JPH10167206A - Safety device of heat-seal in automatic packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust a sensor and securely fix a safety device and prevent it from bringing an adjustment deviation during use. SOLUTION: A photoelectric sensor 35 is fixed to a movable frame 13 and a light-emitting part and a light-receiving part are oppositely arranged in a vertically extending slit 36 provided in the photoelectric sensor 36 and a bracket is fixed to a fixed frame 12. A light shielding plate 43 which is guided by the guide hole of the bracket and the guide hole of the movable frame 13 and always urged downward by a spring, is provided. The light shielding plate 43 is arranged so as to be vertically movable in the slit 36 of the photoelectric sensor 36 and an opening is formed at a position where the light of the photoelectric sensor can be usually transmitted. A stopper fitting to the bracket and prohibiting the downward movement of the light shielding plate 43 urged by the spring, is provided at the shielding plate 43 and the lower end of the light shielding plate 43 is arranged in a position where it comes into contact with the lower contact body almost simultaneously with the time when a pressing plate contacts the roller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sealing safety device in an automatic packaging machine for automatically heat-sealing an opening after packing various articles in a synthetic resin bag.

[0002]

2. Description of the Related Art At a cleaning shop, for example, clothes after cleaning are packed in an endless cylindrical body made of polyethylene as a service for preventing contamination, and the end of the cylindrical body is heat-sealed and delivered to a customer. I have. The work of packing clothes in such polyethylene bags is generally carried out by many laundry shops, which are very small shops or companies, so it is uneconomical to perform fully automatic bag packing with a large packaging machine. There is a need for a small and inexpensive packaging machine. At a minimum, a machine for manually putting clothes in a polyethylene bag and then heat sealing the opening is required.

[0003] Therefore, it is difficult to heat-seal the opening of the polyethylene bag along the heat-sealing device, and it is difficult to heat seal the opening of the polyethylene bag. A non-cylindrical sheet is manufactured, and this sheet is layered on the outer periphery of a cylindrical guide arranged in the vicinity of the heat sealing portion while maintaining the cylindrical shape. After making the bottom of the cylindrical guide, insert the clothes to be wrapped in the guide from the opening side of the cylindrical guide, and push the above one end into the closed cylindrical sheet, corresponding to the length of the inserted clothes. Pull out the cylindrical sheet layered on the outer periphery of the guide, pull it out until the heat seal portion is located at an appropriate bag closing position, and cut this portion while heat sealing this portion. It is way. Thereafter, similarly, insert the next piece of clothing from the opening side of the cylindrical guide, insert the piece of clothing into the portion having the bag closed portion as the bottom, pull out the cylindrical sheet to a predetermined length, and remove this portion. Cut while heat sealing.

As described above, the conventional heat sealing device is
A somewhat automated machine is used in which clothes are inserted into a cylindrical sheet while the clothes are inserted into a guide by a human hand, the cylindrical sheet is pulled out, and a predetermined position is heat-sealed. The heat seal part of this machine is provided with a lower roller arranged in the width direction of the cylindrical sheet, and a heat seal member movably up and down above the roller, and the heat seal member is electrically driven through two rods. It is moved up and down by the device.

[0005] In use, a wrapped object into which a garment is inserted in a cylindrical sheet is passed between the roller and the heat seal member in a state where the heat seal member is positioned upward, and the bag is moved to a predetermined bag closing position. When the electric device is operated, the heat sealing member is moved downward via the rod, and the heating element heated to about 200 degrees in the width direction provided at the lower end of the heat sealing member is heated sufficiently to about 200 degrees to the roller side. The crushed two sides of the cylindrical sheet made of polyethylene between the roller and the heating element are welded, cut and welded, and the bag is closed. In order to ensure the operation of the heating element at this time, a holding plate that is constantly urged downward by a spring and that normally projects downward from the tip of the heating element is provided on both sides of the heating element, During the downward movement, the pressing plate was placed on the cylindrical sheet before the heating element was pressed against the cylindrical sheet on the roller, and continued to press and hold the opening of the cylindrical sheet, and then pressed. The heating element heat seals and cuts the cylindrical sheet.

[0006] In the operation of closing the bag in this heat sealing apparatus, there is an operation by a person. In particular, in the operation of pulling out the cylindrical sheet containing the clothes to a predetermined position, a human hand closes the portion to close the bag. In many cases, if a finger or the like exists directly below the heat-sealing member where the heating member descends, when the heat-sealing member descends as described above, the heating member pinches the finger between the roller and the There is also a danger of injuring your fingers as well as Conventionally, as a countermeasure, a photoelectric sensor consisting of a light-emitting part and a light-receiving part is provided on roller receivers provided at both ends of the roller, and when a foreign object such as a finger or a hand exists in this part, the light-receiving part of the photoelectric sensor Does not arrive, the presence thereof is detected, and in that case, the danger as described above is prevented by stopping the electric device for lowering the heat seal member.

[0007]

In the above-mentioned conventional apparatus, photoelectric sensors for detecting the presence of foreign matter on the upper portion of the roller are provided at both ends of the roller. The distance had to be large and therefore usually had to be about 50 cm apart. Therefore, the distance between the light emitting unit and the light receiving unit of the photoelectric sensor is large, and it is difficult to adjust the light emission axis of the light emitting unit to coincide with the light receiving axis of the light receiving unit. If this axis does not match, the photoelectric sensor will not operate. Also, even after adjustment and installation, its axis gradually shifts due to vibrations during use, etc.When it completely shifts, it will not function as a safety device, and it will be used with confidence in the existence of the safety device. May cause unexpected injury.

When the tubular sheet is transparent, even if the tubular sheet is present between the light-emitting portion and the light-receiving portion, there is no problem since light is transmitted in a normal case, but this tubular sheet is not problematic. If is colored, or if the tubular sheet is jammed causing wrinkles due to transport trouble etc. even if it is transparent, light does not pass through the tubular sheet, and the photoelectric sensor has a foreign substance. Nevertheless, there were cases where the heat sealing operation could not be performed due to erroneous detection.

Further, in the conventional apparatus, when the photoelectric sensor detects that a foreign substance is present in the heat seal portion, only the motor for lowering the heat seal device is stopped. Position
When the heat sealing device is already in a state where a finger or hand is caught, the finger or hand is caught and cannot be pulled out, and the finger or hand is heated for a long time by a heating body, and there is a danger of causing fatal burns. Was.

Accordingly, the present invention provides a heat sealing device provided with a safety device for preventing a hand or the like from coming into contact with a heating element of the heat sealing device, in which a sensor for detecting the presence of a hand or the like is adjusted. Automatic that can be easily performed, can be securely attached, does not cause misalignment during use, and can operate even when using a colored tubular sheet and jamming the tubular sheet. An object of the present invention is to provide a heat sealing device in a packaging machine.

[0011]

According to the present invention, in order to solve the above-mentioned problems, a heat seal member is provided to be movable up and down with respect to a lower roller by a driving device, and a heating element is fixed to a fixed frame fixed to the heat seal member. The fixed frame is provided with a movable frame that is constantly urged downward and can move up and down, and the movable frame is provided with a pressing plate arranged on the side surface of the heating body so as to normally project below the heating body, In a heat sealing device in an automatic packaging machine in which a heating plate comes into contact with a press plate after a pressing plate comes into contact with a cylindrical sheet on a roller when a heat sealing member descends, a photoelectric sensor is fixed to a movable frame and provided on the photoelectric sensor. The light emitting part and the light receiving part are arranged opposite to each other in the slit extending in the vertical direction, and the bracket is fixed to the fixed frame. A light-shielding plate guided by the guide hole and constantly biased downward by a spring is provided, and the light-shielding plate is arranged in the slit of the photoelectric sensor so as to be movable up and down, and normally transmits light of the photoelectric sensor. An opening is formed at a position where the light-shielding plate is provided, and a stopper is provided on the light-shielding plate to stop the downward movement of the light-shielding plate which is engaged with the bracket and is urged by a spring. As a result, the safety device of the heat seal in the automatic packaging machine is configured by being arranged at a position where it comes into contact with the lower contact body at substantially the same time.

According to the present invention, as described above, when the object to be packaged is inserted into the cylindrical sheet and its end is positioned on the roller, when the heat sealing member is lowered by the driving device, The plate presses the cylindrical sheet, and at this time, the lower end of the light shielding plate abuts on the lower contact body almost simultaneously, and the light shielding plate moves and stops together with the photoelectric sensor fixed to the movable frame to which the pressing plate is fixed. The light from the light-emitting portion of the photoelectric sensor passed through the opening of the light-shielding plate and reached the light-receiving portion without shifting the positional relationship between the two, and the heat-sealing member was moved downward by the driving device as it was and held down by the pressing plate. The heating element is pressed against the cylindrical sheet and heated to fuse the cylindrical opening and cut this part. Thereafter, the heat sealing member is raised by the driving device and returns to the original position.

On the other hand, when foreign matter such as a finger or a hand is present between the roller and the roller while the heat sealing member is being lowered, the pressing plate cannot be lowered by the foreign material before the lower end of the light shielding plate comes into contact with the contacting body. The holding plate rises relative to the fixed frame. As a result, the light-shielding plate descends together with the fixed frame while the stopper portion is locked to the bracket of the fixed frame, and the photoelectric sensor is fixed to the movable frame to which the holding plate is fixed. The light from the light-emitting portion of the photoelectric sensor is blocked by the light-shielding plate, and the signal is sent to the driving device of the heat sealing member, the driving device is stopped, and then inverted and raised as necessary. Operate.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings based on an example in which clothes are wrapped in polyethylene bags in a cleaning shop. FIG. 1 shows an outline of the configuration of a heat sealing device in a conventionally used automatic packaging machine to which the present invention is applied. A roller 4 is rotatably provided between the supply section 2 and the package body placement section 3, and its upper surface slightly projects. A hollow cylindrical guide 5 is fixed above and in front of the supply unit 2, and a long polyethylene cylindrical sheet 6 is externally inserted on the outer periphery thereof. I have. Two left and right movable rods 10 protrude from the inside of the main body 1 near the rollers, and a heat seal member 11 is fixed to an upper end of the movable rod 10.

The heat seal member 11 includes a fixed frame 12 fixed to the movable rod 10 and a movable frame 13 movably supported by the fixed plate, as described later.
The heating element is fixed to the fixed frame 12, and the pressing plate is fixed to the movable frame 13. The movable frame 13 is constantly urged downward by a spring to the fixed frame 12 as described later, and the holding plate of the movable frame is located on the side surface of the heating body and is arranged to protrude below the heating body. .

In the heat sealing apparatus having the above-described structure, one end of the cylindrical sheet 6 is first pulled out from the cylindrical guide 5 and the end is placed on the roller 4. The heat sealing member 11 is lowered via the rod 10 by the motor provided in the above, and the cylindrical sheet 6 is welded by the heating body while the cylindrical sheet 6 is pressed by the pressing plate to form the bottom of the first bag. Thereafter, clothes to be wrapped in the cylindrical guide 5 are inserted from the opening 8 side of the cylindrical guide 5 into the cylindrical guide 5, and the clothes are pushed into the cylindrical sheet 6 having one end closed, and the length of the garment inserted is set. After pulling out the cylindrical sheet 6 layered on the outer periphery of the cylindrical guide 5 until the roller 4 is positioned at an appropriate bag closing position, the motor is driven again and the heat sealing member 11 is Then, the cylindrical sheet is welded by the heating element while the cylindrical sheet 6 is pressed by the pressing plate, the opening of the first bag is closed and cut, and the package is taken out from the package placing section 3. Thereafter, similarly, insert the next piece of clothing from the opening side of the cylindrical guide, insert the piece of clothing into the portion having the bag closed portion as the bottom, pull out the cylindrical sheet to a predetermined length, and remove this portion. Cut while heat sealing.

In the operation of closing the bag in this heat sealing apparatus, there is an operation by a person. In particular, in the operation of pulling out the cylindrical sheet containing the clothes to a predetermined position, a human hand closes the portion to close the bag. In many cases, if a finger or the like exists directly below the heating body of the heat-sealing member that descends, when the heat-sealing member descends as described above, the heating body sandwiches the finger between the roller and the burn. There is also a danger of injuring your fingers as well as As a countermeasure, in the present invention, a safety device as shown in FIGS. 2 and 3 is provided. Hereinafter, the safety device portion of the heat sealing device in the automatic packaging machine of the present invention will be described with reference to FIG.

FIG. 2 is a perspective view showing a state in which parts of the safety device 12 are partially exploded, and FIG. 3 is a perspective view showing a state in which these parts are assembled. The safety device 15 is provided symmetrically on both sides of the heat seal member 11, and only one side is shown in each figure. A poly pressing guide 17 is fixed to the end wall 15 of the fixed frame 12 by screws. The poly pressing guide 17 includes a fixed wall 18, an upper guide 20, and a lower guide 21, and the upper guide 20 has a rod guide hole 22. And the first detection plate guide hole 23, and the lower guide 21 is provided with a U-shaped guide groove 24. Further, the fixed wall 18 is provided with a shaft hole 25 of a swing stopper shaft described later. A heating body 26 protrudes from the lower surface of the fixed frame 12.

A guide rod 27 is fixed to the side of the upper surface of the movable frame 13, and an L-shaped bracket 30 is fixed to an end of the side wall 28 by screws. On the side, a heat-insulating sensor mounting plate 31 made of synthetic resin such as epoxy resin mixed with glass fiber.
Are fixed, and the locking portion 32 protrudes. The locking portion 32 is formed with an opening 33 formed in the sensor mounting plate 31.
From the sensor mounting plate 31. The sensor mounting plate 31 has a photoelectric sensor mounting screw hole 34 in which the photoelectric sensor 35 is mounted by screws.
The photoelectric sensor 35 has a slit 36 that opens vertically with respect to the front surface, and a light-emitting portion and a light-receiving portion are provided on an arm 37 that faces through the slit 36. The light receiving unit senses the light from the sensor and outputs a predetermined signal.

The movable frame 13 has a second detection plate guide hole 38 formed therein. The first detection plate guide hole 23 and the second detection plate guide hole 38 have a guide plate portion extending vertically in the detection plate 40. 41
Are inserted and guided. Detection plate 4
0, an arm 42 protruding from the guide plate portion 41
A light-shielding plate 43 extending upward from the light-shielding plate 43. The light-shielding plate 43 is vertically movably arranged in the slit 36 of the photoelectric sensor 35, and forms a locking portion 44 at the upper end of the light-shielding plate 43.
The locking portion 44 is the upper guide 2 of the poly press guide 17.
When locked at 0, a through hole 45 is formed at a position where the light emitting unit and the light receiving unit provided on the arm 37 of the photoelectric sensor face each other. A stopper screw 46 is provided at a lower end of the light shielding plate 43, and the stopper screw 46 can be locked to the locking portion 32 of the L-shaped bracket. When the detection plate 40 is assembled, a spring 4
The spring 47 is contracted between the arm 42 and the upper guide 20 and urges the detection plate 40 so as to be separated downward from the fixed frame 12.
As a result, the detection plate 40 normally operates as a light shielding plate 43.
Is locked to the upper guide 20, and the light-transmitting hole 45 does not block the light of the photoelectric sensor 35, so that the photoelectric sensor 35 normally outputs a predetermined signal.

In these assembled states, the lower end 48 of the guide plate 41 of the detection plate 40 is
3, a lower end 48 is provided on a roller bearing when the movable frame 13 sandwiches the cylindrical sheet between the movable frame 13 and the roller during normal operation of the heat sealing device. , The relative position with respect to the detection plate stopper 50 is adjusted. Guide rod 2 provided on movable frame 13
7 is a rod guide hole 22 and a guide groove 24 of the poly pressing guide 17 provided on the fixed frame 12 in the assembled state.
And the spring 5 provided on the guide rod 27
1 is provided in a contracted manner between the upper surface of the movable frame 13 and the lower guide 21, and constantly biases the movable frame 13 downward with respect to the fixed frame 12. Guide rod 27
A notch groove 52 is formed in the side surface of the upper end of the shaft.
Swing stopper 54 that swings around a shaft 53 that is fixed to the shaft
Of the swing stopper 54 is engaged.
Is constantly urged upward by a torsion spring 56 provided on the shaft 53.

During operation of the heat sealing device provided with the safety device 15 having the above-described configuration, in a standby state in which the heat sealing member 11 is positioned above the movable rod 10 by the driving device, the spring 51 secures the fixed frame. The movable body 13 is separated from the movable frame 13, and the heating element 26 is located above the opening 58 of the pressing plate 57 of the movable frame 13, and this state is shown in FIG. At this time, the lower end 48 of the guide plate of the detection plate has a height H.
It protrudes by a predetermined amount of 1.

From this state, the cylindrical sheet 6 is placed on the roller 4.
Is inserted and stopped at a predetermined position, the drive device is operated to lower the entire heat seal member 11 via the movable rod 10. Thereby, the pressing plate 57 portion of the movable frame 13 first comes into contact with the cylindrical sheet surface, and presses the cylindrical sheet 6 between the movable sheet 13 and the roller 4. Further, the heat sealing member 11
When the whole body descends, the fixed frame 12 descends against the spring 51, and the heating body 26 is brought into contact with the cylindrical sheet surface through the opening 58 provided in the holding plate 57 to melt this part. The upper sheet and the lower sheet of the sheet-like sheet 6 are welded, and the central part thereof is strongly pressed against a roller to be melt-cut.

At this time, the lower end 48 of the detecting plate 40 is fixed to the movable frame 13 having the detecting plate 40 and the pressing plate 57 because the pressing plate 57 presses the cylindrical sheet 6 and simultaneously contacts the detecting plate stopper 50. The light from the light emitting portion of the photoelectric sensor 35 is received by the light receiving portion through the through hole 45 of the light shielding plate 43 without changing the relative position with respect to the photoelectric sensor 35.
5 outputs a predetermined output. Thereafter, the heat seal member 11 is raised via the movable rod by the reversing operation of the driving device, and returns to the original standby position.

On the other hand, when a finger or a hand is caught between the movable frame 13 and the roller 4 when the heat sealing device is lowered, the detection plate 40 is moved downward by the spring 47 without the movable frame 13 being lowered. Since it is urged and descends with the fixed frame, the relative position of the photoelectric sensor 35 fixed to the movable frame 13 with respect to the detection plate 40 changes. As a result, the light-shielding plate 43 descends in the relative positional relationship between the light-shielding plate 43 and the photoelectric sensor 35, and the
5 falls in the slit 36 of the photoelectric sensor 35, and the light-shielding plate 43 is present between the light-emitting part and the light-receiving part of the photoelectric sensor 35, so that the photoelectric sensor 35 does not output a predetermined output,
The operation of the driving device is stopped by detecting this signal. This state is shown in FIG. 6, the lower end of the detection plate 40 is projected by H ₂ from the lower end surface of the movable frame 13, which is larger than the usual amount of projection H _1. The drive device then reverses to raise the heat seal member 11 so that the fingers or hands that are pinched can be removed.

[0026]

The present invention is configured as described above.
In a heat sealing device provided with a safety device that prevents a hand or the like from contacting a heating body of the heat sealing device, adjustment of a sensor that detects the presence of a hand or the like can be easily performed, and It can be securely attached, does not cause an adjustment deviation during use, and can be reliably operated even when using a colored tubular sheet and jamming the tubular sheet.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall outline of a heat sealing device to which the present invention is applied.

FIG. 2 is a partially exploded perspective view of the embodiment of the present invention.

FIG. 3 is a perspective view of the assembled state.

FIG. 4 is a partial side view showing a standby state of the heat seal member of the embodiment.

FIG. 5 is a partial side view showing the heat sealing operation state.

FIG. 6 is a partial side view showing a state where the same finger or the like is sandwiched.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat sealing apparatus main body 2 Supply part 3 Package mounting part 4 Roller 5 Cylindrical guide 6 Cylindrical sheet 7 Front end 8 Opening 10 Movable rod 11 Heat sealing member 12 Fixed frame 13 Movable frame 15 Safety device 16 End wall 17 Poly Holding guide 18 Fixed wall 20 Upper guide 21 Lower guide 22 Rod guide hole 23 First detection plate guide hole 24 Guide groove 25 Shaft hole 27 Guide rod 28 Side wall 30 L-shaped bracket 31 Sensor mounting plate 32 Locking portion 33 Opening 34 photoelectric sensor mounting screw hole 35 photoelectric sensor 36 slit 37 arm 38 second detection plate guide hole 40 detection plate 41 guide plate portion 42 arm 43 light shielding plate 44 locking portion 45 through hole 46 stopper screw 47 spring 48 lower end of guide plate 5 Detection plate stopper 51 spring 52 cutout groove 53 shaft 54 swings the stopper 55 locking end portion 56 a torsion spring 57 pressing plate 58 opening

Claims (3)

[Claims] A heat seal member is provided to be movable up and down with respect to a lower roller by a driving device, a heating body is provided on a fixed frame fixed to the heat seal member, and the fixed frame is constantly urged downward to move vertically. A movable frame is provided, and the movable frame is provided with a pressing plate disposed on the side of the heating body so as to normally protrude below the heating body, and a pressing plate is provided on the cylindrical sheet on the roller when the heat sealing member is lowered. In a heat sealing device in an automatic packaging machine in which a heating element comes into contact after contact, a photoelectric sensor is fixed to a movable frame, and a light emitting unit and a light receiving unit face a vertically extending slit provided in the photoelectric sensor. The bracket is fixed to the fixed frame, and guided by the guide hole of the bracket and the guide hole of the movable frame, and is constantly urged downward by a spring. A safety device for heat sealing in an automatic packaging machine, comprising a light shielding plate to be provided. 2. A light-shielding plate is disposed in a slit of a photoelectric sensor so as to be movable up and down, and an opening is formed at a position where light of the photoelectric sensor is normally transmitted. The light-shielding plate is engaged with a bracket and urged by a spring. 2. A stopper portion for stopping the downward movement of the light shielding plate, wherein the lower end of the light shielding plate is disposed at a position where the lower end of the light shielding plate comes into contact with the lower contact body almost at the same time as the pressing plate comes into contact with the roller. Safety device for heat sealing in automatic packaging machines. 3. The safety device for heat sealing in an automatic packaging machine according to claim 1, wherein the driving device stops driving in response to a light blocking signal from a photoelectric sensor and reverses and raises the heat sealing member.