Claims
[1] A hot-air welder for waterproofing tape having a lower roller driver, comprising a main body 100 having a work table 101 of a flat plate shape, a hot-air generating means 110 and an upper roller 111, a lower roller 10 arranged below and in correspondence with said upper roller 111, and a roller support 20 which is mounted on the work table 101 of said main body 100 and has said lower roller 10 mounted rotatably at the top end, wherein said lower roller 10 is an ellipsoidal rotating body in the center of which is formed a straight- line portion 11 and on both sides of the straight- line portion are formed curve portions 12 and 12' having a reduced diameter that is decreasing gradually as it goes toward the end portion, and is rotated by power transmitted from a drive motor 13 mounted underneath said work table 101, and said roller support 20 is provided with a lower roller driver which makes pivot motion to right or left by power transmitted from a pivot means 40 mounted underneath the work table 101, so as to selectively position either the straight- line portion of the lower roller 10 or one of the curve portions 12 and 12' on both sides of the straight- line portion in correspondence with the upper roller 111. [2] The hot-air welder of Claim 1, wherein the curve portions 12 and 12' on both sides formed on the lower roller 10 have a center point C at the identical location and the center point C is located on a vertical center line of the lower roller 10. [3] The hot-air welder of Claim 1, wherein said lower roller 10 is rotated by the rotatory force of a drive motor 13 transmitted through a chain 14 located vertically inside the roller support 20; the top section of said chain 14 is wound on a first sprocket 15 fixed on a rotary axis 15' and the bottom section is wound on a second sprocket 17 fixed on a rotary axis 17'; at one end of the rotary axis 15 is fixed a drive gear 16 for transmitting the rotatory force of the motor transmitted through a chain 14 to the lower roller 10 and the drive gear 16 is in mesh with a driven gear 16' fixed at one end of the lower roller 10; and said rotary axis 17' is joined to the bottom end of the roller support 20 to transmit the rotatory force of the drive motor 13 transmitted through a power axis 13' to said lower roller 10 through the chain 14.
[4] The hot-air welder of Claim 3, wherein the end portion of the rotary axis 17 with the second sprocket 17 fixed and the end portion of the power axis 13' of the drive motor 13 are connected by a universal joint 18, so that power transmission is possible within a range of a predetermined variable angle and length. [5] The hot-air welder of Claim 1, wherein said pivot means 40 comprises a guide plate 41 which is installed vertically on the work table 101 on at least one side of the roller support 20 and has guide holes 42 and 42' formed in an arc shape with a predetermined interval between up and down; guide pins 21 and 21' one end of which is fixed on said roller support 20 and the other end of which is slidably inserted into said guide holes 42 and 42'; first and second lead screws 44 and 44' which are arranged with a predetermined interval between up and down on the guide plate 41 in correspondence with said guide holes 42 and 42'; a forward-reverse motor 30 which forwardly or reversely rotates said first an second screws 44 and 44' by a plurality of transmission gears 45 and 45'; and screw guides 43 and 43' which are mounted on the first and second lead screws 44 and 44' and transmit the rotatory force of said forward-reverse motor 30 transmitted through said first and second lead screws 44 and 44' to said roller support 20 through said guide pins 21 and 21', as the middle portions of said guide pins 21 and 21' are joined.
[6] The hot-air welder of Claim 5, wherein said first and second lead screws 44 and
44' receive the rotatory force from the forward-reverse motor 30 through the plurality of transmission gears 45 and 45'; and when rotating the roller support 20 by rotating said first and second lead screws 44 and 44' at different velocities each other, they have different gear ratios lest the center point C of the lower roller 10 is changed, so that by the first and second lead screws 44 and 44' rotating at different velocities, either the straight- line portion of the lower roller 10 below and in correspondence with the upper roller 111 or one of the curve portions 12 and 12' on both sides is positioned in correspondence with the upper roller 111 without deviation. [7] The hot-air welder of Claim 1, wherein said pivot means 40 comprises a guide plate 41 which is installed vertically on the work table 101 on at least one side of the roller support 20 and has guide holes 42 and 42' formed in an arc shape with a predetermined interval between up and down; guide pins 21 and 21' one end of which is fixed on said roller support 20 and the other end of which is slidably inserted into said guide holes 42 and 42'; a first and second guide bars 46 and 46' which are arranged at a predetermined interval between up and down on the guide plate 41 in correspondence with said guide holes 42 and 42'; an upper moving body 50 which is slidably mounted on said first guide bar 46 and to which the middle portion of said guide pin21 is joined and which is provided with a slide guide 49 opened upward, and a lower moving body 50' which is slidably mounted on said guide pin 46 and to which the middle portion of said guide pin 21' is joined; a girdle 51 which connects said upper and lower moving bodies 50 and 50' each other; and an actuator 47 which is hinge-joined at the middle point of said girdle 51 through a rod 48 and makes said roller support 20 pivot by slide-moving said girdle 51 and said upper and lower moving bodies 50 and 50' according to forward or backward movement of said rod 48. |
Description
HOT-AIR WELDER FOR WATERPROOFING TAPE HAVING
LOWER ROLLER DRIVER
Technical Field
[1] The present invention relates to a hot-air welder for waterproofing tape which completely waterproofs a sewing line portion by heat- welding a synthetic resin tape on the sewing line portion of a product made of waterproof sheet such as a tent, raincoat, jumper, hat and ski suit, and more specifically to a hot-air welder for waterproofing tape having a lower roller driver, which enables not only selective welding of the straight-line portion and arc portion by selectively positioning the straight-line portion or curve portion formed on a lower roller in correspondence with the upper roller by a lower roller support that is pivoted through a separate pivot means, but also more speedier and convenient in the case of hot-air welding the section where the straight- line portions and arc portions are continuous.
[2]
Background Art
[3] In general, for products that need waterproofing such as a tent, raincoat, jumper, hat and ski suit, complete waterproofing is possible for the waterproof sheet, but pinholes are perforated along the sewing line in the process of sewing it. Therefore, for waterproofing of the perforated part, complete waterproofing treatment is done by affixing a synthetic resin tape to the sewing line portion by heat welding.
[4] At this time, a wide or narrow tape of synthetic resin should be used depending on the characteristics of the product or the width of the sewing line and in relation to this, the support roller also should be replaced with one with a wide or narrow width for complete waterproofing treatment of the product. But because it is not possible for a conventional tape welder to have the support roller replaced with a wide or narrow one depending on the width of synthetic resin tape, it has been used as it is. Further, an extra tape welder, such as a tape welder having a wide support roller or a tape welder having a narrow support roller, needs to be provided depending on the width of the synthetic resin tape. Because of that, using a tape welder of one kind regardless of the width of the synthetic resin has many problems such as a high rejection rate of the product or an enormous cost if different tape welders are provided according to the width of the synthetic resin tape. To solve these problems, the applicant of the present invention disclosed hot-air welders for synthetic resin in Korean Utility Model Registration Nos. 165952, 0221140 and 0221141.
[5] However, since the conventional hot-air welder for waterproofing tape has
the upper roller and lower roller made of a flat roller, it is possible to heat- weld only a straight-line shaped sewing portion with a waterproof tape. Because it is possible to transfer only in a straight- line shape due to the characteristics of the flat roller, it is possible to heat- weld only a straight-line shaped waterproof tape to the sewing portion of various products made of waterproof fabric. Therefore, it has various constraints to work in the process of heat- welding the waterproof tape to the sewing portion having various curve shapes such as a neck portion, shoulder, chest and sleeve. In order to produce products made of waterproof sheet of synthetic resin with a curved-surface shape such as a tent, raincoat, jumper, hat and ski suit, the worker makes the product by putting it in by force and rotating it along the relevant curvature by force, so creases occur in the welding portion of the waterproof tape due to overlapping of product fabric or waterproof tape, which causes the appearance to be not beautiful and lowers the marketability of the product.
[6] Accordingly, the applicant of the present invention disclosed a hot-air welder for waterproofing tape in Korea Patent Application No. 2007-057061. The hot- air welder for waterproofing tape has a lower roller driver, in which the lower roller that is in contact with the upper roller is divided into a flat roller and a taper roller, and either the flat roller or the taper roller is selectively positioned so as to be in surface contact with the upper roller, so that mutual interference between rollers is avoided and the efficiency of work is increased, and productivity is enhanced.
[7] Moreover, since it is possible to obtain an arc-shaped natural curved-lined hot-air welded portion, it is possible to waterproof the products made of waterproof sheets such as tents, raincoats, ski suits, hats and special clothing. Furthermore, since crinkling or overlapping of waterproof tapes does not occur, it is possible to form a hot-air welded portion of high quality which has an excellent watertight effect and is also smooth in the external appearance.
[8] The lower roller driver of the hot-air welder for waterproofing tape disclosed in the above patent is characterized by having the ability of selective use of flat roller and taper roller by dint of an actuator drive inside the main body, but in the case of hot-air welding of a straight- line section by flat roller or hot-air welding of an arc section by taper roller, mutual interference occurs between the flat roller and the taper roller arranged horizontally in parallel, so there is a fear of causing obstruction to work.
[9] Namely, the above-mentioned hot-air welder is configured in such a way that the flat roller or taper roller can be selectively used according to the form of the hot-air welded portion to hot-air weld the waterproof tape on the sewing lines in various kinds of waterproof products having sewing lines. But in hot-air welding the tape of a straight-line section by using flat roller, the worker s hand, product or tape in-
terferes with one side of the taper roller, so smooth and stable work is not possible.
[10] Conversely, in hot-air welding the waterproof tape on a curved- line section, the worker's hand not in use, product or tape interferes with one side of the flat roller to make work speed slow and troublesome, so workability is lowered and the hot- welded portion of the waterproof tape is not done smoothly and uniformly.
[H]
Disclosure of Invention Technical Problem
[12] To solve above mentioned problems, it is an object of the present to provide a hot-air welder for waterproofing tape having a lower roller driver, which can improve workability because it is possible to weld the straight-line portion or arc portion selectively by a single lower roller and roller support alone and continuously hot-air weld the section as well where the straight-line portions and arc portions are connectedly formed, by configuring a roller support having a lower roller so as to make direct pivot motion, and positioning the straight- line portion or curve portion formed on the lower roller selectively in correspondence with the upper roller through the pivot of the roller support.
[13]
Technical Solution
[14] To achieve the above objects, there is provided a waterproof hot-air welder having a lower roller driver according to the present invention comprises a lower roller having a straight-line portion and curve portion; a roller support for supporting the lower roller; a drive motor and power connection means for rotating the lower roller; and a forward- reverse motor and pivot means for pivoting the roller support.
[15]
Advantageous Effects
[16] By the waterproof hot-air welder having a lower roller driver according to the present invention, it is possible to selectively use the straight-line portion and curve portion of the lower roller according to the shape of the section to be hot- welded with waterproofing tape, so it is very reliable as it is possible to convert and use selectively straight-line shaped hot-air welding or arc-shaped hot-air welding as necessary. Also for the section where the straight-line portions and curve portions are continuous, it is possible to obtain natural hot-air welded portions that are continuously connected without work stop or replacement of roller. In addition, since a single lower roller is rotated to use the straight-line portion or curve portion selectively, faster and stable welding work can be done without mutual interference even during the change of straight- line section of arc section, so productivity can be improved and excellent
welding quality can be maintained. Moreover, since it is possible to obtain an arc- shaped natural curved-lined hot-air welded portion, it is possible to waterproof the products made of waterproof sheets such as tents, raincoats, ski suits, hats and special clothing. Furthermore, since crinkling or overlapping of waterproof tapes does not occur, it is possible to form a hot-air welded portion of high quality which has an excellent watertight effect and is also smooth in the external appearance. [17]
Brief Description of the Drawings
[18] Fig. 1 is a front view showing the whole of a hot-air welder according to the present invention;
[19] Fig. 2 is an exploded perspective view of the lower roller driver of the hot- air welder according to the present invention;
[20] Fig. 3 is a sectional view of the lower roller driver of the hot-air welder according to the present invention;
[21] Fig. 4 is a sectional view showing the state in which a straight- line portion of the lower roller of the hot-air welder according to the present invention is positioned below and in correspondence with the upper roller;
[22] Fig. 5 is a sectional view showing the state in which a curve portion on one side of the lower roller of the hot-air welder according to the present invention is positioned in correspondence with the upper roller;
[23] Fig. 6 is a sectional view showing the state in which a curve portion on the other side of the lower roller of the hot-air welder according to the present invention is positioned in correspondence with the upper roller; and
[24] Fig. 7 is a sectional view showing a lower roller driver of a hot-air welder according another embodiment of the present invention.
[25]
Best Mode for Carrying Out the Invention
[26] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[27] Fig. 1 is a front view showing the whole of a hot-air welder according to the present invention, Fig. 2 is an exploded perspective view of the lower roller driver of the hot- air welder according to the present invention, and Fig. 3 is a sectional view of the lower roller driver of the hot-air welder according to the present invention.
[28] As shown in the drawings, the hot-air welder for waterproofing tape according to the present invention comprises a main body 100, a work table 101 of a flat plate shape mounted on the main body 100, and a hot-air generating means 110 and an upper roller 111 arranged above the work table 101. A lower roller 10 is
arranged below the upper roller 111 by a roller support 20 protruded above the work table 101.
[29] Accordingly, when power is transmitted and various fabrics or products to be hot- welded with waterproofing tape are transferred by the rotating lower roller 10, a separately supplied waterproofing tape is melted and fused by the hot-air generating means 110 and is pressed by the upper roller 111 to make the sewing portions of various fabrics and products hot-air welded and the relevant portions waterproofed.
[30] In the present invention, by pivoting to left or right the roller support 20 mounted on the lower roller 10 at the top end, it is possible to position the straight-line portion 11 and curve portions 12 and 12' formed on the lower roller 10 selectively in correspondence with the upper roller 111. The straight-line portion 11 is used to work on the hot-air welding portion made of a straight-line section and the curve portions 12 and 12' are used to work on the hot-air welding portion made of arc sections.
[31] To describe this in more detail, both ends of the lower roller 10 according to the present invention are rotatably mounted on the roller support 20. The whole shape of the lower roller is a cylindrical ellipsoid configuration. In the central portion of the lower roller 10 is formed a straight-line portion 11 of a horizontal shape, and on both sides of the straight- line portion 11 are formed curve-shaped curve portions 12 and 12' with the center point C identical.
[32] The roller support 20 that is provided with the lower roller 10 and is stood vertically on the work table 101 can be pivoted left or right of the hot-air welder by a forward-reverse motor 30 and pivot means 40. The pivot means 40 is operatably connected to the roller support 20 so as to transfer the power from the forward-reverse motor 30 to the roller support 20.
[33] At this time, the lower roller 10 mounted on the roller support is rotated by power transmitted from the drive motor 13 underneath the work table 101 of the main body 100. Inside the roller support 20 is installed vertically a chain 14, through which power of the drive motor 13 is transmitted to the lower roller 10. The top section of the chain 14 is wound on the first sprocket 15 fixed on the rotary axis 15' and the bottom section is wound on the second sprocket 17 fixed on the rotary axis 17' At one end of the rotary axis 15' is fixed a drive gear 16 for transmitting the rotatory force of the motor transmitted through the chain 14 to the lower roller 10, and this drive gear 16 is in mesh with a driven gear 16 fixed at one end of the lower roller 10 through an idle gear.
[34] And, the rotary axis 17' on which the second sprocket 17 with the bottom section of the chain 14 wound is fixed is connected with a power axis 13' of the drive motor 13 through a universal joint 18. The universal joint 18 plays a role of transmitting the rotatory force of the motor transmitted through the power axis 13 of
the drive motor 13 to the second sprocket 17 through the rotary axis 17'.
[35] Accordingly, the rotatory force 13' of the drive motor 13 is transmitted in sequence through the power axis 13', universal joint 18, second sprocket 17, chain 14, first sprocket 15, drive gear 16, idle gear and driven gear 16' to rotate the lower roller 10 eventually.
[36] Especially, the roller support 20 are pivoted to left and right directions in some cases, and also in such a pivot condition, the rotatory force of the motor should be continuously transmitted to the lower roller 10. For this purpose, the universal joint 18 of a rectangular slit structure was adopted to enable power transmission even if the angle is changed within a predetermined range. Therefore, rotatory force is transmitted to the lower roller 10 continuously from the drive motor 13 irrespective of the angle and length within a predetermined range to make continuous work possible.
[37] As described above, the lower roller 10 is composed of the straight-line portion 11, and curve portions 12 and 12' formed on both sides of the straight- line portion 11, so hot welding of the straight- line section or curve section becomes possible through selective use of these portions. These straight-line portion 11 and curve portions 12 and 12' can be shifted to a use position through the pivot of the roller support 20 that is supporting the lower roller 10.
[38] For this purpose, the roller support 10 can make pivot motion to the left or right of the center point C of the lower roller 10. As guide pins 21 and 21' protruded on both sides of the roller support 20 are moved along guide holes 42 and 42' formed on the guide plate 41, the roller support 20 is pivoted left and right with reference to the center point C of the lower roller 10.
[39] To describe this in more detail, on both sides of the roller support 20 are installed the guide plates 41 fixed underneath the work table 101, and on the guide plates 41 are formed guide holes 42 and 42' that are penetrated with an interval between up and down. In these guide holes 42 and 42' are inserted respectively guide pins 21 and 21' protruded on both sides of the roller support 20.
[40] And, on at least one guide plate 41 are arranged two lead screws 44 and 44' with a predetermined interval between up and down, and on these lead screws 44 and 44' are screw-joined with screw guides 43 and 43'. During assembly, guide pins 21 and 21' pass through these screw guides 43 and 43' before they are inserted into guide holes 42 and 42'. It is preferable that the guide pins 21 and 21' are joined with the screw guides 43 and 43' by an element such as a hinge pin. When the first lead screw 44 and second lead screw 44' rotate, the screw guides 43 and 43' are moved left or right along the screw-joined lead screws 44 and 44'. Thus, the guide pins 21 and 21' also are moved left or right along the trajectory of the guide holes 42 and 42' by the lead screws 44 and 44', so that the roller support 20 that is monolithically made of the guide pins
21 and 21' is pivoted left or right.
[41] The first lead screw 44 and the second lead screw 44' are operatably connected with the forward-reverse motor 30 through a plurality of gears. At one end of these first lead screw 44 and second lead screw 44' are joined a plurality of transmission gears 45 and 45', so the rotatory force of the forward-reverse motor 30 is transmitted to the first and second lead screws 44 and 44' through these transmission gears 45 and 45'.
[42] Accordingly, when the forward-reverse motor 30 rotates, the rotatory force of the motor 30 is transmitted to the first and second lead screws 44 and 44' through the transmission gears 45 and 45' and then transmitted to the roller support 20 through the screw guides 43 and 43' and the guide pins 21 and 21' that are screw-joined to the first and second lead screws 44 and 44'. At this time, it is necessary to adjust the gear ratio of the transmission gears 45 and 45' so that the first and second lead screws 44 and 44' have different rotation velocities each other.
[43] In other words, because the upper guide pin 21 operating by the first lead screw 44 and the lower guide pin operating by the second screw 44' have different lengths from the center point C of the curve portions 12 and 12' of the lower roller 10, the position of the center point C will change unless these guide pins 21 and 21' are rotated at different velocities each other when the roller support 20 is pivoted. By adjusting the RPM ratio of transmission gears 45 and 45' like this, it is possible to configure the rotation velocities of lead screws differently. Accordingly, the roller support 20 can make pivot motion left or right of the center point C smoothly without change of the center point C.
[44] If the roller support 20 pivots like this, as shown in Figs 4 to 6, either the straight- line portion 11 or one of the curve portions 12 and 12 on both of the sides is positioned in correspondence with the upper roller 111. That is, according to forward rotation or reverse rotation of the forward-reverse motor 30, either the straight- line portion 11 or one of the curve portions 12 and 12' is positioned below the upper roller 111.
[45] Thus, if the straight-line portion 11 of the lower roller 10 is positioned below and in correspondence with the upper roller 111, it is possible to work on hot-air welding of the straight- line sections of various fabrics and products, and if either one of the curve portions 12 and 12' on both sides of the lower roller 10 is positioned in correspondence with the upper roller 111, it is possible to work on hot-air welding of the arc sections.
[46] Namely, the curve portions 12 and 12' play a role like a taper roller, so if fabric or a product moves with the curve portion 12 or 12' positioned in correspondence with the upper roller 111, the curve portion 12 or 12' that has a diameter
gradually reducing toward outside from the straight- line portion 11 of the lower roller 10 has the rotation velocities different between the central portion and the end portion. Therefore, the fabric or product is moved in an arc shape by the difference of the rotation velocities, so eventually the arc-shaped sewing portion can be effectively waterproofed.
[47] Accordingly, as well as waterproofing the simple straight-line section or arc section, the case of straight-line portions and arc portions being continuously arranged can be effectively and easily waterproofed by rotating the roller support 20 in correspondence.
[48] Fig. 7 shows a lower roller driver of hot-air welder according to another embodiment of the present invention, and a different pivot means is shown. In this embodiment, other than the structure for pivoting the roller support 20 by using a bar- shaped guide bar and actuator instead of lead screws, it is roughly the same as the embodiment described above. Therefore, to avoid repetitive description, it will be described centering on a different structure excluding identical portions.
[49] For the pivot of the lower roller 10, a guide plate 41 is fixed vertically on the work table 101 on at least one side of the roller support 20, and arc-shaped guide holes 42 and 42' are formed through the guide plates 41 with a predetermined interval between up and down, and then guide pins 21 and 21' protruded on the roller support 20 are inserted into the guide holes 42 and 42'. Since the trajectory of the pivot motion of the roller support 20 increases in proportion to the length thereof, the pivot motion range of the lower guide pin 21' is larger than that of the upper guide pin 21. Accordingly, the length of the lower guide hole 42' nto which the lower guide pin 21' is inserted is formed longer than that of the upper guide hole 42 into which the upper guide pin 21 is inserted.
[50] The first guide bar 46 and second guide bar 46 which are separated up and down are formed on one side of the guide plate 41, and upper and lower moving bodies 50 and 50' are inserted into the outer circumference of the first and second guide bars 46 and 46'. The upper moving body 50 is provided with a slide guide 49 with the upper guide pin 21 opened upward so as to join the moving body 50 and the guide pin 21 each other. These upper and lower moving bodies 50 and 50 are connected each other by a girdle 51, and at the middle point of the girdle 51 is joined the rod 48 of the actuator 47 by a hinge pin.
[51] During operation, when the rod 48 is advanced by operation of the actuator
47, the advancing force is transmitted to the upper and lower moving bodies 50 and 50' through the rod 48 and girdle 51, and the upper and lower moving bodies 50 and 50' advance while slide-moving along the first guide bar 46 and second guide bar 46'.
[52] At this time, the upper moving body 50 is joined with the upper guide pin
21 of the roller support 20 through the slide guide 49, so when the upper moving body 50 advances, the upper guide pin 21 moves along the upper guide hole 42 on the arc by the slide guide 49. Simultaneously, the lower guide pin 21' is slide-moved along the lower guide hole 42' on the arc, so the roller support 20 makes pivot motion to left or right more stably.
[53] Also in the case of backward operation of the actuator 47, as described above, the backward force of the actuator 47 is transmitted through the rod 48 and girdle 51 to the upper and lower moving bodies 50 and 50' to move these backward, and at the same time, the upper moving body 50 that slide-moves along the upper guide bar 46 moves the upper guide 21 backward through the slide guide 49, while the lower guide pin 21' slide-moves along the lower guide hole 42', so that the roller support 20 can make pivot motion in the direction opposite to as described above.
[54]
Industrial Applicability
[55] By the waterproof hot-air welder having a lower roller driver according to the present invention, it is possible to selectively use the straight-line portion and curve portion of the lower roller according to the shape of the section to be hot- welded with waterproofing tape, so it is very reliable as it is possible to convert and use selectively straight-line shaped hot-air welding or arc-shaped hot-air welding as necessary. Also for the section where the straight-line portions and curve portions are continuous, it is possible to obtain natural hot-air welded portions that are continuously connected without work stop or replacement of roller.
[56]
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