JP3042172B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus in which an information detection switch moves to a position of an information display section of a tape cassette for a plurality of types of tape cassettes having different reel center positions.

[0002]

2. Description of the Related Art A home magnetic recording / reproducing apparatus (hereinafter referred to as VTR)
Depending on the application, in order to perform long-time recording or reproduction, a stationary VTR using a large tape cassette (hereinafter, referred to as a large cassette) having a large tape winding amount.
In addition, there are handy-type VTRs and video cameras using small tape cassettes (hereinafter referred to as small cassettes) which are small and lightweight and have a relatively small amount of tape wound. In this case, the two VTRs have different configurations such as the interval between the reel bases (reel shafts), so that the tape cassettes used for both have naturally different outer dimensions as well as between the reel shafts.

The configuration of a conventional VTR capable of selectively mounting tape cassettes having different external dimensions as described above will be described below with reference to the drawings. FIG. 20 shows a state in which a small cassette is mounted on a conventional VTR.
FIG. 20A is a plan view showing a mechanism for driving the reel base of the tape cassette and a mechanism for determining the position of the tape cassette. FIG. 20B is a front view showing a state where the small cassette is positioned on the chassis. is there. FIG. 21 shows a conventional VTR.
FIG. 21 shows a state in which a large cassette is mounted.
(A) is a plan view showing a mechanism for driving the reel base of the tape cassette and a mechanism for determining the position of the tape cassette;
FIG. 21B is a front view showing a state where the upper cassette chassis is positioned.

FIGS. 20 (a) and 20 (b) and FIG. 21 (a)
In (b), 1 is a small cassette, 2 is a large cassette, 101 is a chassis, 102 and 103 are positioning pins that are implanted in the chassis 101 and position the small cassette 1 and the large cassette 2, and 104 and 105 are small cassettes 1. Height regulating pins 106 and 107 for regulating the height from the chassis 101 of the large cassette 2
A height regulating pin for regulating the height from 01, 108 is a supply-side reel base mounted on a reel base 109, 11
Reference numeral 0 denotes a reel side on the winding side mounted on the reel base 111, 112 and 113 are reel guide receivers for fixing two guide rods 114 for guiding the reel base 109 to the chassis 101, and 115 and 116 are This is a reel guide receiver that fixes two guide rods 117 for guiding the reel base 111 to the chassis 101. The reel bases 109 and 111 each hold a reel motor (not shown), and the reel motors drive the reel base 108 so as to drive the rotation of the reel base.
And 110. Further, guide rods 114 and 117 held by the reel guide receivers penetrate through guide holes 118 and 119 provided at two locations on the reel bases 108 and 111, respectively. And 117 are slidable.

On the other hand, 120 is the reel base 10 described above.
And a worm 121 and a worm 121 with respect to the reel base 109.
And a gear 122 coaxial with the gear 122.
2 and a gear 123 that rotates together with the
26, the final gear 126 becomes the reel base 10
9 is engaged with a rack 127 fixedly attached to the rack 127. The worm 1 is attached to the reel base 111.
21, a gear 122 that meshes with the worm 121, and a gear 123 that is coaxial with the gear 122 and rotates integrally with the gear 122.
And the following gears 124 to 130 to form the final gear 13
0 meshes with a rack 131 fixedly attached to the reel base 111. Note that all of the gears listed above are rotatably held on shafts erected on the chassis 101.

Reference numeral 132 denotes an information detection switch for obtaining information such as the thickness and length of the magnetic tape from the tape cassette. According to the information on the magnetic tape, both the small cassette 1 and the large cassette 2 are provided with a small hole in the lower half of the cassette, or by closing the small hole, the information on the magnetic tape can be read by the detection terminal at the opposite position. . Since the position of the information display section of the tape cassette is defined so that the small cassette 1 and the large cassette 2 are common, the information detection switch 1 is used.
32 is fixedly provided on the chassis 101.

Hereinafter, the reel base 1 of the VTR having the above configuration will be described.
Operations of 08 and 110 will be described.

FIGS. 20A and 20B show the reel base 10.
8 and 110 show the state corresponding to the small cassette 1, and the operation from this state to the state corresponding to the large cassette 2 shown in FIGS. 21A and 21B will be described. In FIG. 20A, the rotation of the motor 120 is transmitted to the worm 121, and the rotation of the worm 121 is transmitted to the gear 122 meshing with the worm 121. Since the gear 122 rotates coaxially and integrally with the gear 123, the gear 124 meshing with the gear 123 rotates and the gear 1
The rotation of 24 drives the rack 127 by the gear 126 via the gear 125 and the gear 126a forming a gear train with respect to the supply reel base. At this time, the gear 126 is
When the motor 120 is rotating so as to rotate in the direction of the arrow R in (a), the reel base 109 moves in the direction of the reel guide receiver 113 and stops at the position shown in FIG. On the other hand, gear 1
24 is transmitted to the gear 128, and the gear 130 is transmitted through the gears 128, 129 and 130a constituting the gear train.
Drives the rack 131. When the gear 126 described above is rotating in the direction of arrow R in FIG. 20A, the gear 130 rotates in the direction of arrow S shown in FIG.
And stops at the position shown in FIG.

The case where the reel base 108 switches from the state corresponding to the small cassette 1 to the state corresponding to the large cassette 2 has been described above. When the reel base 108 is switched from the state corresponding to the small cassette 1 to the state corresponding to the large cassette 2, except that the rotation direction of the motor 120 is reversed, Operate.

The above description is mainly based on the reel base 10.
8, the operation has been described, but the reel stand 111 operates in exactly the same manner as the reel stand 108.

[0011]

However, in the above configuration, a switch (hereinafter referred to as an information detection switch) for detecting tape information such as the thickness and length of the magnetic tape contained in the tape cassette is a small cassette. The information detection switch is fixedly mounted because it is configured to be located at a common position for both the large cassette and the large cassette. However, if the information detection switch is arranged at the center of the tape cassette, this is not a problem in the case of a reel base directly connected to the reel motor as in the conventional example, but as generally employed, the reel is moved from the capstan drive motor to the reel. The mechanism for transmitting the torque for driving the rotation has design restrictions. In particular, in the case of a movie mechanism compatible with a small cassette, the position of the information detection switch is greatly restricted in design while achieving a reduction in size and weight as a whole.
Also, a dedicated motor is required to move the reel base.
The cost and the space occupied by the entire device
There was a problem in terms of molding.

The present invention is intended to solve the above-mentioned problem, and an information detection switch is provided for each of the information display sections which are different depending on the type of the tape cassette .
To realize a VTR that can be moved
This is the first purpose. Also, move the information detection switch
Realization of simple and low-cost means
This is the purpose of 2. Furthermore, the means for moving the reel base is simple and
A third object is to realize the method by a low cost method.

[0013]

According to a first aspect of the present invention , a supply reel and a take-up reel are provided.
Of the magnetic tape with different center positions
When multiple tape cassettes with different information display positions
A recording / reproducing device that can be selectively mounted, comprising an information display unit.
Select the information detection switch that engages with
Move to the position of the information display section of the selected tape cassette
Switch moving means. In addition, the present invention
In the second invention, the center positions of the supply reel and the take-up reel are different.
Information display showing information on different and included magnetic tapes
Selectively mount multiple tape cassettes with different locations
A possible recording / reproducing apparatus, comprising: a supply reel and a take-up reel.
A supply and take-up reel base that engages with the
Supply and take-up reel of the tape cassette selected for the
Reel base moving means for moving to the reel position, and reel base moving
A driving source for driving the means and an information display unit.
Information detection switch and the information detection switch
Switch to move to the position of the information display section of the tape cassette
Switch means for moving the switch by the drive source.
It is configured to drive a stage. In addition, the present invention
According to a third aspect of the present invention, the center position of the supply reel and the take-up reel
That can selectively mount multiple tape cassettes with different
Recording / playback device, engaging with supply reel and take-up reel
Supply and take-up reel base and supply and take-up reel base
At the supply and take-up reel position of the selected tape cassette
Reel base moving means to move and included in tape cassette
Tape loading means for extracting a magnetic tape to be
Drive source for driving tape loading means
The reel base moving means is driven by the drive source.
It is configured as follows. In addition, the fourth invention of the present invention
The position of the information display that shows the information on the magnetic tape
Recording cassette that can selectively mount multiple tape cassettes
An information detection switch that engages with the information display unit.
Switch and the information detection switch of the selected tape cassette.
Switch moving means for moving to the position of the information display section;
Tape to pull out the magnetic tape contained in the tape cassette
Drive the loading means and the tape loading means
Drive source for the switch.
It is configured to drive the moving means.

[0014]

According to the first aspect, the information detection switch is
Move to the information display area of the selected tape cassette.
The type of each tape cassette
Types, contents, etc. can be detected. According to the second invention
For example, the reel unit moving means and the switch moving means
It can be driven by a power source, and a cheap configuration can be achieved.
come. According to the third invention, tape loading is performed.
Means and the reel base moving means are driven by the same drive source
And an inexpensive configuration can be achieved. And the fourth
According to the invention, tape loading means and switch movement
Inexpensive configuration that means can be driven by the same drive source
It can be.

[0015]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are plan views of main parts according to the present invention. 1 shows a state where the reel base corresponds to a small cassette, FIG. 2 shows a state intermediate between a state where the reel base corresponds to a small cassette and a state corresponding to a large cassette, and FIG. 3 shows a state where the reel base corresponds to a large cassette. The state is shown. FIG. 4 shows FIG.
11 is an enlarged plan view of a main part shown in FIG. 5, and FIGS. 5 to 10 are sectional views or perspective views showing details of each part. Further FIG.
1 to 13 are partial plan views of main parts for explaining the operation process of the first embodiment, FIG. 14 is an enlarged plan view of main parts shown in FIG. 1, and FIGS. FIG. 17 is a partial plan view of an essential part for explaining an operation process of the switch boat, and FIGS. 18 and 19 are plan views showing an example of tape loading.

In the embodiment of the present invention, 1 is a small cassette and 2 is a large cassette as in the prior art. In FIG. 1, reference numeral 3 denotes a chassis, and a motor 4 is mounted on the chassis 3 by a motor mount 5, and a worm 6 is coupled to an output shaft of the motor 4. The worm 6 meshes with the gear 7a, and a gear 7b coaxially and integrally formed with the gear 7a and supported by a shaft 8 implanted in the chassis 3 together with the gear 7a meshes with a gear 9a of the next stage. A gear 9b coaxially and integrally formed and supported by a shaft 10 implanted in the chassis 3 together with the gear 9a meshes with the cam gear 11, and the motor 4 drives the rotation of the cam gear 11. I have. A cam groove 12 is formed on the upper surface of the cam gear 11, and a copying pin 14 provided on the lower surface of the distal end of the slider 13 is engaged with the cam groove 12, and the copying pin 14 is rotated by the rotation of the cam gear 11. The slider 13 is operated while the slot 15 and another slot (not shown) are guided by the shaft 16 and a fixing pin (not shown). As shown in FIG. 7, an outer cam groove 17 and an inner cam groove 18 are formed on the back surface of the cam gear 11, and the outer cam groove 17 is formed.
And the inner cam groove 18 is partially connected. Further, a switching lever 20 is rotatably held by a support shaft 19 in a space where the outer cam groove 17 and the inner cam groove 18 of the cam gear 11 communicate with each other.
0a is formed to protrude downward.

As shown in FIG. 6, a biasing gear 21 is rotatably held at a lower portion of the cam gear 11 on a shaft 21c mounted on the chassis 3. Similarly, a biasing gear 21 is mounted on the chassis 3 at a lower portion of the cam gear 11. The two long holes 23 and 24 are guided by the shaft 16 and the guide pin 22, and a control lever 25 is provided so as to be able to move linearly. An outer cam formed on the cam gear 11 is provided on the upper surface of the control lever 25. A copying pin 26 that engages the groove 17 or the inner cam groove 18 is implanted. Further, a rack portion 25 a provided at one end of the control lever 25 has a fan-shaped portion 2 formed on the urging gear 21.
1a, and a rack 25b provided at the other end of the control lever 25 is engaged with the switch arm gear 27 as shown in FIGS.
Is fixed so as to rotate integrally with the switch lever arm 28 and is rotatable about a rotation shaft 29. The switch lever arm 28 is provided with a torsion spring 30 whose winding portion is held by a rotating shaft 29 and whose distal end is formed of two parallel linear portions. A spring locking portion provided on the switch lever arm 28 is provided. Since the torsion spring 30 is engaged with and constrained by the torsion spring 31, the torsion spring 30 is
It rotates in conjunction with the rotation of 8. Reference numeral 32 denotes a switch boat equipped with a plurality of switches 32a for detecting tape information from an information display unit that shows information on a magnetic tape (not shown). Two copy pins 33a and 33b provided at the bottom of the switch boat 32 are provided. The switch boat 3 is fitted in the slit 35 formed in the guide member 34.
2 is movable along the slit 35. The two straight portions of the torsion spring 30 are three of the two copying pins 33a and 33b provided on the bottom of the switch boat 32.
3a, the switch boat 32 moves along the slit 35 as the switch lever arm 28 rotates. On the other hand, the guide pin 36 implanted on the bottom surface of the switch lever arm 28 is
And the other end of the reel shaft switching lever 37 is opened in the chassis direction.
A reel in which a U-shaped groove 39 is formed and which is bridged so as to fit into a U-shaped groove 41 formed in a left reel base moving member 40 and a U-shaped groove 43 formed in a right reel base moving member 42. A substantially central portion of the base urging spring 44 is sandwiched from above by the U-shaped groove 39, and the reel base urging spring 44 is held at three points. The reel shaft switching lever 37
Is rotatable about a shaft 45 implanted in the chassis 3.

Hereinafter, the structure will be described with reference to FIG. 2 in order to prevent the drawing from becoming complicated. FIG. 2 is the same as FIG. 1 and FIG. 3 except for the state. In FIG.
Is a gear for driving the rotation of the reel base and is driven by a motor different from the motor 4. A gear 47 is coaxially and integrally formed with the gear 46 and is rotatably supported by a shaft 48 implanted in the chassis 3. A gear 49 meshes with the gear 47. A left reel 50 depends on the rotation direction of the gear 47. The gear 49 is rotated around the shaft 48 toward the drive gear 51 or the right reel drive gear 52, and the gear 49 is moved to either the left reel drive gear 51 or the right reel drive gear 52.
Is a supply-side reel table that meshes with the left reel drive gear 51 and rotates around a shaft 54 erected on the chassis 3 by the reel table moving member 40, and 55 is a right-side reel table. A take-up reel base that meshes with the reel drive gear 52 and rotates about a shaft 45 erected on the chassis 3 by the reel base moving member 42, and 56 is a reel side when the reel base moving member 40 rotates. A reel base stopper for determining a stop position, 57 is a stopper block for determining a position where the reel base moving member 40 corresponds to the large cassette 2, and 58 is a stopper block for determining a position where the reel base moving member 40 corresponds to the small cassette 1. The stopper block 59 is a reel stand stopper for determining a stop position when the reel stand moving member 42 rotates, and the switch boat 32 is a small cassette. Also it serves as a stopper switch boat 32 when corresponding to 1. 60 is a reel base moving member 4
2 is a stopper block for determining a position corresponding to the large cassette 2; 61 is a stopper block for determining a position of the reel base moving member 42 corresponding to the small cassette 1; 62 is a switch boat 32 corresponding to the large cassette 2; The stopper 63, 64 when moved to the position is a height regulating pin for regulating the height of the large cassette 2, 6
Reference numerals 5 and 66 denote positioning pins for restricting the position of the large cassette 2, 67 and 68 denote positioning pins for restricting the position of the small cassette 1, and 69 denotes a positioning pin mounting plate. In order to control the height of the small cassette 1, the rotation shaft 54 of the left reel base moving member and the rotation shaft 45 of the right reel base moving member are used.

In FIGS. 18 and 19, reference numeral 70 denotes a magnetic tape; 71a, an opening of the small cassette 1; 71b, an opening of the large cassette 2; 72, a magnetic tape 70 drawn out from the opening 71a or 71b; A plurality of guide posts, a cylinder provided with a magnetic head for contacting the magnetic tape 70 to perform recording and reproduction, a capstan 74 for giving the magnetic tape 70 a constant running speed, Is a pinch roller for pinching the magnetic tape 70 between the capstan 74 and the capstan 74.

The information display section 1b of the small cassette 1 for displaying the thickness, length and erroneous erasure prevention of the magnetic tape 70 is provided at the lower right corner of the take-up reel 1a. This position is the most suitable position in designing the movie mechanism to avoid interference with others. Similarly, in the large cassette 2, the information display section 2b is provided at the lower right corner of the take-up reel 2a. The magnetic tape 70 for the small cassette 1 and the large cassette 2
Take-up reel 1a or 2a
And the information display unit 1b or 2b has a different positional relationship, and the information detecting switch 32a is connected to the reel base (not shown) or the chassis regardless of the configuration of the moving means for the reel stands 53 and 54. 3 cannot be fixedly provided. Therefore, a switch moving means is required separately from the reel stand movement.

The operation of the VTR according to the present invention configured as described above will be described first from the operation of switching the position of the reel base. In the operation of switching the position of the reel base, the type of the tape cassette mounted on the VTR is detected by cassette type detection means (not shown), and the position of the reel base is adapted to the type of the mounted tape cassette. It is done when there is no.

As described above, the rotation of the motor 4 drives the cam gear 11 to rotate. The operation of the cam gear 11 and the reel base will be described. First, FIG. 5 shows a cross section taken along line A-O ₁ -O ₂ -O ₃ -A in FIG. A worm 6 is connected to the output shaft of the motor 4, and the gear 9 b meshes with the outer periphery of the cam gear 11 via the gears 7 a, 7 b, 9 a from the worm 6 to rotate the cam gear 11. The upper and lower surfaces of the cam gear 11 are provided with cam grooves having different shapes, respectively.
8, a copying pin 26 implanted in a control lever 25 is engaged. The copying pin 26 is guided by the cam groove 18 or 19 with the rotation of the cam gear 11, and The long holes 23 and 24 formed are guided by the shaft 16 and the guide pin 22 to control the control lever 25.
Moves.

FIG. 4 is an enlarged plan view of a main part, and FIG. 9 is a sectional view taken along a line BB and a line CC shown in FIG. The reel shaft switching lever 37, which is a component commonly related to the cross section along the line C, is indicated by a two-dot chain line. That is, the switch arm gear 27 is configured as shown in FIGS.
As shown in FIG. 3, the switch arm gear 27 is driven by a rack 25 b formed on the control lever 25 to rotate at a fixed angle about a rotation shaft 29, but the switch arm gear 27 rotates integrally with the switch arm lever 28. A guide pin 36 is provided below the switch arm lever 28, and the guide pin 36 is engaged with the elongated hole 38 of the reel shaft switching lever 37, so that the switch arm gear 27 rotates. Then, the reel shaft switching lever 37 rotates in conjunction therewith. FIG. 10 is a cross-sectional view taken along the line DD shown in FIG. In FIG. 10, the reel base moving members 40 and 4
A reel stand urging spring 44 is fitted so as to bridge both of the U-shaped grooves 41 and 43 formed in a part of the two, and the reel stand urging spring 44 held in the two U-shaped grooves 41 and 43 is provided. The U-shaped groove 39 formed in the reel shaft switching lever 37 abuts the intermediate portion of the reel shaft from above, and holds the reel base urging spring 44 at three points.

The operations of the reel shaft switching lever 37 and the reel base moving members 40 and 43 engaged by the reel base urging spring 44 as described above are shown in FIGS.
This will be described with reference to FIG. FIGS. 11A to 11C show only the components necessary for the description, and omits components not related to the operation. First, FIG. 11A shows a state in which the reel shaft switching lever 37 has rotated to the maximum counterclockwise with the shaft 45 as a fulcrum. In this state, since the U-shaped groove 39 formed at one end of the reel shaft switching lever 37 urges the reel base urging spring 44 in the direction of arrow E, the left reel base moving member 40 The fulcrum is urged clockwise, and the right reel base moving member 42 is urged counterclockwise about the shaft 45 as a fulcrum. At this time, the reel base support shaft 40
a and 42a are minimized, and the reel base moving member 40
And 42 correspond to the small cassette 1.
FIG. 11B shows a state in which the reel axis switching lever 37 is in the neutral position, and includes a U-shaped groove 41 formed in the left reel base moving member 40 and a right reel base moving member 4.
2 and the U-shaped groove 39 formed on the reel shaft switching lever 37 are aligned in a straight line, and the reel base urging spring 44 is moved to the U-side of the left reel base moving member 40. Since no urging force is applied to the U-shaped groove 41 and the U-shaped groove 43 of the right reel base moving member 42, the interval between the reel base support shafts 40a and 42a is stopped at an intermediate distance. Next, FIG. 11C shows a state in which the reel shaft switching lever 37 is rotated clockwise to the maximum with the shaft 45 as a fulcrum. Since the biasing spring 44 is biased in the direction of arrow F, the left reel base moving member 40 is biased counterclockwise about the shaft 54 as a fulcrum, and the right reel base moving member 42 is clocked about the shaft 45 as a fulcrum. Biased in the direction. At this time, the interval between the reel base support shafts 40a and 42a becomes maximum, and the reel base moving members 40 and 42 are in a state corresponding to the large cassette 2.

Next, the reel shaft switching lever 37 is moved to the position shown in FIG.
The principle of controlling to the state shown in (a), (b) and (c) will be described. As shown in FIGS. 1 to 3 and 9, the guide pin 36 implanted below the switch arm lever 28 is engaged with the elongated hole 38 of the reel shaft switching lever 37, and the rotation of the switch arm lever 28 is performed. 11 (a) and 11 (b).
And the state shown in (c). Since the switch arm lever 28 is fixed integrally with the switch arm gear 27 and rotates about the rotation shaft 29, the operation of the reel shaft switching lever 37 will be described in relation to the operation of the switch arm gear 27 and the rotation of the cam gear 11. I do.

First, the process of shifting the switch arm gear 27 from the state corresponding to the small cassette 1 to the state corresponding to the large cassette 2 will be described with reference to FIGS. FIGS. 12A to 12E show the relationship between the positional relationship and the posture of the urging gear 21, the switching lever 20, the control lever 25, the copying pin 26 provided on the control lever 25, and the switch arm gear 27. Outer cam grooves 17 formed on the lower surface of the cam gear 11 for these components
The shape and positional relationship of the inner cam groove 18 are indicated by a two-dot chain line.

FIG. 12A shows a state where the switch arm gear 27 is stopped in a posture corresponding to the small cassette 1. In this state, the control lever 25 is in a state of protruding outward from the cam gear 11, and the copying pin 26 is located between the outer wall of the outer cam groove 17 and the switching lever 20. At this time, a shaft 16 which is a center of rotation of the cam gear 11,
The support shaft 19 serving as the center of rotation of the switching lever 20 and the copying pin 26 implanted in the control lever 25 are substantially in a straight line, and the distance between the copying pin 26 and the shaft 16 is equal to the outer cam groove 1.
7 (the outer cam groove 17 and the inner cam groove 18)
Are equal to the radius of a part forming a concentric circle). Further, the switch arm gear 27 is in a position substantially perpendicular to the control lever 25, and when the switch arm gear 27 is in this position, the state of FIG. 11A can be realized. When the cam gear 11 rotates clockwise from this state, the copying pin 26 is interposed between the outer wall of the outer cam groove 17 and the switching lever 20 and the outer cam groove 17 and the inner cam groove 18 communicate with each other. 17a (hereinafter simply referred to as groove end 17a)
Approach. FIG. 12B shows this state. In this state, since the distance between the copying pin 26 and the shaft 16 that is the center of rotation of the cam gear 11 is small, the control lever 25 on which the copying pin 26 is implanted moves in the direction of arrow G. As shown in FIG. 6, the control lever 25 and the urging gear 21 have a rack 25a of the control lever 25 meshed with a fan-shaped gear 21a of the urging gear 21, and the control lever 25 moves in the direction of arrow G. Then, the urging gear 21 rotates counterclockwise about the shaft 21c erected on the chassis 3 as a fulcrum.
The columnar projection 20a of the switching lever 20 rotatably attached to the lower surface of the cam gear 11 is an elastic projection projecting from the urging gear 21 when the cam gear 11 rotates to the state shown in FIG. Enter the area that interferes with 21b,
In addition, since the urging gear 21 rotates counterclockwise about the shaft 21c, the elastic protrusion 21b rotates inward and abuts the columnar projection 20a provided on the switching lever 20 from the outside, and the columnar projection 21a is rotated. The projection 20a is urged inward. Therefore,
The switching lever 20 is urged clockwise with the support shaft 19 shown in FIG. 7 as a fulcrum, and the copying pin 26 is sandwiched between the switching lever 20 and the outer wall of the outer cam groove 17. On the other hand, the switch arm gear 27 is also the rack 2 of the control lever 25.
5b, the switch arm gear 27 moves in the direction of the arrow G to cause the switch arm gear 27 to rotate.
It rotates counterclockwise around 9 as a fulcrum. FIG. 12C shows a state in which the cam gear 11 further rotates clockwise, the copying pin 26 comes out from between the switching lever 20 and the outer wall of the outer cam groove 17 and reaches the end 17a of the groove. . In this state, the motor 4 is temporarily stopped, and the rotation of the cam gear 11 is stopped. At this time, the switching lever 20 is
By the urging force of 1b, the switch lever 20 is rotated clockwise about the support shaft 19, and one end of the switching lever 20 opposite to the end provided with the columnar projection 20a contacts the outer wall of the outer cam groove 17. As a result, a path for the copying pin 26 is formed between the groove end 17a and the inner cam groove 18. In this state,
The switch arm gear 27 is at an angle of approximately 45 degrees with the control lever 25. Switch arm gear 27 at this time
The posture of the reel shaft switching lever 37 is shown in FIG.
It corresponds to the state of.

Next, the cam gear 11 is rotated counterclockwise by reversing the rotation of the motor 4. Figure 1 shows the state in the middle.
This is shown in FIG. Since the path of the scanning pin 26 is formed between the terminal end 17a of the groove and the inner cam groove 18, the scanning pin 26 is rotated with the switching lever 20 and the inner cam as the cam gear 11 rotates counterclockwise. In order to enter between the inner wall of the groove 18 and the shaft 16 at the center of rotation of the cam gear 11,
Is further reduced, the control lever 25 moves in the direction of arrow G again, and accordingly, the switch arm gear 2
7 further rotates counterclockwise. When the operation of the motor 4 is continued and the cam gear 11 is rotated in the counterclockwise direction, the copying pin 26 enters the inner groove 18, and the interval between the rotation center shaft 16 of the cam gear 11 and the copying pin 26 is reduced to the inner groove. When the motor reaches an area equal to the radius of the constant radius portion of the motor 18, the motor 4
And the rotation of the cam gear 11 is stopped. In this state, the shaft 16 serving as the center of rotation of the cam gear 11, the support shaft 19 serving as the center of rotation of the switching lever 20, and the copying pin 26 implanted in the control lever 25 are substantially straight. Also,
The engagement between the elastic projection 21b of the urging gear 21 and the columnar projection 20a provided on the switching lever 20 is released, and the switching lever 20 becomes freely rotatable. At this time, switch arm gear 2
7 is substantially parallel to the control lever 25, and the attitude of the switch arm gear 27 corresponds to the state shown in FIG.

As described above, the cam gear 11 is initially turned clockwise at a constant angle, that is, the copying pin 26 is moved to the end 17 of the groove.
a, the rotation of the cam gear 11 is temporarily stopped, and then the cam gear 11 is rotated counterclockwise by the angle initially rotated clockwise, so that the reel base corresponds to the small cassette 1. Cassette 2 from the position
Can be moved to the position corresponding to.

Next, the process of shifting the switch arm gear 27 from the state corresponding to the large cassette 2 to the state corresponding to the small cassette 1 will be described with reference to FIGS.

First, FIG. 13A shows the same state as FIG. 12E. That is, the switch arm gear 27 is in a posture substantially parallel to the control lever 25, and the left and right reel base moving members correspond to the large cassette 2, as shown in FIG. In this state, in FIG. 13A, the copying pin 26 is located between the switching lever 20 in a freely rotatable state and the inner wall of the inner cam groove 18. When the cam gear 11 is rotated clockwise from this state, the state shown in FIG. That is,
Since the copying pin 26 is guided by the inner cam groove 18 and the interval between the shaft 16 which is the center of rotation of the cam gear 11 and the guide pin increases, the control lever 25 moves in the direction of arrow H.
On the other hand, the switching lever 20 rotates clockwise about the shaft 16 together with the cam gear 11, so that the columnar projection 20 a of the switching lever 20 enters a region where the elastic projection 21 b of the biasing gear 21 interferes. In addition, when the control lever 25 moves in the direction of the arrow H, the urging gear 21 rotates clockwise about the shaft 21c, so that the elastic protrusion 21b of the urging gear 21 is moved to the columnar projection 20a of the switching lever 20. Abutment, columnar projection 20
a is urged outward. As a result, the switching lever 20 is urged counterclockwise about the support shaft 19,
The scanning pin 26 is sandwiched between the cam pin 18 and the inner wall of the inner cam groove 18. The switch arm gear 27 moves the rack 2 of the control lever 25 in accordance with the movement of the control lever 25 in the direction of arrow H.
5b to rotate clockwise about the rotation shaft 29 as a fulcrum.

FIG. 13C shows a state in which the cam gear 11 is further rotated clockwise, the copying pin 26 reaches the end 17a of the groove, and the rotation of the cam gear 11 is temporarily stopped. In this state, the copying pin 26 is
0 and one end of the switching lever 20 opposite to the end on which the columnar projection 21a is provided, comes into contact with the inner wall of the inner cam groove 18 so as to escape from between the inner cam groove 18 and the inner wall of the inner cam groove 18. A path for the copying pin 26 is formed between the cam pin 17 and the outer cam groove 17. During this time, the switch arm gear 27 further rotates clockwise, so that the switch arm gear 27 is at an angle of approximately 45 degrees with the control lever 25. The postures of the switch arm gear 27 and the reel shaft switching lever 37 at this time correspond to the state shown in FIG.

Next, the cam gear 11 is rotated counterclockwise by reversing the rotation of the motor 4. Figure 1 shows the state in the middle.
This is shown in FIG. Since the path of the copying pin 26 is formed between the terminal end 17a of the groove and the outer cam groove 17, the copying pin 26 is connected to the switching lever 20 and the outer cam as the cam gear 11 rotates counterclockwise. The shaft 16 at the center of rotation of the cam gear 11 and the copying pin 26
Is further increased, the control lever 25 moves in the direction of arrow H, and the switch arm gear 27 further rotates clockwise. When the operation of the motor 4 is continued and the cam gear 11 is rotated counterclockwise, the copying pin 26
Enters the outer groove 17 and the shaft 1 at the center of rotation of the cam gear 11
When the space between the scanning groove 6 and the copying pin 26 reaches a region where the radius of the constant radius portion of the outer groove 17 is equal to the radius, the motor 4 is stopped and the rotation of the cam gear 11 is stopped. In this state, the shaft 16 serving as the center of rotation of the cam gear 11, the support shaft 19 serving as the center of rotation of the switching lever 20, and the copying pin 26 implanted in the control lever 25 are substantially aligned. Further, the engagement between the elastic projection 21b of the urging gear 21 and the columnar projection 20a provided on the switching lever 20 is released, and the switching lever 20 becomes freely rotatable. At this time, the switch arm gear 27 is substantially perpendicular to the control lever 25, and the attitude of the control lever 25 corresponds to the state shown in FIG.

The operation of the stopper at the operating end of the reel base moving member 42 shown in FIG. 15 will be described. FIG. 15 is a sectional view taken along the line D-O-D in FIG. 14 and shows the vicinity of the reel stand moving member 42 and the reel stand stopper 59 on the right side. In FIG. 15, when the right reel base 55 is rotatably attached to the support shaft 42a implanted in the right reel base moving member 42, and the reel base moving member 42 rotates clockwise or counterclockwise, the reel Table moving member 42
Slides on the upper surface of the reel base stopper 59.
Stopper blocks 60 and 61 are provided at both ends of the reel base stopper 59, and the reel base moving member 4 is provided.
When the reel base moving member 42 is at the position corresponding to the large cassette 2, the distal end of the reel base moving member 42 contacts the stopper block 60 to determine the position. The tip of the table moving member 42 comes into contact with the stopper block 61 and the position is determined. As described with reference to FIG. 11, the reel base moving member 42 is urged by the reel base urging spring 44, so that the leading end of the reel base moving member 42 comes into contact with the stopper block 61 with a constant pressing force. . The positioning of the right reel base moving member 42 has been described above, but the positioning of the left reel base moving member 40 is similarly performed.

The operation of the switch boat 32 equipped with the switch 32a for detecting cassette information shown in FIG. 16 will be described with reference to FIGS. FIG. 16B shows the spring locking portion 31 as shown in FIG.
16A is a view as seen from the direction of arrow I, and the torsion spring 30 whose winding part is held by the rotating shaft 29 shown in FIG.
After intersecting once, the spring engaging portion 31 is engaged so as to sandwich the spring engaging portion from both sides, is supported by the spring engaging portion 31, and further extends to form two parallel straight portions having two distal ends. Are parallel to each other and sandwich the copying pin 33a. As described with reference to FIG. 11, the switch arm gear 27 rotates with the rotation of the cam gear 11, and the switch arm lever 2 rotates with the rotation of the switch arm gear 27.
8 rotates, and the switch arm lever 28 is
1 is provided, the switch arm lever 28 rotates with the rotation of the cam gear 11, and FIG.
As shown in (b), the torsion spring 30 rotates around the rotation shaft 29, and as a result, the switch boat 32 moves along the slit 35 provided in the guide member 34.

In the state where the reel base moving members 40 and 42 correspond to the small cassette 1 as shown in FIGS. 1 and 11A, the switch boat 32 is switched as shown in FIG. Spring locking portion 31 of lever 28
The torsion spring 30, which is supported by the switch lever arm 28 and rotates with the rotation of the switch lever arm 28, urges the copying pin 33a provided at the bottom of the switch boat 32, and the switch boat 32 twists to the right reel stand stopper 59. Spring 3
It is stopped by being pressed by the elastic force of 0. When the motor 4 is rotated to switch the reel base moving members 40 and 42 to the large cassette 2 from this state, the switch arm lever 28 rotates counterclockwise, and once the state shown in FIG.
Stop in the state shown in. FIG. 17B shows a state of the switch boat 32 when the reel base moving members 40 and 42 are in the states of FIGS. 2 and 11B. This is a state where the motor 4 is stopped, and the switch boat 32 is stopped without receiving any urging force.

As described with reference to FIG. 12, when the motor 4 is rotated in the reverse direction, the switch arm lever 28 rotates clockwise again, and the switch arm lever 28 shown in FIG. Stop at the clockwise end of rotation. FIG. 17C shows a state of the switch boat 32 when the reel base moving members 40 and 42 are in the states of FIGS. 3 and 11C. That is, the reel base moving members 40 and 42 are in a state corresponding to the large cassette 2, and the switch boat 32 is stopped by being pressed by the stopper 62 by the elastic force of the torsion spring 30.

Next, the reel base moving members 40 and 42
17 is changed from the state corresponding to the large cassette 2 to the state corresponding to the small cassette 1, by controlling the cam gear 11 in the order described with reference to FIG. 13, the process shown in FIG. The position of the switch boat 32 is moved in the order of c) → (b) → (a).

The operation of the slider 13 will be described. As shown in FIGS. 1 to 3, the copying pin 14 implanted on the back surface of the slider 13 fits into a cam groove 12 formed on the surface of the cam gear 11. Cam gear 11 is reel base 53
In order to change the spacing between
When 3 and 55 move from the state corresponding to the small cassette 1 to the state corresponding to the large cassette 2, or when the reel bases 53 and 55 move from the state corresponding to the large cassette 2 to the state corresponding to the small cassette 1. In FIG. 2, the copying pin 14 is located between the positions shown in FIGS. 1 and 3 and the position shown in FIG. This range is such that the distance of the cam groove 12 from the shaft 16 is constant, that is, the cam groove 12 has a constant radius, and even if the cam gear 11 rotates, the slider 13 does not move and is in a non-operating state. The position is kept constant.

However, when the cam gear 11 rotates counterclockwise from the state shown in FIG. 1 or FIG.
Since the distance from the second shaft 16 gradually increases, the slider 13 moves rightward in FIG. 1 or FIG. 3 while the long hole 15 provided in the slider 13 is guided by the shaft 16. The operation of the slider 13 causes the plurality of guide posts 72 to expand, and the magnetic tape 70 in the opening 71 of the tape cassette is pulled out to form a predetermined traveling path, whereby the magnetic tape is loaded. Since the configuration for loading the magnetic tape by moving the slider 13 is known,
A detailed description of the operation is omitted.

When the cam gear 11 is rotated to perform the tape loading, the outer cam groove 17 or the inner cam groove 18 shown in FIGS.
In the copying pin 26 guided to the outside, the distance between the outer cam groove 17 or the inner cam groove 18 and the shaft 16 is within a certain range (the outer cam groove 17 and the inner cam groove 18 form a concentric circle). ), The control lever 25 does not move even if the cam gear 11 rotates, and its position is kept constant. Therefore, when tape loading is being performed, the reel bases 53 and 55 are in a non-operation state.

As described above, according to the present invention, the tape loading motor 4 is also used as a motor for rotating the reel moving members, and the operation of rotating the reel moving members 40 and 42 and the switch 32a for detecting information are performed. The magnetic recording / reproducing apparatus is configured such that the switch 32a for information detection can be shared by the small cassette 1 and the large cassette 2 by moving the switch 32a for information detection in conjunction with the movement of the switch boat 32 equipped with be able to.

[0044]

As is apparent from the above description, the present invention
According to this, the reel base moving means and the switch moving means are common
Driven by the drive motor of
And the information detection switch to the specified position
Tape cassette installed because it is configured as
Supply reel of the cassette and an information display section according to
And can be automatically moved to a position where it can be engaged with.
In addition, a common drive motor moves the reel base and the information detection switch.
This mechanism can be realized at low cost because
Wear.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a first embodiment of a magnetic recording / reproducing apparatus according to the present invention, which corresponds to a small cassette.

FIG. 2 is a plan view of a main part of the device in an intermediate state.

FIG. 3 is a plan view of a main part of the apparatus when a large cassette is supported.

FIG. 4 is an enlarged plan view of a main part of the device in an intermediate state.

FIG. 5 is a sectional view of a drive system of the apparatus.

FIG. 6 is a perspective view showing an engagement state of a control lever and an urging gear of the device.

FIG. 7 is a bottom perspective view showing the configuration of a cam gear of the apparatus.

FIG. 8 is a sectional view showing the vicinity of a cam gear of the device.

FIG. 9 is a sectional view of a main part of the apparatus.

FIG. 10 is a sectional view of another essential part of the device.

11A is a plan view of a main part of the apparatus in which a reel base corresponds to a small cassette; FIG. 11B is a plan view of a main part when the reel base of the apparatus is in an intermediate state; Main part plan view with the reel base of the device corresponding to a large cassette

12A is a plan view of a main part of the apparatus in which a cam gear corresponds to a small cassette. FIG. 12B is a plan view of a main part when the state of the cam gear of the apparatus is in an initial intermediate stage. The main part plan view when the state of the cam gear of the device is in the middle stage of the middle period is (d). The main part plan view when the state of the cam gear of the device is in the middle stage of the latter period. Main part plan view in the state corresponding to the cassette

13A is a plan view of a main part of the apparatus in which a cam gear corresponds to a large cassette. FIG. 13B is a plan view of a main part when the state of a cam gear of the apparatus is in an initial intermediate stage. The main part plan view when the state of the cam gear of the device is in the middle stage of the middle stage. (D) The main part plan view when the state of the cam gear of the device is in the middle stage of the latter period. Main part plan view in the state corresponding to the cassette

FIG. 14 is an enlarged plan view of a main part when the apparatus is compatible with a small cassette.

FIG. 15 is a sectional view taken along the line DOD in FIG. 14;

16A is a partial cross-sectional view of a switch boat moving unit of the device. FIG. 16B is an enlarged front view of a spring locking unit of the device.

17A is a plan view of a switch boat moving unit in a state where the switch boat corresponds to a small cassette. FIG. 17B is a plan view of the switch boat moving unit in a state where the switch boat is in an intermediate state. Top view of switch boat moving unit with boat corresponding to large cassette

FIG. 18 is a plan view showing an example of a tape loading state of the small cassette.

FIG. 19 is a plan view showing an example of a tape loading state of a large cassette.

FIG. 20 (a) is a plan view of a main part of a conventional magnetic recording / reproducing apparatus in a state where the apparatus is compatible with a small cassette;

21 (a) is a plan view of a main part of the apparatus in a state where the apparatus is compatible with a large cassette; FIG.

[Explanation of symbols]

 Reference Signs List 1 Small cassette (tape cassette) 2 Large cassette (tape cassette) 4 Motor (loading motor) 11 Cam gear (mode control means) 13 Slider (tape loading means) 20 Switching lever (mode control means) 25 Control lever (mode control means) 27 switch arm gear (switch moving means) 28 switch arm lever (switch moving means) 29 rotating shaft (switch moving means) 30 torsion spring (switch moving means) 32a switch (information detection switch) 32 switch boat (switch moving means) 34 Guide member (switch moving means) 35 Slit (switch moving means) 70 Magnetic tape

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 15/07 G11B 15/665 640

Claims (1)

(57) [Claims] 1. A recording / reproducing apparatus which can selectively mount a plurality of tape cassettes having different center positions of a supply reel and a take-up reel and different positions of an information display section indicating information of a magnetic tape included therein. , Attached tape cassette
Cassette type detecting means for detecting the type of
It can be engaged with the reel and take-up reel and moves between predetermined positions
A supply and take-up reel base supposedly supported;
A reel table moving means for moving the take-up reel table;
A resiliently urging the supply and take-up reel base to a predetermined position.
And a predetermined position capable of engaging with the information display section.
An information detection switch movably supported between positions;
Switch that moves the information detection switch to the selected position
H guides the movement of the information detection switch.
Said cassette detecting means.
Detects the type of cassette installed in the drive mode.
And the supply reel is supplied via the reel base moving means.
And take-up of the cassette with the reel stand
To the reel position, and
And the driving motor
Mounting the information detection switch through the switch moving means.
At a position where it can be engaged with the information display section of the attached cassette.
It is configured to move along the switch guide means.
And a magnetic recording / reproducing apparatus.