JP2019016497A - Rotary connector device - Google Patents

Abstract

To provide a rotary connector device including a rotation regulation mechanism of simple structure capable of rotation larger than 1 lap and capable of limiting the turning angle.SOLUTION: A rotary connector device obtains electrical connection of rotary members rotating relatively around a revolving shaft while winding or unwinding a flat harness around the revolving shaft having one fixed end. The rotary connector device includes first and second circular disks freely rotatable relatively while aligning the medial axis with the rotational axis and facing the principal surfaces, first and second fixed side stoppers are provided at different positions in the radial direction on the opposite side of the first circular disk, a movable side stopper movable freely in the radial direction is provided on the opposite side of the second circular disk, any one of the first and second circular disks is fixed to the revolving shaft, and the movable side stopper moves in the radial direction by rotating the first and second circular disks relatively and is made movable between a first position abutting on the first fixed side stopper and a second position abutting on the second fixed side stopper.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a rotary connector device for obtaining an electrical connection between members that rotate relatively around a rotating shaft, and in particular, the rotary connector device can rotate more than one turn and limit the rotation angle within a certain range. The present invention relates to a rotary connector device having a small and simple structure.

  There is a rotary connector device as a device for obtaining electrical connection between relatively rotating members and transmitting signals and electric power. In such an apparatus, there is known an energizing rotation mechanism that rotates a rotating shaft while energization is ensured, for example, a slip ring by sliding of a brush or a liquid metal such as mercury instead of a brush. On the other hand, there is also a device in which the members can be rotated relatively while being connected with lead wires. For example, an easily deformable lead wire such as a flat cable is loosely wound in a spiral shape and rotated within a deformable range of the lead wire in both the tightening direction and the loosening direction.

  For example, Patent Document 1 discloses a brushless transmission device used for connection with a lead wire between a steering side and a vehicle body side of an automobile. In such a device, the current rotation angle is notified to the assembly operator of the transmission device to the steering, and the transmission device is assembled by adjusting the rotation angle of the transmission device to the steering whose rotation angle is limited. The rotation angle is limited to a certain range. While the rotational speed display piece is relatively rotatable with a spiral groove formed on the plate surface of one of the two housings that are relatively rotatably combined as a guide, It is possible to move only in the radial direction by a restriction guide provided in the other housing that prevents movement in the circumferential direction. Thereby, the rotation speed from 0 to 5 rotations, that is, the rotation angle is displayed depending on the position in the radial direction.

  In the rotation connector device connected by the lead wire, there is also proposed one provided with a rotation restriction mechanism for restricting the rotation angle so as not to receive an excessive burden beyond the deformable range of the lead wire. Yes.

  For example, Patent Document 2 discloses a rotary joint for an industrial robot used in a clean room as a rotary connector device that can automatically limit a rotation angle by incorporating a stopper. The stopper pin provided in the fixed body is inserted into the arc-shaped groove provided in the stopper attached to the rotating body, and the relative rotation angle between the rotating body and the fixed body is relative to the stopper pin in the stopper groove. The movement range is limited to 360 degrees.

  Further, Patent Document 3 discloses a steering roll connector device for an automobile as a rotary connector device having a mechanism capable of restricting the rotation angle while further increasing the rotation angle from 360 degrees per rotation. The fixed case and the movable case are each provided with a cam plate orthogonal to the rotation axis, and one cam plate includes a discontinuous circumferential groove, an arc groove having a different radius corresponding to the discontinuous portion, a discontinuous circumferential groove and an arc groove. Radial linear grooves that connect both ends are formed. The other cam plate is formed with a zigzag groove meandering between two virtual circles having radii corresponding to the discontinuous circumferential groove and the arc groove. In addition, a stopper ball is provided which is simultaneously engaged with the grooves of the two cam plates and is movable along the grooves of the two cam plates along with the relative rotation of the two cam plates. Since the stopper ball moves along the linear groove between the discontinuous circumferential groove and the arc groove, the zigzag groove also moves at the same time. I can go around. Therefore, the relative rotation can be performed a plurality of times by one cam plate according to the number of times the zigzag groove meanders, and the rotation angle is limited by the stopper ball moved to the end of the zigzag groove. By making the zigzag groove two left and right from the middle point, the left and right two rotations with a slight margin than the left and right two rotations that are the rotation range of the steering wheel of the car and a rotation angle limit of about 90 degrees as a margin It is going to be obtained.

No. 4-554 JP 2003-287173 A Japanese Patent Laid-Open No. 9-35840

  By the way, a rotary connector device of a small machine such as a gaming machine or a toy may be required to have a rotation angle larger than one round (360 degrees), but at the same time, it does not increase the number of parts as much as possible, and a complicated gearbox or the like It is also necessary to combine a simple, lightweight and compact rotation restricting mechanism that does not use a mechanism.

  The present invention has been made in view of the situation as described above. The object of the present invention is to provide a rotation restricting mechanism having a simple structure capable of rotating more than one turn and limiting the rotation angle. It is providing the rotation connector apparatus containing this.

  The rotating connector device according to the present invention obtains an electrical connection between rotating members that rotate relatively around the rotating shaft while winding or unwinding the flat harness around the rotating shaft with one end fixed. And a first and second discs that are rotatable relative to each other with their main surfaces facing each other and having their central surfaces opposed to each other. First and second fixed side stoppers are provided at different positions in the radial direction on the opposite surface side, and a movable side stopper that is movable in the radial direction is provided on the opposite surface side of the second disc, Either one of the first or second disk is fixed to the rotation shaft, and the moving side stopper moves in the radial direction by relatively rotating the first and second disks, The first position contacting the first fixed side stopper Characterized in that it is movable between the second position in contact with the second fixed side stopper and.

  According to this invention, it is possible to rotate more than one turn and limit the rotation angle by a simple structure in which the first and second fixed stoppers that are different in the radial direction and the moving stopper that moves in the radial direction are provided. .

  In the above-described invention, the moving side stopper may be provided at a tip of an arm body pivotally supported by the second disk so as to be rotatable by a rotation axis parallel to the central axis. Good. According to this invention, the moving side stopper can be moved in the radial direction with a simple structure, and can be rotated more than one round, and its rotation angle can be limited.

  In the above-described invention, the first and second fixed side stoppers are termination surfaces on the outer side and the inner side of spiral grooves provided around the central axis on the facing surface of the first disc, respectively. The moving side stopper may be a pin body that is inserted into the groove and moves. According to this invention, it is possible to provide the first and second fixed side stoppers and the movable side stoppers that can come into contact with the first and second fixed side stoppers at positions that are different in the radial direction with a simple structure, and can rotate more than one round. Can limit the rotation angle.

  In the above-described invention, the arm body moves the pin body and the pin body on the facing surface of the second disc when the pin body is moved to each of the first position and the second position. An angle formed by a straight line connecting a central axis and a straight line connecting the pin body and the rotation shaft may be within 90 ° ± 45 °. According to this invention, the rotation can be stopped at a fixed position and the rotation angle can be reliably limited without particularly increasing the rigidity of the material and without particularly reducing the dimensional tolerance.

  In the above-described invention, the first and second disks may be relatively rotatable by a slide bearing. According to such an invention, the rotary connector device can be made compact with a simple structure.

1 is a perspective view of a rotary connector device in one embodiment according to the present invention. FIG. It is a partial exploded perspective view of a rotation connector device. It is a partial exploded perspective view of a rotation connector device. It is a bottom view of the principal part of a rotation connector apparatus. It is a sectional side view of a rotation connector apparatus. It is a bottom view of the principal part which shows operation | movement of a rotation connector apparatus.

  A rotary connector device according to one embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the rotary connector device 10 includes another member in a case formed into a substantially cylindrical body by combining a substantially annular front case 1 and a substantially cylindrical rear case 7 having a bottom surface. This is a device that contains a large number of units. For convenience, the left front side is the top surface side and the right back side is the bottom surface side along the central axis C of the substantially cylindrical body.

  Referring to FIGS. 2 and 3 together, the rotary connector device 10 includes a winding shaft body 2 that is accommodated by projecting a part from the inner peripheral side to the top surface side of the front case 1 as another member. A harness 3 that is partially fixed to the harness 3 and wound around the harness 3, a harness presser 4 for fixing the harness 3 to the winding shaft 2, and a substantially annular body fixed to the rear case 7. An inner ring 5, a stopper disc 6 disposed between the bottom surface of the rear case 7 and the inner ring 5, and a stopper arm 8 attached to the rear case 7.

  Referring to FIG. 1 together with FIG. 2 in particular, the front case 1 includes a top surface portion 11a that forms the vicinity of the outer peripheral side of the top surface of the substantially cylindrical body, a side surface portion 11b that forms the vicinity of the top surface side of the side surface, A hook (A) 12 and a hook (B) 13 extending from the portion 11b are provided. The hooks (A) 12 are engaged with the inner ring 5 and the hooks (B) 13 are engaged with the rear case 7, and are equally distributed at three locations in the circumferential direction. The hook (A) 12 and the hook (B) 13 are rod-shaped bodies having a substantially rectangular cross section extending from the side surface portion 11b toward the bottom surface side, and the outer periphery is inclined by tilting toward the outer peripheral side from the tip toward the top surface. The shape has a barb protruding sideways. Further, the hook (A) 12 is formed slightly thinner than the hook (B) 13.

  As described above, the winding shaft body 2 includes the protruding portion 21 that protrudes from the front case 1 to the top surface side, the disc-like portion 23 that is accommodated on the bottom surface side of the top surface portion 11a of the front case 1, and the bottom surface side thereof. A cylindrical sandwiching portion 26 extending around the central axis C and a small-diameter portion 27 made of a cylindrical body having a smaller diameter than the sandwiching portion 26 and further extending to the bottom surface side. The inner peripheral surfaces of the sandwiching portion 26 and the small-diameter portion 27 are cylindrical surfaces that are continuous from the protruding portion 21, but the outer periphery of the sandwiching portion 26 is not a cylindrical surface, and the harness holder 4 is partially different in thickness. There are irregularities so that the harness 3 can be securely held between the two.

  The disc-like portion 23 has a notch portion in a part of the circumferential direction thereof, and includes a connector holding portion 22 that continuously protrudes from the projecting portion 21 along the notch portion to the top surface side in a wall shape. . The disc-shaped portion 23 includes a ridge 24 having a curved surface with a cross-sectional shape that protrudes toward the top surface in the vicinity of the outer periphery of the top surface, and the ridge 24 contacts the back surface of the top surface portion 11 a of the front case 1. By doing so, the slide rotation with respect to the front case 1 is made smooth. The disk-shaped part 23 also includes a hole 25 into which a protrusion 46 of the harness retainer 4 described later is inserted and engaged.

  The step portion between the small diameter portion 27 and the sandwiching portion 26 is provided with a step portion protrusion 28 for engaging with the stopper disc 6 as will be described later. Further, a small protrusion (not shown) for preventing the sandwiched harness 3 from being displaced is appropriately provided around the sandwiching portion 26.

  The harness 3 includes a spiral portion 31, an inner end portion 32, and an outer end portion 33 that are spirally wound around the sandwiching portion 26 of the winding shaft body 2. The harness 3 is a lead wire such as a flat cable that can be easily wound in a spiral shape, but a flexible flat cable (FFC) or a flexible printed circuit board (FPC) can be suitably used. In particular, it is preferable to have high resistance to repeated bending and stretching, and for example, a high bending FPC is preferable. In this example, a high-bending FPC having a thickness of about 100 μm, in which a 12 μm-thick metal member having a thickness that hardly breaks due to metal fatigue, was covered with a wrapping material having excellent slidability was used.

  The inner end 32 of the harness 3 extends to the top surface along the winding shaft 2 and is connected to the inner connector 34. The inner connector 34 is held by the connector holding portion 22 so that the inner end portion 32 is inserted into the notched portion of the disc-like portion 23 of the winding shaft body 2, and protrudes to the top surface side from the protruding portion 21. In addition, the inner part of the spiral part 31 is appropriately provided with a hole 36 through which the small protrusion of the holding part 26 of the winding shaft body 2 is inserted.

  The outer end 33 extends from the portion of the spiral portion 31 guided to the outer peripheral side through a harness insertion slit 53 and a harness lead-out slit 74 (to be described later) of the inner ring 5 and the rear case 7, and extends toward the bottom surface side. 35 (see FIG. 5). Note that it is preferable that the inner connector 34 and the outer connector 35 have a lock mechanism because the connection work with a machine to be attached can be simplified and connection failures can be reduced.

  The harness retainer 4 includes a substantially cylindrical winding portion 41, a substantially plate-like tongue-like piece 42 extending from the end on the top surface side of the winding portion 41 to the outer peripheral side, and a top surface side from the tongue-like piece 42. A large hook 43 projecting from the right side, and small hooks 44a and 44b on the left and right sides thereof.

  The winding portion 41 is fixed by sandwiching the innermost portion of the spiral portion 31 of the harness 3 between the inner surface thereof and the outer peripheral surface of the holding portion 26 of the winding shaft body 2. The winding portion 41 is provided with a harness insertion slit 45 penetrating from a top surface side to a bottom surface side at a part of the circumference thereof, and the winding portion 41 is inserted through an outer portion of the spiral portion 31 fixed to the harness 3. The remaining part of the spiral part 31 is arranged on the outer peripheral side of the. As a result, the spiral portion 31 of the harness 3 can be wound around or unraveled around the winding portion 41. The winding portion 41 is also provided with a projection 46 protruding to the top surface side, and is inserted into and engaged with the hole 25 of the disc-like portion 23 as described above. The winding portion 41 further includes a small slit 47 that extends along the central axis C from the top surface side as appropriate. The small slit 47 has the tip of the small protrusion of the holding part 26 inserted through the hole 36 of the harness 3 disposed therein, and the small slit 47 is applied to the winding part 41 in combination with the winding shaft body 2. The protrusion is not interfered.

  The tongue-like piece 42 has a shape that fills the cutout portion of the disc-like portion 23 of the winding shaft 2 and is arranged so that the disc-like portion 23 and the surface thereof are continuous. The large hook 43 extending from the tongue-like piece 42 engages with the inner connector 34 and fixes the inner connector 34 so as to press against the connector holding portion 22. The left and right small hooks 44 a and 44 b are engaged with the left and right wall-like portions of the connector holding portion 22 to fix the harness retainer 4 to the winding shaft body 2.

  Referring particularly to FIG. 1 together with FIG. 3, the inner ring 5 includes an annular portion 51 that is a substantially cylindrical body, and a locking portion (A) 52 that protrudes from the annular portion 51 to the outer peripheral side. The annular portion 51 is provided with a harness insertion slit 53 that penetrates from the top surface side to the bottom surface side in a part of the circumference, and is inserted through the vicinity of the outer end portion of the spiral portion 31 to slightly inward from the outer cylindrical surface. The vicinity of the outer end portion of the spiral portion 31 is disposed outside the harness fixing portion 54 having the outer surface shifted to. The harness fixing portion 54 is provided with a projection (not shown) on the outer peripheral side thereof, and is inserted into a hole (not shown) of the harness 3 to prevent the harness 3 from being displaced with respect to the fixing portion 54.

  The locking portion (A) 52 is a gate-shaped protruding portion through which the hook (A) 12 of the front case 1 can be inserted along the central axis C. The hook (A) 12 is engaged by projecting to the outer peripheral side. The locking portions (A) 52 are uniformly distributed at three locations in the circumferential direction.

  The stopper disc 6 is a disc body opened around a through hole 62 along the central axis C, and an engagement recess for engaging the step projection 28 of the winding shaft body 2 on the side surface of the through hole 62. 63. The stopper disk 6 can rotate around the central axis C together with the winding shaft body 2 by engaging the step protrusion 28 with the engaging recess 63. The main surface on the top surface side of the stopper disc 6 is flat, and the main surface on the bottom surface side is provided with a groove 64 formed in a spiral shape (spiral shape) around the central axis C (see FIG. 4). Details of the groove 64 will be described later.

  As described above, the rear case 7 has a substantially cylindrical shape having a bottom surface, and includes a bottom surface portion 71a and a side surface portion 71b. The side surface portion 71b has a stepped shape with a small diameter on the bottom surface side, and the bottom surface portion 71a is brought into contact with the stepped shape on the inner peripheral side of the stepped shape by the end surface on the bottom surface side of the inserted inner ring 5. There is a gap between them. Further, the side surface portion 71b is provided with three windows 72 that allow the locking portion (A) 52 of the inner ring 5 to protrude from the opening end on the top surface side. Moreover, the latching | locking part (B) 73 which protrudes to an outer peripheral side is provided so that it may align with the opening end. The locking portion (B) 73 is a gate-shaped protrusion that allows the hook (B) 13 of the front case 1 to be inserted along the central axis C, and engages the hook (B) 13. The locking portions (B) 73 are also equally distributed at three locations in the circumferential direction.

  The rear case 7 also includes a harness lead-out slit 74 that is a slit extending from the end on the top surface side toward the bottom surface side in the side surface portion 71b, and the spiral outside the harness fixing portion 54 of the inner ring 5 described above. The outer end 33 is led to the outside of the rear case 7 through the portion 31. An accommodation groove 75 for accommodating a protrusion inserted through a hole (not shown) of the harness 3 is formed at a position adjacent to the harness lead-out slit 74 and facing the harness fixing portion 54 of the inner ring 5. The housing groove 75 extends from the end on the top surface side along the central axis C, and prevents the protrusion on the side surface portion 71b from interfering with the inner ring 5 in combination.

  The bottom surface portion 71a of the rear case 7 is provided with a protrusion 76 having a curved surface having a cross-sectional shape that protrudes toward the top surface on the inner surface (surface on the top surface side), and smoothly rotates the stopper disc 6. At the same time, a gap in which the stopper arm 8 can be rotated is secured between the stopper disk 6 and the stopper disc 6. The bottom surface portion 71a further includes a hole for inserting the shaft portion 81 of the stopper arm 8, and pivotally supports the stopper arm 8 so as to be rotatable in a plane perpendicular to the central axis C. In addition, a through hole 77 is provided at the center of the bottom surface portion 71a along the central axis C, and the small-diameter portion 27 of the winding shaft body 2 is rotatably supported with its inner peripheral surface serving as a slide bearing. It is preferable that the rear case 7 be formed of a transparent member because the positional relationship between the stopper arm 8 and the groove 64 and the terminal portions 65 and 66 can be visually recognized and the rotation angle can be grasped. A hole or a window may be provided in the bottom surface portion 71a so that the position of the tip portion of the stopper arm 8 can be visually recognized.

  The stopper arm 8 includes a shaft portion 81 extending toward the bottom surface at one end portion of the arm-shaped main body, and is perpendicular to the central axis C by being pivotally supported by the hole of the top surface portion 71a as described above. It is possible to rotate freely in a plane. The other end is provided with a pin 82 extending to the top surface side. The pin 82 has a substantially cylindrical shape and is slidable along the groove 64 by being accommodated so as to be inserted into the groove 64 of the stopper disc 6.

  As shown in FIG. 4, the groove 64 of the stopper disk 6 is a groove having a substantially square cross section extending spirally around the central axis C provided on the bottom surface of the stopper disk 6. There is approximately 11/4 round from the inner end portion 65 to the outer end portion 66, extending about 1000 degrees as a rotation angle around the central axis C. The groove 64 connects the end portion 65 and the end portion 66 with a constant width and depth, and can retain the pin 82 against the rotation of the stopper disc 6. The spiral shape of the groove 64 is preferably such that the pin 82 slides smoothly. Thereby, even if it is attached to a machine with low torque, it can be operated smoothly. In particular, it is preferable that the end portion 65 and the end portion 66 are end surfaces having a radius of curvature larger than the radius of the pin 82 so that the pin 82 can be smoothly brought into and out of contact with each other. Here, both the terminal portion 65 and the terminal portion 66 are semicircular in diameter with the width of the groove 64 as viewed from the bottom surface side, and have a larger radius of curvature than the side surface of the pin 82.

  Referring to FIG. 5, by combining the members as described above, the front case 1, the inner ring 5 and the rear case 7 are fixed side members, and the winding shaft body 2, the harness retainer 4 and the stopper disk 6 are rotated. As a side member, relative rotation is enabled by a sliding bearing between the through hole 77 and the small diameter portion 27. The vicinity of the outer end 33 and the vicinity of the inner end 32 of the harness 3 are fixed to the fixed side member and the rotation side member, respectively, and the spiral portion 31 of the harness 3 wound in a spiral shape is wound or unwound. The relative rotation of the member and the rotation side member is enabled. Further, as described above, the inner ring 5 has a gap with the bottom surface of the rear case 7, and the outer peripheral portion of the stopper disc 6 is arranged in the gap, and the stopper disc 6 is maintained with this arrangement maintained. Rotate. As described above, the stopper arm 8 is disposed in the gap secured by the protrusion 76 between the bottom surface portion 71a of the rear case 7 and the stopper disc 6, and within a plane perpendicular to the central axis C. It is pivotally supported on the bottom surface 71a so as to be rotatable. In the figure, the stopper arm 8 is not shown because it is disposed on the front side of the sheet.

  Next, the operation of the mechanism for limiting the rotation angle of the rotary connector device 10 will be described with reference to FIG.

  As shown in FIG. 6A, the pin 82 of the stopper arm 8 is accommodated in the groove 64 of the stopper disc 6 so as to be inserted from the bottom surface side. Here, when the stopper disk 6 is turned counterclockwise when viewed from the bottom surface side, the pin 82 moves in a substantially radial direction so as to approach the central axis C along the spiral groove 64, and the shaft portion 81 is centered. The stopper arm 8 is rotated. Further, when the stopper disk 6 is rotated clockwise as viewed from the bottom surface side, the pin 82 moves in a substantially radial direction so as to move away from the central axis C along the groove 64, and the stopper arm 8 is moved around the shaft portion 81. Rotate.

  As shown in FIG. 6B, when the stopper disk 6 continues to be rotated counterclockwise, the pin 82 eventually comes into contact with the inner end portion 65 of the groove 64, and the shaft portion 81 that is pivotally supported by the rear case 7. A reaction force that pushes back the end portion 65 is applied to the pin 82 via the stopper arm 8. As a result, the stopper disc 6 cannot be rotated further counterclockwise. That is, the rotation angle is limited. Here, when the stopper disc 6 is rotated clockwise, the rotation is not limited, and the pin 82 is separated from the terminal end portion 65.

  Further, as shown in FIG. 6C, when the stopper disk 6 continues to rotate clockwise, the pin 82 eventually comes into contact with the outer end portion 66 of the groove 64, and the shaft portion that is pivotally supported by the rear case 7. A reaction force that pushes back the end portion 66 is applied from 81 to the pin 82 via the stopper arm 8. As a result, the stopper disc 6 cannot be rotated further clockwise. That is, the rotation angle is limited. Here, when the stopper disk 6 is rotated counterclockwise, the rotation is not limited, and the pin 82 is separated from the terminal end 66.

  6B, when the pin 82 is brought into contact with the inner terminal portion 65, a straight line L1 that connects the central axis C and the pin 82, and a straight line L2 that connects the pin 82 and the shaft portion 81, The angle formed by is preferably less than 135 degrees. Since the force pushing the pin 82 by the end portion 65 acts in a direction substantially perpendicular to the straight line L1, the force can be decomposed into a force pushing the shaft portion 81 and a force rotating the stopper arm 8 clockwise. Here, if the above-described angle is large, the force in the direction in which the stopper arm 8 is rotated increases, resulting in instability such as widening the rotation angle limited depending on the rigidity and dimensional tolerance of the material. Therefore, by reducing the angle, the rigidity of the material is not particularly increased, and the dimensional tolerance is not particularly decreased. The rotational angle can be surely limited at the position.

  6C, when the pin 82 is brought into contact with the outer terminal portion 66, a straight line L1 connecting the central axis C and the pin 82 and a straight line L2 connecting the pin 82 and the shaft portion 81 are obtained. Is preferably greater than 45 degrees. Similarly, most of the force that pushes the pin 82 by the terminal portion 66 is used as the force that pushes the shaft portion 81, so that the rotation angle can be reliably limited at a predetermined position. That is, it is preferable that the stopper arm 8 is made long in a range where it can be rotated in the apparatus, and the distance between the pin 82 and the shaft portion 81 is increased.

  As described above, the groove 64 has a rotation angle of about 1000 degrees from the inner end portion 65 to the outer end portion 66, and is within a range of rotation angles limited by the stopper disc 6 and the stopper arm 8. The stopper disk 6 is rotated. The rotation angle limited by changing the spiral shape of the groove 64 to change the position of the terminal portion can be changed as appropriate. However, the range of the limited rotation angle is set to be within a range in which an excessive burden is not applied to the harness 3 wound or unwound around the winding portion 41 of the harness presser 4.

  As described above, according to the rotary connector device 10, the stopper disc 6 including the end portions 65 and 66 at different positions in the radial direction as a fixed side stopper, and the stopper including the pin 82 moving in the radial direction as a moving side stopper. With a simple structure in which the arm 8 is provided, it is possible to rotate more than one round and limit the rotation angle. With such a simple structure, the rotary connector device 10 can be reduced in size.

  In the present embodiment, a screwless structure that does not use a screw can be obtained by making the structure locked by the hook (A) 12 and the hook (B) 13, etc., which also contributes to downsizing. Yes. Moreover, the dimension of the harness 3 which is wound and deform | transformed so that it can unwind can be made small by making the harness 3 into thin high bending FPC as mentioned above. Further, by adopting the FPC, it is possible to appropriately set the width of the harness 3 in accordance with the current value of the machine to be attached, and this also contributes to downsizing. Thus, as described above, the cylinder formed by the front case 1 and the rear case 7 can be reduced to a diameter of 40 mm and a height of 22 mm with the rotation angle being about 1000 degrees. Further, the rotary connector device 10 is unitized and can be used with high versatility.

  Instead of the stopper arm 8, the moving side stopper can be constituted by a combination of a sliding groove and a pin body for sliding the pin body inserted into the groove 64 in the radial direction. Further, the groove 64 does not necessarily have a spiral shape. For example, a plurality of circumferential portions having different radii around the central axis C and a linear portion that extends obliquely in the radial direction and connects the circumferential portions to each other. It is also possible to vary the position of the end portion in the radial direction by using a combination shape.

  So far, representative embodiments and modifications based thereon have been described, but the present invention is not necessarily limited thereto, and those skilled in the art will understand the gist of the present invention or the scope of the appended claims. Various alternative embodiments and modifications may be found without departing from the invention.

DESCRIPTION OF SYMBOLS 1 Front case 2 Winding shaft body 3 Harness 6 Stopper disk 7 Rear case 8 Stopper arm 64 Groove 65 (inner side) termination part 66 (outer side) termination part 82 Pin

Claims (5)

A rotary connector device for obtaining an electrical connection between rotating members that rotate relatively around the rotating shaft while winding or unwinding a flat harness around the rotating shaft with one end fixed. ,
Including first and second disks that are rotatable relative to each other with the central axis coinciding with the rotation axis and with the main surface facing each other,
First and second fixed side stoppers are provided at different positions in the radial direction on the opposite surface side of the first disk, and are movable in the radial direction on the opposite surface side of the second disk. A moving side stopper is provided, and either one of the first or second disk is fixed to the rotating shaft;
The moving side stopper moves in the radial direction by relatively rotating the first and second discs, and a first position where the moving side stopper abuts on the first fixed side stopper and the second fixed side. A rotary connector device that is movable between a second position in contact with the side stopper.   The said movement side stopper is provided in the front-end | tip of the arm body pivotally supported by the said 2nd disc so that it can rotate with the rotating shaft parallel to the said center axis | shaft. Rotating connector device. The first and second stationary stoppers are outer and inner end surfaces of spiral grooves provided around the central axis on the opposing surface of the first disc, respectively.
The rotary connector device according to claim 1, wherein the moving side stopper is a pin body that is inserted into the groove and moves.   The arm body is a straight line connecting the pin body and the central axis on the facing surface of the second disc when the pin body is moved to each of the first position and the second position. 4. The rotary connector device according to claim 3, wherein an angle formed by a straight line connecting the pin body and the rotation shaft is within 90 [deg.] ± 45 [deg.]. 5. The rotary connector device according to claim 1, wherein the first and second disks are relatively rotatable by a slide bearing. 6.

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