JP3737887B2 - Plate cylinder apparatus for stencil printing machine and operation method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary stencil printing machine, and more particularly to an improvement related to an ink supply structure of the plate cylinder apparatus.
[0002]
[Prior art]
As one of the plate cylinder devices of a rotary stencil printing machine that performs stencil printing using a rotating plate cylinder, the frame body has a peripheral wall portion of a porous structure and is rotatable around its own central axis. A plate cylinder supported by the frame body, and is supported by the frame so as to be rotatable about its own central axis parallel to the central axis of the plate cylinder so as to be able to selectively come into contact with the peripheral wall portion of the plate cylinder from the inside. An ink application roller, an ink amount control slit between the ink application roller and the ink application roller that is supported by the frame body in close proximity to the ink application roller in parallel with the ink application roller and a wedge-shaped cross section ink that converges on the ink control roller. A doctor rod for defining a reservoir gap; ink supply means for supplying ink to the ink reservoir gap; and drive means for driving the plate cylinder and the inking roller to rotate in the same rotation direction in association with each other. The plate cylinder and the in When the attachment roller is driven to rotate, ink is carried from the ink mass stored in the ink reservoir gap through the ink amount control slit to the outer peripheral surface of the ink application roller and conveyed to the peripheral wall portion of the plate cylinder. A configuration is known. (Japanese Utility Model Publication No. 60-26867)
[0003]
The stencil printing machine using the plate cylinder apparatus having the above-described configuration keeps the ratio of the rotation speed of the inking roller to the rotation speed of the plate cylinder constant and sets the ratio and the opening of the ink amount control slit to the optimum values. By doing so, there is a great advantage that a large number of printed materials can be printed at a constant and stable density.
[0004]
However, in the stencil printing machine using the plate cylinder apparatus having such a configuration, with the above-described configuration, printing is resumed after the stencil printing machine is started with a new stencil or after a long pause while holding the stencil. However, there is a problem that a considerable number of preliminary prints need to be performed before a normal print finish is achieved.
[0005]
Various measures for dealing with such problems and for increasing the rising speed of the stencil printing machine at the time of starting with a new stencil and at the time of resuming after a long pause are disclosed in JP-A-3-120073 and JP-A-4-296585. Japanese Laid-Open Patent Publication No. 6-135114, Japanese Laid-Open Patent Publication No. 9-11598, Japanese Laid-Open Patent Publication No. 9-174992, Japanese Patent No. 2593622, and Japanese Patent No. 2593623.
[0006]
[Problems to be solved by the invention]
Another object of the present invention is to speed up the start-up at the time of start-up by a new stencil of a stencil printing press using a plate cylinder device having the above-mentioned basic structure or when resuming printing after a long pause, especially, Separately from the ink supply control from the ink reservoir gap to the plate cylinder by the ink amount control slit, the ink is supplied from the ink reservoir gap to the plate cylinder through an ink supply path with an independent flow rate control. More specifically, the ink supply for solving the above-mentioned problems is performed when the stencil printing machine with a new stencil is started or when the printing is resumed after a long pause. In view of the fact that only a very short period of time is required compared to the total operation time, the components in the basic configuration of the conventional plate cylinder apparatus as described above are utilized to the maximum extent and with high controllability. Ink supply The ability yet in which it during its unactuated occupying most of the total operating time of the stencil printer provides cents additional ink supply device in a manner that does not interfere with the operation of the plate cylinder apparatus according to the basic configuration.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a frame, a plate cylinder having a peripheral wall portion of a porous structure and supported by the frame so as to be rotatable around its own central axis, An inking roller supported by the frame so as to be rotatable about its own central axis parallel to the central axis of the plate cylinder so as to be able to selectively contact the peripheral wall from the inside; And a doctor rod for defining a first ink amount control slit and a wedge-shaped cross-section ink reservoir gap converging between the first ink amount control slit and the ink application roller supported by the frame body in proximity to and parallel to the ink application roller. Ink supply means for supplying ink to the ink reservoir gap, and first drive means for associating the plate cylinder and the inking roller with each other and rotationally driving them in the same rotational direction. Ink roller rotates When moved, ink is carried on the outer peripheral surface of the inking roller through the first ink amount control slit and conveyed to the peripheral wall portion of the plate cylinder through the first ink amount control slit. For a plate cylinder for stencil printing machines,
The doctor rod is a cylindrical body supported by the frame so as to be rotatable around its own central axis parallel to the central axis of the inking roller at a portion defining the ink amount control slit, A closed position that contacts the circumferential wall surface of the cylindrical body portion of the rod and blocks the ink mass accumulated in the ink reservoir gap, and is spaced apart from the circumferential wall surface of the cylindrical body portion of the doctor rod and the circumferential wall surface of the cylindrical body portion A doctor bar that is movably supported by the frame body between an open position that defines a second ink amount control slit therebetween, and the doctor rod is selectively selected in the same rotational direction as the rotational direction of the inking roller. A second driving means for rotationally driving, a third driving means for driving the doctor bar between the closed position and the open position, and a stencil printing machine with a new stencil when starting or after a long pause Resume printing When the ink supply by the ink supply amount temporarily increased as compared with the ink supply amount by the first ink amount control slit is desired, the second driving means is operated to rotate the doctor rod. And a control means for operating the third drive means to move the doctor bar from the closed position to the open position. is there.
[0008]
According to the plate cylinder apparatus for a stencil printing machine having the above-described configuration, when the stencil printing machine is started by a new stencil which is intended to obtain a printed matter with a new content by installing a newly made stencil around the plate cylinder. The first ink during continuous operation after the start-up of the stencil printing machine, after printing with one stencil and after resuming printing for a long time with the stencil mounted on the plate cylinder Only when it is desired to supply ink by an ink supply amount that is temporarily increased compared to the ink supply amount by the amount control slit, the second drive means is operated to rotate the doctor rod and the third If the doctor bar is moved to an open position that defines the appropriate second ink amount control slit by operating the driving means, the doctor rod is supported on the outer peripheral surface of the doctor rod that rotates temporarily only during that time. In a state Can be replenished additional ink on the inking roller at a position of the outlet bypassing said from the ink reservoir voids first ink amount control slit.
[0009]
After the start of the stencil printing machine, the doctor bar is first returned to the closed position in contact with the doctor rod, the second ink amount control slit is closed, and then the doctor rod is rotated by at least one turn. Subsequently, it is preferable that an ink layer does not remain on the circumferential surface from the contact portion with the doctor bar to the exit of the first ink amount control slit as seen along the rotation direction of the doctor rod. . Thus, if the doctor bar is returned to the closed position in contact with the doctor rod and the second ink amount control slit is closed, the supply of these additional inks will be performed in the subsequent operation of the stencil printing machine. This arrangement does not interfere with the normal operation of the stencil printing machine. In this case, the doctor rod operates as a member for defining the first ink amount control slit in the normal operation of the stencil printing machine after the start-up, and at the same time as a member for extra ink supply. Is also effectively used.
[0010]
In the plate cylinder apparatus for a stencil printing press according to the present invention as described above, the second driving means includes a first gear concentrically coupled to the inking roller, and the doctor rod to the doctor rod. A second gear that is rotatably supported concentrically, and a first gear and a second gear that are rotatably supported by the frame and meshed with the first gear to the second gear. A third gear for transmitting a rotational force and a clutch for selectively connecting the second gear to a relationship for transmitting the rotational force to the doctor rod may be included. The doctor rod is preferably prevented from rotating by a one-way clutch against rotation in a direction opposite to the direction of rotation driven by the first, second and third gears.
[0011]
In this case, the ink reservoir gap is supported by the frame so as to be able to rotate about its own central axis parallel to the central axis of the inking roller through the central part of the ink mass stored therein. A lump rotation rod is provided, and the ink lump rotation rod may be concentric with the third gear and connected to the third gear so as to transmit a rotational force .
[0012]
Alternatively, the second driving means is supported by the frame body by a first gear concentrically coupled to the inking roller, a second gear concentrically coupled to the doctor rod, and the frame. A position that meshes with the first gear but does not mesh with the second gear, meshes with both the first gear and the second gear, and transmits rotational force from the first gear to the second gear. And a third gear selectively moved between the positions.
[0013]
Alternatively, the second driving means is supported by the frame body by a first gear concentrically coupled to the inking roller, a second gear concentrically coupled to the doctor rod, and the frame. A position where the first gear and the second gear are not meshed with each other and a position where the first gear and the second gear are meshed with each other and a rotational force is transmitted from the first gear to the second gear. And a third gear that is selectively moved between the two.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[0015]
FIG. 1 attached herewith is a side view with a partial schematic view showing one embodiment of a plate cylinder apparatus for a stencil printing press according to the present invention, and FIG. 2 shows an arrow along the arcuate cutting line in FIG. It is a figure which shows the one part expansion | deployment top view of the structure seen in the II-II direction with the schematic representation of the apparatus relevant to it.
[0016]
In these figures, the plate cylinder apparatus generally indicated at 10 has a plate cylinder 12, which is a view of the frame 14 so as to be rotatable about its own central axis O1. Is supported by a plate cylinder support not shown in FIG. 2 is a part of the frame body, and is particularly located inside the plate cylinder 12, and is used for the inking roller 16, doctor rod 20, and ink lump rotation described below. This is a portion that supports the in-plate cylinder ink supply means such as the rod 36. The plate cylinder 12 is formed in a porous structure at most of its peripheral wall portion excluding the stencil starting end mounting portion 13 provided along a part of the cylindrical bus bar. Inside the plate cylinder 12, an inking roller 16 is rotatable about its own central axis O2 parallel to the central axis O1 of the plate cylinder and as shown schematically in FIG. The shaft portion 18 is supported by the frame body 14 so as to be in contact with the peripheral wall portion of the trunk from the inside. In addition, as a method of selectively bringing the inking roller 16 into contact with the inner peripheral surface of the plate cylinder 12 only at the time of printing, a method of moving the inking roller 16 up and down with respect to the plate cylinder or an inking roller 16 for the plate The plate cylinder 12 is set in a non-contact state very close to the inner peripheral surface of the cylinder 12 and a plate cylinder 12 is opposed to the inking roller 16 by a back-pressing roller 72 described later being moved up and down with respect to the plate cylinder 12. There are various methods such as a method in which the inking roller 16 is brought into contact with the inner peripheral surface of the plate cylinder 12 by pushing up the peripheral wall partly upward, but details on this point are not directly related to the present invention. The details are omitted in the illustrative display as shown.
[0017]
In the plate cylinder 12, the doctor rod 20 is further in the vicinity of the inking roller 16 in parallel and is rotatable around its own central axis O 3 parallel to the central axis O 2 of the inking roller. It is supported by the body 14. Between the inking roller 16 and the doctor rod 20, an ink amount control slit 24 and an ink reservoir space 26 having a wedge-shaped cross section converging on the slit are defined, and this ink reservoir space has an axis of the plate cylinder. Ink is supplied from an ink supply pipe 28 arranged so as to extend in a direction through a plurality of holes 30 formed along the pipe. Ink supply performed through the ink supply pipe 28 is performed under the control of an ink pump operation control device not shown in the drawing from an ink pump not shown in the drawing, and the ink pump operation control device is Based on the signal from the ink sensor 34 that detects the size of the cross section of the ink mass 32 accumulated in the ink reservoir space 26, the ink sensor 34 detects the ink consumption associated with the operation of the stencil printing machine. The operation of the ink pump is controlled so that the size of the cross section of the ink mass is kept substantially constant. Note that the ink mass accumulated in the ink reservoir space 26 is in a state where both ends thereof are part of the frame body 14 and are blocked by the portions appearing as side plate elements in FIG.
[0018]
In the illustrated embodiment of the plate cylinder device, an ink mass rotating rod 36 located approximately in the center of the transverse cross section of the ink mass 32 formed in the ink reservoir space 26 inked its own central axis O4. The roller 16 is supported by the frame 14 at its shaft portion 38 so as to extend parallel to the center axis O2 of the roller 16 and to be rotatable around the center axis.
[0019]
As shown schematically in FIG. 2, the plate cylinder 12 is rotationally driven by a driving device 40 via a rotational driving force transmission system 42, and the inking roller 16 is, as one embodiment, a plate cylinder. 12, the plate cylinder 12 and the inking roller 16 are rotated at the speeds associated with each other, and the same as shown by the arrow in FIG. It is driven to rotate in the rotational direction. The operation of the driving device 40 is controlled by a control device 46.
[0020]
The inking roller 16 carries a gear 48 attached to the shaft portion 18 so as to transmit a rotational force . The doctor rod 20 carries a gear 50 mounted on the shaft portion 22 in a bearing manner so as to freely rotate on the shaft portion. The ink mass rotation rod 36 carries a gear 52 attached to the shaft portion 38 so as to transmit a rotational force . The gear 48 meshes with the gear 52, and the gear 52 meshes with the gear 50.
[0021]
The shaft portion 22 of the doctor rod 20 passes through the gear 50 and further extends upward in FIG. 2, and an annular clutch plate 54 and an electromagnetic clutch 56 are carried on the extending portion. The clutch plate 54 is fixed so as to transmit a rotational force to the gear 50, and can freely rotate together with the gear 50 on the shaft portion 22. The electromagnetic clutch 56 has a cylindrical main body portion fixed to the shaft portion 22 against movement in the rotational direction and the axial direction, and two conductive rings 58 provided to be spaced along the peripheral edge of the main body portion. In response to the current selectively supplied through the switch 63 controlled by the control device 46 through the conductive brushes 61 and 62 slidably contacting them and the conductive brushes 61 and 62, the annular clutch plate 65 is directed downward in the figure from the main body. The clutch plates are pushed out toward the clutch plate 54, and the clutch plates 50 and 54 are connected to each other so as to transmit the rotational force . Therefore, the electromagnetic clutch 56 is connected to the gear 50 in a relationship of transmitting the rotational force to the shaft portion 22 only when the switch 63 is closed by the control signal from the control device 46 and the current is supplied. .
[0022]
A one-way clutch 64 is provided at the bearing portion of the shaft portion 22 by the frame body 14 to allow the doctor rod 20 to rotate only in the direction of the arrow shown in FIG. Yes. By providing the one-way clutch 64, the doctor rod 20 is prevented from rotating in the clockwise direction in FIG. 1 by the rotation of the ink mass 32 in the ink reservoir space 26 during normal operation.
[0023]
Returning to FIG. 1, a dam plate-like doctor bar 66 is provided above the doctor rod 20 so as to extend substantially along the length of the doctor rod 20. The frame 14 is supported so as to be movable in the vertical direction. As shown in FIG. 1, the doctor bar 66 comes into contact with the outer peripheral surface of the doctor rod 20 along its one generatrix at its lower end when it is in its lowered position. The guide bar 66 is lowered by the actuator 70 as shown in the figure, and is pulled up from this position so that an ink amount control slit 74 (FIG. 3) can be formed between the lower end of the guide bar 66 and the doctor rod 20. . The operation of the actuator 70 is controlled by the control device 46.
[0024]
In the configuration of the plate cylinder apparatus as shown in the figure, during normal operation after the start of the stencil printing machine, the plate cylinder 12 is mounted counterclockwise in FIG. 1 with a stencil not shown in the figure. When it is driven to rotate in the direction, a known back-pressing roller 72 disposed below the plate cylinder device 10 avoids collision with the stencil plate start-end mounting portion 13 in the plate cylinder in response to the rotation. Only when the printing paper (not shown) is supplied between the cylinder 12 and the printing cylinder, the printing paper is reciprocated up and down so as to be pressed against the outer peripheral surface of the printing cylinder 12 and sequentially printed as the printing cylinder rotates. Printing on paper is performed. Thus, in response to the consumption of ink from the peripheral wall of the plate cylinder, the ink adding roller that rotates in association with the rotation of the plate cylinder 12 while the ink in the ink reservoir space 26 is measured by the ink amount control slit 24. 16 is supplied to the peripheral wall of the plate cylinder 12 and is swung by the ink mass rotating rod 36 in the ink reservoir space 26 so that the ink mass 36 has a substantially constant cross-sectional size at all times. In order to maintain the ink supply, ink is supplied from the ink supply pipe 28 under monitoring by the ink sensor 34.
[0025]
On the other hand, when the stencil printing machine with the new stencil is started or when printing is resumed after a long period of suspension, the actuator 70 is actuated by a command from the controller 46, and the doctor bar 66 is moved upward as shown in FIG. The ink amount control slit 74 is formed between the lower end and the doctor rod 20 at the same time, and at the same time, the switch 63 is switched by a command from the control device 46 to operate the electromagnetic clutch 56, and the clutch plate 65 is moved to the clutch plate 65. The state in which the rotation of the gear 50 is transmitted to the doctor rod 20 is achieved. When the plate cylinder 12 is driven to rotate in such a state, the ink and the ink amount control slit are measured on the outer peripheral surface of the inking roller 16 by the ink amount control slit 24 from the ink mass 32 in the ink reservoir space 26. Both the ink weighed at 74 and transported outward by the outer peripheral surface of the doctor rod 20 are supplied, and additional ink for the amount weighed by the ink amount control slit 74 is temporarily added to the peripheral wall portion of the plate cylinder. Supplied.
[0026]
Thus, even when printing with a new stencil is started or when printing is resumed after a long pause, the stencil printer can quickly rise to a start-up state capable of producing a print of the same quality during normal continuous operation. .
[0027]
FIG. 4 shows another embodiment of the gear mechanism for selectively driving the doctor rod 20 from the shaft portion 18 of the inking roller 16 in the embodiment shown in FIGS. It is an illustration side view shown. In FIG. 4, the parts corresponding to the parts shown in FIGS. In this embodiment, the gear 50 for rotationally driving the doctor rod 20 is always connected to the doctor rod 20 in a relationship for transmitting the rotational force, and is connected to the inking roller 16 in a relationship for always transmitting the rotational force. The gear 48 is selectively rotated through a gear 76 which is always meshed with the gear 48 but is selectively biased between the meshed state and the non-meshed state with respect to the gear 50. It has become. The gear 76 is supported by a lever 78 that rotates about the central axis O2 of the inking roller 16, that is, the central axis of the gear 48, so that the gear 78 can rotate about the axis. The position where the gear 76 meshes with the gear 50 as indicated by the solid line (actually the tooth is abbreviated because the tooth is abbreviated) and the gear 76 meshes with the gear 50 as indicated by the broken line in the figure. It is designed to be moved selectively between positions that do not exist. Of course, the actuator 80 is controlled by the control device 46 shown in FIGS. The gear 76 in this embodiment does not correspond to the gear 52 in the embodiment of FIGS.
[0028]
FIG. 5 is a view similar to FIG. 4 showing still another embodiment of a gear mechanism for selectively rotating the doctor rod 20 from the shaft portion of the inking roller 16. Also in FIG. 5, parts corresponding to those shown in FIGS. 1 to 4 are indicated by the same reference numerals as those in these figures. In this embodiment, the pivot axis O5 of the lever 78 is biased more than the pivot axis O2 of the inking roller 16, so that the gear 76 causes the gear 50 to shift to the gear 48 in response to the operation of the actuator 80. When it is to be driven further, it engages with both the gear 48 and the gear 50, and when it is not necessary to drive the gear 50, the gear 76 is disengaged from both the gear 48 and the gear 50. According to this embodiment, the movement of the additional member for selectively rotating the doctor rod 20 can be stopped during normal operation after the stencil printing machine is started up. The gear 76 in this embodiment does not correspond to the gear 52 in the embodiment of FIGS.
[0029]
FIG. 6 is a partial schematic plan view similar to FIG. 2 showing an embodiment in which a dedicated electric motor 82 for driving the doctor rod is provided to rotate the doctor rod 20 only when necessary. The electric motor 82 may be directly controlled by the control device 46 and may be driven to rotate in accordance with the pulling up of the doctor bar 66 at the start of printing with a new stencil plate or at the time of resuming printing after a long pause. In this case, when the motor 82 has a structure in which its output shaft is not driven reversely from the outside, such as an ultrasonic motor, or includes an irreversible reduction gear train such as a worm gear. The one-way clutch 64 shown in FIG. 2 may be omitted.
[0030]
Thus, according to the present invention, the doctor rod is configured so as to be selectively rotatable, and a movable doctor bar is combined with the doctor rod so that a new printing can be performed again after a single printing. Even when printing is started with a new stencil plate made in the same way, stencil printing without waste by trial printing can be performed with the number of trial printings until a predetermined good printing finish is obtained almost zero.
[0031]
Although the present invention has been described in detail with respect to several embodiments, it will be apparent to those skilled in the art that various other embodiments are possible within the scope of the present invention.
[Brief description of the drawings]
FIG. 1 is an illustrative side view showing one embodiment of a plate cylinder apparatus for a stencil printing machine according to the present invention only in the main part according to the present invention.
FIG. 2 is a plan view partially showing in schematic view the main part of the configuration for selective driving of the doctor rod in the plate cylinder apparatus shown in FIG. 1; The figure corresponding to the arrow view by II.
FIG. 3 is a diagram illustrating the plate cylinder apparatus illustrated in FIG. 1 in a state in which an additional ink supply operation is temporarily performed.
FIG. 4 is a schematic view showing another embodiment for selective rotation driving of a doctor rod.
FIG. 5 is a schematic view showing still another embodiment for selective rotation driving of a doctor rod.
6 is a partial schematic plan view similar to FIG. 2 showing still another embodiment of the configuration for selective driving of the doctor rod in the plate cylinder apparatus shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Plate cylinder apparatus 12 ... Plate cylinder 13 ... Stencil start edge attaching part 16 ... Inking roller 18 ... Ink roller shaft 20 ... Doctor rod 22 ... Doctor rod shaft 24 ... Ink amount control slit 26 ... Ink storage space 28 ... Ink supply tube 30 ... Hole 32 ... Ink mass 34 ... Ink sensor 36 ... Ink mass rotation rod 38 ... Shaft 40 ... Drive devices 42, 44 ... Rotation drive force transmission system 46 ... Control devices 48, 50, 52 ... Gear 54 ... Clutch plate 56 ... Electromagnetic clutch 58, 60 ... Conductive ring 61, 62 ... Conductive brush 63 ... Switch 64 ... One-way clutch 66 ... Doctor bar 68 ... Guide 70 ... Actuator 72 ... Back press roller 74 ... Ink amount control slit 76 ... Gear 78 ... Lever 80 ... Actuator 82 ... Dr. Rod drive motor

Claims (7)

A frame body, a plate cylinder having a peripheral wall portion of a porous structure and supported by the frame body so as to be rotatable about its own central axis, and capable of selectively abutting from the inside to the peripheral wall portion of the plate cylinder An inking roller supported by the frame so as to be rotatable about its own central axis parallel to the central axis of the plate cylinder; and the frame in the plate cylinder in close proximity to the inking roller A first ink amount control slit supported by the body and a doctor rod for defining an ink reservoir gap having a wedge-shaped cross section converging between the first ink amount control slit and an ink supply means for supplying ink to the ink reservoir gap And a first driving means for associating the plate cylinder and the inking roller with each other and rotationally driving the same in the same rotation direction, and when the plate cylinder and the inking roller are driven to rotate, the ink reservoir Accumulated in the gap In the stencil printing machine plate cylinder device configured to be conveyed is supported on the outer peripheral surface to the peripheral wall of the plate cylinder of the inking roller the ink from ink mass via the first ink amount control slit,
The doctor rod is a cylindrical body supported by the frame so as to be rotatable around its own central axis parallel to the central axis of the inking roller at a portion defining the ink amount control slit, A closed position that contacts the circumferential wall surface of the cylindrical body portion of the rod and blocks the ink mass accumulated in the ink reservoir gap, and is spaced apart from the circumferential wall surface of the cylindrical body portion of the doctor rod and the circumferential wall surface of the cylindrical body portion A doctor bar that is movably supported by the frame body between an open position that defines a second ink amount control slit therebetween, and the doctor rod is selectively selected in the same rotational direction as the rotational direction of the inking roller. A second driving means for rotationally driving, a third driving means for driving the doctor bar between the closed position and the open position, and a stencil printing machine with a new stencil when starting or after a long pause Resume printing When the ink supply by the ink supply amount temporarily increased as compared with the ink supply amount by the first ink amount control slit is desired, the second driving means is operated to rotate the doctor rod. A plate cylinder device for a stencil printing machine, further comprising a control means for operating the third driving means to move the doctor bar from the closed position to the open position. The second driving means includes: a first gear concentrically coupled to the inking roller; a second gear rotatably supported by the doctor rod concentrically with the doctor rod; and the frame body A third gear that is rotatably supported by the first gear and meshes with the second gear and transmits the rotational force from the first gear to the second gear, and the second gear. 2. A plate cylinder device for a stencil printing machine according to claim 1, further comprising a clutch selectively connected to the doctor rod in a relationship of transmitting a rotational force .   3. A one-way clutch that prevents the doctor rod from rotating in a rotation direction opposite to a rotation direction that is rotationally driven through the first, second, and third gears. Plate cylinder for stencil printing machines. The ink reservoir gap is used for rotating an ink mass supported by the frame so as to be rotatable about its own central axis parallel to the central axis of the ink application roller through the central portion of the ink mass stored therein. 3. The rod according to claim 2, wherein a rod is provided, and the ink mass rotation rod is concentric with the third gear and is connected to the third gear in a relationship of transmitting rotational force . Plate cylinder device for stencil printing machines.   The second driving means includes a first gear concentrically coupled to the inking roller, a second gear concentrically coupled to the doctor rod, and the first gear supported by the frame body. Between the position that meshes with the second gear but does not mesh with the second gear and the position that meshes with both the first gear and the second gear and transmits the rotational force from the first gear to the second gear. 3. A plate cylinder apparatus for a stencil printing machine according to claim 1, further comprising a third gear selectively moved to the stencil printing machine.   The second driving means includes a first gear concentrically coupled to the inking roller, a second gear concentrically coupled to the doctor rod, and the first gear supported by the frame body. And a position where it does not mesh with any of the second gear and a position where it meshes with both the first gear and the second gear and transmits rotational force from the first gear to the second gear. 2. A plate cylinder apparatus for a stencil printing machine according to claim 1, further comprising a third gear which is selectively moved. The method of operating the plate cylinder apparatus for a stencil printing machine according to any one of claims 1 to 6, wherein when the period during which ink supply with the ink supply amount temporarily increased is desired ends, the doctor bar the driven to the closed position closing said second ink amount control slit, operating method characterized by thereafter stopping the rotation of the doctor rod after at least rotated one rotation slightly less than the doctor rod subsequently .

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