JPH0811823A - Packing machine - Google Patents

Abstract

PURPOSE:To prevent a band from being erroneously adhered to improve working efficiency by pressing and cooling an overlap part where bands are melted and press-fitted by a press for a time duration corresponding to secondary tightening time of the band. CONSTITUTION:A band B is pulled around an object W to be packed which has been mounted on a working table 4, after primary tightening wherein the excessive band is pulled back between a pair of rollers 51, 53 at a high speed and low torque, secondary tightening is done strongly at a low speed and high torque during a time duration set by a secondary tightening time setting means. Thereafter an overlap part of a tip and a rear end of the band B is heated to be melted and then pressed and cooled corresponding to time set by the secondary tightening time setting means. Thus secondary tightening time can be adjusted according to a nature of the object to be packed, and pressing and cooling time of the overlap part can be also variable-controlled properly according to reactive force for tightening the object.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing machine adapted to wind a tape-shaped band made of a thermoplastic resin such as polypropylene around an article to be packed and to weld and bind the polymerized portion.

[0002]

2. Description of the Related Art Conventionally, in order to draw a band around an article placed on a work table, the band is sandwiched between a feed roller which is rotationally driven and a feed pressing roller which is pressed against the band. Then, in order to wind the band around the outer peripheral surface of the object to be packed, the excess feed is sandwiched between the back feed roller and the pressing roller pressed against the back feed roller and pulled back with high speed and low torque to perform primary tightening. After that, secondary tightening is performed by strongly tightening at low speed and high torque, and then the overlapping portion of the front end and the rear end of the band is heated by the heater operating mechanism provided in the band end processing unit (seal unit), The melted part is pressed by a press, cooled at the same time to be joined, and the rear end of the band is cut. Packaging machines are well known.

[0003] In such a packing machine, usually, at the time of melt-bonding the superposed portion of the band, first the primary press is carried out by lightly pressing the press with the heater plate inserted in the superposed portion, and then it is once lowered. After the heater plate is withdrawn from the overlapping part of the band, the press is raised again to strongly press the overlapping part, and the secondary press is carried out for holding for a predetermined time and cooling.

[0004]

In the conventional packing machine as described above, when the band stacking portion is pressed and cooled in the secondary pressing step, the cam shaft for driving the press cam is stopped for a predetermined time. If the stopping time is short, for example, when the welding and joining work of the band wrapped around the elastic object to be packed such as a futon, a waste cloth, etc. is performed, the overlapped portion is not completely bonded. In addition, due to the elastic reaction force of the object to be packaged against the tension applied to the object to be packaged during the secondary tightening, the overlapping portion may cause adhesion failure such as peeling or separation. By the way, the press cooling time at the time of normal secondary pressing is 0.05 to 0.1 seconds, while it is about 0.3 to 0.5 seconds for items to be packed with a large elastic coefficient such as futon and waste cloth. is required. for that reason,
There is also one that is configured to perform the packing work while individually adjusting the press cooling time in the secondary press according to the property of the object to be packed, but it is difficult to set an accurate stop time, and
The adjustment work is troublesome, and there is a problem that work efficiency is reduced.

The present invention has been made in view of such problems, and an object thereof is to carry out the packing work in which the kinds of the objects to be packed are continuously different. The present invention is to provide a packing machine capable of quickly and accurately automatically adjusting the optimum press cooling time according to the property of (1), preventing band adhesion failure, and improving work efficiency.

[0006]

In order to achieve the above-mentioned object, the packing machine according to the present invention basically sends a band around the object W to be packed placed on a work table. After that, after performing the primary tightening for pulling back the band at a high speed and low torque by sandwiching the delivery surplus between the pair of rollers to wind the band around the outer peripheral surface of the object to be packed, the time set by the secondary tightening time setting means. In a packing machine configured to perform secondary tightening by tightening only at low speed and high torque, and then heat and melt the overlapping portion of the leading end and the rear end of the band by the heater operating mechanism and press and cool by the press. A secondary press for controlling the pressing and cooling time of the overlapping portion by the press in accordance with the secondary tightening time set by the secondary tightening time setting means. It is characterized by comprising a scan time control means.

More specifically, the secondary tightening time setting means includes a digital code switch for outputting a set value set externally as a digital signal, a dip switch for changing a setting range, and the dip switch. And a programmable controller having an internal timer for inputting a set value signal from the digital code switch and setting a secondary tightening time according to a built-in program based on the set value signal. The secondary press time control means includes a programmable controller of the secondary tightening setting means, and further, the pressing and cooling time at the time of the secondary press of the overlapping portion, It is preferable that the subsequent tightening time is set to be approximately the same.

[0008]

[Operation] In the packing machine according to the present invention configured as described above, secondary tightening of the band is performed for a set time, and thereafter, the heater operation mechanism performs the melt compression bonding of the overlapping portion of the band, Subsequently, the polymerized portion is pressed and cooled by a press for a time corresponding to the secondary tightening time. In this way, the secondary tightening time can be adjusted according to the property of the object to be packed, and during the press cooling period of the overlapped part, accurate variable control according to the tightening reaction force of the object to be packed becomes possible, and the band overlap It is possible to prevent defective adhesion of the adhesive portion.

[0009]

1 and 2 are a schematic configuration plan view and a front view showing a layout of a main part of an embodiment of a packing machine according to the present invention, and the packing machine 1 shown in the drawings is basically Similarly to the conventional one, a gate-shaped arch portion 5 for band guide is provided on a box-shaped main body housing 3 having a work table 4 on which the article W to be packed is placed, and the main body housing 3 has A reel housing R for housing a reel unit (not shown) loaded with a band coil is provided, and
A band processing mechanism for feeding, tightening, welding, cutting and the like of the band delivered from the reel unit is arranged between the reel housing R and the work table 4.

This band processing mechanism comprises a high speed feed motor 10 horizontally arranged in the right corner between the work table 4 and the partition member 9 (FIG. 2), and the lower left side of the partition member 9. The cam motor 30 is arranged horizontally in the section, and the band end processing unit 80 is arranged directly below the substantially central portion of the work table 4. The rotational driving force of the high-speed feed motor 10 is transmitted from the pulley 11 fixed to the output shaft 10a to the back feed pulley 21 and the feed pulley 22 by the endless annular V belt 12, and the driving force is further transmitted to the back feed pulley 21 and the feed pulley 22. Pulley 21
Is transmitted to the back-feed rotary shaft 16 and the back-feed roller 51 fixed to one end thereof via the friction clutch 25, and is fixed to the feed rotary shaft 17 to which the feed pulley 22 is fixed and one end thereof. It is also adapted to be transmitted to the formed feed roller 52.

More specifically, referring to FIGS. 3 and 4, the backfeed rotary shaft 16 and the feed rotary shaft 17 include the high-speed feed motor 10 and the band end processing unit 80. And a frame-shaped roller support housing 15 arranged between the upper and lower sides of the roller support housing 15 rotatably above and below and parallel to the output shaft 10a of the motor 10. The back feed pulley 21 is rotatably fitted to the side (input portion) via a bearing 24, and the friction element 27 of the friction clutch 25 is fixed on the rotary shaft 16 on the outer surface side of the back feed pulley 25. A pressing plate 26, which is pressed against the pulley 25 by the urging force, is integrally fitted and fixed by a key or the like.

A one-way clutch 45 to which a rotational driving force from a cam motor 30 to be described later is transmitted is connected to the outer side of the back feed rotary shaft 16 beyond the friction clutch 25. This one-way clutch 45 is of a well-known type in itself, and has a specially shaped cam (slug) between the inner ring and the outer ring, and its wedge action transmits the rotation only in one direction. Is being done.

Further, in the roller support housing 15, a back feed pressing roller 53 and a feed pressing roller 54 are respectively provided with a back feed roller pressure contact mechanism 61 and a feed roller pressure contact mechanism 62 which will be described later.
Is arranged so as to be selectively brought into pressure contact with and separated from the back feed roller 51 and the feed roller 52 (detailed later).

On the other hand, the rotational driving force of the cam motor 30 is divided into two systems and transmitted by a small-diameter pulley 31 and a large-diameter pulley 32 fixed to its output shaft 30a (FIG. 2). That is, the first system is the small-diameter pulley 3
1 is fixed to one end of a relay rotary shaft 35 arranged in parallel with the backfeed rotary shaft 16, the feed rotary shaft 17 and the like by an endless annular V-belt 33 that is looped upwardly to the first position. Relay pulley 36
To the input pulley 41 arranged on the input side of the speed reducer 40, which will be described later, via the second relay pulley 38 fixed to the other end of the relay rotary shaft 35. It Then, the input pulley 41
Is transmitted to an output pulley 43 fixed to the output side of the speed reducer 40 via a friction clutch 42 designed to act as a torque keeper, and from there, the timing belt 4
It is transmitted to the input side (outer wheel side) of the above-mentioned one-way clutch 45 via 4.

The second system for transmitting the rotational driving force of the cam motor 30 is the band end processing unit 80 described above by the endless annular V-belt 34 wound diagonally upward on the large-diameter pulley 32. Is transmitted to a pulley 46 provided on the input side of an electromagnetic clutch 47 disposed in the vicinity of the electromagnetic clutch 47 and the electromagnetic clutch 47 and the electromagnetic brake 4.
8 to the camshaft 90 (FIG. 2) of the band end processing unit 80, whereby a front grip 81, a rear grip 82 provided on the unit 80,
Press 84, slide table 85, slide guide 8
In addition to 6, the movable member of the heater 60, which is well known in this type of packing machine, is operated at a predetermined timing. The electromagnetic clutch 47 and the electromagnetic brake 48 are selectively driven. When the electromagnetic clutch 47 is ON and the electromagnetic brake 48 is OFF, the band end processing unit 80 performs a predetermined operation and the electromagnetic clutch 47 is OFF. Electromagnetic brake 48 is O
When it is N, the above operation is held at the stop position.

In addition to the overall structure as described above, in the present embodiment, the back feed pressing member 61 and the feed roller pressing member mechanism 62 attached to the roller support housing 15 are used to hold the back feed pressing member. The roller 53 and the feed pressing roller 54 are selectively brought into pressure contact with and separated from the oblique lower portions of the back feed roller 51 and the feed roller 52, respectively.

That is, the back feed pressing roller 53 and the feed pressing roller 54 are respectively provided with individual supporting members 55 as shown in FIGS. 3 and 4.
The support members 55A and 56A are rotatably supported by support shafts 55 and 56 fixed to A and 56A, and the support members 55A and 56A are eccentric with respect to the pressing rollers 53 and 54. 54 axis of rotation P,
It is fixed to one end of eccentric shafts 57 and 58, both ends of which are rotatably supported by the roller support housing 15, which have rotation axes X and Y at positions eccentric to Q. Then, the base ends of the swing levers 67, 68 are fixed to the eccentric shafts 57, 58, and the solenoids are provided in the long holes 67a, 68a formed at the swing ends of the swing levers 67, 68. Type actuators 63, 64 actuating rods 63a, 64a
The pins 65 and 66 inserted through the
Vertical movements of the operating rods 63a and 64a in the vertical direction are converted into rotational movements of the eccentric shafts 57 and 58 via the swing levers 67 and 68, whereby the back feed pressing roller 54 and the feed pressing roller are rotated. 55 are selectively brought into pressure contact with and separated from the back feed roller 51 and the feed roller 52, respectively.

More specifically, the solenoid type actuators 63 and 64 are configured so that when the built-in solenoids thereof are not energized (OFF),
The actuating rods 63a and 64a are largely projected by the urging force of the springs incorporated therein, as indicated by the alternate long and short dash line in FIG. Therefore, at this time, the swing levers 67 and 68 also take the positions as shown by the one-dot chain line in FIG. 4, and accordingly, the pressing rollers 53 and 54 are made by the back-feed roller as shown by the one-dot chain line in FIG. 51, a position separated from the feed roller 52.

On the other hand, when the built-in solenoid is energized and energized (ON), as shown by the solid line (or broken line) in FIG. 4, the actuating rod 63a is resisted against the urging force of the built-in spring. , 64a are pulled inward. Therefore, at this time, the swing levers 67 and 68 are positioned as shown by the solid line (or broken line) in FIG. 4, and accordingly, the eccentric shaft 5 is moved.
7, 58 rotate from the OFF position by a predetermined angle, the supporting members 55A, 56A swing, and the pressing rollers 53, 54 are back-feed roller 51, feed roller 52 as shown by the solid lines in FIG. Is pressed against.

The outer peripheral surfaces of the back feed roller 51 and the feed roller 52 are made of urethane rubber which is unlikely to cause the band B to slip. Therefore, the back feed roller 51 and the back feed pressing roller 53 are
Band B between the feed roller 52 and the feed pressing roller 54, and the back feed roller pressure contact mechanism 61 and the feed roller pressure contact mechanism 62 are selectively operated as described later. By operating the band B, it is possible to accurately feed and pull back the band B at any timing without causing slippage.

In the packing machine 1 of the present embodiment configured as described above, when packing the article W to be packed in the band B, the power source of the control device (not shown) is turned on and the automatic insert (of the band B). Feed roller 5 at the tip
2 is automatically sent out from the reel unit to a position where it passes over 2, the high-speed feed motor 10 is started to rotate the output rotary shaft 10a in the forward direction, and the feed roller pressure contact mechanism is also provided. 62 solenoid type actuator 64 is activated (ON)
Be punished.

Thereby, the high-speed feed motor 1
The rotational driving force of 0 is transmitted from the V-belt 12 to the back feed roller 51 via the pulley 21 and the friction clutch 25, and the feed roller 5 via the pulley 22.
2, the feed roller 52 rotates in the forward direction (feed direction). At this time, the operating rod 64a of the solenoid actuator 64 is pulled inward, and the swing arm 68 swings from the position shown by the alternate long and short dash line in FIG. 4 to the position shown by the broken line, and the eccentric shaft accordingly. 58 and the support member 56A rotate by a predetermined angle (counterclockwise direction in FIG. 4), and the feed pressing roller 54 is pressed against the feed roller 52 with the band B interposed therebetween. At this time, the solenoid type actuator 63 of the roller pressure contact mechanism 61 for the back feed roller is OFF, and the back feed pressing roller 53 is the back feed roller 5
It is in a state of being separated from 1.

As a result of the above operation, the tip of the band B (the cutting portion at the time of the previous packing) passes around the lower surface side of the work table 4 and then circulates around the object W to be packed while being guided by the gate-shaped arch portion 5. And is fed between the slide guide 86 and the slide table 85 of the band end processing unit 80, and is located at the tip end in the feed direction of the slide guide 86 for detecting the completion of feed ( It is sent to the position detected by (not shown).

At this time, the rear end side of the band B passes through a gap formed between the back feed roller 51 and the back feed pressing roller 53 which is not in pressure contact with each other, and the guide surface 59a of the guide member 59 and the like. Is guided by the slide guide 86 and the press 84 of the band edge processing unit 80.
And it is sent out so as to pass through between the rear grip 82 and the rear grip 82.

Then, by the proximity switch, the band B
When the tip of the sheet is detected, the high-speed feed motor 10
Is temporarily stopped, and the solenoid actuator 64 of the feed roller pressure contact mechanism 62 is turned off.
The FF state is set. As a result, the band feeding is stopped and the feed pressing roller 54 is returned to the original position (the position indicated by the alternate long and short dash line in FIG. 4). Then, thereafter, the cam motor 30 is activated at a predetermined timing, the electromagnetic clutch 47 is turned on, and the electromagnetic brake 48 is turned off.
In the F state, the rotational driving force of the cam motor 30 is transmitted to the cam shaft 90 via the V belt 34 and the electromagnetic clutch 47, whereby the front grip 81 of the band end processing unit 80 is raised. Being
The tip of the band B is held.

When it is detected that the tip portion of the band B is held by, for example, an ON operation of a limit switch (not shown) for confirming a work operation origin provided in association with the camshaft 90, High speed feed motor 1
0 is restarted so that its output rotary shaft 10a is rotated in the direction opposite to the direction in which the band is fed, and the solenoid actuator 63 of the back feed roller pressing mechanism 61 is activated (ON).

As a result, similarly to the above, the rotational driving force of the high-speed feed motor 10 is transmitted from the V belt 12 to the back feed roller 51 via the pulley 21 and the friction clutch 25, and also via the pulley 22. It is transmitted to the feed rollers 52 and these rollers 51, 52
Rotates in the reverse direction (pullback direction), and the operating rod 63a of the solenoid type actuator 63 is further drawn inward to move the swing arm 67 from the position shown by the alternate long and short dash line in FIG. 4 to the position shown by the solid line. It swings, and accordingly, the eccentric shaft 57 and the support member 5
5A rotates by a predetermined angle (clockwise direction in FIG. 4), and the back feed pressing roller 53 is pressed against the back feed roller 51 with the band B interposed therebetween.

At this time, the back feed roller 51
Is rotated at a speed higher than the rotational speed at which the one-way clutch 45 is in the meshed state, the one-way clutch 45 (between the inner and outer wheels thereof) is in a slipping state, and the one-way clutch 45 is moved from the cam motor 30 via the timing belt 44. Is not transmitted to the rotary shaft 16 of the back feed roller 51.

By the above-mentioned operation, the excess feed amount of the band B is pulled back with high speed and low torque while being sandwiched between the back feed roller 51 and the back feed pressing roller 53 pressed against the back feed roller 51, and the primary tightening is performed. Is done. Then, when the band B comes into contact with the outer peripheral surface of the article W to be drawn and the excess feed amount is pulled back, and the tension acting on the band B suddenly increases, the load acting on the high-speed feed motor 10 increases, and The frictional force between the back-feed roller 51 and the band B rapidly increases, whereby the friction clutch 25 starts to slide and the rotation shaft 16 of the back-feed roller 51 driven by the high-speed feed motor 10 rotates. The speed drops rapidly.

When the rotational speed of the rotary shaft 16 decreases to the rotational speed of the one-way clutch 45 rotated by the cam motor 30 on the outer ring side, the slug of the one-way clutch 45 meshes, and this time. The rotary shaft 1 of the back feed roller 51 from the cam motor 30 via the speed reducer 40.
The rotational driving force of low speed and high torque is transmitted to 6, so that the band B is strongly pulled while being sandwiched between the back feed roller 51 and the back feed pressing roller 53 to perform the secondary tightening. . Then, when the band B is tightened to some extent, the friction clutch 42 provided on the input side of the speed reducer 40 starts to slide out, so that the article W to be packed is not excessively tightened in the band B. .

Here, in the packing machine 1 of this embodiment,
The secondary tightening time is set by the secondary tightening time setting means 100 (described later) that allows a signal externally set by a digital code switch to be input to a programmable controller (hereinafter referred to as PC). Hereinafter, the details of the secondary tightening time setting means 100 will be described with reference to FIGS. 5 and 6.

FIG. 5 shows the secondary tightening time setting means 100.
FIG. 6 is a system diagram showing an overall outline of FIG. 6, and FIG. 6 is a diagram showing an example of the operation switch 110. The operation switch 110
A setting value externally set by a digital code switch 111 such as a rotary switch provided in the PC is used as a 3-bit BCD (binary coded decimal) signal on a PC.
It is input to 101. On the other hand, the setting range set by the DIP switch 112 is also input to the PC 101. The PC 101 has a numerical value (for example, 0 to 7) input from the rotary switch 111 and a selection range (for example, 2) input from the dip switch 112 according to a program stored therein.
Based on 0, 50, 100 ms, ...), the setting value of the internal timer 101a of the PC 101 is calculated by an arithmetic expression such as multiplication. The internal timer 10 thus obtained
The ON operation time of the solenoid type actuator 63 of the back feed roller pressure contact mechanism 61 is set by the set value of 1a, and thus the secondary tightening time is set. The secondary tightening time setting means 10 is configured by the digital code switch 111, the DIP switch 112, the PC 101 (the internal timer 101a) and the like.
0 is configured.

The operation switch 110 is, as shown in FIG. 6, a power lamp 112, a stop switch 113 which is stopped when the machine is pressed and is released when the machine is turned to the right, a start switch 114, and a band is pushed to the delivery tip position when the switch is pressed. A manual band feed switch 115 that can send the band, a manual return switch 116 that can return the band only while it is pressed, and a band break alarm switch 117 that blinks when the band runs out are arranged.

After the secondary tightening of the object W to be packed, which is finely set by the operation switch 110, is performed for an optimum time, the rear end of the band B is held by the rear grip 82 in the band end processing unit 80. The heating and melting of the superposed portion of the front end and the rear end of the band B by the heater 60, which will be described later, the pressing and cooling of the melted superposed portion by the press 84, the cutting of the rear end of the band B, etc. are performed in known modes and procedures. Then, the article to be packed W is packed by the band B with an appropriate tension suitable for the property.

Next, the structure of the heater operating mechanism 50 will be described with reference to FIGS. 7 and 8. The heater operating mechanism 50, as shown in FIG. 7 and FIG.
Support shaft 71 disposed below the above-mentioned cam shaft 90
With the pivot 73 as a pivot, the roller 73 swings while following the lift surface of the cam 92 while the roller 73 is in contact with the lift surface of the cam 92 of the cam shaft 90 that is rotationally driven, while resisting the biasing force of the coil spring 78. A swing arm 70 configured to
The heater 6 detachably attached to the swing arm 70
0, and the heater 60 has a heater plate 72 that is inserted between the overlapping portion of the front end portion and the rear end portion of the band B to generate heat, and the entire heater plate 72 of the swing arm 70. Locking bolt 9 attached to the top
It is retained by the coil springs 5 and 96 and urged downward by the coil spring 79.

Therefore, the heater 60 together with the swing arm 70 is swung so as to follow the contour of the cam 92. In this case, the forward / backward movement of the heater 60 is interlocked with the slide guide 85 which is horizontally moved by the cam 92 via the roller 94 and the swing arm 87 (FIG. 7). That is, when the slide guide 85 is moved in the exiting direction (to the right in FIG. 7), the heater plate 72 replaces the slide guide 85 and is spaced apart from each other in a vertically tensioned state. The band B is inserted into a gap between the front end and the rear end of the band B, and immediately after that, the pressing force of the press 84 is raised to melt and press the facing surface of the band B. Be seen. The press 84 is first lightly pressed by the overlapping portion of the band B, and then is temporarily lowered. At the same time, the heater plate 72 is withdrawn from the overlapping portion of the band B, and then the press 84 is again raised. During this re-elevation, the overlapping portion is strongly pressed by the press 84 (hereinafter referred to as a secondary press) and cooled, and the band B is cut by a cutter (not shown) provided at the upper end of the press 84. The rear end is cut off.

Here, after starting the secondary press, the PC 10
For example, the press 84 is held in pressure contact with the overlapping portion for the same time as the secondary tightening time set by the internal timer 101a. That is, the PC1
01 indicates the electromagnetic brake 48 at the same time when the secondary press is started.
Is turned on to actuate the electromagnetic clutch 47 to be turned off to stop the rotation of the camshaft 90 and move the press 84 up and down for the same time as the secondary tightening time set by the internal timer 101a. The program is stored in the ROM so as to stop the operation of (not shown). The PC 101 constitutes a secondary press time control means for performing control so that the secondary tightening time set by the secondary tightening setting means 100 is almost the same.

As described above, even if the object to be packed has a large elasticity (long secondary tightening time) such as a futon or a waste cloth,
Normally, the secondary pressing is performed only for 0.05 to 0.1 seconds, but according to the packing machine of the present embodiment, the press cam is longer than usual, for example, about 0.3 to 0.5 seconds. Can be stopped at the secondary pressing position, and the cooling period of the overlapped portion can be extended in accordance with the tightening reaction force (elasticity) against the secondary tightening force of the article W to be packed. It is possible to prevent defective adhesion of the polymerized adhesive portion of the band B.

[0039]

As can be understood from the above description, according to the packing machine of the present invention, even if the packing work in which the kinds of the objects to be packed are continuously performed is different, the property of the objects to be packed is improved. The optimum press cooling time can be automatically adjusted quickly and accurately, and the band adhesion failure can be prevented to improve the work efficiency.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a layout of main parts of an embodiment of a packing machine according to the present invention.

FIG. 2 is a schematic front view showing a layout of main parts of the packing machine of the embodiment.

FIG. 3 is an enlarged plan view showing the periphery of the feed roller of the packing machine of the embodiment.

FIG. 4 is an enlarged front view showing the periphery of the feed roller of the packing machine of the embodiment.

FIG. 5 is a system diagram showing an overall outline of secondary tightening time setting means of the packing machine of the embodiment.

FIG. 6 is a front view of operation switches of the packing machine according to the embodiment.

FIG. 7 is an enlarged front view showing the periphery of the heater operating mechanism of the packing machine of the embodiment.

FIG. 8 is an enlarged side view showing the vicinity of the heater operating mechanism of the packing machine of the embodiment.

[Explanation of symbols]

4 ... Work table 50 ... Heater operating mechanism 51 ... Back feed roller 53 ... Back feed pressing roller 84 ... Press 100 ... Secondary tightening time setting means 101 ... Programmable controller (secondary press time control means) 101a ... Internal timer 111 ... Digital code switch 112 ... DIP switch W ... Packaged object B ... Band

Claims (4)

[Claims] 1. A band B is sent out to be routed around an article to be packed W placed on a work table 4, and then a pair of excess feeds is wound to wind the band B around the outer peripheral surface of the article to be packed W. After performing the primary tightening which is sandwiched between the rollers 51 and 53 and fastened back with high speed and low torque, the secondary tightening is performed by strongly tightening with low speed and high torque for the time set by the secondary tightening time setting means 100, and then the heater is operated. In a packing machine configured such that the mechanism 50 heats and melts the overlapped portion of the front end portion and the rear end portion of the band B and presses and cools the press 84, And a secondary press time control means 101 for controlling the secondary tightening time setting means 100 in accordance with the secondary tightening time. Packing machine, characterized in that. 2. The secondary tightening time setting means 100.
Is a digital code switch 111 for outputting a set value set externally as a digital signal, a DIP switch 112 for varying a setting range, and a set value signal from the DIP switch 112 and the digital code switch 111. 2. The packing machine according to claim 1, further comprising: a programmable controller 101 having an internal timer 101a for setting a secondary tightening time according to a built-in program based on the set value signal. 3. The secondary press time control means 101 comprises:
The packing machine according to claim 1, further comprising a programmable controller 101 of the secondary tightening time setting means 100. 4. The packing machine according to claim 1, wherein a pressing time and a cooling time during the secondary pressing of the overlapping portion are set to be substantially the same as a secondary tightening time.