JPH0243757Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a drawing board with a parallel ruler.

(Prior art and its problems) Conventionally, this type of drawing board has a plurality of pulleys 22 provided inside a pulley support frame 21 surrounding both sides and the upper side of the drawing board 20, as shown in FIG. ，
22..., a timing rope 23 is stretched in a loop shape, and a ruler 25 is fixed to carriages 24, 24 attached to the timing rope 23. However, in a drawing board equipped with parallel rulers having such a configuration, the timing rope 23 is made of wire, so the pulleys 22, 22...
In addition to requiring at least two people and time-consuming work, it also requires adjustment of the tension, etc.
Assembly required skill. For this reason, when exporting a drawing board equipped with the above-mentioned parallel rulers using the knock-down method, for example, the complicated and skilled work of tensioning the timing rope 23 must be done on-site, making it extremely troublesome to procure workers. It was hot. In addition, when exporting the finished product, it requires extensive packaging, making it difficult to handle during transportation, and the transportation costs are high.

(Problems to be solved by the invention) The present invention has been made in view of the above points, and in particular, it is a drawing board equipped with a parallel ruler that can be assembled easily and reliably and is suitable for knock-down production. The purpose is to propose.

(Technical means to solve the problem) As a technical means to solve the above problem,
The drawing board equipped with a parallel ruler according to the present invention has a pair of first pulleys rotatably provided at both ends of the left and right sides of the drawing board, and a timing belt is stretched between each pair of first pulleys. , both ends of a ruler are attached to the parts of the timing belt that move in the same direction, and a second ruler is attached to one of the corresponding first pulleys on both the left and right sides of the drawing board
pulleys are provided, and an interlocking belt having a belt length adjustment mechanism for interlocking with both of the timing belts is removably stretched around these second pulleys,
In addition, at least one of the second pulleys has a rotation adjustment mechanism that allows it to rotate freely relative to the first pulley.

(Operations and effects of the invention) As described above, the drawing board equipped with a parallel ruler according to the invention has timing belts on each side of the drawing board, and these timing belts are operatively connected via an interlocking belt. In this configuration, first, at least one of the second pulleys is made freely movable by a rotation adjustment mechanism relative to the first pulley around which the left and right timing belts are wound. Then, tension the interlocking belt around the second pulley that is coaxial with the first pulley, adjust its length until the left and right timing belts interlock well, and place a ruler at the corresponding position of the left and right timing belts. This can be obtained by fixing the first pulley and the second pulley that was freely moving after being attached so that they interlock with each other.

Therefore, when assembling a drawing board equipped with parallel rulers configured as described above, first tension the timing belts on the first pulleys on both sides of the drawing board, and then tension the interlocking belts on the first pulleys. After adjusting the length, the process is completed by fixing the second pulley to the first pulley. All of these on-site operations do not require delicate adjustments, and assembly is simple and requires no skill. Therefore, the timing belt and the interlocking belt can be easily and reliably attached to the drawing board, and the knockdown method is very convenient for assembly production.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In the figure, reference numeral A indicates a drawing board equipped with a parallel ruler 1. This drawing board A has a pair of first pulleys 4a, 4b rotatably provided at both ends of rails 3, 3 provided on each side of the drawing board 2. Timing belts 5, 5 are stretched respectively, and both ends of the ruler 1 are attached to the parts of the timing belts 5, 5 that move in the same direction, and first pulleys corresponding to each other are attached to the left and right rails 3, 3. Second pulleys 6a and 6b are provided coaxially with the timing belts 4a and 4a, respectively, and an interlocking belt 7 having a belt length adjustment mechanism for interlocking both the timing belts 5 and 5 with these second pulleys 6a and 6b. The first pulley 4a is attached to one pulley 6a.
It is equipped with a rotation adjustment mechanism that allows it to rotate freely. Due to the interlocking belt 7, the timing belts 3 and 3 move the same amount, and the ruler 1 moves in parallel. 8 is an interlocking belt covering cover, and 9 is a pencil case.

The rails 3, 3 arranged on both sides of the drawing board 2 are formed hollow inside by extruded metal, etc., and each has a screw holder 11 provided in a dovetail groove 3a inside the rail, and a vise 10 is fixed with screws. The rails 3, 3 are fixed by tightening a vise 10 to both ends of the drawing board 2.

Next, at both ends of each rail 3, support shafts 12a,
12b is rotatably provided, and a first pulley 4 is attached to each of the pair of support shafts 12a, 12b.
a and 4b are fixed. Furthermore, a timing belt 5 is stretched around each pair of first pulleys 4a, 4b. Further, a carriage 14 is attached via a fastener 13 to the portions of the timing belts 5, 5 that move in the same direction that face both sides of the drawing board 2, and both ends of the ruler 1 are fixed to the carriage 14. ing. The carriage 14 includes a fastener 13 fixed to the timing belt 5, a carriage body 14a supported by rollers 16 provided so as to be able to roll freely on the inner wall of the roller accommodating portion 3b of the rail 3, and the carriage body 14.
It consists of a mounting bracket 15 extending from a to a.

Further, second pulleys 6a, 6b are mounted on the same support shafts 12a, 12a as the first pulleys 4a, 4a corresponding to each other in the left and right rails 3, 3, respectively.
is provided. One of the second pulleys 6b is provided integrally with the coaxial first pulley 4a. The other second pulley 6a is provided separately from the coaxial first pulley 4a.

The second pulley 6a is provided with a rotation adjustment mechanism that allows it to rotate freely relative to the first pulley 4a. That is, the second pulley 6a is loosely fitted onto the support shaft 12a, and a through hole 17 with a threaded groove is provided on the side of the second pulley 6a. By loosening or tightening the screw 18 screwed into the through hole 17, its tip is separated from or pressed against the surface of the support shaft 12a, and the second pulley 6a can rotate independently of the support shaft 12a. or the support shaft 12a
Fixed.

The interlocking belt 7 adjusted by the second pulleys 6a and 6b has a length adjustment mechanism using the turnbuckle principle, and its length can be arbitrarily adjusted by turning an adjustment member 19.

Next, since the drawing board A having the above configuration is configured as described above, first, the rails 3, 3 on which the timing belt 5 is stretched can be easily fixed to the drawing board 2 with a vise 10. Can be done. In addition, when tensioning the interlocking belt 7, one of the second pulleys 6
After loosening the screw 18 of a to enable free movement with respect to the support shaft 12a, the interlocking belt 7 is wound around the second pulley 6a and the other second pulley 6b, and the timing belt 5,5
After adjusting the length of the carriages 14, 14 attached to the left and right timing belts 5, 5 to the extent that they interlock well, and aligning the carriages 14, 14 attached to the left and right timing belts 5, 5 to the same position, the first pulley 4
Tighten the screw 18 of the second pulley 6b, which was freely moving with the first pulley 4a, and fix it so that it moves in conjunction with the first pulley 4a.Finally, both ends of the ruler 1 are fixed to the carriages 14, 14. It can be assembled by twisting it.

In this way, the length of the interlocking belt 7 can be adjusted by the length adjustment mechanism, and the interlocking of the left and right timing belts 5, 5 can be easily adjusted by the rotation adjustment mechanism. It's easy,
Assembly work is easy, and drawing boards can be easily assembled and produced using the knock-down method.

In addition to the above-mentioned example, the rotation adjustment mechanism for the second pulley 6a may be configured to engage and disengage the second pulley 6a and the first pulley 4a, or to adjust the rotation of both pulleys 6a.
It may also be configured such that the opposing end surfaces of a and 4a are pressed and separated.

[Brief explanation of the drawing]

Figure 1 is a front view of a drawing board equipped with a parallel ruler according to the present invention, Figure 2 is a sectional view showing the main parts of the drawing board in Figure 1, and Figure 3 is a view of the main parts of the drawing board from the back side. FIG. 4 is a front view of the conventional example. Code, A... Drawing board, 1... Ruler, 2... Drawing board, 3... Rail, 4a, 4b... First pulley, 5... Timing belt, 6a, 6b... Second pulley, 7...Interlocking belt, 10...Vise,
12a, 12b...support shaft, 14...carriage, 17...through hole, 18...screw.

Claims (1)

[Scope of utility model registration request] A pair of first pulleys are rotatably provided at both ends of the left and right sides of the drawing board, a timing belt is stretched between each pair of first pulleys, and a ruler is attached to the portion of the timing belt that moves in the same direction. At the same time, a second pulley is provided on each of the first pulleys corresponding to each other on both the left and right sides of the drawing board, and a belt length is provided for making these second pulleys interlock with both of the timing belts. A parallel ruler is provided, wherein an interlocking belt having a height adjustment mechanism is removably stretched, and at least one of the second pulleys has a rotation adjustment mechanism that allows free rotation with respect to the first pulley. drawing board.