JPH0628085B2 - Head and pinch roller holding mechanism - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversible magnetic recording / reproducing apparatus equipped with a head / pinch roller holding mechanism that can be used in a microcassette or the like.

2. Description of the Related Art In recent years, there have been remarkable developments in miniaturization of micro-cassettes and long-term recording / playback technologies. In particular, for long-time recording / playback, in addition to the technology for slowing down the tape running, a technology for automatically reversing the running direction of the tape has come into wide use. Therefore, a reversible head / pinch roller holding mechanism is required to be small in size and simple, and to have a stable forward / backward tape running.

The conventional reversible microcassette magnetic recording / reproducing apparatus has a side cap stun system in which two capstans are arranged on both sides of the microcassette.

The head / pinch roller holding mechanism of the above-described conventional reversible magnetic recording / reproducing apparatus will be described below with reference to the drawings.

FIG. 6, FIG. 7 and FIG. 8 are plan views of essential parts showing a reversible magnetic recording / reproducing apparatus using a conventional microcassette in a stopped state and an inverted state.

1 is a substrate, 2 is a forward rotation capstan, and a forward rotation gear 3,
The forward rotation flywheel 4 is concentrically and integrally provided. A reversing capstan 5 has a reversing gear 6 and a reversing flywheel 7 concentrically and integrally. Rotation of the motor 9 in the counterclockwise direction is transmitted to the forward and reverse flywheels 4 and 7 through the belt 8, the forward rotation flywheel 4 is rotated clockwise, and the reversal flywheel is rotated counterclockwise. It has become so. Reference numeral 10 is a forward rotation take-up reel stand, and 13 is a reversal take-up reel stand, which are rotationally transmitted by a flywheel. A forward rotation head substrate 16 has a forward rotation head 16a mounted thereon, has pins 17, and is slidable by a shaft 18 of the substrate 1 and a long hole (not shown) in the substrate 1 for guiding the pins 17 It is provided in. A reversing head substrate 19 has a reversing head 19a mounted thereon, has pins 20, and is slidable by a shaft 21 of the substrate 1 and a long hole (not shown) in the substrate for guiding the pins 20. It is provided. Reference numeral 29 is a forward rotation pinch roller lever, which is swingably provided on a shaft 30 and has a forward rotation pinch roller 31 and a pressure contact spring 32. A reversing pinch roller lever 33 is swingably provided on the shaft 34, and has a reversing pinch roller 35 and a pressure contact spring 36.

The operation of the conventional reversible magnetic recording / reproducing apparatus configured as described above will be described below.

First, when the forward rotation mode is operated from the stopped state shown in FIG. 7, the rotation is transmitted from the forward rotation flywheel 2 to the forward rotation take-up reel base 11 by a known means, and the forward rotation pinch roller lever 29 is moved. The pressure contact spring 32 is operated, the forward rotation pinch roller 31 is pressed against the forward rotation capstan 2,
Rotate the magnetic tape in the microcassette in the forward direction (C direction)
Drive to. Further, the forward rotation head substrate 16 also has a spring 37.
Then, it is slid in the direction of arrow B, and the state shown in FIG. 8 is reached. The normal rotation head 16a is brought into contact with the magnetic tape to perform the reproducing operation. At this time, the reversing head substrate 19 is also slid in the direction of the arrow B, but is controlled by the pin 20 and separated from the magnetic tape. Further, the reversing pinch roller lever 33 is separated from the reversing capstan to perform a forward constant speed traveling operation.

Next, the reverse constant speed traveling operation will be described. When the forward / reverse switching means is operated from the normal rotation constant speed traveling operation state shown in FIG. 8, rotation is transmitted from the reverse flywheel 7 to the reverse take-up reel stand 14 as shown in FIG. 9, and the reverse pinch roller 3 is used.
5 is pressed against the reversing capstan 5 and runs the magnetic tape in the microcassette in the reversing direction (D direction). Further, the reversing head substrate 19 is also slid in the direction of arrow B by the spring 37, and the reversing head 19a is brought into contact with the magnetic tape to perform a reproducing operation. At this time, the forward rotation head substrate 1
6 also slides in the direction of arrow B, but controls pin 17 to separate it from the magnetic tape. Further, the forward rotation pinch roller lever 29 is separated from the forward rotation capstan 2 to perform reverse constant speed traveling.

Problems to be Solved by the Invention However, in the above-mentioned configuration, since two flywheels are required, a large space is taken, and further, there are two head substrates, a forward rotation head substrate and a reversal head substrate. In addition, since a biasing member for the substrate side of the head substrate is required, the structure becomes complicated, and the number of parts and the number of assembling steps increase.

The present invention solves the above-mentioned problems, the size and weight of the entire apparatus can be greatly reduced, and the number of parts and the number of assembling steps can be reduced by a simple structure, and the tape running performance is not impaired. A head / pinch roller holding mechanism for a magnetic recording / reproducing apparatus is provided.

Means for Solving the Problems In order to solve the above problems, a head / pinch roller holding mechanism of the present invention includes a capstan, a pinch roller that can be crimped to the capstan, and normal recording or normal reproduction or normal reproduction. It is provided with a first magnetic head that is pressed against the magnetic tape in the first mode such as the inverted cue review, and a second magnetic head that is pressed into contact with the magnetic tape in the second mode such as the reverse recording or the reverse reproduction or the reverse cue review. , Further arranging a pinch roller in the center, and placing both heads of the first magnetic head and the second magnetic head symmetrically across the pinch roller to allow sliding and rotation on the substrate. A head substrate is provided, and a fulcrum that slides and rotates on the head substrate is arranged on a center line passing through the center of the pinch roller and in a direction opposite to the capstan side from the rotation center of the pinch roller, Further, an urging member for urging the head substrate in the capstan direction from the pinch roller, a first position for stopping in the first mode by a forward / reverse switching operation, and a second position for stopping in the second mode. A head switching member that moves to the position of, a first magnetic head of the head substrate, the first engaging portion engageable with the head switching member, and a head substrate of the second magnetic head. A biasing member for biasing the head substrate toward the substrate, and a sliding member under the head substrate at one end of the biasing member. And a fulcrum that pivots, a guide part that slides and pivots on the substrate at the other end, and a protrusion that projects toward the substrate near the center of both ends, and the head substrate is in the retracted position. At this time, the protrusion of the above bias spring falls and the head substrate is biased toward the substrate side. When the head substrate is in the forward position, the protrusion of the biasing spring does not fall and strengthens the substrate force that biases the head substrate toward the substrate side, and the head substrate rotates left and right in the forward position. Also has a configuration in which a deformed hole of the substrate whose urging force does not change is provided.

Operation The present invention can easily configure the center capstan system using one flywheel by the above-mentioned configuration, and can construct the head substrate on which the forward and reverse heads are mounted by one sheet, and The configuration of the apparatus can be greatly simplified, and the size can be further reduced, such that a single biasing member that biases the head substrate toward the substrate can be configured. Further, since the biasing force does not fluctuate even when the head substrate is rotated to the left or right along with the forward / reverse switching operation of the head substrate, the magnetic tape can be surely driven to run.

Embodiment Hereinafter, a head / pinch roller holding mechanism according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a stopped state of a head / pinch roller holding mechanism in an embodiment of the present invention, FIG. 2 is a side view of a main part thereof, and FIG. 3 is an assembly sketch thereof. In FIG. 1, reference numeral 51 is a microcassette, 52 is a main substrate, 53 is a capstan, which concentrically and integrally have a gear and flywheel (not shown), and power is transmitted from a motor to the flywheel via a belt, The gear is an intermediate gear etc. for normal rotation,
Rotation is transmitted to the forward winding reel base 54 or the reverse winding reel base 55 via the friction mechanism while selecting the normal rotation and reverse rotation modes to the reverse winding reel base respectively, and the magnetic tape 56 in the micro cassette 51. To wind up.
Reference numeral 57 denotes an upper substrate mounted on the upper portion of the main substrate 52 with a space such as a rod and a lever. Reference numeral 58 is a head substrate, and 59 is a head spacer integrally attached to the head substrate 58.
1 is mounted, has a pin 62, and is slidably and rotatably provided by a long hole 57a of the upper substrate 57. 6
A pinch roller 3 is rotatably provided on a shaft 64 planted in the head spacer 59, and can be pressed against the capstan 53 by sliding the head substrate 58. 6
Reference numeral 4 is a reproduction rod slidable on the main substrate 52 and a reproduction button 6
5, and has a torsion spring 66.

A head spacer 59 is provided at one end of the torsion spring 66.
Of the magnetic tape pressing force of the forward rotation head 60 and the reversing head 61 by the sliding of the reproducing rod 64 and the capstan 53 of the pinch roller 63.
The crimping force of Further, the reproducing rod 64 is provided with an engaging portion capable of engaging with the bend 58a of the head substrate 58.

67 is a head switching rod and 68 is a pin thereof. The head switching rod 67 is provided with a pin 69 on the main board and an elongated hole 70 slidably on the guide, and one end thereof has a tension spring 71 attached to the main board 52. The other end is attached and biased in the direction in which the head switching rod 67 is slid. Reference numeral 72 denotes a forward / reverse switching button, which allows the guide portion 73 of the main substrate 52 to slide on the guide and engages with the head switching rod, and is urged to be connected to each other by a tension spring 74. Further, the head switching rod 67 has a claw 67a that can be locked and engaged with the lock pin 75 that can slide on the main substrate 52, and the forward / reverse switching button 72 can be engaged with the lock pin 75 and that of the head switching rod 67. Inclined portion 7 for releasing the lock engagement of the lock claw 67a
2a is attached. Further, the head switching rod 67 has an inclined portion 6 which can be engaged with the pins 76 and 77 of the head substrate.
7b and 67c are formed, and when the head substrate 58 is in the retracted position, the pins 76 and 77 are horizontally restricted by the irregular holes (not shown) of the upper substrate, the head substrate 58 is in the forward position, and the forward / reverse switching button is in the A position. When the forward / reverse switching button is at the B position, the reversing head 61 is restricted from entering when the forward rotation head 60 enters.
Regulate the entry of.

In FIG. 2, the pin 62 of the head substrate 58 penetrates the long hole 57a of the upper substrate 57, and one end of the pin 62 is attached to the other end of the leaf spring 78 attached to the guide portion 57b of the upper substrate 57. Between the head substrate 58 and the leaf spring 78
The protrusion 78a at the center of the leaf spring 78 abuts against the back surface of the upper substrate 57 to cause the leaf spring 78 to bend and bias the head substrate 58 toward the upper substrate 57. Then, returning to FIG. 1, when the head substrate 58 is in the retracted position where it is in a stopped state, the projection 78a of the leaf spring 78 falls to weaken the urging force for urging the head substrate 58 toward the upper substrate 57 side, Is in the forward position, which is a reproducing state or a recording state, the projection 78a of the leaf spring 78 does not fall and strengthens the biasing force for urging the head substrate 58 toward the upper substrate 57 side and the head substrate rotates left and right at the forward position. A deformed hole 57c is formed in the upper substrate 57 whose urging force does not change even when it is moved. FIG. 3 is a sketch of the assembly.

The operation of the head / pinch roller holding mechanism configured as described above will be described below with reference to FIGS. 4 and 5.

First, FIG. 4 shows the normal reproduction state, and FIG. 5 shows the reverse reproduction state. When the reproduction button 65 is pressed in the C direction from the stopped state in FIG. 1, the head substrate 58 advances in the C direction by the torsion spring 66 as shown in FIG. 2, and the pinch roller 66 presses the capstan 53. At the same time, when the forward / reverse switching button 72 is in the A position,
The pins 76 and 77 of the head substrate 58 are the head switching rod 6
The head substrate 58 is rotated in the counterclockwise direction by the inclined portions 67b and 67c of 7, and the pinch roller 63 and the capstan 53, the pin 77 and the inclined portion 67c bring about the locking and sliding of the head substrate 58. The torsion spring 66 urges the head substrate 58 to rotate and urge the head substrate 58 counterclockwise. Therefore, the forward rotation head 60 comes into contact with the magnetic tape 56 in the microcassette 51, and the inversion head 6
1 is separated from the magnetic tape 56. Further, since the pinch roller 63 rotates counterclockwise around the pin 62 of the head substrate 58, the pinch roller 63 is slightly displaced to the reversing head 61 side and pressure-bonded to the capstan 53.

When the motor is rotated forward by the control means (not shown) by the reproducing rod 64 and the head switching rod 67, the flywheel is rotated via the belt, the capstan 53 is rotated clockwise, and the magnetic tape 56 in the microcassette 51 is rotated. Drive in the direction of arrow E. Further, the forward rotation take-up reel base 54 is rotated clockwise from a gear (not shown) of the capstan 53 via an intermediate gear / retraction mechanism or the like to wind the magnetic tape in the micro-cassette 51 to the forward rotation side, and to forwardly rotate the magnetic tape. The constant speed running operation is performed.

Next, the reverse constant speed traveling operation will be described. From the forward rotation constant speed traveling operation state shown in FIG.
When is moved to the B position, the forward / reverse switching button 72 slides in the F direction against the tension spring 74, and the inclined portion 72a releases the lock pin 75 that locks the head switching rod 67. Then, the head switching rod 67 moves the tension spring 71.
Is slid in the F direction to the position shown in FIG. Also,
The pins 76 and 77 of the head substrate 58 are the head switching rod 6
The head substrate 58 is rotated in the clockwise direction by the inclined portions 67b and 67c of 7, and the pinch roller 63 and the capstan 53, the pin 76 and the inclined portion 67b bring about the locking and sliding of the head substrate 58 by twisting. The head substrate 58 is biased by the spring 66, and the head substrate 58 is pivotally biased clockwise. Therefore, the forward rotation head 61 is separated from the magnetic tape 56 in the micro cassette 51, and
Contacts the magnetic tape 56. Further, since the pinch roller 63 rotates clockwise around the pin 62 of the head substrate 58, the pinch roller 63 is slightly displaced toward the forward rotation head 60 side and pressed against the capstan 53.

When the motor is reversely rotated by the control means (not shown) by the reproducing rod 64 and the head switching rod 67, the flywheel rotates via the belt, the capstan 53 rotates counterclockwise, and the magnetic tape in the micro cassette 51 is rotated. 56 is run in the direction of arrow F. Further, the reversal take-up reel stand 55 rotates counterclockwise from a gear (not shown) of the capstan 53 via an intermediate gear / friction mechanism or the like to wind the magnetic tape in the microcassette 51 to the reversal side so that the reversal is fixed. Perform high-speed running operation.

When the leaf spring 78 for urging the head substrate 58 toward the upper substrate 57 is in the stopped state in FIG. 1, the head substrate 57 is in the retracted position, and the protrusion 78a of the leaf spring 78 is located on the upper substrate 57. It falls into the deformed hole 57c and weakens the urging force for urging the head substrate 58 toward the upper substrate 57 side. Furthermore, the fourth
In the normal rotation reproduction state shown in the figure, the head substrate 57 is at the forward position, the protrusion 78a of the leaf spring 78 does not fall into the deformed hole 57c of the upper substrate 57, and the head substrate 58 is moved to the upper substrate 5.
Even if the head substrate 57 is rotated clockwise about the pin 76 as a fulcrum in the reverse reproduction state as shown in FIG.

According to the present embodiment as described above, the capstan 53,
A pinch roller 63 that can be crimped to the capstan 53, and a forward rotation child head 60 that presses against the magnetic tape 56 in the forward rotation mode.
And a reversing head 61 that comes into pressure contact with the magnetic tape 56 in the reversing mode, and a pinch roller 63 is arranged in the center.
Further, a head substrate 58 is provided on which both the forward rotation head 60 and the reversal head 61 are placed symmetrically with respect to the pinch roller 63 and which is slidable and rotatable on the upper substrate 57. The upper sliding and rotating pin 62 is on the center line passing through the center of the pinch roller and the pinch roller 6
A torsion spring 66, which is arranged in the direction opposite to the capstan 53 side with respect to the rotation center of 3, and further biases the head substrate 58 from the pinch roller 63 toward the capstan 53, and a normal rotation position in the normal rotation mode and a reverse rotation mode. The head switching rod 67 that moves to the reversal position is arranged near the forward rotation head of the head substrate 58, and the pin 76 that can be engaged with the head switching rod 67 is disposed near the reversal head of the head substrate 58. A leaf spring 78 is provided which has a pin 77 engageable with the switching rod 67 and urges the head substrate 58 to the upper substrate 57 side, and one end of the leaf spring 78 is a slide and a rotation under the head substrate 58. A guide part 5 that engages with a moving pin 62 and slides and rotates on the upper substrate 57 at the other end.
Protrusions 78a that engage with 7b and project toward the upper substrate 57 side near the centers of both ends are provided. When the head substrate 58 is in the retracted position, the protrusions 78a of the leaf springs 78 drop to move the head substrate 58 to the upper substrate 57 side. When the head substrate 58 is in the forward position, the urging force for urging the head substrate 58 toward the upper substrate 57 side is increased and the protrusion 78a of the leaf spring 78 does not fall down. The upper substrate 57 whose urging force does not fluctuate even when it is rotated left and right at the forward position
By providing the deformed hole 57c, it is easy to configure the center capstan system using one flywheel, and the head substrate 58 on which the forward and reverse heads 60 and 61 are mounted can be configured by one sheet. In addition, the structure of the device can be greatly simplified, and the size can be further reduced, such that a single urging member that urges the head substrate 58 toward the upper substrate 57 side can be configured. Further, even when the head substrate 58 is rotated left and right in accordance with the forward / reverse switching operation of the head substrate 58, the urging force thereof does not fluctuate, so that the magnetic tape 56 can be reliably driven to run.

As described above, according to the present invention, the capstan, the pinch roller crimpable to the capstan, and the first mode for pressing the magnetic tape in the first mode such as normal recording, normal reproduction, or normal cue review are used. Magnetic head and a second magnetic head that comes into pressure contact with the magnetic tape in the second mode such as reverse recording, reverse playback, or reverse cue review. Further, a pinch roller is arranged in the center and the pinch roller is sandwiched. A head substrate is mounted on which the first magnetic head and the second magnetic head are placed symmetrically and which can be slid and rotated on the substrate. A fulcrum for sliding and rotating on the head substrate is provided. It is arranged on the center line passing through the center of the pinch roller and in the direction opposite to the capstan side from the rotation center of the pinch roller, and the head substrate is biased from the pinch roller in the capstan direction. A biasing member, a head switching member that moves to a first position that stops in the first mode and a second position that stops in the second mode by the forward / reverse switching operation, and a first head substrate. A first engaging portion disposed near the magnetic head and engageable with the head switching member, and a second engaging portion disposed near the second magnetic head on the head substrate and engageable with the head switching member. An urging member for urging the head substrate toward the substrate side, one end of the urging member engaged with a sliding and rotating fulcrum under the head substrate, and the other end on the substrate. Protrusions that engage with the guides that slide and rotate to the side of the board are provided near the center of both ends, and when the head substrate is in the retracted position, the protrusions of the biasing springs drop and the head substrate is moved toward the substrate side. When the head substrate is in the forward position, weaken the urging force to One flywheel by strengthening the urging force that urges the head substrate toward the substrate side without dropping the part and that the urging force does not change even if the head substrate rotates left and right at the forward position It is easy to configure a center capstan system using
And the head substrate on which the second magnetic head is mounted can be configured by one sheet, and the biasing member for biasing the head substrate toward the substrate side can be configured by one, so that the configuration of the device can be greatly simplified,
The size can be further reduced. Further, even if the head substrate is rotated left and right in accordance with the forward / reverse switching operation of the head substrate, the urging force thereof does not change, so that the magnetic tape can be reliably driven to run.

[Brief description of drawings]

FIG. 1 is a plan view of a main part showing a stopped state of a head / pinch roller holding mechanism in an embodiment of the present invention, FIG. 2 is a side view of the main part, FIG. 3 is an assembly sketch thereof, and FIG. FIG. 5 is a plan view of an essential part showing a state, FIG. 5 is a plan view of an essential part showing an inverted state, FIG. 6 is a plan view of an essential part showing a stopped state of a conventional head / pinch roller holding mechanism, and FIG. And FIG. 8 is a plan view of a main part showing an inverted state. 51 ... Microcassette, 52 ... Main substrate, 53 ...
Capstan, 54 ... Forward winding reel stand, 55 ... Reverse winding reel stand, 56 ... Magnetic tape, 57 ... Upper substrate, 58 ... Head substrate, 59 ... Head spacer, 6
0 ... Forward rotation head, 61 ... Inversion head, 64 ...
Reproduction rod, 65 ... Reproduction button, 67 ... Head switching rod, 72 ... Forward / reverse switching button, 78 ... Leaf spring.

Claims (1)

[Claims] 1. A capstan, a pinch roller that can be crimped to the capstan, and a first magnetic head that presses against a magnetic tape in a first mode such as normal recording, normal reproduction, or normal cue review. It is equipped with a second magnetic head that comes into pressure contact with the magnetic tape in a second mode such as reverse recording, reverse playback, or reverse cue review, a pinch roller is arranged in the center, and a pinch roller is sandwiched between the first magnetic head and the first magnetic head. A head substrate on which both the magnetic head and the second magnetic head are mounted and which can be slid and rotated on the substrate,
The fulcrum that slides and rotates on the head substrate is located on the center line passing through the center of the pinch roller and in the direction opposite to the capstan side with respect to the center of rotation of the pinch roller. Furthermore, the head substrate is attached from the pinch roller to the capstan direction. An urging member for urging, a first position for stopping in the first mode by a forward / reverse switching operation, and a second position for stopping in the second mode.
The head switching member that moves to the position of
First engaging portion that is arranged near the magnetic head and is engageable with the head switching member, and second engaging portion that is arranged near the second magnetic head on the head substrate and is engageable with the head switching member. A biasing member that biases the head substrate toward the substrate side,
One end of the urging member is engaged with a fulcrum that slides and rotates under the head substrate, and the other end is engaged with a guide portion that slides and rotates on the substrate. When the head substrate is at the retracted position, the protrusion of the biasing spring is depressed to weaken the biasing force that biases the head substrate toward the substrate side, and when the head substrate is at the forward position. The protrusion of the biasing spring does not fall and strengthens the biasing force for biasing the head substrate toward the substrate side, and the deformed hole of the substrate is provided so that the biasing force does not fluctuate even when the head substrate rotates left and right at the forward position. A head / pinch roller holding mechanism in a magnetic recording / reproducing apparatus.