JP3115231U - Roof snow removal equipment - Google Patents

Abstract

An object of the present invention is to provide a belt conveyor type snow removal device that can be securely fixed to a roof and can be easily constructed.
In a snow lowering device that removes snow from a roof by a belt that rotates snow accumulated on the roof, a support frame 10 attached to the roof, and a pair of upper and lower rollers 21 and 22 rotatably supported by the support frame 10; The endless belt 30 hung between the rollers, the fixing bolt 40 fixed upright in a through hole 121 provided in the roof for fixing the support frame 10 to the roof, and the distance between the rollers are adjusted. And a tension adjusting mechanism 60 that applies tension to the belt.
[Selection] Figure 1

Description

  The present invention relates to a snow removal device for a roof, and more particularly to a belt conveyor type snow removal device.

In snowy countries, not only does it take a lot of work to remove snow from the roof, but there are always falling accidents during work, which necessitates dangerous work. In order to relieve such severe and dangerous work, various snow removal devices have been proposed. Among them, as a belt conveyor type, for example, various devices such as Patent Document 1 have been proposed.
However, these snow removal devices need to be securely fixed to the roof, but the actual construction is not taken into consideration and cannot be constructed.
JP-A-10-140877

  SUMMARY OF THE INVENTION An object of the present invention is to provide a belt conveyor type snow removal device that can be securely fixed to a roof and is easy to construct.

The invention according to claim 1 is a snow lowering device that removes snow from a roof by a belt that rotates snow accumulated on the roof, a support frame attached to the roof, a pair of upper and lower rollers rotatably supported by the support frame, An endless belt hung between rollers, a fixing bolt fixed upright in a through-hole provided in the roof to fix the support frame to the roof, and a roller position adjustment for adjusting the distance between the rollers A mechanism and a tension adjusting mechanism that applies tension to the belt are provided.
The device according to claim 2 is provided with a driving force transmission member for driving at least one of the rollers.

According to a third aspect of the present invention, the roller has a lower roller provided on the eaves side of the roof and an upper roller provided on the upper part of the roof, and the lower roller is larger in diameter than the upper roller and has a rain gutter on the eaves of the roof. It is arranged outside and covers the gutter.
According to a fourth aspect of the present invention, the roller includes a roller shaft that is rotatably supported by the support frame via a rolling bearing, and a roller body that is fixed to the roller shaft. An anti-slip pattern for the projection or groove is provided.

  According to a fifth aspect of the present invention, the anti-slip pattern has an inclined line formed by protrusions or grooves that gradually incline toward the left and right ends with respect to the center line in the transport direction at a predetermined interval in the rotation direction. In the illustrated example, it is provided symmetrically with respect to the center line.

The invention according to claim 6 is provided with a tilt portion projecting in a flange shape at both ends of the roller body, and restricts the right and left bias of the belt.
In the device according to claim 7, the boundary portion between the tilt portion and the cylindrical surface of the roller body is an arc-shaped round portion.

The invention according to claim 8 is characterized in that the roller body has a cylindrical hollow structure and is provided with a plurality of holes for weight reduction and drainage of the roller.
In the device according to claim 9, the tip of the fixing bolt is pointed.
In the device according to claim 10, the gap between the fixing bolt and the through hole is sealed with a caulking agent.

According to the eleventh aspect of the present invention, the roller position adjusting mechanism adjusts the position of the roller, and the drive roller is supported so as to be movable by a predetermined amount back and forth in a direction parallel to the roof gradient with respect to the support frame. ing.
According to the twelfth aspect of the present invention, a slide guide is fixed to the end of the support frame on the eaves side, and a bearing that supports the shaft end of the roller shaft of the lower roller is slidable in a direction parallel to the gradient of the roof. The slide guide is provided with a position adjusting screw for adjusting the longitudinal position of the shaft end of the drive roller.

According to a thirteenth aspect of the present invention, the tension adjusting mechanism includes a tension member that bites into the lower surface side of the belt after completion of belt conveyance.
According to a fourteenth aspect of the present invention, the tension member is disposed in the vicinity of the lower roller, and has a structure that avoids interference with a gutter at the eaves of the belt or the tip of the eaves.

According to a fifteenth aspect of the present invention, the tension member is a roller, and the shaft end portion of the roller shaft is fixed by a set screw through a long hole provided in an adjustment plate fixed to the support frame.
The invention according to claim 16 is provided with side plates on the left and right side edges of the belt that block the space between the belt conveyance surface and the return surface and between the belt return surface and the roof and prevent snow and wind from entering. It has been.

The invention according to claim 17 is provided with a snow scraping member for scraping off snow adhering to the surface of the belt.
According to the eighteenth aspect of the present invention, a support member for supporting a snow load accumulated on the conveyance surface is disposed between the conveyance surface and the return surface of the belt.
The device according to claim 19 is characterized in that a work passage space is provided on the roof adjacent to the snow lowering device.

The invention according to claim 20 is characterized in that snow lowering devices are installed at a plurality of locations on the roof across a work passage space.
The invention according to claim 21 is characterized in that the power transmission member of the drive roller is connected to an electric motor and is driven electrically.
The invention according to claim 22 is characterized in that the power transmission member of the drive roller is connected to the manual operation portion and is driven manually.
The invention according to claim 23 is provided with a stopper mechanism for regulating the rotation of the belt.

In the snow lowering device of the present invention, a through hole is made from a roof material side such as a roof tile to the attic, and a bolt is raised and integrated, and the support frame is fixed to the roof using this bolt. Since the support frame is fixed to the bolt, the construction work is easy and the apparatus can be fixed integrally with the roof. The gap between the anchor member and the roof hole is sealed with a caulking agent.
Even if there are variations in the length of the belt, the dimensions of the support frame, and the like, the variations can be absorbed by the roller interval adjustment mechanism after the belt is wound around the rollers.
Furthermore, since the belt is configured to apply an appropriate tension to the belt by the tension adjusting mechanism, the belt can be prevented from slacking and contact between the lower surface of the belt and roofing material such as tiles can be prevented. Damage can be prevented.

By concentrating these roller spacing adjustment mechanisms and tension adjustment mechanisms on the eaves side of the roof, you can work from the back of the belt while standing on a ladder or the like without having to bend over an unstable roof. Adjustment work can be done easily.
Further, if the driving force is transmitted to the eaves side roller, it can be driven from the ground side regardless of whether it is driven by a motor or manually.

FIG. 1 is a schematic configuration diagram of a snow lowering apparatus according to an embodiment of the present invention.
This snow lowering device includes a support frame 10, a pair of upper and lower lower rollers 21 and 22 that are rotatably supported by the support frame 10, an endless belt 30 wound around rollers 21 and 22, and a support. A fixing bolt 40 for fixing the frame 10 to the roof, a roller position adjusting mechanism 50 that adjusts the distance between the rollers 21 and 22, and a tension adjusting mechanism 60 that applies tension to the belt 30 are provided.
As shown in FIG. 2, the support frame 10 includes a pair of left and right vertical frames 11 and 11 that extend linearly from the top side of the roof 100 toward the eaves, and upper and lower horizontal frames that extend in a direction orthogonal to the vertical frames 11 and 11. A plurality of reinforcing members 12 extending in the vertical direction are stretched between the upper and lower horizontal frames 13 and 13 in a configuration in which the frames 13 and 13 are assembled in a square shape. As the material of the support frame 10, a material having high corrosion resistance, for example, a stainless material is used.

The lower roller 21 has a larger diameter than the upper roller 22 and is disposed outside the gutter 110 at the eaves of the roof 100. A power transmission member 24 such as a gear, a pulley for belt transmission, and a sprocket for chain transmission is provided. The drive side roller. However, it may be a roller for driving the upper roller. The tangent line that touches the upper surface arc of both the lower roller 21 and the upper roller 22 is arranged to be parallel to the upper surface of the roof 100, and the lower end of the lower roller 21 is located lower than the upper end of the rain gutter 110. 110 is covered.
The structures of the lower roller 21 and the upper roller 22 are basically the same except that their diameters are different. That is, a roller shaft 201 rotatably supported on the support frame 10 via the bearing 23 and a roller body 202 fixed to the roller shaft 201 are provided, and the belt 30 is wound around the roller body 202. As the bearing 23, a rolling bearing such as a ball bearing is used.
As the rolling bearing, a dustproof and waterproof type is used. As for the lower roller 21, the power transmission member 24 is attached to the roller shaft 201.

The roller body 202 has a cylindrical hollow structure in order to reduce the weight, and is fixed to the roller shaft 201 via the left and right end plate portions 203.
As shown in FIG. 3, it is preferable to provide an anti-slip projection or groove anti-slip pattern 204 on the surface of the roller main body 202. This anti-slip pattern 204 is a pattern in which inclined lines 205 formed by protrusions or grooves that gradually incline backward in the rotation direction toward the left and right ends with respect to the center line in the conveyance direction are arranged at predetermined intervals in the rotation direction. Thus, in the illustrated example, they are provided symmetrically with respect to the center line N. The inclined line 205 is not limited to a straight line, and may have a curved configuration.

The belt 30 sags in the direction in which the belt 30 sinks in the center due to the weight of snow. By providing such an anti-slip pattern 204, not only the anti-slip but also in the direction of pulling to the left and right with respect to the belt 30 during conveyance. Force is applied, and it can be transported with tension left and right.
In addition, a tilting portion 206 that protrudes in a flange shape is provided at both ends of the roller main body 202 so as to regulate the right and left bias of the belt 30. The boundary between the tilting portion 206 and the cylindrical surface of the roller body 202 is an arc-shaped rounded portion 207 that guides the belt 30 back to the center when the belt 30 is shifted to the left or right. The rounded portion 207 is provided adjacent to the side position of the regular belt 30. Therefore, the greater the deviation of the belt 30 from side to side, the greater the inclination of the rounded portion 207, and the belt 30 is pushed back to the center. Further, the roller body 202 is preferably provided with a plurality of holes 208 in order to reduce the weight of the roller and drain water.
The belt 30 is made of an endless flexible material having a predetermined width, and a material that does not lose its flexibility even at low temperatures is selected so that it can be stretched sufficiently to withstand the weight of snow. The

  The fixing bolt 40 is fixed to the roof 100 in an upright state. A through hole 121 is provided in the roof 100, and a bolt shaft 41 is passed through the through hole 121 from the back side of the roof 100. The roof 100 is tightened by the roof fixing nut 43 screwed onto the roof 100, and the fixing bolt 40 is firmly fixed to the roof 100. A through-hole 121 opened in the roof 100 and a roof material such as tiles on the roof surface are penetrated from the roof to the attic, and the entire roof cross section is penetrated. As shown in FIG. 1B, the caulking agent 46 is sealed in the gap between the bolt shaft 41 and the through hole 121, and the caulking agent 47 is covered so as to cover the roof fixing nut 43 fixed to the roof 100. And cover the bolt cap 48 to secure the seal.

Thus, the support frame 10 is fixed using the bolt shaft 41 fixed to the roof 100. The support frame 10 is fixed by providing a plurality of mounting holes through which the bolt shaft 41 is inserted at appropriate positions of the vertical frame 11 and the horizontal frame 13, and upper and lower frame fixing nuts screwed to a predetermined height of the bolt shaft 41. The vertical frame 11 and the horizontal frame 13 are clamped and fixed by 44 and 45 from above and below. Thereby, the support frame 10 becomes an integral structure with the roof.
In this embodiment, the roller position adjusting mechanism 50 adjusts the position of the lower roller 21. That is, the lower roller 21 is supported by the support frame 10 so as to be movable by a predetermined amount in the front-rear direction in a direction parallel to the roof gradient. That is, a slide guide 51 is fixed to the end of the eaves side of the vertical frame 11, and a bearing 23 that supports the shaft end of the roller shaft 201 of the lower roller 21 is slidable in a direction parallel to the gradient of the roof. It is assembled to. The bearing 23 is held by a bearing holder (not shown) and is movably supported by the slide guide 51.

The slide guide 51 is provided with a position adjusting screw 52 that adjusts the longitudinal position of the shaft end of the lower roller 21. Various types of adjustment mechanisms using the position adjustment screw 52 can be employed.
For example, as shown in FIG. 4A, the position adjusting screw 52 is screwed into an end plate portion 511 on the upper roller side of the slide guide 51 fixed to the vertical frame 11, and the tip is the shaft end of the lower roller 21. It is set as the structure contact | abutted to movable parts 53, such as a bearing or a bearing holder. Since the lower roller 21 is applied with a force in a direction approaching the upper roller 22 (a direction in which the roller interval is narrowed) by the tension of the belt 30, the movable portion 53 at the shaft end of the lower roller 21 is the tip of the position adjusting screw 52. The position adjustment screw 52 is tightened to move the shaft end of the lower roller 21 away from the upper roller 22 by the tip of the position adjustment screw 52, and the position adjustment screw 52 is loosened to lower the position adjustment screw 52. The shaft end of the roller 21 can be moved in a direction approaching the upper roller 22.

As shown in FIG. 4, the position adjustment screw 52 is supported so as not to move in the axial direction with respect to the slide guide 51 but to be rotatable in the rotational direction. It may be configured to be screwed to 53. In this way, by rotating the position adjusting screw 52, the movable portion 53 that is screwed to the screw shaft 521 moves back and forth.
However, the present invention is not limited to such a configuration, and the position adjusting screw 52 may be screwed from the end surface on the tip end side (on the opposite upper roller side) of the slide guide 51 and screwed to the movable portion 53. It is possible to adopt a configuration.

As shown in FIG. 4C, the tension adjusting mechanism 60 is not tensioned on the belt return surface 32 after conveyance, that is, on the lower surface side of the endless belt 30, instead of the conveyance surface 31 positioned on the upper surface of the belt 30. The structure includes a tension roller 61 as a member and an adjustment plate 62 that fixes the axial end of the tension roller 61 so that the position of the shaft can be adjusted in the vertical direction. In the illustrated example, it is disposed in the vicinity of the large-diameter lower roller 21. At the same time as the tension is applied by the tension roller 61, the belt 30 and the gutter 110 or the tip of the eaves are prevented from interfering with each other.
The tension roller 61 is a small-diameter roller, and the shaft end surface of the roller shaft is fixed by a set screw 63 through a long hole 621 provided in the adjustment plate 61. The adjustment plate 62 is a plate material that extends in the vertical direction and is positioned on the extended surface of the shaft end surface of the roller shaft, and has an upper end fixed to the vertical frame 11 of the support frame 10. For example, the tension roller 61 may be configured such that the roller body is rotatable with respect to a roller shaft fixed to the adjustment plate 62.
The tension adjusting mechanism 60 is not limited to the configuration shown in FIG. 4C. For example, as shown in FIG. 4D, a movable portion 63 that supports the tension roller shaft 61 by a bolt 64 is provided. You may make it move to an up-down direction, and can employ | adopt other various structures.

Further, as shown in FIGS. 1, 2, and 5 (A), side walls 70 are provided on the left and right side edges of the belt 30. The side wall 70 serves to block the space between the conveying surface 31 and the return surface 32 of the belt 30 and between the return surface 32 of the belt 30 and the roof, and prevent snow and wind from entering.
Furthermore, as shown in FIG. 5A, a snow scraping member 80 is provided to scrape off the snow attached to the surface of the belt 30. It is effective to provide the position of the snow scraping member 80 at the end portion of the transport surface 31 in the transport direction, that is, the portion where the belt 30 turns downward by the lower roller 21. But you may make it contact | abut to the return surface 32 of the belt 30 after direction change. When it is brought into contact with the return surface 32, it is possible to prevent the belt from sagging. The snow scraping member 80 may have a scraper shape or a rod shape, and the shape is not limited.

  Further, it is preferable that a support member that supports a snow load accumulated on the conveyance surface 31 is disposed between the conveyance surface 31 and the return surface 32 of the belt 30. The support member preferably has a round contact surface so that the belt 30 is not damaged. For example, a round bar 91 or a corrugated plate 92 made of polycarbonate as shown in FIGS. Is preferred. Such round bars 91 and corrugated plates 92 are fixed to the support frame 10.

Moreover, you may provide the sensor stand 95 for detecting the snow cover amount with a snow cover sensor (refer FIG. 1). In the example of illustration, the example arrange | positioned at the front-end | tip part of the support frame 10 is shown. The sensor table 95 is short in the conveying direction of the belt 30 and is a base plate full of the width of the belt 30 and detects the amount of snow accumulated on the sensor table 30. As the snow cover sensor, various known sensors such as a sensor that detects weight, a sensor that uses infrared rays, a sensor that detects temperature, and the like can be used. When detecting the weight, a detection element such as a weight sensor may be used, or when the snow on the detection table reaches a predetermined amount, the weight will fall down and the switch will be switched on, and the detection table where the snow has fallen will rise again It is good also as a typical structure.
When the amount of snow reaches a predetermined amount, in the case of electric drive, the motor automatically rotates to drive the belt 30, carrying the snow accumulated on the belt 30 to the eaves and dropping it under the eaves. Further, while the belt 30 is rotating, it may be indicated by a warning lamp or the like that the snow is being lowered. In the case of this electric drive, it is not always automatically operated by a signal from the sensor, but can be operated by a manual switch. It is also possible to switch between manual and automatic.

When the belt 30 is driven manually, it is preferable to display a signal such as a warning lamp or a warning buzzer according to a signal from the snow accumulation sensor.
When the sensor table 95 is disposed at the tip of the support frame 10, the snow accumulated on the sensor table 95 is pushed out by the snow conveyed by the belt, and the snow that has fallen down slides on the sensor table 95. The amount remaining on the table is small and does not malfunction. Of course, the position of the sensor table 95 is not particularly limited to the tip of the support frame, and may be arranged on the side of the belt. Further, the snow itself on the belt may be detected without particularly arranging the sensor base. Furthermore, you may arrange | position on the grounds, such as a garden tip, not on a roof. When placed on the ground, the housekeeper can check it.

The above-described snow lowering device does not cover the entire surface of the roof 100, but secures a work passage space 130 on the roof 100 adjacent to the snow lowering device as shown in FIG. When the roof is wide, it is installed at a plurality of places with a work passage space 130 therebetween. Without the work passage space 130, installation is difficult, and even if installed, maintenance is not easy. Since the belt 30 is exposed to severe conditions, deterioration is inevitable, and maintainability is an important factor.
This snow removal device can be operated both electrically and manually.
In the case of electric drive, for example, when the lower roller is driven, a belt, a chain, or the like can be wound around a pulley and a chain sprocket fixed to a driving shaft of a motor arranged on the ground and driven by the motor. The snow lowering apparatus 1 installed in a plurality of places can be driven in synchronization with one motor by fixing a power transmission member corresponding to one driving shaft arranged on the ground, for example. But you may make it drive each snow removal apparatus independently.

In the case of manpower, for example, the lower roller may be rotated by using a pulley, or the operation unit such as a lever or a handle and the power transmission member of the lower roller may be operatively connected to rotate.
In the case of electric drive, the upper roller may be driven. In this case, the motor is arranged on the roof, but it can be driven efficiently with little power loss.
When not in use, it is preferable to provide a stopper mechanism so as not to rotate. As the stopper mechanism, in the case of an electric motor, since the motor is stopped, the motor itself can be a stopper mechanism. In the case of automatic operation, the sensor may not be operated.
With respect to the fixing bolt 40 of the support frame of the snow lowering device of the present invention, if the tip of the bolt shaft 41 of the fixing bolt 40 is sharpened as shown in FIG. 5 (E), the roof is damaged due to disasters such as earthquakes and typhoons. It can be used for fixing the sheet when the sheet 140 is covered. That is, if the sheet 140 is inserted into the fixing bolt 40 and tightened with the nut 49, the sheet can be easily and firmly fixed, and is not blown off under strong wind.

FIG. 1 (A) is a schematic side view showing a part of the snow lowering device according to the embodiment of the present invention, and FIG. 1 (B) is a schematic enlarged cross-sectional view of the roof fixing portion of the fixing bolt in FIG. 1 (A). FIG. FIG. 2 is a schematic plan view in which a part of the snow removal device of FIG. 1 is omitted. FIGS. 3A and 3B show a belt winding roller used in the snow lowering apparatus of FIG. 1, wherein FIG. 3A is a front view and FIG. 3B is an enlarged view of a round portion. 4A and 4B are diagrams showing a configuration example of the roller position adjusting mechanism of the apparatus of FIG. 1, and FIGS. 4C and 4D are diagrams showing a configuration example of the tension applying mechanism of the apparatus of FIG. It is. 5A is a simplified side view of the apparatus shown in FIG. 1, and FIGS. 5B and 5C are views showing a configuration example of a support member for supporting a load acting on the belt. FIG. 1 is a view showing an example of arrangement of the apparatus of FIG. 1 on the roof, and FIG. 2E is a view showing a tip portion of a fixing bolt having a pointed tip.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Support frame 11 Vertical frame, 12 Reinforcement material, 13 Horizontal frame 20 Roller 201 Roller shaft, 202 Roller main body, 203 End plate part,
204 Non-slip pattern 205 Inclined line 206 Tail part, 207 R part 208 Hole N Center line 21 Lower roller 22 Upper roller 23 Bearing 24 Power transmission member 30 Belt 31 Conveying surface, 32 Return surface 40 Fixing bolt 41 Bolt shaft, 42 Bolt head Part, 43 roof fixing nut,
44, 45 Frame fixing nut 46 Caulking agent, 47 Caulking agent, 48 Bolt cap 50 Roller position adjustment mechanism 51 Slide guide 511 End plate part 52 Position adjustment screw 521 Screw shaft 53 Movable part 60 Tension adjustment mechanism 61 Tension roller, 62 Adjustment plate, 621 Long hole 63 Set screw 70 Side wall 80 Snow scraping member 91 Round bar, 92 Corrugated plate, 95 Sensor base 100 Roof, 110 Gutter, 120 Roof plate 121 Through hole,
130 Working passage

Claims (23)

In a snow lowering device that removes snow from the roof by a belt that rotates the snow accumulated on the roof,
A support frame attached to the roof;
A pair of upper and lower rollers rotatably supported by the support frame;
An endless belt hung between rollers;
A fixing bolt fixed upright in a through hole provided in the roof for fixing the support frame to the roof;
A roller position adjusting mechanism for adjusting the interval between the rollers;
A snow lowering device comprising a tension adjusting mechanism that applies tension to the belt.   The snow lowering device according to claim 1, further comprising a driving force transmission member that drives at least one of the rollers.   The roller has a lower roller provided on the eaves side of the roof and an upper roller provided on the upper part of the roof. The lower roller is larger in diameter than the upper roller and is disposed outside the rain gutter on the eaves of the roof. The snow lowering device according to claim 1 or 2, wherein the snow lowering device covers a reed.   The roller includes a roller shaft that is rotatably supported by a support frame via a rolling bearing, and a roller body that is fixed to the roller shaft. The roller body surface has anti-slip protrusions or grooves to prevent slipping. The snow lowering device according to any one of claims 1 to 3, wherein a pattern is provided. The anti-slip pattern is a pattern in which inclined lines formed by protrusions or grooves that gradually incline backward in the rotation direction toward the left and right ends with respect to the center line in the transport direction are arranged at predetermined intervals in the rotation direction. The snow lowering device according to claim 4, which is provided symmetrically with respect to the center line in the illustrated example. 6. The snow lowering device according to claim 4 or 5, wherein a tilting portion projecting in a flange shape is provided at both ends of the roller body, and the right and left bias of the belt is restricted.   The snow lowering device according to claim 6, wherein a boundary portion between the tilt portion and the cylindrical surface of the roller body is an arc-shaped round portion. The snow lowering device according to any one of claims 4 to 7, wherein the roller body has a cylindrical hollow structure and is provided with a plurality of holes for reducing the weight of the roller and draining water.   The snow lowering device according to claim 1, wherein a tip of the fixing bolt is pointed.   The snow lowering device according to claim 1 or 9, wherein a gap between the fixing bolt and the through hole is sealed with a caulking agent.   The roller position adjusting mechanism adjusts the position of the roller, and the driving roller is supported so as to be movable by a predetermined amount back and forth in a direction parallel to the gradient of the roof with respect to the support frame. Snow removal equipment. A slide guide is fixed to the end portion of the eaves side of the support frame, and a bearing that supports the shaft end of the roller shaft of the lower roller is assembled to the slide guide so as to be slidable in a direction parallel to the gradient of the roof. The snow lowering device according to claim 11, further comprising a position adjusting screw for adjusting a front-rear position of a shaft end of the drive roller.   The snow lowering device according to claim 1, wherein the tension adjusting mechanism includes a tension member that bites into a lower surface side of the belt after the belt conveyance is finished.   The snow lowering device according to claim 13, wherein the tension member is disposed in the vicinity of the lower roller and has a structure that avoids interference with a rain gutter at the eaves of the belt or a tip of the eaves.   The snow lowering device according to claim 14, wherein the tension member is a roller, and the shaft end portion of the roller shaft is fixed by a set screw through a long hole provided in an adjustment plate fixed to the support frame. 16. Side plates are provided on the left and right side edges of the belt to block the space between the belt conveying surface and the return surface and between the belt return surface and the roof and prevent snow and wind from entering. The snow lowering device according to any one of the above.   The snow lowering device according to any one of claims 1 to 16, further comprising a snow scraping member that scrapes off snow adhering to the surface of the belt.   The snow lowering device according to any one of claims 1 to 17, wherein a support member that supports a snow load accumulated on the transport surface is disposed between the transport surface and the return surface of the belt.   The snow lowering device according to claim 1, wherein a work passage space is provided on the roof adjacent to the snow lowering device.   The snow lowering device according to claim 19, wherein the snow lowering device is installed at a plurality of locations on the roof across a work passage space.   The snow lowering device according to claim 2, wherein the power transmission member of the drive roller is connected to an electric motor and is driven electrically.   The snow lowering device according to claim 2, wherein the power transmission member of the drive roller is connected to a manual operation unit and is driven manually. The snow lowering device according to claim 21, further comprising a stopper mechanism that restricts rotation of the belt.

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