JPS63295286A - Printer - Google Patents

Abstract

PURPOSE:To achieve miniaturization and lightening of a printer by simplifying assembly and adjustment thereof, by enabling rotation to be regulated within a range of not less than one half of a rotary angle of a driving step motor required for the motor to move from a phase capable of drive switching a carriage transfer to a paper feed to a phape capable of next switching. CONSTITUTION:A step motor 1 is fixed to a printer body via metal fittings 2 and can be rotationally adjusted to the motor metal fittings 2 by fitting long holes 1-a. An adjustable range, since phase agrees with the same phase, for instance, each rotary angle (15 degrees) of two steps of the step motor, is enough to be not less than one half thereof, i.e. 7.5 degrees. Further, a motor gear 6 is forcibly fit to a rotary axis 1-b, and the other parts are integrated into the printer body. After tuning a phase of a large diameter gear 5-6 of an inner gear 5 to a phase of a gear part 4-a of an arm gear 4, the motor metal fittings 2 are rotationally adjusted under a state where the motor gear 6 together with the step motor 1 which is excited in a specific pattern is engaged with a planetary gear 3, and are fixed to the printer body. Thereafter, fitting screws are fastened to be locked.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a printer used by being connected to or built into an information processing device or the like. In particular, the present invention relates to a serial printer that moves a carriage and feeds paper using a single driving step motor using drive switching means using a planetary gear mechanism.

2. Description of the Related Art Serial printers generally require a carriage moving means for reciprocating a carriage in one direction and a paper feeding means for driving printing paper in a direction perpendicular to the carriage. In high-end models, drive sources such as step motors are provided independently for each of these drives, but in small and low-priced models, the driving force of a single motor is often switched and driven alternately. In this case, drive switching means for carriage movement and paper feeding is required, but in both cases the apparatus can be made smaller and lighter, and costs can be reduced. The driving source of this drive switching means may be the case where the driving force of the driving motor itself is used, or the case where a solenoid or the like is separately provided and used as the driving source. Further, as a motor as a driving source, a DO motor or a step motor can be considered, but a step motor is often used for reasons such as single positioning and ease of control.

As mentioned above, many products have recently been announced that drive carriage moving means and paper feeding means by switching the driving force from a single driving source in various ways. As shown in No. 107557, by connecting a drive source, a carriage moving means and a paper feeding means to each of the three rotating parts of the planetary gear mechanism, and fixing only one of the carriage moving means and the paper feeding means. A printer has been devised that employs drive switching means for driving the other drive. This will be explained below using FIG. 2.

The drive switching means in this conventional example is the input gear 13.
, a planetary gear 24 , a carriage moving gear 14 , a single paper feed gear 16 , a selection lever 21 , and a solenoid 22 .

The input gear 13 consists of a gear portion 13-a that meshes with the pinion gear 12 press-fitted into the rotating shaft of the step motor 11, and a planetary gear support shaft 13-b.
A planetary gear 24 is rotatably attached to b. The planetary gear 24 is located inside the gear section 14- of the carriage moving gear 14.
C and the small diameter gear portion 15-b of the paper feed υ gear 16. Further, the outer gear portion 14-a of the carriage moving gear 14 and the large-diameter gear portion 16-a of the paper feed gear 150 are formed with tooth profiles of the same diameter and pitch, and are engaged with the free end of the sheet 1 selection lever 21. match.

This selection lever 21 is connected to a solenoid 22 and a tension spring 2.
3 and the 1 normal selection lever 21 is connected to the tension spring 2.
3 acts to fix the paper feed gear 15 (
(Situation shown in Figure 2).

If the step motor 11 is driven in this state.

The carriage moving gear 14 rotates, and the outer gear portion 14-
The carriage 20 can be moved by the action of the wire 19 by driving the drive pulley 16 that meshes with the drive pulley 16 b.

Next, the solenoid 22 is energized, the selection lever 21 is fixed to the carriage moving gear 14, and the step motor 11 is
When driven, the paper feed gear 16 rotates, and the paper feed roller 18 rotates via the paper feed shaft 17 press-fitted into the paper feed gear 16, making it possible to feed the paper.

A printer using a drive switching means using this planetary gear mechanism has features such as being able to reduce the size and weight of the device, reduce costs, and improve reliability by making each operation accurate and reliable. This is because the fixed side is switched by moving or rotating the fixing means from one of the carriage moving means and paper feeding means to the other, so one side is always fixed except at the moment of drive switching. .

This is because it is resistant to fluctuations caused by external disturbances.

Problems to be Solved by the Invention However, at the moment of drive switching, both the carriage moving means and the paper feeding means must be in a lockable phase state.

That is, the outer gear portion 14-& of the carriage moving gear 14 and the large diameter gear portion 15-2 of the paper feeding gear 150
It is necessary that the phases of L match and that the free end of the selection lever 21 can move smoothly.

In order to realize such a switchable state, the gear system as a whole must be designed and assembled so that specific phase conditions are satisfied.

That is, since the rotating shaft of the step motor 11 can only be stopped at the phase of each step angle, the phase of the pinion gear 12 press-fitted therein and the phase of the gear system that meshes with it also depend on the phase of the rotating shaft of the step motor 11. It's decided. Therefore.

Binion gear 12 in a specific excitation state of the step motor
The phase (relative angular position of the teeth) must be kept constant with respect to the gear system that meshes with it (and therefore with respect to the printer body).

By the way, if you try to eliminate the need to adjust the mounting position (angle) of the step motor when assembling the printer, the relative angular position (in the excited state) between the mounting hole of the step motor to the printer body and the teeth of the pinion gear 12 will be constant. Step Tanabata must be used. However, press-fitting a gear into a step motor's rotation shaft at a specific phase poses a precision problem, and it is considered difficult to do so due to variations in the step motor itself, so it is necessary to adjust these phase relationships during assembly. required and poses assembly problems.

Therefore, the present invention provides a serial printer in which carriage movement and paper feeding are performed by a single drive step motor using drive switching means using a planetary gear mechanism, in which the phase of the gear system as described above can be easily adjusted. It is intended to.

Means to solve problems The technical means of the present invention to solve the above problems is as follows.

The rotation of the drive step motor can be adjusted within a range of more than half of the rotation angle of the drive step motor required to reach the next switchable phase from one phase to the next switchable phase for carriage movement and paper feed. It is necessary to attach it to the printer body.

Function The assembly procedure for the above configuration is as follows. That is, the carriage moving means 1 paper feeding means, drive switching means, etc. are incorporated into the printer body,
After setting the phase to enable switching between carriage movement and paper feed, a drive step motor that is excited in a specific pattern is attached. Since there is at least one place within this range where the phases match, assembly is possible without any problems.

Example An embodiment of the present invention will be described with reference to FIG.

FIG. 1 shows the drive mechanism part of the printer of the present invention.
FIG. 1(a) is a front view, and FIG. 1(b) is a side view (partial view).

A motor gear 6 is press-fitted into the rotating shaft 1-b of the step motor 1, and the motor gear 6 meshes with the planetary gear 3. This planetary gear 3 is an internal gear part 5- of an inner gear 6.
At the same time as it engages with IL, its rotating shaft portion is connected to arm gear 4.
It is rotatably supported by a planetary gear mechanism.

Here, the gear portion 4-a of the arm gear 4 is connected to the carriage moving means (not shown), and the small diameter gear portion 5-a of the inner gear 6 is connected to the carriage moving means (not shown).
Q are respectively connected to paper feeding means (not shown) and transmit input from the step motor.

Stopper 7 is carriage fixing part-a1 paper feed fixing part 7
-b, and the carriage fixing part 7-a has a tooth profile that meshes with the gear part 4-IL of the arm gear 4, and the paper feed fixing part 7-b has a tooth profile that meshes with the large-diameter gear part 6-S of the inner gear 6. has been done. In the stopper 7, the paper feed fixing part 7-b is normally engaged with the large diameter gear part 5-b of the inner gear 5 by the spring 9.

It is biased in a direction that fixes it. In this state, the carriage fixing part 7-1 is attached to the gear part 4 of the arm gear 4.
-! It is not engaged with L, and when the step motor rotates, the carriage moves.

Next, the step motor 1 rotates and the carriage fixing part 7
-& and the gear part 4-& of the arm gear 4 are in a phase in which they can engage, and when the solenoid 8 is energized, the carriage fixing part 7-& and the gear part 4-IL of the arm gear 4 are engaged, and the inner gear The large diameter gear portion 6-b of No. 6 is opened to allow paper feeding. This constitutes drive switching means for selective selection.

To give a numerical example used in this example, step motor 1
The step angle is 7.5 degrees, motor gear 6, planetary gear 3.
The number of teeth in each of the internal gear parts 6-& of the inner gear 6 is 15.
, 15.45 sheets, and the module is 0.6. Further, the gear portion 4-IL of the arm gear 4 has 96 teeth and a module of 0.4, and the large diameter gear portion 5-b of the inner gear 5 has 7 teeth.
2. The module is set to 0.6. At this time, when the step motor 1 is rotated by two steps while the inner gear 6 is fixed, the arm gear 4 is rotated by 3.76 degrees. This corresponds to the number of teeth of arm gear 4, which is 96.

Also, if the arm gear 4 is fixed and the step motor 1 is rotated by two steps, the inner gear 6 will rotate by 6 degrees.
This corresponds to the number of teeth of the large diameter gear portion sb of the inner gear 6. Therefore, if the step motor 1 is in a phase that can be switched in a certain excitation state, it will be in a phase that can be switched every two steps of rotation. Therefore, adjustments are required during assembly.

In this embodiment, as shown in FIG. 1(a), a step motor 1 is fixed to the printer main body via a motor mounting bracket 2. As shown in FIG. Step motor 1 is attached to long hole 1-IL
The rotation of the motor mounting bracket 2 can be adjusted. In this embodiment, the adjustable range is only one, since the phase matches every two steps of the rotation angle (16 degrees) of the step motor, so it is sufficient to have a range of 7.5 degrees or more, which is one-half of the rotation angle.

The assembly and adjustment method for such a configuration is as follows.

. First, attach the step piece 1 to the motor mounting bracket 2. At this time, the mounting screw 1o is not completely tightened, and the step motor 1 and the motor mounting bracket 2 are allowed to rotate within the range of the mounting elongated hole 1-IL. Further, it is assumed that the motor gear 6 is press-fitted into the rotating shaft 1-b.

Next, the other parts are assembled into the printer body, and the large diameter gear s-b of the inner gear 6 and the gear part 4- of the arm gear 4 are assembled.
After matching the phase of a, the step motor 1 is excited in a specific pattern, and the motor gear 6 is meshed with the planetary gear 3. In this state, adjust the rotation of the motor mounting bracket 2 and fix it to the printer body, and then
All you have to do is tighten 0 to lock it.

Incidentally, once such adjustment is performed, it is sufficient to remove the step motor 1 for each motor mounting bracket 2, and no adjustment is necessary when reassembling the motor.

As described above, the printer of this embodiment can be easily assembled and adjusted, and furthermore, if a separate motor mounting bracket is provided, there is an advantage that no adjustment is required during reassembly.

Effects of the Invention According to the present invention, a carriage moving means, a paper feeding means, a single driving step motor tractor, a drive transmission system each connected to three rotating parts of a planetary gear mechanism, and a carriage moving means and a paper feeding means are provided. To simplify the assembly and adjustment of a printer equipped with a drive switching means consisting of a feeding means and a fixing means for selectively fixing the feed means, to ensure reliable drive of gear connections, and to create a compact and lightweight printer. Can be configured.

[Brief explanation of drawings]

1A and 1B are a front view and a side view showing a drive mechanism portion of a printer according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a conventional printer. 1...Step motor, 2...Motor mounting bracket, 3...Planetary gear, 4...
・Arm gear, 6... Inner gear, 6...
...Motor gear, 7...Stotsu'(0

Claims (2)

[Claims] (1) Select a drive transmission system in which a carriage moving means, a final feeding means, and a single drive step motor are respectively connected to three rotating parts of a planetary gear mechanism, and the above-mentioned carriage moving means and paper feeding means. and a drive switching means constituted by a fixing means that selects and fixes one drive, and the drive step described above is necessary from a phase in which carriage movement and paper feeding drives can be switched to a next switchable phase. A printer characterized in that a drive step motor is attached to a printer main body so that its rotation can be adjusted within a range of one-half or more of the rotation angle of the motor. (2) The printer according to claim 1, wherein the drive step motor is attached to a motor attachment means that is a separate part from the printer body, and is attached to the printer body via the motor attachment means.