Embroidery machine bottom thread cutting device convenient to maintain and embroidery machine

Abstract

The utility model discloses an embroidery machine bottom thread cutting device convenient to maintain and an embroidery machine, the bottom thread cutting device comprises two scissor components which are arranged side by side along the transverse direction, each scissor component comprises a fixed cutter and a movable cutter which is matched with the fixed cutter through rotation to cut threads, and a connecting rod mechanism is connected between the two movable cutters corresponding to the two scissor components. Wherein the first moving cutter is driven to rotate and drives the second moving cutter to rotate synchronously through the connecting rod mechanism. Compared with the prior art that synchronous rotation is achieved between the two movable cutters through meshing of a gear and a rack, the requirement of the connecting rod mechanism for connecting rod materials and machining precision is not high, maintenance is basically not needed, and therefore the machining cost can be remarkably reduced, and the maintenance cost is also saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of embroidery machines, and particularly relates to an embroidery machine. Background Art

[0002] In the existing double-needle embroidery machine, there is a frame, and several machine heads are installed on the cross beam of the frame. Below the machine head, there is an embroidery frame. As Figure 1 shown, several shuttle box assemblies are arranged side by side in the horizontal direction. The shuttle box assembly is provided with a shuttle box body 300 and a rotary shuttle assembly 301. A bottom thread cutting device 3 is provided on the front side of the shuttle box body 300 for cutting the bottom thread. The bottom thread cutting device 3 is provided with a scissor assembly 35. Among them, for the bottom thread cutting device, several scissor assemblies are arranged side by side in the horizontal direction. A thread cutting drive shaft 31 is provided on the front side of the shuttle box body. The thread cutting drive shaft 31 extends in the horizontal direction and moves linearly in the horizontal direction. The scissor assembly 35 includes a fixed knife 351 and a moving knife 352 that cooperates with the fixed knife to cut the thread. A thread cutting link assembly 32 is provided between the thread cutting drive shaft 31 and the moving knife 352, and each scissor assembly 35 is correspondingly provided with a thread cutting link assembly 32. In this way, one thread cutting drive shaft can correspondingly drive all scissor assemblies through several thread cutting link assemblies.

[0003] The area of the embroidery frame is relatively large and it is required to achieve translation in the X direction and the Y direction. The embroidery frame includes a front part provided on the front side of the shuttle box, a rear part provided on the rear side of the shuttle box body, and several intermediate connectors connecting the front part and the rear part. The intermediate connectors pass through the gaps between adjacent two shuttle box assemblies. Of course, not all the gaps between adjacent two shuttle box assemblies are passed through by the intermediate connectors.

[0004] Due to the increasing number of machine heads and the decreasing distance between the machine heads, the space between adjacent two shuttle box assemblies is extremely limited. If the intermediate connectors are provided, the arrangement of the thread cutting link assembly closest to the intermediate connectors will be restricted by the space, which affects the further reduction of the distance between the machine heads.

[0005] In order to further reduce the distance between the machine heads, the applicant has developed a bottom thread cutting device. Refer to the Chinese utility model patent with the authorization announcement number CN220485997U, which includes a thread cutting drive shaft, a thread cutting link assembly, and a pair of scissors assemblies. The thread cutting drive shaft extends horizontally and moves linearly in the horizontal direction. A plurality of scissors assemblies are arranged side by side in the horizontal direction. Each scissors assembly includes a fixed knife and a moving knife that cooperates with the fixed knife to cut the thread. Among at least one pair of adjacent scissors assemblies, each of the two moving knives is connected to a gear, and the two gears mesh with the same rack. One of the gears is connected to a gear drive shaft, which extends vertically and the lower end is connected to the thread cutting drive shaft through the thread cutting link assembly. The other gear is provided with a gear shaft and rotates around the gear shaft. Since one scissors assembly arranged on the side close to the intermediate connecting member does not need to be provided with a thread cutting link assembly and a gear drive shaft, even if the distance between the machine heads is reduced, it will not interfere with the intermediate connecting member, and at the same time, it will not affect the normal thread cutting function. The synchronous rotation between the two moving knives is realized through the meshing of the gear and the rack. After actual use for a period of time, it is found that since the processing cost of the gear and the rack is relatively high, and dust and thread ends generated during the thread cutting process are likely to enter between the gear and the rack, the maintenance cost is relatively high. Summary of the Utility Model

[0006] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present utility model is to provide a bottom thread cutting device for an embroidery machine and an embroidery machine that are convenient for maintenance, and solve the problem that the synchronous rotation between the two moving knives in the prior art is realized through the meshing of the gear and the rack, resulting in relatively high processing costs and maintenance costs.

[0007] To solve the above technical problems, the present utility model adopts the following technical solutions:

[0008] First, a bottom thread cutting device for an embroidery machine is provided, which includes two scissors assemblies arranged side by side in the horizontal direction. Each scissors assembly includes a fixed knife and a moving knife that cooperates with the fixed knife to cut the thread by rotation. A link mechanism is connected between the two moving knives corresponding to the two scissors assemblies, and the first moving knife is driven to rotate and drives the second moving knife to rotate synchronously through the link mechanism.

[0009] Preferably, the link mechanism includes two moving knife links respectively corresponding to and connected to the first moving knife and the second moving knife, and an intermediate link connecting the two moving knife links.

[0010] Preferably, the moving knife is connected to a moving knife shaft, the moving knife shaft extends vertically and rotates horizontally, and the moving knife is integrally connected to the moving knife link and rotates around the moving knife shaft as a fulcrum.

[0011] Preferably, a limit pin is connected between the moving knife link and the moving knife at a position deviating from the moving knife shaft.

[0012] Preferably, the limit pin is integrally provided with the moving knife connecting rod and protrudes upward, and a pin hole connected to the limit pin is provided on the moving knife.

[0013] Preferably, the scissor assembly is installed on the scissor base. The scissor base is provided with a forwardly extending mounting beam. The fixed knife is fixed on the mounting beam and the moving knife shaft is rotatably supported on the mounting beam.

[0014] Preferably, a moving knife elastic piece is fixed on the mounting beam. The moving knife elastic piece elastically supports below the moving knife and makes the moving knife fit with the upper fixed knife.

[0015] Preferably, the intermediate connecting rod extends horizontally and moves linearly in the horizontal direction. One end of the moving knife connecting rod is connected to the moving knife shaft and the moving knife, and the other end is connected to the intermediate connecting rod.

[0016] Preferably, the bottom thread cutting device of the embroidery machine further includes a thread cutting drive shaft and a thread cutting connecting rod assembly. The thread cutting drive shaft extends horizontally and moves linearly in the horizontal direction. The thread cutting drive shaft drives the rotation of the moving knife shaft of the first moving knife through the thread cutting connecting rod assembly.

[0017] On the other hand, the present invention also provides an embroidery machine, which includes a plurality of shuttle box assemblies arranged side by side in the horizontal direction. The shuttle box assembly is provided with a shuttle box body and a rotating shuttle assembly, and also includes the bottom thread cutting device described above.

[0018] In the technical solution adopted by the present invention, in two adjacent scissor assemblies arranged close to the intermediate connecting piece, a connecting rod mechanism is connected between the two corresponding moving knives of the two scissor assemblies. The first moving knife is driven to rotate and drives the second moving knife to rotate synchronously through the connecting rod mechanism. Therefore, the second moving knife does not need to be connected to the thread cutting connecting rod assembly. Only one thread cutting connecting rod assembly is needed to drive the corresponding one moving knife. After the moving knife rotates, during the thread cutting process, the second moving knife is driven to rotate synchronously through the connecting rod mechanism, and then the second moving knife performs the thread cutting action synchronously. In this way, for one scissor assembly arranged close to the intermediate connecting piece, there is no need to set a thread cutting connecting rod assembly. Even if the distance between the machine heads is reduced, there will be no interference with the intermediate connecting piece, and at the same time, the normal thread cutting function will not be affected.

[0019] Moreover, compared with the prior art in which the synchronous rotation between two moving knives is achieved through the meshing of a gear and a rack, the connecting rod mechanism has low requirements for the connecting rod material and processing accuracy, and basically does not require maintenance. Therefore, the processing cost can be significantly reduced, and the maintenance cost is also saved.

[0020] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. Description of the Drawings

[0021] The following further describes the present invention with reference to the drawings:

[0022] Figure 1 It is a layout schematic diagram when the bottom thread cutting device in the embodiment is not installed for several shuttle box components (the part of the shuttle box in the example in the figure is for a double-needle embroidery machine).

[0023] Figure 2 It is a schematic diagram when the bottom thread cutting device in the embodiment is installed on the front side of the shuttle box body.

[0024] Figure 3 For Figure 2 The enlarged view at position A in

[0025] Reference numerals: shuttle box body 300, rotating shuttle assembly 301, mounting beam 302, bottom thread cutting device 3, bottom thread cutting drive shaft 31, bottom thread cutting link assembly 32, guide plate 33, moving knife elastic piece 34, scissors assembly 35, fixed knife 351, moving knife 352, fixed knife seat 353, limit pin 354, locking screw 355, link mechanism 36, moving knife link 361, high position part 3611, low position part 3612, intermediate link 362. Detailed implementation manners

[0026] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0027] Those skilled in the art can understand that, without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0028] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For example, the terms such as "upper", "lower", "inner", "outer", "front", "rear", etc. indicating the orientation or position relationship are only based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0029] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but are in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0031] In addition, terms such as "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0032] As Figures 1 to 3 shown, with reference to the structure of an embroidery machine in the prior art, there is provided a frame, on which a plurality of machine heads are mounted on the cross beam of the frame, and an embroidery frame is provided below the machine heads. In addition, a plurality of shuttle box assemblies are arranged side by side in the transverse direction. The shuttle box assembly is provided with a shuttle box body 300 and a rotary shuttle assembly 301. A bottom thread cutting device 3 for cutting the bottom thread is provided on the front side of the shuttle box body 300. The bottom thread cutting device 3 is provided with a scissor assembly 35. An installation beam 302 extends forward from the shuttle box body 300 for installing the scissor assembly 35. The number of shuttle box assemblies does not necessarily correspond to the number of machine heads. In the figure, a double-needle embroidery machine is taken as an example. Therefore, the number of rotary shuttle assemblies and scissor assemblies is twice the number of machine heads, that is, corresponding to the number of needles. For each shuttle box assembly, two rotary shuttle assemblies 301 and two scissor assemblies 35 are provided.

[0033] In the bottom thread cutting device, a plurality of scissor assemblies 35 are arranged side by side in the transverse direction. In addition, the bottom thread cutting device 3 further includes a thread cutting drive shaft 31 provided on the front side of the shuttle box body 300. The thread cutting drive shaft 31 extends in the transverse direction and moves linearly in the transverse direction. The scissor assembly 35 includes a fixed knife 351 and a moving knife 352 that cooperates with the fixed knife to cut the thread. The fixed knife 351 is fixed to the front side of the shuttle box body. The fixed knife can be provided on a fixed knife seat 353 and installed on the installation beam 302. The moving knife 352 is rotatably connected to the installation beam 302 through a moving knife shaft. A thread cutting link assembly 32 is provided between the thread cutting drive shaft 31 and the moving knife 352. One thread cutting link assembly 32 is correspondingly provided for each scissor assembly 35. In this way, one thread cutting drive shaft can correspondingly drive all scissor assemblies through a plurality of thread cutting link assemblies.

[0034] The embroidery frame has a relatively large area and needs to achieve translation in the X and Y directions. The embroidery frame includes a front part disposed on the front side of the shuttle box, a rear part disposed on the rear side of the shuttle box body, and a number of intermediate connectors connecting the front part and the rear part, wherein the intermediate connectors pass through the gaps between adjacent two shuttle box assemblies. Of course, intermediate connectors do not pass through all the gaps between adjacent two shuttle box assemblies.

[0035] Due to the increasing number of headstocks and the decreasing headstock spacing, the space between adjacent two shuttle box assemblies is extremely limited. If intermediate connectors are provided, the arrangement of the thread cutting link assembly closest to the intermediate connectors will be restricted by the space, affecting the further reduction of the headstock spacing.

[0036] In order to further reduce the headstock spacing without affecting the thread cutting function. As Figure 2 and Figure 3 shown, between a pair of adjacent two scissors assemblies (i.e., the adjacent two scissors assemblies disposed on the side close to the intermediate connectors) among a number of scissors assemblies, a link mechanism 36 is connected between the corresponding two moving blades 352, and the first moving blade is driven to rotate and drives the second moving blade to rotate synchronously through the link mechanism 36.

[0037] Here, the way the first moving blade is driven to rotate is the same as the prior art, that is, the thread cutting drive shaft drives the first moving blade to rotate through the thread cutting link assembly.

[0038] In addition, it can be understood that here the second moving blade refers to the moving blade disposed on the side close to the intermediate connectors, and the first moving blade refers to the moving blade disposed on the side far from the intermediate connectors.

[0039] Therefore, the second moving blade does not need to be connected to the thread cutting link assembly. Only one thread cutting link assembly is needed to drive the corresponding one moving blade. After this moving blade rotates, it drives the second moving blade to rotate synchronously through the link mechanism during the thread cutting process, so that the second moving blade performs the thread cutting action synchronously. In this way, for one scissors assembly disposed on the side close to the intermediate connectors, the thread cutting link assembly does not need to be provided. Even if the headstock spacing is reduced, it will not interfere with the intermediate connectors and will not affect the normal thread cutting function.

[0040] Moreover, compared with the prior art where the synchronous rotation between two moving blades is achieved through the meshing of a gear and a rack, the link mechanism has low requirements for the link material and processing accuracy, and basically does not require maintenance. Therefore, the processing cost can be significantly reduced and the maintenance cost can also be saved.

[0041] As one of the implementation manners, the link mechanism 36 is a planar link mechanism, including two moving blade links 361 respectively corresponding to and connected to the first moving blade and the second moving blade, and an intermediate link 362 connecting the two moving blade links. The moving blade 352 is connected with a moving blade shaft, and the moving blade shaft extends vertically and rotates horizontally. The moving blade 352 is integrally connected with the moving blade link 361 and rotates with the moving blade shaft as the fulcrum. The thread cutting drive shaft 31 drives the moving blade shaft of the first moving blade to rotate through the thread cutting link assembly 32. Since the front and rear positions of the moving blade shaft are the same, and the lengths and even structures of the two moving blade links 361 can be exactly the same, together with the intermediate link, they form a parallel double crank link mechanism, so the operation is stable, and the rotation directions of the two moving blades are the same and keep synchronous.

[0042] In order to realize the integral connection of the moving blade 352 and the moving blade link 361 and rotate with the moving blade shaft as the fulcrum, a limit pin 354 is connected between the moving blade link 361 and the moving blade 352 at a position deviating from the moving blade shaft. Specifically, the limit pin 354 is integrally arranged with the moving blade link 361 and protrudes upward, and a pin hole connected to the limit pin 354 is provided on the moving blade 352. Here, the moving blade link is below and the moving blade is above. The moving blade shaft of the moving blade passes through the moving blade link and then is connected to the moving blade. The upper end of the moving blade shaft of the first moving blade is connected with a locking screw 355 above the moving blade to lock and fix the moving blade and the moving blade link. At the same time, with the limit of the limit pin, the integral connection of the moving blade 352 and the moving blade link 361 and the rotation with the moving blade shaft as the fulcrum are realized. The moving blade shaft of the second moving blade can be fixed with the locking screw 355 between the moving blade and the moving blade link, or can be a movable hinge.

[0043] In addition, after the moving blade link 361 is integrally connected with the moving blade 352, it is in a V shape, and the moving blade shaft is connected to the vertex of the V shape. The moving blade link 361 is a stepped structure, including a high position part 3611 and a low position part 3612, wherein the high position part 3611 is connected with the moving blade shaft and the limit pin 354, and the low position part 3612 is connected with the intermediate link 362.

[0044] Specifically, the scissors assembly 35 is installed on the scissors seat. The installation beam 302 is a part of the scissors seat and extends forward. The fixed blade 351 is fixed on the installation beam 302, and the moving blade shaft is rotatably supported on the installation beam 302. The intermediate link 362 is located at the rear side of the installation beam 302, extends horizontally and moves linearly in the horizontal direction. One end of the moving blade link 361 is connected with the moving blade shaft and the moving blade 352, and the other end is connected with the intermediate link 362.

[0045] Furthermore, a moving blade elastic piece 34 is fixed on the installation beam 302. The moving blade elastic piece 34 is in an L-shaped structure. One side is fixed in front of the fixed blade by screws, and the other side elastically supports below the moving blade 352 to make the moving blade fit with the upper fixed blade 351.

[0046] In addition, a guide plate 33 is provided at the rear side of the intermediate connecting rod 361 and is slidably connected to the rear side surface of the intermediate connecting rod, which serves to guide the lateral movement of the intermediate connecting rod.

[0047] Since there are various forms of link mechanisms in the prior art, it can be understood that as long as the first moving cutter can drive the second moving cutter to rotate synchronously through the link mechanism, other conventional link mechanisms can be used for replacement in the prior art.

[0048] It can be understood that the above-described bottom thread cutting device can be applied not only to double-needle embroidery machines but also to embroidery machines of other models, such as single-needle embroidery machines.

[0049] As described above, the above is only the specific implementation manner of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. Bottom thread cutting device for embroidery machine, comprising two scissor assemblies arranged side by side in the transverse direction, wherein each scissor assembly includes a fixed blade and a moving blade that cooperates with the fixed blade to cut the thread by rotation, and is characterized in that, A connecting rod mechanism is connected between two moving blades corresponding to two scissor assemblies. The first moving blade is driven to rotate and drives the second moving blade to rotate synchronously through the connecting rod mechanism.

2. The bottom thread trimming device of an embroidery machine according to claim 1, characterized in that, The connecting rod mechanism includes two moving blade connecting rods respectively connected to the first moving blade and the second moving blade, and an intermediate connecting rod connecting the two moving blade connecting rods.

3. The bottom thread trimming device of an embroidery machine according to claim 2, characterized in that, The moving blade is connected with a moving blade shaft. The moving blade shaft extends vertically and rotates horizontally. The moving blade is integrally connected with the moving blade connecting rod and rotates with the moving blade shaft as a fulcrum.

4. The bottom thread trimming device of an embroidery machine according to claim 3, characterized in that, A limiting pin is connected between the moving blade connecting rod and the moving blade at a position deviating from the moving blade shaft.

5. The bottom thread cutting device of an embroidery machine according to claim 4, characterized in that, The limiting pin is integrally arranged with the moving blade connecting rod and protrudes upward. A pin hole connected to the limiting pin is provided on the moving blade.

6. The bottom thread trimming device of the embroidery machine according to claim 3, characterized in that, The scissor assembly is installed on a scissor base. The scissor base is provided with a forward-extending mounting beam. The fixed blade is fixed on the mounting beam, and the moving blade shaft is rotatably supported on the mounting beam.

7. The bottom thread trimming device of an embroidery machine according to claim 6, characterized in that, A moving blade spring piece is fixed on the mounting beam. The moving blade spring piece elastically supports below the moving blade and makes the moving blade fit with the upper fixed blade.

8. The bottom thread trimming device of the embroidery machine according to claim 6, characterized in that, The intermediate connecting rod extends horizontally and moves linearly in the horizontal direction. One end of the moving blade connecting rod is connected to the moving blade shaft and the moving blade, and the other end is connected to the intermediate connecting rod.

9. The bottom thread trimming device of the embroidery machine according to claim 3, wherein, The bottom thread cutting device of the embroidery machine further includes a thread cutting drive shaft and a thread cutting connecting rod assembly. The thread cutting drive shaft extends horizontally and moves linearly in the horizontal direction. The thread cutting drive shaft drives the moving blade shaft of the first moving blade to rotate through the thread cutting connecting rod assembly.

10. An embroidery machine, comprising a plurality of shuttle box assemblies arranged side by side in the transverse direction, the shuttle box assembly being provided with a shuttle box body and a rotating shuttle assembly, characterized in that, It further includes the bottom thread cutting device according to any one of claims 1 to 9.

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