Safety system in electrostatic copier

Claim 2

An electrostatic copier including an exposure illuminating discharge tube, a cabinet including an access door, a capacitor for energizing said tube housed in said cabinet, means for effecting a preselected number of exposures and characterized in the provision of a safety system comprising means for charging said capacitor, means responsive to the last exposure of said predetermined number for deactuating said charging means, and means responsive to the opening of said door for discharging said capacitor.

Claim 3

The electrostatic copier of claim 1 wherein said capacitor discharging means comprises a switch, means including a resistor connecting said switch across said capacitor, and means responsive to the opening of said door for closing said switch.

Claim 4

An electrostatic copier comprising an exposure illuminating discharge tube, a capacitor for energizing said tube, a selectively preset exposure counter including a first switch closed in response to the 1 condition of said counter, a copy operation starting second switch and characterized in the provision of means for charging said capacitor, a third switch transferable between closed and open conditions for actuating and deactuating said charging means, a fourth switch closed in response to the voltage across said capacitor exceeding a predetermined value and means responsive to the actuation of said second switch for closing said third switch and responsive to the closing of said first switch and the closing of said fourth switch for opening said third switch.

Claim 5

An electrostatic copier comprising an exposure illuminating discharge tube, a capacitor for energizing said tube, a selectively preset exposure counter including a first switch closed in response to the 1 condition of said counter, a copy operation starting second switch and characterized in the provision of means for charging said capacitor, a third switch transferable between closed and open conditions for actuating and deactuating said charging means, a fourth switch closed in response to the voltage across said capacitor exceeding a predetermined value and means responsive to the actuation of said second switch for closing said third switch and responsive to the closing of said first switch and the closing of said fourth switch for opening said third switch.

Claim 6

The electrostatic copier of claim 3 including a fifth switch, a sixth switch and means responsive to the actuation of said fifth switch for triggering the flashing of said tube, said fifth switch being actuated in response to the closing of said sixth switch and said counter being actuated in response to the closing of said sixth switch.

Claim 7

An electrostatic copier comprising an exposure illuminating discharge tube, a capacitor for energizing said tube, a selectively preset exposure counter including a first switch closed in response to the 1 condition of said counter, a copy operation starting second switch and characterized in the provision of means for charging said capacitor, a third switch transferable between closed and open conditions for actuating and deactuating said charging means, a fifth switch actuated to a closed position in response to the flashing of said discharge tube and means responsive to the actuation of said second switch for closing said third switch and responsive to the closing of said first switch and the closing of fifth switch for opening said third switch.

Claim 8

An electrostatic copier comprising an exposure illuminating discharge tube, a capacitor for energizing said tube, a selectively preset exposure counter including a first switch closed in response to the 1 condition of said counter, a copy operation starting second switch and characterized in the provision of means for charging said capacitor, a third switch transferable between closed and open conditions for actuating and deactuating said charging means, a fifth switch actuated to a closed position in response to the flashing of said discharge tube and means responsive to the actuation of said second switch for closing said third switch and responsive to the closing of said first switch and the closing of fifth switch for opening said third switch.

Claim 9

An electrostatic copier including a cabinet having an access door movable between an open and closed position, a high voltage capacitor housed in said cabinet, a first switch transferable between a first and second state in response to closing and opening respectively of said door, a second switch transferable to a closed and open condition in response to said first and second states of said first switch respectively, and means connecting said second switch across said capacitor.

Claim 10

An electrostatic copier including a cabinet having an access door movable between an open and closed position, a high voltage capacitor housed in said cabinet, a first switch transferable between a first and second state in response to closing and opening respectively of said door, a second switch transferable to a closed and open condition in response to said first and second states of said first switch respectively, and means connecting said second switch across said capacitor.

Claim 11

The electrostatic copier of claim 6 wherein said means connecting said second switch across said capacitor includes a shunting resistor.

Claim 12

The electrostatic copier of claim 6 including a plurality of access doors and a plurality of said first switches each of said first switches being closed and opened in response to the opening and closing respectively of a corresponding door, said second switch being closed in response to the closing of any of said first switches.

Claim 13

The electrostatic copier of claim 8 including a plurality of third switches, connected in series, each of said third switches being open and closed with the closing and opening respectively of a corresponding door, and means for connecting said copier to an energizing current source through said series connected third switches.

Claim 14

The electrostatic copier of claim 9 comprising means for actuating said second switch to its closed position, an electrical power source for energizing said switch actuating means, and means connecting said first switches in parallel and connecting said actuating means through said first switches to said power source.

Claim 15

The electrostatic copier of claim 9 wherein each pair of said first and third switches comprises first and second pairs of contacts and a switch arm actuated by a respective door alternatively bridging said first or second contact pairs.