Textiles: spinning – twisting – and twining – Apparatus and processes – Driving
Patent
1984-09-20
1987-01-13
Levy, Stuart S.
Textiles: spinning, twisting, and twining
Apparatus and processes
Driving
57100, D01H 1300
Patent
active
046354310
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a machine for producing twisted filaments.
BACKGROUND OF THE INVENTION
A machine for producing twisted filaments may be constructed, for example, as a ring spinning frame, a ring twisting machine, an open-end rotor spinning machine, an open end friction spinning machine or the like. The common to these types of machines is that they produce twisted filaments. Suitable starting materials for twisted filaments of this kind include, for example, spun fibers and continuous filaments. The operating units of machines of this kind, such as the spindles, rotors, separating rollers and the like are driven with whorls by means of tangential belts. As a result of the looping of the driven whorls, however slight, and their pressing rollers caused by the tangential belt, there is considerable energy consumption and wear on the belt over the large number of operating units. This energy consumption and wear on the belt increases as the number of operating units increases overall, but also for each operating unit, since the tangential belt must be made thicker and/or wider for a larger number of operating units in order to transmit the power required.
In order to reduce the energy losses and cut down the wear on the tangential belt it has already been proposed to provide a deflecting pulley driven by the tangential belt and having the tangential belt looping round it not only at one guide point at the end but at both guide points, one at each end (DE-OS No. 21 08 335).
However, since machines of this type cannot always have two deflecting pulleys for the tangential belt even with larger and larger numbers of operating units, the possibility of avoiding energy consumption and wear by this method is very limited. Furthermore, since it has been found that the energy losses caused by the operation of the tangential belt, per operating unit, are at a minimum with a drive arrangement designed for about 250 operating units, but it is industrially desirable and useful to fit a machine for producing twisted filaments with more than 250 and possibly up to 1,000 operating units, an objective of the invention is to introduce possible ways of introducing additional energy into a single tangential belt of the type described.
OBJECT OF THE INVENTION
It is, therefore, an object of the invention to provide a low-waste, inexpensive tangential belt drive for machines for producing twisted filaments comprising a large number of operating units without having to increase the spacing between the operating units at individual points, thereby taking up more space, and without the need for any additional major looping.
SUMMARY OF THE INVENTION
According to the invention, this object is achieved by pressing the tangential belt against a drive friction roller with no or only little looping, i.e. with no substantial looping not only at its guide points at the two longitudinal end regions of the machine but additionally at at least one other point along its substantially straight path, by means of a pressing roller or a whorl, and driving the belt by means of this drive friction roller.
In this way, at least one additional drive point is provided which does not stress the tangential belt by considerable looping. Under certain conditions, the additional drive point makes it possible to reduce the stress on the tangential belt, as well as reducing the energy losses. The additional drive point is located, for example, at the center of the length of the belt. In a two-end machine, at least one driven friction roller according to the invention is advantageously provided at each end of the machine.
According to a further embodiment of the invention, the pressing roller is formed by the whirl of one of the operating units. The spacing between adjacent operating units does not need to be enlarged. In order to be able to retain the mounting of the whorl and not have to allow any special constructions, the whorl is advantageously associated with a counter roller which relieves its mounting of the contac
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patent: 2791318 (1957-05-01), Johnson et al.
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patent: 4161862 (1979-07-01), Hartmannsgruber et al.
Dubno Herbert
Hail III Joseph J.
Levy Stuart S.
Ross Karl F.
Zinser Textilmaschinen GmbH
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