JPH07301733A - Optical fiber locking device - Google Patents

Abstract

PURPOSE:To obtain an optical fiber locking device capable of simultaneously locking and releasing optical fiber cables of plural channels of an optical fiber type optoelectric sensor. CONSTITUTION:A cable holder 2 which freely attachably and detachably holds the optical fiber cables is provided with fiber mounting holes 2 for four channels and is integrally formed with sectiorial projections 2a, 2a' for changing the diameters of these holes. Next, the cable holder is provided with pressing projections 1d in positions axisymmetrical on both turning side faces of a locking lever 1. This locking lever 1 is freely turnably held by a pin 2e supported in a longitudinal groove 2b. The bores of the fiber mounting holes 2c are reduced and the optical fiber cables are no longer pulled out when the optical fiber cables are inserted into the fiber mounting holes 2c and the locking lever 1 is turned. The number of the locking lever is then reduced and operability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber lock device used in an optical fiber type photoelectric sensor for tightening or releasing an optical fiber cable.

[0002]

2. Description of the Related Art There is a photoelectric sensor provided with a light projecting section for projecting light onto a detection object and a light receiving section for detecting reflected light or transmitted light from the detection object. In such a photoelectric sensor, a part of the light emitting part and the light receiving part is composed of an optical fiber cable, and the optical fiber type photoelectric sensor is connected to the main part of the photoelectric sensor installed at a place distant from the detection object by the optical fiber cable. Is used. In such an optical fiber type photoelectric sensor, an optical fiber lock device for tightening (locking) or releasing (releasing) the optical fiber cable to the photoelectric sensor main body is provided.

The optical fiber lock device is a device for easily locking or releasing an optical fiber cable coated with glass fiber by operating a lever or the like at the connection ends of the light emitting side and the light receiving side. As such an optical fiber lock device, "Cable fixing mechanism" is described in Utility Model No. 1-98441.
Is disclosed.

In this cable fixing mechanism, the light-emitting side and the light-receiving side optical fiber cables are passed through a cap, further passed through an annular band, and then held by a base block. In order to fix the optical fiber cable to the base block, a rotatable lock lever is provided on the annular band, and the optical fiber cable is fastened to the base block by the annular band by rotating the lock lever. The connector of such an optical fiber cable is connected to the case body of the photoelectric sensor to project light to the detection object side, amplify the light from the detection object, and output the detection signal of the object.

In order to process a multi-channel optical signal by providing a plurality of optical fiber type photoelectric sensors as described above, the optical fiber cable connector for each channel and the case body are made thin and adjacent to each other. Must be fixed.

[0006]

However, in such a conventional optical fiber type photoelectric sensor, in the case of a multi-channel type, in order to lock or release the optical fiber cable of each channel, each lock lever is individually provided. Have to operate. Therefore, considering the operability of the lock lever at the installation site, the installation pitch of each optical fiber type photoelectric sensor could not be made too small.

Generally, when the number of channels of the optical fiber type photoelectric sensor is increased, it is required that the case main body including the photoelectric sensor main body also be arranged at a high density. Further, the optical fiber cables including the light emitting side and the light receiving side are often removed or attached together for each channel.
Therefore, it is required to lock and release a large number of optical fiber cables by reducing the number of lock levers as much as possible. Further, when a multi-channel optical fiber cable is provided, an optical fiber locking device capable of easily identifying the locked or released state of each channel from the outside is desired.

The present invention has been made in view of such conventional problems, and an object thereof is to realize an optical fiber locking device capable of easily locking or releasing a multi-channel optical fiber cable with few operations. To do.

[0009]

The invention according to claim 1 of the present application is an optical fiber lock device for detachably holding a light projecting side optical fiber and a light receiving side optical fiber. And a cable holding means for detachably holding a plurality of pairs of optical fiber cables, and a cable tightening means for holding and releasing the plurality of pairs of optical fiber cables with respect to the cable holding means. Engaging means with the cable holding means,
It is characterized by comprising: a light projecting element for outputting light to the light projecting side optical fiber; and a main body case including a light receiving element for photoelectrically converting the light of the light receiving side optical fiber.

According to a second aspect of the present invention, there is provided a cable holder which detachably holds a plurality of pairs of optical fiber cables each composed of a light emitting side optical fiber and a light receiving side optical fiber, and is rotatably held with respect to the cable holder. , A lock lever that tightens and releases the optical fiber cable with respect to the cable holder, a light projecting element that engages with the cable holder and outputs light to the light projecting side optical fiber, and photoelectrically converts light from the light receiving side optical fiber. An optical fiber locking device comprising a main body case including a light receiving element, wherein a cable holder is provided with an optical fiber on a light projecting side and an optical fiber on a light receiving side, and an inner diameter of an insertion port is elastically equal to or larger than an outer diameter of the optical fiber. Multiple sets of deformable fiber mounting holes, and a plurality of sets that are integrally formed in a fan shape on the side surface of the fiber mounting hole and that change the hole diameter of a specific fiber mounting hole by pressing. And a vertical groove that provides a turning space for the lock lever to press two sets of the fan-shaped projections at the same time. The lock lever is located at an axially symmetric position with respect to the center of rotation. And a pair of pressing protrusions formed on both side surfaces, and an arm for rotating the protruding cam to a position where it contacts the fan-shaped protrusion and a position where it does not contact.

According to a third aspect of the present invention, there is provided a cable holder which detachably holds a plurality of pairs of optical fiber cables each composed of a light projecting side and a light receiving side optical fiber, and slidably held with respect to the cable holder. , A holder tightening member for tightening and releasing the optical fiber cable with respect to the cable holder, a light projecting element which engages with the cable holder and outputs light to the light projecting side optical fiber, and a light receiving side optical fiber. An optical fiber locking device comprising: a main body case including a light receiving element for conversion, wherein the cable holder comprises:
Light emitting side and light receiving side optical fibers are inserted, the inner diameter of the insertion port is elastically deformed to more than or less than the outer diameter of the optical fiber, and a plurality of sets of fiber mounting holes are molded integrally with the side surface of the fiber mounting holes, and by pressing A fin-shaped claw that changes the hole diameter of the fiber mounting hole, and a U-shaped claw, one end of which is rotatably held by a part of the cable holder and the other end of which slides with a part of the holder tightening member. The holder tightening member is a lock button that applies a pressing force, and a notch for releasing tightening that is integrally formed with the lock button and that fits with the claw of the cable holder. And a heart-shaped part that is formed on a part of the holder tightening part and that engages with the other end of the pin to move the holder tightening member to the tightening position or the releasing position of the optical fiber cable. Having a cam and And it is characterized in and.

According to the invention of claim 4 of the present application, in the optical fiber lock device, at the connection position of the pair of optical fiber cables on the light-transmitting side and the light-receiving side, the light-transmitting side for each channel and the light-receiving side light corresponding thereto It is characterized in that a display means for displaying a display in which the fibers are associated with each other is provided.

[0013]

According to the invention of claim 1 of the present application having such a feature, when a plurality of optical fiber cables composed of the optical fibers on the light-transmitting side and the optical fiber on the light-receiving side are collectively inserted into the cable holding means, they are detachable. Retained. The cable tightening means is then engaged with the cable holding means to simultaneously tighten the pairs of fiber optic cables. Further, in order to remove the optical fiber cable, the engagement of the cable tightening means may be released. This allows a plurality of fiber optic cables to be locked and released together from the body of the fiber optic photoelectric sensor.

According to the second aspect of the present invention, when a plurality of optical fiber cables are attached to the main body of the optical fiber type photoelectric sensor, each optical fiber cable is inserted into the fiber attachment hole of the cable holder. Next, when the lock lever is rotated, the fan-shaped projection also rotates and rides on the fan-shaped projection formed on the side surface of the fiber mounting hole. Due to the pressing at this time, the diameter of the specific fiber mounting hole is reduced, and the optical fiber cable is tightened. To remove each optical fiber cable from the cable holder, the lock lever is rotated in the opposite direction. At this time, the fan-shaped protrusion rotates to come off the fan-shaped protrusion. When the pressure is released, the diameter of the specific fiber mounting hole is increased, and the optical fiber cable is easily pulled out. This allows multiple fiber optic cables to be locked or released together in the body of the fiber optic photoelectric sensor.

According to the third aspect of the present invention, when a plurality of optical fiber cables are attached to the main body of the optical fiber type photoelectric sensor, each optical fiber cable is inserted into the fiber attachment hole of the cable holder. Next, when the holder tightening member is pressed and slid downward through the lock button, the pin is lowered and the holder tightening member is locked under the cable halter. At this time, the claw formed on the side surface of the fiber mounting hole is pressed inward, the hole diameters of the plurality of fiber mounting holes are simultaneously reduced, and the optical fiber cable is tightened. To remove each optical fiber cable from the cable holder, the holder tightening member is slid in the opposite direction. At this time, the claw of the cable holder is inserted into the notch for releasing the tightening of the holder tightening member. For this reason, the diameters of the plurality of fiber mounting holes are increased, and the optical fiber cable is easily pulled out. This allows a plurality of fiber optic cables to be locked and released together from the body of the fiber optic photoelectric sensor.

Further, according to the invention of claim 4 of the present application, since the display means for displaying the channel of the optical fiber cable for projecting and receiving light is provided at the connection position of the pair of optical fiber cables, the display means for each channel is provided. Fewer optical fiber cable connections.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical fiber lock device in a first embodiment of a photoelectric sensor according to the present invention will be described with reference to FIGS. 1 and 2 are perspective views showing the configuration of the main part of the optical fiber type photoelectric sensor. FIG. 1 (a) shows two lock levers 1 and FIG. 1 (b) shows four channels (c).
The cable holder 2 of h) is shown. 2A shows the cover 3 for four channels, and FIG. 2B shows the main body case 4 for four channels. The lock lever 1 shown in FIG. 1A is rotatably held by a cable holder 2 described later, and locks and releases the cable when two channels of optical fiber cables (not shown) are inserted into the cable holder 2. It is an additional means. The lock lever 1 is a member integrally formed in a T-shape, and has an operating portion 1a for operating with a finger and a columnar protruding cam 1b.

FIG. 3 is a side view of the lock lever 1. As shown in FIGS. 1A and 3, a shaft hole 1c is opened at the center of the projection cam 1b, and a pressing projection 1d is formed on the annular side surface thereof.
Is formed. As shown in FIG. 3, one pair of pressing protrusions 1d are formed at positions symmetrical with respect to the shaft hole 1c, and one pair is provided on each of the left and right side surfaces. The pressing protrusion 1d has a conical shape, and is in contact with a later-described fan-shaped protrusion 2a formed on the cable holder 2 and seen from the protrusion cam 1b.
To transform the outside.

Next, the cable holder 2 will be described.
4A is a front view of the cable holder 2, and FIG.
FIG. 4 is a sectional view taken along line XX of FIG. See also FIG.
(C) is sectional drawing in the YY line of (a). The cable holder 2 is a cable holding means that fits with the main body case 4 while holding the optical fiber cable, and in this embodiment, eight fiber mounting holes 2c for four channels are formed. For example, the fiber mounting hole 2c on the upper side is a mounting hole for the optical fiber cable on the light receiving side, and the lower side is a mounting hole on the light emitting side. As shown in FIG. 4, the fiber mounting hole 2c is provided with a flexible portion 2g, which is notched in an arc shape so as to match the outer peripheral surface of the optical fiber cable, on one side. It works by holding the optical fiber cable from the left and right. Fiber mounting hole 2
The inner diameter of c is slightly larger than the coated outer shape of the optical fiber cable in the released state and smaller than that in the locked state.

A vertical groove 2b is provided at the center of the fiber mounting holes for the left and right two channels of the cable holder 2. Then, on the side of the vertical groove 2b, fan-shaped projections 2a and 2a 'are formed on the side surface of the flexible portion 2g. 1 (b)
As shown in FIG. 3, a pin hole 2d is formed so as to penetrate the cable holder 2 in the horizontal direction. And FIG. 4 (b),
As shown in (c), the fan-shaped protrusions 2a and 2a 'are fan-shaped protrusions with the pin hole 2d as an axis of symmetry. The fan-shaped projection 2a shown in FIG. 4 (b) is centered on the line ZZ,
For example, 15 ° in the clockwise direction (CW), counterclockwise (C
It is a fan-shaped protrusion that opens at 60 ° in the (CW) direction. See also FIG.
The fan-shaped protrusion 2a 'shown in (c) is CW centered on the line ZZ.
It is a fan-shaped projection that opens 15 ° in the direction and 90 ° in the CCW direction.

As shown in FIG. 1B, a plurality of claws 2f are integrally formed on the upper and lower portions of the rear surface of the cable holder 2 and are engaged with the main body case 4. To assemble the cable holder 2 configured in this way, the pin 2e is inserted into the pin hole 2d. Next, each lock lever 1 is inserted into the vertical groove 2b of the cable holder 2, and the slit 1e shown in FIG.
The protrusion cam 1b is attached to the pin 2e so as to be rotatable.

The body case 4 shown in FIG. 2 (b) includes a photoelectric sensor body of an optical fiber type photoelectric sensor, and a box-shaped housing 4a is provided on the front surface thereof. The housing 4a is fitted with the cable holder 2 to input and output the light of each optical fiber cable to the main body case 4. Further, the cover 3 shown in FIG. 2A engages with the claw 4b of the main body case 4 and serves to cover the cable holder 2 in a state where the optical fiber cable is connected.

The operation of the optical fiber lock device of the first embodiment constructed as above will be described. Figure 5 (a)
Is the protruding cam 1b of the lock lever 1 and the cable holder 2
It is explanatory drawing which shows the positional relationship of the fan-shaped protrusions 2a and 2a 'formed in FIG. Further, FIG. 5B is an explanatory diagram showing a locked and released state of the optical fiber cable in the cable holder 2, and A to D show the position of the lock lever 1. FIG. 3 shows the position of the lock lever 1, and the illustrated state shows the position B.

In order to fix the optical fiber cable to the cable holder 2, first, a predetermined number of channels (here, four channels), that is, eight optical fiber cables are covered by the cover 3.
Through the fiber insertion port 3a, and is inserted into the eight fiber attachment holes 2c of the cable holder 2. At this time, since the inner diameter of the fiber mounting hole 2c must be larger than the outer diameter of the optical fiber cable, the lock lever 1 is released. When the lock lever 1 is rotated to the position D shown in FIG. 3, the pressing protrusion 1d of the lock lever 1 is not brought into contact with the fan-shaped protrusions 2a and 2a 'as shown in FIG. 5 (a). Therefore, the upper and lower flexible portions 2g of the cable holder 2
Does not deform, and the optical fiber cable can be easily inserted into the fiber mounting hole 2c.

Next, in order to lock all the optical fiber cables, the pressing protrusion 1d of the lock lever 1 is rotated to the position B shown in FIG. 5 (a). In this state, the respective pressing protrusions 1d provided on both annular surfaces of the lock lever 1
Rides on the fan-shaped projections 2a ', 2a and elastically deforms the upper and lower flexible portions 2g of the cable holder 2. For this reason, the inner diameter of the fiber mounting hole 2c becomes small, and the end portion of each optical fiber cable is strongly fixed.

In this state, the cable holder 2 shown in FIG. 1 (a) is fitted into the main body case 4 shown in FIG. 2 (b).
In this way, the optical fiber cable of each channel and the photoelectric sensor main body portion in the main body case 4 are coupled, and the optical fiber type photoelectric sensor can be operated.

Next, the operation of removing the optical fiber cable of the specific channel will be described. As shown in FIG. 5B, for example, when the optical fiber cable of ch2 is removed while the channel (ch) 1 is locked, the lock lever 1 is rotated to the position A shown in FIGS. 3 and 5A. . In this state, the ch1 pressing projection 1d remains on the fan-shaped projection 2a, but is disengaged from the ch2 fan-shaped projection 2a '. Therefore, the flexible portion 2g of the ch2 does not elastically deform, and the inner diameter of the fiber mounting hole 2c becomes large. If the optical fiber cable of ch2 is pulled out in this state, it can be easily removed from the cable holder 2. Similarly, when the lock lever 1 is rotated to the position indicated by C in FIGS. 3 and 5A, ch1 is released and ch2 is locked.

By rotating the lock lever 1 to a predetermined position as described above, the optical fiber cables of the two channels can be locked or released independently. If the color of the resin forming the lock lever 1 is changed to the color of the resin forming the cover 3 and the main body case 4, the rotation state of the lock lever 1 can be easily identified from the outside, and the light of each channel can be detected. The locked state of the fiber cable can be easily recognized. Further, as shown in FIG. 1A, in the lock lever 1, since the rotation arm length between the operation portion 1a and the projection cam 1b is sufficiently secured, the operation force for locking the optical fiber cable can be small. .

Although the optical fiber type photoelectric sensor of FIGS. 1 to 5 shows the case of four channels, a larger number of optical fiber cables are included in one set of the cable holder 2, the cover 3 and the main body case 4. It is also possible to form a long horizontal direction. Further, if the operating portion 1a of the lock lever 1 is determined in height so as not to be exposed from the upper surface of the body case 4 in the locked state, the lock lever 1 is released even if the body case 4 is inadvertently touched. It will not be lost.

Next, an optical fiber lock device according to the second embodiment of the present invention will be described with reference to FIGS. 6 and 7 are exploded perspective views showing the configuration of the main part of the optical fiber type photoelectric sensor 10 including the optical fiber locking device of the second embodiment. Optical fiber type photoelectric sensor 10
Is a holder tightening member 11 shown in FIG. 6A, and FIG.
The cable holder 12 shown in FIG. 7 and the cover 1 shown in FIG.
3, It comprises including the main body case 14 shown in FIG.7 (b).

The holder tightening member 11 shown in FIG.
Cable clamping means for disposing a plurality of optical fiber cables (not shown) by engaging the cable holders 12 with each other. The cable holder 12 of FIG. 6B is a cable holding means for locking the optical fiber cable and coupling it to the photoelectric sensor main body of the main body case. The cover 13 in FIG. 7A is a holder tightening member 1.
1 and the cable holder 12 are coupled to the main body case 14, the holder tightening member 11 together with the optical fiber cable.
And a cover that covers the cable holder 12. Figure 7 (b)
The main body case 14 includes a light emitting element and a light receiving element, and has a photoelectric sensor main body that photoelectrically converts detected light to process a signal.

The holder tightening member 11 will be described with reference to FIG. 6 (a) and FIGS. 8 is a front view of the holder tightening member 11 as viewed from the mounting direction of the cover 13, FIG. 9 is a cross-sectional view taken along the line EE of FIG. 8, and FIG. 10 is a holder tightening member 11 as viewed from the mounting surface of the body case 14. FIG.

The holder tightening member 11 is composed of a lock button 11a pressed by a finger or the like, and a holder tightening portion 11b slidably engaged with the cable holder 12. As shown in FIGS. 8 to 10, the lock button 11a is formed by cutting one side surface of a hollow prismatic member, and integrally forming a flat plate portion 11c for pressing with a finger on the upper surface thereof. On the other hand, the holder fastening portion 11b is resin-molded in a box shape or a frame shape, and has four elongated holes 11d on the side surface (front portion in FIGS. 8 and 10) having the largest area and a heart-shaped cam in the center portion. 15
Are integrally formed. As shown in FIGS. 8 and 10, the elongated hole 11d is an elongated hole for escape from the optical fiber cable when the holder tightening member 11 is moved up and down with the optical fiber cable locked to the cable holder 12. .

FIG. 11A shows the lock button 11a of FIG.
11B is a cross-sectional view taken along line FF, and FIG. 11B is a top view of the lock button 11a. A spring holding portion 11e is formed inside the lock button 11a. The spring holding portion 11e is a cavity for holding a coil spring 17, which will be described later. As shown in FIG. 11B, the flat plate portion 11c is a pressing surface against which the elasticity of the coil spring 17 is pressed by a finger.

As shown in FIGS. 9 and 10, the holder tightening portion 1
1b, a rectangular protrusion 1 is formed on the back surface of the heart-shaped cam 15.
1f is formed. The rectangular protrusion 11f is a reinforcing portion for preventing the heart-shaped cam 15 from being elastically deformed to the back surface because the heart-shaped cam 15 receives a large pressing force due to the sliding force of the pin 16 described later. As shown in the cross-sectional view of FIG. 9, the end face of the rectangular protrusion 11f is the same as the end face of the outer peripheral frame of the holder fastening portion 11b, and the square protrusion 11f has four ends inside.
Two recesses are formed. This recess is a square protrusion 11f
The weight of the holder tightening portion 11b is reduced while the rigidity of the holder is maintained.

Next, the heart-shaped cam 15 will be described.
12A is a plan view showing the configuration of the heart-shaped cam 15, and FIG. 12B is a sectional view showing the shape of the sliding surface of the heart-shaped cam 15. FIG. 17 is a partial cross-sectional view showing the relationship between the heart-shaped cam 15 and the pin 16 engaging with it. Figure 8
Further, as shown in FIG. 12A, the heart-shaped cam 15 has a cam groove 15a for the lower end of the pin 16 to follow, which is formed on the outer peripheral portion of the central heart-shaped projection 15b. The depth and width of the cam groove 15a vary depending on the location as shown in FIG. 12 (b), and in principle, the lower end of the pin 16 has grooves (a), (b), (c) ... Sliding in the order of (g). At the first stable point shown by the groove (f) in FIG. 12A, the groove depth is the deepest and the bottom surface is not inclined. A groove (g) following the groove (f) has an arc-shaped planar shape, and the groove gradually becomes shallower and slopes upward as it goes downward along the side surface of the heart-shaped projection 15b.

The groove (g) is connected to the groove (a) through a descending step indicated by G1. The step G1 regulates the sliding direction of the lower end of the pin 16 that slides in the cam groove 15a, and prevents the pin 16 once retained in the groove (a) from moving backward in the groove (g). The bottom surface of the groove (a) is not inclined, and the groove (b) having a rising slope is formed on the right outer peripheral portion of the heart-shaped projection 15b. A groove (c) having the smallest groove depth is formed at the right corner of the heart-shaped projection 15b, and then a groove (d) is formed through the descending step G2. The bottom surface of the groove (d) is not inclined, and a retreat portion is formed above it. Further, a groove (e) is formed through the descending step G3, and the bottom surface thereof is not inclined. Also on the side of the heart-shaped projection 15b of the groove (e), there is formed a retreat portion which is cut out in an arc shape on the lower side. This retreat is the second stable point where the pin 16 stops. The groove (e) is connected to the above-mentioned groove (f) via the descending step G4. The groove (f) also has a retreat part above it. When the pin 16 urged by the coil spring 17 moves up and down (alternate operation), the groove (d) and the retreat part of the groove (f) have a back stroke (play in the pressing direction) of the lock button 11a that has been once pressed. Is an engaging groove for securing the.

Now, as shown in FIG. 10, the holder tightening portion 11
A notch 11g for releasing the tightening is formed on the inner surface of the outer peripheral frame of b. The notch 11g for releasing the tightening is a wedge-shaped notch, and is provided inside the left and right side surfaces at two positions, one above the other. Next, the pin 16 shown in FIGS.
A U-shaped metal pin, one end of which is engaged with a pin holder 12a provided in the cable holder 12 described later, and the bottom end of which is engaged with the cam groove 15a of the heart-shaped cam 15. I am fit. The lower end surface of the pin 16 is formed with a flat cut surface so as to smoothly slide with the sliding surface of the cam groove 15a.

Next, the cable holder 12 is shown in FIGS.
This will be described with reference to FIG. FIG. 13 is a front view of the one cable holder 12 seen from the direction of the holder fastening member 11,
FIG. 14 is a side view thereof, and FIG. 15 is a rear view of the cable holder 12 viewed from the body case 14 side. As shown in FIG. 6B, the cable holder 12 is integrally formed for four channels or two channels.

FIG. 16 (a) is a sectional view of the cable holder 12 shown in FIG. 13 taken along the lines K1 to K4.
6B is a top view of the cable holder 12. Figure 6
As shown in (b) and FIG. 13, the cable holder 12 is formed by integrally forming a plurality of fiber mounting holes 12c and a pin holder 12a, and here, the fiber mounting holes 12c for two channels are provided. Similar to the case of the first embodiment, the cable holder 12 is fitted in the main body case 14 while holding the optical fiber cable, and the upper fiber mounting hole 12c is a mounting hole of the light receiving side optical fiber cable, The lower side is a mounting hole on the light emitting side.

As shown in FIG. 13, the cable holder 12 has an inverted U-shaped protrusion having a vertical groove 12b formed in the base, and the upper and lower fiber mounting holes 12c of each channel are divided into left and right sides. It is open to. Each fiber mounting hole 12c has a flexible portion 12d, which is partially cut in an arc shape so as to match the outer peripheral surface of the optical fiber cable. The flexible portion 12d is resin-molded on the outside when viewed from the vertical groove 12b. A fin 12e protruding like a fin is formed at the lower end of each flexible portion 12d. Nail 1
2e indicates that when the holder tightening member 11 moves downward, the flexible portion 12g holding the optical fiber cable is locked, or when the holder tightening member 11 moves upward.
The flexible portion 12g is brought into a released state by fitting with the notch 11g for releasing the tightening.

The vertical groove 12b is fitted with the rectangular protrusion 11f shown in FIG. 9 or 10, and constitutes a guide groove for the holder tightening member 11 to slide vertically. 13 and 16
The pin holder 12a shown in (b) is a cable holder 12
It is a cylindrical member provided on the upper end of the protrusion formed in the inverted U shape. A pin hole 12f is opened on the side surface of the cylinder, and holds the bent portion of the upper end of the pin 16 as shown in FIG. In addition, FIGS. 14, 15, 16A, and 16B
As shown in FIG. 2, two claws 12 g are formed on the side surface of the cable holder 12 and are configured to engage and lock with the main body case 14.

Next, the cover 13 shown in FIG. 7 (a) is provided with four channels of fiber insertion ports 13a through which the optical fiber cables of each channel are inserted. Also cover 1
The lock button 11a of the holder tightening member 11 is provided on the upper surface of
There are two cutouts 13b for inserting the. The cover 13 functions to shield the two sets of cable holders 12 engaged with the holder tightening member 11 by fitting with the body case 14.

On the other hand, the main body case 14 shown in FIG. 7B includes the photoelectric sensor main body of the optical fiber type photoelectric sensor 10. Two engaging holes 1 are provided on the front surface of the body case 14.
4a is formed and fits with the cable guide portion 12h formed on the back surface of the cable holder 12 shown in FIG.

In order to assemble the optical fiber type photoelectric sensor 10 having the above components, the coil spring 17 as shown in FIG. 6A is first stored in the spring holding portion 11e of the holder fastening member 11. Next, as shown in FIG. 17, the upper end of the pin 16 is attached to the pin hole 12 of the pin holder 12a.
It is inserted in f and is held inside the coil spring 17 so as not to fall from this hole. In this state, holder tightening member 1
1 is inserted from above the cable holder 12, and the lower end of the pin 16 is inserted into one of the grooves (a) to (f) of the cam groove 15 a of the heart-shaped cam 15. When the holder tightening portion 11b shown in FIGS. 8 and 10 is pushed down to the lower side of the cable holder 12, the flexible portion 12d of the cable holder 12 elastically deforms inward, and the holder tightening portion 11b moves further downward. Slide. Eventually, the claw 12e becomes the notch 1 for releasing the tightening shown in FIG.
1g, holder tightening member 11b and cable holder 1
2 is elastically coupled via the coil spring 17. Next, the holder tightening member 11 and the cable holder 1
The combined body of 2 is attached through the engagement hole 14a of the main body case 14, and the cover 13 is further attached.

In the optical fiber lock device of the second embodiment assembled as described above, an operation of inserting an optical fiber cable (not shown) and locking or releasing the cable will be described mainly with reference to FIGS. 18 and 19. To do. First, when the lock button 11a is pressed downward, the holder tightening member 11 moves downward against the elastic force of the coil spring 17. As shown in FIG. 17, the upper end of the pin 16 is inserted into the pin holder 12a and therefore does not move vertically. Further, the lower end of the pin 16 is rotatable about the upper end as a center of rotation while sliding in the cam groove 15a. Therefore, when the holder tightening member 11 moves downward, the pin 1
The lower end of 6 tends to move upward relative to the heart-shaped cam 15.

If the lower end of the pin 16 is initially in the groove (a) as shown in FIG. 12 (a), it will try to move upward along the side surface of the heart-shaped projection 15b. Since a rising step G1 is formed in the groove (a) as viewed from the left side of the groove,
The lower end of the pin 16 cannot move to the groove (g) and slides upward along the slope of the groove (b). In this way, the lower end of the pin 16 moves upward along the grooves (a), (b), and (c), and eventually falls into the groove (d). In this state, the holder tightening member 11
When the pressing force of the lock button 11a is released, the lower end of the pin 16 tries to move downward again due to the restoring force of the coil spring 17. However, due to the step G2 in the groove (d), the pin 16 cannot move to the groove (c) side and is moored in a state of being in contact with the lower retracted portion in the groove (e). FIG. 19 shows this state, where (a) is a side view showing an engaged state of the holder tightening member 11 and the cable holder 12, and (b) is a longitudinal sectional view thereof.

To insert and lock the optical fiber cable, the lock button 11a of the holder tightening member 11 is pressed again. At this time, the lower end of the pin 16 has a cam groove 15a.
However, since there is a rising step G3 with respect to the groove (d), it cannot move in this direction and moves to the groove (f) via the falling step G4. When the pressing force of the lock button 11a is once released in this state, the holder fastening member 11b including the heart-shaped cam 15 moves upward. This causes the lower end of the pin 16 to move to the lowest end of the cam groove 15a via the groove (g). This state is shown in FIGS. 18 (a) and 18 (b). Here, the lower end of the pin 16 is anchored in the groove (a), and the holder tightening member 11 is located at the uppermost position with respect to the cable holder 12. At this time, the claw 12e of the flexible portion 12d is fitted in the notch 11g for releasing the fastening shown in FIG. At this time
As shown in FIG. 8 (b), the inner diameter of the fiber mounting hole 12c becomes larger than the outer coating diameter of the optical fiber cable, and
The optical fiber cable can be inserted through the third fiber insertion port 13a.

In this way, the optical fiber cable of the required channel is inserted into the fiber mounting hole 12c.
After inserting the optical fiber cables until the connecting end faces of the optical fiber cables reach the end faces of the light projecting element and the light receiving element provided in the main body case 14, the lock button 11a of the holder fastening member 11 is pressed again. At this time, as in the case described above, the lower end of the pin 16 is formed from the groove (a) to the grooves (b) and (c) shown in FIG.
Via, move into the groove (d). Since the claw 12e of the flexible portion 12d shown in FIG. 13 relatively slides along the inner surface of the outer peripheral frame of the holder fastening portion 11b shown in FIG. 10, the flexible portion 12d is forcibly bent inward. . Therefore, as shown in FIG. 19, the inner diameter of the fiber mounting hole 12c becomes smaller than the outer diameter of the optical fiber cable, and the optical fiber cable is completely locked.

After the optical fiber cable is locked, even if the pressing force of the lock button 11a is released, the lower end of the pin 16 remains moored in the recess (recess) of the groove (e) shown in FIG.
It will be pressed downward. In this state, the lower end of the pin 16 cannot move to the left or right of the cam groove 15a as well as downward. In this way, the lock of the optical fiber cable is stably held. FIG. 19 (a),
As shown in (b), the optical fiber cables are locked for two channels at a time, and the four optical fiber cables can be locked and released simultaneously by operating one lock button 11a. .

As shown in FIG. 10, the holder tightening member 11e
The tightening release notch 11g is formed symmetrically with respect to the rectangular protrusion 11f that serves as the central sliding shaft. Further, as shown in FIG. 13, also in the cable holder 12, the flexible portion 12d of each channel is formed symmetrically with respect to the rectangular protrusion 11f. Therefore, there is an advantage that the tightening force of the optical fiber cable between the left and right can be made uniform regardless of the processing accuracy of the holder tightening member 11 and the cable holder 12.
Further, when the holder tightening member 11 is operated in an alternate manner, the lower end of the pin 16 swings to the left and right when viewed from the stationary system. However, as shown in FIG. 17, the corners of the pin 16 are inside the outer peripheral end of the coil spring 17. Is held on pin 16
The whole does not float up from the cam groove 15a of the heart-shaped cam 15. Although there is a conventional alternate mechanism that performs such a snap hit operation, a leaf spring or the like is attached to the back surface of the pin in order to prevent the pin from rising from the cam groove. In this embodiment, since the fulcrum side of the pin 16 is held by the inner surface of the coil spring 17, such a leaf spring member is unnecessary.

In this embodiment, the heart-shaped cam 15 is provided at the center of the outer peripheral frame of the holder tightening member 11, but it may be provided on the side surface of the outer peripheral frame when the number of optical fiber cable clamps is small. It is also possible to make the holder tightening member 11 and the cable holder 12 long in the sliding direction so as to be able to hold an optical fiber cable having four or more channels. Further, the holder tightening member 11 and the cable holder 12 can be made longer in the vertical direction to lock or release the optical fiber cables of two or more channels at the same time.

Next, an optical fiber lock device according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 20 is an external view showing the configuration of an optical fiber type photoelectric sensor 20 including the optical fiber locking device of this embodiment. 20A is a side view of the optical fiber photoelectric sensor 20, FIG. 20B is a top view thereof, FIG. 20C is a front view of a portion including a holder tightening member and a cable holder, and FIG. (E) is a rear view of the main body case.

In the optical fiber type photoelectric sensors of the above-mentioned first and second embodiments, as an operation portion for locking or releasing the optical fiber cables of a plurality of channels,
A lock lever 1 or a lock button 11a is provided. For this reason, the mounting pitch of the operating portion is reduced. On the other hand, in the optical fiber type photoelectric sensor in which the operation unit is provided for each channel, when the number of channels of the optical fiber cable increases and the arrangement pitch becomes smaller, the arrangement pitch of the lock button 11a also has to be made smaller. Even when the optical fiber photoelectric sensor 20 as shown in FIG. 20 is installed in units of a plurality of channels, the lock button connected to the holder fastening member generally has a small vertical stroke when moving during the alternate operation.

Therefore, there is a drawback that it is difficult to visually confirm whether the optical fiber cable is in the locked state or the released state by the height of the lock button. Also, in the multi-channel type optical fiber photoelectric sensor, when all channels are locked or released at the same time, the upper surfaces of the lock buttons are aligned, which makes it difficult to visually confirm the state. Therefore, there is a demand for an optical fiber lock device that can easily identify the locked or released state of the optical fiber cable in each channel from the outside.

FIG. 20 is an external view of the optical fiber type photoelectric sensor 20 constructed for such a purpose.
As shown in FIG. 20A, a holder tightening member 22 is attached to the front surface of the main body case 21 together with a cable holder (not shown), and a cover 23 is attached to the outside thereof. As shown in FIGS. 20A and 20C, the holder tightening member 22 is provided with a lock button 22a on the upper portion thereof. The lock button 22a is a pressing portion for locking or releasing the optical fiber cable as in the second embodiment. However, unlike the second embodiment, the lock button 22
A key top 22b having a large area is formed integrally with a in the longitudinal direction of the main body case 21. Key top 22b
The width of is to be within the width of the main body case 21.

In this way, the operating surface of the lock button 22a becomes large, and even if the flat optical fiber type photoelectric sensor 20 is provided adjacent to a large number of channels, touching the plurality of lock buttons 22a with a plurality of channels makes it possible to obtain a large number of channels. The locked or released state of the lock button 22a can be easily confirmed by touch. Further, as described in the second embodiment, the elastic force of the coil spring is large, and when locking the optical fiber cable, a large pressing force must be applied against the elastic force of the coil spring. Since the contact surface of the lock button 22a of the present embodiment with the finger is large, the lock button 22a can be easily pushed.

Next, the optical fiber type photoelectric sensor 30 shown in FIG. 21 is an example in which the lock button 32a portion is two-color molded. As shown in FIG. 21, the optical fiber type photoelectric sensor 30
20, the cable holder, the holder fastening member 32, and the cover 33 are connected to the front surface of the main body case 31, respectively, as in the case shown in FIG.

Unlike the lock button 32a shown in FIG. 20, the side surfaces that slide vertically are two-color molded with resins of different colors. That is, the upper portion of the side surface is molded with the first color and the lower portion of the side surface is molded with the second color. For example, in FIG.
In the state in which the lock button 32a is pressed as shown in (a) and (d), only the portion molded in the first color appears, and the lock button 3 as shown in FIGS.
In the released state of 2a, the second color also covers the cover 33.
Appears above. By doing so, even when a large number of optical fiber photoelectric sensors 30 are arranged adjacent to each other, it is possible to easily identify from the outside whether the locked state or the released state by checking the presence or absence of the second color in the lock button 32a. can do. Since the holder tightening member and the cable holder in these embodiments are the same as those in the second embodiment, their description will be omitted.

Further, a light emitting element similar to that used in a general mechanical switch is provided in the lock button or key top so that the light emitting element illuminates the upper surface of the lock button 32 when the lock button is pressed. It is clear that it is okay. When the lock button 32a is molded in two colors, for example, if the color to be arranged in the upper part is gray and the color to be arranged in the lower part is red, the optical fiber lock device is in the released state when the red color is visible. Will indicate that the photoelectric sensor is not in operation. This also has the effect of preventing the careless pulling out of the optical fiber cable.

Next, in a multi-channel type optical fiber type photoelectric sensor including an optical fiber locking device,
As a modified example of the embodiment, an optical fiber type photoelectric sensor provided with a display unit for displaying a channel at the fiber insertion port of each optical fiber cable will be described.

In general, a multi-channel optical fiber type photoelectric sensor is often used by incorporating it into a field device or the like, and the optical fiber type photoelectric sensor may not be directly visible. In particular, when a large number of optical fiber cables are detached and each optical fiber cable is attached to the optical fiber lock device again through the fiber insertion port, the attachment pitch is narrow, so that there is a risk of incorrect insertion. For this reason, it is necessary to display the channel number for each fiber insertion port, but the price cannot be ignored in the method of attaching a label near the fiber insertion port, and it must be attached so that it exactly matches each fiber insertion port. I have to. Further, when inserting the optical fiber cable, it is necessary to look into the respective fiber insertion ports from the front, and the mounting operability is poor.

FIG. 22 is a perspective view showing the appearance of an optical fiber type photoelectric sensor 40 in which such a point is improved. As shown in the figure, on the side surface of the cover 42 connected to the case main body 41, a concave or convex arrow-shaped display indicating the light projecting side and the light receiving side is provided. Further, a cut 42b or an unevenness 42c as shown in FIG. 23A or 23B is provided on the surface of the cover 42 including the fiber insertion port 42a of each channel. FIG. 23
The notch 42b shown in (a) is a linear notch provided between the fiber insertion ports 42a on the light projecting side and the light receiving side of each channel, so that the correspondence between the upper and lower insertion ports can be understood. Further, in the example shown in FIG. 23B, the unevenness 42c is provided between the upper and lower fiber insertion openings 42a. The unevenness 42c is a portion where the front surface of the cover 42 is resin-molded into a concave shape or a convex shape, and by touching the front surface of the cover 42 with a hand, the channel number can be directly confirmed with the feeling of a finger.

Further, as shown in FIG. 22, display elements 41a may be provided on the top surface of the main body case 41 so as to correspond to the respective channels. In this case, the front fiber insertion port 42a and the channel display on the upper surface of the case main body 41 are displayed. And display element 41
As long as the array of a corresponds to one row, the channel number of each optical fiber cable can be easily identified from the upper part of the optical fiber photoelectric sensor 40.

If the main body case 41 has the channel display and the display element 41a, as shown in FIG.
Correspondence can be easily identified without displaying the channel on the front side of 2. With this configuration, the optical fiber cable of each channel can be accurately inserted into a predetermined fiber insertion port without looking into the fiber attachment surface.

[0066]

As described in detail above, according to the invention of claim 1 of the present application, a plurality of optical fiber cables can be detachably held by one cable holding means.
By tightening or releasing the cable tightening means, it is possible to connect or disconnect the light projecting element and the light receiving element, and the effect of reducing the mechanical parts of the optical fiber locking device per channel is produced.

According to the invention of claim 2 of the present application, a set of cable holder and lock lever are provided to lock and release a plurality of optical fiber cables to the main body of the photoelectric sensor collectively. Therefore, the optical fiber cables for two channels can be locked or released by operating the lock lever once. Therefore, the structure of the optical fiber lock device is simplified and the number of parts is reduced. Further, since the optical fiber lock device for locking the plurality of optical fiber cables is simplified, the effect of reducing the number of assembling steps can be obtained. Furthermore, since the mounting interval of the lock lever is widened, the operability of locking or releasing is improved.

Further, according to the invention of claim 3 of the present application, in order to collectively lock a plurality of optical fiber cables to the main body of the optical fiber type photoelectric sensor or the like, a pair of cable holder and holder tightening member are provided. . Therefore, the number of locking devices is half the number of channels of the optical fiber cable. Therefore, by operating the lock button once, the optical fiber cables for two channels can be locked or released at the same time. Further, since the internal structures of the cable holder and the holder tightening member are symmetrically configured, the fiber tightening force for two channels does not depend on the processing accuracy and is uniform. Furthermore, since the pin installed inside the cable holder is held inside the coil spring inside the lock button, pin pressing becomes unnecessary,
This has the effect of reducing the number of parts. Further, the sliding portion related to the locking device is reduced, and the locking failure due to the sliding wear of the parts is significantly reduced.

Further, according to the invention of claim 4 of the present application, since the display element or the mark is provided at the connection position of the pair of optical fiber cables, when the optical fiber cable is attached to the multi-channel type optical fiber type photoelectric sensor. , Correspondence between the light emitting and receiving fibers is clarified, and incorrect insertion can be prevented. Further, it is not necessary to attach a display label for displaying the channel number to the body of the optical fiber type photoelectric sensor or the like, and the price can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration of a main part of an optical fiber lock device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the shapes of a cover and a main body case in an optical fiber type photoelectric sensor including the optical fiber locking device of the first embodiment.

FIG. 3 is a plan view showing a configuration of a lock lever used in the optical fiber lock device according to the first embodiment.

4A and 4B are configuration diagrams of a cable holder used in the optical fiber lock device according to the first embodiment, in which FIG. 4A is a front view and FIG.
Is a cross-sectional view taken along line XX, and (c) is a cross-sectional view taken along line YY.

FIG. 5A is a plan view of a protruding cam formed on the cable holder of the first embodiment, and FIG. 5B is an explanatory view showing an engagement state between the lock lever and the protruding cam.

FIG. 6 is an exploded perspective view showing a configuration of a main part of an optical fiber lock device according to a second embodiment.

FIG. 7A is an external perspective view of a cover of an optical fiber type photoelectric sensor including the optical fiber locking device of the second embodiment,
(B) is an external perspective view of the main body case.

FIG. 8 is a front view showing the configuration of a holder tightening member used in the optical fiber locking device of the second embodiment.

FIG. 9 is a sectional view taken along line EE showing the configuration of the holder tightening member in the second embodiment.

FIG. 10 is a rear view showing the structure of a holder tightening member in the second embodiment.

11A is a sectional view taken along line FF showing the configuration of the holder tightening member of the second embodiment, and FIG. 11B is a top view.

FIG. 12A is a plan view showing the shape of a heart-shaped cam provided in the optical fiber locking device of the second embodiment, and FIG.
FIG. 6 is a cross-sectional view showing the structure of the sliding surface of the cam groove of the heart-shaped cam.

FIG. 13 is a front view showing the configuration of a cable holder used in the optical fiber lock device according to the second embodiment.

FIG. 14 is a side view showing the configuration of the cable holder of the second embodiment.

FIG. 15 is a rear view showing the configuration of the cable holder according to the second embodiment.

16A is a sectional view taken along the line K1-K2-K3-K4 showing the configuration of the cable holder according to the second embodiment, and FIG.
Is a top view thereof.

FIG. 17 is a partial cross-sectional view showing a mounting relationship between a pin, a cable holder, and a holder fastening member in the optical fiber locking device of the second embodiment.

FIG. 18 is an explanatory view showing the operation of the optical fiber locking device of the second embodiment, (a) is a side view showing the relationship between the holder tightening member and the cable holder in the released state, and (b) is a sectional view thereof. is there.

FIG. 19 is an explanatory view showing the operation of the optical fiber locking device of the second embodiment, (a) is a side view showing the relationship between the holder tightening member and the cable holder in the locked state, and (b) is a sectional view thereof. is there.

20A and 20B are external views of an optical fiber type photoelectric sensor (part 1) including an optical fiber locking device of a third embodiment of the present invention, (a) is a side view, (b) is a top plan view, and (c) is a top view. ) Is a front view, (d) is a partial side view, and (e) is a rear view.

21A and 21B are external views of an optical fiber type photoelectric sensor (part 2) including an optical fiber locking device according to a third embodiment of the present invention, (a) is a side view, (b) is a top plan view, and (c) is a top view. ) Is a front view, (d) is a partial side view, and (e) is a rear view.

FIG. 22 is a perspective view showing the appearance of a multi-channel optical fiber photoelectric sensor.

FIG. 23 is a front view showing a front surface of a cover of a multi-channel optical fiber photoelectric sensor.

[Explanation of symbols]

 1 Lock Lever 1a Operation Part 1b Projection Cam 1c Shaft Hole 1d Pressing Protrusion 1e Slit 2,12 Cable Holder 2a, 2a 'Fan-shaped Projection 2b, 12b Vertical Groove 2c, 12c Fiber Mounting Hole 2d, 12f Pin Hole 2e, 16 Pin 2f, 4b, 12e Claw 2g, 12d Flexible part 3,13,33 Cover 3a, 42a Fiber insertion port 4,14, 21, 31 Main body case 4a Housing 10, 20, 30, 40 Optical fiber photoelectric sensor 11, 22, 32 Holder tightening member 11a, 22a, 32a Lock button 11b Holder tightening part 11c Flat plate part 11d Long hole 11e Spring holding part 11f Square protrusion 11g Unlocking notch 12a Pin holder 12h Cable guide part 13a Fiber insertion port 13b Notch 14a Engagement hole 15 Heart-shaped cam 15a Groove 15b Heart-shaped protrusion 17 Coil spring 22a Key top 41a Display element 42b Notch 42c Unevenness

Claims (4)

[Claims] 1. An optical fiber lock device for detachably holding a light projecting side optical fiber and a light receiving side optical fiber, wherein a plurality of pairs of optical fiber cables composed of the light projecting side and the light receiving side optical fiber are detachable. A cable holding means for holding the cable holding means, a cable tightening means that is held so as to be engageable with the cable holding means, and that tightens and releases the plurality of pairs of optical fiber cables with respect to the cable holding means; An optical fiber lock device comprising: a light projecting element that engages and outputs light to the light projecting side optical fiber; and a main body case that includes a light receiving element that photoelectrically converts light of the light receiving side optical fiber. . 2. A cable holder that detachably holds a plurality of pairs of optical fiber cables composed of a light-transmitting side optical fiber and a light-receiving side optical fiber; and a cable holder that is rotatably held with respect to the cable holder. A lock lever that tightens and releases with respect to the cable holder, a light projecting element that engages with the cable holder and outputs light to the light projecting side optical fiber, and a light receiving element that photoelectrically converts light of the light receiving side optical fiber. An optical fiber lock device comprising: a main body case including; and the cable holder, wherein the light projecting side optical fiber and the light receiving side optical fiber are inserted, and an inner diameter of an insertion port is equal to or more than an outer diameter of the optical fiber. Multiple sets of fiber mounting holes that elastically deform, and fan-shaped integrally on the side surface of the fiber mounting hole, and the diameter of the specific fiber mounting hole by pressing A plurality of sets of fan-shaped projections to be changed, and a vertical groove that gives a turning space for the lock lever to press two sets of the fan-shaped projections at the same time. A pair of pressing protrusions formed on both side surfaces at positions that are axisymmetric to each other, and an arm that rotates the protruding cam at a position that abuts against the fan-shaped protrusion and a position that does not abut. An optical fiber lock device characterized by being present. 3. A cable holder that detachably holds a plurality of pairs of optical fiber cables composed of a light-transmitting side optical fiber and a light-receiving side optical fiber, and the optical fiber cable slidably held by the cable holder. A holder tightening member that tightens and releases the cable holder, a light projecting element that engages with the cable holder and outputs light to the light projecting side optical fiber, and photoelectrically converts light of the light receiving side optical fiber. An optical fiber lock device comprising a main body case including a light receiving element, wherein the cable holder is inserted with the light projecting side optical fiber and the light receiving side optical fiber, and an inner diameter of an insertion port is equal to or greater than an outer diameter of the optical fiber. A plurality of sets of fiber mounting holes that elastically deform as follows and the side surface of the fiber mounting hole are integrally molded, and the hole diameter of the fiber mounting hole is changed by pressing. A fin having a fin shape, and a U-shaped pin having one end rotatably held by a part of the cable holder and the other end slidably engaged with a part of the holder tightening member. The holder tightening member is provided with a lock button that applies a pressing force, and a notch for releasing the tightening that is integrally formed with the lock button and that fits with the claw of the cable holder. A holder fastening portion and a heart shape formed on a part of the holder fastening portion and moving the holder fastening member to a fastening position or a releasing position of the optical fiber cable by engaging with the other end of the pin. An optical fiber locking device comprising: a cam. 4. The display device, wherein the optical fiber lock device associates, for each channel, a light emitting side and a light receiving side optical fiber corresponding to the light emitting side for each channel at a connection position of the pair of optical fiber cables on the light emitting side and the light receiving side. The optical fiber lock device according to any one of claims 1 to 3, further comprising a display means for displaying.