JPH0143858B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire elongation absorption mechanism in a wire drive device. More specifically, the present invention relates to a wire elongation absorption mechanism (hereinafter simply referred to as absorption mechanism) that has been improved to absorb only the permanent elongation of the wire without absorbing the elastic elongation of the wire due to overload.

Conventionally, as a remote control system, two wires 11 and 12 are wired in a tensioned state as shown in FIG. A driven device having a drive device 14 having a pulley 13 wound in a direction, and a movable member 16 provided slidably or rotatably on a guide member 15 or the like and having the other ends of the wires 11 and 12 locked. It consists of a device 17 that winds one of the wires 11, 12 around the pulley 13 and unwinds the other by rotating the pulley 13 in the directions of arrows A and B, thereby moving the movable member 16 in the direction of arrow C or A device (for example, a wind regulator) configured to reciprocate (or rotate) in the D direction is known.

However, normally, wires made of stranded metal wires undergo elastic elongation, which returns to its original state when the tension applied to the wire is removed, and permanent elongation, which does not return to its original state even when the tension is removed. When the latter permanent elongation occurs, the tension applied to the wire is lost,
Furthermore, since play occurs in the wire, the drive device 14
cannot be accurately transmitted to the follower device 17. Therefore, recently in the operation system,
An absorption mechanism capable of absorbing permanent elongation when permanent elongation occurs in the wire, and when used as a wire drive device, automatically absorbing the permanent elongation of the wire during winding drive of the wire. have been proposed (for example, Japanese Patent Application No. 1997-19972 related to the applicant's application, Japanese Patent Application No.
56-96985, patent application No. 56-193979, etc.).

The basic structure of these absorption mechanisms is that the pulley 13 in FIG.
It is divided into two parts, the pulley 3 and the second pulley 4, and each has ratchet teeth 3 on opposing sides.
It is engraved with a and 4a. This one is the first
It has a function of absorbing permanent elongation of the wire by causing the pulley 3 and the second pulley 4 to perform relative rotation only in the direction of absorbing the wire.

However, when such an absorption mechanism is employed as a wire driving device, after the movable member 16 is stopped by the stopper 18, that is, after the winding operation of the first wire 11 is completed, the first pulley is further moved. 3 and the second pulley 4 are rotated relatively, and the first wire 11 (eventually the second wire 1
In some cases, the engagement of the ratchet teeth 3a, 4a progresses to a state where excessive elastic elongation occurs in the teeth (up to 2). Excessive elastic elongation of such a wire has the disadvantage of causing permanent elongation, and also causes bending deflection of the rotating shafts of the pulleys 3, 4 and other members, making it impossible to operate the operating system. .

Therefore, as a result of intensive research to eliminate the above-mentioned drawbacks, the present inventors have developed a casing, a rotatable structure provided within the casing, and a first
A first pulley having ratchet teeth carved therein, a drive means capable of rotationally operating the first pulley, and a first pulley provided rotatably and axially movably within the casing, and provided on the peripheral edge of one side surface of the first pulley. a second pulley in which a second ratchet tooth is carved to mesh with the first ratchet tooth; an elastic member that biases the second pulley toward the second ratchet tooth in the axial direction; A first wire having a terminal secured to an outer periphery of the first wire and unwound from the outer periphery of the first pulley by rotational operation of the driving means in the ratchet engagement direction, and a terminal secured to the outer periphery of the second pulley. ,
and a second pulley wound around the outer periphery of the second pulley by the rotational operation of the driving means in the ratchet engagement direction.
and a wire on the other side of the second pulley,
A first uneven portion is formed in which protrusions and recesses are alternately arranged in an annular shape with a step greater than the engagement depth of the ratchet, and the recess of the first uneven portion is formed on the inner bottom surface of the casing facing the other side surface. A second concavo-convex portion is formed in the second concave portion, in which convex portions and concave portions that can be fitted deeper than the meshing depth of the ratchet teeth are arranged alternately in an annular shape, and the first wire is wound around the first pulley. When the movable member that is locked to the other end of the second wire comes into contact with the stopper, the convex portions of the first concavo-convex portion and the second concave-convex portion face each other in the axial direction, and the axial direction of the second pulley When a wire elongation absorbing mechanism configured to suppress movement is employed as a wire drive device, a novel feature is adopted in which only the permanent elongation of the wire can be absorbed without absorbing the elastic elongation of the wire due to overload. After discovering this fact, we have completed the present invention.

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

FIG. 1 is a perspective view showing an embodiment of the absorption mechanism of the present invention, FIG. 2 is a schematic perspective view showing an embodiment of a remote control system employing the mechanism shown in FIG. 1 as a wire drive device, and FIG. Figures 3 to 5 are the first
FIG. 6 is a perspective view showing an example of the uneven portion of the second pulley according to the present invention, and FIGS. FIG. 6 is a perspective view showing different embodiments of the absorption mechanism.

The embodiment of the mechanism of the present invention shown in FIG. 1 includes a casing 1, a shaft 2 rotatably provided in the casing, a first pulley 3 fitted to the shaft 2 so as to rotate together, A second pulley 4 is provided on the shaft 2 so as to be rotatable and movable in the axial direction. The first pulley 3 and the second pulley 4 are in contact with each other on one side, and a first ratchet tooth 3a and a second ratchet tooth 4a are respectively carved on the periphery of the side surface so as to mesh with each other. ing. The second pulley 4 is the second pulley 4 and the casing 1
The elastic member 5 inserted between the first pulley 3 and the first pulley 3 is biased toward the first pulley 3. Further, on the other side of the second pulley 4, a first annular uneven portion 6 as shown in detail in FIG. 6 is formed.
An annular second uneven portion 7 that can fit into the first uneven portion 6 is formed on the inner bottom surface 1 a of the casing 1 . The uneven parts 6 and 7 are arranged so that the uneven parts 6 and 7 come into contact with each other when the winding operation of the first wire 11 is completed, for example, when the movable member 16 of the remote control system shown in FIG. 2 comes into contact with the stopper 18. The lengths of the wires 11 and 12 (or the position of the stopper 18) are adjusted accordingly. 1st pulley 3
A locking hole 3b is bored in the outer periphery of the first wire 11, and a locking fitting 11a is fixed to the terminal of the first wire 11.
is locked in the locking hole 3b, wrapped 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 11 is wound around the outer circumference of the first pulley 3 is such that when the first pulley 3 is rotated to idle relative to the second pulley 4 (direction B in FIG. 1), the first wire 11 is wound around the outer circumference of the first pulley 3. The direction is such that it is wound around the first pulley. A locking fitting 12a is also fixed to the end of the second wire 12.
is a locking hole 4b bored on the outer periphery of the second pulley.
When the second pulley 4 is rotated so as to idle relative to the first pulley 3 (in Fig. 1, A
direction), the second wire is wound around the second pulley, that is, in the opposite direction to the first wire 11, and is further guided to the outside of the casing 1. Reference numeral 21 denotes a lever fixed to the shaft end of the shaft 2 as a driving means for rotating the first pulley 3.

Next, the wire elongation absorbing mechanism constructed as described above is explained as follows:
The effect when used as a function will be explained.

The driven device 17 shown in FIG. 2 has the same configuration as the conventional driven device (17 in FIG. 9), and includes a guide member 15, a movable member 16 slidably provided on the guide member 15, It has a stopper 18 for stopping the sliding movement of the guide member 16.

First, use the lever 21 to move the first pulley 3 to the arrow A
When the second pulley 4 is rotated in the direction of arrow A, the second pulley 4 also rotates in the direction of arrow A since the ratchet is in the engaging direction. In this case, as shown in FIG. 3, since the second pulley 4 is urged in the direction of arrow E by the elastic member 5, it is separated from the inner bottom 1a of the casing 1, and therefore the second pulley 4 can rotate freely without being hindered by the uneven parts 6 and 7. Thereby, the second wire 12 is wound around the second pulley 4,
The tension of the second wire 12 causes the movable member 16 of the driven device 17 to slide in the direction of arrow C. Note that the first wire 11 is sent out from the first pulley 3 as the first pulley 3 rotates in the direction of arrow A.

As described above, when the lever 21 rotates in the direction of the arrow A, the first pulley 3 and the second pulley 4 rotate together, so the elongation of the wire is not absorbed.

Next, when the lever 21 rotates the first pulley 3 in the direction of arrow B, the wire 1
1 and 12 maintain sufficient tension, the torque is transmitted from the first pulley 3 to the second pulley 4 by the first wire 11, the movable member 16, and the second wire 1.
2, and the second wire 12 is pulled out from the second pulley 4 according to the amount of winding of the first wire 11. As a result, the first pulley 3 and the second pulley 4 rotate simultaneously and do not absorb any further elongation of the wire (for example, elastic elongation of the wire). Note that the first ratchet tooth 3a of the first pulley 3
Since the rotational torque directly transmitted to the second ratchet teeth 4a of the second pulley 4 from
The force pushing in the direction does not overcome the biasing force of the elastic member 5, so the second pulley 4 does not move in the direction of arrow F. Therefore, the uneven portion 6,
7 does not hinder the rotation of the second pulley 4.

When the lever 21 is further rotated in the direction of arrow B after the winding operation of the first wire 11 onto the first pulley 3 is completed by the movable member 16 coming into contact with the stopper 18. Then, the tension of the first wire 11 is no longer transmitted to the second wire 12. Therefore, the torque is transmitted directly from the first pulley 3 to the second pulley 4 by the inclined surfaces of the ratchet teeth 3a, 4a. Receives pressing force in the F direction. However, at that point, the uneven part 6 formed on the other side of the second pulley 4 and the uneven part 7 formed on the inner bottom surface 1a of the casing 1 are in contact with each other (the first 4), the pressing force is supported by the casing 1, and the second pulley 4 is
Unable to move in any direction. Therefore, the second
Only the rotational component of the force directly received from the first pulley 3 acts effectively on the pulley 4, and the first pulley 3
At the same time, the wire rotates only slightly in the direction of arrow B, and absorption of the elastic elongation of the wire is prevented.

Next, when the lever 21 rotates the first pulley 3 in the direction of arrow B, the wire 1
When permanent elongation occurs in wires 1 and 12, the force is transmitted from the first pulley 3 to the second pulley 4 through the wire 1.
1, 12, but directly through the inclined surfaces of the ratchet teeth 3a, 4a. Therefore, before the winding operation of the wire 11 to the first pulley 3 is completed, for example, when the movable member 16 is sliding in the direction of arrow D, the second pulley 4 is moved from the shaft received from the first pulley 3. While being pressed in the direction of arrow F by a component force in the direction, it is rotationally driven in the direction of arrow B together with the first pulley 3 by a component force in the rotational direction.
Therefore, the uneven portion 6 of the second pulley 4 is
When the second pulley 4 rotates to a position where it can fit into the uneven portion 7 (within a quarter turn in this embodiment), the second pulley 4
moves in the direction of arrow F (see Fig. 5), and the ratchet teeth 3a and 4a climb over each other to reach the first position.
Pulley 3 and second pulley 4 rotate relative to each other. Therefore, the wires 11, 12 depending on the rotation angle
The permanent elongation is absorbed by being wound around the first pulley 3.

In the above embodiment, if the load on the movable member 16 differs depending on the sliding direction, a balance spring 31 as shown in FIG.
is housed in a cavity 32 formed in the second pulley 4, and a boss 34 with both ends of the balance spring 31 protruding from the inner wall surface 33 of the cavity 32 of the second pulley 3 and the inner bottom surface 1a of the casing 1, respectively. The second pulley 4 is moved in the direction of arrow A by engaging the surface of
It is preferable to bias the lever in the same direction, thereby making it possible to equalize the load and reduce the lever operating force.

Further, the wire elongation absorbing mechanism of the present invention can be used not only in the case where the first pulley 3 and the second pulley 4 are in direct contact as in the above embodiment, but also in the case where the first pulley 3 and the second pulley 4 are in direct contact as shown in FIG. It can also be adopted in a case where the two pulleys 4 are indirectly meshed with each other by the idle gears 41 and 42.

The shapes of the uneven parts 6 and 7 in the present invention are preferably formed as fan-shaped protrusions 6a and 7a arranged at equal intervals on the circumference as shown in FIGS. The protrusion end surfaces 6b and 7b can surely come into contact with each other,
A braking function can be provided to stop the rotation of the second pulley 4 when the elongation of the wire is absorbed.

Further, it is preferable that the end surfaces 6b, 7b are formed in a tapered shape, thereby making it easier for the uneven portions 6, 7 to fit into and separate from each other.

Furthermore, the uneven portion 7 of the casing 1 in the present invention
In addition to being directly engraved on the inner bottom surface 1a of the casing 1, it is also possible to use a circular plate with uneven parts that can be fixed to the inner bottom surface 1a of the casing 1 at any angle. Adjustment to bring the convex portions into contact with each other at the end of the operation becomes easy.

As mentioned above, the wire elongation absorbing mechanism of the present invention has the remarkable effect of selectively absorbing only the permanent elongation without absorbing the elastic elongation of the wire due to overload, and its practical value is It is extremely large.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the absorption mechanism of the present invention, FIG. 2 is a schematic perspective view showing an embodiment of a remote control system employing the mechanism shown in FIG. 1 as a wire drive device, and FIG. Figures 3 to 5 are the first
FIG. 6 is a partially cutaway side view showing different operating states of the embodiments shown in the figures; FIG. 6 is a perspective view showing an embodiment of the uneven portion of the second pulley in the present invention; FIG.
8 are perspective views showing different embodiments of the absorption mechanism of the present invention, and FIG. 9 is a perspective view of a remote control system employing the conventional absorption mechanism. (Main symbols in the drawings), 1: casing, 3: first pulley, 3a: first ratchet tooth, 4: second pulley, 4a: second ratchet tooth, 5: elastic member,
6: First uneven portion, 7: Second uneven portion, 11: First wire, 12: Second wire, 15: Guide member, 1
6: Movable member, 18: Stopper, 21: Lever.

Claims (1)

[Claims] 1. A casing, a first pulley rotatably provided within the casing and having first ratchet teeth carved on the peripheral edge of one side surface, a driving means capable of rotationally operating the first pulley, and the casing. a second pulley rotatably and axially movable within the pulley and having second ratchet teeth carved on the periphery of one side surface to mesh with the first ratchet teeth; an elastic member that biases toward the second ratchet tooth in the axial direction; and an end thereof that is locked to the outer periphery of the first pulley; a first wire that is unwound from the second pulley; and a second wire that has an end locked on the outer periphery of the second pulley and that is wound around the outer periphery of the second pulley by rotation of the driving means in the ratchet engagement direction. a first uneven portion in which convex portions and concave portions are alternately arranged in an annular shape with a step greater than the meshing depth of the ratchet is formed on the other side of the second pulley, and the casing faces the other side. A second uneven part is formed on the inner bottom surface of the first uneven part, in which protrusions and recesses are alternately arranged in an annular shape and can fit into the recess of the first uneven part deeper than the meshing depth of the ratchet teeth. When the wire is wound around the first pulley and the movable member that is locked to the other ends of the first wire and the second wire comes into contact with the stopper, the convex portions of the first uneven portion and the second uneven portion are aligned with each other. facing in the direction,
A wire elongation absorbing mechanism configured to suppress movement of a second pulley in the axial direction.