JP3032580U - Magnetic tape unit - Google Patents

Abstract

(57) [Abstract] [Problem] To reduce the manufacturing cost with a simple structure and a small number of parts. SOLUTION: At the time of loading, the tension lever 1
By raising 2, the band brake 16 is tensioned and brought into contact with the supply reel base 2, and at the time of unloading,
In the magnetic tape device in which the band brake 16 is loosened by tilting the tension lever 12, the tension lever 12 and the end of the band brake 16 are intervened by the band locking member 35 pivotally attached to the tension lever 12. An engaging member 36 that is connected to the band locking member 35 and is engageable with the band locking member 35 is provided at an appropriate position of the chassis 13. The band locking member 35 is engaged by tilting the tension lever 12 during unloading. The member 36 is engaged and rotated, whereby the band brake 16 is tensioned and brought into contact with the supply reel base 2.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a magnetic tape device for recording, reproducing or erasing on a magnetic tape, and particularly to prevent loosening of the magnetic tape during unloading.

[0002]

[Prior art]

 An example of this type of magnetic tape device will be described with reference to FIG. 4. Reference numeral 1 is a tape cassette, 2 is a supply reel stand that engages with the supply reel of the 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. A tension post 15 is provided upright on the tip of the lever. Reference numeral 16 is a band brake wound around the circular portion 2a of the supply reel base 2 half way, and both ends thereof are locked to the chassis 13 and the tension lever 12 via band locking members 17 and 18, respectively. . Reference numeral 19 denotes a mode switching lever, which is configured to be capable of reciprocating in the direction of arrow c or d by fitting a long hole 19a formed along the longitudinal direction thereof into a protrusion 13a protruding from the chassis 13. The tension cam 19b of the mode switching lever 19 and the base end portion 12a of the tension lever 12 are interlockingly connected via a tension mechanism 20.

The tension mechanism 20 is swingably supported by the chassis 13 via a pivot shaft 21a, and an engaging pin 21b protruding from one end of the tension mechanism 20 engages a cam 19b. Between the pressing spring 22 for urging the swing lever 21 to push the engagement pin 21b against the cam 19b, and the base end portion 12a of the tension lever 12 and the other end portion of the swing lever 21. A connecting spring 23 stretched over the connecting spring 23, a connecting rod 25 fitted in the connecting spring 23 and having one end thereof locked to the connecting spring 23 by a locking ring 24, the connecting spring 23 and the connecting rod 25. And a guide frame 26 for guiding.

Reference numeral 32 denotes an emergency braking mechanism which, when the recording, reproduction, reproduction frame advance, and reproduction fast-forward modes are stopped, is operated by the cam 19d of the mode switching lever 19 so that the brake section 32a is supplied to the supply reel stand. The magnetic tape T is pressed against the circular portion 2a of No. 2 and braked (see the phantom line in FIG. 4) to prevent the magnetic tape T from slackening.

In the above structure, when loading, as shown by the solid line in FIG. 4, the forward movement c of the mode switching lever 19 causes the coupling spring 23 of the tension mechanism 20 to pull 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.

Further, at the time of unloading, as shown in FIG. 5, by moving the mode switching lever 19 back and forth, the base rod 12 a of the tension lever 12 is pushed up by the connecting rod 25 of the tension mechanism 20. The tension lever 12 is tilted in the direction of the arrow b, the tension post 15 is separated from the magnetic tape T, the back tension for the magnetic tape T is released, and the band brake 16 is loosened in conjunction with this.

Conventionally, an unloading brake mechanism 27 is provided in order to prevent the supply reel base 2 from rotating and the magnetic tape T from loosening during unloading. This is because a brake lever 28 that opposes the circular portion 2a of the supply reel base 2 with the band brake 16 in between is pivotally supported by the chassis 13 via a pivot shaft 29, and the brake lever 28 is also supported. The engaging pin 30 protruding from the center of the brake lever 28 is engaged with the cam groove 19c of the mode switching lever 19, and the spring 31 for urging the tip of the brake lever 28 toward the circular portion 2a is provided with the brake lever 28. Since the brake lever 28 is engaged with the base end of the brake lever 28 at the time of loading shown in FIG. 4, the front end of the brake lever 28 is separated from the circular portion 2a. In the unloading state, the tip of the brake lever 28 is brought into contact with the circular portion 2a via the band brake 16 as shown in FIG. The base 2 is braked to prevent the magnetic tape T from slackening.

[0008]

[Problems to be solved by the device]

 In the above conventional configuration, the structure of the unloading brake mechanism 27 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.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 is such that both ends of a band brake wound around a supply reel base rotatably provided on a chassis are rotatably supported by the chassis and the chassis. It is locked to the tension lever, and by raising the tension lever at the time of loading, the band brake is tensioned and brought into contact with the supply reel base, and at the time of unloading, the tension lever is tilted. In a magnetic tape device in which the band brake is loosened, the tension lever and an end of the band brake are connected via a band locking member pivotally attached to the tension lever, An engaging member that can be engaged with the By defeating, the band locking member is pivoted in engagement with the engaging member, thereby, is characterized by being configured to so that is brought into contact with the supply reel table by tensioning the band brake.

[0011] In the above-mentioned configuration, the tension lever is raised at the time of loading to tension the band brake to bring it into contact with the supply reel base, thereby braking the supply reel base and preventing the magnetic tape from slackening. You can

[0012] Further, at the time of unloading, the band brake is loosened by tilting the tension lever, but the band locking member pivotally attached to the tension lever is engaged with the engaging member and rotated, whereby Since the band brake is tensioned to come into contact with the supply reel base, in this case also, the supply reel base can be braked to prevent the magnetic tape from loosening.

In this case, the band locking member pivotally attached to the tension lever and the engaging member provided on the chassis brake the supply reel base during unloading to prevent the magnetic tape from loosening. Compared to the conventional unloading break mechanism, the structure is simple, the number of parts is small, and the manufacturing cost can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the band locking member is formed in a substantially dogleg shape, and a central portion thereof is rotatable with respect to a tension lever via a pivot shaft. It is characterized in that it is pivotally mounted, the end of the band brake is connected to one end of the band brake, and the engaging member is provided at an appropriate position of the chassis so as to face the other end.

In the above structure, when the other end of the band locking member abuts on the engaging member during unloading, the band locking member rotates about the pivot shaft, and the band engaging member rotates. The band brake is pulled by one end of the stop member, whereby the band brake can be tensioned and brought into contact with the supply reel base, and the supply reel base can be braked to prevent the magnetic tape from loosening. .

In this case, the tension lever may be pivotally attached to the conventional band locking member instead of the conventional band locking member, so that the number of parts does not increase and the manufacturing cost is kept low. be able to.

A third aspect of the present invention is the device according to the first or second aspect, wherein the engaging member is a bar member that is erected at a proper position on the chassis.

According to the above configuration, the engaging member is made of a bar member provided upright on the chassis, and the structure is extremely simple, so that the manufacturing cost can be kept low.

[0019]

[Embodiment of device]

 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 a band-shaped locking member 35 having a substantially V shape is attached to a central portion of a tension lever 12 via a pivot shaft 37. Is rotatably pivoted, one end portion 35a of the band locking member 35 is connected to the end portion of the band brake 16, and the other end portion 35b of the band locking member 35 is made of a bar material. An engaging member 36 is erected at a proper position on the chassis 13. Since the configuration other than the above is almost the same as that of the conventional example shown in FIGS. 4 and 5, the same parts are designated by the same reference numerals and the description thereof will be omitted.

In the above configuration, when loading, as shown by the solid line in FIG. 1, by rotating the tension lever 12 in the direction of the arrow a to raise it, the band brake 16 is tensioned and the circular portion 2a of the supply reel base 2 is moved. By making them contact, the supply reel base 2 can be braked to prevent the magnetic tape T from loosening.

Further, at the time of unloading, as shown in FIG. 3, by rotating the tension lever 12 in the direction of the arrow b and tilting it, the band brake 16 is loosened, and the other parts of the band locking member 35 are released. The end portion 35b is engaged with the engaging member 36, and the band locking member 35 is rotated around the pivot shaft 37, whereby the band brake 16 is tensioned and brought into contact with the circular portion 2a. The magnetic tape T can be prevented from loosening by applying a brake to the supply reel base 2.

According to the above structure, the band locking member 35 of the present invention is attached in place of the band locking member of the existing device (see FIGS. 4 and 5), and the engaging member 36 made of a bar material is attached to the chassis 13. In this case, since the unloading brake mechanism 27 (see FIGS. 4 and 5) of the existing device can be omitted, the structure is simple, the number of parts is small, and the manufacturing cost is low. can do.

[0023]

[Effect of device]

 According to the first aspect of the present invention, the band locking member pivotally attached to the tension lever and the engaging member provided on the chassis brake the supply reel base during unloading to prevent the magnetic tape from loosening. As compared with the conventional unloading brake mechanism, the structure is simple, the number of parts is small, and the manufacturing cost can be reduced.

According to the second aspect of the invention, the tension lever may be pivotally attached to the tension lever in place of the conventional band locking member, so that the number of parts is increased. Therefore, the production cost can be kept low.

According to the third aspect of the present invention, the engaging member is made of a bar member provided upright on the chassis, and the structure is extremely simple, so that the manufacturing cost can be kept low.

[Brief description of 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 same main part.

FIG. 3 is a schematic plan view at the time of unloading.

FIG. 4 is a schematic plan view of a conventional example during loading.

FIG. 5 is a schematic plan view at the time of unloading.

[Explanation of symbols]

 2 Supply reel base 2a Circular part of supply reel base 12 Tension lever 13 Chassis 16 Band brake 35 Band locking member 35a One end of band locking member 35b Other end of band locking member 36 Engaging member 37 Pivot shaft

Claims (3)

[Scope of utility model registration request] 1. A loading reel base rotatably mounted on a chassis, wherein both ends of a band brake wound half around are locked to the chassis and a tension lever pivotally supported on the chassis for loading. At this time, by raising the tension lever, the band brake is tensioned and brought into contact with the supply reel base, and the band brake is relaxed by tilting the tension lever at the time of unloading. The tension lever and the end of the band brake are connected via a band locking member pivotally attached to the tension lever, and an engaging member engageable with the band locking member is provided at an appropriate position on the chassis. The band locking member is engaged by tilting the tension lever during unloading. A magnetic tape device, wherein the magnetic tape device is configured to be engaged with a coupling member and rotated, whereby a band brake is tensioned and brought into contact with the supply reel base. 2. The band locking member is formed in a substantially V shape, and a central portion of the band locking member is pivotally attached to a tension lever via a pivot shaft, and one end of the band brake member is provided. 2. The magnetic tape device according to claim 1, wherein the end portions are connected to each other, and the engaging member is provided at an appropriate position on the chassis so as to face the other end portions. 3. The magnetic tape device according to claim 1, wherein the engagement member is made of a bar member that is erected at a proper position on the chassis.