JPS6212487Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a finger chuck that is used by being attached to the spindle of a machine tool.It is capable of grasping the gripping range of the jaw in an extremely short period of time, and also ensures dust-proofing within the chuck body. The purpose of this invention is to provide a compact finger chuck that enables the user to perform the following tasks.

Next, embodiments of the present application will be described based on the drawings.

Reference numeral 1 denotes a chuck body with a hollow interior, and in this embodiment, it is attached to an annular front body 2 with an L-shaped cross section, and to the rear side of this front body 2 (the right side is referred to as the front side and the left side is referred to as the rear side in Fig. 1). It consists of an annular rear main body 4 fixed with bolts 3 and a pilot bushing 6 fixed to the front side of the front main body 2 with mounting bolts 5 so as to cover the center thereof.
Reference numeral 7 denotes a cover plate fixed to the rear side of the rear main body 4 by a mounting bolt 8 that can be operated from the front of the chuck main body 1, and can be attached to a spindle (not shown) with a mounting bolt 9. ing. Reference numeral 10 denotes a spider housed in the hollow chamber 11 of the chuck body 1, and its central shaft portion 10a is fitted into the central hole 7a of the cover plate 7 so as to be slidable in the chuck axis direction. A connecting bolt 12 that can be operated from the front of the chuck body is attached to the central shaft portion 10a.
It can be connected to a drawbar (not shown). Next, on the front surface of the front main body 2, long sliding holes 13 extending in a radial direction (including a substantially radial direction) centering on the chuck axis are provided at positions dividing the chuck axis into four equal parts. There is. Guide protrusions 14a and 14b are formed on both side surfaces of the sliding elongated hole 13, as shown in FIGS. 4 and 5, respectively, and guide protrusions 14a and 14b are formed on both end surfaces at opposing positions as shown in FIG. Holes 15a and 15b are formed in a penetrating shape, respectively. In addition, the above-mentioned insertion hole 15 is provided on the circumferential surface of the front main body 2.
A bearing accommodating recess 16 is formed in a portion surrounding a, and a bearing 17 is fitted into this bearing accommodating recess 16 and fixed with a mounting bolt (not shown). Furthermore, a lid storage recess 18 is formed on the front surface of the front body 2 and the pilot bushing 6 in a portion surrounding the sliding elongated hole 13. A sliding block 19 is fitted into the sliding slot 13 so as to be slidable in the longitudinal direction. This sliding block 19 is the front block 1
9a and a rear block 19b, and with these front and rear blocks 19a and 19b sandwiching the guide protrusions 14a and 15b from the front and rear sides, a bolt (not shown) is inserted. omission)
are joined together by. This sliding block 19 has a shaft hole 20 parallel to the chuck axis and a female screw hole 21 parallel to the sliding direction. This female threaded hole 21 is formed so that its axis passes through the chuck axis as shown in FIG. . A pawl shaft 23 having a pawl 22 at its front end is fitted into the shaft hole 20 so as to be slidable and rotatable in the axial direction. A cam groove 24 is formed on the outer periphery of the pawl shaft 23 in the same manner as a known cam groove, and a cam pin 25 screwed onto the sliding block 19 is fitted into this cam groove 24, so that the pawl shaft 23 is moved from the forward end. When slid to the reverse end, the pawl 22 is rotated from the state shown by the imaginary line in FIG. 2 to the state shown by the solid line. Incidentally, the cam groove 24 and the cam pin 25 can also be formed by forming the cam groove 24 on the sliding block 19 and attaching the cam pin 25 to the pawl shaft 23. The rear end of the pawl shaft 23 is fitted into a long fitting hole 26 formed in the spider 10 so as to face each sliding hole 13 so as to be movable in the longitudinal direction. It is attached and prevented from coming out. Bearing 1 is installed in the female threaded hole 21.
A feed screw shaft 29 rotatably supported by the pilot bushing 7 and the pilot bushing 6 is screwed together, and by rotating the feed screw shaft 29, the sliding block 19 slides in the radial direction. It is becoming more and more popular. A fitting part 29a is provided at the outer peripheral end of the feed screw shaft 29, into which a wrench or the like is fitted and rotated from the outside. A gear storage recess 3 is located at the center of the rear surface of the pilot bushing 6.
0, and a gear fitting hole 31 and a through hole 32 centered on the chuck axis are formed on the bottom surface of the gear housing recess 30, respectively. Above feed screw shaft 2
The center end of the pilot bushing 9 projects into the gear storage recess 30 of the pilot bushing 6, and a bevel gear 33 is wedged onto the center end. This bevel gear 33 is meshed with a synchronized bevel gear 34 that is rotatably fitted into the gear fitting hole 31, and at the same time, extraction of this synchronized bevel gear 34 is prevented. The above-mentioned through hole 32
is a washer member 3 fitted onto the connecting bolt 12.
A dustproof pipe 36 screwed onto the gear hole 34a is slidably fitted through the gear hole 34a. Next, a bellows lid 37 as shown below is stored in the lid storage recess 18. This bellows lid 37 is overlapped with a central lid plate 38 that is fitted onto the front surface of the sliding block 19 without any gaps, and in the lid storage recess 18 on the center side and the outer peripheral side of the sliding block 19, respectively. a plurality of sliding lid plates 39 (four in the drawing);
It is comprised of an edge frame member 40 attached to the front surface of the chuck body 1 so as to cover the edges of each cover plate 38, 39. As shown in FIGS. 6 and 7, each of the sliding lid plates 39 has an inner engaging portion 39a on the rear surface of the end on the side of the sliding block 19, and an outer engaging portion 39b on the front surface of the opposite end. A support piece 39c is provided on the rear surface of the anti-sliding block 19 side, and a side plate 39d is provided on the front surface of both side edges, and the outer engaging portion 39b of this cover plate 39 engages with the inner engaging portion 39a of the cover plate 39 adjacent to the front. The sliding lid plates 39 and the side plates 39d are overlapped with each other so as to fit together. In addition, as shown in FIGS. 8 and 9, the central lid plate 38 has an engaging part 38a on both side edges on the front surface of the distal end that can be engaged with the inner engaging part 39a of the rearmost sliding lid plate 39. A side plate 38b that overlaps with the side plate 39d is formed on each side, and the outer engaging portion 3 of the frontmost sliding lid plate 39 is formed on the rear surface of the edge frame member 40.
9b is formed, and when the sliding block 19 slides, each sliding cover plate 39 and the side plate 3
9d appears in a bellows shape.

When a workpiece is to be gripped by using the finger chuck constructed as described above, first, the drawbar is advanced by a fluid cylinder or the like to move the spider 10 to the advanced end, and each of the jaw shafts 23 is
The claw 22 is oriented horizontally as shown by the imaginary line in FIG.
Then, the workpiece is placed on the center of the front surface of the chuck body 1. Then, the drawbar is moved backward to move the spider 10 rearward, and the jaw shafts 23 are aligned.
The jaw shafts 23 are then pulled rearward, causing each jaw 22 to slide rearward and rotate, and each jaw 22 faces the center of the workpiece as shown by the solid lines in Fig. 2, and in this state the jaws 22 are moved rearward to grip the workpiece between them and the chuck body 1. The outer diameter of the workpiece that can be gripped in the above manner is affected by the distances R and r from the chuck axis of the jaws when gripped and released, and the gripping range is limited to a value of 2r to 2R.

Next, when it is desired to adjust the grasping range, a wrench or the like is fitted into the fitting portion 29a of any one of the feed screw shafts 29 in the open state to rotate the feed screw shaft 29. As a result, this feed screw shaft 2
The sliding block 19 screwed into the spider 10 slides in the radial direction, and the pawl shaft 23 fitted into the shaft hole 20 of the sliding block 19 moves within the fitting elongated hole 26 of the spider 10. Together with the sliding lid plate 3 of the bellows lid 37
9 while sliding in the radial direction. Further, due to the rotation of the feed screw shaft 29, the synchronized bevel gear 34
is rotated, the other feed screw shafts 29 are also rotated in the same manner in synchronization with the rotation of the feed screw shaft 29, and as a result, each of the four pawl shafts 23 is simultaneously moved synchronously in the radial direction. Ru. Therefore, the operator can determine the positions of all the claw shafts 23 by focusing on any one of the claw shafts 23 and setting the position of this claw shaft 23 with respect to the chuck axis to a position that satisfies the desired grasping range. can be set in place at the same time, claw 2
The grasping range of 2 can be adjusted very easily and quickly. In the above case, since each of the claw shafts 23 is moved synchronously, mutual displacement of the claw shafts 23 due to adjustment of the grasping range is reliably prevented.
The rotational balance of the entire finger chuck is always maintained well. Furthermore, when adjusting the gripping range as described above, each claw shaft 23 moves while sliding the sliding lid plate 39 of the bellows lid 37 in a bellows shape, so that the gripping range is adjusted each time. The complicated work of removing and repositioning can be omitted, and the work of adjusting the grasping range can be completed in a short time. Moreover, as mentioned above, the front of the long sliding hole in the chuck body 1 is always closed by the bellows lid, so the interior of the chuck body 1 is reliably dust-proofed, and chips, etc. are kept inside the chuck body 1 during use. There is no possibility of intrusion.

In addition, although the case where the number of claws is four was shown in the said Example, it is not limited to this number of claws.

As described above, in the present invention, the sliding blocks are fitted into the radial long sliding holes provided on the front surface of the chuck body so as to be slidable in the longitudinal direction, and the shaft holes of these sliding blocks The claw shaft is fitted into the slide block, and the feed screw shaft, which can be rotated from the outside, is screwed into the female screw hole parallel to the sliding direction of these sliding blocks. By rotating the shaft, the radial position of the jaw shaft relative to the chuck axis can be changed, which allows the gripping range of the jaw to be adjusted over a wide range, making it suitable for workpieces of various diameters. can do. Furthermore, even if the chuck main body is provided with radial sliding slots so that the radial position of each claw shaft can be changed as described above, each sliding slot is provided on the front surface of the chuck body. A lid storage recess is provided that surrounds the chuck, and a bellows lid is assembled into this lid storage recess so as to close the long sliding hole and allow the claw shaft to move in the radial direction. It is dust-proof and has the effect of maintaining performance over a long period of time, and it also eliminates all the troublesome work such as removing and changing the position of the lid member when adjusting the gripping range mentioned above. This has the effect that the gripping range can be adjusted quickly and the time required for setup changes can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, in which Fig. 1 is a partially cutaway vertical sectional view, Fig. 2 is a partially omitted front view, and Fig. 3 is a view taken along the - line in Fig. 1. An enlarged sectional view, FIG. 4 is an enlarged sectional view taken along the - line in FIG. 2,
Figure 5 is an enlarged sectional view taken along the - line in Figure 2, Figure 6 is a front view showing the sliding lid plate of the bellows lid, Figure 7 is a sectional view taken along the - line in Figure 6, and Figure 8 is the central lid plate. FIG. 9 is a sectional view taken along the - line in FIG. 8. 1...Main body, 10...Spider, 13...Sliding long hole, 18...Lid storage recess, 19...Sliding block, 20...Shaft hole, 21...Female screw hole, 23...
Claw shaft, 26... Fitting elongated hole, 29... Feed screw shaft,
37... Bellows lid.

Claims (1)

[Scope of utility model registration request] On the front surface of the chuck body, sliding slots in the radial direction centered on the chuck axis are provided at multiple locations equidistant from the chuck axis, and lid storage recesses are provided to surround these sliding slots. The spider is provided with a spider movable in the axial direction of the chuck body, the spider is provided with a fitting long hole in a portion facing each of the above-mentioned respective long sliding holes, and a sliding block is respectively provided in each of the above-mentioned long sliding holes. These sliding blocks are fitted so as to be slidable in the longitudinal direction, and a shaft hole parallel to the chuck axis line and a female threaded hole parallel to the sliding direction are respectively provided in the sliding blocks, and claw shafts are respectively fitted into these shaft holes. The rear end of the claw shaft is fitted into the long fitting hole to prevent it from coming out, and one of the outer periphery of each claw shaft and the inner periphery of the shaft hole is provided with a cam groove, and the other is provided with a cam groove. The shape of the cam groove is set so that when the claw shaft is slid backward, the claw shaft rotates in the direction of gripping the workpiece. The feed screw shafts rotatably supported by the screw shafts are screwed together, and a bellows lid is installed in each of the lid storage recesses so as to close the long sliding hole and allow the claw shaft to move in the radial direction. A finger chuck that is characterized by being made of.