JPS5814454Y2 - magnetic recording and reproducing device - Google Patents

Description

[Detailed description of the invention] The present invention is a magnetic recording and reproducing device such as a video tape recorder (VTR), and in particular, a magnetic recording device that can automatically vary the reel base span length by determining the size of an inserted tape cassette. This invention relates to improvements in playback devices.

In order to be able to use tape cassettes of different sizes in a magnetic recording/reproducing device, such as a VTR, the reel span length can be automatically varied by determining the size of the cassette. A device was proposed by L. Ru.

However, conventional devices of this type have disadvantages in that the reel stand does not rotate smoothly and the engagement of the cassette with the cassette guide shaft is not very good.

Furthermore, it is difficult for the reel to enter the reel stand when inserting the cassette.
・No was also a problem.

The present invention was devised to improve the drawbacks of such conventional devices, and will be described below with reference to embodiments shown in the drawings.

In the embodiment shown in FIGS. 1 to 3, 1 on the upper side of the drawing
A to 1c are reel stands, and helical gears are formed on the outer peripheral surface of each reel stand.

(However, a part of the reel stand 1c is formed with a spindle gear, which is ℃ U-o) 26a at the bottom of the drawing is a reel stand corresponding to the reel stand 1a, and those corresponding to the reel stands 1b and lc are Since it is symmetrical, illustration is omitted.

Reel levers 2 and 2' are rotatable about the shaft 01, and reel stands 1a and 26a are mounted thereon.

3, 4 and 5 are connected to the reel switching plate 12 by connecting levers.

Reference numeral 6 denotes an S tension operating lever, one end of which is connected to the levers 4 and 5, and one end of an operating rod 7 is connected to the other end.

The other end of the actuating rod γ is connected to one end of the S tension operating lever 8.

A stopper 9 is brought into contact with this lever 8, and one end of a tension spring 10 is connected to the other end of the lever, and the other end of the spring is connected to a rotatable tension regulator. - Engages with one end of the arm 11 via a predetermined member.

The reel levers 2, 2' are spring-loaded to the member 13.

The members 14a, 14b, 15a, 15b are the detection lever 18
A and the S tension actuation lever 6, and are interlocked when a cassette is detected.

A spring 16 applies biasing force to the member 14a.

17 is a tension band, one end of which engages with the reel stand 1c, and the other end of which engages with the tension regulator arm 11.
It is combined with (・ru.

The detection lever 18a is rotatably supported on a fulcrum 18b, and as will be described later, when a cassette is inserted, a member 18c attached to the upper end of the lever 18a moves toward the side of the cassette depending on the size of the cassette. It rotates by coming into contact with the end face.

Reference numeral 21 denotes a cassette up plate, which is normally biased by a spring 25, and one end of which is provided with a projection 21' for a stopper of the lever 18a.

Reference numeral 22 denotes a lock lever for locking the reel lever 2 by engaging the lock pier 22' in conjunction with a loading ring (not shown) of the VTR.

23 is a board, and 24 is a reel hub.

In the mechanism configured as described above, the reel stand 1a placed on the reel lever 2 is rotated from axis 04 to axis 04' in accordance with the size of the inserted cassette. The reel spin length is automatically set to a predetermined reel stand span length, and its operation will be explained next.

It goes without saying that the operation of the reel stand 26a placed on the opposite reel lever 2' is the same as that for the reel stand 1a.

Now, as shown in FIG. 2, when the cassette amplifier board 21 is pushed in by inserting, for example, a large force cent 2'0, the reel switching board 12 moves to the right with respect to the support shaft 13a on the member 13, depending on the position of the cassette detection lever 18a. Move to.

As a result, the levers 4, 5, and 3 connected to the reel switching plate 12 are operated to rotate about their respective axes as shown in FIG. 1, and the reel lever 2 is rotated counterclockwise.

The reel stand 1a moves from axis 04 to position 04'.

At this time, what should be noted is that, as shown in FIG.
・Because of this, no lateral pressure is applied to the cassette.

Further, as shown in FIG. 3, the reel lever 2 is locked in a predetermined position by a lever 22 interlocked with a loading ring (not shown) engaging a lock bin 22'.

In this case, even if the cassette is slightly eccentric with respect to the reel stand position, both reel stands can move about L until the tape is loaded, so that the reel and reel stand will mesh well when the cassette is inserted, but the loading is complete. At the same time, both reel stands are completely positioned.

FIG. 4 shows an example of the locking mechanism of the reel lever 2.

In the same figure, reference numeral 27 indicates a loading ring, 28 indicates a rotatable lever having a rolling wheel 29 at one end that rotates while contacting the outer periphery of the loading ring 27. 30 indicates a lever that connects the lever 31 to the lever 28. , 32 is a lever that connects the lever 31 to one end of a rotatable lock operating lever 33.

A protrusion 34 that can engage with the lock lever 22 is provided at the tip of the lock operating lever 33, and the lock lever 22 is rotatable, with a central protrusion 35 that engages with the lock pin 22'. A recess 38 is formed, and a spring 36 with relatively weak bias is coupled to the end.

When loading of the tape is completed, there is a protrusion 31 on the outer periphery of the loading ring 21 at a position immediately before the loading is completed, and the rolling wheel 29 is placed on the protrusion 37, so that the lock operating lever 33 is moved in the direction of the arrow. rotated to
The protrusion 34 engages with the lock lever 22 to rotate it.

Therefore, the recess 38 of the lever 22 fits into the lock pin 2' to lock the reel lever 2.

The reel lever 2 may be configured to be locked by a mechanism linked to the cassette amplifier mechanism immediately after the cassette is completely seated on the guide shaft.

Next, the automatic adjustment function of the tape bank tension in the embodiment described above will be explained.

VrR allows you to use large and small cassettes such as those mentioned above.
- Especially when the tape runs in FWD, it is necessary to ensure that both supply reel side puncture tensions can maintain appropriate values.

Needless to say, this tension has a serious effect on the stability of head contact, tape running, etc.

Therefore, it is desirable that this tape bank tension be constant regardless of the size of the reel diameter.

Therefore, in the present invention, in consideration of such reasons, (a) the wrapping angle of large and small cassette tapes with respect to the guides (guides from the guide around which the tape coming out of the S reel is wound to the S tension regulator guide side) is the same. Arrange the guides so that
The diameter of each reel is set so that the diameter of each reel is set, and the strength of the S tension regulator spring 10 is automatically adjusted depending on the size of the cassette.

That is, in FIG. 1, the tape path in the case of the small cassette 19 first passes through the small diameter reel hub 24a or the large diameter reel hub 2.
The tape coming out from 4b is the fixed guide G], G3...
...and reaches the S tension regulator arm guide G4.

Further, in the case of the large cassette 20, the tape path is such that the tape coming out from the small diameter reel hub 21c or the large diameter reel hub 24d passes through fixed guides G2, G3, . . . and reaches G4.

In this case, the winding angle of the tape with respect to the fixed guides Gl, G3, G4 and the fixed guide G2. G3. Each guide shaft and the S reel shaft are arranged so that the winding angle of the tape with respect to G4 is approximately equal and has a positional relationship.

Next, the strength of the spring 10 is automatically adjusted as described below.

For example, when the small cassette 19 is inserted into the cassette amplifier board 21 and pushed in the C direction as shown in FIG. 15a doesn't work (・.

Therefore, the S-tension operating lever 6, the operating rod 7, and the S-tension operating lever 8 connected to the lever 15a do not operate in conjunction with each other. It is also possible to apply a load force to the reel stand 1c via 11.

On the other hand, when the large cassette 20 is inserted as shown in FIG. 2, the detection lever 18a moves to the position indicated by the two-dot chain line.
When the cassette amplifier board 21 is pushed in the C direction in this state, unlike when inserting a small cassette, each lever 15b,
15 ay 14 a, 14b.

6.7, 8 and spring 10 are interlocked, tension band 1
The force applied to γ becomes stronger due to the spring 10.

Thus, according to the present invention, the following effects can be obtained by improving the magnetic recording and reproducing apparatus that can automatically vary the span length of the reel stand by determining the sizes of large and small cassettes as described above.

(a) Since the cassette detection lever is completely separated from the cassette surface, no lateral pressure is applied to the reel stand shaft, and the reel stand rotates smoothly.

(b) The cassette fits better on the cassette guide shaft.

(c) The reel easily enters the reel stand when inserting the cassette.

(→ The reel stand is elongated when the cassette is seated on the guide shaft, so it will not fluctuate due to external force.
・.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of one embodiment of the present invention, and Fig. 2 is a schematic diagram of an embodiment of the present invention.
FIG. 3 is a cross-sectional view taken along line AA' in the figure, FIG. 3 is a view taken from direction B in FIG. 1, and FIG. 4 is a view showing the longitudinal direction of the longitudinal mechanism used in the present invention. 1a-1c...Reel stand, 2, 2'...
・IJ-le V bar, 6...Tension operation lever, 12...Reel switching plate.

Claims (1)

[Scope of utility model registration request] A pair of rotatable reel levers, a pair of reel stands placed on the reel levers, a reel switching plate that moves according to the size of the cassette when a cassette is inserted, and this reel switching plate. and a means for interlockingly rotating the reel lever in a predetermined direction, the size of the large and small cassettes can be determined and the span length of the reel stand can be automatically varied, when the cassette is inserted. A cassette amplifier board configured to be able to be lowered toward the reel stand in a state of Move the cent detection lever, engage the cassette detection lever and the reel switching plate as the force cent amplifier board descends, rotate the reel lever, and rotate the reel lever to create a ruse span length corresponding to the large force cent. A magnetic recording/reproducing device characterized in that the magnetic recording/reproducing device is configured to change to.