JPH0322470Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to automatic doors installed at entrances and exits of buildings.

Prior Art A drive source such as a motor is connected to a drive wheel via a transmission mechanism, and a cable is wound around the drive wheel and the driven wheel.
It is known that a door is connected to this cable and the door is opened and closed by rotating the cable using a drive source.

However, this structure has the problem that vibrations generated by the drive source propagate to the door, making it impossible to open and close the door smoothly.

Therefore, as shown in Japanese Unexamined Patent Publication No. 57-51388, an intermediate annular portion made of a vibration-proof elastic body is provided between a metal inner circumference and a metal outer circumference to form a drive wheel. Automatic doors are known in which vibrations generated at the source are absorbed and relaxed by an intermediate annular portion so that the vibrations do not propagate to the door.

However, with this configuration, the driving force transmitted from the drive source to the drive wheels is supported by the vibration-proof elastic body of the intermediate annular part, so the vibration-proof elastic body of the intermediate annular part itself may be damaged (for example, cracked). , the mounting surface between the vibration-proof elastic body of the intermediate annular part and the metal inner and outer circumferential parts may slip in the relative rotational direction, making it impossible to reliably transmit the driving force to the drive wheels. There is a drawback.

In addition, the cable connected to the door that opens and closes is wrapped around the drive wheel, and when the brake is applied in the middle of opening and closing the door, an inertial shock in the direction of movement acts on the door, and The inertial impact also acts on the cables, causing an unreasonable rotational action to propagate to the drive wheels.

Due to this forced rotation, the vibration isolating elastic body of the intermediate annular portion itself may be damaged as described above, or the vibration isolating elastic body of the intermediate annular portion and the metal inner and outer peripheral portions may be damaged. There is a drawback that the mounting surface may slip in the relative rotational direction, causing damage to the entire transmission mechanism.

The above means that a rotating body is installed between a drive source such as a gear of a transmission mechanism and a driving wheel, and an intermediate annular part made of a vibration-proof elastic body is installed between a metal inner circumference and an outer circumference. This also occurs when the structure is

Purpose of the invention It is possible to attenuate and absorb vibrations in the rotational direction generated by the drive source so that they do not propagate to the door, and also to reliably transmit the driving force, and to reduce inertia when the brake is applied during the door opening/closing operation. The purpose is to attenuate and absorb shock to prevent damage to the transmission mechanism.

Structure of the invention At least one of the driving wheel 14, the intermediate wheel 16, the driving wheel 5, and the gear of the gear reducer 3 is integrally formed with a vibration-proof elastic body, and the inner periphery is attached to the rotating shaft. The outer circumferential portion has a small hardness that allows it to be elastically displaced by a predetermined driving force, and the outer periphery has a large hardness that does not cause elastic displacement by a predetermined driving force.

Embodiment FIG. 1 is a front view showing a part of the drive unit of an automatic door. The drive unit 1 has a drive source (motor) on one side in the longitudinal direction and a gear reducer 3 connected to the drive source 2. A driving wheel 5 is fixed to the output shaft 4 of the gear reducer 3 to constitute a transmission mechanism, and a driven wheel 6 is provided on the other side in the longitudinal direction. A cable 7 such as a belt is wound around the drive wheel 5, and a spring 8 is provided on the cable 7, thereby forming a drive unit for the door.

A guide rail 9 is formed along the lower edge of the drive unit main body 1 in the longitudinal direction, and a pair of hanging door wheels 11 attached to the door 10 are attached to the guide rail 9.
11 is slidably mounted and supported, and the cable 7 and the door 10 are connected by a connector 12.

FIG. 2 is a plan view of the transmission mechanism, in which a driving wheel 14 is mounted on the driving shaft 13 of the drive source 2, and a gear reducer 3 is connected to the driving shaft 13 of the drive source 2.
An intermediate wheel 16 is attached to each of the input shafts 15, and a cable 17 is wound around the intermediate wheels 16 and the driving wheel 14, and the input shaft 15 and the output shaft 4 are connected to each other. A small gear 18 and a large gear 19 meshed with each other are attached respectively.

FIG. 3 is a partially cutaway enlarged view of the drive wheel 5. The drive wheel 5 is almost entirely formed integrally with a vibration-proof elastic body, and the inner peripheral portion 5a has a small hardness that is elastically displaced by a predetermined driving force. Therefore, the outer peripheral portion 5b has a large hardness that will not be elastically displaced by a predetermined driving force, and the annular portion 5c for attachment to the output shaft 4 is a separate member.

Further, as the vibration-proof elastic body, for example, urethane rubber or the like is used, and the hardness of the inner circumferential part 5a is small and the hardness of the outer circumferential part 5b is large. The grooves are formed to engage with the grooves of the timing belt.

Alternatively, the drive wheel 5 made entirely of vibration-proof elastic material may be directly attached to the output shaft 4 without the attachment annular portion 5c.

With the above configuration, the rotation of the driving wheel 14 of the drive source 2 is transmitted to the cable 17, the intermediate wheel 16, the gear reducer 3, the output shaft 4, and the drive wheel 5, and the cable 7 is rotated and the door 10 is rotated. is opened and closed along the guide rail 9 via the hanging door wheel 11.

Furthermore, since the driving wheel 5 is almost entirely formed of a vibration-proof elastic material with varying hardness such that the hardness of the inner circumference part 5a is small and the hardness of the outer circumference part 5b is large, Since the vibratory elastic body has extensibility, it can be elastically displaced in the rotational direction between the inner peripheral part 5a and the outer peripheral part 5b, especially around the inner peripheral part 5a attached to the output shaft 4. Peripheral part 5
Since the inner circumferential portion 5a and the outer circumferential portion 5b are integrally formed, relative slippage in the rotational direction does not occur between the inner circumferential portion 5a and the outer circumferential portion 5b.

For this reason, vibrations in the rotational direction (vibrations with a relatively high frequency) generated in the drive source 2 are transmitted to the drive wheels 14,
Cable 17, intermediate wheel 16, gear reducer 3, output shaft 4
The vibration propagates to the inner peripheral part 5a of the driving wheel 5 through the vibration absorbing material, but is damped and absorbed (absorbed and alleviated) by the elastic displacement of the inner peripheral part 5a made of a vibration-proof elastic body with small hardness, and does not propagate to the outer peripheral part 5b. Only the necessary driving force is transmitted to the outer peripheral portion 5b.

At this time, since the outer peripheral part 5b is a vibration-proof elastic body with high hardness, it easily conforms to the cable 7 wound around it and is difficult to elastically deform, so that the driving force is applied to the cable 7 ( In other words, the power can be sufficiently transmitted to the next-order drive transmission means.

Therefore, the cable 7 is not transmitted with vibration, and the door 10 can be opened and closed smoothly.
The driving force of the drive source 2 can be reliably transmitted to the cable 7, and the door 10 can be opened and closed reliably.

Further, an inertial shock in the direction of movement of the door 10 that occurs when the brake is applied during the opening/closing operation of the door 10 is propagated to the outer peripheral portion 5b of the drive wheel 5 via the cable 7; The impact is received by the outer peripheral part 5b made of a vibration-proof elastic body with high hardness, and the inner peripheral part 5a
Attenuation is absorbed (absorbed and alleviated) by the elastic displacement of the vibration isolating elastic body with low hardness.

Therefore, the transmission mechanism such as the driving wheel 5, gear reducer 3, intermediate wheel 16, and driving wheel 14 will not be damaged due to inertial impact, and the cable 7 will not be damaged due to inertial impact. It will not come off from the driving wheels 6, and the cables 7 will not be cut.

In addition, in the above embodiment, only the drive wheel was formed of a vibration-proof elastic body, but the invention is not limited to this.
Any one, a plurality, or all of the driving wheel 14, the intermediate wheel 16, and the small and large gears 18 and 19 of the gear reducer 3 may be formed from a vibration-proof elastic body.

In this case, the small and large gears 18 of the gear reducer 3,
When the gear 19 is formed of a vibration-proof elastic body, there is an advantage that no meshing sound is generated in the gear meshing portion when the gear is rotated.

FIG. 4 is a partially cutaway front view of another embodiment of the drive wheel 5, in which the hardness of the vibration-proof elastic body of the portion 5'a on the side of the attachment annular portion 5c of the inner peripheral portion 5a is increased; The hardness of the outer circumferential portion of 'a is small, and the hardness of the outer circumferential portion 5b is large.

With this configuration, when the drive wheel 5 is attached to the output shaft 4, it can be attached using the hard portion 5'a, which facilitates the attachment operation.

Effects of the invention: Since vibrations in the rotational direction generated in the drive source 2 can be attenuated and absorbed and prevented from propagating to the cables 7, the door 1
0 can be opened and closed smoothly, and the drive source 2
The driving force is reliably transmitted to the cable 7, and the door 10 can be reliably opened and closed.

Furthermore, the transmission mechanism that damps and absorbs the inertial impact when the brake is applied during the opening/closing operation of the door will not be damaged.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front view showing a part of the automatic door drive unit, FIG. 2 is a plan view of the transmission mechanism, and FIG. 3 is a partially cutaway front view of the drive wheel. FIG. 4 is a partially cutaway front view showing another embodiment of the drive wheel. 2 is a drive source, 3 is a gear reducer, 4 is an output shaft, 5
is a driving wheel, 6 is a driven wheel, 7 is a cable, 10 is a door, 1
4 is the driving wheel, 15 is the input shaft, 16 is the intermediate wheel, 17
is a cable.

Claims (1)

[Scope of utility model registration request] a drive source 2; a driving wheel 14 attached to the drive source 2;
an intermediate wheel 16 driven by the driving wheel 14 via a cable 17; a gear reducer 3 in which the intermediate wheel 16 is attached to the input shaft 15 and the drive wheel 5 is attached to the output shaft 4; In an automatic door equipped with a cable 7 wrapped around a driving wheel 5 and a driven wheel 6, and a door 10 connected to the cable 7, the driving wheel 14, the intermediate wheel 16, the driving wheel 5, and the gear reduction gear 3 are provided. At least one of the gears is integrally formed with a vibration-proof elastic body, the inner circumference attached to the rotating shaft has a small hardness that can be elastically displaced by a predetermined driving force, and the outer circumference has a small hardness that allows elastic displacement by a predetermined driving force. An automatic door characterized by a large hardness that does not cause elastic displacement due to a predetermined driving force.