JPH0727732U - Shaking device - Google Patents

Abstract

(57) [Summary] [Purpose] It is easy to adjust the fine position of the workpiece support claw,
Also, a self-locking mechanism prevents a work support from loosening due to backlash or vibration, and further provides a swinging device that can easily move a work support claw back and forth when changing a work set. [Structure] A screw feed mechanism for moving a work support pawl in and out, a worm wheel fixed to a feed screw of the screw feed mechanism, a worm which is pressed against the worm wheel by a spring and has a rotary operation knob at a shaft end, and the worm. And a worm disengagement device having a disengagement screw that supports the worm shaft of the worm shaft and abuts against the fixed part. It can be pulled out to the outside of the wheel in the radial direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vibration damping device which is held on a work table of a machine tool and supports a long work, and more particularly to a fine movement mechanism for the vibration damping device which finely adjusts a work supporting claw.

[0002]

[Prior art]

 When grinding a long workpiece (work) with a small diameter on a cylindrical grinder or a screw grinder, an anti-vibration device that supports the middle position of the work is used in order to prevent deflection and center runout of the work being processed. Usually, the vibration suppressor is mounted on the work table of the grinder, and the work is supported by the work supporting claws at two radial positions that do not hinder the grinding work. When setting a work or changing the size of a work, the work support claw is moved in the radial direction of the work to be aligned. Conventionally, the position of the work support claw is manually adjusted by a screw feed mechanism.

FIG. 7 is a schematic sectional view of a work swinging device of this type. A swing stop device main body 2 is mounted on a work table 1 of a cylindrical grinder, and a Y-axis direction work support claw 4 is provided on the main body 2 so as to contact the outside of the work 3 from the front side of the grinder. Further, a Z-axis direction work support claw 6 for supporting the lower side part of the work 3 is attached to the tip of a lever 5 pivotally provided on the main body 2 below the Y-axis direction work support claw 4. There is. The Y-axis direction work supporting claw 4 is attached to a plunger 7 inserted in the main body 2 so as to be able to move in and out and non-rotatably, and the plunger 7 is inserted from the front side of the main body 2 so as not to move axially. It is screwed onto the screw 8. A large-diameter operation knob 9 is attached to the shaft end of the adjusting screw 8, and the position of the Y-axis direction work support pawl 4 in the front-rear direction is adjusted by the screw feeding action by the manual rotation operation of the knob 9. The Z-axis direction work support claw 6 is vertically adjusted, that is, the position is adjusted in the Z-axis direction by the movement of the plunger 10 that comes into contact with the other end of the lever 5, and this plunger 10 also has an adjusting screw 1 2 having an operation knob 11. It comes in and out by the screw feeding action of. Reference numeral 13 is a grinding wheel provided behind the work 3.

[0004]

[Problems to be solved by the device]

 This type of anti-vibration device adjusts the position by moving the work support claws by several μm during or before and after machining, depending on the dimension measurement results during or after machining the workpiece, to improve the machining accuracy of the work, especially the cylindricity. Although it is used for improving, in the above-mentioned conventional device, the adjusting screw 8 for moving the supporting claw normally has a screw pitch of about 1 mm, and since it has a structure in which it is directly rotated by the operation knob at the shaft end, it is moved by several μm. In addition, the operation of the operating knob requires a very small degree of rotation, which is about 1 ° at the most, which requires a great deal of skill. Further, there is a problem that the positions of the plunger and the work supporting pawl are changed due to the backlash and slight vibration of the adjusting screw, and the work pressing by the supporting pawl is loosened. In particular, as the work becomes longer, it is necessary to support several points in the axial direction with a span of about 200 mm, which requires a lot of labor and time to adjust the position, which is a cause of impairing productivity. .

The present invention makes it easy to adjust the fine position of the work support claw, and prevents the work support from loosening due to backlash and vibration due to the self-locking mechanism. Further, the work support claw when changing the work set is performed. The purpose is to provide an anti-sway device that can be easily moved forward and backward.

[0006]

[Means for Solving the Problems]

 According to the present invention, a screw feed mechanism for moving a work supporting pawl in and out, a worm wheel fixed to a feed screw of the screw feed mechanism, and a worm which is pressed against the worm wheel by a spring and has a rotary operation portion at a shaft end. And a worm disengagement mechanism that supports the worm shaft of the worm and has a disengagement screw that comes into contact with a fixed portion.The worm disengagement mechanism applies a pressing force to the spring by a screw operation of the disengagement screw. Provided is a vibration damping device that can be pulled out to the outside of the worm wheel in the radial direction together with the worm.

[0007]

[Operation] Instead of directly operating the screw shaft that feeds the work support pawl directly, by connecting a gear mechanism consisting of a worm wheel and a worm to the screw shaft and setting the reduction ratio to 1/50, for example, the worm It is possible to feed the work support claw 1 μm per 10 ° rotation angle of the operation knob. When moving the work support claws a lot, such as when changing the work set, the worm can be removed from the worm wheel together with its shaft support by a screw operation, allowing the rotation operation by the operation knob at the shaft end of the screw shaft as before. Becomes The worm wheel and the gear mechanism of the worm provide a self-locking function, the rotation from the worm wheel side is locked, and the worm is pressed against the worm wheel by the spring force, so that it is not affected by backlash and vibration during machining. Loosening is prevented.

[0008]

【Example】

 The present invention will now be described with reference to the embodiments shown in the drawings. FIG. 1 is a side sectional view of a vibration isolator according to an embodiment of the present invention cut along a plane perpendicular to the work axis, and FIG. 2 is a front sectional view taken along the line AA of FIG. As described in the conventional example of FIG. 7, the main body 2 of the vibration isolator is mounted on the work table 1 that reciprocates in the axial direction (X-axis direction) of the work 3 so as to straddle the table 1. The sleeves 14 and 15 which are vertically spaced apart and extend in the front and rear directions are inserted and fixed. A plunger 7 having a Y-axis direction work supporting claw 4 fixed to the tip thereof is inserted into the upper sleeve 14 in a non-rotatable and axially movable manner, and the plunger 7 has an axial movement protruding toward the other end (front side of the apparatus). An ineffective adjusting screw 8 is screwed, and a rotary operation knob 9 is fixed to the shaft end of the adjusting screw 8. The rotation of the adjusting screw 8 causes the plunger 7, and hence the workpiece support pawl 4 at the tip thereof, to move in and out in the Y-axis direction (front-back direction), and the front side contact position of the workpiece 3 is adjusted. A middle part of the lever 5 is pivotally attached to the main body 2 at a substantially intermediate position between the upper and lower sleeves 14 and 15, and the tip of the lever 5 contacts the lower part of the work 3 to support the work in the Z-axis direction. The work supporting claw 6 is fixed. The other end of the lever 5 is in contact with the tip of the plunger 10 which is inserted into the lower sleeve 15 so as to be non-rotatable and axially movable. Similarly, the lower plunger 10 is also screwed with an adjusting screw 12 protruding to the front end of the sleeve 15, and a rotary operation knob 11 is fixed to the front end of the screw 12, and the adjusting screw 12 and the plunger 10 are screwed by the screw feeding action. The plunger 10 moves in and out, and the vertical position (Z-axis direction) of the workpiece support pawl 6 in the Z-axis direction is adjusted via the lever 5.

2 and 3 to 6, the worm wheels 16 and 17 are fixed to the shaft portions 8a and 12a of the adjusting screws 8 and 12, and the worms 18 and 19 that mesh with the worm wheels 16 and 17, respectively. Operation knobs 20 and 21 are attached to the worm shaft end of. The holding structure of each worm 18, 19 will be described below. A fixing plate 22 is fixed to the front surface of the main body 2 at a position close to the sides of the sleeves 14 and 15 so as to project to the side of the sleeves 14 and 15. As shown in the exploded view of FIG. 6, a worm shaft insertion block 25 having elongated holes 23 and 24 is fixed to the portion. Further, a protrusion 26 is formed at the end of the fixed plate 22 at a substantially intermediate position between these blocks 25. Further, a U-shaped member 27 having a shape straddling the upper and lower worm shaft insertion blocks 25 is placed on the outer side of the fixed plate 22. The U-shaped member 27 has holes 28 and 29 formed on both arms 27a and 27b thereof, which are aligned with the long holes 23 and 24 of the block 25 and axially support the shafts of the worms 18 and 19, respectively. At the center of the U-shaped member 27, a worm releasing screw member 30 having a tip abutting against the protrusion 26 of the fixing plate 22 is screwed.

Referring to FIGS. 3 to 5, each worm shaft insertion block 25 acts on a side portion of the worm shaft 18 a, 19 a inserted into the long hole 23, 24 to cause the worm 18, 19 to worm. A spring mechanism portion for pressing the wheels 16 and 17 is provided. The spring mechanism portion includes a hollow spring case 31 that is screwed into the worm shaft insertion block 25, an indenter 32 that projects from the inside of the spring case 31 toward the worm shafts 18a and 19a, an inner end of the indenter 32 and a case end plate 31a. And a compression spring 33 housed between. The worm shafts 18a and 19a are rotatably supported by the worm shaft support holes 28 and 29 of the U-shaped member 27 through the elongated holes 23 and 24 in a state where the U-shaped member 27 is covered with the fixing plate 22. By loosening the worm detachment screw member 30, the worm shafts 18a and 19a together with the U-shaped member 27 are urged toward the worm wheels 16 and 17 by the pressing force of the compression spring 33 of the spring mechanism portion, and thereby the worm wheel is constantly wormed. Proper pressing of the 18, 19 and the worm wheels 16, 17 is provided. The worm 18 and the worm shaft 18a are formed as separate bodies, and both are fixed by a key, a set screw or the like at the time of assembling the anti-vibration device. First, at the time of assembling, the worm shaft 18a is removed from the worm 18, and the worm 18 is positioned between the long holes 23, 24 of the worm shaft insertion block 25, 25 of the fixed plate 22. In this state, the worm shaft insertion block 25 , 25 is covered with a U-shaped member 27, and the worm shaft 18a having the operation knob 20 is inserted from the upper shaft support hole 23 of the U-shaped member 27 into the worm 18 and the lower shaft support hole 24. Finally, the worm 18 and the worm shaft 18a are fixed with a set screw (not shown). The same applies to the other worm 19 and the worm shaft 19a.

The speed reduction ratio between the worm wheels 16 and 17 and the worms 18 and 19 is 1/50 in this embodiment. Therefore, by rotating the operation knobs 20 and 21 at the shaft ends of the worms 18 and 19 by, for example, 10 °, the pitch of the adjusting screws 8 and 12 is set to 1 mm, and the plungers 7 and 10 are fed by 1 μm, that is, in the Y-axis direction and Z direction. Axial workpiece Support pawls 4 and 6 can be moved back and forth and up and down, respectively. Also, the rotation of the worm wheel side is locked by the mechanism of the worm wheels 16 and 17 and the worms 18 and 19, so that the vibration of the workpiece support claws during processing and the loosening of the work pressing due to the backlash of the adjusting screw are prevented. To be done. When an appropriate pressing force of the worms 18, 19 to the worm wheels 16, 17 is obtained, the worm detaching screw member 30 is brought into contact with the protrusion 26 of the fixing plate 22 to fix the U-shaped member 27.

When setting works of different sizes, it is necessary to move the work supporting claws of the swinging device rapidly and largely. In this case, the worm detaching screw member 30 screwed into the U-shaped member 27 is rotated and pressed against the protrusion 26 of the fixing plate 22, and the U-shaped member 27 is worm shafts 18a, 19a by the screw action. At the same time, the space between the elongated holes 23 and 24 of the worm shaft insertion block 25 is moved backward to disengage the worms 18 and 19 from the worm wheels 16 and 17, and the adjusting knobs at the shaft ends of the adjusting screws 8 and 12 are operated. By turning 9 and 11, the plungers 7 and 10 and the work supporting claws 4 and 6 are moved. The Z-axis direction work supporting claw 6 is separated downward of the work by the lever 5 rotating by its own weight when the plunger 10 moves backward.

[0013]

[Effect of device]

 As described above, according to the present invention, the adjusting screw of the work supporting pawl is not directly operated, but the adjusting screw is rotated through the mechanism of the worm wheel and the worm having a large reduction ratio. The operation amount (rotation amount) of the operation knob can be made large, which makes it extremely easy to fine-tune the work support pawl in μm units. In addition, the structure in which the worm is constantly pressed against the worm wheel prevents the work holding force of the work supporting claws from loosening due to vibration and backlash during machining of the work, and the worm can be easily replaced when changing the work set. Since it can be detached from the worm wheel, the work support claw can be greatly moved forward and backward in a short time. There is no need to rely on the skill of the worker as in the past, and there is an effect that production efficiency can be greatly improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of a swing-off device according to an embodiment of the present invention.

FIG. 2 is a front sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged cross-sectional view of portion B of FIG.

FIG. 4 is a top view of FIG.

5 is a front view as seen from the direction of arrow F in FIG.

FIG. 6 is an exploded perspective view of a worm shaft holding mechanism portion according to an embodiment of the present invention.

FIG. 7 is a schematic side sectional view of a conventional anti-vibration device.

[Explanation of symbols]

 1 Work Table 2 Main Body 3 Work 4 Y-axis Direction Work Support Claw 5 Lever 6 Z-axis Direction Work Support Claw 8,12 Adjustment Screw 9,11 Operation Knob 16,17 Worm Wheel 18,19 Worm 18a, 19a Worm Shaft 20, 21 Operation Knob 22 Fixed Plate 23, 24 Long Hole 25 Worm Shaft Insertion Block 26 Protrusion 27 U-Shaped Member 28, 29 Shaft Support Hole 30 Worm Removal Screw Member 32 Indenter 33 Compression Spring

Claims (1)

[Scope of utility model registration request] 1. A screw feed mechanism for moving a work support pawl in and out, a worm wheel fixed to a feed screw of the screw feed mechanism, and a worm which is pressed against the worm wheel by a spring and has a rotation operation portion at a shaft end. A worm disengagement mechanism having a disengagement screw that pivotally supports the worm shaft of the worm and abuts against a fixed portion, and the worm disengagement mechanism resists a pressing force of the spring by a screw operation of the disengagement screw. And a swaying device that can be pulled out to the outside of the worm wheel in the radial direction together with the worm.