JPS60158938A - Manufacture of narrowing point for knitting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing transfer needles for knitting machines, and is used in the field of manufacturing and sales of knitting machines.

(Prior Art) A well-known transfer needle for a knitting machine is provided with section portions each having a different thickness for reasons of knitting technology, and a transfer section is formed between the head and the leg. have executives. The transfer section is composed of at least one leaf spring fixing groove and a housing groove formed on the side of the trunk, and in some cases, a sloped part, and transfers the stitches of the needles of the needle bed to another needle. It has the function of transferring to the needle on the floor (German Patent Publication No. 2847972).However, for example, the section with reduced thickness and the fixing groove for the leaf spring cannot be formed by any processing method other than cutting.
In order to manufacture transfer needles such as those described above, conventionally, a number of special operations were required, mostly involving machining. Such special cutting operations require deburring and polishing operations each time.

(Problem to be solved by the invention) Mass production of transfer nails with no quality defects places high demands on the special machinery and jigs and tools needed to perform the above-mentioned separate special operations. Not only that, but it also requires precision measurement and inspection equipment, which is indispensable for quality control. As a result,
The manufacturing cost is high and the manufacturing period is long (creating disadvantages).

Therefore, the object of the present invention is to be able to process the material by simply applying punching technology and stamping press technology, and to solve the problem of material flow that occurs during this work without having to perform any special work. It is an object of the present invention to provide a method for manufacturing transfer needles for knitting machines that can solve the problems. In particular, this method is intended to be suitable for making stockinette needles possible with complex multifunctional machine tools. Furthermore, the object is to manufacture transfer needles for knitting machines that can be formed by stamping press work and punching work.

(Means for Solving the Problems) The present invention comprises a head portion, a leg portion, and a stem between the two, and each of the stems has a fixing groove and a housing for at least one leaf spring. This is a method for manufacturing transfer needles for knitting machines in which grooves are arranged, and the trunk is formed by a combined and/or sequential punching process and stamping press process, in which the needle base is first formed. Material steel strip made of wood (36)
Punching processing and stamping press processing required for (37,3
9 to 44), and then, in the forming process in which the final shape (45) of the main body is finally determined, the material steel strip is punched out.

(Operations and Effects of the Invention) The advantage of the present invention is that the stockinette needle trunk can be manufactured by combining operations consisting of punching and stamping press steps, in addition to the special operations required for forming the hook and attaching the latch.
At this time, separate cutting processes such as deburring, polishing, and milling operations are not required.

Such advantages of the invention particularly involve first of all material extrusion. Therefore, work that affects the shape and dimensions of the needle or needle trunk is performed, and the original intended shape is finally completed by punching work, but at the same time, the deformation that occurred in the previous process is made ineffective, or Or it is the result of a manufacturing method that again eliminates the deformation.

Therefore, there can be arbitrary or uncontrollable material flow in each step.

(Example) Hereinafter, the content of the present invention will be explained in further detail based on the example shown in the accompanying drawings.

1 to 3 show a conventional transfer needle with a stem 11, a head or hook part 12 with a latch pivotably supported from the top to the bottom, and a receiving groove. 14, a transfer section 13 with an arched recess 15 and a fixing groove 16, and a leg 17. The grooves 14 and 16 and the recess 15 described above are formed on one side of the flank of the needle shaft. One end of a leaf spring 18 is fixed in the fixing groove 16, the other end is elastically supported in the accommodation groove 14, and the central part forms a curved part 19 so as to bridge the recessed part 15. There is. The leaf spring 18 is secured in the spring groove 16 by a shoulder 20 which is riveted and partially projects from the spring groove 16.

For reasons of knitting technology, the main trunk 11 is also often provided with a first section 21 of reduced thickness lying on the leg and a second section 22 of reduced thickness lying in the transfer section 13. . This type of transfer needle and its effects are already well known (German Patent Publication No. 2
No. 847972).

4 and 5 only show the transfer section 26, which is provided with the receiving groove 27 and the recess 28, of the main body 25 of the transfer needle according to the invention. The other functional parts of such a stockinette needle are as shown in FIGS. 1-3. Transfer section 26 manufactured by any method includes:
If a fixing groove is to be formed, the method according to the invention is as follows.

First, in a predetermined area where a fixing groove is to be provided, a hole-shaped space 31 is formed using a punching tool at a location indicated by a broken line in FIG. Next, a fixing groove 32 (FIGS. 6 and 7) is made using a stamping press tool. During this stamping press operation, the trunk material raised by the stamping stamp enters into the space 31 at the bottom of the groove and more or less partially fills it. As a result, more or less uncontrollable deformations occur in the space 31 due to the inflowing trunk material portion 33. This is particularly clear when comparing the shape of the initial space 31 shown by broken lines in FIGS. 6 and 7 with the shape of the space remaining after the stamping process. On the other hand, such a shape change is preferable in that it strengthens the bottom, which has been weakened as a result of forming the space, and widens the foothold for the leaf spring.

The space portion 31 may have any cross-sectional shape.

The size of the cross section is selected so that the space portion 31 can completely accommodate the extruded trunk material when marking the fixing groove 32. It is preferable that the total capacity of all the spaces 31, measured from the bottom of the groove to the back of the trunk, is larger than the total capacity of the fixing groove 32 to be formed.

This achieves, on the one hand, the formation of groove walls running perpendicular to the trunk abdomen at an acute angle when struck by the marking stamp, and, on the other hand, the ends of the space 31 where the extruded material is away from the groove bottom. This avoids the situation where the material protrudes from the surface again and requires an extra step to remove it. The number of space portions 31 is arbitrary, and in some cases, even one space portion may be provided. Preferably, a large number of space parts 31 are arranged along the fixing groove, and a shoulder part 20 for the leaf spring (FIG. 1) is formed between these space parts 31. Consideration should be given to leaving a multi-pass material section 34 (FIG. 6.7). Otherwise, all these spaces 31 preferably consist of holes or slots formed by drilling operations completely through the trunk. Of course, these may also consist of solid holes or grooves of appropriate depth formed by pressing. When the space portion is formed, a bulge may be formed in the abdomen of the needle shaft on the side surface not provided with the fixing groove, and there is a risk that an additional work step will be required to remove this bulge.

In the method of the present invention, by manufacturing the fixing groove 32, the entire needle trunk 25 can be formed almost by stamping press molding and stamping press molding. For this purpose, according to the invention, the eighth
Preferably, the method illustrated in the figure is applied. In this figure, the range processed in each punching or stamping press step is indicated by diagonal lines. Furthermore, it is assumed that each process from 1 to 7 can be carried out by one combined stamp handling/stamping press molding machine tool.

In a first step, from an elongated blank 36 consisting of an unhardened steel plate or copper strip, which is moved through the above-mentioned multifunctional machine tool in the direction of the arrow V, a punching tool first cuts out diagonal lines, as can be seen in FIG. 8. A die 37 is punched out leaving a steel plate fragment 38 in the shape shown in FIG. This steel plate piece 38 is made as large as or larger than that corresponding to the head of the completed stockinette needle shaft and the part connecting it to the transfer section.

In a subsequent second step, a stamp or press tool is used to reduce the thickness of the steel plate section 38 in a direction perpendicular to the drawing surface, resulting in a section 39 indicated by the dashed line. The above-mentioned stamping or pressing is performed at the location where the section with the reduced thickness shown in FIG. 1 is to be placed in the transfer needle after completion. As a result of the material deformation that occurs in this case, excess material flows out laterally into the part 37 punched out in the first step. This process is also clear in the fact that the shaded area 39 in FIG. 8 is wider than the area corresponding to the steel plate fragment 38 formed in the first step.

In the next third step, a section corresponding to section 21 (FIG. 1) whose thickness has been reduced is molded. This is accomplished, as in the second step, by means of a stamp or press tool, which in FIG. A range 40 is formed. The flowed-out trunk material begins to spread in all directions into the punched space 37. Steel plate fragment 3
8, sections 39 and 40 will be provided at predetermined locations where sections 21 and 22 (FIG. 1) should be considered.

In the fourth step, in the raw steel strip 36, a space portion 41 indicated by diagonal lines is located at the location where the plate spring fixing groove 16 or 32 (FIGS. 1 and 6) in the completed transfer needle trunk should be located. This corresponds to space 31 in Figure 4.5,
The material steel strip 36 is completely cut out, and the space portion 4
This is done using a stamping press or punching tool with a shape corresponding to the shape of 1.

In the fifth step, the fixing groove 43 and the housing groove 42 are formed using a suitable stamping press tool, and the grooves 42 and 43 correspond to the grooves 14 and 16 (FIG. 1), respectively. The material flowing out during the stamping process of the fixing groove 32 then enters the space 41 and at least partially fills it. This is clear from the fact that the cross section of the space portion 41 is reduced after the fifth step compared to the fourth step in FIG. 8. In another embodiment of the present invention, the raw steel strip 36 may be provided with a space portion corresponding to the space 41 at the location where the receiving groove 42 is to be located in the fourth step. The depth of the warming storage groove 42 is shallower than that of the fixing groove 43,
Normally this is not necessary as the width is narrow and therefore poses no particular problem for the stamping press operation. Excluding this, it is desirable that the cross-sectional shape of the receiving groove 42 is V-shaped, since this cooperates with the free end of the leaf spring.

In the next sixth step, a space 44 corresponding to the space 28 in FIG. 6 is formed using an appropriately shaped punching and stamping tool. The material fragments removed during this processing are indicated by diagonal lines. Due to the lateral material flow that occurs at this time, the area 39 expands slightly.

As described above, the copper strip 36 is provided with the reduced thickness sections 39, 40, the grooves 42, 43 and the spaces 44. This is sent to the next seventh step, where the area 45 indicated by hatching in FIG. 8 is perpendicular to the drawing surface in FIG.
A punching tool corresponding to the contour acts, and as a result, the entire shaded area 45 is punched out of the raw steel strip 36. At this time, on the one hand, the final shape of the trunk section to be punched out below the punching section 37 is determined, and on the other hand, in the punching operation of the 7th process, it is clear when compared with the 2nd to 6th process. As the outline of the steel plate portion 38 corresponds to the final trunk shape, the punched portion 37 is punched out until the sixth step.
The needle stem portions arranged in the shape assume their final shape. 7th
The formation carried out in steps 2.3 and 6 in particular covers sections 39, 40 and 44 which are subject to changes under the influence of material flow and which then result in non-adjustable widths. The term "width" herein refers to the dimension commonly referred to as the height of stockinette needles. Sections 39 and 40
Therefore, in the seventh step of the final process, the plate thickness is automatically reduced and sections 46, 47 of the preset height are created.
is molded, and the space portion 44 is formed in the seventh step, which is the final step.
The space portion 48 is transformed into a space portion 48 having the required dimensions in the process. Since the above-mentioned shape change, i.e. setting of the needle stem height, is carried out in the final step according to the invention in sections 46, 47 and 48, the material flow that occurs in steps 2.3 and 6 has great significance. Section 39.40
It is not necessary to take any special measures in steps 2.3 and 6 to control the material flow at and 44.

Following the seventh step - the needle shaft formed as described above and whose external contour matches the contour of the region 45 is usually further processed in a known manner, e.g. fitted with hooks and latches, and subjected to a further hardening treatment. be done. Finally, the leaf spring is inserted into the fixing groove 43, and the stamp (rivet stamp) is inserted into the fixing groove 43.
The leaf spring is fixed in the fixing groove by pressing it against the side wall of the fixing groove and forming a shoulder projecting laterally to the center of the groove as shown in FIGS. 1 to 3.

The invention is not restricted to the above; furthermore, this example can be implemented differently. The manufacturing steps illustrated in FIG. 8 can also be carried out in a different order, for example. This is particularly true for the sixth step, which can also be performed at another time. Some more steps,
For example, it is also possible to integrate the second and third steps into one step and change the number of manufacturing steps. Further, since the space portion only functions to accommodate the material extruded during molding of the fixing groove 32 or 42, the number, arrangement, shape, and size of the space portions 31 or 41 can be freely selected. however,
In order to obtain a controllable flow of material, it is important to provide a sufficiently large space section distributed along the length of the numerous fixing grooves. The cross section of the space portion is preferably smaller than the groove width, or preferably slightly larger. A space with a large cross-sectional area is also possible as long as the weakening of the groove wall caused by this does not pose a problem.

The present invention relates to all needles similar to those shown in Figure 9, which differ only in shape and spring system, and which differ in various types and other dimensions. Can be applied.

[Brief explanation of the drawing]

Fig. 1 is a side view of the transfer needle, Fig. 2 is a front view, Fig. 3 is a sectional view connecting ■-■ in Fig. 1, and Fig. 4 is a side view of the main body of the transfer sword according to the present invention. , Figure 5 is a sectional view connecting V-■ in Figure 4, and Figure 6 is a side view of the trunk of Figure 4, with the plate spring fixing groove formed. The later state, Figure 7 is a sectional view connecting ■-■ in Figure 6,
FIG. 8 illustrates each step of the method for manufacturing a transfer needle according to the present invention, and FIG. 9 is a diagram illustrating the seventh step in FIG. 8 regarding a transfer needle of a different shape and size. 11.25... Trunk part 12... Head or hook part 14.27.42... Accommodation groove 16.32.43... Fixing groove 17... Leg part 18... Leaf spring 31 .41.48...Space portion 36...Material 37...Mold 39...Fragment 40.45...Range Patent Applicant Haase & Kula Nis Agent Masatsugu SuzukiFig, 8° 1 '2 3 4 5 6 7

Claims (1)

[Claims] 1. The trunk is formed by a punching process and a stamping press process that are combined and/or sequentially performed. Punching processing and stamping press processing (37, 39, to 4)
4), and then, in the molding process in which the final shape (45) of the trunk is determined, one head and one leg are punched out of the copper strip material, as well as both of them. Method 2 of manufacturing a knitting wire transfer needle in which at least one fixing groove and a housing groove for each leaf spring are arranged between the needles 2. Before performing the stamping process selected on the material steel strip (36). The space part (
41) Claim 1 characterized in that
Method 3 described in Section 3: A punched portion (37) is formed in the raw steel strip (36) so as to surround a part of the head and the transfer section, and a section (37) whose thickness has been reduced by a stamping press process is formed inside the punched portion (37). Method 4 according to claim 2, characterized in that the plate spring fixing groove and the accommodation groove (42, 43) are formed by stamping press work. range 1
Method 5 according to at least one of Items 3 to 3: A space portion (41) is formed by drilling at least one hole at a predetermined location where a fixing groove (43) is to be placed in the material steel strip (36). 6. A method according to at least one of claims 2 to 4, characterized in that the copper material lies between the groove bottom and the trunk abdomen spaced apart from the fixing groove (43). Method 7 according to claim 5, characterized in that the volume of the space (41) in the region of the band (36) is greater than that corresponding to the volume of the fixing groove (43) to be formed. Multiple spaces (3
1) and each space between the material base for supporting the leaf spring (34
) Method 8 according to claim 5 or 6, characterized in that when stamping the section (39, 40) with reduced thickness, the material flowing into the perforation (37) is The method according to at least one of claims 3 to 7, characterized in that the removal is performed in a punching operation in the final molding process.