Glass manufacturing – Processes – Severing of molten glass stream
Reexamination Certificate
1996-03-07
2001-09-18
Colaianni, Michael P. (Department: 1731)
Glass manufacturing
Processes
Severing of molten glass stream
C065S174000, C065S176000, C065S207000, C065S221000, C065S325000, C065S332000, C065S334000, C083S564000, C083S600000, C083S602000
Reexamination Certificate
active
06289696
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an apparatus for the serving of gobs from one or more strands of molten glass by a shear blade pair.
In one known apparatus of this type (DE 41 32 098 C1) the pivot movements of the two shear arms are synchronised with one another by a gear mechanism. The pivot movements are effected by the driving of only a first of the shear arms by a drive mechanism. The drive mechanism comprises a crank whose crank pin is connected by means of a coupling rod to the first shear arm. The drive means is arranged on a carriage which is displaceable transversely to a longitudinal dimension of the first shear arm. The gear mechanism is comparatively expensive. Much space is demanded to one side of a plane of symmetry of the shear arms by the drive mechanism and its carriage together with carriage guide brackets. Generally, the shear arm which is not directly driven is biased by a pneumatic piston-cylinder unit.
From WO 94/01371 A1 there is known a parallel shears of a different species. Here, each shear blade is fixed to a carriage. The carriages are drivable linearly back and forth by a common crank drive mechanism. The crank drive mechanism comprises a crankshaft and diametrically opposed connecting rods which are coupled to the crankshaft and which are each coupled at the other end to one of the carriages.
From DE 43 16 842 A1 there is known a pivot shears wherein the two shear arms are pivotally mounted on different axes. A common rack is guided for movement back and forth transversely to the shear arms by means of a hydraulic drive. In engagement with the toothed rack is a pinion with which two driven gearwheels of a gear transmission mesh. To each driven gearwheel is fixed a connecting member which carries a first intermediate link member. A second intermediate link member is coupled to each first intermediate link member and to one of the shear arms.
It is the object of the invention to simplify the apparatus and to improve the kinematics of the cutting movements.
SUMMARY OF THE INVENTION
This object is achieved by the present invention. By virtue of the coaxial mounting of the two shear arms, the spacing between the two bearing shafts in the known coupling gear mechanism between the shear arms is removed. Tolerances and play which occur in the known coupling gear mechanism are excluded. The kinematics of the cutting movements are improved, since both shear arms now pivot about the same axis. The individual drives for the shear arms mean that each drive can be made smaller and lighter and can be more easily fitted.
Each electric servodrive can comprise, in addition to an electric servomotor, a subsequent gear mechanism as required. Both electric servodrives are preferably controllable synchronously by means of a freely programmable electronic control. In order to synchronise the apparatus the electric servodrives can be brought to a standstill in an opened working position for a synchronisation period. The synchronisation period can be made very short.
At least one carriage brings about the particular advantage that one can keep the working stroke of the shear arms to a minimum and consequently reduce driving energy on the one hand and increase the maximum possible operating speed on the other hand. For the rest, the carriage permits a very simple and rapid opening of the shear arms out beyond the opened working position relevant for the working stroke. This further opening is desirable for example if maintenance or exchange of parts has to be carried out on the orifice ring of the feeder bowl. The orifice ring and its surroundings can thus be made freely accessible in a rapid and simple way for servicing purposes. An opening of the shear arms can also take place automatically in the case of a loss of the drive or the driving energy. In this case, the control of the drive means generates a starting pulse for a further control for the reverse driving of the carriage. The shear arms then remain in a opened safety position until the damage to the drive means is repaired or the energy supply is restored. In this way, the shear blades cannot collide with the glass strands.
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patent: 4132098 (1991-09-01), None
patent: 4316842 (1993-05-01), None
patent: 1435548 (1988-11-01), None
patent: WO9401371 (1994-01-01), None
Bogert Hermann
Geisel Gerhard
Colaianni Michael P.
Synnestvedt & Lechner LLP
The Firm Herman Heye
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