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US 4,068,566 AGranted
Universal bag-making machine
OwnerRichard L. Joiceinventor
Life of this patent
Estimating the term…
Abstract
The web in the bag-making machine is continuously advanced from the web letoff to the takeup. At the operations station of the machine where operations take place on the web, the web is momentarily held stationary for operating thereon. A pair of swinging web control arms take up web at the entrance end of the station and let off web at the exit end during the moment at which the web is stationary. Operations take place when the web is stationary. Adjustments control length of time the web is stationary. Sealing and perforating operations are selectable.
Claims21
A bag-making machine comprising:
- means for advancing a web of tubular synthetic polymer composition material from a source at a substantially constant rate;
- first and second web control arms, each of said control arms being pivoted on its own separate pivot axis and spaced from each other in parallel with each other so as to pivot in the same direction with respect to the advancing web, each of said control arms carrying guide rollers thereon for guiding the web and for engaging the web for acting on the advancing web to cause the web to dwell at an operation station positioned between said first and second web control arms so that operation can be performed on the web at the operation station;
- means positioned at said operation station for acting on said web, said means for acting on said web having power means thereon;
- and
- detecting means for detecting the position of said web control arms and connected to said power means for energizing said power means so that an operation is performed on the web when the web dwells at said operation station.
2 more elements
A bag-making machine comprising:
- means for advancing a web of tubular synthetic polymer composition material from a source at a substantially constant rate;
- means comprising first and second web control arms engaging the web for acting on the advancing web, each of said first and second control arms being pivoted on a pivot axis so that each said web control arms swings about its own pivot axis, each of said control arms carrying a guide roller rotatable thereon on its pivot axis and carrying a guide roller thereon away from said pivot axis for guiding the web to cause the web to dwell between said first and second control arms;
- and
- an operation station positioned between said first and second control arms so that operations can be performed on the web during dwell of the web.
1 more element
Dependencies are inferred from the claim text.