TWI748010B - Sewing machine - Google Patents

Abstract

To allow a support section, provided for supporting a sewing workpiece at the time of sewing, to be adjusted to a desired height The sewing machine of the present invention includes: a support member 19 in the form of a support arm movable in an up-down direction through an opening 24 formed in a needle plate 4, the support arm 19 having: a fabric support surface 22 for supporting the sewing workpiece; and a needle hole 23 provided in the fabric support surface 22 so as to permit passage therethrough of a needle 50 moving in the up-down direction; and an elevator mechanism 40 that moves the support arm 19 in the up-down direction while holding the fabric support surface 22 of the support arm 19 in a horizontal posture. The support arm 19 extends in a lateral direction of the sewing machine and mounted at its one end to the elevator mechanism 40 in a cantilevered fashion, and the support arm 19 has the fabric support surface 22 and the needle bar 23 at the other end. The elevator mechanism 40 includes a slide rail 10 extending straight, the support arm 19 being supported in a substantially perpendicular direction relative to the slide rail 10 and movable in the up-down direction along the slide rail 10.

Description

Sewing machine

The present invention relates to a sewing machine, and more specifically relates to a mechanism for supporting a sewing object in the sewing machine.

Previously, in pattern sewing machines used in the manufacture of clothing, bags, shoes, etc., a pattern template was used when stitching the sewn sheet K (component) and the base fabric H as the main body of the product. Figures 6 and 7 are diagrams illustrating the pattern template 30 used for shoe sewing as an example. The model plate 30 includes a lower plate 27 and an upper plate 29 that is hinged to the lower plate 27. The lower plate 27 is formed with pattern holes 26 corresponding to the pattern of stitches S for sewing the sewn sheet K and the base fabric H together. The upper plate 29 has a through hole 28 approximately the same as the shape of the sewn sheet K, and the sewn sheet K is positioned relative to the base fabric H by the through hole 28. Specifically, the base cloth H is placed on the lower plate 27 by fitting the guide pins 31 provided on the upper surface of the lower plate 27, the upper plate 29 sandwiches the placed base cloth H, and the sewn sheet K is embedded in the upper plate. The through hole 28 of the plate 29 is provided with a base cloth H and a sewn sheet K on the pattern template 30. The holding frame of the holding pattern template 30 is moved based on the pattern data corresponding to the pattern of the stitch S, and the sewing piece K is stitched with the base fabric H by the stitching S of the sewing piece K by the well-known sewing machine mechanism . However, the stitching of the pattern template 30 has the following problems. Since the base cloth H placed on the upper surface of the lower plate 27 is in a state where the thickness of the lower plate 27 is raised from the needle plate, there is no support for the sewn sheet K and the base cloth H from below. Therefore, the base fabric H sinks due to the penetration resistance when the sewing needle penetrates the sewn sheet K, and the posture of the sewn sheet K is shifted. As a result, problems such as the needle not falling at the correct position on the sewn sheet K, or sewing wrinkles due to the sewn sheet K are likely to occur. In particular, in the manufacture of shoes, stitching is applied tightly along the edge of the sewn sheet K to be sewn, which causes stitch deviation or skipping due to the stitches slipping from the sewn sheet K. The reason. As a solution to the above-mentioned problem, Patent Document 1 discloses that a ring-shaped sleeve that can be displaced to a position protruding from the needle plate supports the sewing object from below, thereby preventing or suppressing the displacement of the sewing object. In addition, Patent Document 2 discloses that by providing a cloth receiving device that can swing up and down under the sewing surface, the sewing object is clamped by both the cloth pressing device and the cloth receiving device, and the sewing object will not be sewn. Displacement to the bottom. However, Patent Document 1 has a structure in which a slider having an inclined surface at the front end is moved in the lateral direction, the inclined surface is submerged in the lower part of the ring sleeve, and the ring sleeve is lifted, so it is not easy to lift the ring. Various changes are made to the height of the shaped sleeve. In addition, in the structure of Patent Document 1, when the annular sleeve is lifted, a lateral force is applied to the lower part of the annular sleeve. Since there is looseness between the annular sleeve and the insertion hole, the annular sleeve does not rise vertically but rises in an oblique posture due to the aforementioned lateral force. It is the cause of needle breakage caused by the contact between the annular sleeve and the needle. Furthermore, in the structure of Patent Document 1, since the annular sleeve is only supported by the front end of the slider in the lifted state, it is easy to produce when the sewing object is pressed downward due to the penetration resistance of the needle. The problem of the annular sleeve pressing the sliding member and causing it to flex. In addition, the cloth receiving device of Patent Document 2 prepares the cloth receiving table approximately in the center of an arm-shaped cloth receiving table extending in the lateral direction, and uses one end of the cloth receiving table as a swing fulcrum to swing the other end of the cloth receiving table up and down. Composition, and the mechanism is complicated. In addition, the cloth receiving device of Patent Document 2 is not suitable for a multi-head sewing machine in which a plurality of heads are arranged side by side due to a larger size in the lateral direction. In addition, in the cloth receiving device of Patent Document 2, since the cloth receiving table is located on the front of the shuttle, the cloth receiving table becomes an obstacle, and it is impossible to install a well-known bobbin changing mechanism that releases the bobbin from the shuttle. . More specifically, the cloth receiving device of Patent Document 2 retreats downward from the raised position by using one end of the arm-shaped cloth receiving table extending in the lateral direction as the swing fulcrum to swing the other end of the cloth receiving table up and down. The structure of position switching, and the cloth receiving table does not move in parallel when it is raised and lowered. In the structure of Patent Document 2, the cloth receiving table is substantially horizontal only at a specific height position, and the cloth receiving table is inclined obliquely (refer to FIGS. 3 and 4 of Patent Document 2). Therefore, even if it is assumed that the height of the cloth receiving table is changed in accordance with the thickness of the pattern plate in Patent Document 2, the position of the cloth receiving table is still offset from the needle according to the height of the cloth receiving table. Therefore, neither Patent Document 1 nor Patent Document 2 can arbitrarily change the height of the annular sleeve or the cloth receiver. In addition, in the case of sewing using a pattern pattern, only the pattern pattern with a fixed thickness is used. Generally speaking, the thickness of the model board (upper board, lower board) ranges from 1 mm to 4 mm. However, in the above-mentioned prior art structure, it cannot correspond to various thickness models. [Prior Art Document] [Patent Document] [Patent Document 1] Japanese Patent No. 3556671 [Patent Document 2] Japanese Patent Laid-Open No. 4-300581

[Problems to be Solved by the Invention] The present invention was made in view of the above-mentioned points, and its object is to provide a sewing machine capable of changing the height of a support member supporting a sewing object to a desired height. [Technical Means to Solve the Problem] The sewing machine of the present invention is provided with a supporting member that can move up and down through an opening provided in the needle plate, and includes a needle for supporting the upper end surface of the sewing object and allowing up and down movement The pinhole is provided on the upper end surface in a passing way; and a lifting mechanism that maintains the level of the upper end surface of the support member and moves the support member up and down. According to the above configuration, since the lifting mechanism maintains the level of the upper end surface of the support member and moves the support member up and down, even if the support member is moved to any height, the needle drop position and the needle hole will not deviate by this movement. , And the upper end surface of the supporting member supports the sewing object in an appropriate posture, thereby preventing or restraining the displacement of the sewing object. Therefore, for example, in sewing using a pattern template, it can correspond to pattern templates of various thicknesses. Therefore, the sewing machine according to the present invention has an excellent effect of being able to change the height of the supporting member supporting the sewing object to a desired height.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Figure 1 shows a front view of the main part of the sewing machine of an embodiment with a partial cross-section. For convenience, the upper sewing head in the sewing machine is omitted, and the sewing table 2 installed in the lower part of the sewing machine is removed. And the organization related to shuttle seat 1. Fig. 2 shows a side view of the sewing machine of Fig. 1 viewed from arrow A, and Fig. 3 shows a plan view of the sewing machine of Fig. 1 viewed from arrow B. The sewing machine can be a single-head sewing machine with only one sewing head, or a multi-head sewing machine with a plurality of sewing heads. The sewing head (not shown) of the sewing machine is provided with a needle bar (not shown) equipped with a needle (symbol 50 in FIG. 5 described later) for sewing the object to be sewn (hereinafter also referred to as "the object to be sewn"). There is a shuttle seat 1 directly below the head. As shown in FIGS. 1 to 3, the shuttle seat 1 is fixed on the upper surface of the lower frame 3 under the sewing table 2. A needle plate 4 is fixed to the upper surface of the shuttle seat 1 so as to substantially coincide with the upper surface of the sewing table 2, and a vertical shuttle 5 is arranged below the needle plate 4. The vertical shuttle 5 includes an inner shuttle and an outer shuttle. The outer shuttle is rotatably supported on the shuttle seat 1 and rotates by the rotational force of a drive shaft 6 that is penetrated and supported on the shuttle seat 1. The inner shuttle is relatively rotatably embedded inside the outer shuttle to prevent the shuttle holder 7 installed on the shuttle seat 1 from rotating together with the outer shuttle. These structures are as well known. The sewing machine of the present invention is characterized by having: a supporting member 19 which can be moved up and down through the opening 24 provided in the needle plate 4, and includes a needle for supporting the upper end surface 22 of the sewing object and allowing the up and down movement The passage of 50 is provided in the pinhole 23 of the upper end surface 22; and the lifting mechanism 40, which maintains the level of the upper end surface 22 of the support member 19 and moves the support member 19 up and down. In the following description, the supporting member 19 is referred to as the "support arm 19", and the upper end surface 22 is referred to as the "cloth receiving surface 22". Fig. 4 is an exploded perspective view showing an example of the support arm and the lifting mechanism. A slot-shaped mounting base 8 is fixed on the right side of the shuttle seat 1. The attachment base 8 is fixed to the shuttle seat 1 with, for example, a screw at the rear end 8b so that the front end 8a protrudes toward the front of the sewing machine. A support stand 9 having an elongated shape extending in the vertical direction is fixed to the front end portion 8a of the mounting base 8. A guide member 12 composed of a slide rail 10 linearly extending in the vertical direction and a sliding body 11 that can slide along the slide rail 10 is fixed to the support base 9 with screws, for example. A lifting member 13 is attached to the sliding body 11. The lifting member 13 has a substantially L-shaped slender shape that extends in the vertical direction as a whole and whose upper end is bent to the left when viewed from the front of the sewing machine. The upper end of the lifting member 13 becomes the mounting surface 14 substantially parallel to the sewing table 2 (needle plate 4). On the other hand, the lower end of the lifting member 13 is connected to the free end of the driving rod 16 via the connecting rod 15. The driving rod 16 is fixed to the output shaft 18 of the motor 17, and the motor 17 is fixed to the front surface of the lower frame 3. The driving rod 16 is driven by the motor 17 to reciprocate within a specific angle range, and the lifting member 13 moves up and down along the slide rail 10. move. In this embodiment, the aforementioned mounting base 8, support base 9, guide member 12 (slide rail 10 and sliding body 11), lift member 13, link 15, drive rod 16, and motor 17 constitute a lift mechanism 40 . The mounting surface 14 at the upper end of the lifting member 13 is fixed with a support arm 19 including an arm member extending in the lateral direction with respect to the sewing machine. The connecting portion 19a of the supporting arm 19 at one end (the right end as viewed from the front of the sewing machine) is fixed to the upper surface of the mounting surface 14 with a screw 20. Specifically, as shown in FIG. 1 etc., the support arm 19 is attached to the lifting mechanism 40 (the upper end of the lifting member 13) in a cantilever shape at one end thereof. In other words, the lifting mechanism 40 supports the support arm 19 in a substantially vertical direction with respect to the slide rail 10. The support arm 19 has an arm portion 19b, which extends from the connecting portion 19a obliquely upward to the left when viewed from the front of the sewing machine. ) Equipped with a supporting member 21. The support member 21 includes a cylindrical portion protruding upward, and is provided with a cloth receiving surface 22 on the upper surface. The cloth receiving surface 22 is a part for supporting the object to be sewn, and is formed so as to be a surface substantially parallel to the sewing table 2 (needle plate 4). A needle hole 23 is provided in the center of the supporting member 21 to allow passage of a needle (symbol 50 in FIG. 5) that moves up and down. The support arm 19 is installed on the lifting mechanism 40 in such a way that the needle hole 23 is located at the needle drop position. Therefore, the needle (reference symbol 50 in FIG. 5) penetrates the needle hole 23 when penetrating the object to be sewn supported by the cloth surface 22.

As shown in FIGS. 3 and 4, the needle plate 4 is provided with an opening 24 corresponding to the needle drop position and the support arm 19. The through hole 24 a of the opening 24 through which the needle and the support member 21 are inserted, and the through hole 24 b cut out along the shape of the support arm 19 are integrally formed. Therefore, the support arm 19 can move up and down through the opening 24 provided in the needle plate 4. In addition, an escape hole 25 is provided in the corresponding position of the needle plate 4 to the screw 20 so that the screw 20 will not abut the needle plate 4 when the support arm 19 is raised.

Since the support arm 19 including the above-mentioned structure is fixed to the upper end of the lifting member 13, the lifting member 13 moves up and down in a straight line along the slide rail 10 in a vertical direction corresponding to the up and down movement of the lifting member 13 caused by the driving of the motor 17. Therefore, the lifting mechanism 40 can maintain the level of the cloth receiving surface 22 of the support arm 19 and move the support arm 19 up and down.

The sewing machine is driven up and down corresponding to the needle bar (not shown) to make the upper thread of the needle (symbol 50 in Figure 5) installed on the needle bar and the bottom thread of the vertical shuttle 5 corresponding to the needle bar as well-known Tangle and sew the object to be sewn. In the manufacture of clothes, bags, shoes, etc., there are cases where the parts (sewn sheet K) and the product body (base cloth H) are overlapped and sewn together. In this case, the template 30 shown in FIGS. 6 and 7 described above is used. The model plate 30 includes a lower plate 27 and an upper plate 29 as shown in FIGS. 6 and 7. By placing the base fabric H on the upper surface of the lower plate 27 and sandwiching the base fabric H by the upper plate 29, Then, the sewn sheet K is inserted into the upper plate 29, and the base cloth H and the sewn sheet K are provided. The pattern template 30 is held by the retaining frame and is arranged on the sewing machine's sewing work surface, that is, the position below the sewing head on the upper surface of the sewing table 2 (needle plate 4). The sewing machine moves the holding frame of the holding pattern template 30 based on the pattern data representing the pattern of the stitch S and performs a sewing operation, and uses the stitch S to sew the sewn sheet K and the base fabric H.

When sewing the pattern template 30 as described above, the base cloth H placed on the upper surface of the lower plate 27 will float from the needle plate 4 only by the thickness of the lower plate 27. Therefore, when sewing using the pattern template 30 (when the needle penetrates the object to be sewn), the fabric receiving surface 22 of the support arm 19 is used to support the base fabric H from below. Fig. 5(a) shows the state where the support arm 19 is lowered to the retracted position, and Fig. 5(b) shows the state where the support arm 19 is raised to the uppermost position. In Figs. 5(a) and 5(b), the symbol 27 represents the lower plate of the model template 30, the symbol H represents the base fabric, the symbol 29 represents the upper plate, and the symbol K represents the stitched sheet. In the retracted position shown in FIG. 5(a), the support arm 19 is located below the needle plate 4. At this time, in order to prevent interference with the lower plate 27 of the pattern template 30, the supporting arm 19 is lowered to a position where the upper surface of the needle plate 4 and the cloth receiving surface 22 of the supporting member 21 become the same plane. In the uppermost position of FIG. 5( b ), the support arm 19 is inserted through the through hole 24 b of the opening 24 of the needle plate 4, and the support member 21 is inserted through the through hole 24 a and protrudes above the needle plate 4. In this state, the fabric receiving surface 22 abuts on the back of the base fabric H and supports the base fabric H from below. The uppermost position (height) of the support arm 19 can be set to a desired height by the stroke control of the lifting mechanism 40. The setting of the height of the support arm 19 is performed by, for example, the operation panel (not shown) of the sewing machine. In one example, the height of the support arm 19 can be set within the range of 0 mm to 4 mm in accordance with the thickness of the general pattern template (upper board, lower board). The control system not shown in the figure controls the swing angle of the drive rod 16 of the motor 17 based on the setting value input from the operation panel (not shown). As the lifting member 13 of the sliding body 11 installed on the slide rail 10 rises corresponding to the swing angle of the drive rod 16, the support arm 19 rises to a height corresponding to the set value. Thereby, the cloth receiving surface 22 at the front end of the support arm 19 protrudes above the needle plate 4 at a height corresponding to an arbitrary set value. As an example, the up and down movement of the support arm 19 is performed synchronously with the raising and lowering of the needle 50. In this case, the support arm 19 is repeatedly raised and lowered for each stitch. Specifically, when the needle 50 is in the raised position, as shown in FIG. 5(a), the support arm 19 is lowered to the retracted position, and when the needle 50 is lowered and pierces the sewn sheet K, as shown in FIG. 5(b), The support arm 19 rises to the uppermost position. When the needle 50 descends to the lowered position, the front end of the needle 50 penetrates the object to be sewn (the base cloth H and the sewn sheet K) and penetrates the needle hole 23 of the support arm 19. At this time, since the back surface of the base fabric H is supported from below by the fabric receiving surface 22, even if the base fabric H is floating from the needle plate 4, the base fabric H due to the penetration resistance of the needle 50 can be prevented. The displacement of the sewn article (base fabric H and the sewn sheet K) such as sinking and the posture deviation (inclination) of the sewn sheet K accompanying it, therefore, prevents or suppresses the deviation of the needle drop position, The occurrence of sewing wrinkles, or the needle 50 slips off the sewing sheet K, etc. This can prevent stitch deviation or stitching defects such as jumpers. As another example, the raising and lowering of the supporting arm 19 and the raising and lowering of the needle 50 can be made asynchronous, and the supporting arm 19 can be kept raised to the uppermost position in FIG. 5(b) and the sewing operation can be performed. For example, in the case where the needle step S is taken along the edge of the sewn sheet K, it is preferable to keep the support arm 19 raised to the uppermost position and perform the sewing operation. In this case, the sewing machine keeps the support arm 19 raised to the uppermost position in Fig. 5(b) during the sewing operation, while moving the pattern template 30 based on the pattern data, while on the sewing object (base cloth H and sewing With film K) Take stitch S. In addition, when the pattern template 30 interferes with the support member 21 during the sewing operation, it is only necessary to lower the support arm 19 to the retracted position at that time. According to the embodiment described above, the support arm 19 is moved up and down while maintaining the level of the cloth receiving surface 22 of the support arm 19 by the lifting mechanism 40. Therefore, even if the support arm 19 is moved to any height, the support arm 19 is moved up and down. Down, the needle drop position and the needle hole 23 will not deviate, and the support arm 19 supports the sewing object in an appropriate posture, so that the displacement of the sewing object can be prevented or suppressed. Therefore, for example, in sewing using the pattern template 30, the height of the support arm 19 can be changed to a desired height corresponding to the pattern template of various thicknesses. Therefore, the present invention is suitable for sewing the pattern template 30. In addition, the lifting mechanism 40 can be arranged on the side of the shuttle seat 1 (the right side in FIG. 1) by using a configuration in which the support arm 19 is cantilevered to the lifting mechanism 40. Therefore, the support arm 19 and the lifting mechanism 40 will not be an obstacle to the front of the vertical shuttle 5. Therefore, even if the sewing machine of this embodiment is configured to include the support arm 19 and the elevating mechanism 40, a well-known bobbin replacement mechanism for releasing the bobbin from the vertical shuttle 5 can be installed. In addition, the structure in which the support arm 19 is moved up and down in the vertical direction by the slide rail 10 of the lifting mechanism 40 does not increase in size in the lateral direction. Therefore, the structure of the support arm 19 and the lifting mechanism 40 shown in the embodiment is also suitable for a multi-head sewing machine in which a plurality of sewing heads are arranged side by side. The present invention is not limited to the foregoing embodiments, and various changes can be made within the scope of the patent application and the technical ideas described in the specification and drawings. For example, the support arm 19 can move up and down as long as it passes through the opening 24 provided in the needle plate 4, and includes a cloth receiving surface 22 for supporting the sewing object, and is provided on the receiving surface in a manner that allows the needle 50 to move up and down. The pinhole 23 of the cloth surface 22 can be any shape and structure. Furthermore, the lifting mechanism 40 is not limited to the mechanism including the slide rail 10, as long as it is a rack/pinion mechanism, belt, or chain that can maintain the level of the cloth receiving surface 22 of the support arm 19 and move the support arm 19 up and down. The organization can be any organization. Furthermore, for example, the guiding member 12 (slide 10 and sliding body 11) may include an electric linear motor. In this case, the structure of the lifting mechanism 40 can be further simplified. In addition, the direction in which the support arm 19 moves up and down by the elevating mechanism 40 only needs to maintain the level of the cloth receiving surface 22, and is not limited to the vertical direction. For example, the slide rail 10 can be arranged obliquely with respect to the vertical direction, and the support arm 19 can be moved up and down along the slide rail 10. In addition, the sewing by the sewing machine is not limited to the sewing using the pattern template 30. The sewing machine of the present invention is not limited to ordinary sewing machines, and embroidery sewing machines and other special sewing machines are also included in its scope.

1‧‧‧Shuttle seat 2‧‧‧Sewing table 3‧‧‧Lower frame 4‧‧‧Needle plate 5‧‧‧Vertical shuttle 6‧‧‧Drive shaft 7‧‧‧Shuttle bracket 8‧‧‧Installation base 8a ‧‧‧Front end 8b‧‧‧Back end 9‧‧‧Supporting table 10‧‧‧Slide rail 11‧‧‧Sliding body 12‧‧‧Guiding member 13‧‧‧Lifting member 14‧‧‧Mounting surface 15 Connecting rod 16 ‧‧‧Screw 21‧‧‧Supporting member 22‧‧‧Receiving surface/upper end surface 23‧‧‧Pinhole 24‧‧‧Opening 24a‧‧‧Through hole 24b‧‧‧Through hole 25‧‧‧Evasion hole 26 ‧‧‧Pattern hole 27‧‧‧Lower plate 28‧‧‧Through hole 29‧‧‧Upper plate 30‧‧‧Model plate 31‧‧‧Guide pin 40‧‧‧Elevating mechanism 50‧‧‧Needle H‧‧‧ Base cloth K‧‧‧ stitched piece S‧‧‧ stitch

Fig. 1 is a front view of a sewing machine according to an embodiment of the present invention, and is a diagram showing the mechanism provided below by extracting it. Figure 2 is a side view of the sewing machine of Figure 1 viewed from arrow A. Figure 3 is a plan view of the sewing machine of Figure 1 viewed from arrow B. Fig. 4 is an exploded perspective view showing the supporting member and the lifting mechanism taken out. Fig. 5(A) is a diagram illustrating the retreat position of the support member; Fig. 5(B) is a diagram illustrating the uppermost position of the support member. Fig. 6 is a diagram illustrating the prior art, and is an exploded perspective view of a pattern template used for stitching. FIG. 7 is a diagram illustrating the prior art, and is a diagram of the model plate of FIG. 6 viewed from above.

1‧‧‧Shuttle seat

2‧‧‧Sewing table

3‧‧‧ Lower frame

4‧‧‧Needle plate

5‧‧‧Vertical Shuttle

6‧‧‧Drive shaft

7‧‧‧Shuttle bracket

8‧‧‧Mounting base

9‧‧‧Support Desk

10‧‧‧Slide rail

11‧‧‧Sliding body

12‧‧‧Guiding member

13‧‧‧Lifting components

15‧‧‧Connecting rod

16‧‧‧Drive lever

17‧‧‧Motor

19‧‧‧Supporting member/supporting arm

20‧‧‧Screw

40‧‧‧Lifting mechanism

Claims (5)

A sewing machine is provided with: a support member that can be moved up and down through an opening provided in a needle plate, and includes a support member for supporting the upper end surface of an object to be sewn, and is provided in a manner that allows the needle to move up and down to pass through The pinhole on the upper end surface; and a lifting mechanism that maintains the level of the upper end surface of the support member and moves the support member up and down. The sewing machine of claim 1, wherein the support member includes an arm member extending in the lateral direction with respect to the sewing machine, and one end of the arm member is mounted on the lifting mechanism in a cantilever shape, and the other end of the arm member has the upper end surface And the aforementioned pinhole. The sewing machine of claim 1, wherein the lifting mechanism includes a linearly extending slide rail, supports the support member in a substantially vertical direction relative to the slide rail, and moves the support member up and down along the slide rail. The sewing machine of claim 2, wherein the lifting mechanism includes a linearly extending slide rail, supports the support member in a substantially vertical direction relative to the slide rail, and moves the support member up and down along the slide rail. The sewing machine according to any one of claims 1 to 4, wherein the uppermost position of the aforementioned supporting member can be variably set.

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