JPH02299148A - Automatic size checking method for filament coil - Google Patents

Abstract

PURPOSE:To automatically select filament coils with stable quality by providing a semicircular groove storing a coil section on a jig and a step section with the allowable limit height adjacently to the groove, and providing a rotary gauge at the position with the allowable limit height on it. CONSTITUTION:The coil section 1a of a filament coil 1 conveyed by a parts feeder 2 is stored in a semicircular groove 3a provided on a jig 3, and the leg section 1b or the coil 1 is positioned by a step section 3b with the allowable limit height via the fine vibration of the jig 3 inclined to the parts feeder 2 side. When the leg section 1b is not in the floating state or the leg floating height is within the preset range in the floating state, a rotary gauge 4 is not brought into contact with the leg section 1b, thus the filament 1 passes the rotary gauge 4 and is stored in a box 7 through a chute 8. When the leg section 1b is floated, the coil 1 is brought into contact with the rotary gauge 4 and hit down from the jig 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for automatically inspecting the dimensions of a filament coil, particularly the molding condition of its legs.

BACKGROUND OF THE INVENTION Filament coils for light bulbs and the like are often used that have a coil section and two legs extending from both ends of the coil section in opposite directions and parallel to the coil axis.

Conventionally, a filament coil having such a shape has been obtained by the following method. That is, first, a tungsten wire is wound around a core wire using a coil winding machine to form a coil portion, and the coil portion is cut to a predetermined length to form both legs continuous to the coil portion. Next, the filament coil thus obtained is molded in a heating furnace or by an electric heating method to obtain a filament coil 1 as shown in FIGS. 3(A) and 3(B). In FIGS. 3(A) and 3(B), 1a indicates the coil portion of the filament coil 1, and 1b indicates the same leg portion (respectively).

Finally, the molded filament coils 1 are inspected for quality, such as appearance, shape (bending), and quality of foot lifting, by visual inspection or by using a gauge to select non-defective products.

Problems to be Solved by the Invention However, since quality inspection of such filament coils involves visual inspection by a human or a gauge, it is particularly difficult to judge whether the condition of the leg is good or bad. This foot floating state refers to the case shown by the dashed line in FIGS. 3(A) and 3(B), and is allowed if the foot height, h2, is less than a predetermined value. If a non-standard filament coil with a leg part that is floating is incorporated into a lamp without being sorted out, the coil part 1b will be bent, and as a result, the desired lamp characteristics may not be obtained. there were.

The present invention provides an automatic filament coil dimension inspection method that can automatically select filament coils of stable quality.

Means for Solving the Problems The automatic filament coil dimension inspection method of the present invention includes a coil portion and both leg portions extending in opposite directions from both ends of the coil portion and provided along the coil axis. The jig includes a jig for continuously moving the filament coil in one direction, and a rotation gauge installed in the moving path of the filament coil, and the jig has a semicircular groove for accommodating the coil portion; The filament coil has a stepped portion adjacent to the groove for positioning both feet of the filament coil at a height that is within the allowable height of the foot portion, and further includes a step portion provided adjacent to the groove at a height that is within the permissible limit of the height of the foot portion. It has a configuration in which it is provided facing this stepped portion at the limit height position.

According to this configuration, if the filament coil is in good condition, that is, if its foot is not in a floating state, or even if it is, but the foot height is within the allowable range, the rotation gauge will detect the foot. The filament coil moving on the jig passes through the rotation gauge. On the other hand, if the filament coil is defective, that is, if its foot is floating and the height of the foot is outside the allowable range, the rotation gauge will hit the foot and it will not be able to pass through the rotation gauge. Photographed from above the jig.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, filament coils 1 are successively fed to a jig 3 by a parts feeder 2. The jig 3 has a semicircular groove 3a that matches the outer diameter of the coil portion 1a of the filament coil 1, and further positions the foot portion 1b of the filament coil 1 and adjusts the foot heights hl and h2. It has a stepped portion 3b provided adjacent to the groove 3a at an allowable height. In order to keep the direction of the foot portion 1b constant, the jig 3 is
It is fixed with an inclination angle of 15° to 20°.

A disk-shaped rotation gauge 4 having notches at predetermined intervals is installed in the stepped portion 3b at a height H) that is the permissible limit of the stepped portion (see FIG. 2). The rotation gauge 4 is connected to a motor 6 via a shaft 5, and rotates in the direction of the arrow.

A chute 8 for accommodating good filament coils 1 in a box 7 is installed below the side of the jig 3.

Now, the filament coil 1 is transferred to the jig 3 by the parts feeder 2. Then, the transferred filament coil 1 is moved in one direction by the slight vibration of the jig 3. Here, if the filament coil 1 is good, that is, the foot part 1b
If the feet are not in a floating state, or even if they are, if the foot heights ht and h2 are within the predetermined range, the rotation gauge 4 will be adjusted as shown by the solid line in Fig. 2. Foot part 1
b, the filament coil 1 passes through the rotation gauge 4 and is housed in the box 7 through the chute 8. On the other hand, if the filament coil 1 is defective, that is, the foot portion 1b is in a floating state, and the foot heights hI, h2
is out of range, as shown in FIG. 2 by the dashed line, the rotation gauge 4 indicates whether the tip of one leg 1b is P+ or
Alternatively, the filament coil hits the bent portion P2 of the other leg, and therefore, this filament coil is dropped from the jig 3.

As described above, according to the method of the embodiment of the present invention, it is possible to automatically inspect whether the foot portion 1b of the filament coil 1 is in a floating state, thereby increasing the accuracy of selecting non-defective products.

Next, an experimental example in which the effects of the present invention were confirmed will be described.

1000 filament coils each having the configuration shown in FIGS. 3(A) and 3(B) were judged to be non-defective by using the conventional dimensional inspection method using visual inspection and a gauge, and the dimensional inspection method of the present invention. When we measured the foot height of each of these 2000 pieces using a measuring device, we found that 1000
In contrast, 10 out of 1,000 items contained non-standard items, whereas in the method of the present invention, 10 out of 1000 items did not contain any non-standard items. As described above, it has been confirmed that the automatic dimension inspection method of the present invention has significantly improved inspection accuracy compared to the conventional method.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, according to the present invention, it is possible to significantly improve the inspection accuracy of the foot dimensions and angles of filament coils compared to the conventional methods, and as a result, shape 2 in the lamp manufacturing process can be improved.
It is possible to obtain a lamp with stable dimensions and less variation in lamp characteristics. In addition, inspection of filament coils can be automated and lamp costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of an apparatus for carrying out the method of the present invention, FIG. 2 is a diagram for explaining the inspection of the star-floating state of the foot of a filament coil using the same apparatus, and FIG. 3 (A
) and (B) are a front view and a plan view of the filament coil. 1...Filament coil, la...
Coil part, 1b... Foot part, 2... Parts feeder, 3... Jig, 3a... Groove, 3b... Step Section 4...Rotation gauge. Name of agent: Patent attorney Shigetaka Awano and one other child
Teru-37 Kankuni Koumaru q sa

Claims (1)

[Claims] A jig for continuously moving a filament coil in one direction, the filament coil having a coil part and both legs extending in opposite directions from both ends of the coil part and provided along the coil axis; and a rotation gauge installed in the moving path, and the jig has a semicircular groove for accommodating the coil portion, and positions both feet of the filament coil, and has an allowable limit for the height of the feet. and a stepped portion provided adjacent to the groove at a height of
The automatic dimension inspection method for a filament coil is further characterized in that the rotation gauge is provided at a height position within the permissible limit of the stepped portion, facing the stepped portion.