Konica Minolta Business Technologies, Inc.

Norihiko Nakano

Yuta Tachibana

Tomonobu Tamura

Hiroyuki Watanabe

Katsunori Takahashi

Toru Kasamatsu

A control device for generating a second trigger with a delay of a predetermined time from generation of a first trigger, the control device having: a counter for counting numbers from 0 to n&#x2212;1 at a frequency with cycles of a first period; a control section, which operates at a frequency with cycles of a second period that is longer than the first period, for calculating a remainder of a division by adding a number of counts of the counter corresponding to the predetermined time to a count value of the counter at the time of generation of the first trigger and by dividing a result of the addition by n; and an output section for outputting the second trigger at a time when the count value of the counter becomes equal to the remainder.

Control apparatus and image forming apparatus

An image forming apparatus includes: a stepping motor arranged in a conveying path for a paper; a driver for driving the stepping motor; a current detecting unit for detecting an actual current value; and a control unit for providing a set current value for every predetermined cycle. The control unit determines an estimated load torque value corresponding to the set current value in a previous cycle and the actual current value in a present cycle, by referring to a relationship between actual current and load torque of the stepping motor with respect to the set current value, determines a target load torque value based on the estimated load torque value, and determines, as the set current value, a current value corresponding to the target load torque value, by referring to a relationship between maximum output torque of the stepping motor and current supplied to the stepping motor.

Image forming apparatus having stepping motor arranged in conveying path for paper, and method for controlling stepping motor in image forming apparatus

A variable frequency clock output circuit, comprising: a target value register which stores a target value corresponding to an arbitrarily set target frequency; an increase/decrease value register which stores an arbitrarily set increase/decrease value; an adder-subtractor which has an input portion into which a current output value is inputted and outputs a calculation result obtained by adding/subtracting the increase/decrease value stored in the increase/decrease value register to/from the current output value inputted into the input portion based on an addition/subtraction instruction signal; a comparator which compares an output value of the adder-subtractor to the target value stored in the target value register, and outputs an addition/subtraction instruction signal to the adder-subtractor until the output value of the adder-subtractor and the target value coincide; and a clock generator which outputs a clock signal having a frequency proportional to the output value of the adder-subtractor.

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Hoi-gun, Japan

Norihiko Nakano