Packaging device and packaging material guide member

Abstract

To suppress packaging defect caused by an end part in the width direction of a sheet-like packaging material moving to the central side.SOLUTION: A packaging device includes: a supply part for supplying a sheet-like packaging material which continues in a supply direction; and a packaging processing part for performing packaging processing for packaging an object to be packaged by the packaging material supplied from the supply part. The packaging device also includes a packaging material guide member 23a around which the packaging material supplied from the supply part is wound, and which guides it so as to head toward the packaging processing part. The packaging material guide member 23a includes width direction end part center movement suppressing means 232 which suppresses an end part in the width direction of the packaging material moving to the width direction central side.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a packaging device and a packaging material guide member. [Background technology]

[0002] Conventionally, there is known a packaging device that includes a supply section that supplies a continuous sheet-like packaging material in a supply direction, and a packaging processing section that performs a packaging process to package an object to be packaged with the packaging material supplied from the supply section. As an example of this type of packaging device, Patent Document 1 describes a packaging device that has two film supply sections that supply a continuous sheet-like resin film, and a welding section (packaging processing section) that welds two sheets of film supplied from each of the two film supply sections to form a package.

[0003] The packaging device of Patent Document 1 includes a film guide member around which the film unwound from the unwinding roll of the film supply section is wound, guiding the film's path of movement toward the welding section. In the welding section, two films are stacked and welded along the length of the film, slightly inside both ends in the width direction. Furthermore, the front and rear portions of the welded portion along the length direction are welded and cut. This allows the formation of a bag-shaped package with four sides welded. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-37302 A [Patent Document 2] JP 2017-074975 A [Patent Document 3] JP 2015-151149 A Summary of the Invention [Problem to be solved by the invention]

[0005] In a packaging device similar to that described in Patent Document 1, defects in welding can occur, such as holes appearing in some of the welded parts along the longitudinal direction as described above, or the welded parts along the longitudinal direction themselves not being formed, resulting in a problem that makes it impossible to form a bag-shaped package. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a packaging device including a supply unit that supplies a continuous sheet-like packaging material in a supply direction, and a packaging processing unit that performs a packaging process of packaging an object to be packaged with the packaging material supplied from the supply unit, and a packaging material guide member around which the packaging material supplied from the supply unit is looped and which guides the packaging material toward the packaging processing unit, The supply unit has a first supply unit and a second supply unit which respectively supply the packaging materials, and the packaging processing unit has a widthwise outer bonding means which, in a state in which the first packaging material supplied from the first supply unit and the second packaging material supplied from the second supply unit are overlapped, bonds the widthwise outer bonding portions which are slightly inside the widthwise ends of the packaging materials in a line shape along the longitudinal direction of the packaging materials, The packaging material guide member is provided with a widthwise end portion of the packaging material. ,width direction of Center of the widthwise edge that prevents movement toward the center side The present invention provides a packaging device characterized by comprising a movement suppression means.

[0007] As a result of intensive research, the inventors of the present invention have found that the above-mentioned welding failure of the welding portion along the longitudinal direction is caused by the occurrence of center shifting, in which the end portion in the width direction of one of the two films moves toward the center in the width direction. When center shifting occurs, the end portion in the width direction of the film may reach a position in the width direction that is further inward than the position where the welding portion along the longitudinal direction is formed. In this state, even if an attempt is made to weld the welding portion along the longitudinal direction, it is not possible to weld the film that has been center shifted, resulting in packaging failure. Packaging defects caused by the widthwise ends of a sheet-like packaging material moving toward the center are a problem that can occur in any packaging material, regardless of whether the packaging material is a film or whether two sheets of packaging material are stacked and welded together. Effect of the Invention

[0008] According to the present invention, the width direction end center sideBy providing the movement suppression means, it is possible to prevent packaging defects caused by the widthwise ends of the sheet-like packaging material moving toward the center, thereby enabling good packaging processing to be performed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is an external perspective view of the packaging device according to the embodiment. [Diagram 2] FIG. 2 is a side view showing an outline of the internal structure of the packaging device according to the embodiment. [Diagram 3] FIG. [Figure 4] Illustration of three types of packages that can be obtained with the packaging device [Diagram 5] FIG. [Figure 6] 10A to 10C are explanatory diagrams of modified examples of the first guide shaft. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the same or equivalent components, members, and processes shown in each drawing will be given the same reference numerals, and duplicated explanations will be omitted as appropriate. Also, the dimensions of the members in each drawing will be enlarged or reduced as appropriate to facilitate understanding. Also, some of the members that are not important for explaining the embodiment will be omitted in each drawing.

[0011] Hereinafter, an embodiment of a packaging device according to the present invention will be described.

[0012] FIG. 1 is an external perspective view showing a packaging machine 1 according to the present invention. When a newspaper S folded in four is inserted with its final fold side S1 at the front through an insertion opening 2 provided on the top surface of the packaging machine 1, it is wrapped in resin film sheets (F1, F2) inside the device and the packaged item FP is discharged from a discharge opening 3 below and loaded onto a stacker 4. An operation panel 7 that can be operated by the user is provided on the top surface of the packaging machine 1. The operation panel 7 is composed of push button switches or a touch panel, etc., and allows the user to set the operation mode, etc. of the device.

[0013] Fig. 2 is a schematic diagram showing the internal configuration of the packaging machine 1 as seen from the direction of the arrow "A" in Fig. 1. As shown in Fig. 2, the packaging machine 1 includes a conveying and packaging unit 50 that conveys and packages objects to be packaged, such as newspapers S. A passage 5 is formed by the first guide plate 5a and the second guide plate 5b so as to guide the newspaper S inserted from the insertion opening 2 downward. Two film rolls 6 (first film roll 6a, second film roll 6b) are supported on each side of the passage 5. The film roll 6 is formed by winding a long thermoplastic resin film sheet such as polyethylene having a predetermined width around a core. The two film rolls 6 are stored in the device in a state in which the leading ends of the first film F1 led out from the first film roll 6a and the second film F2 led out from the second film roll 6b are welded together at the leading end welding line F3. The leading end welding line F3 is formed by welding the leading ends of the first film F1 and the second film F2 to each other in the previous welding operation. When mounting a film roll 6 that has not been welded together in the previous welding operation, the leading ends of the first film F1 and the second film F2 are fixed together with cellophane tape or the like, and a test paper feed is performed to form the leading end welding line F3.

[0014] FIG. 3 is an enlarged explanatory view of the transporting and packaging section 50. As shown in FIG. A welding and cutting mechanism 8 that welds and cuts the film F at a position that will become the rear end of the package FP is disposed near the upstream end of the conveying and packaging section 50. As the welding and cutting mechanism 8, a known mechanism can be used, such as, but not limited to, the same as that described in Patent Document 1. The newspaper S descending the passage 5 further descends while being sandwiched between the first film F1 and the second film F2 from both sides by pushing down the leading end welding line F3 with its leading end. As shown in FIG. 3, the welding and cutting mechanism 8 includes a welding and cutting heater 9 and a receiving stand 10, which are disposed on either side of the transport path through which the newspaper S passes while being sandwiched between the two films F. The welding and cutting heater 9 is attached to a moving block 11. The moving block 11 is capable of reciprocating in the direction of arrow "B" by a crank mechanism (not shown). This movement causes the welding and cutting heater 9 to reciprocate between a standby position where its leading end is separated from the receiving stand 10 and a welding position where its leading end comes into contact with the receiving stand 10.

[0015] The welding and cutting heater 9 is heated in a direction perpendicular to the conveying direction of the newspaper S (perpendicular to the paper surface of FIGS. 2 and 3). How to The welding direction (hereinafter referred to as the "width direction") is a direction extending for a length equal to or greater than the width of the film F. By sandwiching the first film F1 and the second film F2 in an overlapping manner between the tip of the welding and cutting heater 9 and the receiving stand 10, a welding line (F3, F4) is formed where the first film F1 and the second film F2 are welded over the entire width.

[0016] A shutter 12 is provided upstream of the welding and cutting heater 9. The shutter 12 is a plate-like member extending in the width direction and is rotatable around a rotation shaft 13. A pressing member 14 is provided on the rear side of the shutter 12. The pressing member 14 is formed integrally with an axially shaped support member 15. The support member 15 is inserted into a bracket 16 attached to the moving block 11 so as to be freely movable in the axial direction. A spring 17 is interposed between the bracket 16 and the pressing member 14.

[0017] When the welding and cutting heater 9 is in the standby position, the stopper provided on the support member 15 is caught by the bracket 16, and the free end side of the shutter 12 is rotated downward by its own weight. When the welding and cutting heater 9 moves to the welding position, the bracket 16, the support member 15, and the pressing member 14 move in the same direction together with the welding and cutting heater 9, and the pressing member 14 presses the back surface of the shutter 12 to rotate the shutter 12. When the free end of the shutter 12 contacts the receiving base 10, the spring 17 is compressed thereafter. Furthermore, when the welding and cutting heater 9 reaches the welding position, a locking member (not shown) presses the back surface of the shutter 12. With this configuration, the shutter 12 closes the transport path of the newspaper S during welding and is locked so that it cannot be opened even if it is pushed from the passage 5 side, so that the next newspaper S is prevented from entering the downstream side of the shutter 12 while the rear end welding line F4 of the film F that packages the previous newspaper S is being welded.

[0018] 2 and 3, downstream of the welding and cutting mechanism 8 in the conveying and packaging section 50, conveyor belts 19 (19a, 19b) that convey the newspaper S further downstream are provided. The conveyor belts 19 include a first conveyor belt 19a that contacts one side of the newspaper S with the first film F1 sandwiched therebetween, and a second conveyor belt 19b that contacts the other side of the newspaper S with the second film F2 sandwiched therebetween.

[0019] The conveying and packaging section 50 is provided with two side welding heaters 20, one on each side of the first conveyor belt 19a in the width direction (front-rear direction in Figs. 2 and 3). The side welding heaters 20 are shaped to extend long along the conveying direction of the newspapers S. Two side welding receiving trays 21 are provided, one on each side of the second conveyor belt 19b in the width direction, at positions facing the side welding heaters 20 across the conveying path of the newspapers S.

[0020] The side welding heater 20 can be moved by a drive mechanism (not shown) between a standby position away from the side welding receiving stand 21 and a welding position in contact with the side welding receiving stand 21. By overlapping and sandwiching the first film F1 and the second film F2 between the side welding heater 20 and the side welding receiving stand 21, the first film F1 and the second film F2 are welded to each other on both sides in the width direction of the newspaper S, forming a welding line ("side welding line F5" described later) along the conveyance direction of the newspaper S.

[0021] The packaging machine 1 is provided with three sensors (P1, P2, P3) capable of detecting the presence or absence of newspapers S passing through the conveying path. The first sensor P1 is provided upstream of the welding and cutting mechanism 8, the second sensor P2 is provided downstream of the welding and cutting mechanism 8, and the third sensor P3 is provided near the downstream end of the side welding heater 20. Each of the three sensors (P1, P2, P3) is an optical sensor composed of a light emitting sensor and a light receiving sensor. Since the first film F1 and the second film F2 are transparent, the passage of the leading or trailing end of the newspaper S can be detected by using these optical sensors to detect the presence or absence of the newspaper S sandwiched between the first film F1 and the second film F2.

[0022] When a user inserts a newspaper S into the packaging machine 1 so that the final fold side S1 is at the front, the packaging machine 1 detects the passage of the leading edge (final fold side S1) of the inserted newspaper S with the first sensor P1 and starts driving the conveyor belt 19. At this time, the newspaper S presses down the first film F1 and the second film F2 with the final fold side S1 approximately aligned with the leading edge welding line F3 of the first film F1 and the second film F2. As a result, the newspaper S sandwiched between the first film F1 and the second film F2 is sandwiched between the first conveyor belt 19a and the second conveyor belt 19b and conveyed downstream.

[0023] When the second sensor P2 detects the passage of the rear end of the newspaper S, the conveyor belt 19 is stopped. Next, the welding / cutting heater 9 and the side welding heater 20 are moved from the standby position to the welding position, and the first film F1 and the second film F2 are sandwiched between the welding / cutting heater 9 and the receiving stand 10, and between the side welding heater 20 and the side welding receiving stand 21, respectively, for a predetermined time and welded. After that, only the side welding heater 20 is returned to the standby position, and driving of the conveyor belt 19 is resumed. At this time, the first film F1 and the second film F2 remain sandwiched between the welding and cutting heater 9 and the receiving table 10 on the upstream side of the newspaper S. By driving the conveyor belt 19 in this state, the first film F1 and the second film F2 are pulled downstream in the conveying direction, and the first film F1 and the second film F2 can be cut at the portion sandwiched between the welding and cutting heater 9 and the receiving table 10. The package FP, in which the newspaper S conveyed by the conveyor belt 19 is wrapped in the film F, is discharged from the discharge port 3 and accumulated in the stacker 4.

[0024] FIG. 3 shows a state in which the first film F1 and the second film F2 are sandwiched between the welding and cutting heater 9 and the receiving stand 10, and between the side welding heater 20 and the side welding receiving stand 21, and are welded. Fig. 4 is an explanatory diagram of three types of packages FP that can be obtained by changing the control conditions of the packaging operation in the packaging machine 1. As described with reference to Fig. 3, in the first packaging control in which the welding / cutting heater 9 and the side welding heater 20 are simultaneously moved to the welding position, the package FP shown in Fig. 4(a) can be obtained.

[0025] As shown in FIG. 3, when the welding and cutting heater 9 and the side welding heater 20 are moved to the welding position, the position of the leading edge welding line F3 in the conveying direction is within the range between the side welding heater 20 and the side welding receiving stand 21. Meanwhile, the upstream end of the side welding heater 20 and the welding and cutting heater 9 are separated. In this state, the welding and cutting heater 9 welds the first film F1 and the second film F2 at the trailing edge side (upstream side) of the newspaper S to form a trailing edge welding line F4, and at the same time, the side welding heater 20 forms side welding lines F5 (see FIG. 4(a)) on both sides of the newspaper S. Next, by restarting conveyance by the conveyor belt 19, the first film F1 and the second film F2 are cut at the trailing edge welding line F4 (the trailing edge welding line F4 formed by cutting becomes the leading edge welding line F3 for the newspaper S to be inserted next).

[0026] 4(a), a package FP that can be obtained by such a first packaging control has a shape in which side welding lines F5 formed on both sides of the newspaper S intersect with the leading end welding line F3 but do not intersect with the trailing end welding line F4. That is, a package FP can be obtained in which a non-welded portion F6 that is not welded between the upstream end of the side welding line F5 and the trailing end welding line F4 is formed on the side opposite to the leading end (final fold side S1) of the newspaper S.

[0027] Next, a second packaging control for obtaining the package FP shown in FIG. 4(b) will be described. In the second packaging control, when the second sensor P2 detects the passage of the rear end of the newspaper S and stops the conveyor belt 19, only the welding and cutting heater 9 is moved from the standby position to the welding position. As a result, the first film F1 and the second film F2 are sandwiched between the welding and cutting heater 9 and the receiving stand 10 for a predetermined time, and a first welding is performed. At this stage, the side welding heater 20 remains in the standby position. Next, the driving of the conveyor belt 19 is resumed, and the first film F1 and the second film F2 are cut at the portion where the first film F1 and the second film F2 are sandwiched between the welding and cutting heater 9 and the receiving stand 10. Thereafter, the conveyor belt 19 is stopped at the timing when a predetermined amount of the newspaper S is conveyed, and the side welding heater 20 is moved from the standby position to the welding position. Then, a second welding is performed, where the first film F1 and the second film F2 are sandwiched between the side welding heater 20 and the side welding receiving stand 21 for a predetermined time and welded. Thereafter, the side welding heater 20 is returned to the standby position, the driving of the conveyor belt 19 is resumed, and the package FP, in which the newspaper S is wrapped in the film F, is discharged from the discharge opening 3 and accumulated in the stacker 4.

[0028] In the second packaging control, during the first welding, the first film F1 and the second film F2 are sandwiched and welded between the welding and cutting heater 9 and the receiving stand 10. By this first welding, the first film F1 and the second film F2 are welded by the welding and cutting heater 9 on the upstream side of the rear end of the newspaper S, forming the rear end welding line F4 shown in FIG. After the first welding, the conveyor belt 19 is driven to convey the newspaper S to a position where both the leading end welding line F3 and the trailing end welding line F4 are positioned in the conveying direction within the range sandwiched between the side welding heater 20 and the side welding receiving stand 21, the conveyor belt 19 is stopped, and the second welding is performed. Therefore, at the time of the second welding, both the leading end welding line F3 and the trailing end welding line F4 are positioned within the range sandwiched between the side welding heater 20 and the side welding receiving stand 21. By performing the second welding in this state, the side welding heater 20 forms side welding lines F5 on both sides of the newspaper S. After the second welding, the side welding heater 20 is moved to the standby position, the conveyor belt 19 is restarted to convey the package FP to the discharge port 3.

[0029] In the package FP that can be obtained by this second packaging control, as shown in Fig. 4(b), the side welding lines F5 formed on both sides of the newspaper S cross both the leading end welding line F3 and the trailing end welding line F4. This makes it possible to obtain a package FP in which welding lines are formed without gaps along the four sides of the newspaper S.

[0030] Next, a third packaging control for obtaining the package FP shown in FIG. 4(c) will be described. In the third packaging control, when the second sensor P2 detects the passage of the rear end of the newspaper S and stops the conveyor belt 19, only the welding and cutting heater 9 is moved from the standby position to the welding position. As a result, the first welding is performed in which the first film F1 and the second film F2 are sandwiched between the welding and cutting heater 9 and the receiving stand 10 for a predetermined time. At this stage, the side welding heater 20 remains in the standby position. Next, the driving of the conveyor belt 19 is resumed, and the first film F1 and the second film F2 are cut at the portion where the first film F1 and the second film F2 are sandwiched between the welding and cutting heater 9 and the receiving stand 10. Thereafter, the conveyor belt 19 is stopped at the timing when the newspaper S is conveyed by a predetermined amount after the third sensor P3 detects the passage of the front end of the newspaper S, and the side welding heater 20 is moved from the standby position to the welding position. Then, the second welding is performed in which the first film F1 and the second film F2 are sandwiched between the side welding heater 20 and the side welding receiving stand 21 for a predetermined time and welded. Thereafter, the side welding heater 20 is returned to the standby position, the driving of the conveyor belt 19 is resumed, and the package FP, in which the newspaper S is wrapped in the film F, is discharged from the discharge opening 3 and accumulated in the stacker 4.

[0031] In the third packaging control, in the first welding, the first film F1 and the second film F2 are sandwiched and welded between the welding and cutting heater 9 and the receiving stand 10. In this first welding, the first film F1 and the second film F2 are welded by the welding and cutting heater 9 on the upstream side of the rear end of the newspaper S, forming the rear end welding line F4 shown in FIG. After the first welding, the conveyor belt 19 is driven to convey the newspaper S to a position downstream of the range where the leading end welding line F3 is sandwiched between the side welding heater 20 and the side welding receiving stand 21, the conveyor belt 19 is stopped, and the second welding is performed. Specifically, after the first welding, the conveyor belt 19 is started to be driven, and after the passage of the leading end of the newspaper S is detected by the third sensor P3, the newspaper S is conveyed a predetermined amount and the conveyor belt 19 is stopped. Therefore, at the time of the second welding, the position of the trailing end welding line F4 in the conveying direction is within the range sandwiched between the side welding heater 20 and the side welding receiving stand 21, but the position of the leading end welding line F3 in the conveying direction is downstream of the range sandwiched between the side welding heater 20 and the side welding receiving stand 21. By performing the second welding in this state, the side welding heater 20 forms side welding lines F5 on both sides of the newspaper S. After the second welding, the side welding heater 20 is moved to the standby position, and the conveyor belt 19 resumes conveyance to send the package FP to the discharge port 3.

[0032] 4(c), the package FP obtained by this third packaging control has side welding lines F5 formed on both sides of the newspaper S that intersect with the rear end welding line F4 but do not intersect with the leading end welding line F3. This makes it possible to obtain a package FP in which a leading end unwelded portion F7 that is not welded between the downstream end of the side welding line F5 and the leading end welding line F3 is formed on the leading end (final fold edge S1) side of the newspaper S.

[0033] Next, a moving path of the film F that is supplied from the two film rolls 6 (6a, 6b) serving as a supply unit to the conveying and packaging unit 50 serving as a packaging processing unit will be described with reference to FIGS. As shown in Fig. 2, a first support roller 22a and a second support roller 22b are disposed below the two film rolls 6 (6a, 6b), respectively. A first guide shaft 23a and a second guide shaft 23b are disposed on the inside (the conveying path side of the newspaper S) of the two support rollers 22 (22a, 22b) in Fig. 2. The two guide shafts 23 are mounted via bearings so as to be rotatable relative to the housing of the device main body of the packaging machine 1.

[0034] The packaging machine 1 is provided with a roll shaft guide groove (not shown) that supports the shaft of the film roll 6 (6a, 6b) so that it can move in the vertical direction, and the film roll 6 (6a, 6b) stops at a position where its outer circumferential surface abuts against the support rollers 22 (22a, 22b). Therefore, when the diameter of the film roll 6 (6a, 6b) becomes smaller due to consumption of the film F, the shaft of the film roll 6 (6a, 6b) moves down along the roll shaft guide groove. On the other hand, the position where the film roll 6 (6a, 6b) abuts against the support rollers 22 (22a, 22b) is constant. With this configuration, the position where the film F is unwound from the film roll 6 (6a, 6b) can be kept constant.

[0035] The first film F1 unwound from the contact portion between the first film roll 6a and the first support roller 22a is looped around the first guide shaft 23a, passes between the free end of the shutter 12 and the receiving platform 10, and is guided to reach the transporting and packaging section 50. Similarly, the second film F2 unwound from the contact portion between the second film roll 6b and the second support roller 22b is looped around the second guide shaft 23b, passes between the free end of the shutter 12 and the receiving platform 10, and is guided to reach the transporting and packaging section 50. Then, as described above, the leading ends of the first film F1 and the second film F2 that have passed between the free end of the shutter 12 and the receiving platform 10 have been welded together in advance in the previous packaging operation, forming a leading end weld line F3.

[0036] In a packaging device having a configuration similar to that of the packaging machine 1, the leading end weld line F3 formed in the previous packaging operation may peel off, causing a hole in the welded portion, resulting in leading end cracking. The present inventors conducted extensive research to prevent such leading end cracking, and discovered that the frequency of leading end cracking can be reduced by changing the settings of the arrangement of each component, etc., to reduce the tension of the first film F1. As an example of changing the settings, it was confirmed that the tension of the first film F1 can be reduced by shifting the position of the first guide shaft 23a downward.

[0037] However, when the tension of the first film F1 is set to be weak, poor welding of the side welding line F5 may occur, such as holes being formed in the side welding line F5 or the side welding line F5 itself not being formed. The present inventors have conducted extensive research into the welding failure of the side welding line F5 and have found the following causes. That is, when the tension is weakened, the end of the first film F1 in the width direction moves toward the center in the width direction while the first film F1 unwound from the first film roll 6a reaches the conveying and packaging section 50, and the film F is shifted toward the center in the width direction. If the end of the first film F1 in the width direction moves to the inside in the width direction beyond the side welding heater 20 due to such shifting toward the center, the only film F sandwiched between the side welding heater 20 and the side welding receiving base 21 will be the second film F2. As a result, only the second film F2 is heated, and welding between the first film F1 and the second film F2 cannot be performed, and poor welding of the side welding line F5 occurs.

[0038] Next, the features of the packaging machine 1 of this embodiment will be described. In the packaging machine 1, a widthwise end of a first film F1, which is a packaging material, is guided by a first guide shaft 23a, which is a packaging material guide member. ,width direction of Center of the widthwise edge that prevents movement toward the center side Equipped with a movement suppression means.

[0039] FIG. 5 is an explanatory diagram of the first guide shaft 23a. 5, first guide shaft 23a is a metal shaft having a uniform diameter (D1) and tape application sections 232 formed by wrapping and applying adhesive tape around both ends of shaft main body 231 in the width direction (left-right direction in FIG. 5). First guide shaft 23a is attached to the housing of the device main body of packaging machine 1 such that shaft central axis 23c, which is the central axis of shaft main body 231, is parallel to the width direction of packaging machine 1.

[0040] The dimensions shown in FIG. Shaft length L1: 574.6 [mm] Distance between outer edges of tape L2: 474.6 mm Distance from shaft end to tape end L3: 50 [mm] Tape width L4: 50 [mm] Shaft diameter D1: 8.0 [mm]

[0041] The film width (length in the width direction) of the film F used as the first film F1 and the second film F2 is 490 [mm] or 495 [mm]. Either film width is longer than the distance L2 between the outer tape ends described above. Therefore, when the first film F1 is wrapped around the first guide shaft 23a, the two tape application portions 232 are positioned inside both ends of the first film F1 in the width direction.

[0042] The shaft body 231 of the first guide shaft 23a is a steel (SUM22) shaft member that has been subjected to a surface treatment of electroless nickel plating. The adhesive tape attached to the tape attachment portion 232 is an electrostatic removal tape (electrostatic removal tape manufactured by Nippon Vilene Co., Ltd., model number: SDT255). The adhesive tape attached to the tape attachment portion 232 has a widthwise length (tape width L4) of 50 mm and a circumferential length (the direction in which it is wrapped around the shaft main body 231) of 25 mm. Because the length of the cylindrical circumferential surface of the shaft main body 231 is approximately 25.12 mm (D1×3.14), when an adhesive tape with a circumferential length of 25 mm is attached to the shaft main body 231, a gap of approximately 0.1 mm is formed in the circumferential direction. However, this prevents the adhesive tapes from overlapping with each other, and prevents the adhesive tapes from peeling off from the overlapping portions.

[0043] It was confirmed that by attaching an adhesive tape made of an electrostatic removal tape near the width direction end of the shaft main body 231 made of a steel shaft member to form the tape attachment portion 232, it is possible to prevent the width direction end of the first film F1 from moving toward the width direction center. This is believed to be due to the following reasons. That is, the tape attachment portion 232 in which the adhesive tape is attached to the shaft main body portion 231 becomes a large diameter portion whose radius is larger by the thickness of the adhesive tape (0.5 [mm]). In the portion of the first film F1 that is wound around the first guide shaft 23a, the portion wound around the large diameter portion has a longer passage path for the first film F1 than other portions. As the passage path becomes longer, the vicinity of the end portion in the width direction of the first film F1 is in a pulled state, and the tension is stronger than the vicinity of the center in the width direction. In the portion where the tension of the first film F1 is stronger, the contact pressure with the first guide shaft 23a becomes higher, and the frictional force between the first film F1 and the first guide shaft 23a also becomes larger. It is considered that the increase in frictional force makes it difficult for the vicinity of the end portion in the width direction of the first film F1 to move, and the movement of the end portion in the width direction of the first film F1 toward the center in the width direction can be suppressed. In addition, the surface of the tape application portion 232 has a higher coefficient of friction with the surface of the first film F1 than the surface of the shaft main body portion 231, making it more difficult to move, which may have prevented the widthwise ends of the first film F1 from moving toward the center in the widthwise direction.

[0044] 5, the problem of tip cracking described above did not worsen even when the tape attachment portion 232 was provided on the shaft main body 231. This is thought to be because the diameter of the first guide shaft 23a remained at D1 except near the end in the width direction where the tape attachment portion 232 was provided, and the weakened tension setting of the first film F1 could be maintained.

[0045] In the above description, when the first film F1 is caused to deviate from the center and welding defects occur, the first guide shaft 23a is side In the case where the second film F2 is moved toward the center and welding defects occur, the second guide shaft 23b is moved toward the center of the width direction end portion. side By providing the movement suppression means, it is possible to suppress the occurrence of poor welding caused by being positioned toward the center.

[0046] [Modifications] Figure 6 shows the center of the width direction edge side 11A to 11C are explanatory diagrams of various modified examples of a first guide shaft 23a equipped with a movement suppressing means.

[0047] [Variation 1] Fig. 6(a) is an explanatory diagram of Modification 1, in which a steel shaft member is processed to form a large diameter shaft portion 234 near the width direction end and a small diameter shaft portion 235 including the width direction center. In the first guide shaft 23a of Modification 1 shown in Fig. 6(a), the tension of the first film F1 in the portion wrapped around the large diameter shaft portion 234 is strong, and it is possible to suppress the movement of the width direction end of the first film F1 toward the width direction center. In addition, it is possible to maintain a weak tension setting for the first film F1 in the portion wrapped around the small diameter shaft portion 235, and it is also possible to suppress the defect of tip cracking.

[0048] [Modification 2] FIG. 6(b) is an explanatory diagram of Modification 2, which differs from the first guide shaft 23a shown in FIG. 6(a) in that the shaft large diameter portion 234 has a shape in which the radius increases toward the outside in the width direction.

[0049] [Modification 3] 6(c) is an explanatory diagram of Modification 3, which is configured to include an end clamping roller 236 that clamps the end in the width direction of the first film F1, which is wrapped around a first guide shaft 23a having a uniform diameter in the width direction, between the first guide shaft 23a and the end clamping roller 236. By clamping the end in the width direction of the first film F1 between the end clamping roller 236 and the first guide shaft 23a, it is possible to prevent the end in the width direction of the first film F1 from moving toward the center in the width direction. A leaf spring may be disposed in place of the end clamping roller 236 shown in FIG. 6(c), and the end in the width direction of the first film F1 may be clamped between the leaf spring and the first guide shaft 23a.

[0050] Width direction end center according to the present invention sideThe movement suppressing means is not limited to the configurations described in the above-mentioned embodiment and each modified example, and may be any means that allows the end portion in the width direction of the packaging material to move toward the center in the width direction. side The defect suppressed by the movement suppressing means is not limited to a defect near the center where both or one of the widthwise ends move toward the center. The movement suppressing means suppresses a defect where the packaging material shifts in the width direction such that one widthwise end moves toward the center and the other widthwise end moves further outward in the width direction. side It may also be a movement suppression means.

[0051] In the above-described embodiment, the packaging machine 1 is configured to cover the inserted rectangular sheet, newspaper S, with a resin film sheet and seal the periphery of all four sides of the newspaper S to package it. The object to be packaged by the packaging device according to the present invention is not limited to rectangular sheet-like objects such as newspapers S. In addition, it is not limited to those in which the periphery of all four sides of the sheet is sealed, and it may be an object that is packaged with one of the four sides open. Furthermore, the packaging material is not limited to resin film sheets, and may be paper, cloth, or any other material that can package the object to be packaged.

[0052] The packaging machine 1 described above has a vertical conveyance configuration in which the newspaper S, which is the packaging object, is wrapped in a resin film, which is the packaging material, while being conveyed from above to below, but the packaging device to which the present invention can be applied is not limited to this. For example, even in a horizontal conveyance configuration in which the newspaper S is wrapped while being conveyed horizontally, as in the packaging device described in Patent Document 2, the packaging material guide member may be positioned at the center of the widthwise end. side A configuration including a movement suppressing means is applicable. Furthermore, the above-mentioned packaging machine 1 is configured to package the object to be packaged by overlapping and welding two sheets of resin film, but the packaging device to which the present invention is applicable is not limited to this. For example, even in a packaging device that folds a sheet of resin film and packages the object by welding the overlapping portion, such as the packaging device described in Patent Document 3, the above-mentioned packaging material guide member may be positioned at the center of the width direction end. sideThe configuration including the movement suppressing means is also applicable to a packaging device that uses three or more resin films for packaging.

[0053] The embodiments of the present invention are not limited to the above-described embodiments and variations, and various design changes and other variations may be made to the embodiments based on the knowledge of those skilled in the art, and such variations may also be included in the scope of the present invention.

[0054] The above description is merely an example, and each of the following aspects provides unique effects.

[0055] [Aspect 1] In a packaging device such as a packaging machine 1, which includes a supply unit such as a film roll 6 that supplies a sheet-like film F or other packaging material that is continuous in a supply direction, and a packaging processing unit such as a conveying and packaging unit 50 that performs packaging processing to package an object to be packaged such as a newspaper S with the packaging material supplied from the supply unit, and which includes a packaging material guide member such as a guide shaft 23 around which the packaging material supplied from the supply unit is wound and guided toward the packaging processing unit, is the width direction The tape attachment portion 232, the large diameter shaft portion 234, the end clamping roller 236, etc. are prevented from moving toward the center. side The present invention is characterized by including a movement suppression means. This makes it possible to prevent packaging defects caused by the widthwise ends of the sheet-like packaging material shifting toward the center, thereby enabling good packaging processing to be performed.

[0056] [Aspect 2] In the packaging device of aspect 1, the supply section includes a first supply section such as a first film roll 6a and a second supply section such as a second film roll 6b, which each supply packaging material, and the packaging processing section performs packaging processing by sandwiching an item to be packaged between a first packaging material such as a first film F1 supplied from the first supply section and a second packaging material such as a second film F2 supplied from the second supply section, and bonding the first packaging material and the second packaging material by welding or other means. In a configuration in which a first packaging material and a second packaging material are overlapped and glued together, if the widthwise ends of one or both of the two packaging materials move toward the widthwise center, one or both of the two packaging materials will not be present at the position where the widthwise outer adhesive portions, such as the side welding line F5, are glued, which may result in poor adhesion such as poor welding. In contrast, in the packaging device of the second embodiment, the first packaging material and the second packaging material are overlapped and bonded together, and the packaging material guide member is positioned at the center of the widthwise end. side The inclusion of the movement suppression means makes it possible to prevent packaging defects caused by the widthwise ends of the packaging material moving toward the center, thereby enabling good packaging processing to be performed.

[0057] [Aspect 3] In the packaging device of the first or second aspect, the packaging material guide member is Packaging material guide parts The shaft has a cylindrical portion such as a shaft main body 231, the periphery of which is wrapped with a packaging material, and the central axis of the shaft central axis 23c, etc. is parallel to the width direction. According to this, the packaging material guide member is provided with a cylindrical portion at the center of the width direction end. side By adding the movement suppression means, it is possible to prevent packaging defects caused by the widthwise ends of the sheet-like packaging material moving toward the center.

[0058] Aspect 4 In the packaging device of the third aspect, the packaging material guide member is characterized in that the cylindrical portion is rotatable about the central axis by a configuration in which the cylindrical portion is assembled to the housing via a bearing. According to this, the packaging material guide member is provided with a member having a rotatable cylindrical portion, and the center of the width direction end side By adding the movement suppression means, it is possible to prevent packaging defects caused by the widthwise ends of the sheet-like packaging material moving toward the center.

[0059] Aspect 5 In the packaging device of embodiment 3 or 4, as a means for suppressing movement of the widthwise end portion toward the center, the cylindrical portion of the packaging material guide member is characterized in that it has a shape having a large diameter portion, such as a tape application portion 232 or a large diameter shaft portion 234, on the widthwise end side, which has a larger radius than the widthwise center portion. This allows the tension in the portion of the packaging material that is wrapped around the large diameter portion to be increased, making it possible to prevent the widthwise end portion of the packaging material that is wrapped around this large diameter portion from moving toward the center.

[0060] Aspect 6 The packaging device of the fifth embodiment is characterized in that a large diameter portion such as the tape application portion 232 is formed by wrapping a tape member such as an adhesive tape around a cylindrical member. According to this, the center of the width direction end side It is possible to easily realize a packaging material guide member having a large diameter portion that serves as the movement suppressing means.

[0061] Aspect 7 The packaging device of the sixth aspect is characterized in that a steel material such as SUM22 is used as the cylindrical member, and an anti-static tape is used as the tape member. According to this, the inventors confirmed the effect side It is possible to realize a packaging material guide member having a movement suppressing means.

[0062] Aspect 8 In the packaging device of the fifth aspect, the large diameter portion is of The shape has a radius that increases toward the outside. This makes it possible to realize a packaging material guide member having a large diameter portion, such as a large diameter shaft portion 234 having an inclined portion, as shown in FIG. 6(b).

[0063] Aspect 9 In the packaging device according to any one of aspects 1 to 8, the packaging material is a resin film such as polyethylene, and the packaging processing unit performs packaging processing by heating and welding the packaging material. In the case of a configuration in which the packaging process is performed by welding the packaging material, the side welding heater 20 Welding etc. In contrast, the packaging device of the ninth aspect can prevent the end portions of the resin film in the width direction from moving toward the center in the width direction, thereby preventing poor welding of the resin film and enabling good packaging processing.

[0064] Aspect 10 A member to be attached to a packaging device such as a packaging machine 1, which includes a supply unit such as a film roll 6 that supplies a packaging material such as a sheet-like film F that is continuous in the supply direction, and a packaging processing unit such as a conveying and packaging unit 50 that performs a packaging process to package an object to be packaged such as a newspaper S with the packaging material supplied from the supply unit, and in a packaging material guide member such as a guide shaft 23 around which the packaging material supplied from the supply unit is wound and which guides the packaging material toward the packaging processing unit, a tape application unit 232, a large diameter shaft portion 234, or an end clamping roller 236, etc., which prevents the end in the width direction of the packaging material from moving toward the center in the width direction side The present invention is characterized by including a movement suppression means. [Explanation of symbols]

[0065] 1: Packaging equipment 5a: First guide plate 5b: Second guide plate 6: Film roll 6a: First film roll 6b: Second film roll 7: Operation panel 8: Welding and cutting mechanism 9: Welding and cutting heater 19: Conveyor belt 19a: First conveyor belt 19b: Second conveyor belt 20: Side welding heater 22: Support roller 22a: First support roller 22b: Second support roller 23: Guide shaft 23a: First guide shaft 23b: Second guide shaft 23c: Shaft center axis 50: Transport and packaging department 231: Shaft body 232: Tape attachment section 234: Large diameter shaft 235: Small diameter shaft 236: End clamping roller F: Film F1: First film F2: Second film FP:Package

Claims

1. A supply section that supplies a continuous sheet-shaped packaging material in a supply direction; a packaging processing unit that performs packaging processing of packaging an object to be packaged with the packaging material supplied from the supply unit, A packaging device including a packaging material guide member around which the packaging material supplied from the supply unit is wound and which guides the packaging material toward the packaging processing unit, The supply unit includes a first supply unit and a second supply unit that respectively supply the packaging material, the packaging processing section has a widthwise outer bonding means for bonding, in a state in which a first packaging material supplied from the first supply section and a second packaging material supplied from the second supply section are overlapped with each other, a widthwise outer bonding portion that is slightly inside an end portion of the packaging material in the width direction, in a line shape along a longitudinal direction of the packaging material, A packaging device characterized in that the packaging material guide member is provided with a width direction end center movement suppression means for suppressing movement of the width direction end of the packaging material toward the center in the width direction.

2. In the packaging device of claim 1, The packaging processing section has a rear end bonding means for bonding the first packaging material and the second packaging material in a state where the first packaging material and the second packaging material are overlapped with each other, at the rear side in the conveying direction of the packaging object in a line shape extending in the width direction, the rear end bonding means has a movable member positioned on the side of the first packaging material, sandwiching the overlapping packaging materials, and a receiving member positioned on the side of the second packaging material, and the movable member is moved toward the receiving member to sandwich and bond the two packaging materials between the movable member and the receiving member; A packaging device characterized in that the packaging material guide member equipped with the width direction end center side movement suppression means is a member that guides the first packaging material.

3. In the packaging device according to claim 1 or 2, The packaging processing unit is a packaging device characterized by performing the packaging process by sandwiching the item to be packaged between the first packaging material and the second packaging material and gluing the overlapping portions of the first packaging material and the second packaging material.

4. The packaging device according to any one of claims 1 to 3, The packaging device according to claim 1, wherein the packaging material guide member has a cylindrical portion around whose circumferential surface the packaging material is wound, and whose central axis is parallel to a width direction.

5. The packaging device according to claim 4, The packaging device, wherein the packaging material guide member has a cylindrical portion that is rotatable about the central axis.

6. In the packaging device according to claim 4 or 5, A packaging device characterized in that, as a means for suppressing movement of the widthwise end portion toward the center, the cylindrical portion of the packaging material guide member is shaped to have a large diameter portion on the widthwise end side having a larger radius than the widthwise center portion.

7. 7. The packaging device of claim 6, A packaging device comprising: a cylindrical member having a tape member wound therearound to form the large diameter portion.

8. The packaging device according to claim 7, A packaging device comprising: a cylindrical member made of steel; and a tape member made of anti-static tape.

9. A packaging device according to any one of claims 1 to 8, The packaging device is characterized in that the packaging material is a resin film, and the packaging processing section performs the packaging process by heating and welding the packaging material.

10. A packaging material guide member is attached to a packaging device including a supply unit that supplies a continuous sheet-like packaging material in a supply direction, and a packaging processing unit that performs a packaging process of packaging an object to be packaged with the packaging material supplied from the supply unit, the packaging material guide member being adapted to guide the packaging material supplied from the supply unit toward the packaging processing unit, The supply section of the packaging device includes a first supply section and a second supply section each supplying the packaging material, The packaging processing unit of the packaging device has a widthwise outer bonding means for bonding, in a state in which a first packaging material supplied from the first supply unit and a second packaging material supplied from the second supply unit are overlapped with each other, a widthwise outer bonding portion that is slightly inside an end portion of the packaging material in the width direction, in a line shape along a longitudinal direction of the packaging material, A packaging material guide member comprising a width direction end center movement suppression means for suppressing movement of the width direction end of the packaging material toward the center in the width direction.

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