JPH05294510A - Two sheet stopping device for printing press - Google Patents

Abstract

PURPOSE:To carry out adjustment of operation timing of a detector required due to change of printing paper, etc., quickly and without requiring skillfulness. CONSTITUTION:A lever 9 is mounted swingably on a main frame 7 fixed to a feeder A of a printing press, a detection roller 11 is mounted on one end 9a of the lever 9 facing toward a paper sheet feeding roller 3 and a roller 16 is mounted on the other end 9b of it, an adjusting cam 17 for adjusting a clearance between the paper sheet feeding roller 3 and the detection roller 12 is made in contact with the roller 16, and a driving motor 20 and its controller 24 for the adjusting cam 17 are provided to adjust a clearance between the paper sheet feeding roller 3 and the detection roller 12 by controlling the amount of rotation of the driving motor 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-sheet fixing device provided in a feeder of a printing machine.

[0002]

2. Description of the Related Art In a feeder of a sheet-fed printing press, in order to prevent two or more printing sheets from being fed to a printing section,
A two-sheet stop device is provided.

As the above-described two-sheet fixing device, a detection roller is provided so as to face the paper feed roller of the feeder, and when the set number of print sheets are fed at the same time, the detection roller detects the feeding state. There is a mechanical two-sheet stopping device that activates a micro switch to stop feeding.

In this type of two-sheet fixing device, the gap between the paper feed roller and the detection roller, that is, the operation timing of the micro switch is adjusted by an adjusting screw provided between the lever supporting the micro switch and the main body. It is configured to be carried out (Japanese Patent Publication No. 59-52134, Japanese Utility Model Publication No. 3-46810).

[0005]

In the two-sheet fixing device as described above, the operation timing of the microswitch must be adjusted every time the thickness of the printing paper supplied from the feeder is different. Further, the two-sheet fixing device may be fed in a state in which two or more sheets are overlapped with each other depending on the size of printing paper due to the arrangement position thereof, and in that case, the same adjustment must be made. In addition, since the difference in the paper thickness is slight, extremely fine adjustment is required. Performing such fine adjustment with the adjusting screw as described above requires a skill and a lot of adjusting time.

It is an object of the present invention to provide a two-sheet fixing device for a printing machine, which solves the above problems.

[0007]

In order to achieve the above-mentioned object, a two-sheet fixing device for a printing press according to the present invention has a lever swingably attached to a main body frame fixed to a feeder of the printing press. A detection roller is attached to one end of the paper, and a detection roller is attached to the other end, and an adjusting cam for adjusting the gap between the paper feed roller and the detection roller is brought into contact with the roller. And a controller for the drive motor.

[0008]

With the above structure, the adjusting cam is rotated by a predetermined angle by the drive motor controlled by the controller to swing the lever to adjust the gap between the paper feed roller and the detection roller.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view of a two-sheet fixing device of a printing machine to which the present invention is applied, 1 is a side plate of a feeder A of the printing machine, 2 is a stay of the side plate 1, 3 is a paper feed roller, 4,
A feeder board 5 is provided in front of and behind the paper feed roller 3, and the printing paper P is fed by the paper feed roller 3 in the arrow direction.

Reference numeral 7 is a main body frame of the two-piece fixing device B attached to the stay 2 with bolts 8, and 9 is a substantially L-shaped lever attached to the lower portion of the main body frame 7 by a shaft pin 10 so as to be swingable. A first detection roller 11 is attached to one end 9a of the lever 9 so as to face the paper feed roller 3 described above. A second detection roller 12 is provided between the paper feed roller 3 and the first detection roller 11 and is supported by the body frame 7 by a lever 13 so as to be swingable. The print paper P passes between the paper feed roller 3 and the second detection roller 12 described above, and when a predetermined number of print papers P or more simultaneously pass, for example, as shown in FIG.
As shown in FIG. 2, when the two printing papers P and P have passed, the second detection roller 12 swings upward and abuts the first detection roller 11 so that the first detection roller 11 moves counterclockwise in the drawing. Rotate to. With the rotation, the lever 15a of the microswitch 15 is pushed upward by the operating pin 11a provided on the side surface of the first detection roller 11, so that the two-sheet stopping device B is operated.

In order to operate the micro switch 15 when the second detection roller 12 contacts the first detection roller 11 as described above, the gap between the paper feed roller 3 and the second detection roller 12 is set to the printing paper P. It is necessary to adjust it to a value slightly smaller than the paper thickness of the two sheets. That is, it is necessary to adjust the gap g between the first detection roller 11 and the second detection roller 12 in the normal paper feed state shown in FIG. 1 to a value slightly smaller than the paper thickness of one printing paper P.

Therefore, the roller 16 is attached to the other end 9b of the L-shaped lever 9, the adjusting cam 17 is brought into contact with the roller 16 and the adjusting cam 17 is rotated, whereby the above-mentioned gap g is obtained.
That is, the gap between the second detection roller 12 and the paper feed roller 3 is adjusted. 18 is a rotation fulcrum shaft of the adjustment cam 17,
The adjusting cam 17 is supported by the body frame 7 by its shaft 18. Reference numeral 19 is a stopper for positioning the adjusting cam 17 at the zero point.

FIG. 3 is a sectional view taken along the line III--III in FIG. 1 showing the rotating mechanism of the adjusting cam 17, 20 is a drive motor for rotating the adjusting cam 17, and 21 is a mount for the drive motor 20. Is. The drive gear 22 attached to the output shaft 20a of the drive motor 20 is engaged with the driven gear 23 provided on the rotation fulcrum shaft 18 of the adjustment cam 17 to rotate the adjustment cam 17. Reference numeral 24 is an encoder that is a controller of the drive motor 20 attached to the main body frame 7, and the gear 25 provided on the input shaft 24a of the encoder is the driven gear described above.
The rotation angle of the adjustment cam 17 is detected by meshing with 23, and the rotation speed of the drive motor 20 is controlled.

In the above configuration, when the paper thickness of the printing paper P is changed, and when the printing paper size is changed and the detected number is changed, the printing paper size / paper thickness is displayed on the operation panel (not shown). input. The rotation speed of the drive motor 20 is controlled by the input value, and the first detection roller 11 and the second detection roller 12
The gap g between and can be automatically adjusted. That is, the gap between the paper feed roller 3 and the second detection roller 12 can be adjusted. Since the control mechanism for the drive motor 20 and the encoder 24 can be configured by a known technique, description thereof will be omitted.

[0015]

According to the two-sheet fixing device of the printing machine of the present invention, the lever is swingably attached to the main body frame fixed to the feeder of the printing machine as described above, and one end of the lever is opposed to the paper feed roller. The detection roller is attached to the other end, and an adjustment cam for adjusting the gap between the paper feed roller and the detection roller is brought into contact with the roller, and a drive motor for the adjustment cam and a controller for the drive motor are provided. Therefore, no skill is required to adjust the operation timing of the micro switch, and the adjustment time can be shortened compared to the screw adjustment, so that the intended purpose can be achieved well. ..

[Brief description of drawings]

FIG. 1 is a side view of a two-sheet fixing device to which the present invention is applied.

FIG. 2 is a side view of the operating state of FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

[Explanation of symbols]

A Feeder of printing machine B 2 sheet fixing device 3 Paper feed roller 7 Body frame 9 Lever 9a One end 9b Other end 11, 12 Detection roller 16 Roller 17 Adjustment cam 20 Drive motor 24 Controller (encoder)

Claims (1)

[Claims] 1. A lever is swingably attached to a main body frame fixed to a feeder of a printing machine, a detection roller is attached to one end of the lever so as to face a paper feed roller, and a roller is attached to the other end. A two-sheet fixing device for a printing press, wherein an adjusting cam for adjusting a gap between a paper feed roller and a detection roller is brought into contact, and a drive motor for the adjusting cam and a controller for the drive motor are provided.