JPS6050739A - Cassette loading device - Google Patents

Abstract

PURPOSE:To save the space and at the same time to eliminate the need for wiring on a switch in order to simplify the structure of a cassette loading device, by collecting tact switching type switches which control the loading/unloading action of a VTR cassette at an area by making good use of an idle space on the wall at the chassis side. CONSTITUTION:An up-end switch SW1, an insertion switch SW2 and a down-end switch SW3 are provided on the surface opposite to a driving gear 38 of a printed base board 40 attached at the lower side of guide groove 24 of a side plate 13. When a cassette A is loaded together with a cassette holder 20, the switch SW2 is turned on by a projection 42B of the gear 38. Then a motor 26 works to start a loading action for cassette. When the holder 20 moves along the group 24 and the cassette A is loaded to a reel drive disk, the switch SW3 is actuated by a projection 42C. Then the drive of the motor 26 is stopped to complete the cassette loading action. When the motor 26 is reversed by an ejection button, the holder 20 is taken out up to an opening part. Then the switch SW1 is actuated by a projection 42A. Then the drive of the motor 26 is stopped to complete the cassette ejecting action.

Description

TECHNICAL FIELD The present invention relates to an improvement in a cassette loading device for a video tape recorder (hereinafter referred to as VTR).

BACKGROUND ART Some VTRs are of a type in which a cassette is loaded onto a reel stand and then ejected by a front loading method. With this front loading method,
The cassette is inserted into a cassette holder at the back of the cabinet through an opening on the front surface of the cabinet, and is fed along a predetermined path onto a reel stand located below the cabinet to an appropriate size, and then taken out from there. This cassette loading mechanism includes a cassette in switch that detects that the cassette is correctly inserted into the cassette holder, a cassette down switch that detects that the cassette is loaded onto the reel stand, and a cassette down switch that detects that the cassette is loaded onto the reel stand. A cassette set-up switch is provided for detecting whether the cassette is removed at the same time as the cassette. Turning each switch on or off causes the rotating motor to rotate forward, reverse, or stop, thereby loading and unloading the cassette. Conventionally, leaf switches or skeleton type switches have been used as such switches.

However, due to space constraints or structural constraints, these switches must be exposed and protrude outward from the m111 wall of shear 7, and therefore, during assembly or repair, they must be placed in the same position as other components. In addition, each switch must be wired and pulled out separately, which requires installation space, has a complicated wiring structure, and has the disadvantage of making wiring work troublesome. Furthermore, these switches lacked reliability due to variations in characteristics such as on/off timing. To do this, we had to make detailed timing adjustments separately, which was a hassle and a hassle.

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and it is possible to effectively utilize the empty space on the side wall of the chassis to centrally install the switches in one place, thereby saving space. Eliminates the need for switch wiring and simplifies the structure by % I
~ and aims to improve the reliability of the switch.

This objective can be achieved by the following configuration.

That is, in the present invention, a switch for controlling loading and unloading operations of cassettes is provided on a printed circuit board attached to the side wall of the seven palms, and the cassette holder and driving gear passing over the substrate mounted on the side wall are connected to the substrate. The device is characterized in that a lip-shaped protrusion corresponding to the switch is provided on the opposing surface, and the switch is turned off and turned off by pressure from the rib-shaped protrusion.

The components 1 to 2 are concentrated on the main board and can be mounted together with this board on the side wall of the chassis.

Furthermore, since the switch can be directly mounted by embedding it on the printed circuit board, no wiring is required for the switch, and the switch structure can be made simple and compact. Therefore, space can be used effectively and space can be saved.

In addition, since the switch is covered by the cassette holder drive gear and has almost no exposed or protruding parts, it is possible to reliably prevent damage during assembly or inspection and repair, which was previously the case. Furthermore, there is no need to use a +7- switch or a skeleton type switch, and variations in switch characteristics and poor handling can be prevented. Therefore, the reliability of the switch can be improved. Moreover, the on/off timing can be set accurately, eliminating the need for troublesome timing adjustments. do.

FIG. 1 is a perspective view of an external oblique device of a VTR to which this sentinel is applied.

5- In these figures, a rectangular opening 11 having a size and shape that allows insertion of the cassette A is formed on the front surface of the cabinet 10, and the cassette A is inserted through this opening 11. ing.

A pair of side plates 12 forming a chassis are provided at the back of the opening 11
, 13 are provided extending in the depth direction and facing each other at substantially equal intervals to the lateral interval of the opening 11. 9111
A top plate 14 is attached to the top of the plates 12 and 13. The upper end surface side of a light-transmissive lid 15 is pivotally attached to the upper front end of the side plates 12 and 13 inside the opening 11 so as to be rotatable in the cassette insertion direction.

A box-shaped cassette holder 20 that opens in the front and back is supported at the upper part between the side plates 12 and 13 behind the opening it.

The side plate 12 has three L-shaped guide grooves 21°, 22.
23 horizontally backward from the front (side of the opening 11),
Then, it is formed to face vertically downward. The guide groove 21 is located at the rearmost upper part of the side plate 12, the guide groove 22 is located in the middle thereof, and the guide groove 23 is located at the front lower part thereof.

The horizontal portions 211, 221 of the guide groove 21.22 are provided so as to be located approximately on a straight line, and this portion 211.22
1 to guide the cassette holder 20 in the horizontal direction. In addition, the vertical portion 222 of the guide groove 22° 23
．． 231 is provided so as to be positioned substantially on a straight line, and these portions 222 and 231 guide the cassette holder 20 vertically downward. These guide grooves 21, 2
Shaft portions 201, 202, and 203 protruding from one side wall of the cassette holder 20 are slidably fitted and supported at 2 and 23, respectively.

On the other hand, the side plate 13 is provided with a pair of L-shaped guide grooves 24 that correspond to the guide grooves 22 of the side plate 12 and are parallel to each other. The cassette holder 20 is inserted into this guide groove 24.
A shaft portion 204 protruding from the other side is slidably fitted and supported.

A mounting base 25 is installed at the rear upper part of the outer wall of the side plate 13, and a cassette loading motor 26 is mounted on this mounting base 25. A pulley 27 is attached to the shaft of this motor 26. On the other hand, a transmission shaft 29 is horizontally supported along the side plate 13 between the mounting base 25 and a support base 28 installed near the front end of the side plate 13 . A belt 31 is passed between the pulley 30 attached to the transmission 11129 and the second pulley 27. A worm gear 32 is integrally provided at the front end of the transmission +11129. A worm wheel 34 provided at one end of a connection ++11133 installed between the lower front ends of the side plates 12 and 1.3 meshes with this worm gear 32.

A gear 35 is attached to one end of the connecting shaft 33 coaxially with the worm wheel 34 and releasably connected to the worm wheel 34 via friction transmission means. That is, the worm wheel 34 is loosely fitted onto the connecting shaft 33, and a friction member 36 made of felt, leather, etc. is fixed to one surface of the gear 35, which faces one surface of the worm wheel 34. A spring holder 37 is provided at the end of the connecting shaft 33, and the worm wheel 34 is inserted between the spring holder 37 and the worm wheel 34.
A spring (not shown) is interposed which presses against the gear 35 via a spring 6.

The gear 35 meshes with a cassette holder drive gear 38 which is supported on the side plate 13 behind it and is shaped like an obtuse sector.

A printed circuit board 40 is mounted below the guide groove 24 near the front of the side plate 13, making use of the empty space. On the component mounting surface of the printed circuit board 4D facing the drive gear 38, an end switch SW shown in FIG. They are arranged at regular intervals either on the outer side lower side or on the inner side upper side. These switch SWs
, SW2.

SW3 is composed of a tact switch. Therefore, since it is small and can be mounted directly by embedding it in the board 40, wiring to each switch is unnecessary, and a narrow space can be used effectively without requiring space, allowing for concentrated and compact mounting. I can do it.

9- On the other hand, a groove 41 extending inward is provided on the back surface of the drive gear 38 facing the side plate 13. Concentric circles Q', R' corresponding to the concentric circles Q, R, S on the inner surface of this groove 41
, 1 on S' SW+ , SW2.

Rib-like protrusions 42A, 42B that turn on and off SW3, respectively;
42C are provided along the circumferential direction in this order from the outside in the radial direction to the inside. Lip-like projection 42A.

The switch suppression starting ends of 42B and 42C are respectively sloped surfaces having a predetermined angle, so that the switch is pushed diagonally when the switch is first pressed. Therefore, the switch can be turned on and off smoothly and with good timing depending on the inclination angle. This inclination angle is set to, for example, 30°, but it is also possible to have an R shape instead.According to this, each switch SW1. SWt, SW
s is covered by the drive gear 38, there are almost no exposed and protruding parts, and damage during repair and inspection can be prevented.

One end of a cassette holder drive arm 43 (7) is pivotally attached to the outwardly projecting end of the guide groove 24 of the shaft portion 204. An elongated hole 431 is provided at the other end of the arm 43, and the elongated hole 431 protrudes from the side of the notch edge of the drive wheel 38. There is..

A coil spring 45 is interposed between one end of the arm 43 and a mounting piece 381 provided at the edge of the notch of the drive gear 38, and the coil spring 45 is inserted into the cassette holder via the shaft portion 2()4 in the ejected state of the cassette A. 20 in the insertion direction.

On the other hand, a gear 46 is attached to the end of the connecting shaft 33 projecting outward from the side plate 12. The gear 46 meshes with a substantially obtuse sector-shaped cassette holder drive gear 47 supported on the side plate 12 behind it. 3. A cam 48 is coaxially provided on the back surface of the drive gear 47 facing the side plate 12. A cam roller 50 provided on the lever assembly 49 is in sliding contact with this cam 48. The lever unit 49 is formed in an oval shape, and its bent base end is pivotally attached to the lower front end of the side plate 12. One end of the integrated lever 49 extends to one side of the lid 15, and a shaft 51 provided at one end of the lever unit 49 extends to a stepped portion 15 provided at one edge of the lid 15.]
is in contact with the front of the The integrated lever 49 opens and closes by force in conjunction with the insertion and ejection operations of the cassette A.

The protrusion 11'l outward from the guide groove 22 of the shaft portion 202
*One end of the cassette holder drive arm 52 is pivotally attached to the IW section. An elongated hole 521 is provided at the other end of the arm 52, and the elongated hole 521 protrudes from the side of the edge of the notch of the drive gear 47 and is slidably inserted into the shaft portion 53. A coil spring 54 is interposed between one end of the arm 52 and a mounting piece 471 provided at the edge of the notch of the drive gear 47, and the coil spring 54 is inserted into the cassette holder 20 in the insertion direction when the cassette A is ejected via the IQb part 202. The number of participants is increasing.

The left and right driving centers 38, 47 rotate in the same direction in synchronization with each other, and are arranged to reciprocate the cassette holder 20 along the two guide grooves via the arms 43, 52.

Next, a cassette loading operation according to this embodiment with the above configuration will be described.

First, when the cassette A is inserted through the opening 11 of the cabinet 10, the cassette A is inserted into the cassette holder 20 on the back while pushing the lid 15 open. Push it into. At this time, the worm wheel 34 is held in a stopped state by meshing with the worm gear 32. On the other hand, the gear 35 is rotatable in the cassette pushing direction by sliding between the member 36 and one surface of the worm wheel 34. Further, the gear 46 is rotatable in the same direction as the gear 35 via the connecting shaft 33. Furthermore, spring 45.5
4 is extended by a certain length due to the movement of the shaft portions 204 and 202 toward the front of the chassis as the cassette is ejected [7, and the spring force thereof applies a biasing force to the sumo wrestler holder 20 in the cassette insertion direction.

When the cassette A is pushed in together with the cassette holder 20, one end of the arm 43 (52) 13- is biased by the shaft portion 204 (202) of the cassette holder 20 and is pushed into the guide groove 24 (22), as shown in FIG. along the same pushing direction as shown by arrow 100.

Then, the spring 45 (54) tilts from the extended state.

At this time, since the force of the chair 1 is applied to the cassette holder 20 in the cassette insertion direction as described above by the spring force of the spring 45 (54), the force required for pushing the cassette holder 20 is reduced. Shitakatsu-C1 Cassette) A can be inserted smoothly and easily.

In FIG. 5, the left and right drive gears 38, 47, arms 43, 52, springs 45, 54, etc. perform the same operation in synchronization with each other, so only one of them is shown and the other is completely omitted. When 43 and 52 move, the drive gear 38°47
The cassette is biased through the engagement of the elongated shaft 431, 521 at the other end with the shaft portion 44° 53 as shown by arrow 101. When A is pushed into a predetermined position inside the chassis together with the cassette holder 20, the rotation of the drive gear 3814 causes the lip-shaped protrusion 42B to push the cassette/insert switch SW2 to the appropriate position and turn it on. When the loading motor 26 is activated, the worm wheel 34id is rotationally driven via the worm gear 32. This rotational force is transmitted to the gear 46 via the coupling FIII 33 between the gears 35f'in and 'j by the frictional force caused by the pressure contact between the member 36 and the surface of the worm wheel 34, and rotates the gear 46. As a result, the drive gear 38 and 47 are rotated and the loading operation starts. Then, the arms 43 and 52 move accordingly, and the shaft portion 204 .
202 and urges the cassette holder 20 in the same direction at one end thereof.

As a result, the cassette holder 20 first moves into the guide groove 21 as shown in FIG. .

After that, the cassette holder 20 is moved to the guide groove 21°22.2.
3, and as shown in FIG.
When the reel is fed to the reel 0, the reel A is loaded onto the reel stand 60. At the same time, as shown in FIG. 9, the cassette down-end switch SW3 is pushed in by the -C'J protrusion 42C by the rotation of the drive gear 38 and turned on, and the motor 26 is stopped. (Kasetsu)
Loading of A is completed.

On the other hand, when ejecting the cassette A, by operating the eject button (not shown) and moving the motor 26 in reverse and fE, the cassette holder 20 moves in the opposite direction to that described above.
3 is taken out to the back of the opening 11, and at its end, as shown in FIG. When the cassette A is loaded onto the reel stand 60, even if an excessive force is applied to the cassette holder 20 etc. by the driving force of the motor 26, the ejection of the sumo wrestler throat A is completed. The force is sufficiently absorbed by the sliding between the wheel 34 and the member 36 (1, and each switch SWt, SWz, SW
5 to the printed circuit board 40 and corresponding lip-shaped protrusions 42A, 42B.

The position where 42C is provided can be changed as necessary.

Furthermore, in the above embodiment, three guide grooves are provided on one side plate 12.
Although the description has been given of one provided on the other side plate 13, the number is not limited to this, and can be increased or decreased as needed. Furthermore, the types and number of switches mounted on the printed circuit board 40 are not limited to those shown in the embodiments, and of course can be increased or decreased and modified as appropriate.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the overall appearance of a VTR to which the present invention is applied, Fig. 2 is a perspective view of a cassette loading device according to the present invention, Fig. 3 is a perspective view thereof, and Fig. 4 is a perspective view thereof. FIG. 5 is a side view illustrating the cassette loading operation according to the main part; FIG. 6 is a perspective view of the main part illustrating the operation; FIG. 8 is a side view illustrating the operation, FIG. 9 is a perspective view 17-- of the main part, and FIG. 1() is a perspective view illustrating the cassette loading operation according to the present invention. 12, 1.3...Side plate (side wall), 40...
... Printed circuit board, A... Cassette, SW2... Cassette in-nat switch (cassette in switch), S~V,... Cassette setup end switch (
Cassette setup switch), SW3... Cassette down end switch (
Cassette down switch), 20... Cassette holder, 38... Drive gear (drive gear), 42A, 4
2B, 42C... Lip-like projections. Patent applicant: NEC Home Electronics Co., Ltd. 18- Procedures: Sode Ichiten (2) No further notes 20 Name of the invention Cassette loading device 3 Relationship with the amended person case Patent applicant address: Ume, Kita-ku, Osaka City 111-chome 8-17-4, Agent: 160 Address: 4th floor, Ueda Building, 18 Sanei-cho, Shinjuku-ku, Tokyo Saeki Patent Office

Claims (1)

[Claims] (1) A cassette holder is supported in a guide groove provided on the side wall of the chassis so that it can move forward or backward along a predetermined path, and a cassette inserted into the cassette holder is reeled along the path. In a cassette loading device that feeds and takes out a cassette onto a table, a switch such as a tact switch for controlling loading and unloading operations of the cassette is provided on a printed circuit board attached to the side wall of the chassis,
A rib-shaped protrusion corresponding to the switch is provided on a surface of a cassette holder driving gear that passes over the substrate provided on the side wall and faces the substrate, and the switch is turned on and off by the rib-shaped protrusion. A cassette loading device consisting of: