Continuously rotating shears

Details Continuously rotating shears Continuously rotating shears

1999-09-29

2001-08-14

Rada, Rinaldi I. (Department: 3724)

Cutting

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

With means to concurrently adjust flying frequency and...

C083S508200, C083S698510

Reexamination Certificate

active

06272959

ABSTRACT:

FIELD OF THE INVENTION
This invention concerns a continuously rotating shears.
To be more exact, the invention concerns a continuously rotating shears to shear to the desired length on each occasion metallic strip with a thickness of from 0.5 mm to about 5 mm and a width of from 500 mm to more than 1500 mm.
The shears to which the invention refers is suitable to shear strip fed continuously at a speed of advantageously up to around 20 metres per second.
BACKGROUND OF THE INVENTION
The state of the art includes continuously rotating shears of the type as in this invention. The blades of the shears are always in rotation and they are brought to the shearing position at the desired moment by bringing nearer the respective axes of rotation with a parallel displacement.
It is quite clear that in this type of shears there are problems of synchronisation both between the blades and also between the blades and the shearing moment; there are also problems concerning the transmission of power.
If these problems are not properly solved they entail anomalous wear, vibrations, interferences, breakages, incorrect or incomplete shearing, excessive maintenance and a loss of the shearing wire.
An experiment has been carried out in which motion is supplied directly to both the blade-bearing drums.
This experiment also provides that the drums are supported at the respective ends by cams.
The cams of one drum cooperate with the cams of the other drum so as to define the shearing moment on each occasion.
Synchronisation is achieved by means of toothings located at the end of the drums and outside the cams.
When the cams are made to rotate so as to take the blades into the shearing position, the toothings cooperate with each other correctly.
When the cams are made to rotate so as to take the blades into the non-shearing position, while they continue to rotate around their axis, the toothings are distanced and remain connected only through the tips of the teeth and not along the primitive circumference.
The resulting connection is therefore extremely precarious.
A command organ, acting on a pair of cams connected to a drum, drives both the pairs of cams so as to provide, on each occasion, the shearing position.
It is quite evident that this solution known to the state of the art entails discontinuous efforts, uncertain synchronisation, two drive inlets, vibrations, etc.
The present applicant has designed, tested and embodied this invention to overcome the shortcomings of the state of the art and to obtain further advantages.
SUMMARY OF THE INVENTION
According to the invention two blade-bearing drums with parallel axes are provided, as in the state of the art.
Both the drums, at their two ends, have seatings for bearings, associated with an eccentric tube; the axis of rotation of the drums is eccentric by a desired value with respect to the axis of periodical rotation of the eccentric tube.
The eccentric tubes have toothings on the circumference and outside which are always engaged two by two.
All this is known to the state of the art.
According to the invention, the shears has only one drum supplied with motion.
At one end, advantageously at the end opposite the end where motion is supplied, the two drums have a gear or toothing.
According to a variant, the toothing can be included on the side where motion is supplied.
As the axis of the drum rotates around the axis of the eccentric tube due to the effect of the eccentricity of the latter, the toothing is displaced according to an arc of a circle.
As the drum oscillates through the arc of the circle, caused by the eccentric tube, the toothing is always engaged with the inner toothing included in a coordinated rotary tube which in turn has an outer toothing.
The outer toothings of the two rotary tubes are always engaged.
The rotary tubes have an axis of rotation corresponding to the axis of rotation of the cam, so that the cams rotate around the same axis around which the rotary tube is continuously rotating due to the action of the toothing or gear which is solid with each respective drum.
As a consequence, the gear on the respective drum is always correctly engaged with the inner toothing of the respective rotary tube, also when the drums swing in order to carry out the shearing operation.


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