JPH056396Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is mainly aimed at the position where the curtain of the electric shutter is unwound and fully closed (referred to as the lower limit).
The present invention relates to a limit mechanism for an electric shutter that automatically stops the operation of an electric motor for driving the shutter.

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

However, the limit mechanism of a conventional electric shutter has a structure in which the electric current to the motor is stopped based on the sensitive opening and closing operations of a lower limit switch and an upper limit switch, each of which operates automatically.

(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.Furthermore, loose wiring is required for the lower limit switch, so In addition to complicating the wiring structure, there was a problem in that it placed an unnecessary load on the shutter opening/closing mechanism.

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, in the configuration of the present invention, a motor 2 is fixedly installed in the middle of the fixed shaft 1 of the shutter curtain, and the tip of the output shaft of the motor 2 is drive gear 10, and internal gear wheels 14, 1 rotatably attached to the outer periphery of the fixed shaft 1.
5, internal gears 14 and 15 with which the driving gear 8 meshes and which wind up the shutter curtain on the outer peripheral wall thereof; and a sleeve 21 fixed in parallel to the stationary shaft 1. , same sleeve 2
A screw shaft 22 is rotatably supported in a cantilever manner at the center of the inner hole of No. 1 and rotates together with a transmission tooth wheel 29 that meshes with the internal teeth of the internal tooth wheels 14 and 15.
The sleeve 21 is externally fitted and screwed onto the same threaded shaft 22.
This is a shutter opening/closing limit mechanism formed with an inner threaded cylinder 23 that slides in a stroke, the inner threaded cylinder 23 being provided so as to removably protrude from the outer circumferential surface of the sleeve 21, and having a head that is connected to the outer circumferential surface of the sleeve 21. A set screw 28 for preventing rotation protrudes from a long hole 21b formed in the axial direction, and one and the other limit stoppers 21a, 24 protruding from the inner circumferential wall surface of one end and the other end of the sleeve 21, respectively. and an abutment surface that is formed protrudingly on the outer circumferential surface or end surface of the internally threaded cylinder 23 and that comes into contact with the limit stopper.

(Function) Due to this structure, in the limit mechanism of the present invention, the shutter drive motor is a known automatic stop motor with tachodynamics, that is, a motor that automatically stops energization when an overload is detected. When used, for example, at the lower limit where the shutter curtain is closed, the draining part at the lower end of the shutter curtain reaches the lower surface of the opening, and at the same time, the abutment surface of the internal threaded tube 23 hits the other limit stopper 23 of the sleeve 21. This will cause an overload, and at the upper limit, the drain section will hit the lintel, causing an overload condition.
No matter which limit is reached, power to the motor is automatically stopped.

In addition, in order to adjust the upper limit up or down, after unscrewing the set screw 28 for rotation, rotate the internal threaded cylinder 23 by hand so that the abutting surface of the internal threaded cylinder 23 is aligned with the other side. After adjusting the timing of contact with the stopper 24, the tip of the set screw 28 may be screwed into the outer circumferential surface of the internally threaded tube 23 through the elongated hole 21b.

(Example) Hereinafter, the configuration of the present invention will be specifically described based on an example shown in FIGS. 1 to 3.

In the limit mechanism of the embodiment, an electric motor 2 for opening/closing drive is fixedly installed in the middle of a fixed shaft 1 which is horizontally fixed in a shutter case, and this motor 2 is connected to a leg 3 of the motor case.
The fixed shaft 1 is sandwiched between the fixed shaft 1 and the clamp 4, and is fastened and fixed by a fastening bolt 5. The motor 2 is a known automatic stop type geared motor, that is, one side of the motor 2 for,
For example, the rotational speed detector 6 such as a tacho generator, pulse generator, rotary encoder, etc. is integrated, and the detection signal is transmitted to the motor 2.
is input to the energization control circuit for motor 2.
When the motor becomes overloaded, it opens the current circuit to the motor.

In addition, a substantially semicircular support plate 7 formed below the end plate 2a of the motor case having a substantially semicircular shape is fastened and fixed by fastening bolts 8.

Next, a drive gear (sprocket in the figure) 10 is supported at the tip of the output shaft 9 of the motor 2, and the rotation of the output shaft 9 is transmitted to the drive gear 10 via a shock absorber 11. being communicated.

On the other hand, each of the pair of bearings 12 installed on the left and right sides of the support plate 7 has a driven tooth wheel 13 for guiding, respectively.
The shaft is supported.

Furthermore, internal tooth wheels 14 and 15 formed in two are meshed around these three wheels, that is, the drive tooth wheel 10 and both driven tooth wheels 13, and these internal tooth wheels mesh with each other. The left and right ears of the rings 14 and 15 are connected to the fastening bolt 1.
They are joined by 6.

Thus, the teeth of each tooth ring 10, 13 mesh with a large number of toothed pins 17 implanted on the circumferential line near the outer periphery of the internal tooth wheels 14, 15. is guided by each gear wheel 10, 13 and held so as to rotate freely.

In addition, the ears on one side of the internal tooth wheels 14 and 15 are
The slat receiver 18 having a U-shaped cross section is connected to the fastening bolt 1.
The slat receiver 18 has a screw hole 18a drilled in the side surface thereof to which a slat at the base end of the curtain is attached.

Next, a limit actuator 20 is fixed and installed at the lower end of the support plate 7 with left and right fastening bolts 19. a screw shaft 22 that is rotated in the inner hole of the sleeve 21
and an internally threaded cylinder 23 that is externally fitted onto the threaded portion 22b of the same threaded shaft 22 and moves through the stroke.

First, the sleeve 21 has an inner flange 21 that forms one limit stop at a central location of the inner hole.
a is formed in a protruding manner, and on the periphery of the opening end on one side there is provided a limit stopper 2 which constitutes the other limit stopper and is made of a ring plate with a folded cross-sectional shape.
4 is fixed by a screw 25, and a long hole 2 for preventing rotation is provided at one location on the outer circumferential surface of the 4.
1b is perforated.

Next, the screw shaft 22 has a cylindrical boss portion 22a near the center, a shaft portion 22b projecting from the boss portion 22a to the right in the drawing, and a threaded portion 22c projecting from the boss portion 22a to the left in the drawing. The boss portion 22a is supported via a bearing 26 on the right side of the inner flange 21a of the inner hole of the sleeve 21.

Further, the internal threaded cylinder 23 has a knob part 23a for adjustment operation forming the left half of the drawing, an internal threaded part 23b forming the right half of the drawing, and a projection at one location on the outer peripheral surface of the internal threaded part 23b. The outer collar 2 is provided to form an abutting surface.
3c, and the internal threaded cylinder 23 is
The inner threaded part 23 is connected to the threaded part 22c of the threaded shaft 22.
It is screwed together.

Note that a knurled hole is formed on the outer peripheral surface of the knob portion 23a to prevent the hand from slipping.

Furthermore, the inner threaded portion 23b, the outer peripheral surface, and the sleeve 21
A cylindrical collar 27 is loosely inserted between the inner peripheral surface of the collar 27 and a rotation stopper inserted through the elongated hole 21a at one location on the circumference of the collar 27. The setscrews 28 are screwed together and abutted inwardly.

Note that the end surface of the internal threaded portion 23b is connected to the abutment surface 23d.
has been achieved.

By the way, a transmission gear 29 is pivotally attached to the shaft portion 22b of the screw shaft 22 of the limit actuator 20 formed in this way, and the transmission gear 29 is
Tooth type pin 1 at the bottom of the internal tooth wheels 14 and 15 mentioned above
7, and the shaft portion 22b and the transmission gear 2
9 is coupled to prevent rotation by keyway coupling.

Next, the handling and operation of the limit mechanism of the embodiment configured as described above will be described. When this mechanism is assembled to the shutter, the base end of the curtain slat is bolted into the screw hole 18a of the slat receiver 18. As a result, when the drive gear wheel 10 is rotated by the output shaft 9 of the motor 2, the internal gear wheels 14 and 15 are rotationally driven to wind in and unwind the curtain, and are interlocked with this. and transmission gear 2
9 is driven to rotate the screw shaft 22, and as a result, the internal threaded cylinder 23, which is fixed to the sleeve 21 by the set screw 28, moves in a sliding stroke within the sleeve 21.

By the way, Figures 1 and 3 show the state when the curtain is at the lower limit, that is, the state when the draining part is in contact with the floor of the shutter and the weight of the curtain is firmly supported by the floor. In this state, the outer abutting surface of the outer flange 23c of the inner threaded cylinder 23 is in contact with the limit stopper 24.

However, when the motor 2 is started to rotate in the direction of opening the door from the levered state, the internal gear wheels 14 and 15 are rotated in the direction of winding up the curtain, and at the same time, the internal threaded cylinder 23 is slid to the right in the drawing. move it.

Then, when the curtain reaches its upper limit,
The inner threaded cylinder 23 has an abutting surface 23d that is connected to the sleeve 2.
As the curtain moves to a position close to the inner brim 21a of the shutter case, the draining part of the curtain hits the lintel part of the shutter case, so the motor 2 automatically stops based on the above-mentioned characteristics of the motor 2.

Next, when the motor 2 is started to rotate in the direction of closing the door from this door open state, while rotating the internal gear wheels 14 and 15 in the direction of lowering the curtain,
When the inner threaded cylinder 23 is slid to the left in the drawing and finally reaches the lower limit, the outer flange 23c of the inner threaded cylinder 23 collides with the limit stopper 24, so that
Similarly, motor 2 automatically stops.

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

In addition, the structure of the above-described embodiment is composed only of mechanical parts, so there is no need for wiring, and the motor 2, its transmission mechanism, and limit actuator 20 all occupy the space around the fixed shaft 1. Since the limit mechanism is arranged using the limit mechanism, it does not take up any particular space for installation, and as a result, even in the case of a small electric shutter, the limit mechanism can be equipped without causing any hindrance to other devices.

In the configuration of the embodiment described above, the lower limit is controlled by the collision between the outer collar 23c and the limit stopper 24.
Instead, reverse the direction of rotation of the screw shaft 22, loosen the set screw 28, turn the knob of the inner threaded cylinder 23, and adjust the screwing position of the inner threaded cylinder 23. As shown in FIG. 4, the lower limit may be controlled by the abutting surface 23a of the inner threaded cylinder 23 and the inner flange 21a of the sleeve 21. It is also possible to control the lower limit at one stroke end and the upper limit at the other stroke end by matching the stroke size of the threaded cylinder 23 with the height of the curtain's elevation.

(Effect of the invention) As described above, according to the limit mechanism of the electric shutter according to the invention, the electric motor and the limit actuator are fixed and installed in the middle of the fixed shaft, and the electric motor and the limit actuator are fixed and installed in the sleeve of the limit actuator. The simple structure of simply screwing together the threaded shaft and the inner threaded cylinder provides a limit mechanism that is compact and does not adversely affect the opening/closing mechanism of the shutter. This has the effect of improving performance and practicality.

Also, after unscrewing the locking screw 28,
Rotate the internal threaded cylinder 23 by hand, for example, rotate the internal threaded cylinder 23 by hand.
After adjusting the timing at which the abutting surface of the slat curtain hits the other stopper 24, the tip of the set screw 28 is screwed into the outer peripheral surface of the internally threaded tube 23 through the elongated hole 21b. This has the effect that the lower limit position for stopping the energization can be easily adjusted.

Also, after unscrewing the locking screw 28,
Rotate the internal threaded cylinder 23 by hand, for example, rotate the internal threaded cylinder 23 by hand.
After adjusting the timing at which the abutment surface of the slat curtain hits the other stopper 24, the tip of the set screw 28 is screwed into the outer peripheral surface of the internally threaded tube 23 through the elongated hole 21b. This has the effect that the lower limit position for stopping the energization can be easily adjusted.

[Brief explanation of the drawing]

Fig. 1 is a side view of a limit mechanism of an electric shutter showing an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a partial bottom view taken along the - line in Fig. 1, and Fig. 4. is another operational view of FIG. 3. 1...Fixed shaft, 2...Electric motor, 21
...Sleeve, 21a, 24...Inner collar forming one and the other limit stopper, and Limit stopper 10, 22...Threaded shaft, 23...Inner threaded cylinder, 23c, 23d...Outer collar forming abutting surface,
and abutment surface, 28... set screw for rotation stop, 29
...Transmission gear.

Claims (1)

[Claims for Utility Model Registration] A motor 2 fixedly installed in the middle of the fixed shaft 1 of the shutter curtain, a drive gear 10 at the tip of the output shaft of the motor 2, and a rotatable motor 2 on the outer periphery of the fixed shaft 1. Internal tooth ring 14,1 attached to
5, internal gears 14, 15 with which the drive gear 8 meshes and which wind up the shutter curtain on the outer peripheral wall thereof, and a sleeve 21 fixed parallel to the stationary shaft 1. , same sleeve 2
A screw shaft 22 is rotatably supported in a cantilevered manner at the center of the inner hole of No. 1 and rotates together with a transmission gear wheel 29 that meshes with the internal teeth of the internal tooth wheels 14 and 15.
The sleeve 21 is externally fitted and screwed onto the same threaded shaft 22.
This is a shutter opening/closing limit mechanism formed with an inner threaded cylinder 23 that slides in a stroke, the inner threaded cylinder 23 being provided so as to removably protrude from the outer circumferential surface of the sleeve 21, and having a head that extends from the outer circumferential surface of the sleeve 21. A set screw 28 for preventing rotation protrudes from a long hole 21b formed in the axial direction, and one and the other limit stoppers 21a, 24 protruding from the inner circumferential wall surface of one end and the other end of the sleeve 21, respectively. A limit mechanism for an electric shutter, characterized in that it has: and an abutment surface that is formed protrudingly on the outer circumferential surface or end surface of the internally threaded cylinder 23 and that comes into contact with the limit stopper.