Misc. Yarn winder: convert the existing chain drive to more robust mechanism

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The discussion centers around a malfunctioning electrically powered yarn winder that utilizes a chain mechanism for yarn winding. The main issue is that the chain frequently jumps off the gears, attributed to factors like gear wear, chain stretching, and stress on the yarn holder during yarn feed interruptions. Suggestions for improvement include adding an idler wheel or chain tensioner to maintain proper chain tension, as well as considering the alignment of the machine. Participants also mention the potential for using belts instead of chains, highlighting that belts are often more durable and reliable in similar applications. Overall, the focus is on finding a more robust and reliable method for converting rotary motion to reciprocating linear motion to enhance the yarn winding process.
yarnspinner
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I have an electrically powered yarn winder (that uses the equivalent of a bathroom fan motor) to drive a spindle which holds and turns the yarn cone, and simultaneously drives a chain mechanism which moves the yarn holder parallel to the yarn cone in a back and forth motion along the parallel axis to create a cross winding of the yarn on the cone.

My problem is that the chain often jumps off the gears driving it, either due to wear on the gears, stretching of the chain, or stress on the yarn holder when the yarn feed is interrupted, or the yarn comes under stress from slow feeding (becomes taut).

I am wondering if there is a different, hopefully better, way to convert the rotary motor motion to reciprocating linear motion, in a way that is more robust, by which I mean it is less susceptible to damage and more reliable. It does have to cope with sudden starts and stops.

Hoping for some suggestions here! Thanks in advance.
 
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Before switching to a completely different mechanism, maybe consider adding an idler wheel or chain tensioner sprocket to maintain a proper tension on the chain:

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https://blackaceparts.com/chain-tensioner-idlers
 
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The chain is only one part of the mechanism, the part you notice because it fails.
What size are the two roller-chain sprockets? That sprocket ratio sets the angle of the diagonal yarn on the spool.
 
berkeman said:
Before switching to a completely different mechanism, maybe consider adding an idler wheel or chain tensioner sprocket to maintain a proper tension on the chain:
My first reaction. This isn't a heavy duty machine. Could it be out of alignment?

It's hard to comment about this without more info about your facilities and capabilities and the materials used for the job. Perhaps a photo?
 
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yarnspinner said:
I have an electrically powered yarn winder ...
What is the make and model?
Do you have a picture?
 
yarnspinner said:
more robust
more robust than a chain? ....
...you are driving a hard bargain here :wink:
I think you should ask for repair ideas instead.
With pictures.
 
Belts are frequently used in 'upgrades' of small machine tools. Overhead Cam engines tend to use belts and they last for 70,000miles or more. Amateur machine tools ( mini lathes and mini milling machines) tend to use belt drive and the belts go on and on with heavier loads than winding yarn.
 

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