Laser cutting device for workpieces

Abstract

The present invention relates to the field of laser cutting, and in particular to a laser cutting device for workpieces, comprising a base frame, a moving part is installed at the rear edge of the upper end of the base frame, the front end of the moving part is connected to a fixed frame, a connecting shaft is installed below the fixed frame through an elastic sliding part, the outer surface of the connecting shaft is coaxially inlaid with a rotating gear, the upper part of the rotating gear is meshed with a driving gear plate, a connecting block is fixedly installed on the upper end of the driving gear plate, the end of the connecting block is fixed to the fixed frame, a rotating frame is fixedly installed on the front end of the connecting shaft, an adjusting part is installed at the end of the rotating frame, a laser cutting gun is connected to the end of the adjusting part, a limiting part is installed at the lower end of the base frame, and the laser cutting gun is aligned with the connecting shaft. The present invention can adapt to the shape of a plate workpiece with a curved edge for cutting, and can also facilitate cutting of workpieces of different widths, effectively meeting the cutting requirements, while ensuring excellent cutting quality.

Description

Technical Field

[0001] The invention relates to the field of laser cutting, in particular to a laser cutting device for a workpiece. Background Art

[0002] Laser cutting uses a high-energy-density laser beam to heat the workpiece, causing the temperature to rise rapidly, reaching the boiling point of the material in a very short time, and the material begins to vaporize and form steam. The steam is ejected at a very high speed, and while the steam is ejected, a cut is formed on the material. When using laser cutting facilities to cut some special-shaped workpieces such as plates with curved edges, the laser cutting gun is difficult to flexibly adapt to the plane and curved surface of the plate for cutting, and its cutting limitations are large, making it difficult to meet cutting requirements. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings existing in the background technology and to propose a laser cutting device for a workpiece.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a laser cutting device for workpieces, including a base frame, a moving part is installed at the rear edge of the upper end of the base frame, the front end of the moving part is connected to a fixed frame, a connecting shaft is installed below the fixed frame through an elastic sliding part, the outer surface of the connecting shaft is coaxially inlaid with a rotating gear, the upper part of the rotating gear is meshed with a driving gear plate, a connecting block is fixedly installed on the upper end of the driving gear plate, the end of the connecting block is fixed to the fixed frame, a rotating frame is fixedly installed on the front end of the connecting shaft, an adjusting part is installed at the end of the rotating frame, the end of the adjusting part is connected to a laser cutting gun, a limiting part is installed at the lower end of the base frame, and the laser cutting gun is aligned with the connecting shaft.

[0005] Preferably, the elastic sliding member includes a connecting sleeve coaxially rotatably installed on the rear end of the connecting shaft, two guide rods are symmetrically fixedly installed on the side of the fixed frame, the outer surfaces of the two guide rods are slidably sleeved with a pushing sleeve, the pushing sleeve is connected to the connecting sleeve, the end of the guide rod is coaxially inlaid with a top cap, the outer side of the guide rod is wrapped with a spring body, one end of the spring body is fixed to the top cap, and the other end of the spring body is fixed to the pushing sleeve, and an extension seat is fixedly installed on the side of the connecting sleeve, and the end of the extension seat is fixed to the lower ends of the two pushing sleeves.

[0006] Preferably, the adjusting member comprises an adjusting shell fixedly mounted on the end of the rotating frame, an adjusting frame is fittedly mounted inside the adjusting shell, the adjusting frame extends from the front end of the adjusting shell to the outside, a threaded sleeve is penetrated and inlaid at the front edge of the upper end of the adjusting shell, a threaded column is penetrated and tightened inside the threaded sleeve, the threaded column is pressed against the adjusting frame, a gun seat is fixedly mounted on the outside of the laser cutting gun, and the gun seat is fixed to the end of the adjusting frame.

[0007] Preferably, the limiting member includes a concave frame fixedly installed on the lower end of the base frame, a plurality of brackets are fixedly installed in a linear array on the upper end of the concave frame, a support frame is fixedly installed on the upper end of the bracket, the support frame is horizontally arranged, a limiting ear is fixedly installed on the rear end of the bracket, the upper end surface of the limiting ear is higher than the upper end surface of the support frame, and a centering retaining ring is arranged on the rear side of the bracket located at the edge, and the centering retaining ring corresponds to the connecting sleeve.

[0008] Preferably, a column seat is fixedly installed on the side of the bracket located at the edge, a fixing column is embedded through the end of the column seat, the axis line of the fixing column is colinear with the axis line of the centering retaining ring, an extension frame is fixedly installed on the side of the centering retaining ring, the end of the extension frame is fixed to the bracket located at the edge, a plurality of bearing sleeves are coaxially embedded in a linear array on the outer surface of the fixing column, a plurality of centering plates are fixedly installed in an annular array on the outer surface of the bearing sleeve, and the plurality of centering plates are gathered together.

[0009] Preferably, the movable part includes a carrier frame fixedly mounted at the upper rear edge of the base frame, a movable seat is arranged on the outer side of the middle part of the carrier frame, a guide rail is fixedly mounted on the front end surface and the upper end surface of the carrier frame, a sliding seat is slidably mounted on the outer surface of the guide rail, the end of the sliding seat is fixed to the movable seat, and a fixed seat is embedded in the upper end of the fixed frame, and the fixed seat is fixed to the front end of the movable seat.

[0010] Preferably, a moving tooth plate is fixedly installed at the rear end of the carrier frame, a servo motor is fixedly installed at the rear edge of the lower end of the moving seat, the output end of the servo motor passes through the upper end of the moving seat, and a shaft is rotatably installed at the lower end of the moving seat, the shaft is located on the side of the servo motor, the shaft passes through the upper end of the moving seat, a synchronous belt is connected between the upper end of the shaft and the output end of the servo motor, a moving gear is coaxially inlaid on the outer surface of the shaft, and the moving gear is meshed with the moving tooth plate.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The moving seat can drive the laser cutting gun to move in a straight line to cut the flat section of the workpiece. When the laser cutting gun moves to the curved section of the workpiece, the connecting sleeve just fits on the centering ring, so that the connecting sleeve remains stationary and does not continue to move with the moving seat. Then the moving seat continues to move to drive the driving gear plate to move, so that the rotating gear is pushed by the moving driving gear plate, so that the rotating gear can rotate, and then drive the connecting shaft on the connecting sleeve to rotate, so that the laser cutting gun on the rotating frame can rotate in a circle to cut the curved section of the workpiece, so as to adapt to the shape of the workpiece for cutting, reduce cutting limitations, and meet its cutting needs.

[0013] 2. Under the action of multiple centering plates gathered together in a circular array, the curved surface segment of the workpiece can be limited so that the center of the curved surface segment of the workpiece can be collinear with the axis of the fixed column. At this time, the connecting sleeve is limited in cooperation with the centering retaining ring so that the axis of the connecting shaft and the axis of the fixed column are collinear, so as to ensure that the laser cutting gun can rotate around the center of the curved surface segment of the workpiece when rotating in a circle, that is, to ensure that the laser cutting gun can always cut perpendicularly to the curved surface segment of the workpiece during the cutting process, thereby ensuring its excellent cutting quality.

[0014] 3. By loosening the threaded column, the adjustment frame pressed by the threaded column can be moved, so that the adjustment frame can extend out of the adjustment shell, thereby driving the laser cutting gun to move, so as to adjust the position of the laser cutting gun, so as to cut workpieces of different widths to meet its cutting needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a laser cutting device for a workpiece according to the present invention;

[0016] Figure 2 The laser cutting device for workpieces of the present invention Figure 1 A magnified view of middle;

[0017] Figure 3 It is a schematic diagram of a rotating frame of a laser cutting device for a workpiece according to the present invention;

[0018] Figure 4 It is a schematic diagram of a driving gear plate of a laser cutting device for a workpiece according to the present invention;

[0019] Figure 5 It is a schematic diagram of a moving seat of a laser cutting device for a workpiece according to the present invention;

[0020] Figure 6 The laser cutting device for workpieces of the present invention Figure 4 Enlarged view of middle B;

[0021] Figure 7This is a usage view of the laser cutting device of the present invention for a workpiece.

[0022] In the figure: 1, base frame; 2, bearing frame; 3, moving seat; 4, rotating frame; 5, laser cutting gun; 6, concave frame; 7, support plate frame; 8, fixed column; 9, fixed frame; 10, fixed seat; 11, slide seat; 12, guide rail; 13, gun seat; 14, driving gear plate; 15, connecting shaft; 16, rotating gear; 17, connecting sleeve; 18, adjusting shell; 19, adjusting frame; 20, threaded sleeve; 21, threaded column; 22, connecting block; 23, top cap; 24, guide rod; 25, pushing sleeve; 26, spring body; 27, extending seat; 28, bearing sleeve; 29, centering plate; 30, extending frame; 31, centering retaining ring; 32, column seat; 33, limiting ear; 34, bracket; 35, servo motor; 36, synchronous belt; 37, shaft body; 38, moving gear; 39, moving gear plate; 40, workpiece. DETAILED DESCRIPTION

[0023] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0024] like Figure 1-Figure 7 The laser cutting device for workpieces shown in the figure comprises a base frame 1, a moving part is installed at the rear edge of the upper end of the base frame 1, and a fixed frame 9 is connected to the front end of the moving part. The fixed frame 9 serves to carry the driving gear plate 14, and a connecting shaft 15 is installed below the fixed frame 9 through an elastic sliding member. The connecting shaft 15 serves to drive the rotating frame 4 to rotate. A rotating gear 16 is coaxially inlaid on the outer surface of the connecting shaft 15, and the upper part of the rotating gear 16 is meshed with the driving gear plate 14. The rotating gear 16 and the driving gear plate 14 serve to drive the connecting shaft 15 to rotate. A connecting block 22 is fixedly installed on the upper end of the driving gear plate 14, and the end of the connecting block 22 is connected to the driving gear plate 14. The fixed frame 9 is fixed, and the connecting block 22 plays the role of fixing the driving gear plate 14. The front end of the connecting shaft 15 is fixedly installed with a rotating frame 4, and the end of the rotating frame 4 is installed with an adjusting member. The rotating frame 4 plays the role of driving the laser cutting gun 5 to rotate, and the end of the adjusting member is connected to the laser cutting gun 5. The laser cutting gun 5 is connected to an external laser facility for use. Because laser cutting is a prior art and has been widely used, it is not elaborated here. A limiting member is installed at the lower end of the base frame 1, and the laser cutting gun 5 is aligned with the connecting shaft 15, so that the laser cutting gun 5 can always cut perpendicular to the curved surface segment of the workpiece 40.

[0025] The elastic sliding member includes a connecting sleeve 17 coaxially rotatably installed on the rear end of the connecting shaft 15. The connecting sleeve 17 carries the connecting shaft 15 and drives the rotating gear plate 14 to move, so that the rotating gear 16 is pushed by the moving driving gear plate 14, so that the rotating gear 16 can rotate, thereby driving the connecting shaft 15 on the connecting sleeve 17 to rotate, so that the laser cutting gun 5 on the rotating frame 4 can rotate with the center of the curved surface segment of the workpiece 40 as the center, that is, the laser cutting gun 5 can always cut perpendicular to the curved surface segment of the workpiece 40. Two guide rods 24 are symmetrically fixed on the side of the fixed frame 9, and the outer surfaces of the two guide rods 24 are slidably covered with a pushing sleeve 25. The guide rods 24 and the pushing sleeve 25 play a role in linearly guiding the connecting sleeve 17, and the pushing sleeve 25 is connected to the connecting sleeve 17.

[0026] A top cap 23 is coaxially inlaid at the end of the guide rod 24, and a spring body 26 is wrapped around the outer side of the guide rod 24. The top cap 23 supports the spring body 26. One end of the spring body 26 is fixed to the top cap 23, and the other end of the spring body 26 is fixed to the push sleeve 25. When the connecting sleeve 17 is fitted on the centering retaining ring 31, the connecting sleeve 17 remains stationary. When the moving seat 3 continues to move to drive the driving gear plate 14 to move, the spring body 26 will shrink and deform to offset the force of the continued movement of the fixed frame 9, so that the connecting sleeve 17 remains stationary. An extension seat 27 is fixedly installed on the side of the connecting sleeve 17. The end of the extension seat 27 is fixed to the lower ends of the two push sleeves 25. The extension seat 27 connects the push sleeve 25 and the connecting sleeve 17 together.

[0027] The adjusting member includes an adjusting shell 18 fixedly mounted on the end of the rotating frame 4, an adjusting frame 19 is fittedly mounted inside the adjusting shell 18, and the adjusting shell 18 plays a role of supporting the adjusting frame 19, and the adjusting frame 19 extends from the front end of the adjusting shell 18 to the outside, and the adjusting frame 19 plays a role of adjusting the position of the laser cutting gun 5, and a threaded sleeve 20 is penetrated and inlaid at the front edge of the upper end of the adjusting shell 18, and a threaded column 21 is penetrated and tightened inside the threaded sleeve 20, and the threaded sleeve 20 plays a role of cooperating with the threaded column 21, and the threaded column 21 is pressed on the adjusting frame 19, and the threaded column 21 plays a role of fixing the adjusting frame 19, and a gun seat 13 is fixedly mounted on the outside of the laser cutting gun 5, and the gun seat 13 plays a role of supporting the laser cutting gun 5, and the gun seat 13 is fixed to the end of the adjusting frame 19.

[0028] The limiting member includes a concave frame 6 fixedly installed on the lower end of the base frame 1, and a plurality of brackets 34 are fixedly installed in a linear array on the upper end of the concave frame 6. The concave frame 6 serves to support the bracket 34, and a support frame 7 is fixedly installed on the upper end of the bracket 34. The support frame 7 serves to support the workpiece 40. The support frame 7 is horizontally arranged, and a limiting ear 33 is fixedly installed on the rear end of the bracket 34. The limiting ear 33 can limit the workpiece 40 to facilitate cutting out a workpiece 40 of a constant width. The upper end surface of the limiting ear 33 is higher than the upper end surface of the support frame 7. A centering retaining ring 31 is arranged on the side and rear of the bracket 34 located at the edge. The centering retaining ring 31 can position the connecting sleeve 17 so that the axis center of the connecting shaft 15 and the axis center of the fixed column 8 are in line, and the centering retaining ring 31 corresponds to the connecting sleeve 17.

[0029] A column seat 32 is fixedly installed on the side of the bracket 34 located at the edge, and a fixed column 8 is embedded through the end of the column seat 32. The column seat 32 serves to support the fixed column 8. The axis line of the fixed column 8 is collinear with the axis line of the centering retaining ring 31. An extension frame 30 is fixedly installed on the side of the centering retaining ring 31. The end of the extension frame 30 is fixed to the bracket 34 located at the edge, and the extension frame 30 serves to fix the centering retaining ring 31. A plurality of bearing sleeves 28 are coaxially embedded in a linear array on the outer surface of the fixed column 8. The bearing sleeves 28 serve to support the centering plate 29. A plurality of centering plates 29 are fixedly installed in an annular array on the outer surface of the bearing sleeve 28. The plurality of centering plates 29 are gathered together, and the centering plate 29 can limit the curved surface segment of the workpiece 40 so that the center of the curved surface segment of the workpiece 40 can be collinear with the axis of the fixed column 8.

[0030] The moving part includes a carrier frame 2 fixedly installed at the upper rear edge of the base frame 1, a moving seat 3 is arranged on the outer middle part of the carrier frame 2, the carrier frame 2 plays a role in supporting the moving seat 3, the moving seat 3 can drive the laser cutting gun 5 to move in a straight line, the front end surface of the carrier frame 2 and the upper end surface of the carrier frame 2 are fixedly installed with a guide rail 12, the outer surface of the guide rail 12 is slidably installed with a slide seat 11, the guide rail 12 and the slide seat 11 play a role in guiding the moving seat 3, the end of the slide seat 11 is fixed to the moving seat 3, the upper end of the fixed frame 9 is inlaid with a fixed seat 10, the fixed seat 10 is fixed to the front end of the moving seat 3, and the fixed seat 10 plays a role in fixing the fixed frame 9.

[0031] A moving gear plate 39 is fixedly installed at the rear end of the carrier 2, and a servo motor 35 is fixedly installed at the rear edge of the lower end of the moving seat 3. The output end of the servo motor 35 passes through the upper end of the moving seat 3, and the servo motor 35 drives the moving gear 38 to rotate. A shaft 37 is rotatably installed at the lower end of the moving seat 3, and the shaft 37 carries the moving gear 38. The shaft 37 is located on the side of the servo motor 35, and the shaft 37 passes through the upper end of the moving seat 3. The upper end of the shaft 37 is connected to the servo motor A synchronous belt 36 is connected between the output ends of the machine 35, and the synchronous belt 36 plays a transmission role. A moving gear 38 is coaxially inlaid on the outer surface of the shaft 37, and the moving gear 38 is meshed with a moving tooth plate 39. The servo motor 35 drives the shaft 37 to rotate through the synchronous belt 36, and then drives the moving gear 38 on the shaft 37 to rotate, so that the moving gear 38 can roll on the moving tooth plate 39 to drive the moving seat 3 to move. At this time, the slide seat 11 slides on the guide rail 12 to assist the movement of the moving seat 3.

[0032] During laser cutting, the threaded column 21 is loosened according to the width of the workpiece 40 to be cut, so that the adjustment frame 19 pressed by the threaded column 21 can move, so that the adjustment frame 19 can extend out of the adjustment shell 18, thereby driving the laser cutting gun 5 to move, so as to adjust the position of the laser cutting gun 5 to adapt to the cutting width, and then the workpiece 40 is placed on the support frame 7, and the rear end of the workpiece 40 is pressed against the limiting ear 33 to limit the workpiece 40. At this time, the centering plate 29 is attached to the curved surface segment of the workpiece 40, so that under the action of multiple centering plates 29 in a circular array and gathered together, the curved surface segment of the workpiece 40 is limited, so that the center of the curved surface segment of the workpiece 40 can be colinear with the axis of the fixed column 8, and then the servo motor 35 works to drive the shaft body 37 to rotate through the synchronous belt 36, and then drives the moving gear 38 on the shaft body 37 to rotate, so that the moving gear 38 can roll on the moving tooth plate 39 to drive the moving seat 3 moves, at this time the slide 11 slides on the guide rail 12 to assist the movement of the moving seat 3, so that the moving moving seat 3 is used to drive the laser cutting gun 5 to move in a straight line to cut the plane section of the workpiece 40. When the laser cutting gun 5 moves to the curved section of the workpiece 40, the connecting sleeve 17 just fits on the centering retaining ring 31, so that the connecting sleeve 17 remains stationary and will not continue to move with the moving seat 3, and at the same time, the axis of the connecting shaft 15 and the axis of the fixed column 8 are made to be colinear, and then the moving seat 3 continues to move to drive the driving gear plate 14 to move, so that the rotating gear 16 is pushed through the moving driving gear plate 14, so that the rotating gear 16 can rotate, and then drive the connecting shaft 15 on the connecting sleeve 17 to rotate, so that the laser cutting gun 5 on the rotating frame 4 can rotate with the center of the curved section of the workpiece 40 as the center, that is, the laser cutting gun 5 can always cut perpendicularly to the curved section of the workpiece 40, so as to cut the workpiece 40.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A laser cutting device for a workpiece, comprising a base frame (1), characterized in that: A moving part is installed at the rear edge of the upper end of the base frame (1), the front end of the moving part is connected to a fixed frame (9), a connecting shaft (15) is installed below the fixed frame (9) through an elastic sliding part, the outer surface of the connecting shaft (15) is coaxially inlaid with a rotating gear (16), the upper part of the rotating gear (16) is meshed with a driving gear plate (14), a connecting block (22) is fixedly installed on the upper end of the driving gear plate (14), the end of the connecting block (22) is fixed to the fixed frame (9), the front end of the connecting shaft (15) is fixedly installed with a rotating frame (4), the end of the rotating frame (4) is installed with an adjusting part, the end of the adjusting part is connected to a laser cutting gun (5), a limiting part is installed at the lower end of the base frame (1), and the laser cutting gun (5) is aligned with the connecting shaft (15); The limiting member comprises a concave frame (6) fixedly mounted on the lower end of the base frame (1); a plurality of brackets (34) are fixedly mounted in a linear array on the upper end of the concave frame (6); a support frame (7) is fixedly mounted on the upper end of the bracket (34); the support frame (7) is arranged horizontally; a limiting ear (33) is fixedly mounted on the rear end of the bracket (34); the upper end surface of the limiting ear (33) is higher than the upper end surface of the support frame (7); a centering retaining ring (31) is arranged on the side and rear of the bracket (34) at the edge; the centering retaining ring (31) corresponds to the connecting sleeve (17); A column seat (32) is fixedly installed on the side of the bracket (34) located at the edge, and a fixed column (8) is embedded in the end of the column seat (32). The axis of the fixed column (8) is colinear with the axis of the centering retaining ring (31). An extension frame (30) is fixedly installed on the side of the centering retaining ring (31), and the end of the extension frame (30) is fixed to the bracket (34) located at the edge. The outer surface of the fixed column (8) is coaxially embedded with a plurality of bearing sleeves (28) in a linear array, and the outer surface of the bearing sleeve (28) is fixedly installed with a plurality of centering plates (29) in an annular array, and the plurality of centering plates (29) are gathered together.

2. The laser cutting device for a workpiece according to claim 1, characterized in that: The elastic sliding member comprises a connecting sleeve (17) coaxially rotatably mounted on the rear end of the connecting shaft (15); two guide rods (24) are symmetrically fixedly mounted on the side of the fixing frame (9); the outer surfaces of the two guide rods (24) are slidably sleeved with a pushing sleeve (25); the pushing sleeve (25) is connected to the connecting sleeve (17); the end of the guide rod (24) is coaxially inlaid with a top cap (23); the outer side of the guide rod (24) is wound with a spring body (26); one end of the spring body (26) is fixed to the top cap (23); the other end of the spring body (26) is fixed to the pushing sleeve (25); a protruding seat (27) is fixedly mounted on the side of the connecting sleeve (17); the end of the protruding seat (27) is fixed to the lower ends of the two pushing sleeves (25).

3. The laser cutting device for a workpiece according to claim 1, characterized in that: The adjusting member comprises an adjusting shell (18) fixedly mounted on the end of the rotating frame (4); an adjusting frame (19) is fittedly mounted inside the adjusting shell (18); the adjusting frame (19) extends from the front end of the adjusting shell (18) to the outside; a threaded sleeve (20) is inserted through the front edge of the upper end of the adjusting shell (18); a threaded column (21) is screwed through the inside of the threaded sleeve (20); the threaded column (21) is pressed against the adjusting frame (19); a gun seat (13) is fixedly mounted on the outside of the laser cutting gun (5); the gun seat (13) is fixed to the end of the adjusting frame (19).

4. The laser cutting device for a workpiece according to claim 1, characterized in that: The movable member comprises a support frame (2) fixedly mounted at the rear edge of the upper end of the base frame (1); a movable seat (3) is arranged on the outer side of the middle part of the support frame (2); a guide rail (12) is fixedly mounted on the front end surface of the support frame (2) and the upper end surface of the support frame (2); a sliding seat (11) is slidably mounted on the outer surface of the guide rail (12); the end of the sliding seat (11) is fixed to the movable seat (3); a fixed seat (10) is embedded in the upper end of the fixed frame (9); and the fixed seat (10) is fixed to the front end of the movable seat (3).

5. The laser cutting device for a workpiece according to claim 4, characterized in that: A moving tooth plate (39) is fixedly mounted at the rear end of the carrier frame (2); a servo motor (35) is fixedly mounted at the rear edge of the lower end of the moving seat (3); an output end of the servo motor (35) passes through the upper end of the moving seat (3); a shaft (37) is rotatably mounted at the lower end of the moving seat (3); the shaft (37) is located on the side of the servo motor (35); the shaft (37) passes through the upper end of the moving seat (3); a synchronous belt (36) is connected between the upper end of the shaft (37) and the output end of the servo motor (35); a moving gear (38) is coaxially inlaid on the outer surface of the shaft (37); and the moving gear (38) is meshed with the moving tooth plate (39).

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