# US 4,393,647 A · Snail wire arrangement for yarn breakage detection in ring frames

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- Number: US 4,393,647 A
- Document ID: US4393647A
- Status: Granted
- Kind: A
- Application number: 06/296,424
- Filed: 1981-08-20
- Granted: 1983-07-19
- Earliest claimed: 1980-02-27
- Inventors: Yohji Kitamura
- Web page: https://patentgrep.com/patent/US4393647A

## CPC

- B65H 63/0327: {using piezoelectric sensing means}
- B65H 2701/31: Textiles threads or artificial strands of filaments
- B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES

## Abstract

In order for the snail wire that is to be fitted on a ring-frame for detection of yarn breakage to sense sharply the intrinsical vibration resulting from its contact with yarn, the flat portion of the snail wire where the piezo-electric element is mounted is modified so as to sense the vibration more easily and furthermore, the piezo-electric element and connecting lead are covered and retained with elastic material for protection to thereby ensure the yarn breakage detecting snail wire which can be used stably throughout a long period.

## Claims

### Claim 1

A yarn breakage detecting snail wire arrangement for ring frames and the like comprising:
a lappet;
a holder inserted into said lappet;
a resilient support member;
a snail wire supported, through said resilient support member, by said holder inserted into said lappet so as to contact running spinning yarns for producing inherent vibrations at a side portion of said snail wire; and
a piezo-electric element attached to a portion of said snail wire so as to detect said inherent vibrations for detecting presence of running spinning yarns, said snail wire being formed, at said portion thereof attached to said piezo-electric element along the face portion thereof, into a flat-shaped portion, said flat-shaped portion having a groove formed therein at a side face portion thereof opposite to said face portion attached to said piezo-electric element, and at approximately a central portion of said piezo-electric element in a direction intersecting at right angles with the axial direction of said snail wire so as to form a thin portion in said face portion of said snail wire attached to said piezo-electric element.

### Claim 2 (depends on 1)

A yarn breakage detecting snail wire arrangement as claimed in claim 1, further comprising means for attaching said piezo-electric element mounted on said face portion of said snail wire to the side of the snail wire opposite a direction of advance of said spinning yarns running in contact with said snail wire.

### Claim 3 (depends on 1, 2)

A yarn breakage detecting snail wire arrangement as claimed in claims 1 or 2, further comprising:
a plurality of leads connected to a rear end portion of said piezo-electric element; and
an embedded resilient member for connecting said snail wire and said leads to said rear portion of said piezo-electric member wherein said embedded resilient member further comprises a material softer and more resilient than that of said snail wire resilient support member.