Winding device for fabric winding rollers of knitwear machines, said device comprising: - motor means; - coupling means rotatably connected to the motor means and designed to be coupled with a shaft of a roller rotatable around its own axis (X'), to transmit to said roller the rotation motion of the motor means; - blocking means designed to axially block the device on the shaft of the roller; - aligning means designed to align a rotation axis of the coupling means with the axis (X') of the shaft of the roller, making the two axes (X and X') coincide to compensate for misalignments between the coupling means and the shaft of the roller; characterized in that it comprises a control element connected to the blocking means and designed to drive the blocking means to lock/unlock the device on the shaft and connect/disconnect it from the roller, without needing to manually operate on the blocking means, and in that the blocking means comprise a sliding ring equipped with balls designed to be engaged in a groove of the shaft, and in that the control element comprises at least one handle connected to the ring to allow an operator to move the ring by means of the handle locking/unlocking the shaft from the balls, thereby connecting or disconnecting the device from the roller without having to manually operate on the ring; and wherein the coupling means comprise a rigid coupling having a grooved profile designed to be coupled with a grooved profile of the shaft of the roller, and further comprise a right and left rotation selector of the motor means to slowly rotate the motor and align the grooves of both of the grooved profile of the rigid coupling and the grooved profile of the shaft - motor means; - coupling means rotatably connected to the motor means and designed to be coupled with a shaft of a roller rotatable around its own axis (X'), to transmit to said roller the rotation motion of the motor means; - blocking means designed to axially block the device on the shaft of the roller; - aligning means designed to align a rotation axis of the coupling means with the axis (X') of the shaft of the roller, making the two axes (X and X') coincide to compensate for misalignments between the coupling means and the shaft of the roller; characterized in that it comprises a control element connected to the blocking means and designed to drive the blocking means to lock/unlock the device on the shaft and connect/disconnect it from the roller, without needing to manually operate on the blocking means, and in that the blocking means comprise a sliding ring equipped with balls designed to be engaged in a groove of the shaft, and in that the control element comprises at least one handle connected to the ring to allow an operator to move the ring by means of the handle locking/unlocking the shaft from the balls, thereby connecting or disconnecting the device from the roller without having to manually operate on the ring; and wherein the coupling means comprise a rigid coupling having a grooved profile designed to be coupled with a grooved profile of the shaft of the roller, and further comprise a right and left rotation selector of the motor means to slowly rotate the motor and align the grooves of both of the grooved profile of the rigid coupling and the grooved profile of the shaft characterized in that it comprises a control element connected to the blocking means and designed to drive the blocking means to lock/unlock the device on the shaft and connect/disconnect it from the roller, without needing to manually operate on the blocking means, and in that the blocking means comprise a sliding ring equipped with balls designed to be engaged in a groove of the shaft, and in that the control element comprises at least one handle connected to the ring to allow an operator to move the ring by means of the handle locking/unlocking the shaft from the balls, thereby connecting or disconnecting the device from the roller without having to manually operate on the ring; and wherein the coupling means comprise a rigid coupling having a grooved profile designed to be coupled with a grooved profile of the shaft of the roller, and further comprise a right and left rotation selector of the motor means to slowly rotate the motor and align the grooves of both of the grooved profile of the rigid coupling and the grooved profile of the shaft