Abstract: A flexible sheet turning arrangement located in a thread path upstream of the guides in a warp knitting machine that has a machine frame and at least one plurality of guides. The arrangement has a set of springs with proximal ends supported on the machine frame, and free distal ends. Also included is a turning element running the full width of the machine and attached to the free distal ends of the set of springs. The set of springs may include a package having at least two leaf springs placed on top of each other and joined at their ends. At least one of the springs may be made of a material having a greater internal coefficient of friction than steel. The springs may be laid to provide such a level of damping that the damping coefficient &dgr; satisfies a relationship involving Td the period of oscillation, and &ycirc ;i, &ycirc ;i+1 the neighboring amplitudes of damped oscillations.

Abstract: An electromagnetically-operating Jacquard control device has an electromagnet (1) with a magnetic core (3), an armature (8) and a limit stop (14) for each controlling element (16) to be controlled. The limit stop can optionally be brought into the movement path of a hook (18) attached to the controlling element (16). Two lovers (5, 11) are provided, the first bearing the armature (8) and the second bearing the limit stop (14). These two levers are coupled to one another with positive engagement such that the forces are transmitted substantially perpendicularly to the plane formed by the limit stop (14) and the swivel pin (12) of the second lever (11). This enables wear-related incorrect operation to be avoided.

Abstract: The arrangement can control the pulling tension of a thread 1 during its wind-off or wind-up, from or to a spool 3. The arrangement includes a thread brake 5 having a local portion 6 and a portion 8 movable relative thereto, between which the thread 1 is pulled during the wind-up or wind-off and which provides a frictional force upon thread 1. Furthermore, the arrangement includes an actuator 13 for applying a frictional force applied by thread brake 1 to thread 1 may be controlled. Preferably included is a piezoelectric sensor 14 which may be deformed by the force applied by the thread to the sensor 14. In the prior art, the actuator comprises a setting nut and a spring whose operation is time-consuming.

Abstract: In a method for manufacturing a warp knitted fabric, the guides can also be displaced by one needle space (pitch) in addition to the overlap and underlap shog of the guide bar, so that the guides are not only selectively displaceable during the underlap shog, but also selectively during the overlap shog. A warp knitting machine for the purpose of carrying out the method comprises at least one thread system which consists of pattern threads laid in intermixed, varying patterns. These pattern threads have underlaps of n, n+1 and n-1 needle spaces and can produce a float and/or a twill. The number of pattern possibilities can be increased in this manner.

Abstract: In a warp knitting machine at least one guide bar (8,9) carries piezoelectric bending transducers (14,15) to which are attached guides (11,12). A control arrangement (16) comprises a computer (17,19,20) and a potential generator, which provide the control potential via control lines (25) to the bending transducers. The potential source provided to a guide bar (8,9) comprises a plurality of serial to parallel converters (23) whose data and command inputs (22) are connected via a common data and command bus (21) with the computer and whose outputs (26) are connected with the bending transducers via the control lines (25). The serial to parallel converters (23) take up the data sequentially and upon occurrence of the switching command transmit them simultaneously in the form of control potentials. In this way rapidly running and/or large warp knitting machines can be provided with a operative piezoelectric jacquard control.

Abstract: A guide bar arrangement for a warp knitting machine has at least one guide bar, which is axially displaceable by means of a displacing arrangement and is carried, suitably on an axially rigid holding arrangement attached to a swinging shaft, through the intermediation of a compensating arrangement. The compensating arrangement and the displacement arrangement include bending transducers, which are attached at one end thereof on the holding arrangement (a lever 19 holding rails) and on the other end thereof on the guide bar and are bendably deformed under the influence of a direct current control signal. This leads to a simple construction of the guide bar arrangement with little frictional loss.

Abstract: In a warp-knitting machine with jacquard control, guide needles (1) are fastened to a guide bar (6) by means of carrier strips (3) which are bendable by at least one piezoelectric bending transducer. Each carrier strip (3) consists of electrically insulating material. The strip carries on at least one side, a layering consisting of (a) an inner electrode (8 to 11), (b) a piezoelectrically active layer (15, 17) covering the latter and (c) an outer electrode (16, 18). A control circuit (29) selectively supplies the inner electrode (8 to 11) with control voltage, while the outer electrode (16, 18) is connected to a reference potential. A contact-protected Jacquard control operated piezoelectrically is obtained in this way.

Abstract: There is provided an electromagnetically controllable coupling means between the drive shaft and a cam element of a textile machine. A latch mounted on the cam element and rotatable with it is biasable by a spring to interact with grooves in said drive shaft. Two rocker arms rotatable about fixed axes are each provided with a strikers and are swingable back and forth between a first position in which said striker holds the latch out of interaction with the grooves and a second position in which the latch is released in order to interact with said grooves. A pair of anchors influenced by program directed electromagnets serve to hold the said rocker arms in the first position. A stopping arrangement prevents further rotation of the cam means when the latch moves from one into the other of the aforementioned rotation positions. Each anchor attached to the appropriate arm is in the first position of the rocker arm presented proximate to the pole face of its appropriate electromagnet.

Abstract: In an electromagnetically operated, jacquard control arrangement, each controllable element is provided with an electromagnet cooperating with an anchor. An actuating current switch can energize the electromagnet arrangement. A swingably mounted control element provides a movable contact point on a lever arm for moving controllable elements. A swingable synchronization arrangement is driven back and forth by a continually rotating main shaft which can also turn the control element in one direction over a predetermined working angle. A return spring, in dependence upon the activation condition of the electromagnet, can swing back the control element. At the beginning of each working cycle the anchor is positioned proximate the poles of the electromagnet. The anchor is attached to the control element. The anchor of the control element may be carried by the synchronization arrangement.

Abstract: A steering system for controlling the operation of a warp knitting machine performing the function of a conventional jacquard mechanism includes an electromechanical mechanism to maintain the steering element in one of its two possible terminal positions. The system includes a steering mechanism disposed generally above and in relatively close proximity to the guidebar drive levers of the knitting machine and is operably coupled to a plurality of steering elements which are disposed proximate the guides of the machine. Activation of the electromechanical device coupled to a predetermined programming device causes the steering elements to be maintained in one of its two stable conditions which may be synchronized with the source of machine driving power.