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WURLITZER CALIOLA RESTORATION (Part 20)
ROLL FRAME RESTORATION


by Dr. Bill Black

In this case, the roll frame is in very good condition basically only requiring some cosmetic work. In PHOTO A we have installed the roll frame on the shelf. As shown in previous photos, the wooden block on which the tracker bar is mounted is attached to the metal tracker bar tubing. This block is mounted on 2 rods. These rods must be installed before the speed control unit for the roll frame is mounted. Otherwise there is not enough clearance to be able to place the rods in a position to slide the rods through the sides of the roll frame. PHOTO A shows one of these rods in position to slide it through the sides of the roll frame and the mounting tabs on the wooden block.


PHOTO B shows the unit that triggers the rewind function on the roll frame. This consists of a unit valve and a pneumatic. When the hole in the music roll triggers the valve, the pneumatic collapses. The tab on the pneumatic moves the vertical rod into contact with a rotating wheel on the roll frame drive shaft. A small stud engages the rod, depresses it downward and the roll frame is shifted into the rewind mode.To the right of the rewind unit is a slider valve which when moved to the position to admit air, will operate a transfer type block on the back of the shelf. Internal pouches inflate to block off the connection between the tracker bar and the stack valves. This mutes the tracker bar so the Caliola may be played by the keyboard instead of the music roll.



PHOTO C shows the restored speed control unit which mounts on the side of the case and provides a means to adjust the speed of the roll to set a proper tempo for the music. The small parts in the picture when mounted on the case serve to move the drive disc away from the leather faced disc and interrupt the movement of the roll frame. The speed of the roll frame is varied by moving the leather faced disc up or down by means of a crank arrangement mounted on the outside of the case.



PHOTO D shows the completed installation of the roll frame and drive train. Note the crank arrangement referred to above which is attached to an arm and fork arrangement to move the leather faced drive disc up or down. Also visible is the small rotating wheel on the drive shaft described above to shift the roll frame into rewind.



Dr. Bill Black is one of the nation's most knowledgeble Wurlitzer band organ experts. He has made recordings of many band organs and other mechanical music machines which are available for purchase in our Gift Shop .

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