Patent US3646569A successfully refreshed from Google Patents.
US3646569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive arrangement for variable width z-fold chart paper
Assignee: Beckman Coulter Inc
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Filing: 1970-04-13
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Granted: 1972-02-29
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Expires: 1990-04-13
Abstract
Abstract A drive arrangement for Z-fold chart paper is provided in which spaced apart guide means positioned between the back tensioning roller and the chart supply provide a positive lateral reference for the chart web just prior to its engagement with the back tensioning roller. The guide means may be conveniently changed in spacing to accommodate chart paper of different widths without requiring any readjustment of the drive rollers or the back tensioning roller.
Inventors
- 👤 Arthur R Erbach
- 👤 Albert Kupferschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:39
CPC Classifications
G; G01; G01D; G01D15/00; G01D15/28; G01D15/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
195 words
In a chart recorder, the combination of, a supply of Z-fold chart paper, a back-tension roller system including a backtension roller and a guide roller for holding the chart paper against the outer surface of said back-tension roller and for controlling the point at which the chart paper leaves said outer surface, a writing table positioned above said back-tension roller system, means for positioning said chart supply relative to said back-tension roller system, a plurality of drive rollers and mating pressure rollers positioned at the forward end of said writing table and arranged to pull the chart paper over said writing table against the force of said back-tension roller system, said drive rollers being arranged individually to slip when a predetermined torque is exerted thereon so that a nonskew drive system for the chart paper is provided, and spaced-apart guide means positioned between said back-tension roller and said chart supply to provide a positive lateral reference for the chart paper prior to its engagement with said back-tension roller, said guide means being adjustable to accommodate chart paper of different widths and to provide the proper positive lateral reference for each width of chart paper used.
Claim 2
Dependent Claim
195 words
In a chart recorder, the combination of, a supply of Z-fold chart paper, a back-tension roller system including a backtension roller and a guide roller for holding the chart paper against the outer surface of said back-tension roller and for controlling the point at which the chart paper leaves said outer surface, a writing table positioned above said back-tension roller system, means for positioning said chart supply relative to said back-tension roller system, a plurality of drive rollers and mating pressure rollers positioned at the forward end of said writing table and arranged to pull the chart paper over said writing table against the force of said back-tension roller system, said drive rollers being arranged individually to slip when a predetermined torque is exerted thereon so that a nonskew drive system for the chart paper is provided, and spaced-apart guide means positioned between said back-tension roller and said chart supply to provide a positive lateral reference for the chart paper prior to its engagement with said back-tension roller, said guide means being adjustable to accommodate chart paper of different widths and to provide the proper positive lateral reference for each width of chart paper used.
Claim 3
Dependent Claim
50 words
The combination of claim 1, wherein said guide means includes a first guide bar in close proximity to said back tensioning roller and having guide flanges on the ends thereof which are adapted to guide the edges of the chart paper as it is engaged by said back tensioning roller.
Claim 4
Dependent Claim
44 words
The combination of claim 2 wherein a second guide bar is positioned between said first guide bar aNd said chart supply, said second guide bar having guide flanges on the ends thereof which are also adapted to guide the edges of the chart paper.
Claim 5
Dependent Claim
29 words
The combination of claim 2, wherein one of said guide flanges on said first guide bar is adjustable along the length thereof to accommodate chart paper of different widths.
Claim 6
Dependent Claim
29 words
The combination of claim 3, wherein one of said guide flanges on said second guide bar is adjustable along the length thereof to accommodate chart paper of different widths.
Claim 7
Dependent Claim
41 words
The combination of claim 3, wherein leaf spring means is positioned to engage the chart paper passing over said second guide bar to hold the edges of the chart paper in engagement with said guide flanges on said first guide bar.
Claim 8
Dependent Claim
49 words
The combination of claim 1, wherein said plurality of drive rollers comprise three drive rollers one of which is positioned to engage chart paper of maximum width at the center thereof and the other two of which are positioned to engage the edges of chart paper of maximum width.
Claim 9
Dependent Claim
59 words
The combination of claim 7, wherein said guide means includes a guide bar over which paper is drawn from said chart supply by said drive rollers, and chart paper tension means adapted to engage the chart paper as it is drawn over said guide bar, said chart paper tension means being adapted to engage chart paper of different widths.
Claim 10
Dependent Claim
42 words
The combination of claim 8, wherein said chart paper tension means comprises a plurality of leaf spring fingers spaced along the length of said guide bar so that chart paper of different widths is engaged by different members of said spring fingers.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |