JPH0794248B2 - Bag feeder of automatic packaging machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic packaging device capable of automatically containing a predetermined amount of a raw material such as powder in a bag, and more particularly to a bag feeding device for such an automatic packaging device. It relates to a bag feeding device for mounting the bag on the chute in the position.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional automatic packaging apparatus 1 (for example, Japanese Patent Laid-Open No. 4-327122). The conventional automatic packaging apparatus 1 shown in FIG. 1 is for accommodating a certain amount of raw material such as powder in a bag, and intermittently rotates a total of six chutes 3, 3 ... At the same time, the bag 7 is mounted on the chute 3 by the bag feeding device 2 at the bag feeding position A, the raw material is roughly filled in the bag 7 at the first filling position B, and the raw material is also filled in the bag 7 at the second filling position C. Is filled in a medium amount, and a small amount of the raw material is filled in the bag 7 so that the final and accurate weight is obtained at the third filling position D. Next, after the air in the raw material in the bag 7 is removed at the vacuum deaeration position E, the raw material-containing bag 70 is moved to the chute 3 at the removal position F.
Then, the empty chute 3 is returned to the bag feeding position A. The bag 70 containing the raw material removed from the chute 3 at the removal position F is the rotary lift table 1
7, the rotary lift table 17 is directed to the conveyor 19 side, and then the pusher device 18 sends the rotary lift table 17 onto the conveyor 19 and conveys it to the next process (for example, opening sealing process) side. The automatic packaging apparatus 1 is configured to perform such an operation in sequence and to successively store a fixed amount of raw material in a bag.

As shown in FIG. 2, the bag feeding device 2 in the conventional automatic packaging device 1 includes a feeding roller 10 for feeding the bags 7 one by one onto an inclined receiving base 11 and an inclined receiving base 1.
A posture changing device 12 for holding the bag 7 on the upper side of 1 in a vertical posture immediately below the chute 3 at the bag feeding position A, and a bag mouth 71 of the bag 7 closed below the chute 3 are vacuumed from front and rear sides, respectively. It has a pair of front and rear suction cups 23, 23 that can be sucked and held by suction. Also, the suckers 23, 2
3 is a position and a reference numeral 23 which are separated from each other by a reference numeral 23a.
In addition to moving the suction cups 23, 23 forward and backward with respect to the mutually close positions shown by b, the intermediate standby height H ₀ shown by the solid line and the bag mouth receiving height H ₁ shown by the reference numeral 23a and the reference numeral 23.
It can be moved up and down with respect to the bag mouth mounting height H ₂ shown by c.

On the other hand, on the chute 3 side, as shown in FIGS. 2 to 4, a bag mouth 71 covered on the outer circumference of the lower part of the chute 3.
There are provided end clamp devices 5 and 5 (left-right pair) and a main clamp device 6 for holding the left-right intermediate part of the bag mouth 71. The end clamp device 5 includes a pair of front and rear clamp members 52 for holding the left and right ends 72, 72 of the bag mouth 71 from the front and rear sides, respectively.
52. The clamp members 52, 52 are
As shown in FIG. 3, when the air cylinder 51 expands and contracts, the air cylinder 51 can be vertically arcuately rotated between the upper open position and the lower holding position indicated by the reference numeral 52a. Further, the main clamp device 6 also includes air cylinders 61, 61, respectively.
A pair of front and rear clamp members 6 operated by
It has 2, 62. The clamp member 62 on the main clamp device 6 side is formed in a semicircular arc shape along the outer peripheral surface of the chute 3, and both clamp members 62,
62 forms a circle.

Then, the automatic packaging device 1 operates as follows. That is, first, as shown in FIG. 2, the bag 7 supplied onto the inclined pedestal 11 by the supply roller 10 is erected by the attitude changing device 12 to the vertical attitude shown by reference numeral 7a.
Lower each suction cup 23, 23 from the intermediate standby height H ₀ to the bag mouth receiving height H ₁ (position 23a) → each suction cup 23
a and 23a are brought into contact with the front and rear outer surfaces of the bag mouth 71 (reference numeral 2)
3b) and close each other with the suction cups 71
Adhere and hold the front and rear facing outer surfaces respectively → Bag mouth 71
Each suction cup is separated from each other as shown by the reference numerals 23a and 23a while the front and rear facing outer surfaces of the suction cups are held and held.
(At this time, the bag mouth 71 is opened larger than the outer shape of the chute 3 as shown in FIG. 4). → The bag mouth mounting height H ₂ (reference numeral 23 while holding and sucking the bag mouth 71 by each suction cup)
(C position) to cover the bag mouth 71 on the outer periphery of the lower portion of the chute 3 → the front and rear clamp members 52, 52 on each of the left and right sides of the end clamp device 5 are pivoted downward respectively to make the bag mouth. The left and right ends 72, 72 of 71 are clamped and held from the front and rear sides (reference numeral 52a in FIGS. 3 and 4).
State) → The suction action of the suction cups 23, 23 is stopped almost at the same time as this operation → The suction cups are moved down from the height of symbol H ₂ to the intermediate standby height H ₀ → Each clamp member 62 of the main clamp device 6 , 62 are operated toward each other to clamp the bag mouth 71 over the entire circumference → Then, the chute 3 with a bag is withdrawn from the bag feeding position A to the first filling position B side as shown in FIG. (At this time, the empty chute 3 that was in the removal position F moves to the bag feeding position A). Incidentally, FIG.
In each of the positions B to F, a predetermined work is performed, and the packaging work is sequentially and automatically performed.

By the way, the suction cups 23, 2 of the bag feeding apparatus 2
3 are provided at the front and rear facing positions one by one, and the bag mouth 7
It is designed to adsorb and hold one part on the longitudinal coaxial line. Also, the bag 7 used in this type of automatic packaging device 1
As shown in FIG. 3 and FIG. 4, gussets (folds) 73, 73 are formed on the left and right side portions, respectively. In such a gusseted bag 7, when the bag mouth 71 is opened, the gussets 73, 73 in the vicinity of the bag mouth are greatly expanded.

Further, in the bag feeding device 2, the front and rear outer surfaces of the bag 7 are sucked by the suction cups 23, while the bag 7 is raised upright.
Since the bag 7 holds only the central portion in the left-right direction (only the sucker portions) when sucked by 23, the left and right end portions of the bag are in a free state. When wind pressure is applied to the side surface, as shown in FIG. 5, the portions of the bag mouth 71 near the left and right ends may be largely bent in the front-rear direction in a plan view.

[0008]

However, in the bag feeding device 2 of the above-mentioned conventional automatic packaging apparatus, the suction cups 23, 23 are not used.
When the front and rear outer surfaces of the bag mouth 71 are adsorbed by, when the left and right end portions 72, 72 of the bag mouth 71 are largely bent in the front-rear direction as shown in FIG. When the bag mouth 71 is opened by retreating, the bag mouth 71 is not evenly opened in the front-rear direction, and a part of the bag mouth 71 is denoted by reference numeral 7 in FIG.
As shown by 1 ', the chute 3 may be located inward of the outer peripheral surface, and in that case, there is a problem that the bag mouth 71 cannot be normally covered on the chute 3. .

In the conventional bag feeding device 2, when the bag 7 held in the vertical posture by the posture changing device 12 is received by the pair of front and rear suction cups 23, and is moved upward, the suction cups 23 are sucked up. , 23 are located on the coaxial line in the front-rear direction, the bag 7 easily swings to the left or right around the suction part. When the bag 7 is mounted on the chute 3 with the bag 7 swinging left and right in this way, the bag mouth portion is clamped in a tilted state, and is clamped by the weight of the raw material filled in the bag. There is a problem that uneven pulling force is generated in the bag mouth portion (a part of the bag mouth portion is partially tensioned and causes bag breakage). Also, the bag mouth 71
When covering the lower outer circumference of the chute 3, the bag mouth 71
However, when the bag mouth 71 is covered with the chute 3, the left and right ends 72, 72 of the bag mouth are opened.
Is widely spread back and forth. Especially when a bag with gusset is used, as shown in FIG.
The 3,73 part will be stretched back and forth. Then, next, each clamp member 5 of the end clamp devices 5, 5
Since the left and right end portions 72, 72 of the bag mouth are greatly stretched when the 2, 2 are closed (rotated in an arc downward), the clamp members 52, 52 are respectively moved to the bag mouth end portion 72. The upper edge of the bag is pressed downward, and in some cases, the bag mouth end 72 may not be folded properly at the original fold. That is, there is a problem in that the bag mouth end portion 72 is clamped in a folded state at a place other than the regular fold line.

In view of the above-mentioned problems of the conventional bag feeding apparatus, the present invention can surely open the bag mouth larger than the outer shape of the chute, and when the bag is mounted on the chute, the bag swings right and left. An object of the present invention is to make it harder and to make it possible to accurately clamp the left and right ends of the bag mouth with the end clamp device in a state of being properly folded at the regular folds.

[0011]

The present invention uses a bag with gussets in which gussets are formed at the left and right ends, respectively.
The raw material charging chute is provided with a pair of end clamp devices for holding each gusset portion of the bag mouth covered on the outer periphery of the lower part of the chute and a main clamp device for holding the left and right intermediate parts of the bag mouth, Inside the bag, the chute is sequentially moved between a bag feeding position where the gusseted bag is mounted on the chute, a filling position where the bag is filled with the raw material, and a removal position where the bag containing the raw material is removed from the chute. In a bag feeding device used in an automatic packaging device capable of automatically containing a fixed amount of raw material, a bag mouth of a gusseted bag in a closed state below the chute at the bag feeding position is provided on each of the front and rear sides. And a bag mouth opening means capable of adsorbing and holding them by suction cups and separating the suction cups from each other so that the bag mouth can be opened larger than the outer shape of the chute. Elevating means for vertically moving the bag mouth held by each suction cup below the lower end of the chute and the upper mounting height at which the bag mouth covers the outer circumference of the lower part of the chute;・ The outer surfaces of the left and right gussets in the vicinity of the bag mouth, which are moved back and forth in the separating direction and moved up and down together with the bag mouth opening means, are elastically attached from the front and rear sides toward the respective directions. In addition to a pair of elastic biasing means for biasing and the air bag opening means, an air cylinder for moving the elastic biasing means forward and backward in the approaching and separating directions is provided, and the air cylinder shoots the bag mouth. The elastic urging means are moved to the proximity side before the closing operation of the respective end clamp devices in the state of being covered with the shoe, while the elastic urging means is operated by the shoe to which the bag is attached. There has been characterized by being pressed into the bag and as may be retracted outwardly when exiting the filling position side from the bag feeding position.

[0012]

In the bag feeding apparatus of the present invention, below the chute at the bag feeding position, the bag mouth opening means opens the bag mouth, and then the bag mouth opening means moves up and down together with the bag, You can cover the bottom of the chute with the bag mouth. Then, when the bag mouth is put on the outer periphery of the lower part of the chute, first, the air urging means for advancing and retracting the respective elastic urging means actuate the respective elastic urging means in the mutually approaching direction to oppose each other. Clamp each gusset portion of the bag at each end. After that, each end clamp device is operated to clamp the left and right ends of the bag mouth, and then the main clamp device is operated to clamp the bag mouth to the outer surface of the chute over the entire circumference.

By the way, when the bag mouth is sucked from the front and rear sides by the suction cups of the bag mouth opening means, the left and right ends of the bag mouth are clamped by the front and rear elastic biasing means from the front and rear sides, respectively. . Therefore, even if the left and right ends of the bag mouth are largely bent in the front-rear direction before being sucked by the suction cup, the bag mouth is stretched linearly by being clamped by the elastic biasing means in the front and rear. Will be When the bag mouth is linearly extended at the time of suction by the suction cup in this way, the bag mouth is opened evenly in the front and back during the next bag mouth opening operation, and the bag mouth is opened larger than the outer shape of the chute. The outer circumference of the lower part of the chute can be reliably covered. Further, when the bag mouth is opened by the bag mouth opening means, the left and right ends of the front and rear elastic biasing means are elastically biased to the outer surfaces near the left and right ends near the bag mouth, respectively. Therefore, when the bag mouth is open, the middle portion of the bag mouth in the left-right direction is held by the suction cups, and the left and right end portions of the bag mouth are elastically biased by the elastic biasing means. Three points are supported from each side. In this way, when the bag is supported at three points from the front and back sides, the bag is less likely to swing to the left and right. Also, in this state,
Each of the elastic biasing means is moved outwardly, and a considerable space is formed between the corresponding ends of the gusset portions of the bag of the both elastic biasing means. Therefore, in this state, each gusset portion of the bag mouth may be opened considerably wide, and if the end clamp device is closed as it is, the gusset portion may not be normally grasped. However, in the present application, before the closing operation of the end clamp device, the elastic urging means are actuated toward each other by the air cylinder, so that the gusset portions are compressed from the front and the rear to be thin. Therefore, each gusset portion of the bag mouth can be held in a normal state by the closing operation of the end clamp device performed thereafter.

Further, the elastic urging means is adapted so that when the chute with the bag is withdrawn from the bag feeding position to the filling position side, the chute with the bag can be pushed outward by the bag and retracted to the outside. Even if the space between the biasing means is smaller than the front-back thickness of the bag, the chute with the bag is not hindered from moving.

[0015]

The bag feeding apparatus of the present invention has the following effects.

(1) Before the suction by the suction cups of the bag mouth opening means, even if the left and right ends of the bag mouth are largely bent in the front-back direction, the suction cups suck the bag mouth from the front and back sides. Since the bag mouth can be linearly extended by the front and rear elastic biasing means, the bag mouth can be opened evenly in the front and rear and in a state larger than the outer shape of the chute by the next bag mouth opening operation. As a result, the bag mouth can be accurately covered on the outer circumference of the lower part of the chute (the bag is not attached incorrectly).

(2) When the bag mouth is open, the elastic biasing means elastically biases the outer surfaces of the bag mouth near the left and right ends from the front and rear sides (from the front and rear sides of the bag). Since each bag is supported at three points), the bag is less likely to swing to the left and right, and the bag can always be attached to the chute in a normal posture (non-inclined posture).

(3) After the bag mouth is put on the chute and before the end clamp device is actuated, the elastic biasing means are actuated in the air cylinder in a direction to bring them closer to each other. Each gusset part of the bag mouth is compressed from the front and back to reduce its thickness, and the closing operation of each end clamp device that is performed thereafter keeps each gusset part of the bag mouth in a normal state (correct creases are correct). It can be clamped when folded.

(4) When the chute retreats from the bag supply position to the filling position side, the elastic biasing means is pressed by the bag and retracts outward, so that the elastic biasing means is provided. Even if it is a thing, it can be applied to a chute circulation type automatic packaging device.

[0020]

EXAMPLE An example of the present invention will be described with reference to FIGS. 6 to 12. The bag feeding device of this example is installed at the bag feeding position A of the automatic packaging device 1 shown in FIG. An embodiment of the present invention will be described with reference to FIG. The automatic wrapping apparatus 1 shown in FIG. 1 has been described in the section of the conventional art, and the description of the automatic wrapping apparatus 1 uses the description of the section of the conventional art in order to avoid redundant description.

Bag feeding device 2 of the embodiment shown in FIGS.
Is the elastic urging means 4 in the conventional bag feeding device shown in FIGS.
0 and 40 are added. That is, the bag feeding device 2
The gusseted bag 7 as shown in FIGS.
Feeding roller 10 for feeding sheets onto the inclined pedestal 11 one by one
And a posture changing device 12 for holding the bag 7 on the inclined pedestal 11 in a vertical posture immediately below the chute 3 at the bag feeding position A,
The bag mouth 7 of the bag 7 which is closed below the chute 3.
The bag mouth opening means 20 for opening 1 larger than the outer shape of the chute 3, the elevating means 30 for vertically moving the bag mouth opening means 20, and the outer surfaces of the opened bag mouth 71 near the left and right ends respectively. A pair of elastic urging means 40, 40 for elastically urging from the side in a direction approaching each other,
Apart from the bag mouth opening means 20, each elastic biasing means 40, 4
It is provided with a pair of air cylinders 44, 44 that move 0 to move toward and away from each other. The supply roller 10, the tilt pedestal 11, and the posture changing device 12 are the same as those of the conventional example shown in FIG. 2, and the bag 7 supplied on the tilt pedestal 11 by the supply roller 10 is used. Is
The posture changing device 12 holds the chute 3 in a vertical posture just below the chute 3.

The bag mouth opening means 20 has a pair of front and rear suction cups 23, 23 capable of sucking the bag mouth 71 of the bag 7 from front and rear sides by vacuum suction, and the suction cups 23, 23 close to each other.
The drive device 21 is operated to move back and forth in the separating direction.
In this embodiment, an air cylinder is used as the drive device 21, and this drive device will be referred to as an air cylinder in the following description. Further, the air cylinder 21 has a base plate 24.
Installed on top.

Each of the suction cups 23, 23 has an arm 2
The front end portions of the reference numerals 2 and 22 are attached so as to face each other. And each arm 2 with the air cylinder 21
The suction cups 23, 23 can be moved back and forth in the approaching / separating direction by moving the suction cups 23, 23 close to or away from each other. In addition, in the state where the air cylinder 21 is maximally extended (the state shown by the solid line in FIG. 7), each suction cup 2
A state in which the suction cups 23, 23 can almost contact each other in a state in which the space between the suction cups 3, 23 is slightly larger than the outer diameter of the chute 3 and the air cylinder 21 is maximally contracted (the state shown by the chain line in FIG. 7). It is close to.

In this embodiment, the elevating means 30 is provided with an elevating table 33 attached to two chains 32, 32 which are vertically moved by a motor (servo motor) 31, and further the elevating table 33 and the bag mouth opening means. The base plate 24 of 20 is connected by a connecting member 34. The motor 31 is capable of rotating in both forward and reverse directions and stopping the elevating table 33 at three positions of an upper stage position, a middle stage position and a lower stage position. When the lift table 33 is in the upper position, the suction cup of the bag mouth opening means 20 is located at the bag mouth mounting height H ₂ shown by reference numeral 23c in FIG. 6, and when the lift table 33 is in the middle position, the suction cup is the reference numeral. Intermediate standby height H ₀ indicated by 23
And the suction cup is located at the bag mouth receiving height H ₁ shown by the reference numeral 23a (or 23b) when the lifting platform 33 is at the lower position.

The elastic biasing means 40 are used as a pair of front and rear. Further, in this embodiment, a leaf spring 41 having an appropriate length in the left-right direction is used as the elastic biasing means 40.
The leaf springs 41, 41 have arms 22, 22 respectively.
It is attached to each of the air cylinders 44, 44 provided at the tip of the. The air cylinders 44, 44 are attached to the suction cups 23,
At a position immediately below 23, the movable sides (the telescopic rod side) are attached so as to face each other. The leaf springs 41, 41 are fixed to the movable portions of the air cylinders 44, 44 at the intermediate positions in the length direction. The air cylinders 44, 44 are provided separately from the bag mouth opening means 20 (air cylinder 21).
1 is moved back and forth in the approaching / separating direction. or,
In the natural state, the left and right spring pieces 42, 42 of the leaf spring 41 are respectively extended obliquely forward and outward (at an angle of about 45 °). When the arms 22 and 22 are separated from each other, as shown by the solid lines in FIGS.
The spring pieces 42, 42, ... Are arranged so as to form a substantially square shape, and the chute 3 can be housed in each spring piece 42, 42 ,. Each of the spring pieces 42, 42 ... Can be flexed in the front-back direction, and when a pressing force of a predetermined pressure or more is applied to the spring piece 42 from the inside, the spring piece 42 is freely moved to the outside. It is designed to bend. For example, when the arms 22, 22 are close to each other as shown by the chain line in FIG. 7 (the spring piece 42 is pressed against the bag), or when the chute with bag is retracted from the bag feeding position as shown in FIG. 10 ( The bag 7a presses the spring piece 42) and the like.
Are freely bent outward as indicated by reference numeral 42a (FIGS. 7 and 10).

Further, in this bag feeding device 2, each arm 22,
When the air cylinders 22 and 22 are in the separated state and the air cylinders 44 and 44 are in the contracted state, as shown in FIG. 10 or 11, an appropriate interval (for example, 40 to 80 mm) is provided between the tips of the spring pieces 42 and 42 facing each other. ) Is formed.
Further, when the air cylinders 44, 44 are extended from the separated state of the leaf springs 41, 41, the spring pieces 42, 42 ,. In the direction close to each other, and at that time, at the facing ends of the spring pieces 42, 42 ...
Are compressed to a substantially completely folded state as indicated by reference numeral 72a. In this embodiment, the leaf spring 41 is used as the elastic biasing means 40, but in another embodiment, the elastically biasing means 40 biases the inflexible rod-shaped body inward by the spring. You may use what was made to do.

Next, the operation of the bag feeding device 2 of this embodiment will be described. In this embodiment, as the bag 7, a bag with gussets having gussets 73, 73 formed on the front and rear sides is used.

The bag 7 has a supply roller 10 as shown in FIG.
Are sequentially supplied one by one onto the inclined pedestal 11, and the bag 7 on the inclined pedestal 11 is further held by the posture changing device 12 in a standing posture up to the vertical posture indicated by reference numeral 7a.

Next, the motor 31 of the elevating means 30 operates downward so that the suction cups 23, 23 at the intermediate standby height H ₀ are moved down to the bag mouth receiving height H ₁ , and then the air cylinder. 21 shrinks to bring the suction cups located at the reference numeral 23a closer to the position shown at the reference numeral 23b, and vacuum suction is performed there to suck the front and rear outer surfaces of the bag mouth 71 by the suction cups 23b and 23b. At this time, the spring pieces 42, 42, ... Of the elastic biasing means 40, 40 are bent outward as indicated by the reference numeral 42a in FIG. 7 to hold the bag mouth 71 in a straight line. Before the suction of the bag mouth 71 by the suction cups 23, 23, the left and right ends 72, 72 of the bag mouth 71 may be largely bent in the front-rear direction. Even if the ends 72, 72 are bent in the front-back direction,
Since the arms 22, 22 of the bag mouth opening means 20 approach each other, the bag mouth 7 is moved by the front and rear elastic biasing means 40, 40.
1 will be extended linearly. At this time, the air cylinder 4 for individually moving the leaf springs 41, 41 back and forth.
4 and 44 are still in the reduced state.

Next, the air cylinder 21 is extended and the suction cups 23, 23 are retracted to the spaced position 23a while suctioning and holding the outer surfaces of the bag mouth 71. In this state,
As shown in FIG. 10, the front end portions of the spring pieces 42, 42, ... Are in proper pressure contact with the left and right end portions 72, 72 of the bag mouth 71 from the front and rear sides, respectively. The bag 7 is supported at three points from each of the front and rear sides by suction / holding and pressure contact of the spring pieces 42, 42.
Therefore, the bag 7 will not be carelessly displaced or shaken to the left or right. Further, at the time of this bag mouth opening operation, since the bag mouth 71 is released from the state in which it is linearly extended by the front and rear elastic biasing means 40, 40, the bag mouth 71 is opened evenly in the front and rear. Therefore, immediately below the chute 3, the chute 3 is surely opened larger than the outer circumference of the lower part thereof.

Subsequently, the motor 31 of the elevating means 30 operates upward so that the suction cups 23, 23 are sucked by the bag mouth 71, and the intermediate standby height H ₀ is passed to the bag mouth mounting height H _2. Then, the bag mouth 71 is put on the outer circumference of the lower portion of the chute 3 (Fig. 9).
reference). In this state, as shown in FIGS. 9 and 10,
The vicinity of the left and right ends 72, 72 of the bag mouth 71 is lightly pressed from the front and rear sides by the portions near the tips of the spring pieces 42, 42 ,. It is regulated to spread to people.

Next, immediately after the bag mouth 71 is covered on the outer periphery of the lower portion of the chute 3 (before the closing operation of the end clamp devices 5 and 5), the air cylinders 44 and 44 for advancing and retracting the leaf spring extend,
The left and right end portions 72, 72 of the bag mouth 71 are compressed from the front and rear sides by the respective tip portions of the opposing spring pieces 42, 42 (the bag mouth end portion is in the front-back direction as indicated by reference numeral 72a in FIG. 11). Thin).

Next, the air cylinders 51 of the end clamp devices 5 and 5 are extended to form the front and rear clamp members 52 and 52.
Is rotated downward in an arc. At this time, the left and right ends 72, 72 of the bag mouth 71 are sandwiched by the opposite ends of the leaf springs 41, 41, and the gusset portion is thin, so that the bag is formed by the end clamp devices 5, 5. When the mouth end is clamped, the clamping members 52, 52 hardly push down the upper edge of the bag mouth, so that the left and right ends 72, 72 of the bag mouth are correctly folded at regular folds. It will be clamped in the wrapped state. Note that the suction action of the suction cups 23, 23 is stopped at substantially the same time as (or slightly after) the extension operation of the air cylinder 51, and the air cylinders 44, 44 for the leaf spring advancing / retracting operation are contracted to reduce the bag mouth. 71 is transferred to the end clamp devices 5 and 5 side.

Next, the lifting means 30 is used to suck the suckers 23, 23.
Is moved down to the position of the intermediate standby height H ₀ , the air cylinders 61, 61 of the main clamp device 6 are extended,
The bag mouth 71 portion is strongly clamped to the outer peripheral surface of the chute 3 over the entire circumference (state of FIG. 12). In this state, the work of mounting the bag 7 on the chute 3 is completed, and then the bag-mounted chute 3 is withdrawn from the bag feeding position A to the filling position B side. At this time, as shown in FIG. 10, the bag (reference numeral 7a) attached to the chute 3 is used for the spring pieces (reference numerals 42a, 42).
While deflecting a) outward, the bagged chute 3a passes between the spring pieces outward (toward the filling position B). It should be noted that at each of the positions A to F in FIG. 1, a predetermined operation is performed, and the raw material packaging operation is sequentially performed.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a conventional automatic packaging device.

FIG. 2 is a side view of a bag feeding device used in the automatic packaging device of FIG.

FIG. 3 is a partially enlarged view showing an operation change state of the bag feeding device of FIG.

4 is a view corresponding to a cross section taken along the line IV-IV of FIG. 3.

FIG. 5 is a modification of FIG.

FIG. 6 is a side view of the bag feeding device according to the embodiment of the present invention.

FIG. 7 is a plan view of FIG.

FIG. 8 is a perspective view of the bag feeding device of FIG.

9 is a partially enlarged view showing an operation change state of the bag feeding device of FIG.

10 is a view corresponding to a section taken along line XX of FIG. 9.

11 is a state change diagram of FIG.

12 is a state change diagram of FIG.

[Explanation of symbols]

1 is an automatic packaging device, 2 is a bag feeding device, 3 is a chute, 5 is an end clamp device, 6 is a main clamp device, 7 is a bag (bag with gusset), 20 is a bag mouth opening means, 21 is an air cylinder, 23 is a suction cup, 30 is a lifting means, 40 is an elastic biasing means, 41 is a leaf spring, 42 is a spring piece, 44 is an air cylinder, 71 is a bag mouth, 72 is an end, 73 is a gusset, A is a bag feeding position. , B to D are filling positions.

Claims (1)

[Claims] 1. A left and right end portions (72, 72) are respectively fitted with a gutter.
Gusseted bag (7) forming a set (73, 73)
To the raw material charging chute (3)
Each gusset of the bag mouth (71) covered on the lower outer periphery of (3)
A pair of end clamp devices for holding the (73,73) portion
Holds the left and right intermediate portions of (5, 5) and the bag mouth (71)
A main clamp device (6) is provided, the chute (3) is further provided, a bag feeding position (A) at which the gusseted bag (7) is mounted on the chute (3), and filling for filling raw materials into the bag. By sequentially moving between the positions (B to D) and the removal position (F) for removing the raw material-containing bag from the chute (3), the raw material can be automatically accommodated in a fixed amount in the bag (7). In the automatic packaging apparatus, a bag feeding device for mounting the bag (7) on the chute (3) at the bag feeding position (A), below the chute (3) at the bag feeding position (A). Mouth (71) of the gusseted bag (7) closed at
Can be adsorbed and held by suction cups (23, 23) from the front and rear sides respectively, and by separating the suction cups (23, 23) from each other, the bag mouth (71) is opened larger than the outer shape of the chute (3). Bag mouth opening means (2)
0) and the bag mouth opening means (20) for each suction cup (23, 2).
(3) An elevating means for vertically moving the bag mouth (71) held by the bag mouth (71) below a lower end of the chute and an upper mounting height at which the bag mouth (71) covers the lower outer periphery of the chute. 30) and the suction cups (23, 23)
Also, the outer surfaces of the left and right gusset portions near the bag mouth (71), which is moved forward and backward in the approaching / separating direction and is moved up and down together with the bag mouth opening means (20), are close to each other from the front and back sides. A pair of elastic urging means (40, 40) for elastically urging in a direction,
Separately from the bag mouth opening means (20), each elastic biasing means
Move (40, 40) back and forth in the direction of approaching and separating from each other.
And an air cylinder (44, 44) for closing the bag mouth (71).
Each end clamp device in a state of being covered with a kit (3)
Before the closing operation of (5, 5), each elastic biasing means (40, 4)
0) is moved to the close side, while the elastic biasing means (40, 40) causes the chute (3) to which the bag (7) is attached to withdraw from the bag feeding position (A) to the filling position (B) side. A bag feeding device for an automatic packaging device, wherein the bag is pushed by the bag (7) so as to be able to be retracted outward when the bag is processed.