Support for sound record films

Sept 9, 1941.

A. D. STERN

SUPPORT FOR SOUND RECORD FILMS Filed Aug. 1, 1940

2,255,232

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ATTORNEY '

Patented Sept. 9,1941

2,255,232

UNITED STATES PATENT OFFICE

2,255,232

SUPPORT FOR SOUND RECORD FILMS

Albert D. Stern, Jamaica Estates, Long Island, N. Y., assignor to Becordgraph Corporation, New York, N. Y., a corporation of Delaware

Application August 1,1940, Serial No. 349,145 (Cl. 274—ID spliced portion of the 'film but not greater than twice such width. The groove extends across the support and. provides an unsupported area beneath the stylus ·. Its length is at least as great as that portion of the filmjipon which recordings are made. In Figure 2 the full lines show the spliced portion of the film slightly depressed tinder the weight of the stylus and its oooco &lt;u,u ......... __________ - support.’ In said-figure the dot and dash lines producing stylus. The support . is provided with W.1 show the position the film would take if it were

Claims, i

This invention relates to a support for a film having a spliced portion therein.

An object of the invention is to prevent the splice from causing an objectionable noise in the loud speaker when it passes under the reproducing stylus.

A feature of the invention consists in the provision of a stationary support over which the film passes and adjacept which is mounted the rea transverse groove providing an unsupported’, area beneath the stylus.

Further features and details of construction will be better understood from a consideration of the following description and claims tfhen ¹⁵taken in connection with the accompanying drawing in which:

Figure 1 is a perspective view of a support for the film, a portion of the film and the stylus; and ₍ •Figure 2 is a very much enlarged elevation, ‘ the support being shown broken away.

Tn the usual lap splice the thickness of the splice is usually double or more the thickness of the remaining portion of the film.

When the stylus strikes the splice it has a tendency to jump, due to this sudden increase in thickness. As a result of these sudden changes in thickness the stylus first bounces out of the sound track, alights on the film and bounces again one or two times until it comes to rest. Such action causes a click or thud in the loud speaker as the reproducing stylus passes over the splice.

, Referring to the drawing, I indicates a stationary support having a curved surface over which the film 2 passes^ Rollers 4 guide the film in its passage over the cylindrical portion of the support. The film adapted to be Used in the present invention is a continuous film, that is to say, its ends are spliced together and in Figure 2, the spliced portion of the film is shown at 5. The support I is provided with a transverse groove G which is preferably wider than the width of the not depressed.

Lap splices range in width from A of an inch to Va of an inch. By making the groove somewhat greater than the width of the splice, it has been found that the noise due to the splice passing beneath the stylus is very effectively reduced, if not entirely eliminated.

If the unsupported area beneath the stylus is too wide it leaves the film too free to sway under the load. If such unsupported area is too narrow it does not sufficiently suppress the splice noise since there is not roonr for the spliced area to recede under the stylus pressure. It has also been found that if the width of the unsupported area exceeds the splice width by one-eighth of an inch, good results are also obtained.