Textiles: spinning – twisting – and twining – Apparatus and processes – Threading up
Reexamination Certificate
2000-02-28
2001-04-03
Vanatta, Amy B. (Department: 3741)
Textiles: spinning, twisting, and twining
Apparatus and processes
Threading up
C057S332000
Reexamination Certificate
active
06209301
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a false twist texturing machine for texturing a plurality of advancing thermoplastic yarns.
The known texturing machine comprises a creel frame and a winding frame. In the creel frame several feed bobbins are arranged above one another which each make available a thread for a processing-point. Above the creel frame a first delivery mechanism is arranged, in order to draw off the thread from the feed bobbin and to convey it into a false-twist texturing zone. In the false-twist texturing zone an elongated heating device and an elongated cooling device are arranged in alignment in series above the frame. By virtue of this arrangement, extreme deflections result in the line of thread between the feed bobbin and the inlet of the heater, which make careful processing of the yarn impossible. Furthermore, the arrangement of the delivery mechanism above the creel frame results in operating problems, particularly in the process of piecing the thread.
An object of the invention is consequently to design a texturing machine of the type specified in the introduction in such a way that careful processing of the yarn and therefore higher texturing speeds can be achieved.
A further objective of the invention is to create a texturing machine with which the thread can be pieced in simple manner also in the case of a multi-tier construction of the machine.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by a yarn false twist texturing machine which comprises a frame assembly which mounts a feed bobbin, a first yarn delivery mechanism, an elongate first heater, an elongate cooling device, a false twist unit, a second delivery device, and a wind up device. The first heater and the cooling device are positioned at an elevated location, preferably above the frame assembly, and the first delivery mechanism is mounted for generally vertical movement between a raised operational position directly upstream of the first heater, and a lowered operating or thread up position. A drive is provided for rotatably driving the first delivery mechanism is the raised position, and the drive is disconnected when it is in the lowered operating position.
The texturing machine according to the invention is distinguished, first of all, by the fact that the delivery mechanism is arranged directly upstream of the inlet of the first heater. By this means a deflection-free line of thread between the delivery mechanism and the heater is brought about. The tensile force of the thread that is set with a view to stretching within the false-twist zone between the first delivery mechanism and the second delivery mechanism can be set without significant friction losses. The particular advantage of the texturing machine according to the invention, however, is that, with a view to piecing the thread, the delivery mechanism is capable of being vertically adjusted into an operating position below the operational position, in which operating position the delivery mechanism is not driven. In the process of piecing the thread, the thread coming from the feed bobbin is guided by the operator with a suction pistol. In the operating position the operator consequently brings the thread up close to the delivery mechanism with the aid of a suction pistol. The speed of the line of thread is determined by the suction pistol. No conveying action takes place by means of the delivery mechanism, so no differences in speed can arise. In the operating position the thread glides over the conveying means of the delivery mechanism. Rolls or rollers may be employed by way of conveying means in this connection. If, for example, pressure rollers or pressure belts are employed, the clamping between the pressure rollers or between the pressure belts and the roll is firstly set in the operational position, in order to enable the thread to glide. Activation of the delivery mechanism may, for example, be brought about in simple manner by means of a final-position circuit with the aid of a contact switch.
The vertical adjustment of the delivery mechanism may be effected in the case of the texturing machine according to the invention with or without the delivery mechanism being driven. In the case where the drive is capable of being moved jointly with the delivery mechanism out of the operational position into the operating position, the invention provides a solution with which the drive in the operational position is connected in coupling manner to a power-supply connector. Depending on the configuration of the drive, it is consequently possible for the power supply to be established by means of a mechanical coupling or an electrical plug contact as a result of connection between a power source and the drive.
In a particularly advantageous further development of the texturing machine according to the invention the delivery mechanism takes the form of a conveyor roller which is driven by an electric motor. The motor is connected in the operational position to an electrical power supply by means of a plug. By virtue of a design of this type it is possible for each processing-point to be operated individually. In particular in the process of piecing the thread, each processing-point can be operated independently of the adjacent processing-point.
In the case where the delivery mechanism takes the form of a conveyor roller the thread is guided on the periphery of the conveyor roller in a zigzag-shaped thread-line track. For this purpose the conveyor roller comprises a plurality of guide elements on the periphery which bring about a deflection of the thread substantially at right angles to the direction of the line of thread. In the event of rotation of the conveyor roller the thread is conveyed in non-slipping manner by reason of the friction between the guide elements and the thread. In addition to the deflection of the guide elements, the thread has to partially wrap around the conveyor roller to a certain extent. This partial wrapping is achieved in the operational position, so that in the operational position the drive of the conveyor roller has to apply a correspondingly high driving torque. With a view to accelerating the conveyor roller it is therefore particularly advantageous if the texturing machine comprises a power-supply connector with a mobile plug contact which, together with the corresponding plug, results in current being supplied to the motor a short time before the operational position is reached and hence brings about a start-up of the delivery mechanism a short time before the operational position is reached.
A particularly preferred construction of the texturing machine according to the invention provides for the drive to be arranged so as to be fixed in the operational position, while the delivery mechanism is able to be coupled to the drive or uncoupled from it in the operational position. This arrangement has the advantage that control of the drive is thereby possible independently of the location of the delivery mechanism.
The configuration of the delivery mechanism in the form of a conveyor roller is particularly advantageous also in the case of a fixed drive. The connection between the electric motor and the conveyor roller in this case is ensured in the operational position by means of a magnetic coupling. This magnetic coupling may consist, for example, of two magnetised discs which form an air gap between them. The magnetic discs possess alternating magnetic polarities in the peripheral direction, so that a rotary motion can be transmitted. These coupling discs are fastened frontally to the rotor of the motor and to a hub of the conveyor roller.
In a particularly advantageous design of the texturing machine the pick-out mark is placed directly in the driving magnetic field of the motor. To this end the rotor is constructed so as to be capable of being displaced out of the motor together with the conveyor roller. The linkage between rotor and stator is effected via magnetic forces. Hence a wear-free connection between t
Baader Uwe
Wortmann Thomas
Alston & Bird LLP
Barmag AG
Vanatta Amy B.
LandOfFree
Texturing machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Texturing machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Texturing machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2500808