JPS6339983B2 - - Google Patents

Description

Detailed Description of the Invention The present invention uses a post that stands up on a rotating ring unit that rotates around a magnetic tape guide drum (hereinafter referred to as the guide drum) or rotates integrally with the guide drum. In a magnetic recording and reproducing apparatus that records and reproduces signals by pulling out a magnetic tape from a cassette case and winding the magnetic tape by a predetermined amount around the guide drum, the rotary ring unit is rotated by a predetermined amount to record and reproduce signals. After winding the magnetic tape on the guide drum, it is further rotated step by step, and the mechanism is operated (for example, playback, rewind, fast forward, etc.) at each position of the rotating ring unit, and the mode is changed (stop) ← → (rewind) ← → (playback, fast forward, record) to effectively perform tape rewinding operations to eliminate screen disturbances and improve splicing effects, especially in portable specifications. Conventional examples of this type are shown in Figures 5 to 6.
As shown in the figure, the pinch roller 25 pulls out the magnetic tape 2 from a cassette (not shown), rotates the rotary ring unit 3 by a predetermined amount, wraps the magnetic tape 2 around the guide drum 1 by a predetermined amount, and performs recording or recording. During playback, the rotary ring unit 3 on which the pinch roller 25 is placed rotates as shown in FIG. 5, and the pinch roller 25 contacts the capstan 11 to drive the tape, and at other times, for example, rewind or fast forward. Sometimes, as shown in FIG. 6, the rotary ring unit 3 is fixed in a position where the pinch roller 25 is away from the capstan 11, and in this state, a mechanism linked to the operation button moves the idler etc. to perform a predetermined operation. It was tight.

However, with this method, the capstan 11
Generally, the theoretical tape running state is set when the pinch roller 25 is in contact with the capstan 11 and the tape is being driven, but the tape is rewound or fast-forwarded when the pinch roller 25 is released from the capstan 11. Naturally, the magnetic tape runs outside of the theoretical tape running state, which causes deterioration of the magnetic tape due to elongation of the pieces of the magnetic tape.

In addition, conventional examples of jointing are shown in Figures 7 to 8.
As shown in the figure, when the recording state changes to the pause or stop state, the post lever mechanism 53 forcibly rewinds the tape 2 by a predetermined amount (the post forcibly creates slack in the tape). Then, when recording again, in playback mode, synchronize the rotation of the rotating body (guide drum, capstan) during the period of the tape length pulled back (slack tape length), and when it is pulled back, change the mode from playback to recording. The screen seam noise was reduced by switching to . However, this method requires a mechanism to pull back the magnetic tape and a tape slack forming section separately from each operating mechanism, which limits the size of the tape running system or requires a mechanism to operate the post lever. There are several drawbacks, which have been an obstacle to miniaturization of the device.

As described above, the present invention allows operations such as playback, rewinding, and stopping to be performed by rotating the rotary ring unit, and enables remote control operations, as well as efficient tape retraction especially when used as a portable device. This allows for easy image splicing processing with an easy operation mode arrangement. An example of its configuration will be explained below using FIGS. 1 to 4.

In Figure 1, 1 is a magnetic head (not shown)
a magnetic tape guide drum which guides the magnetic tape 2 on its outer periphery; 3 is a rotary ring unit arranged to rotate around the guide drum 1 independently of the rotation of the guide drum 1; 4; and 5 is a post erected on the rotating ring unit 3;
Reference numeral 6 denotes a post fixed to a lever (not shown), which pulls out the magnetic tape 2 from a cassette case (not shown) to the position shown, and winds the magnetic tape 2 around the audio control head 7. 8 is an erase head integrally fixed to the guide drum 1; 9 is a post that regulates the amount of winding of the magnetic tape 2 on the guide drum 1; 11 is a capstan; 12 is a capstan bearing; 13 is a flywheel; 14 is a A tandem reel stand is shown.
Although the explanation is later, the above-mentioned rotating ring unit 3
The part has an upper disc part to which the posts 4 and 5 are fixed, and a drive disc gear is arranged coaxially and movably separately on the upper disc part, and is locked to each other by a spring. has been done. This drive disc gear is coupled to, for example, a motor, and when the motor rotates, the drive disc gear is driven, and because it is spring-biased, the upper disc part also pulls the magnetic tape 2. The upper disk portion rotates to a predetermined position shown in FIG. 1, and its movement is regulated by a stopper (not shown). This drive disk gear can rotate further. The spring is designed to be further stretched by the rotation at this time. A cam 10 is fixed to this driving disk gear for mechanical operation to be described later. 15 is a sliding roller that engages with the cam 10;
It is rotatably attached to an arm 16 that rotates around a shaft 17. 18 is a pin also fixed to the arm 16, which is not shown, but is used to release the brake of the reel stand 14 when the drive disc gear rotates further than the state shown in FIG. 1 and the drive mechanism operates. It is engaged with that brake. Reference numeral 20 denotes a conversion arm which can rotate around a shaft 21. Reference numeral 19 is a connecting arm that connects the arm 16 and the conversion arm 20, and connects each arm 16, 20 with a pin.
are connected to each other and biased by springs. The function of this spring will be described later. 23
is a rotating arm that rotates around a shaft 30, and this rotating arm 23 includes a connecting arm 22 that connects with the conversion arm 20 described above, and a rotating pinch roller 25 that contacts the capstan 11 described above and drives the magnetic tape 2. A communication arm 24 is rotatably connected to an auxiliary arm 27 which is integrally fixed to the arm 28. 2
6 is a pinch roller shaft, and 29 is an axis of the rotating arm 28. Reference numeral 31 denotes a swinging arm that is biased in one direction (the clockwise direction in the drawing) by a spring and rotates around a shaft 32.This swinging arm 31 is a part of the swinging arm that is attached to both ends of the conversion arm 20 described above. Engage fixed pins 35 and 36. 37 is a pin fixed to a part of the swing arm 31;
4 are rotatably connected. Reference numeral 33 denotes an idler, which is rotatably coupled to the arm 34. 38 is a motor pulley, and 39 and 40 are belts that connect the motor pulley 38 to the flywheel 13 and the reel stand 14.

In FIG. 4, 41 and 42 are supply and take-up reels, 14' is a lower reel stand that constitutes the reel stand 14, and 14'' is an upper reel stand. The lower reel stand 14' is fixed to the chassis 51. The upper reel stand is rotatably connected to a bearing 49 held in the housing 50, a part of which is provided with a joint with the above-mentioned idler 33, and a part of which carries the reel 42. The portion 14'' is rotatably connected to a bearing 48 held in the lower reel stand portion 14' by its shaft portion 46, on which the reel stand 41 is placed, and on the other side, a slip mechanism 47 is configured. . This slip mechanism 47 includes a slip ring 44 coupled to the belt 40, a receiving plate 52 integrally coupled to the shaft portion 46, a felt 43 provided between the receiving plate 52 and the slip ring 44, and a slip ring 44.
It consists of a spring 45 that presses the support plate 52 against the support plate 52.
Further, the arrows in the figure indicate the respective rotation directions, and at the operating position of each mechanism, a switch (not shown) is operated.

Next, the operation will be explained. When a cassette is installed in the apparatus, a cassette presence/absence detection switch (not shown) is operated, and the drive motor is rotated. The rotation of this motor rotates a drive disk gear connected to the motor. The rotating ring unit 3 is engaged with a spring bias by the rotation of the drive disc gear.
rotates in the direction of the arrow in FIG. Post 4 at the same time
The tape 2 is also pulled out from the cassette. Then, rotate the rotary ring unit 3 at the position shown in FIG.
The rotation of the upper disk portion is stopped by the stopper, and at the same time, a switch operates to cut off the power to the drive motor.

This state is the stop mode, and when the rewind switch (not shown) is pressed from this state, the drive motor further rotates in response to the switch signal, leaving the upper disc part of the rotary ring unit 3 as it is and the drive disc. Only the gear rotates, and the arm 16, communication arms 19, 2 change from the state shown in FIG. 1 to the state shown in FIG.
2, 24, the conversion arm 20, the rotation arm 23, the rotation arm 28 of the pinch roll 25, etc. rotate in the directions b, c, d, and e shown by the arrows, respectively, and the sliding roller 15 stops (the state shown in FIG. 1). ) angle from the position
Hit the switch at the A° rotated position, the signal will turn off the power to the drive motor, and the drive disc gear will stop at that position. This state is capstan 11
As the pinch roller 25 approaches the
A brake mechanism (not shown) that acts on the reel stand 14 is separated from the reel stand 14 by a pin 18 fixed on the reel stand 6. Furthermore, the pins 35 and 36 change from the state shown in FIG. 1 to the state shown in FIG.
is inserted between the motor pulley 38 and the reel stand 14, transmits the rotation of the motor pulley 38 to the reel stand 14, and the lower reel stand portion 14' rotates in the direction of rewinding the magnetic tape 2 to perform a rewinding operation. Furthermore, at this time, the upper reel stand 14'' and the motor pulley 38 are connected via the belt 40, but since they are set in a weak slip state, they act as an appropriate back tension and prevent the magnetic tape 2 from slacking, etc. It can be prevented.

If the rewinding operation is to stop, when a stop switch (not shown) is pressed, the signal causes the drive motor to rotate in the reverse direction, and the sliding roller 15 is moved from the state shown in FIG. 2 by the spring. Return to the state shown in Figure 1. This return is done by a stopper and does not rotate beyond that shown in Figure 1.

Next, to change from the stop state to the playback state (recording differs only in switching the electrical signal, mechanically speaking, playback and recording are the same movement), press the playback switch (not shown) and the signal will be activated. The drive motor rotates, and the drive disc gear changes from the state shown in Figure 1 to the third position.
Rotate until the switch operates until it reaches the state shown in the figure.
Stop at that position. At this time, the drive mechanism rotates in the direction of the arrow in FIG. 2, moves further from the rewinding position, and enters the state shown in FIG. 3. At this time, the pinch roller 25 comes into pressure contact with the capstan 11 to drive the tape. The driven tape 2 is wound by the upper reel stand 14'' being driven by the belt through the slip mechanism 47. At this time, the rotation of the swinging arm 31 is restricted by the pin 36, and the idler 33
does not get caught between the reel stand 14 and the motor pulley 38. To explain the pressing force of the pinch roller 25 in more detail, as the drive disc gear rotates further from the state shown in FIG. 2, the pinch roller 25 comes into contact with the capstan 11. However, since the drive disc gear rotates further, the movement of the conversion arm 20 coupled to the pinch roller 25 is restricted, and only the arm 16 and the communication arm 19 coupled to the arm 16 rotate to a predetermined position. The spring stretched between the communication arm 19 and the conversion arm 20 will be stretched. The tensile force accompanying the expansion of the spring becomes the pressing force of the pinch roller 25 against the capstan 11.

In order to change from this reproducing state to the stop state, the stop switch is operated to cause the state shown in FIG. 3 to go through the rewinding operation and return to the stop state shown in FIG. 1. Also, in this playback state, the rewind mode is passed through during the operation, but in the playback mode, the mode is detected by the circuit (detected by the operation switch signal), and the drive motor of the capstan 11 or the guide drum is activated. An operation is performed to delay the energization timing of the first drive motor, so that the rewind mode is passed during playback, but rewinding is not substantially performed.

Next, in the case of fast forwarding, the movement of the mechanism is the same as in playback mode. However, it detects that it is in fast forward mode (detects the switch signal) and uses that signal to change the rotation speed of the drive motor for the capstan 11 to N times the rotation speed during normal playback. Fast forward speed is N of playback speed
It will be doubled. Passing through the rewind mode in the process of returning from the fast forward mode to the stop mode is also the same as the playback mode.

Next, the recording mode will be explained. Mechanical movements are the same as in the playback mode. That is, the playback, recording, and fast-forward operations are mechanically the same, but circuit operations are slightly different. When switching from stop mode to recording mode, the circuit starts from playback mode, and when the rotational speed of the capstan system and guide drum system is brought into synchronization with the signal, the circuit automatically switches from playback to record mode. It is now possible to switch to To continue recording further and switch to stop mode, press the stop switch, and the stop signal mechanically moves from recording mode to stop mode.
In the middle of the rewind mode, the rewind mode is performed for several seconds. During this time, the magnetic tape 2 is rewound by a predetermined amount. In order to make the amount of rewinding constant, a means for detecting the amount is required. Although not shown, the magnetic tape 2 is wound around a rotating roller so that it moves with the magnetic tape 2, and the number of rotations of the roller is detected. Therefore, no matter what position the tape winding diameter is, the amount of unwinding is approximately constant. After a few seconds of rewinding, the mechanism automatically enters stop mode and stops.

Since the present invention has the configuration and operation described above, it has the following effects.

(1) Since all operating modes can be controlled centrally using a drive disk gear separate from the upper disk portion constituting the rotating ring unit 3, the mechanism is simplified and is advantageous in reducing size and weight.

(2) After the magnetic tape 2 is mounted on the guide drum 1, the spring bias effectively acts to further rotate the drive disc gear in the same direction, and the rotating ring is spring-engaged with the drive disc gear. The upper disk portion of the unit 3 is pressed against the stopper, and the pressure regulation is not loosened.

(3) From the state where the mode accompanying the rotation of the drive disk gear is stopped (stop mode = state where the tape loading operation is completed), to the rewind mode in the direction of rotation,
Since it is further rotated to enter the playback (fast-forwarding and recording mode in the same mechanism mode) mode, the magnetic tape 2 can be rewound with the normal rewinding operation, which is especially necessary for a means of splicing images in a portable type. is not necessary, which simplifies the structure.

(4) Especially in recording mode, by making the rewind operation time longer when transitioning from the recording state to the stop state compared to the rewind operation during the transition from the stop state to the recording state, the rewind operation can be performed faster than the stop state. In addition to being able to shift to a recording state, the magnetic tape 2 can be rewound in preparation for the next recording in the process of returning from the recording state to the stop state.

(5) Furthermore, because of this mode arrangement,
The rotational direction of the capstan drive motor is the same, and it is only necessary to control the rotational speed, so the circuit does not become complicated.

[Brief explanation of the drawing]

FIG. 1 is an overall view of a magnetic recording/reproducing device according to an embodiment of the present invention, FIG. 2 is a diagram for explaining the rewinding operation of the device, and FIG. 3 is a diagram for explaining the reproducing, fast-forwarding, and recording operations. Figure 4 is a sectional view showing the structure of the reel stand, Figures 5 and 6 are diagrams for explaining the operation of the conventional rotating ring, and Figures 7 and 8 are the conventional jointing mechanism. FIG. 1... Guide drum, 2... Magnetic tape, 3...
Rotating ring unit, 4, 5, 6...post, 7
... Audio control head, 8 ... Erase head, 10 ... Cam, 11 ... Capstan, 13 ... Flywheel, 14 ... Reel stand, 15 ... Sliding roller, 16 ... Arm, 1
9, 22, 24... Communication arm, 20... Conversion arm, 23... Rotating arm, 25... Pinch roller, 27... Auxiliary arm, 28... Rotating arm, 31...
Swing arm, 33... idler, 34... arm, 35, 36... pin, 38... motor pulley.

Claims (1)

[Claims] 1. In a magnetic recording and reproducing apparatus, a magnetic tape is pulled out from a cassette and mounted on a magnetic tape guide drum containing a rotating magnetic head, and a signal is recorded or reproduced on the magnetic tape. It consists of a guide drum, an upper disk part rotatably arranged around the guide drum and having a plurality of posts fixed thereto, and a driving disk gear for a mode in which the upper disk part and a spring are biased. The apparatus includes a rotary ring unit, a stopper on the upper disk portion of the rotary ring unit, and a switch for detecting the positions of each stopper, and the upper disk of the rotary ring unit is stopped at the end position of the magnetic tape mounting operation on the guide drum. 1. A magnetic recording and reproducing apparatus, characterized in that the drive rotary gear is further rotated in the same direction in response to a command for running a magnetic tape to perform a mode switching operation.