Textiles: knitting – United needle machines – Straight
Reexamination Certificate
2000-09-26
2001-07-03
Worrell, Danny (Department: 3741)
Textiles: knitting
United needle machines
Straight
C066S204000, C066S205000
Reexamination Certificate
active
06253583
ABSTRACT:
FIELD OF THE INVENTION
The invention is directed to a warp knitting machine with bearded needles and a pattern press comprising a driven press bar and individually steerable press elements thereon which, as desired during the working stroke of the press bar may either exercises press contact with the hooks of the appropriate bearded needles or not.
In the known warp knitting machines of this type (DE-PS 445 428) the press contact is achieved therein that a press bar carried by a lever is moved towards the bearded needles wherein a pin shaped press element carried by the press bar acts upon the hooks of the bearded needles. With the assistance of harness cords the pressing elements parallel to the needle shafts can be lifted so far that the bearded needles can freely move away.
In DE 44 18 714 (U.S. Pat. No. 5,533,366) there is provided a warp knitting machine having guide bars wherein the guides are provided with the free ends of a plurality of piezoelectric bending transducers, wherein one end of the bending transducers is affixed to the guide bar. By electrical control of the bending transducers, the guides are caused to take one of two positions determined by stops. This allows the patterning of the goods.
The task of the invention is to improve the patterning press of a warp knitting machine of the prior art.
The invention solves this problem wherein each pressing element is provided to a piezoelectric bending transducer attached to one end thereof, the free end of said transducers, in the direction of the needle bed is displaceable from a first position during the working stroke so that press contact occurs, and in a second position in the pressing element or a force transmitting element provided in series therewith in the direction of the needle bed, is deviated.
In the first position the working stroke of the pressing element is carried over to the hooks of the bearded needles, in the second position on the other hand because of the displacement, the press element for example, a force transmitting element in series therewith to and after provided force transmitting element moves sidewardly past the bearded needle. The return path of the free end of the bending transducer is exceedingly short. This allows for a high working speed since a piezoelectric bending transducer follows steering commands exceedingly rapidly. The complexity of construction is low. Bending transducers can be provided next to each other with very small separation so that it is possible to provide each bearded needles with its own bending transducer.
A particularly simple construction results from the piezoelectric bending transducers being attached to the press bar and carrying the pressing element at their free end.
A preferred alternate embodiment exists therein that the piezoelectric bending transducer is affixed to the press bar and its free end is coupled with a pressing element in the form of a lever wherein, the lever is carried by the press bar. By use of the lever the bending transducer is not subjected to the pressing force. Thus, it may be constructed in a weaker and thus narrower manner.
It is also desirable that the press element is in the form of a guided slider. The piezoelectric bending transducer is attached to the press bar and the free end thereof in the first position interacts with the slider and in the second position is displaced relative to the slider. The use of such slider permits the hooks of the bearded needles to be contacted very accurately.
In a similarly desirable alternative it is provided that the press element as a guided slider, the piezoelectric bending transducer is attached to a carrier affixed to the machine and its free end is provided with a protrusion which grips into a longitudinal groove of a lever born by the press bar and this, in the first position, interacts with the slider and in the second position is displaced with respect to the slider. Also in this modification the bending transducers are not subjected to the force of the pressing force. Since they are attached to a carrier rigidly attached to the machine, the electrical conduit lines do not create any problems. Since they are attached to a carrier attached to the machine, the electrical conduit lines do not exercise any bias during the working stroke. Preferably the pressing element is a sliding element guided in a longitudinal slot. These slots allow very accurate interaction with the bearded needles.
It is an equally desirable alternative to provide that the slider is swingable about an axis parallel about the needle bed.
It is also useful to provide the sliders with return stop onto which cams attached to the press bar can grip. These unidirectional acting return stops serve their function without influencing the switching action of the bending transducer.
It is also advantageous that the slider is covered with a friction resistant sliding coating. This supports the rapid to and fro movement of the slider.
It is advantageous to provide that the guides for several sliders are collected together in a single guide segment. Thus, repairs can be readily carried out by removal and replacement of such segments.
It is also desirable to provide a plurality of parallel piezoelectric bending transducers in a transducer segment which carries stops determining the first and second position of the free ends. These stops enable exceedingly accurate positioning.
It is further desirable that the pressing elements and/or the bending transducers are provided with polymeric caps. This reduces noise and abrasion.
It is further desirable to provide these polymeric caps with a side wall protruding beyond the front face. This side wall serves as a secure separation between neighboring pressing elements.
REFERENCES:
patent: 2266112 (1941-12-01), Wirth
patent: 2687027 (1954-08-01), Merkel
patent: 3466898 (1969-09-01), Kohl
patent: 5533366 (1996-07-01), Mista et al.
patent: 4418714 (1995-06-01), None
Brandl Klaus
Mista Kresimir
Behr Omri N.
Karl Mayer Textilmachinenfabrik GmbH
Worrell Danny
LandOfFree
Warp knitting machine with pattern does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Warp knitting machine with pattern, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Warp knitting machine with pattern will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2487654