ES1268630U - Sheet Welding Machine - Google Patents

Abstract

Sheet welding machine, comprising: - a table (1) where a first and second plates are placed, - a welding module including an upper welder (2) and a lower welder (3), which weld the first and second sheets to each other, characterized in that the upper welder (2) of the welding module is movable vertically and horizontally with respect to the table (1), between: - a rear limit position, in which the first sheet is fixed on the table (1); - a front limit position, in which the position of the second sheet partially superimposed on the first sheet is fixed, and in which the first sheet is squeezed to prevent its movement; and - a welding position, in which the first and second sheets are welded to each other. (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

Sheet Welding Machine

The present invention relates to a sheet welding machine.

Background of the invention

Different techniques for overlapping by welding foils, for example of thermoplastic material, are well known. The known techniques can be classified into two large groups: dielectric heating welding (also called high frequency heating welding) and thermal heating welding.

The overlapping by welding with dielectric heating is based on the application of a high frequency alternating electrical voltage (of the order of 10 MHz) between two plates (electrodes) and between which the sheets to be welded are located. Said electrical voltage causes the sheets to vibrate at the molecular level with the consequent rise in their temperature until reaching the melting temperature in the material of the contact area. Then, usually by additionally applying compression between the sheets and after cooling of the sheets, overlap by welding occurs.

On the other hand, in the overlap by welding with thermal heating, said heating is carried out by means of heat transfer by thermal conduction (for example, by contact with a hot surface or blowing hot air) or thermal radiation (for example, by infrared ). For this, one of the external surfaces of the sheets to be welded or both external surfaces at the same time, are heated by heat transfer from a heat source. The heat transfer is carried out for the time necessary to reach the melting temperature in the material of the contact surfaces of the sheets. Then, normally by additionally applying a compression between the sheets and analogously to the prior art, after cooling of the sheets, overlap by welding occurs.

Currently known thermally heated sheet welding machines comprise a welding module, which performs welding with dielectric heating or thermal heating, a rear limit, and a front limit.

The welding module comprises an upper welder and a fixed lower welder. The upper welder is a guide that, when the two sheets have been brought together, lowers to weld them. The time it takes to do this can also be predetermined by a computer that manages the machine (heating and welding time and cooling time). When the weld ends, it rises, leaving the two sheets together free.

The rear limit is a horizontal guide that allows to fix the first sheet that is put in the machine.

The front limit is a vertical movement guide whose utility is twofold: first, it fixes the position of the second sheet (which is superimposed on the first by a predetermined distance for welding), and secondly, it squeezes the first sheet to prevent its movement, allowing the positioning of the second sheet with precision and safety.

Obviously, the need to use three components for these functions: welders, rear limit and front limit increases the cost of the machine.

Furthermore, in currently known machines some guides are pneumatic, so they consume a lot of energy to generate the necessary air.

Description of the invention

Therefore, an objective of the present invention is to provide a sheet welding machine in which the cost of manufacturing and maintenance is lowered, by reducing the number of parts, since the welding functions, upper limit and lower limit are made using a single piece.

With the welding machine of the invention it is possible to solve the aforementioned drawbacks, presenting other advantages that will be described below.

The sheet welding machine according to the present invention comprises: - a table where a first and second sheets are placed,

- a welding module including an upper welder and a lower welder, which weld the first and second sheets to each other,

in which the upper welder of the welding module is vertically movable and horizontally with respect to the table, between:

- a rear limit position, in which the first sheet is fixed on the table;

- a front limit position, in which the position of the second sheet partially superimposed on the first sheet is fixed, and in which the first sheet is squeezed to prevent its movement; Y

- a welding position, in which the first and second sheets are welded to each other.

Advantageously, the upper welder is mounted on a carriage mounted on a displacement guide.

Furthermore, in the sheet welding machine according to the present invention, the lower welder is fixedly mounted on the table.

Advantageously, in order to weld the sheets forming a pocket, the sheet welding machine according to the present invention also comprises a folding module, which is preferably mounted on the carriage, located next to the upper welder.

The machine according to the present invention achieves, among others, the following advantages:

First, the cost of manufacturing and maintenance is lowered by reducing the number of parts.

In addition, fewer adjustments are required, which means faster assembly.

The machine according to the present invention is also more ecological than conventional machines, since all the elements are totally electric, generating less energy consumption, as it does not need a compressor, which produces more savings in manufacturing costs, maintenance and assembly.

Brief description of the drawings

For a better understanding of what has been stated, some drawings are attached in which, schematically and only as a non-limiting example, a practical case of embodiment is represented.

Figure 1 is an elevation view of the welding machine according to the present invention, in the rear limit position;

Figure 2 is an elevation view of the welding machine according to the present invention, in the welding position; Y

Figure 3 is an elevation view of the welding machine according to the present invention, in the forward limit position.

Description of a preferred embodiment

As shown in the figures, the sheet welding machine according to the present invention comprises a table 1 on which are placed a first and second sheets (not shown in the figures) that are welded together.

The welding machine of the present invention also comprises a welding module formed by an upper welder 2 and a lower welder 3.

The upper welder 2 is movable vertically and horizontally with respect to the table 1, and the lower welder 3 is located fixedly on the table 1.

To allow this vertical and horizontal displacement, the upper welder 2 is located on a carriage 4 that is mounted on a displacement guide 5.

The upper soldering iron 2 can be placed in the following positions, performing the following functions.

First, the upper welder 2 is placed in a rear limit position, shown in figure 1, in which the first sheet is fixed on the table 1, moving the upper welder 2 vertically until it contacts the first sheet.

Next, the upper welder 2 is placed in a forward limit position, shown in figure 2, in which the position of the second sheet partially superimposed on the first sheet is fixed, and in which the first sheet is squeezed to prevent its movement, moving the upper welder 2 vertically until it contacts both sheets.

Finally, the upper welder 2 is placed in a welding position, shown in figure 3, by a horizontal movement of the upper welder 2 from the position shown in figure 2, in which the upper welder 2 is vertically aligned with the welder. bottom 3, and in which the first and second sheets are welded together. To do this, the upper welder 2 moves vertically until it contacts both sheets.

If desired, the operator can choose to have the upper welder 2 be placed first in the rear limit position or that it be placed first in the front limit position, changing the order described above.

It should be noted that the movements of the upper welder 2 are controlled by a control means, such as a computer, which determines these movements and the welding time and the cooling time, until the upper welder 2 is removed from this position.

To weld the first and second sheets forming a pocket, the welding machine also comprises a folding module 6, which performs a pre-folding to form said pocket before welding.

This folding module 6 is also mounted on the carriage 4, located next to the upper welder 2, as shown in the figures.

Despite the fact that reference has been made to a specific embodiment of the invention, it is clear to a person skilled in the art that the described machine is susceptible to numerous variations and modifications, and that all the mentioned details can be replaced by other technically equivalent ones, without departing from the scope of protection defined by the appended claims.

Claims (6)

1. Sheet welding machine, comprising: - a table (1) where a first and second plates are placed, - a welding module including an upper welder (2) and a lower welder (3), which weld the first and second sheets to each other, characterized in that the upper welder (2) of the welding module is movable vertically and horizontally with respect to the table (1), between: - a rear limit position, in which the first sheet is fixed on the table (1); - a front limit position, in which the position of the second sheet partially superimposed on the first sheet is fixed, and in which the first sheet is squeezed to prevent its movement; Y - a welding position, in which the first and second sheets are welded to each other. Sheet welding machine according to claim 1, in which the upper welder (2) is mounted on a carriage (4) mounted on a displacement guide (5). Sheet welding machine according to claim 1, in which the lower welder (3) is fixedly mounted on the table (1). Sheet welding machine according to claim 1 or 2, comprising a folding module (6). Sheet welding machine according to claim 4, in which the folding module (6) is mounted on the carriage (4). Sheet welding machine according to claim 4 or 5, in which the folding module (6) is located next to the upper welder (2).