locus surface drawn by the rotational movement and comes into contact with the clamper opening / closing cam 80. Its position is set to move. The clamper opening / closing cam 8
0 has a cam surface 97 and a locking recess 98 on its inner surface side. The mechanism from the plate supply solenoid 87 and the plate discharge solenoid 88 to the master clamper opening / closing shafts 95 and 96 serves as the drive unit A.

In such a structure, the original is set on the contact glass 60 by the ADF 68, and the plate-making start key (not shown) is turned on. This allows the drum 3
3 rotates in the direction opposite to the arrow in FIG. Then, the plate discharge solenoid 88 is energized. When the plate discharge solenoid 88 is driven, the arm 92 rotates about the shaft 90 against the urging force of the tension spring 94, and the master clamper opening / closing shaft 96.
To the drum 33 direction. As a result, the tip of the master clamper opening / closing shaft 96 enters the movement locus surface of the clamper opening / closing cam 80, and the cam surface 97 of the clamper opening / closing cam 80 interferes with the master clamper opening / closing shaft 96 as the rotation of the drum 33 progresses. The opening / closing cam 80 rotates. By rotation of the clamper opening / closing cam 80 at this time,
The clamper opening / closing gear 77 rotates together with the support shaft 76 via the tooth portion 81, and rotates the master clamper 74 so that one side edge thereof is separated from the fixed clamper 73. That is, the master clamper 74 is opened. The used master 4 mounted on the outer peripheral surface of the drum 33
0 is one of the plate discharging members 58 of the plate discharging device 37 and the drum 33.
Then, the master 40 is peeled off by being pressed against the surface of the sheet, and then discharged by the plate discharging member 58 into the plate discharging box 59 to complete the discharging operation.

Next, the drum 33 continues to rotate in the direction of the arrow in FIG. 4, and the plate feeding operation is performed. The opening and closing of the master clamper 74 during the plate feeding operation is performed in the same manner as in the plate discharging operation. That is, the plate feeding solenoid 87 is driven. As a result, the arm 91 rotates about the shaft 89 against the urging force of the tension spring 93, and the master clamper opening / closing shaft 95 advances toward the drum 33. As a result, the tip of the master clamper opening / closing shaft 95 has the clamper opening / closing cam 8
The cam surface 97 of the clamper open / close cam 80 interferes with the master clamper open / close shaft 95 as the drum 33 rotates, and the clamper open / close cam 8 moves.
0 rotates. Then, the rotation of the drum 33 is stopped by fitting the master clamper opening / closing shaft 95 into the locking recess 98. The rotation of the clamper opening / closing cam 80 at this time causes the clamper opening / closing gear 77 to move the support shaft 76 via the tooth portion 81.
The master clamper 74 is rotated together with the fixed clamper 73 so that its one side edge is separated from the fixed clamper 73. That is, the master clamper 74 is opened.

After the master clamper 74 is opened in this manner, the master 40 is fed between the fixed clamper 73 and the master clamper 74. In this state, when the energization of the plate feeding solenoid 87 is released, the tension spring 93
Force causes the arm 91 to return and rotate, thereby returning the master clamper opening / closing shaft 95 to the original position. As a result, the master clamper opening / closing shaft 95 is separated from the clamper opening / closing cam 80, and the clamper opening / closing cam 80 is set in a free state to return and rotate by the force of the tension spring 93. This clamper open / close cam 8
With the return rotation of 0, the clamper opening / closing gear 77 returns and rotates together with the support shaft 76 via the tooth portion 81, and rotates the master clamper 74 so that one side edge thereof abuts the fixed clamper 73. That is, the master clamper 74 is closed to clamp the master 40.

A plate making operation is also performed in parallel with such an operation. That is, the exposure lamp 6 of the document reading device 38
1 lights up and illuminates the original document together with the counter reflection mirror 62, and the reflected light is reflected by the first mirror 63, the second mirror 64,
The light is sequentially reflected by the third mirror 65, an image is formed on the photoelectric conversion element 67 such as a CCD by the lens 66, A / D converted by a part of the document reading drive control circuit 70, and converted from an analog signal to a digital signal. It The moving state of the optical system at this time will be described. First, the exposure lamp 61, the counter reflection mirror 62, and the original are set along the original set on the surface of the contact glass 60.
The first mirror 63 moves integrally, and in order to make the optical path length from the document surface to the photoelectric conversion element 67 constant, the second mirror 64 and the third mirror 65 are integrated to form the above-mentioned exposure lamp 61 and the like. Move in the same direction at a moving speed that is 1/2 of the moving speed of.

In parallel with the operation of the document reading device 38, the plate-making writing unit 34 also operates. That is, the plate making means 4
1 platen roller 46 and delivery roller pair 47, 4
7 ′ rotates and conveys the master 40 at a constant speed by a stepping motor (not shown), but the thermal head 45 is driven based on the image information processed by the document reading drive control circuit 70 of the document reading device 38, As a result, the thermoplastic film on the surface of the master 40 is melted and perforated for plate making. Then, as described above, the drum 3
As shown in FIG. 4, the master 40 punched by the thermal head 45 until the master clamper 74 is opened after 3 stops and the tip of the master 40 is held by the feed roller pair 47, and the feed roller pair 47 is not shown. The rotation of the electromagnetic clutch is stopped by shutting off the electromagnetic clutch or the like, so that a slack is formed between the feed roller pair 47 and the feed roller pair 47 '. Then, when the drum 33 is stopped and the master clamper 74 is opened, the electromagnetic clutch of the delivery roller pair 47 is turned on again and the delivery roller pair 47 is driven to rotate again. The leading end of the master 40 thus manufactured is sent toward the clamper mechanism 44, and is clamped between the fixed clamper 73 by closing the master clamper 74 in the open state, and then in the direction of the arrow in FIG. The master 40 is gradually wound around the outer peripheral surface of the drum 33 in accordance with the rotation of the drum 33 to complete the plate making / plate feeding operation.

When the plate supply solenoid 87 and the plate discharge solenoid 88 are turned on and off while the series of operations described above are being performed, the plunger makes an abrupt movement, which causes an impact. Although this impact cannot be suppressed, the plate supply solenoid 87 and the plate discharge solenoid 88 are attached to the solenoid bracket 86, and the solenoid bracket 86 is attached to the main body frame 31 via the cushioning material 85. Therefore, the impact generated at the portions of the plate supply solenoid 87 and the plate discharge solenoid 88 does not reach the main body frame 31 as it is. That is, since the vibration component is transmitted in a considerably damped state, the vibration component transmitted to the other mechanical portion is very weak. Therefore, accurate document reading information can be obtained without affecting the optical system in the document reading device 38.

A second embodiment of the present invention will be described with reference to FIG. The same parts as those described in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted. First, a solenoid bracket 102 is attached to the main body frame 31 with a cushioning material 101 interposed, and a drive solenoid 103 serving as a drive source is attached to the solenoid bracket 102.
Has been fixed. Above the solenoid bracket 102, a cushioning material 104 is interposed and a long hole 10 is formed.
Motor bracket 106 having 5 and moving up and down
Is provided. In this motor bracket 106, locking protrusions 107 and 108 are formed at the upper and lower sides, and the driving solenoid 103 is connected to the lower locking protrusion 107, and the upper locking protrusion 107 is connected. A tension spring 109 is connected to the projecting piece 108. Also,
A clamper opening / closing motor 110 is attached to the motor bracket 106.
A drive gear 112 that engages with and disengages from a clamper opening / closing gear 77 that is integral with the master clamper 74 is fixed to the motor shaft 111. The drive gear 112 does not mesh with the clamper opening / closing gear 77 when the motor bracket 106 is positioned above, and when the motor bracket 106 descends, the drive gear 112 does not engage with the clamper opening / closing gear 77.
It is positioned so as to mesh with. A series of mechanisms from the drive solenoid 103 to the drive gear 112 is the drive device B.

Further, the master clamper 74 is biased toward the fixed clamper 73 by a tension spring (not shown), and normally the master clamper 74 is maintained in a closed state.

In such a structure, when the drive solenoid 103 is not energized, the drive gear 112 and the clamper opening / closing gear 77 do not mesh with each other, so that no operation is shown, but the drive solenoid 103 is energized. Then, when the clamper opening / closing gear 77 comes into a fixed position as the drum 33 rotates, the clamper opening / closing gear 77 meshes with the drive gear 112, and the clamper opening / closing motor 110 rotates to rotate the clamper opening / closing gear 77 via the drive gear 112. , The master clamper 74 is opened. This master clamper 74
In order to close, the motor solenoid 106 is lifted by the force of the tension spring 109 by cutting off the power supply to the drive solenoid 103, and the engagement between the drive gear 112 and the clamper opening / closing gear 77 is released. As a result, the master clamper 74 becomes free and is joined to the fixed clamper 73 by the urging force of a tension spring (not shown) to be in a closed state. During such an operation, the shock generated by the driving solenoid 103 is absorbed by the shock absorbing material 101, and the shock generated by the clamper opening / closing motor 110 is absorbed by the shock absorbing material 104.
The vibration transmitted to the main body frame 31 is weak because it is absorbed by. Therefore, the optical system of the document reading device 38 is not affected.

[0027]

As described above, the present invention includes a master clamper for clamping the master on the outer peripheral surface of the drum,
In a stencil printing apparatus including a drive device including a drive source for opening and closing the master clamper, and a document reading device for scanning and reading a document, a drive device for opening and closing the master clamper and the document reading device. A cushioning material between the main body frame and the drum, the document reading device is attached to the main body frame, and a drive device for opening and closing the master clamper is attached to the main body frame. Since only the driving part in the driving device is attached with the cushioning material interposed, the shock when the driving device is driven is not absorbed by the cushioning material and is not transmitted to the document reading device. In this case, the movement of the optical system is performed without change, and the original information faithful to the original can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing a first embodiment of the present invention.

FIG. 2 is a view on arrow C of the portion shown in FIG.

FIG. 3 is a perspective view of a drum with a part cut away.

FIG. 4 is a vertical cross-sectional front view of the stencil printing apparatus.

FIG. 5 is a perspective view of an essential part showing a second embodiment of the present invention.

FIG. 6 is a perspective view showing an example of the related art.

FIG. 7 is a view on arrow C of the portion shown in FIG.

FIG. 8 is a perspective view of a drum with a part cut away.

[Explanation of symbols]

 31 Body Frame 33 Drum 38 Document Reading Device 40 Master 74 Master Clamper 85 Buffer Material 87 Drive Source 88 Drive Source 101 Buffer Material 103 Drive Source 104 Buffer Material A Drive Device B Drive Device

Claims (3)

[Claims] 1. A master clamper for clamping a master on an outer peripheral surface of a drum, a drive device including a drive source for opening and closing the master clamper, and a document reading device for scanning and reading a document. In the stencil printing apparatus, a cushioning material is provided between the driving device for opening and closing the master clamper and the document reading device. 2. A document reading device is attached to a main body frame to which a drum is attached, and a drive device for opening and closing a master clamper is attached to the main body frame with a cushioning material interposed therebetween. Stencil printer. 3. A drive unit in at least a drive unit is attached with a cushioning material interposed therebetween.
Alternatively, the stencil printing apparatus according to item 2.