SU1428884A1 - Ratchet-and-pawl mechanism - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in devices for converting reciprocating motion of a stick into intermittent rotary motion of an actuator. The purpose of the invention is to increase reliability and productivity by providing an unaccented fixation of the ratchet wheel and reduction of the working cycle time by eliminating braking of the ratchet wheel at the end of the working stroke. The purpose of the invention is achieved by the fact that at a uniform speed of movement 3 the ratchet wheel 1 with table 9 under the action of the pawl 7 moves with a variable speed varying from zero to the maximum value, and then their speed again slows down and reaches zero in position indicated in FIG. dotted line. Such a characteristic of the speed of rotation of the ratchet wheel 1 and the table 9 provides the minimum time for their rotation and eliminates the need for their braking. Ensuring at the end of the rotation of the table 9 speed equal to zero, makes it stop smooth and unstressed, which increases the reliability of the mechanism. 2 Il. with (L with

Description

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The invention relates to mechanical engineering and can be used in devices for converting the reciprocating motion of a drive into an intermittent rotary motion of an actuator.

The goal of the prevention is to increase reliability and productivity by ensuring that the unmounted storage of the storage wheel is reduced and the working cycle time is reduced by eliminating the ratchet wheel at the end of the working stroke.

; FIG. 1 shows a ratchet mechanism, a general view; in fig. 2 times A-A in FIG. one.

: The ratchet mechanism contains the ratchet wheel 1, the power cylinder 2 with. a rod 3, a leash 4 with a longitudinal groove 5, mounted coaxially with a ratchet-jIy wheel 1. On a leash 4 on the axle 6, a pawl 7 with a spring 8 is fixed. The table 9 is mounted coaxially with the ratchet wheel 1 and rigidly attached to it at the end of the driver 4, the crackers 10 are mounted with trapezoid grooves 11. In addition, the mechanism includes a lever 12, one end of which is pivotally mounted on the axis 13 in the housing 14, and the second end has a pin 15 which is pivotally connected to the rod 3 the cylinder 2 and on which the holder 16 is mounted movably, moving along the longitudinal 5 mu groove 4 leash.

Hoap mechanism works as follows.

When the stem 3 of the power cylinder 2 rotates, the pawl 7, pressing the ratchet wheel 1 to the spring 8, rotates the ratchet wheel 1, while the ferrule 16 mounted on the finger 15 moves along the groove 5 of the driver 4, and the lever 12 with the ferrule 16 makes the rotational movement around the axis 13. Simultaneously with the ratchet wheel 1, the leash 4 rotates until the end of the leash 4 stops against the biscuit. 10 (figure 2 is shown by a dotted line). In this prem lever 12 is moved to the extreme position, and the holder 16, moving along the groove 5 of the leash 4, partially comes out of the groove 5 of the leash 4 and enters the groove 11 of the cracker 10. A smooth stopping of the table 9 will occur and it will be securely fixed.

When the rod 3 of the cylinder 2 returns to its initial position, the leash 4 is retracted with the pawl 7 and the table 9 is released. After that, the cylinder 2 makes a working stroke again, the cycle repeats.

Claims (1)

Invention Formula A ratchet mechanism containing a ratchet wheel, a leash with a pawl, a power cylinder with a rod, a finger connecting the cylinder rod with the leash, and a ratchet wheel retainer with breadcrumbs, characterized in that, in order to improve reliability and performance, the leash is suspended a longitudinal groove in which the stem finger is installed with the possibility of interaction with the crackers, the retainer is made in the form of a lever connected with the finger, and the crackers are placed evenly around the circumference of the ratchet wheel.