extension set

Abstract

The utility model provides a kind of inner wire machine, mainly with sewing body and rocker body, sewing body is equipped with upper shaft and cutter driving mechanism, and rocker body is equipped with cutter mechanism, in addition, cutter mechanism has movable cutter, ring gear, two cutter transmission rods, linkage bevel gear and cutter relay gear, ring gear is rotatably connected in the bearing seat of sewing body, and the peripheral tooth part of ring gear is engaged in cutter driving mechanism, in addition, two cutter transmission rods are connected with each other, one of cutter transmission rods is connected linkage bevel gear to engage in the end surface tooth part of ring gear, and another cutter transmission rod is connected cutter relay gear to be connected in movable cutter, whereby, the inner wire machine of the case is driven movable cutter by upper shaft, avoid the need for additional installation electric control device to drive movable cutter.

Description

Technical Field

[0001] This utility model relates to an inner thread sewing machine for sewing shoes, and more particularly to an inner thread sewing machine that can drive a cutting mechanism via an upper shaft to perform thread cutting operations. Background Technology

[0002] Sewing machines primarily combine multiple layers of fabric by stitching together. With continuous technological advancements, there are now various types of sewing machines on the market, each suitable for different fabric types. Among them, there is currently an inner thread sewing machine available that can be used to sew the upper and sole of shoes.

[0003] The operation of the inner thread sewing machine mainly relies on the rocker arm body that can swing back and forth to perform sewing operations. When the inner thread sewing machine is used to sew shoes, the slanted opening of the shoe is fitted into the shuttle head located at the end of the rocker arm body. As the rocker arm body swings back and forth, the sole of the shoe goes around once, allowing the main shaft to drive the needle to pass through the area around the sole of the shoe, so that the needle thread can interweave with the bottom thread, thereby forming a lockstitch around the sole of the shoe.

[0004] However, after the existing sewing machine completes the sewing operation, the user has to manually cut the thread. This not only makes the sewing process of the existing sewing machine inconvenient, but also prolongs the overall sewing time of the existing sewing machine, thus preventing the production efficiency of the existing sewing machine from being improved. Furthermore, when the existing sewing machine is sewing shoes with a narrow internal space, the user often finds it difficult to cut the needle and thread directly inside the shoe due to the limited space inside the shoe. Instead, the needle and thread must be pulled to the shoe opening to be cut, resulting in the waste of needle and thread.

[0005] Therefore, considering the shortcomings of existing intercom systems, it is necessary to innovate and improve their functions to enhance their ease of use and thereby increase their production efficiency. Utility Model Content

[0006] The main purpose of this utility model is to provide an internal line machine that allows the upper shaft of the internal line machine to drive the cutting mechanism to perform line cutting operations, thereby avoiding the need for an additional electrical control device to drive the movable cutter, which can reduce the electrical control cost of the internal line machine.

[0007] The secondary objective of this utility model is to provide an internal line machine in which, when the rocker arm body swings while the upper shaft of the internal line machine is stationary, the movable cutter of the cutter mechanism will not swing with the rocker arm body, thereby facilitating the maintenance or replacement of the cutter when the internal line machine is stopped.

[0008] To achieve the aforementioned objective, this utility model provides an inner thread sewing machine, which has a sewing body, a bearing seat connected to the sewing body, and a rocker arm body that can swing relative to the sewing body. The sewing body has a rotatable upper shaft inside and is equipped with a cutting drive mechanism. The rocker arm body has a cutting mechanism inside that is connected to the cutting drive mechanism. The cutting mechanism includes: a movable cutter, a ring gear, two cutting drive rods, a connecting bevel gear, and a connecting bevel gear.

[0009] The ring gear is rotatably connected to the bearing housing and meshes with the cutter drive mechanism. The two cutter drive rods are interconnected, with one cutter drive rod connected to the linkage bevel gear and the other cutter drive rod connected to the cutter relay gear. The linkage bevel gear meshes with the ring gear, and the cutter relay gear is connected to the movable cutter.

[0010] In this embodiment, the ring gear is coaxially sleeved on the bearing housing, such that the axis of the ring gear overlaps with the axis of the bearing housing. The ring gear has an outer tooth portion located around the ring gear and an end face tooth portion located on the end face of the ring gear. The outer tooth portion meshes with the cutter drive mechanism, while the end face tooth portion meshes with the connecting bevel gear.

[0011] In addition, the cutter drive mechanism includes: a transmission cam, a linkage component, a movable component and a drive component.

[0012] The transmission cam is connected to the upper shaft and can rotate synchronously with the upper shaft. The linkage component is connected to the cutter mechanism. In addition, the movable component is movably connected to a swing arm support shaft of the sewing body and the linkage component. The movable component can rotate or move relative to the swing arm support shaft and the linkage component simultaneously. When the movable component is in a stationary position positioned at the tangent recess of the sewing body, the movable component cannot rotate relative to the swing arm support shaft. Then, the drive component is used to drive the movable component to move relative to the linkage component, so that the movable component moves from the stationary position to a movable position separated from the tangent recess. Then, the movable component is connected to the transmission cam, and the rotating cam can drive the movable component to rotate, so that the linkage component drives the movable cutter of the cutter mechanism.

[0013] In this embodiment, the cutter drive mechanism further includes a return spring that generates a reset force acting on the movable component, allowing the movable component to move from the active position to the stationary position by means of the reset force.

[0014] The drive assembly has a swing arm and a driver. The central region of the swing arm is pivotally connected to the sewing body, and the driver can drive a telescopic rod to extend toward one end of the swing arm, so that the other end of the swing arm can push the movable assembly to the movable position.

[0015] Additionally, the movable component includes a tangent-driven swing arm, a tangent-swing rod, and a tangent-threading component. The tangent-driven swing arm is movably connected to the sewing body, while one end of the tangent-swing rod is pivotally connected to the tangent-driven swing arm and the other end is movably connected to the linkage component. The tangent-threading component is disposed on the tangent-driven swing arm and movably connected to the tangent-swing rod, and can be threaded into the tangent recess when the movable component is in the stationary position.

[0016] The tangential drive swing arm is provided with a first tangential drive swing arm and a second tangential drive swing arm arranged at intervals between the first tangential drive swing arm and the second tangential drive swing arm. The first tangential drive swing arm and the second tangential drive swing arm are respectively equipped with a first roller and a second roller. A first roller groove and a second roller groove are respectively formed on opposite sides of the transmission cam. When the movable component is in the movable position, the first roller groove can accommodate the first roller.

[0017] Furthermore, the drive assembly is connected to the outside of the sewing body, and the tangent drive swing member, tangent swing rod, and tangent threading member are all disposed inside the sewing body. The movable assembly further has a tangent push pin, which passes through the sewing body such that a portion of the tangent push pin is located inside the sewing body to connect with the tangent drive swing member, while the remaining portion of the tangent push pin is located outside the sewing body adjacent to the drive assembly.

[0018] The swing arm support is located inside the sewing body and can be fitted by the tangent drive swing piece. The tangent push pin has a connecting horizontal section that can pass through the inside of the swing arm support to the outside of the sewing body and a connecting vertical section that intersects with the connecting horizontal section. The connecting vertical section can pass through the swing arm support to connect to the tangent drive swing piece.

[0019] The swing arm support shaft extends inward to form a support shaft guide rail with a profile larger than the connecting longitudinal section. The connecting longitudinal section can pass through the support shaft guide rail. When the movable component moves relative to the swing arm support shaft to the stationary or movable position, the connecting longitudinal section can approach one end of the support shaft guide rail.

[0020] The feature of this utility model is that the cutting mechanism is mainly composed of a movable cutter, a ring gear, two cutting drive rods, a connecting bevel gear, and a cutting relay gear. The outer teeth of the ring gear mesh with the cutting drive mechanism. One cutting drive rod is connected to the connecting bevel gear to mesh with the ring gear at the end face teeth, while the other cutting drive rod is connected to the cutting relay gear to connect with the movable cutter. In this way, the upper shaft can drive the movable cutter of the cutting mechanism to perform line cutting operations, thereby avoiding the need for an additional electrical control device to drive the movable cutter in the inner line machine, thus significantly reducing the electrical control cost of the inner line machine.

[0021] In addition, the cutter drive mechanism is located between the upper shaft and the cutter mechanism. Therefore, when the rocker arm of the liner swings while the upper shaft is stationary, the moving cutter of the cutter mechanism will not swing with the rocker arm. This makes it easier to maintain or replace the cutter when the liner is stopped. Attached Figure Description

[0022] Figure 1 This is a perspective view of the internal wire cutter with tangential function according to this utility model;

[0023] Figure 2 A perspective view of the machine body showing the needle bar mechanism, thread hooking mechanism, needle plate holding mechanism, cutter mechanism and cutter drive mechanism;

[0024] Figure 3 The side view of the machine body shows the needle bar mechanism, hooking mechanism, needle plate holding mechanism, cutting mechanism and cutting drive mechanism.

[0025] Figure 4 An exploded view of the organism;

[0026] Figure 5 This is an exploded view of the hook mechanism;

[0027] Figure 6 for Figure 5 Exploded view of the center crochet hook body;

[0028] Figure 7 An exploded view of the needle plate holding mechanism;

[0029] Figure 8 This is an exploded view of the cutter mechanism connected to the bearing housing;

[0030] Figure 9 This is a schematic diagram showing the cutter assembly connected to the rotary hook base;

[0031] Figure 10 An exploded view of the cutter assembly connected to the rotary hook base;

[0032] Figure 11 This is a cross-sectional view of the cutter assembly connected to the rotary hook base;

[0033] Figure 12 This is a 3D view of the cutter drive mechanism;

[0034] Figure 13 A schematic diagram showing the drive components positioned outside the sewing machine body;

[0035] Figure 14 A perspective view of the transmission cam mounted on the upper shaft;

[0036] Figure 15 Another perspective view of the transmission cam mounted on the upper shaft;

[0037] Figure 16 for Figure 12 An exploded view of the active components;

[0038] Figure 17 for Figure 12 A cross-sectional view of the active component;

[0039] Figure 18A A schematic diagram showing how the actuator drives the swing arm to allow the first roller to enter the groove of the first roller;

[0040] Figure 18B This is a schematic diagram showing the connection between the longitudinal segment and the movable end;

[0041] Figure 18C This is a schematic diagram showing the first roller moving into the interior of the first rear section;

[0042] Figure 18D This is a schematic diagram showing the second roller moving into the interior of the second front section;

[0043] Figure 18E A schematic diagram of a sector gear rotating clockwise;

[0044] Figure 18F This is a schematic diagram showing how a sector gear drives a movable cutter via a cutter transmission assembly.

[0045] Figure 18G A schematic diagram showing the position where the moving cutter leaves the tangent line;

[0046] Figure 18H This is a schematic diagram showing the first roller moving out of the first roller groove;

[0047] Figure 18I This is a diagram illustrating the movement of the movable cutter to the position where the line is to be drawn.

[0048] Figure 18J This is a schematic diagram showing the second roller moving into the second rear section;

[0049] Figure 18K A schematic diagram showing the movement of the movable cutter from the position to be outlined to the outlined position;

[0050] Figure 18L This is a schematic diagram showing the second roller moving out of the second roller groove;

[0051] Figure 18M A schematic diagram showing the movable cutter returning to the tangent position;

[0052] Figure 18N This is a schematic diagram of a rotary hook bearing a ring in another state;

[0053] Figure 18O A schematic diagram showing the moving component moving to a stationary position via a return spring;

[0054] Figure 18P This is a schematic diagram showing the connection of the longitudinal segment to the stationary end;

[0055] Figure 19A This is a schematic diagram showing the rocker arm body in the middle position of its swing range;

[0056] Figure 19B A schematic diagram showing the rocker arm swinging forward to cover the entire fixed cutter;

[0057] Figure 19C This is a schematic diagram showing how the rocker arm body swings backward to align the slot with the entire fixed cutter.

[0058] Explanation of reference numerals in the attached drawings: 1-Inner thread sewing machine; 10-Machine body; 11-Sewing body; 111-Sewing head; 112-Support column; 113-Swing arm support shaft; 113a-Support shaft guide rail; 113b-Stationary end; 113c-Moving end; 114-Tying recess; 115-C-ring; 12-Rocker arm body; 121-Rocker arm; 122-Rocker handle; 123-Bolt holder; 124-Bolt cover; 125-Hook thread mounting channel; 126-Needle plate mounting channel; 127-Cutter mounting channel; 128-Bolt space; 129-Slot; 13-Bearing seat; 14-Pivot seat; 20-Sewing drive mechanism; 21-Upper shaft; 22-Lower shaft; 30-Needle bar mechanism; 31-Needle bar; 32-Needle; 40-Hook thread mechanism ; 41-Hook drive assembly; 411-Hook belt drive system; 411a-Hook drive wheel; 411b-Hook driven wheel; 411c-Hook belt; 411d-Hook universal joint; 412-Hook linkage drive system; 412a-Hook linkage; 412b-Hook relay gear; 413-Hook drive; 42-Hook body; 421-Hook; 422-Needle plate; 422a-Needle hole; 423-Hook base; 423a-Needle plate positioning gear; 423a1-Outer ring; 423a2-Inner ring; 423a3-Positioning teeth; 423a4-Positioning groove; 423a5-Gear contact surface; 423b-Hook bearing ring; 423b1-Connecting ring; 423b2-Bearing ring flange; 423b3 - Connecting groove; 423b4 - Positioning block; 423b5 - Groove sidewall; 423b6 - Thread hanging edge; 424 - Shuttle case; 50 - Needle plate holding mechanism; 51 - Needle plate belt drive system; 511 - Needle plate fixed wheel; 512 - Needle plate movable wheel; 513 - Needle plate belt; 514 - Needle plate universal joint; 52 - Needle plate connecting rod drive system; 521 - Needle plate connecting rod; 522 - Needle plate relay gear; 60 - Cutting mechanism; 61 - Cutting drive assembly; 611 - Ring gear; 611a - Peripheral teeth; 611b - End face teeth; 612 - Cutting drive rod; 612a - First cutting drive rod; 612b - Second cutting drive rod; 613 - Linking bevel gear; 614 - First relay bevel gear; 6 15-Second relay bevel gear; 616-Cutter relay gear; 62-Cutter assembly; 621-Modible cutter; 621a-Connecting tooth; 621b-Modible blade; 621b1-Hook groove; 621b2-Modible blade edge; 621b3-Wire groove; 622-Fixed cutter; 622a-Fixed connection; 622b-Fixed blade; 70-Cutter drive mechanism; 71-Drive assembly; 711-Swing rod; 712-Driver; 713-Telescopic rod; 72-Transmission cam; 721-First roller groove; 721a-First front section; 721b-First rear section; 722-Second roller groove; 722a-Second front section; 722b-Second rear section; 723-First front opening; 724-First rear opening;725 - Second front opening; 726 - Second rear opening; 73 - Linkage assembly; 731 - Linkage shaft; 732 - Sector gear; 733 - Swing wrist; 74 - Movable assembly; 741 - Tangential drive swing arm; 741a - Sleeve; 741b - Tangential drive swing arm; 741b1 - First tangential drive swing arm; 741b2 - Second tangential drive swing arm; 741c - Tangential connecting arm; 741d - First roller; 741e - Second roller 742-Tangent lever; 743-Tangent thread insert; 744-Tangent push pin; 744a-Connecting horizontal section; 744b-Connecting vertical section; 75-Return spring; A1-Slotted area; A2-Cutter moving area; B1-Static position; B2-Moving position; C1-Tangent position; C2-Hooking position; C3-Hooking position; D1-Covered state; D2-Exposed state; F-Returning force; L1-Needle and thread; L2-Board thread. Detailed Implementation

[0059] The present invention will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of the present invention will become clearer with the description.

[0060] In the accompanying drawings, the two sides of the X-axis refer to the left and right sides of the operator facing the internal line machine 1 of this utility model, the two sides of the Y-axis refer to the front and rear sides of the operator facing the internal line machine 1 of this utility model, and the two sides of the Z-axis refer to the upper and lower sides of the operator facing the internal line machine 1 of this utility model with tangential function. Furthermore, in this specification, directional terms such as "left," "right," "front," "back," "up," and "down" refer to the directions presented when the operator faces the internal line machine 1 of this utility model with tangential function.

[0061] Please see Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides an inner thread sewing machine 1 with a cutting function, mainly composed of a machine body 10, a sewing drive mechanism 20, a needle bar mechanism 30, a thread hooking mechanism 40, a needle plate holding mechanism 50, a cutting knife mechanism 60, and a cutting knife drive mechanism 70. Please refer to [link / reference needed]. Figure 1 and Figure 4As shown, the machine body 10 has four parts: a sewing body 11, a rocker arm body 12, a bearing seat 13, and a pivot seat 14. A portion of the sewing body 11 is a sewing head 111, while the remaining portion of the sewing body 11 has a support column 112 connected to the bearing seat 13. Inside the sewing head 111, on the right side wall, is a hollow rocker arm support shaft 113 and a tangential recess 114 spaced apart from the rocker arm support shaft 113. The rocker arm support shaft 113 is parallel to the X-axis, and a support shaft guide rail 113a is formed through the side of the rocker arm support shaft 113, connecting to the interior of the rocker arm support shaft 113. The two ends of the support shaft guide rail 113a are respectively a stationary end 113b and a movable end 113c. Additionally, the rocker arm body 12 has a rocker arm 121 connected to the pivot seat 14, a rocker handle 122 connected to the rocker arm 121, and a support column 14 connected to the pivot seat 14. The rocker handle 122 has a bobbin holder 123 and a bobbin cover 124 connected to the bobbin holder 123. The interior of the rocker handle 122 forms a hook thread mounting channel 125, a needle plate mounting channel 126, and a cutter mounting channel 127. These three channels are arranged close to each other and parallel to one another. A bobbin space 128 is formed through the central area of ​​the bobbin cover 124 along the X-axis. The upper part of the bobbin cover 124 has a slot 129 communicating with the bobbin space 128. A pivot seat 14 is pivotally connected to a bearing seat 13, allowing the rocker arm body 12 to be pivotally connected to the sewing body 11 via the pivot seat 14. This allows the rocker arm body 12 to swing relative to the sewing body 11 about the X-axis, causing the area traversed by the slot 129 to be designated as a slotted area A1 (e.g., ...). Figure 19A (As shown).

[0062] Please see Figure 1 and Figure 3 As shown, the sewing drive mechanism 20 is connected to the machine body 10. The sewing drive mechanism 20 mainly comprises four parts: a main drive source (not shown), an upper shaft 21, a lower shaft 22, and a sewing transmission assembly (not shown). The main drive source is connected to the outside of the machine body 10. The upper shaft 21 is arranged parallel to the X-axis inside the sewing head 111 of the sewing body 11, so that the upper shaft 21 is parallel to the swing arm support shaft 113 of the sewing body 11. Furthermore, the upper shaft 21 is driven by the main drive source to... The upper shaft 21 rotates, and the lower shaft 22 is arranged in parallel below the upper shaft 21. The lower shaft 22 can pass through the bearing seat 13 and the pivot seat 14 of the machine body 10 at the same time, so that a part of the lower shaft 22 is located inside the support 112 of the sewing body 11, and the remaining part of the lower shaft 22 is located inside the rocker arm 121 of the rocker arm body 12. The sewing transmission assembly is used to transmit the power of the upper shaft 21 to the lower shaft 22, so that the upper shaft 21 can drive the lower shaft 22 to rotate via the sewing transmission assembly.

[0063] Please see Figure 2 and Figure 3 As shown, the needle bar mechanism 30 is disposed at the head 111 of the sewing body 11. The needle bar mechanism 30 has a needle bar 31 and a needle 32. The needle bar 31 is located above the slot 129 of the bobbin cover 124. The needle bar 31 is driven by the upper shaft 21 of the sewing drive mechanism 20 and can reciprocate along the Z-axis. The needle 32 is connected to one end of the needle bar 31, so that the needle 32 can reciprocate synchronously with the needle bar 31. Thus, the needle 32 can pass through the slot 129 and enter the bobbin space 128 of the bobbin cover 124.

[0064] Please see Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the hooking mechanism 40 is disposed inside the rocker arm body 12 of the machine body 10. The hooking mechanism 40 has two parts: a hooking transmission assembly 41 and a hooking body 42. One end of the hooking transmission assembly 41 is connected to the lower shaft 22 of the sewing drive mechanism 20, and the other end is connected to the hooking body 42. This allows the hooking transmission assembly 41 to drive the hooking body 42 to perform hooking operations when the lower shaft 22 rotates. In this embodiment, the hooking transmission assembly 41 is located inside the rocker arm 12 of the rocker arm body 12. The assembly 1 internally includes a hook belt drive system 411 connected to the lower shaft 22 of the sewing drive mechanism 20. The hook drive assembly 41 also includes a hook linkage drive system 412 connected to the hook belt drive system 411. The hook belt drive system 411 has a hook drive wheel 411a connected to the lower shaft 22 and a hook driven wheel 411b spaced below the hook drive wheel 411a. The hook drive wheel 411a is connected to the hook driven wheel 411b via a hook belt 411c. The hooking driven wheel 411b is connected to the hooking linkage transmission system 412 via a hooking universal joint 411d. The hooking linkage transmission system 412 has a diagonally arranged hooking link 412a. The hooking link 412a can pass through the hooking mounting channel 125 of the rocker handle 122, allowing one end of the hooking link 412a to be inserted into the rocker arm 121 to connect to the hooking universal joint 411d, while the other end of the hooking link 412a can be inserted into the shuttle head bracket 123 of the rocker arm body 12. A hook relay gear 412b is connected to a hook head support 123. The hook relay gear 412b meshes with a rotary hook driver 413 that can rotate laterally around the X-axis. The rotary hook driver 413 is located between the hook head support 123 and the hook head cover 124. Thus, when the lower shaft 22 of the sewing drive mechanism 20 rotates, the rotating lower shaft 22 can drive the rotary hook driver 413 to rotate around the X-axis through the hook belt drive system 411 and the hook linkage drive system 412.

[0065] like Figure 2 , Figure 5 and Figure 6 As shown, the hook body 42 of the hook mechanism 40 is provided with three parts between the shuttle head support 123 of the rocker arm body 12 and the shuttle head cover 124 of the rocker arm body 12: a rotary hook 421, a needle plate 422, and a rotary hook base 423. The main function of the rotary hook 421 is to accommodate a shuttle shell 424. Furthermore, the rotary hook 421 is not only movably sleeved on the rotary hook base 423, but also interconnected with the rotary hook driver 413 of the hook transmission assembly 41, so that the rotary hook 421 can rotate relative to the rotary hook base 423 through the rotating rotary hook driver 413. The needle plate 422 is disposed inside the slot 129 of the shuttle head cover 124, so that the needle plate 422 is located on the needle bar. Below the needle 32 of mechanism 30, and the needle plate 422 is provided with a needle hole 422a through which the needle 32 can pass. In addition, the shuttle base 423 is located inside the shuttle head space 128 of the shuttle head cover 124 to connect the needle plate 422 and the needle plate holding mechanism 50. In this embodiment, the shuttle base 423 has a needle plate positioning gear 423a and a shuttle support ring 423b. The needle plate positioning gear 423a is located on the right side of the shuttle support ring 423b. The needle plate positioning gear 423a is configured as an outer ring portion 423a1 with a generally circular appearance and an inner ring portion 423a2 with a smaller profile than the outer ring portion 423a1. The outer edge of the outer ring portion 423a1 forms a certain... The positioning tooth portion 423a3 has a positioning groove 423a4 adjacent to the positioning tooth portion 423a3, and a gear contact surface 423a5 is formed between the outer ring portion 423a1 and the inner ring portion 423a2. In addition, a part of the rotary hook bearing ring 423b is configured as a connecting ring portion 423b1 connected to the needle plate 422 and a bearing flange 423b2 protruding from the connecting ring portion 423b1. The connecting ring portion 423b1 has a connecting groove 423b3 in the area near the needle plate 422 to connect to the needle hole 422a of the needle plate 422. Furthermore, the connecting ring portion 423b1 protrudes at a position spaced from the connecting groove 423b3 to form a positioning block 423b4. Each of the opposite sides of 23b3 is provided with a groove sidewall 423b5, and one end of the bearing ring flange 423b2 is provided with a thread hanging edge 423b6 that can block the sewing thread (such as needle thread L1 and bobbin thread L2). In this embodiment, the thread hanging edge 423b6 is simultaneously offset between the connecting groove 423b3 and the positioning block 423b4, so that the thread hanging edge 423b6 is close to the connecting groove 423b3 and away from the positioning block 423b4, as shown in the figure. The positioning block 423b4 is engaged inside the positioning groove 423a4, so that the inner ring part 423a2 can penetrate into the inside of the connecting ring part 423b1, and the gear contact surface 423a5 can contact the rotary hook bearing ring 423b.

[0066] Please see Figure 2 and Figure 7 As shown, the needle plate holding mechanism 50 is disposed inside the rocker arm body 12 to connect to the rotary hook base 423 of the hook body 42. In this embodiment, the needle plate holding mechanism 50 has a needle plate belt drive system 51 inside the rocker arm 121 of the rocker arm body 12 to connect to the bearing seat 13 of the machine body 10. Furthermore, the needle plate holding mechanism 50 is provided with a needle plate connecting rod drive system 52 connected to the needle plate belt drive system 51. The needle plate belt drive system 51 has a needle plate fixing wheel 511 fixed to the bearing seat 13 and a needle plate fixing wheel 511 spaced apart from the needle plate fixing wheel 511. The needle plate movable wheel 512 of wheel 511 and the needle plate fixed wheel 511 are connected to the needle plate movable wheel 512 by a needle plate belt 513 to form an angled positioning connection. Furthermore, the needle plate movable wheel 512 is connected to the needle plate linkage transmission system 52 via a needle plate universal joint 514. In addition, the needle plate linkage transmission system 52 adopts a diagonally arranged needle plate linkage 521. The needle plate linkage 521 can pass through the needle plate mounting channel 126 of the crank handle 122, so that the needle plate linkage 521 and the hook linkage 412a of the hook linkage transmission system 412 are parallel to each other. One end of the needle plate connecting rod 521 can be inserted into the interior of the rocker arm 121 to connect to the needle plate universal joint 514, while the other end of the needle plate connecting rod 521 can be inserted into the interior of the shuttle head bracket 123 of the rocker arm body 12 to connect to a needle plate relay gear 522 disposed inside the shuttle head bracket 123. The needle plate relay gear 522 meshes with the positioning teeth 423a3 of the needle plate positioning gear 423a. Thus, when the rocker arm body 12 of the machine body 10 swings forward, the needle plate movable wheel 512 rotates around the bearing seat 13 as the axis through the forward swinging rocker arm body 12. The needle plate movable wheel 512, which revolves around the center, is connected to the needle plate fixed wheel 511 via the needle plate belt 513 and can rotate on its own axis. The rotating needle plate movable wheel 512 can drive the needle plate relay gear 522 to rotate on its own axis via the needle plate connecting rod 521. The rotating needle plate relay gear 522 will revolve around the rotary hook base 423 as the axis, so that the needle plate 422 can remain stationary during the swing of the rocker arm body 12. In this way, the function of the needle plate holding mechanism 50 is to keep the rotary hook base 423 and the needle plate 422 from swinging with the rocker arm body 12.

[0067] Please see Figure 2 , Figure 8 , Figure 9 and Figure 10As shown, the cutting mechanism 60 comprises two main components: a cutting blade transmission assembly 61 and a cutting blade assembly 62. Both the cutting blade transmission assembly 61 and the cutting blade assembly 62 are disposed inside the rocker arm body 12 of the machine body 10. The cutting blade transmission assembly 61 connects the cutting blade drive mechanism 70 and the cutting blade assembly 62. In this embodiment, the cutting blade transmission assembly 61 has a ring gear 611 and two cutting blade transmission rods 612. The ring gear 611 is rotatably connected to the bearing seat 13 of the machine body 10. The ring gear 611 has a peripheral tooth 611a located around its periphery and an end tooth 611b located on its end face. In this embodiment, the ring gear 611 is coaxially sleeved on the bearing seat 13, such that the axis of the ring gear 611 overlaps with the axis of the bearing seat 13. One of the cutting blade transmission rods 612 is disposed on the rocker arm body 12. The rocker arm 121 is internally configured with a first cutter drive rod 612a, and another cutter drive rod 612b can pass through the cutter mounting channel 127 of the rocker handle 122. One end of the first cutter drive rod 612a is equipped with a connecting bevel gear 613 to mesh with the end face tooth 611b of the ring gear 611. A first relay bevel gear 614 is installed at the end of the first cutter drive rod 612a away from the connecting bevel gear 613. One end of the second cutter drive rod 612b protrudes outward from the cutter mounting channel 127 and is connected to a second relay bevel gear 615 that meshes with the first relay bevel gear 614. A cutter relay gear 616 is installed at the end of the second cutter drive rod 612b away from the second relay bevel gear 615, and the cutter relay gear 616 is located inside the spindle cover 124 of the rocker arm body 12.

[0068] Please see Figure 8 , Figure 9 , Figure 10 and Figure 11As shown, the cutter assembly 62 of the cutter mechanism 60 is disposed inside the shuttle head cover 124 of the rocker arm body 12. The cutter assembly 62 has two parts: a movable cutter 621 and a fixed cutter 622. As shown in the figure, the movable cutter 621 has a ring-shaped shape. The periphery of the movable cutter 621 is provided with a connecting tooth 621a and a movable cutting edge 621b located on one side of the connecting tooth 621a. The movable cutter 621 is rotatably fitted onto the bearing flange of the rotary shuttle bearing ring 423b. 423b2, such that the connecting tooth 621a meshes with the cutting relay gear 616 of the cutting drive assembly 61, while the movable blade 621b can be located on the periphery of the bearing ring flange 423b2. In this embodiment, the movable blade 621b is provided with a hook groove 621b1 for hooking the thread and a movable blade 621b2 spaced apart from the hook groove 621b1. A guide groove 621b3 for accommodating the thread is provided between the hook groove 621b1 and the movable blade 621b2. In addition, the fixed... The cutter 622 has a sheet-like fixed connecting portion 622a and a fixed cutting edge portion 622b extending from the fixed connecting portion 622a. The fixed connecting portion 622a is connected to the connecting ring portion 423b1 of the rotary hook bearing ring 423b at a position close to the positioning block 423b4, so that the fixed cutter 622 is moved away from the hanging edge 423b6 of the bearing ring flange 423b2. The fixed cutting edge portion 622b protrudes outward from the connecting ring portion 423b1 and is spaced apart on the outer side of the bearing ring flange 423b2. The flange 423b2 and the fixed blade 622b form a cutting tool movement area A2. When the movable cutter 621 can rotate on the rotary shuttle bearing ring 423b, the movable blade 621b can pass sequentially through the hanging edge 423b6 of the bearing ring flange 423b2 and the interior of the cutting tool movement area A2. In this embodiment, when the fixed connecting part 622a is connected to the connecting ring part 423b1, the fixed cutter 622 is adjacent to the slotted area A1 of the slot 129.

[0069] Please see Figure 2 and Figure 12 As shown, the cutter drive mechanism 70 has five parts: a drive assembly 71, a transmission cam 72, a linkage assembly 73, a movable assembly 74, and a return spring 75. Figure 13 As shown, the drive assembly 71 has a swing arm 711 and a driver 712. The central region of the swing arm 711 is pivotally connected to the outside of the support column 112 of the sewing body 11, and the driver 712 is connected to the outside of the support column 112. The driver 712 is an electromagnet, which enables the driver 712 to drive a telescopic rod 713 to extend toward one end of the swing arm 711. The telescopic rod 713 can then push the swing arm 711, allowing the swing arm 711 to swing relative to the support column 112.

[0070] like Figure 14 and Figure 15As shown, the transmission cam 72 is connected to the upper shaft 21 of the sewing drive mechanism 20, enabling the transmission cam 72 to rotate synchronously with the upper shaft 21. The opposite end faces of the transmission cam 72 are recessed to form a first roller groove 721 and a second roller groove 722. The first roller groove 721 extends from one end face of the transmission cam 72 to its periphery, with both ends of the first roller groove 721 positioned on the periphery of the transmission cam 72, forming a first front opening 723 and a first rear opening 724 spaced apart from the first front opening 723, respectively. The second roller groove 722 extends from the other end face of the transmission cam 72 to its periphery, with one end of the second roller groove 722 positioned on the periphery of the transmission cam 72, forming a second front opening 725. The other end of the second roller groove 722 is also positioned on the periphery of the transmission cam 72, forming a second rear opening 726 spaced apart from the second front opening 725. The roller groove 721 is divided into a first front section 721a connected to the first front opening 723 and a first rear section 721b connected to the first rear opening 724. The second roller groove 722 is provided with a second front section 722a connected to the second front opening 725 and a second rear section 722b connected to the second rear opening 726. Furthermore, the linkage component 73 is simultaneously connected to the support column 112 of the sewing body 11 and the ring gear 611 of the cutting mechanism 60. In this embodiment, the linkage component 73 has… There is a connecting shaft 731 pivotally connected to the support column 112, a sector gear 732 disposed outside the support column 112, and a swing arm 733 disposed inside the support column 112. The connecting shaft 731 is arranged in parallel below the upper shaft 21 of the sewing drive mechanism 20, and the connecting shaft 731 can rotate relative to the support column 112. The sector gear 732 is connected to the end of the connecting shaft 731 to mesh with the outer teeth 611a of the ring gear 611, and the swing arm 733 is connected to the connecting shaft 731.

[0071] Please see Figure 2 , Figure 16 and Figure 17 As shown, the movable component 74 of the cutter drive mechanism 70 is movably connected to the swing arm support shaft 113 of the sewing body 11 and the swing wrist 733 of the linkage component 73. The movable component 74 has a degree of freedom of movement relative to the swing arm support shaft 113, allowing it to move along the swing arm support shaft 113 and a degree of rotational freedom of rotation about the swing arm support shaft 113. The movable component 74 also has a degree of freedom of movement relative to the swing wrist 733 and a degree of rotational freedom of rotation relative to the swing wrist 733, allowing the movable component 74 to rotate or move simultaneously relative to the sewing body 11 and the linkage component 73. Please refer to [link to relevant documentation]. Figure 12 , Figure 14 , Figure 15 , Figure 16 and Figure 17 As shown, in this embodiment, the movable component 74 mainly consists of a tangential drive rocker 741, a tangential rocker arm 742, a tangential threading member 743, and a tangential push pin 744. The tangential drive rocker 741 is movably connected to the rocker arm support shaft 113. The tangential drive rocker 741 is provided with a sleeve 741a set on the rocker arm support shaft 113, two tangential drive rocker arms 741b extending from the sleeve 741a, and a tangential connecting arm 741c extending from the sleeve 741a. One of the tangential drive rocker arms 741b is close to the first roller groove 721 of the transmission cam 72 to serve as a first tangential drive. The first tangential drive swing arm 741b1 is pivotally connected to a first roller 741d. The second tangential drive swing arm 741b2, located around the transmission cam 72, is pivotally connected to a second roller 741e. Additionally, one end of the tangential swing arm 742 is pivotally connected to the tangential connecting arm 741c, and the end of the tangential swing arm 742 furthest from the tangential connecting arm 741c is movably connected to the swing wrist 733. This allows the tangential swing arm 742 to not only move axially with the swing wrist 733, but also to move relative to the swing wrist 733. 3. Rotation is performed, and the tangent threading member 743 passes through both the tangent drive swing member 741 and the tangent swing rod 742, so that the tangent connecting arm 741c is movably connected to the tangent swing rod 742 through the tangent threading member 743. The tangent push pin 744 passes through the support column 112 of the sewing body 11, with a portion of the tangent push pin 744 located inside the sewing body 11 to connect to the tangent drive swing member 741, and the remaining portion located outside the sewing body 11 adjacent to the swing rod 711 of the drive assembly 71. In this embodiment, a portion of the tangent push pin 744 is arranged laterally as a single... The connecting horizontal segment 744a is connected to the remaining portion of the tangential push pin 744, which intersects with the connecting horizontal segment 744a to form a connecting vertical segment 744b, so that the tangential push pin 744 has a T-shaped shape. The connecting horizontal segment 744a passes through the inside of the swing arm support shaft 113 to the outside of the support column 112, so that the end of the connecting horizontal segment 744a is adjacent to the swing rod 711. The connecting vertical segment 744b can pass through the support shaft guide rail 113a of the swing arm support shaft 113 to connect to the sleeve 741a of the tangential drive swing member 741. In this embodiment, the diameter of the connecting vertical segment 744b is smaller than the width of the support shaft guide rail 113a.

[0072] like Figure 2 , Figure 12 and Figure 17As shown, the return spring 75 of the cutter drive mechanism 70 is sleeved on the swing arm support shaft 113 of the sewing body 11, so that the return spring 75 is located on the periphery of the swing arm support shaft 113. One end of the return spring 75 abuts against a C-ring 115 installed on the swing arm support shaft 113, and the other end of the return spring 75 abuts against the sleeve 741a of the tangent drive swing member 741, so that the C-ring 115 and the tangent drive swing member 741 can jointly press against the return spring 75, thereby the return spring 75 will deform to form a return force F acting on the movable component 74. Thus, the movable component 74 moves along the swing arm support shaft 113 by the return force F, so that the connecting longitudinal section 744b of the tangent push pin 744 is close to the stationary end 113b of the support shaft guide rail 113a, so that the movable component 74 is in a stationary position B1 (e.g., Figure 18M As shown), when the movable component 74 is in the stationary position B1, the tangent thread insert 743 of the movable component 74 will pass into the tangent recess 114 of the sewing body 11 to restrict the movable component 74 from rotating relative to the swing arm support 113. At the same time, the first roller 741d of the first tangent drive swing arm 741b1 is located outside the first roller groove 721 of the transmission cam 72, so that the movable component 74 is not connected to the transmission cam 72.

[0073] Please see Figures 18A to 18O As shown, this is a specific application of the cutter drive mechanism 70 driving the cutter mechanism 60 to perform a cutting operation. First, as... Figure 18A and Figure 18BAs shown, when the driver 712 of the drive assembly 71 is activated (the electromagnet is energized), the driver 712 drives the telescopic rod 713 of the drive assembly 71 to extend outward. The telescopic rod 713 then contacts one end of the swing rod 711 to push the swing rod 711, allowing the swing rod 711 to swing clockwise relative to the support column 112. The other end of the swing rod 711 contacts the connecting transverse section 744a of the tangent push pin 744. The clockwise swinging swing rod 711 drives the movable component 74 of the cutter drive mechanism 70 to move away from the rest position B1 along the swing arm support shaft 113 of the sewing body 11, allowing the connecting longitudinal section 744b of the tangent push pin 744 to approach the support shaft guide. The movable end 113c of the guide rail 113a causes the movable component 74 to move simultaneously relative to the sewing body 11 of the machine body 10, the cutter drive mechanism 70, and the linkage component 73. When the connecting longitudinal section 744b touches the movable end 113c of the support shaft guide rail 113a, the movable component 74 is in a movable position B2, and the tangent thread insert 743 of the movable component 74 will leave the tangent thread recess 114 of the sewing body 11. As a result, the movable component 74 can rotate relative to the swing arm support shaft 113. At the same time, the first roller 741d of the first tangent thread drive swing arm 741b1 enters the first roller groove 721 of the transmission cam 72, so that the movable component 74 is connected to the transmission cam 72.

[0074] Please see Figure 18C and Figure 18D As shown, when the first roller 741d of the first tangential drive arm 741b1 is located inside the first roller groove 721 of the transmission cam 72, the upper shaft 21 of the sewing drive mechanism 20 will continuously drive the transmission cam 72 of the cutter drive mechanism 70 to rotate clockwise, allowing the first roller 741d to move into the first rear section 721b of the first roller groove 721. In this embodiment, when the first roller 741d moves along the first rear section 721b, the first rear section 721b cooperates with the first roller 741d to allow the tangential drive arm 741 of the movable component 74 to rotate clockwise, so that the second roller 741e of the second tangential drive arm 741b2 enters the second front section 722a of the second roller groove 722 through the second front opening 725 of the second roller groove 722.

[0075] Please see Figure 18EAs shown, during the movement of the second roller 741e of the second tangential drive arm 741b2 along the second front section 722a of the second roller groove 722, the tangential drive arm 741 of the movable component 74 will continue to rotate clockwise. The clockwise rotation of the tangential drive arm 741 will increase the angle between the tangential connecting arm 741c of the tangential drive arm 741 and the tangential swing arm 742 of the movable component 74, causing the tangential threading member 743 of the movable component 74 to move downward away from the transmission cam 72 of the cutter drive mechanism 70. Consequently, the sector gear 732 of the linkage component 73 can rotate clockwise around the linkage shaft 731 of the linkage component 73.

[0076] Please see Figure 18F and Figure 18G As shown, the clockwise oscillating sector gear 732 drives the ring gear 611 of the cutter transmission assembly 61 to rotate counterclockwise. This causes the ring gear 611, via the connecting bevel gear 613, the first cutter transmission rod 612a, the first relay bevel gear 614, the second relay bevel gear 615, the second cutter transmission rod 612b, and the cutter relay gear 616, to drive the movable cutter 621 of the cutter assembly 62 to rotate counterclockwise, allowing the movable cutter 621 to move away from the tangent position C1 (e.g., ...). Figure 18M As shown), this allows the movable blade portion 621b of the movable cutter 621 to gradually move away from the fixed blade portion 622b of the fixed cutter 622.

[0077] Please see Figure 18H and Figure 18I As shown, the upper shaft 21 of the sewing drive mechanism 20 continuously drives the transmission cam 72 of the cutter drive mechanism 70 to rotate clockwise, causing the first roller 741d of the first tangent drive arm 741b1 to move along the first rear section 721b of the first roller groove 721 so that the movable cutter 621 of the cutter assembly 62 can first pass the hanging edge 423b6 of the bearing flange 423b2, and then the movable cutter 621 can pass through the connecting groove 423b3 of the rotary hook bearing ring 423b. When the first roller 741d moves out of the first rear section 721b through the first rear opening 724 of the first roller groove 721, the sector gear 732 of the linkage component 73 will stop oscillating clockwise, and the movable cutter 621 will stop at a position C2 to hook the thread. At the same time, the second roller 741e of the second tangent drive arm 741b2 will be located at the junction between the second front section 722a and the second rear section 722b.

[0078] Please see Figure 18J and Figure 18KAs shown, the transmission cam 72 of the cutter drive mechanism 70 rotates clockwise continuously via the upper shaft 21 of the sewing drive mechanism 20, causing the second roller 741e of the second tangent drive arm 741b2 to move along the second rear section 722b of the second roller groove 722, so that the sector gear 732 of the linkage assembly 73 can swing counterclockwise. The counterclockwise swinging sector gear 732 can drive the ring gear 611 of the cutter transmission assembly 61 to rotate clockwise. Then, the ring gear 611 drives the movable cutter 621 of the cutter assembly 62 to rotate clockwise via the linkage bevel gear 613, the first cutter transmission rod 612a, the first relay bevel gear 614, the second relay bevel gear 615, the second cutter transmission rod 612b, and the cutter relay gear 616, so that the movable cutter 621 can move from the waiting position C2 to the hooking position C3. During the process of reaching the hook position C3, the movable blade 621b of the movable cutter 621 passes through the connecting groove 423b3 between the needle hole 422a of the needle plate 422 and the rotary hook support ring 423b. This causes the hook groove 621b1 of the movable blade 621b to come into contact with a needle thread L1 passing through the needle 32 and a bobbin thread L2 installed on the shuttle housing 424. The hook groove 621b1 then guides the needle thread L1 and the bobbin thread L2 into the guide groove of the movable blade 621b. Inside 621b3, in this embodiment, when the second roller 741e moves along the second rear section 722b, the second rear section 722b cooperates with the second roller 741e to allow the tangential drive swing member 741 of the movable component 74 to rotate counterclockwise, so that the first roller 741d of the first tangential drive swing arm 741b1 enters the first front section 721a of the first roller groove 721 through the first front opening 723 of the first roller groove 721.

[0079] Please see Figure 18L and Figure 18MAs shown, the second roller 741e of the second tangential drive arm 741b2 continues to move along the second rear section 722b of the second roller groove 722, causing the movable blade 621b of the movable cutter 621 to carry the needle thread L1 and the bobbin thread L2 past the thread hanging edge 423b6 of the bearing flange 423b2, so that the thread hanging edge 423b6 can lengthen the bobbin thread L2 by blocking the bottom thread L2. Next, the movable cutter 621, which rotates clockwise, will allow the movable blade 621b to pass through the cutter movement area A2, wherein, when the second roller 741e passes the first When the second rear opening 726 of the second roller groove 722 moves out of the second rear section 722b, the sector gear 732 of the linkage component 73 will stop its counterclockwise oscillation. Consequently, the movable cutter 621 will return to the tangent position C1, allowing the movable blade 621b2 to engage with the fixed blade 622b of the fixed cutter 622 to cut the needle thread L1 and the bobbin thread L2. This ensures that the bobbin thread L2 remaining in the rotary hook 421 retains sufficient length, allowing the inner thread sewing machine 1 to smoothly pull up the bobbin thread L2 during the next sewing operation, thus preventing missed stitches due to insufficient bobbin thread L2 length. Figure 18N As shown, in order to retain a longer length of the bottom thread L2 exposed in the rotary hook 421, the thread-hanging edge 423b6 of the bearing flange 423b2 can protrude from one of the groove sidewalls 423b5 of the connecting groove 423b3 of the rotary hook bearing ring 423b. This allows the thread-hanging edge 423b6 to be positioned in the connecting groove 423b3. When the hook groove 621b1 of the movable cutter 621 carries the needle thread L1 and the bottom thread L2 through the connecting groove 423b3, the bottom thread L2 will contact the thread-hanging edge 423b6 earlier, allowing the thread-hanging edge 423b6 to block the bottom thread L2 earlier. Then, when the movable blade 621b2 cooperates with the fixed blade 622b to cut the needle thread L1 and the bottom thread L2, the bottom thread L2 exposed in the rotary hook 421 will have a longer length.

[0080] Please see Figure 18O and Figure 18PAs shown, when the second roller 741e of the second tangential drive arm 741b2 moves out of the second rear section 722b, the driver 712 of the drive assembly 71 is turned off (the electromagnet is de-energized), causing the telescopic rod 713 of the drive assembly 71 to lose its thrust. Consequently, the return spring 75 of the cutter drive mechanism 70 can push the movable component 74 of the cutter drive mechanism 70 through the return force F, causing the movable component 74 to move away from the active position B2 along the swing arm support shaft 113 of the sewing body 11, allowing the connecting longitudinal section 744b of the tangential push pin 744 to connect. When the connecting longitudinal section 744b touches the end of the support shaft guide rail 113a away from the C-ring 115, the movable component 74 is in the stationary position B1. The tangent thread insert 743 of the movable component 74 will penetrate into the tangent recess 114 of the sewing body 11, so the movable component 74 cannot rotate relative to the swing arm support shaft 113. At the same time, the first roller 741d of the first tangent drive swing arm 741b1 will move out of the first roller groove 721 of the transmission cam 72.

[0081] Please see Figure 19A , Figure 19B and Figure 19C As shown, for the specific application of replacing the fixed cutter 622, firstly, as Figure 19A As shown, the rocker arm body 12 of the machine body 10 is in the middle position of the swing range, so that a part of the fixed cutter 622 of the cutter assembly 62 is covered by the shuttle head cover 124 of the fixed cutter 622, thus the fixed cutter 622 is in a covered state D1, as shown. Figure 19B As shown, the rocker arm body 12 swings forward, and the hook base 423 of the hook body 42 and the needle plate 422 of the hook body 42 are held together by the needle plate retaining mechanism 50 and do not swing forward with the rocker arm body 12, so that the shuttle head cover 124 covers the entire fixed cutter 622, as shown. Figure 19C As shown, the rocker arm body 12 swings backward, so that the entire fixed cutter 622 is aligned with the slot 129 located on the cutter cover 124, and thus the fixed cutter 622 is exposed in an exposed state D2 that is not covered by the cutter cover 124, allowing technicians to directly replace the fixed cutter 622.

[0082] The above description is illustrative only and not restrictive. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope of the technical concept, but all will fall within the protection scope of this utility model.

Claims

1. An inner thread sewing machine, comprising a sewing body, a bearing housing connected to the sewing body, and a rocker arm body capable of swinging relative to the sewing body, wherein the sewing body has a rotatable upper shaft inside and a cutting drive mechanism is mounted thereon, and the rocker arm body has a cutting mechanism inside connected to the cutting drive mechanism, characterized in that, The cutting mechanism includes: One movable cutting blade; A ring gear, rotatably connected to the bearing housing and meshing with the cutter drive mechanism; and Two cutter drive rods are connected to each other, and one of the cutter drive rods is connected to a linkage bevel gear that meshes with the ring gear, while the other cutter drive rod is connected to a cutter relay gear that connects to the movable cutter.

2. The intercom unit according to claim 1, characterized in that, The ring gear is coaxially sleeved on the bearing housing, such that the axis of the ring gear overlaps with the axis of the bearing housing. The ring gear has an outer tooth portion located around the ring gear and an end face tooth portion located on the end face of the ring gear. The outer tooth portion meshes with the cutter drive mechanism, while the end face tooth portion meshes with the connecting bevel gear.

3. The intercom unit according to claim 1, characterized in that, The cutter drive mechanism includes: A transmission cam is connected to the upper shaft and can rotate synchronously with the upper shaft; A linkage component engages with the outer teeth of the ring gear; A movable component is movably connected to a swing arm support shaft and a linkage assembly of the sewing body. The movable component can rotate or move simultaneously relative to both the swing arm support shaft and the linkage assembly. Simultaneously, the movable component is positioned in a stationary position relative to the all-thread recess of the sewing body, preventing rotation of the movable component relative to the swing arm support shaft. A drive assembly is used to move the movable assembly relative to the linkage assembly, so that the movable assembly moves from the stationary position to a movable position separated from the tangent recess, and then the movable assembly is connected to the transmission cam, and the rotating cam can drive the movable assembly to rotate, so that the linkage assembly drives the movable cutter of the cutter mechanism.

4. The intercom unit according to claim 3, characterized in that, The cutter drive mechanism also has a return spring, which generates a reset force acting on the movable component, so that the movable component can move from the movable position to the stationary position by the reset force.

5. The intercom unit according to claim 3, characterized in that, The drive assembly has a swing arm and a driver. The central region of the swing arm is pivotally connected to the sewing body, and the driver can drive a telescopic rod to extend toward one end of the swing arm, so that the other end of the swing arm can push the movable assembly to the movable position.

6. The intercom unit according to claim 3, characterized in that, The movable component has a tangent-driven swing arm, a tangent-swing arm, and a tangent-threading component. The tangent-driven swing arm is movably connected to the sewing body, and one end of the tangent-swing arm is pivotally connected to the tangent-driven swing arm and the other end is movably connected to the linkage component. The tangent-threading component is disposed on the tangent-driven swing arm and movably connected to the tangent-swing arm, and can be threaded into the tangent recess when the movable component is in the stationary position.

7. The intercom unit according to claim 6, characterized in that, The tangential drive swing arm is provided with a first tangential drive swing arm and a second tangential drive swing arm arranged at intervals between the first tangential drive swing arm and the second tangential drive swing arm. The first tangential drive swing arm and the second tangential drive swing arm are respectively equipped with a first roller and a second roller. A first roller groove and a second roller groove are respectively formed on opposite sides of the transmission cam. When the movable component is in the movable position, the first roller groove can accommodate the first roller.

8. The intercom unit according to claim 6, characterized in that, The drive assembly is connected to the outside of the sewing body. The tangent drive swing member, tangent swing rod, and tangent threading member are all disposed inside the sewing body. The movable assembly also has a tangent push pin, which passes through the sewing body such that a portion of the tangent push pin is located inside the sewing body to connect with the tangent drive swing member, while the remaining portion of the tangent push pin is located outside the sewing body adjacent to the drive assembly.

9. The intercom unit according to claim 8, characterized in that, The swing arm support shaft is located inside the sewing body and can be fitted by the tangent drive swing piece. The tangent push pin has a connecting horizontal section that can pass through the inside of the swing arm support shaft to the outside of the sewing body and a connecting vertical section that intersects with the connecting horizontal section. The connecting vertical section can pass through the swing arm support shaft to connect to the tangent drive swing piece.

10. The intercom unit according to claim 9, characterized in that, The swing arm support shaft extends inward to form a support shaft guide rail with a profile larger than the connecting longitudinal section. The connecting longitudinal section can pass through the support shaft guide rail. When the movable component moves relative to the swing arm support shaft to the stationary or movable position, the connecting longitudinal section can approach one end of the support shaft guide rail.

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