JPH0989067A - Electricmotordriven linear reciprocating motion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the tension of a belt in an electric-motor-driven linear reciprocating motion device. SOLUTION: A guide rail 13 is provided along the lengthwise direction in a widthwise direction central part of a housing 10, four driven side pulleys 21 to 24 are rotatably provided in a corner part of the housing 10, a timing belt 25 linked to these driven side pulleys 21 to 24 is provided in a manner surrounding the guide rail 13, the timing belt 25 is connected to a slide block 15 slidably provided in the housing 10, so as to drive the timing belt 25 by a motor 26 having a drive side pulley 28. Both end parts of the timing belt 25 are mounted in the slide block 15 by belt mounting fixtures 31, 32, and they are moved, so that the tension of a belt can be easily adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric linear reciprocating device which reciprocates a moving member such as a slide table for supporting a work in a linear direction.

[0002]

2. Description of the Related Art A moving member such as a slide table is linearly reciprocated in order to convey a work from one position to another position or to move a hand or a tool for holding the work between a processing position and a retracted position. Sometimes. This linear reciprocating device is also called a slide unit or slider, and there is a type in which a moving member is driven via a timing belt driven by an electric motor.

[0003]

As such a linear reciprocating device, a slide block is slidably mounted along a guide rail, and the slide block is connected to a belt such as a timing belt. There is a type that is driven by an electric motor.

This belt is attached to the apparatus in the form of a loop, that is, an endless shape. However, considering the manufacture of a plurality of types of linear reciprocating devices in which the reciprocating strokes of the slide blocks are different from each other, the loop is previously formed. The use of the belt formed in not only makes it difficult to manage the parts and cannot improve the manufacturing efficiency, but also increases the manufacturing cost.

Therefore, a belt having a both ends cut by a predetermined length is used, and both ends of the belt are fastened to a slide block to form a loop belt. Therefore, in an electric linear reciprocating device using a belt, it is inevitable to fasten both ends of the belt to the slide blocks.

Heretofore, through holes are formed at both ends of the belt, and screw members are screwed into the screw holes formed in the slide block through the through holes of the belt, so that both ends of the belt are connected to the slide block. Attempts have been made to tighten them, but this method cannot adjust the tension of the belt. Until now, to adjust the tension of the belt, the pulley around which the belt is wound is moved.

It is an object of the present invention to provide an electric linear reciprocating device having a belt capable of adjusting tension.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0009]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

That is, in the electric linear reciprocating device of the present invention, a guide rail extending in the longitudinal direction is provided at the center in the width direction, and a housing having pulleys rotatably provided at both ends thereof, and the guide rail is provided along the guide rail. A slide block slidably provided in the longitudinal direction of the housing, a belt located outside the guide rail and hung around the pulley, and connected to the slide block; and an electric motor for driving the pulley, A screw hole formed in the slide block, having two belt attachments each having a belt fixing portion fixed to an end portion of the belt of a predetermined length and a fastening portion fastened to the slide block. A through hole through which a screw member threadedly connected to is formed in each fastening portion of each of the belt attachments, Characterized in that the elongated hole oriented extending the through hole formed in the fastening portion of the one belt fitting of the belt even without.

In this electric linear reciprocating device, the tension of the belt can be easily adjusted by moving the belt attachment without moving the pulley.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing the outer appearance of an electric linear reciprocating device according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1 with a cover removed, and FIG.
4 is a sectional view taken along line III-III in FIG.
Is a sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 is a perspective view showing a belt attachment.

The electric linear reciprocating device shown in the drawings has a substantially rectangular metal housing 10 which, as shown in FIGS. 3 and 4, has a bottom plate 10.
It is composed of a and side plates 10b and 10c, and has a cup-shaped cross section. Caps 11 and 12 made of resin are fixed to both ends of the housing 10.

As shown in FIG. 2, the bottom plate 10a of the housing 10 is provided with a guide rail 13 at the center in the width direction along the longitudinal direction.
A slide block 15 is fixed to a guide block 14 slidably provided with respect to the slide block 15. Therefore,
The slide block 15 is guided by the guide rail 13 together with the guide block 14 so as to reciprocate in the linear direction.

A cover 16 is attached to the housing 10 for covering the central portion in the width direction thereof, and predetermined gaps 17 and 18 are formed between the cover 16 and the side plates 10b and 10c of the housing 10. There is. The slide block 15 has supporting portions 15a and 15b that protrude upward through the gaps 17 and 18, and directly support the work in this portion, or via a supporting table 19 fixed to the supporting portions 15a and 15b. The work is supported, and the work is conveyed by the slide block 15.

As shown in FIG. 2, a total of four driven pulleys 21 to 24 are provided rotatably in the housing 10, two driven pulleys 21 to 24 at the corners of both ends thereof. The outer peripheral surfaces of 21 to 24 are flat. These driven pulleys 21 to 24 have
The timing belt 25 is hung around, one side is a flat surface, and the tooth portion 25a is formed on the other side. The timing belt 25 has the drive side pulleys 21 to 24 with the side on which the tooth portion 25a is formed as the outside.
Have been hung over. Tooth 2 of the timing belt 25
A part of 5a is shown in FIG. 2, and the tooth portion 25a of the other part is omitted for convenience of drawing.

The timing belt 25 has a predetermined length, and both ends thereof are fastened to the slide blocks 15 to form an endless or endless or loop shape as a whole.

In order to drive the timing belt 25,
As shown in FIG. 4, a motor 26 is attached to the bottom plate 10 a of the housing 10, and a drive side pulley 28 is fixed to a shaft 27 of the motor 26. The drive-side pulley 28 is located in the central portion of the housing 10 in the width direction, and is larger than the two driven-side pulleys 21 and 22 provided at one end of the housing 10 in the housing 10.
Are displaced to the central portion side in the longitudinal direction.

The drive pulley 28 has external teeth 28a as shown in FIG. 4, and the timing belt 25 has a portion protruding from the space between the two driven pulleys 21 and 22 toward the central portion. The pulley 28 is hung around, and the tooth portion 28a of the drive side pulley 28 meshes with the tooth portion 25a provided on the timing belt 25. Therefore, by driving the motor 26 to drive the timing belt 25, the timing belt 25
Is transmitted to the slide block 15.

As shown, a rectangular housing 10
Since the driven pulleys 21 to 24 are provided at the corners of both ends of the housing, and the timing belt 25 is hung over these, the timing belt 25 is
It is arranged so as to move along the 0 side plates 10b and 10c. On the other hand, since the guide rail 13 for guiding the slide block 15 is provided in the central portion in the width direction of the housing 10 along the longitudinal direction, the timing belt 25 surrounds the guide rail 13, that is, the timing belt 25. The guide rail 13 and the guide rail 13 are arranged in the left-right direction in FIG. 3 and FIG.
Are arranged so as to overlap each other in the thickness direction. As a result, the vertical dimension of the housing 10 in the drawing can be reduced, and the device can be made thinner.

Both ends of the timing belt 25 are attached to the slide block 15 by using belt attachments 31 and 32, respectively.
Attached to. Each belt attachment 31,
Details of 32 are as shown in FIG.

Each of the belt attachments 31 and 32 is formed by bending a plate material, and includes a belt fixing portion 33 to which an end portion of the timing belt 25 is fixed and a fastening portion 34 to be fastened to the slide block 15. It has, and these are connected by the connection part 35. As shown in FIG. 4, the belt fixing portion 33 is parallel to the side plate 10c and extends in the longitudinal direction of the housing 10.

The fastening portion 34 extends substantially in parallel to the belt fixing portion 33 at a right angle, and extends in parallel with the surface of the slide block 15 in the longitudinal direction of the housing 10. The connecting portion 35 extends in the width direction of the housing 10 and is bent in a step shape. Although the belt fixing portion 33 and the fastening portion 34 are displaced from each other in the vertical direction in FIGS. 3 and 4 of the housing 10, since they are bent in a stepwise manner, they are displaced by the connecting portion 35 in the vertical direction. The belt fixing portion 33 and the fastening portion 34 are connected together.

A screw hole 3 is formed in each belt fixing portion 33.
6 is formed, and the end portion of the timing belt 25 is fixed to the belt fixing portion 33 by a screw member screwed into the screw hole 36. However, you may make it fix the edge part of the timing belt 25 using an adhesive agent.

Grooves 37 are formed on the surface of the slide block 15 so that the fastening portions 34 of the belt attachments 31, 32 are slidably engaged in the longitudinal direction.
4 is fastened to the slide block 15 in a state of entering the groove 37. Two through holes 38 are formed in the fastening portion 34, and each through hole 38 is a long hole oriented in the belt extending direction.

The slide block 15 is formed with a screw hole 40 into which the screw member 39 is screwed, and the screw hole 4 is formed.
0 corresponds to the two belt attachments 31 and 32, forming a pair of two, and a total of two pairs are formed. The two screw holes 40 forming a pair are separated by a distance corresponding to the distance between the centers of the two elongated holes formed in one belt attachment.

In order to fasten the timing belt 25 to the slide block 15, belt fittings 31,
A timing belt 25, in which 32 is fixed by a screw member or an adhesive, is prepared, and the timing belt 25 is hung over the driven pulleys 21 to 24,
Two belt mounts 31, using four screw members 39,
32 is fastened to the slide block 15. At this time, with the screw members 39 loosely attached to the screw holes 40, a predetermined tension is applied to the timing belt 25 such that both ends of the timing belt 25 are brought closer to each other.

In this state, by tightening the screw member 39, the timing belt 25 is attached to the slide block 15 with a predetermined tension. However, in the state where one of the belt attachments 31 is pulled toward the other end side of the timing belt 25, the belt attachment 3
After tightening 1 with the screw member 39, the other belt attachment 32 may be brought closer to the one belt attachment 31 to apply a predetermined tension to the timing belt 25. When such an attachment method is used, the through hole 3 of the belt attachment to be attached first is
Instead of making 8 a long hole, a circular hole that substantially corresponds to the screw hole 40 may be used.

When the screw member 39 is screwed into the screw hole 40, the screw member 39 is attached from the surface side of the slide block 15, so that the screwing operation can be easily performed. Further, when the timing belt 25 becomes loose due to the device being used for a predetermined period, at least one belt attachment 31 is adjusted and moved toward the other belt attachment 32,
It is possible to easily prevent the timing belt 25 from loosening and adjust the tension. When adjusting the tension of the belt,
Since the belt attachments 31, 32 are housed in the groove 37, the belt attachments 31, 32 can be easily moved along the groove 37.
Can be accurately adjusted and moved in a predetermined posture.

Next, a procedure for carrying a work by using the electric linear reciprocating device will be described. When the slide block 15 is located at one end in the left-right direction in FIGS. The work is mounted on. When the motor 26 is driven in this state, the timing belt 25 is driven and the slide block 15 is driven in the linear direction. As a result, the work is conveyed to a predetermined position at the other end in the left-right direction.

In the illustrated case, the drive pulley 28 is provided at the central portion in the width direction of the housing 10, but the drive pulley 28 may be provided by displacing it to one side in the width direction. This makes it possible to effectively use the space on the lower surface of the housing 10 on the side where the motor 26 is not provided.

In the illustrated case, the slide block 15
Grooves 37 are provided on both surfaces of the slide block 15 in the width direction, and any of the grooves 37 may be used to fasten the belt attachments 31, 32.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, the drive pulley 28 may be provided at either the left or right end of the both ends of the housing 10 in FIG. Also, in the case of illustration,
Although the device is installed horizontally, it may be installed vertically or in an inclined direction.

[0036]

Advantageous effects obtained by typical ones of the inventions disclosed in the present application will be briefly described.
It is as follows.

(1) The tension of the belt for converting the rotation of the motor shaft into the linear reciprocating motion of the slide block can be easily adjusted by using the belt attachment without moving the pulley.

(2) At the time of this adjustment, without disassembling the device from the surface of the slide block with a tool,
The tension can be easily adjusted.

(3) Moreover, since the belt is provided so as to surround the guide rail, the size of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of an electric linear drive device according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1 with a cover removed.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an enlarged perspective view showing the belt attachment shown in FIG.

[Explanation of symbols]

 10 Housings 11 and 12 Caps 13 Guide Rails 14 Guide Blocks 15 Slide Blocks 16 Covers 17 and 18 Gap 19 Support Tables 21 to 24 Driven Side Pulleys 25 Timing Belts 26 Motors 27 Shafts 28 Drive Side Pulleys 31 and 32 Belt Fixtures 33 Belt Fixing Part 34 Fastening part 35 Connecting part 36 Screw hole 37 Groove 38 Through hole 39 Screw member 40 Screw hole

Claims (2)

[Claims] 1. A guide rail extending in the longitudinal direction at the center in the width direction, and a housing in which pulleys are rotatably provided at both ends, respectively, and a guide rail slidable in the longitudinal direction of the housing along the guide rail. A slide block, a belt located outside the guide rail and hung on the pulley and connected to the slide block; an electric motor for driving the pulley; and an end portion of the belt having a predetermined length. A belt fixing part to be fixed and two belt attachments each having a fastening part to be fastened to the slide block, and a penetrating through which a screw member screwed into a screw hole formed in the slide block penetrates A hole is formed in each fastening portion of each of the belt attachments, and at least one fastening portion of the belt attachments is formed. Electric linear reciprocating device being characterized in that the said through-hole facing the extending direction of the belt elongated hole made. 2. The electric linear reciprocating device according to claim 1, wherein the pulleys are provided at respective four corners of the housing, and the belt is hung on the pulleys so as to surround the guide rails. An electric linear reciprocating device characterized by.