JPS59207046A - Pinch roller operating device - Google Patents

Abstract

PURPOSE:To make the whole of a recording and reproducing device small-sized and light-weight by using one driving source to perform a series of operations such as movement of a pinch roller from the initial position to the holding position of pressing, pressing of the pinch roller to a capstan after this movement, etc. CONSTITUTION:When an electric power source of the device is turned on and a loading gear 2 starts rotating clockwise by the driving source which is not shown in the figure, a gear 13 engaged with the loading gear 2 is rotated counterclockwise, and then, a gear 16 is rotated counterclockwise also through a timing belt 15. Strengths of springs 33 and 25 are so set that the force transmitted to the gear 16 acts in the direction, where a gear 20 is rotated, through an epicyclic gear 18 and the gear 20 is rotated clockwise with a gear 21 immobile. A pinch roller base 8 is moved in the direction of an arrow A through gears 26 and 28. When the pinch roller base 8 reaches a position where a shaft 6 is held by a catcher 35, namely, the pressing holding position of a pinch roller 3, the pinch roller base 8 cannot be moved furthermore in the direction of the arrow A.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a pinch/row 2 operating device, that is, a pinch/row used in a recording/reproducing device using a strip-shaped recording medium such as an F'LVTR (video tape recorder). A trace of something.

(Prior art) Conventionally, for example, in a VTR, etc., the movement of the pinch roller from the initial position to the pressing position was performed using power from a tape loading motor, and the pinch roller was pressed against the capstan. A configuration in which electromagnetic force is used using a solenoid is common, but in such a configuration, the drive sources for the pinch roller, movement, and pressure welding are different, so it is difficult to make the device lighter, smaller, or more compact. There is also a method of applying pressure to the Yapstan and disconnecting it, but for example, as tape cassettes become smaller, the overall size of the device becomes smaller in terms of the structure and size of the cassette, as well as the tape transport bus. In order to achieve this, it becomes necessary to move the pinch roller.

(Purpose) In view of the above circumstances, the present invention utilizes a single drive source to perform a series of operations such as moving the pinch roller from its initial position to the press-contact standby position, and then press-contacts it against the capstan. The main purpose of this invention is to provide a new pinch roller operating device that can greatly contribute to the miniaturization and weight reduction of the entire sickle reproducing device as described above.

(Example) Preferred examples of the present invention will be described below with reference to the attached garden.

First, an embodiment of the present invention will be described with reference to FIGS. 1 to 4.
(FIG. 1) The drum assembly 2 is a gear for tape loading, and can be rotated by a drive source (not shown). 3 is a pinch Φ row; yT, which is rotatable around a shaft 4, and the shaft 4 is fixed to the pinch row 2 arm 5. The arm 45 is rotatable around a shaft 6 (FIG. 4), and the shaft 6 is fixed on the two binchi rows 8.

7 is a low 29w knit and is fixed on the shaft 6. 9
is the capstan shaft, and the pinch roller arm 5 mentioned above
Normally, the pinch roller 6 is biased and held in a direction so as not to come into contact with the capstan shaft 9 by a spring and a stopper (not shown). The aforementioned two pinch row units 8 move the pinch row: lP3 from the initial position shown by the two-point MI line in FIG. This is the first movable member for moving the rail 1. It can move freely along the lines o and ii. 12 (FIG. 1) is rotatable about an axis 14 fixed on the tape seat 22.

15 is the timing belt, 16 to 21 are a! It is a gear unit.

Details of the planetary gear units 16 to 21' will now be explained with reference to FIG. 6. The gear 16 is rotatable around a shaft 17 fixed on the chassis 22, and is driven in rotation via a timing belt 15 stretched between the lower gear portion 161) and the lower gear 13b of the gear 16. The planetary gear 1 is capable of rotating a shaft 19 fixed to the lower surface of the gear 21, and meshes with the upper gear portion 16& of the gear 16 and the inner gear 20a of the gear 20. gear 20
and 21 are capable of rotating the gear 16 and the shaft 17, respectively.

In FIG. 2, reference numeral 26 denotes a stopper for the two pinch rows 8, which is rotatable about the shaft 24 and biased by a spring 25 in the direction of 6I. The gears 26 and 28 are rotatable around shafts 27 and 29, respectively, and the gear 26 is connected to the outer peripheral gear 201) of the gear 20 and the gear 28.
In addition, the gear 2B is meshed with a notch 8a on the side of the two pinch Φ row units B. 30 is cassette 1
This is one of the bottles that supports 2. Roll 1 is pinch roller 6
The pressure contact lever is a second moving member for contacting the capstan 9 with pressure, and is engaged with the gear 21 at the gear 31- on the side thereof, is movable on the rail 52, and is moved by a spring 66. It is energized in the direction of arrow B' in FIG. The torque applied to the gear 21 by this spring '53 is larger than the torque applied to the gear 20 via the gears 26 and 28 because the stopper 25 holds down the pinch roller stand 87). 64 is a stopper for the lever 31, and one end of the spring 63 is hung thereon.

65 is a catcher for the shaft 6.

In this configuration, when the device is powered on and the loading shaft gear 2 begins to rotate clockwise by a drive source (not shown), the gear 13 meshing with it rotates counterclockwise, thereby causing the timing belt to rotate. Gear 16 also rotates counterclockwise via gear 15. Here, by setting the strengths of spring 63 and spring 25 so that the torque required to rotate gear 21 is greater than the torque required to rotate gear 20, the torque is transmitted to gear 16. The applied force acts in a direction to rotate the gear 20 via the planetary gear 18, and the gear 20 rotates clockwise while the gear 21 remains stationary. Then, the two pinch rows B are moved in the direction of the arrow through gears 26 and 28. The position where the shaft 6 is held by the catcher 55, that is, the position in FIG.
When the pinch rows 23 reach the pressure welding timing position shown by the solid line, the two pinch rows 8 can no longer move in the input direction. Also, at this time, the bottle 26& of the stopper 2!1 enters the recess 80 on the tail end side of the pinch heat roller 2 unit B and pinch-
Hold the two rowers 8 in this position. At this point, gear 2
The driving torque required by the gear 20 driving the pinch roller table 8 via the pin 6.28 is much greater than the driving torque required by the gear 21, so that the gear 20 acts as if it were fixed. Because of this, the power from the gear 16 causes the planetary gear 18 to rotate counterclockwise around the rotation of the gear 16, and at the same time, the shaft 19 is fixed and the gear 2 is rotated.
1 can now be rotated counterclockwise. As a result, the pressure contact lever ′ that meshes with the gear 21
51 moves on the rail 32 in the direction of arrow B, and at its terminal position, it hits the bottle 51b, pushes the pinch-row 2 arm 5 part 5IL, rotates it clockwise around the shaft 6, and so on. Thus, the pinch roller 3 is pressed against the capstan shaft 9. Then, loading gear 2
When it reaches a predetermined position to complete the four-way loading, its phase is detected by well-known means (not shown) and the power is turned on.
It is turned FF and loading ends (Fig. 2). Note that T in FIG. 2 indicates a tape pulled out from the cassette 12 and loaded.

Conversely, in the case of Qigu unloading, the loading gear 2 is rotated counterclockwise υ, and the gear 16 is rotated clockwise via the gear 13 and timing belt 15.

At this time, looking at the torque relationship between gears 20 and 21, gear 2
1 tries to rotate clockwise due to the force from the lever 31 which is receiving a force in the direction B' due to the spring 33,
Since the pinch roller base 8 of the gear 20 is held down by the stopper 26, a certain amount of silk is required for the gear 20 to return to the A' direction. The torque required to rotate the pawl υ gear 21 is smaller than the torque required to rotate the gear 20. Therefore, the gear 21 first rotates clockwise, which causes the pressure contact lever 31 to rotate. is returned in the direction B' and stops when it hits a stopper 64. In this state, the torque required to rotate gear 21 is greater than the torque required to rotate gear 20,
Therefore, the gear 20 is now rotated counterclockwise to the gear 26.
The two pinch rows 8 are returned to the direction A' via the angle 29.

When the two pinch rows 8 are returned to the predetermined initial position,
The bottle 26 of the stopper 26 fits into the four parts 8b provided on the side of the tip and is lightly held. At this time, the phase of the gyrloading gear 20 is detected by well-known means (not shown), the power is turned off, and tape unloading is completed.

Next, another embodiment will be explained with reference to FIGS. 5 and 6. This embodiment is an example in which a rotary lever is used to push the vintage roller ahem 5. In the figure, parts that are the same as those described above are indicated by the same symbols.
r! , which shows the initial state before tape taping. The pulley 66 replaces the gear 21 of the previous embodiment, and is rotatable around the shaft 17, and has the pin 36a and the shaft 19 fixed to its upper and lower surfaces, respectively. pinch·
The second movable member bar for roller pressure contact, <-67 is the shaft 6
It can be rotated around B, and a part of it has a bin 37.
& is fixed. The shaft 38 is fixed on the chassis 22. The spring 39 biases the lever 37 in a counterclockwise direction around the 5th axis. Reference numeral 40 denotes a stopper for the pulley 36, which is rotatable about a shaft 41 and biased counterclockwise by a spring 42 about the eave 41. The pin 40a fixed on the stop /-40 engages with the four circumferential portions 36b of the pulley 66 to lock the pulley 66.

In the above configuration, in the initial state, the pin 40& of the stopper 40 is engaged with the recess 36b of the pulley 66.

Then, tape loading begins and loading-
When the gear 2 rotates clockwise, the power transmitted to the gear 16 is not transmitted to the gear 20 because the pulley 66 is restrained by the pin 40a of the stopper 40 with a relatively strong force.
As a result, the pinch roller stand 8 is moved in the inward direction and pulled out until it collides with the catcher 65 in the same manner as in the previous embodiment. Thereafter, the pulley 66 rotates counterclockwise using the same principle as in the previous embodiment, and the bin roller 6a rotates the lever 67 clockwise, which in turn rotates the pinch roller arm 5 clockwise. Teping Law 2
6 is pressed against the capstan shaft 9.

Conversely, in the case of tape unloading, lever '5
7 tries to return due to the biasing force of spring 69, so push 6
6 rotates clockwise, and when the pin 40a of the stopper 40 engages with the recess tl:ζ36b of the pulley 66, the gear 2
0 is rotated counterclockwise, the pinch roller base 8 moves in the A' force direction 7Q, and is moved to the initial position where the pin 23a of the stopper 26 is force-engaged with the recess 11 [i8b]. be stopped.

Here, if the pinch row 26 is brought into pressure contact with the gear 21 via the slide lever 61 as in the first embodiment shown in FIGS. 1 to 4, a large load will be applied to the white surface of the gear 21. In consideration of this, in the second embodiment shown in Figs. 5 and 6, the load is reduced by the lever ratio by using the rotary lever 37, and the load is reduced by the lever ratio rather than by the south face of the gear. Push this lever 57 +1
・It is designed to give strength.

Incidentally, in the embodiment described above, gears 26 and 29 were used in the drive path for the two pinch and row units due to the space, but these were omitted and the 1α contact pinch Q roller unit 8 was driven by the gear 20. It's okay.

Furthermore, although the timing belt 15 is used to transmit power from the drive source, this may be replaced with gears or other means may be used. Further, the time difference between the movement of the pinch roller and the pressing can be variously reduced by decelerating or increasing the speed using the residual gear.

In addition, if the time difference is too large to be covered by gears alone, a mechanism for attaching and detaching remaining gears, such as loading gear 2 and gear 16, using a cam or the like may be provided.
．． Also, in the examples, bottles 23&, 311+.

Contact with other members such as 36a, 37a, 4Da, etc.-j7. I
By reducing the frictional force of the ff material using rollers, etc., unnecessary twisting and driving force can be reduced.

(effect〕 .

As detailed above, according to the present invention, the movement of the pinch skewer row 2 from the initial position to the pressure welding time position and the subsequent pressure welding to the capstan can be performed with a very simple and compact configuration. It is possible to perform a series of operations using one drive source, and this allows VT)
This can greatly contribute to the reduction in size and weight of the entire production device, and is extremely useful in this type of device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic arrangement of main parts related to the present invention in a first embodiment of the present invention. FIG. 2 is a diagram showing details of the main parts of the arrangement shown in the first diagram. FIG. 6 is a sectional view taken along the line xx in FIG. 2. FIG. 4 is a YY cross-sectional view in FIG. 2. FIG. 5 is a diagram showing details of the main parts of the second embodiment of the present invention, corresponding to FIG. 0.Rotating head drum assembly, 211@
6 @ @ Tape, loading, gear, roller... 0 pinch 110-wo, 5, III... pinch, low 2, arm, 8... ), 9- Rumor... Capstan shaft, I O,
11,32--Guide-rail, 16-21.16
~20.3<5-11... Drive mechanism (planetary gear mechanism)
, 18...- Yusei 100m161, Ro7... Race 2
Movable member (pinch roller pressure contact lever), 23.4
2...Stone-136...■ Spring, 12.
...Tape-cassette, T...-φtete.

Claims (1)

[Scope of Claims] (1) A first movable electrical phase capable of moving iJJ to move the pinch roller from the initial position to the pressure contact time position with respect to the capstan, and a pinch roller at the pressure contact time position. A second movable member that is movable in order to move to the pressure contact position with respect to the capstan, and a second movable member that is connected to both the first and second movable members and receives a driving force from a drive source. First, the first movable member is driven, and after the pinch roller reaches the pressing timing position by the movement of the first re-moving member, the second movable member is moved to press the pinch roller against the capstan. A pinch roller operating device comprising a drive mechanism for driving a movable part. (2) comprising a blocking member for blocking movement of the first movable member at the pressing time position of the pincer roller;
In this case, the drive mechanism is configured to start driving the second movable member when the driving load of the first movable member exceeds a predetermined value.
The pinch roller operating device according to item 1). (6) The pinch roller operating device according to claim (2), wherein the drive mechanism includes a planetary gear pseudo structure.