초록 ▼

A feeder for paperboard blanks includes a transport, vertical relationship changing structure to alternately provide action and passive positions for the transport, a suction device, and a transmission with input and output shafts operatively connected so that the output shaft undergoes controlled a

A feeder for paperboard blanks includes a transport, vertical relationship changing structure to alternately provide action and passive positions for the transport, a suction device, and a transmission with input and output shafts operatively connected so that the output shaft undergoes controlled acceleration during an initial portion of each revolution of the input shaft and is stationary during a last portion of each revolution of the input shaft, whereby the transport engages and grips a blank by static friction and moves and accelerates that blank to nip rolls without slippage occurring and so that each blank enters the nip rolls in register whereupon the blank is disengaged from the transport.

대표청구항 ▼

Apparatus for feeding corrugated blanks one by one from the bottom of a stack of blanks without slippage and so that the leading edge of the blank being fed always enters the nip of nip rolls at the same point in the machine cycle with precision suitable for printing and slotting, said apparatus com

Apparatus for feeding corrugated blanks one by one from the bottom of a stack of blanks without slippage and so that the leading edge of the blank being fed always enters the nip of nip rolls at the same point in the machine cycle with precision suitable for printing and slotting, said apparatus comprising a. nip rolls adapted to be operated with a surface velocity; b. stack supporting structure including a forward portion; c. transport means supported under said forward portion of stack supporting structure, said transport means comprising a continuous high coefficient of friction surface adapted to be circulated; d. reciprocating means for changing the relative vertical relationship of said high coefficient of friction surface and said forward portion of said stack supporting structure so as to alternately provide an active position where said high coefficient of friction surface extends above the top of said stack supporting structure forward portion and a passive position where said high coefficient of friction surface does not extend above the top of said stack supporting structure forward portion; e. suction means for urging a blank downwardly into engagement with said high coefficient of friction surface in the active position; f. transmission means comprising input shaft means which is adapted to be rotate and output shaft means which is adapted to be rotated; g. means operatively connecting the output shaft means of the transmission means and the transport means so that during a portion of the operation of the apparatus said high coefficient of friction surface is circulated in a feed direction and undergoes controlled acceleration to said surface velocity; the apparatus being such that the active position is effected at a time before said high coefficient of friction surface undergoes said controlled acceleration and the passive position is effected at the conclusion of the controlled acceleration; whereby said high coefficient of friction surface of said transport means initiates feeding the lowermost blank in the feed direction by static friction where said high coefficient of friction surface and said blank are in contact at zero velocity and moves and accelerates that blank to the nips rolls without slippage occurring and so that each blank enters the nip rolls in register whereupon the blank is disengaged from the transport means.