JPH0715396U - Vertical rail support device for drafting machine - Google Patents

Abstract

(57) [Summary] [Purpose] Eraser residue is prevented from adhering to the surface of the guide roller or the surface of the drawing board. [Structure] The vertical rail 13 is movably provided along a horizontal rail fixed to the upper edge of the drawing board 11. A vertical rail support mechanism 41 having a guide roller 49 is provided at the lower end of the vertical rail 13. The vertical rail 13 travels smoothly on the upper surface of the drawing board 11 by the guide roller 49. On the surface of the guide roller 49, a spiral groove 4 extending substantially in the circumferential direction.
9a and the protrusion 49b are formed. The eraser debris is cut by the protrusion 49b, and the amount of the eraser debris attached to the surface of the guide roller 49 or the surface of the drawing board 11 is greatly reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a rail type drafting machine, and more particularly to a vertical rail support device movably mounted on the upper surface of a drawing board.

[0002]

[Prior art]

 Conventionally, a rail type drafting machine is provided with a vertical rail to which a scale is attached, and the vertical rail is supported by a horizontal rail fixed to the upper edge of the drawing board so as to be movable laterally. A guide roller is rotatably provided at the lower end of the vertical rail, and the vertical rail smoothly travels on the drawing board by the guide roller.

When an operator uses an eraser on a drawing board, eraser residue is generated. When the eraser dust comes into contact with the running guide roller, it is compressed by the guide roller and adheres to the surface of the guide roller or the surface of the drawing board. As a result, the surface of the drawing board is soiled or the guide roller is prevented from smoothly running on the surface of the drawing board. There is also a problem that vibration and noise increase when the vertical rail moves.

As a device for solving these problems, a vertical rail supporting device disclosed in Japanese Utility Model Laid-Open No. 3-126694 is known. That is, the traveling rail is arranged at the lower edge of the drawing board, two ridges are formed on the upper surface of the traveling rail, and the distance between the two ridges is set to be narrower than the width of the guide roller. ing. The guide roller runs on the two ridges, and the eraser dust is finely cut by the guide roller and the tip of the ridge. Therefore, the eraser residue is prevented from adhering to the surfaces of the guide rollers and the traveling rails.

[0005]

[Problems to be solved by the device]

 However, since the rail member in such a vertical rail support device has a length corresponding to the running distance of the vertical rail at the lower edge of the drawing board and a ridge extending in the longitudinal direction is formed, the vertical rail support device is There is a problem that the configuration of the device becomes complicated and costly.

The present invention solves the above problems, and provides an inexpensive vertical rail support device in which eraser debris does not easily adhere to the surface of the guide roller or the surface of the drawing plate and has a simple structure. The purpose is to

[0007]

[Means for Solving the Problems]

 The vertical rail support device according to the present invention is provided with a vertical rail movably provided parallel to the drawing board, and is rotatably attached to the vertical rail and abutted on the drawing board to be mounted on the vertical rail. A guide roller for guiding movement is provided, and a groove extending in the circumferential direction is provided on the surface of the guide roller.

[0008]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 shows a rail type drafting machine according to an embodiment of the present invention. A horizontal rail 12 is fixed to the upper edge of the drawing board 11, and a joint case 14 is movably attached to the horizontal rail 12. The upper end of the vertical rail 13 is fixed to the joint case 14, and the lower end of the vertical rail 13 is provided with a vertical rail support mechanism described later. The guide rails provided on the vertical rail support mechanism allow the vertical rail 13 to smoothly travel on the upper surface of the drawing board 11. That is, the vertical rail 13 can travel along the horizontal rail 12 in parallel with the drawing board 11.

The moving member 22 is movably supported along the vertical rails 13, and a connecting member 23 is connected to the moving member 22. The fine movement lever 24 is provided on the connecting member 23, and by rotating the fine movement lever 24, the connecting member 23 rotates a small amount around a predetermined point of the moving member 22. The handle 25 is connected to the connecting member 23, and an L-shaped scale attachment plate 29 is attached to the handle 25 so as to be rotatable around a pin 25 a of the handle 25. Further, the handle 25 is provided with a degree lever 27 and an index lever 28. The scale mounting plate 29 is fixed at any position by operating the protractor lever 27, and is fixed at every 15 ° position by operating the index lever 28. The rotation angle of the scale mounting plate 29 is indicated by the protractor 25b. A vertical scale 31 and a horizontal scale 32 are vertically provided on the scale mounting plate 29 via screws 33 and 34, respectively. The vertical scale 31 and the horizontal scale 32 are attached to the scale mounting plate 29 at respective mounting positions. It is adjusted by the adjusting knobs 35 and 36.

2 and 3 are a side view and a sectional view of the vertical rail support mechanism 41, respectively. A horizontal plate portion 42a and a vertical plate portion 42b are formed on the L-shaped plate member 42. The horizontal plate portion 42a is fixed to the lower surface of the vertical rail 13 via a screw 43. A roller support member 44 is inserted into a hole (not shown) of the vertical plate portion 42b, and a nut 46 is screwed to a protruding portion 44a of the roller support member 44 from the vertical plate portion 42b, whereby a roller support member 44 is formed. Is fixed to the vertical plate portion 42b. A screw hole 44b is formed in the roller support member 44, and a screw 48 is screwed into the screw hole 44b. An inner race 47a of a ball bearing 47 is fitted to the screw 48, and the inner race 47a is sandwiched between the tip of the roller support member 44 and the head 48a of the screw 48. A guide roller 49 is fitted on the outer peripheral side of the outer race 47b of the ball bearing 47, and the guide roller 49 is placed in contact with the drawing board 11. The guide roller 49 smoothly rotates around the roller support member 44 and the screw 48 by the action of the ball bearing 47, and guides the horizontal movement of the vertical rail 13.

On the surface of the guide roller 49, a spiral groove 49a extending substantially in the circumferential direction and a protrusion 49b are formed. In the cross section of the guide roller 49, the groove 49a is formed in a U-shape, and the tip of the protrusion 49b is flat. Both ends of the spiral groove 49a are open inside and outside the guide roller 49 (see symbol A).

Next, the operation of the present invention will be described. When the handle 25 is moved in any direction horizontal to the drawing board 11, the vertical rail 13 moves along the horizontal rail 12 and the moving member 22 moves along the vertical rail 13. As a result, the handle 25 can be moved to any position on the drawing board 11. With the movement of the vertical rail 13 along the horizontal rail 12, the guide rollers 49 rotate around the upper surface of the drawing board 11 to travel and guide the movement of the vertical rail 13.

Since the figure board 11 is usually installed so as to be inclined so that the lower side is lower than the upper side, for example, eraser residue generated on the figure board 11 is likely to move downward. When the eraser debris comes into contact with the surface of the traveling guide roller 49, the erased debris is finely cut by the protrusion 49b and remains on the drawing board 11 or enters the groove 49a. In the former case, since the groove 49a is formed in a spiral shape, while the guide roller 49 travels back and forth on the surface of the drawing board 11, the eraser debris is again finely cut by the projection 49b, and There is no excitement on 11th. In the latter case, the eraser can be easily discharged from the inner or outer end where the groove 49a is open.

As described above, according to the present embodiment, the amount of eraser debris attached to the surface of the guide roller 49 or the surface of the drawing plate 11 is significantly reduced. Therefore, the surface of the drawing board 11 is prevented from being contaminated by erased gum residue, the movement of the vertical rails 13 along the horizontal rails 12 is made smooth, and vibrations and noises during traveling are reduced. Further, since the groove 49a is formed in a spiral shape, the eraser residue that has entered the groove 49a is easily discharged, and the buildup of dirt due to the eraser residue generated on the board 11 is reduced.

The groove 49a does not have to be spiral, and a plurality of mutually parallel grooves 49c may be formed on the outer peripheral surface of 49 as shown in FIG. Furthermore, the cross-sectional shape of the protrusion 49b may be formed in a triangular shape or a semicircular shape so that the contact surface of the tip of the protrusion 49b with the drawing plate 11 is made small, which increases the effect of cutting the eraser residue.

Further, a traveling rail having no protrusion, that is, a flat traveling rail, may be provided at a position where the guide roller 49 travels.

[0017]

[Effect of device]

 As described above, according to the present invention, it is possible to obtain an inexpensive vertical rail support device in which eraser dust is unlikely to adhere to the guide roller and the drawing board and has a simple structure.

[Brief description of drawings]

FIG. 1 is a plan view showing a drafting machine having a vertical rail support device according to a first embodiment of the present invention.

FIG. 2 is a side view of a vertical rail support mechanism.

FIG. 3 is a sectional view of a vertical rail support mechanism.

FIG. 4 is a side view of a guide roller provided in the vertical rail support device of the second embodiment.

[Explanation of symbols]

 11 Drawing Board 13 Vertical Rail 41 Vertical Rail Support Mechanism 49 Guide Roller 49a Groove

Claims (2)

[Scope of utility model registration request] 1. A vertical rail movably provided parallel to a drawing plate, and rotatably attached to the vertical rail and abuttingly mounted on the drawing plate to guide movement of the vertical rail. A vertical rail support device for a drafting machine, characterized in that a groove extending in a circumferential direction is provided on a surface of the guide roller. 2. The vertical rail support device according to claim 1, wherein the groove has a spiral shape.