JP2006116762A - Plate cylinder and stencil process printing device with this plate cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate cylinder having a weir member which prevents ink leakage from occurring over time and entirely, and a stencil process printing device equipped with the plate cylinder. <P>SOLUTION: This plate cylinder 10 has the weir member 20 which is extensively present inside/outside a pressing region 50 to be covered by a pressing member and prevents ink leakage from occurring. Alternatively, the plate cylinder 10 has a front weir member 31 which is arranged correspondingly with a pressing start position PF of the pressing member 50, in the pressing region 50 by the pressing member and prevents the ink from leaking. The stencil process printing device with this plate cylinder 10 is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plate cylinder having a weir member for preventing ink leakage and a stencil printing apparatus including the plate cylinder.

  2. Description of the Related Art Conventionally, there have been proposed a plate cylinder that has an opening portion through which ink oozes out and performs printing by pressing a pressing member against an outer peripheral surface, and a stencil printing apparatus including the plate cylinder. In such a plate cylinder and stencil printing apparatus, when printing is continued, the ink existing between the master wound around the outer periphery of the plate cylinder and the outer periphery of the plate cylinder is repeatedly compressed by the pressing member and gradually There is a case where the phenomenon that the ink moves and eventually leaks from the edge of the master, that is, ink leakage occurs. When ink leakage occurs, there is a problem because the leaked ink may adhere to the printing paper and cause printing failure. Therefore, as described in [Patent Document 1], a plate cylinder having a weir member for preventing ink leakage during printing and a stencil printing apparatus having the same have been proposed.

JP 2003-112467 A

  However, since the weir member provided in the conventional plate cylinder and stencil printing apparatus is disposed only outside the pressing area by the pressing member, and the fixing position thereof is only outside the pressing area, the pressing member is the plate. There is a possibility that the weir member may drop over time due to an impact or the like when contacting the cylinder main body, and there is a problem that ink leakage occurs when dropping occurs.

  Moreover, since the conventional dam member was arrange | positioned only corresponding to the side edge part and rear edge part of this press area | region, there existed a possibility that ink leakage might arise in the front edge part of a press area | region. In order to prevent ink leakage at the front edge of the pressing area, ink leakage at the front edge of the pressing area is more likely to occur as the accuracy of ink leakage at the side edge and rear edge of the pressing area increases. Careful consideration is required.

  An object of the present invention is to provide a plate cylinder having a weir member for preventing ink leakage over time and the entire surface, and a stencil printing apparatus including the plate cylinder.

  In order to achieve the above-mentioned object, the invention described in claim 1 has an opening portion through which ink oozes out, and a press that is pressed against the outer peripheral surface in a state in which the master made by plate making is wound around the outer peripheral surface. A printing cylinder for performing printing by transferring the ink oozed from the opening portion to the printing paper by press-contacting the printing paper with a member, and extending inside and outside the pressing area by the pressing member The plate cylinder has a weir member for preventing leakage.

  According to a second aspect of the present invention, in the plate cylinder according to the first aspect, the fixing position of the dam member extends in and out of the pressing area.

  The invention according to claim 3 is the plate cylinder according to claim 1 or 2, wherein the dam member is a front dam member extending inside and outside the edge corresponding to the pressing start position of the pressing member in the pressing region. It is characterized by including.

  The invention according to claim 4 has an opening portion through which ink oozes out, and presses the printing paper with a pressing member pressed against the outer peripheral surface in a state where the master made by the plate is wound around the outer peripheral surface. A plate cylinder for transferring the ink oozed from the opening to the printing paper and performing printing in correspondence with the pressing start position of the pressing member in the pressing area by the pressing member And a plate cylinder having a front weir member for preventing ink leakage.

  According to a fifth aspect of the present invention, in the plate cylinder according to the third or fourth aspect, the front dam member is disposed so as to extend inside and outside the front edge portion of the opening portion.

  According to a sixth aspect of the present invention, in the plate cylinder according to any one of the third to fifth aspects, the front dam member is directly fixed to the plate cylinder main body outside the opening portion. .

  The invention according to claim 7 is the plate cylinder according to any one of claims 1 to 6, wherein the weir member extends inside and outside of an edge corresponding to both ends of the pressing member in the pressing region. Including a side weir member.

  The invention described in claim 8 is characterized in that, in the plate cylinder described in claim 7, the side dam member is disposed so as to extend inside and outside the side edge portion of the opening portion.

  The invention described in claim 9 is characterized in that, in the plate cylinder described in claim 7 or 8, the side dam member is directly fixed to the plate cylinder main body outside the opening portion.

  According to a tenth aspect of the present invention, in the plate cylinder according to the eighth or ninth aspect, the side weir member has a back stop portion extending inside and outside the rear edge portion of the opening portion.

  The invention according to claim 11 is the plate cylinder according to any one of claims 1 to 10, wherein the weir member extends inward and outward of an edge corresponding to the pressing end position of the pressing member in the pressing region. It includes an existing rear dam member.

  According to a twelfth aspect of the present invention, in the plate cylinder according to the eleventh aspect, the rear dam member is disposed so as to extend inside and outside the rear edge portion of the opening portion.

  A thirteenth aspect of the present invention is the plate cylinder according to the eleventh or twelfth aspect of the present invention, wherein in the plate cylinder subordinate to the plate cylinder of the eighth aspect, the rear stop portion is arranged so as to cover the rear dam member. It was set up.

  The invention described in claim 14 is characterized in that, in the plate cylinder described in claim 13, the rear weir member is fixed to the rear stop portion.

  According to a fifteenth aspect of the present invention, there is provided a stencil printing apparatus including the plate cylinder according to any one of the first to fourteenth aspects.

  The present invention has an opening portion through which ink oozes out, and presses the printing paper with a pressing member that is pressed against the outer peripheral surface in a state where the master plate is wound around the outer peripheral surface. A plate cylinder for printing by transferring ink oozed from an aperture to a printing paper, the plate having a dam member for preventing ink leakage extending inside and outside the pressing area by the pressing member Since it is in the cylinder, it prevents the weir member from falling off over time due to the impact when the pressing member comes into contact with the plate cylinder, and the stress when the pressing member presses the plate cylinder, and ink leakage also occurs over time. Therefore, it is possible to provide a plate cylinder capable of performing good printing over time.

  If the fixing position of the dam member extends in and out of the pressing area, the dam member is further affected by impact when the pressing member abuts on the plate cylinder and stress when the pressing member presses the plate cylinder. It is possible to provide a plate cylinder that can better prevent the ink from falling off over time.

  If the dam member includes a front dam member extending in and out of the edge corresponding to the pressing start position of the pressing member in the pressing region, it could not be said that conventional ink leakage prevention was sufficient. It is possible to provide a plate cylinder that can also prevent ink leakage at the pressing start position, prevent ink leakage over time and completely, and perform good printing over time.

  The present invention has an opening portion through which ink oozes out, and presses the printing paper with a pressing member that is pressed against the outer peripheral surface in a state where the master plate is wound around the outer peripheral surface. A printing drum for transferring ink oozed from an opening to a printing paper for printing, and disposed in correspondence with a pressing start position of the pressing member in a pressing area by the pressing member, Since it is in the plate cylinder having the front weir member to prevent ink leakage, it can prevent ink leakage at the pressing start position, which could not be sufficiently prevented in the past, and prevent ink leakage entirely. Thus, it is possible to provide a plate cylinder capable of performing good printing.

  If the front weir member is disposed so as to extend inside and outside the front edge portion of the opening portion, a plate cylinder capable of further favorably preventing ink leakage at the pressing start position portion. Can be provided.

  If the front weir member is fixed directly to the plate cylinder main body outside the opening portion, the impact when the pressing member abuts the plate cylinder and the stress when the pressing member presses the plate cylinder This prevents the front weir member from dropping off better over time, does not cause ink leakage over time, and better prevents ink leakage and performs better printing over time. A plate cylinder can be provided.

  If the dam member includes side dam members extending inside and outside the edge corresponding to both ends of the pressing member in the pressing region, in particular, the impact when the pressing member abuts the plate cylinder, It is possible to prevent the side weir member from falling off due to stress when the pressing member presses the plate cylinder, and to prevent ink leakage at the edge portion, and to prevent ink leakage over time. Therefore, it is possible to provide a plate cylinder capable of performing good printing over time.

  If the side weir member is disposed so as to extend inside and outside the side edge portion of the opening portion, a plate cylinder capable of satisfactorily preventing ink leakage at the side edge portion is provided. Can be provided.

  If the side weir member is directly fixed to the plate cylinder main body outside the opening portion, the impact when the pressing member comes into contact with the plate cylinder and the stress when the pressing member presses the plate cylinder Can prevent the side weir member from dropping off over time, without causing ink leakage over time, and better preventing ink leakage over time and performing better printing over time A plate cylinder can be provided.

  If the side weir member has a trailing stop extending inside and outside the trailing edge of the aperture portion, the ink at the trailing edge where ink leakage is particularly likely to occur by the trailing stop. It is possible to provide a plate cylinder which can perform leakage prevention well and can perform good printing.

  If the dam member includes a rear dam member extending in and out of the edge corresponding to the pressing end position of the pressing member in the pressing region, in particular, the impact when the pressing member abuts the plate cylinder. It is possible to prevent the trailing weir member from dropping off due to stress when the pressing member presses the plate cylinder, and to prevent ink leakage at the pressing end position portion where ink leakage is particularly likely to occur. It is possible to provide a plate cylinder capable of performing good printing over time without causing ink leakage over time.

  If the rear weir member is disposed so as to extend inside and outside the rear edge portion of the opening portion, ink leakage prevention at the rear edge portion where ink leakage is particularly likely to occur is performed well. Therefore, it is possible to provide a plate cylinder capable of performing good printing.

  If the trailing stop portion is disposed so as to cover the trailing weir member, it is possible to satisfactorily prevent ink leakage at the pressing end position portion and the trailing edge portion where ink leakage is particularly likely to occur. And a plate cylinder capable of performing good printing can be provided.

  If the rear dam member is fixed to the trailing stop portion, the rear dam member falls off due to impact when the pressing member abuts on the plate cylinder and stress when the pressing member presses the plate cylinder. This can be better prevented over time, and can respond flexibly to the excess ink amount, does not cause ink leakage over time, better prevents ink leakage, and better over time It is possible to provide a plate cylinder capable of performing simple printing.

  Since the present invention resides in a stencil printing apparatus comprising the plate cylinder according to any one of claims 1 to 14, it has a plate cylinder exhibiting the above-mentioned effects, and ink leakage is prevented over time. It is possible to provide a stencil printing apparatus that can perform good printing.

FIG. 1 shows an outline of a stencil printing apparatus to which the present invention is applied. The stencil printing apparatus 1 includes a plate making transport unit 2 disposed on the upper left side in FIG. 1 and a printing unit 3 disposed on the lower right side of the plate making transport unit 2 in FIG.
The plate-making transport unit 2 includes a master support member (not shown), a platen roller 5, a thermal head 6, and a master transport roller that rotatably and detachably supports a core member 4b of a master roll 4a formed by winding the master 4 in a roll shape. It has a pair 7, a cutting means 8, a master guide plate 9, and the like.

The master 4 is configured by bonding a thermoplastic resin film having a thickness of about 1 to 3 μm and a porous support made of Japanese paper.
The platen roller 5 is rotatably supported between side plates (not shown) of the plate-making transport unit 2 and is driven to rotate clockwise in FIG. 1 by a stepping motor (not shown).
The thermal head 6 is pressed against the platen roller 5 by urging means (not shown). The thermal head 6 has a plurality of heat generating elements, and the heat generating elements selectively generate heat, whereby the thermoplastic resin film surface of the master 4 is heated, melted, and perforated.

  The master transport roller pair 7 is disposed downstream of the platen roller 5 in the master transport direction. The master transport roller pair 7 includes a drive roller 7a that is driven to rotate counterclockwise in FIG. 1 by a drive unit (not shown), and a driven roller 7b that is pressed against the drive roller 7a with a predetermined pressure. . The rotational peripheral speed of the drive roller 7 a is set so as to convey the master 4 at a slightly higher speed than the platen roller 5.

The cutting means 8 is disposed downstream of the master transport roller pair 7 in the master transport direction. The cutting | disconnection means 8 has the fixed blade 8a and the movable blade 8b which moves with respect to the fixed blade 8a, and is a known structure which cut | disconnects the master 4 when the movable blade 8b rotates at the time of a movement.
The master guide plate 9 is fixed on the downstream side of the cutting means 8 in the master conveyance direction and guides the master 4.

  The printing unit 3 includes a plate cylinder 10, a press roller 11 as a pressing member provided below the plate cylinder 10 so as to be able to contact with and separate from the plate cylinder 10, and a resist disposed on the right side of the plate cylinder 10. A pair of rollers 12, an ink supply means 13 disposed inside the plate cylinder 10, a pair of arm members (not shown) that rotatably supports the press roller 11, a swinging means (not shown) that swings the arm members, and a later-described And an opening / closing device (not shown) that drives the clamper 19 to be interlocked with the phase of the plate cylinder 10.

The press roller 11 is rotatably supported between the arm members. When the arm member is oscillated by the oscillating means, the press roller 11 is pressed against or separated from the outer peripheral surface of the plate cylinder 10 with a predetermined pressure. It is like that.
The registration roller pair 12 feeds the printing paper P fed from a paper feeding unit (not shown) between the plate cylinder 10 and the press roller 11 at a predetermined timing.

  The ink supply means 13 sucks the ink in the ink pack, the support shaft 14 that also serves as an ink supply pipe, which rotatably supports the plate cylinder 10, the ink pack (not shown) provided outside the plate cylinder 10, and the ink pack. A pump (not shown) for introducing the sucked ink into the plate cylinder 10 by the support shaft 14 and ink supplied from the support shaft 14 to the inside of the plate cylinder 10 are supplied to the inner peripheral surface of the porous support plate 10a described later. And a doctor roller 16 disposed with a slight gap between the ink roller 15 and the ink roller 15.

  The support shaft 14 is formed with a plurality of supply holes 14 a for supplying ink sucked from the ink pack by the pump into the plate cylinder 10. The ink dripped from the supply hole 14 a is accumulated in a wedge-shaped space formed in the vicinity of the ink roller 15 and the doctor roller 16 to form an ink reservoir 17. The ink in the ink reservoir 17 is kneaded by the rotation of the ink roller 15 and the doctor roller 16, and is supplied to the surface of the ink roller 15 while the layer thickness is regulated by the doctor roller 16. The ink held by the ink roller 15 is supplied to the inner peripheral surface of the porous support plate 10a described below.

  As shown in FIG. 2, the plate cylinder 10 includes a porous support plate 10a, a mesh screen 10b, a stage unit 18 including a plane formed along one generatrix of the porous support plate 10a, and a stage unit 18 A clamper 19 is provided on the stage portion 18 in a manner that is rotatably supported, and clamps the tip end portion of the master 4 with the stage portion 18, and a weir member 20 shown in FIG. . FIG. 3 shows a state in which the plate cylinder 10 is developed in a planar shape, and the mesh screen 10b is not shown.

  The porous support plate 10a is made of a metal plate such as stainless steel. As shown in FIG. 2 or FIG. 3, the porous support plate 10 a includes an opening portion 10 c configured by a region in which a plurality of through holes formed by electroforming is formed, and an opening portion on the peripheral surface thereof. A portion excluding 10c, that is, a portion outside the opening portion 10c, and a non-opening portion 10d disposed so as to surround the opening portion 10c. The length of the opening 10c in the axial direction of the plate cylinder 10, that is, the direction perpendicular to the paper surface in FIGS. 1 and 2 and indicated by the arrow Y in FIG. 3 is larger than the width of the ink roller 15 in the same direction. It is set to be slightly larger.

The mesh screen 10b is formed of a resin or a metal net, and is wound in a plurality of layers on a portion corresponding to the opening 10c on the outer peripheral surface of the porous support plate 10a.
The stage part 18 is disposed in the non-opening part 10d. The stage unit 18 is made of a magnetic material.
The clamper 19 has a magnet that is magnetically attached to the stage portion 18.
The opening / closing device opens and closes the clamper 19 with respect to the stage unit 18 according to the phase of the plate cylinder 10, and closes the clamper 19 with respect to the stage unit 18 when the plate cylinder 10 occupies a predetermined phase. Yes.

  As shown in FIG. 3, the weir member 20 is arranged in a manner extending in and out of the edges 41, 42, 42, 43 of the opening 10 c. The weir member 20 is made of a thermoplastic resin film having ink impermeability such as polyester. In FIG. 3, an arrow X indicates the rotation direction of the plate cylinder 10.

  The weir member 20 has a square shape and a thickness of 0.15 mm, and is arranged so as to extend to the opening portion 10c and the non-opening portion 10d at the front edge portion 41 of the opening portion 10c in the direction X. The front leakage mylar 31 as the front dam member, a U-shape, a thickness of 0.15 mm, the side edges 42 and 42 of the opening 10c and the rear edge of the opening 10c in the direction X 43, the side leakage mylar 32 as a side dam member disposed so as to extend to the opening portion 10c and the non-opening portion 10d, a rectangular shape, a thickness of 0.3 mm, in the direction X The rear edge portion 43 of the opening portion 10c has a rear leak mylar 33 as a rear weir member disposed so as to extend to the opening portion 10c and the non-opening portion 10d.

In FIG. 3, a region surrounded by an alternate long and short dash line denoted by reference numeral 50 indicates a pressing region of the plate cylinder 10 by the press roller 11. Most of the pressing region 50 other than the front portion in the X direction is located in the formation region of the opening 10c.
The front edge of the pressing area 50 in the direction X corresponds to the pressing start position by the press roller 11, that is, the printing pressure starting position PF, and each side edge of the pressing area 50 passes through each end of the pressing roller 11. Corresponding to the pressure passing position, ie, the printing pressure side edge positions PS, PS, and the rear edge of the pressing area 50 in the direction X corresponds to the pressing end position, ie, the printing pressure releasing position PR, by the press roller 11. Yes.

As shown in FIG. 3 or FIG. 4, the front leak mylar 31 is arranged in such a manner as to extend in and out of the printing pressure start position PF of the pressing region 50.
As shown in FIG. 4, the front leak mylar 31 is directly fixed to the non-opening portion 10d constituting the main body of the plate cylinder 10 by an adhesive 51 as an adhesive member outside the opening portion 10c. Yes. The adhesive 51 is arranged in such a manner that it extends in and out of the printing pressure start position PF in the pressing area 50, and thus the front leak mylar 31 extends in and out of the printing pressure start position PF in the pressing area 50. In this manner, it is fixed to the non-opening portion 10d located outside the opening portion 10c.

  Therefore, as indicated by reference numeral FF, a fixed portion where no printing pressure is applied is formed, and it is possible to prevent the pre-leak mylar 31 from dropping off over time due to an impact or the like when the press roller 11 is pressed against the plate cylinder 10. Is done. The adhesive member may be any member as long as it can reliably fix the front leak mylar 31 to the non-opening portion 10d, such as a double-sided tape.

  As shown in FIG. 3, the side leakage mylar 32 is arranged in such a manner as to extend in and out of the printing pressure side edge position PS and the printing pressure release position PR of the pressing region 50. The side leakage mylar 32 corresponds to the side guide portions 32a and 32a as side stop portions disposed corresponding to the side edge portions 42 and 42 of the opening portion 10c and the rear edge portion 43 of the opening portion 10c. And an end guide portion 32b as a rear stop portion.

  As shown in FIG. 3 or FIG. 5, the side guide portion 32a is arranged in a manner extending in and out of the printing pressure side edge position PS of the pressing region 50, and as shown in FIG. 3 or FIG. The guide portion 32b is arranged in a manner extending inside and outside the printing pressure release position PR of the pressing region 50. In addition, since the opening part 10c, the non-opening part 10d, the pressing area 50, and the side leakage mylar 32 form a substantially symmetrical shape in the center in the direction Y, only one end side in the direction Y is shown in FIG. Is illustrated.

  As shown in FIG. 5, the side guide portion 32 a extends in and out of the opening portion 10 c, and is attached to the non-opening portion 10 d constituting the main body of the plate cylinder 10 by an adhesive 52 as an adhesive member. It is fixed directly. The adhesive 51 is positioned so as to extend in and out of the printing pressure side edge position PS of the pressing region 50, and thus the side guide portion 32 a extends in and out of the printing pressure side edge position PS of the pressing region 50. In the aspect, it is fixed to the non-opening part 10d located outside the opening part 10c.

  Therefore, as indicated by reference numeral FS, a fixed portion where no printing pressure is applied is formed, and the side leakage mylar 32 is prevented from falling off over time due to an impact or the like when the press roller 11 is pressed against the plate cylinder 10. Is done. The adhesive member may be any adhesive member such as a double-sided tape as long as it can securely fix the side guide portion 32a, that is, the side leakage mylar 32 to the non-opening portion 10d.

As shown in FIG. 3 or FIG. 6, the tail leak mylar 33 extends in and out of the printing pressure release position PR of the pressing region 50 and is disposed in a manner covered with the end guide portion 32 b.
As shown in FIG. 6, the tail leak mylar 33 is fixed to the end guide portion 32 b by an adhesive 53 as an adhesive member in a mode extending to the opening portion 10 c and the non-opening portion 10 d, and the end guide It is indirectly fixed to the main body of the plate cylinder 10 via the part 32 b, that is, the side leakage mylar 32.

  The adhesive 53 is arranged in such a manner as to extend in and out of the printing pressure release position PR in the pressing region 50. Therefore, the bottom leak mylar 31 is fixed to the end guide portion 32b and extends through the end guide portion 32b, that is, the side leak mylar 32, in such a manner that the bottom leak mylar 31 extends in and out of the printing pressure release position PR of the pressing region 50. The plate cylinder 10 is fixed to the main body.

  Therefore, as shown by the symbol FR, a fixed portion where no printing pressure is applied is formed, and it is possible to prevent the tail leak mylar 33 from falling off over time due to an impact or the like when the press roller 11 is pressed against the plate cylinder 10. Is done. The adhesive member may be any adhesive member such as a double-sided tape as long as it can securely fix the bottom leak mylar 33 to the side leak mylar 32 and the end guide portion 32b.

  In the plate cylinder 10 having the above-described configuration and the stencil printing apparatus 1 having the plate cylinder, the master 4 that has been subjected to plate making is pressed against the outer peripheral surface of the plate cylinder 10 while being wound around the outer peripheral surface of the plate cylinder 10. By press-contacting the printing paper P with the press roller 11, the ink oozed from the opening 10 c is transferred to the printing paper P and printing is performed.

  In this process, the ink exuded from the opening 10c and pressed onto the surface of the porous support plate 10a by the press contact with the press roller 11 is prevented from being leaked by the side guide portions 32a and has a sufficient height. The bottom leak mylar 33 and the end guide portion 32b have the bottom leak prevented, and the front leak mylar 31 prevents the front leak, so that the ink leaks between the opening portion 10c and the master 4 made by the plate making. Will be prevented.

  The dam member 20, that is, the front leakage mylar 31, the side leakage mylar 32, and the tail leakage mylar 33 all extend in and out of the pressing region 50, and the fixed positions thereof are in and out of the pressing region 50. Due to the extension, it is possible to prevent the weir member 20 from dropping off over time due to impact or the like when the press roller 11 is pressed against the plate cylinder 10, and ink leakage may occur over time. There is no.

The side leakage mylar 32 and the bottom leakage mylar 33 improve the ink leakage accuracy at the side edge portion and the rear edge portion of the pressing area 50, but the pressing area 50 is provided by providing the front leakage mylar 31. Ink leakage at the front edge portion of the pressing area 50 is also prevented, and ink leakage from all the side edge portions of the pressing area 50 is prevented.
As described above, the dam member 20 prevents the ink leakage over time and the entire surface. Therefore, a good printed matter can be obtained over time.

  Excess ink that has oozed out from the aperture 10c but has not been used for printing remains in the space surrounded by the dam member 20, the master 4, and the aperture 10c, and after being pressed by the press roller 11, the aperture 10c. However, since the tail leakage mylar 33 is fixed to the end guide portion 32b, the shape and volume of the space corresponding to the excess ink amount change flexibly, and excess ink is removed. It is greatly contributing to preventing ink leakage by staying in such a space.

As described above, the plate cylinder 10 to which the present invention is applied and the stencil printing apparatus 1 having the plate cylinder 10 have been described as modes for carrying out the present invention.
In the said form, although the example which uses a thermoplastic resin film for each of the dam member 20, ie, the front leak mylar 31, the side leak mylar 32, and the bottom leak mylar 33 was shown, these materials are not restricted to this, Ink impermeability Further, a flexible resin plate, rubber plate, metal plate, or the like may be used.

  Moreover, although the thickness of the front leak mylar 31 and the side leak mylar 32 is 0.15 mm, the thickness is not limited to this and may be 0.2 mm or less. If the thickness exceeds 0.2 mm, the step between the porous support plate 10a having the opening 10c and the non-opening 10d that forms the main body of the plate cylinder 10 is too large and is wound around the plate cylinder 10. In addition, since wrinkles are generated in the master 4 and the ink cannot be dammed if the thickness is too thin, it is desirable that the thickness be in the range of 0.1 mm to 0.2 mm. The bottom leak mylar 33 may be of any thickness as long as it does not interfere with printing.

When only the ink leakage from the front edge portion of the pressing area 50 is intended, the front leakage mylar 31 can be disposed only outside the pressing area 50 and fixed at this position.
If the dam member 20 is disposed inside and outside the pressing region 50 and the dropout is prevented over time, the fixing position may be only outside the pressing region 50.
The application of the present invention is not limited to the above-described embodiment unless particularly limited in the above description.

1 is a front view showing an outline of a plate cylinder to which the present invention is applied and a stencil printing apparatus having the same. It is an enlarged front view of the plate cylinder shown in FIG. FIG. 2 is a plan developed perspective view of the plate cylinder shown in FIG. 1. It is a plane expansion | deployment front sectional view of a part of plate cylinder shown in FIG. FIG. 6 is a side sectional side plan view of another part of the plate cylinder shown in FIG. 1. FIG. 6 is a front sectional front sectional view of still another part of the plate cylinder shown in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 4 Master 10 Plate cylinder 10c Opening part 10d The outer side of an opening part 11 Pressing member 20 Weir member 31 Front dam member 32 Side dam member 32b Back stop part 33 Rear dam member 41 Front edge part 42 of an opening part Side edge part of the opening part 43 Rear edge part of the opening part 50 Pressing area P Printing paper PF Edge corresponding to the pressing start position and pressing start position PR Pressing end position and edge corresponding to the pressing end position PS pressing member Edge corresponding to both ends of

Claims (15)

  In the state in which the ink oozes and has a plate-making master wound around the outer circumferential surface, the printing paper is pressed against the outer circumferential surface by pressing the printing paper from the opening portion. A plate cylinder for transferring the exuded ink onto a printing paper to perform printing, the plate cylinder having a dam member for preventing ink leakage, which extends in and out of a pressing region by the pressing member.   The plate cylinder according to claim 1, wherein a fixing position of the dam member extends in and out of the pressing area.   3. The plate cylinder according to claim 1, wherein the dam member includes a front dam member extending inward and outward of an edge corresponding to a pressing start position of the pressing member in the pressing region. .   In the state in which the ink oozes and has a plate-making master wound around the outer circumferential surface, the printing paper is pressed against the outer circumferential surface by pressing the printing paper from the opening portion. A plate cylinder for transferring the exuded ink onto a printing paper to perform printing, and is disposed corresponding to a pressing start position of the pressing member in a pressing region by the pressing member, so as to prevent ink leakage A plate cylinder having a front weir member.   5. The plate cylinder according to claim 3, wherein the front dam member is disposed so as to extend in and out of a front edge portion of the opening portion. 6.   6. The plate cylinder according to claim 3, wherein the front dam member is directly fixed to the plate cylinder main body outside the opening portion.   7. The plate cylinder according to claim 1, wherein the dam member includes a side dam member extending inside and outside of an edge portion corresponding to both end portions of the pressing member in the pressing region. Characteristic plate cylinder.   8. The plate cylinder according to claim 7, wherein the side dam member is disposed so as to extend inside and outside the side edge portion of the opening portion.   9. The plate cylinder according to claim 7, wherein the side dam member is directly fixed to the plate cylinder main body outside the opening portion.   10. The plate cylinder according to claim 8, wherein the side dam member has a back stop portion extending inward and outward of a rear edge portion of the opening portion.   11. The plate cylinder according to claim 1, wherein the dam member includes a rear dam member extending in and out of an edge portion corresponding to a pressing end position of the pressing member in the pressing region. A plate cylinder characterized by   12. The plate cylinder according to claim 11, wherein the rear dam member is disposed so as to extend inside and outside the rear edge portion of the opening portion.   The plate cylinder according to claim 11 or 12, wherein the rear stop portion is disposed so as to cover the rear dam member in the plate cylinder subordinate to the plate cylinder according to claim 8. Torso.   The plate cylinder according to claim 13, wherein the rear dam member is fixed to the rear stop portion. A stencil printing apparatus comprising the plate cylinder according to any one of claims 1 to 14.

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