CNC Sewing machine question

When thread is broken, the operator will replace it, but how can we resume to sewing? We should go back a few steps, i can not figure out how to go back while the needle is designed as an axis?

For the record, this feature is now part of V 2.9 thanks to PhillC

I have seen this video but when going back the needle motor rotates backward which i do not want it to happen.
Should we change needle to spindle mode or is there any way to make zero needle position without rotation?

Ofcourse. I am building a prototype, i am able to sew and cut fabric with co2 laser, but i have faced a problem that i did not think on at the begining. I designed the needle as an axis which made it easy to manage the sewing steps. However when it comes to moving backward or forward, it rotates the needle. So i am confused to change back the needle to spindle.

Since i am new on linuxcnc, your advices are welcome.

andypugh wrote:

In the case where the thread is broken, does it matter if the needle axis moves?

The other option would be for the thread-break detection to report the G-code line where the thread broke (this is fairly easy if it also monitors motion.program-line)
You could then possibly use the run-from-line feature.

I re-checked but unfortunately, i can not move backward needle axis. I must find a way to move back all axes without rotating needle motors. This is the point where i stuck.
I will use a thread sensor to detect the break. I can pause machine when thread broke signal is arrived. However i can not figure out how to go back and use start from here?