Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1992-11-12
1994-09-06
Falik, Andrew M.
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
242 4701, D03D 4734
Patent
active
053438990
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an arrangement for an easily movable output brake system for yarn in a yarn feeder (furnisher) which comprises a spatially fixed body which supports a yarn store and from which a yarn can be drawn off even at advanced speed through an output channel. The system comprises a first member which is arranged in a bearing and which, in the functional operation of the system, by means of a surface clamps the yarn being drawn off against a counterstay member.
BACKGROUND OF THE INVENTION
It is previously known to arrange controlled (alt. non-controlled) output yarn braking on yarn feeders. A known brake uses a spring member which is applied over the yarn path with one or more eye-shaped parts which can be tightened and slackened by means of the control member acting on the ends of the spring member. On tightening/slackening, the pressing against the yarn and the counterstay surface is modified (see e.g. U.S. Pat. No. 4,785,855, FIGS. 4-7).
It is also known to arrange individual spring members which are placed around the periphery of the yarn-storing part of the storing body of the yarn feeder. The spring members are in principle secured at their first ends and bear with their free ends against the yarn and press the latter against the underlying surface on the yarn-storing part of the storing body of the yarn feeder (see e.g. U.S. Pat. No. 4,785,855, FIGS. 2 and 3).
It is already known to control such spring elements in order to produce a yarn-braking function in which the spring elements press the yarn to a greater or lesser extent against a peripheral surface on the spool body of the yarn feeder.
It is thus previously known to provide brake arrangements which modify the yarn tensioning during the respective pick in the weaving machine. For example, in a projectile weaving machine, the yarn tensioning (brake effect) will be low or zero at the start of the drawing-off process as the projectile accelerates to its maximum speed. Thereafter, the yarn tensioning (brake effect) should be increased in the brake arrangement on account of the fact that the projectile slows down in its movement towards its other end position, and the yarn balloon formed on the bearing body on account of the drawing-off function would otherwise, as a result of the mass and movement of the yarn, "catch up with" the yarn part running out from the brake arrangement and would cause problems in respect of the brake arrangement. It is therefore desired to adapt the yarn drawing-off (yarn tensioning) to the movement of the projectile in the weaving process. A number of proposals for solving this problem are already known.
For example, in gripper machines, it is desirable to be able to produce a half-wave sinusoidal variation of the braking function/yarn-tensioning function. The first gripper draws out the yarn during an acceleration stage which is followed by a deceleration stage so that the yarn speed upon changeover to the subsequent gripper member is virtually zero. Such a variation also causes problems, since the accelerated yarn mass at the drawing-off point on the storing body must be prevented from pressing against the brake-effecting parts and causing disturbances (entangling tendencies).
It is known to use a controlled brake/tension-generating unit of the type which comprises two surface-supporting parts which can be placed opposite each other and which can be mutually influenced in directions towards and away from each other and between which a thread part running out from the thread store of the thread-storing member is passed during the thread drawing-off from the said member. The first surface-supporting part is positioned at or on the end surface of the thread-storing member, or alternatively consists of a part of the said end surface, and the second surface-supporting part is arranged on a unit situated outside the said end surface.
It is also known to arrange a non-controlled brake for thread-storing members, and the known brake is in this case of the type comprising two su
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patent: 4574847 (1986-03-01), Matsumoto
patent: 4744394 (1988-05-01), Lincke
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patent: 4799517 (1989-01-01), Bucher
Fredriksson Lars-Berno
Jacobsson Kurt A. G.
Falik Andrew M.
Iro AB
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