JPH0447779Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an apparatus for testing a pinch roller for running a tape such as a magnetic tape by compressing it between a capstan and a capstan.

BACKGROUND ART A typical prior art is shown in FIG.
A capstan 2 is mounted on the base 1 so as to be rotationally driven around its axis. A pinch roller 3 that comes into pressure contact with the capstan 2 is rotatably attached to a holder 4. Holder 4
is urged upward in FIG. 4 by spring 5.
The holder 4 is provided so as to be movable back and forth along a guide shaft 6 erected on the base 1 . A bolt 7 is screwed onto the top of the guide shaft 6, and the end of the bolt 7 allows the holder 4 to be adjusted and displaced downward.
The holder 4 is roughly curved in a U-shape,
The bolt 9 that loosely inserts the upper arm portion 8 is connected to the lower arm portion 10.
to be screwed together. A magnetic tape is interposed between the capstan 2 and the pinch roller 3.

In order to stabilize the running of the tape by adjusting the bolts 7 and 9, the relative angle between the capstan 2 and the pinch roller 3, the vertical height position of the pinch roller 3, and the position of the pinch roller 3 relative to the capstan 2 are adjusted. The pressure contact force applied to the tape is tested, and the optimum value or allowable range of these values for tape running is evaluated. By rotating the bolt 9, the upper arm part 8 and the lower arm part 10 of the holder 4 move closer to each other and move away from each other, and the axis of rotation of the pinch roller 3 is tilted. Further, by rotating the bolt 7, the holder 4, and therefore the pinch roller 3, are displaced up and down in FIG.

Problems to be Solved by the Invention In this prior art, the relative angle between the capstan 2 and the pinch roller 3, the height position of the pinch roller 3, the pressing force of the pinch roller 3 against the capstan 2, etc. are quantitatively determined. cannot be evaluated objectively. Furthermore, the holder 4 is made of a material such as a relatively thin metal plate, and therefore bends.
Less reliable.

An object of the present invention is to provide a pinch roller testing device that can quantitatively evaluate the structure related to the pinch roller and has improved reliability.

Means for Solving the Problems The present invention is a testing device for a pinch roller that is rotatably held by a holder and pressed against a capstan, and includes a pinch roller that is provided approximately parallel to the axis of the pinch roller and has a sharp tip. a support shaft that has a base end and a spherical head and supports the holder movably along and around its axis; a pivot bearing that supports the base end of the support shaft; a micrometer head having a spindle; first pressure contact means for bringing the spherical surface of the head of the support shaft into contact with the spindle of the micrometer head; The pinch roller testing device is characterized in that it includes a second pressing means for displacing the holder around the axis of the support shaft while varying the pressing force.

Effect According to the present invention, the holder that rotatably holds the pinch roller and presses it against the capstan is displaced along the axis of the support shaft by the support shaft provided approximately parallel to the axis of the pinch roller. It is supported so that it can be oscillated around its axis. This support shaft has a sharp base end and a spherical head, and the base end is supported by a pivot bearing provided on a base or the like, and the head has a sharp base end and a spherical head. is constantly urged by the first pressure contact means to abut against the spindle of the micrometer head.

Therefore, the spherical surface of the head of the support shaft is pressed by the micrometer head against the pressing force of the first pressing means, thereby adjusting the inclination of the axial line of the pinch roller. The amount of inclination can be quantitatively evaluated.

Further, by displacing the holder along the axis of the support shaft, the height position of the pinch roller can be adjusted and the height position can be quantitatively evaluated.

Furthermore, the pinch roller is pressed against the capstan by the holder being oscillatedly displaced by a second pressing means, and the second pressing means applies a pressing force of the pinch roller to the capstan. It is variable, so the pressure contact force can be quantitatively evaluated.

With the above configuration, tests on pinch rollers can be performed with high reproducibility and reliability.
The test can be carried out conveniently.

Embodiment FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a simplified partial sectional view of the embodiment, and FIG. 3 is a partially exploded perspective view of the embodiment. be. Referring to these drawings, a capstan 14 is mounted on the base 13 so as to be rotatable about its axis, and the capstan 14 includes the following:
A motor 15 is attached. The motor 15 and thus the capstan 14 are rotated in the direction of the arrow 16. The magnetic tape 17 has a guide pin 18
The film is guided by the magnetic head 19, passes from the capstan 14 through the guide pin 23, and is wound up by the take-up reel 24. A pinch roller 25 is pressed against the capstan 14 .
The pinch roller 25 is made of a material such as rubber,
It is supported by a mounting shaft 27 via a bearing 26. This mounting shaft 27 is connected to the pair of upper and lower arm portions 2 of the holder 28.
It is fixed at 9,30. The holder 28 is attached to the arm portion 2
9 and 30, and this base 31
includes an engaging portion 3 extending on the opposite side from the arm portions 29, 30.
2 is fixed. One end of a cable 34 such as a flexible thread is connected to the end 33 of the engaging portion 32 . A weight 35 is attached to the other end of the cable 34. The cable 34 is wound around a pulley 36 that is rotatably attached to the base 13 and has a horizontal rotation axis. The cable 34, the weight 35, and the pulley 36 constitute a second pressure contact means. A pivot ball bearing 37 is fixed to the base 13 below the holder 28 . A conical base end 39 of a support shaft 38 is attached to the pivot ball bearing 37 . The support shaft 38 has a shaft portion 40 connected to the base end portion 39 and a head portion 4.
1. Base end portion 39, shaft portion 40, and head portion 41
have axes on a common straight line. Shaft portion 40
is the insertion hole 4 formed in the base 31 of the holder 28.
2 into the holder 28.
is movable up and down in FIGS. 2 and 3 along the axis of the support shaft 38. The spring 43 interposed between the base 13 and the holder 28
8 upwardly in FIGS. 2 and 3. A recess 44 is formed in the middle of the shaft portion 40, and an E-shaped retaining ring 45 is fitted into this recess 44. A spring receiver 46 abuts above the E-shaped retaining ring 45 . A spring 49 is interposed between the spring receiver 46 and the plate-shaped support member 48. Spring 49 urges spring receiver 46 and thus support shaft 38 downward in FIGS. 2 and 3. Shaft portion 40 of support shaft 38
is gently inserted through the insertion hole 47 formed in the support member 48. This support member 48 is fixed to the base 13 by three legs 50. A clearance gauge 51a may be interposed between the lower end surface of the E-shaped retaining ring 45 and the upper end surface of the base 31 of the holder 28. Thereby, the vertical position of the holder 28 and therefore the pinch roller 25 can be adjusted quantitatively.

The head 41 of the support shaft 38 has a spherical surface 51 centered on the axis of the support shaft 38 and a flat end surface 52 parallel to the axis of the support shaft 38 . The axis of the support shaft 38 and the axis of the attachment shaft 27 are substantially parallel.

Spindle 5 in contact with spherical surface 51 of head 41
3,54, a micrometer head 55,
56 are provided. This micrometer head 5
5 and 56 are orthogonal to each other within a common plane, and the intersection of the axes of these micrometer heads 55 and 56 is very close to the axis of the support shaft 38. The micrometer head 55 is inserted through the mounting hole 58 of the mounting member 57. Mounting member 5
The mounting hole 58 of No. 7 is formed by protrusions 59 and 60. A bolt 61 that is loosely inserted through one protrusion 59 is threaded into the other protrusion 60 . By threading the bolts 61 in this manner, the micrometer head 55 can be fixed to the mounting member 57. The attachment member 57 is fixed to the base 13. Another micrometer head 5
6 is similarly fixed to the base 13 by a mounting member 62.

The spherical surface 51 of the head 41 of the support shaft 38 is connected to the spindles 53, 54 of the micrometer heads 55, 56.
A pressure contact means 63, which is a first pressure contact means, is provided so as to be in contact with the first pressure contact means. This pressure contact means 63 includes a rod-shaped body 64 extending linearly, a protrusion 65 inserted through the rod-shaped body 64, a nut 67 screwed into an external thread 66 formed at the end of the rod-shaped body 64, and a nut 67 screwed into the rod-shaped body 64. 6
4 includes a guide member 68 displaceably supported along its axis and a spring 69. Guide member 68
is a guide hole 70 through which the rod-shaped body 64 is inserted and guided.
has. The guide member 68 is fixed to the base 13. A coiled spring 69 is inserted into the rod-shaped body 64, and a nut 73 is screwed into an external thread 72 formed at the end of the rod-shaped body 64 via a spring receiver 71. Thus the spring 69
urges the rod-shaped body 64 to the right in FIG. The protruding piece 65 has a flat plate shape and comes into contact with the flat end surface 50 of the head 41 . In this way, the spherical surface 51 of the head 41 is moved by the action of the spring 69 to the micrometer head 55,
56 spindles 53 and 54 in a resilient manner at all times.

To adjust the inclination of the axis of the pinch roller 25, the pair of micrometer heads 55 and 56 are operated, thereby inclining the axis of the support shaft 38.
In this way, the axis of the pinch roller 25 can be varied and adjusted. The height position of the pinch roller 25 in the axial direction can be adjusted by interposing the clearance gauge 51a between the E-type retaining ring 45 and the holder 28 as described above. Further, the pressing force with which the pinch roller 25 presses against the capstan 14 can be adjusted by the weight of the weight 35. That is, the weight 35 applies a clockwise rotational force to the holder 28 around the axis of the support shaft 38 in the clockwise direction shown in FIG. , are pressed against the capstan 14. The mounting shaft 27 of the pinch roller 25 projects upward for a relatively long time, and the inclination of the mounting shaft 27 can be measured with high precision using a three-dimensional measuring device or the like. In addition, the pivot ball bearing 37 allows the base end 3 of the support shaft 38 to
Therefore, the feed amount of the spindles 53, 54 of the micrometer heads 55, 56 directly corresponds to the inclination of the support shaft 38, and the feed amount of the micrometer heads 55, 56 can be read. Accordingly, the inclination of the support shaft 38, etc. can be easily converted, and the reproducibility is extremely excellent and reliability is improved.

The present invention can be widely implemented not only in connection with a magnetic tape, but also in connection with a pinch roller that presses against a capstan.

Instead of adjusting the force with which the pinch roller 25 is pressed against the capstan 4 using the weight 35, the force with which the pinch roller 25 is pressed against the capstan 4 can be adjusted using a spring or the like. You can.

Effects As described above, according to the present invention, it is possible to quantitatively evaluate various adjustable optimum values or allowable range values regarding the pinch roller, and
High reproducibility and improved reliability.

[Brief explanation of drawings]

FIG. 1 is a plan view of one embodiment of the present invention, FIG. 2 is a simplified partial sectional view of the embodiment shown in FIG. 1, and FIG. 3 is a plan view of the embodiment shown in FIGS. An exploded perspective view of a portion of the embodiment, FIG. 4 is a cross-sectional view of the prior art. 13... Base, 14... Capstan, 25...
... Pinch roller, 27 ... Mounting shaft, 28 ... Holder, 34 ... Cable, 35 ... Weight, 37 ... Pivot ball bearing, 38 ... Support shaft, 43, 49, 6
9... Spring, 48... Support member, 51... Feeler gauge, 55, 56... Micrometer head,
63... Pressing means, 64... Rod-shaped body, 65... Protruding piece, 68... Guide member.

Claims (1)

[Claims for Utility Model Registration] A testing device for a pinch roller that is rotatably held by a holder and pressed against a capstan, the pinch roller being provided approximately parallel to the axis of the pinch roller and having a sharp base end and a a support shaft having a spherical head and displaceably supporting the holder along and around the axis; a pivot bearing supporting a proximal end of the support shaft; and a spindle. a meter head; a first press-contact means for bringing the spherical surface of the head of the support shaft into contact with the spindle of the micrometer head; and a first press-contact means provided in association with the holder and configured to vary the press-contact force of the pinch roller to the capstan. and second pressing means for displacing the holder around the axis of the support shaft.