JPH0440919Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention includes a first roller equipped with a catching device that catches the edge of a metal cutting plate, and
The present invention relates to an improved technique for a rotary printing press equipped with a second roller for printing on a metal cut plate caught by the roller.

[Conventional technology]

In the above-mentioned rotary printing press, since the printing is often misaligned at the catch position of the metal cut plate caught by the catching device, it is possible that Detects the end face position of the metal cutting plate along the route,
Measures have been taken to correct the attitude of the metal cut plate based on the detected information on the end face position defect.

[The problem that the idea aims to solve]

However, due to reasons such as the metal cutting plate fed into the catching device hitting the device and bouncing back, or the metal cutting plate being insufficiently fed into the catching device, the metal may be cut off at the final stage of the printing process. The catching position of the cutting board is misaligned,
Conventionally, printed metal cut plates are taken out at random to manually inspect for printing misalignment.

However, a large number of skilled engineers are required to carry out the sampling inspection, and because of the sampling inspection, when a defective product is found, all of the metal cutting plates before and after the defective product are inspected again for printing misalignment. It is extremely inefficient,
In particular, when a defective product is found on the user's side, it is common for the product to be returned in lots, which results in a huge amount of wasted costs and leaves room for improvement.

The present invention was devised in view of the above circumstances, and uses extremely rational improved technology to detect catching failures of metal cutting plates that gather around printing misalignment, and remove these defective products from the route. The purpose of this is to eliminate the above-mentioned inconveniences.

[Means to solve the problem]

In order to achieve the above object, the present invention includes an end face position detection sensor that detects the front end face position of a metal cut plate caught by a catching device at at least two locations in the roller axis direction, and an end face position detection sensor that detects the front end face position of a metal cutting plate caught by a An information transmission unit for optically transmitting position detection information is provided on the first roller, and defective product removal is performed to remove defective metal cut plates from the path based on detection information of end face position defects from the sensor. It is characterized by the provision of a device.

[Effect]

According to the above-mentioned characteristic structure, all end face positions of the metal cut plate are detected at the time of entering the final printing process, that is, at the time of catching the metal cut plate by the catching device.

Then, based on the detection information of end face position defects,
Defective metal cutting plates are removed from the route.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings. FIGS. 1 and 2 show a rotary printing press 1;
On the upstream side of the path with respect to the rotary printing press 1, there is a cutting plate feeding machine 3 that feeds out metal cutting plates a such as aluminum or tin plate one by one stacked on a lift 2, and the feeding cutting plates. A conveying device 4 for supplying the printed metal cut plate a to the rotary printing press 1 is disposed, and a conveying device for supplying the printed metal cut plate a to the drying oven 5 is disposed on the downstream side of the path with respect to the rotary printing press 1. 6, and a defective product removal device 7 that removes a defective metal cut plate a with printing misalignment out of the route.

As shown in FIGS. 3 and 4, the rotary printing press 1 is equipped with a first catching device 8 that catches the edge of the metal cutting plate a fed by the conveying device 4. It mainly consists of a roller 11, a second roller 12 that is in contact with the first roller 11 and prints on the metal cut plate a, and an ink roller group 9 that transfers ink to the second roller 12,
Two of the catching devices 8 are provided in the recesses 10 formed in the first roller 11 with a gap between them in the roller axis direction, and the two catching devices 8 are provided in the recesses 10 formed in the first roller 11 with a gap between them in the roller axis direction.
The cut plate a is introduced between the first and second rollers 11 and 12 by catching the end edge of the cut plate a, and is operated at a timing by a cam mechanism 13 to release the catch later. There is.

As shown in FIGS. 1 and 5, the defective product eliminating device 7 has a shaft 14 at both ends that is driven around an axis perpendicular to the direction of transport by the transport device 6.
A pair of left and right arms 15 are provided so as to be relatively rotatable, a shaft 16 is rotatably pivoted across the free ends of the arms 15, and a belt 17 is wound around the large diameter portions of both the shafts 14 and 16. At the same time, one clevis-shaped air cylinder cy of the arm 15
are pivotally connected to each other, so that a first state A is established in which a good metal cut plate a is supplied to the drying oven 5 by contraction of the cylinder cy by switching operation of the control valve V, and a first state A in which a good metal cut plate a is supplied to the drying oven 5 by the expansion of the cylinder cy. Accordingly, a second state B is created in which the defective metal cut plate a with printing misalignment is removed to the stock section 18 outside the route.

Next, based on FIG. 3, the first and second defect detection devices 19 and 20 for detecting a poor catch state of the metal cut plate a caused by printing misalignment will be explained. The first defect detection device 19 is for detecting the position of one left or right side end face of the metal cut plate a caught by the catching device 8. A sensor 21 that detects the end face position by magnetic force is concentrated on the printing press frame and input from the unit 22 to the computer 23. On the other hand, the second defect detection device 20 detects the entire surface of the metal cut plate a caught by the catching device 8, and this also mainly includes a sensor 24 that detects the end face position by magnetic force. Two of the sensors 24 (three or more are possible) are provided in the recess 10 at intervals in the axial direction of the first roller 11, and the end face position is detected from the sensors 24. Information on the first roller 1
An information transmission unit 25 that transmits light from the center of the shaft portion 11a of the first roller 11 is incorporated into the first roller 11, and information from this unit 25 is transmitted to the centralization unit 22.
An information receiving section 26 is provided on the printing press frame side to relay the information to the printing machine frame.In both cases, information is received when the end face position of the metal cut plate a is out of the appropriate range, which may lead to printing misalignment. Then, the computer 23 inputs a signal in the cylinder extension direction to the control valve V, thereby causing the stock section 18 to remove the defective metal cut plate a.

(Effects of the invention) As explained above, the rotary printing press according to the invention is capable of handling all the metal cutting plates to be printed in the final printing process in which the metal cutting plates are caught by the catching device. It detects whether or not the catch condition leads to printing misalignment, and automatically removes any that lead to printing misalignment from the route, and it is possible to detect that there are no defective products among the printed products. I won't.

This eliminates the need for sampling inspection and skilled technicians, which is required in the past, thereby reducing printing costs.

Furthermore, since information is transmitted from the rotating system to the stationary system in the form of optical transmission, accurate information transmission is achieved without malfunctions, compared to, for example, a contact type communication system using brushes.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of a rotary printing press and its ancillary equipment, FIG. 2 is a plan view of the same, FIG. 3 is a plan view of the first roller, and FIG. The sectional view and FIG. 5 are side views of the defective product removal device. a... Metal cutting plate, 7... Defective product removal device, 8...
... Catching device, 11 ... First roller, 12
... Second roller, 24 ... Front end face position detection sensor of metal cutting plate, 25 ... Optical transmission unit.

Claims (1)

[Scope of utility model registration request] A rotary printing machine comprising a first roller equipped with a catching device for catching an edge of a metal cut plate, and a second roller that prints on the metal cut plate caught by the first roller. An end face position detection sensor that detects the front end face position of the metal cut plate caught by the catching device at at least two locations in the direction of the roller axis, and an information transmission unit that optically transmits the end face position detection information from the sensor. , a rotary printing system characterized in that a defective product removal device is provided on the first roller and removes a defective metal cut plate out of the path based on detection information of a defective end face position from the sensor. Machine.