Textiles: weaving – Miscellaneous – Loom cleaning
Patent
1996-09-16
1999-01-26
Falik, Andy
Textiles: weaving
Miscellaneous
Loom cleaning
139452, 139110, D03D 5102
Patent
active
058628355
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a drive device in a weaving machine comprising an asynchronous motor which can be powered from an electric power supply network operating at conventional frequency, e.g. a frequency of 50 or 60 Hz, for example. The asynchronous motor exhibits, or is connected to, a motor control and drives a drive unit/drive shaft in the weaving machine via a speed-reducing unit.
The invention also relates to a device for increasing the efficiency in a weaving machine system comprising one or more weaving machines and in which a respective weaving machine can be driven by an asynchronous motor which can be powered from an electric power supply network. The invention also relates to a device in a weaving machine which can be driven by means of an asynchronous motor which in a drive system, actuates the drive unit/drive shaft of the weaving machine via a speed-reducing apparatus and in which at least one flywheel is arranged to smooth peaks of torque caused by the fact that the weaving machine, during the weaving cycle, has a varying torque requirement. Finally, the invention relates also to a device in a weaving machine which can be driven by means of an asynchronous motor which actuates the drive unit/drive shaft of the weaving machine via a speed-reducing apparatus and in which a computer apparatus is arranged to predict optimal weaving machine speed for a respective yarn character. By yarn character is here meant quality, thickness, etc.
Regarding the types of weaving machines in which the invention can be used, weaving machines of the "Air Jet", "Water Jet" type, gripper weaving machines, projectile weaving machines, etc. can be mentioned.
It is previously known to use an asynchronous motor to drive a weaving machine of the type in question. The motor size for the particular types of weaving machines can be within the range of about 3-6 kW and can operate at a rotation speed of between 1400 and 2800 r.p.m., i.e. 2 and 4-pole asynchronous motors are utilized. The rotation speed of the weaving machine can lie in the range 500-1200 r.p.m., which means that the drive apparatus in question comprises a speed-reducing unit between the asynchronous motor and the drive member/drive shaft of the weaving machine.
The rotation speed of the weaving machine is dependent, among other things, upon the mechanical strength of the yarn in question. Higher speeds of the weaving machine produce higher load on the yarn and vice versa. Changes to the speed of the weaving machine have thus generally involved altering the setting of the speed-reducing apparatus (e.g. by a change of wheel in the gearbox and by similar techniques).
It is also known, in connection with weaving machines and their utilized asynchronous motors, to make use of a motor control/motor controls. This usage has hitherto involved adjusting the existing rotation speed of the asynchronous motor downwards in relation to its normal operating speed. If, for example, the motor is designed to operate at the rotational speed of 2800 r.p.m., a downward adjustment has been made from a rotation speed close to this to a lower rotational speed, e.g. to a rotational speed of 2000 r.p.m. or higher. It is possible per se to adjust the rotational speed of a standard motor upwardly, but with the disadvantage that the torque falls in proportion to the rotational speed increase. Power losses have thereby been generated and the motor control as such has been regarded, moreover, as a purely additional auxiliary apparatus which gave rise to an additional investment cost. The above disadvantages have hitherto had to be offset by higher productivity or by lower profits.
The object of the invention is to propose a device which solves, among other things, these problems. The invention makes it possible, moreover, to use a smaller motor of substantially lower (e.g. 50% lower) weight. This, together with the increased efficiency, means that the motor control as such pays for itself within a relatively short (e.g. 6-month) running or usage period.
REFERENCES:
patent: 4100942 (1978-07-01), Tshudi
patent: 4129154 (1978-12-01), Bennelli
patent: 5306993 (1994-04-01), De Fries et al.
patent: 5500581 (1996-03-01), Hatanaka et al.
patent: 5522434 (1996-06-01), Lindblom
"ABB Handbok Industri," published 1993, ABB Industri-Gruppen, pp. 125-127. No English Translation.
Falik Andy
Iro AB
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