| 摘要 |
A device for centering the printing of strip material, especially in apparatuses for feeding of such strip in the form of V-shaped labels capable of being associated with a continuous thread for use in machines for the automatic production of small filter bags for infusion products, in which said strip having printed motifs possesses, between said printed motifs, a recurring motif at a spacing equal to the length of the labels which are to be produced, and the feed means for such strip of said feed apparatus are constituted of two counter-rotating rollers having vertical axes, one of which is a following roller of resilient material and the other a driving roller of hard material having a driving surface of circular sector form for contact with the first roller. Said driving roller of circular sector form is rotatably mounted on a two-armed lever oscillating about a vertical axis, which lever, under an elastic action, encounters a screw-mounted element governed by electromagnetic actuating means subject to the control of means for reading and/or detecting the position of the recurring motifs between the printed motifs of the strip.
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