JP2712005B2 - Grip device for 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 a gripping device for a packaging machine for packaging white rice, beans and the like.

[0002]

2. Description of the Related Art A packaging device for packaging white rice and the like is disclosed in
It is known from Japanese Patent No. -20899, and the handling of the bag disclosed therein is such that the opening of the bag made by the bag making device is gripped by the holding portion and the bag is rotated as it is and white rice is charged. It is set on the chute mechanism. And
The holding portion holds and holds the same bag until the bag is filled with a predetermined amount of white rice, the bag mouth is sealed, and the bag filling is completed.

[0003]

Further, a rotary type packaging machine in which both side edges of a bag are bitten by a pair of biting arms composed of an inner nail and an outer nail provided on an intermittent rotating disk is disclosed in Japanese Unexamined Utility Model Publication No. H10-204,197. No. 47048. In this packaging machine, bags supplied from a bag supply device are sequentially grasped by a large number of engaging arms projecting in a radial direction, and the bags are transferred to each process. The interval between the bite arms is adjusted by manually rotating a screw having a different thread cutting direction according to the size of the bag.

[0004] In the former packaging apparatus, the bags are restrained until a series of operations of setting the bags once and filling the bags and transferring the bags to the conveyor is completed. Can not be supplied. For this reason, in this apparatus, a series of steps from filling to discharge takes time, and the work cannot be performed quickly.
Also, in the latter packaging machine, every time the size of the bag is changed, the operator must manually adjust the interval between the bite arms, and sometimes the content is reduced in order to shorten the filling time. Replacement work, such as enlarging the funnel for filling with, was required.

Accordingly, it is an object of the present invention to sequentially carry out bag-filling steps while repeating the operation of grasping or releasing both side edges of a bag in a vertical position with the opening upward by the first and second grips. Another object of the present invention is to provide a grip device configured to efficiently transfer a new bag and automatically adjust the grip interval according to the sizes of multiple types of bags.

[0006]

In order to achieve the above object, according to the present invention, a machine base is provided on a pair of rails fixed inside a machine frame so as to freely advance and retreat, and the machine base is mounted on the machine base. Each pair of short rails is provided at a predetermined interval in a direction orthogonal to the rails, and a pair of first grip and second grip for grasping or releasing both side edges of the bag in a vertical position with the opening upward. A base plate provided on the short rail so as to freely move forward and backward, and a sub-grip for gripping both side edges of the bag together with the first grip or the second grip at the time of filling of the article to be packaged, freely moving forward and backward in the same direction as the short rail. The first grip is provided at a first position and a second position, and the second grip is provided at a second position and a third position by intermittently transferring the machine by a driving means. The first grip and the second By moving the grip and secondary grip, characterized in that it constitutes the intervals of the grip so as to adjust in response to the size of the double type of bag.

According to a second aspect of the present invention, there is provided a gripping device for a packaging machine according to the first aspect of the invention, wherein the bag width adjusting means is supported by a pair of swingably supported inside the machine frame. Are connected by a rod, the lower ends of the levers are connected to the base plates respectively inserted between the first grip and the second grip, and the rod of the air cylinder attached to the machine frame is connected to one side. Are connected to one end of the lever, and the operation of the cylinder swings the lever to move the two base plates toward or away from each other.

[0008] The air cylinder according to claim 2 is optimally constituted by connecting two air cylinders (claim 3).

According to a fourth aspect of the present invention, there is provided a gripping device for a packaging machine, wherein the bag width adjusting means is swingably supported inside a machine frame. A pair of levers are connected by a rod, a tip end of each of the levers is connected to a base plate which is respectively extended to a first grip and a second grip, and a slider is connected to a screw rod rotatably supported by the machine frame. And the slider and one end of one lever are connected by a rod, and the screw rod is rotated by a servomotor to swing the lever to move the two base plates closer or apart. It is characterized by the following.

[0010]

The operation of the gripping device of the packaging machine according to the first aspect will be described with reference to the packaging machine. In the packaging machine, the bags supplied in a horizontal position from the bag-making mechanism in the previous process are set in a vertical position with the opening upward by the reversing mechanism. In the first position I, when the first grip grips both side edges of the bag, the machine is moved forward and the bag is transferred to the second position II by the driving means driven by the control program of the packaging machine. In the second position II, when the sub-grip grips the side edge of the bag together with the first grip, the filling means starts to fill the bag with the contents. During the filling, only the first grip is opened with the auxiliary grip gripping the bag, and the first grip returns to the first position I after the machine is retracted by the driving means. At the same time, the second grip returns from the third position III to the second position II, and grasps the bag being filled again. Next, when the filling is completed, while the second grip holds the bag, the machine advances again by the driving means to transfer the bag to the third position III. In the third position III, the second grip releases the bag and returns to the second position II while the opening of the bag is sealed. At the same time, the first grip is moved from the second position II to the first position.
Return to I. Thus, the device of the present invention repeats the operation of grasping or releasing the side edges of the bag in the vertical position with the opening upward by the first grip and the second grip,
New bags are efficiently transferred one after another to each step of bag filling.

When changing the size of the bag, a predetermined input is made to an operation unit (not shown) of the packaging machine, and the rod of the air cylinder of the bag width adjusting means is operated to expand and contract according to a command of a control program. When the lever connected to the rod is swung by the operation of the cylinder, the first grip and the second grip are moved.
The base plate to which the grip is indirectly fixed is relatively approached or separated. As a result, the distance between the first grip, the second grip, and the auxiliary grip is automatically adjusted in accordance with the bag size set by the input operation (claims 1 to 3). In addition to the cylinder size change by the cylinder method, the same adjustment operation can be performed by a configuration in which the lever is swung by a screw feed mechanism by a servomotor (claim 4).

[0012]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a side view showing the entire packaging machine provided with the grip device, FIG. 2 is a plan view schematically showing the grip device, FIG. 3 is a side view taken along line BB of FIG.
FIG. 4 is a sectional view taken along line AA of FIG. 2, FIG. 5 is a perspective view of the device,
6 is a perspective view of a main part, FIG. 7 is a perspective view of an adjusting means, FIG. 8 is a side view showing another embodiment of the adjusting means, and FIG. 9 is an explanatory view showing the operation of an air cylinder used for the adjusting means. 10 is a front view of a driving means by a cam mechanism, FIG. 11 is a side view of a mechanism for controlling opening and closing of a grip, FIG. 12 is a front view of a sub grip, and FIG. 13 shows an arrangement of a second grip and a third grip. FIG. 14 is a schematic view as viewed from the direction of arrow C in FIG.

FIG. 1 shows an outline of a packaging machine 200 to which the grip device G of the present invention is applied. The packaging machine 200
A bag making mechanism 210 for making a bag b from a film f, and a reversing mechanism 22 for putting the bag b in a horizontal position vertically with its opening upward.
0, a filling means 230 for charging the contents, a heat sealing means 250 for sealing the opening, an unloading means 260, and the like. As shown in FIGS. 4 and 5, brackets 1 and 1a are mounted inside the machine frame 201 of the packaging machine 200, and a pair of long rails 3 and 3a are fixed to the distal ends 2 and 2a of the brackets 1 and 1a. Sliding members 4, 4 on rails 3, 3a
Then, the side plates 6, 6a of the machine base 5 are fixed on the sliding members 4, 4a. The machine base 5 is integrated by inserting and fixing the frame plate 7 to the tops of brackets 16 and 16a described later provided on the side plates 6 and 6a. As shown in FIG. 2, a drive pin 8 is attached to the side plate 6 on the right side in the traveling direction of the bag, and one end of a rod 9 is connected to the tip thereof. As shown in FIG. 10, the other end of the rod 9 is connected to the tip piece 11 of the feed lever 10. The feed lever 10 contacts the cam followers 12 and 13 with a cam 203 fixed to a drive shaft 202 which is driven and controlled by a control program of the packaging machine 200,
4 is supported swingably. The structure for intermittently transferring the machine base 5 by these series of cam mechanisms is an example of the driving means D of the present invention.

On the machine base 5, the rotating shaft 15 is mounted on the bracket 1.
The rotary shaft 15 is rotatably supported at 6, 16a, and a lever 17 is fixed to one end of the rotary shaft 15. The lever 17 has a tip 18 at the side piece 20 of a ¬-shaped arm 19 which moves up and down by rotation of a cam 204 fixed to the drive shaft 202.
Are mounted to be moved horizontally. 21,
22 is a guide for the ア ー ム -shaped arm 19. As shown in FIG. 3, a gear 23 is fixed to the rotating shaft 15, and a small gear 24 meshing with the gear 23 is rotatably supported by the brackets 16, 16a. Reference numeral 25 denotes a lever fixed to the side surface of the small gear 24.

On each side plate 6, 6a of the machine base 5,
A pair of short rails 26 and short rails 27 are provided in a direction perpendicular to the rails 3 and 3a at a predetermined interval (that is, a distance between the first position I and the second position II). Short rail 26,2
7, the sliding members 28 and 29 are loosely fitted, respectively, and the bases 30 and 31 are fixed on the sliding members 28 and 29, respectively. As shown in FIG. 2 and FIG.
A pair of first grips 35 for gripping or releasing both side edges of the opened bag b are provided. A pair of gears 36 rotatably provided on the base 30 is meshed with the first grip 35, and grip pieces 37, 37a each having a long portion for holding the bag b are fixed to each gear 36, and one of the grip pieces is fixed. 37
The cam follower 39 is erected on the arm 38 formed in the above. The cam follower 39 is engaged with a cam groove 41 formed in the cam plate 40. Similarly, a pair of second grips 45 for grasping or releasing both side edges of the opened bag b are provided at the distal end on the base 31. A pair of gears 46 rotatably provided on the base 31 is meshed with the second grip 45, and grip pieces 47, 47a each having a long portion for holding the bag b are fixed to each gear 46, and one of the grip pieces is fixed. A cam follower 49 is erected on an arm 48 formed at 47. The cam follower 49 is engaged with the cam groove 51 formed on the cam plate 50.

The cam plates 40 and 50 and the holder 52 disposed therebetween are mounted on a sliding member 53. The guide rail 54, into which the sliding member 53 is fitted so as to be able to move forward and backward, is parallel to the rails 3, 3a.
a are respectively fixed to the lower surface. As shown in FIG. 2, one end of the rod 56 is connected to a pin 52a projecting inward from the holder 52, and the other end is connected to the lever 25. A horizontal shaft 57 is fixed to the holder 52, and one of the horizontal shafts 57 is connected to the projecting piece 4 on the cam plate 40 via a spring 58.
0a. Also, the other is a projection 50 on the cam plate 50.
The spring 59 is attached by loosely fitting to a. As a result, the grip pieces 37, 37a and the grip pieces 47, 47a are elastically pressed by the springs 58, 59, respectively. On the base plates 55, 55a, a pair of sliding members 60, 61 are provided at predetermined intervals with the rails 26, 2a.
Install in the same direction as 7. And the sliding member 60,
Guide rails 62 and 63 that fit freely into and out of 61
Brackets 64, 64a attached inside machine frame 201
Is fixed to the lower surface. Further, a cam follower 65 is fixed vertically on the upper surface of the base 30, and the base plates 55, 55
The cam follower 65 is loosely fitted to the guide piece 66 attached to the lower surface of the section a. Similarly, a cam follower 67 is fixed vertically on the outer upper surface of the base 31, and the base plates 55, 5
The cam follower 67 is loosely fitted to the guide piece 68 attached to the lower surface of 5a.

As shown in FIGS.
above the pair of bearing brackets 7 on the machine frame 201.
The rotating shaft 72 is horizontally supported by attaching 0 and 71 at intervals. The levers 73 and 74 are fixed inside each rotation shaft 72, and the lower ends of the levers 73 and 74 are connected to links 75 and 7 respectively.
6 to the base plates 55, 55a. One end of the rod 77 is connected to a position above the rotation shaft 72 of one lever 74, and the other end is connected to a position below the rotation shaft 72 of the other lever 74. The two air cylinders 78 and 79 are connected on the head side to be integrated, one rod 78a is connected to a horizontal rod 80 protruding from the outer surface of the machine frame 201, and the other rod 79
a is connected to one end of the one lever 74. Thus, the levers 74, 73 are operated by the operation of the cylinders 78, 79.
Is rocked so that the base plates 55 and 55a are approached or separated from each other. As shown in FIG. 9, the air cylinders 78 and 79 can change the stroke s in four steps (a) to (d), and accordingly, the base plates 55 and 55a.
, That is, the intervals between the first grip 35, the second grip 45, and the later-described auxiliary grip 100 are automatically adjusted stepwise according to the size of the bag b. These series of structures show the air cylinder type bag width adjusting means T.

The bag width adjusting means T may be a screw feed mechanism using a servo motor 81 shown in FIG. That is, in this screw feed mechanism, a servo motor 81 is attached to a bracket 82 fixed to the outer surface of the machine frame 201, and an output shaft 83 of the motor 81 is connected to the coupling 8.
Screw rod 8 rotatably supported by machine frame 201 via
5. The screw rod 85 has a slider 86
The slider 86 and one end of one lever 87 (corresponding to the lever 74) are connected by a rod 88. Thus, the screw rod 8 is driven by the servo motor 81.
5 is rotated forward or backward to swing the lever 87,
5, 55a are moved closer to or away from each other,
Grip 35, second grip 45, and auxiliary grip 1 described below
Each interval of 00 can be adjusted automatically.

In order to prevent the upper part from shrinking inward as much as possible when opening the unpackaged bag b, as shown in FIGS. Slightly above, there is provided a pair of auxiliary clamps 90 with rollers for pinching or releasing the side edges of the bag b. The auxiliary clamp 90 has a block 9 fixed on the base plates 55 and 55a.
A rotating shaft 93 in which a pair of gears 92 are meshed with each other is rotatably supported, and rollers 94 that freely rotate in the horizontal direction are provided at the tip of the rotating shaft 93 so as to abut against each other. The rod 97 of the air cylinder 96 supported on the block 91 is connected to a lever 95 fixed to one gear 92.

As shown in FIGS. 5 and 12, at the second position II,
A pair of auxiliary grips 100 are provided slightly above the gripping portion of the second grip 45 to grip or release both side edges of the bag b. The auxiliary grip 100 rotatably supports a rotating shaft 103 in which a pair of gears 102 mesh with a block 101 fixed on the base plates 55 and 55a.
The arm 104 is fixed to the front end of the arm and is provided so that the lower ends thereof abut each other. A rod 107 of an air cylinder 106 supported on the side of the block 101 is connected to a lever 105 fixed to one gear 102.

Further, in order to transfer the completed bag b to the next process in a stable posture, the third position III is set in FIG.
As shown in FIGS. 3 and 14, a pair of third grips 110 for gripping or releasing both side edges of the bag b are provided a little below the gripping portion of the second grip 45. The third grip 110 includes a support rod 1 fixed to the lower surfaces of the side plates 6 and 6a.
A plate 112 is attached to the top surface of the distal end of 11, a pair of gears 113 rotatably provided on the plate 112 mesh with each other, and grip pieces 114, 114 a having a long portion for holding the bag b are fixed to each gear 113. I have. An arm 115 formed on one grip piece 114 has a rod 11
6 and one end of the rod 116 is connected to the cam plate 50 of the second grip 45. The third grip 110 is configured to open and close in synchronization with the first grip 35 and the second grip 45. The third grip 110 is in a fixed state without moving in the width direction of the bag b, even if the size of the bag b changes, only in a different gripping position.

The operation of the gripping device G of the packaging machine thus configured will be described with reference to the packaging machine 200. In the packaging machine 200, the unpackaged bag b supplied in a horizontal position from the bag-making mechanism 210 in the previous process is set in a vertical position with the opening part upward by the reversing mechanism 220. In the first position I, when both sides of the bag b are held by the rollers 94 of the auxiliary clamp 90, the upper portion of the bag a is sucked and opened by a vacuum suction cup (not shown). At this time, a guide piece (not shown) is inserted into the opening, and the lever 25 swings by the rotation of the gear 24 to pull the rod 56 and move the cam plate 40. As a result, the grip pieces 37 and 37a of the first grip 35 close and grip both side edges of the bag b, and then the auxiliary clamp 90 is opened.
In this state, the machine base 5 advances on the rails 3 and 3a by the swinging motion of the lever 10 which is driven and controlled by the control program of the packaging machine 200 and contacts the rotating cam 203, and the bag b
From the first position I to the second position II. In the second position II, when the arm 104 of the auxiliary grip 100 grips both side edges of the bag b together with the first grip 35, the contents are filled into the bag b by the filling means 230. During the filling, the grip pieces 37 and 37a of the first grip 35 are opened, the machine base 5 is retracted by the swinging motion of the lever 10, and the grip 35 returns to the first position I. At the same time, the second grip 45 returns from the third position III to the second position II, and the grip pieces 47, 47
The bag b being filled is gripped again by a.

When the filling is completed, the auxiliary grip 100
Arm 104 is opened to release the bag b. Then the second
With the grip 45 holding the bag b, the machine base 5 advances again by the driving means D, and the bag b is transferred to the third position III. In addition, bag b, which is packed and sealed,
It is transferred in the unloading direction by the third grip 110. In the third position III, while the opening of the bag b is sealed, the second grip 45 releases the bag b to release the second position II.
Return to At the same time, the first grip 35 also releases the bag b being filled, and returns from the second position II to the first position I. Similarly the third
The grip 110 is also released from the position where the bag b is released and advanced to the third position.
Return to position III. Then, the next bag is again held at the first position I by the auxiliary clamp 90, and the above-described series of operations is started. As described above, the device G of the present invention
With the grip 35 and the second grip 45, the operation of grasping or releasing both sides of the bag b in the vertical position with the opening part upward is sequentially repeated, and a new bag is efficiently and successively transferred to each step in which the bag is packed. What you do.

Next, the case where the size of the bag is changed will be described. In this embodiment, the object to be handled is 1 to 10 k
White rice or the like weighing about g is used, and the width of the bag used for this is about 190 to 370 mm. Operation unit (not shown)
When the bag size is input, the rods 7 of the air cylinders 78 and 79 of the adjusting means T are instructed by a command of the control program.
As shown in FIG. 9, 8a and 79a expand and contract as appropriate.
Taking the case of changing from the state (d) in the figure to the state (c) as an example, when the rod 78a of the cylinder 78 retracts and swings the lever 74 connected to the rod 79a counterclockwise, the base plate 55 , 55a relatively approach along the guide rails 62, 63. Accordingly, the first grip 3
5, since the second grip 45 and the auxiliary grip 100 also move on the short rails 26 and 27, the grips 35 and 45,
The 100 intervals are automatically adjusted according to the bag size. Further, the same adjustment operation can be performed by using a screw feed mechanism using the servomotor 81 instead of the adjustment means T using the air cylinder.

[0025]

The apparatus of the present invention has the above-described structure and operation. The first and second grips repeat the operation of grasping or releasing the side edges of the bag in the vertical position with the opening upward. New bags can be efficiently transferred one after another to each step of bag filling. Further, when changing the size of the bags, the distance between the grips is automatically adjusted in accordance with the size of each bag in accordance with an operation command from the operator. This eliminates the need for complicated adjustment work associated with the conventional bag size change, and has many excellent effects such as quick and easy response to the bag size change.

[Brief description of the drawings]

FIG. 1 is a side view showing an entire packaging machine provided with a grip device.

FIG. 2 is a plan view schematically showing a grip device.

FIG. 3 is a side view taken along the line BB of FIG. 2 with a part omitted.

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a perspective view of the device.

FIG. 6 is a perspective view of a main part.

FIG. 7 is a perspective view of an adjusting unit.

FIG. 8 is a side view showing another embodiment of the adjusting means.

FIG. 9 is an explanatory view showing the operation of an air cylinder used for the adjusting means.

FIG. 10 is a front view of driving means by a cam mechanism.

FIG. 11 is a side view of a mechanism for controlling opening and closing of a grip.

FIG. 12 is a front view of a sub grip.

FIG. 13 is a partially omitted plan view showing the arrangement of the second grip and the third grip.

FIG. 14 is a schematic diagram viewed from the direction of arrow C in FIG. 13;

[Explanation of symbols]

I → first position II → second position III → third position D → driving means G → grip device T → adjusting means a, b → bag f → film s → stroke 1,1a → bracket 2,2a → tip 3 , 3a →
Rail 4, 4a → Sliding member 5 → Machine base 6, 6a → Side plate 7 →
Frame plate 8 → drive pin 9 → rod 10 → feed lever 11 → tip piece 12,
13 → Cam follower 14 → Shaft 15 → Rotating shaft 16, 16a → Bracket
17 → lever 18 → tip 19 → ¬-shaped arm 20 → horizontal piece 21, 2
2 → guide 23 → gear 24 → small gear 25 → lever 26,27
→ Short rail 28,29 → Sliding member 30,31 → Base 35 → First grip 36 → Gear 37,37a → Grip piece 38 → Arm 39 → Cam follower 40 → Cam plate 40a → Protrusion piece
41 → Cam groove 45 → Second grip 46 → Gears 47, 47a → Grip piece 48 → Arm 49 → Cam follower 50 → Cam plate
50a → protruding piece 51 → cam groove 52 → holder 52a → pin 53 →
Sliding member 54 → guide rail 55, 55a → base plate 56 → rod 57 → horizontal shaft 58, 59 → spring 60, 61 → sliding member 62, 63
→ Guide rail 64, 64a → Bracket 65 → Cam follower 6
6 → guide piece 67 → cam follower 68 → guide piece 70, 71 →
Bearing bracket 72 → rotating shaft 73, 74 → lever 75, 76 → link 77 → rod 78 → air cylinder 78a → rod 79 → air cylinder 79a → rod 80 → horizontal rod 81 → servo motor 8
2 → Bracket 83 → Output shaft 84 → Coupling 85 → Screw rod 8
6 → Slider 87 → Lever 88 → Rod 90 → Auxiliary Clamp 91 → Block 92 → Gear 9
3 → Rotating shaft 94 → Roller 95 → Lever 96 → Air cylinder
97 → rod 100 → sub grip 101 → block 102 → gear 103 → rotating shaft 104 → arm 105 → lever 106 → air cylinder 107 → rod 110 → third grip 111 → support rod 112 → plate 113 → gear 114 → grip piece 114a → Grip piece 115 →
Arm 116 → Rod 200 → Packing machine 201 → Machine frame 202 → Drive shaft 20
3, 204 → cam 210 → bag making mechanism 220 → reversing mechanism 230 → filling means 250 → heat sealing means 260 → unloading means

Continuation of the front page (56) References JP-A-63-317420 (JP, A) JP-A-1-124737 (JP, A) JP-A-62-127912 (JP, U) JP-A-1-58411 (JP) , U) Japanese Utility Model Showa 62-77921 (JP, U)

Claims (4)

(57) [Claims] 1. A machine base is provided on a pair of rails fixed inside a machine frame so as to freely advance and retreat, and a pair of short rails are provided on the machine base at predetermined intervals in a direction orthogonal to the rails, A pair of first and second grips are provided on the short rail for grasping or releasing both side edges of the bag in a vertical position with the opening upward, and the first and second grips are provided freely on the short rail.
By providing a sub-grip for gripping both side edges of the bag together with the grip or the second grip on a base plate provided to be able to advance and retreat in the same direction as the short rail, by intermittently transferring the machine base by driving means. A first grip is provided at a first position and a second position, and a second grip is provided to advance and retreat at a second position and a third position.
By moving the second grip and the secondary grip,
A grip device for a packaging machine, wherein an interval between grips is adjusted in accordance with sizes of a plurality of types of bags. 2. A grip device for a packaging machine according to claim 1, wherein said bag width adjusting means connects a pair of levers which are swingably supported inside the machine frame by rods, and wherein a first grip and a second grip are provided. The lower end of each of the levers is connected to the base plate inserted between them, and the rod of the air cylinder attached to the machine frame is connected to one end of one of the levers. A grip device for a packaging machine, characterized in that the lever is swung to move the two base plates toward or away from each other. 3. A grip device for a packaging machine, wherein the air cylinder according to claim 2 is constituted by connecting two air cylinders. 4. A grip device for a packaging machine according to claim 1, wherein said bag width adjusting means connects a pair of levers, which are swingably supported inside the machine frame, by rods, and wherein the first grip and the second grip are connected. The leading end of each of the levers is connected to a base plate inserted into a grip, and a slider is screwed into a screw rod rotatably supported on the machine frame, and one end of the slider and one of the levers are connected to a rod. A gripping device for a packaging machine, wherein the lever is pivoted by rotating a screw rod by a servomotor to move the base plates closer to or away from each other.