382results about "Tensioning devices" patented technology

A plurality of stitching machines and a control system used in stitching patterns into a plurality of items is capable of flexible control. The plurality of stitching machines may include one or more clusters of stitching machines, with each cluster able to stitch patterns into items independently of other clusters. Stitching machines within the plurality of stitching machines, or within the clusters of stitching machines, may be set to stitch patterns into items using one of a synchronized mode and an unsynchronized mode. When in the synchronized mode, the stitching machines perform stitching substantially synchronously with other stitching machines, and when in the unsynchronized mode the stitching machines perform stitching independently of the status of other stitching machines.

A sewing machine including a needle being supplied with an upper thread, a loop taker which accommodates a bobbin for a bottom thread, and a drive unit, which forces the needle to perform a reciprocating movement. The needle, during its movement and in cooperation with the loop taker, executes a stitch on a sewing material being advanced between the upper thread and the bottom thread. A take-up lever, for each stitch, pulls tight a knot being formed in the sewing material by the upper thread and the bottom thread in cooperation. The sewing machine further includes a thread transfer member supplying the needle with an upper thread with either a thread portioner or a friction braking assembly for friction braking of the upper thread. A switch switches between thread supply with the thread portioner or with the friction braking assembly. A control unit controls the thread supply from the thread portioner or, alternatively, controls the friction braking assembly.

The invention provides a tension disco control device in sewing machines and belongs to the field of mechanical technology. The invention resolves the following problems in tension disco control devices in prior sewing machines: Rather short service life, rather poor working stability and so on. The tension disco control device for sewing machines is arranged on one side of a tension disco; the tension disco comprises a bar body and an upper clamp disk, a lower clamp disk and a spring that are sleeved on the bar body; the control device also comprises a guide bar fixed in a casing and arranged in parallel with the bar body; the guide bar is connected with a push block that can slide vertically along the guide bar; the push block contacts with the upper clamp disk, so that the upper clamp disk can be tightly pressed on the lower clamp disk; the push block is connected with a power device I through a connection link mechanism I; besides, the casing inside is also linked to a rotation shaft; the rotation shaft is fixed with a handling part; the handling part contacts with the external end of a core bar; the handling part is connected with a power divice II through a connection link mechanism II. Due to the two power devices, the control device has advantages of rather long service life, high working stability and diversified operation and etc.