Variable hair length apparatus for hair rooting

A hair rooting apparatus comprising:

• a needle configured to root hair thread into a head;
• a cutter configured to cut the rooted hair thread to produce hair strands;
• a hair feeding device configured to position the hair thread at the needle and the cutter;
• a variable hair length module configured to adjust a length of the hair strands rooted into the head, the variable hair length module comprising two arms configured to move relative to each other;
• and
• a control system configured to input programs of instruction to the variable hair length module to automatically control relative movement of the two arms;
• wherein the hair thread is configured to engage with each of the two arms such that the length of each hair strand is varied by the relative movement of the two arms.

A hair rooting apparatus comprising:

• a hair feeding device configured to guide a hair thread relative to a head;
• a needle including a hook, the needle configured to pierce the head and the hook configured to, at certain times during rooting, grab the hair thread from the hair feeding device;
• a trimming mechanism including a cutter configured to cut the hair thread to form a hair strand having a cut region at the cutter and a root region penetrating the head;
• a variable length module configured to adjust a length between the cut region and the root region between hair strands;
• and
• a control system in communication with the variable length module, the hair feeding device, and the needle, the control system configured to adjust one or more aspects of motion of the needle and one or more aspects of motion of the hair feeding device based on a state of the variable length module.