SU24836A1 - Roller Shutter for SLR Camera - Google Patents

Description

In the proposed curtain shutter for a SLR camera, the slit transfer is made by slightly opening the crown and moving it, depending on the desired speed, to the right or left. The velocities are read from the circle placed at the base of the crown, which eliminates the need to calculate the velocities over the slit width. Velocities are calculated by the factory in the manufacture of valves.

In FIG. 1 shows a side view of the upper roller with a partial cut; FIG. 2 - vertical section of the crown; FIG. 3 - the same, top view; FIG. 4 is a front view of a shutter with a trigger; FIG. 5 is a view of a modified trigger.

The proposed shutter shutter consists of a trigger mechanism (Fig. 4), the upper arm (Fig. 1) and two lower rollers with helical springs inside (the drawing is not shown). An upper curtain is attached to the middle segment 3 of the upper roller (Fig. 1), and ribbons of the lower curtain are wound on the outermost 6, made in the form of drums 9. For the factory, i.e., for winding the shutters, handwheel 2 serves on axis 1, which rotates the middle segment 3, and for simultaneous rotation of the reels 6 serves disk 5, the teeth of which grab the ratchet 13 and turn the sleeve 7 connected with it. , and with it the drums 6

(phpg. 1). The sleeve 7 is equipped with a disk S, to which a spring is pressed against the disk 10 of the drum 9.

To adjust the width of the gap between the shutters, a winder gear 5 (FIG. 2) is used, connected to the head / equipped with a cylinder 8 with a protrusion 4, carrying a pin for jumping into one of the wheel holes 5. The wheel 5 is attached with dns screws with cylindrical, partially cut projection b so that it can move in the slot (protrusion 4 with a pin, touch directly to the wheel 5. The latter has a limited movement, rotating at the factory until the end of the protrusion 4 reaches the protrusion on the bar 7, when back m movement until the protrusion 5 rests against the stop and (Fig. 4). Thus, the farther from the protrusion on the rod 7 the end of the protrusion 4 is placed with a pin in the hole of the wheel 5, the longer the path of the latter around its axis and the wider the gap between the shutter curtains.

The trigger mechanism (Fig. 4) consists of a lever y connected by a plate d with one of the protrusions of the plate e for setting the end a of the lever against the respective zones with stops 8 or 9, 10 on the wheel 5.

With the position of the parts shown in FIG. 4, the shutter is put on for a long exposure by two pressing the button down. When you press the button,

"I therefore, both on the dog s protrusion g of the lever y, the wheel 5 is released and, under the influence of the spring pressure in the lower shutter rollers, rotates until the protrusion of the lever r / up is lifted up into the protrusion 8 on the wheel 5. At this time, the protrusion is released, the protrusion reverts to its previous position, the dog h, having missed one or two teeth on the wheel 5, delays the latter, and the shutter opens.

To close the shutter, by pressing the button, the dog s is pulled out, the protrusion 8 passes by the protrusion a, and the wheel 5, not delayed by anything, rotates all the way into the stopper and the shutter closes. For short exposures with one pressure, the protrusion d is translated into the plate e one tooth lower. At this time, the protrusion moves to a more central area of the wheel, where two protrusions 9 and 10 are located. The shutter is turned on until the protrusion 9 drops beyond the end of the protrusion a of the lever y. To bring the shutter in motion, press, as before, the button g. The protrusion leaps from the protrusion 9, the wheel is driven into rotation and is bumped by the protrusion 10 onto the protrusion a. The open curtains stop and remain in that position until the button W is released, after which the curtains fall down and the shutter closes.

For instant exposures, the protrusion, moving the movable protrusion d under the lower tooth of plate e, moves along the wheel 5 closer to its center in an area where there are no obstacles. To actuate the shutter, the dog is placed on top of the teeth of the dog teeth by releasing it by installing a mirror at an angle of 45 ° to the optical axis. The gate is lowered by pressing the button, which exerts pressure on the dog L, mounted on the through rod, with two hooks that capture the front edge of the mirror. The hooks, going forward, release the mirror, which, under the influence of the spring pressure, moves up and knocks the dog m. Wheel 5 is released and the shutter with a predetermined slot passes in front of the plate.

The modified trigger for the collapsible chamber on the struts (Fig. 5) consists of the lever described above with four protrusions a, b, c, d, a movable bar e on which a rotating flat disk e with a spiral slot is fixed, in which it rotates during rotation pin secured at the end of the projection c. In this way, the protrusion a is moved to the corresponding zone of the wheel 5. In. The shutter speed of the dog with its sharp end is removed from the teeth of the wheel. 5 When the projection is transferred to instantaneous exposures, the sharp end of the dog and m falls between the teeth of the wheel 5. When the valve is turned, it prevents the reverse rotation of the wheel. When pressing the trigger end of the bar, the protrusion b pushes the blunt end of the dog m and releases its opposite end from the teeth of the wheel 5. Thus the wheel is released and the slit of the bolt of the set width passes in front of the plate.

The subject of the patent.

1. A curtain valve for a SLR camera, characterized in that the upper roller is composed of a middle section 3, which serves to wind the upper curtain, and of two extreme 6, made in the form of drums 9 and intended to wind the lower curtain ribbons, of which the middle roller is connected with an axis / for rotation by its handwheel 2, and for simultaneous rotation of the reels 6 also serves a disk 5 with a tooth coupled to a ratchet 13 connected by a long key to a sleeve 7 equipped with a disk 5 to which the disk 10 of the drum 9 is pressed by a spring below the width between the shutters, the winding gear 5 (FIG. 2) is connected to the head / equipped with a cylinder 3 with a protrusion 4 bearing a pin, which falls into one of the holes of the wheel 5.

2.When the shutter., Specified in paragraph 1., use the trigger mechanism, consisting (Fig. 4) of the lever y, connected by a plate d with one of the protrusions of the plate e to install the end a of the lever against the respective zones with stops 8 or 9 , 10 on the wheel 5.

3. Change of the trigger mechanism specified in clause 2, characterized in that the end of the lever y is connected to the trigger bar g by means of a pin, which is inserted into the slot of the rotary plate e attached to the bar g (Fig. 5). to the patent of the All-Union Trust of Industry H2 of the optical-mechanical 24836