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Abstract

Knitted textile fabrics are usually produced on weft knitting machines. The basic mechanism of the machines to convert textile yarn into knitted fabric is called a latch needle cam system. A rigid-body model with five bodies is set up to analyse the motion of the needle of the latch needle cam system. The force element is modelled as a spring damper element between the needle butt and each virtual body on the cam curves. The spring constant is obtained from the cam angle, the friction coefficient and the stiffness of the needle. Numerical examples are given to show the path of the needle butt and the forces between the needle and the cams. For various rotational speeds of the cylinder, the maximum vertical and horizontal forces are obtained.

Keywords

latch needle weft knitting machine finite element analysis cam curve multibody dynamics impact force

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References

Spencer

D. J.

Knitting Technology, 1983 (Pergamon Press, Oxford).

Knapton

J. J. F.

The dynamics of weft-knitting: A mathematical analysis. Textile Res. J., 1966, 36 (8), 706–714.

Wray

G. R.

Burns

N. D.

Dynamic forces in weft-knitting: Parts 1, 2 and 3. J. Textile Inst., 1976, 67 (5), 149–165.

Wray

G. R.

Burns

N. D.

Cam-to-needle impact forces in weft-knitting: Parts I to IV. J. Textile Inst., 1976, 67 (6), 189–209.

Wray

G. R.

Burns

N. D.

Cam-to-needle impact forces in weft-knitting: Parts V to VIII. J. Textile Inst., 1978, 69 (8), 229–249.

Wray

G. R.

Burns

N. D.

Cam-to-needle impact forces in weft-knitting: Parts IX to XI. J. Textile Inst., 1978, 69 (10), 301–320.

Oldham

Burns

N. D.

Simms

G. J.

Non-linear cams for weft-knitting machines. J. Textile Inst., 1985, 76 (1), 30–37.

MacCarthy

B. L.

Sharp

J. M.

Burns

N. D.

An analysis of the mechanical forces in latch needle cam systems. Proc. Instn Mech. Engrs, Part C: J. Mechanical Engineering Science, 1992, 206 (C2), 129–137.

Pereira

M. S.

Nikravesh

Impact dynamics of multibody systems with frictional contact using joint coordinates and canonical equations of motion. Nonlinear Dynamics, 1996, 9 (1), 53–71.

10.

Wasfy

T. M.

Noor

A. K.

Computational procedure for simulating the contact/impact response in flexible multibody systems. Computer Meth. Appl. Mech. Engng, 1997, 147, 153–166.

11.

ADAMS/Solver Manual, 2000 (Mechanical Dynamics Inc.).

12.

Konke

ANSYS User's Manual, 1993 (Swanson Analysis Systems, Inc., Houston, Texas).

Dynamic modelling of the latch needle cam system of weft knitting machines

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References