Wireworking – Article making or forming – Electric lamp or electric space discharge device electrode
Patent
1992-09-23
1994-03-01
Larson, Lowell A.
Wireworking
Article making or forming
Electric lamp or electric space discharge device electrode
29 455, B21F 3300
Patent
active
052898539
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for producing all-metal spring cushions from pieces of knitted metal.
All-metal spring cushions were produced hitherto in the following manner: the metal wire is knitted on a circular knitting machine to form a tube, which is then laid flat to form a double-layer band. The latter is provided with a transverse corrugation (goffering). Pieces of pre-determined length are cut from the goffered band and wound up to form a roll. The end of the knitted piece is fixed to the roll by hand by hooking and the knitted roll obtained in this way is pushed by hand into a mould and compressed in a press, the individual wires of the knitted layers coming into close frictional contact with each other and the spring cushion acquiring the respectively desired final geometry.
This type of production is very time-intensive.
The present invention intends to provide an apparatus for the production of all-metal spring cushions, which makes possible a largely automated production without human intervention, in particular renders superfluous the manual insertion of the knitted roll in the mould.
In the production apparatus according to the invention, the winding up of the knitted pieces takes place inside a winding sleeve, which simultaneously serves as an insertion aid for a pressing sleeve. Thus the finished knitted roll can be transferred simply mechanically from the winding station into the pressing station.
In an apparatus according to claim 2, one has a permanently fixed, clearance-free coordination between the inner surface of the winding sleeve and the inner surface of the pressing sleeve. Also one does not require any special and precisely positioning conveying means for moving the winding sleeve between the winding station and pressing station.
An apparatus according to another embodiment has the merits of a particularly simple mechanical construction. In addition, there is no junction between the winding mandrel and pressing mandrel. The press die can be moved simply across the winding mandrel.
The development of the invention according to another embodiment is an advantage with regard to simple driving of the winding mandrel.
In an apparatus according to another embodiment, one can dispense with a counter-electrode inter-wound between the uppermost layers of the knitted roll, since the welding current is guided positively in the radial direction. A counter-electrode of this type makes the mechanical construction of the apparatus more complicated, since it must be removed by a separate drive in the axial direction from the knitted coil, before the latter is compacted.
Too, the development of the invention according to another embodiment serves for fixing the end of the knitted piece to the roll by microwelds, without a counter-electrode inserted in the roll.
With the development of the invention according to another embodiment, on the one hand a particularly simple and easy stripping of the finished knitted roll from the winding mandrel is achieved. In addition, this development makes it easier to push the press die with slight radial clearance over the winding mandrel.
According to another embodiment, gripping means able to be moved out of the winding mandrel can be realised and actuated in a particularly simple manner.
The development of the invention according to another embodiment is an advantage with regard to high throughput of the production apparatus, since the winding and closing of the knitted roll and the pressing can be carried out simultaneously in different, spatially separated working stations.
In an apparatus according to another embodiment, a supply rail, by means of which the knitted piece is supplied to the winding station, can be located in a stationary manner. At the time of movement of the stepping table, it does not need to be moved out of the stepping table path.
In an apparatus according to another embodiment, the same advantage is achieved also for the fixing device, which belongs to the winding station.
In an apparatus according to another embodiment, one a
REFERENCES:
patent: 2334263 (1943-11-01), Hartwell
patent: 4343335 (1982-08-01), Kobayashi et al.
Larson Lowell A.
Philpitt Fred
Stop-choc Schwingungstechnik GmbH & Co KG
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