JPH0345310Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a guide member positioning device suitable for use in a loading mechanism adapted to pull out a tape from a cassette and wind it onto a rotating head drum. .

(Prior Art and its Problems) Conventionally, a helical scan system using a rotating head has been widely adopted in the mechanisms of video tape recorders, digital tape recorders, and the like. With this type of mechanism, the tape is pulled out from the cassette and wound around the rotating head drum for travel, so it is not affected by the accuracy of the cassette half, but it is A guide member is required to be loaded with the rotating head drum, and rattling is likely to occur between this guide member and the guide means for guiding it, such as a guide hole formed in the chassis, which can cause misalignment of the tape running position and vibration. There is a danger that tape running may be adversely affected, which has been a bigger problem than in the past.

Therefore, various positioning mechanisms for positioning the guide member in the loading state have been considered in the past, but all of them only perform positioning in the left-right direction, where the tape tension is large, and do not position the guide member in the vertical direction. This is not a fundamental solution to the problem, as changes in the tape tension etc. may cause the guide member to become misaligned, changing the tape running position or causing noise. Ta.

(Purpose of the invention) The purpose of this invention is to solve the above-mentioned problems by positioning the guide member horizontally and vertically with respect to the traveling direction using a single positioning mechanism.

(Summary of the invention) A truncated cone-shaped engagement surface is formed on the front surface of a guide member that pulls out tape from a cassette and winds it around a rotating head drum, and a positioning member that engages with the guide member in a loading state has an approximately V-shape. By forming a notch in the shape and further forming an inclined surface along the slope of the truncated conical engagement surface of the guide member at the lower edge of the notch, in the loading state, the substantially V-shaped notch is formed. Accordingly, there is provided a novel guide member positioning device in which the guide member is positioned in the horizontal direction and in the vertical direction by the inclined surface.

(Example) In Fig. 2, tape T is stored in cassette C,
FIG. 3 shows an unloading state in which the cassette can be attached and detached, and FIG. 3 shows a loading state in which the tape T is pulled out from the cassette C and wound onto the rotating head drum.

On the chassis 1, reel stands 2a, 2b and a capstan 3 are rotatably arranged.
A motor 4 for driving the reel stand is attached to the chassis 1 between the two reel stands, and a gear 4a attached to the rotating shaft rotates in accordance with the rotational direction of the motor to transmit rotation to the reel stand. A gear 5 is arranged by known means (not shown).

Chassis 1 above reel stands 2a, 2b
A rotary head drum 6 having a magnetic head attached to its outer periphery is rotatably mounted on the top and tilted at a predetermined angle, and is rotated at high speed by a motor (not shown).

On the chassis 1 on both sides of the head drum 6, there are left and right guide members 7a and 7b for pulling out the tape from the cassette C and winding it around the head drum.
A sub-chassis 8 (FIG. 1c) is provided in which guide holes 8a and 8b are formed to guide the sub-chassis.

Guide posts 71a, 72 for loading the tape are provided on the upper surfaces of the guide members 7a, 7b.
a, 71b, and 72b are provided, respectively.
The guide posts 72a and 72b are installed at a predetermined angle so that the tape can be helically wound around the rotary head drum 6.

The guide members 7a, 7b have pins 73a, 74a, 73 protruding from their lower surfaces as shown in FIG. 1c.
b, 74b are inserted into the guide holes 8a, 8b, and the locking ring 75 is inserted on the back side of the chassis 1.
a, 76a, 75b, 76b.

Further, the guide post mounting portion on the upper surface of the guide members 7a, 7b has an engagement surface 77 formed in a truncated cone shape.
a, 77b are formed, and guide holes 8a, 8
On the sub-chassis 8 at the terminal end portion of b, there is a positioning member 9a that engages with the engaging surfaces 77a, 77b of the guide members 7a, 7b to position the guide members when the guide members 7a, 7b reach the terminal ends of the guide holes 8a, 8b. , 9b are attached respectively.

As shown in FIGS. 1a and 1b, the positioning members 9a and 9b have engaging surfaces 77 of the guide members 7a and 7b.
V-shaped notches 91a, 91 that engage with a, 77b
b is formed, whereby each guide member 7a,
7b is positioned in the left-right direction, that is, in the direction perpendicular to the guide holes 8a, 8b. Further, as is clear from FIGS. 1c and 1b, the lower edge of the V-shaped notch facing the chassis 1 has a guide member 7a,
Slanted surfaces 92a and 92b are formed to have the same slope as the inclined surfaces of the engagement surfaces 77a and 77b of the guide members 7a and 7b, and when the engagement surfaces 77a and 77b of the guide members 7a and 7b are pressed, the guide members 7a and 7b are It is configured so that a force is applied in the direction of pressing it onto the chassis 1. This allows the guide members 7a, 7b to be positioned relative to the chassis 1 in the vertical direction.

Furthermore, large diameter portions 81a, 81b are formed at the tips of the guide holes 8a, 8b to allow movement of the pins 73a, 73b so as not to interfere with the positioning operation of the guide members 7a, 7b.

A guide member 7 is provided around the rotating head drum 6.
Ring members 10a, 1 for driving a, 7b
0b are stacked on top of each other and the rollers 11
It is rotatably supported by a to 11c,
Gears 100a and 100b are formed on its outer periphery.

A guide member 7a is attached to the upper ring member 10a.
A sliding plate 13a for overstroke absorption connected by a connecting rod 12a has long holes 131a and 132.
a and pins 101a and 102a, and the ring member 1 is slidably arranged by a spring 14a.
It is urged to move counterclockwise on 0a.

A guide member 7b is attached to the lower ring member 10b.
A sliding plate 13b for overstroke absorption connected by a connecting rod 12b is connected to the elongated holes 131b and 132.
b and pins 101b and 102b to be slidable, and a spring 14b holds the ring member 1
It is biased to move clockwise on 0b.

By rotating the ring members 10a and 10b, the guide members 7a and 7b are moved into the guide hole 8.
It can move according to a and 8b.

On the other hand, the ring members 10a and 10b are gears 15a and 15 rotatably disposed on the chassis 1, respectively.
Gears 15a and 15b are integrally formed gears 151a and 151b, which are always meshed with gear b.
The ring members 10a and 10b are always arranged in a meshed state and rotate in opposite directions to each other, so that the ring members 10a and 10b are always rotated in opposite directions.

The gear 15b includes a small diameter gear 16 of the reduction gear 16.
A large diameter gear 162 integrally formed with a small diameter gear 161 is engaged with a worm gear 17 disposed on the chassis 1,
A pulley 171 that rotates together with the motor 18 is a pulley 19 attached to the rotating shaft of the motor 18 and a belt 20.
Now the rotation is transmitted.

In addition, SW1 and SW2 in the figure are ring members 10a,
With the position detection switch 10b, the ring member 10
On a, switch SW1 is set in the unloading state, and switch SW1 is set in the loading state.
A protrusion 104 is provided that detects the state of each ring member by closing each SW2.

On the left side of the capstan 3, there is a pinch roller 21.
Pinch roller lever 2 with 1 rotatably attached
1 is rotatably disposed about a shaft 22 and biased counterclockwise by a spring 23, that is, in a direction away from the capstan 3. In addition, the pinch roller lever 21 has engaging slopes 241 and 24.
The actuating plate 24 formed with the numeral 2 is arranged so as to be able to rotate coaxially and independently. The pinch roller lever 21 and the actuating plate 24 are connected to each other by a spring 25, and the engagement slope 242 of the actuating plate 24 is normally locked to the pin 212 on the lower surface of the pinch roller lever 21, so that The position is maintained.
Further, on the chassis 1 below the pinch roller 21, an operating rod 27 whose one end is connected to the rod 261 of the plunger 26 is rotatably arranged by a shaft 43, and the other end is operated in the loading state described later. An engagement pin 271 is provided at a position where it can engage with the engagement slope 241 of the plate 24.

A tension regulator 28 is provided on the chassis 1 on the left side of the reel stand 2b to detect the running tape tension and always apply an appropriate back tension to the tape.

The tension regulator 28 is shown in FIGS. 4a to 4c.
As is clear from the figure, there is a lever 31 rotatably arranged around a shaft 29 and biased counterclockwise by a spring 30, and one end of which is attached to the free end of the lever 31 with a shaft 32. It consists of a lever 33 having a pin 331 placed in pressure contact with the tape at the other end.

The lever 31 has one end fixed on the chassis 1, and is connected to the free end of the band 44 by rotating the lever 31. By rotating the lever 31, the tightening force of the band to the reel base 2b can be varied, and the tape can be tightened. It is designed to control the back tension.

On the other hand, the lever 33 is moved by the spring 34.
The engagement piece 311 of the lever 31 is rotated counterclockwise with respect to the pin 332 on the back side of the lever 31.
The rotation range is determined by

On the chassis 1 between both reel stands and the ring member, a control lever 35 for controlling the pinch roller lever 21 and the tension regulator 28 according to the loading operation is provided with elongated holes 351, 352,
It is disposed so as to be slidable left and right by pins 361 and 362, and biased to the left in the figure by a spring 37.

The right end of the control lever 35 is formed with an engagement hole 353 into which the pin 212 is constantly engaged in order to control the rotation of the pinch roller lever 21 according to the loading operation, and the left end is formed with an engagement hole 353 into which the pin 212 is always engaged. An engaging piece 354 that engages with and controls the pin 332 is formed in the center, and an engaging piece 355 that engages with the pin 103 on the ring member 10b is formed in the center.

In the figure, numerals 39, 40, and 42 are fixed tape guide posts, and C1 and C2 are guide rollers inside the cassette half. Also, 41 is sub chassis 8
(not shown) a fixed tape guide post mounted above.

The tape recorder of the present invention has the above structure, and its operation will be explained next.

In the unloading state shown in FIG. 2, the ring members 10a and 10b are rotated clockwise and counterclockwise, respectively, and the unloading state is detected by closing the switch SW1 by the engager 104. There is.

Both guide members 7a and 7b have guide holes 8.
a, 8b start end, that is, at the lowest position in the figure, and each guide post 71a, 72a, 71b, 72
b is stored inside the tape in cassette C.

Further, the control lever 35 is slid to the right by having its engagement piece 355 pressed by the pin 103 of the ring member 106. Therefore, the pinch roller lever 21 is rotated counterclockwise by the engagement hole 353 to move the pinch roller 211 to the cassette C.
It is located inside the inner tape T.

Regarding the tension regulator 28, the pin 332 of the lever 33 is pushed to the right by the engagement piece 354 of the control lever 35.
As is clear with reference to FIG. 4a, the lever 31 is locked to the stopper 37, and only the lever 33 is rotated clockwise against the spring 34 to push the pin 331 into the cassette C. It is in a stored state.

In this state, a loading operation is started by rotating the motor 18 by a control circuit (not shown) and rotating the ring members 10a and 10b counterclockwise and clockwise, respectively.

When the ring members 10a and 10b start rotating, the guide members 7a and 7b respectively move toward the sliding plate 1.
3a, 13b and the connecting rods 12a, 12b, the tape T is moved upward toward the rotary head drum 6 in the guide holes 8a, 8b, and the tape T is pulled out to the outside of the cassette C.

On the other hand, when the ring member 10b is rotated clockwise, the pin 103 leaves the engagement piece 355 of the control lever 35, and the control lever 35 is moved to the left in the figure by the spring 36.

When the control lever 35 moves to the left, the pinch roller lever 21 is rotated clockwise, and the pinch roller 211 moves to a position facing the capstan 3.

Further, the tension regulator 28 has the engagement piece 3
54 leaves the pin 332, the lever 3
3 is rotated counterclockwise by the spring 34, and the pin 332 is locked to the engagement piece 311 of the lever 31, as shown in FIG. 4b. As a result, the lever 31 and the lever 33 are fixed so as to move together by the elasticity of the spring 34, and from now on, the tension regulator 28 is moved as shown in FIG.
The lever 31 rotates around the rotating shaft 29 of 1 and the lever 33 have the same length.

Therefore, the length of the lever of the tension regulator 28 can be made longer, and changes in tape tension can be detected more precisely and the back tension applied to the reel stand 2b can be adjusted, thereby producing a good tape. You can get a run.

Further, the guide members 7a, 7b are connected to the guide holes 8a, 8.
When the terminal b is reached, as shown in Fig. 1 b and c,
The truncated conical engagement surfaces 77a, 7 formed on the front surface thereof
7b is the notch 91a, 9 of the positioning members 9a, 9b.
1b, and as described above, positioning is performed in the left and right direction, and the inclined surfaces 92a, 9 of the lower edge
2b toward the chassis, and positioning in the vertical direction is performed.

Since the rotation stroke of the ring members 10a, 10b is set larger than the movement range of the guide members 7a, 7b, the ring members 10a, 10b
b, the guide members 7a, 7b are the positioning members 9a,
Even after being engaged with 9b, it rotates slightly. This causes the sliding plates 13a, 13b to spring 14a, 14.
b, and the guide members 7a, 7b slide on the ring members 10a, 10b against the spring 1.
4a, 14b are pressed against the positioning members 9a, 9b, and the notches 91a, 91b and the inclined surface 92
a and 92b, it is reliably positioned without wobbling.

When the switch SW2 is closed by the engaging element 104 on the ring member 10a, the loading state is detected and the motor 18 is stopped.

In addition, when the loading operation is completed, the engaging slope 2 of the actuating plate 24 is connected to the pin 271 of the lever 27.
41 are facing each other, and when the plunger 26 is excited and the lever 27 is rotated clockwise, the pin 27
1 presses against the engaging slope 241 of the actuating plate 24 and rotates it clockwise. As a result, the pinch roller lever 21 is biased clockwise by the elasticity of the spring 25, and the pinch roller 211 is pressed against the capstan 3, resulting in the tape running state shown in FIG. 3.

In this state, the tape T comes out from the reel stand 2b side, and the guide post 42 and the pin 33 of the lever 33
1. It runs through the guide post 41, the guide posts 71b and 72b of the guide member 7b, the rotating head drum 6, the guide posts 72a and 71a of the guide member 7a, the guide post 39, the capstan 3, and the guide post 40, and is connected to the winding side. It is wound onto the reel stand 2a.

Needless to say, the motor 4 is rotated to engage the oscillating gear 5 with the reel stand on the side corresponding to the direction of rotation, thereby rotating the oscillating gear 5.

When transitioning from the loading state to the unloading state, the operation that is completely opposite to the above-mentioned loading operation may be performed.

In the tape running state shown in FIG. 3, after turning off the plunger 26 and separating the pinch roller 211 from the capstan 3, the motor 18 is rotated in the opposite direction to the loading operation, and the ring member 1
Rotate 0a and 10b clockwise and counterclockwise, respectively.

As a result, the guide members 7a, 7b leave the periphery of the rotary head drum 6, and the guide holes 8a, 8b
Move inside to cassette C. When the guide members 7a, 7b return to the starting ends of the guide holes 8a, 8b and the ring member 10b rotates back to its original position, the control lever 35 is slid to the right by the pin 103, and the pinch roller lever 21 is rotated counterclockwise and stored into the cassette C again. At the same time, the engagement piece 354 of the control lever 35
By lever 3 of tension regulator 28
No. 3 pin 332 is pushed to the right. The lever 33 is initially moved by the lever 31 by the spring 34.
It is rotated clockwise while being integrated, as shown in Fig. 4b.
As shown in FIG. 4, after the lever 31 is pressed against the stopper 37, only the lever 33 is rotated clockwise against the spring 34, and is housed in the cassette C as shown in FIG. 4a.

Through the above operations, the unloading state shown in FIG. 2 is again achieved.

It goes without saying that when the guide members 7a, 7b are stored in the cassette C, the reel stand 2b is rotated counterclockwise to take up the slack in the tape.

(Effect of the invention) The guide member positioning device of the present invention forms a truncated cone-shaped engagement surface on the front surface of the guide member that pulls out the tape from the cassette and winds it around the rotating head drum, and in the loading state, the guide member By forming a substantially V-shaped notch in the positioning member that engages with the guide member, and further forming an inclined surface along the slope of the truncated conical engagement surface of the guide member at the lower edge of the notch, In this case, since the guide member is positioned in the horizontal direction by the approximately V-shaped notch and in the vertical direction by the inclined surface, a single positioning device is used to position the guide member in the horizontal direction. It is possible to perform not only positioning but also vertical positioning, and eliminate vertical deviation of the guide member, which was previously neglected.
It is possible to prevent harmful effects such as vibrations on tape running.

Furthermore, since all positioning can be performed for one guide member using only one positioning member, the configuration is simple and cost-effective, and is particularly effective in small-sized equipment.

[Brief explanation of the drawing]

Each figure shows an example of the present invention.
Figures 1 a to d are partial plan views and sectional views for explaining the positioning operation of the guide member, Figures 2 and 3.
The figures are plan views of the entire loading mechanism showing an unloading state and a loading state, respectively, and FIGS. 4a to 4c are plan views for explaining the structure and operation of the tension regulator. Explanation of symbols, 7a, 7b... Guide member, 8
a, 8b...Guide hole, 9a, 9b...Positioning member, 10a, 10b...Ring member, 28...
Tension regulator, 31... second lever, 33... first lever, 35... control lever, C... cassette.

Claims (1)

[Scope of utility model registration request] located inside the tape in the cassette in an unloading state where the cassette can be attached and detached;
a guide member that pulls out the tape from the cassette and winds it around the rotary head drum in response to a loading operation; and a positioning member that engages with the front surface of the guide member in a loading state in which the tape is wound around the rotary head drum. A guide member positioning device comprising: a truncated cone-shaped engagement surface formed on the front surface of the guide member; and a substantially V-shaped notch formed on the surface of the positioning member that engages with the guide member front surface. is formed, and the lower edge of the notch is formed with an inclined surface along the slope of the truncated conical engagement surface of the guide member, and when the guide member is engaged with the positioning member, Positioning is performed in the left and right direction with respect to the traveling direction by the approximately V-shaped notch,
A positioning device for a guide member configured to perform vertical positioning using the inclined surface.