JPS584680Y2 - Printing pressure adjustment mechanism of printing hammer in printer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a printing pressure adjustment mechanism for a printing hammer in a serial printer, particularly a small serial printer used as a printing mechanism for desktop calculators and measuring instruments.

The printing mechanism of small serial printers used for desktop calculators, etc. consists of a type ring with type around it and movable in the line direction, and a print ring that is the length of one line and is pivoted so that it can swing freely. It has a hammer and a plunger mechanism that drives the printing hammer, and when the type wheel is positioned at the lowest digit and the desired type reaches the printing position, the plunger mechanism is driven and the printing hammer is driven to print the desired type. The recording paper inserted between the printing hammer and the inked type is pressed against the type to print the lowest digit, and then the type wheel is moved to the next printing digit to perform the printing operation as described above. do it repeatedly,
After performing several printing operations, one line of printing is completed.

By the way, in the printing mechanism as described above, the mechanism for transmitting the driving force of the plunger mechanism to the printing machine has the following structure.

That is, a protrusion having an inclined surface is provided on the back surface of the printing hammer, and an operating rod is provided in which the cam portion at the tip contacts the actual inclined surface and is rotatably supported. The operating rod is rotated by operating the lever, and the force of the operating rod presses the slope of the protrusion with the cam part to drive the printing hammer, but the position of the cam part of the operating rod and/or the slope of the projection If the accuracy is poor, there will be variations in the impact force of each printer's print mark, causing the inconvenience that the print density will not be constant.As a result, many products will be defective due to uneven print density during the inspection process of the printer. Ta.

Although it is possible to make the print density uniform for each printer by adjusting the position of the plunger mechanism, the plunger mechanism can also be used as a power source for other power sources, such as for feeding the type wheel. Because of this, it is impossible to move its position in relation to other mechanisms.

The present invention is a new invention to improve the above-mentioned disadvantages, and its purpose is to adjust the printing density with a simple structure in a serial printer that performs printing by driving a printing hammer by the driving force of a plunger mechanism. The purpose is to provide an adjustment mechanism that allows for

Next, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, 1 is a bottom plate forming the chassis of the serial printer, and 2 and 3 are side walls erected on both sides of the bottom plate 1.

Reference numeral 4 denotes a remule that is hung between both side walls 2 and 3, and 5 a carriage that moves left and right on the rail 4 and holds a type wheel 6.

I is a rotating shaft rotatably supported by the side walls 2 and 3.

Central part 1a of the rotation axis I where the vfI metaphysical surface is approximately oval shaped
is connected to the type wheel 6 by a spline shaft, and the carriage 5
At the same time, the type wheel 6, which moves in the left and right direction, is rotated.

Numeral 8 is a gear that transmits the rotational force of a motor or the like to the rotating shaft I, 9 is a recording paper, 10 is a wire that pulls the carriage 5 to the left to carry up, and 11 is a wire that pulls the carriage 5 to the right to move the carriage 5. This is a return spring that returns to the bottom row digit.

12 is a printing hammer. The printing hammer 12 is rotatably supported on the side walls 2 and 3 by pivot joints 12a and 12b.

On the back of the printing hammer 12, as shown in FIG.
A cam portion 12d having an inclined surface 12c is provided.

Two protrusions 12e are formed at the lower end of the protrusion 12e, which are arranged to face each other.

Note that 12f and 12g are position adjustment protrusions.

13 is a hammer position adjustment plate (...hammer position adjustment member)
It is.

A slit 13b is provided in the base 13a of the mer position adjustment plate 13, and the engaging portion 13c at the tip fits into the slit N2h formed between the two protrusions 12e.

14 and 15 are guide rails formed on the bottom plate 1;
A base portion 13a of the controller position adjusting plate 13 is fitted between these guide rails 14 and 15.

16 is a screw that passes through the sulin N3b and is screwed into the bottom plate 1 to fix the position adjusting plate 13.

Reference numeral 17 denotes a lever whose center portion is rotatably supported by a pin or the like, and its tip portion 17a is in contact with an inclined surface 12c of a cam portion 12d provided on the back side of the printing mark 12.

A plunger 18 has a shaft (operating rod) 18a connected to an end 17b of the lever 17.

In the printer having the above configuration, the recording paper 9
To print on the image, a voltage is applied to the (electromagnetic) plunger 18 to cause its shaft 18a to protrude in the direction of arrow A, and the lever 17 is rotated in the direction of the arrow.

As the lever 17 rotates, its tip 17a is moved to the cam portion 12.
Press the inclined surface 12c of d, rotate the print mark 12, press the recording paper 9 against the type ring 6, and press the recording paper 9 against the type ring 6.
When the desired characters are printed on the printer and the printing operation is completed and the plunger 18 is released from the bias, the printing hammer returns to the state shown in FIG. 1 by a spring not shown.

If the print density of the characters printed by this printing operation is lighter than the specified value, loosen the screw 16, insert the tip of a screwdriver between the side wall 3 and the protrusion 12g, and rotate it.・After moving the printer 12 by a predetermined amount to the left in Fig. 1, tighten the screw 16 to print.
Fix the marker 12 in the new position.

This operation increases the printing pressure of the printing hammer and increases the printing density.

If the print density is darker than the specified value, loosen the screw 16, insert the tip of a screwdriver between the side wall 2 and the protrusion 12f, and rotate it to apply a predetermined amount of the print mark 12 (Fig. 1). After moving the print hammer 12 to the right, tighten the screw 16 to fix the print hammer 12 in the new position.

Due to this operation, the printing pressure of the printing mark decreases, and the print density decreases.

In the above embodiment, the printing mark 12 is provided with two protrusions 12e, and the slit 1 between these two protrusions 12e is
2h is fitted with the engaging portion 13c of the hammer position adjustment plate 13, but instead of providing a protrusion on the printing mark 12, a slit is formed by drilling at a predetermined portion of the printing mark 12, and this slit Hammer position adjustment plate 13 inside
Even if the engaging portions 13c of the
The distal end of the engaging portion of the marker position adjustment plate 13 may be formed into a forked shape, and one protrusion provided on the printing marker may be sandwiched between the forked distal ends.

As explained in detail above, the present invention is a serial printer that performs printing by pressing a cam provided on the back of the printing marker, and is configured so that the printing marker can be moved slightly in the row direction. Furthermore, since the operating position of the printing mark can be changed by the printing mark position adjustment member that is engaged with the printing mark, the printing density of the printed characters can be freely changed.

Therefore, if the print densities of each printer are different when inspecting a serial printer, it is possible to adjust the uneven print densities to a constant value by adjusting the print/marker positions using each hammer position adjustment plate. This means that items that were previously treated as defective can now be made into good quality.

It also has the advantage of being extremely simple in terms of its housing and configuration, without the need for major changes to conventional devices.

[Brief explanation of the drawing]

FIG. 1 is a top view showing an embodiment of the present invention, and FIG. 2 is a top view showing an embodiment of the present invention.
FIG. 3 is an enlarged perspective view of a position adjustment portion of a printing hammer. In the figure, 1 is a bottom plate, 2 and 3 are side walls, 4 is a rail, 5 is a carriage, 6 is a type wheel, 7 is a rotating shaft, 7a is a center part, 8
1 is a gear, 9 is a recording paper, 10 is a wire, 11 is a return spring, 12 is a printing mark, 12a and 12b are pivot parts, 12c is an inclined surface, 12d is a cam part, 12e is a protrusion, 1
2f and 12g are projections, 12h is a slit, 13 is a hammer position adjustment plate, 13a is a base, 13b is a slit, 1
3c is an engaging portion, 14 and 15 are guide rails, 16 is a screw, 17 is a lever, 17a is a tip, 18 is a plunger, and 18a is a shaft.

Claims (1)

[Claims for Utility Model Registration] (1) A serial printer that performs printing by pressing a cam provided on the back of a printing hammer with a lever rotated by a plunger, which is movable in the row direction and positioned by a fixing means. In addition to providing a hammer position adjustment member to which the printing hammer is fixed, the printing hammer is movably supported in the row direction, and the printing hammer is fixed at a predetermined position by engaging the hammer position adjustment member and the printing hammer. A printing pressure adjustment mechanism for a printing hammer in a printer characterized by: (2) Claims for registration of a utility model in which the printing hammer and the hammer position adjusting member are engaged by fitting the tip of the mark position adjusting member into the slit formed between the second protrusions provided on the printing hammer. (i) A printing pressure adjustment mechanism of a printing hammer in the printer described in LJ. ”□(3) Printing: Utility model registration claim No. (1) in which the printing hammer and the hammer position adjusting member are engaged by fitting the tip of the hammer position adjusting member into a slit formed by drilling in the marker. Print pressure adjustment mechanism of the print hunter in the printer described in paragraph 4. (4) The protrusion provided on the print hammer is sandwiched between the forked tips provided on the hammer position adjustment member to engage the print hammer and the hammer position adjustment member. A printing pressure adjustment mechanism of a printing hammer in a printer according to claim (1) of the combined utility model registration claim.