JPH056392Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention utilizes a winding transmission element composed of a sprocket and a roller chain driven by a switchgear composed of a motor, a speed reducer, etc. This invention relates to a driving device for a heavy shutter that winds up and lowers a slat curtain of the heavy shutter.

[Conventional technology]

Conventionally, in this type of shutter drive device, the slat would suddenly drop due to breakage of the roller chain, such as elongation of the roller chain due to wear during winding of the slat, or breakage of the roller chain due to fatigue caused by repeated loads. There have been accidents where a body or a part of an object has been caught or hit between the drain and the floor of the aisle, and many measures have been taken to ensure safety in the event of this type of roller chain breakage failure. Methods and mechanisms are known.

For example, as a safety mechanism for this type of slat hoisting drive device, two sets of hoisting transmission elements having sufficient strength against the hoisting load using only one set of sprocket and roller chain are arranged coaxially and adjacently.
It is known that the sprocket group on the winding shaft side is all fixed to the winding shaft.

That is, according to the above-mentioned drive device, when hoisting the slat, winding transmission is normally performed while the load is shared between the two sets of winding transmission elements, and as described above, one of the two sets of roller chains is If an unexpected breakage failure occurs in one of the two, the other one can continue the normal winding operation.

[Problem that the invention attempts to solve]

However, in the conventional slat hoisting technology as described above, since both of the two sets of roller chains perform the hoisting operation when hoisting the slat, approximately the same distributed load of the slat is loaded on the two sets of roller chains. There will be. Therefore, even if it is possible to lengthen the expected life of the roller chain itself in terms of usage conditions, it is unavoidable that the roller chain will eventually reach the end of its life due to fatigue failure. Two sets of strong roller chains reach the end of their service life due to fatigue failure at almost the same time.
It is conceivable that both roller chains in the set may fail due to breakage. Then, there was the inconvenience that a disaster could occur due to these potentially unsafe conditions and unsafe operations.

The present invention was devised to eliminate such inconveniences, and a clutch is interposed between the two sprockets on the winding shaft so that one of the winding transmission elements is normally idling with no load. When a breakage failure occurs in the other roller chain, which is constantly under load, the winding transmission element that is idling is switched to one of the winding transmission elements, and the winding operation is continued via the clutch. The object of the present invention is to provide a shutter drive device equipped with a safety device.

[Means for solving problems]

The structure of the present invention for achieving the above object will be explained with reference to drawings corresponding to embodiments.

That is, the present invention provides a winding transmission element 1 which is composed of the opening/closing machine side driven by the opening/closing machine 6, the slat curtain winding shaft side sprockets 7a and 7b, 8a and 8b, and roller chains 7c and 8c.
In a drive device for a shutter that winds up and lowers a slat curtain 2 of a shutter by means of 0 and 11, only one set of the opening/closing machine side and winding shaft side sprockets 7a and 7b or 8a and 8b and the roller chain 7c or 8c are used. Wrapped conductive element 10 having sufficient strength against hoisting load
Alternatively, two sets of sprockets 11 are disposed adjacently on the same axis, and the sprocket group on the winding shaft 9 side is loosely fitted to the main sprocket 7b fixed to the winding shaft 9 and the winding shaft 9. The sprocket group on the opening/closing machine side is composed of a main drive sprocket 7a and an auxiliary drive sprocket 8a, which are respectively fixed to the drive shaft of the opening/closing machine. Furthermore, the main sprocket 7b and the auxiliary sprocket 8b on the winding shaft 9 side are
Convex portions and concave portions 16a and 1 that engage with each other in opposite directions
9a, 16b and 19b, 20a and 17a, 20b
and 17b, there is an appropriate play 22 in the circumferential direction.
The drive device for a shutter is characterized in that it is engaged by clutches 18, 21 having clutches 18, 21, 22a, 22b, 23a and 23b.

[Effect]

According to the shutter drive device 4 according to the present invention, the winding operation is normally performed by the main winding transmission element 10 on the main sprocket 7b side, and at this time, the auxiliary sprocket 8b is disposed between the main sprocket 7b and the main sprocket 7b. Appropriate plays 22a, 22b, 23a, and 23b are formed in the clutches 18 and 21, which are provided in the figure, so that the clutches 18 and 21 are allowed to idle in an unloaded state by the auxiliary roller chain 8c without engaging the main sprocket 7b. From, auxiliary roller chain 8
c is maintained in a state with almost no wear or fatigue.

Here, when a breakage failure occurs in the main roller chain 7c, the auxiliary sprocket 8b continues to rotate by the auxiliary winding transmission element 11 on the auxiliary sprocket 8b side, and the rotation of the auxiliary sprocket 8b is controlled via the clutches 18 and 21. The signal is transmitted to the main sprocket 7b. Since the main sprocket 7b is fixed to the winding shaft 9, the winding operation of the slat 2 is performed by the auxiliary winding conduction element 11 on the auxiliary sprocket 8b side.
will continue without any problem.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The shutter drive device according to the present invention will be explained in detail below with reference to an embodiment shown in FIGS. 1 to 5.

FIG. 1 is a front view showing a schematic configuration of the entire shutter in which a shutter drive device according to the present invention is incorporated into the shutter body, FIG. 2 is a side view of the same, and FIG. FIG. 4 is a partially cutaway front view showing a main sprocket and an auxiliary sprocket in a cross section of the main sprocket of the shutter drive device according to the embodiment, and FIG. FIG. 3 is a side view showing a cross section taken along the line ``-'' in order to explain the relationship of play between the clutches, and FIG. In a side view showing a line cross section, a is
Fig. 5 is a side view of the main sprocket side clutch, and b is a side view of the auxiliary sprocket side clutch.

First, the structure of the entire shutter body will be schematically explained based on FIGS. 1 and 2.

In the figure, the shutter body consists of grooved guide rails 1a and 1b vertically disposed on both the left and right sides.
and a slat curtain 2 and a drainer 3 consisting of a long armor plate which are held movably up and down in the grooves of the guide rails 1a and 1b, and a a slat drive mechanism 4 disposed at an upper position extending substantially over the entire length of the slat curtain 2;
and a push button switch 5 suspended vertically from the slat drive mechanism 4 to the lower side in order to operate the slat drive mechanism 4.

Further, the slat drive device 4 is provided with a switch 6 consisting of a motor, a speed reducer, etc. on the right side of the front, and the shaft of the switch 6 is arranged in order from the side closest to the switch 6. A main drive sprocket 7a and an auxiliary drive sprocket 8a are fixedly adjacent to each other. Further, in the upper part of the slat drive device 4, a take-up shaft 9 is mounted horizontally on the side wall, and on the front right side of the take-up shaft 9 is a main sprocket 7b fixed to the take-up shaft 9. An auxiliary sprocket 8b fitted to the shaft 9 is disposed adjacent to the shaft 9. and between the main drive sprocket 7a and the main sprocket 7b and between the auxiliary drive sprocket 8a.
A main roller chain 7c and an auxiliary roller chain 8c that mesh with these sprockets are placed between the sprocket and the auxiliary sprocket 8b.
a, 7b, and 7c, and 8a, 8b, and 8c constitute a main winding conduction element 10 and an auxiliary winding conduction element 11, respectively.

On the other hand, the winding shaft 9 has the slat 2
The top edge of is fixed. Therefore, when winding up the slat 2, the main winding transmission element 10 normally moves the winding shaft 9 to the second winding shaft 9.
Slut 2 to rotate in the direction of arrow A shown in the figure.
winding is performed.

Next, the main sprocket 7b and the auxiliary sprocket 8b will be described in detail with reference to FIGS. 3 to 5.

As shown in FIG. 3, a main sprocket 7b and an auxiliary sprocket 8b are disposed in order from the left on the front right side of the winding shaft 9, with each hub abutting the main sprocket 7b. The key 13 is secured to the take-up shaft 9, and the key 13 is fastened to the hub of the main sprocket 7b by a pin 14.

A gunmetal bushing 15, into which a lubricant such as grease is injected into the center, is press-fitted into the inner peripheral surface of the hub of the auxiliary sprocket 8b, which is disposed adjacent to the right side of the main sprocket 7b. The auxiliary sprocket 8b is rotatably held on the winding shaft 9 via the gunmetal bushing 15. Note that the main drive sprocket 7
a and the auxiliary drive sprocket 8a, and the main sprocket 7b and the auxiliary sprocket 8b are formed to have the same tooth profile, the same pitch, the same number of teeth, and therefore the same diameter, and the main and auxiliary winding transmission Elements 10 and 11 are each constructed to have sufficient strength to withstand hoisting loads.

Further, on the right side of the hub that contacts the auxiliary sprocket 8b of the main sprocket 7b, as shown in FIG. A main sprocket side clutch 18 is formed with fan-shaped recesses 17a and 17b on the left and right sides at 180° intervals.
Further, on the left side surface of the hub that contacts the main sprocket 7b of the auxiliary sprocket 8b, as shown in FIG. The auxiliary sprocket side is formed with fan-shaped recesses 19a, 19b that engage with the main sprocket side clutch 18, and fan-shaped convex portions 20a, 20b that engage with the recesses 17a, 17b of the main sprocket side clutch 18 on the left and right sides of the main sprocket side clutch 18 at intervals of 180° in the circumferential direction. A clutch 21 is constructed.

Moreover, the convex portions 16a, 16b and 20a, 20b of the main sprocket side clutch 18 and the auxiliary sprocket side clutch 21 are as follows:
As shown in Fig. 5, both sides of the sector are formed so that they are located within an appropriate angle θ from the angle formed by the orthogonal axes AA' and BB', which intersect at an angle of 45° with the orthogonal coordinate axes, and On the contrary, the recesses 17a, 17b of the main sprocket side clutch 18 and the auxiliary sprocket side clutch 21, respectively.
19a and 19b have fan-shaped side surfaces located outside the angle formed by the orthogonal axes AA' and BB' by an appropriate angle θ, respectively.

Therefore, when the shutter driving device 4 is operated by the opening/closing machine 6, there is always a fourth convex portion between the convex portion 16a of the main sprocket side clutch 18 and the concave portion 19a of the auxiliary sprocket side clutch 21. As shown in the figure, the play of approximately θ×2 22
a and 22b are formed on both sides of a sector-shaped shape. Other convex portions 6b and concave portions 1
9b, the relative positions of the convex portion 20a and the concave portion 17a, and the convex portion 20b and the concave portion 17b are also exactly the same as above,
Plays 23a and 23b, 22a and 23a, and 22b and 23b of approximately θ×2 are formed on both sides of the fan shape, respectively.

Next, the operation of the embodiment of the present invention constructed as above will be explained.

First, the main winding transmission element 10, which is normally constituted by the main drive sprocket 7a, the main roller chain 7c, and the main sprocket 7b, is operated by the opening/closing machine 6.
As a result, the winding shaft 9 and the winding drum 12 are rotated, and the winding operation of the slat 2 is performed. At this time, since the auxiliary drive sprocket 8a is also rotated at the same time, the auxiliary sprocket 8b is also rotated in the same direction and at the same speed as the main sprocket 7b by the auxiliary roller chain 8c. Therefore, at this time, the main sprocket side clutch 18 and the auxiliary sprocket side clutch 21 have play 22a, 22b, 2 between the convex portion and the concave portion.
3a and 23b are maintained and are not engaged, and the auxiliary winding transmission element 11 is idled in a no-load state, so the auxiliary roller chain 8c
has been maintained with little wear or fatigue. In addition, during the above-mentioned constant operation, the plays 22a, 22b, 23a, and 23b between the convex portions and concave portions of the main sprocket side clutch 18 and the auxiliary sprocket side clutch 21 are initial due to pitch errors of the main and auxiliary roller chains 7c and 8c. The value of .theta. is appropriately set so that the engagement state of both clutches 18 and 21 is completely disengaged, although the amount of play may be slightly smaller than the amount of play .theta..times.2.

Next, if a breakage failure occurs in the main roller chain 7c during the winding of the slat 2 in the above state, the main drive sprocket 7a will only idle and the power will not be transmitted by the main winding transmission element 10. The slat 2 attempts to naturally descend without any movement, but at this time, the clutch 21 on the auxiliary sprocket side of the auxiliary sprocket 8b, which continues to idle due to the auxiliary winding transmission element 11, is moved by the main roller chain 7c.
Since the main sprocket 7b is brought into engagement with the main sprocket side clutch 18 which has stopped due to breakage, the power of the auxiliary winding transmission element 11 is newly transmitted via the main sprocket 17b and the winding shaft 9. The hoisting operation of the slat 2 continues without any problem. By the time the clutches 18 and 21 are engaged, the main sprocket 7b is also reversed by the amount of play of the clutches due to the weight of the slat 2 via the winding shaft 9. The slat 2 will be lowered, but the angle at which the slat 2 is reversed will be lowered by the clutch 2 on the auxiliary sprocket side.
Since the main sprocket 1 is rotated in the normal rotation direction, the amount of reverse rotation of the main sprocket 7b is actually very small, and the amount of descent of the slat 2 is not a problem.

[Effect of idea]

As described in detail above, according to the shutter driving device of the present invention, a clutch is provided between the two sprockets on the winding shaft, and the auxiliary winding transmission element is normally idled with no load. The auxiliary roller chain is maintained in a state with little wear or fatigue, and in the event of an unexpected breakage failure of the main roller chain, the auxiliary wrapped transmission element including said auxiliary roller chain and the clutch are Since the power is switched and transmitted through the roller chain, it is possible to prevent accidents caused by unexpected breakage due to elongation or fatigue failure of the roller chain, and it also prevents two sets of roller chains from breaking at almost the same time. This eliminates potential unsafe conditions and accidents due to unsafe operation during slat hoisting, ensuring safe operation. Furthermore, the structure and handling of the equipment are extremely simple and can be manufactured at low cost. Together, a significant practical effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a schematic configuration of the entire shutter in which a shutter drive device according to the present invention is incorporated into the shutter body, FIG. 2 is a side view of the same, and FIG. FIG. 4 is a partially cutaway front view showing a main sprocket and an auxiliary sprocket in a cross section of the main sprocket of the shutter drive device according to the embodiment, and FIG. FIG. 3 is a side view showing a cross section taken along the line ``-'' in order to explain the relationship of play between the clutches, and FIG. In a side view showing a line cross section, a is
Fig. 5 is a side view of the main sprocket side clutch, and b is a side view of the auxiliary sprocket side clutch. 2...Slat, 4...Shutter drive device, 6...Opening/closing machine, 7b...Main sprocket, 7
c... Main roller chain, 8b... Auxiliary sprocket, 8c... Auxiliary roller chain, 9... Winding shaft, 10... Main winding transmission element, 11... Auxiliary winding transmission element, 16a, 16b and 20a, 20
b...Protrusion, 17a, 17b and 19a, 19
b...Concavity, 18...Main sprocket side clutch, 21...Auxiliary sprocket side clutch, 22
a, 22b, 23a, 23b...play.

Claims (1)

[Scope of utility model registration request] The slat curtain of the shutter is rolled up and lowered by a winding transmission element formed by winding a roller chain between the opening/closing machine side sprocket driven by the opening/closing machine 6 and the slat curtain winding shaft 9 side sprocket. In the drive device of the shutter, a winding transmission element having sufficient strength against the hoisting load with only one set of sprockets and roller chains on the opening/closing machine 6 side and the winding shaft 9 is connected to the opening/closing machine 6 side and the winding shaft 9. The sprocket group on the winding shaft 9 side includes a main sprocket 7b fixed to the winding shaft 9 and an auxiliary sprocket loosely fitted to the winding shaft 9. The sprocket group on the opening/closing machine 6 side is composed of a main drive sprocket 7a and an auxiliary drive sprocket 8a, which are fixed to the drive shaft of the opening/closing machine 6, respectively, and a main sprocket 7b on the winding shaft 9 side.
and the auxiliary sprocket 8b are engaged by a clutch consisting of a convex part and a concave part formed with concave and convex portions on opposing surfaces and engaged in the axial direction and engaged in the circumferential direction with appropriate play. A shutter drive device featuring: