JP2000024806A - Spindle support mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the rocking of a spindle in the radial direction and repeatedly position a center and a chuck in the radial direction with high precision by providing a split wedge section for supporting the spindle on a sleeve arranged between a cylinder and the spindle. SOLUTION: A center 2 is advanced by the exciting force of a spring 52 via a spindle 4, and a work W is held between the center on the spindle stock side and a chuck. A sleeve 3 is also advanced, a front split wedge section 31 is inserted between the tapered face 41 of the spindle 4 and a cylinder 1, and the spindle 4 is firmly supported along the cylinder 1. The front section of the spindle 4 can be supported on the cylinder 1 via the split wedge section 31 of the sleeve 3, the rocking of the front section of the spindle 4 in the radial direction is prevented, and the center 2 can be positioned in the radial direction with high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle support mechanism provided on a tailstock or the like opposed to a headstock side, and more particularly, to a spindle machine installed on a processing machine such as a grinder, a lathe, a gear cutting machine or a measuring instrument. The present invention relates to a spindle support mechanism capable of holding a center, a chuck, and the like, which repeatedly require high-precision radial positioning.

[0002]

2. Description of the Related Art In a processing machine such as a grinder, a lathe, and a gear cutting machine, and a measuring instrument, a conventional spindle supporting mechanism includes a center, a chuck, and a chuck for repeatedly positioning a center and a chuck in a radial direction. By directly inserting the spindle holding the spindle into the cylinder, the spindle is directly supported by the cylinder.

[0003]

As shown in FIG. 9, a conventional spindle support mechanism A 'of a tailstock C has the following features.
The spindle 4 is directly supported by inserting the spindle 4 into the cylinder 1 fixed to the tailstock C. The center 2 is fixed to the tip of the spindle 4, and the operating lever H is operated via the operating rod 6. The spindle 4 is configured to move forward and backward. As described above, when the spindle 4 is inserted into the cylinder 1 so as to be able to advance and retreat,
Since it is necessary to provide a required gap between the cylinder 1 and the spindle 4 so that the spindle 4 can advance and retreat (make a gap), even if the center 2 is fixed to the spindle 4, the spindle 4 is It swings in the radial direction within the range of the gap formed between the spindle 1 and the spindle 4, making it difficult to improve the positioning accuracy in the radial direction beyond a certain level. There has been a problem that it is difficult to obtain the positioning accuracy in the radial direction required with the improvement in performance.

The present invention has been made in view of the above-mentioned problems of the conventional spindle support mechanism, and is installed in a processing machine such as a grinding machine, a lathe, and a gear cutting machine, a measuring instrument, and the like, so that the spindle can be swung in a radial direction. An object of the present invention is to provide a spindle support mechanism for holding a center, a chuck, and the like, which can prevent the center and the chuck from being repeatedly positioned with high accuracy.

[0005]

In order to achieve the above object, a spindle support mechanism according to the present invention is arranged so that a cylinder and a cylinder are inserted into the cylinder so as to be able to advance and retreat, and are disposed between the cylinder and the spindle to support the spindle. And a spindle provided with a split wedge-shaped portion, and a spindle fitted into the sleeve.

In the spindle support mechanism of the present invention having the above-described structure, a split type wedge-shaped portion for supporting the spindle is provided on the sleeve disposed between the cylinder and the spindle. Even if there is a gap for allowing the advancing and retreating, by inserting the split-type wedge-shaped part provided in the sleeve, the gap between the cylinder and the spindle is eliminated via the sleeve, and each member comes into close contact with each other, The pivoting of the spindle in the radial direction can be prevented, and the positioning of the center, the chuck, and the like in the radial direction can be repeated with high accuracy.

In this case, a tapered surface can be formed on the outer peripheral surface of the front portion of the spindle, which supports the spindle inserted into the sleeve via a split wedge-shaped portion provided on the sleeve.

Thus, the spindle can be reliably supported via the split wedge-shaped portion of the sleeve by the action of the tapered surface formed on the outer peripheral surface of the front portion of the spindle.

Further, a tapered surface for supporting a spindle inserted into the sleeve via a split wedge-shaped portion provided on the sleeve can be formed on the inner peripheral surface of the front portion of the cylinder.

Thus, the spindle can be reliably supported via the split wedge-shaped portion of the sleeve by the action of the tapered surface formed on the inner peripheral surface of the front portion of the cylinder.

A collar can be provided at the rear of the spindle.

Thus, the rear portion of the spindle can be supported by the cylinder via the collar provided on the spindle, thereby preventing the rear portion of the spindle from swinging in the radial direction and positioning the center, the chuck, and the like in the radial direction. Can be performed with higher accuracy.

Further, a tapered surface may be formed on an outer peripheral surface of a rear portion of the spindle, and the spindle may be supported via a split wedge-shaped portion provided on a tapered collar disposed between the cylinder and the spindle.

Thus, by inserting the split wedge-shaped portion provided on the tapered collar, a gap between the cylinder and the spindle is eliminated via the tapered collar, and the members come into close contact with each other, so that the radial portion of the rear portion of the spindle is formed. By preventing the swing in the direction, the center, the chuck and the like can be positioned more precisely in the radial direction.

Further, a spring for pressing and sliding the sleeve independently of the spindle can be provided.

Thus, the sleeve and the spindle can be slid independently of each other to prevent the oil film from running out, and the spindle can be moved and supported reliably.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the spindle support mechanism of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the spindle support mechanism of the present invention. This spindle support mechanism A
For example, it is used by being attached to a tailstock C slidably and fixedly mounted on a table B of a grinding machine as shown in FIG. A sleeve 3 provided with a split wedge-shaped portion 31 to be inserted and disposed between the cylinder 1 and the spindle 4 to support the spindle 4
A spindle 4 fitted in the sleeve 3, a center 2 fixed to the tip of the spindle 4, and a rear end side of the cylinder 1; Adjusting pressing force adjusting means 5
It is composed of

The cylinder 1 has a required diameter and length. Male threads are engraved on the outer peripheral surfaces at the front and rear ends. Caps 11 and 12 are attached to the male threads while the cylinder 1 is inserted into the tailstock C. Is screwed to fix the cylinder 1 to the tailstock C. A center insertion hole 11H for inserting the center 2 is formed in the center of the cap 11 on the distal end side. A screw hole 12H is formed in the center of the cap 12 on the rear end side, and the adjusting tool 50 of the pressing force adjusting means 5 for adjusting the pressing force of the center 2 against the held object W is formed in the screw hole 12H. The male screw formed in the above is screwed.

The spindle 4 has a cylindrical shape, the center 2 is fixed to the tip, and the outer peripheral surface of the front part is a divergent tapered surface 41, and the split wedge-shaped part formed on the front part of the sleeve 3 is formed on the tapered surface 41. The part 31 abuts, and the gap between the cylinder 1 and the spindle 4 is eliminated via the sleeve 3, and each member 1,
When the members 3 and 4 are in close contact with each other, the pivoting of the spindle 4 in the radial direction is prevented, so that the spindle 4 can be supported with high precision. This spindle 4
A long hole 4H long in the axial direction,
And one end of the operating rod 6 that penetrates the sleeve 3 is movably inserted along the elongated hole 4H. The other end of the operating rod 6 protrudes through an elongated hole 1H drilled in the axial direction of the cylinder 1 and an elongated hole (not shown) drilled in the tailstock C. To be able to perform moving operations.

The sleeve 3 has a cylindrical shape, and a split wedge-shaped portion 31 having a front portion divided into a plurality in the circumferential direction is integrally formed, and the inner peripheral surface of the split wedge-shaped portion 31 has an inner diameter at the tip end. At the same time, the tapered surface of the split-type wedge-shaped portion 31 is brought into contact with the tapered surface 41 of the spindle 4 to support the spindle 4 and, at the same time, the outer peripheral surface of the split-type wedge-shaped portion 31 of the sleeve 3 is moved in the radial direction. So that it comes into contact with the inner peripheral surface of the cylinder 1. Further, an operation rod 6 that penetrates the sleeve 3 is protruded from the sleeve 3.

The pressing force adjusting means 5 includes an adjusting tool 50 having a knob for performing a rotating operation and a male screw, a spring receiver 51 attached to the rear end of the sleeve 3, the adjusting tool 50 and the spring receiver 5.
1 and a spring 53 disposed between the spring receiver 51 and the rear end of the spindle 4.
Then, by rotating the adjusting tool 50 screwed to the cap 12 on the rear end side of the cylinder 1, the urging force of the spring 52 is adjusted to adjust the pressing force of the center 2 against the object W to be held. I do.

Next, the operation of this embodiment will be described.
As shown in FIG. 1, the center 2 is fixed to the tip of the spindle 4, and the adjustment tool 50 is rotated to adjust the pressing force of the center 2 on the object W to be held. In this state, as shown in FIG. 2A, the operation rod 6 of the spindle support mechanism A attached to the tailstock C is moved along the elongated holes 1H and 4H against the urging force of the spring 52. When retracted, the sleeve 3 on which the operating rod 6 is protruded is retracted, whereby the split wedge 31 at the front of the sleeve 3 is separated from the tapered surface 41 of the spindle 4 and the cylinder 1 and the split wedge are separated. The support of the spindle 4 by the spindle 31 is released, and the members 1, 3, and 4 are loosely fitted. When the operating rod 6 reaches the rear end of the long hole 4H of the spindle 4, the spindle 4 moves back together with the sleeve 3 against the spring 52, and the center 2 fixed to the front end of the spindle 4 also moves backward.

In this state, after the object to be held W is inserted between the opposed centers 2 and 2 and the operating force of the operating rod 6 is released as shown in FIG. The center 2 moves forward via the spindle 4 at a position between the center 2 and the chuck or the like on the headstock side.
Hold. At this time, the sleeve 3 also advances, and the split wedge-shaped portion 31 at the front is inserted between the tapered surface 41 of the spindle 4 and the cylinder 1 so that the spindle 4 is securely supported along the cylinder 1. As a result, the front portion of the spindle 4 can be supported by the cylinder 1 via the split wedge-shaped portion 31 of the sleeve 3, and the front portion of the spindle 4 is prevented from swinging in the radial direction. Direction positioning can be performed with high accuracy.
After performing the required processing, as shown in FIG. 2A, the operation rod 6 of the spindle support mechanism A is
By retracting along the elongated holes 1H and 4H against the urging force of the above, the holding of the held object W by the center 2 can be released.

FIG. 3 shows a second embodiment of the spindle support mechanism of the present invention. In the present embodiment, the radial swing of the spindle 4 with respect to the cylinder 1 is reduced at the front and rear portions of the spindle 4, so that the spindle 4 can be firmly and precisely supported along the cylinder 1. As described above, the collar 44 is formed integrally with the rear portion of the spindle 4 by screwing. In this case, a spring 53 is provided between the collar 44 and the sleeve 3.

As a result, as shown in FIG. 3B, the rear part of the spindle 4 is
The center 2 can be supported in the radial direction by preventing the rear portion of the spindle 4 from swinging in the radial direction, and the center 2 can be positioned more precisely. Other configurations and operations of this embodiment are the same as those of the first embodiment.

FIG. 4 shows a modification of the second embodiment of the spindle support mechanism of the present invention. In this modification, the radial swing of the spindle 4 with respect to the cylinder 1 in the front and rear portions of the spindle 4 is reduced, so that the spindle 4 can be firmly supported along the cylinder 1 with higher precision. As described above, the collar 45 is formed integrally with the rear portion of the spindle 4. Other configurations and operations of this modification are the same as those of the second embodiment.

FIG. 5 shows a third embodiment of the spindle support mechanism of the present invention. In this embodiment, the spindle 4 can be supported with higher precision than in the second embodiment. A tapered surface 42 is formed on the outer peripheral surface of the rear portion of the spindle 4 so that the cylinder 1 and the spindle 4 can be supported. The spindle 4 is supported via a split wedge-shaped portion 46a provided on a tapered collar 46 disposed therebetween. In this case, a spring 54 is provided between the tapered collar 46 and the sleeve 3.

As a result, as shown in FIG. 5A, the operating rod 6 of the spindle support mechanism A is retracted along the elongated holes 1H and 4H against the urging force of the springs 54 and 52. Then, the sleeve 3 on which the operating rod 6 is protruded and the tapered collar 46 retract, whereby the split wedge-shaped portion 31 at the front of the sleeve 3 is moved from the tapered surface 41 at the front of the spindle 4 and the tapered collar 41. 46 split wedge-shaped portions 46a
Is separated from the tapered surface 42 at the rear of the spindle 4, the support of the spindle 4 by the split wedge-shaped portion 31 of the cylinder 1 and the sleeve 3 and the split wedge-shaped portion 46a of the tapered collar 46 is released. A loose fitting state is formed between the portions 4 and 46. When the operating force of the operating rod 6 is released as shown in FIG. 5B, the tapered collar 46 advances, and the split wedge-shaped portion 46a is inserted between the tapered surface 42 at the rear of the spindle 4 and the cylinder 1. Then, the rear part of the spindle 4 can be supported on the cylinder 1 through the split wedge-shaped portion 46a of the tapered collar 46 so that the spindle 4 is securely supported along the cylinder 1. In the radial direction can be prevented, and the center 2 can be positioned more precisely in the radial direction. Other configurations and operations of this embodiment are the same as those of the first embodiment.

FIG. 6 shows a fourth embodiment of the spindle support mechanism of the present invention. In the present embodiment, a tapered surface 15 that supports the spindle 4 inserted into the sleeve 3 through a split wedge-shaped portion 31 provided on the sleeve 3 is formed on the inner peripheral surface of the front portion of the cylinder 1. , Supporting the front part of the spindle 4. In this case, the inner peripheral surface of the front part of the cylinder 1 is formed on the tapered surface 15 so that the inner diameter on the distal end side becomes small, and the front inner part of the sleeve 3 inserted into the cylinder 1 is divided. Mold wedge-shaped part 31
The inclined surface is formed on the outer peripheral surface side so as to abut on the tapered surface 15. In addition, the spindle 4 is formed in a straight shape, and a collar 45 is formed integrally with the inner peripheral surface of the cylinder 1 at a rear portion, and the operation rod 6 is protruded from the spindle 4. Also, a spring 53 is provided between the collar 45 and the sleeve 3. Further, a long hole 3H is formed in the sleeve 3 so that the operation rod 6 and the spindle 4 are interlocked.

As a result, as shown in FIG. 6A, when the operating rod 6 of the spindle support mechanism A is retracted along the elongated holes 1H and 3H against the urging force of the spring 52, When the spindle 4 on which the operating rod 6 is protruded retreats, and when the operating rod 6 reaches the rear end of the long hole 3H of the sleeve 3, the sleeve 3 retreats together with the spindle 4, whereby the split wedge-shaped front part of the sleeve 3 is formed. The part 31 is separated from the tapered surface 15 of the cylinder 1, the support of the spindle 4 by the split wedge-shaped part 31 of the cylinder 1 and the sleeve 3 is released, and the members 1, 3, 4 are loosely fitted. 6B, when the operating force of the operating rod 6 is released, the sleeve 3 and the spindle 4 advance, and the split wedge-shaped portion 31 is inserted between the tapered surface 15 of the cylinder 1 and the spindle 4. Then, the front part of the spindle 4 is supported on the cylinder 1 via the split wedge-shaped part 31 of the sleeve 3 so that the spindle 4 is securely supported along the cylinder 1, and the rear part of the spindle 4 is Collar 4 formed on spindle 4
5, can be supported on the cylinder 1 to prevent the front and rear portions of the spindle 4 from swinging in the radial direction,
The center 2 can be positioned more precisely in the radial direction. Other configurations and operations of this embodiment are the same as those of the first embodiment.

FIG. 7 shows a fifth embodiment of the spindle support mechanism of the present invention. In the present embodiment, a tapered surface 15 that supports the spindle 4 inserted into the sleeve 3 through a split wedge-shaped portion 31 provided on the sleeve 3 is formed on the inner peripheral surface of the front portion of the cylinder 1. , Supporting the front part of the spindle 4. In this case, the inner peripheral surface of the front part of the cylinder 1 is formed on the tapered surface 15 so that the inner diameter on the distal end side becomes small, and the front inner part of the sleeve 3 inserted into the cylinder 1 is divided. Mold wedge-shaped part 31
The inclined surface is formed on the outer peripheral surface side so as to abut on the tapered surface 15. In addition, the spindle 4 is formed in a straight shape, and the operation rod 6 projects from the sleeve 3. Further, a spring 53 is provided between the rear end of the sleeve 3 and the cap 12.

As a result, as shown in FIG. 7A, the operating rod 6 of the spindle support mechanism A is
Is retracted along the elongated holes 1H and 4H against the urging force of the sleeve 3, the sleeve 3 and the spindle 4 on which the operating rod 6 is protruded are retracted, whereby the split wedge-shaped front portion of the sleeve 3 is formed. The part 31 is separated from the tapered surface 15 of the cylinder 1, the support of the spindle 4 by the split wedge-shaped part 31 of the cylinder 1 and the sleeve 3 is released, and the members 1, 3, 4 are loosely fitted. 7B, when the operating force of the operating rod 6 is released, the sleeve 3 and the spindle 4 advance, and the split wedge-shaped portion 31 is inserted between the tapered surface 15 of the cylinder 1 and the spindle 4. Being spindle 4
Is firmly supported along the cylinder 1 so that the front part of the spindle 4 can be supported on the cylinder 1 via the split wedge-shaped part 31 of the sleeve 3, and the front part of the spindle 4 in the radial direction can be supported. By preventing the swing, the center 2 can be positioned in the radial direction with high accuracy. Other configurations and operations of this embodiment are the same as those of the first embodiment.

Although the spindle support mechanism of the present invention has been described based on the embodiment in which the spindle support mechanism is applied to a tailstock of a grinding machine, the spindle support mechanism of the present invention is not limited to a grinder and a lathe. , Gear cutting machines and other processing machines,
It can be widely used for a spindle support mechanism that is installed in a measuring instrument or the like and holds a center, a chuck, and the like, which repeatedly requires high-precision positioning in the radial direction.

[0035]

According to the spindle support mechanism of the first aspect, a split wedge-shaped portion for supporting the spindle is provided on the sleeve disposed between the cylinder and the spindle. Even if a gap for allowing the sleeve to move forward and backward is provided, by inserting the split wedge-shaped part provided on the sleeve, the gap between the cylinder and the spindle is eliminated via the sleeve, and each member comes in close contact with each other. Prevents radial oscillation of the spindle and enables high-precision repetition of radial positioning of the center, chuck, etc., which enables processing machines such as grinders, lathes, and gear cutting machines, and measurement It is possible to improve the processing accuracy or measurement accuracy of a device or the like.

According to the spindle support mechanism of the second aspect, the tapered surface for supporting the spindle fitted into the sleeve through the split wedge-shaped portion provided on the sleeve on the outer peripheral surface of the front portion of the spindle. Is formed, the spindle can be reliably supported via the split wedge-shaped portion of the sleeve by the action of the tapered surface formed on the outer peripheral surface of the front portion of the spindle.

According to the spindle support mechanism of the third aspect, the taper which supports the spindle fitted in the sleeve on the inner peripheral surface of the front portion of the cylinder via the split wedge-shaped portion provided on the sleeve. By forming the surface, the spindle can be reliably supported via the split wedge-shaped portion of the sleeve by the action of the tapered surface formed on the inner peripheral surface of the front portion of the cylinder.

According to the spindle support mechanism of the fourth aspect, by providing the collar at the rear of the spindle, the rear of the spindle can be supported by the cylinder via the collar provided on the spindle. By preventing the rear portion from swinging in the radial direction, the center, the chuck, and the like can be positioned in the radial direction with higher accuracy.

According to the spindle support mechanism of the fifth aspect, the tapered surface is formed on the outer peripheral surface of the rear portion of the spindle, and the split wedge-shaped portion provided on the tapered collar disposed between the cylinder and the spindle is provided. By supporting the spindle, by inserting the split wedge-shaped part provided in the tapered collar, the gap between the cylinder and the spindle is eliminated through the tapered collar, and the members are in close contact with each other. By preventing the rear portion from swinging in the radial direction, the positioning of the center, the chuck, and the like in the radial direction can be performed with higher accuracy.

According to the spindle support mechanism of the sixth aspect, the oil film is formed by arranging the spring for pressing and sliding the sleeve independently of the spindle so that the sleeve and the spindle slide independently of each other. Cutting can be prevented, and movement and support of the spindle can be reliably performed.

[Brief description of the drawings]

FIGS. 1A and 1B show a first embodiment of a spindle support mechanism of the present invention, wherein FIG. 1A is a front vertical sectional view, and FIG. 1B is a sectional view taken along line XX of FIG.

FIGS. 2A and 2B are front longitudinal sectional views showing a state before holding an object to be held, and FIGS. 2B and 2B are front longitudinal sectional views showing a state where the object to be held is sandwiched.

3A and 3B show a second embodiment of the present invention, in which FIG. 3A is a front vertical sectional view showing a state before holding an object to be held, and FIG. 3B is a front vertical sectional view showing the same holding state.

4A and 4B show a modified example of the second embodiment of the present invention, wherein FIG. 4A is a front vertical sectional view showing a state before holding an object to be held, and FIG. 4B is a front vertical sectional view showing the same holding state. .

5A and 5B show a third embodiment of the present invention, wherein FIG. 5A is a front vertical cross-sectional view showing a state before holding an object to be held, and FIG. 5B is a front vertical cross-sectional view showing the same holding state.

6A and 6B show a fourth embodiment of the present invention, wherein FIG. 6A is a front vertical sectional view showing a state before holding an object to be held, and FIG. 6B is a front vertical sectional view showing the same holding state.

7A and 7B show a fifth embodiment of the present invention, wherein FIG. 7A is a front vertical cross-sectional view showing a state before holding an object to be held, and FIG. 7B is a front vertical cross-sectional view showing the same holding state.

FIG. 8 is a schematic front view of a grinding machine.

FIG. 9 is a front vertical sectional view of a conventional tailstock spindle support mechanism.

[Explanation of symbols]

 Reference Signs List A spindle support mechanism C tailstock 1 cylinder 2 center 3 sleeve 31 split wedge-shaped portion 4 spindle 41 tapered surface 44,45 collar 5 pressing force adjusting means 52,53,54 spring 6 operating rod

Claims (6)

[Claims] 1. A sleeve having a cylinder, a sleeve inserted and retractably inserted into the cylinder, a split wedge-shaped portion provided between the cylinder and the spindle to support the spindle, and a spindle inserted into the sleeve. And a spindle support mechanism comprising: 2. A tapered surface for supporting a spindle inserted into a sleeve through a split wedge-shaped portion provided on the sleeve is formed on an outer peripheral surface of a front portion of the spindle. Spindle support mechanism. 3. A tapered surface formed on an inner peripheral surface of a front portion of the cylinder for supporting a spindle inserted into the sleeve via a split wedge-shaped portion provided on the sleeve. The spindle support mechanism as described in the above. 4. The spindle support mechanism according to claim 1, wherein a collar is provided at a rear portion of the spindle. 5. A spindle according to claim 1, wherein a tapered surface is formed on an outer peripheral surface of a rear portion of the spindle, and the spindle is supported via a split wedge-shaped portion provided on a tapered collar disposed between the cylinder and the spindle. The spindle support mechanism according to claim 1, 2 or 3. 6. The spindle support mechanism according to claim 1, further comprising a spring for pressing and sliding the sleeve independently of the spindle.