Konica Corporation

Ikuya Hotta

Kazuo Sato

Junji Sato

Masaru Ushio

Satoshi Sakata

Tetsuo Kimoto

Mitsuo Azumai

Tomoya Yoshida

Kei Yamada

Yoshinao Kitahara

Kazuo Izumi

Kunio Shijyo

Yuichi Gotoh

An image forming system, comprises an image forming apparatus including a first memory section to store a program to conduct a predetermined operation, and an image forming apparatus connecting section to connect the image forming apparatus with a network; and an administrating apparatus including an administrating memory section to store a rewrite program for the image forming apparatus, and an administrating apparatus connecting section to connect the administrating apparatus with the network. The image forming apparatus accesses the administrating apparatus through the network, obtains the rewrite program stored in the administrating memory section, and rewrites the program stored in the first memory section with the obtained rewrite program.

Administrating system of image forming apparatus and image forming apparatus

An apparatus for forming an image on a recording sheet comprises a jam data holder storing a predetermined number of jam occurrence data arranged in time sequence, whereby when the jam data holder receives the newest jam occurrence data, the jam data holder adds the newest jam occurrence data into the predetermined number of jam occurrence data and eliminates the oldest jam occurrence data from the predetermined number of jam occurrence data; a calculator for calculating jam occurrence frequency when the jam data holder receives the newest jam occurrence data, wherein the calculator references the jam occurrence data from the predetermined number of jam occurrence data stored in the jam data holder, calculates a number N of jam occurrences, the total sheet number T1 when the oldest jam occurrence was detected and the total sheet number T2 when the newest jam occurrence was detected and calculates a jam occurrence frequency based on the difference between the total sheet number T2 and the total sheet number T1 and the number N of jam occurrence; and a signal generator to output a jam frequently-occurring signal when the number of jam occurrence is larger than a first predetermined number and the jam occurrence frequency is larger than a second predetermined number.

Image forming apparatus

A motor speed control device for use in an image forming apparatus with a differential phase detection circuit for outputting differential phase data between the clock pulse and a frequency proportional signal representative of the motor speed and a differential speed detecting circuit for outputting differential speed data between the length of the clock signal and the length of the speed signal. A pulse width modulated signal obtained from the two signals controls the speed of the motor.

Motor speed control device for use in an image forming apparatus

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Tokyo, Japan

Ikuya Hotta