JPH039862B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention prevents the blank from floating in the blank folding process in an automatic box making machine, and when the width of the blank in the advancing direction is narrow. This invention relates to a device for preventing blanks from floating and for maintaining bent portions, which does not interfere with automatic box making.

[Prior art and its problems] In general, as shown in FIGS. 5A to 5G, for example, cuts 1 and folds 2 to 13 are formed in a rectangular blank A to form a bottom plate 14, a right side plate 15,
The left side plate 16, the front side plate 17, the rear side plate 18, and the connecting pieces 19 to 22 are conveyed without stopping from one side of the table to the other by a plurality of pairs of upper and lower conveyor belts. In the middle, the connecting piece 20 and the connecting piece 21 are folded from their folds 7 and 8, and the connecting piece 19 and the connecting piece 22 are folded from their folds 6 and 8.
9, fold the front side plate 17 from its fold line 3, and at the same time reverse the corners from folds 11 and 12 and bend it, bend the rear side plate 18 from its fold line 5, and at the same time fold it. 10 and 13, the corner portions are reversed and bent, and the front side plate 1 is reversed and bent as described above.
Glue 23 is applied to each corner of 7 and rear side plate 18, and finally, right side plate 15 and left side plate 16 are folded from their folds 2 and 4, and the folded box B is glued and folded. is known to be manufactured.

However, no mechanism is provided to prevent the blank from floating when the rear side plate 18 is bent with a back finger from the fold 5 in the blank A shown in FIGS. If the longitudinal width in the traveling direction is narrow, the rear side plate 18 will start to be bent from the fold 5 before the front side plate 17 is completely bent 180 degrees from the fold 3 with a hook or the like. However, in this case, there is no mechanism for maintaining the front side plate 17 bent at an acute angle.

Therefore, when folding the rear side plate 18 from the fold line 5, if the blank A is made of cardboard such as cardboard, the rear side plate 18 should have a restoring force at the fold line 5, and the rear side plate 18 should be folded from the bottom with a back finger. Since the width of the rear side plate 18, that is, the left-right width a of the bottom plate 14 becomes larger, the center of the rear side plate 18 increases when the rear side plate 18 is bent. part and the bottom plate 1 connected to it
There is a problem in that the central portion of 4 also floats up, and the fold 5 is bent into a curved line like the fold line 5a, resulting in product loss.

In addition, if the front and rear width b of the bottom plate 14 of the blank A in the direction of movement is narrow, from the fold 3 to the front side plate 1
The positional relationship between the hook for folding the bottom plate 14 of the blank A and the back finger for folding the rear side plate 18 from the fold line 5 must be such that the distance between them does not hinder their respective operations. There is a certain limit to the front-to-back width b.

That is, in order to maintain this bent state after the front side plate 17 is bent 180 degrees, a clamping body such as a fixing plate or a bar must be installed on the guide rail to clamp the blank A being conveyed. Therefore, when the rear side plate 18 is bent, at least the front side plate 17 is bent and held by the holding bodies, and at the same time, the rear side plate 18 is also held by the holding bodies. Even if the bottom plate 14 is bent 180 degrees, the front-to-back width b of the bottom plate 14 is small, and the front-to-back width b of the bottom plate 14 is regulated by the conveyance speed of the blank A. It is difficult to bend blank A, which is extremely narrow in that the longitudinal width b of the bottom plate 14 is the sum of the longitudinal widths of the front side plate 17 and the rear side plate 18, with the method of bending blank A using a hook and a back finger. Even if these adjustments can be made, the distance between the hook and the back finger must be adjusted every time the front and rear width b of the bottom plate 14 differs, and the timing of these operations must be finely adjusted, making it difficult to manufacture boxes of a wide variety of small quantities. is a huge time loss,
The problem was that it was inefficient.

[Summary of the Invention] The present invention solves the above-mentioned problems, prevents the central part of the blank from floating in an automatic box making machine, and produces a uniform product without causing loss.
The present invention also aims to provide a device for preventing floating of a blank and maintaining a bent portion, which makes it possible to easily and efficiently bend a blank having a narrow bottom plate in the direction of movement during conveyance processing of the blank. ,
A blank with folds formed in predetermined positions is automatically folded along each fold while being conveyed from one side of the table to the other by a conveyor such as a conveyor belt, and a folding box is created. In the automatic box making machine to be manufactured, a suction box is installed on the lower surface of the non-folding blank portion at a position where the blank is bent from a fold formed in a direction intersecting the traveling direction of the blank. From the position of the hook that bends the blank on the tip side during the fold formed in the direction intersecting the traveling direction of the blank, there is a conveyor belt or a bending maintenance guide bar that clamps the bent part of the folded blank. A brush is installed at a position above the blank extending up to the position of the clamping part of the clamping body and in contact with the upper edge of the bent blank.

[Example] An example of the blank floating prevention and folded part maintaining device according to the present invention will be described with reference to the attached drawings.

As shown in the fourth figure, a bottom plate 14, a right side plate 15, a left side plate 16, a front side plate 17, a rear side plate 18, and connection pieces for connecting each side plate are attached to a rectangular blank A made of cardboard or other thick paper in advance. 19
A rectangular blank A formed by slits 1 and folds 2 to 13 is made up of a pair of upper and lower parts, as shown in FIGS. 1 to 4.
It is transported without stopping by a set of transport belts 24 and 25 while sliding on a set of parallel guide rails 26 and 27.

At the process position where the rear side plate 18 is bent from the fold 5, the conveyor belts 24, 25 are connected to the connecting piece 1.
9 to 22 sandwich the bent right side plate 15 and left side plate 16, and guide rails 26 and 27 are located below the bottom plate 14.

While the blank A is being conveyed by the conveyor belts 24 and 25, as shown in the first figure, a fold formed in a direction perpendicular to the traveling direction of the blank A, that is, a rear side plate 18 is guided from the fold 5. In front of the back fingers 28 installed on both outer sides of the rails 26, 27, the blank floating is prevented between the guide rails 26, 27 on the lower surface of the bottom plate 14, which is the unbent blank part of the blank A. A suction box 29 is installed. This suction box 29 is provided with a suction port 30 on the top surface.
While the automatic box making machine is in operation, suction continues at all times.

Between the conveyor belt 24 and the guide rail 26, and between the conveyor belt 25 and the guide rail 27, the front side plate 17 and the rear side The corner of the face plate 18 is reversely bent, and the front side plate 17 and the rear side plate 18 are bent 180 degrees, so that the side surface is V-shaped, and the tip is inclined to the position of the conveyor belts 24 and 25. Corner inversion bending guides 31 and 32 are installed.

In the longitudinal direction (blank advancing direction) between the corner reversal bending guides 31 and 32, a hook 34 is formed in which the front side plate 17 of the blank A is bent rearward at a right angle or more from the fold 3 by a hook 34, which will be described later. From the position, the front side plate 17 is the corner inversion bending guide 3
1, the position that reaches near the tip of 32 and is not restored,
That is, the front side plate 17 is bent at an acute angle of 45° or more and is bent above the range up to the position where it is sandwiched between the guide rails 26, 27 and the corner reversing bending guides 31, 32. A brush 33 is installed at a height where the upper edge of the front side plate 17 of the blank A contacts.

In addition, the front edge of the front side plate 17 of the blank A that has been conveyed is hooked to the entrance portion of the blank A in the corner reversal bending guides 31 and 32.
As the blank A continues to be conveyed, the front side plate 17 is bent from its fold 3, and the corners of the front side plate 17 are also reversely bent by the corner reversing bending guides 31 and 32, and at the same time, the front side plate 17 itself is A hook 34 made of a leaf spring for bending the front side plate 17 is provided, the arm of which is bent upward against the elasticity of the hook. Therefore,
For example, as shown in FIGS. 1 to 4, when the front side plate 17 is folded from the fold 3 and the rear side plate 18 is folded from the fold 5, the conveyor belts 24 and 25 transport the front plate 17 to the position of the hook 34. The front edge of the blank A, that is, the front edge of the front side plate 17, is hooked on the hook 34 as shown in FIG. Then, the hook 34 bends its arm upward against its elasticity, bending the front side plate 17 from the fold 3, and at the same time, the corners of the front side plate 17 also bend from the folds 11 and 12. Song guide 31,
It is reversely bent by 32.

When the blank A is further conveyed forward by the conveyor belts 24 and 25, the front side plate 17 is bent rearward from the right angle, as shown in FIG. Then, the hook 34 returns to its original state due to its elasticity, and the front side plate 17 is conveyed forward while being rubbed at its upper edge by the brush 33 while being bent at an acute angle.

Next, when the rear side plate 18 of the blank A is conveyed to the operating position of the back finger 28,
The back finger 28 is the rear side plate 1 of blank A.
8 and rotates in synchronization with the conveyance speed of the conveyor belts 24 and 25, and moves the rear side plate 18 along its fold 5.
At the same time, bend the rear side plate 18 to 180 degrees.
The corner portions are also reversely bent from the folds 10, 13 by the corner portion reversing bending guides 31, 32.

During this time, the lower surface of the bottom plate 14 of the blank A is being sucked into the suction port 30 of the suction box 29, so as shown in FIG.
Even if the back finger 28 operates to push up the rear side plate 18 from below, the center portion of the bottom plate 14 will not float up together with the center portion of the rear side plate 18, and the rear side plate 18 will be correctly bent from the fold 5. Even if the left and right width a of the bottom plate 14 becomes wider, the fold line 5
Even if the front and back width b of the bottom plate 14 is narrow, the front side plate 17 is bent at an acute angle and the rear side plate 18 is bent at an acute angle while the brush 33 maintains the bent state. backfinger 28
There is no need to adjust the distance between the back finger 28 and the hook 34, and the hook 34
There is no problem in the operation of the back finger 28 after the operation.

When the rear side plate 18 is completely bent by the back finger 28, as shown in FIG. The upper edge portion is released from rubbing against the brush 33.

In this embodiment, a suction box 29 is provided to prevent the bottom plate 14 of the blank A from floating when the rear side plate 18 of the blank A is bent from the fold line 5 with the back finger 28. For example, when the front side plate 17 of the blank A is folded from the fold line 3 with the hook 34, or when the blank A is folded from a fold formed in a direction intersecting the traveling direction of the blank A, for example, It is obvious that a suction box can also be used to prevent the blank A from floating when the blank A is bent by installing a suction box in an unbent blank portion such as the bottom plate 14 of the blank A.

[Effects of the Invention] Since the present invention has the above-mentioned configuration and functions, when a blank is folded from a crease formed in a direction intersecting the advancing direction of the blank, the left and right sides of the folded portion Regardless of the width, it can be folded correctly from the crease, there is no risk of product loss, and uniform products can be efficiently produced, and the front and back width of the bottom plate in the direction of blank travel is narrow. Even in such cases, the folding process can be performed automatically, and various types of folding boxes can be efficiently manufactured using a single automatic box making machine.

In addition, if the length of the brush is made long to a certain extent, even if the width of the bottom plate of the blank in that range is changed, it can be easily handled by simply adjusting the activation timing of the back finger, and the distance between the hook and back finger can be easily adjusted. Since it is not necessary, production efficiency will not be reduced even when making boxes of a wide variety and in small quantities.
Furthermore, as a device for preventing the blank from floating and maintaining the bent portion, it is sufficient to simply install a suction box and a brush at a predetermined position.
It can be easily installed on existing automatic box making machines, making it suitable as a device for preventing blanks from floating and maintaining bent portions.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the apparatus for preventing blank floatation and maintaining a bent part according to the present invention. FIG. 1 is a plan view of the blank conveyed to the suction box and back finger positions; Figure 2 A to E are diagrams of the operation of the hook and back finger when folding the front and rear side plates; Figure 3 is a side view of Figure 2 B with the hook removed; Figure 4 is a plan view of the blank; FIGS. 5A to 5G are explanatory diagrams of the folding and gluing process of the folding box. A... Blank, B... Folding box, 1... Notch, 2 to 13... Fold, 24, 25... Conveyor belt, 28... Back finger, 29... Suction box, 33... Brush, 34... Hook.

Claims (1)

[Claims] 1. A blank with folds formed in advance at predetermined positions is automatically folded along each fold while being conveyed from one side of the table to the other by a conveyor such as a conveyor belt, forming a folding box. In an automatic box making machine in which the blank is manufactured, a suction box is installed on the lower surface of the non-folding blank part at the position where the blank is bent from the fold formed in the direction intersecting the direction of travel of the blank, and In a fold formed in a direction intersecting the direction of travel of the blank,
From the position of the hook that bends the blank on the tip side,
The upper edge of the folded blank extends above the conveyor belt that clamps the folded part of the blank, or the clamping part of a clamping body such as a bending maintenance guide bar. A device for preventing a blank from floating and maintaining a bent portion, characterized in that a brush is installed at a position where the blank comes into contact with the brush.