JPH054665Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention is capable of turning on and off by rotating the actuator.
The present invention relates to a structure for preventing incorrect attachment of an actuator in a photo sensor that is turned off.

<Prior Art> FIG. 3 is a front view of a photo sensor showing an example of a conventional structure for preventing incorrect attachment of an actuator.

As shown in the figure, a pair of bearing parts 22 and 23 are protruded from the upper surface 21a of the main body case 21 so as to face each other. On the other hand, rotation shafts 25 and 26 are formed in the actuator 24 so as to protrude from both side portions 24a and 24b. Then, the rotating shafts 25 and 26 are attached with their tip ends 25a and 26a loosely inserted into the mounting holes 22a and 23a of the bearings 22 and 23, respectively. As a result, the actuator 24 connects the opening/closing portion 24 of the lower part of the actuator 24 to the optical path opening/closing groove 27 provided in the main body case 21.
c is loosely inserted into the main body case 21 so as to be rotatable in a substantially vertical plane.

In the photo sensor, in order to prevent the actuator 24 from being incorrectly attached to the main body case 21 with the left and right sides reversed, the optical path opening/closing groove 27 is
are provided offset from the lateral center of the main body case 21 to either the left or right direction, and correspondingly, both sides 24a, 24 of the actuator 24 are provided.
The lengths of the rotating shafts 25 and 26 of b are changed. That is, the actuator 24 is left and right reversed and the main body case 2 is
Even if an attempt is made to attach the opening/closing part 24c to the first bearing part 22, 23, the opening/closing part 24c cannot be inserted into the optical path opening/closing groove 27.

<Problem that the invention aims to solve> However, with the conventional structure to prevent incorrect attachment as described above,
There was a problem in that the actuator 24 did not rotate smoothly because the left and right balance of the actuator 24 was poor.

<Means for Solving the Problems> The present invention is a structure for preventing incorrect attachment of actuators, which was devised to solve the above problems.

That is, the rotation shafts on both sides of the actuator are formed to have the same length, and an enlarged diameter portion is formed at the base of one of the rotation shafts. Furthermore, a protrusion to prevent incorrect installation is provided on the top surface of the main body case, and by bringing the enlarged diameter part of the actuator into contact with the protrusion to prevent incorrect installation, the rotation axis of the actuator is aligned with the main body case when the actuator is turned left and right. This prevents the bearing from being attached to the bearing.

<Function> In the normal installed state of the actuator,
The expanded diameter part of the rotation shaft does not touch the top surface of the main body case,
Also, the erroneous attachment prevention protrusion on the main body case does not come into contact with the rotating shaft. However, if an attempt is made to attach the actuator to the main body case with the left and right sides reversed, the enlarged diameter portion will come into contact with the erroneous attachment prevention protrusion, making it impossible to attach the rotating shaft of the actuator to the bearing portion of the main body case.

<Example> An example of the present invention will be described below based on the drawings.

FIG. 1 is a front view of a photo sensor provided with the actuator erroneous attachment prevention structure of the present invention, and FIG. 2 is a side view of the same.

As shown in the figure, a pair of bearing portions 3 and 4 are protruded from the upper surface 2a of the main body case 2 of the photo sensor 1 so as to face each other. These bearing parts 3 and 4 have mounting holes 5 and 6 provided with cuts 5a and 6a. Also, on the front side 2b of the main body case 2,
An optical path opening/closing groove 7 is provided from the upper surface 2a to the lower surface 2c. Furthermore, at the rear end of the main body case 2, there is a claw 8 for attaching the photo sensor 1 to various devices.
is formed.

On the other hand, rotation shafts 10 and 11 are integrally formed in the elongated plate-shaped actuator 9 so as to protrude from both side portions 9a and 9b. Further, a horizontal plate-shaped weight 12 is integrally formed at the lower end of the actuator 9 to restore the actuator 9 to its normal position by gravity when the actuator 9 is rotated by an external force.

Then, the end portions 10a, 11a of the rotating shafts 10, 11, each having a reduced diameter, are connected to the bearing portions 3, 4.
It is inserted loosely into the mounting holes 5 and 6 by pushing it through the cuts 5a and 6a. As a result, the actuator 9 is rotatably mounted on the main body case 2 in a substantially vertical plane with the opening/closing portion 9c of the lower part of the actuator 9 loosely inserted into the optical path opening/closing groove 7 of the main body case 2. When the actuator 9 is rotated, the opening/closing portion 9c moves in and out of the optical path opening/closing groove 7, and the photo sensor 1 is turned on and off.

The photo sensor 1 has the following structure in order to prevent the actuator 9 from being incorrectly attached to the main body case 2 with the left and right sides reversed.

That is, both sides 9a and 9b of the actuator 9
The lengths of both rotational shafts 10 and 11 formed in the same structure are made equal. Correspondingly, the optical path opening/closing groove 7 is provided at the center of the front surface 2b of the main body case 2 in the lateral direction.

Further, an enlarged diameter portion 13 having an enlarged diameter is formed at the base portion 11b of one of the two rotating shafts 10 and 11, for example, the right rotating shaft 11. This expanded diameter portion 13 does not come into contact with the upper surface 2a of the main body case 2 when the actuator 9 is normally attached, and therefore does not prevent the actuator 9 from rotating.

Further, on the upper surface 2a of the main body case 2, a protrusion 14 for preventing incorrect attachment is provided below the base 10b of the other rotation shaft 10, that is, the left side. The erroneous attachment prevention protrusion 14 does not come into contact with the rotating shaft 10 when the actuator 9 is normally attached, and therefore does not prevent the actuator 9 from rotating. However, when attempting to attach the actuator 9 to the main body case 2 with the left and right sides reversed, the expanded diameter portion 13 of the rotating shaft 11 comes into contact with the incorrect attachment prevention protrusion 14, and the rotating shafts 10, 11 are attached to the main body case 2. It cannot be attached to the bearing parts 3 and 4 of No. 2. This prevents the actuator 9 from being incorrectly attached.

<Effects of the invention> As described above, the structure for preventing erroneous attachment of the present invention reliably prevents erroneous attachment of the actuator, and furthermore, the rotation shafts on both sides of the actuator are formed with equal lengths. In addition, since the enlarged diameter portion formed on one rotation shaft is formed at the base of the rotation shaft, the left and right balance is good, and the actuator can rotate smoothly.

[Brief explanation of the drawing]

FIG. 1 is a front view of a photo sensor equipped with an actuator mis-installation prevention structure of the present invention, and FIG.
FIG. 3 is a front view of a photo sensor showing an example of a conventional actuator erroneous installation prevention structure.
. . . upper surface, 3, 4... bearing portion, 9... actuator, 9a, 9b... side portion, 10, 11... rotating shaft, 10a, 11a... tip portion, 10b, 11b
...Base, 13...Swelled portion, 14...Protrusion to prevent incorrect installation.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of bearings protruding from the upper surface of the main body case of the photo sensor to face each other, and respective tips of rotation shafts protruding from both sides of the actuator. In the structure that prevents the actuator from being incorrectly installed with the left and right sides reversed when the actuator is installed in the main body case by attaching the They are equally formed, and a swollen diameter portion is formed at the base of one of the rotating shafts, and a erroneous attachment prevention protrusion is provided on the upper surface of the main body case, and the erroneous attachment prevention protrusion is provided with an bulge diameter portion of the actuator. A structure for preventing incorrect attachment of an actuator of a photo sensor, which prevents the rotating shaft from being attached to a bearing portion of the main body case when the actuator is left and right reversed by abutting the actuator.