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Bulletin No. 101.

CLOCK SYSTEM INSTRUCTIONS

RIBBON PROGRAM CLOCK

 

Webmaster's Note: This instruction bulletin accompanied a 1941 AR (now AR-3) master clock that was sold on ebay.  The winner of the auction was gracious enough to provide me with a photocopy of his original instruction manual.

Program mechanisms are mounted in either the master clock or separate case.

Program ribbons are of either 12 hour or 24 hour length.

(1) Where program mechanism is mounted in separate case, hang the case on the wall near the master clock by means of a strong screw through the hanger at top of the case. Then put a small screw through back of case near the bottom to hold the case securely in position, after which remove all cords from the movement that were placed there for shipping.

(2) A schematic wiring diagram is furnished with each clock system and this should be studied carefully to make sure that all connections are properly made on top of the master and program clock cases. The No. 8 terminal and the BC (bell common) bar should be connected to the source of power to be used for ringing bells. If this is to be the same DC source as is used for the clock system, a jumper wire should be connected between the No. 8 and the negative No. 1 bar and the common returns from the bells connected to the + bar. If a separate source of power such as a transformer no jumper wire is required and the transformer secondary leads should connect directly to the No. 8 and the BC bar.

PUNCHING SCHEDULE ON RIBBON

(3) A suitable punch for this purpose is included with all program clocks. Use this with the open side up so that the division lines on ribbon can be readily seen.  Punch hole exactly between lines, leaving a margin on the edge of the ribbon of about 1/16" uncut. This is necessary to retain strength of ribbon where cut and prevent curling of corners. Two schedules can be cut on each ribbon, one on each side of center holes.

TO PLACE PAPER RIBBON ON MOVEMENT

(4) All program clocks leave the factory with calendar drum or 12 hour shift set at 6 A.M., so that ribbon should be put on before program clock is started. At this position place ribbon on sprocket drum so that 6 A.M. on the ribbon comes directly where contact fingers meet contact bar, then down around the spool on the bottom left, then up around spook in center, then around bottom outside spool on right. Where 24 hour ribbon is used, a double set of idler spools are provided. When changing ribbon, be sure that it is replaced so the calendar drum changes when 6 A.M. on the ribbon is directly under the contact fingers.

CALENDAR DRUM

(5) This drum has one row of fourteen holes in alignment with each finger, one hole for each 12 hour period during the week, and a pin in any particular hole will hold finger out of contact and keep bells silent on the circuit that finger operates, for the twelve hours that the pin is in position. For example, hole in line with Monday on drum is open, pin is placed between Monday and Tuesday, left open Tuesday, pin between Tuesday and Wednesday, etc., to Saturday night, then pins in each hole to Sunday night. This allows finger to make contact Monday morning to Saturday night during the day and keeps the bells silent at night, also Sunday. This arrangement can be varied to suit any requirement by changing the position of pins or adding pins.

(6) If only one circuit of bells is to be operated, schedule can be varied for some particular reason by connecting the circuit to two or more of the connectors marked 1B, 2B, etc., and interchanging the pins on calendar drum according to the schedule desired, using one edge of the ribbon for part of the week and the other edge for the remaining day or days.

MANUAL CONTROL SWITCHES AND BUTTONS

(7) When program mechanism is mounted in separate case one push button and one single point switch for each circuit is located on the upper left hand side of the case. The switch lever when closed will allow bells to ring automatically on the particular circuit it controls according to the schedule punched on the ribbon. When the switch is open, bells will not ring automatically. The push button directly over the switch will ring bells on its particular circuit regardless of the position of switch or ribbon.

(8) Where the program is installed in the master case there will be no connectors marked No. 2 or No. 4 on top of the case. The switches will be in the back of the case at the bottom and the push buttons below the door on the outside. Other directions same as for program in separate case.

PROGRAM RELAYS

(9) The relays are adjusted at the factory and require no further adjustment. The contacts are made of tungsten and can easily be detached and renewed, although they have an extremely long life. The small graphite rod at the top of the relay is a high resistance shunt placed across the terminals of the magnet to quench the sparking at the contacts in the master clock.

STRAIGHT IMPULSE SYSTEMS

(10) This type is regularly furnished and the program and all secondary movements have one pair of driving magnets only. Before trying to put the program in operation a check should be made to determine if the system is of this straight impulse type or the automatic resetting type described below.

SETTING OF PROGRAM

(11) To set program movement on time with master clock the lower lever on the left of the movement depressed and released will move ribbon forward one minute for each depression. To run off several hours quickly, depress lever with one hand and with the other hand turn main ribbon drum, by the knurled nut in front, nearly up to time; then finish by moving ribbon to exact time by depressing lower left hand lever a sufficient number of times, care being taken in noting position of the second hand on master clock, as contact (for operating program mechanism) is made at 30th second for the next minute. For example, at 12:15 1/2 the program should move to 12:16. The 12 hour ribbon makes on complete round in 12 hours, and the 24 hour ribbon makes one complete round in twenty-four hours. At the end of the 12 hour period the black calendar drum moves forward one division. This controls the contact fingers by 12 hour periods, allowing the fingers to connect with contact bar through the properly punched holes or preventing the contacts according to the position of the pins placed in calendar drum. To set the calendar drum, set the ribbon forward as directed above until the drum moves one position, then advance it by depressing and releasing the upper left hand lever until it shows the proper day directly at the bottom, after which set the ribbon to time.

(12) If the program clock should by accident be set ahead of time, it will be necessary to spin the ribbon all the way around again or to stop it until the correct time is indicated by it.

AUTOMATIC RESET SYSTEMS

(13) The reset type of program movement has, in addition to the regular driving magnets and lever, a second pair of magnets for operating the resetting attachment. The latter pair of magnets receives an hourly corrective impulse from the master clock between the 59th and 60th minutes and operates a second lever which unlocks the driving mechanism from the center shaft upon which are mounted the ribbon driving pulleys, leaving the latter free to turn in either direction. A weight attached to one side of the shaft causes the latter to turn until the weight has swung around to the lowest position, moving the ribbons at the same time, so that when the movement comes to rest the ribbons should indicate the same time as does the master clock.

If the program movement is on time, however, the corrective impulse will have no effect.

SETTING OF PROGRAM

(14) To set this type of program movement which moves once a minute on the exact minute, it is necessary to first locate the setting lever directly to the left of the round front movement plate, and by alternately depressing and releasing it the ribbon will be advanced one minute at a time, meanwhile taking the following precaution -- while operating the lever with the left hand hold the tip of the right forefinger against the lower front edge of the ribbon pulley to prevent it from running ahead of the correct time when the weight previously referred to starts on its downward travel.

(15) The correct finger pressure required can be easily determined by trial and should be just great enough to allow the pulley to turn without getting out of control.

(16) If by chance the weight does start to swing around, the setting lever should be held down until the ribbons stop moving in order to prevent damage which might be caused by stopping the movement suddenly.

(17) If the program movement does get slow or fast twenty-five minutes or less it will be automatically reset at the next even hour, but if the gain exceeds twenty-five minutes it will be necessary to set the ribbons all the way around to the correct time.

(18) Be sure that the calendar drum is set correctly after each setting of the ribbons as the former may have moved while the latter were being set.

(19) It is possible to set the ribbons ahead by depressing the setting lever and with the right forefinger on the lower front edge of the ribbon driving pulley turning it to the left, although the lever must be released each time before the forefinger is removed from the pulley.

(20) The upper or calendar drum moves automatically at 6:00 A. M. and 6:00 P. M. but may be set at any time by removing the knurled brass screw at the front end, pulling the black lettered drum forward, turning it in either direction as desired until the correct period appears directly at the bottom, and then pushing it back into place. Be sure that the pin which extends inwardly from the wall of the drum engages the proper slot in the end of the bearing sleeve before replacing the screw.

(21) Be careful also when pushing the drum back into place that none of the pins extending outwardly from it are forced against the sides of any of the contact fingers.

(22) DON'TS FOR BOTH PROGRAM SYSTEMS

Don't lubricate any part of a program movement.
Don't forget to keep the door locked to keep out the dust.
Don't fail to examine the connections on the top of the case to be sure that they are tight.
Don't leave the switches open and expect the clock to ring bells automatically.
Don't forget to see that the calendar drum is set correctly before setting the ribbon.
Don't punch the holes in the ribbon on the line, for they should be punched between the lines.
Don't punch the holes in the ribbon too near or too far away from the edge; 1/16" from the edge is correct.
Don't bend the fingers that make the contact through the ribbon; they are adjusted at the factory and should not be changed. The end of the finger should rest on the ribbon midway between the lines, not on the line.

(23) For further information address home office or nearest branch.

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