JP2002036695A - Printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of noise caused by the collision of a positioning hole and a positioning pin accompanied by the fluctuations of pressing force at a time when printing pressure is applied to a plate cylinder or released from the plate cylinder, and to set the standby position of a press roll to a position sufficiently close to the plate cylinder. SOLUTION: In a printing apparatus, a plate cylinder unit 67 having the plate cylinder 68 is provided in a freely changeable manner so as to be linearly moved between the mounting position in a housing 60 and the drawing-out position outside the housing 60, the positioning hole 71 is provided to the plate cylinder unit 67, and a positioning pin 70 is provided to the housing 60 to position the plate cylinder. A leaf spring 91 is provided on the unit placing surface 66 of a plate cylinder support part 65 to support he plate cylinder unit 67 at a position other than the mounting position, in such a state that the plate cylinder unit 67 is floated above the unit placing surface 66. The backlash between the positioning hole 71 and the positioning pin 70 is eliminated at the mounting position by the spring force of the leaf spring 91.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus in which a plate cylinder is detachably provided on a housing.

[0002]

2. Description of the Related Art A stencil printing apparatus, which is a kind of printing apparatus,
The heat-sensitive head heat-perforates the stencil sheet corresponding to the desired image, winds the heat-perforated stencil sheet around the outer peripheral surface of the plate cylinder, and presses and conveys the printing paper onto the wound stencil sheet. The image is printed by transferring the ink to the printing paper through the perforation of the stencil sheet. In such a stencil printing apparatus, a plate cylinder is provided detachably with respect to a housing for changing a printing color or the like, and a conventional plate cylinder attaching / detaching mechanism A1 will be described with reference to FIGS. .

In FIGS. 11 to 13, a housing 60 has a front plate 61 and a rear plate 62 arranged at regular intervals, and a plate cylinder take-out opening 63 of the front plate 61 causes a plate cylinder attaching / detaching mechanism A1 to operate. The plate cylinder 68 is attached and detached.

The plate cylinder attaching / detaching mechanism A1 includes a front plate 6
It has a pair of left and right slide rail members 64, 64 which are linear moving means having one end fixed to the vicinity of one plate cylinder take-out port 63 and to the rear plate 62. The pair of slide rail members 64, 64 have a plurality of extendable and contractible rail members, and a plate cylinder support portion 65 is provided at a distal end side of the rail members. The unit support surface 65 is provided with four unit mounting surfaces 66 at four positions corresponding to the four corners of the plate cylinder unit 67. The plate cylinder unit 67 having the plate cylinder 68 is mounted on the unit mounting surface 66. Is held by The plate cylinder unit 67 mounted on the unit mounting surface 66 of the plate cylinder support portion 65 is moved by the slide rail member 64 to the plate cylinder 6.
8 is linearly moved in the axial direction of the center axis of rotation, and is provided so as to be freely movable between a pull-out position outside the housing 60 shown in FIG. 11 and a mounting position inside the housing 60 shown in FIG.

[0005] The plate cylinder unit 67 comprises a plate cylinder 68 and a plate cylinder support frame 69 for supporting the plate cylinder 68.
Is rotatably provided. The outer peripheral wall of the plate cylinder 68 is provided so as to allow ink to pass therethrough, and ink is supplied to the outer peripheral wall from ink supply means (not shown) in the plate cylinder 68.

The plate cylinder attaching / detaching mechanism A1 is provided at a position corresponding to each of the positioning pins 70 provided on the front plate 61 and the rear plate 62 and a plate cylinder support frame 69. And a positioning hole 71. Further, the plate cylinder support frame 69 has a center pin 72 projecting outward at the position of the rotation center axis, and the center pin 72 is provided with a locking groove 73. A center hole 74 into which the center pin 72 is inserted is formed in the rear plate 62.
In the vicinity of the center hole 74, a center pin 7 is provided.
A stopper member 75 locked in the second locking groove 73 is provided to be vertically movable.

On the other hand, a press roll 76 is arranged below the mounting position of the plate cylinder 68 thus detachably provided, and a roll support member 77 of the press roll 76 has a swing support member 78 at its center position. It is supported by the tip of the arm member 79 through the. The press roll 76 is supported by a swing support member 78 so as to be able to swing, so as to uniformly press the outer peripheral surface of the plate cylinder 68. The base end of the arm member 79 is fixed to a rotating rod 80, and the rotating force of a drive source (not shown) is transmitted to one end of the rotating rod 80. In other words, the arm member 79 is rotated by the rotational force of the drive source, so that the press roll 76 separates from the outer peripheral surface of the plate cylinder 68 (positions in FIGS. 11 to 13) and the outer peripheral surface of the plate cylinder 68. It is provided movably between a pressing position to press. Then, at the time of printing, the printing pressure is applied to the printing paper with the press roll 76 as a pressing position at the timing when the printing paper (not shown) passes between the plate cylinder 68 and the press roll 76, and the printing paper is set to the separated position at other timings. Drive controlled.

Next, the operation of replacing the plate cylinder 68 will be described. When the plate cylinder unit 67 located at the mounting position in FIG. 12 is pulled out in the pull-out position direction, the plate cylinder unit 67 is slid by the pair of slide rail members 64 and 64 to the pull-out position in FIG. At this pull-out position, the plate cylinder unit 67 is lifted from the plate cylinder support 65 and removed.

Next, the newly mounted plate cylinder unit 67 is mounted on the unit mounting surface 66 of the plate cylinder support 65 by mounting it. When the plate cylinder unit 67 is pressed in the direction of the mounting position, the plate cylinder unit 67 is slid by the pair of slide rail members 64 to the mounting position in FIG. During this sliding movement, the positioning pin 7 on the housing 60 side is inserted into the positioning hole 71 on the plate cylinder unit 67 side.
By inserting 0, the plate 60 is positioned on the housing 60 at a rotation center position other than the axial direction of the plate cylinder 68. or,
During the slide movement process, the center pin 72 of the plate cylinder unit 67 is inserted into the center hole 74 of the housing 60,
When the stopper member 75 is locked in the locking groove 73 of the center pin 72, it is positioned on the housing 60 in the axial direction of the rotation center axis of the plate cylinder 68.

The height relationship between the positioning holes 71 on the plate cylinder unit 67 placed on the plate cylinder support 65 and the positioning pins 70 on the housing 60 is as shown in FIG. Even when design errors and assembly errors are taken into account, the position is set such that the positioning holes 71 on the plate cylinder unit 67 side are low and the positioning pins 70 on the housing 60 side are high at positions other than the mounting position. Then, as shown in FIG.
In the process of inserting the positioning holes 71 into the positioning pins 70, the plate cylinder unit 67 is lifted upward to perform positioning. That is, at a position other than the mounting position, as shown in FIG. 14A, the height H1 from the unit mounting surface 66 to the lower end of the positioning hole 71 is the height from the unit mounting surface 66 to the lower end of the positioning pin 70. H2 is set lower. This is because, when the positioning holes 71 on the plate cylinder unit 67 side are high and the positioning pins 70 on the housing 60 side are low, the plate cylinder unit 67 needs to be lowered in order for the positioning pins 70 to be inserted into the positioning holes 71. The plate cylinder unit 67 which has to move and is mounted on the unit mounting surface 66
This is because such movement is impossible.

[0011]

However, as shown in FIG. 14A, the positioning hole 71 of the plate cylinder unit 67 is positioned at the position other than the mounting position, as shown in FIG. If the plate cylinder unit 67 is set at a position lower than the pin 70, the upper end surfaces of the positioning holes 71 and the positioning pins 70 slide each time the plate cylinder unit 67 is mounted and pulled out, and the upper end surfaces of the positioning holes 71 and the positioning pins 70 are worn due to long-term use. Due to this wear, a gap is formed between the positioning hole 71 and the positioning pin 70 due to the wear. Then, when the press roll 76 presses the plate cylinder 68 upward during printing, the press force presses the plate cylinder unit 67 upward against its own weight, and the lower end surface of the positioning hole 71 is brought into contact with the lower end surface of the positioning pin 70. When a collision occurs and the press roll 76 releases the pressing on the plate cylinder 68, the plate cylinder unit 67 falls down by its own weight, and the upper end surface of the positioning hole 71 collides with the upper end surface of the positioning pin 70, and the collision occurs. There is a problem that noise sometimes occurs. In addition, a vicious circle occurs in which the wear increases due to the collision and the noise further increases.

As described above, setting the position of the positioning hole 71 on the plate cylinder unit 67 low means that the position of the plate cylinder unit 67 is lower than the casing 60 when the plate cylinder unit 67 slides. The separation position of the press roll 76 must be set to a low position so as not to interfere with the position of the low plate cylinder unit 67. Since the press roll 76 is swingably provided by the swing support member 78, it is necessary to arrange the press roll 76 so as not to interfere with the plate cylinder unit 67 even at the maximum swing position. As described above, there is a problem that the distance between the separated position and the pressed position of the press roll 76 increases, and the speed and size of the press roll driving mechanism of the press roll 76 increase, and the size of the device itself increases accordingly. .

Further, as shown in FIG. 15A, in a configuration in which the positioning is performed by locking the stopper member 75 in the locking groove 73 of the center pin 72, the positioning is always performed even if a design error or the like is taken into consideration. The width of the stopper member 75 is set to be smaller than the width of the stop groove 73. Then, FIG.
As shown in (B), the plate cylinder unit 67 has backlash in the axial direction of the rotation center axis, and is not accurately positioned. If the plate cylinder unit 67 rattles in the axial direction of the rotation center axis, inconveniences such as displacement of the printing position occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a positioning hole and a positioning pin which accompany a change in a pressing force when a printing pressure is applied to or released from a plate cylinder. It is an object of the present invention to provide a printing apparatus that prevents generation of noise due to collision between the printing apparatuses. Also, the present invention
Prevents noise due to collision between positioning holes and positioning pins caused by fluctuations in the pressing force when applying and releasing printing pressure to the plate cylinder, and sufficiently sets the standby position of the press roll for the plate cylinder. An object of the present invention is to provide a printing apparatus which can be located at a position close to a printing cylinder, and eliminates inconvenience caused by the inability to bring the standby position of the press roll close to the plate cylinder. Furthermore,
The present invention prevents the occurrence of noise due to a collision between a positioning hole and a positioning pin due to a variation in a pressing force when applying or releasing a printing pressure to a plate cylinder, and also prevents a rotation center of a plate cylinder unit from rotating. An object of the present invention is to provide a printing apparatus in which the backlash in the axial direction of the shaft is prevented.

[0015]

According to a first aspect of the present invention, a plate cylinder support is provided on a housing via linear moving means, and a plate cylinder unit having a plate cylinder is mounted on the plate cylinder support so as to be freely mounted. Provided,
The plate cylinder unit mounted on the plate cylinder supporter is linearly moved by the linear moving means in the axial direction of the rotation center axis of the plate cylinder to move between the mounting position in the housing and the pull-out position outside the housing. And a positioning hole is provided in one of the plate cylinder unit and the housing, and a positioning pin is provided in the other. The positioning hole is provided in the process of moving the plate cylinder unit from the pull-out position to the mounting position. In a printing apparatus in which the plate cylinder is positioned with respect to the housing at the mounting position by inserting the positioning pin into the unit, the plate cylinder is placed on the unit mounting surface of the plate cylinder support and the unit mounting surface Between the facing surface of the plate cylinder unit,
A first method of causing the plate cylinder unit located at a position other than the mounting position to float above the unit mounting surface by an urging force;
It is characterized in that an urging means is provided.

In this printing apparatus, the positioning hole or the positioning pin on the plate cylinder unit side is set higher than the mounting position, and the positioning pin or the positioning hole on the housing side is set lower. The plate cylinder unit is pressed down against the urging force of the first urging means in the process of inserting the positioning pins into the positioning holes, whereby the plate cylinder unit is positioned at a predetermined position. In the process of pulling out / mounting the plate cylinder unit, the end faces of the positioning holes and the positioning pins slide, and the end faces of the positioning holes and the positioning pins are worn, and a gap is generated between the positioning holes and the positioning pins due to wear. In the mounting position, the plate cylinder unit is positioned in a state of being urged upward by the first urging means, and an upward pressing force is applied to the plate cylinder to apply a printing pressure. It does not occur a collision between the also use the positioning holes and the positioning pins.

According to a second aspect of the present invention, in the printing apparatus according to the first aspect, the first urging means is fixed to a unit mounting surface of the plate cylinder supporting portion.

In this printing apparatus, in addition to the operation of the first aspect, the first urging means may be provided only on the plate cylinder support portion side.

The third aspect of the present invention is the first or second aspect.
The printing apparatus according to claim 1, wherein the first biasing unit is a leaf spring.

In this printing apparatus, claim 1 or claim 2
In addition to the operation of the invention, the plate spring may be arranged so as to urge the plate cylinder unit upward.

According to a fourth aspect of the present invention, there is provided the printing apparatus according to any one of the first to third aspects, wherein a press roll is disposed in the housing and below a mounting position of the plate cylinder. Is separated from the outer peripheral surface of the plate cylinder,
The press roll is provided movably between a pressing position for pressing the outer peripheral surface of the plate cylinder, and the press roll is set to the pressing position in synchronization with a timing at which the printing paper passes between the plate cylinder and the press roll. Thereby, a printing pressure is applied to the printing paper.

In this printing apparatus, in addition to the effects of the first to third aspects of the present invention, the position of the plate cylinder unit relative to the housing side is high except at the mounting position, and the plate cylinder unit is attached and detached during the process of attaching and detaching the plate cylinder unit. It is not necessary to determine the separation position of the press roll in consideration of interference with the press roll.

According to a fifth aspect of the present invention, there is provided the printing apparatus according to any one of the first to fourth aspects, wherein the plate cylinder unit has a center pin that protrudes outward at a position of a rotation center axis and has a locking groove. The housing is provided with a stopper member that is inserted into the locking groove of the center pin at a position where the plate cylinder unit is located at the mounting position, and that controls the axial movement of the plate cylinder unit. And a second urging means for urging the center pin in a pull-out direction.

In this printing apparatus, in addition to the function of the first aspect of the present invention, the second urging means urges the center pin to the pull-out position side so that the inner surface of the locking groove of the center pin and the stopper member come into close contact with each other. ing.

According to a sixth aspect of the present invention, in the printing apparatus according to the fifth aspect, the second biasing means is a leaf spring.

In this printing apparatus, in addition to the function of the fifth aspect of the present invention, a leaf spring may be disposed so as to urge the center pin in the pull-out direction.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 10 show an embodiment of the present invention. This embodiment shows a case where the present invention is applied to a stencil printing apparatus. FIG. 1 is an overall schematic configuration diagram of a stencil printing apparatus, and FIG.
FIG. 3 is a perspective view of a plate cylinder attaching / detaching mechanism, FIG. 3 is a perspective view of a main part thereof, FIG. 4 is a right side view of the plate cylinder attaching / detaching mechanism showing a state where the plate cylinder unit is located at a pulled-out position, and FIG. FIG. 6 is a right side view of the plate cylinder attaching / detaching mechanism showing a state where the plate cylinder is located at the mounting position.
7 is a plan view of the plate cylinder attaching / detaching mechanism in the same state, FIG. 7 is a front view of the mechanism, FIG. 8 is a rear view of the mechanism, and FIG. 9A is a positioning hole when the plate cylinder unit is located at a position other than the mounting position. 9B is a cross-sectional view of a main part showing a height relationship between the plate cylinder unit and the positioning pin, FIG. 9B is a cross-sectional view of the main part showing a height relation when the plate cylinder unit is located at the mounting position, and FIG. FIG. 10 is a sectional view of an essential part showing a state before the pin is inserted into the center hole, FIG.
FIG. 4B is a cross-sectional view of a main part showing a state where the center pin is inserted into the center hole.

In FIG. 1, the stencil printing apparatus mainly comprises a document reading unit 1, a stencil making unit 2, a printing unit 3, a paper feeding unit 4, a paper discharging unit 5, and a stencil discharging unit 6. I have.

The document reading section 1 is disposed on the upper surface of the housing 60 and has a document set table 10 on which a document to be printed is placed.
And reflection type original sensors 11 and 12 for detecting the presence or absence of an original on the original set table 10, original transport rolls 13 and 14 for transporting the original on the original set table 10, and rotating the original transport rolls 13 and 14. Stepper motor 15
A contact image sensor 16 for optically reading image data of a document conveyed by the document conveying rolls 13 and 14 and converting the image data into an electric signal;
And a document discharge tray 17 on which the document discharged from the document tray 0 is placed. Then, the original placed on the original set table 10 is transported by the original transport rolls 13 and 14, and the image sensor 16 reads the image data of the transported original.

The stencil making section 2 includes a stencil containing section 19 for accommodating a rolled long stencil sheet 18 and the stencil containing section 1.
9, a thermal head 20 disposed downstream of the thermal head 20, a platen roll 21 disposed at a position facing the thermal head 20, and a pair of stencil feed rolls 2 disposed downstream of the transport of the platen roll 21 and the thermal head 20.
2, 22 and platen roll 21 and base paper feed roll 2
2 includes a light pulse motor 23 for driving the rotation of the roller 2 and a stencil cutter 24 disposed downstream of the pair of stencil feed rolls 22. Then, the rotation of the platen roll 21 and the base paper feed roll 22 causes the elongate stencil base paper 18 to rotate.
Is conveyed, and each of the point-like heating elements of the thermal head 20 selectively performs a heating operation based on the image data read by the image sensor 16 to thermally perforate the stencil sheet 18 to form a stencil. Is cut by a stencil cutter 24 to produce a stencil sheet 18 having a predetermined length.

The printing unit 3 includes a plate cylinder 68 which rotates in the direction of arrow A in FIG. 1 by the driving force of the main motor 25, and a stencil clamp provided on the outer peripheral surface of the plate cylinder 68 for clamping the leading end of the stencil sheet 18. Part 27 and the detecting piece 28 of the plate cylinder 68
a, a stencil confirmation sensor 28 for detecting whether or not the stencil sheet 18 is wound around the outer peripheral surface of the plate cylinder 68 by detecting a, and a reference piece 29 of the plate cylinder 68 by detecting a detection piece 29 of the plate cylinder 68. It has a reference position detection sensor 30 for detecting a position and a rotary encoder 31 for detecting rotation of the main motor 25. Further, the rotation position of the plate cylinder 68 can be detected by detecting the output pulse of the rotary encoder 31 based on the detection output of the reference position detection sensor 30. The plate cylinder 68 is provided detachably with respect to the housing 60 by a plate cylinder attaching / detaching mechanism A, and the configuration of the plate cylinder attaching / detaching mechanism A will be described later.

The printing unit 3 has a squeegee roll 32 arranged inside the plate cylinder 68 and a doctor roll 33 arranged close to the squeegee roll 32. The ink 34 is stored in the enclosed outer peripheral space. The ink 34 adhering to the outer circumference of the rotating squeegee roll 32 passes through a gap between the squeegee roll 32 and the doctor roll 33, so that only the ink 34 having a predetermined thickness is adhered to the squeegee roll 32. Is supplied to the inner peripheral surface. Further, a press roll 76 is provided at a position facing the squeegee roll 32 and at an outer position below the plate cylinder 68. The press roll 76 is moved between a pressing position where the outer peripheral surface of the plate cylinder 68 is pressed by a press roll driving unit (not shown) using the solenoid device 36 as a driving source, and a separating position where the press roller 76 is separated from the outer peripheral surface of the plate cylinder 68. It is configured to be movable. The configuration of the press roll driving means is the same as that of the above-mentioned conventional example. The press roll 76 is moved from the separated position to the pressed position in synchronization with the paper feeding operation from the paper feeding unit 4, and the printing paper 37 is moved.
Is located at the pressing position only when passing through the lower portion of the plate cylinder 68, and at other times, it is located at the separated position.

Then, the leading end of the stencil sheet 18 conveyed from the stencil making section 2 is clamped by the stencil clamping section 27, and the plate cylinder 68 is rotated in this clamped state, and the stencil sheet 18 is wound around the outer peripheral surface of the stencil sheet 68. The printing paper 37, which is mounted and conveyed from the paper feeding unit 4 in synchronization with the rotation of the printing drum 68, is pressed against the stencil paper 18 of the printing drum 68 by the press roll 76, thereby punching the stencil paper 18 in the printing paper 37. The ink 34 is transferred from the image and the image is printed.

The paper supply unit 4 includes a paper supply table 38 on which print papers 37 are stacked, and a print paper 3 at the uppermost position from the paper supply table 38.
7 and the printing paper 37 conveyed by the primary paper feeding rolls 39 and 40, between the plate cylinder 68 and the press roll 76 in synchronization with the rotation of the plate cylinder 68. A pair of secondary paper feed rolls 41 to be transported
And a paper feed sensor 42 for detecting whether or not the printing paper 37 has been transported between the pair of secondary paper feed rolls 41, 41. The primary paper supply rolls 39 and 40 have a paper supply clutch 4
3, the rotation of the main motor 25 is selectively transmitted.

The paper output unit 5 is a printing paper 37 that has been subjected to a printing process.
Paper separating claw 44 for separating the printing paper 37 from the plate cylinder 68, a transport path 45 through which the printing paper 37 separated from the plate cylinder 68 by the paper separating claw 44 is transported, and a printing paper 37 discharged from the transport path 45. And a paper discharge table 46 on which is mounted.

The stencil discharging unit 6 includes a pair of stencil transport rollers 47, 47 for transporting the used stencil sheet 18 while peeling it off from the plate cylinder 68, and a pair of the stencil transport rollers 47, 4.
7, a plate discharge box 49 for accommodating the stencil sheet 18 conveyed by the pair of plate discharge conveyance rolls 47, 47, and a pair of plate discharge conveyance rolls 4.
A stencil discharge sensor 50 for detecting whether or not the stencil sheet 18 has been conveyed to the stencil discharge box 49 by the stencil sheet 7 and 47.

Next, the structure of the plate cylinder attaching / detaching mechanism A will be described. As shown in FIGS. 2 to 8, the housing 60 has a front plate 61 and a rear plate 62 which are arranged at regular intervals, and is provided by a plate cylinder attaching / detaching mechanism A through a plate cylinder outlet 63 of the front plate 61. The plate cylinder 68 is attached and detached.

The plate cylinder attaching / detaching mechanism A includes a front plate 61
And a pair of left and right slide rail members 64, 64 which are linear moving means having one end fixed to the vicinity of the plate cylinder take-out port 63 and to the rear plate 62. The pair of slide rail members 64, 64 have a plurality of extendable and contractible rail members, and a plate cylinder support portion 65 is provided at a distal end side of the rail members. The plate cylinder support portion 65 is composed of a front support portion 65A and a rear support portion 65B having guide pieces 65a and 65b above, respectively, and a front support portion 65A corresponding to the four corners of the plate cylinder unit 67 and a rear support portion. A unit mounting surface 66 is provided at the portion 65B. The plate cylinder unit 67 is mounted at a predetermined position by being placed on the unit placement surface 66 from above, and can be removed by lifting the placed plate cylinder unit 67. The plate cylinder unit 67 mounted on the unit mounting surface 66 of the plate cylinder support portion 65 is moved by the slide rail member 64 to the plate cylinder 68.
Are linearly moved in the axial direction of the rotation center axis, and are movably provided between a pull-out position outside the housing 60 shown in FIG. 4 and a mounting position inside the housing 60 shown in FIG.

The plate cylinder unit 67 comprises a plate cylinder 68 and a plate cylinder support frame 69 for supporting the plate cylinder 68. The plate cylinder 68 has a pair of disk plates (not shown) provided facing each other at a fixed interval, and a cylindrical flange (not shown) rotatably disposed on the outer peripheral surfaces of the pair of disk plates. The base paper clamp 27 is provided on a part of the outer peripheral surface between the pair of flanges. A cylindrical outer peripheral wall is formed by stretching a flexible screen (not shown) at an outer peripheral portion other than the base paper clamp portion 27, and the screen forming the outer peripheral wall is formed of ink 3.
4.

The plate cylinder supporting frame 69 is provided with the front holding plate 6.
9A, a rear holding plate 69B, and a side holding plate 69C connecting the rear holding plate 69B to each other, and the plate cylinder 68 is disposed in the internal space of these. A fixing pin 90 is fixed between the front holding plate 69A and the rear holding plate 69B. The fixing pin 90 penetrates between a pair of disks (not shown) of the plate cylinder 68 so that the plate cylinder 68 is moved to the plate cylinder support frame. It is supported by the body 69. Also, the plate cylinder support frame 6
9 is provided with a rotation transmitting means (not shown) for transmitting the rotational force from the housing 60 to the plate cylinder 68 and an ink container mounting portion (not shown) for mounting an ink container for supplying ink into the plate cylinder 68. I have.

A front support 65A and a rear support 65B are provided.
A leaf spring 91 serving as a first urging means is arranged on each unit mounting surface 66 of the printer, and the leaf spring 91 is fixed to the plate cylinder supporting portion 65 side. The plate cylinder unit 67 mounted on the unit mounting surface 66 is floated above the unit mounting surface 66 and supported by the spring force of the leaf spring 91. In addition, since the plate cylinder unit 67 is floated by the leaf spring 91, the position of the positioning hole 71 on the plate cylinder unit 67 side is high except for the mounting position, and the positioning pins 70 on the housing 60 side.
Is set so that the position of the mark becomes lower. More specifically, as shown in FIG. 9A, the unit is provided on the unit mounting surface 66 at a height H3 from the upper surface of the leaf spring 91 provided on the unit mounting surface 66 to the lower end of the positioning hole 71. The height H2 from the upper surface of the leaf spring 91 to the lower end of the positioning pin 70 is set lower.

Positioning pins 70 are provided at each of the two positions of the front plate 61 and the rear plate 62. The front holding plate 69A and the rear holding plate 69B of the plate cylinder support frame 69 are provided with positioning pins 70, respectively. Are provided with positioning holes 71 respectively.
The tip of the positioning pin 70 and the end of the positioning hole 71 are formed as tapered surfaces 70a, 71a (shown in FIG. 9). Also, a rear surface holding plate 69B of the plate cylinder supporting frame 69.
And at a position on the extension of the rotation center axis of the plate cylinder 68,
An outwardly protruding center pin 72 is provided, and this center pin 72 is provided with a locking groove 73. A center hole 74 into which the center pin 72 is inserted is provided in the rear plate 62, and a stopper member 75 locked in the locking groove 73 of the center pin 72 is provided near the center hole 74 so as to be vertically movable. Have been. The tip of the center pin 72 and the end of the center hole 74 are also tapered surfaces 72.
a, 74a (shown in FIG. 10).

A leaf spring 92 serving as a second urging means is disposed on the side of the front end of the center pin 72 protruding from the center hole 74 of the rear plate 62. The leaf spring 92 is supported by the rear plate 62. I have. The leaf spring 92 is in a state in which the stopper member 75 is locked in the locking groove 73 of the center pin 72, that is, at the mounting position of the plate cylinder 68, the tip of the center pin 72 is attached to the drawing cylinder side of the plate cylinder 68. Energize.

Next, the operation of replacing the plate cylinder 68 will be described. When the plate cylinder unit 67 located at the mounting position in FIG. 5 or the like is pulled out in the pull-out position direction, the plate cylinder unit 67 slides by the pair of slide rail members 64, 64 and moves to the pull-out position in FIG. At this pull-out position, the plate cylinder unit 67 is lifted from the plate cylinder support 65 and removed.

Next, the newly mounted plate cylinder unit 67 is mounted on the unit mounting surface 66 of the plate cylinder support portion 65 by mounting. The plate cylinder unit 67 is supported at a position above the unit mounting surface 66 by a leaf spring 91.

When the plate cylinder unit 67 is pressed in the direction of the mounting position, the plate cylinder unit 67 is slid by the pair of slide rail members 64 to the mounting position shown in FIG. In this slide movement process, the plate cylinder unit 67
When the positioning pin 70 on the housing 60 side is inserted into the positioning hole 71 on the side, the positioning is performed on the housing 60 in a direction other than the axial direction of the rotation center axis of the plate cylinder 68. Also, during the slide movement process, the center pin 72 on the plate cylinder unit 67 side is used.
Is inserted into the center hole 74 on the housing 60 side, and the stopper member 75 is locked in the locking groove 73 of the center pin 72 to position the housing 60 in the axial direction of the rotation center axis of the plate cylinder 68. Is done.

In the above operation process, the plate cylinder unit 67
At a position other than the mounting position, as shown in FIG.
The plate cylinder unit 67 floats above the unit mounting surface 66 by the spring force of the leaf spring 91, and the positioning pin 70 is inserted into the positioning hole 71.
In the process of inserting the plate cylinder unit 67, the plate cylinder unit 67 is pushed down against the spring force of the leaf spring 91, and the plate cylinder unit 67 is positioned at a predetermined position. Therefore, the plate cylinder unit 6
7, the lower end surfaces of the positioning hole 71 and the positioning pin 70 are slid and the lower end surfaces of the positioning pin 70 are worn out.
A gap is created between the pin and the positioning pin 70 due to wear. However, as shown in FIG. 9B, at the mounting position, the plate cylinder unit 67 is constantly urged upward by the spring force of the leaf spring 91 so that the positioning holes 71 and the positioning pins 70 bring the upper end surfaces of each other into close contact. Even when the press roll 76 moves from the separated position to the pressing position and presses the plate cylinder 68 upward during printing, no collision occurs between the positioning holes 71 and the positioning pins 70, so noise is generated. Does not occur.

In this embodiment, an outer press system is used in which printing pressure is applied from the outside of the plate cylinder 68 by a press roll 76, but an inner press system in which printing pressure is applied from the inside of the plate cylinder 68 by an inner press roll. However, a similar effect can be expected. In other words, in the case of the inner press method, a member receiving the pressing force of the inner press roll, for example, a paper cylinder is arranged outside the plate cylinder 68, so that a reaction force from the paper cylinder upon the press of the inner press roll exerts a force on the plate cylinder 68. Works. Conventionally, noise was generated due to the reaction force. However, in the present invention, since no collision occurs between the positioning hole 71 and the positioning pin 70, the generation of noise can be similarly prevented.

The operation of the center pin 72 in the above operation process will be described. The center pin 72 starts to be inserted into the center hole 74 at a position slightly before the mounting position, and then the center pin 72 protrudes from the center hole 74. The stopper member 75 abuts on the tip of the 72. When further entering from this state, the stopper member 75 is pressed by the tapered surface 72a of the center pin 72 and moves upward, and the center pin 7
2 is allowed to enter, and the leaf spring 92 contacts the tip of the center pin 72. When the center pin 72 is further advanced from this position against the spring force of the leaf spring 92, FIG.
0 (B), as shown in FIG.
Is aligned with the position of the stopper member 75, and the stopper member 75 is inserted into the locking groove 73. Further, the center pin 72 is urged toward the pull-out position side by the spring force of the leaf spring 92, and the inner surface of the locking groove 73 of the center pin 72 and the stopper member 75 come into close contact with each other. The backlash in the axial direction is prevented.

In this embodiment, since the first biasing means (leaf spring 91) is fixed to the unit mounting surface 66 of the plate cylinder support 65, the first biasing means is provided only on the plate cylinder support 65 side. It is not necessary to provide the first urging means in each of the plate cylinder units 67 because it is sufficient to provide them. Note that a first urging unit may be provided for each plate cylinder unit 67.

In this embodiment, since the first urging means is constituted by the leaf spring 91, the leaf spring may be disposed so as to urge the plate cylinder unit 67 upward. Can be easily configured. The first urging means may be any as long as it can lift the plate cylinder unit 67 above the unit mounting surface 66 and can be displaced downward by a force pressing the plate cylinder unit 67 downward.

In this embodiment, in the housing 60,
A press roll 76 is arranged below the mounting position of the plate cylinder 68, and between a separation position where the press roll 76 is separated from the outer peripheral surface of the plate cylinder 68 and a pressing position where the outer peripheral surface of the plate cylinder 68 is pressed. The printing paper 37 is provided movably, and the printing paper 37 is
The printing pressure is applied to the printing paper 37 by setting the press roll 76 to the pressing position in synchronization with the timing of passing between the press roll 8 and the press roll 76. Since the plate cylinder unit 67 is floated by a spring force of the leaf spring 91 at a position other than the mounting position, the plate cylinder unit 6
The position of the press roll 76 is determined in consideration of the fact that the position 7 is relatively high with respect to the housing 60 side and the plate cylinder unit 67 interferes with the press roll 76 in the process of attaching and detaching the plate cylinder unit 67. No need. Therefore, the separation position of the press roll 76 can be arranged sufficiently close to the plate cylinder 68,
The inconvenience caused by the inability to make the separation position of the press roll 76 close to the plate cylinder 68, that is, the problem of increasing the speed and size of the press roll drive mechanism of the press roll 76 and the size of the apparatus itself accompanying this is solved. it can.

In this embodiment, since the second urging means is constituted by the leaf spring 92, the leaf spring may be disposed so as to urge the center pin 72 in the pull-out direction. Can be easily configured. The second urging means may be any as long as it can urge the center pin 72 in the pull-out direction.

In this embodiment, the linear moving means is constituted by the slide rail member 64.
Any means can be used as long as it can linearly move 7 in the axial direction of the rotation center axis of the plate cylinder 68 between the pull-out position outside the housing 60 and the mounting position inside the housing 60.

In this embodiment, the positioning holes 71 are provided on the plate cylinder unit 67 side and the positioning pins 70 are provided on the housing 60 side. Conversely, the positioning pins are provided on the plate cylinder unit 67 side and on the housing 60 side. A positioning hole may be provided. Further, a positioning pin and a positioning hole are provided on the plate cylinder unit 67 side, and a positioning hole is provided at a position on the housing 60 side facing the positioning pin on the plate cylinder unit 67 side, and a housing facing the positioning hole on the plate cylinder unit 67 side. A positioning pin may be provided at a position on the 60 side.

According to the above-described embodiment, the present invention is applied to a stencil printing apparatus. However, the present invention can be applied to a printing apparatus other than a stencil printing apparatus in which the plate cylinder 68 is configured to be detachable.

[0058]

As described above, according to the first aspect of the present invention, in positions other than the mounting position, the positioning holes or positioning pins on the plate cylinder unit side are high and the positioning pins or positioning holes on the housing side are low. When the plate cylinder unit is set from the pull-out position to the mounting position, the plate cylinder unit is pushed down against the urging force of the first urging means in the process of inserting the positioning pin into the positioning hole. When the plate cylinder unit is positioned at a predetermined position, the end faces of the positioning holes and the positioning pins slide in the process of pulling out / mounting the plate cylinder unit, and the end faces of the positioning cylinder and the positioning pins are worn. A gap occurs due to abrasion, but the plate cylinder unit is positioned in a state where the plate cylinder unit is urged upward by the first urging means, and the plate cylinder unit is pressed upward by the plate cylinder to apply printing pressure. Since no collision occurs between the positioning hole and the positioning pin even when a force is applied, the positioning hole and the positioning pin are caused by the fluctuation of the pressing force when applying or releasing the printing pressure to the plate cylinder. It is possible to prevent noise from being generated due to collision between them.

According to the second aspect of the present invention, the first urging means only needs to be provided on the plate cylinder support portion side, and there is no need to provide the first urging means for each of the plate cylinder units.

According to the third aspect of the present invention, since the plate spring as the first urging means may be disposed so as to urge the plate cylinder unit upward, the first urging means can be simply constructed.

According to the fourth aspect of the present invention, the position of the plate cylinder unit relative to the housing is high except at the mounting position, and it is considered that the plate cylinder unit interferes with the press roll in the process of attaching and detaching the plate cylinder unit. Since it is not necessary to determine the separation position of the press roll, the standby position of the press roll can be made sufficiently close to the plate cylinder, and the inconvenience caused by the standby position of the press roll not being able to approach the plate cylinder can be solved.

According to the fifth aspect of the present invention, the second urging means urges the center pin to the pull-out position side and the inner surface of the locking groove of the center pin and the stopper member come into close contact with each other. The backlash in the axial direction of the rotation center shaft is prevented.

According to the sixth aspect of the present invention, since the leaf spring as the second urging means may be disposed so as to urge the center pin in the pulling-out direction, the second urging means can be simply constructed. .

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is an overall schematic configuration diagram of a stencil printing apparatus.

FIG. 2 is a perspective view of the plate cylinder attaching / detaching mechanism according to the embodiment of the present invention.

FIG. 3 is a perspective view of an essential part of a plate cylinder attaching / detaching mechanism according to the embodiment of the present invention.

FIG. 4 is a right side view of the plate cylinder attaching / detaching mechanism according to the embodiment of the present invention, showing a state where the plate cylinder unit is located at a drawn-out position.

FIG. 5 is a right side view of the plate cylinder attaching / detaching mechanism according to the embodiment of the present invention, showing a state where the plate cylinder unit is located at a mounting position.

FIG. 6 is a plan view of the plate cylinder attaching / detaching mechanism according to the embodiment of the present invention, showing a state where the plate cylinder unit is located at a mounting position.

FIG. 7 is a front view of the plate cylinder attaching / detaching mechanism according to the embodiment of the present invention.

FIG. 8 is a rear view of the plate cylinder attaching / detaching mechanism according to the embodiment of the present invention.

9A and 9B show one embodiment of the present invention, in which FIG. 9A is a cross-sectional view of a main part showing a height relationship between a positioning hole and a positioning pin when the plate cylinder unit is located at a position other than the mounting position, and FIG. It is sectional drawing of the principal part which shows the height relationship when a plate cylinder unit is located in a mounting position.

10A and 10B show one embodiment of the present invention, in which FIG. 10A is a cross-sectional view of a main part showing a state before the center pin is inserted into the center hole, and FIG. 10B is a view showing the center pin inserted into the center hole. It is sectional drawing of the principal part which shows a state.

FIG. 11 is a right side view of the plate cylinder attaching / detaching mechanism, showing a conventional example, and showing a state where the plate cylinder unit is located at a drawn-out position.

FIG. 12 is a right side view of the plate cylinder attaching / detaching mechanism, showing a conventional example, showing a state where the plate cylinder unit is located at a mounting position.

FIG. 13 shows a conventional example, and is a front view of a plate cylinder attaching / detaching mechanism.

14A shows a conventional example, in which FIG. 14A is a cross-sectional view of a main part showing a height relationship between a positioning hole and a positioning pin when the plate cylinder unit is located at a position other than the mounting position, and FIG. It is sectional drawing of the principal part which shows the height relationship at the time of being located in a mounting position.

FIG. 15 shows a conventional example, and (A) is a sectional view of a main part showing a state before a center pin is inserted into a center hole,
FIG. 4B is a cross-sectional view of a main part showing a state where the center pin is inserted into the center hole.

[Explanation of symbols]

 A plate cylinder attaching / detaching mechanism 37 printing paper 60 case 61 front plate 62 rear plate 63 plate cylinder outlet 64 slide rail member (linear moving means) 65 plate cylinder support part 67 plate cylinder unit 68 plate cylinder 69 plate cylinder support frame 70 Positioning pin 71 Positioning hole 72 Center pin 73 Lock groove 74 Center hole 75 Stopper member 76 Press roll 91 Leaf spring (first biasing means) 92 Leaf spring (second biasing means)

Claims (6)

[Claims] 1. A plate cylinder support portion is provided on a housing via linear moving means, and a plate cylinder unit having a plate cylinder is provided on the plate cylinder support portion so as to be freely mounted thereon, and is placed on the plate cylinder support portion. The plate cylinder unit is linearly moved by the linear moving means in the axial direction of the rotation center axis of the plate cylinder, and is provided so as to be freely movable between a mounting position in the housing and a pull-out position outside the housing.
A positioning hole is provided in one of the plate cylinder unit and the housing, and a positioning pin is provided in the other, and the positioning pin is inserted into the positioning hole in the process of moving the plate cylinder unit from the pull-out position to the mounting position. The printing cylinder in which the plate cylinder is positioned at the mounting position with respect to the housing, wherein a unit mounting surface of the plate cylinder supporting portion faces the plate cylinder unit mounted on the unit mounting surface. A first urging means provided between said first and second surfaces to lift said plate cylinder unit located at a position other than said mounting position above said unit mounting surface by an urging force. 2. The printing apparatus according to claim 1, wherein said first urging means is fixed to a unit mounting surface of said plate cylinder support. 3. The printing apparatus according to claim 1, wherein the first urging means is a leaf spring. 4. The printing apparatus according to claim 1, wherein a press roll is disposed in the housing and below a position where the plate cylinder is mounted, and the press roll is provided on the plate cylinder. It is movably provided between a separating position separated from the outer peripheral surface and a pressing position pressing the outer peripheral surface of the plate cylinder, and is synchronized with a timing at which the printing paper passes between the plate cylinder and the press roll. A printing pressure acting on the printing paper by setting the press roll to a pressing position. 5. The printing apparatus according to claim 1, wherein the plate cylinder unit projects outward at a position of a rotation center axis,
A center pin having a locking groove is provided, and the plate cylinder unit is inserted into the locking groove of the center pin at a position where the plate cylinder unit is located at the mounting position in the housing, and the plate cylinder unit moves in the axial direction. And a second urging means for urging the center pin in the pull-out direction. 6. The printing apparatus according to claim 5, wherein said second urging means is a leaf spring.