JPH0119512B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a shutter drive device, and more particularly to a shutter drive device in which a take-up shaft for winding a shutter and a drive shaft for driving the take-up shaft when the shutter is opened are provided separately. It is related to the device.

Prior Art Conventionally, in order to smoothly wind the shutter, a shutter is provided with a winding shaft for winding the shutter and a drive shaft for driving the winding shaft when the shutter is opened, which are separately provided. Some are shown in the official gazette.

The shutter shown in Japanese Utility Model Publication No. 52-55867 has a winding shaft that is pivotally supported by a shaft in a storage box of the shutter, a shutter that is attached to the winding shaft, and a shutter that is arranged parallel to the winding shaft. a drive shaft having a feed ring that meshes with the shutter when the shaft is opened and closed; a sprocket fixed to the shaft and the drive shaft respectively; a chain suspended between both sprockets; The winding device includes a spring whose end is attached to the winding shaft and biases the winding shaft in the winding direction.

When the shutter is opened, the winding shaft rotates via the drive shaft, chain, shaft, and spring to wind up the shutter. At this time, as the shutter is wound onto the take-up shaft, its take-up diameter increases, and the amount of rotation of the take-up shaft to wind up a certain length of shutter decreases; The difference between the amount of rotation and the amount of rotation of the take-up shaft is absorbed by the spring, and the spring also biases the shutter in the winding direction, so that the shutter is wound onto the take-up shaft without loosening.

However, in such a shutter, when the shutter is closed, it is necessary to rotate the drive shaft against the biasing force of the spring, so in large shutters that require the use of strong springs, the drive shaft must be rotated against the biasing force of the spring. A large amount of force was required to rotate against the biasing force.

Purpose An object of the present invention is to provide a drive device that can open a shutter without loosening the shutter and does not require a large force when closing the shutter.

Structure of the invention The structure of this invention is provided in a storage box,
A take-up shaft that winds the shutter, a drive shaft that is arranged parallel to the take-up shaft and that sends the shutter in the opening direction when the shutter is opened, and a drive shaft that is arranged between the take-up shaft and the drive shaft and that is A friction clutch having two clutch members, a driving side clutch member connected to the winding shaft and a winding side clutch member connected to the winding shaft, in which the driving side clutch member has a torque of less than a predetermined value when the shutter is released. When the drive side clutch member and the take-up side clutch member contact each other and rotate as a unit, when the drive side clutch member rotates with a torque exceeding a predetermined value, the take-up side clutch member contacts the drive side clutch member. The friction clutch is configured to rotate in contact with the friction clutch while slipping against the friction clutch.

Embodiment Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
It is driven by a drive shaft 4 provided inside, and can be opened and closed horizontally along a guide rail 5. The drive shaft 4 is rotationally driven by a motor to be described later, and the winding shaft 6 rotatably supported in the center of the storage box 3 is connected to a chain 7 suspended between the drive shaft 4 and the winding shaft 6.
The shutter 2 is rotated as the drive shaft 4 rotates, and the shutter 2 can be wound or rewound.

As shown in FIG. 3, the shutter 2 is constructed by connecting multiple stages of slats 8. As shown in FIG. 4, the slat 8 has a hook portion 10 protruding from one end of the main body portion 9, and the hook portion 10 is inserted through a slit 11 provided at the other end of the main body portion 9 of the adjacent slat 8. The hook portion 10 is inserted into the main body portion 9 of the adjacent slat 8 so as to be retractable, that is, the adjacent slat 8 is connected to the main body portion 9 so that the adjacent slat 8 can be expanded and contracted. The hook part 10 is provided with elongated holes 12 at equal intervals, and when the slat 8 is extended as shown in FIGS. 3 and 4, lighting and ventilation can be carried out through the elongated holes 12. As shown, the shutter 2 is completely closed when the slat 8 is in the retracted state.

Next, to explain the structure of the drive shaft 4 and the winding shaft 6, as shown in FIGS. 6 and 8, the drive shaft 4 is connected to the output shaft 1 of the motor 13 fixed to the storage box 3.
One end thereof is connected to the storage box 3a, and the other end is rotatably supported by the storage box 3. A drive gear 14 is fitted and fixed near both ends of the drive shaft 4, and teeth 14a provided at equal intervals on the outer periphery of the drive gear 14 engage with the hook portion 10 of the slat 8 in an extended state. Therefore, when the motor 13 is operated and the drive shaft 4 is rotated, the slat 8 is moved in the left-right direction in FIG. The drive gear 14 is located between the elongated holes 12 of the hook portion 10 so that its teeth 14a do not fit into the elongated holes 12. A drive sprocket 15 is fitted and fixed to the other end of the drive shaft 4, and the chain 7 is hung thereon.

A driven sprocket 16 as a drive-side clutch member is provided at the other end of the winding shaft 6, and the chain 7 is hung thereon. This driven sprocket 16 transfers only rotational torque below a predetermined value to the winding shaft 6.
Clutch mechanism 1 as a friction clutch that transmits
It forms part of 7. The clutch mechanism 17
The detailed structure of the driven sprocket 16 will be explained with reference to FIGS. 10 and 11. The driven sprocket 16 is sandwiched on both sides by clutch discs 18 having a large friction coefficient, and the clutch body 1 as a winding side clutch member is
9 is rotatably fitted. clutch body 19
A flange portion 19a is formed at the base end, a drive shaft 20 is fitted into the center, and the base end of the drive shaft 20 is rotatably supported by the storage box 3. A screw is carved on the outer periphery of the tip of the clutch body 19, and as shown in FIG. ing. Therefore, the clutch body 19 and the drive shaft 20 are fitted together so that they cannot rotate relative to each other.

A disc spring 23 is fitted to the distal end of the clutch body 19 via a pressure plate 22, a nut 24 is screwed onto the outside of the disc spring 23, and the disc spring 23 is inserted between the nut 24 and the pressure plate 22. Compressed. Therefore, the driven sprocket 16 is pressed between the clutch disks 18 by the biasing force of the disc spring 23, and the proximal clutch disk 18 is pressed against the flange portion 19a of the clutch body 19. Note that the biasing force of the disc spring 23 can be adjusted by rotating the nut 24.

A bearing 25 is fitted to the other end of the winding shaft 6, and the tip of the drive shaft 20 is fitted into the bearing 25, so that the winding shaft 6 is rotatably supported by the drive shaft 20. In the winding shaft 6, an input shaft 27 of a roller clutch 26 is fitted to the tip of the drive shaft 20, and is fixed by a pin 28 so as not to be relatively rotatable. A case 29 of the roller clutch 26 is fixed to the winding shaft 6 with a screw 30. When the drive shaft 20 is rotated in the shutter winding direction, this roller clutch 26 transmits the rotational torque to the winding shaft 6, and when the drive shaft 20 is rotated in the shutter rewinding direction, the roller clutch 26 idles. Rotational torque is not transmitted to the winding shaft 6.

As shown in FIG. 6, a brake drum 31 is provided at one end of the winding shaft 6, and the brake drum 31 has one end fixed to the storage box 3 and the other end as shown in FIG. A belt 32 connected to the storage box 3 via a coil spring 33 is hung so that rotation of the winding shaft 6 due to inertia is braked by friction between the belt 32 and the drum 31.

Next, the operation of the shutter drive device configured as described above will be explained.

To open the fully closed shutter 2, when the drive shaft 4 is rotated in the direction of arrow A by the motor 13 in FIG. 2, each slat 8 is moved by the drive gear 14 in the shutter opening direction. At the same time, the winding shaft 6 is rotated in the same direction as the drive shaft 4 via the chain 7, so the drive shaft 4
The slats 8 transferred into the storage box 3 are sequentially wound around the winding shaft 6. Slut 8 on winding shaft 6
As it is wound up, its winding diameter increases and the amount of winding per revolution increases. It cannot rotate along with the drive shaft 4. At this time, idle rotation occurs between the driven sprocket 16 and the clutch body 19, and the excess rotation of the driven sprocket 16 rotated from the drive shaft 4 via the chain 7 is absorbed by the clutch mechanism 17. Therefore, the slat 8 between the drive shaft 4 and the take-up shaft 6 is kept under constant tension and is wound around the take-up shaft 6 one after another.

Now, when closing the opened shutter 2, when the drive shaft 4 is rotated by the motor 13 in the opposite direction to the arrow A, the slat 8 is rewound from the take-up shaft 6 by the drive gear 14. At this time,
As the drive shaft 4 rotates, the drive shaft 20 is also rotated via the chain 7 and the clutch mechanism 17, but since the slat is in the unwinding direction, the roller clutch 26 idles, and the rotation of the drive shaft 20 is caused by the winding. It is not transmitted to the shaft 6. Therefore, the slat 8 is sequentially unwound from the take-up shaft 6 by the rotation of the drive shaft 4 and by the rotational torque of the drive gear 14, regardless of the operation of the chain 7 and clutch mechanism 17.

When the drive shaft 4 is stopped when the shutter 2 is closed in this manner, the take-up shaft 6 tries to rotate due to inertia, but the belt 32 is hung around the brake drum 31 at one end of the take-up shaft 6. Therefore, the friction prevents the winding shaft 6 from rotating due to inertia. Therefore, when the drive shaft 4 is stopped, the winding shaft 6 rotates due to inertia, and the slat 8 is rotated between the drive shaft 4 and the winding shaft 6.
never slackens.

As described above, in the shutter drive device of this embodiment, when the shutter is opened, the take-up shaft 6 is rotated along with the drive shaft 4, and the amount of rotation exceeds the slat feed amount of the drive shaft 4, and the excess rotation is Since the amount is absorbed by the clutch mechanism 17, the slat 8 can be wound up between the drive shaft 4 and the winding shaft 6 in a constant state of tension.

Also, when closing the shutter 2, the belt 32
By rotating the drive shaft 4 with a small torque that resists the friction between the slat 8 and the brake drum 31, the slat 8 can be easily rewound and sent out along the guide rail 5.

Effects As detailed above, this invention provides shutter 2
Since the take-up shaft 6 is linked to the drive shaft 4 through the friction clutch 17 without relying on the biasing force of a spring, the shutter 2 can be opened without loosening the slats, and a large drive force is not required. This has the effect that the shutter 2 can be closed without having to close the shutter.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a shutter drive device embodying the present invention, FIG. 2 is a plan view of a shutter according to the present invention, FIG. Fig. 4 is a sectional view showing the slat in a contracted state, Fig. 5 is a front view showing the drive device of the shutter of the present invention, Fig. 6 is a side view thereof, and Fig. 7 is also a view showing one end of the drive shaft. 8 is a sectional view showing the other end of the drive shaft, FIG. 9 is a front view of one end of the winding shaft, and FIG. 10 is B in FIG. 9.
- This is a cross-sectional view taken along line B. Shutter...2, Storage box...3, Drive shaft...
4. Winding shaft...6, drive side clutch member...16, winding side clutch member...19.

Claims (1)

[Scope of Claims] 1. A winding shaft 6 provided in the storage box 3 for winding up the shutter 2; and a winding shaft 6 disposed parallel to the winding shaft 6, which moves the shutter 2 in the opening direction when the shutter 2 is opened. It is arranged between the sending drive shaft 4, the winding shaft 6 and the drive shaft 4, and the drive shaft 4
A drive-side clutch member 16 and a winding shaft 6 connected to
It is a friction clutch having a take-up side clutch member 19 connected to the winding side clutch member 19 and both clutch members 16, 19, and when the drive side clutch member 16 rotates with a torque less than a predetermined value during the opening operation of the shutter 2, the drive side clutch member 19 is connected to the winding side clutch member 19. When the side clutch member 16 and the take-up side clutch member 19 contact each other and rotate integrally, and the drive side clutch member 16 rotates with a torque of a predetermined value or more, the take-up side clutch member 19 engages with the drive side clutch member 16. and a friction clutch 17 configured to rotate in contact with the shutter while sliding. 2. The shutter drive according to claim 1, wherein the take-up shaft 6 is provided with a brake drum 31 at one end, and a belt 32 whose both ends are supported by the storage box 3 is hung around the brake drum 31. Device. 3. The shutter drive device according to claim 1, wherein the winding shaft 6 has a built-in roller clutch 26 to transmit driving force only in the shutter winding direction.