CS 89 Need to be reset after every wedge

[Evgeny]

Good day everyone!
I got an old CS89 with broken pedal and tubing. I fixed pedal and tubing, and now it is working, but not completely as it should. I need to reset it with red emergency stop button after every wedge i push into a molding, otherwise it does not activates second time.
When i push loose red emergency stop button it releases a bit of compressed air and it works again, but only once.
Appreciate your advice how to fix.
Thanks a lot
Evgeny