Tightening device for lockstitch sewing machine

Abstract

The utility model discloses a tightening device for a lockstitch sewing machine, which relates to the technical field of lockstitch sewing machines and comprises a sleeve, a fastener is mounted on the front wall of the sleeve in a penetrating manner, a movable rod is movably mounted on the inner side of the sleeve, the rear end of the fastener is abutted against the front wall of the movable rod, a connecting block is mounted at the bottom end of the movable rod, and the connecting block is movably mounted on the inner side of the sleeve. A connecting plate is installed on one side of the connecting block, a connecting rod is installed on one side of the connecting plate, a fixing plate is installed on the outer side of the connecting rod, a pulley is installed on the outer side of the connecting rod, and a movable groove is formed in the inner side of one end of the connecting rod. The sleeve and the movable rod are installed, the front wall of the sleeve and the fastening piece are limited, the movable rod moves on the inner side of the sleeve, the fastening piece rotates to move on the front wall of the sleeve, the fastening piece abuts against the front wall of the movable rod backwards, the fastening piece fastens the movable rod, stability of the movable rod is guaranteed, and the height of the device is adjusted through the movable rod. And a user can conveniently adjust the tension of the thread.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of flat -seam machine, concretely is a flat -seam machine is with tight device. BACKGROUND

[0002] Flat -seam sewing machine mainly is with a sewing line, forms a kind of stitch on the material, makes one or more layers of material interlaced or sewn up machine. Flat -seam machine is combined with needle and rotating shuttle below needle plate, and face line and bottom line are combined on the fabric to form a seam. When the sewing machine works, the tension of face line and bottom line needs to be adjusted to ensure the flatness and beauty of seam, and the tension of face line of sewing machine is mainly adjusted by the thread tightener working with nut and spring, and the distance between the two compression pads of thread tightener for clamping face line is reduced by rotating nut and compressing spring, to realize the adjustment of face line tension.

[0003] Patent document CN210341302U discloses a thread tightener for flat -seam machine, which discloses "a thread tightener for flat -seam machine, including tight line ware body, the tight line ware body includes fixed plate, fixedly arranged on the fixed plate Support shaft, fixed compression pad, movable compression pad and compression mechanism arranged on the support shaft in sequence, the fixed compression pad is fixedly arranged on the support shaft, and the first anti -slip layer is arranged on the side surface of the fixed compression pad close to the movable compression pad, a plurality of elastic stoppers are arranged on the first anti -slip layer along the circumferential direction of the fixed compression pad, the outer side wall of the elastic stopper and close to the end of the movable compression pad is equipped with lead-in slope, the movable compression pad is slidably sleeved on the support shaft, and the second anti -slip layer is arranged on the side surface of the movable compression pad close to the fixed compression pad".

[0004] However, the thread tightener lacks the height adjustment structure inside, which is inconvenient for users to adjust the tension of the thread. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a thread tightener for flat -seam machine to solve the technical problem that the thread tightener lacks the height adjustment structure inside, which is inconvenient for users to adjust the tension of the thread.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: A tension device for flat sewing machine, install fastener on the front wall of the sleeve, the inner side of the sleeve is movably installed with a movable rod, the rear end of the fastener is against the front wall of the movable rod, the bottom end of the movable rod is installed with a connecting block, one side of the connecting block is installed with a connecting plate, one side of the connecting plate is installed with a connecting rod, the outer side of the connecting rod is installed with a fixed plate, the outer side of the connecting rod is installed with a pulley, the inner side of one end of the connecting rod is provided with a movable slot, the inner side of the movable slot is movably installed with a limit ring, the inner side of the limit ring is installed with a threaded rod, one end of the threaded rod is installed with a handle.

[0007] Preferably, the outer side of the threaded rod is movably installed with an internal thread ring through threads, and the outer side of the internal thread ring is installed with an assembly plate.

[0008] Preferably, one side of the assembly plate is installed with an elastic rod, one end of the elastic rod is installed with a movable clamp plate, and the movable clamp plate is sleeved on the outer side of the pulley.

[0009] Preferably, one end of the connecting rod is installed with a sliding rail.

[0010] Preferably, the outer wall of the elastic rod is installed with a guide, and the guide is movable on the outer side of the sliding rail.

[0011] Preferably, the top end of the sleeve is installed with a mounting plate.

[0012] Preferably, the inner side of the mounting plate is installed with a mounting screw, and the mounting screw is located on the outer side of the sleeve.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1. The utility model discloses a sleeve and a movable rod are installed, the front wall of the sleeve is limited with the fastener, the movable rod is movable in the inner side of the sleeve, the fastener rotates and moves on the front wall of the sleeve, the fastener is against the front wall of the movable rod, the fastener is fastened to the movable rod, guarantees the stability of the movable rod, the movable rod adjusts the height of the device, and the user is convenient for adjusting the tension of the line.

[0015] 2. The utility model discloses a movable clamp plate and a fixed plate are installed, the user holds the handle and drives the threaded rod to rotate, the outer side of the threaded rod drives the internal thread ring to move through threads, the internal thread ring drives the assembly plate to move, the assembly plate fixes the elastic rod, one end of the elastic rod is connected with the movable clamp plate, the movable clamp plate is sleeved on the outer side of the pulley, the position of the movable clamp plate is convenient to adjust, the movable clamp plate and the fixed plate limit the line, make things convenient for the line transmission, the elastic rod is fixed to the outer wall guide, the guide is movable on the outer side of the sliding rail, guarantee that the movable clamp plate is adjusted position stably, make things convenient for adjusting the extrusion force of the movable clamp plate and the fixed plate. DRAWINGS

[0016] Figure 1 It is the whole structure schematic view of the utility model;

[0017] Figure 2 It is the cross section structure schematic view of the utility model;

[0018] Figure 3 It is the movable clamping plate structure schematic view of the utility model;

[0019] Figure 4 It is the screw rod structure schematic view of the utility model.

[0020] In the drawing: 1, sleeve pipe;2, mounting plate;3, mounting screw;4, fastener;5, movable rod;6, connecting block;7, connecting plate;8, connecting rod;9, fixed plate;10, pulley;11, limit ring;12, threaded rod;13, handle;14, internal thread ring;15, assembling plate;16, elastic rod;17, guide;18, movable clamping plate;19, slide rail. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] In the description of the utility model, it should be explained that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the utility model, it should be explained that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 A thread tightening device for a flat sewing machine, comprising: a sleeve 1, a fastener 4 is installed through the front wall of the sleeve 1, a movable rod 5 is movably installed on the inner side of the sleeve 1, the rear end of the fastener 4 abuts against the front wall of the movable rod 5, a connecting block 6 is installed at the bottom end of the movable rod 5, a connecting plate 7 is installed on one side of the connecting block 6, a connecting rod 8 is installed on one side of the connecting plate 7, a fixed plate 9 is installed on the outer side of the connecting rod 8, a pulley 10 is installed on the outer side of the connecting rod 8, a movable slot is formed in one end of the connecting rod 8, a limiting ring 11 is movably installed on the inner side of the movable slot, a threaded rod 12 is installed on the inner side of the limiting ring 11, and a handle 13 is installed on one end of the threaded rod 12.

[0025] The front wall of the sleeve 1 is limited by the fastener 4, the movable rod 5 is movable on the inner side of the sleeve 1, the fastener 4 moves by rotating on the front wall of the sleeve 1, the fastener 4 abuts against the front wall of the movable rod 5, the fastener 4 fastens the movable rod 5, ensuring the stability of the movable rod 5, the movable rod 5 adjusts the height of the device, making it convenient for the user to adjust the tension of the thread, the bottom end of the movable rod 5 is fixedly connected with the connecting block 6, the connecting block 6 is fixedly connected with one side of the connecting plate 7, ensuring the stability of the connecting plate 7, the connecting plate 7 is fixed with one side of the connecting rod 8, ensuring the stability of the connecting rod 8, the connecting rod 9 is fixed with the outer side of the fixed plate 9, and the connecting rod 8 supports the outer side of the pulley 10, the outer surface of the pulley 10 is relatively smooth, preventing excessive friction and causing damage to the thread.

[0026] The outer side of the threaded rod 12 is movably installed with an internal thread ring 14 through threads, the outer side of the internal thread ring 14 is installed with an assembly plate 15, one side of the assembly plate 15 is installed with a elastic rod 16, one end of the elastic rod 16 is installed with a movable clamp plate 18, the movable clamp plate 18 is sleeved on the outer side of the pulley 10, one end of the connecting rod 8 is installed with a sliding rail 19, the outer wall of the elastic rod 16 is installed with a guide 17, and the guide 17 is movable on the outer side of the sliding rail 19.

[0027] One end of the connecting rod 8 is provided with a movable slot, the movable slot limits the inner side of the limiting ring 11, ensuring the stable rotation of the limiting ring 11, the user holds the handle 13 to drive the threaded rod 12 to rotate, the outer side of the threaded rod 12 drives the internal thread ring 14 to move through threads, the internal thread ring 14 drives the assembly plate 15 to move, the assembly plate 15 fixes the elastic rod 16, one end of the elastic rod 16 is connected with the movable clamp plate 18, the movable clamp plate 18 is sleeved on the outer side of the pulley 10, making it convenient to adjust the position of the movable clamp plate 18, the movable clamp plate 18 and the fixed plate 9 limit the thread, making it convenient for the thread to be transmitted, and the elastic rod 16 fixes the outer wall of the guide 17, and the guide 17 is movable on the outer side of the sliding rail 19, ensuring the stable adjustment of the position of the movable clamp plate 18.

[0028] The top end of the sleeve 1 is provided with a mounting plate 2, the inner side of the mounting plate 2 is provided with a mounting screw 3, and the mounting screw 3 is located on the outer side of the sleeve 1;

[0029] The top end of the sleeve 1 is fixedly connected with the mounting plate 2, the mounting plate 2 limits the inner side mounting screw 3, and the mounting plate 2 is mounted on the flat sewing machine through the mounting screw 3, so that the user can conveniently mount the mounting plate 2.

[0030] The top end of the sleeve 1 is fixedly connected with the mounting plate 2, the mounting plate 2 limits the inner side mounting screw 3, and the mounting plate 2 is mounted on the flat sewing machine through the mounting screw 3, so that the user can conveniently mount the mounting plate 2. The movable rod 5 moves in the inner side of the sleeve 1, the fastener 4 rotates and moves on the front wall of the sleeve 1, the fastener 4 is abutted on the front wall of the movable rod 5, the fastener 4 fastens the movable rod 5, the stability of the movable rod 5 is ensured, the movable rod 5 adjusts the height of the device, the user can conveniently adjust the tension of the thread, the bottom end of the movable rod 5 is fixedly connected with the connecting block 6, the connecting block 6 is fixedly connected with the one side connecting plate 7, the stability of the connecting plate 7 is ensured, the connecting plate 7 is fixed with the one side connecting rod 8, the stability of the connecting rod 8 is ensured, the connecting rod 9 is fixed with the outer side fixed plate 9, the connecting rod 8 supports the outer side pulley 10, the outer surface of the pulley 10 is relatively smooth, so that the thread is prevented from being damaged due to excessive friction, the user holds the handle 13 to drive the threaded rod 12 to rotate, the outer side of the threaded rod 12 drives the inner threaded ring 14 to move through the thread, the inner threaded ring 14 drives the assembled plate 15 to move, the assembled plate 15 is fixed with the elastic rod 16, one end of the elastic rod 16 is connected with the movable clamping plate 18, the movable clamping plate 18 is sleeved on the outer side of the pulley 10, so that the position of the movable clamping plate 18 is conveniently adjusted, the movable clamping plate 18 and the fixed plate 9 limit the thread, so that the thread is conveniently transmitted, the elastic rod 16 is fixed with the outer wall guide 17, the guide 17 moves on the outer side of the sliding rail 19, and the position of the movable clamping plate 18 is stably adjusted.

[0031] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the foregoing description, and all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A thread tensioning device for a flat sewing machine, characterized in that, Includes: a sleeve (1), a fastener (4) is installed through the front wall of the sleeve (1), a movable rod (5) is movably installed on the inner side of the sleeve (1), the rear end of the fastener (4) abuts against the front wall of the movable rod (5), a connecting block (6) is installed at the bottom end of the movable rod (5), a connecting plate (7) is installed on one side of the connecting block (6), a connecting rod (8) is installed on one side of the connecting plate (7), a fixing plate (9) is installed on the outer side of the connecting rod (8), a pulley (10) is installed on the outer side of the connecting rod (8), a movable groove is opened on the inner side of one end of the connecting rod (8), a limiting ring (11) is movably installed on the inner side of the movable groove, a threaded rod (12) is installed on the inner side of the limiting ring (11), and a handle (13) is installed at one end of the threaded rod (12).

2. The thread tensioning device for a flat sewing machine according to claim 1, characterized in that: An internal threaded ring (14) is movably mounted on the outside of the threaded rod (12) via a thread, and an assembly plate (15) is mounted on the outside of the internal threaded ring (14).

3. A thread tensioning device for a flat sewing machine according to claim 2, characterized in that: A spring rod (16) is installed on one side of the assembly plate (15), and a movable clamp (18) is installed at one end of the spring rod (16). The movable clamp (18) is sleeved on the outside of the pulley (10).

4. A thread tensioning device for a flat sewing machine according to claim 1, characterized in that: A slide rail (19) is installed on the outer wall of one end of the connecting rod (8).

5. A thread tensioning device for a flat sewing machine according to claim 3, characterized in that: The outer wall of the elastic rod (16) is fitted with a guide (17), which moves on the outside of the slide rail (19).

6. A thread tensioning device for a flat sewing machine according to claim 1, characterized in that: The top end of the sleeve (1) is fitted with an mounting plate (2).

7. A thread tensioning device for a flat sewing machine according to claim 6, characterized in that: An installation screw (3) is installed through the inner side of the mounting plate (2), and the installation screw (3) is located on the outer side of the sleeve (1).

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