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(11) | EP 0 982 104 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Method and apparatus for moving the circular cutter of a machine for cutting logs of paper and the like |
(57) A transversal cutting machine of logs of paper and the like comprises a saw (3) arranged
pivotally on a support (12), and a drive apparatus for driving the support (12) that
lowers cyclically the saw (3) onto the logs (2) cutting them off into portions. The
drive apparatus is pivoted at two distinct points (12a, 12b) of the support (12) whereby
the saw (3) follows a composite orbit obtained combining two distinct driving movements
given to these points (12a, 12b). The drive apparatus comprises a drive shaft (10),
a first rocking arm (14) having ends pivoted respectively at a first point (12a) of
the support (12) and at a first eccentric point (10a) of the drive shaft (10), and
a crank mechanism (15) comprising a crank (17) pivoted at a second point (12b) of
the support (12) and a second rocking arm (16) pivoted at a second eccentric point
(10b) of the drive shaft (10). The first rocking arm (14) is made of at least two
parts (14a, 14b) which can slide or be locked with respect to each other in a motorised
way. The crank (17) is formed by two interchangeable levers (17a, 17b) bent with respect
to each other. The machine is improved both effectiveness of the cut and under possibility
of adjustment of the orbit of the saw after sharpening. |