JP3044132B2 - Band bonding method and apparatus for packing 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 method and an apparatus for bonding a packing machine, and more particularly to a method and apparatus for controlling a band cooling time of a secondary press in a step of welding a band overlapping portion.

[0002]

2. Description of the Related Art As shown in FIGS. 8 to 10, a control device for a packing machine includes an output shaft 2 of a speed reducer 31 connected via an electromagnetic brake to a cam shaft motor connected to a control circuit (not shown).
Frame 3 in which camshafts 4 that are directly connected to are arranged at appropriate intervals.
4a and 34b, and a plurality of cams 35
Each press member 6 provided between the machine frames 34a and 34b and the band guide 7 and the slide table 8 on each press member 6 are attached so as to perform a predetermined action by the rotation of the cam shaft 4 and the speed is reduced. A limit cam 41 is attached to a limit cam shaft 80 extending from the output shaft 2 of the machine 31 in a direction opposite to the machine frame 34a by fixing a convex portion of the limit cam 41 with a screw so that the position of the limit cam 41 can be adjusted. The limit switches L3, L1, L are respectively set at positions where the rods are pushed in by the convex portions of the cams 31a, 31b, 31c.
2 is attached and configured via a bracket 45.

When the start switch (not shown) is turned on in the state shown in FIG. 8 in which each member is at the original position, the camshaft motor starts to rotate, and the camshaft 4 and cam 35
Rotates, the right presser 81 in the press member 6 rises, grasps the tip of the band between the slide table 8, and at the same time, the band guide 7 and the left bandway flap 42 are completely retracted (rear side in FIG. ). Here, the limit switch L is moved by the limit cam 31b which rotates synchronously with the camshaft 4.
1 is turned on to generate a reverse rotation signal, and the camshaft motor is stopped by the reverse rotation signal of the limit switch L1.

Referring to FIG. 10, a forward rotation roller 20 facing a band shooter 1 and forming a feed roller at a predetermined interval.
And a reverse rotation roller 10 serving as a return roller is disposed. A forward rotation motor 36 is directly connected to the drive shaft 21 of the forward rotation roller 20, and the gear 19 provided on the drive shaft 21 is connected to the reverse rotation roller 1.
It meshes with a gear 38 having a larger diameter than the gear 19 provided on the 0 shaft 11. Therefore, the forward rotation roller 20 and the reverse rotation roller 10 are always rotating in opposite directions.

[0005] Reference numerals 23 and 13 denote forward and reverse rotation touch rollers, which are rocker rollers.

Reference numeral 51 denotes a tightening roller, a part of the circumference of which faces the rear end of the band shooter 1, and the drive shaft 22 is directly connected to a tightening motor 39 which is a gear motor with a brake attached to the back surface of the substrate 5. ing. This tightening roller 51
Is a large-diameter roller in which an elastic body having a large frictional resistance such as urethane is adhered to the outer periphery of a metal roller. A cut is made at the center in the width direction of the outer peripheral surface formed of the elastic body 53, and the elastic body 53 Also, an annular member 46 made of a material having a low frictional resistance and high hardness, for example, a Teflon (coating) thrust washer is buried. 2
Project 0.3 mm.

Reference numeral 54 denotes a tightening touch roller, which is an eccentric shaft 5.
8, the other end of a crank 57, one end of which is connected to a rod 56 of a solenoid 55 to which a timer T1 is connected, is connected to the tip of an eccentric shaft 58, and the outer periphery of the tightening touch roller 54 is tightened by the expansion and contraction of the rod 56. The outer periphery is configured to be freely pressed and separated. 59 is a guide shooter.
A part of the outer circumference of the tightening roller 51 is covered with a band passing gap, and one end is attached to the rear end of the band shooter 1 with the other end facing a part of the outer circumference of the tightening touch roller 54. The set time of the timer T1 is set as a time required for further tightening (secondary tightening) the band wound around the article to be packed.

[0008] Therefore, the reverse rotation touch roller 13 is pressed against the reverse rotation roller 10 by the reverse rotation signal of the limit switch L1 and the band is pulled back (primary tightening), and the band escapes from the band guide arch on the packing machine main body, and is packed. Wrap around things. This reverse rotation is arbitrarily set by a set time of a timer operated by a reverse rotation signal of the limit switch L1. After the set time of the timer, the reverse rotation touch roller 13 separates from the reverse rotation roller 10. At the same time, the solenoid 55 is excited via the timer T1, the touch roller 54 on the eccentric shaft 58 is pressed against the tightening roller 51 via the crank 57, and the band is tightened within the set time of the timer T1.
After the time of the timer T1, the camshaft rotates again and the reverse rotation of the motor 52 stops, so that the limit cam 31b on the limit camshaft 80 interlocking with the camshaft 4 also rotates, and the convex portion of the limit cam 31b moves to limit switch. L1 is turned off. Then, the left presser 83 in the press member 6 on the cam 35
Grips the band supply end side, a heater (not shown) on the heater crank 18 is inserted into the band overlap portion,
Rises, and the cutter lower blade provided on the intermediate presser 82 cuts the band supply end side straight and smoothly between the upper edge of the band passing hole 85 of the right presser 81 and the cutter upper blade. The overlapping portion is pressed and melted together with the heater and melted (primary pressing step). Then, the intermediate presser 82 is lowered once, the heater is pulled out, the intermediate presser 82 is raised again, and only the overlapping portion of the band is pressed for a certain time. 8 (secondary pressing step), the slide table 8 is retracted so that the articles to be packed can be taken out. Then, the band guide 7, the slide table 8 and the left bandway flap 42 are returned to the original positions in FIG. The member returns. At this time, the limit cam 31c on the limit cam shaft 80 is also rotating, and the limit switch L2 is turned ON by the limit cam 31c at the same time when the members return to the previous position, and a forward rotation signal is generated. The band is supplied to the outside of the main body by pressing against the normal rotation roller 20 via the band. The rotation time of the motor is also controlled by a timer, and is set slightly longer than the full length of the arch. The limit switch L2 only outputs the forward rotation start signal, and the camshaft 4 continues to rotate.
The limit switch L3 is turned ON by the limit cam 31a on the limit cam shaft 80, and the cam shaft is stopped by this original position signal. During this time, the band is supplied to the band guide arch on the main body by the normal rotation of the normal rotation roller 20, and the tip of the band reaches below the slide table 8.

As described above, one rotation of the cam shaft is one packing process, and the start / end signals from the previous process to the next process are transmitted to the cam shaft 4.
Limit cam 3 on limit cam shaft 80 that rotates synchronously with
1a, b, c and limit switches L associated therewith
1, L2, and L3.

[0010]

The packing time is reduced to one tenth.
In the market demand for high-speed packing that competes for seconds, it is necessary to increase the rotation speed of the cam shaft 4 in order to shorten the packing time. For this reason, there was a problem that the time required for the secondary press was not sufficient, the process proceeded to the next step before the adhesion of the band overlap portion was sufficiently hardened, and the band adhesion portion was peeled off due to the tension of the band.

Incidentally, while the time required for one rotation of the camshaft 4 is 0.66 seconds, the time required for the secondary press is very short, 0.11 seconds.

The band-bonded portion peeling phenomenon is related to the strength of the band tightening force in the secondary tightening. The band-bonded portion peeling does not occur when the band is weakly tightened, but may occur when the band is strongly tightened. Further, even if the time of the secondary press is extended, if it is extended more than necessary, it becomes a serious problem today that high-speed packing is required, which requires one tenth of a second in one packing time.

SUMMARY OF THE INVENTION The present invention has been developed to solve the above-mentioned problems, and provides a band bonding method and a band bonding apparatus for shortening the packing time as much as possible and preventing the band bonding portion from peeling off. It is an object.

[0014]

In order to achieve the above object, in the bonding method and apparatus for a packing machine according to the present invention, after gripping the tip of a band supplied outside the main body and performing primary tightening, This band is subjected to secondary tightening by the tightening force adjusting means with an arbitrary tightening force, and then the tightened band supply end is gripped, and a heater (not shown) is inserted between the band overlapping sections to apply heat. In the packing step of bonding the band overlapping portion in the primary pressing step of pressure melting and the secondary pressing step of pressing and bonding the melted band overlapping portion, the band tightening force by the tension volume as the tightening force adjusting means. And the secondary press process time is increased in direct proportion to the set tightening value.

When the tightening force of the band by the tension volume as the tightening force adjusting means is set to a value equal to or higher than a standard tightening value, the secondary pressing step is carried out by a predetermined standard cooling time which increases in direct proportion to the set value. The cooling is performed as described above.

Further, a plurality of press members 6 provided on the cam shaft 4 and a band supply and tightening mechanism required for packing, a gripping mechanism for the band tip and supply end, a cutting mechanism for the band supply end, and a band overlapping section are required. A bonding mechanism for a band overlapping portion is provided, comprising a primary pressing step of inserting a heater to melt under pressure and a secondary pressing step of pressing and bonding the melted band overlapping portion, and the band supplied outside the main body. In a packing machine provided with a tightening force adjusting unit that adjusts a tightening force of a band that grips a leading end of the band by the gripping mechanism and tightens the band to the object to be packed,
On the camshaft 4, one disk 70 having a plurality of detected parts provided on the outer circumference is fixed, and a sensor 77 for detecting the detected part is provided facing the outer circumference of the disk 70. The detection signal of the sensor 77 is supplied to a control circuit unit 111 to generate a drive control signal based on the signal, and the drive control signal is transmitted from the control circuit unit 111 to a drive circuit 118 that controls the rotation of the cam shaft. 119 is output. Further, a control is performed by forming a detected portion 75 for detecting one of the plurality of detected portions during the secondary pressing step, and inputting a set value of a band tightening force by a tension volume as the tightening force adjusting means. In the section, corresponding to this set value,
A signal for stopping the camshaft 4 in the secondary press step is output to a drive circuit of the camshaft for a time that increases in proportion to the set value. Further, when the set value of the band tightening force by the tension volume as the tightening force adjusting means is set to a standard set value or more, by the detection signal of the sensor 77 that has detected the detection target portion 75 that detects the secondary pressing process, The rotation of the camshaft is stopped to cool the secondary pressing step for a predetermined standard cooling time or more according to the set value.

Further, the detected part has a plurality of detection holes 71, 72, 73, 74, 7 formed in the outer periphery of one disk 70.
The sensor 77 is composed of two microphoto sensors.

Further, the plurality of detection holes 71, 72, 7
3, 74, 75 and 76 are one micro photo sensor 7
5 detection holes 71, 7 forming a gap capable of receiving light 7
2, 73, 74, 75, and one detection hole 76 forming a gap capable of receiving the two microphotosensors 77, 77 at the same time.

[0019]

The disk on the camshaft, which acts on each of the press members, rotates corresponding to each operation of the band tip gripping mechanism and the like constituted by each of the press members. The detected portion is sequentially detected by the sensor, and the control circuit unit which has input the detection signal corresponds to the set value of the band tightening force by the tension volume as the tightening force adjusting means, for example, the tightening force is set to a standard tightening value. When the above setting is made, the secondary press step is cooled in a directly proportional manner over a predetermined standard cooling time in accordance with the set value. Therefore, when the band tightening force is weaker than the standard tightening force, the band bonded portion is cooled in the minimum secondary press time for cooling in the standard cooling time, and when the band tightening force is higher than the standard tightening value, the tightening force is reduced. The band bonding part is cooled by a longer secondary press time as the value of the band becomes stronger, but this secondary press time is the minimum time during which the band bonding part does not peel.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiment, omitting parts similar to those of the prior art.

1 and 2, a disk 70 is attached by wedge to a limit cam shaft 80 extending from the output shaft 2 of the speed reducer 31 in the opposite direction of the machine frame 34a (FIG. 8). For example, six detection holes 71 to 76, which are detected portions, are formed at predetermined intervals on the outer periphery of. Each detection hole 71
76 are provided at appropriate positions on the circumference of the disk 70 in order. The detection hole 71 is formed at a substantially intermediate position between the detection hole 72 and the detection hole 76 by cutting out the disk 70 slightly longer than the other detection holes 72 to 76. In the illustrated embodiment, the camshaft 4 is fixed to the end of a limit camshaft 80 extending in the direction opposite to the machine frame 34a from the output shaft of the speed reducer having the electromagnetic clutch and the electromagnetic brake 9.

In FIGS. 1 and 2, reference numeral 77 denotes, for example, a photo sensor, which comprises two sensors arranged side by side or one sensor having two light sources, and is bent in an L-shape provided on the side surface of the speed reducer 31. It is attached to the bent piece of the formed bracket 78 and attached to a position where the light source faces the detection holes 71 to 76 of the disk 70 in FIG.

Next, the circuit configuration will be described with reference to the block diagram of FIG.

The photosensor 77 is connected to the detection circuit 110. When the photosensor 77 receives light when the detection holes 71 to 76 are detected by the photosensor 77, the detection circuit 110
From the control circuit unit 11
1 is supplied to the counter 112.

The control circuit unit 111 includes a control unit 113, the counter 112, the timers 114 (T1), 115
(T2) and a drive control signal transmission unit 116.
The control unit 113 to which the output of the counter 112 is input controls the timers 114 and 115 and the drive control signal transmission unit 116 based on the detection timing of the detection holes 71, 75 and 76. The detection signal detected by the detection circuit 127 is supplied to the control unit 113 for the set time T1 of the timer 114, and the detection of the detection hole 75 is larger or smaller than the standard set time T0 set in the control unit 113 in advance. Based on the timing, the timer 115 and the drive control signal transmitting unit 11
6 is controlled. The detection circuit 127 also receives a detection signal of the rotation speed reduction detecting means L5 of the reverse rotation touch roller 13.

Driving circuit 1 for camshaft electromagnetic clutch 117
18, a drive circuit 119 for the camshaft electromagnetic brake 9, and a drive circuit 120 for the solenoid 87 of the reverse rotation touch roller 13 are connected to the drive control signal transmission unit 116, and a drive circuit 121 for an electromagnetic clutch of the tightening roller 51 described later; Drive circuit 122 for solenoid 55 of tightening touch roller 54, drive circuit 124 for solenoid 27 for forward rotation touch roller
Are similarly connected to the drive control signal transmission unit 116.

A start switch 125 and a preparation lamp 126 for displaying a preparation completion state are connected to the control unit 113.

Here, the control circuit section 111 may be configured by mounting individual components such as an IC on a substrate, or may be configured by using a microprocessor (CPU), an input / output interface, or the like.

According to the above configuration, the detection holes 71 to 71
76 is a detection hole 71 by a photo sensor 77, respectively.
When two light sources are received, the detection hole 72 detects the completion of the gripping and fixing of the band tip with the original position signal indicating that the press member or the like is in the state of FIG.
Reverse rotation signal for performing secondary tightening), the detection hole 73 is
The stop signal of the left presser 83 for stopping the rotation of the cam shaft 4 at a position having a small gap between the leading end and the slide table 8 at which the band can pass through the band exceeding the thickness of at least one band, and the detection hole 74 is the band supply end. After completion of the gripping and fixing of the band, a tension release for cutting the band supply end side is released. A release signal is released to release the excitation by the solenoid 55 described later and release the pressing of the tightening touch roller 54 to the tightening roller 51. The detection hole 75 detects that it is in the secondary pressing step of pressing only the melted band overlapped portion between the slide table 8 and the intermediate presser 82, and the set time T of the timer 114 is detected.
If T1> TO by the arithmetic processing of 1 and the standard set time T0, the rotation of the camshaft 4 is stopped for the set time and converted into a secondary press step, that is, an adhesive extension signal for extending the adhesive time.
After the band is welded and packed, the detection holes 76 are respectively detected by receiving only one light source of the photosensor 77 as a packing completion signal for supplying the band to the outside of the packing machine main body.

Here, the OFF signal is output to the drive circuit 118 of the camshaft electromagnetic clutch 117 and the ON signal is output to the drive circuit 119 of the electromagnetic brake 9 according to the original position signal generated by the control circuit section 111. After completion, the preparation lamp 126 is turned on.

The drive circuit 1 for the solenoid 87 of the reverse rotation touch roller 13 according to the reverse rotation signal from the detection hole 72
20 is an ON signal, a detection signal for detecting a decrease in the number of rotations of the reverse rotation touch roller 13 of the rotation number detecting means L5, an ON signal to a drive circuit 122 of the solenoid 55 of the tightening touch roller 54, and an electromagnetic clutch driving circuit 121 of the tightening roller 51. To O
N signals are output. Also, the camshaft electromagnetic clutch 117 is actuated by the left presser stop signal from the detection hole 73.
, And an ON signal is output to the drive circuit 119 of the electromagnetic brake 9.

An OFF signal is output to the drive circuit 122 of the solenoid 55 and an OFF signal is output to the drive circuit 120 of the solenoid 87 in response to the release signal from the detection hole 74.

When the control unit 113 receives the signal from the detection hole 75 and the set time T1 of the timer 114 is longer than the standard set time T0, the bonding time is extended to the drive circuit 118 of the camshaft electromagnetic clutch 117. An ON signal is output to the drive circuit 119 of the electromagnetic brake 9 together with the signal for stopping the rotation of the cam shaft for a set time.

That is, the time T2 of the timer 115 changes in proportion to the magnitude of the set time T1, and after the elapse of the time T2, the drive circuit 1 of the camshaft electromagnetic clutch 117
18 is a rotation signal, and O of the drive circuit 119 of the electromagnetic brake 9 is
An FF signal is output. On the other hand, when the set time T1 of the timer 114 is smaller than the standard set time T0, the drive circuit 118 of the camshaft electromagnetic clutch 117 and the electromagnetic brake 9
No signal is output to the drive circuit 119, and the camshaft 4 continues to rotate.

As shown in FIGS. 6 and 7, the band shooter forming a band passing path comprises a return shooter 1, a tension shooter 59 and a feed shooter 30, and the band shooter faces the band passing path 41a in the return shooter 1 and pulls back the band. A reverse rotation roller 10 serving as a return roller rotating in the direction of action and a reverse rotation touch roller 13 as a touch roller slidably in contact with the reverse rotation roller 10 and rotatably driven are provided so as to be freely pressed and separated.

The drive shaft 11 of the reverse rotation roller 10 has a shaft end protruding from the rear surface of the substrate 5 and a pulley 12a for a flat belt is wedge-fitted to the shaft end of the drive shaft 11, as shown in FIG. A flat belt is provided on a pulley 12b provided on an input shaft of a camshaft reduction device 44 for driving a camshaft 4 for operating a known right presser 81, a heater (not shown), a center presser 82, a left presser 83, a center press, and the like. 14, the reverse rotation roller 10 is constantly rotating. The input shaft is a belt 4
7 is connected to a motor (not shown) on the right side of FIG. 7 via a camshaft 3, and the camshaft 4 includes a camshaft electromagnetic clutch (reference numeral 117 in FIG. 3) provided on the input shaft, and an electromagnetic brake (reference numeral 9 in FIG. 3). ) Controls the rotation.

The reverse rotation touch roller 13 has an eccentric shaft 86.
U is provided with one end of an operating rod 90 fixed to the rear end of the shaft 86 with a bolt, and the other end of the operating rod 90 provided on a connecting piece 95.
The connecting piece 95 is loosely fitted in the U-shaped groove portion 92 and is connected to the operating rod 90 by a split pin 96. The upper end of the interlocking rod 91 is screwed to the lower end of the connecting piece 95, and the lower end of the interlocking rod 91 is
One end of the arm rod 98 is rotatably provided at a fulcrum 97 on a bracket 99 below the substrate 5.
8 having the other end provided on the bracket 99.
Of the rod 88. The lower end of the interlocking rod 91 is urged via a spring 94 in a direction in which the reverse rotation touch roller 13 is always separated from the reverse rotation roller 10. Note that a compression spring may be built in the connection piece 95, or the operating rod 90 and the interlocking rod 91 may be connected by a tension spring.

Further, a pulley 67b is provided through another electromagnetic clutch for tightening rollers which is provided coaxially with the input shaft of the camshaft reducer 44 coaxially with the pulley 12b. The tightening roller 51 serving as a return roller is a drive shaft 22 of a tightening speed reducer 52.
The pulley 67b is connected to a pulley 67a attached to the rear end of the pulley 67 via a V-belt 68 and is driven to rotate (FIG. 7).

The tension roller 51 is a large-diameter roller in which an elastic body 53 having a high frictional resistance such as urethane is adhered to the outer periphery of a metallic roller. The roller 54 is provided so as to be capable of being pressed and separated.

As shown in FIG. 6, the tightening touch roller 54 is attached to a shaft 58 of an arm rod 57 having one end rotatably connected to the substrate 5 by a shaft 66, and the other end of the arm rod 57 is connected to a solenoid 55. The outer periphery of the tightening touch roller 54 is configured to be able to be pressed against and separated from the outer periphery of the tightening roller 51 by expansion and contraction of the rod 56.

The tension shooter 59 includes the tightening roller 5.
1 is formed by providing a band passage 41b forming an allowable band passage gap, one end of which is formed at the rear end of the return shooter 1 and the other end is formed of the tightening touch roller 54.
The lower end of the tension shooter 59 is engaged with the arm rod 57 by pins 60 and 60 so as to be movable up and down in conjunction with the sliding movement of the arm rod 57.

Further, the tension shooter 59 is provided with a long hole 61 as a vertically long guide groove, and a guide pin 62 projecting from a reinforcing plate 63 attached to the surface of the substrate 5 is inserted into the long hole 61. I do. The tension shooter 59 is guided by a guide pin 62 and moves up and down in conjunction with the swinging movement of the arm rod 57 due to the expansion and contraction of the rod 56 of the solenoid 55. That is, the arm rod 57 is usually
As shown by the solid line in FIG. 6, the tightening touch roller 54 is positioned below the sheet of FIG. 6 in contact with the tip of the stopper 64 provided on the bracket 65, and is separated from the tightening roller 51.

The tension shooter 59 interlocking with the swinging movement of the arm rod 57 is located at the position indicated by the solid line in FIG. 6, and the upper end edge of the band exit of the band passage 41b between the tension shooter 59 and the tightening roller 51 is the band of the return shooter 1. The lower end of the supply band is located below the upper edge of the band entrance (the opening behind the band supply direction: the same applies hereinafter) of the passage 41a, and the leading end of the supply band is located at the band outlet (the opening ahead of the band supply direction: the same applies hereinafter) of the band passage 41b. It is formed so that it is smoothly and reliably fed into the band entrance of the band passage 41a.

When the solenoid 55 is excited and the rod 56 slides the arm rod 57 upward in FIG. 6 so that the tightening touch roller 54 comes into pressure contact with the tightening roller 51 and pulls the band back, the tension shooter 59 moves the arm rod 57. To move upward, and the band passage 41b of the tension shooter 59
Moves upward from the band entrance at the rear end of the band passage 41a of the return shooter 1 as shown by the two-dot chain line in FIG. 6, and the size of the band exit of the band passage 41b is equal to the band passage of the return shooter 1. The passage 41a is formed to be larger than the band entrance.

In FIG. 6, reference numeral 20 denotes a forward rotation roller which is supported on the substrate 5 by a drive shaft 23. A band outlet of the pool box faces a part of the outer periphery of the forward rotation roller 20. Then, a forward rotation touch roller 21 slidably in contact with the forward rotation roller 20 and driven to rotate is provided so as to be able to press and separate freely. The drive shaft 23 of the forward rotation roller 20 has a shaft end protruding from the rear surface of the substrate 5, and as shown in FIG. 7, a pulley 12 c for a flat belt is wedged to the shaft end of the drive shaft 23, and the pulley 12 c Flat belt 1 wound around pulley 12a of reverse rotation roller 10 described above.
4 and is driven to rotate in the same direction as the pulley 12a, that is, in the band supply operation direction.

The forward rotation touch roller 21 is supported by the tip of an eccentric shaft 24, and the rear end of the shaft 24 is fixed with a bolt near the bent portion at the center of an L-shaped operating rod 25. Is urged by a spring 26 so that the forward rotation touch roller 21 rotates in the direction of pressing against the forward rotation roller 20,
The other end of the operating rod 25 is connected to the end of the rod 28 of the solenoid 27. While the solenoid 27 is being excited, the forward rotation touch roller 21 is rotated by the forward rotation roller 2 against the spring 26.
When the excitation is released, the rod 28 rotates the operating rod 25 by the biasing force of the spring 26 so that the eccentric shaft 24 is pressed against the normal rotation roller 20 by the normal rotation touch roller 21.

Reference numeral 41c denotes a band passing path, which is constituted by the feed shooter 30 which communicates with the gap between the normal rotation roller 20 and the normal rotation touch roller 21 and the gap between the tightening roller 51 and the tightening touch roller 54. The feed shooter 30 includes a curved fixed guide plate 15 integrally formed in an L-shaped cross section, and the fixed guide plate 15.
And a movable guide plate 16 having a curved shape and facing each other with a band-pass allowable gap therebetween.

The fixed guide plate 15 is fixed to the substrate 5 with one end facing a part of the outer periphery of the normal rotation roller 20 and the other end facing a part of the outer periphery of the tightening touch roller 54.

Next, the operation of the above embodiment will be described with reference to the flowcharts of FIGS. Now, the band is placed around the article to be packed via a band guide arch on the packing machine body (not shown) or manually, and the tip of the band reaches each press member 6 forming the band welding mechanism (FIG. 9).

The solenoid 55 is not excited, the tension shooter 59 is located at the position indicated by the solid line in the lower part of FIG. 1, and the band entrance of the band passage 41b is connected to the feed shooter 3.
The band is formed so as to be located substantially on the same plane as the lower end edge of the band exit of the band passing passage 41c. Also, solenoid 2
7, the rod 28 of the solenoid 27 slides the operating rod 25 against the urging force of the spring 26, and the operating rod 25 moves to the eccentric shaft 24 as shown by a two-dot chain line in FIG. The front entrance of the band which faces the forward rotation touch roller 21 of the feed shooter 30 by separating the forward rotation touch roller 21 from the forward rotation roller 20 is formed widely.

This state is a preparation completion state, and corresponds to preparation lamp lighting and step SO.

Here, as shown in steps S1 and S2, when the start switch (125 in FIG. 3) is turned ON, the drive circuits 118 and 119 cause the camshaft electromagnetic clutch (FIG.
Reference numeral 117) is ON, the electromagnetic brake 9 is OFF, the cam shaft 4 rotates, and the band tip is held between the slide table 8 and the band tip holding mechanism of the band welding mechanism, that is, the right presser 81 (FIG. 9). .

Since the disk 70 is also rotating in the direction of the arrow in FIG. 1 with the rotation of the camshaft at the same time when the start switch 125 is turned on, the photosensor 77 receives light through the detection hole 72 and the control circuit section. The detection signal is input to the counter 112 of the counter 111, counted, and converted into a reverse signal in the control circuit unit 111.

This operation corresponds to step S3.

In response to this reverse rotation signal, the drive circuit 120 excites the solenoid 87, and the rod 88 of the solenoid 87 slides the arm 98 against the urging force of the spring 94, and the interlocking rod 91, split pin 96, and operating rod 90 , The eccentric shaft 86 is rotated, and the reverse rotation touch roller 13 is pressed against the reverse rotation roller 10.

The band passage 41a of the return shooter 1
A pair of rollers 10, which are rotationally driven,
The band 13 is pulled back at high speed (primary band tightening shown in step S3).

At this time, the solenoid 55 is not excited, and the band to be pulled back travels while smoothly sliding on the inner peripheral surface of the outer wall in the band passageway 41c of the tension shooter 59. In addition, the solenoid 27 is excited, and in FIG. 7, the forward rotation touch roller 21 is separated from the forward rotation roller 20.

When the band escapes from the arch and is wound around the object to be packed, the number of rotations of the reverse touch roller 13 decreases,
The solenoid 55 is excited by a signal to detect this, and the arm 57 is rotated counterclockwise on the paper of FIG.
8 is pressed against the tightening roller 51. Also, the tightening roller electromagnetic clutch (not shown) is actuated by the signal, and the tightening roller 51 rotates at a low speed and a high torque via the tightening speed reducer 52.

A pulley 67b provided coaxially with the pulley 12b rotates via a V-belt 68 wound around a pulley 67a attached to the rear end of the drive shaft 22 of the tightening speed reducer 52. Since the rotation rotates the pulley 67b via a tightening roller electromagnetic clutch provided coaxially,
The tightening roller 51 rotates via a V-belt 68 and a pulley 67a (FIG. 7).

The excitation of the solenoid 87 is released momentarily behind the excitation of the solenoid 55, and the reverse rotation touch roller 13 is separated from the reverse rotation roller 10.
The elastic member 53 having a large frictional resistance is wound around and tightened (secondary tightening). This operation is performed in step S
4, S5a and S5b.

During the secondary tightening process, the cam shaft 4 continues to rotate, that is, the disc 70 is also rotating, so that the photo sensor 77 receives light through the detection hole 73 and the counter of the control circuit unit 111 The detection signal is input to 112, counted 2, and converted into a left presser hold stop signal in the control circuit 111. This operation corresponds to step S4a. In response to the left presser stop signal, the drive circuits 118 and 119 turn off the electromagnetic clutch 117 and turn on the electromagnetic brake 9 to stop the rotation of the camshaft 4, and the left presser 83 has at least a band between its tip and the slide table 8. Stop at a position where a small gap that allows the band to pass beyond the thickness of one sheet is provided. This operation corresponds to step S4b.

The timer 114 in the control circuit 111 which operates when the solenoid 55 is turned on is timed up (set time T
In 1), the tightening roller electromagnetic clutch of the pulley 67b is disconnected via the drive circuit 121, and the tightening roller 51 is stopped. In the drive circuits 118 and 119, the camshaft electromagnetic clutch is operated again, and the electromagnetic brake 9 is turned off. Then, the camshaft 4 rotates again.

This operation corresponds to steps S5 and S6.

The set time T1 of the timer 114 is supplied from the detection circuit 127 to the control unit 113 (FIG. 3), and the control unit 113 sets the timer 115 (FIG. 3) according to the set time T1, ie, the set value of the band tightening force. The value of the time T2 in 3) is controlled.

Since the cam shaft 4 rotates again and the band supply end side is gripped, and the disc 70 rotates at the same time, the photo sensor 77 receives light through the detection hole 74 and the counter 112 of the control circuit unit 111 The detection signal is input, counted 3, and converted to a release signal. This operation corresponds to step S7.

With this release signal, the excitation of the solenoid 55 is released via the drive circuit 121, the arm rod 57 returns to the original position, and the tightening touch roller 54 and the tightening roller 51 are released.
Is released, the tension state of the portion is released, and the band supply end side is cut off. Camshaft 4 that continues to rotate
9 inserts a heater (not shown) on the heater crank 18 into the band overlapping portion in FIG. 9 and raises the intermediate presser 82,
The cutter lower blade provided on the intermediate presser 82 cuts the band supply end side straight and smoothly between the upper edge of the band passage hole 85 of the right presser 81 and the cutter upper blade. Pressurized and melted (primary pressing step), then the intermediate presser 82 is once lowered, and the heater is removed. At the same time, the photo sensor 77 receives light through the detection hole 75,
The FF signal is output, and the count 4 is input.

When the set time T1 by the timer 114 in the control circuit 111 is set to be longer than the standard set value of the band tightening force, that is, the standard set time T0, it is converted into an adhesion extension signal.

This operation is performed in steps S8 and S8a to 8d.
Is equivalent to

The adhesion extension signal is sent to the control section 113 in the control circuit section 111, and the timer 115 in the control circuit section 111 which operates in response to the adhesion extension signal times out (set time T).
Until 2), the rotation of the camshaft 4 stops after the intermediate presser 82 rises again, and only the melted band overlap portion is pressed and fixed for a certain period of time. , Electromagnetic brake 9 ON time (T
The value of 2) is controlled in the control unit 113 and varies in direct proportion to the set time T1. That is, as the tightening force of the band increases, the stop time of the camshaft becomes longer, and the pressure cooling time of the band bonding portion becomes longer.

On the other hand, when the set time T1 of the timer 114 is set shorter than the standard set value, that is, the standard set time T0, the value of the cam shaft stop time T2 by the timer 115 described later becomes 0, and the cam shaft does not stop. In other words, the secondary press process is pressurized and cooled for a standard cooling time of 0.11 second by the cam. This operation corresponds to step S10.

When the timer 115 has timed out, the camshaft 4 rotates again, the photosensor 77 receives light via the detection hole 76, and a detection signal is input to the counter 112 of the control circuit unit 111 to count 5, and It is converted to a normal rotation signal. This operation corresponds to steps S11 and S12. The electromagnetic brake 9 is turned on by the drive circuits 118 and 119 to which the forward rotation signal is input, the rotation of the camshaft 4 is stopped (step S13), and the camshaft electromagnetic clutch (117) of the camshaft 4 is disengaged and driven. In the circuit 124, the excitation of the solenoid 27 is released and the forward rotation touch roller 21 is pressed against the forward rotation roller 20 by the spring 26 via the band, and as shown in steps S13a and 13b, the band of the predetermined length is set by the timer. It is supplied to the band guide arch on the upper surface, and when the set time of the timer expires, the solenoid 27 is excited again and the forward rotation touch roller 21 is rotated by the forward rotation roller 2.
0, the electromagnetic brake 9 is turned off by the drive circuits 118 and 119, the camshaft electromagnetic clutch operates again, and the camshaft 4 rotates again.

The rotation of the camshaft 4 causes the two light sources of the photo sensor 77 to be received at the same time through the detection hole 71, and the counter 112 of the control circuit 111 resets the count and converts the signal into the original position signal. With this home position signal, the camshaft electromagnetic clutch is turned off and the electromagnetic brake 9 is turned on and stopped. This operation is performed in steps S14, S15, S1.
Equivalent to 6.

As described above, the preparation of the next packing is completed at the same time when one step of packing is completed. That is, the above operation is repeated when the start switch 125 is turned ON.

The plurality of detected parts provided on the outer periphery of the disk 70 are not limited to the detection holes 71 to 76, and may be formed in a slit shape. The detected portion may be formed by using a difference in reflectance.

Further, a plurality of magnets may be provided on the outer peripheral portion of the disk 70 as a portion to be detected, and these magnets may be detected by a magnetic sensor such as a Hall element.

Further, a metal foil may be used as the portion to be detected, and a proximity switch may be used as the sensor.

Further, a conductor pattern may be used as the portion to be detected, and the conductor pattern may be detected by a contact switch.

[0078]

Since the present invention is configured as described above, it has the following effects.

(1) The tip of the band supplied to the outside of the main body is gripped, and the band is tightened to a packaged object by an arbitrary tightening force by the tightening force adjusting means. In the packing step of bonding the band overlap section by a primary press step of inserting a heater between the overlap sections and melting under pressure, and a secondary press step of bonding the melted band overlap section by pressing, the tightening force is used. The secondary press process time is increased in proportion to the set value of the band tightening force by the tension volume serving as the adjusting means, so that the band adhesive portion peeling does not occur at the minimum necessary. When the set value of the band tightening force is set to be equal to or more than the standard tightening value, the secondary press process can be performed in accordance with the predetermined standard cooling according to the set value. Since the cooling time is longer than the interval, the time required for the secondary pressing process can be set to an appropriate minimum time that does not cause peeling of the band adhesive part according to the set value of the band tightening force, and the bonding method that can shorten the packing time Could be provided. (2) A disk having a plurality of detected parts provided on the outer periphery thereof is fixed on the camshaft, and a sensor for detecting the detected part is provided facing the outer circumference of the disk. The detection signal of the sensor is supplied to a control circuit unit to generate a drive control signal based on the signal, and the drive control signal is transmitted from the control circuit unit to a drive circuit of a motor connected to the camshaft electromagnetic clutch and the roller. The output unit is configured to form a detected part that detects one of the plurality of detected parts during the secondary pressing step, and a control unit that inputs a set value of a band tightening force by a tension volume is used in the control unit. In response to the set value, the time to increase in proportion to the set value, a signal for stopping the cam shaft in the secondary pressing process is configured to be output to the drive circuit of the cam shaft, so that the band bonding portion peeling is performed. Necessary minimum that does not occur When the tightening force of the band by the tension volume as the tightening force adjusting means is set to a standard setting value or more, a detected portion that detects the secondary press process is detected. According to the detection signal of the sensor, the rotation of the cam shaft is stopped to cool the secondary pressing step to a predetermined standard cooling time or more according to the set value. Thus, it was possible to provide a bonding apparatus capable of shortening the packing time to a proper minimum time during which the band bonding portion does not peel off properly according to the band tightening force during the secondary pressing process.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a block circuit diagram showing an embodiment of the present invention.

FIG. 4 is a flowchart showing a flow of an operation according to the embodiment of the present invention.

FIG. 5 is a flowchart showing a flow of an operation according to the embodiment of the present invention.

FIG. 6 is a front view of the apparatus according to the embodiment of the present invention.

FIG. 7 is a rear view of the apparatus according to the embodiment of the present invention.

FIG. 8 is a perspective view showing an original position of each member of the related art.

FIG. 9 is a perspective view of a main part of a conventional control device.

FIG. 10 is a front view of a band supply / tightening mechanism showing a conventional technique.

[Explanation of symbols]

 Reference Signs List 1 band shooter 2 output shaft 4 cam shaft 5 substrate 6 press member 7 band guide 8 slide table 9 electromagnetic brake for cam shaft 10 reverse rotation roller 11 drive shaft 13 reverse touch roller 18 heater crank 19 gear 20 forward rotation roller 21 shaft 22 drive shaft 23 Forward rotation touch roller 31 Reduction gear 31a, 31b, 31c Limit cam 34a, 34b Machine frame 35 Cam 36 Feed motor 39 Tightening motor 41a, b, c Band passageway 42 Left bandway flap 43 Feed roller 45 Bracket 51 Tightening roller 53 Elastic body 54 Tightening touch roller 55 Solenoid 56 Rod 56 57 Crank 58 Eccentric shaft 59 Guide shooter 46 Annular member 61 Long hole 62 Guide pin 63 Reinforcement plate 64 Stopper 65 Bracket 70 Disk 7 To 76 detection hole 77 photo sensor 78 bracket 80 limit cam shaft 81 right holder 82 middle holder 83 left holder 85 band passage hole 110 detection unit 111 control circuit unit 112 counter 113 control unit 114, 115 timer 116 drive control signal transmission diagram 117 cam Shaft electromagnetic clutches 118 to 122 Drive circuit 124 Drive circuit 125 Start switch L1, L2, L3 Limit switch L5 Slide table switch T0 Standard setting time T1, T2 Time

Claims (6)

(57) [Claims] 1. A tip of a band supplied to the outside of a main body is gripped, and the band is tightened to an object to be packed with an arbitrary tightening force by a tightening force adjusting means. In the packing step of bonding the band overlap part by a primary press step of inserting a heater between the parts to melt under pressure and a secondary press step of pressing only the melted band overlap part by cooling and bonding, the tightening is performed. A band bonding method for a packing machine, wherein the secondary press step time is increased in proportion to a set value of a band tightening force by a tension volume as a force adjusting means, in proportion to the set value. 2. The method according to claim 1, wherein when the tightening force of the band is set to be equal to or more than a standard tightening value, the secondary pressing step is cooled for a predetermined standard cooling time or more according to the set value. Bonding method in the packing machine. 3. A plurality of press members provided on a cam shaft,
Band supply and tightening mechanism necessary for packing, band tip and supply end gripping mechanism, band supply end cutting mechanism, primary press means for inserting a heater between band overlapping sections to pressurize and melt, and the melted band Provide a bonding mechanism of the band polymerization section consisting of a secondary press means for pressing and bonding the polymerization section,
In a packing machine provided with a tightening force adjusting means for adjusting a tightening force of a band for gripping a band tip supplied to the outside of the main body with the gripping mechanism and tightening the band with an object to be packed, A single disk having a plurality of detected parts provided on the outer periphery is fixed, a sensor for detecting the detected part is provided facing the outer circumference of the disk, and a detection signal of the sensor is supplied to the control circuit unit. And generating a drive control signal based on the signal, and outputting the drive control signal from the control circuit unit to a drive circuit that controls the rotation of the camshaft. Forming a portion to be detected for detecting the secondary pressing step, and a detection signal of a sensor for detecting the portion to be detected for detecting the secondary pressing step, the band tightening force by the tension volume as the tightening force adjusting means. The system in which the set value was entered The control unit outputs a signal for stopping the camshaft in the secondary pressing process to the camshaft drive circuit for a time that increases in proportion to the set value in response to the set value. A band bonding device in a packing machine. 4. When the tightening force of the band by the tension volume as the tightening force adjusting means is set to a standard setting value or more, the detection signal of a sensor that detects a detection target for detecting the secondary pressing step is used to detect the second pressing process. Next press process,
The rotation of the cam shaft is stopped so as to cool for a predetermined standard cooling time or more according to the set value.
A band bonding apparatus in the packing machine described in the above. 5. The band bonding apparatus according to claim 3, wherein the detected portion includes a plurality of detection holes formed in an outer periphery of one disk, and the sensor includes two microphoto sensors. 6. The band bonding apparatus in a packing machine according to claim 3, wherein the drive circuit for controlling the rotation of the camshaft is a drive circuit for an electromagnetic clutch for a camshaft and a drive circuit for an electromagnetic brake.