JPS6317065A - Print fouling protection board of line printer - Google Patents

Abstract

PURPOSE:To protect paper against foulding without fail and also cut during printing by forming a plurality of freely curving ribs which have a thickness slightly larger than the projecting height of a type and are inserted into between adjoining types and then forming a special chamfer on an external peripheral surface in the curving direction of the ribs. CONSTITUTION:The title print fouling protection board 23 consists of a plurality of parallel ribs 24 and continuous members 25, 26 which connect both ends of these ribs, integrally formed using an elastic synthetic resin and with slits 27 provided between the ribs 24. If the projecting height of a type 28 is h, the thickness t of the rib 24 is set slightly larger than h. On a surface on the printing hammer side 12 of the rib 24, a chamfer 29 is formed on both ends of each rib 24 in a longitudinal direction. During printing, paper,supported by the rib 24, is maintained afloat a little from a type 28 of a type wheel 11. Further, only a part hit by the printing hammer 12 contacts the type 28, thus performing the printing and protecting the paper against cuts by means of the chamfer 29.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a printing stain prevention plate for a line printer.

Conventional example Line printers conventionally used for registers, etc.
As shown in FIG. 8, a printing wheel 101 is provided in which a plurality of printed characters are arranged in the shoulder direction and formed over a plurality of digits.
1 is brought into contact with an ink roller 102, and a print hammer 103 provided for each digit is used to strike the paper 104 against the characters on the print wheel 101 to perform printing.

Further, a print stain prevention plate 105 is provided on the outer periphery of the print wheel 101. This print stain prevention plate 1o5 is to prevent ink from adhering to areas other than the printed characters due to contact of the paper 104 with adjacent characters when the printing hammer 103 hits the corresponding characters, and is made of a thin iron plate such as SUS. 106 and a support plate 107 that supports it. Then, as shown in FIGS. 9 and 10, the thin iron plate 106 has type 1
A plurality of slits 1 with a predetermined width H are formed to protrude 01a.
08 are arranged in the digit direction and are formed by a punching process such as a press, and the printing hammer 103 is used to hammer the paper 104 into the type 101a through the slit 10g.

Problem to be Solved by the Invention When forming such a print stain prevention plate 105, the paper 104 is lifted from the type 101a and the type 10 to be printed is removed.
Only the part of the paper 104 facing 1a is printed with its printed characters 101.
Since the hammer is applied to a, the plate thickness t of the thin iron plate 106 is set to type 10.
It is necessary to set the dimension to be larger than the protrusion height h of 1a.

However, increasing the plate thickness t means that the slit 1 of the predetermined width H
It becomes impossible to punch out 08. For this reason, conventionally, the thickness t of the thin iron plate 106 is made thinner than the protrusion height h of the type 101a, and the thin iron plate 106 is moved away from the printing shaft 101 by the elastic force of the support plate 107 as shown in FIGS. 11 and 12. It is installed in a floating position.

However, in this state, the striking force of the printing hammer 103 is attenuated by the spring pressure of the printing stain prevention plate 105, and the printing becomes thin.

Furthermore, when punching out the thin iron plate 106 using a press, an edge is formed at the opening edge of the slit 108, and the shearing action between this edge and the edge of the printing hammer 103 causes the paper 104 to
may break. Furthermore, there are problems in that mounting the print stain prevention plate 105 to the print shaft 101 and the print hammer 103 requires time to adjust the position and increases cost.

Means for Solving the Problems A line printer is provided with a printing shaft in which characters are arranged over a plurality of digits on the outer circumferential surface, an ink roller that comes into contact with the printing shaft, and a plurality of printing hammers that come into contact with and separate from the characters. , a plurality of bendable ribs each having a thickness slightly larger than the protruding height of the type characters and inserted between the type characters adjacent in the digit direction, and a continuous member connecting the ends of these ribs. and are integrally formed from a synthetic resin having elasticity, and chamfered portions are formed along both sides of the rib in the longitudinal direction on the surface on the outer peripheral side in the curved direction of the rib.

Therefore, the ribs lift the paper away from the type on the printing shaft and reliably prevent the paper from becoming dirty. Additionally, the chamfered portion of the rib prevents paper from tearing during printing.

Furthermore, by simply contacting the outer periphery of the ribbed printing shaft between adjacent type characters in the digit direction, it is possible to maintain the paper in a non-contact state with the type except during printing. and can be easily integrally molded.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 5 shows the internal structure of a line printer mounted on a register or the like.

That is, the printer main body l is provided with a paper receiver 4 that holds receipt paper 2 and journal paper 3 wound into a roll, and a rotatable take-up reel 5 that winds up the journal paper 3. , a paper path 7 that guides the receipt paper 2 and the journal paper 3 to the issuing port 6, and a slip path 9 that branches off from the middle of the paper path 7 and passes the slip paper 8.

The paper path 7 also includes a stamp 10 that contacts the receipt paper 2, a printing shaft 11, a printing hammer 12 that faces the outer periphery of the printing shaft 1, a paper feed roller 13, a pinch roller 14, and a fixed blade. 15 and a movable blade 16 are arranged. A paper feed roller 17 is provided in the other slip path 9. The pinch roller 14 is held by a swinging member (not shown) and is selectively brought into contact with either the paper feed rollers 13 or 17. An ink roller 18 impregnated with ink is elastically brought into contact with the lower outer periphery of the printing shaft 11. A plurality of printing hammers 12 are arranged in the digit direction which is the axial direction of the printing shaft 11, and each printing hammer 12 is arranged in a column direction, which is the axial direction of the printing shaft 11.
The shaft 20 is biased in the direction away from the printing shaft 11 by
A plurality of electromagnets 22 are provided, which are rotatably held by the printer and which make these printing hammers 12 face a rotating power shaft 21 .

A print stain prevention plate 23 that contacts the upper outer peripheral surface of the print shaft 11 is provided. As shown in FIG. 1, this printing stain prevention plate 23 is made by integrally forming a plurality of parallel ribs 24 and continuous members 25 and 26 that connect both ends of these ribs 24 using an elastic synthetic resin. It was formed. A slit 27 is formed between each rib 24. On the other hand, as shown in FIGS. 3 and 4, the printing shaft 11 is
A large number of printed characters 2 arranged in the circumferential direction and the axial direction (digit direction)
It has 8. If the protruding height of these letters 28 is h, then the thickness t of the ribs 24 is set to be slightly larger than h. On the surface of the rib 24 on the printing hammer 12 side, chamfered portions 29 are provided on both sides along the longitudinal direction of each rib 24.
is formed. That is, the rib 24 is formed to have a semicircular cross-section. Continuous members 25, 26 are ribs 24
The continuous member 25 has a mounting hole 3o formed therein, which is thicker than the thickness t of the printer main body l.

Such a printing stain prevention plate 23 maintains its flat shape by its own elasticity when it is alone, but when it is attached to the printer main body 1, it is elastically curved and the continuous member 26
comes into contact with a portion 7a of the paper path 7, and the ribs 24 are located between adjacent type characters 28 and come into contact with the outer periphery of the print shaft 11.

In this configuration, when feeding the receipt paper 2 and the journal paper 3, these papers 2.degree.3 are held between the paper feed roller 13 and the pinch roller 14. When feeding the slip paper 8, the paper feed roller 17 and the pinch roller 1 are used.
4.

Printing is then performed by striking the receipt paper 2 and journal paper 3 or slip paper 8 on the printing shaft 11 with the printing hammer 12. At this time, the paper 2, 3.8 is supported by the ribs 24 and maintained in a slightly floating state from the type 28 of the printing shaft 11, and only the portion struck by the printing hammer 12 contacts the type 28, thereby Printing is done.

Although printing is performed in this manner, the chamfered portion 29 of the rib 24 can prevent the sheets 2, 3.8 from being cut during printing. Furthermore, by simply bringing the rib 24 into contact with the outer periphery of the printing shaft 11 between the type characters 28 adjacent in the digit direction, the sheets 2, 3.8 can be set in a non-contact state with respect to the type 28 except during printing. . Furthermore, since the sheets 2, 3.8 are not subjected to pressure from the ribs 24 toward the printing hammer 12 side, the striking force of the printing hammer 12 is not attenuated, thereby making it possible to obtain a dark printing condition. . Moreover, the plurality of ribs 24 and the continuous members 25 and 26 can be easily integrally molded.

As shown in FIGS. 6 and 7, a metal mounting plate 31 such as an iron plate is fixed to the continuous member 25 of the printing stain prevention plate 23 with screws 32, and this mounting plate 31 is attached to the printer main body 1. It can also be installed on. As a result, the print stain prevention plate 2
The area of 3 can be reduced and the cost of expensive synthetic resin materials can be reduced.

Effects of the Invention Since the present invention is constructed as described above, the ribs can lift the paper from the type on the printing shaft to reliably prevent the paper from getting dirty, and the chamfered portions of the ribs prevent the paper from breaking during printing. Furthermore, by simply bringing the ribs into contact with the outer periphery of the printing shaft between adjacent type characters in the digit direction, it is possible to maintain the paper in a non-contact state with the type except when printing. Moreover, it has the advantage that the plurality of ribs and the continuous member can be easily integrally molded.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a plan view of a print stain prevention plate, FIG. 2 is a side view showing the relationship between the print stain prevention plate and the printing wheel, Figure 3 is a front view showing the relationship between the print wheel and the print hammer with the printing smudge prevention plate in cross section, Figure 4 is a partially vertical front view showing an enlarged view of the relationship between the ribs and type, and Figure 5 is a side view showing the overall structure;
6 and 7 show modified examples of the present invention, in which FIG. 6 is a plan view of the print stain prevention plate, FIG. 7 is a side view thereof,
Figures 8 to 12 show conventional examples, with Figure 8 being a side view showing the mounting state of the print stain prevention plate, and Figure 9 being a plan view showing the relationship between the printing wheel and the print stain prevention plate; Figure 10 is an enlarged sectional view of a part of the print stain prevention plate, Figure 11 is a front view of the print-stain prevention plate in cross section and shows the relationship between the print wheel and the print hammer, and Figure 12 is a cross-sectional view of the print-stain prevention plate. FIG. 3 is an enlarged cross-sectional front view showing the relationship between the print smear prevention plate, the print wheel, and the print hammer. 11... Printing wheel, 12... Printing hammer, 18...
Ink roller, 24...rib, 25.26...continuous member, 28...type, 29...chamfer part applicant Tokyo Electric Co., Ltd. Figure 32 1.3S J u figure 36 countries 17 figures 3 δ figures 39 figures

Claims (1)

[Claims] In a line printer equipped with a printing wheel in which characters are arranged over a plurality of digits on the outer circumferential surface, an ink roller in contact with the printing wheel, and a plurality of printing hammers that approach and separate from the characters, each of them is lower than the protruding height of the characters. A plurality of bendable ribs having a slightly larger thickness and inserted between the type characters adjacent in the digit direction, and a continuous member connecting the ends of these ribs are made of elastic synthetic resin. 1. A printing stain prevention plate for a line printer, characterized in that the rib is integrally formed with the rib, and a chamfered portion is formed along both sides of the rib in the longitudinal direction on a surface on the outer peripheral side in the curved direction of the rib.