JPS61265768A - Cassette loading and ejecting device - Google Patents

Abstract

PURPOSE:To decrease variation in an operating time and also to reduce the operating time by using a DD capstan motor as a power source and using gears a torque delivery means from a motor. CONSTITUTION:The DD capstan motor 1 is used as the cassette loading torque and a torque is delivered from the motor, then a stopper offering an accurate pitch interval is provided and gears are meshed with together. Further, speed control is applied to the motor 1 to decrease the load current of the motor 1 and the motor is driven at a constant speed against the load fluctuation within a control range. Thus, the service life of the motor and bearings is extended remarkably, the operating time is reduced and the operation is finished in a stable time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cassette loading device for use in video tape recorders and the like.

2. Description of the Related Art A conventional cassette loading device will be explained with reference to FIGS. 3 and 4.

Figure 3 is a diagram showing how the power from the motor is transmitted to the front loading unit in Figure 4.
It is a sketch of the mechanical chassis unit seen from the back. 22
is a DC capstan motor that rotates in both counterclockwise directions. A capstan belt 23 transmits the 220 rotations of the DC capstan motor to the flywheel 24. The thrust receiver 26 is a plate, and is fixed to a fixed part. Reference numeral 26 denotes an idler lever, which rotates around a single shaft 27. 28 is the idler lever 26
The idler tire is rotatably provided on the top, and the tire part that corresponds to the flywheel 24 and the eject belt 29
There are two stages of V-grooves. 30 is Ijiektono (ne), idler rail 26 and thrust receiver are plate 25
The idler tire 28 is pressed onto the flywheel 24. The friction force generated at this time allows the idler tire 28 to transmit the rotation of the flywheel 24, and power is transmitted to the front loading pulley 31 via the eject belt 29. In addition, 26a is an eject pin, which is attached to the idler lever 2eK and has a cam-shaped hole 32 drilled in the main rod 32.
It is inserted in a.

33 is a loading motor which is selectively rotated counterclockwise. A loading motor pulley 34 is press-fitted into the loading motor 33, and a first loading belt 36 transmits the rotation of the motor to an intermediate pulley 36. The rotation of the intermediate pulley 36 is transmitted to the large pulley 38 by a second loading belt 37. The large pulley 38 has a two-stage configuration including a V pulley portion 38a and a gear ssb, and the gear portion 3sb meshes with the cam gear 39. The cam gear 39 has a cam groove 39a, into which a cam gear pin 32b fixed to the main rod 32 is inserted. A slide lever 40a (movable) provided on the mode switch 40 (fixed) is inserted into a part of the main rod 32, and detects the horizontal movement position of the main rod 32.

Next, FIG. 4 is a right side view of the front loading unit, and the power transmitted to the front loading pulley 31 is transmitted to this unit.

41 is a worm shaft into which the front loading pulley 31 and the worm 42 are press-fitted.

43 is a bearing, 44 is a worm wheel, and worm 4
2 and a clutch gear 46 is inserted. 46
is a shaft gear (8) which meshes with the clutch gear 46, into which the main shaft 47 is press-fitted, and which also transmits power to the left side. 48 is a wiper arm (6), which meshes with the shaft gear (6) 46, and is inserted into the groove 4 of the arm part.
A boulder pin 49a protruding from the cassette holder 49 is inserted into 8a. 6o is the side plate (b)
There is an L-shaped groove 6oa, and the cassette boulder 49 moves horizontally and vertically along this groove 50a. 51 is an up detection switch, and 62 is a down detection switch, each of which is fixed to a fixed part, and wiper arm (6) 4
The switch is turned on and off by contacting the protrusions 48a and 4J3c provided at 8.

The operation of the cassette loading device configured as described above will be explained below.

First, before the cassette is inserted, the idler tire 28 is pressed onto the flywheel 24 by the eject spring 3o.

When the cassette 63 is loaded into the cassette holder 49 from the insertion port and further pushed in the horizontal direction (arrow A), the wiper arm 48 rotates clockwise. At this time, the up detection switch 61 and the down detection switch 62, which were pressed by the protrusions 4sb and 480 of the wiper arm (6) 48, are switched from on to off. In this state, the DC capstan motor 22 shown in FIG. 3 rotates counterclockwise. This rotation is transmitted to the flywheel 24 by the capstan belt 23, and the flywheel 24 also rotates counterclockwise. The idler lever 26 is pulled to the right by the eject spring 30 using the idler lever shaft 27 as a fulcrum, and the idler tire 28 is pulled to the right by the flywheel 24.
Since it is strongly crimped to the surface, rotation is transmitted through friction. This rotation is transmitted to the front loading pulley 31 by the eject belt 29, and thereafter the worm shaft 41, worm 42, and worm wheel 4 shown in FIG.
4. The holder pin 49a is moved via the clutch gear 46, shaft gear (R) 46, and wiper arm 48, and as a result, the cassette holder 49 is operated. The cassette holder 49 is guided by the L-shaped groove 50a of the side plate (6) 60, and is moved horizontally and then vertically. When the protrusion 48b of the wiper arm (6) 48 presses the down detection switch 62 and turns on, the DC capstan motor 22 stops and the cassette down is completed. After this, loading motor 33 (see Figure 3)
rotates counterclockwise, loading motor pulley 34
, the rotation is transmitted to the first loading belt 35, the intermediate pulley 36, the second loading belt 37, the large pulley 38, and the cam gear 39, and the cam gear pin 32b is moved into the cam groove 3.
9a, the main rod 32 moves to the left. At this time, the eject pin 26a is kicked to the left by the cam-shaped hole 32a, and the idler lever 26 also rotates to the left.

As a result, the idler tire 28 and the flywheel 24 are no longer in contact with each other, and even if the DC capstan motor 22 rotates, the rotation is not transmitted to the front loading pulley 31. When the main rod 32 moves to the left, the slide lever 40a also moves, and when the stop foil of the mode switch 40 is detected, the loading motor 33
stops, and therefore the main rod 32 also stops. This position is the stop position. Position to raise and lower the cassette, that is, position to operate front loading (
(This position is called the eject position), front loading does not operate because the idler tire 28 and flywheel 24 do not come into contact with each other. Next, when raising the cassette from the stop position, the loading motor 33 rotates clockwise, contrary to when it is lowered, and the loading motor pulley 34, first loading belt 35, intermediate pulley 36, and second loading belt 37 , the rotation is transmitted to the dog pulley 38 and the cam gear 39, and the cam gear pin 32
b is guided by the cam groove 39a, and the main rod 32 moves to the right. As a result, the eject bin 26a is released from being kicked by the large cam shape 32a, and the idler lever 26 is rotated to the right by the eject spring 30. As a result, the idler tire 28 is pressed against the flywheel 24. The main rod 32 moves to the right,
When the mode switch 40 is in the eject position, the loading motor 33 stops. Next, the DC capstan motor 22 rotates clockwise, and this rotation causes the capstan belt 23, flywheel 24, idler tire 28,
Eject belt 29, front loading pulley 3
1, and is transmitted to the wiper arm (R) 4 via the worm shaft 41, worm 42, worm wheel 44, clutch gear 46, and shaft gear 46 shown in FIG.
8 rotates counterclockwise. As a result, the holder pier 49a is connected to the L-shaped groove 5 of the side plate (R) ao.
0a, the cassette holder 49 rises vertically, and then moves horizontally to eject the cassette.

When the wiper arm (6) 48 rotates to the position where the protrusions 48b and 48C of the wiper arm (R) 48 push the up detection switch 61 and the down detection switch 62, and the switches 51 and 52 are switched from off to on, the DC Capstan motor 22 stops.

FIG. 6 shows the above operation in a timing chart.

Problems to be Solved by the Invention However, in the above configuration, the eject spring 30 is connected between the idler tire 28 and the flywheel 24.
The front loading is operated by the frictional force generated at this time, and if the ejecting spring 3o's pressing force is weak, slip will occur between the idler tire 28 and the flywheel 24, making it impossible to transmit power. For this reason, the idler tire 28 needs to be crimped to the flywheel 24 in order to be able to transmit the power that overcomes the front loading, and the load on the DC capstan motor 22 becomes extremely heavy. Also,
A capstan shaft is press-fitted into the flywheel 24 and supported by a bearing, but the conditions are harsh even for this bearing (metal) and its life span is shortened.

Furthermore, the DC capstan motor 22 is only rotated at a constant voltage, and the number of rotations changes sequentially due to changes in the load on the front loading side, making it difficult to obtain a stable operating time, and the operating time is also under heavy load. This has the problem of taking a very long time.

In view of the above-mentioned problems, the present invention reduces the load on the capstan motor, shortens the front loading operation time (the time required to raise and lower the cassette), and also reduces the variation in operation time due to the environment and differences between decks. To provide a cassette loading device that can reduce the amount of cassette loading.

Means for Solving the Problems To achieve this object, the cassette loading device of the present invention uses a DD capstan motor as a power source and uses gears as a method of transmitting power from the motor.

According to the above configuration, the lateral pressure load on the DD capstan motor is reduced, and the DD capstan motor is rotated under speed control, thereby shortening the operating time.
Variations in operating time due to differences in environment or decks can be reduced.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a cassette loading device in one embodiment of the present invention. In Fig. 1, 1 is a DD capstan motor, clockwise 2 rotates in both counterclockwise directions, and 02 is a drive gear that rotates together with the DD capstan motor 1, which has a two-stage configuration of a gear part and a V-pulley part. becoming 03
is a capstan belt, and 18 is a clutch pulley, which is used to wind the tape. Reference numeral 4 designates an idler lever, and an eject spring 8, which rotates around the idler lever shaft 2o as a fulcrum, rests on the idler lever 4 and a protrusion 7 provided on the fixed part. 0, which is being pulled to the right)
Reference numeral 6 denotes an idler gear, which rotates around an idler gear shaft 4a attached to the idler lever 4, and has a two-stage configuration of a gear portion and a V-pulley portion. Reference numeral 6 denotes an eject belt, which is stretched between the idler gear 6 and the front loading pulley 9 press-fitted into the worm shaft 41.

In the 4b escape bin, the idler lever 4 is being attacked by mosquitoes. The stopper pin 19 is provided in the fixed part,
The idler lever 4 acts as a counterclockwise counterclockwise rotation, and regulates the pitch distance between the drive gear 2 and the idler gear 5. 10 is a main rod in which a cam gear pin 10a is fitted, and an L-shaped cam-shaped hole 10b is provided, into which the eject bin 4b is guided. ◎11 is a cam gear, in which a cam groove 1
1a, on which a cam gear pin 10a is guided. The outer circumference of the cam gear 11 is a gear,
It meshes with relay gear 2. The relay gear 12 is a two-stage gear and meshes with the drive gear 13.

The drive gear 13 is also a two-stage gear and meshes with the motor pulley gear 14. The motor pulley gear 14 has a gear and a V
A loading belt 016 having a two-stage configuration of pulleys is placed between the V-pulley portion of the motor pulley gear 14 and the loading motor pulley 16. 17 is a loading motor into which a loading motor pulley 16 is press-fitted. 21 is a mode switch fixed to a fixed part, and a slide lever 21a is sandwiched between the main rod 1o so that when the main rod 10 moves from side to side, the slide lever 21a also moves in synchronization with the main rod 1o.
The position of each position of 0 can be detected accurately.

FIG. 2 is a sketch of the cassette loading device of the present invention.

The configuration after the worm shaft 41 is the same as the conventional configuration shown in FIG. 4, and both FIGS. 1 and 2 are views of the mechanical chassis inverted and viewed from the back.

The operation of the cassette loading device configured as described above will be explained below. Before inserting the tzu cassette,
Idler gear 6 and drive gear 2 are meshed. At this time, the idler lever 4 is pulled rightward by the eject spring 8, but it is in contact with the stopper bin 19, and the pitch distance between the idler gear 6 and the drive gear 2 is maintained at a normal pitch. When the cassette is loaded into the cassette holder 4 from the insertion slot and pushed further in the horizontal direction, the wiper arm (R) 4B rotates clockwise, and the up detection switch 6 pressed by the protrusions +ab and 4sc
1 and the down detection switch 62 is switched from on to off. Next, the capstan motor 1 rotates counterclockwise,
Drive gear 2 also rotates together. Since the idler gear 6 is meshed with the drive gear 2, this rotation is caused by the eject belt 6 and the front loading boo! 79. It is transmitted to the worm shaft 41 in this order, and thereafter the cassette holder 49 operates via the worm 42, worm wheel 44, clutch gear 45, shaft gear (R) 46, and wiper arm (R) 48 shown in FIG. Cassette holder 49 is a side play) @) 50 L-shaped groove 50 a
The wiper arm moves horizontally and then vertically. However, when the protrusion 48b of 48 presses the down detection switch 62 and the switch changes from off to on, the DD capstan motor 1 stops. Then, the cassette down is completed. Next, the loading motor 17 rotates counterclockwise, and the loading motor pulley 16
Rotation is transmitted to the loading belt 15, motor pulley gear 14, drive gear 13, relay gear 12, and cam gear 11 in this order, the cam gear pin 10a is guided by the cam groove 11a, and the main lot 1o moves to the left.

Then, the eject pin 4b is kicked to the left by the cam-shaped hole 1ob, the idler gear (-4) rotates to the left, and the idler gear 5 and drive gear 2 no longer mesh.When the main rod 1o moves to the left, the -4 rotates to the left. Slide lever 21a
When the stop foil of the mode switch 21 is detected, the loading motor 17 is stopped. This position is the stop position.

Next, when raising the cassette from the stop position,
When the loading motor 17 rotates clockwise, the loading motor 2-16. Rotation is transmitted to the loading belt 15, motor pulley gear 14, drive gear 13, relay gear 12, and cam gear 11 in this order, the cam gear bin 10a is guided by the cam groove 11a, and the main rod 1o moves to the right. Therefore, the cam-shaped hole 1ob that was kicking the eject pin 4b moves to the right, and the idler lever 4 is rotated υ counterclockwise by the eject spring 8 (stopper pin 19
until it hits ). Therefore, the idler gear 5 and the drive gear 2 come to mesh with each other. When the main rod 10 moves to the right and the mode switch 21 moves to the eject position, the loading motor 17 stops. Next, the DD capstan motor 1 rotates clockwise, and the drive gear 2,
Rotation is transmitted in the order of the idler gear 6, eject belt 6, and front loading pulley 9, and the worm shaft 41, worm 42, worm wheel 44, and worm wheel 44 shown in FIG.
The wiper arm (6) 48 rotates counterclockwise via the clutch gear 46 and shaft gear (R) 46.

For this reason, the cassette holder 49 moves vertically and then horizontally, and the cassette is ejected.

When the up detection switch 51 and the down detection switch 52 are pressed by the protrusions +sb and 4sc of the wiper arm (R) 4B and turned from off to on, the DD capstan motor 1 is stopped and the cassette setup is completed.

As described above, according to this embodiment, power is transmitted from the DD capstan motor using gears, and a stopper bin is provided to regulate the pitch distance between the gears, thereby reducing excess load due to side pressure. Furthermore, by applying speed control to the DD capstan motor and rotating it,
It is possible to shorten the operating time and stabilize the operating time due to differences in environment and decks.

In this embodiment, the eject belt 6 was used between the idler gear 5 and the front loading pulley 9 (see Fig. 1), but instead of the eject belt 6, a gear is meshed, and one of the gears is connected to the eject belt 6. may move up and down, and the power from the DD capstan motor 1 can be switched on and off.

Effects of the Invention As described above, the present invention provides D as a driving force for loading a cassette.
When using a D-capstan motor to transmit power from the motor, a stopper is provided to ensure accurate pitch distance, the gears are engaged, and the speed of the DD-capstan motor is controlled to reduce the load on the motor. The current can be extremely reduced, and the motor can rotate at a constant rate even if the load changes within the control range. For this reason, the lifespan of motors and bearings can be greatly extended, and the operating time can also be shortened. Furthermore, differences in load due to the environment (temperature, humidity, etc.), deck, cassette, etc. will hardly appear as a difference in operating time, so you can always The operation can be completed in a stable time, and its practical effects are great.

[Brief explanation of drawings]

Fig. 1 is a plan view of an embodiment of the cassette loading device of the present invention, Fig. 2 is a perspective view of the same embodiment, Fig. 3 is a perspective view of a conventional cassette loading device, and Fig. 4 is a side view of the same. be. 1...DD capstan motor, 2...
・Drive gear, 3...capstan belt,
4...Idler lever, 4a...Idler gear shaft, 4b...Eject pin, 6...
...Idler gear, 6...Eject belt, 7...Thrust receiver plate, 8...Eject spring, 9...Front loading pulley, 10 ...Main rod, 10a...
...Cam gear pin, 1ob...Cam shape hole, 1
1...Cam gear, 11a...Cam groove,
17...Loading motor, 18...
・Clutch pulley, 19...stopper pin,
20...Idler lever shaft, 21...
Mode switch, 21a...Slide lever,
22...DC capstan motor, 23...
... Capstan belt, 41 ... Worm shaft, 42 ... Worm, 43 ...
... Bearing, 44 ... Worm wheel, 46
...Clutch gear, 46...Shaft gear (6), 47...Main shaft, 48.
...Wiper arm (6), 48a...
Arm groove, 48b...Protrusion, 48c...
・Protrusion, 49...Cassette holder, 49a・
...Holder pin, 50...Side plate (6), 50a...L-shaped groove, 51...
... Up detection switch, 52. River... Down detection switch, 63... Cassette. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
+ Ya 7-Tan 7-Daku-1 "Rigegear f Tomain Lo, Do 1'F--Coude 4 Jig ℃-G4@2 Figure C Figure 3 Figure 4

Claims (1)

[Claims] A drive gear driven by a reversibly rotating capstan motor and an idler lever that rotatably holds the idler gear and are rotatable about a rotational fulcrum are engaged with the idler gear and the drive gear. means for elastically rotationally biasing the idler lever in a direction to rotate the idler lever, and a means for slidingly moving the main rod between a first position and a second position in accordance with the rotational direction of a reversibly rotating loading motor. and means for causing the idler lever to separate the idler gear and the drive gear against the urging force of the urging means when the main rod is slid to the first position, A cassette loading device characterized in that rotational force is used as a driving source for a cassette loading means.