FIELD: mechanical engineering. SUBSTANCE: machine has main and auxiliary rollers positioned in series within key-ways 6 of necks 7 for interacting with pin 5 of connecting rod 4 and sprockets 10,11 of shafts 12,13 which are set on the same axle. Grooves are made in the rollers. The auxiliary rollers has a diameter which is equal to half diameter of the main rollers. Grooves 6 has oval profile and their surfaces, which face the rollers, are provided with closed rectangular shelves for the grooves. EFFECT: enhanced efficiency. 4 dwg
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