JPS6211Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention makes it possible to easily and accurately measure the insertion amount of a magnetic head into a tape cassette in a magnetic recording/reproducing device using a tape cassette, and to determine whether the insertion amount of the magnetic head is appropriate. The present invention provides a magnetic head insertion amount measuring device that is easy to use.

Generally speaking, in a cassette-type magnetic recording/reproducing device in which the magnetic head is moved and inserted into a tape cassette so as to come into contact with the magnetic tape, if the magnetic head is not inserted into the tape cassette too far, the front surface of the magnetic head may touch the magnetic tape. If the amount of insertion is too large, the pads facing the magnetic head and in the cassette may become in contact with each other. During this time, the magnetic tape is held with a relatively large force, which impedes smooth running of the tape, and in this case as well, there is a drawback that recording and playback cannot be performed satisfactorily. Therefore, the amount of insertion of the magnetic head into the cassette must be set to an appropriate value that will not cause the above-mentioned drawbacks, and the attachment of the magnetic head to the head board must also be done with this in mind. However, when the entire magnetic recording and reproducing device is assembled,
The amount of insertion of the magnetic head into the cassette may not be the desired value due to variations in the dimensions of each member, assembly errors, etc., and the above-mentioned drawbacks may occur. Before sending the assembled magnetic recording/reproducing device to the market as a product, it is necessary to check whether the insertion amount of the magnetic head into the cassette is appropriate to prevent defective devices from entering the market as much as possible.

For this reason, various methods have been used to measure the amount of insertion of a magnetic head into a tape cassette. Measure the distance ₁ between the front surface 1a of the cassette 1 and one end surface 2a of the entire device 2 when the cassette 1 is attached, and press the play button with the cassette 1 removed to open the recording/reproducing magnetic head 3. Move the magnetic head forward, measure the distance ₂ between the front surface of the head 3 and one side surface 2a of the cassette mounting opening provided in the main body 2 with a ruler 4, calculate _1-2 , and insert the magnetic head ₃ into the cassette 1. There was one with an insertion amount of . However, this method requires computational processing;
If ₁ is not measured correctly, there will be a large error no matter how accurately ₂ is measured.When measuring ₂ , the way to apply the ruler 4 and the way to grasp the front position of the magnetic head 3 will vary depending on the measurer. There are various drawbacks, such as the fact that measurement results tend to vary due to differences, and overall accuracy is poor and it is time consuming. Therefore, in order to easily measure the insertion amount of the head, insert the magnetic head 3 as shown in Figure 2.
A scale part 5 is provided on the top surface from the front side toward the rear, and a magnetic head 3 is attached to the cassette 1 installed in the device.
A method has been devised in which when the cassette is inserted, it is determined which line of the scale section 5 is hidden inside the cassette, and the scale at the boundary position is read. However, in this method, all the magnetic heads 3 have scale portions 5.
Since it is necessary to provide a scale, the cost is high, and if there is any variation in the scale part 5, it will directly appear as a variation in the measurement results, which is not desirable in terms of accuracy.Furthermore, the scale is easy to read, etc. However, this has not yet been realized.

SUMMARY OF THE INVENTION Therefore, the present invention solves these conventional drawbacks and provides a magnetic head insertion amount measuring device that can measure the insertion amount of a magnetic head easily and accurately, and can easily read the insertion amount. below,
Embodiments of the present invention will be described with reference to the drawings.

3 to 5 show an embodiment of the present invention, and reference numeral 11 is a case of the measuring device in this embodiment. As is clear from the figure, this case 11 has almost the same shape and dimensions as a tape cassette containing a magnetic tape, and is made by combining an upper case 11a and a lower case 11b and joining them together with screws or the like. It is formed. Therefore, the front surface of the case 11 has an opening 12 for inserting an erasing head,
A recording/reproducing head insertion opening 13 and a pinch roller insertion opening 14 are provided, and a small opening 1 is provided between the openings 12 and 13 and between the openings 13 and 14.
5 and 16 are provided, and reel shaft insertion holes 17 and 18 are provided in the main surface of the case 11.
Inside the case 11, as shown in FIG.
0 and 21 so as to be movable along the arrow AB direction, that is, the moving direction of the magnetic head. This moving member 19 is urged in the direction of arrow B by a tension spring, and the guide shaft 20
is held in position by coming into contact with one end of a long hole provided in the moving member 19. Further, one end 19a of the moving member 19 faces the recording/reproducing head insertion opening 13.

31 is a first rotation arm 31 attached to the case 11 so as to be rotatable around the shaft 30;
The rotating arm 31 is rotatably connected to the moving member 19 by engaging a square hole 32 provided at one end 31a with a shaft 33 provided on the moving member 19. Also, the other end 3 of the rotating member 31
One end of a rope 34 is connected to 1b, and this rope 34 is routed through a guide roller 35 rotatably provided in the case 11, and the other end of the rope 34 is connected to a guide roller 35 that is movable in the direction of arrow CD. The first auxiliary moving member 36 is coupled to one end of the first auxiliary moving member 36 . A tension spring 3 is connected between the other end of the auxiliary moving member 36 and the case 11.
7 is suspended. This tension spring 37 is used to eliminate slack in the rope 34 and to
It has a function of urging the moving member 19 back in the direction of arrow B through the arrow B. The above auxiliary moving member 3
6 is provided with a scale 48 for measuring the insertion amount,
They are opposed to each other so that they can be seen through the see-through window 28 of the case 11.

Further, the shaft 30 and one end 31 of the rotating arm 31
The length ₃ between the engaging parts of the shaft 33 of a is set shorter than the length ₄ between the rotating shaft 30 and the rope connecting part of the other end 31b. Therefore, the rotating arm 31
If one end 31a is moved by Δ in the direction of arrow A, the other end 31b of the rotating arm 31 is moved by A× ₄ / ₃ (>Δ).

Reference numeral 41 designates a second rotating arm 41, which is rotatable around the shaft 40 and whose one end 41a is connected to the shaft 33 of the moving member 19 as shown in FIG.
A second rope 44 is connected to b, routed through guide rollers 45a and 45b, and connected to a second auxiliary moving member 46. A biasing tension spring 4 is provided between the second auxiliary moving member 46 and the case 11.
7 is suspended. A pointer mark 49 is provided on the second auxiliary moving member 46 and faces the see-through window 28 .

According to the second embodiment having such a configuration, when the moving member 19 is moved in the direction of arrow A by inserting the magnetic head 29 into the opening 13 of the case 11,
This movement is converted into a rotation of the first and second rotation arms 31 and 41, and the first and second auxiliary moving members 36 and 46 are moved by the arrows D and C through the ropes 34 and 44.
move in the direction. At this time, the amount of movement of the first and second auxiliary moving members 36 and 46 becomes larger than the amount of movement of the moving member 19, that is, the amount of insertion of the head 29. Since the first auxiliary moving member 36 and the second auxiliary moving member 46 move by the same amount in different directions (that is, the member 36 in the D direction and the member 46 in the C direction), relatively speaking, , pointer mark 4
9 is moved twice relative to the scale portion 48, which makes reading the scale easier. This scale part 48
Since it has been corrected in advance with _4/3 x 2 _, the insertion amount of the head can be directly connected.

In this embodiment, the pointer mark 49 may be provided on the first auxiliary moving member 36 and the scale portion 48 may be provided on the second auxiliary moving member 46. Note that the scale section in the above embodiment is not limited to a scale with numbers attached, but also includes a scale in which the allowable range is indicated by a colored line.

As described above, the magnetic head insertion amount measuring device of the present invention uses a case having almost the same shape and dimensions as the tape cassette, and a movable member that is moved when the magnetic head is inserted is provided in the case. The amount is enlarged so that it can be read on a scale, and according to the present invention, the amount of the head inserted into the cassette can be easily measured by attaching the device in the same way as attaching a tape cassette. It can be measured with higher precision than conventional methods. If only one device of the present invention is used, the amount of head insertion can be measured without any modification to the magnetic recording/reproducing device, so it can be implemented at low cost. Furthermore, since the amount of movement of the moving member is read using a relatively moving scale and pointer, the reading operation can be made even easier.

[Brief explanation of the drawing]

1 and 2 are schematic plan views showing a conventional magnetic head insertion amount measuring device, FIG. 3 is a perspective view showing a device according to an embodiment of the present invention, and FIG. 4 is a partially cutaway view of the same device. FIG. 5 is a perspective view of essential parts of the device, and FIG. 6 is a plan view of the device. DESCRIPTION OF SYMBOLS 11... Case, 13... Magnetic head insertion opening, 19... Moving member, 29... Magnetic head, 3
1... Rotating arm, 34... Rope, 35... Guide roller, 36... Auxiliary moving member, 37... Tension spring, 41... Rotating arm, 44... Rope, 45a, 45b... Guide roller , 46...
Auxiliary moving member, 47... tension spring, 48... scale section, 49... pointer mark.

Claims (1)

[Scope of utility model registration request] A movable member is movably provided in a case having approximately the same shape and dimensions as a tape cassette containing a magnetic tape, and one end of the movable member faces the magnetic head insertion opening of the case. One end of the second rotating member is rotatably connected, and the first and second rotating members extend from both side surfaces of the movable member, and the first and second rotating members The length of one end of the movable member and the center of rotation is shorter than the length of the other end and the center of rotation, and one ends of the first and second ropes are connected to the other ends of the first and second rotary members, respectively. and route these first and second ropes via a guide member, and connect the other ends of the first and second ropes to the first and second auxiliary moving parts, respectively, and A biasing means is provided between the second auxiliary moving member and the case, and a movement measuring pointer is provided on one of the first and second auxiliary moving members and a scale portion is provided on the other, and the pointer and The case is provided with a see-through window through which both the scale part and the scale part can be seen, and the first and second auxiliary moving members are configured to move in opposite directions when the magnetic head is inserted into the case. measuring device.