JP2689053B2 - Belt fixing method for parallel ruler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt fixing method for fixing a belt to a vertical cursor in a belt type parallel ruler.

[0002]

2. Description of the Related Art A belt fixing method for fixing a belt for synchronously moving a pair of vertical cursors to a vertical cursor generally uses a belt fixing tool.

[0003]

The method of using the belt fixing device for fixing the belt to the vertical cursor requires the belt fixing device to be provided separately, which is inconvenient during assembly and maintenance. It is an object of the present invention to easily fix a belt to a vertical cursor without using a belt fixing tool.

[0004]

In order to achieve the above object, the present invention provides a belt fixing method for a parallel ruler device, wherein a pair of end portions of a flat belt are fixed to a belt mounting plate provided on a vertical cursor. A belt hooking hole for receiving the end side of the flat belt is provided on the side wall of the plate, while the end side of the flat belt is bent to be doubled, and the double portion is tightened and fixed with a metal piece. From the predetermined length of the belt is extended in the folding direction, and the belt end portion is inserted into the belt hooking hole so that the folding portion of the belt is located on the load direction side of the belt. The end portion is locked inside the side wall.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below in detail with reference to embodiments shown in the accompanying drawings. In FIG. 5, reference numeral 2 is a drawing board, which is supported at a proper height from the floor surface by a support base. Vertical rails 4 and 6 of a parallel ruler are fixed to both sides of the drawing board 2. On the vertical rails 4 and 6,
As shown in FIG. 6, the belt pulleys 8, 10, 12, 14,
16, 18 are rotatably supported, and a flat belt 20 is stretched around these pulleys. Vertical cursors 22 and 24 are movably connected to the vertical rails 4 and 6 via guide rollers, respectively.

A pair of mounting ends of the flat belt 20 are fixed to the vertical cursor 22 by a fixing method described later. The vertical cursor 24 is detachably fixed to the flat belt 20 via a known clutch mechanism (not shown). Reference numeral 26 is a horizontal ruler, both ends of which are connected to the vertical cursors 22 and 24.
In the above configuration, the operator manually operates the horizontal ruler 2
When 6 is pressed along the drawing board 2 in the front-back direction of the drawing board 2,
The left and right vertical cursors 24 and 22 are guided by the flat belt 20 to move synchronously along the vertical rails 4 and 6, and the horizontal ruler 26 can be moved in parallel to a desired position on the drawing board 2. ing.

Next, the flat belt 20 which is the gist of the present invention.
A method for fixing the cursor to the vertical cursor 22 will be described. In FIG. 1, reference numeral 28 denotes a belt mounting plate having a U-shaped side surface, which is composed of a bottom wall 28a and a pair of side walls 28b and 28c. The mounting screw 30 is inserted into the hole of the one side wall 28c and the hole of the base plate 22a of the vertical cursor 22, and the side wall 28c of the mounting plate 28 is fixed to the side wall 28c by the tightening force of the nut 32 screwed into the mounting screw 30. It is detachably fixed to the substrate 22a.

On the other side wall 28b of the mounting plate 28 which is parallel to the vertical rail 6, as shown in FIG. 4, a pair of belt hooking holes 34 and 36 are communicated with the belt hooking holes 34 and 36. Guide holes 38 and 40 are formed at the upper open end of the side wall 28b. The guide holes 38, 4
0 is the belt hooking holes 34 and 3 of the flat belt 20, respectively.
6 has an inclined surface for facilitating insertion. The bottom wall 28a of the mounting plate 28 is arranged so as to be horizontal with respect to the surface of the drawing plate 2 and has the belt hooking holes 34, 36.
Are arranged on the longitudinal axis of the vertical rail 6 at appropriate intervals. As shown in FIG. 3, the pair of mounting end sides 20a, 20b of the flat belt 20 are double-folded, and the U-shaped metal pieces 42, 44 are crimped to the doubled portion by crimping. It is fixed.

Attachment ends 20a, 20b of the belt 20
Has a folded-back portion 20c which further extends a predetermined length in the folded-back direction from the fixed portion of the metal pieces 42, 44. In the above configuration, the pair of attachment end sides 2 of the flat belt 20
In order to fix 0a, 20b to the mounting plate 28, first, with the metal pieces 42, 44 positioned inside the side wall 28b, the double portion on the mounting end side 20a, 20b of the flat belt 20 is guided into the guide hole. It is manually pressed into the belt hooking holes 34, 36 from 38, 40. After that, the belt is pulled so that the end faces of the metal pieces 42 and 44 are attached to the belt engaging holes 34 and 36.
The side wall 28b around the side is abutted. The respective folded-back portions 20c on the mounting end sides 20a and 20b of the belt 20 are
The belt hooking hole 3 is positioned so as to be positioned on the load direction A, B side of the belt 20 with respect to the non-folded portion of the belt 20.
It is located at 4, 36.

Next, tension is applied to the belt 20 in the directions of arrows A and B by a known separately provided belt tension applying mechanism. The belt 20 is pulled in the load directions A and B by this tension. By the pulling force of the belt 20 in the load directions A and B, the belt hooking holes 34, 3
The non-folded portion in contact with the folded portion 20C in 6 is
Belt hook holes 34, 36 through the folded-back portion 20C.
It is pressed against the wall surfaces 34a, 36a. Therefore, the belt 20
The tensile force in the load directions A and B applied to the belt 20
The non-folded portion of the belt is protected by the folded portion 20C, and the folded portion 20c is protected by the belt hooking holes 34, 36.
It comes into pressure contact with the wall surfaces 34a, 36a of the above and receives pressure from the non-folded portion.

The folded portion 20C of the belt 20 is
It constitutes an unnecessary portion of the belt 20, and even if this portion is worn, it does not affect the power transmission function of the belt 20. Next, an embodiment in which a tension mechanism is added to the belt fixing mechanism will be described below. In FIG. 8.9, 46
Is a belt mounting plate, and one side wall 46a is detachably fixed to the substrate 22a of the vertical cursor 22 by mounting screws 48 and 50 and a nut. Guide shafts 52 and 54 are installed between both side walls 46a and 46b of the mounting plate 46. The guide shafts 52 and 54 are the slide members 5
The slide member 56 is fitted in the holes 6 and is supported so as to be movable in parallel along the guide shafts 52 and 54. A pair of mounting pins 58 and 60 are provided on the upper surface of the slide member 56 so as to project therefrom.

The side wall 46a of the mounting plate 46 and the substrate 22a
A slide screw 62 is rotatably fitted in a hole formed in the slide member, and the screw 62 is screwed into a screw hole formed in the slide member 56. The structure of the other side wall 46b of the mounting plate 46 is the same as the side wall 28 of the mounting plate 28 of the first embodiment shown in FIG.
same as b.

In the structure described above, the double portion of the pair of mounting end sides 20a, 20b of the belt 20 is inserted into the belt hooking holes 34, 36 with the folded-back portion 20c positioned in the belt load direction, and 2 Pin 5 for the heavy loop
Hook at 8,60. Next, the screw 62 for a slide is rotated using a screwdriver, and the slide member 56 is attached to the side wall 46a.
The belt 20 is tensioned in two directions A and B.

[0014]

As described above, according to the present invention, the belt can be fixed to the vertical cursor only by engaging the belt end portion with the belt hooking hole on the vertical cursor side. Therefore, the assembly and the maintenance are simple, and moreover, The folded portion of the folded belt is pressed against the locking end of the belt hooking hole to protect the non-folded portion, so that the belt can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1 is an external view of a vertical cursor.

FIG. 2 is a sectional view of a vertical cursor.

FIG. 3 is a layout view of a flat belt.

FIG. 4 is an exploded sectional view of a main part of a vertical cursor.

FIG. 5 is an external view of a belt mounting plate.

FIG. 6 is an external view of a flat belt.

FIG. 7 is an overall external view of a parallel ruler device.

FIG. 8 is an external view showing another embodiment of the vertical cursor.

FIG. 9 is a sectional view of the same.

[Explanation of symbols]

 2 Drawing board 4 Vertical rail 6 Vertical rail 8 Belt pulley 10 Belt pulley 12 Belt pulley 14 Belt pulley 16 Belt pulley 18 Belt pulley 20 Flat belt 22 Vertical cursor 24 Vertical cursor 26 Horizontal ruler 28 Belt mounting plate 30 Mounting screw 32 Nut 34 Belt Engagement hole 36 Belt engaging hole 38 Guide hole 40 Guide hole 42 Metal piece 44 Metal piece 46 Belt mounting plate 48 Mounting screw 50 Mounting screw 52 Guide shaft 54 Guide shaft 56 Sliding member 58 Pin 60 Pin 62 Screw

Claims (4)

(57) [Claims] 1. A belt fixing method for a parallel ruler device for fixing a pair of end portions of a flat belt to a belt mounting plate provided on a vertical cursor, wherein a belt for receiving an end side of the flat belt on a side wall of the belt mounting plate. While the hook hole is provided, the end of the flat belt is bent to make it double, and the double portion is clamped and fixed with a metal piece, and the folded portion of the belt is further extended in the folding direction from this metal piece for a predetermined length. The end portion of the belt is inserted into the belt catching hole so that the folded portion of the belt is located on the load direction side of the belt, and the end portion of the belt is locked inside the side wall. Belt fixing method for parallel ruler. 2. The belt fixing method for a parallel ruler device according to claim 1, wherein the belt mounting plate can be attached to and detached from the cursor. 3. The parallel according to claim 1, wherein the end surface of the metal piece is brought into contact with the inside of the side wall of the belt mounting plate to lock the end of the belt inside the side wall. Belt fixing method for ruler. 4. The end portion of the belt is hooked on a pin arranged inside the side wall of the belt mounting plate to lock the end portion of the belt inside the side wall. The belt fixing method for the parallel ruler device according to claim 1.