JP2002172842A - Screen printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises due to contact between an ink recovery blade and the inner circumferential surface of a plate cylinder during the rotation thereof, and to prevent ink from being retained beside an ink roller. SOLUTION: An ink recovery means 8 includes a blade holder 40 fixed to a bracket 32 supporting an ink roller 6, an ink recovery blade 44, and an ink returning member 42. A free end 44c of the blade 44 is chamfered along the entire axial direction of the roller 6, while the corners of the opposite ends of the blade 44 are also chamfered. The end 44c is polished. The width of the blade 44 in the axial direction of the roller 6 is made smaller than that of the roller.

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 for performing printing by pressing a printing sheet against a printing drum on which a master having a plate made thereon is wound on the outer peripheral surface.

[0002]

2. Description of the Related Art In a stencil printing machine, a master perforated by a thermal head or the like is wound around an outer peripheral surface of a plate cylinder having an ink supply means therein, and the printing paper is pressed by a pressing member such as a press roller. Printing is performed by pressing the cylinder. Generally, an ink roller, which is a component of the ink supply means, is provided at a position facing the press roller inside the plate cylinder, and ink supplied from the ink roller to the inner peripheral surface of the plate cylinder is pressed against the press roller. The pressure (printing pressure) oozes out of the perforated portion of the master through the opening of the plate cylinder, and the oozed ink transfers to the printing paper to form an ink image.

[0003] The plate cylinder generally comprises a cylindrical porous support plate as a plate cylinder main body, a mesh screen wound around the outer peripheral surface of the porous support plate, and the like. A plate-made master is wound around the surface. The mesh screen is for diffusing the ink that has come out of the openings of the porous support plate to make the ink supply to the master uniform, and is formed by woven with a thin line of polyester or stainless steel. About three layers are wound.

In this type of stencil printing apparatus, in order to secure a sufficient image density, ink is supplied quantitatively regardless of the magnitude of the image ratio. As an extreme example, there is no difference in the ink supply amount between an image having many solid portions and an image having only one dot. For this reason, the ink supply tends to be excessive, and the print quality such as so-called “offset” or “excessive thickening of dots” tends to be reduced. Further, not all of the ink supplied to the inner peripheral surface of the plate cylinder by the ink roller is consumed every time for printing, and ink not used for printing remains attached to the inner peripheral surface of the plate cylinder. The amount is such that printing can be continued for a while after the printing pressure has been reached, even if no new ink is supplied. The amount of the residual ink naturally increases when the image ratio is small. If the amount of ink adhering to the inner peripheral surface of the plate cylinder becomes too large, adverse effects such as leakage of the ink to the outside of the plate cylinder and soiling of the printing paper occur.

[0005] Further, the ink not used for printing remains on the inner peripheral surface of the plate cylinder, and the apparatus is not used for a long time.
For example, if the ink is left for a few days, there is a problem that the quality of the printed matter is deteriorated due to the change of the ink over time. In particular, when the ink is of the emulsion type, water evaporates and the viscosity decreases. Over time, blurred images that cannot be used occur. The print quality is not stable unless the changed ink is replaced. In the past, measures such as printing on rubbed paper until the effect of residual ink with reduced viscosity disappeared, or soaking it into a new master and discarding it were taken, but a great deal of economic loss and waste of time was taken. It has become.

In order to address this problem, Japanese Patent Application Laid-Open No. 2000-2000
Japanese Patent Application Laid-Open No. 177226 proposes a technique in which an ink collecting means is provided immediately downstream of an ink roller to scrape ink attached to the inner peripheral surface of a plate cylinder every time printing is performed and to return the ink to the ink roller. That is, every time printing on one printing paper is completed, the ink adhesion state in the printing drum is returned to the initial state, and the ink amount on the inner circumferential surface of the printing cylinder is always maintained at an appropriate amount necessary for one printing paper. It is a thing. The ink collection means
It has a scraping member (ink recovery blade) that scrapes ink by contacting the inner peripheral surface of the plate cylinder, and an ink return member that returns the ink scraped by the scraping member to the ink roller. The scraping member is fixed at its base end to a bracket that supports the ink roller, and its free end does not impair the scraping function to reduce contact resistance with the opening on the inner peripheral surface of the plate cylinder. The range is rounded.

[0007]

Since the scraping member is rounded only at the portion of the free end facing the ink flow, edges are present on both sides (both corners) of the free end. There was a problem that the edge was caught by the opening in the inner peripheral surface of the plate cylinder, and the noise increased when the plate cylinder was rotated. Even at the rounded portion, noise was generated due to the contact with the edge of the opening on the inner peripheral surface of the plate cylinder. In addition, there is a problem that the ink scraped off by the scraping member wraps around the ink roller (both ends in the axial direction), accumulates there, loosens after being left for several hours, and flows out of the plate cylinder. In addition, there is a problem that the ink flows from the contact portion between the scraping member and the plate cylinder to the back surface of the scraping member, where the ink is accumulated and loosened after being left for several hours, thereby causing unevenness in a printed image thereafter.

Accordingly, an object of the present invention is to provide a stencil printing apparatus that can solve the above-mentioned problems caused by the shape, dimensions, and the like of the ink recovery blade.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a plate cylinder having a cylindrical porous support plate having a large number of apertures, and an inner portion of the plate cylinder. An ink roller for supplying ink to the inner peripheral surface of the plate cylinder; and an ink roller provided in the plate cylinder near the downstream side of the ink roller in the rotational direction of the plate cylinder for collecting ink remaining on the inner peripheral surface of the plate cylinder. A stencil printing apparatus having an ink collecting means for returning the ink to the ink roller, wherein the ink collecting means has an ink collecting blade for scraping ink from an inner peripheral surface of the plate cylinder by a free end. The width of the ink roller in the axial direction is not more than the same width of the ink roller,
The configuration is adopted.

According to the second aspect of the present invention, a plate cylinder provided with a cylindrical porous support plate having a large number of openings, and ink is supplied to the inner peripheral surface of the plate cylinder provided inside the plate cylinder. Stencil printing having an ink roller to perform and ink collecting means provided in the plate cylinder near the downstream side of the ink roller in the plate cylinder rotation direction to collect ink remaining on the inner peripheral surface of the plate cylinder and return the ink to the ink roller. In the apparatus, the ink collecting means has an ink collecting blade for scraping ink from an inner peripheral surface of the plate cylinder by a free end, and the free end of the ink collecting blade extends over the entire axial direction of the ink roller. It has a configuration in which it is rounded and the corners at both ends are also rounded.

According to a third aspect of the present invention, in the stencil printing machine according to the second aspect, the free end of the ink recovery blade is polished.

According to a fourth aspect of the present invention, in the stencil printing apparatus according to the second aspect, the free end of the ink collecting blade is surface-treated.

According to the fifth aspect of the present invention, a plate cylinder provided with a cylindrical porous support plate having a large number of apertures, and ink is supplied to the inner peripheral surface of the plate cylinder provided inside the plate cylinder. Stencil printing having an ink roller to perform and ink collecting means provided in the plate cylinder near the downstream side of the ink roller in the plate cylinder rotation direction to collect ink remaining on the inner peripheral surface of the plate cylinder and return the ink to the ink roller. In the apparatus, the ink collecting means has an ink collecting blade for scraping ink from an inner peripheral surface of the plate cylinder by a free end, and the free end of the ink collecting blade is V-shaped toward the inner peripheral surface. It is configured to be folded back.

According to a sixth aspect of the present invention, in the stencil printing machine according to the fifth aspect, a tip of the free end folded in a V-shape is bent away from the inner peripheral surface. Has been adopted.

[0015] In the invention according to claim 7, claims 1 to 6 are provided.
In the stencil printing machine according to any one of the above, the width of the ink recovery blade in the axial direction of the ink roller is narrowed along the ink flow direction.

According to the invention described in claim 8, claims 1 to 7 are provided.
In the stencil printing machine according to any one of the above, the ink that has been scraped off by the ink collecting blade is returned to the ink roller on a surface of the ink collecting blade opposite to a surface facing the inner peripheral surface. The configuration is such that a return member is provided.

According to a ninth aspect of the present invention, in the stencil printing machine of the eighth aspect, the upper end of the ink return member is provided with:
The ink roller is located above the center position.

According to a tenth aspect of the present invention, in the stencil printing apparatus of the eighth or ninth aspect, the ink return member has a shape extending along the ink recovery blade and rising along the surface of the ink roller. It has a configuration in which the ink return base and an ink return body having elasticity fixed to a portion rising along the surface of the ink roller of the ink return base.

According to an eleventh aspect of the present invention, in the stencil printing machine of the tenth aspect, the lower end of the ink return body is pressed against the ink recovery blade and the upper end is pressed against the ink roller. I am taking it.

According to a twelfth aspect of the present invention, in the stencil printing machine according to one of the eighth to eleventh aspects, the stencil printing apparatus further comprises a blade holder fixed to a bracket supporting the ink roller, and The blade holder and the ink return member are fixed by screws with the ink recovery blade sandwiched between the ink return member and the ink return member.

According to a thirteenth aspect of the present invention, in the stencil printing machine according to the twelfth aspect, the adjusting length enables the tightening position of the ink collecting blade by the screw to be adjusted in the ink flowing direction. The configuration is such that a hole is formed.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
7 will be described with reference to FIG. First, based on FIG.
An overall configuration of a stencil printing apparatus and an outline of a printing operation according to the present embodiment will be described. The stencil printing apparatus 1 includes a paper feeder 2
And a plate cylinder 4, and an ink roller 6 provided in the plate cylinder 4.
And an ink collecting means 8 provided in the plate cylinder 4 near the downstream of the ink roller 6, a press roller 10 provided as a pressing member opposed to the plate cylinder 4, and transporting a printed sheet. And a discharge tray 14 and the like. The sheet feeding device 2 can be moved up and down by a sheet feeding table drive motor (not shown), and a sheet feeding table 16 on which sheets P are stacked.
A separation roller 18, a paper feed roller 20, a separation pad 22 facing the separation roller 18 to form a separation nip, and a registration roller pair for feeding the fed paper P to the print nip at a predetermined timing. 24 etc.

The plate cylinder 4 has an ink supply means 7 including an ink roller 6 inside, and a clamper (not shown) for holding a master (not shown) on the outer peripheral surface, similarly to a known configuration. . The press roller 10 can be freely moved toward and away from the plate cylinder 4 by a contact / separation mechanism (not shown). The paper discharge transporting unit 12 includes a transport belt 26, a suction fan 28, and the like, and has a function of transporting the printed paper P while attracting it.

When an original is set on an ADF (Auto Document Feeder) (not shown) and an operator presses a plate making start key (not shown), an original image is read by an original reading device (not shown). The master is made by a plate making means (not shown) based on the read image information of the original, and the used master wound around the plate cylinder 4 is peeled off by a plate discharging means (not shown). The master made is sandwiched by the clampers and wound around the outer peripheral surface of the plate cylinder 4. The uppermost sheet P is separated and fed by the sheet feeding device 2, and the fed sheet P is temporarily stopped by the registration roller pair 24 to correct an oblique displacement or the like. The image is sent to the print nip portion at a timing when the leading end of the image of the drum 4 and a predetermined position in the transport direction coincide. In response to this, the press roller 10 moves up and presses the sheet P against the plate cylinder 44. The ink supplied to the inner surface of the plate cylinder 4 by the pressing by the press roller 10 passes through the opening of the plate cylinder 4 and oozes out of the perforated portion of the master, and the paper P
Transfer to The sheet P on which the ink image has been transferred is peeled off from the outer peripheral surface of the plate cylinder 4 by a separation claw (not shown), conveyed by the sheet discharge conveying means 12 and stacked on the sheet discharge table 14.

Next, the ink supply means 7 and the ink recovery means 8 inside the plate cylinder 4 will be described in detail with reference to FIG. The plate cylinder 4 is rotatably supported by a support shaft 30 also serving as an ink supply pipe. The rotary support shaft 30 is provided with brackets 32, 32 for supporting the ink roller 6, and an ink distribution member. A doctor roller 36 is provided at an upper right portion of the ink roller 6.
And an ink reservoir 38 is formed between them. The ink introduced from outside the plate cylinder 4 via the support shaft 30 is dropped by the ink distribution member 34 into the ink reservoir 38. The ink in the ink pool 38 is supplied to the ink roller 6 while the layer thickness is regulated by the doctor roller 36 at a constant level. Spindle 30, ink distribution member 34, ink roller 6,
The ink supply means 7 is constituted by the doctor roller 36 and the like.

The ink collecting means 8 includes a blade holder 40 fixed to the bracket 32 and the blade holder 40.
And an ink recovery blade 44 fixed between the blade holder 40 and the ink return member 42 by screws.
2). FIG. 2 shows a state in which the ink recovery means 8 has been removed. Each bracket 32 has a blade holder 40
A hole 32a for fixing the screw is formed.

As shown in FIG. 3, the blade holder 40
Has a blade support plate 46 and fixing pieces 48 raised at both ends of the blade support plate 46. The fixing piece 48 has a screw hole 48a facing the screw hole 32a of the bracket 32, and the blade support plate 46 has a screw hole 46a at an interval in the axial direction of the ink roller 6. Are formed. Ink return member 4
Reference numeral 2 denotes an ink return base 50 extending along the blade supporting plate 46 (along the ink recovery blade 44) and having a shape rising in a V-shape along the surface of the ink roller 6, and the ink on the ink return base 50. It has an ink return body 52 having elasticity fixed to a portion 50a rising along the surface of the roller 6 (claim 1).
0). The ink return main body 52 in the present embodiment is formed of Mylar.

Blade support plate 4 of ink return base 50
The blade support plate 46 includes a portion 50b extending along
A screwing hole 50c is formed at a position facing the screwing hole 46a. The ink recovery blade 44 sandwiched between the blade holder 40 and the ink return member 42 has a position corresponding to the screw holes 46a of the blade support plate 46 and the screw holes 50c of the ink return base 50, and the ink is recovered. Slots for adjustment 44a, 4 enabling the tightening position of the blade 44 to be adjusted in the direction of ink flow.
4b is formed (claim 13).

Screw hole 50 of ink return base 50
c, long holes for adjustment 44a, 44 of the ink recovery blade 44
(b) A screw (not shown) is passed through the screw hole 46a of the blade support plate 46, and a nut (not shown) is screwed into the screw and tightened. Thus, the blade holder 40, the ink recovery blade 44, and the ink return member 42 are integrally fixed. Fixed together,
With the ink return main body 5 fixed to the bracket 32,
The lower end of 2 is set so as to press against the ink recovery blade 44, and the upper end is set so as to press against the surface of the ink roller 6 (claim 11). Loosen the screw and remove the ink collecting blade 44
, The contact state of the ink recovery blade 44 with the inner peripheral surface of the plate cylinder 4 can be adjusted.

As shown in FIG. 4, the ink recovery blade 4
Four corners 44d of both ends of the free end 44c are rounded. As shown in FIG. 5, the free end portion 44c is rounded over the entire axial direction of the ink roller 6. These roundnesses are set within a range where the scraping performance of the ink collecting blade 44 does not decrease (claim 2). Further, in the present embodiment, the free end 44c of the ink recovery blade 44 is polished to a surface roughness of about 1.6a (center line average roughness) or more (claim 3). As shown in FIG. 6, the width A of the ink recovery blade 44 in the axial direction of the ink roller 6 is set to be smaller than the width B of the ink roller 6 by about 2 mm (claim 1). Ink recovery blade 44
The materials used are phosphor bronze plate, stainless steel plate (SUS4
20, SUS304, etc.) and a plastic elastic material such as a urethane blade.

The ink adhering to the inner peripheral surface of the plate cylinder 4 is transferred to the free end 4 of the ink collecting blade 44 with the rotation of the plate cylinder 4.
It is scraped off at 4c and rises up the upper surface of the free end 44c. In this case, the roundness of the free end 44c and the corners 44 at both ends
Due to the roundness of d, the contact resistance with the opening existing on the inner peripheral surface of the plate cylinder 4 is reduced, and the noise is reduced. Moreover, the contact resistance with the opening is further reduced by the polishing process of the free end portion 44c, and the noise is further reduced. Instead of polishing, the free end 44c of the ink recovery blade 44 may be subjected to a surface treatment such as titanium nitride coating or fluorine coating. Further, since the width of the ink recovery blade 44 is set smaller than that of the ink roller 6, the ink is pushed out from between the ink recovery blade 44 and the ink roller 6 during printing, and as shown by an arrow C in FIG. The ink is prevented from wrapping around and staying beside 6.

Free end 44c of ink recovery blade 44
The ink that has competed on the upper surface of the ink roller 6 is then guided by the ink return body 52 and returned to the surface of the ink roller 6. The upper end of the ink return body 52 is located above the center position 6a of the ink roller 6 so that the ink returned to the ink roller 6 by the ink return body 52 does not drop on the way as shown by the arrow S in FIG. (Claim 9).

Next, another embodiment will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and the description of the already-described configuration and function will be omitted unless necessary. Only the main parts will be described. As shown in FIGS. 8 and 9, the free end portion 54 c of the ink collecting blade 54 in the present embodiment is folded in a V-shape toward the inner peripheral surface side of the plate cylinder 4 (claim 5), and ,
The distal end 54e of the folded portion 54d is bent in a direction away from the inner peripheral surface so as to be rounded (claim 6).
The turning angle θ in the present embodiment is about 20 °.
Reference numerals 54a and 54b denote adjustment slots. The relationship between the width of the ink recovery blade 54 and the width of the ink roller 6 is shown in FIG.
0, the width of the free end 54c is A, and the tip 54e is
Is D, the width of the base end portion is E, and the width of the ink roller 6 is B, the relationship B ≧ A>E> D is satisfied (claim 7).

By forming the free end 54c of the ink collecting blade 54 into an acute V-shape as described above, the ink adhering to the inner peripheral surface of the plate cylinder 4 can be scraped off, and the ink collecting blade 54 It is possible to prevent the ink from flowing around and staying on the rear surface R. Further, since the tip 54e of the folded portion 54d is bent round, it is possible to prevent the tip 54e from entering and colliding with the overlapping portion (W portion in FIG. 8) of the porous support plate when the plate cylinder 4 is reversed. Can be prevented, and smooth overcoming with little contact noise can be achieved.
Further, by forming the shape to be narrower in the flow direction of the ink, it is possible to prevent the ink from flowing around and staying beside the ink roller 6.

In the present embodiment, the free end 54c of the ink recovery blade 54 has a sharp pointed shape. However, as shown in FIG. 11, the free end 54c may be rounded as long as the scraping performance is not reduced. Further, as shown in FIG. 12, the shape may be partially overlapped. Also, the tip 54 of the folded back portion 54d
The bending shape of e is not limited to an arc shape as in the present embodiment, and may be bent at an acute angle as shown in FIG. 13, or may be bent at an obtuse angle as shown in FIG.

[0036]

According to the first aspect of the present invention, the width of the ink recovery blade in the axial direction of the ink roller is equal to or smaller than the same width of the ink roller, so that the ink flows around the ink roller. It can be prevented from staying and loosened by leaving to flow out of the plate cylinder. Further, it is possible to suppress the occurrence of unevenness of the printed image due to the loosening of the ink.

According to the second aspect of the present invention, the free end of the ink recovery blade has a rounded shape over the entire axial direction of the ink roller, and both end corners have a rounded shape. Therefore, noise during printing due to contact with the opening on the inner peripheral surface of the plate cylinder can be reduced.

According to the third aspect of the present invention, since the free end of the ink collecting blade is polished,
Noise during printing can be further reduced.

According to the fourth aspect of the present invention, since the free end of the ink collecting blade is surface-treated, noise during printing can be further reduced.

According to the fifth aspect of the present invention, since the free end of the ink recovery blade is folded back in a V-shape toward the inner peripheral surface, the ink wraps around the ink roller. Stagnation can be prevented, and ink leakage to the outside of the plate cylinder and generation of unevenness in a printed image due to this can be suppressed.

According to the sixth aspect of the present invention, the tip of the free end folded in a V-shape is bent away from the inner peripheral surface. It is possible to prevent the ink recovery blade from colliding with the step of the cylinder.

According to the seventh aspect of the invention, the width of the ink recovery blade in the axial direction of the ink roller is narrowed along the flow direction of the ink, so that the ink flows around the back surface of the ink recovery blade. It is possible to prevent the ink from leaking out of the plate cylinder and to prevent the occurrence of unevenness in the printed image due to this.

According to the eighth aspect of the present invention, the ink return member for returning the ink scraped by the ink recovery blade to the ink roller is provided on the surface opposite to the surface facing the inner peripheral surface of the ink recovery blade. With this configuration, it is possible to prevent the collected ink from loosing and flowing out of the plate cylinder, to suppress the unevenness of the printed image due to the loosening of the ink, and to effectively recycle the ink. Can be realized.

According to the ninth aspect of the present invention, since the upper end of the ink return member is located above the center position of the ink roller, the collected ink falls on the way in the process of returning to the ink roller. Can be prevented.

According to the tenth aspect of the present invention, the ink return member extends along the ink recovery blade and has a shape rising up along the surface of the ink roller. It has a structure that has an elastic ink return body fixed to the part rising along the surface, so that the recovered ink can be prevented from loosening and flowing out of the plate cylinder. It is possible to suppress the occurrence of unevenness in the printed image and to realize effective recycling of the ink.

According to the eleventh aspect of the invention, since the lower end of the ink return body is pressed against the ink recovery blade and the upper end is pressed against the ink roller, the ink can be recycled with high accuracy. .

According to the twelfth aspect of the present invention, there is provided a blade holder fixed to a bracket for supporting an ink roller, wherein the blade is held in a state where an ink recovery blade is sandwiched between the blade holder and an ink return member. Since the holder and the ink return member are fixed by screws, it is possible to prevent the recovered ink from loosing and flowing out of the plate cylinder, and to suppress the occurrence of unevenness in the printed image due to the loosening of the ink. In addition, effective recycling of ink can be realized.

According to the thirteenth aspect of the invention, the ink recovery blade has a configuration in which the long slot for adjustment is formed so that the tightening position of the ink recovery blade with the screw can be adjusted in the ink flowing direction. In addition, the contact state of the ink collecting blade with the inner peripheral surface of the plate cylinder can be easily adjusted, and the collecting function of the ink collecting blade can be optimized regardless of the manufacturing accuracy or the like.

[Brief description of the drawings]

FIG. 1 is a front view of a main part around an ink collecting unit according to an embodiment of the present invention.

FIG. 2 is a front view of a main part in a state where an ink collecting unit is removed.

FIG. 3 is an exploded perspective view of an ink recovery unit.

FIG. 4 is a schematic plan view of an ink recovery blade.

FIG. 5 is a sectional view taken along line YY in FIG. 4;

FIGS. 6A and 6B are diagrams showing a width dimension relationship between the ink recovery blade and the ink roller, wherein FIG. 6A is a schematic plan view of the ink recovery blade and FIG. 6B is a schematic cross-sectional view of the ink roller.

FIG. 7 is a schematic front view of the stencil printing apparatus.

FIG. 8 is a front view of a main part around an ink collecting unit according to another embodiment.

FIG. 9 is an exploded perspective view of the ink collecting means in the embodiment shown in FIG.

FIGS. 10A and 10B are diagrams showing a width dimension relationship between an ink recovery blade and an ink roller in the embodiment shown in FIGS.
FIG. 2 is a schematic plan view of an ink recovery blade, and FIG. 2B is a schematic sectional view of an ink roller.

11 is a main part front view showing a modification of the shape of the free end of the ink recovery blade in the embodiment shown in FIG. 8;

12 is a main part front view showing another modification of the shape of the free end of the ink recovery blade in the embodiment shown in FIG. 8;

13 is a main part front view showing a modified example of the shape of the folded portion at the free end of the ink recovery blade in the embodiment shown in FIG. 8;

FIG. 14 is a main part front view showing another modified example of the shape of the folded portion at the free end of the ink recovery blade in the embodiment shown in FIG. 8;

[Explanation of symbols]

 4 Plate cylinder 6 Ink roller 8 Ink collecting means 32 Bracket 40 Blade holder 44, 54 Ink collecting blade 44c, 54c Free end 42 Ink return member 50 Ink return base 52 Ink return main body 54a, 54b Long hole for adjustment

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keisuke Asada Miyashita-shi, Shibata-gun, Shimada-cho

Claims (13)

[Claims] A plate cylinder having a cylindrical porous support plate having a large number of apertures; an ink roller provided inside the plate cylinder for supplying ink to an inner peripheral surface of the plate cylinder; A stencil printing apparatus having an ink collecting means provided in the plate cylinder near the downstream side of the ink roller in the rotation direction of the plate cylinder for collecting ink remaining on the inner peripheral surface of the plate cylinder and returning the ink to the ink roller; The means has an ink recovery blade that scrapes ink from the inner peripheral surface of the plate cylinder with a free end, and the width of the ink recovery blade in the axial direction of the ink roller is equal to or less than the width of the ink roller. A stencil printing apparatus characterized by the above-mentioned. 2. A plate cylinder having a cylindrical porous support plate having a large number of apertures, an ink roller provided inside the plate cylinder and supplying ink to an inner peripheral surface of the plate cylinder. A stencil printing apparatus having an ink collecting means provided in the plate cylinder near the downstream side of the ink roller in the rotation direction of the plate cylinder for collecting ink remaining on the inner peripheral surface of the plate cylinder and returning the ink to the ink roller; The means has an ink collecting blade for scraping ink from the inner peripheral surface of the plate cylinder by a free end, and the free end of the ink collecting blade is rounded over the entire axial direction of the ink roller. And a stencil printing machine characterized in that both corners are rounded. 3. The stencil printing apparatus according to claim 2, wherein a free end of said ink recovery blade is polished. 4. The stencil printing apparatus according to claim 2, wherein a free end of said ink recovery blade is surface-treated. 5. A plate cylinder provided with a cylindrical porous support plate having a large number of apertures, an ink roller provided inside the plate cylinder and supplying ink to an inner peripheral surface of the plate cylinder. A stencil printing apparatus having an ink collecting means provided in the plate cylinder near the downstream side of the ink roller in the rotation direction of the plate cylinder for collecting ink remaining on the inner peripheral surface of the plate cylinder and returning the ink to the ink roller; The means has an ink collecting blade for scraping ink from the inner peripheral surface of the plate cylinder by a free end, and the free end of the ink collecting blade has a V toward the inner peripheral surface.
A stencil printer characterized by being folded back in a character shape. 6. A stencil printing apparatus according to claim 5, wherein a tip of said free end folded in a V-shape is bent away from said inner peripheral surface. 7. The stencil printing machine according to claim 1, wherein the width of the ink recovery blade in the axial direction of the ink roller is reduced along the ink flow direction. A stencil printing machine characterized by the following. 8. The stencil printing machine according to claim 1, wherein said ink collecting blade scrapes a surface of said ink collecting blade opposite to a surface facing said inner peripheral surface. A stencil printing machine, comprising an ink return member for returning the obtained ink to the ink roller. 9. A stencil printing apparatus according to claim 8, wherein an upper end of said ink return member is located above a center position of said ink roller. 10. The stencil printing apparatus according to claim 8, wherein said ink return member has a shape extending along said ink recovery blade and rising along the surface of said ink roller. A stencil printing machine having an ink return body having elasticity fixed to a portion rising along the surface of an ink roller of an ink return base. 11. A stencil printing apparatus according to claim 10, wherein a lower end of said ink return body is pressed against said ink recovery blade and an upper end is pressed against said ink roller. 12. A stencil printing apparatus according to claim 8, further comprising a blade holder fixed to a bracket supporting said ink roller, wherein said blade holder and said ink return member are connected to each other. A stencil printing machine wherein the blade holder and the ink return member are fixed by screws with the ink recovery blade interposed therebetween. 13. The stencil printing machine according to claim 12, wherein said ink recovery blade is provided with an adjusting slot for adjusting a tightening position of said ink recovery blade by said screw in an ink flowing direction. A stencil printing apparatus characterized by the above-mentioned.