Advertising and retreating guide plate, surface shearing mechanism and buttonholing machine

Abstract

The utility model relates to the technical field of sewing machines, in particular to an advancing and retreating guide plate, a surface shearing mechanism and a buttonholing machine. Wherein a strip-shaped sliding groove is formed in the middle of the advancing and retreating guide plate, a notch is formed in the edge of the advancing and retreating guide plate in a concave mode, the strip-shaped sliding groove can be matched with a limiting screw on the noodle shearing mechanism to achieve back-and-forth sliding of the advancing and retreating guide plate, and the notch can be matched with a feeding control piece on the noodle shearing mechanism to achieve adjustment from a to-be-sheared state to a shearing closing state. The inner side wall, close to one side of the strip-shaped sliding groove, of the notch is perpendicular to the inner bottom wall, and the inner side wall, away from one side of the strip-shaped sliding groove, of the notch is obliquely connected with the inner bottom wall at an obtuse angle. The advancing and retreating guide plate can achieve buffering through the notch, and in the process that the face shearing mechanism is changed into a closed shearing state from a to-be-sheared state, noise is lowered, and the thread clamping and shearing stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to an advance and retreat guide plate, a face shearing mechanism using the advance and retreat guide plate, and a buttonhole machine using the face shearing mechanism. Background Art

[0002] In the current whole set of noodle shearing mechanisms, for example, in a noodle thread shearing device disclosed in CN202202121U, the notch on the advance and retreat guide plate is shaped like a straight-edged groove, which results in that when the device changes from a waiting state to a closed state, because the inner side wall of the notch of the advance and retreat guide plate remains perpendicular to the inner bottom wall, when the notch of the thread shearing advance and retreat guide plate moves to the position of the feed control rod, the feed control rod will change sharply from a state of abutting against the side wall of the outer periphery of the notch to a state of abutting against the inner bottom wall of the notch under the tension of the tension spring, and the entire process does not contact the inner side wall of the notch, thereby causing the entire scissors support frame to move rapidly to the right and hit the shoulder of the feed guide rod, causing a strong and short noise, which seriously affects the customer's comfort experience; at the same time, due to the strong impact, the parts in the upper thread shear knife assembly installed on the scissors support frame will also vibrate violently, causing the originally clamped thread to detach from the scissors after being cut, and the stability of the thread clamping and thread shearing needs to be further improved.

[0003] Against the background of increasing processing efficiency in factories, the shearing speed of face shears has become faster and faster as customers demand and experience. At the same time, higher shearing speeds have exacerbated the above two problems. Therefore, it is necessary to further improve the face shearing mechanism both now and in the future. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides an advance and retreat guide plate which can reduce noise and improve the stability of the clamping and shearing line when a surface shearing mechanism changes from a waiting state to a closed state.

[0005] The utility model adopts the following technical solutions:

[0006] The utility model provides an advance and retreat guide plate, which is provided with a strip slide groove in the middle position and a notch is formed inwardly at the edge position. The strip slide groove can cooperate with a limit screw on a surface shearing mechanism to realize the back and forth sliding of the advance and retreat guide plate, and the notch can cooperate with a feed control part on the surface shearing mechanism to realize the adjustment from a waiting state to a closed state. The inner side wall of the notch close to the strip slide groove is kept perpendicular to the inner bottom wall, and the inner side wall of the notch away from the strip slide groove is connected to the inner bottom wall at an obtuse angle.

[0007] The utility model also provides a surface shearing mechanism, including a forward and backward moving driving structure, a closed shearing buffer structure, a scissors structure and a presser foot structure. The forward and backward moving driving structure is fixed on the casing of the buttonhole machine and simultaneously drives the closed shearing buffer structure and the scissors structure to move back and forth. The closed shearing buffer structure can realize the adjustment of the surface shearing mechanism from a waiting state to a closed shearing state, and the above-mentioned advance and retreat guide plate is provided in the closed shearing buffer structure, and the presser foot structure is arranged close to the scissors structure.

[0008] Preferably, the forward and backward moving driving structure includes a motor mounting plate, a slow-wire hook guide crank assembly, a wire trimming connecting crank assembly and a wire trimming bracket. The motor mounting plate is fixed on the casing of the buttonhole machine. A surface shearing motor is fixed on the motor mounting plate. A wire trimming cam assembly is vertically fixed on the motor shaft of the surface shearing motor. The slow-wire hook guide crank assembly and the wire trimming connecting crank assembly are both hinged on the motor mounting plate. The cam roller at the middle position of the slow-wire hook guide crank assembly is inserted into the cam groove on the wire trimming cam assembly. The wire trimming connecting crank assembly is installed on the wire trimming bracket, and the wire trimming bracket can deflect relative to the wire trimming connecting crank assembly. The cam roller on the lower end of the slow-wire hook guide crank assembly cooperates with the lateral moving groove on the wire trimming bracket. The closed shear buffer structure and the scissors structure are both connected to the wire trimming bracket.

[0009] Preferably, the closed shear buffer structure includes an advance and retreat fixed plate, an advance and retreat guide plate, a guide spring, a limit plate, a roller and a wire cutting spring. The advance and retreat fixed plate is installed on the wire cutting bracket. The strip slide groove on the advance and retreat guide plate cooperates with the limit screw on the advance and retreat fixed plate. The guide spring remains in a tensioned state and its two ends are respectively hooked on the limit screw of the advance and retreat fixed plate and the advance and retreat guide plate. The limit plate is fixed on the advance and retreat fixed plate and abuts against the advance and retreat guide plate away from the notch. The roller is fixed on the casing and abuts against the groove track on the advance and retreat fixed plate. The wire cutting spring remains in a tensioned state and its two ends are respectively connected to the scissors structure and the connecting plate on the casing.

[0010] Preferably, the scissors structure comprises a scissors frame and an upper thread cutting knife assembly, the scissors frame is mounted on the thread cutting bracket, and the upper thread cutting knife assembly is mounted on the scissors frame.

[0011] Preferably, the presser foot structure comprises a presser foot bracket and a closed shear plate, the closed shear plate is mounted on the presser foot bracket, and the closed shear plate is arranged close to the scissors structure.

[0012] The utility model also provides a buttonhole machine which adopts the surface shearing mechanism.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] Taking the noodle thread trimming device disclosed in CN202202121U as an example, after the advance and retreat guide plate of the utility model is installed on the complete noodle shearing mechanism, the strip slide groove cooperates with the fixed column, and the notch cooperates with the feed control rod. In the process of the noodle shearing mechanism changing from the waiting state to the closed state, as the mechanism moves forward as a whole, when the notch of the advance and retreat guide plate moves to the position of the feed control rod, under the strong pulling force of the tension spring, the scissors support frame will quickly rotate to the right, so that the feed control rod abuts against the inclined inner wall in the notch of the advance and retreat guide plate. At this time, the advance and retreat guide plate has a tendency to continue moving forward, and because of the strong pulling force of the return spring, the advance and retreat guide plate remains in a stable state.

[0015] That is to say, in the use state, the advance and retreat guide plate of the utility model abuts against the feed control rod through the inclined inner wall, and has a certain buffer amount when moving forward compared with the original advance and retreat guide plate, so that it can absorb most of the kinetic energy generated by the rapid right turn of the scissors support frame, so that the scissors support frame can contact the shoulder of the feed guide rod more gently, thereby greatly avoiding strong impact noise; at the same time, it also avoids severe vibration of the parts in the upper thread trimmer assembly installed on the scissors support frame, thereby improving the stability of thread clamping and thread cutting.

[0016] The face shearing mechanism and buttonhole machine of this embodiment both adopt the above-mentioned advance and retract guide plate, so they naturally have the beneficial effect of reducing noise and improving the stability of the clamping and shearing line when the face shearing mechanism changes from the waiting state to the closed state, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the advance and retreat guide plate in an embodiment of the utility model.

[0018] Figure 2 It is a schematic structural diagram of the surface shearing mechanism from a front view in an embodiment of the utility model.

[0019] Figure 3 It is a schematic structural diagram of the surface shearing mechanism from a back view in an embodiment of the utility model.

[0020] Figure 4 It is a top view of the dough shearing mechanism in the ready-to-cut state in the embodiment of the utility model.

[0021] Figure 5 It is a top view of the surface shearing mechanism in the closed shearing state in the embodiment of the utility model.

[0022] The reference numerals are described as follows:

[0023] 1. Advance and retreat guide plate 8. Guide spring

[0024] 101, strip chute 9, limit plate

[0025] 102, notch 10, roller

[0026] 2. Motor mounting plate 11. Wire trimmer spring

[0027] 3. Slow-line hook guide crank assembly 12. Scissor frame

[0028] 4. Thread trimmer connecting crank assembly 13. Upper thread trimmer assembly

[0029] 5. Thread trimmer bracket 14. Presser foot bracket

[0030] 6. Thread trimming cam assembly 15. Closed shear plate

[0031] 7. Advance and retreat fixing plate 16. Presser foot guide shaft assembly DETAILED DESCRIPTION

[0032] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0036] exist Figure 4 and Figure 5In the text, for the convenience of description, the front and back directions are the left and right directions of the paper in the figure, and the left and right directions are the up and down directions of the paper in the figure. Specifically, the front direction is the right direction of the paper in the figure, the rear direction is the left direction of the paper in the figure, the left direction is the downward direction of the paper in the figure, and the right direction is the upward direction of the paper in the figure.

[0037] See also Figure 1 The present embodiment provides an advance and retreat guide plate, which has a strip slide groove 101 in the middle position and a notch 102 inwardly formed at the edge position. The strip slide groove 101 can cooperate with the limit screw on the dough shearing mechanism to realize the back and forth sliding of the advance and retreat guide plate 1, and the notch 102 can cooperate with the feed control part on the dough shearing mechanism to realize the adjustment from the waiting state to the closed state. The inner side wall of the notch 102 close to the strip slide groove 101 is perpendicular to the inner bottom wall, and the inner side wall of the notch 102 away from the strip slide groove 101 is inclinedly connected to the inner bottom wall at an obtuse angle.

[0038] Taking the noodle thread trimming device disclosed in CN2022021021U as an example, after the advance and retreat guide plate 1 of this embodiment is installed on the complete noodle shearing mechanism, the strip slide groove 101 cooperates with the fixed column, and the notch 102 cooperates with the feed control rod. In the process of the noodle shearing mechanism changing from the waiting state to the closed state, as the mechanism moves forward as a whole, when the notch 102 of the advance and retreat guide plate 1 moves to the position of the feed control rod, under the strong pulling force of the tension spring, the scissors support frame will quickly rotate to the right, so that the feed control rod abuts against the inclined inner side wall in the notch 102 of the advance and retreat guide plate 1. At this time, the advance and retreat guide plate 1 has a tendency to continue moving forward, and because of the strong pulling force of the return spring, the advance and retreat guide plate 1 remains in a stable state.

[0039] That is to say, in the use state, the advance and retreat guide plate 1 of this embodiment abuts against the feed control rod through the inclined inner wall, and has a certain buffer amount when moving forward compared with the original advance and retreat guide plate, so that it can absorb most of the kinetic energy generated by the rapid right turn of the scissors support frame, so that the scissors support frame can contact the shoulder of the feed guide rod more gently, thereby greatly avoiding strong impact noise; at the same time, it also avoids severe vibration of the parts in the upper thread trimmer assembly installed on the scissors support frame, thereby improving the stability of thread clamping and thread cutting.

[0040] See also Figure 2 and Figure 3 The present embodiment also provides a face shearing mechanism, including a forward and backward moving driving structure, a closed shearing buffer structure, a scissors structure and a presser foot structure. The forward and backward moving driving structure is fixed on the casing of the buttonhole machine and simultaneously drives the closed shearing buffer structure and the scissors structure to move back and forth. The closed shearing buffer structure can realize the adjustment of the face shearing mechanism from a waiting state to a closed shearing state, and the closed shearing buffer structure is provided with the above-mentioned advance and retreat guide plate 1, and the presser foot structure is arranged close to the scissors structure.

[0041] When the face shearing mechanism is working, the forward and backward moving driving structure simultaneously drives the closed shear buffer structure and the scissors structure to move back and forth, and the closed shear buffer structure, the scissors structure and the presser foot structure cooperate to realize the functions of line cutting, presser foot and adjustment from the waiting state to the closed shear state. Since the face shearing mechanism of this embodiment adopts the above-mentioned advance and retreat guide plate 1, it can reduce noise and improve the stability of the clamping line in the process of changing from the waiting state to the closed shear state.

[0042] Preferably, see Figure 2 , Figure 4 and Figure 5 The forward and backward moving driving structure includes a motor mounting plate 2, a slow-line hook guide crank assembly 3, a wire trimming connecting crank assembly 4 and a wire trimming bracket 5. The motor mounting plate 2 is fixed on the casing of the buttonhole machine. A surface shearing motor is fixed on the motor mounting plate 2. A wire trimming cam assembly 6 is vertically fixed on the motor shaft of the surface shearing motor. The slow-line hook guide crank assembly 3 and the wire trimming connecting crank assembly 4 are both hinged on the motor mounting plate 2. The cam roller at the middle position of the slow-line hook guide crank assembly 3 is inserted into the cam slide groove on the wire trimming cam assembly 6. The wire trimming connecting crank assembly 4 is installed on the wire trimming bracket 5, and the wire trimming bracket 5 can deflect relative to the wire trimming connecting crank assembly 4. The cam roller on the lower end of the slow-line hook guide crank assembly 3 cooperates with the lateral moving groove on the wire trimming bracket 5. The closed shear buffer structure and the scissors structure are both connected to the wire trimming bracket 5.

[0043] The motor mounting plate 2 is fixed on the casing, and thus serves as the main load-bearing part of the entire dough shearing mechanism; when the dough shearing motor rotates, the cam roller at the middle position of the slow-wire hook guide crank assembly 3 slides in the cam slide groove on the thread trimming cam assembly 6, forcing the slow-wire hook guide crank assembly 3 to swing back and forth according to the slide groove track on the thread trimming cam assembly 6; and when the slow-wire hook guide crank assembly 3 swings back and forth, the thread trimming bracket 5 also follows the slow-wire hook guide crank assembly 3 and moves back and forth.

[0044] Preferably, in this embodiment, the line slowing hook guide crank assembly 3 and the line trimming connecting crank assembly 4 are both mounted on the motor mounting plate 2 via axial screws in their respective assemblies.

[0045] Preferably, see Figures 2 to 5The closed shear buffer structure includes an advance and retreat fixed plate 7, an advance and retreat guide plate 1, a guide spring 8, a limit plate 9, a roller 10 and a thread trimming spring 11. The advance and retreat fixed plate 7 is installed on the thread trimming bracket 5. The strip slide groove 101 on the advance and retreat guide plate 1 cooperates with the limit screw on the advance and retreat fixed plate 7. The guide spring 8 remains in a taut state and its two ends are respectively hooked on the limit screw of the advance and retreat fixed plate 7 and the advance and retreat guide plate 1. The limit plate 9 is fixed on the advance and retreat fixed plate 7 and abuts against the advance and retreat guide plate 1 away from the notch 102. The roller 10 is fixed on the casing and abuts against the groove track on the advance and retreat fixed plate 7. The thread trimming spring 11 remains in a taut state and its two ends are respectively connected to the scissors structure and the connecting plate on the casing.

[0046] Among them, the guide spring 8 is used to realize the automatic return of the advance and retreat guide plate 1, and the limit plate 9 is used to limit the position of the advance and retreat fixed plate 7. The thread cutting spring 11 is used to force the scissors structure to move left and right regularly according to the predetermined trajectory on the advance and retreat fixed plate 7 and the reaction of the roller 10 as the shears are opened and closed.

[0047] Preferably, see Figure 2 and Figure 3 The scissors structure includes a scissors frame 12 and an upper thread cutting knife assembly 13. The scissors frame 12 is mounted on the thread cutting bracket 5, and the upper thread cutting knife assembly 13 is mounted on the scissors frame 12. As a conventional component, the upper thread cutting knife assembly 13 can clamp the thread first when closing the scissors through its own ingenious design, and then cut the thread on the fabric after the thread is clamped.

[0048] Preferably, see Figures 2 to 5 The presser foot structure includes a presser foot bracket 14 and a closed shear plate 15. The closed shear plate 15 is installed on the presser foot bracket 14 and is arranged close to the scissor structure. The function of the closed shear plate 15 is that when the sewing is completed and the thread needs to be trimmed, the thread trimming bracket 5 drives the scissor frame 12 forward under the action of the trajectory of the thread trimming cam assembly 6. When the notch 102 of the advance and retreat guide plate 1 moves to the position of the roller 10, the state of waiting for trimming changes to the closed state of trimming under the tension of the thread trimming spring 11.

[0049] This embodiment also provides a buttonhole machine, which adopts the above-mentioned surface cutting mechanism.

[0050] See also Figures 2 to 5The advance and retreat guide plate 1 in this embodiment has an inner side wall of the notch 102 that abuts against the roller 10 with a certain bevel angle, so that when the face shearing mechanism on the buttonhole machine changes from the waiting state to the closed state, the face shearing mechanism moves forward as a whole. When the notch 102 of the advance and retreat guide plate 1 moves to the roller 10 position, under the strong pulling force of the thread trimming spring 11, the scissors frame 12 quickly rotates to the right with the axial screw at the connection between the thread trimming bracket 5 and the thread trimming crank assembly 4 as the center of the circle, so that the roller 10 abuts against the inclined inner side wall in the notch 102 of the advance and retreat guide plate 1. At this time, the advance and retreat guide plate 1 has a tendency to continue moving forward, and because of the strong pulling force of the guide spring 8, the advance and retreat guide plate 1 remains in a stable state.

[0051] That is, see Figure 4 and Figure 5 In the use state, the advance and retreat guide plate 1 of this embodiment abuts against the roller 10 through the inclined inner wall, and has a certain buffer amount when moving forward compared with the original advance and retreat guide plate, so that most of the kinetic energy generated by the rapid right turn of the scissors frame 12 can be absorbed, so that the scissors frame 12 can contact the shoulder of the presser foot guide shaft assembly 16 more gently, thereby greatly avoiding the emission of strong impact noise; at the same time, the closing shear lever of the upper thread trimmer assembly 13 can contact the closing shear plate 15 gently to close the shear clamp and cut the line, thereby avoiding the originally clamped line from being detached from the scissors due to the violent vibration of the clamping piece of the upper thread trimmer assembly 13 after being cut.

[0052] Obviously, the utility model conducts a root cause analysis based on the existing technical problems and makes use of the characteristics of the existing mechanisms. It only needs to change the structure of the advance and retreat guide plate 1 as a key component to greatly improve the relevant deficiencies. The advance and retreat guide plate 1 in this embodiment is only adjusted at the notch 102, and the other parts remain unchanged. Therefore, the structure is simple, and the impact of the surface shearing mechanism operation is reduced, the stability of the clamping shearing line is improved, and the purpose of reducing the line cutting noise from the source is achieved. Moreover, the cost of the advance and retreat guide plate, the surface shearing mechanism and the buttonhole machine before and after the improvement does not change.

[0053] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An advance and retreat guide plate, characterized in that: The advance and retreat guide plate (1) is provided with a strip slide groove (101) in the middle position and a notch (102) is formed inwardly at the edge position. The strip slide groove (101) can cooperate with the limit screw on the dough shearing mechanism to realize the back and forth sliding of the advance and retreat guide plate (1). The notch (102) can cooperate with the feed control part on the dough shearing mechanism to realize the adjustment from the ready-to-shear state to the closed-shear state. The inner side wall of the notch (102) close to the strip slide groove (101) is perpendicular to the inner bottom wall, and the inner side wall of the notch (102) away from the strip slide groove (101) is connected to the inner bottom wall at an obtuse angle.

2. A dough shearing mechanism, characterized in that: The invention comprises a forward and backward moving driving structure, a closed shear buffer structure, a scissors structure and a presser foot structure. The forward and backward moving driving structure is fixed on the housing of the buttonhole machine and simultaneously drives the closed shear buffer structure and the scissors structure to move back and forth. The closed shear buffer structure can adjust the face shear mechanism from a ready-to-cut state to a closed shear state. The closed shear buffer structure is provided with an advance and retreat guide plate (1) as claimed in claim 1. The presser foot structure is arranged close to the scissors structure.

3. The dough cutting mechanism according to claim 2, characterized in that: The forward and backward moving driving structure comprises a motor mounting plate (2), a slow-wire hook guide crank assembly (3), a wire trimming connecting crank assembly (4) and a wire trimming bracket (5); the motor mounting plate (2) is fixed on the housing of the buttonhole machine; a face trimming motor is fixed on the motor mounting plate (2); a wire trimming cam assembly (6) is vertically fixed on the motor shaft of the face trimming motor; the slow-wire hook guide crank assembly (3) and the wire trimming connecting crank assembly (4) are both hinged on the motor mounting plate (2); the slow-wire hook guide crank assembly (3) and the wire trimming connecting crank assembly (4) are ... The cam roller at the middle position of the crank assembly (3) is inserted into the cam groove on the thread trimming cam assembly (6); the thread trimming connecting crank assembly (4) is installed on the thread trimming bracket (5), and the thread trimming bracket (5) can be deflected relative to the thread trimming connecting crank assembly (4); the cam roller on the lowermost end of the thread slowing hook guide crank assembly (3) cooperates with the transverse movement groove on the thread trimming bracket (5); and the closed shear buffer structure and the scissors structure are both connected to the thread trimming bracket (5).

4. The dough cutting mechanism according to claim 3, characterized in that: The closed shear buffer structure comprises an advance and retreat fixed plate (7), an advance and retreat guide plate (1), a guide spring (8), a limit plate (9), a roller (10) and a wire cutting spring (11); the advance and retreat fixed plate (7) is mounted on the wire cutting bracket (5); the strip-shaped slide groove (101) on the advance and retreat guide plate (1) cooperates with the limit screw on the advance and retreat fixed plate (7); the guide spring (8) is kept in a taut state and its two ends are respectively hooked on the limit screw of the advance and retreat fixed plate (7) and the advance and retreat guide plate (1); the limit plate (9) is fixed on the advance and retreat fixed plate (7) and abuts against the advance and retreat guide plate (1) away from the notch (102); the roller (10) is fixed on the housing and abuts against the groove track on the advance and retreat fixed plate (7); the wire cutting spring (11) is kept in a taut state and its two ends are respectively connected to the scissors structure and the connecting plate on the housing.

5. The dough cutting mechanism according to claim 3, characterized in that: The scissors structure comprises a scissors frame (12) and an upper thread cutting knife assembly (13); the scissors frame (12) is mounted on the thread cutting bracket (5); and the upper thread cutting knife assembly (13) is mounted on the scissors frame (12).

6. The dough cutting mechanism according to claim 3, characterized in that: The presser foot structure comprises a presser foot bracket (14) and a closed shear plate (15); the closed shear plate (15) is mounted on the presser foot bracket (14), and the closed shear plate (15) is arranged close to the scissors structure.

7. A buttonholing machine, characterized in that: Adopt the dough cutting mechanism described in any one of claims 2-6.

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