Feeder of wire solder

Details Feeder of wire solder Feeder of wire solder

1999-04-26

2001-04-10

Evans, Geoffrey S. (Department: 1725)

Metal fusion bonding

Including means to apply flux or filler to work or applicator

Solid flux or solid filler

C228S008000, C228S011000

Reexamination Certificate

active

06213374

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a feeder of wire solder used for soldering electronic components.
BACKGROUND OF THE INVENTION
A light beam heating apparatus which heats up a local spot without touching the local spot is widely used for soldering small size electronic components. Wire solder or cream solder is used in general when the light beam heating apparatus is employed. A conventional feeder of wire solder employed in a soldering machine is described with reference to FIG.
4
A and FIG.
4
B.
FIG. 4A
shows an entire structure of the conventional feeder, and
FIG. 4B
shows an essential part thereof.
In this conventional feeder of wire solder, wire solder detector
2
monitors whether wire solder
1
travels to feeding roller
3
normally free from discontinuation, and then roller
3
feeds wire solder
1
into guide tube
7
a.
Part of guide tube
7
a
is cut away, and wire solder
1
is exposed therefrom. The exposed wire solder
1
contacts shaft
5
a
of rotary disc
4
a.
The travel of wire solder
1
drives shaft
5
a,
which is integrated with disc
4
a,
and then disc
4
a
also rotates. The rotation of disc
4
a
is converted into a detection signal by rotation sensor
4
b.
This electric signal is sent to feeding controller
6
, which sends a rotation instructing signal to a motor
9
that drives feeding roller
3
.
When wire solder
1
normally travels, the detection signal by sensor
4
b
synchronizes with the rotation instructing signal supplied to motor
9
. When wire solder
1
is at a normal halt status, the detection signal also synchronizes with the rotation instructing signal. Feeder controller
6
determines whether wire solder is normally fed or at a halt by comparing and calculating the rotation instructing signal and the detection signal converted by sensor
4
b.
If some abnormality occurs in the feeding of wire solder
1
, the two signals do not synchronize with each other. Then controller
6
determines that some abnormality has occurred in the feeding, and immediately stops sending the rotation instructing signal to motor
9
. After passing through guide tube
7
a,
wire solder
1
travels into feeding-direction-fine-adjuster
8
via feeding tube
7
. Adjuster
8
adjusts a feeding direction of wire solder
1
, which is then sent to a precise location requiring the soldering.
The conventional feeder, however, has the following problem. In the conventional feeder, the shaft
5
a
of rotary disc
4
a
directly contacts wire solder
1
, so that the feeding condition of wire solder is detected. The rotational accuracy of disc
4
a
depends on the friction factor between wire solder
1
and the shaft
5
a.
The friction factor is determined by the material of wire solder
1
and the material of the shaft
5
a.
Therefore, wire solder
1
tends to slip on the shaft
5
a,
which often misleads the controller
6
in determining to stop feeding of the wire solder
1
, even though it is normally fed.
SUMMARY OF THE INVENTION
The present invention addresses the problem discussed above and aims to provide a feeder of wire solder in which slip between the wire solder and a rotary disc is prevented so that the accuracy of detecting abnormalities such as clogging wire-solder, crimped wire-solder and the like can be improved. It is thus expected that the feeding of the wire solder can be monitored with more accuracy.
To realize the object discussed above, one mode of the feeder of wire solder of the present invention includes a rotary disc, at least part of which contacts the wire solder being fed, and the rotary disc rotates following the travelling of the wire solder. Material which boosts the friction factor between the rotary disc and the wire solder is provided on the contact part of the disc.
To further realize the object discussed above, another mode of the feeder of the present invention includes a rotary disc, at least part of which contacts the wire solder being fed, and the rotary disc rotates following the travelling of the wire solder. Peaks and valleys are provided in the contact section of the rotary disc.
To further realize the object discussed above, still another mode of the feeder of the present invention includes a feeding roller for feeding a wire solder and a rotary disc, at least part of which contacts the wire solder being fed, and the rotary disc rotates following the traveling of the wire solder. Peaks and valleys are provided in the contact section of the rotary disc. Further, peaks and valleys which mate with those on the rotary disc are provided on a contact part of the wire solder of the feeding roller.
The feeder of wire solder having one of the constructions discussed above can increase the friction factor between the wire solder and the rotary disc so that slip therebetween can be prevented. As a result, abnormalities in the feeding can be accurately detected, thereby remarkably improving the efficiency of soldering work.


REFERENCES:
patent: 3830420 (1974-08-01), Milana et al.
patent: 4268739 (1981-05-01), Evans
patent: 5526975 (1996-06-01), Endo
patent: 5813591 (1998-09-01), Quinn et al.
patent: 5839642 (1998-11-01), Tait
patent: 5975403 (1999-01-01), Ueda et al.
patent: 6027068 (2000-02-01), Lantsman

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