摘要:
In a record player, the movement of the tone arm is controlled by a select plate operated by a lever which moves the plate to a position corresponding to a record size. Adjacent the select plate is a C-shaped lever which cooperates with a rotary member. The rotary member has a plurality of cams which serve to program the operation and various movements of the tone arm. Extending from the peripheral edge of one of said cams is a brush. The tone arm is also responsive to a bracket with a wall, said wall being engaged by the brush. A position detector plate is mounted on the bracket which cooperates with a photo-interrupter to detect the position of the tone arm with respect to a record being played.
摘要:
Apparatus for adjusting and displaying the stylus pressure exerted on a record disc by a stylus carried by a tone arm in a record playing device comprises a vertical drive motor for bi-directionally driving the tone arm in the vertical direction, an adjusting circuit, such as an adjustable resistor, producing a control signal whose level is determinative of the stylus pressure, an energizing circuit responsive to the control signal for energizing the vertical drive motor in accordance with the level of the control signal, thereby establishing the stylus pressure, and a display device, such as a digital display, responding to the control signal for providing a visual display of the stylus pressure as determined by the level of the control signal.
摘要:
A record player tonearm A may be swung about a shaft 3 and raised and lowered by an elevation plate 8 secured to a shaft 8a. The rounded lower end of shaft 8a serves as a follower on a cam 10 rotated about a shaft 9 by a planetary gear 13 mounted on a shaft 10b eccentrically disposed on the cam with respect to the shaft 9. The planetary gear is frictionally engaged with the cam 10 whereby it initially revolves about shaft 9 to thereby rotate the cam and raise or lower the tonearm. After approximately one-half of a revolution the planetary gear comes to frictionally abut against a sector plate 18 secured to the bottom of shaft 3. This terminates the revolution, whereafter the planetary gear rotates about its shaft 10b to drive the sector plate and swing the tonearm.
摘要:
The disclosure is directed to the mechanism for locating on, and reading out from, a flat disc record, by means of a pick-up needle, selected information which is recorded thereon. The overall controls for selecting and retrieving or reading out the desired parts of the recorded information, and for utilizing the information, are not a part of the present invention. The mechanism here disclosed and claimed is adapted to the performance, in sequence, of certain required mechanical operations and means for performing the same, some of which have utility in other fields such, for example, as record playing phonographs and the like.
摘要:
A tone arm, designed for use with a semi- or fully automatic record player, is provided with an electromagnetic drive mechanism. The tone arm is supported by two separate shafts so as to be rotatable in both the horizontal and vertical directions. A bobbin, to which horizontal and vertical drive coils are circumferentially attached, is arranged coaxially with that shaft permitting horizontal movement. A permanent magnet is arranged facing the drive coils. Interaction between the permanent magnetic field and those generated by energization of the drive coils causes either a torque or a vertical force to be imparted to the bobbin and thus effect a corresponding movement of the tone arm.
摘要:
An automatic record player controlling automatically a tone arm to reproduce a record disk which can be of various diameters. The tone arm is moved from an arm rest onto a record to reproduce the record and is returned from the record to the arm rest when the record is reproduced either completely or only halfway. The tone arm of the automatic record player can also be controlled manually.
摘要:
Apparatus for controlling a tone arm is provided with a horizontal drive motor for moving the tone arm in the horizontal direction, a horizontal velocity detector connected to the same rotating shaft as the tone arm so as to move concurrently with both the tone arm and the horizontal drive motor, a control circuit having a motional feedback loop to energize the horizontal drive motor in accordance with a desired pre-set velocity signal and a fedback detected velocity signal.
摘要:
A tone arm assembly provided with a motor for moving a tone arm in a horizontal direction with respect to a record disc, a servo circuit for keeping the moving velocity of the tone arm constant, and a positioning servo circuit to operate when the tone arm reaches a reproducing position, in which the positioning servo circuit and the velocity controlling servo circuit are combined together thereby to stop the tone arm quickly at a predetermined position.