JP3342098B2 - Paper positioning device for press-type stencil printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper positioning device for a press-type stencil printer.

[0002]

2. Description of the Related Art A stencil sheet support for supporting a stencil sheet and a printing sheet table on which a printing sheet is placed are provided. A first position at which the printing sheet table is pressed against the stencil sheet section is provided. The printing paper placed on the printing paper placing table is provided so as to be movable between a second position separated from the stencil sheet supporting portion, and the printing paper placing table is located at the first position. A press-type stencil printing apparatus for performing stencil printing on the stencil sheet has already been proposed by the same applicant as the present applicant (Japanese Patent Application No. 4-142306).

[0003]

In order for stencil printing to be performed at a predetermined position on a printing paper, the printing paper must be positioned and mounted at a predetermined position on a printing paper mounting table. If the printing is not performed properly, the print image positions will not be aligned depending on the printing paper. In particular, in the case of multi-plate printing in which stencil printing is repeated a plurality of times on one printing sheet for color printing or the like, high positioning accuracy of the printing sheet on the printing sheet mounting table is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems. In a press-type stencil printing machine, the positioning of printing paper on a printing paper mounting table can be reliably and accurately performed by a simple configuration. It is an object of the present invention to provide a sheet positioning device for performing the operation.

[0005]

According to the present invention, there is provided a stencil sheet support for supporting a stencil sheet, and a printing sheet table on which a printing sheet is placed. A mounting table is movably provided between a first position pressed against the stencil support portion and a second position separated from the stencil support portion, and the printing paper mounting table is located at the first position. In a sheet positioning device of a press-type stencil printing apparatus that performs stencil printing with the stencil sheet on printing paper placed on the printing paper placement table by being positioned, the printing sheet is fixedly arranged on one side of the printing paper placement table. A sheet positioning reference fence portion, and the other side of the printing sheet placing table, the sheet positioning reference fence portion being opposed to the sheet positioning reference fence portion so as to be movable in a direction of coming into contact with and separating from the sheet positioning reference fence portion. A movable positioning lever that presses the printing paper on the printing paper mounting table against the paper positioning reference fence by displacing to the reference fence is biased toward the paper positioning reference fence. A spring means, provided on the printing paper mounting table, wherein the printing paper mounting table is located at the second position, whereby the movable positioning lever is moved from the paper positioning reference fence portion against the urging force of the spring means. And a cam means for displacing the stencil printing apparatus away from the stencil printing machine.

According to another aspect of the present invention, there is provided a paper positioning apparatus for a press-type stencil printing apparatus, comprising: a stencil support portion for supporting a stencil; and a printing paper mounting table on which printing paper is mounted. Having a vertically inclined state, the printing paper mounting table is movably provided between a first position pressed against the stencil support portion and a second position separated from the stencil support portion, A sheet positioning device for a press-type stencil printing apparatus that performs stencil printing with the stencil sheet on a printing sheet placed on the printing sheet placing table by positioning the printing sheet placing table at the first position; A movable gate member for selectively receiving printing paper is movably provided at an inclined lower end of the mounting table, and a paper receiving piece of the movable gate member has a circular arc surface concentric with the rotation center of the movable gate member. It is characterized in that it is.

[0007]

According to the above construction, the movable positioning lever is moved from the paper positioning reference fence by the cam means in a state where the printing paper mounting table is located at the second position separated from the stencil support. It is located at a position away from the printing paper mounting table away from the printing paper mounting table. In this state, the printing paper is mounted on the printing paper mounting table without being disturbed by the movable positioning lever. In the process of moving the printing paper mounting table from the second position to the first position pressed against the stencil support, the movable positioning lever is displaced by the spring means toward the paper positioning reference fence. As a result, the printing paper on the printing paper mounting table is pressed against the paper positioning reference fence, and the positioning of the printing paper on the printing paper mounting table is performed door-to-door based on the paper positioning reference fence.

Further, since the sheet receiving piece of the movable gate member is formed in an arc surface concentric with the center of rotation of the movable gate member, the rotation of the movable gate member causes the sheet receiving piece to print on the printing paper mounting table by the sheet receiving piece. The paper receiving position does not change.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of the present invention.

FIGS. 1 to 3 show an embodiment of a press-type stencil printing machine provided with a paper positioning device according to the present invention. In these figures, reference numeral 1 denotes a box-shaped casing, and an upper cover 3 is provided on an upper portion of the casing 1 so as to be opened and closed by a hinge mechanism not shown.

The upper cover 3 is rigidly fixedly connected to the casing 1 at a closed position as shown by a lock mechanism (not shown). A stencil support bar 5 for exchangeably holding the stencil pad S is provided on the lower bottom surface of the upper cover 3, and the lower bottom surface of the upper cover 3 serves as a flat stencil support portion 7 as a back pressure receiving surface. No. The stencil sheet support portion 7 may be provided with a sponge sheet 9 as a back cushion member.

For example, a stencil paper pad is disclosed in
As shown in Japanese Patent No. 32007, the stencil sheet includes a frame, a stencil sheet stably supported by the frame body, and a cover sheet attached to the frame so as to be openable and closable. It may be of a type in which a viscous printing ink is disposed therebetween.

The casing 1 is made up of legs 2 as shown in FIGS.
As shown in FIG. 1, the paper inlet A is formed on the upper side and the paper outlet B is formed on the lower side in cooperation with the upper cover 3.

At four corners in the casing 1, guide columns 11 extending vertically are fixedly arranged. A printing paper mounting table 15 is vertically movably engaged with the guide column 11 by a guide sleeve 13. The printing paper mounting table 15 is moved downward and away from the stencil support portion 7 as shown in FIGS. As shown in FIG.
Is movable in parallel with a raised position (first position) pressed against the first position.

The printing paper mounting table 15 has a printing paper mounting surface portion 17 facing the stencil paper support portion 7 in parallel, and the printing paper P is adhered to the printing paper mounting surface portion 17 with adhesiveness. The adhesive sheet 19 to be held is laid, and a peeling plate 21 for peeling off the printing P stuck on the upper surface of the adhesive sheet 19 is provided so as to be able to come and go. The stencil paper support 7 and the printing paper mounting surface 17 are both vertically inclined by the inclined arrangement of the casing 1 as shown in FIGS.

The pressure-sensitive adhesive sheet 19 is made of a pressure-sensitive adhesive resin material such as a polyurethane resin having a pressure-sensitive property, a pressure-sensitive adhesive rubber material, and the like. Please refer to.

The peeling plate 21 is urged upward from a spring means (not shown), that is, in a direction protruding above the upper surface of the adhesive sheet 19, so that the printing paper placing surface 17 is pressed against the stencil support 7. In a state where the adhesive sheet 19 is not removed, it projects upward from the upper surface of the adhesive sheet 19 and
Is immersed in the groove 23 of the printing paper placing surface 17 in response to being pressed against the stencil support 7. The peeling plate 21 extends in the up-down direction of the printing paper placing surface portion 17, and in a state where the printing paper placing surface portion 17 is in the protruding position, the stripping plate surface of the printing paper P to be put on the printing paper placing surface portion 17 from the paper inlet A. Eggplant

The release plate 21 is inserted from the paper inlet A onto the printing paper mounting surface 17 so that the printing paper P heading from the printing paper mounting surface 17 to the paper outlet B is not caught at the end. As shown in FIG.
Both a and 21b are inclined surfaces, and both upper side edges are chamfered so that the printing paper P slides down with low resistance.

A motor 27 having a speed reducer as a rotary actuator is fixedly mounted on a fixed bottom plate 25 in the printing paper mounting table 15. One end of a crank arm member 31 is fixedly attached to the output rotation shaft 29 of the motor 27, and the crank arm member 31 pivotally supports an intermediate portion of the first link member 35 by a pin 33 at the other end. . One end of a second link member 39 is pivotally connected to one end of the first link member 35 by a pin 37, and the second link member 39
Is pivotally connected to the printing paper mounting table 15 by a pin 41 at an intermediate portion.

A compression coil spring 43 is mounted between the other end of the first link member 35 and the second link member 39 and the other end so as to connect them. The compression coil spring 43 moves the other end sides of the first link member 35 and the second link member 39 apart from each other, in other words, the first link member 3.
5 and the second link member 39 around the pin 37 in FIG.
, And the relative rotational displacement between the first link member 35 and the second link member 39 in this direction is caused by the stopper projecting piece provided on the second link member 39. The maximum amount is defined as shown in FIG. 1 by the contact of 45 with the end face of the first link member 35.

An upper limit detection limit switch 47 is attached to the other end of the first link member 35. The upper limit detection limit switch 47 is connected to the second link member 39.
Has an actuator lever 51 facing the tip of the extension piece 49 provided at the other end of the compression coil spring 4.
The actuator lever 51 is pushed by the extension piece 49 because the first link member 35 and the second link member 39 are relatively rotated and displaced in a direction approaching each other against the spring force of 3. As a result, the contact is switched to detect the upper limit movement of the printing paper mounting table 15.

A lower limit detection limit switch 53 is attached to the first link member 35. The lower limit detection limit switch 53 is such that the printing paper table 15 is
When the actuator lever 55 is pressed by a switch operation bar 57 attached to the fixed bottom plate 25 in a state where the printing paper table 15 is located at the lower position as shown in FIG. Detect movement.

A sheet positioning reference fence 59 is fixedly disposed integrally with the casing 1 on the left side of the printing sheet mounting table 15 in FIG. A bracket 61 fixed to the fixed bottom plate 25 is on the right side of the printing paper mounting table 15 in FIG.
The movable positioning lever 65 is attached to the paper positioning reference fence 59 by a pivot 63 so as to be rotatable.

The movable positioning lever 65 has a positioning surface 67 positioned above the printing paper mounting surface 17 of the printing paper mounting table 15 at the lowered position and facing the paper positioning reference fence 59. The printing paper P on the printing paper mounting table 15 is pressed against the paper positioning reference fence 59 by the positioning surface 67 by rotating and displacing in the counterclockwise direction at 1. In addition, a concave portion 69 for receiving the positioning surface portion 67 is provided on a side portion of the printing paper mounting table 15.

A torsion spring 71 is provided around the pivot 63, and the torsion spring 71 is
Is urged toward the paper positioning reference fence 59, that is, counterclockwise in FIG.

A cam projection 73 having a triangular shape is formed on the side of the printing paper mounting table 15, and the movable positioning lever 65 is driven by a cam including a concave portion 77 having a triangular concave surface facing the cam projection 73. The cam driven surface portion 79 is pressed against the cam projection 73 by the spring force of the torsion spring 71.

The movable positioning lever 6 is moved by the cam means.
Reference numeral 5 denotes a sheet positioning reference fence 59 against the spring force of the torsion spring 71 when the printing sheet mounting table 15 is located at the lowered position as shown by a solid line in FIG. The cam projection 73 engages with the recess 77 as shown by the imaginary line in FIG. 1 while the printing paper mounting table 15 is moved from the lowered position to the elevated position, which is located at the retracted position that has moved away. By doing so, the pushing to the retreat position is released, and the printing paper P on the printing paper mounting table 15 is pressed to the paper positioning reference fence 59 by the spring force of the torsion spring 71 and positioned at the positioning action position. When the printing paper mounting table 15 further moves upward in this state, the cam projection 73 is disengaged from the engagement with the concave portion 77, and the movable positioning lever 65 returns to the original retracted position.

A movable gate member 83 is rotatably attached to the printing paper mounting table 15 by a pivot 81. The movable gate member 83 is formed in a staple shape, extends on both sides of the printing paper mounting table 15, and has a pair of arms 85 supported by the printing paper mounting table 15 by the pivot 81 and a paper outlet of the printing paper mounting table 15. A sheet receiving piece 87 extending along the B side, that is, along the end on the lower side of the inclination, is rotated by the movable gate member 83 about the pivot 81 so as to be solid line in FIG. The gate action position protruding upward from the upper surface of the peeling plate 21 at the protruding position as shown by the arrow, and the retracted position sinking below the upper surface of the printing paper mounting table 15 as shown by the phantom line in FIG. Move up and down in between. The paper receiving piece 87 has an arc surface centered on the pivot 81, and always maintains a constant paper receiving position irrespective of movement between the gate operation position and the retracted position.

The movable gate member 83 is urged counterclockwise around the pivot 81 by a spring 89. A solenoid device 91 is attached to the printing paper mounting table 15, and a plunger 93 of the solenoid device 91 is
5 is drivingly connected to the movable gate member 83. When the solenoid device 91 is not energized, the movable gate member 83
Can freely move between the gate operation position and the retreat position, and the printing paper placing table 15 is located at the raised position, whereby the movable gate member 83 is moved to the position where it is pushed down as shown in FIG. The position causes the plunger 93 to enter a stroke range in which magnetic attraction is possible, and drives the movable gate member 83 to the retracted position against the spring force of the spring 89 only when electricity is supplied in this state. Therefore, even if the solenoid device 91 is energized by mistake while the movable gate member 83 is located at the gate operation position, the movable gate member 83 will not be driven to the retracted position.

Further, a mylar film 97 may be provided at the paper exit B so that the printing paper P can smoothly travel from the printing paper mounting table 15 to the paper exit B.

FIG. 4 shows a control system of the press-type stencil printing apparatus according to the present invention. This control system includes a CPU 101,
ROM 103 storing a system program, RAM 105 serving as a work memory and the like, timer circuit 107
, An input port circuit 109, and a drive circuit 111 for the motor 27. The input port circuit 109 includes an upper limit detection limit switch 47, a lower limit detection limit switch 53, and a power switch 11 provided on the casing 1.
3 and a print switch 115 provided on the cover 3
Then, a signal is input from each of the paper sensors 117 for detecting that the printing paper P is loaded on the printing paper loading table 15.

Next, the operation of the press-type stencil printing machine having the above-described configuration will be described with reference to the flowchart of FIG.

First, when the power switch 113 is turned on,
When the initialization process is performed and the printing paper mounting table 15 is not located at the lowering position, the printing paper mounting table 15 is moved by the motor 27 in the lowering direction, and the lower limit detection limit switch 53 is set.
(Step 1)
0-40). After that, the printer is in a state of waiting for an ON signal from the print switch 71 (step 50).

The printing paper P is loaded onto the release plate 21 of the printing paper mounting table 15 from the paper inlet A in a state where the printing paper mounting table 15 is located at the lowered position. The printing paper P falls freely on the peeling plate 21 and is received by the paper receiving piece portion 87 of the movable gate member 83 located at the gate action position, as shown in FIG.
5 is positioned in the inclined falling direction.

When the print switch 71 is turned on in this state, the paper sensor 117 is turned on.
That is, it is confirmed that the printing paper P is mounted on the release plate 21 of the printing paper mounting table 15 (Step 6).
0). If the paper sensor 117 is on, the motor 27
, The motor 27 is driven in the ascending direction, and a timer is set at the start of the motor drive (step 80).

When the motor 27 is driven in the upward direction, the crank arm member 31 is rotated clockwise in FIG. 1 around the output rotation shaft 29, and this rotation causes the first link member 35 and the second link member to rotate. The entirety of the compression coil spring 39 and the compression coil spring 43 moves upward with the initial relative positional relationship, and the printing paper mounting table 15 moves upward while being guided by the guide columns 11 due to the upward movement.

While the printing paper mounting table 15 is moving from the lowered position to the raised position, the cam projection 73 engages with the recess 77 as shown by the phantom line in FIG. The pushing of the positioning lever 65 to the retracted position is released, and the movable positioning lever 65 rotates counterclockwise in FIG. 1 by the spring force of the torsion spring 71, and the printing paper P on the printing paper mounting table 15 is rotated. Is pressed against the sheet positioning reference fence 59.
Thereby, the horizontal positioning of the printing paper P on the printing paper mounting table 15 is performed in a door-stop manner with reference to the paper positioning reference fence 59.

In this state, when the printing paper mounting table 15 further moves upward, the cam projection 73 is disengaged from the engagement with the concave portion 77, so that the movable positioning lever 65 returns to the original retracted position, and the printing paper P Leave.

The printing paper P on the printing paper mounting table 15 comes into contact with the stencil paper pad S mounted on the base paper supporting portion 7 by the upward movement of the printing paper mounting table 15, and the printing paper mounting table 15 subsequently moves upward. As a result, the peeling plate 21 is pushed down, and the printing paper P on the printing paper mounting table 15 comes to adhere to the adhesive sheet 19. In this state, the printing paper mounting table 15 is pressed against the stencil paper pad S of the stencil support portion 7 with the printing paper P interposed therebetween, and stencil printing is performed in a pressing manner. At this time, the movable gate member 83 is pushed down as shown in FIG. 3 by the sheet receiving piece portion 87 abutting on the stencil sheet pad S. Movable gate member 83
Is pressed down, the paper receiving piece 87 is
, The position at which the sheet is received by the sheet receiving piece 87 does not change, and high positioning accuracy is maintained.

When the pressing force of the printing paper mounting table 15 against the base paper supporting portion 7 reaches a predetermined value and the printing paper mounting table 15 is still driven in the upward direction, the first link member 35 causes the compression coil spring 43 to move. While being compressed and deformed, the second link member 39 is rotated counterclockwise with respect to the pin 37 around the pin 37 in the drawing, and the rotational displacement causes the actuator lever 51 of the upper limit detection limit switch 47 to rotate.
Is pushed by the extension piece 49, and the upper limit detection limit switch 47 is turned on.

While the motor 27 is being driven in the upward direction, the turning on of the upper limit switch 51 and the timer value are monitored in parallel, and whether the upper limit switch 51 is turned on as described above (step 80) or the timer value is When the set value is reached and the time is over (step 90), the driving of the motor 27 in the upward direction is stopped (step 10).
0). When the drive in the upward direction of the motor 27 is stopped, a timer is set (step 100), and the pressed state is maintained for several seconds. The press maintaining time may be variably set by the user for adjusting the print density.

When the pressed state is maintained for several seconds (step 110), the motor 27 is energized, and the motor 27 is driven in the descending direction and the solenoid 91 is energized (step 120). This solenoid 9
At the start of energization to the first position, the movable gate member 83 is pushed down as shown in FIG.
The movable gate member 83 is driven to the retracted position against the spring force of the spring 89, and the movable gate member 83 is held at the retracted position.

When the motor 27 is driven in the descending direction, the crank arm member 31 rotates counterclockwise in FIG. 1 around the output rotation shaft 29, and the first link member 35 and the second link member 39 are compressed. The entire coil spring 43 and the printing paper mounting table 15 move down. When the printing paper mounting table 15 returns to the original lowered position by this lowering movement, the actuator lever 55 of the lower limit detection limit switch 53 is pushed by the switch operation bar 57 to be turned on (step 13).
0), the driving of the motor 27 in the descending direction is stopped (step 140).

When the printing paper mounting table 15 moves down, the printing paper P on the printing paper mounting table 15 is separated from the stencil sheet pad S by being stuck to the adhesive sheet 19,
Thereafter, the peeling plate 21 returns to the original projecting position and is peeled from the adhesive sheet 19, and at this time, the movable gate member 8
Since 3 is held at the retracted position by the solenoid device 91, the sheet 3 slides to the sheet exit B and is discharged.

When the printing paper P is separated from the printing paper mounting table 15, the paper sensor 117 is turned off (step 150).
When a predetermined time elapses for safety (step 160), energization of the solenoid device 91 is stopped (step 170). Thereby, the movable gate member 83
Returns to the original gate action position by the spring force of the spring 89,
It waits for the next printing operation.

[0046]

As will be understood from the above description, according to the paper positioning device of the press type stencil printing apparatus according to the present invention, the printing paper on the printing paper mounting table is pressed against the paper positioning reference fence by the movable positioning lever. The positioning of the printing paper on the printing paper mounting table is performed in a door-stop manner with reference to the paper positioning reference fence portion, and the paper receiving piece of the movable gate member is an arc concentric with the rotation center of the movable gate member. As a result, the receiving position of the printing paper on the printing paper mounting table by the paper receiving piece does not change due to the rotational displacement of the movable gate member. The simple positioning in the horizontal and vertical directions can be performed reliably and with high accuracy. As a result, the print image positions on each printing paper can be aligned with high precision, and high quality with high positional precision can be achieved especially in the case of multi-plate printing in which stencil printing is repeated a plurality of times on one printing paper for color printing or the like. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an initial state of an embodiment of a press-type stencil printing machine provided with a paper positioning device according to the present invention.

FIG. 2 is a side sectional view showing an embodiment of a pressing type stencil printing machine provided with a paper positioning device according to the present invention in an initial state.

FIG. 3 is a side cross-sectional view showing a press-completed state of a press-type stencil printing machine provided with a paper positioning device according to the present invention.

FIG. 4 is a block diagram showing one embodiment of a control system of a press-type stencil printing machine provided with a paper positioning device according to the present invention.

FIG. 5 is a flowchart showing the operation of the press-type stencil printing machine provided with the paper positioning device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 3 Top cover 7 Stencil support part 15 Printing paper mounting table 27 Motor 31 Crank arm member 59 Paper positioning reference fence part 65 Movable positioning lever 71 Torsion spring 71 73 Cam projection part 79 Cam driven surface part 83 Movable gate member 87 Paper receiving One part 91 solenoid device

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41L 13/02 B41K 3/46

Claims (2)

(57) [Claims] 1. A stencil support section for supporting a stencil sheet, and a printing sheet mounting table on which a printing sheet is placed, wherein the printing sheet mounting table is pressed against the stencil sheet support section at a first position; The printing paper placed on the printing paper placing table is provided so as to be movable between a second position separated from the stencil sheet supporting portion, and the printing paper placing table is located at the first position. In a sheet positioning device of a press-type stencil printing apparatus that performs stencil printing with the stencil sheet, a sheet positioning reference fence portion fixedly arranged on one side of the printing sheet table, and the other side of the printing sheet table. The paper positioning reference fence is opposed to the paper positioning reference fence so as to be movable toward and away from the paper positioning reference fence, and the mark is displaced toward the paper positioning reference fence. A movable positioning lever for pressing the printing paper on the paper mounting table against the paper positioning reference fence, spring means for urging the movable positioning lever toward the paper positioning reference fence, and provided on the printing paper mounting table. Cam means for displacing the movable positioning lever to a side away from the paper positioning reference fence portion against the urging force of the spring means when the printing paper mounting table is located at the second position. A sheet positioning device for a press-type stencil printer. 2. A stencil support section for supporting a stencil sheet and a printing sheet support table on which printing paper is mounted are vertically inclined, and the printing sheet support table is pressed against the stencil support section. The printing paper mounting table is movably provided between a first position and a second position separated from the stencil sheet support portion, and is mounted on the printing paper mounting table by the printing paper mounting table being located at the first position. In a paper positioning device of a press-type stencil printing apparatus that performs stencil printing on the placed printing paper with the stencil sheet, a movable gate member that selectively receives the printing paper at an inclined lower end of the printing paper mounting table is movable. Provided as possible,
A sheet positioning device for a press-type stencil printing machine, wherein a sheet receiving piece of a movable gate member has an arc surface concentric with a rotation center of the movable gate member.