Pfaff stitch length adjustment post bed

[Oakley]

Hello,

probably one of the specialists can help me. Is there a way to adjust the stitch length at that kind of machine or is it fix? Thank you in advance. Regards

[DrmCa]

Huh, where's the lever?

[dikman]

Has the lever been removed to stop anyone changing the stitch length?

[mikesc]

Maybe that is what the stickers below where the lever ought to be are about.

[Wizcrafts]

Somebody has removed the stitch length/direction lever from the vertical slot above the stickers. You will need to buy a new lever and have it installed in order to change the stitch length or direction.

[Uwe]

Do you know the model number of this machine? It may be an early or transitional Pfaff 571  or Pfaff 474 model where they changed how the stitch length and reverse was controlled (motor controlled bottom wheel drive), and before they got around to changing the casting to remove unused controls.  If that's the case there  is nothing functional behind that black cover plate. You'll would probably the original Efka controller to set the electronic stitch length control.

Here's an example of a Pfaff 474 (the rectangular brown push button in the bed is the reverse button)

I found one other example of your machine, which is apparently a Pfaff 1296 model as it came from the factory. Who knows, it may also have a motorized bottom wheel drive. 

 

 

Edited November 8, 2017 by Uwe

[Constabulary]

Just some thoughts.... I have not seen this particular machine in real life.

Be careful with post bed machines - especially double needle machines. Double needle machines have a fixed needle distance and I´m not sure if gauge sets are available for these machines - maybe on special order and I´m sure they are pricey and you have adjust the position the posts depending on the needle distance (if it is possible at al)l - and they often (not all) have a quite short stitch length because they were used for sewing shoe upper and similar things and these items often just need s hort stitch because of sewing tight curves and so forth. The stitch length often is limited by the throat plate meaning even if you can adjust a  longer stitch you need a throat plate with longer slot to achieve a long stitch length. Question is is a throat plate with a longer slot still available.  If it has a bottom wheel drive you sometimes can only change the stitch length by changing the gears. Some machines have gear groups so you can choose different stitch length but often they have quite short stitch length only like 1.6mm - 2.5mm or so. However - not sure if post bed machines gave these gear groups but I know flat bed machines do. Thats at least my experience...

I would guess your machine is factory set to a certain stitch length. You can probably mount a different stitch length scale with an open face for the stitch length lever but question is if the adjustment unit is present and if it can accommodate the lever at all. If the machine has a plate with sub class number you probably can find out more.

So when buying a used post bed machine you have to consider more criteria compared with a double needle flat bed machine - It can be tricky!

 

 

Edited November 8, 2017 by Constabulary

[Oakley]

Thank you for the help. I don't think that somebody modified the machine. Like Uwe showed, it seems that they produced it like that. If it's possible at all to change the stitch length it seems to be very much work if Constabulary is right. Probably that's not the right machine for me even if the machine itself doesn't seem to be very expensive. A new one like that would for sure cost a small fortune.

[Gregg From Keystone Sewing]

I was looking into this, and Pfaff seems to have at least two pneumatic back tack setups, and maybe more?  

What's the model tag on the back of the arm machine provide say?  Best thing to do is take a picture of the brass plate, there may be a lot of numbers and letters, and post it here.  This is an interesting machine.  

[Gregg From Keystone Sewing]

Here's some images from a machine we have laying around here, this is controlled by pneumatics, but the stitch length is regulated by the stitch length knob.

Cover was removed so we can see working components.

 

 

Edited November 13, 2017 by Gregg From Keystone Sewing