JP4054350B2 - Automatic stop device for tubular motor - Google Patents

Description

  The present invention relates to an automatic stop device for a tubular motor that is installed by being inserted into a cylindrical take-up pipe for taking up curtains such as blinds, sunshades or shutters.

  In general, this type of tubular motor includes a cylindrical frame (also referred to as a casing) disposed concentrically in a take-up pipe and a reduction gear mounted in the frame, as disclosed in, for example, Patent Document 1. An electric motor with a machine, and an output shaft connected to the electric motor so that power can be transmitted, one end extending from one end of the frame to the outside of the frame, and rotatingly connected to the winding pipe via a drive wheel The rotational force of the electric motor is transmitted to the winding pipe via the output shaft and the drive wheel, and the winding pipe is rotationally driven.

  On the other hand, in the case of a shutter device equipped with such a tubular motor, the seat plate at the lower end of the shutter contacts the stopper member or the ceiling or floor of the building at the upper limit position and the lower limit position of the shutter, so that the shutter is rolled up or fed out. In addition to this, it is a common practice to equip tubular motors with an automatic stop device that automatically shuts off the power supply circuit of the electric motor at the shutter stop position. The same applies to blind devices other than the shutter device.

Conventionally, as an automatic stop device equipped in a tubular motor, as disclosed in Patent Documents 2 and 3, for example, a device using a limit switch is known. In other words, this automatic stop device is mounted on the outer periphery of the limit case inserted into the tubular motor frame from the end opposite to the output shaft, and one end of the take-up pipe is integrally rotated. A limit gear to be fitted, a counter type limit switch that is attached to the inside of the limit case and has a plurality of digit wheels that rotate by receiving the rotation of the limit gear via a transmission gear, and a carry-on pinion, and this limit switch And an operation mechanism including a push button for setting the stop position by operating the meshing of the digit wheel and the pinion. The limit case is fixed to the mounting portion of the building as a member for supporting the tubular motor.
Japanese Examined Patent Publication No. 2-26038 Utility Model Registration No. 2536306 JP 2001-329770 A

  However, since the conventional automatic stop device is mechanically complicated, there is a limit to downsizing. Therefore, when the diameter of the take-up pipe is very small, such as a blind device, less than 5 mm, the automatic stop device for the tubular motor inserted and arranged in the take-up pipe is mechanically simple and suitable for downsizing. Is desired.

  The present invention has been made in view of the above points, and the problem is that when a curtain such as a blind or a shutter stops at an upper limit position or a lower limit position, the electric motor side and the output shaft side of the tubular motor. Focusing on the reaction between the motor and the motor, and using this reaction as a trigger that cuts off the power circuit of the electric motor, we do not provide an automatic stop device for a tubular motor that has a simple mechanism and can be easily downsized. It is what.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a tubular motor, as a tubular motor, a cylindrical frame disposed concentrically in a winding pipe that winds up curtains such as blinds and sunshades, The electric motor mounted in the frame, one end is connected to the electric motor, and the other end is extended from one end of the frame to the outside of the frame and is integrally connected to the winding pipe via a drive wheel. It is assumed that an output shaft is provided. As an automatic stop device for the tubular motor, a support structure for supporting the frame and rotatably supporting one end of the take-up pipe is provided on the other end side of the frame. A base member fixed to the mounting portion of the building and rotatably supporting one end of the winding pipe on the outer peripheral surface; and a central shaft extending from the base member into the frame along the center line thereof; A rotating member that is rotatably mounted around the central shaft and fits so that the frame rotates integrally with the outer peripheral surface, and the rotating member rotates within a predetermined angular range around the central shaft. A fixed piece fixed to the central shaft, a spring member that constantly urges the fixed piece and the rotating member to face each other at an intermediate position within the predetermined angle range, and the rotating member to the fixed piece. The detector is configured to detect relative rotation from the intermediate position, and the power supply circuit of the electric motor is configured to be shut off based on a detection signal from the detector.

  In this configuration, when the curtain is stopped at the upper limit position in the direction in which the curtain is wound around the take-up pipe or the lower limit position in the direction in which the curtain is fed out from the take-up pipe, etc., in the tubular motor provided in the take-up pipe, If a load greater than the output is applied to the output shaft and the output shaft cannot rotate, the electric motor remains in operation, so the frame in which the electric motor is mounted is in a direction opposite to the rotation direction of the electric motor. A reaction acts. At that time, among the support structure provided at the end opposite to the output shaft side of the frame, the base member, the central shaft and the fixed piece fixed to the mounting part of the building are immovable, but the frame The rotating member fitted with is rotated against the urging force of the spring member around the central shaft integrally with the frame by the reaction acting on the frame. The detector detects the relative rotational displacement between the rotating member and the fixed piece, and the electric motor power circuit is shut off based on the detection signal of the detector, so that the electric motor Operation stops.

  According to a second aspect of the present invention, in the tubular motor automatic stop device according to the first aspect, a specific form of the rotating member and the spring member is provided. That is, the rotating member has a pair of protrusions extending so as to sandwich the fixed piece, and when rotating around the central shaft, each protrusion comes into contact with the fixed piece and the rotation is restricted. The spring member is formed of a wire spring that passes through the central shaft perpendicularly and whose both ends are sandwiched between a pair of protrusions of the rotating member.

  The invention according to claim 3 provides a specific form of the detector in the automatic stop device for tubular motor according to claim 2. That is, the detector includes a magnet fixed to a fixed piece, a detection control board fixed to a pair of protrusions of a rotating member, and a magnet sensing part provided on the control board facing the magnet. And make up.

  As described above, according to the tubular motor automatic stop device of the present invention, a rotational displacement is generated between the rotating member and the fixed piece by the reaction of the frame that acts when the curtain is stopped. By detecting the displacement with a detector and shutting off the power circuit of the electric motor, the mechanism is simpler than that using a conventional counter type limit switch while ensuring operation reliability. In addition, since the number of components can be reduced, the size can be easily reduced.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments that are the best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows the overall configuration of a tubular motor A equipped with an automatic stop device according to an embodiment of the present invention. The tubular motor A includes a cylindrical frame 2 disposed concentrically in a winding pipe 1 that winds up curtains (not shown) such as blinds and sunshades, and one end side in the frame 2. An electric motor 3 with a speed reducer attached to the motor, one end connected to the electric motor 3, and the other end of the output shaft 4 extending from one end of the frame 2 to the outside of the frame 2, and the other end of the output shaft 4 Drive wheel 5 and electromagnetic clutch 6 mounted at the end extending outside the frame 2, that is, the power control board 7 disposed at the center in the frame 2, and mounted at the other end of the frame 2. And a support structure 8.

  The drive wheel 5 is connected to the winding pipe 1 in a rotationally integrated manner by a coupling or engaging structure, and is connected to the output shaft 4 in a rotationally integrated manner via an electromagnetic clutch 6. When the electromagnetic clutch 6 is in the connected state, the rotational force of the electric motor 3 is transmitted to the take-up pipe 1 through the output shaft 4, the electromagnetic clutch 6 and the drive wheel 5, and the take-up pipe 1 takes up the curtain-like material. It rotates in the direction or feeding direction. The power control board 7 is for controlling the power supplied to the electric motor 3 and the electromagnetic clutch 6.

  The support structure 8 is for supporting the frame 2 and thus the tubular motor A in a cantilever state and rotatably supporting one end of the take-up pipe 1. As shown in detail in FIGS. 2 to 6, the support structure 8 includes a base member 11 that is fixed to a mounting portion of a building, and a center that extends from the base member 11 into the frame 2 along its center line. A shaft 12, a rotating member 13 that is rotatably mounted around the central shaft 12, and the frame 2 is fitted to the outer peripheral surface, and is fixed to the central shaft 12 adjacent to the distal end surface of the rotating member 13. The fixed piece 14 is provided.

  The base member 11 is formed by screwing a large-diameter portion 11a having a substantially bottomed cylindrical shape whose outer diameter is substantially the same as that of the winding pipe 1 and a small-diameter portion 11b having a substantially cylindrical shape whose outer diameter is substantially the same as that of the frame 2. 15 and 15 are combined. On the peripheral edge of the large-diameter portion 11a of the base member 11, three through holes 16 through which mounting bolts (not shown) for fixing to the mounting portion of the building are passed are formed at equal intervals in the circumferential direction. A limit ring 17 is rotatably mounted on the outer peripheral surface of the small diameter portion 11b of the base member 11, and one end of the winding pipe 1 is rotatably supported via the limit ring 17. Further, a stepped hole 18 is provided on the center line of the small diameter portion 11 b of the base member 11, and one end of the center shaft 12 is fitted into the stepped hole 18 and fixed by a screw 19.

  Concave portions 21 and 21 are formed on the outer peripheral surface of the rotating member 13 at two positions sandwiching the center line thereof, and one end of the frame 2 fitted to the outer peripheral surface of the rotating member 13 is set inward in each of the concave portions 21. The hook portion 22 that is bent is engaged, so that the rotating member 13 and the frame 2 rotate integrally. Further, the rotating member 13 has a pair of projecting portions 23 a and 23 b extending to the tip side (the back side in the frame 2) so as to sandwich the fixed piece 14. The fixed piece 14 includes a boss portion 14a that is non-rotatably fitted to the central shaft 12, and a bulging portion 14b that bulges from the boss portion 14a to the side in a substantially rhombus shape. When the rotating member 13 rotates about the central shaft 12, the protrusions 23 a and 23 b of the rotating member 13 come into contact with the side surface of the bulging portion 14 b of the fixed piece 14 so that the rotation is restricted. The rotating member 13 is provided so as to rotate around the central shaft 12 within a predetermined angle range in relation to the fixed piece 14.

  The support structure 8 further includes a spring member 25 that constantly urges the rotating member 13 and the fixed piece 14 to face each other at an intermediate position within the predetermined angle range, and the rotating member 13 is a fixed piece. 14 and a detector 26 for detecting the relative rotation from the intermediate position. In the case of this embodiment, the spring member 25 penetrates perpendicularly to the tip of the center shaft 12, and both ends are formed by notching a bifurcated shape at each tip of the pair of protrusions 23 a and 23 b of the rotating member 13. It consists of the wire spring each clamped by the clamped part 23c. The detector 26 has a permanent magnet 27 fixed to the tip surface of the bulging portion 14b of the fixed piece 14, and a chip-shaped detection fixed to the pair of protrusions 23a and 23b of the rotating member 13 by pin coupling. 7 and a magnet sensing portion 29 mounted on the back surface (the surface facing the fixed piece 14) of the control board 28 so as to face the permanent magnet 27 as shown in FIG. The detection signal of the detector 26 is output from a connection terminal 30 provided on the control board 28 through a lead wire 31 to a relay switch (not shown) mounted on the power supply control board 7. The power supply circuit of the electric motor 3 is cut off based on the signal. The power supply control board 7 and the support structure 8 constitute an automatic stop device 9 for the tubular motor A.

  Next, the operation of the automatic stop device 9 for the tubular motor A will be described with reference to FIGS.

  Now, as shown in FIG. 8, when the output shaft 4 of the tubular motor A is rotating in the winding direction T1 of the curtain, the curtain is wound up to the upper limit position by the winding pipe 1, When the seat plate or the like provided at the lower end of the object hits the stopper member and stops, in the tubular motor A, the electric motor 3 is subjected to a load greater than its output, and the output shaft 4 cannot rotate, but the electric motor 3 is in operation. Therefore, a reaction R1 in the direction opposite to the rotation direction T1 of the electric motor 3 or the output shaft 4 acts on the frame 2 in which the electric motor 3 is mounted. At that time, out of the support structure 8 provided at the end of the frame 2 opposite to the output shaft 4 side, the base member 11, the central shaft 12 and the fixed piece 14 fixed to the mounting portion of the building are immovable. However, as shown in FIG. 9, the rotating member 13 with the frame 2 fitted to the outer peripheral surface elastically deforms the spring member 25 around the central shaft 12 integrally with the frame 2 by the reaction R1 acting on the frame 2. While rotating, one protruding portion 23b of the rotating member 13 contacts the side surface of the bulging portion 14b of the fixed piece 14. Then, a relative rotational displacement between the rotating member 13 and the fixed piece 14 is detected by the detector 26, and the power supply on the power control board 28 of the electric motor 3 is detected based on the detection signal of the detector 26. Since the circuit is interrupted, the operation of the electric motor 3 is automatically stopped.

  Further, as shown in FIG. 10, when the output shaft 4 of the tubular motor A is rotating in the curtain feeding direction T2, the curtain hits the stopper member at the lower limit position or hits the obstacle at the intermediate position. In the tubular motor A, when the electric motor 3 is subjected to a large load exceeding its output due to the spring force acting from the outside and the output shaft 4 cannot rotate, the electric motor 3 operates. Since it remains inside, the reaction R2 in the direction opposite to the rotation direction T2 of the output shaft 4 acts on the frame 2. At that time, as shown in FIG. 11, the rotating member 13 rotates while elastically deforming the spring member 25 around the central shaft 12 integrally with the frame 2 by the reaction R <b> 2 acting on the frame 2. One projecting portion 23 a of 13 comes into contact with the side surface of the bulging portion 14 b of the fixed piece 14. Then, the relative rotational displacement between the rotational member 13 and the fixed piece 14 is detected by the detector 26, and the power supply on the power control board 28 of the electric motor 3 is based on the detection signal of the detector 26. Since the circuit is interrupted, the operation of the electric motor 3 is automatically stopped.

  Therefore, in such an automatic stop device 9 for the tubular motor A, the frame 2 acting when the curtain is stopped causes a rotation displacement between the rotation member 13 and the fixed piece 14, and this rotation is performed. Since the dynamic displacement is detected by the detector 26 and the power supply circuit of the electric motor 3 is cut off, the mechanism is simpler than that using a conventional counter type limit switch while ensuring the reliability of the operation. And the number of parts can be reduced. As a result, even when the diameter of the take-up pipe is as small as less than 5 mm, the automatic stop device 9 itself can be easily reduced in size, and the practicality is excellent.

  In addition, this invention is not limited to the said embodiment, A various other form is included. For example, in the said embodiment, although the large diameter part 11a, the small diameter part 11b, the center shaft 12, and the fixed piece 14 of the base member 11 of the support structure 8 were each comprised by the separate member, this invention may be these depending on the case. You may comprise so that a part or all of may be formed integrally.

  Moreover, in the said embodiment, the detector 26 which detects that the rotation member 13 rotated relatively from the intermediate position with respect to the fixed piece 14 was replaced with the magnet 27 fixed to the fixed piece 14 and the rotation member 13. The detection control board 28 fixed to the pair of protrusions 23a and 23b and the magnet sensing part 29 mounted on the control board 28 so as to oppose the magnet 27 are provided in the present invention. The magnet is configured by fixing the magnet 27 to the rotating member 13 and the magnet sensing unit 29 to the fixed piece 14, or by using another detector of contact type or non-contact type instead of the magnet type. Of course, you may do.

It is a vertical side view of the tubular motor which concerns on embodiment of this invention. It is an enlarged view of the principal part of FIG. It is sectional drawing in the XX line of FIG. It is a perspective view of a support structure. It is a perspective view in the state where a control board for detection was removed from the support structure. It is the arrow view seen from the Y direction of FIG. It is the perspective view seen from the back side of the control board for detection. It is a schematic perspective view for demonstrating the operation | movement at the time of the stop in the upper limit position of a tubular motor. FIG. 7 is a view corresponding to FIG. 6 when stopped at the upper limit position. It is a schematic perspective view for demonstrating the operation | movement at the time of the stop in the lower limit position etc. of a tubular motor. FIG. 7 is a view corresponding to FIG. 6 when stopped at the lower limit position or the like.

Explanation of symbols

A Tubular Motor 1 Winding Pipe 2 Frame 3 Electric Motor 4 Output Shaft 5 Drive Wheel 7 Power Control Board 8 Support Structure 9 Automatic Stop Device 11 Base Member 12 Center Shaft 13 Rotating Member 14 Fixed Pieces 23a, 23b Protrusion 25 Spring Member 26 Detector 27 Permanent magnet 28 Detection control board 29 Magnet sensing unit

Claims (3)

A cylindrical frame arranged concentrically in a winding pipe that winds up curtains such as blinds and sunshades, an electric motor mounted in the frame, and one end connected to the electric motor, In a tubular motor having an output shaft with the other end extending from one end of the frame to the outside of the frame and connected to the winding pipe through the driving wheel and integrally connected to the winding pipe,
A support structure for supporting the frame and rotatably supporting one end of the take-up pipe is provided on the other end side of the frame. The support structure is fixed to the mounting portion of the building and is attached to the outer peripheral surface. A base member that rotatably supports one end of the take-up pipe, a central shaft extending from the base member into the frame along the center line thereof, and rotatably mounted around the central shaft, the frame is mounted on the outer peripheral surface. A rotating member that is fitted so as to rotate integrally, a fixed piece that is fixed to the central shaft so that the rotating member rotates within a predetermined angular range around the central shaft, and the fixed piece and the rotating member A spring member that is constantly biased so that the member faces the intermediate position within the predetermined angle range, and a detector that detects that the rotating member is rotated relative to the fixed piece from the intermediate position. Be prepared The automatic stop device for tubular motor, characterized in that it is configured to cut off the power supply circuit of the electric motor based on a detection signal of the detector.   The rotating member has a pair of projecting portions extending so as to sandwich the fixed piece, and when rotating around the central shaft, each projecting portion comes into contact with the fixed piece to restrict the rotation. 2. The tubular motor automatic stop device according to claim 1, wherein the spring member comprises a wire spring penetrating the central shaft perpendicularly and having both ends sandwiched between a pair of projecting portions of the rotating member.   The detector includes a magnet fixed to the fixed piece, a detection control board fixed to the pair of protrusions of the rotating member, and a magnet sensing part provided on the control board facing the magnet. An automatic stop device for a tubular motor according to claim 2.