HP Forum Archive 19

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HP-97 printer paper feed cam shaft Message #1 Posted by Ed Sowell on 5 Mar 2010, 7:52 p.m. How are the nylon(?) rollers attached to the shaft? for example, is the nylon roller bonded to the steel, or is it more like a tire that is glued on? Has anyone ever tried replacing them with something?

Re: HP-97 printer paper feed cam shaft Message #2 Posted by Ignazio Cara (Italy) on 6 Mar 2010, 3:59 a.m., in response to message #1 by Ed Sowell Hello Ed, take a look at these pics . I hope this could help you, but if you have any kind of question, please reply here. Regards Ignazio

Re: HP-97 printer paper feed cam shaft Message #3 Posted by Michael de Estrada on 6 Mar 2010, 9:20 a.m., in response to message #2 by Ignazio Cara (Italy) That should be in Geoff's book if it's not already. Are the o-rings the same size as the ones used for the card reader repair?

Re: HP-97 printer paper feed cam shaft Message #4 Posted by Ignazio Cara (Italy) on 6 Mar 2010, 12:34 p.m., in response to message #3 by Michael de Estrada Hello Michael, Sure. I would be very happy if Geoff decided to put this procedure on his book. The o-rings are a little bit more large: they are 8 mm (outer diameter) and 2 mm thickness. I have uploaded some other images here to better describe the procedure. Thanks. Ignazio Edited: 6 Mar 2010, 12:40 p.m.

Re: HP-97 printer paper feed cam shaft Message #5 Posted by Ed Sowell on 8 Mar 2010, 4:48 p.m., in response to message #4 by Ignazio Cara (Italy) Hi Ignazio, Couple questions. First, are the "supports" embedded within the rubber? It looks like they are. Second, how did you get the plastic parts that the rubber is molded to off the shaft? Looks like one would need a thin, strong slotted "collar" of some kind to slip behind the part, then press on the steel shaft using an arbor press. I have found a person who can possibly mold new rubber on if I can get them off the shaft. Ed

Re: HP-97 printer paper feed cam shaft Message #6 Posted by Ignazio Cara (Italy) on 9 Mar 2010, 4:36 a.m., in response to message #5 by Ed Sowell Hi Ed, I hope I understood your questions. To the first, yes, the support is embedded on the rubber. Today evening, when at home, I will upload other more detailed images of the cilinder without the rubber, from diffrent view angle. To the second question, it's very trivial to take apart the cilinder from the shaft. You must push the pin of the shaft against a strong surface, holding the cilinder tightly. I will show the way with a photo as well. I hope to be helpful, for now. Take care Ignazio

Re: HP-97 printer paper feed cam shaft Message #7 Posted by Ed Sowell on 9 Mar 2010, 7:29 p.m., in response to message #6 by Ignazio Cara (Italy) That worked worked. Only problem is the spring jumped out. After much searching I finally found it. Believe it or not, it had jumped into the little box I had been putting my little parts i! I've now sent the wheels off to a person who rebuilds this kind of stuff for turntables and the like. Says he can do it. I'll let you know, probably in a week or two. Thanks for all your help. Ed

Re: HP-97 printer paper feed cam shaft Message #8 Posted by Ed Sowell on 6 Mar 2010, 11:39 a.m., in response to message #2 by Ignazio Cara (Italy) Quote: Hello Ed, take a look at these pics . I hope this could help you, but if you have any kind of question, please reply here. Regards Ignazio Thanks, Ignazio. That helps a lot. Did you put it a lathe to do the mods? How does it work? Ed

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