JP4381177B2 - Packing machine - Google Patents

Description

  The present invention relates to a packaging machine suitable for banding cardboard boxes, for example.

As this type, a packing machine described in Patent Document 1 has been known.
In this conventional packing machine, an arch guide is provided on a table, and a forward / reverse roller for supplying a band to the arch guide and pulling the arch guide in a direction opposite to the supply direction is provided. Further, a reverse rotation speed detecting means for detecting the reverse rotation speed on the forward / reverse rotation roller side, a replenishing roller for pulling out the band from the reel and feeding it to the pool box, and a control means for controlling the rotation of the replenishing roller are provided. .

  The control means stores the length of the arch guide in advance, calculates the amount of tension of the band from the reverse rotation speed of the forward / reverse rotation roller, and subtracts the amount of tension from the length of the arch guide to calculate the amount of band usage. Calculate. When the band usage amount is calculated in this way, the control means controls the replenishment roller in order to supply a band corresponding to the usage amount to the pool box.

The reason why the supply amount to the pool box is controlled to be equivalent to the band use amount as described above is as follows. In other words, stocking more bands than necessary in the pool box will bend the band and cause poor supply of the bands, so control the pool amount to the pool box as described above. I have to. In other words, it is necessary to stock a minimum number of bands in the pool box.
JP 49-031496 A

  In the conventional packing machine as described above, it is not considered that the replenishment roller slips with respect to the band. However, in reality, it is impossible that the replenishment roller does not slip with respect to the band. When the replenishing roller slips with respect to the band, the band supply amount per unit rotation of the replenishing roller decreases. Accordingly, if the slip is repeated many times, the band amount in the pool box becomes less than the length of the arch guide. This is because, as described above, only the minimum necessary band amount is stocked in the pool box.

If the amount of the band in the pool box is less than one turn of the arch guide, there is a problem that the band cannot make one turn of the arch guide at the time of supplying the band and packing work cannot be performed.
An object of the present invention is to provide a packing machine in which a shortage of bands in a pool box does not occur even when a replenishment roller slips with respect to a band and the rotation speed of the replenishment roller differs from an actual band supply amount. It is.

The present invention provides an arch guide provided on a table, a forward / reverse roller for supplying a band to the arch guide and pulling the band in a direction opposite to the supply direction, and a reverse for detecting the reverse rotation speed on the forward / reverse roller side. pull the rotation speed detecting means, a welding mechanism for cutting by welding a band while winding the band packed on the table, and the pool box for pooling supplied band arch guide, the band from the reel The length of the refill roller to be fed into the pool box and the length of the arch guide is stored in advance, and the amount of band used is calculated by subtracting the amount of tension from the length of the arch guide after calculating the amount of band pull from the reverse rotation speed of the forward / reverse roller calculating a, and control means for controlling the supply roller in order to replenish the amount equivalent to the pool box The packing machine to the premise.

The first invention presupposes the above packing machine, and measures the time from the start of the band supply to the arch guide, the tip detection means for detecting that the band tip that has passed through the arch guide has reached the normal position. And a control unit, a function for determining whether the band tip has reached the tip detection unit based on the arrival signal received from the tip detection unit, and within a preset time from the band supply start time, It is characterized in that it has a function of controlling the rotation of the replenishing roller in order to replenish a band of a temporary replenishment amount set in advance in the pool box when no arrival signal is input from the tip detection means.

In the invention of this, after a predetermined time which time is preset from the band supply start of the arch guide also when the band tip via the arch guide does not reach the position of the normal is insufficient band in the pool box and it is determined that that can be quickly replenished band set amount to the pool box.
Therefore, even if the replenishment roller slips with respect to the band and the rotational speed of the replenishment roller is different from the actual band supply amount, the band in the pool box does not run out.

In other words, the time that can be confirmed from the start to the arrival of the band by the tip detection means can be calculated in advance from the length of the guide arch and the rotational speed of the forward / reverse rotation roller, so if the time is stored in the control means, the control can be performed. The means can determine whether or not the band tip has reached the proper position within that time. If the tip of the band does not reach the tip detection means within that time, it is assumed that the band in the pool box is insufficient for the time being, and the band is supplied to the pool box. Therefore, the shortage of bands in the pool box is quickly resolved.

  The packaging machine according to the embodiment of the present invention shown in FIGS. 1 and 2 includes an arch guide 2 provided on a table 1 and a pool box 5 for stocking a band 4 pulled out from a reel 3. The pool box 5 allows the band 4 to stock an amount necessary for one round of the arch guide 2.

  Further, a forward / reverse roller 6 for supplying the band 4 drawn from the pool box 5 to the arch guide 2 is provided. The band 4 fed out from the forward / reverse roller 6 is guided to the arch guide 2 and, when the arch guide 2 makes a round and reaches its proper position, the tip detection means detects the tip. 7 is provided. The tip detection means 7 is composed of a switch that is turned on when the tip of the band hits the tip detection means 7. Reference numeral 8 in the figure denotes a welding mechanism for welding and cutting a portion where the bands 4 overlap.

  Further, a supply roller 9 is provided between the pool box 5 and the reel 3, and the supply roller 9 is rotated to pull out the band 4 from the reel 3 and supply it to the pool box 5. Therefore, the amount of the band 4 supplied to the pool box 5 is determined according to the rotation speed of the replenishing roller 9.

  Further, as shown in FIG. 2, the packing machine includes an electric motor M1 for driving the forward / reverse rotation roller 6 and an electric motor M2 for driving the replenishing roller 9. The forward / reverse rotation roller 6 provided in the electric motor M1 is provided with forward / reverse rotation speed detection means 10 for detecting the rotation speed. The forward / reverse rotation speed detection means 10 is the reverse rotation of the present invention. It constitutes number detection means. The replenishing roller 9 provided in the electric motor M2 is provided with a pool supply rotation speed detecting means 11 for detecting the rotation speed.

  Each of the forward / reverse rotation speed detection means 10 and the pool supply rotation speed detection means 11 is connected to the control means 12, and the tip detection means 7 and the electric motors M 1 and M 2 are connected to the control means 12. In addition, a switch 13, a timer 14 and an input means 15 are connected in addition thereto.

  When the ON signal of the switch 13 is input to the control means 12, the control means 12 drives the electric motor M1 and keeps the electric motor M2 in a ready state. Further, when the switch 13 is turned on, the control means 12 starts the counting by operating the timer 14 and measures the time until the tip of the band 4 passing through the arch guide 2 hits the tip detection means 7.

  The input means 15 is the length of one turn of the arch guide 4 in the packing machine, the band feed amount per one time of the pool box 5, or the one-time extra supply amount to the pool box 5 described later. Are stored in the control means 12 in advance.

Next, the operation of this embodiment will be described.
First, the length of one turn of the arch guide 4 in the packaging machine via the input means 15, the time for the tip of the band 4 to reach the tip detection means 7 when the forward / reverse rotation roller 6 is rotated at a constant speed, The required feeding amount to the pool box 5 and the temporary supply amount to the pool box 5 once are stored in the control means 12 in advance.

  Then, the band 4 is pulled out from the pool box 5 and the switch 13 is turned on with the front end thereof set on the forward / reverse rotation roller 6. When the switch 13 is turned on, the control means 12 drives the electric motor M1 to perform normal operation. The reverse roller 6 is rotated forward. At the same time, the timer 14 is operated to count whether or not the front end of the band 4 reaches the front end detection means 7 within the time previously stored in the control means 12. If the tip of the band 4 reaches the tip detection means 7 within a predetermined time, there is no problem. That is, although the band 4 is normally set on the arch guide 2, the situation where the band is normally set in this way is defined as the band being set at the origin position.

  When the band is set at the origin position as described above, the package 16 is placed on the table 1, and the control unit 12 is operated again by turning on the switch 13, and the electric motor M1 is driven to reversely rotate the forward / reverse roller 6. Let When the forward / reverse rotation roller 6 rotates in the reverse direction as described above, the band 4 in the arch guide 2 is pulled and detached from the arch guide 2 and wound around the package 16. When the welding mechanism 8 is caused to function in this state, the band 4 is welded and the band 4 is cut to complete the necessary packing operation.

  At this time, the forward / reverse rotation speed detection means 10 detects the reverse rotation speed of the forward / reverse rotation roller 6, but the detection method may directly detect the rotation speed of the forward / reverse rotation roller 6 or the rotation of the electric motor M1. The number may be detected. In any case, the reverse rotational speed signal of the forward / reverse rotation roller 6 detected by the forward / reverse rotational speed detection means 10 is input to the control means 12. The control means 12 that has received the reverse rotation speed signal from the forward / reverse rotation speed detection means 10 calculates the length l of the band 4 drawn during reverse rotation from the signal. Then, (L-1) is calculated from the length L of the arch guide 2 input in advance to the control means 12, and the band 4 consumed to pack the package 16 is calculated from (L-1). To grasp as the amount of.

  Further, since the length (L-l) corresponds to the amount of the band 4 pulled out from the pool box 5, the control means 12 drives the electric motor M2 to rotate the replenishing roller 9, and the consumption length. The band 4 for (L-l) is pulled out from the reel 3 and supplied to the pool box 5. At this time, the pool supply rotation speed detection means 11 counts the rotation speed of the replenishing roller 9 at that time, and inputs the rotation speed signal to the control means 12. The control means 12 that has received the rotational speed signal of the rotational speed of the replenishing roller 9 calculates the band replenishment amount into the pool box 5 from the rotational speed signal, and stops the electric motor M2 when a predetermined amount of replenishment is completed. To do.

  Then, before packing the next package 16, the band 4 is set at the origin position through the same process as described above. At this time, there is no problem if the tip of the band 4 reaches the tip detection means 7 within a predetermined time, but if the tip of the band 4 does not reach the tip detection means 7 within a predetermined time, the arch guide 2 is a failure or the stock amount of the band 4 in the pool box 5 is insufficient.

In any case, if the front end of the band 4 has not reached the front end detection means 7 within a predetermined time, the control means 12 operates as a forward rotation error, drives the electric motor M2, and rotates the supply roller 9. The band 4 is temporarily supplied to the pool box 5, and the control steps for the temporary supply are as shown in FIG.
That is, when a forward rotation error has occurred in which the front end of the band 4 does not reach the front end detection means 7 within a predetermined time, the control means 12 confirms that another forward rotation error has occurred before this forward rotation error occurs. It is determined whether or not there is (step S1). The presence / absence of a forward rotation error is stored in the control means 12. Then, if it is stored that there has been a fact that a forward rotation error has occurred before, a second forward rotation error has occurred at the set timing. When the second normal rotation error occurs in this way, the control means 12 stops the function of the packaging machine and waits for a repair by a person (step S2).

  When the fact of the occurrence of the previous normal rotation error is not stored, the control means 12 determines that the first normal rotation error has occurred within the set timing range, operates the electric motor M2, and supplies the replenishing roller 9 Is rotated, and a preset band amount is temporarily supplied to the pool box 5 (step S3). This temporary replenishment amount is stored in advance in the control means 12 via the input means 15 as described above, but the replenishment amount is at most about ¼ of the length of one round of the arch guide. Is set. When the temporary replenishment is performed as described above, the control means 12 stores the fact that the forward rotation error has occurred (step S4).

  When the temporary replenishment is completed, the control means 12 drives the electric motor M1 to cause the forward / reverse roller 6 to rotate forward again (step S5). And the control means 12 determines whether the front-end | tip of the band 4 reaches | attains the front-end | tip detection means 7 (step S6). If the front end of the band 4 has reached the front end detection means 7, the control means 12 determines that it has returned to the normal state, and waits until the switch 13 is pressed next (step S7).

  If the forward end of the band does not reach the front end detection means 7 even if the forward / reverse rotation roller 6 is rotated forward as described above, the control means 12 reverses the forward / reverse rotation roller 6 and rewinds the band 4 from the arch guide 2. (Step S8), and the forward / reverse roller 6 is further rotated forward (step S9). The reason why the hand 4 is rewound and sent back to the arch guide 2 in this way is that the obstacles in the arch guide 2 may be removed by repeating this operation.

When the forward / reverse roller 6 is rotated forward again in step S9, the control means 12 determines whether or not the tip of the band 4 has reached the tip detection means 7 (step S10). If the tip of the band 4 has not reached the tip detection means 7, the control means 12 stops the function of the packaging machine assuming that automatic repair cannot be performed (step S11), and waits for a repair by a person. .
If the tip of the band 4 has reached the tip detection means 7, the control means 12 determines that it has returned to the normal state, and waits until the switch 13 is pressed next (step S12).

  Then, when normal operation is performed from step S7 or step S12, for example, when the leading end of the band 4 reaches the leading end detection means 7 continuously two times or more, the control means 12 indicates that the packing machine is completely normal. It is considered that the state has returned to the state, and the data relating to the fact that the forward rotation error has occurred, which is stored in the control means 12, is deleted. Therefore, at this time, even if the forward rotation failure occurs next, the fact that the forward rotation error has occurred in step S1 is not stored. In this embodiment, when the leading end of the band 4 reaches the leading end detection means 7 continuously twice or more, the memory of the forward rotation error is erased as described above. However, the number of times is set in advance. Of course you can.

  Further, in this embodiment, the replenishing roller 9 has a structure that rotates idly when the band 4 runs out of the reel 3. Therefore, when there is no band 4 on the reel 3, the pool supply rotation speed detection means 11 cannot detect the band replenishment amount. Therefore, when the pool supply rotation speed detection means 11 cannot detect the replenishment amount of the band, the control means 12 determines that the band has run out, and informs the operator of this using an alarm device (not shown). Yes. Therefore, in the packaging machine, a special sensor for identifying the end of the band 4 is not necessary.

It is the schematic which shows the structure of embodiment. It is a circuit diagram of an embodiment. It is a flowchart figure which shows the control step of temporary supply.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Table 2 Arch guide 3 Reel 4 Band 5 Pool box 6 Forward / reverse roller 7 Front end detection means 8 Welding mechanism 9 Replenishment roller 10 Forward / reverse rotation speed detection means 11 Pool supply rotation speed detection means 12 Control means 14 Timer

Claims (1)

An arch guide provided on the table, a forward / reverse roller for supplying a band to the arch guide and pulling it in a direction opposite to the supply direction, and a reverse rotational speed detecting means for detecting the reverse rotational speed on the forward / reverse roller side When a welding mechanism for cutting by welding a band while winding the band packed on the table, and the pool box for pooling band supplied to the arch guide is fed into the pool box pull a band from a reel The length of the arch guide is stored in advance with the replenishment roller, the band pull amount is calculated from the reverse rotation speed of the forward / reverse rotation roller, and the band use amount is calculated by subtracting the pull amount from the arch guide length , Contact the amount equivalent to a packing machine provided with a control means for controlling the supply roller in order to replenish the pool box Te, comprising: a front end detecting means for band tip via the arch guide detects that it has reached the proper position, and a timer for measuring the time from the band supply start of the arch guide, control means, from the tip detecting means A function for determining whether or not the band tip has reached the tip detection unit based on the received arrival signal, and when the arrival signal is not input from the tip detection unit within a preset time from the band supply start time , A packaging machine comprising a function of controlling rotation of a supply roller in order to supply a band of a temporary supply amount preset in a box.

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