Electronically Controlled Air Valve for a Punch Head Assembly
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Air pressure is electronically controlled for a punch head assembly to prevent collision between the head and a support member for a workpiece. In Fig. 1, a punch head 10 or other mass is driven up or down through an air cylinder 12 and a dual air valve solenoid 14. Solenoids A and B control the application of pressure and the exhaust to the air cylinder in accordance with an electric circuit shown in Fig. 2. A piston 16 in the air cylinder is connected to the punch head 10 through a link 18, an up switch S1, a down switch S2 and a decelerating switch S3. The switches are appropriately operated as the link 18 moves up and down. In Fig. 2, the S1 and S2 switches are coupled through a controller 20 to a set of drivers 22 and 24.