JPH0622074B2 - Tape end detection and walking direction reversing device in tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a tape recorder, in which the drive of the tape is automatically stopped at the end of the winding of the tape, or the running direction of the tape is changed. The present invention relates to a tape end detecting device for automatically switching.

(Prior Art) In a cassette-type tape recorder, a device that detects it by a mechanical mechanism at the end of winding the tape is, for example,
JP-A-55-113148, JP-A-58-26345
No. 57 or No. 57-149542 is known.

(Problems to be Solved by the Invention) Among the above-mentioned conventional examples, the rotating body of the tape end detecting mechanism in the tape recorder of Japanese Patent Laid-Open No. 55-113148 is driven by a capstan shaft and rotates around the rotating center of the rotating body. Since the sliding contact portion of the rotation detecting member from the reel receiver on one side is directly brought into sliding contact with the annular guide and the locking portion, it is impossible to detect the opposite side of both reel stands. Further, this prior art does not show a solution to the problem of reversing the tape running direction.

And, JP-A-58-26345 or JP-A-57-1
In the prior art of No. 49542, it is possible to detect the rotation state of both reels by a detection arm that detects the rotation states of both reels at the same time, but the detection arm does not detect the rotation state of the pair of reels. Since it is a mechanism that rotates or stops synchronously with a member such as a connecting rod, even if the reel on the winding side is stopped, it cannot be detected if the reel on the supply side is rotating, and the tape is loose. It also causes the tape to get caught.

The present invention has been made in view of the above problems, and has a configuration in which the take-up reel stand and the supply-side reel stand are not synchronized with each other and are rotated or stopped in a free state. If the rotation stop state of the stand occurs, it can be detected only by the take-up reel stand, regardless of the rotation or stop of rotation of the supply reel stand. That is, according to the detection mechanism of the present invention, it is possible to automatically detect the reel base on the winding side among the pair of reel bases individually.

[Configuration of Invention] (Means for Solving Problems) In order to achieve the above-mentioned object, the present invention has the following technical features.
The means. That is, a pair of capstan shafts and the capstan shafts
A pair of pinch rollers, which can be attached to and detached from each other,
A pair of reel stands, and one of the pair of reel stands
The other side is the drive side and the other side
Or the tape running direction with the immediate supply of one as the driven side
Is a tape recorder capable of switching between the pair of reel bases 1 and 2 and is frictionally contacted integrally with the reel bases 1 and 2 concentrically.
Engagement pieces 35a, 3 which are rotated by
The circular plates 35 and 33 respectively having 3a are used as a fulcrum about the middle part of the pair of reel stands 1 and 2.
Rotate clockwise or counterclockwise and bend to one side 12
With the rotation detecting arm 12 having a bent portion 12b on the other side
Being integrated with the cam gear 16 driven by the motor
Cam that is mounted and pivotally supported by the swing arm 18
It is a rotary cam mechanism 19 composed of 15. The cam 15 is slidably contacted with an inner peripheral surface formed in a substantially curved shape.
And one bent portion of the rotation detection arm 12
12a and a protruding arm 37 that is detachably supported
It is the detector 13 while the tape is running, the reel base 1 on the one drive side or
Engagement of the circular plate 35 that rotates integrally with the reel base 2
The piece 35a or the engaging piece 33a of the disc 33 detects the rotation.
The swing of the detector 13 is continued via the arm 12.
The reel base 2 or reel on the other driven side.
Engaging piece 3 of the disc 33 that rotates integrally with the base 1
3a or the engagement piece 35a of the disc 35 is prevented from rotating,
When the tape reaches the end, the disk 3 on the drive side
Of the engaging piece 35a of No. 5 or the engaging piece 33a of the disc 33
Is stopped by the tape tension and the detector 13 rocks.
The motion is stopped, and the rotation of the detector 13 is stopped by stopping the detector 13.
A reaction force is applied to the rolling cam mechanism 19 to displace the rolling cam mechanism 19.
Tape by automatic reversing mechanism 21 connected to mechanism 19
It is a mechanism that reverses the traveling direction.

(Operation) To operate the tape recorder, first turn on the power, load the tape, and perform the required operations such as recording and playback. While the tape is recording, playing, or fast-forwarding / rewinding, the pair of reel bases 1 and 2 continue to rotate, so that the rotation detection arm 12 continues to swing and the detector 13 is swung. On the other hand, the cam gear 16 of the cam mechanism 19 receives the rotational force from the drive gear 17 from the motor and always rotates at a constant speed, and the cam 15 also rotates, so that the cam 15 continues to operate together with the detector 13. Then, the tape is sequentially wound on one reel stand 1 or the reel stand 2,
When the winding is completed, the rotation of the reel base 1 or the reel base 2 on the winding side is stopped by the tension of the tape, and the swing detection arm 12 is also stopped. For this reason, the swing of the detector 13 is also stopped, and the cam 15 is locked to the detector 13, so that the cam gear 16 stops rotating. However, since the cam gear 16 continues to transmit the rotational force from the drive gear 17, the cam gear 16 is displaced around the axis of the drive gear 17. The end of the tape can be detected by the displacement of the cam gear 16, and the driving of the tape can be stopped or the running direction of the tape can be automatically reversed.

By the way, in the rotation detecting arm 12, since the bent portions 12a and 12b, which are abutting portions at both ends thereof, are repeatedly contacted and separated from the reel bases 1 and 2, respectively, a pair of reel bases 1 and 2 is provided. Among these, the rotation stop of the take-up side (drive side) reel stand is reliably detected regardless of the rotation or rotation stop of the supply side (driven side).

(Example) The Example of this invention is described based on an accompanying drawing. FIG. 1 is a plan view seen from the front side of the substrate, and FIG. 2 is a rear view thereof.

Reference numerals 23 and 24 are a pair of capstans, 25 and 26 are drive flyholes for the capstans, and 27 is a relay pulley. The motor 5 and the flyholes 25 and 26 are linked by a transmission belt 28 via the relay pulley 27. 1 and 2 are a pair of reel bases rotatably attached to the front side of the base A,
3 and 4 are reel base gears thereof, and the pair of reel bases 1 and 2 are a drive gear 6, a transmission gear 7, 8 and an idler gear 9, 1 which are rotatably attached to a base A from a motor 5.
It is rotationally driven in the order of 0. At the positions near the pair of reel bases 1 and 2, on the front side of the base A and the reel base gears 3,
4. Rotation detecting arm 1 below idlers 9 and 10
Two are provided. The rotation detecting arm 12 is pivotally supported at its intermediate position by a pivot pin 11 which is planted on the base A.

At both ends of the rotation detection arm 12, bent portions 12a and 12b are provided as vertically bent contact portions. Further, on the lower surfaces of the pair of reel bases 1 and 2, discs 35 and 33 are concentrically pressed against the lower surfaces of the reel bases 1 and 2 by springs (not shown), respectively.
It is attached so as to rotate integrally with 2. As shown in FIG. 1, the circular plates 35 and 33 are provided with engaging pieces 35 on the peripheral surface.
a and 33a are provided, and the disks 35 and 33 are integrally rotated by the rotation of the reel bases 1 and 2.

Reference numeral 13 denotes a detector, which is pivotally supported by a pivot pin 14 on the front side of the substrate A and in the vicinity of the reel base 1 (or either the reel base 1 or the reel base 2). The tip of the protruding arm 37 is supported by the bent portion 1 at one end of the rotation detecting arm 12.
It engages and disengages with 2a.

In this way, the engagement pieces 35a, which accompany the rotation of the circular plates 35, 33,
The biasing force of 33a is transmitted to the protruding arm 37 of the detector 13, and the specific configuration is as follows.

When the reel base 1 is rotating counterclockwise on the winding side
During forward travel, the engagement piece 35a also rotates counterclockwise in FIG. 1, and the engagement piece 35a abuts the bent portion 12a and the projecting arm 37, and this abutment causes the detector 1 to move.
3 swings counterclockwise. After that, the engagement piece 35a is pushed back in the clockwise direction by the counterclockwise swing of the detector 13. When the counterclockwise swing of the detector 13 is completed, the disk 35 is rotated counterclockwise together with the reel stand 1, so that the engagement piece 35a is rotated counterclockwise again and the bent portion is formed. 12a and the protruding arm 37. This series of reciprocating operations is repeated while the tape is running. In this case, the engaging piece 33a of the disc 33 that is integrally rotating with the other driven reel base 2 is cut and raised on the base A on the counterclockwise side with respect to the bent portion 12b. The rotation is blocked while it is still in contact with the stopper.

Next, when the reel base 2 is on the winding side and the reel base 2 is rotating in the clockwise direction (during reverse traveling), the engaging piece 33
“A” pushes the bent portion 12 b to bring the bent portion 12 a into contact with the protruding arm 37 via the rotation detection arm 12. The abutment of the protruding arm 37 causes the detector 13 to swing clockwise. After that, the detector 13 swings counterclockwise to operate the projecting arm 37, the rotation detecting arm 12, and the bent portion 12b. At this time, the engagement piece 33a is pushed back in the counterclockwise direction, but when the counterclockwise swing of the detector 13 is completed, the disc 33 is rotated clockwise together with the reel base 2, so that the engagement piece 33a is rotated. Is again rotated clockwise and pushes back the bent portion 12b. This series of reciprocating operations is repeated while the tape is running. In this case, the engagement piece 35a of the one driven reel base 1 continues to be prevented from rotating by the stopper cut and raised on the base A (not shown).

In addition, as shown in FIG. 3, a cam 15 that is integrally rotated with the cam gear 16 is rotatably provided inside the substantially Y-shaped curved portion of the detector 13, and the cam gear 16 is connected to the drive gear 17. Swing arm 1 that rotates about an axis
It is pivotally attached to 8. The cam gear 16, swing arm 18, and cam 15 constitute a rotary cam mechanism 19, and the cam gear 16 is driven by meshing with the drive gear 17. Reference numeral 20 denotes a spring that biases the swing arm 18 toward the detector 13.

As shown in FIG. 1, the cam 15 has a protruding portion 15a having a gradually increasing radius, and this protruding portion 15a is provided in the detector 1.
The inside of the curve of 3 is rotated clockwise. When the projecting portion 15a shifts from a state in which it is inscribed to the one side 13a inside the curve to a state in which the projecting portion 15a is separated from the temporary change 13a, the detector 13 causes the protruding portion 1 to move.
The regulation of 5a is released, and the swinging in the clockwise direction becomes possible. Then, the projecting arm 37 is pushed by the bent portion 12a of the rotation detecting arm 12, and as shown in FIG.
3 rotates clockwise. When the detector 13 is rotated clockwise by a predetermined angle, the protrusion 15a is rotated while being inscribed in the other side 13b, and further rotated to reach the one side 13a.
The detector 13 is rotated counterclockwise this time and is again moved to the first position.
It becomes the state of the figure.

By the way, the rotation of the cam 15 in the clockwise direction causes the cam 15 to move.
The protruding portion 15a of the detector is removed from the side 13a, and the detector 1
Even if the tape 3 reaches the end of the tape even if the tape 3 is rotatable clockwise, the protruding arm 37 is not pushed by the engagement piece 35a when the reel base 1 (and the disk 35) stops rotating. Therefore, the detector 13 does not rotate clockwise. If the detector 13 does not rotate and remains as shown in FIG. 1,
When the cam 15 further rotates as shown in FIG. 4,
The step of the projecting portion 15a comes into contact with the end surface of the other side 13b of the detector 13 so that the cam 15 cannot rotate. Then, in the state shown in FIG. 4, the cam 15 further tries to continue to rotate, so that the protruding portion 15a of the cam 15 presses the end surface of the other side 13b of the detector 13. However, the detector 13
Has a shape such that the force of the protrusion 15a applied to the end face of the other side 13b matches the direction of the pivot pin 14 of the detector 13, the detector 13 is not rotated, and the swing arm 18 supporting the cam 15 is provided. Is rotated counterclockwise as shown in FIG. Then, as shown in FIG. 6, when the cam further rotates and the projecting portion 15a moves away from the end face of the other side 13b, the swing arm 18 is returned to its original position by the spring 20.

The swing arm 18 of the rotary cam mechanism 19 and the automatic reversing mechanism 21 for switching the tape running direction are connected by a connecting rod 22, and when the swing arm 18 rotates counterclockwise as shown in FIG. The automatic reversing mechanism 21 operates and the pinch rollers (not shown) are switched alternately.

The operation when the tape reaches the end of the tape structured as described above will be described.

During forward running, the reel base 1 rotating counterclockwise is stopped from rotating due to the tension applied to it.
During reverse running, the reel base 2 rotating clockwise is also stopped by the tension of the tape.
The rotation of the rotation detection arm 12 is stopped by the stop of the reel base 1 or the reel base 2, and the rotation of the detector 13 is also stopped. Therefore, as shown in FIG. 4, the cam 15 of the rotary cam mechanism 19 has the other side 13b of the detector 13.
The cam gear 16 is locked to the end surface of the cam gear 16 and cannot rotate. However, since the rotational force is continuously transmitted from the drive gear 17 to the cam gear 16, a counterclockwise reaction force is generated in the swing arm 18, and the cam gear 16 is centered on the axis of the drive gear 17 as shown in FIG. It is displaced to the left as shown in. With respect to the displacement of the cam gear 16, the automatic reversing mechanism 21 is actuated via the connecting rod 22, and the tape running direction is automatically reversed during recording and reproduction. Also, during fast-forwarding / rewinding, the tape running drive is automatically stopped.

[Effects of the Invention] In the present invention, since each end of the rotation detection arm repeats engagement and disengagement with the reel base as described above, when the tape reaches the end, the rotation of the driven side (supply side) reel base or The stop of the take-up reel stand can be detected regardless of the stop of rotation. As a result, the take-up (drive side) reel stand that occurs when switching to recording / playback after interrupting the fast-forward operation
(Supply side) Since the tape tension does not work until the slack sent from the reel stand is wound, the supply side reel stand stops,
It is also possible to prevent the tape traveling from being unintentionally reversed by the detection mechanism of the supply-side reel stand operating. Further, since it is possible to detect the stop of the take-up reel stand, the tape is not loosened between the reel stands and the tape is not abnormally wound around the capstan.

In addition, since a cam that is pivotally supported by the swing arm and has a part of its peripheral surface projected is used, and the automatic reversing mechanism is operated by the reaction force that locks this cam to the detector, a separate electromagnet is not required. Moreover, there is an effect that the tape running direction can be reversed by such a simplified detection mechanism.

[Brief description of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is a plan view seen from the front side of a substrate, FIG. 2 is a rear view thereof, and FIGS. 3 to 6 are enlarged plan views showing the operation of a detector and a cam. . 1, 2 ... Pair of reel bases, 5 ... Motor, 12 ... Rotation detecting arm, 13 ... Detector, 15 ... Cam, 1
5a ... protruding portion, 16 ... cam gear, 17 ... driving gear, 18 ... swing arm, 19 ... rotating cam mechanism, 21
...... Automatic reversal mechanism for tape running direction, 22 ...... Connecting rod,
25,26 ...... flywheel

Claims (1)

[Claims] 1. A pair of capstan shafts, a pair of pinch rollers provided so as to come in contact with and separate from each capstan shaft, and a pair of reel bases. In a tape recorder in which the winding side is the driving side and the tape supplying side is the driven side, and the tape running direction can be switched, the tape recorder can rotate concentrically with the pair of reel bases 1 and 2 by friction contact. And the engaging piece 35 projected on a part of the peripheral surface.
a and 33a respectively having a and 33a, and a pair of reel bases 1 and 2 swings about an intermediate portion between them as a fulcrum, and the bent portion 12 corresponds to the engaging pieces 35a and 33a.
a, a rotation detecting arm 12 having a bent portion 12b, a swing arm 18, a cam gear 16 driven by a motor, and a cam that rotates integrally with the cam gear 16 and is pivotally supported by the swing arm 18. A rotation cam mechanism 19 composed of 15; an automatic reversing mechanism 21 connected to the rotation cam mechanism 19; a substantially curved inner peripheral surface with which the cam 15 is in sliding contact; It is composed of a detector 13 having a protruding arm 37 that is detachably attached to the bent portion 12a, and a disk 35 (or a circle) of the reel table 1 (or the reel table 2) on the drive side while the tape is running. As the plate 33) rotates, the reel base 2 on the driven side
(Or the disk 35 of the reel stand 1) is prevented from rotating, so that the disk 35 (or the disk 33) of the drive side reel stand 1 (or the reel stand 2) is engaged. The joint piece 35a (or the engaging piece 33a) abuts against the corresponding bent portion 12a (or the bent portion 12b) and biases it in a certain direction. The swinging is continued by engaging and disengaging the one bent portion 12a with the protruding arm 37, and the detector 13 causes the detector 13 to swing with the rotation detecting arm 12 and the one bent portion 12a and the protruding arm. When the tape reaches the end by continuing engagement and disengagement with 37 and the sliding contact, the disk 35 (or disk 33) of the reel table 1 (or reel table 2) on the drive side is driven. When the rotation is blocked by the tension of the tape, the bias is released, and the rotation detection is performed. The arm 12 stops swinging by releasing the bias, and the detector 13 stops swinging by stopping the engagement / disengagement accompanying the stop of swinging of the rotation detection arm 12, thus stopping the detector 13. The rotary cam mechanism 19
A tape end detection and running direction reversing device in a tape recorder, characterized in that a reaction force is applied to the tape to displace it and the tape reversing mechanism 21 reverses the tape traveling direction.