JPH0735162B2 - Bag opening mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bag opening / expanding mechanism, and more particularly to a bag opening / expanding mechanism suitable for a bag-making device used in a powder / packer packing device.

<Conventional technology and its problems> Conventionally, in order to open and close a bag that has been in close contact, the area around the opening of the bag is adsorbed by suction pads from the top and bottom (front and back), and both suction pads are opened and closed as they are It is known how to do it.
However, in such a conventional spreading method,
Since the bag is in close contact in a vacuum state
Opening / expanding force is required, and if the suction force of the upper and lower suction pads is weak even a little, the opening of the opening cannot be surely performed.

The present invention has been made in view of such a conventional technique, and an object of the present invention is to provide a bag opening and opening mechanism that can solve the above problems.

<Means for Solving Problems> In order to achieve the above-mentioned object, the bag opening / expansion mechanism according to the present invention includes a lower suction pad for lower suction of the bag opening and a bag opening. An upper suction pad attached to a vertically movable movable frame for upper suction, and an air nozzle attached to one end, while the other end is connected to the movable frame by loose fitting pin connection and fixed. An intermediate part is rotatably supported by the support part, and a swing arm is arranged to rotate as the movable frame descends to position the air nozzle at one end at the bag opening. It has become.

<Operation> According to such an opening opening mechanism, the air nozzle attached to the swing arm positions the bag opening in the bag opening in synchronization with the opening and closing operations of the bag opening by the upper and lower suction pads. Since air can be blown from the air nozzle to the opening of the bag that is about to be opened and closed by the upper and lower suction pads at the optimum timing, the opening of the bag is in close contact due to, for example, static electricity. Can surely be expanded. Moreover, since the swinging arm rotates in synchronization with the rise of the movable frame of the upper suction pad, the air nozzle can escape, so that the air nozzle may become an obstacle to the movement of the bag that has been opened and expanded. Without
Easy to move the bag.

<Embodiment> A preferred embodiment of the bag opening and expanding method according to the present invention will be described below with reference to the drawings on the basis of a bag making apparatus incorporated in a packer device for polished rice.

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 tube 4 processed by the bag making apparatus 2 will be described. The size of the bag 5 used for bagging the white rice 6 is limited to a certain type from 1 kg packing to 5 kg, 10 kg, 15 kg, and a tube of width W corresponding to each size. Is used. That is, the tube 4 is cut and sealed at a constant lengthwise dimension L to form the various bags, and the lengthwise dimension L to be cut according to the width size W of the tube 4 is also unique. It is determined. In the edge portion 7 of the tube 4 in this embodiment, marks 9 are provided 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. The mark 9 is detected by an optical sensor 10 described later, and the bag 5 to be formed by the detection of the mark 9
Is determined and the other mechanisms such as the bag making device 2 are controlled (see FIGS. 3 and 4). The size of the bag 5 to be formed may be determined by detecting the pitch of both edges 8.

Next, the bag making device 2 will be described.

The bag making device 2 includes a winding roll 11, a bag making device 12, a suction pad 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.

The bag-making mechanism (Fig. 5) 12 is a bag-making mechanism, and is on the rail 15 in the front-back direction (X in the figure,
It is mounted and fixed on a carriage 16 that is slidable in the Y direction). This dolly 16 is slidable by being connected to a screw shaft 88 which is rotationally driven by a motor 87 via a fixing nut 86. Then, before and after the bag making mechanism 12, each end of a guide belt 18 with a spring 17 that is wound around in a loop via a plurality of rotating rollers is connected. Therefore, before and after the bag making mechanism 12, the guide belt 18 is always formed in a flat state without sagging along the moving direction thereof,
This flat portion serves as a guide surface (movement reference surface) of the tube 4 as described later. Tube 4 is this guide belt
It is precisely aligned with the inlet of the bag making mechanism 12 by being guided by 18. The guide belt 18
Instead of, the convex type belts may be provided before and after the bag making mechanism 12, respectively. 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 denotes 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. A pulse generator 19 for generating a number of pulses corresponding to the rotation amount of the feed roller 20 is attached. The number of pulses is used to discriminate various bag sizes as described later.

Reference numeral 22 denotes a cutter, which cuts by sandwiching the tube 4 with upper and lower blades.

23 is a heat seal body, which is a lower heating unit 24 and an upper receiving unit 25.
By sandwiching the tube 4, the tube 4 can be welded in the width direction to form the bottom portion of the bag 5.

26 is a fine needle for drilling holes,
A plurality of deaeration holes are formed along the widthwise direction of the tube 4 by descending to the respective gaps 21.

And these cutter 22, heat seal body 23, and fine needle 26
The up and down movements of are 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. Mark detection sensor 91
Is the upper side (the side corresponding to the surface of the tube 4 on which the mark 9 is printed) of the light emission detecting section 28, the lower reflecting section 29, and the light source section 30.
It is a reflective type composed of and. 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 passes through the tube 4 again and returns to the original light emission detection section 28, and the light quantity of the returned light ray is compared with the light emission quantity to detect the mark on the tube 4. The edge detection sensor 90 is composed of a light emission detection section 92 and a light source section 93, and detects the edge 8 by detecting the light reflected on the surface of the tube 4. still,
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 detection unit 28 is fixed to a frame 31 that is movable in the width direction of the tube 4 (Z direction in the drawing). This frame
The rack 32 is attached to the bottom of the 31.
Is engaged with the pinion 34 which is rotated by the motor 33, and can reciprocate in the width direction (FIGS. 7 and 8).

The suction pad mechanism (FIGS. 1 and 2) 13 is a suction pad mechanism, and by sucking the vicinity of the opening 35 of the bag 5 formed by the bag making mechanism 12 from above and below (front and back), The opening 35 is opened and expanded.
An air cylinder 36 moves a movable frame 37 shaped like a mold up and down. Above the movable frame 37, an erection frame 39 that is vertically movable while being urged downward by a spring 38 is provided. The erection frame 39 has two upper suction pads 40 and two upper rubber legs. 41 is facing down. A fixed frame 42 includes two lower suction pads 43 corresponding to the two upper suction pads 40 and two outside suction pads 43.
4 sliding frame suction pads 44 and 2 front and rear upper rubber legs
Two lower rubber legs 45 corresponding to 41 are arranged facing upward. The two lower suction pads 43 are the two upper suction pads.
Each of them is arranged with a slight positional deviation with respect to 40, and can relatively project upward from a sliding frame 47 supported by a spring 46. The sliding frame suction pad 44 is arranged slightly below 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 central portion of the swing arm 48 has a support portion 48S connected to the fixed frame 42.
It is rotatably supported by and has a long hole 49 at the other end.
Are formed. 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 the upper and lower suction pads 40 and 43 are opened in the bag 5.
At the same time as sandwiching and sucking 35, it is positioned close to the opening 35 of the bag 5. Then, the air is blown out toward the opening portion 35 so that the upper suction pad 40 and the lower suction pad 43 attempt to expand the opening portion 35 more completely. 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.

Before describing the method for opening and expanding the opening of the bag by the suction pad mechanism 13 and the air nozzle 14 according to the present invention, a bag manufacturing method for forming the bag 5 from the tube 4 will be described. That is, first, a case will be described in which the bag 5 for packing 10 kg is formed, and the rice 5 is packed using the bag 5. Take-up roll
The tube 4 sent from 11 passes through a plurality of guide rollers and is placed on the surface of the guide belt 18 in a bag-making mechanism.
Guided into 12. The optical sensor 10 is activated from the moment the tip of the tube 4 is introduced into the bag making apparatus 2.

Edge Detection Operation (FIG. 3) First, the edge detection sensor 90 of the optical sensor 10 performs an edge detection operation of finding the edge 8 of the tube 4 while moving in the width direction Z of the tube 4. 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 conveyed by the feed roller 20 in the feed direction along the edge 8 of the bag 5, that is, the longitudinal direction. Therefore, 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). That is, at the same time that the mark detection sensor 91 detects the first mark 9a, the pulse generator 19 starts counting pulses, and the second mark 9b
Of tube 4 by detection of (Rotation of feed roller 20)
Stops and the pulse counting stops at the same time. 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 bag 5 to be made into a bag is a 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 the I 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, and the position is set there. Cut (cut) and cut off the unnecessary tip portion 84 whose dimension is not accurate. This cutting edge becomes the front end 89 of the first bag 5. It should be noted that this returning operation is performed only when using a new take-up roll 11 or the like and 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 of the truck 16 to which the bag making mechanism 12 is assembled. It is transmitted to the motor 87. That is, the bag making mechanism 12 receives the signal from the pulse generator 19 so that the tube 4 is moved by the feed roller 20 so that the distance from the front end position 77 of the bag making device 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 on the cut line 78b of the first bag 5, and the heat seal body 23 is on the seal portion 79.
Are positioned corresponding to.

Cutting / Sealing Operation (FIG. 5) Next, the tube 4 is fed in the feed direction by the pitch P (for the number of pulses), and the cut line 78b and the seal portion 79 are positioned relative to the cutter 22 and the heat seal body 23. .
At this time, the cut opening (front end 89) is aligned with the front end position 77 of the bag making apparatus 2. The cutter 22 and the heat seal body 23 sandwich the tube 4 by the operation of the cylinder 27, and at the same time, the fine needle 26 descends. Predetermined cut line
78b is cut, the seal 79 is sealed (bottom seal in this embodiment), and the fine needle 26 seals the seal.
Multiple vent holes are drilled along 79. 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 explanation is the explanation of the opening expanding method according to the present invention.

Opening and Opening Operation (FIGS. 1 and 2) In the bag 5 with the bottom seal, the opening 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 even if the bag 5 is introduced, the lower suction pad 43 is inserted.
Never get caught in. The upper suction pad 40 continues to descend as it is, and stops with the sliding frame 47 being sandwiched between the upper rubber leg 41 and the lower rubber leg 45. In this state, the sliding frame 47 is slightly lowered by pressing down the upper rubber leg 41,
Since the lower suction pad 43 is positioned slightly above the upper surface of the sliding frame 47, the lower suction pad 43 is surely sucked to the bag 5. The sliding frame 47 is kept in the lowered state since the sliding frame 47 is sucked by the sliding frame suction pad 44. Then, the suction operation is performed by the upper and lower suction pads 40 and 43. 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 by the lowering of the upper suction pad 40 and ascends by the rotation of the swinging arm 48, and is simultaneously positioned toward the opening 35 at the same time as suctioning. Then, air is blown from the tip of the air nozzle 14 to the opening 35. By doing so, the suction pad mechanism 13 serves to assist the expansion and expansion, and the air enters the bag 5 through the opening 35, and the vacuum contact state of the bag 5 is eliminated, so that the subsequent white rice feeding device 3 It will be easier to put white rice 6 in. The air nozzle 14 lowers as the upper suction pad 40 rises after air is blown.

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.

<Effect> Since the method for opening and expanding the opening of the bag according to the present invention has the contents described above, the following effects can be obtained.

(A) Since air is blown from an adjacent position toward the opening of the bag sucked by the suction pad mechanism by the air nozzle, the opening can be surely expanded even if the bag is in a close contact state. be able to.

(B) The operation is accurate because it operates in synchronization with the suction pad mechanism.

(C) Since the air nozzle descends immediately after blowing air, it does not interfere with other movable members.

[Brief description of drawings]

FIG. 1 is a side view showing a suction pad mechanism and an air nozzle, FIG. 2 is a partial cross-sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 4 is a schematic side view showing the entire packer device incorporating an air nozzle, FIG. 5 is an enlarged side view of the bag making mechanism, and FIG. 6 is a light emission detection part of a mark detection sensor. And FIG. 7 is a side view showing the reflection part and FIG.
FIG. 8 is a partially cutaway side view seen from the VII direction, and FIG. 8 is a partially cutaway plan view seen from the VIII direction shown in FIG. 5 …… Bag 13 …… Suction pad mechanism 14 …… Air nozzle 35 …… Opening

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 upper suction of the bag opening, and an air nozzle attached to one end, while the other end is connected to the movable frame by loose fitting pin connection. At the same time, the intermediate part is rotatably supported by a fixed support part, and the intermediate part is pivoted as the movable frame descends to position the air nozzle at one end at the bag opening. A bag opening / expanding mechanism including an arm.