JPS582409B2 - Tape recorder auto reverse touch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a magnetic head for one channel, and switches its height position in two stages to perform recording and playback in a two-channel system. The present invention relates to an auto-reversing device for a tape recorder that separately adjusts the inclination in the left and right height directions at a low position.

Conventionally, tape recorders that use a tape cassette in which two-channel magnetic tape is wound between a pair of reels,
The tape feed direction is constant, and when recording or playback of one channel is completed, the cassette must be turned over to start recording or playback of the other channel, and it is extremely difficult to automate this operation.

Therefore, when recording and playback of one channel is finished,
A so-called auto-reverse device has been devised that detects the end of the tape and dynamically switches the tape feeding direction so that recording and playback of the other channel can be performed continuously.

Furthermore, the inventor considered using an inexpensive one-channel magnetic head and switching the height position in two stages when changing the running direction of the tape.

On the other hand, in order to maintain good contact with the tape surface, the magnetic head needs to be able to adjust its tilt in the left and right height directions. If so, it must be possible to make the above adjustments at any height.

This invention was made in view of these points,
The height position of the magnetic head can be switched in two stages to enable recording and playback in a 2-channel system using a 1-channel head, and the inclination of the magnetic head in the left-right height direction at each height position can be adjusted. It is an object of the present invention to provide an auto-reversing device for a tape recorder that can perform each reversing operation separately and maintain good contact between the magnetic head and the tape surface at any height position.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows a plan view of the tape recorder, with the board 1
Cassette loading sections 2, 2 into which a tape cassette is inserted from the front end are provided on the left and right sides of the upper front surface of a, and a pair of reel shafts 3, 3 are disposed between the loading sections 2, 2.

Furthermore, capstan shafts 4, 4 are disposed at the front positions of the respective reel shafts 3, 3;
The reel shafts 3, 3 are mounted on a drive board 1b disposed on the lower surface side of the board 1a.

The driving board 1b moves upward in conjunction with the loading operation of the tape cassette, and along with this, the reel shaft 3,
3 is inserted into the tape reel of the tape cassette from below.

A 1-channel, 2-track magnetic head 5 is mounted at the center of the upper surface of the substrate 1a via an operating plate 6.

The magnetic head 5 is vertically symmetrical with respect to the core.

Further, a pair of tape guides 7, 7 and a pair of vinyl rollers 8, 8 are provided on both sides of the magnetic head 5.

The tape guides 7, 7 are movable forward and backward through supports 9, 9 fixed to the upper surface of the substrate 1a,
The Vinci rollers 8, 8 are rotatably supported at respective ends of support arms 10, 10 rotatably mounted on the upper surface of the substrate 1a.

Each support arm 10,10 is rotationally biased in a direction that presses a Vinci roller 8,8 against a respective capstan shaft 4,4.

A motor 11 and a small gear 12 mounted on the drive board 1b are disposed at a rear position on the upper surface of the board 1a.

Further, an auxiliary board 1c is mounted parallel to the board 1a at a rear position on the upper surface of the board 1a, and an intermediate rotating body, that is, a dog gear 13, is rotatably mounted on the back side of the auxiliary board 1c.

As shown in FIGS. 2 to 4, this large gear 13 has rest portions 14.14 in which several teeth are missing at two symmetrical locations, and an annular rib 15 is provided protruding from the upper surface. A height cam 16 is formed on a part of the outside of the rib 15.

The height cam 16 has a high portion 16a at the center, and taper portions 16b, 16b inclined along the circumferential direction on both sides.

Further, a circular eccentric cam 17 is formed at the center of the upper surface.

Furthermore, locking portions 18, 18 are provided protrudingly at two symmetrical locations on the inner surface of the rib 15.

An engagement shaft 19a is provided at an eccentric position on the lower surface of the dog gear 13.
is provided protrudingly, and a roller 19 is rotatably mounted on this shaft.

Various operating levers 20 are attached to the front end of the board 1 so as to be movable forward and backward.

FIG. 5 shows the drive mechanism mounted on the drive board 1b, in which reference numeral 21 denotes a motor pulley attached to the motor shaft 22;
23, 23 are flywheels attached to each capsun shaft 4, 4; 24 is an intermediate pulley attached to the small gear 12; 25;
, 25 are reel stands on which the respective reel shafts 3, 3 are mounted via friction mechanisms.

Reference numeral 26 denotes an idler pulley that selectively presses against each of the flywheels 23, 23, and this idler pulley 26 is rotatably connected to the rotating end of a swinging lever 27 whose one end is rotatably supported on the drive board 1b. It is installed.

The central shaft 28 of the idler pulley 26 projects upward,
Switching pulleys 29, 29 are arranged between the central shaft 28 and each reel stand 25, 25, respectively.

The switching pulleys 29, 29 are provided with a switching lever 30, which is attached to a left-right symmetrical position on the drive board 1b so as to be movable forward and backward.
It is rotatably supported on one end of 30.

The switching levers 30, 30 are always urged forward.

The motor pulley 21 and the intermediate pulley 24 are rotationally connected via an endless belt 31, and the intermediate pulley 24-
and one flywheel 23 are rotationally connected via an endless belt 32.

Further, the other flywheel 23 is pressed into contact with the endless belt 32 from the outside, so that both flywheels 23, 2
3, that is, both capsun shafts 4, 4 rotate simultaneously at the same speed but in different directions.

FIG. 6 shows the pinch roller operating mechanism that moves the pinch rollers 8, 8 toward and away from the capstan shafts 4, 4. In the figure, reference numeral 33 has a long hole 34 in the center, and both ends are connected to tape guides 7. , 7 is an interlocking lever located below the detection lever 33 and mounted on the upper surface of the board 1a so as to be movable forward and backward.

The detection lever 33 is rotatably supported in its elongated hole 34 and can be moved back and forth in the front and rear directions, and a pressing piece 36 for pressing the front end of the interlocking lever 35 is cut downward and formed at the center of the front edge. ing.

A contact piece 37 is provided protruding from the front end side of the interlocking lever 35,
The tip of the manual switching operation lever 20a faces this contact piece 37.

Further, an L-shaped hole 38 is formed in the center of the interlocking lever 35.

Reference numeral 39 in the figure is a locking lever for controlling the rotation of the canine gear 13, whose middle part is rotatably attached to the back side of the auxiliary board 1C, and whose one end is inserted into the elongated hole 34 of the interlocking lever 35. It has a locking pin 40 that locks at the other end, and a locking pin 41 that locks at the locking portion 18 of the dog gear 13 at the other end.

This locking pin 41 always locks the dog gear 13 at a position where one of the resting portions 14 corresponds to the small gear 12 .

Further, reference numeral 42 in the figure is an actuation lever for actuating the pinch rollers 8, 8, whose center portion is rotatably supported on the base plate 1a, and a pair of left and right actuating arms 43.43 are connected to the support arm 10.10 of the pinch rollers. The tips are opposed from the front, and one of the support arms is selectively pulled away from the capstan shaft 4.

Further, a connecting arm 44 extending rearward is located on the lower surface side of the canine gear 13, and a cam hole 45 provided in this arm 44 is provided.
A roller 19 attached to the lower surface of the dog gear 13 is inserted into the canine gear 13.

Now, when the tape guide 7.7 moves rearward, it pushes the detection lever 33 and the interlocking lever 35 in the same direction, and the locking lever 39 that engages with the L-shaped hole 38 moves in the non-biasing direction. The lock pin 41 of the lock lever 39 comes to be disengaged from the lock portion 18 of the dog gear 13.

Then, the operating lever 42 is rotationally biased by the return force of the support arm 10 that has been separated from the capsun shaft 4, and the operating lever 42 and the canine gear 13 are engaged with each other through the cam hole 45 and the roller 19. Therefore, the canine gear 13 rotates slightly in the direction of the arrow in the figure due to the restoring force of the support arm 10, and rotates while meshing with the small gear 12, which is constantly rotating.

When the other half rotates, the other resting part 14 is disengaged from the small gear 12, and the other locking part 1
8 is locked by the locking pin 41 and held in a stopped state again.

During the above operation, the operating lever 42 rotates in conjunction with the rotation of the canine gear 13, and its operating arms 43, 43 separate the pinch roller 8, which is in pressure contact with the capstan shaft 4, from the capstan shaft 4. , the pinch roller 8 in the separated position is brought into pressure contact with the capsun shaft 4.

7 to 10 show the attachment part of the magnetic head 5. In the figures, 46 is a bracket fixed to the upper surface of the substrate 1a, and 47 is a U-shaped joint, and this joint 47 has both sides moved forward. The bottom end is attached to the bracket 47 via a machine screw 58 so as to be rotatable in the left and right directions.

The lower edge of the bottom piece of the joint 47 has a bent piece 48 facing forward.
A compression coil spring 49 is inserted between the bent piece 48 and the substrate 1a, and a lower adjustment screw 50 is inserted from above into the center of the bent piece 48, and the screw 50 is inserted into the substrate 1a. It is screwed into the screw hole drilled in the.

On the other hand, a magnetic head 5 is attached to the lower surface of one end of the actuating plate 6.

The operating plate 6 has both rear end edges bent downward to form a U-shape, and the U-shaped portion 6a is fitted between both sides of the joint 47.

A support shaft 51 is inserted between both sides of the joint 47, and the actuating plate 6 is rotatable in the vertical direction about the support shaft 51.

Further, one side edge of the actuating plate 6 is bent downward from a position slightly behind the magnetic head mounting portion to the rear end, and the actuating plate 6 is bent downward between the front end of the bent piece 52 and the substrate 1a. A tension spring 53 biased in the direction is tensioned.

Further, the actuating plate 6 connects the middle part of the other side edge to the canine gear 13.
A screw hole is provided in the extending portion, and a machine screw 55 is screwed into the screw hole from the upper surface side via a compression coil spring 54.

The lower end of this machine screw 55 comes into elastic contact with the upper surface of the dog gear 13 due to the action of the tension spring 53, and the height cam 1
selectively slides into contact with 6.

A pair of studs 56, 56 are provided upright on both sides of the magnetic head 5 on the upper surface of the substrate 1a.
Height adjustment screws 57, 57 are screwed into the upper ends of the .

These adjusting screws 57, 57 lightly touch both edges of the front end of the actuating plate 6, and prevent the actuating plate 6 from swinging in the left-right direction. The amount of movement in that direction is regulated.

Therefore, the actuating plate 6 operates as follows.

That is, the machine screw 55 is connected to the height cam 16 of the upper surface of the dog gear 13.
When the actuating plate 6, that is, the magnetic head 5 is in the low position shown in FIGS. When the dog gear 13 slides on the upper surface of the dog gear 13 and rotates half a turn, the machine screw 55 rises along the tapered part 16b and comes into contact with the high part 16a of the height cam 16.

At this time, the actuating plate 6 rotates upward about the support shaft 51, and positions the magnetic head 5 at a high position as shown in FIG.

When the magnetic head 5 is in a low position, the operating plate 16 is adjusted by rotating the low adjustment screw 50.
It can be rotated horizontally and vertically around the center.

That is, when the adjusting screw 50 is tightened, the actuating plate 6 moves to the joint 47.
The adjustment screw 5 is rotated clockwise in FIG.
When 0 is loosened, the return force of the spring 49 causes it to rotate counterclockwise.

This makes it possible to adjust the inclination of the magnetic head 5 in the horizontal and horizontal height directions.

Further, when the magnetic head 5 is in the high position, the inclination of the magnetic head 5 in the horizontal height direction can be adjusted by adjusting the tightening of the left and right height adjustment screws 57, 57.

Note that since the actuating plate 6 rotates around the support shaft 51,
The vertical movement of the magnetic head 5 is a circular arc movement.

However, if the radius of rotation is made sufficiently long compared to the width of rotation, that is, if the actuating plate 6 is made long, the vertical movement of the magnetic head 5 can be approximately regarded as vertical movement.
There is no problem in practical use.

However, in this embodiment, the accuracy is further improved.

That is, the magnetic head 5 is adjusted so that there is no inclination in the front-rear direction when it is in a low position, and when it is rotated to a high position, the actuating plate 6 moves into the so-called neck part between the magnetic head mounting part and the bending piece 52. 59, thereby compensating for the inclination of the magnetic head 5 in the longitudinal direction.

FIG. 11 shows the positional relationship between the magnetic head 5 and the magnetic tape 61 in the tape cassette 60. The magnetic head 5 moves between the solid line position (low position) and the chain line position (high position) in the cassette 60. It moves up and down to record and reproduce two tracks on the lower and upper halves of the magnetic tape 61, respectively.

In addition, 62 in the figure is a pad spring.

FIG. 12 shows the operating portion of the polarity reversal switch 63 for switching the left and right tracks of the magnetic head 5. In FIG.

That is, the changeover switch 63 is arranged at the rear end of the top surface of the board 1, with its changeover knob 64 facing forward, and one end of a rotary lever 65 whose central portion is rotatably mounted on the bottom surface of the auxiliary board 1C. The switching knob 64 is held between the two.

The other end of the rotating lever 65 grips the eccentric cam 1T of the dog gear 13.

Therefore, the rotary lever 65 rotates back and forth in conjunction with the rotation of the canine gear 13, and the changeover switch 63 is operated every time the canine gear 13 makes a half rotation.

As shown in FIG. 13, this changeover switch 63 is interposed between the magnetic head 5 and the left and right amplifiers AMP1, AMP2, and each amplifier AMP, AMP2 is connected to a speaker SP1, respectively.
Connected to SP2.

The changeover switch 63 has a pair of movable contacts S1182 connected to each amplifier AMP1, AMP2, one movable contact S, connects to fixed contacts a1, b1, and the other movable contact s2 connects to fixed contacts a2, b2. Switch selectively and in conjunction with each other.

The fixed contacts a1 and b2 are connected to one coil C1 of the magnetic head 5, and the fixed contacts a2 and b1 are connected to the other coil C2 of the magnetic head 5.

Therefore, as shown in the figure, the movable contact s1 is connected to the fixed contact a.
1 and the movable contact s2 is connected to the fixed contact a2, one coil C1 of the magnetic head 5 is connected to one (left) speaker SP1 via AMP1, and the other coil C2 is connected to AMP2. to the other (right side) speaker SP2.

Then, when the switching knob 64 is switched and the movable contact s1 is connected to the fixed contact b1 and the movable contact s2 is connected to the fixed contact b2, one coil C of the magnetic head 5 is connected to the other (right side) via the AMP2. The coil C2 is connected to the speaker SP2, and the other coil C2 is connected to one (left) speaker SP1 via the AMP1.

Next, the operation of this embodiment will be explained.

First, when the tape cassette 60 is loaded into the cassette loading section 2, the motor 1 is connected to the power source in response to this loading operation, and the motor 1 is started.

At this time, assuming that the upper surface of the canine gear 13, which is symmetrical to the height cam 16, is in contact with the machine screw 55 and the magnetic head 5 is in a low position, the operating lever 42 is rotated to the left. The right pinch roller 8 is separated from the capstan shaft 4, the left pinch roller 8 is pressed against the capstan shaft 4, and the magnetic tape 61 is fed from right to left.

The left reel shaft 3 is rotated by the rotational force of the right capstan shaft that does not contribute to tape running, that is, the rotational force of the right flywheel 23, and winds the tape onto the left reel.

Further, the magnetic head 5 is in sliding contact with the lower half of the magnetic tape 61,
The changeover switch 63 is located at the position shown by the chain line in FIG. 12, and connects the movable contacts s, , s2 to the fixed contacts a1, a2, respectively, so that the upper coil C1 of the magnetic head 5 is connected to the left speaker SP1, and the lower coil is connected to the left speaker SP1. C2 is the right speaker SP2
For example, a playback operation is performed by connecting to the .

Further, a pair of tape guides 7, 7 enter the cassette 60 from both sides of the magnetic head 5, press against the magnetic tape 61, and regulate the height position of the tape 61.

The magnetic tape 61 is placed on the feeding direction side with the magnetic head 5 as a boundary,
In other words, the tension on the left side is strong, so the left tape guide T is pushed back a little, and the detection lever 33 pivoted behind it is tilted slightly to the right.

When all the tape is wound on the left reel and there is no more tape on the right reel, the tape tension increases rapidly because the end of the tape is attached to the reel, and this tape tension causes the detection lever to 33 and the interlocking lever 35 move rearward.

When the locking lever 39 that engages with the interlocking lever 35 rotates to release the lock on the canine gear 13, the canine gear 13 is moved in the direction of the right pinch roller cab stun shaft 4 via the operating lever 42. Due to the return force, it rotates slightly in the direction of the arrow in FIG. 6 and meshes with the small gear 12.

Therefore, the canine gear 13 rotates by half a rotation due to the rotational force of the pinion 12, stops rotating when the next stop portion 14 corresponds to the pinion 12, and is locked again at the stop position by the locking lever 39.

While the canine gear 13 rotates half a rotation, the actuating lever 42 rotates to the right to press the right pinch roller 8 against the capstan shaft 4 and move the left pinch roller 8 away from the capstan shaft 4. Pull it apart (Figure 6).

Then, in conjunction with the forward rotation of the support arm 10 that supports the right pinch roller 8, the right switching lever 30 moves forward, causing the right switching pulley 29 to switch between the right reel and the right switching pulley 29. The idler pulley 26 is inserted into a wedge shape between the stand 25 and the center shaft 28 of the idler pulley 26, and the idler pulley 26 is pressed against the left flywheel 23, so that the idler pulley 26 is connected from the left flywheel 23 to the right reel shaft 3. form a rotation transmission path to the

Further, the height cam 16 of the dog gear 13 pushes up the operating plate 6 via the machine screw 55, and pushes up the magnetic head 5 to a height where the operating plate 6 comes into contact with the heads 57a, 57a of the height adjusting screws 57, 57. .

Furthermore, the rotary lever 65 rotates to the right, and the changeover switch 63 is operated (as shown by the solid line in FIG. 12).

Therefore, as the dog gear 13 makes a half turn, the magnetic head 5 moves to a higher position and the tape feeding and winding direction switches from left to right, and the coil C1 above the magnetic head 5 moves. The lower coil C2 is connected to the right speaker SP2 via the contact s2, and the lower coil C2 is connected to the left speaker SP via the movable contact s1, so that a predetermined reproduction operation is performed continuously. .

As detailed above, according to the present invention, the joint part is pivotally attached to the board so as to rotate on a plane perpendicular to the board surface on which the tape attachment part of the board is provided, and An actuating plate having a cam abutting portion is pivotally mounted so as to rotate on a plane perpendicular to both the base plate surface and the rotating surface of the joint portion, and a rotary plate is attached to the rotating end of the actuating plate. By mounting a channel magnetic head, providing a cam having a high setting part and a low setting part, and bringing the high setting part or the low setting part into contact with the cam contact part depending on the running direction of the tape,
The height position of the magnetic head from the substrate surface is switched between two levels, high and low, and an actuating plate biasing spring urges the actuating plate in a direction in which the cam contact portion is always brought into contact with the cam, and the joint The joint part is biased in one direction by the bias spring,
When the magnetic head is in the low position, the azimuth is adjusted by the low adjustment screw provided between the board and the joint, and the high adjustment screw is directly or indirectly screwed into the board to adjust the azimuth of the actuating plate. When the cam contact portion contacts the high setting portion of the cam on both sides of the tip, the head of the height adjustment screw restricts the rotation of the actuating plate in the direction opposite to the substrate, so that the magnetic head is placed at a high position. Since the azimuth adjustment is made when the magnetic head is in either the high or low position, it is possible to independently perform sophisticated azimuth adjustment based on the substrate, and the contact state of the magnetic head with the tape surface can be adjusted independently. Therefore, it is possible to provide an auto-reverse device for a tape recorder that can maintain the tape recorder well at any height position.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a plan view, Fig. 2 is a plan view of a dog gear, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a cross-sectional view of the canine gear. 5 is a plan view showing the drive mechanism, FIG. 6 is a plan view showing the pinch roller operating mechanism, and FIG. 7 is a side view partially cut away showing the magnetic head mounting part. Figure 8 is the front view of the same, Figure 9 is the rear view of the same,
0 is a side view of the same, FIG. 11 is a partially cutaway side view showing the positional relationship between the magnetic head and the magnetic tape, FIG. 12 is a plan view showing the actuating part of the polarity reversal switch, and FIG. The figure is an electrical circuit diagram. 4...capsun shaft, 5...magnetic head, 8...pinch roller, 50...
Low adjustment screw, 57...High adjustment screw, 61.
·····Magnetic tape.

Claims (1)

[Claims] 1 A board having a tape attachment part, a joint part pivotally attached to the board so as to rotate on a plane perpendicular to the board surface on which the tape attachment part of this board is provided, and a cam contact part. an actuating plate pivotally attached to the joint part so as to rotate on a plane perpendicular to both the substrate surface and the rotating plane of the joint part; and an actuating plate attached to the rotating end of the actuating plate. 1-channel magnetic head, and a high-level setting part and a low-level setting part, and the high-level setting part or the low-level setting part is brought into contact with the cam abutting part depending on the running direction of the tape, and the magnetic head is moved from the substrate surface of the magnetic head. a cam that switches the height position of the cam to two levels, high and low; an actuating plate biasing spring that biases the actuating plate in a direction in which the cam abutting portion is always brought into contact with the cam; and an actuating plate biasing spring that biases the joint portion in one direction. A joint biasing spring, a low adjustment screw that is interposed between the substrate and the joint and adjusts the azimuth when the magnetic head is in a low position, and a low adjustment screw that is connected directly or indirectly to the substrate on both sides of the tip of the actuating plate. The azimuth adjustment when the magnetic head is at a high position is achieved by using the head to restrict the rotation of the actuating plate in the direction opposite to the substrate when the cam contact part contacts the high setting part of the cam. 1. An auto-reverse device for a tape recorder, characterized in that it is equipped with a height adjustment screw for adjusting the height of the tape recorder.