JP4310557B2 - Bag opening method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bag opening method and apparatus for forming an opening for taking out contents from a powder bag filled and sealed with powder.
[0002]
[Prior art]
In a wide range of industrial fields such as foods, pharmaceuticals, and chemicals, various powders are used for product manufacturing and product processing. Powder is filled in a powder bag made of a material such as paper or cloth at a milling manufacturer, sealed and shipped.
Usually, as a simple means to take out the powder that is the contents, unwind the sewing thread that closes the powder bag, open the bag mouth wide, or cut the bag surface with a cutter to form the opening surface It was.
In addition, mechanically, the central portion of the powder bag is cut with a blade rotating at high speed, or the central portion of the bag is cut into two with cutting blades provided on the upper and lower sides, and the contents are directly put into the hopper.
[0003]
[Problems to be solved by the invention]
The powder bag is filled with powder in a state where no foreign matter is mixed and there is no contamination. There is a risk that adhering dust and dirt will enter the bag and mix with the powder.
In particular, powder bags are formed in multiple layers with paper, plastic sheets, cloth, etc., and when a cutter is used, the cutting process is repeated, so paper, plastic sheets, cloth, etc. Mixing with powder could not be avoided. Such a thing fouls the powder and eliminates the product value, and must be carefully taken.
In addition, when it is performed manually by a worker, there is a danger from the use of the cutter, and in addition, there is a health problem due to dust generation when the powder in the powder bag is discharged.
Furthermore, there is a so-called air feeding means that opens a part of the powder bag and sends the powder to other places by air suction. However, depending on the type of powder, the powder adheres to the nozzle, piping, etc. for air feeding. In some cases, it was not possible to send by air
[0004]
Furthermore, in the method in which the powder bag is cut and the contents are directly put into the hopper, the cutter is installed above the hopper, so that all of the powder bag chips and cutter blade spilled blades are in the hopper. There was a risk of getting in.
[0005]
In view of the various problems associated with the conventional means for opening a powder bag, the present invention uses a pair of cutters and forms an X-shaped cutter line on the lower surface of the powder bag being transferred to form a powder. An object of the present invention is to provide a method and an apparatus for opening a powder bag in which an opening is expanded by its own weight and powder can be automatically put into a hopper.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is configured by a pair of cutters 3 and 4 that are positioned at both ends orthogonal to the transfer direction of the powder bag 1 that is transferred in a certain direction and that can run linearly in parallel. An X-shaped cutter line is formed on the lower surface of the bag 1.
In addition, the present invention enables a pair of cutters 3 and 4 positioned at both ends orthogonal to the transfer direction of the powder bag 1 transferred in a fixed direction to be reciprocated linearly in parallel with the transfer of the powder bag 1. Each cutter 3 and 4 is made to travel, and an X-shaped cutter line can be formed on the lower surface of the powder bag 1.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 show an apparatus used in the method of the present invention. In each figure, reference numeral 1 denotes a powder bag filled and sealed with powder. As shown in FIG. 2, the powder bag 1 having the same structure as that of the prior art is transferred in a certain direction as indicated by an arrow A by a transfer device 2 such as a belt conveyor or a roller conveyor, and a pair of powder bags 1 is transferred in front of the transfer of the powder bag 1. Cutters 3 and 4 are installed.
[0008]
The cutters 3 and 4 are positioned at both ends of the lower surface of the powder bag 1 being transferred at both ends perpendicular to the transfer direction of the powder bag 1 (see FIG. 1), and have a space in the front and rear along the transfer direction of the powder bag 1. (Refer to FIG. 2). Each cutter 3, 4 travels linearly in a direction orthogonal to the transfer direction of the powder bag 1 during transfer to form an X-shaped cutter line on the lower surface of the powder bag 1. .
[0009]
As a mechanism for causing the cutters 3 and 4 to travel linearly, for example, a conventionally known ball screw mechanism can be used.
FIGS. 3 and 4 show an example of the ball screw mechanism. Since both the cutter 3 and the cutter 4 have the same structure, the case of running the cutter 3 will be described.
[0010]
A cylindrical guide body 6 is fixed between the bearings 5 and 5 installed on both sides of the lower surface of the powder bag 1 in the transfer direction, and a ball screw 7 is inserted into the guide body 6. 5 is rotatably supported.
An annular moving member 8 is fitted in the ball screw 7 in the guide body 6, and the moving member 8 can move in the left-right direction in FIG. 3 according to the rotation of the ball screw 7. A support body 9 projects from the upper part of the moving member 8, and the cutter 3 is fixed on the support body 9 in a vertical state.
[0011]
As shown in FIG. 4, guide grooves 10 are formed on the entire upper surface of the guide body 6, and the support body 9 is positioned between the guide grooves 10, so that the moving member can be moved by rotating the ball screw 7. 8 does not rotate, for example, moves in the direction of arrow B in FIG. 3, and therefore the cutter 3 runs linearly along the guide body 6. If the ball screw 7 is reversed, the cutter 3 is fed back to a predetermined position and stopped.
[0012]
Such a traveling mechanism of the cutters may be installed in a parallel state in a state orthogonal to the transfer direction of the powder bag 1, and the cutters 3, 4 may be installed so as to be able to travel. Is positioned forward and backward along the transfer direction of the powder bag 1 by the distance of the travel mechanism, and each cutter 3, 4 travels linearly from one end to the other end of the powder bag 1.
[0013]
In order to rotate the ball screw 7, the gears 11 and 12 are directly connected to one end side of each ball screw 7, and the gears 11 and 12 are rotatably meshed as shown in FIG. Then, the drive gear 13 is meshed with one gear, for example, the gear 11, and the drive gear 13 is rotated by a reversible motor 14 as shown in FIG.
Note that the entire travel drive mechanism and rotational drive mechanism using gears are supported by a support member 15, and this support member 15 can be moved up and down by one or a plurality of cylinders 16.
[0014]
The apparatus used for the method of the present invention is as described above. Next, the opening operation of the powder bag 1 by the cutters 3 and 4 will be described.
The cutters 3 and 4 are normally positioned below the transfer surface of the powder bag 1, and when the powder bag 1 reaches a predetermined position, the position is detected by a detector (not shown) such as a limit switch or an infrared sensor. ).
[0015]
When the position of the powder bag 1 is detected, the cylinder 16 is actuated to raise the cutters 3 and 4 and the motor 14 is driven to rotate the gears 11 and 12 via the gear 13. The cutters 3 and 4 travel with the pierced state. By adjusting the traveling speed of the cutters 3 and 4 and the transfer speed of the powder bag 1 in advance, an X-shaped cutter line is formed on the lower surface of the powder bag 1.
[0016]
A suction cup 17 is set on the upper surface of the powder bag 1 along with the start of the cutting operation by the cutters 3 and 4, the powder bag 1 is sucked by the vacuum pressure, and the powder bag 1 separated from the transfer device 2 is moved in the same direction (arrow A). Direction). Further, during the transfer of the powder bag 1 by the transfer device 2, the direction of the powder bag 1 is corrected so that the powder bag 1 does not become oblique with respect to the transfer direction.
[0017]
FIG. 5 shows the traveling direction of the cutters 3 and 4 and the cutter line with respect to the powder bag 1, the cutter 3 travels from the start point a to the end point a1, and the cutter 4 travels from the start point b to the end point b1. Accordingly, the cutters 3 and 4 travel in a straight line from the opposite direction.
[0018]
While the cutters 3 and 4 are traveling, the powder bag 1 is also moved in the A direction. Therefore, the cutters 3 and 4 are oblique to the powder bag 1, that is, the cutter lines X and Y intersect between the diagonal lines of the powder bag 1. Will be formed into a shape. Therefore, although the cutters 3 and 4 are actually traveling in a straight line, an oblique traveling line is formed, and the cutter 3 reaches the end point a2 and the cutter 4 reaches the end point b2.
[0019]
When the cutter lines X and Y are formed in the X shape on the lower surface of the powder bag 1 in this way, the cutter lines X and Y are pushed and spread by the weight of the powder, and the powder is greatly expanded from the opening surface. It will fall naturally. For this reason, if the hopper 18 is installed next to the travel position of the cutters 3 and 4 and the hopper 18 is installed in front of the powder bag 1 in the transfer direction, the powder is put into the hopper 18 immediately after the cutter lines X and Y are formed. Will be thrown in. Depending on the nature of the powder, it may not fall easily, and the powder in the four corners of the powder bag 1 may not fall easily. In such a case, the suction cup 17 is forced to vibrate up and down forcibly. You may make it fall.
The cutters 3 and 4 descend after forming the cutter lines X and Y, reverse the motor 14, return to the start point ab of the cutters 3 and 4, which are normal positions, and wait.
[0020]
In the above description, the ball screw mechanism is used as the traveling mechanism of the cutters 3 and 4, but is not limited to this. For example, a chain mechanism capable of reciprocating circulation is used and supported by the chain. The cutters 3 and 4 may be projected in a vertical state via the body 9. Or you may make it drive | work reciprocating the cutters 3 and 4 with a cylinder mechanism. The cutters 3 and 4 may be sharp ones that are conventionally used, but it is optimal to use an ultrasonic cutter that can be cut by ultrasonic vibration.
[0021]
【The invention's effect】
As described above, according to the present invention described above, a pair of cutters 3 and 4 are installed at both end positions orthogonal to the transfer direction of the powder bag 1 during the transfer of the powder bag 1. The bag 1 travels in a straight line parallel to the opposite direction along the direction orthogonal to the transport direction, and the powder bag 1 is adjusted by adjusting the travel speed of the cutters 3 and 4 and the transport speed of the powder bag 1. An X-shaped cutter line can be formed on the lower surface of the powder bag 1 along the diagonal line of the powder bag 1.
[0022]
The four triangular bag pieces formed by the cutter line are expanded by the weight of the powder and open greatly, so that the powder can be put into the hopper 18 simultaneously with the formation of the cutter line. Become.
In particular, since the hopper 18 is installed adjacent to the cutters 3 and 4 and is disposed in front of the powder bag 1 in the transfer direction, even if chips of the powder bag 1 are formed by the cutters 3 and 4, Neither enters nor the spilled blade enters the hopper 18.
[0023]
According to the present invention, the opening operation of the powder bag 1 can be performed automatically and continuously, which is suitable for a large amount of powder processing. In particular, an ultrasonic cutter is used as the cutters 3 and 4. For example, since the cut surface of the bag surface is clean, chips such as paper and cloth forming the bag are not generated, and foreign matter is not mixed into the powder.
[Brief description of the drawings]
FIG. 1 is a front view of an apparatus showing an embodiment of the present invention.
FIG. 2 is a side view of an apparatus showing an embodiment of the present invention.
FIG. 3 is a front view showing an example of a cutter traveling mechanism.
4 is an enlarged plan view of a main part of the cutter travel mechanism shown in FIG. 3; FIG.
FIG. 5 is a plan view of a powder bag showing a cutter line of the cutter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Powder bag 2 Transfer device 3 Cutter 4 Cutter 5 Bearing 6 Guide body 7 Ball screw 8 Moving member 9 Support body 10 Guide groove 11 Gear 12 Gear 13 Gear 14 Drive motor 15 Support member 16 Lifting cylinder 17 Suction cup 18 Hopper

Claims (2)

An X-shaped cutter line is formed on the lower surface of the powder bag 1 by a pair of cutters 3 and 4 that are positioned at both ends orthogonal to the transfer direction of the powder bag 1 that is transferred in a certain direction and that can run linearly in parallel. A bag opening method characterized by forming. A pair of cutters 3 and 4 positioned at both ends perpendicular to the transfer direction of the powder bag 1 transferred in a certain direction can be reciprocated linearly in parallel, and each cutter 3 and 4 can be moved along with the transfer of the powder bag 1. A bag opening device characterized by being able to run and form an X-shaped cutter line on the lower surface of the powder bag 1.

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