JPS6139960A - Mode switching device of recording and reproducing mode - Google Patents

Abstract

PURPOSE:To simplify and miniaturize the structure of the titled device by moving vertically a drive gear through switching mechanism so that a reel stand is driven selectively for the driving of a constant speed running drive system and of a high speed drive system. CONSTITUTION:When any operating button of FWD/RVS/FF/REW modes is depressed from the stop mode, a turning arm 38 is moved vertically from a mode changeover slider 1 via a changeover mechanism such as a changeover arm 20, a vertical changeover slider 25 and a turning lever 34. A drive gear 41 provided to a fulcrum 40 of the turning arm 38 is meshed selectively with an upper constant speed gear or the lower high speed gear of a reel stand shaft 2 or 16. Thus, two series of drive systems, the constant speed running system and the high speed running system, are obtained by moving vertically simply the drive gear driven by one drive system to attain simplicity and miniaturization of the structure.

Description

[Detailed Description of the Invention] Industrial Application Field' □ The present invention relates to a monido switching device for a recording/reproducing device such as a VTR. The present invention relates to a motor switching device for a recording/reproducing apparatus configured to selectively switch between constant speed drive system drive and high speed drive system drive.

In conventional VTRs, the tape is actively wound on the reel stand when running at high speed (fast-winding and 7-winding), but when running at constant speed for recording and playback, it is pulled out at a constant speed by the capstan.
In this case, the drawn-out tape must be wound onto a reel stand with a predetermined tension without loosening.

Therefore, the drive system for the reel stand naturally depends on whether it is a high-speed running system or a constant-speed running system.

In contrast, conventionally, the reel stand has two types, one for constant speed and one for high speed.
Two gears are provided, of which the constant speed gear, which is provided so as to be able to slip, is driven by the capstan motor, and the high speed gear, which is fixed to the reel stand, is driven by the loading motor. It was equipped with a two-row drive system. On the other hand, in the second method compared to the first method, only one drive system is provided on the reel stand,
This was controlled by a motor dedicated to driving the reel stand, and the reel stand was rotated by two series of torques.

Problems to be Solved by the Invention However, in the first conventional method, the structure becomes complicated and the cost increases, and it also becomes an obstacle to downsizing the VTR. Furthermore, in the second conventional method, electrical detection and control become complicated, which also increases costs.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a mode switching device for a recording/reproducing device equipped with a reel stand driving device that has a simple structure and is suitable for miniaturization.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides two reel carriage gears, one for constant speed running and one for high speed running, above and below the reel carriage, and also provides a mechanism for meshing with the reel carriage gears. Switching between the drive gear that moves the drive gear and the switch that moves the drive gear up and down. A mechanism is provided, and the switching mechanism moves the drive gear up and down, thereby selectively switching the drive of the reel stand between a constant speed drive system and a high speed drive system.

Function: By configuring as described above, the drive gear driven by one motor can be moved up and down, without having to provide a two-base drive system as in the conventional case. Since a high-speed driving system can be obtained, the structure can be simplified and downsized.

EXAMPLE An example in which the present invention is applied to an 8 mm VTR will be described below with reference to the drawings.

First, a driving device for a mode switching slider (hereinafter simply referred to as M slider) 1, which is the basis of the mode switching device, will be outlined with reference to FIG.

A contact gear 3 provided with a contact switch is rotatably attached to the take-up reel stand shaft 2.
is rotationally driven by a control motor 4 via a reduction gear device 5.

On the other hand, there is a slider drive gear 6 that is rotationally driven via the contact gear 3, and this slider drive gear 6 is connected to the M slider 1.
The rack 7 is engaged with the rack 7. Therefore, the contact gear 3 rotates to a predetermined position depending on the desired mode, and the M
The slider 1 is also guided by a guide and slides in the direction of arrow a or b. The M slider 1 can be changed as desired among six positions (modes): forward, reverse, loading/unloading, fast winding, seven rewinding, stop, normal constant speed running, and reverse constant speed running.

In Figure 2, numeral 9 is a rotating head drum, numeral 10 is a drum motor directly connected to the rotary head drum shaft, numeral 11 is a capstan, and numeral 12 is a capstan motor directly connected to this capstan 11, numeral 12 is a capstan motor directly connected to the capstan 11, and numeral 12 is a capstan motor directly connected to the capstan 11. 13 is a pinch ruler, numeral 14 is a four-ding motor, numeral 1
5 is a loaded magnetic tape, and 16 is a supply reel spindle.

Next, the structure of a reel stand drive device equipped with an up-and-down switching mechanism will be described with reference to FIGS. 3 to 5.゛The M slider 1 slides on the upper part of the mechanical board 18 such as a chassis.
A cam groove 19 of a predetermined shape is formed on the back surface □, and a pin 21 of one arm of a bifurcated switching arm 20 is engaged in this cam groove 19. This switching arm 2
0 is rotatably attached to a fulcrum shaft 22 fixed to a mechanical board 18, and a pin 23 is fixed to the other arm. On the other hand, at the top of the switching arm 20, there is a vertical switching slider 25 that is guided by a pair of pins 24 and can slide in the directions of arrows C and d. engaged. A guide groove 28 is formed in the bent piece 27 at one end. The guide groove 28 consists of horizontal grooves at the upper and lower sides and an inclined groove at the middle.

On the other hand, a hollow bearing 30 is fixed at a predetermined position on the mechanical board 18, and a base plate 3 of this hollow bearing 30 is fixed to a predetermined position on the mechanical board 18.
A rotating lever 34 that can rotate vertically is attached to the fulcrum shaft 33 of the pair of brackets 32 on the top 1 (FIG. 4).The tip of this rotating lever 34 is attached to the hollow bearing 30. The extended end of a retaining shaft 36 attached to the tip of the arm 35 is formed on a pair of arms 35 arranged on both sides of the vertical switching slider 2.
It is engaged with the guide groove 28 of No. 5.

A rotary arm 38 is rotatably attached to the outer periphery of the hollow bearing 30 and can be slid up and down along the outer periphery. engaged. A support shaft 4 is attached to the tip of the rotating arm 38.
0 is fixed, and a drive gear 41 is rotatably attached to this support shaft 40. A plastic magnetic gear 42 made of plastic material and having magnetism is rotatably attached to the boss of the drive gear 41, and this plug gear 42 can slip between it and a hissing plate 43 fixed to the drive gear 41. Magnetically coupled with the required glue and torque. The plastic gear 42 is engaged with two fixed gears 44, and when the pinion 45 that engages with the drive gear 41 rotates, the rotating arm 38 is configured to swing in a desired direction. ing.

Further, the pinion 45 is formed wide and is fixed to a rotating shaft 46 that is supported by the hollow bearing 30.
A drive wheel 48 that is frictionally coupled to a belt pulley 47 is fixed to the lower end of this rotating shaft 46 (FIG. 4).

The belt pulley 47 is rotationally driven by the capstan motor 12 via a timing belt 49.

Next, as shown in FIG. 1, an early spring gear 51 formed integrally with a brake pulley is rotatably attached to the take-up reel stand shaft 2 supported by a bearing on the mechanical board 18.
A take-up reel stand 52 is fixed to the boss of the flat winding carrier 51. On the other hand, the boss of the reel stand 52 has an early spring gear 51.
A constant speed take-up gear 53 is rotatably attached to the upper part of the , and the constant speed take-up gear 53 and early spring gear 51 are connected to the hiss plate 54 of the constant speed take-up gear 53 and the magnet plate of the early spring gear 51. 55, they are magnetically coupled to each other with a required limiter torque that allows them to slip.

Reference numeral 57 in FIG. 3j is a brake release slider that moves reciprocally, and the extended lower end of the support shaft 40 of the rotating arm 38 is inserted into the regulation hole 58 of the brake release slider, and the slider 57 moves in the direction of arrow C. When moving forward, the wide inner surface 59 regulates the rotation angle of the rotating arm 38, and when moving backward in the direction of arrow d, the tapered surface 60 serves to return the rotating arm 38 to the neutral position. doing.

Next, the operation of the reel stand drive device configured as above will be explained. First, in the stop mode shown in FIG. 3, the switching arm 20 has its pin 21 connected to the cam tile 19 of the M slider 1.
Therefore, the vertical switching slider 25 is sliding in the direction of the arrow d. Therefore, as shown in FIG. 4, the engagement shaft 36 is pushed up into the horizontal groove at the top of the guide monument 28, and the pivot lever 34 is pivoted upward, thereby pushing the pivot arm 38 upward. The drive gear 41 is in the upper position.

Therefore, when the FWD (normal constant speed driving) or RVS (IJ berth constant speed driving) operation button is pressed from this stop mode, the control motor rotates in the required direction as shown in FIG. The M slider 1 slides in the direction indicated by the arrow. Then, point A or point B of the cam groove 19 in FIG. 3 reaches the pin 21 and stops.

However, since the pin 21 is in the same position at this time, the switching arm 20 does not rotate and the drive gear 41 remains at the same upper position. In the FWD mode, the pinion 45 rotates in the direction of arrow e, so the rotating arm 38 rotates to the right in FIG. and becomes FWD mode. Note that before the rotating arm 38 rotates, the brake release slider 51 is slid in the direction of arrow C by the M slider 1 to release the main I brake of the reel stand, and the rotating arm 3
The support shaft 4o of No. 8 is located within a wide regulation hole 58 and is rotatable.

In the RVS mode, the rotational direction of the pinion 45 is in the opposite f direction, so the rotating arm 38 rotates to the left, the drive gear 41 meshes with the constant speed gear of the supply reel stand shaft 16, and the RVS mode.

Next, when the PP' (fast winding) operation button is pressed from the stop mode shown in FIG. 3, the M slider 1 slides in the direction of arrow a and stops in the state shown in FIG. 6. In other words, pin 2
1 is pushed downward in FIG. 6 by the cam groove 19, the switching arm 20 rotates clockwise, and the vertical switching slider 25 slides in the direction of arrow C. Then, the engagement shaft 36 is pushed downward by the guide 8281, so the rotating lever 34 rotates downward, and the drive gear 41 of the rotating arm 38 is lowered to a lower position.

In this FF mode, the pinion 45 rotates in the direction of arrow e, so the rotating arm 38 rotates to the right in FIG. When engaged, the FF mode is established. It should be noted that the brake release lever 51 slides in the direction of arrow C, as described above.Also, the RBW (rewind) mode is also the same as the FF mode, but at this time, the rotation direction of the pinion 45 is in the direction of arrow f. 6, the rotating arm 38 rotates to the left in FIG. 6, and the drive gear 41 meshes with the rewinding gear of the supply reel stand shaft 16, thereby entering the REW mode.

In this way, the rotating arm 38 is moved up and down from the M slider 1 through switching mechanisms such as the switching arm 20, the vertical switching slider 25, and the rotating lever 34. 41 to reel stand shaft 2 or 16
It is designed to mesh with the upper constant-speed running gear or the lower high-speed running gear. Note that the rotational speed of the reel stand is switched between constant speed and high speed by speed control of the capstan motor 12.

As described in detail, according to the present invention, the switching mechanism moves the drive gear up and down four times, and thereby the reel stand can be selectively driven between a constant-speed drive system and a high-speed drive system. Therefore, without having to install two drive systems as in the past, by simply moving the drive gear driven by one drive system up and down, it is possible to switch between a constant speed running system and a high speed system. This results in two systems of drive including the travel system. This not only simplifies the structure and lowers the cost, but also makes it possible to downsize.

[Brief explanation of the drawing]

The figure shows an embodiment in which the present invention is applied to an 8 mm IJVTR.
The figure is a schematic plan view of the VTR with a tape loaded, FIG. 3 is a plan view of the main part of the reel stand drive device in stop mode equipped with a vertical switching mechanism, and FIG. 4 is the IN-IV of FIG. 3. Figure 5 is an exploded perspective view of the main parts of the vertical switching mechanism, Figure 6 is a plan view of Figure 3 and some shares in early arrival mode, Figure 7 is the line ■-■ of Figure 6. It is an arrow sectional view. In addition, in the symbols used in the drawings, 1......M slider (switching mechanism) 2......Take-up reel stand shaft 4...
......Control motor 16...
Supply reel stand shaft 19...Cam groove 20...Switching arm (switching mechanism)
21 ・・・・・・・・・Hi 25 ・・・・・・−・・・Vertical switching arm (switching mechanism) 28 ・・・・・・・・・Guide groove (switching mechanism) 34
...... Rotating lever (switching mechanism) 36 ・
...... Engagement shaft (switching mechanism) 38 ...
...... Rotating arm 41 ...... Drive gear 51 ...... Early spring gear (tooth type for high-speed running) 53 ...... Constant This is a speed winding gear (constant speed running gear).

Claims (1)

[Claims] The reel base is provided with two reel base gears, one for constant-speed running and one for high-speed running, above and below, a drive gear that meshes with the reel base gear, and a switching mechanism that moves this drive gear up and down. A mode switching device for a recording/reproducing apparatus, which is configured to move the drive gear up and down by a switching mechanism, thereby selectively switching the drive of the reel stand between a constant speed drive type drive and a high speed drive type drive.