JPH0143857B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mechanism for absorbing elongation of a reciprocating power transmission wire. More specifically, the present invention relates to a wire elongation absorption mechanism that can be suitably employed as a wire drive device that automatically absorbs elongation of a wire.

[Prior Art] Wires have been commonly used as a means of power transmission. This type of wire has low inertia and little power transmission loss, and can be routed freely when used as a control cable with a conduit, so it is particularly suitable for use as a power transmission means for remote control. be done.
In that case, such a wire is often used in a method (pull wire method) in which both ends of the wire are fixed or locked to the movable parts on the operating side and the driven side, respectively, and the operation is performed while always applying a constant tension to the wire. .

However, in a wire made of stranded metal wire or the like, the tension applied to the wire causes elastic elongation that returns to its original state when the tension is removed, and permanent elongation that does not return to its original state even after the tension is removed. When the latter permanent elongation (hereinafter simply referred to as elongation) occurs, the tension applied to the wire is lost and further play occurs in the wire. In such a state, the operation of the operating device (hereinafter referred to as the driving device) cannot be accurately transmitted to the driven device (hereinafter referred to as the driven device). In order to eliminate such problems caused by wire elongation, tension adjustment mechanisms such as a nut-screw system or a tension pulley system have conventionally been employed. However, such a wire tension adjustment mechanism must be adjusted each time the wire stretches, and furthermore, adjustment is troublesome, and adjustment is extremely difficult depending on the installation position of the transmission device. There is a drawback.

Therefore, the elongation absorption mechanism described in Japanese Utility Model Application No. 58-17473 was proposed. This elongation absorption mechanism includes a shaft that is pivotally supported by the casing and can be rotated by a lever, a first pulley that is fitted onto the shaft and has first ratchet teeth carved around the entire circumference of one side. The first pulley is in close contact with the first pulley and is rotatably supported on the shaft so as to be movable in the axial direction. Second ratchet teeth are carved on one side and mesh with the first ratchet teeth, and the other side is provided with second ratchet teeth that mesh with the first ratchet teeth. consists of a second pulley that is cylindrical with a bottom and has a hollow space, and an elastic member for pressing the second pulley against the first pulley, and an engaging member provided on each of the first and second pulleys. The wire is configured to automatically absorb permanent elongation of the wire by winding or unwinding the wire that is locked and wound in the stop hole.

In this elongation absorption mechanism, when the first pulley is rotated in the direction in which the first and second ratchet teeth slide together, if permanent elongation occurs in the wire, that elongation is taken up by the first pulley. , the elongation of the wire can be absorbed.

[Problems to be Solved by the Invention] As described above, although the conventional elongation absorption mechanism described above can absorb the permanent elongation of the wire to a certain extent, it still cannot solve the following problems.

First, since the wire is wound around only one pulley, there is a problem in that the center position of the wire shifts in only one direction each time the elongation of the wire is absorbed. Therefore, it cannot be used for applications such as valve opening and closing, which require an accurate neutral position of the wire.

Second, the amount of wire elongation absorbed is limited to the maximum winding amount of one pulley, so it cannot be applied in fields where the amount of wire elongation is large. For example, in applications such as opening and closing skylights in buildings, the length of the wire is extremely long, and therefore the amount of permanent elongation of the wire is large, but in such fields, the amount of elongation absorption of the wire is insufficient.

Third, if the load applied to the wire is uneven and the elongation absorption action can only be performed in one direction, even if the installation location is symmetrical vertically, horizontally, etc., the structure This has the inconvenience of having to create two types of units that are symmetrical.

For example, a wind regulator for an automobile is assembled using different parts depending on whether it is right-handed or left-handed.

In view of the above-mentioned circumstances, the present invention has been devised to provide a stretch absorbing mechanism that can absorb wire stretch in both directions, has a large amount of stretch absorption, and can be assembled with the same device even when wire stretch can be absorbed only in one direction. The purpose is to provide

[Means for Solving the Problems] The present invention includes a casing, a shaft rotatably provided on the casing, a first shaft rotatably and axially movably provided on the shaft, and a first
a first pulley having ratchet teeth carved therein; a second pulley rotatably and axially movably disposed on the shaft and having second ratchet teeth carved on one side; A third ratchet tooth, which is provided co-rotating with the shaft and meshes with the first ratchet tooth, is carved on one side, and a direction in which the third ratchet tooth meshes with the second ratchet tooth and engages with the third ratchet tooth. a ratchet roller having fourth ratchet teeth engraved on the other side that engage when rotated in the opposite direction; an elastic member that urges the second pulley toward the first pulley; A first wire whose terminal is locked to the outer periphery of the pulley and is wound around the outer periphery of the first pulley, and a first wire whose terminal is locked to the outer periphery of the second pulley and is wound around the outer periphery of the second pulley. The gist of this is a wire elongation absorbing mechanism consisting of a second wire wound in the opposite direction.

In the claims, the rotational direction in which the ratchet teeth engage is the direction of arrow A for the fourth ratchet tooth 7b shown in FIG. The ratchet teeth mean the direction of rotation that reliably transmits torque. Therefore, when rotating in the opposite direction, the ratchet teeth will slide against each other. Further, the shapes of the third and fourth ratchet teeth formed on both sides of the ratchet roller are the same as shown in FIG. 1, for example.

Furthermore, in the claims, the second wire is wound in the opposite direction to the first wire, for example, as shown in FIG. This means that the wires are wound in opposite directions.

Furthermore, in the wire elongation absorption mechanism of the present invention, when a spiral spring having both ends fixed to the second pulley and the casing is housed in the second pulley, the wire is always kept at a constant level due to the load of the driven device. Even if a biasing force is applied, the biasing force can be balanced and the operating force can be reduced, which is preferable.

[Function] In the mechanism of the present invention, when rotating in a certain direction, idling occurs between the ratchet roller and the first pulley, and when rotating in the opposite direction, idling occurs between the ratchet roller and the second pulley. Therefore, it is possible to idle when rotating in either direction.

Therefore, the elongation of the wire can be absorbed during both forward and reverse operations.

[Example] Next, the elongation absorption mechanism of the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic perspective view showing an embodiment of the wire elongation absorption mechanism of the present invention, FIG. 2 is a longitudinal cross-sectional view of the mechanism shown in FIG. 1, and FIG. FIGS. 4 and 5 are longitudinal sectional views showing other embodiments of the mechanism of the present invention, respectively.

In Figures 1 and 2, 1 is a casing;
A shaft 2 is rotatably provided in the casing 1. Reference numeral 3 denotes a first pulley rotatably and axially movably provided on the shaft 2, and a hollow portion 4 is formed in one side surface of the first pulley 3. A first ratchet tooth 3a is carved on the periphery of the bottom surface of the hollow portion 4. As shown in FIG. Reference numeral 5 denotes a second pulley rotatably and axially movably provided on the shaft 2, and one side of the second pulley 5 has a hollow portion opposite to the hollow portion 4 of the first pulley 3. Part 6
is formed. A second ratchet tooth 5a facing oppositely to the first ratchet tooth 3a is carved on the periphery of the bottom surface of the hollow portion 6. Reference numeral 7 denotes a ratchet roller fitted to the shaft 2 so as to rotate together with the shaft 2.
It is arranged in the space formed by the hollow part 6 of. One side of the ratchet roller 7 is carved with third ratchet teeth 7a that mesh with the first ratchet teeth 3a of the first pulley 3, and the other side is carved with second ratchet teeth 7a of the second pulley 5. A fourth ratchet tooth 7b is cut into mesh with the third ratchet tooth 5a and has an engaging direction opposite to that of the third ratchet tooth 7a. Reference numeral 8 denotes an elastic member inserted between the second pulley 5 and the casing 1, and the elastic member 8 urges the second pulley 5 toward the first pulley 3. A wire locking hole 3b is bored in the outer periphery of the first pulley 3, and a locking metal fitting 9b fixed to the end of the first wire 9 is locked in the wire locking hole 3b. The first wire 9 is wound around the outer periphery of the first pulley 3 and further led to the outside of the casing 1. The direction in which the first wire 9 is wound around the outer circumference of the first pulley 3 is determined when the ratchet roller 7 is rotated so as to engage with the first pulley 3 (that is, rotate idly with respect to the second pulley 5). (B direction in FIG. 1), this is the direction in which the first wire 9 is wound around the first pulley 3. The locking metal fitting 10a fixed to the end of the second wire 10 is connected to the second pulley 5.
When the ratchet roller 7 is rotated so as to engage with the second pulley 5 (that is, rotate idly with respect to the first pulley 3). direction A in Figure 1),
The second wire 10 is wound in the direction in which it is wound around the second pulley 5, that is, in the opposite direction to the first wire 9, and is further led to the outside of the casing 1. Note that 11 is a lever fixed to the shaft end of the shaft 2.

Next, the operation of the wire elongation absorbing mechanism constructed as described above will be explained.

The wire elongation absorption mechanism of the present invention is employed as a mechanism for absorbing elongation of a wire wired in a loop shape, and is preferably used as a drive device as described below, but is not necessarily limited to this. Instead, it can also be used, for example, by being attached to the driven device in a system as shown in FIG.

The most preferred method of using the mechanism of the present invention is to use the mechanism as it is as a drive device in a remote control system as shown in FIG. In that system, a drive device 13 and a follower device 14 are connected to two wires 9,1.
0, the forward operation of the reciprocating rotation operation is caused by the tension of one wire, and the return operation is caused by the tension of the other wire. Of course, the two wires 9 and 10 may be a single wire whose direction is changed at the driven pulley 17 used as a driven device, but in the following explanation, one end of each wire is used as the drive device 13. A first wire 9 and a second wire whose other ends are locked to the driven pulley 17 are attached to the first pulley 3 or the second pulley 5 of the absorption mechanism.
The explanation will be made assuming that the wire 10 is two wires.

When the lever 11 is rotated in the A direction, the ratchet roller 7 is also rotated in the A direction, and since the second and fourth ratchet teeth 5a and 7b are in the meshing direction, the second ratchet roller 7 also rotates in the A direction.
Pulley 5 is also rotated in the A direction. However, the first
Since the third ratchet teeth 3a and 7a are in the idling direction, no rotational torque is transmitted to the first pulley 3. Therefore, the first pulley 3 is stopped until the second wire 10 causes the driven pulley 17 to rotate, the first wire 9 is wound around the driven pulley 17, and then the first pulley 3 is rotated by the tension of the first wire 9. At this time, the elastic member 8 functions as a brake for the first pulley 3. Therefore, when the lever 11 is rotated in the direction A, the elongation that occurs in the first and second wires 9 and 10 is absorbed by the excess winding around the second pulley 5.

On the other hand, when the lever 11 is rotated in the B direction, the ratchet roller 7 also rotates in the B direction, and since the first and third ratchet teeth 3a and 7a are in the meshing direction, the first pulley 3 also rotates in the B direction. Since the second and fourth ratchet teeth 5a, 7b are in the idling direction, no rotational torque is transmitted to the second pulley 5. Therefore, the second pulley 5 rotates the first wire 9 to rotate the driven pulley 17, and after the second wire 10 is wound around the driven pulley 17, the second wire 1
It remains stationary until it can be rotated even with zero tension. At that time, the elastic member 8 moves the lever 11 mentioned above to A.
Similarly, when rotating in the direction, the second pulley 5
It functions as a brake against Therefore, when the lever 11 is rotated in the direction B, the first
The elongation occurring in the second wires 9 and 10 is absorbed by the extra winding around the first pulley.

As described above, the elongation absorption mechanism of the present invention can absorb elongation of the wire regardless of the winding direction of the wire, and especially when used as a drive device, the elongation absorption mechanism of the present invention automatically absorbs the elongation of the wire each time the drive device is operated. It has the function of being able to absorb the elongation of.

Note that the shaft 2 can also be driven by a motor. Further, in the above embodiment, the latchet pulley 7 has the hollow part 4 of the first pulley 3 and the second pulley 5.
However, as shown in FIG. 4, the first pulley 3 and the second pulley 5 are arranged between the first and second pulleys 3 and 5 without providing the hollow sections 4 and 6. It may be interposed between the two. In this case, there is an advantage that the rotational drive provided by a drive means such as a motor can be transmitted by using the outer peripheral surface of the ratchet pulley 7.

Next, another embodiment of the mechanism of the present invention will be described.
The wire elongation absorption mechanism shown in Figure 5 is as follows:
It has all the structures of the wire elongation absorption mechanism shown in FIGS. 1 and 2, and also has a second pulley 5.
A cavity 21 is provided on the side surface opposite to the side surface on which the second ratchet teeth 5a are carved, a boss 22 is provided protruding from the casing 1, and an inner wall 21a of the cavity 21 and an outer periphery 22a of the boss 22 are provided. A spiral spring 23, each fixed at both ends, is accommodated in the space 21. In this case, the wires 9,1
When the load on the driven device differs depending on the winding direction of the coil, it is preferable to orient the spiral spring 23 so as to lighten the load. For example, when the mechanism of the present invention is used in a window regulator, By winding up the spring 23 when lowering the window glass, the wire can be rolled in smoothly due to the weight of the window glass, and conversely, when the window glass is raised, the repulsive force of the spring 23 allows the wire to be wound lightly, thereby preventing swirling. The coiled spring 23 functions as a balance spring and therefore has the excellent advantage of being easy to operate with little effort. Furthermore, since the spiral spring 23 also has a brake function for the pulley, it is possible to absorb the elongation more reliably.

[Effect of the invention] The mechanism of the present invention has the following effects.

First, since the wire is wound around both pulleys (the first pulley and the second pulley), the center position of the wire will not shift even if the elongation of the wire is absorbed as long as the wire is used under the same conditions. Therefore, it can be applied to fields where accurate center position must be maintained, such as in valves and pots.

Second, since the wire elongation absorption increases up to the winding amount of two pulleys, it can be applied even in fields where the amount of wire elongation is large. Therefore, even when applied to buildings with long wires, there is no shortage of wire elongation absorption.

Third, even if wire elongation can be absorbed by rotation in only one direction, if the installation location is symmetrical (vertically, horizontally, etc.), exactly the same device can be installed, and parts can be shared. This makes it possible to reduce costs and simplify assembly work.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the wire elongation absorption mechanism of the present invention, FIG. 2 is a longitudinal cross-sectional view of the mechanism shown in FIG. 1, and FIG. FIGS. 4 and 5 are longitudinal sectional views showing other embodiments of the mechanism of the present invention, respectively. (Main symbols in the drawing), 1: Casing, 2: Shaft,
3: first pulley, 3a: first ratchet tooth, 5:
Second pulley, 5a: second ratchet tooth, 7: ratchet roller, 7a: third ratchet tooth, 7b:
4th ratchet tooth, 8: elastic member, 9: first wire, 10: second wire, 23: spiral spring.

Claims (1)

[Claims] 1. A casing, a shaft rotatably provided on the casing, and a first ratchet tooth provided on the shaft so as to be rotatable and movable in the axial direction, and a first ratchet tooth is carved on one side surface. a second pulley rotatably and axially movably disposed on the shaft and having second ratchet teeth carved on one side surface; a second pulley rotatably disposed on the shaft; provided in the first
A third ratchet tooth is engraved on one side and engages the second ratchet tooth when rotated in a direction opposite to the direction of rotation in which the third ratchet tooth engages. a ratchet roller having mating fourth ratchet teeth carved on the other side surface; an elastic member biasing the second pulley and the first pulley; and an end secured to the outer periphery of the first pulley. a first wire wound around the outer periphery of the first pulley, and a second wire having an end locked on the outer periphery of the second pulley and wound around the second pulley in a direction opposite to the first wire. A wire elongation absorption mechanism consisting of 2. The mechanism according to claim 1, wherein the second pulley accommodates a spiral spring whose both ends are fixed to the second pulley and the casing, respectively.