JP3897432B2 - Plate cylinder support device for stencil printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate cylinder support device for a stencil printing machine which performs stencil mastering having a thermoplastic resin film by hot perforation and winding the stencil master around a porous cylindrical plate cylinder for printing.
[0002]
[Prior art]
Conventionally, as this kind of stencil printing machine, a thermal digital stencil printing machine is well known, and there are parts similar to those of the first embodiment of the present invention shown in FIG. It will be described with reference to it. 1 is a plate cylinder, 2 is an ink roller for supplying ink to the inner peripheral surface of the plate cylinder 1, 3 is a doctor roller provided with a slight gap from the outer surface of the ink roller 2, 4 is an ink reservoir, and 5 is an ink reservoir Support shaft made of pipe, 6 is stage, 7 is clamper, 8 is master, 9 is platen roller, 10 is thermal head, 11 is transport roller, 12 is cutter, 13 is guide plate, 14 is press roller, 15 is resist Rollers 16 indicate paper.
[0003]
In this case, the plate cylinder 1 has a structure in which a mesh screen made of a resin or a metal net is wound around a porous support cylinder, and the master 8 has a thickness of about 1 to 3 μm. Heating the film surface of a master base paper with a laminated structure in which a Japanese paper fiber or synthetic fiber of a porous support or a mixture of Japanese paper and synthetic fiber is bonded to a plastic resin film while contacting the heating element of the thermal head 10 The master 8 is wound around the plate cylinder 1, and ink is supplied from the support shaft 5 provided inside the plate cylinder 1, and the paper 16 is pressed by pressing means such as a press roller 14. Is continuously pressed to cause ink to ooze out from the plate cylinder opening and the master perforation, and printing is performed.
[0004]
In recent years, even stencil printers have performed two-color printing or color printing using a plurality of inks. Therefore, when printing in a single color as in the prior art, there was no problem even if the plate cylinder 1 was fixed. However, when printing with color change, clean the previous ink from the plate cylinder. It is necessary to remove, and the removal work becomes very troublesome, and this is a problem that the stencil printing machine is integrated with the stencil printing machine and becomes larger than before, and jam paper is removed. In order to perform processing easily, it has become necessary to attach and detach the plate cylinder.
[0005]
[Problems to be solved by the invention]
Therefore, as what can satisfy such a need, one disclosed in Japanese Patent Publication No. 62-28758 has been proposed, which is as shown in FIG. 51 extends in the axial direction of the frame, includes a frame having a frame bar 55 and a connecting plate 60, and a plate cylinder 51 on the machine body, and is guided and held so as to be movable between a printing position inside the machine and a drawing position outside the machine. When the plate cylinder 51 is in the printing position, the guide holding means to be connected to the end cover 54, the plate cylinder support shaft 63, the flange portion 64 of the plate cylinder 51 are detachably connected to the rotational power transmission relationship, and from the machine body A drive shaft 65 rotatably supported by a printing machine side plate 52 that supports the frame bar 55, the connection plate 60, and the bearing member 62, which are supported rotatably and simultaneously extend into the plate cylinder 51. And an engaging pin 66 attached thereto. Reference numeral 53 denotes a keyway provided in the plate cylinder support shaft 63 with which the engagement pin 66 is detachably engaged.
[0006]
When the plate cylinder 51 is in the printing position, the drive shaft 65 and the engagement pin 66 simultaneously (1) rotate the end cover 54, the plate cylinder support shaft 63, and the flange portion 64 of the plate cylinder 51 ( 2) The plate cylinder 51 is supported on the machine body. (3) The frame bar 55, the connecting plate 60 and the bearing member 62 are supported on the machine body. In other cases, the frame is moved together with the plate cylinder 51 to the outside of the machine. In this way, by preparing a plurality of plate cylinders of each ink color and inserting and removing the plate cylinders, color change printing can be easily performed.
[0007]
However, in a normal stencil printing machine, printing is performed by leaching ink while pressing a pressing means such as a press roller 14 or an impression cylinder having substantially the same diameter as the printing cylinder 1 from below the printing cylinder 1. When the shaft portion that was rotatably supported was firmly fixed, there was no problem, but a protruding pin or the like as in the proposed printing machine was inserted into the plate cylinder 1, and the plate cylinder 1 In the case of a cantilever structure that receives the load of the load, the load is transmitted to the rotating part, and it receives the strong pressing force that is generally about 10 to several tens of kgf by the press roller 14 etc. There is a problem that damage is easily generated in the rotation transmission portion.
[0008]
In addition to this, the one disclosed in Japanese Patent Laid-Open No. 8-39918 has been proposed, which is as shown in FIG. A movable rail 74 is attached to the frame plate 73, and the movable rail 74 moves in the axial direction of the plate cylinder 71 along a guide rail 76 fixed to the side plate 75 of the printing press. A follower gear 77 is attached to the cylinder 71, and a drive gear 78 that meshes with the follower gear 77 of the side plate 75 of the printing press is pivotally supported and a guide bush 79 is attached.
[0009]
In this proposed printing machine, the movable rail 74 is moved to the left along the guide rail 76, moved to the position outside the machine where the plate cylinder 71 is removed from the printing machine body, and moved to the right in the opposite direction. The rotary shaft 72 is engaged with the guide bush 79 and moved to a printing position where the driven gear 77 meshes with the drive gear 78. In this way, by preparing a plurality of plate cylinders of each ink color and inserting and removing the plate cylinders, color change printing can be easily performed.
[0010]
However, in the case of transmitting power using a gear mechanism like the proposed printing machine, it is inevitable that the backlash between the gears will cause backlash. There is a problem that (play) increases, variation in the position of the printed image with respect to the paper increases, and noise during driving occurs.
[0011]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the problems of the conventional examples as described above, prevent the rotation transmission portion from being damaged, and prevent stencil printing plates from generating noise during driving. To provide a trunk support device.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a stencil printing machine in which a support frame that rotatably supports a plate cylinder is mounted on a printing machine body so as to be movable in the axial direction of the plate cylinder. According to the first aspect of the present invention, both side plates of the plate cylinder are provided between both side plates of the support frame, and are rotatably supported by a support shaft extending in the axial direction of the plate cylinder. A bearing convex portion provided on the side plate of the plate cylinder is rotatably supported by the support cylinder portion, and an engaging portion is mounted on a radially outer surface of the bearing convex portion. The side plate of the printing press facing the one side plate of the frame is provided with a support flange that is slidably fitted to the support tube portion, and a drive member of the drive means is disposed, and the drive member is engaged with the engagement portion. Engageable parts that can be detached are provided. Engaged portion supports the plate cylinder engage each other when the plate cylinder is in the printing position, and the drive member of the drive means when the plate cylinder is in the printing position is connected to the side plate of the plate cylinder, The driving force is transmitted to the plate cylinder.
[0013]
The invention according to claim 2 is the invention according to claim 1, wherein a ring-shaped flange is fixed to one end of the plate cylinder, and a side plate of the plate cylinder is attached to this flange so as to be movable in the axial direction . It is characterized by.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
In each embodiment shown in the drawings, the same reference numerals are given to the conventional and similar parts, and the description thereof will be omitted, and different parts will be mainly described.
[0020]
In the first embodiment of the present invention as shown in FIG. 1, when a document is set in the document reading section and a start signal is issued, the used master mounted on the plate cylinder 1 is rotated. The plate cylinder 1 is peeled off from the surface of the plate cylinder 1 and discarded, and the plate cylinder 1 is rotated and stopped until the clamper 7 is almost directly above.
[0021]
Clamper 7 When the plate cylinder 1 is stopped is released to open becomes feed stand state, wherein the original is sent to the document reading unit, such as over a plate making controller, heating elements of the thermal head 10 in accordance with image information The platen roller 9 and the conveyance roller 11 convey the master 8, the thermoplastic resin film of the master 8 is heated and perforated, and plate making is performed by the guide plate 13. Guided to the clamper 7.
[0022]
If it is determined that the leading edge of the master 8 has reached the stage 6, the clamper 7 is closed and the leading edge of the master 8 is sucked and clamped, and the plate cylinder 1 resumes rotation at a speed substantially equal to the master conveying speed. The master 8 thus made is wound. When it is determined that the plate making is completed, the cutter 12 is operated, the master 8 is cut, the platen roller 9 and the transport roller 11 are stopped, and the cut master is pulled out by the plate cylinder 1 and the plate cylinder 1 is cut. The winding to is completed.
[0023]
When the winding of the master 8 around the plate cylinder 1 is completed, the paper 16 is fed and timed by the registration roller 15 and inserted between the plate cylinder 1 and the press roller 14 to feed the paper 16. Is detected, the press roller 14 is unlocked and lifted, and the paper 16 is continuously pressed against the plate cylinder 1 so that the wound master 8 comes into close contact with the plate cylinder 1 and the paper 16 is peeled off and discharged to the discharge tray. Printing is performed in which the wound master 8 is filled with ink, and the press roller 14 is separated to return to the initial state to enter a print standby state. Thereafter, predetermined printing is performed.
[0024]
FIG. 2 shows the plate cylinder support device of the above-described embodiment. A bearing convex portion 21 is provided on the outer surface of the central portion of the side plate 20 of the plate cylinder 1, and the central hole of the bearing convex portion 21 is a support shaft 22. The lower hole of the frame plate 24 as a side plate of the support frame of the plate cylinder is supported by the bearing 23 mounted on the outer peripheral surface of the bearing convex portion 21 and the upper portion of the frame plate 24 is The plate is attached to a movable rail 28 that moves in the axial direction of the plate cylinder 1 along a guide rail 26 fixed to a side plate 27 of the printing press. A support plate 25 for the ink roller 2 is attached to the support shaft 22.
[0025]
One side plate 27 of the printing press is provided with an engagement hole 29 capable of turning and disengaging in the bearing 23 of the one side plate 20 of the plate cylinder 1, and a driving means 31 is disposed in the engagement hole 29. The drive means 31 has a drive shaft 32 and a rotating disk 33 attached to the tip of the driving means 31, and an engaging projection 34 is provided at an eccentric position of the rotating disk 33, so that the one side plate 20 of the plate cylinder 1 The bearing convex portion 21 is provided with an engaging concave portion 36 that can be engaged and disengaged from the engaging convex portion 34.
[0026]
In this embodiment in the state shown in the figure, when bringing it to the printing position, the plate cylinder 1 is moved in the same direction by moving the movable rail 28 to the left along the guide rail 26 to move the plate cylinder 1 in the same direction. The bearing 23 of the side plate 20 is rotatably fitted in the engagement hole 29 of the side plate 27 of the printing press, and is driven by the engagement recess 36 provided on the bearing projection 21 of the side plate 20 of the plate cylinder 1. The engaging projection 34 of the means 31 is engaged.
[0027]
When the printing operation is performed in such a state, the plate cylinder 1 is rotated by the engaging convex portion 34 that is rotated by the operation of the driving means 31, and the plate cylinder 1 is firmly supported by the frame plate 24. A strong pressing force repeatedly applied by the press roller 14 and the like generated during the printing operation in this way is received by the side plate 20 of the plate cylinder 1 through the bearing 23 and transmitted to the rotation transmitting portion of the driving means 31. The rotation transmission unit is not damaged.
[0028]
When the predetermined printing operation is completed and the plate cylinder 1 is replaced with another plate cylinder 1, the plate cylinder 1 is moved to the right by the procedure opposite to the above, and the bearing 23 of the side plate 20 and the printing are printed. The engagement of the side plate 27 of the machine with the engagement hole 29 and the engagement of the engagement concave part 36 of the bearing convex part 21 and the engagement convex part 34 of the drive means 31 are released, and the frame is moved together with the plate cylinder 1. By moving to the outside and preparing a plurality of plate cylinders of each ink color in this way, and removing and inserting the plate cylinders, color change printing can be easily performed.
[0029]
In the case of the jam processing of the paper 16, the plate cylinder 1 is extracted after the plate cylinder 1 is stopped at a predetermined position, and after the processing is completed, it is inserted into the original position and printing is performed.
[0030]
In the second embodiment of the present invention shown in FIG. 3, instead of fitting the bearing 23 of the side plate 20 of the plate cylinder 1 into the engagement hole 29 of the one side plate 27 of the printing press, an annular ring is formed around the engagement hole 29. The support flange 37 is provided so as to be fitted to the bearing 23, and this does not place a burden on the side plate 27 of the printing press, except for the difference from the first embodiment.
[0031]
A third embodiment of the present invention shown in FIGS. 4 and 5 is the same as the second embodiment except that a retaining member 38 is attached to the outer surface of the bearing convex portion 21 of the side plate 20 of the plate cylinder 1. As shown in FIG. 4, the pin-shaped main body 39 is provided with a groove portion 41. On the other hand, the side plate 27 of the printing press has a retaining annular body 42 attached to the outer surface thereof, and the retaining annular body 42 is a laterally facing annular portion. And a guide portion 43 formed inwardly at the tip thereof. The guide portion 43 is provided with a notch 44 having substantially the same diameter as the pin-shaped main body 39 of the retaining member 38.
[0032]
In such a case, when the plate cylinder 1 is moved to the printing position, the pin-shaped main body 39 passes through the notch 44 when the pin-shaped main body 39 of the retaining member 38 is set to a position facing the notch 44 of the retaining annular body 42. To reach the print position. Here, the groove portion 41 of the pin-shaped main body 39 and the guide portion 43 of the retaining annular body 42 are aligned, and the plate cylinder 1 rotates while being guided by the groove portion 41 engaged with the guide portion 43 during printing. When moving out of the machine, the groove part 41 and the notch 44 of the guide part 43 are moved in alignment with each other. In this way, the plate cylinder 1 is the printing machine except for the position of the pin-shaped main body 39 other than the position of the notch 44. The point that can be prevented from being pulled out from the main body is the only difference from the second embodiment.
[0033]
In the fourth embodiment of the present invention shown in FIG. 6, in the second embodiment, a ring-shaped flange 46 is fixed to one end of the plate cylinder 1, and the side plate 20 of the plate cylinder 1 can move in the axial direction on this flange 46. Installed on. A support cylinder 47 is attached to the lower part of the frame plate 24, and the bearing projection 21 of the side plate 20 is rotatably supported by the support cylinder 47 via the bearing 23, and the diameter of the bearing projection 21 of the side plate 20 is An engaging projection 34 is attached to the outer surface in the direction .
[0034]
On the other hand, the rotary plate 33 of the driving means 31 is provided with a radial engagement groove 48 in which the engagement convex portion 34 can be fitted and removed, and the one side plate 27 of the printing machine slides on the support cylinder portion 47 of the frame plate 24. An annular support flange 37 to be fitted and an engagement pin 49 are provided. The frame plate 24 is provided with an engagement hole 50 into which the engagement pin 49 is slidably fitted.
[0035]
In this embodiment, a plurality of plate cylinders of each ink color are prepared in the same manner as in each embodiment, and color change printing can be easily performed by inserting and removing the plate cylinder. Since 46 is movable in the axial direction, the image position can be adjusted by adjusting the position of the plate cylinder 1 in the axial direction by an image position adjusting device (not shown). In some cases, the engaging projections 34 engage with the radial engaging grooves 48, so that precise processing for accurately matching the relative positions in the radial direction is not required, and the support cylinder 47 is supported. By engaging with the flange 37, it is possible to more effectively prevent the strong pressing force generated during the printing operation from being transmitted to the rotation transmission portion of the drive means 31, and damage to the rotation transmission portion can occur. There is no.
[0036]
【The invention's effect】
The present invention is as described above, and the invention according to claim 1 is such that both side plates of the plate cylinder are provided between both side plates of the support frame so as to be rotatable about a support shaft extending in the axial direction of the plate cylinder. A support cylinder portion is attached to one side plate of the support frame, and a bearing convex portion provided on the side plate of the plate cylinder is rotatably supported by the support cylinder portion, and a radially outer surface of the bearing convex portion is supported. On the other hand, a support flange that is slidably fitted to the support cylinder portion is provided on the side plate of the printing press that faces the one side plate of the support frame, and the drive member of the drive means is disposed. The drive member is provided with an engaged portion that can be disengaged from and disengaged from the engaging portion, and the engaging portion and the engaged portion are engaged with each other when the plate cylinder is in the printing position. cylinder to the support, also the drive member is plate of said drive means when the plate cylinder is in the printing position Is connected to the side plates are adapted to the driving force to the plate cylinder is transferred, an invention according to claim 2, in the invention described in claim 1, a ring-shaped flange at one end of the plate cylinder Since the side plate of the plate cylinder is fixed to this flange so as to be movable in the axial direction , the pressing force does not act on the rotational drive part, and it is not damaged by the impact received from the pressing member. There is. In addition, since the engaging portion and the engaged portion are engaged when in the printing position, there is no need for precise processing for accurately matching the relative positions in the radial direction. There is an effect that the image position can be adjusted by a simple operation of moving the ring-shaped flange fixed to one end of the cylinder in the axial direction with respect to the side plate of the plate cylinder.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a stencil printing machine to which the present invention is mounted.
FIG. 2 is a longitudinal sectional front view of an essential part of the first embodiment of the present invention.
FIG. 3 is a longitudinal front view of an essential part of a second embodiment of the present invention.
FIG. 4 is a longitudinal sectional front view of an essential part of a third embodiment of the present invention.
FIG. 5 is a perspective view of the main part of the above.
FIG. 6 is a longitudinal sectional front view of an essential part of a fourth embodiment of the present invention.
FIG. 7 is a longitudinal sectional front view of a main part of a first example of a plate cylinder support device of a conventional stencil printing machine of the same type as the present invention.
FIG. 8 is a longitudinal sectional front view of an essential part of a second example of a plate cylinder support device of a conventional stencil printing machine of the same type as the present invention.
[Explanation of symbols]
1 Plate cylinder 2 Ink roller 3 Doctor roller 4 Ink reservoir 5 Support shaft 6 Stage 7 Clamper 8 Master 9 Platen roller 10 Thermal head
11 Transport roller 12 Cutter
13 Guide plate 14 Press roller
15 Registration roller 16 Paper
20 Plate cylinder side plate 21 Bearing protrusion
22 Support shaft 23 Bearing
24 Frame plate 25 Ink roller support plate
26 Guide rail 27 Printing machine side plate
28 Movable rail 29 Engagement hole
31 Drive means 32 Drive shaft
33 Turntable 34 Engaging projection
36 Engagement recess 37 Support flange
38 Retaining member 39 Pin-shaped body
41 Groove 42 Retaining ring
43 Guide 44 Notch
46 Flange 47 Support cylinder
48 Engagement groove 49 Engagement pin
50 engagement hole

Claims (2)

In a stencil printing machine in which a support frame that rotatably supports a plate cylinder is attached to the printing machine body so as to be movable in the axial direction of the plate cylinder,
Both side plates of the plate cylinder are provided between both side plates of the support frame, are rotatably supported by a support shaft extending in the axial direction of the plate cylinder, and a support cylinder portion is attached to one side plate of the support frame. A bearing convex portion provided on the side plate of the plate cylinder is rotatably supported by the portion, and an engaging portion is attached to a radially outer surface of the bearing convex portion, while facing one side plate of the support frame. A support flange that is slidably fitted to the support cylinder portion is provided on a side plate of the printing press, and a drive member of a drive unit is arranged, and the drive member can be engaged with and disengaged from the engagement portion. parts are provided, the engaging portion and the engaged portion supports the plate cylinder engage each other when the plate cylinder is in the printing position, and the drive member of the drive means when the plate cylinder is in the printing position Is connected to the side plate of the plate cylinder, and the driving force is transmitted to the plate cylinder The plate cylinder support device of the stencil printing machine for. 2. A plate cylinder support device for a stencil printing machine according to claim 1 , wherein a ring-shaped flange is fixed to one end of the plate cylinder, and a side plate of the plate cylinder is attached to the flange so as to be movable in the axial direction. .

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