JPH0533344Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is an inner hammer type small impact that prints by protruding the type using a printing hammer mechanism provided inside the type drum unit and pressing the type against the printing paper. Concerning printer type sheets.

[Conventional technology]

Conventionally, this type of inner hammer type compact impact printer has an elastic member integrally molded, which is composed of a type part 1a, a corresponding projection part 1d, and a sheet part 1e for connecting each type part, as shown in FIG. Type sheet 1 was used.

[Problems that the invention aims to solve] Therefore, with type sheets of conventional structure, it is possible to shorten the line pitch of type in order to further downsize the printer, or increase the number of type characters without making the printer larger. If the row pitch of the type is shortened to improve the stacking of the type, the shape of the type sheet 1 will be as shown in Figure 4, but the shortened type pitch will make it difficult to print. The area of the sheet portion 1e that stretches during this process is reduced, and the amount of elongation is also reduced. Therefore, since the tension in the sheet between each type increases, for example, in FIG.
9, 10), even numbers “0” and “1” (printed characters 11, 1
2, 13, and 14) also protrude at the same time against the tension in the row direction during winding, and come into contact with the printing paper 5 as shown in FIG. 5, resulting in printing stains.

The present invention is intended to solve these conventional problems, and is aimed at preventing print smudges when the degree of accumulation of type on a type sheet is improved.

[Means for solving problems]

That is, in order to solve the conventional problems, the small impact printer according to the present invention has a type sheet made of an elastic member, which has multiple rows of type bases with type on the surface, and a type sheet with type sheets on the circumferential surface. It has a cylindrical type sheet holder that is wrapped and whose rotation is controlled, and a printing hammer mechanism that is installed inside the type sheet holder and prints by protruding the type base. It is characterized in that slits of approximately the same length as the type base are arranged on both sides in the direction.

[Effect]

As mentioned above, by providing slits of approximately the same length as the type base between the type characters in the digit direction of the type sheet, the slits between the type characters in the digit direction, which increases as the type density of the type sheet increases, can be reduced. Since the strong tension of the sheet portion can be reduced, when printing a certain type character, it is no longer possible for adjacent type characters that have jumped out due to the tension to come into contact with the printing paper and cause print smudges.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3.

FIGS. 1a and 1b show examples of the type sheet of the present invention, where the type sheet 1 is integrally molded with an elastic member,
Type part 1 consisting of type 1b and type base 1c on the surface
a and a corresponding protrusion 1d on the back surface,
A plurality of slits 6 having the same length as the type base 1c are provided between the type portions in the digit direction, and the row pitch of the type portion 1a is further shortened to improve the degree of accumulation of type. As shown in FIG. 2, this type sheet 1 is fitted into the hole 2a of the type sheet holder 2 and the protrusion 1d, and then wound while applying tension in the row direction of the sheet portion 1e to form a type drum unit. 3, and a printing hammer 4 disposed inside the type drum unit pushes out the protrusion 1d to perform printing. Figure 3 is a diagram showing the printing condition of the printing pattern where printing smudges are most likely to occur. In the case of printing, since the slit 6 is provided in the sheet portion 1e between the type portions in the digit direction, the tension of the sheet portion 1e acting on the type portions (type 8-1 in Figure 1)
1, 8-13, 9-11, 9-13, 9-12,
9-14, 10-12, 10-14) is reduced, and the printed characters (printed characters 11, 12, 13, 14 in Figure 1) in the adjacent line protrude due to the tension, and the printed paper Since there is no contact with 5, printing stains can be prevented.

[Effects of the invention] As explained above, in the present invention, the degree of accumulation of type can be improved by providing slits of approximately the same length as the type base in the sheet portion between the type portions in the same row direction of the type sheet. When printing two or more adjacent characters in the same line at the same time on a printed type sheet, the slit reduces the relationship between the type parts, that is, the tension in the sheet, so that the characters in the adjacent rows of printed characters are printed on the sheet. Since there is no possibility that the part protrudes due to the tension and comes into contact with the printing paper, it is possible to prevent the printing from becoming smudged.

Further, according to the present invention, it is possible to miniaturize the printer by increasing the degree of integration of type, and to reduce printing energy by reducing the tension between the type parts in the digit direction.

Furthermore, because the length of the slit is short and is almost the same as the type base, when the type sheet is removed from the mold during the production of the type sheet, the type that is difficult to release is only the type above and below the type. Since the tension is obtained from the joints with adjacent type without any connection parts, the mold can be released with less stress on the upper and lower joints than when there are no joints on the left and right sides. Defects such as stretching and deformation are significantly improved, and yield quality is improved.

Furthermore, type sheets can be kept in a sheet state without getting tangled with the type base etc. by the connecting part with the adjacent type base, so type sheets can be stored stacked, and type sheets can be wrapped around a type sheet holder. However, even when using this method, it is extremely easy to handle and improves work efficiency.

As explained above, the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

FIGS. 1a and 1b are a plan view and a sectional view of a type sheet according to an embodiment of the present invention. FIG. 2 is a sectional view of the mounting structure according to the embodiment of the present invention. FIG. 3 is a sectional view showing the state of the type sheet during printing according to the embodiment of the present invention. Fourth
Figures a and b are a plan view and a sectional view of a conventional type sheet. FIG. 5 is a diagram showing the state of a conventional type sheet during printing. 1...Print sheet, 1a...Print section, 1b...
Type, 1c...Type base, 1d...Protrusion, 1e
... Sheet part, 2 ... Type sheet receiver, 2a ...
hole, 3... type drum unit, 4... printing hammer, 5... printing paper, 6... slit, 7... ink roll.

Claims (1)

[Claims for Utility Model Registration] A type sheet made of an elastic member and having multiple rows of type bases each having type on its surface, and a cylindrical type whose rotation is controlled by wrapping the type sheet around its circumferential surface. a sheet holder; and a printing hammer mechanism provided inside the type sheet holder for protruding the type base to print, and the type sheet has the type base on both sides of the type base in the digit direction. A small impact printer characterized by a slit that is approximately the same length as the stand.