JPH056395Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is mainly based on automatically stopping the operation of the electric motor for driving the curtain when the curtain of the electric shutter is lowered and fully closed (referred to as the lower limit). The present invention relates to a limit mechanism for an electric shutter.

(Prior Art) In the general configuration of an electric shutter, a limit mechanism is attached to the energizing circuit for the electric motor for driving the shutter (hereinafter simply referred to as the motor), and when the shutter is opened or closed, a lower limit and an upper limit are set. In this case, the power to the motor is automatically stopped.

However, the limit mechanism of a conventional electric shutter has a structure in which the power supply to the motor is stopped based on the operation of a lower limit switch and an upper limit switch.

(The problem that the invention attempts to solve) However, according to this conventional structural method,
Since space is required to install each limit switch, in the case of small window shutters, the limit mechanism becomes bulky and gets in the way, and loose wiring is required for the lower limit switch. There was a problem that the wiring structure became complicated.

Therefore, an object of the present invention is to provide a limit mechanism for an electric shutter that has a compact structure that does not require wiring and does not take up any special space for installation.

(Means for Solving the Problems) In order to achieve the purpose, the limit mechanism of the electric shutter of the present invention uses a shutter drive motor 2 fixedly installed at an intermediate position of the fixed shaft 1 of the shutter curtain, and the same A driving toothed wheel 9 at the tip of the output shaft of the electric motor 2, and an internally toothed toothed wheel 13 rotatably attached to the outer periphery of the fixed shaft 1.
an internally toothed toothed ring 13 that meshes with each other and winds up a shutter curtain on its outer peripheral wall;
A drive rod 16 protruding from the side surface of the outer circumferential wall of the fixed shaft 1 in parallel with the fixed shaft 1, an external threaded cylinder 18 externally fixed to the middle of the fixed shaft 1, and an externally fitted screw into the external threaded cylinder 18. A rotary movable plate 23 that is capable of reciprocating stroke movement in a state in which the drive rod 16 is inserted into a through hole 23a formed in the wall thereof in the axial direction; It is characterized in that a limit abutment body 19 that abuts against the plate 23 is formed.

(Function) Due to this structure, the limit mechanism of the present invention uses a known auto-stop motor with a tachogenerator, that is, a motor that automatically stops when an overload is detected, as the electric motor for driving the shutter. For example, at the lower limit, the rotary plate hits the limit abutment, resulting in an overload condition, and at the upper limit, the drain portion hits the lintel, causing an overload condition.
In either limit, the motor stops.

(Example) Hereinafter, the configuration of the present invention will be specifically described based on an example shown in FIGS. 1 and 2.

In the limit mechanism of the embodiment, an electric motor 2 for opening/closing drive is fixed and installed in the middle of a fixed shaft 1 which is horizontally fixed in a shutter case. The fixed shaft 1 is sandwiched between the fixed shaft 1 and the clamp 4, and is tightened and fixed by the fastening bolt 5, and a U-shaped cutout for insertion is bored in the end plate 2a of the motor case. Disk-shaped support plate 6
is fastened and fixed by a fastening bolt 7.

The motor 2 is a known automatic stop type geared motor, that is, a rotational speed detector (for example, a tacho generator, a pulse generator, a rotary encoder, etc.) is integrated into the motor 2 on the same axis. At the same time, the detection signal is input to the energization control circuit for the motor 2, and thereby,
When the motor 2 becomes overloaded, the current supply circuit is opened and the motor 2 is automatically stopped.

Next, a drive gear (sprocket in the figure) 9 is supported at the tip of the output shaft 8 of the motor 2, and the rotation of the output shaft 8 is controlled by a shock absorber 1.
0 to the drive gear 9, and on the other hand,
Bearings 11 are implanted at two positions on the peripheral edge of the support plate 6 at a distance of 120° from the output shaft 8, and the shafts of driven gear wheels (sprockets) 12 for guiding are respectively supported.

Further, an internal tooth wheel 13 formed in two halves is engaged with the three wheels, the drive tooth wheel 9 and the two driven tooth wheels 12, surrounding the three wheels. The internal tooth ring 13 is formed by a pair of opposing rings 13a and a tooth-shaped pin 13b provided on the circumferential line of the ring 13a at a tooth-shaped pitch. A pair of box-shaped retainers 14 are provided on both sides between the two halves.
It is connected to a single ring body by a series of fastening bolts 15.

The base of a drive rod 16 extending in the axial direction is attached and fixed to each retainer 14, and the outer end surface of the retainer 14 has a mounting hole 14a into which a slat at the base end of the curtain is locked. is perforated.

The output transmission mechanism of the motor 2 is formed in this way, so that when the motor 2 rotates, it is driven by the drive toothed wheel 9, and the shaftless internal teeth are rotationally guided by the three toothed wheels 9 and 12. The wheel 13 rotates, so that
At the same time as the retainer 14 rotates to drive the slat curtain to be rolled up (or lowered), the drive rod 16 is rotated in conjunction with this rotation.

By the way, a cylindrical shaft 17 formed in two is pivotally attached to the side of the internal toothed ring 13 of the fixed shaft 1, and this cylindrical shaft 17 is connected to an external threaded cylinder 18 and a boss-shaped limit. The cylindrical shaft 17 is joined in half by a pair of left and right fastening bolts 20, and is temporarily fixed to the fixed shaft 1. , are integrally fixed to the fixed shaft 1 by fixing screws 21.

Finally, on the screw 18a of the externally threaded cylinder 18, a rotatable plate 23 in the shape of a lug nut, which is molded in half and is connected as one piece by upper and lower fastening bolts 22, is externally fitted and screwed. In addition, through-holes 23a are bored in each of the left and right ears of the rotationally movable plate 23, and each drive rod 16 extending from the retainer 14 is inserted into the through-hole 23a. As a result, the rotationally movable plate 23 is driven by both drive rods 16, and slides along the axis while rotating on the circumferential surface of the externally threaded cylinder 18 in unison with the rotation of the retainer 14.

Next, the operation of the limit mechanism of the embodiment configured as described above will be described.

First, Fig. 1 shows the state when the curtain is at the lower limit, that is, when the draining part is in contact with the floor surface and the weight of the curtain is firmly supported by the floor surface. Now, the rotary moving plate 23
is in a moving position where its side faces abut against the abutment body 19.

From this state, when the motor 2 is started to rotate in the direction of opening the door, the retainer 14 is rotated in the direction of winding up the slat curtain, and at the same time, the rotary moving plate 23 is rotated and slid in the direction away from the abutment body 19. move it.

When the curtain reaches the upper limit position, the rotary plate 23 moves to near the tip of the screw 18a of the external threaded tube 18, and the drain part of the curtain abuts against the lintel part of the shutter case. automatically stops based on the above-mentioned characteristic of stopping when an overload condition occurs (see lines 3 to 11 on page 5).

Further, when the motor 2 is then started to rotate in the direction of closing the door, the retainer 14 is rotated in the direction of unwinding the slat curtain, and the rotary moving plate 23 is rotated and slid in the direction of approaching the abutment body 19, and finally When the lower limit is reached, the rotary moving plate 23 collides with the abutment body 19 and the motor 2 similarly stops automatically.

However, at the lower limit of the lever, the weight of the curtain is reliably supported on the floor surface, so no unnecessary stress is generated in the opening/closing mechanism.

In addition, in the structure of the above-described embodiment, since it is composed only of mechanical parts, there is no need for wiring, and the motor 2 and each component are arranged using the space around the fixed shaft 1. Therefore, it does not take up any particular space for installation, so even in the case of a small electric shutter,
A limit mechanism can be attached without any other problems.

The limit mechanism of the present invention can be applied not only to the lower limit but also to the upper limit.

(Effects of the invention) As described above, according to the limit mechanism of the electric shutter according to the invention, the rotationally movable plate 23 is externally fitted onto the externally threaded cylinder 18 fixed to the fixed shaft 1.
The limit mechanism is configured with a simple structure of just screwing together, and when the rotary moving plate 23 moves to the limit position via the interlocking mechanism by driving the electric motor 2 for opening and closing the shutter curtain, the electric motor 2 is forced to move. Since it is made to stop at , it is compact and
In addition, a limit mechanism that does not interfere with the opening/closing mechanism is obtained, thereby improving the equipment and practicality of the limit mechanism, and making it possible to stop the shutter curtain opened and closed by the electric motor 2 at the upper or lower limit position. It has the effect of ensuring that it works.

[Brief explanation of drawings]

FIG. 1 is a side view of a limit mechanism for an electric shutter showing an embodiment of the present invention, and FIG. 2 is a front view thereof. 1...Fixed shaft, 2...Electric motor, 18
. . . External threaded tube, 19 . . . Collating body, 23 . . . Rotating moving plate.

Claims (1)

[Scope of utility model registration request] Shutter drive electric motor 2 fixedly installed in the middle of the fixed shaft 1 of the shutter curtain
and the drive gear 9 at the tip of the output shaft of the electric motor 2.
and an internal toothed ring 13 rotatably attached to the outer periphery of the fixed shaft 1, with which the driving toothed ring 9 meshes, and an internal toothed ring which winds up the shutter curtain on its outer peripheral wall. A toothed ring 13, a drive rod 16 protruding from the side surface of the outer peripheral wall of the internally toothed toothed ring 13 in parallel with the fixed shaft 1, and an external threaded cylinder 18 externally fixed to a midway point of the fixed shaft 1. and,
The drive rod 16 is inserted into a through hole 23a formed in the wall of a rotary moving plate 23 which can be moved in a reciprocating stroke while being externally screwed into the externally threaded cylinder 18. A rotationally movable plate 23 and a limit abutting body 19 that abuts against the rotationally movable plate 23
A limit mechanism for an electric shutter, characterized in that a limit mechanism is formed.