Heating device

Abstract

To provide a heating device that can be used to open a melt-cuttable bag without causing chipping of a blade.SOLUTION: A heating device of the present disclosure can be used to open a melt-cuttable bag PK, and the heating device includes a plurality of contact pieces 13a1 that contact the bag PK, and a heating part 13a2 that heats the contact pieces 13a1 to a temperature that can melt the bag PK. When each contact piece 13a1 comes into contact with the melt-cuttable bag PK, it can move individually depending on a pressure applied at the time of contact.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] SUMMARY The present disclosure relates to a heating device that can be used to open a fusible bag. [Background technology]

[0002] In the spraying method, in which a fire-resistant coating material containing a fibrous material such as rock wool is sprayed, the fibrous material is fed into a cotton-opening machine and sent to a spray nozzle, and the fire-resistant coating material is sprayed by pointing the spray nozzle at the target area. The fibrous material used in the cotton opener is packed in resin bags before shipping, and the packed fibrous material is transported in a palletized state.

[0003] At the site where the fire-resistant coating material is sprayed, workers open the bags using a cutter or the like to remove the packed fibrous material, and then feed the removed fibrous material into a cotton-opening machine. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-147904 Summary of the Invention [Problem to be solved by the invention]

[0005] Meanwhile, at large-scale construction sites, large amounts of fibrous materials such as rock wool are used, and with labor shortages becoming a social problem, it is necessary to reduce the labor required for such opening work in order to improve work efficiency.

[0006] Furthermore, when opening a package using a blade, the blade must be frequently replaced due to chipping or other reasons.

[0007] The present disclosure has been made in view of the above circumstances, and one object of the present disclosure is to provide an opening device that can reduce the labor required for opening a package. Another object of the present invention is to provide a heating device that can be used to open fusible bags without causing chipping of the blade. [Means for solving the problem]

[0008] The heating device disclosed herein is a heating device that can be used to open a melt-cuttable bag, and includes a plurality of contact pieces that contact the bag, and a heating unit that heats the contact pieces to a temperature that can melt the bag. [Effects of the Invention]

[0009] According to the present disclosure, an opening device can be provided that can reduce the effort required for opening a package. Furthermore, according to the present disclosure, it is possible to provide a heating device that can be used to open fusible bags without causing chipping of the blade or the like. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a side view of an embodiment of a dispenser according to the present disclosure. [Figure 2] 1 is a schematic diagram for explaining a configuration of an opening device according to an embodiment of the present disclosure. [Figure 3] 10A and 10B are diagrams for explaining a configuration related to one contact portion of an embodiment according to the present disclosure. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. [Figure 5] 10A and 10B are diagrams illustrating a state when a contact portion of an embodiment according to the present disclosure contacts a surface of a bag. [Figure 6] 10A and 10B are diagrams illustrating the movement of the contact piece when the contact portion of the embodiment according to the present disclosure contacts the surface of the bag. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, modes for carrying out the invention (hereinafter referred to as "embodiments") will be described in detail with reference to the accompanying drawings. It should be noted that the same elements are denoted by the same numbers or symbols throughout the description of the embodiments.

[0012] Using the take-out device 1 as an example of a suitable application example of the opening device 13 of the embodiment of the present disclosure, an opening device 13 having a contact portion 13a (heating device) that can be used to open a melt-breakable bag PK will be described. In the following description, the bag PK will be described as being filled with a fibrous material such as rock wool, but the contents of the bag PK do not have to be limited to a fibrous material. For example, the contents of the bag PK may be pellet material, powder, or the like.

[0013] FIG. 1 is a side view of a dispenser 1 according to an embodiment of the present disclosure. In FIG. 1, the frame F1 and the side wall W on the front side of the page are omitted so that the inside can be seen. The side walls W are walls for preventing the contents taken out of the bag PK from spilling out from both the left and right sides of the conveyor 11 when the contents are transported by the conveyor 11 described below.

[0014] <<Extraction device 1>> As shown in Figure 1, the removal device 1 includes a frame F1, a conveyor 11 mounted on the frame F1 so as to be able to move up and down (see arrow AR1), a detector 12 (also called a position detector) mounted on the frame F1 for detecting the position of the fibrous material, and an opening device 13 mounted above the frame F1 so as to be positioned above the conveyor 11, for opening bags PK containing the fibrous material placed on the conveyor 11.

[0015] The take-out device 1 also includes a placement guide portion G, which is provided on the upper portion of the frame F1 and serves as a guide when placing the fibrous material packed in the bag PK at a predetermined position on the conveyor 11.

[0016] [Conveyor 11] In this embodiment, the conveyor 11 is a general belt conveyor, and the lumpy fibrous material removed onto the conveyor 11 is supplied by the conveyor 11 to the receiving port 21 of the device 2 that performs the next processing of the fibrous material.

[0017] In the case of a spraying method in which a fire-resistant coating material is sprayed, for example, the device 2 may be a defibrator that breaks down clumps of fibrous material before supplying the material to a defibrator. In addition, if the cotton-opening machine has an integrated breaking function, the device 2 may also be a cotton-opening machine.

[0018] The conveyor 11 also plays a part in the operation of removing the fibrous material from the bag PK, and the overall operation of the conveyor 11 will be specifically described below.

[0019] First, with the conveyor 11 positioned at the upper position, for example, an operator operates the balancer BL to place one of the fibrous materials packed in the palletized bag PK on the conveyor 11 along the placement guide section G.

[0020] In this way, after placing the fibrous material packed in the bag PK on the conveyor 11, the bag PK is gripped (for example, suction gripped) by the balancer BL, and the balancer BL is locked so that it does not move, and the bag PK is opened by welding three consecutive sides of the lower side surface using the opening device 13 described below.

[0021] Once the package has been opened, the conveyor 11 descends to its lower position. Then, since the upper surface of the bag PK is held by the balancer BL, only the fibrous material moves down together with the conveyor 11.

[0022] At this time, the three sides of the bag PK around the lower side of the side are cut, so as the conveyor 11 descends, the lower surface of the bag PK moves under the fiber material as if being pulled out from the remaining side, and comes out from under the fiber material.

[0023] When the conveyor 11 reaches the lower position, only the fibrous material remains on the conveyor 11. In this way, the take-out device 1 takes out the fibrous material from the bag PK.

[0024] [Detector 12] The detector 12 is, for example, a displacement sensor, and detects that the lump of fiber material taken out on the conveyor 11 has been transported to the device 2 side, and that the fiber material has been transported to an appropriate position.

[0025] As shown in FIG. 1, for example, the detector 12 is mounted on the frame F1 on the device 2 side, which can detect when the conveyor 11 is in the lower position and the transported fibrous mass reaches the appropriate position, as described below. The detector 12 is attached to the frame F1 so as not to interfere with the up and down movement of the conveyor 11.

[0026] As explained above, the conveyor 11 is lowered so that the fibrous material is removed from the bag PK onto the conveyor 11. With the conveyor 11 still positioned at the lower side, the conveyor 11 is driven to transport the fibrous material toward the device 2.

[0027] When the fiber material approaches the device 2 to an appropriate position, the laser light of the detector 12 is blocked by the fiber material, and the distance measured by the detector 12 changes, detecting that the fiber material has been transported to the appropriate position and causing the conveyor 11 to stop operating.

[0028] Thus, once the fibrous material has been delivered to the appropriate position, the conveyor 11 rises to its upper position.

[0029] The conveyor 11 is then driven in the upper position to supply the fibrous material to the device 2 .

[0030] The detector 12 does not need to be limited to a displacement sensor, but may be anything that can detect that the fiber material has been positioned at an appropriate position. For example, the position of the textile material may be detected by combining an imaging device with image analysis software that analyzes the captured image, or LiDAR or the like that can measure the shape and distance of an object may be used.

[0031] In this manner, the take-out device 1 takes out the packed fibrous material from the bag PK and supplies it to the device 2.

[0032] [Opening Device 13] FIG. 2 is a schematic diagram for explaining the configuration of the opening device 13 according to the embodiment of the present disclosure, and is a top view seen from above. 2 is a simplified illustration in which the peripheral components such as the frame (for example, the conveyor 11 and the placement guide portion G in FIG. 1) are omitted for ease of viewing.

[0033] The opening device 13 is a device that opens the bag PK by melting down three of the sides of the bag PK (i.e., three of the four sides of the bag PK), and is attached to the underside of the upper frame F1 as shown in Figure 1.

[0034] The opening device 13 is provided with a fusing section 13A that abuts against three continuous sides of the lower periphery of the side of the bag PK placed on the conveyor 11 when the conveyor 11 (see Figure 1) is located at the upper stop position, as shown in Figure 2, and fusing the remaining three sides of the side except for one side of the side.

[0035] "Fusing section 13A" The fusing portions 13A are provided corresponding to three consecutive sides of the side surface of the bag PK, and include contact portions 13a that reach a temperature capable of fusing the bag PK. That is, the fusing portion 13A has three contact portions 13a arranged in a substantially U-shape so that one contact portion 13a fuses one side of the bag PK.

[0036] The area where the contact portion 13a is not provided is the side where an operator stands to operate the balancer BL (see FIG. 1) and place the bags PK on the conveyor 11, as shown in FIG.

[0037] In this embodiment, a case is shown in which an operator guides the tip of the balancer BL when placing the fibrous material packed in the bag PK on the conveyor 11 that transports the fibrous material. Therefore, although a worker is shown in FIG. 2, an autonomous balancer or the like that automatically transports the workpiece to a predetermined position without the guidance of a worker may also be used.

[0038] The opening device 13 also includes drive units AC that are provided corresponding to the respective contact portions 13a and that move the contact portions 13a in a direction to contact the bag PK and in a direction to move away from the bag PK.

[0039] "Drive unit AC" FIG. 3 is a diagram for explaining a configuration related to one contact portion 13a of an embodiment according to the present disclosure, and is a top view seen from above. FIG. 4 is a cross-sectional view taken along line AA in FIG.

[0040] As shown in FIG. 3, a pair of driving parts AC are provided for each contact part 13a. Specifically, the driving part AC is a cylinder including a piston rod PR connected to the longitudinal end of the contact part 13a, and a cylinder tube C that accommodates a part of the piston rod PR.

[0041] This driving unit AC will be described with reference to FIG. 2. It drives the cylinder in the direction in which the piston rod PR comes out of the cylinder tube C.

[0042] As a result, the contact portion 13a moves in a direction approaching the bag PK, the bag PK is melted by the contact portion 13a, and the bag PK is opened.

[0043] On the other hand, after opening, the cylinder is driven in a direction in which the piston rod PR enters the cylinder tube C, and the contact portion 13a is moved in a direction away from the bag PK.

[0044] Then, the contact portion 13a that had been in contact with the bag PK moves away from the bag PK, so that when the conveyor 11 descends to remove the fibrous material after opening, the contact portion 13a does not get caught on the bag PK, and the good removal of the fibrous material is not hindered.

[0045] Here, we will explain the arrangement (positional relationship) of each abutment portion 13a, which is positioned corresponding to the driving state of the driving unit AC when driving the cylinder in the direction in which the piston rod PR comes out of the cylinder tube C (the driving state when the bag PK is melted and opened).

[0046] For example, if the three abutment portions 13a shown in Figure 2 are located at the same height in the vertical direction, each abutment portion 13a should be positioned so that when the piston rod PR (see Figure 3) is extended to the furthest extent toward the bag PK, it abuts against the bag PK as much as possible, within the range where interference with adjacent abutment portions 13a does not occur. With this arrangement, it is possible to drive the drive unit AC so that the contact portions 13a contact the bags PK simultaneously without having to worry about interference between the contact portions 13a.

[0047] In this way, the fused portions are not connected by the respective contact portions 13a, but the bag PK is torn off by the weight of the fibrous material itself, and the fused portions are connected together, allowing the fibrous material to be removed.

[0048] On the other hand, even if the three abutment portions 13a are positioned at the same height in the vertical direction, in order to more reliably connect the fusion points on the three sides, each abutment portion 13a may be positioned in a position where adjacent abutment portions 13a interfere with each other when the piston rod PR (see Figure 3) is extended to the furthest extent toward the bag PK, and the drive unit AC may be driven to abut the abutment portions 13a against the bag PK with a time lag to avoid interference with adjacent abutment portions 13a.

[0049] For example, the cylinder is driven so that the contact portions 13a corresponding to the opposing sides (the left and right sides in FIG. 2) come into contact with the bag PK, and the opposing sides of the bag PK are melted first.

[0050] After the fusing, the cylinder may be driven to move the contact portions 13a corresponding to the opposing sides (the left and right sides in Figure 2) away from the bag PK, and then the cylinder may be driven to bring the contact portion 13a corresponding to the remaining side (the upper side in Figure 2) into contact with the bag PK, thereby fusing the previously fusing-cut portions together, resulting in three consecutive sides being fusing-cut.

[0051] The order in which the contact portions 13a are brought into contact with the bags PK may be reversed. In other words, before the opposing abutment portions 13a are brought into contact with the bag PK, the abutment portion 13a between them (the upper abutment portion 13a in Figure 2) may be brought into contact with the bag PK, and the abutment portion 13a may be retracted in a direction away from the bag PK, and then the opposing abutment portions 13a may be brought into contact with the bag PK.

[0052] Alternatively, the drive unit AC may be driven so that the three contact portions 13a come into contact with the bag PK sequentially with a time lag. For example, the contact portion 13a on the left side of Figure 2 may be brought into contact with the bag PK, then retracted away from the bag PK, and then the contact portion 13a on the upper side of Figure 2 may be brought into contact with the bag PK and retracted, and finally the contact portion 13a on the right side of Figure 2 may be brought into contact with the bag PK. In this way, when the drive unit AC is driven so that the contact portions 13a come into contact with the bags PK at different times, it is possible to freely determine which of the contact portions 13a should come into contact with the bags PK, as long as interference can be avoided.

[0053] Furthermore, the contact portions 13a may be provided so as to be offset in the height direction to avoid interference between adjacent contact portions 13a. In other words, when viewed from above as shown in Figure 2, each abutment portion 13a is positioned so that when the piston rod PR (see Figure 3) is extended to the furthest extent toward the bag PK, adjacent abutment portions 13a interfere with each other. However, for example, the heightwise position of the abutment portion 13a located between opposing abutment portions 13a (the upper abutment portion 13a in Figure 2) may be set higher or lower to an extent that interference with the opposing abutment portions 13a (the left and right abutment portions 13a in Figure 2) can be avoided.

[0054] By offsetting the positions in the height direction in this way, interference can be avoided, so there is no problem even if the contact portions 13a are brought into contact with the bag PK at the same time.

[0055] However, even in this case, the two opposing welded edges of the bag PK (the left and right edges in Figure 2) and the remaining welded edge between them (the upper edge in Figure 2) are not completely connected when welded, so the offset in the height direction of the abutment portion 13a (the upper abutment portion 13a in Figure 2) located between the opposing abutment portions 13a is set within a range in which the bag PK tears under the weight of the fibrous material and the three welded edges are connected.

[0056] Next, the configuration of the contact portion 13a will be described. The contact portion 13a is a heating device that melts and cuts one side of the bag PK in order to open the bag PK. Therefore, the description of the contact portion 13a also includes a description of a heating device that can be used to open the fusible bag PK.

[0057] (Contact part 13a (heating device)) As shown in Figures 2 and 3, the abutment portion 13a (heating device) includes a plurality of abutment pieces 13a1 arranged adjacent to each other in a substantially straight line, a heating portion 13a2 that heats the abutment pieces 13a1 to a temperature at which the bag PK can be melted, as shown in Figure 4, a guide portion 13a3 that houses one end side of the abutment pieces 13a1 and guides the sliding movement of the abutment pieces 13a1, and a biasing portion 13a4 that biases the abutment pieces 13a1 in the direction of coming out from the guide portion 13a3.

[0058] The contact piece 13a1 is a heat-resistant member made of a metal or other material with good thermal conductivity (e.g., aluminum or stainless steel) with a thickness of approximately 1 mm to 5 mm, and it is preferable that the width along the longitudinal direction of the contact portion 13a is approximately 10 mm to 30 mm, as will be explained later.

[0059] Furthermore, it is preferable that the length of the contact piece 13a1 in the sliding direction is about 50 mm to 100 mm.

[0060] In this embodiment, the heating section 13a2 uses a sheathed heater. For example, a resin bag PK used for packing rock wool or the like can be melted at a temperature of about 110°C. Therefore, by setting the temperature of the sheathed heater to about 150°C, the temperature of the tip of the contact piece 13a1 that contacts the bag PK becomes about 110°C.

[0061] The heating portion 13a2 does not need to be limited to a sheathed heater, and may be, for example, a tape heater that can be provided along the outer surface of the lower side of the guide portion 13a3 shown in FIG.

[0062] In this case, a heat-resistant aluminum tape or the like having a heat resistance temperature of 300° C. or higher may be directly attached to the outer surface of the lower side of the guide portion 13a3.

[0063] As shown in FIG. 4, in this embodiment, the guide portion 13a3 includes a guide groove D1 that houses one end side of the contact piece 13a1 and guides the sliding movement of the contact piece 13a1.

[0064] In addition, the guide portion 13a3 is integrally formed and includes a storage groove D2 that stores the heating portion 13a2, and a lid portion CV that closes the opening of the storage groove D2, and the lid portion CV is fixed to the guide portion 13a3 with a screw S so as to close the opening of the storage groove D2.

[0065] The guide portion 13a3 is made of a heat-resistant material such as metal and having good thermal conductivity (for example, aluminum or stainless steel) so that the heat of the accommodated heating portion 13a2 can be efficiently transferred to the abutment piece 13a1.

[0066] In addition, the member having the accommodating groove D2 and the member having the guide groove D1 may be made as separate members and then combined, and as mentioned above, depending on the type of heater used in the heating section 13a2 and the fixing method, the configuration having the accommodating groove D2 may not be necessary.

[0067] As shown in FIG. 3, the biasing portions 13a4 are provided corresponding to the respective contact pieces 13a1, and in this embodiment, torsion springs are used for the biasing portions 13a4.

[0068] In this embodiment, as shown in FIG. 4, one arm of the torsion spring is engaged with a portion of the guide portion 13a3 having the accommodation groove D2. The other arm of the torsion spring is engaged with the contact piece 13a1 so as to bias the contact piece 13a1 in a direction that causes it to come out of the guide portion 13a3.

[0069] The biasing portion 13a4 does not need to be limited to a torsion spring, but may be, for example, a compression coil spring or the like that is disposed in the guide groove D1 and biases the abutting piece 13a1 in a direction that moves it out of the guide portion 13a3.

[0070] Next, with reference to FIGS. 5 and 6, the state when the contact portion 13a contacts the surface of the bag PK will be described.

[0071] FIG. 5 is a diagram for explaining a state when the contact portion 13a of the embodiment according to the present disclosure contacts the surface of the bag PK. In FIG. 5, a part of the tip of the contact piece 13a1 enters the bag PK, and therefore the tip of the contact piece 13a1 is shown by a dotted line.

[0072] FIG. 6 is a diagram showing the movement of the contact piece 13a1 when the contact portion 13a of the embodiment according to the present disclosure contacts the surface of the bag PK, and corresponds to the cross-sectional view of FIG. In FIG. 6, the position shown in FIG. 4 is indicated by a dotted line so that the position of the tip of the contact piece 13a1 before it comes into contact with the bag PK or the like can be seen.

[0073] In addition, in FIG. 6, the solid line shows a state in which the contact piece 13a1 comes into contact with the bag PK or the like and is moved in the direction into the guide portion 13a3 by the pressing force generated by the contact (see arrow). The torsion spring serving as the biasing portion 13a4 is shown in a state where the contact piece 13a1 moves in a direction into the guide portion 13a3.

[0074] As shown in Figure 5, the side of the bag PK in which rock wool and other materials are packed is not a clean flat surface, but has wavy, uneven surfaces.

[0075] In this embodiment, a plurality of contact pieces 13a1 are provided that are arranged in a substantially straight line, and as shown in FIG. 6, the contact pieces 13a1 can move individually in response to the pressing force when they come into contact with each other.

[0076] Therefore, as shown in FIG. 5, the contact piece 13a1 can contact the shape of the side surface of the bag PK without any gaps, which prevents the occurrence of unblown areas and allows for clean, linear blunt cutting.

[0077] Furthermore, the contact piece 13a1 can contact the shape of the side of the bag PK without any gaps, so even if any part remains that has not been fused, the part that has not been fused is very small and only has enough strength to be naturally cut by the weight of the fibrous material.

[0078] In this way, in order to make it easier for the abutment pieces 13a1 to abut cleanly without gaps, it is better for the width of the abutment pieces 13a1 along the longitudinal direction of the abutment portion 13a to be small. However, if the width of the abutment pieces 13a1 is small, not only will a large number of abutment pieces 13a1 be required, but also a large number of biasing portions 13a4 that bias them will be required.

[0079] Therefore, it is desirable to make the width such that the abutment piece 13a1 can abut cleanly without any gaps, so that there are no parts that are too strong to be melted and that would interfere with the removal of fibrous materials, etc. Specifically, as mentioned above, it is preferable that the width of the abutment piece 13a1 along the longitudinal direction of the abutment portion 13a is approximately 10 mm to 30 mm.

[0080] In addition, bags PK filled with rock wool or the like may have a wavy, uneven surface with a difference of about 25 mm between the protruding and recessed areas, so it is preferable that the sliding distance of the abutment piece 13a1 be 25 mm or more.

[0081] Therefore, taking into consideration the length of one end of the abutment piece 13a1 that is always accommodated in the guide groove D1 that guides the sliding movement of the abutment piece 13a1, as mentioned above, the length of the abutment piece 13a1 in the sliding direction is preferably approximately 50 mm to 100 mm.

[0082] Furthermore, it is desirable that the drive unit AC that moves the abutment portion 13a be able to move the abutment portion 13a by approximately 50 mm to 100 mm, so that the abutment piece 13a1 can be firmly brought into contact with the bag PK filled with rock wool or the like, and the abutment piece 13a1 can be retracted to a position where it will not get caught on the bag PK when the conveyor 11 descends.

[0083] As described above, the opening device 13 of this embodiment is equipped with a fusing section 13A that abuts against three consecutive sides of the bag PK and fuses the three consecutive sides of the bag PK, even if the bag PK has a square box-like outer shape, such as a bag PK filled with rock wool or the like, and therefore can open the bag in a manner suitable for removing the fiber material.

[0084] The opening operation is extremely simple, as it only requires setting the bag PK containing the rock wool or the like and driving the drive unit AC, which significantly reduces the labor required for the opening operation.

[0085] Furthermore, the contact portion 13a (heating device) provided in the opening device 13 does not use a blade for cutting, so chipping of the blade or the like does not occur.

[0086] On the other hand, depending on the state of the bag, it may be necessary to cut the bag PK in a straight line when opening it. In such cases, only one contact portion 13a (heating device) is required, and that contact portion 13a (heating device) can be used to make a single straight cut in the bag PK. In this case too, since no blade is used, chipping of the blade or the like does not occur.

[0087] Although the present disclosure has been described above based on specific embodiments, it should be understood that the present disclosure is not limited to the above embodiments.

[0088] For example, the contact portion 13a (heating device) may be used as a fusing portion of a tool that can be held by the worker to perform the opening operation.

[0089] Specifically, the tool is a tool in which a gripping portion that is gripped by an operator is provided on the contact portion 13a (heating device).

[0090] As mentioned above, the contents of the bag PK may be pellet material, powder, or the like, as long as it is heat-resistant and will not be affected by the heat generated when fusing to open the bag.

[0091] Furthermore, considering that the temperature required for fusing when opening varies depending on the heat resistance of the bag PK, it is considered good if the contents of the bag PK are more heat resistant than the bag PK itself.

[0092] In this way, modifications and improvements to the embodiments are also included in the technical scope, and this will be clear to those skilled in the art from the description of the claims. [Explanation of symbols]

[0093] 1···Removal device, 11···Conveyor, 12···Detector, 13···Opening device, 13A···Fusing section, 13a···Contact section, 13a1···Contact piece, 13a2···Heating section, 13a3···Guide section, 13a4···Pressing section, 2···Device, 21···Receiving port, AC···Drive section, BL···Balancer, C···Cylinder tube, CV···Cover section, D1···Guide groove, D2···Accommodation groove, F1···Frame, G···Placement guide section, PK···Bag, PR···Piston rod, S···Screw

Claims

1. 1. A heating device that can be used to open a fusible bag, comprising: The heating device is a plurality of contact pieces that contact the bag; a heating unit that heats the contact piece to a temperature at which the bag can be melted.

2. 2. The heating device according to claim 1, wherein each of the contact pieces can move independently in response to a pressing force applied when the contact pieces are in contact with each other.

3. The heating device is a guide portion that houses one end of the contact piece and guides the sliding movement of the contact piece; The heating device according to claim 1 or 2, further comprising: a biasing portion that biases the contact piece in a direction coming out of the guide portion.

4. The heating device according to claim 1 or 2, wherein the abutment pieces are arranged adjacent to each other.

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