JP2001221206A - Sensor holding device for cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always safely fasten and hold a sensor with a sensor holder by making use of a fastening force of an attaching band without using a setscrew for fixing the sensor to the sensor holder regardless of the direction of a slit of the sensor holder. SOLUTION: In this sensor holding device for the cylinder, a detection switch 3 for detecting position of a piston is inserted and fixed in a sleeve-like switch holder 8 having a slit 7, the sensor holder 8 is fitted inside of a grasping part 11 of an attaching band 16 wound on the outer periphery of a cylinder body 5, and is pressed from the upper side with the grasping part 11 and fixed to the outer periphery of the cylinder body 5. A chevron-shaped top part 8b is formed in the sensor holder 8, thereby clearance between the attaching band and a corner part of the grasping part 11 is created.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder in which the position of a piston of a cylinder operated by air pressure or hydraulic pressure can be detected by a sensor from the outside of the cylinder body, and the sensor is fixed to the outer periphery of the cylinder body. The present invention relates to a sensor holding device.

[0002]

2. Description of the Related Art A sensor holding device for fixing a detection switch, which is a sensor for detecting the position of a piston, to the outer periphery of a cylinder body using a mounting band is disclosed in Japanese Patent Application Laid-Open No. H11-6291.
It is known in, for example, Japanese Patent Publication No.

A conventional example of this type of sensor holding device using a mounting band, which has been put into practical use, will be described. In the conventional example shown in FIGS. The sensor grip 2 is provided, and the detection switch 3 is fitted into the sensor grip 2 and the mounting band 1 is tightened with the tightening screw 4 so that the detection switch 3 is pressed onto the outer periphery of the cylinder body 5 by the sensor grip 2. And fix it.

However, in this case, even if the thickness of the detection switch 3 is slightly different as shown in FIGS. 2 (A) and 2 (B), the sensor grip 2 must be remade, which is uneconomical. If the tightening by the fastening screw 4 is strong, the detection switch 3 may be broken.

[0005] Further, as shown in FIG. 3, in a type in which the detection switch 3 is sandwiched between both ends of the mounting band 6 and fixed with screws 7, the detection switch 3 is directly subjected to a tightening force, which may be destroyed. there were.

Therefore, the following structure is conventionally provided as a type in which the detection switch is protected and fixed on the outer periphery of the cylinder body.

As shown in FIGS. 4 and 5, a sleeve-shaped sensor holder (switch holder) 8 provided with a slit 7 in the rectangular tube so as to be able to cope with the difference in the thickness of the detection switch.
The upper plate 9 is superimposed on the sensor holder 8, and the sensor holder 8 is fixed to a holding portion 11 having a U-shaped cross section at one end of the mounting band 10 with a set screw 12. Then, as shown in FIGS. 6 to 8, after the detection switch 3 is inserted into the sensor holder 8, the mounting band 10 is wound around the cylinder body 5, and the stopper 13 at the other end of the mounting band 10 is gripped. By hooking on the hook 14 protruding from the part 11,
The sensor holder 8 is pressed from above by the gripping portion 11 and fixed on the outer periphery of the cylinder body 5. The detection switch 3 inserted into the sensor holder 8 is clamped and held by the sensor holder 8 because the sensor holder 8 has the slit 7.

In addition, there is a conventional example in which a fastening type mounting band 16 tightened by a fastening screw 15 is used in place of such a hooking type mounting band 10 as shown in FIGS.

[0009]

However, FIG. 4 and FIG.
9 and 10, the sensor holder 8 is a rectangular tube having a flat cross section and a flat upper surface, as shown in detail in FIG. The sensor switch 8 could not be tightened by the sensor holder 8 depending on the direction of the slit 7 of the sensor holder 8 because the band 10 or 16 was in close contact with the inner surface of the grip portion 11 having a U-shaped cross section.

That is, as shown in FIG. 9, when the orientation of the slit 7 is located on the tip side of the holding portion 11 having a U-shaped cross section of the mounting band 16, the pressing force by the holding portion 11 is the width of the slit 7. Therefore, the detection switch 3 serving as a piston position sensor can be tightened by the sensor holder 8. However, when the direction of the slit 7 is located on the opposite side (the base end side of the grip portion 11) as shown in FIG. 10, one corner of the sensor holder 8 is enlarged as shown in FIG. The portion 8a serves as a fulcrum, and
Is applied in a direction to increase the width of the slit 7, so that the detection switch 3 is loosened in the sensor holder 8. In the case of the conventional example shown in FIGS. 4 and 5, since the detection switch is fixed to the sensor holder 8 with the set screw 12, this does not occur. However, there is a problem that the installation space protrudes by the set screw 12.

An object of the present invention is to use a fastening force of a mounting band for a sensor without using a set screw for fixing the sensor to the sensor holder and irrespective of the direction of a slit of the sensor holder. An object of the present invention is to make it possible to always stably hold and hold the holder.

[0012]

According to the present invention, a sensor for detecting the position of a piston is inserted and fixed in a sleeve-like switch holder having a slit, and this sensor holder is mounted on a mounting band wound around the outer periphery of a cylinder body. In a cylinder sensor holding device in which the sensor holder is fitted onto the inside of the grip portion and the sensor holder is pressed down from above and fixed on the outer periphery of the cylinder body, a mountain-shaped top is formed in the sensor holder, and the mounting band is gripped by the top. A gap is formed between the corner of the portion.

[0013]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

The sensor holding device according to the present invention has the same general basic structure as the conventional example shown in FIGS. 9 and 10, except that the shape of the sensor holder 8 having the slit 7 is different. A top portion 8b of a mountain shape is formed so as to protrude, and both side edges of the top portion 8b are inclined surfaces 8c.
The lower surface 8d of the sensor holder 8 is a curved surface along the arc of the outer peripheral surface of the cylinder body 5 to be mounted as shown in FIG.

Since the sensor holder 8 has such a shape, the detection switch 3 is inserted into the sensor holder 8 as shown in FIG. When fitted on the outer periphery of the sensor holder 8, a triangular gap is formed between the inclined surfaces 8 c on both side edges of the sensor holder 8 and the corners of the gripper 11.

Accordingly, the mounting band 16 is connected to the cylinder body 5
When the sensor 7 is tightened with the tightening screw 15, the slit 7 of the sensor holder 8 is positioned on the base end side of the grip 11 as shown in FIG. The pressing force of the portion 11 does not act in the direction of increasing the width of the slit 7, and the detection switch 3 can be always stably held and held by the sensor holder 8 regardless of the direction of the slit 7.

[0017]

According to the present invention, the sensor holder is formed with a chevron-shaped apex, and a gap is formed between the apex and the corner of the gripping portion of the mounting band. It is possible to always stably hold the sensor on the sensor holder by using the tightening force of the mounting band without using a set screw for fixing the sensor to the sensor holder and irrespective of the direction of the slit of the sensor holder. Also, by replacing only the sensor holder, another sensor can be used using the same mounting band. At that time, it is only necessary to change the sensor insertion part of the sensor holder according to the sensor shape, The design is simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional example.

FIG. 2 is a cross-sectional view showing that when the thickness of the detection switch is different according to the conventional example, the sensor grip of the mounting band must be changed.

FIG. 3 is a perspective view of another conventional example.

FIG. 4 is a perspective view showing a relationship between a mounting band and a sensor holder in a conventional example using a sensor holder having a slit.

FIG. 5 is a similar perspective view.

FIG. 6 is a cross-sectional view showing the state of attachment of the cylinder body of the conventional example.

FIG. 7 is a plan view of the same.

FIG. 8 is a side view of the same.

FIG. 9 is a cross-sectional view showing a conventional cylinder body mounting state in which a mounting band is tightened with a tightening screw using a sensor holder having a slit.

FIG. 10 is a similar sectional view when the slit is turned in the opposite direction to FIG. 9;

FIG. 11 is a perspective view of a sensor holder in the conventional example.

FIG. 12 is an enlarged view of a part of FIG. 10;

13A and 13B show a sensor holder used in the present invention, wherein FIG. 13A is a perspective view and FIG. 13B is a front view.

FIG. 14 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 mounting band 2 sensor holding bracket 3 detection switch (sensor) 4 tightening screw 5 cylinder body 6 mounting band 7 slit 8 sensor holder 8b sensor holder top 8c sensor holder inclined surface 9 upper plate 10 mounting band 11 gripping part 12 set screw 13 Stopper 14 Hook 15 Tightening screw 16 Mounting band

Claims (1)

[Claims] A sensor for detecting the position of a piston is inserted and fixed in a sleeve-like switch holder having a slit, and this sensor holder is fitted inside a grip portion of a mounting band wound around an outer periphery of a cylinder body. In a sensor holding device for a cylinder, in which a sensor holder is pressed down from above and fixed on the outer periphery of a cylinder body, a chevron-shaped top portion is formed in the sensor holder, and the top portion forms an angle with a corner of a holding portion of the mounting band. A sensor holding device for a cylinder, wherein a gap is formed between them.