JP3731973B2 - Banding device for packing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic packing machine that winds the outer periphery of various objects to be packed using a band of thermoplastic synthetic resin, and sends the band into an arch on a table and tightens the object to be packed by tightening the band. It relates to a mobile device.
[0002]
[Prior art]
As is generally known, an automatic packing machine that winds the outer periphery of an object to be packed using the above-mentioned band has an arch standing on a table that houses the main mechanism of the packing machine, and the band pulled out from the reel is arched. When the start switch is turned on with the object to be packed placed in the arch on the table, the band clamped on the tip side is tightened, and the part detached from the arch tightens the outer periphery of the object to be packed Thereafter, the clamping process of the overlapping portion of the band, the cutting in the middle of the band, and the welding process by heating and pressurizing the band facing surface are sequentially performed.
[0003]
In such an automatic packing machine, a conventional band moving device that supplies the band into the arch and tightens the band includes a pinch roller and a spring and solenoid that are pressed against a feed roller that is driven to rotate forward and backward at a fixed position. When the band is fed into the arch, the band is sandwiched between the feed roller and the pinch roller by the spring force, and the feed roller is rotated in the feed direction.When tightening, the feed roller is reversed and the pinch roller is The object is pressed by a solenoid, and the band is tightened by increasing the band clamping force.
[0004]
By the way, as the packing band, a band having a different thickness is used according to the condition of the object to be packed, and the band feeding step into the arch is preferably performed under a condition according to the thickness of the band.
[0005]
[Problems to be solved by the invention]
However, the conventional band moving device can only select a pinch roller pressure between a spring and a solenoid. For example, when a very thin band is fed or when a band is fed into a large arch, the band travels in the arch. When a slight impact or the like occurs, stress concentrates in the vicinity of the feed roller of the band, and there is a problem that the band breaks down and cannot be loaded into the arch.
[0006]
Therefore, the problem of the present invention is that, in the band feeding process into the arch, according to the conditions such as the strength of the band and the arch length, by adjusting the pressure of the pinch roller, it is possible to avoid the occurrence of waist folding of the band, An object of the present invention is to provide a band moving device for a packing machine capable of obtaining a sufficient tightening force during a tightening process.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the invention of claim 1 is arranged such that a pinch roller capable of approaching and separating can be arranged outside the feed roller driven at a fixed position, and can be moved up and down near the feed roller. The above-mentioned pinch roller is held by a vertically elongated hole of the elevating member arranged so that a tension spring is applied between the elevating member and the pinch roller to apply a preload in the direction in which the pinch roller is pressed against the feed roller. The elevating member is fed by pushing the pinch roller at the lower end of the long hole and pushing the pinch roller away from the feed roller to urge movement elasticity toward the raised position, and pulling down the pinch roller at the upper end of the long hole And a solenoid that pulls down to a lowered position that is in pressure contact with the roller, and a mechanism for limiting the downward movement of the elevating member by this solenoid. The faces, in which said pinch roller is adopted a structure in which to be able to regulate the position for pressing the feed roller with a pressure of a tension spring.
[0008]
The invention of claim 2 is the invention of claim 1, wherein the tension spring is stretched between a shaft that supports the pinch roller and a tension adjusting screw that is attached to the elevating member so that the vertical position can be freely adjusted. The configuration is such that the pressure can be adjusted.
[0009]
According to a third aspect of the present invention, in the first aspect of the invention, the restricting mechanism for restricting the downward movement amount of the elevating member is located within the trochanter provided on the elevating member and the vertical movement range of the trochanter, and is lowered. The structure is formed of a rotating cam having a large diameter portion that supports the trochanter and prevents the descending and a small diameter portion that allows the descending trochanter to pass.
[0010]
Here, when the band is fed into the arch, the sensor detects that the band has been fed to the entire length of the arch, and this sensor cuts off the energization of the solenoid, and the pinch roller is released by pushing up the pressure release spring. To position.
[0011]
Further, the band pressing force of the pinch roller at the time of feeding the band is performed by adjusting the tension spring, and the force at the time of tightening the band can be performed by changing the voltage when the solenoid is energized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 shows an overall schematic structure of an automatic packing machine, in which an arch 2 that is partially cut off is erected on the upper surface of a table 1, and the band A is fed into the arch 2 and the band inside the table 1. A band moving device 3 for tightening A and a welding mechanism 4 for clamping, cutting and welding the band A are provided.
[0014]
The band moving device 3 loads the band A pulled out from the reel over the entire length of the arch 2, and when the tip reaches the tip detection sensor 5 of the welding mechanism 4, the feeding is stopped by the operation of the sensor 5, and the start switch is turned on. The banding mechanism A is tightened with the first clamp 6 that holds the tip end side of the band A with the slide substrate, and the tip end of the band A is held in an overlapping manner after the band A is tightened. The second clamp 7 that cuts the middle of the band A and the pressurizer 8 that crimps the portion whose opposite surface is heated and melted by the heater, and these are moved up and down at the same timing by the cam mechanism 9. Is granted.
[0015]
2 to 4 show a specific structure of the band moving device 3. The feed roller 10 disposed at a fixed position is driven to rotate forward and backward by a motor, and the pinch roller 11 is positioned above the feed roller 10. The elevating member 12 is disposed at a position facing the end surface of the feed roller 10.
[0016]
The pinch roller 11 is rotatably supported by a shaft 15 at the tip of an arm 14 that can swing about a pivot 13 attached to a fixed portion, and can move toward and away from the feed roller 10. When the band A is sandwiched between the pinch rollers 11, the band A can be fed out and tightened.
[0017]
The elevating member 12 is formed of a vertically long plate, and its lower end is connected to a plunger 18 of a solenoid 17 fixed to a fixed portion via a bracket 16 so that it can move up and down integrally with the plunger 18. Elasticity to move to the raised position is given by a pressure release spring 19 which is contracted between the part and the solenoid 17.
[0018]
The shaft 15 of the pinch roller 11 is held by a vertically long hole 20 provided at the upper end of the lifting member 12, and the vertical movement of the pinch roller 11 is restricted by the long hole 20 and attached to the lower part of the lifting member 12. A tension spring 22 is provided between the tension adjusting screw 21 and the shaft 15 so as to apply a preload in a direction in which the pinch roller 11 is always pulled down and pressed against the feed roller 10.
[0019]
The tension adjusting screw 21 is attached to a portion of the vertical hole 23 provided in the elevating member 12 using a nut 24, and the pinch roller 11 is fed to the feed roller by adjusting the vertical position within the range of the long hole 23. The pressure of the tension spring 22 pressed against the pressure 10 can be changed.
[0020]
A restricting mechanism 25 is provided at a position on the lower side of the elevating member 12 to restrict the downward movement amount of the elevating member 12 pulled down by the solenoid 17. The restricting mechanism 25 is attached to a lower side surface of the elevating member 12 so that a trochanter 26 using a bearing is integrally moved up and down by a pivot 27, and a cam 28 that rotates at a fixed position in the middle of the vertical movement range of the trochanter 26. Is arranged.
[0021]
The cam 28 is fixed to the camshaft 28a, supports a descending trochanter 26 and prevents the elevating member 12 from descending, and a small-diameter portion 30 that allows the descending trochanter 26 to pass. And. The cam 28 may be driven using the same drive source as the cam mechanism 9 or an independent drive source.
[0022]
Here, the relationship between the raised position of the elevating member 12 and the long hole 20 and the cam 28 provided in the upper part is shown below.
[0023]
When the solenoid 17 is de-energized, the elevating member 12 reaches the highest position when the pressure release spring 19 is pushed up, and the pinch roller 11 is pushed away from the feed roller 10 via the shaft 15 at the lower end of the long hole 20. And
[0024]
When the elevating member 12 is lowered by energization of the solenoid 17, when the descender stops when the trochanter 26 comes into contact with the large diameter portion 29 of the cam 28, the shaft 15 of the pinch roller 11 pressed against the feed roller 10 is stopped. The middle part of the long hole 20 is positioned, and the pinch roller 11 is brought into pressure contact with the feed roller 10 only by the pressure of the tension spring 22.
[0025]
If the small diameter portion 30 of the cam 28 faces the trochanter 26 when the elevating member 12 is lowered by energizing the solenoid 17, the elevating member 12 is not restricted from being lowered, and the elevating member 12 is at the lowest position. Thus, the pinch roller 11 is pulled down via the shaft 15 at the upper end of the long hole 20, and the pulling force of the solenoid 17 directly becomes the pressure contact force of the pinch roller 11 to the feed roller 10. Note that the pulling force of the solenoid 17 can be changed by controlling the applied voltage.
[0026]
The present invention is configured as described above, and the operation thereof will be described next.
[0027]
Band feeding process When all the packing processes are completed and the band A is fed into the arch 2, the phase where the large-diameter portion 29 of the cam 28 faces the movement range of the trochanter 26 becomes a phase. While the band A is positioned between the pinch rollers 11, the solenoid 17 is energized and the feed roller 10 rotates in the direction of feeding the band A.
[0028]
With the lowering by the solenoid 17, the elevating member 12 descends, the trochanter 26 comes into contact with the large-diameter portion 29 of the cam 28 and stops descending, and the shaft 15 of the pinch roller 11 that presses against the feed roller 10 is stopped. As shown in FIG. 3, the long hole 20 has an intermediate portion that is not involved in pulling down. The pinch roller 11 presses the band A against the feed roller 10 only by the pressure of the tension spring 22, and enters the arch 2 through the guide 31. Send A.
[0029]
Therefore, the band A is fed into the arch 2 by feeding the band A sandwiched between the feed roller 10 and the pinch roller 11 only with the pressure of the tension spring 22, and the pressure of the tension spring 22 is adjusted to the thickness and material of the band A. If it is adjusted in advance according to the above conditions, a stable feeding of the band A can be obtained.
[0030]
When the band A is loaded over the entire length of the arch 2 and the sensor 5 detects the tip of the band A, the feeding of the band A is completed and the energization to the solenoid 17 is cut off. As a result, the pull-down force of the elevating member 12 by the solenoid 17 is released, the elevating member 12 is pushed up to the raised position by the elasticity of the pressure release spring 19, and the pinch roller 11 is instantly raised to release the band A. Then, the feeding of the band A is stopped.
[0031]
Further, the cam shaft 28a is rotated by a predetermined angle by the detection signal at the tip of the band A by the sensor 5, and the cam 28 stands by in a phase where the small diameter portion 30 faces the trochanter 26 side.
[0032]
Band winding process When an object to be packed is placed on the table 1 and the start switch is turned on, the end of the band A is held by the operation of the welding mechanism 4, and then the feed roller 10 is rotated in the band winding direction. At the same time, the solenoid 17 is energized, and the elevating member 12 is pulled down.
[0033]
Since there is a gap between the trochanter 26 and the small-diameter portion 30 of the cam 28 when the elevating member 12 is lowered, the elevating member 12 is pulled down to the lowest position, whereby the pinch roller 11 is moved at the upper end of the long hole 20. The band A is pressed against the feed roller 10 and clamped, and the pulling force of the solenoid 17 directly becomes the clamping force of the band A, and the band A is pulled back with a strong force by the rotation of the feed roller 10 in the band winding direction. The band A is detached from the arch 2 and tightens the outer periphery of the object to be packed.
[0034]
When band A winds the outer periphery of the object to be packed, the feed roller 10 is stopped, and the welding mechanism 4 operates to sequentially perform the band A clamping, cutting, and heat welding processes. Is removed, the solenoid 17 is de-energized, the elevating member 12 moves to the highest position, the pinch roller 11 is pushed up to release the band A, the cam shaft 28a rotates by a predetermined angle, and the cam 28 Becomes a phase in which the large diameter portion 29 faces the trochanter 26 side, and thereafter, the process proceeds to the band feeding step described above.
[0035]
【The invention's effect】
As described above, according to the present invention, when the band is loaded into the arch, when the band is loaded over the entire length of the arch, the pinch roller is separated from the feed roller. The band can be prevented from bending, and when the band is tightened, the pulling force of the solenoid becomes the direct tightening force, and a tightly tightened state can be obtained with respect to the package.
[0036]
In addition, when the band is fed into the arch, the band is clamped only by the tension spring pressure. By adjusting the tension spring pressure, the band clamping force of the feed roller and the pinch roller during band feeding can be reduced by the thickness of the band. It is possible to set the optimum conditions according to the material and material, etc., so that the band can be surely fed, and the band can be prevented from being folded.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a structure of an automatic packing machine. FIG. 2 is a perspective view showing a band moving device of the automatic packing machine. FIG. 3A is a front view showing a state of a band feeding process of the band moving device. , (B) is a longitudinal side view of the same. FIG. 4 is a longitudinal side view showing the state of the band tightening process of the band moving device.
DESCRIPTION OF SYMBOLS 1 Table 2 Arch 3 Band moving device 4 Welding mechanism 5 Tip detection sensor 10 Feed roller 11 Pinch roller 12 Lifting member 15 Shaft 17 Solenoid 19 Pressure release spring 20 Long hole 21 Tension adjusting screw 22 Tension spring 26 Trochanter 28 Cam 29 Large diameter Part 30 Small diameter part

Claims (3)

A pinch roller that can move toward and away from the feed roller driven at a fixed position is arranged, and the pinch roller is installed in a vertically long slot of an elevating member arranged to be able to move up and down near the feed roller. A tension spring is applied between the elevating member and the pinch roller to apply a preload in a direction in which the pinch roller is pressed against the feed roller, and the elevating member is fed by pushing up the pinch roller at the lower end of the long hole. There are provided a pressure release spring that urges the moving elasticity toward the ascending position to be separated from the roller, and a solenoid that lowers the pinch roller at the upper end of the long hole and lowers it to the descending position to press the feed roller. A mechanism for limiting the downward movement of the elevating member by the solenoid, the middle of the long hole faces the pinch roller, and the pinch roller is moved by the tension spring pressure. Band mobile device and the packing machine to be able to regulate the position for pressing the Dorora. 2. The packaging machine according to claim 1, wherein the tension spring is stretched between a shaft that supports the pinch roller and a tension adjusting screw that is attached to the elevating member so that the vertical position can be freely adjusted, thereby adjusting the pressure. Band moving device. A restricting mechanism that regulates the downward movement amount of the elevating member is a trochanter provided on the elevating member, and a large diameter portion that is located within the vertical movement range of the trochanter and supports the descending trochanter to prevent the lowering The band moving device for a packing machine according to claim 1, wherein the band moving device is formed by a rotating cam having a small-diameter portion that allows passage of the descending trochanter.

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