US3753615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning apparatus
Assignee: DYK RES CORP VAN
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Filing: 1972-04-26
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Granted: 1973-08-21
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Expires: 1992-04-26
Abstract
Abstract An optical scanning arrangement for use in a xerographic copier, in which a mirror is rotated through a predetermined angle to scan the document to be copied. The angle through which the mirror is rotated varies according to the length of the document. A spring returns the mirror to its initial rest position. A shaft rotating at a fixed angular velocity is coupled to the mirror through an overrunning clutch, so as to limit the speed at which the mirror returns to its rest position to a velocity corresponding to that of the shaft. A linkage is provided to reduce the angular velocity of the mirror as the rest position of the mirror is approached, thus minimizing shock to the scanning mechanism.
Inventors
- 👤 D Erny
- 👤 M Brandle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:51
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
254 words
Scanning apparatus for reciprocating an optical scanning element, comprising: a first shaft to which said optical element may be secured; a second shaft; a scan return limit drive means for rotating said second shaft at a predetermined angular velocity; a third shaft; a disc secured to said third shaft; an overrunning clutch for coupling said second shaft to said third shaft; a fourth shaft; a scan drive motor for rotating said fourth shaft at a desired angular velocity; means including a scan drive clutch for coupling said fourth shaft to said first shaft to cause said first shaft to rotate from an initial rest position through a predetermined angle in a scanning direction; means including a spring for disposing said first shaft in said rest position and for rotating said first shaft in the opposite direction to return said first shaft to said rest position after said first shaft has been rotated through said predetermined angle; a first member mounted for rotation in synchronism with the rotation of said first shaft; and means, including a connecting link eccentrically pivotally secured at opposite ends thereof to said disc and said first member, for coupling said first shaft to said third shaft to prevent the angular velocity of rotation of said first shaft in said opposite direction from exceeding a value determined by the predetermined angular velocity of said second shaft, and for decreasing the angular velocity of rotation of said first shaft in said opposite direction as said first shaft returns to said rest position.
Claim 2
Dependent Claim
254 words
Scanning apparatus for reciprocating an optical scanning element, comprising: a first shaft to which said optical element may be secured; a second shaft; a scan return limit drive means for rotating said second shaft at a predetermined angular velocity; a third shaft; a disc secured to said third shaft; an overrunning clutch for coupling said second shaft to said third shaft; a fourth shaft; a scan drive motor for rotating said fourth shaft at a desired angular velocity; means including a scan drive clutch for coupling said fourth shaft to said first shaft to cause said first shaft to rotate from an initial rest position through a predetermined angle in a scanning direction; means including a spring for disposing said first shaft in said rest position and for rotating said first shaft in the opposite direction to return said first shaft to said rest position after said first shaft has been rotated through said predetermined angle; a first member mounted for rotation in synchronism with the rotation of said first shaft; and means, including a connecting link eccentrically pivotally secured at opposite ends thereof to said disc and said first member, for coupling said first shaft to said third shaft to prevent the angular velocity of rotation of said first shaft in said opposite direction from exceeding a value determined by the predetermined angular velocity of said second shaft, and for decreasing the angular velocity of rotation of said first shaft in said opposite direction as said first shaft returns to said rest position.
Claim 3
Dependent Claim
34 words
Scanning apparatus according to claim 1, further including means for permitting said scan drive clutch to couple said fourth shaft to said first shaft Only when said first shaft is in saId rest position.
Claim 4
Dependent Claim
40 words
Scanning apparatus according to claim 1, further including a fifth shaft disposed parallel to said first shaft, said fifth shaft being coupled to said fourth shaft through said scan drive clutch, said first member being secured to said fifth shaft.
Claim 5
Dependent Claim
62 words
Scanning apparatus according to claim 3, further including a second member secured to said first shaft, a spring secured to said second member to cause said first shaft to rotate in said opposite direction, and a flexible strip coupling a point of said first member remote from said fifth shaft to a point of said second member remote from said first shaft.
Claim 6
Dependent Claim
211 words
Scanning apparatus, comprising: an optical scanning element mounted for rotation on a first shaft: first drive means for rotating said first shaft from an initial rest position through a predetermined angle in a scanning direction; and second drive means for rotating said first shaft in the opposite direction to return the shaft to said rest position, said second drive means including (i) scan return sprinG means for rotating said first shaft in said opposite direction, (ii) a second shaft, (iii) scan return limit drive means for rotating said second shaft at a given angular velocity, (iv) an overrunning clutch, (v) a third shaft coupled to said second shaft through said overrunning clutch, (vi) a disc secured to said third shaft, (vii) a first member coupled for rotation with said first shaft, and (viii) a connecting link eccentrically pivotally secured at opposite ends thereof to said first member and said disc, whereby said first and second shafts are coupled only when the angular velocity of rotation of said first shaft in said opposite direction has a value corresponding to at least said given angular velocity of said second shaft, and the angular velocity of rotation of said first shaft in said opposite direction decreases as said first shaft approaches said rest position.
Claim 7
Dependent Claim
211 words
Scanning apparatus, comprising: an optical scanning element mounted for rotation on a first shaft: first drive means for rotating said first shaft from an initial rest position through a predetermined angle in a scanning direction; and second drive means for rotating said first shaft in the opposite direction to return the shaft to said rest position, said second drive means including (i) scan return sprinG means for rotating said first shaft in said opposite direction, (ii) a second shaft, (iii) scan return limit drive means for rotating said second shaft at a given angular velocity, (iv) an overrunning clutch, (v) a third shaft coupled to said second shaft through said overrunning clutch, (vi) a disc secured to said third shaft, (vii) a first member coupled for rotation with said first shaft, and (viii) a connecting link eccentrically pivotally secured at opposite ends thereof to said first member and said disc, whereby said first and second shafts are coupled only when the angular velocity of rotation of said first shaft in said opposite direction has a value corresponding to at least said given angular velocity of said second shaft, and the angular velocity of rotation of said first shaft in said opposite direction decreases as said first shaft approaches said rest position.
Claim 8
Dependent Claim
31 words
Scanning apparatus according to claim 5, wherein said first drive means includes a scan drive motor, and means including a scan drive clutch for coupling said motor to said first shaft.
Claim 9
Dependent Claim
32 words
Scanning apparatus according to claim 6, further including means for permitting said scan drive clutch to couple said motor to said first shaft only when said shaft is in said rest position.
Claim 10
Dependent Claim
40 words
Scanning apparatus according to claim 5, wherein said first drive means includes a fourth shaft, a scan drive motor for rotating said fourth shaft, and means including a scan drive clutch for coupling said fourth shaft to said first shaft.
Claim 11
Dependent Claim
34 words
Scanning apparatus according to claim 8, further including means for permitting said scan drive clutch to couple said fourth shaft to said first shaft only when said first shaft is in said rest position.
Claim 12
Dependent Claim
40 words
Scanning apparatus according to claim 9, further including a fifth shaft disposed parallel to said first shaft, said fifth shaft being coupled to said fourth shaft through said scan drive clutch, said first member being secured to said fifth shaft.
Claim 13
Dependent Claim
44 words
Scanning apparatus according to claim 10, further including a second member secured to said first shaft, and a flexible strip coupling a point of said first member remote from said fifth shaft to a point of said second member remote from said first shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |