JP2517227Y2 - Double-sheet feeding detection device for sheet-fed rotary printing - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a sheet-fed rotary printing machine provided in a sheet-fed rotary printing machine between a sucker device of a sheet feeding device and a feeder board to detect that two printing sheets are erroneously fed at the same time. The present invention relates to a double-sheet insertion detecting device.

[0002]

2. Description of the Related Art In a sheet-fed rotary printing press, a suction port of a sucker device is arranged above a sheet stacked on a sheet stacking plate so as to be movable in a vertical direction and a front-back direction. In front of the sucker device, a tape roller which is driven to rotate by a drive device is extended in the width direction of the paper, and the tape roller supported on the free end of a swingable arm is provided on the peripheral surface thereof. Is pressed and rotating from above. With this configuration, the paper stacked on the paper stack is sucked by the suction port of the vertically moving sucker device, and is conveyed forward by the back and forth movement of the suction port. The conveyed paper is captured by the rotating tape roller and the rotating tape roller in pressure contact with the rotating roller, and is fed to the front feeder board and conveyed, and then supplied to the printing unit.

In such a paper feeding operation, the suction port of the sucker device may erroneously suck two sheets of paper so that they are simultaneously sucked and fed between the tape roller and the tape roller. If you continue to feed paper, not only a lot of waste paper will occur, but it may also lead to an accident.Therefore, there has been conventionally provided a double-sheet insertion detection device for detecting this type of failure, which is generally called double-sheet insertion. Upon detection, the sheet feeding is stopped to eliminate the cause of double-sheet feeding.

As described above, the conventional double-sheet insertion detecting device of this type is provided in the paper feed section consisting of the tape roller and the tape roller pressed against the tape roller from above. When it is generated, the tape roller is raised by the thickness of the paper and the roller arm is swung to close the electric contact.

[0005]

However, in the conventional double-sheet feeding detection device, in order to adjust and check the device, a part of the paper which is actually printed is cut out and used as a tape roller. The quality of the adjustment result was judged by inserting the tape between the rollers and adjusting the gap of the electrical contacts while actually operating the machine to reproduce the defective paper feeding state. Therefore, not only does it take a long time for adjustment, the preparation time is extended and the operation rate of the machine is lowered, but also experience is needed for the adjustment, and the adjustment point is in the central part of the machine. There is a problem that the work is difficult to perform and the burden on the worker increases. Further, since the work is troublesome, adjustment may be neglected, and defective paper feeding continues, resulting in an increase in the occurrence of waste paper and an accident.

The present invention has been made in view of the above points, and provides a two-sheet insertion detecting device for a sheet-fed rotary printing press, which enables adjustment work to be performed easily and reliably in a short time. Is intended.

[0007]

In order to achieve such an object, according to the present invention, a roller arm provided with a tape roller at one free end is pivotally attached to a machine base side, An adjusting member is provided at the other free end of the roller arm so as to be adjustable forward and backward, and an operating pin that is supported so that the adjusting member and the head face each other so as to move forward and backward and that closes the electric contact by moving to the adjusting member side, by moving movably supported provided a setting gauge provided in the outer peripheral portion a plurality of gauge plate of different thicknesses to be inserted selectively through between the head of the adjusting member and the actuating pin.

[0008]

The setting gauge is moved prior to the start of the printing operation, and the gauge plate corresponding to the thickness of the printing paper is selected and inserted between the adjusting member and the operating pin. When the printing operation is started, the paper sucked by the suction port of the sucker is captured by the tape roller and the tape roller and sent to the feeder board. If two sheets are inserted during the printing operation, the tape roller will rise by the thickness of the paper and the roller arm will swing,
Since the electrical contact is closed via the adjustment member and the operating pin,
Feeding is stopped.

[0009]

1 to 8 show an embodiment of a double sheet feeding detecting device of a sheet-fed rotary printing press according to the present invention, and FIG. 1 is a side view of a sheet feeding device of a sheet-fed rotary printing press according to the present invention. Fig. 2, Fig. 2 is a front view of a paper thickness setting gauge, Fig. 3 is a side view thereof, Fig. 4 is a front view of a thick paper gauge plate, Fig. 5 is a same side view, and Fig. 6 is a front view of a thin paper gauge plate. 7 is a side view of the same, and FIG. 8 is an enlarged sectional view of a paper thickness setting gauge mounting portion.

In FIG. 1, a paper feeding device 1 is provided with a tape roller 2 whose both end shafts are rotatably driven by bearings of both side frames and driven to rotate by a driving device, and a support shaft 3 is diagonally above the tape roller 2. Is supported between the left and right frames. A bracket 4 is fixed to a central portion of the support shaft 3 by a knock pin 3a, and an L-shaped roller arm 5 is pivotally attached to a lower end portion of the bracket 4 by a pin 6 so as to be swingable. ing. At the free end of the roller arm 5, a tape roller 7 is pressed against the tape roller 2 by swinging the roller arm 5 by a compression coil spring 8 interposed between the bracket 4 and the roller arm 5, It is configured such that the paper 9 conveyed in the direction indicated by the arrow A in the figure at the suction port of the sucker device is captured by the tape roller 2 and the tape roller 7 and sent out onto a feeder board (not shown).

On the other hand, the operation pin 10 is slidably fitted in the pin hole formed in the protruding portion of the bracket 4, and the screw hole provided in the upper end portion of the roller arm 5 is An adjusting screw 11 with a knob is screwed in with its head facing the head of the actuating pin 10, and a nut 12 for fixing this at the adjusting position is screwed into this adjusting screw 11. A gauge plate of a setting gauge 20 described below is inserted between the head of the adjusting screw 11 and the head of the operating pin 10.

A vertical contact lever 14 is pivotally attached to a pin 13 which is located near the tip of the operating pin 10 and is planted in the bracket 4 so as to be swingable.
Is urged by a tension spring 15 stretched between the pin and the bracket 4 so as to be pressed against the tip of the operating pin 10. Further, an electric contact 16 is provided at the upper end of the contact lever 14, and is configured so that when the contact lever 14 slightly swings clockwise in FIG. 1, the contact is closed to stop the feeding. ing.

On the vertical surface of the bracket 4 located below the operating pin 10, a collar 1 with a collar is shown enlarged in FIG.
7 is fixed with a bolt 18 and a washer 19,
In addition, the setting gauge indicated by reference numeral 20 is the magnet.
The boss 21 made of gauze is fitted into the small diameter portion of the collar 17, is prevented from coming off by the washer 19, and is attracted to the collar 17 by the magnetic force of the boss 21.

The setting gauge 20 shown in an enlarged scale in FIGS. 2 to 8 is provided with the boss 21 formed into an annular shape by the magnet as described above, and the boss 21 is divided into a plurality of parts in the circumferential direction. A plurality of (8 in this embodiment) gauge plates 22 to 29 having different thicknesses are radially fixed by a set screw 30.
Any one of 29 is inserted between the head of the adjusting screw 11 and the head of the operating pin 10. That is, when the paper thickness is changed, the bolt 18 and the adjusting screw 1
The gauge plate 22 of the setting gauge 20 is rotated by rotating the setting gauge 20 against the magnetic force without slackening 1.
Since ~ 29 is inserted between the head of the adjusting screw 11 and the head of the operating pin 10 while slightly swinging the roller arm 5 against the elastic force of the compression coil spring 8, at this time, By selecting any one of the gauge plates 22 to 29 and inserting it between the head of the adjusting screw 11 and the head of the actuating pin 10, the setting gauge 20, and thus the tape roller 7, has various thicknesses. It is configured to be able to handle the detection of.
4 and 5 are a front view and a side view of the gauge plate 26 having the maximum thickness, and FIGS. 6 and 7 are a front view and a side view of the gauge plate 22 having the minimum thickness.

The reference numeral 31 indicates the electrical contact 1 as a whole.
6 is an adjusting device for finely adjusting the gap, and is composed of an adjusting screw 32 with a knob and a nut 33 for fixing the adjusting screw 32 at an adjusting position. The nut 33 is loosened and the adjusting screw 32 is rotationally adjusted. After that, by tightening the nut 33, the gap between the electric contacts 16 is finely adjusted.

The operation of the double-sheet insertion detecting device configured as described above will be described. By rotating the setting gauge 20 against the magnetic force before starting the printing operation, the gauge plates 22 to 29 of the setting gauge 20 cause the roller arm 5 to resist the elastic force of the compression coil spring 8. Since it is inserted between the head of the adjusting screw 11 and the head of the actuating pin 10 while slightly swinging, any one of the gauge plates 22 to 29 is selected at this time so as to correspond to the thickness of the paper. Then adjust screw 11
The setting gauge 20, and thus the tape roller 7, is set so as to correspond to the detection of paper of various thicknesses by inserting it between the head of the device and the head of the operating pin 10.

Incidentally, the adjusting screw 11 is provided with the tape roller 7 as a tape.
A gauge is provided between the head of the adjusting screw 11 and the head of the operating pin 10 in a so-called no-paper state in which no paper is inserted into the pull roller 2.
The adjustment screw 11 is not required to be rotationally adjusted after the initial setting because the rotational adjustment is performed only when the initial setting is performed without inserting the plates 22 to 29 . When the printing operation is started after the preparations are made in this way, the paper 9 sucked one by one by the suction port of the sucker device is captured by the tape roller 2 and the tape roller 7 at the leading edge by the forward movement of the suction port, and is fed out by the rotation thereof to the feeder board After being fed up, it is supplied to the printing unit.

During such a printing operation, when the suction port accidentally sucks two sheets of paper 9 at the same time and sends them into between the tape roller 2 and the tape roller 7, the tape roller 7 is equivalent to one sheet of paper 9. 1, the roller arm 5 slightly rotates clockwise in FIG. 1, and the adjusting screw 11 and the operating pin 10 supported by the free end of the roller arm 5 are integrated with the gauge plate 22 interposed therebetween. Since it moves slightly to the right in FIG. 1, the pulling force of the tension spring 15 causes the contact lever 14 to swing around the pin 13 in the clockwise direction in FIG. As a result, the electrical contact 16 is closed and the feeding is stopped, so that the tape roller 2
One of the two papers 9 inserted between the tape roller 7 and the tape roller 7 is removed, after which the cause of the two-sheet insertion is removed, and then the paper feeding operation is restarted. When the contact lever 14 is swung, the pin 1 which is the fulcrum of rotation of the contact lever 14 is used.
3 to the working point of the actuating pin 10 and the electrical contact 16
By increasing the ratio to the distance to
Since the minute movement of 0 is expanded and transmitted to the electric contact, the electric contact is reliably opened and closed.

In this embodiment, the head of the adjusting screw 11 is formed in the shape of a collar. However, the invention is not limited to this. For example, the head of the adjusting screw 11 may be formed in an arc without a collar, or may be rotatable. You may attach a ball, etc. Further, in the present embodiment, by making the ratio of the distance from the pin 13 which is the fulcrum of rotation of the contact lever 14 to the action point of the actuating pin 10 and the distance to the electric contact 16 large, a small movement of the actuating pin 10 is achieved. Although it is enlarged and transmitted to the electric contact, the present invention is not limited to this, and for example, a sensor that directly detects the movement amount of the operation pin 10 may be provided in the vicinity of the operation pin 10. Further, if the boss 21 of the setting gauge 20 is rotatably supported by the collar 17, it is a magnet.
It does not have to be made of cot . Although the setting gauge 20 is supported by the bracket 4 in this embodiment, it may be supported by the roller arm 5.

[0020]

As is apparent from the above description, according to the present invention, in the double-sheet insertion detecting device of the sheet-fed rotary printing press, the roller arm provided with the tape roller at one free end is provided on the machine base side. and swingably pivoted on this to the other free end portion of the roller arm an adjusting member retractably adjustment, movably provided to face the adjusting member and the head with each other adjustments
An actuating pin to close the electrical contact by the movement of the member, for setting with a plurality of different gage plate thicknesses which is inserted selectively through between the head of the adjustment member and the actuating pin by moving movably supported By providing a gauge and
When the thickness of the printing paper is changed, a simple operation that does not require the use of a tool of selecting a gauge plate with a thickness corresponding to the paper thickness and inserting it between the adjustment member and the operating pin is performed. Since it is possible to respond to the change in thickness reliably and in a short time, the preparation time is shortened and the operation rate of the machine is improved. Further, the adjustment work is easier and requires no skill as compared with the prior art, and the burden on the operator can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a side view of a paper feeding device of a sheet-fed rotary printing press embodying the present invention.

FIG. 2 is a front view of a paper thickness setting gauge.

FIG. 3 is a side view of a paper thickness setting gauge.

FIG. 4 is a front view of a cardboard gauge plate.

FIG. 5 is a side view of a cardboard gauge plate.

FIG. 6 is a front view of a thin paper gauge plate.

FIG. 7 is a side view of a thin paper gauge plate.

FIG. 8 is an enlarged cross-sectional view of a paper thickness setting gauge attachment portion.

[Explanation of symbols]

 2 Tape roller 4 Bracket 5 Roller arm 6 Pin 7 Tape roller 9 Paper 10 Operating pin 11 Adjusting screw 13 Pin 16 Electric contact 20 Contact gauge 22 Gauge plate 23 Gauge plate 24 Gauge plate 25 Gauge plate 26 Gauge plate 27 Gauge plate 28 Gauge plate 29 gauge plate

Claims (1)

(57) [Scope of utility model registration request] 1. A roller arm pivotably attached to a machine base side and provided with a tape roller at one free end portion thereof, and an adjusting portion provided at the other free end portion of the roller arm so as to be adjustable forward and backward.
Wood and the adjustment and actuating pin to close the electrical contact by the movement to this adjusting member and the head with each other are opposed to being movably supported adjusting member, the movement is movably supported
A two-sheet insertion detection device for a sheet-fed rotary printing press, comprising: a setting gauge having a plurality of gauge plates having different thicknesses, which are selectively inserted between the head of the member and the operation pin.