JP2015074507A - Tying device and tying method of tubular film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tying device and a tying method capable of improving reliability of a portion where a new inflation film is tied to an inflation film supplied to a continuous production machine of a film packaging bag.SOLUTION: A tying device includes a group of mechanisms for tying a first film 1A and a second film 1B in a conveyance path for sending the first film 1A or the second film 1B vertically upward from a film supply part 2. Specifically, a first film fixing mechanism 4, a vertical cut mechanism 5, a deposition mechanism 6, a horizontal cut mechanism 7, a film opening mechanism 8, and a second film fixing mechanism 9 are installed in a film feeding direction in this order from the film supply part 2.

Description

  The present invention relates to a film joining device provided in a packaging machine for forming a film packaging bag using an inflation film, and a method for joining the films. In addition, an inflation film refers to the film which folded the tube-shaped film manufactured by the inflation method flatly so that inner side surfaces might contact | adhere.

  2. Description of the Related Art Conventionally, vertical filling and packaging machines that manufacture packaging bags filled with liquid or paste-like contents are known. In this packaging machine, a tubular film suspended in the longitudinal direction (vertical direction) is thermally welded across the entire lateral direction of the film by a lateral sealing mechanism, and the contents are put into the film, and then the film Is sent at a constant pitch in the vertical direction, and the transverse sealing mechanism is used for heat welding in the entire horizontal direction, thereby producing a package portion in which the contents are enclosed. This packaging part is made continuously, but after the film is heat-sealed by the transverse seal mechanism, the packaging part is separated into one bag by cutting the film in the transverse direction at the heat-sealed part. Thus, a packaging bag with contents can be obtained.

  In this type of vertical filling and packaging machine, a sheet-like film is often used as a packaging material, and the sheet-like film is often formed into a cylindrical film in the course of feeding. However, it has also been proposed to supply a film formed in a cylindrical shape as a packaging material from the beginning like the vertical filling and packaging machine disclosed in Patent Documents 1 and 2.

  The vertical filling and packaging machine disclosed in Patent Documents 1 and 2 is formed by cutting one side edge of a tube-like film folded into a flat shape called an inflation film in its longitudinal direction, and opening the opening of the film. The nozzle is inserted inside the film so that the contents can be filled. And after the nozzle is sandwiched between the film mating surfaces in the opening below the nozzle and the opening is heat-sealed, the contents are put into the film, and the film is placed on both sides of the stopper. The package bag with contents is manufactured by heat-sealing in the width direction.

  The inflation film is formed into a tube-like film at a high temperature and immediately pressed into a flat shape so that the inner side surfaces are in close contact with each other, so that the inside of the film is extremely clean. For this reason, it is suitable when the contents of the packaging bag are food or beverage.

  By the way, in the continuous production of film packaging bags, when there is no film roll, it is generally replaced with a new film roll. At this time, if a new roll of film is set after the film used in the packaging machine runs out, the film must be set again from the beginning. As a result, the operating rate of the packaging machine decreases, and the production efficiency of the film packaging bag cannot be increased. For this reason, before the film used in the packaging machine disappears, a new film is joined to the film in the film supply unit.

JP 2003-81207 A JP 2004-210382 A

  If the packaging material is a sheet-like film, the joining of such films can be performed by superimposing the leading end of a new film on the end of the remaining film. However, when the packaging material is an inflation film, it is necessary to cut one side edge of the film along the longitudinal direction of the film as in the vertical filling and packaging machine disclosed in Patent Documents 1 and 2. For this reason, in the method of simply overlapping the end of the preceding film and the tip of the new film as in the case of the sheet-like film, it is not possible to form an opening in the new film.

  It was not easy to mechanize the work of connecting the inflation films in the film supply section. Therefore, before the first film (first film) used in the packaging machine disappears, an operator can preliminarily set one side edge of the tip of a new film (second film) at the film supply unit. A method has been used in which the first film and the second film are fixed with a tape or the like by inserting the end portion of the first film into the cut second film portion.

  However, in the method in which the operator connects the films to each other, there is a possibility that the connecting portion may come off due to the tension applied to the film being conveyed unless the tape is used well. In other words, there was a problem in the reliability of the connecting portion. Moreover, the operation | work which connects films using a tape was troublesome for the operator. For this reason, the applicant has intensively studied a method and an apparatus that can automate the joining of the inflation films.

  An object of the present invention is to provide a splicing device and a splicing method capable of improving the reliability of a portion where a new blown film is joined to a blown film to be supplied to a continuous production machine for film packaging bags in view of the above situation. .

  One aspect of the present invention relates to an apparatus for connecting a new tubular film to a tubular film composed of a front surface film and a back surface film in which inner side surfaces are in close contact with each other.

  Such a film joining apparatus includes a vertical cut mechanism, a horizontal cut mechanism, a film opening mechanism, two moving units, and a welding mechanism.

  The vertical cutting mechanism has two cutting blades that can enter the film conveyance path from the outside of the film conveyance path for feeding the film. The two cutting blades are arranged to face each other in the vicinity of both ends in the width direction of the film.

  The horizontal cut mechanism is arranged on the downstream side in the transport direction of the film with respect to the vertical cut mechanism. The horizontal cut mechanism cuts the film across the entire width direction of the film so as to cross two vertical cuts of the film formed in the longitudinal direction of the film by the two cutting blades of the vertical cut mechanism, and the preceding film and the subsequent film. Divide into films.

  The film opening mechanism is arranged on the downstream side in the transport direction of the film with respect to the lateral cut mechanism. The film opening mechanism includes a front side film and a back side film of a quadrangular portion defined by an edge of a preceding film side of a preceding film made by a transverse cutting mechanism and two longitudinal cuts. Open and hold outside.

  One of the two moving units moves the subsequent film created by the horizontal cut mechanism to the outside of the film transport path, and the other transports a new film from the outside of the film transport path rather than the film opening mechanism of the film transport path. Move it upstream in the direction. In the other moving unit, a new film can be held in a state where the front side film and the back side film at the leading end are cut out to the outside of the new film.

  The welding mechanism is a preceding film in which the front-side film and the back-side film at the leading end of the new film attached to the other moving unit are held open in the film opening mechanism. Are welded to the front side film and the back side film, respectively.

  Moreover, the other aspect of this invention concerns on the method of connecting a new tube-like film to the tube-like film which consists of the front surface film and back surface side film which inner surfaces contact | adhered closely.

This film joining method includes the following steps:
For the film being transported along the film transport path, a longitudinal cutting step for forming two longitudinal cuts in the longitudinal direction of the film in the vicinity of both ends in the width direction of the film;
The conveyance of the film is stopped, the film is cut across the entire width direction of the film so as to cross two longitudinal cuts formed in the longitudinal direction of the film by the longitudinal cutting process, and the film is divided into a preceding film and a succeeding film. Cutting process;
The front side film and the back side film of the quadrangular portion defined by the side edge of the subsequent film and the two vertical cuts of the preceding film made by the horizontal cutting process are opened and held outside the preceding film. A film opening process to perform,
A preparation step of preparing a mechanism that cuts and holds the front side film and the back side film of the leading end of the new film to the outside of the new film;
The succeeding film produced by the transverse cutting process is retracted from the film transport path, and the mechanism is disposed in the film transport path, and the front side film and the back side of the new film held in an open state A film moving step for causing the film to face the front side film and the back side film of the quadrangular portion of the preceding film held in an open state,
Welding for welding the front side film and the back side film of the new film held in the open state to the front side film and the back side film of the square part of the preceding film held in the open state, respectively. Process,
including.

  According to the invention of each aspect described above, two longitudinal cuts are formed in the longitudinal direction of the film by inserting a cutting blade in the vicinity of each side end on both sides in the width direction of the film being conveyed. Thereafter, the conveyance of the film is stopped, the film is cut across the entire width direction of the film so as to cross the two longitudinal cuts, and divided into a preceding film and a subsequent film. As a result, the leading film has a rectangular portion defined by the side edge of the succeeding film and two vertical cuts.

  By opening the front-side film and the back-side film of the rectangular portion to the outside of the preceding film, the leading film can easily be joined to the leading end of the new film.

  Also for the new film, the front side film and the back side film at the leading end of the new film are held in the mechanism in a state of being cut out to the outside of the new film. Retract the following film, and open the front side film and the back side film of the new film held in this mechanism in the open state, the front side of the square part of the preceding film held in the open state Relative to the film and the backside film. This makes it possible to weld them simply by moving the mechanism straight in the longitudinal direction of the film. In addition, since the flat surfaces are welded to each other, a firm connection can be obtained as compared with the case of using a tape, and the reliability of the connection portion can be improved.

  Therefore, according to this invention, the reliability of the part which connected the new inflation film to the inflation film used for the continuous production machine of a film packaging bag can be improved.

The front view which shows schematic structure of the connection apparatus of an inflation film by one Embodiment of this invention. It is the film top view and film side view which show the state of the film corresponding to operation | movement of the vertical cut mechanism of the joining apparatus of FIG. 1, and a horizontal cut mechanism. It is the film top view and film side view which show the state of the film corresponding to operation | movement of the film opening mechanism and welding mechanism of the joining apparatus of FIG. It is an operation | movement figure which shows a mode that a new film is connected with the first film with the connection apparatus of FIG. It is an operation | movement figure (continuation of FIG. 4) which shows a mode that a new film is connected to the first film with the connection apparatus of FIG.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a schematic configuration of an inflation film splicing device according to an embodiment of the present invention. FIG. 2 is a film plan view (a1 to c1) and a film side view (a2 to c2) showing the state of the film corresponding to the operation of the vertical cut mechanism and the horizontal cut mechanism of the splicing device of FIG. 3 is a film plan view (a1, b1) and a film side view (a2, b2) showing the state of the film corresponding to the operation of the film opening mechanism and the welding mechanism of the splicing device of FIG. FIG. 3 (a3) is a view of the film in the state of FIG. 3 (a2) as viewed from the upstream side in the film transport direction.

  The inflation film splicing device according to the present invention is configured in a film supply unit in a packaging machine that continuously produces film packaging bags as disclosed in, for example, Patent Documents 1 and 2.

  As shown in FIG. 1, the splicing device of this embodiment includes a film supply unit 2 that supplies the film 1, and can feed the film 1 from the film supply unit 2 vertically upward. The film 1 handled by this joining device is an inflation film, that is, a film that is formed into a tube shape by an inflation method and then folded into a flat shape so that the inner side surfaces immediately contact each other. The film 1 is wound in a roll shape so that the end in the longitudinal direction can be extended and sent out.

  The film supply unit 2 includes two support shafts 2a and 2b that rotatably support the film 1 (films 1A and 1B) wound in a roll shape around the core. The two support shafts 2a and 2b are installed substantially in parallel, and the first film 1A supported by the one support shaft 2a is drawn out through the plurality of guide rollers 3, and is in a state without meandering. It is supplied to a packaging machine (not shown). During this time, the second film 1B supported by the other support shaft 2b is set in a standby state.

  The splicing device has a mechanism group for connecting the first film 1A and the second film 1B to the transport path for sending the first film 1A or the second film 1B vertically upward from the film supply unit 2. . Specifically, the first film fixing mechanism 4, the longitudinal cutting mechanism 5, the welding mechanism 6, the lateral cutting mechanism 7, the film opening mechanism 8, and the second film along the film feeding direction from the film supply unit 2. The fixing mechanism 9 is installed in this order. In addition, in this embodiment, although the conveyance path | route of the film 1 was made into the substantially perpendicular direction, this invention is not limited to this direction.

  The first film fixing mechanism 4, the longitudinal cut mechanism 5, and the welding mechanism 6 are finished into one unit so that they can be moved together from the film transport path to another place. This unit is hereinafter referred to as a “moving unit”, and the apparatus of this embodiment includes two moving units U1 and U2.

  Each of the moving units U1 and U2 has a rotation fulcrum common to the film supply unit 2 as viewed from the mobile unit U1 and U2, and each of the movement units U1 and U2 is rotatable about the rotation fulcrum. It is possible to evacuate to another position, or to arrange in this conveyance path from this other position. For example, in FIG. 1, the first moving unit U <b> 1 is disposed in the film 1 conveyance path, and the second moving unit U <b> 2 is disposed in the first position (position in FIG. 1). In this case, the first moving unit U1 is positioned at the second position (the first position is symmetrical with respect to the film transport path), and the second moving unit U2 is positioned at the transport path of the film 1. The positions of the first and second mobile units are changed.

  The first film fixing mechanism 4 includes two plates 4a and 4b that are disposed to face each other across the transport path of the film 1. The two plates 4a and 4b are moved opposite to each other by a drive source (not shown), and the film 1 can be fixed by sandwiching the film 1 therebetween.

  The longitudinal cutting mechanism 5 is disposed above the first film fixing mechanism 4 (downstream in the feeding direction of the film 1). The vertical cutting mechanism 5 has two cutting blades for film cutting, and the two cutting blades can enter the conveyance path from the outside of the conveyance path of the film 1 by a driving source (not shown). It has become. Each cutting blade is attached with its cutting edge facing upstream with respect to the feeding direction of the film 1. Further, the two cutting blades are arranged to face each other at a position slightly away from the both ends in the width direction of the film 1 toward the center line side of the film 1. Therefore, when the two cutting blades are moved into the transport path of the film 1, the two cutting blades are slightly separated from each of the both ends in the widthwise direction of the film 1 toward the center line side of the film 1. With the feeding of 1, the film is cut along the longitudinal direction of the film (see FIGS. 2 (a1) and (a2)).

  The welding mechanism 6 includes two blocks 6a and 6b that are disposed to face each other across the conveyance path of the film 1. It is preferable that the block 6a extends over the entire width of the film 1 and the block 6b extends between the two cutting blades over the width of the film 1. Each of the blocks 6a and 6b is configured to move linearly toward the film opening mechanism 8 located on the downstream side of the welding mechanism 6 by a drive source (not shown). Heaters as heating means are built in the blocks 6a and 6b so that the end surfaces of the blocks 6a and 6b opposite to the first film fixing mechanism 4 side have a predetermined heating temperature.

  It is preferable that a holding means for detachably holding the end portion in the feed direction of the film 1 is provided on the side surface of each block 6a, 6b opposite to the conveyance path side of the film 1. Examples of the holding means include a clamp that presses and releases the end of the film 1 against the surfaces of the blocks 6a and 6b.

  The lateral cut mechanism 7 is disposed above the welding mechanism 6 (downstream in the feeding direction of the film 1). The horizontal cutting mechanism 7 has a cutting blade for cutting a film. The cutting blade has a shape extending in the width direction of the film 1 and is configured to cross the film 1 in the film conveyance path by a driving source (not shown) ((b2) in FIG. 2). , (C2)). Of course, the horizontal cut mechanism 7 is not limited to this configuration, and may be any configuration as long as the film 1 can be cut in the horizontal direction. For example, you may cut | disconnect the film 1 to a horizontal direction by moving a cutting blade to the horizontal direction of the film 1 in a film conveyance path | route.

  Since the film 1 is cut across the entire lateral width direction by the lateral cut mechanism 7, the film 1 is divided into two parts in the longitudinal direction into a preceding film 1-1 and a succeeding film 1-2 (see (c1) in FIG. 2). . The horizontal cutting mechanism 7 is driven when the cutting blades correspond to the positions of the two vertical cuttings 1a of the film 1 made in the longitudinal direction of the film by the two cutting blades of the vertical cutting mechanism 5 described above. As a result, in the preceding film 1-1 and the succeeding film 1-2, a rectangular portion 1c is defined by the edge 1b made by the horizontal cut and the two vertical cuts 1a (the shaded area in FIG. 2 (c1)). Section).

  The film opening mechanism 8 is disposed above the lateral cut mechanism 7 (downstream in the feeding direction of the film 1). The film opening mechanism 8 has two blocks 8a and 8b that are opposed to each other across the transport path of the film 1. It is preferable that the block 8a is disposed corresponding to the entire width direction of the preceding film 1-1, and the block 8b is disposed so as to face at least the quadrangular portion 1c of the preceding film 1-1.

  A suction mechanism (for example, a number of suction holes connected to a negative pressure generating source) capable of sucking the outer surface of the preceding film 1-1 is provided on the surface of each block 8a, 8b on the side of the film 1 conveyance path. ing. It is preferable that the block 8a extends over the width direction of the film 1 so that the whole surface including the square part 1c on the front surface side of the preceding film 1-1 can be adsorbed. On the other hand, the block 8b extends over the width direction of the film 1 to the same length as the width of the quadrangular portion 1c so that only the quadrangular portion 1c on the back surface side of the preceding film 1-1 can be adsorbed. Is preferred.

  Further, each of the blocks 8a and 8b has a rotation fulcrum at the end on the downstream side in the film transport direction, and each of the blocks 8a and 8b can be rotated around the rotation fulcrum by a rotation driving device (for example, a motor). This rotation fulcrum is a rotation axis extending in a direction substantially parallel to the width direction of the film 1 being conveyed. The rotary drive device for the first block 8a rotates the first block 8a clockwise by 90 degrees, and the surface of the first block 8a on the side of the transport path of the film 1 is transported. It can be arranged in a substantially horizontal state from the place facing the route. The rotary drive device for the second block 8b rotates the second block 8b by 90 degrees counterclockwise, and the surface of the second block 8b on the side of the transport path of the film 1 It can be arranged in a substantially horizontal state from the position facing the conveyance path.

  According to the film opening mechanism 8, when the entire surface including the rectangular portion 1c on the front surface side of the preceding film 1-1 is attracted to the first block 8a, the block 8a is rotated 90 degrees clockwise. At the same time, it is possible to adsorb only the square part 1c on the back side of the preceding film 1-1 to the second block 8b and rotate the block 8b by 90 degrees counterclockwise (see (a3) in FIG. 3). ). By such an operation, the front side film and the back side film of the quadrangular portion 1c are opened to the outside of the preceding film 1-1, and the inner side surface of the front side film and the inner side surface of the back side film are substantially the same. Leveled.

  The second film fixing mechanism 9 is disposed above the film opening mechanism 8 (on the downstream side in the feeding direction of the film 1). Similar to the first film fixing mechanism 4, the second film fixing mechanism 9 includes two plates 9 a and 9 b that are disposed to face each other across the conveyance path of the film 1. The two plates 9a and 9b are opposed to each other by a drive source (not shown), and the film 1 can be fixed by sandwiching the film 1 therebetween.

[Film joining method]
Next, mainly with reference to FIGS. 4 to 5, a process of connecting the inflation films using the connecting device of this embodiment will be described. FIG. 4 is an operation diagram showing how a new film is connected to the first film by the connecting device of FIG. FIG. 5 shows the continuation of the state shown in FIG.

  When the film 1 is formed into a film packaging bag by a packaging machine (not shown), as shown in FIG. 4 (a), the first film 1A held in a roll shape in the film supply unit 2 is fed out, It is sent to the upper part of the packaging machine through the film transport path in the vertical direction. At this time, the first moving unit U1 is disposed in the film transport path.

  A plurality of guide rollers 3 are arranged so that the first film 1A passes through the film conveyance path. Further, the feeding of the film 1 (first film 1A) is temporarily stopped when the vertical cutting mechanism 5, the horizontal cutting mechanism 7, the film opening mechanism 8, and the welding mechanism 6 are operated. It is preferable to use an accumulator that absorbs fluctuations in tension applied to the film 2 during feeding, a guide mechanism that corrects meandering of the film 2 and stabilizes the feeding direction, and the like.

  Thus, while continuing to send the first film 1 </ b> A to a packaging machine (not shown), the operator holds the roll-shaped film 1 </ b> B on the support shaft 2 b of the film supply unit 2.

  Next, as shown in FIG. 4B, the worker passes the second film 1 </ b> B between the plates of the film fixing mechanism 4 and between the blocks of the welding mechanism 6 in the second moving unit U <b> 2. Then, the end on the leading side of the second film 1B that has passed between the plates and between the blocks is cut to a predetermined length along the ridgelines of both side edges of the film. Thereby, the edge part of the head side of the film 1B is divided into two film pieces (a front surface side film and a back surface side film). Then, the operator turns one film piece 1Ba over the outer surface of one block 6a of the welding mechanism 6 and turns it over, and holds the tip of the one film piece 1Ba on the outer surface of the block 6a, such as a clamp. Secure by means. Similarly, the other film piece 1Ba is turned over over the outer surface of the other block 6b of the welding mechanism 6, and the tip of the other film piece 1Ba is held on the outer surface of the block 6b by a clamp or the like. It fixes with a means (refer (b2) of FIG. 3). In this way, the operator sets the second film 1B in the second moving unit U2 while there is still a large amount of the first film 1A.

  When the first film 1A is consumed by a packaging machine (not shown) and the control device (not shown) of the splicing device determines that the remaining amount of the film has become a predetermined amount or less, the vertical cutting mechanism 5 is activated. The determination may be made by providing an end mark at a location away from the rearmost end of the first film 1A by a predetermined distance in the length direction of the film, and detecting this.

  The operation of the vertical cutting mechanism 5 causes the two cutting blades to enter the film 1 conveyance path. As a result, the two cut blades are cut along the film longitudinal direction along with the feeding of the film 1 at a position slightly separated from each of the both ends in the width direction of the film 1 toward the center line side of the film 1. (See (a1) and (a2) in FIG. 2). When a given operation time of the vertical cutting mechanism 5 is finished, the two cutting blades are retracted from the film 1 conveyance path. For this reason, the length of the vertical cut is determined by the operating time of the vertical cut mechanism 5.

  Subsequently, when the cutting blades of the horizontal cutting mechanism 7 face the positions of the two vertical cuttings 1a of the film 1 made in the film longitudinal direction by the two cutting blades of the vertical cutting mechanism 5, FIG. As shown in FIG. 4, the feeding of the film 1 is stopped, and the lateral cut mechanism 7 is activated. It is preferable to start the operation of the horizontal cut mechanism 7 by recognizing the presence or absence of the vertical cut 1a with a camera, an optical sensor or the like.

  By the operation of the horizontal cut mechanism 7, the film 1 is cut across the entire width direction so as to cross the two vertical cuts 1 a of the film 1. As a result, the film 1 is divided into a preceding film 1-1 and a succeeding film 1-2 with respect to the longitudinal direction (see (c1) in FIG. 2), and the preceding film 1-1 and the succeeding film 1-2 are laterally cut. A quadrangular portion 1c is defined by the edge 1b made by the horizontal cut of the mechanism 7 and the two vertical cuts 1a (see the shaded portion in (c1) of FIG. 2).

  Prior to the operation of the lateral cut mechanism 7, it is preferable to drive the first film fixing mechanism 4 and the second film fixing mechanism 9 to fix the film 1. Thereby, even if the film 1 is divided, the preceding film 1-1 and the succeeding film 1-2 are held by the second film fixing mechanism 9 and the first film fixing mechanism 4, respectively. Therefore, it is not necessary to drop the film from the film opening mechanism 7 or the moving unit U1 with an external force.

  Next, as shown in FIG. 5A, when the cutting blade of the lateral cutting mechanism 7 is retracted from the transport path of the film 1, the film opening mechanism 8 is activated. When the film opening mechanism 8 is operated, the entire surface including the rectangular portion 1c on the front surface side of the preceding film 1-1 is attracted to the first block 8a, and the block 8a is rotated 90 degrees clockwise. At the same time, only the rectangular portion 1c on the back side of the preceding film 1-1 is attracted to the second block 8b, and the block 8b is rotated 90 degrees counterclockwise (see (a2) and (a3) in FIG. 3). . Before this operation, the inner side surface of the front side film and the inner side surface of the back side film of the quadrangular portion 1c of the preceding film 1-1 were in close contact with each other. Both the side surface and the inner surface of the back side film are in a substantially horizontal state so as to form one flat surface.

  In parallel with the operation of the film opening mechanism 8, as shown in FIG. 5 (a), the second moving unit U2 is moved to the first position (FIG. 5 (a) by the two-dot chain line. Is moved to the transport path of the film 1. In relation to this, the first moving unit U1 is moved from the transport path of the film 1 to the second position (a position symmetrical to the first position with respect to the film transport path). Thereby, the 2nd film 1B is set to the conveyance path | route of the said film 1. FIG.

  Subsequently, as shown in FIG. 5B, the welding mechanism 6 in the second moving unit U2 is linearly moved toward the film opening mechanism 8 by a driving source (not shown). At this time, the film 1B is fed out from the film supply unit 2 in accordance with the movement amount of each of the blocks 6a and 6b.

  As a result of linearly moving the welding mechanism 6, the inner surface of the front side film and the inner side of the back side film of the rectangular portion 1 c of the preceding film 1-1 held in the film opening mechanism 8 in a substantially horizontal state. The inner side surfaces of the two film pieces 1Ba of the second film 1B fixed to the blocks 6a and 6b of the welding mechanism 6 are brought into contact with the side surfaces (see (b1) and (b2) in FIG. 3). During this contact, each block 6a, 6b is heated by a built-in heater. For this reason, the front side film piece 1ba and the back side film piece 1Ba of the second film 1B are welded to the front side film and the back side film of the quadrangular portion 1c of the preceding film 1-1, respectively. .

  Through the above process, the second film 1B is connected to the preceding film 1-1 remaining on the packaging machine side. Since substantially flat surfaces are welded to each other, a firm connection can be obtained as compared with the case of connecting using a tape, and the reliability of the connecting portion can be improved.

  Thereafter, as shown in FIG. 5C, the welding mechanism 6 in the second moving unit U <b> 2 moves backward with respect to the film opening mechanism 8. Each block 8a, 8b of the film opening mechanism 8 returns to the initial state where the surface that adsorbs the preceding film 1-1 is located at the position facing the transport path of the film 1, and suction of the outer surface of the preceding film 1-1 is performed. Is stopped. The second film fixing mechanism 9 is driven and the fixing of the preceding film 1-1 is released. Then, the feeding operation of the preceding film 1-1 succeeding the second film 1B is performed again. As a result, the second film 1B is unwound from the film supply unit 2, and is sent to a packaging machine (not shown) through the film transport path in the vertical direction.

  In addition, when each block 8a, 8b of the film opening mechanism 8 returned to the initial state as described above, the film of the square portion 1c of the preceding film 1-1 and the film piece 1Ba of the second film 1B were combined. The portion (welded portion) is folded so as to be close to the outer surface of the film 1B. Therefore, the welded portion can pass between the blocks 8a and 8b of the film opening mechanism 8 and between the plates 9a and 9b of the second film fixing mechanism 9 without any problem.

  However, when there is a possibility that the welded portion moves and obstructs the feeding of the film 1 in the process of transporting the film 1 through a packaging machine (not shown), the welded portion is welded to the outer surface of the film 1B and moved. It is better not to. If the position of this welding is made into the edge part of the width direction both sides of the film 1B, the vertical sealing mechanism of the vertical filling packaging machine shown by patent document 2 can be used for the apparatus which implements this welding.

  In addition, while the packaging machine manufactures the film packaging bag with the second film 1B, the operator replaces the first film 1A with a small remaining amount in the film supply unit 2 with a new first film 1A, The new film 1A is set in the first moving unit U1. The method for setting the first film 1A in the first moving unit U1 is the same as the method for setting the second film 1B in the second moving unit U2. After the controller of the splicing device determines that the remaining amount of the second film 1B has become equal to or less than the specified amount, the splicing is performed in the same manner as the operation described above with reference to FIGS. That is, if a new film is always made to stand by in the film supply part 2, a new film can be continuously succeeded to the preceding film.

  As described above, according to the joining device of the present embodiment, the reliability of the portion where the new inflation film is joined to the inflation film supplied to the continuous production machine for film packaging bags can be improved. On the other hand, in the case of the conventional technology for connecting films using a tape, if the operator does not stick the tape well, there is a risk that the connecting part may come off due to the tension applied to the film being transported, and there is a problem in the reliability of the connecting part there were. Moreover, although the operation | work which connects films using a tape was troublesome for an operator, this invention can release an operator from such a troublesome operation.

1 Film (inflation film)
1A First film (inflation film)
1B 2nd film 1-1 Film 1-2 that extends downstream (wrapping machine side) when film 1 is divided into 2 When film 1 is divided into 2 parts, it extends to the upstream side (film supply unit side) Film 1a Vertical cut 1b Horizontal cut 1c Square part 1Ba Film piece 2 Film supply part 2a, 2b Support shaft 3 Guide roller 4 First film fixing mechanism 4a, 4b Plate 5 Vertical cut mechanism 6 Welding mechanism 6a, 6b Block 7 Horizontal Cut mechanism 8 Film opening mechanism 8a, 8b Block 9 Second film fixing mechanism 9a, 9b Plate U1, U2 Moving unit

Claims (4)

A device for connecting a new tube-like film to a tube-like film composed of a front surface film and a back surface film whose inner side surfaces are in close contact with each other,
It has two cutting blades that can enter the film conveying path from the outside of the film conveying path for feeding the film, and the two cutting blades are opposed to the vicinity of both ends in the width direction of the film. A vertical cut mechanism that is arranged;
The film is disposed on the downstream side in the film transport direction with respect to the longitudinal cut mechanism, and the film is crossed across the two longitudinal cuts of the film formed in the film longitudinal direction by the two cutting blades of the longitudinal cut mechanism. A transverse cut mechanism that cuts across the entire width direction of the film and divides it into a preceding film and a subsequent film,
A quadrangle that is arranged on the downstream side in the film transport direction with respect to the horizontal cut mechanism, and is defined by an edge of the preceding film on the side of the subsequent film and the two vertical cuts made by the horizontal cut mechanism. A film opening mechanism for opening and holding the front side film and the back side film on the outside of the preceding film;
One moves the succeeding film made by the lateral cut mechanism to the outside of the film transport path, and the other moves the new film from the outside of the film transport path to the film opening mechanism of the film transport path. Two moving units that move upstream in the film transport direction, wherein the new film is moved to the other moving unit, and the front side film and the back side film at the front end are placed outside the new film. The two mobile units that can be held open and
The preceding film in which the front-side film and the back-side film at the leading end of the new film attached to the other moving unit are held open by the film opening mechanism. A welding mechanism for welding to the front side film and the back side film of the rectangular part of
A film joining apparatus comprising: The film opening mechanism holds the front-side film and the back-side film of the rectangular portion of the preceding film opened to the outside of the preceding film so as to form one flat surface on both sides,
The front side film and the back side film of the leading end of the new film can be held in the other moving unit in an open state so as to form one flat surface. The film splicing device described in 1. It is a method of connecting a new tubular film to a tubular film composed of a front surface film and a back surface film whose inner side surfaces are in close contact with each other,
For the film being transported along the film transport path, a longitudinal cutting step for forming two longitudinal cuts in the longitudinal direction of the film in the vicinity of both ends in the width direction of the film;
The conveyance of the film is stopped, and the film is cut across the entire width direction of the film so as to cross the two longitudinal cuts formed in the longitudinal direction of the film by the longitudinal cutting step, and divided into a preceding film and a subsequent film. A horizontal cutting process,
The front side film and the back side film of the quadrangular portion defined by the side edge of the subsequent film and the two vertical cuts of the preceding film made by the horizontal cutting step are arranged outside the preceding film. A film opening process for opening and holding
Preparing a mechanism for cutting and holding the front side film and the back side film at the end of the leading side of the new film to the outside of the new film; and
Retreating the succeeding film produced by the transverse cutting step from the film transport path, disposing the mechanism in the film transport path, and a front side film of the new film held in an open state; and A film moving step of making the back side film face the front side film and the back side film of the rectangular portion of the preceding film held in an open state,
The front-side film and the back-side film of the new film held in the opened state, and the front-side film and the back-side film of the square portion of the preceding film held in the opened state Welding process for welding to each of
A film joining method including: In the film opening step, the front side film and the back side film of the rectangular portion of the preceding film opened to the outside of the preceding film are both held to form one flat surface,
The film according to claim 3, wherein the front side film and the back side film of the leading end of the new film are held in the mechanism in an open state so as to form a single flat surface. Connecting method.

Images