Punching attachment for bag making machine
Secured to a plastic bag making machine so that the operating ends of the blade and punch project toward a stationary, horizontal support surface across which overlapping plastic webs pass during bag manufacturing. The webs are secured against movement during a slitting and punching operation by a pressure plate, which is also mounted on the piston rod for movement thereby into engagement with the plastic webs to clamp them against the stationary support surface during the initial advance of the rod. As the rod continues to advance it moves the blade and punch through the now-clamped plastic webs, after which the piston rod is retracted and the parts return to their inoperative positions.A web clamping, slitting and punching device for plastic bag making machines of the type having a stationary web supporting surface across which each of two overlapping webs of plastic, bag-making film travel during the manufacture of bags on said machine, comprising
A first bracket disposed to be removably fixed to said machine adjacent one side thereof ,A web clamping, slitting and punching device as defined in claim 4, including guide means interposed between said clamping plate and said lateral projection on said second bracket and operative to guide said clamping plate for reciprocable movement relative to said lateral projection upon reciprocation of said piston rod.means releasably securing a fluid pressure-operated cylinder over an opening in said lateral projection, said cylinder having a reciprocable piston rod which extends at one end thereof through said opening and toward said web supporting surface,In a plastic bag making machine of the type described in claim 9, whereinsaid parallel rods are tubular and have the bores thereof extending parallel to the axis of said piston rod, and each of a further plurality of rods is secured adjacent one end thereof to said lateral projection o said bracket and extends slidably at the opposite end thereof into the bore in one of said tubular rods.
means resiliently mounting a pressure plate on said one end of said piston rod for reciprocation thereby into and out of clamping engagement with the webs supported on said support surface, said pressure plate having therethrough a pair of adjacent apertures registering with and similar in configuration to said pair of apertures in said web supporting surface, and means releasably securing said web slitting blade and said web hole punch on said piston rod with the operating ends thereof registering with the respective apertures in said web supporting surface and said pressure plate, and operative upon each reciprocation of said piston rod to force the operating ends of said blade and punch through the overlapping webs on said web supporting surface after the webs have been clamped against said surface by said pressure plate.
a fluid pressure-operated cylinder having a reciprocable piston rod projecting from one end thereof, and disposed to be connected to a supply of fluid under pressure operative intermittently to reciprocate said rod between retracted and advanced positions, respectively,
Means releasably mounting said cylinder on said lateral projection on said second bracket with one end of said piston rod extending downwardly beneath said lateral projection,means removably mounting a slitting blade and a hole punch on said one end of said rod for reciprocation by said rod between retracted positions in which the operating ends of said blade and punch are disposed in spaced, confronting relation to said stationary web supporting surface and the webs passing thereover, and advanced positions in which said operating ends of said blade and punch engage and pass through said webs and into registering opening in said stationary web supporting surface, andweb clamping means resiliently supported on said one end of said rod adjacent said blade and punch and having thereon a clamping surface overlying said web supporting surface normally to be spaced therefrom when said rod is in its retracted position,In a plastic bag making machine of the type defined in claim 7, guide means interposed between said bracket and said pressure plate and operative to guide said pressure plate for reciprocation in a predetermined path upon reciprocation of said piston rod.
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