JP2008308195A - Bag sealing method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag sealing method and apparatus, whereby the left and right parts of the mouth are bent by equal length along a bending line set in advance when the mouth of a bag filled with its contents is bent and sealed, and thus the leakage of the contents can be prevented to the greatest possible level. <P>SOLUTION: The bag sealing method includes at least the bag mouth positioning conveyance step 20, in which the upper edges of the left and right parts of the mouth 3b of a bag 3 the bottom 3a of which has been sealed is positioned and the bag is conveyed while the upper edges of the left and right parts of the mouth 3b are positioned, and the sealing step 7 in which the mouth 3b of the bag 3 conveyed in the bag mouth positioning conveyance step 20 is sealed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bag body in which a bottom portion is sealed in advance and a mouth portion for filling contents to be stored is opened, and the mouth portion is sealed by folding the mouth portion of the bag body. The present invention relates to a sealing method and apparatus.

    Conventionally, in a bag body in which a bottom portion is sealed in advance and a mouth portion for filling contents to be accommodated is opened, after filling the contents, the mouth portion of the bag body is folded and sealed. Sealing methods and devices are well known.

  In addition, the bag body referred to in the present application is a single-layer or multi-layer pleated or non-pleated paper bag whose bottom is previously sealed and the mouth is opened, the outer bag is a paper bag, and the inner bag is made of synthetic resin or the like. It refers to a single or multi-layer pleated or non-pleated paper bag, or a single or multi-layer pleated or non-pleated bag.

  FIG. 18 is a conceptual diagram of a conventional bag sealing device 1 for explaining the above-described bag sealing method.

  In the bag sealing device 1, a bag 3 is placed on a conveying means 2 such as a belt conveyor disposed on the bottom surface of the device at the right end of the drawing. In addition, the bag body 3 of this figure is a bag body in which the bottom surface 3a was previously sealed and the mouth portion 3b was opened.

  The bag body 3 placed on the conveying means 2 is filled with contents (arrow A) from the mouth portion 3b via the contents filling means 4 such as a hopper.

When the contents are filled, the bag 3 is transported by the transport means 2 by the belt-type gripping transport means 5 that grips and transports both sides of the mouth portion 3b as indicated by the arrow B.

In this way, when the bag body 3 gripped on both sides of the mouth portion 3b by the belt-type gripping and conveying means 5 is transported as indicated by the arrow C, the bag body 3 becomes the entrance conveyor of the well-known mouth automatic sealing means 7. 6 is conveyed into the sealing means 7 in a state where the mouth portion 3b is gripped, and is bent once or a plurality of times along a folding line D preset in the mouth portion 3b of the bag body 3. The bent portion is sealed with a perforation, an adhesive, an adhesive tape, or the like, and is thereby discharged from the sealing means 7 as a bag body 8 with the mouth 3b sealed as shown at the left end of the drawing.

Note that the conveying means 2 for the bag 3 or the belt-type gripping and conveying means 5 has been conventionally disclosed in Japanese Patent Publication No. 49-22183, and the automatic sealing means 5 for the bag body has been conventionally disclosed in JP-A-2002. No. -332013 and the like are all known techniques.
Japanese Patent Publication No.49-22183 JP 2002-332013 A

  By the way, in the conventional bag sealing device 1 described above, as shown in FIG. 19, the left and right height positions of the mouth portion 3b of the bag 3 after the contents are filled are shown in FIG. It may be conveyed by the belt-type gripping and conveying means 5 and then delivered to the entrance conveyor 6 of the bag mouth automatic sealing means 7.

  Thus, when the bag body 3 is handed over to the entrance conveyor 6 of the mouth automatic sealing means 7 shown in FIG. 18 with the left and right height positions of the mouth part 3b of the bag body 3 being different, this mouth automatic sealing means. 7, the mouth 3 b is folded and sealed along a preset fold line D shown in FIG. 19, so that the folded flap 9 of the sealed bag body 8 is sealed in an inclined state as shown in FIG. 20. There is a case.

  As described above, when the folded flap 9 of the sealed bag body 8 is sealed in an inclined state, the left end 3c may not be completely sealed in the bag body 8 of FIG. 20, and the contents leak from there. There was a risk of it.

  In view of the above-described circumstances, the present invention folds and seals the mouth of a bag body filled with contents by folding the left and right sides of the bag to a uniform length along a preset folding line. It is an object of the present invention to provide a bag sealing method and apparatus that prevent leakage of contents as much as possible.

In order to solve the above-described problems, in the sealing method of the bag body of this application, the bottom left and right upper edge positions of the bag body that has been sealed in advance are positioned, and the left and right upper edge positions of the mouth are positioned. It includes at least a mouth portion positioning and conveying step for conveying the bag body, and a sealing step for sealing the mouth portion of the bag body conveyed through the mouth portion positioning and conveying step of the bag body.

Further, in the bag sealing device of this application, the mouth left and right upper edge positions are positioned by the mouth positioning portion for positioning the mouth left and right upper edge positions of the bag body whose bottom portion is sealed in advance, and the mouth positioning portion. A mouth part positioning / conveying means comprising a mouth part conveying part for conveying the bag body in a state; and a sealing means for sealing the mouth part of the bag body conveyed through the mouth part positioning / conveying means of the bag body; At least.

  According to the bag sealing method and apparatus according to the present invention described above, the upper and lower left and right edge positions of the bag body are inclined in the pre-process of the bag mouth sealing process by the bag mouth positioning and conveying process. Since the upper and lower left and right edge positions of the bag body are positioned at predetermined predetermined positions that are equal to the left and right, and the bag body is sent to the sealing process while maintaining the positioning state of the bag body mouth portion. In the sealing process, the left and right sides of the mouth of the bag body can be folded and sealed to a uniform length along a preset fold line, so that leakage of contents is prevented as much as possible. A sealed bag can be provided.

    Hereinafter, an embodiment of a bag sealing method and apparatus according to the present invention will be described in detail.

FIG. 1 is a conceptual diagram of a sealing device 10 for carrying out the bag sealing method according to the present invention, and the same parts as those in FIG.

  The sealing device 10 shown in FIG. 1 is greatly different from the conventional sealing device 1 shown in FIG. 18 in that the sealing device 10 shown in FIG. 1 fills the entrance conveyor 6 of the mouth automatic sealing means 7 with contents. Before the delivered bag body 3 is delivered, the left and right upper edges of the mouth portion 3b of the bag body 3 are positioned at a predetermined position, and the bag body 3 with the left and right upper edges of the mouth portion 3b positioned at the predetermined position is opened in that state. It is the point which has the opening part positioning conveyance means 20 of the bag body conveyed to the entrance conveyor 6 of the partial automatic sealing means 7.

  Next, the mouth portion positioning and conveying means 20 of this bag will be described in detail.

  FIG. 2 is an enlarged view of the mouth positioning and conveying means 20 described above.

The mouth positioning and conveying means 20 is roughly divided into a mouth positioning part 30 for positioning the left and right upper edges of the mouth 3b of the bag 3 at a predetermined position, and the left and right upper edges of the mouth 3b are predetermined by the mouth positioning part 30. It is comprised from the opening part conveyance part 40 which conveys the bag body 3 in the state positioned by the position.

  Among these, the mouth positioning part 30 for positioning the left and right upper edges of the mouth part 3b at a predetermined position is provided with a pair of grips provided to be opposed to each other on the left and right sides with an interval slightly wider than the width of the bag body 3. The members 31 and 32 and a pair of left and right sensor means 33 and 34 for measuring the height of the upper left and right edges of the mouth portion 3b of the bag body 3 are configured.

  The pair of left and right grip members 31 and 32 described above are different in arrangement position and are the same in structure. Therefore, the structure of one grip means 32 is described, and the description of the structure of the other grip member 31 is omitted. To do.

  As shown in FIG. 2, the gripping means 32 is arranged at the lower end of the elevating arm 32b that is moved up and down by the linear head 32a, and at the lower end of the elevating arm 32b. The gripping arm 32d moves in the direction of the arrow 32c, and a rubber belt 32e is attached to the tip of the gripping arm 32d. 2 and 3, reference numeral 50 denotes a frame fixed to the sealing device 10.

  According to the pair of left and right gripping members 31 and 32 having the above-described structure, as shown in FIG. 4, the mouth 3b of the bag body 3 is inserted between the rubber belts 32e of the pair of gripping arms 32d, and this is detected. On the basis of the control signal of the control device (not shown), the air chuck 32c is operated, and the pair of gripping members 31, 32 are connected to the right end or the left end of the corresponding mouth portion 3b as shown in FIG. Grip between the rubber belts 32e.

  Next, when each gripping arm 32d of each gripping member 31, 32 grips the right end or left end of the mouth portion 3b between the rubber belts 32e, it is shown in FIG. 6 based on a control signal of a control device (not shown) that detects the completion. As described above, the linear head 32a is operated to raise and lower the elevating arm 32b and to elevate the left and right upper edges of the mouth portion 3b sequentially.

  On the other hand, the pair of left and right sensor means 33 and 34 shown in FIG. 2 is composed of a pair of photosensors 33a and 33b disposed at a predetermined distance in the vertical direction, and the photosensors 33a and 33b are light emitting diodes. It is comprised by the light emission and light receiving element comprised by these.

Next, the operation of the mouth positioning part 30 for positioning the left and right upper edges of the bag mouth part 3b described above at a predetermined position will be described.

  As shown in FIG. 7, when the bag body 3 filled with the contents is conveyed by the conveying means 2 and its mouth 3 b is fitted between the rubber belts 32 e of the gripping arms 32 d constituting the gripping members 31 and 32. (FIG. 4), each air chuck 32c is actuated based on a control signal of a control means (not shown) for detecting it, and the left and right ends of the corresponding mouth 3b of the bag 3 are gripped and fixed between the rubber belts 32e. (FIG. 5).

  At that time, as shown in FIG. 7, the upper end of the mouth portion is conveyed in an inclined posture, and therefore, the right end side upper edge 3b1 and the left end side upper edge 3b2 of the mouth portion 3b are the upper and lower sides constituting the sensor means 33, 34. When the pair of upper and lower photosensors 33a and 33b are not detected by the sensor means 33 and 34, respectively, the right end side upper edge 3b1 and the left end side upper edge 3b2 of the mouth portion 3b are not detected by the pair of photosensors 33a and 33b. As shown in FIG. 8, for example, first, the linear head 32a of the right gripping member 31 is actuated by a control signal of a control device (not shown) that controls the operation of the gripping members 31 and 32, thereby moving the lifting arm 32b. Raise like an arrow.

Thus, when the optical sensor 33a of the sensor means 33 detects the right end side upper edge 3b1, the control device stops the raising of the elevating arm 32b based on the detection signal, and the right end side upper edge 3b1 of the bag body 3 is moved to the optical sensor 33a. Stop positioning at the position.

Next, as shown in FIG. 9, the control device operates the linear head 32a of the left gripping member 32 in the same manner, thereby raising the lifting arm 32b.

Thus, when the optical sensor 33a above the sensor means 34 detects the left end side upper edge 3b2, the raising of the elevating arm 32b is stopped, and the left end side upper edge 3b2 of the bag 3 is positioned and stopped at the position of the optical sensor 33a. .

  Thus, when the right end side upper edge 3b1 and the left end side upper edge 3b2 of the mouth portion 3b are not detected by the pair of upper and lower optical sensors 33a, 33b of the sensor means 33, 34 at the initial position shown in FIG. As described above, the lifting arms 32b of the gripping members 31 and 32 are sequentially raised, and the right end side upper edge 3b1 and the left end side upper edge 3b2 of the bag body 3 are detected by the optical sensors 33a of the sensor means 33 and 34, respectively. At this point, when the lifting of the respective lifting arms 32b is stopped, the upper edge position 3b 'of the mouth 3b of the bag 3 connects the optical sensors 33a of the sensor means 33 and 34 as shown in FIG. The positioning is stopped at the same position as the line segment. Needless to say, the height at which the sensor means 33 and 34 are arranged is the same.

  In addition, in the initial position of FIG. 7, the right end side upper edge 3b1 and the left end side upper edge 3b2 of the mouth portion 3b are detected by both the pair of upper and lower optical sensors 33a, 33b of the corresponding sensor means 33, 34. In this case, the lifting and lowering arms 32b of the gripping members 31 and 32 are sequentially lowered on the basis of a control signal of a control device (not shown), whereby the bag 3 by the optical sensor 33a of the sensor means 33 and 34 is obtained. When the detection of the right end side upper edge 3b1 and the left end side upper edge 3b2 disappears, the lowering of the respective lifting arms 32b is stopped. Also in this case, as shown in FIG. 9, the upper edge position 3b 'of the mouth portion 3b of the bag body 3 is positioned and stopped at substantially the same position as the line segment connecting the optical sensors 33a of the sensor means 33 and 34. It becomes.

  Further, at the initial position shown in FIG. 7, one or both of the right end side upper edge 3b1 and the left end side upper edge 3b2 of the mouth portion 3b is a pair of upper and lower optical sensors 33a of the corresponding sensor means 33, 34. , 33b is detected only by the optical sensor 33b and not detected by the optical sensor 33a, the raising and lowering of the grip members 31, 32 on the side detected only by the optical sensor 33b based on the control signal of the control device The arm 32b is lifted, and when the right end side upper edge 3b1 or the left end side upper edge 3b2 of the bag body 3 is detected by the optical sensor 33a of the sensor means 33, 34, the lift of the lifting arm 32b is stopped. To. Also in this case, as shown in FIG. 9, the upper edge position 3b ′ of the mouth portion 3b of the bag body 3 is positioned and stopped at substantially the same position as the line segment connecting the optical sensors 33a of the sensor means 33 and 34. Become.

  Next, the mouth part conveyance part 40 of the mouth part positioning conveyance means 20 shown in FIG. 2 will be described.

  The mouth transport unit 40 includes a belt-type transport unit 41 including a pair of transport belts that grip the mouth 3 b of the bag body 3, a belt driving unit 42 that rotationally drives the belt-type transport unit 41, and the bag body 3. The belt opening / closing means 43 is configured to hold the opening 3b between the pair of conveying belts and to release the holding.

  Among them, the belt conveying means 41 is a pair of opposed ones formed of an elastic body such as rubber as shown in FIG. 10 shown in the EE conceptual enlarged sectional view of FIG. 2 and FIG. 11 shown in the FF conceptual sectional view of FIG. The pair of endless transport belts 45 and 46 are stretched between driving and driven pulleys 47 and 48, respectively.

  Of the driving and driven pulleys 47, 48, the driving pulley 47 is fixed to the driving shaft 47a, and the driven pulley 48 is rotatably supported on the driven shaft 48a.

  Further, as shown in FIG. 10, the drive shaft 47a and the driven shaft 48a described above are a pair of slide plates 50 and 51 disposed so as to face each other with a predetermined distance so as to sandwich the mouth portion of the bag. It is supported by. Further, belt positioning members 52 and 53 shown in FIG. 11 are fixed to the lower surfaces of the pair of slide plates 50 and 51.

  On the other hand, as shown in FIG. 10, the pair of slide plates 50 and 51 described above are provided with belt driving means 42 that rotationally drives the respective drive shafts 47 a of the corresponding conveyor belts 45 and 46.

  The belt drive means 42 is stretched between a drive motor 54 disposed for each drive shaft 47a of the corresponding transport belt 45, 46, and between the drive shaft 54a and the drive shaft 47a of the drive motor 54. And a drive belt 55.

  According to such a belt driving means 42, when the pair of drive motors 54 rotate in the opposite direction in synchronization with each other, as indicated by the arrows in FIG. Will rotate.

  On the other hand, as shown in FIG. 10, the belt separating means 43 includes a pair of support plates 60 and 61 for supporting the pair of slide plates 50 and 51, and a slidable member in which the support plates 60 and 61 are fixed to the lower surface. A pair of guide plates 62 and 63 and a pair of connecting / disconnecting means 70 for connecting and disconnecting the pair of guide plates 62 and 63 along the guide groove 64 as shown by arrows.

  The separating / connecting means 70 includes a link means 71 including a link arm having a pantograph structure disposed on a pair of guide plates 62 and 63, and an actuator 72 including a hydraulic cylinder or the like that drives the link means 71. ing.

    According to the belt separating / connecting means 43, when the drive shaft 72a of the actuator 72 is driven from the initial position of the actuator 72 shown in FIG. 10 and the link shaft 71a of the link means 71 moves upward, as shown in FIG. In addition, the pair of slide plates 50 and 51 approach each other as indicated by an arrow through the pair of guide plates 62 and 63, whereby the pair of transport belts 45 and 46 approach each other as shown in FIG. By the belt pressing force of the positioning members 52 and 53, the mouth portion of the bag body is held between them.

    In FIG. 12, reference numerals 73 and 72 are guide grooves for sliding the pair of base portions 71b of the link means 71, reference numerals 74 and 75 are guide grooves for sliding the pair of support plates 60 and 61, and reference numeral 78 is Reference numeral 79 denotes a mounting plate fixed to the apparatus 10 and a mounting plate having a substantially U-shaped cross section fixed to the lower surface of the mounting plate 78.

  Next, the overall operation of the sealing device 10 according to the present invention described above will be described.

  First, as shown in FIG. 1, at the right end of the drawing, the bag body 3 is placed on the conveying means 2 such as a belt conveyor disposed on the bottom surface of the apparatus 10. Thereafter, the contents (arrow A) are filled from the mouth portion 3b through the contents filling means 4 such as a hopper.

    In this way, when the contents are filled in the bag body 3, the bag body 3 is conveyed by the conveying means 2 to the belt-type gripping and conveying means 5 as indicated by the arrow B.

    The belt-type gripping / conveying means 5 is conveyed to the bag-portion positioning / conveying means 20 which is a main component of the present invention while both sides of the mouth 3b of the bag 3 are gripped. When the bag body 3 is transported into the mouth positioning transporting means 20 by the belt-type gripping transporting means 5, a control device (not shown) detects the detection based on a detection signal from a detection means (not shown). A control signal is sent to the means 5 to release the grip of the mouth 3b of the bag body 3.

    When the mouth 3b of the bag 3 is transported to the mouth positioning / conveying means 20 of the bag, as shown in FIG. 4, the mouth positioning part 30 of the mouth positioning / conveying means 20 is configured. The pair of gripping arms 32d are spaced apart from each other at a predetermined interval at the initial position, so that the mouth portion 3b of the bag body 3 is smoothly inserted between the pair of gripping arms 32d.

    Similarly, when the mouth portion 3b of the bag body 3 is transported to the mouth portion positioning and conveying means 20 of the bag body, as shown in FIG. The pair of belts 45, 46 are spaced apart from each other at a predetermined interval at the initial position, so that the mouth portion 3 b of the bag body 3 is smoothly inserted between the pair of belts 45, 46.

  In this way, the mouth 3b of the bag 3 is inserted between the pair of gripping arms 32d of the mouth positioning and conveying means 20 as shown in FIG. 4 and between the pair of belts 45 and 46 shown in FIG. Is detected by a detection means (not shown), first, as shown in FIG. 5, each air chuck 32c of the mouth portion positioning / conveying means 20 is actuated based on a control signal of a control device (not shown). The mouth portion 3b is held and fixed between the rubber belts 32e.

  Thereafter, the control device performs the positioning process in the height direction of the mouth portion 3b of the bag body 3 shown in FIGS. 7 to 9, and the upper edge position 3b of the mouth portion 3b of the bag body 3 as shown in FIG. Is positioned substantially at the same height as the line segment connecting the optical sensors 33a of the sensor means 33 and 34.

    That is, the right and left upper edge positions 3b1 and 3b2 of the mouth 3b of the bag 3 are not inclined as shown in FIG. The left and right upper edge positions 3b1 and 3b2 are positioned at predetermined positions that are equal in height to the left and right.

      During the positioning process of the left and right upper edge positions 3b1 and 3b2 of the bag body mouth part 3b by the mouth part positioning part 30 described above, the mouth part transporting part 40 shown in FIG. The state in which the mouth 3b of the bag 3 is fitted between the belts 45 and 46 is maintained.

    Next, when the detection device (not shown) detects that the positioning processing of the left and right upper edge positions 3b1 and 3b2 of the bag body mouth portion 3b by the mouth positioning portion 30 is completed, the control device (not shown) A control signal is sent to the mouth conveying unit 40 shown in FIG. 14, thereby driving the actuator 72 shown by the belt separating / connecting means 43 to move the link shaft 71a of the link means 71 upward as shown in FIG. Thus, the pair of slide plates 50 and 51 are brought close to each other as indicated by arrows, and the mouth portion 3b of the bag body 3 is gripped between the pair of transport belts 45 and 46.

    As shown in FIG. 15, it is detected by a detection device (not shown) that the mouth 3b of the bag 3 is gripped between the pair of transport belts 45 and 46 by the belt separating means 43 of the mouth transport 40. Then, as shown in FIG. 4, the control device (not shown) operates each air chuck 32 c of the mouth portion positioning portion 30 to release the grip of the mouth portion 3 b of the bag body 3.

Thus, when it is detected that the gripping of the mouth 3b of the bag body 3 by the mouth positioning part 30 is released, the control device (not shown) causes the belt driving means of the mouth transporting part 40 shown in FIG. A drive signal is sent to 42, whereby the pair of drive motors 54 rotate in opposite directions in synchronization with each other.

  Then, as indicated by the arrows in FIG. 16 shown in the FF cross section of FIG. 15, the pair of transport belts 45 and 46 rotate in opposite directions in synchronization with each other, and are thereby gripped between the pair of transport belts 45 and 46. The mouth portion 3b of the bag body 3 is sent to the entrance conveyor 6 of the well-known mouth automatic sealing means 7 while maintaining the positioned height.

    The mouth 3 b of the bag 3 sent to the entrance conveyor 6 is gripped between the pair of transport belts 6 a and 6 b of the entrance conveyor 6 and is transported into the mouth automatic sealing means 7.

  In the automatic mouth sealing means 7, as shown in FIG. 9, the left and right upper edge positions 3b1 and 3b2 of the bag body 3 are sent in a state where they are positioned at predetermined predetermined positions equal to the left and right. Therefore, as shown in FIG. 17, the bag body 8 sealed in the sealing step of the mouth automatic sealing means 7 has the left and right upper edge positions 3b1 and 3b2 of the mouth 8 along the folding line D set in advance. Therefore, the folded flap 9 of the bag body 8 is not sealed in an inclined state, and therefore, the contents of the sealed bag body 8 are not sealed in the mouth portion 3b. It is possible to prevent the possibility of leakage from the device as much as possible.

      In the above-described embodiment, as shown in FIG. 1, the bag body 3 filled with the contents is transported to the belt-type gripping and transporting means 5 and the bag body mouth positioning and transporting means 20 which is the main component of the present application. However, the present invention is not limited to the above-described embodiment, and the operator directly uses the bag body 3 filled with the contents without using the belt-type gripping and conveying means 5. You may make it convey to the part positioning conveyance means 20. FIG.

  As described above, in the present invention, when the mouth portion of the bag body filled with the contents is folded and sealed, the left and right sides of the mouth portion are folded and sealed along a predetermined folding line to a uniform length. Thus, the present invention is suitable for a bag sealing method and apparatus for preventing leakage of contents as much as possible.

FIG. 1 is a conceptual diagram showing the entire bag sealing device according to the present invention. FIG. 2 is a conceptual front view showing the mouth portion positioning and conveying means of the bag according to the present invention. FIG. 3 is a conceptual diagram showing the operation of the mouth portion positioning portion of the mouth portion positioning and conveying means of the bag according to the present invention. FIG. 4 is a conceptual diagram showing the action of the mouth positioning part of the mouth part positioning and conveying means of the bag according to the present invention. FIG. 5 is a conceptual diagram showing the operation of the mouth positioning part of the mouth part positioning / conveying means of the bag according to the present invention. FIG. 6 is a conceptual diagram showing the operation of the mouth positioning part of the mouth part positioning / conveying means of the bag according to the present invention. FIG. 7 is a conceptual front view for explaining the operation including the sensor means of the mouth portion positioning portion of the bag according to the present invention. FIG. 8: is a conceptual front view explaining the effect | action including the sensor means of the opening part positioning part of the bag body which concerns on this invention. FIG. 9 is a conceptual front view for explaining the operation including the sensor means of the mouth portion positioning portion of the bag according to the present invention. FIG. 10 is a conceptual cross-sectional view of the mouth portion conveying portion of the mouth portion positioning and conveying means of the bag according to the present invention. 11 is a cross-sectional view of the FF in FIG. FIG. 12 is a conceptual cross-sectional view showing the operation of the mouth portion conveying portion of the mouth portion positioning and conveying means of the bag according to the present invention. 13 is a cross-sectional view of the main part of FIG. FIG. 14 is a conceptual cross-sectional view illustrating the operation of the mouth conveyance unit. FIG. 15 is a conceptual cross-sectional view illustrating the operation of the mouth conveyance unit. 16 is a conceptual cross-sectional view of the FF in FIG. FIG. 17 is a front view showing the sealed bag body. FIG. 18 is a conceptual diagram showing an entire conventional bag sealing device. FIG. 19 is a front view of a bag sealed by a conventional bag sealing device. FIG. 20 is a front view of a bag sealed by a conventional bag sealing device.

Explanation of symbols

3b ... Mouth part 3 ... Bag body 3b1, 3b2 ... Mouth part right and left upper edge position 7 ... Automatic sealing device (sealing means)
10: A bag sealing device.
20 ... Portion positioning / conveying means 30 of the bag body ... Portion positioning portions 31, 32 ... Pair of gripping members 33, 34 ... Sensor means 32a ... Linear head 32b ... Lifting arm 32c ... Air chuck 32d ... Pair of gripping arms 32e ... Rubber belt Reference numeral 40: mouth part conveying part 41 ... belt type conveying means 42 ... belt driving means 45, 46 ... a pair of conveying belts 40 ... belt separating / connecting means 47 ... driving pulley 48 ... driven pulley 54 ... driving motor 71 ... link means 72 ... actuator

Claims (10)

Positioning and conveying step of positioning the bag body in the state where the bottom left and right upper edge positions of the bag body are sealed in advance and conveying the bag body in a state where the left and right upper edge positions of the mouth are positioned;
A bag sealing method, comprising: a sealing step of sealing the mouth of the bag conveyed through the mouth positioning and conveying step of the bag.
A mouth portion positioning portion for positioning the left and right upper edge positions of the mouth portion of the bag body that is sealed in advance, and a mouth portion transporting the bag body in a state where the left and right upper edge positions of the mouth portion are positioned by the mouth portion positioning portion. A mouth portion positioning and conveying means of a bag body comprising a portion;
A sealing device for a bag, comprising: sealing means for sealing the mouth of the bag conveyed through the mouth positioning and conveying means of the bag.
The mouth portion positioning portion is provided with a gap slightly wider than the width of the bag body, and is arranged to face each other on the left and right sides, and a pair of gripping members that grip and lift the corresponding mouth portion of the bag body, The bag sealing device according to claim 2, comprising a pair of left and right sensor means for measuring the height of the left and right upper edges of the bag body mouth portion raised and lowered by the pair of gripping members.
The gripping means is disposed at the lower end of the lifting arm that is lifted up and down by a linear head, and in a direction in which the mouth of the bag body is gripped by an air chuck and in a direction in which the grip is released. The bag sealing device according to claim 3, comprising a pair of movable gripping arms.
5. The bag sealing device according to claim 4, wherein a rubber belt acting as a slip stopper is attached to the tip of the grip arm.
The mouth transport unit is configured to bring a belt-type transport unit including a pair of transport belts that grip the mouth of the bag body, a belt driving unit that rotationally drives the belt-type transport unit, and the pair of transport belts close to each other. And a belt separating means for holding the mouth of the bag body between the pair of belts and separating the pair of transport belts from each other to release the grip. The bag sealing apparatus according to the description.
7. The bag sealing device according to claim 6, wherein the belt conveying means includes a pair of endless conveying belts that are stretched between a pair of driving and driven pulleys and that face each other.
8. The bag sealing device according to claim 7, wherein the belt driving means includes a pair of drive motors arranged for each of the corresponding conveying belts and rotationally driving the corresponding conveying belts.
9. The bag sealing device according to claim 8, wherein the pair of drive motors rotate in opposite directions in synchronization with each other, and rotate the corresponding conveyance belts in opposite directions in synchronization with each other.
The bag sealing device according to claim 6, wherein the belt separating / connecting means includes link means including a link arm having a pantograph structure and an actuator for driving the link means.

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