초록 ▼

Longitudinally spaced pairs of laterally spaced openings are formed in a web of material prior to the web being folded into a pouch having a gusset bottom, the holes enabling the side panels of each pouch to be heat-sealed directly together at the side margins of the pouch and in the area of the gus

Longitudinally spaced pairs of laterally spaced openings are formed in a web of material prior to the web being folded into a pouch having a gusset bottom, the holes enabling the side panels of each pouch to be heat-sealed directly together at the side margins of the pouch and in the area of the gussets. To enable the lateral spacing between the openings of each pair to be easily changed and to enable the openings to be located extremely close to the longitudinal centerline of the web, the openings are formed by punches supported by separate punch frames which may be independently adjusted in a direction laterally of the web. The punch frames also are adjustable relative to one another in a direction longitudinally of the web in order to enable the machine to make pouches of various widths.

대표청구항 ▼

[ I claim:] [1.] An apparatus for forming a pouch with a gusseted bottom from a continuous web as the web is longitudinally advanced in step-by-step fashion by incremental distances substantially equal to a pouch width, the pouch having opposed pairs of first and second openings through gusset membe

[ I claim:] [1.] An apparatus for forming a pouch with a gusseted bottom from a continuous web as the web is longitudinally advanced in step-by-step fashion by incremental distances substantially equal to a pouch width, the pouch having opposed pairs of first and second openings through gusset members formed near a web centerline so that after folding along the centerline the openings allow side walls to be joined through the gusset members, the apparatus including a punching mechanism for forming the opposed pairs of first and second openings, the punching mechanism comprising:a support;first and second punch means mounted on said support and longitudinally separated from one another by a distance substantially equal to the pouch width, the first and second punch means being operable to punch the first and second openings respectively as the web is incrementally advanced;the respective punch means being laterally spaced from the web centerline in opposite directions at substantially equal distances and adjustable laterally with respect to the centerline so that a first opening formed by the first punch is positioned to register with a second opening formed by the second punch when the gusseted pouch is folded; andmeans for longitudinally advancing the web.