SU916119A1 - Automatic driver chuck - Google Patents

Description

The invention relates to a machine tool, in particular, to clamping devices and can be used for fastening parts such as rotation bodies when machining on lathes in centers.

The driven cartridges are known with self-jammed spring-loaded cams placed in their casing, equipped with a turning drive for each cam [I].

The closest to the proposed technical essence and the achieved result is an automatic flooded cartridge, in the case of which eccentric self-tightening spring-loaded cams, sliders, spherical stop, center and rotation drive of cams are installed [23.

The disadvantages of the known designs of the powered cartridges is the impossibility of clamping machined parts such as stepped shafts, in which the size from the base end of the small dia2

meters to the end of a larger diameter,: interacting with the latch, has significant deviations from the nominal.

They are also unreliable to fix and base the cams, and their production is laborious, since the cams either bo fixed on the cantilever axis, or the cam axis has two supports and the cam itself has a complex shape.

The purpose of the invention is the expansion of technological capabilities and improvements. precision fixing parts.

This goal is achieved by the fact that the drive rotation of the Cams made in the form of pushers in contact with a spherical stop installed with the possibility of axial movement, and spring-loaded strips associated with the fingers, designed to interact with the Cams, while the cams are made protrusions designed to accommodate them in the slots of the sliders.

3 91

FIG. 1 shows the cartridge with. Torn out, frontal view; in fig. 2A-A in FIG. I.

The cartridge consists of a faceplate 1, on which a floating body 2 with a lid'3 is dressed. Between the gear bases 4 on the body 2 there are fixed mobile sliders 5. In the radial holes of the body 2 there are pushers 6 with bevels with bars 7 fixed in them bodies 2. The strips are pressed by springs 8. A spherical stop 9 is fixed on the conical face of the faceplate 1, fixed by a non-rigid connection with the center 10. The eccentric cams 12, 1 are inserted into the slots 11 of the sliders 5 and are locked with the axes 13 with keys 14.

The axles 13 are prevented from falling out by screws 15. At the ends of the axles 13, pins 16 protrude, which fit into the grooves of the fingers 17, located in the sliders 5 in a plane passing through the axes of the pushers 6 with the strips 7 and the springs 8. The pins 17 are under the action of the springs 18. In the groove of the sliders 5 on the axes 19 are located centrifugal latches 20 with fasteners 21 fixed in them, entering into the grooves of the cams 12. The latches 20 are pressed by spring-loaded fingers 22.

The device works as follows.

In the initial position, the eccentric cams 12 are in the “part-unclasped” position and fixed with latches 21. The center 10 with the abutment 9 is pushed forward. The fingers 17 in the slide 5 are recessed under the influence of the slats 7, which are pressed by the springs 8. The springs 18 are compressed. After the part 23 is installed in the centers, under pressure from the rear center (not shown) the part is inserted into the cartridge. The stop 9 with the center 10 is recessed under the influence of the end face of the part 23. The spherical surface of the stop 9 acts on the bevel of the pushers 6, which are moved apart,. dragging the strips 7 behind you, which, in turn, compress the springs 8.

The movement of the part stops when the stop 9 with its spherical surface sits, self-adjusting, on the supporting surface of the faceplate 1. Then the spindle rotation (not shown) is turned on. The latch 20 under the action of centrifugal force diverges, dragging a fixed ·

19 4

21. The cams 12 release and the springs I8 act upon the fingers 17, in the slots of which the pins 16 fixed in the axis 13 are located, turn the cams 12 until they touch the part 23. Then the part 23 turns between the eccentric cams 12, its jamming is installed, and then it is set normal operation.

The unclamping of part 23 is carried out with the spindle stopped. Center 10 moves forward, bringing the part 23 to the cartridge. The stop 9, which follows along with the center 10, releases the pushers 6 with the bars 7 fixed in them. The pushers' 6 with the bars 7 under the action of the springs 8 move to the center of the cartridge by pressing the fingers 17 located in the sliders 5 and compress the springs 18. Fingers ^ act on the pins 16 which are in engagement with them, which are fixed in the end face of the axis 13. The axes 13 with the cams 12 fixed to them with the help of the keys 14 turn to become the initial position. Under the action of the spring-loaded fingers 22, the latches rotate, becoming their original position, and fasten the fasteners 21 into the grooves of the cams 12, thereby preserving them from premature rotation and clamping of the part to installing a new part and turning on the spindle rotation.

The proposed cartridge allows clamping stepped shafts with deviations of linear dimensions, increase the reliability of fixing and basing cams in the cartridge, thereby increasing the accuracy of machining.

Since the cam is placed in the slits of the slider, the dimensions of the cartridge are reduced. ’

ABOUT

Claims (2)

Claim · 1.'Automatic powered chuck, in the case of which eccentric self-tightening spring-loaded cams mounted in sliders are placed, the center with a spherical stop and a cam rotation drive, characterized in that, in order to expand technological capabilities, the cam rotation drive is made 916119 It is not in the form of pushers in contact with a spherical stop installed with the possibility of axial movement, and spring-loaded strips associated with the fingers, designed for ₅ interaction with the cams. 2. Cartridge on π. I, who I am, so that, in order to improve mounting accuracy, on the cams 6 made protrusions designed to accommodate them in the slots of the sliders.