Re: [PPLetterpress] Re: Attaching a Motor to an Old Style C&P with a "Clutch" mechanism
- Yes, I hadn't realised you were completely familair with it. That sounds
like a really nice system; I don't think I've ever seen one like it. I
wouldn't mind having one myself!
> Hi Rich,
> Thank you for your concern for my safety, but I don't
> think I made myself clear...this clutch arrangement
> was designed precisely as a variable speed control for
> these presses.
> I have used it for almost 40 years now without any
> problems, and plan on continuing to do so for many,
> many more without any fears or safety concerns.
> As I said before, it's absolutely ingenious and works
> ever so smoothly. The "wooden shoes" gently engage the
> motor and put less strain on the motor than other
> systems would that have a motor pully connected to a
> fixed. The clutch system gently engages the motor
> torque to the drive shaft instead of jolting it with
> an "all of a sudden" and immediate transfer of power
> like other pulley set ups do.
> Once the flywheel is going, the amount of energy to
> keep it going is pretty minimal...so the "clutch"
> simply gives it little"nudges" when it's already
> spinning, so there's not much friction involved... and
> certainly not enough to ever catch fire!
> So no, there is no danger of "friction fires" or any
> other calamities, and I fully intend to keep using it.
> I'm sure it will be working long after all the rest of
> the "direct drive" systems on other presses have
> burned out. :-)
> Maybe some day I'll have to make a YouTube movie of it
> and let everyone see what is somewhat difficult to
> describe in text, no matter what font I'm using!
> Best wishes,
> Steve Robison
> The Robison Press
> Belmont, CA (just south of San Francisco)
> --- rpolinski@... wrote:
>> Unless I'm badly mistaken that's a clutch and not a
>> speed control. I'm
>> sure it affects the speed but at the cost of burning
>> out the motor and
>> possibly setting the wooden shoes on fire from
>> friction. I'd really be
>> certain about that before I continued to use it as a
>> speed control.
>> > Hello everyone...
>> > My 10x15 C&P Oldstyle came with a "clutch"
>> > on the right hand side that variably controls
>> > The motor runs at a constant RPM with a belt
>> > to about a 12" diameter wheel on the drive shaft
>> > similar to most drive set-ups.
>> > The difference is that this right hand side wheel
>> > two interlocking parts to it and has a couple of
>> > wooden shoes in it. When a lever is moved, the
>> > shoes get pressed against the inside of this wheel
>> > slightly rub against the inside of the wheel until
>> > power is slowly transferred to the drive shaft.
>> > allows for a completely variable speed control
>> from a
>> > crawl to high speed and everything in-between.
>> > It's an absolute joy to operate because I can slow
>> > way down for difficult to feed jobs, and speed it
>> > up for easy fast runs. I think it's mechanically
>> > ingenious and wonder why I haven't seen more
>> > equipped this way.
>> > The press came that way when I salvaged it from an
>> > empty lot next to a defunct letterpress shop back
>> > the early 70's.
>> > Maybe it was a mechanism used in conjunction with
>> > centralized pulley drives from overhead in large
>> > with steam driven power shafts. But my press has a
>> > in the drive shaft to indicate that it was
>> > treadle operated and later converted to motor
>> > so I don't know...unless they offered the press in
>> > either configuration from the factory and didn't
>> > bother to have straight shafts in them. But the
>> > "clutch" mechanism looks like original equipment
>> > was designed for this type of press, or maybe as a
>> > factory add-on option offered by Chandler and
>> > maybe before variable speed motors were popular or
>> > available.
>> > Anyway, does anyone else have a set-up like this
>> > know of it's origins? I'd be curious to know...
>> > Best wishes,
>> > --Steve
>> > Steve Robison
>> > The Robison Press
>> > Belmont, CA (about 25 miles south of San
>> > Steve Robison
>> > robisonsteve@...
>> > Never miss a thing. Make Yahoo your home page.
>> > http://www.yahoo.com/r/hs
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> Steve Robison
> Never miss a thing. Make Yahoo your home page.