A circular knitting machine for knitted items, comprising: a supporting structure; a needle-holding cylinder selectively turnable and provided with a plurality of cylinder needles; and a dial assembly. The dial assembly includes a supporting ring integral with the supporting structure; a needle-holding plate turnably mounted to the supporting ring; a plurality of plate needles; a plurality of control cams which interact with the plate needles to transmit to them a radial movement inside the respective sliding seat, wherein the control cams globally form a cam profile. The dial assembly includes a stitch cam placed movably on the supporting ring and interacting with the plate needles in a given angular sector during the rotation of the needle-holding plate, so as to transmit to the plate needles a motion of return for executing stitch formation. The stitch cam is selectively movable with respect to the cam profile.

A circular knitting machine includes sinkers and selector jacks corresponding thereto that are provided as separate components. The selector jacks are arranged radially outside the sinkers, and are provided with selector butts such that the selector butts of circumferentially adjacent selector jacks are arranged at different radial positions. An actuator that acts on the selector butts is arranged radially outside the cylinder. The circular knitting machine prevents a failure of sinker selection, while increasing a rotation speed of a cylinder holding knitting needles.

A circular knitting machine includes sinkers and selector jacks corresponding thereto that are provided as separate components. The selector jacks are arranged radially outside the sinkers, and are provided with selector butts such that the selector butts of circumferentially adjacent selector jacks are arranged at different radial positions. An actuator that acts on the selector butts is arranged radially outside the cylinder. The circular knitting machine prevents a failure of sinker selection, while increasing a rotation speed of a cylinder holding knitting needles.

A support and control device to be mounted in a circular knitting machine provided with a supporting structure, a rotating component-holding unit, and a plurality of stitch formation components, includes a support body provided with a mounting portion having a front side and a rear side. The front side faces the component-holding unit and is provided with at least one cam defining a guiding path which interacts with respective butts of the stitch formation components. The device includes at least one through opening between the front side and the rear side, open on the guiding path, which defines an empty space placing the guiding path of the cam in direct communication with an outside of the device, so that the respective butts of the stitch formation components are facing, and in direct communication with, the empty space.