JPH0627509U - Wrapping machine - Google Patents

Abstract

(57) [Summary] [Purpose] To secure the sealing property by heat welding when the joining position of the film coincides with the heat welding position without complicating the structure. [Structure] Newspaper P as an article to be packaged by films 3a and 5a supplied from upper and lower film rolls 3 and 5, respectively.
Of the film rolls 3 and 5 while covering the upper and lower sides of each of the films 3a and 5a to wrap the edge portions of the films 3a and 5a and heat-sealing the overlapped portions.
The film 3a, 5a and the film 3a, 5a are spared to the packaging machine which enables continuous supply of the film by superposing and joining the end parts of the a, 5a and the start ends of the spare films 15a, 16a of the spare film rolls 15, 16. Film 15
When the joining position of a and 16a coincides with the thermal welding position, the voltage applied to the thermal welding cutting mechanisms 14A and 14B is increased to enable the thermal welding of three or more films.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a packaging machine for automatically packaging an object to be packaged with a film, and more particularly to a packaging machine having a function of automatically joining the films to enable continuous supply of the films.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, there is known a wrapping machine that wraps, for example, a plurality of stacked paper sheets with a film. As an example of this type of packaging machine, as shown in JP-A-59-142921, a pair of upper and lower supply film rolls around which a film is wound are provided, and the film is pulled out from each supply film roll. The package is covered from above and below with the film, and the edges of the upper and lower films are heat-welded to package the packaged product.

Further, in this type of packaging machine, when the film wound around the supply film roll is used up, the film is automatically joined so that the film can be continuously supplied. is there. That is, a preliminary film roll is provided in the vicinity of the supply film roll, and when the film end portion of the supply film roll is detected, the end portion and the film start end portion of the preliminary film roll are overlapped and heat is applied. Weld it so that the packaging operation can be performed continuously.

[0004]

[Problems to be solved by the device]

 However, in a packaging machine that automatically splices films as described above, at the splicing position of the films, the films are overlapped with each other. If a situation occurs in which the alignment position coincides with the heat welding position when packaging the packaged object, there is a risk that this packaging may not be performed reliably. That is, as shown in FIG. 7, when the joining position a of the film coincides with the heat-sealing position at the time of packaging, in this part, three films b, c and d are overlapped with each other. Has become. Further, the heat-welding machines e and f for performing this heat-welding are set to the minimum amount of heat necessary for welding the two films to prevent their overheating. When three films b, c, and d are superposed, it may not be possible to melt each film b, c, d, which may result in poor sealing at the heat welding position, or in some cases packaging. There is a risk that it will not be possible. Further, as shown in FIG. 8, when the joining positions a and a ′ coincide with the heat welding positions on both the upper and lower films, four films b, c, d and g are superposed. As a result, the defective sealing and the unpackable state are more likely to occur.

In consideration of this point, the heat quantity for heat welding is always set large enough to weld the four films b, c, d, g to prevent overheating of the heat welding machines e, f. It may be possible to provide a cooling structure for this purpose, but this would not only result in a large energy loss, but would also lead to an increase in the size of the device, which is not practical.

The present invention has been made in view of these points, and does not result in a complicated structure, and even when the joining position of the film material coincides with the heat welding position, the present invention can be reliably performed. The purpose is to obtain a structure capable of ensuring the sealing property.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, the joining position of the film is recognized in advance, and the heat quantity for heat welding only when the joining position coincides with the heat welding position. The heat welding force is increased by increasing the size of the above. Specifically, the invention according to claim 1 is provided with a supply film roll arranged at a supply position and a preliminary film roll arranged at a standby position, and an object to be packaged is formed by the film supplied from the supply film roll. It is provided with a heat welding means for superimposing a part of the film wound around the article to be packaged and heat welding the superposed part, and the end part of the film of the supply film roll and the above It is premised on a packaging machine equipped with a joining means that enables continuous supply of the film by overlapping and joining the starting end portion of the auxiliary film roll. When the joining position of the films joined by the joining means coincides with the heat welding position of the film by the heat welding means, the heat welding force changing means for increasing the heat welding force in the heat welding means is provided. It is configured to be equipped.

According to a second aspect of the present invention, in the packaging machine according to the first aspect, the heat welding means is formed by a pair of heat welding mechanisms whose heat generation amount is changed according to an applied voltage. The heat-welding mechanism holds the overlapped portion of the film wound around the object to be packaged and heat-bonds the overlapped portion. When the joining position of the films joined by the joining means coincides with the heat welding position of the film by the heat welding means, the heat welding force changing means applies the voltage to the heat welding mechanism and the heat welding machine. The structure is designed to increase the holding time of the overlapping parts of the film.

According to a third aspect of the present invention, in the packaging machine according to the first or second aspect, a pair of a supply film roll and a spare film roll is provided on each of the upper and lower sides of a conveyance path of an object to be packaged, and the upper side is provided. The upper and lower films are covered with the film supplied from the supply film roll and the lower side of the transferred product by the film supplied from the lower supply film roll. The object to be packaged is packaged by heat welding.

[0010]

[Action]

 With the above configuration, the present invention provides the following actions. In the invention according to claim 1, a film supplied from a supply film roll arranged at a supply position is wound around an object to be packaged, parts of the films are overlapped, and the overlapped part is formed by a heat welding means. The items to be packaged are packaged by heat welding. Further, when the film of the supply film roll is used up, the end portion of the film of the supply film roll and the start portion of the spare film of the spare film roll arranged at the standby position are overlapped by the joining means. By connecting them together, it is possible to continuously supply the film. Then, only when the joining position of the films joined by the joining means coincides with the heat welding position of the film by the heat welding means, the heat welding force changing means increases the heat welding force in the heat welding means. Let For this reason, even if three or more films are superposed at the heat welding position, they can be welded together, thus ensuring the sealing property of the welded portion without causing energy loss. be able to.

According to the second aspect of the invention, when the joining position of the films coincides with the heat welding position of the film by the heat welding means, the voltage applied to the heat welding mechanism by the heat welding force changing means and the heat welding mechanism. The mechanism increases the holding time of the overlapping portion of the film. As a result, reliable heat welding can be performed by the heat welding mechanism, and sufficient sealing performance can be ensured.

According to the third aspect of the invention, the upper side of the transported object is covered with the film supplied from the upper supply film roll, and the lower side of the transported object is covered with the film supplied from the lower supply film roll. The upper and lower films are covered and heat-welded to each other by the heat-welding means to package the packaged object. Therefore, even in a packaging machine that wraps with such two upper and lower films, it is possible to obtain the action in the above-described aspect of the invention and to secure the sealing property of the welded portion.

[0013]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an overall view of a packaging machine 1 according to this example. The packaging machine 1 has an upper film roll 3 as a supply film roll according to the present invention placed at a supply position A1 above the first conveyor 2 arranged inside the packaging machine body 1a, while the packaging machine body is also the same. A lower film roll 5 as a supply film roll according to the present invention is also placed at a supply position A2 below the second conveyor 4 arranged inside 1a.

The upper film roll 3 is formed by winding the upper film 3a around a core tube 3b, and is rotatably supported by a pair of support rollers 6 and 6. The support rollers 6 and 6 are expanded and contracted in axial distance. It is possible.

The lower film roll 5 is formed by winding the lower film 5a around a core tube 5b, and is rotatably supported by a pair of supporting rollers 7, 7. The supporting rollers 7, 7 also have an inter-axial distance. Is extendable.

The upper film 3a can be fed toward the third conveyor 10 by the pinch rollers 9 and 9 via a plurality of guide rollers 8 and 8. Similarly, the lower film 5a can also be supplied onto the fourth conveyor 13 by the pinch rollers 12 and 12 via a plurality of guide rollers 11, 11, ....

Between the pinch rollers 9 and 12 and the third and fourth conveyors 10 and 13, for example, a vertical seal of the upper film 3a and the lower film 5a is provided, and the intermediate portion of this vertical seal is used for each film. The heat welding cutting mechanisms 14A, 14B constituting the heat welding means in the present invention for cutting in the width direction of 3a, 5a (the direction perpendicular to the paper surface in FIG. 1) are vertically opposed to each other with a predetermined interval. Has been done.

In addition, a standby position B1 near the supply position A1 where the upper film roll 3 is placed, and a standby position B2 near the supply position A2 where the lower film roll 5 is placed, respectively. , 16 are arranged.

As shown in FIG. 2, the preliminary film rolls 15 and 16 are supported on the bases 17 and 18 by support rollers 19, 19, ... And holding plates 20 and 20, respectively. In addition, pillars 21 and 21 are provided upright in the center of the bases 17 and 18, and film seals are provided at the upper ends of the pillars 21 and 21 via horizontally extending brackets 21a and 21a. Bars 22, 22 are attached. Then, the preliminary films 15a and 16a wound around the preliminary film rolls 15 and 16 supported by the bases 17 and 18 are attached to the film seal bars 22 and 22 by pulling out their starting ends. It is locked to the locking pins 22a, 22a. Further, the auxiliary film rolls 15 and 16 located at the standby positions B1 and B2 are supplied to the supply positions A1 and A2 in accordance with the push-up operation of the push-up rod 23 located below the bases 17 and 18. It is possible to move to. Further, at the positions above the film rolls 3 and 5 at the supply positions A1 and A2, which are opposed to the film sealing bars 22 and 22, there are provided sealing bar 24 and 24 with cylinders which can move back and forth. As the cylinder sealing bars 24, 24 move forward and backward, the films 3a, 5a of the film rolls 3, 5 at the supply positions A1, A2 and the standby positions B1 are moved between the film sealing bars 22, 22. , B2 spare film rolls 15 and 16 can be joined to the films 15a and 16a by heat welding. That is, the film sealing bar 22 and the cylinder sealing bar 24 constitute the connecting means 25 in the present invention.

As a characteristic configuration of this example, a movement signal is input to the controller C that controls the operating state of the packaging machine 1 when the cylinder sealing bars 24, 24 move forward. In addition, the voltage and the like applied to the heat welding cutting mechanisms 14A and 14B are changed to make the heat welding performance variable.

Next, the packaging operation of the packaging machine 1 configured as described above will be described. As shown in FIG. 1, the upper film 3a pulled out from the upper film roll 3 arranged at the upper supply position A1 goes toward the third conveyor 10 via the guide rollers 8, 8, ... And the pinch rollers 9, 9. Supplied. Similarly, the lower film 5a pulled out from the lower film roll 5 arranged at the lower supply position A 2 passes through the guide rollers 11, 11, ..., And the pinch rollers 12, 12 to the fourth conveyor 13. Supplied for. Simultaneously with the feeding operation of the films 3a and 5a, the newsprint P in which a large number of sheets are polymerized as the articles to be packaged from the first and second conveyors 2 and 4 toward the third and fourth conveyors 10 and 13 Is conveyed (see arrow D). Then, in the preceding step, a newspaper P is inserted between the upper and lower sides of the upper film 3a and the lower film 5a whose end edges located on the right side in FIG. 1 are heat-welded, and the newspaper P is inserted into the third and fourth conveyors. When the upper heat-welding cutting mechanism 14A moves down and the lower-side heat-welding cutting mechanism 14B ascends in a state where the heat-welding cutting mechanisms 14A and 14B are conveyed to the positions where the heat-welding cutting mechanisms 10 and 13 are arranged, the two heat-welding cutting mechanisms 14A and 14B. The upper and lower films 3A and 3B are clamped and heat-welded together. Further, following this heat welding operation, the central portion of the heat welding portion is cut (see the phantom line in FIG. 1), whereby the packing operation of the new paper P by the films 3a and 5a is completed, and the film 3a, The newspaper P packaged by 5a is conveyed to the downstream side of the third and fourth conveyors 10 and 13. Such an operation is continuously performed to continuously wrap the newspaper P.

Next, the characteristic operation of this example will be described. In addition, here, particularly, the periphery of the upper film roll 3 will be described. In a normal packaging operation, since the films 3a and 5a are introduced one by one at the heat welding positions of the films 3a and 5a, the two films 3a and 5a can be heat welded. A slight voltage is applied to the heat welding cutting mechanisms 14A and 14B, and the holding time by the heat welding cutting mechanisms 14A and 14B is set to be short, so that the heat welding cutting mechanisms 14A and 14B are prevented from overheating. Then, as shown in FIG. 3 (in FIG. 3, the peripheral portion of the upper film roll 3 is shown), the remaining amount of the upper film 3a of the upper film roll 3 becomes small, and as shown in FIG. When the seal is removed, the cylinder-equipped sealing bar 24 moves forward, and the end of the film 3a and the film 15a of the spare film roll 15 between the film sealing bar 22 supported by the base 17 move. The start end portion is sandwiched and the both 3a and 15a are heat-welded. Immediately thereafter, the cylinder sealing bar 24 is moved backward, whereby the films 3a and 15a are joined and the preliminary film 15a is released from the locking pin 22a, as shown in FIG. , 15a can be continuously supplied. In addition, when the films 3a and 15a are connected to each other in this way, the push-up rod 23 rises and pushes up the preliminary film roll 15, whereby the preliminary film roll 15 is supplied from the standby position B1. It is moved to position A1. Then, when such a joining operation of the films 3a and 15a is performed, the signal is transmitted to the controller C. Specifically, when the cylinder-equipped sealing bar 24 moves forward, a limit switch (not shown) is turned on, and a signal is transmitted from the limit switch to the controller C.

Then, when the signal is transmitted to the controller C in this way, the controller C integrates the feed amount of the film 15a and recognizes the joining position. Specifically, the splicing position is recognized by detecting the rotation amount of the preliminary film roll 15 that has moved to the supply position A1, or the time from the time when the films 3a and 15a are spliced by the timer. The joining position is recognized by measuring. When a situation occurs in which the joining position recognized as described above coincides with the heat welding position by the heat welding cutting mechanisms 14A, 14B, the controller C causes the heat welding cutting mechanisms 14A, 14B to move. The voltage to be applied is increased and the holding time of the films 3a and 15a by the heat welding cutting mechanisms 14A and 14B is extended. Specifically, in a situation in which only the joining position on one film of the upper and lower films coincides with the heat welding position, three films 3a, 15a, 5a are placed at this heat welding position. Since they are overlapped (see FIG. 7), the voltage applied to the heat-welding and cutting mechanisms 14A and 14B should be increased, for example, by a factor of 1.5 and the holding time should be slightly extended. Thus, the three films 3a, 15a, 5a can be integrally welded.

In the case where the joining position of both the upper and lower films coincides with the heat welding position, four films 3a, 15a, 5a, 16a are placed at this heat welding position. Since they are overlapped with each other (see FIG. 8), the voltage applied to the heat welding cutting mechanisms 14A and 14B can be doubled, for example, and the holding time thereof can be further extended. The films 3a, 15a, 5a, 16a can be integrally welded. Then, after this operation, at the heat welding position, the two films are overlapped again, so that the applied voltage and the holding time are returned to the original state. By repeating such operations, the reliable packaging operation is continuously performed without stopping the operating state of the packaging machine.

A specific operation procedure in the controller C for increasing the applied voltage and extending the holding time will be described with reference to the flowchart of FIG. Further, this flow chart shows the control operation of the heat welding cutting mechanism 14A on one side. After the start, it is first determined in step S1 whether or not the cylinder sealing bar 24 has moved forward. That is, it is determined whether or not the joining operation of the films 3a and 15a has been performed by the forward movement of the cylinder sealing bar 24. Then, in the case of YES when the sealing bar with cylinder 24 has moved forward, the process proceeds to step S2, and after the joining of the films 3a and 15a is detected, in step S3, the joining of the films 3a and 15a is detected. The step amount F of the film feed from the position where it was performed is integrated. That is, the amount of film pulled out from the preliminary film roll 15 is sequentially added until the current welding operation and the next welding operation by the upper and lower heat welding cutting mechanisms 14A and 14B. Then, in step S4, it is determined whether or not the integrated amount F is smaller than the film transport path length T to the film sealing bar 22 and the heat welding cutting mechanism 14A which is set in advance. Here, it is determined whether or not the joining position of the films 3a and 15a is still on the upstream side of the arrangement position of the heat welding cutting mechanism 14A. Then, in step S4, when it is determined that the integrated amount F is not smaller than the film transport path length T, that is, when the films 3a and 15a are connected to each other, the heat welding cutting mechanism 14A is disposed. If it is not on the upstream side of the position, the routine proceeds to step S5, where it is judged if the integrated amount F 1 is equal to the film transport path length T 1. Here, it is determined whether or not the joining position of the films 3a and 15a coincides with the heat welding position. If it is determined YES in step S5, that is, the cumulative amount F is equal to the film transport path length T, that is, if the joining position of the films 3a and 15a coincides with the heat welding position, Moving to S6, as described above, the applied voltage of the heat welding cutting mechanisms 14A and 14B is increased, and the holding time is extended, so that three or more films can be welded integrally. In this way, the upper film and the lower film are heat-welded while the heat-welding performance is increased, and then the process proceeds to step S7, in which the applied voltage and the holding time are returned to the initial values, and the film is returned. It If NO in step S5, it means that the splicing positions of the films 3a and 15a have passed without coincident with the heat welding position, and therefore the heat welding cutting mechanisms 14A and 14B have the same structure. Thermal welding is performed while the applied voltage and its holding time are maintained at the initial values, and the process is returned. Therefore, the step S6 constitutes the heat welding force changing means 26 in the present invention.

Further, such an operation is also performed on the lower film, and similarly, when the joining position of the lower films 5a and 16a coincides with the heat welding position, the heat welding cutting mechanism is also used. The voltage applied to 14A and 14B is increased, and the holding time is extended.

As described above, according to the configuration of this example, the amount of heat for heat welding can be obtained according to the number of films at the heat welding position. In the situation where the welding position matches, the situation in which the welding of the film is insufficient due to insufficient heat quantity and the sealing failure occurs is avoided, continuous accurate packaging work is performed, energy loss and heat welding are performed continuously. This can be achieved while avoiding the occurrence of overheating at the position, and reliability can be improved without degrading the durability of the packaging machine.

In this example, when the joining position of the film coincides with the heat welding position, the applied voltage and the holding time of the heat welding cutting mechanism are increased, but only one of them is used. May be increased.

[0029]

[Effect of device]

 As described above, the present invention has the following effects. According to the invention described in claim 1, when the joining position of the films joined by the joining means coincides with the heat welding position of the film by the heat welding means, heat for increasing the heat welding force in the heat welding means. By adopting a configuration in which the welding force changing means is provided, a thermal welding force that can integrally weld these films only when three or more films are superposed at the thermal welding position. Since it is made to exhibit, it is possible to secure the sealability of the welded portion without increasing energy loss and increasing the size of the device, and to improve the practicality.

According to the invention of claim 2, when the joining position of the films joined by the joining means coincides with the heat welding position of the film by the heat welding means, the heat welding force changing means causes the heat welding force changing means to Since the voltage applied to the welding mechanism and the holding time of the overlapping parts of the film by the heat welding mechanism are increased, reliable heat welding can be performed by the heat welding mechanism, and sufficient sealing performance can be secured. Can be achieved.

According to the third aspect of the invention, the supply film rolls are provided above and below the packaged object, and the film supplied from the upper supply film roll covers the upper side of the conveyed object and the lower supply film. Since the lower side of the object to be conveyed is covered with the film supplied from the roll and the upper and lower films are heat-welded by the heat-welding means to package the object to be packaged, such two upper and lower sheets are used. Even in a packaging machine for packaging with the film, it is possible to obtain the effect in the invention according to the above-mentioned claim 1, and to secure the sealing property of the welded portion.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a packaging machine.

FIG. 2 is a side view around a spare film roll.

FIG. 3 is a diagram showing a film supply operation.

FIG. 4 is a diagram showing a film joining operation.

FIG. 5 is a diagram showing an operation of supplying the joined films.

FIG. 6 is a flowchart showing a procedure of a heat welding force changing operation.

FIG. 7 is a diagram showing a state in which a film joining position on one side coincides with a heat welding position.

FIG. 8 is a diagram showing a state in which the film joining positions on both sides coincide with the heat welding positions.

[Explanation of symbols]

1 Wrapping Machine 3,5 Film Roll (Supply Film Roll) 3a, 5a Upper Film 14A, 14B Heat Welding Cutting Mechanism (Heat Welding Means) 15,16 Preliminary Film Roll 15a, 16a Preliminary Film 25 Joining Means 26 Heat Welding Force Change Means A1, A2 Supply position B1, B2 Standby position P Newspaper (Item to be packaged)

Claims (3)

[Scope of utility model registration request] 1. A supply film roll arranged at a supply position and a preliminary film roll arranged at a standby position, wherein the film to be packaged can be wrapped by the film supplied from the supply film roll. It is provided with a heat welding means for superposing a part of the film wound around the package and heat welding the superposed part, and the end portion of the film of the supply film roll and the start end of the auxiliary film of the auxiliary film roll. In a packaging machine provided with a joining means that enables continuous supply of the film by overlapping and joining the parts, the joining position of the films joined by the joining means is the heat of the film by the heat welding means. And a heat welding force changing means for increasing the heat welding force in the heat welding means when the welding position matches. Packaging machine and butterflies. 2. The heat-welding means is composed of a pair of heat-welding mechanisms whose heat generation amount is changed according to an applied voltage, and the heat-welding mechanism holds the overlapped portion of the film wound around the object to be packaged. Then, the superposed portion is heat-welded, and the heat-welding force changing means, when the joining position of the films joined by the joining means coincides with the heat-welding position of the film by the heat-welding means. The packaging machine according to claim 1, wherein the packaging machine is configured to increase the voltage applied to the heat welding mechanism and the holding time of the overlapping portions of the films by the heat welding mechanism. 3. A supply film roll and a spare film roll are provided in a pair on each of the upper and lower sides of the conveyance path of the article to be packaged, and the film supplied from the upper supply film roll covers the upper side of the article to be conveyed. It is configured to cover the lower side of the transported object by the film supplied from the lower supply film roll, and to package the packaged object by thermally welding the upper and lower films by the thermal welding means. The packaging machine according to claim 1 or 2, which is characterized in that.