JPH054126Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tape recorder with good assembly workability.

(Prior art and its problems) In a conventional tape recorder, a fitting hole formed in a head mounting plate is fitted into a protrusion protruding from the chassis, and an E is inserted into the protrusion extending from the fitting hole. By fitting a locking ring such as a ring, the head mounting plate is attached to the chassis so as to be able to reciprocate.

In this way, with conventional tape recorders,
Attaching the head attachment plate to the chassis requires a locking ring such as an E-ring, which increases the number of parts and makes it difficult to attach the head attachment plate to the chassis.

The present invention was devised in view of the above circumstances, and it is an object of the present invention to provide a tape recorder that does not require a locking ring and has good workability in attaching the head mounting plate to the chassis (assembly workability). .

(Means for Solving the Problems) In order to solve the above-mentioned problems, the tape recorder of the present invention is designed such that the head mounting plate can be attached to and removed from the chassis only at a specific position outside the predetermined reciprocating range. Once the head mounting plate is mounted on the chassis by engaging the plate spring provided on the head mounting plate with the engagement hole provided on the chassis, the plate spring is elastically deformed to release the engagement. , even if the head mounting plate is movable back and forth,
The range of reciprocating movement of the head mounting plate is restricted by a locking piece provided on the plate spring, thereby preventing the head mounting plate from coming off the chassis.

(Function) After setting the head mounting plate on the underside of the chassis at a specific position outside the predetermined reciprocating range with the flat spring sandwiched between the head mounting plate and the chassis, remove the head mounting plate. When the head is slid in one direction and positioned within the predetermined reciprocating range, the engagement portion of the plate spring engages with the engagement hole in the chassis, and the head mounting plate is easily attached to the chassis with a one-touch operation. be done. This improves assembly workability.

In addition, once the head mounting plate is attached to the chassis in this way, even if the plate spring is elastically deformed and the head mounting plate is movable, the locking piece provided on the plate spring remains attached to the chassis. Since the movement range of the head mounting plate is restricted by coming into contact with the edge of the provided engagement hole, the head mounting plate will not come loose from the chassis.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings. FIG. 1 is a plan view of the tape recorder according to the present invention in a stopped state showing the mechanical parts taken out, FIG. 2 is a bottom view of the tape recorder, and FIG. 3 is a view taken along the line in FIG. 1. In each figure, 1 is a chassis, and the chassis 1 includes:
A capstan shaft 2, a reel shaft 3, a motor 4 that rotationally drives the capstan shaft 2 and the reel shaft 3, and a switch 5 that cuts off power to the motor 4.
are provided for each.

The capstan shaft 2 is rotatably fitted into a boss portion 6 provided at a predetermined position of the chassis 1 from the bottom side of the chassis 1 as shown in FIGS. 1 and 9. It protrudes from the top side. Then, by engaging a locking ring 7 such as an E-ring into an annular groove 2a carved on the outer peripheral surface of the capstan shaft 2 at a predetermined location, the locking ring 7 is attached to the upper end surface of the boss portion 6. Lock it against the
The capstan shaft 2 is designed to prevent it from accidentally coming off.

The motor 4 is connected to a power source (not shown) via the switch 5. The rotational power of the motor 4 is transmitted to the capstan shaft 2 via a power transmission mechanism 8. The power transmission mechanism 8 includes:
As shown in FIG. 2, a first pulley 8a with a small diameter is fixed to the rotating shaft 4a of the motor 4, a second pulley 8b with a large diameter is fixed to the lower end of the capstan shaft 2, and these first and Second pulley 8a and 8
An endless belt 8c made of rubber or the like is wrapped between the belt 8c and the belt 8c.

A head mounting plate 9 is mounted on the lower surface of the chassis 1 so as to be movable within a predetermined range. As shown in FIG. 4, the head mounting plate 9 has a generally triangular shape in plan, with one end wide and the other end narrow. Sliding contact part 9 in a planar arc shape facing upward at right angles to the corner part
c.

A magnetic head (for reproduction) 10 and a pinch roller 11 are respectively attached to the upper surface of one end of the head mounting plate 9. The magnetic head 10
The front surface of the tape cassette 12 comes into contact with and separates from the tape (not shown). The pinch roller 11 approaches and separates from the capstan shaft 2 via the tape of the tape cassette 12.

On one end side of the main plate 9a of the head mounting plate 9,
An engagement hole 13 consisting of a long hole having a substantially T-shaped plane is bored, and a plate spring 14 having a substantially inverted F-shaped side surface is provided on the upper surface of the other end. The base end 14a of the plate spring 14 is fixed to the main plate 9a with a screw 15, and the tip end (engaging part) 14b is gradually inclined upward. A locking piece 14c is formed on one side edge of the plate spring 14 on the side of the tip 14b by bending the locking piece 14c upward at a right angle. Slit-shaped engagement holes 16 and 17 are provided at both ends of the side wall portion 9b of the head mounting plate 9 (see FIGS. 3 and 5).

The head mounting plate 9 is attached to the bottom surface of the chassis 1 in the following manner. First, the wide portion 18a at the tip of the approximately T-shaped engagement protrusion 18 protruding from the lower surface of the chassis 1 is inserted into the engagement hole 18 of the main plate 9a.
After slidably fitting into the wide part 13a at the tip of the
Guide pieces 19 and 20 protruding from the chassis 1 are slidably fitted into the engagement holes 16 and 17 of the side wall portion 9b. In this state, move the head mounting plate 9 to the second position.
In the figure, by moving the engaging protrusion 18 of the chassis 1 to the left (position direction in the operating mode),
The narrow portion 18b of the main plate 9a engages with the narrow portion 13b of the engagement hole 13 of the main plate 9a, and the plate spring 14
The tip portion 14b and the locking piece 14c engage with the engagement hole 21, which has a planar substantially L-shape formed in the chassis 1, by their own elasticity, and are in the state shown in FIGS. 5 and 6. Become.

The state shown in FIG. 5 is the stop position of the head mounting plate 9, and in this state, the locking piece 14c of the plate spring 14 is attached to one side edge of the engagement hole 21 of the chassis 1 as shown in FIG. By abutting and locking the (edge) 21d, the head mounting plate 9 shown in FIG.
It is prevented from coming off in the right direction.

The disengagement of the head mounting plate 9 in the operating mode position direction by the tip end 14b of the plate spring 14 is performed when the cassette holder 22 is set to the playback mode.

That is, a cassette holder 22 is rotatably supported on both side walls 1a and 1b of the chassis 1, as shown in FIG. It rotates from the position shown to the playback mode position shown in FIG. When the cassette holder 22 rotates downward, the pressing protrusion 23 protruding from the lower surface of the cassette holder 22 presses the plate-shaped cassette through the engagement hole 21 of the chassis 1, as shown in FIG. By pressing the tip 14b side of the spring 14 downward against the spring force, the tip 14b and the chassis 1
The abutting engagement of the engagement hole 21 with the boundary step portion 21c is released.

As a result, the head mounting plate 9 is pulled forward by the coil spring 24 stretched between it and the chassis 1, and moves toward the reproduction mode position shown in FIG. In the regeneration mode position, the locking piece 14c provided on the plate spring 14 comes into contact with the edge of the wide part 21b of the engagement hole 21, as shown in FIG. 8, and further movement is prevented. . In other words, the limit of movement in the forward direction is between the locking piece 14c and the wide portion 21b.
It is regulated by contact with the edge of.

In this state, since the tip end 14b of the plate spring 14 is located between the chassis 1 and the head mounting plate 9, the head mounting plate 9 is moved by the spring force of the plate spring 14. It is urged in the direction away from the chassis 1, thereby restricting the wobbling (play) of the head mounting plate 9.

A spherical sliding surface 14d that bulges upward is provided at approximately the center of the upper surface of the tip end 14b side of the plate spring 14, and the sliding surface 14d slides on the lower surface of the chassis 1. It is designed to slide into contact freely.

Next, the mounting structure of the head mounting plate 9 to the chassis 1, which is the gist of the present invention, will be explained.

The head mounting plate 9 is out of the range of reciprocating motion between the position where the tip end 14b of the plate spring 14 engages in the engagement hole 21 of the chassis 1 and the playback mode position formed by moving in the direction of the operating mode position. At a specific location,
As described above, the approximately T-shaped engagement protrusion 18 is engaged with the engagement hole 13, and the guide pieces 19, 20 are fitted into the engagement holes 16, 17, thereby being attached to the chassis 1. Then, the head mounting plate 9 moves in the direction of the operating position under the urging force of the coil spring 24, and the head mounting plate 9 engages the tip end 14b of the plate spring 14 into the engagement hole 21 of the chassis 1. It is locked in that position. This state is the state in which the head mounting plate 9 has been completely attached.

The head mounting plate 9 mounted on the chassis 1 in this manner is attached to the cassette holder 22 as described above.
When the engagement between the tip 14b of the plate spring 14 and the engagement hole 21 of the chassis 1 is released due to rotation to the regeneration mode position, the coil spring 24 biases the chassis 1 to return to the regeneration mode position. Moving. Movement of the head mounting plate 9 beyond the playback mode position is prevented by engagement between the locking piece 14c of the plate spring 14 and the edge of the wide portion 21b of the engagement hole 21. This state is the playback mode state.

On the other hand, when an eject operation is performed in this state, the cassette holder 22 is rotationally displaced to the eject position by this operating force, and at the same time, the head mounting plate 9 is moved back against the coil spring 24. When the spring is moved back to a predetermined return position (stopping position), the tip 14b of the plate spring 14 fits into the engagement hole 21 of the chassis 1, and the locking piece 14c is inserted into the engagement hole 21. 21 to prevent further backward movement of the head mounting plate 9. In this state, the tip end 14b of the plate spring 14 engages with the edge of the engagement hole 21 of the chassis 1, and movement in the forward direction is also restricted.

In this way, the locking of the head mounting plate 9 is released as the cassette holder 22 is rotated to the playback mode position, and the head mounting plate 9 is moved back from the playback mode position as the eject operation is performed. moves back and forth between the stop position and the playback mode position. The reciprocating range of the head mounting plate 9 is restricted to only between the stop position and the reproduction mode position by the aforementioned locking piece 14c.

When the head mounting plate 9 mounted as described above is removed from the chassis 1, the plate spring 14 of the head mounting plate 9 in the stopped state as shown in FIG.
The plate spring 14 is forced to elastically deform downward by pressing the tip of the coil spring 24, with the locking piece 14c disengaged from the edge of the engagement hole 21. Push the head mounting plate 9 against the chassis 1.
Slide it to the right in FIG. In other words, the head mounting plate 9 is moved to the aforementioned specific position outside the predetermined reciprocating range of the head mounting plate 9.

Then, the engagement holes 16 and 17 of the head mounting plate 9 come off from the guide pieces 19 and 20 of the chassis 1, and
In addition, the engaging protrusion 18 of the chassis 1 is connected to the head mounting plate 9.
The head mounting plate 9 can be removed from the chassis 1 by coming out of the engagement hole 13 of the head mounting plate 9.

(Effects of the invention) As described above, according to the tape recorder of the invention,
After setting the head mounting plate 9 on the lower side of the chassis 1 at a specific position outside the predetermined reciprocating range with the flat spring 14 sandwiched between the head mounting plate 9 and the chassis 1, the head mounting plate 9 is slid in one direction and positioned within the predetermined reciprocating range, the engagement portion 14 of the plate spring 14
b engages with the engagement hole 21 of the chassis 1, and the head mounting plate 9 can be easily attached to the chassis 1 with a one-touch operation, which improves assembly workability and eliminates the need for a conventional engagement ring. Since it can be installed without any problems, the number of parts can be reduced accordingly.
In addition, although it can be easily installed in this way, once it is installed, the locking piece 14c of the plate spring 14
comes into contact with the edge 21a of the locking hole 21 of the chassis 1, and the reciprocating range of the head mounting plate 9 is restricted, so that the mounted state of the head mounting plate 9 on the chassis 1 is reliably maintained. Further, the head mounting plate 9 can be easily removed from the chassis 1 by forcibly releasing the engagement state of the plate spring 14 with the engagement hole 21.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view of the tape recorder according to the present invention in a stopped state showing the mechanical parts taken out; FIG. 2 is a bottom view of the tape recorder; and FIG. Fig. 4 is a perspective view of the head mounting plate, Fig. 5 is a cross-sectional view showing the mounting structure of the head mounting plate to the chassis in the middle of installation, and Fig. 6 shows engagement with the plate spring in Fig. 5. Perspective view of the hole,
Fig. 7 is a cross-sectional view of the mounting structure of the head mounting plate on the chassis in a completed state, Fig. 8 is a perspective view of the plate spring and engagement hole portion in Fig. 7, and Fig. 9 is a sectional view of the head mounting plate on the chassis. FIG. 2 is a partially cutaway perspective view of the attached state. 1... Chassis, 9... Head mounting plate, 12...
...Tape cassette, 14...Plate spring, 14b...
... Tip part (engaging part), 14c... Locking piece, 21...
...Engagement hole, 21d... One side edge (edge), 22...
Cassette holder, 24...Coil spring (spring).

Claims (1)

[Scope of utility model registration request] A chassis 1, an engagement hole 21 provided in the chassis 1, and a chassis 1 that is reciprocatably attached to the chassis 1 and can be attached to and detached from the chassis 1 only at a specific position outside a predetermined reciprocating range. A head mounting plate 9, a spring 24 that biases the head mounting plate 9 in the forward direction, and the head mounting plate 9.
a plate-shaped spring 14 provided with an engaging portion 14b that is provided in the head mounting plate 9 and that engages the engagement hole 21 to prevent the head mounting plate 9 from moving forward when the head mounting plate 9 is in the backward movement position; , holds the tape cassette 12 in a removable manner, and elastically deforms the plate spring 14 when the playback mode is set.
a cassette holder 22 that releases the engagement between the engaging portion 14b and the engaging hole 21; A tape recorder comprising a locking piece 14c that comes into contact with the edge 21d of the engagement hole 21 to restrict the reciprocating range of the head mounting plate 9.