JPS6353036B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing mechanism for a typeface serial printer.

Conventionally, in this type of printing mechanism, the portion of the printing hammer that comes into contact with the type and applies an impact was a single unit.
Therefore, in the case of a type character, such as a period, which has a small area and is located at an uneven position compared to other type characters, printing is performed as shown in FIG. 1a. If the correspondence between the type head 12 and the hammer is slightly out of order, or if there is any play in the movement of the hammer, the finger on which the type is mounted should be moved as shown by the dotted line as shown in Figure 1b. Force was applied in the direction of bending, significantly reducing the lifespan of the type. Further, when the amount of deflection is large, a part of the finger comes into contact with the platen, resulting in ghost printing.

In the present invention, the movable part of the printing hammer that contacts the type head and applies an impact force in the printing mechanism is divided into two or more parts so that they can be driven independently to correspond to the shape of the type to be printed. By driving the movable part of the printing hammer only partially, the above disadvantages are overcome, the life of the type head is extended, and a printing mechanism is provided which does not cause ghost printing.

According to the invention, a type head mounted with type;
In a printing mechanism consisting of this type head and a printing hammer that applies an impact force to the surface opposite to the type surface of this type head to print, a movable part that contacts the printing head of the printing hammer to apply an impact is used. The printing hammer is divided into at least two parts, means for independently driving each of the movable parts, and the printing hammer is driven in accordance with the shape of the type to be printed. A printing mechanism is obtained.

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

FIG. 2 is a perspective view showing essential parts of an embodiment of the present invention. In FIG. 2, one embodiment of the present invention includes a platen 2 around which a printing medium (paper) 1 is wound, a carrier unit 3 that moves in parallel along this platen 2 and prints on the printing paper 1, and a carrier unit 3 that prints on the printing paper 1. It includes a tractor unit 4 to be attached. Platen 2
is driven by a pulse motor 5, and this driving force is transmitted from a motor gear 6 directly connected to the pulse motor 5 to a platen gear 8 via an idle gear 7, and then to a platen 2 directly connected to the platen gear 8. In addition, this platen 2 has knob 15.
It can be rotated manually.

The tractor unit 4 is driven as the platen 2 rotates, and this driving force is transmitted from a platen gear 9 directly connected to the platen 2 to a tractor gear 11 via an idle gear 10. The tractor unit 4 is configured to feed the paper by a predetermined amount using a tractor pin 50.

The carrier unit 3 is equipped with a type head 12, a split type print head 13, a ribbon cassette 14, and the like. This carrier unit 3 is provided with a guide bearing 16, and is mounted on a guide shaft 17 via this guide bearing 16. The carrier unit 3 is moved along the platen 2 by a spacing motor 18, and the driving force of the spacing motor 18 is transmitted through two wire ropes 19a and 19b. The wire ropes 19a, 19b are attached to a drive pulley 20 whose one end is directly connected to the spacing motor 18, and after being wound around the drive pulley 20 multiple times, the wire ropes 19a, 19b are attached to guide pulleys 21a, 22a, 21b, 22b attached to the frame. via guide pulleys 23a, 23b attached to the carrier unit 3, and further via guide pulleys 24a, 24b attached to the frame.
The other end is connected to the carrier unit 3.

The carrier unit 3 has various mechanisms mounted on a front casting 25. Although not shown in the drawings, the front casting 25 is provided with a rotating motor for rotating the petal type type head 12 and a transducer for selecting type at the bottom of the rotating motor. Further, this front casting 25 is provided with a perpendicular motor for moving the petal type type head 12 up and down.

A card holder 43 is provided on the front casting 25, and this card holder 43 serves to hold down the paper 1 so that it does not run out of alignment with the platen 2.

Further, the front casting 25 is provided with a ribbon base (not shown), on which the ribbon cassette 14 is removably mounted.

As shown in FIG. 3, the petal type type head 12 is composed of a large number of fingers 46, and each finger 46 is provided with type characters 49 in two upper and lower stages. The petal type type head 12 is provided with a hole 48 in the lower center and is configured to be replaceable.

The print head 13 is located at a position surrounded by the fingers 46 of the type wheel 12, and is located at a position where striking force can be obtained from the back surface of the type 49.

FIG. 4 shows the construction of a split print head 13 used in one embodiment of the present invention. In Figure 4,
The print head of this embodiment has a structure similar to a dot head used in a so-called dot matrix printer, and when the electromagnetic magnet 51 is excited, the armature 52 is attracted and the armature 5 is
The wire 53 in contact with the type head 2 is configured to pop out and apply an impact force to the type head 12, and after printing is completed, the wire reset spring 5
4 and an armature reset spring 55 to return to the original state.

Although only two pairs of magnets, armatures, and wires are shown as movable parts in this print head in FIG. 4, in reality, a plurality of magnets are arranged, and each wire passes through a wire guide 57. The tips are arranged in a matrix (as shown in FIG. 5).

As an example of a printing head, a dot matrix-shaped printing head with a total of 35 hammer tips, 5 vertical rows and 7 horizontal rows, as shown in Figure 5a, will be explained. When printing "8", as shown in FIG. 5b, dot matrix wires 53a-2 to 53a-4, 5
3b-1, 53b-5, 53c-1, 53c-
5,53d-2 to 53d-4,53e-1,53
e-5, 53f-1, 53f-5, 53g-2~
53g-4 (The part where the tip of the wire is marked will be excited, and only the part corresponding to the printed text will be struck from the back.

In addition, when the print head in the form of a dot matrix prints the print characters "" (quotation marks), the wire tips 53a-2, 53b-
2, 53b-4, 53c-2, 53c-4 are written, and only the parts corresponding to the printed characters are struck from the back.

The printed characters on the type head 12 thus struck are pressed against the platen 2 via the ink ribbon 38 and the paper 1, thereby transferring the ink to the paper in the shape of the printed characters.

In this way, the printing heads arranged vertically in a single line do not cause the ghost printing shown in Figure 1b, and in the case of matrix-shaped printing heads, the above-mentioned conventional method can print characters that are uneven vertically and horizontally. Printing can be done without any defects.

Next, referring to FIG. 6 regarding the drive hammer selection circuit that drives the wire of the print head, this drive hammer selection circuit inputs the print code from the control section (not shown) and inputs the print code from the drive wire 5 of the print hammer 13.
a character table 71 that can send out a plurality of outputs corresponding to the number 3; an AND gate group 73 that sends out the outputs of the character table 71; a pulse generation circuit 72 that controls the AND gates with a hammer strobe signal; It includes a drive circuit 74 which is activated by signals from the AND gates and drives the electromagnetic magnet of the print head.

The character table 71 is set according to the type of printed character.
This is for selecting the print head wire when striking the print head 12. For example, in a print head in which the wire tips of the print head are arranged in a vertical line (for example, 7 wires), the character table 7
Seven signals 71a, 71b,
...It is only necessary that an output terminal for sending out 71g is provided. In addition, if there is a dot matrix printing head, a large number of output signals 71a-
1-71a-5, 71b-1-71b-5, 71
c-1~71c-5...71g-1~71g-5
An output terminal is provided for sending out.

Next, the operation of the embodiment of the present invention will be explained with reference to FIG. When a printing command is first input to the printing device, the printing device performs a character selection operation based on a command from a control section (not shown). That is, the type head is positioned in the rotational direction by a rotary motor, and shifted in the vertical direction by a vertical motor. Once the type is in the selected position, the print head 13 is energized. In the dot matrix type print head 13, for the print code "8", the wire (marked with ●) shown in FIG. ) are driven so that only the signals 71a-2 to 71a-4, 71b are driven.
-1,71b-5,71c-1,71c-5,7
1d-2 to 71d-4, 71e-1, 71b-
5,71f-5,71g-2 to 71g-4 are generated. These signals 71a to 71g are supplied to an AND gate group 73, and based on a strobe pulse 72a from a pulse generation circuit 72, a drive circuit group 74 is supplied.
is supplied to In the drive circuit group 74, individual drive circuits 74a to 74g are selectively operated to excite the electromagnet group 51. As a result, the wires 53 are wires 53a-2 to 53a-4, 53 marked with ●.
b-1, 53b-5, 53c-1, 53c-5,
53d-2 to 53d-4, 53e-1, 53e-
5,53f-1,53f-5,53g-2~53
g-4 is activated and strikes a portion of the type head 12 corresponding to the shape of the type from the back side.

Similarly, for the print code "" (quotation mark), a signal 71a- is sent to the output terminal from the character table 71.
2,71a-4,71b-2,71b-4,71
c-2, 71c-4, and as a result, the wires 53a-2, 53a-4, 53b- of the print head 13
2, 53b-4, 53c-2, and 53c-4 are driven to strike a portion of the type head 12 corresponding to the shape of the type from the back side.

The type on the type head 12 that has been hit in this way is transferred to the platen 2 via the ink ribbon 38 and the paper 1.
The ink is transferred to the paper in the shape of the type.

Although one embodiment of the present invention has been described above, it is clear that various changes can be made to the embodiment without departing from the gist of the present invention. For example, in the embodiment described above, the type head is a so-called cup-shaped type head, but the type head may also be shaped like a so-called daisy wheel. That is, the type head 62 is
As shown in the figure, letters are arranged at the tips of a plurality of fingers 46 extending radially from the center. Although not shown, the printing hammer 13 is made up of wires arranged in a vertical line or in a matrix as described above, and is located on the opposite side of the printing head 62 from the printing characters. It is clear that even with such a configuration, the same operation as in the cup-shaped type embodiment can be performed.

Furthermore, although the present invention has been described in the embodiments in which the print head has seven movable parts and in which the print head has 35 movable parts, such effects can be obtained if the print head has at least two or more movable parts.

As explained above, the present invention uses a mechanism in which printing is performed by receiving an impact on the side of the type head opposite to the type, in which the movable part is divided and a divided hammer that moves independently is used to correspond to the type to be printed. By driving only the movable parts, the life of type can be extended and ghost printing can be avoided.

[Brief explanation of drawings]

1A and 1B are views showing the main parts of a conventional printing mechanism, FIG. 2 is a perspective view showing an embodiment of the present invention, and FIG. 3 is a view showing main parts in an embodiment of the present invention. FIG. 4 is a diagram showing a printing hammer used in an embodiment of the present invention, FIG. 5a is a front view showing the tip of the printing hammer used in an embodiment of the invention, and FIG.
Figures b and c are diagrams showing the operating states of other printing hammers in Figure 5a, Figure 6 is a diagram showing a drive hammer selection circuit used in the present invention, and Figure 7 is a diagram showing another embodiment of the present invention. FIG. 1... Print medium, 2... Platen, 3... Carrier unit, 4... Tractor unit, 5...
Pulse motor, 6... Motor gear, 7, 10...
Idle gear, 8, 9...Platen gear, 11...
...Tractor gear, 12... Type head, 13...
Printing hammer, 14... Ribbon cassette, 15...
Knob, 16a-16e...Guide bearing,
17... Guide shaft, 18... Spacing motor, 19a, 19b... Wire rope, 20
... Drive pulley, 21a, 21b, 22a,
22b, 23a, 23b, 24a, 24b...Guide pulley, 25...Front caster,
43...Card holder, 46...Finger, 49
...Print, 50...Tractor pin, 51...Electromagnetic magnet, 52...Armature, 53...Wire, 54...Wire reset spring, 55
... Armature reset spring, 56...
Back stopper, 57... Wire guide, 58...
... Wire guide, 59 ... Hammer (single body), 6
1...Selection motor, 62...Print head (daisy-shaped), 71...Character table, 72...
Pulse generation circuit, 73...AND gate group, 73
a to 73g...AND gate, 74...drive circuit group, 74a to 74g...drive circuit.

Claims (1)

[Claims] 1. In a printing device in which a printing part carrier performs reciprocating motion along a platen, a printing type provided on the printing part carrier and having a printing part on a surface facing the platen and being hit by a back surface of the printing part. a dot head section which is provided on the back side of the type head and has a plurality of wires arranged in a dot matrix pattern and is capable of performing dot matrix type printing; means for selecting a wire corresponding to a dot pattern of type to be printed;
A printing device characterized in that printing is performed by striking the back side of the type to be printed with the selected wire.