JP3082847U - Magnetic tape recording / reproducing device - Google Patents

Abstract

(57) [Summary] The video cassette tape recorder 10 includes a clutch mechanism 30, and the clutch mechanism 30 is switched between a recording / playback mode and a high-speed fast-forward / rewind mode. In the fast forward / rewind mode, the second reduction ratio is set, and a high voltage (second voltage) is applied to the capstan motor 28. Therefore, the tape is wound around the supply reel 12 / the take-up reel 14 at a high speed. When approaching the tape end, a deceleration mode is set, and a third voltage lower than the second voltage is applied to the capstan motor 28. Here, if the winding load increases due to a scratch on the tape or the like, the torque becomes insufficient, and the winding of the tape stops. Therefore, in the deceleration mode, when the drive voltage exceeds a predetermined value, it is determined that the winding has stopped, and the first reduction ratio (> the second reduction ratio) is set to eliminate the insufficient torque. [Effect] It is possible to cope with a lack of torque even with a reduction ratio capable of increasing the speed.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a magnetic tape recording / reproducing apparatus, in particular, for example, by setting a reduction ratio between a pulley receiving a rotational force of a capstan motor and an idler gear to a first reduction ratio in a recording / reproduction mode, The present invention relates to a magnetic tape recording / reproducing apparatus that sets a second reduction ratio smaller than the first reduction ratio in a rewind mode.

Here, the reduction ratio refers to the ratio of the rotation speed on the driven side (driven side) to the rotation speed on the driving side, and is expressed by (drive side rotation speed) / (driven side rotation speed). It is.

[0003]

[Prior art]

 An example of a conventional magnetic tape recording / reproducing apparatus of this type is disclosed in Japanese Patent Application Laid-Open No. Hei 5-298784 [G11B 15/30, G11B 15/26, G11B 15/44] published on Nov. 12, 1993. Is disclosed. This reel drive mechanism sets the reduction ratio from the drive means to the first rotating body (tape reel table) to an appropriate value in each of the recording / playback state and the fast-forward state, or the reverse playback state and the rewind state. It is configured to be able to. For example, in the fast forward / rewind state, the tape was wound at a high speed with a smaller reduction ratio than in the recording / reproducing state.

[0004]

[Problems to be solved by the invention]

 However, in this conventional technique, once the reduction ratio is set, the reduction ratio is fixed until the current operation state ends. Therefore, if the tape is damaged or the tape material is uneven when the deceleration mode is set to reduce the tape winding speed during high-speed fast-forward / rewind, the load when winding the tape is reduced. When the reduction ratio is set to a relatively small value, the torque becomes insufficient, and there is a problem that the tape winding stops halfway.

In order to avoid this, it is conceivable to increase the speed reduction ratio to improve the torque shortage, and then increase the drive voltage of the capstan motor to realize high-speed fast-forward / rewind. However, in this case, it is necessary to increase the withstand voltage of a servo circuit (servo IC) that generates (generates) the drive voltage of the capstan motor, so that a high-performance servo IC must be used, which is expensive. Was.

[0006] Therefore, a main object of the present invention is to provide a magnetic tape recording / reproducing apparatus capable of coping with insufficient torque even at a reduction ratio capable of increasing the speed while suppressing costs.

[0007]

[Means for Solving the Problems]

 In the first invention, the reduction ratio between the pulley receiving the rotational force of the capstan motor and the idler gear is set to the first reduction ratio in the recording / playback mode, and the first reduction ratio is set in the high-speed fast-forward / rewind mode. In a magnetic tape recording / reproducing apparatus for setting a second reduction ratio smaller than the ratio, a drive voltage detecting means for detecting a drive voltage of a capstan motor, a voltage determination means for determining whether the drive voltage is greater than a predetermined value, a high speed Switching means for switching from the second reduction ratio to the first reduction ratio when the voltage determination means determines that the drive voltage is greater than the predetermined value after the deceleration mode is set during fast forward / rewind; A magnetic tape recording / reproducing apparatus characterized by comprising a driving means for turning on a pinch roller in response to switching of the magnetic tape.

In a second aspect, the reduction ratio between the pulley receiving the rotational force of the capstan motor and the idler gear is set to the first reduction ratio in the recording / playback mode, and is set in the high-speed fast-forward / rewind mode. In a magnetic tape recording / reproducing apparatus which sets a second reduction ratio smaller than the first reduction ratio, a frequency detecting means for detecting a rotation frequency of a capstan motor, a frequency for determining whether or not the rotation frequency has become a predetermined value or less. Determining means, switching means for switching from the second reduction ratio to the first reduction ratio when the frequency determination means determines that the rotation frequency has fallen below the predetermined value after the deceleration mode is set during high-speed fast-forward / rewind; And a drive unit for turning on a pinch roller in response to switching of the switching unit.

A third invention is to set a reduction ratio between a pulley that receives a rotational force of a capstan motor and an idler gear to a first reduction ratio in a recording / reproduction mode, and to set a reduction ratio in a high-speed fast-forward / rewind mode. In a magnetic tape recording / reproducing apparatus which sets a second reduction ratio smaller than the first reduction ratio, an abnormality detecting means for detecting a rotation abnormality of a capstan motor, and after a deceleration mode is set during high-speed fast-forward / rewind. A magnetic tape recording / reproducing apparatus, comprising: switching means for switching from the second reduction ratio to the first reduction ratio when rotation abnormality is detected by the abnormality detection unit.

[0010]

[Action]

 This magnetic tape recording / reproducing apparatus is applied to, for example, a video cassette tape recorder (VCR). In such a VCR, when the video cassette tape is mounted on the VCR and the fast-forward / rewind button is operated in a stopped state, high-speed fast-forward / rewind can be executed. The VCR mainly includes a capstan motor for rotating a supply reel and a take-up reel, and the rotational force of the capstan motor is applied to a pulley via a belt such as a timing belt. This pulley transmits the rotational force of the capstan motor to the idler gear via a clutch mechanism. In the recording / playback mode, the reduction ratio between the pulley and the idler gear is set to the first reduction ratio. In the high-speed fast-forward / rewind mode, the deceleration ratio is set to a second reduction ratio smaller than the first reduction ratio. That is, in the high-speed fast-forward / rewind mode, the idler gear is rotated at a higher speed than in the recording / playback mode. Therefore, the tape can be wound at a high speed.

During high-speed fast-forward / rewind, when approaching the tape end, a deceleration mode is set, and a lower driving voltage is applied to the capstan motor than when the tape is wound at high speed. Thus, after the deceleration mode is set, the drive voltage to the capstan motor is detected by the drive voltage detection means. When the drive voltage exceeds a predetermined value, it is determined that a rotation abnormality of the capstan motor has occurred, and the switching means switches from the second reduction ratio to the first reduction ratio. At the same time, the pinch roller is also turned on.

That is, if the tape is damaged or the tape material is uneven, the winding load of the tape increases, and the torque is insufficient at the second reduction ratio where the reduction ratio is small. There is a risk that winding of the tape will stop. To avoid this, the gear ratio is switched to the first reduction ratio and the pinch roller is turned on to eliminate the torque shortage.

For example, if the frequency detecting means detects the rotation frequency of the capstan motor, it is determined that the rotation error of the capstan motor has occurred when the rotation frequency becomes lower than a predetermined value. You can also. Therefore, the second reduction ratio may be switched to the first reduction ratio when the rotation frequency becomes equal to or lower than the predetermined value.

[0014]

[Effect of the invention]

 According to this invention, when the rotation abnormality of the capstan motor is detected in the deceleration mode, the reduction ratio is switched so as to increase. Therefore, without changing the design of the reduction ratio capable of increasing the speed, and without increasing the driving voltage, Insufficient torque can be eliminated.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0016]

【Example】

 Referring to FIG. 1, a video tape recorder (VCR) 10 of this embodiment includes a supply reel 12 and a take-up reel 14. The supply reel 12 and the take-up reel 14 are rotatably provided on a chassis 16. An idler gear 18 is provided between the supply reel 12 and the take-up reel 14, and the idler gear 18 is rotatably provided by the swing arm 20. The swing arm 20 is rotated around a rotation shaft 22 a of the pulley 22. The rotating shaft 22a of the pulley 22 is provided with a gear 24 for transmitting a rotating force to the idler gear 18, and the gear 24 is provided rotatably with respect to the rotating shaft 22a. Further, the pulley 22 is connected to a rotor 28a provided integrally with a rotation shaft of a capstan motor 28 (capstan 46 described later) by a belt 26 such as a timing belt. That is, the pulley 22 can receive the rotational force of the capstan motor 28.

A clutch mechanism 30 is provided between the supply reel 12 and the take-up reel 14, and a gear 32 and a gear 34 for transmitting the rotational force of the idler gear 18 to the take-up reel 14. Is provided. The gear 34 is provided so as to mesh with the gear 14 a provided integrally with the gear 32 and the take-up reel 14.

That is, the idler gear 18 is meshed with the gear 12 a provided integrally with the supply reel 12 when the tape is wound on the supply reel 12, and is used when the tape is wound on the take-up reel 14. Is rotated by the swing arm 20 so as to mesh with the gear 32.

The VCR 10 includes a cylinder (drum) 36, and the cylinder 36 is provided at an upper left portion of the chassis 16. Guide grooves 38 are provided on both sides of the cylinder 36. A guide roller 40 for sliding or unloading a magnetic tape (not shown) (hereinafter simply referred to as “tape”) into the cylinder 36 is provided to slide in the guide groove 38.

The VCR 10 further includes a loading motor 42, a pinch roller 44, and a capstan 46. The loading motor 42 is provided at an upper right portion of the chassis 16, and is located between the loading motor 42 and the take-up reel 14. And a capstan 46 is provided.

The capstan 46 is formed integrally with the rotating shaft of the capstan motor 28 as described above via the chassis 16.

Further, the VCR 10 includes a mode lever 48 and a mode lever 50 that are driven in conjunction with a mode switch (not shown) that functions as a rotation detector, and the mode lever 48 is connected to the mode lever 50. That is, when the mode lever 48 is driven in conjunction with the mode switch, the mode lever 50 is driven accordingly. The mode switch is switched according to the rotation (rotation) of the loading motor 42, and accordingly, the mode lever 48 and the mode lever 50 are also driven. More specifically, the mode lever 48 is rotated about its rotation shaft 48a, and accordingly, the mode lever 50 is driven (shifted) in the left and right directions (A and B directions) in the figure. Although the detailed mechanism is not shown, the rotation (rotation) of the loading motor 42 moves the guide roller 40 and turns the pinch roller 44 on and off.

When the VCR 10 is viewed from the direction P in FIG. 1, the idler gear 18, the swing arm 20, the pulley 22, the clutch mechanism 30, and the like are shown in FIG. For simplicity, the take-up reel 14, the gear 32, the gear 34, and the like are omitted in FIG. The same applies to FIGS. 4 and 5 described later.

As shown in FIG. 2, a gear 52 is formed integrally with the pulley 22, and a gear 56 is provided above the gear 52 via a spring 54. As can be seen from the drawing, the diameter of the gear 52 is formed larger than the diameter of the gear 56. That is, the gear 52 has more teeth than the gear 56. The gear 56 is pressed toward the chassis 16 by the spring 54.

In the clutch mechanism 30, a gear 30b, a gear 30c, and a gear 30d having different sizes are integrally provided on a rotation shaft 30a. In this embodiment, as can be seen from the drawing, the diameter of the gear 30c is the largest, and the diameter decreases in the order of the gear 30d and the gear 30b. The rotation shaft 30a is fixedly provided on the chassis 16 by a fastener 30e. That is, the gears 30b to 30d are provided so as to be able to rotate (rotate) with respect to the rotation shaft 30a.

The clutch mechanism 30 switches the gears to be used by driving the mode lever 48 and the mode lever 50 described above. More specifically, when the mode lever 50 is viewed from the bottom side of the VCR 10, it is shown as shown in FIG. The mode lever 50 has a guide groove 50a formed in a step shape. A shaft pin 58a of a switching lever 58 for switching the clutch mechanism 30 is slidably locked in the guide groove 50a, and is connected to the clutch mechanism 30 by a distal end portion 58b provided on a side opposite to the shaft pin 58a. The provided gear 30c is clamped. As shown in FIGS. 4 (A) and 4 (B) and FIGS. 5 (A) and 5 (B), when viewed from the side (the Q direction perpendicular to the P direction in FIG. 1), the switching lever 58 has a square shape. It is formed in an inverted shape, and a turning shaft 58c is provided at the broken portion. Further, the rotation shaft 58c is supported by a bearing 16a provided integrally with the chassis 16. In other words, the switching lever 58 is provided such that the tip end portion 58b can rotate in the vertical direction (up and down) around the rotation shaft 58c.

For example, when the mode lever 50 is moved in the direction A, the guide groove 50a is also moved in the direction A accordingly. Then, the shaft pin 58a slides along the guide groove 50, and the shaft pin 58a contacts one end of the guide groove 50a. In this way, when the mode lever 50 is moved (slid) in the direction A, a force in the direction C is applied to the shaft pin 58a as shown in FIG. The gears 30b to 30d are moved to the first predetermined position (deceleration position). At this time, when the clutch mechanism 30 and the like are viewed from the P direction, as shown in FIG. 4B, the gear 30c of the clutch mechanism 30 is meshed with the gear 56 provided coaxially with the pulley 22, and as shown in FIG. The gear 30 d is meshed with a gear 24 provided coaxially with the pulley 22. That is, since the number of teeth of the gear 30c is larger than that of the gear 56, the rotation speed of the gear 56 is higher than the rotation speed of the gear 30c. Therefore, the reduction ratio (first reduction ratio) between the driving side gear 56 and the driven side gear 30c is larger than 1.

On the other hand, when the mode lever 50 is moved in the direction B, the guide groove 50a is also moved in the direction B, and the shaft pin 58a is brought into contact with the other end 50c of the guide groove 50a. That is, when the mode lever 50 is slid in the direction B, as shown in FIG. 5A, a force in the direction D is applied to the shaft pin 58a, so that the tip 58a is rotated downward. And the gears 30b to 30c are moved to the second predetermined position (speed increasing position). At this time, when the clutch mechanism 30 and the like are viewed from the P direction, as shown in FIG. 5B, the gear 30b of the clutch mechanism 30 meshes with a gear 52 provided integrally with the pulley 22, and A gear 30 d provided on the mechanism 30 is meshed with a gear 24 provided on the same shaft as the pulley 22. That is, since the number of teeth of the gear 30b is smaller than that of the gear 52, the rotation speed of the gear 52 is lower than the rotation speed of the gear 30b. Therefore, the reduction ratio (second reduction ratio) between the driving gear 52 and the driven gear 30b is smaller than 1.

That is, by rotating the switching lever 58 by the mode lever 50, the gears 30b to 30d are moved to the deceleration position or the speed increasing position. For this reason, the reduction ratio between the pulley 22 receiving the rotational force of the capstan motor 28 and the idler 18 is switched between the first reduction ratio and the second reduction ratio (first reduction ratio> second reduction ratio). , The rotation speed of the gear 24 is varied. Accordingly, the rotation speed of the idler gear 18 is also changed. Specifically, in the case shown in FIG. 4B, since the reduction ratio is increased, the idler gear 18 is rotated at a low speed. On the other hand, in the case shown in FIG. 5B, the reduction gear ratio is reduced, so that the idler gear 18 is rotated at a high speed.

However, the magnitude of the reduction ratio is described in the case where the rotational speed of the capstan motor 28 is assumed to be constant.

When the shaft pin 58a is located substantially at the center of the guide groove 50a as shown in FIG. 3, the clutch mechanism 30 is in the state shown in FIG. Are not meshed with any of the gears 30b and 30c of the clutch mechanism 30. In this embodiment, the speed (gear) is switched by providing such a neutral state.

FIG. 6 shows the electrical configuration of the VCR 10 according to this embodiment. VCR 10 includes a system control microcomputer (hereinafter simply referred to as “syscon”) 60. The operation panel 62 is connected to the system controller 60. Although not shown, the operation panel 62 is provided on the surface of the VCR 10 together with a liquid crystal panel and the like, and includes a play button 62a, a fast forward button 62b, a rewind button 62c, a stop button 62d, a pause button 62e, a recording button 62f, and a take-out button. Operation buttons such as a button 62g are provided.

A servo circuit (servo IC) 64 and a drive circuit (driver IC) 66 are connected to the system controller 60. The servo circuit 64 is a control circuit for rotationally driving the capstan motor 28, and rotationally drives the capstan motor 28 according to an instruction from the system controller 60. The rotation of the capstan motor 28 is detected by the FG 68, and the output (FG pulse) of the FG 68 is input to the system controller 60 and the servo circuit 64. The system controller 60 can detect the number of rotations (rotation frequency) of the capstan motor 28 by detecting the FG pulse. The servo circuit 64 detects the FG pulse, detects whether the capstan motor 28 is rotating at a predetermined rotation speed, and changes the driving voltage so that the capstan motor 28 rotates at a predetermined rotation speed (predetermined value). Control.

When the capstan motor 28 is rotated, the supply reel 12 and the take-up reel 14 are also rotated. The rotation of the supply reel 12 is detected by a reel sensor 70, and the detection pulse is given to the system controller 60. The rotation of the take-up reel 14 is detected by a reel sensor 72, and a detection pulse is given to the system controller 60.

For example, on the back surfaces of the supply reel 12 and the take-up reel 14, reflective films (not shown) are attached at predetermined intervals in the circumferential direction, and the reflective films can be irradiated with light. A reel sensor 70 and a reel sensor 72 as sensors are arranged. The rotation of the supply reel 12 and the take-up reel 14 is detected by the reel sensor 70 and the reel sensor 72. Output pulses of the reel sensor 70 and the reel sensor 72, that is, the reflection type optical sensor, are given to the system controller 60.

The driving circuit 66 is connected to the loading motor 42 described above, and the driving circuit 66 generates a driving voltage for the loading motor 42 according to an instruction from the system controller 60. Therefore, the loading motor 42 is driven to rotate. A rotation position detector 74 is provided near the loading motor 42, and the rotation position detector 74 detects the rotation position of the loading motor 42. The position information of the rotational position is given to the system controller 60, and the system controller 60 detects a mechanical operation such as whether loading or unloading is completed.

For example, when a video cassette tape (not shown) is inserted (set) into the VCR 10, the loading motor 42 is driven to rotate according to the instruction of the system controller 60, and the guide roller 40 is moved along the guide groove 38. . Therefore, a magnetic tape (not shown) (hereinafter simply referred to as “tape”) is loaded into the cylinder 36. At this time, the system controller 60 detects the rotation position of the loading motor 42 from the output of the rotation position detector 74 and determines whether the tape has been loaded normally.

Subsequently, when the user operates the play button 62a or the record button 62f, a record / play mode is set, and a desired television program or the like is recorded on a tape or the content recorded on the tape is reproduced. Or be done. In such a recording / reproducing mode, the idler gear 18 meshes with the gear 32 on the take-up reel 14 side, and the tape is wound on the take-up reel 14. At this time, the mode lever 50 is slid in the direction A, and the gears 30b to 30d are moved to the low speed position as shown in FIG. 4A, whereby the idler gear 18 is rotated at a low speed.

In the playback mode, if the fast forward button 62b or the rewind button 62c is pressed during tape playback, fast forward playback or rewind playback is executed. Specifically, in response to a button operation from the operation panel 62, the system controller 60 instructs the servo circuit 64 to rotate the supply reel 12 or the take-up reel 14 at a speed of fast-forward playback or rewind playback.

Then, the servo circuit 64 rotates at the rotation speed for fast-forward playback or rewind playback, that is, a drive voltage (second voltage) higher than the drive voltage (first voltage) in the recording / playback mode. Generate and output Thereafter, the servo circuit 64 detects the FG pulse from the FG 68 and adjusts the drive voltage to the capstan motor 28 so that the capstan motor 28 rotates at a predetermined rotation speed. As described above, when the fast forward playback or the rewind playback is performed and the playback button 62a is operated, the mode returns to the normal playback mode.

When rewind reproduction is instructed, the idler gear 18 meshes with the gear 12 a of the supply reel 12, and the tape is wound on the supply reel 12 side.

When the pause button 62 e is operated during reproduction, the capstan motor 28 is stopped, and the take-up reel 14 is also stopped. That is, the winding of the tape is stopped. In this way, when the pause is executed and the play button 62a is operated, the mode returns to the normal play mode.

Further, when the stop button 62 d is operated, the reproduction of the tape is stopped. That is, the capstan motor 28 is stopped, and thereafter, the loading motor 42 rotates in the reverse direction of the loading, the guide roller 42 is moved along the guide groove 38, and the tape is unloaded.

As described above, when the fast-forward button 62b or the rewind button 62c is pressed in the stopped state, the fast-forward (FF) / rewind (RWD) mode is set, and during normal recording / reproduction, The tape is wound up much faster than during fast forward / rewind playback. Specifically, assuming that the tape winding speed in the recording / playback mode is 1, in the high-speed fast-forward / rewind mode, the tape is wound at 420 to 520 times the speed.

As described above, when the tape is unloaded and the high-speed fast-forward / rewind mode is set, the mode lever 48 and the mode lever 50 are driven by rotating the loading motor 42, and the mode lever 50 is turned on. Slide in direction B. That is, as shown in FIG. 5B, the clutch mechanism 30 is switched.

Then, the idler gear 18 is meshed with a reel (the supply reel 12 or the rewind reel 14) corresponding to the operation of the operation panel 62, and high-speed fast-forward / rewind is executed. Specifically, the system controller 60 instructs the servo circuit 64 to drive the capstan motor 28 at the same drive voltage (second voltage) as that used during fast-forward playback / rewind playback.

That is, a drive voltage (second voltage) higher than that at the time of recording / reproduction is applied to the capstan motor 28, and the capstan motor 28 is rotated. Therefore, the idler gear 18 is rotated at high speed, and high-speed fast-forward or rewind is started. At this time, the reel sensor 70 and the reel sensor 72 detect the respective rotations of the supply reel 12 and the take-up reel 14, and input the detection results to the system controller 60. The system controller 60 detects the remaining amount of the tape from the detection results of the reel sensor 70 and the reel sensor 72, and determines whether to decelerate.

For example, if the number of rotations of the reel on the side on which the tape is wound, ie, the side on which the tape is supplied, is larger than a predetermined value, it is determined that the remaining tape amount is small, and the system controller 60 sets the deceleration mode. That is, the system controller 60 instructs the servo circuit 64 to lower the drive voltage of the capstan motor 28.

However, when the deceleration mode is instructed, the servo circuit 64 applies a third voltage lower than the second voltage to the capstan motor 28. For example, the third voltage has the same value as the first voltage.

When the deceleration mode is set and the tape end is detected by a tape end detector (not shown), the system controller 60 instructs the servo circuit 64 to stop high-speed fast-forward / rewind. Alternatively, stop is instructed in response to the operation of the stop button 62d. Therefore, the brake voltage is applied to the capstan motor 28 by the servo circuit 64, and the capstan motor 28 is stopped.

As described above, high-speed fast-forward / rewind is executed, and the temporal change of the drive voltage applied from the servo circuit 64 to the capstan motor 28 is shown in FIG. 7A. As can be seen from FIG. 7A, when high-speed fast-forward / rewind is started, the maximum driving voltage, that is, the second voltage is applied to the capstan motor 28. Then, when the mode is shifted to the deceleration mode, the voltage is reduced from the second voltage to the third voltage, and the application of the driving voltage is completed with the completion of the winding of the tape.

The reason why the third voltage is applied once and then raised to the second voltage at the start of the high-speed fast-forward / rewind is that if the tape is suddenly rotated at a high speed, the tape may break. Because there is.

However, if the tape is damaged or the tape material is uneven, the winding load of the tape increases after the deceleration mode is set. Therefore, the torque may be insufficient at the reduction ratio (second reduction ratio) in the high-speed fast-forward / rewind mode. If the torque is insufficient, the tape stops halfway during deceleration, and the tape cannot be wound up normally. On the other hand, in the servo circuit 64, the drive voltage is increased in an attempt to rotate the capstan motor 28 at a normal rotation speed. Therefore, as described above, when the torque becomes insufficient, the driving voltage of the capstan motor 28 increases even in the deceleration mode as shown in FIG. 7B. That is, wasteful power is consumed.

In order to avoid this, in this embodiment, after the deceleration mode is set during fast forward / rewind, it is detected whether or not the capstan motor 28 is rotating normally, and an abnormality is detected. If it has occurred, it is switched to the first reduction ratio to eliminate the torque shortage. That is, when the drive voltage exceeds a predetermined voltage value (predetermined value), the reduction ratio is increased.

Specifically, the system controller 60 processes the flowchart shown in FIG. 8, and executes fast forward / rewind. As described above, when the fast-forward button 62b or the rewind button 62c is pressed in the stop state, the system controller 60 starts processing, and sets the second reduction ratio in step S1. That is, the loading motor 42 is driven, the mode lever 50 is moved in the direction B, and the clutch mechanism 30 is moved to the high-speed position as shown in FIGS. 5A and 5B. In a succeeding step S3, the capstan motor 28 is driven by the second voltage. That is, the system controller 60 instructs the servo circuit 64 to apply the second voltage to the capstan motor 28.

Although omitted in the flowchart for the sake of simplicity, the swing between step S1 and step S3 depends on the pressed button (fast forward button 62b or rewind button 62c). The idler gear 18 needs to be switched to the supply reel 12 side or the take-up reel 14 side by the moving arm 20.

As described above, in practice, at the start of high-speed fast-forward / rewind, the third voltage is slightly applied before the second voltage is applied.

In the following step S 5, system controller 60 determines whether or not to decelerate. Specifically, based on the output of the reel sensor 70 and the reel sensor 72, the system controller 60 determines whether or not the number of rotations of the reel supplying the tape has exceeded a predetermined value, and Determine if the amount is small.

If “NO” in the step S5, that is, if the remaining amount of the tape is not small, it is determined that the speed is not reduced, and the process returns to the step S3 to continue the tape winding at a high speed. On the other hand, if "YES" in the step S5, that is, if the remaining tape amount becomes small, it is determined that the speed is reduced, and the deceleration mode is set in a step S7. That is, the system controller 60 instructs the servo circuit 64 to drive the capstan motor 28 at the third voltage lower than the second voltage.

In a succeeding step S 9, it is determined whether or not the servo error voltage is “H”. That is, as shown by using FIG. 7B, it is determined whether or not the capstan motor 28 cannot be driven by the third voltage and a voltage having substantially the same level as the second voltage is output. ing. When the servo circuit 64 drives the capstan motor 28 at substantially the same voltage as the third voltage, the system controller 60 determines that the rotation of the capstan motor 28 is normal. On the other hand, when the servo circuit 64 drives the capstan motor at substantially the same voltage as the second voltage, the system controller 60 determines that the rotation of the capstan motor 28 is abnormal (rotational abnormality). .

Therefore, if “NO” in the step S 9, that is, if the servo error voltage is not “H” as shown in FIG. 7A, it is determined that no rotation abnormality has occurred, and Proceed to step S15. On the other hand, if “YES” in the step S9, that is, if the servo error voltage is “H” as shown in FIG. 7B, it is determined that the rotation error has occurred, and in the step S11, the rotation error is determined. One reduction ratio is set, and the pinch roller 44 is turned on in step S13. That is, by switching the gears from the second reduction ratio to the first reduction ratio, the shortage of torque can be resolved. Further, by turning on the pinch roller 44, the tape can be transported by the capstan 46.

Then, in a step S15, it is determined whether or not there is a stop instruction. Specifically, it is determined whether or not the stop button 62d has been pressed. If “YES” in the step S15, that is, if the stop button 62d is pressed, the high-speed fast-forward / rewind mode is ended as it is. That is, the driving of the capstan motor 28 is stopped. On the other hand, if “NO” in the step S15, that is, if the stop button 62d is not pressed, it is determined in a step S17 whether or not the tape is the end based on the output of the tape end detector.

If “NO” in the step S17, that is, if it is not the tape end, the process returns to the step S9 to determine whether or not an abnormality has occurred. If "YES" in the step S17, that is, if it is the tape end, the high-speed fast-forward / rewind mode is ended as it is.

According to this embodiment, when the mode shifts to the deceleration mode during the execution of the high-speed fast-forward / rewind, the motor abnormality is detected based on the servo error voltage, and in the case of the motor abnormality, the deceleration ratio is switched. Since the lack of torque is eliminated, there is no trouble that the tape stops halfway. Further, since it is not necessary to increase the voltage, power consumption is low, and it is not necessary to use a high-performance servo circuit (servo IC). That is, since the current servo IC can be used, an increase in cost can be prevented.

In this embodiment, the voltage detection period is not particularly described, but is set to a fixed period (for example, several msec) in order to eliminate a detection error. If the period is made longer, the detection error can be eliminated, but if it is made too long, there is a possibility that the capstan motor 28, that is, the winding of the tape, may be stopped during the period. In step S9, the output voltage (drive voltage) from the servo circuit 64 is detected for the fixed period determined in this way.

The VCR 10 according to the other embodiment is the same as the above-described embodiment except that the rotation abnormality of the capstan motor 28 is detected based on the rotation frequency, and thus the repeated description is omitted.

Specifically, the system controller 60 executes a process as shown in FIG. However, the same processes as those shown in FIG. 8 are denoted by the same step numbers, and redundant description will be omitted.

That is, in step S 9 ′, the system controller 60 determines whether or not the rotation frequency has fallen below the predetermined value. In other words, it is determined whether the rotation of the capstan motor 28 is about to stop.

The predetermined value is a value determined by a designer, a programmer, or the like, and is a value obtained empirically through experiments or the like.

If “NO” in the step S 9 ′, the process directly proceeds to a step S 15. On the other hand, if "YES" in the step S9 ', it is determined that an abnormality has occurred in the capstan motor 28, the first reduction ratio is set in a step S11, and the pinch roller 46 is turned on in a step S13. Then, the process proceeds to step S15.

As described above, an abnormality can be detected from the rotation frequency of the capstan motor 28, and the abnormality can be avoided. That is, torque shortage can be eliminated.

In the above-described embodiment, only a VCR is shown as a magnetic tape recording / reproducing apparatus. However, a cassette tape deck, an 8 mm video deck, a video camera, etc., which records (records) / reproduces a magnetic tape. Needless to say, it can also be applied to.

[Brief description of the drawings]

FIG. 1 is an illustrative view showing a configuration of an embodiment of the present invention;

FIG. 2 is an illustrative view showing a configuration of a part of the VCR shown in FIG. 1 embodiment;

FIG. 3 is an illustrative view showing a configuration of a part of the VCR shown in the embodiment in FIG. 1;

FIG. 4 is an illustrative view showing a clutch mechanism of the VCR shown in FIG. 1 embodiment;

FIG. 5 is an illustrative view showing a clutch mechanism of the VCR shown in FIG. 1 embodiment;

FIG. 6 is a block diagram showing an electrical configuration of the VCR shown in FIG. 1 embodiment.

FIG. 7 is a timing chart showing a temporal change of a drive voltage of a capstan motor in a high-speed fast-forward / rewind process.

FIG. 8 is a flowchart showing high-speed fast-forward / rewind processing of the system control microcomputer in the embodiment of FIG. 6;

FIG. 9 is a flowchart showing high-speed fast-forward / rewind processing of a system control microcomputer according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... VCR 12 ... Supply reel 14 ... Take-up reel 18 ... Idler gear 20 ... Swing arm 22 ... Pulley 28 ... Capstan motor 30 ... Clutch mechanism 36 ... Cylinder 44 ... Pinch roller 46 ... Capstan 48, 50 ... Mode lever 58 ... Switch lever 60 ... System control 62 ... Operation panel 64 ... Servo circuit 66 ... Drive circuit 68 ... FG 70,72 ... Reel sensor 74 ... Rotation position detector

Claims (6)

[Utility model registration claims] 1. A reduction ratio between a pulley that receives a rotational force of a capstan motor and an idler gear is set to a first reduction ratio in a recording / reproduction mode, and is set to be smaller than a first reduction ratio in a high-speed fast-forward / rewind mode. A drive voltage detecting means for detecting a drive voltage of the capstan motor; a voltage determining means for determining whether the drive voltage is greater than a predetermined value; Switching means for switching from the second reduction ratio to the first reduction ratio when the voltage determination unit determines that the drive voltage is greater than a predetermined value after the deceleration mode is set during rewinding; A magnetic tape recording / reproducing apparatus, comprising: driving means for turning on a pinch roller in response to switching of a switching means. 2. A speed reduction ratio between a pulley which receives a rotational force of a capstan motor and an idler gear is set to a first speed reduction ratio in a recording / playback mode, and is set to a value lower than the first speed reduction ratio in a high speed fast forward / rewind mode. A magnetic tape recording / reproducing apparatus that sets the second reduction ratio to be smaller, a frequency detector that detects a rotation frequency of the capstan motor, a frequency determination unit that determines whether the rotation frequency has fallen below a predetermined value, a high-speed fast-forward. Switching means for switching from the second reduction ratio to the first reduction ratio when the frequency determination unit determines that the rotation frequency has become a predetermined value or less after the deceleration mode is set during rewinding; A magnetic tape recording / reproducing apparatus, comprising: driving means for turning on a pinch roller in response to switching of the switching means. 3. A speed reduction ratio between a pulley receiving a rotational force of a capstan motor and an idler gear is set to a first speed reduction ratio in a recording / reproduction mode, and is set to be lower than the first speed reduction ratio in a high speed fast forward / rewind mode. A magnetic tape recording / reproducing apparatus which sets the second reduction ratio to be smaller, wherein abnormality detection means for detecting rotation abnormality of the capstan motor, and the abnormality detection means after the deceleration mode is set during high-speed fast-forward / rewind. A magnetic tape recording / reproducing apparatus, comprising: a switching unit configured to switch from the second reduction ratio to the first reduction ratio when the rotation abnormality is detected. 4. The magnetic tape recording / reproducing apparatus according to claim 3, further comprising a drive unit for turning on / off a pinch roller, wherein the drive unit turns on the pinch roller when the rotation abnormality is detected. 5. The apparatus according to claim 1, further comprising: a drive voltage detecting means for detecting a drive voltage of the capstan motor; and a voltage determining means for determining whether the drive voltage is greater than a predetermined value. The rotation abnormality is detected when is larger than the predetermined value.
The magnetic tape recording / reproducing device according to claim 1. 6. The apparatus according to claim 1, further comprising: frequency detecting means for detecting a rotation frequency of said capstan motor; and frequency determining means for determining whether said rotation frequency has fallen below a predetermined value. 5. The magnetic tape recording / reproducing apparatus according to claim 3, wherein the rotation abnormality is detected when a rotation frequency of the motor becomes equal to or less than the predetermined value.