JPH05221108A - Plate making printing device - Google Patents

Abstract

PURPOSE:To enable wind to be performed around a plate making or plate trunk by imparting the optimum tension to original paper at all times in a plate making printing device in which the original paper delivered from a roller is subjected to plate making and subsequently wound around a plate trunk for effecting printing. CONSTITUTION:On both ends of a roller 1, flanges 20, 21 are provided. On a shaft 34 secured in a housing part 30 of the roller 1, a guide flange 36 is arranged via a one-way clutch 35 and a spring 37. At the outside of the shaft 34, a rotating damper 41 is link-connected thereto via a gear 40. The left flange 21 of the roller 1 is link-connected to the guide flange 36 and the right flange 20 is supported rotatably by a guide case 33 of the housing part 30. When original paper is pulled out and the roller 1 rotates, the rotating damper 41 rotates via the guide flange 36 and shaft 34, and rotational torque generates in accordance with a transportation speed of the original paper. In consequence, a tension in accordance with the transportation speed is imparted to the original paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing apparatus capable of carrying out stencil printing by pulling out a stencil printing base paper from a stencil printing base paper roll to make a stencil, and further winding the stencil printing stencil on a plate cylinder. is there.

[0002]

2. Description of the Related Art FIG. 5 shows an example of the overall construction of a conventional plate-making printing apparatus. Stencil roll 1 for stencil printing
The roll (hereinafter, referred to as “roll 1”) is rotatably supported at a predetermined position in the storage section 2. A stencil printing base paper 3 (hereinafter referred to as a base paper 3) pulled out from a roll 1 is nipped and conveyed by a thermal head 4 to which an image signal is supplied and a platen roller 5 provided so as to face the thermal head 4. Heat-sensitive plate making. The plate-making base paper 3 is temporarily stored in the box-shaped stocker 8 by the rollers 6 and 7. Rollers 9 and 10 are provided next to the stocker 8 so that the plate-making base paper 3 stored in the stocker 8 is carried out as needed.

A cutter 11 is provided next to the rollers 9 and 10, and a plate cylinder 13 equipped with a clamp 12 is rotatably provided next to the cutter 11. That is, the plate-making base paper 3 stored in the stocker 8 and used for printing is sent out by the rollers 9 and 10, and the front end thereof is fed to the plate cylinder 1.
It is clamped by the clamp 12 of 3. When the plate cylinder 13 rotates clockwise in the figure, the base paper 3 is transferred to the plate cylinder 1.
3 is wrapped around the outer peripheral surface of the sheet 3, and the cutter 11 cuts the base paper 3 when it is wrapped around the sheet 3 to a predetermined length. During this time, the thermal head 4 is moved to a position away from the platen roller 5 so as not to become a resistance for the base paper conveyance.

Although not shown, a press roller is provided below the plate cylinder 13 so as to face each other, and a paper feed device and a paper discharge device are provided at both positions before and after sandwiching the plate cylinder 13, respectively. The printing paper supplied by the paper feeding device is sandwiched and conveyed between the plate cylinder 13 and the press roller for printing, and is peeled off from the plate cylinder 13 by the paper ejection device and ejected to a predetermined position.

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

That is, the leaf spring 15 is brought into contact with the flange with a predetermined force to resist the rotation of the roll 1,
A predetermined tension can be generated on the base paper 3 pulled out from the roll 1.

[0007]

According to the roll tensioning mechanism in the conventional plate-making / printing apparatus, the leaf spring 15 for generating tension in the base paper is provided in the accommodating portion 2, so the roll 1 is replaced. Leaf spring 1
It is difficult for 5 to deform and maintain the original shape. Therefore, there is a problem that the tension generated in 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 plate cylinder 13 is wrinkled.
There is a possibility that the image may be wound around, and thus 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 conveyance due to the pressure contact between the thermal head 4 and the platen roller 5 is increased during plate making. Another problem has arisen in that a contracted image is plate-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 is different from the tension of the base paper suitable for winding on the plate cylinder, and the tension given to the base paper can be changed. It would be convenient.

In view of the above, the present invention solves the above-mentioned problems of the conventional apparatus, enables stable feeding of the base paper, and conveys the base paper according to the type of operation such as plate making or winding around the plate cylinder. It is an object of the present invention to provide a plate-making printing apparatus that can apply optimum tension.

[0011]

A stencil printing machine according to the present invention draws out and conveys a stencil printing base paper from a stencil printing base paper roll rotatably supported at a predetermined position, and makes the stencil printing base paper. Together with the stencil printing paper, the stencil printing paper is wound around a plate cylinder to perform stencil printing, and a tension applying means for changing the rotational torque according to the transport speed of the stencil printing paper is used. The feature is that it is interlocked with the rotation of the roll.

[0012]

When the plate is made, the rotational speed of the base paper is low and the rotational torque of the roll is relatively small, and the tension applied to the drawn base paper is kept small, so that a good image is made.
When the base paper is wound around the plate cylinder, the rotational speed of the roll is relatively large because the base paper is conveyed at a high speed, and the tension generated in the base paper becomes large. Therefore, the base paper is wound around the plate cylinder without wrinkles.

[0013]

Embodiments The construction of the plate making section and the printing section in the plate making printing apparatus of this embodiment is the same as the conventional one, and the explanation thereof is omitted. The rotation support mechanism and the tension applying mechanism of the roll 1, which are the features of this embodiment, will be described with reference to FIGS.

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

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

As shown in FIG. 1, the storage portion 30 for storing the roll 1 includes a case 31, a damper unit 32 provided on one side plate 31a of the case 31, and a side plate 31b on the other side of the case 31. Guide case 33 provided
And have.

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 projects 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 only when rotating in the front direction in FIG. 1 with respect to the shaft 34,
Rotational force can be transmitted to the shaft 34. Also,
The guide flange 36 is axially movable, 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, it is biased 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 which is inserted into an opening of a cylindrical portion 23 provided on the left flange 21 of the roll 1. Further, a protrusion 39 that engages with the hole 24 of the left flange 21 is provided around it.

As shown in FIGS. 1, 2 and 4, a gear 40 is attached to the other end of the shaft 34 protruding outside the side plate 31a of the case 31. The damper unit 32 includes the rotary damper 4 that contains viscous oil inside.
1 is provided as a tension applying means for the base paper, and the input shaft of the rotary damper 41 is linked to the gear 40.

As shown in FIG. 1, the guide case 33 for supporting the right flange 20 on the roll 1 is the side plate 3 of the case 31.
The protrusion 22 of the right flange 20 is provided on the inner surface of 1b.
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 having the flanges 20 and 21 mounted therein is brought into the case 31, and the tapered portion 38 of the guide flange 36 is engaged with the tubular portion 23 of the left flange 21 by the force of the spring 37. The protrusion 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 1 was mounted on 0.

As shown in FIG. 2, the base paper 3 of the roll 1 is pulled out, sandwiched between the thermal head 4 and the platen roller 5, and conveyed. In the figure, the roll 1 and the flanges 20 and 21 rotate clockwise, and the protrusion 39 of the guide flange 36 engages with the hole 24 of the left flange 21. As a result, the roll 1 and the guide flange 36 are interlockingly connected. Since the square holes 24 are opened every 90 °, the roll 1
Is rotated a quarter turn, 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 to send out the base paper 3.

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

The rotation torque generated by the rotation damper 41 increases as the conveyance speed of the base paper 3 increases. Therefore, the tension generated on the base paper is relatively small during plate making at a low conveyance speed, and a relatively large tension is generated on the base paper when the base paper is conveyed at a high speed and wound around the plate cylinder.

For this reason, according to this embodiment, since the proper tension is always applied to the base paper 3, the plate making is carried out well, and the base paper 3 wound around the plate cylinder is less likely to be wrinkled. 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, since the rotational torque of the roll is changed according to the conveying speed of the base paper, normal perforation is not caused when the base paper is conveyed during plate making without causing unnecessary wrinkles. Image can be formed,
An excellent printed image can be obtained by winding the plate-making base paper around the plate cylinder without wrinkles.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a side view of an embodiment.

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

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

FIG. 5 is a diagram showing an overall 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]

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

Claims (1)

[Claims] 1. A stencil printing base paper is pulled out from a stencil printing base paper roll rotatably supported at a predetermined position and conveyed,
In a stencil printing apparatus that performs stencil printing by making the stencil printing base paper on a plate cylinder while making the stencil printing base paper, the rotational torque changes according to the transport speed of the stencil printing base paper. A plate-making printing apparatus characterized in that a tension applying means is interlocked with the rotation of the stencil printing roll.