JPH0749289B2 - Bag opening mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag opening expanding mechanism,
In particular, the present invention relates to a bag opening / expansion mechanism suitable for a bag making apparatus used for a packer apparatus for powder particles.

[0002]

2. Description of the Related Art Conventionally, in order to open and close a bag that is in close contact with each other, the vicinity of the opening of the bag is opened and closed by adsorbing the upper and lower (front and back) suction pads with upper and lower suction pads. The mechanism is known. In this type of opening / expanding mechanism, the movable upper suction pad generally comes close to / separates from the fixed lower suction pad, and the bag sent from the bag making mechanism first has its opening on the lower suction pad. It is designed to be used in the vicinity.

[0003]

By the way, in such a spreading mechanism, in order for the lower suction pad to surely suck the vicinity of the opening of the bag, the upper surface of the lower suction pad is at least above the carrying level of the bag. Therefore, if the tip of the bag collides with the side surface of the lower suction pad, the vicinity of the opening of the bag may not easily ride on the lower suction pad. Therefore, an object of the present invention is to provide a bag opening / expanding mechanism that allows the bag to be smoothly placed on the lower suction pad near its opening without hitting the lower suction pad.

[0004]

In order to achieve the above object, a bag opening expanding mechanism according to the present invention comprises a lower suction pad for sucking a lower side of the bag opening and an upper side of the bag opening. An upper suction pad attached to a vertically movable movable frame for suction, a sliding frame supported by an elastic body in a vertically elastically movable state, and a sliding frame suction pad for sliding frame suction. When the movable frame starts descending, the upper surface of the lower suction pad is positioned below the upper surface of the sliding frame, the sliding frame is pushed down by the descending movable frame, and the sliding frame suction pad is used. The sliding frame has been sucked, and the upper surface of the lower suction pad is located above the upper surface of the sliding frame when it is sucked by this sliding frame suction pad. I have been to so that.

[0001]

In this opening / spreading mechanism, the sliding frame is provided, and when the bag is introduced, the bag is supported and introduced by the upper surface of the sliding frame which is above the upper surface of the lower suction pad. Therefore, the bag can be smoothly placed on the lower suction pad near the opening without hitting the lower suction pad.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the bag opening / opening mechanism according to the present invention will be described below with reference to the drawings based on a bag making apparatus incorporated in a white rice packer apparatus. The packer device 1 includes a bag making device 2 and a white rice feeding device 3. In other words, the bag making device 2 forms a bag 5 independent of the long flat film tube 4, and the white rice 6 is charged into the bag 5 by the white rice charging device 3 to be packed. The description of the white rice feeding device 3 is omitted.

First, the long flat film-shaped tube 4 processed by the bag making apparatus 2 will be described (FIG. 3).
And FIG. 4). The size of the bag 5 used to pack the white rice 6 is from 1 kg for packing to 5 kg, 10 kg, 1
The tubes 4 are limited to some types, for 5 kg, and the width size W of the tube 4 corresponding to each size is used.
In other words, the tube 4 is cut and sealed for each constant lengthwise dimension L to form the various bags.
The longitudinal dimension L to be cut is also uniquely determined according to the width size W of the tube 4. In this embodiment, marks 9 are provided on the edge portion 7 of the tube 4 at a constant position in the width direction (Z direction in the drawing) from the edge 8 of the tube 4 at a pitch P according to the longitudinal dimension L to be cut. It is printed. This mark 9 is detected by an optical sensor 10 described later, the size of the bag 5 to be formed is discriminated by the detection of this mark 9, and other mechanisms such as the bag making device 2 are controlled. The size of the bag 5 to be formed may be determined by detecting the pitch of both edges 8.

Next, the bag making apparatus 2 will be described. The bag making device 2 is composed of a winding roll 11, a bag making mechanism 12, an opening expanding mechanism 13, and an air nozzle 14. A take-up roll (FIG. 4) 11 is a take-up roll, and the long flat film tube 4 made of a synthetic resin is freely taken up and stored therein.

A bag-making mechanism 12 (FIGS. 4 and 5) is a bag-making mechanism, which is mounted and fixed on a rail 16 which is slidable in the front-rear direction (X and Y directions in the drawing). This dolly 16 has a motor 87 through a fixing nut 86.
It is slidable by being connected to a screw shaft 88 which is rotationally driven by. Then, before and after the bag making mechanism 12, respective end portions of a guide belt 18 with a spring 17 which is looped around a plurality of rotating rollers are connected. Therefore, the guide belt 18 is always formed in a flat state before and after the bag making mechanism 12 along the moving direction thereof, and the flat portion serves as a guide surface (movement reference surface) of the tube 4 as described later. The tube 4 is accurately aligned with the entrance of the bag making mechanism 12 by being guided by the guide belt 18. Instead of the guide belt 18, convex type belts may be provided before and after the bag making mechanism 12. The movement of the bag making mechanism 12 is controlled by a signal (information) from a pulse generator 19 which will be described later and is incorporated in the bag making mechanism 12.

The structure of the bag making mechanism 12 itself is shown in FIG. Reference numeral 20 is a pair of upper and lower feed rollers.
A plurality of spring belts 21 for feeding the tube 4 are wound around the feed roller 20, and one end of the feed roller 20 rotates together with the feed roller 20 to generate a number of pulses corresponding to the rotation amount of the feed roller 20. A pulse generator 19 is installed. The number of pulses is used to discriminate various bag sizes as described later.

A cutter 22 cuts the tube 4 by sandwiching it with upper and lower blades. Reference numeral 23 denotes a heat-sealed body, and by sandwiching the tube 4 between the lower heating section 24 and the upper receiving section 25, the tube 4 can be welded in the width direction to form the bottom of the bag 5. Reference numeral 26 is a fine needle for punching, which descends into each gap of the plurality of spring belts 21 to form a plurality of deaeration holes along the width direction of the tube 4. The vertical movement of the cutter 22, the heat seal body 23, and the thin needle 26 is simultaneously performed by the expansion and contraction of the cylinder 27 arranged below.

An optical sensor 10 is composed of an edge detection sensor 90 for detecting the edge 8 of the tube 4 and a mark detection sensor 91 for detecting the mark 9. The mark detection sensor 91 is located on the upper side (mark 9 of the tube 4).
It is of a reflection type that is composed of a light emission detection unit 28 on the side on which is printed, a lower reflection unit 29, and a light source unit 30. That is, the light beam emitted from the light emission detection unit 28 optically connected to the light source unit 30 once passes through the tube 4 and is reflected by the lower reflection unit 29. Then, the reflected light ray again passes through the tube 4 and returns to the original light emission detection unit 28, and the light amount of the returned light ray is compared with the light emission amount to detect the mark on the tube 4. The edge detection sensor 90 includes a light emission detection unit 92 and a light source unit 93, and detects the edge 8 by detecting the light reflected on the surface of the tube 4. The light emission detection unit 28, the reflection unit 29, and the light emission detection unit 92 of the optical sensor 10 can be mounted upside down according to the surface on which the mark 9 is printed.

The light emission detecting portion 28 is fixed to a frame 31 which is movable in the width direction of the tube 4 (Z direction in the drawing). A rack 32 is attached to the lower surface of the frame 31, and the rack 32 is reciprocally movable in the width direction by engaging the pinion 34 rotated by a motor 33 (FIGS. 7 and 8).

Opening / expanding mechanism (FIGS. 1 and 2) 13 is an opening / expanding mechanism and sucks the vicinity of the opening 35 of the bag 5 formed by the bag making mechanism 12 from above and below (front and back). By doing so, the opening 35 is expanded. An air cylinder 36 moves a U-shaped movable frame 37 up and down. This movable frame 3
An erection frame 39 that is vertically movable while being urged downward by a spring 38 is provided above 7 and two erection pads 40 and two upper rubber legs 41 face downward on the erection frame 39. It is located at Reference numeral 42 denotes a fixed frame, which includes two lower suction pads 43 corresponding to the two upper suction pads 40, two sliding frame suction pads 44 on the outside thereof and two lower suction pads 43 corresponding to the two upper rubber legs 41.
Two lower rubber legs 45 are arranged facing upward. The two lower suction pads 43 are arranged with a slight positional deviation with respect to the two upper suction pads 40, and are supported by an elastic body, specifically, a spring 46 so as to be elastically movable in the vertical direction. The sliding frame 47 can be projected relatively upward. And the sliding frame suction pad 44
Is arranged at a position slightly lower than the lower suction pad 43.

An air nozzle (FIGS. 1 and 2) 14 is an air nozzle and is attached to the tip of a swing arm 48 that swings in synchronization with the movable frame 37. The center of the swing arm 48 is rotatably supported by the fixed frame 42, and a long hole 49 is formed at the other end. A pin 50 provided on the movable frame 37 is slidably engaged in the elongated hole 49. Therefore, the air nozzle 14 rises as the upper suction pad 40 descends, and both upper and lower suction pads 40 and 43 sandwich and suck the opening 3 of the bag 5, and at the same time, open the opening 35 of the bag 5.
Are positioned close to each other. And the air is opened 3
The upper suction pad 40 and the lower suction pad 43 are used to more fully open and expand the opening 35. Further, since the air nozzle 14 descends as the upper suction pad 40 rises, it does not interfere with the swing arm 51 described later.

Next, the operation will be described. Opening mechanism 13 and air nozzle 1 according to the present invention
Before describing the method for opening and expanding the opening of the bag according to No. 4, a bag-making method for forming the bag 5 from the tube 4 will be described. That is, a case will be described in which the bag 5 for packing 10 kg is first formed, and the rice 5 is packed in the bag 5 using the bag 5. The tube 4 delivered from the winding roll 11 is guided into the bag making mechanism 12 while being placed on the surface of the guide belt 18 via a plurality of guide rollers. The optical sensor 10 operates from the moment the tip of the tube 4 is introduced into the bag manufacturing apparatus 2.

Edge Detection Operation (FIG. 3) First, the edge detection sensor 90 of the optical sensor 10 moves the edge 8 of the tube 4 while moving in the width direction Z of the tube 4.
The edge detection operation of locating is performed. When the edge detection sensor 90 detects the edge 8, the edge detection sensor 90 further moves based on the detection position, and this time the mark detection sensor 91 is positioned on the print line of the mark 9 on the tube 4. Therefore, the mark 9 printed at a fixed position on the edge portion 7 of the tube 4 can be detected from the edge 8.

Pitch Detection (Bag Size Discrimination) Operation (FIG. 3) Next, the tube 4 introduced into the bag making mechanism 12 is fed by the feed roller 20 along the edge 8 of the bag 5, that is, in the longitudinal direction, in the feeding direction. As the mark is conveyed, the mark detection sensor 91 detects each mark 9, and at the same time, the pulse generator 19 counts the number of pulses corresponding to the pitch P between the marks 9 (one pulse corresponds to 1 mm in this embodiment). To do. That is, at the same time that the mark detection sensor 91 detects the first mark 9a, the pulse generator 19 starts counting pulses,
The conveyance of the tube 4 (rotation of the feed roller 20) is stopped by the detection of the second mark 9b, and at the same time, the counting of pulses is stopped. Since the pitch P of the mark 9 is printed in advance according to the size of the tube 4, it is possible to determine that the type of the bag 5 to be bagged is the bag 5 for packing 10 kg, based on the number of pulses counted at this time. Become.

Return Operation (FIG. 5) Next, the feed roller 20 reversely rotates by one pitch P to return the tube 4, and the cutter 22 is positioned relative to the first cut line 78a immediately before the first mark 9a. The tip unnecessary part 8 whose dimensions are not accurate by cutting there
Cut off 4. This cutting edge becomes the front end 89 of the first bag 5. Note that this returning operation is performed even when a new take-up roll 11 is used, or when there is a tip unnecessary portion 84 whose dimensions are not accurate.

Size Corresponding Operation (FIGS. 4 and 5) The signal (pulse number) corresponding to the tube 4 for packing 10 kg is detected by the pitch P detection operation between the marks 9 and the bag making mechanism 1
2 is transmitted to the motor 87 of the truck 16 to which 2 is mounted. That is, the bag making mechanism 12 receives the signal from the pulse generator 19 so that the tube 4 is fed by the feed roller 20 so that the distance from the front end position 77 of the bag making apparatus 2 to the cutting position matches the longitudinal dimension L of the bag 5. It moves back and forth while holding it and stops. That is, at this time, the position of the bag making mechanism 12 corresponding to the bag 5 for packing 10 kg is determined. At this time, the cutter 22 is positioned corresponding to the cut line 78b of the first bag 5 and the heat seal body 23 is positioned corresponding to the seal portion 79, respectively.

Cutting / Sealing Operation (FIG. 5) Next, the tube 4 is sent out by the pitch P (for the number of pulses) in the sending direction, and the cut line 78b and the seal portion 79 are positioned relative to the cutter 22 and the heat seal body 23. To be done. At this time, the cut opening (the front end 8
9) corresponds to the front end position 77 of the bag making apparatus 2. Then, by the operation of the cylinder 27, the cutter 22 and the heat seal body 23 sandwich the tube 4, and at the same time, the fine needle 26 descends. The predetermined cut line 78b is cut, and the seal portion 7
9 is sealed (bottom seal in this embodiment), and a plurality of deaeration holes are formed along the seal portion 79 by the fine needle 26. Thus, the bag 5 for putting and sealing the white rice 6 was formed. The deaeration holes are for removing the internal air after the white rice 6 is packed in a bag. Then, the following description will be given to the opening expanding mechanism 13 according to the present invention.
Is the explanation.

Opening and Opening Operation of Opening Portion (FIGS. 1 and 2) In the bag 5 having the bottom seal, the opening portion 35 is introduced between the upper suction pad 40 and the sliding frame 47.
First, the upper suction pad 40 is lowered by the air cylinder 36. At this time, the lower suction pad 43 is located slightly below the sliding frame 47, and will not be caught by the lower suction pad 43 even when the bag 5 is introduced. The upper suction pad 40 continues to descend as it is, and stops with the sliding frame 47 being held between the upper rubber leg 41 and the lower rubber leg 45. In this state, the sliding frame 47 is slightly lowered by pressing the upper rubber leg 41, and the lower suction pad 43 is positioned slightly above the upper surface of the sliding frame 47. Adsorb on the bag 5. The descending state of the sliding frame 47 is maintained as it is because the sliding frame 47 is sucked by the sliding frame suction pad 44. And both upper and lower suction pads 4
At 0 and 43, the suction operation is performed. After the suction, the upper suction pad 40 rises, and the opening 35 of the bag 5 is expanded with it. On the other hand, the air nozzle 14 ascends as the upper suction pad 40 descends and ascends due to the rotation of the swing arm 48, and as it is adsorbed, the air nozzle 14 is closely positioned toward the opening 35. Then, air is blown onto the opening 35 from the tip of the air nozzle 14. By doing so, the opening expanding mechanism 13
In addition to the function of assisting the opening and spreading by the air, air enters the bag 5 through the opening 35, and the vacuum contact state of the bag 5 is eliminated, so that the subsequent operation of adding the white rice 6 by the white rice introducing device 3 becomes easy. . This air nozzle 14 blows air,
The upper suction pad 40 descends as it rises. By repeating the above operation continuously, the opening portion 35 of the bag 5 formed by the bag manufacturing apparatus 2 can be surely opened and expanded in preparation for the later addition of the white rice 6.

[0023]

As described above, the bag opening / expanding mechanism according to the present invention is introduced by supporting the bag by the upper surface of the sliding frame which is above the upper surface of the lower suction pad when the bag is introduced. Therefore, it is possible to effectively prevent the trouble that the bag collides with the side surface of the lower suction pad and does not get on the lower suction pad, and there is an effect that a smooth opening and closing can be performed.

[0024]

[Brief description of drawings]

FIG. 1 is a side view showing an opening expanding mechanism and an air nozzle.

FIG. 2 is a partial cross-sectional view taken along the line AA in the figure.

FIG. 3 is a schematic explanatory view showing a manner in which a tube is formed into a bag.

FIG. 4 is a schematic side view showing an entire packer device incorporating an air nozzle.

FIG. 5 is an enlarged side view of the bag making mechanism.

FIG. 6 is a side view showing a light emission detection unit and a reflection unit of the mark detection sensor.

7 is a partially cutaway side view showing the moving mechanism of the optical sensor as seen from the direction of arrow B in FIG.

FIG. 8 is a partially cutaway plan view seen from the direction of arrow C in FIG.

[Explanation of symbols]

 5 ... Bag 13 ... Opening mechanism 35 ... Opening 37 ... Movable frame 40 ... Upper suction pad 43 ... Lower suction pad 44 ... Sliding frame suction pad 47 ... Sliding frame 46 ... Spring (elastic body)

Claims (1)

[Claims] 1. A lower suction pad for lower suction of a bag opening,
An upper suction pad attached to a vertically movable movable frame for suctioning the upper side of the bag opening, a slide frame supported by an elastic body in a vertically elastically movable state, and a slide frame suction slide. When the movable frame starts to descend, the upper surface of the lower suction pad is positioned below the upper surface of the sliding frame, and the sliding frame is pushed down by the movable frame that has descended. A sliding frame suction pad is used to suck the sliding frame, and the upper opening of the lower suction pad is located above the upper surface of the sliding frame in a state of being sucked to the sliding frame suction pad.