JPS59186159A - Reversible recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify the constitution and to reduce the cost by controlling entire operation by means of plural cam bodies formed incorporatedly on one axis and the 1st and 2nd detecting means related to them. CONSTITUTION:The turning of the 1st cam 4a moves vertically a head board 7 so as to control the position of an erase head 10 and a recording/reproducing head 11. The turning of the 2nd cam 4b opens/shuts the 1st detecting switch 5, this switching signal is inputted to a logical circuit 22, and when the head board 7 comes to a position corresponding to the input of operation command switches 25-31 by the turning of the 1st cam 4a, a driving motor 2 is stopped and the changeover is completed. The turning of the 3rd cam 4c turns the head 11 by 180 deg. so as to press either one of forward and reverse pinch rollers into contact with a capstan shaft. The turning of the 4th cam 4d switches the 2nd detecting switch 6 so as to correspond the switching to the forward and reverse position. Further, the mode change by the operating command is attained by counting the switching of the 1st detecting switch 5, thereby simplifying the constitution.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a reciprocating recording and reproducing device.

Conventional configuration and its problems Conventional so-called power motor mechanisms are inexpensive and convert the rotational force of a motor into linear motion using a cam mechanism, and perform necessary mechanism switching such as raising and lowering the head board or press-contacting the pinch roller. Due to the advantage of low power consumption, they are more widely adopted than solenoid mechanisms. However, in unidirectional tape running, the mechanism basically has only three operating positions: stop, pause, and recording/playback, whereas in a reciprocating type, it also includes pause on the reverse side, recording/playback, and a total of six operating positions. becomes. The power motor type mechanism described above uses electrical detection components such as leaf switches provided on the mechanical board to recognize the operating position of the mechanism at that time, and 3/3 to that position.

The direction of rotation of the power motor is determined by comparing it with the newly applied operation command, and the above-mentioned detection component also detects when the mechanism has moved to the operating position according to the operation command, and at that point the power motor is activated. A microcomputer is generally used for the above electrical processing.

Therefore, the conventional structure of a reciprocating recording/reproducing apparatus is to provide at least three electrical detection parts for each of the five operating positions to perform position detection and control. Alternatively, there was a configuration in which a variable resistor was installed coaxially with the cam, and the position was detected and controlled by utilizing the fact that the resistance value of the variable resistor changed in response to the rotation angle of the cam. However, it is clear that providing three or more detection parts such as IJ connectors and variable resistors requires a large space, and that assembly such as wiring is complicated, which is an obstacle to cost reduction.

Purpose of the Invention The present invention has a complex power motor type reciprocating recording and reproducing mechanism, which is constructed by configuring a plurality of cam bodies on the negative axis, and controlling all operations with only two glues and fittings related to the cam bodies. The purpose is to simplify the

The structure of the invention consists of a first, a second . Third. a fourth cam, a head substrate provided with a magnetic head that moves linearly by rotation of the first cam, and a head substrate that rotates the head 180 degrees by rotation of the third cam and rotates the head to a normal rotation side or a reverse rotation side. A control mechanism that selectively presses one of the pinch rollers against the capstan shaft, and a control mechanism that allows the head board to be placed in an operating position such as recording/playback, pause, or stop according to the rotation of the second cam, or in a non-operating position. a first detection means for electrically detecting the position of the tape; a second detection means for electrically detecting the normal rotation side and the reverse rotation side of tape running according to the rotation of the fourth cam; electrical switch means for inputting operation commands such as the first one; A logic circuit that inputs and performs logical processing on the signal from the second detection means and the signal from the electric switch that inputs the operation command, and a motor control circuit that controls the rotation of the motor based on the output of the logic circuit. It is a reciprocating recording and reproducing device, and the first.
All the complicated external movement control of the reciprocating mechanism can be performed using only two second detection means.

DESCRIPTION OF EMBODIMENTS FIG. 1 is a front view of a mechanism according to the present invention, showing the structure of each member in a stopped state.

1 is a mechanical board, 2 is a drive motor for controlling the mechanism, 3 is a relay gear, the cam body constitutes the first to fourth cams formed in one piece, and 5 (solid line) is a drive motor for controlling the mechanism. The first switch is opened and closed, 6 (dotted line) is the second switch that is opened and closed by the fourth cam, and 7 is the erasing head 10.
12 is a reel drive motor, 13 is a swinging mechanism for selecting a reel stand, 14 is a relay gear for the reel, and 16.16 is a reel stand for supply and winding. 17 and 18 are for reversal.

6 l Capstan for forward rotation, 19 and 20 are for reverse rotation, respectively.
It is a pinch roller for normal rotation, and 21 (dotted line) is a lever rotated by a third cam, and the pinch roller 19,
20 is switched between normal rotation and 9 reverse rotations, and the recording/reproducing head 11 is rotated through 180 degrees of normal rotation and 1 reverse rotation.

FIG. 2 shows the control circuit in block diagram form, and the same parts as in FIG. 1 are designated by the same numbers. 5°6 is the 1st. They are second detection switches, and one end of each is input to the logic circuit 22.

Reference numerals 25 to 31 are operation command switches for stop, pause, playback, recording, fast forward, 1 rewind, 9 reversal, and one end thereof is also input to the logic circuit 22. Reference numeral 23 designates a first motor control circuit, which controls the drive motor 2 to rotate forward, reverse, or stop in accordance with the output of the logic circuit 22. Reference numeral 24 denotes a second motor control circuit, which similarly controls normal rotation, reversal, and stopping of the reel motor 12 in accordance with the output of the logic circuit 22.

An overview of the operation of the mechanism will be explained with reference to FIGS. 1 and 2. When one of the operation command switches 25 to 31 is closed, the logic circuit 22 determines the rotation direction of the control motor 2, and the motor control circuit 23 causes the control motor 2 to start rotating. The rotation of the control motor 2 rotates a cam gear 4 including first to fourth cams via a relay gear 3. The first cam 4a is provided with a groove in the thickness direction,
A bottle 9 is fixed to the left end of the head substrate 7 along this groove.
is moved (see Figure 3). However, a sulin 1-s is provided at the upper end of the head board 7, and the mechanical board 1
Although not shown in FIG. 1, the regulating pin 32 fixed above and the same structure as the above-mentioned nuri note 8 and regulating bottle 32 are provided near the erasing head 10, so that the head substrate 7 is regulated by these. The structure is such that it can only operate in the vertical direction in FIG. Therefore, the first cam 4a
When the head substrate Y rotates, the head substrate Y moves in the vertical direction in FIG. 1 to control the positions of the erasing head 10 and the recording/reproducing head 11.

The second cam 4b integrally formed with the first cam 4a is the first cam 4b.
The outer periphery of the cam 4a is formed with radial irregularities 37 to 44, and the first detection switch 6 is open at the concave portions and closed at the convex portions, and this opening/closing signal is input to the logic circuit 22.
When the head substrate 7 moves to the position corresponding to the input of the operation command switches 25 to 310 by the rotation of the first cam 4a, the control motor 2 is stopped by the first motor control circuit 23, and the switching is thus completed.

The third cam 4C is provided with a groove like the first cam 4a (see FIG. 4), and the bin 33 provided at one end of the lever 21 is provided in the third cam 4C as in the case of the first cam 41L described above. Move it along the groove and rotate the lever 21 around the bin 34. The other end of the lever 21 is also connected to the slide board 35 by the bin 3.
6, and is rotatably connected.

A fourth cam 4d is integrally formed inside and outside of the third cam 4C, and an uneven portion is provided in the radial direction of the fourth cam 4d. cam 4
It opens at the concave portion of d and closes at the convex portion, and the concave portion corresponds to the normal rotation side of the mechanism, and the convex portion corresponds to the reverse rotation side.

Above 3rd. Due to the configuration of the fourth cams 4C, 4(i) and related mechanism members, for example, when the reversing switch of the operation command switches 26 to 31 is operated while the second detection switch 6 is open, the logic circuit 22 and the The motor control circuit 23 of 1 operates to rotate the control motor 2 and switch the mechanism to the reverse side.

The outline of the mechanism operation switching has been explained above, but below, the relationship between the first to fourth cams 4 and the two detection switches 6, 6, and the logic circuit 22, which are the main points of the present invention, will be explained in detail. do.

FIG. 3 is extracted from FIG. 1 to facilitate understanding of the positional relationship between the head base plate 7, the first and second cams 4N, 4b, and the first detection switch 5 in the stopped state. The first cam 4a is formed on the inner circumference of the cam body 4, and the pin 9 of the head board 7 is located at the lowest end of the head board 7 because the first cam is in the open position in FIG. ing.

At this time, the first detection switch 5 is located on the protrusion 37 among the irregularities on the outer circumference of the cam body 4, so it is in the closed state.
1 is there.

On the other hand, as shown in FIG. Fourth cam 4C.

4d is the above-mentioned 1st. Second cam 4? It is integrally formed on the back side of L and 4b, and the third cam 4c has a rotating lever 21.
The bin 33 is configured to move along this, and when the third cam 4c rotates, the rotating lever 21 rotates around the bin 34, and moves the slide board 36 in the lateral direction in FIG. Therefore, the third cam 4 is moved from the position shown in FIG.
When C is rotated clockwise (hereinafter referred to as "reverse direction"), the bottle 33 moves while being regulated by the groove of the third cam 4C, and as a result, the slide base plate 35 moves to the left in FIG. 4 as described above. , change the reverse running side capstan 19 to capstan 1
At the same time, the recording/reproducing heg 11 is rotated 180 degrees.

On the other hand, in FIG. 4, even if the third cam 4c rotates counterclockwise, the bin 33 only moves along the groove of the same radius and no force is applied to the rotating lever 21.

Approximately half of the fourth cam 4d provided on the outer circumference of the third cam 4C is concave and the other half is convex, and the second detection switch 6 is closed in the convex part and opened in the concave part. The opening and closing of this second detection switch 6 is the normal rotation side of reciprocating recording and playback.
It corresponds to the reverse side.

The first detection switch 6 corresponds to each operation mode of the mechanism that is switched by the rotation of the drive motor 2 using the above mechanism.
FIG. 5 shows the relationship between the state of the second detection switch 6, the rotational direction of the drive motor 2 for operation switching, and the running direction. As is clear from FIGS. 3 and 5, the first detection switch 5 is closed in the stable position of the operating mode, and is open in the transient state, and the operating mode is controlled by the operation command switches 26 to 31 in FIG. When changing, press this first detection switch 6
This is possible by counting the opening and closing of the

6 and 7 are diagrams centering on the head substrate 7 and slide substrate 36 corresponding to FIGS. 3 and 4, respectively,
Indicates a temporary stop state on the forward running side.

As is clear from a comparison between FIG. 3 and FIG. 6, the drive motor 2 may be stopped when the second cam 4b passes from the convex portion 37, passes through the concave portion 38, and rides on the convex portion 39. The rotating lever 21 for switching the pinch rollers 19, 20 and rotating the recording/reproducing head 11 by 180 degrees is at the same position in FIGS. 4 and 7, and no switching occurs in these parts.

8 and 9 show the recording and playback state on the forward running side, the first to fourth cams further rotate in the counterclockwise direction, and the first detection switch 5 is connected to the convex portion of the second cam 4b. 41, and at this time, the normal rotation running side capstan 20 is pressed against the capstan 19 and enters the tape running state.

The first to fourth cams are rotated clockwise from the stopped state shown in FIGS. 3 and 4, and when the first detection switch 5 is closed by the convex part 43 via the concave part 44, the drive motor 2 When stopped, it becomes a temporary stop state on the reverse running side. 10 and 11 show the vicinity of the head substrate 7 and slide substrate 21 at this time, and the rotation lever 21 is rotated by the third cam 4c to deflect the slide substrate 35 to the left. and rotate the recording/reproducing head 11 by 180 degrees. Figure 12.

FIG. 13 shows the recording and reproducing state on the reverse running side, where the reverse side capstan 19 is in pressure contact with the capstan 17.

From the above, to switch the operation mode, the current mode and the new operation command are compared to determine the rotation direction of the drive motor 2, and the number of times the first detection switch 5 changes from open to closed is counted to switch the drive motor 2. Just stop it. - For example, to switch from the recording and reproducing state on the forward running side to the recording and reproducing state on the reverse running side, rotate the drive motor 2 clockwise according to Fig. 5, and turn the first detection switch 50 from the fourth opening to the closing. The drive motor 2 may be stopped by switching.

The logic circuit 22 is composed of a microcomputer, and flowcharts 14 to 18 show part of its processing operations.
The operation of this embodiment will be explained based on the drawings.

If there is an operation input in step 46, the process proceeds to step 46, and the process is compared with the previous mode, and only when the mode is different, the process proceeds to step 47. In step 47, it is first determined whether the reversal command switch has been operated, and if it is a reversal command, the process proceeds to step 48, where the previous mode is playback (PLAY) or pause (PAU).
SE) Determine whether

47 If the previous mode was PLAY, set the pulse count to 4 in step 49, then in step 5o
In step 61 or 52, it is determined whether the previous mode was the forward running mode or the reverse running mode using the signal from the second detection switch 6, and in step 61 or 52, the drive motor 2 is set so that the mode is reverse to the previous running mode. Set the rotation direction.

This setting is determined in step 53, and the drive motor 2 is actually rotated in step 54 or 56. When the drive motor 2 starts rotating, a change in the first detection switch 5 from open to closed is detected in step 66, and only when there is a change, the process proceeds to step 57, where the pulse count set in step 49 is counted. Subtract one. Therefore, the second
The cam subtracts by one for each set of protrusions and recesses, and when this is repeated four times, the process advances from step 68 to step 59, where the drive motor 2 is stopped and the switching is completed.

Next, as a second operation example, playback of forward running mode (PLA
Y) to pause the forward running mode (PAUSE).
), step 15 proceeds from step 47 to step 60, proceeds from step 61 to step 62, and sets the pulse count vC1. Since the previous mode is playback (PLAY), the process proceeds from step 63 to step 6Q, and the aforementioned second detection switch 6 is determined.
The first drive motor 2 is rotated clockwise (reversely), and the drive motor 2 is stopped when the first detection switch 5 changes from once open to closed in steps 56 to 69, thereby completing the operation switching.

Effects of the Invention According to the present invention, a plurality of integrally formed cam bodies and a first cam body associated therewith are provided. All operations of a complex reciprocating recording/playback device can be switched using only the second detection means, and all operations can be controlled with just two electric switches even in the case of an electronic switching mechanism using a drive motor. The effect of miniaturizing the mechanism and reducing costs is enormous.

[Brief explanation of drawings]

Fig. 1 is a front view of the main mechanism showing one embodiment of the present invention, Fig. 2 is a block diagram of the operation control circuit, Fig. 3 is a configuration diagram of the peripheral part of the head board when stopped, and Fig. 4 is Figure 5 is a state diagram showing the relationship between the operating mode, detection switch status, and drive motor rotation direction; Figure 6 is the configuration of the peripheral area of the head substrate when stopped on the forward side. Figure 7 is a configuration diagram of the peripheral area of the slide board during forward rotation side temporary stop, Figure 8 is a configuration diagram of the head substrate peripheral area during forward rotation side regeneration, and Figure 9 is a configuration diagram of the slide board peripheral area during forward rotation side regeneration. A configuration diagram of the peripheral area of the board, Figure 1Q is a configuration diagram of the peripheral area of the head substrate during pause on the reverse side, Figure 11 is a configuration diagram of the peripheral area of the slide board during pause on the reverse side, and Figure 12 is a reproduction on the reverse side. FIG. 13 is a block diagram of the peripheral part of the slide substrate in reverse playback, and FIGS. 14 to 18 are flowcharts showing part of the processing operation. 2... Drive motor, 4... Cam body, 4
a to 4d...First to fourth cams, 6.6...
...Detection switch, 7...Head board, 21
...Lever, 22 ...Logic circuit, 23
．． 24...Motor control circuit. Part 1 @ z35 Fig. 2? ? ? 3 5 / / 2\
Logic circuit 1 / "l? / 2M Otsu /?4 Figure 3 Figure 4 635 Figure 5 Figure 6 Figure 7 Figure 9 Figure 3.5 Chest 11 Figure 12 Figure 13 Figure 5 Figure 14 Figure 15 Figure 13 C/Otsu 2 Maemo upper Y'''''A'/Tour, killing = PLAY O Rusu l Ki Ha0 Rusu? +1
6/z3 YES Maemoichito = PLAY O YES Detection sui yte = Masaru O To Wang Geese - Evening setting Fig. 16 Fig. 17 Fig. 18 E H /'53 H. = Forward rotation hゝ54YES/65 ＼ King, 5′ゝゝ / NO Opening time ゝES 57 Puls I destruction N07. 7D2 ””=ob”−

Claims (1)

[Claims] First and second parts formed on the same axis rotated by a drive motor.
．． Third. a fourth cam, a head substrate provided with a magnetic head that moves linearly by rotation of the first cam, and a head substrate that rotates the head 180 degrees by rotation of the third cam and rotates the head to a normal rotation side or a reverse rotation side. A control mechanism that selectively presses one of the pinch rollers against the capstan shaft, and a control mechanism that, depending on the rotation of the second cam, moves the head board into an operating position such as recording/playback, pause, or stop, or a non-operating position. a first detection means for electrically detecting whether the fourth cam is rotating, a second detection means for electrically detecting the normal rotation side and the reverse rotation side of tape running according to the rotation of the fourth cam; electrical switch means for inputting operation commands such as the first one; a signal table from the second detection means; a logic circuit that inputs and logically processes the signal from the electric switch into which the operation command is input; and a motor that controls the rotation of the motor based on the output of the logic circuit 2lS circuit. A reciprocating recording and playback device equipped with a control circuit.