JPS5812083Y2 - Paper sheet thickness detection device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper sheet thickness detection device that uses a contact detector to detect the thickness of filter paper sheets that are conveyed by being sandwiched between belts or the like.

In recent years, devices have been developed and put into practical use that automatically measure the thickness of paper sheets, such as checks and bonds, which are increasing in quantity, and identify whether these sheets are correct or incorrect.

FIGS. 1 and 2 show an example of a sheet thickness detecting device that is generally used to convey sheets using a belt.

The paper sheet 7 is held between belts 2, 2 and conveyed in the direction of arrow A.

The rollers 3, 3, which serve as pedestals, are used to take up the slack of the belt 2, and are also used to provide appropriate tension.

The roller 4, which is a contact detection body, is elastically subjected to a suppressing contact force by a lever 5 against the roller 1, which is a pedestal.

A sheet of paper I, which is held and conveyed by the belt 2.degree. 2, passes between the rollers 1 and 4.

Therefore, the vertical movement of the roller 4 according to the thickness of the passing paper sheet 7 is detected by an optical detection element (not shown) or the like.

The thickness of the paper sheet 7 can be measured.

Such a thickness detection device for paper sheets is disclosed in Japanese Patent Application Laid-Open No. 50-543.
This is publicly known as seen in Japanese Patent No. 96 and the like.

FIG. 3 shows the shape of a conventionally used roller.

The roller 1 is not particularly provided with any steps and has a flush shape in the axial direction, and in this example, the belt 2 holding the sheet γ and the roller 4 are in contact with the surface.

There is no problem in measuring the thickness of paper sheets in the condition shown in Fig. 3, but when used for a long period of time, the rollers 4 on the outer surface of the roller 1 are subject to mechanical wear due to the rollers 4. As shown in FIG. 4, grooves 8, 8 are formed on the roller 1 only at the contact areas.

In this case, while the paper sheet 7 is passing between the rollers 1 and 4, 1
Because the contact between the paper sheet 7 and roller 1 and between the paper sheet 7 and roller 4 is incomplete, the gap between roller 1 and roller 4 does not immediately become the thickness of paper sheet T. Cause.

The present invention was developed in view of the above-mentioned points, and provides a paper sheet thickness detection device that can accurately measure the thickness of paper sheets even if the roller serving as a pedestal is partially worn out. The purpose is to

Hereinafter, the present invention will be explained with reference to an embodiment shown in FIGS. 5 and 6.

As shown in FIG. 5, only the part of the roller surface that is in contact with the roller 4, which is a contact detection body, is a protrusion 9 that is higher than the other parts.
Use the seat roller 1 to form.

With such a structure, even if the part that the roller 4 touches, that is, the protruding part 9, wears out, the contact between the paper sheet T and the roller 4 and the contact between the paper sheet I and the protruding part 9 of the roller 1 is perfect. The gap between the roller 1 and the roller 4 corresponds to the thickness of the paper sheet 7.

Therefore, the vertical movement of the rollers 4 corresponds precisely to the thickness of the paper sheet 7.

As described above, the paper sheet thickness detection device configured as in the present invention reduces thickness measurement errors due to partial wear of the roller as a cradle.

Compared to conventional products, it can withstand long-term use.

Furthermore, there is an advantage that the relative positions of the roller and the contact detection body can be easily determined when assembling the machine or replacing parts.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of a general paper sheet thickness detection device, Fig. 2 is a plan view of the device shown in Fig. 1, Fig. 3 is a side view of a conventional thickness detection device, and Fig. 4 is a FIG. 5 is a partially enlarged side view showing the wear state of the roller shown in the device shown in FIG. 3, FIG. 5 is a partial side view of an embodiment of the present invention, and FIG. It is a partial side view which shows a worn state. DESCRIPTION OF SYMBOLS 1...Roller, 4...Contact detection body, 9...Protrusion part.

Claims (1)

[Scope of utility model registration request] In a device that measures the thickness of paper sheets by sandwiching the paper sheets between a pedestal and a contact detection object facing the pedestal, the part of the pedestal facing the contact detection object is configured to be higher than the other parts. Features: Paper sheet thickness detection device.