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Punch Programmer With Magnetic Retract

IP.com Disclosure Number: IPCOM000047569D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 3 page(s) / 46K

Publishing Venue

IBM

Related People

Coneski, AF: AUTHOR [+3]

Abstract

An arrangement is described to improve the punch head design employed in the programmable punching scheme described in. The earlier punching system utilizes a punch head assembly design employing a pair of solenoid-type actuating devices, one for advancing the punch head and one for retracting the punch head. One of the difficulties encountered in the above double-solenoid-type punch head assembly resides in the fact that the solenoids do not operate reliably. The lack of reliability is caused, at least in part, by the fact that the arrangement exhibits weak starting forces resulting sometimes in failure to extend or retract on command. Moreover, utilization of two solenoids, one to hold the punch in the retracted position and the other to extend the punch, results in the generation of a substantial amount of heat.

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Punch Programmer With Magnetic Retract

An arrangement is described to improve the punch head design employed in the programmable punching scheme described in. The earlier punching system utilizes a punch head assembly design employing a pair of solenoid-type actuating devices, one for advancing the punch head and one for retracting the punch head. One of the difficulties encountered in the above double-solenoid- type punch head assembly resides in the fact that the solenoids do not operate reliably. The lack of reliability is caused, at least in part, by the fact that the arrangement exhibits weak starting forces resulting sometimes in failure to extend or retract on command. Moreover, utilization of two solenoids, one to hold the punch in the retracted position and the other to extend the punch, results in the generation of a substantial amount of heat. The generation of this heat and the selection of improper materials resulting in rapid deterioration of the punch head assembly also reduces reliability. The double-solenoid programmable punching scheme of [*] is shown in Fig. 1. Chrome-plated upper iron pole piece 1 acts with coil 3 to hold the chrome-plated iron plunger 5 in a retracted position. Lower chrome-plated iron pole piece 7 responds to the energization of coil 9 to extend plunger 5 downwardly. As shown, carbide rod 11 connected to iron plunger 5 acts when extended to engage carbide punch 13 and the latter, in turn, acts to punch green sheet material positioned in the spacing 15. Fig. 2 shows the arrangement in accordance with the subject disclosure wherein iron pole piece 1 and coil 3 are replaced by permanent magnet 17. A nickel-plated iron flux ring 18 is positioned beneath permanent magnet 17. Chrome-plated iron pole piece 7' responds to the energization of coil 9' in the same manner as described with respect to Fig. 1. In order to minimize deterioration, iron plunger 5' is chrome- plated while iron flux ring 18 is nickel-plated and shell 19 is nickel-plated steel. In the same manner as described with regard to Fig. 1, carbide rod 11 is coupled to iron plunger 5 and acts to activate carbide punch 13. As can be seen, punch retract plate 21 acts to remove carbide punch 13 when coil 9' is de-...