| 摘要 |
It is characterized in that it comprises a ring (70) with an internal semi-annular collar (71) mounted on and axially fixed to a rear part of a print head supporting sleeve (12) of the print head, opposite the drum, and coupled by means (76, 77) to an adjustment control system (40) mounted to oscillate about the rear part of the drum to couple it to sliding rods incorporating racks and carried by the sleeve.
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