JP7684097B2 - Welding Tools - Google Patents

Description

The present invention relates to a welding tool that uses heat to weld overlapping resin sheet-like areas.

For example, when small parts to be used in products are manually sorted and packed at a manufacturing site, the parts are placed in a roughly rectangular plastic bag with an opening at one end, the opening is closed and the bag is folded toward the other end, and the folded end is fixed to the side of the bag with tape.

However, if the adhesive strength of the tape is weak, the tape may come off, causing the packaged parts to fall out of the bag. Furthermore, it is cumbersome to manually fold one end of the bag and then cut out the tape and tape the folded end to the side of the bag.

In response to this, a handheld heat sealer is known that has a rotary heating mechanism and a receiving table, and moves in a predetermined direction while pressing and heating the linear portions of the workpiece to be welded with the rotary heating mechanism and the receiving table, thereby welding the linear portions (see, for example, Patent Document 1).

When a plastic bag with an opening at one end is sealed with this heat sealer, for example, the straight line portion near the opening is pressed and heated. If the straight line portion to be sealed is formed slightly toward the other end of the bag from the one end, a shallow, bag-like excess portion is formed between the welded straight line portion and the one end of the bag.

JP 2006-264695 A

To cut off this excess, a cutter or scissors must be used in addition to the heat sealer, which takes time and effort. The present invention was made in consideration of these problems, and aims to reduce the effort required for welding and cutting off the excess after welding, thereby shortening the work time.

According to one aspect of the present invention, there is provided a welding tool for welding overlapping resin sheet-like regions by utilizing heat, the welding tool comprising: a rod-shaped first clamping portion and a second clamping portion; a connecting portion having a rotation axis and connecting one end of the first clamping portion and the second clamping portion so as to be relatively rotatable around the rotation axis; a pressing body provided on the other end side of the first clamping portion or the second clamping portion and capable of pressing the sheet-like region sandwiched between the first clamping portion and the second clamping portion; a cutting blade disposed on the first clamping portion or the second clamping portion on the connecting portion side relative to the pressing body or a position corresponding to the pressing body; a first heater for heating the pressing body; and a heating element for heating the cutting blade. and a second heater, wherein the pressing body is fixed to the first heater via a fixing member, heat is transferred to the pressing body from the first heater via the fixing member, the cutting blade is in direct contact with the second heater, heat is transferred to the cutting blade from the second heater, and when the first clamping portion and the second clamping portion are slid along a predetermined direction perpendicular to the longitudinal direction of the first clamping portion while the sheet-like region is clamped between the first clamping portion and the second clamping portion, a first linear portion of the sheet-like region pressed by the pressing body is welded, and a second linear portion of the sheet-like region in contact with the cutting blade is cut. Preferably, the welding tool includes a first receiving portion provided in the other of the first and second clamping portions, which is different from the one of the clamping portions where the pressing body is provided, and provided at a position corresponding to the pressing body when the other end sides of the first and second clamping portions are brought close to each other; and a second receiving portion provided in the other of the first and second clamping portions, which is different from the one of the clamping portions where the cutting blade is provided, and provided at a position corresponding to the other end sides of the first and second clamping portions. The cutting blade further comprises a second receiving portion provided at a position corresponding to the cutting blade when the first side is brought close to the cutting blade, a third heater for heating the first receiving portion, and a fourth heater for heating the second receiving portion, wherein when the first heater and the second heater are the same heater, the third heater and the fourth heater are the same heater, and when the first heater and the fourth heater are the same heater, the second heater and the third heater are the same heater .

When the welding tool according to one aspect of the present invention is used, when the overlapping sheet-like regions are clamped between the first clamping portion and the second clamping portion and the first clamping portion and the second clamping portion are slid along a predetermined direction perpendicular to the longitudinal direction of the first clamping portion, the first linear portion of the sheet-like region pressed by the pressing body is welded, and the second linear portion of the sheet-like region that comes into contact with the cutting blade is cut. In this way, welding and cutting can be performed simultaneously, reducing the effort required for welding and cutting and shortening the work time.

FIG. 11 is an enlarged, partially cross-sectional side view of the other end of the first housing. FIG. FIG. 3A is a partially sectional side view of the heat sealer, and FIG. 3B is a front view of the heat sealer. FIG. 4A is a diagram showing the state in which a bag is placed in a heat sealer, and FIG. 4B is a diagram showing the state in which the bag is sandwiched by the heat sealer. FIG. 5A is a diagram showing how the heat sealer is slid, and FIG. 5B is a diagram showing how the mouth portion is approximately closed by the heat sealer. FIG. 6A is a diagram showing the heat-sealed area and the cut area, and FIG. 6B is a diagram showing the state in which the excess portion has been cut off. FIG. 7A is an enlarged, partially sectional side view of the other end of the first housing, and FIG. 7B is a front view of the heat sealer. FIG. 8A is an enlarged, partially sectional side view of the other end of the first housing, and FIG. 8B is a front view of the heat sealer. 4 is an enlarged, partially cross-sectional side view of the other end of the heat sealer. FIG. 4 is an enlarged, partially cross-sectional side view of the other end of the heat sealer. FIG. 4 is an enlarged, partially cross-sectional side view of the other end of the heat sealer. FIG.

An embodiment of the present invention will be described with reference to the attached drawings. FIG. 1 is a perspective view of a handheld heat sealer (welding tool) 2 according to a first embodiment in an open state. The heat sealer 2 is used to weld overlapping resin sheet-like regions together by applying heat and pressure to both sides of the sheet-like regions.

The overlapping sheet-like regions are, for example, a first sheet-like region 11b and a second sheet-like region 11c that form a bag 11 (see FIG. 4A) having a mouth portion 11a. The first sheet-like region 11b and the second sheet-like region 11c are formed, for example, from a synthetic resin.

Examples of synthetic resin materials that can be used include polyolefins such as polyethylene (PE) and polypropylene (PP), polyesters such as polyethylene terephthalate (PET), polyamides such as nylon, and polyvinyl chloride (PVC).

The heat sealer 2 has a first housing (first clamping part) 4 and a second housing (second clamping part) 6, each of which is a rectangular rod made of resin. The first housing 4 and the second housing 6 are formed, for example, by a 3D printer, but may also be formed by other methods such as injection molding.

The first housing 4 and the second housing 6 have a long side A1 of about 10 cm to 20 cm, a short side A2 of about 2 cm to 3 cm, and a thickness A3 of about 2 cm to 3 cm. One side 4a of the first housing 4 and one side 6a of the second housing 6 are arranged to face each other.

A shaft portion 10 having a rotation shaft 8 is fixed to one end portion 4b on the side 4a of the first housing 4. A pair of bearings 12 are provided on both sides of the shaft portion 10. Each bearing 12 is fixed to one end portion 6b on the side 6a of the second housing 6.

The shaft portion 10 and the pair of bearings 12 function as a connecting portion 14 that connects the first housing 4 and the second housing 6 so that they can rotate relatively around the rotation axis 8.

One end of the compression coil spring 16 is fixed to a predetermined position on the surface 4a on the other end 4c side of the shaft portion 10, and the other end of the compression coil spring 16 is fixed to a predetermined position on the surface 6a on the other end 4c side of the shaft portion 10.

The compression coil spring 16 pushes the first housing 4 and the second housing 6 outward so that the other ends 4c and 6c move away from each other, and the first housing 4 and the second housing 6 enter an open state in which they are open by a predetermined angle 18 about the pivot axis 8.

On the other hand, when an operator grasps the first housing 4 and the second housing 6 with one hand (for example, with one hand) and compresses the compression coil spring 16, the other ends 4c and 6c approach each other. Finally, when the first faces 4a and 6a become approximately parallel to each other, the heat sealer 2 enters a closed state (see FIG. 3(A)).

As shown in FIG. 1, in the longitudinal direction B1 of the first housing 4 along the long side A1, a disk-shaped roller (pressure body) 20 made of a metal such as stainless steel and having a predetermined thickness is provided on the other end 4c side of one surface 4a of the first housing 4. The roller 20 is disposed approximately in the center of the short side A2, and its rotation axis is approximately parallel to the longitudinal direction B1.

The roller 20 has a bearing in its radial center. A metal shaft portion 22 (see FIG. 2) arranged along the longitudinal direction B1 of the first housing 4 is inserted into the bearing of the roller 20, and the roller 20 can rotate around the shaft portion 22.

A recess (not shown) is formed on the side 4a of the first housing 4, and a part of the roller 20 is located inside the side 4a of the first housing 4. As shown in FIG. 2, both ends of the shaft 22 are bent approximately 90 degrees along the direction of the thickness A3 of the first housing 4, and are located inside the first housing 4 with respect to the roller 20.

Figure 2 is a partially sectional side view showing an enlarged view of the other end 4c of the first housing 4. Inside the first housing 4, a plate-shaped ceramic heater (first heater and second heater) 24 for heating the roller 20 is provided. Both ends of the shaft 22 are fixed to the ceramic heater 24 by fixing members 26 made of silicone rubber, which has relatively high thermal conductivity.

Silicone rubber with relatively high thermal conductivity contains, for example, a quick-drying silicone adhesive that can be cured at room temperature, and a filler such as silica that has higher thermal conductivity than resins such as cured silicone adhesive, and has a thermal conductivity of 0.8 [W/(m·K)] or more in the cured state.

As an example of such silicone rubber, a silicone adhesive sealant (product number: TSE3941M) sold by Momentive Performance Materials Japan LLC can be used.

In this embodiment, the shaft portion 22 is fixed by the fixing member 26 in such a manner that the fixing member 26 is sandwiched between the shaft portion 22 and the ceramic heater 24. Therefore, the heat of the ceramic heater 24 is indirectly transferred to the shaft portion 22 and the roller 20 via the fixing member 26.

Therefore, the roller 20 can press the object to be welded while heating it. However, due to the intervening fixing member 26, the temperature of the roller 20 will be lower than the temperature of the ceramic heater 24. For example, if the object to be welded is made of polyethylene (PE), the ceramic heater 24 is heated to about 180°C. At this time, the roller 20 will reach about 160°C.

However, the temperature of the ceramic heater 24 may be adjusted as appropriate depending on the material to be welded. By making the temperature of the roller 20 lower than the temperature of the ceramic heater 24, excessive melting of the material to be welded can be prevented.

In the drawings, the ceramic heater 24 is simplified, and wiring and the like provided on the ceramic heater 24 are omitted. Power is supplied to the ceramic heater 24 from an AC power source (not shown) via an AC-DC adapter (not shown).

In this way, the ceramic heater 24 of this embodiment is heated using an AC power source rather than a dry cell, so the size and weight of the first housing 4 can be made smaller and lighter than when a power source section such as a dry cell and a fuel section such as liquid fuel are placed in the first housing 4.

A disc-shaped cutting blade 28 made of a metal such as stainless steel and thinner than the roller 20 is provided a predetermined distance (e.g., about 5 mm) toward the connecting portion 14 from the roller 20. The cutting blade 28 is arranged so that one surface thereof is perpendicular to the longitudinal direction B1 of the first housing 4.

In the thickness A3 direction of the first housing 4, a part of the cutting blade 28 protrudes outward from one surface 4a of the first housing 4. Another part of the cutting blade 28 is located inside one surface 4a of the first housing 4 and is fixed to the ceramic heater 24 by a fixing member 26, similar to the roller 20.

The cutting blade 28 is fixed by the fixing member 26 in a manner that makes direct contact with the ceramic heater 24. Therefore, the heat of the ceramic heater 24 is directly transferred to the cutting blade 28. For example, when the ceramic heater 24 is heated to about 180°C, the cutting blade 28 also becomes about 180°C.

The cutting blade 28 can cut the resin sheet-like region by softening or melting the target portion of the sheet-like region with heat, so the sheet-like region can be cut relatively easily compared to when the cutting blade 28 is not heated. In this embodiment, the tip of the cutting blade 28 protrudes a predetermined length (e.g., about 1 mm) toward the second housing 6 compared to the tip of the roller 20.

Returning to FIG. 1, a first receiving portion 30 made of silicone rubber, which has relatively high thermal conductivity, is provided on one surface 6a of the second housing 6. A second receiving portion 32 is provided on the one surface 6a, closer to the connecting portion 14 than the first receiving portion 30.

In this embodiment, the second receiving portion 32 is integral with the first receiving portion 30 and is made of silicone rubber, which has relatively high thermal conductivity. The heights of the first receiving portion 30 and the second receiving portion 32 are approximately the same, but may be different.

Figure 3 (A) is a side view of the heat sealer 2 in the closed state, and Figure 3 (B) is a front view of the heat sealer 2 in the closed state. When the compression coil spring 16 is compressed to close the heat sealer 2, the surfaces 4a and 6a approach each other to a predetermined distance C and become approximately parallel.

At this time, the roller 20 is close to the first receiving portion 30 with a small gap between them, and the cutting blade 28 contacts or cuts into the second receiving portion 32. In Figures 3(A) and 3(B), the gap between the roller 20 and the first receiving portion 30 is omitted, but this gap is adjusted to be slightly smaller than the thickness of the sheet-like areas that are overlapped with each other.

A recess (not shown) is formed on one surface 6a of the second housing 6, and a plate-shaped ceramic heater 34 for heating the first receiving portion 30 and the second receiving portion 32 is provided inside the one surface 6a of the second housing 6. Note that the ceramic heater 34 is simplified in the drawings, and its wiring, etc. are omitted.

The ceramic heater 34 is heated in the same manner as the ceramic heater 24. The surfaces of the first receiving portion 30 and the second receiving portion 32 that are located on the opposite side of the ceramic heater 34 in the thickness direction are heated to a lower temperature than the ceramic heater 34.

For example, when the ceramic heater 34 is heated to approximately 180°C, the surface temperatures of the first receiving part 30 and the second receiving part 32 are approximately 160°C. However, the temperature of the ceramic heater 34 may be adjusted as appropriate depending on the material to be fused.

By making the surface temperature of the first receiving portion 30 and the second receiving portion 32 lower than the temperature of the ceramic heater 34, the sheet-like area in contact with the surface can be softened while preventing excessive melting of the contact area.

In this embodiment, power is also supplied to the ceramic heater 34 via an AC-DC adapter, so the size and weight of the second housing 6 can be made smaller than when a power supply unit such as a dry cell and a fuel unit such as liquid fuel are placed in the second housing 6.

As shown in FIG. 3A, a plug insertion hole 36 into which a plug (not shown) of an AC-DC adapter (not shown) is inserted is provided on the side of the second housing 6. In addition, a manual switch 38 for switching on/off is provided on the other surface 6d, which is located on the opposite side to the surface 6a of the second housing 6.

On the other side 6d, in addition to the switch 38, there is also a first LED lamp 40 that lights up in red when the temperature of the ceramic heaters 24, 34 rises, and a second LED lamp 42 that lights up in white when the ceramic heaters 24, 34 are kept warm.

Next, a method of using the heat sealer 2 will be described with reference to Figures 4(A) to 6(B). First, after turning on the switch 38 of the heat sealer 2, the vicinity of the mouth 11a of the resin bag 11 is placed on the first receiving part 30 and the second receiving part 32 as shown in Figure 4(A) (placement process).

Figure 4 (A) shows a state in which a part of the bag 11 is placed between a pair of other ends 4c, 6c of the heat sealer 2. The bag 11 may be formed of one resin sheet, or may be formed of two or more resin sheets. In either case, at least two resin sheet-like regions are overlapped on each other in the area sandwiched by the heat sealer 2.

In the example shown in Figures 4(A) and 4(B), the first sheet-like region 11b and the second sheet-like region 11c are overlapped with each other. After the placement process, the worker holds the heat sealer 2 by hand and compresses the compression coil spring 16 to bring the first surfaces 4a and 6a closer to each other by a predetermined distance C (clamping process).

Figure 4 (B) shows a state in which a part of the bag 11 is clamped between the pair of other ends 4c, 6c of the heat sealer 2. In the clamping process, a part of the first sheet-like region 11b and the second sheet-like region 11c located near the mouth 11a are heated and pressed by the roller 20 and the first receiving part 30. At the same time, the vicinity of the part is cut by the cutting blade 28 and the second receiving part 32.

After the clamping process, the heat sealer 2 is slid along a specific direction B2 that is perpendicular to the longitudinal direction B1 and parallel to the short side A2 (sliding process). Figure 5(A) shows how the heat sealer 2 is slid along the specific direction B2, and Figure 5(B) shows how the mouth 11a is roughly closed by the heat sealer 2.

In the sliding process, the first linear portion 11d of the first sheet-like region 11b and the second sheet-like region 11c pressed by the roller 20 is welded to each other, and the second linear portion 11e that contacts the cutting blade 28 is cut (see FIG. 6A).

Figure 6 (A) is a diagram showing the heat-sealed area (first linear portion 11d) and the cut area (second linear portion 11e). In Figure 6 (A), the second linear portion 11e is shown by a dashed line. Figure 6 (B) is a diagram showing how the excess portion 13 is cut off at the boundary of the second linear portion 11e.

In this embodiment, welding and cutting can be performed simultaneously using the roller 20 and the cutting blade 28, which reduces the labor required for welding and cutting. Furthermore, the work time can be reduced compared to when welding and cutting are performed separately.

In addition, by simultaneously heating and pressing both sides of the bag 11 (first sheet-like region 11b, second sheet-like region 11c) using the roller 20 and the first receiving portion 30, the first linear portion 11d of the bag 11 can be welded more reliably than when only the roller 20 is heated.

Furthermore, by simultaneously heating and cutting both sides of the bag 11 using the cutting blade 28 and the second receiving portion 32, the second linear portion 11e of the bag 11 can be cut more easily than when only the cutting blade 28 is heated.

In addition, in this embodiment, the roller 20 and the cutting blade 28 are heated simultaneously by one ceramic heater 24, but the temperature of the roller 20 can be lowered below the temperature of the cutting blade 28, so that excessive melting of the heat-sealed area can be prevented while smooth cutting can be performed in the cutting area.

Next, the second embodiment will be described. Fig. 7(A) is a partially cross-sectional side view showing an enlarged view of the other end 4c of the first housing 4 according to the second embodiment, and Fig. 7(B) is a front view of the heat sealer 2 according to the second embodiment.

As shown in FIG. 7(A), the first housing 4 of the second embodiment is provided with a sphere (pressure body) 44 made of a metal such as stainless steel instead of the roller 20. The sphere 44 is fixed to the ceramic heater 24 by a fixing member 26.

The sphere 44 is fixed by the fixing member 26 in such a manner that the fixing member 26 is sandwiched between the sphere 44 and the ceramic heater 24. Therefore, the heat of the ceramic heater 24 is indirectly transferred to the sphere 44 via the fixing member 26.

As shown in FIG. 7(B), when the heat sealer 2 is in the closed state, the sphere 44 is close to the first receiving part 30 with a small gap between them, and the cutting blade 28 contacts or cuts into the second receiving part 32. However, in FIG. 7(B), the gap between the sphere 44 and the first receiving part 30 is omitted.

In the second embodiment, welding and cutting can be performed simultaneously using the sphere 44 and the cutting blade 28, so the labor required for welding and cutting can be reduced. Furthermore, the work time can be reduced compared to when welding and cutting are performed separately.

In addition, the roller 20 and the first receiving portion 30 can simultaneously heat and press both sides of the bag 11, and the cutting blade 28 and the second receiving portion 32 can simultaneously heat and cut both sides of the bag 11.

In addition, the roller 20 and cutting blade 28 are heated simultaneously by a single ceramic heater 24, but the temperature of the roller 20 can be lowered below the temperature of the cutting blade 28, so that smooth cutting can be performed in the cutting area while preventing excessive melting in the heat-sealed area.

Next, the third embodiment will be described. Fig. 8(A) is a partially cross-sectional side view showing an enlarged view of the other end 4c of the first housing 4 according to the third embodiment, and Fig. 8(B) is a front view of the heat sealer 2 according to the third embodiment.

The sphere 44 is held rotatably in any direction by a metal holder 46 with a spherical recess. Therefore, when the heat sealer 2 is slid along the specified direction B2 in the sliding process, the sphere 44 can rotate around a rotation axis 44a along the longitudinal direction B1.

In the third embodiment, the heat sealer 2 can slide more smoothly during the sliding process, making welding and cutting easier than in the second embodiment.

The holding portion 46 is fixed by the fixing member 26 in such a manner that the fixing member 26 is sandwiched between the holding portion 46 and the ceramic heater 24. Therefore, the heat of the ceramic heater 24 is indirectly transferred to the holding portion 46 and the sphere 44 via the fixing member 26.

Next, various modified examples of the first embodiment will be described. Figure 9 is a partially cross-sectional side view showing an enlarged view of the other ends 4c and 6c of the heat sealer 2 according to the first modified example. Note that Figure 9 shows the heat sealer 2 in a closed state, similar to Figure 3(A).

The roller 20 is provided on the other end 4c side of the first housing 4, and the shaft portion 22 is fixed to the ceramic heater 24 via a first fixing member 26a made of silicone rubber, which has relatively high thermal conductivity.

A second receiving portion 32 is provided on the connecting portion 14 side of the roller 20 to receive the cutting blade 28 when the heat sealer 2 is in the closed state. The second receiving portion 32, like the first fixing member 26a, is made of silicone rubber, which has relatively high thermal conductivity, and is formed integrally with the first fixing member 26a.

In contrast, the second housing 6 is provided with a first receiving portion 30 at a position corresponding to the roller 20 when the heat sealer 2 is in the closed state. In addition, in the second housing 6, a cutting blade 28 is disposed on the connecting portion 14 side of the first receiving portion 30.

The cutting blade 28 is fixed in contact with the ceramic heater 34 by a second fixing member 26b made of silicone rubber, which has relatively high thermal conductivity. The second fixing member 26b is formed integrally with the first receiving portion 30.

In the first modified example, the ceramic heater 24 functions as a first heater that heats the roller 20 and a fourth heater that heats the second receiving portion 32. The ceramic heater 34 also functions as a third heater that heats the first receiving portion 30 and a second heater that heats the cutting blade 28.

In the first modified example, when the heat sealer 2 is in the closed state, the roller 20 is close to the first receiving part 30 with a small gap between them (see the downward arrow in Figure 9), and the cutting blade 28 contacts or cuts into the second receiving part 32 (see the upward arrow in Figure 9).

Next, a second modified example will be described. FIG. 10 is a partially sectional side view showing an enlarged view of the other end 4c, 6c of the heat sealer 2 according to the second modified example. The roller 20 is provided on the other end 6c side of the second housing 6, and the shaft portion 22 is fixed to the ceramic heater 34 via the first fixing member 26a.

A second receiving portion 32 is formed integrally with the first fixed member 26a on the connecting portion 14 side of the roller 20. In contrast, a first receiving portion 30 is provided on the first housing 4 at a position corresponding to the roller 20 when the heat sealer 2 is in the closed state.

In addition, in the first housing 4, the cutting blade 28 is disposed closer to the connecting portion 14 than the position of the first receiving portion 30. The cutting blade 28 is fixed in a manner in which it contacts the ceramic heater 34 by the second fixing member 26b. The second fixing member 26b is formed integrally with the first receiving portion 30.

In the second modified example, the ceramic heater 24 functions as a third heater that heats the first receiving portion 30 and a second heater that heats the cutting blade 28. The ceramic heater 34 functions as a first heater that heats the roller 20 and a fourth heater that heats the second receiving portion 32.

In the second modified example, when the heat sealer 2 is in the closed state, the roller 20 approaches the first receiving part 30 with a small gap between them (see the upper arrow in Figure 10), and the cutting blade 28 contacts or cuts into the second receiving part 32 (see the lower arrow in Figure 10).

Next, a third modified example will be described. FIG. 11 is a partially sectional side view showing an enlarged view of the other end 4c, 6c of the heat sealer 2 according to the third modified example. As in the second modified example, the roller 20 is provided on the other end 6c side of the second housing 6, and the shaft portion 22 is fixed to the ceramic heater 34 via the fixing member 26.

In the second housing 6, a cutting blade 28 is disposed closer to the connecting portion 14 than the roller 20, and is fixed by a fixing member 26 in such a manner that it contacts the ceramic heater 34. In contrast, the first housing 4 is provided with a first receiving portion 30 at a position corresponding to the roller 20 when the heat sealer 2 is in the closed state.

In addition, in the first housing 4, the second receiving portion 32 is disposed on the connecting portion 14 side of the position of the first receiving portion 30. The first receiving portion 30 and the second receiving portion 32 are integrally formed.

In the third modified example, the ceramic heater 24 functions as a third heater that heats the first receiving portion 30 and a fourth heater that heats the second receiving portion 32. The ceramic heater 34 also functions as a first heater that heats the roller 20 and a second heater that heats the cutting blade 28.

In the third modified example, when the heat sealer 2 is in the closed state, the roller 20 is close to the first receiving part 30 with a small gap between them (see the upper arrow in Figure 11), and the cutting blade 28 contacts or cuts into the second receiving part 32 (see the upper arrow in Figure 11).

In addition, the structures, methods, etc. according to the above-mentioned embodiments can be modified as appropriate without departing from the scope of the purpose of the present invention. For example, the first to third modified examples can be applied to each of the second and third embodiments.

2: Heat sealer (welding tool)
4: first housing (first clamping portion), 4a: one surface, 4b: one end, 4c: other end 6: second housing (second clamping portion), 6a: one surface, 6b: one end, 6c: other end 6d: other surface, 8: rotation shaft, 10: shaft portion 11: bag, 11a: mouth portion, 11b: first sheet-like region, 11c: second sheet-like region 11d: first linear portion, 11e: second linear portion, 13: excess portion 12: bearing, 14: connecting portion, 16: compression coil spring, 18: angle 20: roller ( A1: Long side, A2: Short side, A3: Thickness, B1: Longitudinal direction, B2: Predetermined direction, C: Distance

Claims (2)

A welding tool for welding overlapping resin sheet-like regions by using heat,
a first clamping portion and a second clamping portion each having a rod shape;
a connecting portion having a rotation axis and connecting one end of the first clamping portion and one end of the second clamping portion to each other so as to be relatively rotatable around the rotation axis;
a pressing body provided on the other end side of the first clamping portion or the second clamping portion and capable of pressing the sheet-like region sandwiched between the first clamping portion and the second clamping portion;
A cutting blade disposed on the first clamping portion or the second clamping portion closer to the connecting portion than the pressing body or a position corresponding to the pressing body;
a first heater for heating the pressing body;
a second heater for heating the cutting blade;
Equipped with
the pressing body is fixed to the first heater via a fixing member, and heat is transferred from the first heater to the pressing body via the fixing member;
The cutting blade is in direct contact with the second heater, and heat is transferred from the second heater to the cutting blade;
A welding tool characterized in that, when the sheet-like region is clamped between the first clamping portion and the second clamping portion and the first clamping portion and the second clamping portion are slid along a predetermined direction perpendicular to the longitudinal direction of the first clamping portion, a first linear portion of the sheet-like region pressed by the pressing body is welded and a second linear portion of the sheet-like region that comes into contact with the cutting blade is cut. a first receiving portion provided in one of the first and second clamping portions, which is different from the one clamping portion in which the pressing body is provided, and provided at a position corresponding to the pressing body when the other end sides of the first and second clamping portions are brought close to each other;
a second receiving portion provided on the other of the first and second clamping portions, which is different from the one clamping portion on which the cutting blade is provided, and provided at a position corresponding to the cutting blade when the other end sides of the first and second clamping portions are brought close to each other;
a third heater for heating the first receiving portion;
and a fourth heater that heats the second receiving portion,
when the first heater and the second heater are the same heater, the third heater and the fourth heater are the same heater;
2. The welding tool of claim 1, wherein when the first heater and the fourth heater are the same heater, the second heater and the third heater are the same heater.

Images