JPH065173U - Transmission device between rotating body and fixed body - Google Patents

Abstract

(57) [Summary] [Constitution] In the case where the inner case 1 is rotatable with respect to the outer case 3 and the flat cable 5 and the dummy cable 7 have winding direction reversing portions 5a and 7b in the middle, a guide part 25 is provided in the inner space. To provide. The guide component 25 includes a direction changing guide plate 27, an outer slack suppressing plate 29, and an inner slack suppressing plate 31. [Effect] Even if the flat cable and dummy cable winding direction reversal part is subjected to high temperature heat history, the flat cable and dummy cable are smoothly moved from the inner case 1 side to the outer case 3 side by the guide parts. It will be shifted to, and it will not fall into rotation failure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transmission device between two relatively rotating members used for transmitting electric signals, optical signals, etc. between a rotating body and a fixed body.

[0002]

[Prior art]

 FIG. 7 shows a conventional transmission device between a rotating body and a fixed body. In this transmission device, an inner case 1 and an outer case 3 coaxially arranged are rotatably combined with each other, and a winding direction is provided midway in the longitudinal direction in a space formed by the inner case 1 and the outer case 3. This is a structure in which a spirally wound flat cable 5 having an inversion portion 5a is housed. The inner end 5b of the flat cable 5 is fixed to the inner case 1, and the outer end 5c is fixed to the outer case 3.

This device operates as follows. First, when the inner case 1 is rotated in the direction of arrow A while the outer case 3 is fixed from the state of FIG. 7, the flat cable 5 is wound around the inner case 1, and accordingly, the flat cable 5 is wound. The direction reversing portion 5a moves in the same direction as the arrow A, and the flat cable 5 wound inside the outer case 3 sequentially passes through the winding direction reversing portion 5a and is wound around the inner case 1. 5 is wound on the outer peripheral surface. In this way, the inner case 1 can be rotated in the direction of arrow A until the flat cable 5 is almost completely wound around the inner case 1.

Further, when the inner case 1 is rotated in the direction of the arrow B while the outer case 3 is fixed from the state of FIG. 7, the flat cable 5 on the inner case 1 is unwound, and accordingly, the flat cable 5 is wound. The direction reversing portion 5a moves in the same direction as the arrow B, and the flat cable 5 wound around the inner case 1 sequentially passes through the winding direction reversing portion 5a and is wound inside the outer case 3. It is wound on the inner surface of No. 5. In this way, the inner case 1 can be rotated in the direction of arrow B until the flat cable 5 is almost entirely wound inside the outer case 3.

The transmission device between the rotating body and the fixed body configured as described above has an advantage that a transmission line having high reliability can be configured because there is no sliding connection portion. If a flat cable with the winding direction reversed in the middle of the longitudinal direction is used, the length of the flat cable required to obtain the same relative rotation speed can be reduced compared to a flat cable wound in one direction in a spiral shape. There is an advantage that it can be shortened.

[0006]

[Problems to be solved by the device]

 The transmission device configured as described above causes no particular problem when the inner case 1 is rotated in the direction of arrow A to wind the flat cable 5 around the inner case 1, but the inner case 1 is rotated in the direction of arrow B. The following problems are likely to occur when the flat cable 5 is unwound from the inner case 1 and wound inside the outer case 3.

That is, when the inner case 1 is rotated in the direction of arrow B, the flat cable 5 wound around the inner case 1 may be loosened without the winding direction reversing portion 5a moving in the same direction. When the slack is generated, the slack is accumulated in the internal space, and finally the slack portion interferes with the winding direction reversing portion 5a and becomes unrotatable.

Although the case where the inner case is rotated has been described above, similar problems are likely to occur when the inner case is fixed and the outer case is rotated.

In order to eliminate the above-mentioned troubles, the present inventor has devised the following solution. As shown in FIG. 8, the first solution is to lay a plurality of dummy cables 7 having the same bending elasticity in the same direction as the flat cable 5 and to wind the flat cable 5 and the dummy cable 7 in the winding direction. The inversion parts 5a and 7a are arranged at substantially equal intervals in the circumferential direction. Both ends of each dummy cable 7 are fixed to the inner case 1 and the outer case 3 similarly to the flat cable 5.

In this case, since the flat cable 5 is pressed against the inner case 1 and the outer case 3 by the elastic repulsive force of the winding direction reversal portions 5a and 7a, the flat cable 5 is less likely to loosen, and You can eliminate such troubles. In the case of the structure, a flat cable can be used instead of the dummy cable 7.

The second solution is, as shown in FIGS. 9 and 10, that the planet roll 9 is arranged on the inner peripheral side of the winding direction reversing portion 5 a of the flat cable, and the inner end is fixed to the inner case 1. The flat cable 5 is guided by the guide tape 11 whose outer end is fixed to the planetary roll 9. This utilizes the fact that the movement of the winding direction reversal portion 5a of the flat cable with respect to the rotation of the inner case 1 is almost the same as the movement of the planetary gear with respect to the sun gear in the planetary gear mechanism.

A sun gear 13 is fixed to the inner case 1, a planet gear 17 is fixed to the planet roll 9 via a shaft 15, and an internal gear 19 is fixed to the outer case 3. The planetary gear 17 meshes with both the sun gear 13 and the internal gear 19. The guide tape 11 has substantially the same length as the flat cable 5, and its inner end side is wound around the inner case 1 together with the flat cable 5, and its outer end side is wound around the planetary roll 9. Reference numerals 21 and 23 are upper and lower support plates that orbit the planet roll 9.

In this structure, when the inner case 1 is rotated in the direction of arrow A, the planetary roll 9 moves in the same direction as the winding direction reversing portion 5a of the flat cable while winding the guide tape 11. On the contrary, when the inner case 1 is rotated in the direction of arrow B, the planetary roll 9 moves in the same direction as the flat tape winding direction reversing portion 5a while rewinding the guide tape 11. Therefore, the flat cable 5 is not loosened, and the above-mentioned trouble can be eliminated.

However, it has become clear that the following problems are still present even if the above solution is applied. This is a problem that occurs because the bending of the winding direction reversal portion 5a of the flat cable 5 is fixed by heat. That is, a flat cable has a structure in which a tape-shaped conductor is sandwiched between two plastic films, and is mainly made of a plastic film to have an appropriate bending elasticity, so once exposed to a high temperature, it returns to room temperature. The phenomenon that the shape at high temperature is fixed to the plastic film as it is occurs.

FIG. 11 shows the state of the flat cable 5 when the transmission device is exposed to a high temperature (about 80 ° C.), then returned to room temperature, and the flat cable is taken out from the case and set free. When the flat cable 5 is originally free, it becomes a straight line due to its elasticity, but the flat cable 5 that has been subjected to a high temperature heat history has a fixed shape when it is inside the case as shown in the figure. The "bending die" is attached to the portion that was the winding direction reversing portion 5a. This "bending die" is very strong, unlike "bending guise" in which a flat cable is bent and attached at room temperature, for example, and it cannot be removed by squeezing it with fingers at normal temperature. This "bending die" is elastically held, and even if it is deformed by applying an external force from the state shown in the figure, it will return to the shape shown if the external force is removed. Such a "bending type" similarly occurs in the dummy cable 7 used in the apparatus of FIG. 8, for example.

When the “bending type” is attached to the flat cable and the dummy cable, the following problems occur. That is, FIG. 12 shows a state in which the inner case 1 is slightly rotated in the direction of the arrow B after the apparatus of FIG. In this case, since the winding direction reversal portions 5a and 7a of the flat cable 5 and the dummy cable 7 have "bending dies", even if the inner case 1 is rotated in the B direction, the flat cable 5 and the dummy cable 7 are not rotated. Does not move smoothly from the inner case 1 side to the outer case 3 side through the winding direction reversing portions 5a and 7a, and the winding direction reversing portions 5a and 7a with the "bending dies" move in the B direction as they are. (The position of the winding direction reversal part in the normal case without the "bending die" is as shown by the dotted line).

As a result, the slack of the flat cable 5 and the dummy cable 7 occurs near the winding direction reversing portions 5a and 7a as shown in the drawing, and when the inner case 1 is further rotated in the B direction, the slack is generated. It accumulates and finally falls into the state of being unable to rotate.

Next, FIG. 13 shows that the inner case 1 is slightly rotated in the direction of arrow B after the apparatus shown in FIGS. 9 and 10 is subjected to heat history and the “bending die” is attached to the flat cable 5. Shows the state. In this case, since the winding direction reversing portion 5a of the flat cable 5 has a "bending die", even if the inner case 1 is rotated in the B direction, the flat cable 5 passes through the winding direction reversing portion 5a and the inner case 1 is rotated. The winding direction reversing portion 5a with the "bending die" does not move smoothly from the 1 side to the outer case 3 side and moves in the direction B as it is (the winding direction reversing portion in a normal state without the bending die) The position of is like the dotted line).

As a result, the flat cable 5 wound inside the outer case 3 is loosened as shown in the figure. When the inner case 1 is further rotated in the B direction, the looseness is accumulated, Eventually, it falls into the state of being unable to rotate.

To summarize the above, in the transmission device using the flat cable having the winding direction reversal part in the middle, when the inner case is rotated in the direction in which the flat cable moves from the inner case side to the outer case side, the inner case is rotated. It is possible to prevent the looseness of the flat cable wrapped around the cable from occurring, but if the flat cable has a “bend” due to the high temperature heat history of the transmission device, This means that the flat cable cannot smoothly reverse the winding direction and move from the inner case side to the outer case side, which hinders normal rotation.

[0021]

[The purpose of the device]

 In view of the above problems, an object of the present invention is to provide a transmission device between a rotating body and a fixed body that does not become unrotatable even when a flat cable has a "bending type".

[0022]

[Means for Solving the Problems]

 In order to achieve this object, the present invention combines an inner case and an outer case that are coaxially arranged so as to be rotatable relative to each other, and inserts them in a space formed by the inner case and the outer case in the middle of the longitudinal direction. In the transmission device between the rotating body and the fixed body, which is used as a rotating body and the other is used as a fixed body, A flat cable direction change guide plate is provided on the outer peripheral surface side of the flat cable winding direction reversing portion so as to follow the winding direction reversing portion, and on the inner peripheral surface of the flat cable wound inside the outer case. Along with this, an outer slack suppressing plate is provided to prevent the flat cable from slackening toward the inner peripheral side, and if necessary, it is wound on the outer side of the inner case. Along the outer circumferential surface of the flat cable are, in also in the range, characterized in that a inner slack suppressing plate that Furattoke Buru is prevented from sagging to the outer peripheral side.

[0023]

[Action]

 In this device, the direction change guide plate prevents the winding direction reversal part of the flat cable with the "bending type" from moving from the original position to the rotation direction of the inner case, and the flat cable smoothly changes the winding direction. It works by inverting and moving from the inner case side to the outer case side. The outer slack suppressing plate prevents the flat cable wound inside the outer case from slackening inward and stabilizes the flat cable winding condition, and the flat cable is smoothly fed from the winding direction reversing part. Helps to be Furthermore, the inner slack suppressing plate prevents the flat cable wound on the outside of the inner case from slackening to the outer peripheral side, stabilizes the flat cable winding state, and smoothly feeds the flat cable to the winding direction reversing part. Help to help.

[0024]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. This transmission device is obtained by applying the present invention to the above-described transmission device of FIG. 8, and the same parts as those in FIG. 8 are denoted by the same reference numerals. This device is different from the device shown in FIG. 8 in that the outer surfaces of the flat cable 5 and the dummy cable 7 wound on the inner case 1 and the flat cable 5 and the dummy cable 7 wound on the outer case 3 are different. The guide parts 25 are provided in the spaces defined by the peripheral surface and the winding direction reversing portions 5a, 7a of the flat cable 5 and the dummy cable 7, respectively.

Each guide component 25 includes a direction change guide plate 27, an outer slack suppressing plate 29, and an inner slack suppressing plate 31. The direction changing guide plate 27 is arranged on the outer peripheral surface side of the winding direction reversing portions 5a, 7a of the flat cable 5 and the dummy cable 7, and has a shape along the winding direction reversing portions 5a, 7a. The outer slack suppressing plate 29 has a shape along the inner peripheral surfaces of the flat cable 5 and the dummy cable 7 wound inside the outer case 3, whereby the flat cable 5 and the dummy cable 7 are slackened toward the inner peripheral side. Prevent the. The inner slack suppressing plate 31 has a shape along the outer peripheral surfaces of the flat cable 5 and the dummy cable 7 wound on the outer side of the inner case 1, so that the flat cable 5 and the dummy cable 7 are prevented from loosening toward the outer peripheral side. Block.

It is desirable that the outer peripheral surface of the outer slack suppressing plate 29 has an outer diameter that does not interfere with the flat cable 5 and the dummy cable 7 when they are almost entirely wound inside the outer case 3. . Similarly, it is desirable that the inner peripheral surface of the inner slack suppressing plate 31 has an inner diameter that does not interfere with the flat cable 5 and the dummy cable 7 when they are almost entirely wound on the inner case 1.

The outer slack suppressing plate 29 and the inner slack suppressing plate 31 are elastically arranged on the direction changing guide plate 29 so as to be able to cope with a change in winding diameter due to a change in the number of windings of the flat cable 5 and the dummy cable 7. It may be connected. Making the outer slack suppressing plate 29 and the inner slack suppressing plate 31 elastically displaceable is effective when the flat cable 5 and the dummy cable 7 are wound many times and the inner diameter and outer diameter of the wound state vary greatly. In addition, it is effective for preventing the flat cable 5 and the dummy cable 7 from being loosened by the gap between the flat cable 5 and the dummy cable 7 becoming larger than the flatness of the flat cable 5 and the dummy cable 7. is there.

Each of the guide parts 25 may be separated one by one, or may be integrated by a disc 33 as shown in FIG. 2, but in any case, the guide parts 25 freely move in the circumferential direction. Built to allow.

When the guide parts 25 are integrated by the disc 33, the outer slack suppressing plate 29 and the inner slack suppressing plate 31 are elastically deformed according to the change in the winding diameter of the flat cable 5 and the dummy cable 7. In this case, as shown in FIG. 3, only the direction change plan inner plate 27 may be integrated with the disc 33, and the outer slack suppressing plate 29 and the inner slack suppressing plate 31 may be floated from the disc 33.

The transmission device shown in FIG. 1 does not become unrotatable even when the flat cable 5 and the dummy cable 7 have a “bending die” due to thermal history. The reasons are as follows. At the position shown in FIG. 1, it is assumed that the winding direction reversal portions 5a, 7a of the flat cable 5 and the dummy cable 7 are provided with "bending dies", and the inner case 1 is rotated in the direction of arrow B from this state.

Then, the winding direction reversing portions 5a and 7a try to move in the same direction, but immediately hit the direction changing guide plate 27 and cannot move further than that. In this state, the flat cable 5 and the dummy cable 7 wound on the inner case 1 are fed to the winding direction reversing portions 5a and 7a while the slack is suppressed by the inner slack suppressing plate 31, and the winding direction is The flat cable 5 and the dummy cable 7 are sent out from the inverting portions 5a and 7a to the inner side of the outer case 3 while the slack is suppressed by the outer slack suppressing plate 29. For this reason, even if the flat cable 5 and the dummy cable 7 have a "bent type", the flat cable 5 and the dummy cable 7 smoothly move from the inner case 1 side to the outer case 3 side, and cannot rotate. There will be no fall.

When the inner case 1 is rotated in the direction of arrow A, there is no particular problem as in the conventional case. The inner slack suppressing plate 31 has a relatively small effect and can be omitted.

4 to 6 show another embodiment of the present invention. This transmission device is obtained by applying the present invention to the above-described transmission device of FIGS. 9 and 10, and the same parts as those of FIGS. 9 and 10 are denoted by the same reference numerals. This device is different from the device of FIGS. 9 and 10 in that the outer peripheral surface of the guide tape 11 wound on the inner case 1 and the inner peripheral surface of the flat cable 5 wound on the inner side of the outer case 3 are flat. The guide component 25 is provided in the space defined by the winding direction reversing portion 5a of the cable 5.

The guide component 25 includes a direction changing guide plate 27 and an outer side looseness suppressing plate 29. The direction changing guide plate 27 is arranged on the outer peripheral surface side of the winding direction reversing portion 5a of the flat cable 5, and has a shape along the winding direction reversing portion 5a. Further, the outer slack suppressing plate 29 has a shape along the inner peripheral surface of the flat cable 5 wound inside the outer case 3, and thereby prevents the flat cable 5 from slackening toward the inner peripheral side. The guide part 25 is integrated with the lower support plate 23 (or the upper support plate 21) as shown in FIGS. 5 and 6, and makes an orbital movement together with the planet roll 9.

It is desirable that the outer peripheral surface of the outer slack suppressing plate 29 has an outer diameter that does not interfere with the flat cable 5 when almost all of the flat cable 5 is wound inside the outer case 3. Further, the outer side slack suppressing plate 29 may be elastically connected to the direction changing guide plate 29 so as to cope with a change in the winding diameter due to a change in the number of windings of the flat cable 5. Making the outer slack suppressing plate 29 elastically displaceable allows the gap between the outer slack suppressing plate 29 and the flat cable 5 to be large when the number of windings of the flat cable 5 is large and the inner diameter variation in the wound state is large. This is effective in preventing the flat cable 5 from becoming loose due to becoming too large.

The transmission apparatus shown in FIGS. 4 and 5 does not become unrotatable even when the flat cable 5 has a “bending die” due to thermal history. The reason is as follows. At the position shown in FIG. 4, it is assumed that the winding direction reversing portion 5a of the flat cable 5 has a "bending die", and the inner case 1 is rotated in the direction of arrow B from this state.

Then, the winding direction reversing portion 5a tries to move in the same direction, but immediately hits the direction changing guide plate 27 and cannot move further than that. In this state, the flat cable 5 wound on the inner case 1 is fed to the winding direction reversing portion 5a while the slack is suppressed by the guide tape 11, and the flat cable 5 is fed from the winding direction reversing portion 5a. The slack is suppressed by the outer slack suppressing plate 29, and is fed to the inside of the outer case 3. Therefore, even if the flat cable 5 is provided with a "bending type", the flat cable 5 smoothly moves from the inner case 1 side to the outer case 3 side, and it does not become unrotatable.

When the inner case 1 is rotated in the direction of arrow A, there is no particular problem as in the conventional case. Further, in the case of this device, the guide tape 11 also has a "bending shape", but since the guide tape 11 is forcibly wound and unwound by the planetary roll 9, there is no obstacle to rotation.

When the high temperature heat history is applied to the transmission device more than once, the “bending die” attached to the flat cable at one time almost disappears when heated in the stretched state at the next time. In any case, the "bending type" can be considered as one place for one flat cable.

[0040]

[Effect of device]

 As described above, according to the present invention, even when the transmission device is subjected to high temperature heat history and the flat cable has a "bend type", the flat cable moves from the inner case side to the outer case side at the winding direction reversing part. The smooth transition will be made, and it will not be impossible to rotate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a transmission device between a rotating body and a fixed body according to an embodiment of the present invention.

2 is a perspective view showing an example of a guide component used in the apparatus of FIG.

3 is a perspective view showing another example of the guide component used in the apparatus of FIG.

FIG. 4 is a cross-sectional view showing a transmission device between a rotating body and a fixed body according to another embodiment of the present invention.

5 is a longitudinal sectional view of the device of FIG.

6 is a perspective view showing an example of a guide component used in the apparatus of FIG.

FIG. 7 is a cross-sectional view showing a conventional transmission device between a rotating body and a fixed body.

FIG. 8 is a cross-sectional view showing an example of an improvement plan of a conventional device.

FIG. 9 is a cross-sectional view showing another example of the improvement proposal of the conventional device.

10 is a vertical cross-sectional view of the device of FIG.

FIG. 11 is a perspective view showing a state in which a “bending die” is attached to the flat cable.

12 is a cross-sectional view showing a problem of the device of FIG.

13 is a cross-sectional view showing a problem of the device of FIG.

[Explanation of symbols]

1: Inner case 3: Outer case 5: Flat cable 5a: Winding direction reversing part 7: Dummy cable 7a: Winding direction reversing part 9: Planet roll 11: Guide tape 13: Sun gear 17: Planetary gear 19: Internal gear 25 : Guide component 27: Direction change guide plate 29: Outside slack suppressing plate 31: Inside slack suppressing plate

Claims (2)

[Scope of utility model registration request] 1. A mainspring whose winding direction is reversed midway in the longitudinal direction in a space formed by an inner case and an outer case, wherein an inner case and an outer case coaxially arranged are relatively rotatably combined. In a transmission device between a rotating body and a fixed body, which houses a wound flat cable, wherein one of an inner case and an outer case is used as a rotating body and the other is used as a fixed body, the winding direction of the flat cable is reversed. The direction changing guide plate of the flat cable is provided along the winding direction reversal portion on the outer peripheral surface side of the portion, and the flat cable is wound along the inner peripheral surface of the flat cable wound inside the outer case. A transmission device between a rotating body and a fixed body, characterized in that an outer slack suppressing plate for preventing slackening on the inner peripheral side is provided. 2. The transmission device according to claim 1, wherein an inner slack suppressing plate that prevents the flat cable from being loosened toward the outer peripheral side along the outer peripheral surface of the flat cable wound around the outer side of the inner case. It is characterized by further providing.