Position determination arrangement equipped with a decentrally driven tongue rod seat

Abstract

Positioning arrangement of a sewing machine with a decentrally driven tongue rod seat, wherein the tongue rod seat (20) is mounted on the tool block (10) of the sewing machine and is provided with a tongue rod (30), wherein the tongue rod (30) comprises a guide part (32), and wherein the tongue rod seat (20) is designed with a guide groove (23) for sliding the guide part (32), wherein the positioning arrangement of the tongue rod seat (20) comprises the following components: • a decentrally positioning part (40), which is arranged between the tongue rod seat (20) and the tool block (10) and is designed with a rotating end (41) on the side of the tool block (10) and a drive end (42) on the side of the tongue rod seat (20), wherein the decentrally positioning part (40) is rotatably mounted on the tool block (10) about the rotating end (41) as an axis, wherein the drive end (42) protrudes into a corresponding insertion opening (22) on the tongue rod seat (20),to move the tongue rod seat (20), wherein the drive end (42) is decentralized to the rotating end (41), and a joint guide hole (110) arranged between the tongue rod seat (20) and the tool block (10), as well as a complementary joint pin (21) with which the tongue rod seat (20) can rotate on the tool block (10), wherein the decentralized positioning part (40) rotates about the rotating end (41) as an axis, and the decentralized drive end (42) moves the tongue rod seat (20) with the joint pin (21) as a pivot point to a desired setting position.

Description

[0001] The invention relates to an adjusting device on the tongue rod seat of a sewing machine, in particular a position determination arrangement provided with a decentrally driven tongue rod seat.

[0002] In the prior art, a tongue rod is mounted on the tongue rod seat on the tool stand of a sewing machine, and is slidably arranged on the tongue rod seat, as disclosed in the Taiwanese publication of patent application I363822. In this arrangement, an adjustable setting device is further provided between the tongue rod seat and the tongue rod for a linear sliding element. In this device, when an adjusting rod located below the tongue rod is rotated, the tongue rod (linear sliding element) adjusts the rotation of an eccentric. A connecting rod is driven for movement approximately along a Y-axis, since one end of the connecting rod is coupled to the off-center section of the eccentric. At the other end of the connecting rod, a pivoting groove eccentric of the tongue rod is pivotally attached to an elongated hole and can be driven for rotation about the X-axis by a shaft coupled to a recessed section located above it.As the swivel groove eccentric of the tongue rod (linear sliding part) rotates, a raised part coupled to the circumferential surface or the inside of the swivel groove eccentric of the tongue rod moves along the X-axis (in a transverse direction). The component, pinned around the tongue rod seat (swivel part), is pivotally attached at one end, while the corresponding other end can pivot along the X-axis. For the interaction process, the elements would require an arrangement in which a connecting rod is driven by two parallel cams and a cooperating eccentric. This design is too complex and requires multi-axis actuation, demanding extreme precision.If the entire assembly is to be used for a certain period of time, the mutual adjustment accuracy of the components will be impaired due to the wear of certain components, so that the tongue rod seat cannot bring the tongue rod to an optimal starting position, even though the tongue rod and the tongue rod seat are in the correct place.

[0003] Furthermore, according to JP 2005-401 and JP 2003-167272 cited in the aforementioned Taiwanese patent disclosure, the position of the tongue rod seat is adjusted by a rotating adjusting rod driving an eccentric or a driver, causing the driver to move laterally. The pivot points of the driver also move, thus shifting one end of the tongue rod accordingly, but the tongue rod seat does not move in the same way. Therefore, the movement of the tongue rod remains incomplete and unstable. Furthermore, the mutual engagement between the tongue rod seat and the tool block is also lacking. In this respect, the two embodiments are to be improved.

[0004] The invention is based on the objective of providing a position determination arrangement with a decentrally driven tongue rod seat, which is characterized by plausible setting results based on a simple design, low costs and highly efficient properties.

[0005] To solve the problem, the position determination arrangement according to the invention has the following components: a decentralized positioning part installed between the tongue rod seat and the tool block, which is designed with a rotating end on the side of the tool block and a drive end on the side of the tongue rod seat, wherein the decentralized positioning part rotates about the rotating end as an axis and the drive end projects into a socket opening of the tongue rod seat in order to drive the tongue rod seat, wherein the drive end is decentralized to the rotating end, and a joint guide hole arranged between the tongue rod seat and the tool block, and a complementary joint pin with which the tongue rod seat can rotate on the tool block, wherein the decentered positioning part rotates around the rotating end as an axis and the decentered drive end takes the tongue rod seat with it so that the decentered positioning part pivots with the joint pin as a pivot point to a desired setting position.

[0006] To solve the problem, a further embodiment is provided, wherein the decentralized positioning part arranged between the tongue rod seat and the tool block is designed with a rotating end on the side of the tool block and a drive notch on the side of the end face of the tongue rod seat, wherein the decentralized positioning part rotates about the rotating end as an axis, while the drive notch receives and drives the plug-in shaft projecting from the tongue rod seat, wherein the plug-in shaft is located decentrally to the drive end.

[0007] In this arrangement, a joint guide hole and a complementary joint pin are arranged between the tongue rod seat and the tool block, with which the tongue rod seat can rotate on the tool block, whereby the decentralized positioning part rotates around the rotating end as an axis and the drive notch takes the plug axis with it so that the tongue rod seat pivots to a desired setting position with the joint pin as a pivot point.

[0008] The upper surface of the tool block is formed with a first end face and a second end face, the first being higher than the second. The first end face has a pivot guide hole for receiving the pivot pin protruding from the base of the tongue rod seat. A knife blade is arranged on one side of the first end face.

[0009] A pressing element is attached to the tool stand, which features a top stop along the tongue rod seat. This top stop serves to limit the tongue rod's movement within the tongue rod seat. The pressing element is further equipped with a spring-loaded end for buffering the moving decentralized positioning element and a vertically arranged positioning element. The positioning element has a through-hole for receiving a fixing pin for attachment to the tool stand. The two ends of the positioning element's top stop are each designed as a pressing end to elastically press the tongue rod into the tongue rod seat.

[0010] The decentralized positioning element is further equipped between the drive end and the rotating end with a damping element arranged around the rotating end as an axis center, which interacts with the spring-loaded end for elastic buffering. An actuating element extends from one side of the damping element.

[0011] The tongue rod comprises a tongue end, a guide element extending from the tongue end, and an actuating element arranged perpendicular to the guide element. The tongue rod seat is designed with a guide groove for the sliding of the guide element. A clearance groove for receiving the extending actuating element is arranged on the side of the guide groove. To limit the rotation angle of the decentralized positioning element, a flank of the tongue rod seat interacts with the actuating element of the decentralized positioning element. Two convex stop pieces are arranged on the side of the tongue rod seat, limiting the rotation angle of the decentralized positioning element driven by the actuating element.

[0012] A fine-adjustment seat is arranged on the second end face of the tool block. This seat features an off-center hole for receiving the inserted rotating end of the off-center positioning element. An actuating element is located on the upper surface of the fine-adjustment seat, allowing the seat's angular position to be directly adjusted by a tool. This actuating element is positioned on the side of the disc-shaped circumference of the stop surface that projects from the upper surface of the fine-adjustment seat, enabling the seat to fine-tune the position of the off-center positioning element's center of rotation.

[0013] As described above, the decentralized positioning element in the inventive positioning arrangement is arranged in an overlapping position between the tool block and the tongue rod seat. The decentralized positioning element is manually rotated by a user. In this decentralized position, the decentralized positioning element drives the tongue rod seat. The tongue rod seat is mounted on the tool block via a pivot point and can rotate around this pivot point, allowing the offset angle of the tongue rod seat to be quickly and reliably adjusted. This enables the tongue rod to be moved from the correct angular position on the tongue rod seat, resulting in advantages such as simplified design, low cost, and high accuracy compared to direct decentralized drive. Fig. 1 Combination drawing of the first embodiment according to the invention Fig. 2 3D exploded view of the embodiment according to the invention Fig. 3 Top view of the first embodiment according to the invention, wherein the tongue rod is located at the end of the travel path of the tongue rod seat. Fig. 4 Top view of the first embodiment according to the invention, wherein the tongue rod is located at the beginning of the travel path of the tongue rod seat. Fig. 5 Top view of the first embodiment according to the invention, wherein the actuating part of the decentralized positioning part is in the first setting position. Fig. 6 Top view of the first embodiment according to the invention, wherein the actuating part of the decentralized positioning part is in the second setting position. Fig. 7 3D exploded view of the second embodiment according to the invention

[0014] In the Fig. 1 to Fig. Figure 3 shows the positioning arrangement according to the invention. A tongue rod seat 20 is mounted on the tool stand 10 of a sewing machine. A tongue rod 30 is inserted in the tongue rod seat 20, which has a tongue end 31, a guide part 32 extending from the tongue end 31, and an actuating part 33 arranged perpendicular to the guide part 32. The tongue rod seat 20 is designed with a guide groove 23 for sliding the guide part 32. A clearance groove 24 for receiving the extending actuating part 33 is arranged on the side of the guide groove 23. The positioning arrangement of the tongue rod seat 20 has the following components: A decentralized positioning part 40, which is arranged between the tongue rod seat 20 and the tool block 10, wherein the decentralized positioning part 40 is formed with a cylindrical rotating end 41 on the side of the tool block 10 and a cylindrical drive end 42 on the side of the tongue rod seat 20, wherein the decentralized positioning part 40 rotates about the rotating end 41 as an axis and the drive end 41 projects into a plug-in opening 22 of the tongue rod seat 20 in order to drive the tongue rod seat, wherein the width of the plug-in opening 22 corresponds to the diameter of the drive end 42 and the drive end 42 is located decentralized to the rotating end 41, wherein when the decentralized positioning part 40 is rotated, the drive end 42 is located at the side of the tool block 10 and the drive end 42 is located at the side of the tool block 10 and the tool block 10 ..., wherein the decentralized positioning part 40 rotates about the rotating end 41 as an axis and the drive end 41 projects into a plug-in opening 22 of the tongue rod seat 20 in order to drive the tongue rod seat along with it.Decentralized displacement of the drive end 42, the tongue rod seat 20 is plausibly displaced by the interaction of the drive end 42 with the plug opening 22, the decentralized positioning part 40 is further provided between the drive end 42 and the rotating end 41 with a disk-shaped damping part 43 arranged around the rotating end 41 as an axis center, which interacts with another component for elastic buffering during positioning of the decentralized positioning part 40, wherein an actuating part 44 extends from one side of the damping part 43, and . a joint guide hole 110 arranged between the tongue rod seat 20 and the tool block 10, and a complementary joint pin 21 with which the tongue rod seat 20 can rotate on the tool block 10, wherein the decentralized positioning part 40 rotates about the rotating end 21 as an axis and the decentralized drive end 42 takes the tongue rod seat 20 with the joint pin 21 as a pivot point to a desired setting position, wherein to limit the rotation angle of the decentralized positioning part 40 two convex stop pieces 25 arranged on the side of the tongue rod seat 20 cooperate with the actuating part 44 of the decentralized positioning part 40.

[0015] As can be seen from the figures, the upper surface of the tool block 10 is formed with a first end surface 11 and a second end surface 12, the first end surface 11 being higher than the second end surface 12. The first end surface 11 is provided with a pivot guide hole 110 for receiving the pivot pin 21 projecting from the base of the tongue rod seat 20. A knife blade 70 is arranged on one side of the first end surface 11 of the tool block 10. A pressing element 50 is arranged on another side of the tool block 10. The second end surface 12 is formed with a seat hole 120. Perpendicular to the seat hole 120, a fastening hole 121 extending through the side wall is arranged, which serves to receive a locking pin 122 for screwing into the seat hole 120 and clamping the components within the seat hole 120.

[0016] The pressing element 50 is attached to the tool stand 10. As can be seen from the figures, the pressing element 50 is arranged on a side facing away from the knife blade 70 and is attached to the tool stand 10 by two fixing pins 51 through the vertical ends of the pressing element 50. The pressing element 50 is designed as an inverted L-shaped elastic profile bent from a sheet of metal. A positioning element 52 is arranged at one vertical end of the pressing element 50, which has two through holes 520 for receiving the fixing pins 51 for fixing it to the tool stand 10. The pressing element 50 is provided with a top stop 53, which extends horizontally from the top of the positioning element 52 towards the tongue rod seat 20 and serves to restrict the tongue rod 30 within the tongue rod seat 20.At each of the two ends of the upper stop 53, a pressing end 531, bent towards the tongue rod 30, is arranged to elastically hold the tongue rod 30 within the tongue rod seat 20. The pressing part 50 is further provided with a spring-loaded pressing end 54, which extends horizontally from the positioning part 52 and interacts with the damping part 43 of the decentralized positioning part 40 to provide elastic cushioning. It should be noted that the present embodiment is further provided with a fine-adjustment seat 60, which is arranged in the seat hole 120 on the second end face 12 of the tool block 10. By tightening or loosening the locking pin 121, the fine-adjustment seat 60 is locked or unlocked in the seat hole 120 in order to adjust the angular position.The fine-tuning seat 60 is designed with an off-center hole 61 into which the rotating end 41 of the off-center positioning part 40 can be inserted and which can then rotate around it. A disc-shaped stop surface 62 is arranged on the upper side of the fine-tuning seat 60, i.e., above the seat hole 120. A concave actuating element 620 is arranged on the side of the stop surface 62 to move the fine-tuning seat 60 to a desired angular position and to change the position of the off-center hole 61. This allows the rotating end 41 of the off-center positioning part 40 to move into the correct position to trim the off-center positioning part 40.

[0017] In Fig. 3 and Fig. Figure 4 shows the actuation of the tongue rod 30 according to the invention. As can be seen from the figures, the actuating part 33 of the tongue rod 30 is moved from the end piece to the starting position of the deflection groove 24, so that the tongue end 31 of the tongue rod 30 extends. When reversing, the tongue end 31 retracts (see Figure 4). Fig. 3) Furthermore, as shown Fig. 4 and Fig. As can be seen in Figure 5, the actuating part 44 of the decentralized positioning part 40 is located in the middle between the two stop pieces 25 when the tongue end 31 of the tongue rod 30 extends to a faulty position (see Figure 5). Fig. 4) This position is defined as the basic position PO, the left side of the stop piece 25 as the left point PL, and the right side of the stop piece 25 as the right point PL. Accordingly, the position complementary to the tongue end 31 is considered the basic position PO1, the left point as PL1, and the right point as PR1. As from Fig. As can be seen in Figure 5, the actuating part 44 is located at the right point PR, so that the drive end 42 shifts off-center and, when pressed against the side wall of the plug opening 22, drives the tongue rod seat 20 to rotate around the pivot pin 21 as a pivot point, so that the tongue end 31 of the tongue rod 30 shifts to the right point PR1. As shown in Figure 5, the actuating part 44 is located at the right point PR1, so that the drive end 42 shifts off-center and, when pressed against the side wall of the plug opening 22, drives the tongue rod seat 20 to rotate around the pivot pin 21, thus shifting the tongue end 31 of the tongue rod 30 to the right point PR1. Fig. As can be seen in Figure 6, the actuating element 44 is located at the left point PL, so that the tongue end 31 of the tongue rod 30 is offset to the left point PL1. By simply actuating the actuating element 44, the direction of movement or the position of the tongue end 31 is quickly and easily controlled.

[0018] The above-mentioned arrangements have the following advantages: 1. Simple design: Only a single decentralized positioning element 40 is arranged between the tongue rod seat 20 and the tool block 10. This decentralized positioning element 40, using only a decentralized drive, can control and adjust the displacement position of the tongue rod seat 20 without the need for any other contributing elements. This offers advantages such as simple assembly and low costs with regard to components, composition, and maintenance. 2. Intuitive efficient drive: Due to the simple design, the direction of movement of the decentralized positioning part 40 remains opposite to the direction of movement of the tongue rod seat 20, so that users can perform the operations clearly, quickly, correctly and highly efficiently.

[0019] In Fig.Figure 7 shows a further embodiment. Here, the decentralized positioning part 40 is arranged between the tongue rod seat 20 and the tool block 10, as in the first embodiment. In contrast, the damping element 43 of the decentralized positioning part 40 is formed between them with a drive notch 420 facing the end face of the tongue rod seat 20. Accordingly, the tongue rod seat 20 is provided with a complementary plug-in shaft 220, which can project into the drive notch 420 and is thereby driven. The plug-in shaft 220 is arranged decentrally to the rotating end 41, so that the tongue rod seat 20 can be displaced by the drive of the decentrally arranged plug-in shaft 220 of the decentralized positioning part 40 and therefore also performs the aforementioned function.In the present embodiment, the joint guide hole 21' and the complementary joint pin 110' are arranged between the tongue rod seat 20 and the tool block 10 in the opposite direction to the first embodiment, namely the joint guide hole 21' is located at the bottom of the tongue rod seat 20, while the joint pin 110' is arranged on the tool block 10 and also serves as a pivot point of the tongue rod seat 20. Reference symbol list 10) Tool stand 11) first end surface 110) Joint guide hole 110') Joint pin 12) second end surface 120) Seat hole 121) Mounting hole 122) Fixing pin 20) Tongue rod seat 21) Joint pin 21') Joint guide hole 22) Plug opening 220) Thru axle 23) Guide groove 24) Evasive lane 25) Stop piece 30) Tongue rod 31) Tongue end 32) Guide section 33) Actuating part 40) Decentralized positioning part 41) Rotating end 42) Drive end 420) Drive notch 43) Damping part 44) Actuating part 50) Push part 51) Fixing pin 52) Positioning part 520) Through hole 53) Top stop 531) Pressing 54) Spring-loaded 60) Fine-tuning seat 61) Decentralized hole 62) Stop surface 620) Actuating element 70) Knife blade PL) Point PL1) Point PO) Basic position PO1) Basic position PR) Point PR1) Point QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2005000401

[0003] JP 2003167272

[0003]

Claims

[1] Position determination arrangement of a sewing machine with a decentrally driven tongue rod seat, wherein the tongue rod seat (20) is mounted on the tool stand (10) of the sewing machine and is provided with a tongue rod (30), wherein the position determination arrangement of the tongue rod seat (20) comprises the following components: • a decentralized positioning part (40) which is arranged between the tongue rod seat (20) and the tool block (10) and is designed with a rotating end (41) on the side of the tool block (10) and a drive end (42) on the side of the tongue rod seat (20), wherein the decentralized positioning part (40) rotates about the rotating end (41) as an axis and the drive end (42) projects into a socket opening (22) of the tongue rod seat (20) in order to drive the tongue rod seat, wherein the drive end (42) is decentralized to the rotating end (41), and • a joint guide hole (110) arranged between the tongue rod seat (20) and the tool block (10) and a complementary joint pin (21) with which the tongue rod seat (20) can rotate on the tool block (10), wherein the decentered positioning part (40) rotates about the rotating end (41) as an axis and the decentered drive end (42) takes the tongue rod seat (20) with it to pivot to a desired setting position with the joint pin (21) as a pivot point. [2] Position determination arrangement according to claim 1, characterized by, that the top of the tool block (10) is formed with a first end surface (11) and a second end surface (12), wherein the first end surface (11) is higher than the second end surface (12) and is provided with a joint guide hole (110) for receiving the joint pin (21) projecting from the bottom of the tongue rod seat (20), wherein a knife blade (70) is arranged on one side of the first end surface (11) of the tool block (10). [3] Position determination arrangement according to claim 1, characterized by , that a pressure part (50) is attached to the tool block (10), which is provided with a top stop (53) extending towards the tongue rod seat (20) and with this top stop (53) restricts the tongue rod (30) within the tongue rod seat (20), wherein the pressure part (50) is further provided with a spring-loaded end (54) for buffering the moving decentralized positioning part (40). [4] Position determination arrangement according to claim 3, characterized by , that the decentralized positioning part (40) is further provided between the drive end (42) and the rotating end (41) with a damping part (43) arranged around the rotating end (41) as an axis center, which cooperates with the spring-pressing end (54) for elastic buffering, wherein an actuating part (44) extends from one side of the damping part (43). [5] Position determination arrangement according to claim 4, characterized by, that the tongue rod (30) has a tongue end (31), a guide part (32) extending from the tongue end (31) and an actuating part (33) arranged perpendicular to the guide part (32), wherein the tongue rod seat (20) is formed with a guide groove (23) for sliding the guide part (32) and a clearance groove (24) for receiving the extending actuating part (33) is arranged on the side of the guide groove (23), wherein the flank of the tongue rod seat (20) cooperates with the actuating part (44) of the decentralized positioning part (40) to limit the rotation angle of the decentralized positioning part (40). [6] Position determination arrangement according to claim 2, characterized by, that a fine adjustment seat (60) is arranged on the second end surface (12) of the tool block (10), which is designed with a decentralized hole (61) for receiving the inserted rotating end (41), wherein an actuating element (620) is further arranged on the top of the fine adjustment seat (60). [7] Position determination arrangement provided with a decentrally driven tongue rod seat, wherein the tongue rod seat is mounted on the tool stand (10) of a sewing machine and is provided with a tongue rod (30), wherein the position determination arrangement of the tongue rod seat (20) comprises the following components: • a decentralized positioning part (40) which is arranged between the tongue rod seat (20) and the tool block (10) and is formed with a rotating end (41) on the side of the tool block (10) and a drive notch (420) on the side of the tongue rod seat (20), wherein the decentralized positioning part (40) rotates about the rotating end (41) as an axis and the drive notch (420) serves to receive or drive a plug-in shaft (220) extending from the tongue rod seat (20), wherein the plug-in shaft (220) is located decentrally to the rotating end (41), and • a joint guide hole (110) arranged between the tongue rod seat (20) and the tool block (10) and a complementary joint pin (21) with which the tongue rod seat (20) can rotate on the tool block (10), wherein the decentralized positioning part (40) rotates about the rotating end (21) as an axis and the drive notch (420) takes the plug-in axis (220) with it so that the tongue rod seat (20) pivots with the joint pin (21) as a pivot point to a desired setting position. [8] Position determination arrangement according to claim 7, characterized by, that the top of the tool block (10) is formed with a first end surface (11) and a second end surface (12), wherein the first end surface (11) is higher than the second end surface (12) and is provided with a joint guide hole (110) for receiving the joint pin (21) projecting from the bottom of the tongue rod seat (20), wherein a knife blade (70) is arranged on one side of the first end surface (11) of the tool block (10). [9] Position determination arrangement according to claim 7, characterized by , that a pressure part (50) is attached to the tool block (10), which is provided with a top stop (53) extending towards the tongue rod seat (20) and with this top stop (53) restricts the tongue rod (30) within the tongue rod seat (20), wherein the pressure part (50) is further provided with a spring-loaded end (54) for buffering the moving decentralized positioning part (40). [10] Position determination arrangement according to claim 9, characterized by , that the decentralized positioning part (40) is further provided between the drive end (42) and the rotating end (41) with a damping part (43) arranged around the rotating end (41) as an axis center, which cooperates with the spring-pressing end (54) for elastic buffering, wherein an actuating part (44) extends from one side of the damping part (43). [11] Position determination arrangement according to claim 10, characterized by, that the tongue rod (30) has a tongue end (31), a guide part (32) extending from the tongue end (31) and an actuating part (33) arranged perpendicular to the guide part (32), wherein the tongue rod seat (20) is formed with a guide groove (23) for sliding the guide part (32) and a clearance groove (24) for receiving the extending actuating part (33) is arranged on the side of the guide groove (23), wherein the flank of the tongue rod seat (20) cooperates with the actuating part (44) of the decentralized positioning part (40) to limit the rotation angle of the decentralized positioning part (40). [12] Position determination arrangement according to claim 8, characterized by, that a fine adjustment seat (60) is arranged on the second end surface (12) of the tool block (10), which is designed with a decentralized hole (61) for receiving the inserted rotating end (41), wherein an actuating element (620) is further arranged on the top of the fine adjustment seat (60).

Images