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Method for controlling a drafting device of a spinning frame

A technology of drafting device and spinning frame, applied in the field of drafting device, can solve the problems of not considering the influence of spinning, uneven yarn and the like

Active Publication Date: 2018-03-30
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect on the spun yarn caused by the change is not considered
This leads to the occurrence of yarn unevenness

Method used

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  • Method for controlling a drafting device of a spinning frame
  • Method for controlling a drafting device of a spinning frame
  • Method for controlling a drafting device of a spinning frame

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0022] The ring spinning machine will now be used as an example to refer to Figures 1 to 3 A first embodiment of the present invention is described.

[0023] figure 1 One of two drafting devices 11 is shown, which are located at both sides of the spinning frame and extend in the longitudinal direction of the spinning frame. The drafting device 11 has a three-wire structure, which includes two front bottom rollers 12 , two middle bottom rollers 13 and two rear bottom rollers 14 . Each of the front bottom rollers 12 is supported by a roller frame (not shown) at a predetermined position. Each of the middle bottom rollers 13 and each of the rear bottom rollers 14 are supported by support brackets (not shown). The support bracket is fixed to the roller frame so that the position of the support bracket can be adjusted in the front and rear directions. Each middle bottom roller 13 includes an apron (not shown). Furthermore, the drafting device 11 includes front top rollers (no...

no. 2 example

[0047] will now refer to Figure 4 and 5 A second embodiment is described. The second embodiment differs from the first embodiment in that the untwisting draft ratio of the drafting device is varied during the standstill of the spinning frame so that the speed of the rear bottom roller 14 is lower than that obtained for normal operation of the spinning frame. Speed ​​of untwisting draft ratio. Similar or identical reference numerals are given to those components that are similar or identical to those of the first embodiment, and detailed explanation is omitted.

[0048] During stoppage of the spinning machine, after a predetermined time elapses from when the stop signal is received, the controller 18 changes the deceleration rate of the rear bottom roller 14 so that the untwisting draft ratio is increased from the initial BD ratio to the tentative ratio. BD ratio. Therefore, the untwisting draft ratio gradually increases during the stoppage process of the spinning frame, a...

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PUM

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Abstract

In a method for controlling a drafting device of a spinning frame, the drafting device includes a front bottom roller 12, a middle bottom roller 13, a back bottom roller 14, and motors (15, 16a, 16b, 17a, 17b) that independently drive the bottom rollers. The method includes changing a break draft ratio of the drafting device in a deactivation process of the spinning frame so that a load torque of the drafting device is smaller than when the break draft ratio is set to a value for normal operation to limit untwisting of the bottom rollers. The method further includes changing a main draft ratio when a fiber bundle, which has passed by the middle bottom roller 13 during a period the break draft ratio is changed, passes by the front bottom roller 12, to cancel influence on the fiber bundle of the changing in the break draft ratio.

Description

technical field [0001] The invention relates to a method for controlling a drafting device of a spinning frame. Background technique [0002] Spinning frames such as ring spinning frames and roving frames comprise spindles arranged in the longitudinal direction of the spinning frame, and drafting devices. The drafting device drives the bottom rollers at one end (gear end) of the spinning frame. The bottom roller is extremely long. Therefore, when the frame is activated and twisting occurs in each bottom roller, the twist is delayed in passing from the gear end to the opposite end (outer end) of the bottom roller. The twisted thread is particularly large in the bottom apron roller (middle bottom roller) around which the apron for the individual spindles is wound. Therefore, in a portion where twisting occurs, delayed twisting may cause yarn unevenness and yarn breakage. In addition to delayed twisting that occurs when the spinning frame is started, yarn irregularities can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01H5/22
CPCD01H5/36D01H1/22
Inventor 槌田大辅林久秋小岛直树
Owner TOYOTA IND CORP