JPH0885517A - Bag mouth-twisting device for bagging/packaging machine - Google Patents

Abstract

PURPOSE: To change the tightness of a package in response to the fed quantity or characteristic of an article in a bag by changing a twisting quantity of the bag mouth. CONSTITUTION: A bag mouth-twisting device is equipped with gripping arms 12 which grip both sides of an outer peripheral part 52b of an article storage part 52 of a bag 51 where articles are fed while being supported under a suspended condition, and rotate the bag 51, driving motor 30 which rotates the gripping arms 12, and rotating quantity-setting button which rotates the driving motor 30 by an optional rotating quantity, or controller which rotates the driving motor 30 by a set rotating quantity based on a signal of a photo-electric type switch to detect a fed quantity of the articles in the bag 51. By this constitution, a twisting quantity of a bag mouth part 53 is accurately changed. Also, when the bagged package 51 after the twisting is completed is transferred to a bag mouth part-tying device, a pressing plate 48 which comes into contact with the twisted bagged package 51 and maintains the twisted quantity is provided. By this method, the twisted quantity after the twisting process of the bag mouth part 53 is maintained to the bag mouth part-tying device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag filling and packaging machine in which the open end of the bag to which articles are supplied is supported.
The present invention relates to a twisting device for twisting the mouth of a bag a plurality of times as a pre-processing for binding the bag mouth with a tape or the like with a binding device.

[0002]

2. Description of the Related Art As a device for twisting a bag mouth portion in a pretreatment for binding the bag mouth portion after supplying an article to the bag, JP-A-2-85116 (Reference 1) and JP-A-55-55. -11
There is one shown in Japanese Patent No. 6540 (Reference 2). In Reference 1, the bag is placed on a rotary table with the open end of the bag being supported, and the mouth of the bag is twisted by the rotation of the rotary table. In Reference 2, the bag mouth is twisted while being tightened.

[0003]

In each of the above-mentioned Reference No. 1 and Reference 2, the mouth of the bag is twisted while the amount of twist of the bag mouth is set to a constant amount. . Therefore, in the case of packing multiple types of articles in a bag filling and packaging machine, when the property (eg, flexibility) or quantity of the articles supplied to the bag is changed, a predetermined amount of twist Only the amount (rotation amount) can be given. Therefore, it is pointed out that there is a problem that the packaging finish after bundling lacks tightness (tightening degree of the article storage portion of the bag) or, conversely, when it is not desired to finish it tightly, it is finished tighter than necessary.

In order to solve the above-mentioned problems of the prior art, the present invention changes the twist amount of the bag mouth portion and changes the tightness of the packaging in accordance with the supply amount and the property of the articles in the bag. It is an object.

[0005]

In the bag mouth twisting device of a bag filling and packaging machine according to the first aspect of the present invention, the bag mouth twisting device for holding and rotating a bag which is supported in a suspended state and to which articles are supplied is rotated. Means, rotation driving means for rotating the bag mouth twisting means, and rotation amount setting means for rotating the rotation driving means by an arbitrary rotation amount.

In the bag mouth twisting device of the bag filling and packaging machine according to the second aspect of the invention, a bag mouth twisting means for holding and rotating a bag which is supported in a suspended state and supplied with articles, and the bag mouth. Rotational driving means for rotating the twisting means, means for detecting the supply amount of the articles in the bag, and control means for rotating the rotation driving means at a set rotation amount based on the value detected by the bag article supply amount detecting means. It has and.

In the third invention, in addition to the first or second invention, the bag mouth portion binding device is connected to the bag mouth portion twisting device, and the bagged package after twisting is transferred to the binding device. At the time of doing, it is equipped with a twist holding means that abuts on the twisted bag package and maintains the twist amount.

In the fourth invention, the bag mouth portion twisting means of the first or second invention is arranged on both sides of the outer peripheral portion between the bottom portion and the bag mouth portion of the article storage portion of the bag into which the articles are supplied. It has a pinching mechanism for pinching.

[0009]

In the first invention, the rotation amount setting means for rotating the rotation driving means by an arbitrary rotation amount is used, and in the second invention, the rotation driving means is rotated at the set rotation amount based on the value detected by the bag article supply amount detecting means. The amount of twist of the bag mouth portion changes depending on the means.

In the third aspect of the invention, the twist holding means maintains the twist amount of the bag mouth portion after the twisting process up to the bag mouth portion binding device. In the fourth aspect of the invention, the holding mechanism rotates while holding both sides of the outer peripheral portion of the article storage portion of the bag.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bag mouth twisting device of a bag filling and packaging machine according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the bag mouth portion twisting device 1 is installed adjacent to a conventionally known bag mouth portion binding device 2 which is the next step. The bag 51 in which the articles are supplied to the article storage unit 52 is supported by the bag gripping transfer device 3 at the opening end portion 53a of the bag mouth portion 53 and is hung and horizontally in the bag transfer direction P as shown in FIG. To the bag mouth part binding device 2 through the bag mouth part twisting device 1.
The bag mouth twisting device 1 will be described in detail below. In the bag mouth twisting device 1, the carry-in side of the bag 51 is the front side (the lower side of FIG. 2), and the carry-out side of the bag 51 facing the bag mouth binding device 2 is the rear side (the upper side of FIG. 2). Both sides orthogonal to the bag transfer direction P are referred to as a left side and a right side (left and right sides in FIG. 2), respectively.

(Regarding the bag mouth twisting means A for holding and rotating the bag 51) As shown in FIGS. 1 and 3, a pillar 6 is mounted on a mounting plate 5 which is erected at the lower end between the left and right machine frames 4. The slide shaft 7 is supported in the column 6 so as to be vertically movable along the axis 7a. A slide arm 8 is rotatably supported on the upper end portion of a slide shaft 7 above the column 6 so as to be rotatable about an axis 7a, and cam portions 9 are provided on both sides of the slide arm 8 at a point symmetrical position of 180 degrees with respect to the axis 7a. Is extended horizontally. Guide grooves 9a extending in a direction orthogonal to the axis 7a are provided in the cam portions 9 in a point-symmetrical manner.

Below the slide arm 8, a driven toothed pulley 10 on the outer periphery of the column 6 is rotatably supported around the axis 7a of the slide shaft 7. As shown in FIGS. 3 and 4, support arm portions 11 are attached to both sides of the driven toothed pulley 10, and both cam portions 9 of the slide arm 8 are inserted into the support arm portions 11. . In the sandwiching arm 12 as a sandwiching mechanism on both the support arm portions 11, the lower end portion of the tilting lever 13 is rotatably supported around the horizontal axis of the support shaft 14 on the support arm portions 11. The holding piece 15 is attached to the holding plate 15 attached to the upper part of the tilt lever 13.
6 (elastic members made of sponge or soft rubber material) are attached to face each other, and cam rollers 18 are supported by cam levers 17 extending from the lower end portions of both tilt levers 13 to support both sides of the slid arm 8. It is inserted and fitted in the guide groove 9 a of the cam portion 9.

As shown in FIGS. 1 and 5, the buffer rod 2 is attached to a pair of brackets 19 attached to the outside of the right machine casing 4.
0 is vertically movably inserted, the head portion 20a at the upper end of the buffer rod 20 is locked on the bracket 19 to prevent the buffer rod 20 from moving downward, and the lower ends of the buffer rods 20. A buffer plate 21 is attached between the parts. A compression coil spring 22 is wound around the outer periphery of each buffer rod 20 between the buffer plate 21 and both brackets 19, and the elastic force of the compression coil spring 22 causes each buffer rod 20 to be wound.
The buffer plate 21 is urged downward, and the head portions 20a of the buffer rods 20 are locked on the bracket 19 against the elastic force thereof. An air cylinder 23 is attached to the cushion plate 21 between both brackets 19, and a piston rod 23a thereof projects downward. A pair of bearings 24 are attached to the mounting plate 5 inside the right machine frame 4, and a first interlocking lever 26 and a second interlocking lever 27 are integrally rotatable on a support shaft 25 on both bearings 24. It is attached. The piston rod 23a of the air cylinder 23 is connected to the first interlocking lever 26. Long holes 28 are provided on both sides of the support column 6 so as to extend in the vertical direction. Slide pins 29 are provided on both sides of the lower end of the slide shaft 7 so as to project outward from both elongated holes 28 of the column 6.
The second both interlocking levers 27 are provided with notches 27a, and both ends of the slide pin 29 are engaged with the notches 27a.

Therefore, when the piston rod 23a of the air cylinder 23 moves up and down, each interlocking lever 2
6, 27 are tilted in the vertical direction about the bearing 24, the slide pin 29 is pushed in the vertical direction along the long hole 28 of the support 6 by the notch 27a of the second interlocking lever 27, and the slide shaft 7 slides. Moves up and down with 8. Along with the vertical movement, the cam rollers 18 of the cam levers 17 of the two holding arms 12 move along the guide grooves 9a of the cam portions 9 of the slide arms 8 while the cam levers 17 center on the support shafts 14 on the support arm portions 11. Turn up and down. Therefore, the tilting levers 13 of the both holding arms 12 are also supported by the support shafts 14.
The gripping pieces 16 of both gripping arms 12 open and close with respect to each other.

When the driven toothed pulley 10 rotates together with both supporting arm portions 11, both nipping arms 12 rotate around the axis 7a of the slide shaft 7, and the cam levers 17 of both nipping arms 12 rotate. By pressing both cam portions 9, the slide arm 8 rotates around the axis 7a.

(Regarding the means B for rotationally driving the bag mouth portion twisting means A) A drive motor 30 with an electromagnetic brake is installed on a mounting plate 5 near the left machine frame 4, and a pulley with drive teeth rotated by the motor 30. A belt 32 with driving teeth is stretched between 31 and the pulley 10 with driven teeth via a tension roller 33. Therefore, the motor 3
By 0, both holding arms 12 of the bag mouth twisting means A rotate in the rotation direction Q of FIG.

(Regarding the means C for setting the rotation amount of the rotation driving means B) A rotation amount detecting sensor 34 is attached below the drive motor 30. The sensor 34 is a slit plate 3 that rotates together with the drive toothed pulley 31.
5 and a photocoupler 3 for detecting the slit plate 35
6 and the photo coupler 36 is a slit plate 3
The number of pulses of light passing through 5 is detected. As shown in FIG. 7, the photocoupler 36 is connected to a controller 37, and the controller 37 detects the rotation amount (pulse number) of the drive motor 30 based on the input signal from the photocoupler 36. A rotation amount setting button 38 is connected to the controller 37, and when a desired rotation amount is set by the button 38, the set rotation amount is input to the controller 37. Then, the controller 37 compares the set rotation amount with the detected rotation amount and stops the drive motor 30 when the rotation amounts match.

(Regarding the means D for detecting the supply amount of the articles in the bag 51) As shown in FIGS. 2 and 6, the bracket 3 on the left machine frame 4 on the bag loading side of the bag mouth twisting device 2 is shown.
9, an upper photoelectric switch 40a, a middle photoelectric switch 40b, and a lower photoelectric switch 40c as a bag article supply amount detection sensor are attached, and the photoelectric switches 40a, 40b, 40c and the right machine frame are attached. The heights of the light projected and received are different from that of the reflection plate 41 on the upper surface of the optical disc 4. Therefore, when the bag 51, which is supported by the bag gripping transfer device 3 in a suspended state and moves in the bag transfer direction P, passes through the light emitting / receiving range of each photoelectric switch 40a, 40b, 40c, each photoelectric switch 40a. , 40b, 40c may be blocked by the article storage portion 52 of the bag 51.
By the way, any of the photoelectric switches 40a, 40b, 4
When the light of 0c is not blocked, the product supply amount is the smallest, and the lower, middle and upper photoelectric switches 40c, 40
When the upper photoelectric switch 40a having the highest light-transmitting / receiving light of b and 40a is cut off, the supply amount of the article becomes maximum. Each photoelectric switch 40a, 40b. The controller 40c is connected to the controller 37, and the controller 37 detects the amount of articles supplied based on input signals from the photoelectric switches 40a, 40b, 40c.

(Regarding the means E for rotationally controlling the bag mouth twisting means A on the basis of the value detected by the bag article supply amount detecting means D) The controller 37 controls the light from the photoelectric switches 40a, 40b, 40c. When none of the light is blocked, when the light of the upper photoelectric switch 40a is blocked, when the light of the middle photoelectric switch 40b is blocked, and when the light of the lower photoelectric switch 40c is blocked. The set rotation amount of the drive motor 30 (the set pulse number of the rotation amount detection sensor 34) is stored separately. Then, the controller 37, based on the input signal from each photoelectric switch 40a, 40b, 40c,
Similar to the rotation amount setting means C, the drive motor 30 is rotated at any set rotation amount.
By the way, the larger the product supply amount, the smaller the set rotation amount.

(Regarding the twist holding means F that abuts on the article storage portion 52 of the twisted bag 51 to maintain the twist amount) Guided to the mounting plate 42 on the left side machine frame 4 above the bag mouth twisting device 1. While the rod 43 is attached, the guide plate 45 is attached to the mounting plate 44 on the right side machine frame 4 so as to face the guide rod 43, and a bag guide is provided between the guide rod 43 and the guide plate 45. A passage 46 is provided along the bag transfer direction P. When the bag 51 supported in a suspended state by the bag gripping transfer device 3 moves from the carry-in side of the bag mouth twisting device 1 toward the bag mouth binding device 2 on the carry-out side, the bag mouth part 53 is guided. The passage 46 is loosely held by the guide rod 43 and the guide plate 45. An air cylinder 47 is attached to a mounting plate 42 on the left machine frame 4, and a holding plate 48 is attached to a piston rod 47a of the air cylinder 47. The pressing plate 48 extends below the guide rod 43 along the bag guide passage 46 and faces the boundary between the bag mouth 53 and the bag storage 52. A compression coil spring 47b is wound around the outer periphery of the piston rod 47a, and the elastic force of the spring 47b causes the pressing plate 48 to project toward the bag guide passage 46 side. When the piston rod 47a moves back and forth while being guided by the guide rod 49 attached to the pressing plate 48, the pressing plate 48 presses the boundary between the bag mouth 53 and the article storage 52 diagonally downward. , It is possible to take a state of separating from this boundary.

(Bag mouth twisting device 1 configured as described above
As described above, there are cases where the bag article supply amount detecting means D and the rotation amount setting means C are used to set the rotation amount of the drive motor 30 as described above.
First, the former case will be described.

As shown in FIGS. 2 and 6, the bag 51 (bag-filled package) to which the articles are supplied is supported by the bag gripping transfer device 3 in a suspended state, and the bag loading side of the bag mouth twisting device 1 is carried out. Then, the controller 37 detects the article supply amount in the article storage unit 52 based on the input signals from the photoelectric switches 40a, 40b, 40c of the bag article supply amount detection means D, and based on the detected value. The set rotation amount of the drive motor 30 is selected.

As shown in FIGS. 1 and 2, the bag mouth portion 53 is inserted into the guide passage 46 to guide the guide rod 43 and the guide plate 45.
When the bag 51 is stopped between the two holding arms 12 of the bag mouth twisting means A in a state of being loosely held between the piston and the piston rod 23a of the air cylinder 23, as shown in FIG. Both sides of the outer peripheral portion 52b of the article storage unit 52 are clamped by the clamping pieces 16 of both the clamping arms 12. Immediately after that, the drive motor 30 rotates in the rotation direction Q of FIG. 2, rotates by the set rotation amount, and then stops. Therefore, the bag mouth portion 53 is twisted by the set rotation amount.

Next, the piston rod 23a of the air cylinder 23 is moved upward to open both the sandwiching arms 12 again, and at the same time or slightly sooner, the air cylinder 47 is turned off, and the piston rod 47a thereof becomes the compression coil spring 47b. The elastic plate projects by the elastic force, and the pressing plate 48 presses the article storage portion 52 by the elastic force. After this twist is completed, the bag 51
Are again transferred to the bag mouth unit binding device 2. In this case, a force in the same direction as the twisting direction (rotational direction Q in FIG. 2) is generated in the pressure contact portion of the article storage unit 52 with which the pressing plate 48 is in contact, and the twisting amount is maintained by the force.

Next, when the bag 51 reaches the bag mouth portion binding device 2, the tape 5 is attached to the twisted bag mouth portion 53 as shown in FIG.
4, the opening end portion 53a of the bag mouth portion 53 is cut, and the bag 51 is separated from the bag gripping transfer device 3 and collected. A string may be used instead of the tape 54.

On the other hand, when the rotation amount setting button 38 of the rotation amount setting means C is used to arbitrarily set the rotation amount of the drive motor 30, the bag mouth portion 5 is also operated in the same manner as described above.
Three twists are made.

The above embodiment has the following characteristics (a) to (f). (A) As described above, since the amount of twist of the bag mouth portion 53 can be changed by controlling the amount of rotation of the drive motor 30, it is possible to provide tightness according to the amount of articles supplied in the bag 51. .

(B) For those that do not like tightness due to the property of the article, etc., the twist amount of the bag mouth portion 53 is set to a desired value and the tightness according to the property of the article in the bag 51 is set. Can be given.

(C) The amount of articles supplied in the bag 51 is detected,
In the case where the twist amount of the bag mouth portion 53 can be set based on the detected value, the bag 5 can be used for an article requiring tightness.
It is possible to automatically set the amount of twist according to the amount of articles supplied in 1 and to keep the tightness constant even if the articles supplied to the bag 51 have different sizes. You can

(D) The bag mouth portion 53 is the next step after the twisting treatment of the bag mouth portion 53 is finished in order to enhance the packaging ability of the machine.
In the case of the bag filling and packaging machine configured to perform the bundling process, the amount of twist can be maintained after the bag mouth portion 53 is twisted.
It becomes possible to deliver the bag 51 to the bag mouth binding device 2 while maintaining the tightness of No. 1, and the packaging finish can be a desired finish depending on the twist amount.

(E) When the bag 51 is held by sandwiching both sides of the outer peripheral portion 52b of the article storage section 52 of the bag 51 into which the articles are supplied, the bottom 52a of the article storage section 52 is rotated from below to the rotary table or the like. In comparison with the conventional technique of supporting and twisting by the above, the rotation amount is not insufficient due to the bottom portion 52a of the article storage unit 52 rising due to the rotation. Even when a lightweight article is supplied, the article storage unit 52
With the outer peripheral portion 52b being sandwiched from both sides thereof, the twisting operation can be reliably performed based on the set twist amount.

(F) Since the article storage portion 52 is sandwiched by the sandwiching pieces 16 (flexible material), when the unnecessary pressure contact force acts on the article storage portion 52, the sandwiching piece 16 absorbs the pressure contact force. To fulfill a cushioning function and protect the articles in the article storage section 52 without being crushed. Also, both clamping pieces 1
If an excessive pressure contact force is applied to 6, both clamping pieces 16
Since the air cylinder 23 that applies a pressure contact force to the member moves against the elastic force of the compression coil spring 22 and both clamping pieces 16 slightly open to perform a cushioning function, the products in the product storage unit 52 are further protected. can do.

Considering the above embodiment, the following (a) to
It can be understood as the technical idea of (d). (A) In the bag mouth portion twisting means A of claim 4, the holding mechanism (holding arm 12) on the rotating body (the driven toothed pulley 10) rotated by the drive motor 30 of the rotation driving means B.
Is supported so that it can be opened and closed, and a mechanism (slide shaft 7, slide arm 8, cam portion 9,
Cam lever 17, cam roller 18, slide pin 29,
Interlocking levers 26 and 27, an air cylinder 23, etc.) are provided.

(B) In the opening / closing mechanism of (a) above, the sliding body (slide shaft 7, slide arm 8)
A cam mechanism (cam portion 9, cam lever 17, cam roller 18) is provided between the holding arm 12 and the holding arm 12. Also,
Driving means for sliding the sliding body (slide pin 29,
Interlocking levers 26 and 27 and an air cylinder 23) are provided.

(C) In the sliding body driving means of (b) above, the sandwiching arms 12 are closed and the bag 51 is placed between them.
An elastic body (compression coil spring 22) having an elastic force that opposes the force in the direction in which both the holding arms 12 are opened is provided.

(D) In the twist holding means F of claim 3, the driving means (air cylinder 4
7) A pressing plate 48 which is moved closer to and away from the same is provided along the passage 46, and the pressing plate 48 and the article storage section 52 of the bag 51 are provided.
The rotation direction Q is opposite to the bag transfer direction P at this pressure contact portion so that a force in the same direction as the twisting direction (rotation direction Q) is generated at the pressure contact portion between and.

[0039]

In the bag mouth twisting device of the bag filling and packaging machine according to the first and second inventions, the twisting amount of the bag mouth is changed so that the packaging can be performed in accordance with the supply amount and the property of the articles in the bag. The tightness can be changed.

In the third invention, in addition to the effects of the first and second inventions, after the bag mouth is twisted, the tightness of the bag is maintained and the bag is handed over to the bag mouth binding device to twist the packaging finish. A desired finish depending on the amount can be obtained.

In the fourth aspect of the invention, in addition to the effects of the first and second aspects of the invention, both sides of the outer peripheral portion of the article storage portion of the bag can be clamped so that the bag can be reliably twisted based on the set twist amount. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state before completion of twisting in the bag mouth portion twisting device according to the present embodiment.

FIG. 2 is a transverse sectional view of the same.

FIG. 3 is a partially enlarged sectional view of FIG.

FIG. 4 is a side view taken along line XX of FIG.

5 is a partial side view taken along the line YY of FIG.

FIG. 6 is a partial front view taken along line ZZ of FIG.

FIG. 7 is an electric block circuit diagram relating to the bag mouth twisting device of the present embodiment.

FIG. 8 is a vertical cross-sectional view showing a state after completion of twisting in the bag mouth portion twisting device according to the present embodiment.

FIG. 9 is a partial perspective view showing a bag mouth portion bound by a bag mouth portion binding device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bag mouth part twisting device, 2 ... Bag mouth part binding device, 3 ... Bag gripping transfer device, A ... Bag mouth part twisting means, 12 ... Clamping arm as a clamping mechanism, 23 ... Air cylinder, B ... Rotation drive means , 30 ... Drive motor, 34 ... Rotation amount detection sensor, 37
... controller, C ... rotation amount setting means, 38 ... rotation amount setting button, D ... bag article supply amount detecting means, 40a, 40
b, 40c ... Photoelectric switch, E ... Control means, F ... Twist holding means, 47 ... Air cylinder, 48 ... Holding plate, 51 ...
Bag, 52 ... Article storage section, 53 ... Bag mouth section, 54 ... Tape.

Claims (4)

[Claims] 1. A bag mouth twisting means (A) for holding and rotating a bag (51) supported in a suspended state and supplied with articles, and a rotation for rotating the bag mouth twisting means (A). A bag mouth twisting device in a bag packaging machine, comprising: a drive means (B); and a rotation amount setting means (C) for rotating the rotation drive means (B) by an arbitrary rotation amount. 2. A bag mouth twisting means (A) for holding and rotating a bag (51) supported in a suspended state and supplied with articles, and a rotation for rotating the bag mouth twisting means (A). Driving means (B) and means (D) for detecting the supply amount of articles in the bag (51)
And a control means (E) for rotating the rotation drive means (B) at a set rotation amount based on a detection value by the bag article supply amount detection means (D). Bag mouth twisting device. 3. A bag mouth portion bundling device (3) connected to a twisted bagging package when the bagging package after twisting is transferred toward the bundling device (3). The bag mouth twisting device in the bag filling and packaging machine according to claim 1 or 2, further comprising a twist holding means (F) for maintaining a twist amount. 4. The bag mouth portion twisting means (A) according to claim 1 or 2, wherein the bottom portion (52a) of the article storage portion (52) of the bag (51) to which the article is supplied is provided. Bag mouth (5
A bag mouth twisting device in a bag filling and packaging machine, comprising a holding mechanism (12) for holding both sides of an outer peripheral portion (52b) between the bag and the packaging machine (3).