JPS61120729A - Mouth folding device for packaging bag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a packaging bag folding device that folds a corner of the opening of a tube-shaped packaging bag inward to form a mouth.

Prior Art A valve piece supply mechanism that sends out a single valve piece, a valve piece adhesion mechanism that rotates after receiving the valve piece and adheres it to the opening of a bag, and a valve piece adhesion mechanism that rotates to receive the valve piece and adhere it to the mouth of the bag, and a valve piece that bends the lower folds of the packaging bag from side to side. Expand the mouth of the bag,
After the valve piece is attached, the mouth opening is made up of two presser plates, a pleat folding plate, and a folding plate that rotates from the lower front side to fold the valve opening part inward to form a baler fold. A flap folding device for a packaging bag equipped with a folding mechanism is known as Japanese Patent Application Laid-Open No. 56-62144.

However, with this device, the mechanism for supplying and pasting the valve assembly is complicated, the number of parts is large, the cost is high, and the contents leak from the folded portion.

Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and eliminates the need for supplying the valve assembly by applying glue to both inner parts of the opening of the bag to the cane. It is an object of the present invention to provide a packaging bag opening device that securely holds the folded portion of a folded packaging bag in its position by performing baler folding and prevents contents from leaking from the folded portion.

Means and Function for Solving the Problems In order to solve the above problems, the present invention folds the lower pleats of the packaging bag to the left and right to widen the opening of the bag, and then bends the opening inward. In a packaging bag opening folding device equipped with a mouth opening and folding mechanism consisting of two presser plates and a pleat folding plate that perform baler folding, and a folding plate that rotates from below,
A gluing mechanism is provided that has a gluing rod that can move forward and backward to apply glue by contacting both inner sides of the bag opening after the opening of the bag is expanded and before it is folded inward. It is characterized by folding the lower pleats of the packaging bag to the left and right to expand the opening of the bag, and then advancing the gluing rod of the gluing mechanism to apply glue to both inner parts of the opening of one bag. Then, after retracting the glue stick, the mouth part is bent inward to perform Bates folding.

EXAMPLES Hereinafter, the present invention will be explained in detail based on the drawings. As shown in FIG. 1, the packaging bag edge folding device includes a gluing mechanism 1 for the edge folding portion and a folding mechanism 2 for expanding the edge opening.

As shown in FIG. 2, the gluing mechanism 1 of the opening part has one drive shaft 3 rotatably inserted through it, and moves forward and backward as the arm 6 rotates around a cam plate 4 fixed to the machine frame. A glue stick 5 is provided which freely rotates back and forth.

The gluing rods 5 are provided above a rotating shaft 8, which will be described later, and are used in pairs to apply glue to the folded edges of packaging bags. Gluing mechanism 1 of the opening part
The assembly of each part is as follows. An arm 6 is fixed to a mounting frame attached to the drive shaft 3 with a key, and a bearing sleeve 7 is fixed to one end of the arm 6. A rotating shaft 8 to which a glued rod 5 is fixed to one end is attached to the bearing sleeve 7. A bevel gear 9 is fixed to the other end of the rotating shaft 8 . In the middle of the arm 6, there is a bevel gear 1 at one end which meshes with the bevel gear 9.
0 is fixed to the shaft 12, and one end of the swinging arm 11 is fixed to the other end.
penetrates laterally. A cam follower 13 is pivotally attached to the other end of the swing arm 11.

The cam follower 13 is in constant contact with the cam plate 4 fixed to the machine frame and moves with the rotation of the arm 6. That is, the rotation of the arm 6 causes the cam follower 13 to intermittently reciprocate the swing arm 11, and in conjunction with the reciprocation of the swing arm 11, the shaft 12 and the bevel gear 10 rotate in a counterclockwise direction and a clockwise direction. The rotating shaft 8, which is integral with the bevel gear 9 which rotates alternately and is interlocked with the bevel gear 10, similarly rotates intermittently back and forth to rotate the glued rod 5.
Rotate back and forth intermittently. In the figure, 14 is a spring for press-fitting the cam follower 13 to the cam surface of the cam plate 4.

The opening opening/folding mechanism 2 includes two presser plates 21 and two pleat folding plates 22. It consists of a folding plate 23 and a drive mechanism for these. (See Figure 1.3.4). 2 presser plates 21
As shown in Figure 4, the bases are each pivoted to the machine frame 24
．． 25, and is provided so as to open and close slightly to the left and right when viewed from FIG.

The base portions 21a, 21a of the holding plate 21 are bent inward at right angles, and the top plates 27 of the upper and lower rods 26 shown in FIG. 5 are engaged with the upper portions of the base portions 21a, 21a. That is, when the top plate 27 is in the upper position, the left and right presser plates 21 are opened to the left and right by leaf springs (not shown), and when the top plate 27 is moved downward, both presser plates 21 are closed and the fourth presser plate 21 is opened.
As shown in the figure, the hands are in a state of clasping one's hands together. The upper and lower rods 26 that move up and down the top plate 27 are forced to move only downward by a cam 28 fixed to a drive shaft 50 via a cam follower rod 29 that is pivotally supported in the middle. bases 21a of left and right presser plates 21;
21a is fixed to the inner shaft cylinder 30 and outer shaft cylinder 31 shown in FIG. 5 so that each can rotate independently. Both shafts are concentric cylinders centered on the upper and lower rods 26, and are integrally equipped with a bevel gear 32 and a bevel gear 33 at the base of each shaft.

Both bevel gears 32 and 33 are connected to the grooved cam 34 shown in FIG.
The bevel gears 35 that are reciprocally rotated are meshed at the same time.

Is the groove cam 34 a drive? This grooved cam 3 is fixed to the JJ shaft 50.
4 is fixed to a drive shaft 50, a part of a sector gear 36 whose base is pivotally mounted on a luxurious frame is engaged with this grooved cam 34, and a flat part coaxial with the bevel gear 35 is further engaged with this sector gear 36. When the gears 3'7 engage (Fig. 3), the grooved cam 34
Due to the rotation, the sector gear 36 swings, which causes the bevel gear 35 to reciprocate and rotate the inner shaft cylinder 30 and the outer shaft cylinder 31.
is rotated 1° in the opposite direction, and the two presser plates 21 are operated in two modes: a state in which their palms are joined together, and a state in which they are rotated 90' from side to side. As shown in FIG. 1.3, the two extended bent plates 22 are located at the bottom of the presser plate 21, and their lower portions are each fixed to the base of the presser plate 21 with one side of the triangle being vertical. There is. Therefore, the pleat folding plate 22 also has the presser plate 21
The holding plate 21 is operated in two ways: the palms are in a closed position and the open position when rotated by 90°, but the surface of the holding plate 21 is
It is located on the side of the gluing mechanism with a slight distance from the surface of No. 2.

As shown in FIGS. 1 and 6, the folding temporary 23 is located in front of the presser plate 21 and the folding plate 22, and extends from below to above toward the center when the drawing plates 21 and 22 are opened. Move in a vertical plane. The folding plate 21 3 is the mounting piece 40
The base of the mounting piece 40 is pivoted to the machine frame 41.
The upper end of an uplifting rod 43 is pivotally mounted near it by another shaft 42. The upright lever 43 is guided in its vertical movement by the machine frame, and its lower portion engages with a 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, due to the rotation of the cam 44, the push-up rod 43 moves upward, and the mounting piece 40 is rotated upward about the pivot point 41, so that the front edge of the folding plate 23 is pressed against the presser plate 21.
and move it to near the center of the folded plate 22. The downward movement of the thrust rod 43 is caused by the tension of a spring 45 attached to the mounting piece 40.

A packaging bag 51 laminated into a tube shape as shown in FIG. 7 is supplied to the apparatus of the present invention. This packaging bag 51 is
The paper on both sides 52 has already been folded inward to form pleats 55 on both sides, which are made up of the overlapping of the side M52, the front paper 53, and the measuring paper 52 and the back paper 54 (in the figure, they are shaped like ■). . ``By forming the pleats 55, the pleat grooves 56. A groove bottom line 57 is formed. In addition, 58 is an opening, 59 is a bottom,
Reference numeral 60 indicates an opening sheet formed in a part of the opening.

FIG. 8 shows that both sides of the opening paper 60 of the opening 58 are glued, folded inward, and pasted on the front paper 53 and the back paper 54.
This shows the completed state of the fold. The operation of the device of the present invention will be explained based on FIG. 9.

(a) At the beginning of operation, both the presser plates 21 and the pleat bending plate 22 are in a state of palms together, and the upper and lower rods 26 are connected to the cam 28.
Since it is freely moving upward in relation to the presser plate 21
The upper part is slightly expanded by a leaf spring (not shown). In this situation, first, a tubular packaging bag 51 (hereinafter referred to as a packaging bag) is dropped and supplied from above with the opening 58 facing toward you and the opening 60 facing downward. Then, the groove bottom 11 of the packaging bag 51
57 (hereinafter, the packaging bag is omitted) are in contact with the opposing tops of both pleated folding plates 22, and the lower flaps 55 on both sides are located in the gaps between the pressing plates 21 and the pleated folding plates 22 on both sides, respectively.

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

(C) The bevel gear 35 is rotated within a predetermined range by the grooved cam 34 while the upper and lower rods 26 continue to move downward, so the holding plate 21 and the folding plate 22 are rotated in opposite directions by 90' left and right, respectively. . At this time, the folds 55 on both sides are formed on the folded folding plate 2.
2 and the holding plate 21, and is bent by 90' to the left and right by the folding plate, so that the opening is expanded. That is, in front of the folding plate 22 which is rotated by 90 degrees and opened, the sub paper 52 is stretched and the pleats 55 disappear, becoming a single flat sheet, and the opening is enlarged accordingly.

In reality, because the paper has tension, the width of the frontage is widened as shown in Figure 9 (c).

(d) Due to the operation of the gluing mechanism 1 of the folding part, 1. The gluing rod 5 rotates and glue is applied to both sides of the expanded opening paper.

Before this, the gluing mechanism 1 was in the state shown in FIG. 2, that is, with the gluing rod 5 rotated in the opposite direction to the opening opening folding mechanism 2, the glue 70 was applied to the tip of the gluing rod 5. Supplied. Then, as the drive shaft 3 rotates, the cam follower 13 is pressed against the cam plate 4 fixed to the machine frame by the force of the spring 14, and the cam follower 13 moves, causing the swing arm 11 to swing. Swinging, axis 1 for swinging arm 11
2 interlocks to rotate the bevel tooth width 10, and the bevel gear 1
The bevel gear 9 that engages with o rotates the rotating shaft 8 along with the rotation of the arm 6, and the glued rod 5 fixed to the tip of the rotating shaft 8 is connected to both inner parts of the expanded opening paper. , and glue 70 is applied to this part. After adhesion, the glued rod 5 is rotated in the opposite direction to the opening opening/folding mechanism by the operation of the cam 4,
On the side opposite to the opening opening folding mechanism 2, the rod 5 is pressed by a gluing tower device such as a glue dripping device, a glue absorber, or a glue jetting device.
Glue 70 is supplied to the tip.

(E) When the glued rod 5 leaves the front of the mouth expansion folding mechanism 2, the cam 44 immediately pushes the thrusting rod 43♂ upward, so the folding plate 23 is moved from below to the holding plate 21.
and quickly move toward the center of the pleated folding plate 22,
Fold the lower corner of the opening inward along groove line 57 at right angles.

Both inner parts of the opening paper 60 are adhered to the inner lower corners of the front paper 53 and the back paper 54 with glue 70.

(c) After the folding plate 23 quickly returns to its original position, the holding plate 21 and the pleated folding plate 22, which had been opened 90 degrees left and right, close again in a state of palms together by the action of the groove cam 34, and the folded part Bates folding is completed by perfecting the creases and adhesion of the opening paper. During this invasion, the upper and lower rods 26, which had been moved downward, are released from the restriction of the cam 28, and the presser plate 21, which is in the folded position, expands slightly at the top as shown in FIG. The completed packaging bag is taken out upwards,
The next tubular packaging bag is sent.

Effects of the Invention Since the present invention has the above-described structure and operation, the opening part of the packaging bag can be automatically and efficiently created by Bates folding, and the inside part of the opening paper can be folded between the front paper and the back paper. Since the inner surface is glued, the opening part remains securely folded inside the packaging bag.

This prevents the contents from leaking from the folded portion.

[Brief explanation of drawings]

1 is a side view schematically showing the entire main part of an embodiment of the present invention; FIG. 2 is a plan sectional view of a portion of the same; FIG. 3 is a side view of a portion of the same; FIG. is a partial front view of the same as above, Fig. 5 is a side view showing a part of the above in cross section, and Fig. 6 is a
FIG. 7 is a perspective view of the packaging bag; FIG. 8 is a perspective view of the same in another state; FIGS. 9 (a) to (f) show the order of operation. Illustration of a packaging bag. 1... Gluing mechanism, 2... Mouth enlargement folding mechanism, 3...
... Drive shaft, 4... Cam plate, 5... Glued rod, 6...
・Arm, 8, 12... Rotating shaft, 9, 10... Bevel gear, 11... Swinging arm, 13... Cam roller, 1
4... Spring, 21... Holding plate, 22... Folding plate, 23... Folding plate, 26... Upper and lower rods,
30... Middle barrel, 31... Outer barrel, 43... Groove cam, 43... Push-up lever, 51... Tubular packaging bag, 55... Fold, 57... Groove Bottom line.

Claims (2)

[Claims] (1) Fold the lower pleats of the packaging bag to the left and right to open the opening of the bag, and then fold the opening inward to make a Bates fold. On the other hand, in a packaging bag opening folding device equipped with an opening opening/folding mechanism consisting of a folding plate that rotates from below, the opening paper of the bag is 1. An opening folding device for a packaging bag, comprising a gluing mechanism having a gluing rod that can move forward and backward to abut on both inner sides of the bag and apply glue. (2) The gluing mechanism is configured to intermittently rotate the gluing rod in a reciprocating manner by transmitting intermittent reciprocating rotation of a swinging arm that swings according to a cam rotating around a drive shaft. Packaging bag opening device.