Slide fall prevention device

Abstract

Instead of using a bending load on the pin to prevent the slide from falling, this system uses a compressive load to prevent it from falling. [Solution] In a device for preventing a press machine slide from falling, the slide fall prevention member is inserted between a protrusion provided on a part of the piston to which the slide is fixed and a cylinder that causes the piston to reciprocate, thereby stopping the downward movement of the slide and preventing the slide from falling. By inserting the slide fall prevention member between the protrusion provided on a part of the piston and the cylinder, the protrusion and the upper end of the slide fall prevention member come into contact, thereby preventing the slide from falling.

Description

Technical Field

[0001] The technology of the present disclosure relates to a slide drop prevention device.

Background Art

[0002] Conventionally, a press machine is provided with a drop prevention device for preventing the slide from dropping when it stops. In the drop prevention device, a structure is adopted in which pins are inserted horizontally at a plurality of positions with respect to the slide at the upper limit position of the slide to prevent the slide from dropping. The technology related to Patent Document 1 is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional drop prevention device, since pins are inserted horizontally at a plurality of positions with respect to the slide, when preventing the slide from dropping, the drop is prevented by the bending load acting on the pins.

[0005] The technology of the present disclosure aims to provide a slide drop prevention device capable of preventing the slide from dropping by the action of a compressive load rather than by the action of a bending load on the pins for preventing the slide from dropping.

Means for Solving the Problems

[0006] To achieve the above object, a first aspect of the technology of the present disclosure is a device for preventing the slide of a press machine from dropping, wherein a slide drop prevention member is inserted between a protruding portion provided on a part of a piston to which the slide is fixed and a cylinder that reciprocates the piston, thereby stopping the descent of the piston and preventing the slide from dropping. [Effects of the Invention]

[0007] In a first aspect of the technology of this disclosure, the slide fall prevention member is inserted between a protrusion provided on a part of the piston and the cylinder, thereby bringing the upper end of the slide fall prevention member into contact with the protrusion and preventing the slide from falling. Therefore, the slide can be prevented from falling by a compressive load rather than by a bending load acting on the pin. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a front view of a press machine P equipped with the slide fall prevention device A according to the embodiment. [Figure 2] Figure 2 is a front view of the slide fall prevention device A. [Figure 3] Figure 3 shows the configuration of the slide fall prevention member 8A. [Figure 4A] Figure 4A shows the configuration of the moving device 8B, illustrating how the inner circumferences of the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A are located on the outer circumference of the piston 6b. [Figure 4B] Figure 4B shows the configuration of the moving device 8B, illustrating how the inner circumferences of the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A are separated from the outer circumference of the piston 6b. [Figure 5] Figure 5 shows how three slide fall prevention members 8A1 to 8A3 are stacked sequentially on top of the cylinder 6a in order to position the slide 5 at a first height and prevent it from falling. [Figure 6] Figure 6 shows how two slide fall prevention members 8A2 and 8A3 are stacked sequentially on top of the cylinder 6a in order to position the slide 5 at a second height and prevent it from falling. [Figure 7] Figure 7 shows how a slide fall prevention member 8A3 is placed on top of the cylinder 6a to position the slide 5 at a third height and prevent it from falling. [Figure 8] Figure 8 shows how the slide fall prevention members 8A1 to 8A3 are moved from the first position to the second position in order to position slide 5 in the fourth position (lowest position). [Figure 9] Figure 9 is a perspective view showing the configuration of the slide fall prevention member 30A of the first modified example. [Figure 10] Figure 10 is a cross-sectional view showing the configuration of the slide fall prevention member 32A of the second modified example. [Figure 11] Figure 11 is a perspective view showing the configuration of an insertion member 9H inserted between the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A (Figure 3) in a third modified example. [Figure 12] Figure 12 is a perspective view showing the configuration of an insertion member 9I inserted between the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A (Figure 3) in the fourth modified example. [Modes for carrying out the invention]

[0009] [Embodiment] Embodiments of the technology of this disclosure will be described below with reference to the drawings.

[0010] (composition) The configuration of the press machine P equipped with the slide drop stopper device A of this embodiment will now be described. Figure 1 is a front view of the press machine P of this embodiment. As shown in Figure 1, the press machine P has a crown 1, a bed 2, and uprights 3, 3 connecting them. A pressurizing cylinder 4 is provided on the crown 1. A slide 5 is fixed to the piston of the pressurizing cylinder 4. When the pressurizing cylinder 4 extends, the slide 5 descends. This allows the workpiece to be processed by the die attached to the slide 5 and the bed 2.

[0011] The press machine P is equipped with a slide fall prevention device A that prevents the slide 5 from falling.

[0012] The press machine P is equipped with a pair of return cylinders 6, 6.

[0013] The return cylinder 6 includes a piston 6b connected to the slide 5 and a cylinder 6a that reciprocates the piston 6b. By the upward movement of the piston 6b, the slide 5 can be raised. A flange 6af is provided on the upper end side of the cylinder 6a. The cylinder 6a is fixed to the side surface of the bed 2. A flange 7 is provided on a part of the piston 6b.

[0014] The flange 7 is an example of the "protrusion" of the technology of the present disclosure. Instead of the flange 7, a plurality (for example, 2, 3, or 4) of protrusions may be provided on the piston 6b in a circumferential shape.

[0015] The object to which the slide drop prevention device A is attached is not limited to the press machine P such as the above hydraulic press, and is not particularly limited as long as it is a press machine provided with a return cylinder that reciprocates the slide. For example, the slide drop prevention device A may be provided in a press machine that presses a press target by moving a slide with an electric motor, a servo motor, a flywheel, or the like.

[0016] Also, the number of return cylinders is not limited to two, and may be four, or three or more. Also, the slide drop prevention device A may be attached to all the return cylinders, or may be attached to some of the return cylinders. For example, when the number of return cylinders is three, the slide drop prevention device A may be provided with two or three, and when the number of return cylinders is four, the slide drop prevention device A may be provided with two, three, or four.

[0017] Figure 2 is a front view of the slide drop prevention device A. As shown in Figure 2, the slide drop prevention device A inserts (that is, sandwiches) a slide drop prevention member 8 between a flange 7 provided on a part of the piston 6b connected to the slide 5 and a cylinder 6a that reciprocates the piston 6b, thereby stopping the downward movement of the piston 6b and preventing the slide 5 from dropping. The slide drop prevention member is also called a safety block or a safety lock.

[0018] The slide fall prevention device A is equipped with a plurality (for example, three) of slide fall prevention members 8A1 to 8A3, and by stacking the plurality of slide fall prevention members 8A1 to 8A3 sequentially on the flange 6af of the cylinder 6a, the descent of the slide 5 is stopped at different height positions. When the slide fall prevention member 8 is inserted between the flange 7 and the flange 6af of the cylinder 6a and the piston 6b descends, the upper end surface 10A (see also Figure 3) of the slide fall prevention member 8 comes into contact with the flange 7.

[0019] The slide fall prevention device A includes moving devices 8B1 to 8B3 that move the slide fall prevention member 8 to a first position (see Figure 2) in which the slide 5 does not fall when inserted between the flange 7 of the piston 6b and the flange 6af of the cylinder 6a, and to a second position located away from the first position. The moving devices 8B1 to 8B3 are examples of the "moving parts" of the technology of this disclosure.

[0020] Figure 3 shows the configuration of the slide fall prevention member 8A. Since slide fall prevention members 8A1 to 8A3 have the same configuration, they will be described as slide fall prevention member 8A. As shown in Figure 3, the slide fall prevention member 8A comprises an upper end surface 10A, a lower end surface 11B facing the upper end surface 10A, and a plurality of cylindrical (pipe) members 9 inserted between the upper end surface 10A and the lower end surface 11B. The upper end surface 10A and the lower end surface 11B have a semicircular band shape. This is because the slide fall prevention member 8A rotates toward the piston 6b by the moving device 8B, and the upper end surface 10A and the lower end surface 11B are positioned between the flange 6af of the cylinder 6a and the flange 7 of the piston 6b, so that the inner circumferences of the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A are positioned on the outer circumference of the piston 6b. Note that the cylindrical members 9 of the slide fall prevention members 8A1 to 8A3 have different heights. The cylindrical member 9 is an example of a "cylindrical member" in the technology of this disclosure.

[0021] Figures 4A and 4B show the configuration of the moving device 8B. Figure 4A shows that the inner circumferences of the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A are located on the outer circumference of the piston 6b. Figure 4B shows that the inner circumferences of the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A are separated from the outer circumference of the piston 6b. Since the moving devices 8B1 to 8B3 have the same configuration, they will be described as moving device 8B. As shown in Figures 4A and 4B, moving device 8B includes a position member 25 fixed to the cylindrical member 9 of the slide fall prevention member 8, and a rotation mechanism R to which the position member 25 is connected and which rotates the position member 25. The rotation mechanism R rotates the position member 25 around an axis 22 such that the inner circumferences of the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A rotate toward the piston 6b, so that the upper end surface 10A and the lower end surface 11B are positioned between the flange 6af of the cylinder 6a and the flange 7 of the piston 6b.

[0022] The rotation mechanism R comprises a support column 20, a square pipe-shaped connecting member 24 with one end fixed to a position member 25 and the other end rotatably connected to a shaft 22, a bearing member 23 for the shaft 22, and an intermediate member 21 that supports the bearing member 23 with one side surface and has a surface connected to that side surface fixed to one side surface of the support column 20.

[0023] The rotation mechanism R includes a connecting member 28 fixed to the surface of the support column 20 that connects to the surface on that side, and a cylinder device 267 supported by the connecting member 28, which includes a cylinder 26 and a piston 27. When the piston 27 of the cylinder device 267 moves in the contraction direction into the cylinder 26, the square pipe-shaped connecting member 24 is pulled towards the cylinder device 267. As a result, as shown in Figure 4A, the inner circumferences of the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A rotate toward the piston 6b, so that the upper end surface 10A and the lower end surface 11B are positioned between the flange 6af of the cylinder 6a and the flange 7 of the piston 6b. Also, the inner circumferences of the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A are positioned on the outer circumference of the piston 6b. The position of the slide fall prevention member 8A in this case is the first position. When the piston 27 of the cylinder device 267 extends outward from the cylinder 26, the square pipe-shaped connecting member 24 moves away from the cylinder device 267, as shown in Figure 4B. The position of the slide fall prevention member 8A in this case is the second position.

[0024] (action) This section explains how the slide fall prevention device prevents slide 5 from falling. Specifically, it explains how the device prevents slide 5 from falling by positioning it at a height between the first and fourth levels. There are reasons for positioning slide 5 at these heights. For example, slide 5 is positioned at the first level to remove the pressed product. Slide 5 is positioned at the second level to replace the mold. Slide 5 is positioned at the third level to perform maintenance on slide 5 and other components.

[0025] Figure 5 shows how three slide fall prevention members 8A1 to 8A3 are stacked sequentially on top of the cylinder 6a in order to position the slide 5 at a first height and prevent it from falling.

[0026] In each of the moving devices 8B1 to 8B3 (see also Figure 4A), the rotation mechanism R of each moving device 8B1 to 8B3 rotates the positioning member 25 around the axis 22 so that the slide fall prevention members 8A1 to 8A3 are moved to a first position, specifically, so that the inner circumferences of the upper end surface 10A and the lower end surface 11B of the slide fall prevention device A rotate toward the piston 6b, so that the upper end surface 10A and the lower end surface 11B are positioned between the flange 6af of the cylinder 6a and the flange 7 of the piston 6b, and the inner circumferences of the upper end surface 10A and the lower end surface 11B are positioned on the outer circumference of the piston 6b.

[0027] In this case, the flange 7 of the piston 6b contacts the upper end surface 10A of the slide fall prevention member 8A1. The slide 5 is stopped at the first height position. The lower end surface 11B1 of the slide fall prevention member 8A1 and the upper end surface 10A2 of the slide fall prevention member 8A2 come into contact. The lower end surface 11B2 of the slide fall prevention member 8A2 and the upper end surface 10A3 of the slide fall prevention member 8A3 come into contact. The lower end surface 11B3 of the slide fall prevention member 8A3 and the flange 6af of the cylinder 6a come into contact.

[0028] Figure 6 shows how two slide fall prevention members 8A2 and 8A3 are stacked sequentially on top of the cylinder 6a in order to position the slide 5 at a second height and prevent it from falling.

[0029] Each of the moving devices 8B2 and 8B3 (see also Figure 4) moves the slide fall prevention members 8A2 and 8A3 to a first position, specifically, the inner circumferences of the upper end surface 10A and lower end surface 11B of the slide fall prevention device A rotate toward the piston 6b, so that the upper end surface 10A and the lower end surface 11B are positioned between the flange 6af of the cylinder 6a and the flange 7 of the piston 6b, by which the respective rotation mechanisms R of the moving devices 8B2 and 8B3 rotate the position member 25 around the axis 22. Meanwhile, the moving device 8B1 moves the slide fall prevention member 8A1 to a second position away from the first position.

[0030] In this case, the flange 7 of the piston 6b contacts the upper end surface 10A2 of the slide fall prevention member 8A2. The slide 5 is stopped at a second height position, which is lower than the first height position.

[0031] The lower end surface 11B2 of the slide fall prevention member 8A2 and the upper end surface 10A3 of the slide fall prevention member 8A3 come into contact. The lower end surface 11B3 of the slide fall prevention member 8A3 comes into contact with the flange 6af of the cylinder 6a.

[0032] Figure 7 shows how a slide fall prevention member 8A3 is placed on top of the cylinder 6a to position the slide 5 at a third height and prevent it from falling.

[0033] The moving device 8B3 (see also Figure 4) moves the slide fall prevention member 8A3 to a first position, specifically, the inner circumferences of the upper end surface 10A and lower end surface 11B of the slide fall prevention device A4 rotate toward the piston 6b, so that the upper end surface 10A and lower end surface 11B are positioned between the flange 6af of the cylinder 6a and the flange 7 of the piston 6b, as the rotating mechanism R of the moving device 8B3 rotates the position member 25 about the axis 22. The moving devices 8B1 and 8B2 move the slide fall prevention member 8A1 and the slide fall prevention member 8A2 to a second position away from the first position, respectively.

[0034] In this case, the flange 7 of the piston 6b contacts the upper end surface 10A of the slide fall prevention member 8A3. The slide 5 is stopped at a third height position, which is lower than the second height position.

[0035] The lower end surface 11B3 of the slide fall prevention member 8A3 and the flange 6af of the cylinder 6a come into contact.

[0036] Figure 8 shows how the slide fall prevention members 8A1 to 8A3 are moved from the first position to the second position in order to position slide 5 in the fourth position (lowest position).

[0037] When the sliding devices 8B1-8B3 position the slide fall prevention members 8A1-8A3 to the second position, the flange 7 of the piston 6b contacts the flange 6af of the cylinder 6a. The slide 5 is stopped at its lowest position.

[0038] (effect) In conventional technology, when a pin is inserted into the slide to prevent it from falling, the pin acts as the weight of the slide. However, in this embodiment, a slide fall prevention member 8 is inserted between a flange 7 provided on a part of the piston 6b and the cylinder 6a, causing the flange 7 and the upper end of the slide fall prevention member 8 to come into contact and prevent the slide 5 from falling. Instead of preventing the slide from falling by a bending load acting on the pin, the slide can be prevented from falling by a compressive load.

[0039] Furthermore, the conventional technology described above uses pins with a pin diameter that can withstand bending loads, and provides bearings to support the pins. Therefore, as the slide weight increases, the pin diameter must be increased to ensure strength, and the bearing section supporting the pins also becomes larger, resulting in a larger device and requiring a larger installation space. However, by inserting a slide fall prevention member 8 between the flange 7 provided on a part of the piston 6b and the cylinder 6a, it is possible to prevent the device from becoming larger due to the increased pin diameter and the enlargement of the bearing section supporting the pins.

[0040] Furthermore, in this embodiment, since the slide fall prevention member 8 is inserted between the flange 7 of the piston 6b and the cylinder 6a, the installation space required for conventional fall prevention devices is eliminated, resulting in space savings. Therefore, in this embodiment, the area between the flange 7 of the piston 6b and the cylinder 6a can be effectively utilized for slide fall prevention.

[0041] In conventional technology, when inserting pins into the slide at various heights, it was necessary to provide multiple bearings and drive cylinders to support the pins. Furthermore, installing multiple fall prevention devices at multiple heights required a large installation space, and the number of cylinders, solenoid valves, control equipment, and wiring needed for each device increased the number of parts and thus the cost. However, in this embodiment, by sequentially stacking multiple slide fall prevention members 8 on top of the cylinder 6a, the descent of the slide 5 can be stopped at different heights. In other words, the slide fall prevention device A can be made multi-stage. Therefore, the descent of the slide 5 can be stopped at a desired selected height. Consequently, the number of parts can be reduced, and costs can be lowered. Also, since multiple slide fall prevention members 8 are sequentially stacked on top of the cylinder 6a at multiple positions, such as the upper limit position of the slide and the mold replacement position of the slide, the slide can be prevented from falling even at positions other than the upper limit position.

[0042] In this embodiment, the flange of the piston 6b and the upper end surface 10A of the slide fall prevention member 8 are in contact, making it easier to secure a larger contact area than in the case of a pin, and thus enabling the fall prevention of heavier slides 5.

[0043] In this embodiment, multiple cylindrical members 9 are inserted between the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8. Therefore, when the flange 7 of the piston 6b comes into contact with the upper end surface 10A of the slide fall prevention member 8, the load is distributed among the multiple cylindrical members 9, preventing the heavier slide 5 from falling. Because multiple cylindrical members 9 inserted between the upper end surface 10A and the lower end surface 11B are used, the structure is simple and costs can be reduced.

[0044] In this embodiment, the moving devices 8B1 to 8B3 move the slide fall prevention member 8 to a first position where the slide 5 will not fall when inserted between the piston 6b and the cylinder 6a, and to a second position located away from the first position. Therefore, in this embodiment, the slide fall prevention member 8 can be easily moved to the first position and the second position depending on whether it is desired to prevent the slide 5 from falling or to lower the slide 5 to the flange 6ab of the cylinder 6a.

[0045] In this embodiment, if the slide fall prevention member 8 is moved linearly between the first and second positions, sufficient space is required for the slide prevention member 5 to move back and forth, resulting in a larger overall device. However, in the invention of claim 6, since the rotation mechanism R rotates the position member 25 around the axis 22, the space required for operation is relatively small, and since only the slide fall prevention member 8 is rotated, the overall device can be made more compact.

[0046] [Differentiation] Various modifications of this embodiment will be described below. Since each modification is substantially the same as the configuration and operation of the above embodiment, the same reference numerals are used for the same parts, and their descriptions are omitted.

[0047] The slide fall prevention member 8A of the above embodiment (see Figure 3) comprises an upper end surface 10A, a lower end surface 11B, and a plurality of cylindrical members 9 inserted between the upper end surface 10A and the lower end surface 11B.

[0048] In addition to at least one of the slide fall prevention members 8A1 to 8A3 (see Figure 3) of the above embodiment, a slide fall prevention member of the first modified example or a slide fall prevention member of the second modified example may be used.

[0049] (First variation) Figure 9 is a perspective view showing the configuration of the slide fall prevention member 30A of the first modified example. The slide fall prevention member 30A of the first modified example has a semi-cylindrical shape. Since the first modified example includes one semi-cylindrical slide fall prevention member 30A, the configuration of the slide fall prevention member can be made simpler. The slide fall prevention member 30A of the first modified example is positioned in a first position or a second position by the moving device 8B.

[0050] (Second variation) Figure 10 is a cross-sectional view showing the configuration of the slide fall prevention member 32A of the second modified example. The slide fall prevention member 32A of the second modified example has a U-shaped cross-section (channel structure). The second modified example allows for a simpler configuration of the slide fall prevention member. The slide fall prevention member 32A of the second modified example rotates the pinion in a first or second direction by driving a motor in a moving device, such as a rack and pinion, to position the rack on which the slide fall prevention member 32A is mounted at a first or second position on the piston 6b.

[0051] In place of the cylindrical member 9 in at least one of the slide fall prevention members 8A1 to 8A3 (see Figure 3) of the above embodiment, a member of the third modified example, the fourth modified example, or any other modified example may be used.

[0052] (Third variation) Figure 11 is a perspective view showing the configuration of an insertion member 9H inserted between the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A (see Figure 3) in the third modified example. The shape of the insertion member 9H is angle-shaped (the cross-section is L-shaped (mountain-shaped)).

[0053] (Fourth variation) Figure 12 is a perspective view showing the configuration of an insertion member 9I inserted between the upper end surface 10A and the lower end surface 11B of the slide fall prevention member 8A (see Figure 3) in the fourth modified example. The shape of the insertion member 9I is a V-shaped groove, which is a part of a cylinder that is cut out in a V-shape along the axial direction.

[0054] (Other variations) The shape does not have to be cylindrical (pipe) like a cylindrical member; it can also be a cylindrical shape (round bar), a rectangular prism, a rectangular pipe, or even an H shape.

[0055] (Further variations) In the above embodiment, the descent of the slide 5 is stopped at different heights by sequentially stacking multiple slide fall prevention members 8 on the cylinder 6a. The technology of this disclosure is not limited thereto. For example, the structure may be such that the position of each of the multiple slide fall prevention members 8 can be adjusted by providing a position adjustment device.

[0056] Based on the above disclosures, the following addendum is proposed. (Note 1) In a device for preventing the slide of a press machine from falling, By inserting a slide fall prevention member between a protrusion provided on a part of the piston connected to the slide and a cylinder that causes the piston to reciprocate, the downward movement of the piston is stopped, and the slide is prevented from falling. Slide fall prevention device.

[0057] (Note 2) The slide fall prevention members are provided, each with a different height. By stacking multiple slide fall prevention members on the cylinder in order of increasing height, the downward movement of the slide is stopped at different height positions. The slide fall prevention device described in Appendix 1.

[0058] (Note 3) The aforementioned protrusion is a flange, The slide fall prevention member is inserted between the flange and the upper surface of the cylinder, and when the piston descends, the upper end surface of the slide fall prevention member comes into contact with the flange. A slide fall prevention device as described in Appendix 1 or Appendix 2.

[0059] (Note 4) The aforementioned slide fall prevention member is The upper end surface and, The lower end surface facing the upper end surface, A plurality of cylindrical members inserted between the upper end surface and the lower end surface, Equipped with, The slide fall prevention device described in Appendix 3.

[0060] (Note 5) The slide fall prevention member is provided with a movable part that moves it between a first position in which the slide does not fall when inserted between the protruding part and the cylinder, and a second position located away from the first position. A slide fall prevention device as described in any one of the appendices 1 to 4.

[0061] (Note 6) The aforementioned movable part is A member having an inner circumference corresponding to the outer circumference of the piston, wherein the inner circumference can be positioned on the outer circumference of the piston, The aforementioned members are connected, and a pivot mechanism is provided to rotate the members around an axis such that the inner circumference is positioned relative to the outer circumference. Equipped with, The slide fall prevention device described in Appendix 5. [Explanation of symbols]

[0062] P Press Machine 5 slides A slide fall prevention device 7 Flange 6b Piston 6a Cylinder 8. Slide fall prevention member 9. Cylindrical member 10A top surface 11B Bottom end surface 25 Positioning member 22 axes R Rotation Mechanism

Claims

1. In a device for preventing the slide of a press machine from falling, By inserting a slide fall prevention member between a protrusion provided on a part of the piston connected to the slide and a cylinder that causes the piston to reciprocate, the downward movement of the piston is stopped, and the slide is prevented from falling. Slide fall prevention device.

2. The slide fall prevention members are provided, each with a different height. By stacking multiple slide fall prevention members on the cylinder in order of increasing height, the downward movement of the slide is stopped at different height positions. The slide fall prevention device according to claim 1.

3. The aforementioned protrusion is a flange, The slide fall prevention member is inserted between the flange and the upper surface of the cylinder, and when the piston descends, the upper end surface of the slide fall prevention member comes into contact with the flange. The slide fall prevention device according to claim 1.

4. The aforementioned slide fall prevention member is The upper end surface and, The lower end surface facing the upper end surface, A plurality of cylindrical members inserted between the upper end surface and the lower end surface, Equipped with, The slide fall prevention device according to claim 3.

5. The slide fall prevention member is provided with a movable part that moves it between a first position in which the slide does not fall when inserted between the protruding part and the cylinder, and a second position located away from the first position. The slide fall prevention device according to claim 1.

6. The aforementioned movable part is A positioning member having an inner circumference corresponding to the outer circumference of the piston, wherein the inner circumference can be positioned at the outer circumference of the piston, The position member is connected to a pivot mechanism that rotates the position member around an axis such that the inner circumference is positioned on the outer circumference, Equipped with, The slide fall prevention device according to claim 5.

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