Terminal crimping machine

Abstract

The present disclosure relates to the technical field of cable terminal crimping, and in particular to a terminal crimping machine, comprising: a crimping seat, wherein the crimping seat has a crimping cavity that is arranged through in a straight line direction, and a wire release opening is provided on the side wall of the crimping seat; a first crimping assembly, comprising a first crimping head and a first driving mechanism, wherein the first crimping head extends into the crimping cavity and is movably arranged in a direction close to or away from the wire release opening; a second crimping assembly, comprising a second crimping head and a second driving mechanism, wherein the second crimping head extends into the crimping cavity and is arranged opposite to the first crimping head; wherein when the first crimping head is in a state of moving toward the wire release opening, the second crimping head drives the second crimping head to move a set distance toward the wire release opening to reduce the moving distance of the first crimping head. The present disclosure improves the wire release efficiency by providing the wire release opening on the side wall of the crimping seat; reduces the moving stroke of the first crimping head, thereby shortening the overall crimping time and improving the crimping efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of cable terminal crimping, and in particular to a terminal crimping machine. Background Art

[0002] The terminal crimping machine is a device used to connect cables with bare crimping terminals. In the specific operation, the end of the cable with the insulation layer removed is first inserted into the bare crimping terminal, and then the two are placed together on the crimping machine. The bare crimping terminal is squeezed by the crimping head to fix the bare crimping terminal on the cable.

[0003] In the related art known to the inventor, when crimping terminals for cables with larger diameters, the crimping terminals are usually arranged in a form of one moving and one static, with a crimping seat placed below and a crimping head placed above. When crimping is performed, the bare crimping terminal is fixed by extending the cable end covered with the bare crimping terminal between the crimping head and the crimping seat and then pressing the crimping head downward.

[0004] However, when implementing the above technical solution, the inventors found that in order to facilitate the placement of the bare crimping terminal between the crimping seat and the crimping head, the crimping head needs to provide a larger stroke, which leads to the problem of low crimping efficiency.

[0005] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0006] In view of at least one of the above technical problems, the present disclosure provides a terminal crimping machine, which adopts a wire release port opened on the side and uses two crimping heads to move synchronously to reduce the stroke of a single crimping head and improve the cable crimping efficiency.

[0007] According to one aspect of the present disclosure, the present disclosure provides a terminal crimping machine, comprising:

[0008] A crimping seat, wherein the crimping seat has a crimping cavity which is arranged through in a straight line direction, and a side wall of the crimping seat has a wire release opening for allowing the cable to extend into the crimping cavity;

[0009] A first crimping assembly, comprising a first crimping head and a first driving mechanism, wherein the first crimping head extends into the crimping cavity and is movably arranged in a direction close to or away from the wire release port, and the first driving mechanism is connected to the first crimping head to drive the first crimping head;

[0010] A second crimping assembly, comprising a second crimping head and a second driving mechanism, wherein the second crimping head extends into the crimping cavity and is arranged opposite to the first crimping head, and the second driving mechanism is connected to the second crimping head to drive the second crimping head;

[0011] When the first crimping head is in a state of moving toward the wire release port, the second crimping head drives the second crimping head to move a set distance toward the wire release port to reduce the moving distance of the first crimping head.

[0012] In some embodiments of the present disclosure, the first driving mechanism includes a driving motor, a screw connected to the driving motor, a nut seat engaged on the screw, a first swing rod hinged to the nut seat at one end, a second swing rod rotatably connected to the other end of the first swing rod at one end, and the other end of the second swing rod is rotatably connected to the first crimping joint;

[0013] Wherein, the first swing arm is hinged and fixed, and the hinge point is arranged at the position of the crimping seat, so that when the first swing arm swings, it drives the second swing arm to push or pull the first crimping head to move.

[0014] In some embodiments of the present disclosure, the second driving mechanism includes a slider movably arranged in a direction perpendicular to the moving direction of the second crimping head and a driving member driving the slider to approach or move away from the second crimping head;

[0015] The slider has an inclined surface, and one end of the second crimping head away from the crimping seat contacts the inclined surface. When the slider moves toward the second crimping head, the inclined surface drives the second crimping head to move toward the crimping seat.

[0016] In some embodiments of the present disclosure, a plane is connected to the end of the inclined surface, and the plane is arranged on a side of a higher point of the inclined surface.

[0017] In some embodiments of the present disclosure, a roller is provided on the second crimping head, a slide groove is provided in the slider, the inclined surface and the plane are configured to be on the side wall of the slide groove and in contact with the roller, and when the slider moves into position, the roller stays on the plane.

[0018] In some embodiments of the present disclosure, the driving member is a pneumatic cylinder, a hydraulic cylinder, or a rack and pinion structure.

[0019] In some embodiments of the present disclosure, the first crimping joint and the second crimping joint are hexagonal crimping structures.

[0020] In some embodiments of the present disclosure, the hexagonal crimping structure includes a first crimping knife, a second crimping knife, and a third crimping knife that are sequentially abutted on the first crimping head, and a fourth crimping knife, a fifth crimping knife, and a sixth crimping knife that are sequentially abutted on the second crimping head;

[0021] The included angle between the crimping surfaces of two adjacent crimping knives is 120 degrees, and at least four crimping knives are slidably arranged along their adjacent crimping surfaces to achieve the change of the size of the hexagonal crimping interface.

[0022] In some embodiments of the present disclosure, the second pressing knife and the fifth pressing knife are located in the middle position in a direction perpendicular to the crimping direction of the pressing head, and a top block is connected to the back of the crimping surface of the second pressing knife and the fifth pressing knife, and the top block is arranged to abut against the force position of the second pressing knife and the fifth pressing knife when they are crimped.

[0023] In some embodiments of the present disclosure, a sliding rod is provided on the top block, and the second pressing knife and the fifth pressing knife are slidably connected to the sliding rod through a connecting piece, and the direction of the sliding rod is set parallel to the moving direction of the second pressing knife and the fifth pressing knife.

[0024] The beneficial effects of the present invention are as follows: the present invention, through the arrangement of the wire release opening on the side wall of the crimping seat, allows the cable and the bare crimping terminal to be directly placed between the first crimping head and the second crimping head from the side, thereby improving the wire release efficiency; and through the manner in which the second crimping head also moves a set distance toward the first crimping head during the movement of the first crimping head toward the second crimping head, compared with the related art, the movement stroke of the first crimping head is reduced, thereby shortening the overall crimping time and improving the crimping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of the terminal crimping machine in the embodiment of the present disclosure;

[0027] Figure 2 It is a schematic structural diagram of the terminal crimping machine in the embodiment of the present disclosure after the side cover is removed from the main body;

[0028] Figure 3 In the embodiments of the present disclosure Figure 2 Structural diagram of medium crimping;

[0029] Figure 4In the embodiments of the present disclosure Figure 2 Schematic diagram of the cross-sectional structure in;

[0030] Figure 5 In the embodiments of the present disclosure Figure 4 A local enlarged view of point A in FIG.

[0031] Figure 6 It is a partial structural schematic diagram of the first crimping joint and the second crimping joint in the embodiment of the present disclosure;

[0032] Figure 7 In the embodiments of the present disclosure Figure 6 Schematic diagram of the cross-sectional structure in;

[0033] Figure 8 It is a structural schematic diagram of the hexagonal crimping structure during crimping in the embodiment of the present disclosure;

[0034] Fig. 9 This is a schematic diagram of the connection structure of the top block in the embodiment of the present disclosure;

[0035] Fig.10 It is a schematic diagram of the three-dimensional structure of the second crimping head in the embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present disclosure. The terms used in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0039] In the embodiment of the present disclosure, by adopting a method in which the second crimping head moves a set distance toward the first crimping head during the crimping process of the first crimping head, the moving stroke of the first crimping head is reduced, and at the same time, the placement space of the bare crimping terminal is increased before crimping. In addition, by re-adjusting the wire release opening on the side of the crimping seat, the present disclosure improves the convenience of wire release. Compared with the related art, it not only shortens the wire release time and reduces the difficulty of wire release, but also reduces the moving stroke of the crimping head during cable crimping, reduces the crimping time, and thus improves the overall crimping efficiency. The following part of the present disclosure describes in detail an embodiment of a terminal crimping machine with the inventive concept;

[0040] like Figures 1 to 5 The terminal crimping machine shown includes a crimping seat 10, a first crimping assembly 20 and a second crimping assembly 30, wherein:

[0041] The crimping seat 10 has a crimping cavity 11 that is arranged to pass through in a straight line direction, and the side wall of the crimping seat 10 has a wire release port 12 for the cable to extend into the crimping cavity 11; it should be pointed out here that in the embodiment of the present disclosure, the crimping seat 10 functions to provide a crimping space and to limit the moving direction of the first crimping head 21 and the second crimping head 31 described below, so as to ensure that the crimping directions are arranged relative to each other, so as to improve the crimping effect; the wire release port 12 here is as shown in FIG. Figure 2 As shown in the figure, it is arranged at the position where the first crimping head 21 and the second crimping head 31 are connected, and the wire release port 12 is connected to the internal crimping cavity 11; when placing the cable, the cable with the bare crimping terminal is placed from the wire release port 12 into the crimping cavity 11 from the side by hand or by clamping the mechanical arm, which improves the convenience and efficiency of wire release compared with the related art;

[0042] The first crimping assembly 20 includes a first crimping head 21 and a first driving mechanism 22. The first crimping head 21 extends into the crimping cavity 11 and is movably arranged in a direction close to or away from the wire release port 12. The first driving mechanism 22 is connected to the first crimping head 21 to drive the first crimping head 21. In some embodiments of the present disclosure, the first driving mechanism 22 has various forms, such as a hydraulic cylinder, a pneumatic cylinder, or a motor screw structure, etc., and its function is to drive the first crimping head 21 to reciprocate in the crimping cavity 11. The second driving mechanism 32 described below can select any one of the above-mentioned driving forms in some embodiments.

[0043] The second crimping assembly 30 includes a second crimping head 31 and a second driving mechanism 32. The second crimping head 31 extends into the crimping cavity 11 and is arranged opposite to the first crimping head 21. The second driving mechanism 32 is connected to the second crimping head 31 to drive the second crimping head 31. It should be noted that in the embodiment of the present disclosure, when the first crimping head 21 and the second crimping head 31 are butt-jointed, the bare crimping terminal in the middle is squeezed, so that the bare crimping terminal is plastically deformed and then reliably fixed to the cable.

[0044] like Figure 3 As shown in , in the embodiment of the present disclosure, when the first crimping head 21 is in a state of moving toward the wire release port 12, the second crimping head 31 drives the second crimping head 31 to move a set distance toward the wire release port 12 to reduce the moving distance of the first crimping head 21. It should be pointed out here that in the embodiment of the present disclosure, the first crimping head 21 is an active crimping force application end, and the second crimping head 31 is only driven by a set distance when the first crimping head 21 moves toward the wire release port 12, and stops after being driven to a set position. During the crimping process, the second crimping head 31 only bears pressure and does not actively apply pressure, which can facilitate the controllability of the deformation of the bare crimped terminal;

[0045] In the above embodiment, by setting the wire release opening 12 on the side wall of the crimping seat 10, the cable and the bare crimping terminal can be directly placed between the first crimping head 21 and the second crimping head 31 from the side, thereby improving the wire release efficiency; and by moving the second crimping head 31 toward the first crimping head 21 by a set distance during the movement of the first crimping head 21 toward the second crimping head 31, compared with the related art, the moving stroke of the first crimping head 21 is reduced, thereby shortening the overall crimping time and improving the crimping efficiency.

[0046] Based on the above embodiments, Figures 2 to 4 As shown in , in order to further improve the reliability of the pressure application of the first crimping head 21, in the embodiment of the present disclosure, a lever structure is used to realize the force application to the first crimping head 21. Specifically, the first driving mechanism 22 includes a driving motor 22a, a screw connected to the driving motor 22a, a nut seat 22b engaged on the screw, a first swing rod 22c hinged to the nut seat 22b at one end, and a second swing rod 22d rotatably connected to the other end of the first swing rod 22c at one end, and the other end of the second swing rod 22d is rotatably connected to the first crimping head 21;

[0047] Please continue to refer to Figures 2 to 4In one embodiment of the present disclosure, the first swing rod 22c is hinged and fixed, and the hinge point is set at the position of the crimping seat 10, so that when the first swing rod 22c swings, it drives the second swing rod 22d to push or pull the first crimping joint 21 to move. Through the above arrangement, the hinge point of the first swing rod 22c is close to the crimping seat 10, so that the force arm of the first swing rod 22c when driven by the screw rod is longer, so as to reduce the torque when the screw rod is driven, and thus the durability of the dead screw rod can be ensured; of course, it should be pointed out here that in the embodiment of the present disclosure, when the first swing rod 22c is connected to the nut seat 22b, it is connected through a straight hole to ensure that the difference between the arc of the rotation point of the first swing rod 22c when it swings and the straight line of the screw rod does not affect the linear reciprocating movement of the nut seat 22b; through the above lever setting, when the same crimping force is applied to the first crimping joint 21, the motor screw rod is subjected to a smaller force, thereby improving the durability of the motor screw rod;

[0048] In the embodiment of the present disclosure, an implementation of the second driving mechanism 32 is as follows: Figure 2 As shown in the figure, the second driving mechanism 32 includes a slider 32a movably arranged in a direction perpendicular to the moving direction of the second crimping head 31 and a driving member 32b driving the slider 32a to approach or move away from the second crimping head 31; wherein, the slider 32a has an inclined surface 32a1, and the end of the second crimping head 31 away from the crimping seat 10 is in contact with the inclined surface 32a1, and when the slider 32a moves in the direction close to the second crimping head 31, the inclined surface 32a1 drives the second crimping head 31 to move toward the crimping seat 10.

[0049] It should be pointed out here that the inclined surface 32a1 on the slider 32a is used to drive the second crimping head 31. By transferring the lateral force into the vertical force, the direct force exerted by the second crimping terminal on the driving member 32b is reduced, and the service life of the driving member 32b can be improved.

[0050] Further, in the embodiments of the present disclosure, if Figure 5 As shown in , the end of the inclined surface 32a1 is connected to a plane, and the plane is set on the side of the higher point of the inclined surface 32a1. In this way, by setting the plane, when the slider 32a moves to the right position, the bottom of the second crimping head 31 contacts the plane, further enhancing the stability of the second crimping head 31 when subjected to force;

[0051] On the basis of the above-mentioned embodiment, in order to improve and reduce the friction force of the second crimping head 31 when it is rising, in the embodiment of the present disclosure, as Figure 3 and Figure 5As shown in , the second crimping head 31 has a roller 31o, the slider 32a has a slide groove 32a3, the inclined surface 32a1 and the plane are configured to be on the side wall of the slide groove 32a3 and in contact with the roller 31o, and when the slider 32a moves forward to the right position, the roller 31o stays on the plane. By setting the roller 31o, rolling friction replaces sliding friction, reducing friction, and by limiting the slide groove 32a3, the shaking of the roller 31o in other directions is reduced, providing a basis for the reliable force of the second crimping head 31.

[0052] In the embodiment of the present disclosure, there are various forms of the driving member 32b for driving the slider 32a to move forward and backward, for example, the driving member 32b is a pneumatic cylinder, a hydraulic cylinder, or a gear rack structure. In addition, it should be pointed out that in the embodiment of the present disclosure, the first crimping head 21 and the second crimping head 31 have various forms, which can be fixed V-shaped crimping heads or arc-shaped crimping heads, but the crimping structure form using the above-mentioned inventive concept structure falls within the protection scope of the present disclosure.

[0053] In one embodiment of the present disclosure, the first crimping head 21 and the second crimping head 31 are hexagonal crimping structures.

[0054] Specifically, the hexagonal crimping structure is a mold-changing free hexagonal crimping structure, such as Figure 6 and Figure 7 As shown in , the hexagonal crimping structure includes a first crimping knife 21a, a second crimping knife 21b and a third crimping knife 21c which are sequentially abutted on the first crimping head 21, and a fourth crimping knife 31a, a fifth crimping knife 31b and a sixth crimping knife 31c which are sequentially abutted on the second crimping head 31;

[0055] The angle between the crimping surfaces of two adjacent crimping knives is 120 degrees, and at least four crimping knives are slidably arranged along their adjacent crimping surfaces to achieve the change of the size of the hexagonal crimping interface. The specific structure and connection method of the mold-free hexagonal crimping structure have been disclosed in the applicant's prior application, and will not be described in detail here. When crimping, please refer to Figure 7 and Figure 8 , through the movable setting of the first pressing knife 21a, the second pressing knife 21b, the sixth pressing knife 31c and the fifth pressing knife 31b, the side length of the hexagonal pressing interface is gradually reduced, so as to achieve full force on the surrounding side of the bare crimping terminal to ensure the crimping effect; after the crimping is completed, the spring (not shown in the figure) set inside the first pressing knife 21a, the second pressing knife 21b, the fifth pressing knife 31b and the sixth pressing knife 31c is used to reset the pressing knife to facilitate the next crimping;

[0056] In the embodiments of the present disclosure, Figure 7 and Figure 8As shown in FIG. 1 , the second pressing blade 21 b and the fifth pressing blade 31 b in the middle position are before improvement (refer to FIG. 1 ). Figure 7 and Figure 8 The first crimping head 21 is hollow, so that during long-term crimping, the second crimping blade 21b and the fifth crimping blade 31b will be deformed, which will eventually cause the crimping blades to be unable to move and cause damage. In order to solve the above problem, in the embodiment of the present disclosure, Figure 7 and Figure 8 As shown in the figure, the second pressing blade 21b and the fifth pressing blade 31b are in the middle position in the direction perpendicular to the pressing direction of the pressing head, and the back of the pressing surface of the second pressing blade 21b and the fifth pressing blade 31b are connected with a top block 31d, and the top block 31d is set against the force position of the second pressing blade 21b and the fifth pressing blade 31b when they are pressed. In this way, through the setting of the top block 31d, when the second pressing blade 21b and the fifth pressing blade 31b are subjected to force, the top block 31d transmits the force, thereby preventing the deformation of the second pressing blade 21b and the fifth pressing blade 31b, and improving the durability of the pressing blade;

[0057] Based on the above embodiments, Fig. 9 As shown in, in order to reduce the resistance of the top block 31d when the second pressing knife 21b and the fifth pressing knife 31b move, in the embodiment of the present disclosure, a slide bar 31d1 is provided on the top block 31d, and the second pressing knife 21b and the fifth pressing knife 31b are both slidably connected to the slide bar 31d1 through a connecting member 31b1, and the direction of the slide bar 31d1 is set parallel to the moving direction of the second pressing knife 21b and the fifth pressing knife 31b. The connecting member 31b1 can be a linear bearing or a connecting sleeve sleeved on the slide bar 31d1. The above-mentioned arrangement further improves the reliability of the pressing knife when it moves;

[0058] In addition, if Fig.10 As shown in, in the embodiment of the present disclosure, in order to further prevent the displacement of the top block 31d, a limiting groove 31c1 is provided on the sixth pressing knife 31c and the first pressing knife 21a, so that the top block 31d is in the limiting groove 31c1, so that when the second pressing knife 21b or the fifth pressing knife 31b moves, the top block 31d is restricted by the limiting groove 31c1 to prevent the top block 31d from being displaced in its thickness direction, thereby improving the reliability of the crimping.

[0059] Those skilled in the art should understand that the present disclosure is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present disclosure. Without departing from the spirit and scope of the present disclosure, the present disclosure may be subject to various changes and improvements, which are within the scope of the present disclosure to be protected. The scope of protection claimed by the present disclosure is defined by the attached claims and their equivalents.

Claims

1. A terminal crimping machine, characterized in that: include: A crimping seat, wherein the crimping seat has a crimping cavity which is arranged through in a straight line direction, and a wire release opening is provided on a side wall of the crimping seat, wherein the wire release opening is used for allowing the cable to extend into the crimping cavity; A first crimping assembly, comprising a first crimping head and a first driving mechanism, wherein the first crimping head extends into the crimping cavity and is movably arranged in a direction close to or away from the wire release port, and the first driving mechanism is connected to the first crimping head to drive the first crimping head; A second crimping assembly, comprising a second crimping head and a second driving mechanism, wherein the second crimping head extends into the crimping cavity and is arranged opposite to the first crimping head, and the second driving mechanism is connected to the second crimping head to drive the second crimping head; Wherein, when the first crimping head is in a state of moving toward the wire release port, the second driving mechanism drives the second crimping head to move a set distance toward the wire release port to reduce the moving distance of the first crimping head; The first driving mechanism comprises a driving motor, a screw connected to the driving motor, a nut seat engaged on the screw, a first swing rod hinged to the nut seat at one end, a second swing rod rotatably connected to the other end of the first swing rod at one end, and the other end of the second swing rod is rotatably connected to the first crimping head; Wherein, the first swing rod is hinged and fixed, and the hinge point is set at the position of the crimping seat, so that when the first swing rod swings, it drives the second swing rod to push or pull the first crimping head to move; The second driving mechanism comprises a slider movably arranged in a direction perpendicular to the moving direction of the second crimping head and a driving member driving the slider to approach or move away from the second crimping head; The slider has an inclined surface, and one end of the second crimping head away from the crimping seat contacts the inclined surface. When the slider moves toward the second crimping head, the inclined surface drives the second crimping head to move toward the crimping seat.

2. The terminal crimping machine according to claim 1, characterized in that: The end of the inclined surface is connected with a plane, and the plane is arranged on one side of the higher point of the inclined surface.

3. The terminal crimping machine according to claim 2, characterized in that: The second crimping head is provided with a roller, the slider is provided with a slide groove, the inclined surface and the plane are configured to be on the side wall of the slide groove and in contact with the roller, and when the slider moves forward to a position, the roller stays on the plane.

4. The terminal crimping machine according to claim 1, characterized in that: The driving member is a pneumatic cylinder, a hydraulic cylinder, or a gear rack structure.

5. The terminal crimping machine according to claim 1, characterized in that: The first crimping joint and the second crimping joint are hexagonal crimping structures.

6. The terminal crimping machine according to claim 5, characterized in that: The hexagonal crimping structure comprises a first crimping knife, a second crimping knife and a third crimping knife which are arranged on the first crimping head and abutted in sequence, and a fourth crimping knife, a fifth crimping knife and a sixth crimping knife which are arranged on the second crimping head and abutted in sequence; The included angle between the crimping surfaces of two adjacent crimping knives is 120 degrees, and at least four crimping knives are slidably arranged along their adjacent crimping surfaces to achieve the change of the size of the hexagonal crimping interface.

7. The terminal crimping machine according to claim 6, characterized in that: The second pressing knife and the fifth pressing knife are located in the middle position in a direction perpendicular to the crimping direction of the pressing head, and a top block is connected to the back of the crimping surface of the second pressing knife and the fifth pressing knife, and the top block is set to abut against the force position of the second pressing knife and the fifth pressing knife when they are crimped.

8. The terminal crimping machine according to claim 7, characterized in that: The top block is provided with a slide bar, the second pressing knife and the fifth pressing knife are both slidably connected to the slide bar through a connecting piece, and the direction of the slide bar is arranged parallel to the moving direction of the second pressing knife and the fifth pressing knife.

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