JPS5858739B2 - Tape loading equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape loading device suitable for application to a recording/reproducing device such as a VTR.

In recent tape loading devices for cassette-type VTRs, the tape is pulled out from the cassette by forward rotation of a loading ring and loaded onto a predetermined loading path that is wrapped at a predetermined angle around the circumferential surface of a rotating head drum. The tape is so structured that the loaded tape is unloaded and pulled back into the cassette by the return rotation of the ring.

However, in many conventional devices of this kind, a dedicated DC motor is used to drive the loading ring, and the loading ring is rotated forward and backward by the forward and reverse rotation of this motor.

However, this structure uses an expensive motor dedicated to loading and unloading.
The drawback is that the number of motors is large and the cost is very high.

On the other hand, in devices of this type, the rotation of the rotary head drum during tape unloading causes significant inconveniences.

That is, since the circumferential surface of the rotary head drum is usually mirror-finished, this circumferential surface is very susceptible to condensation due to sudden changes in temperature.

If condensation occurs on the circumferential surface in the stop mode, the loaded tape will easily adhere to (bite into) this circumferential surface.

Note that since unloading of the tape starts from the above-mentioned stop mode, the rotary head drum may be rotated (rotated at high speed) during unloading while the rotary head drum is exposed to condensation as described above. Not only is the tape not able to be unloaded, but the tape is pulled out from the cassette at high speed because the drum is rotated while the tape is in close contact with the circumferential surface of the rotating head drum. This can lead to truly inconvenient accidents such as the tape breaking or getting tangled.

The present invention was invented in view of the above-mentioned circumstances, and includes a rotating drum for guiding a tape, such as a rotating head drum, and a device for loading a tape onto a predetermined loading path wound around the circumferential surface of the rotating drum. It consists of a reciprocating loading means, for example a loading ring, and a motor capable of forward and reverse rotation, and the motor, the rotating drum, and the loading means are moved through respective transmission mechanisms, and a transmission path between the motor and the rotating drum is provided. A one-way rotation clutch is interposed therein, and when the motor is driven to rotate in one direction, the rotation drum is driven by the transmission of the one-way rotation clutch, and the loading means is moved forward to load the tape, and when the motor is driven to rotate in the opposite direction, the tape is loaded. The tape is unloaded by reciprocating the loading means in a state where the drive of the rotating drum is cut off due to non-transmission of the one-way rotary clutch.

With this configuration, it is possible to drive both the rotating drum and the loading means with one motor, so the number of motors can be reduced and a product can be obtained at low cost. Since the rotating drum does not rotate, accidents such as tape breakage and tangles caused by high-speed tape withdrawal can be prevented, resulting in a highly safe product.

An embodiment in which the present invention is applied to a cassette type VTR will be described below with reference to the drawings.

First, the tape loading system and drive system will be explained with reference to FIGS. 1 to 3. Reference numeral 1 is a tape cassette, and tape 2 is a pair of reels 3a and 3b rotatably provided in the tape cassette 1. Both ends are fastened and wrapped.

This tape cassette 1 is mounted horizontally on a pair of reel stands 4a and 4b, as is conventionally known, and both reels 3a.

3b is engaged with both reel stands 4a and 4b.

Reference numeral 5 denotes a rotary head drum which is inclined at a predetermined angle and is composed of a pair of upper and lower drums, with the lower drum 5b being fixed and the upper drum 5a being a rotating drum.

A pair of rotating heads 6at6b for video are fixed to the upper drum 5a and rotated by the upper drum 5a.

7 is a loading ring arranged around the outer periphery of the rotary head drum 5 and configured to be rotatable within a predetermined inclined plane;
On this loading ring 7 are a plurality of tape guides 8a, 8b which also serve as tape drawers.

8c, 8d, pinch roller 9, etc. are attached.

10 is a capstan, 11 is a full width erase head, 12.1
3 is an audio recording/reproducing head and an erasing head.

14 is a fixed tape guide, and 15 is a tensile pin that also serves as a tape drawer.

1 shows a state in which loading of the tape 20 has been completed.

That is, after loading the tape cassette 1, the loading ring 7
When the tape guides 8a and 8 are rotated counterclockwise, the tape guides 8a and 8
b.

8c and 8d sequentially engage the tape 2, and the tape 2 is sequentially pulled out of the tape cassette 1 by these tape guides.

At this time, the tensile pin 15 also engages with a part of the tape 2 and pulls it out.

When the loading ring 7 rotates by a predetermined angle and the pinch roller 9 moves to the side of the capstan 10, loading is completed and the rotation of the loading ring 7 is stopped.

As shown in the figure, the tape 2 thus pulled out is wound around the circumferential surface of the rotary head drum 50 at a predetermined angle (for example, an angle of 1800 degrees or more), and is then passed around the heads 11, 12, and 13.

Note that if the record or play button (not shown) is pressed in this loading completed state, the pinch roller 9 will move the capstan 1.
0, the tape 2 is driven to run by the capstan 10, and the take-up reel 3b is driven by the take-up reel stand 4b, so that the tape 2 is taken up from the supply reel 3a to the take-up reel 3b. If possible, the recording or reproduction is performed in a conventionally known manner by traveling on the loading path at a predetermined speed.

Further, FIG. 2 shows a state in which the unloading of the tape 2 has been completed.

That is, when the loading ring 7 is rotated backward clockwise in the above loading state and the take-up reel 3b is rotated by the take-up reel stand 4b, the tape 2 is wound onto the take-up reel 3b and placed inside the tape cassette 1. be pulled back to.

Then, when the loading ring 7 rotates by a predetermined angle and the tape guide 8a that preceded during loading returns to the inside of the tape cassette 1, unloading is completed and the rotation of the loading ring 70 stops.

Reference numeral 17 denotes a motor capable of forward and reverse rotation, such as a DC motor, and this motor 17 is inclined parallel to the rotary head drum 5.

A one-way rotation clutch 19 is attached to the motor shaft 18 of this motor 17.
The pulley 20 is rotatably supported in only one direction.

The pulley 22 fixed to the drum shaft 21 of the rotary head drum 5 and the pulley 20 are moved by a belt 23.

Note that in the one-way rotation clutch 19, the motor shaft 18 is the first
When the motor shaft 18 is rotated counterclockwise in the figure, it is in a transmission state, transmitting the rotational force of the motor shaft 18 to the pulley 20, and the motor shaft 1
When the motor 8 is rotated clockwise, which is the opposite direction to the above, it is in a non-transmission state and is configured to cause the pulley 20 to slip with respect to the motor shaft 18.

Further, another pulley 25 is fixed to the motor shaft 18, and a pulley 27 fixed to the idler shaft 29 of the FF idler 26 disposed between the two wheel stands 4a and 4b and the pulley 25 are connected to each other. is moved by belt 28.

Further, a pulley 24 fixed to an idler shaft 35 of an idler 30 arranged to be pressed against the idler 26 and a pulley 32 fixed to a gear shaft 36 of a driving gear 31 of the loading ring 7 are moved by a belt 33. has been done.

The gear 31 is meshed with a large diameter gear 34 formed on the loading ring 7.

Note that 37 is a guide pulley.

Next, the switching mechanism of the idler 30 will be explained with reference to FIGS. 4 to T. The idler 30 is pivotally supported by the idler shaft 35 at the tip of the double ring 43.

An approximately character-shaped eject link 44 is rotatably supported around a fulcrum 45 near the idler 30, and a tension spring is connected between one end 44a of the eject link 44 and the idler shaft 35. 46 is suspended.

Also, there is a g in the vicinity of the outer circumference of the loading ring 7.
A stopper link 47 in the shape of ( ) is rotatably supported around a fulcrum 48 .
A roller 49 is pivotally supported at one end 47a of the roller 7.

The stopper link 47 is urged to rotate clockwise by a tension spring 50, and the roller 49 is constantly pressed against the circumferential surface 7a of the loading ring 7.

Further, a conversion link 51 having a substantially T-shape is rotatably supported at the intermediate portion of both the sinks 44, 470 about a fulcrum 52.

A pin 53 integrally formed on one end 51a of the conversion link 51 is engaged with a groove 54 formed on the other end 47b of the stopper link 47.

The other end 51b of the conversion link 51 is configured to be able to come into contact with the idler shaft 35, and a pin 55 integrally formed near the fulcrum 45 of the eject link 44 comes into contact with the intermediate end 51c. is configured to be

57 is an eject lever, and a pair of guide pins 58
are engaged with each other through a pair of elongated holes 59, and are configured to be slidable in the vertical direction in the figure.

An eject button 60 is fixed to the tip of the eject lever 57, and the eject lever 57 is always urged to slide downward in the figure by a tension spring 61.

Further, a side surface 57a of the eject lever 57 is formed with a high part 62 that protrudes to the left in the figure, and a low part 63 that is lowered from this to the right in the figure. 64.

The idler shaft 35 is urged by the tension spring 46 and is constantly pressed against the wound surface 57a.

Further, a bent piece 65 is integrally formed in a part of the eject lever 57, and this bent piece 65 is brought into contact with the other end 44b of the eject link 44.

Further, an eject release lever 66 is rotatably supported on the outer periphery of the loading ring 7 about a fulcrum 67.

This eject release lever 66 is biased to rotate counterclockwise by a tension spring 68, and a roller 69 pivotally supported at one end 66a of the eject release lever 66 moves around the circumferential surface 7a of the loading ring T.
is constantly crimped.

A lock plate 70 is disposed between the other end 66b of the eject release lever 66 and the eject lever 57 and is perpendicular to the eject lever 57.

The other end 66b of the eject release lever 66 is in contact with a bent piece 79 integrally formed on a part of the lock plate 10.

The lock plate 70 is engaged with a pair of guide pins 71 through a pair of elongated holes so as to be slidable in the left-right direction in the figure, and is urged to slide in the left-hand direction in the figure by a tension spring 72.

The lock pin γ3 fixed on the lock plate 70 is loosely fitted into a lock hole 74 formed in the eject lever 51, and a cam surface 75 and a lock hole 74 are provided at the left edge of the lock hole 740 in the figure. A recess 76 is formed.

A pair of roller depressions 77 and 78 are formed at two locations on the circumferential surface 7a of the loading ring 70.

Next, the procedure for loading and unloading the tape 20 will be explained.

First, at the start of loading, the idler 30 is pressed against the idler 26 by the tension spring 46 as shown in FIG.

Further, both rollers 49° and 69 are pressed onto the circumferential surface 7a of the lobe 1, 9, and 9.

In this state, the motor 17 is driven to rotate counterclockwise as shown in FIG. 1, so that the rotary head drum 5 is driven to rotate counterclockwise, and the loading ring 7 is rotated counterclockwise, as described above. Tape 20 loading is performed.

That is, when the motor 17 is rotated counterclockwise, the rotational force of the motor shaft 18 is transferred to the pulley 20 via the one-way clutch 19.
, the drum shaft 21 is rotationally driven via the belt 23 and pulley 22, and the rotary head drum 5 is rotationally driven in the counterclockwise direction.

At the same time, the rotational force of the motor shaft 18 is applied to the pulley 25,
The idler 3 is transmitted to the idler 26 via the belt 28 and the pulley 27, and is further crimped to the idler 26.
0 to the gear 31 via the pulley 24, belt 33, and pulley 32, and this gear 31 drives the gear 34, and the loading ring 7 is rotationally driven in the counterclockwise direction.

Therefore, during the above-mentioned loading, the rotary head drum 5 and the loading ring 1 are simultaneously driven to rotate by one motor 17.

Note that when the loading ring 7 is rotated by a predetermined angle and the above-mentioned loading is completed, the roller 49 is rotated as shown in FIG.
falls into the recess 77 of the loading ring circumferential surface 7a, and the loading ring 7 stops rotating and is locked at that position.

At this time, as the stopper link 47 is rotated clockwise by the tension spring 50, the conversion link 51 is rotated counterclockwise via the grooves 54 and 53.

Then, since the other ends 51b of the conversion links 5, 1 push the idler shaft 35 upward in the figure, the idler 30 is separated from the idler 26 against the tension spring 46.

As a result, the drive of the loading ring 7 by the gear 31 is cut off, and the above-described loading is completed.

When unloading, press the eject button 60 as shown in Figure 6.
Push the eject lever 57 upward in the figure to release the tension spring 6.
1 and slide in the same direction.

Note that at this time, the lock pin 73 touches the top of the cam surface 15 to the lock plate 7.
It relatively slides and falls into the recess 76 with a zero slide, and the eject lever 57, which has been pushed as described above, is locked in that position.

As the eject lever 57 slides, the bent piece 65 pushes the other end 44b of the eject link 44 upward in the figure, and the eject link 44 is rotated counterclockwise.

As a result, the direction in which the idler 30 is pulled by the tension spring 46 is changed to an intermediate direction between the idler 26 and the take-up reel stand 4b, and at the same time, the idler shaft 35 is moved toward the eject lever 5.
The idler 30 slides down the slope 64 from the high place 62 of No.
It is crimped between the

At this time, the pin 55 of the eject link 44 pushes the intermediate end 51e of the conversion link 51 to the left in the figure and rotates it clockwise, so the stopper link 47 resists the tension spring 50 via the pin 53 and the groove 54. Then, the roller 49 is pulled out from the recess 77 and the loading ring 7 is unlocked.

On the other hand, as the ejector lever 57 slides, a rotation direction switch (not shown) of the remoter 17 is switched, and the motor 17 is now rotated clockwise as shown in FIG. 2 to stop the rotating head drum 5. At the same time, only the loading ring 7 is rotated clockwise to perform the aforementioned unloading of the tape 2.

That is, when the motor 17 is rotated clockwise, the one-way rotation clutch 19 is in a non-transmitting state as described above, so the pulley 20 is not rotated, and therefore the rotating head drum 5
is not rotationally driven.

On the other hand, since the pulley 25 is rotated by the motor shaft 18 at this time, the rotational force is transmitted to the idler 26 via the belt 28 and the pulley 27, and is further transmitted from the idler 30 crimped to the idler 26 to the pulley 24 and the belt 33. ,
is transmitted to the gear 31 via the pulley 32, and this gear 31
drives the gear 34, the loading ring 7 rotates,
Driven.

However, at this time, the gear 31 is rotated by one rotation in the reverse direction of loading due to the reverse rotation drive of the motor 17, so the loading ring 7 is driven to rotate in the reverse clockwise direction.

Further, at this time, since the idler 30 is also crimped to the take-up reel stand 4b, the take-up reel stand 4b is also rotated clockwise by the idler 30.
At step b, the winding wheel 3b is driven to rotate, and the aforementioned tape 20 is wound up.

Note that when the loading ring 7 is rotated by a predetermined angle and the above-described unloading is completed, the roller 69 falls into the recess 78 of the loading ring circumferential surface 7a as shown in FIG.

Then, the eject release lever 66 is rotated counterclockwise by the tension spring 68, and the other end 66b pushes the bent piece 79 of the lock plate 70 to the right in the figure.
0 in the same direction against the tension spring 72.

As a result, the lock pin 73 comes out of the recess 16 to the right in the figure, and the eject lever 57 is unlocked.

Then, the eject lever 57 is slid by the zero-tension spring 61 to the downward movement position in the figure.

As a result, the rotation of the motor 17 is stopped by the switch switching mechanism, and the idler shaft 35 is slid from the low part 63 on the slope 64 and pushed up onto the high part 62 due to the sliding of the eject lever 57.
is separated from the take-up reel stand 4b, and the rotation of the take-up reel 3b is stopped.

Therefore, during the above unloading, the rotating head drum 5
It is possible to rotate only the loading ring 7 without rotating the loading ring 7.

In the above embodiment, the idler 30 is used as a transmission member during loading, but during unloading, the idler 30 is simultaneously crimped onto the idler 26 and the take-up reel stand 4b, thereby connecting the loading ring 7 and the take-up reel. Since both the reel stand 4b and the reel stand are used as transmission members for rotating and driving, the number of parts is small and the mechanism is extremely simple.

Further, according to the present invention, the one-way rotation clutch 19 may have any structure, and its intervening position does not have to be on the motor shaft 18, but can be freely placed at an appropriate position such as the drum shaft 21. It can be placed.

As described above, the present invention uses a single motor to commonly drive the rotating drum and the loading means, so it is possible to eliminate the need for a conventional dedicated motor for loading, and to minimize the use of expensive motors. It is possible to obtain an extremely low-cost product by reducing the amount.

Furthermore, although the rotating drum and the loading means are commonly driven by one motor, a one-way rotating clutch is used to drive only the loading means while the rotating drum is stopped during unloading. Because the rotating drum was rotated at high speed during unloading, the tape that was stuck to the drum due to dew was pulled out at high speed, causing accidents such as tape breakage and tangles. It is possible to eliminate all such things that could occur, resulting in an extremely high level of safety.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a cassette type VTR, in which FIG. 1 is a schematic plan view illustrating a loading completed state, and FIG. 2 is a schematic plan view illustrating an unloading completed state. , FIG. 3 is a partially cutaway front view with the chassis removed, and FIGS. 4 to 7 are plan views of essential parts illustrating the idler switching mechanism. Also, in the symbols used in the drawings, 2 is a tape, 5 is a rotating head drum, 7 is a loading ring, 17 is a motor, 18 is a motor shaft, 19 is a one-way rotating clutch, 2
0, 22, 24, 25゜27.32 are pulleys, 21 is a drum shaft, 23゜28.33 is a belt, 26, 30 is an idler 29.35 is an idler shaft, 31 is a driving gear, 3
4 is a gear, and 36 is a gear shaft.

Claims (1)

[Claims] 1 Consists of a rotating drum for guiding the tape, a reciprocating loading means for loading the tape onto a predetermined loading path wrapped around the circumferential surface of the rotating drum, and a motor capable of forward and reverse rotation. The rotating drum and the loading means are respectively linked via a transmission mechanism, and a one-way rotating clutch is interposed in the transmission path between the motor and the rotating drum, and when the motor is driven to rotate in one direction, the rotation is caused by the transmission of the one-way rotating clutch. At the same time as driving the drum, the loading means is moved forward to load the tape, and when the motor is driven to rotate in the reverse direction, the one-way clutch is not transmitting power, cutting off the drive of the rotating drum, and the loading means is moved back to load the tape. A tape loading device configured to unload.