SU1635957A1 - Apparatus for regrinding machining tools - Google Patents

Abstract

A device for sharpening a working tool 1, especially a rotatable wire brush for roughening a lasting margin of a shoe upper, consists of a holder 3 carrying a sharpening element 31 and slidably mounted on a structure 2 supporting the working tool 1. The piston rod 42 of a pressure cylinder 4 is connected to a balance lever 5 pivoted on the holder 3, one arm of which is provided with a pawl 51 adapted for engaging ratchet teeth 24 formed on the structure 2, and to the other arm there is connected a spring 52 anchored to an adjusting screw 53 which is screwed in a bracket 35 on the holder 3, the screw 53 being secured by lock nuts 54. <IMAGE>

Description

The invention relates to equipment for sharpening a machining tool, in particular a circular brush for ruffling the tightening edge of a tucked-in shoe, which consists of a bearing structure of a sharpening tool located in the main body of the machining tool and connected to the stem of the working cylinder.

A known machine (US Patent No. 3,811,405, cl. C 14 V 1/44, 1977) uses a circular wire brush mainly to tousle the drawn edge of the tightened billet. During the treatment, the ends of the individual wires are blunted, therefore, at certain intervals, the blunted ends of the wires should be sharpened by turning the entire circular surface of the wire brush, which they fill. This sharpening is usually carried out with a bar, which is pressed with a certain force against the circular processing surface of the wire brush. After pressing it is necessary to block the bar to achieve the desired accuracy of the geometry of the circular machining surface.

A device is known (Patent DE No. 2519083, cl. A 43 P 37/00, 1978), in which the supporting structure of the bar is mobile in the guide of the main body of the machining tool, this movement being carried out from the movement of the working cylinder rod. After the support structure moves in the direction towards the circular processing surface of the wire brush, the bar in the support structure deviates slightly backward due to the tangential reaction of the rotating wire brush. Due to this reverse deviation, a switch is switched on which switches the distributor of the pressure medium, which prevents further movement of the working cylinder rod. The disadvantage of this solution is relative complexity and, consequently, increased production costs. In addition, the working cylinder presses the bar to the exact circular machining surface, which requires increased energy demand. At the same time, the flexibility of the pressure medium does not guarantee sufficient accuracy of the geometry under Very circumferential surface processing a wire brush

In the proposed equipment, the rod of the working cylinder is attached to the duplex0

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to which the balancer, one shoulder of which is connected by a pawl with gearing to the teeth, corrected in the main body of the machining tool, and a spring attached to the other shoulder of the balancer, which is fixed by anchors to the console of the bearing structure of the grinding tool. The spring is secured by anchors to the set screw, which is fixed in the console of the bearing structure of the grinding tool.

The effect of the invention is that the working cylinder only moves the bearing structure of the sharpening tool and deflects the balance bar to the locked position, and the force reaction of pressing the sharpening tool during sharpening delays the mechanism of the paw and teeth. This solution is simple and reliable and guarantees the required accuracy of the geometry of the machined circular machining surface of the machining tool. To move the bearing structure of the sharpening tool and tilt the balance bar, you can use a working cylinder with low energy consumption. The adjusting screw easily adjusts the desired spring preload.

The drawing shows schematically the proposed equipment, a longitudinal section.

The processing tool 1 is located in the main body 2, which is fixed to the frame of the processing machine. The machining tool 1 is a circular wire brush that is attached to the shaft 21, which is located in the main body 2 and is equipped with a chain sprocket 22. The latter is connected to the drive mechanism B of the guide 23 of the main body 2 the bearing tool 3 is movably mounted. 31 is a prism-like bar which is located in the sleeve 32 fixed in the supporting structure 3. The sleeve 32 is provided with a terminal engagement 33 for securing the grinding tool 31 in the set nnom position. In the main body 2, the working cylinder 4 is pivotally fixed with a plunger 41 and a stem 42 for inclining it, which is attached to the balance bar 5. The latter is located in the supporting structure 3 on the axle 34, and one of its arms is provided with a pawl 51, which is engaged with the teeth 24 , corrected in the guide 23 of the main body 2. On the other

the end of the balancer 5 is fixed spring 52, which is fixed by anchors to the installation screw 53, which is screwed into the console 35 and fixed by nuts 54. The console 35 is fixed to the supporting structure 3.

In the initial position, the rod 42 is introduced from the working cylinder 4 into the dead point. The bearing structure 3 and the grinding tool 31 are mounted in the guide 23 of the main body 2 above the machining tool 1. The dog 51 of the balance bar 5 is out of engagement with the teeth 24. In the case of sharpening, the distributor which supplies the pressure medium to the plunger 41 is switched. working cylinder 4.

The preload of the spring 52 is adjusted by the adjusting screw 53 so that its force value during movement of the supporting structure 3 is higher than the resistance value of the friction. Thus, during movement of the rod 42, the pawl 51 of the balancer 5 remains out of engagement with the teeth 24, and the carrier 3 moves until the grinding body 23 of the main body 2 until the grinding tool 31 touches the circular machining surface of the processing tool 1, B this moment increases the resistance to movement of the supporting structure 3 in the guide 23 and its value exceeds the value of the pre-stress of the spring 52. The balance bar 5 is rotated by further movement of the rod 42 around the axle 34 rotiv action of the spring 52 and the pawl 51 falls into engagement of the teeth 24 of the guide 23, which corresponds to the length chagti grinding tool 31, protruding from the sleeve 32. Pe0

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Moving the carrier structure 3 with the grinding tool 31 in the guide 23 of the main body 2 is blocked at all times necessary for sharpening the processing tool 1. After sharpening the processing tool, the valve is switched back, the distributor and the pressure medium are brought into the space in front of the plunger 4 1 of the working cylinder 4, thus, the equipment returns to its original position.

The invention can be used to sharpen a machining tool, in particular a circular wire brush, for ruffling the hem of tightened shoes.

Claims (1)

1. Equipment for sharpening a machining tool, especially a circular wire brush for ruffling the pulling edge of a shoe upper workpiece tucked into the shoe, consisting of a grinding tool mounted on the base frame, located in the tool tool body and connected to the working tool stem, characterized by that it has a balance bar connected to the stem of the working cylinder, one shoulder of which carries the pawl, the console is fixed to the bearing frame of the grinding tool, the free end otorrhea and biased by means of anchors connected with another rocker arm, wherein the outer surfaces are corrected barbs for engagement with the pawl. 2 The equipment according to claim 1, in connection with the fact that it has a screw, which is fixed in the console and secured by anchors on the spring.