JP4410336B2 - Stencil printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stencil printing apparatus that performs printing by bleeding ink from a master wound around a plate cylinder.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a stencil printing apparatus that prints by oozing ink from a master wound around a plate cylinder, an ink supply mechanism is provided in the plate cylinder. The ink supply mechanism includes an ink roller that is in contact with the inner peripheral surface of the plate cylinder, and the ink roller is disposed so as to sandwich a part of the plate cylinder and the master between the printing paper conveyed through the paper conveyance path. It is installed. An ink supply roller whose axial direction is parallel to the axial direction of the ink roller is close to the ink roller, and an ink reservoir having a wedge-shaped cross section is formed on the outer peripheral surfaces facing each other. The ink in the ink pack is conveyed to the ink reservoir via an ink motor, an ink shaft, and an ink supply pipe, and ink is supplied from an ejection port formed in the ink supply pipe. The ink in the ink reservoir is applied to the outer peripheral surface of the ink roller, the layer thickness is regulated by the ink supply roller, and is used for printing on the printing paper from the ink roller through the plate cylinder and the master.
[0003]
In a stencil printing apparatus capable of printing on both sides of a printing paper, plate cylinders are arranged on opposite sides of the paper conveyance path. The plate cylinders provided with the paper conveyance path interposed therebetween are arranged above and below the paper conveyance path when the paper conveyance path is formed substantially horizontally. The plate cylinder disposed below the paper conveyance path is provided with an ink supply mechanism for supplying ink from above the inner surface of the plate cylinder to printing paper conveyed over the plate cylinder via the plate cylinder and the master. It has been.
[0004]
[Problems to be solved by the invention]
In the stencil printing apparatus, ink is supplied to the inner peripheral surface of the plate cylinder via an ink roller, but ink that has not been used for printing remains on the inner peripheral surface of the plate cylinder and becomes excess ink. Although the ink supply amount is controlled by regulating the layer thickness of the ink supplied to the ink roller by the ink supply roller, the optimization of the ink layer thickness with only the ink supply roller is related to the ink viscosity The current situation is that the amount of ink supplied to the inner peripheral surface of the plate cylinder cannot be reduced as much as possible in order to avoid printing defects due to lack of ink. In addition, if excess ink remains on the inner surface of the plate cylinder, it spreads on the inner surface of the plate cylinder due to the rotation of the plate cylinder, and the ink is scattered, or ink is supplied to the inner surface of the plate cylinder by adjusting the ink layer thickness. Even if the amount is reduced, the amount of ink on the inner surface of the plate cylinder increases depending on the amount of excess ink spread. If the stencil printing apparatus is left without being used, the viscosity of the ink on the inner peripheral surface of the plate cylinder decreases with time, and there is a disadvantage that the ink drips from various locations on the inner peripheral surface of the plate cylinder.
[0005]
In a stencil printing machine capable of double-sided printing with plate cylinders arranged on both sides of the paper conveyance path, in order to avoid interference between clampers provided on the outer peripheral surface of the plate cylinder or to apply printing pressure to the conveyed printing paper In some cases, one plate cylinder is swung up and down with respect to the other plate cylinder, and ink may drip from the ink reservoir in the plate cylinder to be swung. When performing single-sided printing in a stencil printing apparatus capable of double-sided printing, printing is generally performed using only a plate cylinder provided above the paper conveyance path, and an unmade master is placed on the plate cylinder below the unused paper conveyance path. In this case, the ink is kneaded and loosened by the ink supply mechanism in the plate cylinder that is not used, and the ink tends to drip and scatter. However, the inside of the plate cylinder may be soiled.
[0006]
The present invention reduces excess ink on the inner peripheral surface of the plate cylinder as much as possible, minimizes the spread range of the excess ink on the inner peripheral surface of the plate cylinder, suppresses loosening of the ink, and reduces excess ink and loose ink. An object of the present invention is to provide a stencil printing apparatus that can reduce the occurrence of defects due to the above.
[0007]
[Means for Solving the Problems]
The present invention focuses on suppressing the amount of ink supplied to the inner peripheral surface of the plate cylinder, and the ink layer thickness formed on the outer peripheral surface of the ink roller that supplies ink to the inner peripheral surface of the plate cylinder is necessary for printing. While ensuring a sufficient amount of ink, we decided to make it as thin as possible. In order to achieve such thinning of the ink layer thickness, the invention according to claim 1 is provided between an ink roller provided inside the plate cylinder and supplying ink to the inner peripheral surface of the plate cylinder, and the ink roller. A stencil printing apparatus having an ink supply roller that is provided with a slight gap so as to form a wedge-shaped ink reservoir on the ink roller while controlling the thickness of the ink reservoir to the ink roller while controlling the layer thickness. of When printing Direction of rotation Than the ink supply roller Downstream Between the ink supply section Layer thickness regulating member that regulates the thickness of the ink supplied to the outer circumferential surface of the ink roller in the vicinity of the outer circumferential surface of the ink roller Have , The gap by the layer thickness regulating member is set smaller than the gap by the ink supply roller, and the ink supplied to the outer peripheral surface of the ink roller is regulated to the first layer thickness by the ink supply roller, and the second by the layer thickness regulating member. Regulated by the next layer thickness It is characterized by that. For this reason, the ink whose layer thickness is regulated by the ink supply roller on the outer peripheral surface of the ink roller is further regulated by the layer thickness regulating member.
[0008]
According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, a plate cylinder is disposed below a paper conveyance path through which printing paper is conveyed, and an inner surface of the plate cylinder facing the paper conveyance path. The ink supply roller and the layer thickness regulating member are arranged near the lower part of the ink roller.
[0009]
A third aspect of the present invention is the stencil printing apparatus according to the first or second aspect, wherein the layer thickness regulating member is provided so as to be rotatable relative to the ink roller in the vicinity of a portion facing the outer peripheral surface of the ink roller. It is a restriction roller. For this reason, the ink supplied to the ink roller is scraped off by the layer thickness regulating roller that rotates in the reverse direction to the rotation of the ink roller at the portion facing the layer thickness regulating roller, and the layer thickness is regulated.
[0010]
According to a fourth aspect of the present invention, in the stencil printing apparatus according to the third aspect of the present invention, the ink stencil is provided in a shape that covers the ink supply roller from below, and is disposed close to the outer peripheral surface of the ink supply roller. The ink supply member is provided so as to be able to contact the outer peripheral surface of the layer thickness regulating roller. For this reason, since the vicinity of the ink supply roller is covered from below by the ink supply member, dripping or leakage of ink from the ink reservoir is prevented even when the plate cylinder is inclined.
[0011]
According to a fifth aspect of the present invention, in the stencil printing apparatus of the fourth aspect, the gap formed between the ink supply member and the outer peripheral surface of the ink supply roller is A, the outer peripheral surface of the ink supply roller and the outer peripheral surface of the ink roller When the gap formed between the outer peripheral surface of the ink roller and the outer peripheral surface of the layer thickness regulating roller is C, the relationship between the clearances is set as A> B ≧ C. It is characterized by that. For this reason, the gap C between the outer peripheral surface of the ink roller and the outer peripheral surface of the layer thickness regulating roller is the same as or smaller than the gap B formed between the outer peripheral surface of the ink supply roller and the outer peripheral surface of the ink roller. The layer thickness of the ink supplied to the ink roller is reduced by the rotation of the gap C and the layer thickness regulating roller.
[0012]
According to a sixth aspect of the present invention, in the stencil printing apparatus according to the fourth or fifth aspect, the ink supply member is provided so as to be able to approach and separate from the outer peripheral surface of the ink supply roller, and the gap for moving the ink supply member close and separate. It has the adjustment means. For this reason, the gap formed between the ink supply member and the outer peripheral surface of the ink supply roller can be adjusted, and by adjusting this gap, the ink supply amount to the ink reservoir and the ink roller and the ink kneading condition can be adjusted. it can.
[0013]
According to a seventh aspect of the present invention, in the stencil printing apparatus according to any one of the third to sixth aspects, the outer peripheral surface of the layer thickness regulating roller can be slidably contacted on the downstream side in the rotation direction of the layer thickness regulating roller. And a cleaning member that returns the ink attached to the outer peripheral surface of the layer thickness regulating roller to the ink supply member. Since the ink scraped off by the layer thickness regulating roller is scraped off from the outer circumferential surface of the layer thickness regulating roller by the cleaning member and returned to the ink supply member, the state of the outer circumferential surface of the layer thickness regulating roller becomes good, It is possible to reduce the error of the gap C due to the difference in the amount of ink attached to the outer peripheral surface of the layer thickness regulating roller. Further, ink dripping from the outer peripheral surface of the layer thickness regulating roller is prevented, the stain inside the plate cylinder is extremely reduced, and ink is not wasted by returning the scraped ink.
[0014]
Even if the layer thickness of the ink supplied to the outer peripheral surface of the ink roller is reduced, excess ink may still be generated on the inner peripheral surface of the plate cylinder. Focusing on the point of recovery, the excess ink on the inner surface of the plate cylinder was reduced. In order to collect the ink on the inner peripheral surface of the plate cylinder, the invention according to claim 8 is the stencil printing apparatus according to any one of claims 1 to 7, wherein the printing remaining on the inner peripheral surface of the plate cylinder is performed. It has an ink collecting means for collecting the ink immediately after it and returning it to the ink supply roller. For this reason, the spread of the ink adhering to the inner peripheral surface of the plate cylinder is suppressed.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. A schematic configuration and operation of a stencil printing apparatus to which the present invention is applied will be described. In the stencil printing apparatus 100 shown in FIG. 2, plate cylinders 200 and 300 facing the sheet conveyance path 318 from above and below the sheet conveyance path 318 in the apparatus main body 100a to which the printing sheet 106 is conveyed are arranged opposite to each other. ing. The stencil printing apparatus 100 includes an original reading unit 101 on the upper part of the apparatus main body 100a. Based on the original information read by the original reading unit 101, the plate making masters 102A and 102B provided in the apparatus main body 100a are used as masters. The plate making masters created and created by the plate making apparatuses 102A and 102B are wound around the outer peripheral surfaces of the plate cylinders 200 and 300 (hereinafter referred to as “plate cylinder outer peripheral surface 200a and plate cylinder outer peripheral surface 300a”). Each wound master is peeled off and discarded from the plate cylinder outer peripheral surfaces 200a and 300a by the plate discharging apparatuses 103A and 103B before a new plate making master is wound.
[0021]
In the vicinity of the plate cylinder 300, an unmade master winding device 104 for storing an unmade master to be wound around the outer peripheral surface 300a of the plate cylinder during one-side printing by the plate cylinder 200 and transporting it to the plate cylinder 300 is disposed.
[0022]
On the uppermost stream side of the paper transport path 318, a paper feed tray 105 on which the print paper 106 is stacked is disposed so as to be able to move up and down. The printing paper 106 on the paper feeding tray 105 is separated into one sheet by a paper feeding / separating roller device 107, and the uppermost printing paper 106 is fed toward the printing section between the plate cylinder 200 and the plate cylinder 300. The The fed printing paper 106 is sent out by the registration roller pair 108 provided on the paper conveyance path 318 in front of the printing unit at the timing when the image position and the paper front end position are located in the printing unit. When the printing paper 106 that has passed through the printing unit is wound around either one of the plate cylinder outer circumferential surfaces 200a and 300a, the printing paper 106 is disposed in the vicinity of the plate cylinder outer circumferential surfaces 200a and 300a on the downstream side of the printing unit in the paper transport direction. The separation claws 109 </ b> A and 109 </ b> B are separated and guided to the guide plate pair 110. The guided printing paper 106 is placed on a paper discharge tray 112 arranged on the most downstream side of the paper conveyance path 318, and a suction fan or a counterclockwise direction arranged between the paper discharge tray 112 and the guide plate pair 110. The sheet is sucked and conveyed by a well-known sheet discharging and conveying device 111 having a porous conveying belt that moves to the sheet and discharged.
[0023]
Inside the plate cylinder 200, a wedge-shaped ink is provided between an ink roller 202 for supplying ink to the plate cylinder inner peripheral surface 200b and an outer peripheral surface (hereinafter referred to as "ink roller outer peripheral surface") 202a of the ink roller 202. An ink supply roller 206 provided with a slight gap is provided so as to form a reservoir 207. The ink roller 202 is rotationally driven in the same direction as the rotation direction (arrow H direction) at the time of printing of the plate cylinder 200, and is disposed at a position where a part of the plate cylinder 200 and the plate making master is sandwiched between the printing paper 106. . The ink supply roller 206 is driven to rotate in the direction opposite to the rotation direction of the ink roller 202 and supplies the ink in the ink reservoir 207 to the outer peripheral surface 202a of the ink roller while regulating the layer thickness. The plate cylinder 200 is rotatably supported by a hollow ink shaft 208 that receives ink supplied from an ink pack (not shown), and is connected to a drive motor (not shown) via a power transmission mechanism (not shown). It is rotationally driven in the direction of arrow H.
[0024]
Next, the internal structure of the plate cylinder 300, which is a main part of the present invention, will be described. Inside the plate cylinder 300 is a wedge-shaped ink reservoir between an ink roller 302 for supplying ink to the plate cylinder inner peripheral surface 300b and an outer peripheral surface (hereinafter referred to as "ink roller outer peripheral surface") 302a of the ink roller 302. An ink supply roller 303 provided with a slight gap so as to form 307, a layer thickness regulating roller 306 as a layer thickness regulating member for regulating the layer thickness of the ink supplied to the ink roller 302, and the like are provided. The plate cylinder 300 is disposed below the paper conveyance path 318 through which the printing paper 106 is conveyed, and the ink roller 302 is positioned in proximity to the plate cylinder inner peripheral surface 300 b facing the paper conveyance path 318, and the ink supply roller 303. The layer thickness regulating roller 306 is disposed in the vicinity below the ink roller 302.
[0025]
As shown in FIG. 1, a plate cylinder 300 is rotatably supported by a hollow ink shaft 308 that receives ink supplied from an ink pack (not shown), and is connected to a drive motor via a power transmission mechanism (not shown). And is rotated in the direction of arrow G during printing. The ink roller 302 is rotationally driven in the same direction (arrow D direction) as the plate cylinder 300 during printing (arrow G direction), and a position where the plate cylinder 300 and a part of the plate making master are sandwiched between the printing paper 106. Is arranged.
[0026]
The ink supply roller 303 is rotationally driven in the same direction (arrow E direction) in the rotation direction of the ink roller 302 (arrow D direction) and the opposite part, and the ink roller 307 controls the layer thickness of the ink in the ink reservoir 307. To the outer peripheral surface 302a.
[0027]
The layer thickness regulating roller 306 is provided in the vicinity of the ink roller outer peripheral surface 302a located downstream of the ink reservoir 307 in the rotation direction (arrow D direction) of the ink roller 302, and is opposed to the ink roller outer peripheral surface 302a. It is provided so as to be rotatable relative to the ink roller 302 in the vicinity of the portion. That is, the layer thickness regulating roller 306 is rotationally driven in the direction of arrow F, which is the same as the direction of arrow D, and is rotationally driven in a direction opposite to the rotational direction of the ink roller 302 at a portion facing the ink roller 302. Note that the present invention can also be applied in the case of the paper conveyance direction opposite to that of the present embodiment. In this case, the rotation direction of the ink roller 302 and the rotation direction of the layer thickness regulating roller 306 are opposite to those of the present embodiment. Become. The plate cylinder 300 is supported by a contact / separation mechanism (not shown) so as to be swingable up and down, and the plate cylinder outer peripheral surface 300a can be pressed and separated from the plate cylinder outer peripheral surface 200a.
[0028]
As shown in FIG. 3, inside the plate cylinder 300, a “U” -shaped frame 301 as a support member is placed on the ink shaft 308 and the lower part thereof is placed on the side plate of the plate cylinder 300 (not shown). It is fixed to. On the side surfaces 301A and 301B of the frame 301 facing each other, a shaft 332 that penetrates the ink roller 302 in the axial direction, a shaft 333 that penetrates the ink supply roller 303 in the axial direction, and a shaft that penetrates the layer thickness regulating roller 306 in the axial direction Bearing portions 342, 343, and 346 that rotatably support both ends of 336 are formed. The ink roller 302, the ink supply roller 303, and the layer thickness regulating roller 306 are supported by the frame 301 so that the axes thereof are substantially parallel to each other.
[0029]
As shown in FIG. 1, the ink supply member 304 includes an ink squirting portion 360 and is disposed below the ink supply roller 303, and is described as an outer peripheral surface of the ink supply roller 303 (hereinafter referred to as “ink supply roller outer peripheral surface”). ) 303a, and is formed in a plate shape with high adhesion on an outer peripheral surface of the layer thickness regulating roller 306 (hereinafter referred to as "layer thickness regulating roller outer circumferential surface") 306a by an elastic member such as a urethane member. The cleaning member 305 can be contacted. The cleaning member 305 is disposed between the ink supply roller 303 and the layer thickness regulating roller 306, and slides on the outer circumferential surface 306a of the layer thickness regulating roller on the downstream side of the rotation direction of the layer thickness regulating roller 306 rotating in the direction of arrow F. The ink adhering to the outer peripheral surface 306 a of the layer thickness regulating roller is scraped off and returned to the ink supply member 304.
[0030]
As shown in FIGS. 3 and 8, the ink supply member 304 is integrally formed with an ink supply roller 303 and a storage portion 304 </ b> C for storing ink on top of the side surfaces 304 </ b> A and 304 </ b> B. The inner peripheral surface 304D of the storage portion 304C is formed in an arc shape larger than the diameter of the ink supply roller 303, and the ink supply roller 303 is positioned below except for the vicinity of the proximity of the ink roller 302 and the ink supply roller 303. It is formed in the shape which covers substantially from.
[0031]
A plurality of openings 304 a constituting the spring portion 360 are formed in parallel in the axial direction of the ink supply roller 303 at the bottom of the storage portion 304 </ b> C. In this embodiment, four openings 304a are provided. A pair of pins 323 and 324 are provided on the side surfaces 304A and 304B of the ink supply member 304 so as to protrude outward. The ink supply member 304 inserts pins 323 into a pair of support holes 341 formed on the side surfaces 301A and 301B of the frame 301, and inserts pins 324 into a pair of arc-shaped elongated holes 344 formed on the side surfaces 301A and 301B. As a result, the frame 301 is rotatably supported around the pin 323, and the inner circumferential surface 304D can be moved closer to and away from the outer circumferential surface 303a of the ink supply roller.
[0032]
The cleaning member 305 is provided so as to rotate integrally with the ink supply member 304. Therefore, the rotational displacement amount of the ink supply member 304 is set so that the cleaning member 305 is in sliding contact with the outer peripheral surface 306a of the layer thickness regulating roller within the elastic deformation of the cleaning member 305. In this embodiment, the rotation center of the ink supply member 304 is a pin 323, but the ink supply member 304 is extended to the vicinity of the layer thickness regulating roller 306 and is rotatably supported by the shaft 336 of the layer thickness regulating roller 306. The shaft 336 may be the center of rotation.
[0033]
As shown in FIG. 9, a gap A is formed between the inner peripheral surface 304D of the ink supply member 304 and the ink supply roller outer peripheral surface 303a, and is formed between the ink supply roller outer peripheral surface 303a and the ink roller outer peripheral surface 302a. The gap B and the gap C formed between the ink roller outer peripheral surface 302a and the layer thickness regulating roller outer peripheral surface 306a are set to satisfy the relationship A> B ≧ C.
[0034]
As shown in FIG. 1, ink is conveyed from the ink shaft 308 to the ink reservoir 307 by a flexible connection pipe 312 that constitutes the ink supply pipe and a branched branch pipe 311 that constitutes the ink supply pipe. The As shown in FIGS. 4 and 5, the branch pipe 311 is first branched in two directions at the branch 311c from the connection port 311a connected to the connection pipe 312 through the branch 311b, and further at the branch 311e through the branch 311d. Is divided into two directions to reach the discharge port 310 constituting the spring portion 360 provided at the end of the branch 311f, and is divided into a total of four. As shown in FIG. 8, each of these discharge ports 310 is inserted into the opening 304a, and is arranged in the vicinity of the outer circumferential surface 303a of the ink supply roller located in the storage portion 304C. As shown in FIG. 1, the base end of the connection pipe 312 is attached to the ink shaft 308 by fastening the mounting flange portions 326 and 327 with bolts 328.
[0035]
Due to such a configuration, the ink is transported through the ink shaft 308, the connection pipe 312 and the branch pipe 311 from an ink pack (not shown), and is supplied from the four discharge ports 310 to the storage unit 304C. The ink supplied to the storage portion 304C is transported toward the gap B by the rotation of the ink supply roller 303. Since the gap B is set narrower than the gap A, the ink supply roller outer peripheral surface 303a An ink reservoir 307 is formed between the ink roller outer peripheral surface 302 a and new ink is supplied to the ink reservoir 307.
[0036]
The ink in the ink reservoir 307 is supplied from the ink supply roller outer peripheral surface 303a to the ink roller outer peripheral surface 302a with the layer thickness regulated by the gap B. Here, the ink that has been subjected to the first layer thickness regulation is directed to the gap C. Transported. At this time, since the gap C is set smaller than the gap B, the second layer thickness regulation is performed on the ink regulated by the gap B, and the ink layer thickness is reduced. Since the layer thickness regulating roller 306 rotates in the direction opposite to the rotation direction of the ink roller 302, the ink is scraped off by the outer circumferential surface 306a of the layer thickness regulating roller when passing through the gap C. The ink 313 is made thinner than the regulation of the layer thickness at the gap B, and is supplied to the plate cylinder inner peripheral surface 300b. The ink 313 supplied to the plate cylinder inner peripheral surface 300 b is supplied from the ink supply unit 309 to the printing paper 106 via a master (not shown) and used for image printing on the printing paper 106.
[0037]
With such a configuration, the layer thickness of the ink 313 formed on the outer peripheral surface 302a of the ink roller can be reduced, and the amount of ink supplied to the inner peripheral surface 300b of the plate cylinder is limited to the conventional primary layer thickness regulation. Can be less than nothing. The ink scraped off by the layer thickness regulating roller 306 is scraped off from the outer circumferential surface 306a of the layer thickness regulating roller by the cleaning member 305 and returned to the storage portion 304C. Therefore, the state of the outer circumferential surface 306a of the layer thickness regulating roller can be kept good, the error of the gap C due to the difference in the amount of ink attached to the outer circumferential surface 306a of the layer thickness can be reduced, and the outer circumferential surface 306a of the layer thickness regulating roller. Ink can be prevented from dripping, and the stain inside the plate cylinder 300 is extremely reduced. Further, the scraped ink is returned to the storage portion 304C, so that waste of ink is eliminated.
[0038]
As shown in FIG. 3, each discharge port 310 is directly inserted into the opening 304a. However, as shown in FIG. 6, the discharge port 310 is provided with a discharge port portion 331 that is elongated along the axial direction. If the circumferential end 331a of the discharge port portion 331 is inserted into the opening 304a or the shape of the discharge port 310 is integrated with the same shape as the discharge port portion 331, ink is supplied to the storage portion 304C. In this case, since the ink is supplied widely in the axial direction of the ink supply roller 303, it is preferable because the time until the ink reservoir 307 reaches the axial direction sufficiently becomes short.
[0039]
As shown in FIG. 1, an ink collecting unit 314 is provided inside the plate cylinder 300 to collect the excess ink 313 a immediately after printing remaining on the plate cylinder inner peripheral surface 300 b and return it to the ink supply roller 303. The ink collecting means 314 includes an ink collecting member 315 and a tension coil spring (hereinafter referred to as “coil spring”) 317 as an urging means for urging the free end 315b of the ink collecting member 315 toward the plate cylinder inner peripheral surface 300b. And.
[0040]
As shown in FIGS. 7 and 9, the ink recovery member 315 has support shafts 325 formed on both side surfaces thereof on the base end 315a side, and the support shafts 325 are formed on the side surfaces 301A and 301B of the frame 301, respectively. By being inserted into the pair of support holes 345, it is supported so as to be rotatable in a direction in which it is in contact with and away from the plate cylinder inner peripheral surface 300b. Each support shaft 325 is formed with a flat mounting surface 325a having a screw hole. A short side portion 316a of a pair of L-shaped brackets 316 is fixed to each mounting surface 325a. One end of a coil spring 317 is engaged with the other end 316b of the pair of brackets 316, respectively. The other end of each of the coil springs 317 is locked to spring hook portions 301C formed on the side surfaces 301A and 301B, respectively.
[0041]
That is, as shown in FIGS. 1 and 9, the free end 315b of the ink recovery member 315 is rotated in the direction of rotation of the plate cylinder 300 (in the direction of arrow G) rather than the ink supply unit 309 from the ink roller 302 to the plate cylinder inner peripheral surface 300b. ) Is provided so as to be in contact with a plate cylinder inner peripheral surface 300b located on the downstream side. The surface of the ink recovery member 315 facing the ink roller 302 constitutes a guide surface 315c that continuously extends from the free end 315b to the vicinity of the ink supply roller 303, that is, the ink reservoir 307. The full width in the axial direction of the ink recovery member 315 is set to the same length as the substantially full width of the plate cylinder inner peripheral surface 300b.
[0042]
Since the ink collecting means 314 having such a configuration is provided inside the plate cylinder 300, the leading end 315b of the ink collecting member 315 is pressed against the inner peripheral surface 300b of the plate cylinder past the ink supply unit 309. The ink attached to the inner peripheral surface 300b is scraped off from the plate cylinder inner peripheral surface 300b by the ink supply member 315 immediately after passing through the ink supply unit 309. For this reason, the ink on the inner peripheral surface 300b of the plate cylinder, that is, the surplus ink 313a that has not been used for printing past the ink supply unit 309 can be collected in a narrow range of the inner peripheral surface 300b of the plate cylinder. And the ink dripping and the stain inside the plate cylinder are extremely reduced. Furthermore, since the recovered excess ink 313a is returned to the ink reservoir 307, it can be used again for printing, and waste of ink can be reduced. Further, since the ink supply member 304 covers the ink supply roller 303 from below, the plate cylinder outer peripheral surface 300a is pressed from the printing pressure position where the plate cylinder outer peripheral surface 200a indicated by a two-dot chain line in FIG. Even when the ink is displaced and inclined to the separation position indicated by the solid line in the figure, ink dripping or leakage from the ink reservoir 307 can be prevented, and contamination inside the plate cylinder can be further reduced.
[0043]
As shown in FIGS. 8 and 9, gap adjusting means 350 for moving the inner peripheral surface 304D of the ink supply member 304 close to and away from the outer peripheral surface 303a of the ink supply roller is provided inside the plate cylinder 300. . The gap adjusting means 350 mainly includes an arm member 351 that contacts the lower surface of the ink supply member 304 and a drive mechanism that swings the arm member 351.
[0044]
The arm member 351 has a “U” shape in plan view, and a support shaft 352 is fixed to the base end side of the side surfaces facing each other. The distance between the side surfaces of the arm member 351 is set such that all the four discharge ports 310 of the branch pipe 311 can be accommodated within the distance. Both ends of the support shaft 352 are rotatably supported on the side surfaces 301A and 301B of the frame 301, for example.
[0045]
The drive mechanism includes a step motor 355 that can rotate forward and backward as a drive source, an output gear 354 that is fixed on the output shaft 355a of the step motor 355, and a drive gear that is fixed to the support shaft 352 and meshes with the output gear 354. 353. The step motor 355 is attached to the frame 301 directly or via a bracket, for example. The step motor 355 is placed under the control of the control means 356 as shown in FIG. The main part of the control means 356 is composed of a known microcomputer. The control unit 356 is connected to a switch 357 as a gap adjustment operation unit provided on an operation panel (not shown). By operating the switch 357, the control unit 356 rotates the rotation direction and amount of the step motor 355. Is increased or decreased in stages.
[0046]
When the gap adjusting means 350 having such a configuration is provided, the rotation direction and the amount of rotation of the step motor 355 are controlled stepwise by operating the switch 357. Therefore, the rotation of the step motor 355 is controlled by the output gear. 354, and transmitted to the support shaft 352 via the drive gear 353. As a result, the support shaft 352 is rotated in the clockwise direction or the counterclockwise direction in FIG. 9 according to the operation state of the switch 357, so that the arm member 351 swings up and down around the support shaft 352 to supply ink. The distance A between the inner peripheral surface 304D of the member 304 and the ink supply roller outer peripheral surface 303a can be increased or decreased.
[0047]
When the switch 357 is operated to swing the arm member 351 upward in FIG. 9, the ink supply member 304 rotates clockwise about the pin 323, that is, is displaced upward, so that the gap A is formed. Narrow. For this reason, the amount of ink supplied to the ink reservoir 307 is reduced. For example, when the plate cylinder 300 is not used, the ink in the ink reservoir 307 is kneaded and loosened by the rotation of the ink roller 302 and the ink supply roller 303. Can be prevented.
[0048]
When the switch 357 is operated to swing the arm member 351 downward in FIG. 11, the ink supply member 304 rotates counterclockwise around the pin 323, that is, is displaced downward, so that the gap A Becomes wider. When the interval A is increased to a certain extent, the flow resistance of the ink due to the rotation of the ink supply roller 303 is reduced, so that loosening due to the kneading of the ink in the storage portion 304C can be prevented.
[0049]
In this way, by preventing the ink from loosening in the vicinity of the ink supply roller 303, unnecessary ink viscosity change due to ink kneading can be prevented, and the regulation of the ink layer thickness by the gap B and the gap C can be stabilized. As a result, the ink supply amount to the plate cylinder inner peripheral surface 300b can be supplied as set, and excess ink can be reduced. Further, since the looseness of the ink is reduced, the ink is less scattered and drooped, and the stain inside the plate cylinder can be extremely reduced.
[0050]
FIG. 12 includes an ink recovery means 414 different from the ink recovery means 314 described above. The ink collecting means 414 extends the outer peripheral wall of the storage portion 304C of the ink supply member 304 toward the plate cylinder inner peripheral surface 300b to provide an extended portion 330, and this extended portion 330 is used as an ink collecting member. . The leading end 330a of the extension 300 is an inner peripheral surface 300b of the plate cylinder that is located downstream of the ink supply unit 309 from the ink roller 302 to the inner peripheral surface 300b of the plate cylinder in the rotational direction (arrow G direction) of the plate cylinder 300. It is provided so that contact is possible. For this reason, the inner peripheral surface 304 </ b> D forms a continuous guide surface that extends from the tip 330 a to the vicinity of the ink supply roller 303.
[0051]
With such a configuration, the ink adhering to the inner surface 300b of the plate cylinder passes through the ink supply unit 309, and is scraped off by the tip 330a of the extension 330, and the ink supply roller 303 moves along the inner surface 304D. Since it is guided to the vicinity, that is, the ink reservoir 307, the spread of the excess ink 313a adhering to the plate cylinder inner peripheral surface 300b can be suppressed without providing a large mechanism such as the ink collecting means 314, and ink dripping or plate printing Not only can the stain inside the cylinder be extremely reduced, but the recovered excess ink 313a can be used again for printing, and waste of ink can be reduced. Further, since the extension portion 330 is integrally formed with the storage portion 304C up to the inner peripheral surface 300b of the plate cylinder, the ink reservoir even if the plate cylinder 300 occupies the separated position shown by the solid line in FIG. 10 and the ink reservoir 307 is inclined. Since the ink 307 is received by the extension 330, ink dripping and leakage from the inter-reservoir 307 can be prevented.
[0052]
In the ink recovery means 414 shown in FIG. 12, a part of the ink supply member 304 is extended toward the inner surface 300b of the plate cylinder, and the extension 330 is used as the ink recovery member. However, as shown in FIG. The base end 320b of the ink collecting member 320 made of a thin plate material or film material is fixed to the upper end portion 304E of the storage portion 304C of the supply member 304 so that the tip end 320a is in contact with the plate cylinder inner peripheral surface 300b. The ink collecting means 514 may be used. The ink collecting member 320 is arranged so that the leading end 320a protrudes from the upper end portion 304E, and at least the leading end 320a side is rotated in the rotation direction of the plate cylinder 300 more than the ink supply unit 309 from the ink roller 302 to the plate cylinder inner peripheral surface 300b. It is provided in contact with the inner peripheral surface 300b of the plate cylinder located on the downstream side (in the direction of arrow G) so as to be elastically deformable. That is, the tip 320a of the ink recovery member 320 is pressed against the plate cylinder inner peripheral surface 300b by bending deformation. A facing surface 320c of the ink collecting member 320 that faces the outer peripheral surface 302a of the ink roller is configured as a guide surface.
[0053]
Even in such a configuration, the ink adhering to the inner peripheral surface 300b of the plate cylinder passes through the ink supply unit 309 and is scraped off by the tip 320a of the ink recovery member 320, and the ink supply roller 303 moves along the opposing surface 320c. Since it is guided to the vicinity, that is, to the ink reservoir 307, the spread of the excess ink 313a adhering to the plate cylinder inner peripheral surface 300b can be suppressed without providing a large mechanism such as the ink collecting means 314, and ink dripping or printing Not only can the stain inside the cylinder be extremely reduced, but the recovered excess ink 313a can be used again for printing, and waste of ink can be reduced. In addition, since the ink recovery member 320 is elastically pressed to the plate cylinder inner peripheral surface 300b at the tip 320a, the remaining ink 313a that has passed through the ink supply unit 309 is less scraped off, and the ink is efficiently transferred into the plate cylinder. It can be scraped off from the peripheral surface 300b.
[0054]
In the ink recovery means 514 shown in FIG. 13, the ink recovery member 320 is provided on the ink supply member 304. However, as shown in FIG. 14, the ink recovery member 320 may be provided on the frame 301 to serve as the ink recovery means 614. In FIG. 14, the base end 322b of the ink recovery member 322 is supported by the frame 301 via the bracket 321, and the tip 322a is held in contact with the plate cylinder inner peripheral surface 300b. The ink recovery member 322 is disposed so as to protrude the tip 322a from the bracket 321, and at least the tip 320a side is rotated in the direction of rotation of the plate cylinder 300 (arrow) than the ink supply unit 309 from the ink roller 302 to the plate cylinder inner peripheral surface 300b. A plate cylinder inner peripheral surface 300b located on the downstream side in the (G direction) is provided so as to be elastically deformable. The ink recovery member 322 is made of a thin plate material or film material, and the middle is bent in a “U” shape toward the ink roller 302, and the ink contact position between the leading end 322 a and the plate cylinder inner peripheral surface 300 b is supplied with ink. In addition to being closer to the vicinity of the portion 309, it is pressed against the inner peripheral surface 300b of the plate cylinder by elastic deformation due to the bent portion. For this reason, the opposing surface 322c of the ink recovery member 322 facing the outer peripheral surface 302a of the ink roller is configured as a guide surface.
[0055]
The bracket 321 is attached to the frame 301 with a screw, and the position of the bracket 321 can be moved by loosening the screw. The pressure contact state between the tip 322a of the ink recovery member 322 and the plate cylinder inner peripheral surface 300b is adjusted. Adjustable.
[0056]
Even in such a configuration, the ink adhering to the inner peripheral surface 300b of the plate cylinder passes through the ink supply unit 309, and is scraped off by the tip 322a of the ink recovery member 322, and the ink supply roller 303 along the opposing surface 322c. Since the ink is guided to the vicinity, that is, the ink reservoir 307, the spread of the excess ink 313a adhering to the plate cylinder inner peripheral surface 300b can be suppressed without providing a large mechanism such as the ink collecting means 314 as described above. In addition to being able to reduce dripping and stains inside the plate cylinder, the recovered excess ink 313a can be used again for printing, and ink waste can be reduced. In addition, since the ink recovery member 322 has its tip 322a elastically pressed against the inner peripheral surface 300b of the plate cylinder, the remaining ink 313a that has passed through the ink supply unit 309 is less scraped off and the ink is efficiently transferred into the plate cylinder. It can be scraped off from the peripheral surface 300b. Furthermore, since the pressure contact between the tip 322a of the ink recovery member 322 and the plate cylinder inner peripheral surface 300b can be adjusted by the bracket 321, the ink recovery member 322 is worn away by contact with the plate cylinder inner peripheral surface 300b. Even in this case, by moving the bracket 321, the pressure contact state between the tip 322 a and the plate cylinder inner peripheral surface 300 b can be recovered, and the excess ink 313 a can be recovered stably over a long period of time.
[0057]
In each embodiment described above, the layer thickness regulating roller 306 is used as the layer thickness regulating member. However, the layer thickness regulating member is not limited to the roller member, and a plate-like blade member such as the cleaning member 305 is used. The gap C may be formed in the vicinity of the outer peripheral surface 302a of the ink roller located downstream of the ink reservoir 307 in the rotation direction of the ink roller 302. Even when the blade member is used in this way, the layer thickness of the ink that is regulated when passing through the gap B and supplied to the outer peripheral surface 302a of the ink roller can be further regulated by the gap C at the secondary layer thickness. Can be thinned.
[0058]
In the stencil printing apparatus shown in FIG. 2, the plate cylinders 200 and 300 are disposed in the apparatus main body 100a so as to face each other with the sheet conveyance path 318 as a boundary. However, the present invention is not limited to this.
[0059]
For example, as shown in FIG. 15, plate cylinders 200 and 300, which are respectively arranged above and below the sheet conveyance path 318 in the apparatus main body 100Aa, are shifted in the sheet conveyance direction, and a printing pressure member is provided for each plate cylinder. Stencil printing apparatus 100A in which press rollers 113A and 113B are arranged to face each other, and the outer peripheral surfaces of the press rollers are provided on the outer peripheral surfaces 200a and 300a of the plate cylinder so as to be contactable and separable by a known contact and separation mechanism. May be applied. When the plate cylinders 200 and 300 are arranged so as to be shifted in the sheet conveyance direction, the conveyance of the printing sheet 106 is taken into consideration on the sheet conveyance path 318 between the plate cylinder 200 and the plate cylinder 300. A well-known intermediate transport device 114 including a suction fan and a porous transport belt that is rotated in the clockwise direction may be disposed. In FIG. 15, the member indicated by reference numeral 100Ab located below the apparatus main body 100Aa may be a paper feeding device capable of accommodating a large amount of printing paper 106, or a storage base for storing equipment and the like. good.
[0060]
As shown in FIG. 16, a plate cylinder 200 disposed above the sheet conveyance path 318, a plate making apparatus 102A related to this, a plate discharging apparatus 103A, a press roller 113A, a document reading unit 101, a registration roller pair 108A, paper discharge A first apparatus main body 100Ba having a conveying apparatus 111 and a paper discharge tray 112, a plate cylinder 300 disposed below the sheet conveying path 318, a plate making apparatus 102B related thereto, a plate discharging apparatus 103B, a press roller 113B, and a paper feed The characteristic part of the present invention may be applied to a stencil printing apparatus 100B including the tray 105, the sheet feeding / separating apparatus 107, and the second apparatus main body 100Bc having the registration roller pair 108B.
[0061]
In the stencil printing apparatus 100B, a sheet feeding device capable of storing a large amount of printing paper 106 or a storage table for storing equipment may be provided below the apparatus main body 100Ba as a member denoted by reference numeral 100Bb. In the stencil printing apparatus 100 </ b> B, since the paper transport path 318 is longer, it is preferable to provide the intermediate transport apparatus 114 and the paper guide guide plate pair 115 on the paper transport path 318 between the plate cylinder 200 and the plate cylinder 300. . The registration roller pair 108 </ b> A is disposed so as to face the conveyance path formed by the sheet guide guide plate pair 115.
[0062]
【The invention's effect】
According to the first and second aspects of the invention, the layer thickness of the ink supplied to the outer peripheral surface of the ink roller is set in the vicinity of the outer peripheral surface of the ink roller located downstream of the ink reservoir in the rotation direction of the ink roller. Since the layer thickness regulating member for regulating is provided, the ink whose layer thickness is regulated by the ink supply roller on the outer peripheral surface of the ink roller is further regulated by the layer thickness regulating member. The amount of ink supplied to the inner peripheral surface of the plate cylinder can be reduced, the excess ink is reduced, and the occurrence of problems due to the excess ink can be reduced.
[0063]
According to a third aspect of the present invention, in the stencil printing apparatus according to the first or second aspect, the layer thickness regulating member is provided so as to be rotatable relative to the ink roller in the vicinity of a portion facing the outer peripheral surface of the ink roller. Since it is a layer thickness regulating roller, the ink supplied to the ink roller is scraped off by the layer thickness regulating roller that rotates in the opposite direction to the rotation of the ink roller at the portion opposite to the layer thickness regulating roller, so that a reliable ink thin film The amount of ink supplied to the inner peripheral surface of the plate cylinder can be reduced, the excess ink is reduced, and the occurrence of problems due to the excess ink can be reduced.
[0064]
According to a fourth aspect of the present invention, in the stencil printing apparatus according to the third aspect, the ink swell portion is formed so as to cover the ink supply roller from below, and is disposed close to the outer peripheral surface of the ink supply roller. In addition, by having an ink supply member provided so as to be able to contact the outer peripheral surface of the layer thickness regulating roller, the vicinity of the ink supply roller is covered from below by the ink supply member. Leakage can be particularly prevented, excess ink due to dripping ink can be reduced, and occurrence of problems due to excess ink can be reduced.
[0065]
According to a fifth aspect of the present invention, in the stencil printing apparatus of the fourth aspect, the gap formed between the ink supply member and the outer peripheral surface of the ink supply roller is A, the outer peripheral surface of the ink supply roller and the ink roller When the gap formed between the outer peripheral surfaces is B and the gap formed between the outer peripheral surface of the ink roller and the outer peripheral surface of the layer thickness regulating roller is C, the relationship between the gaps is a relationship of A> B ≧ C. Since the gap C is equal to or smaller than the gap B, the layer thickness of the ink supplied to the ink roller is surely reduced by the rotation of the gap C and the layer thickness regulating roller, and the inner periphery of the plate cylinder The amount of ink supplied to the surface can be reduced, the excess ink is reduced, and the occurrence of problems due to the excess ink can be reduced.
[0066]
According to a sixth aspect of the present invention, in the stencil printing apparatus according to the fourth or fifth aspect, the ink supply member is provided so as to be able to approach and separate from the outer peripheral surface of the ink supply roller, and the ink supply member is moved close to and away from the outer peripheral surface. By having the gap adjusting means to adjust, the gap formed between the ink supply member and the outer peripheral surface of the ink supply roller can be adjusted. Since the kneading condition of the ink can be adjusted, loosening due to the kneading of the ink can be reduced, and contamination inside the plate cylinder due to dripping or scattering of the ink can be reduced.
[0067]
According to the seventh aspect of the present invention, in the stencil printing apparatus according to any one of the third to sixth aspects, the outer peripheral surface of the layer thickness regulating roller is in sliding contact with the downstream side in the rotation direction of the layer thickness regulating roller. The ink that is scraped off by the layer thickness regulating roller is scraped off from the outer circumferential surface of the roller by the cleaning member that returns the ink adhering to the outer circumferential surface of the layer thickness regulating roller to the ink supply member. Since the ink is returned to the member, ink is not wasted, and the state of the outer peripheral surface of the layer thickness regulating roller is good, and the error of the gap C due to the difference in the amount of ink adhering to the outer circumferential surface of the layer thickness regulating roller can be reduced. Further, since the ink dripping from the outer peripheral surface of the layer thickness regulating roller is prevented, the stain inside the plate cylinder is extremely reduced.
[0068]
According to an eighth aspect of the present invention, in the stencil printing apparatus according to any one of the first to seventh aspects, the ink immediately after printing remaining on the inner peripheral surface of the plate cylinder is recovered and returned to the ink supply roller. Since the collecting means is provided, spreading of the ink adhering to the inner peripheral surface of the plate cylinder can be suppressed, and excess ink on the inner peripheral surface of the plate cylinder can be recovered, so that problems caused by the excess ink can be reduced.
[Brief description of the drawings]
FIG. 1 is an enlarged view showing a configuration inside a plate cylinder to which the present invention is applied.
FIG. 2 is a schematic configuration diagram showing an embodiment of a stencil printing apparatus to which the present invention is applied.
FIG. 3 is an exploded perspective view showing a configuration of each roller, an ink supply member, and an ink supply pipe provided in a plate cylinder which is a main configuration of the present invention.
FIG. 4 is a front view showing the shape of a branch pipe.
FIG. 5 is a right side view of the branch pipe shown in FIG. 4;
FIG. 6 is an enlarged view showing another form of the spring portion.
FIG. 7 is an exploded perspective view showing the configuration of the ink collecting means.
FIG. 8 is a perspective view illustrating a configuration of a gap adjusting unit.
FIG. 9 is an enlarged cross-sectional view for explaining the operation of the present invention.
FIG. 10 is an enlarged view showing the relationship between the swing motion of the plate cylinder disposed below the paper transport path and the ink supply member.
FIG. 11 is an enlarged cross-sectional view showing the relationship between the operation of the gap adjusting means and the ink supply member.
FIG. 12 is an enlarged view showing an embodiment of an ink recovery member.
FIG. 13 is an enlarged view showing another form of the ink recovery member.
FIG. 14 is an enlarged view showing another form of the ink recovery member.
FIG. 15 is a schematic configuration diagram showing another embodiment of a stencil printing apparatus to which the present invention is applied.
FIG. 16 is a schematic configuration diagram showing another embodiment of the stencil printing apparatus to which the present invention is applied.
[Explanation of symbols]
100, 100A, 100B Stencil printing apparatus
106 printing paper
200, 300 plate cylinder
200b, 300b Plate cylinder inner peripheral surface
202, 302 Ink roller
206, 303 Ink supply roller
207, 307 Ink reservoir
301 Support member
302a Ink roller outer peripheral surface
303a Ink supply roller outer peripheral surface
304 Ink supply member
304D, 315C, 320C, 322C Guide surface
306 Layer thickness regulating member (Layer thickness regulating roller)
306a Outer surface of layer thickness regulating roller
309 Ink supply unit
314, 414, 514, 614 Ink recovery means
315, 320, 322 Ink recovery member
315a, 320b, 322b Base end of ink recovery member
315b Free end of ink recovery member
317 Energizing means
318 Paper transport path
320a, 322a Tip of ink recovery member
330 Extension of ink supply member
350 Clearance adjustment means
360 Ink well
A, B, C Clearance
D Ink roller rotation direction
G Rotation direction of plate cylinder

Claims (8)

A plate cylinder, an ink roller that is provided inside the plate cylinder and supplies ink to the inner peripheral surface of the plate cylinder, and the ink is provided with a slight gap so as to form a wedge-shaped ink reservoir between the ink roller and the ink roller. A stencil printing apparatus having an ink supply roller for supplying ink to the roller while regulating the layer thickness of the ink reservoir,
The thickness of the ink supplied to the outer peripheral surface of the ink roller is set in the vicinity of the outer peripheral surface of the ink roller between the ink supply roller and the downstream side of the ink supply roller in the rotation direction during printing of the ink roller. It has a layer thickness regulating member to regulate,
Than the gap by the upper Symbol ink supply roller gap by the layer thickness regulating member is set smaller, the ink supplied to the outer peripheral surface of the ink roller, is regulated by the layer thickness of the first order by the ink supplying roller, the layer A stencil printing apparatus characterized by being regulated to a second layer thickness by a thickness regulating member . In the stencil printing apparatus according to claim 1,
The plate cylinder is disposed below a paper conveyance path through which printing paper is conveyed, the ink roller is positioned close to the inner peripheral surface of the plate cylinder facing the paper conveyance path, and the ink supply roller and the layer thickness regulating member Is a stencil printing apparatus, which is arranged near the lower part of the ink roller. In the stencil printing apparatus according to claim 1 or 2,
The stencil printing apparatus, wherein the layer thickness regulating member is a layer thickness regulating roller provided so as to be rotatable relative to the ink roller in the vicinity of a portion facing the outer peripheral surface of the ink roller. In the stencil printing apparatus according to claim 3,
Ink provided with an ink squirting part, formed in a shape that covers the ink supply roller from below, and disposed close to the outer peripheral surface of the ink supply roller, and provided in contact with the outer peripheral surface of the layer thickness regulating roller A stencil printing apparatus comprising a supply member. In the stencil printing apparatus according to claim 4,
A gap formed between the ink supply member and the outer peripheral surface of the ink supply roller is A, a gap formed between the outer peripheral surface of the ink supply roller and the outer peripheral surface of the ink roller is B, and the outer peripheral surface of the ink roller. And a gap formed between the outer peripheral surfaces of the layer thickness regulating rollers and the relationship between the gaps is set as A> B ≧ C. In the stencil printing apparatus according to claim 4 or 5,
The stencil printing apparatus, wherein the ink supply member is provided so as to be close to and away from the outer peripheral surface of the ink supply roller, and has a gap adjusting means for moving the ink supply member close and away. In the stencil printing apparatus according to any one of claims 3 to 6,
A cleaning member provided on the downstream side of the rotation direction of the layer thickness regulating roller so as to be slidable in contact with the outer circumferential surface of the layer thickness regulating roller, and for returning ink adhering to the outer circumferential surface of the layer thickness regulating roller to the ink supply member; A stencil printing apparatus comprising: In the stencil printing apparatus according to any one of claims 1 to 7,
A stencil printing apparatus comprising ink collecting means for collecting the ink immediately after printing remaining on the inner peripheral surface of the plate cylinder and returning it to the ink supply roller.

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