JP3036041U - Magnetic tape unit - Google Patents

Abstract

(57) [Summary] [Problem] To provide a simple structure, a small number of parts, and a low production cost. SOLUTION: One end of a band brake 16 wound around a circular portion 2a of a supply reel stand 2 is a tension lever 12.
And the other end of the band brake 16 is locked to a band locking member 45 pivotally attached to the chassis 13. At the time of unloading, the spring 30 is loosened and the brake lever 20 is used to lock the band. By rotating the stop member 45, the band brake 16 is pulled and the tension lever 12 is tilted.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a magnetic tape device for recording, reproducing or erasing data on a magnetic tape, and more particularly to a tension lever which can be reliably tilted with a simple structure during unloading.

[0002]

[Prior art]

 An example of this type of magnetic tape device will be described with reference to FIG. 5. Reference numeral 1 is a tape cassette, 2 is a supply reel stand that engages with a supply reel of a tape cassette 1, and 3 is a take-up reel of the tape cassette 1. A take-up reel stand 4 to be combined, 4 is a movable tape guide post for pulling out the magnetic tape T from the tape cassette 1 and winding it around the head cylinder 5, 6 is a full-width erasing head, 7 is a voice erasing head, and 8 is a voice / control. A head, 9 is a fixed tape guide post, 10 is a capstan, 11 is a pinch roller which is pressed against and separated from the capstan 10 via a magnetic tape T, 12 is a chassis 13 in the vicinity of a base end thereof, and a pivot shaft 14 in between. It is a tension lever pivotally supported in the direction of arrow a or b so as to be able to rotate in the forward and reverse directions. Reference numeral 16 denotes a band brake wound around the circular portion 2a of the supply reel base 2 half the circumference, and both ends thereof are respectively locked to the tension lever 12 and the chassis 13 via band locking members 17 and 18. . Reference numeral 20 denotes a brake lever, which is composed of a brake lever main body 20a and a brake auxiliary rod 20b. The center portion of the brake lever main body 20a is forward and backward in the arrow c or d direction via the pivot shaft 21 to the chassis 13. A brake shoe 20A is rotatably supported, and a brake shoe 20A is provided at the tip thereof. A brake spring 22 that biases the brake shoe 20A toward the circular portion 2a of the supply reel base 2 is a base of the brake lever body 20a. It is engaged with the end.

A mode switching lever 23 is reciprocally moved in the direction of arrow e or f by fitting a long hole 23 a formed along the longitudinal direction of the mode switching lever into a protrusion 13 a protruding from the chassis 13. The tension cam 24 of the mode switching lever 23 and the base end portion 12a of the tension lever 12 are interlockingly connected via a tension mechanism 25, and the braking cam 26 of the mode switching lever 23 is configured. And the brake auxiliary rod 20b of the brake lever 20 are interlockingly connected.

The tension mechanism 25 is pivotally supported by the chassis 13 via a pivot shaft 28 a so as to be pivotable, and an engaging pin 28 b protruding from one end thereof is pivotally engaged with the tension cam 24. Between the lever 28, a pressing spring 29 that urges the rocking lever 28 to press the engagement pin 28b against the cam 24, the base end 12a of the tension lever 12 and the other end of the rocking lever 28. A spring 30 stretched over the spring 30, a push-up rod 32 fitted in the spring 30 and having one end thereof locked to the spring 30 by a lock ring 31, and a guide frame for guiding the spring 30 and the push-up rod 32. And 33.

The center portion of the brake auxiliary rod 20b is pivotally supported by the chassis 13 via a pivot shaft 34, and an engagement pin 35 projecting from one end of the brake auxiliary rod 20b has a cam 26 for braking. And a connecting pin 36 protruding from the other end is engaged with a recess formed on the tip end side of the brake lever main body 20a.

Reference numeral 38 denotes an unloading brake member pivotally supported on the chassis 13 via a pivot shaft 38 a, and an engaging pin 39 projecting from the central portion of the brake member 38 switches modes. A spring 41, which is engaged with the cam groove 40 of the lever 23 and urges the tip end portion 38 b of the brake member 38 toward the circular portion 2 a of the supply reel base 2 via the band brake 16, is a base of the brake member 38. Engaged at the ends.

In the above structure, at the time of loading, as shown by the solid line in FIG. 5, by moving the mode switching lever 23 in the direction of arrow e, the spring 30 of the tension mechanism 25 pulls the base end portion 12a of the tension lever 12. Then, the tension lever 12 is raised in the direction of arrow a. As a result, the tension post 15 is pressed against the magnetic tape T pulled out from the tape cassette 1, back tension is applied to the magnetic tape T, and the band brake 16 is tensioned to contact the circular portion 2a. The supply reel base 2 is braked to prevent the magnetic tape T from slackening.

Next, for example, by pressing the stop button from the fast forward and rewind states, the mode switching lever 23 is moved by one pitch in the direction of the arrow f, and becomes the half loading state as shown by the phantom line in FIG. , The engaging pin 35 of the brake auxiliary rod 20b enters into the concave portion of the brake cam 26, and the brake lever main body 20a is rotated in the direction of the arrow c, whereby the brake shoe 20A is rotated into the circular portion 2a of the supply reel base 2. The supply reel base 2 is suddenly stopped by being pressed against the magnetic tape T to prevent the magnetic tape T from loosening.

At the time of unloading, as shown in FIG. 6, the mode switching lever 23 is moved by 2 pitches in the direction of the arrow f, so that the engaging pin 28 b enters the recess of the tension cam 24 and the swing lever 28. Is swung clockwise, the base end portion 12a of the tension lever 12 is pushed up via the push-up rod 32, the tension lever 12 is tilted in the direction of the arrow b, and the magnetic tape T is placed in the tape cassette 1. Returned inside. At the same time, with the brake shoe 20A separated from the circular portion 2a of the supply reel base 2, the tip portion 38b of the brake member 38 is pressed against the circular portion 2a of the supply reel base 2 via the band break 16. , Prevent the magnetic tape T from loosening.

[0010]

[Problems to be solved by the device]

 In the above conventional configuration, the push-up rod 32 is used to tilt the tension lever 12 at the time of unloading, and in order to prevent the magnetic tape T from loosening due to the rotation of the supply reel base 2, The brake member 38 and the spring 41 are provided, and the structure thereof is complicated, the number of parts is large, and the manufacturing cost is high.

In view of the above conventional drawbacks, the present invention has an object to provide a magnetic tape device having a simple structure, a small number of parts, and a low manufacturing cost.

[0012]

[Means for Solving the Problems]

 In order to achieve the above object, the device according to claim 1 is pulled out from the tape cassette by a spring on a chassis having a supply reel base and a take-up reel base for engaging the tape cassette. A tension lever to apply tension to the magnetic tape and a brake lever to prevent the magnetic tape from slackening by suddenly braking the supply reel base when stopping such as fast forward and rewind. In the magnetic tape device, one end of a band brake wound half around the supply reel base is locked to the tension lever, and the other end of the band brake is locked to a band locking member pivotally attached to the chassis. During unloading, the spring is loosened and the band locking member is rotated by the brake lever. The is characterized by being configured to pull the band brake.

In the above structure, at the time of loading, the tension lever is pulled up by the spring to apply tension to the magnetic tape pulled out from the tape cassette and pull the band brake. As a result, the band brake is brought into contact with the supply reel base in a tensioned state, and the supply reel base is braked so that the magnetic tape is not loosened.

At the time of unloading, the spring is loosened, and the band locking member is rotated by the brake lever to pull the band brake. As a result, the tension lever is tilted, the band brake is brought into contact with the supply reel base in a tensioned state, and the supply reel base is braked to prevent the magnetic tape from loosening.

In this case, at the time of unloading, the band brake can be pulled by the band locking member to securely tilt the tension lever, and the conventional push-up rod for the tension lever is not required, so the structure is simple. The number of points is small and the production cost can be reduced.

Further, since the band brake is tensioned to apply the brake to the supply reel base, the conventional unloading brake member is unnecessary. In this respect also, the structure is simple and the number of parts is small. It is less and the production cost can be reduced.

According to a second aspect of the present invention, in the first aspect of the invention, the brake lever is provided with an engaging portion that is engageable with the band locking member.

According to the above configuration, the brake lever can be reliably interlocked with the swing of the band brake via the engaging portion.

According to a third aspect of the invention, in the invention according to the first or second aspect, one end of the spring is connected to a base end portion of the tension lever, and the other end portion is a mode switching lever. It is characterized by being connected to a rocking lever that is rocked by a tension cam.

According to the above configuration, by swinging the swing lever by the mode switching lever, the tension lever can be reliably pulled up by pulling the spring at the time of loading, and the tension lever can be loosened at the time of unloading. The lever can be allowed to fall.

[0021]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a magnetic tape device according to an embodiment of the present invention, in which one end of a band brake 16 wound half around a circular portion 2a of a supply reel base 2 is inside a tension lever 12. It is locked to a band locking member 43 pivotally attached to the central portion, and the other end of the band brake 16 is also locked to a band locking member 45 pivotally attached to the chassis 13 via a pivot shaft 44. An engaging projection (engagement portion) 46 is projectingly provided on the brake assisting rod 20b of the brake lever 20 so as to face the band locking member 45, and a portion of the chassis 13 adjacent to the band locking member 45 is cut. A projecting piece 47 is formed by raising it, and a bolt 48 is provided between the projecting piece 47 and the band locking member 45 to prevent the space α between the projecting piece 47 and the band locking member 45 from expanding beyond a predetermined value.

A plurality of slits are formed in parallel at a predetermined interval in the central portion of the band locking member 45, and adjacent portions sandwiching the plurality of slits are bent in arcuate directions in mutually opposite directions to form a circular shape. A portion 45a is formed, and the bolt 48 is screwed into a female portion formed on the inner surface of the circular portion 45a. Further, the other end of the band brake 16 is locked to a bottom wall portion 45b formed by bending the bottom edge side of the band locking member 45 at a right angle, and the side edge side of the band locking member 45 is bent at a right angle. Then, the side wall portion 45c is formed, and the engaging protrusion 46 is brought into contact with the side wall portion 45c.

The bolt 48 is inserted into the elongated hole 49 formed in the protruding piece 47, and the head 48 a of the bolt 48 faces the protruding piece 47. Since the configuration other than the above is almost the same as that of the conventional example shown in FIGS. 5 and 6, the same parts are designated by the same reference numerals and the description thereof will be omitted.

According to the above configuration, the tension state of the band brake 16 can be easily changed only by changing the screwing length of the bolt 48 and changing the interval α between the protruding piece 47 and the band locking member 45. Can be adjusted to.

In the above structure, at the time of loading, as shown in FIG. 1, by moving the mode switching lever 23 in the direction of arrow e, the engaging cam 28 pushes the engaging pin 28b and the swing lever 28 moves. The spring 30 is oscillated counterclockwise about the pivot 28a and the spring 30 is pulled, whereby the tension lever 12 is raised in the direction of arrow a, and the tension post 15 applies back tension to the magnetic tape T. You can

When the tension lever 12 is rotated in the direction of arrow a, the band brake 16 is pulled and the band locking member 45 is rotated counterclockwise about the pivot shaft 44, so that the bolt 48 is rotated. The head 48a comes into contact with the protruding piece 47 to prevent the band locking member 45 from rotating. As a result, the band brake 16 is tensioned and comes into contact with the circular portion 2a of the supply reel base 2, and the supply reel base 2 is braked to prevent the magnetic tape T from loosening.

In addition, the engagement pin 35 is pushed by the brake cam 26, and the brake lever main body 20a is rotated in the direction of arrow d via the brake auxiliary rod 20b, whereby the brake shoe 20A is supplied. Is separated from the circular portion 2a.

Next, for example, when the stop button is pressed from the fast forward and rewind states, the mode switching lever 23 is moved by one pitch in the direction of the arrow f, and as shown in FIG. The pin 35 enters the concave portion of the brake cam 26, and the brake lever main body 20a is rotated in the direction of the arrow c via the brake auxiliary rod 20b, whereby the brake shoe 20A moves to the circular portion 2a of the supply reel base 2. When pressed, the supply reel base 2 is suddenly stopped to prevent the magnetic tape T from loosening.

At the time of unloading, as shown in FIG. 4, the mode switching lever 19 is moved by 2 pitches in the direction of arrow f, so that the engagement pin 28b enters into the recess of the tension cam 24, and the swing lever is moved. 28 is rotated clockwise to loosen the spring 30, the engaging pin 35 is engaged with the convex portion 26a of the brake cam 26, and the brake auxiliary rod 20b is rotated about the pivot shaft 34. The band locking member 45 is rotated clockwise and the band locking member 45 is rotated clockwise by the engaging protrusion 46 to pull the band brake 16. As a result, the tension lever 12 is tilted in the direction of arrow b.

In this case, since the conventional tension lever push-up rod 32 (see FIGS. 5 and 6) is unnecessary, the structure is simple, the number of parts is small, and the manufacturing cost can be reduced.

Further, the band brake 16 is released by rotating the tension lever 12 in the direction of the arrow b and inclining it. However, the engagement protrusion 46 abuts on the side wall portion 45c of the band locking member 45, and the band locking member 45 is rotated about the pivot shaft 44 in the direction away from the supply rail base 2. As a result, the band brake 16 is tensioned and brought into contact with the circular portion 2a, so that the supply reel base 2 can be braked and the magnetic tape T cannot be loosened.

In this case, the conventional unloading brake member 38, spring 41, etc. (see FIGS. 5 and 6) are unnecessary, and also in this respect, the structure is simple, the number of parts is small, and the manufacturing cost is low. can do.

[0033]

[Effect of the invention]

 According to the invention as set forth in claim 1, at the time of unloading, the band brake can be pulled by the band locking member to surely tilt the tension lever, and the conventional push-up rod for the tension lever is not required, so the structure is simple. Because the number of parts is small, the production cost can be reduced.

Further, since the band brake is tensioned to apply the brake to the supply reel base, the conventional unloading brake member is unnecessary. In this respect also, the structure is simple and the number of parts is small. It is less and the production cost can be reduced.

According to the second aspect of the invention, the break lever can be surely interlocked with the swing of the band brake through the engaging portion.

According to the third aspect of the invention, by swinging the swing lever by the mode switching lever, the spring can be pulled by pulling the spring at the time of loading and the spring can be surely pulled at the time of unloading. You can allow it to loosen and the tension lever to fall.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a magnetic tape device according to an embodiment of the present invention during loading.

FIG. 2 is an exploded perspective view of the main part.

FIG. 3 is a schematic plan view showing a state where the sudden braking is applied.

FIG. 4 is a schematic plan view at the time of unloading.

FIG. 5 is a schematic plan view of a conventional example during loading.

FIG. 6 is a schematic plan view at the time of unloading.

[Explanation of symbols]

 1 Tape cassette 2 Supply reel stand 3 Take-up reel stand 12 Tension lever 16 Band brake 20 Brake lever 30 Spring 45 Band locking member 46 Engagement protrusion (engagement part) T Magnetic tape

Claims (3)

[Utility model registration claims] 1. A chassis provided with a supply reel stand and a take-up reel stand for engaging a tape cassette,
A tension lever for applying a tension to the magnetic tape pulled out from the tape cassette caused by a spring, and for suddenly braking the supply reel base at the time of stop such as fast forward and rewind to prevent the magnetic tape from loosening. In the magnetic tape device provided with the brake lever, one end of a band brake wound half around the supply reel base is locked to the tension lever, and the other end of the band brake is pivotally attached to the chassis. It is locked to a locking member, and at the time of unloading, the spring is loosened, and the band locking member is rotated by the brake lever to pull the band brake and tilt the tension lever. Magnetic tape device characterized by. 2. The magnetic tape device according to claim 1, wherein the brake lever is provided with an engaging portion capable of engaging with the band locking member. 3. The spring has one end connected to a base end of the tension lever and the other end connected to a swing lever which is swung by a tension cam of a mode switching lever. The magnetic tape device according to claim 1, wherein the magnetic tape device is a magnetic tape device.