JPH09169156A - Ink supply squeegee device of rotary screen printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correspond to the deterioration of a squeegee or the adjustment of printing density by radidly replacing the squeegee member of an ink supply squeegee apparatus. SOLUTION: This apparatus is constituted so as to supply printing ink to an ink permeable cylindrical plate cylinder 10 having screen stencil paper attached to the outer peripheral surface thereof and rotated around its axial line from the inner peripheral surface thereof. In this case, the support member arranged in the plate cylinder so as to be rotatable with respect to the plate cylinder and a plurality of the squeegee members 34a, 34b extending from the support member to come into contact with the inner peripheral surface of the plate cylinder are provided. The squeegee members 34a, 34b may be squeegee blades or squeegee rollers and they are made different in hardness, material quality, shape and the distance from the center axis line of the plate cylinder to be capable of also regulating printing density by the selection of the squeegee members 34a, 34b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an squeegee device for supplying ink to a rotary stencil printing machine for supplying printing ink to the inner peripheral surface of a plate cylinder of the rotary stencil printing machine.

[0002]

2. Description of the Related Art A rotary stencil printing machine is provided with a cylindrical plate cylinder whose outer peripheral surface has a printing ink passing structure such as a porous structure, and a stencil sheet is locked on the outer peripheral surface of the plate cylinder at the time of printing. It is equipped with a clamper. When printing,
The stencil sheet preliminarily image-punched and made into a plate is wound around the plate cylinder by engaging one end with a clamper, and while rotating the plate cylinder while supplying the printing ink to the inner peripheral surface of the plate cylinder, the printing paper is rotated. In a state of translational movement in synchronism with the plate cylinder, the printing paper is brought into close contact with the plate cylinder with the help of an external roller provided so as to face the plate cylinder, and the printing ink impregnated in the plate cylinder is transferred to the printing paper. By doing so, stencil printing is performed.

In such a rotary stencil printing machine, in order to supply a fixed amount of printing ink to the inner peripheral surface of the plate cylinder, a squeegee which contacts the inner peripheral surface of the plate cylinder at a position facing the outer roller is provided inside the plate cylinder. The device is placed. Then, at the time of printing, the squeegee device and the outer roller press each other, so that the squeegee device presses the inner peripheral surface of the plate cylinder to push the printing ink out of the plate cylinder.

[0004]

The squeegee member which comes into contact with the inner peripheral surface of the plate cylinder of such a squeegee device is usually a squeegee roller which rotates inwardly contacting the inner peripheral surface of the plate cylinder or a plate-like member which comes into sliding contact with the inner peripheral surface of the plate cylinder. Composed of squeegee blades.

However, when a squeegee blade is used as the squeegee member, when printing is performed for a long time, the tip end of the squeegee blade is shaved due to friction with the inner peripheral surface of the plate cylinder and becomes rounded. If the roundness of the tip of this squeegee blade becomes large, the contact time between the printing paper and the plate cylinder increases,
A large amount of printing ink is transferred to the printing paper. As a result, the line on the original becomes thick, the "sharpness" in appearance is lost, and there is a problem such as an increase in set-off. Also,
Even if a squeegee roller is used as the squeegee member,
When printing for a long time, it is inevitable that the roller surface will be scratched or deteriorated.

In order to increase the density of the printed image printed on the printing paper, the squeegee member is slid in a direction away from the central axis of the plate cylinder, that is, so as to push the plate cylinder outward, It may also increase the contact area between the printing paper and the printing paper to increase the amount of printing ink transferred from the plate cylinder to the printing paper. However, when the squeegee member is slidable in this way, the mechanism becomes complicated and the number of parts increases.

Further, by replacing the squeegee member with a different material and hardness, the contact area between the plate cylinder and the printing paper can be changed to change the image density.
In order to replace the squeegee member, the printing press must be disassembled, which is practically impossible under the circumstances of using the printing press.

The present invention has been made by paying attention to the above-mentioned problems in the conventional rotary stencil printing apparatus, and can quickly replace the squeegee member to adjust the deterioration of the squeegee member and the print density. An object of the present invention is to provide a squeegee device that can be used.

[0009]

SUMMARY OF THE INVENTION According to the present invention, the object is to provide an inner peripheral surface of an ink-permeable cylindrical plate cylinder which is mounted on its outer peripheral surface and rotates around its own central axis. In a squeegee device for supplying ink to a rotary stencil printing device that supplies printing ink from a surface, the squeegee device for supplying ink is a support member arranged rotatably with respect to the plate cylinder inside the plate cylinder, and the supporting member. And a squeegee member extending from the squeegee member in contact with the inner peripheral surface of the plate cylinder.

That is, according to the present invention, a squeegee device is constructed by radially supporting a plurality of squeegee members on a support member, and the squeegee device is placed inside the plate cylinder in a state where each squeegee member is in contact with the inner peripheral surface of the plate cylinder. By accommodating and rotatably attaching the support member, the support member can be rotated as necessary so that each squeegee member can be arranged to face an external roller provided outside the plate cylinder. It is characterized in that the squeegee member can be easily replaced.

Thus, according to another aspect of the present invention, an ink-permeable cylindrical plate cylinder having a stencil sheet mounted on its outer peripheral surface and rotating about its own central axis, and an outer peripheral surface of the plate cylinder during printing. A rotary stencil printing machine having an external roller which is circumscribed on the plate cylinder to feed the printing paper while sandwiching it between the plate cylinder and itself, and an ink supply squeegee device arranged so as to contact the inner peripheral surface of the plate cylinder. In the squeegee device for ink supply, a supporting member rotatably arranged with respect to the plate cylinder inside the plate cylinder, and a plurality of squeegee members extending from the supporting member and contacting an inner peripheral surface of the plate cylinder. There is provided a rotary stencil printing apparatus, characterized by comprising:

In the present invention, the squeegee member may be composed of either the above-mentioned squeegee blade or squeegee roller.

Further, in the present invention, each of the plurality of squeegee members may have different shapes, materials, or hardness, which allows the print density to be easily adjusted. Further, in order to adjust the print density, the squeegee members may be arranged at different distances from the central axis of the plate cylinder so that the squeegee members and the plate cylinder come into contact with each other at different pressures. Good.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below with reference to the specific examples shown in the drawings, but the present invention is not limited to these specific examples.

FIGS. 1 and 2 show a specific example in which a squeegee device having two squeegee members is arranged in the plate cylinder 10 according to the present invention, and squeegee blades 34a and 34b are used as the squeegee members. However, a press roller 70 biased toward the plate cylinder 10 is used as an external roller.

1 and 2, the cylindrical plate cylinder 10
Is made of a printing ink permeable material such as a porous metal plate or a mesh structure, and has a clamp 13 on its outer peripheral surface for clamping the end of the stencil sheet at the time of printing. The plate cylinder 10
End support ring bodies 21a and 21b are attached to both end portions of the above to close the both end portions. The end support ring 21
a and 21b are provided with bearings 20a and 20b in the center,
The hollow shaft 11 is inserted into the plate cylinder 10 and the bearing
By supporting the plate cylinder 10 with the hollow shaft 1 by supporting it with 20a and 20b.
It is rotatable relative to 1. This bearing 20
The nominal inner diameters of a and 20b are equal to the outer diameter of the hollow shaft 11, have a structure that does not leak the printing ink inside the plate cylinder 10 to the outside, and support a low load in order to rotate the plate cylinder 10 without difficulty. Those are preferable. Both ends of the hollow shaft 11 are rotatably supported by bearings 56 (the right end is not shown) fixed to the printer main body 57 outside the end support rings 21a and 21b.

Further, large gears 23a and 23b are formed coaxially with the hollow shaft 11 on the outer peripheral surfaces of the annular support ring bodies 21a and 21b, and the large gears 23a and 23b are driven around a shaft 41 by a drive motor (not shown). The drive gears 42a and 42b that are rotationally driven are in mesh with each other.

2 around the hollow shaft 11 inside the plate cylinder 10.
Two squeegee blades 34a and 34b are provided symmetrically with respect to the hollow shaft 11,
4b is a substrate which is welded on the hollow shaft 11 and supported by a cantilever.
31a and 31b are mounted on supporting plates 33a and 33b, which are supported in an inclined state by five leg plates 32a and 32b which are erected at equal intervals, and are slid onto the inner peripheral surface of the plate cylinder 10 at the leading ends. Holds in contact.

Further, the plate cylinder 1 is externally provided in the hollow shaft 11.
The printing ink supply pipe 12 for supplying the printing ink is inserted into the inside of the plate 0, and is branched from the printing ink supply pipe 12 in the plate cylinder 10 to form the hollow shaft 11 and the support plates 31a, 31b.
Printing ink is supplied to the vicinity of the squeegee blades 34a, 34b from the branch pipes 12a, 12b penetrating therethrough and extending parallel to the squeegee blades 34a, 34b.

A squeegee device rotating portion 51 is provided adjacent to the end support ring 21b. The squeegee device rotating portion 51 includes a connecting ring 54 that is rotatably supported around the hollow shaft 11 by a bearing 55 and that engages with a cutout portion of the hollow shaft 11 so as to rotate with the hollow shaft 11. Has been The squeegee device rotating portion 51 is provided with a tooth row 52 on the outer peripheral surface thereof and is rotationally driven by a driving gear 53 meshing with the tooth row 52, and the hollow shaft 11 and the squeegee blades 34a and 34b attached thereto are mounted on the plate cylinder 10. It is able to rotate relative to it.

Next, the operation of the apparatus shown in FIGS. 1 and 2 will be described. As shown in FIG. 1, two squeegee blades arranged symmetrically with respect to the central axis of the hollow shaft 11, that is, the plate cylinder 10.
34a and 34b are arranged such that, at the time of use, the tip of one of the squeegee blades 34b is located so as to face the press roller 70 provided outside the plate cylinder 10 by operating the drive gear 53, It is fixed by making the drive gear 53 non-rotatable. When actually printing, the clamper 13
And the end of the stencil sheet (not shown) is clamped by the plate cylinder 1
After stencil paper is wound around the outer peripheral surface of No. 0, the ink amount in the plate cylinder is detected by a printing ink amount detection device (not shown), and if necessary, the branch pipe 12b is transferred to the inner peripheral surface of the plate cylinder 10. The plate cylinder 10 is rotated in the direction of the arrow in FIG. 2 by rotating the drive gears 42a and 42b while supplying the printing ink. At this time, the squeegee blade 34b, which is arranged so as to face the press roller 70, is brought into sliding contact with the inner peripheral surface of the plate cylinder 10 so that the printing ink is pushed into the inner peripheral surface of the plate cylinder 10 and supplied, and synchronized with this. By sending the printing paper between the plate cylinder 10 and the press roller 70, the printing paper is brought into close contact with the stencil base paper, and the printing ink is transferred from the perforation portion of the stencil base paper to the printing paper to perform printing.

However, if a large amount of printing is carried out in this state, the tip of the squeegee blade 34b will gradually wear due to the pressure received from the press roller 70 during printing, and the line on the printed image will become thick, and "Sharpness" is lost. At this time, by rotating the drive gear 53 to rotate the squeegee device rotating unit 51 by 180 degrees and disposing the other squeegee blade 34a so as to face the press roller 70, printing can be performed with a new squeegee blade. As a result, the "sharpness" of the image is restored.

Further, in the state shown in FIGS. 1 and 2, the squeegee blade 34b and the squeegee blade 34a are made to have different hardness, and the squeegee device rotating portion 51 is rotated,
When a high print density is desired, a squeegee blade having a high hardness is opposed to the press roller 70, and when a low print density is desired, a squeegee blade having a low hardness is pressed by the press roller 7.
The print density may be adjusted by opposition to 0 and exchanged appropriately. Similarly, the print density can be adjusted by using different materials for the squeegee blade 34b and the squeegee blade 34a.

Further, by making the shapes of the squeegee blade 34b and the squeegee blade 34a different so as to make the bending degree of the squeegee blade different at the time of pressing, the print density can be adjusted in the same manner. The print density can be adjusted in the same manner by making the distances of 34b and the squeegee blade 34a different from the center axis of the plate cylinder.

Next, referring to FIG. 3, according to the present invention,
A specific example using two squeegee rollers 61a and 61b as squeegee members will be described. Note that, in FIG. 3, portions corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG.

In FIG. 3, end support rings 21a and 25 are provided at both ends of the cylindrical plate cylinder 10, and a large gear 23a is formed on the outer periphery of the end support ring 21a. The drive gear 42a driven by a drive device that does not
It meshes with 3a. Further, the plate cylinder shaft 15 is fixed to the center of the end support ring 21a, and the plate cylinder shaft 15 is supported by a bearing 56 fixed to the printing press main body 57, and the other end support ring 25 is By guiding the upper and lower sides by the reinforcing rollers 43a and 43b attached to the printer main bodies 44a and 44b, the plate cylinder 10
Is rotatably supported.

Inside the plate cylinder 10, a hollow shaft 11 coaxial with the plate cylinder shaft 15 is arranged. One end of the hollow shaft 11 is supported by a bearing 66 provided on the shaft 15, and the other. The end is supported by a bearing 55 arranged in the printer body 50, so that the end is rotatable relative to the plate cylinder 10. Then, the drive shaft 53 is meshed with a gear 58 formed on the outer periphery of the connecting ring 54 fixed to the outer periphery of the hollow shaft 11 adjacent to the end support ring 25 to rotate the hollow shaft 11. To be done.

The hollow shaft 11 has squeegee rollers 61a and 6a.
Support plates 67a and 67b for rotatably supporting the inner peripheral surface of the plate cylinder 10 while inscribed on the inner peripheral surface of the plate cylinder 10 are attached.
A and 67b rotatably support the squeegee rollers 61a, 61b by inserting both ends of shafts 62a, 62b of the squeegee rollers 61a, 61b.

Further, the hollow shaft 11 accommodates an ink pump 87 therein, and a predetermined ink bottle 88 is inserted in the hollow shaft 11.
By inserting it into the ink pump 87 and connecting it to the ink port 80 of the ink pump 87, the branch pipes 12a, 1
Printing ink can be supplied onto the squeegee rollers 61a and 61b from 2b.

Next, the operation of the apparatus shown in FIG. 3 will be described. During use, the drive gear 53 is rotated to rotate the squeegee rollers 61a, 61b.
One of the two is arranged so as to face the press roller 70,
The drive gear 53 is held stationary and fixed. Then, when actually printing, as in FIGS. 1 and 2, the clamper 13 clamps the end portion of the stencil sheet (not shown) to clamp the plate cylinder 10.
After stencil paper is wound around the outer peripheral surface of the plate, printing is performed from the branch pipe 12b to the inner peripheral surface of the plate cylinder 10 as necessary while detecting the ink amount in the plate cylinder by a printing ink amount detection device (not shown). The plate cylinder 10 is rotated by rotating the drive gear 42a while supplying ink. At this time, the squeegee roller 61b, which is arranged so as to face the press roller 70, is inscribed while rotating as the plate cylinder 10 rotates, so that the printing ink is pushed into the inner peripheral surface of the plate cylinder 10 and supplied. By sending the printing paper between the plate cylinder 10 and the press roller 70 in synchronism with the printing paper, the printing paper is brought into close contact with the stencil sheet, and the printing ink is transferred from the perforation portion of the stencil sheet to the printing sheet to perform printing.

If the squeegee roller 61b, which is arranged to face the press roller 70, is damaged for some reason, the drive gear 53 is rotated to move the connecting ring 54 to 180 degrees.
By rotating the squeegee roller 61a so that the other squeegee roller 61a faces the press roller 70, printing can be performed with a new squeegee blade.

In the case of FIG. 3 as well, as in the case of FIGS. 1 and 2, the print density is switched by changing the hardness, material and distance from the center axis of the plate cylinder of the squeegee rollers 61a and 61b. You can

Further, in FIG. 3, the squeegee roller 61a.
And 61b are provided with roller rotating gears 63a and 63b on shafts 62a and 62b, and plate cylinder shaft 15 is provided with roller drive gears 64a and 64b.
These rotary gears and drive gears are connected by belts 65a, 65b, etc., so that the squeegee rollers 61a and 6a are rotated as the plate cylinder 10 rotates.
1b may also be driven to rotate.

In the above embodiment, the mode in which two squeegee members are provided has been described, but it goes without saying that three or more squeegee members can be provided in the plate cylinder in the present invention.

[0035]

According to the present invention, a plurality of squeegee members are supported by a supporting member and provided in the plate cylinder, and each squeegee member is rotated in the plate cylinder so as to face the outer roller, if necessary. Therefore, even if one squeegee member is worn or damaged, it can be easily replaced with another squeegee member simply by rotating the support member.

Further, each shape of the plurality of squeegee members,
By changing the material or hardness or the contact pressure to the plate cylinder, the squeegee member used for printing can be selected to easily adjust the print density, if necessary.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a specific example of an ink supply squeegee device of the present invention mounted on a plate cylinder.

FIG. 2 is a schematic side sectional view taken along line II-II of FIG.

FIG. 3 is a front view showing another specific example of the squeegee device for supplying ink of the present invention partially cut away in a state of being mounted on a plate cylinder.

[Explanation of symbols]

 10 plate cylinder 11 hollow shaft 12 printing ink supply pipe 13 clamp 15 plate cylinder shaft 20a, 20b bearing 21a, 21b end support ring body 23a, 23b large gear 25 end support ring body 31a, 31b substrate 32a, 32b leg plate 33a, 33b Support plates 34a, 34b Squeegee blades 41 Shafts 42a, 42b Drive gears 43a, 43b Reinforcing rollers 44a, 44b Printing machine main body 50 Printing machine main body 51 Squeegee device rotating part 52 Tooth row 53 Drive gear 54 Coupling ring 55 Bearing 56 Bearing 57 Printer main body 58 Gears 61a, 61b Squeegee rollers 62a, 62b Shafts 63a, 63b Roller rotation gears 64a, 64b Roller drive gears 65a, 65b Belts 66 Bearings 67a, 67b Support plates 70 Press rollers 80 Ink ports 87 Ink pumps 88 in Kiboru

Claims (8)

[Claims] 1. An ink for a rotary stencil printing machine, wherein printing ink is supplied from an inner peripheral surface of an ink-permeable cylindrical plate cylinder having an outer peripheral surface mounted with a stencil sheet and rotating around its own central axis. In the supply squeegee device, the ink supply squeegee device includes a support member rotatably arranged in the plate cylinder with respect to the plate cylinder, and a plurality of members extending from the support member and contacting an inner peripheral surface of the plate cylinder. The squeegee device for ink supply of a rotary stencil printing machine, comprising: 2. The ink supply squeegee device according to claim 1, wherein the squeegee member comprises a plurality of squeegee blades that are in sliding contact with the inner peripheral surface of the plate cylinder. 3. The ink supply squeegee device according to claim 1, wherein the squeegee member is composed of a plurality of squeegee rollers which are inscribed in the inner peripheral surface of the plate cylinder and are rotatable. 4. The ink supply squeegee device according to claim 2, wherein each of the plurality of squeegee members has a different shape. 5. The ink supply squeegee device according to claim 2, wherein the plurality of squeegee members are made of different materials. 6. The ink supply squeegee device according to claim 2, wherein each of the plurality of squeegee members has different hardness. 7. The ink supply squeegee device according to claim 2, wherein the plurality of squeegee members are in contact with the plate cylinder at different pressures. 8. An ink-permeable cylindrical plate cylinder having an outer peripheral surface on which a stencil sheet is mounted and rotating around its own central axis, and a printing paper which is circumscribed on the outer peripheral surface of the plate cylinder during printing. In the rotary stencil printing machine having an outer roller for feeding while sandwiching between itself and itself, and an ink supply squeegee device arranged so as to contact the inner peripheral surface of the plate cylinder, the ink supply squeegee device is A rotation comprising: a support member rotatably arranged inside the plate cylinder with respect to the plate cylinder; and a plurality of squeegee members extending from the support member and contacting an inner peripheral surface of the plate cylinder. Type stencil printer.