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A method and a device for opening and subsequently closing a weft brake in a thread feeder

A technology of brakes and feeding devices, applied in transportation and packaging, program control in sequence/logic controllers, weft knitting, etc.

Active Publication Date: 2013-05-08
L G L ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some applications, however, it is important that the slider return to the braked position immediately from the position it was in when the brake was released, to avoid several problems during the transition interval before optimum tension adjustment is obtained: These problems arise from the formation of defects in the actual manufactured item (clothes, socks, etc.) due to sudden stop of the spinning machine

Method used

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  • A method and a device for opening and subsequently closing a weft brake in a thread feeder
  • A method and a device for opening and subsequently closing a weft brake in a thread feeder
  • A method and a device for opening and subsequently closing a weft brake in a thread feeder

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Embodiment Construction

[0018] see figure 1 , such as the drum 10 of the yarn feeding device disclosed in the above-mentioned EP707102 is carried on a stationary support 12 on which a stepper motor 14 is also mounted; A slider 20 is driven, which is slidably mounted on the stationary support 12 , so that it will move in a direction parallel to the axis of the drum 10 . The limit stopper 22 limits the travel of the slider in the direction away from the drum.

[0019] The slider 20 has a ring 23 coaxial with the drum 10 , wherein a frusto-conical detent member 26 is elastically mounted by means of a radial spring 24 at a position in front of the drum 10 and coaxial with the drum 10 . The braking member 26 is known per se and is adapted to cooperate with the drum by contacting the rounded leading edge of the drum, so that the braking action is exerted on the yarn 28 which is unwound from the drum and which passes along the tension detector 30 while moving towards a textile machine (not shown).

[002...

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Abstract

The invention relates to a method and a device for opening and subsequently closing a weft brake in a thread feeder. A step motor (14) of the brake (20, 23, 24, 26) of the thread feeder, upon opening command ( to ), is driven in the direction of opening the brake, while counting the steps made by the motor until the brake is stopped by abutment against a travel stop (22), and storing the step count reached at the time of blockage ( step _ to _ open ). Upon a subsequent closing command (t 3 ), the step motor is driven in a direction of closing the brake by a number of steps equal to the stored count.

Description

technical field [0001] The invention relates to a method for opening and subsequently closing an electrical weft thread brake in a yarn feeding device of a textile or knitting machine, and to a yarn feeding device suitable for carrying out the method. Background technique [0002] In the technical field of textile machines, and more precisely in the field of yarn feeding devices, there are known braking systems in which a frustoconical braking member is elastically supported in an axial position in a cylinder feeder, The drum feeder is thus pressed by the motor with greater or lesser pressure, thereby adjusting the braking action so that the average tension on the yarn measured by a suitable downstream sensor corresponds to the expected tension. Such a system is disclosed, for example, in the prior document EP707102. [0003] In the regulation system described above, for control purposes, it is not necessary to know the absolute position of the motor (i.e. the slider that d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/04
CPCB65H2701/31D03D47/366B65H59/10B65H59/22D03D47/347D04B15/482
Inventor L·格蒂
Owner L G L ELECTRONICS
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