Facsimile apparatus

Claim 2

Facsimile apparatus including a scanning assembly, two carriages in said scanning assembly, a facsimile scanning head in each carriage, two parallel tracks defining paths of movement for said carriages respectively, a pulley having an axis of rotation, an inextensible flexible tensioned band passing around said pulley and connected at its opposite ends to respective carriages to move them in antiphase with one another, tensioning means acting on said carriages and maintaining said band in tension, a drive coupled to one of the carriages and operating to move the carriage back and forth along its rail, and an adjustment device operable to displace the pulley axis parallel to itself whereby the relative positions of the two carriages on their respective tracks may be altered.

Claim 3

Apparatus as set forth in claim 1, in which said pulley is disposed at one end of a pair of rails providing said tracks and is displaceable towards and away from the ends of said rails.

Claim 4

Apparatus as set forth in claim 2, in which said band comprises a stainless steel cable.

Claim 5

Facsimile apparatus including a scanning assembly, two carriages in said scanning assembly, a facsimile scanning head in each carriage, two parallel tracks defining paths of movement for said carriages respectively, a first pulley having an axis of rotation, an inextensible flexible tensioned band passing around said first pulley and connected at its opposite ends to respective carriages to move them in antiphase with one another, a second pulley, a flexible tensioned expandible second band passing around said second pulley and connected at opposite ends to respective carriages said second band extending away from said carriages on the opposite sides thereof to said first band, a drive coupled to one of the carriages and operating to move the carriage back and forth along its track, and an adjustment device operable to displace said first pulley axis parallel to itself whereby the relative positions of the two carriages on their respective tracks may be altered.

Claim 6

Facsimile apparatus including a scanning assembly, two carriages in said scanning assembly, a facsimile scanning head in each carriage, two parallel tracks defining paths of movement for said carriages respectively, a first pulley having an axis of rotation, an inextensible flexible tensioned band passing around said first pulley and connected at its opposite ends to respective carriages to move them in antiphase with one another, a second pulley, a flexible tensioned expandible second band passing around said second pulley and connected at opposite ends to respective carriages said second band extending away from said carriages on the opposite sides thereof to said first band, a drive coupled to one of the carriages and operating to move the carriage back and forth along its track, and an adjustment device operable to displace said first pulley axis parallel to itself whereby the relative positions of the two carriages on their respective tracks may be altered.

Claim 7

Apparatus as set forth in claim 4, in which the second band is formed by a stainless steel cable connected in series with a spring and passing around said second pulley which is mounted adjacent one set of ends of rails providing said tracks, said first pulley being mounting adjacent the other ends of said rails.

Claim 8

Facsimile apparatus including a scanning assembly, two carriages in said assembly, a facsimile scanning head in each carriage, two parallel tracks defining paths of movement for said carriages respectively, a first pulley having a displaceable axis of rotation, an inextensible flexible tensioned band passing around said first pulley and formed by a stainless steel cable connected at its opposite ends to respective carriages to move them in antiphase with one another, a second pulley, a flexible tensioned expandible second band formed by a staiNless steel cable connected in series with a spring and passing around said second pulley said second band being connected at opposite ends to respective carriages and extending away therefrom on the opposite side to said first band, a drive coupled to one of the carriages and operating to move the carriage back and forth along its track, a belt loop forming part of said drive, a constant speed electric motor driving said belt loop, a cross-member extending transversely away from one side of said belt loop, a sliding coupling interconnecting said cross-member with said one carriage to produce forward and return strokes thereof with rotation of said belt, a threaded member providing an adjustment device operable to displace the first pulley axis parallel to itself and parallel to the longitudinal axes of said rails whereby the relative positions of the two carriages on their respective tracks may be altered.

Claim 9

Facsimile apparatus including a scanning assembly, two carriages in said assembly, a facsimile scanning head in each carriage, two parallel tracks defining paths of movement for said carriages respectively, a first pulley having a displaceable axis of rotation, an inextensible flexible tensioned band passing around said first pulley and formed by a stainless steel cable connected at its opposite ends to respective carriages to move them in antiphase with one another, a second pulley, a flexible tensioned expandible second band formed by a staiNless steel cable connected in series with a spring and passing around said second pulley said second band being connected at opposite ends to respective carriages and extending away therefrom on the opposite side to said first band, a drive coupled to one of the carriages and operating to move the carriage back and forth along its track, a belt loop forming part of said drive, a constant speed electric motor driving said belt loop, a cross-member extending transversely away from one side of said belt loop, a sliding coupling interconnecting said cross-member with said one carriage to produce forward and return strokes thereof with rotation of said belt, a threaded member providing an adjustment device operable to displace the first pulley axis parallel to itself and parallel to the longitudinal axes of said rails whereby the relative positions of the two carriages on their respective tracks may be altered.

Claim 10

Facsimile apparatus as set forth in claim 6, in which the adjustment device comprises a screw extending parallel to said rails and passing through a threaded hole fixed in relation to said apparatus said first pulley having its rotational axis fixed to one end of said screw.