JPH0452920Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to a cover for a reflective photoelectric switch.
In particular, the present invention relates to a cover for a reflective photoelectric switch that covers the light emitting/receiving surface of a reflective photoelectric switch used in paper sheet processing equipment.

(Prior Art) Fig. 1 is a perspective view showing an example of a feeding section of a general paper sheet processing device, and Fig. 2 is a side view showing an example of a cover for a conventional reflective photoelectric switch used in Fig. 1. 3 is a side sectional view showing an example of how the reflective photoelectric switch cover in FIG. 2 is attached.

In FIG. 1, paper sheets 2 supplied to a supply section 1 are moved by a fork 3 in the direction of arrow 4, and sent out one by one by a suction belt 5 in the direction of arrow 6. Here, in order to improve the accuracy of feeding each paper sheet and perform continuous efficient processing,
The forks 3 need to move the paper sheets 2 seamlessly in front of the suction belt 5, and have fine on/off control so as not to push them too much. In order to perform such control, a reflective photoelectric switch 7 for detecting the amount of paper sheets is provided immediately before the suction belt 5. Further, as shown in FIG. 2, a transparent cover 8 made of acrylic material or the like is attached to cover the light emitting/receiving surface 70 of the reflective photoelectric switch 7. The cover 8 is intended to prevent dust, scraps, etc. generated from the paper sheets 2 from accumulating on the light emitting/receiving surface 70, and the surface of this cover 8 is prevented from accumulating because dust and the like are removed by the movement of the paper sheets. It is installed so that it is at the same level as the surface of the lower supply plate 9, or at a position slightly lower than the surface of the lower supply plate 9.

The cover 8 has a uniform wall thickness, and as shown in FIG. 80 causes a specular reflection phenomenon, and the light receiving section 72 receives this reflected light and is turned on regardless of the presence or absence of the paper sheet 2, which is a problem. In such a state, proper on/off control of Fork 3 is impossible,
There was a drawback that the accuracy of feeding paper sheets was significantly reduced.

(Purpose of the invention) The purpose of the invention is to eliminate the above-mentioned drawbacks by always providing an inclination to the inner bottom surface of the cover, and to create a reflective type that allows the paper sheet processing device feeding section to properly feed paper sheets. The purpose of the present invention is to provide a cover for a photoelectric switch.

(Structure of the invention) According to the invention, in a cover for a reflective photoelectric switch that covers the light emitting/receiving surface of a reflective photoelectric switch used for detecting the amount of paper sheets in a paper sheet processing device, the vertical distance from the light emitting part is A cover for a reflective photoelectric switch is obtained, which has an inner bottom surface that is on the same plane as the light emitting part and is larger than the vertical distance from the light receiving part.

(Example) Next, the present invention will be explained with reference to FIGS. 4 and 5.

4 and 5 are side sectional views showing first and second embodiments of the reflective photoelectric switch cover of the present invention, respectively.

In FIG. 4, the bottom surface of the cover 10 made of transparent acrylic material has a uniform thickness, but the inner bottom surface 100 is the light emitting and receiving surface 7 of the reflective photoelectric switch 7.
It is non-parallel to 0 and tilted at an angle of θ. Here, the angle θ is set to be larger than the inclination angle caused by the way the cover 10 is attached, so that the light reflected by the inner bottom surface 100 of the light emitted from the light emitting section 71 (indicated by the broken line arrow) reaches the light receiving section 72. Therefore, the light receiving section 72 is turned on only when it receives reflected light from the paper sheet 2 (indicated by a solid arrow).

Next, in FIG. 5, the inner bottom surface 20 of the cover 20
0 is non-parallel to the light emitting/receiving surface 70 of the reflective photoelectric switch 7 and is inclined at an angle .theta. as in the first embodiment, but the thickness of the bottom surface is not uniform. It is clear that the second embodiment provides the same effects as the first embodiment.

(Effects of the invention) As is clear from the above explanation, according to the reflective photoelectric switch cover of the present invention, the light reflected by the inner bottom surface of the cover does not reach the light receiving section, so it is suitable for use in paper sheet processing equipment. This produces the effect that paper sheet feeding control can be carried out.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a feeding section of a general paper sheet processing device, Fig. 2 is a side sectional view showing an example of a cover for a conventional reflective photoelectric switch used in Fig. FIG. 3 is a side cross-sectional view showing an example of an attached state of the cover for a reflective photoelectric switch in FIG. 2, and FIGS. 4 and 5 show first and second embodiments of the cover for a reflective photoelectric switch of the present invention, respectively. FIG. In the figure, 1...supply section, 2...paper sheets, 3
...Fork, 4,6...Arrow, 5...Suction belt, 7...Reflective photoelectric switch, 8,1
0,20...Cover, 9...Supply lower plate, 70...
...Light emitting and receiving surface, 71... Light emitting section, 72... Light receiving section,
80, 100, 200...inner bottom surface.

Claims (1)

[Scope of utility model registration request] In a cover for a reflective photoelectric switch that covers the light emitting and receiving surface of a reflective photoelectric switch used for detecting the amount of paper sheets in a paper sheet processing device, the vertical distance from the light emitting section is from the light receiving section on the same surface as the light emitting section. A cover for a reflective photoelectric switch, characterized in that the inner bottom surface is larger than the vertical distance of the switch.