JP2012075449A - Sewing machine table and sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine table and a sewing machine, which can promote cooling of a heating component used for driving control for a sewing machine main body.SOLUTION: The sewing machine comprises: a heating component 330 used for driving control for a sewing machine main body 100 and disposed on a right end side of a second lower surface 202 of an under-cover 200; and a notch 12 formed on a side corresponding to the right end side of an opening 10 of a sewing machine table 20. The notch 12 forms a heat radiation hole H, which is not closed by the sewing machine main body 100 and the under-cover 200, on a side of the heating component 330 of the under-cover 200 at the opening 10 of the sewing machine table 20.

Description

  The present invention relates to a sewing machine table and a sewing machine in which heat-generating components used for drive control of the sewing machine body are arranged below the sewing machine table.

  Conventionally, there has been known a sewing machine in which a circuit board and a heat generating component used for driving control of a sewing machine body are arranged below a sewing machine table (see, for example, Patent Document 1).

  In this conventional sewing machine, a sewing machine main body is installed in an opening portion of the sewing machine table, and an under cover is provided to cover a lower portion of the sewing machine main body. A control box is provided on the lower surface of the sewing machine table. A frame extends vertically in the control box, and circuit boards and heat generating components are attached to the left and right sides of the frame. Ventilation holes are provided above and below the control box to cool the heat generating components.

JP 2000-388 (FIGS. 4 and 6)

  When the heat generating component generates heat, the conventional sewing machine generates natural convection from below through the vents provided at the top and bottom of the control box, and the heat generating component is cooled by this convection.

  However, since the sewing machine of the prior art has a sewing machine table close to the upper part of the control box, only a small space can be secured above the vent hole provided in the upper part of the control box. Therefore, even if the sewing machine is provided with vent holes above and below the control box, it cannot be said that sufficient convection occurs, and it cannot be said that the heat-generating component can be sufficiently cooled.

  An object of the present invention is to provide a sewing machine table and a sewing machine that can promote cooling of a heat generating component used for drive control of the sewing machine body.

  In order to achieve the above object, the sewing machine table according to the first aspect of the invention is a sewing machine table in which a sewing machine main body can be installed and an opening in which a metal under cover covering the lower part of the sewing machine main body can be disposed is formed. Is provided with a notch on the side where the heat generating component is arranged when the under cover for arranging the heat generating component used for driving control of the sewing machine body is attached to the sewing machine table.

  In the first invention of the present application, the sewing table can be provided with an under cover in the opening. The undercover is provided with heat generating components used for drive control of the sewing machine body. The opening has a notch on the side where the heat generating component is arranged when the under cover is attached to the sewing machine table. Therefore, the notch can sufficiently generate natural convection from below to above due to heat generation from the heat generating component. Therefore, the sewing table can promote the cooling of the heat generating component by the notch.

  In order to achieve the above object, the sewing machine of the second invention is provided in a sewing machine table having an opening, a sewing machine body installed in the opening part of the sewing machine table, and the opening part of the sewing machine table, A metal under cover that covers a lower portion of the sewing machine main body, and a heat generating component that is disposed on one end of the lower surface of the under cover and is used for drive control of the sewing machine main body, and the sewing machine table has the opening The under cover is provided with a notch on a side corresponding to the one end side.

  In the second invention of the present application, a heat generating component used for drive control of the sewing machine body is arranged on one end side of the lower surface of the under cover, and a notch is provided on the side corresponding to the one end side of the opening of the sewing machine table. The notch portion can form a heat radiation hole that is not blocked by the sewing machine main body and the under cover on the heat generating component side of the under cover at the opening of the sewing machine table. Therefore, the sewing machine can sufficiently generate natural convection from below to above due to heat generation on the heat generating component side of the undercover. Therefore, the sewing machine can promote the cooling of the heat generating component.

  A sewing machine according to a third aspect of the invention is characterized in that, in the second aspect of the invention, a circuit board used for driving control of the sewing machine body is arranged on a side different from the one end side of the lower surface of the under cover.

  In the third invention of the present application, since the circuit board can be arranged on a side different from the heat generating component side, the circuit board can be protected from the heat of the heat generating component.

  A sewing machine according to a fourth aspect of the present invention is the sewing machine according to the second or third aspect, wherein the sewing machine main body includes a pedestal portion standing from the sewing machine table and an arm portion extending leftward from an upper portion of the pedestal portion. And the heat generating component is disposed on one end side of the lower surface of the under cover corresponding to the leg column side of the sewing machine body, and the notch is the leg column part of the sewing machine body of the opening. It is provided on the side corresponding to the side.

  In the sewing work, the work cloth is moved back and forth in an area below the arm of the sewing machine body (hereinafter referred to as “working area”) on the sewing machine table. For this reason, when the notch part which is not obstruct | occluded with a sewing machine main body and an under cover is located in the said work area, the catch of a work cloth, etc. may arise.

  In the fourth invention of the present application, the notch portion is provided on one end side that is the pedestal side of the opening. Therefore, the notch portion can be provided at a position spaced from the work area with the pedestal portion interposed therebetween. Therefore, the sewing machine can prevent the work cloth from being caught.

  Also, since the worker is located on the work area side, the heat generating component can be arranged on the side opposite to the worker side by arranging the heat generating component on one end side corresponding to the pedestal side on the lower surface of the under cover. it can. Therefore, the sewing machine can prevent the heat-generating component from coming into contact with the operator's legs and the like, and can improve the safety of the operator.

  A sewing machine according to a fifth aspect of the present invention is the sewing machine according to any one of the second to fourth aspects, wherein the heat generating component is provided so as to contact a lower surface of the under cover.

  As a result, the sewing machine can efficiently dissipate heat generated by the heat generating component by transferring the heat to the under cover.

  A sewing machine according to a sixth aspect of the present invention is characterized in that, in any of the second to fifth aspects of the invention, the heat generating component is a regenerative resistor.

  The sewing machine is provided with a regenerative resistor for consuming electric power generated when the sewing machine motor is regeneratively operated to apply a brake. This regenerative resistor is a heat generating component having the largest heat generating action among components used for drive control of the sewing machine main body.

  According to the sixth aspect of the present invention, the regenerative resistor generating a large amount of heat is arranged on one end side of the lower surface of the under cover, and the notch is provided on the side corresponding to the one end side of the opening of the sewing machine table. Therefore, the sewing machine can sufficiently generate natural convection from below to above due to heat generated by the regenerative resistor, and can promote cooling of the regenerative resistor.

  ADVANTAGE OF THE INVENTION According to this invention, cooling of the heat-emitting component used for drive control of a sewing machine main body can be accelerated | stimulated.

It is a front view showing the schematic structure of a sewing machine. It is the perspective view which looked at the sewing machine table, the under cover, and the circuit board from the front side diagonally downward. It is a front view of an undercover and a circuit board. It is a bottom view of the under cover showing the arrangement configuration of a circuit board. It is the perspective view seen from the diagonally upper direction showing the internal structure of an undercover. It is the perspective view seen from the diagonally downward direction showing the lower surface structure of an undercover. FIG. 4 is a cross-sectional view in the direction of the arrows along the line VII-VII in FIG. 3. It is arrow direction sectional drawing in the VIII-VIII line of FIG. It is a side view from the left direction showing the state which the substrate cover covered the circuit board. It is a side view from the left direction showing the state which the board | substrate cover opened. It is the perspective view seen from the diagonally upper direction showing the bearing structure of a switch lever. It is a side view from the left direction showing the fixation structure of the link mechanism which concerns on a pedal. It is a figure equivalent to FIG. 7 in the modification which provided the uneven | corrugated part for heat dissipation in the side surface of the undercover. FIG. 8 is a view corresponding to FIG. 7 in a modification in which a substrate is vertically arranged on the lower surface of the under cover.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the front side of the sheet of FIG. 1 is the front of the sewing machine 1 that faces the operator.

  A schematic structure of the sewing machine 1 will be described with reference to FIG.

  As shown in FIG. 1, the sewing machine 1 is provided with a sewing table 20 having an opening 10, a sewing machine main body 100 installed in the opening 10 of the sewing table 20 from above, and an opening 10 in the sewing table 20 from below. A metal under cover 200 that covers the lower part of the sewing machine main body 100 and a circuit board 300 (see FIG. 2) provided on the under cover 200 and used for driving control of the sewing machine main body 100 are included. FIG. 1 shows a state where the circuit board 300 is covered with the board cover 400.

  The sewing machine main body 100 includes a bed 101, a pedestal column portion 102 erected on the right side of the bed 101, and an arm portion 103 extending leftward from the upper portion of the pedestal column portion 102. The sewing machine body 100 incorporates a sewing machine motor (not shown). The arm portion 103 includes a needle bar 105 that reciprocates up and down based on driving of the sewing machine motor on the left side. The needle bar 105 has a sewing needle 106 attached to the lower end thereof. A thread spool (not shown) which is an upper thread supply source supplies an upper thread to the sewing needle 106. The sewing machine main body 100 is provided with a thread tension device 107 that adjusts the tension of the upper thread on the left front surface of the arm portion 103. The sewing machine main body 100 includes a cover 108 that covers the sewing machine motor on the right side surface of the pedestal 102. The bed 101 includes a thread trimming mechanism (not shown), a rotary hook (not shown), and the like, and a bobbin around which a lower thread is wound is detachably mounted on the rotary hook.

  Below the sewing machine table 20, a pedal 30 is provided for changing the rotational speed of the sewing machine motor built in the sewing machine body 100 in accordance with the amount of depression. When the pedal 30 is operated, the connecting rod 31 connected to the pedal 30 moves up and down, and the up and down movement of the connecting rod 31 is performed via a link mechanism 40 (see FIG. 12 to be described later). 12).

  A switch lever 50 for switching the vertical position of a cloth presser (not shown) provided in the sewing machine body 100 is provided below the sewing machine table 20. The switch lever 50 is rotatable around a rotation shaft 51 provided through the front side surface 252 of the under cover 200, and the operator rotates the switch lever 50 with a knee. It is possible to switch the vertical position of the cloth presser.

  Next, the circuit board 300 will be described with reference to FIGS. In all the drawings, the sewing machine main body 100, the substrate cover 400, and the switch lever 50 are not shown.

  As shown in FIGS. 2 to 4, a circuit board 300 is disposed on the lower surface of the under cover 200. Specifically, the lower surface of the under cover 200 includes a first lower surface 201 that is in a low position when attached to the sewing machine table 20, and a second lower surface 202 that is in a higher position than the first lower surface, The circuit board 300 is horizontally disposed on the second lower surface 202. The term “horizontal” means that a substrate surface on which control elements 312 and 322 of substrates 311 and 321 described later are disposed is substantially parallel to the second lower surface 202.

  As the circuit board 300, a control circuit board 310 and a power circuit board 320 are provided. The circuit boards 310 and 320 are printed wiring boards, and are configured by mounting a plurality of control elements 312 and 322 such as integrated circuits, resistors, and capacitors on the boards 311 and 321 on which wiring patterns are formed by printing. A large number of control elements 322 having a thickness (a thickness in the vertical direction; the same applies hereinafter) larger than that of the control circuit board 310 are mounted on the power supply circuit board 320. Therefore, the power supply circuit board 320 is thicker than the control circuit board 310 as a whole. The control circuit board 310 is arranged on the left side (one side in the left-right direction) which is the operator side on the second lower surface 202. The power supply circuit board 320 is arranged on the right side (the other side in the left-right direction) opposite to the worker side on the second lower surface 202.

  As shown in FIG. 3, the control element 312 mounted on the substrate 311 of the control circuit board 310 includes a plurality of first control elements 313 having a thickness from the substrate 311 smaller than a predetermined thickness To, and a predetermined thickness To. A plurality of second control elements 314 that are larger than the second control element 314 are included. In the control circuit board 310, the first control elements 313 are intensively arranged on the left side (one side in the left-right direction) which is the worker side. The control circuit board 310 is intensively arranged on the right side (the other side in the left-right direction) where the second control element 314 is opposite to the worker side.

  In the present embodiment, the circuit board 300 is composed of two boards, that is, the control circuit board 310 and the power circuit board 320. However, the circuit board 300 may be composed of one board having these functions as one, or three or more. You may comprise with the board | substrate of. In the control circuit board 310, the first control element 313 having a small thickness and the second control element 314 having a large thickness are arranged on one side and the other side in the left-right direction, but the first control element is similarly applied to the power circuit board 320. And the second control element may be arranged on one side and the other side in the left-right direction.

  As shown in FIGS. 3 and 4, the control circuit board 310 includes a heating element 315 at a substantially central position in the left-right direction on the back side (upper side in FIG. 3) of the board 311. As an example of the heat generating element 315, there is an IPM (intelligent power module), for example.

  The control circuit board 310 and the power circuit board 320 are spaced from the second lower surface 202 by a predetermined gap via a plurality of ribs 203 (see FIG. 3 or FIG. 6 described later) formed on the second lower surface 202 of the under cover 200. And arranged opposite to each other.

  On the other hand, a heat generating component 330 used for drive control of the sewing machine main body 100 is provided on the right end side (one end side) of the second lower surface 202 of the under cover 200. The heat generating component 330 is provided so as to be in direct contact with the second lower surface 202 of the under cover 200 by, for example, an adhesive. An example of the heat generating component 330 is a regenerative resistor for consuming electric power generated when the sewing machine motor is regeneratively operated and brakes are applied. The regenerative resistor is a heat generating component having the largest heat generating action among components used for drive control of the sewing machine main body 100. The control circuit board 310 and the power circuit board 320 are disposed on a different side from the right end side (one end side) of the second lower surface 202 of the under cover 200.

  Next, the notch structure in the opening 10 of the sewing machine table 20 will be described with reference to FIGS. 1 and 2 described above.

  As shown in FIGS. 1 and 2, the opening 10 of the sewing machine table 20 is notched in one end side corresponding to the position where the heat generating component 330 is disposed in the under cover 200, that is, the inner peripheral surface 11 r on the right end side. Part 12 is formed. The notch 12 is formed in a concave shape toward the right at a substantially central position in the front-rear direction of the inner peripheral surface 11r. The notch 12 has the following functions.

  The sewing machine table 20 is provided with the sewing machine main body 100 in the opening 10 from the upper side and an under cover 200 for covering the lower part of the sewing machine main body 100 from the lower side. Thereby, the opening 10 of the sewing machine table 20 is closed by the sewing machine body 100 and the under cover 200. As shown in FIG. 2, the notch 12 can form a heat radiation hole H that is not blocked by the sewing machine body 100 and the under cover 200. As shown in FIG. 1, the cover 108 of the sewing machine main body 100 has a shape protruding above the heat radiation hole H, but a gap S is secured at the lower portion so that the heat radiation hole H is not blocked. ing. Therefore, the notch 12 can sufficiently generate natural convection from the lower side to the upper side due to heat generation through the sewing machine table 20 on the heat generating component 330 side of the under cover 200. Cooling can be promoted.

  The notch 12 is not necessarily provided on the right end side of the opening 10. For example, when the heat generating component 330 is provided on the rear end side of the under cover 200, the notch may be provided on the rear end side of the opening 10, and on the side corresponding to the arrangement position of the heat generating component 330 in the under cover 200. I just need it. The position on the right end side is preferable for the following reason. That is, in the sewing work, the work cloth is moved back and forth in the area below the arm portion 103 on the sewing machine table 20 (hereinafter referred to as “work area”). When the notch 12 that is not blocked by the sewing machine main body 100 is located in the work area, the work cloth is caught. In contrast, when the notch 12 is provided on the right end side of the opening 10, that is, on the side of the leg column 102 in the sewing machine main body 100 as described above, the notch 12 is sandwiched from the work area to the leg column 102. And can be provided at positions separated from each other. Therefore, the cutout portion 12 does not catch the work cloth. Further, since the worker is located on the work area side, the heat generating component 330 can be disposed on the right end side of the under cover 200 opposite to the worker side, and the heat generating component contacts the operator's leg or the like. It is possible to improve the safety of workers.

  Note that the shape and size of the notch 12 are not limited to those shown in FIG. 2, and may be appropriately set according to, for example, the shape, size, and heat generation amount of the heat generating component 330.

  Next, the structure of the undercover 200 will be described with reference to FIGS.

  As shown in FIGS. 5 and 6, the under cover 200 has a box-like shape with an upper portion opened in a substantially rectangular shape. Hereinafter, the upper opening of the under cover 200 is referred to as a cover opening 205. As shown in FIGS. 1, 5, and 6, the under cover 200 includes a first cover part 210 that is located on the lower left side of the arm part 103, and a first cover part 210 that is connected to the first cover part 210 and reaches the lower part of the leg pillar part 102. 2 cover portion 220. The first cover part 210 has a deeper structure than the second cover part 220 in order to accommodate a drive mechanism such as a rotary hook. Therefore, when the under cover 200 is attached to the sewing machine table 20, the first lower surface 201 of the first cover portion 210 is positioned lower than the second lower surface 202 of the second cover portion 220.

  The under cover 200 functions as a cover that covers the lower part of the sewing machine body 100 through the opening 10 of the sewing machine table 20. The 1st cover part 210 also functions as an oil pan which receives the oil which is supplied to a rotary hook and is scattered by rotation of a rotary hook. Therefore, a partition wall 230 that prevents oil received by the first cover part 210 from entering the second cover part 220 side is provided inside the under cover 200. The first cover part 210 has an opening 211 required for maintenance work such as replacement of a bobbin in which a lower thread is wound around a rotary hook from the left end side surface 253 to the first lower surface 201.

  The height relationship between the first lower surface 201 and the second lower surface 202 is set as follows. As shown in FIG. 3, when the control circuit board 310 and the power circuit board 320 are arranged on the second lower surface 202 via the rib 203, the height of the substrates 311 and 321 is higher than the first lower surface 201 by the height h. It is set to be a position. The height of the rib 203 is set to be lower than the height difference between the first lower surface 201 and the second lower surface 202. Since the height of the substrates 311 and 321 is higher than that of the first lower surface 201, it is possible to prevent oil that hangs downward from the opening 211 from entering the first lower surface 201 and adhering to the control circuit substrate 310.

  As shown in FIG. 6, the second lower surface 202 is provided with a projecting wall 204 projecting downward so as to surround the periphery of the control circuit board 310 and the power supply circuit board 320 arranged horizontally. The protruding wall 204 has the following functions. For example, when an operator spills liquid such as drinking water on the upper surface of the sewing machine table 20, the liquid is transmitted from the inner peripheral surface 11 (see FIGS. 7 and 8) of the opening 10 of the sewing machine table 20 to the side surface of the under cover 200. , May hang down. In this case, when the liquid goes around the second lower surface 202 of the under cover 200 and adheres to the control circuit board 310 and the power supply circuit board 320, the circuit formed on the boards 311 and 321 and the control elements 312 and 322 are corroded. The protruding wall 204 prevents the liquid dripping from the side surface of the under cover 200 from flowing into the second lower surface 202, and prevents the liquid from adhering to the control circuit board 310 and the power supply circuit board 320.

  As shown in FIG. 6, the protruding wall 204 is provided so as to surround the periphery of the circuit board 300 except for the first lower surface 201 side. The protruding walls 204 are not provided at both ends in the left-right direction on the front side of the second lower surface 202. About the both ends of the left-right direction of the front side of the 2nd lower surface 202, it prevents that a liquid wraps around the 2nd lower surface 202 by the bearing part 207 and the axial part 402 (refer FIG. 9) of the board | substrate cover 400 mentioned later. On the first lower surface 201 side, the height of the substrates 311 and 321 is higher than that of the first lower surface 201, so that the liquid that has entered the first lower surface 201 can be prevented from adhering to the control circuit substrate 310. Liquid that hangs down the front side surface 252, the right side surface 255, and the rear side surface 251 of the undercover 200 by the protruding walls 204 provided in the three directions of the front side, the right side, and the rear side of the control circuit board 310 and the power circuit board 320. Can be prevented from entering the second lower surface 202.

  As shown in FIGS. 7 and 8, the protruding wall 204 has the shape of the upper edge portion 401 of the substrate cover 400 so as to be close to the periphery of the upper edge portion 401 of the substrate cover 400 when the substrate cover 400 is closed. It is provided along. As shown in enlarged views in FIGS. 7 and 8, when the substrate cover 400 is closed, a labyrinth structure LS is formed between the protruding wall 204 provided on the second lower surface 202 and the upper edge 401 of the substrate cover 400. . Therefore, the liquid outside the substrate cover (for example, the liquid that hangs down the front side surface 252, the right side surface 255, and the rear side surface 251 of the under cover 200) does not flow to the circuit board 300 side.

  The cover opening 205 of the under cover 200 has an area (opening area; the same applies hereinafter) larger than the area of the opening 10 of the sewing machine table 20. The opening 10 of the sewing table 20 and the cover opening 205 of the under cover 200 both have a substantially rectangular shape, and the long side Lc2 (length in the left-right direction) of the cover opening 205 is the long side Lh2 of the opening 10 of the sewing table 20. Longer than (horizontal length). The length Lc1 of the short side (length in the front-rear direction) of the cover opening 205 is longer than the length Lh1 of the short side (length in the front-rear direction) of the opening 10 of the sewing machine table 20. Therefore, the edge portion 206 of the cover opening 205 is located on the outer peripheral side of the edge portion 13 d of the sewing table 20 below the opening 10. The opening 10 corresponds to the table opening described in the claims.

  As shown in FIGS. 5 and 6, the under cover 200 includes bolt mounting portions 256 formed in a concave shape so as to allow a fixing bolt (not shown) to pass therethrough at four corners. As shown in FIGS. 7 and 8, a recess 22 is formed on the lower surface 21 of the sewing machine table 20 in a substantially rectangular frame shape along the lower edge 13 d of the opening 10. Bolt holes (not shown) are formed in the recesses 22 at positions corresponding to the bolt mounting portions 256. The under cover 200 is attached to the sewing machine table 20 by fastening the fixing bolts inserted through the respective bolt mounting portions 256 to the bolt holes of the concave portions 22 with the edge portions 206 of the cover openings 205 in contact with the concave portions 22. It is attached.

  As shown in FIGS. 3 and 6, the second lower surface 202 of the under cover 200 is provided with a heating element contact portion 240 protruding downward at a position corresponding to the heating element 315 of the control circuit board 310 described above. Yes. The heating element contact portion 240 includes a flat surface 241 that contacts the heating element 315 provided on the back side (upper side in FIG. 3) of the control circuit board 310 at the lower end. The flat surface 241 of the heating element contact portion 240 is formed by, for example, slightly thickening the undercover 200 when casting, and then polishing the end surface. The heating element contact portion 240 is made of the same metal material (aluminum or the like) having the same thermal conductivity as the under cover 200. Therefore, the heating element contact portion 240 secures a heat transfer area with the heating element 315 of the control circuit board 310 by the flat surface 241 and efficiently transfers the heat generated by the heating element 315 to the under cover 200 to radiate heat. be able to.

  Next, the structure of the substrate cover 400 will be described with reference to FIGS.

  The substrate cover 400 is a cover that protects the control circuit board 310 and the power supply circuit board 320 that are horizontally arranged on the second lower surface 202. The substrate cover 400 includes two shaft portions 402 projecting outward in the left-right direction at the front end (right side in FIGS. 9 and 10). As shown in FIG. 6, the under cover 200 is provided with two bearing portions 207 that rotatably support the shaft portion 402 at the front side end portion of the second lower surface 202. The substrate cover 400 is rotatable about the shaft portion 402 with respect to the second lower surface 202 of the under cover 200.

  As shown in FIG. 9, in the normal state, the substrate cover 400 has its upper edge 401 (see FIG. 10) brought into contact with the second lower surface 202 within the enclosure of the protruding wall 204 of the under cover 200, thereby cover. Therefore, the board cover 400 prevents foreign matter such as dust from adhering to the circuit board 300 and contact of the operator's legs. As shown in FIG. 1, the first lower surface 201 of the under cover 200 is not covered by the substrate cover 400. As shown in FIG. 10, when performing maintenance work such as replacement of the circuit board 300, the board cover 400 rotates about the shaft portion 402, and the rear side (the left side in FIG. 10) of the circuit board 300 is exposed. The substrate cover 400 rotates so as to close the front side (right side in FIG. 10) which is the worker side.

  Next, the bearing structure of the switch lever 50 will be described with reference to FIG.

  As shown in FIG. 11, two bearings 52, 52 that support the rotary shaft 51 of the switch lever 50 described above are provided inside the second cover portion 220 of the under cover 200 (see also FIG. 5). The rotating shaft 51 that is pivotally supported by the bearings 52, 52 passes through a shaft hole 254 (see FIGS. 3, 5, and 6) provided in the front side surface 252 of the undercover 200, and is switched on the front side of the undercover 200. The lever 50 is connected to the arm member 53 via a connector 54. The rotating shaft 51 is connected to a cloth pressing drive mechanism (not shown) via a connecting member 55 and a connecting mechanism (not shown), and the rotation operation of the rotating shaft 51 is transmitted to the cloth pressing drive mechanism. Therefore, the operator can perform the switching operation of the vertical position of the cloth presser by rotating the switch lever 50 with the knee.

  Next, the link mechanism 40 of the pedal 30 will be described with reference to FIG.

  Below the sewing machine table 20, a pedal 30 (see FIG. 1) is provided for changing the rotation speed of the sewing machine motor built in the sewing machine body 100 in accordance with the amount of depression. The vertical movement of the pedal 30 is input to the pedal sensor 32 via the connecting rod 31 and a link mechanism 40 including a plurality of link members. The pedal sensor 32 is provided on the rear side surface 251 of the under cover 200. The link mechanism 40 is provided on the rear side surface 251 of the under cover 200 via the pedal sensor 32.

  In the sewing machine 1 according to the embodiment described above, the sewing machine body 100 is installed on the opening portion of the sewing machine table 20 from the upper side, and the under cover 200 that covers the lower part of the sewing machine body 100 from the lower side is provided. Is closed by the sewing machine main body 100 and the under cover 200. In the under cover 200, a heat generating component 330 used for driving control of the sewing machine body 100 is disposed on the right end side of the second lower surface 202. The sewing machine table 20 is provided with a notch 12 on the right end side of the opening 10. The notch 12 can form a heat radiation hole H that is not blocked by the sewing machine main body 100 and the under cover 200 on the heat generating component 330 side of the under cover 200 in the opening 10 of the sewing machine table 20. Therefore, the sewing machine table 20 can sufficiently generate natural convection from the lower side to the upper side due to heat generation on the heat generating component 330 side of the under cover 200, so that cooling of the heat generating component 330 can be promoted.

  In particular, in the present embodiment, the under cover 200 has the circuit board 300 used for driving control of the sewing machine body 100 on the side different from the one end side of the second lower surface 202, so the circuit board is on the side different from the heat generating component 330 side. 300 can be arranged. Therefore, the sewing machine 1 can protect the circuit board 300 from the heat of the heat generating component 330.

  Particularly in the present embodiment, the sewing machine table 20 is provided with the notch portion 12 on the right end side of the opening 10 that is the pedestal portion 102 side. Therefore, since the notch part 12 can be provided in the position spaced apart from the above-mentioned work area on both sides of the pillar part 102, the sewing machine table 20 can prevent the work cloth from being caught by the notch part 12. . Further, since the worker is located on the work area side, the heat generating component 330 can be disposed on the side opposite to the worker side by arranging the heat generating component 330 on the right end side. Therefore, it can prevent that the heat-emitting component 330 contacts a worker's leg etc., and can improve a worker's safety.

  In the present embodiment, in particular, the heat generating component 330 is provided so as to contact the second lower surface 202 of the under cover 200. Accordingly, the sewing machine 1 can efficiently dissipate heat generated by the heat generating component 330 by transferring the heat to the under cover 200 efficiently.

  Particularly in the present embodiment, the sewing machine 1 is provided with a regenerative resistor as the heat generating component 330. In the sewing machine 1, a regenerative resistor that generates a large amount of heat is disposed on the right end side of the second lower surface 202 of the under cover 200, and the notch 12 is provided on the right end side of the opening 10 of the sewing machine table 20. Therefore, the sewing machine 1 can sufficiently generate natural convection from below to above due to the heat generated by the regenerative resistor, and can promote the cooling of the regenerative resistor.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and technical idea of the present invention.

(1) In the case where an uneven portion for heat dissipation is provided on the side surface of the under cover For example, as shown in FIG. 13, the heat from the circuit board 300 is applied to the side surface of the under cover 200 (the rear side surface 251 in the example shown in the figure). An uneven portion for heat dissipation 257 for dissipating heat may be provided. As described above, the heat generated in the heat generating element 315 of the control circuit board 310 and the heat generated in the heat generating component 330 are transferred to the under cover 200. Since the heat radiation uneven portion 257 is provided on the side surface, the heat radiation area is increased and heat can be efficiently radiated. In addition, the uneven | corrugated | grooved part 257 for heat radiation may be provided in all the side surfaces 251,252,253,255 of the undercover 200, and may be provided only in any one side surface. The heat radiating uneven portion 257 may be provided only in a partial region rather than all of the side surfaces.

(2) In the case where the substrate is arranged vertically on the lower surface of the under cover In the above embodiment, the surface on which the circuit boards 310 and 320 are mounted on the substrates 311 and 321 and the control elements 312 and 322 are mounted is parallel to the second lower surface 202. It arranged so that it might become. The surface on which the control elements 312 and 322 are mounted may be arranged to be perpendicular to the second lower surface 202. The structure of this modification will be described with reference to FIG.

  As shown in FIG. 14, the under cover 200 has a frame 500 suspended from the second lower surface 202 along a direction substantially perpendicular to the second lower surface 202 (substantially vertical up and down direction). The control circuit board 310 and the power circuit board 320 constituting the circuit board 300 are arranged on the front side (left side in FIG. 14) of the frame 500 through a plurality of ribs 501 formed on the frame 500. The substrate cover 400A is formed to be larger in the vertical direction than the substrate cover 400 of the above-described embodiment so as to cover the circuit substrate 300 arranged vertically to the second lower surface 202.

  Also in this modified example, the under cover 200 is provided with the protruding wall 204 on the second lower surface 202 so as to surround the circuit board 300, so that liquid such as drinking water is prevented from entering the circuit board 300 side. can do. In the example shown in FIG. 14, the circuit board 300 is provided on the front side of the frame 500, but may be provided on the rear side of the frame 500. In the circuit board 300, the control circuit board 310 and the power supply circuit board 320 may be arranged separately before and after the frame 500.

  In addition to those already described above, the methods according to the above-described embodiments and modifications may be used in appropriate combination.

DESCRIPTION OF SYMBOLS 1 Sewing machine 10 Opening 12 Notch part 20 Sewing machine table 100 Sewing machine main body 102 Leg pillar part 103 Arm part 200 Undercover 202 2nd lower surface 330 Heat-generating component

Claims (6)

In the sewing machine table that can be installed with a sewing machine body and forms an opening in which a metal under cover that covers the lower part of the sewing machine body can be placed,
The opening is
A sewing table having a notch on a side where the heat generating component is arranged when the under cover for arranging the heat generating component used for driving control of the sewing machine body is attached to the sewing machine table. A sewing machine table with an opening;
A sewing machine body installed at the opening of the sewing table;
A metal under cover provided at the opening portion of the sewing machine table and covering a lower portion of the sewing machine body;
A heating part disposed on one end side of the lower surface of the under cover and used for driving control of the sewing machine body,
The sewing table is
A sewing machine comprising a notch on a side corresponding to the one end side of the under cover of the opening. The sewing machine according to claim 2, wherein
A sewing machine comprising: a circuit board used for driving control of the sewing machine body on a side different from the one end side of the lower surface of the under cover. The sewing machine according to claim 2 or 3,
The sewing machine body is
A pedestal standing from the sewing machine table, and an arm extending to the left from the upper part of the pedestal,
The heat generating component is
It is arranged on one end side corresponding to the pedestal side in the sewing machine body on the lower surface of the under cover,
The notch is
The sewing machine is provided on a side of the opening corresponding to the pedestal side of the sewing machine body. The sewing machine according to any one of claims 2 to 4,
The heat generating component is
The sewing machine is provided so as to be in contact with a lower surface of the under cover. The sewing machine according to any one of claims 2 to 5,
The sewing machine according to claim 1, wherein the heat generating component is a regenerative resistor.

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