JPS5948847A - Misdetection preventing mechanism of tape end detector - Google Patents

Abstract

PURPOSE:To prevent the misdetection of a tape end, by providing a cancel link at a place close to a revolution detecting plate fitted to a boss of a reel base and preventing an oscillation plate from oscillating slightly within a branch part of a Y-shaped guide hole even though the reel base is stopped. CONSTITUTION:A head recedes form a tape loading position before a pack is inserted, and a head pin 27 also recedes. Therefore a link 23 of the head side is pulled by a spring 25 and turned clockwise to be located apart from a hook pin 22 of a cancel link 20. The link 20 turns counterclockwise by a spring 21, and an arm 20a presses a rotary plate 3 clockwise up to an angle at which a branch part of a Y-shaped guide hole 5 is positioned on a locus drawn by a pin 7 of an oscillation plate 6. The pack is inserted and the reel base of the take-up side starts its revolution and then stops the revolution since the reel base of the supply side is stopped. However a tape end is never detected mistakenly since the plate 3 is revolving.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for detecting the end of a tape using reel-based friction. This relates to a mechanism for preventing false detection of mechanically detected devices.

[Technical background of the invention] Playback/recording status of a tape player (hereinafter referred to as play)
If the tape player continues to fast forward or rewind, and the arp reaches the end, it is necessary to put the tape player in a slow state or, in the case of an O1-return type tape player, to reverse the running direction of the tape. There is. This stopping or reversing operation is automatically performed by the tape player detecting the end of the tape by some means and by a command from this detection device. Therefore, this tape end detection device
This is an extremely important device in tape players, and various types have been proposed in the past. For example, a device that converts the rotation of the reel base into a pulse using a means such as a proximity switch or a converter, electrically senses the rotation of the reel base, and detects the end of the tape, or a device that detects the end of the tape by changing the tension of the tape. There are some methods that perform mechanical detection.

As one of the devices for detecting the end of a tape by mechanical means, one is known that utilizes the friction of a reel base and a rotation detection plate attached thereto.

As shown in Fig. 1, a rotation detection plate 3 is fitted onto the outer periphery of a boss 2 integrally formed on a reel base 1 in a state of friction with the boss 2, and this rotation detection plate 3 is exposed to a medium-high flame. A Y-shaped guide hole is drilled in piece 4 using a scissor/υ. In this Y-shaped guide hole 5, a swing plate 6 is provided separately.
A mounting pin 7 is swingably fitted into one end 6a of the holder. This rocking plate 6 is rotatably supported with respect to a support shaft 8, and the other end 6b is connected to a stop mechanism and a j-beam reversing machine (14) which are activated as a result of tape end detection.
1° Furthermore, this swing plate 6 is swinged by a cam rotated by the driving force of a motor so that its pin 7 reciprocates within the Y-shaped guide hole 5. .

That is, this cam 9 is installed near the center of a pulley 10 that is constantly driven, and the cam small lower bin 11 installed on the end 6b of the swing plate 6 is connected to the cam 9. As the pin 7 moves along the circumferential surface of the pin 7, as shown in FIG.
moves from the branch point of the Y-shaped guide hole 5 to the tip of each branch part. Ma/C, pulley 10 [outside cam 9 11I111. This is island-shaped cam 1 with cam 9 and self 11.
2 is provided, and as shown in FIG.
When moving the circumferential surface of the island-shaped cam 12, the pin 7 reciprocates from the base of the Y-shaped guide hole 5 to the I filter branch (tip of the protrusion 4). .

A spring 13 is stretched between the rocking plate 6 and the tape player's foot plate, and the cam wheel 1 core pin 11 is connected to the cam 9.
It is biased toward the surface of the island-shaped cam 12.

Detection of the tape end by this device is performed as follows.

First, while the tape is running, the reel base 1 is rotating as shown in Figure 1, so the rotation detection plate 3, which is frictionally engaged with the boss 2, is also pushed by the reel base 1 and rotates. For example, it rotates in the direction of the arrow in the figure. In other words, one branch of the Y-shaped guide hole 5 is in the same direction as the locus drawn by the pin 7 of the swing plate 6. Therefore, the cam small lower bin 11 that is in contact with the constantly rotating cam 9 causes the swinging plate 6 to repeatedly swing in a small amount equal to the length of one branch, so such small swings While the movement is repeated, the tape end is not reached -C, so the stop mechanism and tape reversing mechanism that operate in conjunction with the oscillating plate 6 do not fail.

On the other hand, when the tape end is reached and the reel base 10 rotations stop, the rotation detection plate 3, which had been biased in the direction of the arrow, becomes free (11'). At this point, the engine 7 that has been moving inside the branch due to the action of the cam 9 hits the protrusion 4 at the center of the branch and is no longer able to enter the branch as shown in FIG. a3, when the reel base 1 rotates and friction is applied to the rotation detection plate 3, the pin 7 hits the protrusion 4 (also, the rotation detection plate 3 immediately escapes in the direction of the arrow, so the pin 7 is inside the branch part. can enter.

Even after the pin 7 hits the protruding piece 4 and the rocking plate 6 swings to the middle i, the pulley '10 continues to rotate, so the cam small lower bin 11 does not separate from the circumferential surface of the cam 9. becomes. That is,
As the circumferential surface of the cam 9 approaches the center of the sole 10, the pin 7 of the rocking plate 6 moves toward the branching part of the Y-shaped guide hole 5, but the pin 7 engages with the protrusion 4. The cam follower 11 can no longer follow the cam 9. In this state, if the booley 10 continues to rotate, the cam follower 11 will hit the circumferential surface of the island-shaped cam 12, and this island-shaped force will 11
12, the swing plate 6 starts swinging in the opposite direction.

This island-shaped cam 12 allows the pin 7 to connect to the protruding piece 4
It reciprocates between the base end of the letter-shaped guide hole 5.

Therefore, since the swing plate 6 swings more than when the tape is running, the retain end is determined based on this increase in the amount of swing, and the stop mechanism and tape reversal mechanism linked to the swing plate are activated. let

[Problems with cost technology] By the way, a mechanical tape end detection device using such friction is used in a so-called A-
When used with a loading type tape player,
The following problems arise.

In other words, to load a pack using the driving force of the motor, it is necessary to insert the pack slightly into the pack insertion slot of the tape player, turn on the power, and rotate the motor. The pack is drawn into the 7-Bubray X7 by the E-ta that starts, and it takes a long time for it to be completely loaded.

Therefore, if you transmit Tanabata's rotation to the reel base when the power is turned on, the pack will be;
After the head is pressed against the tape by the tape breaker It got wound up, so the regeneration (or 8@) star 1-i◇! A phenomenon of straightening occurs.

In particular, this discrepancy in the position from star 1 is caused by the beginning of the song being moved to star h (</< when the beginning of the song is set to star h (<) when using a pack that has been set to cellar 1 in advance. This was extremely undesirable as it caused the head to be cut off.

Therefore, in general, an idler or the like is used to prevent the Tanabata side driving force from being transmitted to the reel base until the crimping of the head and pinch roller is completed, and to keep the reel base at rest.However, When a no-rection type tape end detection device like the one shown in Figure 1 is used in this type of tape player, the reel base is not rotating, so the pinch roller or the tape end is detected before the head is crimped. As a result, the stop mechanism acts and the head and pinch roller retreat in the opposite direction from before crimping, and depending on the type of tape breaker ?There was an inconvenience that the program change could occur due to the tape running upside down or being reversed. Also, if there was any slack in the tape inside the pack, there was a risk that the tape would wrap around the pinch roller or capsunter. It is preferable to rotate the reel base on the take-up side to take up slack in the tape before crimping the head or pinch roller. There were also drawbacks that could not be overcome.

``Object of the Invention'' The present invention was proposed in view of the problems of the 7J-1-〇-ding type tape player as described above. It is an object of the present invention to provide a method for preventing erroneous detection of hoop end detection even when the rotation is stopped.

[Summary of the Invention J To prevent false detection of the tape end detection device i'1 of the present invention, it is possible to prevent the tape end detection device i'1 from detecting I'? 1lffl fit in
A cancel link is installed near the υ rotation detection plate, and this main 1 Hunsel link is directed toward the tape side. When the head is in the 3rd position after the 2-movement head is interrupted, the cancel link presses the rotation detection plate to increase the reel base rotation +1. The rotation detection plate was moved to the IN position where it rotated with the 7th riction of J, and even though the u1 reel base was stopped, the oscillation plate still swung slightly within the branching part of the Y-shaped guide hole. This is to prevent detection as the end of the tape.

[Embodiment of the Invention] An embodiment of the present invention will be specifically described below with reference to FIGS. 3 and 1. Incidentally, the same members as those of the conventional type shown in FIGS. 1 and 2 are given the same reference numerals, and the description thereof will be omitted.

The reference numeral 20 in the figure is a main Hunsel link, and this cancel link 20 is rotatably attached to the support shaft at its center. This main 1 Hunsel link 20 has arms 2Qa to 20C extending in three directions, and the tip of the first arm 20a engages with a protrusion 3a provided on the rotation detection plate 3. It is something that A spring 21 is stretched between the second arm 20b and the base plate of the tape player A7, and this spring 21 causes the first arm 20a to press the rotation detection plate 3 in the direction of the arrow in the figure. Link 2
0 is energized. The third arm 20G has an engagement pin 22 at its tip, and one end of the head-side link 23 is engaged with the engagement pin 22.

This head side link 23 has a support shaft 2 at its center.
4 is rotatably supported. Further, a spring 25 is stretched between the head side link 23 and the board of the tape player, and being pulled by this spring 25, the head side link 23 is attached to the engagement pin 2 of the cancel link 20.
2 and is biased in the direction of -C. A tapered portion 26 is formed at the edge of the cancel link 20 on the anti-λ1 side of the head side link 23, and this tapered portion 26
A head bin 27 that moves back and forth in conjunction with the head is movably in contact with the head. The angle of the tapered portion 2G is set so that the head side link 23 rotates counterclockwise as the head bin 27 moves forward.

Like this (17.i of this example, which determines the structure to 1)
￥ Ikawa Ruru auto loading type Arp Brae~
When inserting the pack into the back inserter, turn on the power to rotate the motor, and immediately transmit the rotation of the motor to the reel base on the take-up side, causing the reel to rotate. I use Okumu. However, the brake device is attached to the reel base on the supply side, and after the pack is loaded, the neck of the head that is attached to the tape, the pinch roller and the pushstand are crimped. ,
The brake device is released and the supply side reel base is allowed to rotate. The rotation detection plate 3 is attached to the take-up reel base of such a tape player, and the cancel link 20, the head side link 23, and the head bin 27 are linked to the rotation detection plate 3 to form the entire device. The detection prevention mechanism of this embodiment is based on the 414 configuration as in (1)) (e), and its operation will be explained next.

In the state before the pack is inserted, the head is retracted from the loading position of the arm, and the head bin 27 is also in the retracted position as shown in FIG. Therefore, the head side link 23 is not pressed by the head bin 27, and the spring 25
The cancel link 20 rotates clockwise while being pulled by the cancel link 20.
It is spaced apart from the engagement pin 22 of. Therefore, the main cell link 20 is pulled by the spring 21 and rotates in the counterclockwise direction, and its arm 20a suppresses the rotation detection plate 3 in the clockwise direction. As a result, the reel base rotates and is biased by its friction.
One branch is located on the trajectory drawn by the pin 7 of the rocking plate 6
The rotation detection plate 3 is rotated to an angle of .

In this state, when the pack is inserted into the pack insertion slot of the tape player puller 7, the power is turned on and the tray is driven.
Pack loading begins, and the reel base on the winding side begins to rotate. J3, the reel base on the supply side is locked to play #IAV 4M with J. When the pack is loaded and the shaft on the reel base side is inserted into the ill+ hole of the reel, the reel base on the supply side is locked. It is pulled and stops. Since a rotation detection plate 3 is installed on the take-up reel base, normally it would be detected as a tape end, but before the head is crimped,
As shown in FIG. 1, since the rotation detection plate 3 is rotating at the same angle as when the reel base is running, the detection of 6th 1 of "C" for each tape 1 is not detected.

Note that the amount of slack in the tape is due to the slack in the reel base on the take-up side that rotates at the same time.
However, as in the case without slack, the -y'-bend is not detected. Therefore, if there is no slack in the tape, play is started from the position when the pack was inserted, and if there is slack, play is started from the slack or the position where the tape is wound.

Immediately after the loading of the pack is completed, the head presses the tape against the tape by the driving force of the motor or other means, and as the head presses the tape, the head bin 27 advances to the left in the figure. Then, as the head bin 27 slides along the taper 26, the head side link 23 rotates counterclockwise against the force of the spring 25, and its tip engages the Jansel link 20. Press the pin 22.

As a result, the cancel link 20 is moved to the spring 2-1.
The tip of the arm 2Qa separates from the projection 3a of the rotation detection plate 3, and the rotation detection plate 3 becomes able to rotate freely. At the same time, as the head is crimped, the brake mechanism of the supply reel base is released, so the take-up reel base starts rotating. As a result, the rotation detection plate 3 freed from the canrel link 20 is
The friction of the reel base on the take-up side rotates the canrel link 20 at the same angle as in the pressed state and detects the rotation of the reel base. .

When the tape end is reached and the reel base 1 stops and turns over, the rotation detection plate 3 is released from the pressed state due to friction, and as shown in FIG. According to this embodiment, the tape end is detected by 4 degrees when it comes into contact with the protrusion 4 of the letter-shaped guide hole 5.
Even if the take-up reel base is stopped at 1.5J before the head is pressed against the tape, there is no inconvenience that the tape end is detected. Therefore, the reel base does not rotate and the tape runs until the head is crimped, and there is no disadvantage that the start position of the tape is shifted and the beginning of the song is cut off. Further, in this embodiment (1), the supply side reel base is locked in advance and the take-up side is rotated (U), so there is an advantage that slack in the tape can be taken out.

[Other Embodiment 1] Note that the present invention is not limited to the above-mentioned embodiment, and if it is not necessary to take up the slack in the i-bu, the take-up side reel base can be moved by an idler or the like until the head is crimped. It may be applied to the tape breaker 17 that cuts off the rotation.An every-turn detection plate 3 may be provided on the supply side reel base.Furthermore, the shape of the cancel link and its direction can be changed as appropriate. For example, instead of pressing the rotation detection plate 3 with the spring 21, it is also possible to press the rotation detection plate 3 with a head bin and release the pressure with the spring.
It is also possible to directly operate the head pin link 20 without having to step 3.

[Effects of the Invention] As described above, according to R-Ming Ki, the tape end detection device does not perform false detection when a pack is inserted into the tape player 17, so once the pack is inserted, it becomes a stop. This has the effect of providing a tape player that does not have the inconvenience of being ejected or having a different program from when it was inserted.

[Brief explanation of the drawing]

Figures 1 and 2 are plan views showing an example of a mechanical tape end detection device, and Figure 1 shows -i when the tape end is not detected;
Figure 2 shows the time of detection. Figures 3 and 4 are an example of the false detection prevention device 116 of the present invention! + In a plan view showing an example, the third
The figure shows the operating state, and Fig. 4 shows the non-operating state 1. ... Y-shaped guide hole, 6... Rocking plate, 7... Pin, 8... Support shaft, 9... Force l\,
10...-1-Lee, 11...Cam wheel 1 core pin,
12...Skin IJU3 cam, 13...Spring, 2
0...Cancel link, 21...Spring, 2
2... Engagement pin, 2ζ3... Head side link, 24
...Support 111.2L) ...Spring, 26...
・Part of Depa, 27...head bin. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A rotation detection plate frictionally fitted into the boss of the reel base,
A Y-shaped guide hole is formed by sandwiching the central protrusion (P).A bottle provided at one end of the swing plate is slidably fitted into this Y-shaped guide hole, and the cam follower provided with this swing plate is connected to the motor. The bin is moved by the cam on the surface of the pulley rotating by
The pulley reciprocates between the branch point of the letter-shaped guide hole and the tip of one of the branch parts, and the pulley is provided with an island-shaped cam separate from the cam on the outside of the cam, and the island-shaped cam is rocked. In a tape end detection device configured such that when the cam follower of the moving plate is driven, the pin of the swinging plate reciprocates between the presenting end of the Y-shaped guide hole and the protrusion at the branch point, A main Hunsell link is installed near the detection plate, and this cancel link is used to prevent the head from moving back and forth toward the Dave side. 1. The fact that the is rotated to the same level as when the reel base is rotating
How to prevent false detection of the 4-syllable arp end detection device. (2) A cancel link is rotatably attached to the Q-J brake ＼7, with J7 at one end engaging the rotation detection plate, and the other end J and 3 engaging the head side link, 1 (detection prevention mechanism) of the tape end detection device according to claim 1, wherein this head side link engages with a head pin that interlocks with the head.