| 摘要 |
506,001. Applying patches by adhesion to envelope blanks. SMITHE MACHINE CO., Inc., F. L. Nov. 19, 1937, No. 31940. Convention date, Jan. 6. [Class 73] [Also in Group XVII] In an envelope-making machine in which window patches are severed from strip material and applied to envelope blanks, the blanks B<1>, B<11> . . . , with the cut-out window apertures gummed, are fed from the left, Fig. 3, by rolls C, gripped at X to clear the adhesive. Cut patches W, severed from a strip S, are taken by a suction sector T, rotating at a variable speed, and pressed on to the blanks which are fed to the right, Fig. 3, by rolls R<11>, R<3> to conveyer chains C<11> to folding &c. mechanism: The strip S, led through a spring-biassed tension device M, is fed by a rotor R with which cooperates a belt 12, running over pulleys 25, 26, the rotor being driven at variable speed, by a constant speed mechanism, such that substantially a moment of dwell of the web S is provided during the operation of the shears 15, 16. Fingers 81, carried adjustably by a rod 83, guide the leading end of the strip 5 between the shears, which are cam operated, the web being tensioned by the suction sector T on co-operating feed sector E geared therewith, immediately before and during severing by the shears. The drive means for the patch material is adjustable so that larger or smaller patches may be severed. Specification 460,367, [Group XVII], is referred to. |
