JPH09315415A - Idle-binding prevention method in stronglytightening/ packing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent band from coming off a packed item, binding a slide table, and ending up being cut or splitting, in an automatic packing machine equipped with a band sealer unit, a normally/reversely rotating feed roller, a band-tightening device which moves in conjunction with the sealer unit, a slide table, and a separator. SOLUTION: By providing the feed roller of a packing machine with a rotation detector which measures an amount of the pullback of band, an amount Rx of pullback in each packing is measured. Also, the measured value is compared with an amount R5 of the pullback of a dummy packed-item whose peripheral length is shorter than that of an aimed packed-item P. In the case of RX>=RS, the band is supplied only a specific length by normally rotating the feed roller, thereafter an idle loop is formed by performing a normal operation such as tightening the band, and the machine is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preventing a band from air-tightening a sealer table in a band packing machine having a strong tightening mechanism.

[0002]

2. Description of the Related Art When band winding is performed on an article to be packed,
In the packing machine in which the feed roller that feeds the band into the arch frame is reversed and pulled back, and then the tightening device is operated, if the object to be packed is not in the fixed position or the band comes off, The band is tightly tightened with the sealer table tied together, and this strong tightening causes the band to split in the longitudinal direction, making it impossible to resend the band for the next process into the arch frame. In addition to the work of removing the air-tightened band, it is indispensable to check the tip end state and to load a new band, and the packing work must be interrupted for a long time. The above-mentioned obstacles occur in addition to the operator's erroneous operation and also when the object to be packed is displaced from a fixed position and stopped on the packing machine, and is unavoidable in the packing work.

[0003]

In view of the fact that it is impossible to completely avoid the cause of the above-mentioned obstacles, the present invention
The tension is not applied to the band even if the tightening operation is performed immediately before it is detected that it is in the air-tied state, and whether the empty wheel is actively formed on the bed to stop the machine. Alternatively, the formed empty wheel is held in a state where it can be easily taken out of the machine so that restarting can be performed reliably and easily.

[0004]

The apparatus to which the method of the present invention is applied includes a sealer unit for cutting and welding the band, and a forward / reverse feed roller for feeding or pulling the band back into the band arch. An automatic packing machine that includes a band tightening device that interlocks with the sealer unit, a slide table, and a separator, and that the band disposed in the arch is pulled back by the reverse rotation of the feed roller and is wrapped around the object to be packed. Therefore, the amount of pullback of the band in the normal packing is substantially constant every time when the circumference of the object to be packed is constant. The present invention compares the band pullback amount for each packing operation within a predetermined time with a set value, and when the pullback amount is larger than the set value, the band is fed out by a predetermined amount and then band tightening and cutting are performed similarly to normal operation. The welding work is performed to form an empty ring, and the slide table and the separator are held in an open state so that the formed empty ring can be easily removed from the packing machine.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, 1 is an automatic packing machine, 2 is a cargo bed, and 3
Is a band guide arch, P is an object to be packed, 4 is a band passage, 5 is a sealer unit, and a rear end pressing rod 6, a hot plate crimping rod 7, and a tip of the band which move up and down facing the back side of the slide table The presser bar 8 etc. are built in. The slide table 9 and the separator 10 are located below the loading platform and move forward and backward at right angles to the paper surface. Reference numeral 11 denotes a band tip detection switch LS3. The hot plate for welding is omitted. In FIG. 2, 21 is a forward rotation drive shaft, 23 is a reverse rotation drive shaft, 2
Reference numeral 5 is a cam shaft drive shaft, and each has a pulley clutch 2
It is driven by a motor 28 and a belt 29 via 2 (CL2), 24 (CL3) and 26 (CL1). The drive shafts 21 and 23 are always connected by counter gears 21a and 23a. Reference numeral 30 denotes a cam shaft driven by the worm wheel 27, which has rods 6, 7, 8 on which a cam plate (not shown) for operating the slide table 9 and the separator 10 is axially attached, and a tightening arm 32 is operated at an end thereof. A coronal cam 31 is provided. The tightening arm 32 is configured to be adjustable, for example, as shown in FIG. 2 of Japanese Patent Publication No. 3-6049, and includes a return spring. Reference numeral 35 is a feed roller axially mounted on the forward drive shaft 21, 36 is a driven roller, and 37 is a proximity sensor which constitutes a rotation detector as a length measuring means of the band pullback amount. Reference numeral 12 is a camshaft start point detection limit switch LS1, and 13 is a camshaft stop position detection limit switch LS2. Reference numerals 15 and 16 denote timers TD1, TD2, and 18 respectively, and CPUs are connected as shown in FIG. The conventional operation of the packing device is as follows. First, the band is arranged in the arch 3 by the forward rotation of the feed rollers 35 and 36, the band feed is stopped by the band tip detection switch 11, and the pressing rod 8 is operated to move up. Next, when the article P to be packed is transported and stopped at the fixed position, the clutches 22 and 24 are reversely operated by the push button PB1 operation or the fixed position detection signal, and the feed rollers 35 and 36 are reversely driven to pull back the band. Subsequently, the tightening arm 32 is operated to further tighten the band by a set length, and then the band is cut and welded. In the above operation, if the article P to be packed does not exist or is not in a fixed position, the band B is wound around the slide table 9 as shown in FIGS.
When the tightening arm 32 operates in this state as shown by the chain line in FIG. 5, the winding band is split and cut, or remains in the split state, and in any case, the re-feeding cannot be performed. The present invention prevents this, and the operation when the slide table or the like is released and stopped is as follows. When the band pullback amount by the feed roller when the packaged items P are normally bound is R _P , the band pullback amount R _S of the packaged item (dummy) S smaller than this is R _S >> R _P. The pullback amount R _X is detected each time as a rotation pulse of the driven feed roller 36 by the sensor 37 and compared with R _S stored in advance. When R _X ≧ R _S , the feed roller is normally rotated to move the band. After unrolling for a predetermined length (Fig. 5), tightening, cutting and welding are performed as in the normal process, and the empty ring A
(FIG. 6), the rotation of the cam shaft 30 is forcibly stopped (the clutch 26 is turned off) by the output of LS2, and the slide table 9 and the separator 10 are released as shown in FIG.

Details of the operation are as shown in the chart of FIG. FIG. 4 is a chart of only the operation mode, and it is assumed that the band is arranged in the arch and the article P to be packed is present on the platform. Dummy package S
It is assumed that the withdrawal amount R _S is already stored in the memory M1 by an operation in the teaching mode or by externally inputting a value serving as a withdrawal reference amount. In the teaching mode, it is set by switching the changeover switch shown in FIG. 3 and operating in the same manner as in the operation mode. In the operation mode, the memory M2 is first cleared by the start push button PB1.ON, and the clutch CL3 is turned on substantially at the same time to input the band pullback operation and the pulse number of the sensor 37 to the memory M2. The operating time of the clutch is t ₁ (slightly longer than the average time required for band winding) set by the timer TD1. Memories M1 (R _S ) and M2 (R _X ) are compared and R _X
If < _RS , the clutch CL1 is turned ON, the band is cut and welded following the operation of the tightening arm 32 by the cam shaft, and the cam shaft is returned to the starting point position and stopped by LS1. After that, the clutch CL1 is OFF and CL2 is O
The band becomes N and is fed into the arch, stopped by the signal of LS3, and the presser bar 8 is raised to hold the tip of the band. If R _X ≧ R _{S according} to the comparison between the memories M1 and M2, the clutch CL2 is set to the timer T by this determination output.
D2 set time t ₂ (time to supply an amount enough to easily remove the empty wheel by hand, for example 0.5
It turns on only for (seconds) and makes a empty ring (Fig. 5). Next, the clutch CL1 is turned on and tightened like normal packing operation, and cutting and welding are performed (Fig. 6). It is stopped (Fig. 7). In this case, an alarm signal may be issued. After the empty wheel A is removed by hand, the normal state can be restored by the return button PB2. According to the first aspect of the invention, since the band is arranged so as to pass through the above-mentioned state, the empty wheel is released onto the luggage carrier or is erected in an unstable manner.

[0007]

[Effect] According to the present invention, the next packing operation can be immediately continued by simply removing the empty wheel standing upright on the bed of the packing machine by hand, and the band tip is always maintained in the same state as in the normal packing. It Further, the band length required for the empty wheel to be formed can be changed by the size of the dummy and the set time of the timer.

[Brief description of drawings]

FIG. 1 is a schematic view of a packing machine of the present invention.

FIG. 2 is a plan view showing a transmission system in the sealer unit.

FIG. 3 is a block diagram of a control system.

FIG. 4 is a time chart showing an operation sequence.

FIG. 5 is a partial plan view showing a state before formation of an empty wheel in an unauthorized state.

FIG. 6 is a partial front view after formation of an empty wheel.

FIG. 7 is a side view showing a state of the separator and the slide table in FIG.

FIG. 8 is a front view of a state in which a band is wound around the slide table.

9 is a side view of the state of FIG.

[Explanation of symbols]

 3 Band guide arch P Object to be packed 5 Sealer unit 9 Slide table 10 Separator 11 (LS3) Band tip detection switch 12 (LS1) Cam axis start point detection switch 13 (LS2) Cam axis stop position detection switch 15 (TD1) Timer 16 ( TD2) Timer 18 CPU 21 Forward rotation drive shaft 23 Reverse rotation drive shaft 21a, 23a Counter gear 25 Cam shaft drive shaft 22, 24, 26 Clutch 27 Worm wheel 30 Cam shaft 31 Coronal cam 32 Tightening arm 35, 36 Feed roller 37 Rotation detection vessel

Claims (2)

[Claims] 1. A sealer unit for cutting and welding a band, a forward / reverse feed roller for feeding or retracting the band into a band arch, a band tightening device interlocking with the sealer unit, a slide table and a separator. In an automatic packing machine in which the band disposed in the arch is pulled back by the reverse rotation of the feed roller and is wrapped around the object to be packed, rotation detection for measuring the pullback amount of the band on the feed roller Is provided to measure the withdrawal amount R _X of each package, and the measured value is compared with the withdrawal amount R _S of the dummy package having a smaller perimeter than the object P to be packed in advance, R _X ≧ R _S In this case, the feed roller is rotated in the normal direction to supply the band for a predetermined length, and then a normal operation such as tightening of the band is performed to form an empty ring. A method to prevent air tying. 2. A sealer unit for cutting and welding the band, a forward / reverse feed roller for feeding or retracting the band into the band arch, a band tightening device interlocking with the sealer unit, a slide table and a separator. In an automatic packing machine in which the band disposed in the arch is pulled back by the reverse rotation of the feed roller and is wrapped around the object to be packed, rotation detection for measuring the pullback amount of the band on the feed roller Is provided to measure the withdrawal amount R _X of each package, and the measured value is compared with the withdrawal amount R _S of the dummy package having a smaller perimeter than the object P to be packed in advance, R _X ≧ R _S In this case, the feed roller is normally rotated to supply the band for a predetermined length, and then the band is formed by performing a normal operation such as tightening of the band.
In this state, the slide table and the separator are released and stopped to prevent the band from being tied up.