JPS6156574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cartridge detection device for automatic loading of a magnetic tape reel used in a magnetic tape device having an automatic magnetic tape loading function.

[Prior art]

A magnetic tape device attached to a data processing device such as a computer is equipped with a magnetic tape reel (hereinafter referred to as reel) wound with magnetic tape (hereinafter referred to as tape), and is used to write data onto the tape and to Data is read from this tape, but in order to automate the operation of loading the tape over a predetermined running path, the magnetic tape device is equipped with an automatic loading function, and a magnetic tape is attached to the outer periphery of the reel. An automatic loading cartridge is used, and the magnetic tape device performs an automatic loading operation in response to detection of this cartridge.

Please note that this cartridge is standardized.
ANSI (American National Standard Institute).
)X3.85—1981 and ISO (International
Organization for Standardization.）6098―
The details are stipulated by 1982E etc.

However, in the past, a pin was provided on the magnetic tape device side that faced the cartridge and protruded under pressure from a spring, and as the pin moved back due to contact with the cartridge, a micro switch or the like was driven. This detects the cartridge. When the reel rotates, the cartridge opens toward the outer circumference and moves away from the reel. When the reel stops, the cartridge closes in the opposite direction. Since the cartridge performs the action of depositing the material onto the reel, the tip of the pin swings while in contact with the cartridge in response to this action, and the shaft of the pin is damaged due to the pressure of the pin guide plate, causing the pin to become attached to the reel. The protruding and retracting movements of the cartridge become unsmooth, resulting in a drawback that the detection status of the cartridge becomes uncertain.

A countermeasure against this problem is to increase the biasing force in the protruding direction of the pin, but in this case, the cartridge is pressed more than necessary by the tip of the pin, and the flanges provided inwardly on both sides of the cartridge and the reel When the two tapes come into contact with each other, the rotation of the reel becomes unsmooth, and abrasion powder from both pieces adheres to the tape, causing problems such as errors in data writing and reading conditions.

[Summary of the invention]

The present invention has the purpose of fundamentally solving such drawbacks of the conventional art, and includes providing a discharging nozzle with its tip facing the detection target region on the side of the cartridge and at a predetermined distance from the detection target region that does not disappear when opened and closed. In response to this, gas is supplied from the pneumatic converter, and a permanent magnet that is converting the pneumatic power is moved in response to changes in the pressure of the supplied gas depending on the presence or absence of the cartridge, thereby controlling the magnetically sensitive switching element. While the cartridge detection output is sent out through this switching element, a cylindrical airflow is ejected from the outer nozzle surrounding the injection nozzle, thereby blocking the influence from the surroundings. , provides a cartridge detection device for automatic loading of a magnetic tape reel.

〔Example〕

Hereinafter, details of the present invention will be explained with reference to figures showing examples.

FIG. 1 is a rear view of the reel and cartridge seen from the magnetic tape device side. A cartridge 2 is attached to the outer periphery of the reel 1, which has a center hole 1a for attachment to the hub of the magnetic tape device. The projections 2a and tabs 2 correspond to guides provided on the magnetic tape device side to regulate the mounting position.
b, and an opening/closing mechanism 2d having an opening/closing hole 2c.The opening/closing mechanism 2d opens and closes in response to the operation of a lever inserted into the opening/closing hole 2c from the magnetic tape device side, and the outer circumferential rib 2e of the cartridge 2 closes on the reel 1.
The cartridge 2 is opened in the direction of expansion toward the outer periphery of the cartridge, or conversely closed in the direction of contraction. The protrusion 2a that does not disappear even if
The detection target part is determined in the vicinity of .

Figure 2 shows A-O-B or A in Figure 1.
This is a configuration diagram including a -OC cross section, and a tape 6 is wound around a reel 1 attached to a hub 5 that is supported by a drive shaft 4 and protrudes from the front surface 3 of the main body of the magnetic tape device. The tip opening of the injection nozzle 11 is provided at a predetermined interval and substantially perpendicular to the detection target area on the side surface of the cartridge 2 attached to the outer periphery of the reel 1. , a similar outer peripheral nozzle 12 is provided surrounding and integrated with the injection nozzle 11, and these are connected via a support member 13,
It is fixed to the front face 3 of the main body.

On the other hand, _a pneumatic converter 21 is provided to which pressurized air (hereinafter referred to as pressure air ₎ P ₁ used as a gas _is supplied. The pressure air P ₁ that has passed through the orifice V ₁ is released into the atmosphere via the needle valve V ₃ , while the pressure air P ₁ that has passed through the orifice V ₂ is sent out from the outlet 22 and is sent out through the pipe 23 . It is supplied to the injection nozzle 11.

Also, between orifice V ₁ and needle valve V ₃ ,
From between the orifice V ₂ and the outlet 22, pipes branch off and are respectively led to the upper and lower ends of the airtight chamber 24 provided in the vertical direction. A permanent magnet 25 having almost the same dimensions as the cross-sectional shape is housed so as to be able to slide vertically, and when the permanent magnet 25 moves upward, a reed switch LS, which is driven by the magnetic field of the permanent magnet 25, acts as a magnetically sensitive switching element in the airtight chamber 24. It is located on the side.

Note that pressure air P ₂ similar to pressure air P ₁ is supplied to the outer circumferential nozzle 12 through a pipe 31 .

3 and 4 are enlarged cross-sectional views of the cartridge 2 and each nozzle 11, 12, in which the tips 11a, 12a of each nozzle 11, 12 are almost coincident with each other, and the side surface 2f of the cartridge 2 is They face each other at a predetermined distance X ₁ , but as shown in Fig. 3, when the cartridge 2 is not installed, there are no obstacles and the pressure air P ₁ and P ₂ are ejected to almost a distance X ₀ , so that each The fluid resistance seen from the nozzles 11 and 12 is small, and the pressure based on the pressure air _P1 in the injection nozzle 11 is a low value.

Note that the airflow 41 ejected from the outer peripheral nozzle 12 has a cylindrical shape, and surrounds the columnar airflow 42 ejected from the injection nozzle 11, blocking influences from the outside, and in the state shown in FIG. 42 is prevented from spreading, and the pressure in the injection nozzle 11 is kept high.

On the other hand, if the cartridge 2 is attached to the reel 1 as shown in FIG.
The ejection distance of 42 is shortened from X ₀ to the interval X ₁ , and the fluid resistance seen from each nozzle 11 and 12 becomes large.
Correspondingly, the pressure in the injection nozzle 11 increases.

Note that the interval X ₁ is set, for example, to about 1 to 2 m/m.

In addition, in response to the opening of the cartridge 2, the side surface 2f also moves from the closed position shown by the solid line to the open position shown by the chain line, as shown in FIG. 4, and the outer peripheral surface of the cartridge 2 expands in the radial direction by a dimension Y.
If the detection target region is determined as shown in FIG. 1, the side surface 2f will always be present on the front side of each nozzle 11, 12, and detection will be performed reliably.

Therefore, if _the needle valve V ₃ shown in _FIG . ₂ is adjusted in the state shown in _FIG . The pressure applied to the injection nozzle 11 is equal both above and below, and the permanent magnet 25 is located at the lower part of the airtight chamber 24 due to its own weight. However, when the state shown in FIG. 4 is reached, the pressure inside the injection nozzle 11 increases, and Since the pressure P _B also increases, while the pressure P _A applied above the airtight chamber 24 is constant,
The pressure P _B applied below this becomes a high value, and the permanent magnet moves upward due to the application of the pressure P _B to the lower surface, driving the reed switch LS and turning it on.

Then, the power E is applied to the voltage divider circuit formed by the resistors R ₁ and R ₂ via the reed switch LS, and is sent out as a logic circuit level detection output DO, thereby detecting the insertion of the cartridge 2. can do.

The assemblies of the nozzles 11 and 12 and the pneumatic converter 21 are manufactured by Japan Air Pressure Industry Co., Ltd.
APA4-DA20 type and APA1-AA05 type are suitable.

Therefore, the cartridge 2 remains in a non-contact state.
In addition, the operation of the cartridge 2 and the rotation of the reel 1 become smooth, and troubles caused by abrasion powder do not occur, and highly reliable detection is performed.

However, depending on the situation, the support member 13 may be of a sliding type and the interval X ₁ may be freely adjusted, or the airtight chamber 24 may not be oriented vertically, but the fixed position of the permanent magnet 25 may be regulated by a spring. .

Furthermore, instead of using the reed switch LS, a Hall element may be used, and various sensors that respond to the deflection of the permanent magnet 25 may be used as the switching element.

Note that magnetic tape devices use high or low pressure air to control tape running.
Although it is preferable to use pressurized air P ₁ and P ₂ , pressurized inert gas or the like may be used instead, and the supply of these gases is controlled by a solenoid valve, etc., and is supplied only when detection of the cartridge 2 is required. The present invention can be modified in various ways, such as being able to be modified as follows.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, it is possible to detect the presence or absence of a cartridge in a non-contact state, completely eliminate troubles caused by abrasion powder, and make the detection situation highly reliable. A remarkable effect can be obtained in a magnetic tape device attached to a data processing device.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a rear view of the reel and cartridge, FIG. 2 is a configuration diagram, and FIGS. 3 and 4 are enlarged sectional views of the cartridge and each nozzle. 1...Reel (magnetic tape reel), 2...Cartridge, 2a...Protrusion (detection target part), 2f...
Side surface, 6...Tape (magnetic tape) 11...Ejection nozzle, 12...Outer circumferential nozzle, 21...Pneumatic converter, 24
...airtight chamber, 25...permanent magnet, LS...reed switch, DO...detection output, P ₁ ...pressure, X ₁ ...interval.

Claims (1)

[Claims] 1. In a magnetic tape device having a function of automatically loading magnetic tape using an automatic loading cartridge attached to the outer periphery of a magnetic tape reel,
an injection nozzle whose tip is provided at a predetermined interval to face a detection target part on the side surface of the cartridge that does not disappear when opened and closed; gas is supplied to the injection nozzle, and a permanent magnet is moved by the pressure change of the gas depending on the presence or absence of the cartridge. 1. A cartridge detection device for automatically loading a magnetic tape reel, comprising a pneumatic converter that controls a switching element and sends out a detection output of the cartridge via the switching element.