Film conveyor, film conveying method, and film manufacturing apparatus

Abstract

According to an embodiment of the present disclosure, it is possible to provide a film conveyor or the like that prevents the leading end of a film from hanging down and appropriately feeds the film, even when the film is thin.SOLUTION: The film conveyor according to the present disclosure includes the feed mechanism 70 including the film conveyance bases 720 and 730 that are movable between the retracted position and the conveyance position and on which the film is placed, and the airflow generation device 80 that generates an airflow along the surfaces of the film conveyance bases. The air flow generation device 80 is configured to generate an air flow toward the surface of the film conveying table to cause the air flow to flow along the surface of the film conveying table SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a film conveying machine, a film conveying method, and a film manufacturing apparatus. [Background technology]

[0002] Patent Document 1 discloses a stretching machine that conveys an extruded film and stretches the film, and a clipping device that grips the film with clips. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-187788 Summary of the Invention [Problem to be solved by the invention]

[0004] Until now, because it was not possible to feed the film between the longitudinal stretching area and the transverse stretching area, after longitudinal stretching, the film was placed on a conveyor table and manually fed close to the clip closer by multiple people. The conveyor table can be placed close to the clip closer, but it must be slightly separated from the clip closer to avoid physical interference with the clip closer. Any film that extends from the tip of the conveyor table toward the clip closer (especially if the film is thin) will continue to droop as it is conveyed. This can make it difficult for the clip closer to fasten the clip to the film.

[0005] The present disclosure has been made to solve such problems, and aims to provide a film conveying machine or the like that can properly feed a film, even if it is a thin film, by preventing the leading edge of the film from drooping. [Means for solving the problem]

[0006] The film conveying machine according to the present disclosure comprises a feed mechanism including a film conveying table for placing a film, which is movable between a retracted position and a conveying position, and an airflow generating device for generating an airflow along the surface of the film conveying table.

[0007] The film transport method of the present disclosure includes moving a film transport table from a retracted position to a transport position, placing a film on the film transport table, and generating an air flow along the surface of the film transport table using an air flow generating device.

[0008] The film manufacturing apparatus according to the present disclosure includes an extruder that melts and extrudes an input resin raw material, a die connected to the extruder that forms the molten resin into a film, a cooling roll that cools the film-like molten resin extruded from the die and conveys a resin film formed by solidifying the molten resin, a longitudinal stretching machine that is located downstream of the cooling roll and longitudinally stretches the film and sends it downstream, a feed mechanism that is movable between a retracted position and a conveying position and includes a film conveying table for placing the film on and an airflow generating device that generates an airflow along the surface of the film conveying table, and a transverse stretching machine that is located downstream of the feed mechanism and transversely stretches the film and sends it downstream. [Effects of the Invention]

[0009] According to one embodiment of the present disclosure, it is possible to provide a film conveying machine or the like that can prevent the leading edge of a thin film from drooping and appropriately feed the film. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic perspective view showing the overall configuration of a film transporter and a film manufacturing apparatus according to a first embodiment. [Figure 2] 1 is a schematic perspective view showing the configuration of a film feed mechanism according to a first embodiment. [Figure 3] FIG. 10 is a schematic perspective view showing the configuration of a film feeding mechanism according to a modified example of the first embodiment. [Figure 4] FIG. 10 is a side view illustrating the effect of airflow on film transport. [Figure 5] FIG. 10 is a schematic perspective view showing the overall configuration of a film transporter and a film manufacturing apparatus according to a second embodiment. [Figure 6] FIG. 10 is a schematic perspective view showing the configuration of a film feed mechanism according to a second embodiment. [Figure 7] FIG. 10 is a schematic perspective view showing the operation of a film feeding mechanism according to a third embodiment. [Figure 8] FIG. 10 is a schematic perspective view showing the operation of a film feeding mechanism according to a third embodiment. [Figure 9] FIG. 10 is a schematic perspective view showing a film feeding mechanism and a clip device according to another embodiment. [Figure 10] FIG. 10 is a top view illustrating the wrinkle-smoothing operation by the belt conveyor. [Figure 11] FIG. 10 is a top view illustrating the wrinkle-smoothing operation by the belt conveyor. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, specific embodiments will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, the following description and drawings have been simplified appropriately for clarity.

[0012] (First embodiment) <Overall configuration of film manufacturing equipment> First, the overall configuration of a film manufacturing apparatus including a resin film conveying device according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a schematic perspective view showing the overall configuration of the film manufacturing apparatus according to the first embodiment.

[0013] The xyz Cartesian coordinate system shown in Figure 1 and other drawings is for the convenience of explaining the positional relationship of the components. Typically, the positive z-axis direction is vertically upward, and the xy plane is a horizontal plane, which is common to all drawings. In this specification, the film may be a resin film and may include a resin sheet.

[0014] As shown in Fig. 1, the film production apparatus 1 includes an extruder 10, a T-die 20, a cooler 30, a longitudinal stretching machine 40, a feed mechanism 70, an airflow generating device 80, a transverse stretching machine 50, and a winder 60. The film production apparatus according to the first embodiment is an extrusion molding type film production apparatus that extrudes a film-like molten resin 82a from a gap between the lips of the T-die 20 connected to the extruder 10. Note that detailed portions of the feed mechanism 70 having a belt conveyor 731 are omitted from Fig. 1.

[0015] The extruder 10 shown in Fig. 1 is a screw-type extruder. In the extruder 10, a screw extending in the x-axis direction is housed inside a cylinder 11 extending in the x-axis direction. A hopper 13 for feeding resin pellets, which are the raw material for the resin film 83, is provided above the end of the cylinder 11 on the negative x-axis direction side.

[0016] Resin pellets supplied from the hopper 13 are transported from the base to the tip of the rotating screw, i.e., in the positive direction of the x-axis. Inside the cylinder 11, the resin pellets are heated and sheared by the rotating screw, causing them to melt and turn into molten resin 82.

[0017] Although not shown, the screw is connected to a motor as a drive source via a reducer, for example. A heater for heating the inside of the cylinder 11 is provided on the outer circumferential surface of the cylinder 11 over substantially the entire longitudinal area, and the resin pellets introduced into the cylinder 11 are heated.

[0018] As shown in FIG. 1, the T-die 20 is connected to the lower side of the tip end (end on the positive x-axis direction) of the extruder 10. A film-like molten resin 82a is extruded downward (negative z-axis direction) through a gap in the lip located at the lower end of the T-die 20. Here, the lip spacing of the T-die 20 can be adjusted. The lip spacing of the T-die 20 can be adjusted at multiple points along the longitudinal direction of the lip (y-axis direction) so that the thickness of the resin film 83 produced in the width direction (y-axis direction) is uniform.

[0019] As shown in FIG. 1, the cooler 30 includes cooling rolls CR1 to CR4. The cooling roll CR1 cools the film-shaped molten resin 82a extruded from the T-die 20, and delivers the resin film 83 formed by solidifying the film-shaped molten resin 82a to the cooling roll CR2. The cooling roll CR1 is also called a casting roll.

[0020] 1, the cooling rolls CR2 to CR4 transport the resin film 83 in this order while cooling it. Each of the cooling rolls CR1 to CR4 may be a drive roll driven by a drive source (not shown). The drive source is, for example, a variable speed motor such as a servo motor.

[0021] Each of the cooling rolls CR1 to CR4 may be provided with a cooling mechanism for cooling the resin film 83. Each of the cooling rolls CR1 to CR4 may be provided with a heating mechanism for heating the resin film 83. The cooling device 30 includes a plurality of drive rolls for transporting the resin film 83, and therefore can be one form of the film transport device according to this embodiment.

[0022] As shown in Fig. 1, the longitudinal stretching machine 40 stretches the resin film 83 carried out from the cooling machine 30 in the longitudinal direction while transporting the same. The longitudinal stretching machine 40 shown in Fig. 1 includes eleven rolls R1 to R11. Each of the rolls R1 to R11 is a driving roll driven by a driving source (not shown). The driving source is, for example, a variable speed motor such as a servo motor. The longitudinal stretching machine 40 is one form of a film transporting machine according to this embodiment.

[0023] The longitudinal stretching machine 40 may be provided with a plurality of drive rolls for transporting the resin film 83, and the number and arrangement of the drive rolls provided in the longitudinal stretching machine 40 may be determined appropriately. Each of the rolls R1 to R11 may be provided with at least one of a cooling mechanism for cooling the resin film 83 and a heating mechanism for heating the resin film 83. Furthermore, the longitudinal stretching machine 40 may be provided with one or more nip rolls for pressing the resin film 83 against any of the rolls R1 to R11. The nip rolls are not drive rolls. In addition, the region in the film transport path where the film is longitudinally stretched by the longitudinal stretching machine 40 is also called the longitudinal stretching region.

[0024] The feeding mechanism 70 assists in feeding the resin film 83 discharged from the longitudinal stretching machine 40 to the subsequent transverse stretching machine 50 (particularly, the clip closer 501 in FIG. 7 ). Previously, the film was placed on a conveying table and manually fed downstream. However, there was a risk of the film coming into contact with the clip closer or conveying machine. Therefore, in the present disclosure, a film feeding mechanism 70 is newly provided, which has the function of feeding the film (although manual labor may be required in some cases). Details of this feeding mechanism 70 will be described later. The feeding mechanism 70 may be one form of the film conveying device according to this embodiment. An airflow generating device 80 that generates an airflow is provided for the belt conveyor 731, which is the film conveying table of the feeding mechanism 70. The airflow generating device 80 may be, for example, a fan, but is not limited thereto and may be any of various types of devices (e.g., a blower) that generate an airflow that would be understood by those skilled in the art.

[0025] The transverse stretching machine 50 stretches the resin film 83 delivered from the feed mechanism 70 in its width direction (y-axis direction). More specifically, the transverse stretching machine 50 includes a pair of rails RL1 and RL2. A large number of clips (not shown) are slidably arranged in parallel along the entire length of the rails RL1 and RL2.

[0026] In FIG. 1, the arrows on the rails RL1 and RL2 indicate the movement direction of the clips. As shown in FIG. 1, the rails RL1 and RL2 have a loop structure with an outgoing path along which the clips move in the conveying direction of the resin film 83 (positive direction of the x-axis) and a returning path along which they move in the opposite direction (negative direction of the x-axis). That is, in the transverse stretching machine 50, the clips revolve around the rails RL1 and RL2 having the loop structure. Although not shown in FIG. 1, a clip closer (501 in FIG. 7) closes the tenter clips on the film. As shown in FIG. 1, the rails RL1 and RL2 have a symmetrical configuration with respect to a plane parallel to the xz plane.

[0027] 1, rails RL1 and RL2 are both arranged substantially parallel to each other on the outgoing path that advances in the conveyance direction (positive direction of the x-axis) and the returning path that advances in the opposite direction (negative direction of the x-axis). The returning path of rail RL1 is arranged on the outer side in the width direction of resin film 83 (negative direction of the y-axis). The returning path of rail RL2 is also arranged on the outer side in the width direction of resin film 83 (positive direction of the y-axis).

[0028] As shown in Figure 1, the outgoing paths of rails RL1 and RL2 have a pair of parallel portions parallel to the x-axis at both ends in the longitudinal direction (x-axis direction), and an inclined portion inclined in the y-axis direction between the parallel portions. The inclined portion of rail RL1 is inclined in the negative direction of the y-axis, and the inclined portion of rail RL2 is inclined in the positive direction of the y-axis. That is, in the inclined portions of the outgoing paths of rails RL1 and RL2, the distance between rails RL1 and RL2 in the y-axis direction increases as the rails progress in the positive direction of the x-axis.

[0029] 1, in the portions where the clips come into contact with the resin film 83, the clips grip both ends of the resin film 83 in the width direction (y-axis direction) and move in the positive x-axis direction along the rails RL1 and RL2. Therefore, as shown in FIG. 1, in the oblique portions of the outgoing passes of the rails RL1 and RL2, the resin film 83 is stretched in the width direction (y-axis direction) while being transported in the positive x-axis direction. On the other hand, in the parallel portions of the outgoing passes of the rails RL1 and RL2, the resin film 83 is only transported in the positive x-axis direction and is not stretched in the width direction (y-axis direction).

[0030] 1 has a drive source that drives clips for transporting the resin film 83. The drive source is, for example, a variable speed motor such as a servo motor. The transverse stretching machine 50 can be one form of the film transport device according to this embodiment.

[0031] The resin film 83 discharged from the transverse stretching machine 50 is taken up by the winder 60. The winder 60 is a drive roll driven by a drive source (not shown). The winder 60 may include multiple drive rolls driven by a drive source. In this case, the winder 60 can be one form of the film transport machine according to this embodiment. In addition, the region in the film transport path where the film is transversely stretched by the transverse stretching machine 50 is also called the transverse stretching region.

[0032] As described above, in the film conveying machine of this embodiment, some or all of the cooling machine 30, the longitudinal stretching machine 40, the feed mechanism 70, the transverse stretching machine 50, and the winding machine 60 may be one aspect of the film conveying machine of this embodiment.

[0033] <Overall configuration of the feed mechanism> 2 is a schematic perspective view showing the configuration of a film feeding mechanism. As an example, the feeding mechanism 70 can be provided downstream of the longitudinal stretching machine 40 and upstream of the transverse stretching machine 50 in the film transport path.

[0034] The feed mechanism 70 includes a liftable lower platform 730 having a belt conveyor 731. The belt conveyor 731 includes a plurality of rolls 731R, 731R provided at both ends, and a belt 7311 stretched over the plurality of rolls. The roll 731R is a roll with a built-in motor. The belt conveyor may be any of various known belt conveyors.

[0035] The lower table 730 can be raised and lowered vertically by an elevating mechanism 735. When a sensor detects the film 83 fed from the longitudinal stretching machine 40, the lower table 730 is raised vertically from the retracted position (downward along the vertical arrow from the position in FIG. 2) to the conveying position (position in FIG. 2) by the elevating mechanism 735. The lower table 730 is normally in the retracted position to prevent contact with the film and damage to it. The lower table 730 is raised to the conveying position (FIG. 2) when the film is conveyed between the longitudinal stretching region and the transverse stretching region and when the clips are attached (chucking). The belt conveyor 731 is driven (and manually conveyed) to convey the film toward the downstream clip closer (501 in FIG. 9). At this time, the airflow generating device 80 generates an airflow toward the lower table 730, causing the airflow AF to flow along the upper surface of the lower table 730. This prevents the leading edge of the thin film from sagging, allowing the clip closer to properly chuck it. After that, after chucking is completed, 720 descends to the retracted position.

[0036] Guide rolls 729, 729 are provided to guide the film sent from the longitudinal stretching machine 40. Two meandering detection units 90 are provided after the guide rolls 729, 729. One or more meandering detection units 90 can be disposed immediately after the longitudinal stretching machine 40 or between the longitudinal stretching machine 40 and the transverse stretching machine 50.

[0037] In this way, belt conveyor 731 can appropriately send the film to be conveyed downstream together with the airflow from the airflow generating device, thereby enabling appropriate chucking by the clip closer.

[0038] FIG. 3 is a schematic perspective view showing the configuration of a film feeding mechanism according to a modified example of the first embodiment. The feed mechanism 70 of FIG. 3 is basically the same as the feed mechanism 70 of FIG. 2. Unlike the lower table 730 having a belt conveyor 731 shown in FIG. 2, FIG. 3 shows a lower table 730 that can be raised and lowered (without a belt conveyor). In the example shown in FIG. 3, the lower table 730 is movable between a retracted position and a transport position. The film 83 is manually transported downstream while placed on the lower table 730 in the transport position. The airflow generating device 80 generates an airflow toward the lower table 730, causing the airflow AF to flow along the upper surface of the lower table 730. This prevents the film 83 from sagging, even when the film is thin, as it extends from the leading edge of the lower table toward the clip closer. As a result, there is no need to manually grasp the leading edge of the film; the airflow allows the clip closer to properly attach the clip to the film. This prevents a human hand from getting caught in the clip closer.

[0039] FIG. 4 is a side view illustrating the effect of airflow on film transport. 4, especially when film 83 is thin (for example, the film thickness is 50 microns or less), film 83 extending from the tip of conveyor table 730 toward clip closer (not shown) hangs down during conveyance, making it difficult for the clip closer to attach clips to the film.

[0040] 4, when airflow AF1 from airflow generating device 80 hits film 83 and lower base 730 and then becomes airflow AF2 on the upper surfaces of film 83 and lower base 730 due to convection, the leading edge of film 83 can be transported toward the clip closer without drooping, allowing the clip closer to attach a clip to the film.

[0041] The position and form of the airflow generator 80 are not particularly limited, and various modifications are possible. In another embodiment, an airflow generator 80b movable between a retracted position and an airflow generating position may be provided downstream of the transported film 83. In this case, after the longitudinal stretching is completed, when the film is transported to a transverse stretching area (e.g., a clip closer), the lower table 730 moves from the retracted position to the transport position, and then the airflow generator 80b moves from the retracted position to near the upper surface of the lower table 730 to generate an airflow AF2 along the upper surfaces of the film 83 and the lower table 730. Furthermore, in another embodiment, in addition to the airflow AF2, an auxiliary airflow generator 80c may be provided to generate an airflow AF3 from below the film 83 extending from the tip of the transport table 730.

[0042] (Second embodiment) <Overall configuration of film manufacturing equipment> First, the overall configuration of a film manufacturing apparatus including a resin film conveying device according to a second embodiment will be described with reference to Fig. 5. Fig. 5 is a schematic perspective view showing the overall configuration of the film manufacturing apparatus according to the first embodiment. In Fig. 5, the same components as those in the first embodiment are given the same reference numerals as those in Fig. 1, and descriptions thereof will be omitted where appropriate.

[0043] The xyz Cartesian coordinate system shown in Figure 5 and other drawings is for the convenience of explaining the positional relationship of the components. Typically, the positive z-axis direction is vertically upward, and the xy plane is a horizontal plane, which is common among the drawings. Also, in this specification, the film may be a resin film and may include a resin sheet.

[0044] As shown in Fig. 5, the film production apparatus 1 includes an extruder 10, a T-die 20, a cooler 30, a longitudinal stretching machine 40, a feed mechanism 70, an airflow generating device 80, a transverse stretching machine 50, and a winder 60. The film production apparatus according to the first embodiment is an extrusion molding type film production apparatus that extrudes a film-like molten resin 82a from a gap between the lips of the T-die 20 connected to the extruder 10. Note that detailed portions of the robot mechanism 71 and the lower roll mechanism 72 that constitute the feed mechanism 70 are omitted from Fig. 5.

[0045] The feeding mechanism 70 automatically feeds the resin film 83 discharged from the longitudinal stretching machine 40 to the subsequent transverse stretching machine 50. Until now, the longitudinal stretching machine 40 and the transverse stretching machine 50 have different feeding mechanisms, so manual work by multiple people was required to feed the resin film 83 discharged from the longitudinal stretching machine 40 to the subsequent transverse stretching machine 50. However, since this work is tedious and inefficient, the present disclosure provides a new film feeding mechanism 70 having the function of gripping and feeding the film. Details of this feeding mechanism 70 will be described later. The feeding mechanism 70 can be one form of a film conveying device related to this embodiment.

[0046] In the film transporting machine according to this embodiment, some or all of the cooling machine 30, the longitudinal stretching machine 40, the feeding mechanism 70, the transverse stretching machine 50, and the winding machine 60 may be one aspect of the film transporting machine according to this embodiment.

[0047] <Overall configuration of the feed mechanism> 6 is a schematic perspective view showing the configuration of a film feeding mechanism. As an example, the feeding mechanism 70 can be provided downstream of the longitudinal stretching machine 40 and upstream of the transverse stretching machine 50 in the film transport path.

[0048] The feeding mechanism 70 includes a robot arm 715 having a belt conveyor 711 below its tip, and a lower roll table 720 that is provided below the belt conveyor 711 and is capable of moving up and down and has multiple rolls UR. The lower roll table 720 is an example of a film transport table and can be moved up and down vertically by a lifting mechanism 725. In FIG. 6, the lifting mechanism 725 includes three lifting units that can move up and down synchronously. The lower roll table 720 is normally in a retracted position (downward along the vertical arrow from its position in FIG. 6) to prevent damage to the film upon contact with it. When the film is transported between the longitudinal stretching zone and the transverse stretching zone and when clips are attached (chucking), it rises to the transport position (FIG. 6). The tip of the robot arm 715 descends, and the film 83 is gripped between the belt conveyor 711 and the lower roll table 720. As the belt conveyor 711 is driven, the film is fed toward the downstream clip closer (501 in FIG. 9). At this time, as described above, the airflow generating device 80 generates an airflow toward the lower roll base 720, causing the airflow to flow along the upper surface of the lower roll base 720. This prevents the leading edge of the thin film from sagging, allowing the clip closer to properly chuck the film. After chucking is complete, the lower roll base 720 descends to the retracted position.

[0049] The robot arm 715 may be a six-axis vertical articulated robot arm. The robot arm 715 includes a base 7150 fixed to the floor, a first link 7151 rotatably and tiltably attached to the base 7150, a second link 7152 tiltably and tiltably attached to the tip of the first link 7151, and a wrist 7153 tiltably attached to the tip of the second link 7152. Various known robot arms may be used as the robot arm.

[0050] The belt conveyor 711 is connected to the tip of the robot arm 715 via a mounting part 712. The belt conveyor 711 includes a plurality of rolls 711R, 711R provided at both ends, and a belt 7111 stretched over the plurality of rolls. The roll 711R is a roll with a built-in motor. The belt conveyor may be any of various known belt conveyors.

[0051] Guide rolls 729, 729 are provided to guide the film sent from the longitudinal stretching machine 40. Two meandering detection units 90 are provided after the guide rolls 729, 729. One or more meandering detection units 90 can be disposed immediately after the longitudinal stretching machine 40 or between the longitudinal stretching machine 40 and the transverse stretching machine 50.

[0052] <Overall configuration of the feed mechanism> Fig. 7 is a schematic perspective view showing the configuration of a film feeding mechanism. As an example, feeding mechanism 70 can be provided downstream of longitudinal stretching machine 40 and upstream of transverse stretching machine 50 in the film transport path. Belt conveyor 711 in Fig. 7 is narrower than belt conveyor 711 in Fig. 6 and is configured to grip only one side (the left side) of the film.

[0053] The feeding mechanism 70 includes a robot arm 715 having a belt conveyor 711 below its tip, and a lower roll platform 720 that is provided below the belt conveyor 711 and has multiple rolls. The lower roll platform 720 can be raised and lowered vertically by a lifting mechanism 725. In FIG. 7, the lifting mechanism 725 includes three lifting units that can be raised and lowered synchronously. The lower roll platform 720 is normally located in a retracted position (downward along the vertical arrow from the position in FIG. 7) to prevent contact with the film and damage it. When the film is transported and chucked between the longitudinal stretching zone and the transverse stretching zone, it is elevated to the transport position (FIG. 7). The lower roll platform 720 includes multiple lower right rolls (RUR) and lower left rolls (LUR) arranged in two rows so that the film can be loaded and transported. The belt conveyor 711 shown in FIG. 7 is provided facing the lower left roll (LUR), but it may also be provided facing the lower right roll (RUR).

[0054] The robot arm 715 may be a six-axis vertical articulated robot arm. The robot arm 715 includes a base 7150 fixed to the floor, a first link 7151 rotatably and tiltably attached to the base 7150, a second link 7152 tiltably and tiltably attached to the tip of the first link 7151, and a wrist 7153 tiltably attached to the tip of the second link 7152. Various known robot arms may be used as the robot arm.

[0055] The belt conveyor 711 is connected to the tip of the robot arm 715 via a mounting part 712. The belt conveyor 711 includes a plurality of rolls 711R, 711R provided at both ends, and a belt 7111 stretched over the plurality of rolls. The roll 711R is a roll with a built-in motor. The belt conveyor may be any of various known belt conveyors.

[0056] Airflow generator 80 is installed above lower roll table 720. Airflow generator 80 generates an airflow on the upper surface of the lower roll table when the film is gripped between belt conveyor 711 and lower roll table 720 and sent downstream toward the clip closer (501 in Figure 9) by the drive of belt conveyor 711. This prevents the leading edge of the thin film from drooping, allowing the clip closer to chuck it properly.

[0057] Guide rolls 729, 729 are provided to guide the film sent from the longitudinal stretching machine 40. Two meandering detection units 90 are provided after the guide rolls 729, 729. One or more meandering detection units 90 can be disposed immediately after the longitudinal stretching machine 40 or between the longitudinal stretching machine 40 and the transverse stretching machine 50.

[0058] <Feed mechanism operation> FIG. 8 is a schematic perspective view showing the operation of the film feeding mechanism. As shown in Figure 8, in the feed mechanism 70, the lower roll platform 720 is raised (from the retracted position to the conveying position), thereby placing the film 83, which is fed from upstream, on the lower roll platform 720. That is, the lower roll platform 720 is movable between the retracted position and the conveying position. Next, the robot arm 715 lowers its tip, thereby gripping the film 83 between the belt conveyor 711 and the lower roll platform 720, and conveying the film 83 downstream by the rotation of the belt conveyor 711. That is, the belt conveyor 711 held by the robot arm 715 is movable between the retracted position and the conveying position (gripping position).

[0059] As shown in FIG. 5 , the film 83 fed from the longitudinal stretching machine 40 is fed along guide rolls 729, 729 provided at both ends of the path to above the lower roll platform 720 of the lower roller mechanism 72. When the fed film 83 is detected by a sensor (either from the longitudinal stretching machine 40 or manually), the lifting mechanism 725 is activated, and the lower roll platform 720 is raised from the retracted position to a predetermined position (transport position), allowing the film 83 to be placed on the lower roll platform 720. The film 83 is moved downstream on the rolls of the lower roll platform 720 by the longitudinal stretching machine 40. The rolls on the lower roll platform 720 may include a plurality of lower right rolls RUR and a plurality of lower left rolls LUR arranged in two rows. Each roll may be a drive roll driven by a drive source (not shown), or a free roll without a drive source.

[0060] When a sensor detects that the film 83 has been fed to a predetermined position on the roll of the lower roll table 720 by the longitudinal stretching machine 40 (or the drive roll), the robot arm 715 lowers the belt conveyor 711 at its tip from the retracted position to the transport position (gripping position). Specifically, as shown in FIG. 8 , the belt conveyor 711 descends substantially parallel to the multiple lower left rolls LUR of the lower roll table 720, gripping the film 83 during this time. When the belt conveyor 711 drives the multiple rolls 711R, 711R, the film 83 gripped by the belt 7111 and the multiple lower left rolls LUR is sent downstream. At this time, the airflow generating device 80 generates an airflow toward the surface of the lower roll table 20, thereby preventing the leading edge of the film from drooping. In addition, if the multiple lower left rolls LUR have drive sources, the multiple lower left rolls LUR may rotate in synchronization with the multiple rolls 711R of the belt conveyor 711.

[0061] Figure 8 shows one robot mechanism 71 corresponding to the multiple lower left rolls LUR shown in Figure 7, but since the operation of the lower roll base 720 and robot mechanism 71 shown in Figure 6 is similar, detailed explanation will be omitted.

[0062] 7 and 8 show one robot mechanism 71 corresponding to multiple lower left rolls LUR, but another robot mechanism corresponding to multiple lower right rolls RUR may be provided. Alternatively, the robot mechanism 71 may have two branched second links 7152, 7152 corresponding to multiple lower right rolls RUR and lower left roll LUR, respectively. In some embodiments, the lower side of the robot arm may have a first conveyor corresponding to multiple left rolls and a second conveyor corresponding to multiple right rolls. In this case, the first conveyor and second conveyor are each configured to be rotatable about a vertical axis.

[0063] As described above, wrinkles in the film can be smoothed out by sending the film downstream while holding it between the multiple lower right rolls RUR and the belt conveyor 711. In addition, the airflow generated by the airflow generator can prevent the leading edge of the film from sagging.

[0064] In some embodiments, a meandering detection unit 90 (e.g., various sensors such as a camera, laser sensor, or edge sensor) may be provided above the lower roll base 720 to detect whether the film is meandering. For example, in FIG. 7, the meandering detection unit 90 is an edge sensor that detects both ends of the film after the longitudinal stretching region. If the meandering of the film is detected by the meandering detection unit 90, the robot arm 715 may rotate about its axis in the vertical direction while pressing the belt conveyor 711 against the film 83 placed on the lower roll base 720 based on the detection result. For example, if the film is meandering to the left of the traveling direction, the robot arm 715 rotates about its axis in the vertical direction clockwise while pressing the belt conveyor 711 against the film 83 placed on the lower roll base 720. This allows the film meandering to be corrected, allowing the subsequent clip closer 501 (FIG. 9) to properly close the clip and perform transverse stretching. The operation of the robot arm 715 is controlled by a control unit (not shown). The control unit receives sensor signals from various sensors such as the meandering detection unit 90, and can control the driving of various driving units related to the robot arm, etc. based on the sensor signals. The control unit can execute various controls based on various programs stored in the storage unit, and is realized by a central processing unit (CPU), read-only memory (ROM), random access memory (RAM), input / output ports (I / O), etc.

[0065] FIG. 9 is a schematic perspective view showing a film feeding mechanism and a clip device according to another embodiment. After the aforementioned feed mechanism 70, clip devices 500 are arranged on both ends of the film. In Fig. 9, only the clip device 500 for the left end of the film is shown, but the clip device 500 for the right end of the film can also be arranged approximately symmetrically. As shown in Fig. 9, the lower roll base 720 and the clip closer 501 are slightly spaced apart.

[0066] As described above, the feed mechanism 70, using the belt conveyor 711 and the lower roll table 720, grips the film and feeds it, along with the airflow, to the position of the clip closers 501. One clip closer 501 closes a clip on one end of the gripped film. Then, the other clip closer 501 closes a clip on the other end of the gripped film. This clip attachment operation is also called chucking. After the left and right clip closers 501, 501 close clips on both ends of the film, the film transporter can move the film downstream. In this way, the feed mechanism 70 can assist the clip closers in their clipping operation for transverse stretching. This reduces or eliminates manual work by multiple people, prevents human hands from getting caught in the clip closers, and enables safe and smooth chucking and transport of the film.

[0067] In some embodiments, a wrinkle detection unit 7121 (e.g., a camera) that detects wrinkles in the film 83 may be provided above the lower roll base 720 (e.g., below the mounting portion 712 of the robot arm 715). The wrinkle detection unit 7121 (e.g., a camera or edge sensor) may be provided in a location separate from the robot arm 715 (e.g., on the ceiling) between the longitudinal stretching machine 40 and the robot arm 715. Based on the captured image of the film, the robot arm 715 can also rotate the belt conveyor 711 on the vertical axis while pressing it against the film 83 placed on the lower roll base 720, as shown in FIG. 10. This can remove localized wrinkles in the film. In other embodiments, the two belt conveyors 711, 711 can move widely to the left and right while holding down the film, as shown in FIG. 11, to remove wrinkles in the film. Alternatively, one of the two belt conveyors may remain fixed near one edge of the film while the other belt conveyor moves toward the other edge of the film to remove wrinkles from the film. The operation of robot arm 715 is controlled by a control unit (not shown). The control unit receives sensor signals from various sensors, such as wrinkle detection unit 7121, and can control the operation of various drive units related to the robot arm, etc., based on the sensor signals.

[0068] In the above examples, the program includes instructions (or software code) that, when loaded into a computer, cause the computer to perform one or more functions described in the embodiments. The program may be stored on a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, computer-readable medium or tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray disc or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The program may also be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, transitory computer-readable medium or communication medium includes electrical, optical, acoustic, or other forms of propagated signals.

[0069] The invention made by the inventor has been specifically described above based on the embodiments, but it goes without saying that the present invention is not limited to the above-described embodiments and various modifications are possible within the scope of the present invention. For example, although a belt conveyor has been described in the above embodiment, a roll conveyor may also be used. From the viewpoint of smoothing out wrinkles in the film, it is more preferable to use a belt conveyor.

[0070] In some embodiments, the film transport method includes moving a film transport table from a retracted position to a transport position, placing a film on the film transport table, and generating an air flow along the surface of the film transport table using an air flow generating device.

[0071] In some embodiments, the film manufacturing apparatus includes an extruder that melts and extrudes an input resin raw material, a die that is connected to the extruder and forms the molten resin into a film, The apparatus includes a cooling roll that cools the film-like molten resin extruded from the die and conveys a resin film formed by solidifying the molten resin; a longitudinal stretching machine that is located downstream of the cooling roll and that stretches the film longitudinally and sends it downstream; a feeding mechanism that includes a film conveying table on which the film is placed, which is movable between a retracted position and a conveying position, and an airflow generating device that generates an airflow along the surface of the film conveying table; and a transverse stretching machine that is located downstream of the feeding mechanism and that stretches the film transversely and sends it downstream. [Explanation of symbols]

[0072] 1. Film manufacturing equipment 10. Extruder 11 cylinders 13 Hopper 20 T-die 30 Cooler 40 Longitudinal stretching machine 50 Lateral stretching machine 60 Winder 70 Feed mechanism 71 Robot Mechanism 72 Lower roller mechanism 82a Molten Resin 83 Film 90 Meandering detection unit 500 Clip Device 501 Clip Closer 711 Conveyor Belt 712 Mounting part 715 Robot Arm 720 Lower roll stand 725 Lifting mechanism 729 Guide Roll 730 Lower stand 731 Conveyor Belt 80 Airflow Generator CR1~CR4 Cooling rolls R1~R11 roll RL1, RL2 rails RUR bottom right roll LUR Bottom Left Roll

Claims

1. a film transport table for placing a film thereon, the film transport table being movable between a retracted position and a transport position; an airflow generating device that generates an airflow along the surface of the film transport table; A film transporter comprising a feed mechanism including:

2. The film transport machine according to claim 1 , wherein the airflow generating device is configured to generate an airflow toward the surface of the film transport table, thereby causing the airflow to flow along the surface of the film transport table.

3. The film transporter according to claim 1 , wherein the film transport table has a belt conveyor capable of transporting the film.

4. 2. The film transporter according to claim 1, wherein the film transport table is a lower roll table having a plurality of rolls and capable of moving up and down.

5. A belt conveyor is provided above the lower roll table and is provided below the tip of the robot arm.

5. The film conveying machine according to claim 4, wherein the robot arm is configured to lower the tip thereof to grip the film between the belt conveyor and the lower roll table, and convey the film downstream by rotating the belt conveyor.

6. a longitudinal stretching machine provided in a longitudinal stretching region upstream of the film transport table, which longitudinally stretches the film and transports it downstream; The film transporter according to claim 1 , further comprising a transverse stretching machine provided in a transverse stretching region downstream of the film transport table, which transversely stretches the film and transports it downstream.

7. 2. The film transport of claim 1, further comprising a clip closer disposed downstream and spaced from the film transport platform.

8. 8. The film transport machine of claim 7, further comprising an auxiliary airflow generating device disposed between the film transport table and the clip closer, which generates an airflow from below toward the leading end of the film extending from the leading end of the film transport table toward the clip closer.

9. 2. The film transporter according to claim 1, wherein the airflow generating device is movable between a retracted position and a position where the airflow generating device generates an airflow on the surface of the film transport table at the transport position.

10. moving a film transport table from a retracted position to a transport position and placing a film on the film transport table; generating an airflow along a surface of the film transport table by an airflow generating device; A film transport method comprising:

11. an extruder that melts and extrudes the input resin raw material; a die connected to the extruder for forming the molten resin into a film; a cooling roll that cools the film-like molten resin extruded from the die and carries out a resin film in which the molten resin has solidified; a longitudinal stretching machine provided downstream of the cooling roll for longitudinally stretching the film and feeding the film downstream; a feeding mechanism including a film transport table for placing a film thereon, the film transport table being movable between a retracted position and a transport position, and an airflow generating device for generating an airflow along the surface of the film transport table; a transverse stretching machine that is provided downstream of the feeding mechanism and that transversely stretches the film and feeds it downstream.

Images