Patterning unit of warp knitting machine and control method ther

Details Patterning unit of warp knitting machine and control method ther Patterning unit of warp knitting machine and control method ther

1996-11-06

1998-07-07

Calvert, John J.

Textiles: knitting

United needle machines

Straight

66207, D04B 2726

Patent

active

057751340

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a patterning unit of a warp knitting machine and more particularly to a patterning unit which controls the position of a guide point provided on a holding member individually by means of a linear pulse motor and to control methods thereof.
Hitherto, patterning of a warp knitting machine has been carried out by lapping patterning reeds in which guide points are mounted in a direction of row a needles of the patterning reed based on means for lapping the patterning reeds such as a chain drum and an electronic patterning unit. However, because only the same quantity of lapping can be obtained for all the guide points mounted on one patterning reed, the superiority of patterning effect caused by a number of patterning reeds is proportional to the number of patterning reeds.
In view of the prior art problem described above, the present applicant had proposed a new patterning unit previously in Japanese Patent Application No. 06-200750 (PCT/JP95/00032). This patterning unit has been arranged such that guide points are provided individually as part of moving elements in a fixed guide path which corresponds to the patterning reed so as to be movable individually within the guide path.
However, even though the above-mentioned patterning unit patterns through the control of the movement of the moving elements on which the guide points are provided by utilizing linear pulse motors, it has left room for improvement in the following points: with it by thinning the linear pulse motor further; by a large attraction force generated between a stator and a moving element of the linear pulse motor; to step-out power failure and external noise in the positioning control; elements, it is necessary to improve a wiring method for wiring connection cables to the moving elements to realize a range in which the moving elements can be moved freely. This is a problem in mounting to the warp knitting machine; elements, it is necessary to simplify the assembly and adjustment of the unit. This is a problem in mounting to the warp knitting machine; difference in working precision of pitches of poles of a stator assembled to the holding mer, in working precision of pitches of knitting needles and in expansion coefficient of the holding members due to environmental temperature changes; the holding members, are disposed, it is necessary to simplify the replacement of the guide point and its alignment with a knitting needle of each moving element which is located behind another; and control method is required which allows each moving element to be positioned at high-speed in synchronism with the rapid rotation of the warp knitting machine while maintaining the free movable range of each moving element and which can realize the above-mentioned points (3) through (7) at low cost.


SUMMARY OF THE PRESENT INVENTION

Accordingly, it is an object of the present invention to provide a patterning unit of a warp knitting machine and control methods thereof which are arranged so as to solve each of the problems described above.
The present invention is arranged such that in a patterning unit of a warp knitting machine in which a stator of a linear pulse motor is assembled in a holding member functioning as a guide path and a plurality of moving elements are provided at arbitrary intervals on the same path, part of the moving element is constructed as a guide point or a guide bar, and poles of the moving element are disposed so as to face to poles on both sides of the stator.
Thereby, attraction suction forces generated between the stator and the moving element cancel each other and the burden placed on a bearing section is reduced as a result. Therefore, the thickness of the poles of the moving element may be reduced to about a half without dropping a thrust of the moving element. Accordingly, an increased number of the holding members is made possible by thinning the linear pulse motor.
The present invention is also arranged such that in the patterning unit described above, coils of the p

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patent: 5311752 (1994-05-01), Gille
patent: 5331828 (1994-07-01), Weis et al.
patent: 5353611 (1994-10-01), Wade et al.
patent: 5390513 (1995-02-01), Hagel et al.
patent: 5473913 (1995-12-01), Bogucki-Land
patent: 5553470 (1996-09-01), Hohne et al.

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