JPH0348752Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to a tension arm retract mechanism, particularly in a magnetic tape device in which the tension arm controls the running of the tape. The present invention relates to a tension arm retracting mechanism that secures a passage for the tape so that the tape can be easily mounted on a take-up hub.

[Conventional technology]

During its operation, the tension arm 1 applies tension to the running tape and controls the running of the tape by providing a buffer area to the tape.
Move to position X drawn by the imaginary line in the figure and tape 2.
It gives tension to. The tape 2 on the supply reel 3 is wound onto the take-up hub 4, and the tape 2 on the supply reel 3
When the tape 2 is rewound on the supply side reel 3, or when it is rewound on the supply side reel 3 in the middle, the tension arm of the tape 2 is The position of arm 1 is the operating position of tension arm 1,
In other words, if it is at position X drawn by the imaginary line,
Next, set the new reel in retainer 7, and
When attaching the tape to the take-up hub 4, the distance between the roller 5 provided at the tip of the tension arm 1 and the vertical guide wall 6a is narrow, making it difficult to pass the tape 2 therebetween. This is particularly difficult in magnetic tape devices that are automatically loaded. Therefore, when the tape 2 has finished being rewound onto the supply reel 3, the tension arm 1 is retracted to the position Y shown by the solid line to widen the tape path and allow the tape to be easily loaded. I'm trying to make it happen.

Conventionally, retraction of a tension arm has been performed using a separate motor or the like. In other words, the theme
For example, the BOT marker that appears when the rewind is finished is detected, and the motor is operated based on the detection signal to retract the tension arm. .

[The problem that the idea aims to solve]

It is desired that the tension arm be retracted without using a separate motor or the like in the tension arm retraction mechanism.

The present invention was developed in view of the above points, and a locking pawl is provided on the tension arm, and the tension arm
When the tension arm moves beyond a predetermined position, that is, when the tension arm exceeds a predetermined rotation angle, a latch pin is provided that engages and latches the locking pawl provided on the tension arm, and the tension arm is newly installed. When the tape is wound onto the take-up hub, the tension arm is unlatched and the motor is turned off.
It is an object of the present invention to provide a tension arm retracting mechanism capable of retracting the tension arm without using a separate tool or the like.

[Means to solve the problem]

Therefore, in the tension arm retract mechanism of the present invention, the starting end of the tape wound around the supply reel is peeled off by the wind blown out from the blower, and the starting end of the tape is moved along the vertical guide wall. This is a retraction mechanism for the tension arm of an automatically installed magnetic tape device in which the tape is guided by the tape and is wound onto the take-up hub via the tension arm which applies tension to the running tape. A rotation angle detection means for detecting the rotation angle of the tension arm moved by the tension;
a latch pin that engages with a locking pawl provided on the system;
A latch pin drive device that drives the latch pin and a BOT/EOT detector that detects BOT/EOT markers provided on the tape are provided, and the device is equipped with a latch pin drive device that drives the latch pin, and a BOT/EOT detector that detects BOT/EOT markers provided on the tape. The tension arm is moved by the tensioner, and the rotation angle detection means detects that the tension arm exceeds a predetermined rotation angle, and based on the detection signal, the locking pawl of the tension arm is connected to the tension pin drive device via the latch pin drive device. When the tension arm is disengaged from the latch pin and moved to the free position, and the tape wound on the take-up hub is unwound onto the supply reel, the
Based on the detection signal of the BOT/EOT detector that detects the BOT marker, the tension arm is moved by the large tension of the tape generated when the take-up hub is reversed, and the tension arm is rotated through a predetermined rotation angle. The locking claw of the tension arm and the latch pin engage with each other when the tension arm is exceeded, and the tension arm is retracted to the retract position. An embodiment of the present invention will be described below with reference to the drawings.

〔Example〕

FIG. 1 shows a plan view of the main components of the magnetic tape device with the top cover removed.

The automatic loading of the tape wound around the supply reel 3 set in the retainer 7 in FIG. 1 will be explained as follows. That is, the supply reel 3 set in the retainer 7 rotates counterclockwise. At this time, the starting end of the tape 2 that was in close contact with the supply reel 3 is peeled off from the wound tape by the wind blown out from the air outlets 11, 12, 13, and , 13, along the vertical guide wall 6a.
Move towards room 1. As will be explained in detail later, the tension arm 1 is in a retracted state at this time, that is, at the position Y drawn by the solid line, and the roller 5 provided at the tip of the tension arm 1 and the vertical guide wall 6a are in a retracted state. The gap between the two ends forms a passage through which the starting end of the peeled tape 2 can easily pass through. When the starting end of the tape 2 passes between the tape sensors 8 and 9, such as light emitting and receiving elements, the retainer 7 begins to rotate clockwise, and the supply side reel 3
The supply reel 3 rotates so that the wound tape is naturally unwound. As a result, the starting end of the tape 2 that has passed between the tape sensors 8 and 9 is rotated in a direction in which the supply reel 3 naturally unravels the tape, and 11,1
The vertical guide wall 6b is caused by the wind blowing from 2 and 13.
Move under the guidance of. When the starting end of the tape 2 passes through the BOT/EOT detector 14 and reaches the take-up hub 4, the starting end of the tape 2 reaches the take-up hub 4 due to the suction action from the take-up hub 4. It becomes suctioned and wound up. When the tape 2 is wound on the winding hub 4 and tension is applied to the tape 2 in this way, the micro switch 33 is activated and engaged with the locking pawl 1a of the tension arm 1. The latch pin 15 moves to release the latch on the tension arm 1. Since the tension arm 1 is pulled by the elastic force of the spring 16, the tension arm 1, which is pivotally supported by the shaft 17, has a hook-shaped bent portion.
Mo 1 moves to position X drawn by an imaginary line. As a result, tension is applied to the tape 2, and the tape comes into close contact with the surfaces of the magnetic head 21 and the cleaner 22 provided between the guide rollers 19 and 20. Note that 18 is a spring stopper plate.

Figure 2 shows the tension arm section A-A in Figure 1.
FIG.

In the figure, one end of the tension arm 1 is firmly fitted to the upper part of the shaft 17, and a roller 5 is rotatably supported at the other end of the tension arm 1 via a pin 23. There is. The roller 5
guides the tape 2 explained in FIG. The shaft 17, which is integrally fitted with the tension arm 1, is connected to the base 26 via bearings 24 and 25.
is supported by A connecting member 27 is fitted into the lower end of the shaft 17, and the shaft of a potentiometer 28 is fitted into the connecting member 27, and is fixed with set screws 29 and 30, respectively. The connection member 27 is provided with a rotation angle detection lever 32 fixed with a screw 31, and the rotation angle detection lever 32 is fixed to the base 26.
The actuator 34 of the micro switch 33 attached to the lower end surface of the rotation angle detection lever 32
One end of the is configured to be pressed. Therefore, tension arm 1 is tightened by tensioning tape 2, etc.
When the tension arm 1 moves, the shaft 17 rotates, and the rotation angle detection lever 32 connected thereto also rotates at the same time. Therefore, when the movement of the tension arm 1 exceeds a predetermined rotation angle, the rotation angle detection lever 32 rotates. −
32 is the actuator 3 of the micro switch 33
Pressing 4 will turn on the switch.

FIG. 3 is an explanatory layout diagram illustrating the arrangement of the tension arm rotation angle detection means and the drive device for driving the latch pin, which are disposed under the base near the tension arm and latch pin; Reference numbers 1, 14 to 19, 21, 22 correspond to those in FIG. 1, and numbers 32 to 34 correspond to those in FIG. 35 is a solenoid, 36 is an action rod, 37 is a spring, 38 is a latch lever, 39
represents the axis. These structures and their operations will be explained with reference to FIG. 4 below.

4 is a sectional view taken along the line B--B of the drive device for driving the latch pin of FIG. 3. FIG.

3 and 4, a solenoid 35 is attached to the lower end surface of the base 26 via a solenoid mounting plate 40.
is fixed. The operating rod 36 of the solenoid 35 is slotted and is inserted into the plate of the latch lever 38 which is bent into a U-shape.
The actuating rod 36 and the latch lever 38 are pivotally supported by a screw 41. One end of the latch lever 38 is supported on the base 26 by a shaft 39, and the shaft 42 of the latch pin 15 is attached to the other end of the latch lever 38. The shaft 42 protrudes from a hole 43 made in the base 26, and is configured to engage with a roller 44 provided at the upper end of the shaft 42 and the locking pawl 1a of the tension arm 1. ing. When the drive device for the latch pin 15 configured in this manner operates, that is, when the solenoid 35 operates, the working rod 36 is attracted into the solenoid 35, so the latch lever 38 moves toward the solenoid 35 with the shaft 39 as the central axis. do. Therefore, the latch pin 15 moves in the direction of the arrow in FIG. 3, that is, from right to left.
In the case of FIG. 4, the movement is from the front side of the page to the back side. As a result, the locking pawl 1a of the tension arm 1 is disengaged from the latch pin 15, and the tension arm 1 becomes free, as shown in FIG. Tension arm 1 will move to position X drawn by the imaginary line.

FIG. 5 is an explanatory diagram illustrating the relationship between the locking pawl of the tension arm and the latch pin, and reference numerals 1, 1a, 15, and 17 correspond to those in FIG. 1.

In the figure, the tension arm 1 is shown from position X, where the tension arm 1 is drawn by the imaginary line shown in FIG. This shows what happens when you move to the left.
Normally, when the magnetic tape device is writing or reading, the locking pawl 1a of the tension arm 1 is separated from the latch pin 15, as shown in the figure. When the tension arm 1 moves to the left from this position push. At this time, the solenoid 35 is not operating and its operating rod 36 is
5 side, and the spring 37 is contracted. When the tension arm 1 further moves to the left, the engagement between the roller 44 of the latch pin 15 and the linear portion 1b of the locking pawl 1a of the tension arm 1 is released, and the elasticity of the spring 37, which had been contracted, is released. The force moves the latch pin 15 to the right and latches the tension arm 1 as shown in the figure.

Next, the operation of the tension arm retract mechanism of the present invention will be explained.

In FIG. 1, for example, the table of the supply reel 3 is
When the tape 2 is written or read and the tape 2 is wound on the winding hub 4, the tape 2 is
In order to rewind the tape 2 onto the tape 2, the supply reel 3 is rotated in the direction of the arrow shown in the figure, that is, counterclockwise.
is rewound onto the supply reel 3. At this time, the tension arm 1 is at the position X drawn by the imaginary line, and the locking pawl 1a of the tension arm 1 is in the state shown in FIG. When the rewinding of the tape 2 approaches the end, the BOT/EOT detector 14 detects the BOT marker provided on the tape 2, and uses the detection signal to send the winding hub 4 to the winding hub 4. For example, a reverse signal is output. As a result, the take-up hub 4 rotates in the direction to wind up the tape 2, and the supply reel 3 is still rotating in the unwind direction, so it is guided by the roller 5 of the tension arm 1. Tension is applied to the tape 2 held by the user, and the tension arm 1 moves to the left. As the tension arm 1 moves, the shaft 17 also rotates, and accordingly, the rotation angle detection lever 32, which moves integrally with the shaft 17, also moves around the shaft 17 as explained in FIG. By the way, when the tension of the tape 2 becomes stronger and the tension arm 1 moves to the position Y shown by the solid line, the engagement between the locking pawl 1a of the tension arm 1 and the latch pin 15 becomes the latched state shown in FIG. It is in. Then, when the tension of the tape 2 becomes stronger and the tension arm 1 moves slightly to the left from the above Y position, the rotation angle detection lever 3
2 is the actuator 34 of the micro switch 33
is pressed, and the micro switch 33 performs its operation (the micro switch 33 is thus adjusted so that it is turned on when the tension arm 1 moves beyond a predetermined rotation angle). As a result, the rotation of the winding hub 4 in the winding direction is stopped, and the winding hub 4 becomes in a free state. Accordingly, the tension of the tape 2 becomes weaker, and the tape 2 is rewound onto the supply reel 3. The tension arm 1 is latched at the Y position and retracted. Since the tension arm 1 is retracted in this way, the next time a new tape is automatically installed, it can be easily done. The automatic loading of a new tape takes place as described in the first part of this specification, but when tape 2 is loaded, a signal is sent to the solenoid 35, and the actuating rod 36 moves the latch lever 38 into the solenoid. 35 side, the engagement between the latch pin 15 and the locking pawl 1a of the tension arm 1 is released. As a result, the tension arm 1 is moved by the elastic force of the spring 16 to the position X drawn by the imaginary line in FIG.

The rotation angle detection means of the tension arm 1 described above is not limited to pressing the micro switch 33 by moving the rotation angle detection lever 32 shown in FIG. Various means can be used, such as detecting using the potentiometer 28. Further, the drive device for driving the latch pin 15 is not limited to the solenoid 35 shown in FIG. 4.

The tension arm retract mechanism of the present invention allows the tape to be easily installed not only automatically but also manually.

[Effect of idea]

As explained above, according to the present invention, since the tension arm is retracted using the tension applied to the tape, the structure is simple and the operation is reliable. Furthermore, since there is no need to use a motor or the like, the device becomes cheaper.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the main parts of the magnetic tape device with the top cover removed;
A sectional view taken along arrow A-A of the tension arm shown in the figure.
FIG. 3 is an explanatory layout diagram illustrating the arrangement of the tension arm rotation angle detection means and the drive device for driving the latch pin, which are disposed under the base near the tension arm and latch pin; The diagram shows B-B of the drive device that drives the latch pin in Figure 3.
FIG. 5, which is a cross-sectional view taken in the direction of arrows, is an explanatory diagram illustrating the engagement between the locking pawl of the tension arm and the latch pin. In the figure, 1 is a tension arm, 1a is a locking claw,
1b is the straight part, 2 is the tape, 3 is the supply reel,
4 is a winding hub, 5 is a roller, 6a and 6b are vertical guide walls, 7 is a retainer, 8 and 9 are tape sensors, 1
1, 12, 13 are air blowers, 14 is a BOT/EOT detector, 15 is a latch pin, 16 is a spring, 17 is a shaft, 18 is a spring stopper plate, 19, 20 are guide rollers, 21 is a magnetic head, and 22 is a clip. -na, 2
3 is a pin, 24 and 25 are bearings, and 26 is a base.
27 is a connecting member, 28 is a potentiometer,
29 and 30 are push screws, 31 is a screw, 32 is a rotation angle detection lever, 33 is a micro switch, 34 is an actuator, 35 is a solenoid, 36 is an action rod, 37 is a spring, 38 is a latch lever, 39
is the shaft, 40 is the solenoid mounting plate, 41 is the screw, 4
2 represents a shaft, 43 a hole, and 44 a roller, respectively.

Claims (1)

[Claim for Utility Model Registration] The starting end of the tape wound on the supply reel is peeled off by the wind blown out from the blower, and the starting end of the tape is guided along the vertical guide wall. The automatically installed magnetic tape is wound onto the take-up hub via a tension arm that applies tension to the running tape.
A retraction mechanism for a tension arm of a tape device, the mechanism comprising a rotation angle detection means for detecting a rotation angle of the tension arm moved by the tension of the tape, and a rotation angle detection means based on a detection signal from the rotation angle detection means. A latch pin that drives and engages with a locking pawl provided on the tension arm, a latch pin drive device that drives the latch pin, and a BOT/EOT that detects the BOT/EOT marker provided on the tape. The tension arm is moved by the tension generated when the starting end of the tape is wound around the take-up hub, and the rotation angle detection means detects when the tension arm exceeds a predetermined rotation angle. Then, based on the detection signal, the engagement between the locking pawl of the tension arm and the latch pin is released via the latch pin drive device, the tension arm is moved to the free position, and the tape wound on the take-up hub is released. When rewinding the material onto the supply reel, the tail
Detect the BOT marker set at the start of the loop
The tension arm is moved by the large tension of the tape generated when the take-up hub is reversed based on the detection signal of the BOT/EOT detector, and when the tension arm exceeds a predetermined rotation angle, the tension arm is moved. A tension arm retract mechanism characterized in that a locking pawl and a latch pin engage with each other to retract the tension arm to a retract position.