Defect Detection Device and Bag Making Machine

Abstract

The present application provides a defect detection device and a bag-making machine for detecting defects in bag-making, which are difficult to scratch the constituent elements of a bag such as the main body material. The defect detection device includes a detection unit and a moving mechanism. The detection unit includes: a support body, an arm supported by the support body so as to be able to swing around a pivot, and a sensor for detecting the relative displacement of the arm with respect to the support body. The arm includes a contact member. The moving mechanism moves the contact member away from the conveyance plane during the conveyance of the main body material, and during the stop of the main body material, moves the contact member to the conveyance plane and then moves away from the conveyance plane. The defect detection device further includes a determination unit that determines whether there is a defect in bag-making based on data from the sensor.

Description

Technical Field

[0001] The present application relates to a defect detection device for detecting defects in bag making and a bag making machine including such a defect detection device. Background Art

[0002] For example, a bag making machine conveys two or more continuous planar main body materials (main constituent elements of a bag), and supplies accessory constituent elements such as side gusset materials and bottom gusset materials to a specified position of the main body materials, and sequentially manufactures bags from the main body materials and the accessory constituent elements.

[0003] Whether the accessory constituent elements exist in an appropriate state at an appropriate position of the main body material can be determined by using a change in the thickness of the constituent elements. As an example, if the side gusset material is appropriately arranged at a specified position relative to the main body material, the thicknesses of the main body material and the side gusset material are detected at the specified position. On the other hand, if the side gusset material is arranged offset relative to the main body material, the thickness of the main body material is detected at the specified position. Thus, a defect in bag making causes a change in the thickness at a specific position, and by utilizing this phenomenon, the defect can be detected.

[0004] Such a technique has been widely applied in bag making machines. In Patent Document 1, detection of a change in thickness is used for detecting a foreign object attached to a bag. In Patent Document 2, detection of a change in thickness is used for detecting a seam of a main body material.

[0005] The devices of Patent Document 1 and Patent Document 2 both perform detection while the main body material is being conveyed. In these devices, a contact member required for detection such as a roller must always be in contact with the main body material, and thus the main body material is easily scratched.

[0006] An object of the present application is to provide a defect detection device and a bag making machine for detecting defects in bag making, which are less likely to scratch constituent elements of a bag such as a main body material.

[0007] Prior Art Documents

[0008] Patent Documents

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 2008-207916

[0010] Patent Document 2: Japanese Patent Application Laid-Open No. 10-19557 Summary of the Invention

[0011] According to an embodiment of the present application, there is provided a defect detection device provided in a bag making machine that intermittently conveys a continuous planar main body material in its length direction, for detecting defects in bag making.

[0012] The defect detection device includes a detection unit,

[0013] The detection unit includes:

[0014] A support;

[0015] An arm supported by the support so as to be swingable around a pivot; and

[0016] A sensor for detecting a relative displacement of the arm with respect to the support.

[0017] The arm includes a first contact member and a second contact member provided at a predetermined angular interval from each other with the pivot as the center.

[0018] The defect detection device further includes a moving mechanism for moving the detection unit between a first position where the first and second contact members are separated from the conveyance plane of the main body material and a second position where the first and second contact members reach the conveyance plane. The moving mechanism positions the detection unit at the first position during conveyance of the main body material, and moves the detection unit to the second position and then moves from the second position during stoppage of the main body material.

[0019] The defect detection device further includes a determination unit that determines whether the defect exists based at least on data from the sensor obtained when the detection unit is at the second position.

[0020] The determination unit may determine that the defect does not exist when a detection value obtained by the sensor when the detection unit is at the second position is consistent with a reference value, and determine that the defect exists when the detection value deviates from the reference value.

[0021] Alternatively, the determination unit may also determine that the defect does not exist when the detection value is within a reference range, and determine that the defect exists when the detection value is outside the reference range.

[0022] The sensor may be a distance measuring sensor provided for measuring the distance between the arm and the support.

[0023] In this embodiment, the determination unit may determine that the defect does not exist when the measured distance when the detection unit is at the second position is consistent with the reference value, and determine that the defect exists when the measured distance deviates from the reference value.

[0024] Alternatively, the determination unit may also determine that there is no such defect when the measured distance is within the reference range, and determine that there is such a defect when the measured distance is outside the reference range.

[0025] Instead of the distance measuring sensor, an angle sensor provided for measuring the swing angle of the arm relative to the support may be used. Further, the determination unit may also use the measured angle as the detection value and the specified reference value / reference range to determine the presence or absence of the defect.

[0026] The defect detection device may further include a warning device that outputs a warning when the determination unit determines that there is a defect.

[0027] The first and second contact members may be arranged at intervals in the width direction of the main body material.

[0028] The first and second contact members may each be a rotating body.

[0029] The detection unit may further include a biasing member that biases the first and second contact members toward the main body material on the conveying plane when the detection unit is in the second position.

[0030] According to another embodiment of the present application, there is provided a bag making machine for successively manufacturing bags from a continuous planar main body material and accessory components.

[0031] The bag making machine includes:

[0032] A conveying device that intermittently conveys the main body material in its length direction;

[0033] A supply device that supplies the accessory components to the main body material; and

[0034] The above-mentioned defect detection device.

[0035] The defect detection device may be arranged to measure the offset of the accessory components relative to the main body material.

[0036] The supply device may supply a triangular sheet as the accessory component. The defect detection device may be arranged to detect a bending defect of the triangular sheet material.

[0037] The supply device may supply the folded side wall material as the triangular sheet material to the main body material each time the main body material is intermittently conveyed. Description of the Drawings

[0038] Figure 1AIt is a schematic top view of an exemplary bag-making machine, Figure 1B is Figure 1A front view.

[0039] Figure 2A It is a schematic front view of an exemplary defect detection device, Figure 2B is Figure 2A side view.

[0040] Figure 3A 、 Figure 3B It is a figure for explaining the operation of the moving mechanism.

[0041] Figure 4 It is a figure for explaining the defect detection method.

[0042] Figure 5 It is a figure illustrating defect detection.

[0043] Figure 6A 、 Figure 6B It is a figure illustrating defect detection.

[0044] Figure 7A 、 Figure 7B It is a figure illustrating defect detection.

[0045] Figure 8A 、 Figure 8B It is a figure illustrating defect detection.

[0046] Figure 9 It is a figure illustrating defect detection.

[0047] Figure 10 Illustrate defects.

[0048] Figure 11A 、 Figure 11B It is a figure illustrating defect detection.

[0049] Figure 12 It is a figure illustrating defect detection.

[0050] Figure 13 Indicates other exemplary arms.

[0051] Figure 14 It is a schematic top view of an exemplary lifting mechanism for the base.

[0052] Figure 15A 、 Figure 15B is Figure 14 front view of the lifting mechanism.

[0053] [Description of symbols]

[0054] 10, 11: Main body material (main component of the bag)

[0055] 12: Conveyor plane

[0056] 2: Side wall material (an example of an accessory component of the bag)

[0057] 30: Conveyor device

[0058] 33: Feeding device

[0059] 5: Defect detection device

[0060] 51: Biasing member

[0061] 53: Judgment unit

[0062] 54: Warning device

[0063] 6(6a~6e): Detection unit

[0064] 60: Support body

[0065] 61: Pivot

[0066] 62: Arm

[0067] 620, 621: Contact member

[0068] 63: Sensor

[0069] 7: Moving mechanism

[0070] 8: Lifting mechanism

[0071] Lr: Reference value Detailed implementation mode

[0072] Hereinafter, with reference to the drawings, the defect detection device and the bag-making machine of the embodiment will be described.

[0073] [Bag-making machine]

[0074] Figure 1A , Figure 1B Schematically shows an exemplary bag-making machine. The bag-making machine sequentially manufactures bags from the main materials 10, 11 and the accessory component 2 ( Figure 1A ). The main materials 10, 11 are the main components of the bag. The accessory component is the side wall material 2 in the embodiment. The main materials 10, 11 and the side wall material 2 are plastic films. Therefore, the bag is a plastic bag. These components 10, 11, 2 may also replace the plastic film and include, for example, a paper substrate and a film or resin material partially or wholly laminated on the substrate.

[0075] The bag-making machine includes a conveying device 30 that intermittently conveys at least two continuous planar main materials 10 and 11 in their longitudinal directions. Therefore, the main materials 10 and 11 are repeatedly conveyed and stopped. The symbol X1 represents the conveying direction of the main materials 10 and 11. The conveying device 30 includes a pair of conveying rollers 300 that are driven to intermittently convey the two main materials 10 and 11 in the direction X1 while sandwiching them.

[0076] In the embodiment, a wide-width web is continuously discharged from the blank 1, passes through the stacking device 31, is longitudinally cut in its longitudinal direction by a longitudinal cutting machine (not shown) to be divided into the main materials 10 and 11, and is vertically overlapped with each other through a guiding device (not shown). Then, the main materials 10 and 11 pass through the floating roller device 32. The floating roller device 32 appropriately converts the conveyance of the main materials 10 and 11 from continuous conveyance to intermittent conveyance.

[0077] The conveying device 30 further includes a plurality of guide rollers 301 and 302 provided downstream of the floating roller device 32. Through the guide roller 301, the upper main material 11 is separated from the lower main material 10, and through the guide roller 302, the main materials 10 and 11 are overlapped with each other again.

[0078] The bag-making machine further includes a supply device 33 that supplies the side wall material 2 to the main material 10 or 11 ( Figure 1A ). The supply device 33 in the embodiment is a well-known side wall material supply device that supplies the side wall material 2 to the lower main material 10 every time the main materials 10 and 11 are intermittently conveyed.

[0079] The side wall material 2 is pre-folded in half on both sides with respect to its longitudinal center line. The supply device 33 disposes the side wall material 2 on the upper surface of the main material 10 in the width direction of the main material 10 downstream of the guide roller 301 and upstream of the guide roller 302. Therefore, subsequently, when the main materials 10 and 11 are overlapped with each other through the conveying device 30 (the guide roller 302), the side wall material 2 is disposed between the main materials 10 and 11.

[0080] The bag-making machine further includes a temporary fixing device 34 ( Figure 1B), the temporary fixing device 34 temporarily fixes the side surrounding material 2 to the main body material 10 after the side surrounding material 2 is supplied to the main body material 10. The temporary fixing device 34 temporarily fixes the side surrounding material 2 to the main body material 10 by attaching the side surrounding material 2 to the main body material 10 in the form of ultrasonic sealing or heat sealing during each intermittent conveyance of the main body materials 10 and 11. Specifically, during the stop period of the main body materials 10 and 11, the supply device 33 arranges the side surrounding material 2 on the main body material 10, and thereafter, the temporary fixing device 34 temporarily fixes the side surrounding material 2 to the main body material 10. Such temporary fixing devices 34 are well known. The temporary fixing position is the center line of the side surrounding material 2 in the longitudinal direction.

[0081] The bag making machine further comprises a bending device 35, which bends the first end of the side gusset material 2 to form a triangular wing 20 ( Figure 1A ). The bending device 35 is arranged downstream of the temporary fixing device 34 and upstream of the position where the main body materials 10 and 11 overlap each other. The bending device 35 bends the two corners of the first end of the side gusset material 2 at an angle of 45 degrees each time the main body materials 10 and 11 are intermittently conveyed, thereby forming the triangular wing 20. Such a bending device 35 is well known.

[0082] The bag making machine further includes a temporary sealing device 36 for forming the opening surface 21 ( Figure 1A ), and the side wrapping material 2 is sealed to the main body material 10, 11. The temporary sealing device 36 seals the side wrapping material 2 to the main body material 10, 11 at least at the second end of the side wrapping material 2 (the end opposite to the triangular wing 20). The sealing can be in the form of a heat seal. Such temporary sealing devices 36 are well known.

[0083] The bag making machine also includes a first forming device 37, which forms an open surface 21 on the side surrounding material 2. The first forming device 37 can be a well-known guiding device including guiding components such as guide rollers, flat plates, and nip rollers. The first forming device 37 guides the upper main body material 11 as the main body materials 10 and 11 are conveyed, and bends the main body material 11 along the bending line 110. The bending line 110 extends along the length direction of the main body material 11. The side surrounding material 2 is sealed to both the main body materials 10 and 11 at its second end by a temporary sealing device 36, so when the main body material 11 is rolled up and bent by the first forming device 37, the upper layer of the side surrounding material 2 is also lifted together. Thus, an open surface 21 with a roughly rhombus shape is formed.

[0084] The bag making machine further includes a well-known open face sealing device 38 , which is disposed downstream of the first forming device 37 and seals the open face 21 to the panel materials 10 , 11 each time the panel materials 10 , 11 are intermittently conveyed.

[0085] The bag-making machine further includes a second forming device 39 that forms an auxiliary triangular piece 22 from the opening surface 21( Figure 1A ). The second forming device 39 is arranged downstream of the opening surface sealing device 38. The second forming device 39 can be a well-known guiding device including guiding members such as guiding rollers, flat plates, and feed rollers. The second forming device 39 guides the upper main material 11 as the main materials 10 and 11 are conveyed, and folds the main material 11 along the folding line 110. Through this folding, the opening surface 21 is folded in half along the folding line 110, thereby forming the auxiliary triangular piece 22 from the opening surface 21.

[0086] The bag-making machine further includes a well-known lateral sealing device 40 that is arranged downstream of the second forming device 39 and heat-seals the side surrounding material 2 to the main materials 10 and 11 in the width direction of the main materials 10 and 11 each time the main materials 10 and 11 are intermittently conveyed. Furthermore, the bag-making machine includes a well-known cross-cutting device 41 that is arranged downstream of the lateral sealing device 40 and cross-cuts the main materials 10 and 11 and the side surrounding material 2 in the width direction of the main materials 10 and 11 each time the main materials 10 and 11 are intermittently conveyed. A bag is manufactured each time cross-cutting is performed. In addition to this, the bag-making machine may also include a known longitudinal sealing device that performs a sealing process parallel to the conveying direction of the main materials 10 and 11, but detailed description thereof is omitted.

[0087] [Defect detection device]

[0088] As Figure 2A 、 Figure 2B illustrated, the bag-making machine further includes a defect detection device 5 for detecting defects in bag making.

[0089] The defect detection device 5 includes a detection unit 6 and a moving mechanism 7.

[0090] As Figure 2A shown, the detection unit 6 includes a support 60, a pivot 61, an arm 62, and a sensor 63. The arm 62 is supported by the support 60 via the pivot 61 so as to be able to swing around the pivot 61. The arm 62 includes a first contact member 620 and a second contact member 621 that are arranged at a predetermined angular interval from each other with the pivot 61 as the center. The sensor 63 is configured to detect the relative displacement of the arm 62 with respect to the support 60.

[0091] As Figure 2BAs shown, the support body 60 may include two side plates 600, an upper slide member 601, and a lower slide member 602. The two side plates 600 are interconnected by the upper slide member 601 and the lower slide member 602. The pivot 61 extends parallel to the conveyance plane 12 of the main body materials 10 and 11.

[0092] In addition, a base 50 may be provided. The upper surface of the base 50 is at the same height as the conveyance plane 12. Therefore, the base 50 receives the main body materials 10 or 11 intermittently conveyed by the conveying device 30.

[0093] The arm 62 can pivot around the pivot 61 Figure 2A in the counterclockwise direction (the direction in which the detection chip 631 approaches the sensor head 630). The arm 62 can be provided respectively for the two side plates 600. As Figure 2A shown, the arm 62 includes first, second, and third extended portions 622, 623, and 624 extending in three different diametrical directions from the pivot 61 to the pivot 61. Moreover, a first contact member 620 and a second contact member 621 are respectively provided at the front ends of the first extended portion 622 and the second extended portion 623 facing the conveyance plane 12. The contact members 620 and 621 in the embodiment are rotatable bodies provided in a rotatable manner, specifically, rollers provided in a rotatable manner.

[0094] The sensor 63 may be a distance measuring sensor that measures the distance between the support body 60 and the arm 62 at a specified location. The sensor 63 is, for example, an eddy current type displacement sensor, and includes: a sensor head 630 mounted on the support body 60 / arm 62, and a metallic detection chip 631 mounted on the arm 62 / support body 60 and facing the sensor head 630, and can measure the distance from the sensor head 630 to the detection chip 631. When multiple arms 62 are provided, the sensor 63 is provided for each of the arms 62.

[0095] In the embodiment, the sensor head 630 is mounted on the side plate 600, and the detection chip 631 is mounted at the front end portion of the third extended portion 624 on the side opposite to the contact members 620 and 621. Therefore, when the arm 62 swings relative to the support body 60, the distance between the sensor head 630 and the detection chip 631 changes, and the changed distance is measured by the sensor. In this way, the relative displacement of the arm 62 relative to the support body 60 can be detected. In addition to this, the distance measuring sensor may also be an optical type or the like.

[0096] As Figure 3A 、 Figure 3B shown, the moving mechanism 7 is configured to move the detection unit 6 to a first position where the first contact member 620 and the second contact member 621 are separated from the conveyance plane 12 ( Figure 3A)moves between the first contact member 620 and the second contact member 621 reaching the second position of the conveying plane 12. Figure 3B )Therefore, when the detection unit 6 is in the first position, the contact members 620 and 621 do not abut against the constituent elements of the bag such as the main body materials 10 and 11 and the side wall material 2 on the conveying plane 12. On the other hand, when the detection unit 6 is in the second position, the contact members 620 and 621 abut against any one of the constituent elements on the conveying plane 12, that is, the main body materials 10 and 11 or the side wall material 2.

[0097] The moving mechanism 7 may include, for example: a support guide 70 that supports and guides the detection unit 6 so as to be movable in the vertical direction; and an actuator 71 (such as a cylinder) that is mounted on the frame 42 of the bag making machine in order to move the support guide 70 and the detection unit 6 together in the vertical direction relative to the conveying plane 12. The defect detection device 5 may further include a biasing member 51 that is arranged to bias the first contact member 620 and the second contact member 621 toward the main body materials 10 and 11 on the conveying plane 12 when the detection unit 6 is in the second position.

[0098] As Figure 2B shown, the support guide 70 extends in the vertical direction, and the upper sliding member 601 and the lower sliding member 602 are arranged so as to be able to slide along the support guide 70. A stopper 72 is provided at the lower end of the support guide 70. The support body 60 (the lower sliding member 602) is locked by the stopper 72. When the detection unit 6 is in the second position and the contact members 620 and 621 abut against the main body materials 10 and 11 or the side wall material 2 or the base 50, the locking between the lower sliding member 602 and the stopper 72 is released, and a gap d1 is provided between the lower sliding member 602 and the stopper 72.

[0099] The biasing member 51 may be a coil spring, for example. The cylindrical support guide 70 is inserted through the biasing member 51. The biasing member 51 is provided across the adjusting nut 52 and the detection unit 6, thereby biasing the detection unit 6 downward. The adjusting nut 52 is externally fitted and screwed onto the threaded outer peripheral surface of the support guide 70. By operating the adjusting nut 52 to move along the support guide 70 and relative to the support guide 70, the acting force of the biasing member 51 can be adjusted.

[0100] According to the above structure, if the detection unit 6 moves from the first position to the second position by using the moving mechanism 7 and a gap d1 is created, the biasing member 51 is compressed by the gap d1 and a specified acting force is generated. As a result, the contact members 620 and 621 are biased toward the main body materials 10 and 11 on the conveying plane 12. Therefore, it is ensured that the contact members 620 and 621 are in close contact with the constituent elements 10, 11 or 2 of the bag.

[0101] When moving from Figure 2B the state where the moving mechanism 7 lifts the support guide 70 by a distance d1 by the actuator 71, the stopper 72 engages with the lower slider 602. Therefore, when the moving mechanism 7 further lifts the support guide 70, the detection unit 6 moves upward together with the support guide 70, and the contact members 620, 621 move away from the conveyance plane 12. Therefore, no force is applied to the constituent elements 10, 11, or 2.

[0102] During the conveyance of the main body materials 10, 11, the moving mechanism 7 positions the detection unit 6 at the first position. Moreover, during the stop of the main body materials 10, 11, the moving mechanism 7 moves the detection unit 6 from the first position to the second position and then moves it from the second position back to the first position.

[0103] As shown only Figure 2A in, the defect detection device 5 further includes a determination unit 53 and a warning device 54. The determination unit 53 is configured to determine whether there is a defect in the bag making, as described later, at least based on the data from the sensor 63 obtained when the detection unit 6 is at the second position. Hereinafter, with reference to Figure 4 , the operation of defect detection will be described.

[0104] As Figure 4 shown, during the stop of the main body materials 10, 11, the moving mechanism 7 positions the detection unit 6 at the second position from the first position, and makes the contact members 620, 621 abut against the main body materials 10, 11 or the side surrounding material 2. Figure 4 shows the state where the contact members 620, 621 abut against the constituent elements 10, 11 or 2 of the bag in the case of no defect (the illustration of the constituent elements is omitted). The symbols C1 and C2 respectively represent the contact points of the contact members 620, 621 with the constituent elements 10, 11 or 2. The symbol Hr represents the relative height between the contact members 620, 621 in the case of no defect. Figure 4 In the example of, Hr is not zero, but there are also cases where Hr is zero in the case of no defect.

[0105] The output from the sensor 63 in the case of no defect, that is, the distance Lr in the embodiment, is stored as a reference value in the detection unit 6 in a storage medium. In the case of no defect, the sensor 63 of the detection unit 6 at the second position measures the same distance as the reference value Lr.

[0106] In the case of a defect, this defect causes a change in the thickness at this position. Therefore, when either of the contact members 620 or 621 abuts against this defective part, the relative height between the contact members 620 and 621 is different from Hr, resulting in the displacement (swing) of the arm 62 relative to the support 60. Therefore, in the case of a defect, the sensor 63 of the detection unit 6 located at the second position measures a distance different from the reference value Lr. In addition, the reference value Lr may vary corresponding to the defect to be detected.

[0107] Therefore, the determination unit 53 can detect the presence or absence of a defect based on the reference value Lr determined in advance according to the defect to be detected and the detection value obtained by the sensor 63 when the detection unit 6 is in the second position (i.e., when the contact members 620 and 621 are in contact with the main body materials 10 and 11 or the side wall material 2).

[0108] Specifically, the determination unit 53 compares the distance measured when the detection unit 6 is in the second position with the reference value Lr. When the measured distance coincides with the reference value Lr, the determination unit 53 determines that there is no defect. On the other hand, when the measured distance deviates from the reference value Lr, the determination unit 53 determines that there is a defect.

[0109] Then, the moving mechanism 7 moves the detection unit 6 from the second position to the first position, separating the contact members 620 and 621 from the main body materials 10 and 11 or the side wall material 2. Therefore, the conveyance of the main body materials 10 and 11 is restarted by the conveyance device 30. Such a defect detection operation is repeated every intermittent conveyance.

[0110] The determination unit 53 can be implemented, for example, by a processor executing a program stored in a storage medium.

[0111] The warning device 54 is configured to output a warning when the determination unit 53 determines that there is a defect. The warning device 54 may include visual devices such as light emitting diodes (LEDs), lamps, displays, and / or auditory devices such as speakers. Therefore, the output of the warning can be performed by the emission of light and / or the generation of sound. The warning device 54 may also be configured to display the defective part on a display.

[0112] [Example of Defect Detection]

[0113] The following shows an example of the detection of defects in bag making. As Figure 1A shown, a plurality of detection units 6a to 6e are provided in the bag making machine. The moving mechanism 7, the biasing member 51, the adjusting nut 52 ( Figure 2A etc.) are provided separately for each of the detection units 6a to 6e.

[0114] The detection units 6a to 6d are placed upstream of the first forming device 37 so as to face the side wall material 2 during the stop of the main body materials 10 and 11. The defect detection device 5 uses the detection units 6a to 6d to simultaneously determine the presence or absence of defects in a plurality of parts. Figure 5 The setting of the contact points Ca1, Ca2, Cb1, Cb2, Cc1, Cc2, Cd1, and Cd2 of the contact members 620 and 621 of the respective detection units 6a to 6d is exemplified respectively.

[0115] The detection unit 6a is used to detect the presence or absence of a curled portion (an example of a bending defect) of the side wall material 2 as a defect. As Figure 6A shown, when there is no curled portion, the heights of the contact points Ca1 and Ca2 are the same as each other. On the other hand, as Figure 6B shown, when there is a curled portion, the heights of the contact points Ca1 and Ca2 are different from each other. Therefore, when there is a curled portion, the distance measured by the sensor 63 deviates from the reference value Lr. Accordingly, the determination unit 53 can determine whether a curled portion exists based on the data from the sensor 63.

[0116] As Figure 7A , Figure 7B shown, the presence or absence of a curled portion can be detected at two different parts. In this case, two detection units 6a are provided, or one detection unit 6a includes two arms 62. The contact points Ca1 and Ca2 are in pairs, and the contact points Ca1' and Ca2' are in pairs. As Figure 7A , Figure 7B clearly described, when there is a curled portion (defect) and when there is no curled portion (defect), the heights of the contact points Ca2 / Ca2' are different. Therefore, the determination unit 53 can detect the presence or absence of a curled portion at a plurality of parts. In addition, as described above, when a plurality of detection parts are provided, if a defect exists in any one of the detection parts, the warning device 54 can output a warning.

[0117] As Figure 8A , Figure 8B shown, it is also possible to detect the presence or absence of curled portions that can occur at both side corners of the side wall material 2. As Figure 8A described, when there is no curled portion, the heights of the contact points Ca1 and Ca2 are different from each other. On the other hand, as Figure 8B described, when there is a curled portion, the heights of the contact points Ca1 and Ca2 are the same as each other. The same applies to the contact points Ca1' and Ca2'.

[0118] The detection units 6b and 6c are respectively used to detect the presence or absence of the formation of the triangular flap 20 of the side wall material 2 (an example of a bending defect) as a defect. That is, as Figure 9As described above, when the triangular fin 20 is properly formed (no defect), the heights of the contact points Cb1 and Cb2 are different from each other. On the other hand, when the triangular fin 20 is not formed, the heights of the contact points Cb1 and Cb2 are consistent with each other (not shown). The same is true for the contact points Cc1 and Cc2. Therefore, the determination unit 53 can determine whether the triangular fin 20 is formed based on the data from the sensor 63.

[0119] Furthermore, one detection unit 6 including two arms 62 may be used to detect the presence or absence of the formation of two triangular fins 20 .

[0120] The detection unit 6d is used to detect the first side edge 13 (close to the main body material) of the side gusset material 2 relative to the main body material 10, 11. Figure 5 ) as a defect. Figure 10 Indicates the formation of an open surface 21 ( Figure 1A ) is configured such that the end edge 23 on one side of the side material 2 is offset toward the first side edge 13 relative to the allowable limit line 152 (see arrow S). Symbol 14 represents the second side edge of the main body material, and symbol 15 represents the temporary sealing device 36 ( Figure 1A The temporary sealing portion 15 comprises a rectangular sealing portion 150 and a triangular sealing portion 151 at one end thereof. Figure 10 For the sake of convenience, the figure is drawn with a larger scale than the actual scale. The allowable limit line 152 is an imaginary line that passes through the front end of the temporary sealing portion 15 (triangular sealing portion 151) and extends along the longitudinal direction of the main body materials 10 and 11.

[0121] like Figure 10 As shown, when the end edge 23 is offset relative to the allowable limit line 152 toward the first side edge 13, the main body materials 10 and 11 are sealed to each other through the front end portion of the triangular sealing portion 151, so the first forming device 37 cannot open the surface 21 ( Figure 1A ) processing.

[0122] like Figure 5 As shown, the contact points Cd1 and Cd2 of the detection unit 6d are set at positions close to the first side edge 13. Figure 5 As shown in FIG. 1 , when the side circumference material 2 is arranged such that the end edge 23 is close to the second side edge 14 or is located on the allowable limit line 152 (when there is no defect), the heights of the contact points Cd1 and Cd2 are consistent with each other. Figure 10As shown, when the side gusset material 2 is arranged such that the end edge 23 is closer to the first side edge 13 relative to the tolerance line 152 (when there is a defect), the heights of the contact points Cd1 and Cd2 are different from each other (because the height of the contact point Cd1 when there is a defect is higher than when there is no defect). Therefore, the determination unit 53 can determine the presence or absence of the offset of the side gusset material 2 relative to the main body materials 10 and 11 based on the data from the sensor 63.

[0123] As Figure 11A , Figure 11B shown, the detection unit 6a can be used instead of the detection unit 6d. One of the contact points Ca1 is set to be closer to the first side edge 13 relative to the tolerance line 152 ( Figure 5 ). The other contact point Ca2 is set on the tolerance line 152. As Figure 11A shown, when the side gusset material 2 is arranged such that the end edge 23 is closer to the second side edge 14 or on the tolerance line 152 relative to the tolerance line 152 (when there is no defect), the heights of the contact points Ca1 and Ca2 are the same as each other. On the other hand, as Figure 11B shown, when the side gusset material 2 is arranged such that the end edge 23 is closer to the first side edge 13 relative to the tolerance line 152 (when there is a defect), the heights of the contact points Ca1 and Ca2 are different from each other (therefore, the height of the contact point Ca2 when there is a defect is lower than when there is no defect).

[0124] Figure 1A The detection unit 6e of Figure 12 is provided downstream of the second forming device 39 and is used to determine the presence or absence of a defect in the formation of the auxiliary gusset piece 22 (an example of a bending defect). Figure 12 shows the setting of the contact points Ce1 and Ce2 of the detection unit 6e. As Figure 12 shown, if the auxiliary gusset piece 22 is properly formed (if there is no defect), the heights of the contact points Ce1 and Ce2 are the same as each other. On the other hand, if the auxiliary gusset piece 22 is not properly formed (if there is a defect), the heights of the contact points Ce1 and Ce2 are not the same as each other. Therefore, the determination unit 53 can determine the defect in the formation of the auxiliary gusset piece 22 based on the data from the sensor 63.

[0125] As described above, the defect detection device 5 can detect various defects in the bag making by using the detection unit 6. As shown in the embodiment, the moving mechanism 7 only brings the contact members 620 and 621 into contact with the bag components 10, 11, or 2 when the main body materials 10 and 11 are stopped, so it is difficult to scratch the components 10, 11, or 2.

[0126] Furthermore, since the contact members 620 and 621 do not always abut against the measurement surface, the measurement can be carried out without problems not only on a continuous measurement surface but also on a discontinuous measurement surface with a step difference. For example, inFigure 1B In the interval where the main materials 10 and 11 are separated from each other, the step difference caused by the edge (boundary) of the side surrounding material 2 disposed on the main material 10 can also be measured.

[0127] Since the contact members 620 and 621 are in contact with the components 10, 11 or 2 not during the conveyance of the main materials 10 and 11 but during the stop, the close contact between the contact members 620 and 621 and the components 10, 11 or 2 of the bag is ensured even if the acting force of the urging member 51 is weak. This contributes to the weight reduction or low cost of the detection unit 6.

[0128] The bag-making machine is only an example. The attached components may be, in addition to the side surrounding material, gusset materials such as the bottom surrounding and the top surrounding. The attached components may also be the top surface portion or the bottom surface portion that does not function as a gusset. The attached components may also be a zipper for opening and closing the bag. Therefore, in addition to or instead of the side surrounding material supply device, a supply device for supplying other attached components may be provided. Moreover, the bag-making machine may also provide multi-row bag-making.

[0129] The detection unit 6 can be oriented such that the contact members 620 and 621 are arranged at intervals in both the length direction and the width direction of the main materials 10 and 11. The degree of freedom in the orientation of the detection unit 6 is high, and it can be used for detecting various defects during bag-making.

[0130] As Figure 13 shown, the first contact member 620 and the second contact member 621 may each be a ball smaller than a roller and rotatably provided at the front ends of the first extended portion 622 and the second extended portion 623. If the above-mentioned balls are used, defect detection can be performed even in a narrow area. From the viewpoint of preventing scratches on the components 10, 11 or 2 of the bag, the first contact member 620 and the second contact member 621 are preferably rotators such as rollers or balls, but may also include the front ends of the first extended portion 622 and the second extended portion 623.

[0131] The contact points C1 and C2 can also be adjusted by adjusting Figure 2B the dimension d2.

[0132] The detection unit 6 can be configured such that the distance between the sensor head 630 and the detection chip 631 becomes larger when there is a defect. Thereby, the collision between these 630 and 631 is avoided.

[0133] For the moving mechanism 7, the support guide 70 can also be omitted, and the support body 60 can be directly connected to the actuator 71 and moved by the actuator 71. The arm 62 can also apply an acting force to the main materials 10 and 11 on the conveyance plane 12 and is provided so as to be vertically movable and swingable relative to the support body 60.

[0134] As the sensor 63, instead of a distance measuring sensor, an angle sensor provided for measuring the swing angle of the arm 62 relative to the support 60 may be used. The angle sensor is, for example, a rotary encoder. In this case, the reference value used for defect detection is not the distance but the angle.

[0135] The determination unit 53 determines the presence or absence of a defect based on the detection value (for example, the measured distance or angle, obtained when the detection unit 6 is in the second position) and the reference value. Considering the allowable error and the like, the determination unit 53 may determine the presence or absence of a defect based on the detection value and a predetermined reference range. The reference range is a certain range including the reference value. The determination unit 53 determines that there is no defect when the detection value is within the reference range, and determines that there is a defect when the detection value is outside the reference range.

[0136] The reference value can be calculated in advance by the user or the processor of the bag-making machine based on the defect to be detected, the thickness of the components 10, 11 or 2, and the structure of the detection unit 6, etc. Alternatively, the reference value can be actually measured and obtained in advance at the preparation stage before operation (bag-making process). At the preparation stage, the contact members 620, 621 come into contact with the components 10, 11 or 2 in the defect-free state at the part to be detected. Moreover, the detection value (for example, the measured distance or angle) obtained by the sensor 63 during the contact is stored as the reference value (normal value) in the storage medium of the defect detection device 5 or the bag-making machine. The defect detection device 5 uses the reference value obtained in the above manner or the reference range determined by this reference value during the operation of the bag-making machine to detect defects in the above manner.

[0137] The timing for bringing the contact members 620, 621 into contact with the components 10, 11 or 2 to detect defects can be determined in advance according to the type of bag to be manufactured. For example, in one embodiment, the actuator 71 or the support guide 70 is arranged on a structural member linked to the operation of the sealing process of the bag-making machine. In this embodiment, it is possible to bring the contact members 620, 621 into contact with the components 10, 11 or 2 to detect defects only when the bag-making machine is operating and the structural member moves. When the bag-making machine is not operating, the structural member is at the top dead center. As a result, the actuator 71 and the support guide 70 are overly separated from the conveying plane 12, and it is impossible to bring the contact members 620, 610 into contact with the components 10, 11 or 2. That is, in this embodiment, the reference value cannot be measured at the preparation stage before operation.

[0138] Therefore, a modified example of this embodiment provides an exemplary defect detection device 5 configured to raise the base 50 before operation (bag-making process) to bring the components 10, 11 or 2 into contact with the contact members 620, 621, thereby enabling the reference value to be measured in advance.

[0139] AsFigure 14 , Figure 15A , Figure 15B As shown in Figure 15B , the defect detection device 5 further includes a lifting mechanism 8 for lifting the base 50. The lifting mechanism 8 includes: a rotating shaft 80 located below the base 50 and extending in the width direction of the main materials 10 and 11, and is supported by a frame (not shown) so as to be rotatable around its axis; at least one lifting arm 81 mounted on the rotating shaft 80 so as to rotate integrally with the rotating shaft 80; and at least one operating lever 82 for operation, connected to the rotating shaft 80. In the illustrated example, two lifting arms 81 are provided at intervals in the axial direction of the rotating shaft 80, and one operating lever 82 is provided at one end of the rotating shaft 80.

[0140] Furthermore, as Figure 15A , Figure 15B shown, the lifting mechanism 8 includes: a columnar sliding member 83 extending downward from the lower surface of the base 50; and a plurality of guide rollers 84 arranged to sandwich the sliding member 83 in order to guide the sliding member 83 in the vertical direction. Each lifting arm 81 includes a lifting roller 85 at its front end. The lifting roller 85 abuts against the lower surface of the base 50 to support the base 50. Therefore, the lifting roller 85 preferably has a highly wear-resistant and smooth surface.

[0141] According to the above structure, by operating the operating lever 82, the lifting arm 81 rotates integrally with the rotating shaft 80 around the rotating shaft 80. Thus, the base 50 can be lifted while maintaining the upper surface thereof horizontal by means of the guide rollers 84 and the lifting rollers 85. Lifting mechanisms of other structures can also be used for lifting the base 50.

[0142] When the user operates the operating lever 82 of the lifting mechanism 8 to raise the base 50 as shown in Figure 15A , the components 10, 11 or 2 in a defect-free state placed on the base 50 can be brought into contact with the contact members 620 and 621 of the arm 62 as shown in Figure 15B . Thus, before the operation of the bag-making machine, the reference value (normal value) can also be measured by the sensor 63 ( Figure 15A shown as Figure 15B omitted from the illustration in Figure 14 , Figure 15A , Figure 15B ). Then, the user operates the lifting mechanism 8 to lower the base 50 to its original position. The amount of rise of the base 50 can be, for example, about several tens of mm, for example, about 12 mm, and is so small as to be negligible when viewed from the long track line of the main materials 10 and 11 in the bag-making machine and will not affect bag-making. Figure 14 , Figure 15A , Figure 15B ​

Claims

1. A defect detection device is provided in a bag-making machine that intermittently conveys a continuous planar main material in its length direction for detecting defects in bag-making. The defect detection device is characterized in that: The defect detection device includes a detection unit. The detection unit includes: A support body; An arm supported by the support body so as to be swingable around a pivot; and A sensor for detecting the relative displacement of the arm with respect to the support body. The arm includes a first contact member and a second contact member provided at a predetermined angular interval from each other with the pivot as the center. The defect detection device further includes a moving mechanism for moving the detection unit between a first position where the first and second contact members are separated from the conveyance plane of the main material and a second position where the first and second contact members reach the conveyance plane. The moving mechanism positions the detection unit at the first position during the conveyance of the main material and moves the detection unit to the second position and then moves from the second position during the stop of the main material. The defect detection device further includes a determination unit that determines the presence or absence of the defect based at least on data from the sensor obtained when the detection unit is at the second position.

2. The defect detection device according to claim 1, wherein The determination unit determines that the defect does not exist when the detection value obtained by the sensor when the detection unit is at the second position is consistent with a reference value, and determines that the defect exists when the detection value deviates from the reference value, or The determination unit determines that the defect does not exist when the detection value is within a reference range, and determines that the defect exists when the detection value is outside the reference range.

3. The defect detection device according to claim 2, wherein The sensor is a distance measuring sensor provided for measuring the distance between the arm and the support body. The determination unit determines that the defect does not exist when the measured distance when the detection unit is at the second position is consistent with the reference value, and determines that the defect exists when the measured distance deviates from the reference value, or The determination unit determines that the defect does not exist when the measured distance is within the reference range, and determines that the defect exists when the measured distance is outside the reference range.

4. The defect detection device according to claim 1, wherein The determination unit further includes a warning device that outputs a warning when it is determined that the defect exists.

5. The defect detection device according to claim 1, wherein The first and second contact members are provided at intervals in the width direction of the main material.

6. The defect detection device according to claim 1, wherein The first and second contact members are respectively rotating bodies.

7. The defect detection device according to claim 1, wherein The detection unit further includes a biasing member configured to bias the first and second contact members toward the main material on the conveying plane when the detection unit is in the second position.

8. A bag-making machine that sequentially manufactures bags from a continuous planar main material and accessory components, the bag-making machine comprising: a conveying device that intermittently conveys the main material in its longitudinal direction; a supply device that supplies the accessory components to the main material; and a defect detection device as described in claim 1.

9. The bag-making machine according to claim 8, wherein the defect detection device is arranged to detect an offset of the accessory components relative to the main material.

10. The bag-making machine according to claim 8, wherein the supply device supplies triangular piece material as the accessory components, and the defect detection device is arranged to detect defective bending of the triangular piece material.

11. The bag-making machine according to claim 10, wherein the supply device supplies the folded side material as the triangular piece material to the main material each time the main material is intermittently conveyed.

Images