JPH01116929U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts of an embodiment of the tape recorder of the present invention, and FIG. 2 omits the chassis, movable board, etc. for explaining the swinging of the swinging arm in FIG. 1. FIG. 3 is an assembled cross-sectional view taken along the line A-A in FIG. 2, and FIG. FIG. 5 is a mechanism diagram for detecting the position of the swing arm in the swing path, FIG. 6 is a plan view of the cam groove, and FIG. , is a sectional view taken along line B-B in FIG. 6, FIG. 8 is a diagram illustrating the swinging position of the reel table rotational speed switching lever at the playback operation position of the moving board, and FIG. FIG. 10 is a diagram illustrating the swinging position of the reel table rotational speed switching lever at the fast-forwarding operation position of the substrate; FIG. The figure is a diagram illustrating the rewinding operation position of the moving board by driving the drive motor in reverse rotation, and FIG. FIG. 13 is a diagram illustrating a fast-forward operating position, and FIG. 13 is a diagram illustrating a non-operating position of the movable board by stopping the drive motor during the swinging of the swinging arm. 1: Chassis, 7: Drive gear, 71: Large diameter gear section, 72: Small diameter gear section, 8, 8': Reel stand, 9
1: Regeneration connection gear, 92: Fast forward connection gear, 10
: Drive motor, 12: Swinging member, 16: Engagement protrusion, 17: Moving board, 18: Reproducing magnetic head, 19
: Pinch roller, 20: Capstan, 21:
Coil spring, 22: Cam hole, 27: Reproduction/
Rapid feed switching arm, 28: engaging pin, 29: cam groove, 30: step, 31: reel stand rotation speed switching lever, 34: erasing arm, 35: erasing magnetic head, 36: spring.

Claims (1)

[Claims for Utility Model Registration] (1) A swinging member that swings and biases according to the direction of rotation of a drive motor is disposed on a chassis, and a pinch roller and a reproducing magnetic head are disposed on this chassis. A movable base plate is arranged so as to be reciprocally movable so that the pinch roller can come into contact with and separate from the capstan, and the movable base plate is elastically biased by an elastic member in a direction in which the pinch roller abuts on the capstan. Protruding engagement protrusions are provided on the moving member,
This engaging protrusion is inserted into a cam hole formed in the movable board, and the position of the engaging protrusion in the reciprocating direction of the movable board and the cam at two positions where the swinging member is pivoted and biased. The position of the movable substrate in the reciprocating direction of the movable substrate is controlled by the position of the edge of the hole that comes into elastic contact with the engagement protrusion, and the movable substrate is elastically biased by the forward rotation of the drive motor. The pinch roller is moved forward to the maximum in the regeneration operation position in the direction in which the pinch roller is brought into elastic contact with the capstan, and the movable substrate is moved back in the elastic biasing direction to the regeneration operation position by reverse rotation driving of the drive motor, and the pinch roller is moved forward in the regeneration operation position. is set to a rewinding operation position where it is separated from the capstan, and a playback/fast-forward switching arm having an engagement pin protruding from its free end is swingably disposed on the movable board, and the chassis is moved in the elastic biasing direction. An annular cam groove having different forward and return paths is bored, the engagement pin is inserted into this cam groove, and the engagement pin is allowed to move only in the backward direction during the return path of the cam groove. A backward movement prevention part is provided, and the movable board in the reproduction operation position is moved backward in the elastic biasing direction by the reverse rotation drive of the drive motor until the engagement pin passes through the reverse movement prevention part, and this backward movement prevention part is fast-forwarding to separate the pinch roller from the capstan by causing the drive motor to rotate in the forward direction to prevent the engagement pin from advancing at the reverse movement prevention portion so as to set the movable board to a position retreated from the playback operation position; A tape recorder characterized in that it is configured to be in an operating position. (2) Utility model registration claim 1, characterized in that the engagement pin is inserted so as to make elastic contact with the bottom of the cam groove, and a step is provided at the bottom of the cam groove to serve as the reverse movement prevention portion. Tape recorder as described in section. (3) A drive gear that is drive-coupled to the drive motor and rotates the reel stand on the take-up side is formed by a small-diameter gear section and a large-diameter gear section, and the drive gear is rotationally driven by the forward rotation drive of the drive motor. A large-diameter playback connection gear and a small-diameter fast-forward connection gear are arranged on the reel stand, and a reel stand rotation speed switching lever is provided that swings depending on the difference between the playback operation position and the fast-forward operation position of the movable board, The tape recorder according to claim 1 or 2, characterized in that the gear ratio between the drive gear and the reel base is changed by swinging the reel base rotation speed switching lever. (4) A request for registration of a utility model, characterized in that the reel stand rotation speed switching lever moves the reel stand on which the regeneration connecting gear and the fast-forwarding connecting gear are disposed in the axial direction to change the gear ratio. The tape recorder according to item 3. (5) An erasing arm provided with an erasing magnetic head is swingably disposed on the chassis, and the erasing arm is elastically biased by an elastic member in a direction in which the erasing magnetic head contacts the magnetic tape. The swinging of the erasing arm in the elastic biasing direction is regulated by the movable board, the erasing magnetic head is brought into strong contact with the magnetic tape at the playback operation position of the movable board, and the erasing magnetic head is brought into strong contact with the magnetic tape at the fast forward operation position of the movable board. 5. A tape recorder according to any one of claims 1 to 4, characterized in that the erasing magnetic head is configured to come into light contact with the magnetic tape.