SU814583A1 - Three-jaw rake-type chuck - Google Patents

Description

The invention relates to the machining of materials, namely, devices for turning machines. A three-jawed rack cartridge is known, comprising a housing, a locking mechanism with a working element, cams with gear racks and gears which are kinematically interconnected and in contact with the gear racks (1. The disadvantage of this cartridge is not high enough reliability of operation, since when pressure drops in the pneumatic net, the part is unfastened in the machine cartridge when it is machined. The purpose of the invention is to improve the reliability of the cartridge operation. This goal is achieved by having one of the gear wheels There is a circular conical groove in contact with the working element of the locking mechanism, the conical groove being made at an angle of self-locking both in width and in depth. Figure 1 shows the cartridge, general view; figure 2 is view A in Fig. 1 ; Fig. 3 shows a section B-B in Fig. 1; Fig. 4 shows a section B-B in Fig. 3; Fig. 5 shows a development of a conical groove in Fig. 4, a section; Fig. 6 shows a section YYY in Fig. 3; Fig. 7 shows a section DD in Fig. 2. The cartridge consists of a body 1, cams 2, mounted on the guides of the rollers 3 and fixed to them with the help of bolts 4. Cams of ying toothed rack 5 which enter into engagement with gear wheels 6 and 7. The gear wheel 6 is planted on a shaft with a bevel gear 8, the incoming engages with the wheel 9 which is fixed a nut 10 and has a square socket 11 for the key. On one of the wheels 7 you-. A circular conical groove 12 is formed, extending and deepening along the circumference at an angle of self-braking. This conical groove includes a working element of the locking mechanism — a stopper 13, which interacts with the eccentric 14 through the cradle 15 and the spring 16. At the end of the eccentric axis, a square turn-key slot 17 is made to turn it the same size as the slot 11 on

The axle wheel 9. The axle of the ax and the 14 is fitted with a nut 18.

In place of the construction of the beginning and end of the circular crown slot 12, a step 19 is formed.

The operation of the proposed cartridge is carried out as follows. I -.

The key is inserted and rotated into the jacks. The wheels 9 and 8 are transmitted to the gear wheels 6 and 7, which move the cams 2 along with the guides of the rollers 3. Depending on the direction of rotation, the cams clamp the workpiece or unclamp it. During one revolution of the gears, the cams move by an amount equal to the circumference of the gears that engage with the rack, as the taper pair of wheels 8, 9 and gears 6 and 7 have a gear ratio.

When the cams move to the center, their course is limited by stopping each other, when moving from the center, by a stop 13, which from the initial position when turning the gear wheel 7 for a full turn, moving to the final position, abuts its conical end to the ledge 19. Moving the cams In this direction, a cpu can also be limited (ohm, which is filled on the last tooth of the slats (not shown in the Drawing).

After clamping the workpiece, locking the cams is achieved by inserting the conical part of the stopper 13 into the conical groove 12 of the gear.

Before the cam is retracted, when the workpiece is unfastened, the eccentric 14 rotates 180 °. When this spring 16

145834

B provides the gear wheel 7 free rotation in the opposite direction.

Fixing the rotation of the eccentric at an angle of 180 ° is carried out using a stop (not shown in the drawing). The withdrawal of the retainer from the conical groove when the cams are retracted from the part may also be provided with an additional spring (not shown).

Introduction to the design of the cartridge circular Q conical groove, made on one of the gears and in contact with the working element of the locking mechanism significantly increases the reliability of its work.

Claims (2)

1.Three-cam lath chuck, comprising a housing, a locking mechanism with a working element, cams with gear racks and gears, kinematically interconnected and in contact with gear racks, characterized in that, in order to increase reliability of operation, one of the gears is made circular conical groove in contact with the working element of the locking mechanism. 2. Patron pop. 1, characterized in that the conical groove is made at an angle of self-locking both in width and and in depth. Sources of information taken into account in the examination; 1. Seminsky, V.K., et al., Tools and Tools for Turning Works. Kiev, Technique, 1977, p. 5, fig. 1. A Figure 2 in-in If 15 / 7 nineteen FIG Fy