Trim press with counterbalance
AssigneeJohn Brown Inc.
InventorsGaylord W. Brown, Albert Arends
Life of this patent
Estimating the term…
Abstract
A trim press for severing articles differentially pressure formed in a thermoplastic sheet comprising a stationary die member and a movable trim die member mounted on a frame for movement toward and away from the stationary trim die member between a spaced apart position and a closed position in which the trim die members engage opposite sides of a sheet to sever the article from the sheet. Dynamically balanced drive mechanism is provided for moving the platen in a to-and-fro path of travel while concurrently oppositely moving a counterbalance weight movably mounted on the frame.
Claims20
A trim press for severing articles which have been differentially pressure formed in a thermoplastic sheet comprising:
- a frame;
- a pair of trim platens, including a pair of trim dies, mounted on said frame;
- one of said trim platens being movably mounted on said frame for movement between a removed position and a closed position in which said trim dies engage opposite sides of a thermoplastic sheet to sever an article from said sheet;
- means for reciprocably moving said one trim platen between said removed position and said closed position including;
- a rotatable drive shaft, having a rotational axis;
- means for rotating said drive shaft;
- coupling rod means pivotally coupled to said one platen and eccentrically coupled to said rive shaft for moving said one platen in a to-and-fro path of travel between said removed position and said closed position as said shaft rotates;
- and
- balance means comprising
- a counterbalance weight;
- means mounting said counterbalance weight on said frame for to-and-fro movement on said frame;
- and
- means pivotally coupled to said counterbalance weight and eccentrically coupled to said drive shaft for moving said counterbalance weight in a direction opposite to, but concurrent with, the to-and-fro movement of said one platen;
- said drive shaft being disposed between said counterweight and said one movable platen.
A dynamically balanced trim press comprising:
- a frame;
- rotatable drive means having a rotational axis;
- a trim die member mounted on said frame for to-and-fro reciprocal movement between a removed position spaced from a trim station and a closed position at said trim station;
- first eccentric means coupled to said trim die member and to said drive shaft for moving said trim die member in said to-and-fro path of travel as said rotatable drive means rotates;
- and
- dynamic balance means comprising a counterbalance weight mounted on said frame for to-and-fro reciprocal movement;
- and
- second eccentric means coupled to said counterbalance weight and eccentrically coupled to said rotatable drive means for concurrently driving said counterbalance weight in a substantially to-and-fro direction opposite the to-and-fro direction of movement of said trim die member;
- said rotational axis being disposed between said counterbalance weight and said trim die member.
A dynamically balanced trim press for severing articles formed in a sheet of plastic comprising:
- a frame;
- a stationary platen mounted on said frame;
- a movable platen mounted on said frame for reciprocal movement in a to-and-fro path;
- first and second opposed trim dies, mounted on said stationary platen and said movable platen;
- dynamically balanced drive means, including counterbalance weight means mounted for to-and-fro movement on said frame, for moving said movable platen between a removed position and a closed position in which said dies engage opposite sides of a sheet of plastic material to sever the articles from said sheet;
- and
- means disposed between and coupled to said movable platen and said counterbalance weight means for concurrently driving said counterbalance weight means and said movable platen in opposite to-and-fro directions of travel.
Dependencies are inferred from the claim text.