JP4929089B2 - Sensor mounting tool and fixing tool for sensor fixing - Google Patents

Description

The present invention relates to a sensor fixture such as a photoelectric sensor and a fixture for fixing the sensor.

Generally, as a method of attaching a sensor such as a photoelectric sensor to the installation surface, a method of attaching the sensor to the installation surface via a fixture in order to fix the sensor to the installation surface in a different posture from the case where the sensor is directly fixed to the installation surface. There is. For example, a sensor fixture disclosed in Japanese Patent Application Laid-Open No. 6-194458, which is a prior art, has an installation surface having a horizontal plate that is horizontal to the installation surface and a vertical plate that is perpendicular to the installation surface. A configuration is disclosed in which the sensor is fixed in a posture perpendicular to the installation surface by installing the sensor on a vertical plate.

That is, in detail, a sensor mounting structure as shown in FIG. 1 is known. Here, as an example of the sensor, a mounting structure of the amplifier built-in photoelectric sensor will be described. The sensor 31 has at least a pair of through holes 34a and 34b at positions that do not interfere with main functional components such as a light projecting part and a light receiving part built in the sensor 31, and the same so as to correspond to the through holes 34a and 34b. The sensor mounting base plate 3 of the L-shaped bracket 1 is provided with at least a pair of sensor mounting holes 5a and 5b with an interval of. When fixing the sensor 31 to the L-shaped metal fitting 1, fixing members such as bolts 9 a and 9 b are inserted into the sensor mounting holes 5 a and 5 b and the through holes 34 a and 34 b provided in the sensor 31, respectively. The sensor 31 is fixed by attaching fastening members such as nuts 11a and 11b to the tip portions of the bolts 9a and 9b protruding from the bolts 9a and 9b.

JP-A-6-194458

According to the conventional example shown in FIG. 1, the operator first inserts the bolt 9 a into the sensor mounting hole 5 a provided in the L-shaped metal fitting 1 and the through hole 34 a provided in the sensor 31. The tip of the bolt 9a is projected from the opposite side. Then, in order to maintain the state where the tip of the bolt 9a protrudes from the through hole 34a, the sensor 31 and the bolt 9a are held with one hand, and the positional relationship between the L-shaped bracket 1, the sensor 31 and the bolt 9a is determined. However, it is necessary to attach the nut 11a to the tip of the bolt 9a with the other hand and fix the sensor 31 to the L-shaped metal fitting 1, and both hands are required for the mounting work, and it takes time and effort. Further, it is necessary to repeatedly perform the same operation as the above-described operation on the bolt 9b, and there is a problem that it takes time and effort for the mounting operation.

The present invention has been made paying attention to the above-mentioned problems, and its purpose is to insert a fixing member into a through hole of the sensor, which is a work conventionally required for fixing the sensor to a fixture. Provided is a sensor mounting tool that allows an operator to easily complete a sensor mounting work and a sensor removing work from the mounting tool, which include a work to perform and a subsequent fixing work to the sensor mounting tool. There is.

In order to achieve the above object, the present invention provides:
In order to attach a sensor having a pair of through holes provided at a predetermined interval to an installation surface, an attachment base fixed to the installation surface, and a fixture for fixing the sensor to the attachment base A sensor fixture comprising:
The mounting base is
An installation base plate that is substantially horizontal with the installation surface, is fixed to the installation surface, and stands substantially perpendicular to the installation base plate, and is the same as the predetermined distance between the through holes of the sensor. And a pair of locking holes connected to the insertion hole and spaced at the same interval as the predetermined interval between the through holes of the sensor. Consisting of a sensor mounting plate,
The fixture is
A tip having a cross-sectional shape that can be inserted into the through-hole and the insertion hole and cannot be inserted into the locking hole, and connected to the tip, and can be inserted into the through-hole, the insertion hole, and the locking hole. The insertion portion having a cross-sectional shape, and when the insertion portion is inserted through the insertion hole of the sensor, the distal end portion and at least a part of the insertion portion are set to a length protruding from the insertion hole, and A pair of shaft members slidably movable to the locking holes in a state in which the tip and at least a part of the insertion part protrude from the insertion hole;
A shaft holding portion for holding the pair of shaft members in parallel with a predetermined interval between the through holes of the sensor,
A gripping part attached to the shaft holding part and rotatable about the axis of the shaft holding part, and provided integrally with the gripping part, the tip part and at least a part of the insertion part from the insertion hole After the slide movement to the locking hole in the protruded state, the gripping portion is rotated around the shaft holding portion to press the sensor in the direction of the sensor mounting plate, and the tip portion And an operating member having a cam surface for engaging the engaging portion with the engaging portion.

In addition, the present invention provides a mounting base plate having a substantially horizontal surface, a pair of insertion holes provided substantially vertically from the mounting base plate and spaced apart from each other, and connected to the insertion holes. In addition, a pair of mounting bases provided with a sensor mounting plate having a pair of locking holes provided at the same interval as the predetermined interval and at the same interval as the predetermined interval. A fixing tool for fixing a sensor for fixing a sensor having a through-hole,
The fixture is
A tip having a cross-sectional shape that can be inserted into the through-hole and the insertion hole and cannot be inserted into the locking hole, and connected to the tip, and can be inserted into the through-hole, the insertion hole, and the locking hole. The insertion portion having a cross-sectional shape, and when the insertion portion is inserted through the insertion hole of the sensor, the distal end portion and at least a part of the insertion portion are set to a length protruding from the insertion hole, and A pair of shaft members slidably movable to the locking holes in a state in which the tip and at least a part of the insertion part protrude from the insertion hole;
A shaft holding portion for holding the pair of shaft members in parallel with a predetermined interval between the through holes of the sensor,
A gripping part attached to the shaft holding part and rotatable around the axis of the shaft holding part, provided integrally with the gripping part, provided rotatably around the axis of the shaft holding part, In a state where the distal end portion and at least a part of the insertion portion are protruded from the insertion hole, after the slide movement to the locking hole, the gripping portion is rotated around the shaft holding portion, thereby the sensor. And an operation member having a cam surface for locking the distal end portion to the locking portion.

BEST MODE FOR CARRYING OUT THE INVENTION

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention applied to an amplifier built-in photoelectric sensor will be described below with reference to the drawings.
However, the embodiment shown below exemplifies a sensor fixture and a sensor for embodying the technical idea of the present invention, and the present invention is specified as a fixture for an amplifier built-in photoelectric sensor. Instead, it can be applied to attachment of various sensors such as an ultrasonic sensor and a proximity sensor.

First, the function and basic configuration of the amplifier built-in photoelectric sensor will be described. FIG. 2 is a functional block diagram showing a basic configuration of the amplifier built-in photoelectric sensor 30. The amplifier built-in photoelectric sensor 30 detects the presence / absence of a detection target in the detection region, a light projecting unit 20 that projects light to the detection region in order to detect the presence / absence of the detection target, and reflected light from the detection region. The light receiving unit 21 that receives the light, the light received by the light receiving unit 21 is converted into an electric signal, the converted electric signal is amplified, and the amplified electric signal and the threshold setting unit 27 are set in advance by the operator. The control / amplification unit 22 compares the threshold value and detects whether or not a detection target exists in the detection region, and outputs the detection result. Needless to say, the above-mentioned threshold value can be set and changed to an arbitrary value by the operator.

Next, an example in which the present invention is applied to the mounting structure of the above-described amplifier built-in photoelectric sensor 30 will be described. FIG. 3 is a perspective view of an example in which the present invention is applied to the mounting structure of the photoelectric sensor 30 with a built-in amplifier described above. In this embodiment, the L-shaped bracket 1 is fixed to the installation surface 110 on which the sensor 31 is installed, and the fixture 40 presses the sensor 31 toward the L-shaped bracket 1, whereby the L-shaped bracket 1 and the fixture. The sensor 31 is sandwiched between 40.

FIG. 4 is an exploded perspective view before the sensor 31 is attached to the L-shaped bracket 1. The sensor 31 is provided with a pair of through holes 34 a and 34 b that are paired in a direction perpendicular to the installation surface 110 with a predetermined interval L therebetween. These through holes 34 a and 34 b are provided at appropriate positions that do not interfere with main functional components such as the light projecting unit 20, the light receiving unit 21, and the control / amplifying unit 22 incorporated in the sensor 31 described above. That is, the positions and intervals of the through holes 34a and 34b are determined based on the design layout of the sensor 31 itself. A pair of pins 60a, 60b provided in the fixture 40 and sensor mounting holes 5a, 5b provided in the L-shaped bracket 1 are paired with the same interval L in accordance with the through holes 34a, 34b of the sensor 34 described above. It is provided. Accordingly, the pair of pins 60a and 60b of the fixture 40 can be inserted into the corresponding through holes 34a and 34b and the sensor mounting holes 5a and 5b of the sensor 31, respectively. In the present embodiment, an example in which the through holes 34a and 34b are paired in a direction perpendicular to the installation surface is shown. However, the paired direction is not limited to the vertical direction, and may be a horizontal direction. May be the direction.

The L-shaped metal fitting 1 includes a mounting base plate 2 having a horizontal surface with respect to the installation surface 110 and a sensor mounting plate 3 erected vertically from the mounting base plate 2. As shown in FIG. 4, the attachment base plate 2 has two screw insertion holes 4a and 4b for attaching to the installation surface 110 provided with two screw holes 111a and 111b in advance. When the mounting base plate 2 is temporarily positioned on the installation surface 110, one of the two screw insertion holes 4a and 4b is arranged in the direction in which the screw holes 111a and 111b are provided on the installation surface 110, and the other is the screw hole 111a. It has a long hole shape extending in a direction orthogonal to the arrangement direction of 111b. Therefore, the operator can finely adjust the attachment position of the L-shaped metal fitting 1 on the installation surface 110 in any of these directions.

FIG. 5 is a front view of the sensor mounting plate 3 of the L-shaped bracket 1. The pair of sensor mounting holes 5a and 5b provided in the sensor mounting plate 3 has a shape in which circular holes having different diameters are connected to each other. More specifically, the insertion holes 6a and 6b each having a large diameter and the locking holes 8a and 8b having a smaller diameter than the insertion holes 6a and 6b are formed on the installation surface 110 via the guide holes 7a and 7b. Are connected in a vertical direction. The dimensions of the holes forming the sensor mounting holes 5a and 5b are limited by the relationship with the diameters of pins 60a and 60b to be described later inserted into these holes, but details will be described later.
In this embodiment, the insertion holes 6a and 6b and the locking holes 8a and 8b are connected via the guide holes 7a and 7b. However, the insertion holes 6a and 6b and the locking holes 8a and 8b are directly connected. It may be connected. Moreover, although the insertion holes 6a and 6b and the locking holes 8a and 8b are connected in a direction perpendicular to the installation surface 110, the present invention is not limited to the vertical direction and may be in a horizontal direction. Other directions may also be used. Moreover, although the L-shaped metal fitting was illustrated in the present Example, it does not necessarily need to be L-shaped and may be, for example, an inverted T-shaped. Further, in this embodiment, two sets of sensor mounting holes, sensor mounting holes 5a and 5b and sensor mounting holes 5c and 5d, are used as sensors so that the operator can appropriately select the installation direction of the sensor 31 with respect to the sensor mounting plate 3. The example currently formed in the attachment plate 3 is shown.

The sensor 31 is pressed by the fixture 40 toward the L-shaped metal fitting 1 described above. FIG. 6 is a schematic overall view of the fixture 40. The fixture 40 includes a pair of pins 60a and 60b, an elastically deformable leaf spring 50, a base 90 that supports the pair of pins 60a and 60b, and an operation member 100 operated by an operator.
One ends of the pins 60a and 60b in the longitudinal direction are cantilevered by a base 90, and the fixture 40 as a whole has a substantially U-shaped shape. The leaf spring 50 has an elongated rectangular flat plate shape, and a pair of pins 60a and 60b are inserted into both longitudinal ends thereof. As will be described in detail later, the leaf spring 50 is attached such that one surface thereof faces a cam surface 105 provided on an operation member 100 described later and the other surface faces a side surface of the sensor 31. An operation member 100 is attached to the base 90 so as to be rotatable about the longitudinal axis of the base.

FIG. 7 is a detailed view of the pin 60a. Each pin 60a as a shaft member includes a shaft portion 61a and a head portion 66a, and the head portion 66a is connected to one longitudinal end portion of the shaft portion 61a. Since the pin 60b has exactly the same configuration as the pin 60a, a detailed description thereof is omitted here.
The shaft portion 61a is formed of a tip portion 62a, a small diameter portion 63a as an insertion portion, a sensor support portion 64a, a leaf spring support portion 65a, and a head portion 66a in order from the tip portion 62a side. A first tapered surface 67a that is tapered toward the distal end is formed at the distal end of the distal end portion 62a in order to facilitate insertion into the through hole 34a of the sensor 31 and the sensor mounting hole 5a.

Each part of the shaft portion 61a has a different diameter. The small-diameter portion 63a has a diameter smaller than that of the distal end portion 62a, and a second tapered portion is formed in a direction opposite to the first tapered surface at the connection portion, that is, from the distal end portion 62a toward the small-diameter portion 63a. A tapered surface 68a is formed. The leaf spring support portion 65a has a smaller diameter than the sensor support portion 64a, and a third taper surface 69a that is tapered from the sensor support portion 64a toward the leaf spring support portion 65a is formed at the connection portion.
Both sides of the head portion 66a are formed as flat surfaces, and a fourth tapered surface 70a that is tapered toward the distal end as shown in FIG. 7 is formed on the surface to which the shaft portion 61a is not connected. Has been.

The diameters of the distal end portion 62a and the small diameter portion 63a are determined by the relationship with the diameter of each hole of the sensor mounting hole 5a shown in FIG. The tip 62a is set to have a smaller diameter than the insertion hole 6a provided in the sensor mounting plate 3 of the L-shaped metal fitting 1 and a larger diameter than the locking hole 8a and the guide hole 7a. On the other hand, the diameter of the small diameter portion 63a is set smaller than that of the locking hole 8a and the guide hole 7a. That is, the distal end portion 62a can be inserted only into the insertion hole 6a, and the small diameter portion 63a adjacent to the distal end portion 62a is set to be able to be inserted into all the holes of the sensor mounting hole 5a. Thus, as will be described later, by inserting the pin 60a of the fixture 40 into the insertion hole 6a of the L-shaped metal fitting 1 through the sensor 31, one end of the pin 60a and at least one of the second tapered surfaces 68a. Projecting from the surface opposite to the surface to which the sensor 31 is attached, and then sliding the pin 60a toward the locking hole 8a, thereby causing the second tapered surface 68a to move around the locking hole 8a. It can be locked to the surface.
In the above embodiment, by providing the second tapered surface 68a, the peripheral surface of the locking hole 8a and the peripheral surface of the second tapered surface 68a corresponding to the diameter of the locking hole 8a abut. Thus, even if a slight dimensional error occurs in the diameter of the locking hole 8a, the shaft portion 61a can be locked in a stable state in which the center of the locking hole 8a and the central axis of the shaft portion 61a coincide. However, if the coincidence between the center of the locking hole 8a and the central axis of the shaft portion 61a is not a big problem, the connecting portion of the tip portion 62a and the small diameter portion 63a is formed in a simple step, and the step surface is locked. It may be locked by hitting a plane with the hole 8a.
In the above embodiment, the pair of pins 60a and 60b and the base 90 that supports the pins 60a and 60b are described as separate members. However, the pins 60a and 60b and the base 90 are integrated. It may be formed automatically.
Further, in the above embodiment, the insertion hole 6a and the locking hole 8a are circular holes, and the cross section perpendicular to the axial direction of the shaft part 61a is circular, so that each part of the shaft part 61a is based on the size of each diameter. Determines whether the insertion hole 6a and the locking hole 8a can be inserted or not. However, whether or not each portion of the shaft portion 61a can be inserted into the insertion hole 6a and the locking hole 8a depends on each portion of the shaft portion 61a, the shape of the insertion hole 6a and the locking hole 8a, and its shape. Needless to say, this is due to the size and not the diameter.

FIG. 8 is an exploded perspective view of the fixture 40. The base 90 includes base end portions 91a and 91b provided at both ends thereof, and a base shaft 93 having a circular cross section that connects the base end portions 91a and 91b. Each of the base end portions 91a and 91b is provided with first shaft portion insertion holes 92a and 92b through which the pair of shaft portions 61a and 61b are inserted, and the pair of shaft portions 61a and 61b are respectively inserted into the base end portions 91a and 91b. The pins 60a and 60b are cantilevered in parallel with the interval L described above.

The head portions 66a and 66b have a larger diameter than the first shaft portion insertion holes 92a and 92b, and the first shaft when the shaft portions 61a and 61b are inserted into the first shaft portion insertion holes 92a and 92b. The surfaces that contact the part insertion holes 92a and 92b are formed as flat surfaces. Similarly, since the surfaces of the base end portions 91a and 91b that are in contact with the head portions 66a and 66b are also formed as flat surfaces, when the shaft portions 61a and 61b are inserted into the first shaft portion insertion holes 92a and 92b, Therefore, the length from the base 90 to the tip portion 61a of the shaft portion 60a can be positioned at a predetermined length.
In addition, the above-mentioned contact means a state where the contact is essentially complete, and it is desirable that there is no gap in the present embodiment, but the meaning including an unintended slight gap caused by a dimensional error or an assembly error of each part is also included. It is.

Second shaft part insertion holes 51a and 51b for inserting the shaft parts 61a and 61b are formed at both ends of the elastically deformable leaf spring 50, and the shaft parts 61a and 61b are inserted into the second shaft part 61a and 61b, respectively. As shown in FIG. 9, E-rings 107a and 107b are mounted between the leaf spring 50 and the third tapered surfaces 69a and 69b so that the leaf spring 50 is positioned on the leaf spring support portions 65a and 65b. The minimum diameter of the E-rings 107a and 107b is set smaller than the diameter of the sensor support portions 64a and 64b and slightly larger than the diameter of the leaf spring support portions 65a and 65b. The rings 107a and 107b themselves are prevented from slipping out, and the leaf spring 50 is prevented from slipping out simultaneously. The movable range in the longitudinal direction of the pins 60a and 60b of the leaf spring 50 is limited within the leaf spring support portions 65a and 65b by the E-rings 107a and 107b, respectively.
In the present embodiment, the second shaft portion insertion holes 51a and 51b are provided at both longitudinal ends of the leaf spring 50 and the pins 60a and 60b are inserted. A substantially C-shaped notch may be provided and attached from the radial direction of the pins 60a and 60b.

An operation member 100 is attached to the base shaft 93 so as to be rotatable around the axis of the base shaft 93. The operating member 100 is integrally formed with a base shaft holding part 101, cam surfaces 105 a and 105 b, and a grip part 104. Furthermore, pin positioning projections 106a and 106b for positioning the pins 60a and 60b are formed on the grip portion 104.
As shown in FIG. 8, the base shaft holding part 101 has a substantially cylindrical shape, and has an opening 102 that is partially open in the circumferential direction. When the opening 102 of the base shaft holding part 101 is pressed against the base shaft 93, since the base shaft holding part 101 is a resin having a slight flexibility, the opening 102 temporarily expands and the base shaft The holding unit 101 holds the base shaft 93.

Cam surfaces 105 a and 105 b for pressing the leaf spring 50 are provided on the outer peripheral surface of the base shaft holding portion 101. The cam surfaces 105a and 105b start a cam operation at a predetermined rotation angle around the axis of the base shaft 93, regardless of which direction the operation member 100 is rotated from the initial state shown in FIG. Thus, the two cam surfaces 105a and 105b are formed at predetermined rotation positions corresponding to the respective rotation directions.

The grip portion 104 has a rectangular substantially flat plate shape having a predetermined width in the radial direction of the base shaft 93. Although details will be described later, the cam surface 105a or the cam surface 105b pins the plate spring 50 described above when the operator grips the grip portion 104 and rotates the operation member 100 around the axis of the base shaft 93. As a result, the sensor 31 can be clamped between the L-shaped bracket 1 and the fixture 40.

In the present embodiment, the base shaft holding part 101 has the opening 102 and the base shaft 90 is clamped by being pressed against the base shaft 90. However, for example, the base shaft holding part 101 May have a completely cylindrical shape without the opening 102 and may be attached so as to surround the base shaft 90, or a bearing may be provided between the base shaft holding part 101 and the base shaft 93. Thus, the base shaft 90 may be attached so as to be rotatable.

In the present embodiment configured as described above, the operation of each part when the sensor 31 is fixed to the L-shaped metal fitting 1 will be described.
10 is a side view showing the initial state of the fixture 20 before inserting the pins 60a, 60b provided on the fixture 20 into the through holes 34a, 34b of the sensor 31 and the sensor mounting holes 5a, 5b of the L-shaped bracket 1. It is. Since the side view seen from the pin 60a side is the same as the side view seen from the pin 60b side, the description will be made based on the side view seen from the pin 60b side.

A pin positioning projection 106b provided on the operation member 100 is in contact with the upper surface of the head 66b of the pin 60b. As a result, the planar lower surface provided on the head 66b of the pin 60b is pressed against the planar upper surface of the base end portion 91a, so that the relationship between the pin 60b and the base 90 maintains that relationship. Will be positioned. Therefore, if the operator tries to insert the pin 60b into the through hole 34b of the sensor 31 and the sensor mounting hole 5b, the operator cannot insert the pin 60b well, and a force that pushes the pin 60b from the distal end side of the pin 60b toward the head 66b works. Even if it has occurred, the pin 60b does not move in the direction opposite to the insertion direction of the pin 60b, and the positional relationship between the pin 60b and the base 90 can be maintained.

The operator inserts the pins 60a and 60b into the insertion holes 6a and 6b provided in the L-shaped bracket 1 via the sensor 31 as shown in FIG. 13 while maintaining the fixture 20 in the state shown in FIG. The tip portions 62a and 62b of 60a and 60b and at least part of the second tapered surfaces 68a and 68b are projected from the surface of the sensor mounting plate 3 opposite to the surface to which the sensor 31 is mounted. Thereafter, while maintaining the protruding state, as shown in FIG. 14, by sliding the pins 60a, 60b from the insertion holes 6a, 6b to the locking holes 8a, 8b via the guide holes 7a, 7b, The second tapered surfaces 68a and 68b are locked to the peripheral surfaces of the locking holes 8a and 8b. Note that the slide movement may be performed by holding the grip portion 104 or may be performed while holding any part of the fixture 20.

Subsequently, in order to lock the sensor 31 with the L-shaped bracket 1 and the fixture 20 from the state of FIG. 14, the operator grips the grip portion 104 of the operation member 100 and moves the operation member 100 to the axis of the base shaft 93. Rotate around.
In the present embodiment, the through holes 34a and 34b of the sensor 31 are provided at the corners near the surface of the sensor 31 on which the light projecting / receiving window 32 is formed. For example, the through holes 34 a and 34 b are located on the side surface of the sensor 31 and the height of the sensor 31 is rotated in the direction opposite to the formed surface, that is, the direction in which the grip portion 104 contacts the side surface of the sensor 31. When the sensor 31 is provided near the center of the depth direction orthogonal to the direction, the sensor 31 is locked so that the operation member 100 does not interfere with the light projecting / receiving window 32 even if the operation member 100 is rotated in any direction. Is possible. That is, the operator may select a rotation direction that does not impair the original function of the sensor based on the position where the through holes 34a and 34b are provided, and execute the rotation operation.

FIG. 11 is a side view of the fixture 20 in the middle of the transition of the sensor 31 from the unlocked state to the locked state, and shows a state in which the operating member 100 is rotated to the fourth tapered surface 70b of the head 66b. . The pin positioning projection 106b having a thin flat plate shape rotates while sliding on the upper surface of the head 66b while being elastically deformed. Accordingly, the pin positioning projection 106b forms a corner formed by the fourth tapered surface 70b and the upper surface of the head 66b or a corner formed by the fourth tapered surface 70b and the side surface of the head 66b. When passing, the operator is made aware that the sensor 31 is transitioning from the unlocked state to the locked state due to the sound generated by playing the corners by the protrusions 106b and the change in resistance during operation. Is possible.
Needless to say, even when the sensor 31 is shifted from the locked state to the unlocked state, the above-described operation sound and operation feeling can be given to the operator.

When the operation member 100 is further rotated from the state shown in FIG. 11 in order to completely lock the sensor 31, the cam surface 105b provided on the outer peripheral surface of the base shaft holding part 101 as shown in FIG. Press 50 down. FIG. 15 is a front view of a state in which the sensor 31 is completely locked by the L-shaped bracket 1 and the fixture 40. In the state of FIG. 15 in which the sensor 31 is sandwiched, the leaf spring 50 cannot move even if the longitudinal central portion is pressed in the direction of the sensor 31 by the cam surface 105b, and the longitudinal center in the direction of the sensor 31 cannot be moved. Bend so that the part protrudes. The pressed leaf spring 50 presses the sensor 31 in the direction of the L-shaped bracket 1 via the E-rings 107a and 107b.
In the state shown in FIG. 15, the distal end portion of the operation member 100 farthest from the rotation axis of the grip portion 104 abuts the side surface of the sensor 31, and the operation member 100 cannot be rotated any further. Has been.

On the other hand, the operating member 100 receives a repulsive force due to the cam surface 105 b pressing the leaf spring 50, and exerts a force that pulls the base shaft 93 sandwiched by the base shaft holding part 101 away from the sensor 31. . When the base shaft 93 receives a force in a direction away from the sensor 31, base end portions 91a and 91b that are provided at both ends of the base shaft 93 and support the pins 60a and 60b pass through the pins 60a and 60b. Apply a force to pull in the opposite direction. When the pins 60a and 60b are pulled out in the direction opposite to the insertion direction, the second tapered surfaces 68a and 68b are pressed against the peripheral surfaces of the locking holes 8a and 8b of the L-shaped bracket 1 and locked.

In this way, the cam surface 105b presses the sensor 31 in the direction of the L-shaped bracket 1 via the leaf spring 50, and the pins 60a and 60b are pulled out in the direction opposite to the insertion direction, and the second tapered surface 68a. , 68b are pressed against the peripheral surfaces of the locking holes 8a, 8b of the L-shaped metal fitting 1 to be locked. Therefore, the sensor 31 can be fixed between the L-shaped bracket 1 and the fixture 40 without having to separately attach a fastening member to the pair of pins 60a and 60b protruding from the sensor mounting hole.

In this embodiment, the leaf spring 50 pressed by the cam surface 105b is directed toward the clearance 36 formed between the leaf spring 50 and the side surface of the sensor 31 by the sensor protrusions 35a and 35b and the E rings 107a and 107b. Bends so that the central part in the longitudinal direction protrudes. Therefore, even if an error occurs during molding in the thickness of the sensor 31, the thickness of the L-shaped metal fitting 1, and the shape and size of the second tapered surfaces 68a and 68b provided on the pins 60a and 60b, the leaf spring 50 It is possible to absorb the error that occurs. For example, when the thickness of the sensor 31 is slightly increased due to an error during molding, the amount of elastic deformation of the leaf spring 50 is reduced. Conversely, when the thickness of the sensor 31 is slightly reduced, the amount of elastic deformation of the leaf spring 50 is increased. Thus, in both cases, the sensor 31 can be appropriately fixed.

In this embodiment, since the E-rings 107a and 107b are inserted between the leaf spring 50 and the sensor 31, for example, the sensor 31 without the sensor protrusions 35a and 35b described above is also used for the sensor 31. Since the clearances 36 between the leaf spring 50 and the sensor 31 can be ensured by the rings 107a and 107b, the leaf spring 50 is elastically deformed, and a bending region for absorbing the error at the time of molding each component described above is effective. Can be secured.
The E rings 107a and 107b also play a role of pressing the sensor 31 by converting the pressing force of the bent leaf spring 50 into a flat pressure by the E rings 107a and 107b. Therefore, compared with the case where the leaf spring 50 directly presses the sensor 31, there is less fear of damaging the surface of the sensor 31.

Further, in the present embodiment, even when the installation direction of the sensor 31 is changed, the cam surface 105a is formed on both outer peripheral side surfaces of the base shaft holding portion 101 so that the sensor 31 can be fixed by one fixing tool 20. 105b is provided. However, as described above, the rotation direction of the operation member 100 is preferably rotated in a direction in which the grip portion 104 of the operation member 100 contacts the side surface of the sensor 31 as shown in FIG. 3 or FIG. In that case, the distal end portion of the grip portion 104 that is located farthest from the rotation shaft comes into contact with the side surface of the sensor 31, whereby the rotation of the operation member 100 is locked and positioned.
The pressing force with which the cam surfaces 105a and 105b press the leaf spring 50 is maximized in the middle of the rotation before the grip 104 is in contact with the sensor 31, and the operation member 100 is completely rotated, and the rotation from the rotation axis. The shape of the cam surfaces 105a and 105b is such that the peak of the pressing force of the cam surfaces 105a and 105b has passed at the stage where the tip of the gripping portion 104 located at the farthest position is positioned in contact with the sensor 31. Is set. Therefore, the operation member 100 does not rotate freely in the unlocking direction over time, and the sensor 31 is not unintentionally released.

In the present embodiment, the cam surface 105b exemplifies the embodiment in which the sensor 31 is pressed via the leaf spring 50 and the E-rings 107a and 107b. However, the E-ring 107a and 107b are not provided, and the leaf spring 50 directly contacts the sensor 31. You may make it press.
Further, the sensor 31 may be pressed via another flat plate inserted between the side surface of the sensor 31 and the leaf spring 50 instead of the E-rings 107a and 107b. The inserted flat plate converts the pressing force of the leaf spring 50 into a flat pressure to press the sensor 31, and at the initial state before the fixing device 20 shown in FIG. Can be prevented from sliding off the pins 60a and 60b. That is, even when a flat plate is inserted between the leaf spring 50 and the side surface of the sensor 31, substantially the same operations and effects as when the E-rings 107a and 107b are inserted can be obtained.

In this embodiment, cam surfaces 105 a and 105 b are provided on both outer peripheral surfaces of the longitudinal center portion of the base shaft holding portion 101 of the operation member 100, and the cam surfaces 105 a or 105 b are the longitudinal center portions of the leaf springs 50. However, the cam surfaces 105a and 105b may be provided not at the longitudinal center of the base shaft holding portion 101 but at both longitudinal ends. In that case, a pressing member that presses the respective cam surfaces 105a or 105b and presses the sensor 31 may be inserted into each of the pins 60a and 60b independently.

The second embodiment shown in FIG. 16 is a modification of the first embodiment described above. In the first embodiment, the cam surface 105a or 105b is configured to press the sensor 31 in the direction of the L-shaped bracket 1 through the leaf spring 50 and the E-rings 107a and 107b as the operation member 100 rotates. However, in the present embodiment, the cam surface 105 a or 105 b is configured to directly press the sensor 31 in the direction of the L-shaped bracket 1.
The cam surface 105 a or 105 b provided on the outer peripheral surface of the base shaft holding portion 101 directly contacts the side surface of the sensor 31 as the operation member 100 rotates, and presses the sensor 31 in the direction of the L-shaped bracket 1. .
In the first embodiment described above, the plate spring 50 is deformed to absorb the dimensional error in the thickness direction of the fixture 20 and the sensor 31 and the thickness of the L-shaped metal fitting 1, but this second embodiment. In this case, it is necessary to absorb the dimensional error by the structure of the cam surfaces 105a and 105b that directly press the side surface of the sensor 31.

Therefore, in the second embodiment, an elastically deformable elastic layer (not shown) having an elastic deformation amount capable of absorbing a dimensional error is formed on the surfaces of the cam surfaces 105a and 105b with a predetermined thickness. Has been. In this case, in addition to the effect of absorbing the dimensional error described above, there is little fear of damaging the surface of the sensor 31 when pressed. The amount of elastic deformation of the elastic layer is the same as the leaf spring of the first embodiment described above, the thickness of the sensor 31, the thickness of the L-shaped metal fitting 1, and the shape of the second tapered surfaces 68a, 68b provided on the pins 60a, 60b. In addition, it is set to an amount capable of absorbing the total error generated in the size.
In addition, the cam surfaces 105a and 105b are formed of elastically deformable members, and a hollow portion capable of absorbing a dimensional error is provided inside the cam surfaces 105a and 105b, so that the cam surfaces 105a and 105b The surface of the surfaces 105a and 105b may be recessed toward the hollow portion described above to absorb a dimensional error.
Further, in the first and second embodiments, the leaf spring 50 and the cam surfaces 105a and 105b are elastically deformed. However, the fixture 20 for the sensor can be used only once. Needless to say, it may be based on the configuration of a plastically deformable plate member or cam surface.

According to the present invention, a nut or the like is provided by providing a new operation mechanism for rotating an operation member having a cam surface on the extension of the work of inserting a fixing member into a conventional sensor through-hole. Thus, it is possible to reduce the mounting work that has been conventionally required to fasten using the fastening member, and the operator can easily complete the sensor mounting work and removal work with one hand. Furthermore, since the two points provided with the through holes of the sensor can be fixed at the same time, the labor for mounting can be greatly reduced. In addition, even if a slight dimensional error occurs during the molding of the sensor or the fixture, there are excellent effects such as being able to fix the sensor appropriately.

Diagram showing conventional sensor mounting structure Functional block diagram of photoelectric sensor 30 with built-in amplifier Overall view of the present invention Exploded perspective view of the present invention Front view of L-shaped bracket 1 Overall view of fixture 20 Detailed view of pin 60a Exploded perspective view of fixture 20 Exploded perspective view of fixture 20 Side view showing initial state of fixture 20 Side view showing intermediate state of fixture 20 Side view of the fixture 20 in a state in which the operation member 100 is completely rotated. Overall view in a state in which the operation member 100 is not rotated. Front view of the L-shaped bracket 1 in the state of FIG. Overall view in a state in which the operation member 100 is completely rotated. Overall view showing the second embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 L-shaped metal fitting 2 Mounting base plate 3 Sensor mounting plate 4a, 4b Screw insertion hole 5a, 5b Sensor mounting hole 6a, 6b Insertion hole 7a, 7b Guide hole 8a, 8b Locking hole 9a, 9b Screw 10 Reinforcement member 11a, 11b Nut 20 Light Projector 21 Light Receiver 22 Control / Amplifier 23 Light Emitting Lens 24 Light Receiving Lens 25 Work 27 Threshold Setting Unit 30 Built-in Amplifier Type Photoelectric Sensor 31 Sensor 32 Light Emitting / Receiving Window 33 Output Indicators 34a and 34b Through-holes 35a, 35b Sensor protrusion 36 Clearance 40 Fixture 50 Plate spring 51a, 51b Second shaft portion insertion hole 60a, 60b Pins 61a, 61b Shaft portions 62a, 62b Tip portions 63a, 63b Small diameter portions 64a, 64b Sensor head support Portions 65a and 65b Leaf spring support portions 66a and 66b Head portions 67a and 67b First tapered surface 68a 68b 2nd taper surface 69a, 69b 3rd taper surface 70a, 70b 4th taper surface 90 Base 91a, 91b Base end part 92a, 92b 1st shaft part insertion hole 93 Base shaft 100 Operation member 101 Base Base shaft holding part 102 Opening part 104 Grasping part 105a, 105b Cam surface 106a, 106b Projection part for pin positioning 107a, 107b E-ring 110 Installation surface 111a, 111b Screw hole

Claims (10)

In order to attach a sensor having a pair of through holes provided at a predetermined interval to an installation surface, an attachment base fixed to the installation surface, and a fixture for fixing the sensor to the attachment base A sensor fixture comprising:
The mounting base is
An installation base plate that is substantially horizontal with the installation surface, is fixed to the installation surface, and stands substantially perpendicular to the installation base plate, and is the same as the predetermined distance between the through holes of the sensor. A pair of insertion holes provided with a gap therebetween, and a pair of locking holes connected to the insertion holes and provided with the same gap as the predetermined gap between the through holes of the sensor It consists of a mounting plate,
The fixture is
A tip having a cross-sectional shape that can be inserted into the through-hole and the insertion hole and cannot be inserted into the locking hole, and connected to the tip, and can be inserted into the through-hole, the insertion hole, and the locking hole. An insertion portion having an appropriate cross-sectional shape, and a length at which the tip end portion and at least a part of the insertion portion protrude from the insertion hole when passing through the insertion hole through the through hole of the sensor A pair of shaft members slidably movable into the locking holes in a state in which the distal end portion and at least a part of the insertion portion protrude from the insertion hole;
A shaft holding portion for holding the pair of shaft members in parallel with a predetermined interval between the through holes of the sensor,
A gripping part attached to the shaft holding part and rotatable about the axis of the shaft holding part, and provided integrally with the gripping part, the tip part and at least a part of the insertion part from the insertion hole After the slide movement to the locking hole in the protruded state, the gripping portion is rotated around the shaft holding portion to press the sensor in the direction of the sensor mounting plate, and the tip portion And an operating member having a cam surface for engaging the engaging portion with the engaging portion. The grip portion is switched between a pressing position where the cam surface presses the sensor and a non-pressing position where the cam surface does not press the sensor as the shaft holding portion rotates about the axis. The sensor fixture according to claim 1. 3. The sensor mounting tool according to claim 1, wherein a tapered surface that is tapered toward the insertion portion is formed at the distal end portions of the pair of shaft members. 4. An elastically deformable flat plate spring having a pair of shaft mounting portions for mounting on the pair of shaft members has one surface facing the cam surface and the other surface facing the sensor when the sensor is fixed. It is mounted so as to be movable in the longitudinal direction of the shaft member,
The sensor mounting tool according to claim 1, wherein the cam surface presses the sensor via the leaf spring. A washer is inserted into each of the pair of shaft members so that one surface faces the leaf spring and the other surface faces the sensor when the sensor is fixed, so that the sensor and the leaf spring are A bendable region of the leaf spring is formed between,
When the cam surface presses the leaf spring in the direction of the sensor, the leaf spring bends so that the central portion in the longitudinal direction of the leaf spring and the vicinity thereof protrude toward the bendable region,
The sensor mounting tool according to claim 4, wherein the leaf spring presses the sensor via the washer. The sensor attachment according to any one of claims 1 to 3, wherein an elastic body layer capable of elastic deformation is formed on a surface of the cam surface. The pair of shaft members and the shaft holding portion are each constituted by separate members,
The shaft holding portion has a shaft member insertion hole for inserting the pair of shaft members,
The pair of shaft members has the tip end and the other end,
The other end portion is provided with a head portion that is locked to the shaft member insertion hole when the pair of shaft members are inserted from the tip portion into the shaft member insertion hole,
The operation member protrudes from the shaft member insertion hole in a direction opposite to the direction in which the distal end portion is inserted into the through-hole when the gripping portion is in the non-pressing position. The sensor mounting tool according to any one of claims 1 to 6, wherein a shaft positioning portion that limits the amount within a predetermined range is provided. The cross section of the shaft holding portion is substantially circular with a string, the contact portion with the head is formed from a flat surface, and the cross section of the head is substantially trapezoidal and the contact portion with the shaft positioning portion, and The sensor attachment according to claim 7, wherein the contact portion with the shaft holding portion is formed in a flat surface. Predetermined rotation corresponding to each rotation direction so that the cam operation is started at a predetermined rotation angle regardless of which direction the shaft holding portion is rotated about the operation member. The sensor fixture according to claim 1, wherein two cam surfaces are formed at a position. A mounting base plate having a substantially horizontal surface; a pair of insertion holes provided substantially vertically from the mounting base plate; and a predetermined interval; and the predetermined interval connected to the insertion hole. A sensor having a pair of through holes provided at the same interval as the predetermined interval on a mounting base comprising a sensor mounting plate having a pair of locking holes provided at the same interval. A fixture for fixing a sensor for fixing,
The fixture is
A tip having a cross-sectional shape that can be inserted into the through-hole and the insertion hole and cannot be inserted into the locking hole, and connected to the tip, and can be inserted into the through-hole, the insertion hole, and the locking hole. An insertion portion having an appropriate cross-sectional shape, and a length at which the tip end portion and at least a part of the insertion portion protrude from the insertion hole when passing through the insertion hole through the through hole of the sensor A pair of shaft members slidably movable into the locking holes in a state in which the distal end portion and at least a part of the insertion portion protrude from the insertion hole;
A shaft holding portion for holding the pair of shaft members in parallel with a predetermined interval between the through holes of the sensor,
A gripping part attached to the shaft holding part and rotatable about the axis of the shaft holding part, and provided integrally with the gripping part, the tip part and at least a part of the insertion part from the insertion hole After the slide movement to the locking hole in the protruded state, the gripping portion is rotated around the shaft holding portion to press the sensor in the direction of the sensor mounting plate, and the tip portion A fixing tool for fixing a sensor, comprising: an operation member having a cam surface for locking the locking portion to the locking portion.

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