Thin sheet thrower |
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| 申请号 | US3674256D | 申请日 | 1971-03-29 | 公开(公告)号 | US3674256A | 公开(公告)日 | 1972-07-04 |
| 申请人 | WEYERHAEUSER CO; | 发明人 | BROOKHYSER BYRON B; | ||||
| 摘要 | An apparatus particularly suited for the layup of plywood panels operates to position an individual sheet of veneer over an increasing stack of such veneer sheets. The positioning apparatus consists of a pivoting sheet thrower which is actuated by a hydraulic cylinder to impart an amount of momentum to the veneer sheet sufficient to throw it outwardly over an upwardly inclined tipple. As the veneer sheets leave the end of the tipple they will have a trajectory that is slightly inclined from the horizontal thus tending to prevent bending and which facilitates the placement of each sheet atop the veneer stack. | ||||||
| 权利要求 | 1. A positioning apparatus for thin sheets comprising: a substantially rigid frame having at least two spaced apart structural portions, a pivotally mounted sheet thrower positioned between said structural portions and having a cradle portion for the acceptance of said thin sheets, means to charge said thin sheets into said cradle portion, means to pivot said sheet thrower through an angle, means to accept said thin sheets as they are thrown outwardly by said sheet thrower, and means to direct said thin sheets to said sheet accepting means as they are thrown outwardly by said sheet thrower. 2. The positioning apparatus as in claim 1 in which said sheet charging means includes: conveying means positioned axially upstream from said sheet thrower, a vertically extending backstop positioned to halt the forward movement of an incoming thin sheet, and a pivotal tipple adjacent said backstop arranged and adapted to pivot upwardly as each thin sheet impacts against said backstop. 3. The positioning apparatus as in claim 2 in which said sheet directing means includes said pivotal tipple in its upwardly extending position arranged so as to allow each thin sheet to be thrown over the top of said backstop at an angle inclined from the horizontal. 4. The positioning apparatus as in claim 1 in which said sheet thrower pivoting means includes an actuating cylinder extending from said rigid frame to said sheet thrower arranged and adapted to pivot said sheet thrower through said angle. 5. The positioning apparatus as in claim 1 in which said sheet accepting means includes: a stacking table positioned axially downstream from said sheet thrower, a vertically extending airstop positioned adjacent the downstream side of said stacking table, and a vertically extending secondary backstop positioned adjacent the upstream side of said stacking table. |
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