Claims
- 1. A paperboard feeding apparatus comprising: delivery roll means for delivering paperboards piles up between a front guide and a backstop from a lowest layer successively; receiver board means for engaging and releasing contact with between a lowest layer sheet and outer peripheral surfaces of the delivery roll means by ascent and descent of a receiver board; delivery roller indexing means connected to said receiver board means and delivery roll means for selectively setting a rotation start timing of said delivery roll with respect to said ascent of said receiver board in order to determine a start timing of feeding.
- 2. A sheet feeding apparatus comprising:
- hopper means for receiving and piling up a plurality of sheets, said hopper means including a front guide and a backstop;
- delivery means for delivering a lowermost sheet from said hopper along a delivery path, said delivery means including delivery rollers rotating against the lowermost sheet and transporting the lowermost sheet past said front guide;
- receiver board means for moving the lowermost sheet into and out of contact with said delivery rollers, said receiver board means including a receiver board movable into and out of a plane of said delivery rollers, said receiver board means also including elevating means for said moving of said receiver board, said elevating means being selectable in setting said moving of said receiver board into said plane to selectively set a feeding start time of the lowermost sheet, said elevating means also being selectable in setting said moving of said receiver board out of said plane to selectively set a feeding stop time of the lowermost sheet; and
- delivery roller indexing means connected to said delivery roller means and for selectively setting a rotation sheet timing of said delivery rollers to selectively set a delivery start time of said lower most sheet along said delivery path.
- 3. A paperboard feeding apparatus according to claim 2, wherein:
- said elevating means includes an elevating drive shaft rotating through a substantially constant feed angle during every feeding operation of a lowermost sheet, an ascending cam means positioned on said elevating drive shaft and for moving said receiver board out of said plane of said delivery rollers, a descending cam means positioned on said elevating drive shaft and for moving said receiver board into said plane of said delivery rollers; and
- elevating index means for varying a position of said ascending cam means with respect to said descending cam means for a length of the lowermost sheet.
- 4. A paperboard feeding apparatus according to claim 3, wherein said descending cam is fixed on said elevating drive shaft, and said ascending cam is movably mounted on said elevating shaft.
- 5. A paperboard feeding apparatus according to claim 3, wherein said elevating drive shaft rotates at a substantially constant speed.
- 6. A paperboard feeding apparatus according to claim 2, wherein said delivery roller indexing means varies starting of said delivery rollers with respect to said moving of said receiving board into said plane of said delivery rollers.
- 7. A paperboard feeding apparatus according to claim 2, wherein said delivery roller indexing means varies stopping of said delivery rollers with respect to said moving of said receiving board out of said plane of said delivery rollers.
- 8. A paperboard feeding apparatus according to claim 2, further comprising:
- control means connected to said elevating index means and said delivery roller indexing means for varying movement of said receiver board and said starting and stopping of said delivery rollers in response to conditions of the plurality of sheets and the sheet feeding apparatus.
Priority Claims (3)
Number |
Date |
Country |
Kind |
2-71695 |
Jul 1990 |
JPX |
|
2-71696 |
Jul 1990 |
JPX |
|
2-223889 |
Aug 1990 |
JPX |
|
Parent Case Info
This is a divisional application of application Ser. No. 07/724,867 filed Jul. 2, 1991, and now U.S. Pat. No. 5,172,898.
US Referenced Citations (3)
Divisions (1)
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Number |
Date |
Country |
Parent |
724867 |
Jul 1991 |
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