Metal working – Plural diverse manufacturing apparatus including means for... – Separate tool stations for selective or successive operation...
Patent
1980-01-29
1983-07-19
Gilden, Leon
Metal working
Plural diverse manufacturing apparatus including means for...
Separate tool stations for selective or successive operation...
29611, 29618, 242 705B, B23P 2200
Patent
active
043935710
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the manufacture of a welding sleeve with an electrical heating conductor in the form of a coil made from an electrical resistance heating wire wound in spaced, juxtaposed turns and embedded in the inner wall of a thermoplastic sleeve member, the turns of the coil being wound on a coil former after which the coil is embedded in the sleeve member.
BACKGROUND OF THE INVENTION
Various constructions of welding sleeves made from a thermoplastic material are known in which the ends of the thermoplastic line elements, i.e. pipe sections, shaped members, terminations and other fittings are interconnected. It is common to all these constructions that the adjacent surfaces of the line elements and the welded sleeve are in part melted and joined with the aid of a heating conductor in which electrical heat is produced.
The production of electrical welding sleeves is relatively complicated, because it is largely dependent thereon whether a satisfactory connection of the ends of the line elements is obtained or not. Welding sleeves in which a coil of an electrical resistance heating wire is arranged in the vicinity of the inner wall of a sleeve member has proved very satisfactory. However, it must be ensured that on the one hand an interturn short-circuit of the resistance heating wire is reliably avoided, a layer of turns in the immediate vicinity of the inner wall is ensured and that on the other hand a reliable connection with the contact points for connecting the electrical welding sleeve to a supply unit is obtained. Although it is possible to fulfil these requirements, manufacture partly takes place by manual operations.
BRIEF DESCRIPTION OF THE INVENTION
An object of the present invention is to so develop a method of the type described hereinbefore that it is possible to completely automatically and rapidly manufacture an electrical welding sleeve, whilst adhering to the above-mentioned quality requirements. The coil must be coilable without waste, i.e. without waste wire pieces being formed.
According to the invention a technique is provided wherein the wire is clamped and held at a first clamping point provided on the coil former, is wound onto the latter by means of a wire guide and after winding is clamped and held at a second clamping point arranged on the coil former, after which the wire is moved up to a cutting station provided on the coil former where it is cut by cutting means. The invention also relates to an apparatus suitable for performing the method according to the invention wherein on both ends of a coil former are provided a first and a second clamp member, so that, PG,4 following the passage of a wire guide arm which is movable with respect to the coil former onto said first clamp member, is moved a first clamping body arranged on a first support movable with respect to the coil former and onto said second clamp member can be moved a second clamping body arranged on a second support movable with respect to the coil former, following the winding of the coil, whilst a separating apparatus having a separating mandrel and a separating sleeve and which is operable by placing on the coil former is fixed to a third movable support.
Finally the invention also covers the use of the apparatus according to the invention in a multi-station injection moulding machine as a station between a station for producing a coil former and a station for the injection moulding of the coil former provided with the coil.
An embodiment of the apparatus according to the invention is shown in the drawings and is described hereinafter with respect to the drawings, wherein
FIG. 1 is a side view of a multi-station injection moulding machine with the apparatus according to the invention;
FIG. 2 is an enlarged top plan view of the portion of FIG. 1 enclosed in rectangle II, in partial section;
FIG. 3 is an enlarged top plan view of the portion of FIG. 1 enclosed in rectangle III, in partial section; and
FIG. 4 is a section along the line IV--IV of FIG. 3.
The invention is based on the consideration
REFERENCES:
patent: 3927456 (1975-12-01), Dammer
patent: 3927843 (1975-12-01), Dammer
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