JPS59111855A - Printer - Google Patents

Abstract

PURPOSE:To obtain a printer capable of preventing the breakage of an ink ribbon and paper by a method in which the height of types is varied according to the sizes of type areas, the printing stress is kept constant, and high-quality letter printing is made. CONSTITUTION:A coil 10 excited by a signal from a timing mark provided beneath types 1 on a type belt 2, and a hammer 4 in a tensed state due to the spring force is released to impact the types 1. For types of larger type areas, the height H of the types 1 is increased so as to shorten the stroke 11 of the hammer 4, whereas for the types 1 of smaller type areas, the height H of the types 1 is decreased so as to lengthen the stroke 11 of the hammer 4. By setting the height H of each type 1 in this way, all of the type 1 can be impacted by the hammer 4 with almost constant printing stress.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention 1= relates to a type impact type printing device (7) In order to particularly improve the printed quality, the printing stress of each type at the time of impact?= 'Relating to a printing device that prints while keeping it constant.

(b) Prior art and t'-il j11! 2. Description of the Related Art As a type impact type printing apparatus that prints type by impacting a type on a Braille type belt, a type drum, etc., there is a line printer apparatus as shown in FIG. 1, for example.

In the figure, type characters 1 are embedded at equal pitches on the upper side of an endless belt, and a type belt 2 is constructed.
It is rotating at a constant speed.

In addition, 1. opposite to the type 1 on the type belt 2. A hammer 4 is provided, and an ink ribbon 5 is provided between the hammer 4 and the type 1.
Printing is performed by striking the type 1 with the hammer 4 with a recording medium (hereinafter referred to as paper) 6 interposed. A platen 7 is provided on the opposite side of the hammer 4 to receive the printing pressure of the hammer 4, and the ink ribbon 5 is rotated by a ribbon feed roller 8 via an ink ribbon storage section 9.

Since the hammer 4 strikes the type 1 with a constant force, the print density depends on the type area, which varies depending on the type 1, and characters with a high density and characters with a light density are printed. For example, letters M'' and 8'', which have a large print area, are printed very thinly because the printing stress is small, whereas letters ".", "7", etc., which have a small print area, have a large print stress and are printed extremely darkly. Therefore, characters with a large print area have the disadvantage of being difficult to read, and characters with a small print area have the disadvantage of causing damage to the paper 6 and the ink ribbon 5 due to the large printing stress.

<c+ Purpose of the Invention The purpose of the present invention is to provide a printing device that prints characters with good quality and prevents damage to the ink ribbon and paper by keeping the printing stress constant.

(d) Structure and object of the invention According to the present invention, an ink ribbon and a recording medium are interposed between a type on a type belt, a type drum, etc., and a nine-frame spacer provided opposite to the type. , a printing device that prints on the recording medium by striking the type with the noma, wherein the height of the type is changed depending on the size of the print area of the type. This is achieved by providing

(e) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a perspective view showing a printing hammer mechanism of the type impact type printing device of FIG. 1. When this printing hammer mechanism prints, the coil 10 is excited by a signal received from a timing mark (not shown) provided directly below the type 1 on the type belt 2, and is kept under tension due to the spring force. Niada No Nma 4 is released and impacts Type 1.

In this impact, in order to keep the printing stress applied to the type ♀ 1 on the type belt 2 constant, the printing force and the type area are related.
If the excitation force of 0, the spring constant of the meter 4, and the stroke 11 of the meter 4 are constant, a constant printing force can be obtained. On the other hand, if the stroke 11 of the hammer 4 is slightly changed, the printing force can be easily changed because the hammer 4 has a cantilevered structure.

For example, if the height of the printing type 1 is made high as shown by the solid line in FIG. As shown in FIG. 4(b), the hammer 4 is in contact with the type 1 and the input I7, and a large printing force can be obtained. 4th in general
If the height of the type 1 is lowered as shown by the dotted line in Figure (a), after the spring portion 12 of the hammer 4 consumes a certain amount of # kinetic energy, the hammer 4 will be lowered as shown in Figure 4 (b). It makes an impact with the type I and provides small printing power.

Therefore, for type with a large type area and requiring a large printing force, the height H of type 1 is increased so that the stroke 11 of the hammer 4 is shortened. For type 1, which requires force,
The height (I) of type 1 is lowered so that the stroke 11 of hammer 4 becomes larger. In this way each type 1
By determining the height H for , all printed characters 1 will impact with the hammer 4 with a constant printing stress.

Standard printing density is achieved when type 1 with a standard type area is struck with a constant force by the hammer 4. Therefore, the optimum printing stress can be easily determined due to the cantilevered structure of the hammer 4, and since the print area can also be easily calculated, the printing force for each print character can also be easily calculated.

That is, if impact is applied to each character with the optimum printing force, characters with uniform print density and excellent print quality will be printed.

Specifically, for example, as shown in the table below, the size of the typeface area is ranked and the height of each typeface is determined. By keeping the printing stress of the printing press constant, it is possible to print uniformly without causing printing shading depending on the type area or damage to the paper 6 or ink ribbon 5 as in the past. Characters with excellent print quality and print density are printed.

(f) Effects of the invention As explained in detail above, the printing device of the Ming Dynasty [
By changing the height of the type according to the type area, the printing stress at the time of impact can be kept constant. This has the effect of preventing damage to the paper and improving print quality.

[Brief explanation of the drawing]

FIG. 1 is a plan view for explaining the trajectory of a conventional printer/7 printer, FIG. 2 is a perspective view of a printing hammer mechanism for explaining the 11J character device of the present invention, and FIG. ? Section m1 of Figure A2 and Figure 4 are N1 showing the state of the Yuhamma, (
A) is a cross-sectional view showing the hammer in a suction state, and (b) is a cross-sectional view showing the hammer in an impact state. In the figure, l is a type, 2 is a type belt, 4 is a hammer,
5 is an ink ribbon, 1 (1: coil, 11 is a stroke, 12 is a spring part).

Claims (1)

[Claims] An ink ribbon roller and a recording medium are interposed between the printed characters formed on the type carrier and a hammer provided opposite to the printed characters, and the printed characters are struck by the hammer, thereby producing the printed characters. In a printing device that prints on a recording medium, the height of each of the plurality of type characters formed on the type support body is adjusted so that the stress received from the nIJ hammer is constant depending on the size of the type area. Inside a printing device characterized by changes.