Device for splicing a replacement paper strip to the active paper strip in a plastic bag roll wrapping station and procedure for performing such a splice

Abstract

The invention consists of a device and a procedure for preloading a second incoming roll (4) in a banding station while the active roll (3) is in use, such that when the end of the active roll (3) is detected, the incoming paper tape (17) is automatically spliced ​​to the active paper tape (22), remaining preloaded on the incoming roll (4) until the tape splicing is activated manually or automatically. Abstract figure: Figure 1

Description

Title of the invention: Device for splicing a replacement paper strip to the active paper strip in a plastic bag roll banding station and procedure for carrying out such splicing. technical field

[0001] The present invention relates to a device for automatically splicing the replacement gummed paper tape to the active gummed paper tape in a banding station which manufactures bands with which an immobilizing tape is applied to the rolls of bags produced on a plastic bag roll manufacturing machine.

[0002] Another aspect of the invention relates to a method for automatically splicing one strip of gummed paper to another strip of gummed paper in a plastic bag roll wrapping station forming part of a bag roll manufacturing machine. EARLIER ART

[0003] Once rolled up, the rolls of plastic bags have no means of preventing the roll from unwinding; it is necessary to immobilize them by means of a band consisting of a strip of paper, cut from a strip of gummed paper, which wraps around the roll of bags and adheres to it and to itself.

[0004] The banding operation is carried out in a station which is part of or integrated into the bag-making machine.

[0005] The active gummed paper strip must be replaced with a new strip when it is finished, by splicing the incoming paper strip with the active paper strip.

[0006] In the current state of the art, the machine operator must control the amount of gummed paper remaining on the active reel and, when a certain part of the paper strip remains on the active reel, splice the end end of the active reel to the initial end of the replacement reel.

[0007] Currently, splicing is performed manually according to the following procedure:

[0008] With the banding station stopped, the operator cuts the paper strip from the active reel and removes it from the reel holder, then inserts the replacement reel.

[0009] When paper strips are printed with a reference mark to synchronize the strips, the operator must locate one of the reference marks printed on the paper strip and cut it at that point. The registration mark is then placed at the end of the replacement reel's tape.

[0010] Next, the end of the paper strip from the replacement reel is glued with adhesive tape, onto a reference mark of the active paper strip in the machine.

[0011] After splicing, the operator will restart the banding station so that the paper web with the new splice roll advances through the banding station to the winding station, where the operator will manually discard the roll of bags containing the band with the splice. The system is then ready for another banding operation.

[0012] This technique has drawbacks which have not been resolved, as there are no known procedures or devices capable of carrying out this operation in an automated or more efficient manner.

[0013] When the operator stops the banding station to incorporate a new roll, productivity decreases because the banded rolls are no longer produced and a certain number of rolls will inevitably be lost, depending on the operator's skill.

[0014] If the splicing is not carried out correctly, there will be a loss of register, which will result in a defective production which will have to be scrapped.

[0015] When the paper roll runs out without the operator noticing, the machine continues to produce rolls of bags, but without a band and the entire production must be discarded.

[0016] In addition, it will be necessary to introduce the new paper strip into the banding station, by manually passing all the material into the banding station.

[0017] The operator's concentration is crucial in determining when to stop the strapping station to replace the reel. Therefore, a simple lack of operator attention results in significant production losses; it would thus be beneficial to develop a device and a new splicing procedure that minimizes operator intervention and performs strapping more quickly without requiring the strapping station to be stopped. PRESENTATION OF THE INVENTION

[0018] The present invention solves the objective problems described in the preceding section and relates to a device capable of automatically splicing the initial end of an incoming gummed paper strip to the final end of the active gummed paper strip in a plastic bag wrapping station without the need to stop the wrapping station or require operator intervention. This means an increase in production since rolls of wrapped bags continue to be produced during the splicing process and there is no waste inherent in stopping and starting the banding station.

[0019] Another aspect of the invention relates to a method for splicing one strip of gummed paper to another strip of gummed paper in a plastic bag wrapping station forming part of a bag roll manufacturing machine, without it being necessary to stop the wrapping station and without the operator controlling the machine having to continuously monitor the system.

[0020] According to the first aspect of the invention, the new device for splicing an incoming paper strip to the active paper strip in a plastic bag wrapping station comprises a frame coupled to or integrated with the plastic bag roll manufacturing machine, on which are located two reel holders with a braking system into which are inserted the active reel with which the bands are being made at that time and an incoming reel to which the paper strip is to be spliced. Between the two reel holders is a guide along which moves a two-pronged rod that allows the reels to be centered and aligned.

[0021] On the same frame, above the reels, are two knives and two splicing arms mounted on shafts that allow them to be aligned horizontally or parallel vertically. The active paper web and the incoming paper web pass between the splicing arms.

[0022] The active paper tape and the replacement or incoming tape pass from its corresponding reel to the splicing arms through a system of guide rollers, two knives and two compensation rollers, the latter also being used as end-of-reel detectors.

[0023] Each splicing arm is assisted by an L-shaped push plate that pivots on the associated arm, inserting the short part of the push plate into a rectangular space provided in each splicing arm. With this movement, the push plate inserts a fold of the incoming paper strip into the rectangular space of the splicing arm, where retention means are provided to immobilize the fold of the paper strip.

[0024] Under one of the push plates is a photoelectric cell, which has the function of detecting splice breaks or paper breaks, and which is only operational when the push plates are raised.

[0025] To facilitate cutting the paper strip, each splicing arm has a cutting groove with a set of stops distributed along the length of the groove.

[0026] Each splicing arm has, between the cutting groove and the rectangular space, a flat bearing surface on which the paper strip is placed and on which the adhesive tape is applied.

[0027] A second aspect of the invention relates to a splicing procedure for the strip of incoming paper and active paper strip in a plastic bag roll wrapping station, in which a manual pre-loading stage of an incoming roll and a second phase of splicing and loading a new gummed paper strip are distinguished.

[0028] During the first step of the procedure, an operator manually prepares an incoming paper roll so that its tape can be attached to the paper tape of the active roll.

[0029] In the second step of the procedure, the pre-loaded reel tape is automatically spliced ​​to the end of the paper tape in use and the tape containing the splice is discarded, leaving the paper tape from the pre-loaded reel in use.

[0030] During the manual pre-charge step of the procedure, the following maneuvers are performed:

[0031] 1st insertion of the incoming coil: The incoming coil is inserted into the free shaft of the coil holder.

[0032] 2nd coil alignment: the incoming coil is aligned with the active coil.

[0033] 3rd fixing of the incoming paper strip: the paper strip coming from the The incoming reel is conveyed by guide rollers to the splicing arms, where the end is fixed at two points to one of the splicing arms.

[0034] 4th application of adhesive tape: a double-sided adhesive tape is applied to the end of the strip attached to the splicing arm and a partial cut is made in this.

[0035] After this first step, the procedure is suspended until the roll of paper in use is exhausted.

[0036] Since the operator only takes a few minutes to perform the manual pre-charge and can do so at any time while the active coil is running, he has plenty of time to perform the operation and can relax his vigilance with regard to this device.

[0037] When the coil in use is exhausted, the procedure is reactivated with the second phase of the procedure during which the following maneuvers are performed:

[0038] 5th detection of the end of the active coil: when the end of the active coil is detected, the procedure resumes.

[0039] 6th splicing of the strips: The two splicing arms rotate on their shafts until they are positioned parallel to each other. This movement is performed while the bag rolls are being wound and the strapping strip is stationary. Thus, the end of the incoming reel attached to the loaded splicing arm pivots over the end of the active reel, which is supported by the splicing arm. free, which causes the adhesive tape attached to the initial end of the incoming reel to adhere to the end of the active reel and the splice is established.

[0040] 7th. Insertion of the incoming tape: When the paper tape is moving again, the end end of the active tape pulls the initial end of the incoming roll, and simultaneously, the splicing arms separate. The portion of the incoming roll located between the end and the point where the adhesive tape was attached is torn by the partial cut and remains attached to the splicing arm, from where it will be manually removed by the operator during the next cycle. When the splicing arms are extended, the retention means release the fold of the incoming tape. At the same time, the excess of the active tape is cut, and the active paper tape pulls the incoming tape, inserting it into the banding station.

[0041] 8th Banner Elimination with Splicing: When the section of tape containing the splice arrives at the knife that cuts the banners, it is automatically cut and eliminated as defective, and the incoming reel becomes the active reel from which the banners are cut.

[0042] From this moment, the operator can start a new cycle by repeating the steps described in the first part of the procedure, with the difference that the end of the incoming reel will now be attached to the splicing arm opposite to that used in the previous cycle.

[0043] As the second phase of the procedure is automatically activated when the system detects that the reel in use is exhausted, the new procedure relieves the operator of the splicing maneuver and the disposal of the spliced ​​reel, all maneuvers, including manual maneuvers, being carried out with the machine and the banding station running while the bag rolls are rewound, so that production is not interrupted. PRESENTATION OF THE FIGURES

[0044] 1- Building

[0045] 2- Spool holder

[0046] 3- Active coil

[0047] 4- Incoming coil

[0048] 5- Guide

[0049] 6- Two-branch stem

[0050] 7- Button

[0051] 8-Splicing arm

[0052] 9- Pivot shafts

[0053] 10-Guide rollers

[0054] 11-Compensating rollers

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[0086] 12-Thrust plate 13-Photoelectric cell 14-Paper strip fold 15-Rectangular space 16-Means of retention 17-Incoming paper strip 18-Cutting groove 19-Cutting stops 20-Supporting surface 21- Adhesive tape 22-Active paper strip 23-Preloading Stage 24-Splicing and Loading Stage 25-Inserting the coil 26-Coil alignment 27-Securing the paper strip 28-Magnet 29-Application of adhesive tape 30-Partial cutting of the strip 31-Active coil end detection 32-Splicing of the strips 33-Inserting the incoming tape 34-Removal of the banner with splicing 35-Cutter 36-End of the incoming band 37-Knives To supplement the description and to help better understand the features of the invention, a set of drawings is attached as an integral part of said description, in which the following is shown in an illustrative and non-limiting manner. Figure [1] shows a general diagram of the paper tape splicing device. Figure [Fig. 2] shows a diagram of the splicing arm assembly in the preparation phase. Figure [Fig. 3] shows a diagram of the prepared splicing arm assembly. Figure 4 shows a diagram of the splicing arm assembly in the splicing phase. Figure 5 shows a diagram of the splicing arm assembly at the splice end.

[0087] Figure 6 shows a plan view of the extended splicing arms.

[0088] Fig. 7 shows a view of the coils in their supports.

[0089] [Fig.8] - This is a sketch representing the procedure for splicing paper strips according to the invention. DETAILED DESCRIPTION OF THE INVENTION

[0090] The invention consists of preloading a second incoming reel (4) in the tape-reeler during the use of the active reel (3), so that when the end of the reel in use is detected, the end of the incoming reel is automatically spliced ​​to the tape of the outgoing reel, the incoming reel (4) remaining preloaded until the moment when the tape splicing is activated manually or automatically.

[0091] In this way, the operator can pre-charge as soon as the new coil is put into service, and can intervene as long as the active coil lasts.

[0092] The splicing of the new strip is done automatically without stopping the machine and using the paper roll to the end.

[0093] At the same time, the banner is eliminated with splicing and is done automatically and without loss of recording.

[0094] According to the illustrated example, the new device for splicing a replacement paper strip to the active paper strip in a plastic bag wrapping station consists of a frame (1) arranged vertically, in the middle of which are two reel holders (2) with braking means.

[0095] The active coil (3) is placed in one of the coil holders and the incoming coil (4), which must be connected to the active coil (3), is inserted into the next coil holder.

[0096] Between the spool holders (2) is a guide (5) along which moves a two-pronged rod (6) whose position is fixed by means of a button (7).

[0097] The upper part of the frame (1) is equipped with two splicing arms (8) mounted on two pivoting shafts (9).

[0098] To guide the tape from each reel towards the splicing arms (8), guide rollers (10) are provided in combination with two compensation rollers (11).

[0099] The compensating rollers (11) have the ability to move vertically to keep the strips under tension and, at the same time, to serve as end-of-roll detectors when they fall into their lowest position.

[0100] The knives (37) cut the active strip as soon as the splicing arms (8) are deployed.

[0101] Next to each splicing arm (8) is a push plate (12) with an "L" cross-section which inserts a fold of paper strip (14) into a rectangular space (15) located inside each splicing arm (8).

[0102] One of the push plates includes a photoelectric cell (13) which detects the breakage of the splice or the paper.

[0103] In each of the rectangular spaces (15) are means for retaining (16) the incoming paper strip (17).

[0104] Each splicing arm (8) has a cutting groove (18) with three stops (19), one fixed in the center of the groove and the other two adjustable at the ends.

[0105] Between the cutting groove (18) and the rectangular space (15), there is a bearing surface (20) on which the incoming paper strip (17) is placed and on which an adhesive tape (21) is applied.

[0106] Another aspect of the invention relates to a splicing procedure of the incoming paper strip (17) and the active paper strip (22) in a plastic bag roll band-derolling station.

[0107] The new procedure is divided into a manual preloading step (23) of an incoming reel and a splicing and loading step (24) of a new strip of gummed paper.

[0108] The manual preloading step (23) includes the following maneuvers:

[0109] 1st insertion of the incoming coil (25): the incoming coil (4) is inserted into the free coil holder (2), because the adjacent holder is occupied by the active coil (3).

[0110] 2nd Alignment of the coils (26), where the incoming coil (4) is aligned with the active coil (3) using the two-pronged rod (6).

[0111] 3rd Fixing of the incoming paper strip (27), where the end of the incoming paper strip (17) passes manually through the guide rollers (10), the knife (37) and the compensation roller (11) until it reaches the splicing arm (8), where it is fixed at two points.

[0112] The first, at the end of the arm, where the tape is held in place by a magnet (28), and the second, by a retention means (16). To achieve this, the push plate (12) associated with the splicing arm descends and forces a portion of the incoming paper tape (17) into the rectangular space (15), creating the fold in the paper tape (14), which is held in place by the retention means (16). The push plate (12) is then withdrawn, and the end of the incoming paper tape is held firmly against the bearing surface (20) of the splicing arm (8).

[0113] 4th Application of double-sided adhesive tape (29) to the end of the strip that is attached to the splicing arm (8) and once the adhesive has been applied, a partial cut is made in the strip (30) using a cutter (35), which slides inside the cutting groove (18). This cut is stopped when the cutter (35) reaches the stops (19), leaving between one and three splice points on the strip.

[0114] At the end of the manual preloading step (23), the procedure is suspended until the roll of paper used (3) is exhausted.

[0115] After the preloading step (23), the splicing and loading step (24) begins, during which the following maneuvers are carried out:

[0116] 5th Detection of the end of the active reel (31), which is carried out by means of the compensating roller (11) which, when the active paper strip (22) is finished, falls into its lowest position, which is detected by the system, for example with conventional means of position detection, which leads to the resumption of the procedure.

[0117] 6th splicing of the strips (32) where the two splicing arms (8) rotate on their shafts (9) until they are positioned parallel to each other. Through this movement, the end of the incoming strip (36) is folded against the active paper strip (22), the two being joined by an adhesive tape (21) which is positioned on the bearing surface (20) of the splicing arms (8), providing the necessary pressure for it to adhere to the active paper strip (22). This movement is performed while the bag rolls are being wound and the wrapping strip is stationary.

[0118] 7th Insertion of the incoming tape (33) where the splicing arms (8) are again deployed, causing the end of the incoming tape (36) to separate from the incoming tape (17) by tearing the splice points present in the partial cut of the tape (30). This tearing occurs because the end of the incoming tape (36) is held by the magnet (28) in the splicing arm (8) while the rest of the incoming paper tape (17) remains firmly attached by the adhesive tape (21) to the active paper tape (22). At the same time as the splicing arms (8) are deployed, the retention means (16) release the fold (14) of the incoming tape (17), the knife (37) cuts the excess of the active tape (22) which then advances again carrying the incoming tape (17) inserting it into the banding station.

[0119] 8th Banner Removal with Splicing (34). The incoming paper web (17) continues to be pulled by the active paper web (22) until it reaches the point in the machine where a knife cuts the banners, so that the section of the web containing the splice is cut and automatically removed as defective, and the incoming reel becomes the active reel from which the banners are sectioned, thus concluding the cycle of the new procedure.

Claims

Demands

1. A device for splicing a replacement paper strip to the active paper strip in a plastic bag roll wrapping station, comprising a frame (1) fixed to or integrated into the bag roll manufacturing machine, characterized essentially in that it comprises: - Two reel holders (2) with braking means, one of which contains the active reel (3) and the other the incoming reel (4) to be spliced ​​to the active reel (3). - A guide (5) along which a two-pronged rod (6) located between the reel holders (2) moves. - Two knives (37) that cut the protruding strip. - Two splicing arms (8) mounted on two pivoting shafts (9), which have: o A rectangular space (15) with retention means (16) for the incoming paper strip (17). o A cutting groove (18) with one or more stops (19) distributed along the cutting groove (18). o A support surface (20) on which the incoming paper strip (17) rests.- Guide rollers (10) and two compensation rollers (11) that guide the web from each reel to the splicing arms (8). The compensation rollers also detect the end of the reel. - Two push plates (12) with an "L" cross-section, which pivot above the splicing arms (8) to insert their shorter section into the rectangular space (15) in the splicing arms (8). - A photoelectric cell (13) that detects breakage in the splice or the paper.

2. A procedure for splicing a replacement paper tape to the active paper tape in a plastic bag roll wrapping station, characterized essentially in that it comprises two steps: - A manual preloading step (23) of an incoming reel (4) in which the following operations are performed: o 1st insertion of the incoming reel (25) where the incoming reel (4) is inserted into the free reel holder (2) next to the one occupied by the

3. active coil (3). o 2nd Alignment of the reels (26) where the incoming reel (4) is aligned with the active reel (3) by means of a two-pronged rod (6) which moves for a guide (5) located between the reel holders (2). o 3rd Securing of the incoming paper web (27), where the end of the incoming paper web (17) passes manually through the guide rollers (10) and the compensation roller (11) until it reaches the splicing arm (8), where it is secured at two points to the support surface (20). o 4th Apply double-sided adhesive tape (29) to the end of the strip which is attached to the splicing arm (8) and make a partial cut of the strip (30) using a cutter (35), which slides inside the cutting groove (18) to the stops (19), leaving one or more points of union on the strip. - A splicing and loading stage (24) during which the following maneuvers are carried out: o 5th Detection of the end of the active reel (31) by means of a compensating roller (11) which, when the active paper strip (22) is finished, descends to its lowest position, which restarts the procedure. o 6th splicing of the strips (32) where the two splicing arms (8) rotate on their shafts (9), bending the end of the incoming paper strip (17) against the active paper strip (22) and are secured by the adhesive tape (21) positioned on the bearing surface (20) of the splicing arms (8). o 7th Insertion of the incoming tape (33) where the splicing arms (8) extend again, tearing the end of the incoming tape (36) by the partial cut of the tape (30) and at the same time, the active paper tape (22) drives the incoming tape (17) by inserting it into the banding station. o 8th Banner Removal with Splicing (34) where the incoming paper strip (17), driven by the active paper strip (22), reaches the knife which cuts the banners, which cuts the section of strip containing the splice and which is removed, then the incoming reel becomes the active reel from which the banners are sectioned, which concludes the cycle. Procedure according to claim 2, characterized in that to fix the incoming paper strip (17) at two points to the support surface (20), the end of the incoming paper strip (36) is fixed to the end of the splicing arm (8) by a magnet (28) and by the push plate (12) associated with the splicing arm, a part of the incoming paper strip (17) is forced into the rectangular space (15), creating a fold in the paper strip (14) which is immobilized by the retention means (16).

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