Manual clutch installation protection structure of sewing machine head

Abstract

The utility model provides a manual clutch installation protection structure of a sewing machine head, and belongs to the technical field of sewing machines. The manual clutch device solves the problem of how to quickly and conveniently realize manual clutch. According to the manual clutch installation protection structure of the sewing machine head, the sewing machine comprises a base, and the manual clutch installation protection structure of the sewing machine head comprises a driving shaft and a driven shaft which are rotationally connected into the base and are in transmission connection through a clutch. The clutch comprises an adjusting sleeve which is positioned on the driven shaft and enables the driving shaft and the driven shaft to conduct power transmission when the adjusting sleeve rotates, an inserting hole is formed in the outer side wall of the adjusting sleeve, a pressing rod is slidably connected into the base in the vertical direction, and a spring used for limiting the pressing rod from moving downwards is arranged in the base. The lower end of the pressing rod is opposite to the inserting hole in position, and after the pressing rod is extruded to move downwards, the lower end of the pressing rod can be inserted into the inserting hole. By means of the manual clutch installation protection structure of the sewing machine head, manual clutch can be rapidly and conveniently achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a manual clutch installation protection structure for a sewing machine head. Background Technique

[0002] In the prior art, the work of a sewing machine is completed by the cooperation of a sewing needle, a rotary hook and a feed dog. Specifically, the sewing needle mounting rod driven by a motor drives the sewing needle to reciprocate up and down, so that the tip of the sewing needle pulls a thread loop from one side of the sewing material to the other side with the surface thread. At the same time, the rotary hook installed in the base and rotating hooks the thread loop through the hook tip, then connects it with the bottom thread or another thread loop, and under the pushing action of the feed dog, the sewing material is continuously pushed, so that a stitch will be formed on the sewing material, and then the interweaving or sewing of one or more layers of sewing materials is realized.

[0003] However, in the actual operation process, due to the influence of various factors, the rotary hook will get stuck with the thread, which is likely to cause the displacement of the rotary hook, and then lead to the situation of skipped stitches during the sewing process. Therefore, it is necessary to readjust the rotary hook in time. But before performing this operation, it is necessary to disconnect the transmission of the rotary hook first. For example, a safety clutch device used in a sewing machine thread hooking mechanism disclosed in Chinese Patent (Authorization Publication No.: CN214938337U) includes a rotary hook, a lower shaft and a safety clutch mechanism. The lower shaft is divided into a front section and a rear section of the lower shaft. The left end of the front section of the lower shaft is fixedly connected to the rotary hook, and the front section and the rear section of the lower shaft are connected into one body through the safety clutch mechanism.

[0004] It is recorded in paragraphs 0021 and 0022 of the description of the comparative document that: the rotary hook 1 is fixed together by the front section 2 of the lower shaft and the adjusting sleeve 4 to form a group of integral bodies A, and the rear section 3 of the lower shaft and the housing 5 are fixed together to form an integral body B. The integral body A is adjusted by the adjusting nut 8 to compress the butterfly spring 7, and the butterfly spring 7 squeezes the flat washer 14, so that the steel ball 6 is fixed in the hemispherical placement groove 10 of the housing 5 through the cylindrical hole 9 (the three groups of cylindrical holes 9 and the three groups of hemispherical placement grooves 10 have a one-to-one correspondence, and if the rear section 3 of the lower shaft is taken as the reference circle center, the three groups of cylindrical holes 9 and the three groups of hemispherical placement grooves 10 are located at circumferences of different diameters. If reset occurs on the same circumference, one group of steel balls 6 will enter the hemispherical placement groove 10 first, and cannot play a correct reset role, so the three steel balls 6 must enter at the same time. When the lower shaft rear section 3 starts to rotate during sewing, the steel ball 6 drives the whole A to rotate, thereby realizing the thread hooking operation; when the thread is stuck, the whole A is blocked and does not rotate, but the whole B continues to rotate. Under the action of the force, the steel ball 6 squeezes the flat pad 14 to compress the butterfly spring 7. The steel ball 6 is driven by the adjusting sleeve 4 to disengage from the hemispherical placement groove 10, thereby realizing the separation of the whole A and the whole B. After the safety clutch device is separated, the sewing machine cannot work normally. At this time, the operator clears the thread stuck on the rotary hook 1 in advance, and then clamps the whole A with a tool, rotates the lower shaft rear section 3 clockwise (the sewing machine works counterclockwise), and the three groups of steel balls 6 fall into the hemispherical placement groove 10 at the same time, so that the device returns to its initial state.

[0005] In simple terms, the transmission of the front section and the rear section of the lower shaft is achieved through the engagement of three steel balls 6 and three hemispherical placement grooves, but this situation is often a forced protection mechanism performed in the worst case. In actual use, there may be a slight displacement of the rotary shuttle, but the displacement is not enough to cause the three steel balls to escape from the three hemispherical placement grooves. At this time, the user needs to perform manual clutch before disassembling the machine for repair, that is, while keeping the rear section of the lower shaft fixed, forcefully rotate the front section of the lower shaft so that the three steel balls escape from the three hemispherical placement grooves, or remove the first screw and the adjusting nut so that the pressure of the three steel balls on the three hemispherical placement grooves is released through the disc spring. However, the former solution requires a lot of force to achieve clutch, which is difficult to achieve by manpower. Although the latter solution can avoid the defects that cannot be completed by manpower, the internal space of the sewing machine itself is narrow, which is extremely inconvenient for disassembly operations. Summary of the invention

[0006] The purpose of the utility model is to solve the above problems in the existing technology and propose a manual clutch installation protection structure for a sewing machine head. The technical problem to be solved by the utility model is: how to quickly and conveniently realize manual clutch.

[0007] The object of the present utility model can be achieved by the following technical solutions: A manual clutch installation protection structure for a sewing machine head. The sewing machine includes a base. The manual clutch installation protection structure of the sewing machine head includes a driving shaft and a driven shaft that are rotatably connected in the base and are drivingly connected through a clutch. The clutch includes an adjusting sleeve positioned on the driven shaft and enabling power transmission between the driving shaft and the driven shaft during rotation. A jack is provided on the outer side wall of the adjusting sleeve. A pressing rod is slidably connected vertically in the base. A spring for restricting the downward movement of the pressing rod is provided in the base. When the adjusting sleeve rotates to make the orifice of the jack face upward, the lower end of the pressing rod is opposite to the position of the jack, and when the pressing rod is squeezed and moves downward, the lower end of the pressing rod can be inserted into the jack.

[0008] This solution mainly uses a manually operated pressing rod to insert the pressing rod into the jack on the adjusting sleeve. The presence of the pressing rod circumferentially limits the adjusting sleeve, thereby forcibly disengaging the clutch and achieving the purpose of disconnecting the transmission between the driving shaft and the driven shaft. It should be noted that the clutch mentioned in this case is a prior art, and its specific structure and working principle can be referred to in the comparative document CN214938337U. The main innovation of this case compared to the comparative document is that through the cooperation of the pressing rod slidably connected in the base and the jack provided on the outer wall of the clutch adjusting sleeve, when there is a fault in the rotating shuttle of the sewing machine but the fault is not sufficient to cause the clutch to control the disconnection between the driving shaft and the driven shaft, the user can manually squeeze the upper end of the pressing rod downward, causing the entire pressing rod to slide downward. The jack provided on the outer wall of the adjusting sleeve that rotates with the driven shaft will be aligned with the lower end of the pressing rod for a moment during the rotation of the adjusting sleeve. The user only needs to ensure that the pressing rod always has a downward acting force, and it can be inserted into the jack at the moment when the hole positions are aligned. Thus, the driven shaft is circumferentially limited by the cooperation of the pressing rod and the adjusting sleeve. In this state, since the adjusting sleeve stops rotating, the clutch directly disconnects the transmission between the driving shaft and the driven shaft, thereby achieving fast and convenient manual clutch. It is worth mentioning that through the setting of the spring, it can ensure that after the pressure acting on the pressing rod disappears, the elastic force of the spring can drive it to slide upward and reset to avoid the presence of the pressing rod causing transmission blockage to the circumferential limit of the driven shaft after subsequent adjustment.

[0009] In the above-mentioned manual clutch installation protection structure of the sewing machine head, a guiding hole is vertically formed in the base, the pressing rod is slidably connected in the guiding hole, an installation groove is formed in the base around the upper end of the guiding hole, the upper end of the pressing rod has a limiting portion in the circumferential direction, the spring is sleeved outside the pressing rod and located in the installation groove, and one end of the spring abuts against the limiting portion, and the other end abuts against the bottom wall of the installation groove. Through the arrangement of the guiding hole, the sliding direction of the pressing rod is limited and guided to prevent the situation of its position deviation, and through the spring abutting and cooperating with the limiting portion and the bottom wall of the installation groove, an elastic force for the pressing rod to move upward is given, ensuring that after the user presses the pressing rod, the pressing rod can quickly move back to its original position.

[0010] In the above-mentioned manual clutch installation protection structure of the sewing machine head, the notch of the installation groove is flared. This ensures the convenience of installing the pressing rod.

[0011] In the above-mentioned manual clutch installation protection structure of the sewing machine head, a limiting ring is radially arranged on the outer wall of the pressing rod near the lower end, and the upper side surface of the limiting ring abuts against the inner wall of the base. Thus, the limiting ring and the spring cooperate to limit the pressing rod in the vertical direction and prevent the pressing rod from coming out of the guiding hole.

[0012] In the above-mentioned manual clutch installation protection structure of the sewing machine head, an annular groove is circumferentially formed on the outer wall of the pressing rod near the lower end, and the limiting ring is embedded and limited in the annular groove. This ensures the firm installation of the limiting ring.

[0013] Compared with the prior art, the manual clutch installation protection structure of the sewing machine head has the following advantages:

[0014] By adopting the method of manually pressing the pressing rod, the pressing rod is inserted into the jack on the adjusting sleeve. Due to the existence of the pressing rod, the adjusting sleeve is circumferentially limited, so as to achieve the disconnection of the transmission between the driving shaft and the driven shaft manually, and achieve the purpose of quickly and conveniently realizing the manual clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the sewing machine.

[0016] Figure 2 is a rear view of the sewing machine.

[0017] Figure 3 is Figure 2 a sectional view taken along the direction A-A and its partial enlarged view.

[0018] Figure 4 is a schematic structural diagram of the manual clutch installation protection structure of the sewing machine head of the present invention.

[0019] Figure 5 Is Figure 4 The partial enlarged view of part A in it.

[0020] Figure 6 Is the cross-sectional view of the base cut along the width direction.

[0021] Figure 7 Is the structural schematic diagram of the pressing rod.

[0022] In the figure, 1 is the base; 11 is the spring; 12 is the guide hole; 13 is the installation groove; 14 is the protruding part; 2 is the clutch; 21 is the adjusting sleeve; 211 is the jack; 3 is the driving shaft; 4 is the driven shaft; 5 is the pressing rod; 51 is the limiting part; 52 is the limiting ring; 53 is the annular groove. Specific embodiments

[0023] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0024] Such as Figures 1-7As shown, in the manual clutch installation protection structure of the sewing machine head, the sewing machine includes a base 1, and the manual clutch installation protection structure of the head includes a driving shaft 3 and a driven shaft 4 which are rotatably connected in the base 1 and connected through a clutch 2. The driving shaft 3 is driven by a motor to rotate through a gear set, and the output end of the driven shaft 4 is connected to a rotary hook. The clutch 2 is a prior art. Its structure and working principle can be found in paragraphs 0021 and 0022 of the CN214938337U specification. It includes an adjusting sleeve 21, an outer shell, an end cover and a plurality of disc springs, wherein the adjusting sleeve 21 is sleeved on the outside of the driven shaft 4 and is locked by tightening with screws, the outer shell is sleeved on the outside of the driving shaft 3 and is locked by tightening with screws, and three placement grooves are arranged on the inner bottom wall of the outer shell at intervals along the circumferential direction, and the three placement grooves are radially staggered relative to the inner bottom wall of the outer shell, and a plurality of disc springs and end covers are sleeved on the outside of the driven rod 4, and through the screw connection between the end cover and the outer shell, the end cover presses the disc spring to form a force that pushes the adjusting sleeve 21 toward the outer shell. The force pushed by the inner bottom wall causes three steel balls to be rollingly connected to one end of the adjusting sleeve 21 facing the inner bottom wall of the shell. The three steel balls are arranged at intervals along the circumference of the adjusting sleeve 21, and the three steel balls are arranged in a radially staggered manner relative to the adjusting sleeve 21, so that the three steel balls correspond to the three placement grooves one by one. The advantage of this arrangement is that when the clutch disconnects the transmission to the driving shaft 3 and the driven shaft 4, the three steel balls are respectively out of the three placement grooves. When the transmission needs to be restored, the user only needs to confirm To ensure that the driven shaft 4 is in a stationary state, the driving shaft 3 is driven by the motor to rotate 360 ​​degrees to ensure that the driving shaft 3 is correctly reset. In addition, a socket 211 is provided on the outer wall of the adjusting sleeve 21 facing the driven shaft 4, and the base 1 has a protrusion 14 arranged vertically and located directly above the adjusting sleeve 21. A guide hole 12 is vertically provided in the protrusion 14 (when the opening of the socket 211 faces upward) and is located directly above the socket 211. A pressing rod 5 is installed in the guide hole 12 by means of a sliding connection.

[0025] like Figure 2 , Figure 3 , Figure 4 as well as Figure 7 As shown, a mounting groove 13 arranged around the guide hole 12 is opened on the base 1 at the upper end of the guide hole 12, and the groove of the mounting groove 13 is expanded, and the upper end of the pressing rod 5 has a disc-shaped limiting portion 51, the pressing rod 5 is penetrated into the guide hole 12 and the circumferential outer wall is in contact with the circumferential inner wall of the guide hole 12, and the lower end of the pressing rod 5 has a plug-in portion extending out of the lower end of the guide hole 12, and a spring 11 is sleeved on the pressing rod 5, the upper end of the spring 11 is tightly against the limiting portion 51, and the lower end is tightly against the bottom wall of the mounting groove 13, and an annular groove 53 is opened on the outer side wall near the lower end of the pressing rod 5 along the circumferential direction, and a limiting ring 52 is clamped in the annular groove 53, and the limiting ring 52 is specifically arranged horizontally, and when the spring 11 is not in a compressed state, one side of the limiting ring 52 is tightly against the downward end face of the protrusion 14.

[0026] The manual clutch installation protection structure of this sewing machine head aims to control the operation of the clutch 2 through manual control, so as to disconnect the transmission between the driving shaft 3 and the driven shaft 4. When in use, the user can squeeze the pressing rod 5 downward when the driven shaft 4 is rotating slowly, so that the insertion part at the lower end of the pressing rod 5 is inserted into the jack 211 on the adjusting sleeve 21 when they are aligned. Through the limitation of the pressing rod 5 by the wall of the guiding hole 12, the adjusting sleeve 21 and the driven shaft 4 are limited in the circumferential direction. That is to say, the rotation of the driven shaft 4 is restricted, while the driving shaft 3 driven by the motor through the gear still rotates. Combining with the structure disclosed in the comparative document CN214938337U, it can be seen that at this time, the steel balls arranged on the adjusting sleeve 21 are disengaged from the placement groove opened on the inner wall of the clutch 2 housing under the action of the torsional force. Thus, the operation of the clutch 2 is realized to disconnect the transmission between the driving shaft 3 and the driven shaft 4, and the clutch 2 is quickly and conveniently disengaged and engaged through manual operation by the user. It should be noted that when the user releases the pressing rod 5 after completing this operation, the spring 11 can push the pressing rod 5 upward by its elastic force, thereby realizing the automatic reset of the pressing rod 5.

[0027] After completing the debugging of the rotary hook, the user can manually squeeze the pressing rod 5 downward again, so that the insertion part of the pressing rod 5 is inserted into the jack 211 of the adjusting sleeve 21 again, so as to keep the driven shaft 4 and the adjusting sleeve 21 in position. Then start the motor to drive the driving shaft 3 to drive the outer shell of the clutch 2 to rotate slowly, so that the steel balls on the adjusting sleeve 21 are reinserted into the placement groove opened on the inner wall of the housing, and the transmission connection between the driving shaft 3 and the driven shaft 4 can be re-established to realize the normal operation of the rotary hook.

[0028] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0029] Although terms such as base 1, spring 11, guiding hole 12, installation groove 13, clutch 2, adjusting sleeve 21, jack 211, driving shaft 3, driven shaft 4, pressing rod 5, limiting part 51, limiting ring 52, annular groove 53, etc. are used more in this article, the possibility of using other terms is not excluded. Using these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A manual clutch installation and protection structure for a sewing machine head, the sewing machine comprising a base (1), the manual clutch installation and protection structure for the sewing machine head comprising a driving shaft (3) and a driven shaft (4) rotatably connected in the base (1) and connected by a clutch (2), the clutch (2) comprising an adjustment sleeve (21) positioned on the driven shaft (4) and causing the driving shaft (3) and the driven shaft (4) to transmit power when rotating, characterized in that: The outer wall of the adjustment sleeve (21) is provided with an insertion hole (211), and a pressing rod (5) is vertically slidably connected to the base (1). A spring (11) is provided in the base (1) for limiting the downward movement of the pressing rod (5). When the adjustment sleeve (21) is rotated so that the opening of the insertion hole (211) faces upward, the lower end of the pressing rod (5) is opposite to the insertion hole (211), and when the pressing rod (5) is squeezed and moved downward, the lower end of the pressing rod (5) can be inserted into the insertion hole (211).

2. The manual clutch installation protection structure of the sewing machine head according to claim 1, characterized in that: A guide hole (12) is vertically provided in the base (1), the pressing rod (5) is slidably connected in the guide hole (12), a mounting groove (13) is provided on the base (1) and is arranged around the upper end of the guide hole (12), the upper end of the pressing rod (5) has a limiting portion (51) along the circumferential direction, the spring (11) is sleeved outside the pressing rod (5) and is located in the mounting groove (13), and one end of the spring (11) is tightly pressed against the limiting portion (51), and the other end is tightly pressed against the bottom wall of the mounting groove (13).

3. The manual clutch installation protection structure of the sewing machine head according to claim 2, characterized in that: The slot opening of the installation slot (13) is in a flared shape.

4. The manual clutch installation protection structure of the sewing machine head according to any one of claims 1 to 3, characterized in that: A limiting ring (52) is radially provided on the outer wall of the pressing rod (5) close to the lower end, and the upper side surface of the limiting ring (52) abuts against the inner wall of the base (1).

5. The manual clutch installation protection structure of the sewing machine head according to claim 4, characterized in that: An annular groove (53) is provided on the outer wall of the pressing rod (5) near the lower end in the circumferential direction, and the limiting ring (52) is embedded and limited in the annular groove (53).

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