Thread clamping device and sewing device

Abstract

The present application provides a rotary thread clamping device capable of stably maintaining the tension of a thread, and a sewing device provided with the thread clamping device. The thread clamping device (3A) is characterized by comprising: a thread clamping plate (31) that rotates by movement of a thread wound on a winding portion; a thread clamping shaft (37) that extends in the axial direction through the center of rotation of the thread clamping plate (31); a rotating body (32) that is rotatably supported relative to the thread clamping shaft (37) and is adjacent to the thread clamping plate (31) on one side and the other side in the axial direction, the rotating body (32) rotating in correspondence with the rotation of the thread clamping plate (31); an abutting member (33) that is in contact with an outer side contact portion (S2) in the rotating body (32), the outer side contact portion (S2) being a portion on the side opposite in the axial direction to a contact portion (S1) that is in contact with the thread clamping plate (31); a pressing member (34) that presses the abutting member (33) against the rotating body (32), the rotating body (32) and the thread clamping plate (31) being subjected to a frictional load by the pressing member (34); and an adjustment member (4A) that adjusts the pressing force with which the pressing member (34) presses the abutting member (33).

Description

Technical Field

[0001] This disclosure relates to thread clamping devices and sewing devices. Background Technology

[0002] Patent Document 1 discloses a rotary thread clamping device. The rotary thread clamping device includes a rotating thread clamping plate and an abutment member. The thread is wound around the rotating thread clamping plate. The rotating thread clamping plate rotates in response to the delivery of the thread. The abutment member contacts both sides of the rotating thread clamping plate. The rotary thread clamping device applies tension to the thread through the sliding friction force exerted when the rotating thread clamping plate rotates relative to the abutment member.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-43890 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In rotary thread clamping devices, the rotating clamping plate rotates relative to the abutting member, which in turn causes wear on the abutting member. In this case, the rotary thread clamping device cannot stably maintain the tension of the thread.

[0008] The purpose of this disclosure is to provide a rotary thread clamping device that can stably maintain the tension of the thread, and a sewing device equipped with the thread clamping device.

[0009] Solution for solving the problem

[0010] The thread clamping device of the first technical solution disclosed herein is characterized in that it comprises: a thread clamping plate having a winding portion for winding thread, which is rotatable by movement of the thread wound around the winding portion; a thread clamping shaft extending axially through a rotation center of the thread clamping plate; a rotating body supported rotatably relative to the thread clamping shaft and adjacent to the thread clamping plate on at least one side of the axial direction relative to the thread clamping plate, the rotating body rotating in accordance with the rotation of the thread clamping plate; an abutting member contacting an outer contact portion in the rotating body, the outer contact portion being a portion on the opposite side in the axial direction relative to the contact portion, i.e., the inner contact portion, that contacts the thread clamping plate; a pressing member pressing the abutting member against the rotating body, applying a frictional load when the rotating body and the thread clamping plate rotate; and an adjusting member adjusting the pressing force of the pressing member against the abutting member.

[0011] The thread clamping device, by positioning a rotating body between the clamping plate and the abutment member, can suppress wear on the abutment member corresponding to the rotation of the clamping plate. Therefore, the thread clamping device can suppress variations in the frictional load applied to the clamping plate, thus stably maintaining the tension of the thread.

[0012] Alternatively, according to the first technical solution, the thread clamping plate has a suppressing portion on its contact surface that can contact the thread wound on the winding portion to suppress the slippage of the thread. The thread clamping device can use the suppressing portion to suppress the slippage of the thread relative to the winding portion.

[0013] Alternatively, according to the first technical solution, the rotating body has a first part and a second part adjacent to each other in the axial direction, the outer diameter of the first part being larger than the outer diameter of the second part, and the abutting member having a through hole through which the second part of the rotating body passes. In this case, the difference between the outer diameter and the inner diameter of the abutting member can be reduced, and the abutting member can be held from the inside of the through hole by the rotating body. Therefore, local wear and breakage of the abutting member can be reduced.

[0014] Alternatively, according to the first technical solution, the rotating body comprises a first rotating body disposed on one side of the axial direction of the thread clamping plate and a second rotating body disposed on the other side of the axial direction, and the abutting member comprises a first abutting member abutting against the first rotating body and a second abutting member abutting against the second rotating body. In this case, appropriate frictional loads can be applied relative to the thread clamping plate and the rotating body from both sides of the axial direction, thus easily maintaining an appropriate tension applied to the thread.

[0015] Alternatively, according to the first technical solution, the wire clamping device includes a bearing located between the rotating body and the wire clamping shaft. The wire clamping device enables the rotating body to rotate smoothly relative to the wire clamping shaft.

[0016] Alternatively, according to the first technical solution, the first rotating body has a first recess on the side facing the other side, and the second rotating body has a second recess on the side facing the other side. The wire clamping device also includes a bearing located between the rotating body and the wire clamping shaft, the bearing being held by the first and second recesses. In this case, a simple structure can be used to prevent debris from entering the bearing.

[0017] Alternatively, according to the first technical solution, the adjusting member at least includes a solenoid, and the pressing force is adjusted by adjusting the axial position of the pressing member in accordance with the driving of the solenoid. The adjusting member can easily adjust the magnitude of the frictional load applied to the clamping plate and the rotating body using the solenoid.

[0018] Alternatively, according to the first technical solution, the adjusting member may include at least: a handle portion, which is axially positioned opposite to the side where the abutment member is located relative to the pressing member, and the axial position of the handle portion can be adjusted; and a compression spring, which is located between the handle portion and the pressing member, wherein the pressing member presses the abutment member against the rotating body by the elastic force of the compression spring, and the adjusting member adjusts the pressing force by adjusting the axial position of the handle portion. The adjusting member can easily adjust the magnitude of the frictional load applied to the clamping plate and the rotating body by adjusting the position of the handle portion.

[0019] Alternatively, according to the first technical solution, the adjusting member includes at least a pulse motor, and the pressing force is adjusted by adjusting the axial position of the pressing member in accordance with the driving of the pulse motor. The adjusting member can easily adjust the magnitude of the frictional load applied to the clamping plate and the rotating body using the pulse motor.

[0020] The sewing apparatus of the second technical solution disclosed herein includes: the thread clamping device of the first technical solution; and a needle bar extending in a vertical direction, at the lower end of which a machine needle can be mounted, the needle bar being capable of vertical movement. According to the second technical solution, it can achieve the same effect as the first technical solution. Attached Figure Description

[0021] Figure 1 This is a three-dimensional view obtained from observing sewing machines 1A, 1B, and 1C from the front.

[0022] Figure 2 This is the main view of the head 24.

[0023] Figure 3 Viewed from the direction of the arrow Figure 2 The sectional view obtained by the AA line.

[0024] Figure 4 This is an exploded perspective view of the wire clamping device 3A.

[0025] Figure 5 The photograph was taken of the winding section 31A of the wire clamping device 3A.

[0026] Figure 6 This is a three-dimensional view of the wire clamping device 3A.

[0027] Figure 7 This is a side view of the wire clamping device 3A.

[0028] Figure 8 It is a graph showing the relationship between sewing time and the tension of the top thread 9.

[0029] Figure 9This is a graph showing the relationship between sewing time and wear on the thread clamping device 3A.

[0030] Figure 10 It is a photograph obtained by shooting the line marks.

[0031] Figure 11 This is a cross-sectional view of the wire clamping device 3B.

[0032] Figure 12 This is a 3D view of the wire clamping device 3C.

[0033] Figure 13 This is a cross-sectional view of the wire clamping device 3C.

[0034] Figure 14 This is an exploded perspective view of the wire clamping device 3C.

[0035] Figure 15 This is a diagram showing the inhibition region T2 and the inhibition region T3. Detailed Implementation

[0036] <First Implementation>

[0037] The sewing machine 1A equipped with the thread clamping device 3A of the first embodiment of the present disclosure will be described with reference to the accompanying drawings. In the following description, left and right, front and back, and up and down, as indicated by the arrows in the drawings, will be used.

[0038] <Overview of Sewing Machine 1A>

[0039] Sewing machine 1A is a door-type sewing machine capable of sewing together fabric. For example... Figure 1 As shown, the sewing machine 1A has a base portion 21, a pair of support portions 22, a beam portion 23, a head 24, and a moving mechanism 25. The base portion 21 has a base portion 21A and a frame 21B. The base portion 21A is generally rectangular in shape. A horizontally extending, flat holding surface 21U is formed on the upper surface of the base portion 21A. A holding plate 21P extending forward along the holding surface 21U is provided at the front end of the base portion 21A. A snake belly 21R extending in the front-rear direction is provided near the right end of the holding surface 21U. A snake belly 21L extending in the front-rear direction is provided near the left end of the holding surface 21U. The snake belly 21R and snake belly 21L extend in a straight line between the front and rear ends of the holding surface 21U on the front and rear sides of the pair of front-rear moving mechanisms 251, which will be described later. The snake belly 21R and snake belly 21L extend and retract in accordance with the reciprocating movement of the pair of front-rear moving mechanisms 251 in the front-rear direction. The frame 21B is a lattice-shaped structure that supports the base 21A from below.

[0040] A pair of support sections 22 include support section 22R and support section 22L. Support section 22R and support section 22L are both approximately quadrangular prisms. Support section 22R extends upward from the right end of the base section 21A of the base section 21, at a position slightly forward and past the center in the front-rear direction. Support section 22R is located to the right of the snake belly 21R in the left-right direction. Support section 22L extends upward from the left end of the base section 21A of the base section 21, at a position slightly forward and past the center in the front-rear direction. Support section 22L is located to the left of the snake belly 21L in the left-right direction. Support sections 22R and 22L are separated in the left-right direction.

[0041] A beam 23 is erected between support columns 22R and 22L. The beam 23 extends laterally between the pair of support columns 22. The beam 23 has a housing 23U. The housing 23U extends between the upper ends of each support column 22R and 22L, and between the rear ends of each support column 22R and 22L. A track 220 is provided within the space enclosed by the support columns 22R, 22L, and housing 23U. The track 220 is rod-shaped and erected between the support columns 22R and 22L. The track 220 supports the head 24 (described later) in a manner that allows it to move laterally. A snake-belly 23F is provided throughout the front ends of each support column 22R, 22L, and housing 23U, as well as the left and right ends of the head 24 (described later). The snake-belly 23F covers the track 220 supporting the head 24 from the front. The snake's abdomen 23F and head 24 reciprocate along the track 220 in the left and right directions, and extend and retract accordingly.

[0042] The head 24 is positioned at the front relative to the beam 23. The head 24 includes a needle bar 24A, a presser foot 24B, a thread take-up mechanism 24C, a thread clamping device 3A, a secondary thread clamp 26, and thread guides 27 and 28 (see reference). Figure 2 The needle bar 24A extends vertically and can be fitted with a needle (not shown) at its lower end. The needle bar 24A is movable vertically. The presser foot 24B has a through hole for the needle to pass through in accordance with the movement of the needle bar 24A, and presses the workpiece from above. Figure 2As shown, the take-up mechanism 24C and the needle bar 24A move in the up-down direction respectively, lifting the top thread 9. The thread clamping device 3A adjusts the tension of the top thread 9. A detailed description of the thread clamping device 3A is given later. The auxiliary thread clamp 26 is located on the front surface of the head 24 and above the thread clamping device 3A. The auxiliary thread clamp 26 winds the top thread 9 extending from the spool (not shown) and guides the top thread 9 toward the lower thread clamping device 3A. The guide wire 27 is located on the front surface of the head 24 and to the left of the thread clamping device 3A. The guide wire 28 is located on the front surface of the head 24 and above the thread clamping device 3A. The guide wires 27 and 28 respectively contact the top thread 9 extending from the thread clamping device 3A and guide the top thread 9 toward the take-up mechanism 24C. The track 220 inside the beam 23 supports the head 24 in a manner that allows the head 24 to move in the left-right direction. Therefore, the head 24 can move in the left-right direction along the front end of the beam 23. Below the head 24 and inside the base 21A, there is a shuttle mechanism (not shown). The shuttle mechanism has a needle plate with needle holes through which the needle passes when the needle bar 24A moves downward. The shuttle mechanism is capable of moving synchronously with the head 24 in the left-right direction.

[0043] like Figure 1 As shown, the moving mechanism 25 is located above the holding surface 21U of the base portion 21. The moving mechanism 25 enables the sewn workpiece placed on the base portion 21 to move in the front-to-back direction. The moving mechanism 25 includes a support portion 250, a lower feed plate 25B, and a pair of front-to-back moving mechanisms 251. The support portion 250 extends in the left-to-right direction between the belly portion 21R and belly portion 21L of the holding surface 21U of the base portion 21. The pair of front-to-back moving mechanisms 251 are located at the left and right ends of the support portion 250. The pair of front-to-back moving mechanisms 251 includes a front-to-back moving mechanism 251R located at the right end of the support portion 250 and a front-to-back moving mechanism 251L located at the left end of the support portion 250. The front-to-back moving mechanism 251R is connected to a belt (not shown) located below the belly portion 21R. The front-to-back moving mechanism 251L is connected to a belt (not shown) located below the belly portion 21L. A pair of forward and backward moving mechanisms 251, along with the belts connected to the forward and backward moving mechanisms 251R and 251L, cause the support portion 250 to move in the forward and backward direction. The support portion 250 is connected to the lower feed plate 25B inside the pair of forward and backward moving mechanisms 251. The lower feed plate 25B extends parallel to the holding surface 21U from near the lower part of the support portion 250 towards the front. The support portion 250 also has a cylinder (not shown) at its center in the left-right direction. The cylinder enables an upper feed plate (not shown) to move in the up-down direction. When the upper feed plate is moved downward, it can clamp the workpiece between itself and the lower feed plate 25B.

[0044] An operation unit 29 is provided at the front end of the base 21A. The operation unit 29 includes a display unit and buttons. The operation unit 29 displays the status of the sewing machine 1A via the display unit and receives input operations performed by the operator via the buttons. Inside the frame 21B is a control unit containing a control board (not shown). The control unit controls all sewing actions performed by the sewing machine 1A. For example, the control unit detects the input operations received via the operation unit 29 and controls the adjustment member 4A, which will be described later.

[0045] <Wire clamping device 3A>

[0046] like Figure 3 As shown, the wire clamping device 3A includes a wire clamping plate 31, rotating bodies 32A and 32B (collectively referred to as rotating bodies 32), abutting members 33A and 33B (collectively referred to as abutting members 33), pressing members 34A and 34B (collectively referred to as pressing members 34), a cover 35, a wire take-up spring 36, a wire clamping shaft 37, a wire clamping seat 38, a pressing shaft 39, and an adjusting member 4A. Furthermore, the front-to-back direction will be referred to as the axial direction below.

[0047] <Wire Splice 31>

[0048] like Figure 4 As shown, the clamping plate 31 has a base 311 and a winding portion 31A. The base 311 has a generally circular plate shape and is orthogonal to the axial direction. Hereinafter, the direction extending radially from the center along the plane of the base 311 will be referred to as radial. A circular through hole 310 is provided at the center of the base 311. The winding portion 31A extends outward from the peripheral end of the base 311. The winding portion 31A is composed of a plurality of first ribs Q1 and a plurality of second ribs Q2 extending in directions that intersect each other. Figure 5 As shown in (A), a plurality of first ribs Q1 are inclined forward relative to the radial direction. A plurality of second ribs Q2 are inclined backward relative to the radial direction. The first ribs Q1 and the second ribs Q2 are arranged alternately along the periphery of the base 311. The plurality of first ribs Q1 and the plurality of second ribs Q2 intersect near the base 311. The further away from the base 311, the greater the axial spacing between the plurality of first ribs Q1 and the plurality of second ribs Q2. Metal can be used as the material for the clamping plate 31.

[0049] Line 9 (refer to) Figure 2 The surface 9 is wound around the winding portion 31A in a state of contact with the rear surfaces of the plurality of first ribs Q1 and the front surfaces of the plurality of second ribs Q2 (hereinafter referred to as contact surfaces P). At this time, the surface line 9 extends in a serrated state through the plurality of first ribs Q1 and the plurality of second ribs Q2. Figure 5As shown in (B), a suppressing portion T1 is provided on the contact surface P to suppress the sliding of the surface line 9. The suppressing portion T1 consists of a plurality of grooves extending parallel to each other. Each groove extends concentrically with respect to the center of the base 311. The radial spacing of the plurality of grooves is uniform. The spacing between each of the plurality of grooves is set to any value between 10 μm and 100 μm. In this embodiment, the spacing is 0.1 mm. The plurality of grooves are formed on the contact surface P by laser irradiation. Each groove extends concentrically with respect to the center of the base 311.

[0050] like Figure 5 As shown in (C), a surface curing treatment based on heat treatment or the like is performed on the contact surface P. Furthermore, multiple grooves formed by laser irradiation are formed on the cured layer created by the surface curing treatment without damaging the cured layer. Figure 5 As shown in (D), multiple scum with an outer diameter of several μm are formed in multiple grooves formed by laser irradiation.

[0051] <Spool 37>

[0052] like Figure 4 As shown, the clamping shaft 37 is generally cylindrical and extends along the axial direction. The clamping shaft 37 has a base shaft portion 37A and a pair of segmented shaft portions 37B.

[0053] The base shaft portion 37A is cylindrical and extends axially. The base shaft portion 37A has a first base shaft portion 371 and a second base shaft portion 372 with different diameters. The diameter of the first base shaft portion 371 is slightly larger than the diameter of the second base shaft portion 372. The first base shaft portion 371 is adjacent to the second base shaft portion 372 on its front side relative to the second base shaft portion 372. Figure 3 As shown, a through hole 370 is provided at the center of the base shaft portion 37A. The through hole 370 has a circular cross-sectional shape and extends through the base shaft portion 37A along the axial direction. The through hole 370 allows the pressing shaft 39, which will be described later, to pass through.

[0054] like Figure 4 As shown, a pair of segmented shaft portions 37B extend forward from the portion of the front end of the base shaft portion 37A where the opening of the through hole 370 is not formed. The cross-sectional shape of each segmented shaft portion 37B when cut with a plane orthogonal to the axial direction is arc-shaped. The planar portions of each pair of segmented shaft portions 37B face each other in a direction orthogonal to the axial direction. The center and diameter of the virtual cylindrical portion passing through the curved portion of each pair of segmented shaft portions 37B are respectively referred to as the center and diameter of the pair of segmented shaft portions 37B. The diameter of the pair of segmented shaft portions 37B is smaller than the diameter of the through hole 310 of the clamping plate 31. The pair of segmented shaft portions 37B axially penetrate the through hole 310 of the clamping plate 31, supporting the clamping plate 31 in a rotatable manner. The centers of the base shaft portion 37A and the pair of segmented shaft portions 37B each pass through the rotation center of the clamping plate 31.

[0055] <Rotational Body 32>

[0056] like Figure 3 , Figure 4 As shown, rotating body 32A is adjacent to the clamping plate 31 on the front side, and rotating body 32B is adjacent to the clamping plate 31 on the rear side. Rotating bodies 32A and 32B have approximately the same shape. The following detailed description uses rotating body 32A as an example, omitting a detailed description of rotating body 32B.

[0057] like Figure 4 As shown, the rotating body 32A has a first part 321 and a second part 322. The first part 321 and the second part 322 are both circular plates with a predetermined thickness, orthogonal to the axial direction. The first part 321 and the second part 322 are adjacent in the axial direction. The outer diameter of the first part 321 is larger than the outer diameter of the second part 322. Furthermore, the material of the rotating body 32A is not particularly limited; for example, resin (POM, fluororesin, etc.) or metal (stainless steel, heat-treated steel, the same material as the wire clamp 31, etc.) can be used.

[0058] A circular through-hole 320 is provided at the center of the rotating body 32A. The through-hole 320 extends axially through the rotating body 32A between the front end of the first part 321 and the rear end of the second part 322. Figure 3 As shown, the surface of the first part 321 opposite to the side adjacent to the second part 322 in the axial direction is called the inner contact part S1. A recess 320A is provided around the opening of the through hole 320 in the inner contact part S1, recessed towards the second part 322. The cross-sectional shape of the recess 320A is circular, and it has a diameter larger than the diameter of the through hole 320. The surface of the first part 321 opposite to the side opposite to the inner contact part S1 in the axial direction is called the outer contact part S2.

[0059] Rotating bodies 32A and 32B are configured such that their respective inner contact portions S1 face the wire clamping plate 31. The inner contact portions S1 of each of the rotating bodies 32A and 32B contact the base 311 of the wire clamping plate 31 from both axial sides. Thus, the rotating bodies 32A and 32B clamp the wire clamping plate 31 from both axial sides. The rotating bodies 32A and 32B hold the bearing 30 within the area surrounded by their respective recesses 320A. The bearing 30 is located between the rotating bodies 32A and 32B and the wire clamping shaft 37 that passes through the through holes 320 of each of the rotating bodies 32A and 32B. Therefore, the rotating bodies 32A and 32B are rotatably supported by the wire clamping shaft 37 by means of the bearing 30 and can rotate as the wire clamping plate 31 rotates.

[0060] <Abutting Component 33>

[0061] The abutting members 33A and 33B are generally plate-shaped and circular, orthogonal to the axial direction. Each abutting member 33A and 33B has a circular through hole 330 at its center, sufficiently large compared to the diameter of the clamping shaft 37. For example... Figure 3 As shown, the second part 322 of the rotating body 32A passes through the through hole 330 of the abutment member 33A. The abutment member 33A is adjacent to the first part 321 of the rotating body 32A on the front side, and the abutment member 33A contacts the outer contact part S2 of the rotating body 32A. The second part 322 of the rotating body 32B passes through the through hole 330 of the abutment member 33B. The abutment member 33B is adjacent to the first part 321 of the rotating body 32B on the rear side, and the abutment member 33B contacts the outer contact part S2 of the rotating body 32B. The material of the abutment member 33 is not particularly limited. As an example, woven or nonwoven fabrics (felt) of carbon, ceramic, resin (e.g., POM, fluororesin, polyamide, polyimide, polyamide-imide, polyacetal, oleoresin, etc.), or fibrous materials (e.g., fluorofiber, glass fiber, steel fiber, carbon fiber, etc.) are used. In addition, they can be used in the form of monomers and composites, depending on the required improvement in friction, durability, and operability.

[0062] <Pressing component 34>

[0063] like Figure 3 , Figure 4 As shown, pressing member 34A is adjacent to abutting member 33A on the front side, and pressing member 34B is adjacent to abutting member 33B on the rear side. Pressing members 34A and 34B have the same shape. The following detailed description uses pressing member 34B as an example, omitting a detailed description of pressing member 34A.

[0064] like Figure 4 As shown, the pressing member 34B has a base 341. The base 341 is a circular plate with a predetermined thickness, orthogonal to the axial direction. A recess 342 is provided on the side of the base 341 adjacent to the abutting member 33B. The cross-sectional shape of the recess 342 is circular. The side of the base 341 adjacent to the abutting member 33B is referred to as the inner contact portion S3. The diameter of the recess 342 is slightly larger than the diameter of the second portion 322 of the rotating body 32B. A pair of through holes 340 are provided at the bottom of the recess 342. The cross-sectional shape of each of the pair of through holes 340 is the same as the cross-sectional shape of each of the pair of split shaft portions 37B of the clamping shaft 37.

[0065] like Figure 3As shown, the pressing member 34A is configured such that its inner contact portion S3 faces the abutting member 33A. The inner contact portion S3 of the pressing member 34A contacts the abutting member 33A. The pressing member 34A presses the abutting member 33A against the first part 321 of the rotating body 32A. The second part 322 of the rotating body 32A is disposed in the region inside the recess 342 of the pressing member 34A. Similarly, the pressing member 34B is configured such that its inner contact portion S3 faces the abutting member 33B. The inner contact portion S3 of the pressing member 34B contacts the abutting member 33B. The second part 322 of the rotating body 32B is disposed in the region inside the recess 342 of the pressing member 34B. The pressing member 34B presses the abutting member 33B against the first part 321 of the rotating body 32B.

[0066] A pair of segmented shaft portions 37B of the wire clamping shaft 37 axially penetrate through a pair of through holes 340 in the pressing members 34A and 34B, respectively. The front ends of the pair of segmented shaft portions 37B protrude forward from the pair of through holes 340 in the pressing member 34A. The pressing members 34A and 34B are held in place by the wire clamping shaft 37. The rotation of the pressing members 34A and 34B is suppressed by the wire clamping shaft 37. Furthermore, as described above, the wire clamping plate 31 and the rotating bodies 32A and 32B are rotatable relative to the wire clamping shaft 37. Therefore, by pressing the abutment members 33A and 33B against the rotating bodies 32A and 32B, the pressing members 34A and 34B can apply a frictional load to the rotation of the wire clamping plate 31 and the rotating bodies 32A and 32B.

[0067] <Cover 35>

[0068] like Figure 4 As shown, the cover 35 is a so-called fixed sleeve, adjacent to the pressing member 34A on the front side. The cover 35 has a cylindrical base 351. The base 351 extends axially. A through hole 350 extending axially is provided at the center of the base 351. The base 351 has a slit 352 extending axially along its side. The slit 352 extends through the through hole 350. The base 351 also has a screw 35B for adjusting the spacing of the slit 352. The spacing of the slit 352 and the diameter of the through hole 350 can be adjusted accordingly to the degree of thread engagement of the screw 35B.

[0069] like Figure 3As shown, a portion of one of the two segmented shaft portions 37B of the wire clamping shaft 37 protrudes forward from the pressing member 34A within the through hole 350. The shaft fixing member 35A engages from the front end of the pair of segmented shaft portions 37B disposed inside the through hole 350. In this state, the wire clamping shaft 37 is prevented from disengaging from the wire clamping plate 31, the rotating body 32A, the rotating body 32B, and the pressing members 34A and 34B by reducing the diameter of the through hole 350 using the screw 35B.

[0070] <Thread take-up spring 36, thread clamp 38>

[0071] like Figure 4 As shown, the take-up spring 36 has a winding spring portion 36A and a line hook portion 36B. The winding spring portion 36A is a torsion spring, with an inner cavity extending axially. The winding spring portion 36A is wound around the first base shaft portion 371 of the base shaft portion 37A of the wire clamping shaft 37 (see reference). Figure 3 The hook portion 36B extends from one end of the wire wound around the spring portion 36A. The hook portion 36B is bent to hook the surface wire 9 (see reference). Figure 2 ).

[0072] The clamp 38 has a cylindrical base 381. The base 381 extends axially. Figure 3 As shown, the base 381 is adjacent to the pressing member 34B on the rear side relative to the pressing member 34B. A through hole 380 extending axially is provided at the center of the base 381. A recess 38A (see reference) is provided around the opening of the through hole 380 on the front surface of the base 381. Figure 4 The recess 38A has a circular cross-sectional shape. The base 381 also has a slit 382 extending along its side in the winding direction. The slit 382 extends into the recess 38A.

[0073] The base shaft portion 37A of the wire clamping spool 37 passes through the through hole 380. In this state, the rear end of the base shaft portion 37A protrudes slightly rearward than the rear end of the wire clamping seat 38. Furthermore, a pair of split shaft portions 37B of the wire clamping spool 37 protrude forward from the front end of the wire clamping seat 38. The winding spring portion 36A of the take-up spring 36 wound around the base shaft portion 37A of the wire clamping spool 37 is disposed inside the recess 38A. The line hook portion 36B of the take-up spring 36 protrudes outward from the inside of the recess 38A via the slit 382.

[0074] The thread clamp 38 is fixed to a recess 241 provided on the front surface of the head 24 of the sewing machine 1A. The thread clamp 38 holds the thread clamping device 3A in the head 24. With the thread clamp 38 fixed in the head 24, the thread clamping plate 31, the rotating body 32A, the rotating body 32B, the abutting member 33A, the abutting member 33B, the pressing member 34A, the pressing member 34B, and the cover 35 protrude forward from the front surface of the head 24.

[0075] <Pressing Shaft 39>

[0076] like Figure 3 As shown, the pressing shaft 39 is cylindrical and passes through a through hole 370 in the base shaft portion 37A of the clamping shaft 37. The pressing shaft 39 is supported in a manner that allows it to move axially relative to the clamping shaft 37. The front end of the pressing shaft 39 protrudes slightly forward relative to the front end of the base shaft portion 37A and contacts the rear end of the pressing member 34B. The rear end of the pressing shaft 39 protrudes slightly rearward relative to the rear end of the base shaft portion 37A.

[0077] <Adjusting Component 4A>

[0078] like Figures 3-7 As shown, the adjusting member 4A is positioned at the rear relative to the clamp seat 38. (As indicated...) Figure 6 , Figure 7 As shown, the adjusting member 4A has a solenoid 41 and a rod 42. The solenoid 41 has a coil and a plunger inside a cylindrical frame 411. A portion of the front end of the plunger protrudes forward from the front end of the frame 411. The rod 42 is a rod-shaped extension along the axial direction. The rear end of the rod 42 contacts the portion of the plunger in the solenoid 41 that protrudes forward from the frame 411.

[0079] like Figure 3 As shown, the frame 411 of the solenoid 41 is assembled to the rear end of the head 24 of the sewing machine 1A via an assembly tool 41A. The rod 42 is disposed in a manner that allows it to move axially within the through hole 240 that extends axially through the head 24. The front end of the rod 42 contacts the rear end of the pressing shaft 39 from the rear.

[0080] Adjusting member 4A drives the plunger axially in accordance with the energization state of the coil relative to solenoid 41, causing rod 42 to move axially. Corresponding to the axial movement of rod 42, pressing shaft 39 also moves, changing the axial position of pressing member 34B, which contacts the front end of pressing shaft 39. At this time, the pressing force exerted by pressing members 34A and 34B on abutting members 33A and 33B from both sides axially changes. Furthermore, the greater the pressing force exerted by pressing members 34A and 34B on abutting members 33A and 33B, the greater the frictional load applied by abutting members 33A and 33B when clamping plate 31 and rotating bodies 32A and 32B rotate.

[0081] Here, the adjusting member 4A can adjust the axial movement of the plunger in accordance with the current flowing through the coil. That is, the adjusting member 4A can adjust the position of the pressing member 34B, which moves axially using the rod 42 and the pressing shaft 39, by adjusting the amount of plunger movement. In this case, the pressing force of the pressing members 34A and 34B on the abutting members 33A and 33B can also be adjusted. Therefore, the frictional load applied by the abutting members 33A and 33B when the clamping plate 31 and the rotating bodies 32A and 32B rotate can also be adjusted.

[0082] <Operating Summary of Sewing Machine 1A>

[0083] The operator operates the button on the operation unit 29 to input the tension level applied to the opposite thread 9 using the thread clamping device 3A. The control unit of the sewing machine 1A supplies current corresponding to the input tension level to the coil of the solenoid 41 of the adjusting member 4A. As a result, the plunger and lever 42 of the adjusting member 4A move axially by an amount corresponding to the current. Corresponding to the axial movement of the lever 42, the pressing shaft 39 and the pressing member 34B also move, and the axial position of the pressing member 34B changes. As a result, the pressing force of the pressing members 34A and 34B against the abutting members 33A and 33B changes.

[0084] The operator positions the workpiece below the head 24 of the sewing machine 1A. The control unit of the sewing machine 1A controls the movement mechanism 25, driving a cylinder (not shown) located on the support 250 to clamp the workpiece between the upper feed plate and the lower feed plate 25B. When the operator inputs a sewing start instruction via the operation unit 29, the control unit of the sewing machine 1A moves the needle bar 24A of the head 24 vertically. The needle, located on the needle bar 24A, moves vertically together with the needle bar 24A. The thread take-up mechanism 24C of the head 24 and the shuttle mechanism within the base 21 operate in conjunction with the needle bar 24A. The sewing machine 1A sews the workpiece using the top thread 9 passing through the needle and the bottom thread housed in the shuttle mechanism.

[0085] During the sewing process, the top thread 9 is fed from the spool. The top thread 9 contacts the auxiliary thread clamp 26, the thread clamping device 3A, the thread guide 27, the thread guide 28, and the thread take-up mechanism 24C while moving towards the needle. For example... Figure 2 As shown, the clamping plate 31 of the clamping device 3A moves clockwise (in the direction of arrow Y2) in accordance with the movement of the wound surface thread 9 (arrow Y1) when viewed from the front. At this time, the rotating bodies 32A and 32B, which are in contact with the clamping plate 31, also rotate in accordance with the rotation of the clamping plate 31.

[0086] Furthermore, by applying a pressing force corresponding to the tension input by the operator via the operating part 29 to the abutting members 33A and 33B using pressing members 34A and 34B, the abutting members 33A and 33B are pressed against the rotating bodies 32A and 32B. Therefore, the abutting members 33A and 33B apply a frictional load in an anti-rotation direction to the rotating bodies 32A and 32B. Simultaneously, the rotating bodies 32A and 32B apply a frictional load in an anti-rotation direction to the clamping plate 31 in contact with the rotating bodies 32A and 32B. Corresponding to the suppression of rotation of the clamping plate 31, tension is applied to the surface thread 9.

[0087] Furthermore, the pressing force of the pressing members 34A and 34B against the abutting members 33A and 33B is adjusted using the adjusting member 4A, corresponding to the tension level input by the operator via the operating unit 29. Therefore, the frictional load applied to the wire clamping plate 31 by the abutting members 33A and 33B via the rotating bodies 32A and 32B is also adjusted accordingly to the tension level input by the operator via the operating unit 29. As a result, the tension desired by the operator acts on the surface wire.

[0088] Furthermore, in the sewing machine 1A, the abutting members 33A and 33B apply a frictional load to the rotation of the thread clamping plate 31 via the rotating bodies 32A and 32B. Here, the thread clamping plate 31 and the rotating bodies 32A and 32B can rotate independently of each other. In this case, compared to the case where the abutting members 33A and 33B directly contact the thread clamping plate 31 to apply the frictional load, the wear of the abutting members 33A and 33B can be suppressed. Additionally, since a large through hole 330 is formed in the center of the abutting members 33A and 33B, the difference between the inner and outer diameters is small, and the force applied to the surfaces of the abutting members 33A and 33B by rotation does not produce a significant difference. Furthermore, the second part 322 of the rotating body 32A and the rotating body 32B passes through the through hole 330 of the abutting member 33A and the abutting member 33B. Therefore, the abutting member 33A and the abutting member 33B are held in place by the rotating body 32A, thus reducing the radial offset of the abutting member 33A and the abutting member 33B. This reduces localized wear and breakage of the abutting member 33A and the abutting member 33B.

[0089] <First Embodiment>

[0090] Figure 8 This is a graph comparing the tension of the top thread when sewing was performed using the sewing machine 1A of this embodiment and a conventional sewing machine. The horizontal axis represents sewing time. The vertical axis represents the tension of the top thread. Figure 8The results show that the tension of the thread in conventional sewing machines tends to increase from the very beginning of sewing, while the tension of the thread in sewing machine 1A tends to change at a certain level even after sewing time. Therefore, it can be concluded that by using sewing machine 1A equipped with thread clamping device 3A, the increase in thread tension can be suppressed compared to conventional sewing machines.

[0091] <Second Embodiment>

[0092] Figure 9 This is a graph showing the wear amount of the abutting members 33A and 33B when sewing is performed using the sewing machine 1A of this embodiment. The horizontal axis represents the sewing time. The vertical axis represents the wear amount as the change in the axial thickness of the abutting members 33A and 33B. Furthermore, the change in the thickness of the abutting members 33A and 33B was determined by measuring the overall axial thickness of the thread clamping device 3A (the distance between the pressing members 34A and 34B). Figure 9 The results show that even after approximately 2000 hours of sewing, the wear of the abutting components 33A and 33B in sewing machine 1A is significantly lower than the wear limit (-0.9 mm) that sewing machine 1A can perform. This result indicates that by using sewing machine 1A, even with a sewing time of approximately 2000 hours, the tension applied to the thread by the thread clamping device 3A can be stably maintained.

[0093] <Third Embodiment>

[0094] Figure 10 This shows the results of comparing the stitches produced when the sewing machine 1A of this embodiment was used with the stitches produced when a conventional sewing machine was used. According to... Figure 10 The results confirmed that thread untwisting occurred in the stitches produced by conventional sewing machines, while no untwisting occurred in the stitches produced by sewing machine 1A. Furthermore, it is speculated that the untwisting was caused by the slippage of the top thread 9 relative to the thread clamping plate 31 during sewing. Therefore, this result shows that the slippage of the top thread 9 relative to the contact surface P of the thread clamping plate 31 formed on the sewing machine 1A can be effectively suppressed by utilizing the suppressing portion T1. Therefore, it can be seen that by using the sewing machine 1A equipped with the thread clamping device 3A, well-finished stitches can be formed.

[0095] <Function and Effects of the First Embodiment>

[0096] The wire clamping device 3A, by positioning rotating bodies 32A and 32B between the wire clamping plate 31 and the abutting members 33A and 33B, can suppress wear of the abutting members 33A and 33B corresponding to the rotation of the wire clamping plate 31. Therefore, the wire clamping device 3A can suppress changes in the frictional load applied to the wire clamping plate 31 due to wear of the abutting members 33A and 33B, thus stably maintaining the tension of the surface thread 9.

[0097] The thread clamping plate 31 has a suppressing portion T1 on its contact surface P, which contacts the thread 9 wound on the winding portion 31A, to suppress the slippage of the thread 9. Therefore, the thread clamping device 3A can use the suppressing portion T1 to suppress the slippage of the thread 9 relative to the winding portion 31A. Furthermore, since the thread 9 does not slip, the desired tension can be stably applied to the thread 9. Therefore, the sewing machine 1A can form a well-finished stitch on the sewn workpiece. In addition, the rotating bodies 32A and 32B are equipped with bearings 30 located between themselves and the thread clamping shaft 37. Therefore, the thread clamping device 3A can smoothly rotate the rotating bodies 32A and 32B relative to the thread clamping shaft 37.

[0098] The abutting member 33 has a through hole 330, thus the difference between the outer diameter and the inner diameter of the abutting member 33 is small. Therefore, the difference in the amount of force acting on the surface of the abutting member 33 at each location can be reduced when the wire clamping plate 31 and the rotating body 32 rotate. Furthermore, with the second part 322 of the rotating body 32 passing through the through hole 330, the abutting member 33 can be held from the inside of the through hole 330 by means of the second part 322 of the rotating body 32. Therefore, the wire clamping device 3A can reduce local wear and damage to the abutting member 33 caused by use.

[0099] The abutting member 33 has an abutting member 33A that contacts the rotating body 32A and an abutting member 33B that abuts the rotating body 32B. Therefore, the abutting member 33 can apply appropriate frictional load to the clamping plate 31 and the rotating body 32 from both sides in the axial direction, and thus, it is easy to maintain an appropriate tension applied to the surface line 9.

[0100] Recesses 320A are provided on the rear surface of rotating body 32A and the front surface of rotating body 32B. The bearing 30 is clamped from both sides axially using the recesses 320A of rotating bodies 32A and 32B respectively. In this case, the clamping device 3A can prevent debris and other contaminants from entering the bearing 30 by utilizing the simple structure of the rotating body 32.

[0101] Adjusting member 4A has a solenoid 41. Adjusting member 4A adjusts the axial position of pressing members 34A and 34B via the solenoid 41 and the plunger drive rod 42. This adjusts the pressing force when pressing members 34A and 34B press against abutting members 33A and 33B. Thus, adjusting member 4A can easily adjust the magnitude of the frictional load applied to the clamping plate 31 using the solenoid 41.

[0102] <Second Implementation>

[0103] The sewing machine 1B according to the second embodiment will be described. The sewing machine 1B uses a thread clamping device 3B (see reference). Figure 11 The wire clamping device 3B is used instead of the clamping device 3A, which differs from the first embodiment. The clamping device 3B has an adjusting member 5A (see reference 5A). Figure 11 ) is used to replace the adjusting component 4A. In the sewing machine 1B, the structure is the same as that of the sewing machine 1A except for the adjusting component 5A, so the description is omitted.

[0104] like Figure 11 As shown, the adjusting member 5A is positioned rearward relative to the thread clamp 38. The adjusting member 5A includes a pulse motor 51, a lever 52, and a lever 53. The pulse motor 51 is mounted to the rear end of the head 24 of the sewing machine 1B via an assembly tool 51A. The pulse motor 51 internally rotates the hollow rotor. Threads are formed on the inner surface of the hollow rotor. The lever 52 is a ball screw that engages with the threads on the inner surface of the hollow rotor. The lever 52 moves in the front-to-back direction due to the rotation of the hollow rotor. The front end of the lever 52 protrudes forward from the pulse motor 51. The lever 53 is disposed in a through hole 240 that axially penetrates the head 24. The rear end of the lever 53 contacts the front end of the lever 52 from the front. The front end of the lever 53 contacts the rear end of the pressing shaft 39 from the rear.

[0105] The control unit of sewing machine 1B outputs a pulse signal to the pulse motor 51 of the adjusting member 5A. The pulse motor 51 rotates the hollow rotor in response to the input pulse signal, causing the front end of rod 52 to move axially. In this case, rod 53, adjacent to the front end of rod 53, moves axially within the through hole 240, changing the axial position of the pressing shaft 39 and pressing member 34B that are in contact with the front end. At this time, the pressing force exerted by pressing members 34A and 34B on the abutting members 33A and 33B changes. Consequently, a frictional load is applied by the abutting members 33A and 33B when the thread clamping plate 31 and the rotating bodies 32A and 32B rotate.

[0106] For example, the operator operates the button on the operation unit 29 to input the tension level applied to the thread 9 using the thread clamping device 3B. The control unit of the sewing machine 1B outputs a pulse signal corresponding to the input tension level to the pulse motor 51 of the adjustment member 5A. The pulse motor 51 rotates the hollow rotor, causing the lever 52 to move axially by an amount corresponding to the pulse signal. The lever 53 moves axially in response to the movement of the lever 52, and the pressing force of the pressing member 34A and pressing member 34B against the abutting member 33A and abutting member 33B changes. As a result, the abutting member 33A and abutting member 33B apply a frictional load in the direction that inhibits the rotation of the rotating body 32A, rotating body 32B and thread clamping plate 31.

[0107] Furthermore, the frictional load applied to the rotating bodies 32A, 32B, and the clamping plate 31 by the abutment members 33A and 33B is adjusted according to the tension level input by the operator. Therefore, as the rotation of the clamping plate 31 is suppressed, the tension corresponding to the level input by the operator acts on the surface line 9. In this way, the adjusting member 5A can easily adjust the magnitude of the frictional load applied to the clamping plate 31 using the pulse motor 51.

[0108] <Third Implementation Method>

[0109] The sewing machine 1C according to the third embodiment will be described. The sewing machine 1C uses a thread clamping device 3C (see reference 3C). Figure 12 The thread clamping device 3A and thread clamping device 3B are replaced by a 3C, which differs from the first and second embodiments. In the sewing machine 1C, the structure other than the thread clamping device 3C is the same as that of the sewing machine 1A and sewing machine 1B, so the description is omitted.

[0110] like Figures 12-14 As shown, the wire clamping device 3C has an adjusting member 6A instead of adjusting members 4A and 5A, which differs from the wire clamping devices 3A and 3B. The wire clamping device 3C has the same shape as the wire clamping plate 31, rotating body 32A, rotating body 32B, bearing 30, abutting member 33A, abutting member 33B, pressing member 34A, pressing member 34B, wire take-up spring 36, and wire clamping seat 38 in the wire clamping devices 3A and 3B, respectively.

[0111] like Figure 14 As shown, the wire clamping shaft 67 has a base shaft portion 67A and a pair of segmented shaft portions 67B. The base shaft portion 67A has the same base shaft portion 37A as the wire clamping device 3A and the wire clamping device 3B (see reference). Figure 4The base shaft portion 67A has the same structure as the first base shaft portion 371 (see reference). Figure 4 The first base shaft portion 671 and the second base shaft portion 372 (see reference) correspond to Figure 4 The second base shaft portion 672 corresponding to the through hole 370 (see reference) Figure 3 The corresponding through hole 670 (refer to) Figure 13 Unlike wire clamping devices 3A and 3B, the pressing shaft 39 does not penetrate through the through hole 670. (For example...) Figure 13 As shown, the rear end of the base shaft portion 67A protrudes slightly rearward from the rear end of the wire clamp seat 38 and is held within the through hole 240 of the head 24. The wire clamp plate 31, the rotating body 32A, the rotating body 32B, the abutting member 33A, the abutting member 33B, the pressing member 34A, the pressing member 34B, and the adjusting member 6A (described later) protrude forward from the front surface of the head 24.

[0112] A pair of split shaft portions 67B are axially larger than a pair of split shaft portions 37B in wire clamping devices 3A and 3B (see reference). Figure 4 The length is [not specified]. A pair of segmented shaft portions 67B axially penetrate through a through hole 310 in the clamping plate 31, through holes 320 in each of the rotating bodies 32A and 32B, and through a pair of through holes 340 in each of the pressing members 34A and 34B. The portion of the pair of segmented shaft portions 67B including the front end protrudes forward relative to the pressing member 34A. Threaded teeth 68 are formed in the curved portion of the pair of segmented shaft portions 67B that protrudes forward from the pressing member 34A.

[0113] like Figure 12 As shown, the adjusting member 6A is positioned at the front relative to the pressing member 34A. In other words, the adjusting member 6A is axially positioned relative to the pressing member 34A and is positioned to abut against the abutting member 33A (see reference). Figure 13 , Figure 14 The opposite side of the other side. The adjusting member 6A has a handle 61, a compression spring 62 and a tray 63.

[0114] The handle portion 61 is cylindrical and extends axially. Undulated surfaces are formed on the peripheral side of the handle portion 61 to serve as anti-slip features for the operator's grip. The handle portion 61 also has an axially extending through hole 610. Threaded teeth are formed on the inner surface of the through hole 610. A pair of segmented shaft portions 67B of a clamping shaft 67 pass through the through hole 610. The threaded teeth formed on the inner surface of the through hole 610 are threadedly engaged with the threaded teeth 68 of the pair of segmented shaft portions 67B. The axial position of the handle portion 61 is changed by rotating the handle portion 61 relative to the pair of segmented shaft portions 67B.

[0115] like Figure 12 , Figure 13As shown, the compression spring 62 is axially positioned between the handle portion 61 and the pressing member 34A. Figure 13 , Figure 14 As shown, the compression spring 62 is a conical spring with a diameter that increases towards the rear. A tray 63 is positioned between the compression spring 62 and the pressing member 34A. The tray 63 is a generally circular plate orthogonal to the axial direction. The elastic force of the compression spring 62 acts on the pressing member 34A via the tray 63. This causes the pressing member 34A to move rearward, pressing the abutment member 33A against the rotating body 32A. A pair of through holes 630 are provided in the tray 63. A pair of segmented shaft portions 67B are arranged at the center of the compression spring 62 and within the pair of through holes 630 of the tray 63.

[0116] When the operator rotates and moves the handle 61 axially, the gap between the handle 61 and the tray 63 changes, and the degree of compression of the compression spring 62 also changes. At this time, the force by which the compression spring 62 presses the pressing member 34A backward through its elastic force also changes. In this case, the pressing force of the pressing members 34A and 34B against the abutment members 33A and 33B from both sides of the axial direction changes. That is, the adjusting member 6A can adjust the pressing force of the pressing members 34A and 34B against the abutment members 33A and 33B in accordance with the rotation of the handle 61 to adjust its axial position. In this case, the frictional load applied by the abutment members 33A and 33B when the clamping plate 31 and the rotating bodies 32A and 32B rotate can also be adjusted.

[0117] For example, the operator rotates the handle 61 to adjust its axial position. This changes the magnitude of the elastic force exerted by the compression spring 62 on the pressing member 34A via the tray 63, thus changing the pressing force exerted by the pressing members 34A and 34B on the abutting members 33A and 33B. Consequently, the abutting members 33A and 33B apply a frictional load that inhibits the rotation of the rotating bodies 32A and 32B, as well as the clamping plate 31.

[0118] Furthermore, the frictional load applied to the rotating bodies 32A, 32B, and clamping plate 31 by the abutment members 33A and 33B is adjusted accordingly to the amount and direction of rotation of the handle 61 when rotated by the operator. Therefore, as the rotation of the clamping plate 31 is suppressed, tension corresponding to the amount and direction of rotation of the handle 61 adjusted by the operator acts on the surface line 9. In this way, the adjusting member 6A can easily adjust the magnitude of the frictional load applied to the clamping plate 31 by adjusting the axial position of the handle 61.

[0119] <Variation Example>

[0120] This disclosure is not limited to the above-described embodiments, and various modifications are possible. Hereinafter, modifications will be described using the sewing machine 1A and the thread clamping device 3A of the first embodiment as examples, but they can also be appropriately applied to sewing machines 1B and 1C, as well as thread clamping devices 3B and 3C.

[0121] In the wire clamping device 3A, the intermediate body may be positioned between the wire clamping plate 31 and the rotating bodies 32A and 32B. In this case, the rotating bodies 32A and 32B may be adjacent to the wire clamping plate 31 but not in contact with it. The wire clamping device 3A may also have only one of the rotating bodies 32A and 32B. For example, if the wire clamping device 3A has only the rotating body 32A, the abutting member 33B may directly contact the wire clamping plate 31 from the rear. On the other hand, for example, if the wire clamping device 3A has only the rotating body 32B, the abutting member 33A may directly contact the wire clamping plate 31 from the front.

[0122] The clamping plate 31 and the rotating bodies 32A and 32B can also be bonded together using adhesives or the like. The rotating bodies 32A and 32B and the bearings can also be bonded together using adhesives or the like.

[0123] The suppression part T1 can be appropriately modified into other structures capable of suppressing the slippage of the surface line. For example, it could be, as... Figure 15 As shown in (A), the suppression part T2 has a plurality of grooves that are radially orthogonal to the center of the base 311 and extend in a straight line. Alternatively, for example, it could be as follows: Figure 15 As shown in (B), the suppression part T3 has multiple grooves extending in a straight line along the radial direction. Alternatively, in the above embodiment, multiple arc-shaped grooves are provided as concentric circles, but they may not be concentric circles but rather multiple grooves arranged as arcs with the same curvature or curves of the same shape. The grooves may also be cut into a grid pattern. Furthermore, the suppression part is not limited to being formed by laser processing of the grooves. It may also be a suppression part that can be formed with unevenness by stamping, a suppression part that roughens the surface of the contact surface P by sandblasting, or a suppression part that locally applies different materials to the surface of the contact surface P by coating agents, spraying, etc.

[0124] Alternatively, a bearing 30 can be installed on the clamping plate 31 instead of the bearing 30 installed on the rotating body 32A and rotating body 32B.

[0125] Alternatively, other mechanisms capable of adjusting the axial position of the pressing member 34B can be used instead of the solenoid 41 in the adjusting member 4A and the pulse motor 51 in the adjusting member 5A. For example, the adjusting member can also adjust the axial position of the pressing member 34B by using a linear motor to move the pressing shaft 39 axially.

[0126] Of course, the thread clamping device 3A can also be applied to sewing machines other than the gate-type sewing machine exemplified in sewing machine 1A. For example, the thread clamping device 3A can also be applied to known sewing machines (such as household sewing machines) that have a base, a support, and an arm.

[0127] <Other>

[0128] The front side is an example of "one side of the axial direction". The rear side is an example of "the other side of the axial direction". Rotating body 32A is an example of a first rotating body. Rotating body 32B is an example of a second rotating body. Abutting member 33A is an example of a first abutting member. Abutting member 33B is an example of a second abutting member. The recess 320A of rotating body 32A is an example of a first recess. The recess 320A of rotating body 32B is an example of a second recess. Sewing machine 1A, sewing machine 1B, and sewing machine 1C are examples of sewing devices.

[0129] Explanation of reference numerals in the attached figures

[0130] 1A, 1B, 1C, Sewing machine; 3A, 3B, 3C, Thread clamping device; 4A, 5A, 6A, Adjusting component; 30, Bearing; 31, Thread clamping plate; 31A, Winding part; 32, 32A, 32B, Rotating body; 33, 33A, 33B, Abutting component; 34, 34A, 34B, Pressing component; 37, 67, Thread clamping shaft; 41, Solenoid; 51, Pulse motor; 61, Handle part; 62, Compression spring; S1, Inner contact part; S2, Outer contact part; T1, T2, T3, Suppression part.

Claims

1. A wire clamping device, characterized in that, The wire clamping device has the following features: A thread clamp having a winding portion for winding thread, which can be rotated by moving the thread wound around the winding portion; A wire clamping shaft extends axially through the rotation center of the wire clamping plate; A rotating body is supported rotatably relative to the clamping shaft and is adjacent to the clamping plate on at least one side of the axial direction and the other side relative to the clamping plate. The rotating body rotates in accordance with the rotation of the clamping plate. The abutting member contacts the outer contact portion of the rotating body, which is the portion on the opposite side in the axial direction relative to the contact portion that contacts the clamping plate, i.e., the inner contact portion. The pressing member presses the abutting member against the rotating body and applies a frictional load as the rotating body and the clamping plate rotate. as well as Adjusting the component, which adjusts the pressing force of the pressing component against the abutting component.

2. The wire clamping device according to claim 1, characterized in that, The clamping plate has a suppressing portion on its contact surface that can contact the thread wound on the winding portion to suppress the slippage of the thread.

3. The wire clamping device according to claim 1 or 2, characterized in that, The rotating body has a first part and a second part that are adjacent to each other in the axial direction, wherein the outer diameter of the first part is larger than the outer diameter of the second part. The abutting member has a through hole through which the second part of the rotating body passes.

4. The wire clamping device according to any one of claims 1 to 3, characterized in that, The rotating body includes a first rotating body disposed on one side of the axial direction of the clamping plate and a second rotating body disposed on the other side of the axial direction. The abutting member includes a first abutting member that abuts against the first rotating body and a second abutting member that abuts against the second rotating body.

5. The wire clamping device according to any one of claims 1 to 4, characterized in that, The wire clamping device also includes a bearing located between the rotating body and the wire clamping shaft.

6. The wire clamping device according to claim 4, characterized in that, In the first rotating body, a first recess is provided on the surface facing the other side. In the second rotating body, a second recess is provided on the surface facing one of the directions. The wire clamping device also includes a bearing located between the rotating body and the wire clamping shaft. The bearing is held between the first recess and the second recess.

7. The wire clamping device according to any one of claims 1 to 6, characterized in that, The adjusting component includes at least a solenoid. The pressing force is adjusted by adjusting the axial position of the pressing member in accordance with the drive of the solenoid.

8. The wire clamping device according to any one of claims 1 to 6, characterized in that, The adjusting member has at least: A handle portion, positioned axially opposite to the side where the abutment member is located relative to the pressing member, allows adjustment of the axial position of the handle portion; and a compression spring is located between the handle portion and the pressing member. The pressing member presses the abutting member against the rotating body by the elastic force of the compression spring. The adjustment member adjusts the pressing force by adjusting the axial position of the handle.

9. The wire clamping device according to any one of claims 1 to 6, characterized in that, The adjustment component includes at least a pulse motor. The pressing force is adjusted by adjusting the axial position of the pressing member in accordance with the drive of the pulse motor.

10. A sewing device, characterized in that, The sewing device comprises: a thread clamping device as described in any one of claims 1 to 9; and The needle bar extends vertically and a needle can be mounted at its lower end. The needle bar is capable of moving up and down.

Images