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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc.

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Old 3rd Jun 2021, 7:15 pm   #1
themylogin
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Default cassette deck mechanism with large diameter flywheel

Attached are the photos of a tape drive mechanism that was widely used in the middle-class Soviet tape decks. It seems quite unusual, using a heavy large-diameter flywheel (implying a 220V motor taken from a reel-to-reel machine). The only idler is used for playback mode; in forward/rewind mode, corresponding pulleys are pulled a little bit back and come into direct contact with the flywheel, resulting in a very noisy (and sometimes tape-tearing) but rapid rewind. My sources claim that this is not an own development and that it was hugely inspired by one of the SONY decks; however, I was not able to find anything like it. Has anyone seen a similar mechanism? I would be very grateful to see an original implementation of this idea.
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Old 3rd Jun 2021, 8:33 pm   #2
TIMTAPE
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Default Re: cassette deck mechanism with large diameter flywheel

I think various companies used AC motors for their earlier mains only powered decks: Sony, Akai and Pioneer to name three.

An interesting feature in this one is that what looks like a metal take up spool idler seems to gain its traction by riding directly on the rubber flywheel belt. I've not seen that before.
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Old 3rd Jun 2021, 9:53 pm   #3
TIMTAPE
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Default Re: cassette deck mechanism with large diameter flywheel

Clarification: the idler seems to connect with the belt as the belt is wrapped around the flywheel. Not necessarily the best way as there would be only a small surface area of contact between idler and belt. More common for the belt to "wrap" around the idler for better grip.
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Old 5th Jun 2021, 1:18 pm   #4
Jez1234
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Default Re: cassette deck mechanism with large diameter flywheel

The Wollensak mechanism had a large flywheel, AC motor and rewind by idler pressing against flywheel. Used in Wollensak, Advent and NEAL decks amongst others. Actually works very well, if rather "agricultural".
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Old 5th Jun 2021, 3:30 pm   #5
TIMTAPE
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Default Re: cassette deck mechanism with large diameter flywheel

Probably a similar heavy duty setup was used in their high speed cassette AV 2770 duplicators. Unfortunately a good overall design marred by the reel tables with their integral felt and plastic clutches which tended to increase in torque over time, leading to damaged tapes.
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Old 5th Jun 2021, 3:48 pm   #6
paulsherwin
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Default Re: cassette deck mechanism with large diameter flywheel

As Tim says, synchronous AC motors were used in most early Japanese HiFi decks. DC motors only became common in about 1977.
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