JPH0411239Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a mechanism for fixing the shaft of a so-called guide roller in, for example, a magnetic tape recording/reproducing device.

BACKGROUND ART FIG. 4 is a sectional view of a so-called guide shaft portion of a prior art magnetic tape recording/reproducing device. A cylindrical guide member 2 rotatably inserted coaxially with a round bar-shaped shaft 1 is not allowed to move unnecessarily in the axial direction of the shaft 1 by an upper support member 3 and a lower support member 4 fixed to the shaft 1. Supported so as not to be displaced.

A concave groove 5 is formed on one imaginary diameter line in the upper support member 3, and is fitted with the tip of a screwdriver (not shown) as described later.
The shaft 1 and the lower support member 4 are rotated about their axes. Further, the lower support member 4 is provided with an external thread 6, and, for example, with respect to the housing 7 of a magnetic tape recording/reproducing device, an internal thread 9 is provided on the support member 8, which is fixed with a vertical axis.
is screwed together.

The support member 8 is, for example, cylindrical, and its inner circumferential surface 8a has an internally threaded portion 9 from the lower support member 4 side, and an insertion hole 10 having a smaller diameter than the internally threaded portion 9 and into which the shaft 1 is inserted. . Further, the support member 8 is formed with a mounting hole 11 extending radially outward from the insertion hole 10 and having an internal thread. An external thread is formed in this mounting hole 11, and a threaded member 13 having a fitting recess 12 having a hexagonal cross section perpendicular to the axis, for example, is screwed therein.

In the above-described configuration, so-called height adjustment of the guide member 2 in the arrow A1 and A2 directions will be described. Fit the tip of the hexagonal wrench 14 into the fitting recess 12 of the screw member 13, rotate the hexagonal wrench 14 around the axis 15, and remove the tip 1 of the screw member 13.
6 should not come into contact with shaft 1. Next, as described above, the upper support member 3, shaft 1 and lower support member 4 are angularly displaced using a screwdriver (not shown) to move the guide member 2 in the direction of arrow A1 or arrow A2 as necessary. The height of the guide member 2 is adjusted by displacing it.

In this way, when the guide member 2 reaches the desired position, the angular displacement movement of the upper support member 3 is stopped. Next, the tip of the hexagonal wrench 14 is fitted into the fitting recess 12 of the screw member 13 again, and the hexagonal wrench 14 is rotated around the axis 15. This rotational operation causes the screw member 13 to have its tip 16 aligned with the shaft 1.
is pressed so that the shaft 1 is fixed so as not to undergo unnecessary angular displacement.

Problems to be Solved by the Invention In the prior art fixing mechanism for the shaft 1 as described above, the screw member 13 extending perpendicularly to the axis of the support member 8 must be screwed in or out using the hexagonal wrench 14. Of course, such a guide member 2
There was a problem that the work efficiency in height adjustment was low. Further, it is necessary to attach the screw member 13 to the support member 8 in a direction perpendicular to its axis, and therefore there is a limit to how short the height d of the support member 8 can be. There was a problem in that it was difficult to miniaturize.

Therefore, an object of the present invention is to provide a fixing mechanism that solves the above-mentioned problems, greatly improves work efficiency in terms of fixing operations, and has a simplified configuration.

Means for Solving the Problems The present invention has an insertion member and an insertion hole into which the insertion member is slidably inserted, and a hole on the outer peripheral surface whose diameter gradually increases along the insertion direction of the insertion member. The fixing mechanism is characterized in that it includes a support member having a first tapered surface formed thereon, and a pressing member having a second tapered surface formed on its outer circumferential surface that can come into contact with and press the first tapered surface.

Operation: The sliding member is inserted into the insertion hole of the support member and stopped at a predetermined position. Next, the second tapered surface of the pressing member is brought into contact with the first tapered surface of the support member to press it. This pressing operation causes the support member to
The portion including the tapered surface can deform radially inward and press the sliding member to fix it.

Embodiment FIG. 2 is a perspective view of a portion of a magnetic tape recording/reproducing apparatus 20 according to an embodiment of the present invention. A magnetic tape 22 wound on a supply reel 21 has its running direction changed by vertical poles 23 and 24, and slides against a full width erase head 26 via a back tension post 25.

The magnetic tape 22 whose signals have been erased by the full-width erasing head 26 is transferred to the impedance roller 2.
7. It is wound around the rotating cylinder 30 via the vertical pole 28 and the inclined pole 29. Rotating cylinder 3
For example, a video signal or the like is recorded on the magnetic tape 22 by the magnetic head 31 fixed at zero.

The magnetic tape 22 on which signals have been recorded slides on an impedance roller 34 via an inclined pole 32 and a vertical pole 33. Next, sound erase head 3
5 erases the audio signal, and the audio control head 36 records the audio signal and control signal. The magnetic tape 22 on which signals have been recorded in this manner passes through a capstan 37 and a pinch roller 38, and then passes through a vertical pole 39.
The running direction of the take-up reel 4 is changed by
It is wound up by 0.

In the magnetic tape recording/reproducing apparatus 20 having such a configuration, recording of signals onto the magnetic tape 22 is performed by a so-called helical recording method. Therefore, the inclined poles 29 and 32 are provided so that the magnetic tape 22 can be smoothly wound around the rotating cylinder 30, which is attached with an axis that is not perpendicular to the running direction of the magnetic tape 22. The height of the vertical poles 28 and 33 that guide the tape to the inclined poles 29 and 32 must be adjusted and fixed after adjustment.

FIG. 1 is a sectional view showing a configuration related to the vertical pole 28 shown in FIG. 2, and FIG. 3 is an exploded perspective view of the configuration of FIG. 1. Referring to FIGS. 1 and 3, a cylindrical guide member 42 is provided, through which a shaft 41 in the form of a round bar, for example, which is an insertion member constituting the vertical pole 28, is inserted. The guide member 42 is provided coaxially with the shaft 41 and is rotatable around the shaft 41.

Further, along the axial direction of the shaft 41, the guide member 42
Upper support member 43 and lower support member 4 before and after
4, the shaft 41 is inserted into each insertion hole 43a, 44a.
is inserted and fixed.

On the side of the upper support member 43 opposite to the guide member 42,
A groove 45 is provided on one imaginary diameter line. Further, the lower support member 44 is provided with an outer thread 46, which is screwed into the inner thread 49 of a support member 48 which is attached to the housing 47 of the magnetic tape recording/reproducing device 20 with its axis perpendicular to the lower support member 44. The support member 48 has an inner thread 49 from the lower support member 44 side, and a shaft 41 that has a smaller diameter than the inner peripheral surface on which the inner thread 49 is carved.
An insertion hole 50 through which the is inserted is formed. In the insertion hole 50, the shaft 41 is slidable in the axial direction thereof and is formed in close contact with the shaft 41 so as not to wobble.

The support member 48 includes, in this order, a cylindrical portion 51, a step portion 52, a first tapered portion 53 whose outer peripheral surface has a gradually increasing radius of curvature, and a cylindrical portion 54 from the lower support member 44 side. A concave groove 55 is formed in the cylindrical portion 54 over the entire circumference in the circumferential direction, and an insertion hole 50 is formed in the cylindrical portion 54 .
At a position corresponding to the groove 55 on the inner circumferential surface 50a of
Again, grooves 56 are formed all around the circumference.

On the other hand, a fitting portion 57 is formed in the housing 47 into which the support member 48 is fitted from below in FIG. Support member 48 fitted into this fitting part 57
When the cylindrical portion 51 of is projected upward in FIG.
A locking protrusion 58 to which the stepped portion 52 is locked is formed on the housing 47 so as to surround the cylindrical member 51 .

A pressing member 59 is attached to the housing 47 . The pressing member 59 has a cylindrical portion 61 from one side in the axial direction and a second portion whose outer peripheral surface has a radius of curvature that gradually decreases.
It consists of a truncated conical portion 63 having a tapered surface 62 and a threaded portion 64 having an external thread. Also, the fitting part 6
0, into which the cylindrical part 61 and the truncated conical part 63 of the pressing member 59 are fitted from above in FIG.
is formed. Support member 48 and pressing member 59 are separated by an edge 66 of housing 47 . Here, the shaft 41, the support member 48, and the pressing member 59 constitute the fixing mechanism of this embodiment.

In the above configuration, the height adjustment operation of the guide member 42 will be explained. Referring to FIG. 2, use a screwdriver (not shown), for example, to adjust the height D1 (see FIG. 1) of the vertical pole 28 that guides the magnetic tape 22 to the inclined pole 29 to a predetermined value. The tip fits into the groove 45 of the upper support member 43, and the upper support member 43 is rotated around its axis. By this rotation operation, the upper support member 4
3 and the shaft 41 fixed to the lower support member 4
4 rotates. The lower support member 44 is the support member 4
8, the guide member 42 can be displaced in the direction of the arrow B1 or B2 along the axial direction of the shaft 41 by such rotational operation. In this way, the guide member 42 is positioned at a predetermined height D1.

Next, the tip of the screwdriver 68 is fitted into the fitting recess 67 formed in the cylindrical part 61 of the pressing member 59, and the screwdriver 68 is rotated around the axis. Pressing member 59
Turn the screwdriver 6 so that it is displaced in the direction of arrow B2.
8, the second tapered surface 62 comes into contact with and presses the first tapered surface 53. Therefore, a radially inward force acts on the portion of the support member 48 that includes the second tapered surface 62, as indicated by arrow B3. Therefore, this portion of the support member 48 is elastically deformed inward in the radial direction, and the insertion hole 5
The inner circumferential surface 50a of the shaft 41 can press and fix the shaft 41. In this way, the shaft 41 could be fixed so that it would not undergo angular displacement around its axis.

As described above, according to this embodiment, the operation for fixing the shaft 41 is performed by rotating the pressing member 59, which has an axis parallel to the shaft 41, around the axis extending in the vertical direction in FIG. do it. Therefore, the height adjustment work of the guide member 42 can be easily performed, and work efficiency can be significantly improved. Further, since there is no need to provide the screw member 13 as in the prior art described with reference to FIG. 4, the length D2 of the support member 48 in the axial direction can be shortened as much as possible. Therefore, the magnetic tape recording and reproducing apparatus shown in the second figure, which includes such a guide member 42, etc., can be made smaller and lighter.

Furthermore, the support member 48 is
The thickness in the radial direction is D2. Therefore, the support member 48 can be easily elastically deformed by the force in the direction of arrow D3 as described above.

In the above embodiment, the magnetic tape recording/reproducing device 2
Although described in relation to 0, the invention can be widely implemented in connection with configurations in which positional adjustments need to be made and then fixed.

Also, only one of the grooves 55 and 56 of the support member 48 in the above-described embodiment may be formed, or they may not be formed.

Effects According to the present invention as described above, the second tapered surface of the pressing member is brought into contact with the first tapered surface of the support member inserted into the insertion hole, and the first tapered surface is pressed. Therefore, the insertion member was elastically deformed by the force from the second tapered surface of the pressing member, and the inner peripheral surface of the insertion hole pressed the insertion member, thereby fixing the insertion member. Further, this fixing operation can be performed by angularly displacing the pressing member around an axis parallel to the axis of the insertion member. Therefore, such a fixing operation could be easily performed and the configuration could be simplified.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a magnetic tape recording/reproducing apparatus 2 including the configuration shown in FIG.
FIG. 3 is an exploded perspective view of the configuration shown in FIG. 1, and FIG. 4 is a cross-sectional view of the prior art. 28, 33... Vertical pole, 41... Axis, 42
... Guide member, 48 ... Support member, 50 ... Insertion hole, 50a ... Inner peripheral surface, 53 ... First tapered surface,
59... Pressing member, 62... Second tapered surface, 63
...The truncated cone.

Claims (1)

[Claims for Utility Model Registration] It has an insertion member and an insertion hole into which the insertion member is slidably inserted, and a first tapered surface whose diameter gradually increases along the insertion direction of the insertion member is formed on the outer peripheral surface. A fixing mechanism comprising: a supporting member having a cylindrical shape; and a pressing member having a second tapered surface formed on an outer circumferential surface thereof to press the first tapered surface in contact with the first tapered surface.