Device for separating one or more strands of molten glass into i

Details Device for separating one or more strands of molten glass into i Device for separating one or more strands of molten glass into i

1994-03-04

1996-05-21

Lacey, David L.

Glass manufacturing

With molten glass charge cutting or scraping means

65207, 65324, 83623, 83628, C03B 710

Patent

active

055185150

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This is a national phase of PCT/EP 93/01610 filed 24 Jun. 1993 and based upon German national application P 42 22 310.5 filed 8 Jul. 1992 under the International Convention.


FIELD OF THE INVENTION

The invention relates to a device for subdividing one or more strands of molten glass into individual glass gobs, the apparatus having a number of shearing blade pairs corresponding to the number of strands to be subdivided. One shearing blade of each shearing blade pair is arranged on one support arm and the other shearing blade of each shearing blade pair is arranged on a second support arm and the support arms are moved towards and away from each other by with a drive unit.


BACKGROUND OF THE INVENTION

Devices known to date of the aforementioned kind are either of a comparatively complicated construction or they do not meet the requirements regarding the simultaneity of movement of the support arms and/or the positioning accuracy of the device components.


OBJECT OF THE INVENTION

It is the object of the invention to provide a device for subdividing one or more strands of molten glass into individual glass gobs, wherein with comparatively simple structure an accurate simultaneous operation of the cooperating device components and a high positioning precision of these components are insured.


SUMMARY OF THE INVENTION

According to the invention this object is achieved in the fact that the drive unit has a bidirectionally operable crankshaft, by means of which two crank pins mutually staggered by 180 degrees can be moved. A first of these pins is operationally connected to the first support arm via a first connecting rod and the second pin is operationally connected via a second connecting rod with the second support arm. With the device design according to the invention for cutting one or more strands of molten glass into individual glass gobs it is insured that both shearing blades of a shearing blade pair can be moved simultaneously with precision, and it is furthermore insured that the shearing blades of a shearing blade pair assume the same position in each cutting sequence. End way it is possible to subdivide a strand of molten glass into gobs of fully identical volume, weight and shape.
Provided that each crankshaft is connected at its remote end with respect to the crank pin with a positioning element moving back and forth with the cranking or swinging motion of the crankshaft, this element being in turn operationally connected with the corresponding support arm, it is insured that the cranking motion of the crankshaft or of the connecting rod is reliably translated in a corresponding stroke of the support arm assigned to the respective connecting rod.
When the positioning element is designed like a connecting strip which can be mounted on a rectilinearly guided rod assembly connected with the corresponding support arm at its remote end with respect to the connecting strip, a precisely rectilinear stroke of the support arm is achieved. By means this rectilinear stroke a constant cutting process of high quality can be insured.
A further improvement of the positioning precision of the support arms and thereby of the shearing blades is achieved when the rod assembly cooperating with the connecting strip has at least two mutually parallel rods mounted with two bearings.
For further enhancement of the positioning accuracy of the device components, in a preferred embodiment of the invention each rod is supported in a first bearing arranged on the side of the connecting strip facing the crankshaft and in a second bearing arranged on the side of the connecting strip facing away from the crankshaft, whereby the distance between the first bearing and the second bearing in the direction of the connecting strip movement is sufficient to allow for each of them the stroke of the connecting strip required during operation and during maintenance.
Provided that both crank pins are arranged on a crank disk arranged nonrotatably and axially nondisplaceable with respect to the

REFERENCES:
patent: 2238283 (1941-04-01), Pearson
patent: 2269553 (1942-01-01), Roessler
patent: 2271271 (1942-01-01), Meyers
patent: 4699643 (1987-10-01), Kulig

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