JPH056397Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a limit mechanism for electric shutters, and in particular, to automatically stop the drive electric motor at the final stage of opening and closing of electric shutters equipped with a built-in opening/closing mechanism. This relates to a limit mechanism for

(Prior art) In the structure of a conventional limit mechanism in a built-in shutter opening/closing machine installed inside the shutter case, the limit mechanism is fixed parallel to the side of a fixed shaft for winding slats. A sleeve, a screw shaft that is rotatably cantilever-supported on the shaft center of the sleeve and rotates in conjunction with the opening and closing movement of the shutter, and a screw shaft that is externally fitted and screwed onto the dynamic screw shaft and inserted into the sleeve. The structure includes an internally threaded cylinder that slides through a stroke, and a means for preventing the internally threaded cylinder from rotating around the sleeve.

(Problem to be Solved by the Invention) However, the conventional means for preventing the internal threaded cylinder from rotating in the sleeve does not include attaching the internal threaded cylinder via a set screw that slides in the guide hole of the sleeve. A structural method that prevents rotation is used, but this method not only complicates the structure, but also makes it troublesome to attach and remove the set screw, and the set screw is easily clogged, which reduces the ease of handling and reliability of the limit mechanism. The problem was that it lacked sex.

Therefore, the present invention has a simple structure and operation, and
Another object of the present invention is to provide a limit mechanism for an electric shutter that has excellent operational reliability.

(Means for solving the problem) In order to achieve the purpose, in the configuration of the present invention, a sleeve is fixed in parallel to the fixed shaft, and a cantilevered shaft is rotatably mounted on the axis of the sleeve. A shutter opening/closing limit consisting of a screw shaft that is supported by a bearing and rotates in conjunction with the opening/closing movement of the shutter, and an inner threaded tube that is externally fitted and threaded onto the screw shaft and slides in a stroke inside the sleeve. The mechanism includes a longitudinal insertion hole drilled in the axial direction on the circumferential surface of the sleeve, a plurality of rows of spline grooves drilled in the axial direction on the outer circumferential surface of the internal threaded cylinder, a contact plate and an engaging fin. and a rotation-preventing cap having a T-shaped cross section and an engaging fin that passes through the insertion hole and is fitted into one of the spline grooves. It has a structure that is

(Function) Because of this structure, the limit mechanism of the present invention has a simple structure of simply inserting the rotation prevention cap into the insertion hole of the sleeve.
The cap is easy to attach and detach, and the long engagement fins prevent rotation, and since there are no moving parts, the cap can be prevented from rotating smoothly and reliably.

(Example) Hereinafter, the configuration of the present invention will be specifically described based on an example shown in FIGS. 1 to 8.

The built-in type opening and closing machine to which the limit mechanism of the embodiment is attached comprises an automatic stop type geared motor 2 installed above a fixed shaft 1 for winding up a stationary slat,
The motor 2 includes a support plate 4 split into upper and lower parts fixed to the end surface of a motor case 3, a pair of driven teeth 5 journaled in bearings 4b on the left and right sides of the lower plate 4a, a limit mechanism 6 of the embodiment fixed to the bottom of the lower plate 4a, and a bearing 4b at the bottom of the lower plate 4a.
The opening and closing machine is formed by a transmission gear 7 journaled in the shaft 1c, a driving gear 8 (details will be described later), and a half internal tooth wheel 16 which is fitted and meshed with the four gears 5, 5, 7, 8. The opening and closing machine is also provided with a control box 10 installed around the fixed shaft 1.
and a radio receiver 11 for receiving remote command signals.
and is included.

The automatic stop geared motor 2 includes an electric motor 12 for opening/closing drive, and a brake 1 on the motor shaft.
3, a generator 14 for detecting the rotational speed of the motor shaft, and a reduction gear 15 for the motor output shaft.
7 and a clamp bolt 18 to the fixed shaft 1.

Next, in the support face plate 4, an upper face plate 4d and a lower face plate 4a are integrally fastened by left and right reamer bolts 19, and left and right sides of the upper face plate 4d are connected to the motor case 4 by fastening bolts 20. is fixed.

Further, the output shaft 21 of the geared motor 2 is rotatably coupled to a drive gear 8 via a shock absorber 22, and the drive gear 8 is secured to the tip of the output shaft 21 by a snap ring 23. It is prevented from coming off by a roller 24.

Next, the internal toothed wheel 16 has a pair of symmetrical wheel half portions 16a and 16b that are connected to the respective ear bosses 1.
6c and 16d are integrated by a reamer bolt 25 that fastens them together, and a fastening screw 27 that fastens the slat board 26 is provided on one side of the ear boss 16d.
A screw hole 28 is bored therein.

Note that the drive gear 8 meshes with the top of the inner teeth 16e (see FIG. 2) of the inner gear 16, and
The driven tooth wheel 5 and the transmission tooth wheel 7, which are held between the spacer roller 30 and the retaining roller 32 which is secured to the tooth wheel shaft 29 by a snap spring 31, are attached to the left and right sides and bottom of the internal teeth 16e, respectively. Thereby, the internal toothed wheel 16 rotates without an axis.

In addition, the above-mentioned retaining rollers 24, 32 and 40
is in contact with the smooth surface 16f on the inner periphery of the internally toothed wheel 16, and prevents the internally toothed wheel 16 from wobbling in the diametrical direction.

Next, the limit mechanism 6 of the embodiment includes a sleeve 34 fixed to the lower face plate with a fastening bolt 33, and an interlocking rotating shaft 35 that is locked to the transmission gear 7 with a key.
and a screw shaft 36 integrally connected to the rotating shaft 35.
and an internally threaded cylinder 37 that fits externally and meshes with the same threaded shaft 36.
The transmission gear 7 is sandwiched between a spacer roller 38 between the bearing 4c and a retaining roller 40 that is locked to the interlocking rotating shaft 35 by a snap spring 39.

Note that the limit mechanism is provided with a separate cap 41 for preventing rotation, which will be described later.

By the way, on the outer peripheral surface of the internally threaded cylinder 37, there are a plurality of rows (six rows in the illustration) of spline grooves 3 in the axial direction.
In addition to the holes 7a drilled therein, there is an insertion hole 34 formed of a long hole in one place on the circumferential surface of the sleeve 34 in the axial direction.
a is perforated.

However, a cap 41 having a T-shaped cross section is removably inserted into the insertion hole 34a of the lever, and this cap 41 has a contact plate 4 made of a longitudinal arc plate.
1a and an engagement fin 41b that fits into the spline groove 37a described above are integrally formed.

With this structure, the internal threaded cylinder 37 is reliably prevented from rotating by selectively engaging the spline groove 37a with the cap 41.

Here, the operation of the built-in switch constructed as described above will be explained.

First, the drawing shows the state when the shutter door is opened. In this state, when the transmitter for the open/close command signal for wireless operation of the shutter is operated to command the door to close, the receiver 1
A command signal from 1 is input to the control box 10 to start the electric motor 12 in the door closing direction.

This startup causes the motor output shaft 21 and the drive gear 8 to
rotates in the door closing direction to drive the internally toothed wheel 16, thereby rotating the slat base plate 26 assembled to the wheel 16 in the feeding direction, and the slat begins to descend.

However, during levering, the transmission gear 7 is driven as the internal toothed wheel 16 rotates, causing the interlocking rotating shaft 35 and the screw shaft 36 to rotate. Enter and move.

Finally, when the lower end of the slat reaches the floor surface, the inner end of the internally threaded cylinder 37 hits the inner end of the sleeve 34, so that the electric motor 12 becomes unloaded and automatically stops.

On the other hand, when the door opening command is operated, the slat rises in the same manner, and as a result, the internal threaded cylinder 37 slides in the direction of protruding from the sleeve 34.
Finally, when the drainage part of the slat hits the magnifying part of the shutter case, the motor 12 becomes overloaded, and the electric motor 12 is thereby automatically stopped.

In the limit mechanism 6 of this embodiment, the cap 41 is inserted into the insertion hole 34a of the sleeve 34.
The internal thread cylinder 37 has a simple structure and operation just by inserting it into the
In addition to being able to prevent the rotation of the engaging fin 4,
Since the fin 1b is long in the axial direction, it can be reliably prevented from rotating, and since the internal threaded cylinder 37 has multiple rows of spline grooves 37a, the spline into which the engagement fin 41b is fitted can be prevented. Groove 3
By selecting 7a, it is possible to modify the sliding position of the internal threaded cylinder 37 and easily adjust the limit position.

If there is a risk that the cap 41 may come off, a metal band may be stretched around the outer periphery of the sleeve 34 from above the cap 41.

(Effects of the invention) As described above, according to the electric shutter limit mechanism according to the invention, the insertion hole 34a is bored in the circumferential surface of the sleeve 34, and the inner threaded cylinder 37
A plurality of rows of spline grooves 37a are formed on the outer peripheral surface of the T-shaped cap 41, and the engagement fins 41b of the T-shaped cap 41 inserted into the insertion hole 34a are inserted into the spline groove 3.
7a, the internal threaded cylinder 37 can be easily and easily stopped and released, and can be reliably prevented from rotating. This improves the operability and reliability of the limit mechanism. It has the effect of improving

In addition, since a plurality of rows of spline grooves 37a are formed in the internal threaded cylinder 37, when adjusting the limit position, the internal threaded cylinder 37 can be rotated by hand to form the spline into which the engaging fin 41b is fitted. Groove 3
By selecting 7a, the sliding position of the internal threaded cylinder 37 can be corrected and the limit position can be easily adjusted.

[Brief explanation of the drawing]

Fig. 1 is a front view of a limit mechanism of an electric shutter showing an embodiment of the present invention, Fig. 2 is a side sectional view taken along the - line in Fig. 1, and Fig. 3 shows the main parts of Fig. 1. The cross section, FIG. 4 is a front sectional view taken along the - line in FIG. 2, and FIGS.
- line, - line, - line and - in the diagram
FIG. 1...Fixed shaft, 34...Sleeve, 34
a...Insertion hole, 36...Threaded shaft, 37...Inner threaded cylinder, 37a...Spline groove, 41...Cap, 41a...Block plate, 41b...Engaging fin.

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 wheel 8 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. An internal toothed wheel 16 is attached to the fixed shaft 1, and the driving toothed wheel 8 meshes with the internal teeth of the internal toothed wheel 16, and the internal toothed wheel 16 winds up the shutter curtain on its outer peripheral wall. The sleeve 34 is fixed, and the sleeve 34 is rotatably supported in a cantilevered manner at the center of the inner hole of the sleeve 34, and rotates together with the toothed wheel 7 that meshes with the internal teeth of the internally toothed wheel 16. This shutter opening/closing limit mechanism is formed with a threaded shaft 36 and an internally threaded cylinder 37 that is externally fitted and screwed onto the threaded shaft 36 and slides in a stroke inside the sleeve 34, the axis of the circumferential surface of the sleeve 34 being formed. A longitudinal insertion hole 34a drilled in the direction, a plurality of rows of spline grooves 37a drilled in the axial direction on the outer circumferential surface of the internal threaded cylinder 37, a contact plate 41a and an engaging fin 41b have a cross section T. It is a cap 41 for preventing rotation formed by connecting in a letter shape, and its engagement fin 41b is connected to the insertion hole 3.
4a and the spline groove 3 at one location.
A limit mechanism for an electric shutter, comprising a cap 41 fitted into the cap 7a.