Drafting device in spinning machine

Abstract

The drafting device in a spinning machine for spinning a single yarn while changing the mixing proportion of two kinds of roving is provided with: a middle bottom roller and a middle top roller; a back bottom roller and a back top roller; a middle apron pair to which the first roving is supplied, the middle apron pair having a middle bottom apron wound around the middle bottom roller and a middle top apron wound around the middle top roller and being driven by the middle bottom roller with the middle top apron pressed against the middle bottom apron; and a back apron pair to which the second roving is supplied, the back apron pair having a back bottom apron wound around the back bottom roller and a back top apron wound around the back top roller and being driven by the back bottom roller with the back top apron pressed against the back bottom apron.

Description

technical field [0001] The present invention relates to a drafting device of a spinning frame, and in particular to a drafting device of a spinning frame for spinning one yarn while changing the ratio of two types of rovings. Background technique [0002] In the past, as such a drafting device, such as Image 6 as well as Figure 7 As shown, Patent Document 1 proposes a device in which two rows of apron devices 62, 63 for supplying rovings 71, 72 are provided on the front roller 61, and the two apron devices 62, 63 are arbitrarily driven to switch the roving supply. Image 6 The apron device 62 on the left side is driven by the second roller 64. The apron device 63 on the right is driven by a third roller 65 behind the second roller 64 . In order not to drive the apron 66 of the apron device 63 by the second roller 64 , the diameter of the top roller above the second roller 64 is reduced so that the apron 66 avoids being pressed by the second roller 64 . The reason why the...

AI Technical Summary

Problems solved by technology

[0008] However, in the structure of the drafting device of Patent Document 1, in addition to the front roller 61, independent drafting rollers corresponding to the respective rovings 71 and 72 must be provided. The structure of the drafting device is complicated by adding two drafting rollers

[0009] In the structure of the drafting device of Patent Document 2, the middle top roller and the middle bottom roller are divided into left and right sides, and a drive source different from that of the normal middle bottom roller must be connected to one of the divided middle bottom rollers. The structure of the extension device is complicated

[0010] In the structure of the drafting device of Patent Document 3, although the structure is not complicated as in Patent Document 1 and Patent Document 2, the roving of one side supplied from the rear roller is arranged in front of the middle roller and the other side of the roving. The rovings are merged and the two types of rovings are held by the middle apron pair, so it is not possible to use only one roving supplied from the rear roller pair for spinning.

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