JP2000233540A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make uniform abrasion of a spacing shaft during an aging test. SOLUTION: A print head 1 is reciprocated while shifting the start position by a specified distance α (α=0.21 mm) at a time from a left limit position Lmax toward a right limit position Rmax wherein S=Smax/2 (Smax: maximum spacing distance). When the print head 1 reaches the Rmax by repeating the reciprocal operation, the stop position is reset to return the print head 1 from the Rmax to the Lmax before resuming reciprocal operation from the Lmax to the Rmax. The operation is repeated for several tens of hour.

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 print head that moves with a spacing shaft as a guide shaft.

[0002]

2. Description of the Related Art Conventionally, in this type of printer,
Generally, an aging test is performed for several tens of hours before being shipped as a product. That is, as shown in FIG.
The print head 1 is reciprocated between a movement limit position (left end limit position) Lmax of the spacing shaft 2 in the left direction and a movement limit position (right end limit position) Rmax in the right direction. Is repeated for several tens of hours.

In FIG. 4A, a print head 1 is shown.
Is regarded as the position of the print head 1, the leftward movement limit of the printhead 1 position is defined as a left end limit position Lmax, and the rightward movement limit is defined as a right end limit position Rmax. That is, the printer head 1 repeats reciprocating movement with the distance Smax from Lmax to Rmax as a movement distance (spacing distance). The movement range is the printer head 1 when the position of the printer head 1 reaches the left end limit position Lmax. Between the left side position LLmax and the right side position RRmax of the printer head 1 when the right end limit position Lmax is reached.

[0004]

However, according to such a conventional aging method, since the start position and the stop position of the print head 1 during the reciprocating movement are constant, the spacing shaft for guiding the print head 1 is used. The wear of No. 2 is not uniform.

That is, the print head 1 is started from the left end limit position Lmax to the right end limit position Rmax, and stopped when the print head 1 reaches the right end limit position Rmax. Then, it is started from the right end limit position Rmax toward the left end limit position Lmax, stopped when reaching the left end limit position Lmax, and started again toward the right end limit position Rmax.

In this case, the start / stop of the print head 1 is repeated at the left end limit position Lmax and the right end limit position Rmax. Therefore, as shown in FIG. 2
Only the left and right ends are slightly worn. For this reason, the wear of the spacing shaft 2 is not uniform, not only lowering the printing accuracy but also shortening the life of the printer device.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a printer device which can make the spacing shaft wear uniform during an aging test. is there.

[0008]

In order to achieve such an object, a first invention (an invention according to claim 1) is to move a print head from a movement limit position on one end side of a guide shaft to the other end. Reciprocating means for reciprocating the start position by a predetermined distance toward the side movement limit position. According to this invention, the print head moves from one end (left end / right end) side movement limit position to the other end (right end / left end) side movement limit position of the guide shaft.
It reciprocates while moving from the start position by a predetermined distance.

A second invention (an invention according to claim 2) is to move the print head by a predetermined distance from the movement limit position at one end of the guide shaft to the movement limit position at the other end of the guide shaft. A reciprocating means for reciprocating the carriage, and return means for returning the print head to the movement limit position on one end when the print head reaches the movement limit position on the other end. is there. According to the present invention, the start position of the print head is shifted by a predetermined distance from the movement limit position on one end (left end / right end) of the guide shaft to the movement limit position on the other end (right end / left end). When the print head reaches the movement limit position at the other end, it returns to the movement limit position at one end.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a diagram for explaining the principle of the present invention. 4, the same reference numerals as those in FIG. 4 denote the same or equivalent components, and a description thereof will be omitted.

[Reciprocation from Lmax to Rmax] In this embodiment, the print head 1 is moved to the left end limit position Lm.
The start position is moved by a predetermined distance (small distance) α from ax toward the right end limit position Rmax, and is reciprocated.

That is, as shown in FIG. 1A, first, the print head 1 is moved from the left end limit position Lmax toward the right end limit position Rmax by a predetermined distance (movement distance) S and then stopped. Here, S is from Lmax to Rm
ax (maximum spacing distance) Smax to 1
/ 2 (S = Smax / 2).

The stop position is set as the return position, the print head 1 is moved by S-α toward the left end limit position Lmax and stopped, and the reciprocating operation described above is repeated with the stop position as a new start position. Here, α is set to α = 1/120 inch = 0.21 mm.

[Return from Rmax to Lmax] When the print head 1 reaches the right end limit position Rmax by repeating this reciprocating operation (see FIG. 1B), the stop position is reset there, and the print head 1 is moved to the right end. Returning from the limit position Rmax to the left end limit position Lmax, the aforementioned L
The reciprocating movement from max to Rmax is restarted. This operation is repeated for several tens of hours.

That is, in the present embodiment, the print head 1 is reciprocated by moving the start position from the left end limit position Lmax of the spacing shaft 2 toward the right end limit position Rmax by a small distance α. The start position / stop position of the print head 1 during the movement is shifted by a minute distance α, and the entire spacing shaft 2 is slightly worn in the movement range of the print head 1, and FIG. As shown in ()), the wear of the spacing shaft 2 becomes uniform.

FIG. 2 is a flowchart for realizing the above operation. FIG. 3 is a block diagram showing a main part of a printer device that executes a processing operation according to this flowchart.

In FIG. 3, 3 is a master CPU, 4 is a slave CPU, 5 is a memory attached to the master CPU,
6 is a common memory provided between the master CPU 3 and the slave CPU 4, 7 is a memory attached to the slave CPU 7, 8 is a spacing motor that moves the print head 1 using the spacing shaft 2 as a guide shaft, and 9 is a space motor. Detects the number of rotations of pacing motor 8 and sets the slave CPU
A rotation speed input unit 4 is provided with a servo control circuit 10 for controlling the rotation speed of the spacing motor 8 in response to a command from the slave CPU 4, and a detection unit 11 detects the movement position of the print head 1 from the rotation amount of the spacing motor 8. And a sensor input unit to be provided to the slave CPU 4.

The processing operation according to the flowchart shown in FIG. 2 is performed by a slave CPU (hereinafter simply referred to as CPU) 4. That is, when the start of aging is instructed, the CPU 4 sets the left end limit position Lmax as the head start position (step 201), and sets the head start position + (Sma
x / 2) is set as the head stop position (step 202), the print head 1 is moved to the head start position, and rightward spacing (movement of the print head 1 toward the right end limit position Rmax) is executed. (Step 203).

When the print head 1 reaches the head stop position due to the rightward spacing (YES in step 204), it is checked whether the head stop position is at the right end limit position Rmax (step 205). In this case, since the right end limit position Rmax has not been reached, the process proceeds to step 206 in accordance with NO in step 205, and a minute distance α is added to the head start position to obtain a new head start position.

Then, the new head start position is set as the head stop position (step 208), and spacing in the left direction (movement of the print head 1 toward the left end limit position Lmax) is executed (step 209). When the print head 1 reaches the head stop position by the leftward spacing (YE in step 210).
S), that is, when the head reaches the new head start position, the process returns to step 202, where the head start position + (S
(max / 2) is set as the head stop position, and rightward spacing is executed (step 203).

In step 205, if it is confirmed that the head stop position has reached the right end limit position Rmax, the left end limit position Lmax is set as the head start position (step 207), and this head start position is set as the head stop position (step 207). (Step 208), a spacing in the left direction is executed (Step 209).

When the print head 1 reaches the head stop position by the spacing in the left direction, that is, when the print head 1 reaches the left end limit position Lmax, the process returns to step 202 in response to YES in step 210, and the head start position + (Smax) / 2) is the head stop position, and the subsequent operations are repeated.

In the above-described embodiment, the print head 1 is reciprocated while moving the start position from the left end limit position Lmax toward the right end limit position Rmax by a small distance α. R
The print head 1 is moved from the maximum position to the left end limit position Lmax by moving the start position by a small distance α.
May be reciprocated.

Further, if the print head 1 is reciprocated while moving its start position from the left end limit position Lmax to the right end limit position Rmax by a small distance α, whereby the print head 1 reaches the right end limit position Rmax. Alternatively, the operation of moving the start position toward the left end limit position Lmax by a small distance α and then reciprocating may be repeated.

In the above-described embodiment, the forward distance when the print head 1 reciprocates is represented by S = Smax.
/ 2, but S = Smax / 3, S = Smax / 4, etc.

[0026]

As apparent from the above description, according to the present invention, the print head is moved from one end of the guide shaft to the other end of the guide shaft.
Since the start position is moved by a predetermined distance and then reciprocated, the entire spacing shaft is slightly worn in the print head movement range, and the spacing shaft is worn out during the aging test. Can be made uniform.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a flowchart for realizing an operation according to this principle.

FIG. 3 is a block diagram illustrating a main part of a printer that executes a processing operation according to the flowchart.

FIG. 4 is a diagram illustrating movement of a print head during a conventional aging test.

[Explanation of symbols]

1 ... print head, 2 ... spacing shaft, 3 ...
Master CPU, 4 ... Slave CPU, 5 ... Memory, 6 ...
Common memory, 7: memory, 8: spacing motor, 9
... Rotation number input unit, 10 ... Servo control circuit, 11 ... Sensor input unit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Genichi Takahashi 2-3-2 Shimomeguro, Meguro-ku, Tokyo Inside Tamura Electric Works, Ltd. (72) Inventor Kento Suzuki 2-chome, Shimomeguro, Meguro-ku, Tokyo No. 3 Inside Tamura Electric Works (72) Inventor Mikio Nagai 5-7-1 Shiba, Minato-ku, Tokyo Within NEC Corporation (72) Keiichi Aoki 3-49, Kamiishihara, Chofu-shi, Tokyo No. 1 Nippon Electric Data Equipment Co., Ltd. F-term (reference) 2C480 CA01 CA09 CA16 CA52 DB02 DB08 EB04 EB14

Claims (2)

[Claims] 1. A printer device comprising a print head that moves using a spacing shaft as a guide shaft, wherein the print head is moved from a movement limit position at one end of the guide shaft to a movement limit position at the other end. And a reciprocating means for reciprocating the start position by a predetermined distance. 2. A printer apparatus comprising a print head that moves with a spacing shaft as a guide shaft, wherein the print head is moved from a movement limit position at one end of the guide shaft to a movement limit position at the other end. A reciprocating means for reciprocating the start position by a predetermined distance, and, when the print head reaches a movement limit position on the other end, the print head is moved to the movement limit position on the one end. And a return means for returning to the original state.