JPH08195003A - Magnetic tape device and method for threading magnetic tape - Google Patents

Abstract

PURPOSE: To miniaturize a magnetic tape device including a threading mechanism for a single reel cartridge. CONSTITUTION: A threader arm 5 and a holder arm 4 coaxially attached to an arm driving motor are disposed in a threading path extending from a single reel cartridge 1 to a winding reel 11, the threader arm 5 rotates over the entire region of the threading path and the holder arm 4 rotates from the midway of the path to the winding reel 11. By pulling out a reader block 3 fixed to the end of a magnetic tape by means of the threader pin of the threader arm 5 and fitting the recessed part 4a of the holder arm 4 around the projecting part of the reader block 3, the posture of the reader block 3 is maintained constant during threading. The posture of the reader block 3 from the single reel cartridge 1 to the holder arm 4 is controlled by a reader block guide 6 linked with the threader arm 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape device and a threading technique for a magnetic tape, and more particularly to a technique effectively applied to a magnetic tape device using a single reel cartridge as a medium.

[0002]

2. Description of the Related Art For example, in constructing a magnetic tape library or the like having a large storage capacity, a single reel cartridge which can save a space for storing a medium has been used.

Conventionally, as a threading mechanism of a magnetic recording / reproducing apparatus using a single reel cartridge as described above, for example, one having a structure disclosed in JP-A-60-10446 is known. That is, the cam track laid along the substantially arcuate magnetic tape locus from the single reel cartridge to the take-up reel has the center of rotation at the center of the substantially arcuate magnetic tape locus and has one node. By guiding the movable end of the link arm and engaging the leader block of the magnetic tape with the movable end, the threading operation is carried out by carrying the leader block from the single reel cartridge to the take-up reel. It was done like this.

As another conventional threading mechanism, for example, the one illustrated in the perspective view of FIG. 11 can be considered. In the case of the configuration of FIG. 11, the movement of the linkage arm 129 is caused by the cam track 128 engraved so as to surround the rotating shaft 117 of the reduction mechanism 127 that drives the linkage arm 129 by increasing the torque obtained from the gear 130. Regulated, cam truck 12
By rotating the linkage arm 129 around an axis arranged in the space surrounded by 8, the linkage arm 1
A leader block pin 118, which is attached to the tip of 29 and engages with the leader block, performs an operation of pulling the leader block out of the single reel cartridge, transporting it to the take-up reel, and engaging with the slot of the take-up reel. It is a thing.

[0005]

However, in the case of the former prior art, there is a problem that the area required for laying the cam track becomes large and the installation space of the magnetic tape device cannot be made small.

On the other hand, in the case of the latter prior art, the area of the rotation range of the linkage arm 129 can be made smaller than that in the former case, but the leader block is not restrained in any rotational displacement around the leader block pin 118. Depending on the direction of tape tension applied to the magnetic tape,
The posture of the leader block changes. Therefore, in order to perform tape threading in a non-contact manner with a tape guide, a fixed head, etc. arranged near the tape threading path, it is necessary to provide a sufficient width in the tape threading path to avoid the contact. Is not suitable for downsizing the mechanism of.

Further, as the linkage arm rotates, the distance between the center axis of rotation and the leader block pin 118 (this distance is referred to as the diameter difference) changes greatly, so that tape threading is performed that is not defeated by the tape tension applied when the maximum diameter difference occurs. In addition, the drive torque of the linkage arm 129 is obtained by increasing the torque via the speed reduction mechanism 127.
Therefore, the drive system of the linkage arm 129 becomes large in size, which is not suitable for downsizing the tape threading device.

Further, X3B proposed by ANSI
The single reel cartridge described in No. 5 has three types (S, M, L) having different tape lengths, and the winding diameter of the tape on the reel varies depending on the tape type. With a single reel cartridge having such various winding diameters, when inserting the leader block into the cartridge,
Since the posture of the leader block is oriented in the direction in which the tape tension is applied, in the case of the S and M types, the leader block is not inserted vertically into the leader block insertion opening of the cartridge but is oriented toward the reel side. Therefore, there is a concern that the leader block may be caught in a convex portion of the cartridge for the purpose of latching the leader block, and it may be difficult to insert the leader block into the cartridge.

An object of the present invention is to realize a miniaturization of a mechanism required for threading a single reel cartridge, and eventually a miniaturization of a magnetic tape device using the single reel cartridge as a medium.

Another object of the present invention is to reduce the size of a mechanism required for threading a single reel cartridge, and thus to reduce the size of a magnetic tape device using a single reel cartridge as a medium. To provide threading technology.

Still another object of the present invention is to accurately perform the operation of pulling out and accommodating the leader block from the single reel cartridge without being affected by the change in the length of the magnetic tape accommodated in the single reel cartridge. It is to provide a magnetic tape device capable of

Still another object of the present invention is to accurately perform the operation of pulling out and accommodating the leader block from the single reel cartridge without being affected by the change in the length of the magnetic tape accommodated in the single reel cartridge. It is to provide a threading technology of a magnetic tape capable of achieving the above.

[0013]

SUMMARY OF THE INVENTION The present invention is a magnetic tape device that uses a single reel cartridge wound with a magnetic tape having a leader block mounted on the outer end as a recording medium. The first and second arms are provided, and the threading operation of pulling out the leader block from the single reel cartridge and carrying it to the take-up reel is performed by the cooperation operation of the first and second arms. .

For example, the first arm is provided with an engaging structure for engaging with the leader block without restraining the rotational movement of the leader block within a plane including the movement locus of the leader block, and the second arm is A holding structure for holding the leader block and restraining the turning motion, holding the second arm on the movement path of the leader block in the threading operation, and pulling out the leader block from the single reel cartridge by the first arm. Second
Threading operation is performed by the first operation of fitting the arm to the holding structure of the arm and the second operation of fitting the leader block to the take-up reel by simultaneously rotating the first and second arms in the same direction. Be seen.

Further, it is possible to provide a guide member which comes into contact with the leader block conveyed from the single reel cartridge to the position of the second arm by the first arm and regulates the posture of the leader block.

[0016]

According to the present invention described above, the threading path of the leader block draws a simple arc, and the threading mechanism is a simple and compact mechanism that does not use a cam link mechanism.

Further, since the leader block is restrained by the second arm during the threading operation, the posture during the pulling operation by the first arm is regulated to a constant value.
The area required for the threading path can be minimized, and by holding the leader block, it is possible to thread the guides existing near the threading path in a non-contact manner. The tape running system of the tape device can be downsized.

Further, the posture of the leader block during the movement operation from the single reel cartridge to the second arm by the first arm is regulated to a constant value by the guide member, so that the winding length of the magnetic tape in the single reel cartridge is limited. It is possible to smoothly and accurately perform the operation of pulling out and accommodating the leader block with respect to the single reel cartridge without being affected by the size and the like.

[0019]

Embodiments of the present invention will now be described in detail with reference to the drawings.

1, FIG. 2, FIG. 3 and FIG. 4 are plan views showing an example of the configuration of a magnetic tape device according to an embodiment of the present invention in the order of operation, and FIG. 5 and FIG. It is a figure. FIG. 7 is an external perspective view showing an example of the configuration of a single reel cartridge used in the magnetic tape device of this embodiment.

The magnetic tape apparatus of this embodiment has a cassette loading section A for receiving and ejecting the single reel cartridge 1, a threading mechanism B, and an information recording / reproducing section C for recording / reproducing information on / from the magnetic tape. Is mounted on the chassis 14.

The single reel cartridge 1 used in the magnetic tape device of this embodiment has, for example, as shown in FIG. 7, an outer end portion of a magnetic tape 2 wound around a built-in file reel 1a. A leader block 3 for pulling out the magnetic tape 2 is mounted. The leader block 3 has an engaging groove 3b penetrating in a width direction of the magnetic tape 2 fixed to the leader block 3.
And the protrusions 3 projecting from the upper and lower end surfaces of the leader block 3.
a is formed.

The cassette loading section A receives and ejects the single reel cartridge 1 inserted from the front surface of the apparatus (lower side in FIG. 1). As the cassette loading section A, for example, the structure disclosed in Japanese Patent Application No. 6-149035 previously filed by the applicant of the present application can be used.

The information recording / reproducing section C includes a drum 31 having a recording magnetic head and a reproducing magnetic head (not shown) on its side surface, and a roller guide 34e in which a portion for guiding the running of the magnetic tape 2 rotates with respect to a support shaft. , A roller guide 34f, a roller guide 34g, and an air guide 34 that blows out air by providing holes in the portions for guiding the running of the tape.
a, an air guide 34b, an air guide 34c, an air guide 34h, a capstan motor 33 for driving a tape, an air guide 34d, a roller guide 34e, a roller guide 34f, and a roller guide 34g, and a drum 31 for recording / reproducing. It includes a loading ring 32 for winding the magnetic tape 2 on the magnetic tape 2, and an inclination guide 35 arranged on the loading ring 32 and inclined at a predetermined angle with respect to the plane of the loading ring 32.

Drum 31 and loading ring 32
Is arranged in a posture inclined at a predetermined angle with respect to the chassis 14, and records / reproduces information by a so-called helical scan method with respect to the magnetic tape 2 which is wound around the drum 31 and runs while being inclined. Is done.

Further, a take-up reel 1 is installed near the loading ring 32 by a threading operation as will be described later and takes up the magnetic tape 2 supplied from the file reel 1a in the single reel cartridge 1.
1 is arranged. The take-up reel 11 is driven by a take-up reel drive motor 26 via the reel hub 11a.

On the other hand, the threading mechanism B pulls out the leader block 3 attached to one end of the magnetic tape 2 wound around the file reel 1a in the single reel cartridge 1 from the inside of the single reel cartridge 1.
It is to be conveyed to the take-up reel 11.

The threading mechanism B engages with the engaging groove 3b of the leader block 3 and pulls out the magnetic tape 2 and a threader pin 18 which is thinner than the threader pin 18 and supports and drives the threader pin 18 via a rod 18a. A threader arm 5, a holder arm 4 having a concave portion 4a that engages with a convex portion 3a on an upper portion of the leader block 3, a center 24 that smoothly guides vertical movement of the vertically movable holder arm 4, a holder arm 4, and It is composed of an arm drive motor 27 that drives the threader arm 5.

The structure of the threading mechanism B will be described in more detail. Rotation shaft 17 of arm drive motor 27
The threader arm 5 is directly attached to the. The threader arm 5 is provided with a threader pin 18 and a blocking plate 5a for blocking the light detected by a photo sensor (not shown) that detects the start and completion of threading.

The holder arm 4 has an arm drive motor 27.
To the center 24 attached to the threader arm 5
It is mounted coaxially with and has a structure that can be moved up and down independently of the threader arm 5 around the center 24 as an axis. Holder arm 4 and threader arm 5
The movement is restricted by the compression torsion coil spring 23. The compression torsion coil spring 23 is always shown in FIGS.
As shown in FIG. 4, a twisting force is applied in a direction in which the holder arm 4 and the threader arm 5 are engaged with each other. The compression torsion coil spring 23 pushes the holder arm 4 downward. Center 24 attached to arm drive motor 27
Has a step 24a, and this step 24a serves as a downward stopper of the holder arm 4.

As illustrated in FIG. 6, the holder arm 4
A slide ball 25 is attached to the lower surface of the. On the plate 9 supported on the end surface of the arm drive motor 27, an inclined cam member 10 (separation mechanism) having an inclined cam surface 10a attached to the turning end of the holder arm 4 on the take-up reel 11 side is arranged. ing. The inclined cam member 10 is provided at the turning end on the take-up reel 11 side.
When the holder arm 4 rides on the slide ball 25, the holder arm 4 follows the inclined surface of the inclined cam surface 10a and slides upward (the direction in which the concave portion 4a is separated from the convex portion 3a of the leader block 3).

A leader block guide 6 (guide member) that rotates about a guide shaft 20 is provided on the chassis 14 within the turning range of the threader arm 5, and a spring pin 22 has one end engaged with the spring. It is always urged by 7 to rotate in the counterclockwise direction. A push pin 19 is provided so as to protrude from a lower portion of the threader arm 5, and the leader block guide 6 is rotated in association with the threader arm 5 when the push pin 19 abuts when the threader arm 5 is rotated. Is to be done. That is, the contact surface of the push pin 19 in the leader block guide 6 forms the end surface cam 6a.

The operation of the threading mechanism B will be described with reference to FIGS. 1, 2, 3, and 4.

FIG. 1 shows the threading state before the threading is started when the single reel cartridge 1 is mounted on the magnetic tape device, and FIGS.
FIG. 4 shows a state in the middle of threading, and FIG. 4 shows a state when threading is completed.

[Threading] Arm drive motor 27
The threader pin 18 of the threader arm 5 directly attached to the rotation shaft of the above engages with the engagement groove 3b formed in the leader block 3 in the single reel cartridge 1 when the device mounting of the single reel cartridge 1 is completed. This engaging operation is performed by an operation in which the single reel cartridge 1 is at the height of the rod 18a supporting the threader pin 18, the rod 18a enters the engaging groove 3b, and in that state, descends to the height of the threader pin 18. . At this time, the rotation operation of the holder arm 4 that engages with the convex portion 3a formed on the upper portion of the leader block 3 is restricted by the stopper pin 8 so that the holder arm 4 cannot rotate toward the single reel cartridge 1 side by a predetermined angle or more. Therefore, the threader arm 5 is on standby on the turning path.

Along with the rotation of the threader arm 5, the push pin 19 attached to the threader arm 5 pushes the rotatable leader block guide 6 against the guide shaft 20 to rotate the leader block 3. The leader block guide 6 that rotates around the guide shaft 20 in conjunction with the threader arm 5 contacts the side surface of the leader block 3 pulled out by the threader arm 5, and the holder arm 4
Change the posture direction of the leader block 3 up to. At this time, the magnetic tape 2 attached to the leader block 3 is given back tension from the file reel 1a on the cartridge side, and the posture of the leader block 3 is restricted by the tension applied to the magnetic tape 2 and the abutment of the leader block. To be done. Further, the surface of the leader block guide 6 with which the push pin 19 abuts has the end surface cam 6 as described above.
a, and the posture of the leader block 3 during threading can be changed to a desired state by changing the shape of the end surface cam 6a or the shape of the contact surface between the leader block guide 6 and the leader block 3. .

The attitude of the leader block 3 during threading changes depending on the tape winding diameter of the file reel 1a in the single reel cartridge 1. The single reel cartridge 1 proposed in the ANSI standard X3B5 used in this embodiment is a tape type S,
There are three types, M and L, and the winding diameters of the magnetic tape 2 around the file reel 1a are different. Therefore, in order to smoothly insert the convex portion 3a of the leader block 3 into the concave portion 4a of the holder arm 4, it is necessary to control the posture of the leader block 3 up to the insertion into the holder arm 4. In the present embodiment, the tape reel diameter of the file reel 1a is controlled by bringing the leader block guide 6 into contact with the leader block 3 to control the posture while applying back tension from the file reel 1a on the single reel cartridge 1 side. Stable threading that does not depend on is possible.

The leader block guide 6 includes spring pins 22.
When the push pin 19 of the threader arm 5 is not in contact with the leader block guide 6, it is urged toward the posture of the leader block 3 by the spring 7 attached by Has no effect. Further, after the holder arm 4 and the threader arm 5 are engaged with each other by the rotation of the threader arm 5, the concave portion 4a of the holder arm 4 and the leader block 3 are
The convex portion 3a at the upper end of is engaged, and the holder arm 4 holds the posture of the leader block 3 from above as shown in FIG. The leader block 3 is the threader pin 1 of the threader arm 5.
The holder arm 4 which is in a state of being hooked on the center 8 and is vertically movable about the center is pressed downward by the compression torsion coil spring 23.
With the holder arm 4, the leader block 3 is sandwiched and held in the vertical direction.

As in the conventional case, when the posture of the leader block 3 is free during the threading, in order to prevent the leader block 3 from abutting against the guides arranged in the traveling system, the threading is performed. An extra area for the movable range of the leader block 3 is required along the locus, which makes it difficult to reduce the size.

On the other hand, in the case of this embodiment, the area required for threading by holding the leader block 3 by the holder arm 4 and controlling the posture thereof rotates the leader block 3 in an arc shape. It is the minimum area when it is made to be suitable for miniaturization. further,
It does not damage the running parts. Along with the rotation, the magnetic tape 2 fixed to the leader block 3 is moved to the tension arm 15 inside the threading locus.
Threading is performed while being wound around the upper guide 15a, the guide 13a of the tape pull-out arm 13, the guide 16 on the chassis 14, and the guide shaft 20 of the leader block guide 6.

The reel hub 11a of the take-up reel 11 is positioned in the insertion direction of the leader block 3 by reel servo control in preparation for the insertion of the leader block 3. The slide member 12 is movable in the radial direction of the reel hub 11a, and is restricted outward by a spring 21 incorporated therein before the leader block 3 enters, but is pushed toward the center by the leader block 3 entering. When the threading is completed, the reel hub 11a and the slide member 1 are
2 sandwiches the leader block 3. The tip portion 3c of the leader block 3 has the same radius of curvature as the holding groove 11b of the reel hub 11a, and becomes a winding core of the winding reel when sandwiched between the reel hub 11a and the slide member 12.

As shown in the sectional view of the threader mechanism at the completion of threading in FIG. 6, the holder arm 4 is
Slides upward as the slide ball 25 rides on the inclined cam surface 10a of the inclined cam member 10 as the leader block 3 enters the reel hub 11a, and releases the leader block 3. Threader pin 18
Is located at the center of the take-up reel 11, and the leader block 3
Since there is play in the engagement with the engagement groove 3b, the take-up reel 11 can smoothly rotate with the threader pin 18 still fitted in the engagement groove 3b.

[Unthreading] The unthreading operation is the reverse operation of the threading operation. With the rotation of the threader arm 5, the holder arm 4 descends along the inclined cam surface 10a of the inclined cam member 10, and the concave portion 4a is fitted to the convex portion 3a of the leader block 3 again to move the leader block 3 upward. Hold more. During unthreading, the holder arm 4 holds it from above and back tension is applied to the reel on the cartridge side to eliminate wobbling between the concave portion 4a of the holder arm 4 and the convex portion 3a of the leader block 3 due to backlash. Maintain a constant posture.

After rotating by a predetermined angle in the direction approaching the single reel cartridge 1, the holder arm 4 is stopped from rotating by the stopper pin 8 attached to the plate 9, and only the threader arm 5 continues to rotate. When the leader block 3 is inserted into the single reel cartridge 1, the posture of the leader block 3 is oriented in the direction in which the tape tension is applied with the threader pin 18 as the center. The cartridge 1 is not inserted vertically into the leader block insertion opening, but faces the file reel 1a side. Therefore, the leader block 3 is caught by the convex portion of the latch member 1b of the leader block 3 in the single reel cartridge 1, and it becomes difficult to insert the leader block 3 into the single reel cartridge 1.

On the other hand, in the case of this embodiment, the posture of the leader block 3 during unthreading operation is controlled by the leader block guide 6 which gives a rotational force by the push pin 19 attached to the threader arm 5. , Is inserted perpendicularly to the leader block insertion opening 1c of the single reel cartridge 1. Since the reel back tension is given even during unthreading, the posture of the leader block 3 can be stably unthreaded every time. The leader block 3 is inserted into the single reel cartridge 1 and the unthreading is completed.

[Loading and Unloading of Magnetic Tape] FIGS. 8, 9 and 10 show the magnetic tape 2.
FIG. 6 is a plan view sequentially showing loading (winding operation) and unloading (winding operation) on the drum 31 of FIG.

The loading of the magnetic tape 2 onto the drum 31 is performed subsequent to the above-mentioned threading operation.

That is, after the above-described threading is completed, the magnetic tape 2 is pulled out from the single reel cartridge 1 and loaded by the expanding operation of the tension arm 15 and the tape pull-out arm 13, as shown in FIG. It is stretched across the upper part of the ring 32, and by rotating the loading ring 32 counterclockwise in this state, the air guide 34d on the loading ring 32 is engaged with the magnetic tape 2 as shown in FIG. Then, the operation of winding the magnetic tape 2 around the drum 31 is started. At this time, an appropriate back tension is applied to the magnetic tape 2 from the file reel 1a of the single reel cartridge 1. As the loading ring 32 continues to rotate,
As illustrated in 0, the winding operation of the magnetic tape 2 around the drum 31 is completed.

Thereafter, while the magnetic tape 2 is pulled out from the single reel cartridge 1 and wound by the take-up reel 11, the magnetic head on the drum 31 performs the recording / reproducing operation of desired information.

The unloading of the magnetic tape 2 from the drum 31 is performed prior to the above-mentioned unthreading. That is, the unloading of the magnetic tape 2 is
After rewinding the magnetic tape 2 wound on the take-up reel 11 from the single reel cartridge 1 for the recording or reproducing operation to the inner side of the single reel cartridge 1, the loading ring 32 is rotated clockwise. It is performed by releasing the winding state of the magnetic tape 2 around the drum 31. After this unloading
The aforementioned unthreading in which the leader block 3 is removed from the take-up reel 11 and retracted to the single reel cartridge 1 is executed.

According to the present embodiment described above, the cooperative operation of the coaxial holder arm 4 and the threader arm 5 realizes a small and stable threading mechanism for performing a stable threading operation, thereby realizing the miniaturization of the magnetic tape device. Is possible. Further, the single reel cartridge 1 is not affected by the change in the length of the magnetic tape 2 stored in the single reel cartridge 1, that is, the change in the winding diameter of the magnetic tape in the file reel 1a.
The leader block 3 can be pulled out and stored in the container accurately.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the embodiments and various modifications can be made without departing from the scope of the invention. Needless to say.

[0053]

According to the magnetic tape device of the present invention, it is possible to reduce the size of the mechanism required for threading a single reel cartridge, and thus to reduce the size of a magnetic tape device that uses a single reel cartridge as a medium. Is obtained.

According to the magnetic tape device of the present invention,
The effect that the leader block can be pulled out from and stored in the single reel cartridge accurately without being affected by the change in the length of the magnetic tape stored in the single reel cartridge.

According to the threading method for a magnetic tape of the present invention, the mechanism required for threading a single reel cartridge can be downsized, and thus the magnetic tape device using the single reel cartridge as a medium can be downsized. Is obtained.

Further, according to the magnetic tape threading method of the present invention, the leader block can be pulled out from the single reel cartridge and accommodated therein without being affected by the change in the length of the magnetic tape accommodated in the single reel cartridge. It is possible to obtain the effect that it can be performed accurately.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of the configuration of a magnetic tape device according to an embodiment of the present invention in the order of operation.

FIG. 2 is a plan view showing an example of the configuration of a magnetic tape device that is an embodiment of the present invention in the order of operation.

FIG. 3 is a plan view showing an example of the configuration of a magnetic tape device that is an embodiment of the present invention in the order of operation.

FIG. 4 is a plan view showing an example of the configuration of a magnetic tape device that is an embodiment of the present invention in the order of operation.

FIG. 5 is a sectional view showing a part of a magnetic tape device according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a part of a magnetic tape device according to an embodiment of the present invention.

FIG. 7 is an external perspective view showing an example of the configuration of a single reel cartridge used in the magnetic tape device according to the embodiment of the present invention.

FIG. 8 is a plan view showing, in the order of operation, an example of the operation of the magnetic tape device according to the embodiment of the present invention.

FIG. 9 is a plan view showing an example of the operation of the magnetic tape device according to the embodiment of the present invention in the order of operation.

FIG. 10 is a plan view showing an example of the operation of the magnetic tape device according to the embodiment of the present invention in the order of operation.

FIG. 11 is a perspective view showing an example of a threading mechanism in a conventional magnetic tape device.

[Explanation of symbols]

1 ... Single reel cartridge, 2 ... Magnetic tape, 3 ... Leader block, 4 ... Holder arm (second arm), 5 ... Threader arm (first arm), ... -Leader block guide, 11 ... Take-up reel, A ... Cassette loading section, B ...
Threading mechanism, C ... Information recording / reproducing unit.

Claims (5)

[Claims] 1. A magnetic tape device that uses, as a recording medium, a single-reel cartridge in which a magnetic tape having a leader block attached to an outer end portion is used as a recording medium. At least two first and second magnetic tape devices have the same center of rotation. With the arm of, by the cooperative operation of the first and second arms,
A magnetic tape device characterized by performing a threading operation of pulling out the leader block from the single reel cartridge and carrying it to a take-up reel. 2. The first arm comprises an engagement structure that engages with the leader block without restraining a rotational movement of the leader block within a plane including a movement locus of the leader block. The second arm includes a holding structure that holds the leader block and restrains the rotation operation, and causes the second arm to stand by on the movement path of the leader block in the threading operation, and the first arm. A first operation of pulling out the leader block from the single reel cartridge and fitting the leader block into the holding structure of the second arm;
2. The magnetic tape device according to claim 1, wherein the threading operation is performed by a second operation of fitting the leader block to the take-up reel by simultaneously rotating the second arm in the same direction. . 3. A guide member is provided, which abuts on the leader block conveyed from the single reel cartridge to the standby position of the second arm by the first arm and regulates the posture of the leader block. The magnetic tape device according to claim 2, which is characterized in that. 4. The turning arm of the second arm on the take-up reel side intersects the second arm with a plane including the movement locus of the leader block with respect to the first arm. 3. The magnetic tape device according to claim 1, further comprising: a detaching mechanism that detaches the second arm from the leader block by independently moving the second arm in the direction. 5. A threading method for a magnetic tape in a magnetic tape device, wherein a single reel cartridge, around which a magnetic tape having a leader block mounted on an outer end portion is wound, is used as a recording medium. A method of threading a magnetic tape, characterized in that the leader block is pulled out of the single reel cartridge and conveyed to a take-up reel by a cooperative operation of two first and second arms.