JP2834614B2 - Method and apparatus for removing empty packing band in 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 removing a band in a packing machine, and more particularly to a method for activating a start button incorrectly when there is no packing object to be banded and packed. The present invention relates to a method for removing a band that has been pulled back by a pair of rollers that perform band retraction and has been wound on a slide table.

[0002]

2. Description of the Related Art As shown in FIGS. 3 to 9, a conventional packing machine is directly connected to an output shaft 2 of a speed reducer 81 which is connected via an electromagnetic brake 9 to a cam shaft motor connected to a control circuit (not shown). Frame 38 in which camshafts 4 are arranged at appropriate intervals.
a, 38b, and a plurality of cams 39 wedge-fitted to the camshaft 4 to press members 6 provided between the machine frames 38a, 38b.
And a cam 36 for rotating the band guide 7 and the slide table 8 on each press member 6 by the rotation of the cam shaft 4.
a, 36b, 36c, etc., so as to perform a predetermined operation. As shown in FIG. 9, the limit cam 41 is attached to a limit cam shaft 40 extending from the output shaft 2 of the speed reducer 81 in the opposite direction to the machine frame 38a. The limit cam 41
And the limit switches L3, L1 and L2 are respectively connected via brackets 45 to positions where the rods are pushed in by the protrusions of the plurality of limit cams 41a, 41b and 41c. Mounted and configured.

FIGS. 7 and 8 show the original position of each member.
In the state of (1), when a start switch (not shown) is turned on, the camshaft motor starts to rotate, the camshaft 4 and the cam 39 rotate through the speed reducer 81, and the right presser 61 in the press member 6 is raised by the cam 39b. The band tip is gripped between the slide table 8 and the band guide 7 and the left bandway flap 42 are completely retracted at the same time (rear side in FIG. 1). Here, the limit switch L1 is turned on by the limit cam 41b that rotates synchronously with the camshaft 4, and a reverse rotation signal is generated.
The camshaft motor is stopped by the reverse rotation signal of the limit switch L1, the motor connected to the feed roller 43 starts the reverse rotation, and the band is formed by the feed roller 43a and the touch roller 43b which slides and rotates with the feed roller 43a. Is pulled back, the band escapes from the band guide arch on the packing machine body, and is wound around the object to be packed. In the tension arm type band tightening mechanism shown in the drawing, the reverse rotation is arbitrarily set by a timer which is operated by a reverse rotation signal of the limit switch L1. Feed roller 4 after setting time of timer
3 stops rotating in reverse, and the camshaft motor rotates again, so that the limit camshaft 4
The upper limit cam 41b also rotates.
The protrusion b moves and the limit switch L1 is turned off. At the same time, the timer is turned off.

During this time, the tension cam 47 is rotated by the cam shaft 4 which continues to rotate, and the band is tightened by the tension arm 44 having a predetermined length. Then, the left presser 62 of the press member 6 on the cam 39 is
c, grip the band supply end side, and
7 inserts a heater (not shown) on the heater crank 18 into the band overlapping portion, raises the middle presser 63 by the first convex portion of the cam 39a in FIG. 7, and slightly returns the tension arm 44 by the tension cam 47. The tension state of the band is released, and the lower cutter blade 64 provided on the middle presser 63 is linearly and smoothly moved between the band supply end and the upper cutter blade formed at the upper edge of the band passage hole 65 of the right presser 61. The band overlap portion is pressurized and melted together with the heater, and the intermediate presser 63 is lowered once in the first concave portion of the cam 39a, the heater is pulled out, and rises again in the second convex portion. Is pressed and pressed for a certain period of time, and the slide table 8 is retracted by the cam 39d so that the article to be packed can be taken out. Then, the intermediate presser 63 descends on the lower surface of the cam 39a, The members of the band guide 7, the slide table 8, and the left bandway flap 42 also return to their original positions in FIGS. At this time, the limit cam 41c on the limit cam shaft 40 is also rotating, and at the same time when each member returns to the previous position, the limit switch 41 is turned on by the limit cam 41c, a forward rotation signal is generated, and the motor rotates forward. The band is supplied to the outside of the main body through the band passage hole 65 of the right presser 61 by the feed roller 43. Thus, one process of packing is completed.

The normal 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. At the start of the forward rotation, the camshaft 4 continues to rotate while the tension arm 44 is returning, and the tension arm 44 continues to sway and move as shown in FIG. 2), the limit switch L3 is turned ON by the limit cam 41a on the limit cam shaft 40, and the cam shaft motor is stopped by the original position signal. During this time, feed roller 4
By the forward rotation of 3, the band is supplied to the band guide arch on the main body, and the tip of the band reaches below the slide table 8, and one rotation of the cam shaft completes one packing process.

[0006]

Generally, in a packing machine, when an object to be packed is placed on a work table of the packing machine and a start switch is turned on, the packing material is supplied into a band guide arch attached to the packing machine body. The band is pulled back by the band pulling and tightening mechanism in the packing machine body, escapes from the arch, and is pulled back until the band is wound around the object to be packed (primary tightening), and the band tightening further tightens the pulled back band. (Secondary tightening) is performed, and band packing of the article to be packed is performed.

However, during the packing operation, the worker mistakenly presses the start switch, the band comes off the packed object, or the transfer of the packed object is delayed during the continuous packing operation such as an automatic packing line. In some cases, packing without an object to be packed (hereinafter, referred to as “empty packing”) may be performed.

In the conventional packing machine, when the empty packing is carried out, the band is pulled back and the band is tightened and welded to the slide table 8 by the tightening mechanism. Since it is in a state of being wound around without being detached from the band, it hinders the next packing operation, and it was necessary to remove the band by cutting it with scissors.

Further, a guide rail is provided so that both side edges of the leading end of the slide table 8 are in sliding contact with each other. When the slide table 8 retreats, the side edge of the band wheel hits the end face of the guide rail and the slide table 8 further retreats. As a result, it is conceivable that the band wheel comes off from the tip of the slide table 8, but as shown in FIG. 10, the pulled band S wheel falls on the press member 6 below the slide table to hold the band, There is a problem in that the next packing operation may be hindered, for example, by staying in the welding mechanism. If the slide table is set so as not to be restrained during empty packing by the timer for determining the reverse rotation time of the feed roller, a large band S is formed, and one end of the band S is connected to the slide table. When the slide table returns, it stays on the press member due to its own weight, and when the slide table returns, it is sandwiched between the slide member and the like on the press member, and the band tip sent out in the next band supply step abuts on the remaining band. , It will cause trouble.

[0010] For the above reasons, the adjustment of the set time of the timer cannot cope with the removal of the band of the empty package.

According to the present invention, there is provided a band removing method and apparatus for reliably removing a band pulled back and wound on a slide table to the outside of the slide table, that is, on the side opposite to the press member via the slide table, in empty packing. It is intended to provide.

[0012]

In order to achieve the above object, a method for removing a band in a packing machine according to the present invention comprises a mechanism for supplying, pulling back and tightening a band, and a plurality of cams 39 wedge-fitted to a cam shaft. Right presser 61 provided between machine frames,
The press members 6 such as the center presser 62 and the left presser 63 can be moved up and down freely, and the side edges of the press members 6
A slide table 16 which is slidable in contact with a and b is slidably provided, and between the leading end of the slide table and the press member, gripping of the distal end side and supply end side of the elastic band and supply of the band are performed. After the end of the band is provided with a welding mechanism of a band overlapping portion, the band tip fed and circulated by the band supply mechanism is inserted between the slide table and the pressing member, and the band is gripped by the tip holding mechanism. Pulling back the band opposite to the supply direction, winding back the band around the packaged object by pulling back by the tightening mechanism, tightening, gripping the side opposite to the band supply direction, cutting the band supply end, and welding the band overlap portion. In the packing machine, the band overlapping section is pressurized and melted together with the heater, the intermediate presser is lowered once, the heater is pulled out, then raised again, After being crimped is pressed a certain time only command overlap portion, re-re-sliding tape the in presser 62
The lower surface of the slide table is raised to a position where the lower surface of the slide table appears , and the band wound around the tip of the slide table is moved to the slide table 16
Of the band S is pulled out from the end of the slide table by sliding the two side edges of the band S against the guide rails 24a and 24b, and the band S itself is re-elevated by the elastic force of the band S itself on the middle presser that has been raised again. This is a method of removing an empty packing band in which the S wheel is bounced upward and escapes out of the band welding mechanism.

The apparatus for performing the above method has a band feeding, pulling back and tightening mechanism, and a right presser 61 provided between the machine frames by a plurality of cams 39a to 39e which are wedge-attached to a cam shaft. The slide table 1 which can move up and down each press member 6 such as 62, the left presser 63, etc., and can slide out on each press member so that the side edge slides on the guide rails 24a, 24b.
8 are slidably provided, between the tip of the slide table and the press member 6, for gripping the tip and supply ends of the elastic band, cutting the supply end of the band, and welding the band overlapping portion. The band tip fed and rotated by the band supply mechanism is inserted between the slide table and the press member, and after gripping the band tip by the tip gripping mechanism, the band is pulled back on the side opposite to the band supply direction, and the tightening mechanism is provided. Pull back and wind the band around the packaged object, tighten, grasp the opposite side of the band supply direction,
In a packing machine equipped with a mechanism for cutting a band supply end and welding a band overlapping portion, a first convex portion for pressing the band overlapping portion together with a heater on the intermediate pressing cam 39a, and pressing only a melted band overlapping portion for a predetermined time. Following the second convex part to be pressed and crimped, the lower surface of the slide table further projects the middle presser.
An empty packing band removing apparatus for a packing machine, wherein a third convex portion for raising the intermediate presser 62 to a position where the intermediate presser 62 is lowered is formed between the respective convex portions.

[0014]

Therefore, in empty packing, the band pulled back by the reversing roller is wound around the tip of the slide table 16 and the process proceeds to the cutting of the next band supply end and the welding step of the band overlap section. When the tip is immersed in the guide rails 24a, 24b, the slide table 1
6 The band loop wound around the tip comes off from this part.

The band ring falls onto the lower band welding mechanism, but the elastic force of the band S itself generates a force for restoring the band S ring to a perfect circle. It rises and rebounds upward on the intermediate presser 62 at the position of the lower surface of the slide table to automatically escape out of the band welding mechanism.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG.
In FIG. 1A and FIG. 1C, the cam 39a is formed on the lowest peripheral surface with a lower cutter blade 64 provided on the middle presser 63 at the upper edge of the band passage hole 65 of the right presser 61 on the band supply end side. A first convex portion 391 for cutting the band between the cutter upper blade and the band overlapped portion together with the heater to be pressed and melted, and a first concave portion 392 for temporarily lowering the intermediate presser 63 for removing the heater. A second convex portion 393 for ascending again and pressing and pressing only the overlapping portion of the band for a certain time;
Lower the intermediate presser 63 and retreat the slide table 8,
Second concave portion 39 for taking out the article to be packed
4 and the intermediate presser 63 after the slide table 16 has retreated.
Is formed to a position where the lower surface of the slide table protrudes and retracts.

In FIG. 2, reference numeral 16 denotes a slide table.
Both side edges of the slide table 16 are
The slide table 16 is provided slidably in contact with the grooves of the guide rails 24a and 24b attached to the upper surface of the slide table 16b.
Of the guide rails 24a and 24b are provided so as to be freely protruded and retracted from the end faces thereof.

That is, a pin 17 is protruded from the lower surface of the slide table 16, and the pin 17 is fixed to the cam shaft 4 by a cam 39d (FIG. 7). It is engaged with the upper end of the table arm 25.

In FIG. 3, reference numeral 1 denotes a band shooter, which is provided with a forward drive roller 10 and a reverse drive roller 20 at predetermined intervals facing the band shooter 1. The gear 15 provided on the drive shaft 11 is directly connected to the motor 15 with a speed reducer, and the gear 19 having a larger diameter than the gear 19 provided on the shaft 21 of the reverse drive roller 20.
Mesh with. Therefore, the forward drive roller 10 and the reverse drive roller 20 are always rotating in opposite directions.

In FIGS. 3 and 6, reference numerals 13 and 23 denote forward / reverse touch rollers, which are idle rollers, which have substantially the same structure. FIG. The forward and reverse rotation touch rollers are supported by eccentric shafts 86 and 85, and the upper ends of operating rods 90 and 95 are rotatably attached to the ends of the shafts 86 and 85, respectively. , 95 provided at the lower ends of the bent pieces of the L-shaped interlocking rods 91, 96.
2 (92), and is connected to operating rods 90, 95 via springs 93, 93. The lower end of the operating rod 90 is attached to the tip of arm rods 98, 99 having trochanters 94, 97. One end of each of the arm bars 98 and 99 is rotatably supported on a shaft 100 protruded from the machine base, and the other end of a spring 101,
(101) is locked and urged toward the band shooter 1 (FIGS. 3 and 5).

Reference numerals 102 and 103 denote cams, which are mounted on a shaft on which a cam band 4 for operating a known band gripper, a heater (not shown), a center press and the like is extended, and rotators 94 and 97 of the arm rods 98 and 99. Abuts on the interlocking rod 9
1 and 96, and thus are configured to operate in conjunction with the operating rods 90 and 95.

The cams 102 and (102) press the operating rods 90 and 95 via the interlocking rods 91 and 96 to press the forward and reverse rotation touch rollers 13 and 23 against the forward and reverse rotation driving rollers 10 and 20, respectively. Is a nut 89 at the lower part of a spring 93 (93) provided at the lower end of the operating rods 90 and 95.
By rotating (89), the spring 93 (9
Although it can be varied to some extent by adjusting the drag of 3), when a predetermined resistance is applied to the running or pulled back band, the rotation speed of the forward / reverse rotation touch rollers 13 and 23 decreases, and finally the forward rotation drive is performed. The roller 10 and the reverse rotation drive roller 20 slip with respect to the band, and the forward and reverse rotation touch rollers 13 and 23 stop.

The resistance is actually a resistance in which the tip of the band sent out to the forward drive roller 10 and the forward touch roller 13 is caught in the arch or abuts on the slide table switch. For the reverse rotation drive roller 20 and the reverse rotation touch roller 23, the resistance when the band escapes from the arch and is wound around the packaged object due to the reverse rotation.

In FIGS. 3 and 4, the forward rotation touch roller 1 is shown.
3 and the reversing touch roller 23 are provided with rotary discs 30 and 31 serving as cutout semi-circular pulse generating plates integrally therewith, and a pulse generator which faces rotation trajectories of cutouts 32 and 33 of the rotary discs 30 and 31. The barrel speed detecting means 34 and 35 are attached. The rotation speed detecting means 34, 35 can be appropriately selected from a photo sensor, a magnetic sensor and the like, but in the embodiment, it is a kind of proximity sensor, and the cutouts 32, 33 are high frequency transmitting sections of the rotation speed detecting means 34, 35. When it passes between the receiving units, it generates one pulse when it is ON, and discharges from the capacitors connected to the ON units. When the portions other than the cutouts 32 and 33 of the rotating disks 30 and 31 pass between the transmitting unit and the receiving unit. When turned off, one pulse is generated to charge each of the capacitors. If the intervals between the pulses of the rotation speed detecting means 34 and 35 become longer, the rotation speed detecting means 34 and 35
The electronic circuit is configured to generate a signal when the charge amount of the capacitor exceeds the capacity by turning off the solenoid, and a solenoid for bringing the touch roller into and out of contact with a driving roller for band tightening, which will be described later, according to a signal of the rotation number detecting means 34. Is turned ON. The timing of generation of the signal is arbitrarily adjusted by changing the capacitance of the capacitor.

In FIG. 3, reference numeral 51 denotes a tension roller for tightening the band. The tension roller 51 has a part of its circumference facing the rear end of the band shooter 1 and is configured to rotate at a lower speed and higher torque than the forward drive roller 10. The drive shaft 22 of the tension roller 51 is directly connected to a tightening motor 52 composed of a geared motor with a brake attached to the back surface of the substrate 5. 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 metal roller.
An annular member 6 made by using a material having a lower friction resistance and a higher hardness than the elastic body, for example, a Teflon (coating) thrust washer.
The annular member 60 is slightly protruded from the outer periphery of the elastic body 53 by, for example, 0.2 to 0.3 mm.

Reference numeral 54 denotes a touch roller, which is supported by an eccentric shaft 58 and has one end connected to a rod 56 of a solenoid 55 to which a timer T1 is connected, and the other end of a crank 57 connected to the tip of the eccentric shaft 58. The outer periphery of the touch roller 54 can be pressed and separated from the outer periphery of the tension roller 51 by expansion and contraction.

A guide shooter 59 covers a part of the outer periphery of the tension roller 51 via a band passing gap, and has one end on the rear end of the band shooter 1 and the other end on the outer periphery of the touch roller 54. It is installed facing the department.

The set time of the timer T1 is set as a time required for further tightening the band wound around the article to be packed.

Next, the operation of the above embodiment will be described.

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 has reached below the slide table 8. Since the convex portion of the cam 102 is not located at the position where the trochanter 94 is pressed down between the normal rotation drive roller 10 and the normal rotation touch roller 13, there is a gap exceeding the thickness of at least one band. Does not affect bands inside. The relationship between the reverse rotation drive roller 20 and the reverse rotation touch roller 23 is the same. Here, the cam shaft 4 is rotated by the start switch, and the band tip is held by the band tip holding mechanism of the band welding mechanism 50. At the same time, since the cam is also rotating, the operating rod 95 is pushed down via the rotator 97, the arm rod 99, and the interlocking rod 96, and the eccentric shaft rotates in an arc shape, and the reverse rotation touch roller 23 supported by the eccentric shaft is rotated.
Is pressed down and pressed against the reverse rotation drive roller 20. Therefore, the band supply end side in the band shooter 1 is pulled back at a high speed by the pair of rotationally driven rollers (primary tightening).

Reverse rotation drive roller 20, Reverse rotation touch roller 2
The tension roller 51 has already started to rotate by the tightening motor 52 at the same time when the band is pulled back by the band 3, and the band to be pulled back smoothly moves on the annular member 60 having a low coefficient of friction and protruding from the outer periphery of the elastic body 53 of the tension roller 51 in the guide shooter 59. Run while rubbing.

When the band escapes from the arch and is wound around the object to be packed, the reversing touch roller 23 gradually reduces the rotation speed because resistance is applied to the band against the reversing motion, and the rotating disk 31 is rotated. When the rotation speed of the motor decreases, the pulse generation interval by the rotation speed detecting means 35 becomes longer, and the amount of charge to the capacitor exceeds the arbitrarily adjusted capacity, a signal is issued. 5
5 is excited, and the touch roller 54 on the eccentric shaft 58 is pressed against the tension roller 51 via the crank 57.
At this time, the annular member 60 on the elastic body 53 is pressed by the touch roller 54 at both the roller, the portion where the elastic body 53 of the touch roller 54 and the tension roller 51 are pressed and the peripheral surface around which the band is wound around the elastic body 53. Then, the band is pressed into the elastic body 53 via the band, and the band is tightened within the set time of the timer T1 by the peripheral surface of the elastic body 53 having a large frictional resistance. Further, in response to the signal, the cam shaft 4 rotates, the arm rod 99 sways, and the reverse rotation touch roller 2
The pressure contact between the roller 3 and the reverse drive roller 20 is released, and the camshaft 4 stops.

Therefore, it is possible to prevent the surface of the band from being damaged due to the prolonged slip of the reverse rotation roller with respect to a so-called weak band, and to prevent the band from meandering and not to hinder the next band supply.

On the other hand, when the set time of the timer T1 has expired, the band is strongly wound around the object to be packed, and at the same time, a tightening end signal is issued, and the tightening motor 52 is stopped by this signal.
The cam shaft 4 rotates again, the band supply end side is gripped, the excitation of the solenoid 55 is released, and the cam shaft 4 that continues to rotate further causes the first convex portion 391 of the cam 39a in FIG.
As a result, the intermediate presser 63 rises, and the lower cutter blade 64 provided on the intermediate presser 63 smoothly moves the band supply end side linearly with the upper cutter blade formed at the upper edge of the band passage hole 65 of the right presser 61. The band overlap portion is pressed and melted together with the heater, and the intermediate presser 63 is lowered once in the first concave portion 392 of the cam 39a, the heater is pulled out, and is raised again in the second convex portion 393. Only the overlapped portion is pressed and crimped for a certain period of time, so that the slide table 8 is retracted so that the article to be packed can be taken out.
When the intermediate presser 63 is lowered at 94 and the slide table 16 is retracted, the intermediate presser 63 is again raised by the third convex portion 395 of the cam 39a to a position where the lower surface of the slide table protrudes and retracts. Descend. As described above, the band overlapping section is welded by the band welding mechanism 50 and the supply end side is cut.

On the other hand, the rotation of the cam shaft 4 rotates the cam, so that the forward drive roller 10 and the forward touch roller 13 are in the state shown in FIG. 5, the cam shaft 4 temporarily stops, and the band is To bring out the band to the upper surface of the main body.
When the tip of the band comes into contact with the slide table switch below the slide table 8, this switch signal causes
The camshaft 4 rotates again, and stops when each member returns to the previous position. During this time, the contact of the front end of the band with the slide table switch causes resistance to be applied to the forward rotation of the forward rotation touch roller 13 and the rotation speed of the forward rotation touch roller 13 to decrease. On the other hand, slippage occurs, and the forward rotation touch roller 13 stops. During this time, no extra band is sent, and it is possible to prevent an accident such as the band becoming jammed in the arch.

The pulse generation interval of the rotation speed detecting means 34 becomes longer due to the decrease in the rotation speed at which the slippage of the forward drive roller 10 and the stoppage of the forward rotation touch roller 13 occur. Discharged and reset.

When the slide table switch is turned on,
When the band supply is completed, the limit cam interlocking with the camshaft 4 operates, the clutch for transmitting the rotation of the motor to the camshaft 4 via the speed reducer is turned off, and the rotation of the camshaft 4 is stopped. Returns to the old position.

However, if you have done empty packing,
When the camshaft 4 rotates and the cam 39d fixed to the camshaft 4 rotates, the slide table arm 25 slides through the rotator 27 and moves through the pin 17 engaged with the upper end of the slide table arm 25. As a result, both side edges of the slide table 16 slide back on the groove between the guide rails 24a and 24b and retreat. Since the tip of the slide table 16 is completely immersed in the grooves of the guide rails 24a and 24b, the band loop wound around the tip of the slide table 16 is guided as shown in FIG. The slide table 16 is removed from the tip of the slide table 16 while being regulated by the end faces of the rails 24a and 24b. Then, the band wheel comes out of the slide table 16 and, at the same time, tries to restore to a perfect circular state by the elastic force of the band itself. Due to this restoring force, the band ring comes up against the upper surface of the presser 63 inside the welding mechanism immediately below the slide table 16 which is rising again by the third convex portion formed on the cam 39a in FIG. As shown in (1), it jumps out of the welding mechanism outside the slide table and is automatically removed.

The rotation of the cam shaft 4 rotates the cam, so that the forward drive roller 10 and the forward touch roller 13 are rotated.
The state shown in FIG. 3 is reached, the cam shaft 4 stops once, the band is pressed against both rollers, and the band is delivered to the upper surface of the main body. When the tip of the band comes into contact with the slide table switch below the slide table 16, this switch signal causes the cam shaft 4 to rotate again, the intermediate presser 63 to descend again, and stop when each member returns to the previous position.

[0040]

Since the present invention is constructed as described above, in the case of empty packing, the packing band wrapped around the slide table is escaped, and the band is dropped on the welding mechanism. The cause of trouble in the packing work in the process could be eliminated.

[Brief description of the drawings]

FIG. 1A is a partial schematic view showing the operation of the present invention. FIG. 1B is a partial schematic view showing the operation of the present invention when the band ring escapes. FIG. 1C is a partial perspective view showing the intermediate presser cam of the present invention.

FIG. 2 is a perspective view related to a slide table.

FIG. 3 is a side view showing a band supply mechanism.

FIG. 4 is a schematic plan view of a reverse rotation touch roller portion.

FIG. 5 is a longitudinal sectional view of a normal rotation touch roller unit.

FIG. 6 is a partial plan view of FIG. 3;

FIG. 7 is a perspective view showing an original position of each member.

8 (A) is an exploded perspective view showing a band welding mechanism and the like. FIG. (B) is an overall perspective view.

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

FIG. 10 is a schematic view of a main part of the conventional means when the band is dropped.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Band shooter, 4 ... Cam shaft 10 ... Forward rotation drive roller, 13 ... Forward rotation touch roller, 15 ... Motor with reduction gear, 20 ... Reverse rotation drive roller, 23 ... Reverse rotation touch roller, 24a, 24b ... Guide rail, 30 , 31 ... rotating plate, 32, 33 ... notch, 34, 35 ... rotation number detecting means, 39 ... cam, 39a ... middle press cam, 39b ... right press cam, 39c ... left press cam, 39d ... slide table cam, 39e: heater cam, 44: tension arm, 51: tension roller, 52: tightening motor, 54: touch roller, 55: solenoid, 57: crank, 58: eccentric shaft, 59: guide shooter, 61: right holder, 62 ... Middle presser, 63 ... Left presser, 85, 86 ... Eccentric shaft,

Claims (2)

(57) [Claims] A band supply / retraction / tightening mechanism;
Each press member such as a right presser, a middle presser, a left presser and the like provided between the machine frames by a plurality of cams attached to the cam shaft by wedges can freely move up and down, and a side edge slides on the guide rail on each press member. A retractable slide table is slidably provided, between the distal end of the slide table and the press member, gripping the distal end side and the supply end side of the elastic band, cutting the supply end of the band, and forming the band overlap portion. A band tip fed and rotated by the band supply mechanism is inserted between the slide table and the pressing member, and the band tip is gripped by the tip gripping mechanism. Then, the band is pulled back on the opposite side in the band supply direction. Then, the band is pulled back by the tightening mechanism, the band is wound around the article to be packed, tightened, the side opposite to the band supply direction is gripped, the band supply end is cut, and the band overlap portion is welded. In the packing machine consisting of the process, the band overlapping portion is pressed and melted together with the heater, the intermediate presser is lowered once, the heater is pulled out, rises again, and then only the band overlapping portion is pressed and crimped for a certain time, The lower surface of the slide table reappears the intermediate presser again
The band wheel wound around the tip of the slide table is retracted by sliding the side edges of the slide table against the guide rails, and the band ring is pulled out from the tip of the slide table and re-raised again. A method of removing an empty packing band in a packing machine, wherein the band of the band is bounced upward by a resilient force of the band itself on the intermediate presser and escapes out of the band welding mechanism. 2. It has a band feeding, pulling back and tightening mechanism,
Each press member such as a right presser, a middle presser, a left presser and the like provided between the machine frames by a plurality of cams attached to the cam shaft by wedges can freely move up and down, and a side edge slides on the guide rail on each press member. A retractable slide table is slidably provided, between the distal end of the slide table and the press member, gripping the distal end side and the supply end side of the elastic band, cutting the supply end of the band, and forming the band overlap portion. A band tip fed and rotated by the band supply mechanism is inserted between the slide table and the pressing member, and the band tip is gripped by the tip gripping mechanism. Then, the band is pulled back on the opposite side in the band supply direction. Then, the band is pulled back by the tightening mechanism, the band is wound around the article to be packed, tightened, the side opposite to the band supply direction is gripped, the band supply end is cut, and the band overlap portion is welded. In a packing machine having a structure, a first convex portion for pressing a band overlapping portion together with a heater on the intermediate presser cam, and a second convex portion for pressing and pressing only a melted band overlapping portion for a predetermined time, further comprise the intermediate presser. the slide
The third that raises to the position where the lower surface of the id table appears and disappears
An apparatus for removing an empty packing band in a packing machine, wherein each of the convex portions is formed with a concave portion between each of the convex portions.