JPS58153262A - Tape loading device - Google Patents

Abstract

PURPOSE:To prevent a tape from falling off from a rotating body and to improve the reliability of a device by controlling the widthwise movement and circumferential movement of the tape with relation to the rotation of the rotating body. CONSTITUTION:The diameter D1 of timing gears 20 and 21 is less than the diameter D2 of a cam disk 29, main gear 28, and angle detection disk 30. Consequently, the cam disk 29, main gear 28 and angle detection disk 30 projects from the timing gears 20 and 21 externally. With regard to the timing gear 21, a roll 62 for belt fall-off prevention is provided and an enough gap to pass a belt 23 is provided between the roll 62 and gear 21. The roll 62 is supported pivotally on a vertical shaft 67 supported between a chassis 2 and an upper fitting plate 59. With regard to the lower timing gear 20, a driving gear 80 is provided and is meshed with the main gear 28 with enough length for downward excessive extension. This lower part 80a is spaced oppositely to the timing gear 20.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape loading device, and particularly to a device that runs a belt-shaped body such as a timing belt to move a loading member and load the tape in a predetermined path. It is an object of the present invention to provide a tape loading device that can improve reliability by preventing such problems.

The present applicant previously disclosed in Japanese Patent Application No. 55-28909 ``Tape Automatic Loading Device'' etc. that an endless timing belt is wound around a timing gear, the timing gear is rotated to run the timing belt, and An apparatus has been proposed in which a connecting rope ink hole is moved, the tape is pulled out from the cassette, and the tape is loaded onto a predetermined path attached to a guide drum at a predetermined angle. In this device, the mounting path of the timing belt is simple, and since the timing belt hardly vibrates during running, there is no risk of the belt coming off the timing gear, so the timing belt is prevented from falling off the timing gear. There is no mechanism in place to do so.

However, as equipment becomes smaller, the mounting path for the timing belt becomes more complex, and the belt tends to vibrate during driving, making it necessary to have a mechanism to prevent the belt from falling off the timing gear. .

The present invention has been made in view of the above, and one embodiment thereof will be described below with reference to the drawings.

Figures 1 and 2 respectively show the state of the recording and/or reproducing apparatus 1, to which the tape loading device of the present invention is applied, in the stop mode and in the recording/reproducing mode.

This recording/reproducing device 1 includes a guide drum 6 mounted on a chassis 2.
, cassette mounting part 4, etc. are provided, and # is also provided on the top and bottom surfaces of the chassis.
It has a general configuration including a tape mounting a11616 and the like shown in FIG. This recording and reproducing apparatus 1 is a dedicated machine for the small cassette 10 shown in FIG. 4, and is smaller than the recording and reproducing apparatus for standard type cassettes.

This recording/reproducing device 1 includes a small cassette 1 shown in FIG.
0 is installed. As shown in the figure, this small cassette 10 consists of a cassette housing 12 that houses a magnetic tape 11, and a lid 13 that is openable and closable on the front side and is normally closed.

As shown in FIG. 1, the cassette housing 12 has a small-diameter supply reel 14 and a take-up reel 15 arranged side by side.

The supply reel 14 is connected to the opening 16 at the bottom of the cassette housing 12.
It is out in the world. The outer periphery of the lower seven lunges of the take-up reel 15 is a gear portion 17, and a portion of the gear portion 17 is exposed through a side window 18 of the cassette housing 12. The magnetic tape 11 has guide balls 19a and 19b on the left and right ends.
A tape path 11A is formed along the front surface of the cassette 9 body 12 as guided by the cassette. Further, at both ends of the magnetic tape 11, transparent tape portions (not shown) of a predetermined length are provided which are detected by tape end detection means. This transparent tape portion includes the light emitting source 160 and the end sensor 133 facing thereto.
and a start sensor 134. This tape end detection operation is for tape 1
1 forms a loop 11B.

The tape loading mechanism 6 of the recording/reproducing apparatus 1 and related mechanisms will now be described with reference to FIGS. 5 to 9.

In the tape loading mechanism 6, the timing belts 22, 25 run as the timing gears 20, 21 rotate, and the loading balls 24, 25 move the chassis from the position shown in FIG. 1 to the loading completion position shown in FIG. The tape is moved along the two guide grooves 26 and 27 to load the tape into a predetermined tape bus.

The timing gears 20 and 21 are superimposed with the main gear 28 in the center, the cam disc 29 at the top, and the angle detection disc 60 at the bottom, so that the main gear 28 corresponds to the horizontal position of the chassis 2, and the gears 20, '21 The main gear 28 and pin 32 are connected to the main angle detection board 60, and the timing gears 20 and 21 are connected to the pin 3 by coil springs 33 and 34.
The cam disk 29, the angle detection disk 30, and the timing gears 20 and 21 are rotated approximately 360 degrees clockwise during loading and counterclockwise during unloading, substantially integrally with the main gear 28.

The timing belt 22 runs along the timing gear 20 and the guide rollers 35 to 38, with one end directly attached to the loading ball support 39 and the other end attached to the fill spring 4.
0 to the same support base 39, and the chassis 2
A closed loop is formed along the lower surface side of the . Another timing belt 25 is passed along the timing gear 21, the inner rollers 41 to 43, and the stop ball 44, with one end directly attached to the loading ball support 45 and the other end attached to the coil spring 46. It is connected to the same support stand 45 via the support base 45, forming a closed loop along the upper surface side of the chassis 2. The support stands 39 and 45 are respectively connected to the guide groove 26.
27 so as to be movable along it.

The cam disc 29 has a substantially spiral cam groove 47 formed therein.

This rotation of the cam disk 29 moves the audio control head 4B and the pinch roller 49 as described later. Before loading the tape, as shown in FIG. 1, the head 48 is retracted from the guide groove 27 and is in a position where it does not interfere with the tape loading operation, and the pinch roller 49 is separated from the cassette mounting section. The head 48 is mounted on the tip of a support arm 51 that is supported on a shaft 50. The auxiliary arm 52 is pivotally supported by a pin 54 on the support arm 51, and has a pin 55 at its tip. The pin 55 fits into the cam groove 47. Also, the pin 56 of the auxiliary arm 52 is connected to the support arm 51.
It fits into the elongated hole. A torsion spring 57 is provided between the support arm 51 and the auxiliary arm 52.
The spring 57 urges the auxiliary arm 52 counterclockwise. Further, a bell crank lever 58 is pivotally supported by a pin 60 on a mounting plate 59, and a pin 61 of the lever 58 is fitted into a cam groove 47. 62 is for preventing the belt 23 from slipping.

The angle detection board 60 has a reflection plate 63 of a predetermined shape attached to its lower surface. Five light-emitting/light-receiving elements 64, 65, and 66 are fixed on a base facing the reflecting plate 63. Reflector 6
3 and each of the elements 64 to 66 cooperate to detect the rotation angle position of the detection plate 30, that is, the cam plate 29, and the timing gears 20 and 21, and determine the tape loading operation and the like.

Next, the operation of the recording/reproducing apparatus 1 having the above configuration will be explained.

The small cassette 10 is inserted into the housing 70, moved down, and mounted on the cassette mounting portion 4 as shown in the cylinder 1 diagram. The lid 15 is opened by the lid opening mechanism 71 as shown in FIGS. 2 and 4, and the supply reel 14 is opened by the supply reel stand 7.
2, and the gear portion 17 of the take-up reel 15 meshes with the small diameter gear 75a of the tape winding gear body 75. Furthermore, loading balls 24, 25, tension ball 7
4 and the capstan 75 relatively enter into the front notch of the small cassette 10.

Next, when a recording or reproducing operation is performed, the loading motor 76 is started, and the timing gear 20,
21, cam disk 29, and angle detection disk 30 are the main gear 2
8 in the clockwise direction (direction of arrow A1).

Due to the rotation of the timing gears 20 and 21, the timing belts 22 and 25 run in the directions of arrows B and C, and the support base 39
．． 45 move along guide grooves 26, 27, respectively. At this time, the balls 2'4 and 25 lock the magnetic tape 11 and pull it out from the cassette 10. The two supports 59 push aside the impedance roller 81 and move, and finally the loading ball 24 is pressed against the stopper 82 .

The impedance roller 81 and the full-width erase head 83 are fixed on a rotary support base 85 supported by a ball 84, and both are positioned by a coil spring 86 and a stopper 87. The support stand 45 moves past the front side of the head 48 which is in the retracted position, and finally the loading ball 25 is pressed against the stopper 8B.

Also, due to the rotation of the cam disk 29, the loading ball 25
After the pin 55 passes in front of the head 4, the pin 55 moves into the cam groove 47.
The cam disk 29 is guided by the cam disk 29 and is displaced toward the outer circumference of the cam disk 29. As a result, the support arm 51 and the auxiliary arm 52 rotate together clockwise, and the head 48 approaches the magnetic tape 11 pulled out of the small cassette 10 and attaches thereto. Finally, as shown in FIG. 2, the auxiliary arm 52 rotates independently of the support arm 51, and the support arm 51 is biased clockwise by the spring force of the torsion spring 57, causing the stop ball to rotate. 44, head 48
is positioned.

Further, due to the rotation of the cam disk 29, the lever 58 is moved to the pin 61.
is inserted into the cam groove 47 and rotated counterclockwise, and via the connecting levers 90 and 91, the pinch roller support arm 92
rotates counterclockwise about shaft 9'5, and pinch roller 49 presses against capstan 75. pinch roller 49
The pressing force against the capstan 75 is obtained by the spring force of the fill spring 94 between the levers 90 and 91.゛Also, due to the rotation of the support arm 51, the lever 100
The L-shaped lever 101 rotates clockwise about the shaft 102 through the
is rotated clockwise by spring 105. The string 103 is guided by guide rollers 106 and is mounted at right angles along the periphery of the device, and is connected to the lever 101 and the L-shaped lever 1.
04 is connected. When the lever 104 rotates, the tension arm 107 is moved toward the shaft 1 by the spring 108.
Tension ball 7 rotates counterclockwise about 09.
4 reaches the operating position and the brake band 110 is tensioned.

From this point K, the recording/reproducing device @1 is in the state shown in FIG. roller 8
Attach to 1. The magnetic tape 11 further includes balls 24 and 2.
5 and is helically attached to the surface of the guide drum 3 having a rotating video head. Tape 11 is guide drum 3
Video signals are recorded or reproduced by the pressure of the rotating video head while the video signal is traveling along the video head.

The tape 11 released from the guide drum 6 is attached to the audio control head 4.8K, is guided to the guide goal 112, is driven to be pinched by the pinch roller 49 and the capstan 75, and enters the cassette 10. Then, it is wound onto the take-up reel 15. Capstan 75 is rotated by capstan motor 116.

Also, the reel drive motor 120 on the lower side of the cassette mounting section 4
rotates clockwise, the oscillating idler 121 that is in pressure contact with the rotating shaft 120a rolls on the idler movement support plate 122 and moves the large diameter gear 7 of the gear body 73.
3b and comes into pressure contact with the intermediate gear 123. As a result, the rotation of the motor 120 is transmitted to the take-up reel 15 via the idler 121, the intermediate gear 123, and the gear body 75, and this is rotated clockwise. Rotate to wind up the tape.

Further, the plunger solenoid 125 is energized and the sliding plate 126 moves to the left. As a result, the brake shoes 127 and 128 are connected to the supply reel stand 72 and the gear body 7, respectively.
3 and the brake is released.

When a stop operation is performed during the recording/reproduction mode, the mechanisms that operated during the tape loading operation operate in the reverse order and in the reverse direction to perform the unloading operation.

In addition, a shaft 31 coaxially supports the timing gear (rotating body for moving the hoist side loading pole) 20 and the timing gear (rotating body for moving the supply side loading pole) 21.
is installed on a lower mounting plate 68 that is attached to the chassis 2, and its top portion is fixed to the upper mounting plate 59 with screws 69. Also, the timing gear 20 drives and runs the timing belts 22 and 23 by its rotation.
, 21 are coaxially arranged and arranged at the same location, the installation space (area) is small, the tape loading mechanism 6 is small, and the recording/reproducing device 1 can be configured in a small size. . Further, FIG. 9 shows the structure of the connecting portion between the timing belt 26 and the support base 45.

Here, the diameter of the timing gears 20 and 21 is Dl, and the diameters of the cam disc 29, the main gear 28, and the angle detection disc 30 are a diameter D2, which is larger than the above-mentioned diameter D1. As a result, when these are stacked and combined as described above, the sixth
As shown in the figure, the cam disk 29, the main gear 28, and the angle detection disk 30 are in a state where they protrude further outward than the timing gears 20 and 21. The overhanging portion 28a of the main gear 28 and the overhanging portion 30a of the angle detection board 30 function as a flange of the lower timing gear 20. Overhanging portion 29a of cam disk 29 and overhanging portion 28 of main gear 28
a functions as the seventh lunge of the upper timing gear 21. Therefore, the timing gears 20, 21 have the same structure with flanges, and the timing belts 22, 23
Movement in the belt width direction is restricted around the timing gears 20 and 21.

Further, as shown in FIG. 7, a roller 62 for preventing the belt from coming off is provided in conjunction with the upper timing gear 21. This roller 62 has a belt 26 between it and the gear 21.
When the belt 23 attempts to move in the outer circumferential direction (horizontal direction) of the gear 21, this outer surface is locked to prevent the belt 23 from moving in the outer circumferential direction of the gear. Restrict. Note that this roller 62 is
It is rotatably supported on a vertical shaft 67 supported between the upper mounting plate 59 and the upper mounting plate 59, and its upward movement is restricted by a regulating bushing 62a. Further, the bushing 62a may or may not rotate. Also, the bushing 62a may be integrated with the roller 62, but in this case,
The rotation of the roller 62 may not be smooth, which is not preferable.

Further, as shown in FIG. 8, a drive gear 8o is provided in conjunction with the lower timing gear 20. This drive gear 80 meshes with the main gear 28, but has a length that extends downwardly, and this lower portion 80a is spaced apart from and opposed to the timing gear 20, and is connected to the roller 62. As in the case, the movement of the timing belt 22 in the outer circumferential direction of the gear 20 is restricted.

In addition, the guide groove 26.27 and the timing belt 22.2
3, the total length of the loop made up of the timing belt and the coil spring gradually changes during tape loading and unloading operations. The change in the overall length of the loop is absorbed by the expansion and contraction of the coil springs 40 and 46. For this reason, the timing belt 22
, 23 are running, the coil springs 40, 46 are expanded and contracted, and the timing belts 22, 23 are subjected to shocks due to the expansion and contraction of the coil springs 40, 46, making it easier to photograph the timing gears 20, 21. It moves vertically and horizontally and tries to fall off.

However, according to the embodiment described above, the displacement of the belt 22° 26 in the belt width direction around the gear 20.21 is limited by the respective overhangs 28a, 29a, 30a, and furthermore, the displacement of the belt 22° 26 in the belt width direction around the gear 20.21 is limited. This movement in the outer circumferential direction is stopped and restricted by the lower portion 80a of the drive gear 80 and the roller 62 before reaching the outer edges of the overhanging portions 28a, 29a, 30a. As a result, the belts 22 and 23 will be able to
It is prevented from falling off from each timing gear 20° 21 and is securely held in a state of meshing with the gear 20° 21.
The tape loading device is driven and runs normally and has excellent reliability.

As described above, in the tape loading device of the present invention, the rotating body rotates, the loop-shaped band wrapped around the rotating body runs, and the loading member moves to pull out the tape from a cassette or the like and attach it to the drum. In the device for loading onto predetermined paths that are in contact with each other, a width direction drop-off prevention means for restricting movement of the strip in the width direction in relation to the rotation of the rotating body to prevent the strip from falling off from the rotating body; Since the configuration is provided with a means for preventing the strip from falling off in the outer circumferential direction of the rotating body by restricting the movement of the strip in the outer circumferential direction of the rotating body, it is possible to prevent the strip from falling off during the tape loading operation. No matter how large the shooting distance is, the band can be reliably kept wrapped around the rotating body, thereby preventing the band from falling off the rotating body, improving the reliability of the device. This makes it suitable for small-sized recording and reproducing devices where the belt-like body tends to vibrate, and furthermore, means for preventing it from falling off in the width direction are arranged above and below the rotary body, and it is possible to use a disk member with a larger diameter than this. Since it is constructed using the above-mentioned method, it has the advantage that a member for discriminating is not required for this purpose.

[Brief explanation of drawings]

FIGS. 1 and 2 respectively show the state of a recording and reproducing apparatus to which an embodiment of the tape loading apparatus according to the present invention is applied, before loading the tape, and the state in the recording and reproducing mode after completing tape loading. 6 is a perspective view showing the tape loading mechanism shown in FIG. 1, and FIG. 4 is a perspective view of the small cassette attached to the recording/reproducing apparatus shown in FIG. 1 with the lid open. Fifth
The figure is an exploded perspective view showing the structure of the timing gear mechanism part in Figure 6, Figure 6 is an elevational view of the timing gear mechanism part, and Figure 7 is a horizontal direction of the belt wound around the upper timing gear. Figure 8 is a perspective view showing the mechanism for preventing the belt from coming off in the horizontal direction taken out, and Figure 9 shows the timing belt and coil spring. It is a figure showing the structure of the connection part with a support stand. 1... Recording and reproducing device, 3... Guide drum, 4...
・Cassette mounting section, 5... Tape end detection means, 6'@
0 tape loading mechanism, 10...small cassette, 11@■
magnetic tape, 12... cassette housing, 13---lid,
14@... Supply side reel, 15... Take-up reel, 2
0.21@...timing gear, 20a, 21a...
・・Sector-shaped relief hole, 22.23・・Timing belt,
24.25- Loading ball, 26, 27...
Guide consideration, 28...Main gear, 29.e.cam disk,
'50... Angle detection board, 28a. 29a, 30a... overhang, filter 1... support, 3
5~38.11~46-...Guide roller, 40.46@
...Coil spring, 47...Cam m, 48"...Audio control head, 49...Pinch roller,
59.68...Mounting plate, 62 +1@I belt removal prevention roller, 70-...Housing, 75...φ capstan, 76...Loading motor, 83- full width erasing head. Figure 6 Figure 7

Claims (1)

[Claims] (υ When the rotating body rotates, a loop-shaped band wrapped around it runs, and a loading member moves to pull out the tape from a cassette or the like and load it onto a predetermined path attached to the drum. In the apparatus, the widthwise falling-off prevention means restricts the movement of the strip in the width direction in relation to the rotation of the rotating body, and prevents the strip from falling off from the rotating body; A tape loading device comprising an outer circumferential fall prevention means for restricting the movement of the strip in the outer circumferential direction of the rotating body to prevent the strip from falling off from the rotating body. The tape according to claim 1, wherein the directional drop-off prevention means is an outer peripheral side overhang of a disc member having a diameter larger than the diameter of the rotating body and stacked on the upper and lower sides of the rotating body. Loading device.