JPH01125750A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To prevent a brake band from slacking even when a tension arm turns to a position corresponding to a small tape cassette by providing the tension arm to attach tension on a tape, and an expansion part to absorb the slackness of the brake band between the brake band wound on the outer periphery of a reel base on a supply side. CONSTITUTION:Expansion members 15a and 15b to absorb the slackness of the brake band 16 are provided between the tension arm 13 to attach the tension on the tape and the brake band wound on the outer periphery of the reel base on the supply side. Thereby, at the time of mounting the small cassette smaller than a reference type tape cassette, since the slackness of the brake band can be absorbed by the expansion member even when the tension arm is displaced to the reel base on the supply side so as to respond to the small tape cassette, it is possible to prevent inconvenience such that the brake band is abutted with other members due to the slackness, or that it comes off the reel base on the supply side from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing device, and particularly to a magnetic recording/reproducing device configured to accommodate tape cassettes of different sizes.
Regarding a playback device.

Conventional technology For example, in a magnetic recording/reproducing device such as a video tape recorder, when a tape cassette is installed in the device, a tape loading member fits into the tape cassette, and the tape loading member moves along a guide groove.
The tape in the tape cassette is pulled out and wound around the outer periphery of the rotating drum for magnetic recording/reproduction.

The tape cassette installed in the video tape recorder has, for example, the external shape and size of the casing, the shape of the recess into which the tape loading member, tape tension ball, etc. are fitted, the shape of the tape reel, and the difference between the supply side and take-up side. The distance between tape reels, etc. has been standardized. Therefore, in a magnetic recording/reproducing device, a non-standard tape cassette that is different from a standard tape cassette cannot be inserted into the device.

However, small tape cassettes that are smaller than the standard tape cassettes mentioned above are used for video cameras.
In order to attach this small tape cassette to a device for standard tape cassettes, a separate adapter is prepared, and the small tape cassette is attached via this adapter.

Problems to be Solved by the Invention However, as described above, in order to attach a small tape cassette to a device for standard tape cassettes, it is necessary to prepare the above-mentioned adapter, and it is also necessary to load the small tape cassette into the adapter. After that, the adapter has to be attached to the device, so in conventional devices, there is a problem that the operation of attaching the small tape cassette is troublesome.

In particular, the positions of the tape loading member and tape tension pole when installing the tape cassette are different between standard tape cassettes and small tape cassettes, so one IA
It was difficult to make it possible to directly attach a standard tape cassette and a small tape cassette to the M.

Therefore, the tape loading member that wraps the tape in the tape cassette around the rotating drum and the tension arm that applies tension to the tape are inserted into the first unloading position where they are inserted into a standard tape cassette or into a small tape cassette. It has been considered to be movable to the second unloading position so that one viWl, :IIA quasi-type tape cassette or a small tape cassette can be selectively loaded.

However, in magnetic recording/playback devices such as video tape recorders, the pole of the tension arm slides onto the tape pulled out from the tape cassette to apply a predetermined tension, and one end is attached to the outer periphery of the supply reel stand. A brake band connected to the tension arm is wrapped around it, and the brake band applies braking force to the supply reel stand depending on the rotational position of the tension arm. Therefore, when the tension arm rotates to the second unloading position where it can fit into the small tape cassette, the tension arm is closer to the supply reel stand than the first unloading position corresponding to the tape cassette. At this time, the brake band will become significantly slack. Therefore, when installing standard tape cassettes and small tape cassettes of different sizes, when the small tape cassette is installed, the brake band may loosen significantly and come into contact with other parts, or the brake band may be lower than the supply reel stand. There is a problem that it may come off.

Therefore, an object of the present invention is to provide a magnetic recording/reproducing device that solves the above problems.

Means and Effects for Solving the Problems The present invention provides a magnetic recording/reproducing device that can selectively record multiple types of tape cassettes of different sizes. A telescopic member is provided between the brake band wrapped around the outer circumference of the supply side reel table to absorb the slack of the brake band, so that even if the Tensicon arm is rotated to a position corresponding to a small tape cassette, Brake pan 1 is thick (so as not to loosen).

Embodiment 1 WU and FIG. 2 show an embodiment of the magnetic recording/reproducing apparatus according to the present invention.

In both figures, a magnetic recording/reproducing device 1 directly connects a standard tape cassette 2 (indicated by a dashed line in Fig. 1) or a small tape cassette 3 (indicated by No. 45! It is configured so that it can be installed.

Before explaining the configuration of the 1i111, the standard tape cassette 2 and the small tape cassette 3 will be explained first.
.

The standard tape cassette 2 has a housing 2 as shown in FIG.
A supply side reel and take-up side reel (both not shown)
A lid 2C is provided on the front surface of the housing 2a to protect the front tape path 2b. In addition, the bottom of the housing 2a has a hub hole 2d for the supply reel, a hub hole 2e for the take-up reel,
A hole 2f into which a light emitting element for tape end detection is inserted is open.

Further, on the front side of the bottom of the casing 2a, a guide roller 10b of a loading member 10 on the supply side, which will be described later, and an inclined pole 10 are provided.
0 and a recess 2Q into which the tension pole 13a is fitted;
A recess 2h into which a guide roller 11b1 of a winding-side loading member 11, an inclined ball 11C, a half loading pole 25, and a guide pole 23, which will be described later, are fitted is formed.

As shown in FIGS. 4A and 4B, the small tape cassette 3 has a lid 3b on the front of the housing 3a, and a hub hole 3C for a take-up reel (not shown) on the bottom. It's open.

Also, a take-up reel (not shown) is provided at the bottom and side of the housing 3a.
A part of the gear 3d provided in the body is exposed.

Further, on the front side of the bottom of the small tape cassette 3, there is a recess 3f into which a guide roller 10b1 on the supply side, an inclined ball 10c, and a tension pole 13a, which will be described later, are fitted, and a guide roller 11b, an inclined ball 11c, and a half-loading ball 25 on the winding side, which will be described later. A recess 3g into which the guide ball 23 and the light emitting element 35 fit are formed.

In this way, the standard tape cassette 2 and the small tape cassette 3 not only differ in size and external shape, but also differ in the distance between the supply reel and the take-up reel.
Furthermore, the method of driving the take-up reel is also different.

To install such a standard type tape cassette 2 and a small tape cassette 3 in the same device 1, as shown by the broken line in FIG. 4(C), the hub hole 2d on the supply side of the standard type tape cassette 2 and the hub hole 3c of the small tape cassette 3.

As a result, the recess 3f of the small tape cassette 3.

3o and 3h are the recesses 2g of the standard tape cassette 2.

It will be located inside the tape cassette from 2h.

Therefore, the tension ball 13 that applies tension to the tape
When the small tape cassette 3 is installed, the tension arm 13 having the position a is lower than when the standard tape cassette 2 is installed, as will be described later.
It will be close to 8a.

Next, a schematic configuration of the device M1 will be explained.

As shown in FIG. 1, there is a drum base on the chassis 4.
A rotary drum 6 having a magnetic head (not shown) is provided on the drum base 5. Further, arc-shaped guide grooves 7 and 8 are bored in the chassis 4 on both the left and right sides of the rotating drum 6.

This guide groove 7.8 corresponds to the mounting position of the standard type tape cassette 2 shown in Fig. 3 and the mounting position of the small tape cassette 3 shown in Fig. 4, and is extended toward the tape cassette side compared to the conventional device. There is. Note that the guide groove 8 on the tape winding side (right side) is formed longer than the guide groove 7 on the tape supply side (left side).

10.11 is a tape loading member, which has guide grooves 7,
Insert the bottle (not shown) on the bottom side into the guide groove 7,
Loading base 1 movably provided along 8
0a, 11a, and idle rollers 10b, 11c, which stand vertically from the loading bases 10a, 11a, and the loading base 10a.

An inclined ball 10c projects obliquely from 11a.

11c. Also, tape loading member 10.
11 is driven by a loading drive mechanism 9, which will be described later, and moves to the first unloading position (shown in FIG. 1) where it fits into the tape cassette 2 when the standard tape cassette 2 is loaded, and also moves the small tape cassette 2 to the first unloading position (shown in FIG. 1). When the cassette 3 is loaded, it moves to the second unloading position (shown in FIG. 5(A)) where the small tape cassette 3 is inserted.

Further, the drum base 5 is provided with 7-shaped stoppers 5a and 5b that protrude above the guide groove 7.8, and the tape loading member 10.11 is moved along the guide groove 7.8 as described later. Arrow A.

When moving in the B direction (shown in FIG. 1), the stopper 5a
, 5b and stops at the tape loading completion position.

Note that a plate spring 12 that protrudes in the traveling direction is attached to the loading base 10a of the tape loading member 10 on the tape supply side.

Reference numeral 13 denotes a tension arm, which has a vertical tension pole 13a at its tip and is supported by a shaft 4a on the chassis 4. Further, one end of a coil spring 14 (indicated by a broken line in FIG. 1) is hooked to the arm portion 13b of the tension arm 13, and the other end of the coil spring 14 (indicated by a broken line in FIG. It is urged to rotate in the counterclockwise 11 direction by the tensile force. Therefore, tension arm 13
When the tape loading member 10 on the supply side is within its rotation range, it contacts the loading base 10a and rotates following the movement of the loading base 10a.

Further, one end of a toggle member 15 (extensible member), which is a main part of the present invention, is connected to the middle of the tension arm 13. This toggle member 15 is formed by bendably connecting a pair of links 15a and 15b in a dogleg shape, and the other end is locked to one end of a brake band 16. The other end of the brake band 16 is locked to a fixing member 17 fixed to the chassis 4, and is wound around the outer periphery of the reel stand 18a on the supply side.

The toggle member 15 is configured to be displaced in a dogleg shape as shown in FIG. 1, but not in the opposite direction. Follow me,
When the loading member 10 is in the first and second unloading positions as shown in FIGS. 1 and 5(A),
Since the tension arm 13 also rotates to the position where it fits into the tape cassette 2 or small tape cassette 3, when the small tape cassette 3 is attached, the tension arm 13
rotates most clockwise and approaches the supply side reel stand 18a. However, a pair of links 15a.

The toggle member 15 made of 15b has links 15a and 15
b absorbs unnecessary slack of the brake band 16 by contracting as if folded.

Therefore, even when a small tape cassette is installed, the brake band 16 does not sag significantly, and the brake band 16 is lower than the reel stand 18a.
It's been a while.

Therefore, as shown in FIG. 5(A), even if the tension arm 13 rotates toward the supply reel 18a, the brake band 16 may loosen significantly and contact other members, or the brake band 16 may There will be no inconvenience such as it coming off the outer periphery of 18a.

A full-width erase head 19 is placed and fixed on the erase base 20. The erase base 20 is rotatably supported by a shaft 20a, and has an impedance of 0-0 on its upper surface.
521 and a guide ball 22 are provided.

23 is a guide ball that stands vertically at the tip of the guide arm 24. 25 is a half-loading ball that stands vertically from the tip of the half-loading arm 26. The guide ball 23 and the half-loading ball 25 have arms 24.26 driven by a ball moving mechanism 27 (to be described later), and a first unloading ball that fits into the standard tape cassette 2 depending on the type of tape cassette to be loaded. position (as shown in FIG. 1) or into a second unloading position (as shown in FIG. 5) where it fits into the miniature tape cassette 3.

Reference numeral 28 denotes a guard ball that prevents the tape from sliding against the rotating drum 6 during half-loading, and extends vertically from the tip of the guard ball arm 29.

Note that the guide ball 23, half-loading ball 25, and guard ball 28 are displaced according to each mode, and details will be described later.

30 is a capstan, which is a capstan motor 30a arranged on the bottom side of the chassis 4 (indicated by a broken line in FIG. 1).
is driven to rotate counterclockwise.

31 is a pinch roller, an arc-shaped pinch roller arm 3
It is rotatably supported at the tip of the pin roller arm 32 during recording/reproduction, and is pressed against the capstan 30 by the upward and downward rotation of the pin roller arm 32 and the horizontal rotation of the base 33 that supports the pinch roller arm 32. do.

Details of the pinch roller drive mechanism 34 that operates the pinch roller 31 in this manner will be described later.

Reference numeral 35 denotes a light emitting element for tape end detection, which stands vertically from the tip of an arm 36 supported on the shaft 4b on the chassis 4.

Note that the arm 36 is urged to rotate counterclockwise by the tensile force of a coil spring 37. Normally, the arm 36 contacts the bin 4C protruding from the chassis 4, and is located at a position corresponding to the hole 2f of the standard tape cassette 2 (as shown in FIG. 1).

Also, when the small tape cassette 3 is installed, the arm 36
is pressed by the arm 24 rotating counterclockwise, and the light emitting element 35 is placed in the position where it is inserted into the small tape cassette 3 (the fifth
(as shown in the figure).

The general configuration of the magnetic recording/reproducing apparatus 1 has been described above, and next, each mechanism for operating each member will be described in detail.

■ [Loading Drive Mechanism] As shown in FIG.
．． Worm gear 4 via gear 42 meshing with gear 41
3. A main cam gear 44 and a worm gear 43 mesh with the worm gear 43 from the horizontal direction.
A sub cam gear 45 that meshes vertically with rotates.

As shown in FIG. 6, the main cam gear 44 is rotated by a main gear 44' that is integral with the main cam gear 44.

It is transmitted via gears 46, 47, 48, 49 to a ring gear mechanism 50 that drives loading members io, i1.

This ring gear mechanism 50 is disposed below the rotating drum 6, and includes a ring gear 50a meshing with the gear 49, and ring gears 50b and 5 disposed above the ring gear 50a.
0c.

Each of the ring gears 50a, 50b, and 50c is coaxially and rotatably supported by three (7) gears 51a, 51b, and 51c that are in contact with each other on the inner circumferential side.

Further, as shown in FIGS. 5(A) and 7(A), the base 10a of the tape loading member 10 on the supply side is connected to a ring gear 50a via a connecting member 55. Note that one end of the connecting member 55 is connected to a sliding member 57 that is biased in the direction of arrow C by the tensile force of a coil spring 56 that is slidably provided on the ring gear 50a.

As shown in FIG. 5(A) and FIG. 7(C), the base 11a of the tape loading member 11 on the winding side is connected to the connecting member 5.
8 and is connected to a ring gear 50c. The connecting member 58 is connected to an opening member 59 that is slidably provided on the ring gear 50c, and the sliding member 59 is biased in the direction of the arrow by the tensile force of the coil spring 60.

Therefore, the loading members 10.11 are moved along the guide grooves 7.11 with the rotation of the ring gears 50a, 50b, 50c, respectively.
Move along 8.

The rotation of the ring gear 50a is controlled by the gear 52. The signal is transmitted to the ring gear 50b via a gear 53a that meshes with the gear 52 and a gear 53b that is integrated with the gear 53.

Further, the rotation of the ring gear 50a is controlled by the gear 52. A small diameter gear 54a that meshes with the gear 52, and a gear 54 that is integrated with the gear 54a.
Furthermore, as shown in FIGS. 7(A), (B), and (C), the ring gear 50a has a gear portion 50 that meshes with the gear 49 on the outer periphery of the ring gear 50a.
a1 is formed within the range of angle α. Further, on the outer periphery of the ring gear 50b, there is a gear portion 50b+ that meshes with the gear 53b.
is formed within the range of angle β. Also, ring gear 50
A gear portion 50c1 that meshes with the gear 54b is formed on the outer periphery of c in the range of angle γ.

The ring gears 50b and 50c are stacked on top of each other as shown in FIG. 5(B) and are integrally coupled.

The ring gears 50b and 50c are shown in FIG. 7(B), (
Since the gear parts 50b+ and 50C1 are overlapped by 8!1 in the state shown in C), a part of the gear parts 50b+ and 50C1 overlap, so the bits of the teeth of each gear part 50t)+ and the teeth of 50C1 are made to match. are integrated.

Since the ring gear 50a is driven by the gear 49, the loading member 10 rotates at a constant speed from the unloading position to the loading completion position. However, the ring gear 50b.

50c is driven at a constant speed via gears 53a and 53b (reduction ratio=1) until the loading member 11 reaches the half-loading position from the unloading position, and from the half-loading position to the loading completion position, as will be described later. is accelerated and driven via gears 54a and 54b (reduction ratio: 1).

In this way, the ring gears 50b and 50c that move the tape loading member 11 on the take-up side are accelerated from the half-loading position and move from the guide groove 7 on the supply side to the take-up side, as shown in FIG. This is because the guide groove 8 has a longer overall length, and the tape loading member 10.1
This is to ensure that the two terminals reach the loading completion position at approximately the same time.

The tape loading members 1o, ii are moved from the first or second unloading position to the half loading position by the rotation of the ring gears 50a, 50b, 50c.
While moving to the O-ding completion position, the tape in the tape cassette 2.3 is pulled out and wound around the rotating drum 6.

Further, by reverse rotation of the ring gears 50a, 50b, and 50c, the tape is returned to the tape cassette 2.3 from the O-ding completion position to the first or second unloading position by wsb.

■ "Ball Moving Mechanism" As shown in FIGS. 1 and 2, the lower surface of the main cam gear 44 that meshes with the worm gear 43 is shown in FIGS.
Cam grooves 448, 44b shown in D) are formed.

A pin 61a of a slide lever 61 slidably provided in the directions of arrows X+ and X2 is fitted into one cam groove 448, and a pin 62a of a swing arm 62 is fitted into the other cam groove 44b.

The slide lever 61 has a bottle 61b vertically extending from the other end of the slide lever 61, and a leaf spring 63 that holds the bottle 61b.
It is connected to the fan-shaped gear 63 via a. The sector gear 63 is rotatably supported by a pin 4d on the chassis 4.

Therefore, when the cam gear 44 rotates counterclockwise, the slide lever 61 slides in the direction of arrow X + force according to the rotation position of the cam groove 44b, and the fan-shaped gear 63 rotates clockwise accordingly. Furthermore, the rotation of the fan-shaped gear 63 is transmitted to the gear 24a of the arm 24 via the gear 64, as shown in FIG.

As a result, the arm 24 rotates clockwise, and the arm 24
As shown in the cam diagram of FIG. 9(a), the guide ball 23 provided at the tip of the main cam gear 44 is displaced to a position corresponding to each mode as the main cam gear 44 rotates.

Further, the rotation of the fan-shaped gear 63 is caused by the rotation of the gear 6 which meshes with the gear 64.
5a1 is transmitted to the gear 26a of the arm 26 having the half-loading ball 25 via a small-diameter gear 65b that is integrated with the gear 65a, and a gear 66 that meshes with the small-diameter gear 65b. Therefore, the arm 26 rotates according to the rotation position of the cam groove 44b, and the half-loading ball 25 moves to the ninth position.
As shown in the cam diagram in Figure (a), as the main cam gear 44 rotates, it is displaced to a position corresponding to each mode.

Further, the swing arm 62 is connected to a pin 67a of a swing gear 67 via a leaf spring 62b. The swing gear 67 is rotatably supported by the pin 4e, and the swing gear 67 is rotatably supported by the pin 4e.
It meshes with the Also, the swing gear 67 is a coil spring 6.
It is rotated counterclockwise by the tensile force of 9.

Therefore, as the cam gear 44 rotates clockwise,
The swing arm 62 that engages with the cam groove 448 rotates counterclockwise. As the swing arm 62 rotates, the swing gear 67 rotates clockwise, and the rotation is caused by the rotation of the gear 68.
Gear 2 of arm 29 with guard ball 28 through
9a. Therefore, the arm 29 has the cam groove 44a.
As shown in the cam diagram of FIG. 9(b), the guard ball 28 is displaced to a position corresponding to each mode as the main cam gear 44 is rotated.

■ "Pinch Roller Drive Mechanism" As shown in FIG.
a, and is rotated upward by the elastic force of a torsion spring (not shown) wound around the shaft 33a. Therefore, the arm 32 rotates so that the pinch roller 31 moves upward. Also, the base 33 is the chassis 4
It is rotatably supported at the top.

As shown in FIG. 10, the upper surface of the main cam gear 44 is provided with a cam groove 44c for rotating the pinch row 5 and a cam groove 446 for rotating the pinch 0-ra.

A pin 70a of a slide lever 70 that is slidable in the arrow Yt and Y2 directions is fitted into the cam groove 44c. Further, one end of a rotating member 71 whose intermediate portion is rotatably supported is connected to the slide lever 70, and the other end of the rotating member 71 is connected to a slide rack 72 that slides in the arrow Y+ and Y2 directions. is connected to.

The slide rack 72 has a rank 72a that meshes with the gear 33b of the base 33.

In addition, an arm 73 is provided in the cam groove 446 for pinch roller compression.
The arm 73 is connected to two plates 74 and 75 supported by the bin 4f. These two plates 74 and 75 are integrated by the tension of a coil spring 76.

The plate 75 is also provided with a bent portion 75a which comes into contact with the protruding pin 32a (shown in FIG. 2) at the intermediate portion of the arm 32 when the pinch roller arm 32 rotates. As will be described later, this bent portion 75a presses the pin 32a of the pinch roller arm 32 through the spring force of the spring 76 during recording/reproduction, and presses the pinch roller 31 against the capstan 30.

Also, worm gear 43! I! The sub cam gear 45, which meshes with each other from the perpendicular direction, has a cam groove 45a, as shown in FIG. This cam*45a has an up/down arm 77.
The pin 77a is engaged, and the up-down arm 77
is rotatably supported by a bracket 78. Furthermore, a roller 77b is provided at the end of the up-down arm 77.

The pinch roller arm 32 is biased to rotate so that the abutting portion 32b at the end abuts against the O-rough 7b of the up-down arm 77. Therefore, when the sub cam gear 45 rotates counterclockwise and the bin 77a moves inward, the up-down arm 77 rotates counterclockwise. and,
The pinch roller arm 32 rotates as the contact portion 32b is pressed upward by the roller 77a of the up-down arm 77, and the pinch row 531 is lowered.

As shown in FIGS. 1 and 2, a reflection pattern (not shown) is formed on the front surface 45b of the cam gear 45 in order to detect the rotation angle for each mode. Further, three optical sensors 79 are provided at positions facing the front surface 45b of the cam gear 45, and the rotational position of the cam gear 45 is detected by a combination of detection signals obtained from the three optical sensors 79. In addition, main cam gear 44 and cam gear 45
Since they have the same diameter, the rotational position of the main cam gear 44 can also be detected from the detection signal of the optical sensor 79.

■ "Tension arm, erase base operation mechanism" As shown in Figs.
0a, and the first unloading position E (tension ball 13
a is inserted into the recess 2q of the standard tape cassette 2) or a second unloading position II (a position where the tension ball 13a is inserted into the recess 3f of the small tape cassette 3).

Therefore, the tension arm 13 is connected to the loading base 1.
0a moves in the six directions of the arrow and rotates counterclockwise by the spring force of the spring 14.

As shown in FIG. 12, when the loading base 10a further moves in the six directions of arrows, the leaf spring 12, which is separated from the tension arm 13 but extends in the direction of movement, moves onto the sliding surface 20b on the lower side of the erase base 20 (see FIG. 12). Slide while pressing (indicated by the broken line).

Therefore, the erase base 20 rotates counterclockwise around the shaft 20a, and its end 20c is attached to the tension arm 1.
3. Therefore, the tension arm 13 is pressed against the end 20c of the erase base 20.

Furthermore, when the loading base 10a moves in the six directions of the arrow and reaches the zero-loading completion position, the loading base 10a passes the erase base 20, so the erase base 20 rotates clockwise and returns to its original position. .

As will be described later, the tension arm 13 further rotates counterclockwise from the position shown in FIG. 12 to fit the tension ball 13a into the recess 20d of the erase base 200. As a result, the tension arm 13 reaches a position where a tape bus is formed during recording/reproduction, and the toggle member 15 is extended linearly to bring the brake band 16 into sliding contact with the reel stand 18a on the supply side.

Furthermore, when returning from the loading completion state to the unloading position, the loading base 10a performs the opposite operation to the above, and the O-loading base 10a
When the loading base 10a returns, the plate spring 12 of the loading base 10a presses the sliding surface 20b of the erasing base 20. At that time, the erase base 20 rotates counterclockwise, and the end 20
The user kicks the tensicon arm 13 at c, and as a result, the tension arm 13 rotates clockwise, causing the tension ball 13a to separate from the recess 20d.

0) Next, in the magnetic recording/reproducing device having the above configuration,
The operation in each mode when installing the standard tape cassette 2 will be explained.

As shown in Fig. 1, a standard tape cassette 2 (in Fig. 1,
When a cassette (indicated by a dashed line) is inserted into the apparatus, a cassette detection switch (not shown) detects the type of cassette. The motor 38 is rotated by a command from a control circuit (not shown), and rotates the worm gear 43 as described above.

The main cam gear 44 is driven by the worm gear 43,
Rotate 90 degrees clockwise as shown in FIG. 8(B).

This rotation of the main cam gear 44 is transmitted to the ring gear mechanism 50 as explained in the above-mentioned section (2) [Loading drive mechanism]. As a result, ring gear 50a rotates clockwise, and ring gears 50b and 50G rotate counterclockwise. Then, the loading members 1o, ii reach the first loading position shown in FIG.

In addition, as explained in the above section ``Ball moving mechanism'', the ball moving mechanism 27 rotates as the main cam gear 44 rotates.
is operated to rotate arms 24,26 to the first unloading position shown in FIG. Also, tension 7-m1
3 follows the loading member 10 and rotates to the first unloading position.

Note that when the tension arm 13 is rotated to the first undoing position 1 (shown in FIG. 1), the toggle member 15
The links 15a and 15b have an abbreviated shape and absorb the slack of the brake band 16 so that the brake band 16 does not loosen significantly.

When the standard tape cassette 2 is lowered into the predetermined mounting position in the device, the guide ball 10 of the 0-ding member 10.11
b, 11t), an inclined ball 100° 11C, a tension ball 13a1, a guide ball 23, and a half-loading ball 25 are included in the standard tape cassette 2 shown in FIG.
recess 2G.

Insert into 2h. Further, the upper part of the reel stands 18a and 18b is the hub hole 2d of the standard tape cassette 2.

At the same time, the light emitting element 35 is fitted into the hole 2f.

Next, as shown in FIG. 8(C), the rotation of the motor 38 causes the main cam gear 44 to further rotate clockwise.

Therefore, the ring gear 50a.

5Qb and 50G are rotated further, and the tape loading member 10.11 is separated by a slight distance from the recesses 2a and 2h of the standard tape cassette 2, and moves to the half zeroing position (shown in FIG. 13). do. Further, the tension arm 13 follows the tape loading member 10 and leaves the recess 2g. In this way, the tension arm 13 rotates to the half-loading position, and
The toggle member 15 connected to the tension arm 13 is
The links 15a and 15b are expanded to open. Therefore,
During half-loading, although the tension arm 13 rotates counterclockwise, the brake band 16 does not come into sliding contact with the outer periphery of the supply side reel stand 18a and maintains a position slightly spaced apart.

Therefore, even if the tape is wound up in a half-loaded state, no braking force is applied by the brake band 16.

Furthermore, the guide ball 23 and the half-loading ball 25 that had been fitted into the recess 2h are moved toward the arrow x1 by the slide lever 61 that engages with the cam groove 44b of the main cam gear 44.
As it slides in the direction, it is displaced to the position shown in FIG. 13 with the arms 24, 26 rotating clockwise.

Therefore, the tape 80 pulled out from the standard type tape cassette 2 has a guide ball 10b, a guard ball 28°, a half-loading ball 25. A tape bus is formed which returns into the tape cassette 2 via the guide ball 23. Note that since the guard ball 28 is not yet displaced and is positioned in front of the rotary drum 6, the tape 80 passes through a position spaced apart from the outer circumference of the guide drum 6. Note that during half loading, the pinch roller 31 continues to move upward.

Further, as shown in FIG. 8(C), during half loading, the swing arm 62 engages with the cam *44a.
2a is in the wide part 44a1 (f7.ffi, so
The swing arm 62 can be rotated slightly clockwise. Therefore, the spring 69 that energizes the swing gear 67
The spring force allows the arm 29 having the guard ball 28 to be rotated counterclockwise, thereby applying tension to the tape 80.

Here, the recording or playback mode is operated. This record/
The regeneration mode operation causes the motor 38 to further rotate, causing the main cam gear 44 to rotate clockwise as shown in FIG. 8(D).

As the main cam gear 44 rotates, the pin 62a of the swing arm 62 that engages the cam rf 444a is displaced toward the inner circumference, so the swing arm 62 rotates counterclockwise. Therefore, the arm 29 having the guard ball 28 is
As shown in FIG. 14, the loading member 11 is rotated largely clockwise to a position where it does not interfere with the movement of the loading member 11.

Main gear 44', which is integral with main cam gear 44, also rotates in the same direction, thereby causing ring gear 50a to further rotate clockwise and ring gears 50b and 50C to rotate counterclockwise. At this time, as described above, the gear portion 50b of the ring gear 50b and the gear 53b are disengaged from each other, and the gear portion 50C of the ring gear 50c is released.
+ and the gear 54b mesh with each other. Therefore, the loading member 10 on the supply side moves in the direction of the arrow B along the guide groove 7, and the loading member 11 on the winding side is further accelerated and moves in the direction of the arrow B along the guide groove 8.

Therefore, as shown in FIG. 14, the loading members io and i1 contact the stoppers 5a and 5b substantially simultaneously while wrapping the tape 80 around the outer periphery of the rotating drum 6, respectively.

Loading base 10 in contact with stoppers 5a and 5b
a and 11b are ring gears 50a, respectively.

The spring force of the coil springs 56, 60 provided at 50c presses and holds the stoppers 5a, 5b.

As the loading member 10 on the supply side moves to the O-ding completion position shown in FIG. 14, the tension arm 13 follows the loading member 10 and rotates counterclockwise as described above, moving the tension ball 13a to the impedance roller. 21 and the guide ball 22.

Therefore, the links 15a and 15b of the toggle member 15 connected in the middle of the tension arm 13 become straight.

Therefore, the tension arm 13 applies pack tension to the tape 80 by bringing the brake band 16 into sliding contact with the outer periphery of the reel stand 18 on the supply side via the toggle member 15.

Furthermore, as the main cam gear 44 rotates, the sub cam gear 45 (shown in FIG. 11) that meshes with the worm gear 43 rotates counterclockwise.

Therefore, as described above, the tape loading member 11 moves in the direction of arrow B along the guide groove 8, and the pinch roller 31 moves in the direction of arrow B.
After passing below, the up-down arm 77 rotates counterclockwise along the cam groove 458 of the sub-cam gear 45, as shown in the cam diagram of FIG. 9(C). Therefore, the contact portion 32b of the pinch roller arm 32 is pressed by the roller 77b of the up-down arm 77 and moves upward. Therefore, the pinch roller arm 32 rotates about the shaft 33a and lowers the pinch roller 31.

Also, cam grooves 44c, 44 on the upper surface side of the main cam gear 44
d also rotates clockwise as shown in FIG. 10 (8), so the pin 70a of the slide lever 70 is displaced inward along the cam groove 44G, and the slide lever 70 is displaced in the direction of arrow Y2.

Further, since the pin 73a of the arm 73 is displaced in the outer circumferential direction along the cam groove 446, the arm 73 rotates clockwise.

Therefore, as shown in FIG. 9(C), after the pinch roller 31 descends, the slide lever 70 slides in the direction of arrow Y2, and this displacement is transferred to the slide rack 7 via the rotating member 71.
2. That is, the slide rack 72 is moved in the direction of arrow Y1.
In the direction! I'll work hard.

Therefore, the base 33 that engages with the rack 72a of the slide rack 72 rotates counterclockwise, and the pinch roller 31
The chi 180 is brought into contact with the capstan 30 by this. Thereafter, as shown in FIG. 9CD), as the arm 73 moves clockwise, the pair of plates 74 and 75 rotate counterclockwise. As a result, the bent portion 75a of the plate 75 comes into contact with the protruding pin 32a of the pinch roller arm 32, and the spring force of the spring 76 urges the arm 32 in the counterclockwise direction.

In this way, the tape 80 is pressed toward the capstan 30 side by the pinch roller 31, runs toward the winding side, and is recorded or reproduced.

Note that the unloading operation is the opposite of the loading operation described above.

(2) Next, the case of mounting the small tape cassette 3 will be explained.

As shown in FIG. 5(A), the small tape cassette 3 (fifth
When a tape cassette (indicated by a two-dot chain line in the figure) is inserted into the apparatus, a cassette detection switch (not shown) detects that it is a small tape cassette.

Then, the motor 38 reversely rotates the worm gear 32 in response to a command from a control circuit (not shown), and rotates the main cam gear 4.
4 to the position shown in FIG. 8(A).

Due to the reverse rotation of the worm gear 32, the ring gear mechanism 50
The ring gear 50c rotates clockwise, and the other ring gears 50b and 50c rotate counterclockwise. Therefore,
The O-ding member 10.11 moves toward the small tape cassette 3 from the first unloading position shown in FIG.

As the loading base 10a on the supply side moves, the tension arm 13 rotates clockwise and reaches the second unloading position shown in FIG. 5(A).

In this way, the tension arm 13 is connected to the supply reel stand 18.
When the toggle member 15 is rotated to the second unloading position adjacent to the side, the links 15a and 15b are folded into a dogleg shape as described above to absorb slack in the brake band 16.

Therefore, the brake pan 16 is mounted on the supply side reel stand 18 in the same way as when the standard tape cassette 2 shown in FIG.
a It is mounted at a position slightly apart from the outer periphery. Therefore, the brake band 16 does not loosen significantly, and is prevented from coming into contact with other members or coming off the supply side reel stand 18a.

Further, due to the rotation of the cam 144b on the lower surface side of the main cam gear 44, the slide lever 61 that engages with the cam groove 44b slides in the two directions of the arrow.

Therefore, the aforementioned ball moving mechanism 27 operates, and the guide balls 23. The arm 24.26 with the half-loading ball 25 rotates counterclockwise as shown in FIG. 5(A). Therefore, the guide ball 23 and the half loading ball 25 are displaced from the first unloading position shown in FIG. 1 to the second unloading position corresponding to the small tape cassette 3.

Therefore, when the small tape cassette 3 is lowered to a predetermined mounting position within the apparatus, the guide balls iob, 1ib, the inclined balls 10c, 11c, the tension ball 13a, the guide ball 23 . The half-loading balls 25 fit into the recesses 3f, 3Q, and 3h of the small cassette tape 3 shown in FIGS. 4(A) and 4(B).

Further, as the arm 24 rotates counterclockwise, the arm 36 having the light emitting element 35 rotates clockwise against the spring force of the spring 37. Therefore, the light emitting element 35 is also connected to the recess 3h of the small tape cassette 3 at the same time as the guide ball 23.
fit inside. Therefore, the light emitting element 35 does not get in the way when the small tape cassette 3 descends.

Further, as the small tape cassette 3 descends to the mounting position, the supply side reel stand 18a fits into the hub hole 3c. Furthermore, a drive gear (not shown) disposed on the lower side of the chassis 4 moves upward, and this drive gear meshes with the winding-side gear 3d. Therefore, the reel on the winding side is driven by this drive gear to wind up the tape.

Next, when the small tape cassette 3 is installed at a predetermined installation position, the motor 38 rotates in the same way as when the standard tape cassette 2 is installed, resulting in the half-loading state shown in FIG. 13.

As the tension arm 13 rotates to the half-loading position in the same manner as when the standard tape cassette is attached, the links 15a and 15b of the toggle member 15, which had been folded up to that point, open and extend, so that the brake band 16 is It maintains a position slightly 11 inches away from the outer periphery of the supply side reel stand 18a. Note that since the arms 24 and 26 rotate clockwise, the arm 36 having the light emitting element 35 returns to its original tape end detection position by the spring force of the spring 37.

Furthermore, by operating the recording/playback mode, the same operation as with the standard tape cassette described above is performed.
The state shown in FIG. 14 is reached. That is, tension arm 1
3, the links 15a, 15 of the toggle member 15
b extends linearly, and the brake band 16 comes into sliding contact with the outer periphery of the supply side reel stand 18a.

In addition, in the fast forward 7 rewind mode, the tape is in a half loading state as shown in FIG. 13, and the tape is run at high speed without coming into sliding contact with the rotating drum 6 and the capstan 30.

In the above embodiment, a toggle member consisting of a pair of links is used as an extensible member for absorbing slack in the brake band, but it is needless to say that the present invention is not limited to this.

Effects of the Invention As described above, in the magnetic recording/reproducing apparatus of the present invention, when a small tape cassette smaller than a standard tape cassette is installed, the tension arm is attached to the supply reel stand side so as to correspond to the small tape cassette. Even if the brake band is displaced, the slack of the brake band is absorbed by the elastic member, so it is possible to prevent the brake band from becoming too loose and coming into contact with other members, or coming off from the supply side reel stand. It has the advantage that it can accommodate tape cassettes of different sizes, and that the telescoping member can be simply constructed by combining a pair of links, for example.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the magnetic recording/reproducing device according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a perspective view for explaining a standard tape cassette, and Fig. 4 is a small-sized 5 is a perspective view for explaining the tape cassette, FIG. 5 is a diagram showing the state when a small tape cassette is installed, FIG. 6 is a plan view showing the ring gear mechanism, FIG. 7 is a plan view of each ring gear, and FIG. The figure shows the cam groove on the bottom side of the main cam gear.
Fig. 9 is a cam diagram, Fig. 10 is a plan view showing the cam groove on the top side of the main cam gear, Fig. 11 is a rear view of the device as seen from the rear, and Fig. 12 is for explaining the operation of the tension arm. FIG. 13 is a plan view during half loading, and FIG. 14 is a plan view during recording/reproduction mode. DESCRIPTION OF SYMBOLS 1... Magnetic recording/reproducing device, 2... Standard tape cassette, 3... Small tape cassette, 6... Rotating drum, z, 8... Guide groove, 9... O-ding Drive mechanism, 10.11... tape loading member, 1
3... Tension arm, 13a... Tension ball, 15... Toggle member, 15a, 15b... Link, 16... Brake band, 19... Full width erase head, 23... Guide ball , 25...half loading ball, 28...guard ball, 30...
・Capstan, 31...Pinch roller, 32...
Pinch roller arm, 34... pinch roller drive mechanism, 35... light emitting element, 38... motor, 44...
Main cam gear, 44a, 44b, 44c, 44d-・
・Cam groove, 45... Sub cam gear, 45a... Cam groove, 5o... Ring gear mechanism, 50a, 50b, 50
c...Ring gear, 61...Slide lever, 62
...Swing arm, 70...Slide lever, 7
1... Rotating member, 77... Up-down arm. Patent applicant: Victor Japan Co., Ltd. Figure 8

Claims (1)

[Claims] A magnetic recording/reproducing device that selectively loads multiple types of tape cassettes of different sizes, and includes a tension arm that applies tension to the tape, and a brake band that is wrapped around the outer circumference of the reel stand on the supply side. A magnetic recording/reproducing device characterized in that an elastic member is provided between the brake bands to absorb slack in the brake band.