Motor for sheet shutter, sheet shutter and heater unit

Abstract

This invention provides a motor for sheet shutters that can reduce the possibility of failure of electronic components inside the motor housing due to temperature differences when the sheet shutter is used in an environment with a large temperature difference between the indoor and outdoor spaces. [Solution] The sheet shutter motor 100 comprises a housing 101 extending from the base end to the tip in the axial direction, a motor shaft 102 provided inside the housing 101 so as to extend in the axial direction and which is rotationally driven, an output shaft 103 directly or indirectly connected to the motor shaft 102 and protruding from the tip of the housing 101, an electronic component 105 arranged in a housing portion 104 which is surrounded by the peripheral wall portion 101a of the housing 101 at the base end side of the motor shaft 102 and which is closed at the base end side, and a heater unit 110 arranged in the housing portion 104 and configured to heat the housing portion 104.

Description

Technical Field

[0001] The present invention relates to a motor for a sheet shutter used to drive a drive shaft for winding up and down a sheet of the sheet shutter, a sheet shutter provided with the motor for the sheet shutter, and a heater unit provided in the motor for the sheet shutter.

Background Art

[0002] Conventionally, a sheet shutter is generally used as a means for partitioning the internal and external spaces through an entrance / exit, which is installed at the entrance / exit of a building. Due to its light weight and flexibility, the sheet shutter is used as a movable partition in various scenarios, especially in an environment where temperature control of a low-temperature space such as a freezer or a refrigerator is required. In the low-temperature space of a freezer or a refrigerator, it is very important to keep the temperature constant, and efficient energy management is required. The sheet shutter is often used to partition such a low-temperature space and a room-temperature space. However, when a conventional sheet shutter is used in a freezer or a refrigerator, dew condensation is likely to occur on the sheet shutter because the temperature difference between the internal and external spaces through the sheet shutter is large. Due to the occurrence of such dew condensation, parts may rust or electric leakage may occur, and the sheet shutter may malfunction, so various countermeasures against dew condensation have been taken.

[0003] For example, Patent Document 1 discloses a sheet shutter with internal condensation countermeasures to address the temperature difference between the interior and exterior spaces. The sheet shutter (100) comprises a sheet (3), a roller assembly (5) for winding up and down the sheet, and a frame (7). The frame (7) consists of left and right rail boxes (9L, 9R), a main body box (11) stretched between the upper ends of each rail box (9), and left and right columns (13). The roller assembly (5) is equipped with a motor and is located inside the main body box (11). The sheet (3) is made of a relatively lightweight and transparent sheet material. The upper edge of the sheet (3) is fixed to the roller assembly (5), and the sheet (3) hangs down between the left and right rail boxes (9). An iron pipe (16) is fixed to the lower edge of the sheet (3) as a reinforcing member extending in the width direction of the sheet. The sheet shutter (100) of Patent Document 1 has the following condensation countermeasures. On one side of the sheet (3), pipes (17) extending in the width direction of the sheet are provided at desired intervals. Both ends of the sheet (3) and pipes (17) in the width direction are inserted into the box body (10) through the opening (24). The ends of the sheet (3) and pipes (17) in the width direction are sealed on the outside of the box by fixed seals (27) and on the inside by movable seals (29). The movable seals (29) move away from the sheet (3) when the sheet (3) is raised or lowered and when it is in the open position. Also, when the sheet (3) is in the closed position, the seals move to come into contact with the sheet (3). At this time, the soft packing (29a) of the movable seals (29) is recessed along the pipes (17) at both ends of the pipes (17), sealing with a minimum gap. In other words, the sheet shutter (100) of Patent Document 1 seals the area around the reinforcing member (16) of the sheet (3) with a movable seal (29) when the sheet (3) is closed, thereby eliminating the gap between the sheet (3) and the slit of the rail box (9), suppressing the outflow of cold air (or warm air), preventing the temperature of the high-temperature side of the rail box (9) from dropping, and thus preventing condensation. [Prior art documents] [Patent Documents]

[0004] Japanese Patent Publication No. 2005-29961 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The sheet shutter described in Patent Document 1 reduces condensation inside the sheet shutter by minimizing the gaps between components, thereby suppressing the intrusion of cold air from the low-temperature space when used in environments with large temperature differences between the internal and external spaces. However, in such operating environments, even if the gap between the sheet shutter and the rail box is sealed, it is unavoidable that the sheet shutter motor, which drives the drive shaft for winding up and down the sheet, will be exposed to cold air. In particular, the sheet shutter motor uses electronic components such as encoders that control the rotation of the drive shaft in order to perform smooth opening and closing of the sheet and precise position control. Such electronic components are housed in a predetermined compartment inside the housing. However, in the structure of conventional sheet shutters, no special measures are taken to prevent condensation in the sheet shutter motor, so condensation occurs inside the housing of the sheet shutter motor, and the electronic components in the housing are prone to failure due to rust, electrical leakage, etc.

[0006] The present invention was made to solve the above problems, and its objective is to provide a sheet shutter motor that can reduce the possibility of failure of electronic components inside the housing due to temperature differences when the sheet shutter is used in an environment with a large temperature difference between the inside and outside space. Furthermore, an objective of the present invention is to provide a sheet shutter equipped with the sheet shutter motor, and a heater unit provided with the sheet shutter motor. [Means for solving the problem]

[0007] (Composition 1) A sheet shutter motor according to one embodiment of the present invention is a sheet shutter motor connected to a drive shaft for winding up and winding down the sheet of the sheet shutter, A housing extending from the base to the tip in the axial direction, A motor shaft is provided inside the housing so as to extend in the axial direction and is rotationally driven, An output shaft is directly or indirectly connected to the motor shaft and protrudes from the front of the housing, An electronic component is placed in a housing that is surrounded by the peripheral wall of the housing at the base end of the motor shaft and has its base end closed. A heater unit is disposed in the aforementioned housing and configured to heat the housing, It is characterized by being equipped with [the following features].

[0008] According to the sheet shutter motor of the present invention, a heater unit is arranged in the housing where electronic components are housed. When the sheet shutter is used in an environment with a large temperature difference between the inside and outside of the space, the housing is heated by the heater unit, thereby suppressing the temperature drop of the housing locally and preferentially. This makes it possible to efficiently prevent condensation from occurring inside the housing. Therefore, the sheet shutter motor of the present invention makes it possible to suppress the occurrence of condensation in the housing of electronic components inside the housing when the sheet shutter is used in an environment with a large temperature difference between the inside and outside of the space, and effectively reduces the possibility of electronic component failure.

[0009] (Configuration 2) A further embodiment of the present invention is a sheet shutter motor of configuration 1, characterized in that the heater unit comprises a sheet heater extending along the inner surface of the peripheral wall portion of the housing. In other words, by using a sheet heater that extends along the inner surface of the peripheral wall of the housing, it is possible to evenly heat the peripheral wall and the electronic component housing from the outer side, thereby more reliably suppressing the occurrence of condensation.

[0010] (Composition 3) A further embodiment of the sheet shutter motor of the present invention is characterized in that, in the sheet shutter motor of configuration 2, the heater unit further comprises a thermostat that controls the sheet heater to turn off when it exceeds a predetermined set temperature and to turn on when it falls below the set temperature. In other words, by controlling the on / off state of the seat heater with a thermostat, the temperature of the storage area can be maintained near a predetermined set temperature without rising too high, thereby more efficiently suppressing condensation.

[0011] (Composition 4) A further embodiment of the present invention is a sheet shutter motor, characterized in that the set temperature is 16 to 30°C, in the sheet shutter motor of configuration 3. In other words, it is possible to maintain the temperature of the storage area at or near room temperature based on the set temperature.

[0012] (Composition 5) A further embodiment of the present invention is a sheet shutter motor in the sheet shutter motor of configuration 3, wherein the electronic component is an encoder for measuring the amount of rotation of the motor shaft and for feedback control of the operation of the drive shaft based on the measured amount of rotation. The housing surrounding the accommodating portion has a substantially cylindrical peripheral wall, and the encoder is positioned at the radial center of the peripheral wall. In other words, the encoder can control the rotation of the drive shaft to enable smooth opening and closing of the seat and precise position control. Furthermore, because the distance between the seat heater and the encoder is nearly constant, partial heating of the encoder can be suppressed.

[0013] (Composition 6) A further embodiment of the present invention is a sheet shutter motor according to configuration 3, characterized in that the housing is provided with a partition wall that separates the housing portion from the space on the motor shaft side. In other words, the housing is a space in which the base end is closed, the tip end is closed by a partition wall, and the surrounding area is enclosed in the circumferential direction by a peripheral wall, thus enabling efficient heating by the heater unit.

[0014] (Composition 7) A further embodiment of the present invention is a sheet shutter motor according to any of configurations 1 to 6, wherein the housing is provided with an opening that faces the outside on the axial base end side, The heater unit is configured to be detachably attached to the base end side of the housing through the opening, The aforementioned heater unit is A cylindrical wall portion that extends in the axial direction and extends along the inner surface of the peripheral wall of the housing when inserted into the housing portion, The system further comprises a closing wall portion formed at the axial end of the cylindrical wall portion and extending to close the base end of the cylindrical wall portion and the opening, The seat heater is fixed to the inner surface of the cylindrical wall portion. In other words, a separate heater unit can be easily introduced to a sheet shutter motor that has an opening on the base end. As a result, condensation countermeasures for the sheet shutter motor can be implemented simply and economically.

[0015] (Composition 8) A further embodiment of the present invention is a sheet shutter motor of configuration 7, wherein the base end of the housing is provided with a flange portion that protrudes radially outward from the peripheral wall portion, The closed wall portion of the heater unit is provided with an extension portion that extends radially outward from the cylindrical wall portion. The heater unit is fixed to the housing via fixing portions provided on the flange portion and the extension portion, respectively. In other words, the flange portion protruding from the base end of the housing and the extended portion of the heater unit can be aligned, and the heater unit can be easily fixed to the housing via two fixing parts.

[0016] (Configuration 9) The sheet shutter according to one embodiment of the present invention is a sheet shutter for opening and closing an entrance connecting a room temperature space and a low temperature space, a sheet that extends so as to be able to block the entrance, a drive shaft connected to the sheet for winding up and winding down the sheet, a heater for a sheet shutter according to any one of Configurations 1 to 6, which is connected to an end of the drive shaft and controls the rotation of the drive shaft, and is characterized by comprising the above.

[0017] According to the sheet shutter of the present invention, it is possible to exhibit the effects of the motor for a sheet shutter according to any one of Configurations 1 to 6 as a sheet shutter. Therefore, when the sheet shutter of the present invention is used in an environment where the temperature difference between the inside and outside spaces is large, it is possible to suppress the occurrence of dew condensation in the accommodation part of the electronic components inside the housing of the motor for a sheet shutter, and reduce the possibility of the electronic components malfunctioning.

[0018] (Configuration 10) A heater unit according to one embodiment of the present invention is a heater unit configured to be detachable from a motor for a sheet shutter connected to a drive shaft for winding up and winding down the sheet of the sheet shutter, where the motor for the sheet shutter, has a housing extending from the proximal end to the distal end in the axial direction, a motor shaft provided inside the housing so as to extend in the axial direction and rotationally driven, an output shaft directly or indirectly connected to the motor shaft and protruding from the distal end of the housing, and electronic components arranged in a housing part surrounded by the peripheral wall part of the housing on the proximal end side of the motor shaft, and comprises, an opening is provided in the housing so as to expose the housing part to the outside on the proximal end side in the axial direction, and the heater unit, A cylindrical wall portion that extends in the axial direction and extends along the inner surface of the peripheral wall of the housing when inserted into the housing portion, A closing wall portion is formed at the axial end of the cylindrical wall portion and extends to close the base end of the cylindrical wall portion and the opening, A sheet heater fixed to the inner surface of the cylindrical wall portion and configured to heat the housing portion, The system is characterized by comprising a thermostat that controls the seat heater to turn off when the temperature exceeds a predetermined set temperature and to turn on when the temperature falls below the set temperature.

[0019] According to the heater unit of the present invention, by attaching a separate heater unit to a sheet shutter motor having an opening at its base end, the heater unit is positioned in the housing where electronic components are housed. When the sheet shutter, with the heater unit attached to the sheet shutter motor, is used in an environment with a large temperature difference between the inside and outside, the housing is heated by the sheet heater of the heater unit, thereby suppressing the temperature drop of the housing locally and preferentially. This makes it possible to efficiently prevent condensation from occurring inside the housing. Furthermore, by using a sheet heater that extends along the inner surface of the peripheral wall of the housing, it is possible to heat the housing of electronic components evenly from the outer side, along with the peripheral wall. In addition, by controlling the on / off state of the sheet heater with a thermostat, the temperature of the housing can be maintained near a predetermined set temperature without rising too high. Therefore, the heater unit of the present invention makes it possible to suppress the occurrence of condensation in the housing of electronic components inside the housing when the sheet shutter is used in an environment with a large temperature difference between the inside and outside, thereby reducing the possibility of electronic component failure. Furthermore, it is also possible to implement condensation countermeasures simply and economically for sheet shutter motors that have an opening on the base end side. [Effects of the Invention]

[0020] The motor for a sheet shutter of the present invention can reduce the possibility of failure of electronic components inside the housing due to temperature differences when the sheet shutter is used in an environment with a large temperature difference between the inside and outside of the space. [Brief explanation of the drawing]

[0021] [Figure 1] A schematic front view showing a cross-sectional view of a part of the sheet shutter motor of one embodiment of the present invention. [Figure 2] Figure 1 shows a magnified view of the motor for the sheet shutter. [Figure 3] Figure 1 is a side view of the sheet shutter motor, seen from the base end. [Figure 4] Exploded view of the sheet shutter motor in one embodiment of the present invention. [Figure 5] A schematic diagram showing a sheet shutter equipped with a sheet shutter motor according to one embodiment of the present invention. [Modes for carrying out the invention]

[0022] One embodiment of the present invention will be described below with reference to the drawings. Note that the shapes in the drawings referenced in the following description are conceptual or schematic diagrams for illustrating preferred shapes, and the dimensional ratios, etc., do not necessarily correspond to actual dimensional ratios. In other words, the present invention is not limited to the dimensional ratios shown in the drawings.

[0023] A sheet shutter motor 100 of one embodiment of the present invention is installed at an entrance to the interior and exterior space of a building and is used to drive a sheet shutter 10 for partitioning the entrance so that it can be opened and closed. More specifically, as shown in Figure 5, the sheet shutter 10 generally comprises a sheet 11 for opening and closing the entrance, a sheet case 12 that houses the rolled sheet 11, a drive shaft 13 for winding up and down the sheet 11, and a sheet rail 14 that guides the movement of the sheet 11 in the opening and closing direction. The sheet shutter motor 100 is connected to at least one end of the drive shaft 13 in order to electrically wind up and down the sheet 11. In this embodiment, as shown in Figure 5, the drive shaft 13 is a hollow cylindrical core (in which the sheet 11 is wound into a roll) or winding shaft, and the output shaft 103 of the sheet shutter motor 100 is connected to the drive shaft 13 with the motor positioned inside the hollow end of the drive shaft 13. In other words, the sheet shutter motor 100 is configured to rotate the drive shaft 13 in the winding direction (forward direction) and the winding direction (reverse direction). The sheet shutter motor 100 may be connected to a control unit (not shown) that controls the overall operation of the sheet shutter 10. In this case, the sheet shutter 10 is provided with an operation panel 16, and the user can operate the sheet shutter 10 through the operation panel 16. Needless to say, the sheet shutter motor of the present invention may also be used in products similar to sheet shutters or other applications.

[0024] Furthermore, the sheet shutter 10 of this embodiment is intended for use in opening and closing an entrance that connects a room temperature space and a low temperature space. For example, the low temperature space is the internal space of a freezer, refrigerator, or low-temperature warehouse, and the room temperature space is the external space at room temperature connected via the entrance. The sheet shutter 10 is installed at the entrance to block out cold air or heat. In such an installation environment, the sheet shutter 10 will be exposed to the temperature difference between the low temperature space and the room temperature space, and condensation will become a problem. The sheet shutter motor 100 of this embodiment is provided in the sheet shutter 10 to deal with such a temperature difference.

[0025] Referring to Figures 1 to 3, the configuration of a sheet shutter motor 100 according to one embodiment of the present invention will be described. Figure 1 is a schematic front view showing a part of the sheet shutter motor 100 in cross-section. Figure 2 is a partially enlarged view of Figure 1. Figure 3 is a side view of the sheet shutter motor 100 as seen from the base end.

[0026] As shown in Figure 1, the sheet shutter motor 100 comprises a housing 101 extending from the base end to the tip in the axial direction, a motor shaft 102 provided inside the housing 101 so as to extend in the axial direction and which is rotationally driven, an output shaft 103 directly or indirectly connected to the motor shaft 102 and protruding from the tip of the housing 101, one or more electronic components arranged in the housing 104 for controlling the motor operation, and a heater unit 110 arranged in the housing 104 and configured to heat the housing 104.

[0027] The sheet shutter motor 100 is powered by an external power source (which may be a battery) via a power cable 109, which rotates the motor shaft 102. The rotation direction and amount of the motor shaft 102 can also be controlled by the electronic components and / or control unit of the sheet shutter motor 100. Although not shown, the motor shaft 102 may be connected to the output shaft 103 via a reduction mechanism or the like. Alternatively, the motor shaft 102 and the output shaft 103 may be integrally formed.

[0028] As shown in Figures 2 and 3, the base end of the motor shaft 102 inside the housing 101 is located in a housing 104 that is surrounded by the peripheral wall 101a of the housing 101 and has its base end closed. The peripheral wall 101a has a substantially cylindrical shape and has a substantially circular inner surface in a cross-sectional view perpendicular to the axial direction. The housing 101 is also provided with a partition wall 108 that separates the housing 104 from the space on the motor shaft 102 side. The partition wall 108 has a circular hole in the center through which the base end of the motor shaft 102 can pass. The base end of the housing 104 is closed by a closing wall 112. As shown in Figure 3, the closing wall 112 is provided with a notch 112a for routing cables (power cable 109, encoder cable 105a, heater lead wire 119) to the outside. A bush 112b is attached between the notch 112a and the cables. In other words, the housing section 104 is a housing space defined by a circular peripheral wall 101a extending in the circumferential direction, a closing wall 112 at the base end, and a partition wall 108 at the tip end. An encoder 105, which is one of the electronic components, and a heater unit 110 are arranged in this housing section 104.

[0029] The encoder 105 is an electronic component that measures the amount of rotation of the motor shaft 102 and provides feedback control to the operation of the drive shaft 13 of the sheet shutter 10 based on the measured amount of rotation. The encoder 105 is located at the radial center of the peripheral wall portion 101a. The base end of the motor shaft 102 is connected to the encoder 105, and information such as the amount of rotation, speed, rotational position, and torque of the motor shaft 102 can be obtained. The encoder 105 is also configured to transmit an encoder signal containing feedback information to the control unit via the encoder cable 105a. This encoder 105 makes it possible to control the rotation of the drive shaft 13 to enable smooth opening and closing and precise position control of the sheet 11 of the sheet shutter 10.

[0030] The heater unit 110 is provided to locally heat the housing 104 in order to prevent condensation inside the housing 104. The heater unit 110 includes a sheet heater 113 that extends along the inner surface of the peripheral wall portion 101a of the housing 101. That is, the sheet heater 113 extends in an arc shape in a cross section perpendicular to the axial direction in at least a portion of the circumferential direction of the inner surface of the peripheral wall portion 101a. In this embodiment, the sheet heater 113 is a silicone rubber heater and can generate heat by the current supplied from the heater lead wire 119. The heat generated by this circumferentially extending sheet heater 113 makes it possible to evenly heat the housing 104 from the outer periphery side together with the peripheral wall portion 101a. Here, since the distance between the sheet heater 113 and the encoder 105 is substantially constant, it is possible to suppress the partial heating of the encoder 105, which can cause malfunctions or failures.

[0031] Furthermore, the heater unit 110 includes a thermostat 115 that controls the seat heater 113 to turn off when it exceeds a predetermined set temperature and to turn on when it falls below the set temperature. The thermostat 115 is electrically connected to the seat heater 113 via heater lead wires 119. By controlling the on / off state of the seat heater 113 with this thermostat 115, the temperature of the housing 104 can be maintained near a predetermined set temperature without rising too high. This set temperature is preferably 16 to 30°C to maintain the temperature of the housing 104 near room temperature. This thermostat 115 is fixed to the closing wall portion 112. Here, since the housing 104 is a space in which its base end is closed off by the closing wall portion 112, its front end is closed off by the partition wall portion 108, and it is surrounded in the circumferential direction by the peripheral wall portion 101a, efficient heating by the heater unit 110 is possible.

[0032] In other words, in one embodiment of the sheet shutter motor 100, when the sheet shutter 10 is used in an environment with a large temperature difference between the inside and outside of the room, the housing section 104 is heated (or heated) by the heater unit 110, thereby locally and preferentially suppressing the temperature drop of the housing section 104. This makes it possible to suppress rapid temperature changes in the housing section 104 and efficiently prevent condensation from occurring inside the housing section 104. As a result, the possibility of failure of electronic components such as the encoder 105 can be reduced.

[0033] Furthermore, in the sheet shutter motor 100 of this embodiment, the heater unit 110 is configured to be detachably attached to the sheet shutter motor 100. Figure 4 is an exploded view of the sheet shutter motor 100. As shown in Figure 4, the heater unit 110 is a separate unit, separated from the motor unit 100a of the sheet shutter motor 100. Here, the motor unit 100a is the main motor part that functions as a motor on its own, and includes major components such as the housing 101, motor shaft 102, output shaft 103 and electronic components (encoder 105, etc.), but does not include the heater unit 110.

[0034] As shown in Figure 4, the base end of the housing 101 is provided with an opening 106 that faces outwards towards the axial base end of the housing 104. The base end of the housing is also provided with a flange portion 107 that protrudes radially outwards from the peripheral wall portion 101a. Multiple (four) fixing holes 107a are drilled in the flange portion 107.

[0035] On the other hand, the heater unit 110 includes a cylindrical wall portion 111 that extends in the axial direction and extends along the inner surface of the peripheral wall portion 101a of the housing 101 when inserted into the housing portion 104, a closing wall portion 112 formed at the axial end of the cylindrical wall portion 111 and extending to close the base end of the cylindrical wall portion 111 and the opening 106, a seat heater 113 fixed to the inner surface of the cylindrical wall portion 111 and configured to heat the housing portion 104, and a thermostat 115 that controls the seat heater 113 to turn off when it exceeds a predetermined set temperature and to turn it on when it falls below the set temperature.

[0036] The cylindrical wall portion 111 is configured such that its outer circumferential surface abuts or slides against the inner surface of the peripheral wall portion 101a. The closing wall portion 112 has a disc shape with a diameter larger than the diameter of the opening 114. The closing wall portion 112 is provided with a plurality of extension portions 117 that extend radially outward from the cylindrical wall portion 111. In this embodiment, a pair of extension portions 117 extend radially in opposite directions. Each extension portion 117 has a fixing groove 117a formed therein. That is, the heater unit 110 is fixed to the housing 101 via fixing holes (fixing holes 107a and fixing grooves 117a) provided in the flange portion 107 and the extension portions 117, respectively (see Figure 3). The seat heater 113 is attached to the cylindrical wall portion 111 by double-sided tape or adhesive in a state where it is curved and deformed in an arc shape along the inner circumferential surface. The thermostat 115 is then secured to the inner surface of the closure wall 112 by a cable tie.

[0037] In the sheet shutter motor 100 of this embodiment, as shown in Figure 4, the heater unit 110 can be easily attached to the motor unit 100a by inserting the cylindrical wall portion 111 of the separate heater unit 110 into the opening 106 on the base end side of the housing 101 of the motor unit 100a, and fixing it with bolts by aligning the fixing holes 107a and fixing grooves 117a. In other words, the heater unit 110 can be easily retrofitted to the existing motor unit 100a. Therefore, by using the heater unit 110 of this embodiment, users can easily and economically implement condensation countermeasures for the sheet shutter motor 100.

[0038] Therefore, the sheet shutter motor 100 of this embodiment can reduce the possibility of failure of electronic components inside the housing 101 due to temperature differences when the sheet shutter 10 is used in an environment with a large temperature difference between the inside and outside space.

[0039] The present invention is not limited to the embodiments described above, and various embodiments and modifications are possible. Modifications of the present invention will be described below.

[0040] (1) The motor for the sheet shutter of the present invention is not limited to the configuration of the above embodiment. In the above embodiment, a separate heater unit is mounted on the motor unit, but the present invention is not limited thereto. For example, the heater unit may include a sheet heater, a wire heater, or ceramic heaters scattered in the circumferential direction, which are directly fixed to the inner surface of the peripheral wall of the housing without having a cylindrical wall portion.

[0041] (2) The motor for the sheet shutter of the present invention is not limited to the configuration of the above embodiment. In the above embodiment, the electronic component was exemplified as an encoder, but the present invention is not limited thereto. The electronic component may be a sensor, a microcontroller, various circuits, etc.

[0042] The present invention is not limited to the embodiments or modifications described above, and can be implemented in various forms as long as they fall within the technical scope of the present invention. That is, within the technical scope of the present invention, some of the configurations of this embodiment may be omitted or modified, or other configurations may be added. [Explanation of Symbols]

[0043] 10-sheet shutter 11 sheets 12-seat case 13 Drive shaft 14 seat rails 16 Control panel 100-sheet shutter motor 100A Motor Unit 101 Housing 101a Peripheral wall part 102 Motor shaft 103 Output shaft 104 Storage Unit 105 encoder 105a encoder cable 106 Opening 107 Flange section 107a Fixing hole (fixing part) 108 Bulkhead 109 Power Cable 110 Heater Unit 111 Cylinder wall 112 Blocking wall 112a Notch 112b Bush 113 Seat heater 115 Thermostat 117 Extension 117a Fixing groove (fixing part) 119 Heater lead wire

Claims

1. A sheet shutter motor connected to a drive shaft for winding up and winding down the sheet shutter, A housing extending from the base to the tip in the axial direction, A motor shaft is provided inside the housing so as to extend in the axial direction and is rotationally driven, An output shaft is directly or indirectly connected to the motor shaft and protrudes from the front of the housing, An electronic component is placed in a housing that is surrounded by the peripheral wall of the housing at the base end of the motor shaft and has its base end closed. A heater unit is disposed in the aforementioned housing and configured to heat the housing, A motor for a sheet shutter, characterized by having the following features.

2. The motor for a sheet shutter according to claim 1, characterized in that the heater unit comprises a sheet heater extending along the inner surface of the peripheral wall portion of the housing.

3. The heater for a sheet shutter according to claim 2, further comprising a thermostat that controls the heater unit to turn off the sheet heater when it exceeds a predetermined set temperature and to turn on the sheet heater when it falls below the set temperature.

4. The heater for a sheet shutter according to claim 3, characterized in that the set temperature is 16 to 30°C.

5. The aforementioned electronic component is an encoder for measuring the amount of rotation of the motor shaft and for feedback control of the operation of the drive shaft based on the measured amount of rotation. The heater for a sheet shutter according to claim 3, characterized in that the peripheral wall portion of the housing surrounding the accommodating portion is substantially cylindrical in shape, and the encoder is positioned at the radial center of the peripheral wall portion.

6. The heater for a sheet shutter according to claim 3, characterized in that the housing is provided with a partition wall that separates the housing portion from the space on the motor shaft side.

7. The housing is provided with an opening that faces the outside on the axial base end side of the housing portion. The heater unit is configured to be detachably attached to the base end side of the housing through the opening, The aforementioned heater unit is A cylindrical wall portion that extends in the axial direction and extends along the inner surface of the peripheral wall of the housing when inserted into the housing portion, The system further comprises a closing wall portion formed at the axial end of the cylindrical wall portion and extending to close the base end of the cylindrical wall portion and the opening, The sheet shutter heater according to any one of claims 1 to 6, characterized in that the sheet heater is fixed to the inner surface of the cylindrical wall portion.

8. The base end of the housing is provided with a flange portion that protrudes radially outward from the peripheral wall portion. The closed wall portion of the heater unit is provided with an extension portion that extends radially outward from the cylindrical wall portion. The heater for a sheet shutter according to claim 7, characterized in that the heater unit is fixed to the housing via fixing portions provided on the flange portion and the extension portion, respectively.

9. A sheet shutter for opening and closing an entrance / exit that connects a room temperature space and a low temperature space, A sheet extending so as to be able to close the aforementioned entrance, A drive shaft connected to the sheet for winding up and winding down the sheet, A sheet shutter heater according to any one of claims 1 to 6, connected to the end of the drive shaft and for controlling the rotation of the drive shaft, A sheet shutter characterized by having the following features.

10. A heater unit configured to be detachably attached to a sheet shutter motor connected to a drive shaft for winding up and winding down the sheet shutter, The aforementioned motor for the sheet shutter is A housing extending from the base to the tip in the axial direction, A motor shaft is provided inside the housing so as to extend in the axial direction and is rotationally driven, An output shaft is directly or indirectly connected to the motor shaft and protrudes from the front of the housing, The motor shaft comprises an electronic component located in a housing surrounded by the peripheral wall of the housing at the base end side, The housing is provided with an opening that faces the outside on the axial base end side of the housing portion. The aforementioned heater unit is A cylindrical wall portion that extends in the axial direction and extends along the inner surface of the peripheral wall of the housing when inserted into the housing portion, A closing wall portion is formed at the axial end of the cylindrical wall portion and extends to close the base end of the cylindrical wall portion and the opening, A sheet heater fixed to the inner surface of the cylindrical wall portion and configured to heat the housing portion, A heater unit characterized by comprising a thermostat that controls the seat heater to turn off when it exceeds a predetermined set temperature and to turn on when it falls below the set temperature.

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