A sewing machine for sewing a stitch into an article, the sewing machine comprising: first and second heads, which are each movable relative to the article, the first head comprising: a coupler rotatable about an axis extending in a third direction and through the first and second heads and the article; a first actuator element to rotate with the coupler and to translate relative to the coupler in first and second directions transverse to the axis; a second actuator element to rotate with the coupler, to translate in the first and second directions with the first actuator element and to rotate relative to the first actuator element about an axis along the third direction; and a third actuator element to rotate with the coupler, to translate in the first and second directions with the first actuator element, to rotate with the second actuator element about the axis along the third direction and to translate relative to the second actuator element in the third direction; and the second head comprising: another coupler rotatable about the axis extending in the third direction; another first actuator element to rotate with the another coupler and to translate relative to the another coupler in the first and second directions; and another second actuator element to rotate with the another coupler, to translate in the first and second directions with the another first actuator element, and to translate relative to the another first actuator element in the third direction, wherein the first head comprises first and second stitching elements. first and second heads, which are each movable relative to the article, the first head comprising: a coupler rotatable about an axis extending in a third direction and through the first and second heads and the article; a first actuator element to rotate with the coupler and to translate relative to the coupler in first and second directions transverse to the axis; a second actuator element to rotate with the coupler, to translate in the first and second directions with the first actuator element and to rotate relative to the first actuator element about an axis along the third direction; and a third actuator element to rotate with the coupler, to translate in the first and second directions with the first actuator element, to rotate with the second actuator element about the axis along the third direction and to translate relative to the second actuator element in the third direction; and the second head comprising: another coupler rotatable about the axis extending in the third direction; another first actuator element to rotate with the another coupler and to translate relative to the another coupler in the first and second directions; and another second actuator element to rotate with the another coupler, to translate in the first and second directions with the another first actuator element, and to translate relative to the another first actuator element in the third direction, wherein the first head comprises first and second stitching elements. a coupler rotatable about an axis extending in a third direction and through the first and second heads and the article; a first actuator element to rotate with the coupler and to translate relative to the coupler in first and second directions transverse to the axis; a second actuator element to rotate with the coupler, to translate in the first and second directions with the first actuator element and to rotate relative to the first actuator element about an axis along the third direction; and a third actuator element to rotate with the coupler, to translate in the first and second directions with the first actuator element, to rotate with the second actuator element about the axis along the third direction and to translate relative to the second actuator element in the third direction; and the second head comprising: another coupler rotatable about the axis extending in the third direction; another first actuator element to rotate with the another coupler and to translate relative to the another coupler in the first and second directions; and another second actuator element to rotate with the another coupler, to translate in the first and second directions with the another first actuator element, and to translate relative to the another first actuator element in the third direction, wherein the first head comprises first and second stitching elements. another coupler rotatable about the axis extending in the third direction; another first actuator element to rotate with the another coupler and to translate relative to the another coupler in the first and second directions; and another second actuator element to rotate with the another coupler, to translate in the first and second directions with the another first actuator element, and to translate relative to the another first actuator element in the third direction, wherein the first head comprises first and second stitching elements.