JP5308690B2 - lift device - Google Patents

Description

  The present invention relates to an elevating device that elevates and lowers an elevating body (for example, a lighting fixture) supported by being suspended from a high place by winding and unwinding a winding drum.

  Conventionally, in a large structure with a relatively high ceiling such as a concert hall, a gymnasium, a convention hall, etc., an elevating device for the luminaire has been used to facilitate maintenance of the luminaire mounted on the ceiling. The lifting device mainly includes a lifting body to which a lighting fixture is connected, a suspension material that suspends and supports the lifting body, a winding drum that moves the lifting body up and down via the suspension member, and a winding drum that is fixed to the ceiling. (For example, patent documents 1 and 2).

  When installing the lifting device on the ceiling of a structure, etc., the length of the suspension material is set to an appropriate usage length according to the distance from the floor to the ceiling. It is possible to move up and down between a position raised near the ceiling to be used and a position lowered near the floor in order to perform maintenance of the lighting fixture.

  In such a lifting device, when an abnormal state is detected during winding or unwinding rotation of the winding drum, the rotation is automatically stopped, or it is detected that the lifting body has come to a predetermined stop position. Then, an automatic stop mechanism for automatically stopping the rotation is provided.

For example, detection items for stopping the unwinding rotation during the unwinding rotation of the winding drum include (i) sag detection for detecting a state in which the tension applied to the hanging material is reduced below a predetermined value, and (ii) the hanging material. Reversal detection to detect that the roll has been completely unwound from the take-up drum and started to be taken up in the reverse direction, and (iii) the lifting body has reached a preset bottom dead center near the floor surface For example, bottom dead center detection can be considered. In addition, the detection items for stopping the winding rotation during the winding rotation of the winding drum are (i) swing detection for detecting that the lifting body supported by the suspension material swings, and (ii) near the ceiling. For example, top dead center detection for detecting that the lifting body has reached a preset top dead center, and (iii) overload detection for detecting that the tension applied to the hanger is greater than a predetermined value.
JP 2002-104785 A JP 2004-256279 A

  However, in the prior art, as the number of detection items increases, there is a problem that the number of limit switches increases and the manufacturing cost of the lifting device increases.

  The present invention has been made to solve the above-described problems in the prior art, and provides an elevating apparatus that can suppress an increase in manufacturing cost by sharing one limit switch for a plurality of detection items. Objective.

The invention described in claim 1 is provided with a fixed body fixed to the ceiling, a winding drum rotatably supported by the fixed body, and a winding rotation and unwinding rotation provided on the winding drum. A lifting device that includes a suspension member and a lifting member supported by the suspension member, and that lifts and lowers the lifting member by winding and unwinding rotation of the suspension member by the winding drum. A limit switch for stopping rotation of the take-up drum, and the limit switch is a limit for lowering stop for stopping the unwind rotation of the take-up drum when the push button is pressed during the unwind rotation of the take-up drum. switches and, and a limit switch for increased stopping to stop the winding rotation of the winding drum to be push button during winding rotation of the winding drum, 3 or more to stop the rotation of the winding drum Each detection Eyes in correspondence, a limit switch for the descent stop configured to push button via a common single detection dog, the detection items during unwinding rotation of the winding drum, the tension on the hanging member Sagging detection for detecting that it has become smaller than a predetermined value, bottom dead center detection for detecting that the lifting body has reached a preset bottom dead center near the floor surface, and the suspension member is the winding drum completely inverting sensing unwound by detecting that began wound in the opposite direction to the winding drum, Ri of 3 Tsudea, and 3 or more of each detection to stop the rotation of the winding drum from Corresponding to the item, the lift stop limit switch is pushed through one common detection doc, and the detection item during the winding rotation of the winding drum has a tension applied to the suspension member. Greater than the predetermined value Overload detection to detect that, the top dead center detection to detect that the lifting body has reached a top dead center preset in the vicinity of the ceiling, and the lifting body supported by suspension from the suspension This is characterized in that there are three types of vibration detection.

  According to the present invention, since the detection dog corresponding to each detection item can be shared by one detection dog and one limit switch can be shared, the number of parts of the detection dog and limit switch is reduced, and the manufacturing cost can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings.

  1-23 has shown the raising / lowering apparatus of one Embodiment of this invention. As shown in FIG. 1, the lifting device of the present embodiment is fixed to the ceiling, the winding drum 2 supported by the fixing body 1, and the winding drum 2 is wound or unwound. For example, a suspension member 3 made of a metal wire, a pulley 5 for hanging the suspension member 3 unwound from the take-up drum 2 and hanging the suspension member 3 in a downward direction, and a pulley And an elevating body 6 that is suspended and supported by a suspension member 3 that is suspended from 5. In this embodiment, the tip of the suspension member 3 fed out from the winding drum 2 passes through pulleys 4 and 5 provided on the fixed body 1, and further has pulleys 7 and 8 provided on the lifting body 6. Via, it is finally fixed to the fixing part 9 of the fixed body 1.

  When the take-up drum 2 is rotated in one direction, the suspension material 3 is taken up by the take-up drum 2 and the elevating body 6 is raised. When the take-up drum 2 is rotated in the reverse direction, the suspension material 3 is taken up by the take-up drum 2. The lifting body 6 is unwound and descends.

  As shown in FIGS. 2 and 3, the fixed body 1 is formed in a box shape that opens upward, and an accommodation recess 11 that can accommodate the elevating body 6 is recessed upward on the bottom wall of the fixed body 1. And when the elevating body 6 is raised, the elevating body 6 fits in the receiving recess 11 and is stationary in a stable state in which the elevating body 6 is prevented from swinging or rotating. Become. In addition, although the fixed body 1 is attached and fixed to a ceiling, in that case, it may be directly attached to the lower side of a ceiling surface, and may be embed | buried under the ceiling surface.

  The lifting body 6 of the present embodiment is connected to a lighting fixture (not shown), and the lighting fixture attached to the lifting body 6 by the winding rotation and unwinding rotation of the suspension member 3 by the winding drum 2. Can be moved up and down. Therefore, the maintenance work of the lighting fixture can be performed safely and easily at the position where the elevating body 6 is lowered near the floor surface.

  As shown in FIG. 2, a winding mechanism for winding the suspension member 3 is accommodated in the fixed body 1, and this winding mechanism rotates the winding drum 2 and the winding drum 2. A reversible electric motor 21 and a reduction unit 23 that transmits the rotation of the drive shaft of the electric motor 21 to the winding drum 2 are provided. In this case, the speed reduction unit 23 is composed of a plurality of gear trains and transmits power from the electric motor 21 to the winding drum 2, but the rotation of the winding drum 2 is transmitted to the electric motor 21 in reverse. It has a self-locking function to prevent it.

  2 and 3, when it is detected that a predetermined state is reached during winding and unwinding rotation by the winding drum 2, the winding drum 2 rotates in the fixed body 1 as shown in FIGS. An automatic stop mechanism 30 that automatically stops is housed.

(Automatic stop mechanism)
Hereinafter, the automatic stop mechanism 30 will be described in more detail with reference mainly to FIGS.

  4 is a perspective view seen from above, FIG. 5 is a perspective view seen from below, FIG. 6 is a front view, FIG. 7 is a left side view, FIG. 8 is a bottom view, and FIG. It is the figure which removed the bracket and the detection dog from the base main body in the front view.

  As shown in FIGS. 4 to 9, the automatic stop mechanism 30 includes a base 31 fixed to the fixed body 1, the pulley 5 rotatably supported by the base 31, and a limit switch fixed to the base 31. 37, 39 and a plurality of detection dogs 51, 53, 55, 63 supported by the base 31 are integrally assembled.

  As shown in FIG. 4, the base 31 of the automatic stop mechanism 30 is configured in combination with a resin base body 31a and metal brackets 31b and 31c fixed to the base body 31a.

  As shown in FIG. 9, the base main body 31 a includes spring accommodating portions 34 a and 34 b that accommodate the spring members 35 a and 35 b, and a shelf portion 32 that cantileverally supports the pulley shaft 33 that is the rotation shaft of the pulley 5. The pulley shaft 33 is supported at one end 33a of the pulley shaft 33 by the shelf portion 32, and the other end 33b of the pulley shaft 33 is urged and supported from below by spring members 35a and 35b. Therefore, the pulley shaft 33 has the other end 33b rotatable in the vertical direction around the shelf portion 32 supporting the one end 33a (see FIGS. 10 and 23). Accordingly, when the downward force applied to the pulley 5 through the suspension member 3 increases, the pulley 5 moves downward (see FIG. 23), and when the downward force applied to the pulley 5 decreases, the pulley 5 moves upward. As a result, the impact due to the change in the tension of the suspension member 3 is buffered by the spring members 35a and 35b. A spring washer portion 51b of an overload detection plate 51 described later is interposed between the upper end of the spring member 35b and the pulley shaft 33, and the upper end of the spring member 35b and the pulley shaft 33 are in direct contact with each other. Absent.

  As shown in FIG. 4, one of the two limit switches 37 and 39 is fixed to the base body 31a via the first bracket 31b.

  Specifically, as shown in FIG. 4, the fixing plate portion 41 of the first bracket 31b is fixed to the front wall surface of the base body 31a with screws, and the fixing plate portion 41 of the first bracket 31b is A limit switch 39 is fixed to the mounting plate 43 erected at a right angle by screws.

  An overload detection plate 51 as an overload detection dog is slidably interposed between the fixed plate portion 41 of the first bracket and the front wall surface of the base body 31a (see FIGS. 6 and 9). ). As shown in FIGS. 6 and 9, the overload detection plate 51 extends along the spring member 35b and has a frame-like plate-like main body portion 51a, and a spring standing at a right angle from the upper end of the plate-like main portion 51a. A spring washer portion 51b interposed between the upper end of the member 35b and the pulley shaft 33, and a pressing piece 51d erected at right angles from the upper end portion of the central opening 51c of the plate-like main body portion 51a. Yes. Thus, since the spring washer portion 51b of the overload detection plate 51 is interposed between the upper end of the spring member 35b and the pulley shaft 33, the spring member 35b expands as shown in FIG. When the upper end rises, the entire overload detection plate 51 rises. Conversely, as shown in FIG. 23, when the spring member 35b is compressed and the upper end of the spring member 35b is lowered, the entire overload detection plate 51 is lowered. It has become. Note that the spring washer portion 51b and the pressing piece 51d of the overload detection plate 51 protrude in opposite directions.

  Further, a slide guide portion 45 is erected at a right angle from the lower end portion of the fixed plate portion 41 of the first bracket 31b so as to wrap around the lower surface side of the base body 31a. A swing detection plate 55 as a swing detection dog is slidably supported between the lower surface of 31a (see FIG. 18). The sliding direction of the shake detection plate 55 is the X direction in the figure. When the shake detection plate 55 slides in the X direction in the drawing as shown in FIGS. 18A to 18B, the limit switch 39 is caused by a dog-shaped cam portion 55b standing from the main body portion 55a of the shake detection plate 55. The hinge lever 39c of the limit switch 39 is pushed and the switch is turned on. In addition, as shown in FIG. 8, the shake detection plate 55 is formed in a direction orthogonal to the sliding direction (X direction in the figure) by a pair of swinging fulcrums 57, 57 protruding from the lower surface of the base body 31a (see FIG. 8). It can be swung like a seesaw as shown in FIG. 19 with the rocking fulcrums 57 and 57 as the center. When the shake detection plate 55 swings as shown in FIGS. 19A to 19B, the cam portion 55b of the shake detection plate 55 pushes the plunger 39b while pushing the hinge lever 39c of the limit switch 39, thereby Switch on.

  As shown in FIGS. 4 to 6, a top dead center detection plate 53 as a top dead center detection dog is attached to the fixed plate portion 41 of the first bracket so as to be rotatable about its rotation shaft 54. ing.

As shown in FIG. 6, the top dead center detection plate 53 includes a top dead center sensor portion 53b, a pressure receiving piece 53c for overload detection, and a pressing piece 53a (see FIG. 5). Yes.

  As will be described in detail later, the top dead center sensor unit 53b is pressed by the elevating body 6 that has reached the top dead center as shown in FIG. The pressure receiving piece 53c is rotated by the pressing piece 51d of the overload detecting plate 51 that descends when the spring member 35b is compressed as shown in FIG. When the top dead center detecting plate 53 rotates in this way, the pressing piece 53c of the top dead center detecting plate 53 causes the pressure receiving piece 55c of the shake detecting plate 55 to be rotated as shown in FIG. By pushing in the X direction in the figure, the shake detection plate 55 slides in the X direction in the figure. When the shake detection plate 55 slides in the X direction, as described above, the hinge lever 39c of the limit switch 39 is pushed by the cam portion 55b of the shake detection plate 55, the plunger 39b is pushed, and the switch is turned on.

  On the other hand, of the two limit switches 37, 39, the other limit switch 37 is fixed to the base body 31a via the second bracket 31c as shown in FIG.

  Specifically, as shown in FIG. 4, the fixing plate portion 59 of the second bracket 31c is fixed to the upper wall surface of the base body 31a with screws, and the fixing plate portion 59 of the second bracket 31c is A limit switch 37 is fixed to a mounting plate 61 erected at a right angle by screws. A composite detection dog 63 is attached to the attachment plate portion 61 of the second bracket so as to be rotatable about a rotation shaft 64 (see FIG. 11). When the composite detection dog 63 rotates as shown in FIGS. 11A to 11B, the pressing portion 63 b of the composite detection dog 63 is pressed by the hinge lever 37 c of the limit switch 37, thereby the plunger of the limit switch 37. 37b is pushed and switched on.

  Next, the operation of the automatic stop mechanism 30 configured as described above will be described.

  In the present embodiment, the detection item for stopping the winding rotation of the winding drum 2 to stop the lowering of the elevating body 6 is (i) when detecting that the tension applied to the suspension member 3 has become smaller than a predetermined value. (Sag detection), (ii) when it is detected that the suspension member 3 has been completely unwound from the winding drum 2 and started to be wound around the winding drum 2 in the opposite direction (reversal detection), and (iii) ) When it is detected that the lifting body 6 has reached a preset bottom dead center near the floor (bottom dead center detection), and the winding rotation of the winding drum 2 is stopped. The detection items for stopping the lifting of the lifting body 6 are (i) the case where it is detected that the lifting body 6 suspended and supported by the suspension member 3 is shaking (swing detection), and (ii) preset near the ceiling. When it is detected that the lifting body 6 has reached the top dead center (top dead center detection), and (iii) the hanger 3 When the tension applied is detected that is greater than a predetermined value (overload detection), a.

  In the present embodiment, one limit switch 37 is a lowering stop limit switch that stops the unwinding rotation of the winding drum 2 when it is pressed during the unwinding rotation of the winding drum 2. The limit switch 39 is a limit switch for ascending / stopping that stops the winding rotation of the winding drum 2 when the push button is pressed during the winding rotation of the winding drum 2, and there is one limit switch for lifting and lowering respectively. It is provided one by one.

  Hereinafter, the operation in each detection item will be described.

(Descent stop)
First, detection items (sag detection, bottom dead center detection, reversal detection) during descent will be described.

(I) Sag detection FIGS. 10 and 11 are diagrams for explaining sagging detection by an automatic stop mechanism. FIG. 10 (a) corresponds to FIG. 6 before sagging detection, and FIG. 10 (b) corresponds to FIG. FIG. 11A is a diagram corresponding to FIG. 7 showing a state before sag detection, and FIG.

  In the sagging detection, when the state where the tension applied to the suspension member 3 is decreased to a value less than a predetermined value while the elevating body 6 is being lowered, the descent of the elevating body 6 is stopped.

  Specifically, as shown in FIGS. 10A to 10B, when the tension applied to the suspension member 3 decreases and the downward force applied to the pulley shaft 33 decreases, the other end 33b of the pulley shaft 33 is Move upward. Then, the other end 33b of the pulley shaft 33 pushes up the first rotation end 63a of the composite detection dog 63 as shown in FIGS. The pushed up first rotation end 63a pushes up the hinge lever 37c of the limit switch 37 for stopping the lowering, and pushes the plunger 37b of the limit switch 37. Thereby, electricity supply to the electric motor 21 of the winding drum 2 is stopped, and the rotation of the winding drum 2 is stopped.

  In this way, in the slack detection, when the tension applied to the suspension member 3 is reduced below a predetermined value, the elevating body 6 stops descending. For example, the suspension member 3 is cut halfway and the suspension member 3 is slackened. For example, the lifting body 6 may be moved to an abnormal state in which the lifting body 6 rides on an obstacle while the lifting body 6 is descending, or when the operator does not need to receive and lift the lifting body 6 when the lifting body 6 is lowered. Can stop automatically.

  In the sagging detection, the other end 33b of the pulley shaft 33 is a detected portion. Further, the first rotation end 63a of the composite detection dog 63 is a sag detection sensor unit that detects the movement of the detected portion 33b for sag detection and presses the hinge lever 37c of the limit switch 37 for lowering stop. It will be configured as a part.

(Ii) Reversal Detection FIGS. 12 and 13 are diagrams for explaining reversal detection by an automatic stop mechanism. FIG. 12 (a) corresponds to FIG. 3 before reversal detection, and FIG. 12 (b) corresponds to FIG. FIG. 13A is a view corresponding to FIG. 7 showing the state before the reversal detection, and FIG.

  In the reverse detection, when it is detected that the suspension member 3 has been completely unwound from the take-up drum 2 during unwinding rotation, the rewinding of the take-up drum 2 starts. The rotation is stopped.

  Specifically, as shown in FIG. 12A, when the take-up drum 2 is unwinding (rotating counterclockwise in FIG. 12), the elevating body 6 is lowered. When 3 is unwound from the winding drum 2, the suspension material 3 starts to be wound around the winding drum 2 in reverse, as shown in FIG. Thus, when the suspension material 3 is wound around the winding drum 2 in the reverse direction, the position of the suspension material 3 stretched between the winding drum 2 and the pulley 4 changes (FIG. 12A). (Refer to (b)). As a result, as shown in FIGS. 12 (b) and 13 (b), the suspension member 3 is turned over at the second rotation end 63 b of the composite detection dog 63. The sensor part 63c is pushed down, and thereby the first rotation end 63a of the composite detection dog 63 is pushed up. Then, the first rotation end 63a of the composite detection dog 63 pushes the plunger 37b via the hinge lever 37c of the limit switch 37 for stopping the lowering, thereby energizing the electric motor 21 of the winding drum 2. The rotation of the winding drum 2 is stopped.

  In such reversal detection, it is possible to prevent the lifting and lowering body 6 from being lowered by unwinding and rotating the winding drum 2 but rising. In the reversal detection, the hanging material 3 becomes a detected portion.

(Iii) Bottom dead center detection FIG. 14 is a diagram for explaining bottom dead center detection by an automatic stop mechanism, FIG. 14 (a) is before bottom dead center detection, and FIG. 14 (b) is when bottom dead center is detected. It is a figure corresponding to FIG.

  In the bottom dead center detection, when the lifting body 6 is detected to have reached the bottom dead center, the descending of the lifting body 6 is stopped. Note that the bottom dead center is set in advance, for example, at the time of ceiling installation of the lifting device, and is set to a position higher than the floor surface, that is, a height at which an operator can easily maintain the lifting body 6. .

  Specifically, as shown in FIGS. 2 and 14, a rotating plate 67 connected to the rotating shaft of the winding drum 2 via a plurality of reduction gears 65 is provided. A projection 69 is provided as a detected portion for the purpose. Then, when the winding drum 2 is unwound and rotated to a position corresponding to the bottom dead center described above, the protrusion 69 of the rotating plate 67 is moved to the composite detection dog 63 as shown in FIGS. The inversion / bottom dead center sensor unit 63c provided at the second rotation end 63b is pushed down. Then, the first rotation end 63a of the composite detection dog 63 pushes the plunger 37b through the hinge lever 37c of the limit switch 37 for lowering stop. Thereby, electricity supply to the electric motor 21 of the winding drum 2 is stopped, and the rotation of the winding drum 2 is stopped. The setting of the bottom dead center can be changed by changing the fixed position of the protrusion 69 with respect to the rotating plate 67.

  In such a bottom dead center detection, the operator can automatically stop the elevator 6 at a height at which the elevator 6 can be easily maintained without inadvertently lowering the elevator 6 to the floor. In detecting the bottom dead center, the protrusion 69 of the rotating plate 67 serves as a detected portion.

  As described above, in the present embodiment, detection corresponding to each detection item is provided without providing a limit switch for each of the three detection items (sag detection, reversal detection, and bottom dead center detection) while the lifting body 6 is descending. Since one combined detection dog 63 shares a dog while one descent stop limit switch 37 is shared, the number of parts of the detection dog and limit switch is reduced, and the manufacturing cost can be reduced.

(Raising stop)
Next, detection items (swing detection, top dead center detection, overload detection) during ascent will be described.

(I) Shake Detection FIGS. 15 to 19 are diagrams for explaining shake detection by an automatic stop mechanism. 15 is a schematic view showing a state in which the lifting body 6 swings in the X direction, FIG. 16 is a schematic view showing a state in which the suspension members 3 are entangled, and FIG. ) Is a view showing the detection of the shaking when the suspension member 3 is swung in the X direction as shown in FIGS. 15 and 16. 18 is a schematic view showing a state in which the elevating body 6 swings in the Y direction. FIG. 19A shows the state before the swing is detected, and FIG. 19B shows the suspension member 2 swings in the Y direction as shown in FIG. It is a figure which shows the shake detection at the time of hitting.

  In the shake detection, when it is detected that the elevating body 6 that is suspended and supported by the hanger 3 swings, the elevating body 6 stops rising. As a result, the lifting body 6 is shaken by a disturbance such as an earthquake, wind, etc., so that the lifting body 6 does not fit in the housing recess 11 of the fixed body 1 that is the top dead center and stops at an unstable position that is displaced. Can be prevented.

  For example, when the lifting / lowering body 6 swings in the X direction as shown in FIG. 15 or when the suspension member 3 is twisted and entangled as shown in FIG. 16, as shown in FIGS. The suspension member 3 moves in the X direction within the suspension member insertion hole 55d of the vibration detection plate 55. Then, as shown in FIGS. 17 (a) → (b), the whole shake detection plate 55 moves in the X direction, and the limit switch 39 for stopping the rise is moved by the square cam portion 55b of the shake detection plate 55. The hinge lever 39c is pushed, the plunger 39b is pushed, the energization to the electric motor 21 of the winding drum 2 is stopped, and the rotation of the winding drum 2 is stopped.

  On the other hand, as shown in FIG. 18, when the elevating body 6 swings in the Y direction, the suspension member 3 is in the suspension member insertion hole 55 d of the vibration detection plate 55 as shown in FIGS. To move in the Y direction. Then, as shown in FIGS. 18A to 18B, the swing detection plate 55 swings like a seesaw around the swing fulcrum 57. As a result, the roller 39d at the tip of the hinge lever 39c of the limit switch 39 for stopping the lift moves so as to ride on the cam portion 55b of the shake detection plate 55, whereby the hinge lever 39c of the limit switch 39 is pushed. The plunger 39b is pushed. Thereby, electricity supply to the electric motor 21 of the winding drum 2 is stopped, and the rotation of the winding drum 2 is stopped.

  In such a shake detection, it is possible to prevent the elevating body 6 from stopping at an unstable position that is displaced without being accommodated in the housing recess 11 of the fixed body 1 that is the top dead center. It should be noted that the hanging material 3 serves as a detected part in the shake detection.

(Ii) Top Dead Center Detection FIGS. 20 to 22 are diagrams for explaining top dead center detection by the automatic stop mechanism. 20 (a) is a view corresponding to FIG. 6 showing the time when top dead center is detected, FIG. 20 (b) is a view corresponding to FIG. 6, and FIG. 21 is an enlarged view showing only the main part in FIG. FIG. 22A is a view corresponding to FIG. 8 showing the state before detecting the top dead center, and FIG.

  In the top dead center detection, when it is detected that the lifting body 6 has reached a preset top dead center, the lifting of the lifting body 6 is stopped. Thereby, before the overload detection mentioned later operates, the raising / lowering body 6 can be stopped at a predetermined top dead center.

  Specifically, as shown in FIGS. 20A to 20B, when the elevating body 6 reaches the top dead center (in this example, the position completely accommodated in the housing recess 11 of the fixed body 1), the top dead center is reached. The top dead center sensor portion 53 b of the detection plate 53 is pushed up by the elevating body 6, and the entire top dead center detection plate 53 rotates around the rotation shaft 54. When the top dead center detecting plate 53 rotates in this way, the pressing piece 53a of the top dead center detecting plate 53 presses the pressure receiving piece 55c of the shake detecting plate 55 as shown in FIGS. The shake detection plate 55 is slid in the X direction. Then, as the shake detection plate 55 slides in the X direction, as shown in FIGS. 22A to 22B, the cam portion 55b of the shake detection plate 55 is connected to the hinge of the limit switch 39 for stopping lifting. The plunger 39b is pushed through the lever 39c. Thereby, electricity supply to the electric motor 21 of the winding drum 2 is stopped, and the rotation of the winding drum 2 is stopped.

  In such top dead center detection, before overload detection described later is activated, that is, before the overload is applied to the electric motor 21 of the suspension member 3 and the winding drum 2, the lifting body 6 is moved at a predetermined top dead center. You can stop. In the detection of the top dead center, the elevating body 6 is a detected part.

(Iii) Overload detection FIG. 23 is an enlarged view showing only the main part in FIG. 6 for explaining overload detection by the automatic stop mechanism, (a) before overload detection, (b) overload. It is a figure which shows the time of a detection.

  In the overload detection, when the tension applied to the suspension member 3 is detected to be greater than a predetermined value, the lifting of the elevating body 6 is stopped.

  Specifically, for example, the top dead center detection is not activated and the elevating body 6 is further raised beyond the top dead center position, the elevating body 6 is caught by some obstacle, or the elevating body 6 is artificially moved. The tension of the suspension member 3 may increase by pressing it down. When the tension of the suspension member 3 increases in this way, as shown in FIGS. 23A to 23B, a large force is applied to the pulley 5 downward, and the other end 33b side of the pulley shaft 33 is lowered. Become. Then, as shown in FIGS. 23A to 23B, the spring members 35a and 35b are compressed, and the overload detection plate 51 is lowered together with the upper end of the spring member 35b. When the overload detection plate 51 is lowered in this way, the pressing piece 51d of the overload detection plate 51 presses the pressure receiving piece 53c for detecting the overload of the top dead center detection plate 53 and pushes it down, thereby causing the top dead. The entire point detection plate 53 rotates around the rotation shaft 54. When the top dead center detecting plate 53 rotates in this way, the pressing piece 53a of the top dead center detecting plate 53 is shaken as shown in FIGS. 21 (a) → (b) and FIGS. 22 (a) → (b). The pressure receiving piece 55c of 55 is pushed, whereby the shake detection plate 55 slides in the X direction. Then, the cam portion 55b of the fluctuation detecting plate 55 pushes the hinge lever 39c of the limit switch 39 for stopping the lifting, pushes the plunger 39b, stops the energization of the electric motor 21 of the winding drum 2, and winds the winding. The rotation of the drum 2 is stopped.

  As described above, in the overload detection, when the tension of the suspension member 3 increases while the elevating body 6 is raised, and the overload is applied to the suspension member 3 and the electric motor 21 of the winding drum 2, the overload is applied. It can be prevented from continuing. In the overload detection, the other end 33b of the pulley shaft 33 of the pulley 5 serves as a detected portion.

  As described above, in the present embodiment, each of the three detection items (swing detection, top dead center detection, and overload detection) during the ascending / descending body 6 is lifted is not provided with a limit switch and corresponds to each detection item. Since one limit switch 39 for stopping and stopping is shared as a structure for operating the detection plates 51, 53, and 55 one after another, the number of limit switches can be reduced and the manufacturing cost can be reduced.

  The effects of this embodiment are listed below.

  (1) According to the present embodiment, the fixed body 1 fixed to the ceiling, the winding drum 2 rotatably supported by the fixed body 1, and the winding rotation and unwinding rotation on the winding drum 2 A suspension member 3 that is freely provided and is suspended from the fixed member 1, and an elevating member 6 that is suspended and supported by the suspension member 3, and is used to rotate and wind the suspension member 3 by the winding drum 2. A lifting device that lifts and lowers the lifting and lowering body 6 by rotating out, and is provided with a limit switch (in this example, a limit switch 37 for stopping the lowering) that stops the rotation of the winding drum 2 when pressed. Corresponding to each of two or more detection items (in this example, sag detection, reversal detection, bottom dead center detection) that stop the rotation of the drum 2, each detected unit (in this example, as a detection unit for sag detection) The other end 33b of the pulley shaft 33 of the pulley, test for inversion detection The limit switch 37 is provided with a suspension member 3 as a part and a protrusion 69 of a rotating plate 67 as a detected part for detecting a bottom dead center via two common detection dogs 63. Is a push button.

  Therefore, an increase in manufacturing cost can be suppressed by sharing one limit switch 37 with a plurality of detection items.

  (2) Further, according to the present embodiment, there are three detection items (sag detection, bottom dead center detection, and reversal detection in the present embodiment), and the corresponding three detected parts (for slack detection). The limit switch 37 is pushed through one detection dog 63 that is common to the detected portion 33b, the detected portion 3 for detecting reversal, and the detected portion 69 for detecting bottom dead center. That is, since one limit switch can be shared for three detection items, the total number of limit switches can be further reduced, and the manufacturing cost can be further reduced.

  In the present embodiment, when the limit switch 37 is pressed during the unwinding rotation of the winding drum 2, the lowering body 6 is prevented from descending by stopping the unwinding rotation of the winding drum. This is a descent stop limit switch 37. Further, detection items for stopping the unwinding rotation of the winding drum 2 include slack detection for detecting a state in which the tension applied to the suspension member has decreased below a predetermined value, and a bottom dead center set in advance near the floor surface. Bottom dead center detection for detecting that the lifting body has reached, and reversal detection for detecting that the suspension member has been completely unwound from the winding drum and started to be wound in the reverse direction. And three.

(Modification)
As described above, in the present embodiment, one limit switch 37 for lowering and stopping is shared by a plurality of detected parts through one detection dog 63. As will be described, it goes without saying that one limit switch 39 for stopping and stopping may be shared by a plurality of detected parts via one detection dog.

  In the present embodiment, one end of the suspension member 3 is fixed to the fixed body 1 and the other end of the suspension member 3 is wound up by one winding drum 2. However, the present invention is not limited to this. For example, as shown in the modification shown in FIG. 24, two winding drums 2 and 2 may be provided and both ends of the suspension member 3 may be wound around the winding drums 2 and 2, respectively. As shown in the modified example shown in FIG. 1, one end of the suspension member 3 may be fixed to the lifting body 6 and the other end of the suspension member 3 may be wound around the take-up drum 2. The invention can be applied.

  In addition, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the above embodiment are all included in the scope of the present invention.

The conceptual diagram of the raising / lowering apparatus of one Embodiment of this invention. The perspective view from the upper part of the raising / lowering apparatus. Sectional drawing which follows the III-III line | wire in FIG. The perspective view seen from the upper direction of the automatic stop mechanism of the raising / lowering apparatus. The perspective view seen from the downward direction of the automatic stop mechanism. The front view of the automatic stop mechanism. The left view of the automatic stop mechanism. The bottom view of the automatic stop mechanism. The figure which removed the bracket and the detection dog from the base main body in the front view of the automatic stop mechanism of FIG. FIG. 7 is an enlarged view illustrating only a main part in the front view of FIG. 6 in order to explain sag detection by the automatic stop mechanism, in which (a) shows a state before sag detection and (b) shows a time when sag is detected. (A) before slack detection, (b) is a diagram corresponding to FIG. It is explanatory drawing for demonstrating the inversion detection by the same automatic stop mechanism, Comprising: (a) is before an inversion detection, (b) is a figure equivalent to FIG. 3 at the time of an inversion detection. FIG. 9A is a view corresponding to FIG. 7 before reversal detection, and FIG. It is explanatory drawing for demonstrating the bottom dead center detection by the same automatic stop mechanism, Comprising: (a) is a figure before FIG. 7 which shows the time before a bottom dead center detection, (b) is bottom dead center detection. FIG. 3 is a schematic view seen from the Y direction in FIG. 2 showing a state where the lifting body swings in the X direction in FIG. The schematic diagram seen from the Y direction in FIG. 2 which shows the state in which hanging materials are entangled. It is explanatory drawing for demonstrating the shake detection by the same automatic stop mechanism, Comprising: (a) is a normal state before a raising / lowering body shakes, (b) is a figure equivalent to FIG. 8 in the state which a raising / lowering body shakes to a X direction. FIG. 3 is a schematic view seen from the X direction in FIG. 2 showing a state where the lifting body swings in the Y direction in FIG. It is explanatory drawing for demonstrating the shake detection by the same automatic stop mechanism, Comprising: (a) is a normal state before a raising / lowering body shakes, (b) is a figure equivalent to FIG. 8 in the state which a raising / lowering body shakes in a Y direction. FIGS. 7A and 7B are explanatory diagrams for explaining top dead center detection by the automatic stop mechanism, wherein FIG. 7A corresponds to FIG. 6 showing before top dead center detection and FIG. It is a principal part enlarged view which illustrated only the principal part in FIG. 20, Comprising: (a) is before top dead center detection, (b) is a figure which shows the time of top dead center detection. It is explanatory drawing for demonstrating the top dead center detection by the same automatic stop mechanism, Comprising: (a) is before top dead center detection, (b) is a figure equivalent to FIG. 8 which shows the time of top dead center detection. In order to explain overload detection by the automatic stop mechanism, FIG. 6 is an enlarged view showing only a main part in the front view of FIG. 6, wherein (a) shows before overload detection and (b) shows when overload is detected. Figure. The figure equivalent to FIG. 1 which shows the 1st modification of an raising / lowering apparatus. The figure equivalent to FIG. 1 which shows the 2nd modification of an raising / lowering apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fixed body 2 ... Winding drum 3 ... Suspension material (Detected part for inversion detection, Detected part for shake detection)
4 ... pulley 5 ... pulley 6 ... lifting body (detected part of top dead center detection)
DESCRIPTION OF SYMBOLS 7 ... Pulley 9 ... Fixed part 11 ... Accommodating recessed part 21 ... Electric motor 23 ... Deceleration unit 30 ... Automatic stop mechanism 31 ... Base 31a ... Base main body 31b ... 1st bracket 31c ... 2nd bracket 32 ... Shelf part 33 ... Sliding Axle 33a ... one end 33b ... the other end (detected part for detecting slack, detected part for detecting overload)
34a, 34b ... Spring accommodating portion 35a ... First spring member 35b ... Second spring member 37 ... Lower limit switch 37b ... Plunger 37c ... Hinge lever 37d ... Roller 39 ... Limit switch 39b ... Plunger 39c ... Hinge lever 39d ... Roller 41 ... Fixed plate portion 43 ... Mounting plate portion 45 ... Slide guide portion 51 ... Overload detection plate (overload detection dog)
51a ... Plate-shaped main body 51b ... Spring washer 51c ... Central opening 51d ... Pressing piece 53 ... Top dead center detection plate (top dead center detection dog)
53a ... Pressing piece 53b ... Top dead center sensor part 53c ... Pressure receiving piece 54 ... Rotating shaft 55 ... Swing detection plate (swing detection dog)
55a ... Body part 55b ... Cam part 55c ... Pressure receiving piece 55d ... Hanging material insertion hole 57 ... Oscillation fulcrum 59 ... Fixing plate part 61 ... Mounting plate part 63 ... Composite detection dog 63a ... First rotation end 63b ... Second Rotation end 63c ... Reverse / bottom dead center sensor part 64 ... Rotating shaft 65 ... Reduction gear 67 ... Rotating plate 69 ... Protrusion (Detected part for bottom dead center detection)

Claims (1)

A fixed body fixed to the ceiling, a winding drum rotatably supported by the fixed body, a suspension member provided on the winding drum so as to be capable of winding and unwinding rotation, and a suspension member suspended from the suspension member A lifting device that is supported below, and a lifting device that lifts and lowers the lifting body by winding and unwinding rotation of the suspension material by the winding drum,
Provided with a limit switch that stops the rotation of the winding drum when pressed.
The limit switch, said winding the winding unwinding limit switch for lowering stop for stopping the rotation of the drum to be unwinding push button during rotation of the drum, is a push button during winding rotation of the winding drum And a rise / stop limit switch for stopping the winding rotation of the winding drum ,
Corresponding to each of the three or more detection items for stopping the rotation of the winding drum, it is configured to push the lowering stop limit switch via one common detection dog ,
The detection item during unwinding rotation of the winding drum is:
Sag detection for detecting that the tension applied to the suspension member has become smaller than a predetermined value;
Bottom dead center detection for detecting that the lifting body has reached a bottom dead center set in the vicinity of the floor;
Reversal detection for detecting that the suspension material is completely unwound from the winding drum and started to be wound in the reverse direction by the winding drum;
3 of Tsudea is, and
Corresponding to each of the three or more detection items for stopping the rotation of the winding drum, it is configured to push the limit switch for ascending stop through one common detection dock,
The detection item during winding rotation of the winding drum is:
Overload detection for detecting that the tension applied to the hanger is greater than a predetermined value;
Top dead center detection for detecting that the lifting body has reached a top dead center set in the vicinity of the ceiling;
A swing detection for detecting that the lifting body supported by the suspension material swings,
The lifting device characterized by being three.

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