Electric apparatus having a start-up control function

Claim 2

In a recording apparatus having a plurality of electrical devices that enable a recording operation and which require start-up electric currents exceeding an amount of current required at ordinary operational states of those devices, said devices including a motor for providing a rotational movement, the improvement comprising: a power source; power supply means provided for each of the devices for supplying electric power from said power source to the respective device; stable detecting means provided for the motor for detecting rotation of the motor and for generating a stable state signal when it is detected that the rotation of the motor becomes stable after a start-up thereof, and control means for controlling said power supply means to provide electric power to a subsequent device in response to the output of the stable state signal generated from the state detecting means of the previously started motor.

Claim 3

The invention set forth in claim 1, wherein said motor is a main motor of the apparatus and said subsequent device is a polygon mirror motor for rotating a polygon mirror, with said main motor being started earlier than said polygon mirror motor.

Claim 4

The invention set forth in claim 1, wherein said motor is a main motor of the apparatus and said subsequent device is a heater for fixing a toner image, with said main motor being started earlier than said heater.

Claim 5

The invention set forth in claim 1, wherein said stable detecting means includes an encoder connected to said motor.

Claim 10

In a laser printer having a plurality of electrical devices that enable the laser printer operation and which require start-up electric currents exceeding an amount of current required at ordinary operational states of those devices, the improvement comprising: a power source; power supplying means provided for each of the devices for supplying electric power from said power source to the respective devices, one of said devices is a motor for driving a movable member and another of said devices is a heater for fixing a toner image, with said heater being started by electric power earlier than said motor; stable detecting means provided, for each of the devices, for detecting the status of each of the devices and for generating a stable state signal when it is detected that the corresponding device enters a stable state after a start-up thereof, the stable state detecting means for the motor detects the rotational speed of the motor and generates a lock signal indicating a constant rotational speed; measuring means disposed between said power source and said power supply means for measuring a total current amount supplied to the respective devices and for generating a stable state signal when the total current amount is reduced to lower than a predetermined value after one or a plurality of devices has been started up, and control means for controlling said power supply means to provide electric power to a subsequent device in response to the output of the stable state signal generated from the measuring means.

Claim 11

In a laser printer having a plurality of electrical devices that enable the laser printer operation and which require start-up electric currents exceeding an amount of current required at ordinary operational states of those devices, the improvement comprising: a power source; power supplying means provided for each of the devices for supplying electric power from said power source to the respective devices, one of said devices is a motor for driving a movable member and another of said devices is a heater for fixing a toner image, with said heater being started by electric power earlier than said motor; stable detecting means provided, for each of the devices, for detecting the status of each of the devices and for generating a stable state signal when it is detected that the corresponding device enters a stable state after a start-up thereof, the stable state detecting means for the motor detects the rotational speed of the motor and generates a lock signal indicating a constant rotational speed; measuring means disposed between said power source and said power supply means for measuring a total current amount supplied to the respective devices and for generating a stable state signal when the total current amount is reduced to lower than a predetermined value after one or a plurality of devices has been started up, and control means for controlling said power supply means to provide electric power to a subsequent device in response to the output of the stable state signal generated from the measuring means.

Claim 12

In a recording apparatus having a plurality of electrical devices that enable a recording operation and which require start-up electric currents exceeding an amount of current required at ordinary operational states of those devices, the improvement comprising: a power source; power supply means provided for each of the devices for supplying electric power from said power source to the respective device, one of said devices is a motor driving a movable member; stable detecting means provided for each of the devices for detecting the status of each of the devices and for generating a stable state signal when it is detected that the corresponding device enters a stable state after a start-up thereof, the stable state detecting means for the motor detects a rotational speed of the motor and generates a lock signal indicating a constant rotational speed; means for determining the existence of the lock signal and generating a corresponding signal; measuring means disposed between said power source and said power supply means for measuring a total current amount supplied to the respective devices and for generating a stable state signal when the total current amount is reduced to lower than a predetermined value after one or a plurality of devices has been started up, and control means for controlling said power supply means to provide electric power to a subsequent device in response to the output of the signal from the determining means.

Claim 13

In a recording apparatus having a plurality of electrical devices that enable a recording operation and which require start-up electric currents exceeding an amount of current required at ordinary operational states of those devices, the improvement comprising: a power source; power supply means provided for each of the devices for supplying electric power from said power source to the respective device, one of said devices is a motor driving a movable member; stable detecting means provided for each of the devices for detecting the status of each of the devices and for generating a stable state signal when it is detected that the corresponding device enters a stable state after a start-up thereof, the stable state detecting means for the motor detects a rotational speed of the motor and generates a lock signal indicating a constant rotational speed; means for determining the existence of the lock signal and generating a corresponding signal; measuring means disposed between said power source and said power supply means for measuring a total current amount supplied to the respective devices and for generating a stable state signal when the total current amount is reduced to lower than a predetermined value after one or a plurality of devices has been started up, and control means for controlling said power supply means to provide electric power to a subsequent device in response to the output of the signal from the determining means.

Claim 14

The invention set forth in claim 8, wherein said stable state detecting means includes a circuit for measuring electric currents to be supplied to the respective devices.