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Describes the watch movement's basic structure, power source, and key components like the balance and energy cell.
Covers energy cell specifications, replacement, and the mechanism for setting hands and stopping the movement.
Details the movement's hourly beat rate, temperature compensation, regulation, and suitability for conventional repair.
Provides a numbered list of all components depicted in the movement's exploded view for easy identification.
Explains how to remove the case back and movement cover to gain initial access to the watch movement.
Details the procedure for removing the setting stem and the crystal from the watch movement.
Covers the steps for removing the dial assembly and the sweep second hand.
Explains how to safely remove the energy cell and the shunt bridge from the movement.
Provides procedures for observing the interaction between the balance coil, contact spring, and contact pin.
Offers guidance on the careful handling and positioning of the contact spring and contact pin.
Details the process of removing the balance bridge assembly and the train wheel bridge.
Explains the action of the gear train, impulse pin, and how to handle friction springs.
Illustrates and explains the purely mechanical operation of the balance stop mechanism linked to the crown stem.
Explains the placement and function of the friction washer between the plate and the seconds wheel.
Details the recommended method for cleaning the movement, including balance care and particle removal.
Provides instructions for re-lubricating the movement, listing key points and specific oil/grease recommendations.
Outlines the correct sequence for reassembling the movement's train components.
Explains how to adjust the balance endshake using the balance bridge screw.
Details how to inspect the hairspring for proper contact with the regulator slot.
Provides guidance on pre-positioning hands and securing the dial assembly during reassembly.
Describes the evolution of reflector rings (Flat, Serrated, Cup) and their compatibility with dial types.
The Timex Model 40 is an electric watch movement, measuring 9¾ x 12¾ ligne (22.1 by 28.70 mm, or .870 by 1.130 in.). Its primary function is to provide accurate timekeeping, driven by a miniature energy cell. This energy cell powers the balance, which in turn drives the time train to rotate the hands. The movement has an hourly beat of 21,600.
The watch movement operates on an electric principle, where the energy cell supplies power to the balance. The balance's oscillation is regulated by a contact spring and contact pin mechanism. When the contact spring touches the contact pin on the balance, current flows through the balance drive coil, inducing a magnetic field that opposes the field of the magnet, imparting an impulse to the balance. This precise interaction ensures the continuous rotation of the balance. The contact jewel limits the physical contact between the pin and spring, ensuring electrical energy flow at a specific point in the balance's rotation.
The gear train's action involves an impulse pin on the balance engaging with a fork on the lever, moving it counterclockwise. A pin on the lever then engages with the index wheel, advancing it approximately ¾ of a tooth. Magnets (A, B, and C) attract the tips of the index wheel teeth, moving the wheel forward the remaining ¼ tooth. Magnet C also attracts the draw lever on the index lever, holding it in place. If the index wheel is not correctly positioned by the magnets, a pin on the lever corrects its position for the next engagement.
The hands are set by pulling out and rotating the crown. A notable feature of the Model 40 is a device that stops the movement when the crown is in the set position. This interrupts the current flow from the energy cell, preventing discharge while setting the time. The stem retention is simplified by combining the stem and setting pinion with a novel stem bracket (495/3). The stem's only function is to stop the movement and set the hands.
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General