JP6614809B2 - Packaging device with film folding mechanism - Google Patents

Description

The present invention wraps an article to be packaged with a film, for example, a shrink film, and then cuts both ends of the tubular film enclosing the article to be wrapped with a margin for folding, and covers the margin for folding at both ends. The present invention relates to a packaging device provided with a folding mechanism for folding into the lower surface of a package.

FIG. 8 is a schematic view for explaining the film folding principle of the packaging apparatus provided with the film folding mechanism. In this packaging apparatus, an article to be packaged is placed on a carry-in conveyor (not shown), conveyed to the downstream take-up conveyor 6A side, and the object to be packaged 1 (for example, a side dish) sandwiched on the take-up conveyor 6A. The film is wrapped in a tube shape with a film such as polyethylene overlap shrink film, and the film between the packages 1 is cut with a film cutting machine 3, and the folding margin 4 at both ends of the tube film is folded. The mechanism 1 wraps the package 1 by folding it into the lower surface of the package 1.

The overlap mechanism for wrapping the object to be packaged with the film is such that the band-like film is covered from above on the object to be packaged 1 carried in by the take-up conveyor 6A, and then both side edges of the film are formed in the shape of a palm at the lower part of the object to be packaged. Wrap together to wrap the package in a tube. The article to be wrapped 1 wrapped in a tube-shaped film is conveyed downstream by a first side conveyor 6 disposed downstream of the take-up conveyor 6A, and is moved by a film cutter 3 in front of the film folding mechanism 5. The film between the packages 1 is cut.

The film folding mechanism 5 is disposed on the downstream side of the film cutting machine 3, an endless suede conveyor 7 is disposed at the lower part, and a suction chamber 8 for sucking the folding margin 4 of the tubular film is disposed inside the suede conveyor 7. ing. On both sides of the upper part of the suede conveyor 7, second side conveyors 9 for transporting the article 1 covered with the film are arranged.

FIG. 9 is an explanatory view showing a process of folding the upstream folding margin into the lower surface of the package. In FIG. 9A, the upstream folding margin 4 cut by a film cutting machine (not shown in FIG. 9) is sucked from the sliding opening 10 of the sliding conveyor 7 and the suction port 11 of the suction chamber 8.

As shown in FIG. 9B, since the speed of the sag conveyor 7 is higher than the speed at which the article 1 is conveyed by the side conveyor 9, the upstream side sucked into the sag opening 10 of the sag conveyor 10 The folding margin 4 is folded into the lower surface of the package 1 while being dragged by the rod 12 on the upstream side of the sliding opening 10 of the sliding conveyor. In FIG. 9C, the upstream folding allowance 4 of the film that wraps the package 1 is completely removed from the opening 10 and folded into the lower surface of the package 1.

Japanese Utility Model Publication No. 56-175403 JP-A-56-113508

As shown in FIG. 10 (A), when the speed of the folding conveyor 7 is increased in order to increase the packaging speed, the folding margin 4 is bent at an acute angle. 12 is caught and a load is applied to the folding allowance 4.

In Patent Document 1, the impact when the folding margin is caught on the upstream rod of the sudder opening is large, and the film is damaged. Therefore, the upstream and downstream rods of the suede opening are covered with rubber tubes, Even if an impact is applied to the rod, the rubber tube is used to provide cushioning and absorb the impact.

However, in Patent Document 1 and Patent Document 2, since the article to be packaged was stored in the tray, the tray was not crushed even if it was pulled by the rod of the opening of the sliding conveyor and loaded. When the soft package 1 such as bread is directly packaged with a film, as shown in FIG. 10B, the folding allowance 4 is strongly pulled, and the package 1 may be out of shape. For example, in the case of bread sandwiched with side dishes such as boiled eggs, vegetables, seafood, etc., if the above-mentioned side dishes protrude from the bread, the product value is lost.

In view of the above-described problems related to the conventional technology, the present invention provides a packaging device provided with a film folding mechanism, which has been proposed in order to suitably solve this problem, and does not impose a load on the folding margin. The purpose is to do.

In order to overcome the above-mentioned problems and achieve the intended purpose suitably, the packaging apparatus according to the present invention is conveyed by a carry-in conveyor for placing an article to be packed and carrying it to the downstream take-up conveyor side, and a take-up conveyor. An overlap mechanism that covers a film to be wrapped and wraps both side edges of the film in a palm-like manner to form a tubular film; a film cutting machine that cuts the tubular film between the wrapped objects; The film folding mechanism is disposed downstream of the film cutter and includes a film folding mechanism that folds the folding margin at both ends of the tubular film into the lower surface of the package in the folding section. Sudare conveyor is arranged a suction chamber for sucking the folding margin of the upstream side of the tubular film within said blind conveyor arrangement Is, at the top of the tire fabric conveyor, a side conveyor is arranged for transporting a package coated with a film, the moving speed of the conveying speed and the film of the packaged articles is a constant speed, the rotational speed of the tire fabric conveyor Change according to the position of the opening of the sliding opening, when the sliding opening moves through the folding section, the rotational speed of the sliding conveyor is low, and when the sliding opening moves outside the folding section, increase the speed, and finally Matches the movement time of one cycle of the cut size of the film with the movement time of one cycle of the opening of the sag, and in the folding section where the fold allowance is folded into the lower surface of the package , The speed ratio between the moving speed and the conveyance speed of the object to be packaged by the side conveyor is expressed by the following formula in relation to the folding section and the dimension of the folding allowance. 4) and 120% to 300% calculated by the packaging apparatus having a film folding mechanism, characterized in that. In the following formula (4), D [mm] is a folding section in which the folding margins at both ends are folded on the lower surface of the package, and Dt [mm] is the dimension of the folding margin.

The packaging apparatus provided with the film folding mechanism having the above configuration changes the rotation speed of the folding conveyor according to the position of the opening of the sliding opening, and when the sliding opening moves through the folding section, the rotation speed of the folding conveyor is When the slippery opening moves outside the folding section at low speed, the load is not applied to the upstream folding margin of the tubular film by increasing the speed.

In addition, the packaging apparatus provided with the film folding mechanism having the above-described configuration adjusts the speed ratio of the rotational speed of the conveyor and the conveyance speed of the packaged object according to the size of the folding allowance. Do not put a load on the folding margin upstream.

Due to the configuration of the film folding mechanism, a load is not applied to the folding margin at the end of the package, and the soft package is prevented from being deformed.

The front view of the packaging apparatus provided with the film folding mechanism of this invention The top view of the packaging apparatus provided with the film folding mechanism of this invention Schematic explanatory diagram of the film folding mechanism of the present invention Time chart of the film folding mechanism of the present invention Comparison of conventional film folding mechanism and this example Schematic explanatory diagram of a film folding mechanism of another embodiment of the present invention Schematic explanatory diagram of a film folding mechanism of another embodiment of the present invention Schematic explanatory diagram for explaining the principle of the film folding mechanism Schematic explanatory diagram for explaining the movement of the film folding mechanism Schematic explanatory diagram for explaining the problems of the conventional film folding mechanism

Next, an example is given about the packaging apparatus provided with the film folding mechanism based on this invention, and it demonstrates below, referring drawings. In addition, the code | symbol of the same drawing is used about the same structure as the film folding mechanism demonstrated by the said background art.

FIG. 1 is a front view of a packaging apparatus provided with a film folding mechanism according to the present invention, and FIG. 2 is a plan view of the packaging apparatus. The packaging apparatus includes a carry-in conveyor 2 for placing the objects to be packaged 1 at equal intervals and feeding them to the downstream take-up conveyor 6A side, and a chuck chain from above the objects to be packaged 1 conveyed by the take-up conveyor 6A. 21A covers the belt-shaped overlap shrink film 20 (in this embodiment, the shrink film will be described, but the present invention is not limited to the shrink film), and both side edges of the shrink film 20 are moved downward by the center roller 27. An overlap mechanism 21 that forms a tubular film using the shrink film adhesiveness, and a first side that conveys the tube-shaped package 1 disposed downstream of the take-up conveyor 6A. The tube 6 in which the conveyor 6 and the article to be wrapped 1 are wrapped is cut at a predetermined interval. The film cutter 3, the film folding mechanism 5 that folds the folding margin 4 at both ends of the cut tubular film into the lower surface of the package 1, and the folding margin 4 at both ends are folded by the film folding mechanism 5. The heater conveyor 22 that shrinks the film at the bottom while carrying out the article 1 to be packaged, the presser conveyor 25 that is disposed above the heater conveyor 22 and holds the article 1 to be packaged, and the shrink film that wraps the article 1 to be packaged And a shrink tunnel 26 for contraction. In this packaging device, the upstream side and the downstream side are selectively used in accordance with the moving direction of the strip film 20 and the package 1.

Next, operations and problems of the conventional folding mechanism will be described with reference to FIG. 3 is the same as the film folding mechanism shown in FIG. In one cycle of the folding conveyor 7 of the film folding mechanism 5, the opening 10 shown in FIG. 3 makes a round from the position of the upstream corner (upper left side in FIG. 3) of the upper portion of the folding conveyor 7 to the same position. Until it returns to. During this one cycle, the article to be packaged 1 wrapped in the film is sent downstream by one cycle. That is, while the slip conveyor 7 rotates for one cycle, the article 1 to be packaged conveyed to the first side conveyor 6 on the left side in FIG. 3 is cycled to the position of the article 1 on the right conveyor 7 on the right side. Sent in minutes. In addition, the 1st side conveyor 6 and the 2nd side conveyor 9 are rotating continuously at the same speed, and the to-be-packaged object 1 is continuously upstream at a constant speed by the 1st side conveyor 6 and the side conveyor 9. It is conveyed from the side to the downstream side. The sliding conveyor 7 also rotates continuously at the same speed.

In the conventional film folding mechanism 5, the speed difference [%] of the rotational speed of the sliding conveyor 7 with respect to the transport speed of the package 1 is expressed by the following formula 1.
The circumferential dimension [mm] of the staple conveyor means the length of the entire circumference of the endless staple conveyor 7, and the dimension is naturally constant. The cut size [mm] of the film that covers the package 1 refers to the total length including the total length of the package 1 and the folding margins 4 and 4 at both ends of the package 1. The cut size [mm] of the film varies depending on the dimension of the package 1 and the dimension of the folding allowance 4.

As the cut size [mm] of the film is shorter, the speed difference from the rotational speed of one cycle of the slip conveyor 7 becomes larger, and as shown in FIG. There is a problem that the impact at the time of folding is increased. On the contrary, if the cut size [mm] of the film is too large, there is a problem that the sag opening 10 of the sag conveyor 7 cannot fold the fold margin 4 into the bottom surface of the package 1 due to insufficient time. The difference between the speed difference and the present embodiment will be described later.

Example 1
The packaging apparatus provided with the conventional film folding mechanism includes one cycle of the slip conveyor 7 that rotates at a constant speed, and one cycle of the article 1 that moves at a constant speed (the rotation speed of the second side conveyor 9). However, in the first embodiment, the speed of the conveyance speed of the packaged object and the rotational speed of the sliding conveyor 7 are adjusted in accordance with the dimension of the folding allowance 4. The ratio [%] was adjusted.

FIG. 4 is a time chart of the film folding mechanism of the present invention. The symbols used in FIG. 4 are as follows.
D [mm]: Folding section where the folding allowance at both ends is folded on the lower surface of the packaged object PL [mm]; Film cut size Dt [mm]; Folding allowance dimension WL [mm]; Packaged dimension Dc [Mm]: Movement distance of the packaged object until the opening of the suede catches up with one end of the packaged object Dv [mm]: From the time when the opening of the suede catches up with one end of the packaged article until the folding margin is folded, Moving distance of packaged object Vw [mm / cycle]; Conveying speed of packaged object Vt [mm / cycle]; Moving speed of the opening of the sliding conveyor

The relationship between the dimension Dt [mm] of the folding allowance, the cut size PL [mm] of the film, and the dimension WL [mm] of the package is expressed by the following equation (2). The dimension Dt [mm] of the folding margin at both ends of the same is the same dimension.

In the conventional example, the rotational speed of the sag conveyor 7 is always constant, but in the first embodiment, the rotation speed of the sag conveyor 7 is changed according to the position where the sag opening 10 moves. That is, when the slipper opening 10 moves in the folding section D [mm], the rotational speed of the slip conveyor 7 is low, and when the slipper opening 10 moves outside the folding section D [mm], the speed is increased. Finally, the moving time of one cycle of the cut size PL [mm] of the film is made to coincide with the moving time of one cycle of the opening 10. In addition, the conveyance speed Vw [mm / cycle] of the article to be packaged and the moving speed of the film 20 are constant.
Next, the speed ratio [%] with respect to the article 1 to be packaged when the opening 10 passes through the folding section D [mm] will be described. A speed ratio [%] between the moving speed Vt of the opening 10 and the conveying speed Vw of the article 1 is expressed by the following equation (3).

The speed ratio [%] is expressed by the following equation (4) in relation to the folding section D [mm] and the folding allowance dimension Dt [mm].

Since the folding section D [mm] has a fixed dimension, it can be seen from the formula (4) that the speed ratio [%] is determined by the dimension Dt [mm] of the folding margin. Accordingly, the speed ratio [%] of the speed at which the opening 10 moves in the folding section D [mm] with respect to the conveyance speed Vw [mm / cycle] of the package 1 is the dimension Dt [mm] of the folding allowance. It may be determined by.

Next, a process for deriving formula (4) of the speed ratio [%] will be briefly described. As expressed by the mathematical formula (3), the speed ratio [%] can be expressed as follows.

Then, the moving speed Vt [mm / cycle] of the opening in the formula (3) is expressed as the following formula (5).

The right side of the mathematical formula (5) is obtained by adding the speed required for the sliding opening 10 to overtake the packaged object to the packaged conveyance speed Vw [mm / cycle]. Further, Dc [mm] in the mathematical formula (5) indicates a supplemental distance until the sliding opening 10 catches up with the rear end of the article 1 to be packaged. Since the time required for the opening to catch up with the package is the same as the time required for the package to move between Dc [mm], Dc [mm] can be expressed by the following equation (6). Can be represented.

The equation (6) becomes the following equation (7).

Substituting the equation (5) into the equation (7) yields the following equation (8).

By arranging the equation (8), Dc [mm] can be simplified to the following equation (9).

Substituting the equation (9) into the equation (5) representing the moving speed Vt [mm / cycle] of the opening of the conveyor, the following equation (10) is obtained.

Since the speed ratio [%] is expressed by the equation (3) as described above,
Speed ratio [%] = Vt [mm / cycle] / Vw [mm / cycle] * 100.
Substituting the formula (10) into the formula (3) yields the following formula (11).

By dividing Vw [mm / cycle] in Equation (11), Equation (4) representing the speed ratio [%] can be derived.

Next, what applied the actual dimension using the said Numerical formula (4) is demonstrated. FIG. 5 is a comparative view of the conventional example of the film folding mechanism and the first embodiment. The circumferential dimension [mm] of the conveyor is 1143 [mm], the folding section D [mm] is 300 [mm], and the folding margin 4 is set to 50, 75, and 100 [mm]. The speed ratio [%] of the conventional film folding mechanism is calculated by Equation 1.

Substituting the above numbers into Formula (1) of the conventional example, as shown in FIG. 5, when the cut size PL [mm] of the film is short, the conventional speed ratio [%] is 571 [%], 457 [%]. , 381 [%]... And the speed difference becomes too large, and the folding margin 4 is loaded. On the other hand, in the first embodiment, when the numerical value is substituted into the mathematical formula (4), 150 [%] is obtained when the dimension of the folding allowance 4 is 50 [mm], and 200 [%] when the dimension is 75 [mm]. %] And 100 [mm] are 300 [%]. Since the folding section D [mm] is fixed as shown in the mathematical formula (4), the speed ratio [%] is determined by the dimension Dt [mm] of the folding allowance.

As described above, the speed ratio [%] of the conveyance speed Vw [mm / cycle] of the package to the moving speed Vt [mm / cycle] of the opening 10 is 150 [%] to 300 [%] as described above. ], The rotation speed of the sliding conveyor 7 and the conveyance speed of the first and second side conveyors 6 and 9 are adjusted between 120 [%] and 300 [%], and the folding section What is necessary is just to set the optimal ratio of speed ratio [%] of the moving speed Vt of the opening 10 in D [mm], and the conveyance speed Vw of the to-be-packaged object 1. FIG. If it is less than 120 [%], the moving speed Vt [mm / cycle] of the opening 10 becomes slow and the dimension of the folding allowance 4 becomes too short, making it difficult to fulfill its role. When 120%, the size of the folding allowance 4 is 25 [mm]. On the other hand, if it is 300 [%] or more, the moving speed Vt [mm / cycle] of the opening 10 is too fast, and a load is applied to the folding allowance 4. Most preferably, the speed ratio [%] is set between 150 [%] and 250 [%].

By allowing the speed ratio [%] to be set according to the dimension [mm] of the folding allowance 4 as described above, the load applied to the allowance allowance 4 is reduced, It can be packaged without deformation.

(Example 2)
In the first embodiment, the speed ratio [%] of the rotation speed of the conveyor 7 in the folding section D [mm] and the conveyance speed of the package 1 is controlled to an optimum ratio according to the size of the folding allowance 4. However, in the second embodiment, as shown in FIG. 6, the suction port 11 of the suction chamber 8 is widened and slid according to the length of the folding allowance 4 so as not to be caught by the top plate 23 of the suction chamber 8. It can be changed with a shutter (not shown). Thus, by changing the length of the suction port 11 according to the length of the folding allowance 4, it is possible to prevent the folding allowance 4 from being folded at an acute angle and to prevent the folding allowance 4 from being loaded. Note that the suction port 11 may be configured to reciprocate a shutter that closes the suction port 11 following the movement of the opening 10.

(Example 3)
FIG. 7 shows an explanatory diagram of the third embodiment. In the third embodiment, a rotating roller 24 is provided at the edge portion of the top plate 23 of the suction port 11 of the suction chamber 8. By providing the rotation roller 24, the rotation roller 24 is rotated even when the folding allowance 4 is caught on the edge portion of the top plate 23, so that no load is applied to the folding allowance 4. Moreover, you may comprise so that the rod 12 (refer FIG. 10) of the upstream of the slip conveyor 7 may rotate.

In order to wrap a packaged object, the present invention covers the packaged article while feeding the strip-shaped film along the longitudinal direction, continuously forms a tube, and cuts to leave a folding margin. It is useful for a packaging apparatus provided with a film folding mechanism that folds the folding allowance to the lower surface of the package.

DESCRIPTION OF SYMBOLS 1 Package 2 Carry-in conveyor 3 Film cutting 4 Folding allowance 5 Film folding mechanism 6 1st side conveyor 7 Sudden conveyor 8 Suction chamber 9 2nd side conveyor 10 Sudder opening part 11 Suction port 12 Rod 20 Film 21 Tube making mechanism 22 Unloading Conveyor 23 Top plate 24 Rotating roller

Claims (4)

A carrying conveyor for placing the article to be packaged and carrying it to the downstream take-up conveyor side, and covering the article to be packaged conveyed by the take-up conveyor with the film on both sides of the film in the shape of a palm at the bottom. overlap mechanism that Jo film, a film cutter for cutting the tubular film between the articles to be packaged, is arranged downstream of the film cutter, the packaged in folding section the folding margin at both ends of tubular film In a packaging device provided with a film folding mechanism for folding into the lower surface of an object,
In the film folding mechanism, an endless sudder conveyor is arranged at the bottom, and a suction chamber for sucking the folding margin on the upstream side of the tubular film is arranged inside the sudder conveyor,
A side conveyor for conveying an article to be packaged covered with a film is disposed on the upper part of the conveyor.
The transport speed of the package and the moving speed of the film are constant, and the rotational speed of the slipper conveyor is changed according to the position of the slipper opening, and when the slippery opening moves in the folding section, The rotation speed is low, and when the opening is moved outside the folding section, the speed is increased. Finally, the movement time of one cycle of the cut size of the film is matched with the movement time of one cycle of the opening of the opening. ,
In the folding section where the folding allowance is folded into the lower surface of the package, the speed ratio between the moving speed of the sliding opening of the staple conveyor and the conveyance speed of the package by the side conveyor is the dimension of the folding section and the folding allowance. Thus, a packaging device provided with a film folding mechanism, which is calculated by the following formula (4) to be 120% to 300%.
In the following formula (4), D [mm] is a folding section in which the folding margins at both ends are folded on the lower surface of the package, and Dt [mm] is the dimension of the folding margin.
The speed ratio of the moving speed of the opening of the sliding conveyor and the conveying speed of the package by the side conveyor is 150% to 300% or 150% to 250%. Packaging device equipped with a film folding mechanism. The dimension of the suction port of the suction chamber can be changed according to the length of the folding allowance so that the folding allowance on the upstream side of the tubular film is not caught on the top plate of the suction chamber . A packaging device with a film folding mechanism. The packaging apparatus provided with the film folding mechanism according to claim 1 , wherein a rotation roller is provided at an edge portion of the top plate of the suction port of the suction chamber or a rotating rod is provided at an opening portion of the sliding conveyor.