JPH0124329B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a fixed position stopping device for a rotating shaft connected to a slat of a blind, etc., for stopping the rotating shaft at a predetermined angular position.

BACKGROUND ART Fixed position stopping devices for rotating shafts are used, for example, in blinds of the type in which slats are tilted and positioned using the driving force of a motor. In this type of blind, when the slats are placed in a predetermined tilting position, the ladder cord connected to the slats is wound by a winding drum on a rotating shaft connected to the motor as the motor is driven. After the rotating shaft has been rotated by a predetermined angle, a protrusion on the rotating shaft engages with an elastic piece of a limit switch, which will be described later, to stop the motor.

Now, the circuit configuration and limit switch configuration in this conventional configuration will be explained according to FIGS. 1 and 2. In particular, when one operation switch 1 is switched from the state shown in FIG. One limit switch 3 in the closed state
The motor 4 is energized via the motor 4, and the motor 4 is rotated in the forward direction. When the rotating shaft (not shown) is rotated by a predetermined angle as the motor 4 rotates in the normal direction, a protruding piece (not shown) on the rotating shaft engages the limit switches 3 and 1.
0 (see FIG. 2). Thereby,
As shown in FIG. 2b, the contact 5a on the central elastic piece 5 is separated from the contact 6a on one elastic piece 6, one limit switch 3 is opened, the motor 4 is stopped, and the rotation axis is set at a predetermined position. It is stopped at the angular position. Then, the slat is placed at a predetermined tilting position via the winding drum and the ladder cord.

When the one operating switch 1 is returned and the other operating switch 8 is switched while the one limit switch 3 is in the open state, the motor is 4 is energized and the motor 4 is reversed. As a result, the rotating shaft is reversed, the protruding pieces on the rotating shaft are separated from the central elastic piece 5, and the elastic pieces 5 to 7 return to their original positions as shown in FIG. 2a. When the rotation axis is continuously reversed and the protruding piece re-engages with the central elastic piece 5, the contact point 5b on the central elastic piece 5 is connected to the other elastic piece as shown in FIG. 2c. 7, the other limit switch 10 is opened, the motor 4 is stopped, and the rotating shaft is stopped at an angular position different from the above-mentioned angular position. The slat is arranged at a tilting position different from the above-mentioned tilting position via the winding drum and the ladder cord.

However, in this conventional configuration, a pair of limit switches are connected in series to the motor, each limit switch is connected in parallel to each other, and the diode is connected in series to the limit switch. There are problems such as premature contact fatigue and early damage to diodes, which necessitates the use of durable and expensive contacts and diodes, resulting in high manufacturing costs. It was hot.

Purpose This invention was made in order to eliminate the above-mentioned defects, and its purpose is to provide a device with a simple structure, compact size, and excellent durability by using inexpensive limit switches and diodes. An object of the present invention is to provide an inexpensive fixed position stopping device for a rotating shaft.

Embodiment An embodiment of the invention as a blind will be described below with reference to the drawings.As shown in FIGS. 3 and 4, a head box 2 that can be hung on a window frame, etc.
A rotating shaft 22 is rotatably supported within the rotating shaft 1, and a winding drum 23 is mounted on the rotating shaft 22. A large number of slats 25 are supported at the bottom of the head box 21 by a ladder cord 24 consisting of two warp threads 24a, 24b and two weft threads 24c, 24d. The upper end is the winding drum 23
The lower end is fixed to the bottom rail 26. And the winding drum 23
When it is rotated in one direction, as shown in FIG.
is tilted. Further, when the winding drum 23 is rotated in the other direction, the slat 25 is tilted in the opposite direction.

A lifting cord 27 for raising and lowering the slats 25 together with the bottom rail 26 is inserted through each slat 25 and connected to the head box 21.
It hangs down to one side of the blind via the inner pulling mechanism 28, and is fixed at one end to the vicinity of both ends of the bottom rail 26, and at the other end to one end surface of the bottom rail 26.

Next, a fixed position stopping device for the rotating shaft 22 will be explained.

As shown in FIGS. 3 and 5, the inner end of the head box 21 is equipped with a DC motor 29 that can rotate in forward and reverse directions.
is provided. The operation switch 30, which has a built-in dry cell battery and is connected to the dry cell battery, is connected to a connection cord 31.
The motor 29 is connected to the motor 29 through a connector 32, and by selectively operating a pair of operation buttons 30a and 30b of the operation switch 30, the motor 29 can be rotated forward or reverse. In the head box 21, the motor 2
A reduction gear box 33 is provided between the rotary shaft 22 and the rotary shaft 22, and the gear box 33 is connected to the operating shaft 3 so as to be rotated at a reduced speed in conjunction with the motor 29.
4 is supported. The reduction gearbox 33
A support member 36 in the shape of a box with an open top and a bottom is supported on a support plate 35 fixed to one side of the
A lid 37 is attached to the support member 36 by four attachment pieces 37a. The support member 36
A pair of bearing parts 38 and 39 facing each other are formed at the joint between the lid body 37 and the lid body 37.
The operating shaft 34 is inserted through the.

A connecting shaft 40 is provided between the operating shaft 34 and the rotating shaft 22 so as to be located on the supporting member 36, and both ends of the connecting shaft 40 are connected to the ends of the operating shaft 34 and the rotating shaft 22. are attached to each. Further, the connecting shaft 40 is supported by the other bearing portion 39 in the groove portion 41 . When the motor 29 is driven, the rotating shaft 22 is rotated in forward and reverse directions via the operating shaft 34 and the connecting shaft 40. A pair of engaging protrusions 42 and 43 are integrally formed on the outer periphery of the connecting shaft 40 at a predetermined interval so as to protrude in substantially the same direction.

As shown in FIGS. 5 to 8, a support stand 44 is protruded from the bottom surface of the support member 36, and the support stand 44
A first elastic piece 45 as an elastic member made of a spring material, a second elastic piece 46 as a first contact member, and a third elastic piece 47 as a second contact member are located near their proximal ends. It is supported by Further, the elastic pieces 45 to 47 are arranged in parallel at predetermined intervals. A holding member 48 for holding the three elastic pieces 45 to 47 is mounted on the support base 44, and the holding member 48 is attached to the bottom surface of the support member 36 with two screws 49. The first elastic piece 45 located in the center among the three elastic pieces 45 to 47 is connected to the first and second small pieces 11, 1 extending in the axial direction of the connecting shaft with the slit 50 in between.
2, the first small piece 11 has a proximal end supported by the holding member 48, a distal end extending in the axial direction of the connecting shaft 40, and a second small piece 12.
The proximal end portion is integrally connected and supported to the distal end portion of the first small piece 11, and the proximal end portion extends toward the proximal end side of the first small piece 11, and the third elastic piece 4
It is curved toward the 7 side, that is, in the contact closing direction. Further, on the upper edge of the second small piece 12, a pair of engagement pieces 51 and 52 are provided as a pair of engagement parts corresponding to the pair of engagement protrusions 42 and 43 of the connecting shaft 40.
is formed protrudingly. Furthermore, each engagement piece 51,
Contact pins 53 and 54 are fixed to the first elastic piece 45 at the base end of the elastic piece 52, respectively.

The second elastic piece 46 located on one side of the first elastic piece 45 is bent into a substantially chevron-shaped planar shape, and a contact pin 46a fixed to the tip thereof is attached to the first elastic piece 45 side. The pin 46a is separably engaged with the contact pin 54 on the first elastic piece 46. A third elastic piece 47 located on the other side of the first elastic piece 45 is formed shorter than the first and second elastic pieces 45 and 46, and a contact pin 47a fixed to the tip thereof is connected to the third elastic piece 47 on the other side of the first elastic piece 45. The contact pin 53 of the elastic piece 45 is separably connected to the contact pin 53 of the first elastic piece 45 . Then, the first and second elastic pieces 4
5, 46, etc. constitute the first limit switch _L1 , and the first and third elastic pieces 4
5, 47, etc. constitute a second limit switch _L2 , and each limit switch _L1 , _L2 is connected in series to the motor 4, as shown in FIG. Furthermore, diodes 55 and 56 are connected between the first elastic piece 45 and the second elastic piece 46 and between the first elastic piece 45 and the third elastic piece 47, respectively. As shown in the figure, each of the diodes 55 and 56 is connected to each of the limit switches.
Connected in parallel to L ₁ and L ₂ .

Next, the operation of the blind configured as described above will be explained.

Now, as shown in FIG. 3, when the slats 25 of the blind are placed horizontally,
As shown in FIGS. 7 and 8, the pair of engaging protrusions 42 and 43 on the rotation shaft 22 are arranged in a vertical position. When one operation button 30a of the operation switch 30 is continuously pressed in this state, the current from the power supply passes through the motor 29 and the first limit switch _L1 , and then the second limit switch L ₂ and diode 56 and returns to the power supply (in the direction of the arrow in FIG. 9). At this time, the motor 29 is rotated in the normal direction, and as shown in FIGS.
The rotating shaft 22 is rotated clockwise in FIG. 8 via the rotating shaft 22, and the slat 25 begins to be tilted by the cooperation of the winding drum 23 on the rotating shaft 22 and the ladder cord 24. Then, as shown in Figures 5, 7, and 8,
When the right engaging protrusion 43 on the connecting shaft 40 engages with the right engaging piece 52 of the first elastic piece 45, the first elastic piece 45 moves against its own elastic force. is bent toward the elastic piece 47 side, and the contact pin 54 on the first elastic piece 45 is bent toward the contact pin 46 on the second elastic piece 46.
Separate from a. As a result, the first limit switch _L1 is opened and the motor 29 is stopped.
The slat 25 is placed in a first tilting extreme position shown in phantom in FIG. At the same time, if the pressure on the one operating button 30a is released, the operating switch 30 is returned to the neutral position.

Further, when the other operation button 30b of the operation switch 30 is continuously pressed while the slat 25 is placed at the first tilting limit position and the first limit switch _L1 is opened,
At the beginning, the current from the power supply passes through the second limit switch _L2 and the diode 55 and returns to the power supply (in the direction opposite to the arrow in FIG. 9). At this time, the motor 29 begins to rotate in reverse, the rotation shaft 22 is rotated counterclockwise in FIG. 8 via the connection shaft 40, etc., and the right engaging protrusion 43 in FIG. 1
The elastic piece 45 is separated from the right engaging piece 52.
At the same time, the first elastic piece 45 returns due to its own elastic force, the contact pin 54 engages with the contact pin 46a of the second elastic piece 46, and the first elastic piece 45 returns to its original position.
limit switch _L1 is closed. after that,
The current passes through the first limit switch L ₁ and the diode 55 . Further, at the same time as the motor 29 reverses, the winding drum 2 on the rotating shaft 22
3 and the ladder cord 2, the slat 2
5 begins to be tilted in the opposite direction to that in the previous case.

Then, the connecting shaft 40 is continuously rotated counterclockwise in FIG. 8, and the left engaging protrusion 42 in FIG.
When engaged, the first elastic piece 45 is bent toward the second elastic piece 46 against its own elasticity, and the contact pin 53 on the first elastic piece 45 is bent to the third elastic piece 47.
It is separated from the upper contact pin 47a. As a result, the second limit switch _L2 is opened,
The motor 29 is stopped and the slat 25 is moved to the fourth position.
It is arranged at a second extreme tilt position (not shown) in the opposite direction to the first extreme tilt position shown by the chain line in the figure. Further, when placing the tilted slat 25 in a horizontal state, the pair of operation buttons 30
It is sufficient to press either one of a and 30b and release the pressing operation when the slat 25 is placed in a horizontal state.

In this embodiment, the limit switches L ₁ and L ₂ are composed of three elastic pieces 45 to 47, and the base ends of the pair of engagement pieces 51 and 52 provided on the first elastic piece 45 are Since the three members 45 to 47 are engaged with each other by their own elastic force, there is no possibility that the three members 45 to 47 will be separated from each other by mistake. Further, the second elastic piece 46 is formed into a substantially chevron-shaped planar shape, and the left engagement piece 51 of the first elastic piece 45 is arranged slightly deviated toward the third elastic piece 47 side. Therefore, the engagement between the three members 45 to 47 can be made even more reliable. Furthermore, since the diodes 55 and 56 are connected in parallel to each limit switch L ₁ and L ₂ ,
When each limit switch L ₁ , L ₂ is closed, the current flows between the limit switches L ₁ , L ₂ and the diode 55,
56, so both L ₁ , L ₂ ,
55, 56 can be improved.

Further, the present invention is not limited to the above-mentioned embodiments, and can be embodied in devices other than blinds.

Effects As detailed above, the present invention can improve durability despite the use of inexpensive limit switches and diodes, and since the elastic member is commonly used for the first and second limit switches, The number of parts can be reduced, and the structure can be simplified and made more compact.
Further, since the contacts of both limit switches are always urged in the closing direction by the elastic force of the curved elastic member, there is no possibility that when one limit switch is opened, the other limit switch will be opened.

[Brief explanation of drawings]

1 and 2 show a conventional example of the present invention, FIG. 1 is a circuit diagram, and FIGS. 2 a to 2 c are explanatory diagrams of the operation of a limit switch. Figures 3 to 9 show an embodiment of the present invention, with Figure 3 being a perspective view of the main parts of the blind cut away, Figure 4 being a partial side view of the blind, and Figure 5 showing the blind in its normal position. FIG. 6 is an enlarged plan view showing the main parts of the fixed position stopping device, FIG. 7 is a sectional view taken along the - line in FIG. 6, and FIG. 6 is a sectional view taken along the - line in FIG. 6, and FIG. 9 is a circuit diagram of the fixed position stopping device. Rotating shaft...22, DC motor...29, operating switch...30, support member...36, connection shaft...
40, Engaging projections...42, 43, First, second and third elastic pieces...45, 46, 47, Slits...
...50, Engaging piece...51, 52, Diode...
55, 56, first limit switch...L ₁ ,
Second limit switch... _L2 .

Claims (1)

[Claims] 1. A motor 29 capable of forward and reverse rotation, an operation switch 30 for driving and stopping the motor 29, and a rotation shaft 22 rotated by the motor 29.
and a connecting shaft 40 that is provided between the motor 29 and the rotating shaft 22 and connects the two, and the connecting shaft 4
0, a pair of engaging protrusions 42 and 43 are arranged at a predetermined distance apart on the motor 29, and a normally closed motor 29 is connected in series to the motor 29 between the motor 29 and the operation switch 30. First and second limit switches L1, L
2, and a pair of diodes 55, 56 connected in parallel to each limit switch L1, L2, respectively.
A fixed position stopping device for a rotating shaft includes a first small piece 11 whose one end is supported by a holding member 48 and whose tip is arranged along the axial direction of the connecting shaft 40; An elastic member 45 is constituted by a second small piece 12 which is integrally provided at the tip of the small piece 11, whose tip extends toward the base end side of the first small piece 11, and whose tip is curved in the contact closing direction. Further, at both ends of the second small piece 12, a pair of engagement protrusions 42 and 43 are engaged and pressed in the contact opening direction when the pair of engagement protrusions 42 and 43 are rotated forward and backward by a predetermined angle, respectively. joint parts 51 and 52 are provided, a first contact member 46 and a second contact member 47 are spaced apart from each other along both sides of the elastic member 45, and the first limit switch L1 is connected to the first limit switch L1. It is composed of a contact member 46 and a distal end portion of an elastic member 45 whose distal end portion always comes into contact with the first contact member 46 due to its elastic force, and the second limit switch L2 is connected to the second contact member 46. A fixed position stopping device for a rotating shaft, characterized in that it is composed of a member 47 and the second small piece 12 that always comes into elastic contact with the second contact member 47. 2. The limit switches L1 and L2 have a first elastic piece 45 as an elastic member and a second contact member as a first contact member fixed to the holding member 48 in parallel to one side of the first elastic piece 45. and the holding member 4 in parallel on the other side of the first elastic piece 45.
The first elastic piece 45 is further provided with a pair of engaging pieces 51 and 52 as the pair of engaging parts.
The circuit according to claim 1, wherein the elastic pieces 45, 46, 47 are normally engaged with each other by their own elastic force at the proximal end of each engagement piece 51, 52. Fixed position stopping device for moving shaft. 3 a second elastic piece located on one side of the first elastic piece 45;
The elastic piece 46 is bent into a substantially chevron-shaped planar shape, and its tip is biased toward the first elastic piece 45. Device. 4 The pair of diodes 55 and 56 are connected to the first
between the elastic piece 45 and the second elastic piece 46 and the first
The device for stopping a rotating shaft in a fixed position according to claim 2, wherein the device is connected between the elastic piece 45 and the third elastic piece 47, respectively.