JPH07192361A - Magnetic recording and reproducing device and method thereof - Google Patents

Abstract

PURPOSE:To attain a high precision positioning and posture in order to perform the recording and reproducing without flawing a magnetic tape accompanying the rewinding of the magnetic tape with reduced movable mechanisms and a thin-sized and simple guide mechanism. CONSTITUTION:A mechanism for drawing out the magnetic tape from a reel in a cartridge is divided roughly in three, and a 2nd threading mechanism has a tension arm 7 for detecting the tension state of the magnetic tape and a draw-out arm 10 for drawing the magnetic tape in no sliding contact with the tape at the time of recording and reproducing but in sliding contact with the magnetic tape only at the time of threading. And a 3rd threading mechanism for winding the magnetic tape around a drum mounted with a magnetic head is attained by using a guide member disposed on a turning ring, and a rotary center shaft of the drum mounting the magnetic head is disposed on the inner side of the turning ring. A 3rd tape path is formed by plural roller guides 21a and 21b fixed on a chassis 3, plural roller guides 21d-g and a tension guide 23, provided on a movable loading ring 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helical scan type magnetic recording / reproducing apparatus and method.

[0002]

2. Description of the Related Art As a magnetic recording / reproducing apparatus using a single reel cartridge, a model name, M2481A (Fujitsu Limited), which is a parallel track recording method using a fixed head, has been commercialized. This storage device has a width of 8
Inch, device height 5 inches, data transfer rate 1.5MB
It has a maximum capacity of 200 MBytes / roll. Further, in the above-mentioned device, one end of the tape is suspended on the winding side reel, and at the same time, the tape is wound around the fixed head to form a tape traveling path for recording / reproducing.

On the other hand, as a large-capacity, high-transfer-speed magnetic recording / reproducing apparatus using the helical scan system, the model name is DS
The T600 (made by AMPEX) has been commercialized, and the device has a width of 17 inches, a height of 12.25 inches, a depth of 28 inches, a maximum capacity of 165 GBytes / roll, and a data transfer rate of 1
It has a performance of 5 MByte / s. The recording medium is of a cassette type having a supply side reel and a winding side reel in a case, and a magnetic tape is suspended between both reels. With the guide installed on the movable base, pulling the tape suspended on both reels by moving the base,
It is wound around a drum having a magnetic head to form a tape running path for recording and reproducing.

[0004]

DISCLOSURE OF THE INVENTION In the prior art,
There are the following issues.

The parallel track recording type magnetic recording / reproducing apparatus using the fixed head has a low transfer rate and a small storage capacity per one turn.

The helical scan type magnetic recording / reproducing apparatus has a large transfer rate and a large capacity, but has a large apparatus size, and it is necessary to increase the installation location.

In order to form a tape path for recording / reproducing by a helical scan method using a single reel cartridge, the tape is pulled out from a file reel and suspended on the machine reel, and then the machine reel is loaded. It is necessary to pull out the tape from the suspended state and wind the tape around the drum. As described above, the helical scan type magnetic recording / reproducing apparatus using the single reel cartridge requires a mechanism for forming a tape running path and a space.

The tape running path for recording / reproducing by the helical scan system becomes a three-dimensional running system for helically winding the tape around the drum. Therefore, when winding the tape around the drum in a narrow space, geometrical imbalance of the tape is likely to occur due to the winding operation, and therefore, the tape edge is fixed by the flange portion of the guide that regulates the position in the tape width direction. May be damaged.

An object of the present invention is to downsize a helical scan type magnetic recording / reproducing apparatus using a single reel cartridge, to improve reliability and to increase recording density. More specifically, in a plane perpendicular to the insertion direction of the single reel cartridge, the width of the device is 8 inches or less, the height of the device is 5 inches or less, the effective data transfer rate is 11 MByte / s, and the data storage capacity is 20 GByt.
It is to construct a magnetic recording / reproducing apparatus while having a performance of e or higher and protecting a magnetic tape.

[0010]

[Means for Solving the Problems] In order to achieve miniaturization, high reliability and high recording density of an apparatus, first,
A matter to be considered is stable running of the magnetic tape.
Furthermore, it is how to load and unload tapes safely and at high speed. And how to downsize such a mechanism.

The present application discloses a magnetic recording / reproducing apparatus having characteristics peculiar to the threading mechanism and the like of the magnetic tape. That is, when a single reel cartridge is inserted into the magnetic recording / reproducing apparatus, the magnetic tape is pulled out from the reel of the cartridge and suspended from the first threading mechanism and the machine reel in the magnetic recording / reproducing apparatus. , A second threading mechanism for pulling out the magnetic tape and increasing the tape pull-out area, and a position where recording and reproduction are possible, that is,
A third threading mechanism for winding a magnetic tape is provided on a drum having a magnetic head for recording and reproducing.

Further, the second threading mechanism has a tension arm for detecting the tension state of the magnetic tape, and does not make sliding contact with the tape at the time of recording / reproducing, but makes sliding contact with the magnetic tape only at the time of threading. It has a pull-out arm for pulling out the magnetic tape. The arm is provided with a guide substantially parallel to the rotation center axis of the file reel and a guide inclined at a predetermined angle.

Further, the third threading mechanism is
By using the guide member arranged on the rotating ring, the rotation center axis of the drum having the magnetic head is arranged inside the rotating ring.

[0014]

With the above device configuration, it is possible to save space in the magnetic recording / reproducing device, increase the data transfer speed, and increase the recording density. That is, the pull-out arm of the second threading mechanism is provided with a guide substantially parallel to the rotation center axis of the file reel and a guide inclined by a predetermined angle, and is pulled out by sliding contact with the magnetic tape only during the second threading. Therefore, the geometric imbalance of the magnetic tape due to the winding of the tape around the drum by the rotating ring can be eliminated. Therefore, there is no risk of damaging the magnetic tape. Further, since the third tape path is mainly formed by a plurality of roller guides fixed on the chassis 3 and a plurality of roller guides and tension guides provided on the movable loading ring, the movable mechanism is reduced. Therefore, it is possible to use a simple guide mechanism for highly accurate positioning and posture determination for recording and reproduction.
Particularly, in the mechanism for positioning and fixing after moving, the mechanism for mounting the roller guide is only the loading ring, which is very advantageous for downsizing, cost reduction, and high reliability of the device.

[0015]

EXAMPLES An example of the present invention will be described below. FIG. 1 is a perspective view of a helical scan type magnetic recording / reproducing apparatus, and FIGS. 2, 3 and 4 are a tape pattern, a top view and a side view of the apparatus, respectively. The outline of the device is shown in Fig. 1.
The width W of the device is 8 inches, the height H is 5 inches, and the depth D is 15.5 inches. FIG. 2 is a detailed view of the tape pattern recorded by the drum 1 on which the magnetic head for recording / reproducing is mounted. On the magnetic tape,
There are a linear track 32 for recording a tape position signal in the longitudinal direction of the tape, a linear track 33 for controlling the tape feed speed, a linear track 34 for backup and a helical track 35 for recording data. On the helical track 35, from the lower end of the magnetic tape, the preamble 35
c, a data area 35b, and a postamble 35a. Error correction data is added to the data and recorded in the data area of the helical track 35.

The recording method is an azimuth recording method having an angle of ± 20 ° with respect to the scanning direction of the rotary magnetic head. That is, as shown in FIG. 11, two of positive azimuth and negative azimuth
Each head is used as one set of magnetic heads (1e2, 1e
4) Approximately 180 °, place two pairs with the backs facing each other.
The positive or negative azimuth recording head or reproducing head performs recording or reproducing substantially at the same time.

A 1/2 inch width, 195 m long magnetic tape has a helical track width of 20 μm and a shortest recording wavelength of 0.77.
By recording with μm, recording coding system 8-14 conversion, and recording system NRZ, the data storage capacity becomes 32,640 bytes per track. The length of the tape wound around the single reel cartridge 6 is 195 m for the 14 μm thick tape, and the storage capacity per roll is 27 GByte and 317 m is 54 GByte. Also, with a tape having a thickness of 11 μm, the tape can be wound around the single reel cartridge 6 by 439 m, and the capacity is 69 GBytes. Furthermore, if the tape of 7 μm thickness used for 8 mm video is used, the tape can be wound about 690 m, resulting in a storage capacity of 108 GByte. The magnetic material of the tape is metal magnetic powder. Also, the tape speed during recording was 83.82 m / s, and the drum speed was 5400 rp.
m, and recording heads 1ca1, 1cb1, 1 on the middle drum 1d which rotates with respect to the upper drum 1a and the lower drum 1b.
cc1, 1cd1 and four reproducing heads 1ca2, 1c
By mounting four b2, 1cc2, and 1cd2, four helical tracks can be scanned by one rotation of the drum, so that the data transfer rate is about 11.7 Mbyte / s.

The arrangement of parts on the chassis 3 will be described with reference to FIG. On the chassis 3, magnetic heads 1ca1, 1cb1, 1cc1, 1cd1, 1ca2 for recording / reproducing,
Roller guides 21e, 21 that rotate with respect to the support shaft are provided for guiding the traveling of the drum 1 and the tape 2 (Fig. 2) on which 1cb2, 1cc2, 1cd2 (Fig. 11) are mounted.
f, 21g, air guides 21a, 21b, 21c, 2 which are provided with holes in the portions for guiding the running of the tape and blow out air.
1d, a pinch roller 20 which is a member for pressing the tape onto the rotary shaft of the capstan 19, and a loading ring 4 which performs tape winding (third threading) on the drum 1 for recording and reproduction. A file reel die 24 having a clutch 24a and a motor section 24b for mounting a loading ring 4 having an angled tilt guide 18 and roller guides 21e, 21f, 21g and a file reel 6a in a tape single reel cartridge 6 (see FIG. 4). 12), a machine reel 5 for winding the tape 2 supplied from the file reel 6a in the single reel cartridge 6, a single reel cartridge 6
The leader block 11 (FIG. 3) attached to one end of the tape 2 wound inside the single reel cartridge 6
First threading mechanism 14 for transporting from the machine reel 5 to the machine reel 5, a cartridge loader 17 for mounting / removing the single reel cartridge 6 to / from the motor part 24b of the file reel die 24, and after the first threading, the tape is cut across the loading ring 4 and the tape is pulled out. , Drawer arm 1
0 (FIG. 3) and the tension detection guide 23, the tension arm 7 (second threading mechanism), the capstan motor 19 for driving the tape, the control head 9 for recording a signal for controlling the tape position, and the tape width direction. Erase head 8 for erasing signals, air guides 21a, 2
Air pump 1 for supplying air to 1b, 21c and 21d
6 is mounted.

The layout relationship of each main component will be described. A roller guide 21a for guiding the tape 2 near the drum 1,
Air guides are used for the rollers 21b and 21c and the roller guide 21d (FIG. 8) in which the tape is wound 180 degrees or more.
These roller guides 21a, 21b, 21c, 21d
The virtual guide diameter (φD + Δd) is obtained by adding the flying amount Δd to the air guide diameter φD in consideration of the tape floating amount (10 to 50 μm) due to the air blown from each guide.
Is geometrically arranged so that the tape is not twisted. In this embodiment, all the guides of the tape running system may be arranged as air guides.

A file reel die 24 (FIG. 4), a machine reel 5, and a drum 1 are arranged in this order in the longitudinal direction of the chassis 3, and a drive control is provided on a step between the chassis surface on which the drum 1 is mounted and the chassis surface on which the reel is mounted. The circuit board 28 (FIG. 12) for use is arranged. An RD / WR circuit board 27 is arranged below the chassis 3, a servo power amplifier circuit board 30 (FIG. 3) is arranged on the side surface of the device, and an interface control circuit board 31 (FIG. 4) is arranged above the chassis 3. ing.

The main parts on the chassis 3 will be described below. ○ drum 1 magnetic heads 1ca1, 1cb1, 1cc1, 1cd1,
A drum 1 (FIG. 10) having 1ca2, 1cb2, 1cc2, 1cd2 (FIG. 11) mounted thereon is attached to the chassis 3 at a predetermined angle (FIG. 4). The head scans the tape 2 (FIG. 8) helically wound around the drum 1 to record or reproduce a signal on the tape 2 (FIG. 2). The drum 1 includes an upper fixed drum 1a (FIG. 10), a lower fixed drum 1b, an intermediate drum 1d that is sandwiched between upper and lower drums and rotates, and recording heads 1ca1 (FIG. 11), 1cb1, 1cc1, 1cd mounted on the intermediate drum 1d.
1, reproducing heads 1ca2, 1cb2, 1cc2, 1cd
2, a fixing block 32 for holding and fixing the erasing heads 1e5, 1e6, the upper fixed drum 1a, and the lower fixed drum 1b (see FIG.
0) and the motor unit 36 and the like.

The arrangement of the magnetic head on the middle drum 1d is shown in FIG.
Shown in 1.

The tape 2 is recorded by azimuth recording having an angle of ± 20 ° with respect to the head scanning direction. Signals are recorded on the heads 1ca1, 1cb1, 1cc1, 1cd.
Done in 1. Two heads 1ca1 and 1cb1 or 1cc1 and 1 mounted on the head bases 1e2 and 1e4
The cd1 is a set of magnetic heads having positive azimuth and negative azimuth, and two sets of two magnetic heads are arranged on the middle drum 1d with their back surfaces facing each other by 180 °. For signal reproduction, 1ca2, 1cb2, 1cc2,
It is performed at 1 cd2.

Similarly to the recording head, the head base 1e
The heads having positive azimuth and negative azimuth mounted on the No. 1 and No. 1e3 are one set of reproducing magnetic heads (1ca2 and 1cb2 or 1cc2 and 1cd2), and 180 on the middle drum 1d.
° Mounted with the backs facing each other. As for the drum 1, although the upper fixing method is described in this embodiment, the upper drum,
An upper rotation system, which is composed of a lower drum and in which an upper drum equipped with a magnetic head rotates, may be used. Also, the magnetic head is
Two heads with positive and negative azimuth are set as one set and they are 180 ° rear facing, but positive azimuth on the head base,
Even if three heads in which a plurality of heads having negative azimuths are alternately adjacent to each other are arranged on one head base and the heads are arranged on the middle drum 1d in a 180 ° rear face or at a predetermined angle. Good.

Loading Ring 4 The loading ring 4 is inclined by a predetermined angle with respect to the chassis 3 (FIG. 1) and is supported by three members (not shown) that rotate on the inner circumference of the loading ring 4. , Can be rotated. The inclination angle of the loading ring 4 is set so that the tape is not geometrically twisted with respect to the tape when the winding of the tape around the drum inclined by a predetermined angle is completed. Loading ring 4
Above, pinch roller 20 (FIG. 3) and roller guide 21
e, 21f, 21g, tilt guide 18, air guide 2
1d is mounted and these members can revolve around a certain center point. The member of the loading ring 4 is hollow and has an air passage for supplying air to the air guide 21d. From the second threading state as shown in FIG. 6, the guide 21d mounted on the loading ring 4 pulls out the tape by rotating the loading ring 4 as shown in FIGS. 7 and 8.
Wrap the tape around drum 1. Here, the loading ring 4 has a ring shape, but if the same function can be achieved, it does not need to be a closed ring, and
It does not have to be ring-shaped.

○ Tape pull-out arm 10 (FIG. 3) On the tape pull-out arm 10, a tape guide 26,
An inclination guide 12 is mounted which is inclined at a predetermined angle with respect to the tape guide 26 and is rotatable with respect to the central axis of the tape guide 26. The inclination angle of the inclination guide 12 is such that the geometrical imbalance of the tape 2 is removed during the third threading of the tape 2 around the drum 1 and the height deviation of the tape 2 in the tape width direction is minimized. (Fig. 7). At the time of the first threading, the tape pull-out arm 10 is located inside the arcuate trajectory of the threader pin 22 (FIG. 4), and after the first threading, crosses over the loading ring 4 like the tension arm 7. , A predetermined tape path is formed (FIGS. 5 to 8). In the third threading, when the loading ring 4 rotates by a predetermined angle, the tilt guide 1 on the arm 10
2 rotates around the central axis of the tape guide 26 and contacts the tape 2 (FIG. 7). Immediately before the completion of the third threading, the tilt guide 12 separates from the tape. In this way, the tape guide 26 and the tilt guide 12 are guides that come into contact with the tape 2 only when loading or unloading. In this embodiment, the inclination angle is constant when the tape is in contact, but the inclination angle may be changed by appropriately moving it depending on the rotation angle of the loading ring 4.

Tension Arm 7 On the tension arm 7, a guide 23 is mounted upright (FIG. 5 or 6). The tension of the tape 2 is
3 is pressed to apply a rotating force to the rotating shaft of the tension arm 7. The tape tension is detected by a sensor (not shown) attached to the tension arm 7 based on the rotation angle of the tension arm 7. During the first threading,
The tape 2 is located inside the moving circular locus of the threader pin 22 (FIG. 4) and crosses over the loading ring 4 to project the tape 2 after the completion of the first threading (FIGS. 5 to 8).

Cartridge loader 17 The single reel cartridge 6 inserted from the insertion opening of the single reel cartridge 6 on the front of the apparatus is pulled into the apparatus (FIG. 12) and mounted on the file reel die 24.
Further, the tape single reel cartridge 6 is detached from the file reel 24 and ejected out of the apparatus. As shown in FIG. 9, the single reel cartridge has a width A of 109 m.
m, height B: 24.5 mm, depth C: 125 mm. As shown in FIG. 12, the single reel cartridge 6 moves horizontally and then vertically and is mounted on the file reel die 24. At the end of horizontal movement, the recessed portion of the leader block 11 engages with the thin portion of the threader pin 22, and at the end of vertical movement, the leader block 11 and the thick portion of the threader pin 22 that engages with the recessed portion of the leader block 11 engage.

○ Threader mechanism 14 Leader block 11 in single reel cartridge 6
Is conveyed from the file reel die 24 to the machine reel 5 (FIG. 5). The threader mechanism 14 includes a threader motor 14 that applies a driving force for the threader, a threader arm 15, and a threader pin 22 (FIGS. 4 and 12) that is shaped to engage with the recess of the leader block 11. Threader arm 1
By the rotation of 5, the threader pin 22 attached to the tip of the threader arm 15 pulls out the leader block 11 from the single reel cartridge 6. Leader block 1
1 is transported from the single reel 6 to the machine reel 5 in an arcuate path by the rotation of the threader arm 15. The first threading suspends the tape between both reels.

File reel die 24 (see FIG. 4 or FIG. 1)
2) At the tip of the shaft of the file reel die 24, there is attached a clutch 24a having a tooth profile that engages with metal teeth on the reel lower end surface (not shown) in the single reel cartridge 6. A magnet (not shown) mounted in the clutch 24a and metal teeth on the lower end surface of the reel attract each other by magnetic force, and the rotational driving force of the motor is transmitted to the file reel 6a (FIG. 3) of the single reel cartridge 6.

Machine reel 5 The machine reel 5 has a recess for engaging the leader block 11, and when the leader block 11 is inserted, the leader block 11 becomes integral with the machine reel 5 and forms a machine reel winding core around which a tape is wound. Become a part.

Capstan motor (not shown) It is attached to the chassis 3 with an inclination, and the tape 2 is sandwiched between the pinch roller 20 and the rotating shaft of the capstan 19. The tape is directly driven by the rotation of the rotating shaft of the capstan 19.

Next, the tape winding operation on the drum 1 will be described. By the cartridge loader 17 (FIG. 3), the leader block 11 to which one end of the tape 2 is attached is threaded from the single reel cartridge 6 mounted on the file reel die 24 (FIG. 4) to the threader pin 22 (FIG. 4) by the first thread mechanism. By drawer machine reel 5
To the first tape path (FIG. 5). After the leader block 11 is inserted into the machine reel 5, the second,
The tape length required for the third threading is wound by the machine reel 5.

After the tape 2 is suspended between the file reel 6a and the machine reel 5, the tape 2 is suspended by the second threading mechanism, that is, the tension arm 7 having the tension guide 23 and the tape pulling arm 10 having the tape guide 26. Is pulled out across the loading ring 4 to form a second tape path (FIG. 6). The tape 2 pulled out by the tape guide 26
However, the rotation of the loading ring 4 makes contact with the guide 21 d mounted upright on the loading ring 4. The drawer guide 26 is positioned when the drawer is completed so that the inclination direction of the guide 21d and the tape tension direction are substantially parallel to each other. After that, the tape pulled out onto the loading ring 4 is hooked by the guide 21d installed upright on the loading ring 4, and the tape 2 is wound around the drum 1 as the loading ring 4 rotates (FIG. 7) and recorded. A third tape path that can be played back is formed (FIG. 8). Guide 21d on loading ring 4, pinch roller 20, roller guides 21g, 21e, 21
A third tape pass is formed by the f and the inclined guide 18.

At the time of the third threading, the tape 2 is supplied from the machine reel 5 and the tape 2 is not supplied from the file reel 6a. The tension arm 7 detects the tape tension state during the third threading and changes the back torque of the machine reel 5 to keep the tape tension constant during the third threading to protect the tape. . Sliding contact with the tape 2 only during the rotation of the loading ring 4,
By the tilt guide 12 which is mounted on the tape pull-out arm 10 and which is tiltable and tilted at a predetermined angle, the tape roller guides 21a, 21b, 21 for the third threading are provided.
The tape height deviation with respect to c, 21d, 21e, and 21f is suppressed.

When the third threading is completed, the inclined guide 12 is separated from the tape. In addition, immediately before the completion of the third threading, the ring 4 is placed on the loading ring 4.
An inclined guide 18 (FIG. 8) mounted so as to be inclined with respect to the tape abuts the tape. By arranging the tilt guide 18 for forming the third tape path for recording / reproducing on the loading ring 4, the tilt guide 18 is exclusively driven.
The device can be downsized without requiring a loading mechanism.

As shown in this embodiment, the third tape path includes a plurality of roller guides 21 fixed on the chassis 3.
a, 21b (FIG. 8) and roller guides 21d, 21e, 21f, 21g provided on the movable loading ring 4.
The tension guide 23 is mainly formed (FIG. 8). Since this configuration has few movable mechanisms, it is possible to use a simple guide mechanism for highly accurate position / posture determination for recording and reproduction. In particular, in the mechanism for positioning and fixing after moving, only the loading ring 4 is the mechanism for mounting the roller guide, which is very advantageous for downsizing, cost reduction and high reliability of the apparatus. In this embodiment, the tape 2 is wound around the drum 1 by the loading ring 4, but the tape may be wound around the drum 1 by moving the base member having the inclined guide.

Further, the control of the tape winding operation on the drum 1 will be described with reference to FIGS. 13 and 15. Figure 5,
FIGS. 6, 7, and 8 are views showing the progress of the tape winding on the drum 1, and the tape winding on the drum 1 is the first.
It is performed through three stages of threading, second threading, and third threading, and after each threading operation, each tape path is formed.

The single cartridge 6 is loaded in the file reel die 24 (FIG. 4) by the cartridge loader 17 (FIG. 3).
Be attached to. Then, according to a command from the servo controller, the leader block 11 pulled out by the threader pin 22 is received, so that the machine reel 5 is positioned. The machine reel 5 positions the reader block 11 receiving port at a predetermined position by a machine reel positioning sensor 37 attached to the machine reel 5 and a machine reel encoder (not shown).

Next, in order to start the first threading by the command of the servo controller, the threader motor 14
To drive. As a result, the first threading mechanism moves the leader block 11 attached to one end of the tape 2 from the single reel cartridge 6 to the threader pin 2
The tape 2 is pulled out by 2 and conveyed to the machine reel 5, and the tape 2 is suspended between the file reel 6a and the machine reel 5 to form a first tape path (FIG. 15). During this time, according to a command from the servo controller, information is supplied to the file reel 6a from an encoder (not shown) mounted on the file reel 6a, and a load is applied in the winding direction of the tape 2 so that the tape tension is controlled to be constant. . After the completion of the first threading is detected, the servo controller issues an instruction to wind the tape amount required for the second and third threading operations onto the machine reel 5.

When winding the tape 2 on the machine reel 5,
By counting the pulses of an encoder (not shown) between both reels, the tape feed amount of the machine reel 5 is compared with the tape take-up amount of the file reel 6a,
A load is applied to the file reel die 24 (FIG. 4) in the tape winding direction so that a constant tension is applied to the tape 2,
Control tape tension. The machine reel positioning sensor 37 attached to the machine reel 5 is used to measure the tape winding amount on the machine reel 5. The machine reel positioning sensor 37 generates one pulse signal every time the machine reel 5 makes one revolution. By counting this pulse by the counter circuit, it is determined that the required tape amount has been wound around the machine reel 5. The same determination may be performed by counting the encoders attached to the machine reel motor 25.

Next, after the tape 2 is suspended between the file reel 6a and the machine reel 5, the servo controller gives a drive command to a motor for driving the second and third threading members (not shown). . The second and third threading drive motors (not shown) are commonly used, and have a mechanism for performing the third threading after the second threading. Also, the second threading is performed and the third thread is completed before the second tape path is completely formed.
You may shift to the threading operation of.

In the second threading operation, the tape 2 is pulled out while crossing the loading ring 4 by the second threading mechanism, that is, the tension arm 7 having the tension guide 23 and the tape pulling arm 10 having the tape guide 26. Form a second tape pass (FIG. 6). The tape 2 pulled out by the tape guide 26 hits the tape 2 by the rotation of the loading ring 4 by the guide 21d mounted upright on the loading ring 4. The drawer guide 26 is positioned when the drawer is completed so that the inclination direction of the guide 21d and the tape tension direction are substantially parallel to each other. During the second threading, the tape tension control of the machine reel motor 24 stores the time series data of the load torque to the machine reel motor 25 with respect to the threading elapsed time in a memory so that the tape is not damaged in advance and the threading is performed. This is done by applying load torque to the machine reel motor 25 (FIG. 4) according to time.

After the second tape path is formed, the tape pulled out on the loading ring 4 is hooked by the guide 21d installed upright on the loading ring 4, and the drum is rotated along with the rotation of the loading ring 4. The tape 2 is wound around 1 to form a third tape path capable of recording and reproducing (FIG. 8). At the time of the third threading, the tape 2 is supplied from the machine reel 5 and the tape 2 is not supplied from the file reel 6a. The tension arm 7 detects the tape tension state during the third threading and changes the back torque of the machine reel motor 25 to keep the tape tension constant during the third threading to protect the tape. There is. The tilt guide 12 is slidably in contact with the tape 2 only during the rotation of the loading ring 4 and is mounted on the tape pull-out arm 10 and is tiltable at a predetermined angle.
Thus, the tape height deviation from the roller guides 21a, 21b, 21c, 21d, 21e, 21f of the tape during the third threading is suppressed.

At the completion of the third threading, the tilt guide 12 separates from the tape. Further, immediately before the completion of the third threading, the tilt guide 18 is mounted on the loading ring 4 so as to be tilted with respect to the loading ring.
Comes into contact with the tape. By disposing the tilt guide 18 for forming the third tape path for recording / reproducing on the loading ring 4, it is possible to downsize the device without requiring a dedicated drive of the tilt guide 18 or a loading mechanism. The third threading sensor (not shown) detects the completion of the third threading, and the threading operation is completed.

The unthreading operation will be described with reference to FIGS. The servo controller gives an unthreading start command, drives the second and third threading member drive motors from the third tape pass state, and rotates the loading ring in the direction opposite to the third threading. , Remove the tape 2 from the drum 1 and wind it on the machine reel 5. The second and third unthreading operations are the reverse operations of the second and third threading operations. At the time of completion of the third threading, the inclined guide 12 mounted on the tape pull-out guide 10 separated from the tape is removed from the tape 2 even at the time of unthreading.
To prevent the tape height from deviating from the roller guides 21a, 21b, 21c, 21d, 21e, 21f of the tape during unthreading.

At the time of the third unthreading, the tape 2 is wound by the machine reel 5. Further, while the tension arm 7 detects the tape tension state during the third unthreading, the back torque of the machine reel 5 is changed to keep the tape tension constant during the third unthreading to protect the tape. ing.

After the completion of the third unthreading, the second
Unthreading operation is performed. Second not shown
The second and third threading member drive motors are driven until the unthreading completion sensor of (1) detects. During the second unthreading, the tape tension control of the machine reel motor 25 stores the time series data of the load torque to the machine reel motor 25 with respect to the threading elapsed time in a memory in advance so as not to damage the tape 2. , By applying a load torque to the machine reel motor 25 according to the threading time.

After the second unthreading completion sensor (not shown) is detected, the servo controller gives an instruction to wind the tape 2 wound on the machine reel 5 to the file reel side. Tape 2 to file reel 6a
When the tape is wound, the number of pulses of an encoder (not shown) between both reels is counted, the tape reel-out amount of the machine reel 5 is compared with the tape reel-in amount of the file reel 6a, and a constant tension is applied to the tape 2. A load is applied to the reel motor 25 in the tape winding direction to control the tape tension. The tape winding remaining amount of the machine reel 5 is obtained by counting the number of pulses of the machine reel positioning sensor 37. Tape 2 to file reel 6a until the number of tape windings on the machine reel 5 becomes 0.
To wind up.

After the number of tape windings of the machine reel 5 becomes 0, the machine reel is moved to the machine reel positioning sensor 37.
And machine reel side encoder performs machine reel positioning. After the machine reel positioning is completed, by the instruction of the first unthreading operation of the servo controller,
The first threading motor 14 is activated, the leader block 11 is removed from the machine reel 5, conveyed to the file reel 6a side, and mounted in the single reel cartridge 6. The first unthreading sensor (not shown) detects the completion of the first unthreading, and the unthreading operation is completed.

[0051]

According to the present invention, the width of the device is 8 inches (the device width is less than twice the width of the single reel cartridge), the height is 5 inches, and the effective data transfer rate is 11 MByt.
It was possible to construct a helical scan type magnetic recording / reproducing apparatus using a single reel cartridge having a performance of e / s and a data storage capacity of 20 GB or more while achieving miniaturization, cost reduction and high reliability. .

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a tape pattern on which data of the present invention is recorded.

FIG. 3 is a plan view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 4 is a side view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 5 is a plan view showing the completion of the first threading operation of the magnetic recording / reproducing apparatus in one embodiment of the present invention.

FIG. 6 is a plan view showing the completion of the second threading operation of the magnetic recording / reproducing apparatus in one embodiment of the present invention.

FIG. 7 is a plan view showing the progress of the third threading operation of the magnetic recording / reproducing apparatus in one embodiment of the present invention.

FIG. 8 is a plan view showing the completion of the third threading operation of the magnetic recording / reproducing apparatus in the embodiment of the present invention.

FIG. 9 is a perspective view of a single reel cartridge according to an embodiment of the present invention.

FIG. 10 is a configuration diagram of a magnetic drum according to an embodiment of the present invention.

FIG. 11 is a head layout diagram on the middle-stage magnetic drum in one embodiment of the present invention.

FIG. 12 is a mounting view of a single reel cartridge according to an embodiment of the present invention.

FIG. 13 is a control flow chart of a threading operation according to an embodiment of the present invention.

FIG. 14 is a control flow chart of an unthreading operation in the embodiment of the present invention.

FIG. 15 is a configuration diagram of a threading system according to an embodiment of the present invention.

[Explanation of symbols]

 1 ... drum, 3 ... chassis, 4 ... loading ring, 5 ... machine reel, 6 ... single reel cartridge, 6a ... file reel, 7 ... tension arm, 10 ... drawer arm, 11 ... Leader block, 12 ... Inclination guide, 14 ... First threading mechanism, 15 ... Threader arm, 18 ... Inclination guide, 21a, 21b, 21c, 21d ... Air guide, 21e, 21f, 21g ... Roller guide , 23 …… tension guide, 26 …… tape guide.

Claims (5)

[Claims] 1. A drum having a magnetic head for recording / reproducing on / from a magnetic tape, a file reel for detachably mounting a single reel cartridge around which the magnetic tape is wound at a first position, and a file reel supplied from the file reel. A machine reel for winding the magnetic tape, a first threading mechanism for pulling the magnetic tape from the file reel and suspending the magnetic tape on the machine reel, and pulling the magnetic tape from a suspended state on the machine reel, A second threading mechanism for enlarging the drawing area and a rotation center axis of the drum are arranged inside a rotation ring, and a guide member arranged on the rotation ring is used to measure the magnetic tape. A third threading mechanism wound around a drum, the file reel, the machine reel, the threading mechanism, A magnetic disk drive having a chassis on which a recording drum is mounted, a tape drive mechanism for driving the magnetic tape, a control circuit for the magnetic tape drive mechanism, and a circuit for exchanging signals with the outside to perform recording and reproduction on the magnetic tape. Recording / playback device. 2. The second threading mechanism has a tension arm for detecting a tension state of the tape, and a pull-out arm that does not slide on the tape during recording / reproduction and slides on and pulls out the tape only during threading. The magnetic recording / reproducing apparatus according to claim 1. 3. The magnetic recording / reproducing according to claim 2, wherein the drawer arm of the third threading mechanism is provided with a guide substantially parallel to the rotation center axis of the file reel and a guide inclined at a predetermined angle. apparatus. 4. A member of the rotating ring has a hollow portion,
The magnetic recording / reproducing apparatus according to claim 1, wherein air is passed through the guide member through the hollow portion. 5. A first step of removably mounting a single reel cartridge wound with a magnetic tape in a first position, and a second step of pulling out the magnetic tape from the single reel cartridge and suspending it on a machine reel. A step of pulling out the magnetic tape from the state of being suspended on the machine reel and enlarging the pull-out area, and a guide member arranged on the rotating ring, which makes the magnetic tape a drum. A magnetic recording / reproducing method having a fourth step of winding.