JP2592439B2 - Draft device and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a drafting device having a plurality of bolts extending between two side walls formed as sheet metal parts at right angles to the longitudinal axis of the drafting device.
Furthermore, the present invention relates to a method of manufacturing a draft device in which one bolt cooperates with a movable part of the draft device.

[0002]

2. Description of the Related Art A known drafting device has a plurality of bolts extending at right angles to its longitudinal axis. These bolts are needed for the mechanism between the lever and holder of the drafting device and its support. Furthermore, at least one bolt is provided on the load element. These bolts extend between the side wall of the lever and the support of the holder and the support of the load element and between the components of the mechanism for moving the holder. In spite of their differing functions, all these bolts have in common that they extend at right angles to the longitudinal axis of the drafting device between two side walls formed as sheet metal parts.

[0003] Conventionally, these bolts are mounted by means of a press fit, alternatively or in addition to by lateral coining, riveting or squeezing. However, it has been found that these mounting methods have limitations, especially when the sheet metal parts are heavily loaded.

Further, this known mounting method often involves
It has the disadvantage that some of the bolts project out of the side wall in the drafting device. When the drafting device is used, the material to be spun is caught or gathered at the protruding bolt ends. Such adhesion, which is further strengthened by sharp edges and sticky oils, is undesirable. Further, there is a risk that the worker may be injured by the protruding bolt when working with the draft device.

In a general method of attaching bolts to a drafting device, holes are provided in side walls of the drafting device facing each other, bolts are fitted into the holes, and the bolts are attached by stamping, riveting or squeezing. Can be

However, this method has a disadvantage that the position of the bolt cannot be corrected and changed when the bolt is fitted into the hole. For this reason, tolerances that occur when manufacturing individual parts with holes may cause the holder to be slanted when bolts are installed in the holes.

[0007]

SUMMARY OF THE INVENTION It is an object of the invention to improve a drafting device of the type mentioned at the outset so that the bolts do not protrude on the outer surface of the side wall of the drafting device, and to provide a bolt for mounting the bolt. It is an object of the present invention to provide a method of manufacturing a draft device in which the positional tolerance of the draft device is reduced and the inclination of the bolt is avoided.

[0008]

SUMMARY OF THE INVENTION In accordance with the present invention, it is an object of the present invention to provide a drafting device which includes a plurality of bolts extending perpendicular to the longitudinal axis of the drafting device between two side walls formed as sheet metal parts. This is achieved in a drafting device with at least one bolt which is welded against the side wall.

[0009] The method of manufacturing a draft device described above, wherein the bolt cooperates with a movable component of the draft device, wherein: a) the bolt having the movable component is provided between two side walls; Placed and held by the side wall by a pressurizing operation; b) the position of the bolt is checked by the movement of the moving part; c) welded when the bolt is exactly in place;
If the position is shifted, the position of the bolt is corrected again before welding, and the step b) is continuously performed.

[0010]

Since the bolts abut against and are welded to the two side walls formed as sheet metal parts of the drafting device, it is not necessary to make holes in the sheet metal parts in advance. A hole may be provided as a passage for an approach for welding at most. Furthermore, when welding, only short bolts that do not protrude from the side walls in the drafting device are required. Thus, the above-mentioned disadvantages of the known draft device are avoided.

By welding the bolts, the bolts can be securely fixed using simple parts.

Since the position and alignment of the bolts during welding can be varied within certain limits, position tolerances can be adjusted by the welding equipment.

Further, the strength (stability) of the draft device is significantly increased by welding the bolt.

The necessary contact points for welding are formed on the side wall as a sheet metal and the bolt. The assembly structure at the welding point of the bolt end face or the side wall formed as a sheet metal part improves the welding process. In order to avoid sparks from being scattered at the welding point during welding, the welding point can be surrounded by a bulge-shaped sheet metal molding.

The method according to the invention is particularly advantageous. A plurality of bolts are mounted on the drafting device, and these bolts cooperate to add the effects of their position tolerances, so that the draft force at the position of the drafting device or at the load element is measured, and the bolts are designed as intended. It is advantageous to compensate for manufacturing tolerances in the part by positioning in place.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a draft device according to the present invention will be described below in detail with reference to the drawings.

The draft device 10 shown in FIG. 1 has a lever 11, a holder 12, and a support 13 formed by sheet metal forming. As shown in FIG. 2, three load elements 14, 15, 16 are mounted as movable parts between the two side walls of a holder 12 having an inverted U-shaped cross section and having two side walls parallel to the plane of FIG. ing. Bolts 17, 18, 19, and 20 are mounted on both side walls of the support 13 and the holder 12, or on a mechanism existing inside the support 13.

FIGS. 2A and 2B show examples of different mounting structures for such a bolt, for example, bolt 20. FIG. The holder 12 is attached to the support 13 by a bolt 20 so as to be able to rotate (swing). Therefore, as shown in FIG. 2A, holes 21 and 22 are formed on both side walls of the support 13, and these holes 21 and 22 are formed.
The bolt 20 is inserted into 2. The bolts 20 slightly protrude from both side walls of the support 13 and are in contact with the inner surface of the side wall of the holder 12. At the contact surface, the bolt 20 is
To be welded. In order to prevent sparks from scattering during welding, an annular bulge can be provided on the inner surface of the side wall of the holder 12 around the contact surface (FIG. 2).
(B)).

FIG. 3 shows a load element 14, which has a bolt 23 which supports a guide 24 in a movable (rotatable) manner.

FIG. 4 is a cross-sectional view of the load element 14. In this figure, bolts 23 which are arranged between both side walls of the load element 14 and support the guide 24 are shown. Here, too, the bolt 23 is butt-welded to the side wall surface of the load element 14.

The bolts cooperating with such moving parts of the drafting device are welded in a manner according to the invention. For example, when the guide 24 is to be movably coupled to the load element 14 by a bolt 23, the bolt 23 is passed through a hole provided in the guide 24, and is positioned at a predetermined position with respect to both side walls between sheet metal parts for the load element. It is arranged and fixed to a sheet metal part by a pressing operation. Subsequently, the position of the bolt 23 is inspected. The pressure which the guide 24 has to exert is measured for this purpose. When the pressure corresponds to a predetermined value, the bolt is welded where it is fixed between the sheet metal parts. When the measured value does not match the predetermined value, the position of the bolt is corrected. This correction and inspection process is continued as an adjustment process until the bolt is put in the correct position, that is, until the measured pressure when the holder is moved matches the predetermined value.

Another method according to the invention makes it possible to first check the shape and alignment of the drafting device in a special device and subsequently fix the bolts by welding. In this method, the bolts 17 to 20 are supported 13
And is movably arranged between the two side walls of the holder 12, i.e. clamped, for example, between the sheet metal parts, in which the shape and alignment of the drafting device is adjusted. In this case, the positions of the bolts 17 to 20 with respect to the sheet metal parts can be easily changed. Only when the shape and the alignment of the drafting device correspond to predetermined values are the bolts fixed by welding. Also in this method, a predetermined parameter of the draft device can be calculated to secure a predetermined position of the bolt.

[Brief description of the drawings]

FIG. 1 is a side view of a draft device according to the present invention.

2A is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 2B is a cross-sectional view of another example in which a corresponding portion of FIG. 2A is enlarged.

FIG. 3 is a side view of a load element of the draft device.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Draft device 12 Holder 13 Support 14 Load element 17-20 Bolt 23 Bolt 24 Guide

Claims (5)

(57) [Claims] 1. A drafting device having a plurality of bolts (17-20, 23) extending perpendicular to the longitudinal axis of the drafting device (10) between two side walls formed as sheet metal parts. Bolts (17-20,
23) The drafting device, wherein the device is welded against the side wall. 2. The drafting device according to claim 1, wherein the welding portion on the end face or the side wall of the bolt (17-20, 23) has an assembly structure. 3. The drafting device according to claim 1, wherein the welding portion is surrounded by a bulging portion-shaped sheet metal forming portion. 4. The bolt (23) is a draft device (10).
2. The method of manufacturing a drafting device (10) according to claim 1, wherein the bolt (23) with the movable part (24) is located between two side walls. Placed and held by the side wall by a pressurized operation, b) the position of the bolt (23) is checked by the movement of the movable part (24), c) welding when the bolt (23) is exactly in place If the position is out of alignment, the position of the bolt (23) is corrected again before welding, and the step b) is continuously performed. 5. The method according to claim 4, wherein the load force is measured and adjusted to a target value by correcting the position of the bolt.