Trimming mechanism

Abstract

The utility model relates to the technical field of sewing machines, and discloses an edge cutting mechanism which comprises an edge cutting base, a guide groove is formed in one side of the edge cutting base, a movable cutter bar is connected in the guide groove in a sliding mode, two sets of fourth screws are connected to the upper end of the movable cutter bar in an inserted mode, and one ends of the two sets of fourth screws penetrate through the movable cutter bar and are in threaded connection with a movable cutter. A bearing through which a transmission shaft of the sewing machine penetrates is mounted at the lower end of the trimming seat; through cooperation of the trimming base, the eccentric wheel, the connecting rod, the movable cutter bar, the movable cutter, the fixed cutter and the guide block, the eccentric wheel is driven to rotate through a transmission shaft of the sewing machine, the connecting rod is driven to drive the cutter bar to move up and down according to the eccentric principle, then the movable cutter is matched with the fixed cutter to cut cloth, and the labor intensity of manual cutting is reduced; the cloth cutting efficiency is improved, and the work efficiency is improved while the cloth cutting quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a trimming mechanism. Background Technique

[0002] According to the uses of sewing machines, they can be divided into household sewing machines, industrial sewing machines, and service industry sewing machines between the two; according to the driving methods, they can be divided into hand-cranked, foot-operated, and electric sewing machines; according to the sewing stitches, they can be divided into imitation hand-sewn stitches, lock stitches, single-thread chain stitches, double-thread or multi-thread chain stitches, single-thread or multi-thread overedge chain stitches, and multi-thread cover chain stitch sewing machines.

[0003] When the existing sewing machine sews a fabric tape, it usually leaves a margin on the fabric strip for easy sewing. After sewing, it is necessary to manually cut off the scraps with scissors, which increases the workload of the laborer. The manual trimming has a poor flatness of the fabric edge cutting and low work efficiency. Therefore, we need to propose a trimming mechanism. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a trimming mechanism. A trimming mechanism is arranged on a sewing machine, and then the eccentric principle of an eccentric wheel is used to drive the movable knife to move up and down synchronously when sewing the fabric tape, so as to realize the cutting function, improve the cutting efficiency of the fabric tape, and improve the work efficiency, so as to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a trimming mechanism, including a trimming base, a guiding groove is opened on one side of the trimming base, a movable knife rod is slidably connected in the guiding groove, two groups of fourth screws are inserted at the upper end of the movable knife rod, one ends of the two groups of fourth screws penetrate through the movable knife rod and are threadedly connected with a movable knife, a bearing for the sewing machine transmission shaft to penetrate through is installed at the lower end of the trimming base, an eccentric wheel drivingly connected with the sewing machine transmission shaft is arranged on one side of the bearing, the eccentric wheel is arranged directly below the movable knife rod, a connecting rod is sleeved at one end of the eccentric wheel, a sixth screw threadedly connected with the connecting rod is inserted at the lower end of the movable knife rod, a guiding block for limiting the movable knife rod is installed at the upper end of one side of the trimming base, a needle plate is detachably installed at the upper end of the trimming base, a fixed knife pressing plate is detachably connected to one side of the needle plate, and a fixed knife is arranged between the needle plate and the fixed knife pressing plate.

[0006] Preferably, one side of the fixed knife is in contact with one side of the movable knife, and two groups of third screws inserted into the needle plate are threadedly connected to one side of the fixed knife pressing plate.

[0007] Preferably, four groups of fifth screws threadedly connected to the trimming base are inserted into one side of the guiding block, and a sliding hole for the movable knife rod to slidably connect is opened on the other side of the guiding block.

[0008] Preferably, one end of the sixth screw penetrates through the connecting rod and is threadedly connected with a nut. A seventh screw threadedly connected with the eccentric wheel is inserted into the lower end of the connecting rod. A collar for sleeving the eccentric wheel is arranged at the lower end of the connecting rod.

[0009] Preferably, two groups of first screws are arranged on the upper surface of the edge-trimming base. Gaskets are inserted at the lower ends of the two groups of first screws, and the lower ends of the two groups of first screws are threadedly connected with the sewing machine.

[0010] Preferably, a convex plate for inserting the needle plate is arranged at the upper end of the edge-trimming base. Two groups of second screws threadedly connected with the convex plate are inserted into one side of the needle plate.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The present utility model mainly realizes the cooperation among the edge-trimming base, the eccentric wheel, the connecting rod, the moving cutter bar, the movable cutter, the fixed cutter and the guide block. The eccentric wheel is driven to rotate by the transmission shaft of the sewing machine. By using the eccentric principle, the connecting rod is driven to drive the cutter bar to move up and down, so that the movable cutter cooperates with the fixed cutter to perform the cutting operation on the fabric. This reduces the labor intensity of manual cutting, improves the cutting efficiency of the fabric, and improves the working efficiency while improving the cutting quality of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is an exploded structural schematic diagram of the present utility model;

[0014] Figure 2 is a structural schematic diagram of the moving cutter bar of the present utility model;

[0015] Figure 3 is a structural schematic diagram of the fixed cutter of the present utility model.

[0016] In the figure: 1. Edge-trimming base; 2. First screw; 3. Gasket; 4. Needle plate; 5. Second screw; 6. Fixed cutter; 7. Fixed cutter pressing plate; 8. Third screw; 9. Movable cutter; 10. Fourth screw; 11. Moving cutter bar; 12. Guide block; 13. Fifth screw; 14. Sixth screw; 15. Connecting rod; 16. Nut; 17. Eccentric wheel; 18. Seventh screw; 19. Bearing; 20. Guide groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0018] See also Figures 1-3 The utility model provides a technical solution: a trimming mechanism, including a trimming seat 1, a guide groove 20 is provided on one side of the trimming seat 1, a movable knife rod 11 is slidably connected in the guide groove 20, two groups of fourth screws 10 are inserted into the upper end of the movable knife rod 11, one end of the two groups of fourth screws 10 penetrates the movable knife rod 11 and is threadedly connected with a movable knife 9, a bearing 19 for a sewing machine transmission shaft to penetrate is installed at the lower end of the trimming seat 1, and a bearing 19 is provided on one side of the bearing 19 to be connected to the sewing machine transmission shaft. An eccentric wheel 17 is dynamically connected and is arranged just below the moving knife rod 11. A connecting rod 15 is sleeved on one end of the eccentric wheel 17. A sixth screw 14 threadedly connected to the connecting rod 15 is inserted at the lower end of the moving knife rod 11. A guide block 12 for limiting the moving knife rod 11 is installed at the upper end of one side of the chamfering seat 1. A needle plate 4 is detachably installed on the upper end of the chamfering seat 1. A fixed knife pressure plate 7 is detachably connected to one side of the needle plate 4. A fixed knife 6 is arranged between the needle plate 4 and the fixed knife pressure plate 7.

[0019] One side of the fixed knife 6 is in contact with one side of the movable knife 9, and one side of the fixed knife pressure plate 7 is plugged with two sets of third screws 8 threadedly connected to the needle plate 4. The movable knife 9 moves up and down to realize the cutting function of the cloth, thereby improving work efficiency and reducing manual labor intensity.

[0020] Four groups of fifth screws 13 threadedly connected to the chamfering edge seat 1 are inserted on one side of the guide block 12, and a sliding hole for the sliding connection of the movable tool rod 11 is opened on the other side of the guide block 12. The guide block 12 is convenient for limiting the position of the movable tool rod 11 when it moves up and down, avoiding the angle deviation of the movable tool rod 11 and improving the smoothness of the cutting.

[0021] One end of the sixth screw 14 passes through the connecting rod 15 and is threadedly connected with a nut 16. The lower end of the connecting rod 15 is inserted with a seventh screw 18 threadedly connected to the eccentric wheel 17. The lower end of the connecting rod 15 is provided with a ring for being mounted on the eccentric wheel 17. The seventh screw 18 facilitates the installation of the eccentric wheel 17 in the lower end ring of the connecting rod 15, thereby further improving the stability of the transmission.

[0022] Two groups of first screws 2 are arranged on the upper surface of the chamfering edge seat 1, and gaskets 3 are inserted at the lower ends of the two groups of first screws 2. The lower ends of the two groups of first screws 2 are threadedly connected to the sewing machine, and the first screws 2 pass through the gaskets 3 and are bolted to the operating table of the sewing machine. The two groups of first screws 2 are diagonally arranged, which further improves the stability of the installation.

[0023] A convex plate for inserting a needle plate 4 is provided at the upper end of the chamfering edge seat 1, and two groups of second screws 5 threadedly connected to the convex plate are inserted on one side of the needle plate 4. The convex plate (not marked in the figure) is used to facilitate the rapid positioning of the needle plate 4, so that the needle plate 4 can be fixed by the second screws 5, thereby improving the stability of the installation of the needle plate 4.

[0024] When in use, the edge-trimming seat 1 is installed on the surface of the operation table of the sewing machine through the first screw 2. The needle plate 4 is installed at the upper end of the edge-trimming seat 1 through the second screw 5. The fixed knife 6 is placed on one side of the needle plate 4, and after the fixed knife pressing plate 7 is pressed tightly, it is fixed on the needle plate 4 through the third screw 8. The movable knife 9 is installed at the upper end of the movable knife rod 11 through the fourth screw 10. The movable knife rod 11 is inserted into the guide groove 20 from the lower end of the edge-trimming seat 1, and the connecting rod 15 on the eccentric wheel 17 is bolted to the lower end of the movable knife rod 11 through the seventh screw 18. The transmission shaft on the sewing machine penetrates through the bearing 19 and is installed at one end of the eccentric wheel 17, so as to provide kinetic energy to drive the eccentric wheel 17 to rotate, drive the movable knife rod 11 to move up and down, make the movable knife 9 on the movable knife rod 11 fit with the fixed knife 6, and then cut the fabric during the reciprocating movement of the movable knife 9 up and down, improving the processing efficiency of the fabric.

[0025] 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. Edge trimming mechanism, including an edge trimming seat (1), characterized in that: A guide groove (20) is provided on one side of the chamfering seat (1), a movable knife rod (11) is slidably connected in the guide groove (20), two groups of fourth screws (10) are inserted into the upper end of the movable knife rod (11), one end of the two groups of fourth screws (10) penetrates the movable knife rod (11) and is threadedly connected to a movable knife (9), a bearing (19) for a sewing machine transmission shaft to penetrate is installed at the lower end of the chamfering seat (1), an eccentric wheel (17) which is transmission-connected to the sewing machine transmission shaft is arranged on one side of the bearing (19), and the eccentric wheel (17) The eccentric wheel (17) is arranged directly below the movable knife rod (11), one end of which is sleeved with a connecting rod (15), the lower end of the movable knife rod (11) is plugged with a sixth screw (14) threadedly connected to the connecting rod (15), the upper end of one side of the chamfering seat (1) is provided with a guide block (12) for limiting the movable knife rod (11), the upper end of the chamfering seat (1) is detachably provided with a needle plate (4), one side of the needle plate (4) is detachably connected with a fixed knife pressure plate (7), and a fixed knife (6) is provided between the needle plate (4) and the fixed knife pressure plate (7).

2. The trimming mechanism according to claim 1, wherein: One side of the fixed knife (6) is in contact with one side of the movable knife (9), and one side of the fixed knife pressure plate (7) is plugged with two groups of third screws (8) threadedly connected to the needle plate (4).

3. The edge trimming mechanism according to claim 1, characterized in that: Four groups of fifth screws (13) threadedly connected to the chamfering edge seat (1) are inserted on one side of the guide block (12), and a sliding hole for sliding connection of the movable knife rod (11) is opened on the other side of the guide block (12).

4. The edge trimming mechanism according to claim 1, characterized in that: One end of the sixth screw (14) passes through the connecting rod (15) and is threadedly connected to a nut (16); a seventh screw (18) threadedly connected to an eccentric wheel (17) is inserted into the lower end of the connecting rod (15); and a collar for sleeved with the eccentric wheel (17) is provided at the lower end of the connecting rod (15).

5. The edge trimming mechanism according to claim 1, characterized in that: Two groups of first screws (2) are arranged on the upper surface of the chamfering edge seat (1), gaskets (3) are inserted at the lower ends of the two groups of first screws (2), and the lower ends of the two groups of first screws (2) are connected to the sewing machine threads.

6. The edge trimming mechanism according to claim 1, characterized in that: The upper end of the chamfered edge seat (1) is provided with a convex plate for the needle plate (4) to be inserted into, and one side of the needle plate (4) is inserted with two groups of second screws (5) threadedly connected to the convex plate.

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