JPH01213121A - Carton blank opening apparatus - Google Patents

Abstract

PURPOSE:To permit the accurate formation of a carton, by providing a holding bar and a pressure gas outlet on one side of the entrance of guide plates and delivering a pressure gas into the tubular interior of a carton blank through its opening formed by engagement of a flap with the holding bar. CONSTITUTION:A blank opening device 1 consists of a pair of guide plates 2 and 3, a suction means for sucking a carton blank W to effect its downward movement, a holding bar 5 for engaging with one side of a central flap b and a pressure gas outlet 6. The carton blank W is sucked by the suction means 4 and pulled down thereby in a horizontal position between the guide plates 2 and 3. During this time, the one side of the central flap b is bent by the suction means 4 by engagement with the holding bar 5 so as to form an opening f between itself and the facing side flap d. The pressure gas is delivered from the gas outlet 6 for preliminary opening of the carton blank, thereby ensuring the full opening thereof between the guide plates 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a carton expanding device that expands a flattened carton into a predetermined rectangular tube shape and supplies it to the next process.

[Conventional technology]

As the above-mentioned carton expanding device, there is one having a structure shown in FIG. 6, for example. This expanding device 50 includes a pair of guide plates 51 and 52, and a suction means 53 that attracts a supplied carton W and guides it between the guide plates 51 and 52. The interval between the guide plates is set to a width suitable for expanding the carton W, and the artificial side forms tapered expansion parts 51a and 52a so as to receive the folded carton W and sequentially press both sides.

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

[Problem to be solved by the invention]

When the carton W is held by the guide plates 51 and 52, it does not necessarily expand, and often remains flat and recessed, as shown in FIGS. 7 and 8, and may not be opened.

In view of this point, the present invention aims to ensure expansion.

[Means to solve the problem]

In order to achieve the above object, the present invention comprises a pair of guide plates that are provided with flaps at both ends and guide a flattened cylindrical carton, a suction means that suctions the carton, and a suction means located on the inlet side of the guide plate. The carton is provided with a locking bar and a pressurized gas ejection hole which are arranged on the opposite side of the carton and which lock the flap on one side. The purpose is to stop and open the carton to blow pressurized gas into the inside of the carton cylinder.

[Effect]

When the carton is drawn between the guide plates by the suction means, one central flap contacts the locking bar and curves upward. As a result, an opening is formed, which enables the injection of pressure gas, and is inflated by the blown pressure gas to perform preliminary expansion. Therefore, the next expansion using the guide plate can be performed reliably.

[Embodiment] FIGS. 1 to 4 relate to a first embodiment of the present invention. The carton W includes central flaps b, c and four side flaps d on both sides of a rectangular cylindrical portion a. A large number of flattened cartons W are loaded in a hopper H, and are fed out one by one from below by an appropriate take-out means. However, this ejecting means has a well-known structure and is not directly related to the present invention, so a description thereof will be omitted.

The expanding device 1 for this flat carton W includes a pair of guide plates 2 and 3, a suction means 4 that moves downward while sucking the carton W, and a locking bar 5 that locks the central flap b of the example. It is also provided with a pressure gas ejection hole 6. Guide plate 2
．． Reference numeral 3 denotes a guide portion 2a which has the same structure as the above-mentioned well-known structure, and which faces each other with a narrow interval suitable for expanding the cylindrical portion a, and whose upper end is expanded to suitably receive the flat carton W.

3a.

The locking bar 5 is the guide portion 2a of the guide plate 2.3.

The central flap b is disposed close to the guide plate so as to be in contact with the side of the guide plate 3a orthogonally thereto. 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 holes 6 are formed in plural holes toward the carton W guided by the guide plates 2 and 3. Here is an example.

Next, a description will be given based on the action explanatory diagram of FIG. 2.

First, the carton W fed out from the hopper H is attracted by the suction means 4 and drawn between the guide plates 2.degree.3 while keeping it in a horizontal state. At this time, one of the central flaps b comes into contact with the locking bar 5, and as it is further pulled in by the suction means 4, the central flap b curves as shown in FIGS. 3 and 4, and the opposite side flap d An opening f is formed between them.

High-pressure gas is ejected from the ejection hole 6, and a portion of the 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 cylindrical portion is opened, and pressurized gas is further blown in to expand the flat cylindrical portion. That is, preliminary expansion is performed, and then the expansion can be reliably performed by being supplied between the guide plates 2 and 3.

Next, FIG. 5 shows a second embodiment. The previous example shows an example in which the locking bar 5 is a hollow tube and the ejection hole 6 is perforated therein, but the expansion device 10 of this embodiment has both of these separately, and the locking bar 5 has an appropriate cross-sectional shape. A pressure gas supply pipe 12 is provided at the bottom of the pipe 11, and a pressure gas ejection hole 13 is bored therein in the same manner as described above.

The procedure for attaching the locking bar 11 and the pressure gas supply pipe 12 is similar to that of the previous example, and the same parts are given the same reference numerals and the explanation thereof will be omitted.

〔Effect of the invention〕

According to the present invention, a locking bar is provided on the inlet side of the pair of guide plates, and the locking bar is brought into contact with the flap of the carton that is pulled in by the suction means, and when the flap is continuously pulled in, the flap is curved to form an opening. Since pressurized gas is blown into the flat carton, the flat carton is expanded and pre-expanded, so that the next expansion using the guide plate can be ensured.

[Brief explanation of the drawing]

1 to 4 relate to the first embodiment; FIG. 1 is an overall perspective view, FIG. 2 is an action explanatory diagram, and FIG. 3 is an I in FIG.
- A cross-sectional view along the I heave, FIG. 4 is a perspective explanatory view showing how the central flap is curved, and FIG. 5 is a perspective view showing the second embodiment.
FIG. 6 is a perspective view of the conventional example, and FIG. 7 is a perspective view showing poor expansion of the carton.
FIG. 8 is a sectional view taken along the line II-II in FIG. 7,
FIG. 9 is a perspective view showing the expanded state of the carton. 1.10 is an expansion device, 2.3 is a guide plate, 4 is an adsorption means, 5, 11 is a locking bar, 6, 13 is a pressure gas ejection hole, W
is a carton, and b, c, and d are flaps.

Claims (1)

[Claims] A pair of guide plates provided with flaps at both ends to guide a flattened cylindrical carton, a suction means for adsorbing the carton, and a suction means located on the entrance side of the guide plate and provided on one side thereof It is equipped with a locking bar that locks on the flap on one side and a pressure gas injection hole, and the carton is attracted by a suction means and drawn between the guide plates, and the flap is locked and opened by the locking bar, and the pressure gas is released into the carton. A carton expansion device that blows air into the inside of a cylinder.