JPS6110477A - Pulse motor driving method for printer - Google Patents

Abstract

PURPOSE:To enable to effectively prevent stresses from being generated between members of a driving gear and those of a driven gear, by stopping a driving pulse motor after reversely rotating the motor by one step, when stopping the motor at a predetermined position. CONSTITUTION:For example, where the pulse motor used in the printer is set to be stopped at four-pulse input positions A, C, E, G, the pulse motor located at the stopping position A receives an input of 5 pulses, whereby it is rotated forward by 5 steps to the position D, then it receives an input of one pulse in the reverse direction, whereby it is reversely rotated by one step, and is stopped at the position C. After printing at the position C, printing is similarly conducted sequentially at the positions E, G. Accordingly, the driving gear 13 on the pulse motor side and the driven gear 15 on the driving mechanism side are not engaged to each other when operating a printing mechanism or the like, no stress is generated in the teeth of the gears at the time of stoppage of the motor, and stress cracking and stress deformation can be prevented from occurring.

Description

[Detailed description of the invention]

[Field of Application of the Invention] The present invention relates to a printer carriage and a paper feeding Isogiri. The present invention relates to a method of driving a pulse motor that also drives a platen, etc., and particularly to a method of driving a pulse motor that is less likely to generate unnecessary stress between the drive 11 and the mechanism. [Backbone of the Invention] An example of a conventionally known printer is a thermal printer shown in FIG. In this figure vc, l is the frame forming the main body, 21
3 is the platen 20 on which the recording paper is wound.
Printing position on the front [- with the platen rubber attached to 9)
4). 4 is arranged to face platen 2)
5 is a tape cassette; 6 is a cassette holder that holds the tape cassette 5 and laterally supports a cassette shift mechanism to be described later. The entire cassette shift mechanism is supported by a carriage 7, which will be described below, located below the tape cassette 5. 7a
The shaft extends along the platen 2 and passes through the carriage 7, which will be described later, and is centered on a rotatable shaft. Although not shown, the left end VC of the shaft 7a is a cam,
A worm wheel is provided integrally with the shaft 7aK, and a pulse motor 8 rotates a worm (not shown) that engages with the worm wheel, thereby rotating the shaft 7a. In addition, 9 is the above-mentioned shirt) 7a with an integral VC installed on the cam (
It is a lever that has one end that is engaged, and the support is also rotatable around 1110, and the other end is moved in the left and right direction shown in the figure. Note that this slider 11 is integrally provided with a rotating function I'I on the output shaft of a pulse motor 12, and gears are formed on both sides of the slider 11. The gear in the section is pulse motor 1.
The drive gears 13 and 14 can be selectively engaged with the drive gears 13 and 14 that are loosely fitted to the output shafts of the second output shafts. Further, 15 engages with the drive gear 13, and this drive gear 13
It is a driven gear that rotates integrally with the main body, and has a bevel gear 16 on the side. Reference numeral 17 denotes a bevel gear that engages with the bevel gear 16, and is provided integrally with a pulley 19 having a protrusion 18 on the circumferential side. A metal belt 20 is connected to a carriage 7 at both ends, which will be described later, and has a square hole 21 that engages a protrusion 18 of a pulley 19.
have. 22 was stationed on the opposite side of Boo 9190,
The metal belt 20 is wound around a pulley. -I-statement

[7 metal belt 20. Pulley 19, 22゜Uber weight 17. A driven gear 15 having a bevel gear 16 and a slider 11 move a carriage 7 holding a thermal head 4° tape cassette 5 or the like along the platen 2, that is, in the left-right direction in the drawing, via a drive gear 13 connected to a pulse motor 12. V6 carriage transfer machine 11133
It consists of Also, 2:3)'j is a driven gear that engages with the driving gear 14, and has a small-diameter gear 24, which is rotatably loosely fitted to the paper feed shaft 25. 26 is a gear A gear 24 is engaged with the paper feeding shaft 25, and a small diameter gear 27 is provided on the side thereof.A gear 28 is engaged with the gear 27 and is rotatably attached to the paper feed shaft 25. In addition, 29 is a sprocket provided integrally with the paper feed shaft 25, and has protrusions 30 on the same surface that are fitted into holes formed, for example, at both edges of the recording paper. 25. Gear 28.
Gear 26 with gear 27. The driven gear 23 having the gear 24 and the slider 11 move the recording paper 31 wound around the platen 2 and shown by the two-dot chain line in a direction intersecting iCi° with the feeding direction of the carriage 7, that is, in the direction of the arrow 32. 4) Pulse motor 12VC is connected to the drive gear 14.
(The autumn feed mechanism 34 is configured as F). Also, lII! i & r As shown in the figure/[A,'] The head 4 is connected to the platen 2 via a cam (not shown) or the like on the shaft 7a.
The j11 connection is set to be disconnected. Next, let us discuss the carriage transporting operation and paper feeding operation of this -real printer. (1) [Carriage transfer operation] As the pulse motor 8 shown in FIG.
rotates counterclockwise in FIG. 1 about the support shaft 10&. Therefore, the slider 11 engaged with the lever 9 moves to the left in FIG. 1, and the gear formed on the left side of the slider 11 engages with the drive gear 13. Here, when the pulse motor 12 rotates, the slider 11 rotates,
As the drive gear 13 rotates, the driven gear 15-f, that is, the bevel gear 16 rotates, and as the bevel gear 16 rotates, the bevel gear 17, that is, the boo IJ19 rotates f6°, and the pulley 19 rotates. Metal belt 20 has been moved!
ltl+L, thereby tape cassette 5, thermal head 4. An L-carriage 7 carrying a cassette shift mechanism and the like moves in the left-right direction in FIG. 3, that is, along the platen 2. (2) [Paper feeding operation] When the pulse motor 8 shown in FIG. 3 rotates, the lever 9 moves around the spindle 10 via a worm, a worm wheel, and a cam (not shown) into the state shown in FIG. 3, that is, as described above. Rotate clockwise from the carriage drive operation state.
Fro. Therefore, the slider 11 located on the lever Q vC engaging base (7) moves to the right in FIG.
Engage with 'flo'. Here, the pulse motor 12 rotates f.
The slider 11 rotates, and as the slider 110 rotates, the gears 14.23, 24, 26, 27.28 rotate 17.
, the paper feed shaft 25 rotates, and the sprocket 29 rotates as the paper feed shaft 250 rotates. Then, the recording paper 31 that has been wound around the platen 2 is fed by a predetermined distance of -1, for example, one line, in the direction of arrow 32, which intersects the moving direction of the carriage 7 (f'1.7). Although not specifically mentioned here, the screw motor 8 is also used to shift the tape cassette 5 by rotating the shirt 7a'. By the way, in this conventional printer Vr, the carriage 7 is transported and the paper feeding mechanism is driven using the pulse motor 12 as in the above Me. A pulse motor is also called a stamping motor, and is configured so that when a pulse is sent once to the driving head of the pulse motor, the motor rotates by a certain angle (step angle). ) Compatible with digital control and suitable as an incremental drive motor. (2) Since it rotates in synchronization with an external input signal, it can also be used as a variable speed synchronous motor. (3) The generated torque is large relative to the moment of inertia of the rotor, and the start-up force is much higher than that of a normal synchronous motor.Also, it maintains a constant position, and r5 and It also has a large resistance torque against force. (4) Unlike the brushes of a DC motor, there is no need to worry about mechanical wear and maintenance is not required. The application of this motor has become popular in recent years.The conventional examples mentioned above also use pulse motors for these five reasons.
However, there is one problem with using this pulse motor. As shown in Figure 4, the conventional pulse motor drive method is to always rotate in one direction for a predetermined number of pulses, for example, to move the carriage 7 or feed paper, and then print while stopping at 1 tVc. This occurs because the cycle of rotating in the same direction by a predetermined number of pulses and then stopping is repeated. That is, in this driving method, as shown in FIG. 5, the drive gear 13.14 connected to the pulse motor and the driven gear 15.23 connected to the carriage transfer mechanism 34 or the paper feed mechanism 33 are always in pressure contact, and during this pressure contact, As mentioned above, the characteristic of pulse motors is that the resistance torque against external force is large7)
It is quite large due to its size, and Konera's drive gear 1
Stress is applied to the teeth I'c of the driven gear 15.14 and the driven gear 15.23 which are in VC mesh with each other, and this stressed state is maintained during the stops 1 to 1. Usually, these driving gears 13.14 and driven gears 15.2
3 is molded from a synthetic resin material, so if the stress condition is maintained, stress cracking and stress deformation are likely to occur.
These cracks and deformations result in malfunction. Therefore, in the conventional method of driving a pulse motor, which repeatedly rotates and stops only in the same direction to move the carriage 7 or drive the paper feed mechanism 33, there is always a risk of malfunction and short-term maintenance is required. was needed. [Object of the Invention] The present invention has been made in view of the actual situation in the prior art, and its purpose is to improve the pulse motor in the printer, which eliminates the need for maintenance related to the drive mechanism and malfunction of the printer. Driving method/prayer f＞,
, KotoπAi. [Summary of the invention] In order to achieve this objective 4, the present invention has a main body shaped like rt'.
A frame that is arranged in a direction, a platen on which the A11 recording paper comes into contact, a carriage that can be transported along this platen, a wall print head that is attached to this carriage and whose pupils are oriented so as to face the platen, and a platen. A paper feeding mechanism that feeds the recording paper between the print head and the platen, working together with or independently of the platen, a pulse motor that drives the carriage transport: td and the paper feeding mechanism, and a pulse motor that drives the driving force of the pulse motor. In a printer equipped with a transmission drive means for the carriage transport mechanism, paper feed mechanism, etc., in order to eliminate stress on the drive mechanism due to carriage transport and paper feed drive, the pulse motor drive method is changed to a predetermined method. 1. The configuration is such that the pulse motor is stopped by moving back at least one step from the drive step. Fig. 1 is an explanatory diagram showing the relationship between the 1゛1< moving step of the pulse motor and the 1゛1< moving step of the pulse motor of this invention. The motor is used in the conventional printer shown in Fig. 3 and is equivalent to the b-pulse motor 8.12, with the only difference being the driving method. Explanation of each part of the printer 1'f is omitted. Assuming that the pulse motor 12 used in this printer is set to stop at 4 pulse input positions @A, C, B, and Q, for example, the conventional driving method is as shown in FIG. , when 4 pulses are input, the pulse motor 12 moves in the same direction [proceeds 4 steps and moves from stop position A to stop position C].
If there is further IC4 pulse input, it will move from the stop position [C to stop position E, and if there is further ff4 pulse input, it will go to the stop position [13
The cycle from to stop position G is followed,
In the method of the present invention, 5 pulses are input from the stop position #A, the motor advances to the 1) position in 5 steps, and then the motor moves in the backward direction V.
C1 pulse manually, l step back, 0th place 1IIv
y stop d-L, after printing etc. at this stop position #C, further [5 pulses are input and it moves forward to F position, further l pulse is input in the backward direction, l step goes back and E The pulse motor 12 is driven in a cycle in which the motor stops at the position G, then similarly receives 5 pulses from the E position, moves forward to the H position, receives a pulse reception signal, returns to the stop position G, and stops. I apologize <). When driven in this way, a total of 6 pulses are required to drive from stop position A to stop position C.
Since the last pulse acts to reverse the pulse motor 12, as shown in FIG. 2, the drive gear 13 (14) on the pulse motor 12 side and the driven gear 15 on the drive mechanism side
(23) do not mesh with each other during operation of the printing mechanism, etc., and the teeth of both gears +3 (+4) and 15 (23),
No stress occurs when stopping. In this way, when the pressure contact time between the driving gear 13 (+4) and the driven gear 15 (23) is the longest and the pulse motor 120 stops 1, the members do not come into pressure contact and both gears 13 (34) and 15 (23) Not creating stress on the tooth-forming stone member effectively suppresses stress cracking, stress deformation, etc. that occur in the stiff member. That is, since stress is generated in the member VC only when the carriage 7 is transferred and when the paper is fed, the stress state does not persist for a long time, and the occurrence of the above-mentioned deformation etc. is extremely reduced. Although this embodiment and the conventional example use a thermal printer, the method of the present invention is applicable not only to non-impact printers such as electrostatic printers, discharge breakdown printers, and energized printers. It can also be applied to impact type printers such as wire dot printers and type selection type printers.In addition, in type selection type printers, it can be applied not only to paper feed and carriage transport but also to the type selection mechanism, and ribbon cassettes. It can also be applied to shift mechanisms, ribbon feeding mechanisms, etc. [Effects of the invention] The present invention 5. As is clear from the explanation given below, the pulse motor used for driving the printer has a predetermined stopping position t.
& When stopping VC, go back one step and stop -(-6
With this configuration, it is possible to effectively suppress the occurrence of stress between the members of the drive gear connected to the pulse motor and the driven gear connected to the drive mechanism. (2) Since stress cracking and stress deformation of the members of both gears cannot be minimized, printer malfunctions can be effectively prevented. (3> (21) For the same reason, maintenance related to the drive mechanism can be kept to a minimum and maintenance costs can be reduced.

[Brief explanation of the drawing]

1 is an explanatory diagram showing the relationship between the input J1 pulse and the drive step σ) in the pulse motor drive method according to the present invention,
Box 2 Figure 1. ↑, Figure 3 shows the relationship between the driving gear and the driven gear when the present invention is applied at t7. Plan view showing lj '9, 4th
FIG. 5 is an explanatory diagram showing the relationship between input pulses and drive steps in a conventional pulse motor driving method, and FIG. 5 is an explanatory diagram showing the relationship between a conventional driving gear and a driven gear. l...Frame, 2...Platen, 4
...Thermal head, 7... Carriage, 8, 12... Pulse motor, 33...
... Carriage transfer machine + a, 34 ... Paper feeding mechanism. Figure 1 Tanu No. 21

Claims (1)

[Claims] A frame forming a main body, a platen on which the recording paper comes into contact, a carriage movable along the platen, a print head attached to the carriage and arranged to face the platen, and a print head that cooperates with the platen or A paper feeding mechanism that feeds recording paper between the print head and the platen independently of the platen, a pulse motor that transports the carriage and drives the paper feeding mechanism, and the driving force of this pulse motor is used to transfer the driving force to the carriage transport mechanism, paper feeding mechanism, etc. In a printer equipped with a drive means for transmitting a signal to the printer, the pulse motor is stopped after returning at least one step from a predetermined drive step in order to eliminate stress on the drive mechanism due to carriage transport and paper feed drive. Pulse motor drive method for printers.