JPS62127277A - Pressing solenoid device for stencil duplicator - Google Patents

Abstract

PURPOSE:To facilitate controlling a printed density, by a system wherein a cylindrical elastic press roller for pressing a printing paper against a stencil paper is driven by protruding an actuator of a solenoid device, and the press roller is brought into contact with a form cylinder at an intermediate point within the entire protrusion amount. CONSTITUTION:With a voltage applied to a solenoid 41S, a movable shaft 67 is moved upward, and the upper end face 67a thereof is located in the gap l3 between the spacing l2 between the end face 67a when the movable shaft 67 is protruded by the maximum amount and a solenoid device 41 and a corresponding spacing l1 when no voltage is applied to the solenoid 41S. Such a setting is made that a press roller 40 makes contact with a form cylinder 20 before the end face 67a reaches a position corresponding to l2, and an actuator 59 is moved in a protruding direction even after the press roller 40 comes into contact with the form cylinder 20, thereby pressing the roller 40 against the form cylinder 20 securely and firmly. Accordingly, by enabling the voltage applied to the solenoid 41S to be varied, the force with which the roller 40 is pressed against the form cylinder 20 can be varied to control printed density.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a press solenoid device for stencil printing gia, which allows easy adjustment of print density on printing paper.

(Prior art and its problems) Conventionally, in a stencil printing device, factors that affect printing density include the amount of ink applied to the squeegee roller, the pressure of the squeegee roller on the second plate cylinder, the pressure of the press roller on the second plate cylinder. Examples include pressure contact force.

Among these factors, when adjusting the print density by varying the ink application port to the squeegee roller, it is sufficient to adjust the minute distance between the squeegee roller and the doctor roller, but if the distance is 1/1 The adjustment itself requires skill, as it is quite small at 100 m + n units, and the doctor roller and squeegee roller must be adjusted so that they are spaced evenly along their respective longitudinal directions. It is extremely difficult to adjust the

In addition, when adjusting the print density by varying the pressure contact force of the squeegee roller against the plate cylinder, the pressure contact force can be varied by adjusting the eccentric cam, etc., but this also applies to l1ra.
The left and right eccentric cams, etc. must be adjusted so that pressure is evenly applied, taking into account unevenness, which is an extremely difficult task.

Furthermore, when adjusting the printing density by varying the press pressure of the press roller on the plate cylinder, the press pressure can be varied by adjusting the position of the press spring, or by varying the return force of the spring by adjusting the screw. Although it is relatively simple to do this, it must also be adjusted by taking into consideration the parallelism of the press rollers, and it is difficult for the user to adjust it himself.

In addition, if the print density changes due to factors such as temperature changes, there is a problem in that the user himself cannot adjust the print density.

(Object of the Invention) An object of the present invention is to operate a cylindrical elastic press roller for pressing printing paper against a stencil paper wrapped around the outer periphery of a cylindrical plate cylinder using an actuator driven by a magnetic biasing force of a solenoid device. The press roller is configured to be able to be driven as the actuator moves, and the press roller comes into contact with the plate cylinder when the protruding distance of the actuator protruding from the case of the solenoid device reaches the full protruding amount, so that the printing paper An object of the present invention is to provide a press solenoid device for a stencil printing device, which allows easy adjustment of printing density.

(Structure and Effects of the Invention) In order to achieve the above object, the present invention includes a cylindrical elastic press roller for bringing printing paper into pressure contact with a stencil paper wrapped around the outer periphery of a cylindrical plate cylinder; a supporting member rotatably supported at both ends in the longitudinal direction; and an actuator having a solenoid disposed inside the case and protruding from the case by a biasing force corresponding to a voltage applied to the solenoid. a movable block, one end of which is connected to the protruding end of the actuator and the other end of which is connected to the support member, for transmitting the biasing force of the solenoid to the press roller. ; The press roller comes into contact with the plate cylinder while the actuator reaches its full protrusion.

According to such a configuration, the press roller contacts the plate cylinder while the actuator protrudes from the case of the solenoid device and reaches the full protrusion amount. Therefore, even after the press roller contacts the plate cylinder, the actuator It protrudes widely, allowing the press roller to reliably and firmly abut against the plate cylinder.

Therefore, by varying the amount of protrusion of the actuator after the press roller contacts the plate cylinder, it is possible to vary the amount of pressure between the press roller and the plate cylinder and adjust the printing density on the printing paper. In other words, since the print density of printing can be controlled simply by controlling the applied voltage supplied to the solenoid device, the print density can be easily adjusted.

In addition, since the press roller is made of an elastic member such as relatively hard rubber, by varying the pressing force of the press roller against the plate cylinder, the area of contact with the plate cylinder changes due to the elastic deformation of the press roller. This also allows the printing density on the printing paper to be adjusted.

(Explanation of Examples) An embodiment of this invention will be described below.

FIG. 1 is an external view of a stencil printing apparatus 1 to which the present invention is applied.

In the figure, a lid 2 is attached to one side of the upper part of a case 1a of a stencil printing device 1 using a hinge 2a (see Figure 3), etc., so that the lid 2 can be opened and closed. It is configured to set the stencil paper S at a predetermined position.

Further, as shown in FIG. 2, the case 1a is provided with an operation panel 5 such as a flat keyboard, which includes a numeric keypad 58 for setting the number of prints, a print start key 5b, a print stop key 5C9 A mark (111) is provided such as a density setting key 5d, a print speed setting key 5e, and a display section 5f such as an LCD display that displays the set number of prints and the like.

FIG. 3 shows the internal mechanism of the stencil printing apparatus 1 according to the present invention.

In the figure, the cylindrical plate cylinder 20 has its own central axis 20
It is rotatably supported around C by a machine frame (not shown). This plate cylinder 20 has a porous structure and has a clamp mechanism 21 on the outer periphery.
It is configured to intermittently lock one end of the stencil paper S.

That is, the clamp mechanism 21 is pivoted by a band-shaped permanent magnet 22 fixed to the outer peripheral surface of the plate WA20 and extending along one generatrix thereof, and a shaft 23 extending along the axial direction of the plate cylinder 20. It has a supported movable clamp piece 24. A gear 25 is attached to one end of the shaft 23, and the gear 25 is connected to a drive supported by one end of a lever 26 when the plate cylinder 20 is in the initial rotation position (the position shown in FIG. 3). The gears 27 are designed to mesh appropriately. The lever 26 is supported on a machine frame (not shown) by a pivot 28, and when the solenoid 29 is not energized, it is biased counterclockwise in the figure by the spring force of a spring 30 to separate the drive gear 27 from the gear 25. On the other hand, when the solenoid 29 is energized,
It rotates clockwise in the figure against the spring force of the spring 30, so that the drive gear 27 meshes with the gear 25 of the plate cylinder 20 at the initial rotation position. The drive gear 27 is the lever 26
The gear 25 is rotated and the clamp piece 24 is moved between the clamp position where it is attracted to the permanent magnet 22 and the permanent magnet 2.
2, and a fully open position, which is approximately 1800 turns counterclockwise in the figure from the clamp position.

The plate cylinder 20 is drivingly connected to a sprocket 34a provided coaxially with the central axis 20G, and this sprocket 34a
is drivingly connected to the drive sprocket 34b of the electric TA 33 by an endless chain 32. With this power transmission device, the plate cylinder 20 is rotated clockwise in the drawing intermittently or continuously by the electric motor 33.

Further, a printing ink supply means 35 is provided inside the cylinder of the plate WA20, and this printing ink supply means 35 is disposed so that its outer circumferential surface contacts the inner circumferential surface of the plate fg420, and its central axis 37 The squeegee roller 36 includes a squeegee roller 36 that can rotate around the plate cylinder 20, and a doctor rod 38 that extends along the generatrix direction of the roller with a predetermined gap from the outer peripheral surface of the squeegee roller 36. The printing ink in the ink reservoir A is supplied to the inner peripheral surface of the plate fg420 by being rotationally driven in the same direction as the plate W420 in synchronization with the rotation of the plate fg420. That is, as the squeegee roller 36 rotates, the printing ink in the ink pool A passes through the gap between this roller and the doctor rod 38, and at this time, the ink is collected and transferred to the squeegee roller 3.
A printing ink layer of uniform thickness is formed on the outer peripheral surface of the plate cylinder 6, and this printing ink layer is supplied to the inner peripheral surface of the plate cylinder 20 as the squeegee roller 36 rotates and is used for printing.

Below the plate cylinder 20, there is a press solenoid device 40 for pressing the printing paper P onto the plate cylinder 20, which is the main part of the present invention.
0 is placed. This press solenoid device 400
As shown in FIG. 4, a cylindrical press roller 40 made of an elastic member such as rubber is rotatably attached to one end of a pair of lever elements 50 (supporting members), and a shaft 51 is attached to the other end.
is fixed, and both ends of this shaft 51 are rotatably supported by side plates 52.

Further, a lever 53 is attached to one end of the shaft 51, and a spring 54 is attached to one end of the lever 53, and the spring force of the spring 54 causes the lever element 50 to constantly rotate around the shaft 51 as a fulcrum. It is biased clockwise.

An intermediate bar 55 is attached to approximately the center of the lever element 50, and a support protrusion 58 that rotatably supports a disc-shaped roller 56 by a shaft 57 is fixed to the lower center surface of the intermediate bar 55. . A cylindrical solenoid device 41 is disposed below this support block 58, and this solenoid device 41 has a solenoid 413 (described later) inside thereof.
It has a cylindrical actuator 59 which is arranged so as to be able to protrude from one end surface of the device 41 in response to an urging force corresponding to the voltage applied to the solenoid 41S. One end of this actuator 59 is attached to the lower surface of an engagement block 60 that engages with the roller 56, and this engagement block 60 is fitted into a pipe member 61 with a slit, and is inserted into the outer surface of the pipe member 61. Tightening is done by adjusting the screw 63 provided on the block 62 to connect the actuator 59 of the solenoid 41 and the engagement block.
Configured to be fixed. Furthermore, screws 64 are attached to both sides of the engagement block 60,
A belt member 65 made of rubber or the like is wrapped around the screw 64 and the shaft 57, so that the engagement between the rod 056 and the engagement block 60 is maintained at all times even during operation.

As is clear from the above description, the movable block B in this embodiment includes the disc-shaped rollers 56. Support block 58. Engagement block 60. Tightening is performed by blocks 62 and the like.

Further, a coil spring 66 is fitted and fixed to the actuator 59 (see FIG. 5), and the solenoid device 41
A predetermined interval is provided between the block 62 and the tightening block 62. This is because the actuator 59 starts up slowly when the solenoid device 41 is energized, so the spring 66
By maintaining the state in which the plate cylinder 20 has been moved a predetermined amount upward, it is possible to prevent the influence on the press timing of the press roller 40, and also to prevent the clamp mechanism 21 provided on the plate cylinder 20 from rotating during the rotation operation of the plate cylinder 20. is the press roller 40
This setting is made in consideration of the amount of movement necessary to release the press roller 40 so as not to interfere with the press roller 40.

Next, the press solenoid device which is the main part of this invention! 4
00 will be briefly explained in detail.

FIG. 5 shows the state before voltage is applied to the solenoid device 41, and in the figure, inside the solenoid device 41,
It has a movable shaft 67 that is movable by the magnetic force generated by the solenoid 413 and this solenoid 418. The lower end of an actuator 59 is fixed to the upper part of the movable shaft 67. It is configured to be trackable.

Further, in this state, the distance between the upper surface 67a of the movable shaft 67 and the lower surface of the case of the solenoid device 41 is 11.

Next, when a voltage is applied to the solenoid 41S, the generated magnetic force causes the movable shaft 67 to move upward in the figure. In this state, the upper end surface 67a of the movable shaft 67 projects in the direction in which the movable shaft 67 protrudes to the maximum. The distance between the end surface 67a and the bottom surface of the case of the solenoid device 41 when 2 and the above distance I21! Located between 3. Moreover, the end surface 67a is the above! 2, the press roller 40 has a plate size of 11 m2.
0, and the press roller 40
Even after the actuator 59 comes into contact with the plate cylinder 20, the actuator 59 further moves in the projecting direction, and the press roller 40 can be brought into reliable and firm pressure contact with the plate cylinder 20.

Therefore, by varying the amount of protrusion of the actuator 59, that is, the voltage applied to the solenoid 413,
The printing density of printing can be adjusted by varying the pressing force between the press roller 40 and the plate 11120.

In addition, since the press roller 40 is formed of an elastic member such as relatively hard rubber, when the pressing force of the press roller 40 to the plate WA20 is varied, the press roller 40
is elastically deformed and the contact area with the plate [20 changes, so
This also allows the printing density of the printing paper to be adjusted.

The paper feed tray 4 is provided with a pinion 48 connected to a motor (not shown) and an output transmission mechanism that transmits the output of the motor, and a rack 49 that is engaged with the pinion 48. The rack 49 is provided substantially perpendicular to the paper feed tray 4 and has a serpentine engagement portion 49a that engages with the pinion 48, so that the paper feed tray 4 is also moved up and down as the pinion 48 rotates.

In other words, the paper feed tray 4 is moved up and down in accordance with the amount of printing paper P set on the paper feed tray 4, so that the paper feed mechanism 60 can easily take in the printing paper P.

The paper feeding mechanism 60 includes rollers 61, 62, 63 made of rubber or the like.
etc., and takes printing paper P from the paper feed table 4 and transfers it to the plate cylinder 20.
It is supplied to the outer periphery of the

Also, around the plate cylinder 20, above the paper feed table 4, there is a stencil paper removal mechanism 70. A printed paper peeling claw 80 is provided at a position facing the paper feed mechanism 60, and this claw 80 is used to remove the printed paper after printing has been completed from the plate cylinder 20, and the peeled paper is removed from the plate cylinder. Due to the rotational force given by the rotation of 20, the sheets fly to the lower right side in the figure, and are successively stacked and held on the sheet discharge table 3.

On the stencil set plate 100 on which the stencil paper S is set, there is provided an optical sensor 101 that detects the presence or absence of the stencil paper S. When it is detected that the stencil paper S is set on the stencil paper set board 100, Either one of the feed rollers 102 and 103 is rotationally driven, and the stencil paper S is transferred to the conveyance path 10.
7 to the clamp mechanism 21.

As explained above, in the printing apparatus 1 in this embodiment, the stencil paper S is conveyed to the clamp mechanism 21, the leading end of which is clamped to a part of the plate cylinder 20, and the stencil paper S is placed on the outer peripheral surface of the plate cylinder 20. After wrapping and applying ink to the stencil paper S, printing is performed by wrapping and pressing the printing paper P against the outer peripheral surface of the printing cylinder, and each mechanism is controlled by a microcomputer.

FIG. 5 shows the electrical components of the stencil printing apparatus 1 according to the present invention.

In the figure, a CPU 200 composed of a microprocessor or the like includes a ROM 210 storing programs for controlling various mechanisms within the device, and an operation panel 5. Optical sensor 101 for detecting the presence or absence of stencil paper S. Duplicate paper S
an optical sensor 90 that detects when the plate cylinder 20 has been conveyed to a position where it can be clamped, and a plate cylinder drive motor 33 that constitutes a plate cylinder drive unit that rotates the plate cylinder 20 in divided rotations or continuous rotation.
゜ Paper feed roller drive motor 60M, conveyance roller drive motor 102M that conveys the stencil paper S, clamp mechanism 21
．． Plate discharge mechanism (stencil paper removal mechanism) 70, solenoid device 41. Calculation results of the power supply circuit 230 and microprocessor that control the applied voltage to be supplied to the solenoid device 41 are temporarily stored, or print setting information input from the numeric keypad 5a of the operation panel 5 or set by the print speed setting key 5d. A RAM that stores printing speed information and printing degree information set with the print density setting key 5e at any time.
220 are connected to each other. Further, in the figure, 240 is a power source as a power supply source.

Next, the overall operation of the apparatus 1 will be explained according to the flowchart shown in FIG.

The optical sensor 101 detects that the stencil paper S (original) is set on the stencil paper setting board 100 (step 501), and the number of prints setting information, the printing speed setting key 5d and When the print speed and print density are input and set using the print density setting key 5e, the respective setting information is stored in the RA.
are stored in respective areas of M220 (step 50).
2.503.504), which is one of the conditions for Shun's printing process.

Next, when the print start key 5b is pressed (step 5
05 Portrait), the clamp mechanism 21 is activated based on a command from the CPU 200, used for the previous printing, and the plate cylinder 2
The stencil paper S wrapped around the plate cylinder 20 is released from the clamped state, and the plate cylinder 20 is
It is peeled off from the outer circumferential surface of the plate and discarded in a plate disposal box (not shown) (step 506).

Next, the conveyance roller drive motor 102M is driven by a command from the CPU 200, so that the conveyance roller 102
is rotationally driven, and the stencil paper S is conveyed to the clamp mechanism 21. When the leading edge of the stencil paper S reaches the clamp mechanism 21, the optical sensor 90 detects this fact, and when the detection signal is transmitted to the CPU 205, the CPU 200 issues a command to clamp the leading edge of the stencil paper S. Clamp mechanism 2
Send for 1. Therefore, one side edge of the stencil paper S is clamped by the clamp mechanism 21.

Thereafter, in response to a command from the CPU 200, the plate cylinder driving motor 33 is driven to rotate the plate yA20 counterclockwise in the figure, and the stencil paper S is wound around the outer peripheral surface of the plate cylinder 20 (step 507).

In the next step 508, printing processing is performed based on the print number setting information, print speed setting information, and print density setting information stored in the RAM 220. In this printing process, the plate cylinder driving motor 33 that rotationally drives the plate cylinder 20 is controlled based on the printing speed setting information stored in the RAM 220, and the printing paper is transferred to the plate cylinder 20 according to the printing speed. The pressing force of the press roller 40 that presses the is controlled based on print density setting information stored in the RAM 220. In other words, CPU2
00 controls the power supply circuit 230 based on the print density setting information stored in the RAM 220 to operate the solenoid device 4.
Determine the voltage applied to 1 and 0. Therefore, the second
When the printing density is set to a darker direction using the printing intensity setting key 5d shown in the figure, the applied voltage supplied to the solenoid device 41 increases correspondingly, and as a result, the pressure of the press roller 40 to the plate cylinder 20 increases. The pressure contact force increases and the printing density increases.

On the other hand, when the printing density is set toward a lower value, the applied voltage supplied to the solenoid device 41 becomes smaller, and as a result, the pressing force of the press roller 40 against the plate f120 becomes smaller.

Based on the information stored in the RAM 220 as described above, the plate cylinder 20. The press roller 40 is driven, the paper feed mechanism 60, the squeegee roller 36, etc. are operated, and printing is performed (step 508).

Next, the CPU 220 determines whether or not the number of printed sheets P of which printing has been completed has reached the set number of print sheets. Here, when the set number of prints is reached (step 501), the printing process ends. On the other hand, if the set number of prints has not been reached (step 509 negative>, the CPU 200
First, it is checked that the print S degree has not been changed by operating the print density setting key 5d on the operation panel 5 (step 510, negative), and the next printing process is performed under the previous printing conditions (step 508). ).

On the other hand, if the print density has been changed (step 51
0 portrait), the print density setting information stored in the RAM 220 is changed to the changed print density setting information (step 510t!, step 511). Therefore, in the subsequent printing process, when the press roller 40 is driven and pressed against the plate cylinder 20, the solenoid device 41 is connected to the power supply circuit 230.
The applied voltage supplied to is supplied according to the changed print density setting information. Thereafter, each time the print density is changed by operating the print density setting key 5d, the above process is performed, and the applied voltage to the solenoid device 41 is changed, thereby increasing the pressing force of the press roller 40 against the plate Fg420. Be changed. That is, the plate 1j of the press roller 40
By changing the pressing force to 120, the printing density on the printing paper P will be changed.

[Brief explanation of drawings]

FIG. 1 is an external view of a stencil printing device to which this invention is applied;
FIG. 2 is an explanatory view showing the operation panel of the above device, FIG. 3 is an overall schematic view showing the internal structure of the above device, FIG. 4 is an overall perspective view showing the press solenoid device in the stencil device according to the invention, and FIG. FIG. 5 is an explanatory diagram showing the state before voltage is applied to the solenoid device constituting the press solenoid device, FIG. 6 is an explanatory diagram showing the state after voltage is applied to the solenoid device, and FIG. 7 is the stencil printing described above. FIG. 8 is a block diagram showing the electrical components of the apparatus, and a flowchart showing the overall operation of the stencil printing apparatus. 1... Stencil printing device 20... Plate cylinder 400... Press solenoid device 40... Press roller 50... Lever element (supporting member) 41... Solenoid device 41S... Solenoid 59 Actuator B Movable block S Stencil paper patent applicant Riso Kagaku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 8

Claims (1)

[Claims] (1) A cylindrical elastic press roller for pressing the printing paper against the stencil paper wrapped around the outer periphery of the cylindrical plate cylinder, a support member rotatably supporting both longitudinal ends of the press roller, and a case. a solenoid device having a solenoid disposed therein and an actuator disposed so as to be protruded to the outside of the case by a biasing force corresponding to a voltage applied to the solenoid; and a movable block, the other of which is connected to the support member, for propagating the biasing force of the solenoid to the press roller; 1. A press solenoid device for a stencil printing apparatus, characterized in that a press roller is brought into contact with the plate cylinder.