Transmission apparatus between rotary body and fixed body
First Claim
1. A transmission apparatus between a rotary body and a fixed body comprising:
- an outside case having a flange portion and an outer tubular portion,an inside case having a flange portion and an inner tubular portion disposed at the inner circumference side of said outside case and rotatable with respect to said outside case,at least one flat cable with an inner end connected to the outer circumference of the inner tubular portion and an outer end connected to the inner circumference of the outer tubular portion and for exchanging signals between a rotary body and a fixed body, andat least one dummy cable with an inner end connected to the outer circumference of the inner tubular portion and an outer end connected to the inner circumference of the outer tubular portion at different connecting positions from connecting positions of said flat cable in the circumferential direction,said flat cable and said dummy cable forming winding direction inversion portions at portions midway in the longitudinal directions of the cables in the space defined by the outer tubular portion, inner tubular portion, and flange portions and further being wound up and housed so that the respective winding direction inversion portions are at intervals in the circumferential direction,a first stopper member having a projecting portion being provided on said at least one dummy cable near a said connection portion to the inner tubular portion, a first engagement groove housing the first stopper member being formed at the outer circumference of the inner tubular portion, and a first depression portion in which the projecting portion of the first stopper member enters when the first stopper member leaves the first engagement groove being formed at the inner circumference portion of the flange portion of the outside case.
1 Assignment
0 Petitions
Accused Products
Abstract
A transmission apparatus used for transmitting electric signals, optical signals, small power, etc. between a rotary body and a fixed body using a flat cable. The apparatus has dummy cables in addition to the flat cable. At least one dummy cable is provided with a stopper member having a projecting portion which projects to the flange portion side of the outer case. Further, a depression portion in which the projecting portion of the stopper member enters is formed at the inner circumference of the flange portion of the outside case. If the inside case is rotated in the rewinding direction, the projecting portion of the stopper member catches on the peripheral wall of the depression portion before the flat cable is completely rewound and therefore no further rotation is possible. That is, by the present transmission apparatus, it is possible to accurately detect "over rotation in the rewinding direction" without damaging the flat cable and the dummy cables. "Over rotation in the winding direction" can be detected by a similar construction.
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Citations
10 Claims
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1. A transmission apparatus between a rotary body and a fixed body comprising:
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an outside case having a flange portion and an outer tubular portion, an inside case having a flange portion and an inner tubular portion disposed at the inner circumference side of said outside case and rotatable with respect to said outside case, at least one flat cable with an inner end connected to the outer circumference of the inner tubular portion and an outer end connected to the inner circumference of the outer tubular portion and for exchanging signals between a rotary body and a fixed body, and at least one dummy cable with an inner end connected to the outer circumference of the inner tubular portion and an outer end connected to the inner circumference of the outer tubular portion at different connecting positions from connecting positions of said flat cable in the circumferential direction, said flat cable and said dummy cable forming winding direction inversion portions at portions midway in the longitudinal directions of the cables in the space defined by the outer tubular portion, inner tubular portion, and flange portions and further being wound up and housed so that the respective winding direction inversion portions are at intervals in the circumferential direction, a first stopper member having a projecting portion being provided on said at least one dummy cable near a said connection portion to the inner tubular portion, a first engagement groove housing the first stopper member being formed at the outer circumference of the inner tubular portion, and a first depression portion in which the projecting portion of the first stopper member enters when the first stopper member leaves the first engagement groove being formed at the inner circumference portion of the flange portion of the outside case. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A transmission apparatus between a rotary body and a fixed body comprising:
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an outside case having a flange portion and an outer tubular portion, an inside case having a flange portion and an inner tubular portion disposed at the inner circumference side of said outside case and rotatable with respect to said outside case, at least one flat cable with an inner end connected to the outer circumference of the inner tubular portion and an outer end connected to the inner circumference of the outer tubular portion and for exchanging signals between a rotary body and a fixed body, and at least one dummy cable with an inner end connected to the outer circumference of the inner tubular portion and an outer end connected to the inner circumference of the outer tubular portion at different connecting positions from connecting positions of said flat cable in the circumferential direction, said flat cable and said dummy cable forming winding direction inversion portions at portions midway in the longitudinal directions of the cables in the space defined by the outer tubular portion, inner tubular portion, and flange portions and further being wound up and housed so that the respective winding direction inversion portions are at intervals in the circumferential direction, a second stopper member having a projecting portion being provided on the dummy cable near a said connection portion to the inner circumference of the outer tubular portion, a second engagement groove accommodating said second stopper member is formed in the inner circumference of the outer tubular portion, and a second depression portion in which the projecting portion of the second stopper member enters when the second stopper member leaves the second engagement groove is formed in the outer circumference of the flange portion of the inside case. - View Dependent Claims (8, 9, 10)
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Specification