JPH0543378U - Supply reel hub structure of magnetic tape unit - Google Patents

Abstract

(57) [Abstract] [Structure] Reel detection pin 104 and reflector 1 when descending
A cover 1 having a notch 3 for accommodating the reel detection pin 104 and the reflection plate 105, as well as closing a space 115 below the supply-side reel hub formed to accommodate 05.
Is attached to the lower surface of the supply-side reel hub 100. [Effect] Since the cover 1 having the notch 3 is attached to the lower portion of the supply-side reel hub 100, it is possible to prevent the leading end of the magnetic tape from entering.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a reel hub structure on a supply side of a magnetic tape device.

[0002]

[Prior Art]

 FIG. 5 is a perspective view of the magnetic tape device, in which a magnetic tape (not shown) wound around the supply reel hub 100 and the take-up reel hub 101 is written / read by the magnetic head 102 while running. It

The supply reel hub 100 is provided with both a means for detecting the presence or absence of a magnetic tape and a means for detecting the possibility of writing.

FIG. 6 is a cross-sectional view of a conventional supply-side reel hub (viewed in the direction of the reference numeral). To the right of the supply-side reel hub 100, a reel detection pin is mounted on a swing bracket 103. 104 and a first reflection plate 105 are provided, and a write permission ring detection pin 107 and a second reflection plate 108 are provided on a swing bracket 106 on the left side of the drawing. The swing brackets 103 and 106 are pushed up by a spring (not shown).

FIG. 7 is an operation diagram of FIG. 6. When the magnetic tape reel 110 is mounted on the supply reel hub 100, the lower surface of the magnetic tape reel 110 pushes down the reel detection pin 104, and The 1 reflection plate 105 also descends.

When the magnetic tape 110 is provided with a write permission ring 111, this ring 111 pushes down the write permission ring detection pin 107 and lowers the second reflection plate 108. The first and second reflecting plates 105 and 108 thus lowered face the photosensor 112.

The photo sensor 112 has a light emitting element and a light receiving element built therein, and determines the presence or absence of the reflectors 105 and 108. That is, in the case of FIG. 6, since there is no object near the front of the photo sensor 112, the projected light beam does not return and the first and second reflection plates 105 and 108 are not detected.

[0008]

[Problems to be solved by the device]

 As shown in FIG. 7, since the swing brackets 103 and 106 descend and rotate with the supply reel hub 100, a large recess 114 is provided in the main base 113 to form a space 115.

However, when the magnetic tape reel 110 set on the supply-side reel hub 100 is referred to as auto-loading, the tip end 117 of the magnetic tape 116 is moved to the take-up reel hub by the centrifugal force, the feeding action of the magnetic tape itself, and the air flow. It is supposed to be sent to 101 automatically. At this time, however, the tip 117 of the magnetic tape 116 passes under the magnetic tape reel 110, enters the space 115, and is entangled with the swing brackets 103 and 106, so that the magnetic tape 116 is rarely damaged. It is in.

The present invention is intended to prevent the leading end 117 of the magnetic tape from entering below the supply reel hub 110 during autoloading, thereby improving the reliability of autoloading.

[0011]

[Means and Actions for Solving the Problems]

 In order to achieve the above object, the present invention closes the space below the supply reel hub, which is formed to accommodate the reel detection pin and the reflection plate at the time of descending, and has a cutout portion for accommodating the reel detection pin and the reflection plate. The cover is attached to the lower surface of the reel hub on the supply side. Should the tip of the magnetic tape invade below the magnetic tape reel, the cover prevents it.

[0012]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the same parts as those described in the section of the prior art are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a plan view of a cover for a supply-side reel hub structure according to the present invention, and FIG. 2 is a cross-sectional view of the same. The cover 1 has a wall 2 ... It was set up. The outer surface of these walls 2 has a low reflectance.

As shown in FIG. 1, a deformed hexagonal shape is used to facilitate press working, and notches 3 and 4 for accommodating the swing brackets 103 and 106 described in the section of the prior art are formed by notches. It becomes. 5 is a boss for screwing. The gap between the walls 2 and 2 is sufficiently smaller than the width of the magnetic tape.

FIG. 3 is a cross-sectional view of the reel hub structure on the supply side of the magnetic tape device of the present invention (viewed in the direction of the reference numeral), in which the cover 1 is screwed to the lower surface of the reel hub 100 on the supply side. Indicates. The boss 5 for screwing is not shown.

The operation of the supply-side reel hub structure of the magnetic tape device having the above structure will be described below.

FIG. 4 is an operation diagram of the supply-side reel hub structure of the magnetic tape device of the present invention, in which the magnetic-tape reel 110 is mounted on the supply-side reel hub 100, and the swing brackets 103 and 106 are attached via the pins 104 and 107. The reel hub 100 on the supply side is rotated to push down and perform auto loading.

If the tip 117 of the magnetic tape 116 penetrates below the magnetic tape reel 110, the tip 117 of the magnetic tape 116 hits the cover 1 and stops. While staying here, the magnetic tape 116 is extracted by centrifugal force or air flow and heads for the reel hub on the winding side. Therefore, the winding of the tip portion 117 of the magnetic tape 116 is prevented.

[0019]

[Effect of the device]

 As described above, according to the present invention, since the cover is attached to the lower portion of the supply-side reel hub, the leading end of the magnetic tape can be prevented from entering.

Since the notch is provided in the cover, the reel detection pin and the reflecting plate are not hindered from moving up and down, so that the existing supply reel hub can be easily attached with the cover.

[Brief description of drawings]

FIG. 1 is a plan view of a cover for a supply reel hub structure according to the present invention.

FIG. 2 is a sectional view of a cover for a supply reel hub structure according to the present invention.

FIG. 3 is a sectional view of the reel hub structure on the supply side of the magnetic tape device of the present invention.

FIG. 4 is an operation diagram of the reel hub structure on the supply side of the magnetic tape device of the present invention.

FIG. 5 is a perspective view of a magnetic tape device.

FIG. 6 is a cross-sectional view of a conventional supply reel hub.

FIG. 7 is an operation diagram of a conventional supply reel hub.

[Explanation of symbols]

1 ... Cover, 2 ... Wall, 3 ... Notch, 100 ... Supply reel hub, 104 ... Reel detection pin, 105 ... Reflector plate, 1
10 ... Magnetic tape, 112 ... Photo sensor, 115 ... Space.

Claims (1)

[Scope of utility model registration request] 1. A magnetic tape reel is attached to a supply-side reel hub, whereby a reel detection pin is pushed down, a reflection plate is lowered together with the reel detection pin, and the reflection plate faces a photo sensor to thereby magnetically detect the magnetic field. In the reel hub on the supply side of the magnetic tape device for identifying the presence or absence of a tape reel,
A cover having a notch for accommodating the reel detection pin and the reflector is formed on the lower surface of the supply reel hub while closing the space below the supply reel hub formed to accommodate the reel detection pin and the reflector when descending. A reel hub structure on the supply side of a magnetic tape device characterized by being attached.