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Drawing gripper for weaving looms with improved performance for the transport of double weft yarns

A technology for connecting weft swords and rapier heads, which is applied in the field of weft connecting rapier heads, and can solve problems such as uneven weaving

Inactive Publication Date: 2007-07-04
PROMATECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, it is common for the clamping device of the rapier head to only stably tension the weft yarn with a higher count, while the finer weft yarn is not suitable for holding, so that the tension applied to the two weft yarns is different , resulting in uneven weaving due to partial mutual sliding of two weft threads or even due to a complete break in either of these two weft threads

Method used

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  • Drawing gripper for weaving looms with improved performance for the transport of double weft yarns
  • Drawing gripper for weaving looms with improved performance for the transport of double weft yarns
  • Drawing gripper for weaving looms with improved performance for the transport of double weft yarns

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0014] The weft-joining rapier head according to the invention comprises, in a manner known to those skilled in the art, a rapier head body 1 terminating in a tip 2 at the front. Immediately behind the rapier head tip 2, a hook member 3 is integrally connected to the rapier head body 1, the hook member 3 having a planar gripping surface 4 facing the inside of the rapier head. In the embodiment shown, the surface 4 lies on a plane which is substantially vertical and which is suitably inclined relative to the longitudinal axis of the rapier head, for example at an angle of inclination between 15° and 30°.

[0015] In known types of weft receiving rapier heads, the inner surface 4 of the hook 3 is one of two elements of the weft thread clamping device, the other comprising a movable clamping surface 6 equipped with facing the hook 3 and The wedge 5 rests on the opposite face on the body 1 of the rapier head. The wedge 5 is supported on the front end of a rod 7 movable longitudin...

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PUM

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Abstract

Drawing gripper for weaving looms comprising a gripping device of the weft thread consisting of the coupling between a fixed surface formed in the inner part of the gripper hook and inclined with respect to the shifting direction of the gripper, and the mobile surface of a wedge carried on the front end of a longitudinal rod housed in the gripper and movable in an axial direction with respect thereto. The movable rod is driven in an open position of the gripping device, in contrast with spring means provided on the gripper, by lever means cooperating with fixed outer abutments arranged on the loom, and on the same rod the rear portion of a flexible metal plate is attached, the free front portion whereof imparts an elastic pressure force to the upper edge of at least one of the cooperating surfaces of said gripping device.

Description

technical field [0001] The present invention relates to a drawing gripper for a weaving machine, in particular for achieving a stable gripping of a double weft thread comprising two separate weft threads, the two weft threads Associated and simultaneously introduced into the shed formed by warp yarns to make specific fabrics. Background technique [0002] In rapier looms, it is already known that the delivery of the weft yarn through the shed is effected by a pair of cooperating rapier heads, called the weft sending rapier head and the weft receiving rapier head respectively. Rapier heads, which are controlled in alternating motion through the shed. More precisely, the passage of the weft feeding rapier head is open between the weft thread entry side and the middle of the shed, and correspondingly the passage of the weft receiving rapier head is open between the weft thread exit side and the middle of the shed. [0003] So in the middle of the shed, the weft exchange takes...

Claims

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Application Information

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IPC IPC(8): D03D47/20
CPCD03D47/23
Inventor R·莱博洛S·泰斯塔
Owner PROMATECH
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