JPS581885Y2 - Cassette attachment mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cassette holder mounting mechanism that pursues a good feeling in mounting operation.

Most cassette holder mounting mechanisms increase the resistance force in the return direction as the cassette is mounted, and when the cassette holder exceeds the locking point, it returns to the return direction and locks. The overstroke caused by this not only causes play in the cassette installation, but also makes the installation operation feel uncomfortable (XJ).

Therefore, in consideration of the above-mentioned points, the present invention gradually reduces the drag force of the cassette holder as the cassette is installed, and when the cassette holder reaches the locking point, it is urged toward the locking point, thereby ensuring that the cassette is firmly attached to the reel stand. The purpose of this paper is to specifically propose a new mounting mechanism that improves the feel of the mounting operation and eliminates overstroke.

An illustrative embodiment of the present invention will be described below.

The main components of this embodiment are: a loading disk 1 for loading the tape; a retracted position detecting means 2 for detecting the retracted position of the loading disk 1; A first swinging rod 3 that swings on a parallel plane, a second swinging rod 4 that is pivotally supported on the first swinging rod 3 and can freely swing in the vertical direction; a lock plate 5 that locks a guide roller fixed to the tip;
a first pinion 6 that engages a pin in a long through hole formed in the side surface of the second swinging rod 4 and guides the second swinging rod 4 up and down as it rotates; A second pinion 6' disposed at the other end of the shaft 61 fixed to one end and the cassette holder H are held between the first and second pinions 6.6.
a first rack plate 7 and a second rack plate 7' that engage with the rack plates 7 and 7' and move up and down, and a first guide post 8 that supports the first and second rack plates 7 and 7' in a vertically movable manner and bears a shaft. and released from the second kitebost 8'.

In addition, both the pinions 6t6'sW and the rack plates 7, 7'
Both guide posts 8, 8' are integrally molded from synthetic resin.

The specific configuration of each component will be described in detail below.

(a) The loading disc 1 is approximately 2
Three support rollers 1 arranged on the first substrate B1 tilted at 0°
The inner periphery is supported by 0... (only one is shown in Figure 1), and the gear can be rotated by meshing with a gear formed at the lower part of the outer periphery and a gear fixed to the 1 drive motor (both not shown). has been done.

On the upper surface, there is provided a leading guide 11 for drawing out the tape, a support shaft 14 that rotatably supports a support lever 13 that rotatably supports a pinch roller 12, and a return path that follows the leading guide 11 and when the tape is loaded. Two guides guide the tape (
(not shown) are arranged.

Furthermore, a notch 15 is provided on the outer periphery at a position facing the retracted position detection means 2.

(See FIGS. 1 and 2) (b) The retracted position detection means 2 comprises a first base plate B1 and a metal fitting 21 which is swingably supported on a pivot shaft 20 and is stretched between the first base plate B1 and the first base plate B1. The spring (locking biasing means) 22 rotates and biases counterclockwise to bring one end 23 into contact with the first swinging rod 3, and the swinging roller 24 is opposed to the notch 15 of the loading disc. It is arranged.

The swing roller 24 is fitted into the notch 15 to restrict rotation of the loading disk 1 except when the cassette is mounted.

(See Figures 1 and 2) (c) The first swinging rod 3- is
It is swingably supported on a first support shaft 30 set on a second board B2 parallel to the base, and the bent portion 31 is biased to the right by a second spring (locking biasing means) 32. The eject lever 9 is brought into contact with the end of the eject lever 9, and is biased to rotate clockwise about the first support shaft 30.

The first swinging rod 3 is biased counterclockwise by the traction force of the third spring 33 only when the eject lever slides once to the left in conjunction with an eject button (not shown).
The swinging roller 24 in the retracted state is urged toward the notch 15 side.

(See FIGS. 1 and 2) The second swinging rod 4 is pivoted on a second support shaft 40 that is loosely fitted into the first support shaft 30 and fixed to the side surface of the first swinging rod 3. The second pinion is supported by an engagement pin 60 which is fixed to the second pinion and engages with a long hole 41 on the side plate. 1st
It is biased downward by a fourth spring (biasing means for adjusting drag force) 44 stretched between the swinging rods 3.

(See FIGS. 1 to 3) (t) The locking plate 5 has an engaging notch 50 formed with an inclined portion 51 for guiding the roller in the upper portion thereof in order to smoothly guide and lock the guide roller 42. (see FIG. 8), and is fixed on the second substrate B2.

Therefore, the guide roller 42 is located slightly above the inclined portion 51 when the cassette is detached, and is guided so that it can engage the engagement notch 50 only when the cassette is attached (see FIGS. 1 to 3 and (See Figure 8) (f) The pinion 6 reciprocates by a little less than 1800 degrees as the first rack plate moves up and down, and the engagement pin 60 moves the first and second swinging rods 1. Guide students.

That is, 0 when the cassette is removed. The engagement pin 60 located on the E line (FIG. 4) deflects the first swinging rod 3 counterclockwise and positions the second swinging rod 4 slightly upward, so that the cassette mounting operation is not performed. Accordingly, the second swinging rod is guided upward and then downward, and when the engagement pin 60 approaches the 0-D line, the guide roller 42 is guided to the inclined portion 51. , the guide roller 42 is guided to the lower left by the biasing force of the first and second springs 22, 32 (-the first pinion 6 is biased in the cassette mounting direction and placed in a locked state, and the engagement pin Bring -60 onto the OD line.

(See Figures 4 and 8) (g) The second pinion 6'
is fixed to the shaft 61 while meshing with the second rack plate 7' and rotates integrally with the first pinion 6, and is connected to the locking pin 60' disposed on the outside and the second board B2.
A return coil spring 62' stretched between the upper cut-and-raised piece b1 is wound around the outer periphery of the outwardly protruding cylindrical part 63' to store biasing force when the cassette is removed.

(See Figure 6) (Force) The first and second rack plates 7, 7
' has a symmetrical shape, and the inner surfaces of the fitting parts 70 and 70' that fit into the first and second guide posts 70 and 70' form a cylindrical notch 71 as shown in FIG. , a knot 73 is formed at a position corresponding to the outer retaining projections 72, 72'.

The fitting portions 70, 70' are slightly curved to support the cassette holder H upward by about 15 degrees when the cassette is removed, and to support it horizontally when the cassette is installed.

(See Figures 4 and 6) (IJ) Said first and second guide bosses l-8, 8'
are also symmetrical in shape, and include clamping guide ribs 80, 80, 80', 80' that sandwich the fitting portions 70, 70', and support pieces 82 for fitting and fixing the retaining plates T-81, 81'.
82 , 82 ′, 82 ′, and protruding ribs 83 , 83 ′ that circumferentially contact the cylindrical notches 71 , 71 ′ are arranged inside the clamping guide ribs to bear the shaft 61 and to support the base 84 . .84' onto the second substrate B2 on the plate b2. It is clamped and fixed at b2'.

Therefore, the protruding ribs 83° 83' and the cylindrical notch 71,
The closed space formed by 71' and node γ3゜73' is
An air damper is formed to provide a buffering effect at the beginning and end of cassette attachment/detachment.

(See FIGS. 4 and 6) The operation of the mechanism of this embodiment will be explained below.

(a) Before the cassette detachment state The two cassette holders H are in a raised state with the opening facing upward by about 15 degrees, and the biasing force exerted by the return coil spring 62' and the fourth spring 44 is as follows.
The retaining plate 81, 81' and the retaining protrusion 72, 7
It is regulated by the collision of 2'.

The engagement pin 60 is located on the OE line, positions the guide roller 42 slightly above the inclined portion 51 (position V in FIG. 8), and prevents the swinging roller 24 from entering the notch 15. It's in a tight state.

(b) Cassette mounting operation 2 When the cassette is inserted into the upwardly facing cassette holder H and the canopy is pressed, the rack plate 7' is lowered and the first pinion 6 and the second
The pinions 6' respectively rotate the engaging pin 60 and the locking pin 60' over half a circle.

Therefore, after the engagement pin 60 guides the guide roller 42 one step upward (up to position U in FIG. 8) against the bias of the fourth spring 44 by using the second swinging rod 4, , the fourth article 4
The first and second springs 2 are positioned on the inclined portion 51 with a biasing force of 4, and are stronger than the biasing force of the return coil spring 62'.
The urging force of 2.32 causes the cassette holder H to enter into the engagement notch 50 along the inclined part 51.
is further urged downward to enter the locked state (position W in Fig. 8).

On the other hand, the locking pin 60' on the second pinion 6' pushes the return coil spring 62' against the biasing force into the cylindrical portion 63.
′ to store the return force for detachment.

Therefore, the second swinging rod 4 is rotated around the second support shaft 40 by the urging force of the fourth spring 44 to support the engagement pin 60.
However, as the engagement pin 60 rotates,
In order to bring its action closer to the fulcrum and to reverse the biasing direction with respect to the rotational direction of the engagement pin 60, the fourth spring 44 is finally attached to the shaft 61 as indicated by a chain double-dashed line as shown in FIG. The return coil spring 62', which applies a moment P as shown in FIG.

Therefore, the sum of both moments is 0 as shown by the solid line. In other words, as shown by the solid line, the drag force exerted on the canopy of the cassette holder increases by -0.
It gradually decreases until it reaches .

However, after the guide roller 42 reaches the inclined portion 51, the repulsive force applied by the operator due to the biasing force of the first and second springs 22, 32 is reversely blown into the air without generating any drag force. , t-1H: 4 times.

(See the dotted line in FIG. 7) Therefore, the operator's feeling regarding loading the cassette is significantly improved.

(c) When the cassette is installed, the first guide roller 42 is engaged with the engagement notch 50 to be in a locked state.
The swinging rod 3 allows the retracted position detection means 2 to rotate counterclockwise, and the notch 15 of the loading disk 1
Then, the swinging roller 24 is removed, and the rotational restriction of the loading disk 1 is released.

(d) Cassette removal operation: By pressing the eject button (not shown), the eject lever 9 is slid to the left, and the bent portion 31 of the first swinging rod 3 is elastically moved by the third spring 33. tow the first swinging lever counterclockwise.

Therefore, the evacuation position detection means 2 is urged to rotate clockwise, and waits for the swing roller 24 to enter the notch 15 of the loading disc after reaching the unloading completion position, and the retraction of the first swing rod 3 is caused. Allowing the clockwise deflection, the guide roller 42 is released from the locked state, and the rack plates 7, 7' are raised by the bias of the return coil spring 62' to bring the cassette into the detached state. .

Note that if the eject button is pressed when the loading disc 1 has not reached the unloading completion position, the swinging roller 24 comes into contact with the outer periphery of the loading disc, so the guide roller 42 is not unlocked and remains locked. Therefore, no malfunction will occur.

According to the present invention as described above, not only does the cassette attaching operator feel good, but since the cassette is biased in the attaching direction when locked, the reel of the cassette can be reliably supported on the reel stand, and the effect is indisputable. be.

[Brief explanation of the drawing]

The figures illustrate one embodiment of the present invention, in which Figure 1 is a perspective view of the main part of the locking mechanism, Figure 2 is a sectional view of the same,
Figure 3 is a plan sectional view of the main parts showing the relationship between the pinion, rack plate and locking mechanism, Figure 4 is a right side view of the main part showing the relationship between the pinion and rack plate, and Figures 5 a, b and c are A-A in Figure 4
'+-B-B'C-C' sectional view, Figure 6 is a left side view of the main part showing the relationship between the pinion and rack plate, Figure 7 is a diagram showing changes in the moment exerted on the shaft, Figure 8 Figures showing the shape of the lock plate are shown respectively. Explanation of main drawing numbers: 6, 6'...1st and 2nd pinion, 62';...Returning coil spring, 44.
...Drag adjustment biasing means (fourth spring), 22,3
2...Locking biasing means (first and second springs).

Claims (1)

[Scope of utility model registration request] A pinion that rotates in conjunction with the attachment and detachment of the cassette holder,
A return coil spring increases the biasing force in the cassette detachment direction as the cassette holder is mounted, and a biasing force is applied in the cassette detachment direction together with the biasing force of the return coil spring at the start of cassette mounting in association with the rotation of the pinion. death,
A biasing means for adjusting drag that reverses the biasing direction during the mounting of the cassette in order to reduce the biasing force of the return coil spring that increases when the cassette is installed, and a biasing force in the direction of detaching the cassette holder just before the cassette is locked. 1. A cassette mounting mechanism comprising locking biasing means for biasing the cassette holder in the cassette mounting direction against the cassette holder and locking the cassette holder.