JPH0451412B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention is applicable to sheets in open cases such as inserting resin bag-like sheets into open cases such as cardboard boxes, paper boxes, and wooden boxes. Relating to an insertion device.

(b) Conventional technology Conventionally, for example, when storing mechanical parts such as bolts and nuts in a cardboard box, a rust preventive oil such as oil or grease is applied to the bolts and nuts to prevent them from rusting. Apply a small amount to the nut surface.

In order to prevent the cardboard box from softening due to oil and grease from such bolts and nuts, it is necessary to insert a sheet made of synthetic resin such as polyethylene or vinyl chloride into the cardboard box.

Also, when storing powder such as powdered soap in the cardboard box mentioned above, a synthetic resin sheet is inserted into the box in the same way as above to prevent such powder from spilling out of the box. There is a need.

In view of this need, sheet insertion devices described in, for example, Japanese Patent Laid-Open No. 55-9844 and Japanese Patent Laid-Open No. 55-55848 have already been invented.

The former device described in Japanese Patent Application Laid-open No. 55-9844 is
This is a device that uses the vertical movement of the sheet insertion frame to insert a bag-like sheet into a cardboard box from the top to the bottom. Therefore, the overall height of the device becomes high, requiring a huge amount of space for installing the device in the height direction, and the cost of the device increases.

In addition, the latter device described in Japanese Patent Application Laid-Open No. 55-55848 inserts a bag-like sheet into a cardboard box and then sucks and eliminates the air inside the box using an air intake device installed at the bottom of the cardboard box. This is a device for bringing the above-mentioned bag-shaped sheet into close contact with the inner surface of the box, but this conventional device has a problem in that the loss of intake air is extremely large because it uses negative pressure suction means.

(C) Purpose of the Invention This invention utilizes a unique positive pressure contact means using air blowing to efficiently act on the air inside the bag-shaped sheet in a direction in which the sheet comes into close contact with the inner wall surface of the open case, thereby minimizing air loss. In addition, it is possible to make the device smaller and more compact, and the amount of folding the bag-shaped sheet from inside the open case to the outside of the case can be regulated to the minimum required amount, eliminating sheet waste. An object of the present invention is to provide a sheet insertion device into an open case, which can reduce the driving load of a vacuum suction device used to suck and hold the sheet until the bag-like sheet is completely inserted into the open case. .

(D) Structure of the Invention The present invention includes a sheet winding section for winding a long bag-like sheet, a sheet conveying means for conveying the sheet in the sheet winding section to the opening side of an open case, and a A welding and cutting means is located at a predetermined distance forward from the open end of the case, and heat-seals the bag-like sheet from the sheet conveying means, and also cuts the bag-like sheet in front of the heat-sealed part, and a welding cutting means holds the leading end of the bag-like sheet open. an opening means for inserting the open end of the open case to a position corresponding to the opening means inside the open end of the bag-like sheet; and a non-retaining portion of the bag-like sheet after the open end of the open case is inserted into the inside of the front end of the sheet. and air blowing means for tightly contacting the inside of the open case with air blowing pressure, and the opening means includes a pair of vacuum members, and the inside of the pair of vacuum members is divided into a plurality of sections corresponding to the insertion direction of the open case. Chinyamba and
It includes a sheet suction hole communicating with each chamber, and sets the insertion position of the open case by the case insertion means to a position corresponding to one chamber on the side opposite to the welding and cutting means, and also allows air to flow into the open case of the bag-like sheet. Negative pressure suction is applied to all the chambers from the time the blowing starts until the sheet is almost inserted, and negative pressure is applied only to the chamber at the position corresponding to the case from the time the sheet is almost inserted until the insertion is completed. The present invention is characterized in that it is a sheet insertion device into an open case that is equipped with a vacuum suction device that applies force.

(E) Effects of the Invention According to the present invention, the bag-like sheet conveyed to the opening side of the open case by the sheet conveyance means is heat-sealed by the welding and cutting means located on the front side of the open end of the open case. , and after cutting the front side of the heat-sealed part, the leading edge of the sheet is held open by the opening means located at the leading edge of the bag-shaped sheet, and then an opening case is inserted inside the opened leading edge of the sheet, and after inserting this case, the sheet is opened. With the tip held open, the free portion of the bag-like sheet as the non-retained portion can be brought into close contact with the inside of the open case by air blowing pressure (positive pressure) from the air blowing means described above.

As a result, unlike devices using conventional negative pressure suction means, the positive air pressure from the air blowing means described above acts efficiently in the direction of bringing the bag-like sheet into close contact with the inner wall surface of the open case, so air loss is extremely small. There is a certain effect.

In addition, since the bag-shaped sheet is tightly attached to the inside of the case by blowing air as described above, there is no need for a sheet insertion frame that moves up and down inside and outside of the open case as in the conventional case, which makes the device smaller and more compact. This has the effect of making it possible to achieve this goal.

Moreover, since the insertion position of the open case by the case insertion means is set at the side opposite to the welding and cutting means, in other words, at the position corresponding to one chamber on the case insertion means side, when the insertion of the bag-like sheet is completed, this bag The amount of folding of the shaped sheet from the inside of the open case to the outside of the case is regulated to the minimum necessary predetermined amount corresponding to the length of one chamber, which has the effect of eliminating wasted sheets.

Furthermore, the above-mentioned vacuum suction device applies negative pressure suction force in two stages: from the time when air blowing starts until the sheet is almost inserted, and from the time when the sheet is almost inserted until the time when insertion is completed. This makes it possible to reduce the driving load of the vacuum suction device.

(F) Embodiment of the Invention An embodiment of the invention will be described in detail below based on the drawings.

The drawing shows an automatic sheet insertion device, and in FIG. 1, this automatic sheet insertion device includes a raw fabric roll 2 in which a completely continuous bag-shaped long sheet A without perforations is wound around a core 1; Opposite rollers 3, 3 transport the bag-like sheet A of the original fabric roll 2 to the opening side of the cardboard box B serving as an open case, and the rollers 3, 3 transport the bag-like sheet A of the original fabric roll 2 to the opening side of the cardboard box B serving as an open case, and the rollers 3, 3 that transport the bag-like sheet A of the original fabric roll 2 to the opening side of the cardboard box B serving as an opening case, and A welding cutting section 4 located on the left side heat-seals the bag-like sheet A conveyed by the above-mentioned opposing rollers 3, 3, and cuts the bag-like sheet A before the heat sealing; an opening 5 for holding the tip of A by suction; and a bag-like sheet A opened by this opening 5.
An insertion plate 6 into which the open end of the cardboard box B is inserted up to a position corresponding to the opening 5 inside the tip of the cardboard box (see FIG. 3); Air nozzles 7, 7 are provided for bringing the non-retained part, that is, the free part, into close contact with the inner surface of the cardboard box B by blowing air and positive pressure.

Note that a polyethylene sheet or a vinyl chloride sheet can be used as the above-mentioned bag-like sheet A.

Here, the above-mentioned welding and cutting section 4 has a fixed unit 9 located below the conveyance line 8 of the sheet A, and a movable unit 10 that moves up and down on the above-mentioned conveyance line 8 to approach and separate from the fixed unit 9. A piston rod 12 of a first cylinder 11 is connected to this movable unit 10.

The fixing unit 9 described above has a flat seal plate 14 and a clamp plate 15 for holding the sheet attached to the sheet-opposing surface of the heat insulating holder 13, and the seal plate 1
A recess 16 is formed between the clamp plate 15 and the clamp plate 15.

In addition, in the above-mentioned movable unit 10, a flat seal plate 18 and a clamp plate 19 for holding the seal are attached to the sheet facing surface of the heat insulating holder 17, and a plate for cutting the sheet A is attached between the seal plate 17 and the clamp plate 19. The hot wire 20 is arranged in a protruding manner.

Then, in the state shown in FIG. 1, electricity is applied to each of the seal plates 14, 18 and the heating wire 20 to heat each of these elements 14, 18, 20, and the movable unit 10 is moved by driving the first cylinder 11. is placed opposite to the fixing unit 9 as shown in FIG. 2, the bag-shaped sheet A is melted and cut by the hot wire 20, and
Each of the above-mentioned seal plates 14, 1 at the rear of the hot wire 20
8, the bag-like sheet A is heat-welded, and the bag-like sheet A in front of the cut portion is attached to the opposing clamp plate 15,
It is held at 19.

By the way, the above-mentioned opening 5 has a fixed suction section 21 located on the lower surface of the conveyance line 8 for the sheet A as shown in FIG. part 22,
A piston rod 24 of a second cylinder 23 is connected to the movable suction part 22.

The fixed suction section 21 described above has chambers 26 and 27 that divide the interior of the vacuum member 25 into a plurality of sections corresponding to the insertion direction of the cardboard box B.
Sheet suction holes 28 and 2 are provided on the facing surfaces of sheets 6 and 27.
A vacuum suction device (not shown) is connected to the pipes 30 and 31 that communicate with the chambers 26 and 27 separately via a communication pipe or a flexible tube.

Similarly, the movable suction section 22 described above also has a vacuum member 32.
It has chambers 33 and 34 whose insides are divided into a plurality of sections corresponding to the insertion direction of the cardboard box B, and sheet suction holes 3 are formed in the sheet-opposing surfaces of each of these chambers 33 and 34.
5 and 36, respectively, and a pipe 37, which communicates with each of the above-mentioned chambers 33 and 34, respectively.
A vacuum suction device (not shown) is connected to 38, for example, via a flexible tube.

Then, from the state shown in FIG.
3, and by protruding the piston rod 24 of the second cylinder 23, the upper movable suction part 22 is arranged opposite to the lower fixed suction part 21 as shown in FIG. , 33, 34 by applying the suction force of a vacuum suction device (not shown),
In this state, when the piston rod 24 is moved back to its original position as shown in FIG.
The bag ends are separated with one side being suctioned and held in the sheet suction holes 28 and 29 and the other in the sheet suction holes 35 and 36, respectively. The opening is processed as follows.

A transport line 8 for the sheet A is connected between the opening 5 configured in this manner and the welding/cutting section 4 described above.
A guide plate 39 for holding the sheet A is provided on the lower surface.

On the other hand, the aforementioned insertion plate 6 is an L-shaped plate, and on the back side of this insertion plate 6, the cardboard box B on the insertion plate 6 can be moved from the standby position α shown in FIGS. A driving rod 40 for inserting the sheet is connected to the sheet insertion position β shown in FIG. 34 compatible position.

Further, the aforementioned air nozzles 7, 7 are connected to an air compression source such as an air compressor.

The above-mentioned cardboard box B has both inner and outer flaps erected so that the top of the box is open, and the bag-like sheet A is inserted into the cardboard box B which is open at the top.

The illustrated embodiment is configured as described above,
The action will be explained below.

First, as shown in FIG.
is driven to transport the bag-like sheet A on the raw roll 2 side in the direction of arrow a in the figure, and when the leading end of the bag-like sheet A reaches the fixed suction part 21 close to the cardboard box B, the The driving of the setting rollers 3, 3 is stopped.

Next, as shown in FIG.
The piston rods 12 and 24 of the cylinders 11 and 23 are moved forward and forward, and the movable unit 1
0 to the fixed unit 9, and the movable suction part 22 to the fixed suction part 21, respectively.

When the above-mentioned movable unit 10 is placed opposite to the fixed unit 9, the bag-shaped sheet A is held between the upper and lower clamp plates 15 and 19, and the rear part of this holding part (right side in FIG. 2) is melted and cut by the hot wire 20. Along with being
The rear part of the cut portion is thermally welded, so-called heat sealed, by the upper and lower seal plates 14 and 18.

After the above-mentioned cutting and heat sealing, the power to the hot wire 20 and the seal plates 14, 18 is cut off, and each chamber 26, 27, 33, 34 is set to negative pressure via the pipes 30, 31, 37, 38. Then, the tip of the bag-like sheet A is attached to the suction holes 28, 29, 3.
Vacuum member 2 due to negative pressure suction from 5 and 36
5, 32 is adsorbed and held.

When the piston rod 24 of the second cylinder 23 is moved back in the direction of the arrow b as shown in FIG. 3 while maintaining such suction and holding, the leading end of the bag-shaped sheet A is opened as shown in the same figure. .

Note that at this point, the first cylinder 1 described above
The piston rod 12 of the first cylinder 11 may be moved back, and the movement of the piston rod 12 of the first cylinder 11 may be performed immediately before or immediately before the start of air blowing from the air nozzles 7, 7, which will be described later.

Next, as shown in FIG. 4, a cardboard box B is inserted into the tip of the bag-shaped sheet A which has already been opened.

That is, the aforementioned driving rod 40 is pressed in the direction of arrow c to move the cardboard box B from the standby position α to the sheet insertion position β, and the open end of the cardboard box B is inserted into one sheet suction hole on the side opposite to the welding and cutting means. 29,
Set it to the position corresponding to 36.

Next, as shown in FIG. 5, while maintaining the suction and holding of the sheet A by the suction units 21 and 22, an air compression source (not shown) such as an air compressor is driven to remove air from the air nozzles 7 and 7. When positive pressure air is blown, the free portion of the bag-like sheet A is displaced into the cardboard box B.

At the point in FIG. 5 when this bag-like sheet A is almost inserted into the cardboard box B, the chamber 2 on one side
While blocking the negative pressure suction effect on 6, 33,
By continuing the negative pressure suction action on the chambers 27 and 34 on the other side and further blowing air from the air nozzles 7 and 7, the bag-like sheet A described above is shaped into a cardboard box as shown in FIG. 6 due to the air blowing pressure. B
adheres to the inner surface of the

After the bag-like sheet A is completely in contact with the inner surface of the cardboard box B, the air blowing from the air nozzles 7 and 7 is stopped, and then a negative pressure suction action is applied to one of the chambers 27 and 34 on the side opposite to the welding and cutting means. When the sheet is cut, the sheet edge of the bag-like sheet A is folded outward from the edge of the corrugated box B by the minimum required amount, and the tightly inserted insertion into the corrugated cardboard box B is completed.

After the insertion of the bag-like sheet A, the cardboard box B is conveyed from the sheet insertion position β in FIG. 6 in the cross-dot direction in the drawing and sent to the next process.

In short, the bag-like sheet A, which has been conveyed to the opening side of the cardboard box B by the opposed rollers 3, 3, is heat-sealed at the welding cutting section 4 located a predetermined distance ahead of the opening end of the cardboard box B. , and after cutting the front side of the heat-sealed part, hold the leading end of the sheet A open with the opening 5 located at the leading end of the bag-shaped sheet A,
Next, a cardboard box B is inserted into the opened tip of the sheet A, and after inserting the cardboard box B, with the tip of the sheet A held open,
The free portion of the bag-shaped sheet A as the non-retained portion is tightly inserted into the cardboard box B by the air blowing pressure from the air nozzles 7, 7 mentioned above.

As a result, unlike the conventional device using negative pressure suction means, the positive air pressure from the air nozzles 7, 7 described above acts efficiently in the direction of bringing the bag-like sheet A into close contact with the inner wall surface of the corrugated box B, thereby reducing air loss. The effect is extremely small.

In addition, since the structure is such that the bag-like sheet A is brought into close contact with the inside of the cardboard box B by blowing air from the air nozzles 7, 7 mentioned above, it is not necessary to insert the sheet by moving up and down inside and outside the cardboard box as in the conventional example. This eliminates the need for a frame, which has the effect of making the device smaller and more compact.

Moreover, the insertion position of the cardboard box B by the above-mentioned insertion plate 6 is set to the side opposite to the welded cutting part, in other words, the insertion position of the insertion plate 6 is
Since it is set at the position corresponding to one of the chambers 27 and 34 on the side, when the insertion of the bag-like sheet A is completed, the folding distance of the bag-like sheet A from inside the cardboard box B to the outside of the cardboard box B is equal to the above-mentioned one. Chamba 2
It is regulated to the minimum necessary predetermined amount corresponding to the lengths of sheets 7 and 34, which has the effect of eliminating waste of sheets A.

Furthermore, the above-mentioned vacuum suction device applies a negative pressure suction force of 2 between the time when air blowing starts and the time when the sheet A is approximately inserted into the cardboard box B, and between the time when the sheet A is approximately inserted into the cardboard box B and the time when the insertion is completed. This makes it possible to act on the vacuum suction device step by step, which has the effect of reducing the driving load of the vacuum suction device.

In other words, in the conventional device as seen in U.S. Pat. No. 4,537,584, suction that can sufficiently hold the sheet against the inversion of the sheet due to air blowing is generated between the time when air blowing starts and the time when sheet insertion is completed. Although it is necessary to apply force, in this example, from the time when air blowing starts until the sheet A is almost inserted, the sheet A is sufficiently held against the sheet inversion caused by air blowing, as in the conventional case. Although it is necessary to apply as much suction force as possible, from approximately the time of insertion to the time of completion of insertion,
A relatively small suction force is required to hold the folded portion of the sheet A, and as a result, the driving load of the vacuum suction device can be reduced.

In particular, when using a horizontal sheet automatic insertion device as shown in FIGS. 1 to 6, the overall height of the device can be made extremely low.

In addition, if a completely continuous bag-like sheet without perforations is used as the bag-like sheet A, this bag-like sheet A
By cutting the roll to an arbitrary length, it is possible to handle various cardboard boxes B of different sizes, so it is possible to avoid the trouble of replacing the original roll 2 depending on the size of the cardboard box B.

7 to 12 show a vertical sheet automatic insertion device, and in this embodiment, a belt conveyor device 41 as a box conveying means for conveying the cardboard box B is placed in front of the insertion plate 6 that reciprocates in the vertical direction. and
A transfer guide plate 43 is disposed between the feeding end of the endless belt 42 in this conveyor device 41 and the insertion plate 6 at the above-mentioned standby position.

In other respects, this embodiment is substantially the same as the previous embodiment shown in FIGS. 1-6. In other words, Fig. 7 corresponds to Fig. 1, Fig. 8 corresponds to Fig. 2, Fig. 9 corresponds to Fig. 3, Fig. 10 corresponds to Fig. 4, and Fig. 11 corresponds to Fig. 1. Corresponding to Figure 5, the first
Since FIG. 2 corresponds to FIG. 6 and has almost the same effect as the above-described embodiment, the same parts in FIGS. 7 to 12 as in FIGS. 1 to 6 are designated by the same numbers and symbols. The detailed explanation will be omitted.

In the correspondence between the structure of this invention and the above-mentioned embodiments, the sheet winding part of this invention corresponds to the raw roll 2 of the embodiments, and the open case corresponds to the cardboard box B, and the sheet The conveying means corresponds to the opposed rollers 3, 3, the welding and cutting means corresponds to the welding and cutting section 4, the opening means corresponds to the opening 5, the case insertion means corresponds to the insertion section 6, and the air blowing means corresponds to the welding and cutting section 4. corresponds to the air nozzle 7, but the present invention is not limited to the configuration of the above-described embodiment.

For example, instead of the opposed rollers 3 and 3 described above, a cylinder is provided with a suction member for sucking negative sheet pressure at the tip of the piston rod, and the reciprocating movement of the piston rod of this cylinder causes the bag-like shape of the material roll 2 to be removed. It may be configured to convey the sheets A in predetermined amounts.

Further, as the open case, in addition to the above-mentioned cardboard box B, a paper box, a wooden box, or the like may be used.

Furthermore, other heat sealing means may be used instead of the flat line impulse sealing means using the flat metal sealing plates 14 and 18.

Furthermore, instead of melt cutting using the hot wire 20, a cutting means using a cutting blade such as a cutter may be used.

On the other hand, although air cylinders are used as the above-mentioned cylinders 11 and 23, other fluid cylinders such as hydraulic cylinders may also be used. In particular, when the reciprocating stroke is small, a solenoid may also be used.

Furthermore, in the above embodiment, one of the units 9, 10 and the suction parts 21, 22 is fixed and the other is movable. A rack and pinion mechanism may also be used to move them relative to each other.

Further, chambers 26, 27, 33, 34 and suction holes 2 formed in the suction parts 21, 22 described above
8, 29, 35, and 36 are formed in multiple stages vertically and horizontally along the sheet insertion direction and the width direction of the cardboard box B, and the negative pressure suction device for each chamber is controlled by the CPU based on the shape of the cardboard box B. If configured in this way, it becomes possible to automate sheet insertion corresponding to various types of irregularly shaped cardboard boxes B.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional view of a horizontal sheet automatic insertion device, FIG. 2 is a cross-sectional view showing the process of heat sealing and cutting a bag-like sheet, and FIG. 3 is a cross-sectional view of a bag-like sheet. Cross-sectional view showing the opening process, No. 4
The figure is a cross-sectional view showing the process of moving the cardboard box to the sheet insertion position, FIG. is a cross-sectional view of the vertical sheet automatic insertion device, FIG. 8 is a cross-sectional view showing the process of heat sealing and cutting the bag-like sheet, FIG. 9 is a cross-sectional view showing the process of opening the bag-like sheet, and FIG. 10 is a cross-sectional view of the cardboard box. FIG. 11 is a cross-sectional view showing the step of inserting the bag-like sheet, and FIG. 12 is a cross-sectional view showing the completion of insertion of the bag-like sheet. A... Bag-shaped sheet, B... Cardboard box, 2...
Original fabric roll, 3... Opposing roller, 4... Welding cutting section, 5... Opening, 6... Insertion plate, 7... Air nozzle, 25, 32... Vacuum member, 26, 27, 3
3, 34... Chamba, 28, 29, 35, 36
...Sheet suction hole.

Claims (1)

[Scope of Claims] 1. A sheet winding section 2 for winding a long bag-like sheet A; and a sheet winding section 2 for rolling the sheet A in the sheet winding section 2 into an open case B.
a sheet conveyance means 3 for conveying to the opening side of the open case B; Welding and cutting means 4 for cutting the bag-like sheet A; and opening means 5 for holding the tip of the bag-like sheet A open.
and an opening means 5 inside the tip of the opened bag-shaped sheet A.
A case insertion means 6 for inserting the open end of the open case B to the corresponding position; and after inserting the open end of the open case B into the tip of the sheet A, the unretained portion of the bag-shaped sheet A is inserted into the open case B using air blowing pressure. and an air blowing means 7 for bringing the pair of vacuum members 25 and 32 into close contact with each other.
, chambers 26 , 27 , 33 , 34 that are divided into a plurality of chambers 26 , 27 , 33 , 34 in which the interior of the pair of vacuum members 25 , 32 is divided into a plurality of sections corresponding to the insertion direction of the open case B, and a sheet that communicates with each of these chambers 26 , 27 , 33 , 34 . The opening case B includes suction holes 28, 29, 35, and 36, and the opening case B
The insertion position is set to the position corresponding to one of the chambers 27 and 34 on the side opposite to the welding and cutting means, and from the time when air is started to be blown into the open case B of the bag-shaped sheet A until the time when the same sheet A is almost inserted. A negative pressure suction force is applied to all the chambers 26, 27, 33, and 34, and from the time when the sheet A is almost inserted until the time when the insertion is completed, the negative pressure suction force is applied only to the chambers 27 and 34 at the case corresponding position. A device for inserting sheets into open cases equipped with a vacuum suction device.