Foot Pedal Chain, Linkage Problem

Hello all,

I’m having issues with the foot pedal. A screw on the underside of the bumper fell to the floor causing the carriage not to go all the way back to the inking drum unless we pushed the spring back. It seems like there is too much slack in the chain and nothing is lifting the foot pedal off the floor. Whatever links the foot pedal to the bumper seems to be not working. After putting the screw back in, I pushed the carriage back to the inking drum and it is now making a popping noise when it gets back to the inking drum position.

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Paul Moxon, Moderator
7 years ago

Tap out with a pin punch from the narrow end. Take the pieces with you to a hardware store or a nut and bolts store. Don’t bother going to a big box (Home Depot of Lowes).

Paul Moxon, Moderator
7 years ago

There should still be tension in the linkage from the pedal to the “bumper” regardless of the position of the carriage.
A few places in the linkage to check include:
– the two taper pins on the shaft connected to the pedal are not broken. There is one on either side of the cabinet legs.
– the chain may have has stretched enough to now be noticeable. Examine the yoke connecting the chain to the arm inside the cabinet at the foot.
– the spring toward the end of the linkage could have become broken or disconnected. However, the only way to fix this is to remove the bed from the cabinet. This requires removing the carriage and lifting the bed casting with a hoist.

The popping noise it probably the paper gripper stems automatically raising just before the carriage returns to the feed board and then snapping closed as the carriage comes to rest. This action happens when the gripper latch (MS-127) is allowed to slide and is not locked down. The latch can be locked back against its spring by tightening the hex head bolt on the latch. However, before doing this loosen the small set screw on the underside of the assembly to allow the hex bolt to sufficiently turn, otherwise, the bolt will break.

Paul Moxon, Moderator
7 years ago

Photos will help. It’s not clear what you mean by “bumper.” I think you may be referring to the block that contacts the cam (MS-129) on the gripper trip latch. See Sheet 107 of the manual.

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