gripping device

Abstract

The invention relates to a clamping device for fixing a part material sheet and a main material sheet to be sewn. The clamping device comprises a support plate (110) comprising at least one lower sewing hole (112) and a main material support face (114) defining a reference direction perpendicular to the main material support face, a main material presser plate (120) arranged above the support plate and comprising at least one part material receiving hole (122) for receiving a part material sheet, an upper presser plate (130) arranged above the main material presser plate and comprising at least one upper sewing hole (132). The clamping device further comprises at least one spring presser (160, 260) arranged between the upper presser plate and the main material presser plate, fixed to the upper presser plate and comprising a pressing face (165) overlapping the at least one part material receiving hole, wherein the at least one spring presser deforms in a direction in which the part material sheet is stretched when pressed between the upper presser plate and the main material presser plate.

Description

Technical Field

[0001] This invention relates to a clamping device, and more particularly to a clamping device for sewing together sheets of material to be sewn together. Background Technology

[0002] Conventionally, in order to sew two overlapping pieces of material, the two pieces of material are held in place by a clamping device, and then sewn together by a sewing machine. Figure 1A This is a top view of the sewn product 4', showing a portion of the material piece 2' sewn onto the top surface of the underlying main material piece 1' along the sewing thread 3'. (Using...) Figure 1B The clamping device 10 shown performs the operation of sewing part material sheet 2' and main material sheet 1'.

[0003] Figure 1B It is along Figure 1A A cross-sectional view taken along line 1B-1B shows the partial material sheet 2' and the main material sheet 1' being fixed in a prior art clamping device 10 before sewing. The clamping device 10 includes a support plate 110, a main material pressure plate 120, and an upper pressure plate 130. The support plate 110, which supports the main material sheet 1', has a through hole 112, hereinafter referred to as the lower sewing hole 112. The main material pressure plate 120 presses down on the main material sheet 1' and also has a through hole 122 for receiving the partial material sheet 2' therein, hereinafter referred to as the partial material receiving hole 122. The upper pressure plate 130 presses down on the edge of the partial material sheet 2', thereby fixing the partial material sheet 2' in the partial material receiving hole 122. The upper pressure plate 130 has a through hole 132, hereinafter referred to as the upper sewing hole 132. The upper sewing hole 132, the partial material receiving hole 122, and the lower sewing hole 112 are aligned vertically, allowing the sewing machine needle to pass through these holes and reciprocate, thereby sewing the partial material piece 2' to the main material piece 1'. Figure 1B In the clamping device 10, the upper sewing hole 132 is slightly narrower than the partial material receiving hole 122 in the horizontal direction, so that the upper pressure plate 130 presses down the edge of the partial material sheet 2', thereby fixing the partial material sheet 2' in a proper position within the partial material receiving hole 122. The shapes of the upper sewing hole 132, the partial material receiving hole 122, and the lower sewing hole 112 in the vertical direction can be changed to match the shape of the partial material sheet 2'.

[0004] Figure 1C This is a top view showing the glove portion 4, which includes a portion of material 2 sewn along sewing thread 3 onto the top surface of the main material sheet 1. (The last sentence appears to be incomplete and possibly refers to a different view.) Figure 1B The prior art clamping device 10 shown performs the operation of sewing part material sheet 2 and main material sheet 1. The clamping device 10 has an upper sewing hole 132, a part material receiving hole 122 and a lower sewing hole 112 with different shapes. Figure 1DThis is a top view of the clamping device 10, showing... Figure 1C Partial material sheet 2 is fixed to the main material sheet 1 before sewing. Figure 1D In the middle, when the upper pressure plate 130 presses down on the edge of part of the material sheet 2, the edge of part of the material sheet 2 (hidden part) is represented by a dashed line, while the edge of the upper sewing hole 132 of the upper pressure plate 130 is represented by a solid line.

[0005] When the clamping device 10 is used, if the material pieces 2' and 2 are made of elastic material, the tension of the top and bottom threads during sewing will cause the sewing thread to shrink, resulting in narrowing of the outer periphery of the material pieces 2' and 2, and potentially causing the material pieces 2' and 2 to bulge relative to the main material pieces 1' and 1, respectively. Furthermore, it is not possible to intentionally cause the material pieces 2' and 2 to bulge relative to the main material pieces 1' and 1, respectively.

[0006] Therefore, there is a need to provide an improved clamping device to overcome the above-mentioned defects and to intentionally bulge a portion of the material sheet relative to the main material sheet. Summary of the Invention

[0007] In view of this, the object of the present invention is to provide a clamping device for fixing and holding a partial material sheet and a main material sheet in place before sewing, which not only overcomes the defect of the partial material sheet bulging unintentionally relative to the main material sheet, but also enables the partial material sheet to bulge intentionally relative to the main material sheet.

[0008] To achieve the above objectives, the present invention provides a clamping device comprising a support plate including at least one lower sewing hole and a main material support surface, the main material support surface defining a reference direction perpendicular to the main material support surface and extending from the inner side of the support plate toward the outer side of the support plate. The clamping device further comprises a main material pressure plate disposed above the support plate in the reference direction, wherein the main material pressure plate includes at least one partial material receiving hole for receiving a portion of a material sheet, and wherein the at least one partial material receiving hole overlaps entirely with the at least one lower sewing hole in the reference direction. The clamping device further comprises an upper pressure plate disposed above the main material pressure plate in the reference direction, wherein the upper pressure plate includes at least one upper sewing hole, and wherein the at least one upper sewing hole overlaps entirely with the at least one partial material receiving hole in the reference direction. The clamping device further comprises at least one spring-loaded member disposed between the upper pressure plate and the main material pressure plate, wherein the at least one spring-loaded member is fixed to the upper pressure plate and includes a pressing surface overlapping the at least one partial material receiving hole. The at least one elastic element deforms in the direction that stretches a portion of the material sheet in response to pressure applied between the upper pressure plate and the main material pressure plate along a reference direction.

[0009] According to one embodiment, the at least one spring-loaded member deforms in a direction perpendicular to the reference direction in response to pressure between the upper pressure plate and the body material pressure plate along the reference direction.

[0010] According to one embodiment, the at least one spring-loaded member includes a friction plate attached to the pressing surface of the spring-loaded member, wherein the friction plate is made of a material with a high coefficient of friction. The material of the friction plate is selected from the group consisting of sandpaper and anti-slip rubber.

[0011] According to one embodiment, the at least one spring-loaded member includes an upper plate, a lower plate, and an elastic plate connected to the upper plate and the lower plate, wherein the elastic plate is arranged at an acute angle relative to the lower plate.

[0012] According to one embodiment, the upper plate of the at least one spring-loaded member is fixed to an upper pressure plate, and the lower plate includes a pressing surface.

[0013] According to one embodiment, the at least one spring-loaded member deforms in response to pressure in a reference direction between the upper pressure plate and the body material pressure plate, from a point on the lower plate overlapping the at least one partial material receiving hole in the reference direction to the outside of the at least one partial material receiving hole.

[0014] According to one embodiment, the at least one spring-loaded member deforms in response to pressure along a reference direction between the upper pressure plate and the body material pressure plate, from a point on the outside of the at least one partial material receiving hole that overlaps with the lower plate in the reference direction toward the inside of the at least one partial material receiving hole.

[0015] According to one embodiment, the clamping device includes at least one first spring-loaded member and at least one second spring-loaded member. The at least one first spring-loaded member deforms in response to pressure along a reference direction between the upper pressure plate and the body material pressure plate, from a point on the lower plate overlapping the at least one partial material receiving hole in the reference direction towards the outside of the at least one partial material receiving hole. The at least one second spring-loaded member deforms in response to pressure along a reference direction between the upper pressure plate and the body material pressure plate, from a point on the lower plate overlapping the at least one partial material receiving hole in the reference direction towards the inside of the at least one partial material receiving hole.

[0016] In use, the clamping device secures a main material sheet sandwiched between a support plate and a main material pressure plate, as well as a partial material sheet disposed in at least one partial material receiving hole. The at least one spring-loaded member, in response to pressure along a reference direction between the upper pressure plate and the main material pressure plate, presses the edge of the partial material sheet against its pressing surface. The materials of the main material sheet and the partial material sheet are any materials selected from the group consisting of fabrics and leather. Attached Figure Description

[0017] Referring to the accompanying drawings, the features and advantages of the present invention will be further clarified through specific embodiments, as shown in the figures:

[0018] Figure 1A It is a top view of the sewn product, showing that a portion of the material sheet is sewn onto the top surface of the main material sheet;

[0019] Figure 1B It is along Figure 1A A cross-sectional view taken along line 1B-1B shows a partial material sheet and a main material sheet being fixed in a prior art clamping device before stitching;

[0020] Figure 1C This is a top view showing the glove portion, which includes a portion of material sewn onto the top surface of the main material sheet 1;

[0021] Figure 1D This is a top view of a prior art clamping device. Figure 1C Some of the material pieces are fixed to the main material piece before sewing;

[0022] Figure 2 This is a top view of a clamping device according to an embodiment of the present invention, used to sew a partial material sheet to a main material sheet to form a... Figure 1C The glove part was previously secured;

[0023] Figure 3A and Figure 3B The clamping device moves along the non-clamping state and the clamping state respectively. Figure 2 A sectional view taken by the central line CC;

[0024] Figure 4A and Figure 4B The spring-loaded components are respectively located in Figure 3A The resting position and Figure 3B A magnified view of the compression location in the image;

[0025] Figure 5A and Figure 5B It is similar to Figure 3A and Figure 3B A cross-sectional view of a clamping device according to another embodiment of the present invention is shown;

[0026] Figure 6 This is a top view of a clamping device according to another embodiment of the present invention, wherein a portion of the material sheet and the main material sheet are fixed therein before sewing;

[0027] Figure 7A and Figure 7B It is similar to Figure 3A and Figure 3BA cross-sectional view of a clamping device according to another embodiment of the present invention is shown; and

[0028] Figure 8A and Figure 8B It is similar to Figure 5A and Figure 5B A cross-sectional view of a clamping device according to another embodiment of the present invention is shown.

[0029] List of reference numerals

[0030] 1', 1: Main material sheet; 2', 2, 20: Partial material sheet; 3: Sewing thread; 4', 4: Sewn product; 10: Clamping device of the prior art; 100, 200, 300, 400, 500: Clamping device of the present invention; 110: Support plate; 112: Lower sewing hole; 114: Main material support surface; 120: Main material pressure plate; 122: Partial material receiving hole; 130: Upper pressure plate; 32: Upper sewing hole; 160, 160.1, 160.2, 260, 260.1, 260.2, 460, 560: Spring-loaded components; 162: Upper plate of the spring-loaded component; 164: Lower plate of the spring-loaded component; 166: Elastic plate of the spring-loaded component; 165: Pressing surface of the spring-loaded component; 163: Fixed fulcrum; 170: Friction plate; 180: Pressure resistance component; a: Angle; x, x', y: Direction; rd: Rotation direction. Detailed Implementation

[0031] Figure 2 According to an embodiment of the present invention, it is used to sew together a portion of the material sheet 2 with the main material sheet 1 to form a composite material sheet. Figure 1C A top view of the clamping device 100 that is fixed in front of the glove part 4. Compared to Figure 1B and Figure 1D The clamping device 10 shown is a prior art clamping device, and the clamping device 100 of the present invention further includes a spring-loaded member 160. Figure 3A and Figure 3B The clamping device 100 moves along the non-clamping state and the clamping state respectively. Figure 2 A sectional view taken by the central line CC.

[0032] like Figure 3A and Figure 3B To show more clearly, the clamping device 100 according to the invention includes, in addition to comprising, similar to Figure 1B In addition to the structure of the clamping device 10, it also includes a spring-loaded member 160, a friction plate 170 attached to the spring-loaded member 160, and a pressure-resisting member 180. It should be noted that... Figure 2 The clamping device 100 is shown to have 11 spring-loaded elements 160, but only 2 of the spring-loaded elements 160 are marked with reference numerals.

[0033] Specifically, refer to Figure 3AThe clamping device 100 includes a support plate 110, a body material pressure plate 120, and an upper pressure plate 130. Preferably, plates 110, 120, and 130 are substantially flat. The support plate 110 includes a body material support surface 114 for supporting the body material sheet 1 thereon. The body material support surface 114 defines a reference direction y perpendicular to the body material support surface 114 and pointing from the inside of the support plate 110 toward the outside of the support plate 110, wherein, as Figure 3A As shown, the reference direction y is the vertical direction. The support plate 110 also includes a lower sewing hole 112, which is a through hole with a vertical wall, defining a reference direction x that points from a point inside the lower sewing hole 112 to the outside of the lower sewing hole 112 and is perpendicular to the reference direction y. That is, the reference direction x belongs to a plane perpendicular to the reference direction y, and points from a point inside the lower sewing hole 112 to the outside of the lower sewing hole 112, wherein, as... Figure 3A As shown, the reference direction x is horizontal. In this context, the direction x', opposite to the reference direction x, is a direction pointing from a point outside the lower sewing hole 112 to the inside of the lower sewing hole 112 and perpendicular to the reference direction y. In the following text, when a direction in the reference direction is mentioned without specifying its orientation, it means that the direction is parallel to the reference direction.

[0034] A main material pressure plate 120 is arranged above the support plate 110 to press down the main material sheet 1, which is clamped between the support plate 110 and the main material pressure plate 120. The main material pressure plate 120 includes a partial material receiving hole 122, in which a portion of the material sheet 2 is placed. Figure 2 In the figure, a portion of the material receiving hole 122 is occupied by a portion of the material sheet 2 and is not labeled. The portion of the material receiving hole 122 is a through hole with vertical walls, arranged such that the entire portion of the material receiving hole 122 overlaps with the lower sewing hole 112 in the reference direction y. It should be noted that if, for any point within the first hole, a straight line passing through that point and parallel to the reference direction passes through the second hole (intersecting it), then the entire first hole overlaps with the second hole in the reference direction.

[0035] The upper pressure plate 130 is arranged above the main material pressure plate 120 to press down and hold a portion of the material sheet 2 within the partial material receiving hole 122. The upper pressure plate 130 includes an upper sewing hole 132, which is a through hole with vertical walls, and is arranged such that the sewing hole 132 overlaps with the partial material receiving hole 122 in the reference direction y.

[0036] according to Figures 2 to 3BIn the illustrated embodiment, the partial material receiving hole 122 is slightly narrower than the lower sewing hole 112 in the horizontal direction; that is, the vertical elevation view of the partial material receiving hole 122 is similar to, but slightly narrower (i.e., smaller) than, the vertical elevation view of the lower sewing hole 112. Similarly, the upper sewing hole 132 is slightly narrower than the partial material receiving hole 122 in the horizontal direction; that is, the vertical elevation view of the upper sewing hole 132 is similar to, but slightly narrower (i.e., smaller) than, the vertical elevation view of the partial material receiving hole 122. However, in another embodiment, these holes may have the same size, i.e., the vertical elevation views of these holes are equal to and coincide with each other.

[0037] The clamping device 100 also includes a spring-loaded member 160 attached below the upper pressure plate 130. Figure 3A The spring-loaded element 160 is shown in the resting position, while Figure 3B The diagram shows the compression position of the spring-loaded member 160 when it is pressed between the upper pressure plate 130 and the main material pressure plate 120. The following will refer to... Figure 4A and Figure 4B The operation of spring-loaded component 160 is described in detail.

[0038] Figure 4A yes Figure 3A An enlarged view of the spring-loaded component 160 attached below the upper pressure plate 130 and in the resting position. (See diagram below.) Figure 4AAs shown, the spring-loaded member 160 is C-shaped or U-shaped. Specifically, the spring-loaded member 160 includes an upper plate 162 and a lower plate 164 connected together by an elastic plate 166. The upper plate 162 and the lower plate 164 are essentially flat plates, parallel to each other and parallel to the body material pressure plate 120. The upper plate 162 is fixedly attached to the underside of the upper pressure plate 130. The attachment of the upper plate 162 to the underside of the upper pressure plate 130 can be performed by any known method, such as gluing, welding, or screwing. The lower plate 164 is in a free state and has a pressing surface 165. The elastic plate 166 is arranged at an angle relative to the lower plate 164, forming an acute angle α with the lower plate 164. With this structure, when the spring-loaded member 160 is pressed between the upper pressure plate 130 and the body material pressure plate 120, i.e., when subjected to a pressing force in the reference direction, the spring-loaded member 160 will deform. Since the upper plate 162 is fixed, the elastic plate 166 will rotate about the fixed fulcrum 163 in the rotation direction rd. The fixed fulcrum 163 is the point where the elastic plate 166 abuts against the upper pressure plate 130, thereby causing the lower plate 164 to shift to the left, that is, to shift in the horizontal direction x. In this sense, the spring-loaded member 160 deforms in a direction perpendicular to the vertical direction y in response to the pressure in the vertical direction y between the upper pressure plate 130 and the main material pressure plate 120. In fact, when the spring-loaded member 160 is compressed in the vertical direction, it will deform in both the vertical and horizontal directions. However, for the sake of simplifying the description of the present invention, the horizontal displacement direction of the lower plate 164 when the spring-loaded member 160 is compressed and deformed will be referred to as the deformation direction of the spring-loaded member 160 when it is compressed.

[0039] Figure 4B yes Figure 3B An enlarged view of the spring-loaded component 160 in the compressed position. In the compressed position, due to the deformation of the spring-loaded component 160, the lower plate 164 is displaced relative to the resting position in the deformation direction (orientation in the horizontal x direction).

[0040] See also Figure 3A When the spring-loaded member 160 is in the resting position, the lower plate 164 covers a portion of the material receiving hole 122 in the vertical direction y, while the upper plate 162 does not cover a portion of the material receiving hole 122 in the vertical direction y. Hereinafter, the portion of the material receiving hole 122 covered by the lower plate 164 in the vertical direction y is referred to as the covering portion. It can be understood that the plate covers a portion of the hole in the reference direction if and only if there is at least one point on the inner side of the plate such that a straight line passing through that point and parallel to the reference direction will pass through the hole (intersect it). If, for any point on the plate, a straight line passing through that point and parallel to the reference direction does not pass through the hole (intersect it), then the plate does not cover the hole in the reference direction.

[0041] When the spring-loaded element 160 is in its maximum compressed position, the lower plate 164 is displaced to its leftmost position in the horizontal x-direction. Preferably, when the spring-loaded element 160 is in its maximum compressed position, the lower plate 164 does not cover the upper sewing hole 132 in the vertical y-direction. The pressure-resistant element 180 is provided with an appropriate thickness to ensure that the minimum distance between the main material pressure plate 120 and the upper pressure plate 130 is not less than the thickness of the pressure-resistant element 180. This means that when the pressure-resistant element 180 is sandwiched between and in contact with the main material pressure plate 120 and the upper pressure plate 130, the spring-loaded element 160 will be in its maximum compressed position. The pressure-resistant element 180 also serves to protect the spring-loaded element 160 from excessive compression to avoid damage.

[0042] It should be pointed out that, according to Figure 3A and Figure 3B In the illustrated embodiment, the friction plate 170 is also attached to the pressing surface 165 of the spring-loaded member 160. The friction plate 170 may be made of a high coefficient of friction material, such as, but not limited to, sandpaper and anti-slip rubber.

[0043] review Figure 3A and Figure 3B The operation of the spring-loaded element 160 in the clamping device 100 is as follows. Figure 3A In the first stage, the main material sheet 1 and part of the material sheet 2 are already positioned in the clamping device 100, and the upper pressure plate 130 is not yet closed, with the spring-loaded member 160 in the resting position. Then, the upper pressure plate 130 closes, so that the spring-loaded member 160 is pressed in the vertical direction y between the upper pressure plate 130 and the main material pressure plate 120. It should be noted that before the spring-loaded member 160 is compressed, because the friction plate 170 is attached to the pressing surface 165 of the lower plate 164 and a part of the lower plate 164 covers part of the material receiving hole 122 in the vertical direction y, a part of the friction plate 170 presses down the edge of part of the material sheet 2. When the spring-loaded member 160 is compressed and deformed in the vertical direction y, the lower plate 164 of the spring-loaded member 160 is displaced in the orientation of the horizontal direction x. Therefore, the friction plate 170, attached to the pressing surface 165 of the lower plate 164, also shifts in the horizontal x-direction, thus pressing down the edge of the partial material sheet 2 (at the point where the friction plate 170 overlaps with the partial material sheet 2) and simultaneously shifting in the horizontal x-direction, thereby pulling the edge of the partial material sheet 2 toward the wall of the partial material receiving hole 122 in the horizontal x-direction. In this sense, the deformation direction of the spring-loaded member 160 is from the point on the inner side of the partial material receiving hole 122 that overlaps with the lower plate 164 in the reference direction y toward the outer side of the partial material receiving hole 122, i.e., in the horizontal x-direction. A straight line passing through a point and parallel to the reference direction will pass through the plate (intersect it) if and only if that point overlaps with the plate in the reference direction.

[0044] It should be noted that because the friction plate 170 is made of a material with a high coefficient of friction, the effect of pulling the edge of the material sheet 2 is enhanced. However, in another embodiment, the effect of pulling the edge of the material sheet 2 can still be achieved without the friction plate 170.

[0045] review Figure 2 By arranging the spring-loaded member 160 around the edge of the partial material receiving hole 122 in the clamping device 100, with its deformation direction from the inside of the partial material receiving hole 122 to the outside of the partial material receiving hole 122, the edge of the partial material sheet 2 will be stretched in the direction from the inside of the partial material receiving hole 122 to the outside of the partial material receiving hole 122, thereby limiting the shrinkage of the sewing thread during sewing.

[0046] Figure 5A and Figure 5B It is similar to Figure 3A and Figure 3B A cross-sectional view of a clamping device 200 according to another embodiment of the present invention is shown, wherein Figure 5A This is a cross-sectional view of the clamping device 200 in a non-clamping state, while Figure 5B This is a cross-sectional view of the clamping device 200 in the clamping state. Figure 5A and Figure 5B The structure of the clamping device 200 and Figure 3A and Figure 3B The structure of the clamping device 100 is similar, except that the spring-loaded member 260 is arranged so that its deformation direction is from the outside of the partial material receiving hole 122 to the inside of the partial material receiving hole 122, that is, similar to... Figure 3A and Figure 3B The deformation directions of the spring-loaded member 160 are opposite. With such an arrangement of spring-loaded members 260, when the spring-loaded member 260 is compressed and deformed in the vertical direction y, the lower plate of the spring-loaded member 260 (not labeled in the figure) is displaced in the deformation direction, that is, opposite to the orientation in the horizontal direction x. In this sense, the spring-loaded member 260 deforms in a direction perpendicular to the vertical direction y in response to the pressure in the vertical direction y between the upper pressure plate 130 and the main material pressure plate 120. As a result, the friction plate 170 presses down the edge of the partial material sheet 2 (at the part where the friction plate 170 overlaps with the partial material sheet 2) and simultaneously displaces it in a direction opposite to the orientation in the horizontal direction x, thereby pushing the edge of the partial material sheet 2 in a direction from the outside of the partial material receiving hole 122 to the inside of the partial material receiving hole 122, thereby causing the partial material sheet 2 to bulge inward. In this regard, the deformation direction of the spring-loaded member 260 is from the point on the outside of the partial material receiving hole 122 that overlaps with the lower plate of the spring-loaded member 260 (not labeled in the figure) in the reference direction y, pointing towards the partial material receiving hole 122, that is, in a direction opposite to the orientation of direction x. (Review) Figure 2When the spring-loaded element 260 is used instead of the spring-loaded element 160, when the upper pressure plate 130 is closed, the spring-loaded element 260 is compressed and a portion of the material sheet 2 bulges inward.

[0047] Figure 6 This is a top view of the clamping device 300, showing the partial material sheet 20 and the main material sheet 1 fixed therein before sewing. The structure of the clamping device 300 is similar to... Figures 2 to 3B The clamping device 100 and Figure 5A and Figure 5B The clamping device 200 has a similar structure, the only difference being that the clamping device 300 is equipped with both the spring-loaded element 160 of the clamping device 100 and the spring-loaded element 260 of the clamping device 200. For example... Figure 6 As shown, the clamping device 300 includes a clamping device with ... Figure 3A and Figure 3B The spring-loaded components 160.1 and 160.2 are arranged in the same manner as the spring-loaded components 160 in the middle, and are similar to those in the middle. Figure 5A and Figure 5B The spring-loaded elements 260.1 and 260.2 are arranged in the same manner. With this arrangement, the deformation direction of the spring-loaded elements 160.1 and 160.2 is oriented in the x-direction, that is, from the inside of the partial material receiving hole 122 to the outside of the partial material receiving hole 122, thereby stretching the partial material sheet 20 at the positions of the spring-loaded elements 160.1 and 160.2. Simultaneously, the deformation direction of the spring-loaded elements 260.1 and 260.2 is in the x' direction, that is, from the outside of the partial material receiving hole 122 to the inside of the partial material receiving hole 122, thereby bulging the partial material sheet 20 inward toward the partial material receiving hole 122. Therefore, by arranging spring-loaded elements with different deformation directions at different positions, the partial material sheet 20 can be stretched or bulged as needed.

[0048] Figure 7A and Figure 7B It is similar to Figure 3A and Figure 3B A cross-sectional view of a clamping device 400 according to another embodiment of the present invention is shown, wherein Figure 7A This is a cross-sectional view of the clamping device 400 in a non-clamping state, while Figure 7B This is a cross-sectional view of the clamping device 400 in the clamping state. The structure of the clamping device 400 is similar to... Figure 3A and Figure 3BThe structure of the clamping device 100 is similar, the only difference being that the structure of the spring-loaded member 460 is different from that of the spring-loaded member 160. Specifically, the spring-loaded member 460 is Z-shaped (or S-shaped, N-shaped), rather than C-shaped (or U-shaped) like the spring-loaded member 160. With the structure of the spring-loaded member 460, when it is pressed between the upper pressure plate 130 and the main material pressure plate 120, the spring-loaded member 460 will deform in a deformation direction from the inside of the partial material receiving hole 122 to the outside of the partial material receiving hole 122. Therefore, when pressed, it will pull the edge of the partial material sheet 2 towards the wall of the partial material receiving hole 122, such as... Figure 7B As shown. Therefore, when spring-loaded component 460 is used instead... Figure 2 When the spring-loaded component 160 is in the middle, it will achieve the same as... Figure 2 The effect of the tensile portion of material sheet 2 is similar to that of the spring-loaded compression piece 160.

[0049] Figure 8A and Figure 8B It is similar to Figure 5A and Figure 5B A cross-sectional view of a clamping device 500 according to another embodiment of the present invention is shown, wherein Figure 8A This is a cross-sectional view of the clamping device 500 in a non-clamping state, while Figure 8B This is a cross-sectional view of the clamping device 500 in the clamping state. The structure of the clamping device 500 is similar to... Figure 7A and Figure 7B The structure of the clamping device 400 is similar, except that the spring-loaded member 560 is arranged so that its deformation direction is from the outside of the partial material receiving hole 122 to the inside of the partial material receiving hole 122, that is, similar to... Figure 7A and Figure 7B The deformation directions of the spring-loaded element 460 are opposite. With this arrangement, when compressed, the spring-loaded element 560 will push the edge of a portion of the material sheet 2 inwards toward the inner side of the portion of the material sheet 122, as... Figure 8B As shown, this causes part of the material sheet 2 to bulge inward. Therefore, the spring-loaded element 560 is used instead of... Figure 5A and Figure 5B In the case of spring-loaded component 260, a similar effect will be achieved.

[0050] It should be noted that, according to the above embodiment, the friction plate 170 is attached to the pressing surface of the spring-loaded member. However, in other embodiments, the clamping device effect can still be achieved without the friction plate 170. It should also be noted that the number of spring-loaded members is not limited.

[0051] The main material sheet and the partial material sheets may be made of the same or different materials, and may be any material selected from the group consisting of fabrics and leather.

[0052] In the clamping device of the present invention, by arranging the spring member so that the deformation direction is from the inside of the partial material receiving hole to the outside of the partial material receiving hole, the partial material sheet can be stretched, thereby limiting the shrinkage of the sewing thread on the partial material sheet during sewing.

[0053] Furthermore, by arranging spring-loaded members with different deformation directions at different positions in the clamping device of the present invention, some material sheets can be stretched or bulged as needed.

[0054] According to the above embodiments, the spring-loaded member is configured to have a deformation direction in the horizontal direction, i.e., perpendicular to the reference direction y. However, spring-loaded members with different structures do not have a deformation direction in the horizontal direction; that is, in the compressed position, they only press down on a portion of the material sheet 2 without stretching or bulging the portion of the material sheet, which still falls within the scope of the present invention.

[0055] The specific embodiments described above are not intended to limit the scope of this invention. All equivalent modifications and alternatives implemented by those skilled in the art also fall within the scope of this invention.

Claims

1. A clamping device, comprising: A support plate (110) includes at least one lower sewing hole (112) and a body material support surface (114), the body material support surface defining a reference direction perpendicular to the body material support surface and pointing from the inside of the support plate toward the outside of the support plate. A main material pressure plate (120) is arranged above the support plate (110) in the reference direction, wherein the main material pressure plate (120) includes at least one partial material receiving hole (122) for receiving a partial material sheet, and wherein the at least one partial material receiving hole overlaps with the at least one lower sewing hole (112) in the reference direction. An upper pressure plate (130) is arranged above the main material pressure plate (120) in the reference direction, wherein the upper pressure plate (130) includes at least one upper sewing hole (132), and wherein the at least one upper sewing hole (132) overlaps entirely with the at least one partial material receiving hole (122) in the reference direction; and At least one spring-loaded element (160, 260) is arranged between the upper pressure plate (130) and the main material pressure plate (120), wherein the at least one spring-loaded element (160, 260) is fixed to the upper pressure plate (130) and includes a pressing surface (165) overlapping the at least one partial material receiving hole (122). The at least one spring-loaded member (160, 260) deforms in a direction that stretches the portion of the material sheet in response to pressure along the reference direction between the upper pressure plate (130) and the main material pressure plate. The at least one spring-loaded member (160, 260) includes an upper plate (162), a lower plate (164), and an elastic plate (166) attached to the upper plate and the lower plate. The elastic plate (166) is arranged at an angle relative to the lower plate (164) such that it forms an acute angle (α) with the lower plate (164). The upper plate (162) of the at least one spring-loaded member (160, 260) is fixed to the upper pressure plate (130), and The lower plate (164) includes the pressing surface (165).

2. The clamping device according to claim 1, wherein, The at least one spring-loaded member (160, 260) deforms in a direction perpendicular to the reference direction in response to pressure between the upper pressure plate (130) and the body material pressure plate (120) along the reference direction.

3. The clamping device according to claim 1, wherein, The at least one spring-loaded member (160, 260) includes a friction plate (170) attached to the pressing surface (165) of the at least one spring-loaded member. The friction plate (170) is made of a material with a high coefficient of friction.

4. The clamping device according to claim 3, wherein, The friction plate (170) is made of a material selected from the group consisting of sandpaper and anti-slip rubber.

5. The clamping device according to any one of claims 1 to 4, wherein, The at least one spring-loaded member (160) deforms in response to pressure along the reference direction between the upper pressure plate (130) and the body material pressure plate (120), from the point on the inside of the at least one partial material receiving hole (122) that overlaps with the pressing surface (165) in the reference direction to the outside of the at least one partial material receiving hole (122).

6. The clamping device according to any one of claims 1 to 4, wherein, The at least one spring-loaded member (260) deforms in response to pressure along the reference direction between the upper pressure plate (130) and the body material pressure plate (120), from the outer side of the at least one partial material receiving hole (122) at a point overlapping the pressing surface (165) in the reference direction toward the inner side of the at least one partial material receiving hole (122).

7. The clamping device according to any one of claims 1 to 4, wherein, The clamping device includes at least one first spring-loaded element (160) and at least one second spring-loaded element (260). Wherein, the at least one first spring-loaded member (160) deforms in response to pressure along the reference direction between the upper pressure plate (130) and the main material pressure plate (120), from a point on the inside of the at least one partial material receiving hole (122) overlapping the pressing surface (165) in the reference direction towards the outside of the at least one partial material receiving hole (122), and The at least one second spring-loaded member (260) deforms in response to pressure between the upper pressure plate (130) and the main material pressure plate (120) along the reference direction in a direction from the outer side of the at least one partial material receiving hole (122) overlapping the pressing surface (165) in the reference direction to the inner side of the at least one partial material receiving hole (122).

8. The clamping device according to any one of claims 1 to 4, further comprising: The main material sheet (1) sandwiched between the support plate (110) and the main material pressure plate (120) and the partial material sheet (2) arranged in the at least one partial material receiving hole (122). The at least one spring-loaded member (160, 260) responds to pressure along the reference direction between the upper pressure plate (130) and the main material pressure plate (120) to press the edge of the partial material sheet (2) with the pressing surface (165).

9. The clamping device according to claim 8, wherein, The materials of the main material sheet and the partial material sheet are any materials selected from the group consisting of fabrics and leather.

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