JPH0621718Y2 - Unauthorized printing paper detection device in sheet-fed printing press - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a sheet-fed printing press, and detects and sorts out illegal paper among printing papers that are conveyed while being held by a nail and attached to the peripheral surface of the body. The present invention relates to an unauthorized printing paper detection device.

[Conventional technology]

In the sheet-fed printing press, the printing paper supplied to the printing unit by the paper feeding device is printed by the printing cylinder and then conveyed by the paper ejection chain to be ejected and stacked on the paper tray of the paper ejection device.

In such a printing operation, misregistration and oil stains may occur due to various causes, so it is necessary to remove the illegal paper so that it is not mixed with the normal paper and shipped.

Therefore, after printing, the pixels from the start end to the end of each printing paper heading to the paper discharge device are detected by a sensor or a camera to determine the difference between the density value and the density value of each pixel of the standard image,
There has been developed an illegal printing paper detection device that ejects illegal paper onto another paper ejection receiver according to the signal, or puts a mark on the illegal paper and removes it after stacking.

This type of fraudulent paper detection device is a printing paper that is conventionally conveyed while it is held by a nail and attached to the peripheral surface of the cylinder, with a detector such as a camera facing the peripheral surface of the cylinder that is provided on the downstream side of the printing cylinder. There is used a structure in which an illegal paper is selected by detecting the density value of the.

[Problems to be solved by the invention]

However, in such a conventional fraudulent printing paper detection device, the printing paper that should be closely attached to the peripheral surface of the body may float or flick from the peripheral surface of the body and may not be correctly detected. Atsuta Therefore, conventionally, a nozzle has been provided in the vicinity of the detector to stabilize the paper by blowing air on it, but in this case, even if it is effective for thin paper, if the paper thickness becomes thick, Since it is strong, it does not come into close contact with the circumferential surface of the body even when air is blown, and there is a problem that accurate detection cannot be performed. Further, as disclosed in Japanese Patent Publication No. 64553/1982, in the case where a suction port is provided in the groove on the cylinder side instead of the nozzle to press the paper against the peripheral surface of the cylinder by suction, the paper is sucked into the groove. And becomes uneven in the axial direction,
There is a problem that the entire paper becomes corrugated and accurate detection cannot be expected.

[Means for solving problems]

In order to solve such a problem, according to the present invention, a cam connected to a suction air source is provided in each of a plurality of arc-shaped long grooves arranged in parallel in the axial direction along the outer peripheral surface of the body facing the detector. A suction head provided with a suction port that is driven to move back and forth in the circumferential direction along the long groove by a mechanism; and a circular cylinder-shaped long groove having an outer peripheral surface having substantially the same diameter as the outer peripheral surface of the cylinder. And a guide located upstream of the suction head in the cylinder rotation direction is provided, and the suction head and the guide are supported by a support member that is movable and adjustable in the circumferential direction of the cylinder.

[Action]

The suction air at the suction port of the suction head acts on the paper tail portion of the paper that is carried while being held by the nail and attached to the body circumferential surface, and the suction head moves in the direction away from the nail. It is attracted to the mouthpiece and stretched in a direction away from the nail, and it becomes tense and adheres tightly to the body surface. When the paper size is changed, the suction head and the guide are also moved in the circumferential direction by moving the supporting member, which corresponds to the paper size. The guide provided on the upstream side of the conveyance of the suction head moving in the long groove does not cause the paper to be sucked into the groove and become a corrugated plate.

〔Example〕

1 to 6 show an embodiment of an illegal printing paper detecting device according to the present invention, FIG. 1 is a plan view of a transfer cylinder for detecting illegal printing paper, and FIG. 2 is a side view as seen from A in FIG. 3, FIG. 3 is a side view of FIG. 1 as viewed from B, FIG. 4 is a cross-sectional view of CC of FIG. 1, and FIG. 5 is a detailed side view of the paper tail suction device viewed from the same direction as FIG.
The figure is a side view of a sheet-fed printing press embodying the present invention. Sixth
In the figure, a printing machine 1 includes a paper feeding device 2, a plurality of sets of printing units 3, and a non-paper device 4, and the paper feeding device 2 of these papers is loaded with paper 5 and is automatically raised. Paper tray 6
And a not-shown stacking device and a conveying device which are arranged above the paper 5 and suck the paper 5 one by one from the upper layer and send it to the difference plate 7. Further, each printing unit 3 is provided with a plate cylinder 8, a blanket cylinder 9, and an impression cylinder 10 which are in contact with each other, and between the impression cylinders 10 of the adjacent printing units 3, a transfer cylinder 11 and a double-diameter transfer cylinder 12 are provided. Are disposed with their peripheral surfaces facing each other. Further, a swing device 13 is provided diagonally above the first-color impression cylinder 10. On the other hand, the paper discharge device 4 is provided with a paper discharge cylinder 14 and a pair of left and right sprockets 15 coaxially mounted on the paper discharge cylinder 14, and the left and right sides of the sprockets 15 and the front end portion of the paper discharge frame 16 are arranged. Between the pair of sprockets 17, a pair of left and right paper ejection chains 18 are stretched by being diverted by a diverting sprocket 19 or the like. A plurality of paper ejection claws (not shown) are juxtaposed on each of the claw rods (not shown) supported by the left and right paper ejection chains 18 at regular intervals. A paper stacking table 20 for stacking the paper 5 and automatically descending is provided below the conveying end portion of the paper discharge chain 18.

Between the final printing unit 3 and the paper discharge device 4, a fraudulent paper detection unit indicated by reference numeral 30 is provided. This fraudulent paper detection unit 30 includes the frame 31 of the printing unit 3 and the paper ejection frame 16. It is provided with left and right frames 32 that connect with each other. A double-diameter transfer cylinder 33 for detecting illegal paper, which will be described in detail later, is axially supported on the frame 32. Between the transfer cylinder 33 and the impression cylinder 10 of the printing unit 3,
A transfer cylinder 34 is provided with the circumferential surfaces of the cylinders 33, 10 in contact with each other. Further, the discharge cylinder 14 has a peripheral surface abutting on the transfer cylinder 33. A detector 35 such as a television camera or a sensor is arranged above the transfer drum 33 so as to face the circumferential surface of the drum. The printing unit 3, the detection unit 30, and the paper discharge device 4 are connected to each other by machine bases 36, 3
It is placed and fixed on 7,38. The entire printing press 1 is driven by the motor 21 from the transfer drum 12 side for the first color.

Therefore, the structure of the transfer drum 33 will be described with reference to FIGS. 1 to 5. The transfer barrel 33 is formed of a barrel main body 40 and end shafts 41, 42 fixed to both ends thereof, and the end shafts 41, 42 on both sides have side plates 43, which are shaped like lanterns, respectively.
44 is fitted in contact with the end face of the body 40 of the body, and the body 4 of the body 4 is adjusted according to the paper size by an adjusting device (not shown).
0 and the side plates 43 and 44 are arranged so that the phases in the circumferential direction are adjusted. 2 around the outer circumference of the body 40
A claw base bar 46 is fixed to one end of each notch 45 provided at equal positions over the entire length of the body, and a plurality of claw bases 47 are provided in the notches at the outer corners thereof. It is installed side by side in parallel. Further, the bearings 48, 49 fixed to both end plates of the body 40 and the bearing 49 in the notch 45.
A hollow claw shaft 50 is rotatably supported at a, and a cam follower 52 is provided at a free end portion at a bearing 49 side protruding end of the claw shaft 50 into which a bush 51 is fitted. The cam lever 53 pivotally mounted is fixed by split tightening. On the claw shaft 50, a plurality of claws 54 holding the front end of the paper 5 between the claw base 47 and the claw base 47 are fixed in a fixed manner corresponding to each claw base 47, and the protruding end of the claw shaft 50 on the bearing 48 side. The spring fixing lever 55 is split and fixed to the portion, and the bolt 5 inserted into the long hole
It is fixed to the body end plate at 6. Reference numeral 57 denotes a torsion bar which penetrates the claw shaft 50 and has one hexagonal head fitted and fixed in the hexagonal hole of the bush 51 and the other hexagonal head in the hexagonal hole of the spring fixing lever 55. The cam follower 52 is fitted and fixed, while the cam follower 52 is in contact with the outer peripheral cam surface of the pawl opening / closing cam 58 fixed to the frame side. When the spring fixing lever 55 is rotated and fixed in this way, a torsion spring force is accumulated in the torsion bar 57 and the cam follower 52 is pressed against the cam surface of the pawl opening / closing cam 58, and due to the body rotation, the cam follower 52 rises on the cam surface. After this, the pawl 54 is configured to open and close by the cooperation of the cam surface and the torsion bar 57. And the claws 54 are on both bodies 34,
It opens and closes at the counter contact with 14, and grips the paper 5 between these cylinders. In FIGS. 2 and 3, only one row of the pawl device is shown, and the pawl device in the notch 45 on the opposite side is not shown.

In this way, a paper tail suction device, generally designated by the numeral 60, is provided at the paper tail corresponding portion of the paper 5 that is gripped and conveyed by the claw 54. That is, circular bearings 61 and 62 are bolted to the outer surfaces of the left and right side plates 43 and 44, respectively, and an intake pipe 63 is provided between these bearings 61 and 62.
Is rotatably supported, and another intake pipe 65 is fixed between the shaft hole of the side plate 43 and the bearing plate 64 fixed to the other side plate 44. Has been done. As shown in FIGS. 1 and 5, both intake pipes 63 and 65 are connected by a connecting plate 66 at the central portion in the body axis direction, and are connected by a communication hole 66a provided in this connecting plate 66. There is. A plurality of suction heads 67 are axially juxtaposed to one of the intake pipes 63 and fixed in place. The suction port 68 at the tip of the suction heads 67 and the guide 68a fixed to the intake pipe 65 are
A plurality of long grooves 69 extending in the circumferential direction, which are provided in parallel on the circumferential surface of the body in the axial direction, are engaged with the side plates 43, 43 so as to be movable in the circumferential direction. The outer peripheral surface of the guide 68a is formed to have substantially the same diameter as the diameter of the transfer drum 33 so as not to be uneven with respect to the peripheral surface of the transfer drum 33. A plurality of intake holes 70 provided in the intake port 68 are opened in the circumferential surface of the body, and the intake hole 70 and the inner hole of the intake pipe 63 are connected by an air passage 71. Reference numeral 72 is a valve for adjusting the air passage 71. On the other hand, on the side plate 43, an annular valve ring 74 is supported by an air short pipe 76 projecting from the side plate 43 side into a pair of circular holes 75 so as to be slightly retractable in the trunk axial direction. The air passage 77 communicates with the inner hole of the intake pipe 65. 78 is a valve ring 74 interposed between the side plate 43 and the valve ring 74.
It is a compression coil spring for elastic firing. The air passage 77
Is provided on a connecting fitting 79 fixed to the back side of the side plate 43 by fitting one end of the intake pipe 65. With this configuration, when the transfer cylinder 33 is rotated while the suction air acts on the rotary valve and the valve ring 73 is pressed against this, the long hole of the rotary valve and the air short pipe 76 face each other. Only when they are communicated with each other, the air is sucked from the intake hole 70 through the air passages 77, 66a, 71 at a predetermined timing, that is, while the paper 5 is being gripped and conveyed by the claws 54, and the tail of the paper is adsorbed to the peripheral surface of the body.

Further, the paper head suction device 60 has a suction head 6 at the time of suction.
A mechanism for pulling the paper 5 in the paper edge direction by moving the paper 7 in the circumferential direction is provided. That is, the bearing 61 of the intake pipe 63
A cam lever 81 having a cam follower 80 pivotally attached to a free end thereof is fixed to the projecting end thereof by split clamping, and the cam follower 80 is in contact with an outer peripheral cam surface of a cam 82 fixed to the frame side. . The bearing 62 on the other side plate 44 side
At the protruding end of the intake pipe 63 protruding from the spring lever 83
Is split and fixed, and a spring shaft 85 pivotally attached to the spring lever 83 and inserted into the stud 84 on the side plate 44 side.
A compression coil spring 86 is provided above the compression coil spring 86, which imparts a rotational force to the intake pipe 63 in a direction to press the cam follower 80 against the cam surface of the cam 82. Reference numeral 87 is a stopper that abuts the bolt 88 on the cam lever 81 side to regulate the rotation limit of the cam lever 81. With this structure, when the cam follower 80 moves up the ascending sloped cam surface of the cam 82 during the suction of the paper 5 by the suction head 67, the cam lever 81 rotates to move the suction port 68 through the suction pipe 63. Long groove 6
Then, the paper 5 that has been adsorbed is pulled and stretched to be tensioned.

The operation of the illegal printing paper detection device configured as described above will be described. The papers 5 on the paper stack 6 that have been sucked by a sucker device (not shown) are sent to the difference plate 7, gripped one by one by the swing device 13, and replaced by the claws of the impression cylinder 10. After that, the paper 5 being conveyed while being gripped by the impression cylinder 10 and the transfer cylinders 11 and 12 is conveyed from the plate surface to the blanket cylinders when passing between the blanket cylinder 9 and the impression cylinder 10 of each color. The image transferred to the blanket surface of 9 is transferred and printed. When the paper 5 after printing is conveyed by being attached to the transfer drum 33, the print density value of the paper 5 is detected by the detector 30 one by one, and this is the density of the standard image due to, for example, oil stains or misregistration. When there is a difference between the value and the value, that is, when illegal printing paper occurs, a signal is issued. This signal is sent to the non-paper device 4 via, for example, a timer, and when the illegal paper arrives at the gripper release section of the paper ejecting device 4, the illegal paper is ejected to a path different from that on the paper stacking table 20, or the illegal paper is ejected. A normal paper and an illegal paper are distinguished by inserting a tape there.

In such an illegal printing paper detection operation, when the claw of the transfer drum 34 and the claw 54 of the detection transfer drum 33 face each other, the cam follower 52 passes over the crest of the claw opening / closing cam 58 and cooperates with the torsion bar 57. Is opened and closed, the paper 5 is gripped by the pawl 54 as the pawls on the transfer drum 34 side are opened and closed, and is conveyed while being attached to the peripheral surface of the drum. At this time, the valve ring 73 of the transfer drum 33 is rotating while being pressed against a rotary valve (not shown) by the elastic force of the compression coil spring 78, and the paper tail of the conveying paper 5 reaches the counter contacts of the drums 34, 33. When the air short pipe 76 and the long hole of the rotary valve start to face each other, the intake hole 70 of the suction port 68 is closed by the air passages 71, 66a, 7a.
It is communicated with the suction air source through 7, and the paper tail is adsorbed by the suction port 70. When the cam follower 80 slightly lags behind the suction of the trailing edge of the paper, goes up to the mountain of the cam 82, and the cam lever 81 rotates together with the intake pipe 63 in the counterclockwise direction in FIG. Since the paper tail moves along the direction 69 away from the claw 54 in the paper tail direction, the paper tail adsorbed by the suction port 68 is stretched and tightly adheres to the body circumferential surface.

When the trailing edge of the paper reaches the counter contact point between the two bodies 33, 14, the air short pipe 76 passes through the long hole of the rotary valve, and the cam follower 80 descends the mountain of the cam 82.
8 is released from suction.

When the paper size is changed, the side plates 43 and 44 are unfixed from the body 40, and the relative positions are moved in the circumferential direction.
The positions of the paper tail suction device 60 composed of 3, 65 and the like and the guide 68a move in the circumferential direction with respect to the claw 54 to correspond to the paper size.

[Effect of device]

As is apparent from the above description, according to the present invention, in the unauthorized printing paper detection device for detecting the printing surface of the paper that is abutted on the peripheral surface of the cylinder, along the outer peripheral surface of the cylinder facing the detector. In each of the arc-shaped long grooves of multiple threads that are installed side by side in the axial direction,
By providing a suction head having a suction port that is connected to a suction air source and is driven to move back and forth in the circumferential direction along the long groove by a cam mechanism, the paper tail of the paper that is conveyed in contact with the circumferential surface of the cylinder is sucked. It is drawn in by the cam mechanism and is pulled by the cam mechanism in the direction away from the nails and becomes tense and adheres to the body circumference surface.Therefore, in the case of thin paper as well as thick thick paper, it should be adhered to the body circumference surface to stabilize. Therefore, the printing surface can be accurately detected without error. Further, in the arc-shaped long groove, there is provided a guide having an outer peripheral surface having substantially the same diameter as the outer peripheral surface of the cylinder, which is movable in the circumferential direction of the cylinder and positioned upstream of the suction head in the cylinder rotation direction. As a result, the paper is not sucked into the long groove and becomes uneven in the axial direction, and the entire paper does not have a corrugated plate shape, which enables accurate detection. Further, since the suction head and the guide are supported by the support member which is movable and adjustable in the circumferential direction of the cylinder, it is easy to deal with the change of the paper size.

[Brief description of drawings]

1 to 6 show an embodiment of an illegal printing paper detection device in a sheet-fed printing press according to the present invention, FIG. 1 is a plan view of an illegal printing paper detection transfer cylinder, and FIG. 2 is FIG. A side view of FIG. 3A, FIG. 3 is a side view B of FIG. 1, and FIG. 4C of FIG.
FIG. 5 is a sectional side view of C, FIG. 5 is a detailed side view of the paper edge adsorption device viewed from the same direction as FIG. 2, and FIG. 6 is a side view of a sheet-fed printing press embodying the present invention. 1 ... Printing machine, 5 ... Paper, 33 ... Transfer cylinder, 35 ... Detector, 40 ... Cylinder body, 43, 44 ... Side plate, 54 ...
Nail, 60 ... Paper bottom suction device, 63, 65 ... Suction shaft, 6
7 ... Suction head, 68 ... Suction port, 68a ... Guide,
69 ... long groove, 70 ... intake hole 80 ... cam follower,
81 ... Cam lever, 82 ... Cam, 85 ... Compression coil spring.

Claims (1)

[Scope of utility model registration request] Claims: 1. A plurality of arcuate long grooves arranged in parallel in the axial direction along the outer peripheral surface of the body facing the detector, are connected to a suction air source, and are circumferentially surrounded by a cam mechanism along the long grooves. A suction head having a suction port that is driven to move back and forth in a direction, and an outer circumferential surface having a diameter substantially equal to that of the outer circumferential surface of the cylinder in the arc-shaped long groove, and the suction head is movable in the circumferential direction of the cylinder. A guide located upstream of the cylinder in the cylinder rotation direction, and the suction head and the guide are supported by a support member that is movable and adjustable in the circumferential direction of the cylinder. Printing paper detection device.