Apparatus for detecting amount of leftover lower thread in a sew

Details Apparatus for detecting amount of leftover lower thread in a sew Apparatus for detecting amount of leftover lower thread in a sew

1993-06-08

1994-06-21

Nerbun, Peter

Sewing

Elements

Thread sensing

D05B 6936

Patent

active

053220285

ABSTRACT:
A sewing machine is disclosed in which an expenditure of lower thread is calculated from an expenditure of an upper thread. The expenditure of the upper thread is determined from the amount of rotation of a rotary tension disc. A pair of Hall elements deliver two phase signals, a phase difference therebetween is utilized to determine the direction of rotation, thus removing the likelihood of an error being caused by a rotation in the reverse direction. When the amount of leftover lower thread reduces below a given value, an alarm is issued. Where a plurality of needles are used, an expenditure of an upper thread is obtained for each tension disc, and the total expenditure is obtained.

REFERENCES:
patent: 4192243 (1980-03-01), Blessing
patent: 4196685 (1980-04-01), Tamura
patent: 4691648 (1987-09-01), Hirose
patent: 4991528 (1991-02-01), Bellio
patent: 5161475 (1992-11-01), Tawara et al.

Affiliated with

Also associated with

Rating

Apparatus for detecting amount of leftover lower thread in a sew does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for detecting amount of leftover lower thread in a sew, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for detecting amount of leftover lower thread in a sew will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2215174