Tool changing – Tool transfer to or from matrix – Indexing matrix
Patent
1994-09-27
1995-12-19
Briggs, William
Tool changing
Tool transfer to or from matrix
Indexing matrix
211 156, B23Q 3157
Patent
active
054764360
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a chain magazine for receiving of machining tools for machining devices, in particular, tooling machines. Chain magazines of this kind comprise essentially a continuous chain with tool holders and at least two sprocket wheels as well as guide elements for the chain links following to the reference circle diameter of the guide sprocket wheel.
Such chain magazines are known, for example, from the German Printed Patent Document DE-OS 2,000,779. The hinges connecting the chain links are formed of hollow cylindrical shape in the chain magazine shown in the German Printed Patent Document DE-OS 2,000,779 and the hinges are formed as tool holders. This is associated with the consequence that the tools can only be inserted or, respectively, withdrawn in the direction of the hinge axes of the hollow cylinders connecting the chain links.
The last recited disadvantage is avoided in a chain magazine known from the German Printed Patent Document DE-OS 2,525,212 A1. The tool holders are disposed at chain link plates according to the German Printed Patent Document DE-OS 2,525,212 A1, which chain link plates are hingedly connected to each other by receiving free chain link plates. The center link plates of the tool holders therefore describe path curves, where the path curves exhibit a substantial distance from the path curves of the link pins. Because of the free intermediate chain link plates, the receiving capacity is limited to half of the chain links present. In particular, it is a disadvantage in this context that high torques occur, in particular, upon a start-up and braking because of the distance of the path of motion of the tools from the curve of the path of the chain proper, which situation should be avoided.
The German Printed Patent Document DE 3,431,091 C2shows a magazine of this kind, where each chain link plate is furnished centered between the link pins with a tool holder. While according to this, the path of motion of the axes of the tool holders is placed closer to the path curve of the chain, there remains nevertheless still a disadvantageous distance causing torques associated with the individual motion of the tools.
Therefore, the object is to provide such a chain magazine for machining devices, where the axes of the tool holders run precisely in the curve of the path of the chain, and which allows the discharge of the tools in a direction perpendicular to the axes of the tools or, respectively, of the tool holders.
The solution according to the invention is associated with the following features starting with a chain magazine of the recited kind: different diameters connected at two ends of the connecting bar to the connecting bar and forming the chain hinges, axes (Z) in the mutually encircling tubular sleeves under a small motion clearance, as well as exhibit parallel faces disposed spaced apart and directed toward the center axes of the holder devices, wherein the tubular sleeves form an open insertion channel or, respectively, removal channel in the respective insertion position or, respectively, removal position of the chain hinge.
The idea on which the invention is based starts with the consideration that large acceleration forces acting on the chain links and on the tools inserted in the holder devices are to be avoided. These forces and torques occur in particular based on jumps in acceleration upon the transition from a straight into a curved path section of the chain transport and vice versa, and these forces and torques increase with a square dependence in case of an increased transport speed. Therefore, it is advantageous if the axis of the tool coincides with the axis of the chain hinge. If the hinge axis of the chain does not coincide with the path of motion of the tools, then very high acceleration forces and torques occur, in particular in case of high transport speeds and very high acceleration forces and torques cause premature wear of the chain or of the holder device.
It is furthermore advantageous that the tool and chain hinge axes coincide because a den
REFERENCES:
patent: 3541677 (1970-11-01), Fiegler
patent: 3591920 (1971-07-01), Branard et al.
patent: 4182021 (1980-01-01), Kato et al.
Briggs William
Kasper Horst M.
Kopp Werkzeugmaschinen GmbH
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