Patent DE-19850008-A1 (DE)
Title: Grinder for covering of napping or carding roller
Inventor: SCHMID GUENTHER
IPC: B24B19/18
Filed: 1998-10-30
Abstract: The sharpening or roughening apparatus is used with a napping machine, to sharpen the napping cylinder. It has a grinding pad with a recess at its underside to pass over a cylinder section of the napping roller (8) and be carried by it. The grinder rests on the napping roller at least near a vertical axis. A guide, over the napping roller (8), gives a sliding support with a straight guide path for the grinder. The grinder has at least one roller to ride in the guide, using a block over the grinding pad with a carrier for two guide rollers. The carrier is bolted to the block. A ring is at the upper end of the mounting bolts. The block length is set so that at least one end projects over the grinding pad. At least one blade is at the lower edge of the block, near the grinding pad, to engage the cylinder. The longitudinal axis of the blade can be set at an angle on an orthogonal plane in relation to the longitudinal axis of the napping roller. An identical array of blades is at both ends of the grinding block, at the same angle to the plane. The blades are on swing mountings, with a swing axis at least close to the vertical axis of the grinder. The blades are each mounted to a shaft in the block, sprung towards the vertical axis, preferably through a spring between the lower edge of the block and the blades. The upper ends of the shafts are coupled for a synchronized movement, preferably keyed to a swing lever. A linkage head with a control rod is at the swing levers. A control slide, linked to the coupling, works with end limit stops at the napping machine. Two control rods are linked to the slide at one of their ends, with their other ends to engage at one of the swing levers. The slide moves at the upper side of the block, with a system to hold it in one of two defined settings up to a defined changeover force. The system has an opening in the upper side of the block, to hold a ball which projects partially over the upper side of the block. The underside of the slide has two recesses to be engaged by the projecting ball surface as required. At least one permanent magnet can be fitted, with a gap between it and a magnet material which is varied by the slide movement, or two pairs of permanent magnets are used with their facing ends of unlike polarity. The maximum gap between one pair is when one of them is in the end position while the magnets of the other pair are close together. A crosspiece is fitted to the bolts mounted at the block, with a permanent magnet at each end, and two angles at the slide each carry a permanent magnet. At least one permanent magnet in each pair has an adjustable mounting along the length of the slide. The recess has the shape of the section of a hollow cylinder, with a curvature radius matching the diameter of the napping roller. An Independent claim is included for the operation of the grinder, at a napping machine, where the grinder is moved in cycles along the length of the napping roller to sharpen the cylinder. The grinding action is applied through a pressure derived from the gravity of the grinder unit. The grinder is held by the guide, for the roller rotation to apply a torque direction for the grinder to be moved along the napping roller, using the roller rotation as the drive for the grinding cycles. PREFERRED FEATURES The blades engage the needles of the roller cylinder at an angle, for the roller rotation to impart a movement effect on the grinder to advance it along the roller length. When the grinder reaches the end of the roller, a limit stop moves the slide into the other setting, and the blades are swung clear of the working plane.