JPH0543567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is directed to a production line for can lids.
When packaging manufactured can lids for shipping,
The present invention relates to an automatic can lid bag opening folding device for folding the bag opening of a bag assembly of lids.

(Prior Art) Conventionally, as an automatic packaging device for can lids that automatically packs and packages can lids into cylindrical packaging bags, for example, one disclosed in Japanese Patent Application Laid-Open No. 50-5494 has been known. However, in the conventional device, the bag opening is sealed by simply folding the bag opening in one direction, which has the disadvantage that it is easy to open and the filled can lid assembly loosens and separates. For this reason, in conventional can lid manufacturing lines, the bagging of can lids is carried out by automatic equipment, but the folding of the bag opening to close the bag opening is currently done exclusively by hand. be. Manual folding of the bag opening is carried out by sequentially folding the bag opening from three directions, and finally inserting the tip of the upper folding surface between the folded parts. Thereby, the bag opening can be closed without using an adhesive or the like so that it cannot be easily opened.

The above-mentioned conventional method of manually folding the bag opening of a bag filled with can lids will be explained in more detail using FIGS. 1a to 1h.

In the state (a) in which the cylindrical bag 20 is stuffed with the can lid 28 and the bag opening is open, a portion A of the peripheral wall of the bag opening is pressed against the inner package from one direction with a finger to perform preliminary folding as shown in FIG. 2(b). Next, squeeze both sides of the preliminary fold with your fingers to create a strong, substantially U-shaped fold B to form the first fold surface 35 and bring it into the state shown in c. Thereafter, the left side of the fold B is pressed inward and the fold C is squeezed through steps d to e in the figure to form a second fold surface 36 that overlaps the first fold surface as shown in f. , further fold the rising part on the right side onto the second folding surface 36 from the fold D to form the third folding surface 37, and fold the part protruding from the second folding surface onto the fold E as shown in g of the same figure. By bending the tongue along the lower surface of the second folding surface 36 to form a tongue F, and sandwiching the tongue F between the first folding surface 35 and the second folding surface 36, as shown in h. Finish folding the bag so that it does not open on its own.

(Problems to be Solved by the Invention) As mentioned above, conventionally, the bag opening is folded in manually, which is extremely inefficient and requires many workers, resulting in high costs and, as mentioned above, Since the folding process is complicated, the size of the folded part becomes uneven, which causes problems such as troubles when packaging can lids packed into bags or opening the bags on the can manufacturing line. Ta.

The present invention was created in view of the above circumstances, and
It is an object of the present invention to provide a can lid bagging opening folding device which can completely automatically fold the bagging opening into the same form as conventionally done manually.

(Means for Solving the Problems) The structure of the can lid bag opening folding device of the present invention that solves the above problems will be explained using drawings corresponding to embodiments.

The can lid bagging opening folding device of the present invention is provided along a conveyance path along which can lid bagging bags with open bag openings are conveyed, and is arranged to accommodate can lid bagging bags 20 located on the conveyance path. A nearly semicircular hold cup 7 is arranged to move forward and backward relative to the outer periphery of the bag mouth to fold the bag mouth inward, and is freely movable to a position facing the hold cup 7 across the bag mouth. A first folding device 5 that forms a first folding surface 35 consisting of a hold spring 9 arranged; Knife 2 that presses the opening to form the second folding surface 36
6, a third folding device having an upper hold finger 16 for folding the remaining protruding portion of the bag opening onto the second folding surface to form a third folding surface 37, and the upper holder finger 16; At the same time as pressing the bag opening from the opposite side to the finger 16, the lift finger 34 is pressed against the knife 26 located between the first folding surface 35 and the second folding surface 36
has a lower hold finger 18 that lifts the second folding surface 36 from the first folding surface and folds the tip of the third folding surface 37 between the first folding surface and the second folding surface. The invention is characterized in that it is comprised of a fourth folding device.

(Function) The can lid bag filled in the cylindrical bag with the bag mouth open is transported and held by appropriate means to a position on the transport path where the first folding device is arranged. Then, the hold cup of the first folding device presses the outer peripheral surface of the bag opening to perform the first folding. Next, the hold spring descends, and the first folded surface folded by the hold cup is squeezed by the hold spring and the hold cup to form a strong crease. When the first folding is completed, the bag is transferred along the conveyance path to a position where the second to fourth folding devices are arranged, and is fixed at that position. At this position, the knife of the second folding device first acts on the bag opening from a direction substantially perpendicular to the first folding device, pressing the bag opening from the side and folding the second folding surface into the first folding surface.
Fold it onto the folding surface and perform the second fold. Next, the upper hold finger of the third folding device descends and presses down the remaining portion by sandwiching the bag opening with the knife, performs the third bag opening fold, and places the third fold on the second folding surface. The surfaces are overlapped. Thereafter, the lower hold finger rises and presses the tip of the third folding surface onto the upper hold finger. At this time, by slightly lifting the knife from the folding surface, the second and third folding surfaces resting thereon are lifted, creating a gap between them and the first folding surface. In this state, when the upper hold finger rises and separates from the lower hold finger, the lower hold finger
The tip of the folding surface is pushed under the second folding surface to complete the fourth folding.

By repeating the above steps, the bagging opening of the can lid is automatically folded through the first to fourth folding steps. The folding method is similar to the conventional method of folding by hand, by folding from three directions and finally pushing the tip of the top folding surface into the bottom of the second folding surface, so the bag opening can be easily loosened. It is possible to obtain bags that are folded to a uniform size without any burrs.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 2 is a front view of the device of this embodiment, and FIG. 3 is a right side view. In the figure, 21 is a table that constitutes a conveyance path for can lid bagging bags with open bag openings;
The first folding device 5 extends from the right to the left in the figure, and along the front end (the left end in FIG. 3), a first folding device 5 is provided at a second position, and second to fourth folding devices are provided at a third position. A folding device is provided. 3
is a first cover holder, 40 is a second cover holder, and the base ends of these cover holders are:
As shown in FIG. 3, a distance corresponding to the interval between each position is set on a shaft 44 provided on a carriage 43 that is guided by a guide bar 41 provided on the machine frame and driven back and forth by an appropriate drive device. It is fixed to brackets 42 and 45 (Figs. 3 and 6) which are rotatably provided, and a pair of holding pieces are attached to the upper ends of the brackets to contact and hold the outer periphery of the bagged can lid assembly. 4
6, 47 are provided, and the first cover holder 3 moves between the first position and the second position with the second cover holder 40
is intermittently driven back and forth between the second position and the third position. Then, by means of a cylinder mechanism (not shown) or the like, the holding piece protrudes onto the table to a position where it holds the package, and rotates counterclockwise in FIG. The bag is rotated between a position where the bag is released and a position where the holding of the bag is released.

As shown in Fig. 2, the first cover holder 3 has a structure in which when the cover holder is rotated toward the table, it protrudes slightly above the table surface and the bag opening is slightly inward from the bottom of the outside. An auxiliary array plate 4 is fixed in order to perform preliminary folding by pressing and recessing. The preliminary folding device 1 is constructed by the auxiliary plate 4 and the bagging finger 2 (FIG. 4) which is provided at the first position and thrusts into the bag opening of the packaging bag to maintain the bag opening in an open state. is configured.

On the other hand, a protector plate 22 is fixed to the second cover holder 40 and has an edge that serves as a reference point 27 for holding down the first folding surface of the bag opening and forming folds on the second and third folding surfaces. At the same time, as shown in Figures 5 and 6, the fourth
Lift fingers 34 are provided for lifting the second and third folding surfaces for folding. The lift finger 34 has an intermediate connecting portion 48 that is bendably connected, a base end 49 that is pivoted to the cover holder main body, and a lower half of the lift finger 34 that is bent forward and extends downward from the base end. The pressing lever 50 is fixed, and the lower half is normally in a straight line along the cover holder body.
As will be described later, when the pressing lever 50 is pressed with the knife 26 hanging heavy on the upper half, it bends from the intermediate connecting portion 48 in a dogleg shape and serves to slightly float the knife.

30 is a shaft for rotationally driving the hold cup 7 at the second position and the lower hold finger 18 at the third position, and as shown in FIG. 3, the base end is swingably attached to the machine frame. cylinder 3
It is connected to a link 52 connected to the tip of the second cylinder rod 51, and rotates approximately 90 degrees by operating the cylinder 32. The hold cup 7 is inserted into the first bag by pushing the bag opening from below.
It is for forming a folding surface 35, and has a semicircular upper surface, and is fixed to a cylinder rod of a cylinder 6 attached to a bracket 31 fixed to the shaft 30.

9 is a hold spring provided on the rod of the cylinder 8 fixed above the second position;
The first folding device 5 together with the hold cup 7
Configure.

The lower holding finger 18 constitutes a fourth folding device, and is provided on the rod of the cylinder 17 attached to a bracket 23 fixed to the shaft 30, and as the shaft 30 rotates, it is moved as shown in FIG. It swings in a direction perpendicular to the plane of the paper, and can be moved up and down by operating a cylinder 17. Further, the bracket 23 is provided with a push bolt 33 for pressing the pressing lever 50 of the lift finger 34 when the bracket is rotated (FIG. 6).

16 is an upper holding finger provided above the third position, and the cylinder 1 is adjustably attached to a bracket 24 fixed to the machine frame.
It is fixed to the rod No. 5 and is adapted to act on the bag opening from above, and constitutes a third folding device.

Reference numeral 26 denotes a knife that acts on the bag opening from the side in the third position to fold it in, and the lower end is attached to the tip of the knife lever 14 fixed to the rotating shaft 12.
Configure the folding device. The rotation shaft 12 is rotationally driven by a rotary cylinder 11 provided on the machine frame. The knife lever 14 is formed with a cylinder mounting piece 53 that protrudes to the left in FIG. There is. block plate 25
is provided to prevent the bag from tearing when folded by the knife 26, and is a block plate lever whose lower end is rotatably supported by the shaft 12 and whose middle part is connected to the rod of the cylinder 19. It is fixed to the upper end of 13. Therefore, the block plate 25 can be rotated together with the knife 26 by rotating the shaft 12, and can be rotated independently by driving the cylinder 19.

Next, the bag opening folding process performed by the can lid bagging opening folding device of this embodiment configured as described above will be explained. Figures 7 to 11 show the folding process; Figure 7 is an intermediate view of the first folding process, Figure 8 is an intermediate view of the second folding process, and Figure 9 is a view of the third folding process.
10 and 11 are intermediate views of the fourth folding process, and in these figures, the part where the folding surface of the bag opening is visible is hatched for easy identification.

Initially, the first cover holder 3 is located in the first position, the second cover holder 40 is located in the second position, and the respective holding pieces 46 and 47 are in the inactive position below the table surface. Bag 2 filled with can lids in this state
0 is conveyed to the first position of the table 21 by appropriate means, the bagging finger 2 placed at the first position enters and maintains the open state of the bag opening, as shown in FIG. At the same time, the shaft 44 supporting the cover holder rotates, the first cover holder 3 rotates, and the holding piece 46 supports and holds the bag 20 from the outside. At that time, the lid bag filling finger 2 and the auxiliary alley plate 4 attached to the first cover holder 3 sandwich the inside and outside of the bag 20, so that the tip of the auxiliary alley plate 4 is at the point A of the bag 20. Press the part and pre-fold the opening as shown in Figure 1b.

When the preliminary folding is completed, the bagging finger 2
is removed from the bag opening, and then the carriage 43 is driven by an appropriate drive device, and the first cover holder 3 is moved to the second position while holding the bag. At the same time, the second cover holder 40 naturally moves to the third position.

When the bag moves to the second position, the cylinder 32 is actuated to raise the cylinder 6 of the first folding device 5 located at the second position, positioning the hold cup below the bag opening, and raising the cylinder 6. This action causes the hold cup to rise and perform the first folding (see FIG. 7), thereby forming the first folding surface 35. In addition, the cylinder 8 also operates to lower the hold spring 9, and the hold spring 9 holds the rising portions on both sides of the first folded surface folded with the hold cup.
and the hold cup 7 to form a strong crease B in the state shown in FIG. 1c.

When the first folding is completed, the cylinder 6,
8 and 32 are actuated to separate the hold cup 7 and hold spring 9 from the bag, and the shaft 44 rotates to move the first cover holder 3 and second cover holder 40 away from the bag holding position to open the bag. After that, the carriage 43 moves to the right in FIG.
The first cover holder 3 returns to the first position and the second cover holder 40 returns to the second position, and the shaft 44 is rotated again so that the first cover holder holds the bag in the first position and the second cover holder returns to the second position. After the first folding is completed, the bag is held in the second position.

When the second cover holder 40 rotates to hold the bag 40, the protector plate 22 provided on the second cover holder is pressed against the upper part of the first folding surface as shown in FIG. The reference point 27 becomes the reference point for subsequent crease formation.

In this state, the moving table 43 moves and the second cover holder 40 reaches the third position. Bag 2 in 3rd position
When 0 is transferred, the rotary cylinder 11 operates to rotate the rotation shaft 12, thereby
The knife lever 14 fixed to the rotation shaft 12 is rotated, and the knife 26 is rotated so as to act on the bag opening in a direction substantially perpendicular to the first folding device. A cylinder mounting piece 53 is attached to the knife lever 14.
At the same time, the cylinder 19 attached to the cylinder mounting piece is activated, and the block plate 25 rotatably provided on the rotation shaft 12 is rotated.
is rotated to act on a position closer to the outside of the bag opening before the knife 26. Next, knife 26
acts on the bag opening inward from the acting position of the block plate 25, and presses the bag opening from the side so as to sandwich the bag opening with the protector plate 22. As a result, the bag opening is determined based on the reference point 27 of the protector plate 22 and the left inclined surface as shown in FIG.
, and is folded as shown in e, and a crease line D is formed as shown in the figure f by the knife 26, and the second
Bag folding is performed to form a second folding surface 36 (see FIG. 8). The block plate 25 is
This is adopted to prevent the bag from being torn by the knife 26, and after the second bag folding process is completed, the cylinder 19 is operated to return to the original position.

Next, as shown in FIG. 9, the cylinder 15 is activated and the upper hold finger 16 is lowered.
Hold the bag opening between the knife 26 and the portion above the line D in FIG. .

After that, the cylinder 32 operates and the rod 28
The shaft 30 rotates via the lower hold finger 18 presses the third folding surface tongue piece F onto the upper hold finger 16.

At this time, the push bolt 33 attached to the bracket 23 hits the pressing lever 50 of the lift finger 34, bending the lift finger 34 from its intermediate connection part into a dogleg shape, and lifting the second folding surface. The knife 26 resting on it is lifted up (see Figures 6 and 11).
(Fig.) to raise the third folding surface and create a gap between it and the protector plate 22.

After that, the cylinder 15 is actuated and the upper hold finger 16 rises, and when it comes off the lower hold finger 18, the lower hold finger 1
8 is the protector plate 22 from the tongue piece F of the bag opening, that is, the part below the part raised by the knife 26.
(Figures 10 and 11). In this state, when the cylinder 17 is operated and the lower hold finger 18 is raised, the tongue piece F is held at its tip.
Push the knife 26 under the crease B (Fig. 1g)
A fold line E along the lower side of is formed, and the fourth fold is completed.

Next, the cylinders 17 and 32 are operated, the lower hold finger 18 is retracted, the lift finger 34 is returned to its original state, and the knife 26 is released from floating. Thereafter, the upper holding finger 16 is lowered again by the cylinder 15, and presses again the portion where the fold after folding the fourth bag has been raised. Finally, upper hold finger 16,
The knife 26 returns to its original position and the bag folding is completed.

Meanwhile, in the second position, the first folding device is performing the first folding of the next bag.
When the folding is completed, the second cover holder releases the bag and returns to the second position again.

By repeating the above steps, the bagging opening of the can lid is automatically folded one after another.

Although the embodiments of the present invention have been shown above, the present invention is not limited to the above embodiments, and various design changes are possible. For example, although the preliminary folding device is provided to smoothly perform the first folding, it is not necessarily necessary. Similarly, the block plate is also used to smoothly perform the second folding, and is not necessarily necessary. Furthermore, the second
The transportation of the bag from the third position to the third position is not limited to the above embodiment, and any appropriate means may be used, and any appropriate means may be used to hold the bag at those positions.

(Effects) The present invention achieves the following special effects with the above configuration.

By providing the first to fourth folding devices, it is possible to reliably perform the first to fourth folding in sequence, and it is possible to automatically fold the bag opening into the same form as conventionally done manually. It became.
As a result, we were able to dramatically improve the efficiency of can lid bagging and packaging work.

In addition, the tip of the third folding surface is sandwiched between the first folding surface and the second folding surface to create a strong package, so it will not open accidentally during transportation, and it will be folded into a uniform size. Therefore, the packing and unpacking work can be done smoothly, and the line speed can be increased.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the bag opening folding procedure by the bag opening folding device of the present invention, Fig. 2 is a front view of one embodiment of the folding device, and Fig. 3 is the same. The right side view, FIG. 4 is a side view showing the operating state of the preliminary folding device section, FIG. 5 is a front view showing the operating state of the second to fourth folding device sections, and FIG. 6 is the floating of the lift finger. Side views showing the state. Figures 7 to 11 are folding process diagrams. Figure 7 is a diagram halfway through the first folding process, Figure 8 is a diagram halfway through the second folding process, and Figure 9 is a diagram showing the end of the third folding process. 10 and 11 are intermediate views of the fourth folding step. 1: Preliminary folding device, 3: First cover holder, 5: First folding device, 7: Hold cup, 9: Hold spring, 16: Upper hold finger, 18: Lower hold finger,
20: bag, 21: table, 22: protector plate, 25: block plate, 26: knife, 34: lift finger, 40: second cover holder.

Claims (1)

[Claims] 1. A bag is installed along a conveyance path along which a bag for filling can lids with an open bag mouth is conveyed, and moves forward and backward from the outer periphery of the bag mouth of the can lid bagging bag located on the conveyance path to open the bag mouth. A first folding surface formed by a substantially semicircular hold cup disposed so as to be folded inward, and a hold spring movably disposed opposite to the hold cup across the bag opening. a second folding device, and a second folding device having a knife disposed downstream of the first folding device and configured to press into the bag opening from a direction substantially perpendicular to the direction of folding by the first folding device to form a second folding surface; , a third folding device having an upper hold finger that folds the remaining protruding portion of the bag opening onto the second folding surface to form a third folding surface, and pressing the bag opening from the side opposite to the upper holder finger; At the same time, a lift finger is applied to a knife located between the first folding surface and the second folding surface to lift the second folding surface from the first folding surface, and
A can lid bagging opening folding device comprising a fourth folding device having a lower holding finger for folding the tip of the third folding surface between the folding surface and the second folding surface. .