RU2118237C1 - Unit for closed cutting of rolled material - Google Patents

Abstract

FIELD: closed cutting of such rolled materials as paper, polyethylene film, metal stripe into bands. SUBSTANCE: unit includes two shafts 1, 2 rotating in synchronism in opposite directions. Immobile disk blades 3 and disk blades 4 mobile along shaft are put on shafts. Working edges of blades located on adjacent shaft interact. Mobile and immobile blades alternate on shafts. Unit is supplied with spring-loaded pushers 5 arranged over circumference and intended for simultaneous withdrawal of working edges of mobile blades 4 from proper working edges of immobile blades 3 when mandrels are replaced. Cheeks 9, 10 contacting in process of cutting and providing for necessary stable spacing between immobile blades that is required width of band are put on shafts. EFFECT: alternation of mobile and immobile blades and presence of spring-loaded pushers ensure simplicity of replacement of blade units for different dimensions of cutting. 3 dwg

Description

 The invention relates to devices for gapless cutting of rolled material into strips, such as, for example, paper, plastic film, metal tape.

 It is known from the prior art that for longitudinal backlash-free cutting of roll material, cutting mechanisms with knives rotating in the cutting plane are widespread.

 Known block clearance-free cutting (see ed. St. USSR 1465318, B 26 D 1/24), containing shafts, on one of which are knives, on the other shaft pinch rollers. Between the knives there are rubber gaskets that press the end working planes of the knives to the ends of the rollers. The disadvantage of this device is the inability to quickly replace the knife block, since there is no mechanism for bringing the knives together to enter them between the ends of the pressure rollers. In addition, rubber shock absorbers do not provide a stable tightening of the knives to the ends of the rollers, such as springs can provide.

 Known block clearance-free cutting (see ed. St. USSR N 1541053, B 26 L 1/36) with knives rotating in the cutting plane, containing knives fixed relative to the axis of the shaft located on one shaft, and knives movable along the axis of the shaft located on another shaft. The disadvantage of this device is the low-tech design, accurate selective selective adjustment of the cup cutters is necessary to keep the exact size of the cut (since the cutting elements are fixed on one shaft rigidly relative to the axis, and on the other shaft the cutting elements are movable relative to the axis and brought to the cutting edge by their cutting edge edge of stationary cutting elements). In addition, it is impossible to constructively ensure the cutting of the tape into narrow canvases.

 The objective of the invention is to improve the reliability and quality of cutting by automatically adjusting the knives, ease of replacement of knife blocks with different cutting sizes.

 This invention allows seamlessly and accurately cutting rolled material into strips, while resulting in good cutting quality.

 This device is easy to operate, universal, can be used at different plants for cutting roll material.

 This task is achieved by the fact that the backlash-free cutting unit consists of two shafts rotating synchronously towards each other with knives and knives located on them rotating in the plane of cutting and moving along the axis of the shaft, made to move along the shaft axis under the action of springs. Moreover, the working edges of the movable and fixed knives located on adjacent shafts interact with each other, and the movable and fixed knives are mounted on the shafts alternating. Pushers located on a circle and designed to simultaneously divert the working edges of all moving knives from the mating working edges of the fixed knives when changing mandrels on machines for cutting roll material are introduced into the block. On the shafts there are cheeks in contact during the cutting process and providing the necessary stable step between the fixed knives, i.e. the exact width obtained after cutting the tape.

 The invention is illustrated by drawings, where figure 1 shows a General view of the block clearance-free cutting of rolled material in working condition; figure 2 is a section aa of figure 1; figure 3 - block gapless cutting of roll material with the allotted working edges of the movable knives from stationary when changing mandrels on machines for cutting roll material.

 Block clearance-free cutting of roll material consists of shafts 1, 2. On the shafts alternating disk knives 3 and movable knives 4 are arranged alternately with respect to the axis of the shaft, made to move along the axes of the shafts 1, 2. Moreover, the working edges of the movable knives of the shaft 1 and the fixed knives of the shaft 2 interact, and vice versa. Movable and fixed knives 3, 4 are mounted on shafts 1, 2 alternating.

 In the knife block there are spring-loaded pushers 5, a thrust nut 6 of the rod 7, bushings 8. On the shafts 1, 2 there are cheeks 9, 10 in contact with each other during cutting. To adjust the block to a predetermined cutting size, bushings 11, 12 and a washer 13 are used. The pushers 5 have springs 14.

 To obtain the required cutting size, the strips are installed using the sleeve 11 and the cheek 9, the distance x between the outer edge of the cheek 9 and the edge of the first fixed knife 3 of the shaft 1. Set the distance y between the inner edge of the cheek 10 and the first stationary knife 3 of the shaft 2 with the sleeve 12 and washers 13. The difference in size y - x is the required size of the width of the first strip when cutting. Next, the movable and fixed knives are mounted alternately, through the bushings 8. To obtain a different size, it is necessary to select new bushings 8 and 11 in such a way as to provide new dimensions x and y.

 Using springs 14, the movable knives 4 are pressed against the stationary knives by the working edges 3. The shafts 1 and 2 rotate together with the knives and rods 7, which serve as keys.

 When changing the mandrels on a machine for cutting roll material, the nut 6 is moved to the left, the pushers 5 are pressed, which overcome the resistance of the springs 14 and move the movable knives 4 from the fixed knives 3 (see Fig. 3). Then the mandrel is changed.

 Thus, the alternation of the movable 4 and fixed 3 knives on the shafts 1, 2 allows you to ensure the exact size of the cutting strips.

 Using the springs 14, the knives are pressed during the cutting process.

 This device is universal, easy to operate, reliable in operation, provides high quality cutting.

Claims (1)

 \\\ 1 Block of backlash-free cutting of roll material, consisting of two shafts rotating synchronously towards each other with knives located on them and rotating in the cutting plane fixed with respect to the shaft axis, as well as spring-loaded knives that can be moved along the shaft axis so that their the working edges interact with the working edges of the fixed knives of the adjacent shaft, characterized in that pushers located around the circumference and interacting with the movable knives are movable and not movable knives are mounted on shafts alternating, and the pushers are made to interact with each other, in addition, there are cheeks interacting with each other on the shafts.

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