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US 4,223,703 AGranted
Picking mechanism for a shuttle of a weaving machine
AssigneeSulzer Brothers Limited
InventorErwin Pfarrwaller
Life of this patent
Estimating the term…
Abstract
A cam drive is used to control the picking movement of the picking lever. The cam drive includes a dam disc which has a recess (or projection) which causes the lever to accelerate at the beginning of a pick and thereafter imparts a prestress to the spring before the cam follower of the lever moves out of the cam disc recess. A dog clutch is used to permit movement of the cam disc relative to the uniformly rotating drive shaft.
Claims15
A picking mechanism for a shuttle of a weaving machine, said mechanism including
- a rocking lever;
- a picking element mounted on said lever for picking a shuttle;
- a spring connected to said lever to bias said lever in a picking direction;
- a rotatable drive shaft;
- a tensioning means for stressing said spring in a direction away from said picking direction, said means including at least one freely rotatable cam disc mounted on said shaft, a unilaterally acting clutch having a driving half mounted on said shaft for rotation therewith and a driven half secured to said cam disc, said halves being disposed in facing relation to each other, said cam disc having a series of cam sections in engagement with said rocking lever for accelerating the movement of said lever in said picking direction under the bias of said spring during rotation of said shaft while forming a clearance between said clutch halves and for subsequently partially stressing said spring for a subsequent pick;
- and
- a non-return means for preventing counter-rotation of said cam disc.
4 more elements
A picking mechanism comprising
- a picking lever having a picking element mounted thereon for picking a shuttle;
- a spring for biasing said lever in a picking direction;
- a rotatable drive shaft;
- a cam shaft freely rotatably mounted on said shaft in engagement with said lever, said cam disc having a series of cam sections thereon for sequentially engaging said lever to initially prestress said spring, to then accelerate the movement of said lever in said picking direction, to then decelerate said lever while rotational energy is transmitted from said spring to said disc and to then partially prestress said spring;
- and
- a unilaterally acting clutch between said drive shaft and said cam disc for driving said cam disc off said drive shaft, said clutch being disengaged during acceleration of said lever in said picking direction.
3 more elements
A picking mechanism for a shuttle of a weaving machine, said mechanism including
- a rocking lever;
- a picking element mounted on said lever for picking a shuttle;
- a spring connected to said lever to bias said lever in a picking direction;
- a rotatable drive shaft;
- a tensioning means for stressing said spring in a direction away from said picking direction, said means including at least one freely rotatable cam disc mounted on said shaft, a unilaterally acting clutch having a driving half mounted on said shaft for rotation therewith and a driven half secured to said cam disc, said halves being disposed in facing relation to each other, said cam disc having a series of cam sections in engagement with said rocking lever for accelerating the movement of said lever in said picking direction under the bias of said spring during rotation of said shaft while forming a clearance between said clutch halves and for subsequently partially stressing said spring for a subsequent pick;
- and
- an arm secured to and projecting from said lever and a second cam disc fixedly mounted relative to the first cam disc, said second cam disc engaging said arm to hold said lever against said first cam disc.
4 more elements
A picking mechanism for a shuttle of a weaving machine, said mechanism including
- a rocking lever;
- a picking element mounted on said lever for picking a shuttle;
- a spring connected to said lever for picking a shuttle;
- a rotatable drive shaft;
- and
- a tensioning means for stressing said spring in a direction away from said picking direction, said means including at least one freely rotatable cam disc mounted on said shaft in engagement with said rocking lever, a unilaterally acting clutch having a driving half mounted on said shaft for rotation therewith and a driven half secured to said cam disc, said halves being disposed in facing relation to each other, said cam disc having a first cam section for accelerating the movement of said lever in said picking direction under the bias of said spring during rotation of said shaft, a second following cam section for decelerating said lever while rotational energy is transmitted from said spring to said disc and a clearance is formed between said clutch halves and a third following cam section for subsequently partially stressing said spring for a subsequent pick.
3 more elements
Dependencies are inferred from the claim text.