Cloth strip shearing device

Abstract

The utility model provides a cloth strip shearing device. The cloth strip shearing device comprises a fixed cutter holder which is fixedly arranged and provided with a fixed cutter. The movable knife rest is movably arranged relative to the fixed knife holder and is provided with a movable knife; the cutting edge of the movable cutter and the cutting edge of the fixed cutter are coplanar; when the movable knife rest moves towards the fixed knife holder, the cutting edge of the movable knife and the cutting edge of the fixed knife are close to each other and gradually coincide, and therefore materials are cut off. The crank abuts against the movable knife rest, and when the crank rotates, the movable knife rest is driven to move. According to the utility model, the movable knife rest driven by the crank to operate is matched with the stationary knife to cut off cloth strips, which belongs to mechanical cutting, and the cloth does not need to be fused in an electric heating mode, so that the safety risk does not exist, and the safety is higher.

Description

Technical Field

[0001] The utility model relates to the field of sewing equipment, in particular to a cloth strip cutting device. Background Art

[0002] Among the various sewing techniques, there is a type of machine used for the hemming needs of clothing or other fabric products, generally called an overlocking machine or an overlocking machine. Usually, a certain width of cloth strips are needed to wrap the exposed edges of the fabric to prevent the fabric from snagging, unthreading, and pilling. High-end overlocking machines may also be equipped with a cutting or cutting device for the fabric strips used for hemming to achieve the cutting of the overlocking fabric strips.

[0003] The existing utility model patent with publication number CN218491960U, titled "Sewing machine with automatic cloth cutting function", and the utility model patent with publication number CN210975103U, titled "A kind of automatic webbing hemming device", both provide the cloth cutting device used in the hemming machine mentioned in the above background technology. The cloth cutting devices used in them all use electric heating to fuse the cloth strips used. Similar technologies can indeed achieve cloth cutting or cutting, but because electric heating devices are used, and materials such as cloth in sewing operations are flammable items, it is generally believed that this poses a safety hazard to a certain extent, and other alternatives need to be found. Utility Model Content

[0004] In view of the problem of potential safety hazards in the cloth strip cutting device based on electric thermal fusing in the prior art, the utility model provides a cloth strip cutting device with a different working principle.

[0005] The utility model provides a cloth strip cutting device, comprising

[0006] A fixed knife seat, which is fixed and has a fixed knife;

[0007] The movable knife holder is movably arranged relative to the fixed knife seat, and has a movable knife; the cutting edge of the movable knife is coplanar with the cutting edge of the fixed knife; when the movable knife holder moves toward the fixed knife seat, the cutting edge of the movable knife approaches and gradually overlaps with the cutting edge of the fixed knife, thereby shearing the material;

[0008] A crank is abutted against the movable tool holder, and when the crank rotates, the movable tool holder is driven to move.

[0009] Preferably, the movable tool holder is connected to the fixed tool seat via an elastic component, and the elastic component is used for movement resetting of the movable tool holder.

[0010] Preferably, the elastic component is an elastic member disposed on both sides of the crank.

[0011] Preferably, the movable knife holder has a guide assembly, and the guide assembly slides in a limited space on the fixed knife to guide the movable knife holder.

[0012] Preferably, the guide assembly is provided with a through long slot along the moving direction, and the rotating shaft of the crank passes through the long slot.

[0013] Preferably, the movable knife is mounted on a knife seat of the movable knife holder, and the movable knife holder has a second elastic member, and the second elastic member floats and fixes the movable knife on the knife seat.

[0014] Preferably, the movable knife holder further has a limiting member; the limiting member is fixed on the knife seat, and the movable knife has a limiting groove adapted to the limiting member, or the limiting member is fixed on the movable knife, and the knife seat has a limiting groove adapted to the limiting member;

[0015] The limiting member and the limiting groove can move freely along the floating direction, and the limiting member and the limiting groove limit the freedom of movement of the movable tool holder along at least one direction at least in a plane perpendicular to the floating direction.

[0016] Preferably, a stopper is provided on the fixed knife, and the movable knife moves against the stopper to ensure that the cutting edge of the movable knife is coplanar with the cutting edge of the fixed knife;

[0017] or,

[0018] A stopper is arranged on the movable knife, and the fixed knife moves close to the stopper to ensure that the cutting edge of the movable knife is coplanar with the cutting edge of the fixed knife.

[0019] Preferably, the cutting edge of the movable knife and the cutting edge of the fixed knife are arranged at an angle α, and the angle α does not exceed 30 degrees.

[0020] The utility model can realize the cutting operation of the cloth strip by cooperating with the movable knife holder driven by the crank and the stationary fixed knife. This is a mechanical cutting and does not need to fuse the cloth by electric heating. Therefore, there is no safety risk and it has higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the installation of the cloth strip cutting device of the utility model;

[0022] Figure 2 It is an overall schematic diagram of the cloth strip cutting device of the utility model;

[0023] Figure 3 It is a partial schematic diagram of the movable knife 121 and the fixed knife 111 in the utility model;

[0024] Figure 4 It is a schematic diagram of the installation of the guide assembly 124 in the present invention.

[0025] In the figure:

[0026] 1: cloth strip cutting device; 11: fixed knife seat; 12: moving knife holder; 13: crank; 111: fixed knife; 112: stopper; 121: moving knife; 122: elastic component; 123: elastic member; 124: guide component; 125: long groove; 126: knife seat; 127: second elastic member; 128: limiting member; 129: limiting groove; 131: rotating shaft; W: sewing machine; W1: cloth strip. DETAILED DESCRIPTION

[0027] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. In this specification, the size ratios in the drawings do not represent the actual size ratios, but are only used to reflect the relative position relationship and connection relationship between the components. Components with the same name or the same number represent similar or identical structures and are only for illustrative purposes.

[0028] Figure 1 The figure is a schematic diagram of the installation of the cloth strip cutting device of the utility model. The cloth strip cutting device 1 is generally arranged in the middle space of the sewing machine W, close to the machine head. The cloth strip W1 is sent out from the cloth strip cutting device, passes through the presser foot of the machine head and completes sewing. When the hemming process and the like are completed, it is only necessary to start the switch to activate the cloth strip cutting device 1, and the cloth strip W1 can be cut, so as to realize the operations such as cloth strip cutting in the sewing process. The sewing process here can particularly refer to sewing operations such as hemming.

[0029] The overall schematic diagram of the cloth strip cutting device of the utility model which does not use the heating and fusing method is as follows Figure 2 As shown, the cloth strip cutting device 1 includes a fixed knife seat 1, which constitutes the main body of the cloth strip cutting device 1 and is generally fixed at an installation position, such as the middle gap of a sewing machine and basically aligned with the head of the machine to feed the cloth strip to the head of the machine. The cloth strip cutting device 1 also includes a movable knife holder 12 and a crank 13. A fixed knife 111 is arranged on the fixed knife seat 11, and a movable knife 121 is arranged on the movable knife holder 12. The movable knife holder 12 is arranged on the fixed knife seat 11 to move in a controlled manner so that the movable knife 121 and the fixed knife 111 are moved away from or close to each other accordingly. Figure 3As shown, when the movable knife holder 12 moves, the movable knife 121 moves against the fixed knife 111, and the cutting edges of the two are almost located in the same plane. As the overlapping part of the cutting edges advances during the movement, the cloth strip W1 is cut. In order to ensure the overlap of the cutting edges, a stopper 112 is provided between the fixed knife 111 and the movable knife 121. The stopper 112 is used to ensure the relative position of the cutting edges of the fixed knife 111 and the stopper 12. The stopper 112 can be provided on the fixed knife 111. As shown in the figure, the movable knife 121 is against the stopper 112, which naturally ensures that the cutting edge of the movable knife 121 overlaps with the cutting edge projection of the fixed knife 111. Conversely, it is also possible to provide the stopper 112 on the movable knife 121. Preferably, the cutting edge between the movable knife 121 and the fixed knife 111 can be set at an angle α, so that the contact point of the cutting edges between the movable knife 121 and the fixed knife 111 is gradually advanced in the process of the movable knife holder 12 approaching the fixed knife seat 11 to form a better shearing effect. The angle α is set within about 30 degrees. If the angle is too large, it will be detrimental to the force applied to the cloth strip W1 when it is cut and may cause the problem of insufficient travel.

[0030] In order to realize the moving operation of the moving knife holder 12, the moving knife holder 12 can be slidably arranged on the fixed knife seat 11, and is connected to the fixed knife seat 11 through an elastic component 122. The elastic component 122 is pre-tightened, so no matter where the moving knife holder 12 is on the moving route, it can always return to the initial height when the external force is lost, so that the moving channel of the cloth strip W1 between the fixed knife 111 and the moving knife 121 is opened. The crank 13 is driven by the driving component to rotate around the axis, and the crank abuts the moving knife holder 12 at the same time, and the crank provides the driving force for the moving knife holder 12 to move. In other words, when the crank abuts the moving knife holder 12 to rotate, the moving knife holder 12 is forced to overcome the restriction of the elastic component 122 and cut the cloth strip W1.

[0031] In order to balance the force, the elastic component 122 is preferably an elastic member 123, such as a spring, disposed on both sides of the crank 13. The stable movement of the movable knife 12 along the predetermined direction is achieved by the guide component 124. Figure 4As shown, the guide assembly 124 slides in the limited space on the fixed knife seat 11 to ensure the stability of the moving posture of the moving knife holder 12, in order to provide a longer guide stroke, but at the same time, the guide assembly 124 does not interfere with other components, such as the rotating shaft 131 of the driving crank 13 in the figure. A through long groove 125 is opened on the guide assembly 124 in the moving direction, and the rotating shaft passes through the long groove, and even so, when the moving knife holder 12 moves, the rotating shaft does not interfere with the moving knife holder 12. Such a layout also makes the cloth cutting device 1 more compact as a whole, facilitates the installation of the cloth cutting device 1 in the space in the middle of the sewing machine, and ensures that even if the moving knife holder 12 has a movement stroke, its range of movement will not interfere with the sewing machine. In short, under normal circumstances, the height of the middle space of the sewing machine is limited, generally not higher than 110mm, so the cloth cutting device 1 as a whole also needs to meet the installation space requirement of 110mm when the moving knife holder 12 moves to the highest point. The above arrangement is beneficial to ensure the stable guidance of the movable tool holder 12 while ensuring the installation size of the device and avoiding movement interference.

[0032] The movable knife 121 on the movable knife holder 12 is installed on the knife seat 126 of the movable knife holder 12. The movable knife 121 is set on the knife seat 126 through the second elastic member 127. The pre-tightened second elastic member 127 makes the movable knife 121 float and fix on the knife seat 126. This is necessary. The floating direction of the movable knife 121 generally has a component pointing to the fixed knife 111, or directly facing the surface of the fixed knife 111 as shown in the figure, so the second elastic member 127 can make the movable knife 121 always close to the fixed knife 111, that is, to ensure that the projections of the blades of the fixed knife 111 and the blades of the movable knife 121 are almost overlapped in the same plane, which can ensure the success rate of cutting and prevent the occasional adhesion of the cloth strip W1. When the movable knife 121 is set in a floating manner, it may also cause the problem of unstable posture and deflection of the movable knife 121 when it moves. This is achieved by adding a limiter 128 between the movable knife 121 and the knife seat 126. The stopper 128 is fixed on the knife seat 126, and a stopper groove 129 adapted to the stopper 128 is provided on the movable knife 121. The stopper 128 and the stopper groove 129 are free to move along the floating direction, but at least in a plane perpendicular to the floating direction, the movable knife 121 is restricted from moving in at least one direction. In the normal plane, the stopper 128 and the second elastic member 127 fixed point form two points of fixation for the movable knife 121 in the plane, thereby ensuring that the movable knife 121 will not deflect in the plane. The second elastic member 127 can be a spring arranged along the axis.

[0033] The above content is only a description of the preferred implementation mode of the utility model, and does not limit the scope of the utility model. Without departing from the design spirit of the utility model, various modifications and improvements made to the technical solution of the utility model by ordinary technicians in this field should fall within the protection scope determined by the claims of the utility model.

Claims

1. A cloth strip cutting device, characterized in that: include A fixed knife seat (11), the fixed knife seat (11) is fixedly arranged and has a fixed knife (111); A movable knife holder (12), the movable knife holder (12) is movably arranged relative to the fixed knife seat (11), and comprises a movable knife (121); the cutting edge of the movable knife (121) is coplanar with the cutting edge of the fixed knife (111); when the movable knife holder (12) moves toward the fixed knife seat (11), the cutting edge of the movable knife (121) and the cutting edge of the fixed knife (111) approach and gradually overlap, thereby shearing the material; A crank (13) is provided, wherein the crank (13) abuts against the movable tool holder (12), and when the crank (13) rotates, the movable tool holder (12) is driven to move.

2. The cloth strip cutting device according to claim 1, characterized in that: The movable knife holder (12) and the fixed knife seat (11) are connected via an elastic component (122), and the elastic component (122) is used for movement resetting of the movable knife holder (12).

3. The cloth strip cutting device according to claim 2, characterized in that: The elastic component (122) is an elastic member (123) disposed on both sides of the crank (13).

4. The cloth strip cutting device according to claim 1, characterized in that: The movable knife holder (12) has a guide assembly (124), and the guide assembly (124) slides in a limited space on the fixed knife (111) to guide the movable knife holder (12).

5. The cloth strip cutting device according to claim 4, characterized in that: The guide assembly (124) is provided with a through long slot (125) along the moving direction, and the rotating shaft (131) of the crank (13) passes through the long slot (125).

6. The cloth strip cutting device according to claim 1, characterized in that: The movable knife (121) is mounted on a knife seat (126) of the movable knife holder (12); the movable knife holder (12) has a second elastic member (127); and the second elastic member (127) floats and fixes the movable knife (121) on the knife seat (126).

7. The cloth strip cutting device according to claim 6, characterized in that: The movable knife holder (12) further comprises a limiting member (128); the limiting member (128) is fixed on the knife seat (126), and the movable knife (121) comprises a limiting groove (129) adapted to the limiting member (128); or the limiting member (128) is fixed on the movable knife (121), and the knife seat (126) comprises a limiting groove (129) adapted to the limiting member (128); The limiting member (128) and the limiting groove (129) can move freely along the floating direction, and the limiting member (128) and the limiting groove (129) limit the freedom of movement of the movable tool holder (12) along at least one direction at least in a plane perpendicular to the floating direction.

8. The cloth strip cutting device according to claim 1, characterized in that: A stopper (112) is provided on the fixed knife (111), and the movable knife (121) moves close to the stopper (112) to ensure that the cutting edge of the movable knife (121) is coplanar with the cutting edge of the fixed knife (111); or, The movable knife (121) is provided with a stopper (112), and the fixed knife (111) moves against the stopper (112) to ensure that the cutting edge of the movable knife (121) is coplanar with the cutting edge of the fixed knife (111).

9. The cloth strip cutting device according to claim 1, characterized in that: The cutting edge of the movable knife (121) and the cutting edge of the fixed knife (111) are arranged at an angle α, and the angle α does not exceed 30 degrees.

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