JPH0626185U - Transmission device between rotating body and fixed body - Google Patents

Abstract

(57) [Summary] [Structure] A flat cable 3 wound in a spiral manner so that a winding direction reversal portion is formed in the middle of a space formed by a relatively rotatable inner case 1 and outer case 2.
And a guide ring 4 having a cutout portion through which the winding direction reversal portion of the flat cable passes in a part of the circumferential direction. An annular recess 1c is formed on the inner surface of the flange 1b of the inner case 1, and the ring body 4b of the guide ring 4 is rotatably fitted therein. [Effect] Since it is possible to prevent the axial displacement and inclination of the guide ring, it is possible to obtain a stable rotation state with low rotation resistance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission device between a rotating body and a fixed body, which is used for transmitting an electric signal, an optical signal, a small electric power, etc. between the rotating body and the fixed body.

[0002]

[Prior art]

 5 and 6 show an example of a conventional transmission device between a rotating body and a fixed body. In this transmission device, an inner case 1 and an outer case 2 coaxially arranged are rotatably combined with each other, and a flat cable 3 and a guide are placed in a space formed by the inner case 1 and the outer case 2. It contains the ring 4. The flat cable 3 is wound in a spiral manner so that a winding direction reversal portion 3a is formed midway in the longitudinal direction, the inner end 3b is attached to the inner case 1, and the outer end 3c is attached to the outer case 2.

The guide ring 4 is a substantially C-shaped one having a notch portion 4a through which the winding direction reversal portion 3a of the flat cable 3 passes in a part of the circumferential direction, and includes a ring body portion 4b, an inner pressing piece 4c, and The outer pressing piece 4d is integrally formed. The inner pressing piece 4c presses the flat cable 3 wound around the body portion 1a of the inner case 1, and the outer pressing piece 4d is a flat cable wound inside the outer tubular portion 2a of the outer case 2. Hold down 3.

This device operates as follows. First, from the state shown in FIG. 6, when the inner case 1 is rotated counterclockwise while the outer case 2 is fixed, the flat cable 3 is wound around the inner case 1, so that the winding direction reversal portion of the flat cable 3 is wound. 3a moves counterclockwise, and the guide ring 4 also moves in the same direction. As a result, the flat cable 3 passes through the notch 4a of the guide ring and is wound around the inner case 1. In this way, the inner case 1 can rotate counterclockwise until almost all of the flat cable 3 is wound up on the inner case 1.

Next, when the inner case 1 is rotated clockwise from the state of FIG. 6, the flat cable 3 is sent out by the rotation of the inner case 1, so that the winding direction reversing portion 3a of the flat cable 3 is rotated clockwise. The guide ring 4 also moves in the same direction. As a result, the flat cable 3 passes through the notch 4a of the guide ring and is wound inside the outer case 2. In this way, the inner case 1 can be rotated clockwise until almost all of the flat cable 3 is wound inside the outer case 2.

The transmission device between the rotating body and the fixed body having such a structure has an advantage that a highly reliable transmission line can be configured because there is no sliding connection portion. In addition, if a spiral wound flat cable with the winding direction reversed in the middle of the longitudinal direction is used, it is necessary to obtain the same relative rotation speed as compared with a flat cable wound in one direction in a spiral shape. There is an advantage that the length of the flat cable can be shortened. Further, when the guide ring is used, the slack of the flat cable can be suppressed by the guide ring, so that the trouble due to the slack of the flat cable can be eliminated.

[0007]

[Problems to be solved by the device]

 However, in this type of conventional transmission device, the guide ring is stored so that it can move freely, so it is easy for the guide ring to be misaligned or tilted. Fluctuates and it is difficult to obtain a stable rotation state.

[0008]

[Means for Solving the Problems]

 The present invention provides a transmission device between a rotating body and a fixed body, which solves the above problems, and has a structure in which an inner case and an outer case that are coaxially arranged are relatively rotatable. In combination, a flat cable with a spiral spring wound inside the inner case and outer case to form a winding direction reversal part, with the inner end attached to the inner case and the outer end attached to the outer case. In a transmission device between a rotating body and a fixed body, which accommodates a guide ring having a cutout portion through which the winding direction reversal portion of the flat cable passes in a part of the direction, in the guide ring, It is characterized in that a cylindrical surface contact portion that is rotatable by contacting a cylindrical surface centering on the rotation center axis is provided.

[0009]

[Action]

 With this configuration, the guide ring is constrained by the cylindrical surface of the inner case or the outer case to rotate, so that axial deviation and inclination do not occur, and it is possible to obtain a stable rotational state with low rotational resistance.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show an embodiment of the present invention. Also in this transmission device, an inner case 1 and an outer case 2 coaxially arranged are relatively rotatably combined, and a flat cable 3 and a guide ring 4 are provided in a space formed by the inner case 1 and the outer case 2. The flat cable 3 has a spiral wound shape and has a winding direction reversal part 3a in the middle of the longitudinal direction. The inner end 3b is attached to the inner case 1 and the outer end 3c is attached to the outer case 2. The guide ring 4 has a cutout portion 4a through which the winding direction reversal portion 3a of the flat cable 3 passes, in a part of the circumferential direction, and the ring body portion 4b, the inner pressing piece 4c, and the outer pressing piece 4d. It is the same as the conventional device in that it is composed of.

The feature of this transmission device is that an annular recess 1c into which the ring body 4b of the guide ring 4 is fitted is formed on the inner surface of the flange 1b of the inner case 1, and the ring of the guide ring 4 is fitted into the annular recess 1c. That is, the main body portion 4b is rotatably fitted. As a result, the ring body 4b has its inner peripheral surface 4e and outer peripheral surface 4f constrained to the inner peripheral surface and outer peripheral surface of the annular recess 1c (both are cylindrical surfaces centering on the rotation center axis of the inner case 1). Since it rotates by rotating, it is possible to prevent misalignment and tilt.

Next, FIG. 3 shows another embodiment of the present invention. In this transmission device, an annular recess 1c into which the ring body 4b of the guide ring 4 is inserted is formed on the inner surface of the collar portion 1b of the inner case 1, and the inner peripheral surface 4e of the ring body 4b is connected to the inner peripheral surface of the annular recess 1c. It is slidably contacted with (a cylindrical surface centering on the rotation center axis of the inner case 1), and a groove portion 1d concentric with the annular recess 1c is formed on the inner surface of the annular recess 1c to form a ring main body of the guide ring 4. That is, a ridge portion 4g that enters the groove portion 1d is formed in 4b. Other than that is the same as the above-mentioned embodiment. Even with such a structure, it is possible to prevent the axial displacement and inclination of the guide ring 4.

Next, FIG. 4 shows another embodiment of the present invention. In this transmission device, the outer diameter of the collar portion 1b of the inner case 1 is made smaller than the outer diameter of the ring body portion 4b of the guide ring 4 so that the ring body portion 4b has the function of the collar portion 1b of the inner case 1. , Three or more projections 4h with claws are formed on the upper surface of the ring body 4b, and the inner surface 4j of the projections 4h with claws is the outer peripheral surface of the collar 1b (a cylinder centered on the rotation center axis of the inner case 1). Surface) in sliding contact. Other than that is the same as the above-mentioned embodiment. Even with such a structure, it is possible to prevent the axial displacement and inclination of the guide ring 4. Further, with this structure, the outer diameter of the flange portion 1b of the inner case 1 can be reduced, so that the flange portion 1b is less likely to warp, and rotation failure due to the warp of the flange portion 1b can be prevented.

[0014]

[Effect of device]

 As described above, according to the present invention, in the transmission device between the rotating body and the fixed body, in which the guide ring is housed, it is possible to prevent the guide ring from being misaligned or tilted. Obtainable.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a transmission device according to the present invention.

2 is a cross-sectional view of the device of FIG.

FIG. 3 is a longitudinal sectional view showing another embodiment of the transmission device according to the present invention.

FIG. 4 is a vertical cross-sectional view showing still another embodiment of the transmission device according to the present invention.

FIG. 5 is a vertical cross-sectional view showing a conventional transmission device.

6 is a cross-sectional view of the device of FIG.

[Explanation of symbols]

1: Inner case 1a: Body part 1b: Collar part 1c: Annular recess 2: Outer case 3: Flat cable 3a: Winding direction reversing part 4: Guide ring 4a: Notch part 4b: Ring body part 4c: Inner pressing piece 4
d: Outer pressing piece 4e: Inner peripheral surface of the ring body portion 4b (cylindrical surface contact portion) 4f: Outer peripheral surface of the ring body portion 4b (cylindrical surface contact portion) 4h: Projection with claw 4j: Inner surface of projection 4h with claw ( Cylindrical surface contact part)

Claims (1)

[Scope of utility model registration request] 1. A mainspring winding in which a coaxially arranged inner case and outer case are relatively rotatably combined and a winding direction reversal portion is formed in the space formed in the inner case and outer case. A flat cable having an inner end attached to the inner case and an outer end attached to the outer case, and a guide ring having a cutout portion through which the winding direction reversal portion of the flat cable passes in a circumferential direction are housed. In the transmission device between the rotating body and the fixed body, the guide ring is provided with a cylindrical surface contact portion that is rotatable in contact with a cylindrical surface centering on a rotation center axis of the inner case or the outer case. Transmission device between a rotating body and a fixed body.