JP3439562B2 - Electric linear reciprocating device - Google Patents

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 in which a moving member such as a slide table for supporting a work is reciprocated 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]

Since such a linear reciprocating device is incorporated into various manufacturing devices in a factory, the thinner the housing constituting the main body of the device, the wider the range of use thereof. It will be possible. Further, when moving the work using the linear reciprocating device, the moving speed is increased, and in a device of the type that transmits the rotation of the motor to the moving member via the timing belt,
The generation of vibration of the timing belt has become a problem to be solved in this technical field as the moving speed increases.

When the timing belt vibrates, noise is generated when the moving member is driven, and the teeth of the pulley that drives the timing belt and the teeth formed on the timing belt have a certain meshing relationship. Not
There is a case where a jumping phenomenon in which the meshing is displaced occurs and it becomes impossible to accurately position the moving member at a predetermined position.

An object of the present invention is to prevent generation of noise when driving a moving member in a linear reciprocating device using an electric motor.

Another object of the present invention is to improve the positioning accuracy of the moving member.

Still another object of the present invention is to allow the device to have a thin structure.

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

[0009]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, in the electric linear reciprocating device of the present invention, the housing is provided with the drive side pulley and the driven side pulley located at a predetermined distance from the drive side pulley. A timing belt is hung around the slide rail, and a slide block is slidably mounted on a guide rail provided along the longitudinal direction of the housing, and the timing belt is fastened to the slide block by a fixing member. A vibration damping roller is provided that contacts a portion of the timing belt that is substantially parallel to each other and that faces the portion that is fastened by the fixing member.

The electric linear reciprocating device of the present invention is formed by a first slide block that slides along one side plate of the housing and a second slide block that slides along the other side plate of the housing. The timing belt is passed through a space formed between the two slide blocks. Further, the slide block is formed with a positioning groove with which the timing belt is engaged at its flat surface portion.

[0012]

In the electric linear reciprocating device having the above structure,
The timing belts hung around the two pulleys have portions that are parallel to each other, one of which has a slide block fixed thereto, and the other of which has a vibration damping roller in contact with it from the outside. As a result, when one pulley is driven by a motor to linearly move the slide block,
Generation of vibration of the timing belt is prevented, and jumping of the timing belt is prevented. Since the slid block is formed by two slide blocks and the timing belt is passed through the space formed between them, the dimension of the device corresponding to the width direction of the timing belt is shortened, A thinner device is achieved. Further, since the slide block is formed with the positioning groove with which the timing belt is engaged, the positioning of the timing belt in the width direction can be easily performed when the device is assembled.

[0013]

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

FIG. 1 is a perspective view showing the external appearance of an electric linear reciprocating device which is an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1 with a cover removed, and FIG. 2 is a plan view showing the main part of FIG. 2, and FIG. 4 is a IV-I in FIG.
5 is a sectional view taken along line V, and FIG. 5 is a sectional view taken along line VV in FIG. 3.

The electric linear reciprocating device shown in the figure has a substantially rectangular metal housing 10 which, as shown in FIGS. 4 and 5, 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. The housing 10 has its side plate 10b,
The cover 15 is attached to the housing 10 by forming predetermined gaps 13 and 14 between the slide blocks 16 and 17 and the slide blocks 16 and 17 serving as moving members projecting upward from the gaps 13 and 14 move to the housing 10 in the longitudinal direction thereof. It is installed freely.

The work is supported on the slide blocks 16 and 17 directly or via a support table 18 fixed to the slide blocks 16 and 17 as shown by the chain double-dashed line in FIG. The work is conveyed by the slide blocks 16 and 17.

Inside the housing 10, pulleys 21 and 22 having external teeth formed on both ends thereof are provided. As shown in FIG. 2, one pulley 21 is provided on a support shaft 24 of a fixing fitting 23 screwed to the housing 10, and the other pulley 22 is provided on a drive shaft 26 of a fixing fitting 25 screwed to the housing 10. The pulley 22 is a driving side pulley, and the pulley 21 is a driven side pulley.

A guide rail 27 is fixed to the bottom plate 10a of the housing 10 in the central portion in the width direction along the longitudinal direction, and is slidable in the longitudinal direction with respect to the guide rail 27 as shown in FIG. Is provided with a guide block 28. A ball (not shown) is incorporated in the guide block 28 so that the guide block 28 can reciprocate with low frictional resistance.

Two slide blocks 16 and 17 are attached to the guide block 28. An endless or endless timing belt 32 is wound around the two pulleys 21 and 22, one side of the timing belt 32 is flat, and the other side is formed on the pulleys 21 and 22. A tooth portion 32a that meshes with the formed external tooth is formed, and the tooth portion 32a faces inside and the tooth portion 32a faces each other as shown in the figure. A part of the tooth part 32a of the timing belt 32 is shown in FIG. 3, and the tooth part 32a of the other part is omitted for convenience of drawing.

The timing belt 32 is attached to one slide block 16 by a fixing member 33 so that the flat surface thereof contacts. The fixing member 33 is screwed to the slide block 16 by a screw member 34 penetrating the timing belt 32, and the fixing member 33 has a tooth portion 32 a of the timing belt 32.
It has a tooth portion 33a that meshes with. As described above, since the fixing member 33 has the tooth portion 33a that meshes with the tooth portion 32a of the timing belt 32, the timing belt 32 is firmly fastened to the slide block 16.

A belt-shaped timing belt 32 having a predetermined length
The timing belt 32 is endlessly hung over both pulleys 21 and 22 by fixing both end faces of the above to the slide block 16 with the fixing member 33 in a state of facing each other at these butting portions 35. .
2 in order to apply a predetermined tension to the timing belt 32.
The fixing members 23, 25 may be adjustable and movable in the longitudinal direction of the housing 10 so that the distance between the two pulleys 21, 22 can be adjusted. Note that the timing belt 32 formed in advance in an endless shape may be used.

As shown in FIG. 2, the timing belt 32 has portions that are parallel to each other except the portions that are hung on the pulleys 21 and 22, and among the portions that are parallel to each other, the fixing member 33. Thus, a support member 37 having a vibration damping roller 36 is attached to the slide block 17 so as to correspond to a portion facing the portion attached to the slide block 16. The damping roller 36 is used as the support member 3
It is rotatably attached to the outer peripheral surface of the timing belt 32.

As shown by the chain double-dashed line in FIG. 2, the damping roller 36 may be pushed toward the fixing member 33 to the extent that the timing belt 32 is bent into a dogleg shape.

As shown in FIGS. 3 and 4, the slide block 16 is formed with a positioning groove 38, and the timing belt 32 is engaged in the positioning groove 38 at its flat surface side portion. It has become. Accordingly, when the timing belt 32 is attached to the slide block 16, the timing belt 32 can be securely fastened at a predetermined position with the positioning groove 38 as a reference. This positioning groove 38 has two pulleys 21,2.
It is set to the same level as position 2.

As shown in FIG. 5, a drive shaft 26 is provided with a deceleration pulley 41 so as to rotate integrally with the pulley 22, and is fixed to a shaft 43 of a motor 42 attached to a bottom plate 10 a of the housing 10. An endless timing belt 45 is stretched around the driven pulley 44 and the deceleration pulley 41. Like the timing belt 32, the timing belt 45 also has tooth portions facing inward.

The diameter of the driving pulley 44 is set smaller than the diameter of the deceleration pulley 41, and the motor 42
The rotation of the shaft 43 is reduced and transmitted to the pulley 22.

Next, the procedure for carrying the work by using the electric linear reciprocating device will be described. The slide block 16 and 17 is positioned at one end in the left and right direction in FIGS. , 17 is mounted on the work. When the motor 42 is driven in this state, the timing belt 3 is passed through the timing belt 45.
2 is driven, and the slide blocks 16 and 17 are 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.

At this time, one side of the timing belt 32 that is parallel to each other is fixed to the slide block 16 by the fixing member 33, and that portion is prevented from vibrating during driving. Since the vibration damping roller 36 is in contact with the other side of the portions that are parallel to each other, the vibration is prevented. This prevents the occurrence of a jumping phenomenon in which the tooth portion 32a of the timing belt 32 and the tooth portion of the pulley 22 are misaligned, and the work is positioned at a predetermined position according to the rotation speed of the motor 42. It

The timing belt 32 has a fixing member 33 having a tooth portion 33a which meshes with a tooth portion 32a formed on the timing belt 32.
Since it is fastened to the slide block 16, the timing belt 32 is securely fixed to the slide block 16 and loosening is prevented.

Since the timing belt 32 is fixed to one of the two slide blocks 16 and 17 which are separated from each other, the space 46 between the slide blocks 16 and 17 is utilized to make a space in the space 46. Since the timing belt 32 is penetrated, the two slide blocks 16 and 17 projecting the gaps 13 and 14 formed between the cover 15 and the side plates 10b and 10c, respectively, are of one type. The size of the housing 10 in the vertical direction in the drawing can be made smaller than that in the case of using, and the electric linear reciprocating device can be made thin as a whole.

In the illustrated case, the shaft 43 of the motor 42 is displaced and attached to one side in the width direction of the housing 10 as shown in FIG. 3, and the motor 42 itself is also displaced. This makes it possible to effectively use the space on the lower surface of the housing 10 on the side where the motor 42 is not provided.

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

For example, although only one damping roller 36 is provided in the illustrated case, a plurality of damping rollers 36 may be provided. Further, a spring is provided on the support member 37,
The spring causes the vibration damping roller 36 to move to the timing belt 3
The spring force toward 2 may be biased. Further, although the apparatus is installed horizontally in the illustrated case, it may be installed vertically or in an inclined direction.

[0034]

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

(1) Since the vibration damping roller is in contact with the timing belt, the timing belt does not vibrate when the moving member reciprocates, and the noise due to the vibration is prevented.

(2) Since the timing belt does not vibrate, a jumping phenomenon between the timing belt and the pulley is prevented, and the moving member can be positioned at a predetermined position with high accuracy.

(3). The device can be made thin by forming the sluad block by two members and forming a space between them for the timing belt to pass through.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of an electric linear reciprocating device that is an embodiment of the present invention.

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

FIG. 3 is an enlarged plan view showing a main part of FIG.

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

5 is a cross-sectional view taken along the line VV in FIG.

[Explanation of symbols]

10 housing 11,12 cap 13, 14 gap 15 cover 16,17 slide block 18 tables 21 Pulley (driven pulley) 22 Pulley (drive side pulley) 23 Fixing bracket 24 Support shaft 25 fixing bracket 26 Drive shaft 27 Guide rail 28 guide blocks 32 Timing belt 33 fixing member 34 Screw member 35 Butt 36 Vibration suppression roller 37 Support member 38 Positioning groove 41 deceleration pulley 42 motor 43 shaft 44 Drive pulley 45 Timing belt 46 spaces

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-3-14953 (JP, A) JP-A-4-347967 (JP, A) JP-A-6-174038 (JP, A) JP-A 61- 140665 (JP, A) Actual flat 4-13237 (JP, U) Actual flat 6-53046 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16H 19/00-19 / 08 F16H 7/00-7/24 B23Q 5/38

Claims (3)

(57) [Claims] 1. A housing in which a drive side pulley connected to a motor and a driven side pulley located at a predetermined distance from the drive side pulley are rotatably mounted, respectively, and one side is flat and the other side is The timing belt is provided with teeth, and the teeth are opposed to each other, and the timing belt is slidable on the driving side pulley and the driven side pulley, and is slidable on a guide rail provided along the longitudinal direction of the housing. Mounted on the slide block and fastened to the timing belt by a fixing member, and facing a portion fastened by the fixing member, of the portions of the timing block, which are attached to the slide block and are substantially parallel to each other. An electric linear reciprocating device having a vibration damping roller that comes into contact with a portion. 2. The electric linear reciprocating device according to claim 1, wherein the slide block slides along one side plate of the housing and a first slide block sliding along the other side plate. And a second slide block for driving the timing belt so that the timing belt is passed through a space formed between the two slide blocks. 3. The electric linear reciprocating device according to claim 1 or 2, wherein the slide block is formed with a positioning groove with which the timing belt engages at a flat surface portion thereof. Type linear reciprocating device.