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Electronically Controlled Air Valve for a Punch Head Assembly

IP.com Disclosure Number: IPCOM000046622D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Coneski, AF: AUTHOR

Abstract

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.

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Electronically Controlled Air Valve for a Punch Head Assembly

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. The outputs of the drivers 22 and 24 are connected to solenoids A and B, respectively, of the valve 14. The solenoids A and B are suitably energized from a 12-volt supply. The S3 decelerating switch is connected to a standard single-shot 26, including appropriate timing circuitry 28. As the head 10 is driven down by air pressure initiated by the solenoid A, the decelerating switch S3 is momentarily engaged to fire the single-shot 26. The driver 24 responds to the single-shot and cancels the down pressure, with the remaining air pressure serving as a brake to the fall of the punch head. The brake is on for the duration of the pulse supplied by the single-shot. The timing circuitry...