JPH0356971B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides packaging bags to a rotor one by one, and each bag is supported and transported by the rotor in a hanging manner, In a rotary type bag packaging machine that seals the bag openings one after another after filling the bags with items during transportation, the bags are suspended from a rotor using vacuum suction. This invention relates to a bag support device for carrying.

(Prior art) In order to support bags in a bag filling and packaging machine, a purely mechanical clamping device that utilizes spring force is generally used. It is easy to make a catch error when pinching. Therefore, as shown in Japanese Utility Model Publication No. 54-37418, a bag has been proposed in which a pair of suction bars are used to suction and support both sides of the mouth of the bag. This type of support means that utilizes the suction force of air supports the bag with the differential pressure of the fluid, compared to the purely mechanical clamp described above, so that it reduces the chance of catching errors, and is somewhat effective in this respect.

(Problems to be Solved by the Invention, etc.) However, each of the above-mentioned suction bars is equipped with an on-off valve for opening and closing the vacuum passage. These on-off valves must be operated, but since the rotor rotates intermittently, the movement of the rotor cannot be used to operate the on-off valves, so a means of operating the on-off valves must be obtained from outside. However, the disadvantage was that it became complicated to operate the on-off valve in accordance with the movement of the rotor.

Furthermore, if a bag is supplied to a place where a pair of suction bars are spaced apart from each other, the bag cannot be attracted to these suction bars unless the pair of suction bars come relatively close to each other and come into contact with the bag. Since the rotor is still at rest, the suction bar cannot be operated using rotor movement. For this reason, the suction bar is operated using power from an actuator or the like, and therefore, in this case as well, the means for operating the suction bar is complicated.

In view of the above-mentioned points, the present invention enables the operation of the suction bar to control the vacuum action in the suction bar and the movement of the suction bar toward and away from the rotor to be performed without operating the actuator even when the rotor is stopped.

(Problems to be Solved by the Invention, etc.) In order to achieve the above object, the present invention provides a means for intermittently rotating a rotor having a large number of plates vertically disposed on its circumferential surface at the same pitch as the mounting interval of each plate; Means for rotating a grooved cam plate located on the upper surface of the rotor together with the rotor and then reversing and returning the grooved cam plate by the angle already rotated while the rotor is stopped; A fixed suction block for bag suction fixed in a shape, and an end of a rod located on the front side of each of the fixed suction blocks and fixed to the side end thereof are engaged with a groove formed on the upper surface of the cam plate. a movable suction block fixed to the upper surface of the grooved cam plate and operated integrally with the grooved cam plate; and a valve plate rotatably placed on the valve plate and adapted to the movement of the rotor. A fixed valve plate engaged with the rotor in synchronization, and a plurality of hoses having one end connected to the fixed valve plate and other ends connected to each fixed suction block and each movable suction block. , a vacuum passage formed between the valve plate and the fixed valve plate connects the fixed suction block and the movable suction block at least in the range from the bag feeding position to the article filling position formed around the rotor. The groove of the grooved cam plate is shaped so as to separate the movable suction block from the stationary suction block at least from the bag supply position to the article filling position, and the groove of the grooved cam plate The groove is formed so that the movable suction block approaches the stationary suction block at the bag feeding position due to the reverse movement of the plate.

(Function) According to the present invention, the rotor and the grooved cam plate rotate integrally, and while the rotor is stopped, the grooved cam plate returns in reverse by the angle through which it has already rotated. As a result, the grooved cam plate repeats forward and reverse rotation by a certain angle at the same position, while the rotor intermittently rotates only in the forward rotation direction together with each set of suction blocks. For this reason, each set of suction blocks is of the type that revolves around the grooved cam plate, and the movable suction block that engages with the groove of the grooved cam plate is fixed at least from the bag feeding position to the article filling position. Leaves the Shion block.

On the other hand, the valve plate fixed on the grooved cam plate rotates forward and backward together with the grooved cam plate, and the fixed valve plate provided on the valve plate is engaged with the rotor and rotates together with the rotor. The fixed valve plate rotates intermittently in the normal rotation direction while sliding its contact surfaces with respect to the valve plate.
A rotary valve is formed by such a valve plate and a fixed valve plate, and a vacuum is applied to a pair of suction valves by this rotary valve.

In particular, as mentioned above, the reversal action of the grooved cam plate when the rotor stops causes the movable suction block to approach the stationary suction block, which is open at the bag feeding position, so that bags can be fed. The bag is held between both suction blocks, and a vacuum is applied to both suction bars by instantaneous switching of the rotary valve, so that when both suction blocks are opened in the subsequent section, the bag is held between these suction blocks. It is supported by a shock block and opened. Therefore, even if the rotor is stopped, the bag can be held by the suction bar without using an actuator, and the bag can be sucked in a timely manner without drawing air from the suction bar.

(Example) FIG. 1 is a plan view of the device, in which six plates 10, 10... are arranged in a hexagonal shape around the central axis of the device,
The bag 1 is sucked by a pair of front and rear suction blocks 11 and 12 provided on each of these six discs, and each disc is intermittently rotated one pitch at a time around the shaft, and at six stopping positions. This system is designed to supply bags, fill them with items to be packaged, seal the bag opening, etc. More specifically, as shown in FIG. 2, the device includes a box-shaped machine base 15, and a cylindrical bearing sleeve 16 is vertically fixed to the center upper surface of the machine base. A cylindrical main shaft 17 is supported via ball bearings 18 and 19, and a circular rotor 20 formed continuously at the upper end of the main shaft 17 is supported on the upper surface of the bearing sleeve 16 via a thrust bearing 21. , furthermore, six arms 22 projecting radially from the surface of the rotor 20,
The six boards 10, 10... are fixed vertically to the tips of the boards 22.... Further, a Geneva 23 divided into six equal parts, which is a part of an element for intermittently transporting the bag support element, is fixed to the lower end of the main shaft 17, while a driving shaft 24 is fixed to the lower end of the main shaft 17.
A pin 26 provided on a part of the foil 25 fixed to the Geneva 23 is engaged with the Geneva 23, and when the driving shaft 24 is rotated by a drive source (not shown) such as a motor or a prime mover, the The pin 26 revolves around the drive shaft 24, and the pin 26 periodically engages with the Geneva 23 to intermittently rotate the main shaft 17. For this reason, the six plates 10, 10, . . . rotate intermittently at a pitch of 60 degrees. Furthermore, the main shaft 1
A mandrel 27 is rotatably provided inside the mandrel 27.
The lower end of the chain 3 is supported by a bearing 28 fixed to the bottom surface 15a of the machine base, and a grooved cam plate 29 is connected to the upper end of the mandrel 27.
A cam 32 is fixed to a driven shaft 31 that is connected to the cam 32 via a cam 32. As shown in FIG. 3, the driven shaft 31
A bell crank 34 whose supporting axis is a pin 33 provided at a predetermined distance from the bell crank 34 is brought into contact with the cam 32 by the tension of a spring 37, and is fixed to the lower end of the bell crank 34 and the mandrel 27. The lever 35 is connected to the lever 35 through a link 36, and the swinging movement of the bell crank 34 is controlled by the link 36 and the lever 3.
5 to the mandrel 27, and the grooved cam plate 29 fixed to the upper end of the mandrel repeats inversion within an angle range of about 60 degrees.

Already, for Figure 1, six boards 10, 10...
are a pair of suction blocks 11 and 12, respectively.
The details of these suction blocks are as shown in FIGS. 4 and 5. That is, a pedestal 38 is provided at the upper part of the front surface of the board 10, and two pins 39, 39 fixed to the back side of the stationary suction block 11 are slid into two holes 40, 40 made in the pedestal. The pins 39 and 3 are supported freely between the fixed suction block 11 and the pedestal 38.
Tension springs 41, 41 are provided around the pins 39, and the tension of these springs 41, 41 pushes the stationary suction block 11 away from the board. These heads 42, 42 are arranged to function as a stopper. On the other hand, a sealing base 13 is provided above the fixed suction block 11, and a movable suction block 12 is provided on the front side thereof. Connect one end of this movable suction block 12 to the rod 4.
3, and the rod 43 is supported by a boss 45 that is provided to pass airtight between the front and back sides of the board 10,
Operation of the rod 43 allows the movable suction block 12 to approach or move away from the stationary suction block 11. Furthermore, both suction blocks 11 and 12 have hollow interiors, and a plurality of suction holes 4 are formed on opposing surfaces of both suction blocks.
6, 46, 47, and 47 are opened, and the bag 1 is attracted to the suction holes using vacuum suction force.
In particular, the movable suction block 12 has a plurality of elastic friction materials 4 made of rubber separated from each other by suction holes 47, 47.
8, 48, 48 are buried so as to protrude from the surface of the block. In order to apply a vacuum to both suction blocks, a flexible tube 50 is connected between the end of the fixed suction block 11 and a port 49 formed in a part of the boss 45, while the movable suction block Shion block 12
A long hole 51 is formed in the side surface of the tubular block 43,
Even when the rod 43 strokes, it communicates with the port 49 through the elongated hole 51. As shown in FIG. 1, one end of a branch hose 57, 57 is brought into contact with the port of each of the bosses 45, 45, .

As shown in Figure 2, a grooved cam plate 29 is provided at the upper end of the mandrel
The lower end of the pipe joint 54 is rotatably inserted into the recessed hole 52 formed in the center of the upper surface of the valve disc via the small diameter cylinder part, and the upper end of the joint 54 is A donut-shaped fixed valve plate 59 is placed on the valve plate 58, and six ports 60, 6 formed on the upper surface of the fixed valve plate 59 are connected to the main hose 55 for the vacuum pump.
0... are connected to six branch hoses 57, 57... each having an automatic shutoff valve 2 interposed therebetween. As shown in an enlarged view in FIG. 6, a donut-shaped fixed valve plate 59
has six ports 60, 60 formed vertically and penetratingly at equal intervals, while an arc of a predetermined length is formed on the upper surface of the valve plate 58 located below the ports 60, so as to face the ports 60. A groove 61 is formed, and the arcuate groove 61 and the hollow hole 52 into which the pipe joint 54 in the center is inserted are connected via a communication path 62.

As shown in FIG. 7, the automatic shutoff valve 2 installed in the branch hose has a truncated cone-shaped valve 66 mounted on a valve seat 65 formed in a valve box 64 and a coil spring 6 on the lower side.
It is arranged in a normally open manner through 7.
When the air sucked by the vacuum pump attempts to flow from the secondary side 72 to the primary side as shown by the solid line arrow, the valve 66 closes the valve seat 65 while compressing the spring 67. If an air leak occurs in any of the suction blocks, the automatic shutoff valve 2 of that passage closes the passage and prevents the suction force from decreasing in the other vacuum passages. There is.

As shown in FIG. 1, the circular grooved cam plate 29 has a winding groove 78 on its upper surface. Since the number of installed boards 10 is six, this groove 78 is designed to have a shape suitable for the number of installed boards, and if the number of installed boards increases to eight, the shape must of course be changed. In any case, the function of this groove 78 will be understood from the explanation below. On the other hand, as already explained, the six rods 4
3, 43... protrudes from the back side of each board 10, 10..., and is a rectangular block 79 fixed to the end thereof.
A rod-shaped guide 8 with a hole formed in it and fixed to the back of the board
0 is slidably engaged in the hole of the block 79 to restrict the rotation of the rod 43, and small idlers 81, 81... are rotatably supported on the lower surfaces of the blocks 79, 79... Said groove 78
is engaged with. Further, the tips of the six rod-shaped guides 80, 80... are respectively engaged with the circumferential surface of the fixed valve plate 59 via the bracket 82, and the six plates 10... and the fixed valve are connected via these rod-shaped guides 80. Board 5
9 are integrally connected.

Furthermore, six alphabet symbols A, B,
Among the stopping positions of each board 10, indicated by C, D, E, F, a bag feeding position as shown in FIG. 8 is provided at the position indicated by the symbol A in FIG. The bag feeding device is a piston rod 92 of an air cylinder 91.
A suction bar 93 is provided at the tip of the air cylinder 91, and the rotational power of a shaft 94 connected to the end of the air cylinder 91 moves the suction bar 93 into a large number of bags 1, 1.
... are reciprocated between the stacked area and the board 10, and the bag 1 sucked by a suction bar 93 is supplied between both suction blocks 11 and 12 of the board.

(Function) The illustrated device has the above configuration, and its function will be explained below.

In FIG. 2, since the pin 26 provided on the continuously rotating driving shaft 24 periodically kicks the Geneva 23,
The main shaft 17 and the rotor 20 rotate by 60 degrees at regular time intervals. For this reason, suction block 1
The bag support elements formed by 1 and 12 are conveyed on an endless track with the same pitch as the installation interval of each bag support element. At the same time, the driving shaft 24
By means of a cam 32 provided on a driven shaft 31 that interlocks with the cam 32, the required rod 27 repeats forward and reverse rotation within a 60 degree angle range. Specifically, the grooved cam plate 29 connected to the shaft 27 and the rotor 20 start at the same time and rotate by 60 degrees in the same direction, and while the rotor 20 is stopped, only the grooved cam plate 29 rotates by 60 degrees. It turns around and returns to its original position. FIG. 1 shows the state immediately after the rotor 20 and the grooved cam plate 29 have simultaneously rotated clockwise by 60 degrees from the starting point and stopped. At this time, in section A, both suction blocks 11,
Bag 1 is supplied during 12. As shown in FIG. 8, the top bag among a large number of stacked bags is sucked by a suction bar 93, and by rotation of a shaft 94, suction blocks 11, 12 are removed from below.
Insert it between the two. In this case, the position of the cam 32 is as shown in FIG. 3. In other words, the bell crank 34 is in contact with the point of the cam 32 having the smallest radius and is at the position where it is stretched most clockwise. From this state, as the cam 32 rotates in the direction of the arrow, the driven shaft 17 starts to rotate counterclockwise, and the grooved cam plate 29 starts to rotate counterclockwise from the state shown in FIG. (At this time, the valve plate 58 in FIG. 6 is rotated counterclockwise.) The groove 78 is most meandering in the A section, and as a result of the small idler ring 81 being guided by this meandering portion, it is movable in the A section. The side suction block 12 is the fixed side suction block 1.
1 and clamp the opening of bag 1. At the same time, in FIG.
As a result, a vacuum is applied to suction blocks 11 and 12 facing each other in A section A, and bag 1 is attracted. As can be seen from the shape of the groove 78 from the A section to the B section, the movable suction block 1 is moved by reversing the grooved cam plate 29.
Since the bag 2 is again separated from the fixed suction block 11, the mouth of the bag 1, which is attracted to both suction blocks, is opened. On the other hand, since the shape of the groove 78 from the B section to the C section is parallel to the circumferential surface of the grooved cam plate 29, the grooved cam plate 29
Even if the direction is reversed, the bag 1 of the B section remains open. Therefore, in the B section, articles are filled into the bag through the opening by a predetermined means. On the other hand, since the groove 28 is formed closer to the center of the cam from the C section to the D section, the reversal action of the grooved cam plate 29 causes the movable suction block 12 to move closer to the fixed suction block in the C section. be drawn in the direction of Since the groove 78 from the D section to the F section is a small perfect circular arc, the bags 1, 1 in both the D and E sections remain clamped by the suction block even when the grooved cam plate 29 is reversed.

In FIG. 7, the suction force by the vacuum pump acts as shown by the solid line arrow, but as long as the bag 1 is attracted to the suction blocks 11 and 12, no air flow occurs inside the valve box. There is no pressure difference between the valves 66 and 67, so that the valve 66 remains pushed up by the spring 67. However, if air leaks between the suction blocks 11, 12 and the bag 1, air flows as shown by the solid arrow, and the valve 66 presses against the valve seat 65 against the force of the spring 67. Close to prevent air from entering the vacuum pump. Therefore, the vacuum suction force for other bags does not decrease.

Although not shown in the drawings, vacuum chambers are provided in the D section and E section in FIG. 1, and it is possible to apply a vacuum to the bag in both sections for vacuum packaging. A sealing bar 94 as shown in FIG. 5 is installed in the F section, and the opening of the bag 1 can be melt-sealed by pushing the sealing bar 94 toward the sealing stand 13 and using a heating wire 96.

As shown in FIG. 6, an air inflow hole 95 is formed in the lower valve plate 58.
When the port 60 communicates with the suction block 5, air flows in as shown by the dotted arrow in FIG. 7, and the bags 1 of the suction blocks 11 and 12 are released from the vacuum suction force. However, as long as the clamping force of the tension spring 41 and the frictional force of the elastic friction material 48 are acting on the bag as shown in FIG. 5, the bag 1 will not be released from between the suction blocks 11 and 12. And in the F section, both suction blocks 11,1
By separating bag 2, bag 1 is released.

(Effects) As described above, the present invention allows the grooved cam plate 29 and the valve plate 58, which rotate integrally with the rotor 20, to be reversed by the angle of rotation while the rotor 20 is stopped. Since the vacuum of the movable suction block 12 is switched by the plate 29, and the vacuum of the suction block is switched by the valve plate 59, even when the rotor is stopped, the vacuum is supplied between the pair of suction blocks. Vacuum can be applied to the pair of suction blocks at the same time as the bag is clamped, eliminating the need to operate multiple sets of suction blocks individually using actuators as in the past, and making it possible to install a switching valve for each suction block individually. Without the need for a vacuum cleaner, a single rotary valve can clamp the bag with the suction block and simultaneously switch the vacuum, thereby preventing air from flowing into the vacuum line.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in the previous figure, Fig. 3 is a - line view in the previous figure, and Fig. 4 is a - line view in Fig. 2. , FIG. 5 is a - line view of the previous figure, and FIGS. 6 to 8 are partial explanatory views. 1...bag, 2...automatic shutoff valve, 10...board, 1
1... Fixed side suction block, 12... Movable side suction block, 17... Main shaft, 23...
Geneva, 24... Driving shaft, 27... Mandrel, 29...
... Groove cam plate, 31 ... Driven shaft, 41 ... Tension spring, 48 ... Elastic friction material, 58 ... Valve plate, 59 ...
...Fixed valve plate, 61...Circular groove.

Claims (1)

[Claims] 1. A means for intermittently rotating a rotor 20 having a large number of plates 10, 10... vertically disposed on its circumferential surface at the same pitch as the mounting interval of each plate, and a grooved cam plate 29 located on the upper surface of the rotor are integrated with the rotor. means for returning the rotor in reverse by the angle already rotated while the rotor is stopped after being rotated, and a fixed side suction block 11 for bag suction fixed in a horizontally oblong shape to the outer surface of each of the plates. , 11 . . . and movable suctions in which the ends of rods 43, 43 . blocks 12, 12..., a valve plate 58 fixed to the upper surface of the grooved cam plate and operated integrally with the grooved cam plate, and a valve plate 58 rotatably placed on the valve plate and adapted to the movement of the rotor. A fixed valve plate 59 engaged with the rotor in synchronization, and a plurality of hoses 57, 57, whose other ends are connected to the fixed valve plate at one end to each fixed suction block and each movable suction block. A vacuum passage formed between the valve plate and the fixed valve plate is connected to the fixed side suction block at least in the range from bag feeding position A to article filling position C, and a vacuum passage formed between the valve plate and the fixed valve plate is formed around the rotor. and the movable suction block, and the groove of the grooved cam plate is such that the movable suction block is separated from the stationary suction block at least from the bag feeding position A to the article filling position C. The groove is shaped so that the movable suction block approaches the stationary suction block at the bag feeding position due to the reverse return action of the grooved cam plate. A bag support device in a packaging machine.