Textiles: spinning – twisting – and twining – Apparatus and processes – Doffing or donning
Patent
1981-05-28
1984-01-24
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
Doffing or donning
57 67, 57276, D01H 904
Patent
active
044268360
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED CASE
This application is related to the commonly assigned, copending U.S. application Ser. No. 06/261,153, filed Apr. 20, 1981, now U.S. Pat. No. 4,375,744, entitled "APPARATUS FOR CONTROLLING THE ROTATIONAL SPEED OF THE SPINDLES OF A SPINNING PREPARATORY MACHINE", and listing as the inventors EMIL BRINER et al.
BACKGROUND OF THE INVENTION
The present invention concerns a spinning preparatory machine (or roving frame) containing a machine frame and spindles arranged therein in at least one row and with flyers suspended thereabove and pivotable about a common, virtual or imaginary longitudinal axis of the machine between an operating position and a doffing position where the bobbins can be unobstructedly upwardly doffed from the spindles.
A spinning machine of this type is described, e.g. in the commonly assigned, copending U.S. application Ser. No. 06/243,947, filed Mar. 10, 1981, now U.S. Pat. No. 4,389,840.
The pivotability of the flyers in a spinning preparatory machine of this type, also called roving or fly frame, decisively improves the operability of the machine, particularly the bobbin doffing and donning operation.
As the flyers can be pivoted away above the spindles it is possible to doff the completed bobbins, placed on the spindles, in vertical direction and to remove them from the spindles, and also to donn new, empty bobbins in vertical direction onto the spindles. This facilitates the doffing and donning operation for the operators, if this operation is to be effected manually, or, respectively, renders automation of this operation feasible, as explained in detail in the above mentioned U.S. application Ser. No. 06/243,947.
SUMMARY OF THE INVENTION
It is an important object of the present invention to provide for a spinning preparatory machine of the type initially mentioned, a design of the elements supporting and pivoting the flyers of a row, in which: effected and maintained precisely and securely; i.e. absolute parallelity of all flyers of a row is maintained; the whole row are maintained securely in this position also in case of an electrical power failure; flyers are in their operating position, are avoided; as advantageously as possible with respect to the prevailing forces, in other words these elements are relieved of the forces or loads as far as possible. This relates particularly to the longitudinal elements (i.e. the elements extending in the longitudinal direction) of the machine.
This object is achieved in a spinning preparatory machine of the type mentioned above, in that the flyers of a row are supported in a frame which comprises a longitudinal beam and at least two arms arranged at right angles thereto, which at their free end are supported in the machine frame so as to be pivotable about a pivoting axis. In their operating position the arms are pressed against a first stop provided on the machine frame by at least one pivoting and loading system containing a spring. The pivoting and loading system is kinematically connected to the machine frame in such manner that in the operating position it is brought into a locked position where the loading pressure is lower, after passing a labile or unstable position in which the loading pressure is maximum.
The desired self-locking action in the operating position of the frame supporting the flyers of a row is achieved in that the frame passes a labile or unstable position. This ensures high operational reliability and security against accidents for the operators working at the machine. The frame supporting the flyers in its operating position is always pressed by spring pressure load against a first stop provided on the machine frame, and thus the accurate positioning of all flyers of a row is ensured, the occurrence of vibrations in this position is avoided, and the longitudinal elements are relieved from forces or loads. Support or mounting of the flyers of a row in a frame, as contemplated, ensures also for the symmetric positioning of all flyers in a row, and there is maintained absolute mutual
REFERENCES:
patent: 1590865 (1926-06-01), Stell et al.
patent: 3380238 (1968-04-01), Araki et al.
patent: 3935699 (1976-02-01), Iida et al.
Briner Emil
Gasser Hermann
Novak Peter
Kleeman Werner W.
Petrakes John
Rieter Machine Works Limited
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