US3601392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet registering apparatus
Assignee: Xerox Corp
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Filing: 1969-07-03
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Granted: 1971-08-24
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Expires: 1989-07-03
Abstract
Abstract Apparatus to register and align a cut sheet of support material prior to the support material being forwarded to the xerographic transfer station. Register stop rolls are positioned prior to the transfer station and are programmed by means of a cam and gear arrangement to arrest the leading edge of a sheet of material as it is forwarded from a sheet feed tray. The sheet is registered in the stop rolls and is held in friction-driving contact with stop rolls by means of a pair of idler rolls cammed into operative relation therewith. The stop rolls are rotated rapidly to accelerate the sheet of material to the desired constant velocity at which time a second pair of cooperating feed rolls adapted to forward the sheet to the transfer station are cammed into engagement with the moving sheet. For a brief period of time the sheet is being positively driven towards the transfer station by the two drive means. The register stop rolls are programmed to release the sheet prior to completing one revolution and the remaining forwarding function completed by the second set of drive rolls.
Inventors
- 👤 Merton R Spear Jr
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:28
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6529; B; B65; B65H; B65H9/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
250 words
Apparatus to register and forward cut sheets of material fed from a sheet supply station along a predetermined path of travel including a plurality of register rolls mounted on a supporting shaft for rotation independently thereof said rolls being coaxially aligned adjacent to said path of travel, each of said rolls having a stop surface thereon being capable of extending into said path of travel to engage the leading edge of a sheet forwarded therealong whereby said sheet is registered against said stop surfaces to support the sheet in pressure contact against said register rolls, a first camming means to move a first set of pinch rolls into engagement with a sheet registered against the stops and hold said pinch rolls in engagement therewith for a predetermined period of time, control means to rotate said register rolls during the period of pinch roll engagement to accelerate a sheet held in contact therewith to a predetermined constant velocity and maintain said sheet at said constant velocity, a plurality of drive rolls coaxially aligned with said register rolls on said supporting shaft, the drive rolls having an outer surface thereon being continually moving at said predetermined constant velocity, a second set of pinch rolls arranged to move into contact with a sheet engaged by said register rolls to hold said sheet in pressure contact against said constantly rotated drive rolls, and second camming means to move said second set of pinch rolls into engagement with a sheet moving at the constant velocity.
Claim 2
Dependent Claim
250 words
Apparatus to register and forward cut sheets of material fed from a sheet supply station along a predetermined path of travel including a plurality of register rolls mounted on a supporting shaft for rotation independently thereof said rolls being coaxially aligned adjacent to said path of travel, each of said rolls having a stop surface thereon being capable of extending into said path of travel to engage the leading edge of a sheet forwarded therealong whereby said sheet is registered against said stop surfaces to support the sheet in pressure contact against said register rolls, a first camming means to move a first set of pinch rolls into engagement with a sheet registered against the stops and hold said pinch rolls in engagement therewith for a predetermined period of time, control means to rotate said register rolls during the period of pinch roll engagement to accelerate a sheet held in contact therewith to a predetermined constant velocity and maintain said sheet at said constant velocity, a plurality of drive rolls coaxially aligned with said register rolls on said supporting shaft, the drive rolls having an outer surface thereon being continually moving at said predetermined constant velocity, a second set of pinch rolls arranged to move into contact with a sheet engaged by said register rolls to hold said sheet in pressure contact against said constantly rotated drive rolls, and second camming means to move said second set of pinch rolls into engagement with a sheet moving at the constant velocity.
Claim 3
Dependent Claim
34 words
The apparatus of claim 1, wherein the camming means to move said first and second pinch rolls comprise a cam and a follower arm which are moving in timed relation with said control means.
Claim 4
Dependent Claim
38 words
The apparatus of claim 2, wherein said second set of pinch rolls are moved into engagement with the moving sheet during the predetermined period in which said first set of pinch rolls are in engagement with said sheet.
Claim 5
Dependent Claim
29 words
The apparatus of claim 3, further including subsequent sheet-advancing means arranged to engage a sheet moving at the constant velocity and forward said sheet to a subsequent processing station.
Claim 6
Dependent Claim
48 words
The apparatus of claim 4, wherein said control means returns said register rolls to a position wherein the stop surfaces thereon are in a condition to engage the next subsequent sheet forwarded from the supply station after the trailing edge of the sheet has cleared said register rolls.
Claim 7
Dependent Claim
234 words
In a copying apparatus of the type wherein individual cut sheets of support material are forwarded one at a time through a sheet-registering station, the apparatus including a shaft journaled for rotation in the sheet-registering station, a pair of register rolls mounted to rotate freely upon said shaft, each of said rolls having a stop surface thereon positionable to engage the leading edge of a sheet forwarded through the sheet-registering station whereby the leading edge of the sheet is registered against said stop surfaces, a pair of drive rolls secured to said shaft being coaxially aligned with said register rolls and being arranged to rotate with said shaft, drive means to rotate said shaft at a rate wherein the outer surface of said drive rolls moves at a constant velocity, means to hold a sheet registered stop surfaces in pressure contact against the surface of said register rolls for a predetermined period of time, control means to rotate said register rolls in a direction wherein the stop surfaces are moved out of sheet engagement and a sheet registered against the stops is accelerated to said constant velocity during the period in which the sheet is held In pressure contact against said register rolls, and means to place the sheet moving at said constant velocity into pressure contact with the drive rolls wherein the sheet is forwarded from said sheet-registering station at said constant velocity.
Claim 8
Dependent Claim
234 words
In a copying apparatus of the type wherein individual cut sheets of support material are forwarded one at a time through a sheet-registering station, the apparatus including a shaft journaled for rotation in the sheet-registering station, a pair of register rolls mounted to rotate freely upon said shaft, each of said rolls having a stop surface thereon positionable to engage the leading edge of a sheet forwarded through the sheet-registering station whereby the leading edge of the sheet is registered against said stop surfaces, a pair of drive rolls secured to said shaft being coaxially aligned with said register rolls and being arranged to rotate with said shaft, drive means to rotate said shaft at a rate wherein the outer surface of said drive rolls moves at a constant velocity, means to hold a sheet registered stop surfaces in pressure contact against the surface of said register rolls for a predetermined period of time, control means to rotate said register rolls in a direction wherein the stop surfaces are moved out of sheet engagement and a sheet registered against the stops is accelerated to said constant velocity during the period in which the sheet is held In pressure contact against said register rolls, and means to place the sheet moving at said constant velocity into pressure contact with the drive rolls wherein the sheet is forwarded from said sheet-registering station at said constant velocity.
Claim 9
Dependent Claim
35 words
The apparatus of claim 6, wherein said control means associated with the register rolls is arranged to accelerate and forward a sheet in engagement therewith in less than one complete revolution of said register rolls.
Claim 10
Dependent Claim
31 words
The apparatus of claim 7, further including guide means arranged to direct sheets forwarded from a plurality of sheets supply stacks into engagement with said stop faces on said register rolls.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |