JPH07167223A - Push-pull chain guide - Google Patents

Abstract

PURPOSE:To assure operation of a load device in its normal direction and retention of the load device in its appropriate position without causing a buckling on either side in a chain stretching direction by meanderingly forming a chain guide in such a way that an inflexion point is applied to a drawing shape of the chain. CONSTITUTION:A camber is formed to a chain guide 3 which changes its direction toward approximately 90 deg. from a load driving device 1 to a load device 4 in a reverse direction against a curvature so that an inflexion point occurres to a chain 2 by linking with the curvature part to change its direction. In other words, the chain 2 is meanderingly formed in such away that an angle theta between a direct driving part of the chain 2 and a reverse curvature part of the chain 2 which forms a link changing point by linking with the direct driving part is larger than a bending allowable angle alpha occurring due to clearance between respective chain elements 2-1, 2-2 when a pull drive of the chain 2 takes place. Thus, the operation of the load device 4 in a normal direction and retention of the load device 4 in its appropriate position can be assured.

Description

Detailed Description of the Invention

[0001]

[Industrial applications]
The present invention relates to a chain guide that forms a working passage of a chain roller for preventing buckling of the chain, particularly in a load drive device that requires push drive or lock state of the chain in the pressing direction. It is a thing.

[0002]

2. Description of the Related Art The contents of the prior art will be described with reference to FIGS. FIG. 5 shows that the load driving device 1 is connected to the loading device 4 by the chain 2 and both of them are connected by the chain guide 3 to approximately 90 degrees.
It is a schematic view of a main part of an example in which the direction is changed by °, and the chain 2 is operated along a chain guide 3 as is well known. In the configuration of the example, when the load device only needs pull drive, the chain 2 naturally has a structure for pull drive only as shown in FIG. 6 or a buckling prevention projection as shown in FIG. Even the well-known structure for preventing buckling having the portion 2-3 does not cause a problem in its operating condition.

[0003]

However, the conventional configuration as described above includes a problem in a load drive device used for push drive or that requires a lock state in the pressing direction of the chain. . That is, in the above-described pull-only chain of FIG.
As shown in FIG. 7, 1'buckles easily on either side with respect to the chain extension state, so naturally the normal operation cannot be maintained in the forward action of the push action of the load device, or the load device's It becomes difficult to maintain the position.

The buckling prevention chain shown in FIG. 8 having the buckling prevention protrusions 2-3 for preventing the buckling of the above-mentioned pull-only chain generally used for push-driving,
As shown in FIG. 9, buckling on one side of the chain extending direction on the opposite side of the buckling prevention protrusion 2-3 is unavoidable, and the problems it has are virtually the same.

[0005]

In order to solve the above-mentioned problems, a push-pull chain guide according to the present invention has a chain reciprocating portion in which the chain is connected to the straight-moving portion and the straight-moving portion to form an inflection point. Is formed so as to meander such that the angle (: θ) formed by and becomes larger than the bending allowable angle (: α) that appears due to the gap between the chain elements during pull driving of the chain.

[0006]

[Operation] In the structure described above, in a load drive device used for push drive or that requires a locked state in the pressing direction of the chain, without buckling on either side of the chain extending direction, The forward operation of the load device or the proper position of the load device can be maintained.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the load driving mechanism according to the present invention, which is an example in which the load driving device 1 and the load device 4 are turned by approximately 90 ° by a chain 2 connecting them.
A feature of the present invention is that the chain guide 3 that turns from the load driving device 1 toward the load device 4 by approximately 90 ° is connected to the bending portion that changes the direction so that an inflection point is generated in the chain 2. A warp is formed in the opposite direction.

The above-mentioned warp is always shown in FIG.
Will give the force indicated by the white arrow. That is, with respect to the entire chain 2, the action force indicated by the broken white outline arrow shown in FIG. 2 is removed and the action force indicated by the solid white outline arrow in FIG.

In addition, the magnitude of the inverse curve for realizing the inflection point is
A deviation angle θ of the chain 2 with respect to the straight traveling direction is a component such as adjacent chain elements 2-1 forming the chain 2 and a connecting member 2-2 for connecting both chain elements 2-1 and 2-1. It is desirable that the gap 2-4 in the pulled state of the chain 2 (: FIG. 3) be larger than the bending angle: α shown in FIG. 4 in the pushed state based on accuracy.

[0010]

The push-pull chain guide according to the present invention is used in a load drive device that requires a push drive or a lock state in the pressing direction of the chain without adding a special mechanism. There is also an effect that the forward operation of the load device or the proper position of the load device can be maintained without being buckled to the side.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part of an example of a load driving mechanism according to the present invention.

FIG. 2 is a partial view of a chain for explaining buckling avoidance in the example of FIG.

FIG. 3 is an explanatory diagram showing a gap between the chain elements of the example shown in FIG.

4 is an explanatory view of a bending angle: α at the time of chain push in the example of FIG.

FIG. 5 is a schematic view of a main part of an example of a load driving mechanism according to the related art.

6 is a partial schematic diagram of the chain of the example of FIG.

FIG. 7 is an explanatory diagram showing how the chain buckles in the example of FIG. 6;

FIG. 8 is a partial schematic view of a universal buckling prevention chain in the example of FIG.

FIG. 9 is an explanatory diagram showing how the chain buckles in the example of FIG. 8;

[Explanation of symbols]

 1 Load Driving Device 2 Chain 2-1 Chain Element 2-1 'Chain Element of Pull-only Chain 2-2 Connecting Member 2-3 Gap between Chain Elements in Pulled State 2-4 Buckling Prevention Projection 3 Chain Guide 4 load device

Claims (4)

[Claims] 1. A chain guide for connecting a load device and a load drive device to form a chain roller working path of a bendable chain used for push-driving and / or pull-driving the load device, A push-pull chain guide, wherein the chain guide is formed in a meandering shape so as to give an inflection point to the stretched shape of the chain. 2. A bending angle formed by a gap between the chain elements during pull driving of the chain, where an angle (: θ) formed between a straight-moving portion of the chain and a reverse-curving portion of the chain forming an inflection point appears. It is larger than (: α).
Push-pull chain guide described in. 3. The push-pull chain guide according to claim 1, wherein the load device and the load drive device have different operating directions and are installed so that the chain is curved. 4. The push-pull chain guide according to claim 1, wherein the load device and the load drive device have substantially the same operating directions, and the chains are installed so as to extend in the same direction. .