JP2001135002A - Reel turntable mechanism of magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such problems with the reel turntable mechanism of conventional magnetic recording and reproducing devices that the structure of the reel turntables is intricate, is large in the thickness of the mechanism and is correspondingly costly. SOLUTION: The reel turntables of the magnetic recording and reproducing device having a sliding chassis 27 for drawing out and forward and reverse traveling of a magnetic tape is constituted by not building torque limiter parts into the reel turntables and arranging the sliding chassis 27 between a tape take-up part and brake pressure contact parts as well as gear parts for driving the respective reel turntables 28 and 29, then arranging a idler gear 31 between a stationary chassis 1 and the sliding chassis 27. The reel turntables and the reel gear parts are press-fitted to the reel turntables by shafts 53 caulked to reel gears 52 and the press-fitting parts of the reel shafts 53 are formed with knurled grooves 56 for preventing removal so as to prevent the removal of the press-fitting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism and a structure of a reel stand of a magnetic recording / reproducing apparatus for pulling out a magnetic tape and performing forward / reverse running.

[0002]

2. Description of the Related Art FIG. 10 is a plan view showing an example of a conventional magnetic recording / reproducing apparatus. Magnetic tape 101 as a recording medium
Is supplied from a supply reel 102, is wound around a rotary cylinder 107 having a recording / reproducing head via a tension pole 103 and respective tape guides 104, 105, 106, and is further wound around a tape guide 108, 109, a tape driving capstan The paper is wound by a take-up reel 113 via a pinch roller 111 and a tape guide 112.

Next, a description will be given of a reel base driving mechanism in the magnetic recording / reproducing apparatus with reference to FIGS.

FIG. 11 is a side view of the supply reel base driving mechanism of FIG. Supply reel 102, take-up reel 1
Reference numerals 13 are respectively fitted rotatably around respective reel shafts 115 and 116 erected from a slide chassis 114. Here, FIG. 12 shows an enlarged side view (a) and a top view (b) of the supply-side reel base 102 in FIG. 11, but the reel-side reel base 113 is completely the same.

In FIG. 10, the main chassis 1
The power transmitted from the capacitor motor 150 disposed on the motor 17 via gears 118 to 121, a belt (not shown), and the like is transmitted to the shaft 1 mounted from the main chassis 117.
It is transmitted to a gear 123 rotatably fitted to 22 and transmitted to a gear 126 rotatable about a shaft 125 erected on a lever 124 rotatable about a shaft 122.
The gear 126 and the lever 124 are engaged by a torque transmitting means (not shown). The rotation of the gear 123 causes the lever 124 to rotate around the shaft 122. When the gear 123 rotates counterclockwise, the gear 127 is rotated. It is installed to mesh with.

Referring to FIG. 12, an example of the structure of a conventional reel base will be described. A hysteresis plate 128 is insert-molded in the gear 127. Gear 129
The yoke plate 130 is insert-molded, and the magnet 131 is attracted. Further, a reel claw 133 and a reel claw spring 134 are attached to the gear 129, and the reel cap 132 is press-fitted. The reel claw 133 receives an upward force by the spring 134,
It is regulated by the reel cap 132.

The gear 127 and the gear 129 are attracted and attracted by a magnet 131 attracted to the gear 129 at a contact portion 136 of the gear 127 and a contact portion 137 of the gear 129 with a washer 135 interposed therebetween.

[0008] The reel base is a slide chassis 114.
Is rotatably fitted to the reel shaft 115 erected at the bottom.

Here, when the gear 126 moves in the direction of arrow a in the figure and meshes with the gear 127, the hysteresis loss due to the magnet 131 and the hiss plate 128 and the gear 12
Power is transmitted from the gear 127 to the gear 129 with a certain torque due to friction loss due to the seven contact parts 136, the gear 129 contact parts 137, and the washers 135.

Here, in FIG. 10, when the gear 123 rotates counterclockwise, the lever 124 rotates counterclockwise about the shaft 122, and the gear 126
Rotates to a position where it meshes with the gear 127, rotates the gear 127 (and the reel base) in a counterclockwise direction, here in the rewinding / winding direction, and the reel claw 133 causes the reel hub 138 (FIG. 12A). Tape 10 wrapped around
1 is wound on a take-up reel 1113.

At this time, the tape 101 is wound with a constant torque by the torque transmitting means (the loss of the magnet 131 due to the hiss plate 128 and the friction loss due to the gear contact portion and the washer).

In FIG. 10, a T (winding) reel side soft brake 140, a lock brake 141, and an S (supply) reel side lock brake 143 are mounted on the shafts 139 and 142 erected on the slide chassis 114. Is arranged, and the T-reel side soft brake 140, the lock brake 141, and the S are operated by a loading motor 144, a mode lever (not shown) operated by a leading gear train (not shown), or the like, depending on the operation mode of the deck. The reel side lock brake 143 and the like are turned on / off. T-reel side soft brake 14
0, the lock brake 141, and the S-reel side lock brake 143 are connected to the gear 127 or the gear 129 (FIG. 12).
By contacting and engaging with (a)), it functions as a soft brake and a lock brake.

[0013]

However, FIG.
In the above-described conventional example, each reel base is arranged on the slide chassis 114, a torque limiter (clutch) mechanism is built in the reel base, and a brake contact portion is also provided, so that the structure of the reel base is complicated. Naru, cassette below ~
It is necessary to increase the thickness between the slide chassis 114. In addition, costs increase accordingly.

From the above, the purpose of the invention according to the present application is as follows:
An object of the present invention is to provide a reel base mechanism of a magnetic recording / reproducing apparatus in which the number of parts is small, the structure is simple, the total thickness of the mechanism is small, and the cost is low.

[0015]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object by providing a reel base mechanism for a magnetic recording / reproducing apparatus as described below.

(1) In a magnetic recording / reproducing apparatus which draws out a magnetic tape and performs forward / reverse running, two chassis, a fixed chassis and a slide chassis supported to be slidable relative to the fixed chassis. Has,
The slide chassis is disposed between the winding portion of the tape, and the brake press contact portion and the reel base driving gear section, and an idler gear for driving the reel base driving gear is disposed between the fixed chassis and the slide chassis. And a reel shaft fixed to the reel drive gear portion is press-fitted into the tape take-up portion, and the reel shaft has the groove for preventing press-fitting. Reel base mechanism.

[0017]

According to the structure of the present invention as described above, a reel unit of a magnetic recording / reproducing apparatus having a slide chassis for pulling out a magnetic tape and running in a forward / reverse direction does not have a built-in torque limiter unit, and has a tape winding unit, A slide chassis is arranged between the brake pressure contact part and a gear part for driving the reel base, an idler gear is arranged between the fixed chassis and the slide chassis, and the reel base and the reel gear part are
The shaft crimped on the reel gear is press-fitted into the reel base, and a knurled groove is formed in the press-fitting portion of the reel shaft to prevent the press-fitting. A simple structure, a reduced total thickness of the mechanism, and a low-cost reel base mechanism can be provided.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on an embodiment with reference to the drawings.

[0019]

(Construction) FIG. 1 is a diagram showing a tape path, a positional relationship between a cassette and a drum / guide post, and a reel driving mechanism in a recording / reproducing state according to this embodiment.

1 is a fixed main chassis, 2 is a drum having a recording and reproducing head, 3 is a capstan formed on the main chassis 1, 39 is a cassette at a recording and reproducing position, 25 is a tension post, 38 is a supply side main inclined post, 20 is a supply side drum winding guide post, 21 is a takeup side drum winding guide post, 26 is a takeup side drawer post, 28 is a supply side reel stand, and 29 is a takeup side. It is a reel stand.

Reference numeral 33 denotes a first pulley formed coaxially with the capstan 3; 40, a timing belt;
A roller for guiding the timing belt 40, 32 is a second pulley, 30 is a drive gear having a torque limiter, and 31 is a supply gear reel 28 and a take-up reel reel 29 with the rotation of the capstan 3. The idler gear 18 that selectively meshes is a pinch roller.

FIG. 2 is a view showing a slide chassis which is slidably supported relative to the main chassis 1 at the time of loading a cassette and at the time of recording and reproduction.

The tension post 25 and the take-up side pull-out post 26 are rotatably supported by a slide chassis 27 via a link mechanism. A supply-side reel base 28 and a take-up-side reel base 29 are rotatably supported on a slide chassis 27, respectively. Cam part 27 'formed on slide chassis 27
Engages with a slide lever configured on the side of the main chassis 1 described later, and performs a sliding operation on the main chassis 1.

FIG. 3 is a view showing a driving mechanism formed on the main chassis 1. As shown in FIG.

4 is a loading motor, 5/6/7 is each gear, 8 is a first cam gear, 9 is a slide lever,
Denotes a loading lever, 12/13/14 denotes each relay gear, 15 denotes a second cam gear, 16 denotes a brake drive lever, 17 denotes a pinch drive lever, and 18 denotes a pinch roller.

FIG. 4 is a view showing a guide post driving mechanism.

Reference numeral 19 denotes a drum base which supports the drum 2 (FIG. 1) and has a guide post positioning portion after the tape is pulled out. Reference numerals 20/21 denote respective guide members having guide posts. A gear portion 22 '/ 2 that engages with the groove formed by the rail 24 and engages with the gear portion of the loading lever 10 (FIG. 3) from the cassette loading position A to the recording / reproducing position B.
3 '. Supply side main inclined post 38
Are formed on the drum base 19.

FIG. 5 is a view showing the main chassis 1.
An electric circuit pattern 43 is formed on the main chassis 1 made of a silicon steel plate. Reference numeral 34 denotes a drive coil of the capstan motor, 44 denotes a Hall element, and 35/36/37 each sensor element.

FIG. 6 is a diagram showing a tape path.

(Operation) Next, the operation of this embodiment will be described with reference to FIGS.
The loading motor 4 (FIG. 3) is rotated, and each gear 5 /
The first cam gear 8 rotates via 6/7. The rotation of the first cam 8 causes the slide lever 9 and the loading lever 10 to rotate in the direction of the arrow in FIG. The rotation of the slide lever 9 in the direction of the arrow moves the slide chassis 27 (FIG. 2) from the cassette loading position to the recording / reproducing position.

At this time, the tension post 25 and the take-up side draw-out post 26 shown in FIG. 1 are moved from the inside of the mouse of the cassette 39 to the front of the cassette 39 by a relative position change with respect to a cam (not shown) formed on the main chassis 1 side. Go to By the rotation of the loading lever 10, the gear part formed on the loading lever 10 drives the gear part of each guide member 22 '/ 23' (FIG. 4), and each guide post 20/21 is moved in the cassette mouse ( The tape is moved from the position A) to the recording / reproducing position (position B) along the groove of the guide rail 24 and the groove of the drum base 19, and the tape stored in the cassette is wound around the drum 2 to be in a state where recording and reproduction are possible. . Each guide post 20/21 is fixed by a positioning portion of the drum base 19.

Further, each relay gear 12/13/14 of FIG.
The power of the loading motor 4 is transmitted to the second cam gear 15 via. The pinch drive lever 17 is driven by the second cam gear 15, and the pinch roller 18 is pressed against or separated from the capstan 3. The tape pulled out of the cassette 39 by the power of the loading motor 4 and wound around the drum 2 is fed by a capstan 3 (FIG. 1) formed on the main chassis 1 and a pinch roller 18.

At this time, the rotational power of the capstan 3 is transmitted to the second pulley 32 via the timing belt 40. The rotation of the second pulley 32 is controlled by the drive gear 30.
The tape transmitted to the take-up reel base 29 via the idler 31 and sent by the capstan 3 and the pinch roller 18 is wound into the cassette by the take-up reel base 29.

As shown in FIG. 6, when the cassette 39 is loaded, the tape pull-out post (tension post 25 /) which exists in the mouse of the cassette 39 and pulls out the tape in the cassette 39 by a loading operation to make it recordable / reproducible. Supply side guide post 20 / Takeup side guide post 21 / Takeup side drawer post 26)
Is a line substantially parallel to the line a connecting the center of the supply-side reel base 28 and the sensor of the take-up-side reel base 29 in a recordable / reproducible state and further existing between the center of the drum 2 and the chassis end face c. It is configured to be located one minute above. At this time, the drum 2 is inclined in the direction of the third quadrant in the XY rectangular coordinate system when the a-line is the X axis and the right side is plus.

Referring now to FIG. 7, the structure of the reel base will be described in detail: 28 (or 29) is on the supply side (S).
A reel stand body (or take-up side (T) reel stand), 51 is a reel stand sleeve set on the slide chassis 27, 52 is a reel drive gear (S reel stand or T reel stand), and a reel shaft 53 is It is fixed by swaging. The reel shaft 53 is fitted through the reel sleeve 51 and press-fitted onto the reel base 28 (or 29).

FIG. 8 is a detailed view of the press-fitting portion of the reel shaft 53. The reel base 28 (or 29) is press-fitted to the reel shaft 53 at the d portion. Further, in FIG. 7, reference numeral 54 denotes a reel claw, which receives an upward force by a spring (not shown), but is regulated by a stopper claw 28 'of the reel base 28 (or 29). Numeral 55 denotes a reel hub engaged with the reel base 28 (or 29).
Further, reference numeral 28 "denotes a brake press contact portion of the reel base 28 (or 29).

FIG. 9 is a detailed view showing the knurled portion of the press-fitting portion of the reel shaft 53. A knurl 56 for preventing slip-off is partially cut from the press-fit portion d of the reel shaft 53 as shown in the figure. FIG. (A) shows an enlarged cross-sectional detailed view of the knurl portion. This prevents rotation after press-fitting with the reel base 28 (or 29) and prevents the reel base 28 (or 29) from coming off.

Now, in FIG. 7, when the idler gear 31 moves in the direction b in the figure and meshes with the reel base 28 (or 29), its power is transmitted, and the reel pawl 54
Is rotated, and the tape wound therearound is wound up.

As described above, the rotation of the idler gear 31 is performed by the power of the capstan (motor) 3 (FIG. 1).
The transmission is transmitted to the drive gear 30 via the timing belt 41 and the pulley 32, the limiter torque is set by the clutch mechanism of the drive gear 30, and a constant torque is transmitted.

[0040]

As described above, according to the present invention,
It has the following effects: a reel base such as a VTR that performs tape drawing and forward / reverse running does not have a built-in clutch mechanism, has a small number of parts, and has a simple structure.
It is possible to provide a reel base mechanism of a magnetic recording / reproducing apparatus having features such as a reduction in the total thickness of the mechanism and a low cost.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a tape path and a reel driving mechanism in a recording / reproducing state according to an embodiment.

FIG. 2 is a view showing a slide chassis according to the embodiment;

FIG. 3 is a diagram of a driving mechanism on a main chassis of the embodiment.

FIG. 4 is a diagram showing a tape guide driving mechanism according to the embodiment.

FIG. 5 is a main chassis of the embodiment.

FIG. 6 shows a tape path according to the embodiment.

FIG. 7 is a diagram showing a structure of a reel base of the embodiment.

FIG. 8 is a detailed view of a press-fit portion of the reel shaft of FIG. 7;

9 is a detailed view showing a knurled part of a press-fitting part of the reel shaft of FIG. 8;

FIG. 10 is a plan view of an example of a conventional magnetic recording / reproducing apparatus.

11 is a side view of the supply-side reel base driving mechanism in FIG.

12A is an enlarged side view and FIG. 12B is a top view of the supply reel base shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main chassis 2 Drum 3 Capstan 20 Supply side guide post 21 Takeup side guide post 25 Tension post 26 Takeup side drawer post 27 Slide chassis 28 Supply side reel stand 29 Takeup side reel stand 31 Idler gear 51 Reel sleep 52 Reel drive Gear 53 Reel shaft 54 Reel claw 55 Reel hub

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for pulling out a magnetic tape and performing forward / reverse running, comprising: a fixed chassis; and a slide chassis supported to be slidable relative to the fixed chassis. Wherein the slide chassis is disposed between the tape winding section, the brake press-contact section, and the reel base drive gear section, and an idler gear for driving the reel base drive gear includes the fixed chassis and the slide chassis. Magnetic recording, wherein a reel shaft fixed to the reel drive gear portion is press-fitted into the tape winding portion, and wherein the reel shaft has the groove for preventing press-fitting. Reel base mechanism of playback device.