Textiles: spinning – twisting – and twining – Apparatus and processes – Package handling
Reexamination Certificate
2001-10-22
2003-07-08
Welch, Gary L (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Package handling
C019S15900A, C019S127000
Reexamination Certificate
active
06588194
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a process as well as to an apparatus for the level adjustment of the can plate of a sliver can which is placed in a filling position at the output of a textile machine in order to be filled with a fiber sliver. The can plate is moved by a first moving device from a lower can plate position to a higher can plate position before the start of the filling process. The can is moved or can be moved into the lower can plate position during the filling of the can.
Such processes and devices are known in great numbers in the textile industry. In one widely used spinning can with a round cross-section, the lateral walls of the spinning can surround at least one helicoidal spring provided as a moving device pressing from below against the can plate. When the can is empty, the can plate is ideally lifted to the upper can edge. During the filling of the can with textile material, the can plate is gradually lowered through the weight of the filling material. In the same manner, spinning cans with rectangular cross-section are known, where usually two helicoidal springs are located next to each other in the longitudinal direction of the can. To stabilize the can plate in a horizontal position, a pantograph system or slidable lattice grate system is usually provided for these cans.
It is a disadvantage with these known devices that the splings in the spinning cans wear out in time, so that the can plate is no longer sufficiently lifted into its upper filling position when the can is empty. If the can is used at the output of a drafting arrangement, for example, the distance from the fiber sliver-feeding machine element to the can plate is too great. Consequently, the fiber sliver end is no longer deposited in an orderly manner but slips uncontrolled on the can plate. Tolerances in springs, including the material, length and constant elasticity, must be selected with relatively great precision in order to achieve a precise force effect upon the can plate for precise positioning at the upper can edge before the start of the filling process or similar consequences will occur.
In all of the above-mentioned cases, the fiber sliver deposited at the beginning of the filling process is of relatively low quality, as insufficient frictional engagement exists between the feeding machine element (in the case of a drafting arrangement this is a sliver channel in a rotary table) and the can plate. With the trend towards ever larger cans, above-mentioned difficulties intensify since a greater quantity of material of insufficient quality is filled into the sliver can at the beginning of the depositing process.
In order to avoid the above-mentioned effects as much as possible, the rotary table and the can are often accelerated at only a slow paced in the beginning of the depositing process. In that case, the productivity of the textile machine is lowered.
OBJECTS AND SUMMARY OF THE INVENTION
A principal object of the present invention is to further develop a process or an apparatus of the type mentioned above in such manner that the sliver quality of the sliver is improved in such manner that at the beginning of the filling process, i.e., during the running up of the textile machine, the sliver quality is improved independently of the state or position of the first moving device at the sliver can used. 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 principal object is attained in the process of the type mentioned initially in that the can plate is moved by a second moving device from the higher can plate position into an upper filling position before the start or in the starting phase of the filling process.
Furthermore, the object is attained with the apparatus of the type mentioned initially in that a second moving device is provided in order to move the can plate from the higher can plate position to an upper filling position as the can is in filling position, before or in the starting phase of the filling process.
The advantages of the invention are to be found especially in the fact that the can plate can be moved by means of the second moving device into an optimal position at the beginning of the depositing process. If cans with inserted springs are used as the first moving device, spring wear and a resulting undesirable low position of the can plate as well as deviations from spring tolerances can be compensated for. The frictional engagement between the fiber sliver deposited on the can plate and the rotary plate can be optimized by means of the invention at the beginning of the depositing process. Uncontrolled slipping of the fiber sliver is avoided, and thereby the quality of this fiber sliver segment is improved. Last but not least, the textile machine can therefore be switched over to its higher speed sooner, so that not only better sliver quality but also greater productivity is the result.
Generally, the invention can be used for all possible sliver can models, in particular, for round cans as well as for rectangular cans. The invention can also be used with different spinning machines with drafting equipment, e.g., draw frames and cards.
The overwhelming advantage of the process according to the invention consists in the fact that the can plate is lifted by means of the second moving device into the upper filling position. As mentioned before, this is useful in particular with worn-out springs, in order to achieve sufficient frictional engagement between can plate and the fiber sliver to be deposited. The invention can however also be advantageously used when the can plate is pushed out too far from the can due to excessively strong springs. In this case, the can plate can also be lowered to the optimal level according to the invention.
The invention can also be used for a textile machine where the can plate is raised and lowered by means of an external lifting device as the first moving device. In this case, the lifting device attaches for example at two projections at the front of the can plate that extend through the can wall. Alternatively, the can plate is lifted without contact by means of a force field. In these embodiments, the second moving device according to the invention can make it possible to achieve a fine-tuned positioning of the can plate.
The second moving device is designed preferably so as to be capable of traveling, in particular in a vertical direction. In this way, the second moving device can be brought to the position of the can plate into which the latter has been moved by the first moving device. Subsequently, the can plate can be moved into the upper filling position by actuating the second moving device. A horizontal traveling capability of the second moving device can also be advantageously used, e.g., in order to bring it laterally closer to the can or to the can plate. A combination of horizontal and vertical travel capability of the second moving device is also advantageous.
The additional force exerted by the second moving device is preferably of a magnetic, mechanical and/or pneumatic nature. A great number of variants are possible here in order to produce the additional force. It is advantageous if the moving device in question is designed so as to be space saving and efficient.
This positioning force preferably no longer takes any effect when a given quantity of fiber sliver has been deposited on the can plate and the can plate must therefore be moved out of the upper filling position. This requires that the positioning force be selected so as to be either constant and not too great, or that it may gradually decrease or increase as the degree of fullness of the can increases. This depends on the force ratios of all the forces acting upon the can plate and upon the fiber sliver deposited on it. After a certain distance covered by the can plate, the spring force alone assumes the moving of the can plate—where a sliver can equipped with springs
Ficker Frank
Kriegler Albert
Dority & Manning
Rieter Ingolstadt Spinnereimaschinenbau AG
Welch Gary L
LandOfFree
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