JPS599090B2 - Magnetic tape attachment/detachment position detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape attachment/detachment position detecting device, which eliminates the need for a special leader tape such as conductive tape or transparent tape in a magnetic tape device used, for example, in a peripheral device of a computer. The present invention relates to a magnetic tape attachment/detachment position detection device.

In the conventional magnetic tape attachment/detachment method, conductive tape or transparent tape is used as the leader tape with one end fixed to the take-up reel, and when the magnetic tape is unloaded, short-circuit current occurs when the conductive tape passes. In response to these detections, the traveling of the magnetic tape is stopped at a predetermined position by detecting the amount of transmitted light when passing through the transparent tape, and at that stop position the magnetic tape provided at the other end of the leader tape is stopped. The mail tab is separated from the mail tab provided at one end of the file tape.

When loading a magnetic tape, the female tab of the leader tape and the mail tab of the file tape are connected at the stop position, and then the magnetic tape is run in the forward direction. However, conductive tape and transparent tape are special tapes and are more expensive than magnetic tapes used for file tapes.

A detachable method using a magnetic tape similar to that used for file tapes as a leader tape is also known.

According to this method, as shown in FIG. 1, a tape start marker (BOT) 2 indicating a writing start position is pasted on one side of a predetermined position of a file tape 1, and a tape start marker (BOT) 2 is attached to one side of a predetermined position of a file tape 1, and Two leader tape detection markers T and 8, which are equivalent to the tape end marker (EOT) 3 that indicates the writing end position affixed to the other side, are located at predetermined positions on the leader tape 5, respectively, as a BOT marker and an EOT. It is placed on the same side as the marker, facing each other. The leader tape detection marker T is detected by BOT detection means, and the leader tape detection marker 8 is detected by EOT detection means. If the leader tape detection markers 7 and 8 are detected at the same time, that is, the BOT detection means
When the leader tape detection marker 7 corresponding to the marker 2 is detected, and at the same time the EOT detection means detects the leader tape detection marker 8 corresponding to the EOT marker 3, it is determined that the unloading time has come, and the tape is at a predetermined position. Stop. At this stop position, the file tape is attached and detached in the same manner as described above. However, according to the above-mentioned attachment/detachment method,
Although the leader tape detection markers 7 and 8 on the leader tape are easily contaminated by friction during running, only one each is arranged in the tape running direction, so for example, only leader tape detection marker 7 was detected. In case B
It may be mistaken for OT2 detection, or leader tape detection marker 8
If only one leader tape detection marker is detected, it is likely to cause so-called chattering, such as being mistaken for the detection of EOT3. Therefore, it is impossible to reliably detect two leader tape detection markers at the same time, so it is necessary to ensure that the magnetic tape is in the specified position. The problem is that it cannot be stopped.

In view of the problems of the conventional type described above, the object of the present invention is to
Using magnetic tape for file tape as a leader tape based on the concept of affixing at least two markers equivalent to the EOT marker in a straight line in the tape running direction on the same side as the marker affixing position. It also makes it possible to reliably stop at a predetermined position during unloading. It is an object of the present invention to provide a relatively inexpensive and simple magnetic tape attachment/detachment position detection device. In the present invention, in a magnetic tape attachment/detachment detection device that connects and disconnects a leader tape whose one end is fixed to a reel and a magnetic tape having a tape end marker, there is provided a magnetic tape attachment/detachment position detecting device that connects and disconnects a leader tape whose one end is fixed to a reel and a magnetic tape having a tape end marker. A leader tape detection marker consisting of at least two markers equivalent to the tape end marker is provided on the side of the magnetic tape, and the tape running is stopped in response to detection of the leader tape detection marker. An attachment/detachment position detection device is provided.

An embodiment of the magnetic tape attachment/detachment position detecting device according to the present invention will be described with reference to FIGS. 2 to 5. FIG.

FIG. 2 is a schematic diagram showing the structure of an embodiment of a leader tape and a file tape applied to the present invention. In FIG. 2, a file tape 1 on which data is written is a conventionally used magnetic tape. On the file tape 1, there is a rectangular tape start marker (BOT) that indicates the writing start position at a predetermined position on the left half of the file tape 1 in the tape traveling direction (arrow direction in the figure) during unloading. ) 2, and rectangular end-of-tape markers (EOT) 3 for indicating the writing end position are provided at other predetermined positions on the right half of the file tape, with the long sides of the rectangles parallel to the tape edges. BOT marker 2
The EOT marker 3 may be made of conventionally used aluminum foil. A mail tab 4 for connecting to and disconnecting from the leader tape 5 is provided at the leading end of the file tape 1 in the direction of movement during unloading. According to the invention, the leader tape 5 is not a special tape such as a conductive tape or a transparent tape, but is an ordinary magnetic tape. A leader tape detection marker (LS) 6 is provided on the leader tape 5 to stop tape running after detecting the leader tape 5.
is provided. The placement position of the LS marker 6 is the EOT marker 3 on the file tape 1 in the width direction of the tape.
This is the same position as the position shown in FIG. 1, and is a predetermined position such that the stop position of the file tape 1 after the detection of the LS marker 6 is a convenient position for attaching and removing the file tape 1 in terms of the tape traveling direction. The LS marker 6 is composed of a plurality of markers substantially equivalent to the EOT marker 3 arranged linearly in the tape running direction. In this embodiment, as shown in FIG. 3, which is an enlarged view of the leader tape 5, an EOT marker with a rectangular long side of 28 m1L is used for 5 m77! Two markers are arranged with an interval of , and these are used as the LS marker 6.
One end of the leader tape 5 is a take-up reel (machine reel)
A mail tab 9 for attaching and detaching the file tape 1 to and from the female tab 4 is connected to the other end. Next, an embodiment of the leader tape detection marker detection device applied to the present invention will be described based on FIG. 4.

As shown in FIG. 4, the leader tape detection marker detection device of this embodiment includes a leader tape detection signal generation circuit 10.
The tape loading signal (TLD) becomes ``11'' when the leading edge of BOT marker 2 is detected when traveling in the forward direction, and becomes 60'' when the trailing edge of BOT marker 2 is detected when traveling in the reverse direction.
) generating circuit 20 detects the leading edge of the EOT marker 3 and generates the signal EOT, and when traveling in the reverse direction, the TLD is activated.
The count enable signal generating circuit 30 generates a count enable signal CE which becomes "1" during the EOT marker detection period when the count is 1. The leader tape detection signal generation circuit 10 includes a capstan tachometer 11 that generates one pulse through a slit 17 each time the capstan 12 rotates by a predetermined angle, such as, for example, and amplifies the resulting pulse train. Photo amplifier 13
The first input receives the output of the photoamplifier 13, and the second input receives the output of the photoamplifier 13. It receives the count enable signal CE, counts the number of pulses during the period when the count enable signal CE is ``1'', and outputs 1r'' when the counted number of pulses corresponds to the traveling distance of two or more tape end markers. mileage counter 14 and mileage counter 1 on the first input.
A first AND gate 15 receives the output of the AND gate 15 and receives the signal EOT generated in the count enable signal generation circuit 30 at its second input, and receives the output of the AND gate 15 at its first input and receives the signal at its second input. A flip-flop 16 receives the inverted signal *EOT of EOT, and a first
A second AND gate 17 receives the output of the flip-flop 16 at its input, receives the signal TLD obtained by the TLD generation circuit 20 at its second input, and receives the inverted signal *TLD of the signal TLD at its first input. It consists of a third AND gate 18 which receives the signal EOT at its input, and an OR circuit 19 which receives the outputs of the second AND gate 17 and the third AND gate 18. Inputs of the TLD generation circuit 20 and the count enable signal generation circuit 30 are connected to a BOT detection section 41 and an EOT detection section 42 in the photo sense block 40, respectively. Fifth
The figure is a time chart for explaining the operation of the circuit of FIG. 4.

In FIGS. 4 and 5, the photo sense block 40 is present near the leader tape detection marker 6 (FIG. 2) when the magnetic tape is mounted. FIG. 51 shows the clock signal CL input to flip-flops 16, 22, 23, 32, 33 and 36. After the magnetic tape is loaded, the magnetic tape is run in the forward direction, and the forward direction signal FWD maintains "17" while running in the forward direction (FIG. 5, 1).
BOT marker 2 (
2) is detected by the BOT detection section 41 in the photo sense block 40, and this detection signal is sent to the photo amplifier 21.
The signal is amplified and input to the leading edge detection flip-flop 22 (FIG. 5, 4). The flip-flop 22 is set by detecting the leading edge f of the BOT marker 2 (FIG. 2), and the Q output of the flip-flop 22 becomes 61 cells (FIG. 5, 6).
. This 61'' output is received by the flip-flop 23 and becomes BOTI (BOTI) 5611 one clock after the rising edge of the Q output of the flip-flop 22 (FIG. 5, 8). BOTL(7) outputs the BOT leading edge detection signal BOTL (FIG. 5, 10).
)611 and FWDO)61'' are input to the AND gate 25 (FIG. 5, 11), the TLD setting flip-flop 26 is set, and its Q output signal TLD becomes 6.
*TLD of O output becomes 60'' (Fig. 5, 13,
14). This state of signal TLD is maintained until the trailing edge of BOT is detected during reverse direction travel, as will be described later. T
While the LD setting flip-flop 26 is set, the magnetic tape device is in a ready state, and the magnetic tape can be accessed from a host model online, for example. The flip-flop 22 is set so that the output of the photo amplifier 21 becomes 607, and the flip-flop 23 is set so that the Q output of the flip-flop 22 becomes 60''. When a rewind command or an unload command ♦ arrives, the reverse direction signal BWD becomes "1n" (FIG. 5, 3), and the magnetic tape advances at high speed in the reverse direction. When the BOT marker is detected by the BOT detection section 41 in the photosensor block 40 while traveling in the reverse direction, the flip-flop 22 is set in response to the detection of the trailing edge e (FIG. 2) of the BOT marker 2; After one clock delay, the flip-flop 23 is set, thereby obtaining the BOTT trailing edge detection signal BOTT of the output of the AND gate 27 connected to its output (see FIG. 5).
, 7, 8, 12). Since the reverse direction signal BWD when traveling in the reverse direction is 611, the same pulse as BOTT is obtained at the output of the AND gate 28. The output pulse of the AND gate 28 resets the TLD setting flip-flop 26 via the OR gate 29. In this way, in response to the detection of the trailing edge of the BOT marker, TLD becomes 60'' and *TLD becomes 611 (Fig. 5, 13, 14).After this, the magnetic tape is separated from the control of the base machine, and the LS is moved at low speed. Proceed to marker 6 (FIG. 2).As described above, LS marker 6 is placed on the same side of the tape as EOT marker 3, so it is detected by EOT detection section 42 in photo sense block 40. L.L.
The S marker 6 is composed of two markers equivalent to the EOT marker 3, and therefore, the EOT detector 42 detects the LS marker 6 via the photoamplifier 31 and the flip-flop 32 (see FIG. 5). ) The signal EOTI of the Q output of the flip-flop 33 becomes )5611 (FIG. 5, 16). *TLDO)611 and EOTO)11'' are input to the third AND gate 18 of the leader tape detection marker detection circuit 10, and the gate opens (Fig. 5, 1).
9), its output passes through the OR gate 19 and gives 61" to the output LS of the circuit 10. The 61" output of the circuit 10 is regarded as the LS marker (Fig. 5, 20). It often happens that the BOT marker 2 cannot be detected while driving.

This can occur due to contamination of the BOT marker or high speed driving. When BOT marker 2 is not detected even though BOT marker 2 has passed through photo sense block 40, flip-flops 22 and 23 remain in the set state, and therefore flip-flop 26 for TLD setting remains set. Signal TL even after passing BOT marker
D is 617, *TLD is "07" (Fig. 5, 13, 1)
4 dotted line).

In this case, the magnetic tape continues to run at high speed even after passing the BOT marker, but the LS marker is reliably detected by the following operation. That is, in the count enable signal generation circuit, the output of the flip-flop 32 (FIG. 5, 15)
and Q output *EOT of flip-flop 33 (Fig. 5, 16
) are both 611, the EOT leading edge signal EOTL (FIG. 5, 18) obtained at the output of the AND gate 34, and TL
1'' of D (dotted line in FIG. 5, 13) opens the gate of the AND gate 35 (FIG. 5, 21), thereby setting the flip-flop 36 to output the count enable signal C.
E is generated (Fig. 5, 22). The count enable signal CE sets two EOT markers, namely LS marker 6 to E
When the detection is completed in the OT detection section 42, it is reset by the signal *GO. In this embodiment, 2 of LS marker 6
The length of each marker is 281 m and they are arranged at intervals of 51 U, so the count enable signal is 61'' during the tape running period of 611 u. is applied to the second input of the distance counter 14. If a pulse corresponding to a distance greater than 281 m, e.g. Figure 5 13
). Then, AND gate 15 is opened and flip-flop 16 is set (FIG. 5, 24). The AND gate 17 is opened by the output of the flip-flop 16 and the signal TLDO) 117, and 6r' is obtained at its output (Fig. 5, 2).
6) Determined as LS marker via OR gate 19 (
Figure 5 27). By providing two LS markers 6 in the tape running direction, L
The possibility that the S marker cannot be detected is extremely reduced compared to the case where two LS markers 7 and 8 are provided in the width direction of the tape and detected at the same time as in the conventional example. In this way, when the LS marker is detected or deemed to be an LS marker, the magnetic tape stops running.

At this stop position, the magnetic tape is attached and detached. It is clear that the logic circuit for determining the LS marker is not limited to the embodiment shown in FIG. 3, but may be other circuits.

For example, in the above-described embodiment, the passing distance of the EOT marker was counted, but it is also possible to detect the number of EOT markers and determine that when two or more EOT markers are detected, it is an LS marker. Further, the number of markers on the leader tape is not limited to two, and more markers may be arranged.

Furthermore, the distance between markers is not limited to 5w1t, but may be any distance within a predetermined distance range. According to the present invention, on the leader tape, at least two markers equivalent to the EOT marker are affixed consecutively in a straight line in the tape running direction on the same side as the affixing position of the EOT marker on the file tape. Based on the concept, it is possible to use a magnetic tape for file tapes as a leader tape, and it can be reliably stopped at a predetermined position during unloading.A relatively inexpensive and simple method for attaching and detaching magnetic tapes is obtained. It will be done.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the structure of a magnetic tape used in a conventional magnetic tape attachment/detachment system, FIG. 2 is a diagram showing the structure of an embodiment of the magnetic tape applied to the present invention, and FIG. An enlarged view of the leader tape in the figure, FIG. 4 is a block circuit diagram of an embodiment of the leader tape detection marker detection device applied to the present invention, and FIG. 5 is a time chart for explaining the operation of the device shown in FIG. be. 1... File tape, 2... Tape start marker (BOT marker), 3... Tape end marker (EOT marker), 5... Leader tape, 6... Leader tape detection marker (LS marker), 10... Leader tape detection signal (LS)
Generation circuit, 14... Mileage counter, 20.
...Tape loading signal (TLD) generation circuit, 30...Count enable signal (CE) generation circuit, 40...Photo sense block, 41
...BOT detection section, 42...EOT detection section, BOTL...BOT leading edge detection signal, BO
TT...BOT trailing edge detection signal, EOTL...
...EOT trailing edge detection signal.

Claims (1)

[Claims] 1. In a magnetic tape attachment/detachment position detecting device that connects and disconnects a leader tape whose one end is fixed to a reel and a magnetic tape having a tape end marker, the tape end marker is located on the leader tape. A leader tape detection marker consisting of at least two markers equivalent to the tape end marker is provided on the same side as the tape end marker, and means for stopping the tape running in response to detection of the leader tape detection marker is provided. Features: Magnetic tape attachment/detachment position detection device. 2 A tape start end marker is provided on the magnetic tape,
Claim 1: After detecting the trailing edge of the tape start marker when unloading the magnetic tape, the running of the magnetic tape is stopped in response to detection of the leader tape detection marker. Apparatus described in section. 3. A patent claim characterized in that the magnetic tape is provided with a travel distance counter that counts the distance traveled while the leader tape detection marker is being detected, and stops the travel of the magnetic tape in response to a count of a predetermined distance or more by the counter. The device according to item 1.