JP2567872B2 - Gripping interval adjustment mechanism in bag mouth gripping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to, for example, a bag mouth gripping device of a rotary bag filling and packaging machine, in which a gap between a pair of clamps for gripping the bag mouth is a bag. The present invention relates to a gripping space adjustment mechanism that can be adjusted according to the width of a mouth.

(Prior Art) Conventionally, in this type of bag-filling packaging machine, a mechanism for adjusting a gripping interval according to the width of the bag and each packaging process (bag feeding,
(Opening the bag, supplying goods, sealing the bag mouth, discharging the bag, etc.)
And a mechanism for adjusting the gripping interval according to the above.

Particularly, as a mechanism for adjusting the gripping interval according to the width of the bag, there is a mechanism disclosed in Japanese Utility Model Publication No. 55-6326. In the mechanism disclosed here, as shown in the drawings of the publication,
When the lever handle is fitted to the mounting corner portion 35 and the opening adjustment shaft 34 is rotated in an arbitrary direction, the gear component plate 21 rotates on the outer periphery of the shaft support cylinder 1 and the feed screw is passed through the front gear 23 and the pinion 25. 24 rotates. When the feed screw 24 rotates, the nut 30 screwed to the feed screw 24 advances and retreats in the axial direction of the feed screw 24, the swing arm 8 and the shaft 7 rotate in the same direction, and the mounting protrusion 11 fixed to the shaft 7 The holding arm 16 and the sector gear 12 rotate in the same direction, and at the same time, the sector gear 15 rotatably supported by the adjacent support shafts 7 rotates by meshing with the sector gear 12, and the sector gear 15 is rotated. The mounting protrusion 14 and the holding arm 17 which are connected to each other rotate. Therefore, the two holding arms 16 and 17 are rotated in the directions toward and away from each other to adjust the distance between them.

(Problems to be Solved by the Invention) However, since the both holding arms 16 and 17 are rotated around the shaft 7 so that the distance between them is adjusted, the two holding arms 16 and 17 can be adjusted. One interlocking piece of both holding arms 16 and 7 for each turning position
The gripping position connecting 8 and 19 changes.

Therefore, the gripping position differs depending on the width of the bag, the positional relationship between the operating mechanism and the bag in each of the above-described packaging steps is not constant, and the operation of the bag cannot be performed reliably.
Therefore, when designing the actuating mechanism, it is necessary to allow a change in the gripping position, which causes a problem that the structure becomes complicated.

Further, since the swing arm 8, the fan-shaped gears 12, 15 and the like are used as the movable means of the both holding arms 16 and 17, the structure has to be complicated.

An object of the present invention is to perform a parallel movement of a pair of clamps so that the gripping position connecting the gripping portions of both clamps does not change even when the widths of the bags are different from each other, so that the bag can be reliably operated and the clamps can move. By utilizing the flexible interlocking rope as the means, the structure of the movable means can be simplified.

Structure of the Invention (Means for Solving the Problems) That is, the present invention, as shown in the drawings of the embodiments described later, has a pair of clamps 23 having openable and closable grips 17, 19.
Are supported so as to be able to approach and separate so as to move in parallel to each other, and are biased in a direction of approaching or separating from each other, and a moving plate 34 connected to both clamps 23 by a flexible interlocking rope 40 is attached to both clamps 23. It is movably supported through the interlocking rope 40 as it approaches and separates, and the adjustment plate 38 having the winding portion 39 around which the interlocking rope 40 is wound is supported so that its position can be adjusted. The engaging portion 36 provided on the moving plate 34 is provided with the stopper portion 6 which is pressed against the clamps 23 by the urging force.

(Operation) Now, when the adjusting plate 38 is positioned, the moving plate 34 is moved and positioned until the engaging portion 36 of the moving plate 34 is pressed against the stopper portion 6, whereby both clamps 23 are biased. Stop against and the intervals between them will be determined. When the position of the adjusting plate 38 is changed, the positions of both clamps 23 are also changed, and the distance between both clamps 23 is changed. At this time, both clamps 23 move in parallel with each other, and the holding position connecting the holding portions 17 and 19 of both clamps 23 does not change.

(Embodiment) An embodiment in which the present invention is embodied in a rotor of a rotary bag filling and packaging machine will be described below with reference to the drawings.

As shown in FIG. 2, an electric motor (not shown) is housed in the motor housing case 1, whereby the rotating drive shaft 2 is vertically supported in the support cylinder 3 on the case 1. ing. A turntable 4 shown in FIG. 1 is fixed to the upper end of the drive shaft 2 above the support cylinder 3. On the outer peripheral portion of the turntable 4, six bag mouth gripping devices 5 having the same structure are mounted at intervals of 60 degrees. Although not shown in the drawing, around the turntable 4 corresponding to these bag mouth gripping devices 5,
Bag feeding device A, bag opening device B, article feeding device C, bag degassing device D (this device can be replaced with another device depending on the purpose), bag mouth sealing device E and bag discharging device. A device F is provided for each. A cam plate 6 shown in FIG. 4 is fixed to the upper end of the support cylinder 3 below the turntable 4, and the cam radius RA corresponds to each of the devices A, B, C, D, E and F. , RB, RC, RD, RE, RF are defined respectively. On the lower side of the outer peripheral portion of the cam plate 6, claws 7 and 8 corresponding to the bag opening device B and the bag degassing device D are rotatably supported around a shaft 9. Both the claws 7 and 8 are rotated by rotary air cylinders 10 and 11 attached to the support cylinder 3.

 Next, each bag mouth gripping device 5 will be described in detail.

As shown in FIG. 3, a pair of slide plates 12 are supported by rollers 13 on the lower side of the outer peripheral portion of the turntable 4 so as to be movable along rails 14. A mounting plate 15 is fixed to both slide plates 12, and a pair of upper and lower rods are mounted on the mounting plate 15.
16 is fixed. Both rods 16 extend outward, and a grip plate 17 (grasping part) is fixed to the tip end portion thereof. A metal plate 18 having a large number of conical protrusions is attached to the grip plate 17. A gripping block 19 (grasping part) is inserted into both rods 16 so as to be movable in the axial direction, and a resin piece 20 is fitted to the gripping block 19 so as to face the metal plate 18. A grip release rod 21 is fixed to the grip block 19, and the rod 21 penetrates the grip plate 17 and extends outward. A compression coil spring 22 is wound around the outer peripheries of both rods 16 between the mounting plate 15 and the grip block 19, and the grip block 19 is urged toward the grip plate 17 by the compression coil spring 22. The resin piece 20 is a grip plate
It is designed to be pressed against a metal plate 18 of 17. In addition, the slide plate 12, the roller 13, the rail 14, the mounting plate 15, the rod 16, the grip plate 17, the metal plate 18, the grip block 19, the resin piece 2
The clamp 23 is constituted by 0, the grip release rod 21, and the compression coil spring 22. And these both clamps 23
Are adapted to move parallel to each other along the rail 14 in the directions toward and away from each other.

On the turntable 4, six rotary shafts 24 are supported by a pair of bearings 25 and 26 so as to be radially arranged. The rotary shaft 24 has a male screw portion between an intermediate portion and an inner bearing 25. 24a
And the slide shaft part 24 between the middle part and the outer bearing 26
b. A female screw member 27 is screwed to the male screw portion 24a, and a slide member 28 is fitted to the slide shaft portion 24b. A bevel gear 29 is attached to the inner end of each rotary shaft 24 at the center of the rotary disk 4. An electric motor 31 is attached to a bracket 30 fixed on the turntable 4,
A bevel gear 32 rotated by the electric motor 31 is meshed with a bevel gear 29 of each of the rotating shafts 24. When the electric motor 31 is driven, the rotary shafts 24 rotate via the bevel gears 32 and 29, and the female screw member 27 moves in the axial direction on the male screw portion 24a. The slide member 28 does not move in the axial direction even if the rotary shaft 24 rotates.

An elongated hole 33 is formed in the rotary disc 4 below each of the rotary shafts 24. A moving plate 34 is connected to the slide member 28 below the turntable 4 through the elongated hole 33. A cam roller 36 (engagement portion) is supported by a mounting block 35 fixed to the lower central portion of the moving plate 34, and the cam roller 36 is in sliding contact with the outer peripheral surface of the cam plate 6 and both pawls 7 and 8. I'm supposed to get it. Turntable 4 on both sides of moving plate 34
Auxiliary rollers 3 are attached to the tips of both arms 34a extending toward the center of
7 are supported. An adjusting plate 38 is connected to the female screw member 27 below the turntable 4 through a long hole 33. Four winding rollers are provided on the lower side of the outer edge of the adjusting plate 38.
39 (winding portions) are supported side by side, and both auxiliary rollers 37 of the moving plate 34 are located between the two winding rollers 39. Wires 40 (flexible interlocking ropes) are connected between the slide plates 12 of both the clamps 23 and the central portion of the outer edge of the moving plate 34. It is wound around 41 and both winding rollers 39 of the adjusting plate 38. Moving plate 34
Both auxiliary rollers 37 are always located closer to the center of the rotary plate 4 than the wire 40a between the two winding rollers 39, and the moving plate 34 and the adjusting plate 38
The wire 40a is wound according to the positional relationship with the wire.

A tension coil spring 42 is connected between the slide plate 12 of each of the clamps 23 and the turntable 4, and the tension coil spring 42
Thus, both clamps 23 are biased toward each other. When both clamps 23 are biased toward each other, the moving plate 34 is pulled by the wire 40 toward the center of the turntable 4. Therefore, the cam roller 36 of the moving plate 34 is constantly pressed against the outer peripheral surface of the cam plate 6 (stopper portion).

In the bag mouth gripping device 5 configured as described above,
When the adjusting plate 38 is positioned, the cam roller 36 of the moving plate 34 is
The moving plate 34 moves to the center side of the rotary plate 34 and is positioned until is pressed against the outer peripheral surface of the cam plate 6 by the bias of the tension coil spring 42. When the moving plate 34 is positioned, both clamps 23 stop against the biasing force of the tension coil spring 42, and the distance between them is determined. If you change the position of this adjustment plate 38,
The positions of both clamps 23 also change, and the interval between both clamps 23 also changes. At this time, since both clamps 23 move in parallel with each other, the holding position connecting the holding portions (holding plate 17 and holding block 19) of both clamps 23 does not change. When the cam radii RA to RF of the cam plate 6 change, the pressure contact position of the cam roller 36 of the moving plate 34 with respect to the cam plate 6 also changes, and the interval between both clamps 23 changes. That is, the distance between the clamps 23 is determined by the position of the adjusting plate 38 and the cam radii RA to RF of the cam plate 6.

The position of the adjusting plate 38 is stored in advance according to the width of the bag 43, and the electric motor 31 is drive-controlled so that the adjusting plate 38 is positioned at this set position.

Next, the interval adjusting action of both clamps 23 during the actual packaging process will be described when the width of the bag 43 that can be held by both clamps 23 is the maximum.

If the width of the bag 43 is input before operation, each bag mouth gripping device 5
The adjustment plate 38 of moves to the set position corresponding to the width.

In the bag mouth gripping device 5 corresponding to the bag feeding device Λ, the movable plate 34 moves to the position and both clamps 23 stop at the position as shown in FIG. ing. At this time, both auxiliary rollers 37 of the moving plate 34 are in contact with the wires 40a between the two winding rollers 39 of the adjusting plate 38 to bend them. In this state, when the grip release rods 21 of both clamps 23 are pushed against the urging force of the compression coil spring 22, the grip plate 17 and the grip block 19 open. When the bag 43 is inserted between them, the grip release rod
The pressing force on 21 is released, the grip plate 17 and the grip block 19 close each other, and the bag 43 is gripped between them.

After the bag 43 is supplied, the turntable 4 is rotated and the bag mouth gripping device 5 corresponding to the bag supply device A is moved to the bag opening device B, and the claw 7 of the cam plate 6 is shown by an imaginary line in FIG. From the position to the position shown by the solid line, move plate 34 as shown in FIG.
Moves to the position and both clamps 23 stop at the position,
The distance between them narrows to LB. At this time, the two auxiliary rollers 37 of the moving plate 34 move the wires 40 between the two winding rollers 39 of the adjusting plate 38.
leave from a. In this state, the bag 43 is opened.

Then, the turntable 4 rotates while the bag 43 remains open,
The bag mouth gripping device 5 corresponding to the bag opening device B moves to the article supply device C. At this time, both clamps 23 remain in the positions shown in FIG. 5, and the distance LC between them is the same as the distance LB. In this state, the article is supplied to the bag 43.

After the articles are supplied, the turntable 4 is rotated and the bag mouth gripping device 5 corresponding to the article supply device C is moved to the bag degassing device D, and the claws 8 of the cam plate 6 are at the positions indicated by the phantom lines in FIG. From the moving plate 34 as shown in FIG.
Returns to the position and both clamps 23 stop at the position, and their distance LD becomes the same as the distance LA. At this time, both auxiliary rollers 37 of the moving plate 34 come into contact with the wire 40a between the two winding rollers 39 of the adjusting plate 38, and the wire 40a is bent. Since the distance between both clamps 23 is widened from LC to LD, the mouth of the bag 43 is closed. In this state, the bag 43 is deaerated.

After deaeration, the turntable 4 rotates and the bag mouth gripping device 5 corresponding to the bag deaerator D moves to the bag mouth sealer E, and the moving plate 34 moves to the position as shown in FIG. Both clamps 23 then stop in position and their spacing becomes LE. Since this space LE is slightly wider than the space LD, the bag 43
Is given more tension. At this time, both auxiliary rollers 37 of the moving plate 34 are connected to the wire between the two winding rollers 39 of the adjusting plate 38.
It is in contact with 40a and is further bent. In this state, the mouth of the bag 43 is sealed.

After sealing, the turntable 4 rotates and the bag mouth gripping device 5 corresponding to the bag mouth seal device E moves to the bag discharging device F, and the moving plate 34 returns to the position as shown in FIG. The clamps 23 stop in position and their spacing LF is the same as said spacing LA, LD. At this time, both auxiliary rollers 37 of the moving plate 34 are in contact with the wires 40a between the two winding rollers 39 of the adjusting plate 38 to bend them. In this state, both clamps
The grip release rod 21 of 23 is pushed, the grip plate 17 and the grip block 19 are opened to each other, and the clamps 23 release the grip of the bag 43.

After the discharging, the turntable 4 rotates and the bag mouth gripping device 5 corresponding to the bag discharging device F moves to the bag feeding device A, the bag 43 is gripped again, and the same packaging process is repeated thereafter. In addition, each packaging process is performed simultaneously.

Next, a case where the width of the bag 43 that can be gripped by the clamps 23 is the minimum will be described. Also in this case, first, the adjusting plate 38 is positioned according to the width of the bag 43. The operation of the bag mouth gripping device 5 is basically the same as that described above, but as shown in FIG. 6, the position of the adjusting plate 38 is greater than that of the bag 43 having the maximum width (see FIG. 5). The distances LA ′, LB ′, LC ′, LD between the two clamps 23 of the bag mouth gripping device 5 corresponding to the respective devices A, B, C, D, E, F are farther from the center of the turntable 4. ′, LE ′, L
F'is the distance L between both clamps 23 in the case of the bag 43 with the maximum width
Narrower than A, LB, LC, LD, LE, LF. Also, the smallest width bag
In the case of 43, even if the moving plate 34 moves to the position, both auxiliary rollers 37 of the wire 40 between the two winding rollers 39 of the adjusting plate 38.
Does not touch a. Therefore, the distance LA ′, L between the two clamps 23
The difference between B ', LC', LD ', LE' and LF 'is the cam radius RA of the cam plate 6,
Different only based on the difference of RB, RC, RD, RE, RF.

However, as the width of the bag 43 increases, the difference needs to be increased.
The degree to which the wire 40a between the two winding rollers 38 of 38 is abutted and bent is increased. Therefore, when only the difference between the cam radii RA to RF of the cam plate 6 is used, the difference between the intervals LA to LF and LA 'to LF' between the clamps 23 is the same regardless of the width of the bag 43. When the wire 40a is bent by the auxiliary roller 37 in addition to the difference between RA and RF, the difference between the intervals LA to LF and LA 'to LF' between the clamps 23 increases in accordance with the degree of bending.

In addition, in the above-described embodiment, both clamps 23 may be urged in the directions away from each other. In this case, turntable 4
The wire 40 is wound around the upper winding roller 41 in the opposite direction.
Further, the movement adjustment of the adjustment panel 38 may be manually performed.

In short, according to the present invention, the distance between the clamps 23 can be optimized according to the width of the bag 43, and the gripping position by the clamps 23 can be changed even if the width of the bag 43 is different. Therefore, the bag 43 can be operated reliably. Further, since the flexible interlocking rope 40 is used as the movable means of both clamps 23, the structure of the movable means can be simplified.

[Brief description of drawings]

1 is a partially cutaway plan view showing a rotor equipped with a bag mouth gripping device according to the present embodiment in a rotary bag packing machine, and FIG. 2 is a sectional view taken along line XX of FIG. 1 is a partially enlarged bottom view of FIG. 1 showing a bag mouth gripping device according to this embodiment, FIG. 4 is a partially enlarged bottom view of FIG. 1 showing a cam plate, and FIG. FIG. 6 is an operation explanatory view of the bag mouth gripping device in the case of carrying out, and FIG. 6 is an operation explanatory view of the bag mouth gripping device in the case of gripping the bag having the minimum width. 4 ... rotary plate, 5 ... bag mouth gripping device, 6 ... cam plate (stopper part), 17 ... gripping plate (grasping part), 19 ... gripping block (gripping part), 23 ... clamp, 34 ... moving plate,
36 ... Cam roller (engaging part), 37 ... Auxiliary roller, 38 ...
… Adjusting plate, 39 …… Winding roller (winding part), 40, 40a …… Wire (flexible interlocking rope), 42 …… Tension coil spring, 43 ……
bag.

Claims (1)

(57) [Claims] 1. A pair of clamps (23) having openable and closable grips (17, 19) are supported so that they can move toward and away from each other so as to move in parallel with each other, and are urged toward and away from each other. The movable plate (34) connected to both clamps (23) by the flexible interlocking rope (40) is attached to both clamps (2).
With the approach and separation of 3), it is movably supported via the interlocking rope (40), and the position of the adjusting plate (38) having the winding portion (39) around which the interlocking rope (40) is wound can be adjusted. Support,
The stopper portion (6) is provided so that the engaging portion (36) provided on the moving plate (34) with the positioning of the adjusting plate (38) is pressed against the clamps (23) by the urging force. A gripping interval adjustment mechanism in a bag mouth gripping device.