Abstract: A device for bobbin doffing on a spinning frame. The device comprises a conduit connected to a suction source and means for replacing the bobbin with a yarn winding tube. This suction conduit is carried to move its suction inlet between a first position adjacent the yarn length stretched between a spinning unit and the bobbin, and a second position at which a pusher brings the yarn in contact with the surface of said winding tube.The invention is particularly suitable for use on open end spinning frames.

Abstract: A method for winding up a yarn reserve on a winding tube for a bobbin. The method comprises the steps of: continuously sucking the spun yarn, causing it to move through a circular yarn guide-positioning element, removably arranged coaxially with a yarn suction orifice; removing yarn positioning element from the suction orifice while the yarn being supplied and continuously passing therethrough; positioning said element above a yarn adherence zone of tube; breaking the yarn passing through the positioning element allowing the supplied yarn end to fall down on the tube adherence zone and into guide device, with yarn end facing externally of the tube end, and forming yarn reserve turns before winding the yarn bobbin.

Abstract: Cleaning device for spinning units. According to the invention, the device is placed on a carriage movable along a set of spinning units. The device comprises a pressure fluid supply and a suction supply carried by the carriage. The pressure fluid supply is selectively connectable to a blowing nozzle opening internally of the chamber of each of the spinning units, whereas the suction supply is selectively connectable with a suction duct opening in the spinning chamber and containing a check valve, the opening of which is controlled by the depression or vacuum built up by the suction supply.

Abstract: Cleaning device for open-end spinning unit, the device comprising a pivoted housing for a rotor, having a cover hinged to a frame. The device comprises means to stop cover movement to an angular position in which the axis of a telescopic tube mounted on the cover and connectable to a fluid pressure source, passes by the fiber collecting surface of the rotor. The tube end is provided with a baffle for directing fluid tangentially to the rotor and a curtain provided for sealing the space between the cover and the housing in their open condition.

Abstract: Device for yarn paraffining with solid paraffin in textile machines. The device comprises a block of paraffin carried by a support rotating on and sliding along a pin; a lever acting against the paraffin support and a return spring connected to the lever at a connection location angularly rearwardly displaced relative to the lever end acting on said paraffin support.

Abstract: A device for reinserting the broken yarn in an open end spinning unit, comprising a yarn gripping element, attached to an endless belt passing in front of a yarn gripping position on the winding up bobbin and a device for reinserting the broken yarn in the spinning unit; control means act on the belt to move the yarn gripping member from the gripping position to the reinserting position in the spinning unit and then stopping it at least at a location of the path of the endless belt.

Abstract: An apparatus and a method for yarn length measuring according to rotations of a shaft. Rotation of said shaft generates reference pulses which are converted on a manually settable device, into count pulses with a frequency ratio presettable in accordance with the ratio of the yarn length to be measured and a fixed count capability. Counters are provided for each working station of a textile machine which, independently, effecting the count for a same number of count pulses as said counting capability.

Abstract: An automatic positioning device for the control cams of the needle selecting cylinders on a circular knitting machine. According to the invention, the device comprises a portion fixed to the machine frame and a portion movable and rotating with the needle cylinder. The movable portion of the device comprises a cam support movable between extreme positions and cooperating with a retaining means operable by the fixed portion of the device to release, lock the cam and maintain it at predetermined positions between said extreme positions. On the other hand, the fixed portion of the device comprises a release member for said retaining means and cam positioning members, the cam release and positioning members being operated through linkages by a mechanical programming device.In known prior art devices such as U.S. Pat. No. 3,766,753, a control cam is disclosed which has several profiles. The cam is positioned in a vertical direction in order to bring a desired profile into alignment with a cam follower.

Abstract: A lock for circular knitting machines. According to the invention, a lock or cam comprises a fixed lock element supporting or carrying cams defining the guide tracks for the knitting needle heels, causing the outgoing and re-entering movements of said needles; such cams are secured to a slider movable between extreme positions within a guide of said fixed lock element. The slider has a threaded portion engaging a first screw thread of a manually operable adjusting element for the slider stroke, which adjusting element is provided with a second screw thread in opposite direction to the former; this second screw thread screwing in a threaded seat of the fixed lock element, so that at a rotation of said adjusting element there would correspond an overall displacement of the cam carrying slider equal to the sum of the displacement of said slider relative to the adjusting element and of that of the latter relative to said fixed element.

Abstract: A machine for inserting pins or pegs in the holes of needle selecting cylinders for circular knitting machines. According to the disclosure, the machine comprises a cylinder spindle and a side support movable longitudinally of the spindle, having placed thereon a device for inserting the pins in the holes of said cylinder; said device being controlled to sequentially operate by signals provided by a device for directly reading the pattern; a pin feeding means having a gravity storage means provides for feeding the pins in aligned relationship in front of a pusher member of said inserting device.