JPH043584B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a tape reader drive mechanism of a magnetic recording/reproducing device.

[Background of the invention]

A tape reader drive mechanism of a magnetic recording/reproducing apparatus is used as a drive mechanism for a tape reader that pulls out a magnetic tape in a tape cassette to the outside and winds it around a rotating cylinder, and various configurations have been proposed in the past.

FIG. 4 shows an example. A pair of grooves 8 are formed in the upper chassis 1 at a predetermined distance from the lower chassis 2 on both sides of the rotary cylinder 7. A V-block 9 is fixed to the upper end of this groove 8, and this V-block 9 determines the final position and state of the tape leader 3 moving along the groove 8. Slant pole 4 for tape leader 3
and a vertical pole 5, by which the magnetic tape of a tape cassette (not shown) is pulled out, and when the tape leader 3 abuts against the V-block 9, the magnetic tape is wound around the rotating cylinder 7.

Next, the drive mechanism of this tape reader 3 will be explained. The lower pin 6 of the tape leader 3 is connected to the free end of a mainspring spring 22 which is wound up in the illustrated position and one end of the wire 12. The other end of the wire 12 is fixed to a winding body 13 that is integrated with a worm wheel 15, and this worm wheel 15 is connected to a worm gear 1.
6 and a belt 20 to be rotated by a motor 17. By the rotation of the worm wheel 15, the wire 12 is wound around the winding body 13, the tape leader 3 is driven to the V block 9, and the magnetic tape is wound around the rotating cylinder 7.
At this time, the mainspring spring 22 is in an expanded and biased state.

When the magnetic tape is to be returned to its original position, the motor 17 is rotated in the reverse direction, and the mainspring spring 22 returns the tape reader 3 to the illustrated state.

As typified by this example, conventional tape reader drive mechanisms often use the wire 12 as a means for transmitting the driving force of the tape leader 3. This wire 12 can only be stretched linearly in the portion corresponding to the groove 8 even if a roller 10 that changes direction is used. For this reason, when the tape leader 3 is driven along the side wall of the groove 8, the direction of the wire 12 and the direction of the side wall of the groove 8 do not completely match.
This causes a loss in the driving force of the tape leader 3 transmitted through the tape leader 3. Since the drive mechanism must be designed to drive the tape reader 3 to a predetermined position even with this loss, the drive mechanism ends up becoming large. This tendency becomes more pronounced as the shape of the groove 8 becomes more complicated. In other words, when using a predetermined drive mechanism, the shape of the groove 8 is limited.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object thereof is to provide a tape reader drive mechanism that can drive a tape reader with a relatively small force.

[Summary of the invention]

The present invention fixes a series of guides to a chassis with gaps along the movement trajectory of the tape leader,
A driving force transmitting means made of a flexible plate-like body for transmitting the driving force to the tape reader is disposed within this guide gap, and in this way, the operating locus of the tape reader and the driving force transmitting means is approximately adjusted. It is characterized by being parallel.

[Embodiments of the invention]

The present invention will be explained below with reference to embodiments shown in the drawings.

Since the basic configuration of the drive mechanism is the same as the conventional configuration described above, the same components are given the same reference numerals, and differences will be explained in detail.

FIG. 1 is a plan view, and tape leaders 3 are disposed in a pair of grooves 8 formed in the chassis 1 on both sides of the rotary cylinder 7, respectively. The operation of the tape leader 3 is determined by the shape of the groove 8, and a pair of guides 31a and 31b with a gap 30 parallel to the groove are fixed to the chassis 2 on the opposite side of the groove 8 to the rotating cylinder. has been done. These guides 31a, 31b are, for example, 1
They are a pair of parallel upright flat plates, and a predetermined gap 30 is formed at their opposing parts. Within this gap 30 is a driving force transmitting means 32 made of a flexible plate-like body.
One end of the driving force transmitting means 32 is connected to the tape leader 3, and the other end is connected to the winding body 13.

This configuration will be further explained using enlarged views of FIGS. 2 and 3.

The tape leader 3 has a lower part of a vertical pole 5 and a lower pin 6 fitted in a groove 8, and moves while sliding between the two and the side wall of the groove 8. Lower pin 6
A holder 35 is rotatably connected to the free end of the joint plate 34 rotatably connected to the reader body 33 by a pin 36, and in detail, a driving force transmitting means is attached to this holder 35. 32
One end of is connected. Driving force transmission means 32
is a plate-shaped body made of steel, for example, and is configured to be deformable along the gap 30, also deformable along the roller 10 and the winding body 13, and to return elastically. . This transmission means 32 is housed within the gap 30 and is exposed outside the gap 30 for connection with the holder 35. These two connecting portions move along the gap 30. In the vicinity of the roller 10, the inner guide 31b is omitted, and then there is a pair of guides 31a and 31b again, and in the vicinity of the winding body 13, the inner guide 31b is omitted again. Since the range of movement of the tape leader 3 is up to the vicinity of the roller 10, it is only necessary that the connecting portion between the transmission means 32 and the holder 35 can move in this area.
In this part, the gap 30 is open to the outside, and in other parts, the gap 30 does not need to be open to the outside, as in the case of a pipe, as long as there is no problem in inserting the transmission means 32.

A similar guide is configured for the tape leader 3 on the right side of the rotary cylinder 7, but the first
Illustration is omitted in the figure.

In order to move the tape leader 3 from the lower position A to the upper position B in FIG.
Do this while winding up 2. At this time, the groove 8 that determines the movement trajectory of the tape leader 3 and the transmission means 32
Since it is parallel to the gap 30 that regulates the position of
The joint plate 34 and the reader body 33 always move while maintaining substantially the same relationship. For this reason,
The force required to drive the tape reader 3 is always approximately constant, and the drive mechanism can be configured accordingly. The drive mechanism of this embodiment as described above is different from the conventional drive mechanism designed with consideration to the maximum load so as to generate the necessary driving force even when the loss is greatest in the direction component. can be made small.

Next, the case of driving the tape reader 3 from position B to position A in FIG. 2 will be described.

When the motor 17 is rotated in the opposite direction,
The transmission means 32 moves within the gap 30 and drives the tape leader 3 to position A. Thereafter, when the motor 17 overstrokes, the transmission means 32
As shown in the figure, the holding force of the tape leader 3 becomes somewhat flexed.

As can be seen from this explanation, by selecting the width and material of the gap 30 so that the driving force of the motor 17 can be transmitted to the tape reader 3 as the transmission means 32, the mainspring spring for returning the tape reader, which was conventionally required, can be eliminated. Can be omitted.

In the above embodiment, the guides 31a and 31b are constructed by standing up a pair of plate-shaped bodies facing each other, and in this way, the gap 30 is formed and the connecting portion between the leader body 33 and the transmission means 32 is formed. Although a series of gaps allowing the movement of the guides 31a and 31b are simultaneously obtained, the shapes of the guides 31a and 31b may be changed to form the above-mentioned gaps separately. Also tape reader 3
Although the movement of the tape leader 3 is guided along the shape of the groove 8, various structures other than the groove, such as moving the tape leader 3 along a rail, may be adopted as a guide means for the tape leader 3. I can do it.

〔Effect of the invention〕

As explained above, the present invention provides a guide having a gap formed almost parallel to the guide means of a tape leader, and uses a driving force transmitting means consisting of a flexible plate-like body disposed in the gap to transfer the tape to the tape leader. Since the driving force of the reader is transmitted, the loss of the driving force transmitted from the motor to the tape reader can be kept almost constant and small, and the drive mechanism can therefore be made smaller than before. .

[Brief explanation of drawings]

Fig. 1 is a plan view of a tape reader drive mechanism according to an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a side view of Fig. 2, and Fig. 4 is a conventional tape reader drive mechanism. FIG. 3 is a plan view of the reader drive mechanism. 1, 2...Character, 3...Tape reader,
7...Rotating cylinder, 8...Groove, 10...Roller, 17...Motor, 30...Gap, 31
a, 31b...Guide, 32...Driving force transmission means.

Claims (1)

[Claims] 1. In a tape reader drive mechanism of a magnetic recording and reproducing device that drives a tape reader along a tape leader guide means and thereby winds a magnetic tape around a rotating cylinder, in the vicinity of the tape leader guide means, A guide having a space substantially parallel to this is provided, and a driving force transmitting means consisting of a flexible plate-like body connected to a drive source at one end is disposed within the space, and the driving force transmitting means and the above A tape reader drive mechanism for a magnetic recording and reproducing device, characterized in that a connecting portion connecting tape readers is configured to be movable along the gap between the guides.