JP3032367B2 - Plate making and printing equipment - 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 capable of drawing a stencil sheet from a stencil sheet roll, making a stencil sheet, and winding the stencil sheet around a printing drum for stencil printing. is there.

[0002]

2. Description of the Related Art FIG. 5 shows an example of the entire configuration of a conventional plate-making printing apparatus. Stencil roll 1
The roll 1 is rotatably supported at a predetermined position in the storage unit 2. The stencil sheet 3 (hereinafter referred to as the stencil sheet 3) drawn from the roll 1 is nipped and conveyed by a thermal head 4 to which an image signal is supplied and a platen roller 5 provided opposite to the thermal head 4. The plate is made with heat. The pre-processed base paper 3 is temporarily stored in a box-shaped stocker 8 by rollers 6 and 7. Rollers 9 and 10 are provided next to the stocker 8 so that the stencil sheet 3 that has been made and stored in the stocker 8 can be carried out as needed.

A cutter 11 is provided next to the rollers 9 and 10, and a plate cylinder 13 having a clamp 12 is rotatably provided next to the cutter 11. That is, the prepressed stencil sheet 3 stored in the stocker 8 and sent for printing is sent out by the rollers 9 and 10, and the leading end thereof is applied to the plate cylinder 1.
3 clamp 12. When the plate cylinder 13 rotates clockwise in FIG.
The cutter 11 cuts the base paper 3 when it is wound around the outer peripheral surface of the base paper 3 and is wound to a predetermined length. During this time, the thermal head 4 has been moved to a position away from the platen roller 5 so as not to cause resistance of the transport of the base paper.

Although not shown, press rollers are provided below the plate cylinder 13 so as to face each other, and a paper feeder and a paper discharge device are provided at both positions before and after the plate cylinder 13 are sandwiched. The printing paper supplied by the paper feeding device is nipped and conveyed by the plate cylinder 13 and the press roller to be printed, peeled off from the plate cylinder 13 by a paper discharging device, and discharged to a predetermined position.

FIGS. 6 and 7 show a rotation supporting mechanism and a tension applying mechanism of the roll 1 in the above-described plate-making printing apparatus. The roll 1 is formed by winding a base paper 3 around a paper cylinder 14, and has a pair of flanges at both ends. The roll 1 is moved to the storage section 2 through these flanges.
It is supported rotatably. A pair of leaf springs 15, 15 are provided at the bottom of the storage section 2, and these leaf springs 15, 15 are in contact with the outer peripheral surfaces of the pair of flanges with a predetermined elastic force.

That is, by bringing the leaf spring 15 into contact with the flange with a predetermined force, resistance is given to the rotation of the roll 1,
A predetermined tension can be generated in the base paper 3 pulled out from the roll 1.

[0007]

According to the roll tension applying mechanism in the conventional plate-making printing apparatus, since the leaf spring 15 for generating tension on the base paper is provided in the storage section 2, the roll 1 is replaced. The leaf spring 1
It is difficult to maintain the original shape due to deformation of 5. For this reason, there has been a problem that the tension generated on the base paper 3 is not stable.

Further, since the base paper 3 is conveyed at a high speed when it is wound around the plate cylinder 13, the wrinkle is generated in the plate cylinder 13.
, And a good image may not be obtained at the time of printing. If the tension generated by the leaf spring 15 is increased in order to solve such a problem, the resistance of the base paper transport due to the press-fitting of the thermal head 4 and the platen roller 5 at the time of plate making increases, and therefore, the normal image is not displayed. Another problem is that the shrunken image is made on the base paper 3.

In the plate-making printing apparatus as described above, the tension of the base paper suitable for plate-making and the tension of the base paper suitable for winding on the plate cylinder are different, so that the tension applied to the base paper can be changed. It would be convenient.

Accordingly, the present invention solves the above-mentioned problems of the conventional apparatus, and can apply a stable tension to the base paper to convey the base paper, and apply the base paper to the base paper in accordance with the type of operation of making or winding around the plate cylinder. It is an object of the present invention to provide a stencil printing machine capable of applying an optimal tension.

[0011]

SUMMARY OF THE INVENTION A stencil printing apparatus of the present invention draws a stencil printing paper from a stencil printing paper roll rotatably supported at a predetermined position, conveys the stencil printing paper, and forms the stencil printing paper. In addition, in a stencil printing apparatus that performs stencil printing by winding a stencil printing stencil around a plate cylinder, the stencil printing stencil includes a tension applying unit that changes a rotation torque according to a conveyance speed of the stencil printing stencil. It is characterized by being linked to the rotation of the roll.

[0012]

In the plate making operation, the rotation torque of the roll is relatively small due to the slow transfer speed of the base paper, and the tension applied to the drawn base paper is kept small, so that a good image can be made.
When the base paper is wound around the plate cylinder, the rotation speed of the roll is relatively large because the speed of transport of the base paper is high, and the tension generated in the base paper increases. Therefore, the base paper is wound around the plate cylinder without wrinkles.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the plate making section and the printing section in the plate making and printing apparatus of this embodiment is the same as in the prior art, and a description thereof will be omitted. A rotation support mechanism and a tension applying mechanism of the roll 1 which are features of the present embodiment will be described with reference to FIGS.

As shown in FIG. 1, a stencil printing paper roll 1 (roll 1) is made up of a stencil paper 3 (base paper 3) in the form of a continuous sheet and a paper cylinder 14 around which the base paper 3 is wound. It is configured.

As shown in FIG. 1, a paper cylinder 1 of the roll 1 is provided.
Flanges 20 and 21 having different shapes are respectively fitted to both ends of 4. The right flange 20 has a projection 22 at the center.
have. The left flange 21 is provided with a cylindrical portion 23 at the center, and around the cylindrical portion 23, rectangular holes 24 are formed at 90 ° intervals.
Are formed.

As shown in FIG. 1, a storage section 30 in which the roll 1 is stored includes a case 31, a damper unit 32 provided on one side plate 31a of the case 31, and a second side plate 31b of the case 31. Guide case 33 provided
And

As shown in FIGS. 1, 3 and 4, the damper unit 32 has a shaft 34. The shaft 34 is rotatably attached to the side plate 31 a and protrudes inside and outside the case 31. A guide flange 36 to which a one-way clutch 35 is fixed is provided at one end of a shaft 34 protruding into the case 31. That is, the guide flange 36
Is rotated only in the forward direction in FIG.
The rotation force can be transmitted to the shaft 34. Also,
The guide flange 36 is movable in the axial direction, and a spring 37 is interposed between the guide flange 36 and the shaft 34. Therefore, when the guide flange 36 is slid outward in the direction of the shaft 34, the guide flange 36 is urged inward by the elastic force of the spring 37.

As shown in FIGS. 1 and 3, the guide flange 36 has a tapered portion 38 inserted into the opening of the cylindrical portion 23 provided on the left flange 21 of the roll 1. A projection 39 is provided around the periphery of the projection 39 so as to engage with the hole 24 of the left flange 21.

As shown in FIGS. 1, 2 and 4, a gear 40 is attached to the other end of the shaft 34 projecting out of the side plate 31a of the case 31. The damper unit 32 includes a rotary damper 4 containing viscous oil therein.
1 is provided as tensioning means for the base paper, and the input shaft of the rotary damper 41 is connected to the gear 40 in an interlocking manner.

As shown in FIG. 1, a guide case 33 for supporting the right flange 20 on the roll 1 is provided with a side plate 3 of the case 31.
1b, the projection 22 of the right flange 20
And an opening 43 for rotatably supporting the projection 22.

Next, the operation of the above configuration will be described. First, the guide flange 36 is moved to the left in FIG. The roll 1 on which the flanges 20 and 21 are mounted is brought into the case 31, and the tapered portion 38 of the guide flange 36 is engaged with the cylindrical portion 23 of the left flange 21 by the force of the spring 37. The projection 22 of the right flange 20 is inserted into the opening 43 along the inclined portion 42 of the guide case 33. This is storage part 3
Roll 0 was mounted on 0.

As shown in FIG. 2, the base paper 3 of the roll 1 is pulled out, and is conveyed while being held between the thermal head 4 and the platen roller 5. In the figure, the roll 1 and the flanges 20 and 21 rotate rightward, and the projection 39 of the guide flange 36 engages with the hole 24 of the left flange 21. Thereby, the roll 1 and the guide flange 36 are linked and connected. Since the square holes 24 are opened at 90 ° intervals, the roll 1
Is rotated by 1/4, the projection 39 is always engaged with the hole 24.

When plate making or printing is performed in the plate making and printing apparatus, and the base paper 3 is conveyed, the roll 1 rotates and the base paper 3 is sent out.

The rotation of the roll 1 is controlled by a one-way clutch 35.
The rotation of the rotary damper 41 is further transmitted to the shaft 34 via the gear 40. Rotational torque is generated by the resistance of the viscous oil in the rotary damper 41, and this becomes the rotational torque of the roll 1 to generate tension in the base paper 3.

The rotational torque generated by the rotary damper 41 increases as the transport speed of the base paper 3 increases. Therefore, the tension generated in the base paper is relatively small during plate making at a low transport speed, and a relatively large tension is generated in the base paper when the base paper is transported at high speed and wound around the plate cylinder.

For this reason, according to the present embodiment, since the proper tension is always applied to the base paper 3, the plate making is performed well, and the base paper 3 wound around the plate cylinder is hardly wrinkled and has a good quality. A printed image is obtained. Further, even if the roll 1 is repeatedly attached and detached, the tension generated on the base paper 3 does not change.

[0027]

According to the present invention, the rotational torque of the roll is changed in accordance with the speed of transport of the base paper, so that unnecessary wrinkles are not generated when the base paper is transported during plate making, and normal perforation is performed. Images can be formed,
A preprinted base paper can be wound around a plate cylinder without wrinkles to obtain a good printed image.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment.

FIG. 2 is a side view of one embodiment.

FIG. 3 is a partial perspective view of one embodiment.

FIG. 4 is a partially exploded perspective view of one embodiment.

FIG. 5 is a diagram showing an entire configuration of a conventional plate-making printing apparatus.

FIG. 6 is a side view of a roll support mechanism in a conventional plate-making printing apparatus.

FIG. 7 is a cross-sectional view of a roll support mechanism in a conventional plate-making printing apparatus.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 stencil printing paper roll (roll) 3 stencil printing base paper (base paper) 13 plate cylinder 41 rotary damper as tension applying means

Claims (1)

(57) [Claims] 1. A stencil printing paper is drawn from a stencil printing paper roll rotatably supported at a predetermined position and is conveyed.
In a stencil printing apparatus that performs stencil printing by making the stencil sheet for stencil printing, and stencil printing the stencil printing stencil wound around a plate cylinder, the rotational torque changes according to the transport speed of the stencil printing stencil. A stencil printing machine wherein a tension applying means is linked to the rotation of the stencil printing paper roll.