JPH0952427A - Ink supply printing device for rotary stencil printer - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To collect and retain excess ink in a plate cylinder to accurately measure the amount of ink in the plate cylinder, and to supply a fixed amount of printing ink to the plate cylinder for stable printing. (EN) Provided is an ink supply / printing device for a rotary stencil printing device having a simple structure which enables printing of printing ink and can be easily applied to an existing rotary stencil printing device. SOLUTION: The printing ink is printed on the printing paper from the inner peripheral surface by sliding contact with the inner peripheral surface of the plate cylinder at a position facing the contact area between the plate cylinder (2) and the printing paper (P). The squeegee blade (52) is separated from the squeegee blade and slidably contacts the inner peripheral surface of the plate cylinder to form an ink reservoir between itself and the inner peripheral surface of the plate cylinder. An ink supply / printing apparatus provided with a doctor blade (51) for supplying printing ink to the surface as a unit of two blades branched from a base (53).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be used in a rotary stencil printing machine provided with an ink-permeable cylindrical plate cylinder which has a stencil sheet mounted on its outer peripheral surface and rotates around its own central axis. The present invention relates to an ink supply / printing apparatus and a rotary stencil printing apparatus including the ink supply / printing apparatus.

[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 passage structure such as a porous structure, and the outer peripheral surface of the plate cylinder is used for locking a stencil sheet. Equipped with a clamper. At the time of printing, one end of the stencil sheet preliminarily perforated with the image and made into a plate is wound around the plate cylinder by locking it with a clamper, and the plate cylinder is rotated while printing ink is supplied to the inner peripheral surface of the plate cylinder. The stencil printing is performed by bringing the paper into close contact with the plate cylinder by a predetermined pressing mechanism in a state of translating the paper in synchronization with the rotation and transferring the printing ink impregnated in the plate cylinder to the printing paper.

The pressing mechanism is usually rotated outside the plate cylinder by being opposed to the press roller, inside the plate cylinder by being opposed to the press roller and being inscribed on the inner peripheral surface of the plate cylinder. Squeegee roller provided so as to press the printing paper against the outer peripheral surface of the plate cylinder by the press roller and receive the pressing force by the squeegee roller to print the printing ink impregnated in the plate cylinder on the printing paper. Transfer.

In the case of such a pressing mechanism, a member called a doctor roller is arranged next to the squeegee roller with a slight distance from the squeegee roller, and the squeegee roller and the doctor roller are rotated by the rotation of the squeegee roller during printing. In the meantime, the printing ink forms a vortex and is collected, and the printing ink required for printing is transmitted as a film on the surface of the plate cylinder by the rotation of the squeegee roller from the slight gap between the squeegee roller and the doctor roller. A quantity of printing ink is supplied.

In this case, the remaining amount of the printing ink on the plate cylinder can be judged by the size of the eddy of the printing ink formed between the squeegee roller and the doctor roller, and the printing ink is replenished between the squeegee roller and the doctor roller. By keeping the size of the vortex constant, the proper amount of ink on the plate cylinder can be maintained.

Further, in order to prevent the so-called "flipping up" of the printing paper in which the printing paper is too closely attached to the printing cylinder and is not completely peeled off from the printing cylinder and discharged from the printing apparatus, the printing cylinder is stretchable. A roller-shaped paper feeding device, which is made of a certain material and has a paper clamper called a paper cylinder instead of the press roller, is provided outside the plate cylinder so as to face it, and when the printing paper approaches the paper cylinder, The stencil sheet is held against the printing paper in a state where the paper clamper of the paper cylinder holds the end portion of the printing paper and moves the printing paper on the paper cylinder in synchronization with the rotation of the plate cylinder as the paper cylinder rotates. There is also a rotary stencil printing device that presses the plate cylinder from its inner peripheral surface so that it is pressed and bulges to perform stencil printing.

On the other hand, an example of using a plate-shaped squeegee blade that slidably contacts the inner peripheral surface of the plate cylinder instead of the squeegee roller is proposed in Japanese Patent Laid-Open No. 5-69649. In this case, an ink reservoir is formed between the squeegee blade and the inner peripheral surface of the plate cylinder, and the printing ink in the ink reservoir forms the same ink vortex as the above when the plate cylinder rotates.

[0008]

In the rotary stencil printing machine using the above-mentioned squeegee roller, when printing is performed on an original having a small portion to be printed, the printing ink unnecessary for printing is an excess ink. Remains on the inner surface of the plate cylinder. A certain amount of it is transmitted to the surface of the squeegee roller and returns to the vortex of the printing ink, but there is a limit to the amount,
If the excess ink leaks out through the gap between the plate cylinder and the stencil sheet, it may stain the printing paper.

Further, in the rotary stencil device using the squeegee blade, the squeegee blade and the plate cylinder in the vicinity of the squeegee blade change their shapes when pressed by the press roller, so that the squeegee blade and the inner peripheral surface of the plate cylinder are Since the space formed during the change causes the ink vortex to lack stability, the ink vortex cannot accurately measure the ink amount of the plate cylinder. As a result, when the excess ink is generated, it is accumulated below the plate cylinder and oozes from the plate cylinder to stain the printing paper.

The present invention makes it possible to measure the amount of ink in the plate cylinder in a rotary stencil printing machine which utilizes a squeegee blade as described above to print ink from the inner peripheral surface of the plate cylinder. At the same time, the minimum amount of printing ink required for stencil printing can always be supplied to the plate cylinder in a fixed amount to collect and retain excess ink unnecessary for printing, and stable printing ink can be printed. Furthermore, it is an object of the present invention to provide an ink supply printing device having a simple structure that can be easily applied to an existing rotary stencil printing device, and a rotary stencil printing device including the same.

[0011]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned object is to provide a rotary type plate cylinder having an ink permeable stencil mounted on the outer peripheral surface thereof and rotating around its own central axis. An ink supply printing device for supplying printing ink to the inner peripheral surface of a plate cylinder of a stencil printing machine and printing it from the inner peripheral surface, at a position facing a contact area between the plate cylinder and printing paper. A squeegee blade that slides on the inner peripheral surface of the plate cylinder to print the printing ink from the inner peripheral surface onto a printing sheet,
A printing ink is supplied from the squeegee blade to the inner peripheral surface of the plate cylinder by slidingly contacting the inner peripheral surface of the plate cylinder to form an ink reservoir between itself and the inner peripheral surface of the plate cylinder. The present invention is achieved by providing an ink supply / printing device for a rotary stencil printing machine, wherein the doctor blade and the doctor blade are provided as a two-blade unit branched from the base.

That is, the ink supply and printing device of the present invention separates from the squeegee blade that prints the printing ink from the inner peripheral surface of the plate cylinder onto the printing paper, and separates the squeegee blade from the inner peripheral surface of the plate cylinder. Since a doctor blade that slides is provided, the excess printing ink supplied to the plate cylinder is scraped off by the doctor blade when the plate cylinder rotates, and an ink reservoir formed between the doctor blade and the inner peripheral surface of the plate cylinder. Since an ink vortex is formed on the squeegee and collected, excess ink is prevented from collecting around the squeegee blade. Moreover, since the doctor blade is provided separately from the squeegee blade, the ink vortex generated in the ink reservoir formed therein is not affected by the deformation of the plate cylinder near the squeegee blade during printing and is stable. , The size of the ink vortex accurately reflects the ink amount of the plate cylinder, a certain amount of ink is stably discharged from the ink reservoir to the inner peripheral surface of the plate cylinder by the doctor blade, and the printing ink is squeegee blade. Printing paper is printed stably.

Thus, by arranging the ink amount detecting means in the ink reservoir and measuring the size of the ink vortex, the ink amount of the plate cylinder can be accurately observed, and the ink amount detecting means lacks the ink amount. If the ink is detected, if the printing ink is supplied directly from the predetermined ink supply means to the ink reservoir in response to the ink amount detection means,
The amount of ink on the plate cylinder can always be kept constant. In addition, it is preferable to arrange an ink stirring pipe in the ink reservoir in parallel with the doctor blade in order to stabilize the ink vortex formed therein when the plate cylinder rotates.

The position at which the doctor blade is brought into sliding contact with the inner peripheral surface of the plate cylinder is the "downward side of rotation" of the plate cylinder, that is, the plate cylinder rotates clockwise when viewed in the central axis direction of the plate cylinder. In this case, the area is preferably in the right half of the plate cylinder, and preferably in the left half of the plate cylinder when the plate cylinder rotates counterclockwise as viewed in the central axis direction of the plate cylinder. In the present specification, the term "rotation rising side" of the plate cylinder means the remaining area on the "rotation falling side" of the plate cylinder. When the doctor blade is brought into sliding contact with the inner peripheral surface of the plate cylinder on the rising side of the plate cylinder, ink flows out from the ink reservoir to the plate cylinder bottom when the plate cylinder rotation is stopped. When the ink blade is brought into sliding contact with the inner peripheral surface of the plate cylinder on the descending side of the rotation, it is possible to prevent the ink from flowing downward from the ink reservoir when the plate cylinder stops rotating.

This doctor blade slidably contacts the inner peripheral surface of the plate cylinder and scrapes off excess printing ink of the plate cylinder during rotation of the plate cylinder. Any form may be used as long as an ink reservoir is formed between them and a predetermined amount of printing ink is pushed into the plate cylinder downstream therefrom in the rotational direction of the plate cylinder. It is preferably made of an elastic material such as rubber which extends parallel to the central axis and is in sliding contact with the inner peripheral surface of the plate cylinder.

Further, the squeegee blade slides on the inner peripheral surface of the plate cylinder at a position facing the contact area between the plate cylinder and the printing paper to print the printing ink on the printing paper from the inner peripheral surface. Any form may be used,
It is preferably made of an elastic material such as rubber that extends parallel to the central axis of the plate cylinder and is in sliding contact with the inner peripheral surface of the plate cylinder.

In the ink supply / printing apparatus of the present invention, the squeegee blade and the doctor blade are constructed as a two-blade unit which branches from the base portion. However, this unit has both the squeegee blade and the doctor blade as a single unit. The squeegee blade and the doctor blade may be connected to the base portion, or may be integrally formed with the base portion using a material such as rubber. The ink supply printing device of the present invention unitized in this way, as a substitute for the squeegee roller or squeegee blade, without substantially changing the configuration of the plate cylinder or the external roller of the conventional rotary stencil printing device. It can be applied by arranging.

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 a printing paper sheet rotated on the plate cylinder. A press roller arranged outside the plate cylinder so as to press the stencil sheet in a state of being moved in synchronism with the printing cylinder, and supplying printing ink to the inner peripheral surface of the plate cylinder and printing it from the inner peripheral surface. In a rotary stencil printing machine having an ink supply printing device arranged inside the plate cylinder so as to eject, the ink supply printing device slides on the inner peripheral surface of the plate cylinder at a position facing the press roller. A squeegee blade that comes into contact with and prints printing ink on the printing paper from the inner peripheral surface; and an ink between the squeegee blade and the inner peripheral surface of the plate cylinder that is in sliding contact with the squeegee blade. A reservoir is formed and the inner peripheral surface of the plate cylinder is formed from the reservoir. A doctor blade for supplying the printing ink, the rotary stencil printing apparatus is provided for characterized in that it comprises as a unit of two blades branched from the base.

In such a rotary stencil printing machine equipped with a press roller outside the plate cylinder, when the plate cylinder rotates, the doctor blade is always brought into sliding contact with the inner peripheral surface of the plate cylinder on the descending side of the rotation of the plate cylinder. The blade is fixed at a slight distance from the inner peripheral surface of the plate cylinder so that the press roller presses the printing paper against the plate cylinder to make sliding contact with the inner peripheral surface of the plate cylinder only when the plate cylinder bends inward. It is preferable that the surplus printing ink is not accumulated around the squeegee blade and is collected in the ink reservoir of the doctor blade.

Further, according to still another aspect of the present invention, as another rotary stencil printing machine utilizing the ink supply printing device as described above, the stencil sheet is mounted on the outer peripheral surface and the center axis of the stencil sheet is attached. In a state in which a printing plate is provided with a cylindrical plate cylinder that rotates around and has elasticity and is stretchable, and the printing paper moves in synchronization with the rotation of the plate cylinder on a paper feeding device provided opposite to the plate cylinder. In a rotary stencil printing apparatus for performing stencil printing by pressing the plate cylinder from its inner peripheral surface so as to press the stencil sheet against the printing paper, and pressing the plate cylinder from its inner peripheral surface. A squeegee blade that slidably contacts the inner peripheral surface of the plate cylinder so as to swell the printing paper onto the printing paper and swell the printing ink onto the printing paper, and the squeegee blade separates from the squeegee blade. The ink is stored between itself and the inner surface of the plate cylinder by sliding on the inner surface. And a doctor blade for supplying printing ink to the inner peripheral surface thereof from the base portion and an ink supply / printing device provided as a unit of two blades branched from the base portion. A device is provided.

Also in the rotary stencil printing machine using such a stretchable plate cylinder, when the plate cylinder is rotated, the doctor blade is always in sliding contact with the inner peripheral surface of the plate cylinder on the descending side of the rotation of the plate cylinder. It is preferable that the blade is arranged so as to be rotatable around an appropriate fulcrum so that the blade can be properly attached to and detached from the inner peripheral surface of the plate cylinder.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION A specific example of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited to the specific example.

FIG. 1 schematically shows the whole of the rotary stencil printing apparatus of the present invention, and numeral 1 shows the whole stencil printing apparatus. The stencil printing machine 1 includes a housing 10 in which an ink permeable cylindrical plate cylinder 2 made of a material such as a porous metal plate or a mesh structure is rotatably provided around its central axis. The stencil sheet 3 is attached to the outer periphery of the plate cylinder 2 by winding the end portion of the stencil sheet 3 image-punched in advance by an image punching device (not shown) between the clamp 21 and the clamp base 22. ing.

When performing printing, when a user who uses the apparatus turns on a print start switch, a drive motor (not shown) rotates, and the plate cylinder 2 linked to the drive motor moves in the direction of arrow A. Start to rotate. Further, the drive motor is interlocked with a paper feed mechanism 61 for feeding the print sheet P from the guide plate 62 to the vicinity of the plate cylinder 2, and sequentially feeds the print sheet P to the vicinity of the plate cylinder 2 every rotation thereof. Then, when the printing paper P is sent to the vicinity of the plate cylinder 2, the sensor 63 recognizes the position of the printing paper P, and the press roller 41 is provided directly below the plate cylinder 2 so as to face the printing roller P and move up and down. Of the stencil sheet 3 on the outer peripheral surface of the plate cylinder 2 by pushing up in the direction of arrow D.
And press the arrow B in synchronization with the rotation of the plate cylinder 2.
Stencil printing is performed on the printing paper P by rotating in the direction of and feeding the paper. The stencil-printed printing paper P is separated from the plate cylinder 2 by the separating claw 65, passes through the guide plate 64, and is accommodated in the paper discharge tray 66.

FIG. 2 is a schematic view showing the internal structure of the plate cylinder 2 shown in FIG. 1. The plate cylinder 2 has an inner portion of the plate cylinder 2 below the region on the descending side of the rotation, that is, the side indicated by the symbol E. The doctor blade 51 is in sliding contact with the peripheral surface, and the squeegee blade 52 is disposed at the lowermost part of the plate cylinder 2 at a slight distance from the inner peripheral surface of the plate cylinder 2. Doctor blade 5
The squeegee blade 1 and the squeegee blade 52 are made of a plate-like member made of an elastic material such as rubber and extending in parallel with the central axis of the plate cylinder.
The ink-feeding / printing device of the present invention is formed integrally as a character-shaped two-blade blade.

The ink supply / printing device is fixed to the fixture 54 on the upper surface of the base portion 53 and the squeegee blade 52, and the doctor blade 51 and the squeegee blade 52 are both downstream from the base portion 53 in the rotational direction of the plate cylinder 2, that is, 2, it is arranged so as to extend while being inclined toward the right side in FIG.

Thus, the doctor blade 51 and the plate cylinder 2
Due to the inner peripheral surface of
Since the V-shaped groove 56 is defined, the groove 56 functions as an ink reservoir. The printing ink is sent from the ink tank 71 to the distributor 73 arranged in the plate cylinder 2 by the ink pump 72, and is directly supplied to the groove 56 from there.

In the illustrated example, the doctor blade 51 and the squeegee blade 52 are integrally formed with the base portion 53 with an elastic material such as rubber. However, both of them have at least a tip portion which is in sliding contact with the plate cylinder 2 made of rubber. It suffices that the base portion 53 is made of another material such as metal, and the doctor blade 51 and the squeegee blade 52 are connected to the base portion 53, for example.

As shown in FIG. 3, during printing, the plate cylinder 2
The squeegee roller 41 rises with the rotation of the
Is pressed toward the outer peripheral surface of the plate cylinder 2, and the plate cylinder 2 is distorted upward due to the pressing force of the squeegee roller 41, and the squeegee blade 52 is brought into sliding contact with the inner peripheral surface of the plate cylinder 2. At this time, the printing ink supplied to the groove 56 is pushed into the plate cylinder 2 from the sliding contact of the doctor blade 51 with the plate cylinder 2 as the plate cylinder 2 rotates, and the plate cylinder 2 is impregnated with a certain amount of the printing ink. In the state, it reaches the contact area between the plate cylinder 2 and the printing paper P, where the printing ink is printed by the squeegee blade 52, and the printing ink is transferred to the printing paper P. This time,
Since the upper surface of the squeegee blade 52 is lined by the fixture 54, the squeegee blade 52 sufficiently functions as a pressure resistant member against the pressing force of the press roller 41.

Excess ink that has not been transferred to the printing paper P is scraped off by the doctor blade 51 and the groove 5 is removed.
6, the plate cylinder 2 is always kept in a state of being impregnated with a fixed amount of printing ink, and the ink stored in the groove 56 is
The rotation of the plate cylinder forms an ink vortex. In addition, since the ink stirring pipe 55 is arranged in parallel with the doctor blade 5 in the groove 56, the printing ink is swirled while rotating around the ink stirring pipe 55 as the plate cylinder 2 rotates. Stable formation of ink vortex.

Since the ink vortex is formed in the groove 56 defined at a position separated from the position where the press roller 41 presses the stencil sheet P against the plate cylinder 2, the press roller 41 is formed.
It is stably formed without being affected by, and the size of this ink vortex accurately reflects the amount of ink in the plate cylinder. Therefore, the ink amount inside the plate cylinder can be accurately measured by providing the ink amount detecting means (not shown) in the groove 56 and measuring the size of the ink vortex. As the printing progresses, the size of the ink vortex becomes smaller. However, when the size of the ink vortex becomes smaller than a predetermined size, the ink amount detecting means reacts to operate the ink pump 72 and print from the distributor 73. By supplying ink to the groove 56 and stopping the operation of the ink pump 72 to stop the ink supply when the ink vortex becomes a predetermined size, the ink amount inside the plate cylinder is controlled to be constant. You can also

In the example of FIGS. 2 and 3, the doctor blade 5
1 is in sliding contact with the area on the lower side of the rotation of the plate cylinder indicated by reference numeral E in FIG. 2, so that the printing ink does not flow out from the groove 56 even when the rotation of the plate cylinder stops, which is convenient. However, in the present invention, such a doctor blade 5
It does not prevent the sliding contact of No. 1 on the rising side of the rotation of the plate cylinder.

FIG. 4 shows another embodiment of the present invention, in which one end of a material such as a porous metal plate or a mesh structure is fixed to the clamp base 22 and the other end is expandable / contractible via a spring 23. It is provided with a cylindrical plate cylinder 2 that is made elastic by making it movable, and a paper cylinder 45 is provided below the plate cylinder 2 so as to be opposed thereto with a slight gap therebetween. It is different from the first device. The paper cylinder 45 is a highly rigid cylinder having substantially the same radius as the plate cylinder 45 and is rotatable in the direction of arrow B around its central axis, but unlike the press roller 41 of FIG. Instead, a paper clamper 46 that holds the end of the printing paper P is provided on the outer peripheral surface thereof.

In printing, when a user of the apparatus turns on a printing start switch, a drive motor (not shown) rotates, and the plate cylinder 2 linked to the drive motor moves in the direction of arrow A. Start to rotate. Further, the drive motor is interlocked with a paper feed mechanism 61 for feeding the print sheet P from the guide plate 62 to the vicinity of the plate cylinder 2, and sequentially feeds the print sheet P to the vicinity of the plate cylinder 2 every rotation thereof. When the printing paper P is sent to the vicinity of the plate cylinder 2, the sensor 63 recognizes the position of the printing paper P and the paper clamper 46 of the paper cylinder 45 opens,
The edge of the printing paper P is fixed, and the paper cylinder 45 rotates in the direction of arrow B in synchronization with the rotation of the plate cylinder 2 to feed the paper. The stencil-printed printing paper P is separated from the paper clamper 46, and is ejected from the paper ejection tray 6
It is housed in 6.

FIG. 5 is a schematic view showing the internal structure of the plate cylinder 2 of FIG. 4, in which the plate cylinder 2 is provided with a doctor blade 51 and a squeegee blade 52 bifurcated from a base 53. It is common to the apparatus shown in FIGS. 1 to 3 in that it has an ink supply / printing apparatus integrally formed as a V-shaped two-blade. However, the ink supply printing device is attached to the holder 26 at its base portion 53, as shown in FIG.
3 to 3 are different. Further, inside the plate cylinder 2, a cam 24 that interlocks with the plate cylinder 2 is provided so as to rotate once for each rotation of the plate cylinder 2. The holder 26 is provided with a cam follower 28, which is biased by a spring 25 so that the cam follower 28 always contacts the cam 24, and is arranged to be swingable around a fulcrum 27 as the cam 24 rotates. .

The fulcrum 27 keeps the front end of the doctor blade 51 in sliding contact with the inner peripheral surface of the plate cylinder 2 while the plate cylinder 2 is rotating, while the front end of the squeegee blade 52 is in contact with the plate cylinder 2.
It is arranged at a position suitable for detachable vertical movement from the inner peripheral surface of the. For example, as shown in FIG. 5, such an operation can be satisfactorily achieved by making the distance from the fulcrum 27 to the tip of the squeegee blade 52 shorter than the distance from the fulcrum 27 to the tip of the doctor blade 51. it can.

As shown in FIG. 5, during printing, while the printing paper P is being sent between the plate cylinder 2 and the paper cylinder 45 in synchronization with the rotation of the plate cylinder 2, the holder 26 holds the spring 25. By the action, the squeegee blade 52 is moved downward, the inner peripheral surface of the plate cylinder 2 is pressed downward to bulge the plate cylinder 2 outward, and the plate cylinder 2 is pressed against the printing paper P on the paper cylinder 45. At the same time, the printing ink is printed from the inner peripheral surface of the plate cylinder 2, and the printing ink is transferred to the printing paper P via the stencil sheet 3 to perform stencil printing.

Further, as shown in FIG. 6, the clamp base 22 of the plate cylinder 2 is located below, and the paper cylinder 2 has the printing paper P.
In the state of waiting for the benefit of the squeegee blade 5, the holder 26 is pressed by the cam 24 against the spring 25 and slightly swung counterclockwise around the fulcrum 27.
The leading end of 2 is moved upward and separated from the inner peripheral surface of the plate cylinder 2.

In the state shown in FIGS. 5 and 6, since the doctor blade 51 is always kept in sliding contact with the inner peripheral surface of the plate cylinder 2, the excess printing ink inside the plate cylinder 2 is scraped off by the doctor blade 51. Regardless of whether the plate cylinder is stopped or rotated, it is stored in a groove 56 having a substantially V-shaped cross section defined on the upstream side of the doctor blade 51 in the plate cylinder rotation direction.
Then, when the plate cylinder rotates, the printing ink stored in the groove 56 is pushed into the plate cylinder 2 from the sliding contact of the doctor blade 51 with the plate cylinder 2 as the plate cylinder 2 rotates, and the plate cylinder 2 has a fixed amount of the printing ink. The ink reaches the squeegee blade 52 in a state of being impregnated therewith, and printing ink is printed there, so that stencil printing is stably performed.

Similarly to the case of FIGS. 1 to 3, in the cases of FIGS. 4 to 6, the printing ink stored in the groove 56 forms an ink vortex by the rotation of the plate cylinder, and the ink vortex is formed by the doctor blade 5. It is stabilized by the ink stirring pipe 55 arranged in parallel with. Since the ink vortex is formed at a position apart from the position where the squeegee blade 52 presses the plate cylinder 2, the ink vortex is stably maintained without being affected by the deformation of the plate cylinder 2 by the squeegee blade 52. Since the size of the ink accurately reflects the ink amount in the plate cylinder, as described above with reference to FIGS. 1 to 3, the ink amount detecting means (not shown) is provided in the groove 56 to control the size of the ink vortex. By measuring, the ink amount of the plate cylinder can be accurately measured, and when the size of the ink vortex becomes smaller than a predetermined size, the ink amount detecting means reacts to operate the ink pump 72, and the distributor 73 It is also possible to control the amount of ink inside the plate cylinder so that the printing ink is supplied to the groove 56 from the above.

[0041]

According to the present invention, in a rotary stencil printer that utilizes a squeegee blade to print ink from the inner peripheral surface of the plate cylinder onto a printing sheet, the squeegee blade is branched and is different from the squeegee blade. Since an ink supply printing device equipped with a doctor blade that slidably contacts the inner peripheral surface of the plate cylinder at a position was used, the excess ink inside the plate cylinder was scraped off by the doctor blade, and between the doctor blade and plate cylinder. The ink is held in the formed ink reservoir, and a constant amount of ink is always supplied to the plate cylinder from the ink reservoir, so that the printing ink is stably printed from the squeegee blade.

Further, since the ink reservoir is formed at a position separated from the plate cylinder sliding contact portion of the squeegee blade, the ink vortex formed therein is stable during the rotation of the plate cylinder. The size of the ink vortex accurately reflects the amount of ink in the plate cylinder.By measuring this size, the required amount of printing ink can be accurately supplied to the plate cylinder, and the ink amount in the plate cylinder is kept constant. To be able to hold
It is also possible to prevent excess printing ink from leaking from the plate cylinder.

Further, since the ink supply printing apparatus of the present invention is provided with the squeegee blade and the doctor blade as a unit of two blades, it can be easily applied to the plate cylinder of the existing rotary stencil printing machine, It also contributes to reducing the number of parts of the device and cost.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an entire specific example of a rotary stencil printing apparatus of the present invention.

FIG. 2 is a side view showing the internal structure of the plate cylinder of FIG. 1 in a non-printing state.

FIG. 3 is a side view showing the internal structure of the plate cylinder of FIG. 1 in a printed state.

FIG. 4 is a side view schematically showing the whole of a specific example of the rotary stencil printing machine of the present invention.

5 is a side view showing the internal structure of the plate cylinder of FIG. 4 in a printed state.

FIG. 6 is a side view showing the internal structure of the plate cylinder of FIG. 4 in a non-printing state.

[Explanation of symbols]

 1 stencil printer 10 housing 2 plate cylinder 21 clamp 22 clamp base 23 spring 24 cam 25 spring 26 holder 27 fulcrum 28 cam follower 3 stencil base paper 41 press roller 45 paper cylinder 46 paper clamper 51 doctor blade 52 squeegee blade 53 base 54 mounting tool 55 Ink Stirring Pipe 56 Groove 61 Paper Feed Mechanism 62 Guide Plate 63 Sensor 64 Guide Plate 65 Separation Claw 66 Paper Ejection Plate P Printing Paper

Claims (9)

[Claims] 1. A printing ink is supplied to the inner peripheral surface of a plate cylinder of a rotary stencil printing machine, which comprises a stencil sheet mounted on the outer peripheral surface thereof and equipped with an ink-permeable cylindrical plate cylinder which rotates around its own central axis. And an ink supply and printing device for printing this from the inner peripheral surface, the inner peripheral surface being slidably contacted with the inner peripheral surface of the plate cylinder at a position facing the contact area between the plate cylinder and the printing paper. A squeegee blade for printing the printing ink onto the printing paper from the surface, and an ink reservoir portion is formed between the squeegee blade and the inner peripheral surface of the plate cylinder by slidingly contacting the inner peripheral surface of the plate cylinder. At the same time, a doctor blade for supplying printing ink to the inner peripheral surface of the plate cylinder from there is provided as a two-blade unit branched from the base portion, and an ink supply / printing device for a rotary stencil printing machine. 2. An ink permeable stencil plate cylinder having a stencil sheet mounted on its outer peripheral surface and rotating around its own central axis, and a stencil plate in a state where the printing paper is moved in synchronization with the rotation of the plate cylinder. A press roller arranged outside the plate cylinder so as to press the base paper, and a printing roller arranged inside the plate cylinder so as to supply printing ink to the inner peripheral surface of the plate cylinder and to print it from the inner peripheral surface. In a rotary stencil printing machine having an ink supply / printing device, the ink supply / printing device slides on the inner peripheral surface of the plate cylinder at a position facing the press roller to print the printing ink from the inner peripheral surface. A squeegee blade to be printed on a printing paper, and an ink reservoir portion is formed between the squeegee blade and the inner peripheral surface of the plate cylinder so as to be in sliding contact with the squeegee blade so as to separate the plate from the inner peripheral surface Doctor break that supplies printing ink to the inner surface of the body The rotary stencil printing machine is characterized in that it is provided as a unit of two blades branched from the base. 3. The rotary stencil printing machine according to claim 2, wherein the doctor blade is in sliding contact with the inner peripheral surface of the plate cylinder on the descending side of rotation of the plate cylinder. 4. The squeegee blade has a slight amount from the inner peripheral surface of the plate cylinder so that the press roller presses the printing paper against the plate cylinder so that the press roller slides in contact with the inner peripheral surface of the plate cylinder only when the plate cylinder bends inward. The rotary stencil printing apparatus according to claim 3, wherein the rotary stencil printing apparatus is fixed at intervals. 5. The rotary stencil according to claim 4, wherein an ink agitation pipe for stabilizing ink vortex formed when the plate cylinder rotates is arranged in parallel with the doctor blade in the ink reservoir. Printing device. 6. An ink permeable and stretchable cylindrical plate cylinder having an outer peripheral surface on which a stencil sheet is mounted and which rotates around its own central axis, on a paper feeding device provided opposite to the plate cylinder. The stencil printing is performed by pressing the plate cylinder from the inner peripheral surface of the stencil so that the stencil sheet is pressed against the printing paper while the printing paper moves in synchronization with the rotation of the plate cylinder. In a rotary stencil printing machine, the inner peripheral surface of the plate cylinder is pressed from the inner peripheral surface of the plate cylinder to swell to the printing paper and print ink is printed from the inner peripheral surface to the printing paper. And a squeegee blade slidingly contacting with the squeegee blade to form an ink reservoir between the squeegee blade and the inner peripheral surface of the plate cylinder so as to form an ink reservoir between itself and the inner peripheral surface. A doctor blade that supplies printing ink and a 2-blade A rotary stencil printing machine having an ink supply printing device provided as a printer. 7. The rotary stencil printing apparatus according to claim 6, wherein the doctor blade is in sliding contact with the inner peripheral surface of the plate cylinder on the descending side of rotation of the plate cylinder. 8. The ink supply / printing device is rotatably arranged around a fulcrum so that the doctor blade is always in sliding contact with the inner peripheral surface of the plate cylinder while the squeegee blade can be detached from the inner peripheral surface of the plate cylinder. The rotary stencil printing apparatus according to claim 7, wherein 9. The rotary stencil according to claim 8, wherein an ink agitation pipe for stabilizing an ink vortex formed when the plate cylinder rotates is arranged in parallel with the doctor blade in the ink reservoir. Printing device.