JPS5952134B2 - Double sheet feed detection device in printing press feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A conventional two-sheet feed detection device (two-sheet feed detection device) in a conventional printing press feeder magnifies changes in the thickness of the fed printing material by 5 to 10 times and detects the change in thickness. Since the thickness change is adjusted at the point where the thickness is adjusted, the error is large and adjustment is difficult, and its operation is also uncertain.

This invention is intended to eliminate the above-mentioned drawbacks.

Next, the present invention will be described with reference to illustrated embodiments. An operating roller 5 is rotatably attached to a rotating lever 3 connected via a pin 2 to a main body 1 fixed to a printing press feeder via a pin 4, and a swinging lever 7 is pivotally attached via a pin 6. do.

A counter roller 9 is rotatably attached to the swing lever 7 by a pin 8, and is always pulled downward by a spring 10. A facing member 11 fixed to a rotating lever 3 and an adjusting bolt 12 attached to a main body 1 are made to face each other at a distance equal to the distance a between pins 4 and 2, and are tensioned by a spring 13. Adjust the adjusting bolt 12 first so that the gap between the facing roller 9 and the operating roller 5 becomes extremely small when there is no printing material, and then use the adjusting bolt 12 with the same thickness d as the thickness c of the printing material. It is sandwiched between the opposing member 11.

In this case, the gap between the counter roller 9 and the actuating roller 5 is slightly larger than the thickness c of the printing substrate. The printing material is passed between a feed roller 14 and a counter roller 9. The actuation port 5 is operated by a microswitch 15 provided on the rotary lever 3. When there is only one sheet of printing material between the feed roller 14 and the opposing roller 9, the feed roller 14 Only the opposing roller 9 is rotating due to the rotation of the object 9. When two or more sheets of the printing material 9 are fed in, the opposing roller 9 and the swinging lever 7 are moved upward depending on the thickness of the object 9. The opposing roller 9 contacts the operating roller 5, transmits rotation, and detects that there are two or more printing materials by activating the micro switch 15.In this way, according to the present invention, the printing materials are made to have the same thickness. Since the insertion of two sheets of printing material can be detected by sandwiching the same object, the structure is simple, and the operation is reliable and quick.

[Brief explanation of the drawing]

The drawing is a side view of a two-sheet detection device according to the present invention. 1: Main body, 2: Pin, 3: Rotating lever, 5: Operating roller, 9: Opposing roller, 11: Opposing member, 12: Adjusting bolt, 13: Spring, 14: Feed roller, ] 5: Micro switch, d : Same thickness as the printing material.

Claims (1)

[Claims] 1 In a printing press feeder into which printing materials are inserted one by one, the feeder is fixed to the feeder and has an adjustment bolt 1 at one end.
2 and a pivot pin 2 is provided at a certain distance from the adjustment bolt 12, and a facing member 11 rotatably attached to the pivot pin 2 and corresponding to the adjustment bolt 12 at one end. is provided with a pivot lever 3 which is biased by a spring 13 so that the adjusting bolt 12 and the opposing member 11 are always in contact with each other, and the pivot lever 3 has a microswitch 1 on the upper part of the pivot pin 2.
5. An actuating roller 5 that operates the microswitch at a position opposite to the corresponding member 11 by a certain distance with the pivot pin 2 in between, and the actuating roller In this device, opposed rollers 9 are respectively disposed at positions opposite to the opposed rollers 5, and a feed roller 14 of a printing press feeder is further disposed below the opposed rollers 9, and the adjusting bolt 12 and the opposed member 1
When two or more sheets of printing material are inserted between the opposing roller 9 and the feed roller 14, the opposing roller 9 is placed between the actuating roller 5 and the actuating roller 5. A double-sheet feed detection device in a printing press feeder, characterized in that the microswitch 15 is actuated by contacting and rotating an operating roller.