JPH0714603Y2 - Belt tension adjustment device for automatic doors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a belt tension adjusting device for moving a door in an automatic door.

(Prior Art) In an automatic door, pulleys are installed on the left and right sides of the door frame, and the door is connected to an endless belt hung on the pair of pulleys so that the door opens and closes as the belt moves. If the tension of the belt is not proper, the door may not be closed sufficiently or the belt may be damaged.

In order to solve this problem, the invention described in Japanese Patent Publication No. 56-2190 has been made. As shown in FIG. 4, the present invention includes a driven attachment plate 51 attached to a door frame 50 and a driven pulley.
A pulley mounting plate 53 provided with 52 is mounted so as to be movable in the horizontal direction, and a compression spring 54 is interposed between the projecting plate 51a of the driven mounting plate 51 and the projecting plate 53a of the pulley mounting plate 53. The short adjustment screw 55 screwed to the projecting plate 51a and the nut 56 compress the pulley mounting plate 53 so that the pulley mounting plate 53 can be moved in the belt tension direction, thereby giving an appropriate tension to the belt.

In addition, in Japanese Utility Model Publication No. 61-20950, as shown in FIG.
The fixed base 61 fixed to the substrate 60 and the slide base 63 that is provided with the driven pulley 62 and is movably attached to the fixed base 61 are provided with projecting pieces 61a and 63a on the side opposite to the driven pulley. The adjusting bolt 65 screwed into the female screw hole 61b of 61a is inserted into the through hole 63b of the protruding piece 63a, and the compression spring 64 is provided between the double nut 66 screwed into the tip of the adjusting bolt 65 and the protruding piece 63a. There has been proposed a belt tension adjusting device that compresses the compression spring 64 by rotating the bolt head of the adjusting bolt 65 to move the adjusting bolt 65.

(Problems to be solved by this device) However, in the conventional tension adjusting device as described above,
As shown in FIG. 4, the inner side of the driven pulley 52 (on the central side of the door)
In order to provide the compression spring 54 at a short distance between the projecting plate 51a of the driven mounting plate 51 and the projecting plate 53a of the pulley mounting plate 53, the driven pulley 62 and the slide base 63 as shown in FIG.
Since the compression spring 64 is provided between the projection 63a and the projection 63a, the compression spring cannot be shortened, and it is necessary to use a compression spring having a large spring constant in order to apply a large tension, and the compression spring is compressed. Since the force becomes large, the operation force of the adjusting screw 55 or the adjusting bolt 65 becomes large, and the tension is greatly changed due to the minute displacement, which makes it difficult to adjust the tension.

For example, in FIG. 5, if a long compression spring is to be used, the distance between the driven pulley 62 and the protruding piece 63a must be increased, and the fixed base 61 inevitably becomes large. Large displacement inside the eyes (center side of the door) makes it impossible to increase the opening width of the automatic door.

Further, in the tension adjusting device of FIG. 5, the adjusting bolt 65 has the protruding piece 61.
Since it is screwed into the female screw hole 61b of a, when the adjustment bolt 65 is rotated during tension adjustment, the bolt head moves horizontally, and there is no standard for applying a spanner, which makes adjustment work difficult. is there.

An object of the present invention is to provide a belt tension adjusting device for an automatic door, which can easily adjust the tension of the belt and constantly applies proper tension to the belt.

(Means for Solving Problems) A tension adjusting device for an automatic door according to the present invention includes a drive pulley 1 and a driven pulley 2 on the upper frame of the door frame A or on the left and right sides without eyes.
In the automatic door in which the endless belt 3 is attached to these pulleys and the door 4 connected to the belt 3 is movable, a case 6 having a space for disposing the tension adjusting member inside is fixed to the door frame A. Then, an adjusting plate 9 to which the driven pulley 2 is attached is movably attached to a side surface of the case 6 opposite to the side where the case 6 is attached to the door frame A, and one end of the case 6 opposite to the drive pulley 1 side is attached. A mounting member 7 having a bolt insertion hole 8 is provided in a protruding manner, and a moving member 18 having a hole 19 in which a female screw is screwed is arranged in the case 6 so as not to rotate and movable in the horizontal direction. The adjusting plate 9 is provided between the portion 7 and the moving member 18.
The bearing portion 15 is located, the spring 20 is interposed between the bearing portion 15 and the moving member 18, and the bolt 17 is inserted into the bolt insertion hole 8 of the mounting portion 7 and the bolt insertion hole 16 of the bearing portion 15. Then, the spring which acts on the belt 3 is screwed into the moving member 18 and the bolt head of the bolt 17 locked to the mounting portion 7 is rotated to move the moving member 18 in the case 6.
The urging force of 20 can be adjusted.

(Operation) In the configuration as described above, the adjusting plate 9 to which the driven pulley 2 is mounted is mounted to the mounting plate 5 of the door frame via the case 6, and the inside of the driven pulley 2 (on the mounting plate 5 side of the door frame). The case 6 is located in the case 6, and the bolt 8, the moving member 18, and the spring 20 are arranged in the case 6. Therefore, the long spring 20 can be used without increasing the size of the attachment member of the driven pulley 2 to the door frame A, and the operation force of the bolt 8 becomes small, so that the tension adjusting action can be easily performed. The tension can be finely adjusted very easily.

When the bolt head of the bolt 17 is rotated by a spanner or the like, the moving member 18 that is the nut member moves in the case, and the moving pressure of the spring 20 is adjusted by the movement of the moving member 18. Since the bolt 17 is inserted through the bolt insertion hole 8 of the mounting portion 7 and the bolt insertion hole 16 of the bearing portion 15 and is urged toward the moving member 18 by the spring 20, the bolt head is engaged with the mounting portion 7. Since it is stopped, the position of the bolt head does not always change during adjustment, and bolt rotation work becomes easier.

(Embodiment) Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

In the figure, A is a door frame, and a drive pulley 1 and a driven pulley 2 are disposed on the upper frame or the left and right end portions of the eyeglass. The drive pulley 1 is rotated by a motor that is a drive source, and the driven pulley 2 is rotatably supported. An endless belt 3 is hung on the drive pulley 1 and the driven pulley 2, and a door 4 connected to the belt 3 is attached to the belt 3.
It is possible to move with the movement of.

In the figure, B is a tension adjusting device according to the present invention, and a driven pulley 2 is attached to the tension adjusting device B.

Reference numeral 5 denotes a mounting plate which is fixed to the upper frame of the door frame A or invisible. A case 6 having a rectangular cross section bent by a metal plate is attached to the attachment plate 5. At one end of the case 6, a mounting portion 7 is formed which is bent at a right angle and stands up so as to be orthogonal to the longitudinal direction of the case 6. A bolt insertion hole 8 is formed in the mounting portion 7.

An adjusting plate 9 is attached to the side surface of the case 6 so as to be movable in the horizontal direction. A shaft 10 is fixed to the adjusting plate 9 by a bolt 11, and a driven pulley 2 is rotatably attached to the bolt 11 via a bearing. The adjusting plate 9 is formed with a plurality of long holes 12 which are long in the horizontal direction, and the screws 13 are screwed into the case 6 through the long holes 12, and a washer 14 is interposed between the screw 13 and the adjusting plate 9 to adjust the screw. The plate 9 is movable in the horizontal direction. A pressure bearing portion 15 is formed at one end of the adjusting plate 9 and is bent at a right angle toward the mounting plate 5. A bolt insertion hole 16 is formed in the pressure bearing portion 15.

A long bolt 17 is inserted through the bolt insertion hole 8 of the mounting portion 7 of the case 6 and the bolt insertion hole 16 of the pressure bearing portion 15 of the adjusting plate 9 in the case 6 in parallel with the moving direction of the door 4. At the tip of the bolt 17, a moving member 18 having a hole 19 having a female screw threaded on the inner peripheral surface thereof and having a shape substantially the same as the inner peripheral shape of the case 6 is screwed into the hole 19. It is fitted and installed. Therefore, when the bolt 17 is rotated, the moving member 18 can move in the longitudinal direction of the bolt 17.

A spring 20 is provided on the outer periphery of the bolt 17 between the bearing 15 of the adjusting plate 9 and the moving member 18.

Belt 3 by the tension adjusting device having the above configuration
The adjustment work of the tension of will be described.

When increasing the tension of the belt 3, the bolt 17 is rotated to draw the moving member 18 toward the bearing 15 side. The spring 20 is compressed to press the adjusting plate 9 away from the drive pulley 1. The adjusting plate 9 is movable in the horizontal direction and increases the tension of the belt 3.

To reduce the tension of the belt 3, the bolt 17 may be rotated in the opposite direction to reduce the biasing force acting on the bearing portion 15 of the spring 30.

(Effect of the Invention) In this invention, a long bolt is inserted into a case, and a moving member having a hole in which an internal thread is screwed on an inner peripheral surface is horizontally movable in the case and cannot be rotated. A spring is interposed between the bearing member of the adjusting plate, which is housed and screwed with the bolt, is horizontally movable, and has a driven pulley, and the moving member, and the biasing force of the spring acting on the belt is applied. It is adjustable.

Therefore, since the tension is applied to the belt by the long spring, the operation force of the bolt becomes small and the tension can be easily adjusted. Fine adjustment of the tension is extremely easy and a constant tension can be always applied to the belt.

In addition, the long bolt has the advantage that the bolt head is locked to the mounting portion of the case, the bolt head position does not move unlike the conventional bolt, and the bolt rotating work becomes easy.

[Brief description of drawings]

1 is a transverse sectional view of an embodiment of a tension adjusting device according to the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is a front view of an automatic door, and FIG. 4 is a front view showing a conventional tension adjusting device. 5 and 5 are partial cross-sectional plan views showing another conventional tension adjusting device. A ... door frame, B ... tension adjusting device, 1 ... driving pulley, 2 ... driven pulley, 3 ... belt, 4 ... door, 5 ...
... Mounting plate, 6 ... Case, 7 ... Mounting part, 8 ... Bolt insertion hole, 9 ... Adjusting plate, 10 ... Shaft, 11 ... Bolt, 12 ...
… Long hole, 13 …… Screw, 15 …… Bearing part, 16 …… Bolt insertion hole, 17 …… Bolt, 18 …… Movement member, 20 …… Spring.

Claims (1)

[Scope of utility model registration request] 1. A drive pulley 1 and a driven pulley 2 are attached to the upper frame of the door frame A or to the left and right sides of an unlined eye, and an endless belt 3 is hung on these pulleys to make a door 4 connected to the belt 3 movable. In an automatic door, a case 6 having a space for arranging a tension adjusting member inside is fixed to a door frame A, and a driven pulley 2 is attached to a side surface of the case 6 opposite to an attachment side thereof. Adjusting plate 9
Is movably attached, and a mounting portion 7 having a bolt insertion hole 8 is projectingly provided at one end on the side opposite to the drive pulley 1 of the case 6, and a hole 19 in which a female screw is screwed is provided in the case 6. The movable member 18 is arranged so as not to rotate and movable in the horizontal direction, and the bearing portion 15 of the adjusting plate 9 is located between the mounting portion 7 and the moving member 18, and the bearing portion 15 and the moving member 18 Spring in between
The bolt 17 is inserted through the bolt insertion hole 8 of the mounting portion 7 and the bolt insertion hole 16 of the bearing portion 15 and screwed into the moving member 18 with 20 interposed therebetween, and the bolt 17 locked to the mounting portion 7 is inserted. The tension adjusting device for a belt for an automatic door, characterized in that the urging force of the spring 20 acting on the belt 3 can be adjusted by rotating the bolt head to move the moving member 18 inside the case 6. .