John Bianchi's Leather Stitcher

[Art]

Esentially yes, but the version they were making 20 years ago.

Art

Thanks Art.

Would that be the "DC60" ? as found here: http://www.efka.net/...ile-EN-DC60.htm (control box exploded diagram shown)

[Northmount]

1339460109[/url]' post='252199']

Or do you think heel down is just applying the brake?

Logically, heel down AND needle down would release clutch (applying brake).

Heel down would continue sewing until the above are both satisfied (logical AND).

He also has a link to lift the presser foot.

This is not difficult to do completely mechanically. Just using mechanical rods, levers, bellcrank and cam. Predates fancy electronic positioning. Chances are you could search and find the patent for the system.

Edited June 12, 2012 by northmount

[mogwild]

Cool. Learn something new everyday. Time to chew up some leather and practice practice practice with the clutch motor.

[Trox]

I want say it is new and fancy, my oldest position system is an Efka variostop, it is about 30 years old. It is an electronic clutch motor, with an electronic brake. It is build like a tank. I also have a modern Efka DC position motor. The latest motor systems from Efka; Dc 1550 is a very strong mini servo. It will propel the 441 with no use for a speed reducer. Here it is in use on the new big Adler 120 (the control box is not in the picture) Look at the motors on Keystone; http://store.keysew.com/parts/industrial-sewing-machine-motors.

Trox

[MattW]

John Bianchi uses his Ferdco for some work and his new Cobra Class 4 for other work.

The motor on the Ferdco is an Efka. not positive on the model.

The Cobra Class 4 has a NPS servo motor.

AFAIK, all NPS systems have a synchronizer that attaches to the main shaft near the hand wheel.

Heel down on the pedal raises the needle out of the work. If you take your foot off the gas the machine will stop with the needle down, just after the shuttle hook has caught the loop. This enables tight turns without any skipped stitches.

The needle positioner motors are a godsend. It greatly speeds up difficult stitching.

Both the Ferdco and the Cobra John uses have needle positioner motors. The new motors offered by Leather Machine Shop are much less expensive than the older NPS motors and give you the same results. (The ability to control the top speed. Stop the stitch in either needle up or down position.

I hope this helps clear up any remaining questions about what John's machines are.

If not let me know!

The picture is of the motor on John's Ferdco.

Matt Whitaker

General Manager

Frontier Gunleather

[mogwild]

Matt,

Thank you very much. That is exactly what I was wondering.

Many thanks.

-trev

[Cobra Steve]

Thanks, Matt for your insight. Steve

[mogwild]

Just got back from a friends house, tried out his Cobra 4 with Servo motor, have to say, that's a sweet machine!

[Anne Bonnys Locker]

You don't know what control is until you have used a treadle.

[amuckart]

Darren,

Any tips on how to manage that? I've found treadles are great but for slow speed stuff they're no patch on a servo because they need some good momentum to keep going and have penetration power.

Cheers.