JPH0544121Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a blank folding correction device, which is used in a box making machine in particular, to correct the bending deviation of a partially bent blank. The present invention relates to a bending misalignment correction device.

[Prior Art] Generally, when manufacturing a folding box made of paper, the box is manufactured by folding a blank that is the basis of the box.

In a box-making machine that automatically manufactures folding boxes, blanks are transported onto a folding line, and the blanks are folded and glued during this transport.

In a conventional blank conveying device used in such a box making machine, the conveying device for the folded portion includes a conveying belt that supports and conveys the bottom of the blank, and a straightening belt that supports the folded portion of the blank from above. and has.

The bent portion of the blank attempts to return to its pre-folding state due to its restoring force, but is blocked by the correction belt and remains folded.

Moreover, since this straightening belt moves at a variable speed in the conveying direction of the conveyor belt, by adjusting the speed of the straightening belt relative to the conveyor belt, the positional deviation between the folded part and the bottom of the blank can be corrected. can do.

[Problems to be solved by the invention] However, the blank bending misalignment correcting device in the conventional blank conveying device is not capable of sufficiently correcting the misalignment between the folded part and the bottom of the blank during conveyance. The problem is that it cannot be done.

In other words, the contact pressure between the straightening belt and the bent part of the blank is due to the friction generated between them due to the restoring force of the bent part, but the restoring force is relatively weak and the contact area is small. Since the contact pressure is also small, sufficient contact pressure cannot be obtained.

For this reason, sufficient correction is not performed, and the misalignment between the bent portion and the bottom portion is insufficiently corrected, resulting in an uneven product.

In particular, when the bent portion is long, a considerable positional shift occurs between the tip of the bent portion and the bottom of the blank.

Such positional misalignment impedes reliable bending, causes distortion in manufactured boxes, and adversely affects uniformity among products.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a blank bending misalignment correcting device that can perform a reliable bending process and produce box products of uniform quality.

[Means for Solving the Problems] The present invention includes a conveyor belt that supports the bottom of a partially bent blank and conveys it in a predetermined direction, and a conveyor belt that conveys the partially bent blank in a predetermined direction. A correction belt capable of moving at a variable speed in a predetermined direction while supporting the blank. It is something to do.

[Function] Since the correction belt in the blank bending misalignment correction device according to the present invention is formed with a frictional resistance surface due to unevenness, etc., the contact resistance with the bent portion of the blank increases, and the correction belt The bent portion of the blank can maintain reliable contact with the folded portion of the blank, and the positional deviation can be corrected reliably.

[Example] Hereinafter, an example of the blank bending misalignment correcting device according to the present invention will be described based on the drawings.

Fig. 1 is a partial perspective view of the orthodontic device, and Fig. 2 is a partial perspective view of the orthodontic device.
FIG. 2 is a cross-sectional view of the device shown in the figure, viewed from the direction of arrow X.

Here, the blank 1 has already been bent at two places, and creases are formed so that the bent parts 1a and 1b are folded onto the upper surface.

The bottom 1c of the blank 1 is connected to the conveyor belts 2a and 2b.
As the conveyor belts 2a and 2b move from the right to the left in FIG. 1, the blank 1 is also conveyed in the same direction.

The folded portions 1a and 1b try to open in the directions of arrows R1 and R2 in the figure, respectively, due to the restoring force of the fold, but stop when they come into contact with the correction belts 3a and 3b.

Therefore, the contact between the correction belts 3a, 3b and the bent portions 1a, 1b is based on this restoring force.

The installation position of the correction belts 3a, 3b can be adjusted freely.

Therefore, the horizontal position is adjusted according to the length of the folded part, and the vertical position is adjusted according to the folding relationship of the folded parts (the vertical relationship when multiple folded parts are folded together). can be adjusted.

In the example shown in the figure, the correction belts 3a and 3b are located at the tips of the longer bent portion 1a and the shorter bent portion 1b, respectively, and the shorter bent portion 1b is located below. The correction belts 3a and 3b are installed so as to do so.

The correction belts 3a, 3b are the conveyor belts 2a, 2b.
move in the same direction.

Moreover, the moving speed of each belt can be adjusted independently.

Therefore, by adjusting the moving speed of the correction belts 3a, 3b, the bent portions 1a, 1b and the bottom portion 1c can be
It is possible to correct positional deviations that occur during bending between the two.

For example, if the tip of the longer bent portion 1a in the figure is ahead in the conveyance direction, the speed of the correction belt 3a may be slightly slowed down; You just have to speed it up a little.

The features of the device according to this invention are that the correction belt 3
The point is that the surfaces of a and 3b are provided with frictional resistance surfaces such as unevenness.

FIG. 3 shows an example of a correction belt in which unevenness is provided as the frictional resistance surface.

In this example, grooves 4 are formed diagonally on the surface of the correction belt.

In addition, a large number of protrusions can be provided, and in short, any type of protrusion can be used as long as a friction resistance surface is formed by unevenness or the like on the surface.

Further, it is sufficient that the frictional resistance surface due to the unevenness or the like is formed at least on the blank contact surface (the lower surface of the correction belt in the figure).

By providing such unevenness, etc., the contact resistance between the correction belt and the bent portion of the blank increases, so that the position of the bent portion can be reliably corrected by adjusting the speed of the correction belt. You will be able to do this.

In particular, as shown in the figure, for blanks where the length of the folded portions differs on both sides, or for blanks with a large folded width, the position can be adjusted reliably, so the folded portions 1a and 1b can be folded together. It is possible to compensate for this so that there is no misalignment of the tip.

[Effect of the invention] As described above, according to the invention, in the blank bending misalignment correcting device, the correction belt is provided with a frictional resistance surface made of unevenness, etc., so as to increase the contact resistance with the bent portion of the blank. This makes it possible to sufficiently correct the misalignment between the folded part and the bottom, allowing for reliable folding and producing foldable box products of uniform quality. You will be able to do this.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of a blank bending misalignment correcting device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the device shown in FIG.
The figure shows an example of a correction belt used in the device according to the present invention. 1... Blank, 1a, 1b... Bent part, 1
c... Bottom, 2a, 2b... Conveyor belt, 3, 3
a, 3b...Correction belt, 4...Groove portion.

Claims (1)

[Claims for Utility Model Registration] (1) A conveyor belt that supports the bottom of a partially bent blank while conveying it in a predetermined direction, and a conveyor belt that supports the partially bent portion of the blank from above. and a correction belt movable at a variable speed in the predetermined direction, the blank bending misalignment correction apparatus is characterized in that a friction resistance surface is formed by unevenness or the like on at least the blank contact surface of the correction belt. Blank bending misalignment correction device. (2) The blank bending misalignment correction device according to claim 1, wherein a friction resistance surface is formed by forming a large number of grooves on the surface of the correction belt.