Method and apparatus for opening bags while maintaining a continuous strip of bag precursors

摘要

Transforming machines for changing a strip of unopened bag precursors into open bag precursors are disclosed that include a drive motor, a separation station, a sensor electrically connected to a controller that is electrically connected to components of the separation station. The separation station includes a first roller, a separation roller driven by the drive motor, and a pressure device having an actuator selectively activating the pressure device to apply pressure to the strip of unopened bag precursors passing over the first roller. In operation, the controller, based on a signal from the sensor, determines when perforations are located in a gap between the pressure device and the separation roller and at that time signals the actuator to activate the pressure device, with the drive motor driving the separation roller, thereby separating the perforations in a first film layer, but not the perforations in a second film layer.

主权项

1. A transforming machine for changing a strip of unopened bag precursors into a strip of open bag precursors comprising:
a drive motor; a separation station comprising:
a first roller positioned to contact the strip of unopened bag precursors;a separation roller rotatably driven by the drive motor and positioned relative to the first roller to squeeze a continuous strip of bag precursors therebetween; anda pressure device having an actuator selectively activating the pressure device to apply pressure to the continuous strip of unopened bag precursors as the continuous strip of unopened bag precursors passes over the first roller;wherein the pressure device is positioned relative to the separation roller to define a gap therebetween; a sensor and a controller electrically connected to the sensor and electrically connected to the actuator of the pressure device; wherein the controller, based on one or more signals from the sensor, determines when perforations in one perforated bag precursor of the continuous strip is located in the gap between the pressure device and the separation roller and at that point in time signals the actuator to activate the pressure device, while the drive motor continues to drive the rotation of the separation roller, thereby separating the perforations in a first film layer, but not the perforations in a second film layer, of the continuous strip of bag precursors.