US4071861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reproducing system
Assignee: Panasonic Holdings Corp
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Filing: 1976-06-23
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Granted: 1978-01-31
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Expires: 1996-06-23
Abstract
Abstract A magnetic recording and reproducing system comprises a capstan, reel shafts, a motor for rotatably driving said capstan and said reel shafts, a magnetic tape wound up by the rotation of the reel shafts, a pinch roller for pressing the tape against the capstan, and a drive mechanism for driving said pinch roller into engagement with and disengagement from said capstan by a rotation force of said motor.
Inventors
- 👤 Huminori Hirose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:44
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/1883
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
183 words
A magnetic recording and reproducing system comprising a capstan, reel shafts, motor means operative when connected to a voltage source, coupling means for transmitting the rotational force of said motor to said capstan and reel shafts, a pinch roller for pressing a magnetic tape to said capstan, an engagement-disengagement drive mechanism responsive to said coupling means for selectively driving said pinch roller into engagement with and disengagement from said capstan, an electromagnetic plunger operative when connected to a voltage source to cause an initial motion of said engagement-disengagement drive mechanism which serves to couple said coupling means to said engagement-disengagement drive mechanism, and operation switch means for connecting said electromagnetic plunger and said motor to a voltage source, said electromagnetic plunger and engagement-disengagement drive mechanism arranged such that a first operation of said electromagnetic plunger serves to couple said engagement-disengagement drive mechanism to said coupling means to drive said pinch roller into engagement with said capstan and a second operation of said electromagnetic plunger serves to couple said engagement-disengagement drive mechanism to said coupling means to disengage said pinch roller from said capstan.
Claim 2
Dependent Claim
183 words
A magnetic recording and reproducing system comprising a capstan, reel shafts, motor means operative when connected to a voltage source, coupling means for transmitting the rotational force of said motor to said capstan and reel shafts, a pinch roller for pressing a magnetic tape to said capstan, an engagement-disengagement drive mechanism responsive to said coupling means for selectively driving said pinch roller into engagement with and disengagement from said capstan, an electromagnetic plunger operative when connected to a voltage source to cause an initial motion of said engagement-disengagement drive mechanism which serves to couple said coupling means to said engagement-disengagement drive mechanism, and operation switch means for connecting said electromagnetic plunger and said motor to a voltage source, said electromagnetic plunger and engagement-disengagement drive mechanism arranged such that a first operation of said electromagnetic plunger serves to couple said engagement-disengagement drive mechanism to said coupling means to drive said pinch roller into engagement with said capstan and a second operation of said electromagnetic plunger serves to couple said engagement-disengagement drive mechanism to said coupling means to disengage said pinch roller from said capstan.
Claim 3
Dependent Claim
47 words
A magnetic recording and reproducing system according to claim 1 further including a magnetic transducing head mechanically coupled to said pinch roller which moves into engagement with and disengagement from said magnetic tape in response to the engagement and disengagement of said pinch roller and said capstan.
Claim 4
Dependent Claim
47 words
A magnetic recording and reproducing system according to claim 1 further including a selection switch responsive to movement of said pinch roller for switching said motor between a slow rotation mode and a fast rotation mode in response to the engagement and disengagement of said pinch roller.
Claim 5
Dependent Claim
57 words
A magnetic recording and reproducing system according to claim 1 further including a selection switch responsive to movement of said pinch roller and containing a slow contact and a fast contact for switching said motor between a fast rotation mode and a slow rotation mode and for feeding voltage to said electromagnetic plunger through said slow contact.
Claim 6
Dependent Claim
148 words
A magnetic recording and reproducing system according to claim 1 further including a selection switch responsive to movement of said pinch roller and containing slow and fast contacts which are coupled, respectively, to slow and fast inputs of said motor for switching said motor between a slow rotation mode and a fast rotation mode in response to the engagement and disengagement of said pinch roller, a fast feed switch and a rewind switch inserted in a circuit of a fast contact of said selection switch, and a magnetic tape end sensing switch for coupling a voltage to said electromagnetic plunger for disengaging said pinch roller from said capstan and switching said selection switch to the fast contact when said selection switch is on its slow contact side and for disabling said fast feed switch and said rewind switch when said selection switch is on its fast contact side.
Claim 7
Dependent Claim
103 words
A magnetic recording and reproducing system according to claim 1 further including a selection switch responsive to movement of said pinch roller and containing slow and fast contacts connected, respectively, to slow and fast inputs of said motor for switching said motor between a slow rotation mode and a fast rotation mode in response to the engagement and disengagement of said pinch roller, a counter for counting the number of revolutions of said reel shafts, and a counter switch actuated at a predetermined count of said counter for feeding a voltage to said electromagnetic plunger through a slow contact of said selection switch.
Claim 8
Dependent Claim
81 words
A magnetic recording and reproducing system according to claim 1 further including a selection switch responsive to movement of said pinch roller and containing slow and fast contacts which are coupled, respectively, to slow and fast inputs of said motor for switching said motor between a slow rotation mode and a fast rotation mode in response to the engagement and disengagement of said pinch roller, and a forward-reverse switch inserted between a fast contact of said selection switch and said motor.
Claim 9
Dependent Claim
26 words
A magnetic recording and reproducing system according to claim 1 wherein said motor is a two-speed motor capable of rotating at high speed and low speeds.
Claim 10
Dependent Claim
95 words
A system according to claim 1 further comprising a selection switch responsive to movement of said pinch roller and containing slow and fast contacts coupled, respectively, to slow and fast inputs to said motor means for causing said motor to rotate at a low or high speed in response to the engagement and disengagement of said pinch roller with said capstan, a unidirectional conductive element connecting said slow contact through said operation switch means to said voltage source when a common terminal of said selection switch coupled to said voltage source contacts said fast contact.
Claim 11
Dependent Claim
93 words
A magnetic recording and reproducing system according to claim 1 wherein said engagement-disengagement mechanism includes a switch pin for driving said pinch roller into engagement with and disengagement from said capstan, an elevation lever coupled through a hinge to a switch lever to which said switch pin is mounted, a slide lever slidably associated with said switch lever and said elevation lever, said electromagnetic plunger being coupled to said slide lever for imparting a shifting force thereto which lowers said elevation lever to couple a flywheel of said motor to said engagement-disengagement mechanism.
Claim 12
Dependent Claim
44 words
A magnetic recording and reproducing system according to claim 10 wherein said engagement-disengagement drive mechanism includes a snap action spring means, the force of which is overcome each time said engagement-disengagement drive mechanism moves said pinch roller either towards or away from said capstan.
Claim 13
Dependent Claim
123 words
A magnetic recording and reproducing system according to claim 1 wherein said engagement-disengagement drive mechanism includes a rotary cam plate coupled to said pinch roller for driving said pinch roller into engagement with and disengagement from said capstan, a cutout disc supported by a cam shaft attached to said rotary cam plate, a movable cutout disc swingably mounted to said cam shaft and coupled to said cutout disc through a pressurizing torque spring, a roller connected to said capstan which engages with the periphery of said cutout disc except at the cutout portions for rotating said rotary cam plate, and said electromagnetic plunger has a plunger pawl which engages with and disengages from cutouts of said cutout disc and said movable cutout disc.
Claim 14
Dependent Claim
31 words
A magnetic recording and reproducing system according to claim 12 wherein said engagement-disengagement drive mechanism includes a spring for supporting said pinch roller in engagement and disengagement relation to said capstan.
References Cited (Backward Citations)
US3809827A
Cited
US3770176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |