Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are different sizes. (Motor drive pulley will be in the small loop end of the belt in illustration above.)
How does that result in the same tape speed in both directions?
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are different sizes. (Motor drive pulley will be in the small loop end of the belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
In article <0001HW.1C936E810003F2001244403CF@news.eternal-
september.org>, not@home.cow says...
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are >> different sizes. (Motor drive pulley will be in the small loop end of the
belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
Its been a while since I've seen the inside of a cassett drive.
But memory tells me you have a pinch roller with pin shaft that governs
the actual speed.
Jamie
Its been a while since I've seen the inside of a cassett drive.
But memory tells me you have a pinch roller with pin shaft that governs
the actual speed.
Jamie
do they have the same capstan diameter?
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism
are different sizes. (Motor drive pulley will be in the small loop end
of the belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are different sizes. (Motor drive pulley will be in the small loop end of the belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
One (the small one) is the motor capstan.
The other one is the pressure capstan.
Direction is given by the rotation of the first one and speed is servo-controlled.
Generally there is a lever for the tension of the tape.
DaveC a crit :
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette
mechanism are
different sizes. (Motor drive pulley will be in the small loop end of the
belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
Jasen Betts asked wisely:
do they have the same capstan diameter?
I was just about to say “Silly question!” but instead thought better...
one 2mm, one 2.2mm
I guess the difference is driven (c; by the fact (stated by Phil) that the flywheels are different diameters to discourage mechanical resonance.
Thanks Jasen!
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are different sizes. (Motor drive pulley will be in the small loop end of the belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
On 11/03/2016 21:22, DaveC wrote:
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are >> different sizes. (Motor drive pulley will be in the small loop end of the
belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
Aiwa AD WX888 , 1997,I worked on once, spindle to one capstan 2.49mm >diameter and the other 2.69mm
On Sat, 12 Mar 2016 17:37:50 +0000, N_Cook <diverse@tcp.co.uk> wrote:
On 11/03/2016 21:22, DaveC wrote:
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are
different sizes. (Motor drive pulley will be in the small loop end of the >>> belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
Aiwa AD WX888 , 1997,I worked on once, spindle to one capstan 2.49mm >>diameter and the other 2.69mm
Aiwa ADR470, forward flywheel was inside the loop, reverse was outside
the loop. Both always driven. choice of pinch rollers determine
direction. Flywheel diameters compensate for inside/outside belt
diameter. Only speed adjustment was screw-driver inside the motor
housing itself.
Harman Kardon HK300 had a single flyheel, spindle impressed
alternately on fw or rev through a clutch that was always
disintegrating. Same in-the-motor adgustment.
RL
On 3/12/2016 12:36 AM, Look165 wrote:
One (the small one) is the motor capstan.
The other one is the pressure capstan.
Direction is given by the rotation of the first one and speed is servo-controlled.
Generally there is a lever for the tension of the tape.
DaveC a crit :
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette
mechanism are
different sizes. (Motor drive pulley will be in the small loop end of the >> belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
The tape speed is controlled by the motor drive capstan.
Doesn't matter which way the tape is going.
The two flywheels are different sizes, but have the same
rotation speed. That causes the belt to
stretch on one side and compress on the other to account for
the different sizes. That belt tension creates the tape tension.
That's independent of the direction of the rotation.
Tape speed across the heads is always controlled by the drive motor.
On Sat, 12 Mar 2016 13:06:27 -0500, legg <legg@nospam.magma.ca> wrote:
On Sat, 12 Mar 2016 17:37:50 +0000, N_Cook <diverse@tcp.co.uk> wrote:
On 11/03/2016 21:22, DaveC wrote:
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are
different sizes. (Motor drive pulley will be in the small loop end of the >>>> belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
Aiwa AD WX888 , 1997,I worked on once, spindle to one capstan 2.49mm >>>diameter and the other 2.69mm
Aiwa ADR470, forward flywheel was inside the loop, reverse was outside
the loop. Both always driven. choice of pinch rollers determine
direction. Flywheel diameters compensate for inside/outside belt
diameter. Only speed adjustment was screw-driver inside the motor
housing itself.
Harman Kardon HK300 had a single flyheel, spindle impressed
alternately on fw or rev through a clutch that was always
disintegrating. Same in-the-motor adgustment.
RL
All those mechanical means of reproducing sound - wax disks, tinfoil, >shellac, plastic, wire, tape - were all awful. Chemical photography
was a nuisance, too. Ditto typing and carbon paper.
All those mechanical means of reproducing sound - wax disks, tinfoil, shellac, plastic, wire, tape - were all awful. Chemical photography
was a nuisance, too. Ditto typing and carbon paper.
On Sat, 12 Mar 2016 13:06:27 -0500, legg <legg@nospam.magma.ca> wrote:
On Sat, 12 Mar 2016 17:37:50 +0000, N_Cook <diverse@tcp.co.uk> wrote:
On 11/03/2016 21:22, DaveC wrote:
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are
different sizes. (Motor drive pulley will be in the small loop end of the >>>> belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
Aiwa AD WX888 , 1997,I worked on once, spindle to one capstan 2.49mm >>>diameter and the other 2.69mm
Aiwa ADR470, forward flywheel was inside the loop, reverse was outside
the loop. Both always driven. choice of pinch rollers determine
direction. Flywheel diameters compensate for inside/outside belt
diameter. Only speed adjustment was screw-driver inside the motor
housing itself.
Harman Kardon HK300 had a single flyheel, spindle impressed
alternately on fw or rev through a clutch that was always
disintegrating. Same in-the-motor adgustment.
RL
All those mechanical means of reproducing sound - wax disks, tinfoil, >shellac, plastic, wire, tape - were all awful. Chemical photography
was a nuisance, too. Ditto typing and carbon paper.
In article <2m0beb1lgja42278t1ni529ihahvjsc94q@4ax.com>,
legg@nospam.magma.ca says...
I can't think of a single method of 'reproducing sound' that doesn't involve mechanical means.
Sound is a mechanical phenomenon. Humans use flapping meat.
I can imagine a method that used heat to move the air, perhaps with a
plasma to make it fast. (Like a modulated lightning flash.) But I cannot
be bothered to construct a search to find out if it has been done successfully...
Mike.
I can't think of a single method of 'reproducing sound' that doesn't
involve mechanical means.
Sound is a mechanical phenomenon. Humans use flapping meat.
In article <2m0beb1lgja42278t1ni529ihahvjsc94q@4ax.com>,
legg@nospam.magma.ca says...
I can't think of a single method of 'reproducing sound' that doesn't
involve mechanical means.
Sound is a mechanical phenomenon. Humans use flapping meat.
I can imagine a method that used heat to move the air, perhaps with a
plasma to make it fast. (Like a modulated lightning flash.) But I cannot
be bothered to construct a search to find out if it has been done >successfully...
Oh, smarter-than-I people,
http://imgur.com/WPEoOu1
The 2 belt-drive capstan flywheels in an auto-reverse cassette mechanism are different sizes. (Motor drive pulley will be in the small loop end of the belt in illustration above.)
How does that result in the same tape speed in both directions?
Confused...
In article <MPG.314f98caaaa273144@news.plus.net>,
MJC <gravity@mjcoon.plus.com> wrote:
In article <2m0beb1lgja42278t1ni529ihahvjsc94q@4ax.com>,
legg@nospam.magma.ca says...
I can't think of a single method of 'reproducing sound' that doesn't
involve mechanical means.
Sound is a mechanical phenomenon. Humans use flapping meat.
I can imagine a method that used heat to move the air, perhaps with a
plasma to make it fast. (Like a modulated lightning flash.) But I cannot
be bothered to construct a search to find out if it has been done
successfully...
Mike.
I recall a conversation from years ago with a *VERY* old theater projectionist, who spoke of what he called "flame speakers". Don't know
if it was an artifact of his (at the time) 80+ year old mind going, or reality, but what he described made sense to me on several levels,
though I've never bothered to try chasing it down. Apparently, back in
the early days of talkies, one method of sound production involved a gas nozzle (unsure if he meant gasoline, or something like propane/LP gas) "tuned" to produce a blue flame (he was very clear on that point - lots
of the conversation came back to how he had to tinker with the flame at
each showing, otherwise the sound wasn't good) several feet tall in a combustion chamber, into which was shoved a set of tungsten electrodes.
The 'trodes were driven at high voltages by any of several amplification methods (frequently varying by theater, if the old guy's tale was to be believed) to charge the plasma of the flame, which apparently caused it
to "dance", driving a diaphragm like that of a speaker. Supposedly,
amazingly high volumes with very good fidelity could be achieved.
Like I say, I've never actually gone to the effort of tracking it down,
and I have no idea if it was a failing mind's invention, or reality,
but... <shrug> Seems to me like it COULD work.
In article <2m0beb1lgja42278t1ni529ihahvjsc94q@4ax.com>,
legg@nospam.magma.ca says...
I can't think of a single method of 'reproducing sound' that doesn't
involve mechanical means.
Sound is a mechanical phenomenon. Humans use flapping meat.
I can imagine a method that used heat to move the air, perhaps with a
plasma to make it fast. (Like a modulated lightning flash.) But I cannot
be bothered to construct a search to find out if it has been done successfully...
Mike.
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