JPH01311445A - Tape recorder - Google Patents

Abstract

PURPOSE:To make a forward/reverse changeover of a rotary head and a pinch arm by providing a permanent magnet for holding a control cam and a control lever, controlling the cam and driving a forward/reverse substrate. CONSTITUTION:The control lever 20 is turned by rotating the 2nd cam 19 in the direction of F in pressing one end part of the lever 20. Simultaneously, by the other end part, the forward/reverse substrate 14 is slid in the direction of D against the energization of a spring 17, so as to change for a reversing mode. In this case, a movable piece 26 held by the lever 20 is attracted to the permanent magnet 7, so that the lever 20 is held accordingly. Then, when the 1st cam 18 is rotated in the direction of E, a head substrate 2 is advanced, and a forward/reverse shaft 21 of the forward/reverse substrate 14 is held along the reversing side of a U-shaped guide groove 1a, while the substrate 14 is also held in the direction of D on the reversing side. A bent part 2a is brought into contact with a protrusion part 20a of the lever 20, and the lever 20 is released by pressing the protrusion part 20a. Moreover, a change gear 22 is turned to change a head onto the reversing side. Then, a pinch roller arm 9b is turned, and then a pinch roller 12 is pressed against a capstan 15, so that the reversal drive for a tape is hence feasible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an auto-reverse tape recorder in which pinch rollers can be selected depending on the running direction of the tape.

(Prior Art) In recent years, most tape recorders have an auto-reverse function, and at the same time, there has been a trend toward logic-based operating elements that use electromechanical converters to have a touch switch structure.

However, in the conventional technology, a solenoid plunger or the like is used as a driving means for the mechanism that presses the pinch roller against the capstan, but the structure and operation are complicated due to the intervention of drive transmission mechanism parts such as levers. The current consumption was too large (for example, Japanese Patent Laid-Open No. 58-91554).

In addition, the logic-based tape recorder can realize soft-touch operation of the operator, and at the same time requires only one dedicated LSI as a control means to drive the solenoid plunger corresponding to the operation of the operator, compared to conventional Compared to the fully mechanical tape recorder, it had the advantage of being simpler in construction, smaller in size, lighter in weight, and cheaper to manufacture.

Therefore, in recent years, there has been a particular desire to develop an auto-reverse tape recorder with a simple configuration in which each movable part is electronically controlled and the number of transmission mechanism parts is reduced.

Hereinafter, a pinch roller arm drive mechanism in a conventional tape recorder will be described with reference to the drawings.

FIG. 11 is a perspective view showing a conventional head rotation mechanism and a mechanism for pressing a pinch roller against a capstan, FIG. 12 is a plan view showing a control mechanism for a pinch roller arm, and FIG.
The figure is a plan view for explaining the operation of the control mechanism for the pinch roller arm, and FIG. 14 is a diagram for explaining the operation of the control mechanism for the pinch roller arm.

In FIG. 12, 101 is a main chassis.

Various mechanisms described later are attached to the front, upper and lower parts, and left and right side parts. Reference numeral 102 denotes a spatula chassis that can be slid back and forth in the directions of arrows A and B on the main chassis 101, and pinch roller arms 105.
106 are provided. These pinch roller arms
os, 106 is connected to the main chassis 101 at the other end.
It is rotatably supported on shafts 107 and 108 protruding from.

Further, 109 is a head slider interposed between the main chassis 101 and the Herad chassis 102, and a bent engagement piece 110 formed on the negative side thereof and the Herad chassis 10
A coiled spring 111 is engaged between the through hole 102a formed at the end of the head chassis 102, thereby interlocking with the head chassis 102. Here, the head chassis moving mechanism moves the head slider 109 in the direction of the arrow in FIG. 12, and at this time, the head chassis 102 is slid in the same direction via the spring 111.

The pinch roller arms 105 and 106 have one end locked to one side 112 and 113, and the other end to the shaft 10.
torsion springs 116 and 117 that are respectively engaged with bent engagement pieces 114 and 115 formed on both sides of the head slider 109 by winding the coils 7 and 108.

Pinch rollers 103 and 104 respectively and capstan 1
It is rotationally biased in the direction of bringing it into pressure contact with 18 and 119.

Further, on both sides of the head chassis 102, rotation shafts 103 a and 10.4 of pinch rollers 103 and 104 are provided.
Bent pieces 139 and 140 that engage from above in the figure are formed at a.

Further, from one side portion 112, 113 of each pinch roller arm 105, 106, a pinch roller arm control of a driving slider 120 supported at the front end of the main chassis 101 is slidably provided in the directions of arrows C and D in FIG. Piece 12
1. Engagement parts 123 and 124 that can be engaged with 122, respectively.
is formed.

The operation of the pinch roller arm drive mechanism configured as above will be described below.

First, the 13th r! As shown in 1, a recording/playback head 12
5, the head chassis 102 remains in a state corresponding to forward playback of the tape, and the head chassis 102 is temporarily moved back to the same state as stopped.

In this state, although not shown in FIG. 13, the bent pieces 139 and 140 of the head chassis 102 are connected to the rotating shafts 103a and 104a tt of the pinch rollers 103 and 104.
Press downward in the figure, and each pinch roller arm 105.10
6 are rotated clockwise and counterclockwise in the figure against the biasing forces of torsion springs 116 and 117, respectively.

In this state, when power is started from a known tape recorder control LSI (not shown) to a solenoid plunger that drives various movable members of the tape recorder mechanical system (not shown), the drive slider 120 first moves in the direction indicated by the arrow in the figure. slide in the direction shown by the two-dot chain line in the figure. At this time, although detailed explanation is omitted, the head rotation mechanism 126a is switched, and the recording/playback head 125 is switched.
becomes compatible with tape forward playback. Thereafter, the head slider 109 (not shown in FIG. 14) is moved upward in the figure, and in conjunction with this, the head chassis 102 is moved in the same direction.

At this time, in conjunction with the movement of the head slider 109, the pinch roller arms 105 and 106 are rotated counterclockwise and clockwise in the figure via torsion springs 116 and 117, respectively. As shown in FIG. 14, the pinch roller arm 105 is regulated to a position where its engaging portion 123 contacts the pinch roller arm control piece 121 of the drive slider 120 and the pinch roller 103 does not contact the capstan 118. be done.

On the other hand, the pinch roller arm 106 has its engaging portion 124 connected to the pinch roller arm control piece 122 of the drive slider 120.
The pinch roller 104 does not touch the capstan 119.
are pressed together with tape. Then, when the head chassis 102 is moved sufficiently upward in the figure.

The recording and reproducing head 125 enters into a cassette half 126 shown by a two-dot chain line in the figure, comes into contact with the tape, and performs reproduction in the forward direction at 22.

Furthermore, the operation when switching from the tape forward playback state to the reverse playback state can also be explained in reverse to the above. In this case, the engaging portion 124 of the pinch roller arm 106 comes into contact with the pinch roller arm control piece 122 of the drive slider 120, so that the pinch roller 104 is not pressed against the capstan 119.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional configuration, the selective drive of the pinch roller arm corresponding to the forward and reverse rotation of the tape is performed by controlling complicated mechanisms such as cams and levers. The assembly process is complicated.

This has the disadvantage that the number of parts cannot be reduced.

The present invention solves the above-mentioned conventional drawbacks.

The purpose of the present invention is to provide an auto-reverse tape recorder that can significantly reduce the number of parts and switch between forward and reverse directions by simply controlling a cam mechanism.

(Means for Solving Eight Problems) In order to achieve this object, the tape recorder of the present invention includes a mechanical board, a head board slidably supported on the mechanical board, and a head board rotatably supported on the mechanical board. 1st supported
and a second pinch roller arm, which is held on the head substrate, is slidable in a direction substantially perpendicular to the sliding direction of the head substrate, and moves almost integrally with the head substrate to move the first or second pinch roller arm. a normal/reverse rod configured to be selectively engageable with either one of the pinch roller arms; a control lever for controlling the normal/reverse rod; and a control lever for attaching the normal/reverse rod in a first direction with respect to the head base plate. a first cam that controls forward and backward movement of the head substrate; and a second cam that controls the control lever.

holding means for holding the control lever so as to move the opposite rod against the biasing force of the spring to a substantially end point in a second direction opposite to the first direction with respect to the head base plate; It is something.

(Function) With the above configuration, the tape recorder of the present invention can drive the normal and reverse substrates via the control lever by controlling the second cam, thereby making it possible to switch between the rotating head and the pinch arm.

(Example) An example of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic diagram of an auto-reverse tape recorder according to an embodiment of the present invention. Same figure (
A) is a plan view, (B) is a front view, and (C) is a right side view. FIG. 2 is a configuration diagram of the first and second cams. 3 to 10 are explanatory diagrams of the operation of the main parts of the mechanism.

FIG. 3 is a state diagram at the time of normal rotation 5TOP, in which FIG. 3(A) is a plan view and FIG. 3(B) is a front view. Figure 4 shows normal rotation PA
This is a state diagram at the time of USE, the same figure (A) is a plan view, the same figure (
B) is a front view. FIG. 5 is a state diagram during normal rotation P LAY, where (A) is a plan view and (B) is a front view. FIG. 6 is a state diagram at the time of normal rotation switching, with FIG. 6(A) being a plan view and FIG. 6(B) being a front view. Figure 7 is a state diagram when the opposite substrate is held on the opposite side.
) is a plan view, and (B) is a front view. FIG. 8 is a state view of the bending portion of the head substrate just before it comes into contact with the protrusion of the control lever, and FIG. 8(A) is a plan view and FIG. 8(B) is a front view. FIG. 9 is a state diagram at the time of inversion PAUSE, in which FIG. 9(A) is a plan view and FIG. 9(B) is a front view. 1st O
The figures are state diagrams during inversion PLAY, with (A) being a plan view and (B) being a front view.

In FIG. 1, reference numeral 1' denotes a mechanical board provided with a U-shaped guide groove (not shown), and various mechanisms described later are mounted on the front part of the mechanical board. 2 is a head board that can freely slide back and forth in the directions of arrows A and B on the mechanical board 1.

Recording/playback head approximately at the lower center 3. A head rotation mechanism 6 is mounted which rotatably supports a rotary member having an erasing head 4° and a tape guide 5 fixed thereto. Further, a bent portion (not shown) for releasing the attraction by the permanent magnet 7 during reversal, which will be described later, is formed at a predetermined position. Reference numeral 8 designates pinch roller arm shafts protruding from substantially lower both sides of the mechanical board 1, which rotatably support left and right pinch roller arms 9a and 9b, respectively. pinch roller arm 9a,
A shaft 10 and a locking piece 11 are formed at predetermined positions on 9b, and a pinch roller 12 is rotatably supported at one end. In addition, the pinch roller arm 9a
, 9b, one end thereof is locked, and the other end is wound around the shaft 10 and is locked to the locking piece 11.
3b is a bending portion 14 of the opposite substrate 14 whose approximate tip portion will be described later.
a and engages with the pinch roller arm 9a.

The pinch roller 12 supported by the capstan 15
It is supported so as to be biased to rotate in a direction in which it is pressed into contact with. 1
Reference numeral 4 denotes a diagonal substrate supported by the head substrate 2 so as to be able to reciprocate in the directions of arrows C and D, and on substantially lower both sides there are torsion springs 13a of either the left or right pinch roller arms 9a, 9b;
A bent portion 14a is provided which engages with the approximate tip of 13b. Reference numeral 16 denotes a reel stand that supplies and winds up the tape by a driving force from a motor rotatably supported by the mechanical board 1. A spring 17 has one end fixed to the head substrate 2 and the other end fixed to the opposite substrate 14, and urges the opposite substrate 14 in the direction of arrow C.

Reference numeral 18 denotes a first cam rotatably supported on the mechanical board 1, and a follower pin (not shown) planted on the head board 2.
is engaged with the cam groove of the first cam 18, so the head substrate 2 moves forward and backward in the directions of arrows A and B in conjunction with the rotation of the first cam 18 by the driving force from the motor.

Further, a second cam 19 is constructed on the same member as the first cam 18, so that it operates integrally with the first cam 18 and controls a control lever 20, which will be described later. Further, the approximate tip of the regular/reverse shaft 21 planted below the regular/reverse board 14 is engaged with the U-shaped guide groove 1a of the mechanical board 1, and rotates in the normal/reverse direction in conjunction with the sliding movement of the head board 2. The sliding movement of the substrate 14 is regulated. Reference numeral 22 denotes a switching gear rotatably held in the head rotation mechanism section 6, a gear section formed at one end is in mesh with a gear section of the rotating member 23, and a lever section 22a at the other end.
is in engagement with the opposite rod 24.

The rotation member 23 is rotated by the switching gear 22 rotating together with the sliding movement of the opposite rod 24 in the directions of arrows C and D. A control lever 20 is rotatably supported on the mechanical board 1, and one end thereof is brought into contact with the second cam 19 by the biasing force of a one-rotation spring 25. The other end is locked in a notch in the opposite substrate 14, and the opposite substrate 14 is configured to be slidable in the direction of the arrow by the rotation direction of the second cam 19 against the biasing force of the spring 17. has been done.

Further, referring to FIG. 6, the structure of the mechanism for holding the normal and opposite substrates 14 at the time of reversal will be described. Reference numeral 26 is a movable piece made of a magnetic material held by the control lever 20. 7 is a permanent magnet fixed to the mechanical board 1, and when the control lever 20 is rotated by the rotation of the second cam 19 and the opposite board 14 is slid to the reverse side (in the direction of the arrow), the movable piece 26 is arranged so that it is attracted and held.

The operation of the tape recorder configured as described above will be explained below.

First, the operation during normal rotation reproduction will be explained using FIGS. 2, 3, 4, and 5.

From Figure 2, from the 5TOP state (point A) to the PLAY state (
When moving to point B), the first cam 18 and the second cam 19 are moved in the direction of arrow E by an arbitrary driving means (not shown).
By driving in the direction, the head substrate 2 locked by the first cam 18 moves forward in the direction of arrow A (from Fig. 3 to Fig. 4).
Figure) Transition to PLAY state. At the same time, the opposite substrate 14 is biased in the direction of arrow C by the spring 17, while the opposite shaft 2
1 is slid along the U-shaped guide groove 1a while rotating the lever part 22a of the switching gear 22, and the head is set to the forward rotation side (Figure 3 → Figure 4 → Figure 5) .

Further, the substantially tip end of the torsion spring 13a can be engaged with the bent portion 14a provided on the opposite substrate 14, and the head substrate 2
As the pinch roller arm 9a moves forward, the pinch roller arm 9a rotates around the pinch roller arm shaft 8, and the pinch roller 1set is pressed against the capstan 15, making it possible to drive the tape in normal rotation (
Figure 5).

Next, the operation during one-inversion reproduction will be explained using FIGS. 2, 6, 7, 8, 9, and 10.

First, from the stopped state during forward rotation (Fig. 3), the second cam 1
9 rotates in the direction of arrow F, and while pressing one end of the control lever 20, the control lever 20 is rotated.

At the same time, the other end of the control lever 20 slides the opposite substrate 14 in the direction of the arrow against the bias of the spring 17, thereby switching to the reversal mode. At this time, the movable piece 26 held by the control lever 20 is attracted to the permanent magnet 7, and the control lever 20 is held (FIG. 6).Next, when the first cam 18 rotates in the direction of arrow E, During normal rotation, the opening head board 2 moves forward, and the normal/reverse shaft 21 erected on the normal/reverse board 14 forms a U-shaped guide groove 1a.
By following the reverse side, the opposite substrate 14 is also held on the reverse side (in the direction of the arrow) (FIG. 7).

Next, it is necessary to release the movable piece 26 (control lever 20) attracted to the permanent magnet 7 in consideration of switching between the forward and reverse modes. For this purpose, in this embodiment, the control lever 20 is released by the force of the head substrate 2 moving forward. In other words, as the head substrate 2 moves forward, the bending portion 2a bends over the control lever 2.
When the head substrate 2 further advances so as to come into contact with the protrusion 20a of the head 20 (FIG. 8), the control lever 2o is released while the bent portion 2a presses the protrusion 20a (FIG. 9).

Further, the switching gear 22 is rotated in conjunction with the sliding of the normal/reverse substrate 14 in the direction indicated by the arrow, and the head is switched to the reverse side. Further, the pinch roller arm 9b is rotated by the advance of the head substrate 2, and the pinch roller 12 is pressed against the capstan 15, making it possible to drive the tape in reverse (FIG. 10).

Note that the transition operation from normal playback to reverse playback and the transition operation from reverse playback to normal playback are performed by retracting the head board 2 to a temporarily stopped state (Fig. 3), and then switching between normal rotation and reverse rotation. The above operations will be repeated accordingly.

Although the above embodiment has been described with a configuration including claims (1) and (2), the control lever 20 shown in FIG. 1 is eliminated and operates integrally in synchronization with the first cam 18. If the second cam 19 is made of a member different from the first cam 18 and the second cam 19 is configured to be able to directly drive the opposite substrate 14, the configuration according to claim (1) can be obtained. In the embodiment, if the second cam 19 is configured to drive the control lever 20 independently without synchronizing with the first cam 18, the configuration described in claim (2) will be achieved.

As described above, according to this embodiment, the first cam 18 and the second cam 19 are provided, and the first cam 18 connects the head substrate 2.
By driving the opposite substrate 14 with the second cam 19 without providing a special driving means such as a solenoid, it is possible to select the rotating head and pinch roller arm according to the running direction of the tape. .

(Effects of the Invention) As described above, the present invention provides a mechanical substrate, a head substrate slidably supported by the mechanical substrate, and first and second bipolar plates rotatably supported by the mechanical substrate.

a pinch roller arm, which is held on the head substrate, is slidable in a direction substantially perpendicular to the sliding direction of the head substrate, and moves forward almost integrally with the head substrate to connect with either the first or second pinch roller arm; A control lever configured to selectively engage the opposite substrate, a control lever that controls the opposite substrate, a spring that biases the opposite substrate in a first direction relative to the head substrate, and a spring that urges the head substrate forward and backward. a first cam that controls the control lever; a second cam that controls the control lever; By providing a holding means for holding the control lever so as to move it approximately to an end point in the direction, the following effects are achieved.

(1) When transitioning to normal rotation mode, simply rotate the first and second cams clockwise to select the rotating head and pinch roller arm and transition from the stop state (STOP) to the playback state (PLAY). I can do it.

Mechanism operation can be simplified.

(2) When transitioning to the reversal mode, the first and second cams rotate counterclockwise at one end, but after that they only rotate clockwise, changing from the stop state (STOP) to the regeneration state (pr
, AY), the mechanism operation is relatively simple, and there is little time loss during reverse switching. In other words, it is also compatible with quick reverse.

In addition, in the conventional example, a solenoid plunger was used, but in this example, the cost can be reduced by using a permanent magnet as a cam control and holding means, and the practical effect is extremely large. be.

[Brief explanation of the drawing]

1(A), (B), and (C) are a plan view, a front view, and a right side view showing the overall schematic structure of a tape recorder according to an embodiment of the present invention, and FIG. 2 is a first and a second tape recorder. Cam configuration diagram, Fig. 3 (A), (B) to Fig. 1θ (A), (B)
11 is a plan view and a front view of the main parts of a tape recorder according to an embodiment of the present invention, FIG. 11 is a perspective view showing a head rotation mechanism and a mechanism for pressing a pinch roller against a capstan in a conventional tape recorder, and FIG. 13 is a plan view showing the control mechanism of the pinch roller arm, FIG. 13 is a plan view for explaining the operation of the control mechanism of the pinch roller arm,
FIG. 14 is a plan view of the pinch roller arm control mechanism. 1... Mechanical board, la... U-shaped guide groove, 2...
・Head board, 2a, 14a...Bending portion, 3...
- Recording/playback head, 4... Erasing head, 5... Tape guide, 6... Head rotation mechanism section, 7... Permanent magnet, 8... Pinch roller arm shaft, 9a,
9b... 1st. second pinch roller arm, 10.
... shaft, 11 ... locking piece, 12 ... pinch roller, 13a, L3b ... torsion spring, 14 ... right and wrong board, 15 ... capstan, 16 ... reel stand, 17... Spring, 18... First cam, 1
9... Second cam, 20... Control lever, 20
a... Projection, 21... Right and opposite axis. 22...Switching gear, 22a...Lever part, 23
...Rotating member, 24...Reverse rod, 25...
- Rotating spring, 26...movable piece. Patent applicant: Matsushita Electric Industrial Co., Ltd. Figure 2 Figure 3 21 Original Book C 22-t71.浚＼゛￥ 23 RiV, KiP village 25 Hifu fIA bone 26 Town charge Figure 4 Figure 5 □C Figure 6 C Figure 7 D C Figure 8 Q Figure 9 Figure 10 Figure 11 one 7 io+ main',%-n102 he-y de-el-shi103. l04-Hinkerola 11B, ++9
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．． 137- Day 1 Kaid 138...Talk 3 Swing J15 Fig. 14

Claims (4)

[Claims] (1) A mechanical board, a head board slidably supported on the mechanical board, first and second pinch roller arms rotatably supported on the mechanical board, and a head board on the head board. The pinch roller arm is slidably held only in a direction substantially perpendicular to the sliding direction of the head substrate, and is configured to move forward almost integrally with the head substrate and selectively engage with either the first or second pinch roller arm. a first cam that controls the forward and backward movement of the head substrate; a second cam that controls the normal and opposite rod and operates integrally in synchronization with the first cam; a spring that urges the opposite rod in one direction with respect to the head substrate; and a spring that forces the opposite rod in one direction relative to the head substrate, and temporarily moves the opposite rod to an approximately end point in the other direction with respect to the head substrate against the biasing force of the spring. and a holding means for holding the first cam, from the operating point (referred to as point A) of the first cam, which is in the stopped state, that is, the retracted state of the head board, to the playback (including recording) state, that is, the forward movement of the head board. When the first cam operates directly to the operating point of the first cam (referred to as point B), the opposite rod engages with the first pinch roller arm and the first When the first cam moves from point A to point B, it moves to point C, which is the opposite direction from point A to point B, and then moves in the opposite direction again (towards the original point B). direction), and when the roller moves from point A to point B, the opposite rod engages with the second pinch roller arm, resulting in a second regeneration state. tape recorder. (2) a mechanical board; a head board slidably supported by the mechanical board; first and second pinch roller arms rotatably supported by the mechanical board; , capable of sliding in a direction substantially perpendicular to the sliding direction of the head substrate, advancing almost integrally with the head substrate, and selectively engaging with either the first or second pinch roller arm. a control lever for controlling the normal and opposite rod, a spring for biasing the normal and opposite rod in a first direction with respect to the head substrate, and a control lever for controlling forward and backward movement of the head substrate. a first cam;
a second cam that controls the control lever; and a second cam that controls the opposite rod against the biasing force of the opposite rod spring so as to move the opposite rod to an approximately end point in a second direction opposite to the first direction with respect to the head substrate. a holding means for holding the control lever so as to move the control lever, and when the head substrate moves forward with the right-and-back rod in the first position due to the biasing force of the right-and-back rod spring, the right-and-back rod moves toward the first position. The first pinch roller arm is engaged with the first pinch roller arm.
is in the playback (or recording) state, and the control lever is held by the holding means, so that the diagonal rod is held in the second position against the biasing force of the diagonal rod spring, and the head substrate moves forward. At this time, the holding of the control lever by the holding means is released by the advance of the head substrate, but the opposite rod engages with the second pinch roller arm and a second reproduction (or recording) state is established. The tape recorder according to claim (1). (3) In the holding means, when the control lever is moved to the position where it should be held by the second cam, this holding means has no option to select whether or not to hold it (in other words, it is always held) The tape recorder according to claim (2). (4) The tape recorder according to claim (3), wherein a permanent magnet is used as the holding means.