JPS642281Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an auto-reversing tape recorder, and more specifically, it uses an erasing head made of a permanent magnet, and has a simple configuration that allows the tape to be erased in each direction according to the tape running direction. The present invention relates to a control mechanism for an auto-reverse tape recorder in which a corresponding erasing head is brought into contact with a magnetic tape.

A large number of tape running direction switching control mechanisms for auto-reversing tape recorders have been proposed in the past, and since small devices in particular use batteries, power consumption must be kept as low as possible. As a countermeasure to this problem, a direct current erasing method using a permanent magnet is often used instead of an alternating current erasing method that requires an erasing current for erasing during recording.

This direct current erasing method using permanent magnets is advantageous in terms of cost because it does not require an electric circuit, but if the erasing head touches the magnetic tape in a mode other than recording mode, it may accidentally erase the magnetic tape. Therefore, the erasing head must be brought into contact with the magnetic tape only in the recording mode, and must be set back from the magnetic tape in other modes. Also,
In an auto-reverse tape recorder, even when recording, it must be switched and controlled so that only the erasing head corresponding to the track to be recorded comes into contact with the magnetic tape, so the configuration is complicated, especially for small equipment. It has been extremely difficult to use the above-mentioned technology.

The present invention has been made to solve these problems, and one embodiment of the auto-reverse tape recorder of the present invention will be described in detail below with reference to the drawings.

Each figure shows an embodiment of the tape recorder of the present invention. In each figure, 1 is a fixed chassis, and on the fixed chassis 1 are left and right reel stands 2L, 2R each having a gear formed on its outer periphery, and mutually connected to each other. Left and right capstans 3L and 3R rotating in opposite directions
are arranged, and pinch roller levers 4L, 4R are rotatably equipped with pinch rollers PL, PR at one end facing the capstans 3L, 3R, and engagement arms 41L, 41R are formed at the other end. It is arranged so that it can rotate freely. In addition, the pinch rollers PL and PR are inside the pinch roller levers 4L and 4R.
Springs 6L and 6R are arranged to press the capstans 3L and 3R into contact with each other.

Reference numeral 7 denotes a movable chassis, which is arranged so as to be slidable back and forth, that is, up and down in the figure, by means of pins 1a, 1b, 1c on the fixed chassis 1 and their elongated holes 7a, 7b, 7c. It looks like it's leaning backwards. On the movable chassis 7 is a recording/playback head that can run the tape in the forward and reverse directions.
RPH is arranged, and on both sides there are erase head plates 9L and 9L on which permanent magnet erasure heads EL and ER are mounted, respectively.
9R is arranged to be vertically slidable by engaging two pins 91L, 91L, 91R, 91R provided on the lower surface thereof into elongated holes 71L, 71R on the movable chassis 7, and springs 10L, 10
It is always biased rearward on the movable chassis 7 by R.

On the other hand, a pinch roller lever 4L,
Engagement part 72 that engages with springs 6L and 6R in 4R
L, 72R are formed, which causes the pinch roller lever 4 to move up and down as the movable chassis 7 moves up and down.
L and 4R can also be rotated up and down via springs 6L and 6R.

Further, on the side edge of the movable chassis 7 above the engaging portions 72L, 72R, an idler lever 12L, which will be described later, is provided.
Slopes 73L and 73R are formed to engage with the engagement portions 121L and 121R at the tip of the tip 12R.

An idler lever 12L is rotatably provided on the outside of the reel stands 2L and 2R with idler gears 11L and 11R that mesh with the gears of the reel stands 2L and 2R, respectively, and transmit rotational force from a drive source (not shown) thereto. 12R is rotatably attached around shafts 13L and 13R, and engagement portions 121L and 121R are formed at the tips thereof to engage with slopes 73L and 73R on the side edges of the movable chassis 7. On its side, there is a rotating lever 15 which will be described later.
Engagement arms 122L, 122R that engage with L, 15R
are formed, respectively, and are rotationally biased counterclockwise and clockwise, respectively, by springs 14L and 14R, that is, toward the reel stands 2L and 2R, respectively.

On the other hand, idler levers 12L, 1 are placed on the fixed chassis 1 outside the pinch roller levers 4L, 4R.
Engagement protrusions 151L, 151R that engage with 2R, engagement arms 41L, 4 of pinch roller levers 4L, 4R
Engagement protrusions 152L, 152 for engaging with 1R
R, rotary levers 15L, 15R formed with engaging protrusions 153L, 153R for engaging with a switching control lever 17, which will be described later, are rotatably arranged around shafts 16L, 16R.

Below the movable chassis 7, a switching control lever 17 that is selectively operated left and right to switch the tape running direction in conjunction with a tape running direction switching means (not shown) connects its elongated holes 17a and 17b to the pins on the fixed chassis 1. 1d and 1e so as to be slidable left and right, and on its front edge there are engagement protrusions 153L and 153R for the left and right rotating levers 15L and 15R.
Engagement slope 1 for engaging with and controlling rotation thereof
71L and 171R are formed.

Further, an erasing head control plate 18 for controlling the erasing heads EL and ER is attached to the pin 74 on the lower surface of the movable chassis 7 so as to be rotatable and slidable left and right through its elongated hole 18a. spring 19
The erase head plates 9L and 9R are always rotated to the left and counterclockwise by the
Engagement slope 181 that engages with pins 91L and 91R of
L, 181R are formed, and furthermore, a pin 1 provided at approximately the center of the switching control lever 17 is formed on the lower edge.
A substantially U-shaped engaging portion 182 that engages with the portion 72 is formed.

A recording lever 20 with a recording button R attached to one end is attached to the lower side of the erasing head control plate 18 so as to be slidable back and forth. A pin 20a is provided which engages and controls the rotation.

The tape recorder of the present invention has the above-mentioned structure, and its operation will be explained in detail next.

FIG. 1 shows a stopped state, in which the drive mechanism (not shown) is in a stopped state, and the capstans 3L, 3
R and idlers 11L and 11R are stopped.

The movable chassis 7 is also moved backward by the elasticity of the spring 8, the recording head RPH is also separated from the magnetic tape T, and the pinch roller levers 4a, 4b are also separated from the capstans 3L, 3R.

On the other hand, the switching control lever 17 is in a state where it has been slid to the left in the figure, and has been switched to a tape forward running state, which will be described in detail later. Therefore, the rotating lever 15L has its engagement protrusion 153L.
is in a state where it has climbed onto the engagement slope 171L and rotated counterclockwise, and the rotation lever 15R is in a state where its engagement protrusion 153R has separated from the engagement slope 153R and rotated counterclockwise. .

In addition, the engaging portions 121L, 121R at the ends of the idler levers 12L, 12R ride on the engaging slopes 73L, 73R of the movable chassis 7, so that the idler levers 12L, 12R rotate outward against the springs 14L, 14R, respectively. The idler gear 11L,
Both reel stands 11R are spaced apart from the reel stands 2L and 2R.

Pinch roller levers 4L and 4R also have springs 6L and 6.
It is retreating backwards via R, and capstan 3
The pinch rollers PL and PR are spaced apart from L and 3R.

Also, since the recording lever 20 has not been operated and is in a retracted state, the erase head control plate 18 spring 1
The head plate 9 is rotated counterclockwise around the right end of the elongated hole 18a by the elasticity of the head plate 9, and the upper edge including the engaging slopes 181L and 181R
The erasing heads EL and ER are spaced apart from both the pins 91L and 91R of L and 9R, and as a result, both the erasing heads EL and ER are in a state of retreating backward on the movable chassis 7 by the springs 10L and 10R.

In this state, a play button (not shown) is operated to operate a drive mechanism (not shown) to rotate the capstans 3L and 3R clockwise and counterclockwise, respectively, and move the movable chassis 7 in the direction of the magnetic tape T. , and the forward direction play state as shown in FIG. 2 is reached.

That is, when the movable chassis 7 moves forward in the stopped state shown in FIG.
When the RPH contacts the magnetic tape T, the pinch roller levers 4L and 4R are also rotated toward the capstans 3L and 3R via the springs 6L and 6R.

However, in Fig. 1, the rotating lever 15R
is rotated counterclockwise, so both the engaging protrusions 151R and 152R are connected to the idler lever 1.
2R engagement arm 122R, pinch roller lever 4R
Eventually, the idler lever 12R is rotated clockwise by the spring 14R, meshing the idler gear 11R with the reel stand 2R, and rotating it counterclockwise. The roller lever 4R also rotates to pinch and press the magnetic tape T against the capstan 3R with its pinch roller PR, thereby transporting the magnetic tape T to the right.

On the other hand, since the rotating lever 15L is rotating counterclockwise, its engaging protrusion 151L holds the idler lever 12L against the spring 14L so that the idler gear 11L does not mesh with the reel stand 2L. , the pinch roller lever 4L is held in a state where the pinch roller PL is separated from the capstan 3L by the engaging protrusion 152L.
This allows the tape to run in the forward direction.

Also, the erasing head control board 18 is connected to the recording lever 2.
0 has not been operated, so the erase head is rotated counterclockwise as in Figure 1.
Both EL and ER are located at the rear, separated from the magnetic tape T, so that the magnetic tape T will not be erased by mistake.

In this state, by operating the recording lever 20, or by simultaneously operating the play button (not shown) and the recording lever 20 in the state shown in FIG. 1, the tape forward recording state is established as shown in FIG. be able to.

The positions of the left and right idler levers 12L, 12R, pinch roller levers 4L, 4R, switching control lever 17, etc. are the same as in the state shown in FIG. Erase head control board 1 with pin 20a
By pushing the free end of 8 forward and rotating it clockwise against the spring 19, the front edges forming the engagement slopes 181L and 181R are removed, and the pins 91L and 91R of the head plates 9L and 9R are removed. and is brought to a position where it can engage. Since the erasing head control plate 18 is interlocked with the switching control lever 17 by its engaging portion 182, it is in a state of being moved to the left as shown in the figure. Therefore, the pin 91L of the erasing head plate 9L rides on the engagement slope 181L, and the erasing head is attached to the magnetic tape T.
The pin 91R of the erasing head plate 9R moves forward against the spring 10L to abut the EL, and the pin 91R of the erasing head plate 9R reaches the engagement slope 181R.
The erasing head ER is now in a more detached state and is held at a position spaced apart from the magnetic tape T. Through the above operations, a tape forward recording state is obtained.

In this state, when the tape reaches the end, or by operating the tape running direction switching button (not shown) and operating the tape running direction switching mechanism (not shown), the switching control lever 17 is slid to the right, and the switching control lever 17 is moved to the right. The erasing head control plate 18 also moves to the right to enter the tape reverse recording state as shown in FIG.

By moving the switching control lever 17 to the right,
The rotating lever 15L has its engagement protrusion 153L disengaged from the engagement slope 171L and rotates clockwise, and the rotation lever 15R has its engagement protrusion 153R climbing onto the engagement slope 171R and rotates clockwise. move. As a result, the idler lever 12L is rotated counterclockwise by the spring 14L, and the idler gear 11L is engaged with the reel stand 2L to rotate it clockwise, and the pinch roller lever 4L is rotated by the spring 6L. Then, by rotating counterclockwise, the pinch roller PL pinches the magnetic tape T and presses it against the capstan 3L, which is rotating clockwise.

Further, the idler lever 12R has its engagement arm 12
2R is pressed by the engagement protrusion 151R of the rotating lever 15R and rotates counterclockwise against the spring 14R, separating the idler gear 11R from the reel stand 2R, while the pinch roller lever 4R is also released from its engagement. The joint arm 41R is pressed by the engagement protrusion 152R and rotated counterclockwise against the spring 6R, thereby separating the pinch roller PR from the capstan 3R.

Through the above operations, the tape is transferred to the left.

Furthermore, as the erasing head control plate 18 moves to the right in conjunction with the right movement of the switching control lever 17, the erasing head plate 9
The L pin 91L disengages from the engagement slope 181L and moves backward by the spring 10L, and the pin 91R of the erasing head plate 9R rides on the engagement slope 181R and slides forward against the spring 10R. Then, it comes into contact with the magnetic tape T.

This provides a tape reverse recording condition.

As described above, according to the auto-reversing tape recorder of the present invention, the recording/reproducing head, etc. are mounted, and the left and right erasing heads are moved forward and backward, respectively, on a movable chassis that is arranged so as to be able to slide forward and backward relative to the magnetic tape. In addition to being movable, an erasing head control plate is provided in conjunction with the recording lever to selectively advance the erasing head and bring it into contact with the magnetic tape in accordance with the switching operation of the tape running direction. The erase head is brought to a position where it can engage with each of the erase heads only when the lever is operated, and is configured so that none of the erase heads comes into contact with the magnetic tape in modes other than the recording mode. Therefore, even if a direct current erasing method using permanent magnets is used, the erasing head can contact only the track to be recorded according to the tape running direction, and the magnetic tape will never be erased by mistake. , the operation that controls the erase head,
This is done in conjunction with the tape running direction switching means, so there is no need to provide a separate special control means for the erasing head, and its configuration can be significantly simplified, and the cost can also be significantly reduced in terms of the number of parts. It is possible, and the effect is great.

[Brief explanation of drawings]

Each figure is an explanatory view of the configuration and operation of an embodiment of the auto-reversing tape recorder of the present invention, in which Figure 1 shows the stopped state, Figure 2 shows the tape playing in the forward direction, and Figure 3 shows the tape in the forward direction. Recording status, 4th
The figures each show the state of tape recording in the reverse direction. Explanation of symbols, 1...Fixed chassis, 4L, 4R
... Pinch roller lever, 7 ... Movable chassis,
9L, 9R... Erasing head plate, 11L, 11R...
...Idler gear, 12L, 12R...Idler lever, 15L, 15R...Rotating lever, 17...
Switching control lever, 18... Erasing head control board, 2
0...Record lever, EL, ER...Erase head.

Claims (1)

[Scope of utility model registration request] Left and right reel stands on a fixed chassis, an idler mechanism that selectively transmits rotational force to the reel stands, left and right capstans that rotate in opposite directions, left and right pinch rollers that are provided opposite each of the capstans, and tape forward and reverse. A switching control lever is provided with a movable chassis on which a magnetic head is placed for performing recording and playback in the tape running direction, and selectively switches the pinch roller and idler mechanism to create forward and reverse tape running states according to the tape running direction. In an auto-reversing tape recorder having an auto-reversing tape recorder, a pair of erasing heads corresponding to each tape running direction are provided on the movable chassis so as to be able to move toward and away from the magnetic tape, and are interlocked with the switching control lever to move the erasing heads in the tape running direction. By providing an erasing head control plate in conjunction with the operation of the recording lever, which operates to selectively bring the corresponding erasing head into contact with the magnetic tape, the erasing head can be moved in the direction of tape travel only when the recording lever is operated. The erasing head control plate is controlled so that the erasing head can be selectively operated according to the recording lever, and when the recording lever is not operated, any erasing head is held in a position where it does not come into contact with the magnetic tape. An auto-reverse tape recorder characterized by having the following configuration.