Friday, February 19, 2021

Under-pick picking motion

 Under-pick picking motion:

Since the complete picking mechanism is mounted under the loom in this motion and the picking stick also hits the shuttle underside of the loom, so that this mechanism is called under pick motion.

Structure and working of under-pick motion:

The picking tappet is mounted on the bottom shaft of the loom. 

The picking tappet is fastened on the bottom shaft with the help of a clamp and bolts. Picking tappet timing can be changed by these bolts and clamp. The picking tappet nose is mounted on the picking tappet with the help of bolts. The height of picking a tappet nose gets adjustable. A side shaft is used in under pick motion. This shaft can rotate in both directions ( clockwise and anti-clockwise direction). The shaft is mounted on the brackets. A cone is mounted at one end of the side shaft. The other end of the side shaft is inclined at an almost 90-degree angle. This other end is connected to the picking stick with the help of a picking strap. The bottom end of the picking stick is pivoted. It is free to rotate in both directions. The top end of the picking stick is connected to the picker. 

When the crankshaft rotates, it also revolves around the bottom shaft. The same picking mechanism is fitted at both sides of the bottom shaft.  When the loom makes two revolutions, the crankshaft makes two revolutions and the bottom shelf makes one revolution only.

A picking tappet mounted on the bottom shaft gets rotated when the bottom shaft rotates. The picking tappet nose pushes cone mounted on the side shaft. Since the cone is mounted on the side shaft so that the side shaft is also rotated when the cone gets pushed downward.  The inclined end of the side shaft is connected with the middle part of the picking stick with the help of a picking strap. The side shaft makes partial angular motion.  When the side shaft rotates in an anti-clockwise direction, it pulls the picking stick forcefully. The picker attached on the top of the picking stick hits the shuttle. Thus shuttle travels from one shuttle box to another shuttle box. Now the pulling spring acts immediately and brings the mechanism in its previous position.

Please click on the below  video link to watch the full topic in Hindi:

You may also be interested in the following articles:

Let - off motion, secondary loom motion

Take - up motion, a secondary loom motion

Shedding motion, a primary loom motion

Picking motion, a primary loom motion

Beating motion, a primary loom motion

Schematic diagram of loom

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