JPH10138596A - Carriage driving device for printer and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a carriage driving device for a printer capable of effectively being assembled, by a method wherein correction of a shift of a printing position in a scanning direction is completed in a predetermined quantity, so that adjusting means and adjusting processes after the assembling can be eliminated and combination of an output torque and a load torque is always periodically reproduced in terms of the carriage driving device for the printer such as an ink jet printer that carries out the reciprocation movement of a carriage. SOLUTION: In an assembling method of a carriage driving device for a printer, a stepping motor 1 is assembled by maintaining a relationship between a magnetizing phase angle and a phase angle of teeth of a timing pulley 2 at a constant condition. In the carriage driving device for the printer, an angle pitch of stepping of the stepping motor 1 is an integer multiple of an angle pitch of the teeth of the timing pulley 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stepping motor for driving, a timing pulley fixed to the stepping motor, and a reciprocating drive of the carriage between the timing pulley and the carriage 5, as shown in FIG. For example, the present invention relates to a carriage driving device for a reciprocating printing device, such as an ink jet printer, having a timing belt 4 stretched to perform the assembling method and the driving device.

[0002]

2. Description of the Related Art Printing having a stepping motor for driving, a timing pulley fixed to the stepping motor, and a timing belt stretched between the timing pulley and the carriage to reciprocate the carriage. 2. Description of the Related Art In a reciprocating carriage driving device such as an apparatus, when performing reciprocal printing, a print shift has occurred in a scanning direction of the carriage. This is because the carriage has a hysteresis in the addressing in the forward and backward paths by adopting the open loop control by the stepping motor for driving the carriage, and the motor has a delay in the advance angle with respect to the drive pulse. Is attributed to The motor drive pulse means that the absolute position of the carriage is changed, and the count value of the motor drive pulse indicates information on the absolute position. Since the carriage has a delay with respect to the pulse count up / down, the carriage shifts from the absolute position indicated by the count value to a position opposite to the traveling direction when the drive pulse is output. Will be offset in the opposite direction across the target position corresponding to.

[0003] By correcting the delay as a delay time from the output of the drive pulse to the output of the print pulse, it is possible to eliminate the print shift.

The amount of advance delay of a stepping motor largely depends on the magnitude relationship between the output and load of the motor, that is, the torque margin obtained during driving, in addition to the time constant determined by the specifications of the motor.

[0005] The output of a stepping motor has a torque increase or decrease based on the step angle, while a timing pulley,
The timing belt will have a load variation based on the belt pitch. As shown in FIG. 8, if the assembly is performed without considering the relationship between the excitation phase angle of the stepping motor 1 and the phase angle of the teeth of the timing pulley 2, the above relationship in a finished product will vary from product to product. In addition, the overlap between the output fluctuation and the load fluctuation becomes random, causing a difference in the average value of the torque margin. As a result, the advance delay amount becomes random for each printing apparatus. To solve this, conventionally, for example, after assembling as disclosed in Japanese Patent Application Laid-Open No. Hei 5-305734, individual adjustment by software adjustment or hardware assembling adjustment according to print quality, or individual adjustment after printing is performed. Adjustments were being made.

However, in the case of using the adjusting means after the assembling, measuring means and adjusting means for the printing quality after the assembling, an adjusting step, and a step of confirming the printing quality after the adjusting are necessary. I needed it.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a printing apparatus to be assembled is designed so that all printing misalignment characteristics in the scanning direction become constant at the time of assembly, and a predetermined software corresponding to the misalignment is provided. It is an object of the present invention to complete the correction based on the fixed condition of the wear, thereby omitting all the adjustment means and adjustment steps after assembly.

[0008]

According to the present invention, as shown in FIG. 1, the phase relation a of the phase of the excitation position based on the step angle of the stepping motor and the phase a of the teeth of the timing pulley fixed to the rotating shaft of the stepping motor are determined. An assembly is held while always maintaining a constant value.

[0009]

According to the present invention, by assembling the stepping motor so that the excitation phase angle of the stepping motor and the phase angle of the teeth of the timing pulley are always maintained in a constant relationship, the output fluctuation of the stepping motor and the timing pulley are adjusted. The relationship of the load variation is always constant, and the printing shift characteristics can be unified. Therefore, there is no machine difference in the advance delay amount of the stepping motor, and the printing misalignment can always be eliminated with a predetermined correction amount, and the individual adjustment means and process after assembly are not required.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the figure, 1 is a stepping motor and 2 is a timing pulley. The carriage driving device of the printing apparatus has a timing belt stretched to reciprocate the carriage in addition to the above components. At the time of assembling, the excitation phase angle of the stepping motor 1 and the phase angle of the teeth of the timing pulley 2 are always maintained so as to have a fixed relationship, and the assembly is always performed while maintaining the fixed relationship. As means for maintaining the excitation phase angle of the stepping motor 1 and the phase angle of the teeth of the timing pulley 2 so as to always have a constant relationship, the phase positioning jig 3 can be used, or the shaft 11 of the stepping motor 1 or the like can be used. The timing pulley 2 may have a special shape.

(Embodiment 1) As means for maintaining the excitation phase angle of the stepping motor 1 and the phase angle of the teeth of the timing pulley 2 at the time of assembly so as to always have a fixed relationship, as shown in FIG. The phase positioning jig 3 is used. The phase positioning jig 3 has a motor positioning pin 31 and a pulley positioning portion 32, the stepping motor 1 is provided with a mounting flange hole 13 corresponding to the motor positioning pin 31, and the timing pulley 2 is provided with a pulley positioning portion 32. A corresponding positioning part is provided. When the timing pulley 2 is fixed to the stepping motor 1, the shaft 11 is supported by the exciting force by setting the stepping motor 1 to a two-phase excitation state.
On the other hand, the timing pulley 2 is held in a predetermined angular relationship with the outer shape of the stepping motor by using the phase positioning jig 3. Shaft 1 in this state
By press-fitting the timing pulley 2 into the motor 1, it is possible to assemble while always maintaining a constant relationship between the excitation phase angle of the stepping motor 1 and the phase angle of the teeth of the timing pulley 2.

In this embodiment, the stepping motor 1 has a phase positioning jig 3
It is necessary to have a portion provided with a mounting flange hole 13 so that the stepping motor 1 can be held at a fixed angle around the shaft 11. It is also possible to provide an index or the like on the outer shape and use this as a reference, and maintain a fixed angle using a separate fixing means.

The torque margin of the drive unit assembled in this way can always be as shown in FIG.

In this embodiment, a case is shown in which the phases that are the nominal values are matched. However, the effect of the present invention can be obtained by unifying the average value of the torque margin. Timing pulley 2
Regarding the phase angle of the tooth of each, the respective phase positions may be arbitrary.

(Embodiment 2) FIGS. 3A and 3B show means for maintaining the excitation phase angle of the stepping motor 1 and the phase angle of the teeth of the timing pulley 2 at the time of assembly so that the phase angle is always constant. In this manner, the phase positioning jig 3 may be provided with the pulley positioning protrusions 33, and the timing pulley 2 may be provided with the positioning holes 22 corresponding to the pulley positioning protrusions 33. Positioning hole 22
3b is managed in a predetermined relationship with the pulley teeth as shown in FIG. 3B. Therefore, by using such a phase positioning jig 3, the excitation phase angle of the stepping motor 1 and the teeth of the timing pulley 2 can be adjusted. Can always be in a constant relation with the phase angle of the phase.

(Embodiment 3) As means for maintaining the excitation phase angle of the stepping motor 1 and the phase angle of the teeth of the timing pulley 2 at the time of assembly so as to always have a fixed relationship, as shown in FIG. The embodiment can also be implemented by making the diameter of the shaft 11 of the stepping motor 1 D-shaped, and making the shaft positioning hole 21 of the timing pulley 2 correspondingly D-shaped. In this case, the timing pulley 2
By performing the D-cut processing on the shaft positioning hole 21 of the above, the use of the phase positioning jig 3 at the time of assembling and the excitation at the time of assembling the stepping motor 1 can be omitted. In this case, as shown in FIG. Stepping motor 1
In the step of magnetizing the rotor 12, the relationship b between the D-cut surface of the shaft 11 and the magnetization phase of the rotor 12 needs to be managed by another jig or the like. Also, the D-cut surface of the pulley needs to be managed in a predetermined relationship with the pulley teeth.

If the step angle of the stepping motor 1 and the angular pitch of the teeth of the timing pulley 2 are set to integral multiples, the superposition of the output torque and the load torque can always be reproduced periodically, so that the effect is further enhanced.

(Embodiment 4) FIG. 5 shows a step angle of 7.5 °.
Stepping motor and the number of teeth Z = 12 (angle pitch 30
°) shows a case of 1: 4. As described above, when the excitation phase angle of the stepping motor and the phase angle of the teeth of the timing pulley are maintained at a fixed angle, a drive device having the same characteristics can be obtained at all times, and the subsequent operation of correcting the characteristics Becomes easier.

FIG. 6 is an explanatory diagram of the most ideal case, in which the step angle of the stepping motor and the angle pitch of the timing pulley are 1: 1.

In this case, if the phase of the peak of the output torque of the stepping motor and the phase of the peak of the load of the timing pulley are made to coincide with each other, not only the average torque margin is unified, but also the load fluctuation of the timing pulley is offset. Therefore, it is also effective in suppressing speed fluctuation and vibration.

In the step of press-fitting the timing pulley into the shaft, when a hybrid motor or the like is used as a stepping motor and the detent torque is relatively large, a predetermined angular relationship can be maintained without exciting the motor. .

[0022]

According to the present invention, the excitation phase angle and the timing of the stepping motor as described in the first to fourth embodiments are used.
Press-fitting and assembling the phase angle so that the phase angle of the pulley teeth is always in a predetermined relationship, the torque margin during driving can be unified, the delay amount of the carriage is always the same, Since the addressing hysteresis, that is, the print shift correction amount can be unified, the correction can be completed with a predetermined amount, and the print shift can be eliminated without adjustment after assembly.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an excitation phase angle of a stepping motor and a phase angle of a tooth of a timing pulley.

FIG. 2 is an explanatory diagram of an assembling method according to the first embodiment of the present invention and a result thereof.

FIG. 3 is an explanatory view of an assembling method according to a second embodiment of the present invention.

FIG. 4 is an explanatory view of an assembling method according to a third embodiment of the present invention.

FIG. 5 is an explanatory view of Embodiment 4 of the present invention.

FIG. 6 is an explanatory diagram of a most ideal case according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view of a carriage driving device of the printing apparatus.

FIG. 8 is an explanatory view of a conventional assembling method and a result thereof.

[Explanation of symbols]

1 stepper motor, 11 shaft, 12
Rotor, 13 mounting flange hole, 2 timing pulley, 21 shaft positioning hole, 22 positioning hole, 3 phase positioning jig, 31 motor positioning pin, 32 pulley positioning section, 33 pulley positioning protrusion, 4 timing belt, 5 carriage .

Claims (6)

[Claims] 1. A printing method comprising: a driving stepping motor; a timing pulley fixed to the stepping motor; and a timing belt stretched between the timing pulley and a carriage to reciprocate the carriage. A method of assembling a carriage driving device of an apparatus, wherein the assembling is performed while always maintaining a constant relationship between an excitation phase angle of the stepping motor and a phase angle of teeth of the timing pulley. 2. The assembling method according to claim 1, wherein the stepping motor is set in an excited state at the time of assembling. 3. The method according to claim 1, wherein the step angle of the stepping motor used in the assembly and the angular pitch of the teeth of the timing pulley are in an integral multiple.
The assembling method according to 1. 4. A step angle of a stepping motor used for assembling and a pitch angle of teeth of a timing pulley have a relation of 1: 1, and a variation in output torque of the stepping motor and a variation in load of the timing pulley are different. ,
The assembly method according to any one of claims 1 to 3, wherein phases indicating the respective median values of fluctuation are matched. 5. A printing method comprising: a stepping motor for driving; a timing pulley fixed to the stepping motor; and a timing belt stretched between the timing pulley and the carriage to reciprocate the carriage. A carriage driving device for a printing apparatus, wherein a step angle of a stepping motor and an angular pitch of teeth of a timing pulley have an integer multiple relationship. 6. A printing method comprising: a stepping motor for driving; a timing pulley fixed to the stepping motor; and a timing belt stretched between the timing pulley and the carriage to reciprocate the carriage. In the carriage driving device of the apparatus, the step angle of the stepping motor and the angular pitch of the teeth of the timing pulley have a 1: 1 relationship, and the output torque fluctuation of the stepping motor and the load fluctuation of the timing pulley. Is a carriage driving device for a printing apparatus, wherein the phases indicating the respective median values of fluctuations coincide with each other.