JP2621393B2 - Pinch roller crimping device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch roller crimping apparatus which is most suitable for application to a recording / reproducing apparatus such as a video tape recorder and other various information processing apparatuses. .

[Summary of the Invention]

According to the present invention, after the pinch roller is pulled out to the crimping operation position beside the capstan by the drawer member, the pinch roller is crimped to the capstan by the crimp lever driven by the plunger solenoid. In the pinch roller press device, a single intermediate member having a cam groove engaged with the press lever is provided, and the press lever is separated from the capstan until the pinch roller is pulled out to the press operation position. To prevent the pressure lever from moving in the direction approaching the capstan, and move the pressure lever to a position close to the capstan when the pinch roller is pulled out to the pressure operation position. In addition, the pressure lever can be further moved in the direction approaching the capstan, so that the plunger solenoid is sucked. Stroke and can be reduced and in which the drawer to crimping operating position of the pinch roller pressure lever has to be prevented, such as inhibiting.

[Conventional technology]

2. Description of the Related Art Conventionally, as a pinch roller pressing device of a video tape recorder, for example, there is a device as disclosed in Japanese Utility Model Application No. 61-79838 filed by the applicant of the present invention.

As shown in FIGS. 6 and 7, this type of pinch roller pressing device pulls a pinch roller 1 from the inside of a tape cassette to a pressing position beside a capstan 2 by a pull-out member (neither is shown). Pull out in the direction of arrow a. Then, the magnetic tape 4 in the tape cassette is pulled out by the tape guide 3 which is drawn out in the direction of the arrow a together with the pinch roller 1 in a state preceding the pinch roller 1 and wrapped around the capstan 2. Thereafter, the movable iron core 6 of the plunger solenoid 5 is sucked in the direction of the arrow b, and the pressure levers 7 and 8 are returned around the fulcrum shaft 9 and driven to rotate in the direction of the arrow c against the spring 10. A pair of upper and lower flat crimping parts 11 and V of crimping levers 7 and 8
The groove-type crimping portion 12 presses the flanges 14 and 15 at both upper and lower ends of the pinch roller support shaft 13 in the direction of arrow c, and the pinch roller 1 presses the magnetic tape 4 to the capstan 2 in the direction of arrow c. is there. Then, the magnetic tape 4 is moved at a constant speed by the capstan 2 by this pressure bonding.
In practice, the pinch roller 1 is taken into the pressure levers 7 and 8 and pressed against the capstan 2 against the spring force of a pressure spring (not shown).

At this time, in the method shown in FIG. 6, when the pinch roller 1 is pressed against the capstan 2 by the pressing lever 7, the azimuth and tilt of the pinch roller 1 with respect to the capstan 2 are assembled on the outer periphery of the pinch roller support shaft 12. The automatic alignment is performed by an automatic alignment mechanism (not shown). Accordingly, there is no need to control the azimuth and tilt of the pinch roller 1 with the pressure lever 7.
Since the flange 14 only needs to be pressed, the crimping portion 11 of the crimping lever 7 is formed flat. And
According to this method, since only a small operation stroke of the pressure lever 7, it is possible to reduce the suction stroke S ₁ of the movable iron core 6.

On the other hand, in the method shown in FIG. 7, a pair of upper and lower V-groove type crimping portions 12 of the pressing lever 8 are fitted to outer peripheries of a pair of upper and lower flanges 15 of the pinch roller 1, and the pinch roller 1 is attached to the capstan 2. By pressing, the azimuth and tilt of the pinch roller 1 with respect to the capstan 2 can be regulated accurately. Therefore, in this method, the flat-type crimping portion 11 shown in FIG. 6 is moved so that the flange 15 of the pinch roller 1 pulled out in the direction of arrow a does not interfere with the V-groove-shaped crimping portion 12 of the crimping lever 8. compared to pressure lever 7 having a depth distance corresponding to the V grooves of the V-groove shaped crimping portion 12, it is necessary to increase the operation stroke of the pressure lever 8, correspondingly, the suction stroke S ₂ of the movable iron core 6
Need to be larger.

FIG. 8 is a graph showing the suction characteristics of the movable iron core of a general plunger solenoid. If the force f of the return spring 10 of the pressure bonding levers 7 and 8 is determined (note that in a portable video tape recorder, It is necessary to add the self-weight of the pressure lever or the movable iron core to the force f according to the posture at the time of use, etc.), and the plunger solenoid A required to suck the movable iron core 5 up to a large suction stroke S. Requires a large one, and if the suction stroke of the movable iron core 5 is only half (1 / 2S), the plunger solenoid B required for it can be a small one.

[Problems to be solved by the invention]

In the conventional pinch roller pressing device shown in FIG. 6, the plunger solenoid 5 may be small, which is advantageous for reducing the size and weight of the video tape recorder. However, on the other hand, if the thickness of the magnetic tape 4 to be used is thin, the azimuth and tilt of the pinch roller 1 due to the self-alignment become inaccurate, and the edge of the magnetic tape 4 is damaged in a wrinkle-like manner, or the running magnetic tape 4 There is a problem that the center of No. 4 tends to fluctuate in the tape width direction and the tape running becomes unstable.

In the conventional pinch roller pressing device shown in FIG. 7, the azimuth and tilt of the pinch roller 1 can be accurately regulated by the V-groove type pressing portion 12 of the pressing lever 8, so that the thin magnetic tape 4 is not damaged. It can run stably and is currently the mainstream system. However, on the other hand, there is a problem that the plunger solenoid 5 becomes large, which is disadvantageous for reducing the size and weight of the video tape recorder.

On the other hand, in the pinch roller crimping device of the portable video tape recorder, since it is particularly important that the power consumption is low, a self-holding type plunger solenoid for attracting and holding the sucked movable iron core 6 to the magnet is used. Often used. However, self-holding plunger solenoids do not require current to flow through the solenoid.
When the movable iron core approaches the magnet for a certain distance or more, the movable iron core is easily attracted to the magnet unexpectedly. When the pinch roller 1 is moved back into the tape cassette or when the pinch roller 1 is being pulled out to the crimping operation position beside the capstan 2, the movable iron core 5 may be unexpectedly attracted to the magnet. 6 and FIG. 7, the pressure levers 7 and 8 are unexpectedly rotated in the direction of arrow c in FIGS. 6 and 7 and unexpectedly enter the pull-out path of the pinch roller 1, and FIGS. 7, the pinch roller 1 pulled out in the direction of the arrow a interferes with the pressure bonding levers 7 and 8,
There is a problem that the pinch roller 1 cannot be pulled out to the crimping operation position.

Therefore, the present invention provides a pinch roller pressing device that can reduce the suction stroke of the plunger solenoid and prevent the pressing lever from unexpectedly obstructing the pulling of the pinch roller to the pressing operation position. The purpose is.

[Means for solving the problem]

In order to achieve the above object, a pinch roller press device of the present invention has a cam groove that engages with the press lever, and is moved and urged in a predetermined direction by an urging means, thereby pressing the press lever. A single intermediate member for urging the pressing lever to move to a position separated from the capstan to prevent the pressing lever from moving in a direction approaching the capstan; and By moving the intermediate member against the urging means when pulled out to the crimping operation position, the crimping lever is moved to a position close to the capstan and the crimping lever is moved closer to the capstan. And an intermediate member drive unit provided on the drawer member so as to be further movable in the direction of movement.

(Operation)

The pinch roller pressing device configured as described above drives the pressing lever from the position separated from the capstan to the capstan by driving the intermediate member by the intermediate member driving portion of the drawer member that pulls the pinch roller to the pressing operation position. Since the plunger is moved to the close position, the operation stroke of the plunger solenoid driven by the plunger solenoid to press the pinch roller against the capstan can be reduced.
Therefore, the suction stroke of the plunger solenoid can be reduced.

Further, the pinch roller pressing device prevents the pressing lever from moving in the direction approaching the capstan by the intermediate member and the urging means until the pull-out member finishes pulling the pinch roller to the pressing operation position. Therefore, during the pulling of the pinch roller to the pressing operation position, the pressing lever does not unexpectedly enter the drawing path of the pinch roller. Therefore, it is possible to prevent the pressure lever from unexpectedly obstructing the pulling of the pinch roller to the pressure operation position.

〔Example〕

Hereinafter, an embodiment of a pinch roller pressing device in which the present invention is applied to a video tape recorder will be described with reference to the drawings.

First, the outline of the pinch roller pressing device will be described with reference to FIG.

First, a pinch roller lever 19 on which a pinch roller 17 is rotatably mounted via a pinch roller support shaft 18 is supported by a fulcrum shaft.
A tape guide 22 and a positioning pin 23 are mounted on the slider 21 so as to be rotatable. The pinch roller lever 19 is urged by an urging spring 24 to rotate about the fulcrum shaft 20 in the direction of arrow d. The slider 21 is slidably mounted on the loading guide plate 25, and one of the two guide grooves 25a, 25b provided on the loading guide plate 25 has the tape guide 22 and the positioning pin 23 in one of the guide grooves 25a, 25b. The lower end is loosely fitted, and the guide pin 26 attached to one side of the lower end of the pinch roller support shaft 18 is loosely fitted in the other guide groove 25b.

A drawer member 28 reciprocally driven in the directions of arrows e and e 'around a fulcrum shaft 27 by a motor (not shown) drives the slider 21 in the direction of arrow e via a link 29. , The slider 21 is slid on the loading guide plate 25, and the pinch roller 17 and the tape guide 22 are moved.
Are drawn in the direction of the arrow a from the inside of the tape cassette 30 shown by the dashed line to the crimping operation position beside the capstan 31 shown by the solid line. In addition, pinch roller
When the 17 is pulled out to the crimping operation position, the positioning pin 23 is pressed into the V groove 32a of the positioning block 32, and the slider 21 is positioned. Further, the guide pin 26 enters the large hole 25c at the tip of the guide groove 25b shown in FIG. 2A.

Then, the tape cassette 22 is drawn by the tape guide 22 which is drawn out in the direction of arrow a before the pinch roller 17.
The magnetic tape 33 in 30 is drawn out and wrapped around the capstan 31 and the magnetic head 34.

Thereafter, the movable iron core 36 of the plunger solenoid 35 is sucked in the direction of arrow b, and the pressure lever 39 connected via the pin 37 and the elongated hole 38 returns to the fulcrum shaft 40 against the spring 41. And is rotated in the direction of arrow c. And
A pair of upper and lower V-groove crimping portions 42 of the pressing lever 39 presses a pair of upper and lower flanges 43 fixed to both upper and lower ends of the pinch roller support shaft 18 in the direction of arrow c, and the pinch roller 17 caps the magnetic tape 33. Crimp to 31. Then, the magnetic tape 33 is caused to travel at a constant speed by the capstan 31 by this pressure bonding.

At this time, as shown in FIGS. 4 and 5, a pair of upper and lower V-groove crimping portions 42 of the crimping lever 39 are fitted to the outer peripheries of a pair of upper and lower flanges 43 of the pinch roller 17,
By pressing the pinch roller 17 against the capstan 13, the azimuth and tilt of the pinch roller 17 with respect to the capstan 31 can be regulated accurately.

Also, as shown in FIG. 4 and FIG.
Is rotatably supported by a fulcrum shaft 40 and a pin is
Crimping lever drive side 39a connected via 37 and long hole 38
And a pressure lever driven side 39b, which is rotatably supported by a fulcrum shaft 40 and has a pair of V-groove-shaped pressure-bonding portions 42 provided on the upper and lower ends thereof. And one end
The other end 44b of the crimping force adjusting screw 44 rotatably mounted on the crimping lever drive side 39a is penetrated through a through hole 45 provided on the crimping lever driven side 39b, and is locked by a washer 46. A compression spring 48 is compressed and fitted around the outer periphery of the crimping force adjusting screw 44 between the nut 47 screwed to the force adjusting screw 44 and the crimping lever driven side 39b.

Accordingly, the crimp lever 39 is rotated in the direction of arrow c by the movable iron core 36 sucked in the direction of the arrow b in the order of the crimp lever driving side 39a, the crimp spring 48, and the crimp lever driven side 39b in the order of the arrow c. The pinch roller 17 is pressed against the capstan 31 against the compression repulsion force of 48. And crimping force adjusting screw
The nut 47 can be moved in the axial direction by adjusting the rotation of the nut 44 to adjust the spring force of the compression spring 48.

The plunger solenoid 35 is configured as a self-holding plunger solenoid that attracts and holds the movable iron core 36 to the magnet when sucked in the direction of arrow b.

Next, with reference to FIG. 1A to FIG. 4, the main part of the pinch roller pressing device will be described.

First, an intermediate member 51 is provided below the plunger solenoid 35.
Are rotatably mounted in the directions of arrows f and f 'via a fulcrum shaft 52. The intermediate member 51 is rotationally urged in a predetermined direction indicated by an arrow f 'by a return spring 53 as urging means, and is stopped by contacting the stopper 54. A guide pin attached to the arm 39c of the driven side 39b of the pressure bonding lever 39 is inserted into a cam groove 55 provided in the intermediate member 51.
56 is loosely fitted. The pin-shaped intermediate member drive unit 57 attached to the upper part of the drawer member 28 is configured to abut on one side surface 51a of the intermediate member 51 from the direction of arrow e. Then, as shown in FIG. 3, the cam groove 55 is
52 and the first arcuate portion 59 of large radius R ₁ centered on, a second arcuate portion 60 of smaller radius R _2, connecting between the connecting portion
61 and an opening 62 which is largely opened on the side near the fulcrum shaft 52 of the second arc portion 60.
The first guide surface 63 is formed on the side closer to the first circular arc portion 59-.
A side of the connecting portion 61-the second arc portion 60 far from the fulcrum shaft 52 is formed as a second guide surface 64.

Then, when the pinch roller 17 is moved back into the tape cassette 30 shown in FIG. 5, or when the pinch roller 17 moves toward the crimping operation position beside the capstan 31 shown by a solid line in FIG. 1A, the intermediate member 51 is urged by a return spring 53 to rotate in the direction of arrow f '.

Then, as shown by a solid line in FIG. 3, the guide pin 56 enters the first arc portion 59 of the cam groove 55 and is urged by the first guide surface 63 to move in the direction of arrow c ′. As a result,
As shown in FIG. 2A, the pressure bonding lever 39 is rotated in the direction of arrow c 'and moved to a position separated from the capstan 31.

At this time, since the movement of the guide pin 56 shown by a solid line in FIG. 3 in the direction of arrow c is restricted by the first guide surface 63, the pressure lever 39 is moved from the position shown in FIG. 2A. It cannot move in the direction approaching the capstan 31, that is, in the direction of arrow c. Therefore, the movable iron core 36 of the plunger solenoid 35 is prevented from being accidentally attracted to the magnet due to some inconvenience.

Then, as shown in FIGS. 1B and 2B, when the pinch roller 17 is pulled out to the crimping operation position beside the capstan 31 by the drawer member 28 driven to rotate in the direction of arrow e (actually, From immediately before), the intermediate member drive member 57 of the drawer member 28 abuts one side surface 51a of the intermediate member 51, and rotates the intermediate member 51 in the direction of arrow f against the return spring 53.

Then, the guide pin 56 located at the position shown by the solid line in FIG. 3 is guided by the second guide surface 64 of the cam groove 55, and moves from the first arc portion 59 to the connection portion 61 as shown by the dashed line. And is moved in the direction of the arrow c by the distance l (l = R ₁ −R ₂ ) to the second arc portion 60. As a result, as shown in FIG. 2B, the pressure lever 39 is rotated in the direction of arrow c and moved to a position close to the capstan 31. In conjunction with this, the movable iron core 36 of the plunger solenoid 35 is also moved in the direction of the arrow b.

At this time, as shown by a chain line in FIG. 3, the guide pin 56 enters the opening 62 of the cam groove 55 and can move in the direction of arrow c. From the position shown in the figure, it becomes possible to move in the direction approaching the capstan 31, ie, the direction of arrow c.

Thereafter, as shown in FIGS. 1C and 2C, when the movable iron core 36 of the plunger solenoid 35 is sucked with a small suction stroke in the direction of arrow b, the pressure bonding lever 39 is driven to rotate in the direction of arrow c. Then, the pinch roller 17 is pressed against the capstan 31.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, the intermediate member 51 is configured as a rotating lever type, but may be configured as a linear slide type.

Further, the present invention is applicable to a recording / reproducing device such as a video tape recorder and other various information processing devices.

〔The invention's effect〕

The present invention is configured as described above, and has the following effects.

The operation stroke of the pressure lever by the plunger solenoid can be reduced, and the suction stroke of the plunger solenoid can be reduced. This is effective in a pinch roller pressing device using a lever, and can reduce the size of a plunger solenoid, thereby reducing the size and weight of a video tape recorder or the like.

Since the pressing lever does not unexpectedly enter the drawing path of the pinch roller during the pulling of the pinch roller to the pressing operation position, it is particularly effective in a pinch roller pressing device using a self-holding plunger solenoid. The pinch roller can be prevented from unexpectedly obstructing the pinch roller from being pulled out to the crimping operation position, and the pinch roller can be drawn out to the crimping position and the subsequent pinch roller crimping operation to the capstan accurately. I can do it.

Providing a single intermediate member having a cam groove engaged with the pressure lever and being urged to move in a predetermined direction by urging means,
When the pinch roller is pulled out to the crimping operation position, the crimp lever is controlled to move to the position close to the capstan, and the crimp lever moves in the direction close to the capstan until the pinch roller is pulled out to the crimping position. Since this is prevented, the structure of the pinch roller pressing device can be simplified.

[Brief description of the drawings]

FIGS. 1A to 5 show an embodiment of the present invention, and FIGS. 1A to 1C and FIGS. 2A to 2C show the operation of the main part of a pinch roller press device. FIG. 3 is a plan view, FIG. 3 is a plan view showing an intermediate member of the pinch roller pressing device, FIG. 4 is a perspective view showing a main part of the pinch roller pressing device, and FIG. 5 shows the entire pinch roller pressing device. It is a top view. 6 and 7 are schematic plan views showing a conventional example, and FIG. 8 is a graph showing suction characteristics of a plunger solenoid. In the reference numerals used in the drawings, 17: pinch roller 31: capstan 35: plunger solenoid 36: movable iron core 39: pressure bonding lever 42: V-groove type pressure bonding portion 51: intermediate member 53 return spring (biasing means) 55 cam groove 63 first guide surface 64 second guide surface

Claims (1)

(57) [Claims] A pull-out member for pulling out a pinch roller to a pressing operation position beside a capstan; and a pressing lever driven by a plunger solenoid to press the pinch roller against the capstan after the pinch roller is pulled out. A pinch roller pressing device comprising: a cam groove engaged with the pressing lever; and a position in which the pressing lever is separated from the capstan by being urged to move in a predetermined direction by an urging means. A single intermediate member for urging the pressing lever to prevent the pressing lever from moving in the direction approaching the capstan, and when the drawer pulls out the pinch roller to the pressing operation position, By moving the intermediate member against the urging means, the pressing lever is moved closer to the capstan. A pinch roller provided with an intermediate member drive unit provided on the drawer member so as to move the pressure lever to a position closer to the capstan and to further move the pressure lever in a direction approaching the capstan. Crimping device.