Textiles: knitting – United needle machines – Straight
Patent
1996-07-24
1998-01-20
Calvert, John J.
Textiles: knitting
United needle machines
Straight
D04B 2726
Patent
active
057091080
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an auxiliary driving device and a control method for a patterning device in a warp knitting machine.
BACKGROUND ART
Heretofore, the patterning in a warp knitting machine has been effected by allowing a pattern guide bar having guide points mounted thereon to effect lapping movement in the direction of rows of knitting needles by means of pattern guide bar lapping means such as a chain drum or electronic patterning device or in the case of a float pattern guide bar for forming float patterns it is reciprocated with a fall plate attached thereto. However, since the amount of lapping obtainable is the same for all guide points mounted on a single row of pattern guide bars, the resulting patterning effect, which is influenced by the number of pattern guide bars, is nothing but one which is proportional to the number of pattern guide bars.
In view of the above problem, the present applicant previously proposed a new patterning device in Japanese Patent Application No. 6-200750. According to this device, the guide points and/or fall plate is installed as a portion of a movable body in a fixed guide path corresponding to a pattern guide and is adapted to move in said guide path. As an embodiment of such device, the guide path side is constructed as a stator for a linear motor, while movable body including the guide points and/or fall plate is constructed as a movable body for the linear motor.
Further, in the conventional warp knitting machine having fall plates, the so-called fall plate knitting is effected wherein float pattern yarns guided by a float pattern guide bar are moved in that the fall plate is actuated from the stitch forming position of knitting needles to a non-stitch forming position. In this connection it is to be noted that the fall plate has been formed of a single plate so as to act on the entire row of knitting needles.
In the aforesaid proposed patterning device, the movable body at least a portion of which forms a guide point is displaced for each knitting course by an amount corresponding to the knitting machine gauge on the basis of pulse signals from an electronic control section; thus, the movable body is required to have a higher followability as the rotation number of the knitting machine increases. However, during high speed movement of the knitting machine, the starting-up movement of the movable body inevitably tends to delay because of the characteristics of a linear motor, which delay forms a cause of obstructing an increase in the rotation number of the knitting machine.
Further, there has been the fear of causing serious damage to knitting components; if the front end of the guide point which integrally moves with displacement and stoppage of the movable body act at a position where it comes into contact or collide with the knitting needles owing to erroneous transmission of pulses, then, at the worst, for example, yarn or needle breakage occurs.
Further, in a warp knitting machine having the aforesaid latter fall plate, the fall plate is constructed to simultaneously acts over the entire knitting machine width. Therefore, even in the case of simultaneously knitting a plurality of fabrics, where there are a plurality of knitting widths, with the pattern arrangement differing for each width, such as one having a sink pattern alone or a partial float pattern, the fall plate acts for each course, with the result that the vibration of the knitting machine is accelerated while large-scale devices such as cams and levers are required.
An object of the present invention is to provide an auxiliary driving device which eliminates the drawbacks in said patterning device and which is capable of sufficiently following a high speed rotation, and control method which ensures reliable action taking place between knitting needles even at the time of displacement or stoppage of the movable body owing to erroneous transmission of pulses.
Another object of the invention is to provide a warp knitting machine which eliminates the drawbacks of a c
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patent: 3478543 (1969-11-01), Faninger
patent: 3678711 (1972-07-01), Schneider et al.
patent: 3729954 (1973-05-01), Ducol
patent: 3978690 (1976-09-01), Beling et al.
patent: 4051698 (1977-10-01), Leohnardt
patent: 5259216 (1993-11-01), Zorini
patent: 5327750 (1994-07-01), Speich
Ono Kotaro
Otobe Yoshinori
Calvert John J.
Nippon Mayer Co. Ltd.
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