JPH0688579B2 - Carton expansion device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a carton expanding device that expands a flatly folded carton into a predetermined rectangular tube shape and supplies it to the next step.

[Conventional technology]

An example of the carton expanding device is one having a structure shown in FIG. This expansion device 50 is a pair of guide plates
51, 52, and the supplied carton W are adsorbed, and the guide plate 5
Adsorption means 53 for guiding between 1, 52. The spacing between the guide plates is set to a width suitable for expanding the carton W, and the inlet side is formed with tapered expanding portions 51a and 52a so as to receive the folded carton W and sequentially press both sides.

The flat carton W supplied by this is sucked by the suction means 53, drawn between the guide plates 51, 52, and expanded and formed into a rectangular tubular carton Wa by both guide plates.

[Problems to be Solved by the Invention]

The carton W does not always expand when being sandwiched by the guide plates 51 and 52, and it often remains flat as shown in FIG. 7 and FIG.

The present invention has been made in view of the above points, and an object of the present invention is to reliably expand the opening.

[Means for Solving the Problems]

In order to achieve the above-mentioned eyes, the present invention has a pair of guide plates that are provided at both ends and that guides a flatly folded cylindrical carton, a suction means that sucks the carton, and a position on the inlet side of the guide plate. And a lock bar disposed on one side of the lock bar for locking the one side flap, and a pressure gas ejection hole for blowing pressure gas into the carton provided on the side of the lock bar. The gist of the invention is to adsorb the carton by means of and to draw it between the guide plates, and to engage and open the flap by means of a retaining bar so that the pressurized gas is blown into the inside of the carton cylinder.

[Work]

When the carton is drawn between the guide plates by the suction means, the central flap on one side abuts the locking bar and bends upward. As a result, the pressure gas can be blown from the pressure gas ejection hole provided on the side of the locking bar and having the opening formed therein, and the pressure gas blown in expands to perform preliminary expansion. Therefore, the expansion with the next guide plate can be surely performed.

〔Example〕

1 to 4 relate to a first embodiment of the present invention. As shown in FIG. 9, the carton W is provided with a central tubular portion a having a square tubular portion a on both sides and central flaps b and c and four side flaps d.
A large number of flatly-folded cartons W are loaded in the hopper H, and are unwound one by one from below by an appropriate take-out means. However, since this take-out means has a well-known structure and is not directly related to the present invention, its explanation is omitted.

The expansion device 1 for the flat carton W includes a pair of guide plates 2 and 3, a suction means 4 that moves downward while suctioning the carton W, and a locking bar 5 that locks a central flap b on one side. In addition, a pressure gas ejection hole 6 is provided. Guide plate 2,3
Is the same as the above-described well-known structure, and the guide portions 2a and 3a are arranged opposite to each other with a narrow space suitable for expanding the cylindrical portion a, and the upper ends thereof are expanded to be convenient for receiving the flat carton W. And

The locking bar 5 is provided on the side portions of the guide portions 2a and 3a of the guide plates 2 and 3,
The guide plate is arranged close to the center flap b so that the center flap b is in contact with the guide plate at a right angle. In this embodiment, the locking bar 5 is a hollow tube, one end of which is connected to the pressurized gas supply device 7, and the gas ejection hole 6 is a carton W guided by the guide plates 2 and 3.
An example in which a plurality of holes are perforated is shown.

Next, description will be given based on the operation explanatory view of FIG. First, the carton W fed from the hopper H is sucked by the suction means 4 and drawn between the guide plates 2 and 3 in a horizontal state. At this time, one of the central flaps b abuts on the locking bar 5 and is further retracted by the suction means 4, so that the central flap b of FIG.
As shown in the drawing, the central flap b is curved, and an opening f is formed between the central flap b and the side flap d facing it. High-pressure gas is ejected from the ejection holes 6, and a part of the high-pressure gas is blown into the cylindrical portion a through the opening f to widen the opening f. As a result, the entire end of the tubular portion is opened, and pressure gas is blown into the tubular portion to expand the flat tubular portion. That is, preliminary expansion is performed, and then the space is supplied between the guide plates 2 and 3, so that each floor can be reliably performed.

Next, FIG. 5 shows a second embodiment. In the previous example, the locking bar 5 is a hollow tube, and the ejection hole 6 is bored in the hollow tube. However, the expansion device 10 of this embodiment separates both of them, and has an appropriate sectional shape. A pressure gas supply pipe 12 is arranged below the stop bar 11, and a pressure gas ejection hole 13 is bored in the pressure gas supply pipe 12 in the same manner as described above.

The procedure for attaching the locking bar 11 and the pressure gas supply pipe 12 is based on the previous example, and the same parts are designated by the same reference numerals and the description thereof will be omitted.

〔The invention's effect〕

According to the present invention, a locking bar is provided on the inlet side of the pair of guide plates, abuts on the flap of the carton that is pulled in by the suction means, and is subsequently retracted to form an opening by bending the flap, On this locking bar side,
That is, since the pressure gas is blown from the locking bar itself or the ejection holes provided below the locking bar, it is easy to blow the pressure gas, and the flat carton is expanded and pre-expanded. This has the effect of reliably expanding the next guide plate.

[Brief description of drawings]

1 to 4 relate to the first embodiment, FIG. 1 is an overall perspective view, FIG. 2 is an explanatory view of operation, and FIG. 3 is I in FIG.
-I is a cross-sectional view taken along the line I, FIG. 4 is a perspective explanatory view showing how the center flap is curved, and FIG. 5 is a perspective view showing a second embodiment.
FIG. 6 is a perspective explanatory view of a conventional example, FIG. 7 is a perspective view showing defective expansion of a carton, FIG. 8 is a sectional view taken along line II-II in FIG. 7, and FIG. 9 is an expansion of the carton. It is a perspective view showing a state. 1 and 10 are expansion devices, 2 and 3 are guide plates, 4 is suction means, and 5 and 11
Is a locking bar, 6 and 13 are pressure gas ejection holes, W is a carton, b,
c and d are flaps.

Claims (1)

[Claims] 1. A pair of guide plates having flaps at both ends for guiding a flatly folded cylindrical carton, an adsorbing means for adsorbing the carton, and one of the guide plates located on the inlet side of the guide plate. Provided with a locking bar to be locked on one side of the flap, and a pressure gas blowout hole for blowing pressure gas into the carton provided on the locking bar side, and sucks the carton by suction means, A carton expanding device, characterized in that the flap is locked and opened by a locking bar while being drawn between the guide plates, and pressure gas is blown into the inside of the carton cylinder.