Machine for forming a Bismarck chain
OwnerJouko Janneinventor
Life of this patent
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Abstract
A machine for forming a Bismarck chain has first and second wire twisting heads alternately feeding and turning two wire helices disposed at an angle of about 90.degree. to each other. The first head adds a first helix of wire as a new link to the last link of the chain, and the second head adds a second helix of wire as a new link to the first helix. The first and second helices are cut after their formation. Thereafter, the chain is pulled upwardly away from the wire twisting heads a distance of two chain lengths. The last length in the chain is held above the wire twisting heads as the wire twisting heads feed and turn two new wire helices.
Claims8
Machine for twisting a Bismarck chain in that the end of a helix formed of silver, gold or equivalent wire is intertwined by rotation crosswise with another helix and the helices thus affixed to each other are cut into pieces of a given length and the attachment of helical pieces is continued in the same manner, the machine comprising two twisting heads (1) each having a pin (4), around which the wire helix (3) can be formed and which has been arranged to be reciprocatingly turnable and to be simultaneously reciprocatingly fed in its axial direction, the two twisting head (1) being arranged to feed periodically in turns and simultaneously to turn two wire helices (3), the twisting heads (1) being positioned at an angle of about 90 degrees with reference to each other in two planes having a mutual vertical distance substantially equal to the inner diameter of the helix turn or slightly less;
- a wire cutting means (18) immediately adjacent to the ends of the feeding pins (4) (C) whereby the termination of the feed motion of the first twisting head starts the feed motion of the second twisting head, and the termination of the feed motion of the second twisting head starts operation of the wire cutting means (13, 21a, 21b), the machine further comprising a chain pulling means (30, 34) grasping the chain and pulling it upwards, and a pair of chain holding jaws (17) extending upwards from the ends of the feeding pins and forming therebetween a space corresponding to the outline configuration of the chain so that the chain can slide therethrough, the lower ends of the chain holding jaws (17) being at such a level (B) that more than two but less than three helix pieces are below that level before operation of the chain pulling means.
A machine for forming a Bismarck chain having a first wire twisting head and a second wire twisting head alternately feeding and turning two wire helices disposed at an angle of about 90.degree. to each other, the first head adding a first helix of wire as a link to the last link of the chain, and the second head adding a second helix of wire as a link to the first helix, and means for cutting the helices formed by the wire twisting heads, wherein theimprovement comprises:
- means for pulling the chain upwardly away from the wire twisting heads a distance of two chain links after each time the wire cutting means cuts the helices;
- and
- means above the wire twisting heads for holding the last link in the chain as the wire twisting heads feed and turn two new wire helices.
Dependencies are inferred from the claim text.