JPS6338473Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a magnetic tape cartridge.
The purpose is to prevent the magnetic tape from loosening at the front of the case due to rattling of the tape reel.

When a video magnetic tape cartridge is loaded into a video deck, the magnetic tape led out to the front of the main case is pulled out to the front of the case and wound around the rotating head on the video deck side. There is a recessed pocket on the front for the tape loading pin. Generally, a reel brake means is installed inside the main body case to prevent the tape reel from spinning idle and the magnetic tape coming out to the front of the case when not in use. Currently, there is a slight play in the reel, and it is not possible to sufficiently prevent the magnetic tape from coming loose at the front of the case. A particular problem arises when a loose magnetic tape from the front of the case gets inside the pocket where the tape loading pin is inserted. In such a case, the tape loading pin, which should be inside the magnetic tape, ends up outside, making it impossible to pull the magnetic tape forward.

Therefore, it was proposed in 1985 that a mechanism for applying tension to the magnetic tape be provided in the middle of the magnetic tape running system within the main body case, thereby preventing the magnetic tape from becoming loose at the front of the main body case.
It is publicly known from the publication No.-80724. In this case, an intermediate tape guide member is arranged between the tape reel and the main tape guide member located in front of the tape reel within the main body case, and a rotating arm is horizontally disposed near the intermediate tape guide member around a pivot axis. A tape tension member is integrally provided on the tip side of the rotating arm, and a spring member biases the rotating arm to rotate in one direction, so that the tape tension member becomes magnetic. It is designed to act in contact so as to apply tension to the tape.

However, in this conventional example, the rotary arm is rotatably supported on a pivot provided at a position apart from the intermediate tape guide member. Therefore, it is unreasonable to support the movable arm, including the intermediate tape guide member and tape tension member, at separate locations within a limited space, resulting in poor assembly workability and a disadvantage of lacking operational reliability. It was hot. Furthermore, the provision of the above-mentioned pivot leads to a complicated structure. The present invention was proposed in order to eliminate such conventional drawbacks, and allows the tape tension mechanism to be incorporated into the narrow space within the main body case with sufficient design allowance, thereby improving the workability of assembling the mechanism. , and to ensure reliability of operation.

An object of the present invention is to provide a magnetic tape cartridge equipped with a tape tension mechanism that contributes to simplifying the structure and reducing manufacturing costs.

That is, in order to achieve the above object, the magnetic tape cartridge of the present invention has a projecting structure on the inner surface of the main body case between at least one tape reel on the left and right and the main tape guide member located in front of the tape reel. An intermediate tape guide member is disposed through a boss, a rotary arm is horizontally rotatably supported on the boss, and a tape tension member is provided on the rotary arm to horizontally rotate around the intermediate tape guide member. , comprising a means for rotationally biasing the tape tension member in one direction, and winding a magnetic tape around the outer peripheral surfaces of the intermediate tape guide member and the tape tension member in an S-shape in plan view;
The magnetic tape is characterized in that tension is applied to the magnetic tape by a rotationally biased tape tension member.

The details will be explained below based on the drawings.

1 to 12 show a first embodiment of a video magnetic tape cartridge according to the present invention.

In FIGS. 1 and 2, 1 is a main body case in which upper and lower cases 2 and 3 made of plastic or the like are screwed together in a lid-like manner, and a tape reel on which a magnetic tape 4 is wound is wound on the left and right inside of the main body case 1. The main tape guide members 7 and 8 are arranged and fixed at the left and right corners of the front of the main body case 1. In such a case, the magnetic tape 4 is guided by the main tape guide members 7 and 8, led out from the supply tape reel 5 on the right side of the drawing to the front of the case, and then wound onto the take-up tape reel 6 on the left side.

Reference numeral 9 designates a pocket for inserting a tape loading pin, which is formed in the front surface of the main body case 1 by cutting out the lower case 3 and recessed therein. This pocket 9 is formed large in the center of the front surface of the main body case 1, and its upper surface is covered by the upper case 2 and its front and lower surfaces are open. The interior of the main body case 1 and the pocket 9 are partitioned by ribs 10 that protrude from the upper and lower cases 2 and 3 at the periphery of the pocket 9 and abut against each other.

Lamp insertion holes 12, 12 are provided in the front left and right corners of the main body case 1 at positions closer to the rear of the case and closer to the center of the case than the main tape guide members 7, 8, respectively, for inserting a magnetic tape cartridge into a video deck. When the tape end detection lamp on the video deck side enters the case through each insertion hole 12, the light from each lamp passes through the transparent leader tape connected to both ends of the magnetic tape 4. There are transparent holes 1 in the left and right side walls of the main body case 1.
3 and reaches a sensor 14 on the video deck side, which detects the beginning and end of the magnetic tape 4. Reference numeral 15 designates a light-shielding wall 15 that stands up from the periphery of each lamp insertion hole 12 on the inner surface 3a of the lower case 3. This light-shielding wall 15 blocks external light from a transparent window 16 provided on the upper case 2 for visualizing the amount of tape wound. is blocking the sensor light path.

17 is a front cover for protecting the tape. This front lid 1
Reference numeral 7 denotes a front plate 18 that covers the front surface of the main body case 1 from left to right, a top wall 19 extending inward from the upper end of the front plate 18, and a top wall 19 extending inward from the left and right ends of the front plate 18. Left and right side pieces taken out 20, 20
and pivot shafts 21, 21 protruding from the inner surfaces of the left and right side pieces 20, 20 in an opposing manner.
The pivot 2 is attached to the front end recessed portions 22, 22 of the left and right side walls of the
The shafts 21 and 2 are externally fitted and supported via the shafts 1 and 21.
1 as a pivot point, the front plate 18 can be freely switched between a posture in which the front surface of the case is closed and a posture in which it is rotated upward and opened. After that, when not in use, the front lid 1
A spring member 24 for elastically biasing the front cover 7 to the closed position and a lock mechanism 25 for locking the front cover 17 to the closed position are provided.

As the spring member 24, for example, as shown in FIG.
The other end is inserted into the upper case and locked into the upper wall 19 of the upper case.

The closing lock mechanism 25 of the front lid 17 is connected to the main body case 1.
It is located in front of the pocket 9 at a position to the left where it does not interfere with the pocket 9. 5 to 9 show specific examples of this closing lock mechanism 25, in which a cutout window 26 is provided on the front edge of the upper case 2 on the main body case 1 side, and a cutout window 26 is provided on the front edge of the lower case 2. A lock release hole 27 is transparently provided in the lock release hole 27, and a support shaft 28 is installed vertically and integrally from the lower case inner surface 3a at a position close to the hole 27 on the right side in the figure, and the above-mentioned notch window is formed from the upper surface wall 19 on the front lid 17 side. The locking piece 29 that is fitted into the housing 26 and extends into the main body case is horizontally extended. This locking piece 29 extends horizontally from the top wall 19 of the front cover 17 so as not to interfere with the inner surface 2a of the upper case when the front cover 17 is closed, and its extending end 29a extends horizontally. The length is set to reach the inner side of the case than the rotation axis 21. Then, the proximal end boss portion 30a of the locking tool 30 is fitted onto the support shaft 28 from above so as to be horizontally rotatable.
a and the lower end of the distal end portion 30b are received and supported on the inner surface of the lower case, and the intermediate loop portion 31a of the spring member 31 made of a coil spring is fitted into the upper end small diameter portion of the proximal end boss portion 30a of the locking tool 30, and the spring One end 31b of the member 31 is locked to the top end side of the locking tool 30, and the other end 31c is locked to the play restriction rib 36 of the tape reel 6, and the spring member 31 locks the locking tool 30 at the front. Apply pressure to the position. When the locking tool 30 is in the locked position, the inclined surface 32 formed on the lower front surface of the intermediate portion 30c is located almost directly above the lock release hole 27, and the tip portion 30c is located almost directly above the lock release hole 27.
The upper surface of b is closely opposed to the lower surface of the extending end 29a of the locking piece 29 extending from the front lid 17 with a slight gap therebetween. In addition, a stopper 33 is provided on the inner surface 3a of the lower case 3 so as to protrude from the lower end of the front side of the tip 30b of the locking tool 30.
The locking tool 3 is pressed and biased by the spring member 31.
The contact is regulated so that 0 is in the lock position.
Further, the rib 10 erected on the periphery of the pocket 9
The upper surface of the portion located below the locking piece 29 is formed into a stepped shape, and a cutout 35 is provided on the inner surface of the stepped surface 34, so that the front cover 17 is locked when the front cover 17 is completely opened upward. The piece 29 is designed not to interfere with the rib 10.

In this case, when the magnetic tape cartridge is not in use, the locking member 30 is elastically biased by the spring member 31 to the locked position shown by the solid line in FIG. Even when the locking piece 29 is moved, the extending end 29a of the locking piece 29 is locked against the locking tool 3.
It touches the upper surface of the tip of 0 and does not open. Therefore,
The front cover 17 is locked in the closed position, and the magnetic tape 4 led out to the front of the case is well protected by the front plate 18. On the other hand, when the magnetic tape cartridge is loaded into the video deck, the pusher 37 on the video deck side rushes into the case through the lock release hole 27, and the tip of the pusher 37 locks into the locking tool 30.
The locking member 30 comes into contact with the inclined surface 32 of the intermediate portion 30c of the spring member 31 as shown in FIG.
The top surface of the tip of the locking tool 30 is oscillated to the rear unlocked position against the
a, that is, out of the rotational trajectory, and the front cover 9 is in a state where it can be opened upward. As the magnetic tape cartridge is pushed down from this state, the fixing lever on the video deck side comes into contact with the lower end of the front plate 18 of the front cover 17, causing the front cover 17 to move upward against the spring member 24. Open to. Next, the tape loading pin 39 on the video deck side enters the pocket 9 from above and pulls out the magnetic tape 4 toward the front of the case.

Incidentally, the inclined surface 32 provided on the intermediate portion 30c of the locking tool 30 is not necessarily required, and the pusher 37 may be wedge-shaped between the lower edge of the intermediate portion 30c and the periphery of the lock release hole 27. The locking device 30 may also be pushed into the unlocked position. The locking device 30 itself can also be configured to move linearly.

In addition, in FIG. 3, a breakable accidental erasure prevention piece 40 is provided at the rear central portion of the lower case 3, and the magnetic tape cartridge is reversed in the vertical and front-back directions at the left and right central portions of the front of the main body case 1. A recess 41 is provided on the bottom surface of the lower case 3 to prevent mistakes when loading the video deck.
Notches 42 are formed at the lower end of the front wall 18 of the front cover 17, so that when the magnetic tape cartridge is correctly loaded, the erroneous loading prevention member on the video deck side fits into these notches 42 and the recess 41. There is.

Each of the tape reels 5 and 6 described above has flanges 46 and 47 on the upper and lower sides of the hub 45, and the lower flange 4
It is a plastic molded product in which engaging teeth 48 are continuously formed on the outer periphery of the upper case 7, and is pressed toward the lower case side by a reel pressing spring 49 fixed to the inner surface of the upper case.

At the rear left and right corners of the main body case, there is a reel brake means 5 that acts on both tape reels 5 and 6.
0,50 are incorporated. As shown in FIG. 2, the reel brake means 50 includes a support shaft 51 erected at the corresponding part of the lower case 3, a through hole 52 provided near the support shaft 51, and a separate brake. The base end boss portion of the piece 53 is fitted onto the support shaft 51 from above so as to be horizontally rotatable, and the brake piece 53 is rotatably biased to the lock position by the spring member 54, and when the brake piece 53 is in the lock position, the brake is activated. The middle portion of the piece 53 straddles the through hole 52, and the tip of the brake piece 53 engages with the engaging tooth 48 of each tape reel. In this case, when the magnetic tape cartridge is not in use, each tape reel 5, 6 is prevented from rotating, and when the magnetic tape cartridge is loaded into a video deck, the pusher (not shown) on the video deck side is inserted into the case through each through hole 52. The end of the brake piece 53 comes into contact with the middle part of the brake piece 53 and is pushed to the unlocked position against the spring member 54, so that the tip of the brake piece 53 touches the engaging tooth 48 of each tape reel. When the tape reels 5 and 6 are removed from each other, the tape reels 5 and 6 are free to rotate.

Now, in FIGS. 10 to 12, a mechanism 60 for applying tension to the magnetic tape 4 is provided between the supply tape reel 5 and the main tape guide member 7 located in front of it.

As for the tape tension mechanism 60, first, a circular boss 61 is provided on the inner surface 3a of the lower case 3 protruding from the right lateral outer side position closer to the rear of the case than the lamp insertion hole 12, and a metal pin 62 is set on the boss 61. An intermediate tape guide member 63 made of a plastic guide tube is fitted onto the pin 62. However, the verticality of the pin 62 is maintained by inserting the lower end into the hole 64 of the boss 61 and then fitting the upper end into the engagement hole 65 of the inner surface 2a of the upper case. This pin 62
may be integrally erected from the inner surface 3a of the lower case. Further, the intermediate tape guide member 63 is clamped and fixed between the upper end surface of the boss 61 and the protruding end surface of the inner surface 2a of the upper case.

Next, a plastic rotating arm 68 having a fitting hole 66 at its base end and a vertical shaft 67 integrally erected on the upper surface of its tip is prepared, and the base end of this rotating arm 68 is fitted. A tape tension member 6 is rotatably fitted to the outer periphery of the boss 61 through a hole 66 and is mounted on the vertical shaft 67, which is made of a plastic guide tube.
9 can be freely rotated. The tape tension member 69 is located on the rear side of the case than the boss 61, and the intermediate tape guide member 63 is placed around the boss 61.
horizontally rotatable between the left lateral outer side and the right lateral outer side. However, the base end of the rotating arm 68 is prevented from coming off upward by the lower end surface of the intermediate tape guide member 63, and the upper end of the vertical shaft 67 of the rotating arm 68 is placed along the rotation trajectory of the upper case. It loosely fits into the groove 70 provided on the inner surface 2a, thereby preventing the vertical shaft 67 from steadying and maintaining verticality.

After that, a spring member 72 made of a coil spring is
is prepared, and the intermediate loop portion 72a of the spring member 72 is
Attach the lower case 3 and the rotating arm 68 to the outer periphery of the boss 61.
One end 72b of the spring member 72 is positioned in front of the boss 61, and the spring receiving protrusion 7 protrudes from the inner surface 3a of the lower case.
3, and the other end 72c is locked to a spring receiver 74 protruding from the bottom surface of the tip of the rotating arm 68, and the spring member 72 is used to tighten the tape tension member 69.
is elastically biased to rotate in the direction of arrow P shown in FIG. 10, that is, clockwise. However, a concave groove 75 in which the spring receiving part 74 of the rotating arm 68 is fitted and moves is provided in the inner surface 3a of the lower case so as to follow the locus of movement of the spring receiving part 74, and the spring member 72 is moved downwardly. A groove 76 to be accommodated under the inner surface of the case 3 is recessed in the lower case inner surface 3a. Further, the spring receiving portion 74 is connected to the terminal edge 7 of the concave groove 75.
5a, the maximum limit of clockwise rotation of the tape tension member 69 about the boss 61 is restricted to a point where the member 69 is located just outside the intermediate tape guide member 63 to the right. The maximum limit of counterclockwise rotation of the tape tension member 69 against the spring member 72 is regulated by the contact of the spring receiver 74 with one starting edge 75b of the groove 75, or by the rotation of the rotation arm 68. The distal end portion may be brought into contact with the circumferential light wall 15 of the lamp insertion hole 12, and may be appropriately regulated as necessary.

Then, the magnetic tape 4 fed out from the tape reel 5 on the supply side is applied to the tape tension member 69 and then to each circular outer peripheral surface of the intermediate tape guide member 63.
The tape is wound in order to form an S-shape when viewed from above, and then wrapped around the main tape guide member 7 in the front.

In such a case, the tape tension member 69
Since it is rotated about the boss 61 in the direction of arrow P, that is, in the clockwise direction, by receiving the elastic force of the spring member 72, it is rotated to the right side of the intermediate tape guide member 63, as shown by the solid line in FIG. It always tries to return to a position lined up on the outside. What should be noted here is that
The magnetic tape 4 is wound in an S-shape approximately perpendicular to the intermediate tape guide member 63 and tape tension member 69 with respect to the tape feeding direction between the supply tape reel 5 and the main tape guide member 7. Since it is energized, it is most effective in always applying tension to the magnetic tape 4 regardless of the amount of tape wound on the supply tape reel 5.

Therefore, when a magnetic tape cartridge is loaded into a video deck and the magnetic tape 4 is being run, the tension applied to the magnetic tape 4 causes the tape tension member 69 to move against the spring member as shown by the imaginary line in FIG. The magnetic tape 4 rotates in the direction opposite to the direction of arrow P (counterclockwise direction) against the elastic force of the tape 72, and the magnetic tape 4 is wound in an S-shape almost parallel to the original tape feeding direction. becomes magnetic tape 4
Gives a moderate back tension to.

However, if the tape running system is loosened due to rattling of the tape reels 5 and 6 when the tape running is stopped, for example when not in use, the tape tension member 69 is
From the state shown by the imaginary line in the figure, it rotates in the direction of arrow P until it reaches the state shown by the solid line, which takes up the slack in the tape running system. Therefore, the left and right main tape guide members 7,
The magnetic tape part 8 stretched between the two is always maintained in a tensioned state, and the magnetic tape 4 can be prevented from loosening and entering the inside of the pocket 9, and the tape loading pin 3 on the video deck side
9 is surely inserted inside the magnetic tape 4. Further, the tape tension mechanism 60 is connected to the lamp insertion hole 1.
2, so that the light from the lamp inserted into the insertion hole 12 is irradiated close to the magnetic tape 4 which is always under tension between the main tape guide member 7 and the intermediate tape guide member 63. As a result, tape end detection has become better.

Although the main tape guide member 7 and the intermediate tape guide member 63 are fixed, they may be freely supported, or the tape tension member 69 may be a fixed guide.

FIG. 13 shows a second embodiment of the present invention,
In this case, the tape tension member 69 is rotated and biased by the spring member 72 in the counterclockwise direction opposite to the direction of arrow P in the same arrangement as in the first embodiment, and the magnetic tape 4 is rotated to the intermediate tape. Guide member 6
3 and the tape tension member 69. Furthermore, the spring member 72 is a tension spring. In any of the embodiments, the spring member 72 can be a spiral spring, a tension spring, or the like as appropriate.

FIG. 14 shows a third embodiment of the present invention,
In this case, the tape tension member 69 is supported horizontally rotatably in the left and right directions on the front side of the intermediate tape guide member 63, and is urged to rotate in one direction of the left and right, in the counterclockwise direction in the figure, by a spring member 72. It's summery.

15 and 16 show a fourth embodiment of the present invention, in which the pivot arm 68 in each of the previously described embodiments is constituted by a linear spring member 72. That is, the intermediate loop portion 72a of the linear spring member 72 is fitted onto the outer periphery of the boss 61, and one end portion 72b extending from the intermediate loop portion 72a is locked to the spring receiving protrusion 73 on the inner surface of the lower case 3a as in the above embodiment. Then, the other end extending from the intermediate loop portion 72a is extended horizontally to form a rotating arm 68, and the vertical end 72c is vertically raised from the extending end of the rotating arm 68, and this vertical end The tape tension member 69 is fitted to 72c. The tape tension member 69 is horizontally rotatably supported around the boss 61 by the unwinding force of the spring member 72 itself, and is biased to rotate in the direction of imparting tension to the magnetic tape 4. There is. In this case, it is particularly desirable that the upper end of the tape tension member 69 be loosely guided and fitted into the groove 70 on the inner surface 2a of the upper case.

FIG. 17 shows a fifth embodiment of the present invention,
This case is basically the same as that of the fourth embodiment, but the vertical end 72c of the spring member 72 directly forms the tape tension member 69,
The magnetic tape 4 is directly wound around this.

The tape tension mechanism 60 also includes a take-up tape reel 6 and a main tape guide member 8 in front of the tape reel 6.
Needless to say, the tape tension mechanism 60 may be provided between the tape tension mechanism 60 and the tape tension mechanism 60 may be provided between the tape tension mechanism 60 and the tape tension mechanism 60.

As explained above, according to this invention, the intermediate tape guide member 63 is erected between one of the left and right tape reels 5 and the main tape guide member 7 located in front of the tape reel 5, and 6
Tape tension member 6 horizontally rotating around 3
9, and the magnetic tape 4 is connected to the intermediate tape guide member 63 and tape tension member 69.
The magnetic tape 4 is wound in a letter-shaped manner, and in this tape-wrapped state, the tape tension member 69 is urged to rotate in a direction in which it imparts tension to the magnetic tape 4.
Therefore, the tape tension member 69 can effectively and reliably prevent tape slack in the tape running system, and the magnetic tape 4 can always be maintained in a well-tensioned state at the front of the case, thereby reliably preventing tape loading errors. .

In particular, in the present invention, the intermediate tape guide member 63 is inserted through the boss 61 protruding from the inner surface of the main body case 1.
A rotary arm 68 equipped with a tape tension member 69 is supported on this boss 61 so as to be horizontally rotatable.
is horizontally rotated around the intermediate tape guide member 63. Therefore, unlike the above-mentioned conventional embodiment in which the rotating arm 68 is supported by a pivot other than the boss 61, the intermediate tape guide member 63 and the tape tension member 69 share the same boss 61. Since it is supported, the structure can be simplified in this respect. Furthermore, the tape tension member 69 is configured to rotate around the intermediate tape guide member 63 via the boss 61 even within a limited space within the main body case 1, so that the tape tension member 69 can rotate around the intermediate tape guide member 63. It can be placed without contacting and interfering with 63, ensuring reliable operation.
Furthermore, since the rotating arm 68 and the intermediate tape guide member 63 need only be supported by the same boss 61, the ease of assembly can be improved.

[Brief explanation of drawings]

FIG. 1 is an external perspective view illustrating a magnetic tape cartridge according to the present invention, FIG. 2 is a plan view of the interior with the upper case cut away, and FIG. 3 is a bottom view. Fourth
The figure is a longitudinal side view illustrating the mounting force of a spring member that elastically biases the front cover pivoted on the front surface of the main body case to a closed position. Figures 5 to 9 show the front lid closing lock mechanism, with Figure 5 being a perspective view and Figure 6 being a perspective view.
The figure is a plan view, Figure 7 is a sectional view taken along line A-A in Figure 6, Figure 8 A is a sectional view taken along B-B in Figure 6, and Figure 8 B is a cross-sectional view taken along line C-C in Figure 6. figure,
FIG. 9 is a longitudinal sectional view corresponding to FIG. 8B when the front cover is opened. 10 to 12 show a first embodiment of the tape tension mechanism according to the present invention, and FIG. 10 is an enlarged plan view of the main part;
Figure 1 is a sectional view taken along the line D-D in Figure 10, and Figure 12
The figure is a sectional view taken along line E-E in FIG. 11. FIG. 13 is a plan view showing a second embodiment of the tape tension mechanism according to the present invention. FIG. 14 is a plan view showing a third embodiment of the tape tension mechanism according to the present invention. 15 and 16 show a fourth embodiment of the tape tension mechanism according to the present invention, FIG. 15 is an enlarged plan view of the main part, and FIG. 16 is a cross section taken along the line F--F in FIG. 15. It is a diagram. 1st
Figure 7 shows the fifth part of the tape tension mechanism according to the present invention.
FIG. 16 is a longitudinal cross-sectional view corresponding to FIG. 16, showing an embodiment. 1...Main case, 2...Upper case, 3...Lower case, 4...Magnetic tape, 5, 6...Tape reel, 7, 8...Main tape guide member, 9...Tape loading pin Pocket to enter, 12...
Lamp insertion hole, 17...Front cover, 18...Front plate of the front cover, 19...Top wall of the front cover, 20...Left and right side pieces of the front cover, 21...Pivot of the front cover, 24... Spring member, 25... Front cover locking mechanism, 26... Notch window, 27... Lock release hole, 28... Support shaft, 29
... Locking piece, 30 ... Locking tool, 31 ... Spring member, 39 ... Tape loading pin, 47 ...
Lower flange of tape reel, 48... Engaging tooth, 5
0... Reel brake means, 51... Support shaft, 52
...Through hole, 53...Brake piece, 54...Spring member, 60...Tape tension mechanism, 61...Boss, 62...Pin, 63...Intermediate tape guide member, 67...Vertical shaft, 68 ...Rotating arm, 69
... Tape tension member, 72 ... Spring member.

Claims (1)

[Scope of Claim for Utility Model Registration] Tape reels 5 and 6 on which magnetic tape 4 is wound are rotatably arranged on the left and right sides inside the main body case 1, and main tape guide members 7,
8 are arranged so that the magnetic tape 4 is led out from one supply side tape reel 5 to the front of the main body case 1 via these main tape guide members 7 and 8 and wound onto the other winding side tape reel 6. In the magnetic tape cartridge shown in FIG. In addition to arranging the member 63, a rotary arm 68 is horizontally rotatably supported on the boss 61, and a tape tension member 69 that horizontally rotates around the intermediate tape guide member 63 is provided on the rotary arm 68. The tape tension member 69 is provided with a means for rotationally urging the tape tension member 69 in one direction, and the magnetic tape 4 is wound around the outer peripheral surfaces of the intermediate tape guide member 63 and the tape tension member 69 in an S-shape in a plan view. A magnetic tape cartridge characterized in that tension is applied to the magnetic tape 4 by a rotationally biased tape tension member 69.