Guillotine shearing machine, especially for continuous bands, wi

Details Guillotine shearing machine, especially for continuous bands, wi Guillotine shearing machine, especially for continuous bands, wi

1989-04-14

1991-08-27

Watts, Douglas D.

Cutting

Cutting motion of tool has component in direction of moving...

Orbital motion of cutting blade

83345, 83337, B23D 2508

Patent

active

050423444

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The so-named guillotine shearing machine is a well-known tool. One blade, generally the upper one, is mobile and slides on runners which keep the movement rectilinear and transversal to the cutting plane. The blade is operated by cams or by hydraulic systems. Shearing machines used for cutting lengths of sheet metal, profiles, continuous moving bands, comprise a pair of drums between which the band passes, and radially set blades which meet at the shearing plane to cut through the moving piece.
The radial position of the blades obviously determines the angle they assume, which angle varies progressively during cutting. This means that the advantages of speed and simplicity in continuously cutting a moving band are to some extent adversely affected and the operation lacks that precision which can only be obtained with blades set perfectly perpendicular to the piece to be cut. The invention here described avoids these drawbacks at the same time offering considerable advantages as will now be explained.


SUMMARY OF THE INVENTION

Subject of the invention is a guillotine shearing machine, especially one for cutting continuous metal bands, wherein the opposing longitudinal blades translate parallel one to another along equal circular trajectories with parallel axes of rotation lying on the same geometrical plane. Blade movement is reciprocally synchronized. The phases in movement of one blade in relation to the other are such that one blade meets the other close to the shearing plane becoming progressively superimposed to make the cut.
The start of each cutting cycle, corresponding to a 360.degree. rotation of the blades, is controlled in relation to certain speeds at which the band, or any other piece to be cut, and the blades move during the cycle, and at the most suitable instant for cutting off the desired length of the band.
Blade speed is adjusted according to that of the band to be cut in such a way that, when the cut is made, the speed of the cutting edge practically coincides with that of band movement. The blade is moved by means of a double pair of cranks for each of the two blades, one pair being situated at each end of the blade. The two cranks in each pair are connected by sprocket wheels with an idling sprocket wheel in between them.
The pairs of cranks at each end of the blade are connected by a longitudinal shaft to ensure synchronized movement, preferably by pairs of gears.
The drive shaft is preferably fixed to the upper crank of the lower blade, connected to the lower crank of the upper blade by a pair of sprocket wheels.
Synchronizing shafts between the pairs of cranks for each blade are respectively connected, by means of gears, to the sprocket wheel fixed to the upper crank of the lower blade, and to the sprocket wheel fixed to the lower crank of the upper blade.
Each blade is fixed at either end to two connecting rods respectively connected to the cranks forming either of the pairs that support each of the above blades at both ends.
The connecting rods of the upper blade support an elastic presser acting over the whole width of the translating band, at the moment when the blades meet, accompanying their movement and at the same time stabilizing their vertical position to hold the band relatively steady in relation to the blades that make the cut.
At the beginning of the cut, said elastic presser is in contraposition to a support of the band fixed to the lower blade close to the cutting edge. Therefore, close to the cut and while it is being made, said support causes that part of the band as yet uncut to be raised to the progressive level of the lower blade where it remains until completion of the cut extending from one longitudinal edge of the band to the other. In so raising the band by means of the support fixed to the lower blade, speed of the band and of the cutting edge of the lower blade round its circular trajectory are kept practically equal until completion of the cut.
The start of each shearing cycle to cut off the desired length of band, in each c

REFERENCES:
patent: 1913153 (1933-06-01), De Salardi
patent: 1988215 (1935-01-01), Peterson
patent: 2336957 (1943-12-01), Pierce
patent: 3869948 (1975-03-01), Rau
patent: 4218944 (1980-08-01), Sclippa
patent: 4691603 (1987-09-01), Winnemoller

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