Metal working – Plural diverse manufacturing apparatus including means for... – Binding or covering and cutting
Reexamination Certificate
1999-09-07
2001-04-24
Briggs, William (Department: 3722)
Metal working
Plural diverse manufacturing apparatus including means for...
Binding or covering and cutting
C198S345300, C269S309000, C279S133000, C279S156000, C409S225000
Reexamination Certificate
active
06219893
ABSTRACT:
SPECIFICATION
The invention relates to a coupling, provided at the spindle head of a machine tool, for clamping an especially plate-shaped work-holding fixture, for example a pallet, in a specified, repeatable and precise position relative to a spatial reference system, wherein the spindle head exhibits a collet, which can be moved axially and radially with respect to its face.
The collet usually serves to grasp a workpiece, which is to be machined by an automatic lathe, a milling machine or the like. Said workpiece is tightened by the collet, for example in an internal cone, provided at the spindle head, for the purpose of positioning. However, the internal cone does not constitute a sufficiently accurate reference for the purpose of numerically controlling an automatic lathe so that sufficiently accurate, uniform and automatic machining of a large number of workpieces to be machined in succession is difficult.
Therefore, the invention is based on the problem of increasing the accuracy of machining the workpiece in a machine tool, as described above.
For the aforementioned coupling, according to the invention, there is also a plate, which is to be connected to the face and is provided with spatial references on the front side. Said plate has a central passage opening to receive a tension rod, connected to the backside of the work-holding fixture, and a bolt, whose rear end can be connected to the collet and whose front end can be coupled with the tension rod. The coupling of the invention leads to significantly higher accuracy of the automatic, numerically controlled machining of the workpiece, is not limited to use with a specific clamping system and finally allows the user the simple transition to known couplings, for example, according to the ISO standard, through removal of the plate and the bolt in the case that there are still machining problems to be solved whose accuracy allows work with couplings according to the ISO standard.
In a preferred embodiment of the invention the bolt can be guided axially in the plate. Furthermore, it is recommended to provide at the front end of the bolt a ball lock, which interacts with the profile on the tension rod. For the connection of the rear end of the bolt with the collet it is recommended that either the end is screwed together with the collet or the end is coupled with the collet by means of a ball rim, engaging with a bolt profile. A good guide of the bolt during the collet movements is obtained, when a hollow cone, into whose axial passage borehole the bolt is guided, is fastened advantageously on the rear side of the plate. Furthermore, it is recommended that to increase the tension force there is at least one axially acting spring, which is braced against the plate and which rests against the bolt.
Other preferred embodiments of the invention are disclosed in the dependent claims.
The invention is explained in detail in the following with reference to the embodiment illustrated in the attached drawings. This embodiment uses an x, y, z orthogonal system as the spatial reference system.
FIG. 1
is a diagrammatic axial view of the coupling of the invention with a clamped work-holding fixture and with the alternative possibility of a coupling between bolt and collet. Said possibility is indicated by the dash-dotted line.
FIG. 2
is a drawing similar to
FIG. 1
with the work-holding fixture detached from the spindle head.
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patent: 5222285 (1993-06-01), Horikawa
patent: 5326114 (1994-07-01), Piotrowski et al.
patent: 5743687 (1998-04-01), Ribic et al.
patent: 5771752 (1998-06-01), Bissett
patent: 5885039 (1999-03-01), Boisvert
patent: 6073325 (2000-06-01), Stark
patent: 198 09 689 A1 (1999-09-01), None
patent: 0 169 543 A2 (1986-01-01), None
patent: 0 175 902 A1 (1986-04-01), None
patent: 97/18918 (1997-05-01), None
Briggs William
Jacobson Price Holman & Stern PLLC
System 3R International AB
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