JPH0311126Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to an arch guide support device for a band guide arch provided on the main body of a packaging machine.

[Technical background]

An automatic packing machine equipped with a so-called band guide arch feeds packing bands into the band guide arch by a band supply mechanism within the packing machine main body, arranges them in a loop so as to surround the object to be packed, and After the leading end is gripped and fixed by the band tip gripping mechanism in the main body, the band feeding end side is pulled back from the band in the main body, tightened by the tightening mechanism, and the band escapes from the flap in the band guide arch, and the band is tightened. After the packaged item is tied up, the band supply end side is gripped and fixed by the band supply end side gripping mechanism, and the overlapping parts of the band tip side and the supply end side are welded by the band welding mechanism in the main body, and the area near the welded part on the supply end side is welded. It is configured to cut and package. When the band is pulled back, the band is pulled out from the flap, and during the band pulling back process in which the band is wound around the object to be packed, the band that escapes from the flap meanders and falls onto the object to be packed.
For example, if the band is tightened due to friction with the top corner of an object whose top surface is rectangular, and the band is hung diagonally to the object to be packed, the packing distance will not be the shortest distance from the object to be packed, so during transportation. In the worst case, the excess band would come loose, and in the worst case, the band would come off from the packaged item, causing fatal defects.Especially in recent years, it has become widely used for economic reasons5. In the case of a narrow band of ~6 mm, the meandering during ejection is large, and boxes made of foamed polystyrene, which are often used as packaging materials, have large friction and are particularly prone to such packaging defects.

[Prior art and problems]

Therefore, as a means to solve this drawback, the method disclosed in Japanese Patent Publication No. 52-7400 is to form a series of arch guides 91 made of flexible resin with a U-shaped cross section into a loop shape, as shown in FIG. The arch guide 91 is suspended by the springs at the same time that the U-shaped opening surface is pressed against the inner wall surface of the arch cover 92 by a plurality of springs 93. In addition to supporting and forming a band passage path 94, the entrance horizontal part of the arch guide 91 is forcibly expanded when the band is pulled back, and the band is supplied by the flexibility of the arch guide 91 itself due to the tensile force applied to the band when the band is pulled back. Pull out the band sequentially from the end to the tip,
After the band is released, the flexibility allows the band to automatically return to its previous position one by one. However, with this method, the opening surface of the flexible resin arch guide is cut at the edge of a band made of general-purpose polypropylene, polyester, etc. when the band is released, creating a hangnail-like protrusion on which the band gets caught. In addition to the band's inability to escape, the following shortcomings and problems were discovered. That is, since the arch guide is integrally molded from flexible resin, when the arch guide is suspended and supported, it is extremely rare for its opening surfaces to be flush with the same vertical plane. The tensile force of the spring 93 cannot keep the entire U-shaped opening surface of the arch guide 91 in pressure contact with the inner wall surface of the arch cover 92, and when the band is supplied and pulled back, the tensile force of the spring 93 is weak in the parts. There have been cases where the band has jumped out or escaped, making it impossible to supply the band satisfactorily or to pull the band back sequentially and continuously. Furthermore, due to the flexibility of the spring and arch guide, the horizontal straight portions on both sides near the band welding were swung up and down, making it impossible for the band to reach the welding portion. In addition, this problem is particularly noticeable in thin, stiff, narrow bands and relatively inexpensive foreign-made bands, but plastic bands for packaging machines, such as polypropylene bands, are produced during the manufacturing process that includes stretching or winding onto paper core tubes. When the band is supplied, the band frequently pops out from a location where the U-shaped opening surface of the arch guide 91 is not in pressure contact with the inner wall surface of the arch cover 92. In order to prevent this, it is necessary to provide a large number of springs 93 and even stronger springs, but in this case, when the band is pulled out from the arch guide, the springs are too strong and the band cannot be pulled out, causing the band to be tied in the middle. I can't make it stronger because I get used to it. Furthermore, the arch guide must provide enough resistance to prevent the band from meandering when the band escapes, but the flexibility of the arch guide forces the first corner portion to expand. However, when the band in that section started to escape,
The entire arch guide is bent, and when the band escapes, there is no force to press the band between the opening surface of the arch guide and the inner wall surface of the arch cover against the band that is escaping, and the band is meandering or exposed at once from the entire arch guide. This resulted in the drawback that the product fell in a meandering manner onto the packaged item. These drawbacks become even more noticeable as the flexible resin arch guide deteriorates over time due to long-term use. Therefore, in Utility Model Application No. 60-62005, as shown in Fig. 6A and B, one wall surface 7 of the arch-shaped machine frame 71 is
2 is provided with a fixed shaft 73, a bearing member 74 is movably provided on this fixed shaft 73, one end of a plate spring 75 is supported on this bearing member 74 with a pin 76, and the other end is supported with a pin 78 on a guide fixed piece 77. An arch guide 79 made of a flexible material and having a U-shaped groove 81 is provided on the guide fixing piece 77, and between the guide fixing piece 77 and the other wall surface 80, the arch guide 7
A contact piece 8 having a U-shaped groove 81 in the machine frame 71
At the same time, a coil spring 83 is attached to the coil spring 83 to bring the band into close contact with each other in order to prevent the band from flying out, and in order to release the force of the coil spring which cannot be produced by the force of pulling out the band, the solenoid 84 is energized. An arch guide support device has been proposed in which the guide fixing piece 77 is lifted up with respect to the abutting piece 82 by the operating rod 85 to release two-thirds of the band width from the U-shaped groove 81 of the arch guide 79. Although it is possible to bring the arch guide into close contact with the abutment piece by this means, the stronger the pressing force, the greater the damage and wear on the edge of the opening surface of the arch guide caused by the band. The leaf spring 75 can only provide resistance to the force in the vertical direction of the arch guide 79, and bringing the arch guide 79 into close contact with the contact piece 82 depends only on the force of the coil spring 83. Moreover, the effect of the flexible arch guide is reduced by the action of the leaf spring and the solenoid, and furthermore, by forcibly expanding the arch guide 79 by the solenoid 84, even if the arch 2/3 of the band width is released from the U-shaped groove 81 of the guide 79, and even though some force is applied to the band when the band is pulled out, this is a characteristic of the original arch guide made of flexible material. However, if the band is pressed down one after another, the above effect is completely eliminated, and the above-mentioned disadvantage cannot be completely eliminated.

【the purpose】

The present invention was developed in order to eliminate the drawbacks of the above-mentioned conventional technology, and even if the arch guide is made of flexible resin, the opening surface of the arch guide is surely pressed against the guide plate when the band is supplied, so that the band can escape. It is an object of the present invention to provide an arch guide support device that can provide an appropriate resistance to prevent the band from meandering in some cases.

[Means to solve the problem]

In order to achieve the above object, the present invention forms a series of arch guides 20 that form a band passing path with one side open, and has both ends facing the band welding mechanism, so that the opening surface 23 of the arch guide 20 is In the band guide arch of a packaging machine, which is formed in a cover-like manner facing the guide plate 16 and has means for forcibly expanding the vicinity of a corner portion of the arch guide 20 on the band entrance side, the arch guide is horizontally moved. It is freely suspended and supported by the rods 12, 12, and a rotatable support piece 43 is freely moved toward and away from the back surface by a solenoid 40 at an appropriate position on the back surface opposite to the opening surface of the maximum straight portion of the arch guide. The present invention is characterized in that a spring is attached for biasing the support piece 43 toward or away from the rear surface.

[Effect]

Therefore, in normal times, the arch guide is pressed through the rotatable support piece by a spring or solenoid that biases the support piece, and the opening surface is brought into contact with the guide plate, supplying the band into the arch guide and releasing the band. At the time of tightening, the solenoid is energized to release the pressure of the opening surface of the arch guide suspended by the rod against the guide plate, or the solenoid is de-energized and the support piece of the spring is moved to the back of the arch guide. The support piece releases the pressure of the opening surface of the arch guide against the guide plate by the biasing force in the direction away from the arch guide, and the band is successively continued from the vicinity of the band entrance side corner of the arch guide that has been forcibly expanded. make them escape.

【Example】

Hereinafter, details of the present invention will be explained based on drawings showing embodiments. First, to explain the overall configuration, it is equipped with a band reel wrapped with a packing band (not shown), and a second
As shown in the figure, the packing machine main body houses various mechanisms necessary for packing, such as known band supply/pull-back mechanisms 33 and 34, band tightening mechanism 39, band tip gripping mechanism G, and welding mechanism S. , an arch cover 11 straddling the band guide arch 10 is provided. The arch cover 11 is made up of a pair of front and rear L-shaped cross-sectional frame bodies and a U-shaped frame body, which are butted against each other, and are fixed vertically onto the packaging machine main body. In addition, an arch guide 2 is provided inside the arch cover 11.
0 is set. The entire arch guide 20 has a substantially downward C-shape with substantially straight lines other than the corner portions W to Z, and one end thereof faces the band welding mechanism when supplying the band, and faces the straight section on the inlet side of the band supply end.
EN, and the other end faces the band tip gripping mechanism G of the band welding mechanism S, forming an outlet side straight section EX on the band tip side. The arch guide 20 is made of metal or resin, with corner portions and straight portions molded separately to arbitrary radii and lengths according to the desired arch size, and each portion is connected to form a U-shaped cross section. an inner circumferential piece 22 having an opening 23 and forming a piece in the direction of the center of the arch, each of which has an inner surface made of a straight and smooth surface, as shown in FIGS. 1A, B to 3A to C, for example; It is formed in series with an outer circumferential piece 21 forming one piece in the opposite direction from the center of the arch, and the inner circumferential piece 22 and the outer circumferential piece 21 are integrally molded or, as shown in FIGS. The plate pieces constituting the inner peripheral piece 22 and the outer peripheral piece 21 can be fixed with screws, or they can be manufactured as a series or an integral piece made by drawing and molding aluminum. Then, the opening surface 2 of the arch guide 20
Reference numeral 3 denotes a guide plate 1 formed of a plate piece made of a material with low friction and provided at a contact portion of the inner wall surface of the arch cover 11 or the series of opening surfaces 23.
The band passage path 24 is formed perpendicularly to the width of the band 6 and has a width approximately 1.5 to 6 times wider than the band width (for example, 4.5 to 19 mm) depending on the band width used. In addition, the arch guides of the straight parts EN and EX on the first and fourth corners W and Z sides near the band welding mechanism S are L.
It is formed by overlapping letter-shaped plate pieces 21 and 22, and its internal width is slightly narrower than other parts depending on the band width. In addition, in Figure 2, 46
is a support piece that is attached to a horizontal portion near the fourth corner Z of the arch guide 20 and supports the arch guide in that portion so as to be horizontally movable. The arch guide 20 is
As shown in the figure, it is suspended within the arch cover 11 by a pair of rods 12, 12, and under normal conditions, due to its own weight, a series of opening surfaces 23 are opposed to the guide plate 16 formed by the inner wall surface of the arch cover 11. ing. That is, the bent portions of the lower ends of both rods 12, 12 are rotatably fitted into the holes of the brackets 14, 14 fixed to the back surfaces of the left and right straight portions of the arch guide 20, and the bent portions of the other ends are inserted into the holes of the brackets 14, 14 fixed to the back surfaces of the left and right straight portions of the arch guide 20, and the bent portions of the other ends are inserted into the holes of the brackets 14, 14 fixed to the back surfaces of the left and right straight portions of the arch guide 20, and guide 20
The arch cover 11 is rotatably fitted into holes in brackets 15, 15 protruding from the inner wall of the arch cover 11 above the upper corner portions X, Y of the arch cover 11. both rods 1
The attachment points to the arch guides 20 of 2 and 12 are located on the guide plate 16 formed on the inner wall surface of the arch cover 11 than the attachment points to the brackets 15 and 15.
Therefore, the arch guide 20 is always urged in the opposite direction of the guide plate 16 by its own weight, and the opening surface 23 is urged away from the guide plate 16. Note that it is desirable to adjust the distance of the gap when the opening surface 23 is separated from the guide plate 16 by the above-mentioned urging so that it is slightly shorter than the width of the band to be used. A stopper that comes into contact with the back surface of the guide 20 may be provided, or the rotation distance of the support piece when the solenoid (to be described later) is energized may be restricted. FIGS. 1B and 2 show a mechanism for keeping the opening surface 23 of this arch guide 20 in close contact with the guide plate 16.
Rod ends 45, 45 are fixed inside 15,
A rod 42 is rotatably installed on these rod ends 45, 45. Then, a support piece 4 is placed at an appropriate location of the rod 42, for example, near the third and fourth corner portions X and Y.
3 and 43 are attached, and the pads at the upper ends of these support pieces 43 and 43 are provided so as to abut against the back of the arch guide 20. On the other hand, the shaft end of the rod 42 protruding from a rod end 45 fixed outside the third corner Y of the rod 42 is fitted into a hole provided at the tip of a fixture 44, and an arch is formed at the rear end of this fixture 44. The operating rod 47 of the solenoid 40, which is energized when the guide is opened, is connected. Further, a spring 48 extending from the arch cover 11 is attached to the rear end of the fixture 44, and in order to bias the rear end of the fixture 44 downward in FIG. The opening surface 23 is urged toward the guide plate 16. The drag force of this spring 48 is larger than the biasing action of the rods 12, 12 that bias the arch guide 20 by its own weight to move the opening surface 23 away from the guide plate 16, but is smaller than the magnetic force of the solenoid 40, and is smaller than the magnetic force of the solenoid 40. When 40 is not energized, the action of this spring 48 causes the support pieces 43, 43 to move toward the arch guide 20.
The opening surface 23 of the guide plate 16 is brought into contact with the guide plate 16 in a covered manner to form a band passage path 24. In addition, as shown in FIG. 4, a cam 51 provided at the end of a cam shaft 50 that operates a welding mechanism S including a band tip gripping mechanism G is provided in the packaging machine body as a forced opening means for the arch guide. The upper end of the sliding member 37, which includes the cam follower 52 that slides and rotates, is connected to the inlet side straight section EN near the band welding mechanism S in the vicinity of the first corner W of the arch guide 20 via the bracket 43. Note that the support piece 46 of the exit-side linear portion EX on the fourth corner Z side may be moved a little later than the arch guide opening action of the sliding member 37 to forcibly open that portion as well. . This is effective when the arch size is extremely large. Next, the operation of the above embodiment will be described. Now, the band B is moved to the arch guide 20 and the arch cover 11 by normal rotation of the feed rollers 33 and 34.
The band is fed into a band passageway 24 formed by a space between the guide plates 16 formed by the inner wall surfaces of the band.
The band runs along the inner surface of the outer peripheral piece 21 of the arch guide 20 in the opposite direction to the center of each arch,
Straight section EN on the band entrance side near the first corner W
to the first corner W, passing through the second corner X, third corner Y, fourth corner Z, and the straight line between each corner, and then to the straight line near the fourth corner Z on the band exit side. Arch guide 2 via part EX
0 and reaches the bottom surface of the slide table 35, and the camshaft 50 rotates by turning on the start button.
The tip of the band B is gripped and fixed by a gripping mechanism G. The inner width of the arch guide in the straight section EX near the band tip gripping mechanism G of the welding mechanism S is slightly narrower than other parts depending on the band width, so the band on the supply end side and the tip side should be adjusted accurately. Polymerize. Before the feed rollers 33 and 34 start rotating in reverse, the band tip gripping mechanism G is actuated by the camshaft 50 that starts rotating, and when the band tip is gripped, a signal is generated and the solenoid 40 is energized. solenoid 4
0, the operating rod 47 of the solenoid 40 contracts against the resistance of the spring 48, and the fixing member 44 moves to the first position.
Diagram B rotates clockwise, rod end 45,
Since the rod 42 rotatably supported by the arch cover 11 also rotates in the same direction, the back of the arch guide 20 is pressed on the fixture 44 and the opening surface of the arch guide 20 is connected to the guide plate formed by the inner wall surface of the arch cover 11. Support pieces 43, 43 that were in strong contact with 16
is away from the back and the arch guide 20 becomes free, and the opening surface 23 of the arch guide 20, which is suspended by the rods 12 and 12 and is always urged in the opposite direction of the guide plate 16 by its own weight, is separated from the guide plate 16. Leave. Then, before the feed roller starts reversing, the sliding member 37 is slid by the cam follower 52 that is in pressure contact with the cam 51 provided on the cam shaft 50 after the band tip is gripped by the cam shaft 50 that starts rotating, and the linear portion EN is moved to the fourth position. After being moved forward in the plane of the drawing, the band B in the band passage path 24 formed by the arch guide 20 and the guide plate 16 starts to escape from the first corner W of the arch guide 20, and the band B starts to escape from the arch guide 20. The band is successively pushed out, and is regulated by the opening edge of the inner circumferential piece 22 and the surface of the guide plate 16, and escapes from the arch guide 20 one after another while receiving appropriate clamping pressure to prevent band wobbling, in other words, to prevent meandering. . Then, when the reversal by the feed rollers 33 and 34 is completed by the timer and the escape of the band B is completed, the power to the solenoid 40 is cut off, and the support pieces 43 and 43 are returned to their original positions by the biasing force of the spring 48. Furthermore, after the feed roller has completed its reverse rotation, the straight portion EN of the arch guide 20 is returned to its previous position simultaneously with the rotation of the camshaft 50 that tightens the band. Then, the entire arch guide 20 returns to its old position. The band wound around the object to be packed is tightened by pulling back as described above, and after going through a series of processes of gripping the supply end, cutting, and welding, the band is fed into the arch guide 20 for the next packing, and one packing process ends. In addition, in the above embodiment, the action direction of the solenoid 40 due to energization, the biasing direction of the spring 48, and the biasing direction due to its own weight by changing the support positions of the upper and lower ends of the rods 12 and 12 of the arch guide 20, respectively.
In the opposite direction to the above, arch guide 2
0 is pressed against the guide plate when the solenoid 40 is energized, and when the band is supplied into the arch guide 20 and the band is tightened, the solenoid is de-energized and the pressure of the support piece 43 against the arch guide is released. The arch guide suspended by the rods 12, 12 is subjected to a biasing force in the direction of separating the support piece of the spring 48 from the rear surface of the arch guide, resisting the bias due to its own weight in the direction of closing the arch guide, or the arch guide suspended by the rods The opening surface of the arch guide is separated from the guide plate by its own weight in the direction of opening the arch guide, and the forcibly expanded arch guide is successively escaped from the vicinity of the first corner W to the fourth corner Z. It can also be configured as follows.

【effect】

As described above, the present invention forms a series of arch guides that form a band passing path with one side open, and has both ends facing the band welding mechanism.
In the band guide arch of a packaging machine, the opening surface of the arch guide is formed in a cover-like manner so as to face the guide plate, and the band guide arch has a means for forcibly expanding a corner portion of the arch guide on the band entry side. The arch guide is suspended and supported by a rod so as to be horizontally movable, and a support piece rotatable by a solenoid is placed at an appropriate position on the back surface opposite to the opening surface of the maximum straight portion of the arch guide so as to be able to move toward and away from the back surface. In addition, since a spring is attached to bias the support piece toward or away from the back surface, even if the arch guide is made of flexible resin, the opening surface of the arch guide can be reliably attached to the guide plate when supplying the band. By pressing the band into contact with the arch guide, it is possible to prevent the band from jumping out from the gap between the arch guide and the guide plate, and when the band comes out, it is possible to apply appropriate resistance due to the arch guide's own weight to prevent the band from meandering. , the band can be continuously pulled out from the band entrance side of the arch guide.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1A shows the suspended state of the arch guide 20, and FIG. 1B is a schematic diagram of the main part showing the forced closing mechanism of the arch guide. Figure 2 is the overall front view, Figure 3 A,
B and C are sectional views of main parts taken along lines A-A, B-B and C-C in FIG. 2, respectively, and FIG. 4 is a side view showing an example of a means for forcibly opening the band in the vicinity of the band welding mechanism. Further, FIGS. 5 and 6 are schematic partial sectional views showing the prior art. 10... Band guide arch, 11... Arch cover, 12, 12... Rod, 14, 15... Bracket, 16... Guide plate, 20... Arch guide, 23... Opening surface, 37... Sliding member , 40... Solenoid, 42... Rod, 43
... Support piece, 47 ... Operating rod, 50 ... Camshaft,
51... cam, 52... cam follower.

Claims (1)

[Scope of utility model registration request] A series of arch guides forming a band passageway with one side open are molded, with both ends facing the band welding mechanism. In a band guide arch for a packaging machine having means for forcibly expanding the vicinity of a corner portion on the band entrance side of the arch guide, the arch guide is suspended and supported by a rod so as to be horizontally movable, and the maximum straight line of the arch guide is A support piece rotatable by a solenoid is provided at an appropriate position on the back surface opposite to the opening surface of the part so as to be able to freely move toward and away from the back surface, and a spring is provided for biasing the support piece in a direction toward or away from the back surface. An arch guide support device characterized by being attached.