FIELD: mining. SUBSTANCE: device has body, spring-loaded striker with head, trigger mechanism and register, pressing roller and two supporting rollers, one of which is driving. Attached to driving roller parallel and symmetrical to its axis are cocking pins. Body is made in form of long frame located on which are rollers and spring-loaded striker with lateral boss for interaction with cocking pins. Register is made in form of mechanic-electrical converter secured to striker. EFFECT: higher efficiency. 3 cl, 1 dwg
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