Knife folder

Details Knife folder Knife folder

1998-04-27

2000-06-13

Kim, Eugene

Manufacturing container or tube from paper; or other manufacturi

Container making

Pliable container

493437, 493444, 493445, B31B 2126, B31B 2326

Patent

active

060743328

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention refers to paper processing devices in general and in particular to a knife folder for folding a sheet material that can, for example, be printed paper.


DESCRIPTION OF PRIOR ART

Knife folders are known from the field of technology. In such knife folders a sheet feed belt is arranged e.g. horizontally. In side-by-side relation with the sheet feed belt, a pair of rollers is arranged in such a way that the axes of rotation of both rollers are located in one plane which extends parallel to the surface of the sheet feed belt. The distance of the plane in which the axes of rotation of the pair of rollers are located is chosen such that a sheet material transported by the sheet feed belt is pushed from the sheet feed belt evenly over the pair of rollers. Normally, a folding knife is located centrally above the pair of rollers; said folding knife is secured to a lever and it is adapted to be moved cyclically to a folding position by means of said lever and a cam disc arrangement. When the folding knife occupies the folding position, a folding edge, which is formed at the lower end of said folding knife, is oriented such that a small distance exists between the plane defined by the axes of rotation of the pair of rollers and the folding edge of the folding knife. In addition, the folding edge is essentially at the same distance from both axes of rotation. On the side located opposite the sheet feed belt relative to the pair of rollers, a horizontally displaceable stop for the sheet material is provided.
In a known knife folder of this kind, the sheet feed belt transports the sheet material into the folding area. The horizontal movement of the sheet material is limited by the stop for the sheet material, the position of the stop determining the position of the fold on the sheet material. When the sheet material has reached the folding position, the folding knife is moved towards the sheet material substantially at right angles thereto. The folding edge of the folding knife comes into contact with the sheet material and presses the contact area, which exists between said sheet material and said folding edge and which is substantially linear, between the pair of rollers. This has the effect that areas of the sheet material which are separated by the contact area are raised relative to said contact area. The contact area of the sheet material and of the folding edge now approaches the plane defined by the axes of rotation of the two rollers of the pair of rollers.
The combined effect of the two rollers, one of said rollers being a driven transport roller and the other an idling counterpressure roller, has the effect that, as soon as the two rollers take hold of the sheet material in the contact area, they advance said sheet material in the direction predetermined by the direction of movement of the folding knife into the folding position. The engagement between the pair of rollers and the sheet material causes the sheet material to be folded at the point of the contact area due to the pressure which the pressing roller applies to the transport roller.
The folding effect existing due to the combined effect of the transport roller and of the pressing roller takes place essentially only at the moment at which the contact area of the sheet material and of the folding knife is located precisely in the plane defined by the axes of rotation. In view of the elasticity of the sheet material, the paper fold is hardly improved still further when the contact area of the sheet material and of the folding knife is located below the plane defined by the axes of rotation of the pair of rollers and when the sheet-material areas bordering on said contact area run through said pair of rollers.
When the sheet material has passed the pair of rollers completely, its direction of movement must be changed by a rerouting means so as to move said sheet material back into the plane of a paper processing line comprising the sheet feed belt and the knife folder as component parts.
For further process

REFERENCES:
patent: 3926425 (1975-12-01), Pierce et al.
patent: 3995850 (1976-12-01), Hertrich et al.
patent: 4338088 (1982-07-01), Buss et al.
patent: 4493690 (1985-01-01), Niemiro et al.
patent: 5085625 (1992-02-01), Kojima

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