JPH07220339A - Cassette loading mechanism - Google Patents

Abstract

PURPOSE:To smoothly unload a cassette holder by preventing the hooking between the cassette holder and the corner part of a guide hole. CONSTITUTION:A cover opener 1 for opening the cover 60 of the cassette 6 is pivotally supported at the inside of the cassette holder 3 provided between a pair of side plates 2, 2. A protrusion 32 sliding by being fitted to the guide hole 20 on the side plate 2 and guiding the cassette holder 3 between the loading position and unloading position, is projected from the cassette holder 3. The cover opener 1 is pressed by a twist spring 8 in the direction closing the cover 60. At the position where the protrusion 32 comes up to the corner part 20a of the guide hole 20 at the time of unloading, the cover opener 1 is brought into contact with the upper end of an abutting piece 4 projected from the side plate 2 to press the abutting piece 4 downward, and by this reaction, the changeover of the moving direction of the protrusion 32 at the time of unloading is helped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette loading mechanism for loading or unloading a cassette containing a tape to or from a recording / reproducing mechanism, mainly in a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art As such a cassette loading mechanism, the one shown in FIGS.
-5949). In the following description, the cassette loading direction is the front and the cassette ejection direction is the rear.
The mechanism is provided with a pair of side plates (2) and (2) on a chassis (5), and a cassette holder (3) provided between the side plates (2) and (2) so as to be slidable back and forth. Each side plate (2) (2) is provided with three L-shaped guide holes (20) (21) (22) extending in the loading direction.

The cassette holder (3) has protrusions (32), (33) and (34) protruding from both wall plates (31) and (31) of the tray (30) on which the cassette (6) is placed, The cassette holder (3) is horizontally supported by being fitted in the guide holes (20), (21) and (22) of the side plates (2) and (2) corresponding to the respective ones, and the cassette holder (3) is guided in the guide holes (20), (21) and (22). ) Slide along. An arm gear (7) is rotatably provided at the lower end of one of the side plates (2), and one protrusion (34) protruding from the cassette holder (3) penetrates the guide hole (22) to allow the arm gear (7) to rotate.
It is fitted in the long hole (72) opened in the arm (71) of (7).
By rotating the arm gear (7) forward and backward, the cassette holder
(3) moves between the cassette mounting position and the cassette ejection position.

A lid (60) is pivotally supported on the front surface of the cassette (6) as shown in FIG. 4, and is biased in a closing direction by a spring (not shown). When loading the cassette, the lid (6) is lowered by lowering the cassette (6) as shown in FIG.
0) abuts against the protrusion (54) provided upright on the chassis (5) and is pushed up to open around the pivot.

When loading the cassette holder (3),
It moves horizontally along the guide holes (20) (21) (22) and then moves vertically. At the time of unloading, the route opposite to the above is followed. When unloading, the cassette holder (3)
If there is an error in the position of the protrusion (32) or the size of the guide hole (20) provided on the cassette holder (3), the front end of the cassette holder (3) is inclined downward as shown in FIG. In this state, the protrusion (32) is caught in the corner (20a) of the guide hole (20), and the cassette holder
(3) cannot be unloaded. Therefore, the corner (20
a) A bent leaf spring (23) is attached to the descending side in the vicinity, and when the protrusion (32) pushes down the leaf spring (23) and gets over it during unloading, the elastic restoring force of the leaf spring (23) thereafter. Thereby biases the protrusion (32) caught at the corner (20a) rearward.

[0006]

In the above-mentioned conventional example, as shown in FIG.
As shown in FIG. 4 (a), even if the protrusion (32) of the cassette holder (3) is caught in the corner (20a), the protrusion (32) causes the leaf spring (23).
After passing through, the protrusion (32) is biased rearward by the leaf spring (23), so that unloading can be smoothly performed. However, as shown in FIG. 14 (b), it is necessary to slide over the leaf spring (23) while the projection (32) reaches the corner (20a). Therefore, after all, the cassette holder (3) receives a sliding load during unloading, and the cassette holder (3) does not slide smoothly. It is an object of the present invention to reduce the load applied to the cassette holder during unloading and prevent the cassette holder from being caught in the corners.

[0007]

In the cassette loading mechanism, a projection (32) protruding from a cassette holder (3) on which a lid opener (1) is pivotally supported is provided with a guide hole (20) located closest to the cassette loading direction. ) And abut on the lid opener (1) in the cassette descending transition path,
A contact piece (4) that opens the (0) and a spring body that urges the lid opener (1) in the closing direction of the lid body (60) to press the lid opener (1) against the contact piece (4). By the reaction force from the abutment piece (4), at the position where the protrusion (32) reaches the corner portion (20a) which changes the movement in the vertical direction and the horizontal direction at the time of unloading, the moving direction of the protrusion (32). Assist the conversion of.

[0008]

When the cassette is loaded, the lid opener (1) contacts the contact piece (4) at the position where the projection (32) reaches the corner (20a) of the guide hole (20), and the cassette holder (3) The lid body (60) is opened against the spring body with the descending of. The protrusions (32) are
After passing through 0a), the lid opener (1) keeps contacting with the contact piece (4) and keeps the lid body (60) open. When the cassette holder (3) rises during cassette unloading, the lid opener (1) is attached to the contact piece (4) at the position where the protrusion (32) reaches the corner (20a) of the guide hole (20). The cassette holder (3) is lifted by the reaction force of the urging spring body, and assists in changing the moving direction of the protrusion (32).

[0009]

The load applied when the protrusion (32) slides up from the cassette mounting position to the corner (20a) is:
Since there is only friction between the lid opener (1) and the contact piece (4), and there is no mechanism to apply a load in the unloading direction as in the past, the load when unloading the cassette holder (3) is reduced. it can. Since the spring body urges the lid opener (1) to the contact piece (4), the lid opener (1) receives the reaction force and is urged in the cassette ejection direction. At the position where the protrusion (32) reaches the corner portion (20a) during unloading, the lid opener (1) and the cassette holder (3) are pushed in the cassette ejection direction by the biasing force, and the protrusion (32) is in the corner. It is possible to prevent the portion (20a) from being caught.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the chassis (5) has a pair of side plates (2) and (2) provided upright as in the conventional case. Side plate
(2) At the cassette mounting position between (2), the cassette receiving pin
(50) and the rotary cylinder (51) are provided as is known. The chassis (5) is provided with a pair of guide grooves (52) (52). At the rear end of the guide grooves (52) (52), the magnetic tape is pulled out from the cassette (6) and the rotary cylinder (51 The leading guide block (53) to be wound around () is located.

A cassette holder (3) is slidably disposed between the side plates (2) (2) as in the conventional case. As shown in FIG. 2, the long hole (72) of the arm gear (7) is fitted to the protrusion (34) protruding from the cassette holder (3), and the arm gear (7)
The arm portion (71) of the is pushing the insertion detection switch (70).
In this state, the insertion detection switch (70) is ON. The arm gear 7 can be rotated by meshing with a motor or the like, but this is a known technique and will not be described.

Inside the cassette holder (3) is a cassette
A lid opener (1) is provided at a position corresponding to the lid body (60) of (6). The lid opener (1), as shown in FIG.
Keep the distance A approximately equal to the width of the cassette (6),
(2) A pair of side wall plates (10) and (10) opposed to (2) are arranged.
From the lower end of each side wall plate (10), a small mounting plate (11) that contacts the end of the lid (60) is projected, and the front ends of both side wall plates (10) and (10) are connected by a connecting rod (12). is doing.

As shown in FIGS. 1 and 3, each side wall plate (10)
Is the shaft protruding inward from the wall plate (31) of the cassette holder (3)
The lid opener (1) is pivotally supported by (35), and is rotatable about the shaft (35). From each side wall plate (10), project the shaft (1
3) protrudes, and the protruding shaft (13) is attached to the wall plate (3) of the cassette holder (3).
Fit in the circular hole (36) opened in 1). A torsion spring (8) is fitted to the shaft (35) between each wall plate (31) and the side wall plate (10),
One end of the torsion spring (8) is fixed to the cassette holder (3). The other end of the torsion spring (8) is in contact with the protruding shaft (13), and the protruding shaft (13) is connected to the edge (36a) of the arc hole (36) on the counterclockwise side.
Is pressed against.

As shown in FIG. 2, a concave groove (9) is formed inside each side plate (2), and the protruding shaft (13) is formed at the rear end of the concave groove (9) in a cassette loading standby state. positioned. Groove
As shown in FIG. 6 in an enlarged manner, (9) is a horizontal portion (90), an inclined portion (91) that rises diagonally forward from the front end of the horizontal portion (90), and an inclined rearward from the upper end of the inclined portion (91). It has a descending glide (92). As shown in FIGS. 2 and 5, a contact piece (4) is attached to the inside of one side plate (2) in front of the groove (9). The abutment piece (4) is L-shaped and is composed of a support portion (40) that horizontally projects from the inside of the side plate (2) and a vertical portion (41) that extends upward from the tip of the support portion (40). 1) Made of resin or the like that has little friction with When the cassette is mounted, the contact piece (4) holds the lid opener (1) and the lid body (60) open. Details of the holding state and the sliding state of the concave groove (9) of the cassette holder (3) will be described later.

(During loading) As shown in FIG. 2, the cassette (6) is inserted into the cassette holder (3). cassette
The lid body (60) of (6) is fitted into the lid opener (1) and abuts on the connecting rod (12) shown in FIG. This abutment prevents the cassette (6) from passing through the lid opener (1) and hitting the rotary cylinder (51). Push the cassette (6) in to open the lid opener.
Since (1) and the cassette holder (3) slide forward, the arm gear (7) rotates slightly counterclockwise and the insertion detection switch (70) is turned off. A signal from the insertion detection switch (70) causes the arm gear (7) to rotate and the cassette holder (3) to move forward.

As shown in FIG. 6, when the protruding shaft (13) passes through the horizontal portion (90) of the concave groove (9) and slides on the inclined portion (91), the protrusions (32) (33) ( Since 34) is still in the horizontal movement state, the lid opener (1) rotates about the shaft (35) against the torsion spring (8), and the lid body (60) gradually opens. As shown in FIG. 7, the salient shaft (1
When 3) reaches the upper end of the inclined part (91), the protrusions (32), (33) and (34) reach the front ends of the horizontal parts of the guide holes (20), (21) and (22), respectively. In this state, the lid (60) is slightly open, so the mounting plate (1
The lower surface of 1) contacts the upper end of the vertical portion (41) of the contact piece (4). The wall plate (31) of the cassette holder (3) includes a vertical part (41) and a side plate (2).
Fit in the gap with.

The lid opener (1) is provided with a torsion spring (8).
It is pressed against the vertical portion (41) of the contact piece (4) and receives a reaction force from the vertical portion (41), but the turning force of the arm gear (7) is larger than the reaction force, and the protrusions (32) (33). (34) passes through the horizontal part of each guide hole (20) (21) (22) and enters the vertical part. When the protrusions (32) (33) (34) move vertically, the lid opener (1) comes in contact with the upper end of the vertical portion (41) and lowers while opening. The projecting shaft (13) descends the downhill part (92) and allows the lid opener (1) and the lid body (60) to rotate. As shown in FIGS. 8 and 9 (a), when the protrusions (32), (33) and (34) are completely lowered, the lid body (60) is fully opened and the protrusion shaft (1) of the lid opener (1) is opened. 13) is located in the vicinity of the clockwise end of the circular arc hole (36) while being biased counterclockwise by the torsion spring (8). The lid opener (1) is pressed against the side surface of the vertical portion (41) by a torsion spring (8), and the magnetic tape can be pulled out from the cassette (6) in this state.

(Unloading) From the cassette mounting position shown in FIG. 8, the arm gear (7) rotates clockwise and the cassette holder (3) rises along the guide holes (20), (21) and (22). . The lid opener (1) is urged by the torsion spring (8) and rises while coming into contact with the side surface of the vertical portion (41), but as described above, the friction between the lid opener (1) and the contact piece (4) does not occur. Since it is small, the load on unloading is small. When the cassette holder (3) further rises and the protrusion (32) reaches the corner (20a) of the guide hole (20) as shown in FIG. 7, the lid opener is opened.
The mounting plate (11) of (1) and the upper end of the vertical portion (41) are in contact with each other.

The lid opener (1) is pressed against the upper end of the vertical portion (41) by the torsion spring (8). Since the abutment piece (4) is fixed to the side plate (2) as described above, the lid opener (1) receives a reaction force from the abutment piece (4). The lid opener (1) is urged to lift. Therefore, the cassette holder (3) is also lifted and urged via the shaft (35), and the protrusion (32) is
(20a) is biased upward without getting caught and smoothly guide holes
Can move horizontally along (20) (21) (22). The protrusion (32) is shown in Fig. 2.
When the cassette eject position shown in is reached, the arm gear
The arm (71) of (7) pushes in the insertion detection switch (70),
The rotation of the arm gear (7) stops.

At the time of unloading, there is no conventional mechanism for applying a load in the unloading direction from the cassette mounting position to the corner (20a),
Moreover, since the coefficient of friction between the lid opener (1) and the lid body (60) is small, the cassette holder (3) can slide smoothly. At the position where the protrusion (32) reaches the corner (20a) during unloading, the spring body urges the lid opener (1) against the abutment piece (4), and the protrusion (32) is also lifted. It is possible to prevent the protrusion (32) from being caught in the corner (20a) by being biased.

The above description of the embodiments is for explaining the present invention and should not be construed as limiting the invention described in the claims or reducing the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a plan view of a cassette loading mechanism.

FIG. 2 is a side view showing a state in which the above cassette is inserted.

FIG. 3 is a side view of a cassette holder.

FIG. 4 is a perspective view of a lid opener and a cassette.

FIG. 5 is a front view of the cassette loading mechanism.

FIG. 6 is a side view showing a state in which a lid opener is fitted in a groove and slides.

FIG. 7 is a side view showing a state in which the protrusion reaches the corner of the guide hole.

FIG. 8 is a side view showing a cassette mounted state.

9A is a partially enlarged view of FIG. 8, and FIG. 9B is a partially enlarged view of FIG. 7.

FIG. 10 is a side view showing a conventional cassette loading mechanism.

FIG. 11 is a plan view of the above.

FIG. 12 is a side view showing a cassette mounting state of a conventional cassette loading mechanism.

FIG. 13 is a side view showing a state in which the above-mentioned projection is caught in the guide hole.

14A and 14B are enlarged views showing a state in which a protrusion is biased rearward by a leaf spring in a conventional mechanism, and FIG. 14B is a state immediately before the protrusion gets over the leaf spring during unloading. FIG.

[Explanation of symbols]

 (1) Rotation holder (2) Side plate (3) Cassette holder (4) Lid opener (6) Cassette (8) Torsion spring

Claims (1)

[Claims] 1. A cassette opener (1) for pivoting the lid (60) of the cassette (6) in the opening direction is pivotally supported inside the cassette holder (3) into which the cassette (6) is inserted. (3)
Guide along the substantially L-shaped guide holes (20), (21) and (22) formed between the pair of side plates (2) and (2), and the cassette holder (3)
In the cassette loading mechanism in which the protrusion (32) protruding from the guide fits in the guide hole (20) located closest to the cassette loading direction, it is exposed to the cassette descending transition path at the time of loading, and the lid opener (1) Abutment piece (4) that opens the lid body (60) and the lid opener (1) is urged toward the closing direction of the lid body (60) to bring the lid opener (1) into contact with the abutment piece (4). 4) is provided with a spring body that is in pressure contact with, and the protrusion (32) converts the vertical movement and the horizontal movement at the time of unloading by the reaction force from the contact piece (4). The cassette loading mechanism, which assists the change of the moving direction of the protrusion (32) at the position reached to the position.