JPS6034099Y2 - Head device for magnetic recording and reproducing equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a head device for a magnetic recording/reproduction device, and includes a device between a reproduction side terminal portion and a recording/erasing side terminal portion in each connection terminal portion of a reproduction head, a recording head, and an erasing head. At the same time, the separated terminals are reliably shielded.
This is to prevent the influence of bias current from occurring on the reproduction side.

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

Reference numeral 1 denotes a tape recorder main body, and reel stands 5 and 6, which are integrated with a reel shaft 3.4, are provided on both sides of the upper side of a rectangular front substrate 2 of the main body 1. A capstan 7 is located at the center of the substrate 2, which is on the perpendicular bisector of a straight line connecting the centers of A head block 10 is disposed on the perpendicular bisector, and a roller 11 having approximately the same height as the capstan 7 is disposed below the head block 10.

On the other hand, two tape guide pins 12 and 13 are provided between the pinch rollers 8 and 9 and slightly above the capstan 7 for guiding the running of the tape to the left and right. At symmetrical positions with respect to the perpendicular bisector, there is a substrate 2 that becomes wider toward the bottom.
Two tension rollers 16°1 which also serve to regulate the running height of the tape that can move in the long holes 14 and 15 formed in the
Further, above the tension roller 16.17, that is, on the perpendicular bisector, the roller 7 is movable up and down within the hole 18 of the substrate 2 in order to move the tension roller 16.17, and in the front-back direction. A movable tension roller operating knob 19 is also provided.

On the left side of the head block 10, that is, on the lower left side of the board 2, a control operation section 20 such as a power switch and a tape winding force changeover switch is formed. On the right side of the block 10, one of the two tape shifter pins 21 and 22 arranged in the head block 10 can be moved from side to side and back and forth within the long hole 23 of the board 2 in order to operate the shifter pin 22. A tape shifter pin operation knob 24 is provided, a tape counter 25 is provided to the right of the knob 24, and an operation switching operation section 26 is provided below these.

. Next, in FIG. 2, 28 and 29 are the reel stand 5,
6 is a reel motor attached to the board 2 with screws 30° 31, and 32 and 33 are rotatably supported on the board 2 with spindles 34 and 35 at one end, and are provided in the center. It is a brake lever in which brake shoes 36 and 37 made of leather or felt are attached to protrusions 32a and 33a, and the tips of plunger iron cores 40 and 41 of brake release plungers 38 and 39 are attached to pins 42 at the other end. .43, and in the stopped state, the brake levers 32 and 33 are rotated by return springs 44 and 45, respectively, and the brake shoes 36 and 37 are connected to the rotor 28a of the reel motor 28 and 29.
29a, and brakes the reel stands 5 and 6.

As shown in FIG. 4, one of the projecting pieces 32a and 33a is formed into an H-shape with a narrow folded part 33a1 in the center, and a brake shoe 37 is mounted horizontally around the lower projecting piece 33a2. Then, the folded part 33a□ is folded back and the lower protruding piece 33a2 and the upper protruding piece 33a3 are attached to the brake shoe 3.
By sandwiching both ends of 7, this brake shoe 3
7 is attached to the protruding piece 33a.

Note that this configuration is the same for the attachment of the brake shoe 36 on the protruding piece 32a side.

The tension roller operating knob 19 is inserted into a hole 47 of a guide plate 46 attached to the base plate 2, and is slidable up and down with elongated holes 50 and 51 being guided by pins 48 and 49 fixed on the base plate 2. It is attached by screws 53 to a substantially Y-shaped sliding plate 52 provided at Further, a protruding piece 57 is formed at a lower portion thereof to operate an operating piece 56a of a switch 56 attached to the guide plate 46 with a screw 55.

A spring 59 is suspended between the guide plate 46 and the protrusion 58 of the sliding plate 52, and the suspension position of the spring 59 is such that the protrusion 58 is located at the rear of the guide plate 46. Therefore, the sliding plate 52 is always urged upward and forward.

Tension levers 60 and 61 each have the tension rollers 16 and 17 rotatably attached to their inner free ends, and are rotatably supported by the base plate 2 with shafts 62 and 63, respectively. Balance weights 64 and 65 are provided at each end.

This tension lever 60.61 and balance weight 6
4.65 is integrally formed by die-casting or sintered alloy when the tension lever 60.61 is molded, and when the tension rollers 16 and 17 are attached, the shafts 62 and 63 are fulcrums and are static. It is structured in such a way that it is balanced.

Here, the tension rollers 16 and 17 are attached to the upper end of a shaft 70 attached to the tip of the tension lever 61, as one of them 17 is shown in FIG. Tsuba that regulates height 71.7
2 is integrally coupled with the shaft 70, and a rotary roller portion 73 is provided between the flanges 71 and 72, and is rotatably in contact with the surface of the tape T.

Grooves 74a and 74b are formed in the center of the outer periphery of the rotating roller section 73 in the circumferential direction. Especially when the tape runs at high speed, air is drawn between the tape T and the rotating roller section 73, causing the tape to vibrate. This prevents the reel from winding erratically.

The structure of the tension roller 17 section is similar to that of the tension roller 16 section.

Springs 68 and 69 are suspended between the outer ends of the tension levers 60 and 61 and pins 66 and 67 fixed to the base plate 2, respectively, and these springs 68 and 69 cause the tension lever 60 to move clockwise in FIG. Further, the tension lever 61 is biased counterclockwise, and the tension rollers 16 and 17 are located at the upper ends of the elongated holes 14 and 15 in the stopped state.

The relationship between the suspension positions of the springs 68 and 69 is as follows:
The suspension position of the tension levers 60 and 61 is located at the rear with respect to the surface of the substrate 2, and as a result, the tension levers 60 and 61 are also biased in a direction perpendicular to the direction of rotation thereof. This prevents rattling in the thrust direction at the shaft 62 and 63 parts, and the tension rollers 16 and 17
to prevent it from wobbling in the direction perpendicular to the surface of the board 2.
That is, the running height of the tape is 16.1
No. 7 is prevented from changing due to the rattling in the thrust direction.

Pins 75 and 76 are respectively fixed on the fJJ plate 52 facing the tension levers 60 and 61, and slide the tension roller operating knob 19 downward together with the sliding plate 52 against the elastic force of the spring 59. When the pin was 75.7
6 rotates the tension levers 60 and 61 counterclockwise and clockwise, respectively, against the elastic forces of the springs 68 and 69, and limits the movement range of the tension rollers 16 and 17 as shown in FIG. In this state, the tip of the locking piece 54 of the sliding plate 52 is locked to the edge of the hole 47 of the guide plate 46. It is designed to be maintained by

When the tension rollers 16, 17 are moved to the lowest position in the elongated holes 14.15, the centers of the shafts 62, 63 and the tension lever 60. Spring 6B of 61 and the line connecting the suspension position of 69
The angle α formed by the straight line connecting the suspension positions of pins 8 and 69 and pins 66 and 67 is selected to be approximately 90'.

Reference numeral 77 and 78 denote a switch attached to the board 2 with screws 79 and 80, and its operation piece 77a.

78a are operated by the balance weights 64 and 65 of the tension levers 60 and 61, respectively, and the tension rollers 16 and 17 are located at the upper ends of the elongated holes 14 and 15 as shown in FIG. Operation piece in state? 7at 78a is operated by the balance weight 64.65 to open the switch 77.78, and closes when the tension rollers 16, 17 are moved slightly downward.

Both switches 77 and 78 are connected in parallel and inserted into a series circuit between the switch 56 between the power supplies 81 and 82 and the tape running control section 83 of the tape recorder main body 1, as shown in FIG.

Note that the switch 56 is closed when the sliding plate 52 is moved upward as shown in FIG. There is.

Next, the pinch rollers 8 and 9 are attached to shafts 88 and 89 at the lower ends of pinch roller levers 86 and 87 whose central portions are rotatably mounted on the base plate 2 through shafts 84 and 85, respectively.
It is rotatably mounted with the shafts 8B, 8
9 is moved within the hole 90.91 of the substrate 2.

The upper end of the pinch roller lever 86,87 has a shaft 92.
, 93 rotatably support rollers 94, 95, and a spring 96 is suspended between the shafts 92, 93.

A bent portion of the substrate 2 is rotatably supported by a pin 100 at the center of the upper end of a driving plate 89, which is provided to be slidable up and down with a long hole 98 guided by a pin 97 fixed to the substrate 2. One end of an L-shaped lever 101 is rotatably connected by a pin 102.

A plunger iron core 104 of a plunger 103 for driving a pinch roller attached to the board is connected to the other end of the L-shaped lever 101 by a pin 105, and the drive plate 99 is connected to the plunger It is biased downward via the lever 101 by a spring 106 fitted into the iron core 104, and is located at the lower end of its movement range in a normal state.

The center portions of operating levers 109 and 110 are rotatably supported by pins 107 and 108 on both sides of the center of the drive plate 99, and the mutually opposing center portions are supported by the drive plate 9.
It is fitted into a groove 112 of a pin 111 fixed at the center of the pin 9 to prevent floating.

Projections 115 and 116 whose upper edges are inclined edges 113 and 114 are formed on the lower outer side of each of the operating levers 109 and 110, and the pinch roller levers 86 and 87 are formed on the inclined edges 113 and 114. Rollers 94 and 95 are pressed against each other from the outside.

On the other hand, a spring 119 which is much stronger than the spring 96 for pressing the pinch roller is suspended between holes 117 and 118 formed at the upper ends of the operating levers 109 and 110.
The spring 119 biases the operating lever 109 clockwise in FIG. 6 and the operating lever 110 counterclockwise using the pins 107 and 108 as fulcrums. The outer edge of the drive plate 99 is prevented from coming into contact with protrusions 120 and 121 formed on the drive plate 99 from inside.

In the holes 117, 118 of the operating levers 109, 110, on which the pinch roller pressure spring 119 is suspended,
A plurality of retaining troughs 122 and 123 are formed in the vertical direction on the inner edge to which the spring 119 is engaged, and the spring 11
The distance to the position where the pinch rollers 9 are actually applied can be changed, thereby making it possible to finely adjust the pressing force of the pinch rollers 8 and 9 due to dimensional errors of each component.

The tape shifter pins 21 and 22 are attached to shifter levers 126 and 127, one end of which is rotatably supported by pins 124 and 125 fixed to the base plate 2,
The shifter lever 126 is moved clockwise by a spring 130 suspended between the base plate 2 and the pin 66, and the shifter lever 127 is rotated clockwise by a spring 131 suspended between the pin 67 and the shifter lever 126. It is energized counterclockwise.

The projections 132 and 133 provided on the shifter levers 126 and 127, respectively, are connected to the pinch roller levers 86 and 8.
The projections 132 and 133 are pressed against the shafts 88 and 89 of the shafts 88 and 89, and the direction of the pressure contact is approximately the same direction as the straight line connecting the pressure contact portion and the shafts 84 and 85. In the normal state, the projections 132 and 133 are
89 and is rotated counterclockwise and clockwise against the elastic force of the shifter levers 126, 127 and springs 130 and 130. As a result, the shifter pin 2
1.22 are in positions moved away from each other.

Reference numeral 134 indicates a motor for driving the capstan 7, and the capstan 7, which is integrated with the rotor of the motor 134, is projected to the front side through the hole 135 of the substrate 2.

The sliding lever 136 to which the tape shifter operating knob 24 is attached has a long hole 137 inserted into the pin 1 on the board 2.
Angle 1 where 38 and tape counter 25 are attached
It is provided so as to be slidable left and right through a hole 140 provided in a vertical piece 139a of 39, and this sliding lever 13
6 is constantly biased and moved in the direction of arrow A by a spring 141 suspended between the bent piece 136a and the angle 139, and the suspended position of the bent piece 136a is positioned rearward than the suspended position of the angle 139. The one end 136b side to which the Te operation knob 24 is attached is biased forward with the pin 138 as a boundary, such as by
As a result, the one end 136b side is pressed against the edge of the hole 140.

A locking piece 142 is formed at one end 136b of the sliding lever 136, and the locking piece 142 is inclined toward the front toward the tip. Sometimes the locking piece 142 is the hole 140
The sliding state is maintained by being locked to the edge of the handle.

One end of an elastic member 143 made of a leaf spring or the like is attached to the bent piece 136a of the sliding lever 136, and the other end is in contact with the outer edge of the lower end of the pinch roller lever 87 in the normal state.

Therefore, when the sliding lever 136 is slid in the direction opposite to the arrow A, the elastic plate 143 moves towards the pinch roller lever 87.
is rotated counterclockwise in FIG.
The tape shifter pin 22 is rotated counterclockwise in FIG. 2 by the return force of 31, and the tape shifter pin 22 is moved inward.

Depending on the movement of the sliding lever 136 in this case, the pinch roller 9 will not be able to press the tape onto the capstan 7.

As shown in FIG. 11, the tape guide pins 12 and 13 have tape guide portions 12a and 13a each having a narrow diameter, and the vertical width of the tape guide portion 12a of one of the guide pins 12 is equal to the width of the tape. The tape guiding portion 13a of the other guide pin 13 has a vertical width substantially larger than the width of the tape. It is configured to only guide the running of the tape.

Next, the head block 10 will be explained. As shown in the back side of FIG.
An arcuate notch 144 is formed in the outer periphery of the lower part of the roller 11 facing each other with a slight gap, and an arcuate notch 145 is formed in the center of the lower end of the outer periphery of the upper part of the roller 11 facing each other with a slight gap and both side edges 146
, 147 is provided with a head substrate 148 formed in an arc shape along the running path of the tape and slightly covering the tape;
On the back side of this head board 148 are a 4-track playback head 149.2 a track erasing head 150.2 a track recording head 151.2 a track playback head 152.
Each head is mounted between the capstan 7 and the roller 11 so as to be located at the top of each of the substantially square shapes.

Attachment of each head to the head substrate 148 is performed in the ninth step.
As shown in the figure, one head, for example, a 4-track playback head 149, a head stand 153 integrated with the head 149 is pre-screwed with screws 155 to the head support stand 154.
156, 157 and springs 158, 159, 160 (16
0 (not shown) so that the tilt and height can be adjusted horizontally, forwards and backwards, and this head support stand 154 is attached to the head substrate 148 using screws 161 and 162.

In this way, the head 149 is attached in advance to the head support stand 154 so that its inclination can be adjusted, and the head support stand 154 is
By attaching the head to the head substrate 148, the head inclination adjustment mechanism can be assembled before being attached to the head substrate 148.
This makes installation work extremely easy.

Note that the other heads 150, 151, and 152 have a similar mounting structure.

Between the group of heads for reproduction of 4-track and 2-track reproduction heads 149 and 152 mounted above the head board 148 and the group of heads for recording of 2-track erasing and recording heads 150 and 151 mounted below. A shield plate 16 for shielding between both head groups.
3 is attached to the head substrate 148 with screws 164.

The lower end of this shield plate 163 is bent in the erasing/recording head 150, 151 direction and then further bent downward, and the vertical pieces 163a, 163b are provided with screws 165, 1.
Printed circuit boards 167 and 168 to which head connection terminals are wired are attached by 66.

A changeover switch 174 for selecting the use of a 4-track playback head 149 or a 2-track playback head 152 is attached to the center of the back surface of the head board 148, and a tape guide pin 212 is mounted to the upper right portion of the back surface (as viewed from the front).
is erected facing downward.

In the head block 10 configured in this way, the notch 144 of the head substrate 148 is connected to the capstan 7 as described above.
Three pillars are located on the outer periphery of the lower part and in such a way that the cutout part 145 faces the outer periphery of the upper part of the roller 11 with a slight gap between them, and the lower ends are fixed to the base plate 2 with screws 202, 203, and 204. The capstan 7 and roller 11 are connected to the capstan 7 and roller 11 by screws 169° 170.
It is installed at almost the same height as the

Particularly, as shown in FIG. 10, the support column 205 is formed with a tape guide portion 211 having a narrow diameter and approximately the same width as the tape. It contacts the guide portion 211 and is guided, and its running height position is regulated.

Further, the tape guide pin 212 fixed on the head board 148 is also formed with a narrow tape guide part 213 having a width approximately equal to the width of the tape, and the tape from the head 152 to the capstan 7 is guided by this tape. Guide section 213
It contacts and is guided, and its running height position is regulated.

Note that when the head block 10 is attached to the substrate 2, the terminals 172a, 1 provided on the main body 1 side
The terminals 72b sandwich the printed circuit board 167 and are electrically connected to the head connection terminals, and the terminals 173a and 173b sandwich the printed circuit board 168 and are electrically connected to the head connection terminals.

In this case, the printed circuit boards 167 and 168 are fitted into a recess 175 formed in the board 2, and both printed circuit boards 167 and 168 are shield pieces that are integrally formed to protrude from the center of the bottom surface of the recess 175 to the front surface. 176, a reproduction side printed circuit board 167, a recording side printed circuit board 168 through which a bias current flows, and terminals 172a, 17.
2b and 173a and 173b are each shielded.

Note that the terminals 172a, 172b are integrated with the terminal housing 177, and the terminals 173a, 173b are integrated with the terminal housing 178, and are inserted through the holes 179, 180 of the recess 175.

The roller 11, which does not regulate the running height of the tape, is rotatably supported by bearings 183a and 183b on a shaft 182 fixed at the bottom of a recess 181 protruding from the back surface of the substrate 2, and its outer periphery A plurality of grooves 184 are formed in the circumferential direction in the tape guiding portion, and a belt hook portion 185 is formed in the lower portion.

Note that a recess 18 formed in the center of the head of this roller 11
6 is fitted with a non-rotating portion 187.

The belt hook of the roller 11 is formed between a part 185 and a boot IJ 189 which is rotatably supported by a shaft 188 fixed on the base plate 2, and is opposed to the bottom edge of the recessed part 181.
A belt 192 is passed through one of the two holes 190 and 191, and the pulley 189
The belt 1 is also connected between a small diameter pulley (not shown) formed on the front side of the tape counter 25 and the pulley 193 of the tape counter 25.
94 is applied, and the tape counter 25 is driven by the rotation of the roller 11.

Here, to explain in detail the front shape of the board, it includes the part where the reel stands 5 and 6 are located, the tension roller 16.17, the tape guide pin 12.13, the capstan 7, the pinch roller 8°9, and the head block. 10, a front portion 195 along the tape running path where rollers 11, etc. are located is a control operation section 20, and a tape shifter operation knob 24.
, the front surface is formed slightly higher than the front surface portion 196 where the tape counter 25, the operation switching operation section 26, the level meter 27, etc. are located, and the front surface portion 197 where the capstan 7, head block 10, roller 11 is located. The head block 19 is formed higher than the front surface portion 195 in an area larger than the tape winding portion, that is, slightly outward from the tape running path.
the center of both sides of the capstan 7 and roller 11
At the central part between the tape shifter pins 21 and 22, there are boxes 198a and 1 having the same height as the front part 197.
98b is formed.

On the other hand, recesses 19 are provided in the portion where the control operation unit 20 is located, as well as the portion where the tape shifter pin operation knob 24, tape counter 25, and tension roller operation knob 19 are located.
9, 200, 201 are formed, and each operation knob 20at 20bt 20ct of this control operation section 20 is formed.
20dt 20es Also, the tape shifter pin operation knob 24, counter return knob 25a1, tension roller operation knob 19, etc. have recesses 199 and 200, respectively.
, 201, and has a height such that its head surface does not protrude at least from the tape running surface.

On the other hand, the level meter 27 and the operation switching operation section 26 appear on almost the same surface as the front portion 196, that is, below the tape running surface.

Of course, these may also be provided in a recess formed in the front portion 196, as long as they do not protrude beyond the tape running surface.

It has the above configuration, and the operation will be described next.

First, in the stopped state, as shown in FIGS. 1 and 2, the brakes are applied to the reel stands 5 and 6 by the springs 44 and 45 that press the brake shoes 36 and 37 against the rotors 28a and 29a of the reel motor. It is being hung.

Further, the tension rollers 16 and 17 are located at the upper ends of the elongated holes 14 and 15 due to the urging force of the springs 6B and 69.
Therefore, the switches 77 and 78 are open and the switch 56 is closed, so the operation switching operation section'! Even if 6 is operated, the tape running control section 83 is not energized and the device is not brought into operation.

Furthermore, the pinch rollers 8, 9 are biased outwardly away from the capstan 7 with equal force by a spring 96, and thereby the tape shifter pins 21, 22
are moved outward by springs 130 and 131, respectively.

In this state, before applying the tape, the tension roller operating knob 19 is moved downward against the elastic force of the spring 59.

At the same time, the sliding plate 52 moves downward, and the pin 7
5.76 comes into contact with the tension levers 60 and 61 and rotates them counterclockwise and clockwise in FIG. 2 against the elastic force of springs 68 and 69, respectively, as shown in FIG. Then, the tension rollers 16, 17 are moved downward along the elongated holes 14, 15, and the distance between the rollers 16, 17 is increased, making it easier to apply the tape.

The downwardly moved state of the tension rollers 16 and 17 is maintained by the tip of the locking piece 54 of the sliding plate 52 being engaged with the front edge of the hole 47 formed in the guide plate 46.

On the other hand, when the sliding plate 52 begins to slide downward, the switch 5
6 is opened, and when the tension levers 60 and 61 begin to rotate counterclockwise and clockwise, respectively, the switches 77 and 78 are closed, and even in this state, it is still impossible to energize the tape running control section 83. It becomes.

With the tension rollers 16 and 17 moved in this manner, the reels R□ and R2 are mounted on the reel stands 5 and 6.
For example, the tip of the tape T wound around the reel R1 is first passed between the tension rollers 16 and 17, and applied to the rotating roller section of one of the tension rollers 16, and then passed between the tape guide pins 12 and 13. After passing it through the tape guide portion 12a of one of the tape guide pins 12, passing it between the capstan 7 and the pinch roller 8,
Furthermore, the left side of the head block 10 is passed through the tape guide portion 211 of the support column 205, the tape is wound around the roller 11, and the tape guide pin 2 is passed through the head block 10 portion again.
12 and is passed between the capstan 7 and the pinch roller 9.

Thereafter, the tape T is placed on the tape guide portion 13a of the tape guide pin 13, passed between the tension rollers 16 and 17, placed on the rotating roller portion 73 of the tension roller 17, and wound around the other reel R2.

When the tape T has been applied, manually move the reels R1 and R2 onto the reel stands 5 and 6 to avoid slack in the tape between the reel R1 and the tension roller 16, between the reel R2 and the tension roller 17, or below the roller 11. The tape T is rotated against the brake force and the tension roller 16
．． 17, tape is id pin 12, 13, 212 pillar 20
5, so that the tape can be applied accurately to the tape guide section 211, roller 11, etc.

When the tape T has been applied in this way, the tension roller operating knob 19 is pushed backward to release the lock of the sliding plate 52.

That is, when the tension roller operating knob 19 is pressed backward, the upper end of the sliding plate 52 moves backward against the elastic force of the spring 59, so that the tip of the locking piece 54 does not engage with the edge of the hole 47. The sliding plate 52 returns upward due to the restoring force of the spring 59 and returns to its original position shown in FIGS. 1 and 2.

This return of the sliding plate 52 releases the pressing rotation of the tension lever 60.61 by the pin 75.76, so that
In FIG. 2, the tension levers 60 and 61 are about to be rotated clockwise and counterclockwise by the return forces of the springs 6B and 69, respectively, but the tension rollers 16 and 1
7 is moved downward, the tape T is applied without slack, and the reel stands 5 and 6 are braked, so the tension rollers 16 and 17 are hardly moved upward, so The tension levers 60 and 61 also remain rotated counterclockwise and clockwise.

In this case, when the tape T has some slack and the sliding plate 52 is unlocked, the tension levers 60, 6
1 is rotated by the return force of the springs 68, 69, and when the tension roller 16.17 is moved to the upper end of the elongated hole 14.15, the tension roller 16, 17 is switched by the rotation of the reel R1, R2. 77, 78 so that it is moved downward until at least one of them is switched.

Of course, if the tape T is slack and at least one of the tension rollers 16 and 17 is not completely moved to the upper end of the elongated hole 14 or 15, there is no need for the above-mentioned re-operation.

Here, during the operation of applying the tape T, the control operation section 20
The heads of the operation knobs 20a to 20e, the tape shifter pin operation knob 24, and the counter return knob 25a.
1 The heads of the tension roller operation knobs 19, the level meter 27, and the front surfaces of the operation switching operation unit 26 are located below the running surface of the tape T, so when applying the tape T, the knobs and other There is no chance of the tape getting caught on the parts, and the tape application operation can be performed extremely easily and smoothly.

On the other hand, at the time of this operation, the tension rollers 16 and 17 are also moved downward, so that they are somewhat separated from the reels R□ and R2, and since the distance between the rollers 16 and 17 is wide, the tape T is inserted between them. It is also easy to perform the threading operation.

When the tape T has finished being applied, the tape shifter pins 21 and 22 are located outside the tape running path, so the tape T does not come into contact with any of the heads 149 to 152.

In the above state, the switch 56 is closed, and both or one of the switches 77 and 78 are closed, so that the tape running control section 83 can be energized.

Next, a case will be described in which a reproduction operation is performed from the state in which the tape T is loaded as described above.

To perform this regeneration operation, among the operation switching operation sections 26,
Operate the operation section for starting playback operation.

Then, the brake release plungers 38 and 39, the plunger 103, and the reel motors 28 and 29 are energized.

First, by energizing the brake release plunger 38.39, the brake lever 32.33 spring 44.4
The brake shoes 36 and 37 are rotated clockwise and counterclockwise, respectively, against the elastic force of the reel motors 28 and 29, and the brake shoes 36 and 37 are separated from the rotors 28a and 29a of the reel motors 28 and 29, releasing the brakes on the reel stand 5.6. , also plunger 103
When the lever 1 is energized as shown in FIG.
01 rotates counterclockwise, and the drive plate 99 is moved upward.

By moving the driving plate 99 upward, the actuating lever 109
, 110 are also moved upward, the rollers 94, 95 of the pinch roller levers 86, 87 ride on the inclined edges 113, 114 of the protrusions 115, 116, thereby causing the pinch roller lever 86 to move upward in FIG. The pinch roller lever 87 is rotated clockwise, and the pinch rollers 8, 9 are brought into contact with the rotating capstan 7 via the tape T.

In this case, even if the pinch rollers 8 and 9 are brought into contact with the capstan 7, the drive plate 99 and the operating levers 109 and 11
0 is moved upward, and the pinch roller levers 86 and 87 are still rotated slightly, so that the difference between the elastic force of the spring 119 and the elastic force of the spring 96 causes the pinch roller 8, The pressure contact force is 9, and the pressure contact forces are approximately equal.

Since the rotation of the pinch roller levers 86 and 87 releases the pressing rotation of the shifter levers 126 and 127, the shifter levers 126 and 127 are moved clockwise and downward by the return forces of the springs 130 and 131, respectively, as shown in FIG. The shifter pins 21, 22 are both moved toward each other in the counterclockwise direction, until now heads 149--
The tape T that had been separated from the heads 152
Contact ~152.

Then, a very small voltage is supplied to the reel motor 28 on the tape supply side to apply pack tension to the tape T, and the reel motor 29 on the tape winding side controls the reel R.
2 to wind up the tape T, and the capstan motor 134 rotates the capstan 7 in the direction of arrow B as shown in FIG. It is done.

The running height of the tape T is determined by the collar (not shown) of the tension roller 16, and then by the tape guide portion 12a of the tape guide pin 12. The height of the tape portion entering the pinch roller 8 is determined, and then the head 149,
150, the tape guide portion 211 of the support post 205 determines the height at which the tape is wound around the roller 11, and the tape guide portion 213 of the tape guide pin 212 determines the height between the capstan 7 and the pinch roller 9. After being determined and subsequently guided by the tape guide portion 13a of the tape guide pin 13, the collar R2 of the tension roller 17 is
The height of the winding is determined.

Therefore, the tape T as a whole always runs smoothly at a predetermined running height and with tension that pushes down the tension rollers 16, 17 to approximately the middle position between the elongated holes 14, 15 as shown in FIG.

The tape T in constant speed tape running during this playback operation
Pressure is applied to the heads 149 to 152 by applying tape tension as follows.

That is, the two pinch rollers 8 and 9 are connected to the capstan 7.
and the center of the roller 11, and the centers of the pinch rollers 8 and 9 are located symmetrically with respect to the straight line, and the pinch rollers 8 and 9 are arranged symmetrically with respect to the straight line. Pressed and pinch roller lever 8
A straight line m connecting the center of the pinch rollers 8 and 9 and the center of the capstan 7 with respect to a straight line l connecting the center of the shaft 84.85 which is the rotational fulcrum of 6.87 and the center of each pinch roller 8 and 9. The angle β formed by the angle β is set to be an obtuse angle.

With this configuration, the arrow B of the capstan 7
With respect to the rotation in this direction, the pinch roller 8 rotates in the escape direction, and the pinch roller 9 rotates in the self-injection direction. Since the roller 8 rotates with almost constant sliding relative to the capstan 7, even though the tape is driven around the outer periphery of one capstan 7, the rear side movement by the capstan 7 and the pinch roller 9 is caused by the tape T running. The running speed of the tape drive section is faster than that of the tape drive section on the front side formed by the capstan 7 and the pinch roller 8.

For this reason, a constant tension is always applied to the tape T between the two tape drive sections, and this tension causes the tape T to run while being in reliable pressure contact with the heads 149 to 152.

In addition, in this case, since the tape T is wrapped around the outer periphery of the roller 11 with a certain tension, and the wrapping angle is extremely large, approximately 180°, the roller 11
Since the roller 11 is rotated without slipping relative to the tape T, the rotation of the roller 11 reliably follows the running of the tape T, and the tape counter 25 displays an accurate tape running amount, and the roller 11 is rotated without slipping. Since the rotational speed is constant regardless of the amount of tape winding of the bars R□ and R2, accurate tape running time can be displayed.

Here, to explain in more detail the tape tension obtained by the one capstan 7 and the two pinch rollers 8 and 9, first, there is a relationship between the pressing force of the pinch roller against the capstan and the speed of the tape driven therebetween. If we consider, for example, the pressing force of the pinch roller is 1
When the pressure force is set to 1 kg and the pressure is changed based on this value, the tape speed changes as shown in FIG.

Under such changes, the tape speed difference that occurs between the capstan 7 and the pinch roller 8, and between the capstan 7 and the pinch roller 9, and the heads 149 to 1
Examining the relationship between the wow and flutter that occurs on the tape T at the 52 section, we can see that the capstan 7 and the pinch roller 8
When the tape drive speed of the capstan 7 and pinch roller 9 is increased in the positive direction based on the tape drive speed of It increases rapidly, and high performance cannot be obtained.

On the other hand, regarding only wow and flutter, if the speed difference is selected so that it is in the negative direction, that is, the tape drive speed of the front tape drive section formed by the capstan 7 and the pinch roller 8 is set to Even if the tape drive speed is selected to be faster than the tape drive speed of the rear tape drive unit, the tape T will run without slack, but in the meantime the tape T will have some tension due to the back tension from reels R□ and R2 and the tape winding force. Although this is obtained, the tape running becomes extremely unstable, and implementation is impossible due to level fluctuations and other problems.

Under these conditions, the ratio n of the tape drive speed based on the rotation of the pinch roller 8 in the pinching direction with respect to the capstan 7 and the tape drive speed based on the rotation of the pinch roller 9 in the biting direction with respect to the capstan 7 is determined. 1≧n≧0.
997.

When the regeneration operation is stopped, the brake release plungers 38 and 39 and the plunger 103 are de-energized, and the reel motors 28 and 29 are de-energized, so the brake levers 32 and 33 are moved by the spring 44. , 45, the brake shoes 36.37 are brought into pressure contact with the rotors 28a*29a of the reel motors 28, 29, and the brakes are applied to the reel stand 5.6 while the spring 106
The drive plate 99 moves downward via the lever 101, and the operating levers 109 and 110 also move back and rotate due to the return force of the pinch roller levers 86 and 87 and the springs 96.
The pinch rollers 8 and 9 are separated from the capstan 7, and the running of the tape T is stopped.

On the other hand, the pinch roller levers 86 and 87 are rotated against the elastic force of the shifter levers 126 and 127 and the springs 130 and 131, and the shifter pins 21 and 22 are moved outward to move the tape T to the head 149. ~152, and enters the stopped state shown in FIGS. 1 and 2.

Next, let's talk about tape fast forwarding and rewinding operations.

First, the tape fast-forward operation is performed by operating the fast-forward operation section of the operation switching operation section 26 with the tape T being applied.

When this fast-forwarding operation section is operated, the brake release plungers 38 and 39 and one reel motor 29 are energized, and the brakes of the reel stands 5 and 6 are released, and at the same time, the reel motor 29 rotates and the reel stand 6 and the brakes are released. The reel R2 is rotated, and the tape T is run at high speed in the direction of arrow C, as in the reproduction operation.

In this case, the tape shifter pins 21 and 22 receive a large tension from the tape T, but that force is applied to the shifter lever 126.
．． From the projecting pieces 132 and 133 of 127, this and the pins 88 and 8
Since the pinch roller levers 86 and 87 act in substantially the same direction as the straight line connecting the pressure contact portion of 9 and the shafts 84 and 85, the tension levers 126 and 127 do not rotate, and the tape T is pulled away from the head. ing.

On the other hand, the tape rewinding operation is performed by operating the rewinding operation section of the operation switching operation section 26, and the brake release plungers 38, 39 and the reel motor 28 are energized.

As a result, the reel stand 5 is rotated clockwise when viewed from the front, and the tape T is moved at high speed in the opposite direction to the arrow C in FIG. 14 while being separated from the head, similar to fast forwarding.

To stop the tape fast-forwarding or rewinding operation, operate the stop operation section of the operation switching operation section to cut off the power to the brake release plungers 38 and 39, respectively, and turn off the power to the reel motor 29 or 28. The reel motors 29 and 28 are braked, and the tape T is stopped from running.

In this case, when the stop operation is performed, the reel motors 28 and 29 may be temporarily energized to electrically stop the rotation of the motors.

When this fast forwarding or rewinding operation is stopped, if for some reason the tape T becomes slack between both reels R□ and R2 and the tape protrudes from the normal tape running path, first Or, when slack occurs between the reel R2 and the tension roller 17, even if the tape T slacks up to the control operation section 20, level meter 27 section, tape shifter operation knob 24, tape counter 25, or operation switching operation section 26, Since both heads are located below the tape running surface, the tape T will not get caught on the control operation part 20 or the operation knob 24, etc., especially when the main body 1 is used vertically, and the reel R operation will not occur. , R2 can easily return the tape to its original state.

On the other hand, if the tape T sag below the capstan 7, especially when the main body 1 is used horizontally, the tape will be higher than the front part 195, which is higher than the front part 196, to the slightly outer side of the tape running path. Front part 197 and box 1 formed in a very small gap with the running surface
98a and 198b prevent the tape T from falling significantly from the running road surface, and since it is placed at a position only slightly offset from the running road surface, it is very easy to reapply the tape normally. .

If the tape T becomes slack, the reel R
Since the front part 195 of the R2 part is formed higher than the front part 196, the gap between the R2 part and the front part 195 is small, so that the slack tape can enter the gap. Things will disappear.

When the tape shifter pin operating knob 24 is operated to the left in FIG. The pinch roller lever 87 is rotated counterclockwise in FIG. 2 against the elastic force of the spring 96, and the pinch roller 9 is moved in the direction of the capstan 7.

The rotation of the pinch roller lever 87 releases the pressed state of the shifter lever 127, so the shifter lever 127
The return force of the spring 131 causes the tape shifter pin 22 to rotate counterclockwise in FIG. 2, thereby moving the tape shifter pin 22 inward and bringing the tape T into contact with the heads 151 and 152.

The moving state of the tape shifter pin 22 is maintained by the tip of the locking piece 142 of the sliding lever 136 being locked with the edge of the hole 140 of the angle 139, and in this state, the pinch roller 9 is held by the capstan. 7 is not in pressure contact, and the fast forwarding and rewinding operations of the tape T are not affected.

When the tape T is brought into contact with the heads 151, 152 in the tape fast-forward or rewind state, playback is performed by the tape high-speed feeding operation, and a cue operation and review for finding the recording start position on the tape T, etc. It is something that can be moved.

In this cue operation and review operation, the pinch roller 8 and tape shifter pin 21 are at the stop position, and the tape T is run away from the heads 149 and 150.

The moving state of the tape shifter pin 22 is returned by pushing the operation knob 24 against the elastic force of the spring 141.

That is, when the operating knob 24 is pushed in, the sliding lever 136
The one end 136b side rotates rearward to disengage the locking piece 142, and the sliding lever 136 returns to its original stop position due to the return force of the spring 141, thereby locking the pinch roller lever 87 and the shifter lever. 127 tJ, the tape shifter pin 22 moves outward to pull the tape T away from the heads 151, 152.

Note that this operation of bringing the tape T into contact only with the heads 151 and 152 can be performed even when the tape T is not running. Therefore, when the cue or review operation is stopped, the recording start position of the tape can be determined while monitoring with the head 152. It is also possible to accurately set the recording start position, tape cutting position, etc. by slightly rotating both the wheels R1f and R2 left and right to align the positions.

In the tape fast forwarding and rewinding operations described above, the tape T is run while being wound around the outer periphery of the roller 11 by approximately 180 degrees, so in this case as well, the roller 11 is
In this case, especially since grooves 184 are formed on the outer periphery of the roller 11, even if air is drawn in between the roller 11 and the tape T, the air will be absorbed by the grooves 184. This eliminates the possibility of slippage occurring due to the formation of an air layer between the roller 11 and the tape portion.
Therefore, the rotation of the roller 11 reliably follows the running of the tape T, and the tape counter 25 accurately displays the tape running amount or running time.

Note that the number of grooves 184 may be one or more.

This also applies to tension rollers.

If a large tension is applied to the tape T when stopping the above playback operation, fast forwarding, rewinding operation, etc., the tension roller 1
6.17 has the following operation.

That is, the biasing wings 68, 69 of the tension levers 60, 61 supporting the tension rollers 16, 17 are arranged so that the tension rollers 16, 17 are connected to the elongated holes 14,
15, the center of the shaft 62.63 and its tension lever 60.6, as shown in FIG.
By selecting the angle α between the line connecting the suspension positions of the springs 6B and 69 of No. 1 to approximately 90° between the suspension position of the spring 68 and 69 and the straight line connecting the pin 66 and 67, the tension lever 60 and 61 are The lever 60 when rotated counterclockwise and clockwise from the position shown in FIG.
The spring force acting on the spring 61 gradually increases in an accelerated manner, and when the tension lever 61, 62 is fully rotated, the distance from the shafts 62, 63 to the acting direction of the springs 6B, 69 becomes maximum. As the tension roller 16,17 is moved downward in the elongated hole 14,15, the rotational load moment also increases at an accelerating rate.

Therefore, large changes in the tension of the tape T can be sufficiently followed by the tension rollers 16, 17 within a small movement range.

In the above embodiment, the shield piece 176 was formed integrally with the substrate 2, but it may be provided as a separate member.

As is clear from the above embodiments, the present invention includes a playback head, a recording head, an erasing head, a head substrate to which each of the heads is attached, a substrate of the device main body to which the head substrate is attached, and the head to which the head is to be erased. Connection terminals for each of the heads attached to the substrate and terminals electrically connected to the connection terminals for the heads are provided, and a bias current does not flow through the head connection terminals and the terminals connected thereto. The playback head side and the recording head and erasing head sides through which bias current flows are separated, and a shield piece protruding from the device main body side is used to separate the playback head side terminal section and the recording and erasing side terminal section. According to this invention, the playback side terminal where the bias current does not flow and the recording erase side terminal where the bias current flows are reliably shielded by the shield piece, so that the playback head cannot be used during recording. When monitoring the recorded content, bias current will not be mixed into the playback head.

Therefore, there is no problem even if the playback side terminal part and the recording erase side terminal part are arranged adjacent to each other, and if the shield piece is molded integrally with the board as in the embodiment, it can be used as a special member. There is no need to manufacture or install the same, and it can be implemented at low cost, so its practicality is great.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show one embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is an internal view of the same, Fig. 3 is a sectional view, and Fig. 4 is a perspective view of the brake lever. 5 is a cross-sectional side view of the tension roller section, FIG. 6 is a front view of the pinch roller operating section, FIG. 7 is a cross-sectional side view of the tape shifter operation knob, and FIG. 8 is a back view of the head lock. Figure 9 is a front view showing the head installation part, Figure 10 is an exploded perspective view of the head block installation part, Figure 11 is a cross-sectional side view of the tape id pin part, and Figure 1
Figure 2 is a power supply control circuit diagram, Figure 13 is a front view of the tension roller in a moved state, Figure 14 is a front view of the regenerated state, Figure 15 is an internal view of the same, and Figure 16 is a diagram of the pinch roller pressure force. FIG. 17 is a diagram showing the change in tape speed, and is a diagram showing the relationship between wow and flutter with respect to the difference in tape speed. 2... Board, 148... Head board,
149-152...Head, 167.168.
...Printed circuit board, 172a, 172b, 173
a, 173b...terminal, 176...shield piece.

Claims (1)

[Scope of utility model registration request] A playback head, a recording head, an erasing head, a head board to which each of the above heads is attached, a board of the device main body to which this head board is attached, and connection terminals for each of the above heads attached to the head board. and a terminal electrically connected to the connection terminal of the head, the playback head side through which the bias current does not flow and the recording head through which the bias current flows between the head connection terminal and the terminal connected to the head connection terminal. , a head device of a magnetic recording/reproducing device, which is separated into an erasing head side, and shields between the differentiated reproduction head side terminal portion and recording/erasing side terminal portion by a shield piece protruding from the device main body side. .