1. Field of Invention
The invention concerns a bag-making device for cross base bags.
2. Description of the Prior Art
These devices are known and are acknowledged, e.g., in the document DE 198 05 321 C1. In more recent times, there has been an increasing demand for cross base bags with small volumes. Cross base bags can have a small volume by means of a smaller base middle measurement. However, the manufacture of bags with smaller base middle measurement requires the implementation of extensive constructive changes in the means of production, primarily in bag making devices. Since the bags are conveyed at right angles to the principal axis of the tube through the working station of the bag-making device, both the working stations and also the conveyor system have to be formed in a narrower configuration than they have been previously.
One of the necessary measures is the use of narrower conveyor belts for conveying the bags through the working stations of the bag-making device. However, the conveyor belts are exposed to a considerable amount of tensile stress and run the risk of being stretched. This tendency increases with the decreasing breadth of the conveyor belt. The result of changing the length of the conveyor belt in the operation, however, is that the bag positions in the working stations no longer correctly align with the rotary motions of the tool rollers. The tools run through their machining position when the bag is not yet or is no longer located at the right place, and the related working step is executed inaccurately. As a result, the normal fabrication tolerances of the bags can be exceeded, resulting in serious quality defects in the bags, e.g., leakiness and lack of durability. These consequences are highly undesirable.
For these reasons the use of conveyor belts is recommended that have at least components made of tensile-stressable material such as steel. Typically these components of the belt are coated with a more elastic and softer material that prevents the conveyed items from being damaged. In this context the so-called cable cord belts may be employed that contain steel in their core and are usually coated with rubber.
Unfortunately conveyor belts of the above-described kind have fabrication tolerances that can be exceeded when the belt is stretched. The result of these fabrication tolerances is once again imprecisions in the positioning of the bags in the machining positions and thus in the fabrication tolerances of the bags.
Therefore an object of the present invention is to provide a device that restricts the quality defects that are brought about by the exceeded fabrication tolerances of the conveyor belt.
This task is solved thus:
The present invention makes use of a whole series of surprising findings.
In the use of conveyor belts having components of tensile-stressable material such as steel and a softer protective covering and/or a softer coating, the conveying process of the bags is first determined by the tensile-stressable material.
Thus the angular speed of the transport discs and the distance of the tensile-stressable material from the axis of the transport discs are decisive factors for determining the conveying speed of the bags in the working stations.
The distance of the tensile-stressable material from the axis of the transport discs is referred to herein as the effective disc radius. The effective disc radius is the actual radius of the drive wheel and the thickness of the elastic, soft layer between the outer circumference of the transport disc and the tensile-stressable material. However, the thickness of this layer is subject to variations that are transferred to the effective radius of the transport discs and thus to the conveying speed.
These variations are mainly responsible for the imprecisions in the positioning of the bags in the working stations. By the measures in accordance with the invention, the relative portion of the variations in the thickness of the elastic, soft layer between the outer circumference of the transport disc and the tensile-stressable material is reduced to the effective radius of the transport disc and thus to the conveyance speed.
What proves to be particularly advantageous is a configuration in which the ratio of the angular speed of the drive wheels to the angular speed of the processing rollers is 2:3. Due to this ratio of the angular speed of 2:3, the speed droop of the conveyor belt also reduces by the factor 2:3 as compared to when the drive wheels have the same angular speed as the processing rollers.
It is advantageous to provide a drive system that with the help of a bevel gear diverges torque moment for at least one drive wheel from a line shaft (vertical shaft with bevel gears) and transfers it onto the drive wheel via a planetary gear placed underneath.
An embodiment of the configuration of the invention is presented in the drawings and the objective description.
The individual drawing figures illustrate:
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The conveyor belt 3 is designed as an endless conveyor and entwines deflection rollers at both the ends of the bag-making device. The drive of the conveyor belt 3 takes place by the drive wheels 4. These are driven by the gears 5 that start from the line gear 12 and that are described in more detail on the basis of
The speed of the conveyor belt 3 and also the conveying speed of the tube sections 1 result from the distance covered per time unit. The distance covered, however, depends on the distance between the steel cord 13 (
As can be seen in
The present invention is particularly advantageous in that it provides a configuration in which the ratio of the angular speed of the drive wheels 4 to the angular speed of the processing rollers 7, 9 is 2:3. By virtue of this ratio of the angular speed being 2:3, the speed droop of the conveyor belt 3 reduces accordingly by the factor of 2:3 as compared to a configuration in which the drive wheels 4 have the same angular speed as the processing rollers 7, 9.
The invention being thus described, it will be apparent that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be recognized by one skilled in the art are intended to be included within the scope of the following claims.
Number | Date | Country | Kind |
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102 61 256 | Dec 2002 | DE | national |
This application is a continuation application of U.S. application Ser. No. 12/292,958, filed Dec. 1, 2008, which was a continuation application of U.S. application Ser. No. 10/531,256, filed Apr. 13, 2005, the disclosures of which are incorporated by reference as if fully set forth herein. The predecessor application U.S. application Ser. No. 10/531,256 is a nationalization of PCT/EP03/013801 filed Dec. 5, 2003, and published in German.
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Number | Date | Country | |
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Parent | 12292958 | Dec 2008 | US |
Child | 12923288 | US | |
Parent | 10531256 | US | |
Child | 12292958 | US |