Printing apparatus having multiple control units to control driving of printhead

摘要

An encoder sensor is mounted on a printhead and optically reads an encoder film. And a number of pulses of a pulse signal proportional to a moving amount of a printhead is counted and stored as a count value in a memory within multiple ICs. The count value stored in the memories is reset while the pulse signal outputted from the encoder sensor is blocked by a gate or while a region other than near a boundary between a penetration region and a non-penetration region of the encoder film is being read.

主权项

1. A printing apparatus, comprising:
a generation unit configured to generate a first pulse signal and a second pulse signal with a phase shifted relative to the first pulse signal, wherein the first pulse signal and the second pulse signal are associated with movement of a printhead in which printing elements are grouped into a plurality of groups, and the first pulse signal and the second pulse signal indicate a position in a scanning direction of the printhead; multiple control units configured to control driving of the printhead, wherein each of the multiple control units includes a count unit that counts position information of the printhead based on the first pulse signal and the second pulse signal generated by the generation unit, and corresponds to one of the plurality of groups; and a supply unit configured to receive the first pulse signal and the second pulse signal generated by the generation unit and configured to control supplying the first pulse signal and the second pulse signal to the multiple control units, wherein the supply unit comprises a stopping unit configured to stop supply of the first pulse signal and the second pulse signal to be supplied to the multiple control units in a case where a count value counted by the count unit is set to a reference value indicating a reference position in the scanning direction of the printhead.