JP4347729B2 - Sheet-like object inspection device for double-sided printing machines - Google Patents

Description

  The present invention, for example, in a sheet-fed rotary printing machine or printer, is used for inspecting the printing surface of a sheet-like material conveyed while being attached to a nail and being in contact with the circumferential surface of a cylinder. It relates to the device.

  The printing paper supplied from the paper feeder to the printing unit in the sheet-fed rotary printing machine is printed by the printing cylinder, then conveyed by the paper discharge chain, and discharged and stacked on the paper stack of the paper discharge device. In such a printing operation, misregistration, oil stains, and the like may occur due to various causes. Therefore, it is necessary to remove the illegal paper so that it is not mixed with normal paper and shipped. Therefore, after printing, the pixels from the beginning to the end of each printing paper heading to the paper discharge device are detected by a camera or sensor, and the difference between the density value and the density value of each pixel of the standard image is determined. There is widely known a sheet-like object inspection apparatus in which illegal paper is discharged onto another paper receiving tray, or a label is attached to the illegal paper and the paper is removed after loading. In this sheet-like material inspection device, the sheet-like material is stabilized by preventing the sheet-like material from flapping during the inspection or by tensioning the sheet-like material so that the inspection can be performed accurately. A device is provided for transporting in the state.

The conventional sheet inspection apparatus includes a first detection unit that detects a printing state of the surface of the paper conveyed by the first transfer cylinder, and a printing state of the back surface of the paper conveyed by the second transfer cylinder. Second detecting means for detecting, and a plurality of suction holes are provided on the surfaces of the first and second transfer cylinders, and paper is transferred by these suction holes to the surfaces of the first and second transfer cylinders. It is detected by the first and second detection means in a state where the flapping of the paper is regulated and the paper fluttering is regulated (see, for example, Patent Document 1). In addition, the end of the paper bottom side with the leading end held by the nail of the transfer drum is adsorbed by a paper bottom adsorption device provided on the transfer drum, and the paper drum adsorption device is moved in a direction away from the nail, thereby transferring the transfer drum. In some cases, the paper is being detected by a detector in a state where the paper being conveyed is in tension (see, for example, Patent Document 2). In addition, the applicant could not find any prior art documents closely related to the present invention by the time of filing other than the prior art documents specified by the prior art document information described in the present specification. .
JP 2001-287344 A (paragraphs “0022” and “0030”, FIGS. 1 and 2) Japanese Utility Model Publication No. 6-21718 (page 4, left column, lines 1 to 16, lines 2 and 4)

  In the former apparatus of the conventional sheet-like material inspection apparatus described above, the paper fluttering is regulated by the paper being adsorbed on the surface of the transfer cylinder, but the paper is sucked into a number of suction holes in a state where the paper is not tensed. As a result, irregularities are formed on the surface of the paper, and the paper becomes wavy, which causes a problem that accurate inspection cannot be performed. In addition, the latter device can tension the paper and closely adhere to the peripheral surface of the inspection cylinder, but only inspects one side of the paper, and conveys the paper from the paper supply device to the paper discharge device. It is not possible to inspect both sides of the paper by performing only one so-called paper threading.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to make it possible to accurately inspect both sides of a sheet-like material by one paper threading and to change the size of the sheet-like material. It is intended to make the adjustment work accompanying the adjustment easy and in a short time.

  In order to achieve this object, the invention according to claim 1 is directed to a first conveying cylinder provided with a first tip holding means for holding the leading edge of a sheet-like material, and a driving connection with the first conveying cylinder. A second conveying cylinder provided on the downstream side of the first conveying cylinder in the sheet conveying direction and having a second tip holding means for holding the leading edge of the sheet, and the first conveying First inspection means for inspecting one surface of the sheet-like material conveyed by the cylinder, and second inspection means for inspecting the other surface of the sheet-like material conveyed by the second conveyance cylinder. In the sheet-like object inspection apparatus of the double-sided printing machine, the sheet-like material supported by the first conveying cylinder so as to be movable in the circumferential direction of the first conveying cylinder and held by the first tip holding means. A first rear end holding means for holding the rear end of the object, and the second transfer to the second transfer cylinder. Second rear end holding means for supporting the rear end of the sheet-like material held by the second front end holding means, and supported on the frame side. A first engagement means that engages with one rear end holding means side; and a second engagement means that is supported on the frame side and engages with the second rear end holding means side, During the rotation of the first transport cylinder to a predetermined reference position, the first rear end portion holding means and the second rear end portion holding means are the first engagement means and the second Each of the engaging means, and the position of the first tip holding means relative to the first rear end holding means and the second tip holding by the further rotation of the first transport cylinder The position of the means relative to the second rear end holding means changes, and the first transport cylinder is positioned at the reference position. By attaching, the circumferential length between the first front end holding means and the first rear end holding means in the anti-sheet-like material transport direction, and the second front end holding means The first engagement means and the second engagement means are arranged so that the circumferential length between the second rear end holding means and the second sheet holding member in the anti-sheet-like material conveying direction is the same. It is a thing.

  According to a second aspect of the present invention, in the first aspect of the present invention, the rotation direction of the first conveying cylinder to the reference position is an anti-sheet-like object conveying direction, and the anti-sheet-like object is conveyed from the first tip end holding means. The circumferential length between the first rear end holding means in the sheet conveyance direction is set to be equal to or less than the length in the vertical direction of the minimum size sheet material.

  The invention according to claim 3 is the invention according to claim 1, wherein the first engagement means and the second engagement means are the first rear end holding means side and the second rear end holding. Engaging the first engagement pin and the second engagement pin fixed to each of the means sides, and connecting the first rear end holding means and the second rear end holding means to the first engagement pin. Locking means for disabling movement with respect to each of the combining means and the second engaging means is provided.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the first aspect of the invention includes a driving unit that rotates the first conveying cylinder and a control unit that controls the driving unit, and the control unit includes the first conveying cylinder. The drive means is controlled to rotate the conveying cylinder to the reference position in one direction and then to the position corresponding to the size of the sheet-like material in the direction opposite to the one direction, and the first and second The rear end holding means is positioned at a position for holding the rear end of the sheet-like material held by the first and second tip holding means.

  According to the present invention, both sides of a sheet-like object can be inspected with a single paper thread, the inspection of both sides can be performed accurately, and the adjustment operation of the rear end holding means accompanying the size change of the sheet-like object Can be carried out easily and in a short time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a side view showing a part of a double-sided printing machine employing a sheet-like object inspection apparatus according to the present invention, FIG. 2 is a plan view of the same surface inspection cylinder, FIG. Is a sectional view taken along line VV in FIG. 2, FIG. 6 is a detailed side view of the bottom side suction head viewed from the same direction as FIG. 3, and FIG. FIG. 8 is a block diagram showing the configuration, FIG. 9 is a flowchart, FIG. 10 is a side view of the main part showing the state where the surface inspection cylinder is rotated to the reference position, and FIG. It is a side view of the principal part which shows the state rotated so that it might respond | correspond to the sheet-like material. In these drawings, an arrow A indicating the rotation direction of the front surface inspection cylinder 23 and the back surface inspection cylinder 24 indicates a direction in which the paper is conveyed by each inspection cylinder 23, 24, and an arrow B indicates the paper by each inspection cylinder 23, 24. This indicates the direction opposite to the direction of conveyance (hereinafter referred to as the anti-paper conveyance direction), and the rotation directions indicated by arrows A and B in the inspection cylinders 23 and 24 differ depending on the inspection cylinders 23 and 24.

  A double-sided printing machine denoted by reference numeral 1 in FIG. 1 has a paper feeding device (not shown) and a plurality of printing units 2 for printing both sides of paper fed one by one from the paper feeding device (only one is shown). And a paper discharge device 3 that discharges and stacks printed paper on a paper stack (not shown). Each printing unit 2 includes a plate cylinder 10, a rubber cylinder 11, and an impression cylinder 12 that are in contact with each other. Between the impression cylinders 12 of adjacent printing units 2, a transfer cylinder 13 contacts each other's peripheral surface. Are arranged.

  The paper discharge device 3 includes a pair of left and right sprockets 15 that are coaxially mounted on the paper discharge cylinder, and a pair of left and right sprockets (not shown) disposed at the front end of the sprocket 15 and the paper discharge frame 16. And a pair of left and right paper discharge chains 17 stretched between them.

  Between the most downstream printing unit 2 and the paper discharge device 3, there is provided a paper inspection device generally indicated by reference numeral 20, and this paper inspection device 20 has a frame 21 and a paper discharge frame 16 of the printing unit 2. And left and right frames 22 and 22 are connected. A surface inspection cylinder 23 as a first conveyance cylinder and a back inspection cylinder 24 as a second conveyance cylinder are pivotally supported on the frame 22 with their peripheral surfaces in contact with each other. A transfer cylinder 25 is provided between the surface inspection cylinder 23 and the impression cylinder 12 of the printing unit 2 so that the circumferential surfaces of the cylinders 23 and 12 are in contact with each other. A transfer cylinder 26 is provided between the discharge cylinder and a peripheral surface of both cylinders.

  A surface inspection camera 28 as a first inspection means for inspecting the surface of the paper transported by the surface inspection cylinder 23 is provided obliquely above the surface inspection cylinder 23, and is provided on the side of the back inspection cylinder 24. Is provided with a back surface inspection camera 29 as a second inspection means for inspecting the back surface of the paper conveyed by the back surface inspection cylinder 24.

  Next, the claws and suction heads provided on the front surface inspection cylinder 23 and the back surface inspection cylinder 24 will be described with reference to FIGS. Since the back surface inspection cylinder 24 has the same configuration as the surface inspection surface 23, only the surface inspection surface 23 will be described here, and the back surface inspection surface 24 will be described as necessary.

As shown in FIG. 2, the surface inspection cylinder 23 is formed by a cylinder main body 30 and end shafts 31 and 32 fixed to both end portions thereof. 34 is fitted in contact with the side surface of the trunk body 30, and the side plates 33 and 34 are supported so as to be movable in the circumferential direction with respect to the trunk body 30.
These side plates 33 and 34 are fixed to the barrel body 30 with bolts or the like during operation, and the fixing is released when adjustment work accompanying a change in paper size described later is performed. Further, the side plates 33 and 34 and the body main body 30 can be fixed and released by the actuator without using a tool.
Cutouts 35, 35 are provided over the entire length of the trunk at positions where the outer peripheral portion of the trunk body 30 is equally divided in the circumferential direction, and each notch 35 has a gripping claw device (hereinafter simply referred to as a claw) 36A, 36B. Are arranged in parallel in the trunk axis direction. Each of the claws 36A and 36B is formed by the cooperation of the well-known cam follower 37 shown in FIG. 4 and the opening / closing cam 38 fixed to the frame 22 side according to the rotation of the surface inspection cylinder 23. 23 is opened and closed so as to replace the paper from the nail of the transfer drum 25 at the contact point with 23.

  In this way, at the end of the paper bottom side of the paper that is transported with the leading ends being held by the claws 36A, 36B, a paper bottom suction device (one paper bottom suction device 40B is not shown) is shown as a whole by reference numerals 40A, 40B. Z). That is, circular bearings 41 and 42 are bolted to the outer surfaces of the left and right side plates 33 and 34, respectively, and an intake pipe 43 is rotatably supported between the bearings 41 and 42. . In addition, another intake pipe 45 is fixed and pivoted between the shaft hole of the side plate 33 and the bearing plate 44 fixed to the other side plate 34. As shown in FIGS. 2 and 6, both intake pipes 43, 45 are connected by a connecting plate 46 at the center in the trunk axis direction, and are connected via a communication hole 46 a provided in the connecting plate 46. .

  A plurality of suction heads 47A (47B) are split and fixed in parallel in the axial direction to one intake pipe 43, and a guide 48a fixed to the suction port 48 and the intake pipe 45 at the tip thereof is a cylinder. A plurality of long grooves 49 extending in the circumferential direction provided in parallel on the peripheral surface in the axial direction are engaged with the side plates 33 and 34 so as to be movable in the circumferential direction. The suction hole 50 provided in the suction port 48 is opened in the body circumferential surface, and the suction hole 50 and the inner hole of the suction pipe 43 are communicated by an air passage 51. 52 is a valve for adjusting the air passage 51.

  On the other hand, an annular valve ring 54 is supported on the side plate 33 by a short air tube 56 protruding into the pair of circular holes 55 from the side plate 33 side so as to be able to slightly advance and retreat in the body axis direction. An air passage 57 communicates with the inner hole of the intake pipe 45. 58 is a compression coil spring for projecting the valve ring 54 interposed between the side plate 33 and the valve ring 54. The air passage 57 is provided in a connection fitting 59 that is fitted at one end to the intake pipe 45 and fixed to the back side of the side plate 33.

  With this configuration, when the surface inspection cylinder 23 rotates while suction air is applied to the rotary valve and the valve ring 53 is in pressure contact with the rotary valve, the long hole of the rotary valve and the short air pipe 56 are formed. Only when communicating opposite to each other, during the paper holding and feeding by the claws 36A and 36B, air is sucked from the air intake holes 50 through the air passages 57, 46a and 51, and the end on the paper bottom side. Adhere the part to the waist surface.

  Further, the bottom side suction devices 40A and 40B are provided with a mechanism for pulling the paper in the paper bottom direction by moving the suction head 47A (47B) in the circumferential direction during suction. That is, the cam lever 61 is fixed to the projecting end of the intake pipe 43 from the bearing 41, and the cam follower 60 pivotally attached to the free end of the cam lever 61 is fixed to the frame 22 side. It is in contact with the outer peripheral cam surface. A spring lever 63 is split and fixed to the projecting end of the intake pipe 43 projecting from the bearing 42 on the other side plate 34 side. The spring lever 63 is pivotally attached to the stud 64 on the side plate 34 side. A compression coil spring 66 is provided on the spring shaft 65 so as to apply a rotational force in a direction in which the cam follower 60 is pressed against the cam surface of the cam 62 to the intake pipe 43. Reference numeral 67 denotes a stopper that restricts the rotation source of the cam lever 61 by contacting the bolt 68 on the cam lever 61 side.

  With this configuration, when the cam follower 60 moves up the upward inclined cam surface of the cam 62 during the suction of the paper by the suction head 47A (47B), the cam lever 61 rotates to suck the suction port via the intake pipe 43. 48 is moved in the long groove 49, and the adsorbed paper is pulled and tensioned.

  In this surface inspection cylinder 23, the paper side end portion with the leading end held by one claw 36A is adsorbed by one bottom side suction head 47A, and the paper end with the leading end held by the other claw 37B. The side end is adsorbed by the other bottom side adsorption head 47B.

  Similar to the front surface inspection cylinder 23, the back surface inspection cylinder 24 is provided with side plates 83 and 84, claws 86A and 86B, and butt side suction heads 87A and 87B. That is, the back surface inspection cylinder 24 is formed by a cylinder body 80 and end shafts 81 and 82 (one end shaft 82 is not shown) fixed to both ends thereof. The side plates 83 and 84 are fitted in contact with the end face of the trunk body 80, and the side plates 83 and 84 are supported so as to be movable in the circumferential direction with respect to the trunk body 80. These side plates 83 and 84 are fixed to the barrel main body 80 with bolts or the like during operation, and the fixing is released when an adjustment operation is performed in association with a change in paper size described later. Further, the side plates 83 and 84 and the trunk body 80 can be fixed and released by the actuator without using a tool.

  In addition, a pair of notches (not shown) are provided over the entire length of the cylinder at a position that bisects the circumferential direction of the circumferential surface of the back surface inspection cylinder 24. Claws 86A and 86B of the back surface inspection cylinder as second tip holding means for holding the tip of the cylinder are provided so as to be aligned in the axial direction of the cylinder. Further, between the side plates 83 and 84 of the back surface inspection cylinder 24, there are provided bottom side suction heads 87A and 87B for sucking the rear end of the paper with the front ends held by the claws 86A and 86B. These bottom side suction heads 87A and 87B are provided with a mechanism for pulling the paper in the paper bottom direction in the same manner as the bottom side suction heads 47A and 47B of the surface inspection cylinder 23 described above.

  In the back surface inspection cylinder 24, the bottom end of the paper with the leading end held by one claw 86A is adsorbed by one bottom side suction head 87A and the bottom end of the paper with the leading end held by the other claw 87B. The side end is adsorbed by the other bottom side adsorption head 87B.

  Next, the paper inspection apparatus 20 that is a feature of the present invention will be described with reference to FIG.

  On the end surfaces of the side plates 33, 34 of the surface inspection cylinder 23, first engagement pins 74, 74 are implanted so as to protrude from the end surface of the cylinder body 30. Corresponding to the first engagement pins 74, the left and right frames 22, 22 are provided with surface hooks 75, 75 as first engagement means. That is, the surface hook 75 has a base end portion 75a rotatably supported by a shaft 76 implanted in the frame 22, and the arrow B direction that is the anti-sheet conveyance direction of the surface inspection cylinder 23 from the base end portion 75a. A hook portion 75b bent at a right angle is provided at the swinging end portion positioned at.

  The hook 75 for surface is engaged with the first engagement pin 74, and thus the surface hook 75 is locked as a locking means for locking the first engagement pin 74 in cooperation with the hook portion 75b. A piece 77 is provided. As shown in FIG. 7, the hook 75 for the surface is always retracted to the outside of the trunk body 30 by the biasing means (not shown). On the other hand, when the surface hook actuator 100 (see FIG. 8) is driven, the base end portion 75a rotates about the shaft 76 in the counterclockwise direction in the drawing, so that the hook portion 75b becomes the first engagement pin. Advancing so as to face the end surface of the trunk body 30 so as to be able to engage with 74.

  Further, second engaging pins 94, 94 are planted on the end surfaces of the side plates 83, 84 of the back surface inspection cylinder 24 so as to protrude from the end surface of the cylinder body 80. Corresponding to the second engagement pin 94, the left and right frames 22, 22 are provided with back surface hooks 95 as second engagement means. That is, the back hook 95 has a base end portion 95a rotatably supported on a shaft 96 implanted in the frame 22, and the arrow B direction that is the anti-sheet conveyance direction of the back inspection cylinder 24 from the base end portion 95a. A hook portion 95b that is bent at a right angle is provided at the swinging end portion positioned at.

  The hook 95 for the back surface is engaged with the second engagement pin 94, thereby locking the back hook 95 as a locking means for locking the second engagement pin 94 in cooperation with the hook portion 95b. A piece 97 is provided. As shown in FIG. 7, the hook 95 for the back surface is always retracted to the outside of the trunk body 80 by a biasing means (not shown). On the other hand, when the back surface hook actuator 101 (see FIG. 8) is driven, the base end portion 95a rotates around the shaft 96 in the counterclockwise direction in the drawing, so that the hook portion 95b becomes the second engagement pin. It advances so that it may face the end surface of the trunk | drum main body 80 so that 94 can be engaged.

  Here, as will be described later with reference to FIG. 10, the front hook 75 and the rear hook 95 are located in the circumferential direction between the claw 36 </ b> A and the buttocks suction head 47 </ b> A, with the front inspection cylinder 23 positioned at the reference position. Since the length of L is L, the circumferential length between the claw 86A of the second conveying cylinder 24 and the buttocks suction head 87A is also set to the same L.

  In FIG. 8, reference numeral 102 denotes a paper size input device, which inputs the length of the paper to be printed on the duplex printing machine 1 in the vertical direction. Reference numeral 103 denotes a reference position detection sensor which detects that the phase in the rotation direction of the surface inspection cylinder 23 is located at the reference position. Reference numeral 104 denotes a rotary encoder that detects the rotational phase of the machine, 105 denotes a counter that counts pulses from the rotary encoder 104, and 106 denotes a machine motor that drives the machine in forward and reverse directions. Reference numeral 107 denotes a control device that receives the paper size data from the paper size input device 102, the detection signal from the reference position detection sensor 103, and the number of pulses from the counter 105. Control is performed to turn on / off the back hook actuator 101, drive the motor 106 in the forward / reverse direction, and stop driving.

  Next, the adjustment operation accompanying the paper size change of the sheet inspection apparatus of the duplex printing machine configured as described above will be described mainly with reference to FIGS. 7 and 9 to 11.

  Prior to the adjustment operation, the paper size to be changed is input to the paper size input means 102, and the fixing of the side plates 33, 34 of the front inspection cylinder 23 and the side plates 83, 84 of the back inspection cylinder 24 to the cylinder main bodies 30, 80 is released. deep. In this state, when the surface hook actuator 100 is actuated in FIG. 7, the surface hook 75 rotates in the counterclockwise direction in FIG. It advances so that it may face the end surface of the trunk | drum main body 30 so that the engagement pin 74 can be engaged. At the same time, by operating the back hook actuator 101, the back hook 95 rotates in the clockwise direction in the drawing with the shaft 96 as the center of rotation, so that the hook portion 95b can engage with the second engagement pin 94. So as to face the end face of the trunk body 80 (S1 in FIG. 9).

  In S2, when the motor 106 is rotated in the reverse direction, the surface inspection cylinder 23 rotates in the direction of arrow B, which is the anti-sheet conveyance direction, so that the side plates 33 and 34 are rotated in the direction of arrow B and the first engagement pin 74 is rotated. Is engaged with the hook portion 75b of the front surface hook 75, the rotation of the side plates 33 and 34 stops, so that the buttocks suction heads 47A and 47B also stop rotating. Similarly, since the back surface inspection cylinder 24 rotates in the direction of arrow B which is the anti-sheet conveyance direction, the side plates 83 and 84 also rotate in the direction of arrow B, and the second engagement pin 94 is the hook portion 95b of the back surface hook 95. Since the rotation of the side plates 83 and 84 is stopped when engaged, the bottom suction heads 87A and 87B also stop rotating.

  In this state, if the motor 106 is continuously rotated in the reverse direction, the surface inspection cylinder 23 and the back inspection cylinder 24 of the side plates 33, 34, 83, 84 whose rotation is restricted by the front and back hooks 75, 95 are controlled. Only the cylinder main bodies 30 and 80 rotate in the direction of arrow B, and the motor of the present machine is reversely rotated until the surface inspection cylinder 23 reaches the reference position, that is, until the reference position detection sensor 103 is turned on (S3). When the surface inspection cylinder 23 reaches the reference position, the reference position detection sensor 103 is turned on, and the driving of the motor 106 is stopped (S4). In this state, the circumferential length between the claw 36A of the surface inspection cylinder 23 and the butt side suction head 47A becomes the length L in the vertical direction of the minimum size paper as shown in FIG.

  As described above, when the surface inspection cylinder 23 is located at the reference position and the circumferential length between the claw 36A and the buttocks suction head 47A becomes L, the back hook 95 has a claw 86A of the back inspection cylinder 24. Since the circumferential length of the butt side suction head 87A is also set to the same length L, the circumferential direction between the claw 86A of the back inspection cylinder 24 and the butt side suction head 87A is provided. As shown in the same figure, the length of is also the same length L.

  In S4, the driving of the motor 106 is stopped. In S5, the counter 105 is reset and the count value is set to zero. In S6, the paper size data input in advance to the paper size input device 102 is read by the control device 107, and in S7, the target pulse number is calculated and set based on the paper size data.

  If this machine motor 106 is normally rotated in this state in S8, as shown in FIG. 11, the surface inspection cylinder 23 is rotated in the direction of arrow A which is the paper conveying direction. At this time, since the first engagement pin 74 is locked by the hook portion 74 of the surface hook 75 and the lock piece 77, the rotation of the side plates 33 and 34 is restricted. The heads 47A and 47B are also kept stopped. At the same time, the back surface inspection cylinder 24 is also rotated by the same angle as the front surface inspection cylinder 23 in the direction of arrow A, which is the paper conveyance direction. At this time, since the second engagement pin 94 is also locked by the hook portion 94 of the surface hook 49 and the lock piece 97, the rotation of the side plates 83 and 84 is restricted. The heads 87A and 87B are also kept stopped.

  In S9, the number of pulses of the counter 105 is read. In S10, the control unit 107 compares the number of pulses of the counter 105 with the target number of pulses calculated in S7. If the target number of pulses has not been reached, the process returns to S9 and returns to the counter 105. Read the number of pulses. In S10, when the number of pulses of the counter 105 becomes equal to the preset target pulse number, the driving of the motor 106 is stopped in S11, and the rotation of the front inspection cylinder 23 and the back inspection cylinder 24 is stopped.

  At this time, the circumferential length L1 between the claw 36A of the surface inspection cylinder 23 and the butt-side suction head 47A is the length in the vertical direction of the paper input to the paper size input device 102 in advance. Further, the circumferential length between the claw 86A of the back inspection cylinder 24 and the butt side suction head 87A is also the same L1. In S12, the surface hook actuator 101 is turned off, and the hook portion 75b of the surface hook 75 is retracted to the outside of the surface inspection cylinder 23, so that the engagement between the hook portion 75b and the first engagement pin 74 is released. Is done. At the same time, the back surface hook actuator 101 is turned off, and the hook portion 95b of the back surface hook 95 is retracted to the outside of the back surface inspection cylinder 24. Therefore, the engagement between the hook portion 95b and the second engagement pin 94 is released. The After the adjustment, the side plates 33 and 34 of the front surface inspection cylinder 23 and the side plates 83 and 84 of the back surface inspection cylinder 24 are fixed to the cylinder main bodies 30 and 80.

  When printing is started in the duplex printing machine 1 from this state, both sides of the paper fed one by one from the paper feeding device are printed by the plurality of printing units 2 and the impression cylinder 12 of the most downstream printing unit 2 is printed. To the transfer cylinder 25, and the tip is added by the claw 36A of the surface inspection cylinder 23 shown in FIG. Since the circumferential length L1 between the claw 36A and the bottom side suction head 47A is adjusted to the length in the top and bottom direction of the paper, the bottom end portion of the paper whose tip is held by the claw 36A As the inspection cylinder 23 rotates, it is sucked by the butt-side suction head 47A. At this time, since the paper-side suction head 47A moves in a direction away from the claw 36A by the above-described mechanism for pulling the paper in the paper bottom direction, the paper is tensioned and closely contacts the peripheral surface of the surface inspection cylinder 23. Therefore, in this state, when the surface inspection cylinder 23 rotates in the direction of arrow A, that is, the paper transport direction, and the surface of the paper is inspected by the surface inspection camera 28, the paper flutters or the surface of the paper is uneven. Therefore, the inspection can be performed accurately.

  Further, when the surface inspection cylinder 23 rotates in the direction of arrow A, the claw 36A of the surface inspection cylinder 23 and the claw 86A of the back inspection cylinder 24 are replaced, and the leading edge of the paper is held by the claw 86A. It is done. When the back inspection cylinder 24 is rotated in the direction of arrow A by the length L1 of the paper in the vertical direction, the bottom edge of the paper is taken by the bottom suction head 87A whose circumferential length with the claw 86A is adjusted to L1. Part is adsorbed. At this time, the bottom side suction head 87A is moved in a direction away from the claw 86A by the mechanism for pulling the paper in the paper bottom direction, so that the paper is tensioned and closely contacts the peripheral surface of the back inspection cylinder 24. Therefore, in this state, when the back surface inspection cylinder 24 rotates in the direction of arrow A and the back surface of the paper is inspected by the back surface inspection camera 29, the paper flutters or irregularities are formed on the back surface of the paper. There is nothing that can be done accurately.

  As described above, both sides of the sheet-like material can be accurately inspected by one paper threading. Further, if the circumferential phase of the bottom suction heads 47A and 47B with respect to the claws 36A and 36B of the front surface inspection cylinder 23 is adjusted in accordance with the size of the paper, it is automatically applied to the nails 86A and 86B of the back surface inspection cylinder 24. Since the circumferential phase of the bottom suction heads 87A and 87B is adjusted in accordance with the paper size, the adjustment work of the bottom suction heads 87A and 87B accompanying the paper size change can be performed easily and in a short time. Can do.

  In the present embodiment, an example of paper is shown as the sheet-like material, but a film-like sheet may be used. Further, in the present embodiment, the machine motor 106 is driven in the reverse direction to move the surface inspection cylinder 23 to the reference position, and when reaching the reference position, the claw 36A of the surface inspection cylinder 23 and the butt side suction head The circumferential length L between 47A and 47A is set to the length in the vertical direction of the minimum size paper, but may be equal to or less than the length in the vertical direction of the minimum size paper. In addition, the hook portion 75b of the front surface hook 75 is turned so that the pin 74 engages with the hook portion 75b of the rear surface hook 95 when the surface inspection cylinder 23 rotates in the paper transport direction. The direction of the hook portion 95b is changed so that the pin 94 engages when the inspection cylinder 24 rotates in the paper conveyance direction, and the machine motor 106 is driven in the forward direction to move to the reference position. , And the bottom suction heads 47A, 47B, 87A, 87B may be positioned at positions corresponding to the changed paper sizes. In this case, the reference position is set so that the circumferential length between the claw 36A of the surface inspection cylinder 23 and the butt-side suction head 47A is equal to or greater than the vertical length of the maximum size paper.

It is a side view which shows a part of double-sided printing machine which employ | adopted the sheet-like object inspection apparatus of the double-sided printing machine which concerns on this invention. It is a top view of the surface inspection cylinder in the sheet-like object inspection apparatus of the double-sided printing machine which concerns on this invention. FIG. 3 is a view taken in the direction of arrow III in FIG. 2. It is IV arrow line view in FIG. It is the VV sectional view taken on the line in FIG. FIG. 4 is a detailed side view of a bottom side suction head viewed from the same direction as in FIG. 3. It is a side view of the principal part of the double-sided printing machine which employ | adopted the sheet-like object inspection apparatus of the double-sided printing machine which concerns on this invention. It is a block diagram which shows the structure of the sheet-like object inspection apparatus of the double-sided printing machine which concerns on this invention. It is a flowchart of the sheet-like object inspection apparatus of the double-sided printing machine which concerns on this invention. It is a side view of the principal part which shows the state which rotated the surface inspection cylinder to the reference position in the sheet-like object inspection apparatus of the double-sided printing machine which concerns on this invention. FIG. 6 is a side view of a main part showing a state in which a surface inspection cylinder is rotated so as to correspond to a sheet-like material of a specified size in the sheet-like object inspection device of the double-sided printing machine according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Duplex printing machine, 2 ... Printing unit, 3 ... Paper discharge apparatus, 10 ... Plate cylinder, 20 ... Paper inspection apparatus, 23 ... Front inspection cylinder (1st conveyance cylinder), 24 ... Back surface inspection cylinder (2nd (Conveyance cylinder), 28 ... surface inspection camera, 29 ... back surface inspection camera, 33, 34, 83, 84 ... side plate, 36A, 36B ... gripper claws (first tip holding means), 47A, 47B ... Ass side suction head (first rear end holding means), 74 ... first engagement pin, 75 ... front hook (first engagement means), 77, 97 ... lock piece, 86A, 86B ... back surface Mouth claw (second tip holding means) of inspection cylinder, 87A, 87B ... Butt side suction head (second rear end holding means), 94 ... Second engagement pin, 95 ... Back hook (first 2), 100... Actuator for front surface hook, 101... Actuator for back surface hook , 102 ... sheet size input device, 103 ... reference position sensor, 104 ... rotary encoder, 105 ... counter, 106 ... the motor, 107 ... control device.

Claims (4)

A first transport cylinder provided with first tip holding means for holding the tip of the sheet-like material;
The second conveying cylinder is connected to the first conveying cylinder and is provided downstream of the first conveying cylinder in the sheet conveying direction, and includes a second tip holding means for holding the leading edge of the sheet. A transfer cylinder;
First inspection means for inspecting one surface of the sheet-like material conveyed by the first conveyance cylinder;
In a sheet-like object inspection apparatus for a double-sided printing machine, comprising: a second inspection unit that inspects the other surface of the sheet-like object conveyed by the second conveyance cylinder.
A first rear which is supported by the first conveying cylinder so as to be movable in the circumferential direction of the first conveying cylinder and holds the rear end portion of the sheet-like material held by the first tip holding means. End holding means;
A second rear end which is supported by the second transfer cylinder so as to be movable in the circumferential direction of the second transfer cylinder and holds the rear end portion of the sheet-like material held by the second tip end holding means. End holding means;
First engagement means supported on the frame side and engaged with the first rear end holding means side;
Second engagement means supported on the frame side and engaged with the second rear end holding means side;
During the rotation of the first transport cylinder to a predetermined reference position, the first rear end portion holding means and the second rear end portion holding means are the first engagement means and the first engagement means. Each of the two engaging means, and the position of the first front end holding means relative to the first rear end holding means and the second front end by the further rotation of the first transport cylinder The position of the holding means relative to the second rear end holding means is changed, and the first conveying cylinder is positioned at the reference position, so that the anti-sheet-like material conveying direction from the first leading edge holding means. A circumferential length between the first rear end holding means and the second rear end holding means directed from the second front end holding means to the anti-sheet-like material conveying direction. The first engagement means and the second engagement so that the circumferential length between them is the same. Sheet inspection apparatus for double-sided printing machine, characterized in that disposed means. In the sheet-like object inspection apparatus of the double-sided printing machine according to claim 1,
The rotation direction of the first transport cylinder to the reference position is the anti-sheet-like material transport direction,
The circumferential length between the first front end holding means and the first rear end holding means in the anti-sheet-like material conveying direction is equal to or less than the vertical length of the sheet of the smallest size. A sheet-like object inspection apparatus for a double-sided printing machine. In the sheet-like object inspection apparatus of the double-sided printing machine according to claim 1,
The first engaging means and the second engaging means include a first engaging pin and a second engaging pin fixed to the first rear end holding means side and the second rear end holding means side, respectively. The first rear end holding means and the second rear end holding means are moved relative to the first engagement means and the second engagement means, respectively. A sheet-like object inspection device for a double-sided printing machine, comprising a locking means for disabling. In the sheet-like object inspection apparatus of the double-sided printing machine according to claim 1,
Drive means for rotating the first transport cylinder;
Control means for controlling the driving means,
The control means rotates the first conveying cylinder in one direction to the reference position, and then rotates the driving means to rotate in a direction opposite to the one direction to a position corresponding to the size of the sheet-like material. Controlling and positioning the first and second rear end holding means to a position to hold the rear end of the sheet-like material held by the first and second front end holding means. Sheet inspection device for printing machines.

Images