JPH082822Y2 - Pinch roller device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is applied to, for example, a recording / reproducing apparatus such as a data recorder and a VTR, and a pinch roller for crimping a magnetic tape to a capstan by a pinch roller using a crimp arm. It relates to the device.

[Outline of device]

The present invention rotatably mounts a pinch roller via a pinch roller shaft to a pinch roller arm that is rotatably mounted to a loading arm via a support shaft. In a pinch roller device that presses the magnetic tape to the capstan with pinch rollers on the outer circumference of the pinch roller shaft by pressing the vicinity of both upper and lower ends of the shaft from the side, rotate the pinch roller arm with play on the outer circumference of the support shaft. Freely attach and press the pinch roller arm to the loading arm with the elastic force of the spring to hold the pinch roller parallel to the capstan, so that the magnetic tape can be attached immediately after the magnetic tape is attached to the capstan. It is designed to be able to run normally.

[Conventional technology]

Conventionally, as a pinch roller device in a recording / reproducing device such as a cassette type data recorder or a VTR, as shown in, for example, Japanese Utility Model Laid-Open No. 62-190934, the one shown in FIGS. 4 to 6 is used. is there.

In this conventional pinch roller device, a magnetic tape 3 is pressure-bonded by a pinch roller 4 to a side surface of a capstan 2 vertically provided on a horizontal chassis 1.
The magnetic tape 3 is driven and driven by the pinch roller 4 and the pinch roller 4 is pressure-bonded to the capstan 2 by the pressure-bonding arm 5.

Then, on the tip of a horizontal loading arm 7 rotatably mounted on the chassis 1 via a vertical rotary shaft 6, a horizontal pinch roller arm 9 is mounted via a vertical support shaft 8.
Is rotatably mounted, and the pinch roller 4 is rotatably mounted on the outer periphery of a pinch roller shaft 10 vertically mounted on the tip of the pinch roller arm 9 via a pair of upper and lower bearings 11. A pair of upper and lower discs 12 fixed to the outer periphery of the pinch roller shaft 10 near the upper and lower ends are disposed above and below the pinch roller 4. A loading guide 13 is rotatably attached to the outer periphery of the support shaft 8 on the pinch roller arm 9. Then, the lower end 10a of the pinch roller shaft 10 is provided with a fool hole 14 provided in the pinch roller arm 9.
It is loosely fitted inside and is supported by a pair of upper and lower washers 15.

In addition, the crimping arm 5 is a fulcrum shaft 17 which is perpendicular to the chassis 1.
A pressure-bonding member 19 is attached to the side surface of the pressure-bonding arm 5 via an azimuth adjusting member 18 via the azimuth adjusting member 18. The crimping member 19 is substantially U-shaped, and a pair of upper and lower V-shaped crimping surfaces 20 are provided on the tip surfaces of the pair of upper and lower horizontal pieces 19a. Then, the vertical piece 19b of the crimping member 19 is rotatably attached to the azimuth adjusting member 18 via a horizontal fulcrum shaft 21 for automatic alignment in the tilt direction A, and the azimuth adjusting member 18 is attached to the crimping arm 5 in the azimuth direction B. Horizontal fulcrum axis 22
It is configured to be rotatably attached via and is fixed by a pair of fixing screws 23. A drive means 24 such as an electromagnetic device for rotating the pressure bonding arm 5 and a rotary stopper 25 for the loading arm 7 are provided on the chassis 1.

 Next, the operation will be described.

When the cassette (not shown) is mounted on the recording / reproducing apparatus, the loading arm 7 is moved by the driving means (not shown) about the rotary shaft 6 from the position indicated by the dashed line to the position indicated by the solid line in FIG. Is rotated in the direction of arrow a until it abuts on the stopper 25 and is stopped. At this time, by the preceding loading guide 13 on the pinch roller arm 9 which is moved from the position indicated by the alternate long and short dash line in FIG. 4 to the position indicated by the solid line in FIG. 4 by the support shaft 8 of the loading arm 7, The magnetic tape 3 is pulled out to a position where it is loaded on the capstan 2 as shown in FIG. 4, and the pinch roller 4 is located on the capstan 2 and at a position shown by a chain line in FIG.
Moved to and from 19. After the loading of the magnetic tape 3, the crimping arm 5 is rotated by the driving means 24 in the direction of arrow b from the position indicated by the alternate long and short dash line in FIG. 4 to the position indicated by the solid line in FIG. The pair of upper and lower V-shaped crimping surfaces 20 of the crimping member 19 are the pair of upper and lower discs of the pinch roller shaft 10.
12 side faces are engaged from the direction of arrow b, and pinch roller shaft
The upper and lower ends of 10 are pressed in the direction of arrow b, and the pinch roller arm 9 is rotated around the support shaft 8 in the direction of arrow b,
The magnetic tape 3 is pressed against the side surface of the capstan 2 by the pinch roller 4. At this time, the capstan 2 is, for example, an arrow c.
From the moment when the magnetic tape 3 is already rotationally driven in the direction, and the magnetic tape 3 is pressed against the capstan 2 by the pinch roller 4, the magnetic tape 3 is driven and driven by the capstan 2 in, for example, the direction of arrow d, and desired recording is performed. And / or regeneration is performed.

[Problems to be solved by the device]

In this conventional pinch roller device, the parallelism of the pinch roller 4 with respect to the capstan 2 in the tilt direction A is performed by an automatic centering action which is a rotating action in the tilt direction A around the fulcrum shaft 21 of the crimping member 19. The lower end 10a of the pinch roller shaft 10 is loosely fitted in the back hole 14 of the pinch roller arm 9 so that this self-aligning action can be performed.

On the other hand, the parallelism of the pinch roller 4 in the azimuth direction B with respect to the capstan 2 is determined by engaging the pair of upper and lower V-shaped crimping surfaces 20 of the crimping member 19 with the side surfaces of the pair of upper and lower discs 12 of the pinch roller shaft 10. This is performed by the function of straightening the pinch roller shaft 10 so as to be parallel to the capstan 2 by the pair of upper and lower V-shaped crimping surfaces 20. The parallelism in the azimuth direction B is previously adjusted by the azimuth adjusting member 18. You need to do it.

The adjustment in the azimuth direction B is performed by rotating the crimping member 19 in the azimuth direction B about the fulcrum shaft 22 with respect to the crimping arm 5 by the azimuth adjusting member 18, and then adjusting the azimuth adjusting member 18 with a pair of screws. Fix with 23, but crimp member 19
Therefore, it is necessary to work with the pinch roller 4 pressed against the capstan 2, and at that time, a special jig is required.

Moreover, with the pair of upper and lower V-shaped crimping surfaces 20 of the crimping member 19 being engaged with the side surfaces of the pair of upper and lower discs 12 of the pinch roller shaft 10, the lower end 10a of the pinch roller shaft 10 is covered by the pinch roller arm 9. It is necessary to adjust the rotation stop position of the loading arm 7 by the stopper 25 so that the loading arm 7 is positioned substantially at the center, and this adjustment work in the azimuth direction B is very troublesome. Atsuta

Further, since the lower end 10a of the pinch roller shaft 10 is loosely fitted in the back hole 14 of the pinch roller arm 9, the pinch roller 4 easily tilts with respect to the capstan 2. On the other hand, when the pinch roller 4 is pressure-bonded to the capstan 2, the pair of upper and lower V-shaped pressure-bonding surfaces 20 of the pressure-bonding member 19 corrects the pinch roller shaft 10 in parallel with the capstan 2 in the azimuth direction B. Therefore, as shown by the solid line in FIGS. 7 and 8, for example, when the pinch roller 4 is pressed against the capstan 2 in the direction B ₁ of the azimuth direction B while being pressed from the direction of the arrow b. , Pinch roller 4
While being crimped to the capstan 2, by the pair of upper and lower V-shaped crimping surfaces 20 of the crimping member 19, the other direction of the azimuth direction B is reached to a position parallel to the capstan 2 shown by the one-dot chain line in FIGS. 7 and 8. It will be twisted by B ₂ . As a result, the eighth
As indicated by the alternate long and short dash line in the figure, the magnetic tape 3 pressed against the capstan 2 by the pinch roller 4 is unexpectedly twisted in the arrow B ₂ direction.

From the moment the magnetic tape 3 is crimped onto the capstan 2, the magnetic tape 3 is driven and driven by the capstan 2 in the direction of the arrow d. As described above, the magnetic tape 3 is twisted and crimped onto the capstan 2. Then, the magnetic tape 3 undulated in the direction of the arrow d ', and the magnetic tape 3 could not be normally run for a certain period of time. Particularly, in recent data recorders and the like, since the magnetic tape 3 used is very thin and easily twisted as described above due to the necessity of recording for a long time, the magnetic tape 3 is driven to run at an ultra-low speed. The running of the magnetic tape 3 is disturbed for a very long time after the running of the magnetic tape 3, and normal recording and / or reproduction cannot be performed unless a certain time is waited after the magnetic tape is pressed onto the capstan. There was a problem called.

An object of the present invention is to provide a pinch roller device which requires no complicated adjustment and can press the pinch roller to the capstan in a completely parallel state with high precision.

[Means for solving the problem]

In order to achieve the above object, the pinch roller device of the present invention comprises a pinch roller shaft having a lower end fixed to the pinch roller arm and a support shaft having a lower end fixed to the loading arm. While rotatably attached with play on the outer periphery of the spindle,
The pinch roller arm is pressed against the loading arm by the elastic force of a spring to hold the pinch roller in parallel with the capstan.

[Action]

In the pinch roller device configured as described above, the lower end of the pinch roller shaft is fixed to the pinch roller arm, but the pinch roller arm rotates with play against the support shaft fixed to the loading arm. Since it is freely attached, when the pinch roller is crimped to the capstan by the crimping arm, for example, the degree of freedom for correcting the parallelism of the pinch roller in the tilt direction with respect to the capstan has a degree of freedom of the pinch roller arm with respect to the spindle. Can be tolerated by play.

Moreover, since the pinch roller is pressed against the loading arm by the elastic force of the spring to hold the pinch roller parallel to the capstan, for example, the parallelism of the azimuth direction to the capstan is maintained by the spring. However, the pinch roller can be pressed against the capstan by the pressing arm.

Therefore, it is possible to press the pinch roller in a state of being perfectly parallel to the capstan, although no complicated adjustment is required.

〔Example〕

An embodiment of a pinch roller device in a recording / reproducing apparatus such as a cassette type data recorder or a VTR to which the present invention is applied will be described below with reference to FIGS. The fourth
The same reference numerals are given to the same structural parts as those of the conventional example shown in FIGS.

The lower end 10a of the pinch roller shaft 10 is press-fitted from above into a vertical through hole 27 provided in the horizontal pinch roller arm 9 and fixed vertically.

The lower end 8a of the support shaft 8 is vertically press-fitted into a through hole 28 vertically provided at the tip of the horizontal loading arm 7 from above to be fixed thereto. A sleeve 29 is rotatably inserted around the outer periphery of the support shaft 8 below the loading guide 13,
The sleeve 29 is placed on the loading arm 7 via the washer 30, and the upper portion of the sleeve 29 is pressed by the washer 31 and the compression coil spring 32 which support the loading guide 13 from below.

The other end of the pinch roller arm 9 is provided with a fool hole 33 having a diameter larger than the outer diameter of the sleeve 29.
Thus, the pinch roller arm 9 is rotatably attached to the outer periphery of the support shaft 8 with the play 34 corresponding to the diameter difference.

A retaining ring 35 is fixed to the upper end of the sleeve 29, a washer 36 is provided below the retaining ring, and a disc spring, which is a spring around the outer periphery of the sleeve 29, is provided below the washer 36.
When the disc spring 37 is fitted, the disc spring 37 presses the upper surface 38 of the outer peripheral portion of the fooling hole 33 of the loading arm 9 downward along the axial direction, and the lower surface of the outer peripheral portion of the fooling hole 33 of the loading arm 9 is pushed. 39 is pressed against a horizontal flange 40 that is integrally provided on the outer circumference of the lower end of the sleeve 29. Accordingly, the pinch roller arm 9 is held in parallel with the loading arm 7 by the disc spring 37, and the pinch roller 4 on the outer periphery of the pinch roller shaft 10 fixed vertically to the pinch roller arm 9 is held.
Is held parallel to the capstan 2.

 Next, the operation will be described.

Similar to the conventional example, the loading arm 7 is rotated in the direction of the arrow a to the position indicated by the solid line in FIG. 2, abutted against the stopper 25 and stopped, and then is rotated in the direction of the arrow b. A pair of upper and lower V-shaped crimping surfaces 20 of the crimping member 19
At the side of the pair of upper and lower discs 12 of the pinch roller shaft 10 with arrow b
In this direction, the pinch roller arm 9 is rotated about the support shaft 8 in the direction of arrow b, and the magnetic tape 3 is pressed against the side surface of the capstan 2 by the pinch roller 4.

According to this pinch roller device, although the lower end 10a of the pinch roller shaft 10 is fixed to the pinch roller arm 9, the pinch roller arm 9 has a play 34 with respect to the support shaft 8 fixed to the loading arm 7. It is mounted so that it can rotate freely. Therefore, when the pinch roller 4 is crimped to the capstan 2 by the crimping arm 5, the pinch roller arm with respect to the spindle 8 has a degree of freedom for correcting the parallelism of the pinch roller 4 with respect to the capstan 2 in the tilt direction A. It can be allowed in play 34 of 9.

On the other hand, the pinch roller arm 9 is pressed against the horizontally extending loading arm 7 by the elastic force of the disc spring, and the pinch roller arm is held horizontally so that the pinch roller 4 is held parallel to the capstan 2. ing. Therefore, in the state where the parallelism of the pinch roller 4 with respect to the capstan 2 in the azimuth direction B is held by the disc spring 37, the pinch roller 4 can be pressed against the capstan 2 by the pressing arm 5.

Therefore, no troublesome adjustment is required, and the pinch roller 4 can be pressed onto the capstan 2 in a completely parallel state in both the tilt direction A and the azimuth direction B with high precision. The pinch roller 4 is twisted while being pressed against the capstan 2
The magnetic tape 3 is twisted unexpectedly by the capstan 2
It is never crimped to. Therefore, the magnetic tape 3 can be correctly crimped in a state orthogonal to the capstan 2, and the magnetic tape 3 can be normally run immediately after the magnetic tape 3 is crimped. Normal recording and / or reproduction can be performed at the same time as the pressure bonding.

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

For example, in the above embodiment, the pinch roller arm 9 is pressed against the loading arm 7 by the disc spring 37, but the disc spring 37 can be replaced with a compression coil spring or other various springs. is there.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

No troublesome adjustment is required, and the pinch roller can be crimped to the capstan in a highly parallel state with high accuracy, so the magnetic tape crimped to the capstan can be twisted unexpectedly. Even if it is a data recorder etc. that runs the magnetic tape at ultra-low speed, the magnetic tape runs normally immediately after the magnetic tape is crimped to the capstan. be able to. Accordingly, normal recording and / or reproduction can be performed at the same time when the magnetic tape is pressed onto the capstan.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a side view of a partly cutaway main part, and FIG. 2 is a plan view of a partly cutaway part of the main part, FIG. 3 is a side view taken along the line III-III in FIG. FIG. 4 is a plan view of a conventional example, FIG. 5 is a side view taken along the line VV of FIG. 4, and FIG. 6 is a side view taken along the line VI-VI of FIG.
7 and 8 are a plan view and a side view for explaining the twisting of the tape during pressure bonding. In the reference numerals used in the drawings, 2 ... Capstan 3 ... Magnetic tape 4 ... Pinch roller 5 ... Crimping arm 7 ... Loading arm 8 ... Spindle 8a ... Spindle lower end 9 ... … Pinch roller arm 10 …… Pinch roller shaft 10a …… Lower end of the pinch roller shaft 19 …… Crimping member 33 …… Fool hole 34 …… Play 37 …… It is a disc spring.

Claims (1)

[Scope of utility model registration request] 1. A loading arm, a support shaft mounted on the loading arm, a pinch roller arm rotatably mounted on the outer periphery of the support shaft, and a pinch roller shaft mounted on the pinch roller arm. And a pinch roller rotatably attached to the outer circumference of the pinch roller shaft, a capstan, a magnetic tape, and a crimp arm having a pair of upper and lower crimping surfaces. In a pinch roller device that presses the magnetic tape onto the capstan by the pinch roller by laterally pressing the upper and lower ends of the pinch roller shaft, the lower end of the pinch roller shaft is fixed to the pinch roller arm. Then, the lower end of the support shaft is fixed to the loading arm, and the pinch roller arm is attached to the outside of the support shaft. It is characterized in that the pinch roller arm is rotatably attached in a state having a play around it, and the pinch roller arm is pressed against the loading arm by an elastic force of a spring to hold the pinch roller parallel to the capstan. Pinch roller device.