JPS61233454A - Tape loading device - Google Patents

Abstract

PURPOSE:To load a tape very safely without damaging the tape and simplify structure of the device by tilting a subloading device gradually adapting to the change of twist of the tape. CONSTITUTION:At the time of main loading, a main loading device 10 in the tape taking up side comes into contact with the tape 4 at a position shown by alternate long and two short dash lines and then moved horizontally in the direction of the arrow mark d in vertical state to the position shown by solid lines. On the other hand, a main loading device 9 in the tape supply side comes into contact with the tape 4 in vertical state at a position shown by alternate long and two short dash lines, and then lowered in the direction of the arrow mark (c) to the position of movement shown by solid lines while being tilted gradually from the vertical state. Twist having upward slanting angle is generated in the tape. A sub-loading device 7 is tilted gradually by a tilting controlling mechanism following up tilting of the main loading loading device 9. When the main loading device is moved to the position of going movement and loading is completed, a tension detecting device 11 is made to come into contact with the tape.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Outline of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Effect G. Example G1 General description of the entire tape loading device (see Fig. Figure 3) G! Explanation of the tilt control mechanism of the sub-loading means (first
(Figs. 4 to 6) Description of the position control mechanism of the G3 tension detection means (Figs. 1 and 7) H Effect of the invention A Industrial field of application The present invention is applicable to, for example, a cassette video tape recorder. The present invention relates to a tape loading device which is most suitable for the application, and which winds a tape pulled out from a loaded cassette around the circumferential surface of a rotating head drum in an approximately Ω-shape in a helical state.

B. Summary of the Invention The present invention uses a pair of left and right sub-loading means and a pair of left and right main loading means to pull out the tape in the loaded cassette to the left and right sides of the front of the cassette, and to draw out the tape in the cassette in front of the cassette. In a tape loading device such as a cassette-type video tape recorder, the tape is wound spirally around the circumferential surface of a rotary head drum in an approximately Ω width, and the pulled-out tape is also brought into contact with a tension detecting means. At least one of the sub-loading means is gradually tilted from a vertical position in order to adapt to changes in the twist gradually imparted to the tape as the tape is gradually wound helically around the circumferential surface of the rotary head drum. At the same time, the tension detecting means is moved to a non-operating position where it does not come into contact with the tape until the main loading means is moved back and forth from the backward movement position to the backward movement position, and the main loading means is By moving the tension detection means to the operating position where it is in contact with the tape almost at the same time as the tape finishes being moved forward to the forward movement position, it is possible to load the tape extremely safely without damaging the tape. This is what I did.

C. Conventional technology Conventionally, in tape loading devices such as cassette video tape recorders, a rotating head drum is placed in front of the loaded cassette, and a rotary head drum is placed in front of the loaded cassette, and the drum is pulled out to the forward movement position in the cassette and to the left and right sides of the front of the cassette. A pair of left and right sub-loading means that can freely reciprocate between the forward position and a forward position; It has a pair of main loading means and a tape tension detection means, and the sub-loading means pull out the tape in the cassette to the front left and right sides of the cassette, and the main loading means pull out the tape in the cassette around the rotating head drum. There is one in which the tape is spirally wound around the surface in an approximately Ω shape, and the pulled out tape is also brought into contact with the tension detection means.

D Problems to be Solved by the Invention This type of tape loading device is characterized by a twist (with an upward or downward inclination angle) given to the tape spirally wound around the peripheral surface of the rotary head drum by the main loading means. ) to the cassette, it is necessary to incline the sub-loading means at a predetermined angle with respect to the main loading means at the forward movement position.

However, most of the conventional tape loading devices of this type simply move a sub-loading means, which is designed to have an inclination when loading is completed, forward from a backward movement position to a forward movement position. Therefore, conventionally, the twist of the tape changes during loading (the twist of the tape is caused by the tape being gradually wound spirally around the circumferential surface of the rotating head drum), which gradually increases, and when the loading is completed, the twist of the tape is changed. The twist of the sub-loading means is maximum.) The change in the inclination and height of the sub-loading means was not adequately designed.

As a result, conventionally, due to changes in the twist of the tape during loading, a difference in tension tends to occur between the upper and lower edges of the tape between the sub-loading means and the main loading means, and the upper and lower edges of the tape tend to stretch into a seaweed shape. It was easily damaged.

Further, in most conventional tape loading devices of this type, the tape is brought into contact with a tension detection means during loading.

However, since the tension detection means is designed to be brought into contact with the tape at a predetermined inclination (perpendicular to the tape center) when loading is complete, the tape may come into contact with the tension detection means during loading. If this occurs, the tape is likely to be forcibly twisted or the tape bus state may be unexpectedly changed from its normal state.

As a result, in the past, the tape was forcibly twisted by the tension detection means during loading, or the tape bus state was unexpectedly changed from the normal state, and the tension detection means or the tape guide located near it The tape was easily damaged by the upper and lower flanges, etc.

Particularly in recent years, the thickness of tape materials has tended to become very thin for long-term recording purposes, making tapes increasingly susceptible to damage. In addition, even with conventional tape loading devices of this type, damage to the tape can be reduced by significantly lowering the tape tension during loading.
If the tape tension is significantly lowered, the tape tends to loosen or run out of control during loading, and the tape tends to fall off the guides, making loading impossible, so there is a limit to how much the tape tension can be lowered.

The present invention prevents a tension difference between the upper and lower edges of the tape between the sub-loading means and the main loading means due to a change in the twist of the tape during loading, and also prevents the tape from being twisted during loading using the tension detection means. This prevents the tape from being forcibly twisted or from unexpectedly changing the bus state of the tape from its normal state.

E. Means for Solving the Problems The present invention provides the above-described tape loading device, in which:
At least one of the above (for example, the tape supply side) is adapted to the change in twist that is gradually applied to the tape when the tape is gradually wound spirally around the circumferential surface of the rotary head drum by the main loading means.
A tilt control mechanism is provided to gradually tilt the sub-loading means from the vertical position, and the tension detecting means is brought into contact with the tape until the main loading means is moved forward from the backward movement position to the negative movement position. A position control mechanism is provided for moving the tension detecting means to a non-operating position in which the tension detecting means is in contact with the tape almost at the same time as the main loading means finishes moving forward to the forward position. It is something.

F. Function The present invention gradually tilts the sub-loading means from a vertical position to accommodate changes in the twist of the tape that is gradually applied by winding the tape in a spiral manner around the circumferential surface of a rotating head drum. The tilt of the means will accommodate changes in the twist of the tape during loading. Therefore, there is no possibility that a difference in tension will occur between the upper and lower edges of the tape between the sub-loading means and the main loading means due to a change in the twist of the tape during loading. Moreover, when the main loading means is moved forward to the forward position and loading is completed, the tension detection means is brought into contact with the tape almost at the same time, so that the tape is not forcibly twisted by the tension detection means during loading. Also, there is no possibility that the tape bus state will be unexpectedly changed from the normal state.

G. Embodiment Hereinafter, an embodiment of a tape loading device in which the present invention is applied to a cassette type video tape recorder will be described with reference to the drawings.

G. First, an overview of the entire tape loading device will be explained with reference to FIGS. 2 and 3.

First, a tape (magnetic tape) 4 wound around a pair of left and right reels 2.3 is housed in a cassette 1 installed in a cassette installation position, and this tape 4 is indicated by a dashed line in FIG. As shown, it is passed horizontally along the front surface of an opening 5 provided at the left and right center portions of the front side of the cassette l. A rotary head drum 6 is arranged in a predetermined inclined state in front of the mounted cassette l. Further, a pair of vertical sub-loading means 7.8 on the left and right are pulled out to the return position in the opening 5 of the cassette l-1 shown by a dashed line in FIG. Arrows a, a', and b while remaining vertical between the forward movement position
'It is provided so that it can freely reciprocate horizontally in the force direction. In addition, a pair of vertical main loading means 9, 10 on the left and right sides are pulled out to the return position in the opening 5 of the cassette 1 shown by the dashed line in FIG. arrows c, c' and d.

It is provided so as to be able to reciprocate in the d' direction. As shown in FIG. 3, the main loading means 1 on the tape winding side
0 is moved horizontally in the directions of arrows d and d' while remaining vertical, while the main loading means 9 on the tape supply side is gradually tilted from the vertical state as it is moved forward in the direction of arrow C. The main loading means 9 is in an inclined state parallel to the rotary head drum 6 in the forward movement position. In the forward movement position, a vertical step H is formed in both the main loading means 9 and 10. Further, the tension detection means 11 of the tape 4 is connected to the sub-loading means 7 and the main loading means 9 on the tape supply side.
The tension detecting means 11 is arranged between each forward movement position of the tape 4 as shown by one point MvA in FIG.
The tape 4 is configured to be movable in the directions of arrows e and e' between a non-operating position where it is not in contact with the tape 4 and an operating position where it is in contact with the tape 4 as shown by the solid line. The sub-loading means 7 on the tape supply side has a rotatable roller guide 14 vertically attached to the top of a slider 13, and the slider 13 is a wire wound between a drive pulley 15 and a guide pulley 16. 17 and is configured to slide horizontally on a guide rail 18 along a guide groove 19 in the directions of arrows a and a'. Further, the sub-loading means 8 on the tape winding side has a rotatable roller guide 23 vertically attached to the upper part of the tip of a rotary arm 22 which is configured to be rotatable about a fulcrum shaft 21. It is configured to be rotated horizontally by the rotation arm 22 in the force direction indicated by the arrows I and b'. Both main loading means 9.10 have a fixed bin guide 27.28 and a rotatable roller guide 29.30 mounted vertically and symmetrically on the upper part of a pair of sliders 25.26. The sliders 25 and 26 are driven via a link mechanism (not shown) by a pair of upper and lower ring gears 31 and 32 that are driven to rotate in opposite directions on the outer circumference of the rotary head drum 6, and are mounted on a pair of guide rails 33 and 34. It is configured to be slid along the guide grooves 35, 36 in the directions of arrows c, c', d, and d'. Further, the tension detection means 11 has a tension bin 38 vertically attached to the upper part of the tip of the tension arm 37.
The tension arm 37 is rotated in the directions of arrows e and e' about a rotation shaft 39 disposed at a predetermined inclination, and the tension pin 38 is attached to the tape 4 in the fully loaded state shown by the solid line in FIG. It is configured to be in contact with the tape center at right angles. In addition, on the tape running path in the state where the tape loading is completed, which is shown by the solid line in FIG. Head 45, bin guide 46
, a capstan 47, and a roller guide 48 are fixedly arranged in this order. The roller guide 41.4B, the bin guide 46, and the capstan 47 are vertical, and the roller guide 42 is inclined parallel to the rotating shaft 39.

Next, the loading operation of the tape 4 will be explained.

First, both sub-loading means 7 and 8 are moved forward in the directions of arrows a and b from the backward movement position to the forward movement position while remaining vertically, and the tape 4 is pulled out horizontally to the left and right sides of the front of the cassette 1. Then, the tape 4 is sub-loaded to a position just before it contacts the rotary head drum 6, as shown by the two-dot chain line in FIG.

By this sub-loading, the tape 4 is brought into contact with both roller guides 41 and 48 which are fixedly arranged, but no twist is given to the tape 4 at all. Further, the pinch roller 49 is pulled out to the front of the capstan 47 together with the sub-loading means 8 on the tape winding side.

Next, both the main loading means 9 and 10 are moved forward from the backward movement position to the forward movement position in the directions of arrows c and d, and the tape 4 is further drawn out to both left and right sides of the rotary head drum 6. As shown in solid lines in FIG. 2 and as shown in FIG. 3, a roller guide 42 is wound around the circumferential surface of the rotary head drum 6 in a substantially Ω shape in a helical state, and the tape 4 is fixedly arranged on the roller guide 42, each head 43, 44, 45, the main loading is carried out on the main loading path in contact with the bin guide 46 and the capstan 47.

By the way, during the above-mentioned main loading, the main loading means 10 on the tape winding side contacts the tape 4 at the position shown by the two-dot chain line in FIG. 2, and then remains vertical until it reaches the forward movement position shown by the solid line in FIG. While the main loading means 9 on the tape supply side contacts the tape 4 vertically at the position shown by the two-dot chain line in FIG. It is lowered in the direction of arrow C while being gradually tilted from the vertical state to the forward movement position shown by. Therefore, the supply side of the tape 4, which is gradually wound spirally around the circumferential surface of the rotary head drum 6, has a downward inclination angle (descending angle) as the main loading means 9 descends in the direction of arrow C. The tape 4 is gradually twisted (the twist of the tape 4 gradually becomes larger), and when the main loading means 9 reaches the forward movement position as shown in FIG. Between the means 9 and the sub-loading means 7, the tape 4 is twisted with an upward inclination angle (rising angle).

Therefore, in this tape loading device, the sub-loading means 7 on the tape supply side is caused to follow the inclination of the main loading means 9 on the tape supply side at the forward movement position indicated by the solid line in FIG. 2 by the inclination control mechanism 51 described later. It is configured to gradually tilt in the direction of arrow f from a vertical state.

Further, in this tape loading device, the tension detecting means 11 is controlled by a position control mechanism 94, which will be described later, until the loading of the tape 4 described above is completed.
The tensile ramp pin 38 is moved to the non-operating position shown by the dashed line in the figure, and then moved in the direction of arrow e to the operating position shown by the solid line in FIG. is configured so as to be brought into contact with the tape 4.

In addition, after the loading of the tape 4 mentioned above is completed, recording,
When the mode is switched to the playback mode, the tape 4 is pressed against the capstan 47 by the pinch roller 49, and the tape 4 is pressed against the capstan 47.
is supplied from the supply reel 2 of the cassette 1 on the main loading path shown by the solid line in FIG. is scanned by a rotary head (not shown) to perform desired recording and reproduction.

Further, the unloading of the tape 4 is performed by the reverse operation of the above-described loading operation, and after the tension detection means 11 is returned to the non-operating position in the direction of the arrow e', the loading means 4 is moved back to the non-operating position. , 8.9°lO moves to the return position with arrow a',
', c', and d', and the tape 4 is rewound onto one of the reels 2 and 3 of the cassette 1.

G2 Next, details of the tilt control mechanism 51 at the forward movement position of the sub-loading means 7 will be explained with reference to FIGS. 1 and 4 to 6.

First, the slider 13 is slid along the guide groove 19 of the guide rail 18 by a pair of front and rear guide pins 52 and 53 attached to its lower part. A slide plate 54 is installed between the guide pins 52 and 53 at the lower part of the guide rail 18, and a compressor is inserted between the slide plate 54 and a spring receiver 55 fitted to the lower end of one of the guide pins 52. The slider 13 is slid onto the guide rail 18 while being lightly pressed by the spring force of the coil spring 56.

Next, at the forward movement position, a fixed block 57 and a movable block 59 rotatably attached to the fixed block 57 via a horizontal fulcrum shaft 58 are provided. The movable block 59 has a substantially L-shaped cross section, and the upper end side of the vertical wall portion 60 is pivoted on the fulcrum shaft 58, and the horizontal wall portion 60 is pivoted on the fulcrum shaft 58.
1 is provided with a guide groove 62 connected to the guide groove 19 of the guide rail 18. Note that the movable block 59 is urged to rotate about the fulcrum shaft 58 in the direction of the arrow f' in FIG. The other side surface 60b of the vertical wall portion 60 is brought into contact with the stopper block 64, so that the movable block 59 is held in a vertical state as shown by the dashed line in FIG. The stopper block 64 has a vertical wall portion 6.
A pressing pin 66 that presses the other side surface 60b of 0 at right angles.
is attached so as to be movable in the horizontal direction, and the vertical wall part 6
A stopper screw 68 attached to a stopper block 67 is provided on one side 60a of the 0.

Next, a cam mechanism 71 for driving the pressing pin 66 is provided next to the pressing pin 66 . The cam mechanism 71 includes a cam 74 on a cam gear 73 rotatably supported by a support shaft 72, and a cam follower rod 75. One end 75a of the cam follower rod 75 is bent into a substantially L shape, and is engaged with the other end 66b of the pressing pin 66, which is opposite to the tip 66a, through a through hole 76, and the other end 75b is supported by an elongated hole 77. Upper end 72a of shaft 72
is engaged with. Further, one end 75a of the cam follower rod 75 is pressed against one spring receiver 79 by a compression coil spring 80 interposed between a pair of spring receivers 78 and 79 fitted to the other end 66b of the pressing pin 66 at a distance. Due to the spring force of the compression coil spring 80, the tip 66a of the pressing pin 66 is elastically pressed against the side surface 60a of the movable block 59 from the direction of arrow g in FIG. A rotatably pivoted roller 81 connects to a cam 74.
is elastically pressed against the circumferential surface in the direction of arrow g' in FIG.

Next, the cam mechanism 71 is interlocked with a gear drive mechanism 83 that drives a pair of upper and lower ring gears 31 and 32 to rotate in opposite directions for reciprocating both the main loading means 9 and 10 mentioned above. This gear drive mechanism 83 drives a worm wheel 8 by a worm 85 driven by a motor 84.
The drive gear 87 of one ring gear 31 is driven through the worm wheel 86, and the intermediate gear 88 is driven by the worm wheel 86.
The drive gear 89 of the other ring gear 32 is configured to be driven in reverse rotation through the drive gear 89 of the other ring gear 32. For example, an intermediate gear 88 is interlocked with the cam gear 73 via an interlocking gear 90.

Next, the operation of the tilt control mechanism 51 configured as above will be explained.

First, during the sub-loading described above, the sub-loading means 7 is pulled by the wire 17 to move forward from the backward movement position to the forward movement position, but when the sub-loading means 7 is moved forward to the forward movement position, the slider 13 As shown in FIGS. 1 and 4, the movable block 59 is completely transferred from the guide rail 18 onto the horizontal wall 61 of the movable block 59 and stopped.

At this point, the movable block 59 is held in a vertical position as shown by the dashed line in FIG. 5, so the roller guide 14 of the sub-loading means 7 remains in the vertical position. Further, the slider 13 is positioned on the horizontal wall portion 61 by a positioning mechanism (not shown) so that there is no wobbling.

Next, during the above-described main loading, the motor 84 of the gear drive mechanism 83 drives both ring gears 31 and 32 in opposite directions through both drive gears 87 and 89, thereby causing both main loading means 9 and 10 to move backward. During main loading, the cam gear 73 of the cam mechanism 71, which is interlocked with the gear drive mechanism 83 via the interlocking gear 90, rotates less than one revolution in the direction of the arrow in FIG. approximately 300”) rotationally driven.

During this main loading, the main loading means 9 comes into contact with the sub-loaded tape 4 as shown by the dashed-dotted line in FIG. 1 in a vertical state as shown by the dashed-dotted line in FIG. Gradually tilts and descends in the direction of arrow C to the forward movement position shown by the solid line in the figure (forward movement)
During this time, as shown in FIG. 5, the cam 74 on the cam gear 73 gradually pushes the roller 81 of the cam driven rod 75 in the direction of arrow g. The cam driven rod 75 is a compression coil spring 8.
0 in the direction of arrow g, and the tip 66a of the press pin 66 touches the side surface 60 of the movable block 59.
In order to press b in the direction of the arrow g, the movable block 59 is rotated in the direction of the arrow f about the fulcrum shaft 58 against the leaf spring 63. As a result, the roller guide 1 of the sub-loading means 7 riding on the horizontal wall 61 of the movable block 59
4 is gradually inclined in the direction of arrow f in FIGS. 1 and 5, following the inclination of the main loading means 9, from the vertical state shown by the dashed line in FIG. It should be noted that at approximately the same time that the main loading means 9 is moved forward to the forward movement position indicated by the solid line in FIG.
is in the tilted state shown by the solid line in FIG.

In short, the sub-loading means 7 is caused to follow the inclination of the main loading means 9 in the forward movement position, and is gradually tilted in the direction of the arrow f from the vertical position, and the main loading means 9 causes the tape 4 to move around the rotating head drum 6. adapted to the change in twist gradually imparted to the tape 4 as it is gradually wound spirally around the surface,
The sub-loading means 7 is gradually tilted in the direction of arrow f from the vertical state. As shown by the solid line in FIG. 1 (see FIG. 3), when the main loading means 9 reaches the forward movement position, the sub-loading means 7 is in an inclined state parallel to the main loading means 9.

As a result of the above, even though the twist of the tape 4 gradually changes with the main loading, there is no tension difference between the upper and lower edges of the tape 4 between the sub-loading means 7 and the main loading means 9, and the tape 4 can be main loaded.

In this tilt control mechanism 51, as shown in FIGS. 5 and 6, the rotation center 0 of the movable block 59 (the center of the fulcrum shaft 58) is set on the supply side of the tape 4 with respect to the circumferential surface of the roller guide 14. Since the roller guide 14 is placed on the contact point P and at the tape center position of the tape 4 (center position between the top and bottom of the tape), even if the roller guide 14 is tilted in the direction of the arrow f, the amount of deviation H in the height of the tape 14 is minimized. I was able to make it smaller. Therefore, the pair of roller guides 14 and 4 shown in FIG.
The height deviation of the tape 4 that is passed horizontally between the roller guide 14 and the roller guide 14 can be made extremely small. can.

03 Next, details of the position control mechanism 946 of the tension detection means 11 will be explained with reference to FIGS. 1 and 7. □ First, the rotating shaft 39 of the tension arm 37, which is provided in an inclined state as described above, is rotatably supported in the support member 95, and the lower end of the rotating shaft 39 is attached to the lower end of the rotating shaft 39. A tension detector 96 is attached to electrically detect the tension. The tension arm 37 is urged to rotate in the direction of arrow e in FIG. 1 by a tension spring 97 made of a tension coil spring. The tension pin 38 is vertically attached to the upper part of the tip 37a of the tension arm 37 as described above, and a pin 98 is also attached to the lower part of the other end 37b. A control lever 99 is disposed straddling the lower part of the other end 37a of the tension arm 37 and the lower part of the cam gear 73 of the cam mechanism 71. This control lever 99 is configured to be rotatable around a fulcrum shaft 100 in the directions of arrows i and i' in FIG.
It is rotated and biased in the ' direction. Further, a control pin 102 is attached to the lower part of the cam gear 73.

Next, the operation of the position control mechanism 94 configured as above will be explained.

First, as described above, in the state before loading is started when the main loading means 9 is returned to the return position, it is rotated in the direction of the arrow i' by the control spring 101, as shown by the dashed line in FIG. One end 99 a of the control lever 99
is in contact with the pin 98 of the tension arm 37, and the tension arm 37 is rotated in the direction of arrow e'. Therefore, in this state, the tension pin 38 of the tension detection means 11 has been moved to a non-operating position where it does not come into contact with the tape 4. .

Next, as described above, while the main loading means 9 is moved forward in the direction of arrow C to the forward movement position shown by the solid line in FIG. 1 and the main loading is completed, The control pin 102 of the rotationally driven cam gear 73 is rotated from the position indicated by the dashed line to the position indicated by the dotted line in FIG. Almost at the same time as the main loading is completed, the control pin 10 is
2 comes into contact with the other end 99b of the control lever 99 to rotate the control lever 99 in the direction of arrow i against the control spring 101. Then, one end 99a of the control lever 99 is separated from the pin 98 of the tension arm 37, the tension arm 37 is rotated in the direction of arrow e by the tension spring 97, and the tension pin 3 of the tension detection means 11 is rotated.
8 is brought into an operating position in which it is brought into contact with the tape 4, which is passed on the inclined rod between the sub-loading means 7 and the main loading means 9 (see FIG. 3), in a state perpendicular to its tape center, as described above. will be moved.

Note that the tension detection pin 3 has been moved to this operating position.
Reference numeral 8 is pressed against the tape 4 by the spring force of a tension spring 97, and oscillates in the directions of arrows e and e' in FIG. move. Then, the tension on the tape supply side of the tape 4 is detected by a tension detector 96 that detects the rotation angle of the rotating shaft 39 that rotates in unison with the swinging motion, and in order to stabilize the tension at a constant state, the tension is detected from the cassette 1. The back tension of the supplied tape 4 is automatically controlled.

In short, the tension detecting means 11 is not brought into contact with the tape 4 during loading of the tape 4, and almost at the same time as the loading is completed, the tension detecting means 11 is connected to the tape between the sub loading means 7 and the main loading means 9. 4.

As a result of the above, since the tape 4 came into contact with the tension pin 38 of the tension detection means 11 during loading, the sub-loading means 7 and the main loading means 9
If the tape 4 between the tape 4 is forcibly twisted by the tension pin 38, or the path state of the tape 4 unexpectedly changes from the normal state shown by the solid line in Fig. 1, the tape 4 may be fixed to the tension pin 38 or its vicinity. The upper and lower edges of the tape 4 are not damaged by the upper and lower flanges 42a of the disposed roller guide 42, etc.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the present invention.

Furthermore, the present invention is not limited to tape loading devices for cassette video tape recorders, but can be applied to tape loading devices for various cassette recording and reproducing devices and information processing devices.

H Effects of the Invention The present invention prevents a tension difference between the upper and lower edges of the tape between the sub-loading means and the main loading means due to a change in the twist of the tape during loading, and also prevents the tape from being loaded by the tension detection means. Since the tape is prevented from being forcibly twisted during the process or the path state of the tape is not unexpectedly changed from its normal state, it is possible to load the tape extremely safely without damaging the tape.

In particular, the sub-loading means itself has a structure that also serves as a tape twist absorbing guide, and there is no need to arrange multiple guides between the sub-loading guide and the main loading guide to absorb tape twists. The structure is extremely simple.

Further, as shown in the embodiment, the sub-loading guide is moved horizontally to the forward position while remaining vertical, and after sub-loading the tape to a position just before it contacts the rotating head drum, the main loading means Main loading is performed to wind the tape around the rotating head drum, and in conjunction with the main loading operation, the sub-loading means is configured to follow the inclination of the main loading means at the forward movement position and gradually tilt from a vertical state. This facilitates the design and implementation of tilt control of the sub-loading means adapted to changes in the twist of the tape.

Further, as shown in the embodiment, when the main loading means is moved forward to the forward position, the tension detecting means is moved to the operating position where it is brought into contact with the tape. It is easy to time the movement of the detection means to the operating position, and reliability is increased.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a tape loading device for a cassette-type video tape recorder, in which FIG. 1 is a plan view of the main part, FIG. 2 is a plan view of the whole, and FIG. 3 is a plan view of the main part. is a tape loading path diagram, FIG. 4 is a sectional view of the tilt control mechanism, FIG. 5 is a view taken along arrows v-vwA in FIG.
FIG. 6 is a partially enlarged view, and FIG. 7 is a developed view of the position control mechanism. In addition, in the symbols used in the drawings, 1--
−・−・−・−・−・・−・・Tape 6−・−・・−
・−・−・Rotating head drum 7.8・−−−−−1・
・−・Subloading means 9.10・−・−・・・−
...Main loading means 11--...
−・−・・−・Tension detection means 5 t---1−
・−−−−−−−−−−−1・Tilt control mechanism 94・・−
...--1-----Position control mechanism.

Claims (1)

[Scope of Claims] A rotary head drum disposed in front of the mounted cassette, and a left and right drum that can freely reciprocate between a backward movement position within the cassette and a forward movement position pulled out to the front left and right sides of the cassette. a pair of sub-loading means, a pair of left and right main loading means that can freely reciprocate between a backward movement position in the cassette and a forward movement position pulled out to the left and right sides of the rotary head drum, and a tape tension detection means. The tape in the cassette is pulled out to the front left and right sides of the cassette by both the sub-loading means, and is wound around the circumferential surface of the rotary head drum in a helical state in a substantially Ω-shape by both the main loading means, and In the tape loading device, the pulled out tape is also brought into contact with the tension detecting means, wherein when the main loading means gradually wraps the tape around the circumferential surface of the rotary head drum in a spiral manner, A tilt control mechanism is provided to gradually tilt the at least one sub-loading means from a vertical position in response to changes in the applied twist, and the main loading means is moved forward from the backward movement position to the forward movement position. Until then, the tension detection means was moved to a non-operating position where it did not come into contact with the tape, and the tension detection means was brought into contact with the tape almost at the same time as the main loading means finished being moved to the forward movement position. A tape loading device characterized by being provided with a position control mechanism for moving the tape to an operating position.