JP2500718B2 - Loading gear device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading gear device which operates during tape loading of a video tape recorder (hereinafter abbreviated as VTR) and ensures stable running of a cassette tape.

[0002]

2. Description of the Related Art A conventional VTR loading gear mechanism is a loading gear device 100 as shown in FIGS.
And 110, each device 100 (11
0) is generally composed of a gear portion 101 (111), a loading arm 102, and a connecting rod 103.

The gear portion 10 of the loading gear device 100
1, the small-diameter tooth portion 101a and the large-diameter tooth portion 101b are integrally formed, and the base end portion thereof has a loading arm 102.
It is rotatably fitted in the circular hole and is held by the loading arm 102 by the torsion spring 104. The torsion spring 104 at this time is the coil portion 104.
a is externally attached to the gear portion 101, and the hook portion 1
04b is engaged with the engagement piece 102a of the loading arm 102, and the other end hook portion 104c is attached to the gear portion 10.
It is attached by being engaged with the first engaging projection 101c.
The loading arm 102 is connected to a connecting rod 103 via a pivot 105 so as to be relatively rotatable.

Further, the gear portion 111 of the loading gear device 110 is composed of only the large-diameter tooth portion 111a, and is held on the loading arm 102 by the torsion spring 106 in the same manner as the loading gear device 100. At this time, the torsion spring 106 has its coil portion wound in the opposite direction to the torsion spring 104 described above. The loading gear 102 of the loading gear device 110 is also the same as the loading gear device 100 described above.
It is connected to the connecting rod 103 via 5.

Then, these loading gear devices 100
And 110 are assembled into a VTR as shown in FIGS. In the loading gear devices 100 and 110, the gear parts 101 and 111 are mounted on the back surface side of the deck chassis 1 in a state where the large diameter tooth parts 101b and 111a are meshed with each other, and the connecting rods 103 and 103 are respectively connected to the slide bodies. It is pivotally attached to 2, 2. Loading pins 3 and 3 are erected on the front side portions of the slide bodies 2 and 2, and are slidably attached along rails 4 and 4.

In addition, the loading gear device 100 is made to mesh with the small-diameter tooth portion 101a so that the loading lever 5 is engaged.
Is installed. The loading lever 5 is adapted to slide by the driving of a loading motor 6.

In the loading mechanism thus assembled, the loading motor 6 slides the loading lever 5 to reciprocate the loading pins 3 and 3. At the time of tape loading, the cassette tape 8 is wound around the head cylinder 7 by the loading pins 3 and 3, and after the tape loading, the cassette tape 8 is loaded at the loading pins 3 and 3.
By pressing with 3, the cassette tape 8 is run stably. The pressing force at this time is the loading gear device 100,
It is obtained by the torsion springs 104 and 106 of 110. In FIG. 10, reference numeral 9 is a tape cassette, and reference numeral 10 is a cassette reel.

[0008]

However, in the torsion springs 104 and 106, there are large variations among products, and the pressing force of the loading pin 3 against the cassette tape 8 is not constant, so that the conventional loading gear device 100,
110 had a problem that it was difficult to obtain stable running of the cassette tape 8.

Also, the conventional loading gear device 10
No. 0, 110 cannot use a common torsion spring as the torsion springs 104, 106, but use torsion springs opposite to each other in the winding direction, resulting in a large number of parts and poor assembly. Also had.

The present invention has been made in view of the above circumstances, and an object of the present invention is to keep the pressing force of a loading pin against a cassette tape constant to ensure stable running of the cassette tape and to assemble it. The purpose of the present invention is to provide a loading gear device having improved performance.

[0011]

In order to achieve the above-mentioned object, the present invention has a gear portion linked to a loading lever, and a loading arm for holding the gear portion has a loading pin erected through a connecting rod. In a loading gear device connected to a slide body, the gear part and a loading arm are integrally formed, and the loading arm is connected to a connecting rod via a pivot that fits into a long hole axially formed in the arm. And a compression spring is installed in the slot to bias the pivot .
The loading arm is provided with an opening of the elongated hole.
A rib is provided to cover a part and prevent the compression spring from jumping out.
It is characterized by that.

Further , in the above configuration, loading
There are front and back openings in the long hole of the arm.
The ribs should be provided so that they are offset from each other in the opening of the
did.

[0013]

The loading motor slides the loading lever, and the sliding causes the loading arm to rotate via the gear portion. The rotation of the loading arm causes the slide body to slide via the connecting rod. The biasing force of the compression spring is transmitted to the loading pin erected on the slide body via the pivot, and acts so as to press the cassette tape after tape loading with the loading pin.

At the minus part of the slot opening of the loading arm
The ribs provided serve to prevent the compression spring mounted in the elongated hole from popping out and buckling, thereby obtaining a stable biasing force of the compression spring.

[0015]

The present invention will be described in detail below with reference to the illustrated embodiments. The loading gear device 20 shown in FIGS. 1 and 2 corresponds to the conventional loading gear device 100, and the loading gear device 30 shown in FIGS. 3 and 4 corresponds to the conventional loading gear device 110.

The loading gear device 20 includes a gear portion 21.
And a loading arm 22 and a connecting rod 25. The gear portion 21 has a small-diameter tooth portion 21a and a large-diameter tooth portion 21b and is integrally formed. The loading arm 22 is formed of a plate-like member that is formed so as to project from the body of the gear unit 21 on which the large-diameter tooth portion 21b is not formed.
An open long hole 22a is formed on the back surface. The elongated hole 22a is formed substantially along the length direction of the loading arm 22, and the ribs 23 and 24 are displaced in the central portion of the opening portion on the front and back sides so that the ribs 23 and 24 extend in the width direction of the elongated hole 22a. It is provided (see FIG. 5). The gear portion 21 and the loading arm 22 are integrally formed by resin molding.

The connecting rod 25 is formed of a rectangular plate-like member having mounting holes formed at both ends thereof, and is attached to the loading arm 22 by a pivot 26 penetrating through the elongated hole 22a and attached to the mounting hole of the connecting rod 25. Be connected. In this connected state, the loading arm 22 is movable back and forth with respect to the pivot 26 along the elongated hole 22a.

The compression spring 27 is mounted in the elongated hole 22a of the loading arm 22 in the connected state. The attached compression spring 27 has one end in contact with the pivot shaft 26, the other end in contact with the side wall of the elongated hole 22a on the side where the gear portion 21 is formed, and the central portion is prevented from protruding outward by the ribs 23, 24. It has been blocked.

The loading gear device 30 includes a gear portion 31.
The loading arm 32 and the connecting rod 35 are substantially configured, and the linkage of each element is the same as that of the loading gear device 20. That is, the gear portion 31 is formed with the large-diameter tooth portion 31a, and the loading arm 3
2 is integrally formed with the loading arm 3
2 and the connecting rod 35 are connected by a pivot 36.
At this time, the compression spring 37 is formed in the loading arm 32 in the same manner as the loading gear device 20, and is formed in the elongated hole 32a.
It is mounted inside and presses and biases the pivot 36.

Then, these loading gear devices 20
Nos. 30 and 30 are mounted at the positions of conventional loading gear devices 100 and 110 shown in FIGS. 10 and 11, respectively. That is, the loading gear devices 20 and 30 pivotally attach the respective gear parts 21 and 31 to the rear surface side of the deck chassis 1 while the large-diameter tooth parts 21b and 31a are meshed with each other.
The connecting rods 25 and 35 are pivotally attached to the slide bodies 2 and 2, respectively. In addition, the loading gear device 20
The loading lever 5 is attached to the small-diameter tooth portion 21a so as to be meshed therewith.

The loading gear devices 20 and 30 assembled in the deck chassis 1 in this way operate as follows. The loading motor 6 causes the loading lever 5 to slide, and the sliding causes the loading arms 22 and 32 to rotate via the gear portions 21 and 31. By the rotation of the loading arms 22 and 32, the slides 2 and 2 slide along the rails 4 and 4 via the connecting rods 25 and 35. And when loading tape, slide body 2,
The cassette tape 8 is wound around the head cylinder 7 by the loading pins 3 and 3 provided upright at 2, and the cassette tape 8 is pressed by the loading pins 3 and 3 after the tape loading to ensure stable running of the cassette tape 8. The pressing force at this time is the loading gear device 20, 3
Since it is obtained by the zero compression springs 27 and 37, it is stable and contributes to the stable running of the cassette tape 8. In the embodiment described above, the loading arm
Both the front and back of the long hole were released to form an opening.
The opening may be formed on only one side.

[0022]

In the loading gear device of the present invention, the pressing force of the cassette tape is obtained by the compression spring having a smaller product variation than the torsion spring, so that the running of the cassette tape can be further stabilized. it can.
Also, the loading arm and the gear part are integrally formed,
Moreover, the compression spring common to the left and right loading gear devices can be used , and the long hole of the loading arm can be used.
Since the rib is provided in a part of the opening, the assembling property becomes good and the stable operation can be realized. Furthermore, Rohde
When opening the front and back of the long hole of the swing arm,
If ribs that are offset from each other are provided on the front and back, the
Can be attached and disassembled, and the compression spring can buckle or fly.
Stable operation because it does not stick out.

[Brief description of drawings]

FIG. 1 is a plan view of one loading gear device according to the present invention.

2 is a side view of the one loading gear device of FIG. 1. FIG.

FIG. 3 is a plan view of the other loading gear device according to the present invention.

FIG. 4 is a side view of the other loading gear device of FIG.

5 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 6 is a partially cutaway plan view of one conventional loading gear device.

FIG. 7 is a side view of the one loading gear device of FIG.

FIG. 8 is a partially cutaway plan view of the other conventional loading gear device.

9 is a partially cutaway side view of the other loading gear device of FIG. 8. FIG.

FIG. 10 is a plan view on the front surface side of the deck chassis for explaining the mechanical portion of the VTR.

FIG. 11 is a plan view of the back side of the deck chassis for explaining the mechanism of the VTR.

[Explanation of symbols]

 1 Deck Chassis 2 Slide Body 3 Loading Pin 5 Loading Lever 20, 30 Loading Gear Device 21, 31 Large Diameter Tooth 22, 32 Loading Arm 22a, 32a Long Hole 23, 24 Rib 25, 35 Connecting Rod 26, 36 Pivot 27, 37 Compression spring

Claims (2)

(57) [Claims] 1. A loading gear device in which a gear part is linked to a loading lever, and a loading arm for holding the gear part is connected to a slide body on which a loading pin is erected via a connecting rod. An arm is integrally formed, the loading arm is connected to a connecting rod via a pivot that fits into an elongated hole formed in the arm in the axial direction, and a compression spring has a pivot in the elongated hole. It is mounted so as to urge, and the loading arm has the long
Prevents the compression spring from protruding by covering part of the opening of the hole
A loading gear device characterized in that a rib is provided . 2. The front and back openings in the elongated hole of the loading arm.
The front opening and the back opening
The loading gear according to claim 1, wherein the ribs are provided so as to be displaced from each other.
apparatus.