Apparatus for trimming the neck of blow molded plastic bottles and method
AssigneeGraham Engineering Corporation
InventorDennis L. Dundas
Life of this patent
Estimating the term…
Abstract
An apparatus for trimming a ring from the neck of a blow molded plastic bottle includes a reverse punch for cutting a ring from the neck and positioning the ring on the punch shaft and a ring stripper for cutting one side of the ring on the punch shaft and pulling the other side of ring from the shaft. The ring stripper includes a hook for engaging the ring and pulling the ring against a blade. The blade severs the ring and the hook then strips the severed ring from the shaft for disposal.
Claims25
An apparatus for trimming a ring from a neck of a blow molded plastic bottle, the apparatus comprising:
- a body;
- a shaft bore extending into the body;
- an anvil bore at an end of the shaft bore;
- a punch shaft in the shaft bore, said punch shaft having an end adjacent the anvil bore, a reverse punch on the end of the punch shaft, the reverse punch dimensioned to have a close fit in the anvil bore;
- a blade on a side of the punch shaft, the blade having a ring edge in the anvil bore;
- a ring discharge passage in the body on an opposite side of the punch shaft across from the blade, said ring discharge passage extending from the anvil bore to an outer surface of the body;
- a ring hook on the opposite side of the punch shaft facing outwardly of the anvil bore, the hook having a first position in the anvil bore adjacent the discharge passage and a second position located outside the anvil bore.
An apparatus for trimming a ring from a neck of a blow molded plastic bottle, the apparatus comprising:
- a body;
- a shaft bore extending into the body;
- an anvil bore at an end of the shaft bore;
- a punch shaft in the shaft bore, said punch shaft having an end adjacent the anvil bore;
- a reverse punch on the end of the punch shaft, said reverse punch having a close fit in the anvil bore;
- a ring cutting blade in the anvil bore on a side of the punch shaft;
- a ring discharge passage in the body on an opposite side of the punch shaft extending from the anvil bore to an outer surface of the body;
- a ring displacement member in the anvil bore between the punch shaft and the ring discharge passage, the displacement member facing the ring discharge passage;
- and a displacement member drive, a member drive connection joining the displacement member and the displacement member drive, the drive moving the displacement member away from the punch shaft, out of the anvil bore and into the ring discharge passage.
A method of trimming a neck of a plastic blow molded bottle using a reverse punch mounted on a punch shaft, the method including the steps of:
- a) extending the reverse punch into the neck of a blow molded plastic bottle;
- b) retracting the reverse punch out from the neck of the bottle to cut a ring of plastic from the neck of the bottle in a single piece and position the trimmed ring on the punch shaft free from the bottle;
- c) moving a lead portion of the ring to a side of the punch shaft to pull a trailing portion of the ring against a blade and cut the trailing portion of the ring while retaining the ring in a single piece;
- and
- d) further moving the lead portion of the ring to the side of the punch shaft to pull the cut trailing portion of the ring to the side of the punch shaft and strip the ring from the punch shaft in a single piece.
Dependencies are inferred from the claim text.