Light intercepting screen winding and paying-out device for copying machines

Claim 2

A light intercepting screen winding and paying-out device for copying machines comprising, in combination, a movable optical system mounted for reciprocation between, anD along a travel path parallel to, an original, to be duplicated, and a photosensitive sheet, arranged in spaced parallel relation to each other, to expose the photosensitive sheet progressively to an optical image of the original; a pair of screen winding rollers, freely rotatable in both directions, rotatably mounted in parallel relation to each other at respective ends of said travel path and extending transversely of said travel path; a pair of light intercepting screens each connected, at one end, to a respective end of said optical system and, at the other end, to a respective roller; driving means, including an element directly connected to said optical system and coupled to both of said roller independently of said optical system, operable to reciprocate said optical system while rotating one roller in the screen winding direction and the other roller in the screen paying-out direction.

Claim 3

A light intercepting screen winding and paying-out device for copying machines, as claimed in claim 1, including a respective fixed shaft rotatably supporting each winding roller; said driving means including a respective drive member rotatably mounted on each fixed shaft; and respective means connecting each drive member to its associated winding roller.

Claim 4

A light intercepting screen winding and paying-out device for copying machines, as claimed in claim 2, in which each connecting means provides limited relative angular displacement between the associated drive member and the associated winding roller.

Claim 5

A light intercepting screen winding and paying-out device for copying machines comprising, in combination, a movable optical system mounted for reciprocation between, and along a travel path parallel to, an original, to be duplicated, and a photosensitive sheet, arranged in spaced parallel relation to each other, to expose the photosensitive sheet progressively to an optical image of the original; a pair of screen winding rollers rotatably mounted in parallel relation to each other at respective ends of said travel path and extending transversely of said travel path; a pair of light intercepting screens each connected, at one end, to a respective end of said optical system and, at the other end, to a respective roller; driving means operatively connected to said optical system and to both of said rollers operable to reciprocate said optical system while rotating one roller in the screen winding direction and the other roller in the screen paying-out direction; a respective fixed shaft rotatably supporting each winding roller; said driving means including a respective drive member rotatably mounted on each fixed shaft; and respective means connecting each drive member to its associated winding roller; each connecting means providing limited relative angular displacement between the associated drive member and the associated winding roller; and comprising a torsion spring embracing the associated fixed shaft and having one end secured to the associated drive member and its opposite end secured to the associated winding roller; said torsion springs compensating for differing thicknesses of screen wound on the associated rollers.

Claim 6

A light intercepting screen winding and paying-out device for copying machines comprising, in combination, a movable optical system mounted for reciprocation between, and along a travel path parallel to, an original, to be duplicated, and a photosensitive sheet, arranged in spaced parallel relation to each other, to expose the photosensitive sheet progressively to an optical image of the original; a pair of screen winding rollers rotatably mounted in parallel relation to each other at respective ends of said travel path and extending transversely of said travel path; a pair of light intercepting screens each connected, at one end, to a respective end of said optical system and, at the other end, to a respective roller; driving means operatively connected to said optical system and to both of said rollers operable to reciprocate said optical system while rotating one roller in the screen winding direction and the other roller in the screen paying-out direction; a respective fixed shaft rotatably supporting each winding roller; said driving means including a respective drive member rotatably mounted on each fixed shaft; and respective means connecting each drive member to its associated winding roller; each connecting means providing limited relative angular displacement between the associated drive member and the associated winding roller; and comprising a torsion spring embracing the associated fixed shaft and having one end secured to the associated drive member and its opposite end secured to the associated winding roller; said torsion springs compensating for differing thicknesses of screen wound on the associated rollers.

Claim 7

A light intercepting screen winding and paying-out device for copying machines comprising, in combination, a movable optical system mounted for reciprocation between, and along a travel path parallel to, an original, to be duplicated, and a photosensitive sheet, arranged in spaced parallel relation to each other, to expose the photosensitive sheet progressively to an optical image of the original; a pair of screen winding rollers rotatably mounted in parallel relation to each other at respective ends of said travel path and extending transversely of said travel path; a pair of light intercepting screens each connected, at one end, to a respective end of said optical system and, at the other end, to a respective roller; driving means operatively connected to said optical system and to both of said rollers operable to reciprocate said optical system While rotating one roller in the screen winding direction and the other roller in the screen paying-out direction; a respective fixed shaft rotatably supporting each winding roller; said driving means including a respective drive member rotatably mounted on each fixed shaft; and respective means connecting each drive member to its associated winding roller; said drive members being rotatable pulleys; said driving means including an endless belt trained over said pulleys and having its opposite ends connected to said movable optical system; and a driving pulley operatively engaged with said endless belt to drive the latter to rotate said pulleys and the associated winding rollers conjointly.

Claim 8

A light intercepting screen winding and paying-out device for copying machines comprising, in combination, a movable optical system mounted for reciprocation between, and along a travel path parallel to, an original, to be duplicated, and a photosensitive sheet, arranged in spaced parallel relation to each other, to expose the photosensitive sheet progressively to an optical image of the original; a pair of screen winding rollers rotatably mounted in parallel relation to each other at respective ends of said travel path and extending transversely of said travel path; a pair of light intercepting screens each connected, at one end, to a respective end of said optical system and, at the other end, to a respective roller; driving means operatively connected to said optical system and to both of said rollers operable to reciprocate said optical system While rotating one roller in the screen winding direction and the other roller in the screen paying-out direction; a respective fixed shaft rotatably supporting each winding roller; said driving means including a respective drive member rotatably mounted on each fixed shaft; and respective means connecting each drive member to its associated winding roller; said drive members being rotatable pulleys; said driving means including an endless belt trained over said pulleys and having its opposite ends connected to said movable optical system; and a driving pulley operatively engaged with said endless belt to drive the latter to rotate said pulleys and the associated winding rollers conjointly.

Claim 9

A light intercepting screen winding and paying-out device for copying machines, as claimed in claim 5, in which said belt is a toothed belt having gear teeth on one surface; said pulleys comprising gear pulleys having gear teeth on their periphery engaged with the teeth of said toothed belt.