JPH056582Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing apparatus, and more particularly to a magnetic recording/reproducing apparatus capable of always maintaining a constant tape tension even when using a magnetic erasing head.

2. Description of the Related Art Conventionally, a fixed erase head (full-width erase head) provided in a magnetic recording/reproducing apparatus is often constructed by forming a gap in a magnetic core made of ferrite and winding a coil around the gap. The operation of the erase head was electrically controlled by applying and removing current to the coil. However, since the erase head formed by winding a coil around the magnetic core has a complicated structure and is expensive, erase heads using permanent magnets have been proposed in recent years. Since this magnetic type erase head cannot be electrically controlled, the erase operation can be controlled by moving the magnetic type erase head to a position where it comes into contact with the tape during recording, and away from the tape during playback. was doing.

Problems to be Solved by the Invention In general, in a magnetic recording/reproducing device, as shown in FIG. A predetermined tape path is formed to be attached to the drum 6. The erasing head 7 is arranged between the impedance roller 4 and the guide pole 5. When the magnetic recording/reproducing device is in the recording mode, the erasing head 7 is in contact with the magnetic tape 1 as shown by the solid line in the figure, and when it is in the playback mode, it is retracted to the position shown by the dashed line in the figure and the erase head 7 is in contact with the magnetic tape 1 as shown by the solid line in the figure. Separate from tape 1.

Now, the tape running load applied to the magnetic tape 1 by the tension pole 3 is _T1 , and similarly the tape running load applied by the impedance roller 4 is _T2 ,
Assuming that the tape running load T ₃ is applied by the erasing head 7, the tape running load T ₄ applied to the guide pole 5 in the recording mode is T ₄ =T ₁ +T ₂ +T ₃ . On the other hand, in the playback mode, since the erasing head 7 is separated from the magnetic tape 1, the tape running load T ₄ ' applied to the guide pole 5 is T ₄ '=T ₁
+T ₂ . Therefore, since the tape tension with respect to the guide drum 6 changes in the recording mode and the playback mode, the so-called contact between the magnetic tape 1 attached to the guide drum 6 and the magnetic head changes, and as a result, There were problems in that the head scan traced a trajectory slightly different from that during recording, leading to a reduction in reproduction output and a loss of compatibility. Further, when the erasing head 7 is retracted, the distance between the impedance roller 4 and the guide pole 5 becomes longer, and there is a problem that the erase head 7 is easily affected by disturbances.

Therefore, the present invention solves the above problems by providing a tape running load adjusting means that comes into contact with the magnetic tape and maintains the running load of the magnetic tape constant when the erasing head is in a position away from the magnetic tape. The purpose is to provide a recording/playback device.

Means and Effects for Solving the Problems In order to solve the above problems, in the present invention, the magnetic tape stretched from the front opening of the tape cassette is pulled out and attached to the guide drum over a required angle range. In a magnetic recording and reproducing apparatus, a magnetic recording and reproducing apparatus is provided with a loading means for forming a tape path on a magnetic tape, and an erasing head consisting of an erasing magnet configured to come into contact with the magnetic tape on which the tape path has been formed during recording and to separate from it during reproduction, A tape running load adjusting means is provided which is displaced as the erasing head is moved from the contact position to the separation position and comes into contact with the magnetic tape to apply a load to the magnetic tape.

By configuring the magnetic recording and reproducing apparatus as described above, even when the erasing head is separated from the magnetic tape, a load is applied to the magnetic tape, and a constant tape tension can be achieved regardless of whether recording or reproducing is performed. .

Embodiment Next, an embodiment of the magnetic recording/reproducing apparatus according to the present invention will be described with reference to FIG. The magnetic recording/reproducing device 8 (hereinafter abbreviated as VTR) shown in the figure includes a main chassis 9, a tape loading mechanism 10, a guide drum 11, an erasing head 12, and a tape running load adjusting means 1, which is the main part of the present invention.
There is a 3rd prize.

A tape loading mechanism 10 loads a magnetic tape 15 (both shown by a dashed line in the figure) from a front opening of a tape cassette 14 loaded at a predetermined position into a guide drum 11 at a required angle range during recording and reproduction by a tape cassette transport mechanism (not shown). It has the function of pulling out so that it can be attached over a period of time. Each configuration of the tape loading mechanism 10 will be explained below. Reference numerals 16a and 16b are loading bases, and guide poles 17a and 17b and loading poles 18a and 18b are installed at the upper part thereof. The loading bases 16a, 16b are configured to move by being guided by guide rails 20a, 20b provided on both side edges of the sub-chassis 19 by a drive mechanism (not shown). (indicated by the two-dot chain line in the figure). The sub chassis 19 is provided above the main chassis 9 so as to be substantially parallel thereto. The side edges of the sub-chassis 19 are formed in a shape that corresponds to a predetermined movement trajectory along which the loading poles 18a and 18b move when pulling out the magnetic tape 15 to a predetermined loading position during recording and reproduction. Therefore, the sub chassis 19
Guide rails 20a, 20b provided on the side edges of
is loading pole 1 during loading
They are arranged at positions corresponding to predetermined movement trajectories of 8a and 18b. Loading base 16a, 16
Loading poles 18a, 18 provided at b
b performs the function of pulling out the magnetic tape 15 from the tape cassette 14 to a predetermined loading position when the VTR 8 enters the recording/playback mode. At this time,
The tension arm 22 and impedance roller 23 disposed on the supply reel 21 side, and the first and second drawer arms 25, 26, pinch roller 27, etc. disposed on the take-up reel 24 side are also displaced, and the main shear shaft The magnetic tape 15 forms a predetermined tape path together with the guide poles 28, 29 and the capstan shaft 30 installed on the magnetic tape 9, and the guide drum 11 performs magnetic recording and reproduction.
In the figure, reference numeral 31 indicates a tension pole implanted in the tension arm 22, reference numerals 32 and 33 indicate the extension poles implanted in the first and second drawer arms 25 and 26, and reference numeral 34 indicates a cap for the pinch roller 27. A pinch roller solenoid is pressed into contact with the stan shaft, and 35 is an audio/control head for reading time codes and the like.

The erasing head 12 is a so-called magnetic erasing head using a permanent magnet, and is fixed to an erasing head base arm 37 (hereinafter referred to as the base arm) rotatably supported on a support shaft 36 of an impedance roller 23. ing. Further, an erasing head driving solenoid 38 is connected to a position near the upper end of the base arm 37. The base arm 37 is rotated about the support shaft 36 by the erase head driving solenoid 38 . That is,
When the VTR 8 is in the recording mode, the erasing head drive solenoid 38 has its arm portion 38a in the figure.
The base arm 37 is displaced in the X ₁ direction, and the base arm 37 is
6, the erasing head 12 comes into contact with the magnetic tape 15 (at the position indicated by the solid line in the figure), and the previously recorded information on the magnetic tape 14 is erased. On the other hand, when the VTR 8 is in the playback mode, the arm portion 38a is displaced in the _X2 direction in the figure, and the erasing head 12 is separated from the magnetic tape 15 (indicated by a chain line in the figure). A lever portion 37a is provided on the side of the shaft bearing portion of the base arm 37, and a coil spring 39 is connected to this lever portion 37a. Yotsute base arm 3
7 is always urged to rotate clockwise.

Next, the tape running load adjusting means 13, which is the main part of the present invention, will be explained. The tape running load adjusting means 13 is connected to the support shaft 4 provided near the support shaft 36.
0, a load adjustment arm 42 with a load adjustment pole 41 implanted in the other end, a gear portion 42a formed coaxially with the bearing of the load adjustment arm 42, and a bearing of the base arm 37. It is composed of a gear section 43 and the like formed coaxially with the section. Gear portion 42 formed on load adjustment arm 42
a is a gear portion 43 formed on the base arm 37;
It is configured to mesh with the Therefore, the load adjustment arm 42 is rotated in conjunction with the rotational displacement of the base arm 37, and its rotation direction is the same as that of the base arm 3.
The rotation is opposite to the rotation direction of step 7.

Here, when the VTR8 is in recording mode,
Further, the operation of the tape running load adjusting means 13 in the playback mode will be described in detail with reference to FIGS. 2 and 3. Note that FIG. 2 shows the VTR 8 in the recording mode, and FIG. 3 shows the VTR 8 in the playback mode. When the VTR 8 is in recording mode, as mentioned above, the erase head drive solenoid 3
The arm portion 38a of No. 8 is displaced in the _X1 direction in the figure, the base arm 37 is rotated clockwise, and the erasing head 12 is in contact with the magnetic tape 15 (indicated by the two-dot chain line in the figure). . At this time, the load adjustment pole 41 provided on the load adjustment arm 42 is configured to be located away from the magnetic tape 15. Therefore, in the recording mode, when the erasing head 12 comes into contact with the magnetic tape 15, a tape running load (hereinafter this tape running load will be referred to as T) is applied.

Next, the third section describes the operation of the tape running load adjusting means 13 when the VTR 8 is switched to the playback mode.
This will be explained using figures. When the VTR 8 enters the playback mode, the arm portion 38a of the erasing head drive solenoid 38 is displaced in the _X2 direction in the figure, and the base arm 37 is accordingly rotated counterclockwise about the support shaft 36 to erase the data. Head 12 is magnetic tape 1
Separate from 5. As mentioned above, base arm 3
A gear portion 43 formed at 7 is a load adjusting arm 42.
Because it meshes with the gear portion 42a formed in the
The load adjustment arm 42 rotates clockwise in accordance with the rotation of the base arm 37, and the load adjustment pole 41
comes into contact with the magnetic tape 15. As the load adjustment pole 41 comes into contact with the magnetic tape 15, a tape running load is applied to the magnetic tape 15. At this time, the contact force of the load adjustment pole 41 against the magnetic tape 15 is configured so that the tape running load caused by the load adjustment pole 41 is equal to the magnitude of the tape running load T generated by the erasing head 12.

By configuring the tape running load adjusting means 13 as described above, even if a magnetic erasing head 12 that makes contact with and separates from the magnetic tape 15 is used, the erasing head 12 is located at a distance from the magnetic tape 15. Since the load adjustment pole 41 sometimes comes into contact with the magnetic tape 15, a constant tape running load is always applied to the magnetic tape 15 regardless of the recording mode or the reproduction mode, and the tape running becomes stable. As a result, the tape running load applied to the guide pole 17a during loading is always constant, and the tape tension of the magnetic tape 15 with respect to the guide drum 11 can also be kept constant, making it possible to reliably prevent a decrease in playback output and to ensure compatibility. can maintain sex. Also, the guide pole 18 at a predetermined tape path of the magnetic tape 15
Since the erase head 12 comes into contact with the magnetic tape 15 in the recording mode and the load adjustment pole 41 comes into contact with the magnetic tape 15 in the playback mode between the tension pole a and the tension pole 31, the distance between the two poles does not become unnecessarily long. It is possible to prevent the influence of disturbances on the part.

In the above embodiment, the tape running load adjusting means 13 uses the erasing head driving solenoid 38 that rotationally displaces the erasing head 12, and uses this as a driving source to displace the load adjusting pole 41. Of course, the present invention is not limited to this, and the displacement may be performed using a driving force of another configuration, or a separate driving means may be provided and the displacement may be performed using this.

Effects of the Invention As described above, according to the magnetic recording and reproducing device of the present invention, the tape is displaced and comes into contact with the magnetic tape as the erasing head moves from the contact position to the separated position, thereby applying a load to the magnetic tape. By providing the running load adjusting means, a load is applied to the magnetic tape by the tape running load adjusting means even when the erasing head is separated from the magnetic tape.
A predetermined tape running load is always applied to the magnetic tape, the tape tension of the magnetic tape relative to the guide drum can be kept constant, and a decrease in playback output can be reliably prevented and compatibility can be maintained. Furthermore, when the magnetic tape forms a predetermined tape path, either the erasing head or the tape running load adjusting means is in contact between the guide pole and the tension pole, so the distance between the two poles is unnecessarily long. This does not occur, and it has the advantage of being able to prevent the influence of disturbances on this part.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the magnetic recording and reproducing apparatus according to the present invention, FIG. 2 is an enlarged plan view showing the tape running load adjusting means when the VTR is in recording mode, and FIG. 3 is a plan view of the VTR. FIG. 4 is a plan view showing an enlarged view of the tape running load adjusting means when the device is in the playback mode, and FIG. 8...VTR, 10...Tape loading mechanism, 11...Guide drum, 12...Erasing head, 13...Tape running load adjustment means, 14...
Tape cassette, 15...Magnetic tape, 17a,
17b... Guide pole, 22... Tension arm, 23... Impedance roller, 36...
Support shaft, 37...Base arm, 38...Solenoid for erasing head drive, 38a...Arm portion, 40
... Support shaft, 41 ... Load adjustment pole, 42 ... Load adjustment arm, 42a, 43 ... Gear section.

Claims (1)

[Claims for Utility Model Registration] (1) A loading means for forming a tape path so that a magnetic tape stretched over a front opening of a tape cassette is pulled out and attached to a guide drum over a required angle range; In a magnetic recording/reproducing device comprising an erasing head consisting of an erasing magnet configured to come into contact with a magnetic tape having a tape path formed thereon during recording and separate from it during playback, the erasing head moves from a contact position to a separated position. 1. A magnetic recording and reproducing apparatus comprising: a tape running load adjusting means that displaces with the displacement of the magnetic tape and comes into contact with the magnetic tape to apply a load to the magnetic tape. (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the tape running load adjusting means is configured to be driven using the driving force for moving the erasing head. (3) The erasing head is rotationally displaced around the rotation axis of an adjacent impedance roller, and the tape running load adjusting means is driven by this rotational force, as described in claim 2 of the utility model registration. magnetic recording and reproducing device.