Patent US3789423A successfully refreshed from Google Patents.
US3789423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct writing recorder including an improved stylus assembly therefor
Assignee: Leica Microsystems Inc
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Filing: 1971-12-06
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Granted: 1974-01-29
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Expires: 1991-12-06
Abstract
Abstract A direct writing recorder having driving means, an arm carried by the driving means and having a cross-sectional area which gradually diminishes from a point adjoining the driving means to its apex, a stylus carried at the apex of the arm and a curved platen carrying the recording medium over which the stylus moves in recording electrical signals.
Inventors
- 👤 H Fawcett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:22
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
160 words
In a direct writing recorder, a stylus assembly comprising a double open ended, arm tapered continuously from its base to its apex said arm being of unitary construction terminating at said apex in a small, substantially rectangular opening and at the base in a relatively large circular opening, said arm having diametrically opposed flattened portions extending from said apex to a point spaced from the base, said flattened portions forming the upper and lower sides of said rectangular opening, and rounded side portions integrally joined with said flattened portions throughout their lengths and extending beyond said flattened portions, the arcuate length of the extending parts of said rounded sides being increased to form a continuous annular base structure integrally joined with the adjoining ends of said flattened positions, driving means, means securing the base of said arm to said driving means for oscillatory motion in a plane and a stylus carried by and extending from the apex of said arm.
Claim 2
Dependent Claim
160 words
In a direct writing recorder, a stylus assembly comprising a double open ended, arm tapered continuously from its base to its apex said arm being of unitary construction terminating at said apex in a small, substantially rectangular opening and at the base in a relatively large circular opening, said arm having diametrically opposed flattened portions extending from said apex to a point spaced from the base, said flattened portions forming the upper and lower sides of said rectangular opening, and rounded side portions integrally joined with said flattened portions throughout their lengths and extending beyond said flattened portions, the arcuate length of the extending parts of said rounded sides being increased to form a continuous annular base structure integrally joined with the adjoining ends of said flattened positions, driving means, means securing the base of said arm to said driving means for oscillatory motion in a plane and a stylus carried by and extending from the apex of said arm.
Claim 3
Dependent Claim
30 words
In a direct writing recorder according to claim 1 wherein the plane of one of said flattened portions is substantially normal to the axis of oscillation of said driving means.
Claim 4
Dependent Claim
48 words
In a direct writing recorder according to claim 1, a curved platen, a recording medium, and means guiding said recording medium along the curved platen, the radius of curvature of said platen being substantially equal to the radius of curvature of the path of movement of said stylus.
Claim 5
Dependent Claim
146 words
In a direct writing recorder, a stylus assembly comprising a double open ended continuously tapered hollow conical arm of unitary construction having a cross-sectional area which diminishes substantially uniformly from a circular base to a rectangular end, driving means, means securing the base of said arm to said driving means for oscillatory motion in a plane and a stylus carried by and extending from the apex of said arm, said stylus comprising a pair of thin flat metal members cemented in insulating relationship one to the other, an arcuate heating wire having each end electrically contacting and mechanically secured to one end of said metal members, and lead wires connected to the other ends of said metal members, said other ends of said metal members extending into and being adhered to the outer end of said conical arm with the lead wires extending through said arm.
Claim 6
Dependent Claim
146 words
In a direct writing recorder, a stylus assembly comprising a double open ended continuously tapered hollow conical arm of unitary construction having a cross-sectional area which diminishes substantially uniformly from a circular base to a rectangular end, driving means, means securing the base of said arm to said driving means for oscillatory motion in a plane and a stylus carried by and extending from the apex of said arm, said stylus comprising a pair of thin flat metal members cemented in insulating relationship one to the other, an arcuate heating wire having each end electrically contacting and mechanically secured to one end of said metal members, and lead wires connected to the other ends of said metal members, said other ends of said metal members extending into and being adhered to the outer end of said conical arm with the lead wires extending through said arm.
Claim 7
Dependent Claim
57 words
In a direct writing recorder according to claim 4 wherein said flat metal members are bent to displace said heating wire out of the plane of movement of said arm and said heating wire is bent in a direction to place the end thereof in a plane substantially parallel to the plane of movement of said arm.
Claim 8
Dependent Claim
74 words
In a direct writing recorder according to claim 1 wherein said driving means includes a shaft, a magnetic rotor carried by said shaft and means for effecting oscillation of said shaft in response to electrical signals, a potentiometer coupled to said shaft, a servo amplifier having input, output and feed back terminals, connections between said output terminals and said feed back terminals, the electrical signals to be recorded being fed to said input terminals.
Claim 9
Dependent Claim
135 words
In a direct writing recorder, a stylus assembly comprising a double open ended continuously tapered hollow conical arm of unitary construction having a cross-sectional area which diminishes substantially uniformly from a circular base to a rectangular end, driving means, means securing the base of said arm to said driving means for oscillatory motion in a plane and a stylus carried by and extending from the apex of said arm, said driving means including a driven shaft extending therefrom, a connecting member having an opening therein for securing it to said shaft and a cylindrical portion having its axis extending approximately normal to the axis of the shaft, the base portion of said arm terminating in a cylindrical section slidably engaging the said cylindrical portion and means adjustably securing said cylindrical section to said cylindrical portion.
Claim 10
Dependent Claim
135 words
In a direct writing recorder, a stylus assembly comprising a double open ended continuously tapered hollow conical arm of unitary construction having a cross-sectional area which diminishes substantially uniformly from a circular base to a rectangular end, driving means, means securing the base of said arm to said driving means for oscillatory motion in a plane and a stylus carried by and extending from the apex of said arm, said driving means including a driven shaft extending therefrom, a connecting member having an opening therein for securing it to said shaft and a cylindrical portion having its axis extending approximately normal to the axis of the shaft, the base portion of said arm terminating in a cylindrical section slidably engaging the said cylindrical portion and means adjustably securing said cylindrical section to said cylindrical portion.
Claim 11
Dependent Claim
52 words
In a direct wRiting recorder according to claim 7 wherein said arm has a pair of diametrically opposed flattened areas extending from the outer end of said arm to points spaced from the base thereof, the planes of said flattened areas being approximately parallel to the path of motion of said arm.
Claim 12
Dependent Claim
30 words
In a direct writing recorder according to claim 8 wherein the plane of one of said flattened portions is substantially normal to the axis of oscillation of said driving means.
Claim 13
Dependent Claim
48 words
In a direct writing recorder according to claim 7, a curved platen, a recording medium, and means guiding said recording medium along the curved platen, the radius of curvature of said platen being substantially equal to the radius of curvature of the path of movement of said stylus.
Claim 14
Dependent Claim
89 words
In a direct writing recorder according to claim 7 wherein said stylus comprises a pair of thin flat metal members cemented in insulating relationship one to the other, an arcuate heating wire having each end electrically contacting and mechanically secured to one end of one of said metal members, and lead wires connected to the other ends of said metal members, said other ends of said metal members extending into and being adhered to the outer end of said conical arm with the lead wires extending through said arm.
Claim 15
Dependent Claim
57 words
In a direct writing recorder according to claim 11 wherein said flat metal members are bent to displace said heating wire out of the plane of movement of said arm and said heating wire is bent in a direction to place the end thereof in a plane substantially parallel to the plane of movement of said arm.
Claim 16
Dependent Claim
74 words
In a direct writing recorder according to claim 7 wherein said driving means includes a shaft, a magnetic rotor carried by said shaft and means for effecting oscillation of said shaft in response to electrical signals, a potentiometer coupled to said shaft, a servo amplifier having input, output and feed back terminals, connections between said output terminals and said feed back terminals, the electrical signals to be recorded being fed to said input terminals.
Claim 17
Dependent Claim
48 words
In a direct writing recorder according to claim 6, a curved platen, a recording medium, and means guiding said recording medium along the curved platen, the radius of curvature of said platen being substantially equal to the radius of curvature of the path of movement of said stylus.
Claim 18
Dependent Claim
89 words
In a direct writing recorder according to claim 6 wherein said stylus comprises a pair of thin flat metal members cemented in insulating relationship one to the other, an arcuate heating wire having each end electrically contacting and mechanically secured to one end of one of said metal members, and lead wires connected to the other ends of said metal members, said other ends of said metal members extending into and being adhered to the outer end of said conical arm with the lead wires extending through said arm.
Claim 19
Dependent Claim
57 words
In a direct writing recorder according to claim 15 wherein said flat metal members are bent to displace said heating wire out of the plane of movement of said arm and said heating wire is bent in a direction to place the end thereof in a plane substantially parallel to the plane of movement of said arm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |