JPH0436957Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a paper surface piece for a drawing machine head to which a scale of a drawing machine is attached, a drawing machine head of an automatic drawing machine, etc.

[Conventional technology]

Conventionally, the bottom surface of the main body base of a head for a drafting machine makes point contact with the surface of the paper in order to reduce the sliding friction with the surface of the drawing paper and ensure smooth operability of the head of the drafting machine. A paper surface piece is provided which is formed by molding a synthetic resin and has a curved surface portion shaped like an arc.

By the way, as shown in FIG. 5, the conventional paper contact piece 1 has a cylindrical fitting part 3 provided on the back side of the contact piece main body 2, which has a flat curved surface part formed in an arc shape. The fitting part 3 is fitted into the fitting hole 5 formed in the main body base 4 constituting the head body of the drafting machine head, and heat is applied to the fitting part 3 to melt a part of it to prevent it from coming off. It is installed with care.

Alternatively, it is known that the fitting hole 5 is made to have a slightly smaller diameter than the outer peripheral diameter of the fitting part 3 of the paper surface piece 1, and the fitting hole 5 is attached by caulking using the elastic force of the fitting part 3. ing.

Further, a device is known in which the fitting portion 3 and the planar outer peripheral portion of the contact piece main body 2 are attached to the main body base 4 by adhering them with an adhesive.

[Problem that the invention attempts to solve]

In all of the above-mentioned conventional products, the paper surface piece 1 is fixed to the main body base 4, so if the paper surface sliding surface side becomes worn or scratched, the paper surface piece 1 can be easily replaced with a new one. cannot be replaced.

Further, in the case where a part of the fitting portion 3 is melted and attached, it takes a long time to attach and the work is extremely difficult.

Furthermore, in the case where the fitting portion 3 is fitted into the fitting hole 5 for attachment, there is a risk that the fitting portion 3 may be destroyed during attachment, and reliable attachment cannot be achieved.

Therefore, the present invention has developed a paper interview head for drafting machines that can be easily replaced when worn or scratched, is easy to install, and can be reliably attached to the main body base. It was proposed for the purpose of providing a piece of paper.

[Means for solving problems]

The present invention consists of a disk-shaped paper piece having a cylindrical body set up in the center of the back surface, and a screw shaft that is screwed into the cylindrical body, and the cylindrical body has a plurality of split ends that are continuous in the axial direction from the end surface. A main notch is formed, a locking protrusion is protruded in an annular shape on the outer periphery of the paper surface piece, and the cylindrical body of the paper surface piece is attached to a small hole opened in the main body base of the head body of a drafting machine head, etc. The diameter of the cylindrical body is expanded by inserting the screw shaft into the cylindrical body from the inside of the body base from the outside of the main body base, and an annular locking groove drilled on the back surface of the main body base. The locking protrusion on the outer periphery of the paper surface piece is engaged with the paper surface piece, and the paper surface piece is tightened and fixed to the main body base.

[Effect]

In the present invention, a cylindrical body planted on a paper surface piece is inserted into a small hole in the main body base, and a screw shaft is screwed into the cylindrical body, so that the diameter of the cylindrical body is expanded and tightened and fixed in the small hole. be done.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

The paper surface piece 11 according to the present invention is shown in FIGS. 1 and 2.
As shown in the figure, it is attached, for example, to the bottom side of a main body base 14 that constitutes a head main body 12a of a head 12 for a drawing machine.

The paper surface piece 11 is formed by molding synthetic resin as shown in FIG. It is constructed by installing a cylindrical body 16. This cylindrical body 16 is formed with a plurality of cuts, for example, three splits 17, which are continuous in the axial direction from the end surface, so that the diameter can be easily expanded.

Further, on the outer periphery of the back side of the contact piece main body 15, a locking protrusion 18 is protruded in an annular shape to perform a positioning function when attached to the main body base 14.

On the other hand, as shown in FIGS. 1 and 4, the main body base 14 has a small hole 19 through which the cylindrical body 16 of the paper surface piece 11 is inserted. An annular engagement groove 22 is formed in which the locking protrusion 18 engages. In addition, the above small hole 1
9 is opened with a slightly larger diameter than the outer diameter of the cylindrical body 16.

Then, the paper surface piece 11 is inserted into the cylindrical body 16 from the outside of the bottom side of the main body base 14. Here, from the inside of the main body base 14, the cylindrical body 16 is
A screw shaft 21 such as a self-tapping screw is screwed into the cylindrical body 16, and the cylindrical body 16 is expanded in diameter and tightened and fixed in the small hole 19. At this time, the engagement protrusion 18 of the paper surface piece 11 is engaged with the engagement groove 22, and the paper surface piece 11 is engaged with the engagement groove 22.
1, the mounting position is regulated.

By the way, the screw shaft 2 that expands the diameter of the cylindrical body 16
Since the diameter of the cylindrical body 16 can be made larger than the diameter of the small hole 19, the cylindrical body 16 is selected to have a shaft diameter larger than the inner diameter of the cylindrical body 16. Further, as the screw shaft 21, various screw shafts other than self-tapping screws can be used.

In the above-mentioned embodiments, an example of application to a head for a drawing machine has been described, but the present invention is not limited to this, and can be applied to a device that slides on a paper surface, such as a head for a drawing machine in a drawing machine, etc. It is something that can be done.

[Effect of idea]

As mentioned above, in the present invention, the diameter of the cylindrical body is expanded by inserting the cylindrical body set up on a paper piece into the small hole of the main body base and screwing the screw shaft into the cylindrical body. Since it is configured to be tightened and fixed in the hole, it can be easily removed and replaced by removing the screw shaft. Therefore, if the paper contact surface becomes worn or scratched, it can be easily replaced, thereby improving the durability of the drawing machine head and the like.

In addition, since the installation can be done by simply screwing the screw shaft, the installation work is extremely easy.
Even if the threaded screw becomes loose, the diameter of the cylindrical body can be expanded by threading the screw shaft, and the cylindrical body can be firmly connected to the small hole again. There is no need to replace paper strips.

Furthermore, since the locking protrusion on the outer periphery of the paper cutout is locked into the annular locking groove on the back of the main body base, the mounting position can be defined, and the thickness of the main body base that the cylindrical body of the paper cutout contacts can be used as is. Therefore, the contact area between the two can be increased, and the screw shaft can be securely tightened and fixed by screwing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing how the paper surface piece according to the present invention is attached, FIG. 2 is a side view showing a drawing machine head to which the paper surface piece is attached, and FIG. FIG. 4 is an assembled side view showing the state in which the paper surface piece is attached. FIG. 5 is a cross-sectional view showing how a conventional paper surface piece is attached. 11...paper surface piece, 14...main body base, 15
... contact piece body, 16 ... cylindrical body, 17 ... split,
19...Small hole, 21...Screw shaft.

Claims (1)

[Claims for Utility Model Registration] Consisting of a disc-shaped paper surface piece with a cylindrical body planted in the center of the back, and a screw shaft that is screwed into the cylindrical body, the cylindrical body has a cylindrical body that extends from the end surface in the axial direction. A plurality of consecutive splits are formed, a locking protrusion is provided in an annular shape on the outer periphery of the paper surface piece, and the cylindrical body of the paper surface piece is attached to the main body base of the head body of a drafting machine head, etc. The diameter of the cylindrical body is expanded by inserting it into the small hole from the outside of the main body base, and the screw shaft is screwed into the cylindrical body from the inside of the main body base, and the annular shape drilled on the back surface of the main body base is inserted into the small hole. A paper surface piece for a drafting machine head, etc., characterized in that the paper surface piece is tightened and fixed to the main body base by locking a locking protrusion on the outer periphery of the paper surface piece in a locking groove. .