JPH0240584Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape slack removal device for a tape recorder that efficiently removes tape slack when transitioning from stop or pause mode to recording or playback mode.

Generally, in a tape recorder, when transitioning from recording, playback, or high-speed feed mode (operation mode) to stop or pause mode, the inertia of the reel stand,
Alternatively, there is a risk that the magnetic tape may become loose due to an inconvenience in the timing of applying the brake.

Therefore, when the mode is changed from the stop mode in which the tape is loose to the recording or playback mode, the loose portion of the tape will not be able to record or play back with insufficient pressure between the magnetic head and the tape while being wound. As a result, the frequency characteristics deteriorate, and when the slack portion is finished winding, the back tension of the supply reel base is suddenly activated, causing adverse effects such as wow and flutter.

Therefore, as a means to solve this problem,
As in Publication No. 163908, when transitioning from stop mode to playback or recording mode, the supply reel base is slightly rotated in the rewinding direction as the head board moves forward to remove slack before the head comes into pressure contact with the tape. It is developed with a peep mechanism. According to this method, the above-mentioned problems can be solved, but the structure is complicated, the number of parts is large, and the cost increases significantly.In addition, it is also possible to prevent the tape from moving further in the unwinding direction, such as at the end of the tape. However, during recording and reproducing operations, noise is generated due to unnecessary gear engagement, and in extreme cases, the tape may be cut. The present invention has been devised in view of these problems, and provides a slack removing device which has a very simple structure and does not cause the above-mentioned inconvenience even when the tape ends.

An embodiment will be described below with reference to the attached FIGS. 1 to 5. A supply reel stand 1, a take-up reel stand 2, and a head board 3 supporting a head H are arranged on a chassis (not shown). These functions have a well-known structure and will not be explained here, but during recording or playback (hereinafter referred to as recording/playback), the tape is transferred from the supply reel stand 1 to the take-up reel stand 2. shall be. A gear portion 1a is integrally formed on the supply reel stand 1. This gear portion can also serve as a driven gear for rewinding drive, but it is also a driven gear for removing slack, which will be described later. As is well known, the head board 3 is configured to be able to slide up and down in the figure between two positions: a stop or pause position and a playback or recording position. A shaft 3a is erected on the head substrate 3, and a lever 4 is rotatably and slidably supported on the shaft 3a through an elongated hole 4a. A pin 3b is also provided upright on the head board 3, and is inserted into a guide hole 4b of the lever 4. The guide hole 4b is the first
It has a structure in which a convex part c is separated between the concave part a and the second concave part b, but in the stop (hereinafter referred to as stop including temporary stop) mode (Fig. 1), the pin 3b is It is located in the recess a of No. 1.
A spring 5 is hung between one end of the lever 4 and the head board 3, and is always biased to rotate the lever 4 counterclockwise and to slide it up and down. ing. The other end of the lever 4 is also provided with a drive section 4c that engages and disengages the gear section 1a of the supply reel stand, but in the stopped state (Fig. 1) and after transitioning to the recording/playback mode, the gear section 4c 1a, and is located in a position that does not interfere with the rotation of the supply reel stand. 4d is a first cam surface provided at an angle at the other end of the lever 4 so as to be engaged with and disengaged from a pin regulating member 6 erected on a chassis (not shown), and 4e is a first cam surface that similarly contacts the pin Part 7
This is the second cam surface that engages and disengages. c' represents the position of the cassette.

The present invention has the above configuration, and its operation will be explained below with reference to the drawings.

When a playback or recording operation or a pause canceling operation is performed using an operation means (not shown) from the stop mode shown in FIG. 1, the head board 3 slides upward in the drawing. Then, at the same time as the head board 3 slides, the lever 4 supported by it also slides. The lever 4 slides until its first cam surface 4d comes into contact with the pin 6. During this time, the drive section 4c meshes with the gear section 1a of the supply reel stand 1, causing the reel stand 1 to rewind the tape. Rotate slightly in the direction. As a result, the loose tape is wound onto the supply reel.
When the first cam surface 4d comes into contact with the pin 6, the lever 4
Since it is no longer possible to slide upward any further, only the head substrate 3 slides further while stretching the spring 5, and assumes the position shown in FIG. At this time, pin 3b on the head board is connected to lever 4.
Because it comes off from the first recess a of the guide hole 4b,
The lever 4 is rotated counterclockwise about the shaft 3a by the tensile force of the spring 5, and the second recess b is engaged with the pin 3b. (Figure 3). As a result, the drive section 4c is disengaged from the gear section 1a and assumes a position where it does not interfere with the rotation of the reel stand. At the same time as the above operations are completed, the transition of the tape drive mechanism (not shown) to the recording/reproducing mode is completed, and the tape whose slack has been removed begins to be driven at a constant speed.

Next, when the recording/reproducing mode is changed to the stop mode or the temporary stop mode, the head board 3 slides downward in the figure. When the head board 3 slides downward, the lever 4 also moves downward.
At this time, since the lever 4 is rotated counterclockwise, the drive section 4c does not mesh with the gear section 1a of the supply reel stand 1. As the lever 4 slides further, its second cam surface 4e
comes into contact with the pin 7 (FIG. 4). Since this cam surface is inclined as shown in the figure, when the head board 3 slides further, the lever 4 is rotated clockwise about the shaft 3a. For this reason, lever 4
connects the second recess b of the guide hole 4b to the pin 3b.
pin 3, and the first recess a crosses the convex part c.
(Fig. 1).

The above is the transition operation from the recording/playback mode to the stop mode. Next, a case will be described with reference to FIG. 5 in which a recording/reproducing operation is performed when the tape cannot be moved any further in the rewinding direction, such as when the tape is stopped at the beginning of the tape due to rewinding.

When the recording/reproducing operation is performed in the same manner as described above, the head board 3 and lever 4 begin to slide upward from the state shown in FIG. The drive part 4c of the lever 4 is also the gear part 1
a, but since the reel stand 1 cannot rotate any further in the rewinding direction, the lever 4 stops sliding. However, since only the head board continues to slide, the pin 3b disengages from the first recess a of the guide hole 4b, and the spring 5 Due to the bias, the lever 4 rotates counterclockwise and assumes a position where the pin 3b engages with the second recess b. As a result, the drive section 4c is disengaged from the gear section 1a, so that the lever 4 and the head board 3 can further slide without any hindrance, allowing a transition to the recording/reproducing mode shown in FIG. 3.

As described above, according to the present invention, tape slack can be efficiently removed when transitioning from stop mode etc. to recording or playback mode, and the inconveniences conventionally caused by tape slack can be eliminated. There is no concern that the tape will become loose when returning from recording or playback mode to stop mode, etc., and is extremely superior in practical terms.It is also structurally simple with few parts, and is installed on the chassis side. The only parts are regulating members such as pins and abutting members.
The main parts including movable parts such as levers can be assembled around the head board, making it easy to assemble and assemble the tape slack remover, making it an excellent idea in terms of workability.

In the above embodiment, the lever driving portion 4c engages with the gear provided on the periphery of the supply reel stand, but the gear is not limited to this, and any gear that can transmit rotational force to the supply reel stand can be used. Alternatively, other members (idler gear, etc.) may be used.

[Brief explanation of the drawing]

The attached drawings show each mode of the tape recorder equipped with the tape slack removal device according to the present invention. Figure 1 shows the stop mode, Figure 2 shows the mode in the middle of transition from the stop mode to the recording/playback mode, and Figure 3 shows the recording/playback mode, Figure 4 shows the mode transitioning from the recording/playback mode to the stop mode, and Figure 5 shows the recording/playback mode from the stop mode when the tape is completely rewound onto the supply reel stand. FIG. 7 is an operation explanatory diagram showing each mode in the middle of transition. 1... Supply reel stand, 3... Head board, 4...
...Lever, 4d...First engagement surface, 4e...Second
engagement surface, 6... pin, 7... pin.

Claims (1)

[Scope of Claim for Utility Model Registration] A supply reel stand provided on a chassis, a head board provided on the chassis so as to be slidable back and forth, and a head board provided on the board so as to be rotatable and in the same direction as the sliding direction of the head board. a lever slidably pivoted relative to the head board; and a lever located between the lever and the head board, the lever being placed in a first rotational position where it can apply a rotational force to the reel stand and a second rotational position where it cannot be applied. a means for selectively locking the lever in the rotating position; When the head board and the lever at the first rotational position both slide forward, the lever applies a rotational force in the rewinding direction to the supply reel base and then comes into contact with the lever, The forward sliding of the lever is restricted by the contact, and the relative displacement between the head board and the lever due to the forward sliding of only the head board releases the locking of the lever at the first rotational position, and the biasing force of the spring means is When the regulating member provided on the chassis, which rotationally displaces the lever to the second rotational position, and the head board and the lever at the second rotational position both slide backward, the backward sliding ends. Immediately before contacting the lever, the lever is prevented from sliding backward by the contact, thereby releasing the lock at the second rotational position of the lever and rotating the lever to the first rotational position. A tape slack removing device for a tape recorder, comprising an abutment member provided on the chassis for returning the tape to its original position.