DE374065C - Drive the film reels on cinematographs - Google Patents
Drive the film reels on cinematographsInfo
- Publication number
- DE374065C DE374065C DEP41271D DEP0041271D DE374065C DE 374065 C DE374065 C DE 374065C DE P41271 D DEP41271 D DE P41271D DE P0041271 D DEP0041271 D DE P0041271D DE 374065 C DE374065 C DE 374065C
- Authority
- DE
- Germany
- Prior art keywords
- film
- cinematographs
- drive
- belt
- film reels
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/32—Details specially adapted for motion-picture projection
- G03B21/43—Driving mechanisms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Winding Of Webs (AREA)
- Replacement Of Web Rolls (AREA)
Description
Die Ränder der für Reihenbilder aufnahme und Wiedergabe benutzten Filme sind bekanntlich perforiert, um sie mit den gezahnten Mitnehmerrollen in Eingriff bringen zu können. Infolgedessen ist der Film gerade an den Stellen geschwächt, wo er die größte Widerstandsfähigkeit besitzen sollte. Da aber das Material, aus dem der Film hergestellt wird, an sich recht wenig widerstandsfähig ist, ist seine Festigkeit vielfach den verhältnismäßig großen Beanspruchungen, denen er bei <ter Fortschaltung ausgesetzt ist, nicht gewachsen, insbesondere, wenn die absatzweise Drehbewegung der Mitnehmerrolle größere Geschwindigkeit annimmt. Die Folge ist eine rasche Erweiterung der Randlöcher, die wieder eine unregelmäßige Wiedergabe der Bilder und häufiges Reißen des Films verursachen und es unmöglich machen, den Film so rasch durchThe edges of the for series pictures and playback used films are known to be perforated to match them with the serrated To be able to bring driver rollers into engagement. As a result, the film is just about to hit that Weak places where it should be most resilient. But there that The material from which the film is made is inherently not very resistant its strength in many cases the relatively great stresses it is subjected to Continuation is suspended, not grown, especially when the intermittent rotary motion the carrier roller assumes greater speed. The result is rapid expansion the edge holes, which again cause irregular reproduction of the images and frequent tearing of the film and it make it impossible to get the film through so quickly
ao den Apparat laufen zu lassen, als es nötig wäre, um die bekannten Flimmererscheinungen auszuschalten.ao to let the apparatus run when it was necessary to avoid the known flicker phenomena turn off.
Man hat wohl bereits mit endlosen Bändern arbeitende Einrichtungen vorgeschlagen, in denen der Film zwischen diesen Bändern läuft und durch sie gegen Reibung und Heißlaufen geschützt wird. Jedoch ist in diesen Einrichtungen das Bildband immer noch starken Zugbeanspruchungen unterworfen.Devices working with endless belts have probably already been proposed in which the film runs between these belts and through them against friction and overheating is protected. However, in these facilities the picture book is still subject to severe tensile stresses subject.
Gemäß der Erfindung werden nun diese Nachteile dadurch beseitigt, daß auch die auf- oder abzuwickelnde Filmspule durch ein endloses Mitnehmerband in Drehung versetzt wird. Dabei ruht die Spule mit ihrer äußersten Windung derart auf dem Mitnehmerband, daß ihr Gewicht zur Erzeugung der für ihre Mitnahme erforderlichen Reibung beiträgt.According to the invention, these disadvantages are now eliminated in that the on- or the film reel to be unwound is set in rotation by an endless carrier belt will. The coil rests with its outermost turn on the driver belt in such a way that that their weight contributes to the generation of the friction necessary for their entrainment.
Auf der Zeichnung ist ein Ausführungsbeispiel des Erfindungsgegenstandes dargestellt.An exemplary embodiment of the subject matter of the invention is shown in the drawing.
Die Achse der Spule 1 kann sich in einer Führung in lotrechter Richtung bewegen, und zwar unter der Wirkung ihres Gewichtes. Sie ruht auf dem oberen Teil eines endlosen Bandes 3, das über stetig sich drehende Trommeln 4 läuft.The axis of the coil 1 can move in a guide in the vertical direction, and although under the effect of their weight. She rests on the upper part of an endless one Belt 3, which runs over continuously rotating drums 4.
In dem Maße, in dem der Film 5, der mit dem Band 3 von α bis δ in Berührung ist, von diesem mit gleichbleibender Geschwindigkeit abgenommen wird, sinkt die Spule, da ihr Durchmesser stetig abnimmt, wobei sie sich mit gleichbleibender Umfangsgeschwindigkeit dreht.To the extent that the film 5, which is in contact with the belt 3 from α to δ, is removed from this at a constant speed, the coil sinks because its diameter is steadily decreasing, with a constant peripheral speed turns.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP41271D DE374065C (en) | Drive the film reels on cinematographs |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP41271D DE374065C (en) | Drive the film reels on cinematographs |
Publications (1)
Publication Number | Publication Date |
---|---|
DE374065C true DE374065C (en) | 1923-04-19 |
Family
ID=7377704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEP41271D Expired DE374065C (en) | Drive the film reels on cinematographs |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE374065C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2891736A (en) * | 1956-06-06 | 1959-06-23 | Viggo A Blaes | Automatic tape threading device |
-
0
- DE DEP41271D patent/DE374065C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2891736A (en) * | 1956-06-06 | 1959-06-23 | Viggo A Blaes | Automatic tape threading device |
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