JPH0447613Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Industrial Application Field The present invention provides a method for separating a position detector attached to one of a pair of relatively rotating members from the other member. The present invention relates to a position detection device that prevents the rotational position of the input shaft from shifting.

B. Summary of the invention In this invention, a position detector is attached to one of a pair of relatively rotating members, and an input gear that meshes with a fixed gear fixed to the other member is fixed to the input shaft of the position detector. In the position detection device, a support member that rotatably supports the input gear is provided on the other member so as to be rotatable about the axis of the fixed gear, and is removably fitted between the input gear and the input shaft. By providing a coupling for transmitting rotational force and a locking means for locking at least the input gear of the input gear and the input shaft, when the position detector is separated from one member and reattached, It is designed to be easily connected and to prevent deviations in rotational position.

C. Prior Art To detect the rotational position of a rotating body, a position detector is attached to one of a pair of members that rotate relative to each other, an input gear is fixed to the input shaft of the position detector, and an input gear is fixed to the input shaft of the position detector. The input gear is meshed with a fixed gear.

The structure of a conventional position detector is shown in FIG. In the figure, 1 is a fixed member, and 2 is a rotating member rotatably provided on the fixed member 1 via a bearing 3. The fixed member 1 and the rotating member 2 constitute a pair of members that rotate relative to each other. There is. This pair of members is used in a manipulator system.

A position detector 4 is attached to one of the rotating members 2, which is the rotating member 2. That is, a support member 5 having a cylindrical portion 5a is fixed to the rotating member 2, and the input shaft 4a of the position detector 4 placed on the cylindrical portion 5a and the bearing 6 are connected to the inside of the cylindrical portion 5a. A rotatably supported transmission shaft 7 is connected via a coupling ring 9. A first input gear 8 is fixed to the lower end of the transmission shaft 7, and a spring or the like is used between the first input gear 8 and the first input shaft 8 to provide tension in the circumferential direction relative to the first input gear 8. The second input gear 9 is attached in a state where it is applied. The reason why the two input gears are stacked in this manner is to eliminate backlash and accurately detect the rotational position of the rotating member 2. On the other hand, a fixed gear 10 that meshes with both the first input gear 8 and the second input gear 9 is integrally formed in the center of the fixed member 1.

In such a position detection device, when the rotating member 2 rotates with respect to the fixed member 1, the transmission shaft 7 attached to the rotating member 2 revolves around the fixed gear 10, and as a result, a first input that meshes with the fixed gear 10 is generated. The input shaft 4a rotates together with the gear 8 and the second input gear 9, and the rotational position of the rotating member 2 is detected.

D. Problems that the invention aims to solve However, there are the following problems. In the manibrator system, the position detector 4 may have to be separated from the rotating member 2 for maintenance and inspection, and when the supporting member 5 and the rotating member 2 are separated, the fixed gear 10, the first input gear 8, and the second The mesh with the input gear 9 is disengaged. When the fixed gear 10 and the first input gear 8 and the second input gear 9 are to be meshed again after the maintenance inspection is completed, the first input gear 8
There was a problem in that it was difficult to mesh the input gear 9 with the second input gear 9 because tension was applied thereto and it was not visible to the naked eye.

Therefore, an object of the present invention is to provide a position detection device that solves such problems.

E. Means for Solving the Problems In order to achieve the above object, the position detection device of the present invention is configured as follows.

The position detection device has a position detector fixed to one of a pair of members that rotate relative to each other, and an input gear fixed to the input shaft of the position detector and a fixed gear fixed to the other member. It is constructed by interlocking.

Between the input shaft and input gear of this position detector,
A joint consisting of a pair of detachable members is provided, and the joint has one to four fitting portions in the circumferential direction so that relative rotational positions can be easily adjusted. Then, in order to prevent the input gear from disengaging from the fixed gear when the joint is separated by removing the position detector from one member, the support member that rotatably supports the input gear is attached to the fixed gear. It is attached to the other member so that it can rotate freely around its axis. If this continues, there is a high risk that the input gear will rotate when the joint is separated for maintenance and inspection, and a relative rotational position shift will likely occur between the input shaft and the input gear. Therefore, at least a locking means is provided to lock the input gear that is likely to rotate during maintenance and inspection. As for the input shaft, since the position detector is removed, there is little risk of rotation, and it is not necessarily necessary to provide a locking means.

F. Effect Here, a case will be explained in which a locking means for locking the input gear is provided, but a locking means for locking the input shaft is not provided.

When the position detector is removed from one member, the joint that connects the input shaft of the position detector and the input gear is also separated. The input gear is supported by the support member so that it remains in mesh with the fixed member, and the input gear is locked automatically or manually when the coupling is separated.

When the position detector is attached to one member after maintenance and inspection, there is no risk that the input shaft of the position detector will rotate, so the separated joints are coupled together as they are. The coupling of the joint is easy because it is done by fitting, and since the gears are not meshed with each other, there is no deviation in the rotational position of the input gear and the input shaft. After coupling the joint, the input gear is automatically or manually unlocked.

G. Embodiments Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. Note that this embodiment is an improvement of a part of the conventional position detection device, so the same parts are given the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, a joint 15 is provided between the input shaft 4a, the first input gear 8, and the second input gear 9. The joint 15 has the following structure. A columnar part 16 and a flange part 17 are provided at the lower end of the transmission shaft 7, and as shown in FIG. . The cylindrical part 16 has
A slide member 18 having two mutually parallel rods 18a is slidably fitted with the rods 18a inserted into the recess 17a. Also,
A ring-shaped holding member 19 is fitted into the cylindrical portion 16 and is prevented from coming off by a retaining ring 20, and a spring 21 is interposed between the holding member 19 and the slide member 18. on the other hand,
A cylindrical member 23 having a flange portion 22 is disposed below the flange portion 17, and a recess 22a is formed in the flange portion 22 at the same position as the flange portion 17, and a hollow first input gear 8 is provided at the lower end. A second input gear 9 is attached.

The first input gear 8 and the second input gear 9 are fixed gears 1
A support member 24 is provided in order to be able to mesh with the fixed gear 10 and revolve around the fixed gear 10, and to prevent it from falling even when separated from the position detector 4. That is, the fixed gear 10 and the fixed member 1 can be separated, and the support member 24 is rotatably provided around the axis of the fixed gear 10 via a bearing 25, and the supporting member 24 is rotatable about the axis of the fixed gear 10. A bearing 2 is attached to a support shaft 24a that protrudes upward in the figure parallel to the center.
A first input gear 8 is rotatably attached via 6. Therefore, as shown in FIG. 2a, the first input gear 8 and the second input gear 9 can mesh with the fixed gear 10 and revolve around it.

A locking means 26 is provided to lock the first input gear 8 and the second input gear 9. The locking means 26 is comprised of a latch 27 and a push cam 28, as shown in FIGS. 3a and 3b. The latch 27 has a substantially L-shape, and includes a mounting portion 27a for attaching to the support member 24, and an upright portion 2 whose upper portion is bent toward the side opposite to the mounting portion when standing upright.
7b, and a claw portion 27c that projects from the upright portion 27b toward the first input gears 8, 9. In order to prevent the first input gear 8 and the second input gear 9 from rotating in either direction, the latch 27 is attached to both sides of the first input gear 8 and the second input gear 9 as shown in FIG. 3b. Support member 2
It is fixed at 4. On the other hand, the push cam 28 is attached to the cylindrical portion 5a of the support member 5 in a downward direction, and when the support member 5 is attached to the rotating member 2, the push cam 28 is attached to the cylindrical portion 5a of the support member 5. Since the lower end of 28 bends the upright part 27b of the latch 27 to the left, the claw 27c is connected to the first input gear 8,
away from the second input gear 9.

Next, the operation of such a position detection device will be explained.

When the support member 5 is pulled upward and removed from the rotating member 2, the rod 18a is pulled upward from the recess 22a and the joint 15 is separated, so that the first input gear 8 and the second input gear 9 mesh with the fixed gear 10. It will remain as it is. At this time, Figure 3a
Since the push cam 28 shown in FIG.
The claw portion 27c is the first input gear 8 and the second input gear 9.
It engages with and prevents its rotation. Therefore, the first input gear 8 and the second input gear 9 not only do not rotate, but also do not revolve around the fixed gear 10.

After removing the position detector 4 for maintenance and inspection, the support member 5 is lowered toward the rotating member 2, and the two rods 18a are inserted into the recesses 22a.
After the support member 5 is inserted into the rotating member 2, the support member 5 is fixed to the rotating member 2. The fitting between the rod 18a and the recess 22a is 2.
Unlike gears that mesh with each other, there are not many parts that mesh with each other, so the joint 15 can be easily connected without shifting its rotational position. Then, at the same time that the joint 15 is connected, the push cam 28 pushes down the upright portion 27b of the latch 27 from above, so that the claw 27c comes off from the first input gear 8 and the second input gear 9, and the first input gear 8 , the second input gear 9 is in a state where it can freely rotate.

In this way, the first input gear 8, the second input gear 9
is locked by a latch 27, and the flange portion 17 is unlikely to rotate because there is no risk that the input shaft 4a of the position detector 4 will rotate, and therefore the first input gear 8 and the second input gear 9 and input shaft 4
There is no deviation in the rotational position from a.

Next, as other embodiments of the locking means, a locking means 30 is shown in FIGS. 4a and 4b, and a locking means 31 is shown in FIGS. 5a and 5b.

The locking means 30 is constructed as follows. On the upper surface of the support member 24 and near the support shaft 24a,
A guide member 32 having an angular cylindrical portion 32 a and a mounting portion 32 b is attached with screws 33 . The axis of the cylindrical part 32a passes through the axes of the first input gear 8 and the second input gear 9, and a claw 35 is attached to one side of a moving member 34 that is movably housed in the cylindrical part 32a. At the same time, an engaged portion 35a is formed at the upper portion of the claw 35. A spring 37 interposed between the moving member 34 and a receiving plate 36 that closes the hollow portion of the cylindrical portion 32 a is in contact with the other side of the moving member 34 . In order to restrict the movement range of the moving member 34, an elongated hole 38 is formed in the upper part of the cylindrical portion 32a and is elongated in the axial direction, and a pin 39 fixed to the upper surface of the moving member 34 is loosely fitted into the elongated hole 38. has been done.
On the other hand, an engagement member 40 that engages with the engaged portion 35a is coupled to the cylindrical portion 5a of the support member 5 via a bolt 41.

In such a locking means 30, when the supporting member 5 is removed from the rotating member 2, the engaging member 40 is disengaged from the engaged portion 35a, so that the claw is locked together with the movable member 34 by the biasing force of the spring 37. 35 is pressed against the first input gear 8 and second input gear 9, and the first input gear 8 and second input gear 9 are locked. When the supporting member 5 is attached to the rotating member 2, the engaging member 4 resists the biasing force of the spring 37.
0 pushes the engaged portion 35a, the movable member 34 moves within the cylindrical portion 32a, and the pawl 35 separates from the first input gear 8 and second input gear 9, causing the first input gear 8 and the second input gear 9 is unlocked.

The locking means 31 is constructed as follows. A long base 42 is provided on the support member 24 near the support shaft 24a along a straight line passing through the axis of the support shaft 24a.
is fixed on the base 42, and the lower ends of two parallel links 43a and 43b extending in the vertical direction are rotatably connected via pins 45a and 45b, and the upper ends of the links 43a and 43b are The connecting member 4 is rotatably connected via pins 45c and 45d.
Connected by 4. A lock gear 46 is fixed to the link 43b, and a metal fitting 47 having a dogleg-shaped engaged portion 47a is attached to the connecting member 44 via a bolt 48. and,
In order to urge the lock gear 46 toward the support shaft 24a, one end of each spring 49 is connected to the extensions of both ends of the pin 45b, and the other end of the spring 49 is connected to both ends of a rod 50 passing through the center of the link 43a. are combined respectively. On the other hand, an engaging member 5 is attached to the cylindrical portion 5a of the support member 5 in the same manner as shown in FIG. 4a.
1 is attached.

In such a locking means 31, when the support member 5 is removed from the rotating member 2, the engagement member 51 is disengaged from the engaged portion 47a, so that the link 43a is moved by the biasing force of the two springs 49. , 43b rotate clockwise around the pins 45a, 45b in FIG. 5a, and the lock gear 46 meshes with the first input gear 8 and the second input gear 9. is locked. The supporting member 5 is connected to the rotating member 2
When attached to the pins 45a, the engaging member 51 pushes the engaged portion 47a to the left in FIG.
45b, the lock gear 46 separates from the first input gear 8 and second input gear 9, and the first input gear 8 and second input gear 9 are unlocked.

Note that since there is little risk of the input shaft rotating after the position detector is removed, a locking means for locking the input shaft was not provided in this embodiment. Misalignment is reliably prevented.

H. Effects of the invention As explained above, according to the invention, a position detector is attached to one of a pair of relatively rotating members, and the position of the input gear meshing with the fixed gear fixed to the other member is detected. In a position detection device fixed to the input shaft of a device, a supporting member rotatably supporting the input gear is provided on the other member rotatably about the axis of the fixed gear, and a supporting member is provided between the input gear and the input shaft. A joint that transmits rotational force by being removably fitted is provided, and a locking means for locking at least the input gear of the input gear and the input shaft is provided, so that the position detector can be removed from one member. When reinstalling after maintenance and inspection, unlike conventional methods, the joint separates, and at least the input gear, which is easy to rotate, is locked. It never shifts.

[Brief explanation of the drawing]

1 to 5 relate to an embodiment of the position detection device according to the present invention, in which FIG. 1 is a structural diagram thereof, FIG. 2 a is a view taken along the - arrow in FIG. 1, and FIG. of-
A view in the direction of arrows, FIG. 3a is a front view showing the locking means,
Fig. 3b is a view in the direction of - arrow in Fig. 3a, Fig. 4a is a front view showing another embodiment of the locking means, Fig. 4b
5A is a plan view showing another embodiment of the locking means, FIG. 5B is a view in the direction of FIG. FIG. 2 is a structural diagram of a detection device. DESCRIPTION OF SYMBOLS 1... Fixed member, 2... Rotating member, 4... Position detector, 8... First input gear, 9... Second input gear, 10... Fixed gear, 15... Joint, 18a...
...rod, 22a... recess, 24... support member,
24a...Support shaft, 25, 26...Bearing, 27...
...Latch fitting, 28...Push cam, 30, 31...
locking means.

Claims (1)

[Claims for Utility Model Registration] A position detector is fixed to one of a pair of members that rotate relative to each other, and an input gear fixed to the input shaft of the position detector is fixed to the other member. In the position detection device meshed with a fixed gear, the other member is provided with a support member rotatably supporting the input gear while meshed with the fixed gear, the other member being rotatable about the axis of the fixed gear;
A joint is provided between the input gear and the input shaft to transmit rotational force by a pair of members removably fitting each other, and at least the input of the input gear and the input shaft is provided. A position detection device characterized by being provided with a locking means for locking a gear.