JP2012202080A - Shutter device and chain tension adjustment method in the shutter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect sagging of a chain by a simple structure.SOLUTION: A shutter device comprises an opening/closing body 10 opened and closed in a vertical direction, a take-up shaft 20 for winding and delivering the opening/closing body 10 on the upper side, a bearing bracket 30 for rotatably supporting the take-up shaft 20, an opener/closer 40 provided roughly in parallel on an opening/closing body thickness direction side to the take-up shaft 20, a follower sprocket 50 provided on an end part side of the take-up shaft 20, a drive sprocket 60 provided on an end part side of an output shaft 40a of the opener/closer 40, and a chain 70 wound around the follower sprocket 50 and the drive sprocket 60, and the opening/closing body 10 is suspended on a counter opener/closer side of the take-up shaft 20. In the shutter device, a sensor part 80 is provided below a lower side part 70a of the chain 70 between the follower sprocket 50 and the drive sprocket 60 so as to sense a sagging part when the lower side part 70a of the chain 70 sags for a prescribed amount.

Description

  The present invention relates to a shutter device configured to transmit a rotational force of an opening / closing machine to a winding shaft via a chain, and a chain tension adjusting method in the shutter device.

  The slack (loosening) of the power transmission chain in the shutter device causes tooth skipping, and if left untreated, there is a risk of chain cutting, sprocket damage, shutter curtain dropping, or the like. Thus, for example, in the prior art disclosed in Patent Document 1, a tensioner that urges the chain downward is provided on the upper side of the chain between the drive sprocket and the driven sprocket to detect the swing of the tensioner. By detecting the looseness of the chain, the drive source is stopped.

By the way, according to the prior art, the upper portion of the chain between the drive sprocket and the driven sprocket is pulled by the weight of the opening / closing body suspended on the winding shaft integral with the driven sprocket. For this reason, even if the chain is stretched, the upper portion of the chain is difficult to loosen and the tensioner may not be detected. Further, in the prior art, since the swingable tensioner is always in contact with the chain, problems such as noise and vibration may occur due to the contact.
Further, after detecting the slack of the chain, it is required to quickly eliminate the slack.

JP 2005-188236 A Japanese Patent Laid-Open No. 3-68299

  This invention makes it an example of a subject to cope with such a problem. In other words, it is possible to detect the slack of the chain with a simple structure with high accuracy, to reduce noise and vibration caused by contact with the chain under normal conditions, and to quickly eliminate the slack after detecting the slack of the chain. Are the objects of the present invention.

  Technical means for solving the above problems include an opening / closing body that opens and closes in an up / down direction, a winding shaft that winds and unwinds the opening / closing body on the upper side thereof, and a winding shaft that rotatably supports the winding shaft. Bearing bracket, an opening / closing device provided substantially parallel to the winding shaft thickness direction side with respect to the winding shaft, a driven sprocket provided on the end side of the winding shaft, and an output of the opening / closing device A shutter provided with a drive sprocket provided on the end side of the shaft, a chain wound around the driven sprocket and the drive sprocket, and the shutter being hung on the side opposite to the opening / closing machine of the winding shaft In the apparatus, when the lower part of the chain is slackened by a predetermined amount below the lower part of the chain between the driven sprocket and the drive sprocket, the sensing unit senses the slack part. Characterized by providing.

Since the present invention is configured as described above, the following effects can be obtained.
When the chain is stretched, the upper part of the chain between the driven sprocket and the drive sprocket is pulled by the weight of the opening / closing member suspended on the side opposite to the opening / closing machine of the winding shaft. On the other hand, slack is produced in the lower part of the chain between the driven sprocket and the drive sprocket. And this loose part is sensed by the sensing part. Therefore, the slack of the chain can be accurately detected with a simple structure.

It is a principal part side view which shows an example of the shutter apparatus which concerns on this invention, (a) shows a normal state, (b) shows the state which sensed the slack chain. It is a principal part perspective view of the shutter device. It is a principal part side view which shows the other examples of the shutter apparatus which concerns on this invention. It is a figure which shows an example of a spacer in each of (a) and (b). It is a principal part top view which shows an example of the tension adjustment method which concerns on this invention, (a) is the state before tension adjustment, (b) shows the state which moved the switch for tension adjustment and has inserted the spacer. . It is a principal part top view which shows an example of the tension adjustment method which concerns on this invention, (c) shows the state which pushed back the switch, (d) shows the state which completed tension adjustment.

  In the shutter device of the present embodiment, an opening / closing body that opens and closes in the vertical direction, a winding shaft that winds and unwinds the opening / closing body on the upper side thereof, and a bearing that rotatably supports the winding shaft. A bracket, an opening / closing device provided substantially parallel to the winding shaft thickness direction side with respect to the winding shaft, a driven sprocket provided on the end side of the winding shaft, and an output shaft of the opening / closing device In a shutter device comprising a drive sprocket provided on an end side, a driven sprocket and a chain wound around the drive sprocket, and the opening / closing body is suspended on the side opposite to the opening / closing machine of the winding shaft A sensing unit is provided below the lower part of the chain between the driven sprocket and the drive sprocket so as to sense the loose part when the lower part of the chain is loosened by a predetermined amount. Digits.

  Further, in order to further improve the sensing accuracy, the sensing unit is disposed below the lower part of the chain between the driven sprocket and the drive sprocket and closer to the drive sprocket.

  Further, in order to facilitate the work of fixing the sensing unit to the bearing bracket, the sensing unit is fixed to the bearing bracket by a magnet.

  Further, in order to facilitate the alignment of the sensing unit, the bearing bracket is provided with a mounting guide for mounting the sensing unit, and the mounting guide receives a lower end of the sensing unit. 1 receiving part and a 2nd receiving part which receives the edge part of the opening-and-closing body thickness direction of the said sensing part.

  In order to further improve the sensing performance and prevent damage to the sensing part due to chain contact, the sensing part is provided in a long shape along the longitudinal direction of the lower part of the chain and its end side. And a switch part that is provided on the bending direction side of the bending piece part and detects the bending piece part when bent.

  Further, as a chain tension adjusting method in the shutter device, a support member that supports the opening / closing machine from the winding shaft side is provided, and when the slack of the chain is detected by the sensing unit, the anti-sprocket side of the opening / closing machine Is separated from the support member, and a spacer is inserted into a gap between the switch and the support member, and the anti-sprocket side of the switch is pushed back to the support member side.

  Furthermore, in order to facilitate the tension adjustment work, the switch is fixed to the support member by a plurality of shaft-shaped members, and the spacer is a single or a plurality of shafts that can be inserted through the plurality of shaft-shaped members. It is an integral member having a notch.

In the present specification, the “opening / closing body thickness direction” means the thickness direction of the opening / closing body in the closed state.
Further, in this specification, the “opening / closing body width direction” means a direction that is substantially orthogonal to the opening / closing direction of the opening / closing body and not the thickness direction of the opening / closing body.
Further, in this specification, the “opening / closing body opening / closing direction” means a direction in which the opening / closing body slides in order to partition or open the space.

Hereinafter, preferred specific examples of the above embodiment will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the shutter device 1 includes an opening / closing body 10 that opens and closes in the vertical direction, and a guide rail (not shown) that guides the opening / closing body 10 in the vertical direction so as to surround the widthwise end of the opening / closing body 10. A winding shaft 20 that winds and unwinds the opening / closing body 10 on its upper side, a bearing bracket 30 that rotatably supports the winding shaft 20, and a thickness of the opening / closing body with respect to the winding shaft 20. The opening / closing machine 40 provided substantially parallel to the vertical direction, the driven sprocket 50 provided on the end side of the winding shaft 20, and the driven sprocket provided on the end side of the output shaft of the opening / closing machine 40. 50, a driven sprocket 60 having a diameter smaller than 50, a chain 70 wound around the driven sprocket 50 and the driving sprocket 60, and the opening / closing body 10 on the side opposite to the opening / closing machine of the winding shaft 20 (according to FIG. 1). Suspended to the right) I have to so that.
In this shutter device 1, when the lower part 70 a of the chain 70 is loosened by a predetermined amount below the lower part 70 a of the chain 70 between the driven sprocket 50 and the drive sprocket 60. A sensing unit 80 is provided to sense the part.

The opening / closing body 10 constitutes an opening / closing body main body 11 by connecting a plurality of so-called slats formed by bending a horizontally-long substantially rectangular metal plate in the opening / closing body opening / closing direction. A seat plate 12 for contacting a seating target site such as a floor surface, the ground, or a frame member is connected to the side (the lower end side in the illustrated example).
The end of the opening / closing body 10 in the opening direction is fixed to the outer peripheral surface of the winding body 21 of the winding shaft 20, and the end of the opening / closing body 10 in the width direction is the end of the winding body 21 in the axial direction. A predetermined amount protrudes from the portion.

  The winding shaft 20 is a substantially cylindrical winding body 21 and a shaft fixed to the radial center side of the winding body 21 and rotatably supported at both ends in the axial direction by bearing brackets 30. It consists of a main body 22.

The bearing bracket 30 is a metal flat plate member having a bent portion for reinforcement on the end side, and the shaft main body 22 of the winding shaft 20 is inserted into the through hole on the center side, and The shaft body 22 is rotatably supported by a bearing 31 (see FIG. 4) mounted around the shaft.
The bearing bracket 30 is made of a magnetic material (for example, a zinc steel plate, ferritic stainless steel, or other magnetic steel plate).

An attachment guide portion 32 for attaching the sensing portion 80 is provided on the outer side surface (front side surface according to FIG. 1) of the bearing bracket 30.
The mounting guide portion 32 is formed in a substantially L shape by partially notching the bearing bracket 30 and bending outward, and the first receiving portion 32 a that receives the lower end of the sensing portion 80 and the sensing portion 80. And a second receiving portion 32b for receiving an end portion in the opening / closing body thickness direction.

An opening / closing machine 40 is provided on the inner side of the bearing bracket 30 (the surface on the winding body 21 side).
The opening / closing machine 40 is configured in a substantially long cylindrical shape including a motor that drives and rotates the output shaft 40a and a brake device that brakes the rotation of the motor, and the winding shaft 20 side on the output shaft 40a side. A base 40 b is provided at the portion, and the base 40 b is fixedly fixed to the support member 41.

  The support member 41 is a member having a mounting surface 41a substantially upright on the bearing bracket 30, and a plurality of shaft-like members 42 (see FIG. 4) are inserted through the mounting surface 41a. The shaft-like member 42 is a bolt according to the illustrated example, and its screw portion is screwed to the base 40 b of the opening / closing device 40 and its head is locked to the mounting surface 41 a of the support member 41. It is tightened.

Further, a spacer 200 or 200 ′ is provided between the base 40b of the opening / closing machine 40 and the support member 41 as necessary for adjusting the tension of the chain 70.
The spacer 200 shown in FIG. 4A is a type that is inserted from above or below into the gap between the opening / closing machine 40 and the support member 41, and the opening through which the shaft-like member 42 (bolt) can be inserted is located above. Or it has the notch part 210 toward the downward direction (downward in the example of illustration).

  A spacer 200 ′ shown in FIG. 10B is a type that is inserted from the lateral direction into the gap between the opening / closing device 40 and the support member 41, and is an opening through which the shaft-like member 42 (bolt) can be inserted. Has a notch 210 ′ facing sideways. This spacer 200 'is used in the chain tension adjusting method described later.

  A driven sprocket 50, a drive sprocket 60, and a chain 70 are provided on the outer side of the bearing bracket 30 (the surface on the side opposite to the winding body 21).

The driven sprocket 50 is fixed to the outer periphery of the shaft body 22 outside the bearing bracket 30 (front side according to FIG. 1).
The drive sprocket 60 is fixed to the output shaft 40 a of the opening / closing device 40.
The chain 70 is a metal roller chain, and is wound around both sprockets so as to transmit the rotational force of the drive sprocket 60 to the driven sprocket 50.

The sensing unit 80 is a general limit switch (also referred to as a micro switch) that turns on a contact when the actuator unit is pushed, and a permanent magnet 81 is provided on a side surface portion thereof (a contact surface with the bearing bracket 30). It is fixed.
The sensing unit 80 is disposed near the drive sprocket 60. If it demonstrates in detail, this attachment guide part 32 will be arrange | positioned in the drive sprocket 60 side rather than the substantially center part of the length direction in the lower part 70a of the chain 70 below this lower part 70a.
The sensing portion 80 is positioned by the mounting guide portion 32 of the bearing bracket 30 so that the actuator portion is brought close to the lower portion 70a of the chain 70 from the lower side thereof. Adsorbed and fixed.

Next, the characteristic operation and effect of the shutter device 1 having the above configuration will be described in detail.
In the shutter device 1, when the chain 70 extends due to long-term use or the like, the lower portion 70 a of the chain 70 between the driven sprocket 50 and the drive sprocket 60 is loosened.
That is, in the driven sprocket 50, the upper portion 70b of the chain 70 is pulled in the direction (clockwise according to FIG. 1) due to the weight of the opening / closing body 10 suspended on the side opposite to the opening / closing device 40 of the winding shaft 20. A rotational force is generated. Therefore, the upper portion 70b of the chain 70 is not easily loosened, but the lower portion 70a of the chain 70 is easily loosened.

Further, the lower portion 70 a of the chain 70 tends to be loosened by being biased toward the drive sprocket 60.
That is, when the drive sprocket 60 is rotated in the opening / closing body winding direction (counterclockwise according to FIG. 1) by the opening / closing device 40, the rotation direction faces the gravitational direction of the opening / closing body 10; Compared with the case where the sprocket 60 is rotated in the opening / closing body feeding direction (clockwise according to FIG. 1), the slack of the lower portion 70a of the chain 70 becomes larger. In this rotational direction (counterclockwise), the lower portion 70a of the chain 70 tends to be loosened more quickly at a position closer to the drive sprocket 60 than at the driven sprocket 50 side.

Therefore, in the shutter device 1 of the present embodiment, the sensing unit 80 is disposed below the lower portion 70a of the chain 70 between the drive sprocket 60 and the driven sprocket 50 and closer to the drive sprocket 60. The detection accuracy when detecting the slack of the chain 70 is improved.
Particularly preferably, as shown in FIG. 1, when the sensing unit 80 is projected onto the surface of the bearing bracket 30, the distance from the center of the output shaft 40a is the distance between the center of the shaft body 22 and the center of the output shaft 40a. It is arranged closer to the drive sprocket 60 so as to be a distance shorter than a half of the distance.
More preferably, the sensing unit 80 is closer to the drive sprocket 60 so that the distance from the center of the output shaft 40a is shorter than one third of the distance between the center of the shaft body 22 and the center of the output shaft 40a. Placed in.
Further, as shown in FIG. 1, the sensing unit 80 is preferably disposed below the lower end of the outer peripheral portion of the drive sprocket 60 and above the lower end of the outer peripheral portion of the driven sprocket 50.

In the above embodiment, the sensing unit 80 is always enabled. However, as another preferred mode, only when the drive sprocket 60 is rotated in the opening / closing body winding direction (counterclockwise according to FIG. 1). Alternatively, the output signal of the sensing unit 80 may be validated and the output signal of the sensing unit 80 may be invalidated when the drive sprocket 60 is rotated in the opening / closing body feeding direction (clockwise according to FIG. 1).
According to this configuration, as described above, since the sensing by the sensing unit 80 is performed in a state where the lower portion 70a of the chain 70 is easily loosened, the sensing accuracy can be further improved, and the chain 70 can be further slackened. It can be sensed effectively.

  Next, another example of the shutter device according to the present invention will be described. In addition, since the shutter device shown below is obtained by changing a part of the shutter device 1 described above, only the changed portion will be mainly described in detail. The same reference numerals as those of the apparatus 1 are used, and a detailed description thereof is omitted.

The shutter device 2 illustrated in FIG. 3 is obtained by replacing the sensing unit 80 described above with a sensing unit 90.
The sensing portion 90 is provided in an elongated shape along the longitudinal direction of the lower portion 70a of the chain 70, and a bending piece portion 91 having an end portion fixed to the bearing bracket, and a bending direction of the bending piece portion 91 And a switch portion 92 that detects the bending piece 91 when bent and provided on the side.

  The bending piece 91 is a long plate-like member that can be elastically bent, such as a spring material, in the vicinity of the lower surface of the lower portion 70a of the chain 70 and in the longitudinal direction of the lower portion 70a. 3 and has a bent portion 91a (a substantially U-shaped portion according to an example of FIG. 3) on the distal end side, and the proximal end portion is fixed to the bearing bracket 30. Yes. The bent portion 91a prevents the lower portion 70a of the chain 70 from being caught on the tip of the bent piece 91, and the bent piece 91 is prevented from being deformed or damaged.

  The switch unit 92 is a limit switch that is substantially the same as the sensing unit 80, and is disposed on the lower side of the bending piece 91, positioned by the mounting guide unit 32, and provided on the surface on the bearing bracket 30 side. It is attracted and fixed to the bearing bracket 30 by a magnetic force (not shown).

  According to the shutter device 2 configured as described above, when the lower portion 70 a of the chain 70 is slackened between the driven sprocket 50 and the drive sprocket 60, the slackened portion comes into contact with the flexible piece portion 91, and the tip of the flexible piece portion 91. The side bends downward. Therefore, the bent piece 91 that has been bent comes into contact with the switch 92, and the switch 92 is activated to output a sensing signal.

According to the shutter device 2, since the bending piece 91 is arranged in a long shape over the longitudinal direction of the lower part 70 a of the chain 70, the lower part 70 a of the chain 70 is any part in the longitudinal direction. The slack can be sensed even if it is slack.
Further, since the chain 70 when slackened does not directly contact the switch portion 92, damage to the switch portion 92 can be prevented.

  Next, a chain tension adjusting method performed when the sensing unit 80 (or 90) senses slack in the chain 70 will be described.

  When the tension of the chain 70 is adjusted based on the stop or warning of the shutter device 1 by the detection signal of the detection unit 80, first, the base 40b of the opening / closing device 40 is fixed to the mounting surface 41a of the support member 41. The plurality of shaft-like members 42 (bolts) are loosened.

  In the next step, the portion of the opening / closing machine 40 that extends toward the anti-sprocket side (left side according to FIG. 5) is pulled away from the support member 41. At this time, the opening / closing machine 40 can be easily moved by the lever principle with the sprocket side of the base 40b (the right end side according to FIG. 5) as a fulcrum (see FIG. 5B).

  In the next step, according to the slackness of the chain 70 detected in the above step, the spacer 200 ′ is inserted between the base 40b of the switch 40 and the support member 41 from the side thereof ( (Refer FIG.5 (b)).

At this time, the thickness or number of the spacers 200 ′ is changed as necessary.
That is, when the slack of the chain 70 is relatively small, a relatively thin spacer 200 ′ is used or the number of spacers 200 ′ is relatively small.
When the slack of the chain 70 is relatively large, a relatively thick spacer 200 ′ is used or the number of the spacers 200 ′ is relatively large.

  In the next step, the anti-sprocket side of the switch 40 is pushed back to the support member 41 side (see FIG. 6C). At this time, the opening / closing device 40 can be easily moved by the above-described principle of the lever.

  Then, as described above, while pushing back the anti-sprocket side of the opening / closing machine 40 toward the support member 41 side, or after pushing back, the spacer 200 ′ has its left and right ends substantially coincided with the left and right ends of the base 40b. Push it in until it reaches a fixed position (see FIG. 6D).

  Then, as a next step, all of the loosened shaft-like members 42 (bolts) are tightened.

  Therefore, according to the above method, the slack of the chain 70 can be easily detected by the sensing unit 90 without individual difference, and the slack can be quickly eliminated after the slack of the chain 70 is detected.

  According to the embodiment, the sensing unit 80 is attracted and fixed to the bearing bracket 30 by the magnetic force of the permanent magnet 81 provided on the sensing unit 80. As another example, a magnet is provided on the bearing bracket 30 side. In addition, the sensing unit 80 may be provided with a magnetic material, and the sensing unit 80 may be attracted and fixed to the bearing bracket 30 by the attractive force of the magnet and the magnetic material. As yet another example, the sensing unit 80 can be fixed to the bearing bracket 30 with a double-sided tape, an adhesive, a screw, or the like.

In addition, the sensing unit 80 is configured to sense the chain 70 when slackened. However, as another example of this sensing unit, a configuration that senses the chain 70 when slacked (non-contact sensing). , Phototube switch, proximity switch, etc.).
Similarly, the sensing unit 90 is configured to detect contact with the bent piece 91 when bent, but as another example of the detected unit, non-contact detection is performed for the bent piece 91 when bent. It is also possible to adopt a configuration (specifically, a phototube switch, a proximity switch, etc.).

  Further, according to the above embodiment, the chain 70 is a metal roller chain. However, the chain 70 may be a rubber chain, a chain made of other materials, a belt, or the like.

  In the above embodiment, the opening / closing body 10 is formed by connecting a plurality of slats. However, as another example of the opening / closing body, a sheet-like member, a net-like member, a pipe, or a panel is connected in the opening / closing direction. It is also possible to adopt a mode in which these sheet-like members, net-like members, slats, pipes, panels and the like are appropriately combined.

DESCRIPTION OF SYMBOLS 1, 2: Shutter device 10: Opening and closing body 20: Winding shaft 30: Bearing bracket 32: Mounting guide part 32a: 1st receiving part 32b: 2nd receiving part 40: Opening / closing machine 50: Driven sprocket 60: Drive sprocket 70: Chain 70a: Lower part 80: Sensor

Claims (7)

  An opening / closing body that opens and closes in the vertical direction, a winding shaft that winds and unwinds the opening / closing body on its upper side, a bearing bracket that rotatably supports the winding shaft, and the winding shaft An opening / closing machine provided substantially parallel to the opening / closing body thickness direction side, a driven sprocket provided on the end side of the winding shaft, and a drive sprocket provided on the end side of the output shaft of the opening / closing machine; A shutter device provided with the driven sprocket and a chain wound around the driving sprocket, wherein the opening / closing body is suspended on the side opposite to the opening / closing device of the winding shaft, and between the driven sprocket and the driving sprocket. A shutter device, wherein a sensing unit is provided below the lower part of the chain so as to sense the loosened part when the lower part of the chain is slackened by a predetermined amount.   The shutter device according to claim 1, wherein the sensing unit is disposed below the lower portion of the chain between the driven sprocket and the drive sprocket and closer to the drive sprocket.   The shutter device according to claim 1, wherein the sensing unit is fixed to the bearing bracket by a magnet.   The bearing bracket is provided with an attachment guide portion for attaching the sensing portion. The attachment guide portion includes a first receiving portion for receiving a lower end of the sensing portion, and an opening / closing body thickness direction of the sensing portion. The shutter device according to claim 1, further comprising a second receiving portion that receives the end portion.   The sensing portion is provided in a long shape along the longitudinal direction of the lower portion of the chain, and a bending piece portion whose end portion is fixed to the bearing bracket, and a bending direction portion of the bending piece portion is provided. The shutter device according to any one of claims 1 to 4, further comprising a switch portion that detects the bending piece portion when the bending piece is bent.   A support member that supports the switch from the take-up shaft side, and when the loosening of the chain is detected by the sensing unit, the anti-sprocket side of the switch is separated from the support member, and the switch and the support 6. The chain tension adjusting method for a shutter device according to claim 5, wherein a spacer is inserted into a gap between the members, and the anti-sprocket side of the opening / closing machine is pushed back to the support member side.   The opening / closing machine is fixed to the support member by a plurality of shaft-shaped members, and the spacer is an integral member having one or a plurality of cutout portions through which the plurality of shaft-shaped members can be inserted. The chain tension adjusting method according to claim 6.

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