Apparatus for making paperboard pressware with controlled blank feed
An improved apparatus for making pressware features a vacuum belt feeder which accelerates and decelerates a feed blank for controlled insertion into a forming die as well as retainers to limit bounce back of the blank off of forward stops. A pneumatic ejector on the forming ram facilitates product removal.
1. An improved pressing apparatus for making paperboard pressware comprising:
(a) a pressware die set including a punch and a die;
(b) a forming ram upon which the punch is mounted, the forming ram being adapted for reciprocating motion;
(c) the die mounted in an opposed facing relationship with the forming ram;
(d) paperboard blank feeder adapted to provide paperboard blanks to the die,
the pressing apparatus wherein the forming ram reciprocally drives the punch to the die with a paperboard blank therebetween in order to form the pressware and another blank is fed to the die along a blank feed path upon ejection of the formed product; the apparatus being further provided with:
(e) a pneumatic product ejector mounted on the forming ram adapted to output an ejector air stream incident upon formed product in order to facilitate removal of formed product from the die set, the product ejector being disposed such that its output air stream is above and substantially parallel to the feed path and avoids the feed path of the blanks fed to the apparatus and such that the output air stream is adapted to be active while another blank enters a region between the punch and die.
2. The improved apparatus according to claim 1 , wherein the output air stream of the pneumatic product ejector is parallel to the feed path.
3. The improved apparatus according to claim 1 , wherein the ejector air stream is provided by way of a plurality of output holes on a nozzle member mounted on the forming ram.
4. The improved apparatus according to claim 3 , wherein the nozzle member is mounted on an elongate conduit attached to the forming ram coupled to a compressed air source.
5. The improved apparatus according to claim 1 , wherein the die set is a segmented die set.
6. The improved apparatus according to claim 1 , wherein the die set is adapted to form a pressed paperboard container with a generally planar bottom, a first transition portion, a sidewall, a second transition portion and an arcuate outer flange.
7. In a reciprocating apparatus for making pressware from paperboard blanks, the apparatus including a die set with a punch and a die, a forming ram and a paperboard blank feeder adapted to feed blanks to the die set along a blank feed path, an improved method of operating the apparatus comprising providing an ejector air stream that is above and substantially parallel to the feed path and incident on product formed in the die set, the ejector air stream being directed so as to avoid the blank feed path and is adapted to be active while another blank enters a region between the punch and die .
8. The method according to claim 7 , wherein the ejector air stream is parallel to the feed path.
9. The method according to claim 7 , wherein the ejector air stream is an intermittent air stream coordinated with the production process such that it is dormant when the die set is closing to form a product and is active when the die set is opening.