ES2354547B2 - FABRIC AND MACHINE FOR THE MANUFACTURE OF BAGS. - Google Patents

Abstract

Fabric and bag making machine. The fabric consists of two independent superimposed fabrics. intertwined in transverse and longitudinal stripes determining selvedges between which there are areas of union with warp threads floating and joining areas with floating weft threads; and the machine, from at least one tissue coil formed by a band with transverse joining areas with warp threads floating includes means for dragging, tensioning and alignment of the fabric, means for transverse and angular or curved cutting, and means for stacking manufactured bags. The means for drag, tension and aligned tissue consist of a comb cross traces that are introduced in areas with threads floating warp and that is scrollable and retractable, running motorized below a platform on which it is dragged the tissue.

Description

Fabric and machine for manufacturing bags

Object of the invention

Fabric and machine for manufacturing bags

Background of the invention

There are different models of bags made in different materials, being the most used plastic, tissues and paper, which are obtained with different procedures

Plastic bags are very economical and easy to manufacture by welding and die cutting, and They are generally used for single use, for example in the purchase in establishments, mainly in supermarkets and similar stores, said degradable material not being constituted A serious problem like waste.

Paper bags, although their manufacture is more complex, they are also economical but not resistant So its use is limited.

As for the tissue bags are the most ecological and have remarkable resistance, however they have the Handicap of its high price due mainly to the operations of cutting and sewing in its preparation.

Summary of the invention

The object of this invention is a fabric and a machine for the manufacture of bags without any sewing.

Using the fabric in question in the machine the bags are obtained directly which results in a cost low that allows to compete with those of plastic material, being able to be used as single use, however given its constitution They can be used several times.

The fabric is constituted by two independent superimposed fabrics interwoven in transverse and longitudinal stripes determining edges between which there are areas of union with floating warp threads and areas of connection with floating weft threads.
tes.

From this fabric bands with zones are formed cross ties with floating warp threads that are the that are installed in the machine wound to manufacture the bags

At least one coil is installed in the machine fabric and comprises means for dragging, tensioning and aligning the fabric, means for transverse and angular or curved cutting, and means for stacking manufactured bags.

The means for dragging, tensioning and alignment of the tissue consist of a transverse barbed comb that is introduced into areas with floating warp threads and that is scrollable and retractable, running motorized below a platform with longitudinal slits on which it is dragged the tissue.

The means for cross-cutting consist in a pneumatic execution cylinder bearing a cutter electric, with which a pneumatic tamper that maintains the tissue tensioning.

The stacking means comprise a tray receiver with reciprocating and vertical movements to which the bags and where they are deposited.

These and other features will come off better than the detailed description that follows, to facilitate which It is accompanied by three sheets of drawings in which it has been represented a practical case of realization that is cited only by way of non-limiting example of the scope of the present invention.

Description of the drawings

In the drawings:

Figures 1 and 2 respectively show the fabric used and the band obtained from it will be winding for installation on the machine,

Figure 3 illustrates the machine in perspective to make the bag,

figure 4 represents in perspective the detail of the barbed comb,

Figure 5 indicates in perspective the platform on which the tissue is dragged, and

Figure 6 is a perspective of an example of the means for angular or curved tissue cutting.

Description of a preferred embodiment

According to the drawings the fabric used for the manufacture of bags is constituted by a double fabric disengaged (1) with weft-free feed with floating warp threads (2) (fabric width) and with empty comb whites with threads of floating weft (3) (fabric length) joining the edges (4) of The double fabric of this fabric is cut longitudinally bands (5) (figure 2) by the floating weft threads (3).

The machine (6) comprises a support (7) where they install four superimposed coils (8) (formed by bands (5) of tissue) which are centered to specify the situation of selvedges (4) facing the cross section and the final stacking. For said centering are provided photoelectric sensors (9) that give the signal to two endless electric linear actuators (10) of guided, with built-in limit switches, comprising the part drive a linear bearing (11).

A system of bobbins is planned adjustable brake (not shown) to be used in the event that The coil has an inertia greater than the stretch.

The photoelectric sensors (9) are incorporated into liner assemblies (12) that adjust the tension of the tissue in each coil.

The means for dragging, tensioning and alignment of the tissue comprise a barbed comb (13) (figure 4) that is enter the zones with floating warp threads (2) and that is movable by linear guides (14) with double circulation of balls (15) by the action of a servomotor motor (16), which incorporates an encoder inside obtaining precision in the stop, and to which a reducer (17) is attached.

The barbed comb (13) is also retractable by the action of pneumatic cylinders (18 and 19) of execution parallel.

For the search by the barbed comb (13), a thread is provided in the floating warp zone (2) frame (20) of different color detected with a sensor Photoelectric (21) of fiber optic incorporated in the barbed comb (13) (figure 4), which runs under a platform (22) (figure 5) with longitudinal slits (22 ') for the passage of comb spikes and on which the tissue is dragged, presenting said platform a window (22 '') through which the photoelectric sensor (21).

The comb (13) once the mark formed by the weft thread (20) ascends to drag the tissue, then activates a limit switch sensor (23) that stops the drag and a pneumatic ram (24) keeps the tension of the stretch down then the barbed comb (13) to proceed next to the cross section through the center of the floating warp threads (2) by means of a pneumatic execution cylinder (25) carrying a electric cutter

The means of stacking the bags (B) manufactured comprise a motorized receiving tray (26), with reciprocating movements on a base (27) (figure 3) and vertical by guides (28) and with a down sensor (29), which reach the bags delivered from a motorized transport band (30) on two end rollers (31), and synchronized with the tray recipient (26).

An alternative to the transport band (30) It consists of the arrangement of four pneumatic clamps (32) in the side of the platform (21) (figure 5) that will hold laterally the bags and will drive and deposit by gravity on the receiving tray (26).

Angular or curved cutting can be done using different systems advantageously incorporated into the machine and arranged before stacking means.

An example of the cutting system could be the depicted in figure 6 comprising electric cutters (33) with rotary disc driven by pneumatic cylinder (34) without rod with limit switch, or operated with a electric motor and pulleys, with reference (35) a tray comprising the cutting means and guides (36) of displacement of said means.

With the angular or curved cut (C) are determined the handles of the bag (B) it is understood that the cutting system for get the handles of the bag can be any other, for example by a bridge die using a motorized band in the bottom.

The invention, within its essentiality, can be put into practice in other embodiments that differ only in detail from that indicated solely by way of example, which will also achieve the protection that collect. It will be possible, then, to make these fabrics and machines for manufacture of bags, with the most materials and accessories adequate, for being all included within the spirit of The claims.

Claims (8)

1. Fabric for the manufacture of bags, characterized in that it is constituted by two independent superimposed fabrics interwoven in transverse and longitudinal strips determining edges between which there are areas of union with floating warp threads and areas of union with floating weft threads, characterized in that the transverse junction zones have a no-weft advance of the floating warp threads, and the longitudinal jointing areas have empty comb clearances that determine the floating weft threads. 2. Fabric for the manufacture of bags, according to claim 1, characterized in that it forms a band with transverse joining areas with floating warp threads. 3. Machine for making bags with the fabric of claim 2, which, from at least one tissue coil, comprises means for dragging, tensioning and aligning the fabric, means for transverse and angular or curved cutting, and means for the stacking of the manufactured bags, characterized in that the means for the dragging, tensioning and alignment of the fabric consist of a transverse barbed comb that is introduced in the zones with floating warp threads and that is movable and retractable, running motorized below of a platform with longitudinal slits on which the tissue is dragged. 4. Bag-making machine according to claim 3, characterized in that it comprises a sensor that detects a weft thread of different color to determine the area of the fabric where the barbed comb is to be introduced. 5. Machine for making bags, according to claim 3, characterized in that the means for cross-cutting consist of a pneumatic execution cylinder carrying an electric cutter, with which a pneumatic ram that maintains tissue tensioning collaborates. 6. Bag making machine according to claim 3, wherein the stacking means comprise a receiving tray with reciprocating and vertical movements to which the bags arrive by delivery from a motorized transport band synchronized with the receiving tray, characterized in that the stacking means comprise, on the sides of the platform on which the fabric is dragged, pneumatic clamps that hold the bags laterally and conduct them and deposit on the tray
Receiver 7. Bag making machine according to claim 3, characterized in that the means for angular or curved cutting comprise rotary disk electric cutters driven by pneumatic cylinders. 8. Machine for making bags, according to claim 3, characterized in that the fabric coils are arranged centered in superposition and are guided by photoelectric sensors towards tissue tensioners that line it towards the drag platform of the superimposed fabrics.