JP2000292255A - Photoelectric sensor and vibration-type component feeding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photoelectric sensor in which the breakage of an optical fiber is small. SOLUTION: A sensor head 3 is connected to one end of an optical fiber 2, and an amplifier is connected to the other end. A curved surface part 7 whose radius of curvature is larger than the allowable bend radius as the limit of the breakage of the optical fiber 2 is formed on the inner circumference at the end part of a head mounting nut 5b by which the sensor head 3 is attached to a head support member 6. The bend amount of the optical fiber 2 is limited by the curved surface part 7 so as to prevent the optical fiber 2 from being bent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a photoelectric sensor used for detecting the front and back of a minute component, and a vibration-type component supply device using the photoelectric sensor.

[0002]

2. Description of the Related Art In a vibration-type component supply apparatus in which minute components having front and back surfaces such as chip resistors and chip capacitors are arranged and supplied with their front surfaces facing upward, the minute components are arranged in a single row with the front and back surfaces up and down. When a sensor head of a reflection type photoelectric sensor for detecting the front and back of a micro component is provided on a track transferred in a single layer state, and when the photoelectric sensor detects a micro component moving with the back surface facing upward, the sensor of the photoelectric sensor is used. Compressed air is ejected from a nozzle provided in the vicinity of the head to invert the minute parts or to remove the minute parts from the track so as to transfer the minute parts having an upward surface to the downstream side.

A photoelectric sensor for detecting the front and back of a micro component is:
As shown in FIG. 7, a sensor head 21 is connected to one end of an optical fiber 20, an amplifier 22 is provided at the other end, and light from a light emitting element (not shown) provided in the amplifier 22 is irradiated from the sensor head, The reflected light is received by a light receiving element (not shown) provided in the amplifier 22 to detect the front and back of the minute component.

Since the optical fiber 20 for the photoelectric sensor uses a bundle of optical fibers having a small diameter, it is relatively strong against bending. For this reason, when assembling the photoelectric sensor to the vibration-type component supply device, an assembling method in which the optical fiber 20 is not supported and the sensor head 21 and the amplifier 22 can move freely is adopted.

[0005]

In the above-described photoelectric sensor, the optical fiber itself is resistant to bending, but the operator catches the optical fiber during work such as maintenance of the vibration-type component supply device. In this case, there is a disadvantage that the connection portion of the optical fiber 20 to the sensor head 21 or the connection portion to the amplifier 22 is bent at a relatively steep angle, and the optical fiber 20 is easily broken.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a durable photoelectric sensor capable of preventing the occurrence of breakage at a connection portion of an optical fiber to a sensor head or a connection portion to an amplifier, and a use of the photoelectric sensor. To provide a vibration type component supply device.

[0007]

In order to solve the above-mentioned problems, a photoelectric sensor according to the present invention has a sensor head connected to one end of an optical fiber and an amplifier connected to the other end. A configuration is employed in which the bending of the end of the optical fiber is restricted by a protective member having a curved surface having a radius of curvature larger than the allowable bending radius which is the limit of the breakage of the optical fiber.

As described above, since the end of the optical fiber can be prevented from being bent more than the allowable bending by the protection member, the bending occurs at the connection of the optical fiber to the sensor head or the connection to the amplifier. Can be prevented.

Here, the protection member may be a nut for attaching the sensor head to the head support member, or may be a columnar member. When a nut is used as a protective member, a curved surface is provided on the inner periphery of the end covering the connection between the sensor head and the optical fiber of the nut to limit the bending of the connection.

The cylindrical protection member is fixed at a position close to the installation portion of the amplifier, and an optical fiber is provided along the outer periphery thereof to limit the bending of the amplifier connection portion of the optical fiber. In this case, it is preferable that an optical fiber is wound around the outer periphery of the columnar protective member to prevent the amplifier connecting portion of the optical fiber from being bent.

In the vibrating member supply apparatus according to the present invention, the track member to which reciprocating vibration is applied is provided with a linear track on which fine parts are transferred with the front and back surfaces up and down, and the track is provided on the transfer surface of the track. A sensor head of a photoelectric sensor that detects the front and back of a micro component is arranged, and when this photoelectric sensor detects a micro component that moves with its back face upward, it blows compressed air to the micro component and removes it from the track. A nozzle is provided, and the photoelectric sensor of the invention is used as the photoelectric sensor.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a photoelectric sensor 1 includes an optical fiber 2, a sensor head 3 connected to one end of the optical fiber 2, and an amplifier 4 connected to the other end of the optical fiber 2. The optical fiber 2 has an optical fiber for incident light that guides light from a light emitting element provided in the amplifier 4 to the sensor head 3, and receives reflected light input to the sensor head 3 in the amplifier 4. And an optical fiber for reflected light leading to the element.

As shown in FIG. 2, a sensor head 3 has a sleeve 3 for connecting an optical fiber to an end of a lens holder 3a.
The external thread 3c is formed on the outer periphery of the sleeve 3b, and a nut 5a for positioning and a nut 5b for attaching the head are screw-engaged with the external thread 3c.

The sensor head 3 has a sleeve 3b inserted into a hole formed in the head support member 6, and is fixed to the head support member 6 by tightening a head mounting nut 5b.

The rear end of the head mounting nut 5b in the tightening direction is located behind the end of the sleeve 3b to cover the end of the optical fiber 2 on the connection side to the sensor head 3, and has a curved surface on the inner periphery of the rear end. A part 7 is provided.

The radius of curvature R of the curved surface portion 7 is larger than the allowable radius of curvature which is the limit of the breakage of the optical fiber 2. Therefore, when an external force is applied to the optical fiber 2 and the connecting portion of the optical fiber 2 to the sensor head 3 is bent, the amount of bending of the optical fiber 2 is limited by the curved surface portion 7 formed on the nut 5b. Since the amount of bending is larger than the allowable bending radius of the optical fiber 2, it is possible to prevent the optical fiber 2 from being bent from a connection portion to the sensor head 3.

FIG. 3 shows a connection portion between the optical fiber 2 and the amplifier 4. A columnar protective member 8 is provided at a position close to the connection between the optical fiber 2 and the amplifier 4. The protective member 8 is fixedly arranged, and the optical fiber 2 is wound around the outer peripheral cylindrical surface 9 several times. The radius R of the cylindrical surface 9 is larger than an allowable bending radius which is a limit of breakage of the optical fiber 2.

As described above, by winding the optical fiber 2 around the outer periphery of the cylindrical protective member 8 having a fixed arrangement, an external force that deforms the optical fiber 2, for example,
Even if an external force such as pushing down the optical fiber 2 is applied as shown by the arrow in FIG.
The optical fiber 2 is deformed along the outer periphery of the protective member 8, is not propagated to the base 2 a with respect to the amplifier 4, and can prevent the optical fiber 2 from being broken at the connection portion with respect to the amplifier 4.

FIGS. 4 to 6 show a vibration-type component supply apparatus employing the photoelectric sensor 1 having the above-described configuration. The vibratory parts feeder includes a first track member T ₁ to the third track member T ₃ arranged in a straight line, these track member T ₁ to T ₃ is reciprocally longitudinally together It is made to vibrate.

As shown in FIG. 5, the first track member T ₁ has a linear track 11 having a U-shaped cross section on the upper side, and the micropart A is a single-layer single-layer structure with the front and back sides up and down. is in the state transported along the track 11, is sent from the track 11 to the second track member T _2.

The second track member T ₂ has a straight track 12. As shown in FIG. 6, the track 12 has a substantially vertical reference surface 12a, and a transfer surface 12b with an inclination angle for pressing the micro member A against the reference surface 12a.
The reference surface 12a is formed on one side of the first guide member 13, while the transfer surface 12b is formed on the upper side of the second guide member 14.

A head support member 15 is mounted above the first guide member 13, and the head support member 15
The sensor head 3 of the photoelectric sensor 1 shown in FIG. 1 detects the front and back of the micro component A which is transferred along the track 12 by tightening the nut 5b.

The first guide member 13 is provided with a nozzle 16 at a position close to the sensor head 3. The nozzle 16 is provided at a position where compressed air is blown to the minute component A moving along the transfer surface 12b.
Detects a micro component A that moves with its back facing upward, and injects compressed air.

For this reason, the micro component A transported with the back surface facing upward is blown off by the compressed air ejected from the nozzle 16 and is eliminated from the track 12, and the micro component compressed air moving with the front surface facing upward can be blown. without it fed to the third track member T ₃ is transported to the downstream side. Third track member T ₃ has a linear track 17, microcomponents A to the surface upward is transported along the track 17 is aligned fed to the next step.

By employing the photoelectric sensor 1 shown in FIG. 1 in the above-mentioned vibration-type component supply device, an operator can connect the optical fiber 2 of the photoelectric sensor 1 during work such as maintenance of the vibration-type component supply device. Optical fiber 2
Even if an external force is applied to the optical fiber 2, there is no inconvenience that the optical fiber 2 is connected to the sensor head 3 or the optical fiber 2 is connected to the amplifier 4 and the optical fiber 2 is not broken. Can do it.

[0027]

As described above, in the photoelectric sensor according to the present invention, the bending of the end of the optical fiber is limited by the protection member having a radius of curvature larger than the allowable bending radius which is the limit of the breakage of the optical fiber. Therefore, it is possible to prevent the optical fiber from being broken at the connection part to the sensor head or the connection part to the amplifier, and to improve the durability of the optical fiber.

Further, in the vibration-type component supply device according to the present invention, the optical fiber does not break even when an external force which touches the optical fiber and deforms the optical fiber is applied during work such as maintenance. Therefore, work can be performed without paying attention to the optical fiber, and workability can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a photoelectric sensor according to the present invention.

FIG. 2 is a sectional view showing a sensor head of the photoelectric sensor in FIG. 1;

FIG. 3 is a perspective view showing an amplifier section of the photoelectric sensor in FIG. 1;

FIG. 4 is a plan view of a vibration-type component supply device according to the present invention.

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 4;

FIG. 7 is a front view showing a conventional photoelectric sensor.

[Explanation of symbols]

2 Optical Fiber 3 Sensor Head 4 Amplifier 5b Nut 7 Curved Surface 8 Protective Member 9 Cylindrical Surface T ₂ Track Member 12 Track 16 Nozzle

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G065 AA04 AB04 AB22 BA01 BB02 CA11 DA15 DA20 2H038 AA02 AA08 CA34 3F081 AA22 BB05 BC04 BD15 CC18 CD02 CD23 EA09 EA15

Claims (5)

[Claims] In a photoelectric sensor in which a sensor head is connected to one end of an optical fiber and an amplifier is connected to the other end, a protection having a curved surface portion having a radius of curvature larger than an allowable bending radius which is a limit of breakage of the optical fiber. A photoelectric sensor, wherein bending of an end of an optical fiber is restricted by a member. 2. The protection member comprises a head mounting nut for mounting the sensor head to a head support member, and the nut covers the end of the optical fiber on the connection side to the sensor head. The photoelectric sensor according to claim 1, wherein the photoelectric sensor is provided. 3. The photoelectric sensor according to claim 1, wherein the protective member has a cylindrical shape, and the cylindrical protective member is provided at an end of the photoelectric fiber on an amplifier connection side. 4. The photoelectric sensor according to claim 3, wherein an optical fiber is wound around the outer periphery of the cylindrical protection member. 5. A photoelectric sensor for detecting a front and back of a micro component on a transfer surface of a track member to which reciprocating vibration is applied, wherein a linear track on which the micro component is transferred up and down is provided. A sensor head is disposed, and when the photoelectric sensor detects a minute component moving with the back surface facing upward, a nozzle is provided that blows compressed air against the minute component and removes the minute component from the track, and the photoelectric sensor is characterized in that: A vibrating component supply device comprising the photoelectric sensor according to any one of 1 to 4.