JPH0313892Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a front loading mechanism used in a video or audio tape playback device, a projector for microfilm formed into a cassette film, and the like.

In a video or audio tape playback device, the cassette tape is loaded into a predetermined position inside the device by inserting the cassette tape into the cassette tape insertion slot on the front panel and loading the tape automatically using electric power. This is what I did.

This type of loading mechanism requires precision and robustness for easy handling, so it generally has a large, complicated structure and is expensive.

The present invention was devised in view of the above circumstances, and the purpose of the present invention is to provide a front loading mechanism that is simple in structure and can be produced at low cost. A plurality of guide grooves having vertical portions and a cassette pressing guide groove parallel to the vertical portions of the guide grooves are formed, the cassette carrier is cantilever-supported so as to be movable along the guide grooves, and a cassette pressing guide groove is formed. While supporting the cassette presser movably along The first and second links are connected by a third link so as to form the apex of a parallelogram together with the pivot point of the drive shaft and the second link, and a part of this third link is connected to the support point of the cassette carrier. At the same time, a fourth link is connected between one point in the middle and the supporting point of the cassette pressurer, and the fourth link is further spanned between the main frame and the cassette carrier to connect two of the guide grooves. A tensile force having a component force in the direction is applied to the cassette carrier by a spring, and the first link is rotated clockwise or counterclockwise at a constant rotation angle by a drive unit such as a motor. When the third link is moved in the horizontal direction, the cassette carrier is caused to move in the front and back directions, and the third link is moved in the vertical direction to move the cassette carrier in the up and down directions.

Hereinafter, the present invention will be explained in detail based on examples.

Figures 1 to 9 a, b, and c show an embodiment of the present invention, which is a projector that projects a microfilm formed into a cassette film. Main frames 1, 2A to 2D are this main frame 11
It is an L-shaped guide groove with a horizontal part and a vertical part. Reference numeral 3 denotes a cassette pressing guide groove formed in the main frame 1, which is parallel to the vertical portions of the guide grooves 2A to 2D. Reference numeral 4 designates a cassette carrier cantilevered by guide rivets 5A to 5D and a cassette carrier stay 6 so as to be movable along the guide grooves 2A to 2D of the main frame 1; 7 is a first link; It is fixed to the drive shaft 8. Reference numeral 9 denotes a second link, one end of which is pivotally supported at a predetermined point on the main frame 1. Reference numeral 10 denotes a third link, which is formed into a substantially crank shape and is connected to the first and second links 7,
It is set between 9. In that case, the first and second links 7 and 9 are parallel to each other, and their connection point, together with the drive shaft 8 and the pivot point, is the apex of the parallelogram. This third link 10 has slits (elongated holes) at the connection part with the second link 9, the middle horizontal part, and the lower right part (the connection part with the cassette carrier).
is provided to allow escape or to serve as a guide for the link's anti-shake portion. That is, the slit in the intermediate horizontal portion intersects the guide groove 12 of the support plate 11, and a guide rivet 13 is inserted through the intersection to prevent wobbling. Further, the lower right portion is engaged with the guide rivet 5D, and at this point it is connected to the cassette carrier 4 via the stay 6.

14 is a fourth link, which is connected to the third link 10.
The guide rivet 15A inserted into the cassette pressing guide groove 3 is connected to the guide rivet 15A. This link 14 forms a slit (elongated hole) in its longitudinal direction, and the third link 1
This is used as an escape route at the connection with 0. The guide rivet 15A is attached to the pressure stay 16 together with another guide rivet 15B, and transmits the vertical displacement of the third link 10 to the cassette pressure 17 fixed to the stay 16.

That is, as shown in FIG. 5, the pressure stay 16 is inserted into the cassette pressing guide groove of the main frame 1.
is supported by guide rivets 15A and 15B so as to be movable up and down, a spring 18 is installed between the main frame 1 and the pressure stay 16, and the cassette pressure 17 is attached to this stay 16, while the fourth link 14 is attached to the guide rivet 15A.
are connected.

19 is a motor, 20 is a reducer, 21 is a worm fixed to the shaft of this reducer 20, 22 is a worm wheel that meshes with this worm 21, and this wheel 22 is fixed to the drive shaft 8.
That is, this motor 19 etc. becomes a driving part of the link mechanism.

Reference numeral 23 denotes a fifth link, which rotates in contact with the cam 24 fixed to the drive shaft 8, and rotates to rotate the lens stay 2.
5 is moved upward to position the lens 26 on the optical path.

27 is main frame 1 and cassette carrier 4
A spring 28 is applied to the cassette carrier 4 to apply a tensile force (arrow a in FIG. A limit switch 29 operates when the cassette A moves to a predetermined position, that is, when loading is completed, a limit switch 29 operates when the cassette A is placed in the normal position of the cassette carrier, and a limit switch 30 detects the completion of ejecting.

Next, the operation will be described. When cassette A is inserted through the rectangular enclosure (cassette insertion slot) with diagonal lines inside shown in Fig.
When the cassette carrier 4 reaches its normal position as shown in FIG. 8a (see FIG. 6), the limit switch 29 is activated. When the switch 29 is turned on, the motor 19 rotates, and its rotational force is transmitted to the drive shaft 8 with deceleration and direction change. As a result, the first link rotates clockwise in the drawing, and the second link 9 and third link 10 also move accordingly. The third link 10 moves in a circular arc and in parallel. Among the displacements of the third link 10, the horizontal displacement is transmitted to the stay 6 and the cassette carrier 4 via the guide rivet 5D, and the cassette carrier 4 moves inward. At this time, the displacement of the fourth link 14 in the vertical direction is absorbed by the movement (relief) of the connection point with the third link 10, so the fourth link 14 only rotates and does not move in the vertical direction.

The rotation angle of the first link (Fig. 8b)
When this happens, the cassette carrier 4 reaches near its horizontal limit point, and the first link 7
In the rotation of , the fourth link 14 is connected to the third link 1
As 0 moves downward, it will be pulled down. As a result, the cassette pressure 17 is pulled down via the pressure stay 16, thereby pushing down the cassette A and the cassette carrier 4 to reach a predetermined position as shown in FIG. 8c. During this pushing down process, the cam 24 comes into contact with the fifth link 23, and the link 23 rotates, causing the lens 26 to
is now located on the optical path. When the limit switch 28 is operated by pressing down, the motor 19
stops. In other words, loading is completed.

On the other hand, when the motor 19 is reversely rotated during ejection, the cassette carrier 4 is
is raised to Figure 8b. After that, when the cassette moves in the horizontal direction (back and forth direction) and moves away from the carrier 4 due to the operation of an eject mechanism (not shown) and a part of it comes out of the insertion slot, the limit switch 30
operates, the operation of the motor 19 is stopped, and ejection is completed.

The movement of the link mechanism during loading is schematically shown in FIGS. 9a, b, and c, which correspond to FIGS. 8a, b, and c.

As described above, according to the present invention, a plurality of guide grooves are provided in the main frame on one side of the cassette mounting part, the cassette carrier is cantilever-supported so as to be movable along the guide grooves, and the cassette carrier is supported horizontally (back and forth) by the link mechanism. ),
In addition to moving the cassette in the vertical (up and down) direction, a spring applies a tensile force to the cassette carrier, making it possible to load the cassette accurately and smoothly with a relatively simple structure. Since they are concentrated around the frame, they can be made compact and manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the front loading mechanism according to the present invention, FIG. 2 is a plan view of the same,
Figure 3 is the same left side view, Figure 4 is the right side view, and Figure 5 is the same left side view.
The figure is an exploded perspective view of the cassette presser part, Figure 6 is a perspective view showing the state in which the cassette is placed on the cassette carrier, Figure 7 is a perspective view showing the shape of the guide rivet, and Figure 8 a, b, c. and Figure 9 a, b,
c is a side view and a link operation explanatory diagram for explaining the operation. 1... Main frame, 2A to 2D... Guide groove, 3... Cassette pressing guide groove, 4... Cassette carrier, 5A to 5D... Guide rivet,
7...First link, 8...Drive shaft, 9...Second
link, 10...3rd link, 14...4th link
Links, 15A, 15B...Guide rivets,
17... Cassette pressure, 18, 27... Spring, 19... Motor.

Claims (1)

[Claims for Utility Model Registration] A plurality of guide grooves 2A, 2 are formed in the main frame 1 on one side of the cassette mounting part so as to have a horizontal part and a vertical part whose upper limit is the limit point on the back side of the horizontal part.
B, 2C, 2D, a cassette pressing guide groove 3 formed vertically at a predetermined position of the main frame 1, a cassette presser 17 supported so as to be vertically movable along the guide groove 3, and the guide. A cassette carrier 4 is cantilever-supported so as to be movable along the grooves 2A, 2B, 2C, and 2D, and the first link 7 has one end fixed to the drive shaft 8. A second link 9 is provided so that the fixed point serves as a pivot point,
Further, a third link 10 is provided so that the connection point with the first and second links 7 and 9 is a vertex of a parallelogram together with the pivot point of the drive shaft 8 and the second link 9,
A portion thereof is engaged with one of the support points of the cassette carrier 4, and this third link 10
A link mechanism in which a fourth link 14 connects a point in the middle of the cassette presser 17 to a support point of the cassette presser 17, and a first link 7 of this link mechanism is rotated clockwise or counterclockwise at a constant rotation angle. A drive unit that rotates in a clockwise direction, and a driving unit that is stretched between the main frame 1 and the cassette carrier 4 and pulls the cassette carrier 4 by the component forces in two directions of the guide grooves 2A, 2B, 2C, and 2D. A front loading mechanism comprising a spring 27.