Textiles: cloth finishing – Napping – Planetary
Patent
1996-08-30
1998-01-20
Vanatta, Amy B.
Textiles: cloth finishing
Napping
Planetary
26 34, D06C 1100
Patent
active
057090157
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/EP95 /05182, filed Dec. 30, 1995.
BACKGROUND OF THE INVENTION
The present invention relates to an automated pile raising machine for fabric.
Pile-raising is a process giving a fabric a hairy, velvet-like appearance while simultaneously increasing the softness and heat insulating, as well as colour, characteristics thereof.
In raising machines, in particular in raising machines with metal trimmings, cleaning brushes are provided which are suitable for cleaning and sharpening the trimmings of pile and counter-pile cylinders. In particular, at least one pair of brushes must be provided, one of which can act on the trimmings of the raising pile cylinders, and the other on the trimmings of the counter-pile cylinders. In order to correctly perform such cleaning and sharpening tasks, the brushes are required to revolve perfectly in phase with the respective cylinders.
At present, this necessary timing of rotation of brushes and pile and counter-pile cylinder sets is accomplished by providing various types of mechanical transmission means, e.g., constituted by chains, toothed belts, gear wheels or sprocket wheels, or the like, between the pulleys or sprocket wheels of the motor means driving the revolving drum, and pulleys arranged integral with the shafts of the brushes.
The above structure results, for example owing to the natural arising of clearances in chain meshes, in rupture of belt and gear wheel teeth, and so forth, in the possibility of sudden loss of timing and/or motion transmission between the parts. Or, the loss can be also caused by external events, such as wear or improper service.
Although sometimes also a sensor is provided which in a relatively short time can cause the revolution-driving motor means to be stopped, the processed fabric gets often wound on the brushes, which remain in contact with the raising cylinders, with consequent damaging and blocking which imply long dead times of the whole raising machine.
Furthermore, it may happen that the cleaning brushes revolve out-of-phase relative to the drum, until they cause the irreparable damaging of the needles and metal points installed on the surfaces of brushes and cylinders.
A first minor remedy, however not so effective, is constituted by the presence of clutch means between the transmission means which transmit the revolutionary motion to the brushes, and the same brushes, which may slide by an angle of 180.degree. on an average, or, at maximum, corresponding to a complete revolution between the parts. However, in any case, fabric winding on the brushes may still occur in case of missed timing of the revolving elements.
A second type of remedy to limit the damage in the case lack of synchronism is constituted by a torque-limiting coupling, which rapidly acts on the cleaning brushes. Unfortunately, as a rule, regulating such a coupling is rather complex, because the intervention threshold torque value must be set by taking into account both the (relatively high) starting-up torque and the steady-state operating torques, which are considerably lower than the starting-up torques.
Furthermore, the presence of the above-cited transmission means implies, as a natural consequence thereof, a certain structural and maintenance complexity of the raising machine.
It should also be underlined that, should the brush/drum cylinder timing have to be changed, a whole series of changes in parts arrangements and adjustments and regulation operations must be carried out, possibly including all those mentioned above, with considerable increases in production costs due to machine dead times and lack of automation and reliability as to the correct execution of requests and necessary changes.
SUMMARY OF THE INVENTION
The purpose of the present invention is of providing a raising machine, in particular with metal trimmings, which does not display any of the above-cited drawbacks.
A further purpose is of providing a raising machine of the above-cited type which reduces as extensively as possib
REFERENCES:
patent: 4073043 (1978-02-01), Lowder
Denti Alessandro
Fedi Paolo
Comet S.p.A.
Sperotto Rimar S.p.A.
Vanatta Amy B.
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