JPH0613516Y2 - Photo-interrupter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a photo interrupter in which a light emitting portion and a light receiving portion facing each other are erected on a rectangular parallelepiped case, and particularly, a mounting hole position of a bracket of a copying machine or the like. The present invention relates to a photo interrupter that can be easily determined and can be securely attached to a bracket of a copying machine or the like with one touch.

[Conventional technology]

FIG. 7 is a perspective view of a conventional photo interrupter viewed from the bottom side, FIG. 8 is a perspective view showing the relationship when the photo interrupter shown in FIG. 7 is attached to a bracket of a copying machine, and FIG. It is a photo interrupter side view shown in the figure, 14 is a photo interrupter, 15 is a light emitting part, 16
Is a light receiving part, 17 is a case, 18 is a connector, and 19 to 21.
Is a mounting portion, 22 is a detecting portion, 23 is a bracket, 24
Indicates a locking hole, 25 indicates an engaging hole, P indicates a detection point, D indicates the center line of the detection portion, and L indicates the center line of the case.

The photo interrupter is a combination of a light emitting element and a light receiving element,
For example, it is a composite type photo sensor built in a case made of a synthetic resin such as polycarbonate, and is attached to an appropriate place such as a recording paper conveyance path of an electrophotographic copying machine via a bracket or the like.

That is, the light emitting unit 15 and the light receiving unit 16 have slits 15 _a and 16 _a on the opposing synthetic resin surfaces, and the light output from the light emitting element such as a light emitting diode in the light emitting unit 15 is slit. The light is received by a light receiving element such as a phototransistor in the light receiving unit 16 through 15 _a and the slit 16 _a . Therefore, when an object such as paper passes through the detection unit 22 between the light emitting unit 15 and the light receiving unit 16, the light emitted from the light emitting unit 15 is blocked by the object until the object finishes passing, and the presence of the object is detected. be able to.

Now, the conventional photo interrupter 14 is
It includes a light receiving portion, a case 17 having a built-in amplifier and the like, a connector 18 for taking out an output signal to the outside, and mounting portions 19 to 21 to the bracket 23.
The mounting portions 19 to 21 to the bracket 23 are the seventh and the eighth.
As shown in the figure, a bellows-shaped hook portion 19 integrally formed on one side surface of the case 17 and an engaging protrusion 21 on the other side surface parallel to the side surface are integrally provided, and two bellows-shaped hook portions 19 are formed at right angles to the side surface. The locking protrusions 20 are formed at appropriate positions so as to face each other. On the other hand, as shown in FIG. 8, the bracket 23 is provided with a convex locking hole 24 corresponding to the bellows-shaped hook portion 19 and the locking projection 20 and a rectangular shape corresponding to the engagement projection 21. Engaging holes 25 are formed. Further, in the conventional photo interrupter, the vertical center line D of the detecting portion 22 and the vertical center line L of the case 17 are displaced as shown in FIG.
When drilling, first ,. Determine a detection point P for a passing object such as paper ,. Follow the dimensions of the photo interrupter from the detection point, write the outline on the bracket ,. The procedure is to determine the position of the mounting hole from the outer shape of the photo interrupter.

In order to attach the conventional photo interrupter to the bracket 23 having the mounting holes 24 and 25 thus formed, first, as shown in FIG. 8, the engaging projection 21 is inserted into the engaging hole 25 of the bracket 23. This is performed by a procedure of locking the locking projection 20 and the bellows-shaped hook portion 19 into the locking hole 24 by utilizing the elasticity thereof.

[Problems to be solved by the invention]

However, in the conventional photo interrupter described above, the mounting holes 24 and 25 formed in the bracket 20 are of two types, a convex type and a rectangular type, as shown in FIG. Further, there is a drawback that accuracy is difficult to obtain even in punching and the like. Moreover, as shown in FIG. 9, since the vertical center line D of the detection unit 22 and the vertical center line L of the case 17 are deviated from each other, the process for determining the position of the mounting hole from the detection point must be complicated. I didn't get it.

The present invention solves the above-mentioned problems, and can simplify the step of determining the position of the mounting hole of the photo interrupter, and further, by simplifying the shape of the mounting hole, the accuracy of punching etc. is low. However, it is an object of the present invention to provide a photointerrupter that can be attached with one touch by increasing the attachment accuracy.

[Means for solving problems]

Therefore, the photointerrupter of the present invention is a photointerrupter in which a light emitting part and a light receiving part which face each other are erected on a rectangular parallelepiped case, and a bellows-like hook part and a locking projection part are formed on one side lower part of the case. Together with the
An engaging projection is integrally provided on the lower portion of the other side surface parallel to the side surface to form a mounting portion for a bracket of a copying machine or the like, and the vertical center line of the other side surface orthogonal to the side surface and the light emitting portion. It is characterized in that the vertical center line of the detection unit between the light receiving units is matched.

[Action]

In the photo interrupter of the present invention, when a mounting hole is formed in a bracket of a copying machine or the like, a rectangular hole of the same size with respect to a detection point of a passing object such as paper is formed at symmetrical positions. Well, when attaching it to a bracket of a copying machine or the like, insert the engagement protrusion into one of the corresponding engagement holes, and then elastically attach the bellows-shaped hook portion and the engagement protrusion to the other corresponding engagement hole. You can insert it with one touch. Therefore, as compared with the conventional photo interrupter, the engaging hole formed in the bracket of the copying machine or the like can be easily punched, and the photo interrupter can be mounted with high precision, and the center between the two mounting holes can be attached. Since the line coincides with the vertical center line of the detection unit of the photo interrupter, the center line between the two mounting holes can be used as the detection point, and the process up to determining the mounting hole of the photo interrupter can be simplified. be able to.

〔Example〕

 Embodiments will be described below with reference to the drawings.

FIG. 1 is a perspective view of a first embodiment of a photo interrupter of the present invention when viewed from the bottom side, FIG. 2 is a perspective view showing an example of mounting the photo interrupter, and FIG. 3 is a side view of the photo interrupter. FIGS. 4, 5 and 6 show a second embodiment of the photo interrupter of the present invention. FIG. 4 shows an example of mounting when the bracket has a large thickness, and FIG. 5 shows a case where the bracket has a small thickness. 6 is a side view of the photo interrupter. In the figure, 1 is a photo interrupter, 2 is a light emitting part, 3 is a light receiving part, 4 is a case in which an amplifier or the like is built in, 5 is a connector for taking out an output signal to the outside, 6 is a bellows-like hook part, and 7 is a hook. protrusions for locking, the protrusion for engaging 8, _{8 a} the hook portion, the concave cutout portion, the 10 bracket 9, 11 locking hole, 12 engaging hole 1
3 is the detection unit, P is the detection point, D is the detection unit center line, L
Indicates the center line of the case.

The photo interrupter 1 of the present invention shown in FIGS. 1 to 3 has a light emitting portion 2, a light receiving portion 3 and a connector 5 like the conventional photo interrupter. The light emitting section 2 is formed with a slit 2 _a for emitting light, and the light receiving section 3 is formed with _a slit 3 _a for facing the slit 2 _a and taking in light emitted therefrom. Further, the light emitting portion 2 and the light receiving portion 3 are erected on a case 4 containing an amplifier and the like, and a bellows-like hook portion 6 is extended at a center of a lower portion of one side surface of the case by a length corresponding to the thickness of the bracket. It On both sides of the bellows-shaped hook portion 6, locking protrusions 7 are provided with notches of a certain length. The photo interrupter 1 is integrally molded of a synthetic resin such as polycarbonate, and the bellows hook portion 6 has elasticity. The locking projection 7 engages with the locking hole 11 shown in FIG. 2 to prevent rattling due to the elasticity of the bellows-shaped hook 6. On the lower portion of the other side surface which is parallel to the side surface, an engaging projection 8 is formed by extending a length corresponding to the plate thickness of the bracket. At the end of the engaging projections 8, the hook portions 8 _a is formed, the second
The edge 12 _a of the engaging hole 12 shown in the figure is engaged. Further, as shown in FIG. 3, the photo interrupter of the present invention is arranged so that the longitudinal center line L of the long side of the case and the longitudinal center line D of the detecting portion 13 between the light emitting portion 2 and the light receiving portion 3 coincide with each other. Has been formed.

On the other hand, when a detection point of a passing object such as paper is first determined in the bracket 10 as shown in FIG. 2, rectangular mounting holes are formed symmetrically around the detection point,
The engaging hole 11 and the engaging hole 12 are respectively used. The distance between the edge 11 _{a of the} locking hole 11 and the edge 12 _a of the engaging hole 12 is set equal to the lateral length of the case 4 of the photo interrupter. Edge 12 the length of _a edge 11 _a and the engaging hole 12 of Matakakaritomeana 11 equal to the length of the vertical width of the photo-interrupter of the case 4, said edge ₁₁ a, 12 _a and the other perpendicular The length of the edge may be such that the locking projection 7 and the engagement projection 8 are fitted together, but it is desirable that the edges have the same size in terms of processing work.

The procedure for attaching the photo interrupter of the present invention to the bracket 10 of the main body of a copying machine or the like will be described. As shown in FIG. 2, two rectangular holes 11 and 12 are formed symmetrically with the detection point as the center line. One of them is used as the engaging hole 12, and the engaging projecting portion 8 of the photo interrupter is first inserted, and then the engaging projecting portion 7 is inserted into the locking hole 11 while pushing the bellows-shaped hook portion 6 with a finger using elasticity. It can be easily installed.

Next, a second embodiment will be described with reference to FIGS.

When the bracket 10 of the copying machine has two plate thicknesses, the photo interrupter 4 of the second embodiment can be mounted in either case by simply changing the positions of the mounting holes according to the plate thickness. It was done. That is, the bellows-shaped hook portion 6 in the photo interrupter of the first embodiment,
A concave notch 9 is provided so as to face each other at the center of the lower portions of two side faces that are orthogonal to the side faces on which the locking protrusion 7 and the engagement protrusion 8 are provided. Then, as shown in FIG. 6, the depth from the hooking surface 6 _a of the bellows-shaped hook portion 6 and the hooking surface 8 _b of the hooking portion 8 _a of the engaging projection 8 to the outer edge portion 9 _a of the concave cutout portion 9. Corresponds m ₁ to the thin plate thickness,
Similarly, the depth m ₂ to the bottom surface of the concave cutout portion 9 corresponds to a large plate thickness.

First, when the plate thickness is thin, the engaging hole 11 and the engaging hole 12 are formed in the bracket 10 in a rectangular shape as shown in FIG. Incidentally, the locking hole 11 and the engagement hole 12, the length of their spacing portion 1 ₂ is a size longer than the length 1 ₁ of the bottom surface of the concave cutout portion 9. Then, the engagement protrusion 8 is inserted into the engagement hole 12, and then the bellows-shaped hook portion 6 and the engagement protrusion 7 are inserted into the locking hole 11 by utilizing elasticity.

If the plate is thick, the bracket 1 as shown in FIG.
0 engaging hole 11 and the engaging hole 12 to be formed in the length of their spacing portion, a size shorter than or equal to the length 1 ₁ of the bottom surface of the concave cutout portion 9. Therefore, the gap portion formed by the locking hole 11 and the engagement hole 12 is fitted into the concave cutout portion 9, and the engagement protrusion 8 is inserted into the corresponding engagement hole 12, and then engaged with the bellows hook portion 6. The combined protrusion 7 is inserted into the corresponding locking hole 11 by utilizing elasticity.

In this way, the same photo interrupter can be easily attached to different plate thicknesses only by appropriately opening the mounting holes of the photo interrupter according to the plate thickness of the bracket.

As described above, the photo interrupter of the present invention can be used in case 4
The attachment part of the bellows-shaped hook part and the locking projection part are integrally connected to the lower part of one side surface of the case, and the engaging projection part is integrally provided to the lower part of the other side surface parallel to the side surface. The vertical center line L of the case 4 and the detection unit 1
By aligning the vertical center lines D of 3 with each other, the bracket 1
The position of the mounting hole to be drilled at 0 may be symmetrical from the detection point P. If the detection point of paper or the like is determined on the bracket of the copying machine or the like, the mounting hole position is determined by a simple process. Then, the photo interrupter can be attached to the bracket with a simple procedure.

[Effect of device]

As is clear from the above description, the photointerrupter of the present invention only needs to appropriately form the mounting holes in the bracket of the copying machine symmetrically from the detection point P, so that the paper can be mounted on the bracket of the copying machine or the like. If the detection points such as are determined, the mounting hole position can be determined in a simple process, and the photo interrupter can be attached to the bracket with one touch, so the installation work is greatly simplified compared to the conventional photo interrupter. To be done.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a photo interrupter of the present invention when viewed from the bottom side, FIG. 2 is a perspective view showing an example of mounting the photo interrupter, and FIG. 3 is a side view of the photo interrupter. FIGS. 4, 5 and 6 show a second embodiment of the photo interrupter of the present invention. FIG. 4 shows an example of mounting when the bracket has a large thickness, and FIG. 5 shows a case where the bracket has a small thickness. 6 is a side view of the photo interrupter, FIG. 7 is a perspective view of a conventional photo interrupter viewed from the bottom, and FIG.
FIG. 9 is a perspective view showing the relationship when the photo interrupter shown in the figure is attached to a bracket of a copying machine or the like, and FIG. 9 is a side view of the photo interrupter shown in FIG. 1 ... Photointerrupter, 2 ... Light emitting part, 3 ... Light receiving part, 4 ... Case with built-in amplifier, etc., 5 ... Connector for extracting output signal to the outside, 6 ... Bellows hook part, 7 ... Locking protrusion, 8 ... Engaging protrusion, 8
_a: hooking portion, 9: concave cutout portion, 10: bracket, 11: locking hole, 12: engaging hole, 13: detecting portion, P: detecting point, D: detecting portion center Line, L ……
Case center line.

Claims (2)

[Scope of utility model registration request] 1. A photointerrupter in which a light emitting portion and a light receiving portion facing each other are erected on a rectangular parallelepiped case, and a bellows-shaped hook portion and a locking projection are integrally formed on a lower portion of one side surface of the case. Along with the continuous installation, an engaging protrusion is integrally provided on the lower portion of the other side surface parallel to the side surface to form a mounting portion for a bracket of a copying machine or the like, and a vertical center line of the other side surface orthogonal to the side surface. And a vertical center line of the detection unit between the light emitting unit and the light receiving unit, the photo interrupter. 2. A photointerrupter according to claim 1, wherein concave cutouts are provided facing each other at the center of the lower portions of the two other side surfaces orthogonal to the side surfaces.