Improved apparatus and method for detecting broken pin hole and loom used together

Abstract

A device for detecting broken hooks of knitting needles. A knitting machine has a cam, which includes a needle starting cam, a loop forming cam, and a closing edge cam. A detector has a detector rising section, wherein the second triangular surface in the off-edge triangular portion is inclined away from the second triangular surface at the looping position. A detector butt descending section is followed by a detector butt ascending section, and a concave section is followed by a butt descending section. The concave section is formed such that the second cam surface is sufficiently spaced from the first cam surface so that the butt of a needle with a broken hook is pushed into the concave section by the detector butt descending section, but without damaging the needle The needle butt does not enter the concave section of the detector. A sensor recognizes the end of a needle whose butt is located in the concave section of the detector. The device may further comprise means for stopping the operation of the knitting machine after the sensor has been triggered. A method for detecting a broken hook and a needle for use with said device are also provided.

Description

technical field

[0001] This invention relates to knitting machines, and more particularly to circular knitting machines using latch needles. More specifically, the invention relates to a system for detecting the hooks of knitting needles in a knitting machine when they are broken or otherwise disabled, and for stopping the machine to prevent the formation of fabric defects. Background technique

[0002] In operation of a knitting machine, a knitting needle with a hook at one end reciprocates to pick up the yarn and pull the yarn into loops or various structures to form a knitted fabric. In general, knitting machines can be distinguished into two types: flat knitting machines and circular knitting machines. In these two kinds of knitting machines, all are provided with the device that is used to push knitting needle and do reciprocating motion. For example, in many knitting machines the needles are equipped with one or more butts which extend laterally from the middle of th...

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