US842251A - Roller-blind shutter for photographic cameras. - Google Patents

Description

No. 842,251. 7 PATENTBD JAN. 29, 1907,

0. SASSE. ROLLER BLIND SHUTTER FOR PHOTOGRAPHIG CAMERAS.

APPLICATION FILED 0OT.25. 1905.

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fix, Gag/ i i M1 CARL SASSE, OF DRESDEN, GERMANY.

ROLLER-BLIND SHUTTER FOR PHOTOGRAPHIO CAMERAS.

Specification of Letters Patent.

Patented Jan. 29, 1907.

(application filed October 25. 1905. Se1'ialNo.Z8 l,339.

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Be it known that l, CARL Siissn, a subject of the lhn Jeror of Germany and. a resident of Dresden, Germany, have invented new and useful lmprovements in Roller-Blind Shutters tor Photographic Cameras, of which the following is a specification.

The improved roller-blind shutter belongs to that class of such shutters in which one portion of the blind. is adjustably mounted on the tapes or cords of the other portion of the blind.

In the accompanying drawings, Figure 1 is a front elevation of the improved roller-blind shutter; and Figs. 2 and 3 are side views thereof, shmving it inv ditlerent positions.

According to the invention the improved shutter consists cl a resetting fabric or blind a, fast onto the resetting-roller e, which serves to draw the blind. up. Another piece of fabric l), constituting a motor-blind, is secured to the spring motor-rollerf and has secured to its upper end a revoluble exposureslot-regulating roller (Z. To the lower end of the upper rc ctting-blind a is secured. a bar 0, carrying at its extremities the tapes or cords 3, whose other ends are secured to the motorroller f and wind or unwind with the motorblind b on the said roller f, while, moreover, they are given a single turn around the projecting ends of the roller (Z. The tapes or cords wind and unwind upon the exposureslot-regulating roller in the opposite direction from that in which the motor-blind. winds and unwinds thereon. The distance between the bar 0 and roller (1 forms the exposureslot. By turning the knob k for setting the shutter both. parts a and l) of the shutter are moved upward, with the exposure-slot-regw lating roller (15 and bar a close together. (See Fig. 2.)

The upper part or resetting-blind a is con sequently rolled onto the resetting-roller 6, while the lower part or motor-blind l) by reason of the projecting ends of the regulating-roller (Z meeting with and being held by stops 9 becomes rolled on the regulatingroller (1. The rotation of roller (Z is caused by the continued upward travel of the tapes or cords 8. Thus the more the upper or resetting blind is rolled up the larger will become the exposure-slot.

Any known device may be adopted for releasing the shutter in order to make the exposure. hen the shutter is released, the

exposure slot regulating roller d strikes cords s to do likewise.

against the stops it at the lower end, as indicated in 3, the tension of the spring or motor roller f causing the motor-blind b to unroll from the exposureslotregulating roller (Z and fully roll upon the motor-roller while at the same time causing the tapes or This results in the bar (1 and regulating-roller d being brought close together, which position they maintain at the commencement of the resetting of the shutter. The stops it are preferably yielding to cushion the regulating-roller, as may be done by making them of spring metal.

I claim- 1. A roller-blind shutter for photographic cameras with a variable exposure-slot comprising, in combination, a motor-roller and a motor-blind secured thereto a resetting-roller and a resettingblind secured thereto, the exposure-slot being formed between the adjacent cxposure edges of the two blinds a barsccured to the exposure edge of the resettingblind; an exposure-slot-regulating roller secured to the exposure edge of the motor blind. upon. which said blind may wind and unwind; tapes or cords secured to said bar and winding and unwinding upon said exposure-s](it-regulating roller oppositely to the way the motor-blind. winds and unwinds threon; and stops to engage the exposureslot-regulating roller and stop its travel, both following the exposing and in resetting; whereby the rotation of the resetting-roller after the onward travel of the exposure-slotregulating roller has been stopped rotates the ex )osure-slot-regulating roller, thereby 'winding the motor-blind. thereon and increasing the size of the exposure-slot.

2. A roller-blind shutter for photographic cameras with a variable exposure-slot comprising, in combination, a motor-roller and a motor-blind secured thereto; a resettingroller and a resetting-blind secured thereto, the exposure-slot being formed betweenthe adjacent exposure edges of the two blinds an exposure-slot-regulating roller secured to the exposure edge of the motor-blind upon which said blind may wind and unwind; tapes or cords secured to said resetting-blind and winding and unwinding upon said exposureslot-regulating roller oppositely to the way the motor-blind winds and unwinds thereon, and stops to engage the exposureslot-regulating roller and stop its travel, both following the exposing and in resetting; whereby the rotation of the resetting-roller ITO after the onward travel of the exposure-slotregulating roller has been stopped rotates the exposure-s10t-regulaung roller, thereby winding the motor-blind thereon and increasing the size of the exposure-slot.

3. A roller-blind shutter for photographic cameras with a variable exposure-slot oomprisii'ig, in combination, a motor-roller and a motor-blind secured thereto; a resettingroller and a resetting-blind secured thereto, the exposure-slot being formed between the adjacent exposure edges of the two blinds; an exposure-slot-regulating roller secured to the motor-blind and upon which said blind may wind and unwind; tapes or cords secured to said resetting-blind and winding

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