JP3276591B2 - Braking mechanism of non-powered rotating body for conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking mechanism for a non-powered rotating body for a conveyor, in which a braking force acts on the rotating body when the angular acceleration of the rotating body exceeds a certain limit.

[0002]

2. Description of the Related Art Conventionally, in order to limit the speed of articles descending by their own weight to a certain limit or less, a centrifugal force generated at the time of rotation of a roller is used for an inclined free roller conveyor or an inclined rack. A braking mechanism for braking the rotation of the motor is widely used.

In this method, a centrifugal weight that rotates with the rotation of the roller is incorporated in the roller, and the centrifugal force generated by the rotation displaces the centrifugal weight radially outward to brake the roller. However, such a braking mechanism using centrifugal force has a problem in that when the rotation speed of the roller is low, the centrifugal force acting on the centrifugal weight is small, and a sufficient braking force cannot be obtained.

Therefore, in order to solve the above problem, for example, as described in US Pat. No. 3,918,561, the rotation of a roller is transmitted to a centrifugal weight via a planetary gear, thereby centrifuging. A proposal has been made in which the rotation speed of the weight is increased from the rotation speed of the roller so that a braking force can be obtained even when the rotation speed of the roller is low.

[0005]

However, in the structure described in the above-mentioned U.S. Pat. No. 3,918,561, the structure is complicated because a planetary gear is incorporated inside the roller together with a centrifugal weight. As a result, there is a problem that a failure is easily caused and a manufacturing cost is increased.

Accordingly, the present invention solves the above-mentioned problems of the prior art, and when the angular acceleration of the rotating body exceeds a certain limit, the rotation is braked so that even if the rotating speed of the rotating body is small, it is sufficient. It is an object of the present invention to provide a braking mechanism for a non-powered rotating body for a conveyor, which can obtain a high braking force, has a simple structure, has few failures, and can reduce manufacturing costs.

[0007]

To achieve the above object, a braking mechanism for a non-powered rotating body for a conveyor according to the present invention comprises: a rotating body rotatably supported on a fixed shaft; A torsion coil spring wound around the fixed shaft and having one end fixed to the rotating body and the other end fixed to the flywheel, wherein the inner diameter of the torsion coil spring and the fixing are fixed. A gap is provided between the outer circumference of the shaft and the rotating body rotates with respect to the flywheel to twist the torsion coil spring, thereby reducing the inner diameter of the torsion coil spring. Is configured to tighten the fixed shaft to brake the rotating body.

[0008]

In the braking mechanism for a non-powered rotating body for a conveyor according to the present invention, when the rotating body rotates, the torsion coil spring tends to rotate at one end fixed to the rotating body. However, the torsion coil spring has the other end fixed to the flywheel, rotates only at one end due to the inertia of the flywheel in a stopped state, and the torsion coil spring twists due to the relative rotation of the rotating body and the flywheel. The inner diameter decreases with the deformation.

While the angular acceleration of the rotating body is small, the rotation of the rotating body is transmitted to the flywheel via the torsion coil spring, and the inner diameter of the torsion coil spring is only slightly reduced. In this state, there is a gap between the torsion coil spring and the fixed shaft. The rotating body rotates together with the torsion coil spring and the flywheel, and no braking force acts on the rotating body.

If the angular acceleration of the rotating body increases, the torsion coil spring cannot immediately rotate the flywheel due to the inertia of the flywheel, and the inner diameter of the torsion coil spring is greatly reduced. In this state, the inner diameter of the torsion coil spring tightens the fixed shaft, a braking force is generated and the rotating body is braked, and the rotating speed of the rotating body is suppressed to a predetermined limit.

After braking of the rotating body, the torsion coil spring attempts to rotate the flywheel at the other end in proportion to the restoring force. When the flywheel rotates relative to the rotating body, the torsion coil spring, which had previously tightened the fixed shaft, expands the inner diameter, and the braking of the rotating body is released. As long as the rotating body rotates at the same angular acceleration, the braking speed and the release of the braking are repeatedly performed, so that the rotation speed can be suppressed within a predetermined limit.

Further, the braking mechanism of the non-powered rotary body for a conveyor according to the present invention has an actuator for stopping the rotation of the flywheel on the fixed shaft side. By restricting the rotation of the flywheel by the actuator, even if the rotator tries to rotate after the torsion coil spring tightens the fixed shaft, the rotator cannot rotate. Therefore, articles descending on a conveyor or the like can be retained at a predetermined position so as to protect articles ahead of the apparatus from collision of subsequent articles or accumulated pressure.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a braking mechanism of a non-powered rotating body for a conveyor incorporated in a brake roller used for braking a free roller of an inclined free roller conveyor,
2 is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 3 is an exploded perspective view of a braking mechanism of the non-powered rotating body for a conveyor shown in FIG. 2, as shown in these figures. The braking mechanism 1 of the non-powered rotating body for the conveyor is provided between the conveyor frame and the free rollers. The braking mechanism 1 may be provided for all the free rollers, or may be provided for every several free rollers.

First, a braking mechanism 1 for a non-powered rotating body for a conveyor according to the present embodiment comprises a fixed shaft 2 mounted on a conveyor frame F with a nut N, and a bearing 3 coaxially with the fixed shaft 2 so as to be rotatable. A rotator 5 composed of a supported free roller, a flywheel 6 rotatably supported by a bearing 4 concentrically with the fixed shaft 2, and a torsion coil having ends fixed to the rotator 5 and the flywheel 6, respectively. A spring 7 is provided. The free roller 8 has a boss 8a rotatably supported by a bearing 9 inserted into the fixed shaft 2. The free roller 8 has a surface on which rubber 8b for increasing friction is baked.

The rotating body 5 composed of the free roller is fixed to the boss 8a of the free roller 8 by an outer cylinder 10, a screw 11, and an annular rubber 12. The rotating body 5
It has a boss 5a fixed to the bearing 4, a flange 5b whose diameter is enlarged from the boss 5a, and a second boss 5c protruding from the flange 5b toward the free roller 8.
The second boss 5c extends to the outer peripheral surface of the boss 8a of the free roller 8.

The outer cylinder 10 is provided with a flywheel 6
In addition, it surrounds the outer peripheral side of the rotator 5, extends along the outer peripheral surfaces of the flange 5 b and the second boss 5 c of the rotator 5, and extends to the boss 8 a of the free roller 8.
A side wall 10a is formed at the tip of the outer cylinder 10 on the free roller 8 side. The side wall 10a faces the second boss 5c of the rotating body 5 on the boss 8a. An annular rubber 12 such as an O-ring is provided between the side wall 10a and the second boss 5c.

A screw hole 10b is formed in the outer cylinder 10 at a position surrounding the outer periphery of the flange 5b of the rotating body 5. The rotating body 5 has a V groove 5d on the outer periphery of the flange portion 5b. The screw hole 10b is formed in the annular rubber 12 with respect to the V groove 5d.
The annular rubber 12 is axially compressed and deformed by screwing the screw 11.
By doing so, the free roller 8 is fixed to the rotating body 5 by the frictional force of the annular rubber 12.

The rotating body 5 has an axial locking hole 5e in a flange portion 5b and a flywheel 6
Has an axial locking hole 6a. At both ends of the torsion coil spring 7, locking portions 7a and 7b bent in the axial direction are formed. The locking portion 7a at one end is engaged with and fixed to the locking hole 5e of the rotating body 5. The locking portion 7b at the other end is engaged with and fixed to the locking hole 6a of the flywheel 6. The fixed shaft 2 has a large diameter portion 2 a having a diameter slightly smaller than the inner diameter of the torsion coil spring 7. When the torsion coil spring 7 is in a natural state, there is a slight gap between the inner diameter of the torsion coil spring 7 and the outer circumference of the large diameter portion 2a, and the torsion coil spring 7 freely rotates with respect to the large diameter portion 2a. I can do it.

Pins 14 and 15 are provided on the facing surface of the flange 5b of the rotating body 5 and the flywheel 6, respectively.
Is protruding. The pins 14 and 15 are connected to the braking mechanism 1
At the time of stop, the rotating body 5 and the flywheel 6 do not rotate relative to each other in the direction in which the torsion coil spring 7 is loosened.

Further, the conveyor frame F is provided with an actuator 16 which expands and contracts toward the flywheel 6. When the solenoid 17 is excited by an external signal, the actuator 16
Is pressed. By doing so, the flywheel 6
Is restricted in rotation, and the rotating flywheel 6 is stopped from rotating.

As shown in FIG. 1, when the article W moves downward by its own weight, the free roller 8 is moved by the lower surface of the article W as shown in FIG. When rotated, the rotating body 5
The rotation is transmitted to. The torsion coil spring 7 having one end fixed to the rotating body 5 tends to rotate together with the rotating body 5. The rotation is transmitted from the rotating body 5 to the flywheel 6 through the torsion coil spring 7, but the flywheel 6 does not immediately start rotating due to its inertia, and the torsion coil spring 7 reduces its inner diameter with torsional deformation.

As long as the lowering speed of the article W is small and the free roller 8 in the stopped state rotates for the first time and the angular acceleration acting on the free roller 8 and the rotating body 5 is small, the rotating body 5 rotates through the torsion coil spring 7. And transmitted to the flywheel 6. Then, the rotating body 5, the torsion coil spring 7, and the flywheel 6 rotate substantially synchronously, and the inner diameter of the torsion coil spring only slightly decreases. In this state, the torsion coil spring 7 and the fixed shaft 2
There is a gap between the large diameter portions 2a, and no braking force acts on the rotating body 5.

The rotating body 5 rotates ahead of the flywheel 6, and thereafter, the flywheel 6 rotates by increasing the angular acceleration from the rotating body 5 by the restoring force. The contact prevents torsion of the torsion coil spring 7 in the loosening direction.

When the descending speed of the article W increases and the angular acceleration acting on the free roller 8 and the rotating body 5 for the first time when the free roller 8 in the stopped state increases, the force for twisting the torsion coil spring 7 increases, Due to the inertia of the flywheel 6, the torsion coil spring 7 greatly reduces its inner diameter. Then, there is no gap between the inner circumference of the torsion coil spring 6 and the outer diameter of the large diameter portion 2a of the fixed shaft 2, and the torsion coil spring 6 tightens the large diameter portion 2a. The frictional force generated at this time applies a braking force to the rotation of the torsion coil spring 6, and thus applies a braking force to the rotation of the rotating body 5. Therefore, a braking force is generated also with respect to the rotation of the free roller 8 connected to the rotating body 5, and an increase in the descending speed of the article W is suppressed.

After the lowering speed of the article W is suppressed, the flywheel 8 rotates with respect to the rotating body by the restoring force, and the torsion coil spring 7 rotates in the loosening direction to return the torsion. When the gap returns between the torsion coil spring 7 and the large diameter portion 2a, the braking force of the rotating body 5 is released. Thereafter, the rotating body 5 and the flywheel 6 stop gradually.

When the actuator 16 is pressed against the flywheel 6 to fix the flywheel 6 before the article W descends on the free roller 8, the rotation 5 and the rotation of the free roller 8 are restricted by an external signal. Can be. That is, when the actuator 16 is brought into contact with the flywheel 6, the flywheel 6 is fixed by the frictional force of the pressing force. In this state, when the free roller 8 tries to rotate, the rotating body 5 connected to the free roller 8 twists the torsion coil spring 7, and the torsion coil spring 7 is reduced in diameter by the torsion deformation, so that the torsion coil spring 7 has a large diameter of the fixed shaft. The braking force is generated by tightening the portion 2a.

Therefore, when a plurality of articles are accumulated on the conveyor, the rotation of the flywheel 6 and the rotating body 5 is restrained by the actuator 16 so that each article is stopped on the conveyor, and the articles on the upstream side are stopped. Can be prevented from accumulating pressure and crushing the downstream articles.

When the actuator 16 contracts, the flywheel 6 becomes rotatable, and the torsion coil spring 7
Is loosened, and a gap is formed between the large diameter portion 2a of the fixed shaft 2 and the torsion coil spring 7, so that the braking force is released.

In each of the embodiments described above, the present invention is used as a braking mechanism for keeping the descending speed of articles descending by their own weight on a non-powered conveyor using free rollers arranged at an inclination within a certain limit. However, the rotating body may be configured as a rotating drum or an intermediate support roller that supports the belt of a non-powered belt conveyor, and may be used as a braking mechanism for controlling the descent speed of articles descending by running the belt by its own weight. it can.

[0030]

According to the braking mechanism of the non-powered rotating body for a conveyor according to the present invention, the lowering acceleration of the article and the lower angular acceleration acting on the rotating body cause the connection between the torsion coil spring and the rotating shaft. There is a gap, and the braking force does not work on the rotating body. When the descending acceleration of the article is large and the angular acceleration acting on the rotating body is large, the torsion coil spring tightens the fixed shaft due to the inertia of the flywheel to generate a braking force. After the lowering speed of the article is suppressed, the flywheel rotates with respect to the rotating body due to the restoring force, a gap returns between the torsion coil spring and the rotating shaft, and the braking force of the rotating body is released. And the braking mechanism of the non-powered rotating body for a conveyor according to the present invention does not need to incorporate a centrifugal weight, a planetary gear, or the like unlike the conventional one, and has few failures, and is easy to manufacture and assemble, thereby lowering the manufacturing cost. be able to. Further, since the structure is simplified, the size can be reduced as compared with the conventional one.

Further, by providing the actuator, the rotation of the flywheel and the rotating body is restrained, the descent of the article W is stopped by an external signal, and the pressure of the article on the upstream side does not cause the pressure loss of the article on the downstream side. In this way, protection of a soft article can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example in which a braking mechanism for a non-powered rotating body for a conveyor according to the present invention is used for a free roller conveyor.

FIG. 2 is a longitudinal sectional view showing a braking mechanism of a non-powered rotating body for a conveyor according to the present invention.

FIG. 3 is an exploded perspective view of FIG. 2;

[Explanation of symbols]

 F Conveyor frame N Nut W Article 1 Non-powered rotating body braking mechanism for conveyor 2 Fixed shaft 2a Large diameter section 5 Rotating body 5a Boss 5b Flange section 5c Second boss section 5d V-groove 5e Locking hole 6 Flywheel 6a Locking hole 7 Torsion coil spring 7a Locking portion 7b Locking portion 8 Free roller 8a Boss portion 8b Rubber 10 Outer cylinder 10a Side wall 10b Screw hole 11 Screw 12 Ring rubber 14, 15 pin 16 Actuator 17 solenoid

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-104979 (JP, A) JP-A-57-160808 (JP, A) JP-A-51-124283 (JP, A) JP-A-49-108 125772 (JP, A) Japanese Utility Model 4-119964 (JP, U) Japanese Utility Model 3-96439 (JP, U) Japanese Utility Model 52-162873 (JP, U) Japanese Patent Publication 52-48392 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 59/00 B65G 13/075

Claims (2)

(57) [Claims] A rotating body rotatably supported by a fixed shaft; a flywheel rotatably supported by the fixed shaft; winding around the fixed shaft, one end of which is fixed to the rotating body; A torsion coil spring having an end fixed to the flywheel; a gap provided between an inner diameter of the torsion coil spring and an outer periphery of the fixed shaft; and the rotating body rotating and twisting with respect to the flywheel. When the inner diameter of the coil spring is reduced by being twisted, and the gap is eliminated, the torsion coil spring is configured to tighten the fixed shaft to brake the rotating body, for a conveyor. Non-powered rotating body braking mechanism. 2. The braking mechanism for a non-powered rotating body for a conveyor according to claim 1, wherein an actuator for stopping rotation of the flywheel is provided on the fixed shaft side.