Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1990-09-14
1992-03-24
Falik, Andrew M.
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
D03D 4712, D03D 4727
Patent
active
050978730
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a gripper loom according to the preamble of the claim 1.
Gripper looms of the above-mentioned type are variously known. Thus, the EP-PS 0 126 497, for instance, describes such a gripper loom, in which the insertion band is in engagement with a drive wheel across a portion of its circumference, wherein at the start as well as at the end of the insertion one each block-shaped drive member holds the insertion band at the circumference of the drive wheel. The band end facing away from the gripper head is guided in a guide channel. It is very disadvantageous that the block-shaped guide members are subjected to considerable heating and great wear due to friction, which has detrimental consequences upon the work precision and the down times. The friction of the band end facing away from the gripper head in the guide channel also leads on the one hand to wear and, on the other hand, to a force exertion for pushing the insertion band into the guide channel, whereby the lifting of the insertion band off the circumference of the drive roller is promoted. Other guide members are also known. Thus, for instance, from EP 0 095 137, a guide band, which is arranged along the entire region of the engagement of the insertion band at the drive wheel and which presses the insertion band against the circumference of the drive wheel. This device is relatively complicated and requires a relatively high driving force because of the numerous guide and reversing rollers of the guide band.
Gripper looms are also known which operate with unperforated insertion bands. Thus such a gripper loom is known, for instance, from CH-PS 652,764 in which the band end facing away from the gripper end is rigidly connected with a drive wheel, wherein an unperforated insertion band is used, so that the force introduction occurs through the band end and the band can be wound in one single or several layers on the drive wheel. In order to prevent the lift-off of the insertion band from the drive wheel, which occurs as a consequence of the drive force introduced at the band end and/or as a consequence of centrifugal force, a complicated guide apparatus is provided containing a cable, whose both ends are fastened at the drive wheel and which is slung around the drive wheel in a multiple manner and is additionally guided by rollers arranged externally of the drive wheel. These rollers serve on the one hand for tightening or stretching the rope and, on the other hand, for reversing the rope from one guide region at the circumference of the drive wheel to the upper side of the insertion band wound around the drive wheel. This guide apparatus is extraordinarily complicated and requires additional drive forces in order to maintain the insertion band at the drive wheel and because of the circuitous guidance and reversal of the cable. An increase of the rpm, meaning of the output of the grippers, is therefore not possible. If the insertion band is wound up in two layers, it is additionally necessary that it contain spacer strips in order to insure intermediate space for the guide cable between the individual layers of the insertion band.
The rpms of these known looms are limited to 400 to 600 revolutions per minute because of these described problems.
It is the task of the invention to design a gripper loom of the type described above in such a way that an increase in rpm to, for example, 1,000 rpm, is possible and that herein a simple guidance of the insertion band is still provided, which is subject to only low wear and requires only low drive forces and which absorbs the centrifugal forces.
The thus defined task is solved by the invention by the characteristic features of claim 1. Because the insertion band is designed to be perforated and is driven by a toothed drive wheel in circumferential direction so that the force introduction is introduced essentially in the direction of motion of the gripper head and because the band end facing away from the gripper head is fastened at a rotary guide apparatus, the frictional forces requi
REFERENCES:
patent: 2641285 (1953-06-01), Flamand
patent: 3159184 (1964-12-01), Brown, Jr. et al.
patent: 3175587 (1965-03-01), Gove, Jr. et al.
Prestel, K.: Unter: Untersuchungen an Webmaschinen Deutsche Textiltechnik 17 (1967), vol. 5, p. 289.
Buhler Erich
Muller Jakob
Speich Francisco
Falik Andrew M.
Textilma AG
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