Casio MD-910, Technical Manual

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(3) Head drive mechanism
The head assembly is connected to the cylinder cam assembly via a shaft pin. The shaft pin is
inserted in a scribed groove on the outside of the cylinder cam assembly and moves along the
groove when the cylinder cam assembly is turned to drive the head assembly.
When the head assembly travels be-
yond the home position, the shaft pin
goes through a sharp curve in the
scribed groove, so it moves slowly.
At this time, printing is performed.
When the head assembly travels be-
yond the printable area, the direction
of movement is changed to the home
position because the direction of
groove is reversed and the head re-
turn spring tension is activated.
At this time, the head assembly trav-
els at high-speed because the groove
is turned to the slow curve.
Register paper feeding is performed
when the head assembly returns.
When the head assembly travels to
the home position, it returns to the
original groove position, and the op-
eration is repeated.