US 5,855,126 AGranted

Patterning unit of warp knitting machine and control method thereof

AssigneeNippon Mayer Co., Ltd.

InventorsYoshinori Otobe, Yasumasa Narikiyo, Shigeo Yamagata, Norimasa Nosaka

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Abstract

The present invention provides a patterning unit of a warp knitting machine having a holding member with a stator of a linear pulse motor disposed thereon and a plurality of moving elements provided at arbitrary intervals on the holding member with parts of the moving elements being constructed as guide points. A control method increases reliability and accuracy of positioning the moving elements and eliminates erroneous operation such as step-out by providing a position sensor and by exciting movement of the moving elements on a step by step basis based upon positions of the moving elements sensed by the position sensor. The control method includes providing the moving elements each with a linear motor coil assembly for functioning in conjunction with the stator to move the moving elements along the holding member.

Claims21

Dependent claims

A method for controlling a patterning unit of a warp knitting machine, comprising the steps of:

providing a holding member which functions as a guide path and which has a linear pulse motor stator with poles disposed along said holding member, moving elements slidably mounted at intervals on said holding member, each of said moving elements having a guide member extending therefrom for guiding pattern yarns and a linear motor coil assembly functioning in conjunction with said linear motor stator to move said moving elements along said holding member;
detecting positions of said moving elements moving along said holding member;
and
controlling excitation of said linear motor coil assemblies of said moving elements such that for a given one of said moving elements, which is to be moved from a start position to a target position by a series of coil excitations, excitation of said linear motor coil assembly for said given one of said moving element is controlled based on a difference .DELTA.d between said position of said given one of said moving elements that is detected and an excitation target position for a coil excitation, wherein timing of said coil excitation is such that said coil excitation is executed when said difference .DELTA.d is within a predetermined limit for preventing step-out, and an excitation current of said coil excitation and said predetermined limit are based upon said position of said given one of said moving elements relative to said start position and said target position to effect acceleration and deceleration of said given one of said moving elements.

1 more element

A method for controlling a patterning unit of a warp knitting machine, comprising the steps of:

providing a holding member, as a guide path, having a linear pulse motor stator disposed along said holding member, moving elements slidably mounted at intervals on said holding member, each of said moving elements having a guide member extending therefrom for positioning pattern yarns and a linear motor coil assembly for functioning in conjunction with said linear motor stator to move said moving elements along said holding member;
providing position detecting means for detecting positions of said moving elements along said holding member;
and
controlling excitation of said linear motor coil assemblies of said moving elements to move said moving elements from respective start positions to respective target positions provided from patterning data including, for moving a least one of said moving elements from a respective one of said start positions to a respective one of said target positions, performing the steps of:
(a) detecting a position of said at least one of said moving elements;
(b) sending a coil excitation signal to said linear motor coil assembly of said at least one of said moving elements based on the detected position relative to said respective one of said start positions and said respective one of said target positions, to move said at least one of said moving elements for positioning at said respective one of said target positions;
(c) detecting a position of said at least one of said moving elements during movement of said at least one of said moving elements;
(d) determining whether said at least one of said moving elements has moved a requisite distance for sending a next coil excitation signal based on whether a difference .DELTA.d between the detected position of said at least one of said moving elements and an excitation target position for a next coil excitation signal is within a predetermined limit;
and
(e) repeating steps (b) through (d) when said at least one of said moving elements has moved said requisite distance and repeating steps (c) through (d) when said at least one of said moving elements has not moved said requisite distance until said at least one of said moving elements reaches said respective one of said target positions.

7 more elements

Dependencies are inferred from the claim text.