JP2617102B2 - Sheet-fed rotary printing press - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a sheet-fed rotary printing press.

[Conventional technology]

Sheet-fed rotary printing presses are classified into lithographic printing presses, letterpress printing presses, and intaglio printing presses according to the type of printing plate. Among them, lithographic printing presses are multicolor printing presses as shown in a schematic side view in FIG. It is configured. In FIG. 1, a printing press 1 includes a paper feeder 2, a plurality of sets of printing units 3, and a paper discharger 4. Of these, the paper feeder 2 loads paper 5 and automatically And a paper stack 6 that is disposed above the paper 5.
And a transport device (not shown) for sucking the sheets one by one from the upper layer and sending them onto the difference plate 7. Each printing unit 3 includes a plate cylinder 8, a blanket cylinder 9, and an impression cylinder 10 that are in contact with each other. Between the impression cylinders 10 of the adjacent printing units 3, a transfer cylinder 11 and a transfer cylinder having a double diameter are provided. 12 are arranged with their peripheral surfaces in contact with each other. Further, a swing device 13 is provided diagonally above the impression cylinder 10 of the first color, and a paper discharge cylinder 14 is in contact with the final impression cylinder 10. Reference numeral 15 denotes a pair of left and right sprockets that are coaxially mounted on the paper discharge cylinder 14, and between the sprocket 15 and the pair of right and left sprockets 17 disposed at the front end of the paper discharge frame 16. A pair of left and right discharge chains 18 are deflected and stretched by diverting sprockets 19 and the like, and each claw pole (not shown) supported at a fixed interval between the left and right discharge chains 18. A plurality of paper ejection claws (not shown) are respectively provided on the upper side. Below the conveyance end portion of the paper discharge chain 18, a paper stacking table 20 for stacking the paper 5 and automatically descending is provided. Then, each of these devices is
It is driven from the transfer cylinder 12 side of the color.

With this configuration, the uppermost sheet 5 on the sheet stack 6 suctioned by the sucker device (not shown) is
The sheet is sent upward and is held one by one by the swing device 13 and is replaced by the claw of the impression cylinder 10. Thereafter, the paper 5 conveyed while being held between the impression cylinder 10 and the transfer cylinders 11 and 12 by the claws is moved from the plate surface to the blanket cylinder when passing between the impression cylinder 10 and the impression cylinder 10 of each color. Printing is performed by transferring the image transferred to the blanket surface of No. 9. The paper 5 on which the image of the final color is printed is changed from the claw of the impression cylinder 10 to the discharge claw of the discharge chain 18 by the cooperation of the discharge cylinder 14, and the discharged paper travels in the direction indicated by the arrow in the figure. After being conveyed by the chain 18, it is released from the grip of the claw at the end of the conveyance and
Loaded on top.

In such printing work, misregistration may occur due to various causes, such as misregistration, oil stains, and set-off, and illegal paper may be generated. There is.

Therefore, the pixels from the beginning to the end of each sequentially conveyed printed matter are detected by a sensor or a camera, and the difference between the density value and the density value of each pixel of the standard image is determined. Recently, a fraudulent paper detecting device that discharges paper onto another paper receiving tray or attaches a mark to fraudulent paper has been developed, and users have been requesting to attach it to a printing press.

[Problems to be solved by the invention]

However, in order for such an unauthorized paper detection device to operate correctly, it is necessary to provide a device that tensions the printed matter to be detected without first detecting it. It must be provided downstream of the final printing unit. However, if it is to be attached to an existing printing press, it will require a significant remodeling, and almost no remodeling is possible.

[Means for solving the problem]

In order to solve such a problem, in the present invention, a frame of an unauthorized paper detection unit is interposed between the printing unit and the paper ejection device, and the traveling part is formed by a part of the added part and the existing part which has been relocated. The frame is provided with a cylinder or a support plate as printing paper stabilizing means for attaching and tensioning the printing paper to be attached, and a detection device for detecting the print density of the printing paper tensioned by the cylinder or the support plate is provided.

[Action]

After printing, the printing paper conveyed by the cylinder or the discharge chain travels without slack by being in contact with the cylinder itself or the support plate provided on the traveling path, and the print density is detected. Is detected, a signal is issued to discharge the illegal paper to another path to distinguish it from normal paper. The unauthorized paper detection device is provided by using the added minimum part and a part of the existing paper discharge cylinder and paper discharge chain.

〔Example〕

FIG. 1 is a schematic side view of a multicolor lithographic sheet-fed rotary printing press to which a sheet-fed rotary printing press according to the present invention is applied. FIG. Has the same configuration as that of the printing paper not provided with the unauthorized paper detecting device shown in FIG.

Between the printing unit 3 at the last stage and the paper discharging device 4, there is provided a fraudulent paper detecting unit indicated by the reference numeral 30 as a whole. It has left and right frames 32 for connecting with the paper frame 16. In this frame 32, a double-diameter transfer cylinder 33 as a transporting means also serving as a means for stabilizing the printing paper is supported, and in FIG. 4, the bearing on which the paper discharge cylinder 14 is supported is The transfer cylinder 34 has a circumferential surface with the impression cylinder 10 and a double diameter transfer cylinder.
It is supported in contact with the peripheral surface with 33. In FIG. 4, the discharge cylinder 14 which has been in contact with the impression cylinder 10 is supported by left and right frames 32 in contact with the double-diameter transfer cylinder 33 in this unit 30. On the same sprocket 15 as that shown in FIG. 4, a paper ejection chain 18 is also stretched. Then, the printed paper 5 is transferred from the nail of the impression cylinder 10 to the transfer cylinder.
It is configured so that it is replaced by the claw of 34, further replaced by the claw of the double-diameter transfer cylinder 33, transported while being in contact with the peripheral surface, and then transported by being replaced by the claw of the discharge chain 18. I have. Further, above the double-diameter transfer cylinder 33, a detection device 35 is provided, and the print density value of each pixel of the paper 5 conveyed while being in contact with the double-diameter transfer cylinder 33 is determined one by one at the end of the paper. From the end to the end, determine the difference from the print density value of each pixel of the standard image, and issue a signal when there is a difference. The beds 36 and 37 on which the printing unit 3 and the paper discharging device 4 are mounted and fixed are additionally connected by the frame 32.

With the above-described configuration, when the printed paper 5 is conveyed while being attached to the double-diameter transfer cylinder 33, the detection device 35 detects the print density value for each sheet. A signal is issued when there is a difference from the density value of the standard image due to oil stain, set-off, misregistration, or the like, that is, when an illegal paper is generated. This signal is sent to the paper output device 4 via, for example, a timer, and when the illegal paper arrives at the portion of the paper output device 4 where the grip is released, the illegal paper is discharged to a path different from that on the paper stacking platform 20, or the illegal It is configured to discriminate between normal paper and illegal paper by inserting a tape into the paper.
In this case, since the paper 5 is in tension while being in contact with the double-diameter transfer cylinder 33, accurate detection is possible because the paper surface is in a stable state.

The modification of the printing press to attach the unauthorized paper detection device is performed only by adding the frame 32, the double-diameter transfer cylinder 33 and the transfer cylinder 34, and moving the discharge cylinder 14, and the printing unit 3 and the discharge device. Since the existing bearing can be used as it is as well as the bearing of the transfer cylinder 34, the remodeling is easy.

FIG. 2 is a schematic side view of a multicolor lithographic sheet-fed rotary printing press showing an embodiment of the second invention, and only modified portions will be described. The illegitimate paper detection unit 40 is the printing unit 3 in the last stage.
And the left and right frames 42 fixedly mounted on an additional bed 41 by connecting the frame 31 of the sheet discharging device 4 with the frame 31 of the sheet discharging device 4. . Further, on the upstream side and the downstream side of the double-diameter transfer drum 43, a transfer drum 44 and another discharge drum 14 different from the existing discharge drum 14, that is, another discharge drum 45 contacts and is supported, and is supported. A pair of left and right transport chains 47 having claws is stretched between a sprocket 46 coaxial with the transfer drum 44 and the existing sprocket 15. Further, an existing paper discharge chain 18 is stretched around a sprocket 48 coaxial with the other paper discharge cylinder 45. 49 is the same detector as shown in FIG.

With this configuration, the printed paper 5
Is transported from the pawl of the impression cylinder 10 to the pawl of the transport chain 47, and further conveyed while being replaced by the pawl of the double-diameter transfer drum 43 while being in contact with the peripheral surface.
It is transported after being replaced with 18 nails. At this time, since the paper 5 is detected in a tensioned state attached to the peripheral surface of the double-diameter transfer cylinder 43, the paper surface is stable and accurate detection is performed. The parts added for remodeling are only the bed 41, the frame 42, the double-diameter transfer cylinder 43, the transfer cylinder 44, the other discharge cylinders 45, the sprockets 46 and 48, and the chain 47, and the other parts are Since it can be used, remodeling is easy.

FIG. 3 is a schematic side view of a multicolor lithographic sheet-fed rotary printing press showing an embodiment of the third invention, and only modified portions will be described. The unauthorized paper detection unit 50 is connected to the printing unit 31.
And an additional bed 51 by connecting the
There are left and right frames 52 mounted and fixed on the upper side, and the paper discharge chain 18 is extended by the frame 52. The detecting device 53 is provided in the transport path of the paper discharge chain 18, and a support plate 54 functioning as a means for stabilizing the printing paper to which the transported paper 5 is attached is provided below the detecting device 53. I have.

With this configuration, the output chain
Since the paper 5 conveyed by 18 is detected by the detection device 53 in a state of being in tension while being in contact with the support plate 54, accurate detection is possible. In addition, the modification for providing the unauthorized paper detection device includes adding a bed 51 and a frame 52, and
It is easy to modify because it is only extended.

In each of the above embodiments, the print density values detected by the detection devices 45, 49, and 53 can be displayed on a display. In each of the above-described embodiments, an example in which the present invention is applied to a multicolor printing lithographic sheet-fed rotary printing press is shown. However, the present invention can be similarly applied to a single-color printing, an intaglio printing press, and a relief printing press.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, a paper feed device, a printing unit, and a paper discharge device are provided, and a tension is set between a sprocket that is coaxially mounted on a paper discharge cylinder and the paper discharge device. In a sheet-fed rotary printing press that discharges printing paper by a chain of a paper discharging device that is bridged, a frame of an unauthorized paper detecting unit is interposed between the printing unit and the paper discharging device, and the diameter of the frame is doubled. A transfer cylinder is provided in the printing unit so as to be adjacent to the double-diameter transfer cylinder, and the discharge cylinder and its sprocket are disposed on the discharge device side and adjacent to the double-diameter transfer cylinder. And a detection device for detecting a print density of printing paper in the vicinity of the double-diameter transfer cylinder by stretching a chain of the paper discharge device between the sprocket and the paper discharge device. By providing, printing paper Since the detection device detects the paper in a tensioned state while being attached to the transfer cylinder of the diameter, it is possible to accurately detect illegal paper and improve the quality of printed matter, and the existing printing press is equipped with an illegal paper detection device. When remodeling a printing press, it is only necessary to add the transfer cylinder, double-diameter transfer cylinder and frame, using the existing part as it is, reducing equipment costs and facilitating the installation of an illegal paper detection device. As a result, this device is widely used, and the quality of printed matter is improved.

Further, according to the present invention, a paper feed device, a printing unit, and a paper ejection device are provided, and the paper ejection device is stretched between a sprocket coaxially mounted on a paper ejection cylinder of the printing unit and the paper ejection device. In a sheet-fed rotary printing press that discharges printing paper by a chain of a paper discharging device, a frame of an illicit paper detecting unit is interposed between the printing unit and the paper discharging device, and a double-diameter transfer to this frame is performed. A further discharge cylinder and its sprocket are provided on the frame so as to be adjacent to the double-diameter transfer cylinder on the discharge apparatus side, and the discharge mechanism is disposed between the sprocket and the discharge apparatus. A chain of a paper device is stretched, a transfer cylinder is provided on the frame so as to be adjacent to the double-diameter transfer cylinder on the printing unit side, and a sprocket of the transfer cylinder and a discharge cylinder of the printing unit are provided. sprocket To stretch the conveyor chain during,
By providing a detection device that detects the print density of the printing paper in proximity to the double-diameter transfer cylinder, when the existing printing press is remodeled into a printing press equipped with an unauthorized paper detection device, the existing portion is left as it is. Since it is only necessary to add a transport chain, a transfer cylinder, a double-diameter transfer cylinder, another paper discharge cylinder and a frame, equipment costs can be reduced, and the installation of a fraudulent paper detection device can be facilitated.

Further, according to the present invention, a paper feed device, a printing unit, and a paper ejection device are provided, and the paper ejection device is stretched between a sprocket coaxially mounted on a paper ejection cylinder of the printing unit and the paper ejection device. In a sheet-fed rotary printing press for discharging printing paper by a chain of a paper discharging device, a frame of an unauthorized paper detecting unit is interposed between the printing unit and the paper discharging device, and the frame is made to correspond to the frame. Extend the chain,
A supporting device which is close to the extension of the chain and to which the printing paper is attached is supported by the frame, and a detecting device which detects the printing density of the printing paper in proximity to the chain at a position corresponding to the supporting plate is provided. As a result, when converting an existing printing press to a printing press equipped with an unauthorized paper detection device, it is only necessary to use the existing portion as it is, change the length of the transport chain, and add a frame and a support plate. So
Equipment costs are reduced, and the installation of a fraudulent paper detection device is facilitated.

[Brief description of the drawings]

FIGS. 1 to 3 show an embodiment of a sheet-fed rotary printing press according to the present invention. FIG. 1 is a schematic side view of a multicolor lithographic sheet-fed rotary printing press to which the present invention is applied, and FIGS. Fig. 4 is a schematic side view of a multicolor lithographic sheet-fed rotary printing press showing another embodiment of the invention, and Fig. 4 is a schematic side view of a conventional multicolor lithographic plate-fed rotary printing press. 2 ... paper feeder, 3 ... printing unit, 4 ... paper discharger, 14 ... paper discharge cylinder, 15, 46, 48 ... sprocket, 18 ...
Paper ejection chain, 30,40,50 …… Illegal paper detection unit, 32,4
2,52 …… Frame, 33,43… Double-diameter transfer cylinder, 34,44 …… Transfer cylinder, 35,49,53 …… Detection device, 45 …… Other delivery cylinder, 47…
... Transport chain, 54 ... Support plate.

Claims (3)

(57) [Claims] A paper feed device, a printing unit, and a paper discharge device, wherein a sprocket mounted coaxially with the paper discharge cylinder and a chain of the paper discharge device stretched between the paper discharge device. In a sheet-fed rotary printing press for discharging printing paper, a frame of an unauthorized paper detection unit is interposed between the printing unit and a paper discharging device, and a transfer cylinder having a double diameter is provided on the frame, A transfer cylinder is provided adjacent to the double-diameter transfer cylinder, and the discharge cylinder and its sprocket are provided on the frame on the discharge device side and adjacent to the double-diameter transfer cylinder; A sheet-feeding device, wherein a chain of the paper discharging device is stretched between a sprocket and a paper discharging device, and a detecting device for detecting a printing density of printing paper is provided in proximity to the double-diameter transfer cylinder. Rotary printing press. 2. A paper discharge device comprising a paper feed device, a printing unit, and a paper discharge device, wherein the paper discharge device is stretched between a sprocket that is coaxially mounted on a paper discharge cylinder of the print unit and the paper discharge device. In a sheet-fed rotary printing press that discharges printing paper by a chain of a device, a frame of an unauthorized paper detection unit is interposed between the printing unit and the discharging device, and a double-diameter transfer cylinder is provided on the frame. A further discharge cylinder and its sprocket are provided on the frame so as to be adjacent to the double-diameter transfer cylinder on the discharge device side, and the discharge device of the discharge device is provided between the sprocket and the discharge device. A chain is stretched, a transfer cylinder is provided on the frame so as to be adjacent to the double-diameter transfer cylinder on the printing unit side, and a sprocket of the transfer cylinder and a sprocket of a discharge cylinder of the printing unit are connected to each other. Carry in between And stretching the chain, the multiplying size sheet-fed rotary printing machine, characterized in that a detection device for detecting the printing density of the printed paper in close proximity to the transfer cylinder of the. 3. A paper discharge device comprising a paper feed device, a printing unit, and a paper discharge device, wherein the paper discharge device is stretched between a sprocket coaxially mounted on a paper discharge cylinder of the print unit and the paper discharge device. In a sheet-fed rotary printing press that discharges printing paper by a chain of a device, a frame of an unauthorized paper detection unit is interposed between the printing unit and the paper discharging device, and the chain is extended corresponding to the frame. A detecting device for detecting the print density of the printing paper in proximity to the chain at a position corresponding to the supporting plate, the supporting plate being close to the extended portion of the chain and to which the printing paper is attached; A sheet-fed rotary printing press characterized by having