Emergency stop mechanism and mobile stretch film dispensing device equipped with emergency stop mechanism

Abstract

This invention provides an emergency stop mechanism that can prevent a unit from falling. [Solution] An emergency stop mechanism 40 for emergency stopping a unit 30 that is suspended by a fishing line T and can be raised and lowered, comprising: an emergency stop mechanism body 41 provided on the unit 30; a second support column 22 provided along the raising and lowering range of the unit 30; and a locking part 42 biased by a locking spring 48 toward the second support column 22 from the emergency stop mechanism body 41, wherein the locking part 42 has a first rack 43 and a tension sensing pulley 47 on which the fishing line T is hung, and the second support column 22 has a second rack 22 that the first rack 43 engages with, and the fishing line T is stretched in a first direction from the emergency stop mechanism body 41 and stretched in a second direction by being hung on the tension sensing pulley 47, and in the event of an abnormality where the tension of the fishing line T falls below a predetermined tension, the locking part 42 is biased by the locking spring 48 and the first rack 43 engages with the second rack 44.

Description

Technical Field

[0006] , ,

[0001] The present disclosure relates to an emergency stop mechanism and a mobile stretch film dispensing device provided with the emergency stop mechanism.

Background Art

[0002] Devices for raising and lowering a unit suspended by a string-like wire such as tags are known. For example, Patent Document 1 discloses an outer wall inspection device that is suspended by a string-like wire and raises and lowers a gondola along the outer wall of a building.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described outer wall inspection device, in the event of an abnormality such as when the string-like wire is cut by an external force, the unit may fall, leading to a serious accident. Therefore, from the perspective of safety, a mechanism for immediately stopping the fall of the unit in the event of an abnormality is necessary. <​​​​​​​​The emergency stop mechanism according to this disclosure is an emergency stop mechanism for emergency stopping a liftable unit suspended by a string-like wire, comprising: an emergency stop mechanism body provided on the unit; a locking portion provided along the lifting range of the unit; and a locking portion biased by a first spring toward the locking portion from the emergency stop mechanism body, wherein the locking portion comprises a first rack and a first pulley on which the string-like wire is placed, and the locking portion comprises a second rack with which the first rack engages, the string-like wire is stretched in a first direction from the emergency stop mechanism body, placed on the first pulley, and stretched in a second direction, wherein under normal conditions the locking portion separates from the locking portion against the biasing force of the first spring due to the tension of the string-like wire, and under abnormal conditions when the tension of the string-like wire falls below a predetermined tension, the locking portion is biased by the first spring and the first rack engages with the second rack, thereby locking to the locking portion. [Effects of the Invention]

[0007] According to the emergency stop mechanism of this disclosure, the unit's fall can be stopped in an emergency. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic front view showing the winding process of the stretch film according to the embodiment. [Figure 2] This is a schematic plan view showing the winding process of the stretch film according to the embodiment. [Figure 3] This is a perspective view showing a mobile stretch film dispensing device, which is an example of an embodiment. [Figure 4] This is a side view from the left side in the left-right direction, showing a mobile stretch film dispensing device, which is an example of an embodiment. [Figure 5] This is a rear view, seen from the rear, showing a mobile stretch film dispensing device, which is an example of an embodiment. [Figure 6] This is a perspective view showing the emergency stop mechanism. [Figure 7] This is a side view from the right side, showing the emergency stop mechanism. [Figure 8]This is a perspective view showing the film retainer. [Figure 9] This is a perspective view showing a one-way clutch mechanism. [Figure 10] This is a perspective view showing the winding mechanism. [Figure 11] This is a perspective view showing the legs. [Modes for carrying out the invention]

[0009] An example of an embodiment of this disclosure is described in detail below. In the following description, specific shapes, materials, directions, numerical values, etc., are examples provided to facilitate understanding of this disclosure and can be modified as appropriate to suit the application, purpose, specifications, etc.

[0010] [Mobile stretch film dispensing device] A mobile stretch film dispensing device (hereinafter referred to as the film dispensing device 10), which is an example of an embodiment, will be described using Figures 1 to 5.

[0011] As shown in Figures 1 and 2, the film dispensing device 10 is a device that can move while dispensing the stretch film F. With the film dispensing device 10, an operator can dispensing the stretch film F from the device and, while changing the dispensing height of the stretch film F, move the device together with the film dispensing device 10, for example, around cardboard boxes B stacked on a pallet P, and wrap the stretch film F around the cardboard boxes B stacked on the pallet P. This prevents the stacked cardboard boxes B from collapsing when the pallet P is transported by a forklift or the like.

[0012] And according to the film drawing device 10, it is not necessary for an operator to wrap the stretch film F around the cardboard boxes B stacked on the pallet P while holding the stretch film F in a semi - crouched position. Thereby, the working load of the operator can be reduced. Note that the operation of winding the stretch film F by the film drawing device 10 of the present disclosure is not limited to this embodiment. The stretch film F may be wound around other packages by the film drawing device 10.

[0013] The stretch film F of the present embodiment is, for example, a transparent film made of polyethylene. The stretch film F is stretchable and has the property of adhering to packages by self - adhesiveness, static electricity, and frictional force. Before being drawn out, the stretch film F is configured as a stretch film roll (hereinafter, film roll R) wound around a paper tube multiple times. Note that there are also film rolls R that do not have a paper tube.

[0014] As shown in FIGS. 3 to 5, the film drawing device 10 includes a main body 20, a unit 30, a winding mechanism 70, and legs 80, the details of which will be described later. The unit 30 has an emergency stop mechanism 40, a film retainer 50, and a one - way clutch mechanism 60, the details of which will be described later.

[0015] Hereinafter, the vertical direction will be described as the up - down direction (Z direction in the figure), the direction in which the first support column 21 and the second support column 22 of the main body 20 are arranged will be described as the left - right direction (X direction in the figure), and the direction orthogonal to the up - down direction and the left - right direction will be described as the front - rear direction (Y direction in the figure). Also, the side on which the winding mechanism 70 is provided in the front - rear direction will be defined as the front side. Further, the right side or the left side in the left - right direction as viewed from the front side will be defined.

[0016] [Main body] The main body 20 will be described with reference to FIGS. 4 and 5.

[0017] The main body 20 is the base of the film drawing device 10. The main body 20 extends along the vertical direction. The main body 20 has a first support column 21, a second support column 22, and a pulley support portion 23.

[0018] The first support column 21 is a long member extending along the vertical direction. The first support column 21 is composed of a hollow aluminum pipe. The unit main body 31 of the unit 30 described later is slidably supported on the first support column 21. Further, legs 80 are provided at the bottoms of the first support column 21 and the second support column 22.

[0019] The second support column 22 is a long member adjacent to the first support column 21 and extending along the vertical direction. The second support column 22 is composed of a hollow aluminum pipe. A second rack 44 of the emergency stop mechanism 40 described later is provided on the rear surface of the second support column 22. Also, a winding mechanism 70 is provided at a middle portion of the front surface of the second support column 22. Further, legs 80 are provided at the bottoms of the first support column 21 and the second support column 22. Note that the second support column 22 is also a component of the emergency stop mechanism 40 described later and functions as a locked portion of the emergency stop mechanism 40.

[0020] The pulley support portion 23 is provided at the upper end portion of the first support column 21. The pulley support portion 23 extends upward and forward from the upper end portion of the first support column 21. The pulley support portion 23 is composed of a combination of a plurality of hollow aluminum pipes. The pulley support portion 23 has a first upper pulley 24 as a second pulley provided on the tip side of the pulley support portion 23 and a second upper pulley 25 provided on the base end side of the pulley support portion 23. Tags T are hung on the first upper pulley 24 and the second upper pulley 25.

[0021] [Unit] The unit 30 will be described with reference to FIGS. 4 and 5.

[0022] Unit 30 is suspended from the main body 20 by a fishing line T to the left side of the main body 20. Unit 30 can be raised along the main body 20 by winding up the fishing line T with a winding mechanism 70. Unit 30 has a unit body 31 that is slidably mounted on the main body 20, and an emergency stop mechanism 40, a film retainer 50, and a one-way clutch mechanism 60, the details of which will be described later. The emergency stop mechanism 40 and the one-way clutch mechanism 60 are fixed to the unit body 31.

[0023] [Emergency stop mechanism] The emergency stop mechanism 40 will be explained using Figures 6 and 7.

[0024] The emergency stop mechanism 40 will stop the unit 30 from falling if the tension of the fishing line T suspending the unit 30 falls below a predetermined tension (hereinafter referred to as an abnormal condition). An abnormal condition includes cases where the fishing line T is cut, or where the fishing line T comes off the first upper pulley 24, the second upper pulley 25, or the tension detection pulley 47. The predetermined tension may be slightly less than the tension of the fishing line T when the unit 30 is normally suspended from the fishing line T.

[0025] The emergency stop mechanism 40 comprises an emergency stop mechanism body 41, a locking part 42, and a second support column 22 of the body 20 which serves as the locked part, each of which will be described in detail later.

[0026] The emergency stop mechanism body 41 is the base part of the emergency stop mechanism 40. The emergency stop mechanism body 41 is fixed to the unit body 31 via the clutch body 61 (see Figure 5). The emergency stop mechanism body 41 is constructed by combining a pair of hollow aluminum pipes. The emergency stop mechanism body 41 has a roller 45 that rolls on the rear surface of the first support column 21 of the body 20 and a ring 46 to which the end of the fishing line T is fixed.

[0027] The locking part 42 locks onto the second support column 22, which acts as the locked part, in the event of an abnormality, thereby bringing the unit 30 to an emergency stop. The locking part 42 is constructed by combining a pair of hollow aluminum pipes. The locking part 42 is biased from the emergency stop mechanism body 41 toward the second support column 22, which acts as the locked part, by a locking spring 48, which acts as the first spring. The locking part 42 also has a first rack 43 that engages with a second rack 44, which will be described later, and a tension-sensing pulley 47, which acts as the first pulley, onto which the fishing line T is attached.

[0028] The second support column 22, which serves as the locking portion, is a component of the emergency stop mechanism 40 and also a component of the main body 20. A second rack 44 is provided on the second support column 22 along the vertical direction. The second rack 44 engages with the first rack 43.

[0029] The fishing line T is stretched from unit 30 in a first direction, placed over tension sensing pulley 47, and stretched in a second direction. More specifically, the fishing line T is stretched from ring 46 of emergency stop mechanism body 41 in the front-rear direction, placed over tension sensing pulley 47, stretched vertically, and placed over second upper end pulley 25 of body 20. In other words, the tension of the fishing line T causes the locking part 42 to move to the rear side and compress the locking spring 48. At this time, the first rack 43 separates from the second rack 44.

[0030] With the above configuration, under normal conditions, the locking portion 42 compresses the locking spring 48 due to the tension of the fishing line T and moves to the rear, separating the locking portion 42 from the second support column 22, which is the locked portion. As a result, the unit 30 is able to slide freely in the vertical direction. On the other hand, in the event of an abnormality, the tension of the fishing line T is released, so the locking portion 42 is biased forward by the locking spring 48, and the first rack 43 engages with the second rack 44. As a result, the locking portion 42 is locked to the second support column 22, which is the locked portion, and the unit 30 is locked to the main body 20. As a result, the unit 30 can be stopped from falling in an emergency.

[0031] The emergency stop mechanism 40 ensures that the unit 30 can be reliably stopped from falling in the event of an abnormality. This ensures the safety of the film dispensing device 10. The emergency stop mechanism described herein is not limited to this embodiment. The emergency stop mechanism can be applied to any unit that is suspended and can be raised and lowered by a string-like wire such as fishing line.

[0032] [Film retainer] The film retainer 50 will be explained using Figure 8.

[0033] The film retainer 50 supports the film roll R so that it can rotate freely around its axis. Furthermore, the film retainer 50 supports the film roll R in a detachable manner. In addition, the film retainer 50 supports the film roll R so that it can rotate freely around its radial axis (hereinafter referred to as the twisting rotation of the stretch film F). Note that the twisting rotation of the stretch film F in the film retainer 50 is limited to one direction only by a one-way clutch mechanism 60, which will be described in detail later. The film retainer 50 allows for easy attachment and detachment of the film roll R while ensuring its holding force.

[0034] The film retainer 50 is supported by a one-way clutch mechanism 60 and has a fixed support 51 that supports one axial end of the film roll R and a movable support 52 that supports the other axial end of the film roll R and is biased toward the fixed support 51. The film retainer 50 supports the film roll R by sandwiching it between the fixed support 51 and the movable support 52.

[0035] The fixed support 51 has a fixed support portion 53, a pressing portion 54, and a gripping portion 55. The fixed support portion 53 is rotatably mounted on one end of the fixed support 51 and is fitted onto the paper tube at one end of the film roll R. The fixed support portion 53 allows one end of the film roll R to be rotatably supported.

[0036] The retaining portion 54 holds down the side surface of the film roll R, which is supported by the film retainer 50, to prevent it from falling. The retaining portion 54 is provided on the side surface of the film roll R. The retaining portion 54 is constructed in a roughly L-shape by combining hollow aluminum pipes. Furthermore, the retaining portion 54 is provided so as to be rotatable around the radial axis of the film roll R. This allows the retaining portion 54 to release the grip on the side surface of the film roll R and to attach or detach the film roll R.

[0037] A pair of gripping sections 55 are provided on one side of the film roll R in the axial direction. Each of the gripping sections 55 extends along the front-to-back direction. The gripping sections 55 are made of hollow aluminum pipes. The operator can grip the gripping sections 55 and twist and rotate the stretch film F.

[0038] The movable support 52 includes a movable support portion 56, a guide portion 57, a retaining spring 58 as a third spring, and a gripping portion 59. The movable support portion 56 is rotatably mounted on the other end of the movable support 52 and is fitted onto the paper tube at the other end of the film roll R. The movable support portion 56 is tapered so as to decrease in diameter towards the film roll R. The movable support portion 56 allows the other end of the film roll R to be rotatably supported. Furthermore, the tapered shape of the movable support portion 56 makes it easy to attach to and detach from the paper tube at the other end of the film roll R.

[0039] The guide section 57 guides the stretch film F pulled out from the film roll R. The guide section 57 is provided along the axial direction of the film roll R. A pair of guide sections 57 are provided at a predetermined distance from the film roll R.

[0040] The retaining spring 58, acting as a third spring, biases the movable support 52 toward the fixed support 51. With the retaining spring 58, the film roll R can be sandwiched between the fixed support 51 and the movable support 52, thereby supporting the film roll R.

[0041] A pair of gripping sections 59 are provided on the other side of the film roll R in the axial direction. Each of the pair of gripping sections 59 extends along the front-to-back direction. The gripping sections 59 are made of hollow aluminum pipes. The operator can grip the gripping sections 59 and twist and rotate the stretch film F.

[0042] [One-way clutch mechanism] The one-way clutch mechanism 60 will be explained using Figure 9.

[0043] The one-way clutch mechanism 60 can rotate the stretch film F in only one direction during its twisting rotation. Furthermore, the one-way clutch mechanism 60 can hold the film retainer 50 at any angle during the twisting rotation of the stretch film F. The one-way clutch mechanism 60 comprises a clutch body 61, a gear 62, a pawl 63, a pawl support 64, and a pawl biasing 65.

[0044] The clutch body 61 is the base part of the one-way clutch mechanism 60. The clutch body 61 is configured in an inverted T shape when viewed from the rear in the front-rear direction (see Figure 5). The clutch body 61 is constructed by combining hollow aluminum pipes. The clutch body 61 is fixed to the unit body 31. The gear 62, pawl 63, and pawl support part 64 are fixed to the clutch body 61.

[0045] The gear 62 is rotatably supported on the clutch body 61 with its axis in the left-right direction. A film retainer 50 is also supported on the gear 62.

[0046] The pawl 63 is provided to mesh with the gear 62. More specifically, the pawl 63 is provided to mesh at approximately the 11 o'clock position when viewed from the left-right direction (the axial direction of the gear 62). The pawl 63 is also supported so as to be able to swing with respect to the radial direction of the gear 62. Furthermore, an inclined portion 63S is formed on the tip side of the pawl 63 (the side that meshes with the gear 62) toward the clockwise direction of the gear 62 when viewed from the left-right direction (the axial direction of the gear 62).

[0047] With the above configuration, when the gear 62 rotates counterclockwise when viewed from the left-right direction (the axial direction of the gear 62), the inclined portion 63S of the pawl 63 slides against the gear 62, causing the pawl 63 to oscillate and the gear 62 to be able to rotate. On the other hand, when the gear 62 rotates clockwise when viewed from the left-right direction (the axial direction of the gear 62), the pawl 63 engages with the gear 62, restricting the rotation of the gear 62. As a result, the gear 62 can only rotate counterclockwise, in which case the inclined portion 63S of the pawl 63 slides against the gear 62. Consequently, the torsional rotation of the stretch film F can be controlled to rotate in only one direction.

[0048] The claw support portion 64 supports the claw 63 so that it can swing. The claw support portion 64 is fixed to the clutch body 61. The claw support portion 64 is constructed by combining hollow aluminum pipes.

[0049] The claw biasing section 65 biases the upper side of the claw 63 (the side opposite to the side that engages with the gear 62) so that the claw 63 swings in the opposite direction to the direction in which it slides with the gear 62. The claw biasing section 65 is made of a hollow aluminum pipe. The claw biasing section 65 is biased by a spring 67 from a claw biasing base section 66 fixed to the unit body 31. With this configuration, when the gear 62 rotates clockwise, the inclined portion 63S of the claw 63 slides with the gear 62, causing the claw 63 to swing, and the claw biasing section 65 biases the claw 63 to swing in the opposite direction to the direction in which it slides with the gear 62. As a result, the gear 62 is held in any position. Consequently, the film retainer 50 can be held at any angle.

[0050] [Take-up mechanism] The winding mechanism 70 will be explained using Figure 10.

[0051] The winding mechanism 70 raises the unit 30 by winding up the fishing line T. The winding mechanism 70 is fixed to the front side of the second support column 22 of the main body 20 at an intermediate point in the vertical direction. The winding mechanism 70 includes a winding cylinder 71, a handle 72, a rotation damper 73, and a gripping part 74.

[0052] The fishing line T is wound onto the winding cylinder 71. The winding cylinder 71 is configured as a short length extending in the left-right direction. The winding cylinder 71 is made of a hollow aluminum pipe. A starting end fixing part 75 is provided at the left end of the winding cylinder 71 to fix the starting end of the fishing line T. The starting end fixing part 75 and the first upper pulley 24 of the main body 20 are offset in the left-right direction. As a result, the fishing line T wound onto the winding cylinder 71 is wound spirally within the winding cylinder 71, and the fishing line T does not interfere with each other. As a result, damage to the fishing line T can be suppressed.

[0053] The handle 72 rotates the winding cylinder 71. The handle 72 is constructed in a roughly L-shape by combining hollow aluminum pipes.

[0054] The rotary damper 73 is interposed between the winding cylinder 71 and the handle 72. For example, an infinite rotation damper is used for the rotary damper 73. The rotary damper 73 reduces the rotation of the handle 72, thereby allowing the winding cylinder 71 to rotate.

[0055] The gripping portion 74 is the part that the operator grips with their other hand when rotating the handle 72 with one hand. The gripping portion 74 is constructed in a roughly L-shape by combining hollow aluminum pipes.

[0056] [leg] The leg 80 will be explained using Figure 11.

[0057] The legs 80 support the film extraction device 10 so that it can move. The legs 80 have a screen body 81, wheels 82, and a weight 83.

[0058] The screen body 81 is configured in a roughly X-shape in plan view. In other words, the screen body 81 has four radially arranged leg sections 84 in plan view. The screen body 81 is constructed by combining multiple hollow pipes. This configuration allows the film retainer 50 to be positioned between the leg sections 84. This allows the film retainer 50 to be lowered close to the ground. As a result, the stretch film F can be wrapped around the side surface of the lower end of the pallet P.

[0059] The wheels 82 move the screen body 81 (film extraction device 10) along it. The four wheels 82 are located at the ends of each leg section 84 of the screen body 81. The wheels 82 are supported so as to be able to rotate freely around an axis in the vertical direction. This allows the operator to freely change the direction of travel of the film extraction device 10. In addition, in a plan view, each wheel 82 is positioned outside the axis of the film roll R supported by the film retainer 50. This allows the film extraction device 10 to run stably.

[0060] The weight 83 is supported on the right side of the script body 81 (to the right of the main body 20). This balances the weight with the unit 30 suspended on the left side of the film extraction device 10 (to the left of the main body 20). As a result, the center of gravity of the film extraction device 10 can be centered.

[0061] [summary] This disclosure is further illustrated by the following embodiments. Configuration 1: An emergency stop mechanism for bringing a liftable unit suspended by a string-like wire to an emergency stop, The unit comprises an emergency stop mechanism body provided on the unit, a locking portion provided along the lifting range of the unit, and a locking portion biased by a first spring from the emergency stop mechanism body toward the locking portion, The locking portion comprises a first rack and a first pulley on which the string-like wire is placed. The locking portion has a second rack with which the first rack engages, The aforementioned string-like wire is stretched in a first direction from the emergency stop mechanism body, placed over the first pulley, and stretched in a second direction. Under normal conditions, the locking portion separates from the locked portion against the biasing force of the first spring due to the tension of the string-like wire; in the event of an abnormality where the tension of the string-like wire falls below a predetermined tension, the locking portion is biased by the first spring, causing the first rack to engage with the second rack and lock into the locked portion. Emergency stop mechanism. Configuration 2: The emergency stop mechanism described in Configuration 1, The biasing direction of the first spring is parallel to the first direction. Emergency stop mechanism. Configuration 3: A mobile stretch film dispensing device equipped with the emergency stop mechanism described in Configuration 1, The unit has a film retainer that holds a roll of stretch film. Mobile stretch film dispensing device. Configuration 4: The mobile stretch film dispensing device described in configuration 3, The film retainer is rotatable in only one direction when rotating around the radial axis of the stretch film roll by a one-way clutch mechanism. The one-way clutch mechanism comprises a gear fixed to the film retainer, a pawl pivotably mounted on the gear, which meshes with the gear, slides against the gear when the gear rotates in one direction, and meshes with the gear to restrict the rotation of the gear when the gear rotates in another direction, and a second spring that biases the pawl in the opposite direction to the direction in which the pawl slides and rotates relative to the gear. Mobile stretch film dispensing device. Configuration 5: The mobile stretch film dispensing device described in configuration 3, The aforementioned string-like wire is wound up by a winding mechanism. The winding mechanism comprises a winding cylinder onto which the string-like wire is wound, a handle for turning the winding cylinder, and a rotation damper interposed between the handle and the winding cylinder. Mobile stretch film dispensing device. Configuration 6: A mobile stretch film dispensing device as described in configuration 5, The starting end of the string-like wire is fixed to the winding cylinder. The aforementioned string-like wire is placed on a second pulley located above the winding mechanism. The starting end of the string-like wire and the second pulley are offset in the direction along the winding cylinder. Mobile stretch film dispensing device. Composition 7: The mobile stretch film dispensing device described in configuration 3, The aforementioned film retainer is A fixed support portion that supports one side of the stretch film roll in the axial direction, A tapered movable support portion that supports the other side of the stretch film roll in the axial direction, A third spring biases the movable support portion toward the fixed support portion, Having, Mobile stretch film dispensing device. Composition 8: A mobile stretch film dispensing device according to claim 3, It has legs that support it so that it can move, The aforementioned legs are configured in an X shape in plan view, Wheels are provided at the tips of the aforementioned legs. The axis of the stretch film roll supported by the film retainer is located inward from the wheel in a plan view. Mobile stretch film dispensing device.

[0062] It should be noted that this disclosure is not limited to the embodiments and their modifications described above, and various changes and improvements are possible within the scope of the claims of this application. [Explanation of symbols]

[0063] 10 Film pull-out device (mobile stretch film pull-out device), 20 Main body, 21 First support column, 22 Second support column (locking part), 23 Pulley support part, 24 First upper pulley, 25 Second upper pulley (second pulley), 30 Unit, 31 Unit body, 40 Emergency stop mechanism, 41 Emergency stop mechanism body, 42 Locking part, 43 First rack, 44 Second rack, 45 Roller, 46 Ring, 47 Tension sensing pulley (first pulley), 48 Locking spring (first spring), 50 Film retainer, 51 Fixed support, 52 Movable support, 53 Fixed support part, 54 Pressing part, 55 Gripping part, 56 Movable support part, 57 Guide part, 58 Holding spring (third spring), 59 Gripping part, 60 One-way clutch mechanism, 61 Clutch body, 62 Gear, 63 Claw, 63S Inclined part, 64 Claw support part, 65 Claw biasing part, 66 Claw biasing base part, 67 Spring (second spring), 70 Winding mechanism, 71 Winding cylinder, 72 Handle, 73 Rotation damper, 74 Gripping part, 75 Starting end fixing part, 80 Leg, 81 Leg body, 82 Wheel, 83 Weight, 84 Leg branch part, B Cardboard box, F Stretch film, P Pallet, R Film roll, T Fishing line

Claims

1. An emergency stop mechanism for bringing a liftable unit suspended by a string-like wire to an emergency stop, The unit comprises an emergency stop mechanism body provided on the unit, a locking portion provided along the lifting range of the unit, and a locking portion biased by a first spring toward the locking portion from the emergency stop mechanism body, The locking portion comprises a first rack and a first pulley on which the string-like wire is placed. The locking portion has a second rack into which the first rack engages, The aforementioned string-like wire is stretched in a first direction from the emergency stop mechanism body, placed over the first pulley, and stretched in a second direction. Under normal conditions, the locking portion separates from the locked portion against the biasing force of the first spring due to the tension of the string-like wire; in the event of an abnormality where the tension of the string-like wire falls below a predetermined tension, the locking portion is biased by the first spring, causing the first rack to engage with the second rack and lock into the locked portion. Emergency stop mechanism.

2. An emergency stop mechanism according to claim 1, The biasing direction of the first spring is parallel to the first direction. Emergency stop mechanism.

3. A mobile stretch film dispensing device equipped with the emergency stop mechanism described in claim 1, The unit has a film retainer that holds a roll of stretch film. Mobile stretch film dispensing device.

4. A mobile stretch film dispensing device according to claim 3, The film retainer is rotatable in only one direction when rotating around the radial axis of the stretch film roll by a one-way clutch mechanism. The one-way clutch mechanism comprises a gear fixed to the film retainer, a pawl pivotably mounted on the gear, which meshes with the gear, slides against the gear when the gear rotates in one direction, and meshes with the gear to restrict the rotation of the gear when the gear rotates in another direction, and a second spring that biases the pawl in the opposite direction to the direction in which the pawl slides and rotates relative to the gear. Mobile stretch film dispensing device.

5. A mobile stretch film dispensing device according to claim 3, The aforementioned string-like wire is wound up by a winding mechanism. The winding mechanism comprises a winding cylinder onto which the string-like wire is wound, a handle for turning the winding cylinder, and a rotation damper interposed between the handle and the winding cylinder. Mobile stretch film dispensing device.

6. A mobile stretch film dispensing device according to claim 5, The starting end of the string-like wire is fixed to the winding tube. The aforementioned string-like wire is placed on a second pulley located above the winding mechanism. The starting end of the string-like wire and the second pulley are offset in the direction along the winding cylinder. Mobile stretch film dispensing device.

7. A mobile stretch film dispensing device according to claim 3, The aforementioned film retainer is A fixed support portion that supports one side of the stretch film roll in the axial direction, A tapered movable support portion that supports the other side of the stretch film roll in the axial direction, A third spring biases the movable support portion toward the fixed support portion, Having, Mobile stretch film dispensing device.

8. A mobile stretch film dispensing device according to claim 3, It has legs that support it so that it can move, The aforementioned legs are configured in an X shape in plan view, Wheels are provided at the tips of the aforementioned legs. The axis of the stretch film roll supported by the film retainer is located inward from the wheel in a plan view. Mobile stretch film dispensing device.

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