JPH0252753A - Moving coil type printing head - Google Patents

Abstract

PURPOSE:To reduce energy loss, and to increase working speed by installing an elastic member engaged with a coil base on the midway of printing operation. CONSTITUTION:A support member 21 has a small spring constant, and generates only load required for pushing a coil base 2 against a back stopper 17. An elastic member 22 is mounted so as to start its engagement with the coil base 2 when a printing pin 6 is moved in the left direction by the printing operation of the coil base 2 and projected only by approximately the same quantity. The coil base 2 continues printing operation while elastically deforming the elastic member 22 after the elastic member 22 starts its engagement, and restoring force is imparted to the coil base 2 at the time of printing when the printing pin 6 pushes a blank form 100 against a platen 18. Restoring force to the coil base 2 at the time of printing is given by energy stored in the support member 21 and the elastic member 22, and takes a value sufficient for preventing the breaking of the tip of the printing pin 6.

Description

[Detailed Description of the Invention] [Summary] Regarding the structure of a moving coil type print head used in an impact type wire dot printer, the purpose of the present invention is to reduce energy loss during printing operation and increase speed. A moving coil type print head that includes a printing pin and a coil that constitutes a linear motor between a fixed magnet and performs printing by a printing operation in one direction of a coil base that is elastically supported by a support member.
An elastic member is provided that engages with the coil base during the printing operation of the coil base, and the energy accumulated in the elastic member after engagement with the coil base reduces the return force to the coil base during printing. The configuration is such that a portion of the information is granted.

[Industrial application field]

The present invention relates to the structure of a moving coil type print head used in an impact type wire dot printer.

Impact-type wire dot printers are capable of printing Chinese characters and simultaneous copy printing, so the market is expanding, and as a result, even higher speeds are desired.

Therefore, a moving coil type print head is used because it is suitable for high-density packaging.

[Conventional technology]

FIG. 5 is a partially exploded perspective view showing the structure of a conventional moving coil type print head, and FIG. 6 is a plan view showing the main parts of FIG. 2 rows of moving coil parts, 3 is a magnet, 4 is a case, 5
is a heat sink.

As shown in detail in FIG. 7, the coil base 2 has a printing pin 6 at its tip, and its base is fixed and supported by a resin 9 to a fixed part 7 of the case 4 via a leaf spring (supporting member) 8. . Further, a coil lO is attached to one side of the base 2, and a connection member (flexible printed board) 11 is attached to the other side, and each end of the coil 10 is attached to an opening 12 formed in the coil base 2. Through connection member 1
It is connected to the terminal portion (copper foil portion) 13 of No. 1 . Terminal part 1
3 is a vinyl-covered wire 1 on the drive circuit (printed board) 14.
Connected by 5.

The magnets 3 are arranged in parallel at regular intervals, and the coil base 2 is located between adjacent magnets 3. The coil 10 provided on the coil base 2 and the magnet 3 constitute a linear motor.

The heat dissipation plate 5 is integrally provided with a heat dissipation fin 16, and is attached to the protrusion 4a of the case 4 in contact with the end surface of each magnet 3. 17 is a back stopper attached to the heat sink 5.

The moving coil parts 1 in each row are vertically reversed and assembled so that the printing pins 6 are lined up in a row.

For printing, move this print head to the platen 18 (see Figure 6).
This is performed by moving the coil 10 along the coil base 2 and energizing the coil 10 of a predetermined coil base 2 at a predetermined time. Due to this energization and the magnetic field of the magnet 3, the coil base 2 rotates counterclockwise in FIG. 7 while elastically deforming the leaf spring 8. stand out. The protruding printing pin 6 presses the paper 100 against the platen 18 via the ribbon 101, thereby performing printing. Energization to coil IQ is stopped immediately before printing is completed, and printing pin 6, which has completed printing, returns to its original position together with coil base 2, which is biased clockwise in FIG. 7 by leaf spring 8. The restored coil base 2 is
It is locked by the back stopper 17.

[Problem to be solved by the invention]

In conventional print heads with this type of configuration, in order to prevent the tip of the print bottle from breaking due to ribbon catching during printing,
The leaf spring 8 applies a restoring force of 40 to 50 g to the printing pin 6 when it collides with the paper, resulting in energy loss.

SUMMARY OF THE INVENTION An object of the present invention is to provide a moving coil type print head that can reduce energy loss during printing operations and increase printing speed.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a printing pin;
In a moving coil type print head that prints by a printing operation in one direction of a coil base that is elastically supported by a support member and includes a coil that constitutes a linear motor between the coil base and a fixed magnet, the coil base prints. An elastic member is provided that engages with the coil base during the operation, and the energy accumulated in the elastic member after engagement with the coil base provides part of the return force to the coil base during printing. The configuration is as follows.

[For production]

At the beginning of the printing operation of the coil base, the coil base moves toward the printing section while elastically deforming the support member. During this movement, the coil base engages with the elastic member, and thereafter continues to move while elastically deforming the elastic member and the support member, and finally printing is performed. The return force to the coil base during printing is determined by the support member,
It is imparted by energy stored in the elastic member.

Therefore, for example, if the tip of the printing pin is 0.3
*■ By making the elastic member start to engage with the coil base when it protrudes, the return force during printing can be set to a value of 40 to 50 g even if a supporting member weaker than the conventional one is used. As a result, it is possible to solve the problem of a considerably large energy loss over the entire stroke of the printing pin in the case of the conventional system in which the leaf spring was used both for supporting the coil base and for applying the return force.

〔Example〕

The present invention will now be described in detail with reference to FIGS. 1 to 4.

A first embodiment is shown in FIGS. 1 and 2.

FIG. 1 is a side view showing the main structure of a moving coil type print head according to the present invention, in which 21 is a support member;
is an elastic member. Note that the same reference numerals as in the past are given to members having the same configuration as in the past.

The support member 21 has a smaller spring constant than the conventional leaf spring 8 and generates only the load necessary to press the coil base 2 against the back stopper 17.

This spring constant is set to, for example, 5 to 10 g/mm, and the pressure force of the coil base 2 against the back stopper 17 in this case is about 5 g/mm.

The elastic member 22 releases the coil when the printing pin 6 moves 0.3 m to the left due to the printing operation of the coil base 2 (rotating operation counterclockwise in the figure) and protrudes from the pin guide 19 by approximately the same amount. It is provided so as to start engaging with the base 2.

Therefore, after this engagement starts, the coil base 2 continues the printing operation while elastically deforming the elastic member 22, and the printing pin 6
When printing presses the paper 100 against the platen 18,
A return force of 40 to 50 g is applied to the coil base 2. This return force is a combination of the urging forces of both the support member 21 and the elastic member 220, and FIG. 2(a) shows the progress of generation of this return force. The horizontal axis of the figure shows the printing pin 6.
The vertical axis represents the return force. As is clear from this figure, at the beginning of the stroke, only the support member 21 acts and the return force is small, but when the elastic member 22 starts to engage at the time of stroke 3 am, the subsequent return force increases stepwise. becomes larger.

In this way, in the present invention, the return force to the coil base 2 during printing is generated by the support member 21, the elastic member 2
It is given by the energy accumulated in the printing pin 2, and has a value sufficient to prevent the tip of the printing pin 6 from breaking.

By the way, in the conventional system in which the leaf spring 8 is used both for supporting the coil base 2 and for applying the restoring force, the relationship between the printing pin stroke and the restoring force changes linearly as shown in FIG. It is clear that there is a considerably large energy loss compared to the stepwise variation in FIG. 2 (alO) of the present invention.

In this way, in the present invention, energy loss is reduced and the heat generation of the coil 10 is reduced, so that high speed operation is possible.

FIG. 3 shows a second embodiment.

In this example, an elastic member 31 of a coil spring is disposed between the coil base 2 and the pin guide 19'.

This elastic member 31 starts engaging with the coil base 2 when the printing pin 6 moves approximately 0.3 m to the left.

In the case of this example as well, it is possible to achieve the same effects as in the previous example.

Fourth, a third embodiment will be described.

In this example, the fixed portion 7 is provided with a cantilevered elastic member 41 made of a spring material. When the printing pin 6 moves to the left by about 3w, the elastic member 41 is connected to the coil base 2 through the support member 21, etc., which has been elastically deformed by a predetermined amount.
start engaging with.

In the case of this example as well, it is possible to achieve the same effects as in the previous example.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce energy loss during printing operation and increase printing speed.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the main structure of a moving coil print head according to a first embodiment of the present invention, and FIGS. 2(a) and 2(b)
) is an explanatory diagram of the same operation, and FIG. 3 is a side view showing the main structure of a moving coil type print head according to a second embodiment of the present invention.
FIG. 4 is a side view showing the main structure of a moving coil print head according to a third embodiment of the present invention, FIG. 5 is a perspective view showing the structure of a conventional moving coil print head, and FIG. 5 is a plan view showing the main parts of FIG. 5, and FIG. 7 is a side view showing details of the coil base shown in FIG. is a support member (leaf spring), and 22.31.41 is an elastic member.

Claims (1)

[Claims] A coil base (2) that includes a printing pin (6) and a coil (10) that constitutes a linear motor between a fixed magnet and is elastically supported by a support member (21). In a moving coil type print head that prints by a printing operation in one direction, an elastic member (22) is provided that engages with the coil base (2) from the middle of the printing operation of the coil base (2), and the coil base A moving coil characterized in that a part of the return force to the coil base (2) during printing is applied by energy accumulated in the elastic member (22) after engagement with the coil base (2). type print head.