JPH1179139A - Automatic packaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability for a delivery conveyor belt at a delivery part and to reduce thermal influence working badly on articles erroneously placed on the belt by a method wherein the delivery conveyor belt is made to turn at a specific turning angle at every specified interval during a period of stand-by time at the delivery part whereto packaged articles are delivered from a packaging part. SOLUTION: A control program controlling delivery motion at a delivery part 13 is included in a control means 71 that controls entire operation of a tray packaging apparatus. When judgement is made by the aforementioned program that the control means 71 is in stand-by when there is no tray 17 to be packaged, processing is made so that the delivery conveyor belt at the delivery part 13 is made to turn at a turning angle lagging behind a turning angle in N times one (N is a natural number) in accordance with the number of impressing driving pulse. Therefore, the delivery conveyor belt is not kept in a standstill for a period not more than a period of interval and saved from being heated too much at high temperature with its relative position against an electric heater changed at every specific period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a food store of a department store or a supermarket, etc., and automatically packages a dish-like container (tray) containing an article to be packaged, such as food, using a film. The present invention relates to an automatic packaging device such as a tray packaging device for carrying out.

[0002]

2. Description of the Related Art A tray packaging apparatus includes a tray loading section, a film supply section, a tray packaging section, and a tray transport section. The tray carry-in section composed of a belt conveyor or the like carries the tray containing the articles supplied thereto into the tray wrapping section, and the film supply section takes out the stretchable film and supplies it to the tray wrapping section. . The tray wrapping section folds the transparent stretchable film fed out of the film supply section with respect to the tray conveyed there, from both sides in the width direction and both sides in the longitudinal direction, onto the bottom outer surface of the tray, and wraps the tray. Then, the packaged tray is delivered to the tray unloading section. The tray unloading unit unloads the packed tray to the outside of the tray packaging device, and heats the tray from below during the unloading.

For this purpose, the tray discharge section has a discharge conveyor belt that is rotated endlessly, and an electric heater disposed inside the conveyor belt. By heating the wrapped tray passed over the unloading conveyor belt heated by the heater, the films superimposed on the outer surface at the bottom of the tray are adhered to keep the wrapped state. It has become.

By the way, the carry-out conveyor belt of the tray carry-out section carries out a rotation operation every time a packed tray is delivered from the tray packing section to carry out the packed tray. During the power-on of the packaging device, regardless of the operation state of the packaging device, the temperature is controlled so as to be a predetermined temperature, for example, 130 ° C. even in a standby state in which the packaging and the packed tray are not carried out. ing. In such continuous energization, the electric heater is formed from a heater wire and a radiator board in which the heater wire is embedded, has a considerable heat capacity, and once the heat generation is stopped and the temperature drops to room temperature, This is done to prevent the film from taking a long time to reach a predetermined temperature necessary for heat bonding the film, thereby preventing a reduction in packaging efficiency.

[0005]

During the standby period of the conventional automatic packaging apparatus, the electric heater of the carry-out section continues to generate heat while the carry-out conveyor belt keeps the stationary state. The positional relationship with the upper belt portion of the carry-out conveyor belt, which is mainly heated by this, is relatively fixedly held. However, in an automatic packaging apparatus, a long waiting period is often required in accordance with, for example, a setup such as changing a type of a product to be packaged. In such a case, in the conventional structure in which the relative positional relationship does not change as described above, the surface temperature of the upper belt portion of the carry-out conveyor belt is maintained at a high temperature of, for example, about 130 ° C. Degradation is promoted and durability is not good. In addition, if the unloading conveyor belt is exposed and some kind of article is inadvertently placed on it and left unintentionally, the article is continuously exposed to high temperatures and is thermally adversely affected. There is a possibility.

Accordingly, the problem to be solved by the present invention is to improve the durability of the carry-out conveyor belt of the carry-out section, and even if an article is erroneously placed and left on the carry-out conveyor belt, the object is not heated. An object of the present invention is to provide an automatic packaging device capable of reducing adverse effects.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided an unloading unit for transferring a packaged article from a packaging unit for packaging the article to be unpacked, and an unloading conveyor belt, and the unloading section is arranged inside the belt to be in standby mode. But it has an electric heater that continues to generate heat,
It is assumed that an automatic packaging apparatus that heats and bonds the film folded on the outer surface of the bottom of the packaged article on the conveyor belt at the carrying-out section and carries out the film is carried out.

[0008] In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that when the carry-out section is on standby, the carry-out conveyor belt has a rotation angle other than N times 1 (where N is a natural number) every predetermined time. It is designed to be rotated with a rotation angle.

According to the first aspect of the present invention, not only during the carrying out operation of the unpackaged article by the carry-out section, but also at the time of standby before starting the carry-out operation,
Although the heat generated by the electric heater in the carry-out section is continued, the carry-out conveyor belt is rotated at predetermined time intervals without maintaining the stationary state, and the rotation is N times (where N is a natural number) 1 rotation. Executed with a rotation angle other than the angle. This makes it possible to change the relative position of the carry-out conveyor belt with respect to the electric heater at predetermined time intervals, thereby preventing the upper belt portion of the conveyor belt from being kept stationary and continuously heated during the standby period. With this,
Even if the packaged articles or other articles are mistakenly placed on the carry-out conveyor belt and left unattended, the carry-out operation is performed by the regular rotation of the conveyor belt, and the articles on the belt are carried out. Can be prevented from being carried out of the belt and kept heated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

A tray packaging device 1 according to a first embodiment as an automatic packaging device shown in a perspective view of FIG. 1 has a loading section 11 serving as tray loading means as shown in FIGS.
7, a packaging unit 12 serving as a tray packing unit, an unloading unit 13 serving as a tray unloading unit, a film supply unit 14, a horizontal sensor array 31, a vertical sensor array 32 as a detecting unit, and a control unit shown in FIG. 71.

As shown in FIG. 1, an operation panel 2 is mounted on the upper portion of the front frame 1a of the tray packaging device 1 so as to be exposed on the front surface thereof. The panel 2 is provided with operation buttons 3 for performing various operational instructions and various settings for the tray packaging device 1 and a display unit 4 such as a liquid crystal display device. . For example, the display unit 4 displays the setting contents at the time of setting, and displays the number of packages during packaging.
In FIG. 1, reference numeral 5 denotes a cover which is detachably provided to cover the packaging unit 12 from above.

The loading section 11 is horizontally disposed so as to pass through a tray loading port 1b formed in the front frame 1a of the tray packaging apparatus 1 shown in FIG. This loading unit 1
1 has a plurality of belts 16a which are arranged at intervals in the left-right direction (width direction) and synchronously rotated by the power of the stepping motor 15, as shown in FIGS. It has a carry-in belt conveyor 16, the front part of which is located outside the front side of the front frame 1a, and the rear part of which is the front frame 1a and the rear frame 1c
(See FIG. 3).

The front portion of the carry-in section 11 is used as a tray supply section, in which a tray 17 containing an article A to be packaged, such as fresh food or the like, as shown in FIG. Supplied. The tray 17 is a shallow or deep dish with an open top.

A wall which the carry-in section 11 has at one end in the width direction, for example, a vertical wall 35 on the right side when viewed from the front is a wall serving as a reference when the tray 17 is supplied.
As shown in FIG. 5, a supply switch 36 as a start switch is provided. The switch 36 is a pressing type and has a considerably large area, and the supply switch 36 is turned on when the side surface of the tray 17 is pressed against it. Thereby, the motor 1
5 is driven, the carry-in belt conveyor 16 starts the carrying operation, and the tray 17 is carried toward the packaging unit 12. The rear part of the loading section 11 is the front and rear frames 1
a, located in the packaging part 12 provided between 1c,
The tray 17 carried in by the carry-in part 11 is supplied to the packaging part 12.

The wrapping section 12 holds a tray 17 positioned in the wrapping section 12 upward from the rear portion of the loading section 11 and a film supply section 14 (FIG. 4) provided below a below-described unloading section 13. The transparent stretch film F that can be stretched and unwound from the tray 1 is measured from the tray 1 measured.
7, the film F is drawn out according to the size of the film F and expanded in the width direction thereof. It is to be packed.

The wrapping unit 12 for performing the automatic wrapping operation is known, but will be described with reference to FIGS. Between the front and rear frames 1a and 1c of the tray packaging device 1, a front gripper 61 that pulls out the leading edge of the film F and pulls it out.
And a pair of side grippers 62 for individually gripping the widthwise side edges of the drawn-out film F and extending the film F. The front gripper 61 is moved along the guide rail 63 in a direction in which the front gripper 61 comes into contact with and separates from the unloading section 13. When the gripper 61 pulls the gripped film F on the inner surface of the film gripper 61 a that opens and closes. Is provided with a grip rubber (not shown) for preventing the film F from being pulled out.

The pair of side grippers 62 includes a drive mechanism 6
4, the film F is moved in a direction perpendicular to the drawing path of the film F toward each other and away from each other. These grippers 62 are provided side by side with a plurality of film grips 62a that open and close.
A grip rubber 65 is provided on at least one inner surface of a to prevent the film F from being pulled out when the sandwiched film F is stretched. In FIG. 5, reference numeral 66 denotes an elevating body 67, a movable support 68 supported by the elevating body 67, and a driving mechanism 69 for elevating the elevating body 67.
And is disposed at the rear of the carry-in section 11 so as to form a part of the packaging section 12. Movable support 6
Numeral 8 maintains the self-standing state by the force of the spring at normal times, and tilts when pushed from the side by the side gripper 62 so as not to hinder the folding operation of the film F by the side gripper 62.

The film F is pulled out by the reciprocating movement of the front gripper 61 so as to be positioned above the movable support 68. Next, after the edges on both sides in the width direction of the film F are sandwiched by a pair of side grippers 62, When the side grippers 61 are retracted, the drawn film F is preliminarily stretched as shown in FIG. In this state, the tray 17 carried into the movable support 68 from the carrying-in section 11 is lifted by the lifting operation of the lifter 66, and is pushed up while further extending the film F being drawn. Next, the pair of side grippers 62 approach each other and enter the lower side of the bottom outer surface of the tray 17 to fold the film F into the bottom outer surface of the tray 17 from both sides in the width direction, and then release the grip of the film F. It retreats away from each other and returns to its initial position. Thereafter, the front gripper 61 is moved in the direction of the unloading section 13, enters the lower side of the bottom outer surface of the tray 17, folds the film F from one longitudinal side thereof to the bottom outer surface of the tray 17, and removes the tray 17 from the unloading section. 13, the film F is released from the grip and then retracted and returned to the initial position. As a result, the film F is folded in the carry-out section 13 below the bottom outer surface of the tray 17 that rides on it. Thus, the film F is folded into the bottom outer surface of the tray 17 from both sides in the longitudinal direction, and the packaging is completed by the automatic packaging operation described above.

As shown in FIG. 4, the film supply unit 14
A lower lever 20a supporting at one end a roll 18 on which a stretch film F is wound, a first guide roller 19a for guiding the film F fed from the roll 18, and a pivotally supported other end; It has a film guide mechanism 21 disposed above, and an upper lever 20b having one end supporting a second guide roller 19b for guiding the film F toward the mechanism 21 and the other end supported by the film guide mechanism 21. ing. The film F pulled out from the roll 18 is set so as to pass through the film guide mechanism 21 via the guide rollers 19a and 19b, and the lifter 66 of the packaging unit 12 is moved by the movement of the front gripper 61 of the packaging unit 12. It is to be pulled up. In addition, the film portion from the second guide roller 19b to the film guide mechanism 21
And is guided along the lower side of the carry-out portion 13 in close proximity to the lower surface of the discharge portion 13. The film guide mechanism 21 has a cutter 22, and the film F pulled out by the raising operation of the cutter 22 immediately after the completion of the packaging is cut.

As shown in FIG. 3, the carry-out section 13 is provided continuously with the packing section 12 so as to be continuous at right angles to the carry-in section 11 via the packing section 12 between the front and rear frames 1a and 1c. Have been. The unloading section 13 includes a pair of support frames 25 parallel to each other, an unloading conveyer 26 rotatably supported between the pair of supporting frames 25, and a rotatable support frame 25 located on the side of the packaging section 12 of the conveyor 26. , A plurality of unloading rollers 27, a motor 28 for rotating the unloading conveyor 26 and each unloading roller 27, and an electric heater 29.

As shown in FIGS. 3 and 4, the unloading conveyor 26 has a drive roller 26a installed at an intermediate position of the support frame 25 and an end of the support frame 25 furthest from the packaging section 12. An output shaft 28a of a motor 28 is connected to the driven roller 26b and an endless conveyer belt 26c made of a heat-resistant material and stretched over both rollers 26a, 26b. The output shaft 28a and each of the unloading rollers 27 are connected via a chain transmission mechanism 30, respectively. Therefore, the belt-type carry-out conveyor 26 and each carry-out roller 27 are driven synchronously. Unloading section 13
Is disposed such that the discharge roller 27 is positioned inside the tray packaging device 1 and the horizontal belt type discharge conveyor 26 projects outside the tray packaging device 1.

A stepping motor is used as the motor 28. The stepper motor is used to move the packed tray 17a to the unloading conveyor 2.
When the sheet 6 is conveyed to the central portion or to the discharge end side thereof, the operation is temporarily interrupted due to the heating and bonding described later, and the operation is resumed after a certain period of time.

The electric heater 29 is composed of a flat radiator plate and a heater wire which is embedded in a meandering shape inside the radiator plate and generates a resistance, and the inner side of the carry-out conveyor belt 26c, that is, between the driving roller 26a and the driven roller 26b. It is located between them. The electric heater 29 is temperature-controlled so that the predetermined temperature is maintained regardless of the operation state while the power of the tray packaging apparatus 1 is turned on, thereby releasing heat. Then, the upper belt portion of the carry-out conveyor belt 26c is heated to a high temperature of about 130 ° C. As a result, while the packaged tray 17a, which is automatically packaged and delivered to the unloading unit 13 via the unloading roller 27, is placed on the unloading conveyor belt 26c, the film F wrapping the tray 17 is electrically operated. Heated by the heater 29, the film portion folded into the outer surface of the bottom of the tray 17 is adhered, so that an appropriate packaging state is maintained.

As shown in FIGS. 1 and 2, a door 6 for opening and closing the tray carrying-in port 1b is attached to the tray carrying-in port 1b for dust prevention and safety. The door 6 has a pivot 7 whose upper end is rotated by the power of a stepping motor (not shown).
It is supported by. Then, the door 6 is turned by the power of a stepping motor driven by turning on the supply switch 36 from the hanging posture shown by the solid line in FIG. 2 to the rear frame 1c side shown by the two-dot chain line. Then, the tray entrance 1b is opened, and after maintaining this open state for a certain period of time, it is closed.

For example, the door 6 in the closed state is
The sensor arrays 31 and 32 for detecting the tray 17 to be carried in and located near the rear side are provided.

The horizontal sensor array 31 is used as a detecting means for detecting the width and depth of the tray 17 from below the tray 17 and detecting the number of trays to be packed. The sensor array 31 includes a plurality of reflective sensors 31a (only one is shown) in which a light emitting element made of a light emitting diode and a light receiving element made of a phototransistor are paired.
Are formed side by side at predetermined intervals in the width direction, and are arranged so as to pass through the inside of the carry-in belt conveyor 16 and cross the carry-in portion 11 in the width direction. Each sensor 31a is
The tray 17 is exposed between the belts 16a of the carry-in belt conveyor 16 and is not interrupted by the belts 16a.
To be able to face the bottom surface. The vertical sensor array 32 serving as a transmission type sensor detects the height of the tray 17 (including the protruding height when the internal article A protrudes from the opening of the tray 17). Although only one of them is shown in FIG. 2, it is provided vertically at both ends in the width direction of the carry-in portion 11. On one vertical sensor array, a plurality of light emitting elements 32a made of light emitting diodes are provided at regular intervals in the vertical direction. The other vertical sensor array (not shown) facing the vertical sensor array 32 is provided with a plurality of phototransistor light receiving elements for receiving light emitted horizontally from the light emitting elements 32a at regular intervals in the vertical direction. ing.

In FIG. 7, reference numeral 71 denotes control means, which comprises a control unit 72 comprising a CPU and the like, and a storage unit 73 having a ROM and a RAM. The control unit 72 and the storage unit 73 are connected via a bidirectional bus. The control means 71 controls the operations of the carry-in unit 11, the wrapping unit 12, the carry-out unit 13, the film supply unit 14, the operation panel 2 and the like connected to the control unit 71 so as to control the entire tray wrapping apparatus 1. ing. The control section 72 is connected to a vertical sensor array 32 and various sensors (not shown) together with a horizontal sensor array 31 as a detecting means via a bidirectional bus, and the display section 4 is connected via a bidirectional bus. Have been.

In the ROM of the storage unit 73, a control program for the overall operation of the tray packaging apparatus 1 executed via the control unit 72 is stored, and the control program for the unloading operation of the unloading unit 13 is stored therein. And this program is shown in FIG.

A program for the unloading operation will be described below.

This program is started when the power of the tray packaging apparatus 1 is turned on. In the first step 81, a process for setting a value n to a timer for the carry-out section is executed. The timer is formed by a timer circuit included in the control unit 72, and the n value is an interval time for rotating the unloading conveyor belt 26c at predetermined intervals during standby of the unloading unit 13, and this time is predetermined. Or arbitrarily determined by a setting operation on the operation panel 2. The interval time is such that the temperature of the belt portion wrapped around the lower side of the electric heater 29 does not decrease to the same level as the ambient temperature atmosphere before the next interval starts, and a certain high temperature higher than the ambient temperature is obtained. It is preferable to set the time so that it is retained.

In the next step 82, it is determined whether or not the tray 17 containing the article A is supplied onto the carry-in section 11 and the supply switch 36 is pressed and turned on via the tray 17. If this determination is YES, the process proceeds to step 83, where the tray packaging apparatus 1 executes the automatic packaging operation as described above. Then, after the wrapping operation is performed, the process returns to step 81 again to reset the n value.

If there is no supply of the tray 17 to be packed, the judgment in the step 82 is NO. In other words, the control means 71 determines that the tray packaging apparatus 1 is in a state in which the packaging operation is possible and is not performing the packaging operation, that is, in a standby state. Step 84 is performed.

In step 84, an arithmetic process of subtracting a numerical value 1 from the n value stored in the ROM (n = n
Perform -1) to change the set value of the timer. Then, in the next step 85, it is determined whether or not the changed n value is n = 0. If this determination is NO, in other words, if it is determined that the standby time after setting the n value has not reached the interval time, the process returns to step 82 to determine whether the tray 17 has been supplied. I do.

The routine of steps 82, 84 and 85 is as follows.
As long as the tray 17 is not supplied, that is, as long as the unloading section 13 is in the standby state, the operation is periodically repeated. Accordingly, the determination in step 85 becomes YES when the control unit 71 determines that the standby time after setting the n value has reached the predetermined time determined by the n value. is there. Then, the next step 86 is executed. In this step 86, a process for rotating the carry-out conveyor belt 26c by a predetermined rotation angle is performed by controlling the drive pulse for the motor 28 of the carry-out section 13 composed of the stepping motor via the motor driver. The rotation angle given to the carry-out conveyor belt 26c by this process is a rotation angle deviated from the rotation angle of N times 1 (where N is a natural number) in accordance with the number of application of the drive pulse, and is an odd multiple of half a rotation. Is desirable for the reasons described below.

After executing step 86,
The program returns to the first step 81.

Therefore, the electric heater 29 of the unloading section 13 continues to generate heat not only during the transport operation of the packed tray 17 in the unloading section 13 but also during the standby time before the unloading operation is started. When the unloading section 13 is on standby, the unloading operation program of FIG. 8 sets the timer to an n value, and then, every time an interval time corresponding to the n value elapses, rotates the unloading conveyor belt 26c. .

As described above, the carry-out conveyor belt 26c is
Even when the carry-out unit 13 is in a standby state, the stationary state is not maintained for the interval time or more, and 1 N
Since the rotation is performed at a rotation angle other than the rotation angle of N (where N is a natural number), the relative position of the discharge conveyor belt 26c with respect to the electric heater 29 is changed every predetermined time, and the discharge conveyor is continuously operated during the standby state. The upper belt portion of the belt 26c does not stand still and is not continuously heated to a high temperature of about 130 ° C. Therefore, the same belt portion of the carry-out conveyor belt 26c is prevented from being deteriorated by the heat given thereto, so that the conveyor belt 2c
6c can be improved in durability.

Furthermore, the intermittent rotation of the unloading conveyor belt 26c during the standby of the unloading section 13 as described above,
Even if the wrapped tray 17 and other articles are mistakenly left on the unloading conveyor belt 26c, the unloading operation is performed by the rotation of the conveyor belt 26c. Can be carried out. This prevents the articles that have been erroneously placed and left on the carry-out conveyor belt 26c from being exposed to high temperatures during the standby period and being adversely affected by heat, thereby preventing unexpected situations. be able to.

Furthermore, in the first embodiment in which the intermittent rotation of the discharge conveyor belt 26c is an odd multiple of half a rotation, the rotation causes the upper belt portion positioned above the electric heater 29 to be positioned below the electric heater 29. There is no place where the removed lower belt portion is completely turned upside down and is continuously exposed to high temperature, so that it is excellent in that the durability of the carry-out conveyor belt 26c can be further improved.

Incidentally, the upper belt portion heated by the electric heater 29 is moved while maintaining the relative position with the packaged tray 17 to be unloaded along with the unloading operation of the unloading conveyor belt 26c. Is carried out by moving the belt portion that had been below the electric heater 29 to the upper portion of the electric heater 29. Therefore, due to the exchange of the upper and lower belt portions during the standby period as described above, the temperature of the belt portion that goes around the lower side of the electric heater 29 gradually decreases as heat is radiated to the surroundings. However, in the present embodiment, the wrapping operation in step 83 is executed in a state where the wrapping is performed to a certain extent, so that the wrapping is performed via the cooled belt that is located below the electric heater 29 and turns upward. Heat bonding of the film F folded into the bottom outer surface of the finished tray 17 is not performed. In other words, the belt portion that directly carries the packaged tray 17 and heat-bonds the film has a certain degree of temperature in advance, so that the temperature rises when the portion reaches above the electric heater 29. It is excellent in that the film F folded into the bottom outer surface of the tray 17 can be heated and adhered quickly and reliably in a short time.

Further, during the waiting period, the belt portion which has been exposed to high temperature and has been heated to the high temperature goes down, so that the belt portion passes near the lower side of the carry-out portion 13 and the film guide mechanism. 21 is brought close to the film F. Therefore, the temperature of the film F guided to the film guide mechanism 21 by the heat radiation from the high-temperature belt portion wrapped around the lower side can be increased, which is advantageous in that the stretchability can be enhanced.

The present invention can also be applied to a packaging apparatus for automatically packaging objects to be packaged other than trays.

[0044]

The present invention is embodied in the form described above and has the following effects.

According to the first aspect of the present invention, the carry-out conveyor belt is kept stationary during the standby period of the carry-out section, and the upper belt portion of the conveyor belt is heated by the electric heater installed inside the carry-out conveyor belt. Since we will not continue,
Deterioration of the carry-out conveyor belt can be prevented, and its durability can be improved. At the same time, even if an article is erroneously placed on the conveyor belt and left unattended, the carry-out operation is performed by the regular rotation, so that the thermal adverse effect on the article erroneously placed on the belt is reduced. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of an entire tray packaging apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a configuration of a carry-in section of the tray packaging device according to the first embodiment.

FIG. 3 is a plan view showing a positional relationship among a carry-in unit, a packing unit, and a carry-out unit of the tray packaging device according to the first embodiment.

FIG. 4 is a cross-sectional view showing a positional relationship between a carry-out unit and a film supply unit shown along the line ZZ in FIG. 3;

FIG. 5 is a sectional view showing a configuration of a packaging unit of the tray packaging device according to the first embodiment.

FIG. 6 is a plan view showing a state in which the film is stretched in the packaging section of the tray packaging apparatus according to the first embodiment.

FIG. 7 is a block diagram showing an electrical configuration of the tray packaging device according to the first embodiment.

FIG. 8 is a flowchart showing the operation of the unloading section of the tray packaging device according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tray packaging apparatus (packing apparatus), 11 ... Carry-in part, 12 ... Packaging part, 13 ... Carry-out part, 14 ... Film supply part, F ... Film, 17 ... Tray (object to be packaged), 26 ... Carry-out conveyor, 26c ... Conveyance conveyor belt, 28 ... Motor, 29 ... Electric heater, 71 ... Control means, 72 ... Control unit, 73 ... Storage unit.

Claims (1)

[Claims] 1. A film supply section, a packaging section for folding the film fed from the supply section into an outer surface of a bottom portion of the article to be packaged, and packaging the article to be packaged, and a packaged article delivered from the packaging section. An unloading section for unloading the article, the unloading section having an unloading conveyor belt, and an electric heater disposed inside the conveyor belt to continuously generate heat even during standby and heat the unloading conveyor belt. In the automatic packaging apparatus for heating and bonding the overlapping films folded on the bottom outer surface by the carrying-out conveyor belt heated by the heater and carrying out the packaged object, An automatic wrapper wherein the conveyor belt is rotated at a rotation angle other than a rotation angle of N times (where N is a natural number) every predetermined time. Equipment.