US3608846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape recorder
Assignee: Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
•
Filing: 1970-02-10
•
Granted: 1971-09-28
•
Expires: 1990-02-10
Abstract
Abstract The pointer which is movable along a scale on the deck of a tape recorder to indicate that length of tape which is available for recordal or reproduction of sound has a follower which tracks the thread of a spindle driven by the takeup reel at a speed which varies as a function of changes in diameter of tape which is convoluted on the core of the takeup reel. The graduations of the scale are equidistant from each other; therefore, the pitch of the thread on the spindle varies as a function of changes in rotational speed of the takeup reel when the tape is transported at a constant speed.
Inventors
- 👤 Hanswerner Pieplow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:21
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/0875; G11B27/00; G11B27/10; G11B27/34; Y; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
216 words
In a tape recorder, a combination comprising a support; a pair of reels rotatably mounted on said support and each having a core; a length of magnetic tape having end portions connected with said cores; transporting means for advancing the tape at a predetermined speed and for rotating one of said reels so that the respective core collects the tape thereon and the speed of said reels varies as a function of changes in diameter of convoluted tape on said cores; a fixed scale having a row of equidistant graduations; a pointer movable along said scale and including follower means; and drive means for moving said pointer along said scale, including a spindle rotatably mounted on said support and extending in parallelism with said scale, said spindle having an external thread tracked by said follower means so that the latter moves the pointer in response to rotation of said spindle, and means for rotating said spindle in response to and in synchronism with rotation of one of said cores, the pitch of said thread varying from one end toward the other end of said spindle so that said pointer is moved through identical distances per each unit of time in response to rotation of said one core while the tape is advanced at said predetermined speed.
Claim 2
Dependent Claim
216 words
In a tape recorder, a combination comprising a support; a pair of reels rotatably mounted on said support and each having a core; a length of magnetic tape having end portions connected with said cores; transporting means for advancing the tape at a predetermined speed and for rotating one of said reels so that the respective core collects the tape thereon and the speed of said reels varies as a function of changes in diameter of convoluted tape on said cores; a fixed scale having a row of equidistant graduations; a pointer movable along said scale and including follower means; and drive means for moving said pointer along said scale, including a spindle rotatably mounted on said support and extending in parallelism with said scale, said spindle having an external thread tracked by said follower means so that the latter moves the pointer in response to rotation of said spindle, and means for rotating said spindle in response to and in synchronism with rotation of one of said cores, the pitch of said thread varying from one end toward the other end of said spindle so that said pointer is moved through identical distances per each unit of time in response to rotation of said one core while the tape is advanced at said predetermined speed.
Claim 3
Dependent Claim
17 words
A combination as defined in claim 1, wherein said support is the deck of the tape recorder.
Claim 4
Dependent Claim
42 words
A combination as defined in claim 1, wherein the rate at which the pitch of said thread varies is the reciprocal of the rate at which the speed of said one core varies while the tape is transported at said predetermined speed.
Claim 5
Dependent Claim
67 words
A combination as defined in claim 1, wherein the pitch s of said thread varies in accordance with the equation wherein so is the pitch at said one end of the spindle, v is the speed of the tape, t is the length of the interval during which the tape is transported, d is the thickness of tape, and r is the radius of said one core.
Claim 6
Dependent Claim
15 words
A combination as defined in claim 1, wherein said spindle consists of synthetic plastic material.
Claim 7
Dependent Claim
18 words
A combination as defined in claim 1, wherein said means for rotating said spindle comprises a worm drive.
Claim 8
Dependent Claim
18 words
A combination as defined in claim 1, wherein said means for rotating said spindle comprises a belt drive.
Claim 9
Dependent Claim
16 words
A combination as defined in claim 1, wherein said graduations indicate various lengths of the tape.
Claim 10
Dependent Claim
14 words
A combination as defined in claim 1, wherein said graduations indicate units of time.
Claim 11
Dependent Claim
29 words
A combination as defined in claim 1, wherein said reels include a supply reel and a takeup reel and said one core is the core of said takeup reel.
References Cited (Backward Citations)
CA712756A
Cited
US2767474A
Cited
US2998749A
Cited
US3046019A
Cited
US3025607A
Cited
US3441283A
Cited
US3476894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |