JPH062494B2 - Packaging equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging device in which merchandise and other commodities are stored in a foam styrene tray, and a film is placed on the tray to wrap the product.

(Prior Art) As is well known, in supermarkets, many kinds of products such as meat, fruits, vegetables, and fish are displayed and sold in large quantities. Normally, these products are stored in a styrene tray. Then, it is covered with a polyethylene film from above.

Thus, such packaging is carried out by a packaging device in a backyard of a supermarket or the like, but such a technique is automated, for example, Japanese Patent Publication No. 50-15.
As shown in Japanese Patent Laid-Open No. 192, a large amount of processing is performed in a flowable manner.

The automatic wrapping operation will be briefly described with reference to FIG. 1. The tray 3 containing the goods (not shown) transferred through the transfer path 2 by the conveyor 1 as the tray transfer means is transferred to the lifter 4 at the tip. Rises, is supplied to the packaging device 5, and is subjected to a predetermined packaging operation.

In this case, the wrapping film 11 is transferred from the film roll 7 provided on the side portion of the device 6 via the guide roller 8 and the feed belts 9 and 10 and is positioned at the set position in the wrapping position 5 so that the lifter 4 is moved. By the ascending, the tray lifts and stops the packaging film 11 waiting on it, and the folding arm 13 that advances along the guides 12 and 12 provided on the upper part of the tray advances, whereby the rear fixed arm 14 A pair of folding levers 14 ′, 14 ′ whose base ends are pivotally supported together inwardly via cam rollers (not shown) engaged with the long grooves thereof, so that the wrapping film 11 is placed inside the tray 3 on both sides. From the bottom to the bottom of the tray 3 by the forward movement of the folding arm 13 which is forwardly moved along with the folding. Go folded to the front from the lower side of the tray 3.

Then, the feed belt 15 provided on the upper portion advances the tray (it is moved in the direction opposite to the direction in which the tray is transferred), so that the packaging film 11 on the front side of the tray is further laid horizontally. The front bar 16 folds backward at its bottom.

Therefore, at the bottom, the packaging film is folded in order from the four side surfaces of the tray, welded by the heater 18 installed below the conveyor belt 17 next to the tray, and transferred from the conveyor 19 to the weighing device of the next stage. It is designed to go. (This packaging mode is generally called stretch packaging).

(Problems to be Solved by the Invention) In such a packaging device 6, as described above, the length of the packaging film 11 transferred to the packaging position 5 is manually controlled by an operator such as a button operation and a switch operation. The solenoid 20 is actuated by the adjustment by the control means, and the cutter 22 is actuated via the link 21.

Therefore, if there are various sizes of the tray 3 such as four and five, it is necessary for the operator to set the dial according to the tray size each time.

Therefore, there is a drawback that the work is extremely complicated,
Further, there is a drawback that an operation error is relatively likely to occur due to the manual operation, and the packaging trouble due to the error is inevitable.

Therefore, there is also a disadvantage that the packaging yield is poor and the cost is high because the product is repackaged.

The object of the invention of this application is that even if the tray size is random, the transfer of the packaging film from the film roll can be reliably performed, and the positioning of the packaging film to the packaging position can be performed accurately. The purpose of the present invention is to provide a packaging device that can be used.

(Means for Solving the Problem) In order to solve such a problem, the present invention conveys the cut film to a packaging position, and a cutter that cuts the film fed from a film roll into a predetermined length. Film transporting means, tray transporting means for loading the tray below the transported film, lifter for pushing up the loaded tray toward the film at the packaging position, and means for wrapping the pushed up tray with a film of a predetermined length In the packaging apparatus including the above, a sensor for detecting the tray size is provided in the transport path of the tray transport means, and a film having a length corresponding to the tray size is fed from the film roll based on the detection signal of the sensor. When the cut film is conveyed to the wrapping position, the cutter is activated. The transport means is stopped.

(Embodiment) Next, an embodiment of the invention of this application will be described with reference to the drawings starting from FIG.

The same parts as those shown in FIG. 1 will be described using the same reference numerals.

The embodiment shown in FIG. 2 is a mode of a packaging device 6 ', and most of the modes are the same as the conventional mode of FIG. 1 described above, and tray conveying means connected to the lifter 4 in the preceding stage of the packaging position 5. On the case floor of the conveyor 1 as a photo coupler 23, 23 as a sensor for detecting the tray size.
Is basically different in that the set number is horizontally installed, and a horizontal bar fixed to the rear part of the pair of slide guides 12, 12 provided along the longitudinal direction on the base side of the device 6 '. The base ends of a pair of folding levers 14 ', 14' with respect to 14 are pivotally supported in a pivotable manner, and the slide guide 1
Folding levers 14 'and 14' are pivotally supported by pins on a folding bar 13 which is provided so as to be movable back and forth in parallel with reference numerals 2 and 12, and can be opened and closed.

Also, a film roll 7 is provided on one side of the packaging device 6 '.
Is provided so that the packaging film 11 is transported to the packaging position 5 above the lifter 4 via the feed belts 9 and 10 as film transport means.

Then, the tray 3 is transferred along the transport path 2,
When the photo couplers 23, 23 ... Detect the tray size in the width direction, the wrapping film 11 is sent out from the film roll 7 by the control described below, cut by the cutter 22 to a set size, and the wrapping position by the feed belts 9, 10. Delivered to 5.

On the other hand, the tray 3 lifted by the lifter 4 abuts and lifts the packaging film 11 from below, and then the folding levers 14 ', 14' in the open state move forward along the slide guides 12, 12. Folding lever 13
The wrapping film 11 is folded from the lower side of the tray 3 in the left-right direction by engaging with the cam rollers of the above and gradually moving toward each other, and then by the folding bar 13 which advances forward.
By folding the back side of the packaging film 11 forward and then the feed belt 15 feeds the tray 3 forward,
The folding bar 16 folds the packaging film 11 to the rear side.

In this way, the tray 3 is transferred to the front belt conveyor 17 in a state where it is fully packaged, and the heater 1 below it is transferred.
8, the bottom surface of the packaging film 11 is welded and sealed,
Then, it is moved by the conveyor 19 to the next weighing process.

Then, as shown in FIG. 3, each of the photo couplers 23,
Reference numeral 23 is connected to a multiplexer 25 so as to input a tray detection signal. Further, the selection signal generator 24 is connected to the multiplexer 25 and outputs a film feed start signal. The switch 26 is also connected to input a start signal.

The multiplexer 25 is connected to a counter 27 to which the reset signal R is input, and counts the number of photocouplers 23 that have detected the presence or absence of the tray.

The counter 27 is connected to a first decoder 28 which outputs a timer value for feeding the cut film to the wrapping position 5, and feeds the wrapping film 11 from the film roll 7 to a predetermined length. It is connected in parallel to the second decoder 29 that outputs the timer value required for.

The film feed start signal S from the limit switch 26 is input to the timer counter 30 together with the reset signal R and the clock signal C, and the timer counter 30 feeds the film from the film roll 7. A count value corresponding to the payout length is output.

The first decoder 28 and the timer counter 30 are connected to a first comparator 31, and the output value corresponding to the film transport time (feeding time) from the timer counter 30 and the first decoder 28 are connected. Output value, that is, the output value corresponding to the time required for the unrolled film to be conveyed to the packaging position, and the output value from the timer counter became equal to the output value of the decoder 28. At this time, the feeding of the feed belt 10 as the film conveying means is stopped, and the stop signal S ₀ for positioning the cut packaging film at the set packaging position is output, and at the same time, the counter 27 is reset.

On the other hand, the second decoder 29 and the timer counter 30
Is connected to the second comparator 32, and the output value corresponding to the film feeding time (feeding length) output from the timer counter 30 becomes the second decoder 29.
When the set value is larger than the output value corresponding to the tray size output from, or when they match, that is, when the film size corresponding to the tray size is reached, the cutting signal S ₁ is output to the solenoid 20, The cutter 22 is operated via the link 21 to cut the packaging film 11.

Therefore, when the tray 3 moving on the conveying path 2 in the preceding stage of the packaging position 5 passes through the group of photocouplers 23, the presence or absence of the tray is detected by the photocouplers 23, 23 ... And inputted to the counter 27 via the multiplexer 25. , The number of photocouplers 23, 23 ... Detected as having a tray is counted, and subsequently, the film of the required length corresponding to the second decoder 29 and the second comparator 32 is cut, and further, the first The decoder 28 and the first comparator 31 convey the cut packaging film 11 to a predetermined packaging position and stop it.

In this way, the tray 3 that is lifted by the lifter 4 as described above is sealed with the packaging film 11 as described above, welded by the heater 18, and fed to the next-stage weighing process.

The above-described embodiment is a mode in which the tray size is detected by the sensor during the transportation, and the lifter 4 feeds the package to the packaging position 5 for packaging. In this mode, however, the period from the detection by the sensor to the packaging is performed. A certain processing time is required for the process.

By the way, in the transport path 2, since the trays 3 are generally fed continuously, when one tray 3 is detected by the sensor, it is detected first and waits on the lifter. It is more efficient for the tray 3 to be packed before the subsequent trays are fed to the lifter.

Therefore, as in the embodiment shown in FIG. 4, the first and second registers 33, 33 are provided between the counter 27 and the first decoder 28.
When 34 is connected in series and a film feed start signal is input, a count value corresponding to the tray size counted via the multiplexer 25 is input to the first register 33, and the next tray size is counted by the counter 27. Then, when the output signal is input to the first register 33,
The count value of the preceding tray 3 stored in the register 33 of the second
When the tray 3 is shifted to the register 34 and delayed by one cycle so that the size of one tray 3 is detected by the sensor, the preceding tray 3 is wrapped with a film having a predetermined length corresponding thereto, thereby improving the working efficiency. The work time can be well overlapped so that they can be processed.

The embodiment of the invention of this application is not limited to the above-mentioned embodiments, and for example, as a sensor, in addition to the photocoupler, a microswitch, a reflection type or a transmission type photosensor, or the like can be adopted. The aspect of can be adopted.

(Effect) As described above, according to the invention of this application, the tray size is automatically detected by the sensor installed in the transfer process in the transfer path provided in the preceding stage of the tray packaging process.
Depending on the detected size, there is an excellent effect that the feeding length of the packaging film from the film roll set in the apparatus can be cut to a length corresponding to the size of the tray.

Furthermore, there is an effect that the cut packaging film can be correctly transferred to the positioning position according to the size, and when the tray comes to the packaging position, various adjustment work such as film feeding is not always required and the packaging film is always correctly packaged. As a result, there is an excellent effect that the commercial value does not drop and packaging mistakes do not occur.

Furthermore, even if the trays to be supplied to the packaging device are programmed in advance and the trays of various sizes are not randomly fed but different sizes are randomly fed, completely different sizes are automatically set. There is an excellent effect that the packaging film of the corresponding length can be transferred to the packaging position according to the above.Therefore, there is no cutting error or packaging error of the packaging film, there is no waste in the consumption of the packaging film, and the packaging yield It also has the excellent effect of being good.

[Brief description of drawings]

FIG. 1 is a perspective view of a packaging device based on the prior art, and FIGS. 2 and below are explanatory views of an embodiment of the invention of this application.
FIG. 1 is a perspective view corresponding to FIG. 1 of one embodiment of the invention of this application,
FIG. 3 is a schematic explanatory view of the control circuit, and FIG. 4 is a partial explanatory view of the control circuit of another embodiment. DESCRIPTION OF SYMBOLS 1 ... Tray conveying means, 2 ... Conveyance path 3 ... Tray, 4 ... Lifter 5 ... Packaging position, 7 ... Film roll 11 ... (Packaging) film, 22 ... Cutter 23 ... Sensor

Claims (1)

[Claims] 1. A cutter for cutting a film fed from a film roll into a predetermined length, a film conveying means for conveying the cut film to a packaging position, and a tray conveying for conveying a tray to a lower portion of the conveyed film. Means and
In a packaging device provided with a lifter that pushes up a tray that has been carried in toward the film at the packaging position, and means for wrapping the pushed up tray with a film of a predetermined length, the tray size is detected in the transport path of the tray transport means. A film provided with a sensor, the film having a length corresponding to the tray size based on the detection signal of the sensor is actuated by the cutter at the time when the film is unwound from the film roll, and further cut based on the detection signal of the sensor. A packaging device provided with control means for stopping the film transport means when the film is transported to the positioned packaging position.