Electrostatic copying machine

Claim 2

A copy machine comprising an optical system for viewing a sheet to be copied and projecting an image thereof onto a photosensitive surface, said optical system including a mirror mounted for essentially pivotal movement about an axis in a relation scanning said sheet to be copied, and means for shifting said mirror essentially transversely of said axis in timed relation to the pivotal movement thereof.

Claim 3

A copy machine as recited in claim 1, including an electrostatically chargeable unit having said photosensitive surface formed thereon, there being an elongated slit at one location about the periphery of the drum through which said optical system directs an image of said sheet.

Claim 4

A copy machine as recited in claim 1, in which said optical system includes a projection lens interposed optically between said mirror and said photosensitve surface.

Claim 5

A copy machine as recited in claim 1, including means for receiving said sheet to be copies in a substantially flattened condition for viewing by said optical system, said shifting means being operable to move the mirror transversely of said axis in a direction and to an extent compensating for the nonarcuate disposition of said flattened sheet about said pivotal axis of the mirror.

Claim 6

A copy machine as recited in claim 1, including an electrostatically chargeable rotary drum having said photosensitive surface formed thereon, there being an elongated slit through which said optical system directs a partial scanning image of said sheet to be copied onto a localized portion of said drum as it turns, and a drive connection between said drum and said mirror for turning the drum about its axis in correspondence with rotary movement of the drum, said shifting means including a cam structure which pivots with the mirror and shifts it transversely of the pivotal axis of the mirror as the latter pivots.

Claim 7

A copy machine as recited in claim 1, in which said optical system includes a lens, an electrostatically chargeable rotary drum having said photosensitve surface formed thereon, there being an elongated slit through saich lens directs a partial scanning image along a predetermined optical axis onto said drum, said shifting means being operable to shift said mirror along said optical axis in accordance with the formula:y K -( d( 1 -sin t)/(sin 2 theta cos t - sin t cos 2 theta - sin t)) where: d is the shortest path distance from the mirror to the sheet being copied; y is the distance from said lens to said mirror along the optical axis; K is the optical object distance; t is the angle between the optical axis of the lens and the plane of the sheet being copied; theta is the angle of the optical axis to a line normal to the mirror.

Claim 8

A copy machine comprising an optical system, having an optic axis, for viewing a sheet to be copied and projection an image thereof onto a photosensitive surface; said optical system including a mirror mounted for essentially pivotal movement about a pivotal axis in a relation scanning said sheet to be copied, means for pivoting said mirror at a nonuniform rate at Least partially compensating for a nonarcuate relationship of said sheet with respect to the pivotal axis of the mirror; and means for shifting said mirror transversely of its pivotal axis in timed relation to the pivotal movement of the mirror.

Claim 9

A copy machine comprising an optical system, having an optic axis, for viewing a sheet to be copied and projection an image thereof onto a photosensitive surface; said optical system including a mirror mounted for essentially pivotal movement about a pivotal axis in a relation scanning said sheet to be copied, means for pivoting said mirror at a nonuniform rate at Least partially compensating for a nonarcuate relationship of said sheet with respect to the pivotal axis of the mirror; and means for shifting said mirror transversely of its pivotal axis in timed relation to the pivotal movement of the mirror.

Claim 10

A copy machine comprising a unit having a photosensitve surface and moving at a predetermined rate; an optical system, having an optic axis, for viewing a sheet to be copied and projecting an image thereof onto said photo-sensitive surface; said optical system including a mirror mounted for essentially pivotal movement about a pivotal axis in a relation scanning said sheet to be copied; and means for pivoting said mirror at a nonuniform rate at least partially compensating for a nonarcuate relationship of said sheet with respect to the pivotal axis of the mirror; said last mentioned means pivoting said mirror at a rate: d theta /dS -((sin 2 theta cos t - sin t cos 2 theta -sin t)2/2d (1 - sin t)) where: theta is the angle of inclination between the normal to the mirror and the optic axis to said unit; t is the angle between said optic axis and the plane of said sheet; d theta /dS is the rate of pivotal movement of the mirror plane with respect to linear movement of said unit for 1:1 optical conjugates.

Claim 11

A copy machine comprising a unit having a photosensitve surface and moving at a predetermined rate; an optical system, having an optic axis, for viewing a sheet to be copied and projecting an image thereof onto said photo-sensitive surface; said optical system including a mirror mounted for essentially pivotal movement about a pivotal axis in a relation scanning said sheet to be copied; and means for pivoting said mirror at a nonuniform rate at least partially compensating for a nonarcuate relationship of said sheet with respect to the pivotal axis of the mirror; said last mentioned means pivoting said mirror at a rate: d theta /dS -((sin 2 theta cos t - sin t cos 2 theta -sin t)2/2d (1 - sin t)) where: theta is the angle of inclination between the normal to the mirror and the optic axis to said unit; t is the angle between said optic axis and the plane of said sheet; d theta /dS is the rate of pivotal movement of the mirror plane with respect to linear movement of said unit for 1:1 optical conjugates.

Claim 12

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series ofsuccessive of successive of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, and means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said first unit being a rotary electrostatically chargeable drum, said first mentioned means including an optical projection system for viewing said sheet to be copied and projecting a partial image thereof onto a localized portion of said drum, and means forming an elongated slit through which said partial image passes to the drun, said optical projection system including a mirror which reflects light from said sheet to be copied and pivots about an axis in timed relation to the rotation of said drum to scan the sheet to be copied and produce a scanning image thereof through said slit, and means for shifting said mirror essentially transversely of said axis in timed relation to the pivotal movement thereof.

Claim 13

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series ofsuccessive of successive of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, and means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said first unit being a rotary electrostatically chargeable drum, said first mentioned means including an optical projection system for viewing said sheet to be copied and projecting a partial image thereof onto a localized portion of said drum, and means forming an elongated slit through which said partial image passes to the drun, said optical projection system including a mirror which reflects light from said sheet to be copied and pivots about an axis in timed relation to the rotation of said drum to scan the sheet to be copied and produce a scanning image thereof through said slit, and means for shifting said mirror essentially transversely of said axis in timed relation to the pivotal movement thereof.

Claim 14

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said second unit being an electrostatically chargeable drum which at one location about its periphery is in close proximity to said first unit, and means for illuminating said drum at said location of close proximity to said first unit and thereby rendering it electrically conductive to assume a charge pattern corresponding to the charge pattern on said first unit.

Claim 15

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said second unit being an electrostatically chargeable drum which at one location about its periphery is in close proximity to said first unit, and means for illuminating said drum at said location of close proximity to said first unit and thereby rendering it electrically conductive to assume a charge pattern corresponding to the charge pattern on said first unit.

Claim 16

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said second unit being a rotary drum having an electrostatically chargeable layer whose outer surface is movable into close proximity with said first unit at a predetermined location, and means at the radially inner side of said electrostatically chargeable layer for illuminating said layer at said location of close proximity to said first unit.

Claim 17

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said second unit being a rotary drum having an electrostatically chargeable layer whose outer surface is movable into close proximity with said first unit at a predetermined location, and means at the radially inner side of said electrostatically chargeable layer for illuminating said layer at said location of close proximity to said first unit.

Claim 18

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a seris of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said second unit being a rotary drum having an electrostatically chargeable layer whose outer surface is movable into close proximity with said first unit at a predetermined location, means at the radially inner side of said electrostatically chargeable layer for illuminating said layer at said location of close proximity to said first unit, and a nonrotating light shield within said drum containing a slit through which light from said last mentioned means passes to said electrostatically chargeable layer.

Claim 19

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a seris of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said second unit being a rotary drum having an electrostatically chargeable layer whose outer surface is movable into close proximity with said first unit at a predetermined location, means at the radially inner side of said electrostatically chargeable layer for illuminating said layer at said location of close proximity to said first unit, and a nonrotating light shield within said drum containing a slit through which light from said last mentioned means passes to said electrostatically chargeable layer.

Claim 20

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said second unit being a rotary drum having an electrostatically chargeable layer whose outer surface is movable into close proximity with said first unit at a predetermined location, and means at the radially inner side of said electrostatically chargeable layer for illuminating said layer at said location of close proximity to said first unit, said drum having a transparent layer radially inwardly of said electrostatically chargeable layer and passing light radially outwardly thereto.

Claim 21

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remains the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic pattern on said second unit, said second unit being a rotary drum having an electrostatically chargeable layer whose outer surface is movable into close proximity with said first unit at a predetermined location, and means at the radially inner side of said electrostatically chargeable layer for illuminating said layer at said location of close proximity to said first unit, said drum having a transparent layer radially inwardly of said electrostatically chargeable layer and passing light radially outwardly thereto.

Claim 22

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remaino the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic patteRn on said second unit, said first unit being an electrostatically chargeable first drum, said first mentioned means including an optical projection system for scanning said sheet to be copies and projecting a moving image thereof onto said first drum through an elongated slit, said second unit being a second drum mounted to turn in timed relation to the first drum and having an electrostatically chargeable layer receivable in close proximity to the first drum at a predetermined location about the periphery of the second drum, means for charging said electrostatic layer of the second drum in advance of its arrival at said location of close proximity, and means for illuminating said layer at said location of close proximity to give said layer a charge pattern corresponding to that of said first drum.

Claim 23

A copy machine comprising a first electrostatically chargeable unit, means for applying to said unit an electrostatic charge in a pattern corresponding to the markings on a sheet to be copied, a second electrostatically chargeable unit receivable in close proximity to said first unit and adapted on a series of successive cycles of operation to be charged repeatedly by said first unit in a pattern corresponding to a single charge pattern on said first unit which remaino the same for said series of cycles, means operable on said series of cycles to print electrostatically onto a series of copy sheets a repeating printed pattern corresponding to the repeating electrostatic patteRn on said second unit, said first unit being an electrostatically chargeable first drum, said first mentioned means including an optical projection system for scanning said sheet to be copies and projecting a moving image thereof onto said first drum through an elongated slit, said second unit being a second drum mounted to turn in timed relation to the first drum and having an electrostatically chargeable layer receivable in close proximity to the first drum at a predetermined location about the periphery of the second drum, means for charging said electrostatic layer of the second drum in advance of its arrival at said location of close proximity, and means for illuminating said layer at said location of close proximity to give said layer a charge pattern corresponding to that of said first drum.

Claim 24

A copy machine as recited in claim 14, in which said electrostatically chargeable layer of the second drum is opaque, said second drum having a transparent layer radially inwardly of said electrostatically chargeable layer and through which said illuminating means direct light radially outwardly against the electrostatically chargeable layer at said location of close proximity.

Claim 25

A copy machine as recited in claim 15, in which said printing means include means for applying a toner to said second drum beyond said location of close proximity, means for electrostatically moving said toner from said second drum onto said copy sheets, and means for fusing the toner on said copy sheets