Automatic bottom thread changing device of sewing machine

Abstract

The automatic bottom thread changing device comprises the sewing machine and a bottom thread box, a mounting groove is formed in one side of the sewing machine, and a mounting block is fixedly arranged on the side face of the sewing machine. A bottom line replacing assembly for automatically replacing a bottom line box is arranged above the mounting block in a sliding manner; the bottom thread changing assembly comprises a limiting ring, a connecting rod, a vacuum suction cup, a rotating module and a telescopic module, and two sets of material preparing grooves corresponding to the vacuum suction cup are formed in the side face of the sewing machine. The first servo motor drives the limiting ring to move above the mounting block, the bottom thread box in the mounting groove is adsorbed through one set of vacuum suction cups, then the other set of vacuum suction cups adsorb the bottom thread box from the interior of the material preparation groove, and the first servo motor drives the limiting ring to be away from the sewing machine as a whole. Then a second servo motor is started to drive two sets of connecting rods to rotate by 90 degrees, the other set of vacuum suction cups drives a new bottom thread box to enter a mounting groove, replacement by workers is avoided, and therefore the bottom thread replacement efficiency of the sewing machine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to an automatic bobbin-changing device for sewing machines. Background Technique

[0002] Garment processing belongs to a labor-intensive industry. Sewing machines are widely used in the garment processing industry. A sewing machine uses one or more bobbin threads and needle threads to form one or more stitches on the sewing material, so as to interweave or sew together one or more layers of sewing materials. Bobbin threads are required during the use of sewing machines. A bobbin thread is a kind of thread used during the sewing process. It passes through the fabric from below the sewing machine to complete the sewing. The bobbin thread is usually a relatively thick thread, mainly used to connect and fix the fibers of the fabric, making the stitches firm. The bobbin thread is hidden inside the fabric during the sewing process, so its color can usually match the fabric, making the stitches less noticeable. The functions of the bobbin thread include sewing and strengthening, that is, connecting the edges of the fabric or patches, fixing the structure of the fabric and enhancing durability;

[0003] Changing the bobbin thread of a sewing machine is a cumbersome manual labor. Limited by the capacity of the bobbin, a new bobbin full of bobbin thread can only be used for two to three minutes. That is to say, every two to three minutes, a new bobbin case needs to be manually replaced. Manually replacing the bobbin case affects the overall production efficiency and has obvious deficiencies; therefore, we need to propose an automatic bobbin-changing device for sewing machines. Content of the Utility Model

[0004] The purpose of the utility model is to provide an automatic bobbin-changing device for sewing machines. A bobbin case inside the installation groove is adsorbed by a group of vacuum suckers, and then a bobbin case is adsorbed from inside the stock groove by another group of vacuum suckers. The first servo motor drives the whole limiting ring away from the sewing machine, and then the rotation module drives the two groups of vacuum suckers to rotate by 90 degrees, and then the new bobbin case is inserted into the installation groove to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An automatic bobbin-changing device for sewing machines, including a sewing machine and a bobbin case. An installation groove is opened on one side of the sewing machine, and an installation block is fixedly arranged on the side of the sewing machine;

[0007] A bobbin-changing component for automatically changing the bobbin case is slidably arranged above the installation block;

[0008] The bottom thread changing assembly includes a limit ring, a connecting rod, a vacuum suction cup, a rotating module and a telescopic module. There are two sets of connecting rods and vacuum suction cups. The two vacuum suction cups are arranged on the side of the corresponding connecting rod close to the sewing machine. The outer arc surface of the limit ring is provided with limit grooves corresponding to the two connecting rods, and the side surface of the sewing machine is provided with two sets of stock preparation grooves corresponding to the vacuum suction cups.

[0009] Preferably, an installation plate is fixedly installed on the lower surface of the limit ring, a clamping convex block is fixedly arranged on the bottom surface of the installation plate, a sliding groove corresponding to the clamping convex block is opened on the upper surface of the installation block, a lead screw is rotatably arranged inside the sliding groove, the clamping convex block is threadedly sleeved on the outer arc surface of the lead screw, a first servo motor is bolted to the side of the installation block away from the sewing machine, and the lead screw is key-connected to the output end of the first servo motor.

[0010] Preferably, the rotating module includes a support block, a second servo motor and a mounting post. The support block is fixedly installed on the inner arc surface of the limit ring. The second servo motor is bolted to the upper surface of the support block. The mounting post is key-connected to the output end of the second servo motor, and the two connecting rods are fixedly installed on the outer arc surface of the mounting post.

[0011] Preferably, there are two sets of telescopic modules. Each telescopic module includes a telescopic sleeve, a telescopic rod, a compression spring and a limit post. The telescopic sleeve is fixedly installed at one end of the connecting rod. The telescopic rod is slidably arranged inside the telescopic sleeve. The limit post is fixedly installed at one end of the telescopic rod located inside the telescopic sleeve. The compression spring is fixedly arranged between the limit post and the telescopic sleeve.

[0012] Preferably, the two vacuum suction cups are respectively installed at one end of the corresponding telescopic rod, and the two connecting rods are vertically arranged on the outer arc surface of the mounting post.

[0013] Preferably, connecting columns are fixedly arranged inside the two stock preparation grooves, and several bottom thread cassettes are arranged inside the two stock preparation grooves.

[0014] Preferably, a collection box is fixedly installed on the side of the sewing machine close to the installation groove, and the collection box is located below the installation block.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] The utility model drives a limiting ring to move above an installation block through a first servo motor, adsorbs a bottom line box inside an installation groove through a group of vacuum suction cups, and then adsorbs the bottom line box from inside a stock preparation groove through another group of vacuum suction cups. The first servo motor drives the whole limiting ring away from the sewing machine, and then starts a second servo motor to drive two connecting rods to rotate by 90 degrees, so that the vacuum suction cups adsorbing the waste bottom line box loosen the bottom line box and drop it into a collection box, and the other group of vacuum suction cups drives a new bottom line box into the installation groove, avoiding the need for staff to replace it, thereby improving the efficiency of replacing the bottom line of the sewing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the bottom line box placed in the utility model;

[0018] Figure 2 is a schematic structural diagram of the bottom line box taken out in the utility model;

[0019] Figure 3 is a schematic structural diagram of a bottom line changing assembly in the utility model;

[0020] Figure 4 is a cross-sectional view of a telescopic sleeve in the utility model.

[0021] In the figure: 1, sewing machine; 2, collection box; 3, installation block; 4, bottom line changing assembly; 5, bottom line box; 6, installation groove; 7, connecting column; 8, first servo motor; 9, limiting ring; 10, lead screw; 11, sliding groove; 12, clamping convex block; 13, mounting plate; 14, support block; 15, limiting groove; 16, second servo motor; 17, mounting column; 18, connecting rod; 19, telescopic sleeve; 20, telescopic rod; 21, vacuum suction cup; 22, compression spring; 23, limiting column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] As Figures 1-4 shown, an automatic bottom line changing device for a sewing machine includes a sewing machine 1 and a bottom line box 5. An installation groove 6 is opened on one side of the sewing machine 1, and an installation block 3 is fixedly arranged on the side surface of the sewing machine 1;

[0024] A bottom line changing assembly 4 for automatically replacing the bottom line box 5 is slidably arranged above the installation block 3;

[0025] The bottom thread replacement assembly 4 includes a limit ring 9, a connecting rod 18, a vacuum chuck 21, a rotation module, and a telescopic module. There are two sets of connecting rods 18 and vacuum chucks 21. The two sets of vacuum chucks 21 are arranged on the side of the corresponding connecting rod 18 close to the sewing machine 1. The outer arc surface of the limit ring 9 is provided with limit grooves 15 corresponding to the two sets of connecting rods 18, and the side surface of the sewing machine 1 is provided with two sets of stock preparation grooves corresponding to the vacuum chucks 21. The limit grooves 15 are arranged on the outer arc surface of the limit ring 9 slightly above, so as to limit the connecting rod 18 through the limit grooves 15, ensure that the two sets of connecting rods 18 rotate 90 degrees each time, and adsorb the bottom thread cassette 5 through the vacuum chuck 21, so as to achieve the purpose of replacing the bottom thread cassette 5.

[0026] Furthermore, an installation plate 13 is fixedly installed on the lower surface of the limit ring 9, a clamping convex block 12 is fixedly arranged on the bottom surface of the installation plate 13, a sliding groove 11 corresponding to the clamping convex block 12 is opened on the upper surface of the installation block 3, a lead screw 10 is rotatably arranged inside the sliding groove 11, the clamping convex block 12 is threadedly sleeved on the outer arc surface of the lead screw 10, a first servo motor 8 is bolted to the side of the installation block 3 away from the sewing machine 1, and the lead screw 10 is key-connected to the output end of the first servo motor 8. With the above design, when the first servo motor 8 is started to drive the lead screw 10 to rotate, the lead screw 10 drives the clamping convex block 12 to move along the sliding groove 11 through the thread, thereby driving the limit ring 9 to move.

[0027] Furthermore, the rotation module includes a support block 14, a second servo motor 16, and an installation column 17. The support block 14 is fixedly installed on the inner arc surface of the limit ring 9, the second servo motor 16 is bolted to the upper surface of the support block 14, the installation column 17 is key-connected to the output end of the second servo motor 16, and the two sets of connecting rods 18 are fixedly installed on the outer arc surface of the installation column 17. With the above design, the second servo motor 16 is installed on the inner bottom side of the limit ring 9 through the support block 14. When the second servo motor 16 is started, it drives the installation column 17 to rotate, thereby driving the vacuum chuck 21 to rotate between the stock preparation groove and the installation groove 6.

[0028] Furthermore, there are two sets of telescopic modules. Each of the two sets of telescopic modules includes a telescopic sleeve 19, a telescopic rod 20, a compression spring 22, and a limit post 23. The telescopic sleeve 19 is fixedly installed at one end of the connecting rod 18, the telescopic rod 20 is slidably arranged inside the telescopic sleeve 19, the limit post 23 is fixedly installed at one end of the telescopic rod 20 located inside the telescopic sleeve 19, and the compression spring 22 is fixedly arranged between the limit post 23 and the telescopic sleeve 19. With the above design, the telescopic rod 20 can be connected to the inside of the telescopic sleeve 19 through the limit post 23. When a set of vacuum chucks 21 drives a set of bottom thread cassettes 5 into the installation groove 6, the other set may contact the bottom thread cassette 5 inside the stock preparation groove. At this time, the telescopic rod 20 will compress the compression spring 22 and enter the telescopic sleeve 19, so as to ensure that the other set of vacuum chucks 21 will not be squeezed and damaged when replacing the bottom thread cassette 5.

[0029] Further, two groups of vacuum suction cups 21 are respectively installed at one end of the corresponding telescopic rods 20, and two groups of connecting rods 18 are vertically arranged on the outer arc surface of the mounting column 17. With the above design, the two groups of connecting rods 18 are arranged at a right angle on the outer arc surface of the mounting column 17, so as to ensure that when one group of vacuum suction cups 21 is parallel to the mounting groove 6, the other group of vacuum suction cups 21 is parallel to the stock preparation groove.

[0030] Further, connecting columns 7 are fixedly arranged inside both groups of stock preparation grooves, and several groups of bottom line boxes 5 are arranged inside both groups of stock preparation grooves. With the above design, several groups of bottom line boxes 5 are sleeved on the outer arc surface of the connecting column 7 and are located inside the stock preparation grooves, thus facilitating the replacement of the bottom line boxes 5.

[0031] Further, a collection box 2 is fixedly installed on one side of the sewing machine 1 close to the mounting groove 6, and the collection box 2 is located below the mounting block 3. With the above design, when one group of vacuum suction cups 21 takes out the bottom line box 5 inside the mounting groove 6 and then puts down the bottom line box 5, it will fall into the collection box 2, thereby collecting the used collection box 2.

[0032] Working principle: Start the first servo motor 8 to drive the limiting ring 9 to move above the mounting block 3, and drive the vacuum suction cup 21 to contact the bottom line box 5 inside the mounting groove 6. Adsorb the bottom line box 5 inside the mounting groove 6 through one group of vacuum suction cups 21, and then adsorb the bottom line box 5 from inside the stock preparation groove through the other group of vacuum suction cups 21. The first servo motor 8 drives the limiting ring 9 to move away from the sewing machine 1 as a whole. Then start the second servo motor 16 to drive the two groups of connecting rods 18 to rotate by ninety degrees. The vacuum suction cup 21 adsorbing the waste bottom line box 5 releases the bottom line box 5 and drops it into the collection box 2, and the other group of vacuum suction cups 21 drives the new bottom line box 5 into the mounting groove 6.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic bobbin thread changing device for a sewing machine, characterized in that, Including: a sewing machine and a bobbin case. An installation groove is provided on one side of the sewing machine, and an installation block is fixedly arranged on the side surface of the sewing machine; A bobbin-changing assembly for automatically changing the bobbin case is slidably arranged above the installation block; The bobbin-changing assembly includes a limiting ring, a connecting rod, a vacuum suction cup, a rotating module and a telescopic module. There are two groups of the connecting rod and the vacuum suction cup. The two groups of vacuum suction cups are arranged on the side of the corresponding connecting rod close to the sewing machine. Limiting grooves corresponding to the two groups of connecting rods are provided on the outer arc surface of the limiting ring, and two groups of stock preparation grooves corresponding to the vacuum suction cups are provided on the side surface of the sewing machine.

2. The automatic bobbin change device for a sewing machine according to claim 1, characterized in that: An installation plate is fixedly installed on the lower surface of the limiting ring. A clamping convex block is fixedly arranged on the bottom surface of the installation plate. A sliding groove corresponding to the clamping convex block is provided on the upper surface of the installation block. A lead screw is rotatably arranged inside the sliding groove. The clamping convex block is threadedly sleeved on the outer arc surface of the lead screw. A first servo motor is bolted to the side of the installation block away from the sewing machine, and the lead screw is key-connected to the output end of the first servo motor.

3. The automatic bobbin change device for a sewing machine according to claim 2, characterized in that: The rotating module includes a support block, a second servo motor and an installation column. The support block is fixedly installed on the inner arc surface of the limiting ring. The second servo motor is bolted to the upper surface of the support block. The installation column is key-connected to the output end of the second servo motor, and the two groups of connecting rods are fixedly installed on the outer arc surface of the installation column.

4. The automatic bobbin change device for a sewing machine according to claim 3, wherein: There are two groups of telescopic modules. Each of the two groups of telescopic modules includes a telescopic sleeve, a telescopic rod, a compression spring and a limiting column. The telescopic sleeve is fixedly installed at one end of the connecting rod. The telescopic rod is slidably arranged inside the telescopic sleeve. The limiting column is fixedly installed at one end of the telescopic rod located inside the telescopic sleeve. The compression spring is fixedly arranged between the limiting column and the telescopic sleeve.

5. The automatic bobbin change device for a sewing machine according to claim 4, characterized in that: The two groups of vacuum suction cups are respectively installed at one end of the corresponding telescopic rod, and the two groups of connecting rods are vertically arranged on the outer arc surface of the installation column.

6. The automatic bobbin change device for a sewing machine according to claim 1, characterized in that: Connecting columns are fixedly arranged inside the two groups of stock preparation grooves, and several groups of bobbin cases are arranged inside the two groups of stock preparation grooves.

7. The automatic bobbin replacement device for a sewing machine according to claim 1, wherein: A collection box is fixedly installed on the side of the sewing machine close to the installation groove, and the collection box is located below the installation block.

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