JP2023027387A - Shielding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shielding device with improved lifting or lowering performance of a shielding material, when the shielding material is lifted/lowered by a driving force of a motor using a lifting/lowering cord.

SOLUTION: The shielding device comprises: a winding drum 51U or 51L that winds or rewinds a lifting/lowering cord 3U or 3L for lifting/lowering the shielding material, by lifting/lowering a rail (an intermediate rail 7U or a bottom rail 7L) provided on a bottom edge of the shielding member (an upper screen 6U or a lower screen 6L); and a support member (a shaft case 50, a shaft cover 53, and a cord outlet member 54 that rotatably supports pulleys 55, 56). The support member has a function that sequentially winds the lifting/lowering cord when the lifting/lowering cord is wound by the winding drum 51U or 51L (a tip part 53f of a protrusion part 53e formed on the shaft cover 53).

SELECTED DRAWING: Figure 12

COPYRIGHT: (C)2023,JPO&INPIT

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielding device capable of raising and lowering a shielding material.

Among the shielding devices that can raise and lower the shielding material, the electric shielding device typically rotates the drive shaft with the driving force of a motor and winds a lifting cord (including a cord-like cord or a tape-like lifting tape). The shielding material can be moved up and down by winding or unwinding it with the take-up drum.

In such an electric shielding device, a motor is provided in the headbox, rotation of the output shaft of the motor is transmitted to the drive shaft, and the shielding material is raised and lowered based on the rotation of the drive shaft.

In addition, an encoder for detecting the rotation speed and amount of rotation of the drive shaft is arranged in the head box of the electric shielding device, and based on the pulse signal output from the encoder, the speed of the encoder pulse and the number of pulses are counted. Managing values, the speed and amount of rotation of the motor are controlled by a controller located in the headbox. By such an operation, the speed of raising and lowering the shielding material is appropriately adjusted, and the stop position of the raised and lowered shielding material is controlled.

On the other hand, in the manual shielding device, each winding drum for winding or rewinding the lifting cords for lifting and lowering the upper shielding material and the lower shielding material, which are arranged in a vertical direction, is provided as a manually-operated winding unit. It is known to configure a support member for rotatable support (see Patent Documents 1 and 2, for example).

In the manual shielding device disclosed in Patent Document 1, a support member that rotatably supports a winding shaft (that is, a winding drum) for winding or unwinding the lifting cord has an insertion hole and a lifting cord. A winding unit is provided with a slit-shaped guide portion for preventing disorderly winding. It is designed to guide you towards.

Further, in the manual shielding device disclosed in Patent Document 2, the base end of the winding drum is attached to the shaft case (that is, the support member) of the winding unit that rotatably supports the winding shaft (that is, the winding drum). In particular, the shaft cover disclosed in Patent Document 2 is a brake that prevents the rail provided at the lower end of the shield from falling due to its own weight by providing resistance to the movement of the lifting cord. It functions as a mechanism. Incidentally, below the shaft case disclosed in Patent Document 2, there is shown an example in which a pulley for guiding the hanging of the lifting cord for the upper shielding material from the winding drum is provided above the insertion hole. are parallel to the axial direction of the winding drum.

Patent No. 6282064 JP 2019-85851 A

As described above, the electric shielding device typically rotates the drive shaft with the driving force of the motor, and winds or unwinds the lifting cord with the winding drum, thereby raising and lowering the shielding material. there is

In the electric shielding device, it is theoretically possible to divert the winding unit having a shaft case that rotatably supports each winding drum to a manual dedicated winding unit.

However, in the electric shielding device, the raising and lowering speed of the shielding material is generally kept lower than in the case of the manual shielding device. This is because the electric shielding device may handle shielding materials that would increase the operation load in the manual type, and consideration is given to the reduction of the motor load and the safety of the operation.

For this reason, in the electric shielding device, various problems arise when a manual dedicated winding unit is diverted.

For example, if the manual-only winding unit disclosed in Patent Document 1 is applied to an electric shielding device, it is difficult to guide the lifting cord for the upper shielding material to the winding drum near the lower limit of the upper shielding material's elevation. The load component on the barrier to prevent random winding in the slit-shaped guide part became too large to be ignored in the low-speed descending operation, and the upper shielding material could not be lowered sufficiently to the lower limit position of the vertical movement, and the lowering performance of the upper shielding material was affected. Problems can arise.

Further, when the manual-only winding unit disclosed in Patent Document 2 is applied to the electric shielding device, it is difficult to guide the lifting cord for the lower shielding material to the winding drum near the lower limit of the lifting/lowering of the lower shielding material. The load component of the shaft cover (or pulley) becomes so large that it cannot be ignored for low-speed descent, and the lower shielding material cannot be sufficiently lowered to the lower limit position with a margin, causing a problem in the descent performance of the lower shielding material. There is

Further, when the manual dedicated winding unit disclosed in Patent Documents 1 and 2 is applied to the electric shielding device, when the upper shielding material and the lower shielding material are driven to rise at low speed, each lifting cord by each winding drum The cord is less likely to slip during winding, and the upper shielding material and the lower shielding material each rise jerkily, causing a jerking phenomenon, which may cause a problem in rising performance.

Incidentally, the above-mentioned problem is not limited to the electric shielding device that raises and lowers each of the plurality of shielding materials arranged in a row in the vertical direction, but also the electric shielding device that raises and lowers each of the plurality of shielding members arranged in front and behind. Alternatively, a similar problem arises with an electric shielding device that raises and lowers a single shielding material.

For this reason, there is a demand for a winding unit that improves the performance of winding or unwinding the lifting cords when the shielding members are lifted or lowered. Further, there is a demand for a winding unit that can be applied to a shielding device that manually raises and lowers a shielding material, and for a technique that improves the climbing performance or descending performance.

SUMMARY OF THE INVENTION Therefore, in view of the above problems, an object of the present invention is to raise and lower a shielding material with improved raising or lowering performance of the shielding material when the shielding material can be raised and lowered by the driving force of a motor using a lifting cord. To provide a shielding device that enables

A shielding device according to the present invention is a shielding device that allows a shielding material to be raised and lowered, and a lifting cord for raising and lowering the shielding material by raising and lowering a rail provided at the lower end of the shielding material is wound or unwound. A take-up drum and a support member for rotatably supporting the take-up drum are provided, and the support member has a function of sequentially pushing and winding the lift cord when the lift cord is wound by the take-up drum. It is characterized by

Further, in the shielding device according to the present invention, the support member has a shaft cover provided on the base end side of the winding drum at which winding of the lifting cord is started, and the support member is provided on the winding drum. and a projection having a function of sequentially pushing and winding the lifting cord when the lifting cord is wound by the shaft cover, wherein the projection is provided on the shaft cover.

Further, in the shielding device according to the present invention, the protrusion has a curved surface that is curved so as to maintain a gap smaller than the cord diameter of the lifting cord with respect to the base end, and the tip of the protrusion is , is characterized by having elasticity that assists the function of pushing and winding.

According to the present invention, it is possible to improve the raising performance or lowering performance of the shielding material in the shielding device in which the shielding material can be raised and lowered by the driving force of the motor using the lifting cord.

(a) to (c) are a plan view, a front view and a side view, respectively, showing a schematic configuration of an electric shielding device according to one embodiment of the present invention. 1 is a block diagram showing a schematic configuration of a control device in an electric shielding device of one embodiment according to the present invention; FIG. 1 is a perspective view showing a schematic configuration of a winding unit of one embodiment according to the present invention; FIG. 1 is an exploded perspective view showing a schematic configuration of a winding unit of one embodiment according to the present invention; FIG. 4(a) and 4(b) are plan views showing how pulleys of the cord exit member in the winding unit of the embodiment according to the present invention can be changed. FIG. 1 is a partially sectional front view showing a schematic configuration of a winding unit according to an embodiment of the present invention; FIG. 1(a) is a partially cross-sectional side view showing a schematic configuration of a winding unit according to an embodiment of the present invention, and FIG. 1(b) is a simplified diagram thereof. (a) is a simplified plan view showing the operation related to the lowering performance of the winding unit of the comparative example based on the prior art, and (b) is the operation related to the lowering performance of the winding unit of the embodiment according to the present invention. 1 is a simplified plan view showing FIG. (a) is a partially cross-sectional side view showing the schematic configuration of a modified winding unit according to the present invention, and (b) is a cord exit member in the modified winding unit according to the present invention. FIG. 11 is a plan view showing how pulleys can be rearranged; 4(a) and 4(b) are plan views showing how the shaft cover of the winding unit of the embodiment according to the present invention can be rearranged. FIG. 3(a) and 3(b) respectively show a line contact time and a point when the lifting cord is wound up by the protrusion of the shaft cover of the embodiment of the winding unit of the embodiment of the present invention. FIG. 4 is a plan view showing a state of contact; (a) is a simplified plan view showing the operation related to the lifting performance of the winding unit of the comparative example based on the prior art, and (b) is the operation related to the lifting performance of the winding unit of the embodiment according to the present invention. 1 is a simplified plan view showing FIG. (a) and (b) respectively show a shape of a modified shaft cover in a winding unit according to an embodiment of the present invention, and push winding related to winding of the lifting cord by the projection of the modified shaft cover. is a plan view showing the state when performing.

An electric shielding device according to an embodiment of the present invention will be described below with reference to the drawings. In the specification of the present application, with respect to the front view of the electric shielding device shown in FIG. The left direction is defined as the left side of the electric shielding device, and the right direction in the drawing is defined as the right side of the electric shielding device. In addition, in the examples described below, with respect to the front view of the electric shielding device shown in FIG. .

(overall structure)
1(a) to 1(c) are a plan view (downward view), a front view and a side view, respectively, showing a schematic configuration of an electric shielding device according to one embodiment of the present invention. As a typical example of the electric shielding device shown in FIG. 1, an electric pleated screen is shown in which a plurality of shielding members are arranged in a row vertically and each can be raised and lowered. However, it is not necessary to be limited to this as long as each of the single or multiple shielding materials can be electrically moved up and down using a string-like lifting cord. A screen, a horizontal blind, a tuck-up curtain, or the like, or an electric shielding device having a hybrid structure in which these different kinds of shielding materials are arranged vertically or in the front-to-rear direction may be combined.

In the electric pleated screen of one embodiment shown in FIGS. 1(a) to (c), an upper screen 6U that can be bent in a zigzag shape is suspended from the lower surface of the head box 1, and the lower end of the upper screen 6U is It is attached to the upper surface of the intermediate rail 7U which functions as a weight member. The headbox 1 is fixed via a bracket 15 to a mounting surface such as a ceiling surface.

The upper screen 6U of this example has, as shown in FIG. Penetration holes formed of holes or the like are provided, respectively, and the lifting cords 3U and 3L suspended from the head box 1 are inserted through the insertion holes. For this reason, the lifting cords 3U and 3L hang down on the back side of the upper screen 6U so that they cannot be visually recognized from the front as shown in FIG. However, regarding the present invention, an insertion hole may be provided in the front-rear direction substantially central portion of the upper screen 6U so that the lifting cords 3U and 3L inserted through the insertion hole can be visually recognized from the front view. Further, as shown in FIG. 1(c), behind the lifting cords 3U and 3L, a pitch holding cord 4U hangs down from the head box 1 and its lower end is attached to the intermediate rail 7U. A large number of annular support cords 40 are provided on the pitch holding cord 4U at equal intervals, and the lifting cords 3U and 3L are inserted through the support cords 40. As shown in FIG. When the intermediate rail 7U is lowered to extend the upper screen 6U, the projecting pieces 60 are supported by the support cords 40 of the pitch holding cords 4U so that the folds of the upper screen 6U are held at substantially equal intervals. It's becoming

A lower screen 6L that can be bent in a zigzag shape is suspended from the lower surface of the intermediate rail 7U, and the lower end of the screen 6L is attached to the upper surface of the bottom rail 7L that functions as a weight member.

Similarly to the upper screen 6U, the lower screen 6L of the present embodiment is also provided with a projecting piece 60 at the position of the fold of the zigzag-folded fabric on the outdoor side, as shown in FIG. Each 60 is provided with an insertion hole formed as a round hole or an elongated hole, and an elevating cord 3L suspended from the head box 1 and penetrating the intermediate rail 7U is inserted through the insertion hole. For this reason, the lifting cord 3L hangs down on the back side of the lower screen 6L so that it cannot be visually recognized when viewed from the front as shown in FIG. However, in regard to the present invention, an insertion hole may be provided in the substantially central portion of the lower screen 6L in the front-rear direction so that the lifting cord 3L inserted through the insertion hole can be visually recognized from the front view. Further, as shown in FIG. 1(c), behind the lifting cord 3L, a pitch holding cord 4L hangs down from the head box 1, and its lower end is attached to the bottom rail 7L. A large number of annular support cords 40 are provided at regular intervals on the pitch holding cord 4L, and the lifting cord 3L is inserted through the support cords 40. As shown in FIG. When the bottom rail 7L is lowered to extend the lower screen 6L, the protruding pieces 60 are supported by the support cords 40 of the pitch holding cords 4L so that the folds of the lower screen 6L are held at substantially equal intervals. It's becoming

Winding drums 51U and 51L are arranged side by side in the front-rear direction and rotatably supported in the respective winding units 5 disposed at proper positions (two positions on the left and right in this example) in the head box 1 .

The upper ends of the string-like lifting cords 3U are attached to the respective winding drums 51U so as to be wound up or rewound. It passes through an insertion hole formed in 60 and is attached to intermediate rail 7U. The winding drum 51U is formed such that its diameter gradually decreases toward one side in the axial direction, and the string-like lifting cord 3U is spirally wound sequentially around the winding drum 51U.

Further, the upper ends of the string-like lifting cords 3L are attached to the winding drums 51L so as to be able to be wound or rewound, and the lower ends of the lifting cords 3L are attached to the upper screens 6U. It penetrates the insertion holes formed in the projecting pieces 60, further penetrates the intermediate rail 7U, penetrates the insertion holes formed in the projecting pieces 60 provided on the outdoor side of the lower screen 6L, and the bottom rail 7L. attached to. The winding drum 51L is formed so that the diameter gradually becomes smaller toward one side in the axial direction, and the string-like lifting cord 3L is spirally wound around the winding drum 51L sequentially.

A drive shaft 2U is inserted through the center shaft of each winding drum 51U, and the rotation of the drive shaft 2U is transmitted to the winding drum 51U.

Similarly, the drive shaft 2L is inserted through the center shaft of each winding drum 51L, and the rotation of the drive shaft 2L is transmitted to the winding drum 51L.

In particular, although the details will be described later, the winding unit 5 of the present embodiment covers the base end sides of the winding drums 51U and 51L, and performs forced winding related to winding of the lifting cords 3U and 3L. A shaft cover 53 that suppresses the jerking phenomenon and improves the rising performance of the upper screen 6U and the lower screen 6L, respectively, guides the lifting cords 3U and 3L to the outside, and at least the lifting cords 3U and 3L pulleys 55, 56 which are arranged at a predetermined inclination angle to reduce the delivery load with respect to the axial direction of the winding drums 51U, 51L, and which improve the lowering performance of the upper screen 6U and the lower screen 6L, respectively; is configured as

Incidentally, the winding drum 51U is provided with a clutch mechanism (not shown) that locks the rotation of the drive shaft 2U when the lowering of the intermediate rail 7U is prevented by contact with an obstacle as an obstacle detection stop device. The take-up drum 51L is also provided with a clutch mechanism (not shown) that locks the rotation of the drive shaft 2L when the lowering of the bottom rail 7L is prevented by contact with an obstacle as an obstacle detection stop device.

One end of the drive shaft 2U is connected to the output shaft of the motor 9U via the drive shaft coupler 20U, and the rotation of the output shaft of the motor 9U is transmitted to the drive shaft 2U. Therefore, the driving force of the motor 9U rotates the drive shaft 2U, and the winding drum 51U winds or unwinds the lifting cord 3U based on the rotation of the drive shaft 2U, thereby enabling the intermediate rail 7U to move up and down. Thereby, the upper screen 6U can be raised and lowered. In addition, since the winding drum 51U uses the tension (the weight of the upper screen 6U and the intermediate rails 7U) associated with the lifting cord 3U when the upper screen 6U is lowered, the driving force is transmitted through a clutch mechanism (not shown). is transmitted from the winding drum 51U to the drive shaft 2U, and the drive force applied to the drive shaft 2U is adjusted to control the descent.

One end of the drive shaft 2L is connected to the output shaft of the motor 9L via the drive shaft coupler 20L, and the rotation of the output shaft of the motor 9L is transmitted to the drive shaft 2L. Therefore, the driving force of the motor 9L rotates the drive shaft 2L, and the winding drum 51L winds or unwinds the lifting cord 3L based on the rotation of the drive shaft 2L, thereby enabling the bottom rail 7L to move up and down. Thereby, the lower screen 6L can be raised and lowered. In addition, since the winding drum 51L utilizes the tension (the weight of the lower screen 6L and the bottom rail 7L) associated with the lifting cord 3L when the lower screen 6L is lowered, the driving force is transmitted through a clutch mechanism (not shown). is transmitted from the winding drum 51L to the drive shaft 2L, and the driving force associated with the drive shaft 2L is adjusted to control the descent.

Drive control of each of the motors 9U and 9L is performed by a control device 10 arranged inside the headbox 1 . A DC power supply 11 that supplies electric power to the motors 9U and 9L and the control device 10 is arranged in the headbox 1 . When the control device 10 receives an operation signal from the operation device 25 for operating the opening and closing of each shielding member (the upper screen 6U as the upper shielding member and the lower screen 6L as the lower shielding member), the control device 10 receives the operation signal included in the operation signal. It performs various controls of the electric shielding device corresponding to various commands received. For example, by configuring the motors 9U and 9L as DC motors respectively, by controlling the duty ratio of pulse signals supplied from the control device 10 to the motors 9U and 9L, the control device 10 controls the rotational speeds of the motors 9U and 9L. can be controlled. Encoders 8U and 8L for detecting the rotational speed and amount of rotation of the drive shafts 2U and 2L are arranged in the head box 1, and the controller 10 responds to the pulse signals output from the encoders 8U and 8L. Based on this, the encoder pulse speed and the count value of the number of pulses are managed to control the rotation speed and rotation amount of the motors 9U and 9L. Through such operations, the control device 10 appropriately adjusts the elevation speed of the upper screen 6U or the lower screen 6L in response to various commands included in the operation signal, and It controls the elevation stop position of the screen 6L.

In the electric pleated screen of this embodiment configured in this manner, the intermediate rail 7U is pulled up to just below the headbox 1, and the top screen 6U is folded between the headbox 1 and the intermediate rail 7U. When the lower screen 6L is lowered from the headbox 1, the lower screen 6L is shielded to a desired position.

Further, when the intermediate rail 7U is lowered above the bottom rail 7L while the bottom rail 7L is lowered to the lower limit, the lower screen 6L is folded between the intermediate rail 7U and the bottom rail 7L, and the head box 1 and the intermediate rail 7L are folded. The upper screen 6U is shielded between the rails 7U. Therefore, for example, if the upper screen 6U is made of a light-receiving material and the lower screen 6L is made of a light-shielding material, it is possible to increase the degree of freedom in adjusting the amount of light.

By lowering the bottom rail 7L to the lower limit and positioning the intermediate rail 7U between the head box 1 and the bottom rail 7, the soft light passing through the upper screen 6U made of the light-receiving fabric can be taken in. can.

When the bottom rail 7L is pulled up to the upper limit and opened, the bottom rail 7L is pulled up together with the intermediate rail 7U, and the upper screen 6U and the lower screen 6L are folded between the head box 1 and the bottom rail 7L. can do.

(Configuration of control device)
FIG. 2 is a block diagram showing a schematic configuration of the control device 10 in the electric shielding device of one embodiment according to the present invention.

Upon receiving an operation signal from the operation device 25, the control device 10 performs various controls of the electric shielding device corresponding to various commands included in the operation signal. For example, the control device 10 manages the encoder pulse speed and pulse count value from the encoders 8U and 8L, controls the rotation speed and rotation amount of the motors 9U and 9L, and controls each shielding material (each screen and each bottom rail ) is appropriately adjusted, and the stop position of each shield is controlled.

As shown in FIG. 2, the control device 10 includes a microcomputer section 101, a storage section 102, a communication interface (IF) section 103, motor drive sections 107U and 107L, abnormality detection sections 108U and 108L, and a pulse detection section 109U. , 109L.

The communication IF unit 103, although comprehensively illustrated in FIG. , and outputs it to the microcomputer unit 101 .

For example, when the operation device 25 is configured to transmit an operation signal by short-range wireless communication, the communication IF unit 103 receives the operation signal from the operation device 25 and outputs the operation signal to the microcomputer unit 101 . It has a function, enables mutual communication between the microcomputer unit 101 and the operation device 25, and enables exchange of detailed commands regarding operations.

Further, the communication IF section 103 has a function of receiving an operation signal from the operation device 25 and outputting it to the microcomputer section 101 when the operation device 25 is configured to transmit an operation signal in the form of an infrared signal. have.

Further, when the operation device 25 is configured to transmit an operation signal by two-way or one-way wired communication, the communication IF unit 103 receives the operation signal from the operation device 25 and outputs it to the microcomputer unit. 101.

For example, the operating device 25 according to the present invention is configured such that the opening/closing position of each shielding material (the upper screen 6U as the upper shielding material and the lower screen 6L as the lower shielding material) cannot be specified. In addition to using individually operable wired or wireless switches, infrared switches, multi-switches, smartphones, tablets, personal computers, zone switches, dial switches, etc., each shielding material (upper screen 6U as an upper shielding material and lower screen The open/close position of each lower screen 6L) as a shielding material can be specified individually or simultaneously, and can be a multi-switch, smart phone, tablet, personal computer, zone switch, dial switch, etc. for wired or wireless operation. .

The motor drive units 107U and 107L are motor drivers that drive the motors 9U and 9L, respectively.

Abnormality detection units 108U and 108L are functional units that detect abnormal values (one or more of overcurrent/abnormal waveform current/abnormal waveform voltage) in motor drive units 107U and 107L, respectively, and notify microcomputer unit 101 of the abnormal values. .

The pulse detection units 109U and 109L are functional units that receive pulse signals from the encoders 8U and 8L, respectively, and notify the microcomputer unit 101 of them.

The microcomputer unit 101 reads out and executes a program stored in advance in the storage unit 102, thereby receiving operation signals received via the communication IF unit 103 and processing various commands included in the operation signals. . Thereby, the control device 10 that performs various controls of the electric shielding device can be configured as a computer.

The functions of the control device 10 realized by executing the program by the microcomputer unit 101 include receiving an operation signal, discriminating various commands contained in the operation signal, and performing various controls of the corresponding electric shielding device. While counting the presence or absence of encoder pulses and the number of encoder pulses via pulse detection units 109U and 109L that respectively receive pulse signals from encoders 8U and 8L, the count value is stored in storage unit 102 as appropriate. function to store and manage various settings related to the set upper limit position and set lower limit position of each shielding material that can be set according to the count value of the number of encoder pulses in the storage unit 102, and drive the motors 9U and 9L function to perform drive control of the motors 9U and 9L via the motor drive units 107U and 107L, respectively, and abnormal values (overcurrent/abnormal waveform current/abnormal waveform voltage) in the motor drive units 107U and 107L. ) are detected and notified to the microcomputer unit 101, the abnormal values are monitored through the abnormality detection units 108U and 108L.

In the electric screening device of the present embodiment, each of the motors 9L and 9U and the control device 10 are connected by motor harnesses. A physical detection switch for detecting the lower limit position is not provided. Even in this case, the control device 10 determines the absolute upper set lower limit position by the count value of encoder pulses obtained from the encoders 8L, 8U, or One or more of these methods, such as detecting an abnormal value (one or more of overcurrent/abnormal waveform current/abnormal waveform voltage), or detecting that there is no input of the encoder pulse for a predetermined time during operation control. , it is possible to detect the physical upper limit position and the physical lower limit position that define the physical up-and-down operable range for each of the upper screen 6U and the lower screen 6L. Based on the detected physical upper limit position and physical lower limit position, the control device 10 can perform various settings related to the setting upper limit position and the setting lower limit position of each shielding material.

(take-up unit)
FIG. 3 is a perspective view showing a schematic configuration of the winding unit 5 of one embodiment according to the present invention, and FIG. 4 is an exploded perspective view showing a schematic configuration of the winding unit 5. As shown in FIG. 4 is an exploded perspective view of the left winding unit 5 among the left and right winding units 5 shown in FIG. 1(a). 5 are reversed in the axial direction, but they all have the same structure and are composed of members that can be relocated in the left-right direction. 5(a) and 5(b) are plan views showing how the pulleys 55 and 56 of the cord exit member 54 in the winding unit 5 of the embodiment according to the present invention can be changed. be. 6 is a partially sectional front view showing the schematic configuration of the winding unit 5. As shown in FIG.

In particular, referring to FIG. 4, the winding unit 5 of the embodiment according to the present invention includes a shaft case 50, a winding drum 51U with a clutch mechanism 52U functioning as an obstacle detection and stopping device, Equipped with a winding drum 51L with a clutch mechanism 52L functioning as an obstacle detection and stopping device, a shaft cover 53, a cord exit member 54, a pulley 55 for the lifting cord 3U, and a pulley 56 for the lifting cord 3L. .

The shaft case 50 and the shaft cover 53 are configured as support members that rotatably support the winding drums 51U and 51L. as part of the support member attached to the Therefore, the cord outlet member 54 and the shaft case 50 in this embodiment are separate members as a preferred example from the standpoint of ease of assembly, but it is also possible to form them as an integral member.

First, the drive shaft 2U is inserted through the central shafts of the winding drum 51U and the clutch mechanism 52U, and similarly the drive shaft 2L is inserted through the central shafts of the winding drum 51L and the clutch mechanism 52L.

The winding drums 51U and 51L gradually move from the base end side where winding of the lifting cords 3U and 3L is started to the leading end portion provided with the cord attachment portion 51c for fixing one end of the lifting cords 3U and 3L. It has a cone shape with a smaller diameter, and is divided into a steep slope portion 51d having a steep slope on the base end side and a gentle slope portion 51e having a gentle slope from the steep slope portion 51d to the tip. Shafts 51b that partially accommodate the clutch mechanisms 52U and 52L are provided on the base end sides of the winding drums 51U and 51L, respectively, and the tip ends provided with the cord attachment portions 51c are respectively provided with shafts 51b. A cap member having a shaft portion 51a formed with a through hole 511 that penetrates the drive shafts 2U and 2L in a non-engaging manner is fixed. The steep slope portion 51d of each of the winding drums 51U and 51L has a larger diameter change than the gentle slope portion 51e.

Each clutch mechanism 52U, 52L transmits the rotation of the respective drive shafts 2U, 2L to the winding drums 51U, 51L, and transmits the driving force of the respective winding drums 51U, 51L to the drive shafts 2U, 2L. It has matching cylindrical rotating drums (not shown) and cylindrical cam clutches 52a that are axially slidable with respect to the respective rotating drums. A serrated cam portion 52b is formed on the peripheral wall of the cylindrical cam clutch 52a.

When the upper shielding material (the upper screen 6U having the intermediate rail 7U at the lower end) descends, the rotation of the winding drum 51U lags behind the rotation of the rotating drum engaged with the drive shaft 2U (that is, , when an obstacle is detected), the cam portion 52b of the cam clutch 52a in the clutch mechanism 52U protrudes axially from the shaft portion 51b of the winding drum 51U, and when the obstacle is removed, it retracts toward the shaft portion 51b. It is designed to slide to Similarly, when the lower shielding material (the lower screen 6L having the bottom rail 7L at the lower end) descends, the rotation of the winding drum 51L lags behind the rotation of the rotating drum engaged with the drive shaft 2L ( That is, when an obstacle is detected), the cam portion 52b of the cam clutch 52a in the clutch mechanism 52L projects axially from the shaft portion 51b of the winding drum 51U, and when the obstacle is removed, it retracts toward the shaft portion 51b. It's designed to slide.

In the winding drums 51U and 51L of the present embodiment, the rotation of the drive shafts 2U and 2L is transmitted through the clutch mechanisms 52U and 52L, but the clutch mechanisms 52U and 52L are not provided. In that case, the drive shafts 2U and 2L are configured to be engaged and inserted so as to transmit the rotation of the respective drive shafts 2U and 2L directly to the winding drums 51U and 51L so as not to rotate relative to each other.

The shaft case 50 has a bowl-shaped accommodation portion 50a as shown in the figure, which rotatably supports the winding drums 51U and 51L arranged side by side in the front-rear direction. A pair of ring-shaped bearings 50b provided on the base end side of the shaft case 50 in the front-rear direction are provided with tubular bearings of the clutch mechanisms 52U and 52L on the base end sides of the winding drum 51U and the winding drum 51L, respectively. of the cam clutch 52a is inserted and supported. A circular recess 50c provided on the tip side of the shaft case 50 supports the tip-side shaft portions 51a of the winding drums 51U and 51L, respectively. Note that the shaft case 50 has a symmetrical shape even if the arrangement is changed in the front-rear direction.

The shaft case 50 is also formed with a pair of bearing portions 50e for supporting the shaft portions 51b of the winding drums 51U and 51L, respectively, and a wall portion 50d is provided at the boundary between the pair of bearing portions 50e and the storage portion 50a. A step is formed. The shaft case 50 arranges the winding drums 51U and 51L side by side in the front-rear direction so that the winding drums 51U and 51L can rotate in a state where the boundary between the shaft portion 51b and the steep slope portion 51d of the winding drums 51U and 51L is located on the wall portion 50d. It has come to support. A convex portion 50f is formed on each bearing portion 50e, and when the cam portion 52b of the cam clutch 52a in each clutch mechanism 52U, 52L protrudes axially from the shaft portion 51b of each winding drum 51U, 51L, In addition, the rotation of the drive shafts 2U and 2L is locked by abutting on the respective projections 50f.

In order to fit the shaft cover 53 from above with the winding drums 51U and 51L mounted on the shaft case 50, the pair of bearings 50b and 50e for the winding drums 51U and 51L are provided in front and rear of the shaft case 50, respectively. An end wall piece 50g is formed upright, a plane portion 50i is formed between the pair of bearing portions 50b and 50e, and a fitting hole 50h is provided in each end wall piece 50g.

The shaft cover 53 has a body portion 53a that supports the shaft portions 51b of the winding drums 51U and 51L from above. A fitting convex portion 53c is formed in the approximate center portion of the front end side. A downwardly extending abutment piece 53d is formed at substantially the central portion of the main body portion 53a in the front-rear direction. With the abutting piece 53d abutted against the flat portion 50i of the shaft case 50, the fitting protrusions 53b and 53c are fitted into the fitting holes 50h formed in the end wall pieces 50g of the shaft case 50, respectively. By doing so, the shaft cover 53 can be fitted so as to rotationally support the shaft portions 51b of the winding drums 51U and 51L placed on the shaft case 50 from above.

By the way, the support member for rotatably supporting the winding drums 51U and 51L of the present embodiment uses the shaft cover 53 to wind the winding drums 51U and 51L at the steep slope portions 51d alone on both the left and right ends of the body portion 53a. A stepped protrusion 53e is formed so that the number of possible windings of the lifting cords 3U and 3L (7 in this example) is less than a predetermined number (certainly 3 or less). there is A curved surface 531 is formed between each projecting portion 53e and the steep slope portion 51d so as to maintain a gap smaller than the cord diameter of each lifting cord 3U, 3L. As a preferred example, the distal end portion 53f of each projection portion 53e is made elastic by suppressing the thickness thereof in order to further improve the function of the force-winding, so that it can be in line contact with the lifting cords 3U and 3L. It is formed in a substantially triangular shape when viewed from above so that point contact may be possible (described later with reference to FIGS. 10 and 11). Since the lifting cords 3U and 3L may be in line contact or point contact, the tip 53f of each protrusion 53e may have a circular, elliptical, or other polygonal shape when viewed from above. Therefore, each protrusion 53e has a function of sequentially pushing and winding the lifting cords 3U and 3L even when the winding drums 51U and 51L are rotating at a low speed.

That is, in the example shown in FIG. 4, each of the lifting cords 3U and 3L is slidably wound around the winding drums 51U and 51L one by one by the protrusions 53e provided on both sides of the right end of the main body 53a. You will be able to pick up. A total of four stepped protrusions 53e are provided on both sides of the left and right ends of the main body 53a in order to allow the take-up unit 5 to be rearranged in the horizontal direction. Further, each protrusion 53e having such a force winding function can be provided on the shaft case 50 side instead of being provided on the shaft cover 53. As shown in FIG. However, by providing the projections 53e on the shaft cover 53 side, the lifting cords 51U and 51L can be pushed in at the position where the winding drums 51U and 51L start winding, so the performance of the pushing winding is improved. can be further improved.

In addition, in order to fit a cord exit member 54 from the bottom side of the shaft case 50 for guiding the lifting cords 3U and 3L hanging from the winding drums 51U and 51L through pulleys 55 and 56, Openings 50j, 50K, and 50m are provided in the front-rear direction, and plate-like receiving pieces 50n are formed between the openings 50j, 50K and between the openings 50j, 50m, respectively, and both left and right ends of each abutment piece 50n are formed. is formed with a fitting receiving portion 50p.

The cord exit member 54 is a member that rotatably supports the pulleys 55 and 56 and guides the lifting cords 3U and 3L hanging down from the winding drums 51U and 51L via the pulleys 55 and 56. . In particular, the cord outlet member 54 is arranged such that the shafts 55a and 56a of the respective pulleys 55 and 56 are arranged non-parallel to the axial direction of the respective winding drums 51U and 51L, i. Guidance is provided by reducing the load (at least the feed-out load) associated with hanging from 51U and 51L.

More specifically, the cord outlet member 54 has an outer shape in which a cover wall 54b having a substantially U-shaped cross section is formed upright on the rear end side of a substantially flat plate-shaped body, and the front end side of the substantially flat plate-shaped body is formed. And, an abutment piece 54a is formed substantially in the center in the front-rear direction. A pair of hooking pieces 54e project forward near both left and right ends of the abutting piece 54a on the front end side of the substantially flat plate-shaped main body, and the abutting piece 54a is formed at the approximately central portion in the front-rear direction of the substantially flat plate-shaped main body. A pair of claw portions 54f are formed to protrude rearward near both ends in the left-right direction. The pair of hooking pieces 54e and the pair of claws 54f are fitted with fitting receiving portions 50p formed in front and behind the opening 50j of the shaft case 50, respectively, and the cord exit member 54 is attached to the shaft case 50 from below. (described later with reference to FIG. 7(a)).

When the cord exit member 54 is attached to the shaft case 50 from below, the openings 50j and 50k of the shaft case 50 are closed by the body shape of the cord exit member 54 including the cover wall 54b. Here, the opening 50m of the axle case 50 is not closed. However, in this example, in order to change the arrangement of the winding unit 5 in the left-right direction, the arrangement of the cord outlet member 54 can also be changed in the front-rear direction. The openings 50j and 50m of the shaft case 50 are closed. Therefore, it is possible to provide a cover wall similar to the cover wall 54b at the front end side of the substantially flat plate-shaped main body so as to close the opening 50m. The cover wall 54b is provided only on the side where the mounting direction can be understood at a glance and the protrusion of the lifting cord 3U can be suppressed. A square protrusion 54k (see FIG. 7A) is formed below the bottom surface of the cord outlet member 54, and the square protrusion 54k is formed in the bottom surface of the head box 1 (see FIG. 7A). (not shown), and the end wall piece 50g of the shaft case 50 is engaged and placed in the head box 1, thereby suppressing back and forth, left and right, and up and down rattling.

In particular, in the cord outlet member 54 of the present embodiment, the insertion hole 54c for inserting the lifting cord 3U hanging down from the winding drum 51U is formed in the front-rear direction of the abutting piece 54a in the approximately central portion of the cord outlet member 54 in the front-rear direction. An insertion hole 54d is provided in the vicinity of the front side of the substantially central portion and is provided in the vicinity of the front side of the cover wall 54b of the cord exit member 54 in the front-rear direction substantially central portion for inserting the lifting cord 3L hanging down from the winding drum 51L. there is

As can be seen from the plan view (downward view) of the cord exit member 54 in FIGS. 5(a) and 5(b), there are two types of pulleys 55 for rotatably engaging and supporting the shafts 55a at both ends of the pulley 55. The pair of bearing portions 54g and 54h of the two types are provided so that the pulley 55 is arranged non-parallel to the axial direction of the winding drum 51U, that is, inclined. It's becoming Each of the pair of bearing portions 54g and 54h is formed with a substantially Ω-shaped bearing groove 541 so that the shaft 55a of the pulley 55 can be attached and detached, but once it is fitted, it will not easily come off. Similarly, two types of pair of bearings 54i and 54j are provided for rotatably engaging and axially supporting shafts 56a at both ends of the pulley 56. Both of the two types of pair of bearings 54i and 54j The pulley 56 is arranged non-parallel to the axial direction of the winding drum 51L, that is, inclined. Each of the pair of bearing portions 54i and 54j is formed with a substantially Ω-shaped bearing groove 542 so that the shaft 56a of the pulley 56 can be attached and detached, but once it is fitted, it will not easily come off. Although each of the pulleys 55 and 56 has the same shape, they may have different shapes with different diameters.

As shown in comparison with FIGS. 5(a) and 5(b), the pulleys 55 and 56 are set to have a plurality of symmetrical inclination angles that enable change of the installation orientation. That is, of the left and right winding units 5 shown in FIG. 1(a), the left winding unit 5 has pulleys 55 and 56 as shown in FIG. 5(a). 1(a), pulleys 55 and 56 are arranged as shown in FIG. 5(b) for the right winding unit 5. The winding unit 5 can be horizontally relocated with the same member.

Assuming that the inclination angles of the pulleys 55 and 56 with respect to the axial direction of the winding drums 51U and 51L are 0° when parallel and 90° when perpendicular, the angles shown in FIGS. In the illustrated example, an example in which the inclination angle is 30° is shown. is assumed. In FIG. 6, in the cord exit member 54, the shaft 55a of the pulley 55 is arranged non-parallel to the axial direction of the winding drum 51U, that is, inclined, and the load associated with the hanging of the lifting cord 3U from the winding drum 51U is shown. It shows how the guidance is performed by reducing (at least the delivery load).

FIG. 7(a) is a partially cross-sectional side view showing a schematic configuration of a winding unit 5 of an embodiment according to the present invention, and FIG. 7(b) is a side view of FIG. It is a simplified diagram illustrating the arrangement of pulleys 55 and 56 in an easy-to-understand manner. As shown in FIG. 7(a), the pair of hooking pieces 54e and the pair of claws 54f of the cord exit member 54 are fitted with fitting receiving portions 50p formed in front and behind the opening 50j of the shaft case 50, respectively. , and the cord outlet member 54 can be attached from below the shaft case 50 . As shown in FIGS. 7(a) and 7(b), by using the shaft cover 53 on which each protrusion 53e is formed, the winding drums 51U and 51L are driven at a low speed by the function of the tip 53f of each protrusion 53e. Also in rotation, the lifting cords 3U and 3L are pushed and wound sequentially. Furthermore, by using the cord outlet member 54 in which the shafts 55a and 56a of the pulleys 55 and 56 are arranged non-parallel to the axial direction of the winding drums 51U and 51L, that is, at an angle, the lifting cords 3U and 3L can be wound. The load (at least the feed-out load) associated with hanging down from the take-up drums 51U and 51L is reduced and guided.

As understood from FIG. 7(b), the cord outlet member 54 is arranged not only with the pulleys 55 and 56 inclined, but also with the shape of the winding drums 51U and 51L. The distances La and Lb from the central axes of the winding drums 51U and 51L may be the same, or as different distances as in this example, two types of a pair of bearings 54g and 54h and two types of a pair of bearings 54i, 54j may be formed. That is, the pulleys 55 and 56 are provided between the corresponding winding drums 51U and 51L and the insertion holes 54c and 54d through which the lifting cords 3U and 3L are led out to the outside. Based on the positional relationship between the take-up drum 51U and the insertion hole 54c and the positional relationship between the take-up drum 51L and the insertion hole 54d, the distances La and Lb to the respective winding drums 51U and 51L are set.

Further, in this embodiment, as shown in FIGS. 7A and 7B, the lifting cord 3U is suspended from the right side (rear side) of the winding drum 51U in the figure, and suspended through the pulley 55 to the insertion hole 54c. In this example, the winding direction of the winding drum 51U is reversed, and the lifting cord 3U is suspended from the left side (front side) of the winding drum 51U in the figure, and is inserted through the pulley 55 into the insertion hole 54c. Also in this case, since the pulley 55 is arranged at an angle, it is possible to reduce the load (at least the feed-out load) associated with the suspension from the winding drum 51U and guide it. Similarly, an example is shown in which the lifting cord 3L is suspended from the right side (rear side) of the winding drum 51L in the drawing and is suspended to the insertion hole 54d via the pulley 56, but the winding direction of the winding drum 51L is reversed. side, the lifting cord 3L may be suspended from the left side (front side) of the winding drum 51L in the figure and suspended in the insertion hole 54d via the pulley 56. Therefore, it is possible to reduce the load (at least the feed-out load) associated with the drooping from the winding drum 51L and guide it.

(Conventional comparison of descending performance)
FIG. 8(a) is a simplified plan view showing the lowering performance of a winding unit 5P of a comparative example based on the prior art, and FIG. 8(b) is a winding unit 5 of an embodiment according to the present invention. is a simplified plan view showing the operation related to the descending performance of the . In FIG. 8, the same reference numerals are given to the same components as described above.

First, in the winding unit 5P of the comparative example shown in FIG. 8(a), the slit-shaped guide portion S disclosed in Patent Document 1 is provided in the cord exit member 54, although it is not exactly illustrated, and the winding unit 5P A configuration in which the lifting cord 3U hanging down from the drum 51U is inserted through the insertion hole 54c through the slit-shaped guide portion S is illustrated. Further, in the winding unit 5P of the comparative example shown in FIG. 8A, a pulley 54d parallel to the axial direction of the winding drum 51L as disclosed in Patent Document 2 is provided on the cord outlet member 54, A configuration is illustrated in which the lifting cord 3L hanging down from the take-up drum 51L is inserted through the insertion hole 54d via the pulley 54d parallel to the axial direction of the take-up drum 51L.

In the winding unit 5P of the comparative example based on such a prior art, as shown in FIG. 8(a-1), the electric shielding device As such, since the winding drums 51U and 51L are normally rotated at a lower speed than the manual shielding device, the lower speed rotation increases the feeding load of the lifting cords 3U and 3L. For this reason, near the lower limit of the upper shielding material (upper screen 6U), the load component on the bulkhead for preventing random winding in the slit-shaped guide portion S when guiding the lifting cord 3U for the upper shielding material to the winding drum 51U However, it becomes so large that it cannot be ignored for low-speed descending motions, and the upper shielding material cannot be sufficiently lowered to the lower limit position of the vertical movement, which may cause a problem in lowering performance of the upper shielding material. Also, in the vicinity of the lower limit of the lower shielding material (lower screen 6L), the shaft cover 54 (or the central axis of the winding drum 51L shown in the figure) for guiding the lifting cord 3L for the lower shielding material to the winding drum 51L. On the other hand, the load component of the parallel pulley 54d) becomes so large that it cannot be ignored with respect to the low-speed descending motion, and the lower shielding material cannot be sufficiently lowered to the lower limit position of the vertical movement, resulting in a problem in lowering performance of the lower shielding material. Sometimes.

Incidentally, in the winding unit 5P of the comparative example based on such a prior art, as shown in FIG. ), even if the winding drums 51U and 51L are rotated at a lower speed than the manual shielding device as the electric shielding device, the feed-out load of the lifting cords 3U and 3L is small and there is no problem in the descent performance.

On the other hand, in the winding unit 5 according to one embodiment of the present invention shown in FIG. 8(b), although not exactly shown, the pulleys 55 are not balanced with respect to the central axes of the winding drums 51U and 51L, that is, the pulleys 55 are inclined. , 56 are provided on the cord outlet member 54, and the lifting cord 3U hanging down from the winding drum 51U is inserted through the insertion hole 54c via the inclined pulley 55, and the lifting cord 3L hanging down from the winding drum 51L is passed through the insertion hole 54c. A configuration for inserting through the insertion hole 54d via the inclined pulley 56 is illustrated.

In the winding unit 5 of the embodiment according to the present invention, as shown in FIG. 8(b-1), the electric shielding device As a result, even if the rotation speed is lower than that of the manual shielding device, the feed-out load of the lifting cords 3U and 3L does not increase, and the feed-out load can be reduced as compared with the conventional technology. As a result, the upper shielding material can be sufficiently lowered to the lower limit of elevation with a margin, and the lowering performance of the upper shielding material can be improved as compared with the conventional technology.

Moreover, in the winding unit 5 of the embodiment according to the present invention, as shown in FIG. ), even if the winding drums 51U and 51L are rotated at a lower speed than the manual shielding device as the electric shielding device, the sending load of the lifting cords 3U and 3L is small and there is no problem in the descent performance.

Therefore, according to the electric shielding device of the present embodiment having the winding unit 5 of the embodiment of the present invention, it is possible to improve the lowering performance of the upper shielding material and the lower shielding material. Similarly, in the electric shielding device configured with a single shielding material, the lowering performance of the single shielding material can be improved by adopting a configuration including the inclined pulley in the winding unit 5 of the embodiment of the present invention. can be improved.

In the winding unit 5 of one embodiment of the present invention, pulleys 55 and 56 are arranged between the winding drums 51U and 51L and the corresponding insertion holes 54c and 54d of the cord outlet member 54, respectively. However, an example in which the slit-shaped guide portion S disclosed in Patent Document 1 is not provided is shown. However, as another embodiment of the winding unit 5 according to the present invention, the cord exit member 54 having a slit-shaped guide portion S provided between the pulleys 55 and 56 and the corresponding insertion holes 54c and 54d may also be used. good.

(Modified example of pulley arrangement)
FIG. 9(a) is a partially cross-sectional side view showing a schematic configuration of a winding unit 5 according to a modification of the present invention, and FIG. 9(b) is a winding unit of a modification according to the present invention. 5 is a plan view showing how pulleys 55 and 56 of the cord exit member 54 in FIG. 5 can be changed. In FIG. 9, the same reference numerals are given to the same components as described above.

First, as a winding unit 5 of a modified example according to the present invention, as can be understood from FIG. It may be spatially inclined with respect to the central axis, including front and back and up and down. In other words, the cord outlet member 54 is arranged at a distance La (in this example, La1, La2) and Lb (Lb1 and Lb2 in this example) are set at different distances so as to further reduce the load. 54i, 54j may be formed. That is, also in this example, the respective pulleys 55, 56 are provided between the corresponding winding drums 51U, 51L and the through holes 54c, 54d provided to lead out the lifting cords 3U, 3L to the outside. However, the distance La (in this example, La1, La2) and Lb (Lb1 and Lb2 in this example) are set. In addition, not only the relationship in the height direction of each pulley 55, 56, but also the relationship in the front-rear direction are individually set as a pair of bearing portions 54g, 54h of two or more types, and a pair of bearing portions of two types. 54i, 54j may be formed. Alternatively, a plurality of types of cord exit members 54 having different heights and inclination angles of the pulleys 55 and 56 may be prepared in advance, and selected according to the shape of the winding drums 51U and 51L.

For example, in FIG. 9B, four types of pairs of bearings 54g-1, 54g-2 and 54h-1, 54h-2, and four types of pairs of bearings 54i-1, 54i-2, , and 54j-1, 54j-2. In the cord exit member 54 illustrated in FIG. 9(b) as well, each pulley 55 and each pulley 55 are arranged so as to change the arrangement of the cord exit member 54 in the front-rear direction so that the take-up unit 5 can be rearranged in the left-right direction. A plurality of symmetrical angles of inclination of 56 are set to enable rearrangement of the installation direction.

(Replacement of shaft cover)
FIGS. 10(a) and 10(b) are plan views showing how the shaft cover 53 of the winding unit 5 of the embodiment according to the present invention can be changed. 11(a) and 11(b) show the push force associated with the winding of the lifting cords 3U and 3L by the protrusion 53e of the shaft cover 53 of the embodiment in the winding unit 5 of the embodiment according to the present invention, respectively. FIG. 10 is a plan view showing the state of line contact and point contact during winding.

As shown in FIGS. 10(a) and 10(b), the shaft cover 53 of this embodiment is provided with the respective winding drums 51U on both the left and right ends of the body portion 53a, as described with reference to FIGS. , 51L are protruded so that the winding number (in this example, 7 windings) of each of the lifting cords 3U, 3L that can be taken up by a single steep slope portion 51d of 51L is less than a predetermined number (certainly, 3 windings or less). A stepped protrusion 53e is formed. As a preferred example, the distal end portion 53f of each projection portion 53e is made elastic by suppressing the thickness thereof in order to further improve the function of the force winding, and is formed in a substantially triangular shape when viewed from above. This substantially triangular tip portion 53f has a vertex at a point contact portion Pv that enables point contact with each of the lifting cords 3U and 3L, and both sides of the vertex can make line contact with each of the lifting cords 3U and 3L. It has a shape of a line contact portion Ps. As shown in FIG. 10(a) or FIG. 10(b), the shaft cover 53 of this embodiment has a symmetrical structure in the left-right direction with respect to the vertical central axis. The slope of Ps is maintained. Furthermore, in some cases, even if the device is turned upside down as compared with FIGS. 10(a) and 10(b), the inclination of the line contact portion Ps that enables line contact is maintained. If the tip 53f of the protrusion 53e has a shape that enables the push-winding operation for winding the lifting cords 3U and 3L, it is in line contact with the lifting cords 3U and 3L (see FIG. 11(a)). However, since point contact (see FIG. 11(b)) is also possible, the shape of the tip 53f of each protrusion 53e as viewed from above may be circular, elliptical, or any other polygonal shape.

Therefore, the tip 53f of each protrusion 53e has a shape that enables line contact including at least point contact with the lifting cords 3U and 3L. For this reason, each protrusion 53e has a function of sequentially pushing and winding the lifting cords 3U and 3L even when the winding drums 51U and 51L rotate at a low speed, thereby improving the lifting performance of the upper shielding material and the lower shielding material. can be pressed.

(Conventional comparison of climbing performance)
FIG. 12(a) is a simplified plan view showing the operation of a winding unit 5P of a comparative example based on the prior art, and FIG. 12(b) is a winding unit 5 of an embodiment according to the present invention. FIG. 10 is a simplified plan view showing the operation related to the climbing performance of the In FIG. 10, the same reference numerals are given to the same components as described above.

First, in the winding unit 5P of the comparative example shown in FIG. 12(a), for example, the flat end portion 53E (at least the steep slope portion 51d of each of the winding drums 51U and 51L according to the present invention alone) is not exactly shown. There is no protrusion 53e that reduces the number of windings (7 in this example) of the lifting cords 3U and 3L that can be wound up by a predetermined number of windings (certainly, 3 windings or less). ) to support the base ends of the winding drums 51U and 51L from above.

In the winding unit 5P of the comparative example based on such a prior art, as can be understood from FIG. The take-up drums 51U and 51L rotate at a low speed, and at such low-speed rotation, the take-up drums 51U and 51L repeat "4 to 5 windings and slides", and the lifting cords are moved by the take-up drums 51U and 51L. It is difficult for cord slippage to occur during winding, and a jerking phenomenon occurs in which each of the upper shielding member and the lower shielding member rises jerkily, which may cause a problem in lifting performance.

On the other hand, in the winding unit 5 according to the present invention shown in FIG. 12(b), the winding drums 51U and 51L each have a step-like protruding part so that the lifting cords 3U and 3L have three turns or less on the steep slope portions 51d of the winding drums 51U and 51L. A shaft cover 53 having a projection 53e is provided. Each protrusion 53e has a function of sequentially pushing and winding the lifting cords 3U and 3L even when the winding drums 51U and 51L are rotating at a low speed. In order to assist the force-winding function, it is preferable that the tip portion 53f of each protrusion 53e has elasticity by reducing the thickness thereof, as in the present embodiment. Note that the tip portion 53f of each protrusion 53e of this embodiment is formed in a substantially triangular shape when viewed from above.

For this reason, in the winding unit 5 according to the present invention, as can be understood from the (planar cross-sectional view) of FIG. , 51L rotates at a low speed, and even at such a low speed rotation, the winding drums 51U and 51L repeat the operation of "slipping one turn at a time", and the jerking phenomenon does not occur, and the upper shielding material and the lower shielding material are each displaced. Climbing performance can be improved. Similarly, in the electric shielding device composed of a single shielding material, the lifting performance of the single shielding material is improved by providing the protrusion 53e in the winding unit 5 of the embodiment of the present invention. can be improved.

In the winding unit 5 according to the present invention, the structure of the cord outlet member 54 in which the pulleys 55 and 56 are inclined with respect to the central axes of the winding drums 51U and 51L in order to improve the lowering performance, and the improvement of the ascending performance. Therefore, the function of the tip 53f of the protruding part 53e is independent from the structure of the shaft cover 53 that sequentially pushes and winds the lifting cords 3U and 3L even when the winding drums 51U and 51L rotate at a low speed. Therefore, the winding unit 5 having either one or both of them can be configured.

Therefore, according to the present embodiment, it is possible to improve the lifting performance or the lowering performance of the shielding material in the electric shielding device that uses the cord-like lifting cord to enable the shielding material to be moved up and down by the driving force of the motor.

(Modified example of shaft cover)
13(a) and 13(b) respectively show the shape of a modified shaft cover 53 in a winding unit 5 according to an embodiment of the present invention, and each lift cord formed by the projection 53e of the modified shaft cover 53. FIG. 11 is a plan view showing a state of performing forced winding for winding 3U and 3L. In addition, in FIG. 13, the same reference numerals are given to the same components. As shown in FIG. 13(a), the protrusion 53e of the shaft cover 53 of this modified example has a shape that protrudes separately for each of the lifting cords 3U and 3L as shown in FIG. It has a shape that protrudes continuously for the lifting cords 3U and 3L. Even with such a shape of the shaft cover 53 of this modified example, as shown in FIG. The winding drums 51U and 51L rotate at a low speed when driven upward. Even at such low speed rotation, the winding drums 51U and 51L repeat "slipping one winding at a time", and the jerking phenomenon does not occur, and the upper shielding member does not occur. and lower shielding material can be improved. Also, in the shaft cover 53 of this modified example, as shown in FIG. The inclination of the portion Ps is maintained. Furthermore, in some cases, even if the device is turned upside down as compared with FIGS. 13(a) and 13(b), the inclination of the line contact portion Ps that enables line contact is maintained.

13(a) and 13(b) are also shown as projections 53e. , the support member has the function of limiting the number of windings of the lifting cord that can be wound up by the steep slope portion 51d of the winding drum 51U or 51L to a smaller predetermined number or less, and sequentially pushing and winding. may

Although the present invention has been described with reference to specific embodiments, the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the technical idea thereof.

For example, the electric shielding device is not limited to the electric pleated screen described above, but is limited to any device that can electrically raise and lower a single or a plurality of shielding materials using a string-like elevating cord. There is no need, for example, a pleated screen, a honeycomb screen that is also one of them, a horizontal blind, a tucked up curtain, etc., or a hybrid electric shielding device in which these different shielding materials are arranged vertically or in the front and back direction. good. In addition, in the above-described embodiment, the electric shielding device is mainly described as an example, but the winding unit 5 according to the present invention can also be applied to a manual shielding device that manually raises and lowers the shielding material, and the descending performance or the ascending performance is improved. can be improved.

Accordingly, the electrically powered shielding device according to the invention is not limited to the examples of embodiments described above, but only by the description of the claims.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to improve the elevating performance of an electric shielding device that allows the shielding member to be lifted and lowered by the driving force of the motor, and is therefore useful for the application of the electric shielding device.

1 Headbox 2U, 2L Drive shaft 3U Lifting cord for upper screen 3L Lifting cord for lower screen 5 Winding unit 6U Upper shielding material (upper screen)
6L lower shielding material (lower screen)
7U Intermediate rail 7L Bottom rail 8U, 8L Encoder 9U, 9L Motor 10 Control device 11 DC power supply 20U, 20L Drive shaft coupler 25 Operation device 50 Shaft case 51U, 51L Winding drum 53 Shaft cover 53e Projection 53f Tip of projection Part 54 Cord exit member 55, 56 Pulley

Claims (3)

A shielding device that allows the shielding material to be raised and lowered,
a winding drum for winding or unwinding an elevating cord for elevating the shielding material by raising and lowering a rail provided at the lower end of the shielding material;
a support member that rotatably supports the winding drum,
The shielding device, wherein the support member has a function of sequentially pushing and winding the lifting cord when the lifting cord is wound by the winding drum. The support member has a shaft cover provided on the base end side where the winding of the lifting cord on the winding drum is started,
The support member has a protrusion having a function of sequentially pushing and winding the lifting cord when the lifting cord is wound by the winding drum,
2. The shielding device according to claim 1, wherein the protrusion is provided on the shaft cover. The protrusion has a curved surface that is curved to maintain a gap smaller than the cord diameter of the lifting cord with respect to the base end,
3. The shielding device according to claim 2, wherein the tip of the protrusion has elasticity to assist the function of the force winding.

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