JPH087542Y2 - Cam position controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a device for controlling the displacement position of a cam in a cam mechanism.

(Prior Art) A cam mechanism is incorporated in various devices in order to convert a motion such as rotation into a linear motion. For example, in a tape recorder, a head base to which a head and a pinch roller are attached is operated in each operation mode. A cam mechanism is used as a means for moving in correspondence with the above.

FIGS. 3A to 3C show a head base 1 of a tape recorder, on which heads 2 and 3 and a pinch roller 4 are mounted. Substantially U-shaped grooves 5 and 5 are provided on both sides of the head base 1, and guide pins 6 and 6 are inserted into the grooves 5 and 5, respectively. A capstan 7 is provided on the main body side of the tape recorder, and a tape 8 is in contact with the capstan 7.

FIG. 3A shows the position of the head base 1 in each of the stop, fast-forward and rewind operation modes, and the heads 2, 3 and the pinch roller 4 are separated from the tape 8. FIG. 3B shows the position of the head base 1 in the temporary stop operation mode. The head base 1 is slightly moved in the arrow direction via the guide pins 6 and 6, and the heads 2 and 3 and the pinch roller 4 are taped. It is close to the 8 side, so that the playback or recording mode can be instantaneously changed. FIG. 3C shows the position of the head base 1 in the playback (or recording) mode,
The head base 1 is further moved in the arrow direction via the guide pins 6 and 6, and the heads 2 and 3 and the pinch roller 4 are moved to the tape 8.
Is in contact with

The linear movement of the head base 1 in the arrow direction is performed by a cam mechanism via a displacement pin 9 extending from the lower surface of the head base 1. That is, this cam mechanism is the fourth
As shown in FIGS. (A) and (B), a triangular cam 10 with which the displacement pin 9 abuts, a cam plate 11 to which the cam 10 is fixed, a cam 10 and a cam plate 11 are penetrated. And a rotary shaft 12 rotatably supported by a frame body 13. Rotating shaft 12
Is rotationally driven by a drive motor 14 (see FIG. 8) via a reduction mechanism (not shown), so that the cam 10 rotates via the cam plate 11.

By the way, the conventional position control device for controlling the rotational position of the cam 10 includes a rotary plate 15 fixed to the cam plate 11 and a contact piece.
Has 16. As shown in FIG. 8, the rotating plate 15 has a fan-shaped conductive position detection pattern which is held at predetermined intervals.
15A to 15C are provided for each position detection pattern 15A to 1
5C is connected to each input port PA, PB and PC of the microcomputer 18 via a lead wire 17. Each lead wire 17
A constant voltage Vcc is applied to the power source (not shown). One end of the contact piece 16 is fixed to the frame body 13 and grounded via a ground wire 19, and the other end of the contact piece 16 extends so as to be in sliding contact with the plate surface of the rotary plate 15. As shown in FIG. 9, the microcomputer 18 has a CPU, a ROM in which various data and programs are stored, and an R for temporarily storing a calculation result and the like.
It has a normal configuration including an output port connected to the AM and the drive motor 14 (drive circuit) to be controlled.

Now, when the operation button 20 shown in FIG. 9 is pressed and each signal of stop, fast forward or rewind is inputted to the microcomputer 18, the microcomputer 18 sends a forward rotation signal to the drive motor 14, and the cam 10 (cam Rotate plate 11). In this case, since the contact piece 16 is in sliding contact with the non-patterned portion, the input ports PA, PB and PC of the microcomputer 18 are held at "H" by applying the voltage Vcc. Microcomputer
When the input port 18 is held at "H", the forward rotation signal is continuously sent to the drive motor 14, so that the rotary plate 15 rotates in the arrow direction as shown in FIG. When the contact piece 16 slides on the position detection pattern 15A by the rotation of the rotary plate 15, the input port PA is grounded and changes to "L". Accordingly, the microcomputer 18 stops sending the normal rotation signal and stops the drive motor 14. In this state, as shown in FIGS. 4 (A) and 4 (B), the displacement pin 9 is in contact with the cam 10 in the vicinity of the center of the cam plate 11, so that the head base 1 is shown in FIG. 3 (A). It is held in the stop, fast-forward or rewind mode indicated by.

When the operation button for temporary stop is pressed, the drive motor 14 is driven by the normal rotation signal from the microcomputer 18, and at the same time, the cam 10 and the rotary plate 15 are rotated. Then, when the contact piece 16 slides on the position detection pattern 15B, the input port PB changes to "L", so the forward rotation signal from the microcomputer 18 stops and the drive motor 14 stops. In this state, as shown in FIGS. 5 (A) and 5 (B), the displacement pin 9 is pressed by the cam 10 and displaced to the peripheral surface side of the cam plate 11, so that the head base 1 is moved to the position shown in FIG. (B)
It is held in the pause mode indicated by.

Furthermore, when the operation button for playback (or recording) is pressed,
Drive motor by forward rotation signal from microcomputer 18
14 is driven, and the cam 10 and the rotary plate 15 are similarly rotated. As a result, the contact piece 16 moves the position detection pattern 15C.
Input port PC changes to “L” when sliding on
The forward rotation signal from the microcomputer 18 stops and the drive motor 14 stops. In this state, FIG. 6 (A),
As shown in (B), since the displacement pin 9 is further pressed by the cam 10 and displaced outward from the peripheral surface of the cam plate 11, the head base 1 is reproduced (or reproduced) shown in FIG. 3 (C). Recording mode).

When stopping the drive motor 14, of course, the supply of the drive current from the drive circuit is not only stopped, but normally the terminals of the drive motor 14 are short-circuited to electromagnetically brake the rotor, or instantaneously. A reverse voltage is applied to brake the rotor.

By the way, for example, when the play button is pressed and the rotary plate 15 is rotated together with the cam plate 11, the contact piece 16 moves the position detection pattern 15
Even if the microcomputer 18 stops outputting the forward rotation signal at the time of sliding contact with C, the rotor of the drive motor 14 and the cam plate 1
1. Since the rotary plate 15 rotates due to inertia, the rotary plate 15 may stop at the position where the position detection pattern 15C has passed the contact piece 16 position, as shown in FIG. 10 (A). Therefore, conventionally, when the input port PC changes from “L” to “H”, the microcomputer 18 is caused to determine that the cam 10 has displaced due to the passage of the position detection pattern 15C, and the microcomputer 18 A reverse rotation signal is sent to the drive motor 14 to rotate the rotary plate 15 together with the cam 10 in the opposite direction, and the drive motor 14 is stopped when the input port PC changes to "L" again.

(Problems to be solved by the invention) The rotating plate 15 does not always stop when the contact piece 16 is in contact with the center position of each position detection pattern, but is not in contact with the end position of the position detection pattern. It may stop. On the other hand, the vibration applied to the tape recorder, the backlash of the gear that constitutes the speed reduction mechanism, the bending of the contact piece 16,
The cam 10 and the rotary plate 15 may rotate due to the reaction force of the displacement pin 9 or the like. Therefore, for example, FIG. 10 (B)
As shown in, the contact piece 16 is attached to the end c of the position detection pattern 15C.
When the rotating plate 15 slightly rotates in the direction of the arrow due to vibration or the like in contact with the contact piece 16, the contact piece 16 is disengaged from the position detection pattern 15C, resulting in a non-contact state, that is, a position shift. In this state, since the input port PC of the microcomputer 18 only changes from "L" to "H", the cam 18 (rotating plate 15) of the microcomputer 18 is displaced in any direction. Therefore, it is impossible to determine whether or not the drive motor 14 is simply supplied with a reverse rotation signal. Therefore, the rotary plate 15 is the position detection pattern.
The contact piece 16 rotates in the opposite direction until it comes into sliding contact with 15B, and the cam mechanism malfunctions.

(Means for Solving Problems) The present invention has been made to solve the above-mentioned problems, and a corresponding position detection signal at a stop setting position of a cam and a corresponding displacement signal at a non-stop position are respectively provided. Displacement position detectors that alternately output and a stop detection signal are sent to the cam drive motor by the input of position detection signals, and forward or reverse rotation signals are sent to the motor based on the front and rear displacement signals when the cam position shifts. It is an object of the present invention to provide a cam position control device including position control means.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The cam position control device according to the present invention includes a rotary plate 21 as shown in FIG. The rotating plate 21 is provided with fan-shaped rotating patterns 22, 23, 24 at predetermined intervals on its plate surface. These rotating patterns 22 to 24 have conductivity and are connected to the input ports PD, PE and PF of the microcomputer 25 via lead wires 26, respectively. A voltage Vcc is applied to each lead wire 26 via a resistor 27 from a power source (not shown). The rotary plate 21 has stop setting portions 21a, 21b, and 21c formed between the rotation patterns 22 to 24, respectively. The tip end of the contact piece 28 abuts on the plate surface of the rotary plate 21, and the base end thereof is fixed to a frame body of a tape recorder (not shown) and grounded by a ground wire 29.

The microcomputer 25 has the configuration shown in FIG. 9 and controls the drive motor 30. The drive motor 30 rotates a cam plate 11 (see FIG. 4) via a reduction mechanism (not shown), and causes the cam 10 to linearly move the displacement pin 9.

The rotary plate 21 is fixed to the cam plate 11 and is rotated by the drive motor 30 as shown in FIG.

Next, the operation of the position control device according to the present invention will be described based on the flowchart showing the control operation of the microcomputer 25 in FIG.

First, when the head base 1 is in the stop mode {see FIG. 3 (A)}, the contact piece 28 contacts the stop setting portion 21a so that the input ports PD, PE, PF of the microcomputer 25 are all "H". Held in. Therefore, when the fast-forward button or the rewind button of the tape recorder is pressed, the microcomputer 25 judges these instruction modes and holds the drive motor 30 in the stopped state without sending the forward rotation signal, and fast-forwards or rewinds the tape. Perform the return operation.

When another operation button is pressed, the microcomputer 25 sends a normal rotation signal to the drive motor 30 to rotate it in the normal direction,
The cam 10 and the rotary plate 21 are rotated. During this rotation, the contact piece 28 slides on the rotation pattern 22, and the input port PD of the microcomputer 25 is maintained at "L". When the drive motor 30 further rotates in the normal direction, the contact piece 28 is disengaged from the rotation pattern 22 and comes into sliding contact with the stop setting portion 21b, the input port PD changes to "H", whereby the microcomputer 25 moves to the temporary stop position. At the same time as detecting, it is determined whether or not the operation button for pause is pressed. When the temporary stop operation button is pressed, the output of the normal rotation signal is stopped and the drive motor 30 is stopped. In this state, the displacement pin 9 is pressed against the cam 10 as shown in FIG.
Since it is displaced toward the peripheral surface of 11, the head base 1 is held in the temporary stop mode as shown in FIG. 3 (B).

When the operation button for reproduction (or recording) is pressed, the microcomputer 25 further outputs the normal rotation signal to rotate the drive motor 30 in the normal direction, so that the contact piece 28 is stopped.
It comes off from b and comes into sliding contact with the rotation pattern 23. Input port PE
Changes from "H" to "L", the microcomputer 25 outputs the normal signal as it is. When the contact piece 28 comes off the rotation pattern 23 and comes into sliding contact with the stop setting portion 21c, the input port PE changes from "L" to "H", so that the microcomputer 25 detects the reproduction (or recording) position. Since the output of the normal rotation signal is stopped, the drive motor 30 is stopped. In this state, as shown in FIG. 6, the displacement pin 9 is pressed by the cam 10 and is displaced outward of the peripheral surface of the cam plate 11, so that the head base 1 is moved as shown in FIG. 3 (C). The playback (or recording) mode is maintained.

When the reproduction (or recording) mode is switched to the stop mode by pressing the stop operation button, the drive motor 30 is further rotated in the normal direction, and the contact piece 28 slides on the stop setting portion 21a. Therefore,
Since the input port PF changes from "L" to "H", the microcomputer 25 stops the drive motor 30 and holds the head base 1 in the stop mode as shown in FIG. 3 (A). By the way, when switching to the stop mode, the drive motor 30 may be rotated in the reverse direction to detect the change of the input mode PD from “L” to “H”. The point is that the program input to the microcomputer 25 is used. It may be determined appropriately.

By the way, when the play button is pressed, the rotary plate 21 continues to rotate due to the inertia of the rotor of the drive motor 30 and the cam plate 11 or its own inertia, and the contact piece 28 slides into contact with the rotation pattern 24, resulting in a positional deviation. May stop at. In this case, since the input port PF has changed to "L", the microcomputer 25 sends a reverse rotation signal to reverse the drive motor 30. When the contact piece 28 slides on the stop setting portion 21c due to this reverse rotation and the input port PF changes to "H", the microcomputer 25 stops sending the reverse rotation signal and stops the drive motor 30.

Further, when the rotating plate 21 rotates in the opposite direction due to vibration or backlash of the gear while the contact piece 28 is in contact with the end of the stop setting portion 21c during reproduction, the contact piece 28 slidably contacts the rotation pattern 23. Misalignment occurs. In this case, the input port
Since PE has changed to "L", a microcomputer
25 sends a forward rotation signal to rotate the drive motor 30 forward,
When the input port PE changes to "H" by sliding contact with the stop setting portion 21c again, the transmission of the normal rotation signal is stopped and the drive motor 30 is stopped.

Each signal (displacement signal) output by the rotation patterns (non-stop setting position part) 23, 24 immediately before and after the stop setting part 21c
Have the same level “L”, but the signal output in the rotation pattern 23 is a signal that sets the input port PE of the microcomputer 25 to “L”.
The signal output at is a signal that sets the input port PF to "L". Therefore, microcomputer (position control means)
When viewed from 25, the rotation patterns 23 and 24 output 2
Since the two signals are different signals, the microcomputer 25 can determine which of the rotation directions the stop position deviates.

In this way, in which direction the positional deviation has occurred with respect to the stop setting unit 21c is judged by the respective "L" signals from the rotation patterns 23 and 24 located on both sides thereof, and the drive motor 30 is rotated normally or Since the reverse rotation signal is sent, abnormal operation of the mechanism including the cam 10 can be reliably prevented.

FIG. 7 shows another embodiment of the present invention. That is, in this embodiment, the rotation surface of the rotary plate 21 is provided with fan-shaped rotation patterns 32, 33a to 33c and 34a to 34c. These rotating patterns have conductivity, and the rotating patterns 33a-3
3c are connected to each other via a connecting wire 33d, and the other rotation patterns 34a to 34c are connected to each other via a connecting wire 34d. The rotation patterns 32, 33a to 33c and 34a to 34c are connected to the input port P of the microcomputer 25 via the lead wire 26.
Connected to D, PE and PF respectively. The stop setting portions 31a to 31g are formed between these rotation patterns.

In this embodiment, the stop setting unit 31a is in the stop mode, the stop setting unit 31b is in the fast-forward or rewind mode, and the stop setting unit 31c is in the cueing mode of a song in which the tape is headed for high speed running,
The same 31d corresponds to a pause mode, the same 31e corresponds to a reproduction (or recording) mode, the same 31f corresponds to a reverse mode, and the same 31g corresponds to a pause mode at the time of reproduction after reverse. The cam whose position is to be controlled has a predetermined shape for moving the head base 1 in accordance with each of these operation modes.

Therefore, in the state of the stop mode, the contact piece 28 contacts the stop setting portion 31a and the input ports PD, PE, PF are all held at "H", so that the microcomputer 25 detects the stop mode. can do.

When the fast-forward button or the rewind button is pressed, the microcomputer 25 determines the instruction mode and the drive motor 30
A normal rotation signal is transmitted to the normal rotation direction to rotate the rotary plate 21. By this rotation, the contact piece 28 slides on the rotation pattern 33a, and when the input port PD of the microcomputer 25 changes to "L", the normal rotation signal is further transmitted. Then, the contact piece 28 slidably contacts the stop setting portion 31b, and the input port PD is "H".
Returning to, the microcomputer 25 stops the output of the normal rotation signal to stop the drive motor 30, and at the same time stores the count "1" in the RAM. Therefore, the fast forward mode or the rewind mode is maintained.

When the cue button is pressed, the microcomputer 25 sends the forward rotation signal and when the input port PD changes from "L" to "H", that is, the contact piece 28 stops the setting section 31b.
At the time of sliding contact with, the count "1" is stored in the RAM, and the normal rotation signal is further transmitted. And, the contact piece 28 is rotated pattern 34.
When the input port PE changes to "L" by sliding contact with a and then the input port PE returns to "H" by sliding contact with the stop setting unit 31c, the microcomputer 25 stops the output of the normal rotation signal and drives. At the same time when the motor 30 is stopped, the count "2" is stored in the RAM. Therefore, after that, the cue mode is maintained.

When the temporary stop button is pressed, the microcomputer 25 stops the drive motor 30 when the input port PD returns from "L" to "H" due to the sliding contact of the contact piece 28 with respect to the rotation pattern 33b and the detachment thereof. Then, the count "3" is stored in the RAM at the same time as being held in the pause mode. When the play (or record) button is pressed, the microcomputer 25 stops the drive motor 30 when the input port PE returns from "L" to "H" due to sliding contact with the rotating pattern 34b and disengagement. Hold in playback (or recording mode) and RA at the same time
The count “4” is stored in M. Similarly, when the reverse button or the pause button after reverse reproduction is pressed, the drive motor 30 is stopped and the corresponding operation mode is held,
The count “5” or “6” is stored in RAM. And
When the input button PF returns from "L" to "H" due to the contact piece 28 slidingly contacting the rotating pattern 32 when the stop button is pressed and coming off, the microcomputer 25 causes the drive motor to move.
At the same time as stopping 30 and holding it in stop mode, the count "6" stored in RAM is returned to "0".

In this way, the microcomputer 25 sets the stop mode to "0" and counts at each mode position and stores the count in the RAM. Therefore, in the fast forward (or rewind) mode, the temporary stop mode, and the reverse mode, the input port PD When the input port PE changes from “L” to “H” and in the cue mode and playback (recording) mode, the input port PE is “L” as well.
Even when changing from "H" to "H", each mode can be discriminated in relation to the stored count number.

Now, in another embodiment shown in FIG. 7, for example, when the play button is pressed, the contact piece 28 rotates due to the inertia pattern.
If a position shift occurs due to sliding contact with 33c, input port P
Since D changes to "L", the microcomputer 25 sends a reverse rotation signal to reverse the drive motor 30. When the contact piece 28 slides against the stop setting portion 31e due to this reverse rotation and the input port PD changes to "H", the microcomputer 25 stops sending the reverse rotation signal and stops the drive motor 30.

Further, when the contact piece 28 is in contact with the end of the stop setting portion 31e during reproduction and the contact piece 28 slides in contact with the rotation pattern 34b due to vibration or the like to cause a position shift, the input port PE becomes “L”. Therefore, the microcomputer 25 sends a normal rotation signal to rotate the drive motor 30 in the normal direction, and the contact piece 28 again slides against the stop setting portion 31e to change the input port PE to "H". The signal transmission is stopped and the drive motor 30 is stopped. Therefore, in which direction the positional deviation has occurred with respect to the stop setting unit 31e, the rotation patterns 34 on both sides are determined.
The drive motor 30 is judged by each "L" signal from b and 33c.
Can be rotated normally or reversely.

Here, the rotation pattern (non-stop setting position part) 33a, 33b,
Since all the signals (displacement signals) output by 33c are signals that set the input port PD of the microcomputer (position control means) 25 to "L", the microcomputer 25
Seen from, each signal is the same signal. As described above, the signals output from the respective rotation patterns (non-stop setting position portions) do not have to be all different, and the signals output in the rotation patterns immediately before and immediately after at least one stop setting portion are different. If it is a signal, microcomputer
The direction of control (ie, forward rotation or reverse rotation) can be judged at 25.

Although the present invention is applied to the cam mechanism incorporated in the tape recorder in the above-mentioned embodiment, it is needless to say that the present invention can be applied to the cam mechanism of other equipment.

(Advantages of the Invention) According to the present invention, the displacement position detector indicates that the displacement position of the cam is the stop setting position portion, and the displacement position of the cam is the non-stop setting position portion. The displacement control signals are alternately output, and the position control means stops the motor that drives the cam by the position detection signal, and the stop position of the cam is immediately before or after the stop setting position portion corresponding to the stop target position. When the displacement signal is shifted to the non-stop setting position part, it is judged whether the displacement signal supplied is the immediately preceding or immediately following non-stop setting position part,
Since a normal rotation or reverse rotation signal can be sent to the drive motor to correct the deviation of the stop position of the cam, the cam mechanism can always be operated accurately.

[Brief description of drawings]

1 is an overall configuration diagram of a position control device according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the position control device of FIG. 1, and FIGS. 3 (A) to 3 (C) are head bases. 4A, 4B are plan views showing the respective operation mode positions of FIG.
6 (A) and 6 (B) are operation explanatory diagrams of the cam mechanism corresponding to the operation modes of FIGS. 3 (A) to 3 (C), and FIG. 7 is a position according to another embodiment of the present invention. 8 is an overall configuration diagram of a control device, FIG. 8 is an overall configuration diagram of a conventional position control device, and FIG. 9 is a configuration diagram of a conventional position control device mainly showing a configuration of a microcomputer used as a control unit. FIGS. 7A and 7B are front views showing the positional deviation of the rotary plate. 21 ... Rotating plate, 21a-21c, 31a-31g ... Stop setting part, 22
〜24,32,33a〜33c, 34a〜34c …… Rotation pattern, 25 ……
Microcomputer, 30 ... Drive motor.

Claims (2)

[Scope of utility model registration request] 1. A device for controlling a displacement position of a cam driven by a drive motor, wherein a stop setting position portion and a non-stop setting position portion of the cam are provided alternately and continuously, A displacement position detector that alternately outputs a position detection signal indicating that the displacement position is the stop setting position portion and a displacement signal indicating that the displacement position of the cam is the non-stop setting position portion, and For correcting the stop position of the cam while sending a stop signal to the drive motor upon receipt of a position detection signal generated at one stop setting position portion corresponding to the stop target position of the cam specified by Position control means for sending a forward rotation or reverse rotation signal to the drive motor is provided to the displacement position detector, and the displacement position detector has different displacement signals at the non-stop setting position portion immediately before and after the one stop setting position portion. To The position control means is supplied when the stop position of the cam is displaced to a non-stop setting position part immediately before or after the stop setting position part corresponding to the stop target position. A non-stop set position portion is determined in accordance with a displacement signal, and the forward rotation or reverse rotation signal is sent to the drive motor. 2. The displacement position detector includes a non-stop setting position portion formed by a conductive pattern and a non-conductive stop setting position portion formed between the conductive patterns. A cam position control device according to claim 1, characterized in that the utility model is registered.