Abstract A web supply apparatus of the type wherein web is unwound alternately from each of two similar mobile roll stands each movable in the direction of its web roll axis between an unwind position usually in line with a web consuming machine and a loading position laterally offset from the path of the web. The two roll stands generally move on floor supported tracks between their loading and unwind positions and each is equipped with a portion of a web splicing device so constructed that, in the loading position a ready web roll having been picked up from the floor has its leading end so prepared and mounted that when the ready roll stand is moved to the unwind position, the ready web may be spliced automatically to the trailing end of the running web by the co-action of the two splicer halves mounted on the unwinding and ready roll stands. A compact knife assembly is provided wherein the knife is secured directly to a fluid powered actuator and is positioned to sever the web at the same point in space regardless of variables in the operation of the splicer.
A web cutting apparatus comprising an elongated blade, a piston coextensive with the blade upon which the blade is mounted, means for removably securing the blade to the piston, a housing in which the piston is slidable and from the open end of which the blade is projectable, means for introducing fluid under pressure between the piston and the closed end of the housing to project the blade from the open end of the housing and into cutting engagement with adjacent web, guard plates partially closing the open end of the housing, but allowing the blade to be projected beyond the guard plates and a spring interposed between the guard plates and the piston to cause retraction of the blade when pressurized fluid is exhausted from the housing.
Claim 2
Dependent Claim
128 words
A web cutting apparatus comprising an elongated blade, a piston coextensive with the blade upon which the blade is mounted, means for removably securing the blade to the piston, a housing in which the piston is slidable and from the open end of which the blade is projectable, means for introducing fluid under pressure between the piston and the closed end of the housing to project the blade from the open end of the housing and into cutting engagement with adjacent web, guard plates partially closing the open end of the housing, but allowing the blade to be projected beyond the guard plates and a spring interposed between the guard plates and the piston to cause retraction of the blade when pressurized fluid is exhausted from the housing.