JP3801239B2 - Stencil printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stencil printing apparatus.
[0002]
[Prior art]
As a conventional stencil printing device of this type, when printing is resumed by leaving it for a long time after continuous printing, it is possible to reduce the occurrence of scraped paper because a good printed matter is obtained from the time of printing. And those disclosed in Japanese Patent Laid-Open No. 4-129787. It is configured in the same manner as the embodiment of the present invention shown in FIGS. 1 to 4 and will be described with reference to this. This is made up of a porous rigid cylinder 2 wound around the outer periphery of the master 1 that has been made into a plate and cut to a predetermined length, a press roller 6 that presses the master 1 with the printing paper 15 wound around the cylinder 2, An ink supply means 4 for supplying ink from the inner periphery of the plate cylinder 2, and the tip of the master 1 wound around the plate cylinder 2 is held by a clamper 3 provided on the outer periphery of the plate cylinder 2, An elastic member 5 is provided adjacent to the downstream side in the rotational direction 2, and this elastic member 5 contacts the press roller 6 when the press roller 6 is separated from the plate cylinder 2 to rotate the press roller 6. Thus, the resist of the printing paper 15 is kept good.
[0003]
A press roller drive arm 50 that supports the press roller 6 is fixed to a support shaft 11a provided on a machine frame (not shown) that supports the arm 11, and a support arm 13 is supported on the press roller drive arm 50. And a stay 51 for transmitting the movement of the arm 11 to the support arm 13 is attached to the arm 11, and the stay 51 is conveyed to a nip portion between the plate cylinder 2 and the press roller 6. A paper conveyance guide plate 52 for guiding the printing paper 15 to be printed is attached.
[0004]
The driving means for inserting the flexible sheet member 19 extending over the entire length of the plate cylinder into the operating position between the plate cylinder 2 and the press roller 6 includes a first solenoid 22 and an operating rod 23 of the first solenoid 22. And a link 24 and a spring 25 provided on the operating rod 23, and an intermediate portion is bent along the press roller 6 at the lower end of the projecting portion 14 of the support arm 13 as shown in FIG. A plate member 20 that holds the sheet member 19 is pivotally supported, and the pivot 21 of the plate member 20 is rotated by the first solenoid 22 fixed to the support arm 13 via the operating rod 23 and the link 24. It has become. Further, a second solenoid 26 is provided for displacing a release member 27 that locks the lower end of the arm 11 and releases the stopper 10 that holds the press roller 6 at a position separated from the plate cylinder 2 without using the paper detection filter 9. Control means (not shown) for controlling the rotation of the plate cylinder 2 and the driving of the first solenoid 22 and the second solenoid 26 are provided.
[0005]
In such a case, the master 1 made by making a plate is wound around the outer periphery of the plate cylinder 2 and rotated, and the ink supplied by the ink supply means 4 oozes out from the through hole of the master 1 and press roller. 6 to print on the printing paper 15 pressed against the master 1. When printing is finished in this way and a plate setting command is issued after being left for a certain period of time, the plate cylinder 2 is rotated, and after the ink amount is detected by an ink detection member (not shown), the first solenoid 22 is turned on. Then, the sheet member 19 is inserted between the plate cylinder 2 and the press roller 6, and is displaced to the operating position shown in FIG. 2. Then, the second solenoid 26 is turned on and the cam follower 16 of the arm 11 protrudes from the cam 8. When the stopper 10 is released when the cam follower 16 is engaged and the cam follower 16 comes to a position facing the reference circle of the cam 8, the arm 11 is pulled by the spring 12 and rotates together with the support arm 13, and the press roller 6 presses the sheet member 19 against the master 1.
[0006]
The plate cylinder 2 pressed by the press roller 6 through the sheet member 19 and the master 1 rotates by a predetermined number of rotations set so that ink is sufficiently filled in the opening of the plate cylinder 2 according to the standing time. When the rotation is completed by the predetermined number of rotations, the second solenoid 26 is turned off and the stopper 10 becomes free, and the cam follower 16 of the arm 11 is engaged with the protruding portion of the cam 8. When the arm 11 rotates counterclockwise, the lower end is locked by the stopper 10, the press roller 6 is held at a separated position, the first solenoid 22 is turned off, and the sheet member 19 is pressed against the plate cylinder 2. It is released from the contact pressure with the roller 6, retreated from both, and held at the standby position.
[0007]
Thereafter, the master 1 is discharged by a plate discharging apparatus (not shown), and the new master is placed on the plate cylinder 2. Thereafter, the printing paper 15 is transported by passing over the paper transport guide plate 52 and fed to the nip portion between the plate cylinder 2 and the pressing roller 6 that presses, and when passing over the filter 9, the stopper 10 is fed. Is released, the press roller 6 is raised, the printing paper 15 is pressed against the master 1 and printing is performed, and printing becomes possible. At this time, the opening of the plate cylinder 2 and the outer surface of the plate cylinder 2 are filled with ink while the plate cylinder 2 is rotated by a predetermined number of revolutions before the master 1 is discharged. Since the new ink reaches the opening of the plate cylinder 2 and the outer surface of the plate cylinder 2, a good printed image can be obtained from the beginning of the plate.
[0008]
[Problems to be solved by the invention]
By the way, in such a thing, the press roller drive arm is fixed to the support shaft of the arm, and the support arm is attached to the press roller drive arm, and the stay transmits the movement of the arm to the support arm. Is attached to the arm, and the stay is provided with a paper conveyance guide plate for printing paper, so that the space of the passage when the sheet member is displaced is narrowed. Since the sheet member uses a flexible thin sheet such as polyethylene, polyester, fluororesin, or rubber, it is difficult to process the dimensional accuracy well, and the above materials are used. When the sheet member is at the standby position, the sheet member is likely to be deformed over time, and in particular, the intermediate bent portion is likely to be deformed to the opposite side of the press roller so as to be restored over time. When such a sheet member is displaced from the standby position retracted from the printing paper conveyance path to the operating position, the sheet member collides with the paper conveyance guide plate, and when in the operating position, the press roller and the plate cylinder Due to the contact pressure, it is deformed into a shape that follows the outer periphery of the press roller, and when retreating from the operating position to the standby position, the press roller comes into contact and cannot be displaced normally. Further, the sheet member deformed to the press roller side is rotated in the direction opposite to the plate cylinder by the elastic member of the plate cylinder during the subsequent normal printing, and is brought into contact with the press roller and the friction force of the press roller. Accordingly, there is a problem that the displaced printing sheet is displaced to the operating position, and the displaced sheet member does not normally convey the printing paper to be jammed.
[0009]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problems of the conventional stencil printing apparatus as described above, and the sheet member does not collide with the paper transport guide plate or the press roller at the time of plate-making, and the sheet member is moved to the operating position. Another object of the present invention is to provide a stencil printing apparatus that can be reliably displaced or retracted to a standby position and that does not cause jamming of printing paper during normal printing.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a plate cylinder of a porous rigid body that winds a master, which has been made into a plate and cut to a predetermined length, around the outer periphery, A press roller wound around the plate cylinder and pressing the master; an ink supply means for supplying ink from the inner periphery of the plate cylinder; a sheet member extending over the entire length of the plate cylinder; and the plate member and the press roller and operating position to be inserted between, the stencil printing machine having a drive means for advancing and retracting between a standby position away from the acting turned position, the sheet member is advanced into said operating position, and waits operating position A guide member that guides the sheet member when retracted to the position is provided. According to a second aspect of the present invention, there is provided a porous rigid plate cylinder wound around an outer periphery of a master that has been pre-cut and cut to a predetermined length, a press roller wound around the plate cylinder and pressing the master, Ink supply means for supplying ink from the inner periphery of the plate cylinder, a sheet member extending over the entire length of the plate cylinder, an operation position for inserting the sheet member between the plate cylinder and the press roller, and spaced apart from the operation position driving means for retracting to the standby position, the stencil printing machine having a sheet conveyance guide plate, a for guiding the printing paper is conveyed is located upstream of the press roller in the sheet transportation direction, said sheet member when advanced to the operating position, provided with a guide member for guiding the sheet member, the distal end portion of the sheet conveyance guide plate is bent at an acute angle downwardly along the sheet member, the sheet member or the operating position When retracted to the standby position, it is characterized in that it has formed a guide portion for guiding by contacting the sheet member. The invention described in claim 3 is a porous rigid plate cylinder wound around the outer periphery of a master that has been pre-cut and cut to a predetermined length, a press roller wound around the plate cylinder and pressing the master, Ink supply means for supplying ink from the inner periphery of the plate cylinder, a sheet member extending over the entire length of the plate cylinder, an operation position for inserting the sheet member between the plate cylinder and the press roller, and spaced apart from the operation position and drive means for advancing and retracting to the standby position, the stencil printing machine having a sheet conveyance guide plate, a for guiding the printing paper is conveyed is located upstream of the press roller in the sheet transportation direction, said sheet member distribution when advanced into said operating position, provided with a guide for guiding the sheet member, in front of the press roller, and below the sheet conveyance guide plate, obliquely upward to the press roller side It is, when the sheet member is retracted to the standby position from the operating position, and characterized in that a second guide member for guiding by contacting the sheet member. The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the sheet member is made of a flexible member.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention shown in FIGS. 1 to 4 is similar to the conventional one in many parts. Therefore, the same parts are referred to by the same reference numerals and the description is omitted, and different parts are mainly described. . 1 to 3 showing the first embodiment of the present invention, reference numeral 2 denotes a plate cylinder, 6 denotes a press roller which is disposed below and presses the plate cylinder 2 by a support arm 13 which engages with the arm 11, and 19 denotes A sheet member 19 which is movable between an operating position inserted between the plate cylinder 2 and the press roller 6 and a standby position spaced apart from between the plate cylinder 2 and the press roller 6; This seat member 19 is attached to the opposite side of the lever 21 pivoted to the machine frame of the device (not shown) by a pivot 21 on the opposite side to the pivot 21 and a pin 28 is attached to the lower portion of the lever 24. The pin 28 pivotally supports one end portion of the operating rod 23 of the first solenoid 22 mounted on the machine frame, and a guide member 53 and a guide portion 54 are provided on such an end.
[0012]
The sheet member 19 is formed by using a flexible sheet such as polyethylene, polyester, fluororesin, rubber, etc., bending the intermediate portion along the outer periphery of the press roller 6, and bonding it to the plate member 20. It is.
[0013]
The guide member 53 has a plate-like bent portion 53a that covers a portion through which the sheet member 19 passes with a gap of 0.5 to 2 mm along the outer periphery of the press roller 6, and a holding member 53b that holds the bent portion. The other side of the holding member 53b that does not hold the bent portion 53a is pivotally supported by a support shaft (not shown) provided on the support arm 13 and the shaft 6a of the press roller 6.
[0014]
The guide portion 54 is formed by bending the leading end portion of the sheet conveyance guide plate 52 along the back surface of the sheet member 19 with a predetermined distance from the sheet member 19.
[0015]
In such a case, when printing is started again after pausing printing for a certain period of time, the sheet member 19 is changed over time by the guide portion 54 when the plate cylinder 2 is rotated for the set number of rotations. Even if the sheet member 19 is deformed to the side, when the sheet member 19 is displaced to the operating position every rotation of the plate cylinder 2, the leading end of the sheet member 19 is guided by the guide portion 54 and smoothly does not collide with the sheet conveyance guide plate 52. The sheet member 19 can be reliably displaced to the operating position, and when the sheet member 19 is in the operating position and is deformed to the press roller 6 side and is displaced from that state to the standby position, the guide It can be reliably retracted without being in contact with the press roller 6 while being guided by the member 53, and jamming of printing paper does not occur during normal printing.
[0016]
Further, when the sheet member 19 is in the standby position and normal printing is performed, even if the sheet member 19 is deformed to the guide member 53 side by time-dependent restoration, the press roller 6 does not contact the press roller 6. The paper does not jump to the operating position by being dragged by the rotation of the print paper, and jamming of the printing paper does not occur.
[0017]
In the first embodiment, the guide member 53 and the guide portion 54 are assembled. However, the guide member 53 or the guide portion 54 may be provided alone.
[0018]
In the second embodiment shown in FIG. 4, the guide portion 54 of the first embodiment is removed, and a second guide member 54 ′ made of a plate-like member whose front end portion is bent from the middle toward the sheet member 19 is replaced with a sheet member. Positioned between the rear surface of 19 and the leading end of the remaining sheet transport guide plate 52 from which the guide portion 54 has been removed, is fixed to the stay 51, and the leading end 54a 'of the second guide member 54' There is no difference from the first embodiment except that it is provided so as not to protrude from the upper surface of the conveyance guide plate 52.
[0019]
In the second embodiment, the guide member 53 and the second guide member 54 'are assembled. However, the guide member 53 or the second guide member 54' may be provided alone.
[0020]
【The invention's effect】
The present invention is as described above, and the invention according to claim 1 is characterized in that a plate cylinder made of a porous rigid body for winding a master, which has been made into a plate and cut to a predetermined length, is wound around the outer circumference, and the plate cylinder is wound around the plate cylinder. A press roller that presses the master mounted on the plate cylinder, an ink supply means that supplies ink from the inner periphery of the plate cylinder, a sheet member that extends over the entire length of the plate cylinder, and the sheet member is inserted between the plate cylinder and the press roller. and an actuated position, the stencil printing machine having a drive means for advancing and retracting between a standby position away from the acting turned position, forward the sheet member to the operative position, and retracted from the operating position to the standby position when, therefore, characterized in that a guide member for guiding the sheet member, even the seat member is deformed to press the roller side can be reliably displace the seat member to the operating position, also during standby There is an effect that it is possible bets member to prevent jamming of the printing paper to be generated displaced in the operative position. According to a second aspect of the present invention, there is provided a porous rigid plate cylinder wound around an outer periphery of a master that has been pre-cut and cut to a predetermined length, a press roller wound around the plate cylinder and pressing the master, Ink supply means for supplying ink from the inner periphery of the plate cylinder, a sheet member extending over the entire length of the plate cylinder, an operation position for inserting the sheet member between the plate cylinder and the press roller, and spaced apart from the operation position driving means for retracting to the standby position, the stencil printing machine having a sheet conveyance guide plate, a for guiding the printing paper is conveyed is located upstream of the press roller in the sheet transportation direction, said sheet member when advanced to the operating position, provided with a guide member for guiding the sheet member, the distal end portion of the sheet conveyance guide plate is bent at an acute angle downwardly along the sheet member, the sheet member or the operating position When retracted to the standby position, which is characterized by forming the guide portion for guiding by contacting the sheet member, the invention of claim 3 is cleaved are plate making to a predetermined length A porous rigid plate cylinder wound around the outer periphery of the master, a press roller wound around the plate cylinder and pressing the master, an ink supply means for supplying ink from the inner periphery of the plate cylinder, and the overall length of the plate cylinder A sheet member extending across, an operating position for inserting the sheet member between the plate cylinder and the press roller, a driving means for advancing and retreating to a standby position separated from the operating position, and the paper sheet guide for guiding the printing paper is conveyed is located upstream, in the stencil printing machine having, when the sheet member is advanced into said operating position, the guide for guiding the sheet member With kicking, in front of the press roller, and below the sheet conveyance guide plate, it disposed obliquely upward to the press roller side, when the seat member is retracted to the standby position from the operating position, abutting the sheet member Since the second guide member for guiding is provided, the sheet member can be securely attached without contacting the sheet conveyance guide plate even if the sheet member is deformed to the sheet conveyance guide plate side with time. There is an effect that it can be displaced to the operating position or retracted to the standby position, and jamming of the printing paper can be prevented. The invention according to claim 4 is characterized in that the sheet member is made of a flexible member, and therefore there is an effect that the sheet member can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a first embodiment of the present invention.
FIG. 2 is a schematic longitudinal sectional view showing a state in which the same sheet member is displaced to an operating position.
FIG. 3 is a perspective view of the same sheet member.
FIG. 4 is a schematic longitudinal sectional view of the second embodiment.
[Explanation of symbols]
1 Master 2 Plate cylinder 4 Ink supply means 6 Press roller
11 Arm
13 Support arm
15 Printing paper
19 Sheet material
52 Paper transport guide plate
53 Guide member
54 Guide section
54 ' Second guide member

Claims (4)

A perforated rigid plate cylinder wound around the outer periphery of a master that has been pre-cut and cut to a predetermined length;
A press roller for pressing the master is wound around the plate cylinder,
An ink supply means for supplying ink from an inner periphery of the plate cylinder,
A sheet member extending across the plate cylinder entire length,
Drive means for advancing and retreating between an operating position for inserting the sheet member between the plate cylinder and the press roller, and a standby position separated from the operating position ;
In a stencil printing apparatus having
Said sheet member is advanced into said operating position, and when retracted from the operating position to the standby position, the stencil printing machine, characterized in that a guide member for guiding the sheet member. A perforated rigid plate cylinder wound around the outer periphery of a master that has been pre-cut and cut to a predetermined length;
A press roller for pressing the master is wound around the plate cylinder,
An ink supply means for supplying ink from an inner periphery of the plate cylinder,
A sheet member extending across the plate cylinder entire length,
An operating position for inserting the sheet member between the plate cylinder and the press roller, and a driving means for retracting to a standby position spaced from the operating position ;
A paper transport guide plate for guiding the print paper transported in the paper feed transport direction and positioned upstream of the press roller ;
In a stencil printing apparatus having
When the sheet member advances to the operating position, a guide member is provided for guiding the sheet member, and the front end portion of the paper transport guide plate is bent downward at an acute angle along the sheet member so that the sheet member is in the operating position. A stencil printing apparatus, characterized in that a guide portion is formed which guides a sheet member in contact when retracted from a standby position to a standby position . A perforated rigid plate cylinder wound around the outer periphery of a master that has been pre-cut and cut to a predetermined length;
A press roller for pressing the master is wound around the plate cylinder,
An ink supply means for supplying ink from an inner periphery of the plate cylinder,
A sheet member extending across the plate cylinder entire length,
An operating position for inserting the sheet member between the plate cylinder and the press roller; and a driving means for moving the sheet member forward and backward to a standby position separated from the operating position ;
A paper transport guide plate for guiding the print paper transported in the paper feed transport direction and positioned upstream of the press roller ;
In a stencil printing apparatus having
When the sheet member is advanced into said operating position, arranged provided with a guide for guiding the sheet member, in front of the press roller, and below the sheet conveyance guide plate, obliquely upward to the press roller side A stencil printing apparatus comprising: a second guide member that contacts and guides the sheet member when the sheet member is retracted from the operating position to the standby position .   4. The stencil printing apparatus according to claim 1, wherein the sheet member is made of a flexible member.

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