JPH07101119A - Printer - Google Patents

Abstract

PURPOSE:To prevent occurrence of a curl, etc., by waiting an end of a sheet at a cutter at the time of non-printing, and automatically retreating the sheet up to a home position of printing in the case of starting the printing. CONSTITUTION:Before printing, a sheet in a standly state that an end of a residual sheet is placed at a position of a guide 31 immediately before a cutting edge of a cutter in a state cut at a previous time. In the case of starting printing, a print controller drives a stepping motor in response to a stored program, and drives to retreat the sheet S to the home position for printing. When the printing is started from this state and one page is printed, the sheet is driven forward, and when a trailing end of the printed sheet coincides with a cut position, feeding of the sheet is stopped, and cut for one page. At this stage, each printing is judged by the program, and when next page is subsequently printed, the sheet is retreated to the home position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer, and more particularly to a paper processing control mechanism.

[0002]

2. Description of the Related Art In a printer equipped with a paper cutting cutter, the paper is normally fed forward every time one page is printed, and the feeding is stopped when the end of the printed one page reaches the cutting position. The cutter is operated, the paper is then retracted until the leading edge of the remaining paper reaches the printing position, and the paper is made to stand by in preparation for the next printing. This standby position (see FIG. 3B) is the home position,
It is treated as the origin of the paper position.

However, if the sheet is left at this standby position for a long time, the leading edge of the sheet hangs down in the direction of inclination of the platen roll (broken line in FIG. 3B) and curls to cause a sheet jam. Therefore, various problems have occurred.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a printer capable of stably driving a sheet.

[0005]

SUMMARY OF THE INVENTION According to the present invention, in a printer having a cutter unit in front of a printing unit, when the printing process is not performed, the leading end of the paper is made to stand by in the cutter unit, and when the printing is started, the printing is performed. The printer is provided with a paper drive control means for automatically retracting the paper to the home position.

[0006]

According to the present invention, in a printer provided with a cutter unit in front of the printing unit, when the printing process is not performed, the leading end of the paper is made to stand by at the cutter unit (FIG. 3A), and when the printing is started, When the printer is equipped with a paper drive control unit that automatically retracts the paper to the home position for printing, the tip of the paper is cut by a cutter and is held on the paper guide when not printing. Therefore, even if a long time has passed, there is no possibility that the leading edge of the paper hangs and curls.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration example diagram of an embodiment of a printer of the present invention, and FIG. 2 is a mechanical configuration example diagram thereof. In FIG. 1, (B) is a bus line, (1) is a CPU, (2) is a control program storage section, (3) is a print control section, and (4) is a thermal head for printing and recording,
(5) is a stepping motor for driving the recording sheet, (6) is a cutter for cutting the sheet at a required position, and (7) is a communication interface for exchanging information with the outside of the apparatus. is there.

In the control program storage section (2), in addition to basic programs such as a data editing program and a printing control program as a printer, a program for controlling the operation of the cutter in relation to the printing operation and the sheet feeding operation, etc. Is stored, and based on this, the CPU (1) controls the thermal head (4), the stepping motor (5), and the cutter (6).

FIG. 2 is a mechanical structural example of the apparatus shown in FIG. 1, and (S) is a printing sheet such as paper, tack paper or the like (hereinafter simply referred to as a sheet). (8) is a sheet feed roller, (9) is a pressure contact roller, and (10) is a platen roll that feeds the printing sheet (S) while pressing it against the print head (4). It should be noted that in the figure, although it is written as if it is falling slightly, the upper end surface of the platen roll is actually positioned at the horizontal running line of the paper. (11) is a seat drive belt, (12) is a platen drive belt, (13),
(14), (15) and (16) are belt wheels.

The cutter (6) is provided at the rear stage of the print head (4), and includes, for example, a fixed blade (17) and a vertically movable blade (1).
8), eccentric cam (1) for moving the moving blade (18) up and down
9) and a cutter motor (20). As the movable blade (18), a rotary type (rotary blade) may be used instead of the vertical movement type. (21) is a cutter blade (1
It is a paper guide mechanism provided immediately before 7) and (18).

Next, the operation of the present invention will be described with reference to the program configuration diagram of FIG. a) Before printing, the paper is in the state of being cut last time,
That is, the leading edge of the remaining paper is on standby at the position of the guide (21) immediately before the blade of the cutter section. b) At the start of printing, the print control unit (3) drives the stepping motor (5) according to the program stored in (2), and the paper is driven backward to the home position for printing operation. .

C) When printing is started in this state and printing for one page is performed, when the paper is driven forward and the trailing edge of the printed page coincides with the cutting position, paper feeding is stopped,
One page is cut. d) At this stage, the program makes a judgment for each print, and if the next page is printed continuously, the paper is retracted to the home position, and once the print is completed, the backward drive is not performed, The last printed page is held in the cut state.

[0013]

As described above, according to the present invention, the paper is placed in the home position for printing from the start to the end of printing, but the tip of the paper is held by the cutter section in principle during other periods. Therefore, there is no possibility that the leading edge of the paper hangs down and curls or the like occurs.

[Brief description of drawings]

FIG. 1 is a schematic system configuration diagram of a printer of the present invention.

2 is a schematic diagram of the mechanical configuration of the apparatus of FIG.

3 is a detailed view of a positional relationship between a printing unit and a cutter unit of the apparatus of FIG.

[Explanation of symbols]

 1 CPU 2 Control Program Storage Section 3 Printing Control Section 4 Thermal Head 5 Stepping Motor 6 Cutter 7 Communication Interface 8 Sheet Feed Roller 9 Pressing Roller 10 Platen Roll 11 Sheet Drive Belt 12 Platen Drive Belt 13 Belt Car 14 Belt Car 15 Belt Car 16 Belt wheel 17 Fixed blade 18 Moving blade 19 Eccentric cam 20 Cutter motor

Claims (1)

[Claims] 1. A printer having a cutter unit in front of the printing unit, when the printing process is not performed, the leading end of the paper is made to stand by in the cutter unit, and when the printing is started, the paper is automatically moved to the printing home position. A printer comprising a sheet drive control means for retracting the sheet.