JPS6325937B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface treatment apparatus for synthetic resin molded articles, and more particularly to an apparatus for melt-pressing a sheet-like synthetic polymer material onto the surface of a synthetic resin molded article.

Synthetic resin molded products have excellent properties and can be used for boxes, bottles,
It is already well known that synthetic resin molded products are widely used as pallets and the like, and that synthetic resin molded products have a major drawback of being slippery.

In order to prevent slippage in such synthetic resin molded products, a technique is developed in which a non-slip material made of a sheet-like synthetic polymer material is firmly installed on the surface of the synthetic resin molded product by hot air welding using a hot air welding machine. Also Patent Application No. 123477 of 1972 (Patent Application No. 1972)
No. 38645).

However, the conventional surface treatment apparatus for synthetic resin molded products disclosed in the above-mentioned publication supplies a very long sheet of synthetic polymer material wound on a reel to a feeding guide and cuts it as appropriate. It was designed to be fused to a synthetic resin molded product. Therefore, when simultaneously welding multiple sheet-like synthetic polymer materials onto the surface of a synthetic resin molded product transferred by a conveyor device, it is necessary to prepare the necessary number of reels, which also requires equipment. There was a problem. Furthermore, as a matter of course, according to the conventional apparatus described above, when the sheet-like synthetic polymer material wound on one reel is used up, a new reel is required to re-supply the material. Since the replacement work was required, there was a problem in that the surface treatment work for the synthetic resin molded product had to be interrupted.

Therefore, an object of the present invention is to simultaneously fuse and lathe a plurality of sheets of synthetic polymer material simultaneously when fusing a sheet of synthetic polymer material to the surface of a synthetic resin molded product. An object of the present invention is to provide a surface treatment device for synthetic resin molded products.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The surface treatment apparatus for synthetic resin molded articles of the present invention will be described in more detail below with reference to preferred embodiments shown in the accompanying drawings. Note that this example shows an apparatus for fusing a sheet-like anti-slip material made of a synthetic polymer material to the surface of a pallet as an example of a synthetic resin molded product. The pallet and the sheet-like synthetic polymer material are simply referred to as the sheet-like anti-slip material.

In FIG. 1, a pallet surface treatment apparatus according to the present invention for welding a sheet-like anti-slip material to the surface of a pallet is generally designated by the reference numeral 10. This pallet surface treatment device 10 includes a conveyor device 12 that transports a pallet 11 in a fixed direction, a roller 14 that presses a sheet-like non-slip material 13 onto the pallet surface.
A hot air welding machine 15 that heats the pallet surface and the sheet-like non-slip material 13, and a sheet-like non-slip material 1
a feeding guide 16 for feeding 3 to the pallet surface;
It includes a magazine device 17 that holds a large number of sheet-shaped anti-slip materials 13 cut into predetermined lengths and supplies the anti-slip materials 13 in a timely manner.

As shown in FIG. 2, the conveyor device 12 for transporting the pallets 11 in a fixed direction includes a chain conveyor 18, and a suitable support member directly on or near the chain conveyor on one side of the chain conveyor in the transport direction. The free guide roller 19 includes a plurality of free guide rollers 19 installed in parallel in a straight line, and an endless drive belt device 20 disposed on the other side. This endless drive belt device 20 includes two pulleys 21 which are spaced apart from each other in the direction of conveyance of the pallet 11 being conveyed on the chain conveyor 18 and are arranged with their rotational axes perpendicular to each other, and the pulleys are attached to their support members. A biasing force is constantly applied to the pallet 11 by a spring 22 so as to press the side surface of the pallet 11.

As a result, the pallet 11 being transferred on the chain conveyor 18 is transported by the free guide roller 1.
9 and the endless drive belt device 20, the pallet can be prevented from meandering or slipping off during transportation, and the anti-slip material welding process described later can be performed accurately. Of course, the driving speed of the belt 23 of the endless drive belt device 20 is the same as that of the chain conveyor 18.
The speed is the same as that of The speed of this chain conveyor 18 depends on the size of the pallet, the melting temperature,
The width and thickness of the sheet-like non-slip material, the difficulty of melting the pallet and the non-slip material, the hot air temperature of the hot air welding machine and its capacity, etc. are taken into consideration and the setting is appropriately made.

The hot air welder 15 is commonly used and is supported and fixed above the conveyor device 12 by a suitable fixture 24. The hot air outlet 25 is provided on the feeding direction side of the pallet 11 and on the pressing roller 14 side so that both the upper surface of the pallet 11 and the non-slip material, which will be described later, can be heated with hot air near the pressing roller 14, which will be described later. It is supported at an appropriate inclination.

Further, a preheater 26 is disposed above the conveyor device 12 in front of the hot air outlet 25 in the pallet transport direction. This preheater 26 is installed before heating by the hot air welding machine 15 in order to compensate for insufficient heating of the pallet side by the hot air welding machine 15 (insufficient formation of a molten layer) which inevitably occurs when production speed is increased. It is preheated to . The installation of such a preheater 26 does not apply spot heating to the areas on the pallet surface where the anti-slip material is to be welded, but rather heats the area long in the pallet feeding direction so that the heating time per unit area is longer. Elongated ones are preferred. but,
Excessive heating that would change the shape of the pallet, which is a synthetic resin molded product, should not be done. Examples of the type of preheater 26 include conventional preheating means such as an electric heater, hot air, and a gas burner, but a far-infrared heater with good heating efficiency is particularly preferable.

A roller 14 that presses the anti-slip material against the surface of the pallet with an appropriate force is disposed close to and facing the hot air outlet 25 of the hot air welding machine 15. This pressing roller 14 is rotatably attached to an arm 27. This arm 27 is fixedly attached to a support 28, and the support 28 is pivotally connected to a guide support body 29 that supports a feed guide 16 for supplying anti-slip material, which will be described later.
A support arm 31 extending laterally is attached to the guide support body 29 above the pivoting portion 30 of the support 28 to the guide support body 29, and an open threaded portion formed at the tip of the support arm 31 A pressing force adjusting threaded rod 32 is screwed into the spring 52, and the lower end of the threaded rod is connected to a spring 52 attached to a protrusion 33 provided on the support 28.

By rotating the pressing force adjustment threaded rod 32, the length of the threaded rod 32 can be adjusted by inserting and removing it from the opening threaded portion of the support arm 31, thereby changing the strength of the spring 52. The support 28 is attached to the pivot portion 3
Since the structure is such that it can pivot about 0, the pressing force of the pressing roller 14 against the surface of the pallet 11 can be adjusted as a result.

However, the adjustment of the pressing force of the pressing roller 14 by rotating the pressing force adjustment screw rod 32 is performed in a minute range, and the macroscopic pressing force of the pressing roller 14 is adjusted by raising and lowering the guide support body 29. It is done. This vertical movement of the guide support body 29 is effected by a known suitable link mechanism 34 attached to the back side of the support body.

Further, since the pressure roller 14 presses and welds the anti-slip material 13, which is at least partially molten, to the surface of the pallet 11, the non-slip material 13 or the molten material on the surface of the pallet may be deposited on the surface of the pressure roller 14 at this time. For example, the surface of the pressure roller 14 should not be coated with a fluorine-based resin such as polytetrafluoroethylene, polyfluorinated ethylene propylene, polytrifluorochloroethylene, polyvinylidene difluoride, or polytetrafluoroethylene. It is preferable to carry out treatments such as coating or polishing the surface of the pressure roller to give it a mirror finish. Furthermore, it is desirable to provide a scraper 53 to scrape off any melted material that adheres to the pressure roller 14. The scraper 53 may have any structure as long as it scrapes off the molten material adhering to the pressure roller 14, and an example of such structure is shown in FIG.

Note that if the pressure roller 14 is excessively heated during welding of the anti-slip material 13, a cooling air blower 55 or the like may be provided to cool the pressure roller 14.

On the other hand, a feeding guide 16 for feeding the anti-slip material 13 made of a sheet-like synthetic polymer material between the pressure roller 14 and the surface of the pallet 11 is attached to the front part of the guide support body 29 and is supported. has been done. This feeding guide 16 contributes to feeding and arranging a long anti-slip material 13 supplied from a magazine device 17, which will be described later, between the upper surface of the pallet 11 and the pressing roller 14. The guide has a generally tubular shape extending in the vertical direction.

The vicinity of the opening at the lower end of this tubular feeding guide 16 is covered with the anti-slip material 1 that has been supplied inside the pipe.
3 is smoothly placed on the upper surface of the pallet 11 being transferred on the chain conveyor 18, and at the same time the non-slip material 13 is placed on the pressure roller 14.
It is curved in the direction of the pressing roller 14 in order to smoothly feed the roller. Further, the opening at the upper end is formed into a funnel shape in order to facilitate introduction of the tip of the elongated anti-slip material 13 supplied from the magazine device 17 into the feeding guide tube. In this way, forming the feeding guide 16 from a tube regulates the traveling path of the anti-slip material 13, thereby preventing lateral displacement and ensuring accurate positioning of the anti-slip material on the pallet. This is extremely preferable because it allows

However, the shape, especially the cross-sectional shape, of the feeding guide 16 is not limited to the tubular shape as in the embodiment, but is U-shaped to prevent the non-slip material 13 being fed from shifting in the lateral direction. etc. may be used.

Also, a position adjustment screw 54 is attached to this feeding guide 16.
etc. are provided at the lower end of the feeding guide 16 and the pressing roller 14.
It would be even more convenient if the distance between the two could be adjusted.

A pair of phototube detectors 35a and 35b are attached to the feed guide 16 near its upper end and slightly below the middle, respectively.
These respective phototube detectors 35a or 35b
consists of a light-emitting part and a light-receiving part that are attached opposite to the side wall of the tube of the feeding guide 16, and irradiates the light emitted from the light-emitting part to the light-receiving part through an opening formed in the opposite side wall of the tube. The system detects the feeding by blocking the light by the anti-slip material fed inside the pipe.

Furthermore, this feeding guide 16 is provided with a stopper 36 for temporarily stopping the feeding of the anti-slip material 13 fed into the pipe of the guide. This stopper 36 includes a protrusion 37a that protrudes into the interior from an opening formed in the side wall of the feed guide tube, and a rod 37 that supports the protrusion so that it can enter and exit from the opening of the feed guide tube.
b. Such a stopper 36 can be actuated by suitable means, such as a linkage actuable by an electromagnetic device or a motor capable of forward and reverse rotation. When this stopper 36 is actuated, the protrusion 37a transversely enters the interior of the feed guide tube through the side wall opening and feeds the non-slip material by pressing the non-slip material against the inner wall of the tube. Payment will be stopped.

At a suitable location in the horizontal plane slightly above the upper end of the feeding guide 16 is a magazine device 17 that stores a large number of sheet-shaped anti-slip materials 13 cut into predetermined lengths and supplies these sheets one by one in a timely manner. is located. This magazine device 17
As shown in the figure, it includes a non-slip material storage case 38 with an open bottom, and a predetermined length of sheet-like non-slip materials 13 are stacked and accommodated in the case.

2 at each longitudinal end of the case 38.
A pair of external caliper type arm devices 39, 40 are attached. The structure and operation of these arm devices 39 and 40 will be explained with reference to FIG. 3, which shows one end of the case 38.
9 consists of two arm members 41a and 41b,
Gears 42a and 42b that mesh with each other are fixedly attached to the upper ends of these arm members, and the shafts of the respective gears are supported by bearings at the upper part of the case 38. The lengths of the arm members 41a and 41b are such that their opposing tips 43a and 43b are in the closed position of the arm device 39 to prevent the sheet-like anti-slip material from falling from the opening 44 formed at the bottom of the case 38. The opening part 44 is set to be in a position where the opening part 44 is partially closed so as to support the lowermost non-slip member in the case 38.

The other arm device 40 also consists of two arm members 45a, 45b, and at the upper ends of the arm members are gears 46a, 46b that mesh with each other, the gear 46a being connected to the gear 42a, and the gear 46b being connected to the gear 42b. Gears that mesh with each other are attached, and the shafts of these gears 46a and 46b are supported by bearings on arbitrary members. This arm member 45
The length of a, 45b is the opposite tip 47
a and 47b are set to support the second non-slip material from the bottom when the arm device 40 is in the closed position.

By the way, these two pairs of arm devices 39, 40
is pre-adjusted and installed so that when the arm member of one arm device is open, the arm member of the other device is closed, and is then geared by a gear 48 connected to a suitable drive. 4
By rocking and rotating the gear 9, the gear 42a meshing with the gear 49 and the gears 42b, 46a, and 46b that are interlocked therewith are rockingly rotated. As a result, the arm members in the two arm devices are
The opening and closing operations will be performed in opposition to each other.

That is, the arm member 45 of the arm device 40
a, 45b are closed, which causes the tips 47a, 45b to close.
47b is inserted between the bottom layer and the second layer of anti-slip material, and supports the anti-slip materials stacked above the second layer. During this time, the arm members 41a and 41b of the other arm device 39 are opened in the opposite direction, so their tips 43a and 43b are opened.
One of the lowermost anti-slip members 13 supported by the case 38 falls from the bottom opening 44 of the case 38.

In this way, the anti-slip materials 13 that have fallen from the case 38 one by one are transferred to the open part 44 of the case 38.
The sheet is conveyed to the vicinity of the upper end of the feeding guide 16 by the belt conveyor device 50 disposed directly below the sheet.

Next, the operation of the device according to the present invention will be explained. From the magazine device 17 to the arm devices 39, 4
The anti-slip materials 13 that are intermittently delivered one by one by 0 are arranged in parallel on the belt conveyor device 50 at predetermined intervals. The spacing between the anti-slip materials 13 can be adjusted using, for example, a belt conveyor device 50.
The belt conveyor device 50 may be moved at a constant speed and the time interval of the anti-slip material 13 sent out from the magazine device 17 may be adjusted, or the belt conveyor device 50 may be stopped intermittently at a predetermined position to receive the anti-slip material 13. Any method is fine.

When the number of anti-slip materials 13 reaches a predetermined number and reaches a predetermined position, the belt conveyor device and magazine device stop. At this time, each anti-slip material 13 is
This is also a feeding guide 1 provided in multiple predetermined positions.
6 is located at the upper end of the frame.

Next, the feed rollers 51a and 51b are driven by the operation of a limit switch or the like, and the anti-slip material 1 is driven.
3 into the feeding guide 16.

An example of the mechanism of the feed rollers 51a and 51b is illustrated in FIG. When the belt conveyor 50 reaches , the belt conveyor 50 stops. At this time, the feed rollers 51a and 51b are stopped, the feed roller 51a has retreated to a position away from the feed roller 51b, and one end of the anti-slip material 13 is placed on the feed roller 51b. , which is hanging slightly downward.

Next, the feed roller 51a
b, and the anti-slip material 13 is sandwiched between the two feed rollers 51a and 51b. In this state, the anti-slip material 13 is fed into the feeding guide 16 by driving one or both of the feed roller 51a and the feed roller 51b.

When the tip of the anti-slip material 13 reaches the position of the phototube detector 35a, the detection signal activates the stopper 36 to project the protrusion 37a into the tube, and the anti-slip material is applied to the inner wall of the feeding guide 16. Press to pause the feed. At this time, the feed roller 51a stops driving and moves backward to release the gripping of the non-slip material 13, but the feed roller 51b continues until all the non-slip materials 13 reach a predetermined position (the position of the phototube detector 35a). They continue to rotate.

In this way, all the anti-slip materials 13 are aligned at predetermined positions.

After all the anti-slip materials 13 are aligned in the predetermined positions, the feed roller 51a and the feed roller 51 are moved again.
b is activated, and at the same time the stopper 36 is released and the anti-slip material 13 is supplied. At this time, for example, the distance from the phototube detector 35a to just below the pressure roller 14 is adjusted to the number of revolutions of the feed roller 51a, and the end of the anti-slip material 13 is placed on the pressure roller 14 by rotating the feed roller 51a a predetermined amount. When it reaches directly below, the anti-slip material 13 is stopped by operating the stopper 36 and stopping and releasing the feed rollers 51a and 51b.

In this way, the anti-slip material 13 is attached to the feeding guide 16.
The anti-slip materials 13 are once stopped and aligned, and then sent out a certain distance, so that the ends of all the anti-slip materials 13 are sent directly under the pressure roller.

As described above, the guide support body 29 is raised upward by the link mechanism 34 until the end of the anti-slip material 13 is sent directly under the pressure roller 14.

Next, the pallet 11 transferred by the conveyor device 12 is detected, the guide support body 29 is lowered by the link mechanism 34, and the end of the anti-slip material 13 is pressed and welded to the surface of the pallet 11 by the roller 14. do. By adjusting the timing of the feeding of the pallet 11 and the lowering of the guide support 29, welding can be started at any position, either from the end of the pallet 11 or from the middle.

At this time, it is preferable that the descending speed of the guide support 29 be approximately equal to the transport speed of the pallet in order to obtain a good welding state.

After the ends of the anti-slip material 13 have been welded, the pallets 11 are transported by the conveyor device 12 and welding is performed in sequence.

When the welding progresses and the end of the anti-slip material 13 reaches the phototube detector 65b, the phototube detector 65b detects it and the magazine device 17 starts the next supply.

After the welding is completed, the guide support 29 is raised to prepare for the next welding.

The magazine device 17 shown in FIG.
This is an example of a device for replenishing anti-slip material 13.

This anti-slip material replenishing device 56
The bottom plate 58 is made up of a container 57 for accommodating the container 57 and a bottom plate 58, and the bottom material 58 can be inserted into and withdrawn from an opening provided below the side wall of the container 57.

When the amount of anti-slip material 13 remaining in the magazine device 17 is running low (in this case, it is preferable to provide a display device or the like to display that the amount of anti-slip material 13 remaining is low), as shown in FIG. From the top of the magazine device 17 with side walls
It consists of a container 57 and a bottom plate 58 that are structured to fit into the side wall of the rod-shaped body, and a non-slip material replenishing device 56 containing the non-slip material 13 is inserted therein. This state is shown in FIG. 6B.

Next, by pulling out the bottom plate 58 from the container 57, the non-slip material 13 in the replenishing device 56 rides on the non-slip material 13 remaining in the magazine device 17 (the state shown in FIG. 6C).

Replenishment of the anti-slip material 13 is completed by removing the container 57 as shown in FIG. 6D. If the anti-slip material 13 in the magazine device 17 is reduced, continuous operation becomes possible by repeating the above steps.

7 and 8 show modified examples of the magazine device 17. FIG.

The device shown in FIG. 7 has a mechanism in which the anti-slip materials 13 in the magazine device 17 are taken out one by one using a suction cup 59 that is movable vertically and horizontally. To explain the process, the suction cup 59 located above the magazine device 17 descends, and the magazine device 1
At this time, the suction cup 59 is provided with a pressure detection means to detect the pressure when the suction cup reaches the non-slip material 13 and to perform suction and lifting. ).

The suction cup then moves laterally to place the anti-slip material on a predetermined position on the belt conveyor 50. This process is repeated until a predetermined number of anti-slip materials 13 are lined up on the belt conveyor 50. Thereafter, the anti-slip material 13 is welded by the same process as described above.

FIG. 8 shows a process of supplying the anti-slip material 13 to the magazine device 17 shown in FIG.

As shown in FIG. 8A, when it is detected that the amount of anti-slip material 13 is running low, a push-up device 60 consisting of a cylinder device or the like pushes up the anti-slip material 13 below the magazine device 17 (FIG. 8 A).
Pushed up anti-slip material 13 and cylinder 60
A plate-shaped support 61 is inserted from the side of the magazine device 17 between the magazine device 17 and supports the anti-slip material 13 lifted upward (FIG. 8B). Push-up device 60
is moved back, and a box-shaped anti-slip material container 62 loaded with the anti-slip material 13 to be supplied is placed between the magazine device 17 and the push-up device 60 (FIG. 8C).
This container 62 is open at the top and bottom, but is provided with a removable bottom plate as shown in FIG. 6 during storage.

Next, the pushing up device 60 rises and pushes up the anti-slip material 13 in the container 62 into the magazine device 17 (FIG. 8D). Thereafter, the support 61 is removed and the replenishment is completed (FIG. 8(e)). This process is repeated when the amount of anti-slip material 13 decreases.

According to the surface treatment apparatus for a synthetic resin molded product according to the present invention, the means for supplying the sheet-like anti-slip material 13 stores a large number of the anti-slip materials cut into predetermined lengths in advance and supplies them at an appropriate time. As a magazine device that can feed the feed guide,
A plurality of anti-slip material welding units consisting of a pressure roller, a hot air welding machine and a preheating device are arranged in parallel to form a group of anti-slip material welding units, and a plurality of anti-slip materials are applied to each feeding guide from one magazine device. By feeding the anti-slip materials onto the conveyor device at the same intervals as the feeding guides, it is possible to weld and install a plurality of anti-slip materials on the pallet surface at one time.

Furthermore, since the magazine device 17 can be replenished with the required amount of anti-slip material at any time, there is no need to stop the operation of the entire device when replenishing the anti-slip material. The operating rate will be extremely high.

Note that there are no particular restrictions on the synthetic resin used for the molded product that is surface-treated by the apparatus of the present invention.
Any commercially available synthetic resin such as vinyl chloride resin, styrene resin, polyolefin resin, polyamide resin, polyester resin, etc. may be used. Furthermore, the synthetic resin molded product may be manufactured by any molding method, such as injection molding, extrusion molding, blow molding, rotation molding,
It can also be applied to molded products manufactured by vacuum forming or the like.

On the other hand, as the sheet-like synthetic polymer material to be welded to the surface of these synthetic resin molded products, any known synthetic rubber or synthetic resin can be used, and can be selected depending on the purpose. For example, synthetic polymer sheets with letters or patterns used to apply labels or patterns to the surface of synthetic resin molded products, or properties of the surface of synthetic resin molded products, such as impact resistance,
Examples include various synthetic polymer sheets used to change chemical and physical properties such as chemical resistance, weather resistance, and slipperiness.

When used as an anti-slip material as explained in the above embodiments, any material that can be welded to the surface of a synthetic resin molded product by heating with hot air and has anti-slip properties may be used, such as a low-slip material. Examples include flexible materials selected from density polyethylene, ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers, thermoplastic rubbers, and the like. Furthermore, in such a case, if a welding device is provided above and below the synthetic resin molded product, it is possible to provide the anti-slip material on the top and bottom surfaces at the same time.

Furthermore, in the terminology used in this specification, "sheet-like" should be understood to include a thin film with some thickness.

As explained above, according to the present invention, when a large number of sheet-like synthetic polymer materials cut in advance into predetermined lengths are melt-bonded to the surface of a synthetic resin molded product, each sheet-like synthetic polymer material is Since the feeding guide and the pressure roller are raised from the surface of the synthetic resin molded product each time the synthetic resin molded product is fed, the tip of each sheet of synthetic polymer material is reliably fed directly under the pressure roller. It becomes possible to accurately position the sheet-like synthetic polymer material at a predetermined location on the surface of the synthetic resin molded product and to prevent the occurrence of welding defects at the start of welding.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing a surface treatment apparatus for synthetic resin molded products of the present invention, FIG. 2 is a side view showing a conveyor device for conveying synthetic resin molded products, and FIG. 3 is a front view schematically showing a surface treatment apparatus for synthetic resin molded products of the present invention. FIG. 4 is a perspective view schematically showing an example of a belt conveyor device, and FIG. 5 is a perspective view showing an example of a pressure roller. , FIG. 6 is a perspective view showing an example of the anti-slip material replenishing device as a whole, and FIGS.
Figure 2 shows the replenishment process. FIG. 7 is an explanatory view showing a modified example of the magazine device, and FIGS. 8A to 8E are explanatory views showing the process of replenishing the magazine device shown in FIG. 7 with anti-slip material. 10...Synthetic resin molded product surface treatment device, 11...
...Pallet, 12... Conveyor device, 13... Sheet-like anti-slip material, 14... Press roller, 15...
...Hot air welding machine, 16...Feeding guide, 17...Magazine device.

Claims (1)

[Claims] 1. In a surface treatment device for welding a sheet-like synthetic polymer material to the surface of a synthetic resin molded product, the surface treatment device includes a conveyor device for transporting the synthetic resin molded product in a fixed direction, and a conveyor device located above the conveyor device. a guide support body disposed so as to be movable up and down to move away from and approach the surface of the conveyor device; and a guide support body pivotally attached to the guide support body and elastically biased toward the surface of the synthetic resin molded product. a feeding guide attached to the guide support body for feeding the sheet-like synthetic polymer material between the pressing roller and the synthetic resin molded product; a sheet-like synthetic polymer material supply device that supplies a large number of the sheet-like synthetic polymer material cut into pieces to the feeding guide;
The sheet-like synthetic polymer material is installed near the sheet-like synthetic polymer material feeding port side of the feeding guide and is supplied from the sheet-like synthetic polymer material supply device when the guide support body is raised upward. a pair of feed rollers that feed the material into the feed guide until the tip thereof is positioned directly below the press roller; and the press roller that heats the surface of the synthetic resin molded product and the sheet-like synthetic polymer material. and a hot air welding machine having a hot air outlet supported near the pressure roller so as to face the pressure roller.