A linking machine comprising: - a fixed unit comprising a support frame, - and a mobile unit comprising: - a fabric feed device for advancing or transporting a fabric in a longitudinal (Y-Y) direction, - a device for positioning a needle in a transverse direction (X-X), perpendicular to said longitudinal direction (Y-Y) and coplanar with the fabric, - an actuator device of said needle in a vertical direction (Z-Z), perpendicular to said longitudinal (Y-Y) and transverse (X-X) directions, for performing the linking, wherein the linking machine comprises a feed guide for a folded or standing neck (1,10), provided with a separating cotton, and a knitted fabric to be joined, positioned upstream of said needle in the longitudinal direction (Y-Y), the feed guide comprising - a first stop suitable to constitute an abutment and a positioning for said separating cotton of the neck (1,10), said first stop being adjustable in position along said transversal direction (X-X) so as to be able to adjust a distance (a) of a seam line from the inner edge of the neck (1, 10) and - an adjustable second stop configured to receive in abutment a neckline of the knitted fabric and adjustable to vary the amount (b) of knitted fabric sewn inside the folded neck; the linking machine being characterised by the feed guide further comprising - a first toothed or needle dial for pushing and holding the separating cotton of the neck (1,10) against said adjustable first stop, and - -a second toothed or needle dial for holding and pushing in abutment the lower edge of the folded neck and for holding the knitted fabric against said second adjustable stop. - a fixed unit comprising a support frame, - and a mobile unit comprising: - a fabric feed device for advancing or transporting a fabric in a longitudinal (Y-Y) direction, - a device for positioning a needle in a transverse direction (X-X), perpendicular to said longitudinal direction (Y-Y) and coplanar with the fabric, - an actuator device of said needle in a vertical direction (Z-Z), perpendicular to said longitudinal (Y-Y) and transverse (X-X) directions, for performing the linking, wherein the linking machine comprises a feed guide for a folded or standing neck (1,10), provided with a separating cotton, and a knitted fabric to be joined, positioned upstream of said needle in the longitudinal direction (Y-Y), the feed guide comprising - a first stop suitable to constitute an abutment and a positioning for said separating cotton of the neck (1,10), said first stop being adjustable in position along said transversal direction (X-X) so as to be able to adjust a distance (a) of a seam line from the inner edge of the neck (1, 10) and - an adjustable second stop configured to receive in abutment a neckline of the knitted fabric and adjustable to vary the amount (b) of knitted fabric sewn inside the folded neck; the linking machine being characterised by the feed guide further comprising - a first toothed or needle dial for pushing and holding the separating cotton of the neck (1,10) against said adjustable first stop, and - -a second toothed or needle dial for holding and pushing in abutment the lower edge of the folded neck and for holding the knitted fabric against said second adjustable stop.