Patent GB-1166715-A (GB)
Title: An Improved Grinding and Measuring Machine
Inventor: KRUGER KARL HEINZ
IPC: B24B49/00
Filed: 1967-03-09
Abstract: 1,166,715. Grinding. ELEKTROMAT VEB. 9 March, 1967, No. 11041/67. Heading B3D. A machine for grinding and automatically measuring coils in layer resistances comprises a transport device 25, 26 for supplying and removing resistance bodies, two feed devices 1<SP>1</SP>, 1<SP>11</SP> with axially displaceable and rotatable spindles 2<SP>1</SP>, 2<SP>11</SP>, an adjustable and pivotable grinding head 15 and grinding disc 16 which may be locked in a control position between positions in which the disc can be swung to engage a body received in one or the other feed devices. The feed devices are arranged in parallel and each consists of a pair of hollow spindles 2<SP>1</SP>, 2<SP>11</SP> formed as pneumatically operated pistons movable agains spring pressure. Each pair of spindles is rotat able by gearing 7 connected by magnetic couplings 6 to a variable gear 5 and motor 4. The feed device 1<SP>1</SP> is movable from a centre position A to a position B upon release of a toggle 12<SP>1</SP> by a spring 11<SP>1</SP> and is moved from position B to position C to carry a resistance body past the grinding wheel by a toothed rack connected by a coupling 10<SP>1</SP> to a gear 9 and motor 8 and tachoalternator. Thereafter, the spring 11<SP>1</SP> returns the feed device to position A as determined by the toggle 12<SP>1</SP>. The feed device 1<SP>11</SP> is operated to move first from A to C, then from C to B and finally from B to A simultaneously to the movement of the feed device 1<SP>1</SP>. The transport device connects fixed member 25 and a movable member 26 each formed with notches 27 for receiving the resistance bodies from a separator 31, the member 26 being carried by cranks which are rotated to advance the bodies one notch at a time along member 25, the separator being operated so that the bodies are placed on every other notch. At positions below the spindles 2, tongs 34<SP>1</SP>, 34<SP>11</SP> can be operated to convey the bodies between the member 25 and the spindles 2<SP>1</SP>, 2<SP>11</SP>. After grinding, and if within acceptable resistance limits, the bodies are carried to a storage unit 45; if outside the limits, they pass to a waste 43. The grinding wheel 16 is carried on a pivoted head 15 which can be held in a central position by links 18 urged by a spring 17 to a closed position and releasable by a pressure magnet 24. The head is also connected by springs 22 to magnets 20, 21 which can be operated so that the grinding wheel is resiliently urged into engagement with one or other of the bodies so it is carried by the spindles 2<SP>1</SP>, 2<SP>11</SP> past the grinding wheel. Bridge circuits 37, 38 are connected to the resistance body to be ground, one circuit measuring the starting value and controlling the speed of the motor 8 advancing the rotating body, and the other circuit measuring the finishing value to determine whether or not the body is acceptable. The feed devices are so arranged that while one body in one spindle is being ground, a ground body is exchanged for an unground body in the other spindle. The grinding disc is vertically adjustable to compensate for wear.