JPH069884B2 - Packaging bag folding device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag mouth-folding device in which one corner of a tubular packaging bag opening is bent inward to form a mouth.

2. Description of the Related Art A valve piece supply mechanism that sends out a single valve piece, a valve piece adhesion mechanism that receives and rotates the valve piece and adheres it to the mouth of the bag, and bends the lower fold of the packaging bag to the left and right. Expand the mouth of the bag,
After the valve piece has been attached, the opening with the valve is opened, which consists of two holding plates that fold the valved part inward and make a Bates fold, a fold-folding plate, and a folding plate that rotates from the front lower side. A valve bag mouth opening folding device having a folding mechanism is known from Japanese Patent Application Laid-Open No. 56-62144.

In addition, it consists of a positioning part and a valve creation part that has a tapping rod provided between the opening and closing plates, and a fixed rod that can be brought into and out of contact with the top and bottom of the opening and closing plate is installed and forward and backward opening and closing before the operation of the tapping rod on the side of the opening and closing plate The mouth-folding device in the bag-making machine equipped with the expanding complement mechanism having the expanding bar is
It has been proposed as an issue.

However, these products do not bond the folded part and the front and back paper when the Bates fold is performed by folding one corner of the opening, so that the folded part easily projects to the outside of the bag, and the contents are put in the bag after manufacturing. When filled, the contents easily leak from the folded portion.

Further, as in JP-A-58-134168, for example, a sheet of paper is automatically folded into a tubular shape, and an adhesive is applied to the lap portion to bond them together, and an adhesive is applied to the bottom lid portion. A bag-making device for envelopes that are folded back is known, but such a bag-making device is usually a flat paper adhesive before folding a roller or the like to which an adhesive has been attached during transportation in the bag-making process. It has a gluing device for contacting the applied portion, and it is impossible to perform the staking operation on the inner surface of the bag folded in a tubular shape like the Bates folding portion with such a gluing device.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and automatically folds the mouth portion of a bag by Bates folding, and automatically performs gluing at the same time when Bates folding is performed. By applying a glue to both inside parts and then folding it with Bates, the folded part of the folded packaging bag holds its position securely and prevents the contents from leaking from the folded part. It is intended to provide a device.

Means and Actions for Solving Problems In order to solve the above problems, the mouth folding device for a packaging bag according to the present invention expands the mouth portion of the bag by expanding the side of the fold on one side of the packaging bag to the left and right. An expanding device for opening, and a folding plate for rotating the opening part of the mouth swing toward the inside of the bag from outside of the one side opening part of the bag, and bending the opening part inward to perform Bates folding. It has a mouth opening and folding mechanism that consists of a foldable glue that abuts both inside parts of the mouthpiece of the bag and attaches the glue before the bag mouth is opened and then folded inside. A gluing mechanism with a rod is provided, the folds below the packaging bag are bent to the left and right to open the mouth of the bag, and then the gluing rod of the gluing mechanism is advanced to both inside parts of the paper of the bag. The glue is applied, and then the glue rod is retracted, and then the mouth is bent inward to perform Bates folding.

Embodiments Hereinafter, the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the packaging bag mouth folding device comprises a mouth folding portion gluing mechanism 1 and a mouth portion widening opening folding mechanism 2.

As shown in FIG. 2, the gluing mechanism 1 for the folding portion is configured such that one drive shaft 3 is rotatably inserted, and the arm 6 rotates around the cam plate 4 fixed to the machine frame as the arm 6 rotates. It is provided with a glue rod 5 which freely reciprocally rotates. The gluing rod 5 is provided on an upper portion of a rotary shaft 8 which will be described later, and glues the folded portions of the pair of packaging bags. Assembling of each part of the gluing mechanism 1 for the folding part is as follows. An arm 6 is fixed to a mounting frame that is mounted on the drive shaft 3 with a key, and a bearing cylinder 7 is fixed to one end of the arm 6, and a rotating shaft 8 having a glue rod 5 fixed to one end thereof is attached to the bearing cylinder 7.
And a bevel gear 9 is fixed to the other end of the rotating shaft 8. A bevel gear 10 that meshes with the bevel gear 9 is fixed to one end of the arm 6 and the swing arm 1 is attached to the other end.
A shaft 12 having one end fixed thereto penetrates laterally. A cam follower 13 is pivotally attached to the other end of the swing arm 11. The cam follower 13 is always in contact with the cam plate 4 fixed to the machine frame and moves with the rotation of the arm 6. That is, the cam follower 13 intermittently reciprocates the swing arm 11 by the rotation of the arm 6, and the shaft 12 and the bevel gear 10 alternate in the counterclockwise direction and the clockwise direction in conjunction with the reciprocating motion of the swing arm 11. Then, the rotating shaft 8 which is integrated with the bevel gear 9 which is interlocked with the bevel gear 10 is intermittently reciprocally rotated in the same manner to intermittently reciprocally rotate the glue rod 5. In the figure, 14 is a spring for pressing the cam follower 13 onto the cam surface of the cam plate 4.

The mouth widening folding mechanism 2 includes a spreading device including two holding plates 21 and two fold-folding plates 22, a folding plate 23, and a driving mechanism for these.

(See Figures 1, 3 and 4). As shown in FIG. 4, the two holding plates 21 are pivotally supported 24 and 25 respectively on the bases of the machine frame, and are provided so as to open and close slightly to the left and right when viewed from FIG. The bases 21a, 21a of the holding plate 21 are bent inward at right angles, and the top plate 27 of the upper and lower rods 26 shown in FIG.
Are engaged. That is, when the top plate 27 is above, the left and right holding plates 21 are opened left and right by a leaf spring (not shown), and when the top plate 27 is moved downward, both holding plates 21 are closed as shown in FIG. It will be in a state of joint palm. The upper and lower rods 26 that move the top plate 27 up and down are fixed by the cam 28 fixed to the drive shaft 50.
Only the downward movement is forcibly moved via the cam follower rod 29 axially supported in the middle. Base 2 of the left and right presser plates 21
Each of 1a and 21a is fixed to a center barrel 30 and an outer barrel 31 shown in FIG. 5 so that they can be rotated separately.
Both shafts are concentric cylinders centering on the upper and lower rods 26, and are integrally provided with bevel gears 32 and 33 at their bases. The bevel gears 32 and 33 are simultaneously meshed with a bevel gear 35 which is reciprocally rotated by a groove cam 34 shown in FIG. The grooved cam 34 is fixed to the drive shaft 50, the grooved cam 34 is fixed to the drive shaft 50, and a part of the fan gear 36 pivotally mounted on the machine frame is engaged with the grooved cam 34. A spur gear 37 coaxial with the bevel gear 35 meshes with the sector gear 36 (FIG. 3). That is, the groove cam 34
Rotation of the fan gear 36 causes the bevel gear 35 to reciprocally rotate, thereby rotating the inner cylinder 30 and the outer cylinder 31.
Rotate in the opposite direction, and the two presser plates 21 operate in two modes, one in the palm-holding state and the other in the state in which the left and right sides are rotated 90 ° to the left and right sides, and the two fold-folding plates 22 are as shown in FIGS. At the bottom of each holding plate 21, one side of the triangle is in a vertical state and the bottom is fixed to the base of the holding plate 21. Therefore, the fold-folding plate 22 is also operated in two modes, like the holding plate 21 in a palm-like state and in a state of being rotated by 90 ° and opened. However, the surface of the holding plate 21 is different from that of the fold-folding plate 22. It is located on the side of the gluing mechanism with a slight gap.
As shown in FIGS. 1 and 6, the folding plate 23 is located in front of the pressing plate 21 and the fold-folding plate 22, and when both the plates 21 and 22 are opened, the folding plate 23 goes from the lower side to the upper side. Move in a vertical plane. The folding plate 23 is fixed to the tip of the attachment piece 40, and the base of the attachment piece 40 is pivotally attached 41 to the machine frame, and the upper end of the thrust rod 43 is pivotally attached to the vicinity thereof by another shaft 42. The vertical movement of the push-up rod 43 is guided by the machine frame, and the lower portion thereof engages with the cam 44 fixed to the drive shaft 50. A tension spring 45 is stretched between the mounting piece 40 and the machine frame (FIG. 1). That is, by the rotation of the cam 44,
The push-up rod 43 moves upward to rotate the attachment piece 40 upward about the pivot point 41 and move the front edge of the folding plate 23 to the vicinity of the center of the pressing plate 21 and the pleated bending plate 22. . The lowering of the thrust rod 43 is caused by the spring 45 attached to the mounting piece 40.
Due to the tension of.

The device of the present invention is supplied with a packaging bag 51 stuck in a tubular shape as shown in FIG. This packaging bag 51 is
The two-sided paper 52 has already been folded inward to form folds 55 formed by superposition of the side-paper 52 and the front-side paper 53, and the side-paper 52 and the back-side paper 54 on both sides (V-shaped in the figure). ). By forming the folds 55, the fold groove 56 and the groove bottom line 5 are formed.
7 are formed. In addition, 58 is an opening, 59 is a bottom, 6
Reference numeral 0 is a mouthpiece formed in a part of the opening. FIG. 8 shows a state in which both sides of the mouth paper 60 of the opening 58 are glued, folded inwardly and adhered to the front surface paper 53 and the back surface paper 54, and the mouth folding is completed. The operation of the device of the present invention will be described with reference to FIG.

(A) At the beginning of the operation, both the pressing plate 21 and the fold-folding plate 22 are in the palm-joint state, and the upper and lower rods 26 have the cam 28.
Because it moves freely upwards in relation to
A plate spring (not shown) is used to expand the upper part of the plate. In this situation, first, the tubular packaging bag 51 (hereinafter referred to as the packaging bag) is arranged so that the opening 58 is in the front and the mouthpiece 60 is in the downward direction.
It is dropped and supplied from above. Then, the groove bottom line 57 of the packaging bag 51 (hereinafter, the packaging bag is omitted) is in contact with the abutting apexes of the pleat folding plates 22, and the lower pleat 55 on both sides is the pressing plate 21 on both sides and the pleat folding plate, respectively. Located in the gap of 22.

(B) Since the upper and lower rods 26 are moved down by the cam 28, the pressing plate 2
1 stands up and securely holds the packaging bag 51 from both sides.

(C) While the upper and lower rods 26 are moving downward, the bevel gear 35 is rotated within a predetermined range by the groove cam 34, so that the holding plate 21 and the pleated and bent plate 22 are rotated 90 ° to the left and right respectively. At this time, the folds 55 on both sides are formed by the fold-folding plate 2
The opening 58 expands because it is located between 2 and the holding plate 21 and can be bent 90 ° to the left and right by the fold-folding plate. That is, the side paper 52 is stretched and the folds 55 disappear in front of the fold-folding plate 22 which is rotated by 90 ° and opened, and the fold 55 becomes one flat surface, and the opening widens accordingly. In reality, the paper has a bulge, so that the opening expansion is larger as shown in FIG.

(D) By the operation of the gluing mechanism 1 at the folding portion, the gluing rod 5 is rotated, and gluing is applied to both inner portions of the spread paper 60.

In the pasting mechanism 1, the glue 70 is supplied to the tip of the pasting rod 5 before the state shown in FIG. 2, that is, in the state where the pasting rod 5 is rotated in the direction opposite to the mouth widening folding mechanism 2. It Then, as the drive shaft 3 rotates, the cam plate 4 fixed to the machine frame is pressed against the cam plate 4 by the biasing force of the spring 14, and the cam follower 13 moves to swing the swing arm 11. Shaft 1 for swinging swing arm 11.
2 is interlocked to rotate the bevel gear 10, and the bevel gear 1 is rotated.
Bevel gear 9 engaging with 0 interlocks with rotation of arm 6 to rotate rotation shaft 8 and expands glue stick 5 fixed to the tip of rotation shaft 8 And the glue 70 is attached to this portion. After the attachment, the sticking rod 5 is rotated in the direction opposite to the opening widening folding mechanism by the rotation of the drive shaft 3, and the glue dropping device, the glue absorber or the glue spraying is provided on the side opposite to the opening widening folding mechanism 2. The glue 70 is supplied to the tip of the rod 5 by a glue applying device such as a device.

(E) When the glue rod 5 is removed from the front of the mouth widening folding mechanism 2, the cam 44 immediately pushes the pushing rod 43 upward, so that the folding plate 23 is pushed downward from the holding plate 21 and the pleat folding plate. Move quickly toward the center of 22 and fold the lower corner of the opening inward at right angles along groove line 57. Both inner portions of the mouth paper 60 are adhered to the insides of the lower corners of the front surface paper 53 and the back surface paper 54 with the glue 70.

(F) After the folding plate 23 quickly returns to its original position, the holding plate 21 and the fold-folding plate 22 that have been opened 90 ° to the left and right until now are closed again by the action of the groove cam 34, and the folding part is formed. Bates folding is completed by making the creases and the adhesion of the mouth paper more complete. After this, the upper and lower rods 26, which were also moved down until now, are released from the regulation of the cam 28,
As shown in FIG. 9 (a), the holding plate 21 in the palmed-up state is slightly expanded at the upper side, and the packaging bag with the folded mouth is taken out upward, and the next tubular packaging bag is fed.

EFFECTS OF THE INVENTION Since the present invention has the above configuration and operation, when forming a mouth-folded portion by Bates folding at one corner of the opening of a tubular bag,
It is possible to automatically and efficiently perform the folding work and the gluing work to the adhesive part between the folded portion and the front and back surface paper inside, and moreover, both inside parts of the mouthpiece of the manufactured packaging bag are the front surface paper. And since it is glued to the inner surface of the back side paper, the state where the mouth is securely folded inside the packaging bag does not return to the state before folding and the leakage of contents from the folding part is prevented can do.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an entire main part of an embodiment of the present invention, FIG. 2 is a partial plan sectional view of the same as above, FIG. 3 is a partial side view of the same as above, and FIG. Is a partial front view of the above, FIG. 5 is a side view showing a part of the same in cross section, FIG. 6 is a side view of a part of the same, FIG. 7 is a perspective view of a packaging bag, FIG. 8 is a perspective view of another state of the same as above, and FIGS. 9A to 9F are views of a packaging bag showing the order of operation. DESCRIPTION OF SYMBOLS 1 ... Adhesive mechanism, 2 ... mouth opening expansion folding mechanism, 3 ... drive shaft,
4 ... Cam plate, 5 ... Glued rod, 6 ... Arm, 8,12 ... Rotating shaft, 9,10 ... Bevel gear, 11 ... Swing arm, 13 ... Cam follower, 14 ... Spring, 21 ... Pressing plate, 22 ... pleat-folding plate, 23 ... folding plate, 26 ... upper and lower rods, 30 ... middle shaft cylinder, 31 ... outer shaft cylinder, 43 ... groove cam, 43 ... thrust rod,
51 ... tubular packaging bag, 55 ... pleats, 57 ... groove bottom line.

Claims (2)

[Claims] Claim: What is claimed is: 1. A device for expanding a fold of one side of a packaging bag to the left and right to expand the mouth of the bag, and an outside of the bag near the one mouth when the mouth is expanded. In the folding apparatus for a packaging bag, which is provided with a folding-opening folding mechanism including a folding plate that is rotated from one side toward the inside of the bag and bends the opening portion toward the inside to perform Bates folding, A sizing mechanism having an advancing / retracting sizing rod for adhering the sizing by contacting both inner side portions of the mouthpiece of the bag before being expanded after being expanded Bag folding device. 2. The gluing mechanism rotates intermittently in the thickness direction of the gluing rod inside the bag by transmitting intermittent reciprocating rotation of an oscillating arm that rotates around a drive shaft and oscillates in accordance with a cam. The packaging bag mouth-folding device according to claim 1, which is a product.