JPS6238997Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field] This invention transports a thermoplastic synthetic resin film such as polyethylene or polypropylene (including a flat tube) intermittently, and during this stoppage, processes the film strip, for example. This relates to equipment that performs bag-making processing, perforation-like cut processing, perforation processing, cutting processing, packaging processing, etc.

[Prior art]

Conventionally, in this type of processing equipment, for example, a bag making machine, bag material strips made of film strips, flat tubes, etc. supported by a fabric support device are continuously processed by a pair of continuously operating conveyors (including rollers) that hold the bag material strips. This is fed out and further transferred by a pair of intermittent operation conveyors (including rollers) of the sandwich type, and a bag material band slackening section is provided between the two sets of conveyors, and the bag material band in this part is slackened in a parabolic shape. Alternatively, as in Japanese Patent No. 1114094 (Japanese Patent Publication No. 57-3581), the upstream side is high and the downstream side is sloped low, and is supported and transported by an inclined belt conveyor.

Among the above methods, the former method of not supporting the bag material band at all is such that when the bag material band is conveyed with an impact by the downstream intermittent operation conveyor, the bag material band in the slack part flies up due to the impact. In particular, when the film thickness of the bag material band is 15 μm or less, the inclination becomes remarkable. In addition, in the latter case, since it is supported by an inclined belt conveyor, the above-mentioned floating phenomenon hardly occurs, and static electricity is generated due to the friction, and the inclined belt conveyor and the bag material band are charged. When static electricity is different from positive to negative,
Furthermore, due to the adsorption effect caused by this static electricity, the floating phenomenon is completely prevented, and an extremely excellent effect is exhibited.

However, depending on the relative relationship between the material of the bag material band, the material of the printing ink on its surface, and the material of the inclined belt conveyor, the static electricity charged on the inclined belt conveyor and the bag material band may become of the same polarity. When this happens, the bag material band cannot come into contact with the conveying surface of the inclined belt conveyor at all, and may float on top of the conveyor surface.
On the other hand, an extremely unstable floating phenomenon occurred, and the bag material band was reversed or wrinkled, making further processing impossible.

In order to eliminate these drawbacks, the applicant developed a bag material band transfer device (see Fig. 8) using an inclined belt conveyor as a suction disk, and applied for
Although the application has been filed as No. 170343 (Utility Model Application No. 59-75031), the following drawbacks still occur as a result of experiments.

As shown in Fig. 8, between the processing section A on the downstream side and the inclined belt conveyor B, the bag material belt F
The amount of slack increases or decreases with the movement of the intermittent operation conveyor C, but since the guide rollers are not provided near the top surface of the inclined belt conveyor B, the bag material band is
As the amount of slack increases or decreases, the bag material band is pulled up in a direction perpendicular to the surface of the bag material band, and as a result, it flutters due to air resistance.As a result of this flapping phenomenon, wrinkles occur in the bag material band, and the bag material band travels in a meandering manner. becomes. In addition, as the amount of slack increases or decreases, the suction area of the bag material strip of the inclined belt conveyor changes, so a large amount of air is sucked in from the suction disk part that is far from the film, making it difficult to maintain the bag material strip in a stable position with a constant suction force. Incur consequences.

〔the purpose〕

This invention improves the drawbacks of the prior art and eliminates the flapping phenomenon of the bag material band due to air resistance by arranging guide rollers at specific positions with respect to the inclined belt conveyor. The main object of the present invention is to provide a bag material strip transfer device for a bag making machine that can transfer the bag material strip without meandering while suctioning the bag material strip over almost the entire length of the bag material strip.

〔composition〕

This invention is aimed at achieving the above-mentioned main purpose, and consists of a continuous conveyor on the upstream side and a pair of intermittent operation conveyors on the downstream side. The apparatus is a device for conveying a bag material strip, and is provided with an inclined belt conveyor whose upstream side is high and downstream side is inclined to support the relaxed bag material strip between the two sets of conveyors, and the belt of the inclined belt conveyor is It is air permeable, and there is a suction device with a group of suction holes or slits on the lower side of the inclined belt conveyor of this conveying section, which suctions the upper bag material band through this inclined belt conveyor and is connected to a vacuum pump. The conveyor belt is provided in contact with or close to the lower surface of the belt, is sucked over almost the entire length of the inclined belt conveyor, is turned back to the upstream side once at the downstream side portion, and the trailing belt conveyor is sucked at this folded leading portion. A guide roller is provided near the upper surface of the inclined belt conveyor that guides the bag material strip, which is moving toward the upstream side of the inclined belt conveyor while making contact along the upper surface of the part, to the downstream side at least once again and guides it to the intermittent operation conveyor. very close to
A bag material belt transfer device for a bag making machine is characterized in that the bag material belt transfer device is disposed with its axis being horizontal between the intermediate portion and the upstream end.

Next, this invention will be explained based on the illustrated representative embodiment.

In Figures 1 to 7, 10 is a fabric support device, which is usually supported by passing a support shaft 11 through a bag material band F wound around a core tube in a roller shape. Support. The bag material band F supported by this original fabric support device is first passed through a pair of continuous operation conveyors (including rollers) 12 of a pair of clamping type installed on the upstream side of the bag making machine, and a continuous bag material band F is manufactured from this. The bag material band F is loosened between the continuous operation conveyor 12 and the processing section 13 by passing it through the processing section 13 of the bag machine, for example, the welding device section, and then passing it through a pair of intermittent operation conveyors (including rollers) on the downstream side. An inclined belt conveyor 15 is provided below the section, and is inclined higher on the upstream side and lower on the downstream side. % faster.

The above is the same as the known device. In particular, in this invention, the belt 16 of the belt conveyor 15 is made of an air-permeable material, typically coarse cloth, or a mesh or flat rubber belt with many small holes distributed over its entire surface. It is made of a type of long string, multi-stranded string, or in younger cases a type of narrow belt.

A suction device consisting of a suction box 18a or a suction tube 18b having a group of suction holes 17 or slits is provided below the conveyance section of the belt 16 of this belt conveyor. These suction boxes 18a or suction pipes 18
b is connected to a vacuum pump 19.

When the bag material strips F are transported in double rows, the width of the belt 16 is approximately equal to the width of the bag material strips F, and the belts 16 are moved by the pair of rollers 15a of the belt conveyor 15 by the number of bag material strips F to be transported. , 15b, and a large number of small holes 16a for suction are arranged in a row at approximately equal intervals along both side edges of each belt 16, and the suction pipe 18b is arranged at a lower position opposite to these small holes 16a.
Alternatively, the slit or suction hole group 17 of the suction box 18a is present.

As shown in FIG. 3, the suction box 18a is a flat suction box whose width corresponds approximately to the width of the inclined belt conveyor 15. Further, as an embodiment of the suction pipe 18b, the one shown in FIGS. 4 and 5 is a perforated roller 18c having a horizontal axis in a direction perpendicular to the conveyance direction of the inclined belt conveyor 15.
It is provided to rotate at the same speed as the circumferential speed of the inclined belt conveyor 15, and an inner cylinder 21 having a slit 20 in the axial direction in the upper part is fitted therein. The inner cylinder is fixed to the machine frame 22, and only the upper side of each perforated roller 18c always attracts suction. Reference numeral 23 denotes driving gears (including sprocket gears) fixed to both ends of the perforated roller 18c.

The suction tube 18b shown in FIG. 6 consists of several tubes that are long in the conveying direction, and suction hole groups 17 are arranged in a row on the upper surface thereof. Even if an axially long suction slit is provided in place of the suction hole group 17, there is no difference in this invention.

24 is very close to the upper surface of the belt 16 of the inclined belt conveyor 15, and
A guide roller is arranged with its axis horizontal between the middle part and the upstream end of the inclined belt conveyor 15, and is attracted to the upper surface of the belt 16 from the upstream side to the downstream side of the inclined belt conveyor 15, and is The bag material band F, which is once folded back to the upstream side and moves toward the upstream side of the inclined belt conveyor while contacting the folded leading part along the top surface of the trailing part that has been sucked, is again folded to the downstream side and several pieces are Through a zigzag path 25 formed by another guide roller of
It has a function to guide you to 4.

26 is a detection sensor for detecting the folding amount of the bag material band F and switching the speed of the continuous operation conveyor 12 on the upstream side to a rapid forwarding speed when the amount is reduced to a predetermined value, and is preferably an optical sensor. is good, but you can also use an inexpensive micro switch.

[Action and effect]

The operation of this device constructed as above will be explained next along with the effects.

The bag material band F, which relaxes between the two sets of conveyors 12 and 14, is sucked along almost the entire length of the inclined belt conveyor 15, and is sucked along the downstream side of the inclined belt conveyor 15.
After being turned back at F ₀ , the bag is intermittently transferred to the intermittent operation conveyor 14 on the downstream side while being guided by the guide roller 24 and subjected to bag making processing.

When the folding amount of the bag material strip decreases to a predetermined value or more due to this intermittent transfer, the detection sensor 2
6 detects this, sets the continuous operation conveyor 12 on the upstream side to fast forward, and increases the amount of turnback.
The bag material strip is always maintained in a state where it is attracted over the entire length of the inclined belt conveyor 15.

By arranging the guide rollers 24 as described above, an increase or decrease in the amount of loosening of the bag material band F, that is, an increase or decrease in the amount of folding on the downstream side, is absorbed on the upper surface of the inclined belt conveyor 15 over almost its entire length. This occurs as a result of changes in the length of the bag material strip being folded and the preceding bag material strip folded over this, and the amount of slack changes only by movement in the length direction of the bag material strip. , it is possible to obtain an appropriate amount of relaxation without any air resistance, no flapping phenomenon or meandering phenomenon during intermittent transfer of the bag material belt, and no excessive tension. Even if the material band F is towed, the bag material band F
does not float above the inclined belt conveyor 15, therefore does not turn over or wrinkle, and does not provide much resistance to being pulled by the intermittent operation conveyor 15.

Therefore, extremely thin films can be transported stably at all times without being affected by the material, and since they are adsorbed under reduced pressure on the inclined belt conveyor 15, there is no particular restriction on the angle of inclination, even on steep inclinations. It is also possible to reduce the installation area.

[Effects of embodiment]

When the suction device is one flat suction box 18a as shown in FIGS. 2 and 3, the structure is simple and there is no failure.

As shown in FIGS. 4 and 5, when the suction device is a perforated tube that rotates in the same direction as the belt 16, the belt 16 and the suction tube 18b are in rolling contact, and there is no frictional resistance. In particular, although the perforated cylinder 18c rotates around its axis, the suction holes by the inner cylinder 21 having the slits 20 are limited to the portion in contact with the belt 16 and the vicinity thereof, so that the vacuum suction effect acts efficiently.

The one shown in FIG. 6 is one in which suction pipes 18b, which is a type of suction device, are provided in the conveyance direction, and in the illustrated example, the number of suction pipes 18b is 4 to 6.
There is little contact resistance with 6, and the structure is simple and does not cause failure. In addition, the number of suction tubes 18b is increased to 6 12
If you keep it as a book, etc., you can use two strips of bag material strip F in parallel.
Even when bag making is carried out simultaneously with three strips, the number of suction pipes 18b that suck each bag material band F is the same,
There is no fear that a specific bag material band F will be strongly attracted.

By arranging small holes 16a on both side edges of the belt 16 and providing the suction hole group 17 or the slits opposite to these small holes 16a, when the bag material strips F are transported in double rows, each bag material can be The band F can be reliably sucked at both side edges and transferred in a stable posture.

[Brief explanation of the drawing]

The illustrations show typical embodiments of this invention, in which Fig. 1 is a schematic side view of the entire bag making machine, Fig. 2 is a side view showing only the inclined belt conveyor, and Fig. 3 is a side view showing only the inclined belt conveyor. The figure is a perspective view of an inclined belt conveyor with a part of the belt cut out, FIG.
6 is a perspective view showing yet another embodiment of the suction tube, FIG. 7 is a perspective view of an embodiment in which several belts are hung, and FIG. 8 is a perspective view of a conventional example. FIG. 1 is an overall schematic diagram of a bag making machine. In the figure, 12... Continuous operation conveyor, 14...
Intermittent operation conveyor, 15... Inclined belt conveyor, 16... Belt, 18a... Suction box, 18
b... Suction pipe, 24... Guide roller.

Claims (1)

[Scope of utility model registration request] A continuous conveyor is provided on the upstream side, and a pair of intermittent operation conveyors of the sandwich type is provided on the downstream side, and these two sets of conveyors convey a series of bag material strips. An inclined belt conveyor having an upstream side and a lower downstream side is provided to support the loose bag material strip between the conveyors, and the belt of said inclined belt conveyor is air permeable, and the belt of said inclined belt conveyor is air permeable, and the belt of said inclined belt conveyor is air permeable. A suction device having a group of suction holes or slits connected to a vacuum pump is provided on the side of the inclined belt conveyor to suck the bag material band thereon, and is in contact with or close to the lower surface of the belt, and is connected to a vacuum pump. It is attracted to the top surface of the belt from the upstream side to the downstream side of the belt conveyor, is turned back to the upstream side once at this downstream side portion, and is tilted while contacting the folded leading portion along the top surface of the suctioned trailing portion. A guide roller that guides the bag material band moving toward the upstream side of the belt conveyor by folding it back downstream again and transferring it to the intermittent operation conveyor comes very close to the upper surface of the belt of the inclined belt conveyor, and is located in the middle of the belt. What is claimed is: 1. A bag material belt transfer device for a bag making machine, characterized in that the bag material belt transfer device is disposed between a section and an upstream end with its axis being horizontal.