Abstract:
A photographic printing apparatus wherein the light-transmitting window at the printing station is defined by several masks which are movable with reference to each other to adjust the size of the window in dependency on the format of frames in the roll film which is being copied. The movements of masks are synchronized and one of the masks adjusts the reflector of a previewing device which permits visual inspection of one or more frames immediately ahead of the printing station.
Abstract:
Apparatus for detecting intercepting and guiding the leader of photographic film which is convoluted on a spool within a convoluted backing strip whose front portion extends beyond the leader of the film has a bearing which rotatably supports a spool and a drive which rotates the spool in a direction to pay out the film and the backing strip. A deflector is biased against the outermost convolution of the backing strip on the rotating spool to deflect the front portion of the backing strip into a first path while simultaneously preventing entry of the leader of film into a second path wherein the leader is to advance toward a splicing station to be joined with the trailing end of a preceding film. A photoelectric detector scans the path for the backing strip and produces a signal in response to detection of the front portion whereby such signal causes a rotary electromagnet to move the deflector out of register with the inlet of the path for the leader so that the leader can enter such path in response to further rotation of the spool. Prior to rotation in a direction to pay out the film and the backing strip, the spool is rotated in the opposite direction and is arrested by a tracking device having a nozzle which attracts the front portion of the backing strip in such angular position of the spool that the front portion of the backing strip is located between the points of engagement of the backing strip with the drive means and with the deflector. Such orienting of the spool can be carried out prior to introduction into the bearing.
Abstract:
A photographic copying machine wherein the copying station is located between two feeding stations for a web of photographic material. The web is guided by fixedly mounted and pivotable guide members which define at each feeding station an opening through which loop-shaped intermediate portions of the web can enter a basket-shaped magazine. Two intermittently driven wheels at the first feeding station draw the web from a supply cassette and feed it directly into the adjacent magazine from which the web is withdrawn by intermittently driven wheels at the second feeding station whereby the web enters the other magazine from which it is withdrawn in response to rotation of the takeup reel in a second cassette. Pivotable flaps can seal the magazines from the path for the web during threading of the leader of a fresh web into the copying machine, and forked intercepting devices are provided adjacent to the magazines to intercept folded-over portions of the web.
Abstract:
Apparatus for transporting webs of photosensitive material in a copying machine has a driven takeup reel which collects exposed material and intermittently driven advancing rolls which withdraw the material from a supply reel in stepwise fashion. A mechanical or electromagnetic friction brake is interposed between the advancing rolls and the takeup reel to abruptly interrupt the transport of material toward the takeup reel, either in response to completed transport of the material by a step or during transport of material by the advancing rolls. The mechanical brake employs an idler roll or a tensioning roll which changes its position in response to changing tension of the material. The electromagnetic brake has an armature which biases the material against a stationary back support in response to energization of the electromagnet which latter is energized when the motor for the takeup reel is idle of vice versa.
Abstract:
EACH FILM STRIP HAS MARGINAL NOTCHES THAT INDICATE FORMAT LENGTH OF THE FRAMES OF A FILM STRIP. THESE NOTCHES ARE SENSED BY FEELERS THAT, IN ONE EMBODIMENT, ACTUATE SWITCHES THE CONTROL OPERATION OF A MOTOR FOR POSITIONING THE MASKING ELEMENTS FOR PRINTING. IN ANOTHER EMBODIMENT, A DIGITAL CIRCUIT IN CONJUNCTION WITH THE FEELERS AND
A PULSE GENERATOR AUTOMATICALLY DETERMINE THE AVERAGE FORMAT LENGTH WITHIN A FILM STRIP AND PROVIDES A SIGNAL FOR OPERATING THE MOTOR TO POSITION THE MASKING ELEMENTS.
Abstract:
A braking device for shutter blades or the like which comprises a pivotable actuating member normally extending into the path of movement of the blade and serving to displace a braking member which is thereby urged against the blade, preferably in a direction at right angles to the direction of movement of the blade, to produce a controlled braking action. The braking member is integral with or is coupled to the actuating member by a torsion spring or the like. Elastic cushions are provided on the actuating and braking members in such positions that the cushion of the actuating member is struck by the moving blade and the cushion of the braking member strikes against the blade in response to resulting displacement of the actuating member.