Patent DE-19900626-A1 (DE)
Title: Assembly for winding a number of bobbins on a bobbin spindle
Inventor: WOLF KLAUS
IPC: B65H54/54
Filed: 1999-01-11
Abstract: The bobbin winder machine, to wind a number of continuous yarns, has a holder (18)  for two coupled bobbin spindles (2) with couplings (20,22) which move in relation to each other. One coupling (20) is fixed and the other coupling (22) is locked to the spindle (2). Through the movements of the spindle carrier, the couplings (20,22) are engaged together or separated apart. The couplings (20,22) of the bobbin spindles in the holder (18) of the bobbin winder, are coupled by magnetic force, using a magnet (20) and an end plate (22). The magnet (20) is attached to the machine frame, and the end plate (22) which can be magnetized, rotates at the end of the bobbin spindle (2), to be moved by the spindle carrier into the force field of the magnet (20). The magnet (20) is mounted to the holder (18) with an elastic damper (21), and is preferably a permanent magnet, with a magnetic holding force which is weaker than the drive torque from the rotary drive (6) of the spindle carrier. Alternatively, the magnet is an electromagnet, with a controlled magnetic field strength. The holder (18) has a carrier (19) bonded to the machine frame (1) for the  magnet (20) with a laying surface (44). The end plate (22) is fixed to a push rod (23) with axial movement, and rotates with the spindle (2). The magnetic field of the magnet (20) acts on the end plate (22) to draw the push rod axially from a rest position into a working position against the surface (44) of the magnet (20). The magnet surface (44) is formed by a laying plate which can be magnetized over all or part of the movement range of the bobbin spindle (2) during full bobbin winding cycle. A number of magnets can be at the laying plate, next to each other on a plane. The end plate (22) is connected to a spring so that, when not coupled, the end plate (22) is retracted into the rest position. The end plate (22) also has elastic mountings at the bobbin spindle (2), and the push rod (23) is contained in a bush, supported at the bobbin spindle (2) mantle by an elastic mounting at the periphery. The couplings can have a positive fit coupling action between them as a prong and a groove; the prong being at the free end of the bobbin spindle (2) to act with a positive fit at the groove in the holder (18). The groove matches the guide path of the bobbin spindle (2), so that the prong slides in the groove during running. The groove extends over part of the guide path, with an entry to hold the prong and an outlet to release it. A ratchet in the groove, between the entry and exit ends, holds the prong during bobbin winding cycle. One end of the prong rotates at the bobbin spindle (2) and the other end has a shoulder to give a positive fit in the groove. The prong and its shoulder have smaller dimensions than the bobbin spindle diameter. The prong is fitted to the spindle with an elastic mounting, in a bush with an elastic mounting at the spindle mantle, and has axial movement at the spindle, against a spring. At least one elastic sliding unit is provided between the prong and the groove at the holder. The groove, at the holder (18), has a T or L cross sectional shape, for the prong shoulder to be inserted into its wider section. The spindle carrier is a turret, with a second bobbin spindle (3) offset from the bobbin winding spindle (2) by about 180 deg  so that, on rotation of the turret, the bobbin spindles (2,3) are brought alternately into the bobbin winding zone, and coupled to the holder (18) when in the working setting. In the working setting, the spindle prong engages the groove at the holder. An Independent claim is also included for the bobbin winding operation, where the bobbin spindle is automatically coupled to the holder by the spindle turret movement. Preferred Features: The holding forces on the spindle can be varied during bobbin winding, using an electromagnet with a controlled magnetic field strength. The axial gap between a pressure roller and the bobbin spindle is increased, during the winding of a bobbin with an increasing diameter, by the powered movement of the spindle carrier. The magnetic field of the electromagnet is controlled during spindle carrier movement to reduce below the level of the magnetic field strength when the spindle carrier is static.