JPS5820466A - Dot printer - Google Patents

Abstract

PURPOSE:To enable a high speed printing doubling the speed in the past while reducing the cost of the printing system to one-half in terms of the same speed specification by allowing the reverse direction movement of a paper feeding mechanism with respect to a dot head. CONSTITUTION:As rocking motor 16 rotates, a paper feeding mechanism 2, namely, a paper head 3 moves in the opposite direction with respect to dot head carrying section 1 through rock cams 13 and 15, which doubles the relative movement speed of the dot head 9 with respect to the printing paper 3. The relative amplitude of the dot head 9 also doubles with respect to the paper 3 thereby permitting the doubling of the list pitch in the rocking direction B of a pin on the dot head 9. This makes the number of required pins and the cost of the printing system to one half in term of the same printing speed. In addition, when the dot head 9 by B way is reduced to half in the size and mounted in the paper feeding direction A, the printing speed can be doubled with the dot heads 9 the same in the number as in the past.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire focus printer, and more particularly to a dot printer device that moves a dot head and enables high-speed printing using a dot configuration.

As an output device for computers and the like, dot-type printers, which print each character by forming a pattern using a collection of dots, are becoming faster and more widely used because of their ability to handle patterns of many types of characters.

A dot printer is constructed as shown in a perspective view in FIG. 1, for example. The printing mechanism is composed of a dot head mounting section 1, a paper feeding mechanism 2, and the like. This dot head mounting section 1 has printing paper 3 placed below it.
is hooked onto a tractor 4 provided in the paper feed mechanism 2 and set. One of the four drive shafts of the tractor 4 is connected to the shaft of the motor 6, and the other is fitted into a bearing 5 held by a frame (not shown). When the tractor 4 is rotated by the paper feed motor 6, the printing paper is sent in the direction indicated by the arrow. The dot head mounting portion 1 facing the printing paper 3 is controlled to reciprocate in the dot head swing direction B by driving a swing solenoid 8 of a swing mechanism 7 held by a bearing 5 of the frame. A plurality of dot heads 9 are mounted on the dot head mounting section 1, and the dot head 9 is driven by a swinging mechanism 7 to synchronously move a plurality of dot pins to an ink ribbon (not shown) or a printing paper 3 during reciprocating movement.
impact in the direction of the platen (not shown). At this time, characters and the like are formed on the paper surface by the dot pins of the dot head 9, and printing is performed.

By the way, in the conventional printing mechanism, the paper feeding mechanism 2 is fixed to the frame as shown in FIG. Since the dot head is moved in parallel and oscillated in the dot head oscillation direction B, the only way to reduce the oscillation period as a means of increasing printing speed is to increase the driving force of the oscillation mechanism 7. However, the printing speed of a dot printer is generally determined as follows.

N The number of vertical dots that make up the knee character.

m: Number of pins in the vertical direction of the head.

TA: The time (ms) required for one pin of the head to pass through the guideway.

TB: Head feed direction change time (ins) + (Note)
: Paper feeding time is included in Tn.

To determine the driving force from the equation ( ]), that is, if the displacement of the dot head 9 is χ-asinωt, the acceleration α is α=χ
=-ame2ain company, so 5 driving force F is F=fi
g a ooffi ω2 tamedokichi) "C, 'TA is the time for one way) Therefore, in order to make TA 10, F must be quadrupled, and in practical terms, the high speed of printing in the Hiko printing mechanism is It had the disadvantage of having limitations.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks, and to provide a dot-type printer device that doubles the relative movement speed of the dot head relative to the paper without changing the acceleration applied to the dot head swinging part, thereby enabling high-speed printing. The object of the present invention is to provide a dot printer device that moves a dot head in a direction perpendicular to the paper feed direction to form characters, etc. in a dot configuration on a printing paper surface, in which a paper feed mechanism and a dot head mounting section are moved in the paper feed direction. at right angles to, and
This is achieved by providing the printing 1 mechanism with means for swinging so that the phases are opposite.

In the figure, reference numeral 10 denotes a link mechanism, in which a paper swing cam 13 is engaged with the side plates 11, 11 and a paper swing cam 13 below the paper feed mechanism 2 via a paper swing section 12 on one side, and a dot head is mounted on the other. A dot head swing cam 15 is engaged with the part 1 via a dot head member 14. The side plate 11 and the paper swinging member 12 of the paper feeding mechanism 2, and the dot head swinging member 14 and the dot head mounting section 1 are each fixed. The swing cams 13, 15 are mounted with their phases shifted by 180 degrees so that the paper swing member 12 and the dot head swing member 14 are in opposite phases. That is, the arrow B' of the paper feed mechanism 2 and the arrow B of the dot head mounting section 1 move in relatively opposite directions. The dot loading section (14, 1) and the paper feeding section (
6, 11, 12) are held vertically by members not shown and are slidable in the B' and B directions.

In such a dot printer device, the swing cam 1 is rotated by the rotation of the swing motor 16 as shown in the arrow in FIG.
3.15, the paper feed mechanism 2°, that is, the paper 3 and the dot head mounting portion 1 move in opposite directions, so the relative moving speed of the drum head 9 with respect to the printing paper 3 becomes 2 times. Therefore, (a) the relative amplitude between the paper 3 and the dot head 9 is doubled, so the alignment pitch of the dot head 9 pins in the swing direction B can be doubled;
The pins (including printing magnets, etc.) can be lowered at the same printing speed, reducing printing system costs. (The drive circuit is also halved.) (B) If the dot head 9 (printing system) in the direction B is the same as the conventional one, and the half-reduced dot head 9 (printing system) is mounted in the paper feed direction A, then Cm ( Since the number of rows of pins in the vertical direction of the head 9 is doubled, the printing speed can be doubled with the same number of dot heads 9 (printing system) as before.

As explained above with reference to the embodiments, in the dot printer device according to the present invention, by operating the paper feed mechanism for the dot head in the opposite direction, it is possible to print at twice the speed of the conventional method, and it is also possible to print at the same speed. This will have great effects, such as cutting printing costs in half.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a printing mechanism showing the general structure of a conventional dot printer, and FIG. 2 is a perspective view of the printing mechanism of a dot printer according to an embodiment of the present invention. In the figure, 1 is a dot head mounting section, 2 is a paper feed mechanism, 3 is a printing paper, 4 is a tractor, 5 is a bearing, 6 is a paper feed motor, 7 is a swing mechanism, 8 is a swing solenoid, 9
is the dot head, 10 link mechanism, 11 is the side plate, 12
13 is a paper swinging member; 13 is a paper swinging cam; and 14 is a dot head swinging member. 15 indicates a dot head swing cam and a 16-piece swing motor, respectively. 7- Spear/Figure. 2 loaves of rod

Claims (1)

[Claims] In a dot printer that moves dots/dots in a direction perpendicular to the paper feeding direction to form a pattern of dots on the printing paper surface, both the paper feeding mechanism and the dot head mounting section are moved in the direction perpendicular to the paper feeding direction, and the dots are moved in opposite phases. A dot printer device characterized in that it is provided with means for swinging.