JPS5946799B2 - Drafting head of a drafting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a solid cylinder 4. with a secondary radius disc and a screwed ruler holder. A drafting machine having a first component group consisting of an upper cover plate carrying a band grip, and a second component group comprising a scale ring with graduations and an externally interlocking Lascou disk. Regarding drafting heads.

When assembling known drafting heads of this type, it is particularly important that the individual components of the respective component group are adjusted and fixedly connected to one another.

This is because the drafting accuracy of the drafting machine is determined by the adjustment and fixing described above.

Furthermore, these various components as well as their connection means are subjected to large torsional forces and moments during use, and these torsional forces and moments can cause the connections to loosen, especially after long drafting operations. There is a risk.

In particular, the raster disk must be precisely aligned and fixed to the scale disk with graduations, and the ruler support must also be precisely aligned and fixed to the zero reading or sub-R disk.

Such adjustment and fixing is accomplished by fixing the parts together using bolted connections, as well as supplementary fixing or safety pins that provide a form-locking connection.

If a shape-fixed connection means is already provided when manufacturing the component, the precision required for the component is high.

This is because position correction is no longer possible during assembly.

In addition, it is also possible, during assembly of the drafting head, to create a form-locking connection after adjusting the parts to each other in the form of holes for receiving pins or bolts.

However, this approach is very expensive and has the further disadvantage that boring chips left in the assembled drawing head can damage the bearings.

The object of the invention is to provide an improved drafting head of the initially mentioned type, which is easy to assemble and allows for a high degree of mutual adjustment of the components and functional elements.

The above object is achieved according to the invention by means of stamped protrusions which fit into predetermined holes made by the pin connection means and the bolt connection means after adjustment, in which the members of each component group are fixed in shape. This was achieved by interconnecting them and fixing their positions.

At least a portion of the components and functional elements of each component group are made of a material that can be cold-deformed, such as aluminum, and the other portions are made of a hard material, such as steel. The punched protrusions that create a fixed shape can be easily and quickly formed using a punch after adjusting their centers and fixing the individual components with screws.

In order to avoid deformation of the precise solid axis and condition, it is effective to ensure that the punched projection fits into the center of the elongated hole provided radially with respect to the central axis of the drafting head.

This same effect can be achieved using a stamped punch with flat sides, which can be used to form an elongated stamped protrusion that fits into a round hole. .

According to an advantageous further embodiment of the invention, more than two parts can be fixed in a fixed position with respect to one another by a special configuration of the stamped projections, in which case
It is advantageous if an intermediate disc is used, and securing the position by means of pins can be omitted.

In this embodiment, a relatively large diameter protrusion is first extruded;
A punch with a diameter smaller than that described above is used to transform the protrusion into a shape-fixed protrusion.

The invention will now be described in detail with reference to the accompanying drawings, which illustrate embodiments of the invention.

The component group shown in FIGS. 1 and 1a comprises a graduation disk 1 with graduations 2 and a raster disk 3 with meshing teeth 4 generated regularly distributed over its circumference. ing.

Both discs 1 and 3 are fixed against movement using four bolts 5 and a sleeve-shaped locking nut 6 against the thin cover disc 1.

In order to fix the three discs 1, 3 and 7 in position against movement, the scale disc 1 is provided with two stamped projections 8, which are provided on the steel raster disc 3. It is adapted to fit into a corresponding hole 9.

As is clear from FIG. 2, the protrusion 8 extruded into the scale disk 1 is formed by a push punch whose side surfaces are both flattened, while the sub-R disk 11 and the cylinder 12 of the ruler holder 13 The protrusion 10 between the two is extruded using a punch having a circular cross section.

The ruler holder 13 is rotatably attached to the cylinder 12 using bolts 14 and pins 15 and 16.

In the case of the positioning device shown in FIGS. 3a and 3b, the raster disk 3 is provided with an elongated hole 17,
The longitudinal axis of the elongated hole 17 is oriented in the radial direction of the disk.

With this configuration, deformation of the hole during punching can be avoided.

Figures 4a and 4b show another embodiment that avoids hole deformation.

To extrude the protrusion 1B, a punch with an elongated extrusion member is used, as in the configuration shown in FIGS. 1 and 2.

Since the punch is adjusted laterally to the radial direction,
A circumferentially extending elongated projection 1B having a radially arcuate shape is obtained (see FIG. 4b).

A position holding device provided between the cylinder 12 and the secondary R11 is shown in FIGS. 5 and 6.

In the embodiment shown in FIG. 5, a cylindrical bore 19 in the cover disc 20 is provided with a bore 21 of increased diameter above it.

After the punch is aligned by inserting the center pin 22, it passes through the hole 21 and inserts into the sub-R11.
The projection 10 is then extruded.

In the embodiment shown in FIG. 6, the protrusion 23 projecting through the hole 24 in the relatively large diameter intermediate disk 25 is produced in two stamping steps.

Two stamping punches with different diameters D1 and D2 are used one after the other, in which case the smaller diameter D2
A stamping punch having a shape is passed through the previously extruded punch hole and the two stamping steps described above create the final shape and fixation between the three parts 12.20.25. be able to.

[Brief explanation of drawings]

1 and 1a show a plan view and a sectional view of a component group with graduated discs and raster discs; FIGS. FIG. 2 is a partial cross-sectional view showing the assembled drafting head in an enlarged circle. Figures 3a and 3b are a partial cross-sectional view and a plan view showing the position retention between the raster disk and the graduated disk. 4a to 4c are partial plan and sectional views showing the state of position retention between the scale disc and the raster disc; FIGS. FIG. 5 is a partial cross-sectional view showing how the position is maintained between the cylinder of the ruler holder and the sub-R disk. FIG. 6 is a partial sectional view showing how the position is maintained between the cylinder of the ruler holder and the sub-R disk when an intermediate disk is used. 1...Graduation disk, 2...Graduation, 3
... Raster disk, 4 ... Meshing teeth, 5 ... Bolt, 6 ... Locking nut, 7 ... Cover disk, 8...
・Protrusion, 9...hole, 10...protrusion, 1
1... Sub-R112... Cylinder, 1
3...Ruler holder, 14...Bolt, 15.16...Pin, 17...Elongated hole, 18...Protrusion, 19 ...hole, 20.
...Cover disc, 21 ... Hole, 2
3... Protrusion, 24... Hole, 25...
...Intermediate disk.

Claims (1)

[Claims] 1. A first component group consisting of a secondary R-disk, a cylinder with a screwed ruler holder, an upper cover plate carrying a band grip, a scale ring with a scale, and a scale ring with a scale. , and a second component group containing externally intermeshing raster disks, the individual members 1 of each component group
, 3; IL 12 as well as the component group to each other, by the pin connection means and the bolt connection means 5.6; A drafting head for a drafting machine, characterized in that the processing protrusions 8; 10; 18; 23 are joined to each other in a fixed shape to fix the position. 2. The drafting head according to claim 1, wherein the punched projection 8 fits into the elongated hole 17. 3. The drafting head according to claim 1, wherein the punched projection 18 has a shape that fits into the circular hole 9 and extends in the length direction. Claims 1 to 3, characterized in that more than 42 members 12, 20, 25 are fixed in position by stamped protrusions 23 made through a plurality of deformation processes. The drafting head described in one of the above.