JPH06323386A - Chain type speed doubling device - Google Patents

Abstract

PURPOSE:To provide a maintenance-free chain type speed doubling device excellent in maintainability with such constitution as to automatically absorb the extended part of a chain generated during use. CONSTITUTION:In a chain type speed doubling device for moving a carrier plate 4 with the stroke quantity double the stroke quantity of an operating cylinder 1 by the driving of the operating cylinder 1, the carrier plate 4 is connected to a chain 5 stretched between a pair of sprockets 6 equipped at an LM guide 2 connected to the operating cylinder 1, and both ends of the chain 5 are fixed to a movable rod 9 built in a fixed part 3. The movable rod 9 is energized by a compression coil spring 11 to impart tension to the chain 5, and the extended part of the chain 5 generated during use is absorbed by the coil spring 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chain type double speed device incorporated in a transfer robot used in the field of FA.

[0002]

2. Description of the Related Art First, the structure of a conventional chain type speed doubler will be described with reference to FIG. In the figure, 1 is an operating cylinder, 2 is an LM guide which is connected to the operating cylinder 1, and is slidably guided and supported by a fixed portion 3.
Is a carrier plate on which a work gripping hand mechanism (not shown) is mounted. The carrier plate 4 is connected to the circumference of the chain 5, and the chain 5 is provided with a pair of left and right sprockets 6 mounted on the LM guide 2. While stretching between
Both ends of the chain 5 are fixed to the support plate 7 installed on the fixing portion 3. Reference numeral 8 is a guide roller for the chain 5.

With this structure, the LM is operated by the operation cylinder 1.
When the guide 2 is moved in the direction of arrow P, the transport plate 4 interlocks with this and moves laterally of the LM guide 4 via the chain 5 as indicated by arrow Q. In this case, if the moving stroke amount of the LM guide 2 is S, the moving stroke amount of the transport plate 4 is 2S. That is, the LM guide 2
The stroke is amplified and moved twice as much.

[0004]

By the way, in the above-mentioned chain type double speed device, the chain 5 stretches and loosens during long-term use, which causes backlash to smoothly move the transport plate 4. Can't do it. For this reason, conventionally, when the double speed device is regularly inspected or the like, the attachment position of the sprocket 6 is manually moved to readjust the tension of the chain 5 to absorb the extension of the chain.

However, such a manual adjustment work of the chain is troublesome, and this is a cause of deterioration of maintainability in terms of maintenance management. The present invention has been made in view of the above points, and an object thereof is to provide a chain type double speed device which solves the above problems and is capable of automatically absorbing the elongation of the chain without maintenance.

[0006]

In order to achieve the above object, the double speed chain device of the present invention is provided with a tension applying means that functions to constantly apply tension to the chain. Further, the tension applying means can be implemented by specifically adopting a spring member or a cylinder.

[0007]

According to the above construction, the tension applying means always pulls the chain so as to apply a predetermined tension, and automatically absorbs the elongation generated in the chain during use. As a result, backlash does not occur, and the transport plate can always be moved and operated in a stable state.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. In the drawings of the embodiments, the same members corresponding to those in FIG. 4 are designated by the same reference numerals. In FIG. 1, both ends of a chain 5 stretched between a pair of left and right sprockets 6 are fixed to a movable rod 9 incorporated in a fixed portion 3,
In addition, the movable rod 9 is supported by a fixed side support guide 10, and a compression coil spring 11 is interposed between the support guide 10 and the movable rod 9 to urge the chain 5 so as to apply a tensile tension. Has been done.

With this structure, the movable rod 9 receives the urging force of the arrow F by the coil spring 11 and pulls both ends of the chain 5, so that tension corresponding to the spring force of the coil spring 11 is applied to the chain 5. Even if the chain 5 stretches during use of the double speed device in this state, the stretched portion is absorbed by the coil spring 11, so that the chain 5 always operates with a predetermined tension applied. This ensures a smooth movement operation of the transport plate 4.

FIG. 2 shows an application example of the embodiment shown in FIG. 1. Instead of the coil spring 11 in FIG. 1, an elastic body 12 such as rubber is provided between the movable rod 9 and the support guide 10. Is inserted in a compressed state. Further, FIG. 3 shows an embodiment of the present invention different from FIGS. 1 and 2,
An air cylinder 13 is connected to the movable rod 9 as a tension applying means, and pressurized air is introduced into the cylinder to apply tension to the chain 5.

Also in the configurations of FIGS. 2 and 3, FIG.
It is clear that the same effect as can be obtained. Instead of the compression coil spring 11 in FIG. 1, the movable rod 9 can be biased by a tension spring.

[0012]

As described above, according to the structure of the present invention, the chain extension is automatically absorbed and the chain is constantly tensioned without any manual work and without maintenance. As a result, the transport plate can be smoothly moved and operated, which facilitates maintenance management for the chain type speed doubler and improves reliability in terms of function and operation.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of a chain type speed doubler according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of main parts of the application example of FIG.

FIG. 3 is a configuration diagram of main parts of an embodiment different from FIG.

FIG. 4 is a plan view showing the configuration of a conventional chain type speed doubler.

[Explanation of symbols]

 1 Operation Cylinder 2 LM Guide 3 Fixed Part 4 Transport Plate 5 Chain 6 Sprocket 11 Compression Coil Spring (Tension Applying Means) 13 Air Cylinder (Tension Applying Means)

Claims (3)

[Claims] 1. A chain-type speed increasing device for moving a conveying plate by doubling the stroke amount of the operating cylinder by driving the operating cylinder, the LM guide being connected to the operating cylinder, and a pair of LM guides mounted on the LM guide. A chain comprising a sprocket, a chain having both ends supported by fixed parts and stretched between sprockets of the LM guide, and a carrier plate connected to the chain, wherein a chain is provided between both ends of the chain and the fixed part. A chain type double speed device, which is provided with a tension applying means that functions to constantly apply tension. 2. A chain type speed increasing device according to claim 1, wherein a spring member is used as the tension applying means. 3. A chain type speed increasing device according to claim 1, wherein a cylinder is used as the tension applying means.