RU2302321C1 - Apparatus for cutting moving band - Google Patents

Abstract

FIELD: dividing operations at plastic working of metals, possibly cutting off measured-length band pieces in bending-shaping mills.

SUBSTANCE: apparatus includes levers mounted with possibility of rotation in housing at both sides from band moving due to action of drive rollers. Said levers are jointly coupled with cutter holders having grooves where cutter units with cutters are mounted with possibility of translation motion. Levers are mounted on axle. Cutter holders are mounted with possibility of translation motion one relative to other normally to band and they are spring-loaded relative to housing. Wedges are arranged in cavities of each cutter holder with possibility of translation motion. Said wedges are joined with pneumatic cylinders arranged on cutter holders and their wedge surfaces are engaged with cutter units. Cutter units are spring-loaded one relative to other.

EFFECT: simplified design of apparatus, improved quality of band cut.

2 dwg

Description

The invention relates to devices for separating operations of metal forming and can be used for cutting lengths of measured tape in bending-milling mills.

A device for cutting wire is known, comprising installed on the frame on both sides of the wire moving under the influence of the drive rollers and shafts connected to the drive on which the levers are fixed. The levers are pivotally connected to knife holders, in the grooves of which knives are mounted with the possibility of translational relative movement. The knives are mounted on rods mounted rotatably on the eccentric of the eccentric axes. The eccentric axes are mounted with the possibility of relative rotation in the levers coaxially to the axes of their rotation relative to the bed [1].

A disadvantage of the known device is that it needs a drive, and the lack of translational movement of the knives relative to each other reduces the quality of the cut surface.

The invention is aimed at simplifying the device and improving the cut surface of the tape.

Simplification of the device and improvement of the surface of the cut of the tape is achieved by the fact that the device contains levers mounted with relative rotation on the axes in the bed on both sides of the belt moving under the influence of drive rollers, pivotally connected to knife holders, in the grooves of which are mounted with translational relative movement blocks with knives, knife holders are installed with the possibility of translational movement relative to each other perpendicular to the tape and spring-loaded relative tionary frame, and in the cavities of each of the cutter bar with the possibility of translational movement are arranged relative wedges associated with a cutter bar mounted on pneumatic cylinders and contact surfaces of the wedge with knife block, with the cutter blocks are biased relative to each other.

Figure 1 shows a section of the device at the initial moment of the segments. Figure 2 shows a view A.

The device comprises a frame 1, on which axles 2 are fixed on both sides of the moving belt. A lever 3 is mounted on each axis with the possibility of relative rotation, pivotally connected by a finger 4 to the knife holder 5. In the knife holder, the knife block 6 s is mounted with the possibility of translational relative movement perpendicular to the tape knife 7. The knife block has an inclined contact surface with a wedge 8 mounted in the knife holder with the possibility of relative movement in the direction of movement of the tape and connected with the pneumatic cylinder m 9 fixed to the cutter bar. In this case, the knife holders themselves by means of the guides 10 are installed with the possibility of translational movement relative to each other perpendicular to the tape. Knife blocks are spring-loaded relative to each other by springs 11, and knife holders are relative to the bed by springs 12.

The device operates as follows.

In the initial position, the knife holders 5 are pressed by the springs 12 until they stop on the bed. Under the action of pressure in the rod cavity of the pneumatic cylinders, the wedges occupy the most remote position from the cutting plane, and under the action of the springs 11 the knife blocks 6 are opened by an amount sufficient for the free passage of the tape between the knives 7. The tape moves under the action of the drive rollers located at the entrance and exit devices (not shown).

If necessary, pieces of tape in the piston cavity of the pneumatic cylinders create pressure, which leads to the movement of the knife blocks by means of wedges until the knives contact the tape. Under the influence of friction forces arising on the cutting edges of the knives, the knife blocks together with the knife holders move in the direction of movement of the tape, the levers rotate relative to the axes fixed in the bed and move the knife holders and knife blocks perpendicular to the moving tape, which leads to a shift of one part of it relative to the other.

At the end of cutting, pressure is created in the rod cavity of the cylinders, which move the wedges to their original position, the knife blocks open with springs 11, and the knife holders return to their original position with springs 12.

To reduce the magnitude of the cutting force and increase the reaction of the tape to the knives in the direction of its movement, the knives can be made with a chevron line of the cutting edge or with an acute angle of its profile.

Information sources

1. 11 V349 P. Installation for cutting a fast moving wire .: Pat. USA 4640164. Review journal / 14. Engineering Technology / 14B. Technology and equipment of forging and stamping production, No. 11, 1987, p. 51.

Claims (1)

A device for cutting a moving tape, containing levers mounted with relative rotation on the bed on both sides of the belt moving under the influence of drive rollers, pivotally connected to knife holders, in the grooves of which knife blocks with knives are mounted for translational relative movement, characterized in that the levers are mounted on the axis, the knife holders are mounted with the possibility of translational movement relative to each other perpendicular to the tape and spring-loaded relative beds, and in the cavities of each of the knife holders with the possibility of translational relative movement, there are wedges associated with pneumatic cylinders mounted on the knife holders and in contact with the wedge surfaces with knife blocks, while the knife blocks are spring-loaded relative to each other.

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