Needle thread-break monitor for embroidery machines

Details Needle thread-break monitor for embroidery machines Needle thread-break monitor for embroidery machines

1984-03-16

1986-04-15

Envall, Jr., Roy N.

Electricity: circuit makers and breakers

Special application

Running length, web or strand actuated

112278, 139354, 340677, H01H 316

Patent

active

045829683

ABSTRACT:
The needle thread-break monitor for embroidery machines comprises a double-armed rocking lever acting as a switch in an electrical circuit of an alarm system. The rocking lever is mounted on a bearing shaft forming one pole or terminal of the switch. The other pole or terminal of the switch is formed by a limit or abutment shaft arranged substantially vertically above and extending substantially parallel to the bearing shaft. The arm of the rocking lever not having a thread guide cooperates with the limit shaft, which carries a sleeve of electrically insulating material forming a stop limiting the open position of the switch. The arm of the rocking lever having a thread guide cooperates with the sleeve. The sleeve is rotatable between a terminal or limit position on the terminal or limit shaft enabling electrical contact and another limit position inhibiting electrical contact. The sleeve serves as a support for a needle thread in the relaxed or non-tensioned state. These measures permit the design of a simple yet reliable needle thread-break monitor which fulfills all requirements.

REFERENCES:
patent: 2569475 (1951-10-01), Klein
patent: 2696608 (1954-12-01), Hangartner

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