Textiles: spinning – twisting – and twining – Apparatus and processes – Doffing or donning
Patent
1981-03-10
1983-06-28
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
Doffing or donning
D01H 904
Patent
active
043898408
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Method of automatically doffing the full bobbin packages from, and donning the empty bobbin tubes onto, the spindles of a preparatory spinning machine equipped with at least one row of spindles and with flyers, each rotatably supported in a flyer head above a spindle, and consisting of two flyer arms and a flyer yoke, as well as an apparatus for implementing the method.
Preparatory spinning machines of this type, also called flyer, are used in the spinning process for staple fibre spinning in the penultimate stage of the manufacturing process. They are used for producing a draftable roving, which is wound onto a big-sized bobbin package and is creeled to the subsequent processing machine, normally the spinning machine. Due to the trend of producing bobbin packages of ever-increasing size, and thus weight, the operation of manually exchanging full bobbin packages against empty bobbin tubes has become ever more difficult for the operating personnel, and thus many attempts have been undertaken already of adapting the shape and construction of the working elements, and particularly that of the spindles and flyers, for establishing the conditions allowing for a mechanisation of the operation.
Thus, a preparatory spinning machine of the type mentioned initially is known from Swiss Pat. No. 442,090, in which each flyer is supported in an upper support, mounted fixedly with respect to the room, and is driven, and supports a donning pinfor the bobbin tube, and in which a vertically movably guided bobbin support member supports the spindle in the form of a short donning pin. As the bobbin support member is lowered for the doffing operation the donning pin of the flyer is lifted off the bobbin tube, in such manner that the bobbin package merely rests on the short donning pin of the spindle. As the bobbin support is lowered further, the distance between the lower end of the donning pin of the flyer and the upper end of the bobbin tube exceeds the depth of penetration of the donning pin of the spindle into the bobbin tube. Owing to this arrangement the full bobbin package now can, after being lifted above the donning pin of the spindle, be moved off at a bias to the spindle and to the longitudinal axis of the machine. An empty bobbin tube also can be brought in at a bias to the spindles and to the longitudinal axis of the machine in the free room or space between the spindle and the flyer, and can be donned onto the donning pin of the spindle by slight lowering. As the bobbin package support member is lifted into the working position the bobbin tube now is brought into the correct position relative to the flyer, with which process the exchange operation is to be considered finished. This device, in which elements for corresponding movements at a bias of the bobbin packages and of the bobbin tubes are provided, realizes the mechanized exchange of the bobbin on a preparatory spinning machine.
This arrangement, however, shows several considerable disadvantages. Thus, the bobbin support member is required to be lowerable over more than the whole bobbin tube length, or outside the normal lift range of the bobbin support member. This implies an unfavourably high position of the working elements during normal machine operation, which involves operational disadvantages.
Furthermore, doffing "at a bias" of the bobbin packages implies blockage of the room or space in front of the machine, namely before the exchange operation by the bobbin tubes held in readiness, and after the operation by the full bobbin packages doffed. The working elements required, formed as fork-shaped grippers which are pivotable about a vertical axis, hamper the operation of the machine at all times.
According to a similar proposal shown in German Pat. No. 2,543,842 there are also provided lowerable spindles and flyers located at fixed level with respect to the room and equipped with a donning pin. In this arrangement, however, the bobbin packages and the bobbin tubes no longer, as in the above mentioned example, are moved at
REFERENCES:
patent: 246469 (1881-08-01), Daly
patent: 1049545 (1913-01-01), Stell et al.
patent: 1263714 (1918-04-01), Stell et al.
patent: 1263715 (1918-04-01), Stell et al.
patent: 3935699 (1976-02-01), Iida et al.
Briner Emil
Gasser Hermann
Novak Peter
Tanner Bruno
Kleeman Werner W.
Petrakes John
Rieter Machine Works Limited
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