JP2816970B2 - Rear flap bending device in box making machines, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box making machine for manufacturing a box made of cardboard, plastic sheets, etc. The present invention relates to a rear flap bending device for bending a flap.

[0002]

2. Description of the Related Art A rear flap bending device in a box making machine or the like generally has a conveying device for horizontally conveying a material sheet and conveying the material sheet forward, and a finger bar which rotates in synchronization with the material sheet. The finger bar tip is configured using a back finger device that pushes the rear flap of the material sheet upward from the lower rear to the upper front, and bends the rear flap upward and forward along the horizontal folding line.

In the backfinger device, at the beginning of the operation of bending the rear flap, that is, when lifting the rear flap, if the front of the rear flap rises, it becomes difficult to bend. Therefore, a floating prevention device for preventing this floating is essential.

Conventionally, as this floating prevention device, a bar is provided at the front of the rear flap, which is lowered from above, and the bar is supported by a spring. Enabled devices are used. In this device, when the lower end of the rod presses the front part of the rear flap of the material sheet and bends the rear flap, the rod is pushed by the rear flap and the finger bar, swings and retracts. is there.

[0005] In addition, a floating-preventing device is also used in which a propeller-like plate body which rotates around the side of the material sheet is provided, and the plate is rotated in synchronization with the material sheet to press the front part of the rear flap. Have been.

[0006] In use of these floating prevention devices,
It is necessary to set the mounting position precisely,
You have to make fine adjustments to the left, right, up and down. For this reason, when changing the size and shape of a box or the like to be manufactured, a great deal of labor and time are required for the setup work.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to simplify the work of setting up the device for preventing surfacing and to quickly and easily respond to changes in the size and shape of a box or the like to be manufactured. It is intended for.

[0008]

In the rear flap bending apparatus of the present invention, an air outlet is used as the above-mentioned floating preventing device, and the front part of the rear flap is pressed by the air blown out from the air blowing port to prevent floating. Things.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The rear flap bending apparatus according to the present invention is provided with a further auxiliary air outlet at a position in front of the air outlet, and blows air toward the rear of the upper surface of the material sheet. You can also. With this configuration, if there is another flap that has already been bent backward in front of the rear flap, the other flap is prevented from being pushed back forward by the air flowing from the air outlet to the front. Can be. Of course, if there is no such flap, if the other flaps are sufficiently far away, and if there is no danger that the other flaps will return due to the nature of the material sheet, the air blowing from this auxiliary air blowing port Is unnecessary, and the installation of the auxiliary air outlet can be omitted, or even if it is provided, it can be used.

[0010] It is preferable to intermittently blow air from the air blowing port in synchronization with the conveyed material sheet so that the air is blown only when the rear flap is bent, since the amount of air can be saved. .

In the case of high-speed operation, it is preferable to continuously blow air from the air outlet because the operation is stabilized.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described with reference to the drawings.

The rear flap bending device 10 constitutes a part of a box making machine. In this box making machine, FIG.
The box 12 is manufactured by processing the cardboard material sheet 11 as shown in FIG. That is, the material sheet 1 of FIG.
First, the front glue flaps 13 and 13 'are bent backward (B in the same drawing) while conveying 1 horizontally (to the left in the figure), and then the rear glue flaps 14 and 14' are folded forward. Bend (C in the same figure). Thereafter, the front side flap 15 is bent backward, and at the same time, both corner portions 16, 16 'of the front side flap 15 are bent forward (FIG. D). next,
The rear side flap 17 is bent forward, and at the same time, both corners 18, 18 'of the rear side flap 17 are bent rearward (FIG. E). After this, the left and right side flaps 1
9 and 19 ′ are bent inward to form the two corners 16 and 16 ′ of the front side flap 15 and the two corners 1 of the rear side flap 17.
The front and rear glue flaps 13 and 13 'and the rear glue flaps 14 and 14' are bonded to each other to complete the folded box 12 (FIG. F).

The rear flap bending apparatus 10 is used in a process of bending the rear glue flaps 14 and 14 'forward to bring the state shown in FIG. 4C.

A transfer device 20 is provided at the center of the rear flap folding device 10. This transfer device 20
Consisting of conveyor belts 21, 21 ', 22, 22',
The material sheet 11 is held horizontally, and the two central portions are sandwiched from above and below, and are conveyed forward (to the left in FIGS. 1 and 2). further,
On both sides of these conveyor belts, support guides 23, 23 'for placing the ends of the material sheet 11 are provided. Further, above the front portions of the support guides 23 and 23 ', flap holding guides 24 and 24' for holding the folded flap from above are provided.

The back finger device 30 is connected to the transfer device 2
0. The back finger device 30 has a substantially L-shaped finger bar 32, 3
2, 32 ', 32' are set in pairs, and are attached to two places. When the shaft 31 rotates, the tip of the finger bar 32, 32 'pushes the rear glue flap 14, 14' of the material sheet 11 from the lower rear to the upper front, and the finger bar 32, 32 'moves along the horizontal folding line. The rear flap is arranged to bend upward and forward. The shaft 31 is connected to a servomotor (not shown),
The light sensor 33 provided above the rear part of the material sheet 1
It operates with a predetermined delay after detecting the arrival of 1.
This delay is provided in the transfer device of the box making machine, and generates a pulse corresponding to the transfer distance (not shown).
It is set by counting the pulses from In addition,
Detailed operation will be described later.

Air outlets 40, 40 'are provided at the upper portion of the transfer device 20, near both side edges.
These air outlets 40, 40 'are connected to an air pump (not shown) and intermittently blow air.
That is, similarly to the back finger device 30, after the optical sensor 33 detects the arrival of the material sheet 11, it operates with a predetermined delay, and the front positions 41, 41 'of the creases of the rear glue flaps 14, 14' are located. The air is blown out toward the upper surface to prevent the front part of the bending line from floating.

The auxiliary air blowing date devices 42, 42 '
The air outlets 40, 40 'are provided at positions in front of the air outlets, respectively. These auxiliary air outlet devices 42, 4
2 ′ is connected to an air pump (not shown) together with the air outlets 40, 40 ′, and the air outlets 40, 4
At the same time as 0 ′, air is blown toward the rear of the upper surface of the material sheet 11, and the air flows from the air blowout ports 40, 40 ′ to the front, and the folded front glue flaps 13, 13 ′.
Is prevented from being restored.

The rear flap bending apparatus 10 having the above-described structure operates as follows.

As shown in FIG. 3A, the material sheet 1 in which the front glue flaps 13, 13 'in the state of FIG.
1 is conveyed. At this time, the arrival of the material sheet 11 is detected by the optical sensor 33.

As shown in FIG. 3B, the rear glue flap 1
When the finger 4 and 14 ′ reach the finger fingers 32 and 32 ′ of the back finger device 30, that is, after counting a predetermined number of pulses of the pulse generator from the detection of the optical sensor 33, 32 'begins to rotate. At this time, air is blown out from the air blowout ports 40, 40 ', and the upper surfaces of the front positions 41, 41' of the bending lines of the rear glue flaps 14, 14 'are pressed to prevent floating.
For this reason, the rear glue flaps 14, 14 'are reliably bent. At the same time, the auxiliary air outlet devices 42, 4
Air is blown out from 2 ', and the front glue flaps 13 and 1
Press 3 'backward. If there is no blowout, the air from the air blowout ports 40, 40 'flows forward, and after being bent, the front glue flaps 13, 13', which are partially returned due to the habit of the sheet, are pushed forward, There is a possibility that it will enter the flap holding guides 24 and 24 'in the original flat state.

Thereafter, as shown in FIG. 3C, the bending proceeds. At this point, the air outlets 40, 4
0 ', the air blowing from the auxiliary air blowing devices 42, 42' is unnecessary, and is stopped. The time of the stop is also set by counting a predetermined number of pulses of the pulse generator.

As shown in FIG. 3D, the finger bar 32
Completely folds the rear glue flaps 14, 14 ', the material sheet 11 enters the flap holding guides 24, 24', and is sent out to the next step while being held in the folded state.

In the above embodiment, the auxiliary air outlet 4
The operations of 2, 42 'are performed simultaneously with the air outlets 40, 40'.
Depending on the nature or the like, the air outlets 40, 40 'may be shifted before and after the operation, or the operation may be omitted.

Further, the operation speed of the box making machine is increased, and the air outlets 40, 40 ', the auxiliary air outlets 42,
When the intermittent operation of 42 'becomes unstable, the operation may be continued.

In the above embodiment, the rear glue flaps 14, 1
Although used for the 4 ′ bend, it is also applicable to the case where the rear side flap 17 of FIG. 4E is bent forward. Of course, this device can be applied to the production of other boxes, bags, and the like.

[0027]

As described above, the rear flap bending apparatus of the present invention presses the front portion of the bending line by the air from the air outlet to prevent the floating from occurring. In addition, since the air outlet is separated upward, the passage of the bent flap and the back finger is not hindered. Therefore, it is not necessary to accurately determine the position of the air outlet, and the setup work when the shape, size, etc. of the product is changed becomes easy and can be performed quickly. In particular, the position adjustment in the front-rear direction is significantly facilitated because it is not necessary to actually move the position only by changing the time point of the operation. In addition, the adjustment of the pressing strength is very easy because it is only necessary to adjust the pressure of the blown air.
Further, since the pressing is performed in a non-contact manner, the material sheet is not damaged, the finished product is good, and no abrasion occurs, so that the durability of the apparatus is improved.

[Brief description of the drawings]

FIG. 1 is a side view of one embodiment of the present invention.

FIG. 2 is a plan view of the same example.

FIG. 3 is an explanatory diagram showing the operation of the same example.

FIG. 4 is a plan view showing a method of manufacturing a box manufactured by a box making machine using the same example.

[Explanation of symbols]

10: rear flap bending device, 11: material sheet, 1
3, 13 ': front glue flap, 14, 14': rear glue flap, 20: conveying device, 30: back finger device, 32, 32 ': finger bar, 40, 40': air outlet device, 41, 41 '... the front part of the bend,
42, 42 '... auxiliary air outlet device.

Claims (4)

(57) [Claims] 1. A conveying device for conveying a material sheet horizontally and forwardly, and a finger bar which rotates in synchronization with the material sheet, wherein a front end of the finger bar moves down a rear flap of the material sheet. A back finger device that pushes the rear flap upward and forward along the horizontal folding line by pushing upward from the rear, and blows air toward the upper surface of the front position of the bending line, and the front of the bending line rises Rear flap bending device in a box making machine or the like having an air blow-out port for preventing the occurrence of a flap. 2. The air outlet according to claim 1, wherein the air is blown toward the rear of the upper surface of the material sheet, and the air from the air blow flows forward and pushes another flap forward. Rear flap bending device in a box making machine or the like having an auxiliary air outlet for preventing the occurrence of the problem. 3. The rear flap bending device according to claim 1, wherein the air from the air outlet is intermittently blown out in synchronization with the conveyed material sheet. 4. The rear flap bending device according to claim 1, wherein air is continuously blown out from the air blowout port in a box making machine or the like.