Driver for a twin cutting device with counter-rotating blades

A driver for a twin cutting device, which comprises a first blade, which is non-rotatably arranged on a drive shaft to be rotated about an axis of rotation in a first direction, a second blade, which is non-rotatably arranged on a drive socket, which encloses the drive shaft, to be rotated about the same axis of rotation in a second direction opposite to said first direction, the two blades extending parallel to and close to each other, and a drive motor which is arranged to drive both the drive shaft and the drive socket, wherein the drive shaft constitutes a driving central shaft in a gear, and that said gear comprises a sun wheel, which is non-rotatably arranged on the drive shaft to be rotated by the same, at least a first planet wheel, which meshes with the sun wheel and is rotatable about an axis parallel to the axis of rotation, at least a second planet wheel, which is arranged to rotate simultaneously with the first planet wheel about the same axis, and a gear rim, which with internal teeth meshes with the second planet wheel and is non-rotatably mounted on the drive socket to rotate the same,

• wherein the drive socket is formed as an annular disc, the drive shaft extends through the centre of the annular disc, and an outer diameter of the annular disc corresponds to an outer diameter of the gear rim, and
• wherein the drive socket has a central recess, in which a roller bearing arranged on the drive shaft is mounted.

A driver for a twin cutting device, which comprises a first blade, which is non-rotatably arranged on a drive shaft to be rotated about an axis of rotation in a first direction, a second blade, which is non-rotatably arranged on a drive socket, which encloses the drive shaft, to be rotated about the same axis of rotation in a second direction opposite to said first direction, the two blades extending parallel to and close to each other, and a drive motor which is arranged to drive both the drive shaft and the drive socket, wherein the drive shaft constitutes a driving central shaft in a gear, and that said gear comprises a sun wheel, which is non-rotatably arranged on the drive shaft to be rotated by the same, at least a first planet wheel, which meshes with the sun wheel and is rotatable about an axis parallel to the axis of rotation, at least a second planet wheel, which is arranged to rotate simultaneously with the first planet wheel about the same axis, and a gear rim, which with internal teeth meshes with the second planet wheel and is non-rotatably mounted on the drive socket to rotate the same,

• wherein the second planet wheel is closer to the blades than the first planet wheel, and
• wherein the gear comprises a case, which is arranged to be fixedly connected to the motor and has a rear wall, through which the drive shaft extends and which supports a planet wheel shaft for said planet wheels.