JPH04282260A - Sliding member surface structure of compact printer - Google Patents

Abstract

PURPOSE:To eliminate the contamination of a sliding member due to generated paper dust and restrict abrasion on account of sliding actin by adding a ceramic film of titanium chemical compound to the surface of the sliding member at the mechanical part of a compact printer. CONSTITUTION:A film 2 of titanium carbide is applied to the surface of a leaf spring 1 of stainless steel sliding member as a coating material. If the leaf spring 1 is assembled into a compact printer and then is activated, silicon dioxide or aluminum oxide 3 of generated paper dust happens to slide on the surface of titanium carbide 2. Even in this case, the hardness of about Hv3000 of the film itself of titanium carbide 2 is higher than that of about Hv2500 of silicon dioxide particle in printing sheet. Therefore, the abrasion caused by sliding action can be restricted significantly. Further, the recommended type wheel selection member is such one as having a ceramic film added and the recommended armature or armature return spring of an impact dot head is such one as having a ceramic film added.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface structure of a sliding member of a small-sized printer having a sliding member in a mechanism section.

0002

2. Description of the Related Art Conventionally, a typical example of this type of technology was to apply lubricating oil such as grease to the surface of a sliding member to improve lubricity.

0003

[Problems to be Solved by the Invention] However, in the above-mentioned prior art, the leaf spring 1 of the sliding member of the mechanism section of a small printer device is
04 and a sliding member 100 such as polyacetal,
Silicon dioxide and aluminum oxide 103 contained in white clay (a material contained in the paper manufacturing process) in paper dust generated from printing paper enters the resin, causing the sliding member 10
At 0, the sliding surface becomes file-like. As a result, as the usage time passes, the plate spring 104, which is softer than the silicon dioxide and aluminum oxide 103, is significantly worn away by the silicon dioxide and aluminum oxide 103, and as a result, printing becomes impossible for a long time. was.

0004

[Means for Solving the Problems] The present invention solves the above-mentioned drawbacks by adding a ceramic film made of a titanium compound to the surface of a swinging member of a small printer device having a sliding member in its mechanism. Features.

[0005] Furthermore, the selection member of the type wheel selection type is characterized in that a ceramic coating is added.

Furthermore, the impact dot head is characterized in that the armature or the armature return spring is coated with a ceramic coating.

[0007]

[Operation] According to the present invention, the ceramic film applied to the surface of the sliding member is composed of titanium carbide, so that when the sliding member is installed in a small printer device and operated, the ceramic film is generated from the printed paper. Even if the paper dust adheres to the surface of the ceramic film, the silicon dioxide particles in the paper dust (
Titanium carbide particles (hardness HV approx. 2500)
3000) is higher, the sliding member does not wear out, and wear due to sliding can be significantly suppressed.

[0008]

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3.
This is explained by:

FIG. 1 is an explanatory view showing the principle of the present invention, in which the surface of a plate spring 1, which is a sliding member made of stainless steel, is coated with a film 2 of titanium carbide. When the leaf spring 1 is installed in a small printer and operated, even if the silicon dioxide and aluminum oxide 3 of the paper dust generated from the printing paper slides on the surface of the titanium carbide 2, the hardness of the film of the titanium carbide 2 itself is approximately Since the hardness of Hv3000 is higher than the hardness of silicon dioxide particles in the printing paper, which is approximately Hv2500, wear due to sliding can be significantly suppressed.

FIG. 2 shows a type wheel selection type printing mechanism of a small printer device. When a printing command is input, the type wheel shaft 6 rotates in the direction of arrow A. The trigger magnet 14 is energized at the timing when the groove 12 of the type wheel shaft 6 is synchronized with the type. Then, the trigger suction plate 15 is attracted to the trigger magnet 14, and the trigger spring 4, which is a plate spring of the sliding member that is engaged with the trigger suction plate 15, also moves in the direction of arrow B, and stops engaging with the type ring claw 13. remove. On the other hand, type ring claw 1
3 rotates in the direction of arrow C around the type wheel pawl shaft 8 by the force of the type wheel pawl spring 5, and engages with the groove 12 of the type wheel shaft 6.

The trigger magnet 14 is connected to the type ring claw 13.
The energization time is set so that the type wheel reliably rotates in the direction of arrow C and engages with the groove 12 of the type wheel shaft 6, after which the energization is cut off. The trigger spring 4 returns to the standby state by its own spring force. The type wheel pawl 13 engaged with the type wheel shaft 6 rotates together in the direction of arrow A, and the sliding surface 13a rotates while sliding on the trigger spring 4. The type wheel 7 also rotates at the same time, and when the type wheel axle 6 rotates through a desired angle, the type wheel axle 6 and the type wheel 7 stop and proceed to the printing process.

The ink necessary for printing is supplied to the entire surface of the type by an ink roll (not shown).
When the type wheel 7 stops rotating, the print roller 11 driven around the crankshaft 10 operates in the direction of arrow D, and prints the print paper 9 sandwiched between the aligned type characters of the print roller 11 and the type wheel 7. Printing is performed by pressing.

FIG. 3 is a perspective view of the trigger spring 4, which is a plate spring of the sliding member of the first embodiment shown in FIG. 2 of the present invention. With such a mechanism, the trigger spring 4, which is a plate spring of the sliding member, is always in a sliding state with the type ring claw 13, and the generated paper dust is caused to move against the type ring claw of the trigger spring 4 as the number of printing increases. Enter the part where it slides with 13. The part that slides the most is the AA' part that slides on the type ring claw 13.

[0014] Therefore, by adding titanium carbide or titanium nitride to the surface of the trigger spring 4, including the A-A' portion that slides with the type ring claw 13, the thickness of the film is in the range of 2 to 10 μm, and printing is possible. Silicon dioxide and aluminum oxide 3 of paper dust generated from the paper enters the sliding surface 13a of the type ring claw 13, and the type ring claw 13 whose sliding surface 13a is shaped like a grindstone,
Even if the trigger spring 4 is slid, it will not wear out.

[0015] When the thickness of the ceramic film is in the range of 2 to 10 μm and paper dust is mixed in, the durability of the trigger spring 4, which is the plate spring of the swinging member, has decreased from 700,000 lines to 5,000,000 lines. The effect of improving above the line has been confirmed.

FIG. 4 shows a second embodiment of the present invention,
The impact dot head of a small printer device is shown.

By energizing the coil 22, the iron core 2
1 is excited and the plunger 23 fixed to the armature 26 is attracted. At this time, the center of rotation of the armature 26 is the fulcrum 28 of the armature 26 engaged with the pin 24 and the armature return spring 27.
The tip of the wire pin 25 hits the tip of the wire pin 25. The wire 20 is fixed to a wire pin 25, and strikes the platen 17 via the ink ribbon 19 and printing paper 18 to print.

With such a mechanism, the armature return spring 27, which is a sliding member, is always in a sliding state between the armature 26 and the fulcrum 28, and as the printing time increases, the generated paper powder is caused to move between the armature return spring 27 and the armature. It enters the fulcrum 28 of 26. Therefore, by using a structure in which titanium carbide or titanium nitride is added to the surface of the armature return spring 27, which is a plate spring of the sliding member, which wears against the armature 26, the wear can be significantly reduced.

Furthermore, it has been confirmed that even if a similar structure is used for the armature 26, wear of the armature 26 and the armature return spring 27 can be suppressed and similar effects can be obtained.

FIG. 5 shows a third embodiment of the present invention, and shows an impact dot head for a small printer. By energizing the coil 36, the iron core 37 is energized and the attraction iron core 37 fixed to the armature 31 is attracted. Further, a printing pin 34 fixed to the armature 31 is activated to strike the platen 32 via the ink ribbon 33 and printing paper 30 to print.

With such a mechanism, the armature return spring 29, which is a leaf spring of a sliding member, is always in a sliding state between the armature 31 and the point of action 39, and the generated paper powder moves to the point of action as the printing time increases. Go into 39 places. Therefore, the armature return spring 29, which is a leaf spring of the sliding member,
By using a structure in which titanium carbide or titanium nitride is added to the surface that rubs against the armature 31, wear can be significantly reduced.

Furthermore, it has been confirmed that even if a similar structure is used for the armature 31, wear of the armature 31 and the armature spring 29 can be suppressed and similar effects can be obtained.

[0023]

Effects of the Invention As described above, the present invention adds a ceramic film of a titanium compound to the surface of the sliding member of the printer, so that even when paper containing a large amount of white clay is used, the printing paper can be improved. Since the hardness of the ceramic coating film is about Hv3000, which is higher than the hardness of the silicon dioxide particles in the paper powder, which is about Hv2500, the generated paper powder does not enter the sliding member, and therefore the wear caused by sliding can be significantly suppressed. The durability of the sliding member is improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the principle of suppressing wear of a sliding member surface structure according to the present invention.

FIG. 2 is a sectional view showing a first embodiment of the invention.

FIG. 3 is a perspective view of a leaf spring of the sliding member according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing a second embodiment of the invention.

FIG. 5 is a sectional view showing a third embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an example of conventional technology.

[Explanation of symbols]

1. Plate spring of sliding member 2. Titanium carbide 3. Silicon dioxide or aluminum oxide 4. Trigger spring 9. Print paper 13. Type wheel claw 18. Print paper 26. Armature 27. Armature return spring 28... Fulcrum 29... Armature spring 30... Printing paper 31... Armature 39... Point of action 100... Sliding member 103... Silicon dioxide or aluminum oxide 104...
leaf spring

Claims (3)

[Claims] 1. A surface structure of a sliding member of a small-sized printer having a sliding member in a mechanism section, characterized in that a ceramic film of a titanium compound is added to the surface of the sliding member of the printer. 2. The surface structure of a sliding member of a small printer device according to claim 1, wherein the ceramic film is added to a selection member of a type wheel selection type. 3. The surface structure of a sliding member of a small printer device according to claim 1, wherein the armature or armature return spring of the impact dot head is coated with the ceramic film.