Tieup Unit , right Treadle
Scroll down to see various views, description of operation and comments about the tieup-unit.
Here is the Tieup-Unit as it appears on the right treadle with the treadle removed from the loom. The left side of the photo is the forward end of the treadle where the right foot rests.
This is a view from the front with the right-foot rest seen at the bottom of the picture. The right-foot rest is in the "forward" position as when the right treadle is up in the resting position.
The purpose of having the right foot forward (we will call it heel forward as in the J-Comp literature) is two-fold: first, it depresses a 'button' on the treadle which signals the loom that the right treadle is in the resting position ready for the next lift; second, it holds in what are called the "clamp", inward (see the next picture below).
The "clamp" is the two outermost parts in this picture, on each side, each with a pulley. Here we see the clamp "in". When the clamp is in the solenoids are held in the actuated position and all shafts are engaged with the lifting mechanism. If you were to treadle the loom in this position (you can't because the heel is forward and on a rest that prevents downward movement) you would lift all the shafts.
To the left, the heel is forward and the clamp is in. To the right, the heel is back and the clamp is out.
With the clamp out the solenoids are released to their de-energized position, and they disengage the mechanisms that lift the shafts. If you depress the right treadle without signaling a solenoid to engage, no shafts will lift.
To the left, a view from the back with the clamp in.
To the right, a view from the back with the clamp out.
The brass squares at the top are holding the pins that engage the shafts when either the clamp is in or the clamp is out and their respective solenoid is energized.
If you look closely in the right picture you can see a long spring, extending from the bottom, up through a solenoid shaft, and going through the brass square holding those engaging pins. That is how the solenoid engages shafts to be lifted, and provides a return spring to disengage the solenoid when it is deenergized.
Now let's look at how all these pulleys work. Both pictures (L & R) with heel forward.
Notice that the horizontal brass rod has four cable ends attached to it: two for each end of the cable going up to the pulleys that face the back of the unit, which go to the back end of the clamp; two for each end of the cable going around the pulleys facing sideways which go the the front end of the clamp.
To the left is heel forward and the brass rod is in the lower position which pulls the cables downward which pulls the clamp inward.
To the right is heel back, the brass rod is upward and the cables release the clamp to go outward.
Back end view. Again, to the left is heel forward, clamp in. To the right is heel back, clamp out.
Here we see that the cable coming from the front is going around three pairs of pulleys. As in the front end, it is a loop of the single cable. The cable is pulling equally on the clamp arms which float/slide on the brass cross rod. As the heel goes back, it feeds the cable towards this end allowing the springs on the clamp arms to push them outward.
The clamp arms have a nylon block in them which rides on the brass rod. Lubrication should not be necessary, but things must be kept clean and free of lint for the clamp arms to move freely and equally.
The cable for the front side goes around four pulleys, two facing you and one on each clamp arm. This cable forms a loop around the pulleys on the clamp arms such that when the heel goes back and the brass rod goes up, it allows the clamp arms to move outward.
Here you can see the nylon blocks in the clamp arms that ride on another brass rod, going crossways (partially hidden by the pulley mounts). As the cable is let out springs on the clamp arms push them outward. Lubrication is not necessary, but things need to be kept clean so the clamp arms go outward evenly.
Here is a view looking down the top into where the actuator rods engage the arms coming down from the lams, and a picture of one of the rod units removed from this area.
This is the area that needs regular cleaning and lubrication for the tieup unit to work properly and to lift the correct shafts. If you have problems lifting some shafts, start by cleaning and lubricating this area.
With the power off, push the right treadle down (no shafts will lift because no solenoids were energized). Use a good electronic cleaner that won't attack the plastic parts, but will wash away the residue of WD-40. Push a rag between the tieup unit and the treadle to catch the drips. Then wash down thru this opening to clean lint and gummy lubrication out. Finish by a liberal spray of WD-40.
With the treadle down and the clamps out, you can spray a little WD-40 on each of the little pins, pushing them in by hand and releasing them to spread the lubrication.
Notice that the cross arm with the single pulley is actuated by a cable attached to the foot rest.
To finish up, here is a view of the flat bars attached to each lam, shown with the treadle down and no shafts engaged. Those little rods shown above poke through the slotted holes in these bars to engage the lam and pull it down when the treadle goes down.
