The grooved wheel, the noun of the workpiece, generally refers to the components of the grooved wheel mechanism, which together with the crank and the frame equipped with round pins form a stepping motion grooved wheel mechanism, which is mainly used in intermittent transmission.

A sheave is a wheel with a notch, but most of it is used to refer to the components of the sheave mechanism, the crank, and the frame equipped with round pins to form a stepping motion sheave mechanism, which is mainly used in intermittent transmission.

According to the position of the groove, the flat sheave can be divided into an outer sheave and an inner sheave.

Outer sheave: The radial opening of the sheave is outward from the center of the circle, and the driving part and the driven sheave turn in the opposite direction.

Inner sheave: The radial opening of the sheave is from the center of the circle to the inside, and the steering of the driving part is the same as that of the driven sheave.

The fewer the number of grooves of the outer sheave mechanism, the worse the power performance. The dynamic performance of the inner sheave mechanism is better than that of the outer sheave mechanism.

For example, for the outer sheave mechanism, if the driving dials with the round pin rotate continuously when the round pin has not yet entered the groove of the sheave (to avoid axial force, it is usually opened in the radial direction), due to the inner groove of the sheave The concave locking arc mn is blocked by the convex circular arc locking arc mn of the dial, so the sheave does not move. When the round pin enters the groove, the locking arc is just released, and the dial drives the sheave to rotate. When the round pin leaves the radial groove from the other side, the locking arc is blocked again, and the sheave stops moving until the next round pin enters the groove. In this way, the one-way intermittent rotary motion is output circularly.

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