JPH0610909B2 - Tape Producing Equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial field of use B Outline of the invention C Conventional technology D Problems to be solved by the invention E Means for solving problems F Action G Example G ₁ Outline description of the entire tape loading device (Fig. 2) And FIG. 3) Description of the tilt control mechanism of the G ₂ sub-loading means (first
FIGS. 4 to 6) Description of the position control mechanism of the G ₃ tension detecting means (FIGS. 1 and 7) H Effect of the invention A Industrial field of application The present invention is, for example, a cassette type video tape recorder. The present invention relates to a tape loading device most suitable for use in, in which a tape drawn out from a mounted cassette is wound around the peripheral surface of a rotary head drum in a substantially Ω shape in a spiral state.

B Outline of the Invention According to the present invention, the tape in the mounted cassette is pulled out to the front left and right both sides of the cassette and arranged in front of the cassette by using a pair of left and right sub-loading means and a pair of left and right main loading means. In a tape loading device such as a cassette type video tape recorder, which is wound around about Ω in a spiral state around the rotary head drum in a spiral state, and the drawn tape is also brought into contact with the tension detecting means, the main loading means is used. To gradually incline the at least one sub-loading means from a vertical state to accommodate changes in the gradual twist imparted to the tape as the tape is gradually wound spirally around the peripheral surface of the rotary head drum. And whether the main loading means is in the return position. The tension detecting means is moved to a non-operating position where the tape does not come into contact with the tape until it is moved to the returning position, and the main loading means is moved to the moving position almost at the same time. By moving the tension detecting means to the operating position in contact with the tape, the tape can be loaded extremely safely without damaging it.

C Conventional Technology Conventionally, in a tape loading device such as a cassette type video tape recorder, a rotary head drum disposed in front of a mounted cassette, a return position in the cassette, and a front left and right side portions of the cassette are pulled out. A pair of left and right sub-loading means that can reciprocate between the reciprocating left and right positions, and a left and right reciprocating left and right reciprocating position between the backward moving position in the cassette and the forward moving positions that are pulled out to the left and right sides of the rotary head drum A pair of main loading means and a tape tension detecting means are provided, and the tape in the cassette is pulled out to both the front left and right sides of the cassette by the both sub loading means and the circumference of the rotary head drum is provided by the both main loading means. The surface of the tape is wound in an approximately Ω shape in a spiral state, and the drawn tape is also contacted with the tension detecting means. There are things I tried to touch.

D. Problems to be Solved by the Invention This type of tape loading device is provided with a twist (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. ) Should not be transmitted to the cassette, the sub-loading means should be inclined at a predetermined inclination with respect to the main loading means at the forward movement position.

However, in most of the conventional tape loading devices of this type, most of them simply move the sub-loading means designed to have an inclination in the loading completion state from the backward movement position to the forward movement position. Therefore, conventionally, the change in the twist of the tape during loading (the twist of the tape gradually increases as the tape is gradually wound around the peripheral surface of the rotary head drum in a spiral shape, and when the tape is loaded, the tape twists. Twist is the maximum.) As for the inclination and height change of the sub-loading means, it has not been sufficiently designed.

As a result, conventionally, due to a change in the twist of the tape during loading, a tension difference is apt 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 are easily stretched into wakame-like damage. It was easy to receive.

Further, in most of the conventional tape loading devices of this type, most of the devices are in contact with the tension detecting means during loading. However, since the tension detecting means is designed to make contact with the tape at a predetermined inclination (a state perpendicular to the tape center) when the loading is completed, the tape contacts the tension detecting means during loading. Then, the tape may be forcibly twisted or the pass state of the tape may be unexpectedly changed from the normal state.

As a result, conventionally, the tension detecting means forcibly twists the tape during loading, or the tape pass state is unexpectedly changed from the normal state, so that the tape guide arranged in the tension detecting means or in the vicinity thereof. After all, it was easy to damage the tape by the upper and lower flanges.

Particularly in recent years, since the tape material tends to be very thin for the purpose of long-time recording, the tape is more likely to be damaged. Even with this type of conventional tape loading device, tape damage during loading can be reduced by greatly reducing the tape tension during loading.
If the tape tension is lowered to a large extent, the tape is slackened or runaway during loading, and the tape easily falls off from the guides and cannot be loaded. Therefore, there is a limit to lowering the tape tension.

The present invention prevents the tension difference between the upper and lower edges of the tape between the sub-loading means and the main loading means due to the change of the twist of the tape during the loading, and the tension detecting means prevents the tape from being loaded during the loading. This is to prevent the tape from being twisted by force and the tape pass state from being changed from the normal state to the unexpected state.

E Means for Solving Problems The present invention provides a tape loading device as described above,
The at least one side (for example, the tape supply side) is adapted to the change in the twist gradually given to the tape when the tape is gradually wound around the peripheral surface of the rotary head drum by the main loading means.
Is provided with an inclination control mechanism for gradually inclining the sub-loading means from the vertical state, and the tension detecting means is not brought into contact with the tape until the main loading means is moved from the backward movement position to the forward movement position. A position control mechanism is provided for moving the tension detecting means to the operating position which is in contact with the tape substantially at the same time when the main loading means is moved to the forward moving position and is moved to the forward moving position. is there.

F action The present invention gradually tilts the sub-loading means from the vertical state in order to adapt to the change in the twist of the tape which is gradually given by being gradually wound in a spiral shape on the peripheral surface of the rotary head drum. The inclination of the means will adapt to changes in the twist of the tape during loading. Therefore, a change in the twist of the tape during loading does not cause a difference in tension between the upper and lower edges of the tape between the sub loading means and the main loading means. Moreover, when the main loading means is moved to the forward movement position and the loading is completed, the tension detecting means is brought into contact with the tape almost at the same time, so that the tension detecting means forcibly twists the tape during loading. Nor does the tape pass state change unexpectedly from the normal state.

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

G ₁ First, the outline of the entire tape loading device will be described with reference to FIGS. 2 and 3.

First, a tape (magnetic tape) 4 wound around a pair of left and right reels 2 and 3 is housed in a cassette 1 mounted at a cassette mounting position. This tape 4 is indicated by a chain line in FIG. As shown, the cassette 1 is horizontally passed along the front surface of the opening 5 provided at the center of the front side of the cassette 1. The rotary head drum 6 is disposed in front of the mounted cassette 1 in a predetermined inclined state. A pair of vertical left and right sub-loading means 7 and 8 are drawn out to the backward movement position in the opening 5 of the cassette 1 indicated by the one-dot chain line in FIG. 2 and to the front left and right sides of the cassette 1 indicated by the solid line. The arrows a, a ′ and b, b ′ remain vertical with respect to the moving position.
It is installed so that it can reciprocate horizontally in any direction. Further, a pair of left and right main loading means 9 and 10 in a vertical shape are drawn out to the backward movement position in the opening 5 of the cassette 1 shown by a chain line in FIG. 2 and both left and right sides of the rotary head drum 6 shown by a solid line. It is reciprocally movable in the directions of arrows c, c'and d, d'with respect to the forward movement position. As shown in FIG.
The main loading means 10 on the tape winding side is horizontally moved forward in the directions of arrows d and d'while keeping the vertical state, whereas the main loading means 9 on the tape supply side is moved forward in the direction of arrow c. Accordingly, the main loading means 9 is gradually lowered from the vertical state while being lowered.
Becomes an inclined state parallel to the rotary head drum 6 at the forward movement position. In the forward movement position, both main loading means 9,
Upper and lower steps H are formed at 10. The tension detecting means 11 for the tape 4 is arranged between the sub-loading means 7 and the main loading means 9 on the tape supply side, and the tension detecting means 11 is provided.
Is configured to be movable in the directions of arrows e and e'between the non-operating position where it is not in contact with the tape 4 as shown by the one-dot chain line in FIG. 2 and the 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 mounted vertically on a slider 13, and the slider 13 has a wire wound between a drive pulley 15 and a guide pulley 16. It is configured to be driven by 17 and slide horizontally on the guide rail 18 along the 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 an upper portion of a tip end of a rotating arm 22 configured to be rotatable around a fulcrum shaft 21. The rotation arm 22 is configured to horizontally rotate in the directions of arrows b and b '. Both main loading means 9 and 10 have pin guides 27 and 28 fixed on a pair of sliders 25 and 26 and a rotatable roller guide 29, respectively.
And 30 are vertically mounted symmetrically with each other, and both sliders 25 and 26 are 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.
Is driven by a link mechanism (not shown) by a pair of guide rails 33, 34 to form a pair of guide grooves 35,
It is constructed so as to be slid along 36 in the directions of arrows c, c'and d, d '. The tension detecting means 11 has a tension pin 38 vertically attached to the upper end of the tension arm 37, and the tension arm 37 has arrows e, e ′ around a rotary shaft 39 arranged in a predetermined inclined state. The tension pin 38
2 is contacted with the tape 4 in the loading completed state shown by the solid line in FIG. 2 at a right angle to the tape center. Further, on the tape running path in the tape loading completion state shown by the solid line in FIG. 2, roller guides 41, 4 are provided from the tape supply side to the winding side.
2. A full width disappearing head 43, a voice canceling head 44, a voice recording / playback CTL head 45, a pin guide 46, a capstan 47, and a roller guide 48 are sequentially fixedly arranged.
The roller guides 41 and 48, the pin guide 46, and the capstan 47 are vertical, and the roller guide 42 is inclined parallel to the rotary shaft 39.

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

First, both sub-loading means 7 and 8 are moved forward in the directions of arrows a and b in the vertical state from the backward movement position to the forward movement position, and the tape 4 is horizontally drawn out to both front left and right side portions of the cassette 1. , The tape 4 is subloaded to a position before it comes into contact with the rotary head drum 6 as shown by the chain double-dashed line in FIG.

By this sub-loading, the tape 4 is brought into contact with the fixed roller guides 41 and 48, but no twist is given. 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, the both main loading means 9 and 10 are moved forward in the directions of arrows c and d from the backward movement position to the forward movement position, and the tape 4 is moved.
Is further pulled out to both left and right sides of the rotary head drum 6,
The tape 4 is spirally wound around the peripheral surface of the rotary head drum 6 in a substantially Ω shape as shown in the solid line in FIG. 2 and in FIG. 3, and the tape guide 4 is fixedly arranged.
2, the heads 43, 44 and 45, the pin guide 46 and the capstan 47 are in contact with the main loading path and are main loaded.

By the way, at the time of the 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 the forward movement position shown by the solid line in FIG. While it is moved horizontally in the direction of arrow d, the main loading means 9 on the tape supply side contacts the tape 4 in the vertical state at the position shown by the chain double-dashed line in FIG. 2 and then in the solid line in FIG. The vehicle is gradually tilted from the vertical state to the forward movement position shown by and is lowered in the direction of arrow c. Therefore, the supply side of the tape 4 which is gradually wound in a spiral shape on the peripheral surface of the rotary head drum 6 has a downward inclination angle (falling 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 is gradually increased), and when the main loading means 9 reaches the forward movement position as shown in FIG. The tape 4 is twisted with an upward inclination angle (elevation angle) between the sub-loading means 7 and the sub-loading means 7.

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

In this tape loading device, the tension detecting means 11 is moved to the second position until the above-mentioned loading of the tape 4 is completed by the position control mechanism 94 described later.
The tape is moved to the non-operating position shown by the one-dot chain line in the figure, and almost at the same time when the loading of the tape 4 is completed, it is moved to the operating position shown by the solid line in FIG. 38 is configured to contact the tape 4.

Note that recording is performed after the above-described loading of the tape 4 is completed,
When switched to the reproduction mode, the tape 4 is pressed against the capstan 47 by the pinch roller 49,
Is rotated at a high speed while being driven at a high speed while being supplied from the supply reel 2 of the cassette 1 and wound on the take-up reel 3 on the main loading path shown by the solid line in FIG. Scanning is performed by a 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-mentioned loading operation, and after the tension detecting means 11 is returned to the non-operating position in the direction of the arrow e ', the four loading means 7, 8, 9, 10 is the arrow a'to the return position,
The tape 4 is moved back in the b ', c', and d'directions, respectively, and the tape 4 is rewound onto either one of the reels 2 and 3 of the cassette 1.

G ₂ Next, the details of the tilt control mechanism 51 at the forward movement position of the sub-loading means 7 will be described 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 the lower portion thereof. A slide plate 54 is installed under the guide rail 18 between the guide second pins 52 and 53, and a compression is interposed between the spring plate 55 fitted to the lower end of one guide pin 52 and the slide plate 54. The slider 13 is slid on the guide rail 18 while being slightly pressed by the spring force of the coil spring 56.

Next, a fixed block 57 and a movable block 59 rotatably attached to the fixed block 57 via a horizontal fulcrum shaft 58 are provided at the forward movement position. The movable block 59 has a substantially L-shaped cross section, the upper end side of the vertical wall portion 60 is pivotally supported by the fulcrum shaft 58, and the horizontal wall portion 61 has a guide groove 62 connected to the guide groove 19 of the guide rail 18. It is provided. The fixed block 57
The movable block 59 is fixed to the fulcrum shaft 58 by the leaf spring 63 which is fixed to the one side surface 60a of the vertical wall portion 60.
5 is rotated and biased in the direction of arrow f'in FIG. 5, and the other side surface 60b of the vertical wall portion 60 is brought into contact with the stopper block 64 to move the movable block 59 to the position shown in FIG.
As shown by the dashed line, it is configured to be held in a vertical state. The stopper pin 64 presses the other side surface 60b of the vertical wall portion 60 at a right angle to the stopper block 64.
6 is attached movably in the horizontal direction, and a stopper block 67 is provided on one side 60a side of the vertical wall portion 60.
There is a stopper screw 68 attached to the.

Next, a cam mechanism 71 for driving the pressing pin 66 is provided at the lateral position of the pressing pin 66. The cam mechanism 71 is composed of a cam 74 on a cam gear 73 that is rotatably supported by a support shaft 72, and a cam driven rod 75. One end 75a of the cam driven rod 75 is bent into a substantially L shape and is engaged with the other end 66b of the pressing pin 66 opposite to the tip end 66a by a through hole 76.
The other end 75b is engaged with the upper end 72a of the support shaft 72 by the long hole 77. Further, one end 75a of the cam driven 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 roller 81 pivotally attached to the lower part of the roller 5 is elastically pressed against the peripheral surface of the cam 74 in the direction of arrow g'in FIG.

Next, the cam mechanism 71 is interlocked with the gear drive mechanism 83 that drives the pair of upper and lower ring gears 31 and 32 for reciprocating the main loading means 9 and 10 described above in reverse rotation. The gear drive mechanism 83 is driven by a worm 85 driven by a motor 84.
The drive gear 87 of one ring gear 31 is driven via 6 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 to rotate in the reverse direction. Then, for example, the intermediate gear 88 is interlocked with the cam gear 73 via the interlocking gear 90.

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

First, at the time of the sub-loading described above, the wire 17 pulls the sub-loading means 7 to move it from the returning position to the reciprocating position. When the sub-loading means 7 is moved to the moving position, the slider 13 is moved forward. As shown in FIG. 1 and FIG. 4, it is completely transferred from the guide rail 18 onto the horizontal wall portion 61 of the movable block 59 and stopped. At this point, the movable block 59 is held in the vertical state as shown by the one-dot chain line in FIG.
The roller guide 14 of the sub-loading means 7 remains vertical. Further, the slider 13 is positioned on the horizontal wall portion 61 by a positioning mechanism (not shown) so that there is no backlash.

Next, at the time of the above-mentioned main loading, the motor 84 of the gear drive mechanism 83 drives both ring gears 31 and 32 to rotate in opposite directions via both drive gears 87 and 89, thereby moving both main loading means 9 and 10 back. The cam gear 73 of the cam mechanism 71, which moves forward from the position to the reciprocating position, is interlocked with the gear drive mechanism 83 via the interlocking gear 90 at the time of this main loading.
It is driven to rotate less than once (eg, about 300 °) in the direction.

At the time of this main loading, the main loading means 9 comes into contact with the tape 4 which is sub-loaded as shown by the two-dot chain line in FIG. 1 in a vertical state as shown by the one-dot chain line in FIG. While descending in the direction of arrow c while gradually inclining to the forward movement position shown by the solid line in the figure (forward movement)
In the meantime, 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 as shown in FIG. And the cam driven rod 75 is the compression coil spring 8
0 presses the pressing pin 66 in the direction of arrow g, and the tip 66a of the pressing pin 66 is attached to the side surface 60 of the movable block 59.
Since b is pressed in the direction of arrow g, the movable block 59 is rotated about the fulcrum shaft 58 in the direction of arrow f against the leaf spring 63. As a result, the roller guide 1 of the sub-loading means 7 mounted on the horizontal wall portion 61 of the movable block 59.
4 is gradually tilted in the direction of arrow f in FIGS. 1 and 5 which follows the tilt of the main loading means 9 from the vertical state shown by the one-dot chain line in FIG. It should be noted that, at the same time as the main loading means 9 is moved to the forward movement position indicated by the solid line in FIG.
5 is in the inclined state shown by the solid line in FIG. 5, the side surface 60a of the movable block 59 is brought into contact with the stopper screw 68 and stopped, and is fixed in the inclined state by the spring force of the compression coil spring 80.

In short, the sub-loading means 7 is made to follow the inclination of the main loading means 9 in the forward movement position and is gradually inclined from the vertical state in the direction of the arrow f. The main loading means 9 causes the tape 4 to move around the rotary head drum 6. Adapted to the change in twist that is gradually given to the tape 4 when it is wound in a spiral shape on the surface,
The sub-loading means 7 is gradually inclined from the vertical state in the direction of arrow f. When the main loading means 9 reaches the forward movement position as shown by the solid line in FIG. 1 (see FIG. 3), the sub loading means 7 is in an inclined state parallel to the main loading means 9.

As a result, although the twist of the tape 4 is gradually changed in accordance with the main loading, the tension difference between the upper and lower edges of the tape 4 is not generated between the sub loading means 7 and the main loading means 9. 4 can be main loaded.

In the tilt control mechanism 51, as shown in FIGS. 5 and 6, the rotation center O (the center of the fulcrum shaft 58) of the movable block 59 is located on the supply side of the tape 4 with respect to the peripheral surface of the roller guide 14. Since it is arranged on the contact point P and at the tape center position of the tape 4 (the center position of the vertical width of the tape), even if the roller guide 14 is tilted in the direction of the arrow f, the deviation amount H ₁ of the height of the tape 14 is extremely small. Could be made smaller. Therefore, the height deviation of the tape 4 which is horizontally passed between the pair of roller guides 14 and 41 shown in FIG.
Damage to the upper and lower edges of the tape 14 due to the upper and lower flanges 14a and the like can be eliminated.

G ₃ Next, the position control mechanism 94 of the tension detecting means 11 will be described in detail 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 supporting member 95, and the tension of the tape 4 is attached to the lower end of the rotating shaft 39 by the rotation angle. A tension detector 96 for electrical detection is attached. The tension arm 37 is urged to rotate in the direction of arrow e in FIG. 1 by a tension spring 97 which is a tension coil spring. The tension pin 38 is vertically attached to the upper end 37a of the tension arm 37 as described above, and the pin 98 is attached to the lower end of the other end 37b. A control lever 99 is arranged across 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. The control lever 99 is configured to be rotatable about a fulcrum shaft 100 in the directions of arrows i and i'in FIG. 1, and is controlled by a control spring 101 composed of a tension coil spring, which is stronger than the tension spring 97, in the direction of arrow i '. It is urged to rotate. A control pin 102 is attached to the lower portion of the cam gear 73.

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

First, in the state before the start of loading, in which the main loading means 9 is returned to the return position as described above, it is rotated in the direction of arrow i'by the control spring 101 as shown by the one-dot chain line in FIG. One end 99a of the control lever 99 is brought into contact with the pin 98 of the tension arm 37, and the tension arm 37 is rotated in the arrow e'direction. Therefore, in this state, the tension pin 38 of the tension detecting means 11 is moved to the non-operating position where it is not in 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 to complete the main loading, in the direction of arrow h in FIG. The control pin 102 of the rotationally driven cam gear 73 is rotated from the position indicated by the one-dot chain line in FIG. 1 to the position indicated by the dotted line. At about the same time that the main loading is completed, the control pin 10 as shown by the solid line in FIG.
2 contacts 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, and the tension arm 37 is rotated in the direction of arrow e by the tension spring 97, so that the tension pin 3 of the tension detecting means 11 is rotated.
As described above, 8 moves to the operating position in which the tape 4 which is obliquely passed between the sub loading means 7 and the main loading means 9 (see FIG. 3) is in contact with the tape 4 at a right angle to the tape center. Be moved.

The tension detection pin 3 moved to this operating position
Reference numeral 8 is pressed against the tape 4 by the spring force of the tension spring 97, and oscillates in the directions of arrows e and e'in FIG. 1 in response to the change in the tension of the tape 4 running at a low speed at the time of recording and reproducing described above. Move. Then, the tension detector 96 that detects the rotation angle of the rotary shaft 39 that rotates together with the swing motion detects the tension on the tape supply side of the tape 4, and the cassette 1 is stabilized in order to stabilize the tension in a constant state. 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 at all during the loading of the tape 4 and the tension detecting means 11 is placed between the sub-loading means 7 and the main loading means 9 almost at the same time when the loading is completed. 4 is to be contacted.

As a result, the tape 4 between the sub-loading means 7 and the main loading means 9 is forcibly twisted by the tension pin 38 because the tape 4 contacts the tension pin 38 of the tension detecting means 11 during loading. 1, the pass state of the tape 4 is unexpectedly changed from the normal state of the solid line in FIG. 1, and the upper and lower sides of the tape 4 are changed by the tension pin 38 and the upper and lower flanges 42a of the roller guide 42 fixedly arranged in the vicinity thereof. The edges are not damaged.

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

Further, the present invention is not limited to the tape loading device of the cassette type video tape recorder, but can be applied to various cassette type recording / reproducing devices and tape loading devices of information processing devices.

H Effect of the Invention The present invention prevents the tension difference between the upper and lower edges of the tape between the sub-loading means and the main loading means due to the change in the twist of the tape during the loading, and the loading of the tension detecting means. Since the tape is prevented from being forcibly twisted on the way and the tape pass state is not unexpectedly changed from the normal state, the tape can be loaded extremely safely without being damaged. And, in particular, the sub-loading means itself has a structure that also serves as a twisting guide for the tape, and there is no need to arrange a large number of guides between the sub-loading guide and the main loading guide in order to absorb the twisting of the tape. The structure is remarkably simple.

Further, as shown in the embodiment, the sub-loading guide is moved horizontally to the forward movement position in the vertical state, and the tape is sub-loaded once to a position before coming into contact with the rotary head drum. Main loading is performed to wind the tape around the rotary head drum, and in conjunction with the main loading operation, the sub loading means is made to follow the inclination of the main loading means in the forward movement position and gradually incline from the vertical state. This facilitates the design and implementation of tilt control of the sub-loading means adapted to changes in tape twist.

Further, as shown in the embodiment, when the tension detecting means is moved to the operating position in contact with the tape in association with the reciprocating movement of the main loading means to the reciprocating position, the completion of loading of the tape and the tension detecting means. It is easy to set the timing with the movement to the operating position, and the reliability is increased.

[Brief description of drawings]

The drawings show an embodiment in which the present invention is applied to a tape loading device of a cassette type video tape recorder. FIG. 1 is a plan view of essential parts, FIG. 2 is a plan view of the whole, and FIG. Is a tape loading path diagram, FIG. 4 is a cross-sectional view of the tilt control mechanism, FIG. 5 is a view taken along the line VV in FIG.
FIG. 6 is a partially enlarged view, and FIG. 7 is a development view of the position control mechanism. In the reference numerals used in the drawings, 1 ... cassette 4 ... tape 6 ... rotating head drum 7,8 ... subloading means 9,10 ... main loading means 11 ... tension detecting means 51 ... inclination control Mechanism 94 …… Position control mechanism

Claims (1)

[Claims] 1. A left and right movable head which is reciprocally movable between a rotary head drum arranged in front of a mounted cassette, a backward movement position in the cassette and a forward movement position pulled out to both 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 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 the sub-loading means, and is wound around the peripheral surface of the rotary head drum in a substantially Ω shape by the main loading means. In the tape loading device in which the pulled-out tape is also brought into contact with the tension detecting means, The step gradually tilts the at least one sub-loading means from the vertical state in response to a change in twist gradually given to the tape when the tape is gradually wound in a spiral shape on the peripheral surface of the rotary head drum. An inclination control mechanism is provided to allow the main loading means to move to a non-operating position where the tension detecting means does not come into contact with the tape until the main loading means is moved from the return position to the forward movement position. A tape loading device comprising a position control mechanism for moving the tension detecting means to an operating position where the tension detecting means is brought into contact with the tape substantially at the same time when the means is completely moved to the forward moving position.