Severing by tearing or breaking – Breaking or tearing apparatus – Plural breakers
Patent
1980-08-19
1982-09-07
Yost, Frank T.
Severing by tearing or breaking
Breaking or tearing apparatus
Plural breakers
83345, 83923, 225 4, 225100, 225106, B26F 302, B26D 162
Patent
active
043479596
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for dividing strip material, said apparatus comprising at least one pair of mutually co-operating cutters between which said strip material is continuously advanced and which are arranged to penetrate said material on respective opposite sides thereof. The apparatus is particularly, although not exclusively, intended for use when collecting scrap formed while edge-trimming rolled strip and metal sheet.
It is previously known that handling of scrap formed when edge-trimming rolled strip and metal sheet can be facilitated by dividing or "chewing" the long strips formed during said edge-trimming operation, thereby to reduce the volume of the scrap. To this end there is normally used radial-type chewers which have at least one stationary cutter and at least two movable cutters which are mounted on a rotatable roller. The strip to be divided is fed radially in towards the rotating roller, severing of the strip occurring between a movable cutter and the fixed cutter when said movable cutter passes by the fixed cutter, which is located adjacent the movement path of the movable cutter. The disadvantages with these prior art chewers is that their capacity is not sufficiently high to enable the chewers to cope with all the scrap formed in modern metal-strip or metal-sheet mills, when these operate at their maximum speed or at a speed near said maximum. Because of the low capacity of known chewers, the rolling speed of the rolling mill must be maintained at 30-50% beneath their maximum roll speed, which greatly decreases the production rate. It is also known to use chewers which comprise two rotatable rolls and steel cutters mounted thereon. In these chewers the cutters must be ground to special requirements and be very precise in order for the chewers to operate satisfactorily. This results in high maintenance costs. The cutters of these chewers rotate at mutually the same peripheral velocities.
Further, the conventional chewers are extremely noisy, which is a great disadvantage to those persons working in the rolling mill. Although sound-dampening covers can be placed over the chewers, this can normally only be done with great difficulty, since they must be placed beneath the strip or plate, close to the cutting location, where available space is very limited.
The main object of the invention is to provide an apparatus for dividing strip material, particularly for dividing up scrap formed when edge-trimming metal strip and metal sheet, which is able to operate at high speeds and which is considerably quieter than previously known apparatuses.
This object is achieved with an apparatus according to the invention which comprises at least one pair of mutually co-operating cutters, between which the strip material is fed and which are arranged to penetrate the material from mutually opposite sides, the apparatus being characterized in that the two cutters in each pair are mutually substantially parallel at the moment of their penetration into the strip material, and that the one cutter in each pair is arranged to engage the strip material slightly in front of the second cutter as seen in the direction movement of the strip material, and then to move away from the second cutter in the direction of movement of the strip material, such that the part of strip material located in front of the cutters is separated from the remainder of the strip by a combined cutting and tearing action.
Because, in accordance with the invention, at least one cutter moves substantially in the direction of movement of the strip material, the strip feed is facilitated to such an extent that a higher working speed, and therewith a higher capacity, can be reached than was possible with the previously known devices. This increase in capacity is particularly high in those cases when both cutters in the co-operating pair of cutters move substantially in the direction of movement of the strip material, whereby feeding of the material to be chopped up or divided is considerably facilitated. Because one cutt
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Granges Aluminium AB
Yost Frank T.
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