Workpiece movement adjustment device based on automated mechanical equipment welding processing

Abstract

The present invention provides a workpiece movement and adjustment device based on automated mechanical equipment welding processing, which relates to the technical field of workpiece adjustment devices, including: a moving component, wherein the active rod is rotatably connected to the inside of a control shell, and the device has two usage modes. When in a fast coarse adjustment mode, it can realize the demand for fast positioning of the workpiece in welding operations, and when in a precise fine adjustment mode, it can adapt to the demand for precise positioning of the workpiece in welding operations, and the control and switching of the two modes and the control of the movement of the workpiece fixing seat are all integrated on the main control rod for operation, which solves the problem that the movement adjustment device can only control the speed of the workpiece movement by changing and controlling the rotation speed of the driving rod, resulting in poor accuracy, cumbersome adjustment, slow rate, inability to adapt to the demand for fine-tuning positioning and coarse adjustment of fast movement of the workpiece, and is time-consuming and labor-intensive.

Description

Technical Field

[0001] The present invention relates to the technical field of workpiece adjusting devices, and in particular to a workpiece moving adjusting device based on welding processing of automated mechanical equipment. Background Art

[0002] Automated equipment can not only liberate people from heavy physical labor, some mental labor and harsh and dangerous working environments, but also expand the functions of human organs, greatly improve labor productivity, and enhance human ability to understand and transform the world. Automated equipment requires welding technology in the production and processing process. The welding process can perform operations such as welding, fixing or cutting on the blanks that make up the automated mechanical equipment. Currently, when welding the blank workpiece, a mobile adjustment device is required to adjust the welding position of the workpiece.

[0003] However, as far as the current mobile adjustment device is concerned, it only has one adjustment mode. When controlling the speed of the workpiece movement, it can only be achieved by changing and controlling the rotation speed of the drive rod. It has poor accuracy, is troublesome to adjust, and has a slow speed. It cannot adapt to the use requirements of fine-tuning positioning and coarse-tuning rapid movement of the workpiece. Moreover, frequent coarse adjustments require frequent rotation of the drive rod multiple times, which is time-consuming and labor-intensive, and has poor adaptability and practicality. Summary of the Invention

[0004] In view of this, the present invention provides a workpiece movement and adjustment device based on automated mechanical equipment welding processing, which has an adjustment component and a moving component. The coordinated use of the adjustment component and the moving component can realize two usage modes of the device: fast coarse adjustment and precise fine adjustment. When in the fast coarse adjustment mode, the workpiece fixing seat only needs to rotate the main control lever a small amount to realize the fast movement and adjustment of the welding position of the workpiece fixing seat, which can meet the needs of fast positioning in the workpiece welding operation. When in the precise fine adjustment mode, the workpiece fixing seat needs to rotate the main control lever relatively more to achieve a large range of movement, thereby being able to meet the needs of precise positioning in the workpiece welding operation, and has strong adaptability. The control and switching of the two modes and the control of the movement of the workpiece fixing seat are all integrated on the main control lever. It is flexible to use, easy to operate, and has strong flexibility, adaptability and practicality.

[0005] The present invention provides a workpiece movement and adjustment device based on welding processing of automated mechanical equipment, specifically comprising: an installation component, the installation component comprising a control shell, a movable shell and a workpiece fixing seat, the movable shell is fixedly installed on the side of the control shell, and the workpiece fixing seat is inserted into the interior of the movable shell; an adjustment component, the adjustment component comprising a master control rod, a transmission worm and a control fork, the master control rod is inserted into the interior of the control shell, and the transmission worm is rotatably connected to the interior of the control shell, the control fork is inserted into the interior of the control shell, and the control fork is rotatably connected to the outside of the master control rod; a movable component, the movable component comprising a movable rod, an active rod, a transmission worm gear and a control shift block, the movable rod is rotatably connected to the interior of the movable shell, and the active rod is rotatably connected to the interior of the control shell, the transmission worm gear is fixedly installed on one end of the active rod, and the transmission worm gear is transmission-connected to the transmission worm, and the control shift block is inserted into the interior of the control shell.

[0006] Optionally, the cross-section of the workpiece fixing seat is T-shaped, and a thread is provided on the outside of the rod body of the moving rod, and the moving rod is screwed to the bottom of the workpiece fixing seat through the thread of the rod body.

[0007] Optionally, a synchronization protrusion is provided on the outside of the rod body of the master control rod, and a synchronization groove is provided on the inside of the transmission worm, and the synchronization protrusion is inserted into the inside of the synchronization groove.

[0008] Optionally, the moving assembly also includes a speed-changing gear set, which consists of a moving gear a, a moving gear b, a coarse-adjustment gear and a fine-adjustment gear. The moving gear a and the moving gear b are both rotatably connected to the inside of the control housing, and the moving gear a and the moving gear b are fixedly installed at one end of the moving rod, the coarse-adjustment gear is rotatably connected to the outside of the active rod, and the fine-adjustment gear is inserted into the outside of the active rod, and one side of the fine-adjustment gear is rotatably connected to the inside of the control shift block.

[0009] Optionally, a spring disk is provided at one end of the rod body of the master control rod, and a control top spring is provided on the side of the spring disk, and two ends of the control top spring are respectively fixedly connected to the inside of the control housing and the side of the spring disk.

[0010] Optionally, the control fork is a "U"-shaped fork body, and a linkage lever is provided at the bottom of the control fork, the cross-sectional shape of the control block is "L"-shaped, and an inclined positioning groove is provided at the top of the control block, and the linkage lever is inserted into the inside of the positioning groove.

[0011] Optionally, a synchronous tooth groove is provided on the side of the coarse adjustment gear.

[0012] Optionally, the rod body of the active rod is provided with a transmission slide groove, and the interior of the fine-tuning gear is provided with a transmission slider, and the transmission slider is inserted into the interior of the transmission slide groove.

[0013] Optionally, the coarse adjustment gear and the moving gear a are meshed with each other for transmission.

[0014] Beneficial effects

[0015] The device has two usage modes under the cooperation of the adjustment component and the moving component. When in the fast coarse adjustment mode, the workpiece fixing seat only needs to rotate the main control lever a small amount to achieve fast movement of the workpiece fixing seat to adjust the welding position, which can meet the needs of fast positioning in the workpiece welding operation. When in the precise fine adjustment mode, the workpiece fixing seat needs to rotate the main control lever relatively more to achieve a large range of movement, thereby meeting the needs of precise positioning in the workpiece welding operation. It has strong adaptability, and the control and switching of the two modes and the control of the movement of the workpiece fixing seat are integrated on the main control lever. It is flexible to use and easy to operate, which improves the flexibility, adaptability and practicality of the device.

[0016] In addition, the master control lever of the device can drive the moving lever to rotate through the speed-changing gear set, thereby realizing the demand of adjusting the use position of the workpiece fixing seat. When the master control lever rotates, the synchronous protrusion can drive the transmission worm to rotate synchronously through the synchronous groove. When the transmission worm rotates, it can drive the active lever to rotate through the transmission worm gear. When the active lever rotates, the transmission slide groove can drive the fine-tuning gear to rotate through the transmission slider, thereby realizing the rotation of the moving lever driven by the master control lever under the action of the speed-changing gear set. When the moving lever rotates, it can drive the workpiece fixing seat to change its use position through the rod body thread, thereby adjusting the processing position of the workpiece on the top of the workpiece fixing seat. It is flexible to use and easy to operate.

[0017] In addition, the device realizes different transmission rates of the master control rod to the moving rod by changing the transmission ratio of the speed gear set. When the device is in the reset state, it is in the precise fine-tuning mode. At this time, the fine-tuning gear and the moving gear b are engaged for transmission, so that the moving rod rotates slowly under the drive of the master control rod, and the movement rate of the workpiece fixing seat is slow, thereby realizing the precise fine-tuning usage mode. In the precise fine-tuning mode, when the moving rod rotates, the moving gear a will drive the coarse-adjusting gear to idle, and the coarse-adjusting gear will not be stuck in the device. It is stable to use and easy to adjust.

[0018] In addition, when the device is in the fast coarse adjustment mode, the fine-tuning gear is located inside the synchronous tooth groove, and the fine-tuning gear is no longer in contact with the moving gear b. Therefore, when the master control lever is rotated, the fine-tuning gear can drive the coarse adjustment gear to rotate through the synchronous tooth groove, thereby realizing the transmission of the moving rod under the cooperation of the coarse adjustment gear and the moving gear a, and the idling of the moving gear b at this time will not jam the device. Therefore, the moving rod rotates at a fast rate under the drive of the master control lever, realizing the need for fast coarse adjustment positioning, and can adapt to the different movement and adjustment needs of the workpiece during the welding process, thereby improving the adaptability of the device.

[0019] In addition, the switching mode of the device is also integrated on the master control lever for operation, which is convenient and flexible to use. When the device is in the reset state, the master control lever is also in the reset state under the action of the control top spring. At this time, the linkage lever of the control fork is located at the front end of the positioning slot, so that the fine-tuning gear disengages from the synchronous slot and transmits with the moving gear b at the same time, so that the device is in the precise fine-tuning mode when it is in the reset state. When the master control lever is pressed inward, the master control lever drives the control fork to move. When the control fork moves, the linkage lever can drive the control block to one side through the positioning slot, thereby realizing that the fine-tuning gear enters the synchronous slot and loses the transmission relationship with the moving gear b, thereby switching to a fast coarse adjustment mode. It is easy to adjust and flexible to use. After releasing the master control lever, the device can automatically reset under the action of the control top spring, and the degree of automation is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0021] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0022] In the attached figure:

[0023] Figure 1 A schematic diagram showing the structure of the present invention;

[0024] Figure 2 A schematic diagram of the internal structure of the present invention when the reset state is in the precise fine-tuning mode is shown;

[0025] Figure 3 It shows a schematic diagram of the internal structure of the present invention when the master control lever is pressed inwards and in the fast coarse adjustment mode;

[0026] Figure 4 A schematic diagram of the structure of the disassembled adjustment assembly of the present invention is shown;

[0027] Figure 5 It shows a schematic structural diagram of the mobile assembly of the present invention after disassembly;

[0028] Figure 6 The present invention is shown Figure 5 The structural diagram on the right;

[0029] Figure 7 It shows a schematic diagram of the structure of the installation assembly of the present invention after disassembly;

[0030] Figure 8 The present invention is shown Figure 2 A schematic diagram of the structure of the enlarged part A in the middle;

[0031] Figure 9 The present invention is shown Figure 3 Schematic diagram of the enlarged structure of part B in the middle.

[0032] Reference Signs List

[0033] 1. Mounting assembly; 101. Control housing; 102. Mobile housing; 103. Workpiece fixing seat; 2. Adjustment assembly; 201. Master control lever; 2011. Synchronizing protrusion; 2012. Control top spring; 202. Transmission worm; 2021. Synchronizing groove; 203. Control fork; 2031. Linkage lever; 3. Moving assembly; 301. Moving rod; 302. Active rod; 3021. Transmission slide; 303. Transmission worm gear; 304. Control shift block; 3041. Positioning shift groove; 305. Moving gear a; 306. Moving gear b; 307. Coarse adjustment gear; 3071. Synchronizing tooth groove; 308. Fine adjustment gear; 3081. Transmission slider. DETAILED DESCRIPTION

[0034] In order to make the purpose, scheme and advantages of the technical solution of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the common meanings in the art. The same reference numerals in the drawings represent the same components.

[0035] Example: Please refer to Figures 1 to 9 :

[0036] The present invention proposes a workpiece movement adjustment device based on automated mechanical equipment welding processing, comprising: an installation component 1, the installation component 1 includes a control housing 101, a mobile housing 102 and a workpiece fixing seat 103, the mobile housing 102 is fixedly installed on the side of the control housing 101, and the workpiece fixing seat 103 is plugged into the interior of the mobile housing 102; an adjustment component 2, the adjustment component 2 includes a master control rod 201, a transmission worm 202 and a control fork 203, the master control rod 201 is plugged into the control housing 101, and the transmission worm 202 is rotatably connected to the inside of the control housing 101, the control fork 203 is inserted into the inside of the control housing 101, and the control fork 203 is rotatably connected to the outside of the master control rod 201; the moving assembly 3, the moving assembly 3 includes a moving rod 301, an active rod 302, a transmission worm gear 303, a control shift block 304 and a speed change gear set, the moving rod 301 is rotatably connected to the inside of the moving housing 102, and the active rod 302 is rotatably connected to the inside of the control housing 101 The transmission worm gear 303 is fixedly mounted on one end of the active rod 302, and the transmission worm gear 303 is connected to the transmission worm 202. The control block 304 is inserted into the interior of the control housing 101. The device realizes different transmission rates of the master control rod 201 to the mobile rod 301 by changing the transmission ratio of the speed change gear group, so that the device has two sets of usage modes of fast coarse adjustment and precise fine adjustment. The speed change gear group consists of a mobile gear a305, a mobile gear b306, a coarse adjustment gear 307 and a fine adjustment gear. The movable gear a305 and the movable gear b306 are both rotatably connected to the inside of the control housing 101, and the movable gear a305 and the movable gear b306 are fixedly mounted on one end of the movable rod 301, the coarse adjustment gear 307 is rotatably connected to the outside of the active rod 302, and the fine adjustment gear 308 is inserted into the outside of the active rod 302, one side of the fine adjustment gear 308 is rotatably connected to the inside of the control shift block 304, and the coarse adjustment gear 307 and the movable gear a305 are engaged with each other for transmission.

[0037] Furthermore, according to an embodiment of the present invention, Figure 4As shown, a synchronous protrusion 2011 is provided on the outside of the rod body of the master control rod 201, and a synchronous groove 2021 is provided on the inside of the transmission worm 202. The synchronous protrusion 2011 is inserted into the inside of the synchronous groove 2021. In use, the master control rod 201 can drive the moving rod 301 to rotate through the speed change gear set, thereby achieving the demand for adjusting the use position of the workpiece fixing seat 103. When the master control rod 201 rotates, the synchronous protrusion 2011 can drive the transmission worm 202 to rotate synchronously through the synchronous groove 2021. When the transmission worm 202 rotates, it can drive the active rod 302 to rotate through the transmission worm gear 303. The rod body of the active rod 302 is provided with a transmission slide groove 3021, and the fine-tuning gear 30 A transmission slider 3081 is provided inside 8, and the transmission slider 3081 is inserted into the transmission slide 3021. When the active rod 302 rotates, the transmission slide 3021 can drive the fine-tuning gear 308 to rotate through the transmission slider 3081, so that under the action of the speed gear set, the main control rod 201 drives the moving rod 301 to rotate. The outside of the rod body of the moving rod 301 is provided with a thread, and the moving rod 301 is screwed to the bottom of the workpiece fixing seat 103 through the rod body thread. When the moving rod 301 rotates, it can drive the workpiece fixing seat 103 to move through the rod body thread, thereby realizing the use requirements of adjusting and changing the processing position of the workpiece on the top of the workpiece fixing seat 103, and it is flexible and convenient to use.

[0038] Furthermore, according to an embodiment of the present invention, Figure 7 As shown, the cross-sectional shape of the workpiece fixing seat 103 is "T"-shaped. During use, the "T"-shaped workpiece fixing seat 103 ensures that the workpiece fixing seat 103 will not be skewed or twisted when moving, resulting in the device being stuck and failing, and is stable to use.

[0039] Furthermore, according to an embodiment of the present invention, Figure 4As shown, a spring disk is provided at one end of the rod body of the master control lever 201, and a control top spring 2012 is provided on the side of the spring disk. The two ends of the control top spring 2012 are fixedly connected to the interior of the control housing 101 and the side of the spring disk respectively. In use, when the device is in the reset state, the master control lever 201 is also in the reset state under the action of the control top spring 2012. At this time, the linkage lever 2031 of the control fork 203 is located at the front end of the positioning slot 3041, so that the fine-tuning gear 308 disengages from the synchronous tooth groove 3071 and transmits to the moving gear b306 at the same time, so that When the device is in the reset state, it will be in the precise fine-tuning mode. When the device is in the precise fine-tuning mode, the fine-tuning gear 308 and the moving gear b306 are engaged for transmission, so that the moving rod 301 rotates slowly under the drive of the master control rod 201, and the movement rate of the workpiece fixing seat 103 is slow, thereby realizing the precise fine-tuning use mode. In the precise fine-tuning mode, when the moving rod 301 rotates, the moving gear a305 will drive the coarse-adjusting gear 307 to idle, and the coarse-adjusting gear 307 will not get stuck in the device. It is stable to use and easy to adjust.

[0040] Furthermore, according to an embodiment of the present invention, Figure 4 、 Figure 5 and Figure 6 As shown, the control fork 203 is a "U"-shaped fork body, and a linkage lever 2031 is provided at the bottom of the control fork 203. The cross-section of the control block 304 is "L"-shaped, and an inclined positioning groove 3041 is provided on the top of the control block 304. The linkage lever 2031 is inserted into the interior of the positioning groove 3041. In use, when the master control lever 201 is pressed inward, the master control lever 201 drives the control fork 203 to move. When the control fork 203 moves, the linkage lever 2031 can drive the control block 304 to move to one side through the positioning groove 3041. The side of the coarse adjustment gear 307 is provided with a synchronous tooth groove 3071, so that the fine adjustment gear 308 enters the synchronous tooth groove 3071 and loses the transmission relationship with the moving gear b306. Thus, it switches to the fast coarse adjustment mode. When the device is in the fast coarse adjustment mode, the fine-tuning gear 308 is located inside the synchronous tooth groove 3071, and the fine-tuning gear 308 is no longer in contact with the moving gear b306. Therefore, when the master control lever 201 is rotated, the fine-tuning gear 308 can drive the coarse adjustment gear 307 to rotate through the synchronous tooth groove 3071, thereby realizing the transmission of the moving rod 301 under the cooperation of the coarse adjustment gear 307 and the moving gear a305, and at this time, the idling of the moving gear b306 will not jam the device, so that the moving rod 301 rotates at a fast rate under the drive of the master control lever 201, realizing the demand for fast coarse adjustment positioning, and can adapt to the different movement and adjustment requirements of the workpiece during the welding process, thereby improving the adaptability of the device.

[0041] Specific usage and function of this embodiment: In the present invention, when welding a workpiece, the workpiece is fixed on the top of the workpiece fixing seat 103. First, the quick coarse adjustment mode of the device is used to quickly locate the use position of the workpiece fixing seat 103. The master control lever 201 is pressed inward, and the master control lever 201 drives the control fork 203 to move. When the control fork 203 moves, the linkage lever 2031 can drive the control block 304 to move to one side through the positioning groove 3041, thereby achieving the fine adjustment gear 308 entering the synchronous tooth groove 3071 and losing contact with the moving gear b. 306, thereby switching to the fast coarse adjustment mode. When in the fast coarse adjustment mode, the fine adjustment gear 308 is located inside the synchronous tooth groove 3071, and the fine adjustment gear 308 is no longer in contact with the moving gear b306. When the master control lever 201 is rotated, the fine adjustment gear 308 can drive the coarse adjustment gear 307 to rotate through the synchronous tooth groove 3071, thereby realizing the transmission use of the moving rod 301 under the cooperation of the coarse adjustment gear 307 and the moving gear a305, and at this time the idling of the moving gear b306 will not jam the device, so that the moving rod 301 The rotation speed is fast under the drive of the master control rod 201, which realizes the demand for rapid coarse adjustment and positioning. After the coarse adjustment is completed, the master control rod 201 is released. After the master control rod 201 is released, the device can automatically reset under the action of the control top spring 2012. When the device is in the reset state, the master control rod 201 is also in the reset state under the action of the control top spring 2012. At this time, the linkage lever 2031 of the control fork 203 is located at the front end of the positioning groove 3041, so that the fine adjustment gear 308 is disengaged from the synchronous tooth groove 3071 and transmits to the moving gear b306, so that the device is in the reset state. When in the reset state, it will be in the precise fine-tuning mode. When in the reset state, it is in the precise fine-tuning mode. At this time, the fine-tuning gear 308 and the moving gear b306 are engaged for transmission, so that the moving rod 301 rotates slowly under the drive of the master control rod 201, so that the moving speed of the workpiece fixing seat 103 is slow, thereby realizing the precise fine-tuning usage mode, and in the precise fine-tuning mode, when the moving rod 301 rotates, the moving gear a305 will drive the coarse-adjusting gear 307 to idle, and the coarse-adjusting gear 307 will not be stuck in the device. After the adjustment is completed, the workpiece can be welded.

[0042] Finally, it should be noted that when describing the positions of various components and the matching relationships between them, the present invention usually takes one / a pair of components as an example. However, those skilled in the art should understand that such positions, matching relationships, etc. are also applicable to other components / other pairs of components.

[0043] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the appended claims.

Claims

1. A workpiece movement and adjustment device for welding processing based on automated mechanical equipment, characterized in that: include: The mounting assembly (1) comprises a control housing (101), a movable housing (102) and a workpiece fixing seat (103), wherein the movable housing (102) is fixedly mounted on the side of the control housing (101), and the workpiece fixing seat (103) is plugged into the interior of the movable housing (102), and the cross-section of the workpiece fixing seat (103) is "T"-shaped; the adjusting assembly (2) comprises a master control rod (201), a transmission worm (20 2) and a control fork (203), the master control rod (201) is inserted into the interior of the control housing (101), and the transmission worm (202) is rotatably connected to the interior of the control housing (101), the control fork (203) is inserted into the interior of the control housing (101), and the control fork (203) is rotatably connected to the outside of the master control rod (201), the control fork (203) is a "U"-shaped fork body, and a linkage lever (2031) is provided at the bottom of the control fork (203); A moving assembly (3), the moving assembly (3) comprising a moving rod (301), an active rod (302), a transmission worm gear (303) and a control shift block (304), the moving rod (301) being rotatably connected to the interior of the moving housing (102), and the active rod (302) being rotatably connected to the interior of the control housing (101), the transmission worm gear (303) being fixedly mounted on one end of the active rod (302), and the transmission worm gear (303) being transmission-connected to the transmission worm (202), the control shift block (304) being plugged into the interior of the control housing (101), the rod body of the moving rod (301) being provided with a thread on the exterior, and the moving rod (301) being screwed to the bottom of the workpiece fixing seat (103) through the rod body thread; The moving assembly (3) further comprises a speed-changing gear set, which comprises a moving gear a (305), a moving gear b (306), a coarse adjustment gear (307) and a fine adjustment gear (308). The moving gear a (305) and the moving gear b (306) are both rotatably connected to the interior of the control housing (101), and the moving gear a (305) and the moving gear b (306) are fixedly mounted on one end of the moving rod (301). The coarse adjustment gear (307) is rotatably connected to the exterior of the active rod (302), and the fine adjustment gear (308) is plugged into the exterior of the active rod (302). One side of the fine adjustment gear (308) is rotatably connected to the interior of the control shift block (304). The cross-section of the control shift block (304) is in an "L" shape, and an inclined positioning shift groove (3041) is provided on the top of the control shift block (304). The linkage shift rod (2031) is plugged into the interior of the positioning shift groove (3041).

2. The workpiece movement and adjustment device for welding processing based on automated mechanical equipment according to claim 1, characterized in that: The master control lever (201) is provided with a synchronization protrusion (2011) on the outside of the lever body, and the transmission worm (202) is provided with a synchronization groove (2021) on the inside, and the synchronization protrusion (2011) is inserted into the synchronization groove (2021).

3. The workpiece movement and adjustment device for welding processing based on automated mechanical equipment according to claim 1, characterized in that: A spring disk is provided at one end of the rod body of the master control rod (201), and a control top spring (2012) is provided on the side of the spring disk. The two ends of the control top spring (2012) are respectively fixedly connected to the inside of the control housing (101) and the side of the spring disk.

4. The workpiece movement and adjustment device for welding processing based on automated mechanical equipment according to claim 1, characterized in that: A synchronous tooth groove (3071) is provided on the side surface of the coarse adjustment gear (307).

5. The workpiece movement and adjustment device for welding processing based on automated mechanical equipment according to claim 1, characterized in that: The rod body of the active rod (302) is provided with a transmission slide groove (3021), and the interior of the fine-tuning gear (308) is provided with a transmission slider (3081), and the transmission slider (3081) is inserted into the interior of the transmission slide groove (3021).

6. The workpiece movement and adjustment device for welding processing based on automated mechanical equipment as claimed in claim 4, characterized in that: The coarse adjustment gear (307) and the moving gear a (305) are engaged with each other for transmission.

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