Tempered glass positioning device

Abstract

The utility model belongs to toughened glass processing technical field especially relates to a kind of toughened glass positioning equipment, including workbench and supporting leg, workbench is equipped with the clamping slide that is driven by clamping mechanism, workbench is also equipped with lifting mechanism, lifting mechanism is also equipped with the glass suction cup that is driven by negative pressure pump, the top of workbench is equipped with reference post main body by positioning mechanism, clamping slide is opened with the limit slot of symmetrical distribution, the top of clamping slide is also opened with the avoiding slot for avoiding reference post main body, and the end of clamping slide protruding workbench is movably connected with feeding roller and adjusting runner respectively.The toughened glass positioning equipment, by setting the clamping slide that can slide along the circumference of workbench, cooperate with feeding roller and adjusting runner, and the glass suction cup that can be released from adsorption, realized the fine adjustment of toughened glass position without loosening clamping, avoided the damage caused by multiple clamping to glass surface.

Description

Technical Field

[0001] This utility model relates to the field of tempered glass processing technology, and in particular to a tempered glass positioning device. Background Technology

[0002] Tempered glass, a type of high-performance safety glass, is made by heating ordinary glass to near its softening point and then rapidly cooling it. Its strength is 3-5 times greater than that of ordinary glass, its impact resistance is significantly enhanced, and it breaks into small, blunt fragments, greatly reducing the risk of injury to the human body. Therefore, it is widely used in many fields such as building curtain walls, car windows, furniture tabletops, and electronic device screens.

[0003] In the processing of tempered glass, to meet the precision requirements of subsequent processes such as cutting, drilling, and edge grinding, precise positioning markings are necessary before processing. The typical procedure is as follows: first, the tempered glass is fixed using a clamping device, and then processing baselines or key positions are marked on the glass surface using a marker. Currently, the most common clamping method used in the industry is the jaw clamping method. Although this clamping method can achieve initial fixation of round tempered glass, the position of the glass is difficult to adjust flexibly after the jaw clamps are engaged. Since the contact part between the jaws and the glass is fixed, if there is a deviation in the initial placement of the glass, or if a slight displacement occurs during the clamping process, the jaws need to be loosened and re-clamped in order to correct the position. Repeated clamping can easily damage the glass surface. Utility Model Content

[0004] In order to overcome the defects of the prior art mentioned above, the inventors conducted in-depth research and, after a great deal of creative work, completed this utility model.

[0005] Specifically, the technical problem to be solved by this utility model is to provide a tempered glass positioning device to solve the technical problems of the current clamping method for holding round tempered glass, where the fixed contact part makes it difficult to flexibly adjust the glass position, and the need to loosen the clamps and re-clamp due to initial placement deviation or slight displacement during clamping, and repeated clamping can easily damage the glass surface.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A tempered glass positioning device includes a worktable and support legs. The worktable is provided with a clamping slide driven by a clamping mechanism. The worktable is also provided with a lifting mechanism for lifting the tempered glass. The lifting mechanism is also provided with a glass suction cup driven by a negative pressure pump. A marker body for positioning marks is installed above the worktable through a positioning mechanism. The clamping slide extends to one end of the worktable and has symmetrically distributed limiting grooves. The clamping slide slides along the circumference of the worktable through the limiting grooves. The top of the clamping slide also has a clearance groove for avoiding the main body of the marker pole. The end of the clamping slide that protrudes from the worktable is movably connected to a feeding roller and an adjusting roller, and the feeding roller and the adjusting roller are rotatably connected to the clamping slide via a horizontal rotating shaft and a vertical rotating shaft, respectively. The vertical rotating shaft is vertically installed on the clamping slide, and the horizontal rotating shaft and the vertical rotating shaft are perpendicular to each other.

[0007] As an improved technical solution, the clamping mechanism includes vertically distributed threaded columns, which are fixedly connected to the worktable. The end of the threaded column away from the worktable is threadedly connected to a lifting slide. A transmission link is provided between the lifting slide and the clamping slide. The bottom end of the transmission link is hinged to the lifting slide, and the top end of the transmission link is hinged to the end of the corresponding clamping slide that extends beyond the worktable. The transmission links are distributed in a circular array on the lifting slide around the threaded column as the center.

[0008] As an improved technical solution, the clamping mechanism also includes a clamping motor fixedly installed below the worktable. The output shaft of the clamping motor is connected to a drive gear, and the end of the threaded column near the worktable is provided with a driven gear that meshes with the drive gear.

[0009] As an improved technical solution, the lifting mechanism includes a lifting motor located at the bottom end of the threaded column, the lifting motor having reinforcing shafts distributed around it in a circumferential direction, and the lifting motor being fixedly connected to the corresponding support leg through the reinforcing shafts. The output shaft of the lifting motor is drivenly connected to a lifting rod, and the lifting rod is fixedly rotated in the threaded column through the lifting motor.

[0010] As an improved technical solution, the lifting mechanism further includes a lifting sleeve that is slidably connected to the worktable. The lifting sleeve has vertically distributed lifting grooves. The lifting sleeve is threadedly connected to one end of the lifting rod that extends to the outside of the threaded column through a threaded cavity. The bottom end of the lifting sleeve extends into the worktable. The lifting sleeve is fixedly installed with a lifting platform at one end away from the worktable, and the glass suction cups are distributed around the circumference of the lifting platform. The lifting platform is provided with a negative pressure interface that communicates with the glass suction cups. The negative pressure interface on the lifting platform is connected to a negative pressure pump through a pipe.

[0011] As an improved technical solution, the positioning mechanism includes a gantry slide mounted on the workbench, a positioning motor fixedly mounted on the gantry slide, a positioning screw drivenly connected to the output shaft of the positioning motor, the positioning screw being rotatably connected to the gantry slide via the positioning motor, a positioning slide seat for connecting to the main body of the marker being slidably connected on the gantry slide, and one end of the positioning screw located in the gantry slide being threadedly connected to the positioning slide seat.

[0012] As an improved technical solution, a scale shaft is also fixedly installed on the gantry carriage, which is parallel to the positioning screw. The positioning slide extends to one end of the gantry carriage and has a positioning hole that is clearance-fitted with the scale shaft. The positioning slide is slidably set along the axial direction of the scale shaft through the positioning hole.

[0013] After adopting the above technical solution, the beneficial effects of this utility model are: 1. This utility model, by setting a clamping slide that can slide around the worktable, together with a feeding roller and an adjusting roller, as well as a glass suction cup that can release the adsorption, enables fine adjustment of the position of tempered glass without loosening the clamp, avoiding damage to the glass surface caused by repeated clamping.

[0014] 2. This utility model, through the cooperation of the positioning motor, positioning screw, positioning slide and scale shaft in the positioning mechanism, as well as the design of the avoidance groove on the clamping slide, ensures that the main body of the marker can be accurately moved to the designated position and successfully completed the marking, while avoiding collision with the clamping slide and obstruction of the glass.

[0015] 3. This utility model, by allowing modification of the number, layout, and transmission link length of the clamping slides, can adapt to the clamping and positioning requirements of tempered glass of different shapes, thus enhancing the versatility and flexibility of the device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a three-dimensional structural diagram of the tempered glass positioning device of this utility model.

[0017] Figure 2 This is a cross-sectional structural diagram of the tempered glass positioning device of this utility model.

[0018] Figure 3 This is a schematic diagram of the clamping mechanism and the worktable surface of this utility model.

[0019] Figure 4 This is a schematic diagram of the clamping mechanism of this utility model.

[0020] Figure 5 This is a schematic diagram of the clamping slide structure of this utility model.

[0021] Figure 6 This is a schematic diagram of the installation structure of the lifting sleeve and the lifting platform of this utility model.

[0022] Figure 7 For the present utility model Figure 2 A magnified structural diagram of part A.

[0023] Explanation of reference numerals in the attached figures: 1. Worktable; 2. Support legs; 3. Clamping slide; 301. Limiting groove; 302. Clearance groove; 4. Feeding roller; 401. Horizontal rotating shaft; 5. Adjusting rotating wheel; 501. Longitudinal rotating shaft; 6. Threaded column; 601. Driven gear; 7. Lifting slide; 8. Transmission connecting rod; 9. Clamping motor; 901. Drive gear; 10. Lifting motor; 1001. Reinforcing shaft; 1002. Lifting rotating rod; 11. Lifting sleeve; 1101. Lifting groove; 1102. Threaded cavity; 12. Lifting platform; 1201. Glass suction cup; 13. Gantry slide; 1301. Scale shaft; 14. Positioning motor; 1401. Positioning screw; 15. Positioning slide; 16. Scale body. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Example 1

[0025] like Figures 1 to 7As shown in the figure, this embodiment provides a tempered glass positioning device, which includes a worktable 1 and support legs 2. The worktable 1 is provided with a clamping slide 3 driven by a clamping mechanism. The worktable 1 is also provided with a lifting mechanism for lifting the tempered glass. The lifting mechanism is also provided with a glass suction cup 1201 driven by a negative pressure pump. A marker body 16 for positioning is installed above the worktable 1 through a positioning mechanism. The clamping slide 3 extends into the worktable 1 and has symmetrically distributed limiting grooves 301 at one end. The clamping slide 3 extends along the worktable 1 through the limiting grooves 301. The clamping slide 3 has a circumferential sliding arrangement, and its top end is provided with a clearance groove 302 to avoid the main body 16 of the marker pole. One end of the clamping slide 3 protruding from the worktable 1 is movably connected to a feeding roller 4 and an adjusting roller 5. The feeding roller 4 and the adjusting roller 5 are rotatably connected to the clamping slide 3 via a horizontal rotating shaft 401 and a longitudinal rotating shaft 501, respectively. The longitudinal rotating shaft 501 is vertically mounted on the clamping slide 3, and the horizontal rotating shaft 401 and the longitudinal rotating shaft 501 are perpendicular to each other. The support leg 2 provides stable support for the worktable 1. The clamping slide 3 can be driven by the clamping mechanism to operate... The center of the worktable 1 is centered on the edges of the worktable to clamp and fix the tempered glass. The lifting mechanism can lift the tempered glass a certain height off the worktable 1, making it convenient for the clamping slide 3 to clamp it, while also preventing the glass from directly contacting the worktable 1 and causing wear. The marker body 16 can move precisely under the drive of the positioning mechanism, thereby completing the positioning and marking work of the tempered glass. The limiting groove 301 can limit the sliding direction of the clamping slide 3, ensuring its sliding stability and accuracy, preventing longitudinal displacement, and thus ensuring the accuracy of the clamping position. The clearance groove 302 can prevent... During the positioning process of the main body 16, the clamping slide 3 shields the tempered glass, ensuring the independence and safety of both working. The feeding roller 4 facilitates the smooth movement of the tempered glass to the designated position during the feeding process, reducing friction during feeding. The adjusting wheel 5 can fine-tune the position of the glass during the clamping process, and the adjusting wheel 5 is provided with an annular groove adapted to the thickness of the tempered glass. The distribution of the horizontal rotating shaft 401 and the vertical rotating shaft 501 allows the feeding roller 4 and the adjusting wheel 5 to act on the glass in different directions, improving the flexibility of glass position adjustment.

[0026] The clamping mechanism includes vertically distributed threaded columns 6, which are fixedly connected to the worktable 1. A lifting slide 7 is threadedly connected to the end of the threaded column 6 furthest from the worktable 1. A transmission link 8 is provided between the lifting slide 7 and the clamping slide 3. The bottom end of the transmission link 8 is hinged to the lifting slide 7, and the top end of the transmission link 8 is hinged to the corresponding end of the clamping slide 3 extending beyond the worktable 1. The transmission links 8 are arranged in a circular array around the threaded columns 6 on the lifting slide 7. The threaded columns 6 can rotate stably under the worktable 1 via bearing seats. When the lifting slide 7 moves up and down along the threaded columns 6, the transmission links 8 drive the clamping slide 3 to slide circumferentially along the worktable 1, thereby driving the clamping slide 3 and completing the clamping or releasing action of the glass. The distribution of the transmission links 8 allows different clamping slides 3 to slide synchronously, ensuring uniform force when clamping the glass, guaranteeing the stability of the glass clamping, and preventing the glass from shifting during processing.

[0027] The clamping mechanism also includes a clamping motor 9 fixedly installed below the worktable 1. The output shaft of the clamping motor 9 is connected to a drive gear 901. The threaded column 6 is provided with a driven gear 601 that meshes with the drive gear 901 at one end near the worktable 1. When the clamping motor 9 is started, the drive gear 901 rotates and drives the threaded column 6 to rotate through meshing with the driven gear 601, thereby realizing the lifting and lowering of the lifting slide 7 and finally completing the clamping operation of the clamping slide 3 on the glass.

[0028] The lifting mechanism includes a lifting motor 10 located at the bottom of the threaded column 6. The lifting motor 10 has reinforcing shafts 1001 distributed around it in a circumferential direction. The lifting motor 10 is fixedly connected to the corresponding support leg 2 through the reinforcing shafts 1001. The output shaft of the lifting motor 10 is driven by a lifting rod 1002, which is fixedly connected to the threaded column 6 through the lifting motor 10. The lifting motor 10 provides power for the operation of the lifting mechanism. The reinforcing shaft 1001 can enhance the stability of the installation of the lifting motor 10 and prevent it from shaking during operation. After the lifting motor 10 is started, it can drive the lifting rod 1002 to rotate, providing power for the subsequent lifting of the lifting sleeve 11. Since the lifting rod 1002 is driven by the lifting motor 10, it is independent of the threaded column 6 and does not interfere with it. Even if the threaded column 6 rotates due to the start of the clamping motor 9, the lifting rod 1002 will not rotate when the lifting motor 10 is not started.

[0029] The lifting mechanism also includes a lifting sleeve 11 slidably connected to the worktable 1. Vertically distributed lifting grooves 1101 are provided on the lifting sleeve 11. The lifting sleeve 11 is threadedly connected to one end of the lifting rod 1002 extending to the threaded post 6 via a threaded cavity 1102. The bottom end of the lifting sleeve 11 extends into the worktable 1. A lifting platform 12 is fixedly installed at the end of the lifting sleeve 11 away from the worktable 1, and glass suction cups 1201 are distributed circumferentially along the lifting platform 12. The lifting platform 12 is provided with a negative pressure interface communicating with the glass suction cups 1201. The negative pressure interface on the lifting platform 12 is connected to a negative pressure pump via a pipe. The lifting grooves 1101 can adjust the lifting sleeve 11. The lifting mechanism 1 serves as a guide, ensuring the verticality of its lifting and preventing displacement or rotation in other directions. When the lifting rod 1002 rotates, the lifting sleeve 11 can rise and fall along the axial direction of the lifting rod 1002 under the action of the threaded engagement. The lifting platform 12 is lifted and lowered under the drive of the lifting sleeve 11. The glass suction cup 1201 can firmly adsorb the tempered glass onto the lifting platform 12 through negative pressure, further ensuring the stability of the glass during processing. The negative pressure pump can provide negative pressure to the glass suction cup 1201 through pipes and negative pressure interfaces to ensure the adsorption effect of the glass suction cup 1201. During fine adjustment, the adsorption of the tempered glass can be released by removing the negative pressure.

[0030] The positioning mechanism includes a gantry slide 13 mounted on the worktable 1. A positioning motor 14 is fixedly mounted on the gantry slide 13. The output shaft of the positioning motor 14 is driven by a positioning screw 1401. The positioning screw 1401 is rotatably connected to the gantry slide 13 through the positioning motor 14. A positioning slide 15 for connecting to the target body 16 is slidably connected to the gantry slide 13. One end of the positioning screw 1401 located in the gantry slide 13 is threadedly connected to the positioning slide 15. The gantry slide 13 is U-shaped and fixedly mounted on the worktable 1. The positioning motor 14 provides power for the operation of the positioning mechanism. When the positioning motor 14 starts, it drives the positioning screw 1401 to rotate. Under the action of the threaded engagement, the positioning slide 15 can slide along the gantry slide 13, thereby driving the target body 16 to move and realize the position adjustment of the target body 16.

[0031] The gantry carriage 13 is also fixedly installed with a scale shaft 1301 that is parallel to the positioning screw 1401. The positioning slide 15 extends to the outer end of the gantry carriage 13 and has a positioning hole that is clearance-fitted with the scale shaft 1301. The positioning slide 15 slides along the axial direction of the scale shaft 1301 through the positioning hole. The scale shaft 1301 can be set with a scale to facilitate the operator to observe the movement distance of the positioning slide 15, thereby more accurately controlling the position of the main body 16 of the pole. The cooperation between the positioning hole and the scale shaft 1301 can guide and limit the sliding of the positioning slide 15 to a certain extent, ensuring its linearity and stability, and further improving the positioning accuracy of the main body 16 of the pole.

[0032] During the positioning and processing of the tempered glass using this device, the operator places the tempered glass on the worktable 1 and drives the lifting motor 10 to rotate. Its output shaft drives the lifting rod 1002 to rotate. Since the lifting sleeve 11 is threadedly engaged with the lifting rod 1002 through the threaded cavity 1102, and the lifting groove 1101 restricts the lifting direction of the lifting sleeve 11, the lifting sleeve 11 rises axially along the lifting rod 1002, thereby driving the lifting platform 12 at the top to rise synchronously. After the lifting platform 12 contacts the glass, it continues to rise, lifting the tempered glass a certain height away from the worktable 1 to avoid direct contact between the glass and the worktable 1 and cause wear. At the same time, it makes room for the subsequent clamping operation of the clamping slide 3. Then, the negative pressure pump provides negative pressure to the glass suction cup 1201 through the pipeline and the negative pressure interface on the lifting platform 12, so that the glass suction cup 1201 firmly adsorbs the tempered glass and initially fixes the position of the glass. Then, the clamping mechanism is activated, and the clamping motor 9 operates. The output shaft drives the drive gear 901 to rotate. The drive gear 901 meshes with the driven gear 601 on the threaded column 6, driving the threaded column 6 to rotate stably on the worktable 1 through the bearing seat. When the threaded column 6 rotates, the lifting slide 7, which is threaded to it, descends along the axial direction of the threaded column 6. Through the transmission connecting rods 8 distributed in a ring array, the clamping slide 3 slides circumferentially along the worktable 1, and the limiting groove 301 ensures that the sliding direction is stable. Multiple clamping slides 3 are positioned horizontally on the worktable. The center of the glass is close to each other, and the annular groove of the adjusting wheel 5 at its protruding end contacts the edge of the tempered glass to further clamp and fix the glass. If there is a slight deviation in the position of the glass, the negative pressure pump stops working and releases the adsorption of the glass suction cup 1201. The feeding roller 4 and the adjusting wheel 5, which are correspondingly connected by the horizontal rotating shaft 401 and the longitudinal rotating shaft 501 distributed in different directions, reduce the friction when the glass moves by means of their rolling characteristics. Thus, the position can be corrected without loosening the clamp and avoid damage to the glass surface caused by repeated clamping. When the tempered glass is adsorbed again by the glass suction cup 1201, the positioning motor 14 on the gantry carriage 13 operates, driving the positioning screw 1401 to rotate. The positioning slide 15, which is threaded with the positioning screw 1401, slides along the gantry carriage 13. The linearity and stability of the slide are ensured by the cooperation between the scale shaft 1301 and the positioning hole, thereby moving the marker body 16 to the designated position. The clearance groove 302 at the top of the clamping slide 3 prevents the marker body 16 from colliding with the clamping slide 3 when it moves, and also prevents the clamping slide 3 from obstructing the glass and affecting the marking. The operator can accurately control the position of the marker body 16 through the scale of the scale shaft 1301 and use the marker body 16 to complete the positioning mark on the surface of the tempered glass. In this embodiment of the device, the number and ring layout of the clamping slides 3 are designed for round tempered glass. In other embodiments, the number and layout of the clamping slides 3 and the length of the transmission link 8 can be modified to achieve clamping and positioning of tempered glass of different shapes, such as square and semi-circular.

[0033] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A tempered glass positioning device, characterized in that: It includes a worktable (1) and a support leg (2). The worktable (1) is provided with a clamping slide (3) driven by a clamping mechanism. The worktable (1) is also provided with a lifting mechanism for lifting tempered glass. The lifting mechanism is also provided with a glass suction cup (1201) driven by a negative pressure pump. A marker body (16) for positioning marks is installed above the worktable (1) through a positioning mechanism. The clamping slide (3) extends to one end of the workbench (1) and is provided with symmetrically distributed limiting grooves (301). The clamping slide (3) slides along the circumference of the workbench (1) through the limiting grooves (301). The top of the clamping slide (3) is also provided with a clearance groove (302) for avoiding the main body of the marker (16). The end of the clamping slide (3) protruding from the worktable (1) is movably connected to the feeding roller (4) and the adjusting roller (5), and the feeding roller (4) and the adjusting roller (5) are rotatably connected to the clamping slide (3) through the horizontal rotating shaft (401) and the longitudinal rotating shaft (501), respectively. The longitudinal rotating shaft (501) is vertically installed on the clamping slide (3), and the horizontal rotating shaft (401) and the longitudinal rotating shaft (501) are perpendicular to each other.

2. The tempered glass positioning device according to claim 1, characterized in that: The clamping mechanism includes vertically distributed threaded columns (6), which are fixedly connected to the worktable (1). The end of the threaded column (6) away from the worktable (1) is threadedly connected to a lifting slide (7). A transmission link (8) is provided between the lifting slide (7) and the clamping slide (3). The bottom end of the transmission link (8) is hinged to the lifting slide (7), and the top end of the transmission link (8) is hinged to the end of the corresponding clamping slide (3) extending outside the worktable (1). The transmission links (8) are arranged in a ring array around the threaded column (6) on the lifting slide (7).

3. The tempered glass positioning device according to claim 2, characterized in that: The clamping mechanism also includes a clamping motor (9) fixedly installed below the worktable (1). The output shaft of the clamping motor (9) is connected to a drive gear (901). The threaded column (6) is provided with a driven gear (601) that meshes with the drive gear (901) at one end near the worktable (1).

4. The tempered glass positioning device according to claim 1, characterized in that: The lifting mechanism includes a lifting motor (10) located at the bottom of the threaded column (6). The lifting motor (10) has reinforcing shafts (1001) distributed around it in a circumferential direction. The lifting motor (10) is fixedly connected to the corresponding support leg (2) through the reinforcing shafts (1001). The output shaft of the lifting motor (10) is connected to a lifting rod (1002), and the lifting rod (1002) is fixedly connected to the threaded column (6) through the lifting motor (10).

5. The tempered glass positioning device according to claim 4, characterized in that: The lifting mechanism also includes a lifting sleeve (11) that is slidably connected to the worktable (1). The lifting sleeve (11) has vertically distributed lifting grooves (1101). The lifting sleeve (11) is threadedly connected to one end of the lifting rod (1002) that extends to the threaded column (6) through a threaded cavity (1102). The bottom end of the lifting sleeve (11) extends into the worktable (1). The lifting sleeve (11) is fixedly installed with a lifting platform (12) at one end away from the worktable (1), and the glass suction cup (1201) is distributed around the lifting platform (12). The lifting platform (12) is provided with a negative pressure interface that communicates with the glass suction cup (1201). The negative pressure interface on the lifting platform (12) is connected to a negative pressure pump through a pipe.

6. The tempered glass positioning device according to claim 1, characterized in that: The positioning mechanism includes a gantry slide (13) mounted on a workbench (1). A positioning motor (14) is fixedly mounted on the gantry slide (13). The output shaft of the positioning motor (14) is connected to a positioning screw (1401). The positioning screw (1401) is rotatably connected to the gantry slide (13) through the positioning motor (14). A positioning slide (15) for connecting to the main body (16) of the marker is slidably connected on the gantry slide (13). One end of the positioning screw (1401) located in the gantry slide (13) is threadedly connected to the positioning slide (15).

7. The tempered glass positioning device according to claim 6, characterized in that: The gantry slide (13) is also fixedly installed with a scale shaft (1301) that is parallel to the positioning screw (1401), and the positioning slide (15) extends to the outer end of the gantry slide (13) and has a positioning hole that is clearance-fitted with the scale shaft (1301). The positioning slide (15) slides along the axial direction of the scale shaft (1301) through the positioning hole.

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