Spring tube fixed-length cutting device

Abstract

The utility model discloses a spring tube fixed length cutting device belongs to cutting equipment technical field. Including organism, the rear of the upper end of organism is provided with wire cutting assembly, is used for cutting spring tube, the front of the upper end of organism is provided with the translation component translation component and is provided with bearing mechanism, the bearing mechanism includes the installation platform of installation in the upper end of translation component, the upper end of installation platform is installed with support frame, and the guidance component is installed in one side of support frame, is used for guiding the conveying of spring tube. A kind of spring tube fixed length cutting device of the application, by the visual positioning of adjusting sleeve in fixed length component through one-way screw rod sliding, cooperate indicating board and scale line, it is convenient to control length adjustment, the length of arc-shaped pressing plate and adjusting bolt composition's limiting portion, can be fixed after spring tube reaches adjusting sleeve secondary, reduce the position deviation caused by spring tube's own elastic deformation, improve the length accuracy of each cutting.

Description

Technical Field

[0001] This utility model relates to the field of cutting equipment technology, specifically a spring tube fixed-length cutting device. Background Technology

[0002] In the field of medical device manufacturing, Bourdon tubes are widely used as key structural components in products such as endoscopes and catheter-based interventional devices. These Bourdon tubes typically require high-precision dimensional specifications, as their length errors directly affect the assembly accuracy, safety, and functional stability of medical devices. For example, if the length deviation of the Bourdon tube in an endoscope exceeds the allowable range, it may cause lens adjustment jamming, inaccurate insertion depth control, or even device compatibility failures during clinical operation. Therefore, high requirements are placed on the precise length cutting of Bourdon tubes.

[0003] For example, the patent with publication number CN221494513U discloses a spring tube cutting device, including an installation platform, a support frame, a cutting component, a translation component, and a carrier. The technical effect of this utility model is that it makes the end face of the spring tube more flush.

[0004] In the aforementioned patent, the cutting device does not have a dedicated length-fixing mechanism. Operators need to first measure the length of the spring tube to be cut using tools such as rulers and calipers, mark the surface of the tube, manually align the marked area with the cutting component, and then start the equipment to complete the cutting. Visual errors, hand tremors, and the elastic deformation of the spring tube itself during manual measurement may lead to deviations in the cutting length. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a spring tube fixed length cutting device.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a spring tube fixed length cutting device, including a machine body, a wire cutting component is provided at the rear of the upper end of the machine body for cutting spring tubes, a translation component is provided at the front of the upper end of the machine body, a bearing mechanism is provided on the translation component, the bearing mechanism includes an installation platform installed on the upper end of the translation component, and a support frame is installed on the upper end of the installation platform; A guide assembly, mounted on one side of the support frame, is used to guide the transport of the spring tube; A clamping assembly, which is installed at the upper end of the support frame, is used to clamp and position the spring tube; A length-determining component, installed on the other side of the support frame, is used to determine the cutting length of the spring tube.

[0007] Furthermore, the fixed-length assembly includes a second support plate installed on the outer wall of the other side of the support frame. A second mounting plate is installed on the upper end of the second support plate, and a second arc-shaped guide plate is installed on the upper end of the second mounting plate. A one-way screw is threaded onto one side of the second arc-shaped guide plate. An adjusting sleeve is slidably sleeved on the outer wall of the second arc-shaped guide plate. The spring tube is located inside the adjusting sleeve. A connecting sleeve is installed on the outer wall of one side of the adjusting sleeve. One end of the one-way screw is rotatably installed in the connecting sleeve. A third handle is installed on the other end of the one-way screw. A limit part is provided on the second arc-shaped guide plate.

[0008] Furthermore, an indicator plate is installed at the lower end of the adjusting sleeve, and a scale line is provided in the middle of the upper end of the second support plate, with the indicator plate corresponding to the scale line.

[0009] Furthermore, the limiting part includes an arc-shaped pressure plate rotatably mounted on one side of the middle part of the second arc-shaped guide plate. An adjusting bolt is threaded onto the arc-shaped pressure plate, and the arc-shaped pressure plate is mounted on the second arc-shaped guide plate by the adjusting bolt when it is engaged.

[0010] Furthermore, the guiding assembly includes a first support plate mounted on one side of the support frame. A mounting bracket is mounted on the upper end of the first support plate. A plurality of first guide wheels are rotatably mounted on the lower end of the mounting bracket. A drive motor is mounted on one side of the mounting bracket. The output end of the drive motor passes through the mounting bracket and is connected to one of the first guide wheels. An adjusting block is slidably mounted inside the mounting bracket. A second guide wheel is rotatably mounted on the lower end of the adjusting block. A circular channel for conveying the spring tube is formed between the first guide wheel and the second guide wheel. An adjusting rod is threadedly mounted on the middle of the upper end of the mounting bracket. The lower end of the adjusting rod is rotatably mounted inside the adjusting block. A first handle is mounted on the upper end of the adjusting rod.

[0011] Furthermore, a first mounting plate is installed at the middle of the upper end of the support frame, and a first arc-shaped guide plate is installed at the upper end of the first mounting plate.

[0012] Furthermore, the clamping assembly includes bidirectional lead screws rotatably mounted on both sides of the upper end of the support frame. Clamping blocks are threaded onto the outer walls of both ends of the two bidirectional lead screws. The lower ends of the clamping blocks are slidably mounted on the support frame. Each clamping block is provided with an airbag. A second handle is installed at one end of each of the two bidirectional lead screws.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects: the adjusting sleeve in the fixed length component slides through the one-way lead screw, and with the visual positioning of the indicator plate and scale line, it is convenient to control the length adjustment. The limiting part composed of the arc-shaped pressure plate and the adjusting bolt can be fixed again after the spring tube touches the adjusting sleeve, reducing the positional displacement caused by the elastic deformation of the spring tube itself and improving the length accuracy of each cut. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the principle of this utility model; Figure 2 This is a schematic diagram of the right-side structure of this utility model; Figure 3 This is a schematic diagram of the guiding component, clamping component, and length-fixing component of this utility model; Figure 4 This is a left-side structural schematic diagram of the guide assembly, clamping assembly, and length-fixing assembly of this utility model; Figure 5 for Figure 3 Enlarged view of point A in the middle; Figure 6 for Figure 4 Enlarged view of point B in the middle.

[0015] The following are the labeling elements in the figure: 1. Machine body; 2. Wire cutting assembly; 3. Translation assembly; 31. Mounting platform; 32. Support frame; 4. Guide assembly; 41. First support plate; 42. Mounting frame; 43. First guide wheel; 44. Adjusting block; 45. Second guide wheel; 46. Adjusting rod; 47. First handle; 48. Drive motor; 49. First mounting plate; 410. First arc-shaped guide plate; 5. Clamping assembly; 51. Two-way lead screw; 52. Clamping block; 53. Airbag; 54. Second handle; 6. Length fixing assembly; 61. Second support plate; 62. Second mounting plate; 63. Second arc-shaped guide plate; 64. One-way lead screw; 65. Adjusting sleeve; 66. Connecting sleeve; 67. Indicator plate; 68. Scale line; 69. Arc-shaped pressure plate; 610. Adjusting bolt; 611. Third handle. Detailed Implementation

[0016] This utility model provides a method that, with the aid of those skilled in the art, can be implemented by appropriately modifying process parameters. It is particularly important to note that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of protection of this utility model. The method and application of this utility model have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately alter and combine the method and application described herein without departing from the content, spirit, and scope of this utility model to implement and apply the technology of this utility model.

[0017] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Example 1: As Figure 1 - Figure 2 As shown, this application provides a spring tube length-cutting device, including a body 1 as an overall supporting base. A wire cutting assembly 2 is disposed at the rear of the upper end of the body 1 for cutting the spring tube. A translation assembly 3 is disposed at the front of the upper end of the body 1 for driving the spring tube through the wire cutting assembly 2 for cutting. Both the wire cutting assembly 2 and the translation assembly 3 are existing mature technologies and therefore will not be described in detail. The two work together to achieve the cutting of the spring tube: the translation assembly 3 drives the spring tube to move precisely to the cutting area of ​​the wire cutting assembly 2, and the wire cutting assembly 2 starts to complete the cutting, providing the basic cutting conditions for subsequent length-cutting, guiding, and other functions. like Figure 2 - Figure 3 As shown, the translation component 3 is provided with a support mechanism, which includes a mounting platform 31 fixedly installed on the upper end of the translation component 3. The mounting platform 31 provides a stable mounting carrier for the support frame 32. The upper end of the mounting platform 31 is fixedly installed with the support frame 32. The support frame 32 serves as an integrated mounting frame for components such as guide, clamp, and length setting. A gap is left in the middle for the cutting line of the wire cutting component 2 to pass through. This gap ensures that the cutting line can pass smoothly through the support frame 32 to cut the spring tube, avoids interference between the support frame 32 and the cutting line, and ensures a smooth cutting process. like Figure 3 As shown, a guide assembly 4 for guiding the stable transport of the spring tube is provided on one side of the support frame 32. The guide assembly 4 includes a first support plate 41 fixedly installed on one side of the support frame 32. A mounting frame 42 is fixedly installed on the upper end of the first support plate 41. Multiple first guide wheels 43 are rotatably installed on the lower end of the mounting frame 42. A drive motor 48 is fixedly installed on one side of the mounting frame 42. The output end of the drive motor 48 passes through the mounting frame 42 and is fixedly connected to one of the first guide wheels 43. When the drive motor 48 is started, the motor output end drives the first guide wheel 43 to rotate. Through the friction between the spring tube and the guide wheel, a forward transport force is generated on the spring tube, thereby realizing the automatic transport of the spring tube. An adjusting block 44 is slidably installed inside the mounting bracket 42. A second guide wheel 45 is rotatably installed at the lower end of the adjusting block 44. A circular channel for conveying the spring tube is formed between the first guide wheel 43 and the second guide wheel 45. The circular channel is adapted to the shape of the spring tube to ensure that the spring tube does not deviate during conveying. An adjusting rod 46 is threadedly installed in the middle of the upper end of the mounting bracket 42. The lower end of the adjusting rod 46 is rotatably installed inside the adjusting block 44. A first handle 47 is fixedly installed at the upper end of the adjusting rod 46.

[0019] When the diameters of the spring tubes are different, turning the first handle 47 causes the adjusting rod 46 to rotate around its own axis. Since the adjusting rod 46 is threadedly connected to the mounting bracket 42, the rotational motion is converted into the axial movement of the adjusting rod 46, which in turn causes the adjusting block 44 to slide up and down along the mounting bracket 42, changing the distance between the second guide wheel 45 and the first guide wheel 43, so that the circular channel can be adapted to spring tubes of different diameters, ensuring that the spring tubes are stably clamped and not squeezed or deformed during transportation. A first mounting plate 49 is fixedly installed at the middle of the upper end of the support frame 32. The first mounting plate 49 provides fixed support for the first arc-shaped guide plate 410. The first arc-shaped guide plate 410 is fixedly installed at the upper end of the first mounting plate 49. Its arc-shaped structure fits against the outer wall of the spring tube. On the one hand, it can provide bottom support for the spring tube during the conveying process, and prevent the spring tube from sagging due to its own weight, which would cause the conveying trajectory to deviate. On the other hand, the arc-shaped inner wall can guide the conveying direction of the spring tube, ensuring that the spring tube moves stably along the preset path to the subsequent clamping and cutting area, and cooperates with the guide component 4 to form a continuous conveying channel, thereby improving the conveying stability. like Figure 3 As shown, the upper end of the support frame 32 is provided with a clamping assembly 5 for clamping and positioning the spring tube, preventing the spring tube from shifting during cutting and affecting the cutting accuracy. The clamping assembly 5 includes a double-acting lead screw 51 rotatably mounted on both sides of the upper end of the support frame 32. The surface of the double-acting lead screw 51 is machined with threads of opposite left and right helix directions. Clamping blocks 52 are threadedly installed on the outer walls of both ends of the two double-acting lead screws 51. The lower ends of the clamping blocks 52 are slidably mounted on the support frame 32. The support frame 32 guides and limits the clamping blocks 52, preventing the clamping blocks 52 from deflecting when they rotate with the lead screw, and ensuring that the clamping blocks 52 move only along the axial direction of the lead screw. Each clamping block 52 is provided with an air bladder 53. The air bladder 53 is elastic and can avoid damage to the spring tube by rigid clamping. Each of the two bidirectional lead screws 51 has a second handle 54 fixedly installed at one end. When the second handle 54 is rotated, the bidirectional lead screw 51 is driven to rotate around its own axis. Since the threads at both ends of the lead screw have opposite directions, the clamping blocks 52 on both sides move closer or further apart under the action of the threads. When the spring tube is conveyed to the cutting position, the second handle 54 is rotated to make the clamping blocks 52 move closer together until the air bladder 53 is tightly attached to the outer wall of the spring tube. The elastic pressure of the air bladder 53 firmly fixes the spring tube, which not only prevents the spring tube from shaking during cutting, but also protects the surface of the spring tube from damage, providing stable positioning for precise cutting. Example 2: Figure 4 - Figure 6As shown, a length-fixing component 6 is provided on the other side of the support frame 32 to determine the cutting length of the spring tube, ensuring that the cut spring tubes are of consistent length. The length-fixing component 6 includes a second support plate 61 fixedly installed on the outer wall of the other side of the support frame 32. A second mounting plate 62 is fixedly installed on the upper end of the second support plate 61, and a second arc-shaped guide plate 63 is fixedly installed on the upper end of the second mounting plate 62. A gap is left between the first arc-shaped guide plate 410 and the second arc-shaped guide plate 63 for the cutting line of the wire cutting component 2 to pass through. This gap corresponds to the cutting line interval in the middle of the support frame 32, ensuring that the cutting line can pass smoothly to cut the spring tube between the two guide plates. After the spring tube is cut, it needs to be manually removed and then the subsequent spring tubes are guided onto the second arc-shaped guide plate 63. The second arc-shaped guide plate 63 has the same structure as the first arc-shaped guide plate 410 and also plays a supporting and guiding role, ensuring that the subsequent spring tubes can continue to be transported along a stable path after cutting, in preparation for the next fixed-length cutting. like Figure 5 - Figure 6 As shown, a one-way lead screw 64 is threadedly installed on one side of the second arc-shaped guide plate 63. An adjusting sleeve 65 is slidably sleeved on the outer wall of the second arc-shaped guide plate 63. A spring tube can be inserted into the adjusting sleeve 65. The adjusting sleeve 65 can limit the end point of the spring tube's conveying, thereby determining the cutting length. A connecting sleeve 66 is fixedly installed on the outer wall of one side of the adjusting sleeve 65. One end of the one-way lead screw 64 is rotatably installed in the connecting sleeve 66. A third handle 611 is fixedly installed on the other end of the one-way lead screw 64. When the third handle 611 is rotated, the one-way lead screw 64 rotates around its own axis. Since the lead screw is threadedly connected to the second arc-shaped guide plate 63, the rotational motion is converted into the axial movement of the lead screw, which in turn drives the adjusting sleeve 65 to slide along the second arc-shaped guide plate 63 through the connecting sleeve 66, changing the position of the adjusting sleeve 65. An indicator plate 67 is fixedly installed at the lower end of the adjusting sleeve 65. A scale line 68 is set in the middle of the upper end of the second support plate 61. The indicator plate 67 corresponds to the scale line 68. The operator can adjust the position of the adjusting sleeve 65 by the scale value aligned with the indicator plate 67, thereby changing the conveying distance of the spring tube and achieving the purpose of adjusting and cutting spring tubes of different lengths, realizing the visualization and precision of fixed length. The second arc-shaped guide plate 63 is provided with a limiting part, which includes an arc-shaped pressure plate 69 rotatably installed on one side of the middle of the second arc-shaped guide plate 63. An adjusting bolt 610 is threaded on the arc-shaped pressure plate 69. When the spring tube is conveyed to the adjusting sleeve 65 (reaching the preset length), the arc-shaped pressure plate 69 is rotated to lock onto the spring tube, and the adjusting bolt 610 is tightened to fix the arc-shaped pressure plate 69 on the second arc-shaped guide plate 63. The cooperation between the arc-shaped pressure plate 69 and the guide plate provides secondary limiting for the spring tube, further preventing the spring tube from shifting during cutting and ensuring the fixed length accuracy.

[0020] The working principle of this utility model is as follows: First, rotate the third handle 611 of the one-way lead screw 64 in the length-fixing assembly 6. The one-way lead screw 64 rotates around its own axis. Because the lead screw is threadedly connected to the second arc-shaped guide plate 63, the rotational motion is converted into axial movement, which drives the adjusting sleeve 65 to slide along the second arc-shaped guide plate 63 through the connecting sleeve 66. The indicator plate 67 at the lower end of the adjusting sleeve 65 moves synchronously with the adjusting sleeve 65. By observing the corresponding position of the indicator plate 67 and the scale line 68 on the second support plate 61, the position of the adjusting sleeve 65 at this time is the end point of the spring tube conveying. By limiting the conveying distance of the spring tube by the adjusting sleeve 65, the fixed length parameter is preset. After the adjustment is completed, keep the position of the adjusting sleeve 65 fixed to prepare the length benchmark for subsequent cutting. Then, the guide assembly 4 is activated to transport the spring tube. First, the guide wheel spacing is adjusted according to the spring tube diameter. The first handle 47 is turned to drive the adjusting rod 46 to rotate. The threaded engagement between the adjusting rod 46 and the mounting bracket 42 causes the adjusting rod 46 to move axially, which in turn drives the adjusting block 44 to slide up and down along the mounting bracket 42, changing the spacing between the second guide wheel 45 and the first guide wheel 43 so that the circular channel formed by the two matches the spring tube diameter.

[0021] Then, the drive motor 48 is started, and the motor output drives one of the first guide wheels 43 to rotate. Through the friction between the spring tube and the first and second guide wheels 45, the spring tube is driven forward along the circular channel. During the conveying process, the first arc-shaped guide plate 410 in the middle of the support frame 32 provides bottom support for the spring tube, and at the same time, the arc-shaped inner wall guides the spring tube to move along the preset path until one end of the spring tube touches the adjusting sleeve 65 of the fixed length component 6, at which point the conveying temporarily stops.

[0022] Once the spring tube has been fed to the preset length, the second handle 54 of the clamping assembly 5 is rotated to drive the bidirectional lead screws 51 on both sides to rotate. The threads at both ends of the bidirectional lead screws 51 turn in opposite directions, and the lower end of the clamping block 52 is guided and limited by the support frame 32. Therefore, when the lead screw rotates, the clamping blocks 52 on both sides move closer to the middle synchronously until the air bladder 53 on the clamping block 52 is tightly attached to the outer wall of the spring tube. The elastic properties of the air bladder 53 can firmly fix the spring tube with pressure to prevent shaking during cutting, and can also avoid rigid contact damage to the surface of the spring tube, providing stable positioning for precise cutting. At the same time, the arc-shaped pressure plate 69 on the second arc-shaped guide plate 63 is rotated to engage with the spring tube, and the adjusting bolt 610 is tightened to fix the arc-shaped pressure plate 69, which provides secondary positioning of the spring tube and further improves the positioning stability. After clamping and positioning, the translation component 3 and the wire cutting component 2 work together to move the portion of the spring tube located between the first arc-shaped guide plate 410 and the second arc-shaped guide plate 63 (the area to be cut) to the cutting area of ​​the wire cutting component 2. At this time, the wire cutting component 2 starts, and the cutting wire passes through the gap in the middle of the support frame 32 and the gap between the first arc-shaped guide plate 410 and the second arc-shaped guide plate 63 to cut the spring tube. During the cutting process, the translation component 3 maintains a stable position to ensure that the cutting wire cuts the spring tube along a preset trajectory, completing one fixed-length cut. After the spring tube is cut, first loosen the clamping assembly 5, then rotate the second handle 54 in the opposite direction to move the clamping block 52 away from the spring tube. Loosen the adjusting bolt 610 of the arc-shaped pressure plate 69 and flip the pressure plate. Manually remove the cut spring tube from the second arc-shaped guide plate 63. Then, restart the drive motor 48 of the guide assembly 4 to continue feeding the subsequent spring tubes to be cut forward until one end touches the adjusting sleeve 65, thus achieving continuous cutting.

[0023] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A spring tube fixed-length cutting device, comprising a body (1), wherein a wire cutting assembly (2) is provided at the rear of the upper end of the body (1) for cutting spring tubes, and a translation assembly (3) is provided at the front of the upper end of the body (1), wherein a carrying mechanism is provided on the translation assembly (3), characterized in that: The bearing mechanism includes an installation platform (31) installed on the upper end of the translation component (3), and a support frame (32) is installed on the upper end of the installation platform (31). A guide assembly (4), which is mounted on one side of the support frame (32), is used to guide the transport of the spring tube; The clamping assembly (5) is installed at the upper end of the support frame (32) and is used to clamp and position the spring tube; A length-fixing component (6), which is installed on the other side of the support frame (32), is used to determine the cutting length of the spring tube.

2. The spring tube fixed-length cutting device according to claim 1, characterized in that: The fixed-length component (6) includes a second support plate (61) installed on the outer wall of the other side of the support frame (32). A second mounting plate (62) is installed on the upper end of the second support plate (61). A second arc-shaped guide plate (63) is installed on the upper end of the second mounting plate (62). A one-way screw (64) is threaded on one side of the second arc-shaped guide plate (63). An adjusting sleeve (65) is slidably sleeved on the outer wall of the second arc-shaped guide plate (63). The spring tube is located inside the adjusting sleeve (65). A connecting sleeve (66) is installed on the outer wall of one side of the adjusting sleeve (65). One end of the one-way screw (64) is rotatably installed in the connecting sleeve (66). A third handle (611) is installed on the other end of the one-way screw (64). A limit part is provided on the second arc-shaped guide plate (63).

3. The spring tube fixed-length cutting device according to claim 2, characterized in that: An indicator plate (67) is installed at the lower end of the adjusting sleeve (65), and a scale line (68) is provided at the middle of the upper end of the second support plate (61). The indicator plate (67) corresponds to the scale line (68).

4. The spring tube fixed-length cutting device according to claim 2, characterized in that: The limiting part includes an arc-shaped pressure plate (69) rotatably mounted on one side of the middle part of the second arc-shaped guide plate (63). An adjusting bolt (610) is threaded on the arc-shaped pressure plate (69). When the arc-shaped pressure plate (69) is engaged, it is mounted on the second arc-shaped guide plate (63) through the adjusting bolt (610).

5. A spring tube fixed-length cutting device according to claim 1, characterized in that: The guide assembly (4) includes a first support plate (41) installed on one side of the support frame (32). A mounting frame (42) is installed on the upper end of the first support plate (41). A plurality of first guide wheels (43) are rotatably installed on the lower end of the mounting frame (42). A drive motor (48) is installed on one side of the mounting frame (42). The output end of the drive motor (48) passes through the mounting frame (42) and is connected to one of the first guide wheels (43). An adjusting block (44) is slidably installed inside the mounting frame (42). A second guide wheel (45) is rotatably installed on the lower end of the adjusting block (44). A circular channel for conveying the spring tube is formed between the first guide wheel (43) and the second guide wheel (45). An adjusting rod (46) is threadedly installed in the middle of the upper end of the mounting frame (42). The lower end of the adjusting rod (46) is rotatably installed inside the adjusting block (44). A first handle (47) is installed on the upper end of the adjusting rod (46).

6. The spring tube fixed-length cutting device according to claim 1, characterized in that: A first mounting plate (49) is installed in the middle of the upper end of the support frame (32), and a first arc-shaped guide plate (410) is installed at the upper end of the first mounting plate (49).

7. The spring tube fixed-length cutting device according to claim 1, characterized in that: The clamping assembly (5) includes a bidirectional lead screw (51) rotatably mounted on both sides of the upper end of the support frame (32). The outer walls of both ends of the two bidirectional lead screws (51) are threaded with clamping blocks (52). The lower ends of the clamping blocks (52) are slidably mounted on the support frame (32). Each clamping block (52) is provided with an airbag (53). A second handle (54) is installed at one end of each of the two bidirectional lead screws (51).

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