JPH03190750A - impact dot printer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an impact dot printer that prints characters, figures, etc. using a dot matrix.

[Conventional technology]

In the conventional technology, the printing wire is guided from the printing wire guide member located closest to the printing object so that the printing wire protrudes perpendicularly to the printing object, and the printing wire is ink-free. The position where the ribbon collides with the object to be printed and the position of the hole through which the printing wire is passed provided in the printing wire guide member closest to the object to be printed overlap when viewed from the direction perpendicular to the object to be printed. It was set to .

[Problem to be solved by the invention]

However, in such conventional impact dot printers, the position of the hole through which the printing wire is passed, which is provided in the printing wire guide member located at the position closest to the printing object when viewed from the direction perpendicular to the printing object, and the ejecting position of the printing wire are determined. Otherwise, the printing wire guide member bends the printing wire, so the printing wire may break due to repeated bending stress generated on the printing wire, and the printing wire guide member may break due to the bending reaction force exerted by the printing wire on the guide member. There have been problems with the energy conversion efficiency (LN) associated with printing due to wear and sliding resistance between the printing wire and the guide member. Therefore, in order to solve these conventional problems, the present invention Even when the position of the hole through which the printing wire passes, which is provided in the printing wire guide member closest to the printing object when viewed from the direction perpendicular to the surface, and the printing wire ejection position are not overlapped, the printing wire may be broken or printing may occur. Does not cause wear on the wire guide member,
) It is an object of the present invention to provide an invac 1-dot printer that has a long life and high energy conversion efficiency.

[Means to solve the problem]

In order to solve the above problems, the impact dot printer of the present invention prints at a position where a straight line connecting the position where the printing wire collides with the printing object via the ink ribbon and the position where the printing wire is ejected intersects with the member that guides the printing wire. It is characterized by guiding the printing wire by providing a hole through which the wire passes.

[Function] The impact dot printer configured as above is
Since the printing wire does not bend, there is no risk of breakage of the printing wire due to repeated bending stress, wear of the printing wire guide member, or decrease in printing energy conversion efficiency due to sliding resistance between the printing wire and the guide member, resulting in a long life and high efficiency. It is possible to measure the

〔Example〕

Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a schematic plan view of an impact dot printer showing an embodiment of the present invention. An impact dot head 2 mounted on a carriage 1 movably supported in the 0-line direction is used to print an image between a platen 3 and an ink ribbon 4. Desired characters 9, figures, etc. are printed on the printing paper 5 placed in the area. FIG. 2 is a sectional view showing the positional relationship among the impact dot head, ink ribbon, and printing paper according to the embodiment of the present invention. The operation of the printing wire 6 in the embodiment of the present invention will be explained using FIG. The print lever 8 to which the plunger 7 is fixed is pushed toward the side yoke 10 by a spring 9 that presses the rear end.
For this reason, the tip is abutted against 11 per degree. On the other hand, the printing wire 6 with the button 12 fixed to the rear end connects to the hole 14 provided in the guide member 13 and the guide portion! Hole 16 made in 415
It passes through the hole 26 provided in the guide member 25 and is pressed against the tip of the print lever 8 via the button 12 by the force of the return spring 17, and is in a standby state. When the coil 18 is energized, a magnetic flux is generated in the magnetic circuit composed of the core 19, yoke 20, side yoke 10, and plunger 7, and a bow absorption force is generated between the plunger 7 and the core 19. Because the plunger 7 is attracted toward the core 19 by this suction force, the print lever 8
The wire 6 rotates around the fulcrum 21 in the direction of 81 in FIG.
launch. The printing wire 6 is connected to guide members 13, 15 and 2.
After printing, the printing wire flies to the right in FIG. 6 is returned to the standby position by the force of a return spring 17, and the print lever 8 is returned to the standby position by the force of a presser spring 9. FIG. 3 is a schematic explanatory diagram of the internal structure of the impact dot head 2 taken along the cross section B-H in FIG. 1. Print lever 8 is 40°
It is arranged in evenly divided increments. FIG. 4 shows a partially enlarged view of the central part of FIG.
a position 22 where it collides with the printing paper 5 through the guide member, a hole position 14 provided in the guide member. 16. 26, the relationship between the printing wire 6 emitter position 23 will be explained. The positions 23 from which the printing wire 6 is ejected are located at equally divided points every 40° on the same circumference 27,
The printing wire 6 passes through the ink ribbon 4 to the printing paper 5 (the nailing positions 22 are located on a vertical line at a pitch of 1/72 inch, for example. The wire 6 moves along a straight line 24 connecting the point 22 where the wire 6 collides with the printing paper 5 via the ink ribbon 4, and the holes 14, 16 provided in the guide members 13, 15, 25 move.
．． 26. As shown in FIG. 2, there is a horizontal distance between a position 22 where the printing wire 6 collides with the printing paper 5 via the ink ribbon 4 and a position 23 where the printing wire 6 is ejected, and the printing occurs when the printing wire 6 passes through the ink ribbon 4. The ratio A/L of the horizontal hole HA of the hole 14 provided in the guide member 13 at the position closest to the printing paper 5 to the position 22 where it collides with the paper 5 is the printing wire 6 in the plane perpendicular to the printing paper 5 and including the straight line 24. Projection distance l on a plane parallel to the printing paper 5 at the position 22 where the printing wire 6 collides with the printing paper 5 via the ink ribbon 4 and the printing wire 6 ejecting position 23 The printing wire 6 prints via the ink ribbon 4 The printed paper 5 in the hole 14 provided in the guide part 413 located at the position 22 where it hits the paper 5 and the position closest to the printed paper 5.
Projection distance a onto a plane parallel to . The ratio of a. /l, is equal to.

Therefore, as shown in FIG. 4, only one hole 14) is provided in the guide portion 413 at the position closest to the printing paper 5 on the projection plane parallel to the printing paper 5, and the printing wire 6 Position 2 where fIj hits the printing paper 5 via the ink ribbon 4
2, it is located at a point moved by ao on the straight line 24 toward the position 23 where the printing wire 6 is ejected. Further, the positions of holes provided in other guide members can be determined in a similar manner. The printing wire 6 is connected to the ink ribbon 4 on the projection plane parallel to the printing paper 5.
Position 22 where f#j hits the printing paper 5 via the guide member 1
The positions of the hole 14 provided in the guide member 3, the hole 16 provided in the guide member 15, and the hole 26 provided in the guide member 25 are shown independently as shown in FIGS. 5, 6, 7, and 8. As explained above, the straight line 24 connecting the position 22 where the printing wire 6 collides with the printing paper 5 via the ink ribbon 4 and the position 23 from which the printing wire 6 is ejected intersects with the guide members 13, 15, and 25. Since the holes 14, 16, and 26 are provided at the positions, the printing wire 6 has a straight shape and is not bent. Therefore, the printing wire 6 is broken due to retraction bending stress, the guide members 13, 15, and 25 are worn out due to the bending reaction force exerted by the printing wire 6 on the guide members 13, 15, and 25, and the printing wire 6 and the guide members 13, 15 are damaged. The problem of a decrease in energy conversion efficiency regarding printing due to the sliding resistance between 25 and 25 does not occur. In this embodiment, the printing wire 6 is not fixed to the lever 8. However, even if the printing wire 6 is fixed to the lever 8, the position 23 where the printing wire 6 is ejected and the position closest to the position 23 where the printing wire 6 is ejected are A similar effect can be obtained if a sufficient distance between the guide members 25 is ensured.

Further, the printing wire 6 is connected to the printing paper 5 via the ink ribbon 4.
The arrangement of the 1it 22 was made in the form of a vertical line with a pitch of 1/72 inch, but it goes without saying that any arrangement is possible.

〔Effect of the invention〕

As explained above, the impact dot printer of the present invention has a hole through which the printing wire is passed at a position where a straight line connecting the position where the printing wire hits the printing paper via the ink ribbon and the position where the printing wire is ejected intersects with the guide member. Because of this, the printing wire is straight and does not bend. Therefore, the printing wire may break due to repeated bending stress, and the guide member may wear out due to the bending reaction force exerted by the printing wire on the guide member.
There is no reduction in energy conversion efficiency related to printing due to sliding resistance between the printing wire and the guide part II, and there is an effect that a long life and high efficiency are possible.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an impact dot printer showing an embodiment of the present invention. FIG. 2 is a sectional view showing the structure of the impact dot head of the present invention and the positional relationship between the ink ribbon and printing paper. Figure 3 is a cross section of Figure 1 + ri + B
FIG. 3 is a schematic explanatory diagram showing the internal structure of the impact dot head in FIG. FIG. 4 is a partially enlarged view of the central part of FIG. 3. FIG. 5 is a diagram showing a position 22 where the printing wire 6 collides with the printing paper 5 via the ink ribbon 4. FIG. 6 is a diagram showing the position of the hole 14 provided in the guide member 13. FIG. 7 is a diagram showing the position of the hole 16 provided in the guide member 15. FIG. 8 is a diagram showing the position of the hole 26 provided in the guide member 25. 1... Carriage 2... Impact dot head 3... Platen 4... Ink ribbon 5... Print paper 6... Print wire 7... Plunger 8... Print lever 9... Presser spring 10... Side yoke 11... Per degree 12... Button 13... Guide member 14... Hole 15... Guide member 16... Hole 17... Return spring 18... - Coil 19...Core 20...Yoke 21...Fully point 22...Printing wire 6 passes through ink ribbon 4 to printing paper 5 (Collision position 23...Position where printing wire 6 is ejected) 24... Straight line connecting 22 and 23 25... Guide member 26... Hole 1 Figure 27... Above the circumference where the position 23 from which the printing wire 6 is ejected exists

Claims (1)

[Claims] The ink ribbon is equipped with a print head having a plurality of printing wires and a row direction moving means for moving the print head in the row direction, and selectively moves the printing wires forward and backward while moving the print head in the row direction. In an impact printer that performs impact printing on a printing object through an ink ribbon, a straight line connecting a position where the printing wire collides with the printing object via the ink ribbon and a position where the printing wire is ejected guides the printing wire. An impact dot printer characterized in that the printing wire is guided by providing a hole through which the printing wire passes at a position where it intersects with a member.