JP3244595B2 - 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 packing machine for winding a tape-shaped band made of a thermoplastic resin such as polypropylene around an object to be packed, and welding and bundling a polymerized portion thereof.

[0002]

2. Description of the Related Art Conventionally, a band is sandwiched between a feed roller for rotating and driving the band and a feed holding roller for pressing the band in order to draw the band around an object to be packed placed on a work table. Then, the band was wound around the outer peripheral surface of the article to be packed, and the excess amount of the band was sandwiched between a back feed roller and a press roller pressed against the back feed roller to perform primary tightening by pulling back at high speed and low torque. After that, secondary tightening is performed to tighten strongly with low speed and high torque, and then the overlapping part between the front and rear ends of the band is heated by the heater operating mechanism provided in the band end processing unit (seal unit), and the fused part is heated. The package is adapted to be press-bonded at the same time as cooling and joining at the same time, and to cut the rear end of the band. The machine is well known.

[0003] A band arch of a gate-shaped frame is provided as a whole on a workbench on which the article to be packaged is placed, and a band drawn out from a band reel loaded with a band coil is placed around the article to be packaged. A packing machine that is arranged automatically is also well known (for example, see Japanese Patent Laid-Open No. 2-21).
9713, JP-A-62-146117). In such a conventional packing machine, a band guide made of synthetic resin for guiding and holding the band is provided along the inner peripheral surface of the band arch. It is common to draw a band from a guide.

[0004]

The resin-made band guide in the conventional packing machine as described above is provided with a shaft fixed horizontally across the center of the horizontal portion of the band arch in the width direction via a coil spring or the like. It is slidably supported, and is supported by a coil spring or the like having a large elastic coefficient in vertical portions provided on both right and left sides.

As described above, since the band guide is supported by the band arch with a relatively strong elastic supporting force,
In order to pull out the band from the band guide at the start of the primary tightening, a relatively high torque tightening force corresponding to the strong spring force is required. And when such primary tightening with relatively high torque is performed,
There is a problem that the band is easily twisted or displaced, and the smooth primary tightening work is hindered, resulting in a decrease in work efficiency. Further, there is a problem that the support mechanism of the band guide has a complicated configuration, and the number of parts and the manufacturing cost are expensive.

The present invention has been made in view of such a problem, and an object of the present invention is to make it possible to reliably and smoothly pull out a band from a band guide with a relatively small tightening force at the time of primary tightening. It is an object of the present invention to provide a packing machine which can be configured inexpensively and simply.

[0007]

In order to achieve the above object, a packing machine according to the present invention is provided on a work table, and has an arch portion for winding and arranging a band around an outer periphery of an object to be packed. A band guide in which the band is removably arranged in an arch portion, and a band guide support mechanism for elastically supporting the band guide to constantly bias the band guide toward one inner side wall surface of the arch portion. In the packing machine,
The band guide supporting mechanism includes a center supporting means for slidably supporting the band guide in a width direction of the band guide, and an excessively movable movement of the band guide, and swingably supported by the arch portion. Side support means ,
The center support means is provided on the other inner side of the arch portion.
A guide rod attached to a wall in a cantilever manner;
And slides along the guide rod
A possible support guide and an external fit on the guide rod
The support guide is always attached to the one inner side wall surface direction.
And a biasing coil spring .

As a more specific example , the side support means includes a guard formed in an appropriate shape so as to restrict excessive horizontal movement of the band guide, and a swingable swinging means on the arch portion. A lifting rod which is suspended and supported, and one end of which is locked to the lower end of the lifting rod, and the other end of which is provided with lifting means comprising a lifting spring which is locked to the band guide. Can be

[0009]

In the packing machine according to the present invention configured as described above, the band guide is constantly urged toward the one inner side wall surface of the arch by the urging force of the coil spring and the lifting spring. A closed space passage through which the band is guided and held is formed between the one inner side wall surface and the band guide. At the time of primary tightening, the band guide is horizontally moved in a direction away from the side wall surface of the arch portion against the biasing force of the coil spring and the lifting spring due to the tightening tension of the band, and the band guide and one of the inner sides are moved. A gap is created between the band and the wall surface, and the band is pulled out of the band guide. At this time, the band guide comes into contact with the guard and is prevented from moving more than necessary.

[0010]

1 and 2 are a schematic plan view and a front view, respectively, showing a layout of a main part of an embodiment of a packing machine according to the present invention. The packing machine 1 shown in the drawings is basically As in the conventional case, a band guide mechanism including a gate-shaped arch portion 5 for band guidance is provided on a box-shaped main body housing 3 having a work table 4 on which an article to be packed W is placed, A reel storage unit R for storing a reel unit (not shown) loaded with a band coil is provided in the main body housing 3, and is fed out of the reel unit between the reel storage unit R and the work table 4. A band processing mechanism for sending out, tightening, welding, and cutting the band B is provided.

First, a band guide mechanism, particularly a band guide support mechanism including a center support means and a side support means will be described. FIG. 5 is a schematic front view of the packing machine according to one embodiment of the present invention, in which a band guide frame member on the near side is cut away to show the entire inside of the band guiding mechanism. FIG.
FIG. 7 is an enlarged cross-sectional view taken along line VII-VII of FIG. 6. 8 is an enlarged view of a main part of a portion VIII in FIG. 5, and FIG. 9 is a sectional view taken along the line IX-IX in FIG.

As shown in FIG. 5, the arch portion 5 in the illustrated example has left and right vertical portions 5a and 5a having a U-shaped cross section opened facing the inside of the gate shape. And a horizontal portion 5b connecting the upper ends of the vertical portions 5a, 5a. As shown in FIG. 9, the inner space of the arch portion 5 is formed of a frame member having a U-shaped cross section in which an open hollow guide groove 70a for guiding and holding the band B is formed. A band guide 70 made of a synthetic resin having elastic resilience is provided.

As can be seen from FIGS. 8 and 9, the band guide 70 is constantly urged in the direction of one inner side wall surface 5c of the arch portion 5 by the center support means 71 at the center of the horizontal portion 5b. And is horizontally movably supported in the width (front-back) direction of the horizontal portion 5b. That is, the center support means 71 includes a hexagon socket head bolt 72 as a guide rod which is cantilevered and fixed to the other inner side wall surface 5d of the horizontal portion 5b by welding or the like.
9, a support guide 73 slidably supported on the upper surface of the hexagon socket head bolt 72, and the support guide 73 fitted externally to the hexagon socket head bolt 72 to the right in FIG. A relatively weak coil spring 76 that gently urges in the direction of the wall surface 5c. The support guide 73 is connected to the band guide 7 via a holding plate 92.
Horizontal part 7 that is tightly fixed by inserting bolts 69, 69 through
4, a vertical portion 75 having a notch groove 75a formed at the lower end of the center portion, into which the hexagon socket head bolt 72 is inserted;
And a plate-like member having a substantially L-shaped side section.

On the other hand, in the vertical portion 5a, as shown in FIGS. 6 and 7, the band guide 70 has a crank portion 77a bent at the upper end in a crank shape and a right angle bent at the lower end portion. A lifting member which is formed of a rod-shaped member having a bent portion 77b and whose upper end and lower end are fixed to the arch portion 5 and which is swingably supported by a bracket 96 of the arch portion 5. Rod 7
8 and one end 79 of the lower end of the lifting rod 78.
a is locked, and the other end 79b is locked to a bracket 97 fixed to the band guide 70. A lifting means 89 comprising a relatively weak lifting spring 79 only for lifting the band guide 70 is provided. Supported by the side supporting means 95. In order to adjust the tension of the lifting spring 79, a plurality of locking holes 9 are formed in the bracket 96 of the lifting rod 78.
6a is provided.

Next, the band processing mechanism will be described.
The band processing mechanism includes a high-speed feed motor 10 horizontally disposed at the right corner between the work table 4 and the partition member 9 (FIG. 2), and a horizontal high-speed feed motor at the lower left side of the partition member 9. And a band end processing unit 80 disposed just below a substantially central portion of the work table 4.

The rotational driving force of the high-speed feed motor 10 is transmitted from a pulley 11 fixed to its output shaft 10a to a back feed pulley 21 by an endless annular V-belt 12.
And the driving force is transmitted to the feed pulley 22, and the driving force is further transmitted from the back feed pulley 21 to the friction clutch 25.
Is transmitted to the back-feed rotary shaft 16 and the back-feed roller 51 fixed to one end thereof, and the feed rotary shaft 17 to which the feed pulley 22 is fixed and the feed roller fixed to one end thereof. 52 is also transmitted.

3 and 4, the back feed rotary shaft 16 and the feed rotary shaft 17 are composed of the high speed feed motor 10 and the band end processing unit 80. And one end of the back-feed rotary shaft 16 of the frame-shaped roller support housing 15 rotatably and vertically rotatable and parallel to the output shaft 10a of the motor 10. The back feed pulley 21 is rotatably externally inserted through a bearing 24 on the side (input portion), and the friction element 27 of the friction clutch 25 is fixed on the rotating shaft 16 on the outer surface side of the back feed pulley 25. The pressing plate 26 pressed against the pulley 25 by the urging force is integrally fitted and fixed to the outside with a key or the like.

A one-way clutch 45 to which a rotational driving force from a cam motor 30 described later is transmitted is connected to the back feed rotary shaft 16 further outward than the friction clutch 25. This one-way clutch 45 is of a well-known type in itself, has a specially shaped cam (sprag) between an inner ring and an outer ring, and transmits rotation in only one direction by its wedge action. It has been like that.

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 pressing mechanism 61 and a feed roller pressing mechanism 62 described later.
, So as to be selectively pressed against 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 transmitted in two systems by a small-diameter pulley 31 and a large-diameter pulley 32 fixed to an output shaft 30a (FIG. 2). That is, the first system includes the small-diameter pulley 3
1 is fixed to one end of a relay rotary shaft 35 disposed in parallel with the back feed rotary shaft 16, the feed rotary shaft 17, and the like by an endless annular V-belt 33 looped upward. Relay pulley 36
, And from there via a second relay pulley 38 fixed to the other end of the relay rotary shaft 35 to an input pulley 41 arranged on the input side of a speed reducer 40 described later by a V-belt 39. You. And 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 which is adapted to function as a torque keeper, and from there, the timing belt 4
4 is transmitted to the input side (outer ring side) of the one-way clutch 45 described above.

A second system for transmitting the rotational driving force of the cam motor 30 includes a band end processing unit 80 formed by an endless annular V belt 34 wrapped around the large-diameter pulley 32 obliquely upward. Are 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 brake 4.
8 to the camshaft 90 (FIG. 2) of the band end processing unit 80, whereby the front grip 81, the rear grip 82,
Press 84, slide table 85, slide guide 8
In addition to the above, a well-known movable member of this type of packing machine, such as a heater, 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.
When the electromagnetic clutch 47 is OFF and the electromagnetic brake 48 is ON, the above operation is held at the stop position.

In the present embodiment, in addition to the overall structure described above, in the present embodiment, the back-feed presser mechanism 61 and the feed-roller press mechanism 62 attached to the roller support housing 15 are used to hold the back-feed presser. The roller 53 and the feed pressing roller 54 are selectively pressed against and separated from the oblique lower portions of the back feed roller 51 and the feed roller 52, respectively.

That is, as shown in FIGS. 3 and 4, the back feed pressing roller 53 and the feed pressing roller 54 are individually supported members 55.
A, 56A is rotatably supported by support shafts 55, 56 fixed to the support members 55A, 56A, the two support members 55A, 56A are eccentric to the holding rollers 53, 54, more specifically, the two holding rollers 53, 54 rotation axes P,
The eccentric shafts 57 and 58 having rotation axes X and Y eccentric with respect to Q and having both ends rotatably supported by the roller support housing 15 are fixed to one ends of the eccentric shafts 57 and 58, respectively. The base ends of the swing arms 67, 68 are fixed to these eccentric shafts 57, 58, and solenoids are inserted into elongated holes 67a, 68a formed in the swing ends of the swing arms 67, 68. Rods 63a, 64a of the type actuators 63, 64
Pins 65 and 66 inserted through are loosely inserted,
The linear movement in the vertical direction of the operating rods 63a, 64a is converted into the rotational movement of the eccentric shafts 57, 58 via the swing arms 67, 68, whereby the back feed press roller 54 and the feed press roller are converted. 55 are selectively pressed against and separated from the back feed roller 51 and the feed roller 52, respectively.

More specifically, when the built-in solenoids are not energized and energized (when they are OFF), the solenoid type actuators 63 and 64 are turned on.
The operating rods 63a and 64a are greatly protruded by the biasing force of the springs incorporated therein, as shown by the dashed line in FIG. Accordingly, at this time, the swing arms 67 and 68 also assume the positions shown by the dashed lines in FIG. 4, and accordingly, the pressing rollers 53 and 54 move the back feed rollers as shown by the dashed lines in FIG. 51, a position separated from the feed roller 52;

On the other hand, when the built-in solenoid is energized (ON), as shown by a solid line (or broken line) in FIG. 4, the operating rod 63a is opposed to the biasing force of the built-in spring. , 64a are drawn inward. Accordingly, at this time, the swing arms 67 and 68 take positions as shown by solid lines (or broken lines) in FIG.
7 and 58 rotate by a predetermined angle from the OFF position, the supporting members 55A and 56A swing, and the pressing rollers 53 and 54 are moved back and forth as shown by solid lines in FIG. Pressed against.

The outer peripheral surfaces of the back feed roller 51 and the feed roller 52 are made of urethane rubber in which the band B does not easily slip. Therefore, the back feed roller 51 and the back feed pressing roller 53
, And between the feed roller 52 and the feed holding roller 54, the band B is sandwiched, and the back feed roller pressing mechanism 61 and the feed roller pressing mechanism 62 are selectively provided as described later. By actuating the band B, the band B can be accurately fed and retracted at any timing without causing slippage.

In the packing machine 1 of the present embodiment configured as described above, when packing the object to be packed W with the band B, the power supply of the control device (not shown) is turned on and the auto insert (the band B Feed roller 5 at the tip
2 is automatically sent out from the reel unit to the position passing through 2), the high-speed feed motor 10 is started to rotate its output rotary shaft 10a in the forward direction, and the feed roller press-contact mechanism. 62 solenoid type actuator 64 operates (ON)
I'm sick.

Thus, the high-speed feed motor 1
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 is transmitted via the pulley 22.
2 and the feed roller 52 rotates in the forward direction (feed direction). At this time, the operating rod 64a of the solenoid type actuator 64 is retracted inward, and the swing arm 68 swings from the position shown by the one-dot chain line to the position shown by the broken line in FIG. The 58 and the supporting member 56A rotate by a predetermined angle (counterclockwise 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 actuator 63 of the back-feed roller roller pressing mechanism 61 is turned off, and the back-feed pressing roller 53 is connected to the back-feed roller 5.
1 are separated from each other.

By the above-described operation, the tip of the band B (the cut portion at the time of the previous packing) passes through the lower surface side of the work table 4 and then goes around the article W while being guided by the gate-shaped arch portion 5. And is fed between the slide guide 86 of the band end processing unit 80 and the slide table 85, and is located at the end of the slide guide 86 in the feed direction, and is a proximity switch for detecting the completion of feed. (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 non-pressed back feed pressing roller 53, and guide surfaces 59a and the like of the guide member 59. Guide 84 and press 84 of band end processing unit 80 while being guided by
And it is sent out so as to pass through between the rear grip 82.

Then, band B is set by the proximity switch.
Is detected, the high-speed feed motor 10
Is temporarily stopped, and the solenoid type actuator 64 of the feed roller pressing mechanism 62 is
The state is set to the FF state. 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 one-dot chain line in FIG. 4). Thereafter, the cam motor 30 is started 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 camshaft 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 the tip of the band B is detected as being held by, for example, an ON operation of a limit switch (not shown) for confirming the work operation origin provided in connection with the camshaft 90, High-speed feed motor 1
0 is restarted, the output rotary shaft 10a is rotated in the direction opposite to the direction at the time of sending the band, and the solenoid type actuator 63 of the back-feed roller pressing mechanism 61 is operated (ON).

As described above, 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 transmitted through the pulley 22. The rollers 51, 52 are transmitted to the feed rollers 52,
Rotate in the reverse direction (retraction direction), and further, the operating rod 63a of the solenoid type actuator 63 is retracted inward to move the swing arm 67 from the position indicated by the dashed line in FIG. 4 to the position indicated by the solid line in FIG. Eccentric shaft 57 and supporting 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
Since the one-way clutch 45 is rotated faster than the rotational speed at which the one-way clutch 45 is engaged, the one-way clutch 45 (between the inner and outer wheels) is in a slipping state, and from the cam motor 30 via the timing belt 44. Is not transmitted to the rotating shaft 16 of the back feed roller 51.

By the above operation, the surplus amount of the band B is pulled back at a high speed and a low torque while being sandwiched between the back feed roller 51 and the back feed pressing roller 53 pressed against the same. Is performed. Here, the band guide 70 is normally
9, the inner wall surface 5c of the horizontal portion 5b of the arch portion 5 is brought into contact with the inner wall surface 5c by the rightward urging force of the coil spring 76 in FIG.
A closed space passage for guiding and holding the band B is formed between the groove c and the guide groove 70a. At the time of primary tightening, the band B is tightened, and the band guide 70 is appropriately deformed while the coil spring 7 is being tightened.
9 is horizontally moved to the left as shown by a two-dot chain line in FIG. 9 to create a gap between the guide groove 70a and the side wall. Drawn from.

On the other hand, in the vertical portion 5a, the band guide 70 is always kept at the vertical portion 5a of the arch portion 5 by the urging force of the lifting spring 79, as in the case of the center support means 71. Is brought into contact with one of the inner side wall surfaces 5c.
The band B guides and guides between the guide groove 70a.
A closed space passage to be held is formed (see FIG. 7). And at the time of primary tightening, the band B is tightened,
The band guide 70 is horizontally moved to the left in FIG. 7 against the urging force of the coil spring 76, and a gap is formed between the guide groove 70a and the side wall. At this time, the band guide 70 comes into contact with the vertical portion 77a 'of the crank portion 77a of the guard 77, and is prevented from further moving leftward. As described above, the crank portion 77a functions not only as a support for the band guide 70 but also as a stopper.

As described above, the band guide supporting mechanism according to the present invention has a simple structure with a small number of components and supports the band guide via the relatively weak elastic supporting member. The band can be smoothly pulled out even with a small primary tightening force. When the band B comes into contact with the outer peripheral surface of the article to be packed W by the primary tightening and the surplus of the band is returned, and the tension acting on the band B sharply increases, the load acting on the high-speed feed motor 10 is reduced. As the size increases, the frictional force between the back feed roller 51 and the band B sharply increases, whereby the friction clutch 25 slides out and the back feed roller 51 driven by the high speed feed motor 10 The rotation speed of the rotating shaft 16 rapidly decreases.

When the rotation speed of the rotary shaft 16 decreases to the rotation speed of the one-way clutch 45 being rotated by the cam motor 30 on the outer ring side, the sprags of the one-way clutch 45 mesh with each other. The rotation 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 in a state of being sandwiched between the back feed roller 51 and the back feed pressing roller 53 to perform secondary tightening. . When the band B is tightened to a certain extent, the friction clutch 42 provided on the input side of the speed reducer 40 starts to slide, thereby preventing the object W to be packed from being excessively tightened by the band B. .

After the secondary tightening has been performed in this manner, in the band end processing unit 80, the rear end of the band B is held by the rear grip 82, and the front end and the rear of the band B are heated by the heater. Heat melting of the polymerized portion with the end, press-bonding of the melted polymerized portion by press 84
Cooling, cutting of the rear end of the band B, and the like are performed in a known manner and procedure, whereby the article to be packed W is packed by the band B.

Although one embodiment of the present invention has been described in detail, the present invention is not limited to the above-described embodiment, and various designs can be made without departing from the present invention described in the appended claims. Changes can be made. For example, it goes without saying that the center support means 71 may be provided not only at one place but also at a plurality of places.

[0041]

As will be understood from the above description, the packing machine of the present invention can reliably and smoothly pull out the band from the band guide with a relatively small tightening force at the time of primary tightening. In addition, the whole can be configured inexpensively and simply.

[Brief description of the drawings]

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

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

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

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

FIG. 5 is a schematic front view of the packing machine of the embodiment, in which a band guide frame member on the near side is cut away to show the entire inside of the band guide mechanism.

FIG. 6 is an enlarged view of a main part of a VI section in FIG. 5;

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6;

FIG. 8 is an enlarged view of a main part of a part VIII in FIG. 5;

FIG. 9 is a sectional view taken along the line IX-IX in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 4 ... Work table 5 ... Arch part 5c ... One inner side wall surface 5d ... The other inner side wall surface 70 ... Band guide 71 ... Center support means 72 ... Guide rod 73 ... Support guide 76 ... Coil spring 77 ... Guard 78 ... Lifting rod 79: Lifting spring 89: Lifting means 95: Side support means B: Band W: Packed object

Continuation of the front page (56) References JP-A-2-219713 (JP, A) JP-A-62-146117 (JP, A) JP-A-5-65119 (JP, A) JP-A-63-13802 (JP) , U) Jikku Sho 64-4647 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65B 13/06 B65B 13/18 B65B 13/14

Claims (2)

(57) [Claims] 1. An arch part ( 5 ) placed on a work table ( 4 ) and wound around a package ( W ) to arrange a band ( B ) , and said arch part ( 5 ) has an arch part ( 5 ) inside said arch part ( 5 ) . band
Band guide ( 7 ) in which ( B ) is removably inserted
0 ) and the band guide ( 70 ) with the arch part ( 5 ).
While the band guide support mechanism for elastically supporting order to internal side wall surfaces (5c) constantly biased in the direction of the, in the packaging machine wherein the band guide support mechanism, the band guide (7
0) of the center support means for slidably supported in the width direction (71), to prevent excessive movement of the band guide (70), and swingably suspended and supported in the arch portion (5) Side support means ( 95 ) , the center support means (71) is provided with the arch part (5).
Attached to the other inner side wall surface (5d) of the cantilever.
The rod (72) and the band guide (70)
Wearable and slidable along the guide rod (72)
Support guide (73) and the guide rod (72)
The support guide (73) is fitted outside and
Coil spring constantly biased in the direction of the side wall surface (5c)
(76) A packing machine comprising: 2. The side support means ( 95 ) includes a guard ( 77 ) appropriately shaped to restrict excessive horizontal movement of the band guide ( 70 ) , and the arch part.
A lifting rod ( 7 ) swingably supported by ( 5 )
8 ) and one end ( 79a ) are locked to the lower end of the lifting rod ( 78 ) , and the other end ( 79b ) is connected to the band guide.
The packing machine according to claim 1 , further comprising a lifting means ( 89 ) comprising a lifting spring ( 79 ) locked to the ( 70 ) .