Composite tape laying apparatus and method
A fully automated method and apparatus is disclosed to laminate various structural articles with a layer of resin impregnated fiber tape. The tape laying member removes a releasable backing layer from the tape being employed, then deposits the unbacked tape on the surface of the structural article, and finally severs the end of the tape being deposited. An automated cut and restart procedure is employed in the present tape laying member to increase tape throughput.
1. An automated cut and restart apparatus to form a composite laminated structural shape having multiple deposited surface layers of resin impregnated tape formed with continuous fibers selected from the group consisting of ceramics, metals, carbon, glass compositions and organic polymers which have been preimpregnated with a resin binder and provided with a releasable backing layer comprising:
(a) a laterally moving head member to continuously apply the resin impregnated tape to the surface of said structural shape with compaction roller means, said head member further having a pair of operationally cooperating mechanisms physically incorporated in said head member to first remove the backing layer from the applied tape while being continuously fed to the structural shape and thereafter sever a predetermined length of the unbacked tape from a tape supply while still being continuously fed from said head member,
(b) said backing layer removal mechanism having means enabling separation of said backing layer from the tape while further continuously accumulating the removed backing layer in said head member,
(c) said tape severing mechanism also physically incorporated in said head member including mechanical cutter means which cooperate with pinch roller means enabling forward tape movement when being fed while preventing backward tape movement during tape severance with said cutter means, and
(d) associated electrical control means to operate said head member in an automated sequential manner.
2. The apparatus of claim 1 wherein said head member is automatedly moved forward from a start position to apply a first strip of resin impregnated tape to the structural shape then moved to a next start position for placement of another strip as directed by said associated electrical control means.
3. The apparatus of claim 1 wherein the head member is capable of receiving the resin impregnated tape before automated operation is initiated.
4. The apparatus of claim 3 wherein the head member is capable of receiving a trimmed resin impregnated tape.
5. The apparatus of claim 2 wherein the resin impregnated tape being employed is supplied from a spool incorporated in said head member.
6. The apparatus of claim 5 wherein the spool includes a friction braking mechanism.
7. The apparatus of claim 1 wherein the backing layer being removed is accumulates with a motorized spool incorporated in the head member.
8. The apparatus of claim 1 wherein the cutter means severs the predetermined layer of unbacked resin impregnated tape in a direction substantially perpendicular to the tape feed direction.
9. The apparatus of claim 7 wherein the cutter means severs the predetermined length of unbacked resin impregnated tape in a bias direction with respect to the tape feed direction.
10. The apparatus of claim 1 wherein the cutter means employs a knife blade.
11. The apparatus of claim 10 wherein the cutter means further includes a moving knife blade.
12. The apparatus of claim 11 wherein the cutter means employs a rotating disc knife blade.
13. The apparatus of claim 1 wherein the associated electrical control means includes a program controller.
14. The apparatus of claim 13 wherein the program controller comprises a software programmed computer.