JPH036422Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is designed to prevent problems in automatic box making even when the width of the blank in the advancing direction is narrow in the blank folding process in an automatic box making machine. The present invention relates to a device for maintaining the folded portion of a blank.

[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 3, and at the same time reverse and bend the corners from the folds 11 and 12, bend the rear side plate 18 from its fold 5, and at the same time fold it. 10 and 13, the corners are reversed and bent, and glue 23 is applied to each corner of the side plate 17 and rear side plate 18 that have been reversed and bent, and finally the right side plate 15 and the left side It is known that a folding box B is produced by folding the face plate 16 along the folds 2 and 4, gluing it, and folding it.

However, if the front and rear width b of the bottom plate 14 of the blank A shown in FIGS. Although the rear side plate 18 starts to be bent from the fold 5, there is no mechanism for maintaining the front side plate 17 bent at an acute angle in this case.

Therefore, when the longitudinal width b of the bottom plate 14 of the blank A in the traveling direction is narrow, a hook for bending the front side plate 17 from the fold 3 and a back finger for folding the rear side plate 18 from the fold 5 are provided. Since the positional relationship between the blank A and the bottom plate 14 must be maintained at a distance that does not hinder their operations, there is a certain limit to the longitudinal width b of the bottom plate 14 of the blank A.

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, the rear side plate 18 is bent at least so that 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 bent 180 degrees and held by the holding bodies. Even if it is bent, the longitudinal width b of the bottom plate 14 is small, and the longitudinal width b of the bottom plate 14 depends on the conveyance speed of the blank A.
Since the front and back width b of the bottom plate 14 is extremely narrow, such as the sum of the front and back widths of the front side plate 17 and the rear side plate 18, it is possible to fold the blank A using a hook and a back finger. This is difficult with the method of bending, and even if these adjustments could be made, the distance between the hook and the back finger must be adjusted every time the front and back width b of the bottom plate 14 differs, and the timing of these operations must be finely adjusted. When producing boxes of a wide variety and in small quantities, there was a problem in that there was a significant loss of time and it was inefficient.

[Summary of the invention] The present invention solves each of the above-mentioned problems and enables easy and efficient bending of blanks whose bottom plate is narrow in the direction of movement during conveyance processing of blanks in an automatic box making machine. The purpose of the present invention is to provide a device for maintaining the folded part of a blank, in which a blank with folds formed in a predetermined position is transported from one side of the table to the other by a conveyor such as a conveyor belt. , in an automatic box making machine that automatically folds along each fold to produce a folding box.
In the fold formed in the direction intersecting the traveling direction of the blank, from the position of the hook that folds the blank on the tip side, a conveyor belt or a folding maintenance guide that clamps the folded part of the folded blank. It is characterized in that a brush is installed at a position above the blank extending up to the position of the clamping part of the clamping body such as a bar and in contact with the upper edge of the bent blank.

[Example] An example of the blank folded portion 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 a connecting piece 19 for connecting each side plate are attached to a rectangular blank A made of thick paper such as cardboard in advance. As shown in FIGS. 1 to 4, a rectangular blank A having slits 1 and folds 2 to 13 is conveyed by a pair of upper and lower conveyor belts 24 and 25. It is transported without stopping 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 belt 2
4 and 25 sandwich the right side plate 15 and left side plate 16 portions where the connecting pieces 19 to 22 are bent, 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
The front side plate 17 is bent at an acute angle of 45° or more and is held between the guide rails 26, 27 and the corner reversing bending guides 31, 32. A brush 33 is installed above the range up to the position where the upper edge of the front side plate 17 of the bent blank A comes into contact with the brush 33.

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, the front side plate 17 is bent from the fold line 3,
When folding the rear side plate 18 from the fold 5, the blank A that has been conveyed by the conveyor belts 24 and 25 to the position of the hook 34 is bent at its front edge, that is, the front of the front side plate 17, as shown in FIG. The edge is hooked to the hook 34, and the blank A is placed on the conveyor belt 2.
4 and 25, the hook 34 bends its arm upward against its elasticity, bends the front side plate 17 from the fold 3, and at the same time folds the front side plate 1
The corner portions 7 are also reversely bent from the folds 11 and 12 by the corner portion reversal bending guides 31 and 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 brush 33 maintains the bent state. 18 by the back finger 28, there is no need to adjust the distance between the back finger 28 and the hook 34, and the operation of the back finger 28 after the hook 34 is operated will not be hindered.

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.

[Effects of the invention] Since the present invention has the above-mentioned configuration and functions, it is possible to automatically perform the bending process even when the front and back width of the bottom plate in the direction of movement of the blank is narrow. A single automatic box making machine can efficiently produce a wide variety of folding boxes.

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 changes, it can be easily handled by simply adjusting the activation timing of the back finger, and it is not necessary to adjust the distance between the hook and the back finger. Therefore, there is no reduction in production efficiency even when manufacturing boxes of various types and small quantities.

Furthermore, since it is sufficient to simply install a brush in a predetermined position as a device for maintaining the folded portion of a blank, it can be easily installed on an existing automatic box making machine, making it suitable as a device for maintaining the folded portion of a blank. It is.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the blank folded part maintaining device according to the present invention, in which FIG. 1 is a plan view of the blank conveyed to the suction box and back finger positions, and FIG. A to E are diagrams of how the hook and back finger operate when folding the front and rear side plates, Figure 3 is a side view of Figure 2B with the hook removed, Figure 4 is a plan view of the blank, and Figure 5. A to G 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, 33...
Brush, 34...futsuk.

Claims (1)

[Scope of utility model registration request] 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, the bent portion of the bent blank is held between the folds formed in the direction intersecting the traveling direction of the blank from the position of the hook that bends the blank on the tip side. A brush is installed at a position that touches the upper edge of the folded blank above the blank that extends up to the position of the holding part of the holding body such as the conveyor belt or the bending maintenance guide bar. Blank folding section maintenance device.