JPH09326146A - Cassette type recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the amount of relief when a small cassette guide is released to the lower side of a bottom plate of a cassette holder by a large tape cassette. SOLUTION: When the small cassette guide 39 is protruded to the upper side of the bottom plate 34a of the cassette holder 34, the small cassette guide 39 is made so as to keep an elevation angle θ1 , and when the small cassette guide 39 is released to the lower side of the bottom plate 34a by the large tape cassette, a leaf spring 40 is used for making the small cassette guide 39 change to have the attitude almost parallel with the bottom plate 34a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette type recording / reproducing apparatus suitable for application to a video tape recorder or the like capable of recording and reproducing while properly using plural kinds of tape cassettes having different sizes. It belongs to the technical field.

[0002]

2. Description of the Related Art The applicant of the present invention has proposed as an example of a prior application of a video tape recorder integrally incorporated in a video camera.
The prior application examples shown in FIGS. 8 to 19 are applied. In this prior application example, first, as shown in FIGS. 11 and 12, an opening 3 is formed on a side surface of an outer case 2 of a video camera body 1, and a video tape recorder is formed inside the opening 3 of the outer case 2. 4 is built vertically. The video tape recorder 4 is configured so that two types of tape cassettes, a large tape cassette 11 and a small tape cassette 12, can be selectively mounted and recorded and reproduced. As shown in FIGS. 13, 14, 17, and 18, these large and small tape cassettes 11,
The reference numeral 12 has a substantially similar shape, and a magnetic tape 14 wound around a pair of left and right tape reels 13 is housed inside. The magnetic tape 14 is the front end 11a, 12 of the large and small tape cassettes 11, 12.
A double-structured opening / closing structure that is bridged across the central opening 15 formed in the central portion on the a side in the left-right direction, and that opens and closes so as to wrap the magnetic tape 14 in the central opening 15 from the front and rear. A lid 16 is attached to these front ends 11a, 12a.

And, FIG. 11, FIG. 12, and FIG. 17 to FIG.
As shown in, the mechanical deck 21 of the video tape recorder 4 is formed vertically, and the mechanical deck 21 has a pair of left and right reel stands 22, positioning pins 23, a tape loading mechanism 24, a rotary head drum 25, and a left and right pair. The brake drum 26, the band brake 27, the soft brake 28, the one-way clutch 29, and other various recording and reproducing mechanical parts are horizontally mounted.
A pair of left and right reel base gears 22a integrally formed on the outer circumferences of the lower ends of the pair of left and right reel bases 22 are constantly meshed with the brake drum gears 26a formed on the outer circumferences of the pair of left and right brake drums 26. a pair of right and left reel table 22 and the small tape cassette position corresponding sub-interval L ₁ shown by a solid line in FIG. 19 around the pair of the brake drum 26, large-size tape cassette of the large distance L ₂ indicated by the chain line in FIG. 19 It is symmetrical with respect to the corresponding position in the directions of arrows a and b, and is reciprocated by a circular motion. A band brake 27 is wound around the tape supply side brake drum 26 arranged on the tape supply side (right side in FIG. 19), and the band brake 27 is braked by a tension regulator 24a in a tape loading mechanism 24. It is configured to provide force control. Then, the tape winding side (Fig. 1
The soft brake 28 is in contact with the outer periphery of the tape winding side brake drum 26 arranged on the left side (9). In addition, the tape winding side brake drum 26,
A one-way clutch 29 is built in between the outer periphery and the brake drum gear 26a.

Then, as shown in FIGS. 17 and 18, the large and small tape cassettes 11 and 12 are moved to their front ends 11a and 11a by a cassette attaching / detaching device which will be described later.
In a vertical state with 12a facing downward, the pair of left and right tape reels 13 are mounted in parallel and selectively on the mechanical deck 21, and are engaged laterally with the pair of left and right reel bases 22, respectively. At this time, the pair of left and right positioning pins 23 on the mechanical deck 21 causes the large and small tape cassettes 11 and 12 to move to the front ends 11a and 1 thereof.
2a and the center in the left-right direction are aligned on the horizontal reference line X and the vertical reference line Y on the mechanical deck 21, respectively. After the cassette is loaded, the tape loading mechanism 2
4, the magnetic tapes 14 in the large and small tape cassettes 11 and 12 are pulled out downward from these intermediate openings 15 and loaded on the rotary head drum 25, and the magnetic tapes of the large and small tape cassettes 11 and 12 are loaded. It is configured such that 14 selective recording and reproducing operations are performed. At the time of recording, reproducing and fast-forwarding the magnetic tape 14, the back tension of the magnetic tape 14 is controlled to a constant value by controlling the braking force of the tape supply side brake drum 26 by the band brake 27, and rewinding. At times, the soft brake 28 applies a light braking force to the tape winding side brake drum 26 to prevent the magnetic tape 14 from running out of control. It should be noted that at the time of recording / reproducing or fast-forwarding, the one-way clutch 29 of the tape winding side brake drum 26 is in a freely rotating state, so that the soft brake 28 does not become a load.

Next, as shown in FIGS. 11 to 16, the pop-up type cassette attaching / detaching device 33 passes through a substantially rectangular opening 3 formed on the side surface of the outer case 2 of the video camera main body 1 and then the cassette attaching / detaching device 33 is opened. A vertical cassette holder 34 is provided inside and outside the outer case 2 so that it can be inserted and removed in the horizontal and horizontal directions of arrows c and d. A mouth 35 is formed. And the outer case 2
A door 36 for opening and closing the opening 3 of the cassette holder 34 is vertically attached to the side surface of the top plate 34c of the cassette holder 34, and the door 36 is slidable in the up and down directions of arrows e and f with respect to the cassette holder 34. Is configured.

The cassette holder 34 is a pop-up mechanism (not shown) attached to the mechanical deck 21.
When the eject button (not shown) is pressed, the cassette holder 34 opens as shown in FIG. 11 and FIG. 12A. While being popped up in the direction of arrow c to the cassette loading / unloading position P ₁ outside the outer case 2 through the portion 3, the door 36 is slid in the direction of arrow e below,
The cassette loading / unloading port 35 of the cassette holder 34 is largely opened. Therefore, as will be described later, after selectively inserting the large and small tape cassettes 11 and 12 downward into the cassette holder 34 from the cassette loading / unloading port 35 in the direction of arrow e, (B in FIGS. 11 and 12). ), When the door 36 is pushed from the direction of the arrow d and the cassette holder 34 is pushed through the opening 3 to the cassette mounting position P ₂ in the outer case 2, the door 36 is slid in the direction of the arrow f and is moved in the direction of the arrow d. And the door 36 closes the opening 3.

Then, by this cassette mounting operation,
As shown in FIGS. 17 and 18, the large and small tape cassettes 11 and 12 are arranged so that their front ends 11a and 12a and the center in the left-right direction are aligned with the horizontal reference line X and the vertical reference line Y on the mechanical deck 21, respectively. Then, in the downward vertical state, the mechanical deck 21 is selectively mounted from the direction of the arrow d. Then, when ejecting the large and small tape cassettes 11 and 12 after recording and reproducing, the eject button is pressed in the reverse operation when the cassette is mounted, and as shown in FIGS. 34 is popped up in the direction of arrow c to the cassette loading / unloading position P ₁ outside the case 32, and the door 36 is slid in the direction of arrow c to greatly open the cassette loading / unloading port 35, and the large and small tape cassettes 11 and 12 are shown. Is pulled out from the inside of the cassette holder 34 in the upward direction of arrow f.

As shown in FIGS. 10 to 14, the cassette holder 34 is made of sheet metal or the like, and has a bottom plate 3
4a and the left and right side plates 34b form a substantially U-shaped cross section. And this cassette holder 3
4 is arranged in a vertical shape parallel to the side surface of the vertical mechanical deck 21, and the opening on the upper end side of the cassette holder 34 is configured as a cassette inlet / outlet port 35. The door 36 is parallel to the bottom plate 34a on the side surface of the top plate 34c which is a dyeing member installed between the open ends of the left and right side plates 34b of the cassette holder 34, and in the up and down directions of the arrows e and f. It is slidably attached. On the bottom plate 34a of the cassette holder 34, a pair of left and right, which is substantially L-shaped and symmetrically formed, is opposed to the moving range of the pair of left and right reel bases 22 shown in FIGS. Reel base insertion holes 52 are formed, and the front end 11a of the large-sized tape cassette 11 and the center in the left-right direction are aligned with the horizontal reference line X and the vertical reference line Y on the mechanical deck 21 at the left and right ends of the bottom plate 34a. A pair of left and right large cassette stoppers 38 are integrally processed.

As shown in FIGS. 8 to 10, the front end 12a of the small tape cassette 12 and the center in the left-right direction are placed on the mechanical deck 21 at a position offset to the lower end side of the bottom plate 34a of the cassette holder 34. A pair of left and right small cassette guides 39 formed of synthetic resin or the like for aligning with the horizontal reference line X and the vertical reference line Y are attached.
The pair of left and right small cassette guides 39 are arranged parallel to the vertical reference line Y at positions equally distributed to the left and right with respect to the vertical reference line Y, and the mechanical deck 21 of the pair of left and right small cassette guides 39 is arranged. The left and right sides of a pair of left and right symmetrical lower surface 39c are fixed to each other by welding or the like, and the outer ends of these plate springs 40 are the lower surface 3 which is the side surface of the bottom plate 34a on the mechanical deck 21 side.
4a ″ are fixed to each other by a pair of caulking pins 41. Then, the pair of left and right small cassette guides 39 are passed through the pair of left and right guide insertion holes 42 formed in the bottom plate 34a as shown in FIG. The height H is on the upper surface 34a 'side which is the side surface of the bottom plate 34a on the cassette insertion space side.
₁ and the bottom surface 34 which is the side surface of the bottom plate 34a on the mechanical deck 21 side, as shown in FIG. 8B.
A pair of left and right leaf springs 40 are configured to be movable in the directions of arrows c and d between the position a and the position released to the height H ₂ .

As shown in FIGS. 8 to 10, a taper surface 42 for invoking the small tape cassette 12 is formed on the upper end sides of the facing surfaces 39a of the pair of left and right small cassette guides 39 which face each other in the left-right direction. A slope 44 is formed at the upper end of the upper surface 39b perpendicular to the facing surface 39a. Then, as shown in FIG. 8, the stopper piece 45 integrally formed on the upper ends of the lower surfaces 39c of the pair of left and right small cassette guides 39 has the lower surface 34 of the bottom plate 34a.
The upper surface 3 of the bottom plate 34a of the pair of left and right small cassette guides 39 is brought into contact with the a "in the direction of the arrow c.
The amount of protrusion to the 4a 'side is restricted. A pair of left and right small cassette stoppers 46 for aligning the front end 12a of the small tape cassette 12 with the horizontal reference line X on the mechanical deck 21 are biased toward the inner side of the facing surface 39a at the lower ends of the pair of left and right small cassette guides 39. It is integrally molded in a vertical position.

Then, as shown in FIG. 13, the small tape cassette 12 is inserted between the pair of left and right small cassette guides 39 in the direction of arrow e, and these small cassette guides 3 are inserted.
The center of the small tape cassette 12 in the left-right direction is positioned on the vertical reference line Y by 9 and the left and right ends of the front end 12a of the small tape cassette 12 are attached to the pair of left and right small cassette stoppers 46 of these small cassette guides 39. A pair of left and right stopper insertion grooves 12b formed in parallel with each other are inserted from the direction of arrow e so that the front end 12a of the small tape cassette 12 is positioned on the horizontal reference line X by the pair of left and right small cassette stoppers 46. Is configured. Then, one small cassette stopper 46 also releases the lock lever (not shown) of the opening / closing lid 16 of the small tape cassette 12. Further, as shown in FIG. 14, the large tape cassette 11 is inserted between the left and right side plates 34b of the cassette holder 34 in the direction of arrow e, and the center of the left and right direction is positioned on the vertical reference line Y, and Front end 11a of large tape cassette 11
Is abutted against the pair of left and right large cassette stoppers 38 in the direction of arrow e and positioned on the horizontal reference line X. The lock lever (not shown) of the opening / closing lid 16 of the large-sized tape cassette 11 is released by a raising piece (not shown) raised on the bottom plate 34a.

Then, as shown in FIGS. 13 and 14,
A pair of left and right small cassette guides 3 of the cassette holder 34
9, the cassette pressing member 48 is located at a position crossing in the left-right direction on the upper side of the upper plate 9 and is offset to the top plate 34c side between the left and right side plates 34b.
Are arranged horizontally. The cassette pressing member 48 is mounted between the left and right side plates 34b of the cassette holder 34 via a pair of left and right fulcrum pins 49 so as to be rotatable in the directions of arrows m and n.
Reference numeral 8 is rotationally biased in the direction of arrow m, which is the cassette pressing direction, by a pair of left and right tension coil springs 50 which are biasing means.

The video tape recorder 4 of this prior application example is
The small tape cassette 12 is constructed as described above.
11A and FIG. 13, when the small tape cassette 12 is placed with the front end 12a side thereof facing downward, the small tape cassette 12 is almost left-right in the cassette holder 34 at the cassette loading / unloading position P _1. The small tape cassette 12 is vertically inserted into the central portion from the direction of the arrow e, and is inserted between the pair of left and right small cassette guides 39, and the cassette pressing member 48 is urged to rotate in the direction of the arrow m by the tension coil spring 50. While the small tape cassette 12 is pressed in parallel on the bottom plate 34a, the small tape cassette 12 is brought into contact with the pair of left and right small cassette stoppers 46 of the pair of left and right small cassette guides 39 and stopped until the insertion reference position. The tape cassette 12 is inserted in the cassette holder 34 to a deep position in the direction of arrow e. When the small tape cassette 12 is completely inserted into the cassette holder 34, the cassette holder 34
A pair of left and right reel bases 22 on the mechanical deck 21 are instantly moved in the direction of arrow a as detected by a sensor (not shown) attached to the reel bases 22. The interval is automatically adjusted to the small interval L ₁ corresponding to the small tape cassette 12.

Therefore, after the insertion of the small tape cassette 12 is completed, the door 36 is pushed by the finger in the direction of the arrow d as shown in FIG. 11B, so that the cassette holder 34 is moved from the cassette loading / unloading position P _1. through the opening 3 to the cassette mount position P ₂ in the exterior case 2 as pushed parallel to the direction of arrow d, miniature tape cassette 12 and 17
It is mounted on the mechanical deck 21 as shown in. The cassette holder 34 is automatically locked on the mechanical deck 21 by a lock mechanism (not shown) at the cassette mounting position P ₂ . When the cassette is attached, the door 36
Is slid in the direction of arrow f with respect to the cassette holder 34, and the door 36 closes the opening 3 of the outer case 2.
At this time, the opening / closing lid 16 of the small tape cassette 12 is opened by the lid opening / closing member (not shown) in the direction of arrow o by the mounting operation of the cassette holder 34 to the cassette mounting position P ₂ from the direction of arrow d. Then, the magnetic tape 14 in the small tape cassette 12 can be pulled out downward from the central opening 15. Then, when the eject button is pressed when the small tape cassette 12 is taken out,
The lock of the cassette holder 34 on the mechanical deck 21 is released. Then, as shown in FIG. 11A, as described above by the pop-up mechanism (not shown),
The cassette holder 34 passes through the opening 3 from the cassette mounting position P ₂ and the cassette loading / unloading position P ₁ outside the outer case 2.
Is popped up parallel to the direction of arrow c. And
As described above, the door 36 is slid in the arrow e direction with respect to the cassette holder 34,
The cassette loading / unloading port 35 is largely opened.

Next, when the large tape cassette 11 is mounted, as shown in FIGS. 12A and 14, the large tape cassette 11 is placed with its front end 11a side facing downward.
From the arrow e direction between the right and left side plates 34b of the cassette holder 34 in the cassette out put position P ₁ is inserted vertically, while pressing parallel large tape cassette 11 on the bottom plate 34a by the cassette pressing member 48, the front end The front end 11a of the large-sized tape cassette 11 is inserted in the direction of the arrow e to a deep position in the cassette holder 34 until the insertion reference position where the large tape cassette 11a is stopped by being brought into contact with the pair of left and right large cassette stoppers 38. At this time, the bottom surface 11b of the large-sized tape cassette 11 rides on the upper surface 39a from the slope 44 of the pair of left and right small cassette guides 39, so that the pair of left and right small cassette guides 39
Moves away from the leaf springs 40 and sinks in the direction of the arrow d toward the lower surface 34a ″ side below the bottom plate 34a, so that the large tape cassette 11 passes over the pair of left and right small cassette guides 39 and the arrow When the large tape cassette 11 is completely inserted into the cassette holder 34, the cassette holder 34 is inserted.
18, a pair of left and right reel bases 22 on the mechanical deck 21 are instantly moved in the direction of arrow b to be detected by a sensor (not shown) attached to the reel bases 22. The spacing is automatically adjusted to a large spacing L ₂ corresponding to the large tape cassette 11.

Then, after the insertion of the large tape cassette 11 is completed, as shown in FIG. 12B, the door 36 is pushed by the finger in the direction of the arrow d to move the cassette holder 34 to the cassette loading / unloading position P in the same manner as described above. ₁ through the opening 3 to the cassette mount position P ₂ in the exterior case 2 is pushed parallel to the direction of arrow d, as shown in FIG. 18, fitted with a large-size tape cassette 11 on the mechanical deck 21, the large-size tape cassette The opening / closing lid 16 of 11 is opened in the direction of arrow o by a lid opening / closing member (not shown), and the cassette holder 3
The opening 36 of the case 32 is closed by the door 36 slid in the direction of arrow f with respect to 4. Then, when the large-sized tape cassette 11 is taken out, as shown in FIG. 12A, the eject button is pressed and the cassette holder 34 is moved from the cassette mounting position P ₂ through the opening 3 by the pop-up mechanism in the same manner as described above. While popping up parallel to the outside cassette loading / unloading position P _{1 in the} direction of arrow c, the door 36 is slid in the direction of arrow e with respect to the cassette holder 34 to open the cassette loading / unloading port 35 of the cassette holder 34 greatly.

[0017]

In the video tape recorder 4 of the prior application example configured as described above, as shown in FIG. 19, the intervals between the pair of left and right reel stands 22 are large and small tape cassettes 11, Large and small interval L corresponding to 12
_In order to adjust to L ₁ and L ₂ , a method is adopted in which the pair of left and right reel bases 22 are symmetrical with respect to the pair of left and right brake drums 26 and are reciprocated in the directions of arrows a and b by a circular motion. There is. On the other hand, the cassette holder 34
The tip 12 of the small tape cassette 12 on the bottom plate 34a of the
a and the horizontal center are the horizontal reference line X and the vertical reference line Y.
The installation place on the bottom plate 34a of the pair of left and right small cassette guides 39 for positioning at the upper insertion reference position is limited by itself, and as shown by the one-dot chain line in FIG.
The pair of left and right small cassette guides 39 are arranged directly above the pair of left and right brake drums 26,
When the cassette holder 34 is lowered to the cassette mounting position P ₂ , these brake drums 26 become obstacles to these small cassette guides 39.

Further, as shown in FIG. 13, when the small tape cassette 12 is inserted into the cassette holder 34,
The pair of left and right stopper insertion grooves 12b are smoothly engaged with the small cassette stoppers 46 of the pair of left and right small cassette guides 39 in the direction of arrow e, and the front end 12a of the small tape cassette 12 is horizontally moved by the pair of left and right small cassette stoppers 46. Be able to accurately position on the reference line X. Alternatively, as shown in FIG. 14, when the large tape cassette 11 is inserted into the cassette holder 34, the pair of left and right small cassette guides 39 are moved to the lower surface 34a ″ side below the bottom plate 34a by the bottom surface 11b of the large tape cassette 11. state in order to escape smoothly, as shown in (B) of FIG. 8, the pair of right and left small cassette guides 39 is projected by the height H ₁ in the direction of arrow c to the upper surface 34a 'side of the bottom plate 34a It is preferable to set the pair of left and right small cassette guides 39 so as to be inclined with respect to the bottom plate 34a in the direction of arrow e which is the cassette insertion direction and have the elevation angle θ ₁ .

On the other hand, as shown in FIGS. 18 to 20, a pair of bilaterally symmetrical leaf springs 40 that support a pair of left and right small cassette guides 39 are normally in the cassette insertion direction of these small cassette guides 39. A front leaf spring portion 40a and a rear leaf spring portion 40b supporting the front side 39A and the rear side 39b with respect to the direction of the arrow e are formed in a bifurcated shape from the base portion 40c, and the base portion 40c is formed into a small cassette guide 39. Is fixed to the lower surface 39c of the sheet by welding or the like and is a free end portion 40 which is an outer end of the front and rear leaf spring portions 40a and 40b.
d and 40e are fixed to the bottom plate 34a by the pair of caulking pins 41.
Of the front and rear leaf springs 40a and 40b, and the width W ₁ and the length L _{1 of the} front and rear leaf springs 40a and 40b.
If the values are simply made equal, the spring forces of the front and rear leaf spring parts 40a and 40c become uniform, and
As shown in FIG. 3, these small cassette guides 39 are inclined by the leaf springs 40 in the inclined posture in which the elevation angle θ ₁ is maintained between the upper surface 34a ′ side and the lower surface 34a ″ side of the bottom plate 34a of the cassette holder 34, and the arrow c, In this way, the small cassette guides 39 move in parallel in the directions of the arrows c and d in the tilted posture maintaining the elevation angle θ ₁ in this way. Three
The movement stroke S ₁ of the front side 39A and the rear side 39B of 9 is a large movement stroke S _{1 which} is 2 to 3 times the thickness T ₁ of these small cassette guides 39.

As a result, as shown in FIGS. 8B and 16, these small cassette guides 39 are released by the large tape cassette 11 toward the lower surface 34a "of the bottom plate 34a of the cassette holder 34 in the direction of arrow d. The height H ₂ which is an escape allowance at the time of hitting becomes extremely large, and a large space S ₂ must be secured between the bottom plate 34a and the mechanical deck 21. That is, the lower surface 34a ″ of the bottom plate 34a ″.
A pair of left and right brake drums 26, which are obstacles, are arranged directly below the pair of left and right small cassette guides 39 that are released to the side in the direction of arrow d, and between these small cassette guides 39 and the mechanical deck 21. Includes a clearance H ₃ which is a necessary minimum clearance for preventing the front side 39A of these small cassette guides 39 from contacting (interfering with) the top of the brake drum 26, and the absolute height of the brake drum 26 with respect to the mechanical deck 21. Since H ₄ must be secured, the large space S ₂ is S ₂ = H ₂ + H
₃ + H ₄ , and this space S ₂ becomes large due to the height H ₂ which is the clearance allowance of the small cassette guide 39. The space S ₂ is an important factor for making the video tape recorder 4 thinner.
_{If 2} is large, there is a problem that the video tape recorder 4 becomes thick.

The present invention has been made to solve the above-mentioned problems, and it is possible to suppress the escape amount when the small cassette guide is escaped below the bottom plate of the cassette holder by the large tape cassette. It is an object of the present invention to provide a cassette type recording / reproducing device.

[0022]

In the cassette type recording / reproducing apparatus of the present invention for achieving the above object, a pair of left and right small cassette guides are urged to move above a bottom plate of a cassette holder by a pair of left and right leaf springs. When this is done, the small cassette guides are placed in an inclined posture having an elevation angle with respect to the bottom plate in the cassette insertion direction, and these small cassette guides are selectively inserted into the cassette holder by the large tape cassette. Has a means for canceling the elevation angle of these small cassette guides and changing these small cassette guides to a posture substantially parallel to the bottom plate when they are released below the bottom plate against these leaf springs. It is a thing.

In the cassette type recording / reproducing apparatus of the present invention configured as described above, when the pair of left and right small cassette guides are moved and biased above the bottom plate of the cassette holder by the pair of left and right leaf springs, these small cassette guides are moved. Since the cassette guide is tilted with respect to the bottom plate with an elevation angle toward the cassette insertion direction, when inserting the small tape cassette into the cassette holder, the small tape cassette is smoothly engaged with the small cassette guide. Easy to combine,
Further, when the large tape cassette is inserted into the cassette holder, the small tape guide can be smoothly released below the bottom plate of the cassette holder against the leaf spring by the large tape cassette. Even so, when the small cassette guides are released below the bottom plate by the large tape cassette inserted in the cassette holder, the elevation angles of these small cassette guides are canceled and these small cassette guides are changed to the posture parallel to the bottom plate. Therefore, the amount of escape of these small cassette guides to the lower side of the bottom plate can be suppressed to be small.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a video tape recorder integrally incorporated in a video camera which is a cassette type recording / reproducing apparatus to which the present invention is applied will be described below with reference to FIGS. It should be noted that the same reference numerals are given to the same structural portions as those in FIGS.

First, FIGS. 1 to 4 show a first embodiment, in which a front leaf spring portion 40 of a pair of left and right leaf springs 40 supporting a pair of left and right small cassette guides 39 is shown.
a and the rear side leaf spring portion 40b are curved in a U-shape which is substantially symmetrical with respect to the base portion 40c, and the free end portions 40d of the front side and rear side leaf spring portions 40a and 40b are close to the small cassette guide 39. , 40e are fixed to the lower surface 34a ″ of the bottom plate 34a by a pair of caulking pins 41. The front and rear leaf spring portions 40a, 40b are curved in a U shape so that the front and rear leaf spring portions are bent. 40
The effective spring lengths L ₁₁ and L ₁₂ from the base portion 40c of the a and 40b to the free end portions 40d and 40e are sufficiently long. However,
In this case, L ₁₁ = L ₁₂ . And the front leaf spring part 4
Reference numeral 0a denotes a pair of inner and outer spring pieces 40 curved in the U shape.
a ′ and 40a ″ have the same width W ₁₁ , and the rear leaf spring portion 40
b is a pair of inner and outer spring pieces 40 curved in the U shape.
Among the widths of b ′ and 40b ″, the width W ₁₂ of the inner spring piece 40b ′ is smaller than the width W ₁₁ of the outer spring piece 40b ″. That is, when W ₁₁ > W ₁₂ , the spring force F _{1 of} the front side plate spring portion 40a supporting the front side 39A of the small cassette guide 39 is set.
The spring force F ₂ of the rear leaf spring portion 40b that supports the rear side 39B of the small cassette guide 39 is smaller than that of FIG. That is, F ₁ > F ₂ .

Therefore, according to the first embodiment, as shown in FIG. 1B, the small cassette guide 39 is passed by the leaf spring 40 through the insertion hole 42 and the upper surface 3 of the bottom plate 34a.
The when only the height H ₁ projecting in the direction of arrow c to 4a 'side, the spring force F by abutment of the arrow c direction on the lower surface 34a "of the bottom plate 34a of the stopper piece 45 of the front 39A of the small cassette guide 39 _The front leaf spring portion 40a having a large ₁ regulates the amount of rise of the front side 39A of the small cassette guide 39, and the rear leaf spring portion 40b has a small spring force F _2.
The rear side 39B of the small cassette guide 39 is rotated in the direction of arrow g around the stopper piece 45 as the center of rotation and is raised in the direction of arrow c, so that the small cassette guide 39 is inserted in the cassette insertion direction with respect to the bottom plate 34a. In an inclined posture having an elevation angle θ ₁ in the direction of arrow e, the height H ₁ is projected to the upper surface 34a ′ side above the bottom plate 34a.

Next, as shown by the alternate long and short dash line in FIG. 3, the bottom surface 11b of the large tape cassette 11 inserted into the cassette holder 34 at the cassette loading / unloading position P ₁ is shown in FIG. 1 (C). So that the small cassette guide 39
Is a leaf spring 40 on the lower surface 34a ″ side below the bottom plate 34a.
When it is released in the direction of arrow d against
As shown in FIG. 2, the amount of depression of the front leaf spring portion 40a having a large spring force F _{1 in the} direction of arrow d is small, while the depression amount of the rear leaf spring portion 40b having a small spring force F ₂ is indicated by arrow d.
Since the amount of depression in the direction becomes large, the front and rear leaf spring portions 40a and 40b are twisted in the directions of arrows i and j, and at this time, the front leaf spring portion 40a having a large spring force F ₁ is generated. The twisting action of the rear leaf spring portion 40b having a smaller spring force F _{2 in} the arrow j direction is greater than the twisting action of the arrow i direction in FIG. As a result, the small cassette guide 3
9 is rotated in the direction of the arrow h on the rear side 39B, and the movement stroke of the rear side 39B in the direction of the arrow d is larger than the movement stroke S ₁₁ of the front side 39A of the small cassette guide 39 in the direction of the arrow d. As S ₁₂ becomes larger, the small cassette guide 39 moves toward the lower surface 34a ″ side below the bottom plate 34a by the arrow d.
When the small cassette guide 39 is completely released in the direction, the small cassette guide 39 is changed to a posture substantially parallel to the bottom plate 34a. That is, the small cassette guide 39 is released below the bottom plate 34a in the direction of the arrow d, and the elevation angle θ ₁ is canceled by the rotating action of the rear side 39b in the direction of the arrow h, so that the small cassette guide 39 is moved to the direction shown in FIG. The inclined posture shown in FIG. 1B is automatically changed to the posture substantially parallel to the bottom plate 34 shown in FIG.

Then, as shown in FIG. 1C, if the small cassette guide 39, which is released in the direction of arrow d below the bottom plate 34a, changes to a posture substantially parallel to the bottom plate 34a, the small cassette is released. The height H ₁₂ of the guide 39, which is the clearance for the bottom plate 34a downward, is the height obtained by subtracting the thickness T ₂ of the bottom plate 34a from the thickness T ₁ of the small cassette guide 39, that is, H ₁₂ = T ₁ -T. ₂ , the height H ₁₂ becomes a very small height which is 1/2 to 1/3 of the height H ₂ of the prior application example shown in FIG. 8C. That is, H ₁₂ <H ₂ . Therefore, after the large tape cassette 11 is completely inserted into the cassette holder 34 as shown by the one-dot chain line in FIG. 13, the cassette holder 34 is moved to the cassette loading / unloading position P as shown by the solid line in FIG. The space S ₁₂ between the bottom plate 34a of the cassette holder 34 and the mechanical deck 21 when it is lowered from ₁ to the cassette mounting position P ₂ in parallel in the direction of arrow d is H ₁₂ + H ₃ + H ₄ , as shown in FIG. It is possible to make it much smaller than the space S ₂ of the prior application example shown in FIG. As a result, the video tape recorder 4 can be significantly thinned.

Next, second to sixth embodiments will be described with reference to FIGS. That is, in the second embodiment shown in FIG. 5A, a pair of inner and outer spring pieces 40a ′, 40a ″ of the front and rear leaf spring portions 40a, 40b of the leaf spring 40 which are curved in a substantially U-shape, and Width W of 40b ', 40b "
_{While making 11} equal, the distance L ₁₄ between the pair of spring pieces 40b ′, 40b ″ of the rear leaf spring portion 40b is larger than the distance L ₁₃ between the pair of spring pieces 40a ′, 40a ″ of the front leaf spring portion 40a. By increasing the spring effective length L ₁₂ of the rear leaf spring portion 40b compared to the spring effective length L ₁₁ of the front leaf spring portion 40a, the spring force F ₁ of the front leaf spring portion 40a becomes larger than the spring force F ₁ of the front leaf spring portion 40a. The spring force F ₂ of the side leaf spring portion 40b is reduced. In addition, in the third embodiment shown in FIG. 5B, a pair of inner and outer spring pieces 40a ′ of the front and rear leaf spring portions 40a and 40b of the leaf spring 40 which are curved in a substantially U shape,
Width W ₁₁ and spacing L _{13 of} 40a "and 40b ', 40b"
On the other hand, the length L ₁₅ from the turning point of the pair of spring pieces 40a ′, 40a ″ of the front leaf spring portion 40a to the free end portion 40d is larger than that of the pair of spring pieces 40b ′ of the rear leaf spring portion 40b, By increasing the length L ₁₆ from the turning point of 40b ″ to the free end portion 40e, the front leaf spring portion 40
by increasing the spring effective length L ₁₂ of the rear leaf spring portion 40b as compared with the spring effective length L ₁₁ of a, the spring force of the front plate spring portion 40a F
The spring force F ₂ of the rear leaf spring portion 40b is larger than that of ₁ .

Next, in a fourth embodiment shown in FIG. 6A, the leaf spring 40 having the shape shown in the prior application is applied to the present invention. In this case, the leaf spring 40 is used. The lengths L ₃ of the front and rear leaf spring portions 40a, 40b of the spring 40 are made equal to make the effective spring lengths L ₁₁ of these springs equal, while the rear leaf spring portion is larger than the width W ₁ of the front leaf spring portion 40a. 40b
By reducing the width W ₂ of the front plate spring portion 40
The spring force F of the rear leaf spring 40b is greater than the spring force F ₁ of a.
_It is a smaller version of ₂ . Further, in the fifth embodiment shown in FIG. 6B, the front and rear leaf spring portions 40a and 40b of the fourth embodiment have the same width W ₁ while the front leaf spring portion 40a. By increasing the length L ₃ + L ₄ of the rear plate spring portion 40b by increasing the length L ₅ + L ₆
The spring effective length L ₁₂ of the rear leaf spring portion 40b is made longer than the spring effective length L ₁₁ of the front leaf spring portion 40a so that the spring force of the rear leaf spring portion 40b is larger than the spring force F ₁ of the front leaf spring portion 40a. The force F ₂ is reduced. Therefore, in the first to fifth embodiments, the difference (F ₁ >) between the spring force F ₁ of the front leaf spring portion 40 a of the leaf spring 40 and the spring force F ₂ of the rear leaf spring portion 40 _b of the leaf spring 40.
F ₂ ), the second to fifth embodiments can achieve the same effect as the above-described first embodiment, and in addition, the spring force difference (F ₁ > F _In order to obtain ₂ ), it is possible to use various combinations of the shapes of the leaf spring 40 shown in the first to fifth embodiments.

Next, a sixth embodiment shown in FIG. 7 is a relief amount regulation for regulating the relief amount of the front side 39A of the small cassette guide 39 in the arrow d direction on the lower surface 34a "side of the bottom plate 34a of the cassette holder 34. In this case, the small cassette guide 39 has a height H above the bottom plate 34a, as shown in FIG.
From position inclined protrudes in the direction of arrow c to elevation theta ₁ to _1, as shown in FIG. 7 (B), the small cassette guide 3
9 is released by the large tape cassette 11 toward the lower surface 34a "below the bottom plate 34a in the direction of arrow d against the leaf spring 40, for example, the front leaf spring portion 4 of the leaf spring 40.
0a is brought into contact with the escape amount regulating stopper 47 to regulate the escape amount of the front side 39A of the small cassette guide 39 in the direction of arrow d, so that the rear side 39B of the small cassette guide 39 is centered on the stopper 47. Mechanically rotate in the direction of arrow h to the small cassette guide 3
It is possible to surely change 9 to a posture substantially parallel to the bottom plate 34a. Therefore, in the sixth embodiment, the small cassette guide 39 is securely placed in a posture substantially parallel to the bottom plate 34a without being influenced by the shape of the leaf spring 40 shown in the first to fifth embodiments. Although it can be changed, the leaf spring 40 of the first to fifth embodiments is added to the sixth embodiment.
It is also possible to use various combinations of the shapes.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention.

[0033]

The cassette type recording / reproducing apparatus of the present invention constructed as described above has the following effects.

According to the first aspect of the present invention, when the pair of left and right small cassette guides are urged to move above the bottom plate of the cassette holder by the pair of left and right leaf springs, these small cassette guides are oriented in the cassette insertion direction with respect to the bottom plate. Since it takes an inclined posture with an elevation angle, when a small tape cassette is inserted into the cassette holder, the small tape cassette can be easily engaged with the small cassette guide, and a large tape holder can be inserted into the cassette holder. When the tape cassette is inserted, the large tape cassette allows the small cassette guide to be smoothly released below the bottom plate of the cassette holder against the leaf spring. And yet,
When the small cassette guide is released below the bottom plate by the large tape cassette inserted in the cassette holder, the elevation angle of these small cassette guides is canceled and these small cassette guides are changed to the posture parallel to the bottom plate. By doing so, it is possible to minimize the amount of escape of these small cassette guides to the lower side of the bottom plate, so that the large tape cassette inserted in the cassette holder at the cassette insertion / removal position can be attached to the cassette mounting position by the cassette holder. In this case, even if an obstacle such as a brake drum is placed directly below the pair of left and right small cassette guides that are released below the bottom plate, it becomes possible to bring the bottom plate extremely close to the obstacle. Therefore, the cassette type recording / reproducing apparatus can be significantly thinned.

According to a second aspect of the present invention, the front leaf spring portion and the rear leaf spring portion of the leaf spring are provided with a difference in spring force so that when the small cassette guide is moved above the bottom plate, the small cassette guide is moved. Inclined to have an elevation angle,
When the small cassette guide is released below the bottom plate, the small cassette guide is changed to be in a posture substantially parallel to the bottom plate, so that the structure and manufacturing are simple, and the low cost is obtained. To be

According to a third aspect of the present invention, when the small cassette guide is released below the bottom plate, the escape amount on the front side of the small cassette guide is regulated by a stopper, so that the small cassette guide is in a position substantially parallel to the bottom plate. Since it is mechanically changed so that the small cassette guide can be changed to a posture almost parallel to the bottom plate without being influenced by the shape of the leaf spring, the reliability of operation can be improved. Can be significantly improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view and a cross-sectional side view illustrating a main part of a first embodiment of a video tape recorder to which the present invention has been applied.

FIG. 2 is a perspective view of a main part of FIG.

FIG. 3 is a partially cutaway side view illustrating an arrangement relationship between a small cassette guide and a brake drum when a large tape cassette is mounted at a cassette mounting position by a cassette holder in the video tape recorder of the present invention.

FIG. 4 is a plan view and a cross-sectional side view in two directions for explaining a bottom plate of a cassette holder, a small cassette guide, and a plate spring in the video tape recorder of the present invention.

FIG. 5 is a partially cutaway plan view for explaining an essential part of the second and third embodiments of the video tape recorder of the present invention.

FIG. 6 is a partially cutaway plan view illustrating a main part of fourth and fifth embodiments of a video tape recorder of the present invention.

7A and 7B are a partially cutaway plan view and a cross-sectional side view for explaining an essential part of a sixth embodiment of a video tape recorder of the present invention.

FIG. 8 is a partially cutaway plan view and a cross-sectional side view for explaining an essential part of the video tape recorder of the prior application example.

9 is a perspective view of a main part of FIG.

10A and 10B are a plan view and a cross-sectional side view in two directions for explaining a bottom plate of a cassette holder, a small cassette guide, and a plate spring in a video tape recorder of the prior application example.

FIG. 11 is a partially cutaway side view for explaining attachment / detachment of a small tape cassette by a cassette holder in the video tape recorder of the prior application example.

FIG. 12 is a partially cutaway side view for explaining attachment / detachment of a large-sized tape cassette by a cassette holder in the video tape recorder of the prior application example.

13A and 13B are a plan view and a cross-sectional side view for explaining the insertion of the small tape cassette into the cassette holder.

14A and 14B are a plan view and a cross-sectional side view for explaining the insertion of the large-sized tape cassette into the cassette holder.

FIG. 15 is a partially cutaway side view for explaining the mounting state of the small tape cassette to the cassette mounting position by the cassette holder of the above.

FIG. 16 is a partially cutaway side view for explaining a mounting state of the large-sized tape cassette to the cassette mounting position by the above cassette holder.

FIG. 17 is a plan view for explaining how the small tape cassette is mounted at the cassette mounting position and the tape loading state in the video tape recorder.

FIG. 18 is a plan view for explaining how a large tape cassette is mounted at the cassette mounting position and the tape loading state in the video tape recorder.

FIG. 19 is a plan view illustrating a positional relationship between a pair of left and right reel stands, a brake drum, a cassette holder, and a small cassette guide in the video tape recorder.

[Explanation of symbols]

11 is a large tape cassette, 12 is a small tape cassette, 21 is a mechanical deck, 26 is a brake drum (obstacle), 34 is a cassette holder, 34a is a bottom plate, 34
a 'is the upper surface of the bottom plate, 34a "is the lower surface of the bottom plate, 39 is a small cassette guide, 40 is a leaf spring, 40a is a front leaf spring portion,
40b is a rear leaf spring portion, 40c is a base portion, 40a ', 40
Reference numerals a ″, 40b ′, and 40b ″ are spring pieces, 41 is a crimping pin, 42 is a guide insertion hole, 45 is a stopper piece, 46 is a small cassette stopper, and 47 is a relief amount restriction stopper.

Claims (3)

[Claims] 1. A plurality of types of tape cassettes having different sizes, a cassette loading / unloading position at which the plurality of types of tape cassettes are selectively loaded and unloaded, and a plurality of types of selectively loaded tape cassettes are recorded. A cassette holder that reciprocates between a cassette mounting position for reproduction, a pair of left and right small cassette guides that are attached to the bottom plate of the cassette holder and are configured to freely move in and out of the bottom plate, The cassette holder comprises a pair of small cassette guides, and a pair of left and right leaf springs for urging the pair of small cassette guides upwardly of the bottom plate of the cassette holder in an inclined posture having an elevation angle toward the cassette insertion direction. When the tape cassette is selectively inserted, the small tape cassette is inserted by the pair of left and right small cassette guides. When the large tape cassette is selectively inserted into the cassette holder, the large tape cassette guides the pair of left and right small cassette guides against the pair of left and right leaf springs. In a cassette type recording / reproducing apparatus configured to escape below the bottom plate of the holder, when the pair of left and right small cassette guides are moved above the bottom plate of the cassette holder by the pair of left and right leaf springs, these small cassettes The guide is tilted with respect to the bottom plate so as to have the above-mentioned elevation angle, and when the pair of left and right small cassette guides are escaped below the bottom plate of the cassette holder by the large tape cassette, these small cassette guides are provided. Cancel the elevation angle of the, and make these small cassette guides almost flat with the bottom plate. A cassette type recording / reproducing apparatus, characterized in that it is provided with a means for changing the posture to a proper posture. 2. A pair of left and right leaf springs are provided with a front leaf spring portion and a rear leaf spring portion respectively supporting a front side and a rear side of the pair of left and right small cassette guides with respect to the cassette insertion direction. By providing a spring force difference between the spring portion and the rear leaf spring portion, when the pair of left and right small cassette guides are moved above the bottom plate, the small cassette guides are inclined so as to have the elevation angle. Let's
When the pair of left and right small cassette guides are escaped below the bottom plate by the large tape cassette, the elevation angles of the small cassette guides are canceled and the small cassette guides are changed to a posture substantially parallel to the bottom plate. 2. The cassette type recording / reproducing apparatus according to claim 1, wherein 3. When the pair of left and right small cassette guides are released to the lower side of the bottom plate by the large tape cassette, these small cassette guides are regulated by the amount of escape on the front side in the cassette insertion direction. 2. The cassette type recording / reproducing apparatus according to claim 1, further comprising a stopper for canceling the elevation angle of the small cassette guides and changing the small cassette guides to a posture substantially parallel to the bottom plate.