Sewing machine thread trimming device with adjustable thread end length

Abstract

The utility model discloses a sewing machine thread trimming device with adjustable thread end length, which relates to the field of sewing machines and comprises a spindle, a concentric first mounting shaft section is arranged on the outer end face of the spindle, a concentric second mounting shaft section is arranged on the outer end face of the first mounting shaft section, and the diameter of the second mounting shaft section is smaller than that of the first mounting shaft section. The first mounting shaft section is rotatably connected with a first driving device, the first driving device is fixedly connected with a main cutter device, the second mounting shaft section is rotatably connected with a second driving device, the second driving device is fixedly connected with an auxiliary cutter device, and the outer end face of the first mounting shaft section is rotatably connected with an intermediate gear which is coaxial with the first mounting shaft section; the intermediate gear is located between the first driving device and the second driving device, the intermediate gear is in transmission connection with the first driving device and the second driving device at the same time, the first driving device, the intermediate gear and the second driving device form a planetary gear structure, the structure is simple and reliable, and the length of a thread end can be conveniently adjusted.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing machine field, concretely relates to a sewing machine thread trimming device of thread length adjustable. BACKGROUND

[0002] The thread trimming function of the current sewing machine is usually completed by a thread trimmer, and the existing thread trimmer is mostly composed of a fixed knife and a moving knife. When the sewing machine finishes sewing, the moving knife moves forward to form a shearing action with the fixed knife to cut the face thread and the bottom thread at the same time. The existing thread trimmer has the problem of excessively long thread ends on the cloth after thread trimming, and manual thread trimming is still needed in the later stage.

[0003] The patent document with the application number CN201720696677.2 discloses a double-moving-knife thread trimming mechanism of a sewing machine, which includes a main moving knife group and an auxiliary moving knife group. The main moving knife group includes a main moving knife holder sleeved on a lower shaft front sleeve. The outer edge of the main moving knife holder is fixedly connected with a main moving knife. The main moving knife has a main moving knife thread trimming edge. The connecting lug plate of the main moving knife holder is connected with a connecting rod mechanism. The auxiliary moving knife group includes an auxiliary moving knife holder sleeved on the lower shaft front sleeve. The outer edge of the auxiliary moving knife holder is fixedly connected with an auxiliary moving knife. The auxiliary moving knife has an auxiliary moving knife thread trimming edge. The auxiliary moving knife thread trimming edge of the auxiliary moving knife corresponds to the main moving knife thread trimming edge of the main moving knife. The connecting lug plate of the auxiliary moving knife holder is connected with the connecting rod mechanism, which has the advantages of convenient installation and maintenance, high reliability, and short thread ends after thread trimming, without the need for manual thread trimming to reduce costs. However, in the actual production process, the length of the thread end is not the shorter the better, and excessively short thread ends will increase the risk of thread opening. The length of the thread end needs to be adjusted according to the actual situation. The above-mentioned thread trimming mechanism needs to use multiple connecting rod mechanisms for synchronous reverse driving, and the stroke distance between the main moving knife and the auxiliary moving knife is difficult to adjust, which not only leads to a complex structure but also results in the inability to effectively adjust the length of the thread end, which is very inconvenient. UTILITY MODEL CONTENTS

[0004] To solve the problems in the above background art, the utility model provides a sewing machine thread trimming device with adjustable thread end length, which is simple and reliable in structure and can conveniently adjust the length of the thread end.

[0005] To achieve the above-mentioned purpose, the specific technical scheme of the utility model is as follows:

[0006] The sewing machine thread trimming device with adjustable thread length comprises a main shaft, a concentric first mounting shaft section is arranged on the outer end surface of the main shaft, a concentric second mounting shaft section is arranged on the outer end surface of the first mounting shaft section, the diameter of the second mounting shaft section is smaller than that of the first mounting shaft section, a first driving device is rotatably connected to the first mounting shaft section, a main cutter device is fixedly connected to the first driving device, a second driving device is rotatably connected to the second mounting shaft section, and a secondary cutter device is fixedly connected to the second driving device.

[0007] As a further arrangement of the above scheme, the first driving device comprises a first rotating ring rotatably connected to the first mounting shaft section, a connecting plate is fixedly connected to the first rotating ring, an arc-shaped notch is formed in the outer wall of the first rotating ring, the arc surface of the arc-shaped notch is arranged in parallel with the inner wall of the first rotating ring, and a first gear tooth is formed in the arc surface of the arc-shaped notch and engaged with the intermediate gear.

[0008] As a further arrangement of the above scheme, the main cutter device comprises a main cutter mounting table fixedly mounted on the outer end surface of the first rotating ring, a main cutter handle is detachably mounted on the main cutter mounting table, and a main cutter is fixedly connected to the main cutter handle, wherein the main cutter is an arc-shaped blade with a same center axis as the first rotating ring, a cutting groove is formed in the main cutter, and the sewing thread is pushed into the cutting groove by the thread splitter before being cut.

[0009] As a further arrangement of the above scheme, the second driving device comprises a second rotating ring rotatably connected to the second mounting shaft section, an arc-shaped inner ring with a same center axis as the second rotating ring is arranged on the outer end surface of the second rotating ring, a second gear tooth is formed in the inner wall of the arc-shaped inner ring and engaged with the intermediate gear.

[0010] As a further arrangement of the above scheme, the secondary cutter device comprises a secondary cutter mounting table fixedly mounted on the arc-shaped inner ring, a secondary cutter handle is detachably mounted on the secondary cutter mounting table, and a secondary cutter is fixedly connected to the secondary cutter handle, wherein the secondary cutter is an arc-shaped blade with a same center axis as the second rotating ring, the inner wall surface of the secondary cutter is located in the same cylindrical surface as the outer wall surface of the main cutter, and the secondary cutter is arranged corresponding to the cutting groove.

[0011] The utility model has the advantages of:

[0012] The first driving device is driven to reciprocate by a connecting rod, the first driving device drives the second driving device to synchronously rotate reversely through an intermediate gear, the main cutter device and the auxiliary cutter device are synchronously and oppositely moved, the slot and the auxiliary cutter are cross-laminated and matched to cut the suture, the driving structure is compact, simple and reliable, and is convenient to maintain.

[0013] When the length of the thread end needs to be adjusted, the first driving device is temporarily fixed, the second driving device is rotated to drive the auxiliary cutter device to move in a circle, the stroke distance between the main cutter device and the auxiliary cutter device is changed, thereby the time required for the slot and the auxiliary cutter to be cross-laminated and matched is changed, the length of the thread end is adjusted, and no tool is needed. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic view of the appearance of the utility model;

[0015] Figure 2 is a side view of the utility model;

[0016] Figure 3 is a schematic view of the position of the main shaft and the intermediate gear of the utility model;

[0017] Figure 4 is an assembly schematic view of the first driving device and the main cutter device of the utility model;

[0018] Figure 5 is an assembly schematic view of the second driving device and the auxiliary cutter device of the utility model.

[0019] 1, main shaft; 2, first driving device; 3, main cutter device; 4, second driving device; 5, auxiliary cutter device; 6, intermediate gear; 101, first mounting shaft section; 102, second mounting shaft section; 201, first rotating ring; 202, connecting plate; 203, arc-shaped notch; 204, first gear tooth; 301, main cutter mounting table; 302, main cutter handle; 303, main cutter; 304, slot; 401, second rotating ring; 402, arc-shaped inner ring; 403, second gear tooth; 501, auxiliary cutter mounting table; 502, auxiliary cutter handle; 503, auxiliary cutter. DETAILED DESCRIPTION

[0020] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0021] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Figures 1-5 The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] As shown in Figure 1 , Figure 3 , a thread length adjustable sewing machine thread trimming device, the outer end surface of the main shaft 1 is provided with a concentric first mounting shaft section 101, the outer end surface of the first mounting shaft section 101 is provided with a concentric second mounting shaft section 102, the diameter of the second mounting shaft section 102 is smaller than the diameter of the first mounting shaft section 101, the first mounting shaft section 101 is rotatably connected with a first driving device 2, the first driving device 2 is fixedly connected with a main knife device 3, the second mounting shaft section 102 is rotatably connected with a second driving device 4, the second driving device 4 is fixedly connected with a secondary knife device 5, the outer end surface of the first mounting shaft section 101 is rotatably connected with a concentric intermediate gear 6, the intermediate gear 6 is located between the first driving device 2 and the second driving device 4, and the intermediate gear 6 is in transmission connection with the first driving device 2 and the second driving device 4.

[0023] As shown in Figure 4 , the first driving device 2 includes a first rotating ring 201, the first rotating ring 201 is rotatably connected on the first mounting shaft section 101, the first rotating ring 201 is fixedly connected with a connecting plate 202, the connecting plate 202 is connected with a connecting rod mechanism (not marked in the figure), the connecting rod mechanism can drive the first rotating ring 201 to reciprocate within a certain angle range, an arc-shaped notch 203 is opened on the outer wall of the first rotating ring 201, the arc surface of the arc-shaped notch 203 is parallelly arranged with the inner wall of the first rotating ring 201, a first gear tooth 204 is opened on the arc surface of the arc-shaped notch 203, and the first gear tooth 204 is in meshing connection with the intermediate gear 6.

[0024] The main knife device 3 includes a main knife mounting table 301, the main knife mounting table 301 is fixedly mounted on the outer end surface of the first rotating ring 201, a main knife handle 302 is detachably mounted on the main knife mounting table 301, a main knife 303 is fixedly connected on the main knife handle 302, the main knife 303 is an arc-shaped blade with a concentric axis with the first rotating ring 201, a cutting groove 304 is opened on the main knife 303, before the thread trimming action, the sewing thread will be pushed into the cutting groove 304 by the thread separating piece

[0025] As shown in Figure 5 , the second driving device 4 includes a second rotating ring 401, the second rotating ring 401 is rotatably connected on the second mounting shaft section 102, an arc-shaped inner ring 402 with a concentric axis with the second rotating ring 401 is arranged on the outer end surface of the second rotating ring 401, a second gear tooth 403 is opened on the inner wall of the arc-shaped inner ring 402, and the second gear tooth 403 is in meshing connection with the intermediate gear 6.

[0026] The vice cutter device 5 comprises a vice cutter mounting table 501 fixedly mounted on the arc-shaped inner ring 402, and a vice cutter handle 502 detachably mounted on the vice cutter mounting table 501, and a vice cutter 503 fixedly mounted on the vice cutter handle 502.

[0027] The working process of the utility model is as follows: taking the attached Figure 2 For example, the stroke distance between the main cutter device 3 and the vice cutter device 5 is the largest before the device performs the thread cutting action, and the thread enters into the cutting groove 304 under the driving of the thread separating piece, when cutting the thread, the first rotating ring 201 is driven to rotate clockwise by the connecting rod mechanism (not shown in the figure), the first rotating ring 201 drives the intermediate gear 6 to rotate counterclockwise through the first gear teeth 204, the intermediate gear 6 drives the second rotating ring 401 to rotate counterclockwise through the second gear teeth 403, the main cutter device 3 moves in a clockwise circle, the vice cutter device 5 moves in a counterclockwise circle, the vice cutter 503 and the cutting groove 304 approach each other, the cutting groove 304 drives the thread to elongate and deflect to the vice cutter 503, the cutting groove 304 and the vice cutter 503 are in staggered fit after the thread is cut off, and the thread is cut off, the main cutter device 3 and the vice cutter device 5 are reset to the previous position.

[0028] When the position of the cutting groove 304 and the vice cutter 503 in staggered fit is the highest point, the length of the thread end is the shortest, and the farther the position of the cutting groove 304 and the vice cutter 503 in staggered fit is from the highest point, the longer the length of the thread end is.

[0029] When the length of the thread end needs to be adjusted, the first rotating ring 201 is temporarily fixed, the second rotating ring 401 is rotated, the vice cutter device 5 moves in a circle, the stroke distance between the main cutter device 3 and the vice cutter device 5 is changed, the time required for the cutting groove 304 and the vice cutter 503 in staggered fit is changed, the distance between the position of the cutting groove 304 and the vice cutter 503 in staggered fit and the highest point is changed, and the length of the thread end is adjusted, and no tool is needed during the adjustment, and the operation is simple and fast.

[0030] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, and it is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims instead of the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model.

[0031] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly encompassed by the specification.

Claims

1. A thread trimming device of a sewing machine with adjustable thread length, comprising a spindle, an outer end surface of the spindle is provided with a concentric first mounting shaft section, an outer end surface of the first mounting shaft section is provided with a concentric second mounting shaft section, the diameter of the second mounting shaft section is smaller than the diameter of the first mounting shaft section, characterized in that, The first installation shaft section is rotationally connected with a first driving device, the first driving device is fixedly connected with a main cutter device, the second installation shaft section is rotationally connected with a second driving device, the second driving device is fixedly connected with a secondary cutter device, the outer end surface of the first installation shaft section is rotationally connected with a same-center-axis intermediate gear, the intermediate gear is located between the first driving device and the second driving device, and the intermediate gear is in transmission connection with the first driving device and the second driving device.

2. The thread trimmer of claim 1, wherein, The first driving device comprises a first rotating ring, the first rotating ring is rotationally connected with the first installation shaft section, the first rotating ring is fixedly connected with a connecting plate, an arc-shaped notch is formed in the outer wall of the first rotating ring, the arc surface of the arc-shaped notch is parallel to the inner wall of the first rotating ring, and a first gear tooth is formed in the arc surface of the arc-shaped notch.

3. The thread trimmer of claim 2, wherein the thread trimmer is configured to trim the thread to a length of 0.5 mm to 2 mm. The main cutter device comprises a main cutter mounting table, the main cutter mounting table is fixedly installed on the outer end surface of the first rotating ring, the main cutter mounting table is detachably installed with a main cutter handle, and the main cutter handle is fixedly connected with a main cutter.

4. The thread trimmer of claim 3, wherein the thread trimmer is configured to trim the thread to a length of 0.5 mm to 2 mm. The second driving device comprises a second rotating ring, the second rotating ring is rotationally connected with the second installation shaft section, and an arc-shaped inner ring that is of a same-center-axis with the second rotating ring is arranged on the outer end surface of the second rotating ring.

5. The thread trimmer of claim 4, wherein the thread trimmer is configured to trim the thread to a length of 0.5 mm to 2 mm. The secondary cutter device comprises a secondary cutter mounting table, the secondary cutter mounting table is fixedly installed on the arc-shaped inner ring, the secondary cutter mounting table is detachably installed with a secondary cutter handle, and the secondary cutter handle is fixedly installed with a secondary cutter. The secondary cutter device comprises a secondary cutter mounting table, the secondary cutter mounting table is fixedly installed on the arc-shaped inner ring, the secondary cutter mounting table is detachably installed with a secondary cutter handle, and the secondary cutter handle is fixedly installed with a secondary cutter.

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