JPH05280906A - Paper thickness detection device - Google Patents

Abstract

PURPOSE:To cope with change in paper thickness flexibly by combining a sensor lever for detecting paper thickness and a potentiometer and then detecting the paper thickness as an electrical resistance. CONSTITUTION:A paper 1 which is carried through a transport path 2 by a feed roller 3 passes between a bearing 4 for detecting paper thickness and a sensor lever 5 for detecting paper thickness. At this time, since the position of the bearing 4 is fixed, the lever 5 rotates around a support shaft 6 by the amount of paper thickness due to friction. Then, the thickness of the paper 1 is transferred to a potentiometer 7 as a rotary angle by the bearing 4 and the lever 5. thus enabling the meter 7 to detect the paper thickness as electrical resistance. In this case, a curved slide part of the meter 7 helps to convert the paper thickness to electrical resistance accurately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper thickness detecting device, and more particularly to a paper thickness detecting device for detecting the paper thickness of an automatic ticket issuing machine such as a ticket.

[0002]

2. Description of the Related Art In an automatic ticket issuing machine such as a ticket, the thickness of a sheet is detected to detect a double feed and a jam.

Conventionally, an example of detecting the thickness of a sheet in this type of apparatus is performed as follows. Referring to FIG. 2, the sheet 10 is conveyed by the sheet conveying feed roller 12 in the sheet conveying path 11. The position of the bearing 13 is fixed when the paper 10 passes between the bearing 13 for detecting the paper thickness and the sensor lever 14. Therefore, depending on the thickness of the sheet 10, the sensor lever 14 for detecting the sheet
Is pushed, and this force causes the lever 14 to rotate around the support shaft 16. By utilizing this rotation, the rear end of the paper detection sensor lever 14 reacts with the optical sensor 15 when the paper thickness exceeds a certain value.

In one example of this conventional apparatus, it is assumed that the sheet 10 is conveyed in only one direction. After the sheet 10 passes through the sheet thickness detecting sensor lever 14, the lever 17 is returned to its original position by the spring 17 and the spring stopper 18. Further, in this example, the thickness of one type of paper can be detected.

However, since an optical sensor is used to detect the thickness of the paper, it is detected only when the thickness of the paper exceeds a certain level, so that it is possible to cope with the case where the type of paper is changed and the thickness is changed. However, there is a drawback that it is difficult to accurately grasp the thickness of the sheet.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet thickness detecting device capable of flexibly coping with changes in sheet thickness.

[0007]

A sheet thickness detecting device according to the present invention includes a bearing whose position is fixed to detect the thickness of a sheet, and a bearing which is sandwiched between the bearing and a supporting shaft as a center depending on the thickness of the sheet. A lever that rotates and a slide portion that is curved so as to match the radius of rotation of the lever, a potentiometer that converts the rotation angle of the lever into a displacement amount of an electrical resistance value, and does not sandwich the paper in the lever. It is characterized by including a stopper that connects the side end portion and the potentiometer.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will now be described in detail with reference to the drawings.

Referring to FIG. 1, one embodiment of the present invention is
A sheet conveying path 2 for conveying the sheet 1 and a sheet conveying feed roller 3 for sandwiching the sheet 1 from both sides and conveying the sheet 1 in both directions as needed are provided.

The sheet 1 conveyed along the conveying path 2 by the feed roller 3 passes between a sheet thickness detecting bearing 4 and a sheet thickness detecting sensor lever 5. During this passage, since the position of the sheet thickness detecting bearing is fixed, the sheet thickness detecting sensor lever 5 rotates about the support shaft 6 due to the frictional force by the amount of the sheet thickness.

The rear end of the paper thickness detecting sensor lever 5 and the potentiometer 7 are connected by a stopper 8.
The sliding portion of the potentiometer is curved so as to match the turning radius of the sheet thickness detecting sensor lever 5.

The potentiometer 7 converts the rotation angle of the paper thickness detecting sensor lever 5 into a displacement amount of an electric resistance value. That is, the thickness of the paper is the bearing 4 for paper detection.
Is transmitted to the potentiometer 7 as a rotation angle by the sensor lever 5 and the potentiometer 7 detects the thickness of the sheet as an electric resistance value. The curved slide portion of the potentiometer 7 serves to accurately convert the thickness of the paper by the electric resistance value.

After the sheet 1 has passed the sheet thickness detecting sensor lever 5, the support shaft 6 and the sheet thickness detecting sensor lever 5 are provided.
By the connection structure of the spring 9 and the spring 9, the sliding portion of the potentiometer 7 and the paper thickness detecting sensor lever 5 are returned to the original state.

The sheet 1 is conveyed not only in one direction but also in the opposite direction if necessary. In order to deal with this, the sheet thickness detecting portion has a symmetrical structure at right angles to the sheet conveying direction.

[0015]

One of the features of the present invention is that when the thickness of the paper is detected, the thickness of the paper is detected as an electric resistance value by combining the sensor lever for detecting the thickness of the paper and the potentiometer. I have done so. Therefore, it is possible to handle sheets of different thicknesses and different thicknesses, and it is possible to more accurately grasp the thickness of the sheets.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a conventional technique.

[Explanation of symbols]

 1 Paper 2 Paper Conveying Path 3 Paper Conveying Feed Roller 4 Paper Thickness Detecting Bearing 5 Paper Thickness Detecting Sensor Lever 6 Spindle 7 Potentiometer 8 Stopper 9 Spring 10 Paper 11 Paper Conveying Path 12 Paper Conveying Feed Roller 13 Bearing for paper thickness detection 14 Sensor lever for paper thickness detection 15 Optical sensor 16 Spindle 17 Spring 18 Spring stop

Claims (1)

[Claims] 1. A bearing whose position is fixed to detect the thickness of a sheet, a lever which is sandwiched between the bearings and which rotates around a support shaft according to the thickness of the sheet, and a turning radius of the lever. A potentiometer for converting a rotation angle of the lever into a displacement amount of an electric resistance value, and a end portion of the lever on a side not sandwiching a sheet and the potentiometer are connected to each other. A sheet thickness detecting device, comprising: