Web feeding, cutting and dispensing machine

Details Web feeding, cutting and dispensing machine Web feeding, cutting and dispensing machine

1989-06-20

1991-06-04

Eley, Timothy V.

Cutting

With means to control or modify temperature of apparatus or...

Of tool

29417, 83236, 83262, 83282, 226115, B26D 900

Patent

active

050204033

ABSTRACT:
A web feeding, cutting and dispensing machine includes a pneumatic cylinder for moving a hot wire to cut measured-length sheets from web stock. A pneumatic clamp cylinder moves a clamp bar for momentarily clamping the web during cutting. Upon pressing a start button, a pneumatic control valve sequentially operates the respective cutting and clamping cylinders for quickly retracting the hot wire, while more slowly retracting the clamp. Conversely, after the next measured web length has advanced, this control valve again sequentially operates these two cylinders in reverse order for quickly clamping while slower cutting. This dual control by one valve is advantageously achieved (1) by throttling air flow in retracting the clamp cylinder relative to retracting the cut cylinder, and conversely (2) by throttling air flow in advancing the cut cylinder relative to advancing the clamp cylinder. A compact machine has a hollow movable clamp bar torque member for equally driving both clamp arms by one clamp cylinder at one side of the machine. This movable clamp bar also serves as a passageway containing a torque shaft for equally driving both cutting arms by one cut cylinder at the other side. A "floating" upper feed roll accommodates different thicknesses of foam web without requiring adjustment and enables a lower feed roll to rotate continuously regardless of whether the web is clamped or not. Each cut sheet is conveniently held by a holder ready for use and is gently removable from the holder.

REFERENCES:
patent: 4151770 (1979-05-01), D'Angelo et al.
patent: 4207667 (1980-06-01), D'Angelo et al.
patent: 4429602 (1984-02-01), Vits
patent: 4699031 (1987-10-01), D'Angelo et al.

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