US4136865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet feeding apparatus
Assignee: Georg Spiess GmbH
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Filing: 1977-08-19
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Granted: 1979-01-30
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Expires: 1997-08-19
Abstract
Abstract A sheet feeding apparatus with a cross-cutter in front and an arrangement, following the cross-cutter, for forming a series of underlapping sheets with lifting and holding elements in a region between two withdrawal devices driven at different feed speeds. These elements lift the rear end of each sheet to form a lead-in gap for the following sheet. The lift and holding elements are fastened, furthermore, to continually driven transport elements and are kept on a straight path in the engagement area slightly delayed relative to the following withdrawal device. The lift and holding elements are uniformly distributed across the width of the sheet, and are fastened to a strip picked up by chains located on the side. Several strips are provided spaced at sheet-to-sheet spacing. The track of the lift and holding elements descends slightly in the transport direction. The strips connected to the lateral chains are guided in lateral rails which are adjustable.
Inventors
- 👤 Josef Marass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:41
CPC Classifications
B; B65; B65H; B65H29/00; B65H29/66; B65H29/6609; B65H29/6618; B65H29/6636; B65H2301/00; B65H2301/40; B65H2301/44; B65H2301/443; B65H2301/4433; B65H2301/44331; B65H2406/00; B65H2406/30; B65H2406/35; B65H2406/351; B65H2406/3511
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
113 words
A sheet feeding apparatus with a cross-cutter in front; withdrawal devices; means following said cross-cutter for forming a series of underlapping sheets and having lifting and holding elements in a region between two withdrawal devices driven at different feed speeds; said elements lifting the rear end of each sheet to form a lead-in gap for the following sheet; continually driven rotating transport elements; said lifting and holding elements being fastened to said transport elements and being kept on a straight path in the engagement area slightly delayed relative to the following withdrawal device, the effect of said different feed speeds being compensated by a relative movement between said sheets and said holding elements.
Claim 2
Dependent Claim
113 words
A sheet feeding apparatus with a cross-cutter in front; withdrawal devices; means following said cross-cutter for forming a series of underlapping sheets and having lifting and holding elements in a region between two withdrawal devices driven at different feed speeds; said elements lifting the rear end of each sheet to form a lead-in gap for the following sheet; continually driven rotating transport elements; said lifting and holding elements being fastened to said transport elements and being kept on a straight path in the engagement area slightly delayed relative to the following withdrawal device, the effect of said different feed speeds being compensated by a relative movement between said sheets and said holding elements.
Claim 3
Dependent Claim
40 words
The sheet feeding apparatus as defined in claim 1, wherein a plurality lift and holding elements are uniformly distributed across the sheet track width, and including a strip fastened to said elements and attached to chains located on a side.
Claim 4
Dependent Claim
21 words
The sheet feeding apparatus as defined in claim 2, wherein a plurality of said strips are spaced at the sheet-to-sheet spacing.
Claim 5
Dependent Claim
24 words
The sheet feeding apparatus as defined in claim 2, wherein the track of the lift and holding elements descends slightly in the transport direction.
Claim 6
Dependent Claim
32 words
The sheet feeding apparatus as defined in claim 3, including lateral chains and lateral guide rails, said strips being connected to said lateral chains and being guided in said lateral guide rails.
Claim 7
Dependent Claim
15 words
The sheet feeding apparatus as defined in claim 5, wherein said guide rails are adjustable.
Claim 8
Dependent Claim
32 words
The apparatus as defined in claim 1, wherein the speed of said transport elements holding said lift and holding elements is slightly smaller than the operating speed of the following withdrawal device.
Claim 9
Dependent Claim
36 words
The apparatus as defined in claim 1, wherein the difference in said speeds is adjusted so that the lift and holding elements disengage from the sheet rear edge precisely at the end of the engagement section.
Claim 10
Dependent Claim
19 words
The apparatus as defined in claim 3, wherein said strips are connected elastically to respective ones of said chains.
Claim 11
Dependent Claim
25 words
The apparatus as defined in claim 9, including spring means for elastically connecting said strips to said chains; and means for damping said spring means.
Claim 12
Dependent Claim
26 words
The apparatus as defined in claim 1, including mechanical grippers with gripper fingers and gripper support contacted by said gripper fingers for forming said holding elements.
Claim 13
Dependent Claim
20 words
The apparatus as defined in claim 11, including control contour means located on a side for controlling said gripper fingers.
Claim 14
Dependent Claim
14 words
The apparatus as defined in claim 12, wherein said control contour means is adjustable.
Claim 15
Dependent Claim
25 words
The apparatus as defined in claim 11, wherein said gripper fingers have a smooth holding surface and said gripper support has a smooth counter surface.
Claim 16
Dependent Claim
20 words
The apparatus as defined in claim 14, wherein at least one of said surfaces comprises a roller having substantial inertia.
Claim 17
Dependent Claim
98 words
A sheet feeding apparatus with a cross-cutter in front; withdrawal devices; means following said cross-cutter for forming a sequence of underlapping sheets and having lifting and holding elements in a region between two withdrawal devices driven at different feed speeds; said elements lifting the rear end of each sheet to form a lead-in gap for the following sheet; said lifting and holding elements having blow nozzles directed into a gap formed by the sheet to be lifted; a guide surface located above the sheet path; and air shielding means located ahead of the withdrawal device following the cross-cutter.
Claim 18
Dependent Claim
98 words
A sheet feeding apparatus with a cross-cutter in front; withdrawal devices; means following said cross-cutter for forming a sequence of underlapping sheets and having lifting and holding elements in a region between two withdrawal devices driven at different feed speeds; said elements lifting the rear end of each sheet to form a lead-in gap for the following sheet; said lifting and holding elements having blow nozzles directed into a gap formed by the sheet to be lifted; a guide surface located above the sheet path; and air shielding means located ahead of the withdrawal device following the cross-cutter.
Claim 19
Dependent Claim
24 words
The apparatus as defined in claim 16, wherein said blow nozzles have a blow direction opposite to the direction of movement of said sheets.
Claim 20
Dependent Claim
36 words
The apparatus as defined in claim 16, wherein a plurality of adjacent blow nozzles are located across the width of the sheet track and on at least one flap having a guide surface containing blow nozzles.
Claim 21
Dependent Claim
29 words
The apparatus as defined in claim 18, including a a cam disk driven from the cross-cutter, said flap being fastened to a pivoted axis actuated by said cam disk.
Claim 22
Dependent Claim
29 words
The apparatus as defined in claim 19, wherein said axis holding said flap comprises an air supply pipe connected to said blow nozzles through drill holes in said flap.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |