JP3025990U - Backlash removal equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] Eliminate backlash at a low cost and with a simple structure. A plurality of intermediate gears are arranged in parallel between a drive gear and a meshed body that are separated from each other, and each intermediate gear is meshed with the drive gear and the meshed body so that the drive gear is meshed. An urging device for moving and urging in the body direction is provided.

Description

[Detailed description of the device]

[0001]

TECHNICAL FIELD OF THE INVENTION

 The present invention relates to a backlash removing device for removing backlash of a meshing tooth portion of a drive gear and an engaged body which is meshed with and connected to the drive gear.

[0002]

[Prior art]

 As a conventional technique, the one disclosed in Japanese Patent Laid-Open No. 1-158265, that is, a pair of small gears having the same configuration as each other are arranged in parallel with each other on a large-diameter gear and meshed with each other. In addition, a pair of helical gears are installed between the rotary shafts of both small gears, and the meshing position of the helical teeth is adjusted, which causes backlash of meshing between the large gear and both small gears. There was one configured to be zero.

[0003]

[Problems to be solved by the device]

 Since the above-mentioned conventional one uses a helical gear, thrust in the axial direction is generated during power transmission, and it is necessary that the bearing has a structure capable of withstanding the thrust. In addition, since the pair of helical gears are moved relative to each other in the axial direction to remove the backlash, it is necessary to make the tooth thickness of one helical gear thicker than that of the other helical gear. For this reason, the above-mentioned conventional ones require a large number of special parts, are expensive, and have a drawback that the structure is complicated. It is an object of the present invention to obtain a novel backlash removing device that solves the above drawbacks.

[0004]

[Means for Solving the Problems]

 The present invention is configured as follows to achieve the above object. That is, a plurality of intermediate gears are arranged in parallel between the drive gear and the meshed body that are separated from each other, and each intermediate gear is meshed with the drive gear and the meshed body so that the drive gear is in the meshed body direction. It is configured such that an urging device for moving and urging is provided. In this case, the biasing device is preferably a cylinder. Further, the meshed body may be a rack or a gear.

[0005]

[Embodiment of device]

 An embodiment of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a front view of an engaging portion thereof, and FIG. 3 is an enlarged front view of the engaging portion thereof. In FIG. 1, reference numeral 1 denotes a channel-shaped frame having an open upper surface, which is extended in the front-rear direction. A linear guide 4 is extended and fixed to the inner surface of the left side plate 2 of the frame 1 in the front-rear direction, and a cam floor 5 vertically separated from the inner surface of the right side plate 3 in the front-rear direction. Mount at the specified pitch.

The guide beams 7 and 8 are arranged in the frame 1 by extending the traveling beam 6 made of a square pipe in the front-rear direction and extending on the left and right sides of the traveling beam 6 in the front-rear direction. It is locked to the linear guide 4 and the cam floor 5, and the traveling beam 6 can be moved in the front-rear direction via the linear guide 4 and the cam floor 5.

A motor 10 which is normally and reversely rotated is disposed above the left side plate 2 in the left-right direction to support the motor 10 so as to be vertically movable, and the motor 10 is urged downward by an urging device 11. . The urging device 11 is composed of an air cylinder, and a cylinder case 12 is attached to the upper portion of the side plate 2, and a piston 13 is fitted in the cylinder case 12 so as to be vertically movable, and a rod 13a thereof is attached to the cylinder case 12. The holding plate 14 in which the body of the motor 10 is fitted and held is connected to the lower end of the rod 13a.

The rotary shaft 10a of the motor 10 is penetrated inwardly of the left side plate 2 and a drive gear 15 composed of a spur gear having a small diameter is fixed to the rotary shaft 10a. Further, two intermediate gears 16 and 17 made of the same shape of spur gears are rotatably mounted inside the side plate 2 so as to be spaced apart in the front-rear direction, and these intermediate gears 16 and 17 are attached to the lower part of the drive gear 15. Engage side (Fig. 2). Further, a rack 20 (meshed body) extending in the front-rear direction is attached to the left surface of the traveling beam 6 facing upward, and the rack 20 is meshed with the lower portion of each of the intermediate gears 16 and 17 (FIG. 2).

Then, compressed air having a predetermined pressure is supplied to the upper chamber of the cylinder case 12 described above, and the motor 10 is urged downward through the piston 13 and the rod 13a to drive the drive gear 15 downward, that is, It is urged to move in the direction of arrow P. Then, as shown in FIG. 3, the predetermined teeth 15a, 15b on the left and right sides come into contact with the predetermined teeth 16a, 17a on the facing side of the intermediate gears 16, 17 with a predetermined pressure, and the left portion The intermediate gear 16 is urged to rotate rightward (arrow N2), and the intermediate gear 17 on the right is urged to rotate leftward (arrow M2).

When the intermediate gears 16 and 17 are rotationally biased as described above, the predetermined teeth 16b at the lower portion of the left intermediate gear 16 move the predetermined teeth 20a at the left side of the rack 20 to the left. When pressed, the predetermined teeth 17b on the lower portion of the right intermediate gear 17 press the predetermined teeth 20b on the right portion of the rack 20 to the right, whereby the drive gear 15, each intermediate gear 16, 17 and the rack 20 are pressed. Backlash does not occur at the meshing portion of each tooth, and the rack 20, and hence the traveling beam 6 is positioned at a predetermined position without fine movement.

In this state, when the drive gear 15 is rotated by the motor 10 in the direction of the right rotation arrow M1 in FIG. 3, the tooth 15b on the right side of the drive gear 15 is moved to the left side of the intermediate gear 17 on the right side. The tooth 17a of the intermediate gear 17 is rotated downward in the direction of arrow M2, the lower tooth 17b of the intermediate gear 17 pushes the right tooth 20b of the rack 20 in the direction of arrow R, and the rack 20 moves backward. It is moved to the right in the direction of arrow R, that is, to the right with zero rush. In this case, the left intermediate gear 16 is idly rotated in the direction of arrow m2 (counterclockwise rotation) by the drive gear 15 (or rack 20).

When the drive gear 15 is rotated counterclockwise in FIG. 3, that is, in the direction of the arrow N 1 by the motor 10, the left tooth 15 a of the drive gear 15 is changed to the right tooth 16 a of the left intermediate gear 16. , The intermediate gear 16 is rotated in the direction of arrow N2, the lower teeth 16b of the intermediate gear 16 press the left tooth 20a of the rack 20 in the direction of arrow L, and the rack 20 has zero backlash. In this state, it is accurately moved in the direction of arrow L, that is, to the left. In this case, the right intermediate gear 17 is idly rotated by the drive gear 15 (or rack 20) in the direction of arrow n2 (right rotation).

FIG. 4 shows a second embodiment. In this gear, the second intermediate gears 18, 19 are interposed between the respective intermediate gears 16, 17 and the rack 20, and the intermediate gears 16, 17 are racked by the second intermediate gears 18, 19 described above. It is meshed with 20. Others have substantially the same structure as the above-described first embodiment.

According to the second embodiment, when the drive gear 15 is moved and biased by the biasing device 11 in the arrow P direction (downward), the left intermediate gear 16 rotates in the arrow N2 direction (clockwise rotation). The second intermediate gear 18 on the left is rotated in the direction of arrow N3 (left rotation) by the intermediate gear 16, and at the same time, the intermediate gear 17 on the right is rotated in the direction of arrow M2 (left rotation). The intermediate gear 17 urges the second intermediate gear 19 on the right to rotate (clockwise) in the direction of arrow M3.

When the second intermediate gears 18 and 19 are rotationally biased as described above, the second intermediate gear 18 on the left portion pushes the rack 20 in the arrow R (rightward) direction and the second intermediate gear 18 on the right portion. 2 The intermediate gear 19 presses the rack 20 against the arrow L (to the left), whereby the drive gear 15, the intermediate gears 16 and 17, the second intermediate gears 18 and 19, and the meshing portions of the teeth of the rack 20. Backlash does not occur in the rack 20, and the rack 20 is positioned at a predetermined position without fine movement.

Further, in the above state, when the drive gear 15 is rotated (rotated right) in the direction of arrow M1 in FIG. 4 by the motor 10, the intermediate gear 17 at the right portion is rotated in the direction of arrow M2, and the intermediate gear 17 is rotated. As a result, the second intermediate gear 19 on the right side is rotated in the direction of arrow M3, and this second intermediate gear 19 moves the rack 20 in the direction of arrow L with zero backlash. In this case, the left intermediate gear 16 and the second intermediate gear 18 are idly rotated by the drive gear 15 (or rack 20) in the directions of arrow m2 (left rotation) and arrow m3 (right rotation).

When the drive gear 15 is rotated in the direction of arrow N1 in FIG. 4 by the motor 10, the left intermediate gear 16 is rotated in the direction of arrow N2, and the intermediate gear 16 causes the left intermediate gear 16 to rotate. The second intermediate gear 18 is rotated in the direction of arrow N3, and this second intermediate gear 18 moves the rack 20 in the direction of arrow R with zero backlash. In this case, the right intermediate gear 17 and the second intermediate gear 19 are idly rotated by the drive gear 15 (or the rack 20) in the directions of arrow n2 (right rotation) and arrow n3 (left rotation).

FIG. 5 shows a third embodiment, in which the rack 20 of the first embodiment is replaced with an internal gear (meshed body) 21 and the internal gear 21 is meshed with the drive gear 15 described above. It is engaged with the lower part of the intermediate gears 16,17. FIG. 6 shows a fourth embodiment, in which the rack 20 of the first embodiment is replaced with an external gear 22 (meshed body), and the lower parts of the intermediate gears 16 and 17 are meshed with the external gear 22. It is a thing. Similar to the first embodiment described above, the third and fourth embodiments do not cause backlash at the meshing portions of the teeth when the drive gear 15 is stopped and when the drive gear 15 is rotated normally / reversely. The stopping accuracy, forward / reverse rotation accuracy, and indexing accuracy of the gear 21 or the external gear 22 are improved. Note that, in FIGS. 5 and 6, the parts having the same reference numerals as those in FIG. 2 are the parts showing substantially the same structure and operation.

7 and 8 show a fifth embodiment. The second intermediate gears of the large diameter and the same shape are arranged in parallel with the side portions of the intermediate gears 16 and 17 meshed with the drive gear 15 and meshed with each other. The worm gears 27 and 28 of the same shape are coaxially fixed to the end portions of the rotary shafts 25a and 26a of 25 and 26, respectively, and the worm gears 27 and 28 are meshed with both sides of the worm wheel (meshed body) 29 in the radial direction. .

In the fifth embodiment as well, similar to the first embodiment described above, backlash does not occur at the meshing portion of each tooth when the drive gear 15 is stopped and when the forward / reverse rotation is performed, and the worm wheel 29 is used. Stop accuracy, forward / reverse rotation accuracy, and indexing accuracy are improved. Note that, in FIGS. 7 and 8, the parts having the same reference numerals as those in FIGS. 2 and 4 are the parts showing substantially the same structure and operation.

The above-mentioned urging device 11 is replaced with a spring, an elastic body such as rubber, an electromagnet, or an operating body (not shown) operated by a motor, and the operating body moves the motor 10 downward. Alternatively, the movement may be biased. The drive gear 15 and the intermediate gears 16 and 17 (18, 19, 25 and 26) are attached to the moving body side that moves or swivels along the frame, and the rack 20 (internal gear 21, external gear 22, worm wheel). 29) may be fixed to the frame side.

[0022]

[Effect of device]

 According to the present invention, as described above, the drive gear and the meshed body are meshed via a plurality of intermediate gears arranged in parallel, and the drive gear is urged to move toward the meshed body by the biasing device. Therefore, it is possible to configure with simple parts, and it is possible to remove backlash at a low cost and with a simple structure.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a front view of an engaging portion according to the present invention.

FIG. 3 is an enlarged front view of a meshing portion according to the present invention.

FIG. 4 is a sectional view of a meshing portion showing a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of an engagement portion showing a third embodiment of the present invention.

FIG. 6 is a sectional view of a meshing portion showing a fourth embodiment of the present invention.

FIG. 7 is a sectional view of a meshing portion showing a fifth embodiment of the present invention.

FIG. 8 is a plan view of FIG.

[Explanation of symbols]

 1 frame 2,3 side plate 4 linear guide 5 cam floor 6 traveling beam 7,8 rail 10 motor 10a rotating shaft 11 biasing device 12 cylinder case 13 piston 13a rod 14 holding plate 15 drive gear 16,17 intermediate gear 18,19th 2 intermediate gear 20 rack (meshed body) 21 internal gear (meshed body) 22 external gear (meshed body) 25, 26 second intermediate gear 25a, 26a rotary shaft 27, 28 worm gear 29 worm wheel (meshed body) (Mating body)

Claims (4)

[Scope of utility model registration request] 1. A plurality of intermediate gears are arranged in parallel between a drive gear and a meshed body that are separated from each other, and each intermediate gear is meshed with the drive gear and the meshed body to form the drive gear. A backlash removing device, characterized in that an urging device for moving and urging in a direction to be engaged is provided. 2. The backlash removing device according to claim 1, wherein the urging device is a cylinder. 3. The backlash removing device according to claim 1, wherein the mating body is a rack. 4. The backlash removing device according to claim 1, wherein the meshed body is a gear.