A machine for continuous manufacturing of netting bags

Abstract

 A procedure for the continuous manufacturing of netting bags,an improved machine for the implementation of said procedure and the netting bags coming out therefrom of the type which is using a nett­ing tube being cut at the ends to shape up closed containers after being filled. The process is generating the lateral feeding of bands of thermoweldable material for a concurrently application to the bags at their external and/or internal portions,in certain cases being determined thereby some areas of the thermoweldable materials without interruption from the bag head to the bag bottom; restrict­ed areas to the bag head and bottom and head derived flaps. The band flowing circuit is external and/or internal from the netting body. Bands are cut by two horizontally actuated opposing movable knives, downwardly placed at the band guiding and driving area and at the entry into the machine of the bands.

Description

[0001] The present invention relates to a procedure for continuous manu­facturing of netting bags, an improved machine for implementation of said procedure and the netting bags coming out from this imple­mentation.

[0002] The bag of the type being descrbed now is used to exhibit in the trade any product susceptible of being packaged in netting bags and is obtained by using the machine which would also be describ­ed herein,this machine allowing to do in a continuous,practical and logical manner a series of bags and bag filling with pieces of the above cited products,these pieces being introduced into the machine by means of a suitable feeding mechanism,and all that be­ing the procedure for manufacturing the bags and therefore also the object of the present invention.

[0003] There are known several types of machines for the continuous ma­nufacturing of netting bags,for instance the invention patent no. 8700529 owned by the applicant company,however these machines are at some disadvantages derived from their structural complexity which make that they are not much practical for any modification when this is thought possible on going from one type of bag to ano­ther or in other words when the appearance features of the bags are to be changed with the incorporation of bands of thermowel­dable material,external or internally arranged in the bags,these machines are thereby always operating with only a single type of netting bag.

[0004] The improvements in the machine object of patent no. 8700529 own­ed by the same applicant company which will soon be described he­rein are remarkable by the easiness with which its operating sys­tem can be modified,and all this allowing that bags are obtained differently shaped as related to the parts accompanying the netting envelope,this process being pursued by means of a relatively sim­ple operating unit and all that meaning a very remarkable advan­ce relative to the systems known so far.

[0005] Conventionally the new machine is provided with entries for seve­ ral bands of thermoweldable material designed to remain placed thereon and making up, if required, external or internal longitu­dinal faces and to determine a handle configuration at the head of each type of netting bags with an extension in the handle which is shaping a flap susceptible of carrying br ands and inscrip­tions or alternatively holding labels with other signs,for instan­ce, bar codes prnted or additionally making up a reinforcement at the bag bottom.

[0006] Another peculiarity of the present invention is the provision of a guiding arrangement of the laminar band or bands of thermowel­dable material,these bands are sent to the area where the part cutt­ing and welding is performed in the best operating conditions.

[0007] Another advantageous characteristic of the new machine is the pre­vious guiding of the netting tubular body and during the filling by means of the parts to be contained,all that originating a more reliable and smooth finish of the filled bags with the cited con­tents.

[0008] Characteristically the cutting of bands of thermoweldable material in suitable lengths to make up the bag head and bottom portions is achieved by means of a pair of opposing movable knives which are synchronized and placed near the remainder of the operating members,the length of the head pieces being adjusted by rack ope­rated side-shifting arrangements.

[0009] To understand better the description,the present disclosure is accompanied with drawings wherein an embodiment for a procedure in the continuous manufacturing of netting bags,a machine for the implementation of said procedure and the netting bags coming out therefrom by way of a non-exhaustive and illustrative example has been shown.

[0010] In the drawings:

Figure 1 shows a frontal view of the new machine's characteristic parts illustrating the travel circuit of the two bands of thermo­weldable material determining the existence of two external bands at the finished bag as is described in the previously cited patent no. 8700529.

Figure 2 is a machine arrangement analogous to the previous one, for the procurement of bags with a single side and external band.

Figure 3 is illustrating the continuous manufacturing of bags si­milar to the previous figure but with an internal band.

Figure 4 is related to the performance of a netting bag with two external bands,independently from those being formed at the head and reinforcement areas and figure 5 is similar to the previous one with two inside bands into the bag,both susceptible to carry on an additional flap for sign markings.

Figures 6 and 7 are illustrating how the bags are made with respec­tively external band and internal band additionally to the associat­ed head and reinforcement areas and being also susceptible to bear a flap for sign markings.

Figure 8 is illustrating how the bag is made without internal bands and with the associated head and reinforcement areas.

Figures 9 and 10 are elevation projections and figures 11 and 12 are plan projections of the machine's characteristic mechanisms, in association with each of the figures illustrating frontal pro­jections of the own machine.

[0011] In the first eight figures, the types of netting bags respective­ly coming out have been shown at the side of the machine members. The members referenced with numbers in the drawings are associat­ed with the parts now illustrated.

[0012] The drums -1- and -2- are associated to bands of thermoweldable laminar material which after running on the rollers -3- and -4- in a convenient number, are following up respective ways until they come together at one and another side of the restricted area -5- of the netting bag -6- conventionally made up with a netting tube-7- arranged around a guiding cylinder body-8-.

[0013] The cutting and welding of the band parts of thermoweldable mate­rial,external and leaning against the area-5- of the netting bag is conventionally obtained with a movable arrangement comprising a carrying body-9- provided with thermoweldable edges-10-, a kni­fe-11- and some punches-12- designed for piercing the bands and the netting placed between.

[0014] It is also characteristic in accordance with figures 2,3,4,5,6,7 and 8, the system whereby the guiding at least of one of the bands of thermoweldable material is being originated as also the band dragging until delivery to the cutting and welding area. Said arrangement as frontally shown in the figures 1 to 10, and in the plan view of the figures 11 and 12 comprises a rectangular shaped metal laminar component-13- horizontally arranged with a final edge-14- upwardly curved and associated with the entry por­tion of the band of thermoweldable material-15- and the opposing edge-16- curved in the opposite sense and associated with the band departure area, prior to band delivery to the cutting and welding area.

[0015] Underneath the component-13-there is also another metal laminar one, equally shaped and represented by number -17- in a manner that both members are defining a flattened space on which the band-15- is running.

[0016] The top metal sheet-13- exhibits a plurality of rectangular,paral­lel and equidistant openings through which go on some annular pro­jections referenced with number-18- associated to a transversal roller of horizontal shaft,the projection being applied on the top face of the band-15-, the band lower face leaning against the sur­face of the roller-19-, and the surface of the roller being cover­ed with a soft material or else carrying at least some annular areas of soft material in association with the annular projections of the roller-18-.In this manner is obtained the band-15- smooth traction without any possibility of sliding towards the machine central area,wherein the bags are shaped and the two bands of ther­moweldable material will then be cut and welded.

[0017] The movable knives-20- oppositely fitted are synchronized and placed near the remainder of the machine members for cutting the band of thermoweldable material.

[0018] It is a characteristic of the described machine the absense of suction cups or any other pneumatic members at the cutting and weld­ing area of the bands of thermoweldable material since said holding action during implementation of the operations cited is not at all necessary.

[0019] Another characteritsic of the new machine is the existence of the rods -21- and -22- horizontally arranged and with a possibility of rotation relative to the support-23-,these rods being guided by an intermediate support-24- automatically determining the sup­port opening or closing in accordance with the position of the ma­chine movable body-9a- when the closing happens at the implementa­tion of the cutting and welding operations of the bag and leaned bands. In this way, the smooth tubular netting restriction and its properly flattened shape is obtained prior to any performance of the former operations.

[0020] The machine can be completed using arrangements performing ancilla­ry operations for the major functions such as placing inside or outside any bags of two or more parallel ribbons with the simple purpose of advertising or make them aesthetic.

[0021] The ribbon length of thermoweldable material as a function of flap and handle at one and another side of the shaped bags is adjusted using the arrangement made up with the pneumatic cylinder-25- at each side of the machine,horizontally supported and having its cy­linder shaft perpendicular to the bag production travelling sense, by the support-26- fitted to the movable arm-27-sliding over the fixed guides towards the machine frame. The stem-28- of the cylin­der takes up a rack length-29- and a threaded length -30- at its end which allows to adjust using one or two nuts,the piston for­ward travel relative to an abutment member-31-.In this way, the rotation of the guiding roller-32- associated with the rack re­mains determined and thereby a rotation of the wheel -33- associat­ed to the roller train -18- and -19- which is causing the ribbon progress according to the different figures 1 to 8.

[0022] The examination of the mentioned figures allows to know how is shaped the flowing circuit of bands of thermoweldable material,ac­cording to the side shape of the finished bags,each one shown in a side view and in a profiled view near to the illustration of the machine and the ribbon circuit. Its use is also perceived in certain types of bags, provided with supplemental or additional paper,plastic bags and other material bags, inside or outside the bags,said bands if required, are obtained by drums-34- and-35- takeoff,according to figures 3 to 7, the bands being duly guided by roller sets and driven to the central area where they are runn­ing inwardly or outwardly as required on the netting tubular body which is shaping the bag. These bands are concurrently cut and welded with the bands of thermoweldable material making up the labelling and reinforcing areas of the bag's heads and bottoms, the same operations being performed as in the case of those for external bands.

[0023] The examination of the figures 1 to 8 allows to see how the side bands of thermoweldable material derived from the drums-1- and -2- are made,as might be required,to travel different runnings in accordance with the lengths wanted to be set up at the bag exter­nal face. When the existence of continuous areas of external band are required at the external portion of one or another side of the bags,according to figures 1,2 and 3,the bands of thermoweldable material are not running on between the guiding sheets-13-and -17-, but instead through the notches-36-and -37- transversally made in the plates-38- and -39- according to figures 11 and 12. The lat­est of these plates is provided with some expansions-40- determin­ing a central rectilinear area-41- which is being adapted to the lower portion of the netting tubular body-7- aiding in this way to the collection of netting at the bag producing phase.

[0024] The bags according to figure 1 are thus provided with two rectan­gularly shaped side laminar parts-42-fully wrapping the netting bag and its contents, the bags according to figure 2 have one of these laminar parts only in one of its external faces and the bags related to figure 3 have a laminar part of the cited type and ad­ditionally an internal band or laminar part provided by the drum -34- as has been previously explained.

[0025] The bags according to figure 4 are externally provided with two bands-44- and-45- supplied by the drums-34- and -35- and like as in the remainder of the cases, some rectangularly shaped reinforc­ing areas-46- and -47-forming up bag head and bottom.

[0026] The latest bag coming out from the performance of the active head -9-, is provided in all cases with two or more continuous or discon­tinuous welding lines-48-and-49- defined by the welding bands of that body and punch ing die-50- and -51- making up and shaping the holes for the passage of the fingers,the fixation of the bag com­ing out from the performance of punching dies of the body -9- and the top -52- and lower-53- cutting lines coming also from the cutt­ing members associated to that body is thus made much easier. At the lower portion of the bags shown in the figures 1,2 and 3, the welding line -54- puts together the external and side bands-­42- with the netting of container tubular body and the edge-55- is the outcome of the cutting as performed by the action of said body-9- which in turn is producing the head of the following bag (in the flowing sense of the netting tubular body-7-) located over it at the space made during the continuous processing of the bag manufacturing.

[0027] The flap-56- length according to figure 5, can be adjusted by go­verning the travelling active length of the rack-29- associated to one of the pneumatic cylinders -25- and optionally can be fix­ed over label -57- or else contain optional inscriptions and graphics.

[0028] In the case of fixing labels, as for instance at the flap-56- an ancillary arrangement can be used,not illustrated in the drawings, which might aid in the easy and smooth placing of labels without any wrinkles and based in the operation of a small pneumatic cy­linder as a treading member.

Claims

1.- A procedure for the continuous manufacturing of netting bags, an improved machine for the implementation of said procedure and the netting bags coming out therefrom, essentially characterized in that the procedure,being of the type using a netting tubular body which is being cut, and making up closed containers at the ends after filling, is provided with lateral feeding of bands of thermoweldable material for the concurrent application to the bag body at the external and/or internal portions,thereby being deter­mined in this way the optional existence of areas of those thermo­weldable materials running without any interruption in certain ca­ses from the head to the reinforced bottom of the produced bags, in other cases of restricted areas to the head and reinforced bottom of the bag and in other cases as a diversion of the head, the marking of inscriptions and signs at the holding flaps made therefrom and eventually using also signalling reception labels, the flowing circuit of the bands of thermoweldable material being performed inside and/or outside of the netting body in accordance with the configuration of the bands to be made by means of band dragging and shifting arrangements and band guiding means with fa­cilities for the length adjustment which allow to change the dimen­sions of the external flaps obtained.

2.- A procedure for the continuous manufacturing of netting bags and an improved machine for the implementation of said procedure, according to claim 1, characterized in that the guiding of bands of thermoweldable materialmaking up the external areas going to the bags is obtained as required in certain cases with the aid of parallel guides or a pair of parallel metal sheets placed below the cited guides horizontally arranged with the edges associat­ed to one of the sides shaped like a curve for the reception of the flowing bands and the edges associated to the other side also shaped like a curve to define a controlled outlet of the flowing bands,the band dragging being obtained by means of a pair of con­ducting rollers,one of which is showing its surface with a plura­ lity of annular projections of a low hardness material,while the other roller is showing a plurality of annular projections in association with the former ones, said rollers being interconnect­ed with a series of rectangular openings arranged at equal distan­ces at the top guiding laminar part and being allowed in this way the tangency of the two conducting rollers,as exclusively in the areas determined for shifting bands of thermoweldable material, without any wrinkles and also excluding foreign matter,the drive of one of the conducting rollers obtained by means of a toothed wheel associated to a pinion driven by a free returning and advanc­ing alternatively moved rack mechanism determined by the stem of an adjustable length horizontally shaft fitted pneumatic cylinder.

3.- A procedure for the continuous manufacturing of netting bags and machine for the implementation of said procedure,according to claim 1, characterized in that a cutting arrangement of the bands of thermoweldable material is provided and made up with two hori­zontally actuated opposing movable knives,the arrangement being placed after and downwardly the driving and guiding areas of the bands at their entry into the machine body according to the re­quired lengths for the side flaps optionally shaped at the bag faces.

4.- A procedure for the continuous manufacturing of netting bags and machine for the implementation of said procedure according to claim 1, characterized in that the guiding of the bands of thermo­weldable material is set up in the arrangement of the laminar parts at all the faces of each shaped bag with a pair of horizontally arranged plates provided with respective notches for band passage, one of the laminar part at least being derived to a determinant pair of projections of a frontal rectilinear area aiding in the performance of each bag.

5.- A netting bag according to claim 1, characterized in that two side laminar parts of thermoweldable material are provided and they concurrently making up the bag reinforcing head and the bag reinforcing bottom and optionally according to the bag types, other bands can be located internal or externally and capable of putting together the bag reinforced head and bottom, setting up a flap or limiting them to the reinforced bottom and head.

6.- A netting bag according to claim 1, characterized in that at least one of its main faces is provided with a flap designed to hold inscriptions, bar codes printed thereon and if required a sig­nalling label,said flap being derived from one of the laminar parts forming the bag head and being set up by the cutting and welding together with the netting tubular body of the side bands of ther­moweldable material.

Drawing