Abstract:
A long play film cartridge and projector wherein an endless loop of film may be nine hundred to 5,000 feet or more in length and which may be used to project a series of pictures continuously; the cartridge having a novel dish shaped film holding rotor of a material having a particular coeficient of surface friction with radiating film supporting ridges having upper surfaces declining downwardly from the outer periphery towards a central hub which is surrounded by a flat ring shaped surface portion with which the inner ends of said ridges are substantially flush, whereby a large spiral roll of film is carried on said film holding rotor and is fed therefrom near said hub where the relative center of said spiral roll is automatically maintained in loosely packed convolutions; said projector operated at a lower linear film rate than the linear film rate of said film holding rotor and the film holding rotor is actuated intermittently in response to tension on displacement of said film created by demand of said projector.
Abstract:
A tape cartridge for containing an endless coil of tape, the cartridge having a rotatable tape reel upon which the tape is wound, and openings in the cartridge along one wall thereof exposed to the tape feeding and tape recording and reproducing mechanism of a recording playback instrument with which the cartridge is to be used, the tape being wound on the reel for feeding in an open loop from the innermost convolution of the coil, past the openings in the cartridge and back to the outermost convolution of the coil.
Abstract:
An adjustable speed projector including a continuously running shutter for repetitively interrupting the projection light path at a rate which is independent of the film frame rate, a source of film frame advance signals having a repetition rate controllable by an operator, and means for advancing a film by one frame in response to each advance signal at a time corresponding to the next succeeding interruption of the projection light path by the shutter so that the film is in motion only at times when the shutter interrupts the light path. The film-advancing mechanism includes a continuously rotating drive wheel, a driven wheel which is caused to engage the drive wheel for one cycle in response to each actuating signal, and a claw, one end of which is eccentrically mounted on the driven wheel and the other end of which engages a film sprocket hole to advance the film by one frame for each cycle of the driven wheel. A single spring urges the driven wheel into engagement with the drive wheel and also urges the claw into engagement with the film and against a lateral guide surface. Two-channel recording and playback apparatus is provided so that film frame advance signals recorded in synchronism with a sound track may be used to control the projector in the playback mode.
Abstract:
A film magazine carries an endless film which is wrapped about a hub portion on a flange extending at a right angle to the axis of the hub, the hub having a first cylindrical portion in contact with the inntermost convolution of the film near the flange, and having a tapered hub portion remote from the flange. A rib within the cover of the film magazine which maintains the film convolutions on the hub in proper position is recessed at the point where it overlies the innermost film convolution and a portion of the tapered surface portion, the rib being positioned circumferentially at the point where the innermost convolution leaves the hub, the depth of the recess within the rib and the demarcation between the tapered portion of the hub and the cylindrical portion of the hub is approximately equal to the thickness of the film to insure edge contact only between the innermost convolution and the point of removal from the hub and the tapered surface portion of the hub and the rib respectively.
Abstract:
There is disclosed herein a capstan and pinch roller assembly for use in moving material in strip form, such as for moving motion picture film in a cartridge-loaded motion picture projector. The pinch roller is pivotally mounted and normally remains in a rest position for allowing entry of a film cartridge or the like into the machine. Insertion of the cartridge into the machine engages a member of the pinch roller assembly to move the roller into a second position, from which it is then moved to a final, capstan-engaging, position by means of an electromagnet. The electromagnet thus serves to finally position the roller, and to properly bias the pinch roller against the capstan. A suitable sound pick-up, such as an optical or magnetic pick-up, also may be positioned by movement of the pinch roller assembly. This invention relates to apparatus for moving webs of strips of material and more particularly to an improved pivotally mounted pinch roller assembly for use with cartridge loaded motion picture projectors and the like.
Abstract:
A flexible tape-catching ring whose circumference is longer than that of the core of a reel is loosely wrapped around the core. Upon rotation of the reel at high speed, the catching ring is revolved around the core and becomes elongated due to centrigugal force to catch the leading end of a tape or the like and to wind the tape or the like around the core.
Abstract:
The exposed emulsion layer on a transparent carrier of motion picture film is converted into a relief pattern which is thereupon transferred onto a master record. The master is used for the making of duplicate films and the images represented by relief patterns on the duplicate films are reproduced by a Schlieren process or a phase contrast process.
Abstract:
A spindle for rotatably supporting a reel having both positive and frictional engagement between the spindle and the reel. The positive engagement is made at one end of the spindle, as by means of plural pins which engage plural recesses in the reel. The frictional engagement is made at the other end of the spindle and is provided by a radially expansible elastomer which is expanded by a locking arm. This dual engagement advantageously holds two-piece reels together as well as to the spindle.
Abstract:
A motion picture projector wherein the top wall of the housing supports a detachable upright duct for a stack of horizontal film-containing cassettes. The lowermost cassette of the stack dwells in a projection position in which the film can be automatically withdrawn from such cassette to be threaded through the projector and attached to the core of the takeup reel. An automatic rewinding unit rewinds the film onto the supply reel in the cassette occupying the projection position, and such cassette is thereupon expelled from projection position by a pusher to enter a detachable collecting receptacle. The lowermost cassette of the stack in the duct descends by gravity and occupies the projection position when the pusher returns to its retracted position. The guide means wherein the film passes from the supply reel in the cassette occupying the projection position to the takeup reel in the housing of the projector has a channel which twists the film through 90*.
Abstract:
A sheet film curl correcting device so operative that it is closed towards the leading edge of a sheet film in association with the operation of a film inserting mechanism, immediately before said sheet film is inserted into a predetermined position of a film magazine, thereby to guide said film from both sides with a slight space therebetween, and is opened immediately after the leading edge of the film has been inserted into the magazine.