JP2015068790A - Wire sensor, and deceleration structure and high-speed rotation prevention method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire sensor that can reduce or prevent a risk of accidents during wire cutting by keeping a wire from swinging easily when the wire is cut and wound up.SOLUTION: A wire sensor deceleration structure 10 comprises an axis 1 of a wire winding-up drum 7 and a rotation axis 2 on the same axis, a clutch shoe part 3 provided on the periphery of the rotation axis 2, and a non-rotation clutch case 4 provided outside the clutch shoe part 3. The clutch shoe part 3 is energized to the rotation axis 2 by elasticity and makes contact with the clutch case 4 when it has exceeded a certain rotation speed to brake the rotation axis 2.

Description

  The present invention relates to a wire-type detector (hereinafter referred to as “wire sensor”), a speed reduction structure thereof, and a method for preventing rotational speed increase, and in particular, by connecting a wire to a moving body and winding the wire with a spring. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire sensor, a speed reduction structure thereof, and a method for preventing a rotation speed increase that can reduce or prevent the risk of an accident when a wire is cut in a wire sensor that detects a moving distance and a moving speed. .

Conventionally, a plurality of technical proposals have been made for wire sensors (wire type detectors) that connect a wire to a moving body and detect the length (movement distance) of the wire. In Patent Document 1 described later, a rotational speed detector and a rotational displacement detector are coaxially arranged at both ends of the main shaft of the wire drum for the purpose of reducing the influence of the gear gap and the inertia of the system in the wire type speed displacement detector. In addition to being coupled, the main shaft of the wire drum is pivotally supported by the bearings of the rotational speed detector and the rotational displacement detector, and a spring member is interposed between the wire drum and the casing so as to hold the return elasticity to the wire drum. In addition, a detector is disclosed in which the wire is made of a non-metallic material such as a polymer fiber as a raw material, and a fixed seat made of a magnet is provided on one side of the casing so that the wire can be attached with one touch.

Further, in Patent Document 2, in a stroke detector that winds a wire around a drum having a groove in a spiral shape and measures the stroke amount of the object to be detected based on the feed amount of the wire, the wire does not come out of the groove during winding. In order to achieve this, a guide member having a protrusion that meshes with the groove of the drum and a groove that guides the wire is provided, and the guide member is movably supported by a holding tool that meshes with the groove of the drum. The structure to perform is disclosed.

Japanese Utility Model Publication No. 6-45256 “Wire-type velocity displacement detector” (right extinguished) Japanese Utility Model Publication No. 7-36014 “Stroke detector wire winding device” (right extinguished)

  Now, in the wire sensor, the wire is wound by a spring, but there are many cases where the wire is cut. In such a case, the wire wound at high speed is swung, which is very dangerous. That is, if a wire swung around at high speed contacts a nearby worker or the like, an injury may occur, and a serious accident may be caused in some cases. However, technical proposals for preventing and reducing such dangers have not been made yet, including the above-mentioned documents.

  Therefore, the problem to be solved by the present invention is to eliminate the problems of the prior art and make it difficult for the wire to be swung when the wire is cut and wound, thereby reducing the risk of accidents during wire cutting. It is an object to provide a wire sensor, a speed reduction structure thereof, and a rotation speed prevention method that can be reduced or prevented.

  As a result of studying the above problems, the inventor of the present application, when the wire is cut and wound at a high speed, when the winding speed exceeds a certain speed, the clutch shoe spreads outward by centrifugal force and is fixed to the main body. It has been found that it is possible to suppress the wire winding speed and to prevent the wire from being swung by providing a structure that rubs against the clutch case, and the present invention has been completed based on this. That is, the invention claimed in the present application, or at least the disclosed invention, as means for solving the above-described problems is as follows.

[1] A speed reduction structure in a wire sensor for detecting a moving distance and speed of a moving body, the rotating shaft coaxial with the wire winding drum, a clutch shoe portion provided around the rotating shaft, The clutch shoe portion is provided on the outer side of the clutch shoe portion and does not rotate. The rotating shaft is provided with an engaging portion that engages with the clutch shoe portion, and the clutch shoe portion is elastically rotated. A speed reducing structure for a wire sensor, wherein the rotating shaft is braked by contact with the clutch case when the shaft is biased and exceeds a certain rotational speed.
[2] The engaging portion has a convex structure provided on the rotating shaft, and the clutch shoe portion is provided with a concave structure that engages with the convex structure. [1] The speed reducing structure of the wire sensor as described in 2.
[3] The wire sensor deceleration structure according to [2], wherein the convex structure is provided in a centrifugal direction of the rotating shaft.

[4] The wire sensor deceleration structure according to any one of [1] to [3], wherein the urging by the elasticity is performed by an elastic structure provided in the clutch shoe portion.
[5] The wire sensor deceleration structure according to [4], wherein the elastic structure is provided so as to pull the clutch shoe portion in a circumferential direction of the rotation shaft.
[6] The wire sensor deceleration structure according to [4] or [5], wherein the elastic structure is a spring.

[7] The clutch shoe part has at least two ends, and the elastic structure is provided by connecting the adjacent ends, [4] to [6] A wire sensor deceleration structure according to claim 1.
[8] Any one of [4] to [6], wherein the clutch shoe portion includes at least two shoe members, and the elastic structure is provided by connecting the shoe members. The speed reducing structure of the wire sensor as described in 2.
[9] A method for preventing an increase in rotation speed of a wire sensor, wherein the speed reduction structure when the wire is cut is suppressed by the speed reduction structure according to any one of [1] to [8].
[10] A wire sensor comprising the speed reduction structure according to any one of [1] to [8].

  Since the wire sensor, the speed reduction structure thereof, and the rotation speed prevention method of the present invention are configured as described above, according to this, even when the wire is cut and wound, the wire is less likely to be swung. The risk of accidents at the time of cutting can be effectively reduced or prevented.

It is a sectional side view which shows the structure of the wire sensor of this invention. It is a principal part of FIG. 1, and is a sectional side view which shows the structure of the deceleration structure of the wire sensor of this invention. It is BB arrow sectional drawing of FIG. It is AA arrow sectional drawing of FIG. It is a sectional side view explaining the clutch operation | movement at the time of high speed rotation in the deceleration structure of the wire sensor of this invention. 5 is a cross-sectional view of the main part.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side sectional view showing the configuration of the wire sensor of the present invention. Also,
2 is a side sectional view showing the structure of the speed reduction structure of the wire sensor of the present invention, which is a main part of FIG. 1, FIG. 3 is a sectional view taken along the line BB in FIG. 1, and FIG. It is A arrow sectional drawing. As shown in these figures, the speed reduction structure 10 of the present wire sensor is a speed reduction structure in a wire sensor for detecting the moving distance and speed of a moving body, and is a rotation axis coaxial with the axis 1 of the wire take-up drum 7. 2, a clutch shoe portion 3 provided around the rotary shaft 2, and a non-rotating clutch case 4 provided outside the clutch shoe portion 3. The rotary shaft 2 engages with the clutch shoe portion 3. In addition to the engagement portion (FIG. 3), the clutch shoe portion 3 is rotated by being brought into contact with the clutch case 4 when it is biased by the rotating shaft 2 due to elasticity and exceeds a certain rotational speed. The main configuration is that the shaft 2 is formed to be braked.

  The engaging part is provided as a convex structure (FIG. 3) provided on the rotating shaft 2, and the clutch shoe part 3 is provided with a concave structure (FIG. 3) that engages with the convex structure. Is provided in the centrifugal direction of the rotating shaft 2.

  With this configuration, in the present wire sensor, when rotation of the wire take-up drum 7 exceeding a certain rotation speed occurs, the rotation shaft 2 coaxial with the shaft 1 also rotates at the same rotation speed. The clutch shoe portion 3 that is urged against the rotating shaft 2 by elasticity generates a centrifugal force that exceeds a certain value due to the rotation exceeding the certain rotation speed, and thus the clutch case 4 that is fixed. To touch.

  As shown in FIG. 3, since the rotating shaft 2 is provided with an engaging portion (convex structure) that engages with the concave structure of the clutch shoe portion 3, the clutch shoe portion 3 moves in the centrifugal direction by centrifugal force. Even if the clutch case 4 comes into contact, the engagement between the clutch shoe portion 3 and the rotary shaft 2 is maintained. Therefore, the deceleration, that is, the braking of the clutch shoe portion 3 due to the contact friction with the clutch case 4 acts as the braking on the rotating shaft 1 as it is. When the rotating shaft 2 is braked, the shaft 1 of the coaxial wire winding drum 7 is also braked, and the rotation of the wire winding drum 7 is decelerated.

  Therefore, the swaying phenomenon (wire runaway) that occurs when the wire 9 (FIG. 4) is wound at a high speed is caused by the above-described action in the speed reduction structure 10 of the present invention. Since the drum 7 is braked and the rotation speed is reduced, the speed of the wire 9 to be swung is also reduced, and the possibility of a serious accident such as an injury coming into contact with a nearby worker is reduced. Alleviated.

  In other words, the speed reduction structure 10 uses the centrifugal force to relieve the winding operation of the wire 9 with respect to the winding operation of the mainspring 6 and functions by the occurrence of a predetermined high-speed rotation to function the winding speed. The invention is based on the structure and action that should be called a centrifugal clutch.

  FIG. 5 is a side sectional view for explaining the clutch operation at the time of high speed rotation in the speed reducing structure of the wire sensor of the present invention. 6 is a cross-sectional view of the main part of FIG. In the speed reduction structure 10 of the present invention, the above-described “urging by elasticity” in the clutch shoe portion 3 can be configured by the elastic structure 5 provided in the clutch shoe portion 3. The elastic structure 3 is provided so as to pull the clutch shoe portion 3 in the circumferential direction of the rotary shaft 2. As the elastic structure 5, for example, a sufficient effect can be obtained by using a spring.

  The clutch shoe portion 3 is provided with at least two end portions, and the elastic structure 5 is provided by connecting between the adjacent end portions, or as shown in the figure, the clutch shoe portion. 3 is provided with at least two shoe members 3a, 3b, etc., and the elastic structure 5 can be any one of the configurations provided by connecting the shoe members 3a-3b, 3b-3c, etc. . Hereinafter, the latter configuration will be described.

  6 and 3 show a configuration in which the shoe member 3a and the like, each of the concave structure related thereto, and the convex structure as the engaging portion that engages with the shoe member 3a are provided in three pieces. The number is not limited. These are examples. Similarly, the number of concave structures provided for one shoe member 3a and the like, and the shape of the concave structure and the convex structure are not limited to the illustrated example.

  With such a configuration, when the rotary shaft 2 is rotating at a normal rotational speed, the shoe members 3a and the like constituting the clutch shoe portion 3 have elastic structures 5, 5,... That connect the shoe members 3a and the like. In a state in which the rotary shaft 2 is urged by tension (FIG. 3), when a certain rotational speed is exceeded, the centrifugal force becomes larger as shown in FIG. The clutch shoe portion 3 moves in the centrifugal direction and comes into contact with the clutch case 4 so that the above-described braking is performed.

  Further explanation will be repeated in accordance with the example shown in FIGS. The three clutch shoe members 3a, 3b, and 3c constituting the clutch shoe portion 3 are connected to each other by elastic structures 5, 5, and 5 by springs, and with respect to the rotary shaft 2 formed in a trifurcated shape by a convex structure. And are elastically biased. The shoe member 3a and the like have a concave structure that engages with the convex structure.

  When the wire (9) is cut and wound by the action of the mainspring (6) and the rotational speeds of the wire take-up drum 7 and the rotary shaft 2 are increased, the clutch shoe portion 3, that is, each shoe member 3a is caused by its own weight and centrifugal force. Etc. move in the centrifugal direction (outside).

  When a predetermined rotational speed designed in advance is reached, the clutch shoe portion 3 (the shoe member 3a and the like) comes into contact with the clutch case 4, and the rotational operation is weakened. That is, the clutch becomes effective. However, when the rotational operation is weakened and the rotational speed becomes a predetermined value or less, the clutch shoe portion 3 (the shoe member 3a and the like) returns to the centripetal direction (inner side), and thus leaves the clutch case 4 and returns to the clutch released state.

  Thereafter, the contact / release of the clutch is repeated, and the wire is wound up without causing a dangerous high rotation state. It should be noted that it is possible to appropriately set and design the rotational speed at which the clutch is effective according to the product specifications and the like.

  In addition, a method for preventing the rotation speed of the wire sensor from being increased when the wire is cut by the speed reduction structure 10 described above, and the wire sensor itself provided with the speed reduction structure 10 are also within the scope of the present invention. is there.

  According to the wire sensor, the speed reduction structure thereof, and the rotation speed prevention method of the present invention, even when the wire is cut and wound, the wire is hardly swung, and the risk of an accident is effectively reduced or prevented. be able to. Therefore, the invention is highly industrially applicable in this field and all related fields.

DESCRIPTION OF SYMBOLS 1 ... Wire winding drum axis | shaft 2 ... Rotary shaft 3 ... Clutch shoe part 3a, 3b, 3c ... Shoe member 4 ... Clutch case 5 ... Elastic structure 6 ... Spring spring 7 ... Wire winding drum 8 ... Sensor 9 ... Wire 10 ... Wire sensor deceleration structure

Claims (10)

A speed reduction structure in a wire sensor for detecting a moving distance and a speed of a moving body, a rotating shaft coaxial with a wire winding drum, a clutch shoe portion provided around the rotating shaft, and the clutch shoe portion A clutch case that is provided on the outer side of the clutch case and is provided with an engaging portion that engages with the clutch shoe portion. The clutch shoe portion is elastically attached to the rotary shaft. A speed reducing structure for a wire sensor in which the rotating shaft is braked by contacting the clutch case when it is energized and exceeds a certain rotational speed. The said engaging part is a convex structure provided on the said rotating shaft, The concave structure engaged with this convex structure is provided in the said clutch shoe part, The Claim 1 characterized by the above-mentioned. Wire sensor deceleration structure. The said convex structure is provided in the centrifugal direction of the said rotating shaft, The deceleration structure of the wire sensor of Claim 2 characterized by the above-mentioned. The wire sensor deceleration structure according to any one of claims 1 to 3, wherein the urging by the elasticity is performed by an elastic structure provided in the clutch shoe portion. 5. The wire sensor deceleration structure according to claim 4, wherein the elastic structure is provided so as to pull the clutch shoe portion in a circumferential direction of the rotating shaft. The speed reduction structure of the wire sensor according to claim 4 or 5, wherein the elastic structure is a spring. The wire according to any one of claims 4 to 6, wherein the clutch shoe portion has at least two ends, and the elastic structure is provided by connecting the adjacent ends. Sensor deceleration structure. The wire sensor according to claim 4, wherein the clutch shoe portion includes at least two shoe members, and the elastic structure is provided by connecting the shoe members. Deceleration structure. A method for preventing the rotation speed of a wire sensor from being increased by suppressing the speed of rotation when the wire is cut by the speed reducing structure according to claim 1. A wire sensor comprising the speed reducing structure according to claim 1.

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