JPS60201162A - Follower for high speed cam - Google Patents

Abstract

PURPOSE:To prevent abrasion or the generation of a noise of a cam follower by connecting a comparatively soft ring-shaped member to the outer periphery of a comparatively hard ring-shaped member on the outer periphery of the bearing of a follower for a high-speed cam. CONSTITUTION:A cam follower has a hard ring-shaped member 1 formed by a nylon base synthetic resin containing molybdenum disulfide, which is connected to the outer periphery of a bearing by press fitting two steel bearings 2 having flange portions fitted to the inner peripheral side concave portions of the hard ring-shaped member 1 extending from both sides in the axial direction P thereof to the whole periphery of the outer end edge to a hole portion of the hard ring- shaped member 1. On the other hand, a soft ring-shaped member 3 having a small thickness and formed by polyurethane or the like is connected to the outer periphery of the hard ring-shaped member to form a cam follower.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a follower for a high speed cam, such as that used, for example, in the air jet control pulp section for weft delivery in an air jet loom as shown in FIG.

In Fig. 1, (a) is the air injection control pulp body, and (b) is the drive valve tip (c) of the pulp body (a).
It is a lever for pushing and pulling, and its upper end is l.
It is pivotally connected to the pulp body (a) marked O, and its middle part is constantly in contact with the drive valve tip (C) marked dtl by a spring or the like, and its free lower end is connected to the rotary valve 111.
The cam follower (f) that follows the drive cam (e) that rotates together with i (d) is rotatable around the axis (g) KII
X is attached. According to the above configuration, the rotation i1i
[1] Along with the rotation of (d), the cam (e) also rotates in the direction of the arrow (x), and the curved cam follower (f) rotates in the direction of the cam (e).
) while rotating itself following the cam surface of the arrow <y>
The pulp body (a) is pushed and pulled in the direction of the arrow (z) via the driving customer (c) and ID lever (b), and the valve body (,) is driven. Air is spouted out intermittently.

By the way, in such an air jet room, the drive rotating shaft (d) and the cam (
The rotational speed of e) is extremely high, and especially in today's world where air jet looms have become much faster, their rotational speed reaches as high as Jθθ~7.50 rpm. Under such severe usage conditions, the contact surface of the cam follower (f) marked 11'' with the cam (e) is extremely worn, and the cam is damaged due to the impact caused by the high-speed rotation of the cam (e). Various problems have occurred, including cracks and chips in the follower (f) and extremely loud noise.

However, these problems can be solved by the conventional tank 1 shown in Figure 2.
The second cam follower (f), that is, the inner steel ring (f8) that rotatably slides on the shaft (g) of the lever (b).
This phenomenon is particularly noticeable when a ring member (f2) made of a hard synthetic resin such as nylon resin is used on the outer periphery of the ring. With such a conventional structure, regular lubrication is necessary, and in particular, the inner steel 1
Severe wear occurs on both the inner circumferential surface of the ring (f) and the outer circumferential surface of the outer hard synthetic resin annular body (f2), and the hard synthetic resin annular body (f2) undergoes wear and cracks. Currently, they are prone to cracking and chipping, and must be replaced within a relatively short period of time.

Therefore, in place of the above-mentioned conventional structure, the present inventor has developed a steel bearing (f,) of 11'' type, as shown in FIG. ), or one in which a ring-shaped body (f6) made of hard synthetic resin such as nylon resin is temporarily installed around the outer circumference of a relatively small steel bearing (f5) as shown in Figure 3 (
Using a model that does not require lubrication, such as the second improved type (hereinafter referred to as the second improved type), we conducted extensive research on its durability and the level of noise generated. Even with the improved version, some degree of wear on the outer circumference of the bearing (f3) is unavoidable, and in particular, very loud noise is generated, which also leads to an increase in the weight of the device. Even with the second improved type of the latter, a certain amount of wear and noise generation at the outer peripheral part of the outer hard synthetic resin annular body (f6) cannot be avoided, and in particular, cracks and noise generation of the hard synthetic resin annular body (f6) cannot be avoided. It has been found that the cutting has a disadvantage in that the peripheral edges tend to chip.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to reduce wear and noise generation even when used for a cam driven at a very high speed.
It is also an object of the present invention to provide a follower for a high-speed cam that is less prone to cracking or chipping and can be made lighter and heavier as a whole.

In order to achieve the above object, the high-speed cam follower according to the present invention has a feature that a relatively hard annular body around the outer periphery of the bearing is connected to a relatively soft annular body. There is.

The above-mentioned characteristic structure exhibits the following nine functions and effects.

That is, the present invention has been achieved by breaking away from the conventional wisdom that the cam following surface of a follower for a high-speed cam must be as hard as possible to prevent wear, cracking, and chipping. The outermost periphery of the 7-olower, which is the anti-cam tracking surface, is made of a soft annular body, so even if it receives a large impact from the high-speed rotation of the cam, it is soft enough to effectively absorb the impact. As a result, the noise generated is extremely small, and there are no cracks or chips.Also, even though the outermost annular body is soft, it is surprisingly softer than conventional hard ones. 4Jli is extremely resistant to wear! It was necessary. In addition, the impact received from the cam is alleviated by the soft annular body at the outermost periphery, so
This also reduces wear on the inner circumference of the bearing.

In addition, in this fiEJI, instead of directly connecting a different soft annular body to the outer periphery of the bearing,
A rigid annular body is interposed between the two, which has the following significance. That is, it has been experimentally found that the soft annular body that is the 1θ cam follower does not exhibit sufficient wear resistance unless its wall thickness is small to a certain extent. For example, while the bearing can be made small in order to reduce the overall weight, the thickness of the soft annular body can be made small, and its wear resistance can be made sufficient.

As described above, according to the present invention, it has been possible to obtain a follower that is extremely durable, generates little noise, and is lightweight as a whole even when used in a cam driven at high speed.

Below is tree jJ? A specific embodiment of the fifth light will be explained based on the drawings (FIGS. 5 to 7).

As shown in FIGS. 5 and 6, a convex portion is formed around the entire circumference of both end edges of the outer peripheral surface and the intermediate portion thereof using, for example, nylon-based synthetic resin containing molybdenum disulfide, and , with respect to the hole of the hard annular body (1) formed by molding so as to have a concave portion along the entire circumference of both end edges of the inner circumferential surface, from both sides in the axial (P) direction, Two steel bearings (2) having a large flange portion around the circumference that fits into the inner circumferential recess of the hard annular body fl+.

(2) By fitting the full pressure inlet, the bearing +
21, +2], and on the other hand, the outer periphery of the hard annular body +1) is coated with, for example, polyurethane, etc., thereby forming the hard annular body mentioned in @. A high-speed cam follower is constructed by consecutively arranging a soft annular body (3) having a thickness smaller than t1). In the figure, (4) is a hole into which the support shaft (not shown) of this follower is inserted. In addition, as is clear from the figure, for example,
On the contact surface between the hard annular body i11 and the bearing (2), and on the joint surface between the hard annular body +I) and the soft annular body (3), roughness in the lll[lI (P) direction is formed. Therefore, prevention of misalignment and misalignment between them can be effectively achieved.

FIG. 7 shows another embodiment, in which one bearing (2) is completely press-fitted into the hole of the hard annular body (1).

Note that the method of connecting the bearing (2) and the hard annular body, and the hard annular body tl) and the soft annular body (3) is not limited to press-fitting or molding as described in 111, but may also be by adhesion. There is no difference even if other means such as

[Brief explanation of the drawing]

FIG. 1 shows an overall schematic side view showing an example of the use of a cam follower, and FIG. 2 is a front view showing a conventional cam follower. 8 and 4 are front views showing cam followers as comparative examples. 5 to 7 show an embodiment of the high-speed cam follower according to the present invention, FIG. 5 is a front view, FIG. 6 is a partially cutaway side view, and FIG. 7 is an example of another embodiment. FIG. 3 is a partially cutaway side view. (1)...Hard annular body, (2)...Bearing, (3)...Soft annular body. Agent Patent Attorney Osamu Kitamura

Claims (1)

[Claims] ■ A follower for a cam rotating at high speed,
A relatively hard annular body fl) around the outer periphery of the bearing (2)
A 7-olower for a high-speed cam, characterized in that a relatively soft annular body (3) is successively arranged around the outer periphery of the lowerer. ■ The bearing (2) is a 1θ hard annular body fl)
The high-speed cam follower according to claim 0, which is press-fitted into the high-speed cam. (2) The high-speed cam follower tool according to claim 0, wherein the bearings (2) are two bearings press-fitted from both sides in the axial direction into the hard annular body t1). (i) The soft annular body (3) is the hard annular body tl)
A follower for a high-speed cam according to any one of claims 0 to 2, which is provided by molding on the cam. ■ The outer circumferential surface of the hard annular body tl+ and the inner circumferential surface of the soft annular body (3) are formed with unevenness that engages with each other to prevent positional displacement. A follower for a high-speed cam according to any of item (■).