Bag discharge mechanism and packaging bag equipped with the same

Abstract

To provide a bag discharge mechanism and a packaging machine equipped with the same, which has an extremely simple and inexpensive structure and can prevent discharge error from causing a machine stop even if a filler (packaged article) accumulates in a bag gripping part of a claw part and becomes sticky, or the packaging bag is gripped by only one claw part, and is effective for various fillers (packaged articles) such as powder, granules, liquid, and sugar.SOLUTION: A bag discharge mechanism 20 of the present invention has a packaging bag pressing part 30 that presses a packaging bag H attached to a fixed side bag gripping part 29 provided at a tip part of a second arm 22 when a claw part 24 is in an open state, thereby peeling off the packaging bag H.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a bag discharging mechanism suitable for use when discharging packaging bags held by a grip pair outside a packaging machine, and to a packaging machine equipped with the same. [Background technology]

[0002] Conventionally, when a malfunction occurs in a packaging machine, such as when a packaging bag held by a grip pair is an empty bag, the packaging bag is peeled off from the claw portion of the grip pair by a bag discharge mechanism and discharged outside the machine (for example, JP 2021-155101 A).

[0003] For example, one such bag discharge mechanism is an air-blowout bag discharge mechanism 100 shown in Figure 18 or Figure 19. This air-blowout bag discharge mechanism 100 is configured so that when reciprocating part 102 is retracted in direction R (towards the base end) by air cylinder 101 as shown in Figure 18, upper part 102a of reciprocating part 102 retracts claw roller 103 in direction R (towards the base end), which causes claw parts 104, 105 to open as shown in Figure 19, and further air blowing part 106 blows air from the base end side to the tip end side, causing packaging bag H to be peeled off from claw parts 104, 105 and discharged outside the machine.

[0004] Another bag discharge mechanism is a bag-beating type bag discharge mechanism 110 shown in Figure 22 or Figure 23. This bag-beating type bag discharge mechanism 110 is configured so that when the reciprocating part 102 is retracted in the R direction (towards the base end) by the air cylinder 101 as shown in Figure 22, the upper part 102a of the reciprocating part 102 retracts the claw roller 103 in the R direction (towards the base end), which causes the claw parts 104, 105 to open as shown in Figure 23, and furthermore, the bag-beating rod 113 is caused by the air cylinder 112 of the bag-beating device 111 to beat the packaging bag H downward, and at the same time, the air blowing part 114 blows air from the base end side towards the tip end side as an auxiliary, so that the packaging bag H is peeled off from the claw parts 104, 105 and discharged outside the machine.

[0005] However, if the filling (packaged goods) accumulates in the bag gripping portions of the claw parts 104, 105 and becomes sticky, or if the packaging bag H is gripped by only one of the claw parts 104 due to a bias of the packaging bag H during feeding as shown in Figure 20, one-sided gripping will occur as shown in Figures 20, 21 or 24, and the packaging bag H will avoid the air ejection and the bag beating rod 113, resulting in incorrect discharge and causing the machine to stop. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2021-155101 A Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, the objective of the present invention is to provide a bag discharge mechanism and a packaging machine equipped with the same that has an extremely simple and inexpensive structure and can prevent discharge errors and machine stoppages, even if the fillings (packaged items) have accumulated in the bag gripping portion of the claws and become sticky, or if the packaging bag is held by only one of the claws, and is effective for a variety of fillings (packaged items) such as powders, granules, liquids, sugar, etc. [Means for solving the problem]

[0008] The above-mentioned object is achieved by a bag discharge mechanism provided on a grip having a first arm, a second arm arranged parallel to the first arm, a claw part rotation shaft provided at the tip of the first arm, a claw part rotatably attached to the claw part rotation shaft, and a claw opening / closing rotation shaft provided at the tip of the second arm and to which the claw part is rotatably attached, the bag discharge mechanism being configured so that the claw part can be opened and closed by moving the first arm and the second arm relatively, wherein when the claw part is in the open state, the bag discharge mechanism has a packaging bag pressing part that presses a packaging bag attached to a fixed bag gripping part provided at the tip of the second arm to peel off the packaging bag (Claim 1).

[0009] It is preferable that the bag discharge mechanism has a pressing part for peeling off the packaging bag that presses and peels off the packaging bag attached to the movable bag gripping part provided at the tip of the first arm when the claw part is in the open state (Claim 2). It is preferable that the pressing part for peeling off the packaging bag is composed of a peeling plate that presses the packaging bag from both sides of the movable bag gripping part (Claim 3).

[0010] Furthermore, what achieves the above object is a bag discharge mechanism provided on a grip having a first arm, a second arm arranged parallel to the first arm, a claw part rotation shaft provided at the tip of the first arm, a claw part rotatably attached to the claw part rotation shaft, and a claw opening / closing rotation shaft provided at the tip of the second arm and to which the claw part is rotatably attached, the bag discharge mechanism being configured so that the claw part can be opened and closed by moving the first arm and the second arm relatively, the bag discharge mechanism being characterized in that when the claw part is in an open state, it has a packaging bag peeling pressing portion that presses and peels off the packaging bag attached to the movable bag gripping portion provided at the tip of the first arm (Claim 4).

[0011] Furthermore, what achieves the above object is a bag discharge mechanism provided on a grip having a first arm having a first bag gripping portion at its tip and a second arm arranged parallel to the first arm and having a second bag gripping portion at its tip, wherein the first bag gripping portion and the second bag gripping portion are configured to be openable and closable by moving the first arm and the second arm relatively, characterized in that when the first bag gripping portion and the second bag gripping portion are in an open state, the bag discharge mechanism has a packaging bag peeling pressing portion that presses a packaging bag attached to the first bag gripping portion and / or the second bag gripping portion to peel off the packaging bag (Claim 5).

[0012] It is preferable that the pressing portion for peeling off the packaging bag is composed of a peeling plate that presses the packaging bag from both sides of the first bag gripping portion and / or the second bag gripping portion (Claim 6). It is preferable that the pressing portion for peeling off the packaging bag is provided so as to be capable of reciprocating motion (Claim 7).

[0013] Furthermore, what achieves the above object is a packaging machine characterized by being equipped with a bag discharge mechanism as described in any one of claims 1 to 7 (claim 8). Effect of the Invention

[0014] According to the bag discharge mechanism described in claim 1, even if the filling (packaged item) accumulates in the bag gripping portion of the claw portion and becomes sticky, or the packaging bag is held by only one of the claw portions, the extremely simple and inexpensive structure can prevent discharge errors and machine stoppages, thereby providing a bag discharge mechanism that is effective for various fillings (packaged items) such as powders, granules, liquids, and sugar. According to the bag discharge mechanism recited in claim 2, in addition to the effect of claim 1, it is possible to peel off the packaging bag adhering to the movable bag gripping portion of the first arm. According to the bag discharge mechanism recited in claim 3, the bag discharge mechanism that achieves the effect of claim 2 can be configured with a simpler and more reliable structure. According to the bag discharge mechanism described in claim 4, it is possible to peel off a packaging bag attached to the movable bag gripping portion of the first arm, and even if the filling (packaged item) has accumulated in the bag gripping portion of the claw portion and become sticky, or if the packaging bag is gripped by only one of the claws, it is possible to prevent discharge errors causing machine stoppage with an extremely simple and inexpensive structure, and a bag discharge mechanism that is effective for various fillings (packaged items) such as powders, granules, liquids, sugar, etc. is configured. According to the bag discharge mechanism described in claim 5, even if the filling (packaged item) accumulates in the bag gripping portion of the claw portion and becomes sticky, or the packaging bag is held by only one of the claw portions, the extremely simple and inexpensive structure can prevent discharge errors that cause the machine to stop, thereby providing a bag discharge mechanism that is effective for various fillings (packaged items) such as powders, granules, liquids, and sugar. According to the bag discharge mechanism recited in claim 6, the bag discharge mechanism achieving the effect of claim 5 can be configured with a simpler and more reliable structure. According to the bag discharge mechanism recited in claim 7, the bag discharge mechanism that achieves the effect of claim 5 also for the fixed bag gripping portion can be configured with a more reliable structure. According to the packaging machine described in claim 8, even if the filling (packaged item) accumulates in the bag gripping portion of the claw portion and becomes sticky, or the packaging bag is gripped by only one of the claw portions, the extremely simple and inexpensive structure can prevent discharge errors and machine stoppages, thereby providing a packaging machine that is effective for various fillings (packaged items) such as powders, granules, liquids, and sugar. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic plan view of an embodiment of a packaging machine equipped with a bag discharge mechanism of the present invention. FIG. [Diagram 2] FIG. 2 is a perspective view of a claw part for explaining one embodiment of a bag discharge mechanism of the present invention. [Diagram 3] 2A and 2B are explanatory diagrams for explaining the operation of the bag discharge mechanism in the packaging machine shown in FIG. 1, where (a) is a diagram immediately before peeling off the packaging bag, and (b) is a diagram after peeling off the packaging bag. [Figure 4] 2A and 2B are explanatory diagrams for explaining the operation of the bag discharge mechanism in the packaging machine shown in FIG. 1, where (a) is a diagram before the packaging bag is peeled off, and (b) is a diagram after the packaging bag has been peeled off. [Diagram 5] 1A and 1B are explanatory diagrams for explaining the operation of another bag discharge mechanism in the packaging machine shown in FIG. 1, where (a) is a diagram before peeling off the packaging bag, and (b) is a diagram after peeling off the packaging bag. [Figure 6] 13 is a plan view for explaining the claw opening and closing mechanism of a grip pair in which the outer arm is a movable arm, and shows the open state. FIG. [Figure 7] 11A and 11B are plan views for explaining the claw opening and closing mechanism of a grip in which the outer arm is a movable arm, (a) showing the beginning of opening, and (b) showing the open state. [Figure 8] 13 is a plan view for explaining the claw opening and closing mechanism of a grip pair in which the outer arm is a movable arm, and shows a closed state. FIG. [Figure 9] 13A and 13B are diagrams for explaining the claw opening and closing mechanism of a grip in which the outer arm is a movable arm, (a) being a left side view and (b) being a plan view. [Figure 10]11A and 11B are explanatory diagrams for explaining the operation of another embodiment of the bag discharge mechanism of the present invention, where (a) is a diagram before peeling off the packaging bag, and (b) is a diagram after peeling off the packaging bag. [Figure 11] 11A and 11B are explanatory views for explaining the operation of the bag discharging mechanism shown in FIG. 10, in which (a) is a view before the packaging bag is peeled off, and (b) is a view after the packaging bag has been peeled off. [Figure 12] 11A and 11B are explanatory diagrams for explaining the operation of another bag discharge mechanism (fixed arm side) in the bag discharge mechanism shown in FIG. 10, where (a) is a diagram before the packaging bag is peeled off, and (b) is a diagram after the packaging bag has been peeled off. [Figure 13] 11A and 11B are explanatory diagrams for explaining the operation of another bag discharge mechanism (fixed arm side) in the bag discharge mechanism shown in FIG. 10, where (a) is a diagram before the packaging bag is peeled off, and (b) is a diagram after the packaging bag has been peeled off. [Figure 14] 13 is a plan view for explaining the claw opening and closing mechanism of a grip pair in which the outer arm is a fixed arm, and shows the open state. FIG. [Figure 15] 13A and 13B are diagrams for explaining the claw opening and closing mechanism of a grip in which the outer arm is a fixed arm, (a) being a plan view and (b) being a right side view. [Figure 16] 13 is a plan view for explaining the claw opening and closing mechanism of a grip pair in which the outer arm is a fixed arm, and shows a closed state. FIG. [Figure 17] 11A and 11B are plan views for explaining the claw opening and closing mechanism of a grip in which the outer arm is a fixed arm, (a) showing the closed state and (b) showing the open state. [Figure 18] 11 is an explanatory diagram for explaining an example of a conventional bag discharge mechanism. FIG. [Figure 19] 19 is an explanatory diagram for explaining the operation of the conventional bag discharge mechanism shown in FIG. 18. [Figure 20] 19 is an explanatory diagram for explaining the operation of the conventional bag discharge mechanism shown in FIG. 18. [Figure 21] 19 is an explanatory diagram for explaining a problem with the conventional bag discharge mechanism shown in FIG. 18. [Figure 22]13A and 13B are explanatory diagrams for explaining another example of a conventional bag discharge mechanism. [Diagram 23] 23 is an explanatory diagram for explaining the operation of the conventional bag discharge mechanism shown in FIG. 22. [Figure 24] 23 is an explanatory diagram for explaining a problem with the conventional bag discharge mechanism shown in FIG. 22. [Diagram 25] FIG. 13 is a perspective view illustrating a conventional claw part. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] In the present invention, a bag discharge mechanism 20 is provided on a grip 28 having a first arm 21, a second arm 22 arranged in parallel with the first arm 21, a claw part rotating shaft 23 provided at the tip of the first arm 21, a claw part 24 rotatably attached to the claw part rotating shaft 23, and a claw opening / closing rotating shaft 25 provided at the tip of the second arm 22 and to which the claw part 24 is rotatably attached, and the first arm 21 and the second arm 22 are moved relative to each other so that the claw part 24 can be opened and closed. By having a packaging bag pressing section 30 that presses the packaging bag H attached to the fixed bag gripping section 29 provided at the tip of the second arm 22 to peel off the packaging bag H, even if the filling (packaged item) accumulates in the bag gripping section of the claw section and becomes sticky, or even if the packaging bag is gripped by only one of the claws, it is possible to prevent discharge errors and machine stoppages with an extremely simple and inexpensive structure, and a bag discharge mechanism that is effective for various fillings (packaged items) such as powders, granules, liquids, sugar, etc., and a packaging machine P equipped with the same have been realized. EXAMPLES

[0017] A packaging machine equipped with a bag discharge mechanism of the present invention will be described with reference to an embodiment shown in FIGS. The packaging machine P of this embodiment includes a first arm 21, a second arm 22 arranged in parallel with the first arm 21, a claw part rotating shaft 23 provided at the tip of the first arm 21, a claw part 24 rotatably attached to the claw part rotating shaft 23, a claw opening / closing rotating shaft 25 provided at the tip of the second arm 22 and having the claw part 24 rotatably attached thereto, an arm link 26 connecting a base end side of the first arm 21 and a base end side of the second arm 22, and a second arm 22 having one end attached to the first arm 21. The packaging machine is characterized in that the bag discharge mechanism 20 is provided on a grip 28 configured to have a biasing portion 27 attached at the other end to the arm 22, and a claw part 24 is openable and closable by moving the first arm 21 and the second arm 22 relatively, and the claw part 24 has a packaging bag pressing portion 30 that, when the claw part 24 is in the open state, presses a packaging bag H attached to a fixed bag gripping portion 29 provided at the tip of the second arm 22 to peel off the packaging bag H. Each component will be described in detail below.

[0018] As shown in FIG. 1, the packaging machine P is a packaging machine that moves a movable body 11 equipped with a grip pair g by intermittently stopping it at multiple stations, fills a packaging bag H supported in a vertical position by the grip pair g with a filling material (item to be packaged) and seals the bag opening.

[0019] In the packaging machine P, as shown in FIG. 1, a stand that rotatably supports a vertically extending intermittent rotation shaft 12 is provided on the machine base, and a movable body (disk-shaped rotating body) 11 attached to the upper part of the intermittent rotation shaft 12 has ten grip pairs g for gripping or releasing packaging bags H, which are provided so as to protrude radially at equal angular intervals from the intermittent rotation shaft 12 as a center.

[0020] The packaging machine P is configured such that at the bag feeding station 1, the packaging bags H are picked up by a bag feeding device, and the packaging bags H are supported in a vertical position in a hanging state by a pair of grips g which move intermittently in sequence to the bag feeding station 1. The packaging machine P is also configured such that at the empty bag discharge station 8 and the seal cooling / product discharge station 10, the bag discharge mechanism 20 functions to discharge the packaging bags H.

[0021] As shown in FIG. 1, the packaging machine P of this embodiment has, at each station, a bag feeding process (bag feeding station 1) for feeding packaging bags H to the packaging machine, a printing process (printing station 2) for printing expiration dates and the like, a print inspection process (print inspection station 3) for inspecting the print, a bag opening process (bag opening station 4) for opening the mouth and the inside of the bottom of the packaging bag H, a filling process (filling station 5) for filling the packaging bag H with a filling material (packaged material), a process (bottom vibration station 6) for vibrating the bottom of the packaging bag H to level the packaged material, and a filling process (bottom vibration station 7) for filling the bag near the mouth of the bag. This equipment mass-produces products through a total of 10 processes: a blowing process (blowing station 7) in which the filled material (packaged material) is blown away; an empty bag discharge process (empty bag discharge station 8) in which empty bags are discharged; a top sealing process (top sealing station 9) in which the bag mouth is sealed horizontally to remove the air from the packaging bag H; and a seal cooling and product discharge process (seal cooling and product discharge station 10) in which the top seal is cooled and the packaging bag H containing the filled material (packaged material) is discharged outside the machine and defective packaging bags H are discharged outside the system.

[0022] Although this embodiment is a rotary type packaging machine P, the present invention can also be applied to known linear motion type packaging machines and track type packaging machines. The packaging bags H include, for example, gusset bags with fold-in portions on both side edges, self-supporting bags with fold-in portions at the bottom, zippered bags or flat bags equipped with zippers on these bags, etc. The fillings (packaged items) filled into the packaging bags H include, for example, pet food, fertilizer, rice, sugar, etc.

[0023] Specifically, in the bag feeding process (first process), the bag feeding device arranged in the bag feeding station 1 positions the packaging bags H, which are stacked on the bag feeding conveyor and transported sequentially, on the bag positioning table, then positions them in a vertical position and delivers them to the grips g, which move intermittently in sequence and wait. Specifically, the device is configured so that the bags are attracted one by one by a suction cup that is movable up and down by a servo motor, and are lifted to a predetermined height by a rotating arm and delivered sequentially to the grip pair g. At this time, the left and right claw parts 24 of the grip pair g are in an open state as shown in Fig. 6, and after they are able to grip both sides near the top of the packaging bag H, the left and right claw parts 24 are in a closed state as shown in Fig. 8, thereby gripping the packaging bag H and holding it in a vertical position.

[0024] In the printing process (second process) of the expiration date, etc., a printing process is performed in which the expiration date, etc. is printed on the packaging bag H. Specifically, the expiration date, etc. is printed on the packaging bag H by the printing and stamping means in the printing station 2.

[0025] In the print inspection process (third process), an inspection is performed to check whether the printing of the expiration date and the like printed in the printing process (second process) is performed properly. Specifically, this process is performed by a camera arranged in the print inspection station 3.

[0026] In the bag opening step (fourth step), the mouth of the packaging bag H is opened in the bag opening station 4 by being sucked outward from both sides by suction cups.

[0027] In filling the product to be packaged (fifth step), a set amount of the filler (product to be packaged) is filled into the packaging bag H from the discharge outlet of a funnel for filling the product to be packaged that is inserted from the bag opening at the filling station 5.

[0028] In the bottom vibration step (sixth step), the bottom of the packaging bag H is vibrated up and down by a bottom receiving body of a bottom receiving device in a bottom vibration station 6, so that the contents (packaged items) in the packaging bag H are leveled.

[0029] In the air blowing step (seventh step), an air blowing device at an air blowing station 7 blows away the filling material (packaged material) adhering to the vicinity of the mouth of the packaging bag H, thereby preventing sealing failure.

[0030] In the empty bag discharge step (eighth step), the bag discharge mechanism 20 is operated in the empty bag discharge station 8 to discharge empty bags and the like (for example, empty bags and bags with one grip) out of the system.

[0031] In the top sealing process (ninth process), the vicinity of the mouth of the packaging bag H is sealed horizontally from the front and back by a sealing device (seal bar) at the top sealing station 9. Prior to sealing, air is removed from the inside of the packaging bag H by an air vent.

[0032] In the seal cooling / product discharge process (ninth process), the vicinity of the mouth of the packaging bag H is cooled from both sides by a pair of cooling bars 37 in the seal cooling / product discharge station 10. In addition, the grip pair g opens, the grip of the packaging bag H is released (released), and good products and defective products are sorted through a sorting chute, with the defective products (e.g. bags with poor sealing) being discharged outside the system and the good products being discharged outside the machine by the product discharge conveyor.

[0033] As described above, the packaging machine P of this embodiment is configured to perform the above-mentioned respective packaging steps at each of the packaging stations 1 to 10 on the packaging bags H that are moved in sequence, thereby sequentially mass-producing products.

[0034] As shown in Figure 6 or Figure 8, the grip pair g in this embodiment consists of a pair of left and right grips 28 equipped with a bag discharge mechanism 20, and the pair of grips 28 for gripping or opening both sides near the upper part of the packaging bag H are symmetrically arranged opposite each other so that they can grip the packaging bag H arranged on the inside.

[0035] Specifically, the first arm 21 of the grip 28 is arranged on the outside in relation to the parallel second arm 22, with the side on which the packaging bag H is located being the inside, and in this embodiment is configured as a movable arm that moves back and forth between the base end side and the tip end side.

[0036] On the other hand, the second arm 22 is arranged on the inner side relative to the first arm 21, with the side on which the packaging bag H is located being the inner side, and in this embodiment is configured as a fixed arm that does not move back and forth between the base end side and the tip end side.

[0037] As shown in Figs. 6 to 9, a claw part rotation shaft 23 is provided on the tip side of the first arm 21, and a claw part 24 is provided rotatably around this claw part rotation shaft 23 as an axis.

[0038] The claw opening / closing pivot shaft 25 is provided at the tip of the second arm 22, allowing the claw part 24 to rotate, and also serves as a fulcrum at the tip of the second arm 22 fixed to the movable first arm 21, as shown in Figure 6 or Figure 8, allowing the claw part 24a of the claw part 24 to be opened and closed.

[0039] Specifically, the claw portion 24a of the claw part 24 is configured to be openable and closable between itself and a fixed bag gripping portion 29 provided on the tip side of the second arm 22, and configured to be able to grip or open the packaging bag H. More specifically, as shown in Fig. 7, the first arm 21 is configured to move relatively to the base end side (in the direction of the arrow) with respect to the second arm 22, so that the claw portion 24a of the claw part 24 is configured to be in an open state (a state in which the packaging bag H can be opened).

[0040] 7, the first arm 21 moves toward the base end side relative to the second arm 22 because the opening / closing roller 31 of the first arm 21 is pressed toward the base end side of the first arm 21. As a result, the first arm 21 moves toward the base end side, and the relative position between the first arm 21 and the second arm 22 changes, so that the claw portion 24a of the claw part 24 is configured to be in the open state.

[0041] The biasing portion 27 is for releasing the open state of the claw portion 24a of the claw part 24 to a closed state, and the biasing portion 27 in this embodiment is configured as a spring member (compression spring) having one end attached to the first arm 21 and the other end attached to the second arm 22, as shown in Fig. 8 or 9. When the pressure against the opening / closing roller 31 of the first arm 21 toward the base end side of the first arm 21 is released, the first arm 21 moves toward the tip side due to the elastic force (repulsive force) of the biasing portion 27 (spring member), releasing the open state of the claw portion 24a of the claw part 24 to a closed state as shown in Fig. 8.

[0042] In this embodiment, the biasing portion 27 is composed of a spring member, but is not limited to this and may be any member that can move the first arm 21 from the base end to the tip end, and may be composed of, for example, an air cylinder, a cam mechanism, a magnet, or a magnetic body.

[0043] The arm link 26 is for connecting the base end side of the first arm 21 and the base end side of the second arm 22 together.

[0044] The function and effect of the bag discharge mechanism 20 of this embodiment will be described. The bag discharge mechanism 20 of this embodiment operates such that, while the claw part 24 is in the open state, the state shown in Fig. 3(a) or Fig. 4(a) (a state immediately before the packaging bag pressing part 30 of the claw part 24 presses the packaging bag H attached to the fixed bag gripping part 29 provided at the tip of the second arm 22) passes through the state shown in Fig. 3(b) or Fig. 4(b) (a state in which the packaging bag pressing part 30 of the claw part 24 presses the packaging bag H attached to the fixed bag gripping part 29 provided at the tip of the second arm 22), and the packaging bag H attached to the fixed bag gripping part 29 is peeled off by the packaging bag pressing part 30 of the claw part 24 and discharged outside the system. This allows the packaging bag H attached to the fixed bag gripping part 29 provided at the tip of the second arm 22 to be peeled off.

[0045] The claw part 24 of this embodiment (see FIG. 2) differs from the conventional claw part 104 (consisting of a claw portion 104a and a pivot mounting portion 104b) shown in FIG. 25 in the shape of the pivot mounting portion 24b. That is, the pivot mounting portion 24b of the claw part 24 of this embodiment is formed larger than the pivot mounting portion 104b of the claw part 104 and is formed in a shape that extends inward. As a result, when the claw part 24 is in the open state, the packaging bag pressing portions (peel plates) 30 act to press and peel the packaging bag H from both sides of the fixed side bag gripping portion 29.

[0046] 5(a) (a state immediately before the packaging bag H attached to the movable bag gripping portion 32 provided at the tip of the first arm 21 is pressed by the packaging bag peeling pressure portion 33) through the state of FIG. 5(b) (a state in which the packaging bag H attached to the movable bag gripping portion 32 provided at the tip of the first arm 21 is pressed by the packaging bag peeling pressure portion 33) while the claw parts 24 are in the open state, so that the packaging bag H attached to the movable bag gripping portion 32 is peeled off by the packaging bag peeling pressure portion 33 and discharged outside the system. This allows the packaging bag H attached to the movable bag gripping portion 32 of the first arm 21 to be peeled off as well.

[0047] In this embodiment, the pressing section 33 for peeling off the packaging bag is composed of peeling plates (similar to the plate material of the pressing section 30 for the packaging bag shown in FIG. 4) that press the packaging bag H from both sides of the movable bag gripping section 32 provided at the tip of the first arm 21. This allows the pressing section for peeling off the packaging bag to be configured with a simpler and more reliable structure. EXAMPLES

[0048] Next, another embodiment of the bag discharge mechanism of the present invention will be described with reference to FIGS. The basic difference between the bag discharge mechanism 50 of this embodiment and the bag discharge mechanism 20 previously described is the shape of the grip.

[0049] The bag discharge mechanism 50 of this embodiment includes a first arm 52 having a first bag gripping portion 51 at its tip, a second arm 54 arranged in parallel with the first arm 52 and having a second bag gripping portion 53 at its tip, links 55, 61 connecting the first arm 52 and the second arm 54, and a biasing portion 56 having one end attached to the first arm 52 and the other end attached to the second arm 54, and is provided on a grip 57 configured so that the first bag gripping portion 51 and the second bag gripping portion 53 can be opened and closed by moving the first arm 52 and the second arm 54 relatively, and includes packaging bag peeling pressing portions 58, 59 that press the packaging bag H attached to the first bag gripping portion 51 and / or the second bag gripping portion 53 when the first bag gripping portion 51 and the second bag gripping portion 53 are in the open state to peel off the packaging bag H. Each component will be described in detail below.

[0050] As shown in Figure 14 or Figure 16, the grip pair t in this embodiment consists of a pair of left and right grips 57 equipped with a bag discharge mechanism, and is configured so that the pair of grips 57, for gripping or opening both sides near the upper part of the packaging bag H, are symmetrically arranged opposite each other so as to be able to grip the packaging bag H arranged on the inside.

[0051] Specifically, the first arm 52 of the grip 57 is arranged on the inner side in relation to the parallel second arm 54, with the side on which the packaging bag H is located being considered the inner side, and in this embodiment is configured as a movable arm that moves back and forth between the base end side and the tip end side.

[0052] On the other hand, the second arm 54 is arranged on the outside with respect to the first arm 52, with the side on which the packaging bag H is located being the inside, and in this embodiment is configured as a fixed arm that does not move back and forth between the base end side and the tip end side.

[0053] A first bag gripping portion 51 is provided at the tip of the first arm 52, and a second bag gripping portion 53 is provided at the tip of the second arm 54. As shown in FIG. 16, a packaging bag H is gripped between the first bag gripping portion 51 of the first arm 52 and the second bag gripping portion 53 of the second arm 54, and this state is configured to be a closed state (a state in which the packaging bag H can be gripped).

[0054] On the other hand, as shown in Fig. 14, the open state (state in which the packaging bag H can be opened) is established when the first bag gripping portion 51 of the first arm 52 and the second bag gripping portion 53 of the second arm 54 are spaced apart. Specifically, as shown in Fig. 17(b), the open state (state in which the packaging bag H can be opened) is established by the first arm 52 moving toward the base end side relative to the second arm 54.

[0055] 15(b), the first arm 52 moves toward the base end side relative to the second arm 54 because the opening / closing roller 60 of the first arm 52 is pressed toward the base end side of the first arm 52. As a result, the first arm 52 moves toward the base end side, and the relative positions of the first arm 52 and the second arm 54 change, so that the first bag gripping portion 51 of the first arm 52 and the second bag gripping portion 53 of the second arm 54 are separated from each other to enter an open state.

[0056] The biasing portion 56 is for releasing the open state of the first bag gripping portion 51 of the first arm 52 and the second bag gripping portion 53 of the second arm 54 to a closed state, and in this embodiment, the biasing portion 56 is composed of a spring member (compression spring) having one end attached to the first arm 52 and the other end attached to the second arm 54. When the pressure against the opening / closing roller 60 of the first arm 52 toward the base end side of the first arm 52 is released, the elastic force (repulsive force) of the biasing portion 56 (spring member) moves the first arm 52 toward the tip side, and as shown in FIG. 16, the first bag gripping portion 51 of the first arm 52 and the second bag gripping portion 53 of the second arm 54 are separated from each other to be in the open state.

[0057] In this embodiment, the biasing portion 56 is composed of a spring member, but is not limited to this and may be any member that can move the first arm 52 from the base end to the tip end, and may be composed of, for example, an air cylinder, a cam mechanism, a magnet, or a magnetic body.

[0058] Link 55 is for connecting the tip side of the first arm 52 to the tip side of the second arm 54, and link 61 is for connecting the base end side of the first arm 52 to the base end side of the second arm 54.

[0059] Next, the function and effect of the bag discharge mechanism 50 of this embodiment will be described. In the bag discharge mechanism 50 of this embodiment, when the first bag gripping portion 51 of the first arm (movable arm) 52 and the second bag gripping portion 53 of the second arm (fixed arm) 54 are separated from each other to enter an open state, the bag discharge mechanism 50 changes from the state shown in Fig. 10(a) (a state before the pressure portion 58 for peeling the packaging bag H attached to the first bag gripping portion 51 provided at the tip of the first arm 52 is pressed) to the state shown in Fig. 10(b) (a state in which the pressure portion 58 for peeling the packaging bag H attached to the first bag gripping portion 51 provided at the tip of the first arm 52 is pressed by the pressure portion 58 for peeling the packaging bag H attached to the first bag gripping portion 51 provided at the tip of the first arm 52), so that the packaging bag H attached to the first bag gripping portion 51 is peeled off by the pressure portion 58 for peeling and discharged outside the system. This is configured to peel off the packaging bag H attached to the first bag gripping portion 51 of the first arm 52.

[0060] 11, the packaging bag peeling pressing section 58 in this embodiment is configured with peeling plates that press the packaging bag H from both sides of the first bag gripping section 51 provided at the tip of the first arm 52. This allows the packaging bag peeling pressing section 58 to be configured with a simpler and more reliable structure.

[0061] 12, the bag discharge mechanism 50 of this embodiment is configured such that, in the middle of the second bag gripping portion 53 of the second arm (fixed arm) 54 and the first bag gripping portion 51 of the first arm (movable arm) 52 moving away from each other to enter the open state, the state of FIG. 12(a) (a state before the pressure portion 59 for peeling the packaging bag presses the packaging bag H attached to the second bag gripping portion 53 provided at the tip of the second arm 54) passes through the state of FIG. 12(b) (a state in which the pressure portion 59 for peeling the packaging bag presses the packaging bag H attached to the second bag gripping portion 53 provided at the tip of the second arm 54). The packaging bag H attached to the second bag gripping portion 53 is peeled off by the pressure portion 59 for peeling the packaging bag and discharged outside the system. This allows the packaging bag H attached to the second bag gripping portion 53 of the second arm 54 to be peeled off.

[0062] 13, the packaging bag peeling pressing section 59 in this embodiment is configured with peeling plates that press the packaging bag H from both sides of the second bag gripping section 53 provided at the tip of the second arm 54. This allows the packaging bag peeling pressing section 59 to be configured with a simpler and more reliable structure. Also, since the second arm 54 is a fixed arm, the packaging bag peeling pressing section 59 is configured to be able to peel off the packaging bag H attached to the second bag gripping section 53 by reciprocating due to a reciprocating mechanism such as a cylinder.

[0063] As described above, in the present invention, a bag discharge mechanism of an extremely simple and inexpensive structure is provided on or near each grip pair, thereby preventing discharge errors and machine stoppages even if the filling (packaged item) accumulates in the bag gripping portion of the claw portion and becomes sticky, or if the packaging bag is held by only one of the claws, and a bag discharge mechanism and a packaging machine equipped with the same are realized that can be effectively used for a variety of fillings (packaged items), such as powders, granules, liquids, and sugar.

[0064] It should be noted that the grips 28, 57 given in the embodiments of the bag discharge mechanism of the present invention are both composed of a fixed arm and a movable arm, but grips in which the juxtaposed arms are both composed of movable arms, as well as bag discharge mechanisms in which a pressure section for peeling off a packaging bag is juxtaposed in the vicinity thereof, are also included in the category of the bag discharge mechanism of the present invention. [Explanation of symbols]

[0065] P packaging machine H packaging bag g,t grip pair s Filling (packaged material) 1 Bag Feeding Station 2 Printing Station 3 Print Inspection Station 4 Bag opening station 5. Filling Station 6 Bottom Vibration Station 7. Blow-off Station 8 Empty bag discharge station 9 Top Seal Station 10. Sealing / cooling / product discharge station 11 Mobile 12 Intermittent Rotation Shaft 13 Bag feeding device 20 Bag discharge mechanism 21 First Arm 22 Second Arm 23 Claw part rotating shaft 24 Claw parts 25 Pivot shaft for opening and closing the jaws 26 Arm Link 27 Pressurizing section 28 Grip 29 Fixed side bag grip part 30 Packaging bag pressing section 31 Opening and closing rollers 32 Movable bag gripping part 33 Packaging bag peeling pressing part 50 Bag discharge mechanism 51 1st bag gripping part 52 First Arm 53 2nd bag gripping part 54 Second Arm 55 Links 56 Pressurizing part 57 Grip 58, 59 Pressing part for peeling off packaging bag 60 Opening and closing rollers 61 Links

Claims

1. a claw part pivot shaft provided at the tip of the first arm, a claw part rotatably attached to the claw part pivot shaft, and a claw opening / closing pivot shaft provided at the tip of the second arm to which the claw part is rotatably attached, the claw part being configured to be opened and closed by moving the first arm and the second arm relatively, the bag discharge mechanism being provided on a grip, the claw part having a packaging bag pressing portion that presses a packaging bag attached to a fixed bag gripping portion provided at the tip of the second arm when the claw part is in an open state, thereby peeling off the packaging bag.

2. The bag discharge mechanism according to claim 1, further comprising a pressing portion for pressing and peeling off the packaging bag attached to the movable bag gripping portion provided at the tip of the first arm when the claw part is in the open state.

3. 3. The bag discharging mechanism according to claim 2, wherein the packaging bag peeling pressing portion is constituted by peeling plates that press the packaging bag from both sides of the movable bag gripping portion.

4. a claw part pivot shaft provided at the tip of the first arm, a claw part rotatably attached to the claw part pivot shaft, and a claw opening / closing pivot shaft provided at the tip of the second arm and to which the claw part is rotatably attached, the claw part being configured to be opened and closed by moving the first arm and the second arm relatively, the bag discharge mechanism being provided on a grip, the claw part being configured to be opened and closed by moving the first arm and the second arm relatively, the bag discharge mechanism having a packaging bag peeling pressing portion that presses and peels off the packaging bag attached to a movable bag gripping portion provided at the tip of the first arm when the claw part is in an open state.

5. A bag discharge mechanism provided on a grip having a first arm having a first bag gripping portion at its tip and a second arm arranged parallel to the first arm and having a second bag gripping portion at its tip, wherein the first bag gripping portion and the second bag gripping portion can be opened and closed by moving the first arm and the second arm relative to each other, characterized in that when the first bag gripping portion and the second bag gripping portion are in an open state, the bag discharge mechanism has a packaging bag peeling pressing portion that presses a packaging bag attached to the first bag gripping portion and / or the second bag gripping portion to peel off the packaging bag.

6. The bag discharge mechanism according to claim 5 , wherein the packaging bag peeling pressing portion is constituted by a peeling plate that presses the packaging bag from both sides of the first bag gripping portion and / or the second bag gripping portion.

7. The bag discharging mechanism according to claim 6, wherein the pressure section for peeling the packaging bag is provided so as to be capable of reciprocating motion.

8. A packaging machine comprising the bag discharge mechanism according to any one of claims 1 to 7.

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