JP4053917B2 - Image exposure device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image exposure apparatus that records an image on a plate.
[0002]
[Prior art]
Conventionally, as an image exposure apparatus for creating a printing plate in which an image is exposed on a plate such as aluminum, the plate is wound around a rotating drum, and the plate is irradiated with a light beam corresponding to image data while rotating the plate together with the rotating drum. In some cases, the plate is irradiated and exposed (for example, see Patent Document 1).
[0003]
The image exposure apparatus conveys a plate obliquely downward on a conveyer, positions the front end of the plate in contact with a pair of first positioning pin rollers, and then positions the front end in the convey direction. Is moved in the width direction orthogonal to the plate conveying direction, and the side portion of the plate is brought into contact with the second positioning pin to perform positioning in the width direction. Thereafter, the plate is inserted into the puncher, and a notch used for positioning when the plate is wound around the rotary drum is formed at the front end of the plate.
[0004]
[Patent Document 1]
Japanese Patent Laying-Open No. 2001-356489 (page 7, FIG. 4)
[0005]
[Problems to be solved by the invention]
The above-described conventional image exposure apparatus performs three-point positioning of a plate with a pair of first positioning pins and a second positioning pin in the width direction, but moves the conveyor to move the plate in the width direction. Therefore, there is a problem that the structure of movement in the width direction becomes large.
[0006]
In addition, a notch for positioning is formed at the tip of the plate by a puncher for positioning to the rotating drum, but the puncher is required to have high durability and high precision, so the equipment becomes expensive There is also.
[0007]
By the way, in an image exposure apparatus provided with a punch device for punching a punch hole that becomes a reference when printing is performed by winding a plate (printing plate) on which an image is exposed around a rotary press, a punching process and winding of a rotating drum An inexpensive and highly accurate plate positioning method is considered by performing the same three-point positioning in the process. However, in this method, since the abutting posture with respect to the three positioning pins is not always constant, securing the abutting reproducibility of the plate becomes a problem.
[0008]
In view of the above circumstances, an object of the present invention is to provide an image exposure apparatus that enables high-precision three-point positioning by an inexpensive method.
[0009]
[Means for Solving the Problems]
The image exposure apparatus of the present invention that achieves the above object is an image exposure apparatus that exposes an image on a plate wound around a rotating drum.
Plate supplying means for supplying the plate toward the rotating drum,
A pair of first positioning pins that abut the front end edge of the plate conveyed by the plate feeding means and regulate the plate front end edge;
A reference pin that abuts against one side edge of the plate that abuts against the pair of first positioning pins and regulates the lateral position of the plate;
The one of the plates in contact with the pair of first positioning pins on the upstream side in the plate supply direction with respect to a straight line passing through the reference pin and parallel to a straight line connecting the first positioning pins. Is provided at a position adjacent to the side edge opposite to the side edge of the plate, and is movable in the plate width direction intersecting the supply direction of the plate and spring-biased in the direction toward the plate, and A pressing pin that presses against the pin, and
The plate is conveyed by the plate feeding means and brought into contact with the pair of first positioning pins, and the pressing pin is pressed against the plate while continuing the conveyance by the plate feeding means, and is separated after being pressed. Thus, a control unit for performing positioning by the pair of first positioning pins and the reference pin is provided.
[0010]
According to the image exposure apparatus of the present invention, two points on the front end edge of the plate conveyed by the plate feed roller are abutted against the pair of first positioning pins to regulate the position of the front end of the plate, and one side of the plate The reference pin abuts on the edge to regulate the lateral position of the plate, and is located upstream of the straight line passing through the reference pin and parallel to the straight line connecting the first positioning pins, in the plate supply direction. The side edge opposite to the pin side edge is pressed with a pressing pin. As a result, a rotational moment is applied to the plate in a direction away from the first positioning pin near the pressing pin with the reference pin as a fulcrum. From this state, when the pressing pin is separated from the side edge of the plate, the plate feed roller is rotated to apply a forward force to the plate, and the component force approaches the reference pin. Three points of the pair of first positioning pins and the reference pin Is accurately positioned.
[0011]
This image exposure apparatus is provided with a punch device for punching holes in a plate, and punching holes are formed in the plate by the punch device, and the plate with punch holes is wound around the rotating drum for exposure. Yes,
The plate feeding means, the reference pin, and the pressing pin are incorporated, and by changing the posture, the plate feeding means supplies the plate to the punch device and the punched plate to the rotating drum. And a pair of second positioning pins that abut the front end edge of the plate supplied toward the punching device by the plate supply guide unit and regulate the front end edge of the plate,
The controller is
When the plate is supplied toward the punching device by the plate supply guide unit, the plate is brought into contact with the pair of second positioning pins, and the pressing pin is moved while the plate supply means is rotated. The plate is pressed against the plate, and after being pressed, the plate is positioned by the pair of second positioning pins and the reference pin, and the plate is punched after positioning,
When the plate is supplied toward the rotary drum by the plate supply guide unit, the plate is brought into contact with the pair of first positioning pins, and the pressing pin is moved while the plate supply means is rotated. It is preferable that the plate is positioned by the pair of first positioning pins and the reference pin by being pressed against the plate and separated after being pressed, and the plate after positioning is wound around the rotating drum.
[0012]
A movable body that is movable in the plate width direction, and is pivotally supported by the movable body so as to be rotatable in parallel with the surface of the plate, and extends upstream from the rotation center toward the plate in the supply direction while approaching the plate. And a rotating arm that is spring-biased in a direction in which the pressing pin approaches the plate, and the pressing pin is movable in the plate width direction. Therefore, it is preferable that it is movable in the plate width direction.
[0013]
It is preferable that the positioning pin, the reference pin, and the pressing pin are rollers supported so as to be rotatable around their respective central axes.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0015]
FIG. 1 is a perspective view of an image exposure apparatus 10 according to an embodiment of the present invention, FIG. 2 is a perspective view of a state where a plate discharge guide is removed, and FIG. 3 is a schematic side view of the image exposure apparatus.
[0016]
As shown in FIGS. 1, 2, and 3, an image exposure apparatus 10 according to the present embodiment has a photosensitive layer on the surface and exposes an image onto a plate 12 made of an aluminum sheet, and includes a conveyance guide. A punch unit 16 is disposed in front of the unit 14, and an exposure unit 18 is disposed below the punch unit 16.
[0017]
The conveyance guide unit 14 includes a plate-feeding guide unit 20 having a substantially rectangular flat plate shape, a plate discharging guide unit 22 having a substantially rectangular flat plate shape disposed above the conveyance guide unit 14, and a left frame 15a and a right frame 15b provided on both sides. is doing.
[0018]
The transport guide unit 14 has a structure that rotates around a fulcrum 17 provided at the rear end of FIGS. 1 to 3 by a predetermined angle. By this rotation, the plate supply guide unit 20 and the plate discharge guide unit 22 are rotated. Can be selectively opposed to the punch portion 16 and the exposure portion 18.
[0019]
As shown in FIG. 2, a cylindrical front plate feeding roller 24 and a rear plate feeding roller 28 are rotatable at the front portion of the plate feeding guide unit 20 and protrude on the plate feeding guide unit 20. Is provided. These plate feeding rollers 24 and 28 are rotated forward and backward by a plate feeding roller drive motor 140 (see FIG. 7) so that the plate 12 placed on the plate feeding guide unit 20 is conveyed forward or backward. It has become. Further, as shown in FIG. 1, a cylindrical plate discharge roller 29 is also provided at the front portion of the plate discharge guide unit 22 so as to be rotatable and protrude on the plate discharge guide unit 22. The plate discharge roller 29 is rotated by a plate discharge roller drive motor 141 (see FIG. 7), so that the plate 12 placed on the plate discharge guide unit 22 is conveyed backward.
[0020]
A large number of trapezoidal columnar ribs 26 are provided on the plate supply guide unit 20. The ribs 26 are arranged in parallel in the front-rear direction, and the protruding height onto the plate supply guide unit 20 is set slightly lower than that of the plate supply roller 24. The ribs 26 reduce the frictional force when the plate 12 is conveyed by the rotation of the plate feeding roller 28.
[0021]
A preset member 30 used for temporary positioning of the plate 12 is provided at the front end of the plate supply guide unit 20. The preset member 30 is advanced and retracted to the front end of the plate 12.
[0022]
When the plate 12 is conveyed forward by the plate feeding rollers 24 and 28, the front end of the plate 12 abuts against the preset member 30. Thereby, temporary positioning of the front end of the plate 12 is performed. When the preset member 30 is retracted downward, the plate 12 can be transported forward beyond the front end of the plate feeding guide unit 20 by the plate feeding roller 24. Thereafter, the main positioning is performed by the second positioning pins 48A and 48B of the punching device 46 as will be described later.
[0023]
As shown in FIG. 2, a slit 32 that is substantially parallel to the plate feeding rollers 24 and 28 is formed in the vicinity of the rear side of the plate feeding roller 24 on the right side of the plate feeding guide unit 20. A reference pin moving unit 37 is arranged below the slit 32 so as to be parallel to the slit 32.
[0024]
FIG. 4 is a perspective view of the reference pin moving unit 37. As shown in the figure, the reference pin moving unit 37 includes a guide member 101 fixed to the frame 100 and a feed screw 102 that is parallel to the guide member 101 and is rotatably attached to the frame 100. The moving body 103 is slidably attached to the guide member 101 and is screwed into the feed screw 102. The reference pin 36 has a roller shape that is rotatably attached to the upper surface of the moving body 103. The feed screw 102 is driven from a drive motor 104 attached to the frame 100 via a timing belt 105, whereby the moving body 103 is reciprocated in the direction of an arrow 106, and the reference pin 36 protrudes from the slit 32 and reciprocates. It is like that.
[0025]
The reference pin 36 is located in advance at the starting position of the right end portion of the plate feeding guide unit 20, that is, the detection position by the upper home position sensor S 1 and the lower home position sensor S 2, and is placed on the plate feeding guide unit 20. The reference pin 36 is moved to the left from the starting position according to the size of the plate 12 so that the reference of the right end portion of the plate 12 is determined.
[0026]
A detection bracket 133 extending substantially horizontally is attached to the moving body 103 of the reference pin moving unit 37. When the detection bracket 133 enters between the light emitting element 130 and the light receiving element 131, the light receiving element 131 is turned on, and the home position of the reference pin 36 is detected as will be described later. The upper home position sensor S1 is a home position when the conveyance guide unit 14 is at the punch position (the chain line position in FIG. 3), and the lower home position sensor S2 is a position where the conveyance guide unit 14 is supplied to the rotary drum 50 (FIG. 3). Each home position at the position of the solid line) is detected.
[0027]
In FIG. 2, a slit 38 that is substantially parallel to the plate supply rollers 24 and 28 is formed on the left side portion of the plate supply guide unit 20, and a width direction moving unit is formed below the slit 38 to be parallel to the slit 38. 39 is arranged.
[0028]
FIG. 5 is a perspective view of the width direction moving unit 39. In the figure, the width direction moving unit 39 includes guide members 112 and 113 fixed between frames 110 and 111 and a moving body 114 movably mounted on the guide members 112 and 113. A rotating arm 115 is attached to the upper part of the movable body 114 so as to be rotatable about a fulcrum 116, and a cylindrical pressing pin 42 is supported on the rotating arm 115 so as to be rotatable about a support shaft 40. . The pressing pin 42 protrudes from the slit 38. The rotating arm 115 is urged by the pressurizing spring 119 counterclockwise in FIG. 5, that is, in the direction in which the pressing pin 42 moves to the right in FIG.
[0029]
A timing belt 120 is stretched between pulleys 117 and 118 provided on the frames 110 and 111, and the moving body 114 is fixed to the timing belt 120. A driving pulley 121 is attached to the shaft of the pulley 117 provided on the frame 111, and a timing belt 123 is stretched between the driving pulley 121 and the motor pulley 122 of the driving motor 122 attached to the frame 110. .
[0030]
As shown in FIGS. 1 and 2, the punch section 16 is configured by a predetermined number (two in the present embodiment) of punch devices 46 provided on a flat support plate 44. As shown in FIG. 2, a pair of second positioning pins 48 </ b> A and 48 </ b> B are provided at the rear portion of each punch device 46.
[0031]
The exposure unit 18 installed at the lower portion of the punching device 46 includes a cylindrical rotating drum 50. As will be described later, when the plate 12 returned from the punch portion 16 onto the plate feeding guide unit 20 is temporarily positioned by the preset member 30 after the punch hole is formed, the transport guide unit 14 is lowered at the front end. The plate feed guide unit 20 is positioned in the tangential direction of the rotary drum 50 and the preset member 30 is lowered from the upper surface of the plate feed guide unit 20. In this state, the plate 12 is conveyed by the plate feed roller 24 so that the front end is positioned on the circumferential surface of the rotary drum 50.
[0032]
As shown in FIG. 3, a pair of first positioning pins 52 </ b> A and 52 </ b> B are provided on the peripheral surface of the rotary drum 50. Further, a front end chuck 54 is provided in the vicinity of the first positioning pins 52 </ b> A and 52 </ b> B on the peripheral surface of the rotary drum 50. A cam 56 is provided above the front end chuck 54, and the rear side of the front end chuck 54 is separated from the circumferential surface of the rotary drum 50 by pressing the front side of the front end chuck 54. As a result, the front end of the plate 12 conveyed from the plate supply guide unit 20 onto the circumferential surface of the rotating drum 50 is inserted between the rear side of the front end chuck 54 and the circumferential surface of the rotating drum 50 as described above. The main positioning of the plate 12 is performed.
[0033]
After the main positioning of the plate 12 is completed, the cam 56 is rotated to release the pressing of the front end chuck 54, and the rear side of the front end chuck 54 is rotated by a spring (not shown) provided in the front end chuck 54. Thereby, the front end of the plate 12 is pressed and the front end of the plate 12 is held on the circumferential surface of the rotary drum 50. Further, when the front end of the plate 12 is held on the peripheral surface of the rotary drum 50, the rotary drum 50 is rotated forward (in the direction of arrow A) in the plate supply direction, and the plate 12 is wound around the peripheral surface of the rotary drum 50. .
[0034]
In the vicinity of the peripheral surface of the rotating drum 50, a squeeze roller 58 that can be brought into contact with and separated from the rotating drum 50 is disposed in front of the cam 56. When the squeeze roller 58 is moved toward the rotating drum 50, the squeeze roller 58 is rotated while pressing the plate 12 wound around the rotating drum 50 toward the rotating drum 50, thereby bringing the plate 12 into close contact with the peripheral surface of the rotating drum 50.
[0035]
Further, a rear end chuck attaching / detaching unit 60 is disposed in the vicinity of the peripheral surface of the rotating drum 50 on the rear side (in the direction of arrow B) from the mounting cam 56. The rear end chuck attaching / detaching unit 60 includes a shaft 62 movable toward the rotary drum 50 and a rear end chuck 64 attached to the front end of the shaft 62, and the rear end of the plate 12 wound around the rotary drum 50. Is opposed to the rear end chuck attaching / detaching unit 60, the rear end chuck 64 is moved to the rotating drum 50 side via the shaft 62 to fix the plate 12 at a predetermined position of the rotating drum 50, and at the same time from the shaft 62 to the rear end chuck. 64 is withdrawn. Thereby, the rear end chuck 64 presses the rear end of the plate 12, and the rear end of the plate 12 is held on the circumferential surface of the rotary drum 50.
[0036]
As described above, when the front end and the rear end of the plate 12 are held by the rotary drum 50 by the front end chuck 54 and the rear end chuck 64, the rotary drum 50 is rotated at a predetermined rotation after the squeeze roller 58 is separated from the rotary drum 50. It is rotated at high speed. As a result, the plate 12 is wound around the rotary drum 50 while being conveyed on the plate feed guide unit 20.
[0037]
As shown in FIGS. 3 and 6, a recording head portion 66 as an image recording portion is disposed in the vicinity of the rear side of the circumferential surface of the rotary drum 50. As shown in FIG. 6, a female screw 68 is formed in the recording head portion 66. Furthermore, a feed screw 70 is disposed in the vicinity of the rear side of the circumferential surface of the rotary drum 50 in parallel with the direction of the shaft 50A of the rotary drum 50, and at one end (right end in the present embodiment) of the feed screw 70. A pulse motor (stepping motor) 72 is connected, and the feed screw 7 is rotated by driving the pulse motor 72. A female screw 68 of the recording head portion 66 is screwed onto the feed screw 70 and supported. When the feed screw 70 is rotated by the pulse motor 72, the recording head unit 66 moves in the axial direction of the rotary drum 50.
[0038]
The recording head portion 66 is provided with an origin position detection sensor 76, and the origin position detection sensor 76 detects the origin mark 78 arranged at a predetermined position near the rotary drum 50, whereby the recording head portion 66 is located at the origin position. (Head home position).
[0039]
Here, the recording head unit 66 is directed to the rotating drum 50 rotated at a high speed as described above, and the light beam modulated based on the read image data from the irradiation lens 80 in synchronization with the rotation of the rotating drum 50. Irradiation, thereby exposing the plate 12 based on the image data. This exposure process is so-called scanning exposure in which the recording head 66 is moved in the axial direction of the rotating drum 50 (sub-scanning) while rotating the rotating drum 50 at high speed (main scanning).
[0040]
When the scanning exposure to the plate 12 is completed, the rotary drum 50 is temporarily stopped at a position where the rear end chuck 64 faces the shaft 62, and the rear end chuck 64 is removed from the rotary drum 50 by the backward movement of the shaft 62. The pressing of the rear end of the plate 12 by the end chuck 64 is released. Further, after the conveying guide unit 14 is rotated and the discharge plate guide unit 22 is opposed to the tangential direction of the rotating drum 50 as shown by the solid line in FIG. 3, the rotating drum 50 is rotated in the direction of arrow B in FIG. As a result, the plate 12 is discharged from the rear end side to the plate discharge guide unit 22. At this time, the cam 56 is rotated to press the front side of the front end chuck 54, so that the front end of the plate 12 is released from the rear side of the front end chuck 54.
[0041]
When the plate 12 is sent to the plate discharge guide unit 22, the plate discharge roller 29 is rotated and the plate 12 is discharged from the plate discharge guide unit 22, whereby the plate 12 is adjacent to the image exposure apparatus 10 and the next developing device. Or it is conveyed to a printing apparatus (illustration omitted).
[0042]
FIG. 7 is a circuit configuration diagram for controlling the positioning of the plate 12. The controller 60 includes a drive circuit 104 a for the drive motor 104 for the reference pin 36, a drive circuit 122 a for the drive motor 122 for the pressing pin 42, and a plate feed. The drive circuit 140a of the drive motor 140 of the rollers 24 and 28 and the drive circuit 141a of the drive motor 141 of the discharge roller 29 are connected to each other.
[0043]
8 and 9 are explanatory views of plate positioning operation by the image exposure apparatus of the present invention. Hereinafter, the plate positioning operation will be described with reference to FIGS. 3, 7, 8, and 9.
[0044]
In the initial state, the transport guide unit 14 is raised to the chain line position in FIG. 3 (initial state). First, after inputting size information such as the length, width, and thickness of the plate 12 to a control means (not shown), the plate 12 is placed on the plate feeding guide unit 20. At this time, so-called manual feeding may be used, or feeding by an automatic sheet feeding device or the like may be used. The plate 12 on the plate supply guide unit 20 is placed in a relatively rough state.
[0045]
In this state, the plate 12 is conveyed forward by the plate feeding rollers 24 and 28, and the front end of the plate 12 is abutted against the preset member 30. At this time, the plate feeding rollers 24 and 28 rotate and slip with the plate 12.
[0046]
In this state, the reference pin 36 moves by the amount of movement calculated from the width size information of the plate 12 based on the signal from the control unit 60 shown in FIG. That is, the drive motor 104 of the reference pin moving unit 37 shown in FIG. 4 is driven by the signal of the plate width size information, and the reference pin 36 and the detection bracket 133 are moved via the timing belt 105, the feed screw 102, and the moving body 103. The light receiving element 131 is turned on after entering between the light emitting element 130 and the light receiving element 131 of the upper home position sensor S1. The drive motor 104 is reversed by the signal that the light receiving element 131 is turned on, and the detection bracket 133 is separated from the light emitting element 130 and the light receiving element 131 of the upper home position sensor S1. The position at the moment when the detection bracket 133 moves away from between the light emitting element 130 and the light receiving element 131 of the upper home position sensor S1 is set as the starting position (home position) of the reference pin 36.
[0047]
Next, the drive motor 122 of the width direction moving unit 39 shown in FIG. 5 is driven, the pressing pin 42 moves via the moving body 114 to push the side edge of the plate 12, and the side edge on the opposite side of the plate 12 is used as a reference. The plate 12 is temporarily positioned by abutting against the pins 36. After the temporary positioning, the pressing pin 42 is retracted away from the plate. In this temporary positioning state, the plate supply guide unit 20 of the transport guide unit 14 is opposed to the punch portion 16 (chain line position in FIG. 3).
[0048]
When the preset member 30 is lowered from the upper surface of the plate feeding guide unit 20, the plate 12 is conveyed forward by the plate feeding rollers 24 and 28, and the front end of the plate 12 is moved to the pair of second positioning pins 48A and 48B of the punch portion 16. It is hit. At this time, the plate feeding rollers 24 and 28 rotate and slip with the plate 12. Next, the pressing pin 42 is pressed against the plate, and the plate 12 is conveyed rightward and abutted against the reference pin 36. Thereafter, the pressing pin 42 is separated from the plate 12, so that the plate 12 is brought into the plate feed guide at the punch portion 16. The main positioning is performed with the unit 20 mounted. As a result, the plate 12 is fully positioned at the three points of the pair of second positioning pins 48 </ b> A and 48 </ b> B and the reference pin 36. In this state, punch holes are made in the plate 12 by the punch device 46.
[0049]
Next, after the conveyance guide unit 14 is moved to a position opposite to the tangential direction of the rotary drum 50 and temporarily positioned by the preset member 30 as described above, the plate 12 is conveyed forward by the plate feeding rollers 24 and 28, The 12 front ends are abutted against the pair of first positioning pins 52 </ b> A and 52 </ b> B of the rotary drum 50. At this time, the plate feeding rollers 24 and 28 rotate and slip with the plate 12. Next, the pressing pin 42 is pressed against the plate, the plate 12 is conveyed rightward and is abutted against the reference pin 36, and then the pressing pin 42 is separated from the plate 12. The main positioning is performed with the unit 20 mounted. As a result, the plate 12 is fully positioned at the three points of the pair of first positioning pins 52A and 52B and the reference pin 36. In this state, the plate 12 is wound around the rotary drum 50 as described above.
[0050]
FIG. 8 is a plan view showing the arrangement of the pressing pins. As shown in FIG. 8, in the present invention, the contact position of the pressing pin 42 with respect to the plate 12 is defined as follows. That is, the pressing pin 42 passes through the reference pin 36 and is opposite to the second positioning pins 48A and 48B with respect to the straight line L2 parallel to the straight line L1 connecting the second positioning pins 48A and 48B, that is, the plate. Located on the upstream side in the supply direction, the reference pin 36 is configured to contact the side edge 12b opposite to the side edge 12a. Thus, the straight line L3 connecting the contact point P of the pressing pin 42 and the reference pin 36 and the straight line L2 have a predetermined angle α.
[0051]
With this configuration, when the side portion 12b of the plate 12 is pressed by the pressing pin 42, a rotational moment M is applied to the plate 12 with the reference pin 36 as a fulcrum, as shown in FIG.
[0052]
FIGS. 9A and 9B show a state where the plate 12 is rotated by the rotational moment M. FIG. By the pressing of the pressing pin 42, the plate 12 is separated from the second positioning pin 48A on the left side as shown in FIG. An angle formed by the straight line L1 and the front edge of the plate 12 at this time is defined as θ.
[0053]
In this state, as shown in FIG. 9B, when the pressing pin 42 is separated from the plate 12, the force of the component force Fr · sinθ of the force Fr in the rotation direction of the plate feeding rollers 24 and 28 is applied to the plate 12. Since this force is directed in the direction of the reference pin 36, the plate 12 approaches the reference pin 36 and the side edge 12a contacts the reference pin 36. In this state, the plate 12 rotates in the direction of the arrow A, and finally, FIG. As shown in FIG. 8, the front end edge comes into contact with the second positioning pins 48 </ b> A and 48 </ b> B, and the other side edge 12 b comes into contact with the reference pin 36, thereby performing three-point positioning.
[0054]
8 and 9, only the second positioning pins 48A and 48B are shown, but the first positioning pins 52A and 52B have the same relative positional relationship with respect to the second positioning pins 48A and 48B and the plate 12. Therefore, the above description is applied to the first positioning pins 52A and 52B as they are.
[0055]
FIG. 10A shows an example of a configuration in which the pressing pin 42 is positioned downstream of the straight line L2 in the plate supply direction for comparison.
[0056]
In this configuration, the pressing of the pressing pin 42 causes the plate 12 to move away from the left second positioning pin 48B as shown in FIG. An angle formed by the straight line L1 and the front edge of the plate 12 at this time is defined as θ.
[0057]
In this state, when the pressing pin 42 is separated from the plate 12 as indicated by a chain line, the force of the Fr component force Fr · sinθ, which is the force in the rotational direction of the plate feeding rollers 24 and 28, is applied to the plate 12 and this force is applied. Since the plate 12 faces away from the reference pin 36, the plate 12 moves away from the reference pin 36. As shown in FIG. 10C, the other side edge 12b is separated from the reference pin 36, and the three-point positioning is not established.
[0058]
FIG. 11 is an explanatory diagram of the operation of the pressing pin when the width direction moving unit 39 shown in FIG. 5 is used in which the rotating arm 115 is attached to the upper part of the moving body 114 so as to be rotatable about the fulcrum 116.
[0059]
The pressing pin 42 contacts the side edge 12b of the plate 12, and as the pressing pin 42 is pressed by the side edge 12b, the pressing pin 42 moves in the upstream direction of the plate 12 supply by a distance t. As a result, the rotational moment M in the direction of the arrow is easily applied to the plate 12, and the plate is reliably separated from the second positioning pin 48A on the left side (the same applies to the first positioning pin 52A). However, since the rotational moment can be increased as the position where the pressing pin 42 is moved away from the straight line L2, the pressing pin 42 may simply be moved linearly in the plate direction.
[0060]
【The invention's effect】
As described above, according to the image exposure apparatus of the present invention, the plate is rotated about the reference pin as a fulcrum and once separated from the positioning pin on the pressing pin side. Since it abuts on the pin, the plate side edge is not separated from the reference pin, and the plate is accurately positioned at the three points of the reference pin and the pair of positioning pins, thereby enabling highly accurate plate positioning with an inexpensive configuration.
[Brief description of the drawings]
FIG. 1 is a perspective view of an image exposure apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view of the image exposure apparatus according to the present invention in a state where a discharge guide unit is removed.
FIG. 3 is a schematic side view schematically showing an image exposure apparatus of the present invention.
FIG. 4 is a perspective view of a reference pin moving unit.
FIG. 5 is a perspective view of a width direction moving unit.
FIG. 6 is a plan view schematically showing an image exposure apparatus of the present invention.
FIG. 7 is a control circuit diagram of positioning control of the image exposure apparatus of the present invention.
FIG. 8 is a plan view showing the arrangement of pressing pins in the image exposure apparatus of the present invention.
FIG. 9 is an explanatory view of plate positioning operation.
FIG. 10 is a plan view showing a comparative example of the arrangement of pressing pins and plate positioning.
FIG. 11 is an operation explanatory view showing another example of the structure of the pressing pin.
[Explanation of symbols]
10 Image exposure equipment
12 plates
14 Transport guide unit
20 Feeding guide unit
22 Displacement guide unit
24, 28 Plate roller
36 Reference pin
37 Reference pin moving unit
39 Width direction moving unit
42 Pressing pin
46 Punch device
48A, 48B Second positioning pin
50 Rotating drum
52A, 52B first positioning pin
60 Control unit
104 Reference pin drive motor
122 Pressing pin drive motor
140 Plate Feeding Roller Drive Motor
141 Discharge roller driving motor
L1, L2 straight line

Claims (4)

In an image exposure apparatus that exposes an image on a plate wound around a rotating drum,
Plate supplying means for supplying the plate toward the rotating drum,
A pair of first positioning pins that abut the front end edge of the plate conveyed by the plate feeding means and regulate the plate front end edge;
A reference pin that abuts against one side edge of the plate that abuts against the pair of first positioning pins and regulates the lateral position of the plate;
The one of the plates in contact with the pair of first positioning pins on the upstream side in the plate supply direction with respect to a straight line passing through the reference pin and parallel to a straight line connecting the first positioning pins. Is provided at a position adjacent to the side edge opposite to the side edge of the plate, and is movable in the plate width direction intersecting the supply direction of the plate and spring-biased in the direction toward the plate, and A pressing pin that presses against the pin, and the plate feeding means conveys the plate to abut against the pair of first positioning pins, and the pressing pin is moved to the plate while continuing to be conveyed by the plate feeding means. And a control unit that performs positioning by the pair of first positioning pins and the reference pins by separating them after pressing against each other. Image exposure apparatus. This image exposure apparatus is provided with a punch device for punching holes in a plate, and punching holes are formed in the plate by the punch device, and the plate with punch holes is wound around the rotating drum for exposure. Yes,
The plate feeding means, the reference pin, and the pressing pin are incorporated, and by changing the posture, the plate feeding means supplies the plate to the punch device and the punched plate to the rotating drum. And a pair of second positioning pins that abut the front end edge of the plate supplied toward the punching device by the plate supply guide unit and regulate the front end edge of the plate,
The controller is
When the plate is supplied toward the punching device by the plate supply guide unit, the plate is brought into contact with the pair of second positioning pins, and the pressing pin is moved while the plate supply means is rotated. The plate is pressed against the plate, and after being pressed, the plate is positioned by the pair of second positioning pins and the reference pin, and the plate is punched after positioning,
When the plate is supplied toward the rotary drum by the plate supply guide unit, the plate is brought into contact with the pair of first positioning pins, and the pressing pin is moved while the plate supply means is rotated. The plate is positioned by the pair of first positioning pins and the reference pin by being pressed against the plate and separated after being pressed, and the plate after positioning is wound around a rotating drum. The image exposure apparatus according to 1. A movable body that is movable in the plate width direction, and is pivotally supported by the movable body so as to be rotatable in parallel with the surface of the plate. And a rotating arm that is spring-biased in a direction in which the pressing pin approaches the plate, and the pressing pin is movable in the plate width direction. The image exposure apparatus according to claim 1, wherein the image exposure apparatus is movable in the plate width direction. 2. The image exposure apparatus according to claim 1, wherein the positioning pin, the reference pin, and the pressing pin are rollers supported so as to be rotatable about respective central axes.

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