JP3037103B2 - Tape loading mechanism and method of assembling the mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape loading mechanism for extracting a magnetic tape from a cassette in a magnetic recording / reproducing apparatus, and more particularly to a structure in which a leading guide block and a loading link are assembled and a method of assembling the same. is there.

[0002]

2. Description of the Related Art There are the following tape loading mechanisms. As shown in FIG. 8, the mounting position of the rotating cylinder (not shown) on the chassis (1) is
And a pair of guide grooves (12) (12) extending toward the loading standby position on both sides of the opening (14). A leading guide block (5) for drawing out the tape from the cassette is slidably fitted in each guide groove (12), and the end of the guide groove (12) on the loading direction side is enlarged, and the leading guide block (5) is enlarged. ) Is formed into a window hole (13) into which the hole is inserted. Each leading guide block (5) is driven by a loading link (7) provided on the rear surface of the chassis (1). The loading link (7) includes a pivot lever (71) fitted on a pivot (10) protruding from the rear surface of the chassis (1), and a link plate (72) fitted on the leading guide block (5). The opening (14) and the window holes (13) (13) are covered by a cylinder base (60) which is a support for the rotary cylinder. The cylinder base (60) integrally includes a catcher (3) (3) to which the leading guide block (5) is crimped and a mounting table (6) on which the rotating cylinder is mounted.
Attachment base (6) at (14) and catcher (3) at window holes (13) (13)
(3) is covered respectively.

In order to attach the leading guide block (5) to the chassis (1), first, the leading guide block (5) is inserted into the window (13).
(5) is fitted, and once returned to the loading standby position along the guide groove (12). A support piece (93) is provided on the lower surface of the leading guide block (5), and the support piece (93) supports the tip of the link plate (72) as described later. Next, as shown in FIG. 9, the chassis (1) is turned over, and the jig (8) is put on the window (13). The jig (8) is provided with an auxiliary guide groove (80) which is continuous with the guide groove (12). After the jig (8) is mounted, the leading guide block (5) is advanced again as shown in FIG. And make contact with the tip of the auxiliary guide groove (80). Loading link (7)
Are arranged so that a center line L1 connecting the pivot portion of the rotating lever (71) and a center line L2 connecting the pivot portion of the link plate (72) form approximately 180 °, and the link plate (72) is connected to the leading guide block. (5)
Then, the turning levers (71) are fitted to the pivots (10), respectively. Link board
(72) is inserted without being disturbed by the support piece (93). If the leading guide block (5) and the loading link (7) are to be mounted without using the jig (8), the leading guide block (5) falls out of the window hole (13). A tool (8) is required.

[0004] As shown in FIG.
(7) is rotated to return the leading guide block (5) to the loading standby position. The tip of the link plate (72) is a support piece (93)
Between the loading link (7) and the guide block when vibration is applied from the outside
(5) is prevented from coming off (see JP-A-6-338110). Thereafter, the jig (8) is removed from the chassis (1), and the cylinder base (60) is put on the window (13) and the opening (14).

[0005]

Conventionally, a jig is used.
Since the leading guide block (5) and the loading link (7) are attached by using (8), it is troublesome and workability is poor. Also, when the jig (8) is removed after the leading guide block (5) is attached to the chassis (1), the loading link (7) rotates when the chassis (1) is transported, and the leading guide block (5) is rotated. May come off. By the way, in view of reduction of manufacturing cost, the applicant has proposed to form the mounting base 6 by drawing of the chassis 1 (see Japanese Utility Model Publication No. 64-2319). In this case, the mounting base (6)
A separate catcher (3) must be provided. Anyway,
If the mounting base (6) is provided by drawing, the periphery of the mounting base (6) is easily distorted, so in order not to distort the window (13),
It is necessary to provide a large space between the window hole (13) and the mounting base (6). Therefore, it is necessary to change the size and arrangement position of the window hole (13) from the past. The applicant takes advantage of the need to change the window (13) and uses the leading guide block (5) and the loading link.
The idea was to improve the workability of the assembly in (7). SUMMARY OF THE INVENTION It is an object of the present invention to provide a loading mechanism that can assemble a leading guide block and a loading link without using a jig, and that does not separate the leading guide block from the chassis during transportation of the chassis.

[0006]

[Means for Solving the Problems] In the leading guide block (5)
Is inserted into the chassis (1) through the window (13)
(1) A stopper piece (95) is provided on the back surface, which can be abutted, and is opened continuously on the chassis (1) in the guide groove (12), and a window hole (5) in which the leading guide block (5) can be inserted. 13) is a rotating lever (7
In the state where the center line L1 connecting the pivot portions of 1) and the center line L2 connecting the pivot portions of the link plate (72) extend straight in the loading direction, the loading is further performed than the tip of the link plate (72). Opened on the direction side, linked with the rotating lever (71)
The plate (72) extends straight in the loading direction
In this state, the retaining piece (95) comes in contact with the back of the chassis (1).
The guide block (5) falls off the chassis (1)
prevent.

[0007]

[Operation and Effect] The window hole (13) is aligned with the center line L1 connecting the pivot of the rotating lever (71) and the center line L2 connecting the pivot of the link plate (72). The link plate (72) is provided on the loading direction side of the tip of the link plate (72). Therefore, the leading guide block (5) and the loading link
To install (7), insert the guide block (5) into the window hole.
After being inserted into (13), it must be pulled back toward the loading standby position along the guide groove (12). Anyway,
Once the leading guide block (5) and loading link (7)
Once the guide block (5) is installed
There is no risk of falling off from (13). Therefore, the leading guide block (5) and the loading link (7) are used without using a jig.
Can be attached, and workability is improved. Also a leading guide
Block (5) and loading link (7) attached
In the state, the retaining piece (95) contacts the back of the chassis (1),
The leading guide block (5) falls off the chassis (1).
And prevent. Therefore, after attaching the leading guide block (5) and the loading link (7), the loading link
Even if the (7) is rotated, the leading guide block (5) does not come off the chassis (1), so that the workability in transporting the chassis (1) can be improved.

[0008]

FIG. 1 is a plan view of a chassis (1). A pair of guide grooves (12) and (12) are opened on the side of the mounting base (6) provided by drawing, and both ends of the guide grooves (12) and (12) on the mounting base (6) side. Is enlarged to form a window hole (13).
A leading guide block (5) for pulling out the magnetic tape from the cassette is slidably fitted in each guide groove (12), and the window hole (13) is opened further in the loading direction than the loading completion position. I have. On the rear side of the chassis (1), in the vicinity of the mounting table (6), pivots (10) (10), which are the rotation centers of the loading links (7), (7), are erected as in the prior art.

The leading guide block (5) is shown in FIGS.
As shown in the figure, a guide roller (51) and an inclined pin (50) are attached to one end of a base (9) made of PPS (polyphenylene sulfide) resin.
This is a known configuration including The guide roller (51) is
The second shaft (91) projects from the lower surface of the base (9) concentrically with the first shaft (90). Base
A boss (92) projects from the lower surface of the other end of (9), and the boss (92)
A retaining piece (95) is provided between the boss (92) and the second shaft (91) at right angles to a center line connecting the boss (92) and the second shaft (91). The right end of the retaining piece (95) projects toward the boss (92), and the supporting piece (9) for receiving the tip of the loading link (7) as in the related art.
Form 3).

At the tip of the link plate (72) of the loading link (7), a fitting tube (70) is formed upward by drawing, and the fitting tube (70) fits into the boss (92). . As shown in FIG. 1, a loading gear (73) is concentrically attached to a rotating lever (71) connected to a link plate (72), and loading links (7) and (7) are attached to a chassis (1). In this state, the two gears (73) (73) mesh with each other. One gear (73)
Rack mechanism (not shown) meshes with the loading link
(7) (7) is driven to rotate.

To attach the leading guide block (5) to the chassis (1), as shown in FIG. 4, the retaining piece (95) is aligned with the window (13), and the leading guide block (5) is attached to the chassis.
Then, the lower surface of the base (9) is brought into contact with the surface of the chassis (1), and the upper surface of the retaining piece (95) is brought into contact with the lower surface of the chassis (1). Thereafter, as shown in FIG. 5, once the leading guide block (5)
Slightly along the guide groove (12). Retaining piece (95)
Is in contact with the rear surface of the chassis (1), so that the leading guide block (5) is prevented from falling off from the chassis (1). Next, the link plate (72) of the loading link (7) and the rotating lever
The link plate (72) is in a state where the pivot joint of (71) is reversed, that is, the pivot joint is located inside the imaginary line M connecting the pivot (10) and the boss (92). To the boss (92), the rotating lever
Attach (71) to pivot (10). The tip of the link plate (72)
It fits on the boss (92) without being disturbed by the support piece (93).
Both loading gears (73) (73) mesh with each other and pivot (10)
Fits in (10).

Next, as shown in FIG. 6, the rotating lever (71)
The pivoting lever is positioned so that the center line L1 connecting the pivots of the link plate and the center line L2 connecting the pivots of the link plate (72) are aligned.
Turn (71) slightly counterclockwise. Although the leading guide block (5) slides slightly in the loading direction, the retaining piece (95) does not reach the window (13), and the leading guide block (5) does not reach the window hole (13).
(5) does not fall out of the chassis (1). Further, as shown in FIG. 1, the rotation lever (71) is rotated to return the leading guide block (5) to the loading standby position. The distal end of the link plate (72) fits on the support piece (93) to prevent the loading link (7) from coming off the leading guide block (5).

Finally, as shown in FIG. 7, a catcher (3) is attached so as to cover the window (13). Catcher (3)
Is fixed by screwing a screw (36) to the chassis (1). The catcher (3) has a well-known configuration including a holding piece (31) with which the leading guide block (5) comes into contact. When the catcher (3) is mounted, the holding piece (31) is attached to the window (13). ) Is located on the loading standby position side. A rotary cylinder (not shown) is mounted on the mounting base (6), and a leading guide block (5) is pressed against the catcher (3), and the tape is wrapped around the peripheral surface of the rotary cylinder. Done.

The window hole (13) is, as described above, a pivot lever (71).
When the center line L1 connecting the pivot portions of the link plate and the center line L2 connecting the pivot portions of the link plate (72) are aligned,
It is opened on the loading direction side of the tip of (72). Therefore, to attach the leading guide block (5) and the loading link (7), the leading guide block (5)
After being inserted into the window hole (13), it must be pulled back along the guide groove (12) toward the loading standby position, and there is no possibility that the leading guide block (5) will fall out of the window hole (13). Therefore, without using a jig, the leading guide block
(5) and loading link (7) can be attached, and workability is improved. After attaching the leading guide block (5) and the loading link (7),
Even if the (7) is rotated, the leading guide block (5) does not come off the chassis (1), so that the workability in transporting the chassis (1) can be improved.

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state where a leading guide block is located at a loading standby position on a chassis.

FIG. 2 is a side view of a leading guide block.

FIG. 3 is a plan view of the same.

FIG. 4 is a plan view showing a state in which a retaining piece of a leading guide block is aligned with a window hole.

FIG. 5 is a view showing a state in which a leading guide block is slightly returned toward a loading standby position by cutting a part of a chassis.

FIG. 6 is a view showing a state in which a link plate and a pivotal support portion of a rotary link are located on a straight line, with a part of the chassis cut away.

FIG. 7 is a plan view showing a state where a catcher is attached to a chassis.

FIG. 8 is a plan view of a conventional catcher and chassis.

FIG. 9 is a plan view showing a state where a conventional chassis is inverted and a jig is attached.

FIG. 10 is a plan view showing a state where a loading link is attached to a leading guide block fitted to the chassis.

[Explanation of symbols]

 (1) Chassis (3) Catcher (5) Leading guide block (7) Loading link (12) Guide groove (13) Window hole (71) Rotating lever (72) Link plate

Claims (2)

(57) [Claims] 1. A guide groove (1) formed on a chassis (1).
2) A pair of leading guide blocks (5) and (5) that are slidably fitted in the cassette and pull out the tape from the cassette, and the chassis (1).
A loading link (7) (7) that is rotatably provided on the top and slides a leading guide block (5); and a chassis (1)
The loading link (7) is rotatably fitted to the chassis (1), provided with a catcher (3) (3) to which the leading guide blocks (5) and (5) are crimped, which are arranged at the upper loading completed position. A rotation lever (71), a link plate (72) pivotally connected to a free end of the rotation lever (71), and a leading guide block (5) rotatably fitted to the free end; Chassis
(1) In the tape loading mechanism, on which a leading guide block (5) can be inserted, covered by a catcher (3), and a window (13) continuous with the guide groove (12) is opened, The leading guide block (5) is inserted into the chassis through the window (13).
A stopper that can be inserted into (1) and contact the back of the chassis (1)
A window (13) is provided on the center line L1 connecting the pivotal support of the rotating lever (71).
With the center line L2 connecting the pivots of the link plate (72) extending straight in the loading direction, the link plate (7
2) It is opened further in the loading direction than the tip of
The rotating lever (71) and the link plate (72) are in the loading direction.
With the retaining piece (95) in a straight line
The leading guide block (5) comes into contact with the back of the
A tape loading mechanism characterized in that the tape loading mechanism prevents the tape from dropping out of the cassette (1) . 2. A guide groove (12) into which a leading guide block (5) for extracting a tape from a cassette is slidably fitted.
And a chassis (1) having a window (13) connected to the guide groove (12) closer to the loading direction than the loading completed position, and the leading guide block (5) is connected to the window (13).
(13), and insert the leading guide block (5) into the guide groove (1).
(2) a step of slightly retracting along the link plate (72) of the loading link (7) and the rotating lever (7).
A step of fitting the link plate (72) to the leading guide block (5) and a pivot lever (71) to the pivot (10), respectively, in a state where the pivot connection portion of (1) is reversely folded; The center line L1 connecting the pivots of (71) and the link plate (7
The pivoting lever (71) is pivoted (10) until the center line L2 connecting the pivots of (2) is arranged in a straight line and the leading guide block (5) is arranged in front of the window (13). And rotating the rotating lever (71) further to rotate the leading guide block.
(5) A method of assembling a tape loading mechanism, comprising the steps of: returning the (5) to the loading standby position; and attaching the catcher (3) so as to cover the window (13).