JPH0245549B2 - YOSETSUWAIYAYOSUPUURUNOWAIYAMAKIHAJIMETANBUNOKEISHIHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for locking a starting end of a wire to a spool for winding welding wire (hereinafter referred to as wire), particularly a spool for winding welding wire, which is abbreviated as a cage spool. The present invention relates to a method for locking a winding start end of a wire by which the wire can be locked easily and reliably to the spool.

A cage spool is, for example, spool elements a, b, c, etc. formed by bending a single metal wire (usually a steel wire) 1, as shown in Fig. 1 (plan) and Fig. 2 (front view). Arrange multiple pieces in a circular shape,
The radial rims of adjacent spool elements are joined together to form a spool, and it is inexpensive, lightweight, and has sufficient strength. Furthermore, it can be easily recovered as metal resources after use. Due to these advantages, it is increasingly being used as an alternative to plastic spools.

By the way, when winding wire around a car spool, the wire winding start end must be locked to the part corresponding to the winding drum, but if the wire winding start end is not completely locked, the wire cannot be wound. In some cases, when the amount of wire winding remaining becomes small during use, the wire winding start end tends to come off, and the winding wires may become entangled with each other due to springback, etc., resulting in increased wire withdrawal resistance. At the same time, the loose end of the wire may come into contact with the base material and cause a shoot.
Alternatively, there is a risk of causing problems such as contact with the operator. Therefore, it is necessary to securely lock the wire winding start end to the spool. On the other hand, from the viewpoint of winding properties of the wire, it is desired that the locking operation of the winding start end of the wire be performed as easily as possible.

However, since the cage spool is made of metal wire as mentioned above, the general-purpose means used for plastic spools (i.e., a hole for locking the wire winding start end in the spool winding body) is used. It is not possible to repurpose the method (such as drilling method, etc.) as it is, so we take into account the unique structure of the cage spool.
There is also an urgent need to develop a method for locking the end of the wire winding that can satisfy the above requirements.

The present invention has been made in view of these circumstances, and it is an object of the present invention to provide a method for locking a wire winding start end that can easily and reliably lock the wire winding start end to a car spool. That is.

The method of the present invention that achieves the above objectives is as follows:
When locking the winding start end of the welding wire to the welding wire spool, which is made by arranging a plurality of spool elements formed by bending a standard metal wire in a circular shape and joining them to each other, the winding start end of the welding wire is In forming a loop in the direction along the cast, and setting the entrance angle of the end point of the loop to the loop start point of the loop to be 90 degrees or less, and locking the winding start end of the welding wire to the spool, The end portion of the loop is brought into contact with the metal wire on the winding drum side, and the metal wire is pushed into the loop so that the loop area is reduced by the pressure of the metal wire, and the metal wire is pushed into the loop. The gist of this method is to lock the loop to the metal wire on the winding drum side by restoring the area of the loop.

The configuration and effects of the present invention will be explained below with reference to the drawings.

FIG. 3 is a schematic diagram showing the principle of a typical embodiment of the present invention, in which 1a is a metal wire constituting a portion corresponding to the winding drum of the car spool (hereinafter referred to as the winding drum wire), and W is the winding start end of the winding wire. section (hereinafter referred to as the winding start wire)
shows.

In securing the winding start wire W to the car spool, as a preparatory step, the winding start wire W is fixed at two points, point K and point P, along the direction along the cast, that is, the direction in which the diameter of the wire cast becomes smaller, as shown in the figure. to form a substantially triangular loop. When forming the loop, a gap of length L is left between the loop end point 2 and the loop start point 3, and an entrance angle α of the loop end point 2 with respect to the loop start point 3 is set.
Consideration is given to make it an acute angle, but as described later, L = 0
But it doesn't matter. As for the specific means for locking, first, the loop is advanced forward over the winding trunk wire 1a, and then the end side Wb of the loop is
In particular, it is arranged so that the vicinity of the loop end point 2 comes into contact with the winding trunk wire 1a. Then, the winding trunk wire material 1a, that is, the spool, is rotated in the direction of arrow A, or the loop is strongly pulled in the direction opposite to arrow A. Through this operation, the winding trunk wire 1a and the loop end point 2 receive pressure in the direction of pushing each other, and the winding trunk wire 1a bites into the gap like a wedge, so that the loop end
The Wb wire begins to bend in the direction of decreasing the loop area (in the direction of arrow B). Along with this bending, the gap length L gradually increases, and when it reaches the position shown by the dashed line, that is, the position where the gap length L becomes equal to the diameter d of the winding drum wire 1a, the gap is The body wire 1a slips through. At the same time, the bent wire at the loop end side Wb is released from the pressing force with the winding drum wire 1a, rotates in the direction of restoring the loop area, that is, in the direction of arrow C, and returns to the initial loop state. As a result, the winding drum wire is engaged and held within the loop as shown by the two-dot chain line circle 1b.

The winding start wire W is secured to the spool in the above manner, but as shown in the above embodiment, in the present invention, the entrance angle of the loop end point 2 to the loop start point 3 is set to 90 degrees or less. This is one of the conditions, and this makes it easy to bend the wire at the loop end side Wb until the winding drum wire passes through the gap, and also allows the wire once locked to easily bend at the end side Wb. It pushes back and prevents it from leaving. In other words, as shown in Fig. 4, when the wire entry angle is an obtuse angle (α ₁ ), the state shown by the chain line is because it has once passed through the perpendicular state due to the pressing with the winding drum wire (the state corresponding to Fig. 3). , and then it is necessary to press them together further, so a considerably large rotation angle is required before the winding drum wire enters the loop, and of course, an excessive force is required accordingly.

On the other hand, as shown by the thick broken line, if the wire entry angle α is 90° or less from the beginning, the rotation angle until the winding drum wire material enters the loop is small, and the winding start wire W is moved into the winding drum. Only a small amount of force is needed to lock the wire 1a.

On the other hand, considering the state in which the winding drum wire 1a is locked in the loop, if the wire entry angle is an obtuse angle (α ₁ ), it is impossible for the winding drum wire 1a to detach from the loop. The entry angle becomes
If the angle (α) is less than 90°, it becomes even more difficult to detach. In addition, when considering the workability of locking the winding start wire to the car spool, it is desirable that these operations be able to be performed automatically. Winding drum wire material 1 formed by rotating in the direction of arrow M
When the winding start wire W with the entry angle of 90° or less is placed on the circular locus of a, one of the winding body wires 1a bites into the loop end point 2 of the winding start wire W like a wedge. , the loop turns together with the winding drum wire 1a while remaining in the bitten state, and reaches a position where it is balanced with the back tension in the direction of arrow N (back tension caused by gripping a feed roller (not shown)), for example, the position indicated by the dashed-dotted line. At this stage, the winding drum wire 1a enters into the loop and is locked while reducing the loop area as described above. On the other hand, if the winding start wire W placed on the winding drum wire 1a has an obtuse angle, the winding drum wire 1a will not dig in toward the loop end point 2, as shown in FIG. As shown by the two-dot chain line, the wire W at the start of winding is thrown up, so no matter how much the spool is rotated, the loop just jumps up at the fixed value, and no matter how long it takes, the loop of the winding trunk wire 1a will not continue. No biting occurs and automatic locking cannot be performed. Therefore, it is desirable that the line angle be 90° or less.

In addition, in the present invention, the length L of the gap between the loop end point 2 and the loop start point 3 must be at least smaller than the diameter d of the drum wire 1a to such an extent that the drum wire 1a does not freely slip through the gap. In particular, in the above embodiment, the length is set so that d>L>0, but as shown in the embodiment described later (see FIG. 9), L=0 may be used. Further, in the above, a method was adopted in which the winding start end of the wire was fixed and the winding trunk wire material 1a of the spool was pressed against it, but conversely, the winding trunk wire material 1a of the spool was fixed and the wire winding start end with a loop formed was fixed. You may try to find a way to attract them.

Next, a modification of the loop shape of the wire winding start end according to the present invention will be described.

7 to 9 are schematic diagrams showing other embodiments.
In the figure, the wire winding start end W is curved into a substantially circular shape to form a loop, the entrance angle α of the loop end point 2 to the loop start point 3 is formed at an acute angle, and the loop end point 2 and the loop start A gap of length L (d>L) is provided between points 3. In addition, in FIG. 8, a loop is formed by combining a straight portion 4 and a curved portion 5 at the end of the wire winding start, the wire entry angle α is 90°, and a gap similar to the example in FIG. 3 is provided. There is. In FIG. 9, a loop having three bending points is formed at the end of the wire winding start, the entrance angle α is an acute angle, and the loop end point 2 and the loop start point 3 are in contact with each other. According to the present invention, the wire winding start end can be locked in the same manner as described above by forming the loop shape shown in the above embodiment or a loop shape that is a suitable combination thereof at the wire winding start end. It was made in a similar manner.

In addition, when taking out the winding start end of the wire locked as described above from the spool, use pliers or the like to set the gap length L between the loop end point loop and the start point to be larger than the diameter d of the winding trunk wire 1a. However, it is sufficient to allow the winding drum wire to slip through the gap.

The present invention is roughly constructed as described above, and the wire winding start end can be easily locked to the car spool, and a reliable locking state can be obtained. In particular, even when the amount of remaining winding of the wire becomes small, the winding start end of the wire does not come off naturally from the spool, and accidents such as shorts and injuries can be prevented. Furthermore, since the operation for starting wire winding has become easier, it has also become possible to automate this operation.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the car spool, Fig. 2 is a side view of the same, Figs. It is a schematic diagram which shows the modification of the wire winding start end part based on this invention. 1, 1a... Winding trunk wire rod, 2... Loop end point,
3...Loop start point, W...wire, Wb...end side.

Claims (1)

[Claims] 1. When locking the winding start end of the welding wire to the welding wire spool, which is made by arranging a plurality of spool elements formed by bending one metal wire in a circular shape and joining them to each other, the winding start end A loop is formed in the direction along the cast, and the entrance angle between the end point of the loop and the start point of the loop is set to 90° or less, and when the winding start end of the welding wire is locked to the spool. The end part of the loop is brought into contact with the metal wire on the winding drum side, and the metal wire is pushed into the loop so that the loop area is reduced by the pressure of the metal wire, and the metal wire is pushed into the loop. A method for locking a wire winding start end of a welding wire spool, characterized in that the loop is locked to a metal wire on the winding drum side by restoring the area of the loop after being pushed in.