JPS5811159A - Printing mechanism of printer - Google Patents

Abstract

PURPOSE:To make a printer smaller, thinner by a structure wherein a circular flexible belt bearing arranged types is revolved, desired types are stopped facing a hammer and printing is carried out by the hammer on a recording sheet. CONSTITUTION:Inside a flexible belt 1 such as rubber etc., projections engaging with the grooves 2a, 3a of a driving pulley 2 and a driven pulley 3 are provided so that the flexible belt 1 can be revolved by the rotation of the driving pulley 2. Besides, types 1b are provided on the flexible belt 1 corresponding to the projections 1a and an ink roll 4 is arranged so as to coat the surface of the types 1b with ink. The flexible belt 1 is revolved by the rotation of the driving pulley 2, a desired type 1c is selected by a selecting means 9 and brought into a standstill facing a hammer 7. Subsequently a recording sheet 5 is pressed by the hammer 7 on the type 1c to be printed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing mechanism for a mechanical printer that prints symbols or numbers, and more particularly to a printing mechanism for a printer in which characters are arranged on a flexible belt.

Recently, compact desktop calculators that can be held and operated with one hand have appeared among recording desk calculators that can record calculation processes and results.This is mainly due to the fact that printers that record calculations have become smaller than before. It depends on what happened. However, it is far from impossible to carry a recording desk calculator with a mechanical printer in your pocket. This is because it is impossible to make the type wheel type or type drum type mechanical printers, which are currently the mainstream, smaller or thinner due to the structure of the type array.

This will be explained with reference to FIG. FIG. 1 is a schematic side sectional view of a type drum type or type wheel type mechanical printer. Type letters 12 are arranged on the circumference of the type ring 11, and an ink roll 16 is provided in contact with the type letters 12 to apply ink. The recording paper 15 is fed by a paper feed roller 14
This is suitable for the gap formed between the hammer 13 and the type ring 11. In general, there are at least 12 types of 12 type characters arranged around the circumference of the type ring 11, and in addition to this, empty spaces (blank spaces) are used for printer control reasons as seen in Japanese Patent Laid-Open No. 56-28885. ) is further provided, and normally the arrangement interval of the type letters 12 of the type wheel 1] is equal to or more than 13 divisions of the circumference of the type wheel 11. The hammer 13 is used to press the recording paper 15 against the type 12 to print. However, if the height difference A between the adjacent type 12 ah and the block 12 b is too small, the adjacent type 12α and 126 will fall onto the recording paper 15. Touching causes print stains. In order to prevent this, measures such as those shown in Japanese Utility Model Application Laid-Open No. 54-68911 can be cited as an example, but even so, in order to prevent the above-mentioned contamination, the step size A needs to be about 0.4 u.

Assuming that the character height dimension B is generally about 2U and the number of divisions of the type ring 11 is 13, the minimum value of the outer diameter C of the type ring 11 to ensure a step size A of 0°4u is 15.2.
It will be about m. Therefore, even if we try to make type wheel or type drum type mechanical printers smaller or thinner than the current size, there is a limit to how small the outer diameter of the type wheel or type drum can be made.1 This is an obstacle. .

31 The present invention eliminates the above-mentioned drawbacks and aims to make a tower printer smaller and thinner. Still another object of the present invention is to provide a printing mechanism for a printer that does not cause print smear.

An embodiment of the present invention will be explained with reference to a side sectional view in FIG. 2 and a top view in FIG. 3. The flexible belt 1 is provided with a protrusion 1a on the inside, and this protrusion lα engages with the grooves 2α and 3α of the drive boot υ-2 and the driven pulley 3. When the drive pulley 2 rotates, the protrusion 1α of the flexible belt 1 Since the belt sequentially engages with the groove 2α of the drive pulley 2, no slippage occurs between the flexible belt 1 and the drive pulley 2.
The flexible belt 1 rotates in synchronization with the phase of the drive boob 11-2α. [Protrusion] Corresponding to a, flexible belt 1 has type 1.
, b are provided. Print 1. bK is ink roll 4
is pressed, and ink is applied to the surface of the type 1b. A recording paper 5 enters between the flexible belt 1 and the printer 7 and is fed by a paper feed roller 6.

During non-printing, the shaft 8 rotates, which causes the flexible belt 1 to rotate, but when an arbitrary type 1G is selected by the selection means 9, the main shaft 8 stops and the type IC is hammered. Stand still facing 7. Hammer 7 is recording paper 5
The flexible belt 1 rotates again when the shaft 8 is released by the selection means 9 which prints by pressing the character 1c onto the type 1c.

In such a printing mechanism, the step dimension A between the printed characters lc and the adjacent printed characters 1d can be arbitrarily selected depending on the arrangement interval of the printed characters 1b on the flexible belt 1 and the outer diameter of the drive pulley 2. can.

Moreover, the smaller the outer diameter of the drive boob 17-2, the higher the step dimension A.
This is very advantageous in preventing printing smudges. Therefore, in order to make the printer smaller and especially thinner, the flexible belt 1 should be used.
This increases the freedom of design without being constrained by the outer diameter of type wheels and type drums.

When carrying a recording desk calculator in your pocket, one of the prerequisites is that the overall thickness of the calculator should be thin. Furthermore, the thickness of a recording desk calculator is limited by the thickness of the printer inside. Therefore, one of the keys is whether the printer can be made very thin, and in this sense, by using the flexible belt 1, the printer can be made very thin.

As described above, according to the printer printing mechanism of the present invention, it is possible to make the printer smaller and thinner, and furthermore, it is possible to provide a printer that does not have smeared prints.

[Brief explanation of the drawing]

Fig. 1 shows a side sectional view showing the printing mechanism of a conventional type wheel type printer and a drum type printer, Fig. 2 shows an embodiment of the present invention; FIG. 3 is a top view. 1・＠・Flexible belt 2II・・Drive boo summer 1-3・
...Followed booby IJ-4...Ink roll 5...Recording paper 6...0 Paper feed roller 7...-Hammer
8... Axis 9... Selection means Shikiwa Sayakosha Co., Ltd. Agent Tsutomu Mogami

Claims (1)

[Claims] The printing mechanism of the printer that prints symbols or numbers.
a flexible belt in the shape of ff3J on which printed characters of symbols or numbers are arranged; a driving pulley and a driven pulley on which the flexible belt is mounted; and a recording paper is pressed against the printed characters on the flexible belt. The flexible belt rotates in synchronization with the driving pulley when not printing, and when printing, the flexible belt rotates in synchronization with the driving pulley when printing. A printing mechanism for a printer, characterized in that the printing type on the flexible belt is brought to a standstill by the hammer, and printing is performed on the recording paper by the hammer.