Abstract: An improved fine adjusting mechanism for a preset type tuner, which is so arranged that, with a ring having cam portions being fitted under pressure onto a fine adjusting shaft of a tuner for simultaneous rotation with it and also for slippage with respect to the fine adjusting shaft against a torque larger than a predetermined extent, a lever having a transmission gear rotatably mounted on it is urged by a spring force so that its actuating projections are held in pressure contact with the cam surface of the ring with the cam portions, so that rotation of the fine adjusting shaft is converted into a pivotal movement of the lever through the ring so as to positively engage the transmission gear with each of gears having threaded portions for an efficient local oscillation frequency adjustment.

Abstract: The present television fine tuning is constructed so that an initial rotation establishes the fine tuning state and that a continued rotation of the fine tuning shaft performs the fine tuning. For this purpose the present tuner comprises a fine tuning driving member, a rotation transmitting idler member, a plate spring for supporting the idler member and a fine tuning adjustment element. The driving member includes a fine tuning shaft, a slide gear and a slip clutch concentrically mounted on the front of the chassis around a channel selector shaft supported by the chassis. The slip clutch has a plastic collar loosely mounted around the selector shaft, and a metallic sheet member located in a gap formed between the inner surface of the plastic collar and the outer surface of the selector shaft.

Abstract: The present television fine tuning is so constructed that an initial rotation establishes the fine tuning state and that a continued rotation of the fine tuning shaft performs the fine tuning. For this purpose the present tuner comprises a fine tuning driving member, a rotation transmitting idler member, a plate spring for supporting the idler member and a fine tuning driven member. The driving member includes a fine tuning shaft, a slide gear and a slip clutch mounted in front of a chassis concentrically around a channel selector shaft supported in the chassis. The spring member has freely slidable end portions disposed between the chassis and the slide gear for biasing the slide gear in the forward direction. The idler member is movably arranged on the spring member for transmitting the fine tuning movement. The slide gear has a gear back of a flange and a driven cam surface in the front of the flange and is operatively mounted around the slip clutch.

Abstract: A turret type television tuner comprises a chassis subassembly including a chassis base, an electrical wiring sub-assembly fixed on the chassis base, and a rotor assembly including a turret secured to a selector shaft within the chassis base. The turret includes an insulating elastic support disc with integrally formed holes and tongues in divided radial sector portions of the perimeter, a rigid support disc with outwardly opened notches, elongated insulating coil units provided with cavities at one end portion thereof and intermediate grooves, and fine tuning screws located within the respective cavity for adjusting the inductance of the respective coil unit. Each tongue of the elastic support retains the respective screw to hold its position within the respective cavity.

Abstract: The present fine tuning device comprises a fine tuning shaft mounted concentrically around a main channel selecting shaft supported in a chassis base. A plate spring member is disposed on the chassis for thrust biasing the fine tuning shaft. A gear member is arranged for transmitting the fine tuning movement from the fine tuning shaft to a fine tuning screw. The fine tuning shaft is provided with a radially extending flange and a peripheral gear, and the transmitting gear member is provided with a first gear engageable with the peripheral gear of the fine tuning shaft and a second gear engageable with the fine tuning screw. The plate spring member supports the rotating transmitting gear member whereby the axial direction of movement may be changed or shifted by deformation of the plate spring member.

Abstract: A combination VHF and UHF tuner is provided in which a common station selector shaft may be rotated a number of revolutions to cover the seventy stations in the UHF band. The common selector shaft is provided with twenty-four detent positions per revolution and in alternate positions of the shaft the twelve VHF stations in the VHF band are received. As the common selector shaft is rotated through several revolutions the VHF stations are repeatedly received but are interspersed with different individual stations in the UHF band. Accordingly, no matter what UHF station is being received, all of the VHF stations are always within one turn of the common selector shaft. In many mixed UHF-VHF reception areas a single turn of the common selector shaft is sufficient to select all of the UHF stations as well as all of the VHF stations which are broadcasting in that area.

Abstract: A portion of the instrument panel which is adjacent to the steering wheel is protruded and in which portion a radio receiving device is fitted which includes station-number and frequency indicator means and control means for station selection and frequency adjustment. The indicator means are arranged in the front face of the protruded panel portion so as to enable the driver readily to take the indicator readings without the need of shifting his line of sight to any substantial extent. The control means are arranged in the protruded panel portion sidewise thereof, including, among others, a single control knob arranged in a position to be readily reached by the driver's hand for controlling operation.

Abstract: A digital channel selecting apparatus for selecting a channel among a plurality of channels which are distributed in at least a relatively higher and lower frequency regions, wherein a plurality of capacitance elements are coupled in parallel, each constituting a portion of a tuning circuit, such that each capacitance element is individually coupled to a corresponding switching device which is operable responsive to a digital control signal, whereby the total capacitance value associated with the tuning circuit is varied to achieve channel selection, characterized in that a fixed reactance component, such as a fixed inductance component or a fixed capacitance component commonly coupled to said plurality of capacitance elements for constituting the tuning circuit is selectively switched to a different reactance value in a semifixed manner by means of a switching diode for each of the higher and lower frequency regions.

Abstract: Disclosed is a preset plate for a VHF tuner, having a first and a second rotary bodies which are unitarily mounted on a main shaft of the VHF tuner. The first rotary plate has a plurality of coils corresponding to respective channels to be selected and a number of switching contact pieces, while the second rotary body carries a plurality of fine-adjusting screws for getting into and out of the cavities of respective coils for varying the inductance thereof. Stationary contact members are fixed on the frame of the tuner for engaging the successive switching contact pieces as the preset plate is rotated around the axis of the main shaft.

Abstract: A tuner for use in a telecommunication receiver having a rotary drum carrying a plurality of oscillation coils and a fine tuning member for each coil supported for movement inside of the coil for fine tuning and having a geared head, and a main shaft on which the rotary drum is rigidly mounted, and a fine tuning mechanism which has a hollow shaft coaxially mounted on the main shaft for movement between projected and retracted positions and having a drive gear mounted thereon and a transmission gear assembly for transmitting the rotational force of the hollow shaft to the geared head of any one of the fine tuning members. The transmission gear assembly is supported by a support plate assembly.

Abstract: A television tuner arrangement is disclosed including a wide band signal selecting circuit having a solid state voltage variable capacitance selectively controllable in accordance with the level of applied voltage and a channel selector control for controlling the voltage levels applied thereto. The control illustrated herein includes a selector, actuatable to a plurality of channel selection settings, a cylindrically shaped structure providing an external surface of conductive material, and a plurality of voltage taps radially disposed about the surface of the cylindrical structural and mounted for individual movement along the conductive material. A tuning voltage bus is connected to the wide band circuit and is selectively connectable to each of the taps. The cylindrically shaped structure and the taps are mounted for rotation about the axis of the structure and ganged to the selector so that a separate tap is connected to the bus for each channel selection setting.

Abstract: The present turret type television tuner comprises a U-shaped chassis having first and second end walls joined by a side wall. A main channel selecting shaft is supported in said end walls. A toothed index wheel is mounted on the selector shaft adjacent the first end wall. A fine tuning shaft is mounted concentrically around the selector shaft. A fine tuning drive includes a first driving gear mounted concentrically on the fine tuning shaft and a second driving gear mounted on a pivotally mounted member on the second end wall. A coupling clutch permits a fine tuning operation. A torsion bar spring member including a bail portion is mounted on the first and second end walls, whereby a first resilient arm of the spring member extends along the first end wall to engage the toothed index wheel, while a second resilient arm portion extends along said second end wall to engage the selector shaft and bias it against its bearing surfaces.

Abstract: This invention relates to a channel selector suitable for use in a television receiver set. The channel selector comprises a channel selecting shaft which is linked to a variable capacitor shaft through an Oldham coupler. A fine tuning shaft also is linked to the variable capacitor shaft through a coupler incorporating an incremental detent arrangement.Selection of a channel is made by turning the channel selection shaft to move the variable capacitor shaft by a suitable angle (for instance, about 2.degree.). When the channel selection shaft is turned by such an amount, the coupler slips so as to allow the variable capacitor shaft to turn independently of the fine tuning means. Once a channel is selected, fine tuning is made by slightly turning (for instance, within 0.3.degree.) the fine tuning shaft to correspondingly rotate the shaft of the variable capacitor.The channel selector also comprises means for memorizing the results of the fine adjustments for individual channels.

Abstract: A frequency selector comprising a first control member for frequency preselection changing and a second control member for changing the preselection frequency. The control members are coupled such that unintended changing of the preselection frequency by touching the second control member is prevented.

Abstract: A plurality of fine tuning elements are mounted on a disc which is rotatable by a selector shaft so that a selected tuning element is in a tuning position. Each tuning element comprises a screw with a gear mounted at the end thereof. A tuning shaft is rotatable and translatable on the selector shaft and has an actuator disc and a tuning gear fixed thereto. An idler shaft has first and second gears fixed thereto and is normally held in a tilted inoperative position by a spring. The tuning shaft is manually translatable so that the actuator disc engages with the idler shaft and tilts the same against the force of the spring in such a manner that the first and second gears engage with the tuning gear and the gear of the selected tuning element respectively to drivably connect the tuning shaft to the screw of the desired tuning element.

Abstract: A turret-type controller includes a base with a plurality of resistive strips mounted thereon, each of which is associated with a conductive contact movable with respect thereto. A pair of annular conductive strips are also situated on the base, but axially spaced from the resistive strips. The annular conductive strips are each operably connected to a different end of the resistive strips by means of a conductive strip, one of which is at least partially situated on the underside of the base. Each of the resistive strips has a length preselected such that the change in the magnitude of the tuning signal required to provide a given frequency change in the tuner in different regions of the frequency spectrum is achieved through substantially equal variations in the conductive contacts associated with each resistive strip.

Abstract: A radio frequency tuner for ultra-high frequency range provided with an improved fine tuning device in which a conductor plate member is movably disposed in the vicinity of a resonant line whose one end is connected to a variable capacity element for tuning and whose other end is connected to earth directly or through a capacitor, so that the characteristic impedance of the distributed constant line is varied by driving the conductor plate member toward or away from the resonant line for fine adjustments of the tuned frequency.

Abstract: A detent type tuning mechanism for a UHF tuner having a continuously variable tuning shaft includes a detented selector shaft, a gear train interconnecting the tuning shaft and the selector shaft, and a memory type fine tuning mechanism including a rotatable turret having mounted thereon a plurality of cams each engageable by a fine tuning shaft when the selector shaft is positioned in predetermined ones of the detent positions. A Geneva mechanism is employed to rotate the turret a predetermined increment to bring a different one of the cams into engagement with the fine tuning shaft when the selector shaft is rotated a predetermined number of detent positions. Each cam thereby serves as a memory fine tuning member for a predetermined group of adjacent UHF channels corresponding to a like number of detent positions of the selector shaft. An indicator dial provides a numerical display of the precise UHF channel selected at each position of the detented selector shaft.

Abstract: A television tuner includes a rotatable turret and a plurality of coil forms positioned in the turret. There is a pair of tuning coils mounted on each coil form and an adjustable tuning screw extending outwardly from each end of each coil form. The housing mounting the rotatable turret includes means for adjusting the tuning screws at opposite ends of each coil form. The turret is detented within its housing such that there are twice as many detented positions of the turret as there are coil forms and such that at each detented position only one tuning screw can be adjusted.

Abstract: A limited tuning range tuning unit useable with a television tuner of the turret type includes a user tunable coil having a tuning slug extending from an end of the tuning unit. A pinion gear engageable by a drive train coupled to a user operated fine tuning shaft is attached to the end of the tuning slug. The pinion gear is provided with a stop tooth for limiting the adjustment range of the slug to approximately one revolution. In one embodiment, the slug is also longitudinally movable with respect to a coil in the coil unit to provide a factory adjustment for centering the tuning range available to the user. Alternatively, the factory adjustment may be provided by making the slug rotatable with respect to the pinion gear.