JPS60234121A - Manufacture of plastic retainer for needles - Google Patents

Abstract

PURPOSE:To have smooth and sure welding of a column to a side plate by forming a needle-shaped boss and a shallow dint to receive it at the top surface of the column and the inner side-face of the side plate, and fixing them together by ultrasonic deposition welding upon engagement of the two with each other. CONSTITUTION:A column-shaped boss 5 is formed at the top face 1b of each stay 1a of a retainer body 1, and fitted in a recess 6 in side plate 2. Needle- shaped bosses 7 with reduced tip diameter are formed around the boss 5 on the top face 1b of each stay. Around the recess 6 at the inner side-face 2a of the side plate 2, a shallow dint 8 is bored in order to accommodate the needle- shaped boss 7 on the retainer body 1. The boss 5 is fitted in the recess 6 and the needle-shaped boss 7 is set in said shallow dint 8, and then the two members are welded fast by ultrasonic deposition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method of manufacturing a plastic needle holder.

For some time now, needle retainers for needle bearings (A
) can be formed integrally by pressing a short steel tube as shown in Fig. 1, or by pressing a steel plate to form a needle holding part (B) and then forming it into a cylindrical shape. It is formed by bending and welding both ends.

However, in the case of the former type of cage, which is integrally formed by pressing a short tube, the dimensional accuracy of the needle holding part (B) is relatively low, and the outer periphery of the holding part (B) is The remaining. This requires a finishing process to remove burrs, and many problems remain in terms of needle transferability, productivity, and processing accuracy.

In addition, even with the latter welded cage, a cleaning process is required in addition to the welding process to remove metal dust, etc. that has adhered to the needle holding part (B) during welding, and there are various problems similar to the former. left behind.

On the other hand, in an effort to solve the above-mentioned problems with conventional steel needle holders, the needle holder was molded from a plastic material with excellent heat resistance and abrasion resistance, and was assembled into the holder. By creating a structure that can store and support the needle during installation, it is possible to simplify the assembly process of the needle bearing, improve the precision of the needle holding part, prevent noise, reduce weight, and significantly reduce manufacturing costs. A plastic needle retainer has been developed (
JP-A No. 53-17853, Utility Model Application No. 47-22329, etc.).

By the way, conventional plastic needle holders have recesses and protrusions for fitting on the two members that make up the holder.
It is assembled by gluing or welding both the interspace and protrusion contact surfaces.

However, conventional needle retainers of this type are constructed in such a way that the contact surfaces of the fitted concave and protruding parts are directly glued or welded. Problems such as an increase in the number of defective products and a decrease in quality due to leakage outward from the surface are unavoidable, and this problem becomes even more difficult as the cage becomes smaller.

The present invention aims to solve the above-mentioned problems in plastic needle cages, and it is possible to smoothly and reliably weld the joint surfaces of two members constituting the cage, and also to make it possible to weld the joint surfaces of two members constituting the cage, and to use melted resin. The object of the present invention is to provide a method for manufacturing a plastic needle holder that eliminates the elution of .

The present invention provides a columnar body (l
Between a) and (F) is the needle holding part (3), (3).
In addition, the needle contact surface (3a) of the needle holding portion (3) is a concave curved surface along the outer surface of the needle (4), and the upper end surface of the columnar body (la) is (11
)) has a plastic cage body (1) formed with a protrusion (5) or four parts (6);
A plastic flanged side plate (2) formed with a four part (6) or a protrusion (6) that fits into the protrusion (5) or four part (6) of 1) at a position opposite to the protrusion (5) or four part (6); are assembled by inserting the needle (4) into the needle holding part (3) and fitting the protrusion (5) into the four parts (6),
In the method for manufacturing a plastic needle holder, the joint portion between the upper end surface (1b) of the column (1a) and the inner surface (2a) of the side plate (2) is fixed and integrated. The diameter of the tip is reduced either around the protrusion (5) or the fourth part (6) on the upper end surface of the body (1b) or around the fourth part (6) or the protrusion (5) on the inner surface of the side plate (2a). A needle-like protrusion (7) is formed on the other side, and a shallow recess (8) having a shape that receives the needle-like protrusion (7) and whose diameter decreases toward the bottom is formed, and the protrusion (5) and When fitting with the fourth part (6), insert the needle-like protrusion (7) into the shallow recess (8) so that the outer peripheral surface of its tip comes into contact with the inner peripheral surface of the deep part of the shallow recess (8). The basic structure of the invention is to melt and fix the needle-like protrusion (7) and the shallow recess (8) by sonic welding.

Hereinafter, the details will be explained based on the embodiments of the present invention shown in FIGS. 2 to 13. The needle holder is composed of a holder main body 1 and a side plate 2 shaped like a brim.

The cage main body 1 is formed by integrally molding a so-called engineer plastic, such as hard nylon or polyacetate, which has excellent heat resistance, corrosion resistance, and wear resistance. As shown in FIG. 8, a plurality of needle holding portions 3 are formed between each support column 1a, la, which is formed by cutting out the outer circumferential wall of a cylindrical body in a regular direction with a constant width and interval.

As shown in FIGS. 2 and 7, the outer peripheral surface of the needle holding section 3, that is, the contact surface 3a with the needle 4, is finished as a concave curved surface along the outer peripheral surface of the needle 4 to be held, and when inserted from above. The needle 4 thus obtained is housed and supported in the holding portion 3 in an aligned manner. 5 is a cylindrical (or conical) protrusion formed on the upper end surface 1b of each support column 1a of the cage main body l, and a flange-shaped IIIjl described later is attached to the protrusion 5.
The four parts of the plate 2 will be fitted together.

4 and 5, as well as FIGS. 9 and 10 are a plan view and a sectional view of the brim-like side plate 2, in which the main body 1 is formed by molding of engineering plastic similarly to the cage main body 1. It is formed into a ring shape with approximately the same inner and outer diameters. Further, reference numeral 6 denotes four circular (or inverted conical) portions formed on the inner surface of the side plate 2, each of which is provided at a position facing the protrusion 5 formed on the upper end surface 1b of the column of the main body 1. , 6th
As shown in the figure, by fitting the protrusion 5 of the main body 1 into the recess 6 of the side plate 2, the two can be assembled with a predetermined positional relationship regulated.

In the above embodiment, the protrusion 5 is formed on the upper end surface 1b of the column of the cage main body 1, and the recess 6 is formed on the inner surface 2a of the side plate 2, but the formation of the protrusion 5 and the recess 6 is Of course, the positions may be reversed.

As shown in the partially enlarged view of FIG. 11, a plurality of protrusions (3 to 12
．． 1) needle-like protrusions 7 are formed.

As shown in the enlarged sectional view of FIG. 13, the needle-like protrusion 7 is formed into a pointed shape with a reduced diameter at the tip.

On the other hand, around the four parts 6 of the inner surface 2a of the side plate 2, there are 12
As shown in the partially enlarged view of the figure, a shallow recess 8 for receiving the needle-like protrusion 7 is provided.

As shown in the enlarged sectional view of FIG. 13, the shallow recessed portion 8 is formed into a shape whose diameter gradually decreases toward the bottom, that is, an inverted conical shape, and when the cage main body l and the brim-shaped side plate 2 are assembled, , when the protrusion 5 formed on the upper end surface 1b of the column of the cage main body 1 and the four parts 6 formed on the inner surface 2a of the brim-like side plate 2 are fitted together, the needle-like protrusion 7 is located in the shallow recess. The formation positions of both 7 and 8 are determined so that they fall within 8.

In this embodiment, the upper end surface 1 of the support column of the cage main body l
1) The needle-like protrusion 7 is formed on the top and the shallow recess 8 is formed on the inner surface 2a of the side plate 2, but the shallow recess 8 is formed on the upper end surface lb of the column and Needless to say, the needle-like projections 7 may be provided on the side surface 2a.

Next, a method for assembling the plastic needle holder according to the present invention will be explained.

First, the needles 4 are vertically inserted into each needle holding part 3 of the holder body 1 from above. Next, attach the side plate 2 to the post 1
The main body l and the side plate 2 are assembled by fitting the protrusion 5 into the four parts 6.

In this case, by fitting the protrusion 5 into each recess 6,
The mutual assembly of the holder main body 1 and the side plate 2 is regulated in position very precisely, and the centering of the needle holder and each needle 4.4 is automatically performed. Furthermore, by fitting the protrusion 5 into the recess 6, each needle-like protrusion 7 formed around the protrusion 5 also enters into each shallow recess 8 formed around the recess 6, and the protrusion The tip of the body 7 is brought into contact with the bottom of the shallow recess 8. In this state, a small distance is maintained between the upper end surface 1b of the column and the inner side surface 2a of the side plate in order to perform ultrasonic welding.

When the assembly of the cage main body 1 and the side plates 2 is completed, the joints between the upper end surfaces 1b of the respective columns and the inner side surfaces 2a of the side plates are fixed by ultrasonic welding. That is, using ultrasonic energy,
By causing the outer circumferential surface of the tip of the needle-like protrusion 7 on the upper end surface 1b of each support column to move in contact with the inner circumferential surface of the deep part of the shallow recess 8 on the inner surface 2a of the side plate, the resin at the contact portion is melted by the thermal energy. As shown in FIG. 13, the cage main body 1 and the side plate 2 are tightly fixed.

In the present invention, by providing the needle-shaped protrusion 7 and the recess 8, when the cage main body 1 and the side plate 2 are ultrasonically welded, excess melted resin C is prevented from flowing into the recess 8. As a result, the welding of the joining surfaces during ultrasonic welding can be performed more smoothly and reliably, and a clean welded surface with no melting of the molten resin can be obtained.

Further, in the present invention, since the energy density applied to the welded portion during ultrasonic welding is increased, welding strength is improved and an extremely smooth bonded surface can be obtained.

Further, in each of the above embodiments, the needle holding part 3 is formed into a straight shape to hold the cylindrical needle 4, but the needle holding part 3 and its needle contact surface 3a are formed into a tapered shape. It is also possible to use a truncated conical needle 4 by forming a truncated conical needle 4. As described above, the present invention forms a protrusion 5 on either one of the main body 1 and the side plate 2, and a four part 6 on the other. The recess 6 and the protrusion 5
The two are assembled by fitting them together. As a result, positioning when assembling the main body 1 and the side plate 2 becomes easy, and the needle holder and needle 4 can be automatically aligned when assembling the holder.
The strength of the assembly of the side plate 2 is also significantly improved.

Further, a plurality of needle-like projections 7 are formed on either one of the joint surface 1b on the side of the main body l and the joint surface 2a on the side plate 2, and a shallow part 8 for receiving the needle-like projections 7 is formed on the other. , protrusion 7
is inserted into the shallow mold part 8, the outer circumferential surface of its tip is brought into contact with the inner peripheral surface of the deep part of the shallow mold part 8, and both are melted and fixed by ultrasonic welding, so that the resin melted during ultrasonic welding is There is no leakage from the joint surface to the outside, which reduces the number of defective products and greatly improves the quality of the cage.In addition, the energy density of the welded part during ultrasonic welding increases significantly, and the strength of the fusion bond between the two is significantly increased. There is no chance of the two coming off during use.

As mentioned above, the present invention has excellent practical utility.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a conventional steel needle holder. FIG. 2 is a plan view of the holder main body constituting the needle holder of the present invention, FIG. 3 is a front view thereof, FIG. 4 is a plan view of the brim-shaped side plate, and FIG. A-A cross-sectional view, No. 6
The figure is a partial cross-sectional view showing the fixed portion of the cage body 1 and the side plate 2. FIG. 7 is a plan view of another cage main body, FIG. 8 is a front view thereof, FIG. 9 is a plan view of a brim-shaped side plate, and FIG.
It is a sectional view cut along the line AA in the figure. 11 is a partially enlarged perspective view showing the upper end of the columnar body of the cage main body, and FIG. 12 is a partially enlarged sectional view of the side plate 2. FIG. FIG. 13 is a partially enlarged sectional view of the joint. 1 Cage main body 1a Support column lb Upper end surface of the column 2 Flange-shaped side plate 2a Side plate inner surface 3 Needle holding portion 3a Needle contact surface 4 Needle 5 Projection 6 Recess 7 Needle-like projection 8 Shallow groove Patent applicant Date Representative of Asia Seimitsu Kogyo Co., Ltd. 1) - Male

Claims (1)

[Claims] Vertical notches having an appropriate width are provided at regular intervals on the peripheral wall of the cylindrical body, and the columnar bodies (Ia) and (l) formed by the notches are formed.
a) between the needle holding parts (3), (3)..., and the needle contact surface (3a) of the needle holding parts (3)... is formed into a recess along the outer surface of the needle (4). a plastic cage body (1) having a curved surface and having a protrusion (5) or four parts (6) formed on the second end surface (1b) of the column (la); A plastic flanged side plate (2) formed with a four part (6) or a protrusion (5) that fits into the protrusion (5) or four part (6) of 1) at a position opposite to the protrusion (5) or four part (6); are assembled by inserting the needle (4) into the needle holding part (3) and fitting the protrusion (5) into the recess (6), and the upper end surface (lb) of the columnar body (1a) and The inner surface (2a) of the side plate (2)
), in which the plastic needle holder is fixedly integrated with the upper end face (lb) of the column, around the protrusion (5) or the fourth part (6), and inside the side plate. A needle-like protrusion (7) with a reduced diameter tip is attached to either the recess (6) or the protrusion (5) of the side surface (2a).
In addition, a shallow recess (8) is formed on the other side to receive the needle-like protrusion (7) and whose diameter is reduced toward the bottom, so that when the protrusion (5) and the fourth part (6) are fitted, Insert the needle-like protrusion (7) into the shallow recess (8) and insert the outer peripheral surface of its tip into the shallow recess (8).
8) A method for manufacturing a plastic needle holder, characterized in that the needle-like protrusion (7) and the shallow recess (8) are melted and fixed by ultrasonic welding by contacting the inner inner surface of the plastic needle holder.