Method for producing the latch bearing in a latch needle for textile machines
AssigneeTheodor Groz & Sohne & Ernst Beckert Nadelfabrik Commandit-Gesellschaft
InventorHardo Berentzen
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Abstract
A method for producing the latch bearing in a latch needle for textile machines of the type in which a latch is pivotably mounted in a longitudinal slot between two cheeks of a needle shank by a hinge pin passing through mutually aligned transversely extending bores in at least one of the cheeks and a bearing portion of the latch between the cheeks. In accordance with the method a cylindrical wire is provided with transversely extending notches at intervals corresponding to the length of a hinge pin. The notched wire is converted by hot or cold treatment into a bittle, hard state. Individual hinge pins are broken off from the wire at the notches, and are subsequently inserted into the bores in the cheeks and the bearing portion of the latch to be securely fixed there.
Claims14
A method of producing a latch bearing in a latch needle for textile machines, comprising the steps of:
- providing a partially assembled latch needle having a needle shank and a latch, the shank having a longitudinally extending latch slot and a pair of shank cheeks laterally delimiting the slot and having respective laterally extending axially aligned bores, the latch having at an end thereof a bearing portion, the bearing portion having a bearing bore and being positioned in the slot such that the bearing bore is axially aligned with the bores in the cheeks;
- forming notches in a cylindrical wire, the notches extending transversely of the length of the wire and being spaced along the length of the wire to define respective pieces of the wire between the notches;
- treating the notched wire so as to bring the notched wire to a brittle, hard state by at least one of heating and cooling the notched wire;
- breaking off the pieces of the brittle hard wire at the notches;
- and
- inserting one of the pieces into at least one of the bores in the cheeks and the bearing bore of the partially assembled latch needle to serve as a hinge pin for the latch needle.
Dependencies are inferred from the claim text.