JPH0229544Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a pinch roller crimping device for a magnetic recording/reproducing device that pulls out a tape from a cassette and performs a required operation.

[Background technology and its problems] Conventionally, tapes were pulled out from cassettes for recording/recording.
The mechanism shown in FIG. 1 is often used as a pinch roller pressing device in a tape recorder that performs playback. In the figure, 1 is a base, 2 is a magnetic tape, 3 is a cassette containing the wound magnetic tape 2 and has an opening in a part, such as a video cassette, and 4 and 5 are cassettes on which the magnetic tape 2 is wound. The reels 6 and 7 are the reels that rotate reels 4 and 5.
Motors 8 and 9 are fixed to the base 1 with guide pins. 10 is a loading plate that can slide on the guide pins 8 and 9; 11 is a motor for sliding the loading plate 10; it is attached to the base 1; a pinion 12 is attached and fixed to the shaft of the motor 11; Since the pinion 12 is engaged with a rack formed on the loading plate 10, the loading plate 10 slides against the guide pins 8 and 9 via the pinion 12 when the motor 11 rotates.
When the cassette 3 is inserted into the recording/playback device, the pinch rollers 13 and 14 are located inside the cassette 3 (indicated by the two-dot chain line), and when the record or playback button is pressed, the pinch rollers 13 and 14 are The magnetic tape 2 is pulled out to a standby position (position drawn with a solid line) close to the capstans 15 and 16. At this time, plunger solenoids 17, 18
When energized, the iron cores 19, 20 are attracted, and the suction action causes the pinch arms 23, 24 to rotate around the fulcrums 25, 26 via the connecting rods 21, 22, and the pinch rollers 13, 14 are moved to the capstan. 15 and 16. Since the stroke of the plunger solenoid is limited, the distance from the fulcrum 25, 26 to the point of application (axis of the pinch rollers 13, 14) is the distance from the fulcrum 25, 26 of the pinch arms 23, 24 to the point of application (axis of the pinch rollers 13, 14). must be relatively small. This necessarily means that, due to the principle of leverage, a large force must be applied to the point of force in inverse proportion to the ratio of the distances mentioned above, thus requiring a large capacity, large, and heavy plunger solenoid. I will do it.

It is also conceivable to use a toggle link as shown in FIG. Although the use of such a toggle link reduces the force required of the plunger solenoids 17, 18, the plunger stroke S becomes relatively large, still requires a long solenoid, and requires a lateral Therefore, no great effect can be expected for miniaturization and weight reduction.

[Purpose of the invention] The purpose of the invention is to develop a compact, small-impact,
An object of the present invention is to provide a pinch roller crimping device that can be driven by a small-capacity plunger solenoid.

[Summary of the invention] In order to achieve the above object, the pinch roller crimping device according to the invention has a first a moving mechanism that expands and contracts the toggle link mechanism by moving the toggle link mechanism in a direction, a left and right fulcrum adjustment arm that allows the fulcrum of the toggle link mechanism to move in a second direction with respect to a first direction, and a pinch - The main feature is that it includes left and right plunger solenoid mechanisms that apply pressure to the fulcrum adjustment arm in the direction of pressing the roller against the capstan.

Hereinafter, the present invention will be explained in detail using examples with reference to the drawings, but these are merely illustrative and it is understood that various modifications and improvements may be made without going beyond the scope of the present invention. Of course.

[Embodiment] FIG. 3 is a plan view of an embodiment of the pinch roller crimping device according to the present invention, which is suitable for magnetic recording and reproducing devices such as tape recorders. represents a portion corresponding to that in FIG. The right half of Figure 3 shows the operating range from the pinch roller return position (indicated by the solid line) to the standby position (indicated by the dashed line), and the left half shows the operating range from the standby position to the pinch roller return position (indicated by the dashed line). The process in which the roller is pressed against the capstan is shown.

In FIG. 3, 27 is a tape loading motor, 28 is a worm gear, 29 is a rack slider, and 29' is in its standby position.
30 and 31 are toggle arms, 32 and 33 are connection pins attached to the toggle arms 30 and 31, respectively, 34 and 35 are toggle links, 36 and 37 are pinch arms, and 38 and 39 are crimping force adjustment springs. ,
Numerals 40 and 41 are fulcrum adjustment arms whose leverage ratio is, for example, approximately 5:1.

The motor 27 is adapted to drive a worm gear 28, and a rack portion of a rack slider 29 is engaged with the worm gear 28.
The rack slider 29 is provided on the base plate of the device so as to be movable back and forth, and the connecting pins 3 of the toggle arms 30 and 31 are located in the left and right elongated holes of the rack slider 29.
2 and 33 are loosely fitted.

Plunger solenoids 17 and 18 are easy to use.
The iron cores 19 and 20 of each sonoid are connected to one end of a connecting plate 21 and 22, and one end of a pair of rotatably supported fulcrum adjustment arms 40 and 41 are arranged symmetrically with respect to the slider. Crimping force adjustment spring 3
It engages with the other ends of the connecting plates 21 and 22 via 8 and 39.

The other ends of the fulcrum adjustment arms 40, 41 are the toggle arms 30, 31 forming the toggle link mechanism at the fulcrums 45, 46 of the toggle link mechanism.
The toggle arms are pivotally connected to one end and the other ends of the toggle arms are connected to the midpoints 47, 4 of the toggle linkage.
At 8, the toggle link 34,3 is rotatably connected.
5, and these toggle and
The other ends of the links are pivotally engaged with pinch arms 36,37.

Pinch arms 36 and 37 are rotatably supported and have pinch rollers 13 and 14 supported at one end of each.

In addition, in the embodiment, the pinch roller 13,
14 and the pinch arms 36 and 37 form a pinch roller mechanism, and the tape loading motor 27, worm 28, and rack slider 29 form a moving mechanism for expanding and contracting the toggle link mechanism. In addition, plunger solenoids 17, 18, iron cores 19, 20, and connecting plates 21, 22
and the pressing force adjustment springs 38 and 39 form a plunger solenoid mechanism.

As shown in the figure, when the cassette 3 is loaded into the recording/playback device, the tape loading motor 2
7 rotates (not shown) and rotates the worm gear via a suitable reduction gear.
Then, the rack sliders 29, 29' engaged with the worm gear 28 move linearly in the direction of arrow 42, causing the connecting pins 32 and 33 to move in the direction of arrow 4.
Push in directions 3 and 44. Connecting pins 32, 33
The toggle arms 30, 31 pivot together in a first direction of movement indicated by arrow 49, extending the toggle links 34, 35 which engage them at 47, 48 of the midpoint toggle linkage. At a point slightly past the dead center, the connecting pins 32 and 33 hit the walls of the long holes provided on the left and right sides of the rack slider 29,
This restricts the movement of the pin and toggle arm 3
The pinch roller standby position (the position indicated by the one-dot chain line) is where the rollers 0 and 31 do not advance any further and are in a semi-fixed state. Through the operations up to this point, the tape is pulled out from the cassette by the pinch rollers 13 and 14 and brought close to the capstans 15 and 16. This toggle regulation (overshoot prevention) can also be provided separately from this elongated hole.

At this time, plunger solenoids 17 and 18 are energized to attract iron cores 19 and 20. Therefore, the connecting plates 21 and 22 are pulled, and the crimping force adjustment spring 3
8, 39 to the fulcrum adjustment arms 40 and 41
rotate each. Then, the fulcrums 45 and 46 of the toggle link mechanism at both ends of the fulcrum adjustment arms 40 and 41 are oriented in the moving direction shown by the arrow 50,
The forces are applied to toggle arms 30, 31, toggle linkage midpoints 47, 48 and toggle link 3.
Pinch arms 36, 37 via 4, 35 in turn
is transmitted to the pinch rollers 13 and 14 with a corresponding force.
are crimped onto the capstans 15 and 16. Fulcrum adjustment arms 40, 41 and pinch arms 36, 37
The overall leverage ratio is approximately 5/1 x 1/2 = approximately 2.5/1,
Approximately 2.5 times more pinch roller pressure than a plunger solenoid can be obtained.

FIG. 4 shows the worm gear 28, rack slider 29, toggle arms 30, 31, used in the pinch roller crimping device according to the present invention.
FIG. 3 is a plan view showing the specific shape of fulcrum adjustment arms 40 and 41. FIG. The stroke from the pinch roller standby position to the crimping position is designed to be, for example, approximately 1 mm, and therefore the stroke of the plunger solenoid is 1×2.5/1=approximately 2.5 mm. This value itself is quite small. Therefore, according to the present invention, both the plunger solenoid attraction force and the impact length can be made quite small, and the recorder main body can be made small and lightweight. Furthermore, since the current required for adsorption is small, power consumption is also low. Note that although a self-holding type (using a permanent magnet) plunger solenoid is used in the above embodiment, the present invention is not limited to this.

[Effect of the invention] As explained above, according to the invention, large-sized,
Since a large-capacity, heavy-weight plunger solenoid is used, the drawbacks of the conventional technology, such as the large size, weight, and power consumption of the main body of the device, are overcome, and there is no need to expand the main body of the device in the horizontal direction. By making the tape drive mechanism smaller, lighter, and thinner, the degree of freedom in configuring the entire device increases, resulting in a thin, front-operated data recorder that has never been seen before in a data recorder that uses this type of video cassette. The advantage is that a (front-loading) data recorder can be realized.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a tape feeding mechanism equipped with a conventional pinch roller crimping device, Fig. 2 is a plan view of a toggle link mechanism in a conventional pinch roller crimping device, and Fig. 3 is a plan view of a tape feeding mechanism equipped with a conventional pinch roller crimping device. A schematic plan view of the roller crimping device, FIG. 4 shows the worm gear of the pinch roller crimping device according to the present invention;
FIG. 3 is a plan view showing the specific shapes of the rack slider, toggle arm, and fulcrum adjustment arm. 1... Base, 2... Magnetic tape, 3... Cassette, 4, 5... Reel, 6, 7... Reel motor, 8, 9... Guide pin, 10... Loading plate, 11... ... Motor for sliding the loading lever, 12 ... Pinion attached to the shaft of motor 11, 13, 14 ... Pinch roller, 15, 16 ... Capstan, 1
7, 18... Plunger solenoid, 19, 2
0... Iron core, 21, 22... Connection rod, 23,
24...pinch arm, 25,26...fulcrum,
27... Tape loading motor, 28...
...Worm gear, 29...Rack slider,
30, 31... Toggle arm, 32, 33...
Connecting pin, 34, 35...Toggle link, 3
6, 37... Pinch arm, 38, 39... Crimping force adjustment spring, 40, 41... Fulcrum adjustment arm,
42...Arrow indicating the direction of movement of the rack slider, 43, 44...Arrow indicating the direction of force applied to the connecting pin, 45, 46...Toggle arm fulcrum (fulcrum of the toggle link mechanism), 47, 48 ... Junction point of the toggle arm and toggle link (midpoint of the toggle linkage), 49... Arrow indicating the first direction of movement of the toggle linkage, 50... Second point of movement of the toggle linkage An arrow indicating the direction of movement.

Claims (1)

[Scope of utility model registration request] In a magnetic recording/reproducing device, left and right pinch roller mechanisms pressed against a capstan by a toggle link mechanism and a midpoint of the toggle link mechanism are moved in a first direction to expand and contract the toggle link mechanism. a mechanism, a left and right fulcrum adjustment arm that allows the fulcrum of the toggle link mechanism to be moved in a second direction with respect to the first direction, and a pinch roller that is movable in a direction that presses the pinch roller against the capstan via the toggle link mechanism. A pinch roller crimping device comprising left and right plunger solenoid mechanisms that apply pressure to the fulcrum adjustment arm.