JPH0966407A - Finger chuck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correspond to the change of a work size simply and quickly, in a finger chuck. SOLUTION: A lever support body 24 is installed to a chuck main body 1 so as to be able to change a diameter direction position. A support pin 34 is provided on a grasping lever 33 and a hook shape guide long hole 31 for guiding and regulating the movement of a fulcrum pin 34 is provided on the lever support body 24. The guide long hole 31 is composed of an axial direction guide hole in parallel with a chuck axis and a slant guide hole. On at least one side of the chuck main body 1 and the lever support body 24, a positioning pin hole and a numerical signal are provided in order to indicate the diameter direction position for the chuck main body 1 of the lever support body 24 so as to facilitate the confirmation of the installed position of the lever support body 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finger chuck suitable for turning aluminum wheels and the like, and more particularly to a finger chuck in which a grip lever is opened and closed via a spider as a draw sleeve moves. .

[0002]

2. Description of the Related Art A conventional finger chuck, for example, as disclosed in Japanese Utility Model Laid-Open No. 4-13207, swings an intermediate portion of a gripping lever through a V-shaped groove and a supporting pin on an outer peripheral portion of a chuck body. It is movably installed, and the rear end of the gripping lever is connected to a spider that is moved back and forth by a draw sleeve, and the gripping lever is swung by the forward and backward movement of the spider so that the work piece is gripped by the gripping claw at the front end of the gripping lever. is there.

[0003]

In the conventional finger chuck, since the work gripping position when the gripping claw is moved in the axial direction to grip the work is restricted to a predetermined radial position, the gripping is restricted. When the outer diameter of the work to be changed is changed, it is necessary to replace the gripping lever with the work size. Therefore, conventionally, it is necessary to manufacture a grip lever corresponding to the size of the work to be gripped as a replacement part, which causes an increase in manufacturing cost and requires a storage place for the replacement part. In this case, there is a problem that it takes a lot of time to replace the grip lever.

[0004]

In order to solve the above-mentioned problems, in the invention of claim 1, a plurality of grips provided tiltably on the outer peripheral portion of the chuck body by forward and backward movement of a spider disposed in the chuck body. In a finger chuck in which a lever is tilted, a chuck body is provided with a lever support body capable of changing its radial position, a gripping lever is provided with a fulcrum member serving as a tilt fulcrum, and the lever support body is restricted from moving. It is characterized by being provided with a hook-shaped guide portion. In a second aspect of the present invention, in a finger chuck in which a plurality of gripping levers tiltably provided on the outer peripheral portion of the chuck body are tilted by forward and backward movement of a spider disposed in the chuck body, the chuck body is lever-supported. The body is provided so that it can move in the radial direction, and the gripping lever is provided with a fulcrum member that serves as a tilting fulcrum. And a hook-shaped guide portion for restricting the movement of the fulcrum member is provided. According to the invention of claim 3, in a finger chuck in which a plurality of gripping levers tiltably provided on the outer peripheral portion of the chuck body are tilted by forward and backward movements of a spider disposed in the chuck body, the finger support is supported by the chuck body. The body is provided so that its position in the radial direction can be changed, and at least one of the chuck body and the lever support is provided with a display section for displaying the radial position of the lever support with respect to the chuck body, and the gripping lever is provided with a fulcrum member serving as a tilt fulcrum. The lever support is provided with a hook-shaped guide portion for restricting the movement of the fulcrum member.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a lever support is provided on a chuck body so that its position in the radial direction can be changed. The lever support may be provided so that the radial position can be continuously changed by using the mounting bolt and the long hole for the chuck body, or the mounting bolt and the plurality of mounting holes can be used for the chuck body. For example, the position may be changed in the radial direction step by step. The grip lever is provided with a fulcrum member serving as a tilt fulcrum. This fulcrum member generally uses a support pin,
It may be a support protrusion or the like. The lever support is provided with a hook-shaped guide portion that restricts the movement of the fulcrum member. It is preferable that the hook-shaped guide portion includes an axial guide portion that is parallel to the chuck axis and an inclined guide portion that is diagonally forward from the front end portion of the axial guide portion to the outside in the radial direction. The axial guide portion of the portion is kept parallel to the chuck axis even if the radial position of the lever support is changed.
The guide portion is generally formed by a V-shaped elongated hole or groove, but it is free to be deformed within a range that does not interfere. At least one of the chuck body and the lever support is provided with an appropriate display part such as a pin, marking or display for indicating the radial position of the lever support with respect to the chuck body, so that the operator can easily find the desired position. It is made recognizable. It is convenient to use a number corresponding to the workpiece diameter as the display.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a finger chuck according to the first embodiment, in which a chuck body 1 is a cup-shaped rear body 2 attached to a spindle (not shown) of a machine tool,
It is composed of a plate-shaped front body 3 (generally referred to as a front plate) integrally fixed to the front surface of the rear body 2 with mounting bolts 4. A draw sleeve 8 connected to an actuator (not shown) on the spindle side is slidably inserted in the chuck axial direction into a guide hole 6 of a guide sleeve 5 fixed to the center of the rear body 2.

The draw sleeve 8 is provided with a support cylinder 11 so as to be movable integrally therewith, and a small diameter portion 11a of the front projection portion of the support cylinder 11 is provided.
The spider 12 is inserted in the so that it can be tilted slightly. A spherical seat 13 is interposed between the spider 12 and the large-diameter portion 11b of the support cylinder 11, and the spider 12 is tiltably supported with respect to the draw sleeve 8 via the spherical seat 13. A narrow gap that allows the tilting of the spider 12 is provided in the relative portion between the draw sleeve 8 and the spider 12. A coil spring 7 that urges the spider 12 forward is interposed between the spider 12 and the rear body 2. The spider 12 has a connecting portion 12a at a position that divides the outer circumference into three equal parts, which penetrates the opening 2a of the rear body 2 and projects to the outside of the chuck body 1.

A through hole 14 is formed in the center of the front body 3, and a closing member 15 for closing the through hole 14 is detachably fixed to the center of the front surface of the front body 3. At the center of the rear surface of the closing member 15, a support portion 15a to be inserted into the support cylinder 11 is provided in a protruding manner. An air passage 15b for seating confirmation is formed in the closing member 15, and an air supply pipe 17 is connected to the support portion 15a. In addition, an annular holding body 18 constituting a centering device is fixed to the central portion of the front body 3 so as to surround the closing member 15. A centering body 19 is fitted in the holding body 18 so as to be movable back and forth. The centering body 19 is biased forward by a plurality of springs 20 and a plurality of retaining pins 21 fixed to the holding body 18.
Has been stopped by. A centering tool 19a having a shape corresponding to the work W is replaceably fixed to the center of the front surface of the centering body 19.

Next, a radial fitting groove 22 is formed on the outer peripheral portion of the front body 3 at a position facing the connecting portion 12a of the spider 12, and the fitting groove 22 is sandwiched on both sides. Mounting portions 23 are provided on the front surface, respectively. Each mounting part 23
A mounting screw hole 23a, a large number of serrations 23b perpendicular to the radial direction, and a plurality of positioning pin holes 23d having different radial positions are formed therein. Fitting groove 2
A pair of lever support portions 24b provided on a lever support body 24 having a lever fitting groove 24a are fitted in 2 so as to be movable in the radial direction. A pair of mounting pieces 24c provided on the lever support 24 are respectively attached to the respective mounting portions 23, and serrations 24d formed on the rear surface of the mounting pieces 24b.
Is engaged with the serration 23b of the mounting portion 23.
The serrations 23b of the mounting portion 23 and the serrations 24d of the mounting piece 24b constitute an anti-shear element provided on the fastening surface to prevent the lever support 24 from moving relative to the chuck body 1. The mounting piece 24c has a long mounting hole 2 that is long in the radial direction.
5 and through the mounting long hole 25, the mounting screw hole 23a
It is fastened to the mounting portion 23 by a mounting bolt 26 screwed into the. Further, a positioning pin 28 that can be fitted into one positioning pin hole 23d is planted in the mounting piece 24c so as to project rearward. On the lever support 24, a receiving seat 29 for receiving a work W such as an aluminum wheel is provided with a mounting bolt 30.
It is fixed so that it can be replaced. The plurality of positioning pin holes 23d are provided in the chuck body 1 of the lever support 24.
And a display unit for displaying the radial position with respect to.
The display portion may be constituted by a display line, a numerical symbol or the like formed or drawn on the front surface of the front body 3.

A pair of lever support portions 2 of the lever support 24.
Reference numeral 4b denotes an axial guide hole 31a which is an axial guide portion parallel to the chuck axis and an inclined guide hole which is an inclined guide portion which is continuous radially outward from the front end of the axial guide hole 31a. A guide elongated hole 31 exemplified as a hook-shaped (V-shaped) guide portion composed of 31b is formed. An intermediate portion of the gripping lever 33 is fitted in the fitting groove 24a of the lever support 24, and both ends of the support pin 34 exemplified as a fulcrum member fixed to the intermediate portion in a penetrating manner are provided at the lever support portion 24.
It is fitted into the guide slot 31 of b, and as a result, the grip lever 33
Is supported so that it can tilt and move back and forth. The rear end of the grip lever 33 is rotatably connected to the connecting portion 12a of the spider 12 via a connecting pin 35. At the front end of the gripping lever 25, a gripping claw 37 that presses and grips the front surface of the outer peripheral edge of the work W against the seat 29 is fastened and fixed.

A seat holding member 40 is fixed to the front surface of the outer peripheral portion of the front body 3 via mounting bolts 42 at positions where the outer periphery is divided into three equal parts and between the lever support members 24. . A work seat 41 is fitted to the seat holding body 40 so as to be movable back and forth by a predetermined amount, and is biased forward by a spring 42. The seat holding body 40 and the work seat 41 are formed with communication holes 40a and 41a for seating confirmation, which communicate with each other when the work seat 41 is pushed to a predetermined position. The communication hole 41a of the work seat 41 communicates with the air passage 15b of the closing member 15 through the air passage 3d provided in the front body 3, and the work W is seated on the basis of a change in the air pressure supplied from the air passage 15b. It can be detected. On the front surface of the front body 3, there are mounting bolts 4
2 for screwing together 2 and air passage 3d for seating confirmation
Communication holes 44 are provided at three different positions in the radial direction of the chuck, and the radial mounting position of the seat holding member 40 can be selectively changed according to the diameter of the work W. The unused communication hole 44 is closed by a plug 45.

In the finger chuck constructed as described above, when the work W is mounted on the finger chuck, as shown in FIG. 1, first, the center hole of the work W is fitted into the centering tool 19a to perform centering. The main body 19 is pushed slightly against the spring 20 and the rim portion is brought into contact with the seat 29. In that state, when the draw sleeve 8 is pulled backward by the actuator, the spider 12 is retracted while compressing the coil spring 7, and the spider 12 is moved by the gripping levers 3.
Pull the rear end of 3 to the rear and move it. As a result, the support pin 34 of the gripping lever 33 is moved from the tilt guide hole 31b of the guide elongated hole 31 to the axial guide hole 31a in the chuck center direction, the gripping lever 33 is tilted and the gripping claw 37 is closed, and then the support pin 34 is closed. The gripping claw 37 presses the rib portion of the aluminum wheel, which is the work W, against the receiving seat 29 and is gripped by the gripping claw 37 being guided by the axial guide hole 31a and being drawn backward. As a result, the work W is securely attached to the finger chuck with the center thereof being centered.

Next, in order to process the work W, when the spindle is rotated to rotate the chuck body 1, a centrifugal force acts on the lever support 24 and the gripping lever 33, and the lever support 24 is radially moved. A large force acts on the outside, and the lever support 24 tries to move in the outer peripheral direction. However,
Serrations 23b and 2b serving as anti-shear elements are attached to the attachment portion 23 of the chuck body 1 and the attachment piece 24b of the lever support 24.
4d is formed and these serrations 23b, 24d are formed.
When the lever support 24 is engaged with the chuck body 1
Since it is attached to the lever support 24, a large force acting on the lever support 24 is reliably received by the serrations 23b and 24d, and the lever support 24 is not displaced. This means that the chuck body 1 can be rotated at a high speed, and it can be used for processing aluminum wheels at 3000
r. p. It is possible to sufficiently cope with high speed rotation of about m.

Next, when the work W is released, the draw sleeve 8 is moved forward by the actuator, and the spider 12 is moved forward while being biased forward by the coil spring 7 to move the gripping levers. 33 is moved forward. As a result, as shown by the phantom line in FIG. 1, the support pin 34 of the gripping lever 33 is guided from the axial guide hole 31a to the inclined guide hole 31b and moved in the outer peripheral direction, and the gripping lever 33 is tilted to the outer peripheral side and gripped. The claw 37 releases the work W. In this case, since the grip claw 37 is largely opened by the movement of the support pin 34 in the outer peripheral direction, the work W can be easily attached and detached from the front.

Next, when mounting a work W having a greatly different diameter, the lever support 24 is loosened with the mounting bolt 26 tightening the lever support 24 being loosened as shown in FIG. And the positioning pin 28 is fitted into the positioning pin hole 23d at a desired position and the serrations 23b and 24d are engaged with each other, and in that state, the mounting bolt 26 is tightened again to fix the lever support 24. It is fixed to the chuck body 1. In this case, the radial position of the lever support 24 can be easily recognized by the position of the positioning pin hole 23 into which the positioning pin 28 is fitted, that is, the position of the positioning pin hole 23, or by the separately displayed numbers or letters. When the radial position of the lever support 24 is changed as described above, the radial position of the guide elongated hole 31 that guides the support pin 34 of the lever support 24 is changed, and the tilt angle of the lever support 24 is changed. As a result, the radial position of the grip claw 37 is changed, and the radial position of the receiving seat 29 is also changed integrally with the lever support 24, so that it is possible to easily cope with works W having different diameters. Even if the radial position of the lever support 24 is changed as described above, the axial guide hole 31a of the guide long hole 31 is maintained in parallel with the chuck axis, so that the gripping and releasing of the work W is performed in the same manner as above. You can do it. Further, in accordance with the change in the radial position of the lever support 24, the mounting bolt 42 of the seat holding body 40 is removed, the radial position of the seat holding body 40 is changed, and the mounting bolt 42 is moved into a screw hole having a different radial position. 43, screwed onto the work piece 43
Change the radial position of. In this case, the unused communication hole 44 is closed by the plug 45.

Next, FIGS. 7 to 9 show a finger chuck of the second embodiment, in which a key groove 50 constituting an anti-shear element is provided at a portion other than the fastening surface between the chuck body 1 and the lever support 24. It is a thing. That is, a large number of key grooves 50 in the chuck axial direction are formed at equal pitches only on the rear portions of both side surfaces of the fitting groove 22 provided on the outer peripheral portion of the front body 3. A large number of key pieces 51, which can be engaged with and disengaged from the front, are formed in the key groove 50 at equal pitches on at least a rear portion of the side surface of the lever support portion 24b of the lever support 24. The key groove 50 may be provided in at least the front part of both side surfaces of the fitting groove 22, and the key piece 51 may be provided in the front part of the side surface of the lever support portion 24b, or only in the central part of both. A sufficient space is formed between the rear end portion of the guide elongated hole 31 and the support pin 34 so that the lever support 24 can be moved forward to a position where the key groove 50 and the key piece 51 are disengaged. . Also, positioning pin holes 23d are provided corresponding to the respective key grooves 50 in the desired area. in this case,
Since a large force acting on the lever support 24 in the outer peripheral direction is received by the engagement of the key groove 50 and the key piece 51, the diameter of the positioning pin 28 can be reduced, and as a result, the pitch for providing the positioning pin hole 23d can be reduced. The position of the lever support 24 can be easily finely adjusted. The mounting portion 23 of the front body 3 is engraved with numeral symbols 13 to 18 exemplified as a display portion at positions corresponding to the respective key grooves 50 in a desired area. These numeral symbols 52 indicate the work W to be gripped.
Shows the inch value indicating the size of the diameter, and it is possible to easily change the position of the lever support 24 by visual inspection.

In the second embodiment, the lever support 24
When changing the radial position of the lever, the lever support 24 is moved forward with respect to the chuck body 1 with the mounting bolt 26 loosened, and the key groove 50 and the key piece 51 are disengaged. At the desired position where the radial position of the support 24 is changed, the lever support 24 is moved backward to engage the key piece 51 with the key groove 50 at the desired position and the positioning pin 2
8 into the corresponding positioning pin hole 23d,
In this state, the mounting bolt 26 is screwed into the mounting screw hole 23a and fastened. As a result, the radial position of the lever support 24 is changed, and it is possible to deal with works W having different diameters. Further, since the key groove 50 and the key piece 51 are engaged with each other, a large force acting on the lever support 24 due to the rotation of the chuck body 1 can be reliably received by the key groove 50 and the key piece 51. It can handle high-speed rotation of the main body 1.

Next, FIGS. 10 to 12 show a finger chuck of the third embodiment, which is a mounting portion 2 of the chuck body 1.
3 attach the mounting piece 24c of the lever support 24 to the mounting bolt 26
It is the one that is directly crimped by. This third
Although the anti-shear element is omitted in the embodiment, the radial position of the lever support 24 can be easily changed and the work W having a different diameter can be easily dealt with as in the above embodiment. In addition, one mounting screw hole 23a is provided in each mounting portion 23, and the mounting piece 2
Although the mounting elongated hole 25 is provided in 4c, a plurality of mounting screw holes may be provided in each mounting portion 23, and one mounting hole may be provided in the mounting piece 24c to accommodate the position change.

[0019]

As described above, according to the invention of claim 1,
Since the chuck body is provided with a lever support capable of changing the radial position, the gripping lever is provided with a fulcrum member serving as a tilt fulcrum, and the lever support is provided with a hook-shaped guide portion for restricting the movement of the fulcrum member. By changing the position of the support in the radial direction, the inclination of the gripping lever can be changed to easily change the radial position of the workpiece gripping position, and as a result, there is no need to replace the gripping lever when the diameter of the workpiece changes. This makes it possible to dispense with the production of gripping parts such as replacement gripping levers, and save the storage space for replacement gripping parts, which is economical. Further, since the position of the lever support can be changed for the change of the work diameter, the setup work associated with the change of the work diameter can be speeded up and the working efficiency can be improved. According to the second aspect of the present invention, the lever support is provided with the axial guide portion parallel to the chuck axis and the inclined guide portion that is continuous from the front end portion of the axial guide portion to the outer side in the radial direction obliquely forward. Therefore, even if the radial position of the lever support is changed, the fulcrum member of the gripping lever can always be guided by the axial guide portion parallel to the chuck axis when gripping the work, and the work can be gripped efficiently and reliably. According to the third aspect of the present invention, at least one of the chuck body and the lever support is provided with the display portion for displaying the radial position of the lever support with respect to the chuck body. Therefore, the radial position of the lever support is changed. When
By recognizing the display portion, the lever support can be easily changed to a position corresponding to the diameter of the work, and the position of the lever support can be changed quickly and accurately.

[Brief description of drawings]

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

FIG. 2 is a front view of the finger chuck of FIG.

3 is a plan view of a grip lever portion of FIG. 1. FIG.

FIG. 4 is a partial side view showing the relationship between a grip lever and a lever support.

FIG. 5 is a partial front view showing a lever support attachment portion of the chuck body.

FIG. 6 is a partial front view showing the operating state of FIG.

FIG. 7 is a cross-sectional view of a main part showing a second embodiment.

FIG. 8 is a front view of FIG. 7;

9 is a front view of the lever support body and the gripping lever of FIG. 7 omitted.

FIG. 10 is a sectional view of an essential part showing a third embodiment.

11 is a front view of FIG.

FIG. 12 is a front view of the lever support body and the gripping lever of FIG. 10 omitted.

[Explanation of symbols]

1 chuck body, 12 spider, 23d positioning pin hole (display part), 24 lever support, 31 guide elongated hole (guide part), 31a axial guide hole (axial guide part), 31b axial guide hole (axial direction) Guidance section), 33
Grip lever, 34 support pin (fulcrum member), 52 numeral symbol (display section).

Claims (3)

[Claims] 1. A finger chuck in which a plurality of gripping levers tiltably provided on an outer peripheral portion of a chuck body are tilted by forward and backward movements of a spider disposed in the chuck body, and a lever support is provided on the chuck body. A finger chuck in which a fulcrum member serving as a tilting fulcrum is provided in a position that can be changed in a radial direction, and a hook-shaped guide portion that restricts movement of the fulcrum member is provided in a lever support body. 2. A finger chuck in which a plurality of gripping levers tiltably provided on the outer peripheral portion of the chuck body are tilted by forward and backward movements of a spider disposed in the chuck body, wherein a lever support is provided on the chuck body. The gripping lever is provided so as to be movable in the radial direction, and a fulcrum member that serves as a tilting fulcrum is provided. A finger chuck having a tilted guide portion and a hook-shaped guide portion for restricting the movement of the fulcrum member. 3. A finger chuck in which a plurality of gripping levers tiltably provided on the outer peripheral portion of the chuck body are tilted by forward and backward movements of a spider disposed in the chuck body, and a lever support is provided on the chuck body. In addition to providing a position changeable in the radial direction, an indicator for displaying the radial position of the lever support with respect to the chuck body is provided on at least one of the chuck body and the lever support, and a fulcrum member serving as a tilting fulcrum is provided on the gripping lever. A finger chuck in which a hook-shaped guide portion for restricting the movement of the fulcrum member is provided on the support.