Textiles: spinning – twisting – and twining – Apparatus and processes – Twist setting
Reexamination Certificate
2001-12-13
2004-05-18
Calvert, John J. (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Twist setting
Reexamination Certificate
active
06735934
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention concerns a method for the insertion and starting of thread in a false-twist texturing device, which device possesses a fluid containing heat exchanger with at least two passages for the leading through of thread and for the sealing of the heat exchanger. Moreover, the present invention relates to a false-twist texturing device with a heat exchanger having at least two thread passages for the conducting of the thread therethrough and for the sealing of the heat exchanger.
EP 0 624 208 B1 discloses a texturing device, in which heat exchangers are provided. The heat exchangers are installed for optional service as a heating apparatus or as a cooling apparatus. In each case fluid, hot or cold, is brought into contact with the thread. The fluid, in this operation, finds itself in a chamber through which fluid is continually flowing. The chamber is essentially constructed in tubular form and possesses small borings, through which the thread is brought into and out of the vessel. An exchange of heat is effected by means of the contact of the thread with the fluid. If the fluid is warmer than the thread, then the thread is warmed. If the fluid is cooler than the thread, the thread is cooled. Although this known apparatus operates satisfactorily, a disadvantage lies therein, in that in the case of a thread break, or if a restart of the texturing of the thread in the tubular vessel becomes necessary, then the thread must be reintroduced into the tubular vessel. This is very expensive in time and money, since, in order to restart the process, the thread must be inserted through very small openings in the tubular chamber. These starting operations in the case of this known apparatus is thus complicated and time consuming.
OBJECTS AND SUMMARY OF THE INVENTION
Thus, a principle object of the present invention is to create a process and an apparatus, wherein the insertion and the starting, that is, the restart of the texturing process, can be carried out quickly, simply and reliably. Additional objects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.
This above described object is achieved by a method in accord with the generic method, in which the thread passages are increased in size for the introduction of the thread. By means of the increased size of the thread passages, it becomes possible in a simple manner to insert the thread into the heat exchanger. The danger of a blockage of the thread passages is assuredly avoided with this arrangement. If, in an advantageous formulation of the invention, the thread passages are separable in an axial and/or radial direction for the introduction of the thread, and are thereupon closed following the introduction of thread, an especially simple and problem-free entry of the thread becomes possible. Where this procedure is concerned, the narrowly confined thread passages are opened, and thus, in a very simple manner, it becomes possible to lay the theread in an opened groove instead inserting it into a restricted, small opening. The thread, so inserted, by the subsequent closure of the thread passages, is once again totally enclosed in the passages, since the once exposed groove becomes a fully circumferentially enclosed passage upon being closed. The insertion of the thread by this method is very rapid, simple and reliable to carry out.
An object of the invention is further achieved, in that the thread, by means of an auxiliary air flow through the thread passages, is either blown or sucked through the thread passages.
By means of a corresponding arrangement of air nozzles, which empower the auxiliary air flow through the thread passages, the thread is entrained in the air flow and carried through the thread openings. In this case, obviously, an opening of the thread passages is not required and the entry and subsequent thread-start is thus activated by an especially simple, constructive apparatus. The auxiliary nozzles can be placed at each thread passage and thus act in the manner of a progressive nozzle arrangement, whereby the thread is carried along from nozzle to nozzle.
Further, the purpose of the invention will be achieved, in that the thread is pulled through the thread passages by means of an awl. In many cases of insertion in which the auxiliary air flow might not be sufficient, by means of an awl, which has been previously pushed through the thread passage, the thread can be captured thereon and then pulled through the thread passage. In many applications, this can be an advantage, since a mechanical guidance is available for the thread and the insertion is clearly made easier thereby.
In order to prevent the fluid of the heat exchanger escaping from the heat exchanger through the thread passages, in accord with the invention, a second fluid flow, in particular an air flow, restrains the first fluid from access to the thread passages. This second fluid flow, specifically an air flow, enters the heat exchanger in the area of the thread passages and accordingly generates a flow, that is, a pressure, which acts contrary to the escape tendency of the first fluid. In this way, an active sealing off of the thread passages is accomplished, so that the heat exchanger can even be so constructed, that the thread passages are placed in a vertical direction.
In order to prevent the first fluid from running out of the heat exchanger upon the insertion of the thread, provisions are made that, before the insertion of the thread (i.e., before the opening of the heat exchanger), the feed of the first fluid and/or the second fluid is interrupted and the fluid in the heat exchanger is removed. By this means, a simple insertion, or a guiding of the thread into the heat exchanger now empty of fluid, is possible. Thus, simple methods of insertion of thread now encompass both the use of an auxiliary flow of air as well as the opening of the heat exchanger.
To allow the thread to pass through the heat exchanger in a manner as free as possible from stress and thereby to avoid a thread break, provisions are made so that the thread travels only at a restrained speed after the inlay or insertion of the thread and then is increased to the operational level. In this way, the force, which the fluid exerts on the thread, is gradually increased so that a thread break is avoided.
The object will also be achieved by a false twist texturing device with a heat exchanger with at least two thread passages for the passage of the thread and for the sealing of the heat exchanger. In this case, the heat exchanger is separated along the direction of the thread movement, and the parts which allow the simple inlay of the thread can be parted one from the other. With an apparatus of this description, it is possible to open the heat exchanger so far that the thread can be inserted into the heat exchanger. The thread passages are made simple to access by the opening of the heat exchanger, so that the thread, in accord with the formation of the thread passage can be guided into the thread passages or laid across them with simple means. Following this inlay or insertion of the thread into the thread passages, the heat exchanger can be again closed, whereupon it is ready for operation. The complicated threading of the thread through the complete heat exchanger from the thread inlet to the thread outlet, as is necessary in the state of the technology today, is advantageously no longer required because of the invented method.
In the case of a separable heat exchanger, as well as where a single piece heat exchanger is concerned, provisions can be made for an injector nozzle to be placed before and/or after the individual thread passages at the respective inlet and/or outlet to transport the thread through the thread passage. The injector nozzle produces such an effect, that according to the passage design, the thread is guided through the thread passages by means of either a blowing or a suction action. The inje
Räder Wolfgang
Scherpf Hans-Dieter
Schmidt Klaus
Wabra Günter
Calvert John J.
Dority & Manning P.A.
Hurley Shaun R
TEMCO Textilmaschinenkomponenten GmbH
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