Wireworking – Joining wire – Implements
Patent
1996-02-09
1997-11-04
Larson, Lowell A.
Wireworking
Joining wire
Implements
140 52, B21F 1504
Patent
active
056829272
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a tying method and an apparatus therefor for automatically tying, by linear tying materials, bar-like articles such as reinforcements or heat insulating sheets, for pipes and ducts and various other articles.
BACKGROUND OF ART
In the past, in the operation for arrangement of reinforcements in the construction work, for example, the tying and securing of portions of reinforcements placed one above another have been carried out by manual operation. Generally, an iron wire used as a tying material is bent in advance into two parts so as to have a U-shape. The U-shape wire is extend over a portion of reinforcements placed one above another. A hook-like tool is hung on a bent portion of the iron wire and is then rotated several times, and opposite ends of the iron wire are twisted each other to bind the portions placed one above another.
For the tying in the above-described operation for arrangement of reinforcement, it is necessary to firmly grip and twist the opposite ends of the iron wire extended over the portions placed one above another. However, it is difficult to powerfully grip the iron wire due to the manual operation. Therefore, there existed an disadvantage that the iron wire tends to be loosened, failing to firmly bind the reinforcement. On the other hand, there is a problem in that when excessive twisting is earned out in order to provide a strong tying, an iron wire ruptures, lacking in reliability. Moreover, such an operation requires great skill and heavy labor, resulting in a poor operating efficiency. Thus, mechanization therefor has been demanded.
As a machine to meet the above-described demand, there has been proposed a tying machine capable of automatically tying reinforcements (for example, see Japanese Patent Laid-Open No.63(1988)-191719 Publication, etc.). However, tying machines heretofore proposed suffer from a problem in that any of these machines is very complicated in construction, is heavy and is expensive. Further, in any of these conventional machines, a single iron wire is drawn out of a bobbin and wound around a joined portion of reinforcements with that single iron wire to bind the joined portion, and therefore it is necessary to wind the object several times in order to provide a firm tying. This leads to a problem in that a quantity of consumed tying materials increases accordingly, resulting in a higher cost of wires to be used; in addition, the single wire tends to be ruptured; and a strong tying force is hard to obtain as compared with the tying through manual operation. The tying machine which fulfills the aforementioned demand has not yet been proposed.
Further, a motor for driving a tying mechanism such as feeding, twisting, etc. of automatic tying materials, in a portable automatic tying apparatus, it is necessary to employ such a motor as small as possible in order to make the tying machine small and light-weight. However, the tying mechanism is repeatedly rotated intermittently, normally and reversely. Therefore, in the case of a small motor, it becomes worn so early that the service life thereof ends after about 150,000 tyings. In the past, even if a motor becomes worn, the motor alone could not be replaced. For this reason, even if the tying mechanism portion is in a good condition, the tying machine itself cannot be used longer than the life of the motor, leading to a problem in terms of service life.
Accordingly, it is an object of the present invention to provide a tying method capable of tying articles such as reinforcements positively, automatically and in a short period of time with a strong tying force, and a tying apparatus in which the tying method can be achieved by a device which is simple in construction, small and light in weight.
It is a further object of the present invention to provide an automatic tying method and an apparatus therefor, which can firmly bind an article with a short tying material and can reduce consumption of tying materials.
It is a more specific object of the present inventio
REFERENCES:
patent: 3368590 (1968-02-01), Welden
patent: 5431196 (1995-07-01), Forester, Jr. et al.
patent: 5505504 (1996-04-01), Sato et al.
Kaneko Youzou
Saito Tsutomu
Takahashi Seiichi
Bentac Co., Ltd.
Larson Lowell A.
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