Tool for tensioning and cutting off a tape loop placed about an

Details Tool for tensioning and cutting off a tape loop placed about an Tool for tensioning and cutting off a tape loop placed about an

1990-01-23

1992-02-18

Hornsby, Harvey C.

Presses

Binding

Binder tighteners and joiners

100 33R, 140 932, 1401236, B65B 1334

Patent

active

050883950

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a tool for tensioning and cutting off a tape loop placed about an object, the ends of which tape loop are led through a lock provided for their connection and one of which is connected to a tape supply, the tool comprising a support for the lock, an opening in the lock support for the passage of the tape ends, a tensioning device for the tape end, connected to the tape supply, a cutting device and a support device for the free tape end, which is formed from a clamp pressing the free tape end on one side against the other tape end supported by an abutment of the tool.
In a known tool of this type (DE-B-1,279,801), the cutting device is arranged directly behind the lock support, so that the tape ends projecting from the lock can be cut off as short as possible. This has the disadvantage that not only the tape end which is to be tensioned and which is connected to the tape supply must be cut off, but the free tape end must also be cut off so that waste pieces occur. However, in many forms of application (for example in aircraft construction), the occurrence of waste is unacceptable because it could cause damage at other points.
In such cases, those cable tapes whose tape is connected integrally to the head are therefore used (U.S. Pat. No. 3,154,114), and the cutting off of the protruding tape end is dispensed with, although this is also undesired. In so far as a cutting device for cutting off the protruding tape end is provided in tools for processing such one-piece cable tapes (U.S. Pat. No. 3,154,114), this cutting device is also arranged directly behind the head support, in order to ensure a small protrusion of the cut-off tape end out of the head. Cable tapes designed in one piece have the fundamental disadvantage that, because of the greater use of material, they are more expensive than those which consist of a section of an endless tape and special heads.
The object of the invention is to provide a tool of the type mentioned in the introduction which enables the processing of cable tapes using an endless tape without the occurrence of waste.
The solution according to the invention consists in arranging the clamp directly behind the lock or the lock support and the cutting device on the side of the clamp facing away from the lock support.
This solution allows the free tape end to end directly behind the clamp and in front of the cutting device so that no part of it has to be cut off and consequently no waste occurs either.
The cutting off of a tape end is only effective when the remainder left at the head is very short. Otherwise, it could cause a risk of injury because of its sharp cutting edge. It could not be expected that a tape end could be cut off to a sufficiently short length by the arrangement according to the invention. Conventional support devices for supporting the free tape end indeed have a considerable length in the direction of the tape extension. This is because they are given dimensions so as to completely absorb the maximum tensioning force. The invention has recognized that this is not necessary because of a peculiar effect. This is because when--as assumed by the invention--the free tape end is pressed by the support device against the tape end which is to be tensioned and which is connected to the tape supply, the maximum tension to be withstood by the clamp at the free tape end only occurs when the tape end to be tensioned is drawn in the tensioning direction and when a friction force is consequently exerted on the free tape end by the tape end to be tensioned, which reduces the supporting force required for securing the free tape end.
It is on the basis of this inventive recognition that an especially small clamping device, which is short in the tape direction, can be used, only a small distance between the lock and the cutting device being necessary for its accommodation. The cutting device can therefore be arranged on the side of the support device facing away from the lock and the cutting effect can be limited to the tape end connected to the tape supp

REFERENCES:
patent: 3101663 (1963-08-01), Hall et al.
patent: 3154114 (1964-10-01), Bailey
patent: 3489076 (1970-01-01), Countryman
patent: 3570554 (1971-03-01), Kabel
patent: 3670782 (1972-06-01), Kabel
patent: 3672295 (1972-06-01), Weller
patent: 3698310 (1972-10-01), Plattner et al.
patent: 4610067 (1986-09-01), Hara
patent: 4763700 (1988-08-01), Hidaka et al.

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