JPH0454583Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a tape loading device that is most suitable for application to, for example, a cassette-type video tape recorder. The present invention relates to a tape loading device which allows a pair of tape guide blocks to reciprocate along both sides of a rotary head drum.

[Summary of the idea]

In this invention, a pair of upper and lower ring gears arranged around the outer periphery of a rotating head drum are driven to rotate in opposite directions with a pair of drive gears, and a pair of tape guide blocks are guided by a pair of guide rails via a pair of connecting links. The tape is reciprocated between the backward movement position and the forward movement position along both sides of the rotating head drum, and the tape is pulled out from inside the tape cassette and wound around the circumferential surface of the rotating head drum by the forward movement of both tape guide blocks. In the tape loading device configured as shown in FIG. By positioning the rotational reference position, it is possible to easily adjust the positioning of the two rotational reference positions while making use of a simple drive mechanism such as one motor and both drive gears.

[Conventional technology]

The applicant of the present invention has disclosed, for example, Japanese Patent Application No. 58-85596 as an earlier invention of this type of tape loading device.
I have already applied for the No.

This prior invention includes a rotating head drum, a pair of upper and lower ring gears rotatably disposed around the outer periphery of the rotating head drum, and a pair of drive gears that are driven to rotate in opposite directions by a single motor to drive both ring gears to rotate in opposite directions. a pair of tape guide blocks arranged reciprocally along both sides of the rotary head drum; a pair of guide rails for guiding both tape guide blocks between a backward movement position and a forward movement position; It has a pair of connecting links that connect both ring gears and both tape guide blocks, and by driving both ring gears to rotate in opposite directions to each other, both tape guide blocks can be connected to both guide rails via both connecting links. The tape is reciprocated between the backward movement position and the forward movement position along both sides of the rotary head drum while being guided by the tape guide block, and the tape is pulled out from the inside of the tape cassette by the backward movement of both tape guide blocks, and the tape is drawn out from the inside of the tape cassette, and the tape is drawn out from the inside of the tape cassette, and the tape is drawn out from the inside of the tape cassette, and the tape is drawn out from the inside of the tape cassette, and the tape is drawn out from the inside of the tape cassette, and the tape is drawn out from the inside of the tape cassette, and the tape is drawn out from the inside of the tape cassette, and the tape is drawn out from the inside of the tape cassette, and the tape is drawn out from the inside of the tape cassette, and the tape is pulled out from the inside of the tape cassette by the backward movement of both tape guide blocks. It is designed to be wrapped around.

[Problem that the invention attempts to solve]

In the prior invention described above, since the moving distance and movement timing between the backward movement position and the forward movement position of both tape guide blocks are the same, one motor drives both drive gears to rotate in opposite directions. A drive gear drives both ring gears to rotate in opposite directions. According to this, the drive mechanism for both ring gears has a simple structure using one motor, both drive gears, etc., but the following problems occur.

That is, since both ring gears are driven to rotate in opposite directions through both drive gears by a single motor, if even one tooth is out of engagement between both drive gears and both ring gears, the rotational reference positions (relative position) and the rotational reference positions (absolute positions) of both ring gears relative to both drive gears are shifted.
If the rotational reference positions of both ring gears are deviated from each other, a problem arises in which one of the two tape guide blocks is positioned while the other is not positioned in the backward movement position and the forward movement position. In the backward movement position, the tape guide block is not properly inserted into the tape cassette, damaging the tape or making it impossible to pull out the tape. In addition, in the forward position, the tape guide block is not positioned properly, so the tape is not wound around the rotating head drum, resulting in unstable tape running, which not only significantly deteriorates the recording or playback characteristics, but also In some cases, recording or playback may become impossible.

Even if the rotational reference positions of both ring gears are accurately positioned, if the rotational reference positions of both ring gears are deviated from each other with respect to both drive gears, the same inconvenience as described above will still occur.

Therefore, it is necessary to accurately position and adjust the rotational reference positions of both ring gears with respect to each other and the rotational reference positions of both ring gears with respect to both drive gears. However, in the prior invention, this adjustment was performed by a trial-and-error method in which both ring gears were rotated little by little while repeatedly attaching and detaching both drive gears to both ring gears. For this reason, the number of man-hours for positioning and adjustment during assembly and service is extremely large and troublesome.

Therefore, the present invention makes it possible to easily adjust the rotation reference positions of both ring gears with respect to each other and the rotation reference positions of both ring gears with respect to both drive gears, while making use of a simple drive mechanism using one motor, both drive gears, etc. It is something.

[Means for solving problems]

In the tape loading device described above, the present invention provides a base on which the rotary head drum is disposed, a reference hole for each of the ring gears, and each of these reference holes serves as a rotational reference position for the two ring gears and a reference hole for each of the two drive gears. By aligning the reference rotational positions of both ring gears with respect to each other and aligning them vertically, and inserting a reference pin into each of the reference holes, the reference rotational positions of both ring gears with respect to each other and the reference positions of both drive gears are set. The rotation reference position of both ring gears is determined.

[Operation] According to the present invention, when the reference holes provided in the base and both ring gears are aligned vertically and a reference pin is inserted into each of these holes, the rotational reference positions of both ring gears and both rings can be adjusted. The rotational reference positions of both ring gears relative to the drive gear are accurately positioned. Since it is sufficient to engage both drive gears with both ring gears in this state, the positioning adjustment of the two rotational reference positions can be easily performed.

〔Example〕

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

First, as shown in FIG. 2, this tape loading device consists of a pair of tape guide blocks (hereinafter simply referred to as blocks) that are moved forward along both sides of a rotating head drum (hereinafter simply referred to as drums) 1. 2 and 3, the tape 5 is pulled out from within the tape cassette 4 and is wound (loaded) around the circumferential surface of the drum 1 in a predetermined spiral in an approximately Ω shape.

That is, as shown in FIGS. 2 to 4, the drum 1 is arranged vertically on a base 6, and the slope of the upper surface of the base 6 causes the drum 1 to tilt forward at a predetermined angle. Note that the base 6 may be the chassis itself. A pair of guide rails 8 and 9 are arranged on both sides of the drum 1. These guide rails 8 and 9 are formed by symmetrically arranging belt-shaped plates curved in an approximately J-shape along the circumferential surface of the drum 1, and a guide groove 1 is formed along the center of each of the guide rails 8 and 9.
0 is formed. and both guide rails 8,
Both blocks 2 and 3 are placed on the block 9. Both blocks 2 and 3 each have two tape guides mounted on a movable table 11: a fixed guide 12 made of a cylindrical pin and a roller guide 13 made of a cylindrical rotating roller. A pair of guide pins 14 and 15 fixed to the lower surfaces of both movable tables 11 at a distance are inserted into both guide grooves 10. Therefore, both blocks 2 and 3 are connected to both guide grooves 10.
It slides on both guide rails 8 and 9 while being guided by the drum 1, and reciprocates along both sides of the drum 1 between the backward movement position shown by the dashed line and the forward movement position shown by the solid line in FIG. It is configured to Note that the movement distance and movement timing of both blocks 2 and 3 are the same. Further, as shown in FIG. 3, one guide rail 8 is approximately parallel to the horizontal plane, and as shown in FIG.
is gradually inclined downward with respect to the horizontal plane as it approaches the forward movement position.

Next, a pair of upper and lower ring gears 17 and 18 are rotatably arranged on the outer periphery of the lower end of the drum 1 so as to be parallel to the slope of the upper surface of the base 6. A pair of drive gears 19 and 20 are engaged with both ring gears 17 and 18, respectively, and a pair of intermediate gears 21 and 22 are engaged with each other. and intermediate gear 2
2, a gear 25 fixed to the motor shaft of the motor 24;
is engaged. The gears 19 to 22, motor 24, etc. are housed in one gear box 26.

Next, both blocks 2, 3 and both ring gears 17,
18 are connected to each other by a pair of connecting links 27 and 28. These connecting links 27 and 28 are curved in an arc shape, and their front ends are engaged with both link gears 17 and 18 by a pair of engagement pins 29, and their rear ends are approximately U-shaped. It is raised upward and engaged with the lower ends of both guide pins 14 of both blocks 2 and 3.

By the way, as shown in FIGS. 1, 3 and 4, reference holes 31, 32 and 33 are provided in the base 6 and both ring gears 17 and 18, respectively. Each of these reference holes 31, 32, 33 is a rotation reference position (relative position) between both ring gears 17, 18.
and a state in which the rotation reference positions (absolute positions) of both ring gears 17 and 18 with respect to both drive gears 19 and 20 are aligned, that is, in the embodiment, both blocks 2 and 3
are set so that they are vertically aligned in a straight line when they are positioned at the forward movement position. In this embodiment, as shown in FIG. 2, the guide rails 8 and 9 are located at the top of the inclined base 6 and the ring gears 17 and 18, and are located in the middle of the guide rails 8 and 9, which are open at the top. Each reference hole 31 is aligned vertically,
A reference pin 34 is configured to be removably inserted into 32 and 33 from above.

According to the tape loading device configured as described above, first, the base 6 and both ring gears 17, 1
Both ring gears 17 and 18 are rotated so that the reference holes 31, 32, and 33 with respect to the base 6 are aligned vertically, and the reference pin 34 is inserted from above into each of the reference holes 31, 32, and 33. The positions of both ring gears 17 and 18 are fixed relative to each other. In this state, gearbox 2 is connected to both ring gears 17 and 18.
Both drive gears 19 and 20 of No. 6 are engaged. As a result, with the reference rotational positions of both ring gears 17 and 18 relative to each other and the reference rotational positions of both ring gears 17 and 18 relative to both drive gears 19 and 20 being accurately positioned, both drive gears 19 and 18 are connected to both ring gears 17 and 18. 20 will be engaged. Therefore, the two positioning adjustments of the rotational reference positions of both ring gears 17 and 18 relative to each other and the rotational reference positions of both ring gears 17 and 18 relative to both driving gears 19 and 20 can be simultaneously performed with one touch. After adjusting the positioning, insert the reference pin 34 into each reference hole 31,
The reference pin 34 can be inserted and removed very easily from the open upper side.

Next, in the tape loading device in which the ring gears 17 and 18 are adjusted in position as described above, when the tape cassette 4 is loaded, the fixed guides 12 and roller guides of the blocks 2 and 3 in the backward movement position are moved. 13 is inserted relatively inside the tape 5 in the tape cassette 4. and motor 2
4 is rotated in the forward direction, and loading of the tape 5 is started. That is, when the motor 24 is driven to rotate forward, both drive gears 19 and 20 are driven to rotate in opposite directions via both intermediate gears 21 and 22, and both ring gears 17 and 18 are driven to rotate in opposite directions to each other in the directions of arrows a and b. be done. Then, both ring gears 17, 18 pull both connecting links 27, 28, and these connecting links 27, 28 pull both guide pins 14 of both blocks 2, 3. As a result, both blocks 2 and 3
is guided by both guide grooves 10 and slides on both guide rails 8 and 9, and is moved forward from the backward movement position in the directions of arrows c and d, and the fixed guides 12 and roller guides of both blocks 2 and 3 13 is tape 5
is locked, and the tape 5 is gradually drawn out from inside the tape cassette 4 to both sides of the drum 1. When both blocks 2 and 3 are moved forward to the forward movement position shown by the solid line, a pair of U grooves 36 provided at both ends of both blocks 2 and 3 are connected to both guide rails 8 and 3.
The blocks 2 and 3 are engaged with a pair of positioning pins 37 fixed on the block 9, and both blocks 2 and 3 are positioned at the forward movement position. As a result, the tape 5 is wound around the circumferential surface of the drum 1 in a predetermined spiral in a substantially Ω shape.

By the way, as mentioned above, both ring gears 17,
18 and both drive gears 19,
Since the rotational reference positions of both ring gears 17 and 18 relative to ring gears 20 are accurately positioned, both blocks 2 and 3 are not displaced in this forward movement position and are both accurately positioned. Therefore,
The tape 5 is run extremely stably on the circumferential surface of the drum 1. Note that the drum 1 is rotated at high speed in the direction of arrow e, and the tape 5 is run at a constant speed in the direction of arrow f.

Next, the tape 5 is unloaded by the reverse operation of the above-described loading. That is, by driving the motor 24 in reverse rotation, both drive gears 1
9 and 20 are driven to rotate in opposite directions, and both ring gears 17 and 18 are driven to rotate in opposite directions in directions of arrows a' and b'. Then, both blocks 2, 3 are pressed by both connecting links 27, 28, and both blocks 2, 3 are pressed.
3 is moved back on both guide rails 8, 9 in the directions of arrows c' and d'. Both blocks 2 and 3 are then returned to the return position within the tape cassette 4. Note that the tape 5 is wound up in conjunction with the backward movement of both blocks 2 and 3, and is stored in the tape cassette 4.

By the way, in this case as well, both ring gears 17 and 18
Rotation reference position and both drive gears 19, 20
Since the rotational reference positions of both ring gears 17 and 18 are accurately positioned relative to each other, the blocks 2 and 3 are not displaced in this backward movement position, and both blocks are reliably positioned within the tape cassette 4. Therefore, an accident in which the tape cassette 4 is ejected while the tape 5 is caught in both blocks 2 and 3 can be prevented.

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

For example, in the embodiment, each reference hole was set so that it was aligned vertically with both tape guide blocks positioned at the forward movement position, but when both tape guide blocks were positioned at the backward movement position or may be set between the backward movement position and the forward movement position.

The present invention can be widely applied to various tape loading devices other than cassette video tape recorders.

[Effect of idea]

The present invention is achieved by inserting reference pins into reference holes provided in the base and both ring gears.
Rotation reference position (relative position) between both ring gears
and the rotation reference positions (absolute positions) of both ring gears relative to both drive gears can be simultaneously positioned with one touch. Therefore, there is no need to repeatedly attach and detach both drive gears to and from both ring gears, rotate both ring gears little by little, and perform these positioning adjustments by trial and error. The positioning adjustment of the two rotational reference positions can be performed extremely easily while making use of a simple drive mechanism using a drive gear, etc., and the number of man-hours for positioning adjustment during assembly and service can be significantly reduced.

Moreover, the positioning structure using the reference hole and reference pin is extremely simple, so it can be installed extremely easily in tape loading equipment where various mechanisms are crowded together, and it also requires major modification of conventional tape loading equipment. It can be applied without doing anything. The positioning adjustment work is also very easy.

[Brief explanation of the drawing]

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 perspective view of the main parts explaining the positioning of both ring gears, and FIG. 2 is a loading device. FIG. 3 is a left side view of the entire device, and FIG. 4 is a right side view of the entire device for explaining the operation. In addition, in the symbols used in the drawings, 1... Rotating head drum, 2, 3... Tape guide block,
4... Tape cassette, 5... Tape, 6... Base, 8, 9... Guide rail, 17, 18... Ring gear, 19, 20... Drive gear, 24... Motor, 27, 28... Connecting link, 31, 32,
33... Reference hole, 34... Reference pin.

Claims (1)

[Claims for Utility Model Registration] A rotating head drum, a pair of upper and lower ring gears rotatably disposed around the outer periphery of the rotating head drum, and a pair of ring gears that are driven to rotate in opposite directions by a single motor to drive both ring gears to rotate in opposite directions. a pair of tape guide blocks arranged reciprocally along both sides of the rotary head drum, and a pair of guide rails for guiding both tape guide blocks between a backward movement position and a forward movement position. and a pair of connecting links connecting both the ring gears and both the tape guide blocks, and by driving both the ring gears to rotate in opposite directions, the both tape guide blocks can be connected to the both tape guide blocks via the connecting links. The tape is reciprocated between a backward movement position and a forward movement position along both sides of the rotary head drum while being guided by guide rails, and the tape is pulled out from inside the tape cassette by the forward movement of both tape guide blocks, and the tape is moved back and forth between the rotary head drum and the tape cassette. In the tape loading device configured to wrap the tape around the circumference of the rotary head drum, a reference hole is provided in each of the base on which the rotary head drum is disposed, and both of the ring gears, and each of these reference holes is located at a reference rotational position of the both of the ring gears. By setting the rotational reference positions of both ring gears with respect to both of the drive gears so that they are aligned vertically and in a straight line, and by inserting a reference pin into each of the reference holes, the rotational reference positions of both ring gears and the A tape loading device characterized in that it is configured to position rotational reference positions of both ring gears with respect to both drive gears.