Sewing machine rack

Abstract

The invention provides a sewing machine frame which has rigidity and light weight compared with the prior art. A sewing machine frame (5) is provided with: a column frame (4); and an arm frame (8) extending from one end of the column frame (4) in the longitudinal direction (D) in an extension direction (J) orthogonal to the longitudinal direction (D). The arm frame (8) is provided with a first extension plate (81), a second extension plate (82), and an extension middle plate (83). The first extension plate (81) extends in an extension direction (J). The second extension plate (82) is separated from the first extension plate (81) in the longitudinal direction (D), faces the first extension plate (81), and extends in the extension direction (J). The extension middle plate (83) extends in the length direction (D) and the extension direction (J). The extension middle plate (83) connects the first extension plate (81) and the second extension plate (82) in the longitudinal direction (D). The extension middle plate (83) is provided with curved surfaces (831, 832).

Description

Technical Field

[0001] The present invention relates to a sewing machine frame. Background Art

[0002] In the existing sewing machine frame, the horizontal cross-section of the column constituting the sewing machine frame is formed in an S shape along the length directions of the arm and the base. The sewing machine frame has an X-shaped rib inside one frame located on the front end side of the arm to strengthen the rigidity of the column. The column and the rib are made of a resin lighter than cast iron and aluminum die-castings, achieving weight reduction compared with the existing sewing machines.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Laid-Open No. 2008-245733 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In the existing sewing machine frame, the influence of the load acting on the arm due to the driving of the needle bar disposed at a position away from the column cannot be ignored. If the thickness of the sewing machine frame is increased or ribs are added to ensure the rigidity of the sewing machine frame, the light weight of the sewing machine frame will be impaired. Therefore, it is difficult to balance the rigidity and the light weight of the sewing machine frame.

[0008] An object of the present invention is to provide a sewing machine frame that balances rigidity and light weight compared with the prior art.

[0009] Technical Means for Solving the Problems

[0010] The sewing machine frame according to the first aspect of the present invention includes: a column frame; and an extension frame that extends from one end in the length direction of the column frame in an extension direction orthogonal to the length direction. The extension frame has: a first extension plate that extends in the extension direction; a second extension plate that is separated from the first extension plate in the length direction, faces the first extension plate, and extends in the extension direction; and an extension middle plate that extends in the length direction and the extension direction and connects the first extension plate and the second extension plate in the length direction and has a curved surface. In the sewing machine frame where a load is likely to be applied due to the driving of the sewing machine, compared with the case where the extension middle plate only has a flat surface, the extension middle plate of the sewing machine frame according to the first aspect helps to improve the rigidity of the extension frame without increasing the weight. That is, compared with the prior art, the extension middle plate of the sewing machine frame helps to balance rigidity and light weight.

[0011] The sewing machine frame according to the second aspect of the present invention includes: a column frame; and an arm frame extending from the column frame in an extending direction orthogonal to the length direction of the column frame. The arm frame has: a first extension plate extending in the extending direction; a second extension plate separated from the first extension plate in the length direction, opposed to the first extension plate, and extending in the extending direction; and an intermediate extension plate extending in the extending direction and connecting the first extension plate and the second extension plate, and having a curved surface with a cross-section perpendicular to the length direction. The sewing machine frame of the second aspect has the same effect as the sewing machine frame of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. is a perspective view of the sewing machine 1 with the cover 25 removed.

[0013] Figure 2 FIG. is a perspective view of the sewing machine frame 5.

[0014] Figure 3 FIG. is a front view of the sewing machine frame 5.

[0015] Figure 4 FIG. is a perspective view of the sewing machine frame 5.

[0016] Figure 5 FIG. is a rear view of the sewing machine frame 5.

[0017] Figure 6 FIG. is a right side view of the sewing machine frame 5.

[0018] Figure 7 FIG. is a perspective view of the sewing machine frame 5.

[0019] Figure 8 FIG. is a bottom view of the sewing machine frame 5.

[0020] Figure 9 FIG. is Figure 3 a sectional view taken along the viewing direction at the line 9-9 of

[0021] Figure 10 FIG. is Figure 3 a sectional view taken along the viewing direction at the line 10-10 of

[0022] Figure 11 FIG. is Figure 3 a sectional view taken along the viewing direction at the line 11-11 of

[0023] Figure 12 FIG. is a top view of the sewing machine frame 5. DETAILED DESCRIPTION

[0024] The sewing machine 1 having the sewing machine frame 5 according to an embodiment of the present disclosure will be described with reference to the drawings.Figure 1 The up-down direction, lower-left direction, upper-right direction, upper-left direction, and lower-right direction of [object] are respectively the up-down direction, left direction, right direction, rear direction, and front direction of the sewing machine 1. Figure 2 The up-down direction, lower-left direction, upper-right direction, upper-left direction, and lower-right direction of [object] are respectively the up-down direction, left direction, right direction, rear direction, and front direction of the sewing machine frame 5. The longitudinal direction D of the columns 12 and the column frame 4 is the up-down direction of the sewing machine 1 and the sewing machine frame 5. The left side is defined as the extending direction J. The front-rear direction orthogonal to the longitudinal direction D and the extending direction J respectively is defined as the orthogonal direction W. The direction from the needle bar 26 toward the presser bar 28 is the rear, which is defined as the positive feed direction F and the second direction K2. The opposite direction of the positive feed direction F is the front, which is defined as the reverse feed direction B and the first direction K1.

[0025] As Figure 1 and Figure 2 As shown in [figures], the sewing machine 1 has a sewing machine frame 5, a base 7, columns 12, and an arm 13. The sewing machine frame 5 is formed of a metal with relatively high rigidity such as aluminum alloy, and supports the components of the sewing machine 1. The sewing machine frame 5 is in a U shape that is open on the left side in the front view. The sewing machine frame 5 has a column frame 4, a base frame 6, and an arm frame 8. The arm frame 8 extends from one end of the longitudinal direction D of the column frame 4 toward the extending direction J orthogonal to the longitudinal direction D. The base frame 6 extends from the other end of the longitudinal direction D of the column frame 4 toward the extending direction J orthogonal to the longitudinal direction D. The detailed structure of the sewing machine frame 5 will be described later.

[0026] The columns 12 extend in the up-down direction. Inside the columns 12, the sewing machine 1 has a column frame 4, a sewing machine motor (not shown), a transmission member (not shown), and a power supply (not shown). The column frame 4 supports the sewing machine motor and the transmission member. The sewing machine motor rotates a main shaft (described later) using the power supplied from the power supply. The transmission member transmits the power of the sewing machine motor to a lower shaft (described later). The sewing machine 1 has a longitudinally long liquid crystal display (LCD) 17 and a touch screen 16 on the front surface of the columns 12. The LCD 17 displays messages and the like required for sewing operations. The touch screen 16 is located on the front surface of the LCD 17. When the user operates the touch screen 16 with an indicator such as a finger or a special pen in order to select an item displayed on the LCD 17, the touch screen 16 detects the selection position. The user can input various instructions to the sewing machine 1 via the touch screen 16.

[0027] The base 7 extends from the lower end of the column 12 in the extending direction J orthogonal to the vertical direction. The upper surface 15 of the base 7 extends in the horizontal direction and is provided with a needle plate 3. Needle holes for inserting the sewing needle 29 are formed in the needle plate 3. The sewing machine 1 has a base frame 6, a lower shaft (not shown), a feed mechanism, a bobbin mechanism, etc. below the needle plate 3 of the base 7. The base frame 6 supports the lower shaft, the feed mechanism, and the bobbin mechanism. The lower shaft extends in the left-right direction. The feed mechanism has feed teeth and drives the feed teeth according to the rotation of the lower shaft to move the workpiece to be sewn in the forward feed direction F or the reverse feed direction B by a specified amount of movement. The forward feed direction F corresponds to the direction in which the sewing machine 1 is disposed relative to the user. The bobbin mechanism has a bobbin and drives the bobbin according to the rotation of the lower shaft to wind the upper thread and the bobbin thread around each other.

[0028] The arm 13 extends from the upper end of the column 12 above the base 7 in the extending direction J parallel to the base 7. The sewing machine 1 has an arm frame 8, a main shaft, etc. inside the arm 13. The arm 13 has a head 14 at its left end. The head 14 is provided with a needle bar mechanism 21, a thread take-up lever mechanism 23, an image sensor 22, and a projector module 20. The arm frame 8 supports the needle bar mechanism 21, the thread take-up lever mechanism 23, the image sensor 22, and the projector module 20. The head 14 is also provided with a detachable cover 25. The needle bar mechanism 21, the thread take-up lever mechanism 23, the projector module 20, and the image sensor 22 are supported by a metal frame fixed to the front of the sewing machine frame 5 and covered by the cover 25 in the state of being mounted on the head 14.

[0029] The needle bar mechanism 21 has a needle bar 26 extending in the vertical direction and reciprocates the needle bar 26 in the vertical direction. The lower end portion of the needle bar 26 projects downward from the lower end of the head 14. The sewing needle 29 is detachably mounted at the lower end of the needle bar 26. The sewing needle 29 mounted on the needle bar 26 reciprocates in the vertical direction. The presser bar 28 extends in the vertical direction behind the needle bar 26 and reciprocates in the vertical direction synchronously with the drive of the needle bar 26. The presser foot 70 is detachably mounted at the lower end of the presser bar 28. The upper thread passing through the sewing needle 29 is wound around the bobbin thread through the bobbin to form a stitch on the workpiece to be sewn. The thread take-up lever mechanism 23 has a thread take-up lever 24 formed with a hole for passing the upper thread. The thread take-up lever 24 is disposed in the reverse feed direction B with respect to the needle bar 26, that is, in front of the needle bar 26. The thread take-up lever mechanism 23 reciprocates the thread take-up lever 24 in the vertical direction. Thus, the thread take-up lever 24 lifts the upper thread and adjusts the position of the knot with the bobbin thread.

[0030] The image sensor 22 captures the imaging area R2 on the base 7. An example of the object to be imaged by the image sensor 22 is a projected image projected onto the object to be sewn. The imaging area R2 includes at least a part of the projection area R1 of the projector 2 described later. The projector module 20 and the needle bar 26 are separately arranged in the extending direction J. The projector module 20 includes the projector 2. The projector 2 is provided at the front end of the arm 13 in the extending direction J and is configured to project a projected image onto the projection area R1 on the base 7.

[0031] The sewing machine 1 has a plurality of switches including a start / stop switch 27 on the front surface of the arm 13. The start / stop switch 27 is a switch for instructing the start and stop of the sewing operation. The sewing machine 1 has an openable and closable sewing machine cover (not shown) on the upper part of the arm 13. Figure 1 In the figure, the illustration of the sewing machine cover of the arm 13 is omitted. The sewing machine 1 has a thread storage portion 18 on the upper surface 19 of the arm 13 that is exposed when the sewing machine cover is open. The thread storage portion 18 is a downwardly concave portion capable of storing a bobbin wound with the top thread.

[0032] A brief description of the operation of the sewing machine 1 having the above structure during sewing is given. When the sewing machine 1 detects the pressing of the start / stop switch 27, it drives the bobbin mechanism, the feeding mechanism, the needle bar mechanism 21, and the thread take-up lever mechanism 23 synchronously. Thereby, a stitch is formed on the object to be sewn placed on the upper surface 15 of the base 7 by the sewing needle 29 mounted on the needle bar 26.

[0033] Refer to Figures 2 to 12 the sewing machine frame 5 will be described in detail. The longitudinal direction D of the column frame 4 is defined as the vertical direction. The extending direction J orthogonal to the longitudinal direction D is defined as the left direction. The orthogonal direction W orthogonal to the longitudinal direction D and the extending direction J respectively is defined as the front-rear direction. The orthogonal direction W is two-way and includes a first direction K1 and a second direction K2 opposite to the first direction K1. In this example, the orthogonal direction W is the front-rear direction, the first direction K1 is the front, and the second direction K2 is the rear. The thickness of the rib disposed on the sewing machine frame 5 is defined as the length in the width direction orthogonal to the protruding direction and the longitudinal direction of the rib respectively.

[0034] As Figures 2 to 7As shown, the column frame 4 includes a first column plate 41, a connecting curved plate 44, a second column plate 42, a column upper plate 121, a column lower plate 110, column plates 30 and 43, first column ribs 45, 46, 31, 32, 39, and second column ribs 47 to 58, 33 to 38. The first column plate 41 and the second column plate 42 extend in the longitudinal direction D. The first column plate 41 constitutes the left surface of the column frame 4. The connecting curved plate 44 is a plate that is bent into an arc shape in the front view and is disposed below the connecting portion 40 of the arm frame 8 and the column frame 4. The second column plate 42 constitutes the right surface of the column frame 4. As Figure 6 shown, the column frame 4 is trapezoidal in the right side view. The length L6 in the orthogonal direction W at the lower end of the column frame 4 is longer than the length L5 in the orthogonal direction W at the upper end of the column frame 4. The second column plate 42 has a recess 421. Through holes 422 and 423 that penetrate the second column plate 42 in the left-right direction are formed in the second column plate 42. The recess 421 is recessed leftward in the upper part of the second column plate 42. In the recess 421, ribs 425 and 426 that are X-shaped in the right side view are arranged in the up-down direction. The hole 422 is rectangular in the right side view and is formed below the recess 421. The hole 423 is rectangular in the right side view and is formed below the hole 422. In the right side view, the size of the hole 423 is larger than the size of the hole 422. When the sewing machine frame 5 is assembled to the sewing machine 1, the sewing motor of the sewing machine 1 is disposed in the hole 422. The power supply is disposed in the hole 423.

[0035] The column upper plate 121 extends in the horizontal direction orthogonal to the up-down direction at the upper end of the column frame 4. The column upper plate 121 is continuous with a first extension plate 81 of the arm frame 8 described later. The column lower plate 110 extends in the horizontal direction orthogonal to the up-down direction at the lower end of the column frame 4. The column lower plate 110 is continuous with a second base plate 62 of the base frame 6 described later. As Figure 8 shown, a column hole 111 that penetrates in the up-down direction and has sides that are bent in the bottom view is formed in the column lower plate 110. Among the sides 112 to 115 that constitute the four sides of the column hole 111, the front side 113 and the rear side 115 are bent into an arc shape that is recessed rearward in the bottom view. The left side 112 and the right side 114 extend linearly in the front-rear direction in the bottom view.

[0036] As Figure 2 and Figure 3 shown, the column plate 43 extends in the extending direction J and the longitudinal direction D. The column plate 43 connects the first column plate 41 and the second column plate 42 in the left-right direction. As Figure 9 and Figure 10As shown, the column plate 43 has curved surfaces 433 and 434. The curved surface 433 is the back surface of the column plate 43. The curved surface 434 is the front surface of the column plate 43. The curved surface 433 extends upward from the curved edge 113 of the column hole 111. The curved surfaces 433 and 434 are curved surfaces whose cross-sectional shape perpendicular to the length direction D is a curve. The column plate 43 is connected to the first column plate 41 at portions separated from both ends of the first column plate 41 in the orthogonal direction W. The column plate 43 is connected to the second column plate 42 at the rear end of the second column plate 42 in the orthogonal direction W. The column plate 43 is bent to match the shape of the sewing machine motor and power supply when the column plate 43 and the sewing machine frame 5 are assembled to the sewing machine 1. Specifically, as Figure 4 shown, the column plate 43 is bent upward after being bent in the second direction K2 above the hole 422 in the length direction D. The position of the portion 431 above the hole 422 in the orthogonal direction W of the column plate 43 is located behind the portion 432 below the hole 422. The portion 431 is connected to the extending middle plate 83.

[0037] As Figure 4 and Figure 5 shown, the column plate 30 extends in the extending direction J and the length direction D. The column plate 30 connects the first column plate 41 and the second column plate 42 in the left-right direction. As Figure 9 and Figure 10 shown, the column plate 30 has curved surfaces 303 and 304. The curved surface 303 is the front surface of the column plate 30. The curved surface 304 is the back surface of the column plate 30. The curved surface 303 extends upward from the curved edge 115 of the column hole 111. The curved surfaces 303 and 304 are curved surfaces whose cross-sectional shape perpendicular to the length direction D is a curve. The column plate 30 is connected to the first column plate 41 at a portion behind the column plate 43 and separated from both ends of the first column plate 41 in the orthogonal direction W. The column plate 30 is not connected to the second column plate 42. The column plate 30 is bent to match the shape of the sewing machine motor and power supply when the column plate 30 and the sewing machine frame 5 are assembled to the sewing machine 1. Specifically, as Figure 7 shown, the column plate 30 is bent upward after being bent in the first direction K1 above the hole 423 in the length direction D. The position of the portion 301 above the hole 423 in the orthogonal direction W of the column plate 30 is located in front of the portion 302 below the hole 423. The distance in the orthogonal direction W between the column plate 43 and the column plate 30 increases in the order of the concave portion 421, the hole 422, and the hole 423.

[0038] As Figure 2 , Figure 3 and Figure 7As shown, the first column ribs 45, 46 and the second column ribs 47 to 58 protrude forward from the front surface of the column plate 43. The first column ribs 45, 46 are arranged on the tangent line of the connecting curved plate 44 in the front view. The connecting curved plate 44 has a connecting portion 451 connected to the first column rib 45, a connecting portion 461 connected to the first column rib 46, a connecting portion 481 connected to the second column rib 48, and a connecting portion 491 connected to the second column rib 49. The first column rib 45 extends obliquely downward to the right from the connecting portion 451 of the connecting curved plate 44. The first column rib 46 extends obliquely downward to the right from the connecting portion 461 located below the first column rib 45. The extension setting angle of the first column rib 45 clockwise with respect to the horizontal direction in the front view is smaller than the extension setting angle of the first column rib 46 clockwise with respect to the horizontal direction in the front view.

[0039] The second column rib 47 extends in the vertical direction at the upper part of the column frame 4. The upper end of the second column rib 47 is connected to the column upper plate 121. The lower end of the second column rib 47 is connected to the first column rib 45. The second column rib 48 extends to the right from the connecting portion 481 at the left end of the connecting curved plate 44. The right end of the second column rib 48 is connected to the second column rib 47. The second column rib 49 extends obliquely upward to the right from the connecting portion 491 between the connecting portion 481 and the connecting portion 451 in the connecting curved plate 44. The right end of the second column rib 49 is connected to the right end of the second column rib 48 and the second column rib 47. The second column rib 50 extends obliquely downward to the right from the connecting portion 501 where the second column rib 47 is connected to the second column ribs 48, 49. The second column rib 50 intersects with the second column rib 58 described later. The second column rib 50 has an intersection portion 502 that intersects with the second column rib 58. The right end of the second column rib 50 is connected to the second column plate 42. The second column rib 50 has a connecting portion 511 connected to the second column rib 51 between the intersection portion 502 and the connecting portion 501 which is the left end of the second column rib 50. The second column rib 51 extends obliquely upward to the right from the connecting portion 511. The right end of the second column rib 51 is connected to the second column plate 42.

[0040] The second column rib 52 extends in the left - right direction below and to the left of the left end of the first column rib 46. The left end of the second column rib 52 is connected to the first column plate 41. The right end of the second column rib 52 is connected to the second column plate 42. The second column rib 52 has an intersection part 521 that intersects with the first column rib 45 and an intersection part 522 that intersects with the first column rib 46. The second column rib 53 extends in the left - right direction below the second column rib 52. The left end of the second column rib 53 is connected to the first column plate 41. The right end of the second column rib 53 is connected to the second column plate 42. The second column rib 53 intersects with the first column rib 46. The second column rib 54 is connected to the lower end of the first column rib 45. The position of the second column rib 53 in the length direction D is substantially the same as the position of the first machine base plate 61 of the machine base frame 6 described later in the length direction D. The second column rib 54 extends in a V - shape in the front view below the second column rib 53. The second column rib 54 is connected to the lower ends of the first column ribs 45 and 46. The left end and the right end of the second column rib 54 are connected to the second column rib 53.

[0041] The second column ribs 55 and 56 extend obliquely downward to the right from the lower end of the first column plate 41 respectively. The lower ends of the second column ribs 55 and 56 are connected to the column lower plate 110 respectively. The lower end of the second column rib 55 is located at the extension direction J relative to the lower end of the second column rib 56. The second column rib 57 extends in the left - right direction below the second column rib 53. The left end of the second column rib 57 is connected to the second column rib 56. The right end of the second column rib 57 is connected to the second column plate 42. The first column rib 46 has a connection part 581 connected to the second column rib 58 between the connection part 461 and the intersection part 521. The second column rib 58 extends obliquely upward to the right from the connection part 581. The second column rib 58 intersects with the second column rib 50 and the first column rib 45 respectively. The right end of the second column rib 58 is connected to the second column plate 42.

[0042] The lengths of the first column ribs 45 and 46 in the length direction D are longer than the lengths of the second column ribs 47 to 58 in the length direction D. In the shape of the cross - section perpendicular to the orthogonal direction W, the thicknesses of the first column ribs 45 and 46 are larger than the thicknesses of the second column ribs 47 to 58. The thicknesses of the first column ribs 45 and 46 can be the same as each other or different from each other. The thicknesses of the second column ribs 47 to 58 can be the same as each other or different from each other. The thicknesses of the first column ribs 45 and 46 are preferably 1.2 times to 3.0 times the thicknesses of the second column ribs 47 to 58. For example, the thickness P1 of the first column ribs 45 and 46 is 5 mm, and the thickness P2 of the second column ribs 47 to 58 is 3 mm. The protrusion amounts of the first column ribs 45 and 46 in the orthogonal direction W are larger than the protrusion amounts of the machine arm ribs 86 to 89, 94, and 95 described later in the orthogonal direction W.

[0043] As Figure 4 and Figure 5As shown, the first column ribs 31, 32, 39 and the second column ribs 33 to 38 protrude rearward from the back surface of the column plate 30. The connecting curved plate 44 has a connecting portion 341 connected to the second column rib 34, a connecting portion 351 connected to the second column rib 35, a connecting portion 311 connected to the first column rib 31, and a connecting portion 321 connected to the first column rib 32. The first column ribs 31, 32 are arranged on the tangent line of the connecting curved plate 44 in a rear view. The first column rib 31 extends obliquely downward to the right from the connecting portion 311 of the connecting curved plate 44. The first column rib 32 extends obliquely downward to the right from the connecting portion 321 of the connecting curved plate 44 at a position lower than the first column rib 31. The first column rib 39 extends along the longitudinal direction D at the right end portion of the back surface of the column frame 4. The upper end of the first column rib 39 is connected to the column upper plate 121, and the lower end of the first column rib 39 is connected to the column lower plate 110. The first column rib 39 is connected to the right ends of the first column rib 31 and the first column rib 32 respectively.

[0044] The second column rib 33 extends in an arc shape protruding upward and to the right at the upper part of the column frame 4. The upper end of the second column rib 33 is connected to the column upper plate 121. The lower end of the second column rib 33 is connected to the first column rib 39. The second column rib 34 extends upward and to the right from the connecting portion 341 of the connecting curved plate 44. The upper end of the second column rib 34 is connected to the upper end of the second column rib 33. The connecting portion 351 is arranged between the connecting portion 341 and the connecting portion 311. The second column rib 35 extends upward and to the right from the connecting portion 351. The right end of the second column rib 35 is connected to the second column rib 33. The second column rib 36 extends obliquely downward to the right below the second column rib 35. The right end of the second column rib 36 is connected to the first column rib 39. The left end of the second column rib 36 is connected to the first column rib 32. The second column rib 36 intersects the first column rib 31. The second column rib 37 extends along the left - right direction below the second column rib 36. The second column rib 37 intersects the first column rib 39. The left end of the second column rib 37 is connected to the first column plate 41. The second column rib 37 is connected to the lower end of the first column rib 31. The second column rib 37 intersects the first column rib 32. The second column rib 38 extends obliquely downward to the right from the lower end of the first column plate 41. The lower end of the second column rib 38 is connected to the lower end of the first column rib 39 and the column lower plate 110.

[0045] The lengths of the first column ribs 31, 32, and 39 in the length direction D are longer than the lengths of the second column ribs 33 to 38 in the length direction D. In the shape of the cross-section perpendicular to the orthogonal direction W, the thicknesses of the first column ribs 31, 32, and 39 are larger than the thicknesses of the second column ribs 33 to 38. The thicknesses of the first column ribs 31, 32, and 39 may be the same as each other or different from each other. The thicknesses of the first column ribs 31, 32, and 39 are preferably 1.2 times to 3.0 times the thicknesses of the second column ribs 33 to 38. For example, the thickness Q1 of the first column ribs 31, 32, and 39 is 5 mm, and the thickness Q2 of the second column ribs 33 to 38 is 3 mm. In the column plate 43, holes 101 and 102 are formed that penetrate the column plate 43 in the orthogonal direction W. In the column plate 30, holes 103 to 108 are formed that penetrate the column plate 30 in the orthogonal direction W.

[0046] As Figures 2 to 5 shown, the base frame 6 extends from the lower end of the column frame 4 in the extending direction J and faces the arm frame 8. The base frame 6 includes a first base plate 61, a second base plate 62, a base middle plate 63, base ribs 66 and 67, and shuttle support plates 64 and 65. The first base plate 61 extends in the orthogonal direction W and the extending direction J. Regarding the length of the first base plate 61 in the orthogonal direction W, the portion closer to the front end in the extending direction J is shorter than the portion closer to the rear end in the extending direction J. That is, the length of the left end portion of the first base plate 61 in the orthogonal direction W is shorter than the length of the right end portion of the first base plate 61 in the orthogonal direction W. The second base plate 62 is separated from the first base plate 61 in the length direction D, faces the first base plate 61, and extends in the orthogonal direction W and the extending direction J. The length of the second base plate 62 in the orthogonal direction W is shorter than the length of the first base plate 61 in the orthogonal direction W. The base middle plate 63 extends in the length direction D and the extending direction J. The base middle plate 63 connects the first base plate 61 and the second base plate 62 in the length direction D. The base middle plate 63 is connected to the column plate 43. As Figure 9 shown, the base middle plate 63 has curved surfaces 631 and 632 whose cross-sectional shapes perpendicular to the length direction D are curved. The curved surface 631 is the front surface of the base middle plate 63. The curved surface 632 is the back surface of the base middle plate 63. In this example, the base middle plate 63 extends in the extending direction J while bending one or more times in the orthogonal direction W. The length R4 of the extending range of the base middle plate 63 in the orthogonal direction W is smaller than 1 / 2 of the length of the extending range of the first base plate 61 in the orthogonal direction W, and smaller than 1 / 2 of the length of the extending range of the second base plate 62 in the orthogonal direction W. In this example, the length R4 of the extending range of the base middle plate 63 in the orthogonal direction W is larger than 1.2 times the thickness L8 of the base middle plate 63, and more specifically, larger than 1.7 times the thickness L8 of the base middle plate 63.

[0047] As Figure 2and Figure 3 As shown, the base rib 67 projects forward from the front surface of the base middle plate 63. The base rib 67 is bent into an L shape in the front view. The lower end of the base rib 67 is connected to the second base plate 62. In the base middle plate 63, a hole 69 is formed along the base rib 67. As Figure 4 and Figure 5 shown, the base rib 66 projects backward from the back surface of the base middle plate 63. The base rib 66 extends in a Y shape in the rear view. The upper end of the base rib 66 is connected to the first base plate 61. The lower end of the base rib 66 is connected to the second base plate 62. The left end of the base rib 66 is connected to the shuttle support plate 65. In the base middle plate 63, a hole 68 is formed along the base rib 66.

[0048] The shuttle support plates 64 and 65 are arranged at the front end in the extending direction J of the base frame 6. The shuttle support plates 64 and 65 support the shuttle mechanism of the sewing machine 1. The shuttle support plate 64 is connected to the front end in the extending direction J of the second base plate 62, extends in the horizontal direction, and extends in the extending direction J. The vertical position of the shuttle support plate 64 is located above the vertical position of the second base plate 62. The shuttle support plate 65 extends upward from the rear end of the shuttle support plate 64. The shuttle support plate 65 is connected to the front end in the extending direction J of the base middle plate 63. The cross section of the shuttle support plate 65 perpendicular to the length direction D is linear in the top view.

[0049] The machine arm frame 8 includes a first extension plate 81, a second extension plate 82, an extension middle plate 83, machine arm ribs 86 to 89, 94 to 100, a machine head frame 84, and a projector support plate 85. The first extension plate 81 extends in the horizontal direction and extends in the extending direction J. The first extension plate 81 is connected to the front end in the extending direction J of the column upper plate 121. The second extension plate 82 is separated from the first extension plate 81 in the length direction D, faces the first extension plate 81, extends in the horizontal direction, and extends in the extending direction J. The second extension plate 82 is connected to the front end in the extending direction J of the connecting curved plate 44. The extension middle plate 83 extends in the length direction D and the extending direction J. The extension middle plate 83 connects the first extension plate 81 and the second extension plate 82 in the length direction D. The extension middle plate 83 is connected to the column plate 43.

[0050] As Figure 11 and Figure 12As shown, the contour of the end 811 of the first extension plate 81 in the first direction K1, i.e., the first extension contour, is a curve when viewed from above. The contour of the end 812 of the first extension plate 81 in the second direction K2 is a straight line when viewed from above. The contour of the end 821 of the second extension plate 82 in the first direction K1, i.e., the second extension contour, is a curve when viewed from above. The contour of the end 822 of the second extension plate 82 in the second direction K2 is a straight line when viewed from above. The end 821 of the second extension plate 82 is located closer to the first direction K1 than the end 811 of the first extension plate 81. The length of the first extension plate 81 in the orthogonal direction W is the longest length L1 at the portion 813 and the shortest length L2 at the portion 814. In the first extension plate 81, the portion 814 where the length in the orthogonal direction W is the shortest is located closer to the extension direction J than the portion 813 where the length in the orthogonal direction W is the longest. The length of the second extension plate 82 in the orthogonal direction W is the longest length L3 at the portion 823 and the shortest length L4 at the portion 824. In the second extension plate 82, the portion 824 where the length in the orthogonal direction W is the shortest is located closer to the extension direction J than the portion 823 where the length in the orthogonal direction W is the longest. Regarding the lengths of the first extension plate 81 and the second extension plate 82 in the orthogonal direction W, the portions closer to the front end in the extension direction J are shorter than the portions closer to the rear end in the extension direction J.

[0051] As Figure 11 shown, the extending middle plate 83 has curved surfaces 831, 832. The curved surface 831 is the front surface of the extending middle plate 83. The curved surface 832 is the back surface of the extending middle plate 83. The curved surfaces 831, 832 are curved surfaces whose shapes of cross-sections perpendicular to the length direction D, i.e., cross-sections extending in the horizontal direction, are curves. The extending middle plate 83 is connected to the first extension plate 81 at portions separated from both ends of the first extension plate 81 in the orthogonal direction W, and the extending middle plate 83 is connected to the second extension plate 82 at portions separated from both ends of the second extension plate 82 in the orthogonal direction W.

[0052] The length R3 of the extending range of the extending intermediate plate 83 in the orthogonal direction W is smaller than 1 / 2 of the length of the extending range of the first extending plate 81 in the orthogonal direction W and smaller than 1 / 2 of the length of the extending range of the second extending plate 82 in the orthogonal direction W. The end portion 812 of the first extending plate 81 extends linearly in a plan view, so the length of the extending range of the first extending plate 81 in the orthogonal direction W is the length L1 of the portion 813. The end portion 822 of the second extending plate 82 extends linearly in a plan view, so the length of the extending range of the second extending plate 82 in the orthogonal direction W is the length L3 of the portion 823. The length R3 of the extending range of the extending intermediate plate 83 in the orthogonal direction W in this example is larger than 1.2 times the thickness L7 of the extending intermediate plate 83, and more specifically, larger than 1.7 times the thickness L7 of the extending intermediate plate 83. The front end of the extending direction J of the extending intermediate plate 83 is arranged near the center of the second extending plate 82 in the orthogonal direction W in the orthogonal direction W. The rear end of the extending direction J of the extending intermediate plate 83 is arranged behind the center of the second extending plate 82 in the orthogonal direction W in the orthogonal direction W. The cross-section of the extending intermediate plate 83 extending in the horizontal direction has a plurality of convex portions protruding in the orthogonal direction W in a plan view. Among the front surface and the back surface of the extending intermediate plate 83, the area of the portion in contact with the imaginary lines U1 and U2 extending in the extending direction J for defining the extending range of the extending intermediate plate 83 in the orthogonal direction W is smaller than the area of the portion separated from the imaginary lines U1 and U2. Among the front surface and the back surface of the extending intermediate plate 83, the area of the flat portion is smaller than the area of the curved surface portion. The extending intermediate plate 83 in this example extends in the extending direction J while being bent multiple times in the orthogonal direction W, but is not limited to this structure, and as long as it has a curved surface that is bent at least once and extends in the extending direction J.

[0053] As Figure 2 and Figure 3As shown, the arm ribs 86 to 89, 94, 95 protrude forward along the orthogonal direction W from the front surface of the extended middle plate 83. The arm rib 86 is a rib bent in an L shape in the front view. The upper end of the arm rib 86 is connected to the first extension plate 81, and the lower end of the arm rib 86 is connected to the second extension plate 82. The arm ribs 87, 88 are ribs in an X shape in the front view. The upper ends of the arm ribs 87, 88 are respectively connected to the first extension plate 81, and the lower ends of the arm ribs 87, 88 are respectively connected to the second extension plate 82. In the extension direction J, the arm rib 87 is arranged between the arm rib 86 and the arm rib 88. The arm rib 89 extends obliquely upward to the left from the front end portion of the connecting curved plate 44 in the extension direction J. The upper end of the arm rib 89 is connected to the first extension plate 81, and the lower end of the arm rib 89 is connected to the second extension plate 82. The arm rib 89 is arranged on the tangent line of the connecting curved plate 44 that is the same as the tangent line where the first column rib 45 is arranged. The arm rib 94 extends upward from the lower end of the arm rib 89. The upper end of the arm rib 94 is connected to the first extension plate 81. The arm rib 95 extends obliquely upward to the right from the left side of the connecting portion 481. The upper end of the arm rib 95 is connected to the first extension plate 81. The thicknesses of the arm ribs 86 to 89, 94, 95 may be the same as each other or different from each other. The thicknesses P1 of the first column ribs 45, 46 are larger than the thicknesses F1 of the arm ribs 86 to 89, 94, 95. The thicknesses P2 of the second column ribs 47 to 58 are smaller than the thicknesses P1 of the first column ribs 45, 46. In this example, the thicknesses F1 of the arm ribs 86 to 89, 94, 95 are the same as the thicknesses P2 of the second column ribs 47 to 58, for example, 3 mm. The thicknesses F1 of the arm ribs 86 to 89, 94, 95 may also be different from the thicknesses P2 of the second column ribs 47 to 58.

[0054] As Figure 4 and Figure 5As shown, the arm ribs 96 to 100 project rearward from the back surface of the extending intermediate plate 83 along the orthogonal direction W. The arm ribs 96 to 99 are ribs that form an X shape in a rear view. The arm rib 100 extends in the length direction D. The arm ribs 96 to 100 are arranged in sequence from the front end to the rear end in the extending direction J. The upper ends of the arm ribs 96 to 100 are connected to the first extending plate 81, and the lower ends of the arm ribs 96 to 100 are connected to the second extending plate 82. The thicknesses of the arm ribs 96 to 100 may be the same as each other or different from each other. The thicknesses of the arm ribs 96 to 100 are smaller than the thicknesses of the first column ribs 31, 32, 39. The protruding amount of the arm rib 96 in the orthogonal direction W is larger than the protruding amounts of the arm ribs 97 to 100 in the orthogonal direction W. The thickness Q1 of the first column ribs 31, 32, 39 is larger than the thickness F2 of the arm ribs 96 to 100. The thickness Q2 of the second column ribs 33 to 38 is smaller than the thickness Q1 of the first column ribs 31, 32, 39. In this example, the thickness F2 of the arm ribs 96 to 100 is the same as the thickness Q2 of the second column ribs 33 to 38, for example, 3 mm. The thickness F2 of the arm ribs 96 to 100 may also be different from the thickness Q2 of the second column ribs 33 to 38. The protruding amounts of the arm ribs 97 to 100 rearward are smaller than the protruding amounts of the arm ribs 86 to 89, 94, 95 forward.

[0055] A plurality of holes 90 to 93 penetrating along the orthogonal direction W are formed in the extending intermediate plate 83. The hole 90 is a triangular hole formed along the arm rib 96 and is triangular in a front view. The hole 91 is a rectangular hole formed along the arm ribs 88, 97 and is rectangular in a front view. The hole 92 is a rectangular hole formed along the arm ribs 88, 98 and is rectangular in a front view. The hole 93 is a rectangular hole formed along the arm ribs 89, 99 and is rectangular in a front view.

[0056] The head frame 84 is disposed at the front end portion of the extending direction J of the arm frame 8. The head frame 84 is in a U shape that is open at the front in a top view. When the sewing machine frame 5 is assembled to the sewing machine 1, the head frame 84 supports the needle bar mechanism 21 and the thread take-up lever mechanism 23. The projector support plate 85 is connected to the front end of the head frame 84 in the extending direction J. When the sewing machine frame 5 is assembled to the sewing machine 1, the projector support plate 85 supports the projector module 20 at a position closer to the extending direction J than the needle bar mechanism 21.

[0057] Taking the sewing machine frame 5 with the above structure as an example, and taking a sewing machine frame with the same sizes in the length direction D and the extension direction J as the sewing machine frame 5 and having the same structure as the existing sewing machine frame, for example, the sewing machine frame of the sewing machine described in Japanese Patent Laid-Open No. 2020-5694, as a comparative example, the rigidity and lightness of the sewing machine frame 5 of this example were evaluated. It was assumed that the materials were the same in the existing sewing machine frame and the sewing machine frame 5. Although not shown, in the existing sewing machine frame, the base middle plate and the extension middle plate extend linearly in the extension direction J. The number of ribs of the existing sewing machine frame is larger than the number of ribs of the sewing machine frame 5. For the evaluation of the rigidity of the example, by fixing the parts N1 to N7 at the bottom of the base frame 6 and the column frame 4 of Figure 8 and at the front end M1 of the arm frame 8 of Figure 4 and the front end M2 of the base frame 6 respectively, the displacement amount of the sewing machine frame 5 when a load of 10 N is applied downward and forward respectively was measured using a simulator. The evaluation of the rigidity of the comparative example was carried out by the same method as the example. The sewing machine frame 5 of the example can increase the rigidity by 1.4 times under the condition of a 68% weight reduction compared with the sewing machine frame of the comparative example.

[0058] In the above embodiment, the sewing machine frame 5, the column frame 4, the base frame 6, and the arm frame 8 are respectively an example of the sewing machine frame, column frame, base frame, and extension frame of the present invention. The column plates 30 and 43 are an example of the column plate of the present invention. The first column ribs 31, 32, 39, 45, and 46 are respectively an example of the first column rib of the present invention. The second column ribs 33, 47 to 58 are respectively an example of the second column rib of the present invention. The connecting curved plates 44, the first base plate 61, the second base plate 62, the base middle plate 63, the first extension plate 81, the second extension plate 82, and the extension middle plate 83 are respectively an example of the connecting curved plate, the first base plate, the second base plate, the base middle plate, the first extension plate, the second extension plate, and the extension middle plate of the present invention. The arm ribs 86 to 89, 94 to 100 are respectively an example of the arm rib of the present invention. The holes 90 to 93 are an example of the plurality of holes of the present invention. The column lower plate 110 and the column hole 111 are respectively an example of the column lower plate and the column hole of the present invention. The end 811 is an example of the end of the first extension plate of the present invention. The end 821 is an example of the end of the second extension plate of the present invention. The length direction D, the extension direction J, the orthogonal direction W, the first direction K1, and the second direction K2 are respectively an example of the length direction, the extension direction, the orthogonal direction, the first direction, and the second direction of the present invention. The curved surfaces 831 and 832 are an example of the curved surfaces of the extension middle plate of the present invention. The curved surfaces 303, 304, 433, and 434 are an example of the curved surfaces of the column plate of the present invention. The curved surfaces 631 and 632 are an example of the curved surfaces of the base middle plate of the present invention.

[0059] The sewing machine frame 5 of the above-described embodiment has a column frame 4 and an arm frame 8. The arm frame 8 extends from the column frame 4 in an extending direction J orthogonal to the longitudinal direction D of the column frame 4. The arm frame 8 includes a first extension plate 81, a second extension plate 82, and an extension middle plate 83. The first extension plate 81 extends in the extending direction J. The second extension plate 82 is separated from the first extension plate 81 in the longitudinal direction D, faces the first extension plate 81, and extends in the extending direction J. The extension middle plate 83 extends in the extending direction J and connects the first extension plate 81 and the second extension plate 82. The extension middle plate 83 has curved surfaces 831, 832 whose cross-sectional shape perpendicular to the longitudinal direction D is curved.

[0060] The sewing machine frame 5 includes: a column frame 4; and an arm frame 8 that extends from one end of the longitudinal direction D of the column frame 4 in an extending direction J orthogonal to the longitudinal direction D. The arm frame 8 includes a first extension plate 81, a second extension plate 82, and an extension middle plate 83. The first extension plate 81 extends in the extending direction J. The second extension plate 82 is separated from the first extension plate 81 in the longitudinal direction D, faces the first extension plate 81, and extends in the extending direction J. The extension middle plate 83 extends in the longitudinal direction D and the extending direction J. The extension middle plate 83 connects the first extension plate 81 and the second extension plate 82 in the longitudinal direction D. The extension middle plate 83 has curved surfaces 831, 832. In the sewing machine frame 5 that is liable to be loaded due to the driving of the sewing machine 1, compared with the case where the extension middle plate 83 only has a flat surface, the extension middle plate 83 of the sewing machine frame 5 helps to improve the rigidity of the arm frame 8 without increasing the weight. That is, compared with the prior art, the extension middle plate 83 of the sewing machine frame 5 helps to balance rigidity and lightness.

[0061] The curved surfaces 831, 832 are curved surfaces whose cross-sectional shape perpendicular to the longitudinal direction D is curved. Compared with the case where the cross-sectional shape perpendicular to the longitudinal direction D is a flat surface, the extension middle plate 83 can improve the rigidity against the load applied in the longitudinal direction D, and thus can firmly connect the first extension plate 81 and the second extension plate 82.

[0062] When the longitudinal direction D of the column frame 4 is defined as the vertical direction, the arm frame 8 extends from the upper end of the column frame 4 in the extending direction J. The sewing machine frame 5 includes a base frame 6 that extends from the lower end of the column frame 4 in the extending direction J and faces the arm frame 8. Compared with the case where the extension middle plate 83 only has a flat surface, the extension middle plate 83 of the sewing machine frame 5 helps to improve the rigidity of the arm frame 8 that is liable to be loaded due to the driving of the sewing machine 1.

[0063] When the longitudinal direction D of the column frame 4 is defined as the vertical direction and the direction orthogonal to both the longitudinal direction D and the extending direction J is defined as the orthogonal direction W, the orthogonal direction W includes a first direction K1 and a second direction K2 opposite to the first direction K1. The contour of the end 811 of the first extension plate 81 in the first direction K1, i.e., the first extension contour, is a curve when viewed from above, and the contour of the end 821 of the second extension plate 82 in the first direction K1, i.e., the second extension contour, is a curve when viewed from above. Compared with the case where the first extension contour and the second extension contour are straight lines when viewed from above, the first extension plate 81 and the second extension plate 82 of the sewing machine frame 5 contribute to improving the rigidity of the arm frame 8.

[0064] In the first extension plate 81, the portion 814 with the shortest length in the orthogonal direction W is located closer to the extending direction J than the portion 813 with the longest length in the orthogonal direction W. In the second extension plate 82, the portion 824 with the shortest length in the orthogonal direction W is located closer to the extending direction J than the portion 823 with the longest length in the orthogonal direction W. The first extension plate 81 and the second extension plate 82 of the sewing machine frame 5 contribute to lightening the front end portion in the extending direction J of the arm frame 8.

[0065] When the longitudinal direction D of the column frame 4 is defined as the vertical direction, the arm frame 8 is an arm frame 8 that extends from the upper end of the column frame 4 in the extending direction J. The sewing machine frame 5 includes a base frame 6 that extends from the lower end of the column frame 4 in the extending direction J and faces the arm frame 8. The base frame 6 includes a first base plate 61, a second base plate 62, and a base middle plate 63. The first base plate 61 extends in the extending direction J. The second base plate 62 is separated from the first base plate 61 in the longitudinal direction D, faces the first base plate 61, and extends in the extending direction J. The base middle plate 63 extends in both the longitudinal direction D and the extending direction J and connects the first base plate 61 and the second base plate 62 in the longitudinal direction D. The base middle plate 63 has curved surfaces 631, 632 whose cross-sections perpendicular to the longitudinal direction D are curved. Compared with the case where a middle plate with a curved surface is arranged only on one of the base frame 6 and the arm frame 8, the base frame 6 and the arm frame 8 of the sewing machine frame 5 contribute to improving the rigidity of the sewing machine frame 5 without increasing the weight.

[0066] In the case where the longitudinal direction D of the column frame 4 is defined as the vertical direction, the column frame 4 has a column lower plate 110 extending in the horizontal direction orthogonal to the vertical direction at the lower end of the column frame 4, and column plates 30 and 43. A quadrangular column hole 111 that penetrates in the vertical direction and has edges 113 and 115 that are curved when viewed from below is formed in the column frame 4. The column plate 43 has a curved surface 433 extending upward from the curved edge 113. The column plate 30 has a curved surface 303 extending upward from the curved edge 115. Compared with the case where the column plates 30 and 43 are not provided, the column frame 4 of the sewing machine frame 5 helps to improve the rigidity of the column frame 4 without increasing the weight. For the column frame 4 of the sewing machine frame 5, the column plates 30 and 43 can be simply manufactured by pulling out the molding die downward.

[0067] In the case where the longitudinal direction D of the column frame 4 is defined as the vertical direction and the direction orthogonal to the longitudinal direction D and the extension direction J is defined as the orthogonal direction W, the length L6 in the orthogonal direction W at the lower end of the column frame 4 is longer than the length L5 in the orthogonal direction W at the upper end of the column frame 4. Compared with the case where the length in the orthogonal direction W at the lower end of the column frame 4 is less than or equal to the length in the orthogonal direction W at the upper end of the column frame 4, the column frame 4 of the sewing machine frame 5 helps to improve the rigidity of the column frame 4 without increasing the weight.

[0068] In the case where the direction orthogonal to the longitudinal direction D and the extension direction J is defined as the orthogonal direction W, the arm frame 8 has arm ribs 86 to 89, 94 to 100 protruding from the extension middle plate 83 in the orthogonal direction W. The column frame 4 has first column ribs 45 and 46 with a thickness Q1 and first column ribs 31, 32, and 39 with a thickness Q2 that are larger than the thicknesses F1 of the arm ribs 86 to 89, 94, and 95 and the thicknesses F2 of the arm ribs 96 to 100 in the shape of a cross section perpendicular to the orthogonal direction W. The column frame 4 has second column ribs 33 to 38 and 47 to 58. The thicknesses of the second column ribs 33 to 38 and 47 to 58 are less than the thickness Q2 of the first column ribs 31, 32, and 39 and the thickness Q1 of the first column ribs 45 and 46. The length in the longitudinal direction D of the second column ribs 33 to 38 and 47 to 58 is shorter than the length in the longitudinal direction D of the first column ribs 31, 32, 39, 45, and 46. In the sewing machine frame 5, compared with the case where the column ribs 31 to 39, 45 to 58 and the arm ribs 86 to 89, 94 to 100 have the same thickness, the column ribs 31 to 39, 45 to 58 and the arm ribs 86 to 89, 94 to 100 of the sewing machine frame 5 help to ensure the rigidity of the column frame 4 that is easily loaded with a load while reducing the thickness of the arm ribs 86 to 89, 94 to 100 to make them lighter.

[0069] When the longitudinal direction D of the column frame 4 is defined as the vertical direction and the extending direction J is defined as the left direction, the arm frame 8 has a connecting curved plate 44 that is arc-shaped in a front view below the connecting portion 40 where it is connected to the column frame 4. The first column ribs 31, 32, 39, 45, 46 are arranged on the tangent line of the connecting curved plate 44 in a front view. The column ribs of the sewing machine frame 5 contribute to ensuring the rigidity of the connecting portion 40 between the column frame 4, which is easily loaded with a load, and the arm frame 8.

[0070] The protruding amounts of the first column ribs 45, 46 in the orthogonal direction W are larger than those of the arm ribs 86 to 89, 94, 95 in the orthogonal direction W. The first column ribs 45, 46 of the sewing machine frame 5 contribute to ensuring the rigidity of the connecting portion 40 between the column frame 4, which is easily loaded with a load, and the arm frame 8.

[0071] When the direction orthogonal to the longitudinal direction D and the extending direction J is defined as the orthogonal direction W, the arm frame 8 has arm ribs 86 to 89, 94 to 100 that protrude from the extending middle plate 83 in the orthogonal direction W. The extending middle plate 83 is formed with holes 90 to 93 that penetrate in the orthogonal direction W along any one of the arm ribs 86 to 89, 94 to 100. Compared with the case where the arm frame 8 is not formed with a plurality of holes, the holes 90 to 93 of the sewing machine frame 5 contribute to lightening the weight of the arm frame 8.

[0072] When the direction orthogonal to the longitudinal direction D and the extending direction J is defined as the orthogonal direction W, the extending middle plate 83 is connected to the first extending plate 81 at portions separated from both ends of the first extending plate 81 in the orthogonal direction W. The extending middle plate 83 is connected to the second extending plate 82 at portions separated from both ends of the second extending plate 82 in the orthogonal direction W. Compared with the case where the extending middle plate 83 only has a plane, the extending middle plate 83 of the sewing machine frame 5 contributes to improving the rigidity of the arm frame 8 without increasing the weight.

[0073] When the direction orthogonal to the longitudinal direction D and the extending direction J is defined as the orthogonal direction W, the length R3 of the extending range of the extending middle plate 83 in the orthogonal direction W is less than 1 / 2 of the length L1 of the extending range of the first extending plate 81 in the orthogonal direction W and less than 1 / 2 of the length L3 of the extending range of the second extending plate 82 in the orthogonal direction W. Compared with the case where the extending middle plate 83 only has a plane, the extending middle plate 83 of the sewing machine frame 5 contributes to improving the rigidity of the arm frame 8 without increasing the weight.

[0074] The present invention is not limited to the above-described embodiments, and various modifications can be made. The sewing machine frame 5 can also be a sewing machine frame of any type of sewing machine, such as a household sewing machine, an industrial sewing machine, a multi-needle sewing machine, and an embroidery machine. The shape and size of the sewing machine frame 5 can also be appropriately changed according to the type and structure of the sewing machine 1. For example, when the sewing machine 1 does not have the projector module 20, the sewing machine frame 5 may not have the projector support plate 85. The definition of the direction of the sewing machine frame can also be appropriately changed according to the sewing machine on which the sewing machine frame is installed.

[0075] Either the base frame 6 or the arm frame 8 alone may include a middle plate with a curved surface. The column plate 30 may also not have curved surfaces 303 and 304. The column plate 43 may also not have curved surfaces 433 and 434 respectively. The extended middle plate 83, the column plates 30 and 43, and the base middle plate 63 may also have curved surfaces whose cross-sectional shapes parallel to the length direction D are curved lines. The shape of the contour of the end 811 of the first extension plate 81, i.e., the first extension contour, may also be appropriately changed. For example, it may be linear in a top view. The shape of the contour of the end 821 of the second extension plate 82, i.e., the second extension contour, may also be appropriately changed. For example, it may be linear in a top view. The end 811 of the first extension plate 81 may also be the rear end of the first extension plate 81. The end 821 of the second extension plate 82 may also be the rear end of the second extension plate 82. In the first extension plate 81, the portion 813 with the longest length in the orthogonal direction W may also be located closer to the extension direction J than the portion 814 with the shortest length in the orthogonal direction W. In the second extension plate 82, the portion 823 with the longest length in the orthogonal direction W may also be located closer to the extension direction J than the portion 824 with the shortest length in the orthogonal direction W. In the column lower plate 110, the column hole 111 may not be formed. The column hole 111 may be a polygon having only sides that are linear in a bottom view, or may have a shape with a contour composed only of curves such as an ellipse and a circle. The number and shape of the column plates 30 and 43 extending upward from the sides of the column hole 111 may also be appropriately changed. Either the column plates 30 or 43 alone may have a curved surface. The column plate 43 may not be shaped to bend above the hole 422. The column plate 30 may not be shaped to bend above the hole 423. More specifically, the extended middle plate 83, the column plate 43, and the base middle plate 63 may also be composed of a single plate with the same or similar extension ranges in the orthogonal direction W. The so-called extension ranges in the orthogonal direction W being similar to each other means, for example, that more than 90% of the extension ranges of the extended middle plate 83 and the base middle plate 63 overlap with the extension range of the column plate 43 in the orthogonal direction W. The column plate 30 may also be composed of a planar plate perpendicular to the orthogonal direction W. Compared with the case where the column plates 43 and 30 are bent according to the structure of the sewing machine 1, the extended middle plate 83, the column plates 30 and 43, and the base middle plate 63 in the above cases contribute to improving the rigidity of the sewing machine frame 5.

[0076] When the length direction D of the column frame 4 is defined as the vertical direction and the direction orthogonal to the length direction D and the extension direction J is defined as the orthogonal direction W, the length L6 of the column frame 4 at the lower end in the orthogonal direction W may also be less than or equal to the length L5 of the column frame 4 at the upper end in the orthogonal direction W.

[0077] The shapes, quantities, protruding amounts, and arrangements of the arm ribs 86 to 89 and 94 to 100 can also be appropriately changed. The arm ribs can also be formed only on one surface in the orthogonal direction W of the extending middle plate 83. The shapes, quantities, protruding amounts, and arrangements of the first upright rib and the second upright rib can also be appropriately changed. The first upright rib and the second upright rib can also be arranged only on one surface of the upright plates 30 and 43. The first upright ribs 31, 32, 45, and 46 may not be arranged on the tangent line of the connecting curved plate 44. In each of the upright plates 30 and 43, the base middle plate 63, and the extending middle plate 83, a plurality of holes penetrating in the orthogonal direction W may not be formed. The quantities, shapes, arrangements, and sizes of the holes formed in each of the upright plates 30 and 43, the base middle plate 63, and the extending middle plate 83 can also be appropriately changed. For example, they may not be formed along the ribs.

[0078] The extending middle plate 83 can also be connected to one end in the orthogonal direction W of the first extending plate 81. The extending middle plate 83 can also be connected to one end in the orthogonal direction W of the second extending plate 82. The base middle plate 63 can also be connected to one end in the orthogonal direction W of the first base plate 61. The base middle plate 63 can also be connected to one end in the orthogonal direction W of the second base plate 62. The length of the extending range of the extending middle plate 83 in the orthogonal direction W can also be 1.2 times or less the thickness of the extending middle plate 83, can also be 1 / 2 or more the length of the extending range of the first extending plate 81 in the orthogonal direction W, and can also be 1 / 2 or more the length of the extending range of the second extending plate 82 in the orthogonal direction W.

[0079] Reference Numeral Explanation

[0080] 4: Upright Frame; 5: Sewing Machine Frame; 6: Base Frame; 8: Arm Frame; 30, 43: Upright Plates; 31, 32, 39, 45, 46: First Upright Ribs; 33 to 38, 47 to 58: Second Upright Ribs; 44: Connecting Curved Plate; 61: First Base Plate; 62: Second Base Plate; 63: Base Middle Plate; 81: First Extending Plate; 82: Second Extending Plate; 83: Extending Middle Plate; 86 to 89, 94 to 100: Arm Ribs; 90 to 93: Holes; 110: Lower Upright Plate; 111: Upright Hole; 112 to 115: Sides; 811, 821: Ends; 813, 814, 823, 824: Parts; D: Length Direction; J: Extending Direction; W: Orthogonal Direction.

Claims

1. A sewing machine frame, characterized in that, Comprising: A column frame; and An extension frame extending from one end of the column frame in the longitudinal direction thereof to an extension direction orthogonal to the longitudinal direction, The extension frame having: A first extension plate extending in the extension direction; A second extension plate separated from the first extension plate in the longitudinal direction, opposed to the first extension plate, and extending in the extension direction; And An extension middle plate extending in the longitudinal direction and the extension direction, connecting the first extension plate and the second extension plate in the longitudinal direction, and having a curved surface.

2. The sewing machine frame according to claim 1, wherein The curved surface is a curved surface whose shape of a cross-section perpendicular to the longitudinal direction is a curve.

3. The sewing machine frame according to claim 1, wherein When the longitudinal direction of the column frame is defined as the vertical direction, The extension frame is an arm frame extending from the upper end of the column frame in the extension direction, The sewing machine frame further comprises a base frame which extends from the lower end of the column frame in the extension direction and is opposed to the extension frame.

4. The sewing machine frame according to claim 1, wherein When the longitudinal direction of the column frame is defined as the vertical direction and the direction orthogonal to the longitudinal direction and the extension direction respectively is defined as the orthogonal direction, The orthogonal direction includes a first direction and a second direction opposite to the first direction, The contour of the end portion of the first extension plate in the first direction, i.e., the first extension contour, is a curve when viewed from above, The contour of the end portion of the second extension plate in the first direction, i.e., the second extension contour, is a curve when viewed from above.

5. The sewing machine frame according to claim 4, wherein In the first extension plate, the portion with the shortest length in the orthogonal direction is located closer to the extension direction than the portion with the longest length in the orthogonal direction, In the second extension plate, the portion with the shortest length in the orthogonal direction is located closer to the extension direction than the portion with the longest length in the orthogonal direction.

6. The sewing machine frame according to claim 1, wherein When the longitudinal direction of the column frame is defined as the vertical direction, The extension frame is an arm frame extending from the upper end of the column frame in the extension direction, The sewing machine frame further comprises a base frame which extends from the lower end of the column frame in the extension direction and is opposed to the extension frame, The base frame having: A first base plate extending in the extension direction; A second base plate separated from the first base plate in the longitudinal direction, opposed to the first base plate, and extending in the extension direction; And A base middle plate extending in the longitudinal direction and the extension direction, connecting the first base plate and the second base plate in the longitudinal direction, and having a curved surface whose shape of a cross-section perpendicular to the longitudinal direction is a curve.

7. The sewing machine frame according to claim 1, wherein When the longitudinal direction of the column frame is defined as the vertical direction, The column frame has: A column lower plate at the lower end of the column frame, extending in a horizontal direction orthogonal to the vertical direction, and formed with a quadrangular column hole that penetrates in the vertical direction and has a bent edge when viewed from above; and A column plate having a curved surface extending upward from the bent edge.

8. The sewing machine frame according to claim 1, wherein When the longitudinal direction of the column frame is defined as the vertical direction and the direction orthogonal to the longitudinal direction and the extending direction is defined as the orthogonal direction, The length of the column frame in the orthogonal direction at the lower end is longer than the length of the column frame in the orthogonal direction at the upper end.

9. The sewing machine frame according to claim 1, wherein When the direction orthogonal to the longitudinal direction and the extending direction is defined as the orthogonal direction, The extension frame has an arm rib protruding from the extension middle plate in the orthogonal direction, The column frame has: a first column rib having a thickness larger than that of the arm rib in the shape of a cross-section perpendicular to the orthogonal direction; and a second column rib having a thickness smaller than that of the first column rib and a shorter length in the longitudinal direction than the first column rib.

10. The sewing machine frame according to claim 9, wherein When the longitudinal direction of the column frame is defined as the vertical direction and the extending direction is defined as the left direction, The column frame has a connecting curved plate that is arc-shaped in a front view below the connecting portion connected to the extension frame, The first column rib is arranged on the tangent line of the connecting curved plate in a front view.

11. The sewing machine frame according to claim 10, wherein The protruding amount of the first column rib in the orthogonal direction is larger than the protruding amounts of the arm rib and the second column rib.

12. The sewing machine frame according to claim 1, wherein When the direction orthogonal to the longitudinal direction and the extending direction is defined as the orthogonal direction, The extension frame has an arm rib protruding from the extension middle plate in the orthogonal direction, The extension middle plate is formed with a plurality of holes that penetrate in the orthogonal direction along the arm rib.

13. The sewing machine frame according to claim 1, wherein When the direction orthogonal to the longitudinal direction and the extending direction is defined as the orthogonal direction, The extension middle plate is connected to the first extension plate at portions separated from both ends of the first extension plate in the orthogonal direction, The extension middle plate is connected to the second extension plate at portions separated from both ends of the second extension plate in the orthogonal direction.

14. The sewing machine frame according to claim 1, wherein When the direction orthogonal to the longitudinal direction and the extending direction is defined as the orthogonal direction, The length of the extension range of the extended middle plate in the orthogonal direction is less than 1 / 2 of the length of the extension range of the first extension plate in the orthogonal direction and less than 1 / 2 of the length of the extension range of the second extension plate in the orthogonal direction.

15. A sewing machine frame, characterized in that, Comprising: A column frame; and An arm frame extending from the column frame in an extension direction orthogonal to the length direction of the column frame, The arm frame having: A first extension plate extending in the extension direction; A second extension plate separated from the first extension plate in the length direction, opposed to the first extension plate, and extending in the extension direction; And An extended middle plate extending in the extension direction, connecting the first extension plate and the second extension plate, and having a curved surface with a cross-section perpendicular to the length direction.

16. The sewing machine frame according to claim 15, wherein When defining the direction orthogonal to the length direction and the extension direction respectively as the orthogonal direction, The contour of one end of the first extension plate in the orthogonal direction, i.e., the first extension contour, is a curve, The contour of one end of the second extension plate in the orthogonal direction, i.e., the second extension contour, is a curve.

17. The sewing machine frame according to claim 15, wherein When defining the direction orthogonal to the length direction and the extension direction respectively as the orthogonal direction, In the extension direction, the part with the longest length in the orthogonal direction of the first extension plate is located between the part with the shortest length in the orthogonal direction of the first extension plate and the column frame, In the extension direction, the part with the longest length in the orthogonal direction of the second extension plate is located between the part with the shortest length in the orthogonal direction of the second extension plate and the column frame.

18. The sewing machine frame according to claim 15, wherein The sewing machine frame further comprises a base frame, which is opposed to the arm frame and extends from the column frame in the extension direction, The base frame having: A first base plate extending in the extension direction; A second base plate separated from the first base plate in the length direction, opposed to the first base plate, and extending in the extension direction; And A base middle plate extending in the extension direction, connecting the first base plate and the second base plate, and having a curved surface with a cross-section perpendicular to the length direction.

19. The sewing machine frame according to claim 15, wherein The column frame has: A column lower plate having a column hole in a quadrilateral shape that penetrates in the length direction and has a curved side; and A column plate having a curved surface extending from the curved edge of the column hole in the length direction.

20. The sewing machine frame according to claim 15, wherein When defining the direction orthogonal to the length direction and the extension direction respectively as the orthogonal direction, The extended middle plate is connected to the first extension plate between the two ends of the first extension plate in the orthogonal direction, The extended middle plate is connected to the second extended plate between two ends in the orthogonal direction of the second extended plate.

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