JPS5859086A - Type wheel and production thereof - Google Patents

Abstract

PURPOSE:To produce a type wheel capable of being drawn out from a casting die more securely and produced in a higher yield, a predetermined range (from a back surface) of surfaces perpendicular to a type face other than slanted surfaces of a projection provided at a support part of a type is made to be surfaces whereon an appropriate friction is generated. CONSTITUTION:Side surfaces 26 of flat parts 21, 22, 25 of the back surface corresponding to a part between two types 41, 42 are perpendicular to the type face and are satinized. Die surfaces of the casting die on the back surface side corresponding to the side surfaces 26 are also satinized. When the die is opened after casting, each type body of a type wheel remains adhered to the die 52 on the back surface side, because the friction between the cast product and the die at the satinized surfaces is large.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a type wheel used in printing devices such as typewriters and word processors, and a method for manufacturing the type wheel.

For printing elements used in printing devices such as typewriters and word processors, select the center 1a and turn the motor as shown in Figure 1, for example. rk +1 (take it to II
1. A large number of spokes 2 extend radially from a disk-shaped hub 1, and the fingers, each having a typeface formed at the tip thereof, are shaped like a chrysanthemum flower, and are used as a disk-shaped printing wheel or a disk-shaped printing wheel. As shown in Figure 2, around a circular base plate 1' whose center 1+1' can be attached to the rotation axis, a type body 3 is attached to the tips of spokes 2, and a large number of fingers are attached to a cylindrical surface or a truncated circle. <;
A so-called flower type type wheel, such as a bowl type type wheel formed in the shape of a flower petal, is used.

Also, the request for printing 1-1-1-1), uppercase and lowercase letters of the alphabet, Arabic numerals and more!
In order to include many types of characters such as letters and symbols of each building in the t typographical wheel in 11), one finger contains I: '-J, -
A type wheel with two levels of type is also used for music.

During the printing operation, the inner character wheel is attached to the rotating shaft of the selection motor, and the selection motor rotates the character wheel by a predetermined angle in response to the print signal, bringing the character corresponding to the signal to the printing device, and printing the back side of the type body. The tip of the hammer is used to strike J1, and the printed character surface provided on the 1111 side of the type body is printed on the sheet of paper wrapped around the platen via the ink ribbon.

By the way, the typeface of the conventional t typographical wheel is, for example, the 6th
As shown in the figure, the back side 3a of the typeface was made flat, and printing was performed by striking this surface with a so-called flat hammer 4 having a flat striking surface 4a. However, since the spokes 2 that hold the typeface 6 are generally made of a low-elastic material such as synthetic resin, their dimensions and positional accuracy are poor (and they tend to deteriorate over time).

Furthermore, in order to increase the printing speed, if the wheel is rotated at high speed and printing is performed immediately after stopping, the vibration of the spoke 2 has not yet started ((it will be hit with the hammer 4, and the printing r
The problem was that the positioning shifted left and right, the spacing between characters became uneven, and the print quality deteriorated.

Therefore, as shown in FIG. 4, a protrusion 6 having an isosceles triangular cross section is provided on the back surface of the typeface 5, and the back surface is formed into a groove having an isosceles triangular cross section corresponding to χ·1 in the above description 6. 71
] is used to make the protrusions 6 follow the grooves 71], thereby printing while correcting the position of the type 5. 7. If you hit a typographical wheel with such a backward-shaped font 5 with a flat hammer, the edge of the protrusion will be crushed, so 11/
For printing devices with (+iii)
There were also drawbacks such as not being able to move (3, r) when I hit f1. .

・In order to resolve these shortcomings, we further added Q[1<, ☆ on the back of the font 8] Ai II 1-1! shown in Figure 5. , part 9 a) base) 1 cedar I, 1 other protrusion 9 ++ 1 formation 1 ~, this also has a groove i of R-shaped cross section
A 1Jt model has been proposed in which printing is performed by hitting ob on the tip 1tla with a hammer 1 [].4). But l~
, I1-J”6 typeface with this kind of back shape [
1J1 (If pasted with a hammer, 11 shown in Figure 6)
↑ which extends from the upper middle part to the left and right like the character ``? For type 8, which has lj minutes, is the width of the hammer's strike smaller and the effect of its striking force? The line of action of the reaction force that moves by urine and the tip 11 of the type is shifted, and the type 8 is printed tilted around +1q11 of the spoke 2, so that the portion of the printed character corresponding to the tip 11 of the type is It has some flaws.

In order to avoid this, recently, as shown in FIG. 7, the back of the typeface 20 is divided in the axial direction of the typeface, and part of it (in the case of the figure, the upper and lower parts) has wide flat parts 21, 22. , and the other part (center part in the figure) is provided with a positioning part 26 having a trapezoidal cross section or an isosceles triangular cross section with an upper base surface or ridge angle that does not protrude from the flat part and having sloped surfaces 24 on both sides. The flat portion 21, 22 is provided at the tip of the hammer 30.
A flat part 31, 32 is formed in the part corresponding to the above-mentioned part, and a V-shaped groove is formed in the part corresponding to the part 23 having slopes on both sides.
A typeface positioning device has been proposed which is provided with 3. By making the back surface of the type body 20 into the above-described shape, it is not only possible to position it with a hammer 30 as shown in FIG. The leading edge is the flat part 2 on the back of the typeface.
1.22 with a wide width, the above-mentioned rotation of the typeface does not occur, and therefore it is effective in preventing fatigue failure due to letters being rubbed off and twisting of the spokes 2.
1, (1).

The arrangement of the positioning part having the bottom part and one margin on both sides is either 1', 1 in the example shown in FIG. 7 or on the back side of the typeface 20 as shown in FIG. A positioning part 1) and a lower ↑ (A) positioning part 23 are provided on both sides.
A flat part 21 is provided in the center (I'4 formation, Fig. 8 (1)
3), the back surface of the typeface 20 is divided into two parts, with a positioning part 23 at the top and a flat part 21 at the first part, or as shown in FIG. 8(C), The opposite configuration etc. can be considered 1. In addition, the positioning part 23 in FIG. E3 (C) has an isosceles triangular section for convenience 1,
Place the ■-shaped groove at the tip of the hammer, and place h' on the sizing collar 33, depending on the configuration of the back of the printed body (11).
, needless to say.

(A), (B), and (c) in Figure 9 are approximately 11)
On spoke 2 of 2 letters 41 + 42, there is a protective t
Inner font 4+1 decoy side view, rear view, and cross-sectional view. First, as shown in FIG. 7, the flat part 21.
22, in the middle thereof, there is disposed a sliding positioning part 23 having inclined surfaces 24 on both sides. The support portion 46 is integrally molded to wrap around the upper portion of the spoke 2. spoke 2
The -F end of the -F reaches the lower end of the type 41 of the - part, and the protrusion 2 protrudes rearward at a right angle near the second end of the spoke 2.
A flat portion 25 is provided between the flat portions 22 and 21 surrounding the flat portion a and having a step therebetween.

Below-1 = The various typefaces described above are molded by injection molding using molds made by electrical discharge machining. An example of the manufacturing method will be explained using the typeface shown in FIG. 9 as an example. The mold for the typeface is made up of a pair of molds 51 and 52 for the front side and the back side of the typeface, as shown in FIG. , the surface passing through the spout 2 is combined to form an integral mold. The tips of the spokes 2, which have been molded integrally with the hub from rubber having appropriate elasticity and flexibility, are placed in the space in which the type is to be cast, and the molds 51 and 52 on both sides are brought together and closed. An annular runner 53 is provided on the peripheral surface of the mold over the entire circumference, and communicates with the casting space of each type body via a runner 54. The typeface is made of a synthetic resin that has the characteristics required for type, such as impact resistance and abrasion resistance, and is injected into J Kajo-yu, 653, from a dryer (not shown). Therefore, all the typefaces 40 of one typographical wheel are created at the same time, the old edition of the typeface is wrapped around the previously inserted spokes 2 (then one piece is molded into this), A type wheel is created.

When the mold is opened after casting, each typeface is ()) (1-
11-sided type, and some others are JIIQ on the back side.
This creates a soldered type wheel, so that all parts of the cast product remain attached to one mold or the other (2.
Then, use the ejector pin to push it out. .

The sides of the typeface are all slanted, so ','i'
：Easy to remove from the mold (Conventionally, when the mold is opened, the wrong side of the seal will be released from the mold, and the back side will remain attached to the mold.

However, if a trapezoid or isosceles triangle 101 protrusion is provided on all or part of the back surface of the old VCL typeface to position the typeface, the protrusion becomes slanted and easily separates from the mold, making it difficult to mold the product. Since the area of the surface perpendicular to the mating surface of the mold that holds the mold does not decrease (b), the back surface as a whole becomes easier to release from the mold. On the other hand, the difficulty of releasing type varies depending on the character, and if the type is easier to release than before by providing a slope as a positioning means on the back of the type as described above, each type will be separated into one type or another. The difficulty of keeping up has started to arise.

This invention provides the above-mentioned method for mold release during casting of a type wheel in the case where a beveled projection having a trapezoidal or isosceles triangular cross section is provided on the back surface of the type body as a means for positioning the type body of the type wheel. The purpose of this invention is to provide a type wheel and its manufacturing method that solves the problem.

Hereinafter, the present invention will be explained in detail with reference to drawings showing embodiments thereof. FIG. 11 is a view showing an embodiment in which the present invention is applied to the typeface shown in FIG. A positioning part 23 having 24 is provided.

Further, on the back surface between the two printed characters, there is provided a flat part 25 that surrounds the protrusion 2a at the tip of the spoke 2 with a slight difference in level from the flat part 21, 22 mentioned above. Side 2 of each flat part above
6 is χ;1 and IIi, straight on the typeface. These aspects 2fA, tlk K na-).

In order to make the vertical surface of the side surface of the 11-set portion on the back side of the type body satin-finished, the mold surface of the back-side mold corresponding to this part is also made satin-finished.

Therefore, when the mold is opened after casting with this typeface, there is a large friction between the surface of the product and the surface of the mold corresponding to this surface, and a considerable portion of the back surface of the typeface is Although the type body is 0't, each type body of the type wheel is sure to reach the mold 52 on the back side, and the remaining 2y (despite the provision of the slope of the lid determining river).

In addition to the above-mentioned pear-shaped surface, as a means to increase the friction between the perpendicular sides of the typeface and the corresponding surface of the mold, it is possible to increase the surface area by providing countless fine grooves in the direction of removing the mold. It's okay to increase KL.

In addition, as shown in FIG. 12 (if a protrusion 9 having an inclined surface is provided on the entire back surface of the typeface 8, the part of the side surface 8a that is perpendicular to the inclined surface and in contact with the mold on the back side is made of satin finish, etc.). You can get the same effect by doing so.

As described above, according to the present invention, when a slope for positioning is provided on the back side of a typeface, removal from a mold is ensured,
It is effective in improving the product yield of type wheels.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a conventional disk-shaped type wheel, Fig. 2 is a side view showing an example of a conventional bowl-shaped type wheel, and Figs. 6 to 5 are rear views of conventional type fonts. Figure 6 is a front view of an "L" type typeface, and Figure 7 is a perspective view showing an example of the shape of the back of a recently proposed typeface and the hammer tip. , Figure 8 (A
), (B), ←) are rear views showing the modified embodiments;
Figures (A), (B), and (C) are a still view, a rear view, and a cross-sectional view of a typeface having two characters on one finger, respectively, and Fig. 10 is a cross-sectional view explaining the casting method of the typeface. , FIG. 11 is a perspective view showing an embodiment of the present invention, and FIG. 12 is a perspective view showing an embodiment of the present invention.
The figure is a perspective view showing another embodiment of the present invention. 1...Hub 2...Spoke 6...
Typeface 26... typeface back protrusion 26...
- Vertical side surface 41.42... - Print type 43... Print support portion 51.52... Fishing type Fig. 8 Fig. 9. ] (A) (8) (C) 1 C:711 ・4

Claims (4)

[Claims] (1) If a projection with a trapezoidal or isosceles triangular cross section is provided on the back side of the support part of a typeface consisting of a typeface and its support part, when stamping, insert the projection into a groove corresponding to the shape of the projection at the tip of the hammer. In a type wheel which is engaged to position the type, a certain range from the back surface of a plane perpendicular to the type surface other than the inclined surface of the protrusion of the support part is a surface that generates moderate friction. A type wheel characterized by: (2) Protrusions with a trapezoidal or isosceles triangular cross section are provided on the back side of the support part of the type body consisting of the typeface and its support part, and when stamping, the protrusion is placed in a groove formed at the tip of the hammer with a shape corresponding to the protrusion. The type wheel, which positions the type by engaging it, is made by injection molding using a mold formed by combining two molds on the type face side and back side, and the spokes are formed integrally with the roughened hub. In the method of manufacturing a type body by surrounding it, forming a mold surface corresponding to a surface perpendicular to the mold stand surface of the type body support portion of the back side mold to a surface that generates moderate friction; This method of manufacturing a type wheel is characterized in that when the mold is opened after casting, the product remains attached to the back side mold, and then the product is removed from the back side mold by an appropriate means. (3) The type wheel according to claim 1, wherein the surface that produces the above-mentioned appropriate friction is a satin surface. (4) The type wheel manufacturing method according to claim 2, wherein the surface that produces the above-mentioned appropriate friction is a satin surface.