Device for preventing development of non-image marginal portions of a photoreceptor in electrophotographic copying apparatus

Claim 1

A device for preventing staining of selected marginal portions of a photoreceptor in an electrophotographic copying apparatus including means for charing a photoreceptor moving along a defined path with respect to the charging means, said device comprising a plurality of charge preventing plates and means for selectively positioning said plates at the side margins transversely of said path to prevent charging of selected side marginal portions of the photoreceptor by the charging means and to thereby define the width of the charged area of the photoreceptor, an original rest plate for supporting an original for copying, width indicator means, means for mounting the width indicator means for sliding movement along one edge of the rest plate transverse to said defined path to indicate the desired width of an original placed on the plate, means for supporting the charge preventing plates for sliding transverse movement with respect to the charging means, and means for linking the indicator means with the charge preventing plates for corresponding movement thereof when the width indicator means are manually moved to indicate the desired width of an original.

Claim 2

A device for preventing staining of selected marginal portions of a photoreceptor in an electrophotographic copying apparatus including means for charing a photoreceptor moving along a defined path with respect to the charging means, said device comprising a plurality of charge preventing plates and means for selectively positioning said plates at the side margins transversely of said path to prevent charging of selected side marginal portions of the photoreceptor by the charging means and to thereby define the width of the charged area of the photoreceptor, an original rest plate for supporting an original for copying, width indicator means, means for mounting the width indicator means for sliding movement along one edge of the rest plate transverse to said defined path to indicate the desired width of an original placed on the plate, means for supporting the charge preventing plates for sliding transverse movement with respect to the charging means, and means for linking the indicator means with the charge preventing plates for corresponding movement thereof when the width indicator means are manually moved to indicate the desired width of an original.

Claim 5

A device for preventing staining of selected marginal portions of a photoreceptor in an electrophotographying copying apparatus including means for charging a photoreceptor moving along a defined path with respect to the charging means, said device comprising a plurality of charge preventing plates and means for selectively positioning said plates at the side margins transversely of said path to prevent charging of selected side marginal portions of the photoreceptor by the charging means and to thereby define the width of the charged area of the photoreceptor, said machiNe further including an exposing station having an exposing position along the path of a photoreceptor downwstream from the charging means, and means for projecting an image of an original onto a photoreceptor at an exposing position at said exposing station, said device further comprising means for selectively discharging a marginal portion at least at one of the longitudinal ends of a photoreceptor at the exposing position including a light source and a light intercepting plate blocking the light therefrom and preventing it from reaching a selected central portion of the photoreceptor at the exposing position, a width indicator and a length indicator each slidably mounted along a different one of two intercepting edges of the original rest plate and manually moveable therealong to indicate the desired width and length of an original respectively, and means for linking said indicators with the charge preventing plates and with the light intercepting plate respectively to position the plates for discharging of marginal portions of a photoreceptor surrounding the area of the photoreceptor corresponding to the selected desired size of an original.

Claim 6

A device for preventing staining of selected marginal portions of a photoreceptor in an electrophotographying copying apparatus including means for charging a photoreceptor moving along a defined path with respect to the charging means, said device comprising a plurality of charge preventing plates and means for selectively positioning said plates at the side margins transversely of said path to prevent charging of selected side marginal portions of the photoreceptor by the charging means and to thereby define the width of the charged area of the photoreceptor, said machiNe further including an exposing station having an exposing position along the path of a photoreceptor downwstream from the charging means, and means for projecting an image of an original onto a photoreceptor at an exposing position at said exposing station, said device further comprising means for selectively discharging a marginal portion at least at one of the longitudinal ends of a photoreceptor at the exposing position including a light source and a light intercepting plate blocking the light therefrom and preventing it from reaching a selected central portion of the photoreceptor at the exposing position, a width indicator and a length indicator each slidably mounted along a different one of two intercepting edges of the original rest plate and manually moveable therealong to indicate the desired width and length of an original respectively, and means for linking said indicators with the charge preventing plates and with the light intercepting plate respectively to position the plates for discharging of marginal portions of a photoreceptor surrounding the area of the photoreceptor corresponding to the selected desired size of an original.

Claim 7

A device for preventing staining of selected marginal portions of a photoreceptor in an electrophotographic copying apparatus having means for charging a photoreceptor moving along a defined path with respect to the charging means, an original rest plate for supporting an original placed thereon for copying and exposing means having an exposing station located downstream from the charging means along the path of the photoreceptor for projecting an image of an original placed on the rest plate for copying onto a photoreceptor disposed at an exposing position at said exposing station, said device comprising moveable means disposed adjacent the charging means for selectively preventing the charging of selected side marginal portions of a photoreceptor moving towards the exposing means and means located at least at one of the longitudinal ends of the exposing means for discharging selected marginal portions at least at one of the longitudinal ends of a photoreceptor disposed at the exposing position, a width indicator visible from outside the copying apparatus and mounted for sliding movement along an edge of the rest plate transverse to said defined path and a length indicator visible from outside the copying apparatus and mounted for sliding movement along a longitudinal edge of the rest plate parallel to said defined path, means for linking the width indicator with the charge preventing means for moving the charge preventing means to a position for preventing the charging of selected side marginal portions of the photoreceptor as indicated by the position to which the width indicator has been moved, and means for linking the discharging means at the exposing station with the length indicator for discharging a selected marginal portion of the photoreceptor at its exposing position as indicated by the position to which the length indicator has been moved.

Claim 8

A device for preventing staining of selected marginal portions of a photoreceptor in an electrophotographic copying apparatus having means for charging a photoreceptor moving along a defined path with respect to the charging means, an original rest plate for supporting an original placed thereon for copying and exposing means having an exposing station located downstream from the charging means along the path of the photoreceptor for projecting an image of an original placed on the rest plate for copying onto a photoreceptor disposed at an exposing position at said exposing station, said device comprising moveable means disposed adjacent the charging means for selectively preventing the charging of selected side marginal portions of a photoreceptor moving towards the exposing means and means located at least at one of the longitudinal ends of the exposing means for discharging selected marginal portions at least at one of the longitudinal ends of a photoreceptor disposed at the exposing position, a width indicator visible from outside the copying apparatus and mounted for sliding movement along an edge of the rest plate transverse to said defined path and a length indicator visible from outside the copying apparatus and mounted for sliding movement along a longitudinal edge of the rest plate parallel to said defined path, means for linking the width indicator with the charge preventing means for moving the charge preventing means to a position for preventing the charging of selected side marginal portions of the photoreceptor as indicated by the position to which the width indicator has been moved, and means for linking the discharging means at the exposing station with the length indicator for discharging a selected marginal portion of the photoreceptor at its exposing position as indicated by the position to which the length indicator has been moved.