Apparatus configured to manufacture a roll of interleaved bags
In an embodiment of the invention, a cut/weld apparatus is configured to provide optimal and limited tension of bag material even during high-speed operation. The limited tension may contribute to stronger plastic welds. Another embodiment of the invention, which may be used in combination with the first embodiment, provides a roll discharge stage in a bag manufacturing apparatus that includes a retracting spindle and may include a rotating tray. The improved discharge stage requires less floor space than conventional side-discharge manufacturing equipment.
1. A bag manufacturing apparatus comprising:
a cutting knife configured to cut a folded film;
a first inside holding knife disposed proximate to the cutting knife on a first side of the cutting knife, the first inside holding knife configured to hold the folded film;
a second inside holding knife disposed proximate to the cutting knife on a second side of the cutting knife, the second inside holding knife configured to hold the folded film;
a contact welding bar configured to communicate with the folded film, the first inside holding knife being disposed between the contact welding bar and the cutting knife;
a first outside holding knife disposed proximate to the contact welding bar on a side opposite the first inside holding knife;
a second outside holding knife disposed proximate to the cutting knife on a side opposite the second inside holding knife;
an accumulation module including a spindle configured to accumulate a roll of interleaved bags during an accumulation mode, the spindle further configured to retract from the roll of interleaved bags along a long axis of the spindle during a spindle retraction mode, a surface of the spindle having a plurality of holes, the accumulation module configured to provide a vacuum at each of the plurality of holes during the accumulation mode, the accumulation module further configured to provide an exhaust at each of the plurality of holes during the spindle retraction mode;
a 3-way pneumatic valve having a first port, a second port, and a third port, the spindle coupled to the second port;
an actuator coupled to the 3-way pneumatic valve; and
an air supply coupled to the first port, the actuator configured to switch the 3-way pneumatic valve between the accumulation mode and the spindle retraction mode.
2. The bag manufacturing apparatus of claim 1 , the accumulation module further including a tray, the tray configured to communicate with the roll of interleaved bags during the spindle retraction mode.
3. The bag manufacturing apparatus of claim 2 , the tray configured to rotate approximately 90 degrees with respect to the long axis of the spindle subsequent to operation of the spindle retraction mode.