Method of and apparatus for obtaining synchronous movement between two media

In an apparatus having means for simultaneously processing two independently movable recordbearing stips, in combination:

• first drive means for intermittently advancing a first record strip provided with at least one first marking;
• second drive means for continuously advancing a second record strip provided with a sequence of second markings having a discontinuity in a zone entering the processing means substantially simultaneously with a part of said first strip identified by said first marking;
• first sensing means for detecting said first marking on said first strip and emitting a first output signal in response thereto;
• second sensing means for detecting said second markings on said second strip and emitting a series of second output signals in response thereto, said first drive means being connected to said second sensing means for actuation by said second output signals to step said first strip in response to said second markings;
• coincidence means connected to said first and second sensing means for emitting a switching signal upon simultaneous reception of said first and second output signals;
• control means for said first drive means connected to said coincidence means for halting the advance of said first strip in response to said switching signal in a position in which said first marking confronts said first sensing means;
• and
• delay means inserted between said second sensing means and said coincidence means for retarding the effect of a recurrence of said second markings upon said coincidence means, thereby enabling renewed actuation of said first drive means by said second output signals in response to the second markings which follow said discontinuity.