JPS5993512A - Journal mechanism for rotary member - Google Patents

Abstract

PURPOSE:To improve stopping performance in the direction of thrust by forming a recessed step at the circumference of axial hole at the side contacting with a stopper chip while engaging a stopper chip having larger diameter than that of said step section with the shaft at the inside of said step section and contacting with the edge of said step section to journal a rotary member. CONSTITUTION:A recess 11b is formed around an axial hole 11a and planted integrally with circumferential rib 11c while rib 11b is planted similarly around an axial hole 11a at the other side face. A gear 11 is fixed such that the rib 11d will contact with the substrate 13. A resilient stopper 14 is engaged with an engage groove 12a provided at the leading edge of shaft 12 with same or slightly lower position than the rib 11c and to contact the leading edge with the rib 11c. The gear 11 is pressed in the direction of rib 11c to slide the rib 11d against the substrate 13. With such structure, the rotary member can be stopped reliably in the thrust direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a shaft support mechanism in which a rotating body such as a gear is pivotally supported around a shaft so as to be locked in the thrust direction.

1\' Viewing technology and its problems Conventionally, in order to pivot a rotating body such as a gear on a shaft, the rotating body was threaded around the shaft and a holding piece such as an E-ring or a split poly slider was engaged with the lever. However, as shown in Figure 1, it is impossible for the presser piece (3) to closely engage the surface of the rotating body (1) with respect to the shaft (2) due to accuracy, so the presser piece Piece (
A gap a is created between the surface of the rotating body (1) and the rotating body (11), so that the rotating body (11) moves in the thrust direction with respect to the shaft (2), and the shaft hole (1a) of the rotating body (1) Since there is some gap between the rotating body (1) and the shaft (2), the rotating body (1)
), and if the rotating body (11) is a gear, the meshing with the other four MLs may become unstable, and if it is an idler gear that comes into contact with and separates from other gears, the meshing may become impossible. This drawback was noticeable in the case of particularly thin-walled gears.

Purpose of the Invention In view of the above-mentioned points, the present invention provides a rotating body in which the holding piece is engaged with the shaft while in contact with the rotating body, so that the rotating body can be firmly pressed in the thrust direction with respect to the shaft. This provides a pivot mechanism for the

Summary of the Invention In a shaft-supporting mechanism for a rotating body in which a rotating body is inserted into a shaft and held down and supported by a presser piece that is connected to the shaft, the periphery of the shaft hole on at least the side of the rotating body that is pressed by the presser piece. A concave step is formed in the shaft, and a presser piece having a diameter larger than the concave step is engaged with the shaft on the inside of the concave step, and the presser piece is brought into contact with the edge of the concave step. The rotating body is firmly pressed in the thrust direction with respect to the shaft, and even if there is a gap between the shaft hole of the rotating body and the shaft, the rotating body will swing. iT against Komaen and Suke! R-cross rotation is possible.

EXAMPLE Below, an example of the shaft support mechanism for a rotating body of the present invention is shown in FIGS. 2 and 3! This will be explained with reference to l-.

In Figure 2, αυ is a gear as a rotating body made of nylon (
It is made of synthetic resin material such as product name), and four parts (llb) are formed around the shaft hole (lla) of one side of this gear (Ill), and the circumference is A circumferential rib (IIC) is integrally provided to protrude, and a circumferential rib (11d) is integrally provided for the circumference 1 of the shaft hole (lla) on the other surface 111j.

(121 is the shaft installed on the board (13+), and the gear αD is connected to the other side +1+i 1tllll c1') ')
The shaft hole (lla
). At the tip of this axis σ2 is a gear αD.
An engagement groove (12a) is formed in the circumferential direction at a position that is equal to or corresponds to the height of the rib (IIC) on one side of the Combine one thread of an elastic valve piece (141) such as a split polyslider with a diameter larger than the circumferential rib (IIC) of the presser piece a (a).
The gear (11) is brought into contact with the circumferential rib (IIc) of the inner peripheral surface of the gear (111), and the gear (11) is pressed in the thrust direction of the shaft (121), and the rib (lid) on the other side is brought into sliding contact with the substrate (1, HC). .

In this way, the gear αD is held in the thrust direction and the rib (lid) is brought into sliding contact with the substrate 131, so that it can rotate in a perfect circle and orthogonally to jiA1+ (121) without swinging.In this example, Forms a rib (IIC) in the recess (1lb) of the gear 011 and presses the presser piece 04.
Although the rib (IIC) is not provided, the presser piece (141) may be brought into contact with the periphery of the recess (ub).

It has been found that by configuring the shaft support mechanism in this way, the high frequency flutter component of the gear is improved compared to the gear with the conventional shaft support mechanism, and the runout due to the difference in posture hardly changes.

That is, as a result of an experiment using this gear in a tape recorder, the standard tape on which the reference frequency signal was recorded was 1. Karr
When reproduced at the tape speed of y'Jei3, the ItMS value of wow and flutter, which was 1.5 to 2.0% conventionally, was reduced to 0.9 to 1.0% in the present invention.

Figure 3 shows another real h11 (for example, multiple rotating bodies,
In this example, the pawl is coaxially supported.

The holding piece (141 is approximately equal to the inner diameter of the fourth part (llb) of the gear Qll, or the size between the fourth part (llb) and the rib (llc) is formed so that the diameter is approximately equal but there is a larger difference. to form.

Then, this gear 01) is inserted into the shaft (ta), and the holding piece α is engaged with the engagement groove (12a) of the gear 11 (12).
When it comes into contact with the rib (IIC) of II), the presser piece (14)
is positioned in the recess (llb) of gear (1, 11), and one side of gear (Ill) is approximately the same plane throughout.Therefore, similarly, one side of this gear (11J) is When the other formed gear QS is inserted and stacked on the coaxial α2, the rib (11d') on the other side comes into sliding contact with the surface of the gear aυ or the holding piece α4 x!E■, a u
and aS can be placed close to each other at extremely small intervals. Note that the other gear On also has one side attached to the shaft (12) in the same way as gear (II).
It is pressed by the presser piece (141) engaged with 1.

When a plurality of gears are coaxially supported in this manner, a large number of gears can be supported within a predetermined shaft length.

In each of the above embodiments, a gear is used as the rotating body, but the present invention can also be applied to a rotating wheel such as a pulley, and the material is not limited to a resin material.

Effects of the Invention As described above, according to the present invention, when the rotating body is supported on the axis of the rotating body, the rotating body is directly pressed in the child last direction by the holding piece, so that the rotating body is not only moved in the thrust direction with respect to the anchor 1 but also rotated. Even if there is a gap between the shaft hole of the body and the shaft, the first rotation due to the gap will be prevented, and the rotating body will rotate in a perfect circle and at right angles to the shaft, resulting in a wow 7 rattle. It has been significantly improved, and can be reliably linked with other rotating bodies without generating any stall rotation noise.
Furthermore, a high fh degree is not required in manufacturing, and mass production is possible, and the present invention is particularly effective when applied to thin-walled rotating bodies.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional rotating body shaft support mechanism, FIG. 2 is a cross-sectional view of an example of the rotary body shaft support mechanism according to the present invention, and FIG. 3 is a cross-sectional view of the same on the other side. +ai+ in the figure is a gear as a rotating body, (llb)
is the concave part, (IIC) (lid) is the lip, the circle is the axis, ([3
) is the substrate, and α is the holding piece. Figure 1: Figure 1:32: Song: 11"n1

Claims (1)

[Claims] In a shaft support mechanism for a rotating body in which a rotating body is inserted into a shaft and held and supported by a holding piece that is engaged with the shaft, there are four stages around the shaft hole of at least the side of the rotating body that is held down by the holding piece. A presser piece having a diameter larger than the recessed step is engaged with the shaft inside the recessed step, and the presser piece is brought into contact with an edge of the four-step portion to rotate the rotating body. A pivoting mechanism for a rotating body whose main feature is that it is pivoted while holding down.