JPS61188772A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To eliminate the gap of transfer volume of the first and second tape pull out materials due to back lash by mating the first and second pull out materials with the same reciprocating motion part material. CONSTITUTION:The first loading gear 106 and the second loading gear 107 are respectively mating with friction rod, and the mating thread of each gear is only one with the same speed or rotation. By such structure the relative fluctuation of movement volume due to the back lash between the first pull out block 36 and second pull out block 40 becomes small and the volume of absolute movement also becomes smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to pulling out a magnetic tape from a cassette that incorporates a pair of reel hubs for winding magnetic tape to the outside of the cassette, and applying the magnetic tape to a rotating magnetic head or the like installed outside the cassette. The present invention relates to a magnetic tape device that records or reproduces signals, or records and reproduces signals (hereinafter referred to as recording/reproducing) by causing the magnetic tape device to run along a head.

2. Description of the Related Art In general, a magnetic tape device such as a cassette video tape recorder pulls out a magnetic tape from a cassette and runs it along a magnetic head. Since a plunger and a complicated latch mechanism are required to switch and transmit the motor driving force to the magnetic tape drawer and the tape drive, many devices are equipped with a motor exclusively for magnetic tape drawer.

However, the video tape recorder equipped with the above-described motor for drawing out the magnetic tape has a structure in which the rotation of the motor is directly transmitted, and the magnetic tape drawing member is set at the first position for drawing out the magnetic tape in the cassette. A second step that pulls out the magnetic tape to the outside of the cassette and attaches it to the magnetic head.
Since the magnetic tape pull-out member was moved back and forth between the two positions, the stop positions of the magnetic tape pull-out member at the first and second positions depended on the rotation stop position of the motor.

Therefore, in order to solve this problem, in recent years, a magnetic tape device has been proposed that has a drive means that converts the continuous rotational motion of the motor into intermittent rotational motion and drives the magnetic tape pull-out means according to the amount of the intermittent rotation. It's starting to look like this. For example, in the magnetic tape device described in Japanese Patent Publication No. 69-27983, the driving means includes a cam that interlocks with a motor, a sector gear that swings following the cam, and a gear that meshes with the sector gear. has been proposed.

An example of the above-mentioned conventional magnetic tape device (Japanese Patent Publication No. 59-27983) will be described below with reference to the drawings.

In FIGS. 9 to 11, the shaft 4 to be planted on the base 8i2
．． When the cassette 12 is installed in the main body of the apparatus, the supply reel stand 8 and the take-up reel stand 10, which are rotatably fitted into the cassette 12 and the take-up reel hub 1
6 and rotate together.

The magnetic tape 18 wound on the supply reel hub 14 is inserted into a pair of notches 20.22 provided at the front of the cassette 12.
is guided so as to cover the front surface of the winding reel hub 16 and wound onto the take-up reel hub 16.

Guide posts 24.26 and 28.30 are disposed within the pair of notches 20.22 for pulling out and guiding two magnetic tapes, respectively. The guide posts 24 and 26 are connected to the sub-board 3 placed parallel to the board 2.
(It is planted on a first drawer block 36 that slides guided by a first groove 34 on 2, and similarly a guide boss)
28 and 30 are implanted on a second drawer block 40 that slides while being guided by a second groove 38 on the sub-board 32.

A pair of shafts 42 and 44 are implanted on the substrate 2 side of the sub-board 32, and a pair of gears 4 are rotatably mounted on the shafts 42 and 44.
6.48 are loosely fitted so that they mesh with each other. gear 46
A long 6 formed at one end of the arm 60 that rotates integrally with the
2 is slidably guided on the first drawer block 3e and is slidably engaged with the bin 64 which is drawn against the first drawer block 36 by the first spring 37, so that the gear 46 is rotated by a predetermined angle clockwise in FIG. 9, the first drawer block 36 is guided by the first groove 34 and moves in the direction of the arrow to a predetermined position.
24 and 26 move to the position indicated by the dotted line in Figure 1 while pulling out the magnetic tape 18.

In this state, the first drawer block 36 is pressed against the stopper 25 by the elastic force of the first spring 37. Similarly, an elongated hole 56 formed at one end of an arm 56 that rotates integrally with the gear 48 is slidably guided on the second drawer block 40, and the second spring 41 pulls the second drawer out. The second drawer block 40 is slidably fitted into the pin 68 which is drawn against the block 40, so that when the gear 48 rotates a predetermined angle counterclockwise in FIG. Since the guide post 28.degree. 3o is guided and moves in the direction indicated by the arrow at the predetermined position 1, the guide post 28.degree. 3o moves to the position indicated by the dotted line in FIG. 9 while drawing out the magnetic tape 18. In this state, the second drawer block 40 is pressed against the stopper 29 by the elastic force of the second spring 41, as described above. The pulled-out magnetic tape 18 comes into contact with a drum 60 and a fixed head 62, which have a rotating head (not shown) inside.

On the other hand, a belt 66 is attached to the shaft 64 installed on the back side of the substrate 2.
A cam 2 having a gear on its outer periphery and driven by a motor 7o via a pulley 67 and a gear 68 is loosely fitted to be rotatable. As shown in FIG. 10, the cam 72 is a positive cam having grooves 74 extending over 360, and its lift curve varies over a rotation angle of 40 to 3600 as shown in FIG.
The cam follower, which will be described later, moves only between the two.

Further, a shaft 76 is installed on the back side of the base plate 2, and a sector gear 78 having a collar follower 76 that fits into the groove 74 of the cam 72 is loosely fitted in a rotatable manner. The toothed portion 80 is engaged with a small gear 84 that is loosely and rotatably fitted onto a shaft 82 that is implanted on the back side of the base plate 2. The large gear 86, which rotates together with the small gear 84, meshes with the aforementioned gear 46 that extends from the back side of the substrate 2 through a hole (not shown) formed in the base 822. That is, when the cam 72 starts to rotate counterclockwise from the position shown in FIG.
Then, the sector gear 78 begins to rotate counterclockwise in FIG. 2 about the shaft 76, and the gear 46 begins to rotate clockwise in FIG. 9 about the shaft 42 via the small gear 84 and the large gear 86. gear 4
8 rotates counterclockwise in FIG. 9 around a shaft 44, and guide bosses 24, 26, 28, and 30 move in the direction of the arrow to pull the magnetic tape 18 out of the cassette 12. When the rotation angle of the cam 720 reaches 360 degrees, the sector gear 78
stops rotating, but just before that, the first drawer block 36 and the second drawer block 4o come into contact with the stoppers 25 and 29, respectively.

When the guide posts 24, 26 and 28.degree. 30 reach the positions indicated by dotted lines, a switch (not shown) is turned off and the rotation of the motor 70 is stopped.

A capstan 88 rotatably disposed on the base gi2 is rotated clockwise in FIG. 9 by a capstan motor 92 via a belt 90.

The pinch roller 94 is located at the position shown by the solid line in FIG. 9 in the stop mode, and moves to the position shown by the dotted line in FIG.
is moved to the right in Figure 1. in this case,
The transferred magnetic tape 18 is wound onto the take-up reel hub 16 by well-known means.

Next, the operation will be explained.

When the record/playback switch (not shown) is pressed from the stop mode shown by the solid line in FIG. 9, the motor 70 moves clockwise in FIG.
begins to rotate counterclockwise. 700 rotations of the motor are transmitted to the cam 72 via the belt 66 and the gear 68, but as shown in FIG. 11, even when the motor 70 starts rotating, the sector gear 78 does not start moving immediately. When the rotation angle of the cam 2 exceeds 40 degrees, the cam follower 76 moves to the left in FIG. 10, so the sector gear 78 rotates counterclockwise in FIG. : The gear 46 begins to rotate clockwise in FIG. 9, and the gear 48 begins to rotate counterclockwise. Accordingly, the arm 60, which rotates integrally with the gear 46, rotates clockwise in FIG.
moves in the direction of the arrow, so in the end, the guide post 24
．． 26 also moves in the direction indicated by the arrow to pull out the magnetic tape 18 to the outside of the cassette 12. Similarly, the arm 64, which rotates integrally with the gear 4, rotates counterclockwise in FIG.
Since the second drawer unit 4° with the bin 68 fitted in the elongated hole 66 also moves in the direction of the arrow, the guide posts 28 and 30 also move in the direction of the arrow, and the magnetic tape 1
8 to the outside of the cassette 12.

When the rotation angle of the cam 72 reaches 360 degrees, the guide post)3
4.26 and 28.30 move to the positions indicated by the dotted lines in FIG. 1, and the tape draw-out completion switch (not shown) is turned off, cutting off the power supply to the motor 70.

When the tape withdrawal completion switch (not shown) described above is turned on, the plunger (not shown) operates, and the pinch roller 94 moves from the solid line position to the dotted line position in FIG. Together they transport the magnetic tape 18 to the right in FIG. 9, and the take-up reel hub 16 takes it up by known means. In this manner, the magnetic tape 18 runs along the drum 60 and the fixed head 62, and signals are recorded or reproduced.

When a stop switch (not shown) is pressed, power to the motor 92 and plunger (not shown) is cut off, the capstan 88 is stopped, and the pinch roller 94 returns to the position shown in solid line in FIG. The motor 7° rotates counterclockwise in FIG.
4.26 and 28.30 return to the positions indicated by the solid lines in FIG.

At this time, the magnetic tape 18 that has been pulled out is stored in the cassette 12 by well-known means.

When a tape storage completion switch (not shown) is turned off, the motor 70 stops rotating.

Problems to be Solved by the Invention However, in the above-described configuration, the amount of movement of the guide post 24 and 26, which is the first magnetic tape pull-out member, is as follows.
Guide post 28, which is the second magnetic tape pull-out member.
Compared to 30, the gear 48.48 always has less pack lash (play between the tooth surfaces when a pair of gears mesh), and the positioning accuracy at the stop position shown by the solid line in Fig. 9 is poor. There was a problem.

The present invention solves the problems of such conventional magnetic tape devices, and provides a magnetic tape device that has a simple structure and can perform stop positioning and movement of a pair of magnetic tape draw-out members reliably and easily without any fluctuation. This is what I am trying to do.

Means for Solving the Problems In order to solve the above problems, in the magnetic tape device of the present invention, the first and second drawer drive members do not have a direct engagement relationship with each other, and the first and second drawer drive members do not have a direct engagement relationship with each other. By engaging with the second drawer drive member and reciprocating,
The present invention includes a reciprocating member that rotates the first drawer drive member and the second drawer drive member forward and backward in mutually different directions.

Operation According to the present invention, with the above-described configuration, the first and second drawer drive members are respectively engaged with the same reciprocating member, so that the amount of movement of the first and second magnetic tape drawer members due to the pack lash is reduced. There will be no difference.

Embodiment Hereinafter, a magnetic tape device according to an embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 to 8, the shaft 4.6 is implanted on the substrate 2.
When the cassette 12 is installed in the main body of the apparatus, the supply reel stand 8 and the take-up reel stand 10, which are freely rotatably fitted into the cassette 12 and the take-up reel hub (not shown) in the cassette 12, respectively. It has a structure that engages and rotates as a unit.

A magnetic tape 18 wound on a supply reel hub (not shown) is inserted into a pair of notches 2 provided at the front of the cassette 12.
The take-up reel hub (
(not shown).

Inside the pair of notches 20 and 22 are guide posts 24 for pulling out and guiding two magnetic tapes each.
．． 26 and 28.30 are arranged. This guide post 24, 26 is implanted on a first drawer block 36 that slides while being guided by a first groove 34 on the base plate 2,
Similarly, guide post) 28.30 is the second groove 3 on the substrate 2.
8 and is placed on the second drawer block 4o which slides.

Figures 1 to 3 show the positional relationship in a stopped mode, and a pair of shafts 104°105 are installed on the back side of the board 2, and a tenth gear 106 is rotatably attached to the shaft 104. It is loosely fitted. In addition, a 20th deng gear 107 is rotatably loosely fitted onto the shaft 106, but the 10th
The - dewing gear 106 and the 20th - deng gear 107 do not have a direct meshing relationship, but are designed so that they can rotate independently of each other. As shown in FIG. 7, a spring hook 111 and a spring hook 111 provided on the tenth denging arm 11o, which are integrated with the boss 109 which enters the boss portion 108 of the tenth denging gear 106 and is rotatably fitted therein, and rotate together with the boss 109, A tension spring 113 is stretched between the pin 112 set on the 10th dewing gear 106, and the 10th deng arm 110
By bringing the stopper 114 and the pin 112 into contact with each other, the 10th dewing arm 11o and the 10th deng gear 106 are integrated and rotated together. 10th - One end of the ding arm 110 has a pin/1
16, a tenth connecting link 116 is rotatably coupled to the tenth connecting link 116. 10th - Deing link 1
The other end of the pin 116 is in a mating relationship with a pin 117 set on the first drawer block 36. 118 is the 20th dewing arm, but the 20th deg gear 107 is the 10th deg arm.
The structure is the same as that between the ding arm 11o and the 10th ding gear 106, and the 20th ding gear 10
The spring hook 122 provided on the 20th dewing arm 118 that is integrated with the boss 121 that enters the boss portion 120 of No. 7 and is rotatably fitted loosely and rotates together with the pin 123 that is installed on the 20th deng gear 107. tension spring 1 between
24 is stretched, and the stopper 126 provided on the 20th ding arm 118 and the pin 123 are brought into contact with each other, so that the 20th ding arm 118 and the 20th ding gear 107 are integrated and rotated together. It is.

A 20th drawing link 126 is rotatably coupled to one end of the 20th drawing arm 118 by a pin 119. The other end of the 20th drawing link 126 is connected to a pin 127 installed in the second drawer block 4o.
There is a bonding relationship with

Now, the swinging rod 12 driven by the motor 1o1
9 has a first gear part 130 that meshes with the tenth deng gear 106 and a second gear part 131 that meshes with the twentieth deng gear 107.
1. Guide grooves 132, 133 and 134 are provided which pass through the shafts 4 and 105 and are guided by shafts 100, 104 and 105 to swing around the point A shown in FIG.

That is, the swinging rod 129 is guided by the shafts 100, 104, and 105 and is supported so as to be able to swing freely about the point 1, while the swinging rod 129 is guided by the shafts 100, 104, and 105.
The gear center of the first gear part 130 meshing with the 20th-
Since the gear center of the second gear portion 131 that meshes with the dewing gear 107 is also aligned with the point, the swing rod 129
10th deinking gear 106 and 20th deinking gear 107'z smoothly
It can be rotated.

When the device is stopped, the positional relationship is as shown in FIG. 1, and when the motor 101 rotates counterclockwise in FIG.
Since the swinging rod 129 is guided by the shafts 104 and 106 and begins to swing clockwise in FIGS. 10th gear 106 meshing with
The 20th gear 107 meshing with the second gear portion 131 begins to rotate clockwise in FIG. 1 about the shaft 106 , and the 20th gear 107 meshing with the second gear portion 131 begins to rotate clockwise in FIG. 1 about the shaft 106 . This causes the 10th drawing arm 110 to rotate counterclockwise in FIG. 1 and the 20th drawing arm 118 to rotate clockwise, resulting in the first drawer block 36. The second drawer block 4° moves in the direction of arrow B in FIG. 1 along the guide grooves 34 and 3B, and draws the magnetic tape 18 out of the cassette 12. Subsequently, when the motor 101 rotates counterclockwise in FIG.
- the drawing arm 118 moves the first drawer block 36 and the second drawer block 4o to the position where the guide bosses) 24, 30 respectively abut the fixing members 135 and 136; Further, when the motor 101 rotates counterclockwise in FIG. 1 and the swing rod 129 comes to the position shown in FIG. 4,
A switch (not shown) is turned off and the rotation of the motor 101 is stopped. In this state, as mentioned above,
Since the tape guides 24 and 30 are in contact with the fixing members 136 and 136, the 10th and 20th decking arms 110 and 20.
- The ding arm 118 cannot rotate beyond the state shown in FIG. 4, and as a result, the 10th to 20th ding gears
- The dewing gear 107 is stretched against the biasing force of the tension springs 113 and 124i, resulting in the positional relationship shown in FIG. 6, and the state shown in FIG. It looks like it will be.

As mentioned above, the tenth-ding arm 11o.

Since the 10th dewing gear 106 and the 20th deg gear rotated counterclockwise and clockwise in FIG. A gap of ΔE is created, and similarly a gap of ΔE' is created between the pin 123 and the stopper 125. After all, these gaps ΔE and Δj' are nothing but the elongation of the tension springs 113, 124, and the guide posts 24, 30 are moved by the force corresponding to this elongation into the fixing member 13Ei.
, 136 to stabilize the magnetic tape 18, the fixed head 138° 139 is placed outside the cassette 12.
The guide drum 140 is attached to a guide drum 140 having a rotating magnetic head (not shown) built therein.

A capstan 143 rotatably disposed on the substrate 2 is rotated clockwise in FIG. 3 by a capstan motor 144.

The pinch roller 94 is in the position shown in FIG. 3 in the stopped mode, and moves to the position shown in FIG. is transferred to the take-up reel hub (
(not shown).

The operation of the magnetic tape device configured as described above will be explained.

When the record/playback switch (not shown) is pressed from the stop mode shown in FIG. 1, the capstan motor 144 rotates to rotate the capstan 143 clockwise in FIG. 3. Also, the motor 101 begins to rotate counterclockwise in FIG.
5 and guide grooves 132, 133, 134, the first gear part 1 swings clockwise in FIG.
30 to rotate the 10th deng gear 106 counterclockwise in FIG. Therefore, the 10th
- The drawing arm 11o is connected to the first
The 10th ding arm 1 rotates counterclockwise in the figure and connects the 10th ding arm 1 through the bin 116 and the 10th ding link 116.
The first drawer block 36 connected to the first
Since the guide posts 1-24 and 26 also move in the direction of arrow B, the magnetic tape 1
8 to the outside of the cassette 12. Similarly, the 20th
- the drawing arm 118 is connected to the first
The 20th-dewing arm 11 is rotated clockwise in the figure, and the 20th-dewing arm 11 is rotated clockwise in the figure, and
8 moves in the direction of arrow B along the second groove 38, the guide post 28°3o also moves in the direction of arrow B, pulling the magnetic tape 18 out of the cassette 12. Pull it out. In addition, since the 10th deng gear 106 and the 20th deng gear 107 are each meshed with the swing rod, the number of times the ζ gears are engaged with each other is one, which is small, and the number of times is the same, so backlash is reduced. Therefore, there is no relative variation in the amount of movement of the first drawer block 36 and the second drawer block 4o, and the error in the absolute amount of movement is also small.

When the motor 101 further rotates, a tape draw-out completion switch (not shown) is turned off, power supply to the motor 101 is cut off, and the positional relationship shown in FIG. 4 is maintained. Also,
The pinch roller 94 moves from the position shown in FIG. 3 to the position shown in FIG. (not shown) is wound up without slack by well-known means. In this way, the magnetic tape 18 is attached to the guide drum 140.
and fixed heads 138 and 139, and signals are recorded or reproduced.

Next, when a stop switch (not shown) is pressed, the power to the capstan motor 144 is cut off, the capstan 143 stops, and the pinch roller 94 returns to the position shown in FIG. 3 by known means. . The motor 101 rotates clockwise in FIG. 4, reversing the operation described above and returning the guide posts 24, 26 and 2B, 30 to the position shown in FIG. At this time, the magnetic tape 18 that had been pulled out is housed in the cassette 12 without slack by well-known means, a switch (not shown) is operated, and the motor 10
1 is stopped, resulting in the stopped state shown in FIG.

Further, as an example of the swing rod 192, it is assumed that the swing rod 192 moves back and forth in a straight line, and the first gear part 13o and the second gear part 131
What is the relationship between the 10th deing gear 106 and the 20th deing gear 107? It may also be constructed using a rack and a binion.

Further, in the above description, the shafts 100, 104, 105 were used to guide the movement of the swing rod 129, but these shafts 104, 10S also serve to support other members. This helps reduce the number of parts.

Effects of the Invention As described above, the present invention is capable of rotating the first drawer block in one direction from the first position of the magnetic tape drawer to the second position where the magnetic tape is drawn out of the cassette and attached to the magnetic tape. a tenth deng gear to drive;
The 2nd gear rotates in the opposite direction to the 10th - ding gear.
A 20th drawing gear that drives the drawer block from the first position to the second position engages with the 10th drawing gear and the 20th drawing gear to reciprocate, thereby reciprocating the 10th drawing gear. By providing a rocking rod that rotates the gear and the 20th dewing gear in forward and reverse directions in mutually different directions, the two drawer drive members only need to be connected to the drive source once, so it is easy to use a pack rack or the like. This also has the effect of reducing errors in the amount of movement of the magnetic tape pull-out member.

[Brief explanation of drawings]

FIG. 1 is a back view of a magnetic tape device in an embodiment of the present invention in a stopped state, FIG. 2 is a back view of essential parts in a stopped state, FIG. 3 is a top view in a stopped state, and FIG. 4 is a top view of a magnetic tape device in a stopped state. record/
Figure 5 is the back view of the main parts in the recording/reproducing mode, Figure 6 is the top view in the recording/reproducing mode,
7 is a perspective view of the main part of the same embodiment, FIG. 8 is a sectional view of the main part of the same embodiment, FIG. 9 is a top view of a conventional magnetic tape device, and FIG. 10 is a back view of FIG. 9. FIG. 11 is a lift curve diagram of a cam used in a conventional magnetic tape device. 2...Keyboard, 12...-Cassette, 18
...magnetic tape, 24, 26.28.30...
...Guide post, 36...First drawer block, 4o...Second drawer block, 1o1
...Motor, 106...10th deing gear, 107...20th deing gear,
129... Swinging rod, 130... First gear portion, 131... Second gear portion. Name of agent: Patent attorney Toshio Nakao and one other person No. 9
Figure 1θ Figure 111 Figure Force 4 rotation angle (/W n

Claims (2)

[Claims] (1) A magnetic method in which the magnetic tape is pulled out of the cassette from a cassette containing a pair of reel hubs for winding the magnetic tape, and is run along a magnetic head installed outside the cassette to record or reproduce signals. The tape device includes first and second tape devices that reciprocate between a first position for pulling out the magnetic tape in the cassette and a second position for pulling out the magnetic tape outside the cassette and attaching it to the magnetic head. a first drawer drive member that drives the first magnetic tape drawer member from the first position to the second position by rotation in one direction; and a first drawer drive member; are respectively engaged with a second drawer drive member that drives the second magnetic tape drawer member from the first position to the second position by rotation in the opposite direction, and with the first and second drawer drive members. a reciprocating member that rotates the first drawer drive member and the second drawer drive member forward and backward in mutually different directions by reciprocating together; Rotation in the other direction moves the first and second magnetic tape pull-out members from the first position to the second position, and rotation in the other direction moves the first and second magnetic tape pull-out members from the second position to the second position. 1. A magnetic tape device comprising: a motor capable of forward and reverse rotation for driving the magnetic tape device to one position. (2) The reciprocating member has third and fourth gear parts that mesh with first and second gear parts provided on the first and second drawer drive members, respectively, and 4. The magnetic tape device according to claim 1, wherein the magnetic tape device is configured to swing around the center of rotation of the gear portion No. 4.