JP2000055012A - Rotary cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust a stroke of a piston without removing a cylinder body from a main shaft or decomposing it. SOLUTION: A piston 10 is contained in a cylinder body 1 which rotates integrally with a main shaft, and the piston 10 is provided with a piston shaft 13 penetrating a distribution shaft 5. A small diameter nut 24 to regulate a forward stroke end of the piston 10 is engaged around a back prtoruded part of the piston shaft 13 to be incapable of relative rotation and capable of relative move in a cylinder axial line direction. A large diameter nut 25 is engaged with the small diameter nut 24, and a forward end part of the large diameter nut 25 is assembled on the piston shaft 13 by a holding ring 34 to be incapable of relative move in the cylinder axial line direction. A tool is hooked on a hooking hole 25b of the large diameter nut 25, the large diameter nut 25 is rotated by operation from the back side of a cylinder, and the small diameter nut 24 is position-adjusted on the piston shaft 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cylinder for opening and closing a lathe chuck and the like.

[0002]

2. Description of the Related Art When changing the opening and closing strokes of a power chuck, a collet chuck and the like of a lathe, it is necessary to adjust the piston stroke of the rotary cylinder accordingly. For example, in the conventional rotary cylinder shown in FIG.
2 is attached with a screw 53 to adjust the stroke of the piston 54. Further, in the conventional rotary cylinder shown in FIG. 6, a distribution shaft 56 is provided on the rear side of the cylinder body 51, the piston shaft 57 is penetrated by the distribution shaft 56, and an adjusting ring 58 By changing the axial position of the ring 58, the piston 5
4 stroke is adjusted.

[0003]

However, according to the rotary cylinder shown in FIG. 5, every time the stroke is changed, it is necessary to remove the cylinder body 51 from the main shaft, disassemble the main body, and replace the stopper 52, which requires a large amount of work. There is a problem that it takes time and effort. Further, in the case of the rotary cylinder shown in FIG. 6, since the screw 59 of the adjusting ring 58 is operated from the side of the cylinder, there is a problem that the cover of the lathe is obstructed and the work becomes difficult.

An object of the present invention is to provide a rotary cylinder that can easily adjust the stroke of a piston without removing or disassembling the cylinder body.

[0005]

In order to solve the above-mentioned problems, a rotary cylinder according to the present invention accommodates a piston inside a cylinder body which rotates integrally with a main shaft, and penetrates the piston through the cylinder body and moves the piston rearward. A regulating member that regulates one stroke end of the piston on the outer periphery of the protruding portion of the piston shaft, and an adjusting member that adjusts the position of the regulating member in the cylinder axis direction on the piston shaft by operating from behind. (Claim 1).

Here, in order to accurately adjust the piston stroke, it is preferable to use screws for the regulating member and the adjusting member. In the rotating cylinder of the present invention, a small-diameter nut having a thread portion on the outer periphery is used as the regulating member, a large-diameter nut having a thread portion on the inner periphery is used as the adjusting member, and the small-diameter nut cannot rotate relative to the piston shaft and The screw portion of the large-diameter nut is screwed into the screw portion of the small-diameter nut, and the operating portion is provided at the rear end of the large-diameter nut.

In this case, a large-diameter nut is attached to the piston shaft so as to be relatively rotatable and relatively immovable in the cylinder axis direction so that the stroke can be adjusted with reference to the rear end position of the piston. It is preferable to provide a contact member with which the front end face of the small-diameter nut comes into contact at the forward end (claim 3). From the same point of view, the large diameter nut is assembled to the cylinder body so as to be relatively rotatable and relatively unmovable in the cylinder axis direction, and the rear end of the piston shaft is provided with an abutment portion where the rear end face of the small diameter nut abuts at the forward end of the piston. It may be provided (claim 4). Further, in the rotary cylinder of the present invention, a member for confirming the amount of rotation operation of the large-diameter nut based on mechanical feeling is provided (claim 5).

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show one embodiment of a rotary cylinder according to the present invention. A cylinder main body 1 of the rotary cylinder includes a front body 2 attached to a main shaft (not shown) of a lathe so as to be integrally rotatable, a rear body 4 connected to the front body 2 by bolts 3, and a rear body 4 protruding rearward. And a terminal member 7 connected to the rear end of the distribution shaft 5 with a bolt 6.

The front body 2 and the rear body 4 form a piston chamber 9 inside the cylinder body 1, and a piston 10 is slidable in the cylinder axial direction in a state where a piston 10 is prevented from rotating by a pin 11. Is housed. Piston 1
0, a connecting sleeve 12 that penetrates the front body 2 and a hollow piston shaft 13 that penetrates the distribution shaft 5 and projects rearward therefrom are integrally provided. The connecting sleeve 12 is connected to the chuck via a draw bar (not shown), and the chuck pawl is opened and closed as the piston 10 reciprocates.

A distributor 15 is mounted on the outer periphery of the distribution shaft 5 so as to be relatively rotatable by a pair of front and rear bearings 16 and 17, and a holding member 7 for holding the rear bearing 17 is mounted on the terminal member 7.
a is provided. A housing 18 is fixed to the outer periphery of the distributor 15 with bolts 19, and the housing 18 is provided with two supply / discharge ports 20 and 21 for hydraulic oil and one drain port 22. The distribution shaft 5 and the distributor 15 form a rotary joint of hydraulic oil, and the rotation-side piston chamber 9 and the fixed-side supply / discharge ports 20 and 21 are connected via an oil passage (not shown). For the detailed structure of the rotary joint, refer to Japanese Patent Application Laid-Open No. 9-1408 by the same applicant as the present application. Further, the housing 18 is prevented from rotating around the lathe body via a fork-like member for hooking a pipe fitting (not shown) connected to the drain port 22.

An end nut 2 is provided at the rear end of the piston shaft 13.
9 is screwed in and is prevented from loosening by a set screw 33. Between the end nut 29 and the cylinder body 1, a small-diameter nut 24 and a large-diameter nut 25 are provided on the outer periphery of the protruding portion of the piston shaft 13. A screw portion 24a is formed on the outer peripheral surface of the small diameter nut 24, and a key groove 24b is provided on the inner peripheral surface. Keyway 2 on piston shaft 13
The key 26 fitted in the key 4b is fixed, and the small-diameter nut 24 is inserted into the piston shaft 13 by the key groove 24b and the key 26 so as to be relatively non-rotatable and relatively movable in the cylinder axis direction.

A small-diameter nut 2 is provided on the inner peripheral surface of the large-diameter nut 25.
A screw part 25a screwed to the screw part 24a of No. 4 is formed,
The rear end face is provided with a tool retaining hole 25b as an operation unit for rotating the large diameter nut 25. Large diameter nut 25
A projection 25e is formed on the inner circumference of the rear end portion over the entire circumference,
A clamping ring 34 for clamping the projection 25e is connected to the end nut 29 by a bolt 32, and the large-diameter nut 25 is attached to the piston shaft 13 by the ring 34 so as to be relatively rotatable and relatively immovable in the cylinder axis direction. I have.

In the rotary cylinder according to this embodiment, the large-diameter nut 25 constitutes a member for adjusting the position of the small-diameter nut 24 on the piston shaft 13 in the cylinder axis direction by operating the cylinder from the rear. The terminal member 7 on the side of the cylinder body 1 constitutes a contact member with which the front end face of the small-diameter nut 24 abuts at the forward end of the piston 10. A notch 25 c is formed on the rear end surface of the large-diameter nut 25, and a spring 3 is formed on the end nut 29.
0 and the ball 31 are provided, and constitute a member for confirming the rotational operation amount of the large-diameter nut 25 based on the mechanical feeling when the ball 31 is engaged with the notch 25c.

On the other hand, a coolant collector 37 is attached to the rear end of the housing 18 via a spacer box 36. An opening 37a is formed in the rear wall of the coolant collector 37, and a cover 38 that covers the opening 37a is detachably attached with bolts 39. At the lower end of the coolant collector 37, a discharge port 37b for discharging the coolant flowing from the rear end of the piston shaft 13 is provided. A proximity switch 27 for confirming a stroke end behind the piston 10 and a proximity switch 28 for confirming a stroke end in front of the piston 10 are mounted at different positions in the circumferential direction above the coolant collector 37. Diameter ring 25
A dog 25d for operating the switches 27 and 28 is provided on the outer periphery of the rear end to protrude over the entire periphery.

Next, a method of adjusting the piston stroke of the rotary cylinder configured as described above will be described. To change the opening / closing stroke of the chuck pawl, first, as shown in FIG. 2, the piston 10 is stopped at the rear stroke end, the cover 38 is removed from the coolant collector 37, and the opening 37a is opened.
Next, the bolt 32 of the end nut 29 is loosened, the clamping ring 34 is separated from the end nut 29, and the large-diameter nut 25
Is released for rotation. Next, a wrench (not shown)
Is cut into the catch hole 25b of the large-diameter nut 25, the large-diameter nut 25 is rotated by an operation from the rear of the cylinder, and the small-diameter nut 24 is advanced to the cylinder body 1 side.

In this case, the rotational operation amount of the large-diameter nut 25 can be easily confirmed by the mechanical feeling when the ball 31 is engaged with the notch 25c. In addition, since the large-diameter nut 25 and the small-diameter nut 24 are screwed together with the threaded portions 25a and 24a, the rotational operation amount of the large-diameter nut 25 and the axial movement amount of the small-diameter nut 24 are made to correspond accurately, for example. , Two small nuts 24 per rotation of the large nut 25
mm, the stroke of the piston 10 can be adjusted accurately. The adjusted piston stroke can be easily and accurately determined by measuring the distance between the rear end surface of the coolant collector 37 and the rear end surface of the end nut 29. For example, in the case of FIG. 2, the distance L1 is measured at the backward end position (solid line position) of the piston 10, the distance L2 is measured at the forward end position (dashed line position), and the piston stroke is determined from the difference between these measured values. Can be

After adjusting to the required stroke, the bolt 32 of the end nut 29 is tightened, the projection 25e is clamped between the clamping ring 34 and the end nut 29, and the large diameter nut 25 is integrated with the piston shaft 13. Fix rotatably. Then, after the position of the proximity switch 28 is adjusted so that the front stroke end after the adjustment can be detected, the cover 38 is attached to the coolant collector 37, and a series of adjustment operations is completed. In this way, there is no need to remove or disassemble the cylinder main body 1 from the main shaft, and the stroke from the rear end position of the piston 10 can be performed by the operation from the rear of the cylinder without being hindered by the cover of the lathe. Adjustments can be made easily.

FIGS. 3 and 4 show another embodiment of the rotary cylinder according to the present invention. In this rotary cylinder, a large-diameter nut 25 is mounted on the cylinder body 1 side so as to be relatively rotatable and relatively immovable in the cylinder axis direction. That is, a projection 25f is provided on the inner periphery of the front end of the large-diameter nut 25, and a locking ring 43 for locking the projection 25f to the terminal member 7 of the cylinder body 1 through a minute gap.
Are attached with bolts 44. A notch 25g, a spring 41, and a ball 42 are provided between the large-diameter nut 25 and the terminal member 7, so that the large-diameter nut 2
A member for confirming the rotation operation amount of No. 5 is configured. At the forward end position of the piston 10, the rear end surface of the small-diameter nut 24 comes into contact with the front end surface of an end nut 29 as a contact member. Therefore, also in this embodiment, by rotating the large-diameter nut 25 from the rear of the cylinder, the stroke can be easily adjusted based on the backward end position of the piston 10.

In the above embodiment, the stroke is adjusted based on the backward end position of the piston 10.
The stroke may be adjusted based on the forward end position of the piston 10. In addition, the present invention is not limited to the above-described embodiment, and may be embodied by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention.

[0020]

As described above in detail, according to the rotary cylinder of the present invention, the regulating member for regulating one stroke end of the piston and the regulating member by operation from the rear are provided on the outer periphery of the protruding portion of the piston shaft. Since the adjusting member that adjusts the position in the cylinder axis direction on the piston shaft is assembled, an excellent effect that the stroke of the piston can be easily adjusted without removing or disassembling the cylinder body is achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary cylinder showing an embodiment of the present invention.

FIG. 2 is a sectional view showing a method of adjusting a piston stroke in the rotary cylinder of FIG.

FIG. 3 is a partial cross-sectional view of a rotary cylinder showing another embodiment of the present invention.

FIG. 4 is a sectional view showing a method of adjusting a piston stroke in the rotary cylinder of FIG. 3;

FIG. 5 is a sectional view showing a conventional rotary cylinder.

FIG. 6 is a sectional view showing another conventional rotary cylinder.

[Explanation of symbols]

1. Cylinder body, 5 Distribution shaft, 7 Terminal member,
10 · · · piston · 13 · · · piston shaft, 15 · · · distributor, 24 · · · small diameter nut, 25 · · · large diameter nut, 25
c, 25g-notch, 29-end nut, 30,
41. Spring, 31, 42. Ball.

Claims (5)

[Claims] A piston is housed inside a cylinder body that rotates integrally with a main shaft, and the piston is provided with a piston shaft that penetrates through the cylinder body and protrudes rearward. A rotary cylinder comprising a regulating member that regulates a stroke end and an adjusting member that adjusts the position of the regulating member on the piston shaft in the cylinder axis direction by an operation from behind. 2. A small-diameter nut having a threaded portion on the outer periphery is used as the regulating member, a large-diameter nut having a threaded portion on the inner periphery is used as the adjusting member, and the small-diameter nut cannot rotate relative to the piston shaft and is relatively moved in the cylinder axis direction. 2. The rotary cylinder according to claim 1, wherein the rotary cylinder is movably fitted, the large-diameter nut is screwed to the small-diameter nut, and the operating portion is provided at the rear end of the large-diameter nut. 3. A large diameter nut is attached to the piston shaft so as to be relatively rotatable and relatively unmovable in the cylinder axis direction, and a contact member is provided at the rear end of the cylinder body where the front end surface of the small diameter nut contacts the forward end of the piston. 3. The rotary cylinder according to claim 2, wherein: 4. A large diameter nut is assembled to a cylinder body so as to be relatively rotatable and relatively unmovable in the cylinder axis direction, and a rear end of a piston shaft is provided with an abutting member portion at which a rear end surface of the small diameter nut abuts at a forward end of the piston. 3. The rotary cylinder according to claim 2, wherein the rotary cylinder is provided. 5. The rotary cylinder according to claim 2, further comprising a member for confirming a rotation operation amount of the large-diameter nut based on a mechanical feel.