US3829085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet feeding apparatus
Assignee: Heidelberger Druckmaschinen AG
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Filing: 1972-07-12
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Granted: 1974-08-13
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Expires: 1992-07-12
Abstract
Abstract Apparatus for feeding sheets includes a feed table onto which the sheets are supplied. The front edges of the sheet are engaged by stops, and suction openings in the feed table precede the stops. Suction conduit means which underlie the feed table in alignment with the suction opeings are operable between raised and lowered positions in sychronism with the operation of the apparatus whereby the underpressure applied to a sheet through the suction openings and suction conduit to hold down the sheet on the feed table is varied in synchronism with the operation of the apparatus as the feed conduit means is raised and lowered.
Inventors
- 👤 W Jeschke
- 👤 G Pollich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:51
CPC Classifications
B; B65; B65H; B65H9/00; B65H9/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
174 words
Apparatus for feeding a succession of sheets comprising a feed table receiving said sheets, stop means at the front end of said feed table engaging the front edge of said sheets, suction opening means formed in said feed table preceding said stop means, suction conduit means having an open suction end located beneath said suction opening means in said feed table, said suction opening means comprising holes in said table smaller than said suction end of said suction conduit means so that said suction end does not come in contact with said sheets, and actuating means for raising and lowering said suction conduit means so that said open suction end thereof travels between a lowermost and an uppermost position thereof located below said feed table in synchronism with the operating cycle of the apparatus, whereby the underpressure applied from said open end of said suction conduit means through said suction opening means to the sheet to hold the latter down on said feed table is varied in synchronism with the operation of the apparatus.
Claim 2
Dependent Claim
174 words
Apparatus for feeding a succession of sheets comprising a feed table receiving said sheets, stop means at the front end of said feed table engaging the front edge of said sheets, suction opening means formed in said feed table preceding said stop means, suction conduit means having an open suction end located beneath said suction opening means in said feed table, said suction opening means comprising holes in said table smaller than said suction end of said suction conduit means so that said suction end does not come in contact with said sheets, and actuating means for raising and lowering said suction conduit means so that said open suction end thereof travels between a lowermost and an uppermost position thereof located below said feed table in synchronism with the operating cycle of the apparatus, whereby the underpressure applied from said open end of said suction conduit means through said suction opening means to the sheet to hold the latter down on said feed table is varied in synchronism with the operation of the apparatus.
Claim 3
Dependent Claim
32 words
Apparatus according to claim 1 wherein said suction conduit means comprises a suction conduit having one longitudinal end thereof arranged in underlying alignment with said suction opening means in said feed table.
Claim 4
Dependent Claim
47 words
Apparatus according to claim 2 wherein a plurality of groups of suction opening means are provided in said feed table and each group has a suction conduit associated therewith, the axes of said suction conduits being disposed generally perpendicular to the top surface of said feed table.
Claim 5
Dependent Claim
44 words
Apparatus according to claim 1 wherein said actuating means comprises a pivotal lever for operating said stop means, said suction conduit means being mounted on said lever whereby said stop means are operable simultaneously with the raising and lowering of said suction conduit means.
Claim 6
Dependent Claim
24 words
Apparatus according to claim 4 further comprising cam means Operating said pivotal lever in synchronism with the operating cycle of the sheet feeding apparatus.
Claim 7
Dependent Claim
36 words
Apparatus according to claim 1 wherein a plurality of suction opening means and suction conduit means are provided and means are provided for controlling the suction pressure in one or more of said suction conduit means.
Claim 8
Dependent Claim
149 words
Apparatus for feeding a succession of sheets comprising a feed table receiving said sheets, stop means at the front end of said feed table engaging the front edge of said sheets, suction opening means in said feed table preceding said stops, suction conduit means underlying said suction opening means in said feed table, and actuating means for raising and lowering said suction conduit means relative to said feed table in synchronism with the operating cycle of the apparatus, whereby the underpressure applied to the sheet to hold the latter down on said feed table is varied in synchronism with the operation of the apparatus, said suction opening means comprising a disc having a plurality of openings, said feed table having a recessed opening in which said disc is received, said disc being positioned such that the top surface thereof is flush with the top surface of said feed table.
Claim 9
Dependent Claim
149 words
Apparatus for feeding a succession of sheets comprising a feed table receiving said sheets, stop means at the front end of said feed table engaging the front edge of said sheets, suction opening means in said feed table preceding said stops, suction conduit means underlying said suction opening means in said feed table, and actuating means for raising and lowering said suction conduit means relative to said feed table in synchronism with the operating cycle of the apparatus, whereby the underpressure applied to the sheet to hold the latter down on said feed table is varied in synchronism with the operation of the apparatus, said suction opening means comprising a disc having a plurality of openings, said feed table having a recessed opening in which said disc is received, said disc being positioned such that the top surface thereof is flush with the top surface of said feed table.
References Cited (Backward Citations)
US2753184A
Cited
US3140030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |