JPH02236850A - Reel stand moving device - Google Patents

Abstract

PURPOSE:To facilitate large driving force, miniaturization and light weight of the subject device by converting rotary motion of a moving structural body including a reel turntable corresponding to a cassette size into linear motion using one motor, a worm wheel and a lever. CONSTITUTION:Now, when a M-size cassette is inserted in an L-size position, reel turntable bases 4 and 5 are moved to an M-size position by a size detecting signal so that a worm gear 13 is rotated by the motor 11 via a belt. Two worm wheels 14 on both sides of the worm gear 13 are meshed with each other to drive the reel turntable bases 4 and 5 on the supply side and on the take-up side respectively. The lever to be engaged with the worm wheel 14 is guided with its one end 15b in a guide groove 12 to be moved, and the reel turntable base 4 is moved. Then, a cam pin of the lever is regulated by a cam 36, and when the one end 15b of the lever 15 reaches a V-shaped notched part 30 for stop positioning provided in the guide groove 12, reel turntables 2 and 3 are held in their positions corresponding to the M-size cassette.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a system for positioning and fixing the reel stand of a cassette-type video tape recorder using tape cassettes with three types of reel hub spacings different from each other according to the type of cassette. This invention relates to a reel table moving device.

[Conventional technology]

Tape cassettes of different sizes (hereinafter referred to as cassettes)
For example, as a device for moving the reel stand according to the type of cassette so that the cassette can be placed,
There is a device described in No. 154. In the reel stand moving device that supports two cassette sizes as in this example,
A common method is to bring the base into contact with a block that supports a rail or the like that guides the base on which the reel stand is placed, and to hold it via a pressing spring. For the three cassette sizes, a drive source and a power transmission mechanism for moving the cassette along the guide, and a drive source and positioning mechanism for positioning were required. For example, a motor is used as the power source for moving the base, and the base is moved via a belt, gears, etc. In order to lock the reel in a predetermined position, a sensor is installed to detect the position of the base, and the motor is stopped by a signal from the sensor. However, even if the power to the motor is stopped, the base does not stop immediately, and its stopping position shifts due to its inertia.

When moving from the large cassette position to the medium cassette position, the direction of deviation when stopped is opposite when moving from the small cassette position to the medium cassette position, and it is possible to reduce or eliminate this amount of deviation below a certain level. This required a highly accurate detector and complex control.
Furthermore, the base that has completed its movement is also subjected to force due to the starting or stopping of the motor installed on the base. Many positioning mechanisms are used to resist this force and maintain a stable reel position. For example, by providing a V-shaped groove on the side surface of a movable base and pushing out a pin from a position corresponding to the groove, the center of the V-groove is guided to the center of the pin and is held in position. Additionally, most devices have a spring or the like interposed between the base moving mechanism and the base for this positioning operation. In Japanese Patent Application Laid-Open No. 62-92154 as a conventional example, a motor is also used as a power source for moving and positioning the base. Further, a plunger is required for switching the operation, and first and second braking means are also required.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, the power for moving the base and the power for positioning are obtained from a single drive source, which is a motor, and a differential mechanism is used. For this reason, power is required to convert one input into two outputs, that is, the movement and positioning of the base, and the plunger is used to operate two types of braking devices, and as the number of parts increases, the mechanism becomes more complicated. There were complications. An object of the present invention is to support three types of cassettes by moving a base on which a reel stand is mounted using a simple mechanism.
An object of the present invention is to provide a reel stand moving device that moves and reliably positions.

[Means to solve the problem]

The above objective is achieved by making the movement and positioning of the base a continuous movement. Hereinafter, the three types of cassettes, large, medium, and small, will be referred to as L, M, and S cassettes, respectively. The rotation of the motor, which is the drive source, is decelerated into the rotation of a rotating body such as a worm wheel, and a lever having an eccentric pivot point is provided on the rotating body such as the worm wheel.
The other end of the lever is engaged with a guide means such as a guide groove along the moving direction of the reel stand base. At a position corresponding to the M cassette, a stop positioning structure such as a V-shaped notch is provided in the guide means such as the guide groove. The above purpose is to provide a guide body such as a guide for sliding a moving structure including a reel stand, a motor as a drive source, a decelerated rotary body such as a worm wheel, and a rotary body provided on the rotary body. A lever for converting the rotational force of the rotating body into a linear driving force, a first moving body guide means such as a guide groove for engaging the lever with the moving structure, and a groove or length provided on the moving structure. a second movable body guide means such as a hole; a spring provided on the rotary body to apply a pressing force to the lever in the outer radial direction of the rotary body; a cam pin approximately in the center of the lever; and a cam pin engaged with the guide. This is achieved by an oval configuration with matching cams.

[For production]

The operation will be described below with the operation start state being when the reel stand base is in a position corresponding to the L cassette. When the motor, which is the drive source, rotates, it is decelerated and a rotating body such as a worm wheel is rotated. The end of the lever connected to the rotating body begins to move toward the M position along the movable body guiding means such as the guide groove. As the rotating body rotates, the direction in which the lever is pulled gradually changes, and the lever is positioned at the position of the movable body stop positioning structure, such as the V-shaped notch provided at the M position. The rotating body and one end of the lever are connected via a spring at a rotatable fulcrum, and the fulcrum is located eccentrically from the center of the rotating body. The spring acts to push the lever in the outer radial direction of the rotating body. When the driving point of the lever provided on the rotating body is on the line connecting the stop positioning structure such as the V-shaped notch and the center of the rotating body, the other end of the lever is positioned at the position of the positioning structure such as the V-shaped notch. Retained. When the rotating body rotates further, one end of the lever passes the fulcrum, and the other end of the lever is supported by the moving body stop positioning structure. After this, the guide pin provided almost in the center of the lever is regulated by a cam, and the other end of the lever is regulated by a V-shaped notch, and as the rotating body rotates, the V-shaped notch etc. stops. It is pushed out along the positioning structure, moves along the guide means such as the guide groove, and reaches the S position. Here the reel stand
The stopper comes into contact with a stopper, etc. The rotating body such as the wheel rotates further, the spring provided at one end of the lever is expanded again, and the toggle made up of the rotating body such as the worm wheel and the lever crosses the fulcrum point, and the rotation of the motor is stopped and the reel stand is rotated. The base is stable and securely positioned and held. Movement from the S position to the M position and the L position is performed by the reverse operation described above, and the reel stand base is positioned and held. [Example] Hereinafter, the device of the present invention will be described as a video tape recorder (VTR).
An example of use in this case will be explained with reference to Figs. 1 to 9. Figure 1 shows a plan view of the reel section on which the VTR cassette is placed and where the reel is wound and fed out. Figure 2 shows a side view of the structure in Figure 1. 1 is the board, 2 and 9 are the reel stands. It is attached to a reel motor 6.7 placed on a reel base 4.5 as a moving structure including a reel base, and the rotation of the reel motor drives the reel hub engaged with the reel bases 2 and 3, and the tape is rotated. Performs winding and unwinding. The reel stand base 4.5 is slidably attached to guides 8a, 8J and 9a, 9II, which are provided in parallel thereto. A sub-board 10 is provided on the board 1 and is provided with a guide groove 12 as a first movable body guiding means. A V-shaped notch 30 is provided in the guide groove 12 provided in the sub-board 10 in the middle of its stroke as a movable body stop positioning structure corresponding to the reel hub spacing of the M size cassette. The movable body that moves in the guide groove 12 is the upper end of the guide pin 15z. A roller 21 is provided coaxially with the guide pin 15z.
The guide groove 12 is sandwiched between the rollers 21 and 5.

A cam 36 is integrally provided on the back surface of the sub-board 10. Further, a worm gear 13 is provided on the center line of the reel stands 2 and 3 of the board 1, and is connected to a motor 11 attached to the lower part of the worm gear via a belt 31. Worm wheels 14 as rotating bodies are engaged with both sides of the worm gear 13, respectively. A fulcrum 15a at one end of the lever 15 is placed on the worm wheel 14 so as to be able to slide and rotate.
4 is pushed outward. A guide pin 15z is provided at the other end of the lever 15, and is engaged with a guide groove 12 provided in the sub-board 10 so as to be movable along the guide groove.

Further, a cam bin 35 is provided approximately at the center of the lever 15.

The reel stand bases 4 and 5 engage with the guide pin 151 via a groove 20 serving as a second movable body guide means provided orthogonally to the moving direction of the reel stand, and the guide pin 15z As the reel stand bases 4 and 5 move, the reel stand bases 4 and 5 move on the guides 8 and 9. On the sub-board 10 are L position and M position.
Sensors 17L, 17M, 17 corresponding to position and S position
S is provided.

A gear section is provided at the bottom of the worm wheel 14, and the arrow 33 rotates via the idler gear 32 in accordance with the rotation of the worm wheel 14. The sensor is composed of a photointerrupter, and when the arrow 33 interrupts the optical path, it detects the rotational position of the worm wheel 14 and, as a result, the positions of the reel stands 2 and 3. Reference numeral 34 indicates a stopper, which prevents the abnormality-free lever 15 from rotating. Next, the operation will be explained. FIG. 9 shows tape cassettes 18S, 18M, and 18L. By positioning the reel stands 2 and 3 according to the reel spacing of the cassette, the cassettes 18S and 18 of each size are
M, 18L can be used. FIG. 1 shows a state in which the largest cassette 18L is set to a usable reel spacing. Here, M size cassette 18 with different cassette sizes
The operation of the reel bases 4 and 5 when using M is described below. When an M-sized cassette 18M is inserted into the cassette insertion slot, a cassette size detector provided in the cassette insertion slot detects that the size of the inserted cassette is M (not shown). A system control circuit (not shown) applies voltage to the motor 11 in order to move the reel pads 4 and 5 to the position of the cassette size M based on the signal from the cassette size detector. When the motor 11 is energized, the rotation of the motor 11 is transmitted to the worm gear 13 via the belt. Worm wheels 14 are engaged with both sides of the worm gear 13, respectively. The worm wheel 14 and the reel bases 4 and 5 operate symmetrically, with the left worm wheel driving the supply reel base 4 and the right worm wheel driving the take-up reel base 5. Due to the rotation of the motor 11, the left worm wheel 14
is rotated clockwise in FIG.
The reel stand base 4 moves as the guide pin (guide pin) moves while being guided by the guide groove 12. FIG. 3 shows the state of the worm wheel 14 and reel stand bases 4 and 5 just before they are positioned at the M size cassette position. When the worm wheel 14 further rotates, the cam bin 3 provided on the lever 15
5 is regulated by a cam 36, one end 15+r of the lever 15 is guided by an end surface 30a of a V-shaped notch 3o of a stop positioning structure for M cassette provided in the guide groove 12,
It is guided to the V-shaped notch 3o of the stop positioning structure corresponding to the cassette (FIG. 4).

When the worm wheel 14 rotates further, the fulcrum 15 of the lever 15 (Z is the spring 16 provided on the worm wheel 14)
It rotates while moving toward the center of the worm wheel 14 against the force of. When the lever 15 comes to the center of rotation of the worm wheel 14, the sensor 17M detects the position of the lever 15 and stops energizing the motor 11. The reel stand 2.3 is compatible with the M size cassette 18M. It is positioned and held in position. This state is shown in Figure 5. Next, we will describe the movement when the S-size cassette 18S is inserted when the reel stand 2.3 is in a position corresponding to the M-size cassette 18M (position 1M in FIG. 5). As described above, the size of the cassette is detected in the cassette insertion section, and energization of the motor 11 is started. As the motor 11 rotates, the worm wheel 14 begins to rotate clockwise. At this time, the fulcrum 15a of the lever 15
The spring 16 provided on the worm wheel 14 is stretched, and the worm wheel 1 is stretched to the position shown in FIG.
4 rotates, the reel stand bases 4 and 5 do not move. This state is shown in Figure 6. At this time, Arrow 33 moves,
The sensor 17M is in a state where light passes. When the worm wheel 14 further rotates, the movement of the cam pin 35 provided on the lever 15 is regulated by the cam 3flzz, so the other end 15z of the lever 15 is connected to the V-shaped notch 30 of the guide groove 12 provided on the sub-board 10. is extruded along the end face 30z of. Figure 10 shows the main part of the state at this time. As a result, it moves to the position shown in Figure 7. When the worm wheel 14 further rotates, the lever 15
moves the guide pin 15z engaged with the guide groove 12, and moves the reel stand base 14.15 to the S position side in the guide groove 12.
Extrude along. Furthermore, when the worm wheel 14 rotates, the reel stand bases 4 and 5 move the stopper part 12.
8 and reaches the position corresponding to the S cassette. When the worm wheel 14 further rotates, the fulcrum 1 of the lever 15
5a moves toward the center of the worm wheel 14 against the spring 16 and crosses the line connecting the fulcrum 15a of the lever 15 and the center of rotation of the worm wheel 14 (crosses the fulcrum), resulting in the state shown in FIG. 8. ．． At this time, the position of the lever 15 is detected by the sensor 17S, and the power supply to the motor 11 is stopped. Figure 8 shows the state at this time. Note that the reel stand moves from the S size cassette position to the M size cassette position, and from the M size cassette position to the L size cassette position.
Needless to say, the movement to the size cassette position is achieved by the completely opposite operation to the movement from L to M and from M to S described above. Positioning of the reel stands 2 and 3 according to the cassette size is as follows:
The force of the spring 16 provided inside the worm wheel 14 is used in a toggle manner, and even though the torque for rotating the worm wheel is small, sufficient positioning and holding force can be obtained. By attaching a member provided with a groove 20 perpendicular to the guide groove 12 provided on the reel stand base 4.5 as a separate member to the reel stand base 4.5, it is possible to move the reel stands 2 and 3. It is easy to remove each base 21 of the unit, which improves serviceability, especially simplifying maintenance and inspection. As described above, in this embodiment, the groove 20 in the direction perpendicular to the moving direction of the reel stand 2.3 is provided as the second movable body guide means, but other configurations such as a substantially rectangular hole may be used as the guide means. It's okay. Further, in this embodiment, the guides 8 and 9 as guide bodies, the guide groove 12, the V-shaped notch, the lever 15, and the worm wheel 14 as the rotating body are used as the first and second guide means. Although the configuration is such that two reel stands are installed in pairs and moved at the same time, it is also possible to use a configuration in which one or one set of each of these parts is provided and only one reel stand on the other side is moved. good. The guide body, the first and second movable body guide means, the lever 15, the rotating body (worm wheel 14
), by providing the spring 16 within the distance between the centers of the reel stands 2 and 3, the present moving device can be significantly downsized.

When the reel stand moving device of the present invention is used in a VTR, V
TR can be used to make it smaller, lighter, and lower cost. In this embodiment, the VTR that can use L, M, and 33 types of sets will be described, but it goes without saying that it can also be used with a VTR that supports two types of secats. The V-shaped cutout for positioning the reel at the position corresponding to the M cassette is made asymmetrical with respect to the perpendicular line of the guide groove 20 as shown in this embodiment, and by moving it closer to the pushing direction of the lever, it can be applied to the motor. It is possible to reduce the load. Furthermore, the same effect can be obtained even if the V-shaped notch is formed by a curved line. [Effects of the Invention] According to the present invention, the movable structure including the reel stand can be easily and reliably moved and reliably stopped at a predetermined position using one motor, corresponding to each cassette size. ．． In particular, a mechanism that converts rotational motion into linear motion using a worm wheel and lever is easy to configure, easy to obtain a large driving force, and easy to downsize.

Furthermore, there is no need for parts such as braking mechanisms, devices, and solenoids for positioning the reel stand base.6 Therefore, the entire reel stand moving device can be made significantly smaller, lighter, and lower in cost. Furthermore, magnetic recording/reproducing devices such as VTRs using this can be made smaller, lighter, and lower in cost.

[Brief explanation of drawings]

FIG. 1 is a plan view when the reel stand in one embodiment of the present invention is positioned at a position corresponding to the L cassette;
The figure is a side view of Figure 1, Figures 3 and 4 are plan views of the state just before the reel stand is positioned in a position corresponding to the M cassette, and Figure 5 is a plan view of the reel stand positioned in a position corresponding to the M cassette. Figures 6 and 7 are plan views of the state immediately before it starts to move from the M position to the S position. Figure 8 is a plan view of the case when it is positioned to the position corresponding to the S cassette. Figure 9 10 is a plan view showing the L, M, and S cassettes, and FIG. 10 is an enlarged plan view illustrating the operations of the cam 36 and guide pin 35, which are the main parts of the present invention. 1... Board, 2, 3...
... Reel stand, 4, 5... Reel stand base, 8, 9.
...Guide, 10...Sub board, 11...Motor,
12... Guide groove, 13... Worm gear, 14...
...Worm wheel, 15...Lever 17S, 17
M, 17L...Sensor 18S, 18M, 18L.
...Cassette, 20...Groove, 21...Roller, 33
...Arrow 35...Cam pin, 36...Cam.

Claims (1)

[Claims] 1. Guide bodies (8, 9) for holding the movable structure including the reel stand (2, 3) via a sliding part provided at its periphery.
A reel stand (2) is provided parallel to the longitudinal direction of the guide bodies (8, 9) and is located approximately in the center of the longitudinal direction.
, 3), a first movable body guide means (12) having a movable body stop positioning structure (30) at a position corresponding to the interval between the movable body guide means (12), and a movable body guide means (12) provided on a movable body including the reel stand (2, 3). a second movable body guide means (20) having a movable range at least in a direction perpendicular to the longitudinal direction of the body (8, 9) and the first movable body guide means (12); a lever (15) having one end slidably engaged with the movable body guide means (12, 20) of No. 2, and the other end of the lever (15) being provided at a position eccentric from the center of rotation thereof; A rotary body (14) is engaged with and supported so as to be rotatable about a fulcrum (15a), and one end is connected to the rotary body (14).
) is fixed on the top of the rotating body (14) and uses its elastic force to press the lever (15) in the outer radial direction of the rotating body (14).
16), a cam pin (35) located approximately in the center of the lever (15), a cam (36) that engages with the guide pin, and a motor (11) for rotationally driving the rotating body (14). The rotating body (14) is rotationally driven by the rotational force of the motor (11), and one end of the lever (15) is rotationally driven, so that the other end of the lever (15) is rotated between the first and second ends. moving body guidance means (
12, 20), and the moving structure is configured to slide on the guide bodies (8, 9) to move the reel stands (2, 3). Reel stand moving device. 2. The reel platform moving device according to claim 1, wherein the movable body stop positioning structure provided on the first movable body guide means (12) is constituted by a V-shaped notch provided on the side surface of the movable body guide means. . 3. The reel stand moving device according to claim 2, wherein the guide surface of the V-shaped notch is configured to be different in the longitudinal direction of the first movable body guide means (12). 4. In any one of claims 1 to 3, the guide bodies (8, 9), the first and second movable body guide means (1
2, 20), a lever (15), a rotating body (14), and a motor (11) are provided within the distance between the centers of the reel stands (2, 3). 5. In any one of claims 1 to 4, the rotating body (14) is a worm wheel (14) that meshes with a worm gear (13) and moves.
A reel stand moving device using 6. A magnetic recording and reproducing device comprising the reel table moving device according to any one of claims 1 to 5.