JP2777029B2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer having a gap enlarging function and a sheet conveying function.

[0002]

2. Description of the Related Art In a printer that drives a print head and prints on a sheet guided on a print surface, a print head and a print surface or a paper surface are disposed in order to improve printing accuracy and reduce the capacity of the print head. It is important to set the gap to an appropriate value, and this gap is very small.

[0003] Therefore, when the applied paper is thick or the thickness varies, a large frictional resistance load is generated when the paper is conveyed during the printing operation. Further, the paper may be inclined due to the variation in the frictional resistance in the width direction. Further, in the case of bound sheets, passbooks, and the like, the level difference is large, so that the sheet conveyance itself may be difficult.

[0004] Thus, conventionally, in order to make the gap as small as possible, it is configured to execute the gap enlarging function prior to executing the sheet conveying function.
This gap enlargement function is, for example, to move a guide shaft of a carrier on which a print head is mounted by driving a solenoid to enlarge the gap as compared with a normal case.
Therefore, any paper can be smoothly transported, and the paper transport motor can be downsized.

[0005]

However, there are cases where it is desired to print only one sample to check its layout or to obtain only a certain page immediately. However, in the conventional structure, even when the line feeds, it is necessary to execute the sheet conveying function after executing the gap enlarging function. A similar problem can also occur when very thin paper is used with diversification.

An object of the present invention is to provide a printer capable of forcibly performing high-speed printing as required.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to satisfy a practical demand for printing at a high speed anyway because a slight inclination of a sheet may sometimes occur in a printing mode. Under such conditions, the gap enlarging function is forcibly prohibited, and printing can be performed while forcing the sheet conveying function.

That is, the printer according to the present invention has a gap enlarging function and a sheet conveying function, and conveys a sheet under the condition that the gap between the printing surface or the sheet surface and the printing head is enlarged, and reduces the gap. In a printer formed to perform a printing operation after returning to the original state, the forced high-speed feed mode selecting means and the execution of the gap enlarging function on condition that the forced high-speed feed mode is selected and that there is a paper transport request. And a paper forced conveyance control means for forcibly executing the paper conveyance function while the gap expansion function is forcibly prohibited. Features.

[0009]

In the present invention having the above structure, when the forced high-speed feed mode is selected by the forced high-speed feed mode selecting means,
When there is a paper transport request, the gap expansion forcing prohibition control means operates to forcibly prohibit the execution of the gap expansion function. Then, the paper forced transport control means forcibly executes the paper transport function. Therefore, the paper can be forcibly fed while the execution of the gap enlargement function is exceptionally omitted, so that high-speed printing can be performed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 5, the basic structure of this printer is a dot printer, and a forced high-speed feed mode selecting means (21) and a gap enlarging forced prohibition control means (11,
12) and paper forced transport control means (11, 12) are provided so that high-speed printing can be arbitrarily and arbitrarily performed.

In FIGS. 2 to 5, reference numeral 1 denotes a frame which also forms a printing surface 1P, and a carrier guide shaft 41 and a roller shaft 51 are bridged over the side walls 1S, 1S. The print head 30H is mounted on a carrier 45, and is moved along the gall guide shaft 41 by carrier driving means including a carrier motor 40M, sprockets 42, 42, a timing belt 43, a carrier driving circuit 40, and the like shown in FIGS. To reciprocate left and right. The roller shaft 51 is connected to the paper feed motor 50.
The paper P can be transported in a predetermined direction by being rotated by M.

Here, as shown in FIG. 4, the gap enlarging mechanism includes a carrier guide shaft 41 mounted in the vertical groove 1H of the side wall surface 1S so as to be movable up and down.
5 (elevation bar 56) is driven (ON) and moved up and down to execute the gap enlarging function. Therefore, when the solenoid 55 is turned off, the abutment plates 46, 46 shown in FIG.
Can be set to an appropriate value, and the gap G can be enlarged by turning on the solenoid 55 and moving the carrier guide shaft 41 away from the paper P (moving it upward in FIG. 5).

As shown in FIG. 1, the control unit 10
It includes a PU 11, a ROM 12, a RAM 13, a data transmission interface 14 with a host computer, an input / output port 15, and an operation panel 20. The input / output port 15 includes a print head drive circuit 30, a carrier drive circuit 40 (carrier motor 40M). ), The paper feed circuit 50 and the solenoid 55 are connected.

Here, the gap enlargement function is performed by the CPU 1
1 (steps ST15 and ST18 in FIG. 6), and the paper transport function
This is executed by the sheet transport control means (11, 12) (ST10, 16, 17). That is, when there is a paper transport request (YES in ST10), the gap expanding function is executed to expand the gap G (ST15). After this enlargement, the paper transport function is executed, and the paper is transported by a predetermined amount (ST16, 17). By turning off the solenoid 55 after the conveyance is completed, the gap G is returned to the original (ST1).
8).

Here, the forced high-speed feed mode selection means declares that the high-speed feed is arbitrarily and arbitrarily forced as required. The operation panel 20 shown in FIG.
It is formed from a selection key 21 provided above. That is,
When the selection key 21 is pressed (YES in ST11),
The forced high-speed feed mode is selected and stored in the work area of the RAM 13.

Next, the gap expansion forced prohibition control means includes:
The forced high-speed feed mode is selected (YE in ST11).
S) and there is a paper transport request (YE in ST10).
S) is a means for forcibly prohibiting the execution of the gap enlarging function, that is, the driving (ON) of the solenoid 55, on the condition that
It is composed of a CPU 11 and a ROM 12, and is executed in ST12.

The forcible sheet transport control means forcibly executes the sheet transport function while the execution of the gap enlarging function is forcibly prohibited.
12 and are executed in ST13 and ST14.

In the embodiment having such a configuration, normally, when there is a paper transport request (YES in ST10), the gap enlargement control means (11, 12) operates. That is, the solenoid 55
Is turned on, the print head 30H and the carrier 45 are separated from the sheet P to enlarge the gap G (ST15). Then, the paper transport control means (11, 12) operates to transport the paper P by a predetermined amount in a predetermined direction (ST16). When the transfer is completed (YES in ST17), the solenoid 55 is turned off.
F, and the gap G is returned to an appropriate value (ST18).
That is, printing is performed while executing the gap enlarging function and the sheet conveying function as a pair.

Here, if the selection key 21 is pressed down,
If there is a paper conveyance request (YES in ST10), the gap expansion forced prohibiting means (11, 12) operates to operate the solenoid 5
5 is stopped (ON). That is, the gap expansion is forcibly prohibited (ST12). When the forcible prohibition is performed, the paper forcible conveyance control means (11, 12) forcibly rotates the paper conveyance motor 50M to convey the paper even when the gap G is kept at a small appropriate value (ST13, ST1).
4). Therefore, even if the paper transport load increases or the paper is slightly tilted, the solenoid 55
High-speed printing can be performed by the time reduction in which N-OFF is omitted.

Thus, according to this embodiment, the forced high-speed feed mode selection means (21), the gap expansion forced inhibition control means (11, 12), and the paper forced transport control means (11,
12), the gap enlarging function is forcibly prohibited and the sheet is conveyed irrespective of the sheet thickness and the appropriate value of the gap G, provided that the sheet conveyance request and the forced high-speed feed mode are selected. It is configured to force
Extremely high-speed printing can be performed when only one sheet is arbitrarily printed or when extremely thin paper is used, and the usability can be expanded.

Further, since the forced high-speed feed mode selecting means is formed by the selection key 21 and need only be pressed down, the handling is extremely simple.

[0022]

According to the present invention, there is provided a forced high-speed feed mode selecting means, a gap enlarging forbidden control means, and a sheet forced transport control means, and the sheet thickness is set on condition that the forced high-speed feed mode is selected. Since the gap enlargement function is forcibly prohibited and paper conveyance is forced regardless of the appropriate value of the gap, when printing only one sheet arbitrarily or when printing on thin paper In such cases, extremely high-speed printing can be executed, and the usability is expanded.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a control unit according to an embodiment of the present invention.

FIG. 2 is a front view showing a mechanical configuration.

FIG. 3 is also a plan view.

FIG. 4 is also a side view.

FIG. 5 is also a diagram for explaining a gap G;

FIG. 6 is a flowchart for explaining the operation.

[Explanation of symbols]

Reference Signs List 1 frame 1H vertical groove 1P printing surface 1S side wall surface 10 control unit 11 CPU (gap expansion forced prohibition control means, paper forced conveyance control means) 12 ROM (gap expansion forced prohibition control means, paper forced conveyance control means) 13 RAM 20 operation Panel 21 Selection key (forced high speed mode selection means) 30 Print head drive circuit 30H Print head 40 Carrier drive circuit 40M Carrier motor 41 Carrier guide shaft 45 Carrier 46 Butting plate 50 Paper feed drive circuit 50M Paper feed motor 51 Roller shaft 52 Roller 55 Solenoid 56 Lift bar G Gap

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Chishiro Kosaka 570, Oni-cho, Oni-cho, Tagata-gun, Shizuoka Prefecture Tokyo Electric Co., Ltd. (56) References JP-A-2-277679 (JP, A) JP-A-2-103170 (JP, A) JP-A-2-30576 (JP, A) JP-A-1-146964 (JP) , U) (58) Field surveyed (Int.Cl. ⁶ , DB name) B41J 25/304-25/308 B41J 11/14

Claims (1)

(57) [Claims] The present invention has a gap enlarging function and a sheet conveying function, and performs a sheet conveying operation on the condition that a gap between a printing surface or a sheet surface and a printing head is enlarged, and returns a gap to an original state to perform a printing operation. A forced high-speed feed mode selecting means, and a gap for forcibly prohibiting the execution of the gap enlarging function on condition that the forced high-speed feed mode is selected and that there is a sheet conveyance request. A printer comprising: a forced enlargement prohibition control means; and a paper forced conveyance control means for forcibly executing the paper conveyance function while the gap expansion function is forcibly prohibited.