Patent US3866764A successfully refreshed from Google Patents.
US3866764A
Expired / Lapsed
US
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Apparatus for the single withdrawal of articles in sheet form from a stack
Assignee: STRAUSAK AG
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Filing: 1972-06-06
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Granted: 1975-02-18
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Expires: 1992-06-06
Abstract
Abstract This invention relates to an apparatus for the single withdrawal of articles in sheet form from a stack, especially for picture postcard vending machines, having a suction device connected to a vacuum pump and movable to and fro in the direction of the stack and a drive device for the advance and withdrawal of the suction device.
Inventors
- 👤 Hermann Leiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:15
CPC Classifications
B; B65; B65H; B65H3/00; B65H3/08; B65H3/0808; G; G07; G07F; G07F11/00; G07F11/02; G07F11/04; G07F11/16; G07F11/165; G07F11/1657
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
310 words
An apparatus for the single withdrawal of articles of sheet from a stack, especially for picture postcard vending machines, having a suction device connected to a vacuum pump and movable to and fro in the direction of the stack and a drive device for the advance and retraction of the suction device, characterized in that: the suction drive comprises two suction cups which are so arranged in relation to the stack that the first suction cup comes to act in the middle part and the second cup comes to act adjacent the edge of the article of sheet to be withdrawn, and in that the drive device includes a longitudinally movable guided drive rod; and in that the suction device includes a cross-carrier connected to an end of the drive rod and extending transversely from the drive rod, a pivot arm pivotally connected to the cross-carrier and movable in a plane determined by the axes of the suction cups, stops limiting the pivoting range of the pivot arm, and a spring connected to the cross-carrier and the pivot arm for pressing the pivot arm toward the stack end of the pivoting range, the first suction cup being located on the pivot rod substantially in coaxial alignment with the drive rod, and the second suction cup being located adjacent the pivotal connection of the cross-carrier to the pivot arm, the axis of the second suction cup being parallel to the drive rod, whereby the drive device is operatively connected to the suction device to provide a limited amount of idle motion between the drive device and the first cup during the beginning of the retraction of the suction device in the withdrawal movement direction, so that the second suction cup is firstly retracted alone, thus lifting the edge of the article of sheet form away from the stack before its withdrawal.
Claim 2
Independent Claim
310 words
An apparatus for the single withdrawal of articles of sheet from a stack, especially for picture postcard vending machines, having a suction device connected to a vacuum pump and movable to and fro in the direction of the stack and a drive device for the advance and retraction of the suction device, characterized in that: the suction drive comprises two suction cups which are so arranged in relation to the stack that the first suction cup comes to act in the middle part and the second cup comes to act adjacent the edge of the article of sheet to be withdrawn, and in that the drive device includes a longitudinally movable guided drive rod; and in that the suction device includes a cross-carrier connected to an end of the drive rod and extending transversely from the drive rod, a pivot arm pivotally connected to the cross-carrier and movable in a plane determined by the axes of the suction cups, stops limiting the pivoting range of the pivot arm, and a spring connected to the cross-carrier and the pivot arm for pressing the pivot arm toward the stack end of the pivoting range, the first suction cup being located on the pivot rod substantially in coaxial alignment with the drive rod, and the second suction cup being located adjacent the pivotal connection of the cross-carrier to the pivot arm, the axis of the second suction cup being parallel to the drive rod, whereby the drive device is operatively connected to the suction device to provide a limited amount of idle motion between the drive device and the first cup during the beginning of the retraction of the suction device in the withdrawal movement direction, so that the second suction cup is firstly retracted alone, thus lifting the edge of the article of sheet form away from the stack before its withdrawal.
Claim 3
Dependent Claim
54 words
An apparatus according to claim 1, characterized in that the retraction force exerted upon the suction device by the drive device at the beginning of the withdrawal movement is less during the single movement of the second suction cup than after the commencement of the action of the force upon the first suction cup.
Claim 4
Dependent Claim
165 words
An apparatus according to claim 1 characterized in that the drive device comprises a working cylinder with double-acting piston, the piston being connected with the drive rod on its forward side facing in the direction of advance, while a suction conduit connected with the suction cups and formed by a passage in the drive rod opens through a passage in the piston into the cylinder chamber on the rear of the piston, further in that the two cylinder chambers are connectable with the vacuum pump through program controlled valves and in that the controlling of the valves for the retraction of the piston and thus of the suction device is arranged in such a way that in a first retraction phase at the beginning of the withdrawal movement of the suction device the two cylinder chambers are connected with the vacuum pump and in a subsequent second retraction phase only the cylinder chamber to the rear of the piston is connected with the vacuum pump.
Claim 5
Dependent Claim
47 words
An apparatus according to claim 3, characterized in that for the advance of the suction device there is provided a balance spring whose force is dimensioned so that in the first retraction phase a resultant force is exerted in the withdrawal movement direction upon the suction device.
References Cited (Backward Citations)
US3411640A
Cited
US3690477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |