Established in Shibuya, Tokyo in 1963, SUMTAK branched out into digital counter and cam switches opening a Tokyo office as a sales department due to the increased order of sensors and high frequency encoders.
In 1975 manufacturing of optical rotary encoders focused on NC machine tool industry begins and in 1979 the Sagamihara Plant opens for volume production of optical rotary encoder.
In 1986 Sumtak became a top manufacturer of optical rotary encoder in Japan.
1990 saw volume production of sensor for Shinkanasen start and in 1994 a new control System Department is established to develop servo control systems.
In April 2000 Sumtak becomes a 100% subsidiary of HEIDENHAIN, Germany and in 2004 Sumtak acquired the PULSCALE business from Futaba Corporation. In 2006 the Machida Plant is launched including new headquarters headquarters and a Tokyo sales office.
2009 saw a full merger with HEIDENHAIN K.K.