SU1446397A1 - Ratchet-and-pawl mechanism with changeable travel - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in devices with adjustable law of periodic motion. The purpose of the invention is to expand the kinematic capabilities of the mechanism by providing control of periodic motion. The cam 15 presses the shutter 12, which, turning on the axis 14, will twist one of its teeth out of engagement with the toothed sector 9, and the other tooth inserts into the cavity. Under the action of the spring 8, the toothed sector 9, together with the flap 10 and the rocker 4, is rotated by an angle equal to half the pitch of the teeth of the toothed sector 9. 1 sludge.

Description

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The invention relates to mechanical engineering and can be used in devices with adjustable law of periodic motion.

The aim of the invention is to expand the kinematic capabilities of the mechanism by providing control of the Periodic motion,

The drawing shows a ratchet mecha with variable speed.

The ratchet mechanism contains a base 5 on which a ratchet wheel 2 and two rocker arms 3 and 4 are mounted on one Axis. The cylinder cylinder 5 is connected to the base 1 and the rocker 3 on which the working dog 7 is mounted on axis 6. On the rocker arm 4 connected With the base 1 spring 8, the toothed sector 9 and the flap 10 are rigidly fixed, the locking pawl 11 and the slam-shutter 12 are mounted on the base 1 respectively on axes 13 and 14, the locking pawl 11 is designed to interact with the ratchet wheel 2, and the slam-12 has a toothed gear sector 9 and cams isj fastening on the ratchet wheel 12 is spring-loaded stripper 2c to a toothed sector 9 6. Number of spring cams May 1 determines the nature of the ratchet wheel movement 2 within one revolution of the latter.

The mechanism works as follows.

Pr and compressed air into the working cavity of the pneumatic cylinder 5 of the rocker arm 3, together with the working dog 7 begins to rotate. At the same time, the working dog 7, having moved from the plate 10, on which it was before the start of the cycle, falls into the hollow of the ratchet wheel 2 and turns it at a certain angle in relation to the base 1, Fixing dog 11, turns on axis 13, slides along the tooth of the ratchet wheel 2 and when it stops falls into the cavity of the tooth. During the return stroke of the pneumatic cylinder 5, the cow drive 3 returns to its original position. Such cycles will continue until the cam 15 presses the slam-shut 12, which, turning on the axis, releases one of its teeth from the engagement with the toothed sector 9, and the other tooth inserts into the cavity.

Under the action of the spring 8, the toothed sector 9 together with the flap O and the yoke 4 will rotate by an angle corresponding to half the pitch of the teeth of the toothed sector 9. With further rotation, the cam 15 will come out of contact with the cutter 12, which, under the action of the spring 16, rotates will allow the toothed sector 9 with the flap 10 to rotate further by an angle corresponding to the half pitch of the teeth of the toothed sector 9. As a result of such movements of the flap 10 relative to the ratchet wheel 2, the working pawl 7 is following the next stroke of the pneumatic cylinder 5 This means a larger number of teeth, which means that the ratchet wheel 2 turns to a greater angle than in previous cycles.

Claims (1)

Invention Formula A variable-speed ratchet mechanism containing a base, a ratchet wheel mounted on it, two rocker arms located coaxially with the ratchet wheel rotatably around its axis, and a working and locking pawl, respectively located on one of the rocker arms and base, differing in that in order to expand the kinematic possibilities, it is equipped with a toothed sector fixed on another yoke and a guard designed to interact with the working dog, the cutter, pivotally mounted on the shaft Hovhan zhinennym subspace and the toothed sector, and a cam mounted on the end of the ratchet wheels and designed for periodic engagement with the blade.