Textiles: fiber preparation – Assembling – Formed silvers
Reexamination Certificate
1999-07-28
2001-04-24
Calvert, John J. (Department: 3741)
Textiles: fiber preparation
Assembling
Formed silvers
C019S15900A, C198S345100, C198S345300
Reexamination Certificate
active
06219886
ABSTRACT:
BACKGROUND
The present invention concerns a process, as well as an apparatus, for drawing at least one continuously fed fiber band, and for storing the drawn fiber band in a can.
Customarily, for the carrying out of a can exchange, a draw frame is brought to a standstill and the can exchange is made (for example, Rieter Draw Frame RSB-D30). Only after the exchange has been completed, is the operation of the draw frame resumed. In this way, the cans, as a rule, on the feed side and the removal side, are exchanged.
A method is already known to carry out the can exchange “on the fly”, that is, without interruption of the operative process (DE OS 2 354 634). In this case, the fiber band, which issues from the machine during the time necessary for the can exchange, is received in a reception container, which is then emptied into the new empty can after the can exchange has been completed. The quantity of fiber band so received in the container during this interval, is relatively large, so that, with this in consideration, a relatively large quantity of fiber band falls in disorder into the empty can. This can lead to disturbances in the later course of the operation during continued work-up of the fiber band. Further, because of the linear design of the can exchanger, a great deal of space is required.
OBJECTS AND SUMMARY OF THE INVENTION
Thus a primary purpose of the present invention is to create a process and an apparatus, with which these disadvantages will be avoided. In doing this, the possibility will be brought about that first, the draw frame does not interrupt its operation during the can exchange, and second, no great length of fiber band must be accumulated to be placed in disorder in the new can to be filled. Furthermore, the apparatus is to be simple and compact in its design. 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.
The purposes will be achieved, in keeping with the invention, by a process for the drawing of at least one continuously fed, fiber band and for the storage of the drawn fiber band in a can, by which process a rotatable can exchanger turning about an axis, brings to be filled, an available, empty can held in a ready-state waiting position into a filling station underneath a turntable, whereupon, after the filling, the can is moved to a reject position, therein characterized, in that the can to be filled, which is found in the filling station is brought to the fiber band on its side proximal to the rotating axle of the can exchanger. Employing a can exchanger rotatable about an axis, the inventive selection of arranging the fiber band feeding station reaches a point wherein a very short fiber band length issues during the can exchange. This is done with non-interrupted drawing of the at least one fiber band and with an equally maintained tension at unchanged operational speed. This is principally due to the fact that after a cutoff of fiber band entering the filled can, without difficulty, a very short length of still issuing fiber band is transferred to the incoming empty can, so that no disordered fiber band is deposited into incoming empty can.
This process can be optimized by many features. The intermittently driven can exchanger is so adjusted to the rotation of the turntable, that the fiber band is deposited in the filled can left in the filling station as long as the can remains in the area of the turntable and then deposits the fiber band in a subsequent empty can as soon as that can reaches the area of the turntable. Also, the can to be brought to the filling station is moved in accord with a gradual acceleration, essentially from the time, at which the full can leaves the area of the turntable, until the time at which the can to be filled reaches the turntable at a then high velocity. During the can exchange, the spatial interval between the empty can to be brought to the filling station and the full can exiting the filling station is reduced. The empty can, in contrast to the specified path through the can exchange, is brought from the ready-state waiting position by a shortened path into the filling station. The empty can at least in a portion of its path between the ready-state position and the filling sation, is moved along a linear transport path. These features allow the band length to be very short that issues during the can exchange and that is not directly conducted into either the full can, which is leaving the filling station, nor into the can to be filled, which is now entering the filling station. In the meantime, the draw frame continues operation.
For carrying out the invented process, an apparatus is provided for drawing at least one continuously fed fiber band and for the laying of the drawn fiber band in a round can, with a turntable for the equal distribution of the drawn fiber band in a can, with a can exchanger turnable around a rotating axle, controlled by a control apparatus, with the aid of which one available empty can in a ready-state position is brought into a filling station for filling underneath the turntable. After the filling, the can is moved to a reject position, for the execution of the process of the can exchange. The spatial interval axis of rotation of the turntable, from the axis of rotation of the can exchanger is at a maximum just so large as the spatial interval of the center point of the can which is found in the area of the turntable from the axis of rotation of the can. Because of the propinquity of the axis of the turntable to the rotation axle of the can exchanger, the spatial separating interval of the following sequentially arrayed cans is very small. Because of this, as the draw frame continues operation during the can shifting of the exchanger, only a small quantity of fiber band will be fed out through the turntable, the short length of which will give rise to no disturbances in later working-up procedures.
Particularly advantageous, is an arrangement of the turntable in regard to the can which is found in the filling station in which the turn table, in relation to the can that is in the filling station position, is located in the leading portion of the can to be filled. By this means, time for the acceleration of the can exchanger will be gained until the filled can leaves the area of the turntable, so that the can exchanger, in spite of gradual acceleration, has already reached its full speed of rotation when the can carried by it reaches the area beneath the turntable. In this manner, the transition period of the delivery of fiber band between the filled can to the empty can will be a very short interval.
A further reduction of the time span for the transition period of the fiber band from the area above the full can to the empty can newly brought in, is attained by a further, advantageous design of the object. The spatial interval of a can in a ready-state position and/or a can in a reject position to the axis of rotation of the can exchanger is greater than the spatial interval of the can in the filling station from that axis of rotation. Also, the can guide between the ready-state position and the filling station can exhibit a linear section.
The fiber band should be deposited as long as possible in the can positioned in the filling station. Achieving this allows a further advantageous embodiment of the invention in which the turntable and the can exchanger are driven in a common rotary direction.
Advantageously, the relationships for the placements and controls of the drive, were selected so that the drive of the turntable and the can exchanger mutually co-act in such a way, as to the arrangement of the turntable and the cans which are found in the can exchanger, that the band feed opening of the turntable essentially follows the rejection movement of the filled can from the filling station position, until this can leaves the area of the turntable. The band feed opening, then, turns itself back to the empty can now nearing the filli
Brunner Armin
Naf Beat
Wagner Manfred
Weisigk Lars
Calvert John J.
Dority & Manning
Rieter Ingolstadt Spinnereimaschinenbau AG
Welch Gary L.
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