Abstract: The device for detecting breakage of leno threads in leno selvedge devices on looms, the leno selvedge forming device being provided with at least two arms for guiding at least two leno threads, the leno threads being twistable together by virtue of the rotation of the arms, the device (12, 13, 14, 14a) for detecting thread breakage being provided with a facility (13, 14) for determining the natural oscillations of the arms (12) and a loom, more specifically with heald frames, with at least one leno device which is reversible in its direction of rotation and with a facility for detecting breakage of the leno threads, the device for detecting thread breakage being arranged in the front shed (V), more specifically between the leno device (10) and the heald frames (20).
Abstract: A yarn storing device (1) comprises a storage drum (2) and a sensor (5) arranged at the withdrawal end (3) of the storage drum (2). The sensor (5) has the form of an eyelet (6) for guiding the yarn (4) and generates a signal during the withdrawal of yarn (4) having a frequency corresponding to the number of turns of yarn withdrawn per time unit. For enhancing the reliability of detecting the withdrawal of yarn on the basis of the sensor signal, the eyelet (6) of the sensor (5) is movably mounted on a housing (7) of the sensor (5) and comprises a light-reflecting surface (11) wherein a light-emitting element (8) and a light-receiving element (9) are fixed to the housing (7) such that the light generated by the light-emitting element (8) falls on the light reflecting surface (11) and is directed towards the light-receiving element (9) when the eyelet (6) has a predetermined relative position with respect to the housing (7).
Abstract: The invention relates to a thread movement sensor comprising an arm with at least one thread guide. The invention solves the problem of sensitivity of the sensor to the vibrations of the machine by making a part of the arm an element of a magnetic circuit of coil, the latter being connected to the control circuit of a knitting machine.
April 3, 1986
Date of Patent:
December 1, 1987
Elitex koncern textilniho strojirenstvi
Otakar Curda, Jaroslav Maxa, Pavel Uhlir
Abstract: A filament supplied to a textile machine is held under tension by a thread mounted on a weighted or otherwise biased lever which trips a switch to arrest the machine upon rupture of the filament. In normal operation, the lever is held against a stop by the tension of the thread supplemented by the force of a magnet whose attraction diminishes rapidly over the swing range of the lever, the biasing force slightly exceeding the magnetic force in the normal lever position to prevent oscillations in response to minor fluctuations in filament tension but to initiate a rapid cutoff in the event of a break.