JPH0446070Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a winding shaft structure for an electric shutter installed in openings such as windows and doorways in buildings such as houses.

[Problems to be solved by the prior art and the invention] Generally, this type of electric shutter drives the winding shaft in forward and reverse directions using a drive motor that is mounted on the winding shaft (winding drum). , the shutter curtain is raised and lowered. However, in this case, the take-up shaft and drive motor are separate bodies, so the take-up shaft and drive motor must be arranged in parallel, and for this reason, they cannot be placed inside the shutter case. This has become a problem because it takes up a large amount of space, and there are limits to how much space can be made to make the shutter case smaller and lighter. Therefore, it has been proposed to configure the winding shaft as an integrated structure in which the drive motor is built into the winding drum, but in this case, the upper limit of the shutter curtain,
In devices in which the lower limit switch is opened and closed by counting the number of rotations of the motor shaft, it is difficult to find space for the limit switches inside the winding drum, and it is unavoidable to reduce the diameter of the winding drum. There is a problem in that a new drawback arises in that the diameter must be made large.

[Means for solving the problem] The present invention was created in view of the above-mentioned circumstances with the aim of providing a winding shaft structure for an electric shutter that can eliminate these drawbacks. A drive motor attached to a support shaft fixed to the bracket of the shutter case is installed inside the winding drum for winding the shutter curtain, which is rotatably supported on the support shaft, and the drive motor and winding drum are driven. The winding drum is rotated by the drive of the motor and is interlocked and connected to raise and lower the shutter curtain to form a winding shaft. A counter for opening and closing the lower limit switch is provided, and the counter is interlocked and connected to the winding drum so as to count in response to the rotation of the winding drum, and the reset buttons of both counters are connected within the winding drum and to the bracket. It is characterized by being placed in a position where it can be operated from a viewing window drilled in the.

With this configuration, the present invention incorporates the drive motor inside the winding drum, making it unnecessary to secure a space for installing the drive motor in the shutter case, while still allowing the counters of the upper and lower limit switches to be removed. The counter can be mounted while making effective use of the space within the winding drum, and the counter can be easily reset from the case bracket.

[Example] Next, an example of the present invention will be described based on an example shown in the drawings. In the drawing, reference numeral 1 denotes a shutter curtain of an electric shutter, and the shutter curtain 1 moves up and down along a guide rail 3 by forward and reverse rotation of a winding shaft 2, which will be described later. A drive motor 7 is installed inside the winding shaft 2 to open and close the winding shaft 2. That is, the outer end portions of a pair of support shafts 6, 6a are coaxially fixed to the left and right brackets 5a of the shutter case 5, and the drive motor 7 is fixed to the inner end portions of the support shafts 6, 6a. The motor case 7a is integrally fixed, and thereby both the support shafts 6,
6a and the drive motor 7 are connected and connected in the same straight line. The motor shaft 7b of the drive motor 7 protrudes at an eccentric position with respect to the axes of the support shafts 6 and 6a, and the drive gear 8 fixed to the motor shaft 7b is attached to the motor case 7a. The driven gear 9 meshes with the driven gear 9. On the other hand, 10 is a cylindrical winding drum rotatably supported on support shafts 6, 6a via bearings 11, and this winding drum 10 has the above-mentioned drive motor 7 inside. Winding drum 1
Internal tooth gear 12 integrally fixed to the inner circumferential surface of
The driven gear 9 is engaged with the driven gear 9. By rotating the drive motor 7 forward and backward by operating a push button switch (not shown), the winding drum 10 is rotated between the spindles 6 and 6.
The winding shaft 2 of this embodiment is constructed in this way.

Note that the winding drum 10 is integrally provided with an inner flange 10a that freely rotates in sliding contact with the support shaft 6a, but between the inner flange 10a and the support shaft 6a there is a shutter curtain A bullet 13 and a buffer bullet 14 are interposed in the direction in which the bullet 1 is hoisted.

Further, a lead wire 15 for the drive motor 7 is wired in the inner cylinder portion of the support shaft 6;
5 is extended out of the support shaft 6 in the middle, wired to a limit switch to be described later, and then pulled back into the support shaft 6 again. That is, although the flange portion 16 is integrally fitted and fixed to the support shaft 6,
Upper and lower limit switches 17 and 18 are provided on the flange portion 16 so as to be visible through the viewing window 5b of the bracket 5a. These limit switches 17 and 18 are micro switches 1
7a, 18a and counters 19, 20 having character wheels of multiple digits (three digits in this embodiment), the counters 19, 20 are opposed to each other with the support shaft 6 in between. It is arranged so that
Moreover, it is rotatably supported on the flange portion 16 by a pin shaft 21 . Furthermore, both counters 19, 2
A tension bullet 22 is interposed between the two counters, and the counter shaft 19a of one counter (hereinafter referred to as the "lower limit counter" for convenience) extends in the outer radial direction, and the counter shaft 19a of the other counter (hereinafter referred to as the "lower limit counter") The counter shafts 20a of 20 (hereinafter referred to as "upper limit counter" for convenience) are configured to urge each other toward the center.

On the other hand, the inner flange 23 of the winding drum 10 on the support shaft 6 side has an outer cylinder part 23a having the same diameter as the winding drum 10 and an inner cylinder part 23b having a smaller diameter than the bracket 5.
These two cylindrical parts 2 protrude toward the direction a.
3a, 23b, the counter shafts 19a, 20
Rollers 19b and 20b which are pivoted to a are arranged. The roller 19b of the lower limit counter 19 is mounted on the inner peripheral surface of the outer cylinder part 23a, and the roller 20b of the upper limit counter 20 is mounted on the outer peripheral surface of the inner cylinder part 23b.
Both counters 1 are brought into pressure contact by the biasing force of the tension bullet machine 22, and as described later, the forward and reverse rotation of the winding drum 10 due to motor drive causes both counters 1 to be brought into contact with each other.
9 and 20 are set to count in opposite directions. First, when the shutter curtain 1 is at the upper limit, both counters 19 and 20 are set as follows.
The reset buttons 19c and 20c are set to 0, 0, 0 by operating them through the viewing window 5c provided in the bracket 5a. Then lower the shutter curtain,
When the lower limit position is reached, the lower limit counter 19 is reset again to 0, 0, 0, while the upper limit counter 20 is assumed to display, for example, 9, 5, 0 at this time. When the counter curtain 1 is raised to the upper limit, the upper limit counter 2
0 will display 0, 0, 0, and the lower limit counter 19 will display 9, 5, 0. On the other hand, counters 19, 20 and micro switches 17a, 18a
are connected by known means (for example, Publication of Utility Model Publication No. 56-46270) so that they are open when the third digit, that is, the number in the hundreds place, is 0, and closed otherwise. In this manner, the upper and lower limit switches 17 and 18 of this embodiment are constructed.

In the embodiment of the present invention constructed as described above, when the push button switch for raising or lowering (not shown) is operated, the drive motor 7 is driven. The winding drum 10 housing the shutter curtain 1 rotates relative to the shutter curtain 1, and winds up or unwinds the shutter curtain 1 to open and close the opening.

As described above, in the present invention, the shutter curtain can be vertically moved up and down automatically by driving the drive motor 7, but the drive motor 7 is housed inside the winding drum 10. Therefore, there is no need to separately secure installation space for the drive motor 7 in the shutter case 5 as in the conventional case, and the shutter case 5 can therefore be made lightweight and compact. In the present invention, when the shutter curtain 1 is located at the lower limit or upper limit position, the third digit of the corresponding counter 19, 20 becomes 0, the micro switch 17a or 18a is opened, and the drive motor 7 is opened. However, the counters 19 and 20 stop when the drive motor 7 stops.
Since the system directly detects and counts the rotation of the winding drum 10 instead of directly detecting and counting the rotation of the winding drum 10, it is possible to freely set the mounting position regardless of the mounting position of the drive motor 7, and also to directly detect and count the rotation of the winding drum 10. rotation,
Direct detection is possible regardless of play between gears, and therefore accurate, reliable, and highly accurate upper and lower limit detection can be performed.

Moreover, in this invention, counts 19, 20
Since the reset buttons 19c and 20c can be operated from the viewing window 5b of the bracket 5a, when readjusting the upper and lower limit positions of the shutter curtain 1 after installing the electric shutter, it is necessary to press the shutter case 5 each time. This can be done directly from the bracket 5a without opening it, which is convenient as it can significantly improve work efficiency. Note that there is no practical problem if the viewing window is normally closed with the lid 24.

[Operations and Effects] In summary, since the present invention is constructed as described above, the drive motor is built into the winding drum, and there is no need to provide an installation spout for the drive motor in the shutter case. Therefore, the shutter case can be made as light and compact as possible. Moreover, in this product, the counters for the upper and lower limit switches are installed on the spindle so that they can count the rotation of the winding drum, rather than the rotation of the drive motor as in the conventional case, so the counters can be installed inside the winding drum. Space can be used effectively for installation, there is no need to increase the diameter of the winding drum, and moreover, accurate and highly accurate counter detection can be performed. Furthermore, the reset button for this counter is also located inside the winding barrel and can be operated directly from the viewing window drilled into the bracket, so the upper and lower limit positions of the shutter curtain can be readjusted after the electric shutter is assembled. There is no need to open the shutter case each time, and adjustments can be made extremely easily and quickly.

[Brief explanation of the drawing]

The drawings show an embodiment of the winding shaft structure of an electric shutter according to the present invention, in which FIG. 1 is a schematic front view of the electric shutter, and FIG. 2 is a front view with a part of the winding shaft omitted. 3 is an enlarged sectional view of a main part, FIG. 4 is a sectional view taken along line AA in FIG. 3, and FIG. 5 is a sectional view taken along line BB in FIG. In the figure, 1 is the shutter curtain, 2 is the winding shaft,
3 is a guide rail, 5 is a shutter case, 5a
is the bracket, 5b is the viewing window, 6 and 6a are the support shafts,
7 is a drive motor, 8 is a drive gear, 9 is a driven gear,
10 is a winding drum, 11 is a bearing, 12 is an internal gear, 1
3 and 14 are bullets, 15 is a lead wire, 16 is a flange portion, 17 and 18 are limit switches, 19 and 2
0 is a counter, 19c, 20c are reset buttons, 2
1 is a pin shaft, 22 is a tension bullet, and 23 is an inner flange.

Claims (1)

[Scope of utility model registration request] A drive motor attached to a support shaft fixed to the bracket of the shutter case is installed inside the winding drum for winding the shutter curtain, which is rotatably supported on the support shaft, and the drive motor and winding drum are driven. The winding drum is rotated by the drive of the motor and is interlocked and connected to raise and lower the shutter curtain to form a winding shaft. A counter for opening and closing a lower limit switch is provided, and the counter is interlocked and connected to the winding drum so as to count in response to rotation of the winding drum,
The winding shaft structure for an electric shutter is further characterized in that reset buttons for both counters are disposed within the winding drum at a position where they can be operated from a viewing window bored in the bracket.