 Premi per ingrandire
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Description
When crosspiece 7 travels downward, pawl 4, actuated by levers 3 and 5, slides over the teeth of ratchet wheel 2 which rotates about fixed axis A. At this, punch member 1 has its down stroke and shaft 9 is stationary. At the instant joint a contacts adjustable stop b, sliding link 5 begins to compress spring 8. During the upward return stroke of punch member 1, link 5 begins its upward stroke only after spring 8 has reached its initial length. After this, pawl 4 engages the teeth of ratchet wheel 2 and turns the wheel together with shaft 9 and a device (not shown) feeds new blanks to the lower die and ejects the finished stampings. Guide 6 is rigidly attached to crosspiece 7. Owing to the action of spring 8, the feed mechanism is engaged at the required instant.
$2779$RG,SF$
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