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ELECTRIC TUNING SYSTEMS
Simplified explanation oF how the Wells-Gardner mechanism works
• CONTINUING the detailed descriptions of electric tuning systems, Radio Today this month in the fourth of a series explains the mechanism used by Wells-Gardner. Besides being found in Wells-Gardner and Arcadia sets, this mechanism is used in a number of sets manufactured by Wells-Gardner for other distributors and sold under their exclusive trade names.
The W-G electric tuner is of the mechanical tyise in that but a single switch is used to control the operation of the motor — station selection being handled by mechanical arrangements instead of electrical contacts.
Set up from front
The accompanying pictures of the tuner show both front and rear views and the various parts are labeled. At the top the 8 selector units and setting discs are visible. Below them in about the center of the front view the 8 shafts for the push buttons are located. Just above each push button is a smaller button which is employed when setting up the mechanism. Setup is accomplished from the front of the set.
The locking plate is shown at the front. Its purpose is to hold the tuning button (8 for 8 stations) after it has been depressed and releasing any other buttons previously depressed. Also it shifts the electricmanual lever, when the setting button is depressed, to engage the clutch. It does this by moving the interlocking lever which, in turn, shifts the clutch release lever. The third func
Figs. 1, 2, 3, showing howj station selecting mechanism works.
tion of the locking plate is to release any depressed buttons when the electric-manual lever is turned to manual— the buttons are locked so they cannot be depressed during manual tuning.
The silencer spring assembly also on the front is operated by the thrust on the motor shaft and silences the set while selecting a station.
The motor and train of gears are located on the rear of the tuning unit. The gears are used to reduce the speed of the motor. The motor drives gear No. 1. Gear No. 5 drives the tuning condenser gang.
At the lower part of the view the clutch plate and drive belt are shown — these come into operation for manual tuning. The belt connects the manual knob through the clutch to gear No. 2. This power is then trans
mitted through the gear train to the condenser shaft.
The main drive cable is securely fastened to a pulley on gear No. 4 and drives the setting discs in the top portion of the mechanism. Various idler pullers are used to keep it tight and in position. Since the positions of the setting discs determine the position of the condensers for various stations, this drive cable is kept tight and without backlash. A tumbuckle is provided to permit adjusting the tension.
Reversing of the motor at either extremity of the condenser is accomplished by a pin on gear No. 4, which operates the reversing switch lever.
The motor is controlled by an onoflf switch operated by the switch lever shown just below the setting discs on the rear view.
Rear (left) and front (right) views of the Wells-Gardner push-button mechanism. Functions of various parts described on these pages. The gear train and drive belts are located at rear. Locking plate and buttons on front.
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Radio Today