US3564170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple sheet removal detector employing electrically contacting rollers
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1969-04-24
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Granted: 1971-02-16
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Expires: 1989-04-24
Abstract
Abstract Apparatus for testing sheets to determine if a given thickness has been exceeded includes a fixed roller having a generally cylindrical surface including a sheet-carrying portion and an electrical contact portion, and a movable roller having a similar sheet-carrying portion and an electrical contact portion. The diameters of the electrical contact portions and the sheetcarrying portions are such that in normal operation the electrical contact portions of the two rollers are in contact with each other while the two sheet-carrying portions are spaced by a distance which permits passage of a sheet between them without displacement of the movable roller. In the event that this thickness is exceeded, as for example, would occur if more than one sheet were delivered between the rollers at one time, the movable roller would be moved so that the electrical contact would be broken to trigger an appropriate signal circuit.
Inventors
- 👤 Karl Rehm
- 👤 Herman Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:06
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/02; G01B7/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
329 words
Apparatus for testing sheets to determine if a given thickness has been exceeded, comprising, in combination: a. support means; b. a first roller mounted for rotation on the support means about a fixed axis, said first roller having a generally cylindrical surface including a sheet engaging portion and an electrical contact portion, said portions being in different axial positions on said first roller; c. a second roller also having a generally cylindrical surface including a sheet carrying engaging portion and an electrical contact portion in axial positions corresponding to those of said first roller; d. means mounting the second roller on the support means for rotation about an axis which is generally parallel to that of said first roller and for movement between a first position in which its electrical contact portion is in contact with the electrical contact portion of the first roller and a second position in which said electrical contact portions are spaced from each other; e. said electrical contact portion on at least one roller having a diameter which is larger than that of the sheet-engaging portion on said roller such that when the electrical-contacting portions of the first and second rollers are in engagement with each other the sheet-carrying portions of the rollers are spaced by a distance which permits passage of only one sheet therebetween without deflection of said second roller and which causes the simultaneous passage of more than one sheet therebetween to deflect said second roller for disengaging said electrical contact portions from one another; f. means for delivering a sheet between the sheet-contacting portions of said rollers; and g. signal circuit means electrically connected to said electric contact portions of each of said rollers for producing a signal in response to the movement of said electrical contact portions away from each other whereby a signal is produced if a sheet having a greater total thickness than is permitted by the spacing between said sheet-carrying portions is delivered between the rollers.
Claim 2
Dependent Claim
329 words
Apparatus for testing sheets to determine if a given thickness has been exceeded, comprising, in combination: a. support means; b. a first roller mounted for rotation on the support means about a fixed axis, said first roller having a generally cylindrical surface including a sheet engaging portion and an electrical contact portion, said portions being in different axial positions on said first roller; c. a second roller also having a generally cylindrical surface including a sheet carrying engaging portion and an electrical contact portion in axial positions corresponding to those of said first roller; d. means mounting the second roller on the support means for rotation about an axis which is generally parallel to that of said first roller and for movement between a first position in which its electrical contact portion is in contact with the electrical contact portion of the first roller and a second position in which said electrical contact portions are spaced from each other; e. said electrical contact portion on at least one roller having a diameter which is larger than that of the sheet-engaging portion on said roller such that when the electrical-contacting portions of the first and second rollers are in engagement with each other the sheet-carrying portions of the rollers are spaced by a distance which permits passage of only one sheet therebetween without deflection of said second roller and which causes the simultaneous passage of more than one sheet therebetween to deflect said second roller for disengaging said electrical contact portions from one another; f. means for delivering a sheet between the sheet-contacting portions of said rollers; and g. signal circuit means electrically connected to said electric contact portions of each of said rollers for producing a signal in response to the movement of said electrical contact portions away from each other whereby a signal is produced if a sheet having a greater total thickness than is permitted by the spacing between said sheet-carrying portions is delivered between the rollers.
Claim 3
Dependent Claim
52 words
The combination defined in claim 1 wherein there are two axially spaced electrical contact portions on each of said rollers, said contact portions being located on opposite sides of the sheet-engaging portion of each roller and being axially spaced from each other by a distance greater than the width of one sheet.
Claim 4
Dependent Claim
36 words
The combination defined in claim 2 wherein said signal circuit means includes a circuit in which the two electrical contacts formed by the engagement of the corresponding contact portions on each roller form a series circuit.
Claim 5
Dependent Claim
36 words
The combination defined in claim 2 wherein said signal circuit means includes a circuit in which the two electrical contacts formed by the engagement of the corresponding contact portions on each roller form a parallel circuit.
Claim 6
Dependent Claim
39 words
The combination defined in claim 1 including means for driving the first and the second roller at speeds such that the peripheral speeds of the electrical contact portions of each roller differ from each other by a small amount.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |