Winding – tensioning – or guiding – Strand tensioning device – Clamp
Patent
1992-11-03
1994-08-09
Gilreath, Stanley N.
Winding, tensioning, or guiding
Strand tensioning device
Clamp
242 4701, 242131, B65H 5924
Patent
active
053358783
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention refers to a thread braking device.
When a thread is supplied from a supply coil to a consumer, e.g. a weaving machine or a knitting machine, a thread feeder will be used for eliminating variations of thread tension and for offering the thread to the consumer under the best possible conditions. Thanks to the thread feeders, an extraordinary increase in the processing speed could be achieved without increasing the strength of the thread. The thread feeder, e.g. a thread storage and feed device, has its axis positioned in alignment with the location where the thread is inserted into the consumer, e.g. the shed of a weaving machine, so as to guarantee the smallest possible deflection in the thread path to the consumer. One or several thread supply coil(s) from which the thread feeder draws off the thread can, normally, not be brought into alignment with the then fixed axis of the thread feeder. The reason for this is to be seen in space conditions and in the way in which the operators change the supply coils. The knotting together of threads coming from several supply coils will automatically result in various directions of supply to the thread feeder. For guaranteeing proper functioning of the thread feeder, a certain basic tension of the thread coming from the supply coil will be expedient. Hence, a thread braking device is provided on the supply side of the thread feeder. In order to prevent the incoming thread from getting entangled in the thread braking device, a shield surface is fixedly arranged on the thread braking device, said shield surface being either a flat plate or a spherical cup. The shield surface should be positioned transversely to the supply direction of the thread so that the surface producing the shielding effect is as large as possible. It is therefore necessary to position the thread braking device such that it extends at an oblique angle relative to the axis of the thread feeder. This, however, will result in an undesired deflection of the thread between the thread braking device and the thread feeder, i.e. at a location in the thread path ahead of which the braking device produces tension in the thread. Depending on the deflection angle and the friction, this will cause an augmentation in tension increases and, especially, tension peaks which are generated when the thread is unwound from the supply coil. This will result in the risk of thread breakage.
Sometimes, at least one thread opening has to be arranged in a stationary manner along the path from the supply coil to the consumer. In order to prevent the thread, which is animated (ballooning) during its journey and which will occasionally sag in response to speed variations, from getting entangled in the obstacle formed by said thread opening, the thread opening will be arranged in a large-area shield surface, which is positioned transversely to the supply direction of the thread and which will prevent the thread from getting entangled, whereby thread breakage would be caused.
The present invention is based on the task of providing a thread braking device and a shield surface, respectively, by means of which the above-mentioned disadvantages are avoided. In the case of a thread braking device located on the supply side of a thread feeder, the number of thread breakages is to be reduced. In the case of a shield surface used for general thread guiding tasks, the best possible shielding effect, which will prevent thread breakage in this area, is to be always guaranteed.
The thread braking device, which is intended to be used on the supply side of the thread feeder, can be aligned with the axis of said thread feeder in such a way that there will be no deflection downstream of the thread brake, which would increase the risk of thread breakage. Also the risk of entangling of the thread in the thread braking device is reduced because the shield surface can be adjusted to the supply direction of the thread in each case in such a way that the shield surface which becomes effective is as large as possible.
REFERENCES:
patent: 4471917 (1984-09-01), Whisnant
Gilreath Stanley N.
Iro AB
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