Textiles: fiber preparation – Assembling – Formed silvers
Patent
1991-12-10
1993-07-20
Crowder, Clifford D.
Textiles: fiber preparation
Assembling
Formed silvers
B65H 5480
Patent
active
052281728
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for depositing a fiber strand in a can, comprising a housing and two rotary plates mounted in said housing for rotation about their respective axes, a smaller one of said rotary plates being mounted at an eccentric position internally of the outer periphery of the other, larger rotary plate, and a lay-down pipe having its outlet end connected to said eccentrically mounted rotary plate, whereby said outlet end of said lay-down pipe describes a cycloid path in operation of the apparatus, both of said rotary plates being driven via belt transmissions.
An apparatus according to the features of the generic clause is known from EP-A-O 010 002. The apparatus described in this publication is composed of two side-by-side can mountings including two large rotary plates internally of which smaller rotary plates are rotatably mounted at eccentric positions. For rotating the smaller rotary plates there is provided a belt transmission in a quadrilateral arrangement which is synchronized with a belt transmission for the large rotary plates. To this effect, a driving pulley and a return pulley are mounted at a fixed position outside of the two large rotary plates. The positional variation of the small rotary plates caused by the eccentric displacement thereof requires the provision of two paired can mountings, as this permits the positional variations of the small rotary plates to be compensated.
This arrangement as a whole is rather complicated, particularly as regards the uniformity of the belt tension. Moreover, the known apparatus occupies a relatively large installation volume.
From DE-AS 15 10 339 there is further known a can mounting in which the large rotary plate is provided with external teeth and rotated via a gear transmission. The fiber strand is introduced by a feed roller pair into a fiber strand passage provided in the smaller rotary plate, with the feed roller pair performing a rotary movement corresponding to that of the large rotary plate. This construction, too, results in a rather bulky can mounting extending far beyond the outer periphery of the spinning can.
It is therefore the object of the present invention to provide a can mounting of compact construction.
To attain this object, the invention provides that the two rotary plates are coupled via at least one revolving belt transmission, that the lay-down pipe is composed of a plurality of pipe sections associated with the rotary plates and rotatable relative to one another, and that a pneumatic pressure injector is provided at least at the outlet end of the lay-down pipe for the automatic threading of the fiber strand.
The coupling of the two rotary plates via at least one revolving belt transmission has the effect that the belt transmissions are located within the base area of the large rotary plate, and that the belt tension is always maintained constant, so that no particular devices are required for this purpose. The belts of the revolving belt transmission extend around the lay-down pipe, the belt driving the small rotary plate revolving clockwise about the lay-down pipe section located in the axis of the large rotary plate. This results in a very compact construction. An important role is played in this context by the pneumatic pressure injector provided for automatically threading or feeding the fiber strand, the combination of the automatic fiber strand feeding operation with the revolving belt transmission permitting the periphery of the can mounting to be reduced to that of the large rotary plate.
Although the use of a pneumatic pressure injector for the automatic threading or feeding of the fiber strand is known from DE-OS 37 22 772, rotation of the rotary plates is brought about in the conventional manner, which does not permit a compact construction of the apparatus.
An advantageous aspect of the invention results from the provision that the pneumatic pressure injector is connected to a pneumatic pressure line through two rotary couplings associated with the rotary axes of the rotary plates
REFERENCES:
patent: 4041574 (1977-08-01), Muller
patent: 4236278 (1980-12-01), Hoover
patent: 4372010 (1983-02-01), Gauvin
patent: 4809405 (1989-03-01), Bruderlin et al.
patent: 4967449 (1990-11-01), Gasser
patent: 5111551 (1992-05-01), Hollingsworth et al.
Curiger Karl
Gasser Hermann E.
Crowder Clifford D.
Hollingsworth GmbH
Neas Michael A.
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