JP2678682B2 - Tape deck - Google Patents

Description

The present invention relates to a tape deck incorporated in a video tape recorder or the like for recording or reproducing by mounting a video cassette, an audio cassette, a digital recording cassette or the like.

"Prior Art" Conventionally, as disclosed in Japanese Utility Model Application Laid-Open No. 64-23734, there has been a technology of transmitting a driving force of a motor to a loading arm for moving a cassette holder forward and backward through a cam body and a gear body.

“Problems to be solved by the invention” In recent years, even in video tape recorders, miniaturization of home audio equipment such as mini component systems has urged the market to downsize them, and downsizing has become a big selling point. . In the conventional video tape recorder with additional functions such as HiFi, width 430mm height 95mm depth 340mm
Although the standard size was about 360 mm, width 360 mm height 9
A size of 2 mm and depth of 280 mm is required. Among these miniaturizations, miniaturization in the height direction is regulated by the size of the tape deck, and it has been considered that it is most difficult to lower the tape deck.

In the video tape recorder using the conventional technology, the swingable arm body is engaged with the cam groove of the disk cam rotated by the motor, and the gear body is driven by the operation of the arm body. The disc cam and the arm body were provided perpendicularly to the side surface of the chassis, which hindered miniaturization in the height direction. Further, since the swinging fulcrum of the arm body is provided between the engagement point with respect to the disc cam and the action point with respect to the gear body, the size of the arm body is increased in order to obtain the driving amount necessary for the forward / backward movement of the cassette holder. There was a problem of getting bigger.

"Means for Solving the Problems" However, the present invention provides a motor, a disk cam horizontally provided on the chassis surface, and a chassis surface that engages with a cam groove of the disk cam at its engagement point. An arm body that is installed horizontally,
A gear body provided on the side surface of the chassis that is connected at the point of action of the arm body and a cassette holder that is connected to the gear body and supports the cassette are used to rotate the disk cam by the forward and reverse rotation power of the motor. A tape deck for transmitting the rotational force of the disc cam from an engagement point to an arm body through a cam groove, and moving a cassette holder forward and backward by a gear body that rotates by receiving power of the arm body at an action point, A fulcrum is provided at one end of the arm body, and an action point is provided at the other end thereof, and an engagement point is provided at a position between the two points overlapping the cam member.

[Operation] Therefore, since the engagement point is provided between the fulcrum of the arm body and the action point, the drive amount required for the forward / backward movement of the cassette holder can be obtained with a small arm body, and the deck mechanism can be made compact. It is a thing.

"Example" Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a main part, FIG. 2 is a plan view of a VHS video tape recorder, FIG. 3 is a bottom view of the same, and FIG. 4 is a side view of the same. In the figure, (1) is a rectangular shape in plan view. Deck chassis,
(2) is a rotatable head cylinder for mounting a recording / playback head, and (3) and (4) are erected on slide bodies (7) and (8) that slide and guide via rails (5) and (6). VH
Attach the tape of the S video cassette (9) to the cylinder (2).
(10) and (11) are supply and take-up reel shafts that support the tape reel of the cassette (9), and (12) is a head that inputs and outputs audio signals. ) Is an erasing head, (14) is a capstan, and (15) is a pinch roller.

Further, in the figure, (16) is a cassette holder for supporting the cassette (9), and (17) and (18) are erected on the upper surface of the chassis (1) so that the cassette holder can be placed at the cassette (9) in / out position or the recording / reproducing position. Left and right guide plates for movably mounting (16). As shown in FIG. 4, open the door (22) from the cassette insertion opening (21) formed in the front plate (20) on the front of the cabinet (19). The cassette (9) is attached to the internal cassette holder (16).

Further, as shown in FIG. 2, a cam mechanism (23) is arranged on the upper surface of the chassis (1) on the right side of the cylinder (2),
A disk cam (24) and an arm body (25) are provided, and the fourth
As shown in the figure, the loading motor (27) is fixed to the upper side of the cam mechanism (23) via the bracket (26), and the pulley (28) is fixed.
The motor (27) is interlocked with the worm gear (31) via the (29) and the belt (30), and the worm wheel gear (32) formed on the outer peripheral surface of the disc cam (24) is always connected to the worm gear (31). The disc cam (24) is screwed to rotate the disc cam (24) forward and backward by the motor (27).

Further, the guide grooves (33) of the guide plates (17) (18)
Guide pin (34) (3) of cassette holder (16) to (33)
4) The cassette loading arm (35) (35) and the loading gear (36) (36), which are slidably inserted, are integrally formed with the shaft (37) outside the guide plates (17) (18).
The left and right loading gears (36) (36) are attached via the shaft (38) that is mounted via (37) and is supported by each guide plate (17) (18) and the fan-shaped gears (39) (39) at both ends. The loading arm (35) is engaged and connected to the guide pin (34), and the cassette holder (16) is slid back and forth and up and down by the swing of the arm (35). There is.

Further, as shown in FIG. 5, it is provided with first and second rack gears (40) (41) for loading the cassette (9), and the upper and lower guide rails (42) are provided outside the right guide plate (18).
Each rack gear (40) (41) is slidably mounted in the front-rear direction via (43), and each rack gear (40) (41) is slid in the sliding direction via the long hole (44) and pin (45). The rack gears (40) and (41) are contractably supported by a spring (46), and a linking roller (47) provided at one end of the arm body (25) is attached to the rear end of the first rack gear (40). The notch (48) facing downward, the arm member (25) is swung by the rotation of the disk cam (24), and the first and second rack gears (40) (41) are slid back and forth to load the loading arm. (35) is configured to swing.

Further, as shown in FIG. 6, the cassette (9) inserted into the cassette insertion opening (21) pushes the cassette holder (16) to swing the loading arm (35), and the spring (46).
When the second rack gear (41) is advanced against the load, the switch (49) on the side surface of the guide plate (18) is turned on by the loading arm (35), and the motor (27) is operated via the switch (49). When the cassette (9) is returned to the cassette insertion opening (21) by the backward drive of the rack gears (40) and (41) as shown in FIG. 4, the cassette loading operation is started. ) The side switch (50) is turned off by the protrusion (51) of the second rack gear (41), the motor (27) is stopped via the switch (50), and the cassette eject operation is terminated. ing.

Further, as shown in FIG. 3, a tape loading lever (53) that swings around the shaft (52) by the rotation of the disc cam (24) is provided on the rear surface of the chassis (1), and the slide bodies (7) are ) (8) Tape loading arm (55) (56) to connect with (8) via link (54) (54)
Is swingably attached to the shaft (57) (57) on the rear surface of the chassis (1), and each arm (55) (56) is attached via the gears (58) (58).
And the pinion gear (59) on one arm (56)
And the lever (53) is connected via a rack gear (60), and each arm (55) is rocked by swinging the lever (53).
The tape of the cassette (9) supported by the reel shafts (10) and (11) is for reciprocally swinging the tape loading pins (3) and (4) by guiding the rails (5) and (6) through the (56). Is pulled out by the forward movement of each pin (3) (4) and wound around the cylinder (2), while the tape is returned to the cassette (9) by the backward movement of each pin (3) (4). There is.

Further, as shown in FIG. 1, a cam shaft (61) is erected on the chassis (1), a disc cam (24) is rotatably supported on the shaft (61), and the chassis (1) is ), A supporting shaft (62) is erected, one end of the arm body (25) is rotatably supported by the shaft (62), and the arm body (25) is traversed on the upper surface side of the disc cam (24). The cam shaft (61) is loosely fitted and inserted into the long hole (63) of the arm body (25), and the bracket (26) is fixed to the upper end of each shaft (61) (62).

Further, a cassette loading cam groove (64) is formed on the upper surface of the disc cam (24), and an engaging pin (65) is projectingly provided on the lower surface side of the arm body (25) so that the cam groove (64 A cassette holder (16) for supporting the cassette (9), in which the engagement pin (65) is slidably fitted in the (64).
And a motor (27) for moving the cassette holder (16) forward and backward, a cam mechanism (23) for transmitting the driving force of the motor (27) to the cassette holder (16) at a non-constant speed. Together with the motor (27)
Cam groove (64) formed in the disk cam (24) rotated by the arm member (25) engaged with the cam groove (64)
And constitute a cam mechanism (23).

Further, the cassette loading end portion (64a) of the cam groove (64) is formed to have a gradual inclination change as compared with the start portion (64b), so that the movement speed when the cassette holder (16) at the cassette loading / unloading position enters is increased. Fasten and cassette holder (16)
To slow down the moving speed when approaching the recording / reproducing position, and to change the swing speed of the arm body (25) to move the cassette holder (16) at a non-constant speed. The cam groove (64) is formed in such a shape that the operation speed of the arm body (25) at that time becomes slower than that at the start of mounting, and the roller (point of action of the arm body (25) to be connected to the cassette holder (16) ( 47) is the engagement pin (6) which is the engagement point of the arm body (25) to be engaged with the cam groove (64).
The roller (47) and the engagement pin are attached to the support shaft (62) of the arm body (25) so as to be farther from the support shaft (62) which is the fulcrum of the arm body (25) than that of 5). (65) is arranged.

This embodiment is constructed as described above, and the cassette (9) is inserted into the cassette holder (16) from the cassette insertion opening (21) as shown in FIG. 4, and the cassette (9) is pushed in as shown in FIG. By swinging the loading arm (35) with, the motor (27) is actuated via the switch (49), and the disc cam (24) in FIG. 1 is rotated clockwise to move the cam groove (64). The arm body (25) is rotated in the clockwise direction via the to move the rack gears (40) and (41) forward to move the cassette holder (16) to the recording and reproducing position. Direction, the tape loading lever (53) is swung, and the loading pins (3) and (4) are slid by the guides of the rails (5) and (6) to support the reel shafts (10) and (11). The tape of the cassette (9) that is Is intended to wound on the cylinder (2) is pulled out.

By the reverse rotation control of the motor (27), the disc cam (24) reversely rotates, the tape is stored in the cassette (9), and then the rack gears (40) and (41) are moved backward to move the cassette holder (16). The cassette (9) is returned to the cassette loading / unloading position and returned to the cassette insertion opening (21).

"Effects of the Invention" As is apparent from the above-described embodiments, the present invention is directed to the motor (2
7), a disc cam (24) provided horizontally on the surface of the chassis (1), and a chassis (1) that engages with a cam groove (64) of the disc cam (24) at its engagement point (65). ) Surface horizontally provided with an arm (25) and an action point (47) of the arm (25)
Gear body (3
6) and a cassette holder (16) connected to the gear body (36) and supporting the cassette (9), the motor (2
The disc cam (24) is rotated by the forward and reverse rotational power of 7), and the rotational force of the disc cam (24) is transferred from the engagement point (65) to the arm body (25) via the cam structure (64). A tape deck in which the cassette holder (16) is moved forward and backward by a gear body (36) that transmits and receives the power of the arm body (25) at an action point (47), and one end of the arm body (25). Is provided with a fulcrum (62) and an action point (47) at the other end, and an engagement point (65) is provided between the two points at a position overlapping the cam member (24). The fulcrum of the arm body (25) ( Since the engagement point (65) is provided between the operation point (47) and the operation point (47), the driving amount required for the forward / backward movement of the cassette holder (16) is small.
It can be obtained in 5) and the deck mechanism can be made compact.

[Brief description of the drawings]

FIG. 1 is a plan view of an essential part showing an embodiment of the present invention, FIG. 2 is a plan view of a VHS video tape recorder, FIG. 3 is a bottom view thereof, FIG. 4 is a side view thereof, and FIG. FIG. 6 is a partial plan view, FIG. 6 is a cassette insertion explanatory view, and FIG. 7 is an operation explanatory view of FIG. (9) …… Cassette (16) …… Cassette holder (23) …… Cam mechanism (24) …… Disc cam (25) …… Arm body (27) …… Motor (36) …… Loading gear (gear Body) (47) …… Coupling roller (point of action) (62) …… Spindle (fulcrum) (64) …… Cam groove (65) …… Engagement pin (engagement point)

Claims (1)

(57) [Claims] 1. A motor (27), a disk cam (24) provided horizontally on the surface of the chassis (1), and an engagement point (65) in a cam groove (64) of the disk cam (24). The arm body (25) provided horizontally on the surface of the chassis (1) engaged with the gear body (36) provided on the side surface of the chassis (1) connected at the action point (47) of the arm body (25). ) And a cassette holder (16) connected to the gear body (36) and supporting the cassette (9), the disc cam (24) is rotated by the forward and reverse rotational power of the motor (27), The rotating force of the disc cam (24) is passed through the cam groove (64) from the engagement point (65) to the arm body (25).
To the cassette holder (16) by the gear body (36) that is transmitted to the arm body (25) and receives the power of the arm body (25) at the action point (47).
And a fulcrum (62) at one end of the arm body (25) and an action point (47) at the other end of the arm body (25) at a position overlapping the cam member (24). A tape deck that features a score (65).