JPH0630911B2 - Serial printer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a type wheel selection type serial printer.

[Prior Art] In the conventional type wheel selection type serial printer, the type wheel mounted on the carriage is driven by a drive source arranged on the side of the printer or its train wheel to select the type character. Desired by repeating each process of printing and carry 1
I was printing a line.

However, as the number of digits to be printed increases, it is required to further increase the printing speed, and further downsizing of the printer and reduction of current consumption have been demanded. However, the above-mentioned conventional technique has a problem that it is not possible to meet these requirements.

The present invention has been made in view of such drawbacks, and its object is to increase the printing speed,
Another object is to reduce the number of parts and provide printers and products at low cost.

[Means for Solving the Problems] Therefore, in order to solve the above problems, the serial printer of the present invention includes a carriage that moves in a direction orthogonal to the conveyance direction of the printing paper, and one of a plurality of type wheels on the carriage. In a serial printer that selects and prints on a carriage, a first drive source, which is a motor mounted on the carriage, a first transmission means that transmits the rotation of the first drive source to a printing wheel, and a carriage that are arranged on the carriage. Third transmitting means for transmitting the driving force of the first drive source to the hammer that presses the type on the printing paper, second transmitting means for moving the type wheel in the print digit direction with respect to the hammer, and first First switching means for switching transmission of power from a power source to either one of the first transmission means and the third transmission means, and connection or disconnection of power of the first transmission means to the second transmission means. The second switching means and the cap A second drive source for moving the ridge in the print digit direction, and the first transmission means and the second transmission means are characterized in that the carriage is driven during movement by the movement means.

[Operation] According to the above configuration of the present invention, the first drive source mounted on the carriage drives the type wheel, shifts the type wheel, and prints, and the second drive source moves the carriage. , The process of selecting the characters to be printed while the carriage is moving can be started.

〔Example〕

 Embodiments will be described below with reference to the drawings.

FIG. 1 is a plan view showing a schematic configuration of an embodiment of the present invention. Reference numeral 1 denotes a motor, which drives the type wheel shaft 12 through a few deceleration means. The type wheel group 10 is restricted in rotation direction with the type wheel shaft 12, is free to move in the axial direction (arrow α direction), and is always urged in the axial direction by the type wheel spring 11. Reference numeral 4 denotes a selection and print trigger mechanism. When the trigger magnet is energized, the type wheel group 10 that is normally rotating is in a stopped state, and the print switching mechanism A13 that is normally stopped switches the power of the motor 1 from the type wheel shaft 12. It begins to rotate. Further, when the current of the trigger magnet is cut off, the print switching mechanism B14 which is normally stopped is changed to the print switching mechanism A13.
The printing cam 15 is driven by the hammer 16 so that the hammer 16 pushes out one type of the type wheel group 10 inked by the ink roll (not shown) from the inside, Printing is performed on the printing paper 27. Details will be described later.

Reference numeral 5 denotes a digit shift trigger for the type wheel group 10. The digit shift trigger 5 causes the digit shift switching mechanism 6 that is in a non-engagement state with the type wheel axle 12 and is stopped to engage with the type wheel axle 12 that is rotating. Then, the rotation is started, the digit shift cam 7 is driven, and the digit shift follower 8 is moved in the arrow α direction. Since the digit shift follower 8 does not rotate in the rotation direction but moves only in the direction of the arrow α and is in contact with the group of type wheels 10, the type wheel group 10 urged by the type wheel spring 11 is moved in the direction of the arrow α. Then, the desired type and the tip 16-1 of the hammer 16 are aligned. Reference numeral 9 is a digit shift position detector that detects the rotational position of the digit shift cam 7, that is, the position of the character wheel group 10 in the direction of the arrow α, and 17 is a character detector that detects the rotational position of the character wheel group 10. , 18 are carriages equipped with the respective mechanisms of 1 to 17, and printing can be performed in the width direction of the printing paper 27 by moving the carriage 18 in the arrow β direction. The carriage 18 is moved by transmitting the forward and reverse rotations of the stepper motor 21 to the wire 23 wound around the drum 22 and connecting the wire 23A to the carriage 18. The paper feed of the print paper 27 is obtained by rotating the stepper motor 21 through the paper feed switching mechanism 24 and intermittently rotating the paper feed roller 25.

Next, a perspective view showing the main configuration of the deceleration and trigger means is shown in FIG.
Shown in Figs. FIG. 2 is a view showing the configuration of parts other than the lever, FIG. 3 is a view obtained by assembling a part of FIG. 2, and FIG. 4 is a view showing the positions of the levers. It should be noted that in FIG. 2, the same parts and connected parts are shown separately for the sake of explanation. The power transmission will be described with reference to FIGS. 2, 3 and 4. Rotation of the motor shaft 1-1 in the direction of arrow A drives the motor gear 40 fixed to the tip of the motor shaft 1-1 in the direction of arrow A. To do. The motor gear 40 becomes a sun gear of a planetary gear mechanism that constitutes a differential mechanism, and the motor shaft 1-1
Also serves as the axis of each gear. The planetary gear mechanism is the planetary gear 41.
And a selective drive gear 43 having a shaft 43-1 of the planetary gear 41 and an internal gear 42, the selective drive gear 43 drives the selective gear 3, and the internal gear 42 prints via a 1/3 rotary clutch described later. The cam 15 is driven. In order to rotate the type wheel group 10 in the direction of arrow D, if the ratchet 44 integrally formed with the internal gear 42 is prevented from rotating by the claw 55-1 of the selection claw 55, the planetary gear 41 moves in the direction of arrow B. Furthermore axis 4
The selective drive gear 43 rotates in the direction of arrow C via 3-1. The selection gear 3 is driven by the selection drive gear 43 to rotate the type wheel shaft 12 in the direction of arrow D. Next, the rotation of the ratchet 51 integrally formed with the rotating selection gear 3 is restricted by a claw 55-2 of the selection claw 55 (not shown broken in FIG. 4 and shown in FIG. 5), At the same time, when the ratchet 44 is released, the rotation of the motor gear 40 causes the internal gear 4 to rotate.
2 is driven in the direction of arrow E.

When the trigger coil 53 is energized, the trigger plate 52 is attracted in the direction of arrow F by the trigger yoke 54 rotating in the same manner as the type wheel shaft 12, and the rotation of the trigger yoke 54 causes the trigger plate 52 to rotate in the direction of arrow D. The trigger plate 52 drives the selection claw 55 and the operating lever 56 shown in FIG. 4 in the arrow G direction. Here, the axial positions of the ratchets and the levers will be described with reference to FIGS. Claw 55-1 is ratchet 4
4 and one of the three control disks 46 of the 1/3 rotary clutch, one of which is the ratchet 46-1, is engaged with two points, and the tip 56-1 of the operating lever 56 is the second of the control disk 46. Engage with ratchet 46-2. The other claw 55 of the selection claw 55-
3 engages with a return cam 50 integrally formed with the main portion 49 of the 1/3 rotary clutch. Reference numeral 59 is a two-stable spring for ensuring the operation of the selection claw 55. Further, in FIG. 2, the same parts are shown by dividing them into the motor shaft 1-1, the motor gear 40 and the type wheel shaft 12, and those connected by integral molding are the selective drive gear 43 and the planetary gear. 41, a shaft 43-1, an internal gear 42, a ratchet 44, a ratchet 45 used for a 1/3 rotary clutch, a main portion 49 of the 1/3 rotary clutch, a return cam 50, a print cam 15, and a selection gear 3.
And Ratchet 51.

Next, the operation of the main part will be described with reference to FIG. See FIGS. 2, 3 and 4 for the positional relationship in the plane direction of FIG.

FIG. 5A shows a state in which the selection ratchet 51 is rotating, that is, a selection standby state. The ratchet 44 and the ratchet 46-1 are restrained by the claw 55-1 of the selection claw 55, and the claw 55-2 is the selection ratchet. No contact with 51. Reference numeral 47 is a clutch pawl and is a shaft 49 of the clutch main portion 49.
-1 and is urged in the direction of arrow I by the clutch spring 48, and the pawl pin 47-2 is further connected to the hole 46 of the control disk 46.
-4 is loosely inserted, and the control disc 46 applies torque to the clutch main portion 49 in the direction of arrow E (see FIG. 2).

FIG. 5B shows a state in which the selection claw 55 and the operating lever 56 are rotated in the direction of arrow G by the rotation of the trigger plate 52 in the direction of arrow D (FIG. 4). The selection ratchet 51 has a claw 55-
2 and the ratchet 44 and the control disk 46 are released from the engagement with the pawl 55-1, respectively, the force of the motor,
The force of the clutch spring 48 starts rotation in the direction of arrow E. In this state, the ratchet 44 starts continuous rotation,
Even if the ratchet 46 is disengaged from the pawl 55-1 and is rotated by the angle J, the tip 56-
1 restrains the second ratchet 46-2 and suspends the temporary rotation. At this time, the control disc 46 operates by the angle J.
The clutch main part 49 is positioned by the print cam 15 hammer 16 which also serves as a detent and does not rotate. (Second
(Fig.) The outer circumference 46-5 of the ratchet 46 is formed slightly larger than the outer circumference of the ratchet 44.
Does not prevent the ratchet 44 from rotating. Further, if the control disk 46 rotates only by the angle J, the clutch pawl 47
Teeth 47-1 do not contact the clutch ratchet 45.
If the trigger coil 53 (Fig. 2) continues to be energized, this state is maintained, but the state is as shown in Fig. 5 (C) due to current interruption. In FIG. 5 (C), since the current of the trigger coil 53 is cut off, the operating lever 56 is returned in the direction of the arrow H by the operating lever spring 57. At this time, the selection claw 55 moves to the control disk 46.
The outer circumference 46-5 does not return in the direction of arrow H. When the tip 56-1 of the operating lever 56 is disengaged from the ratchet 46-2, the control disk 46 causes the clutch spring 48 (second
The force shown in the figure) rotates in the direction of arrow E by an angle K. At this time, the clutch pawl 47 also rotates and the teeth 47-of the clutch pawl 47-
1 enters the locus of the clutch ratchet 45, and the clutch ratchet 45 that is continuously rotating causes the clutch pawl 4 to move.
The clutch main portion 49 (FIG. 2) rotates in the direction of arrow E through the arrow 7. That is, the print cam 15 also rotates and drives the hammer 16. When the rotation further proceeds and the printing process is completed, the return cam 50 moves the claw 5 of the selection claw 55 as shown in FIG. 5 (D).
5-5 is contacted and the selection claw 55 is rotated in the direction of arrow H. Further, as shown in FIG. 5 (E), the claw 5 of the selection claw 55 is
The pawl 55-1 engages with and restrains the ratchet 46-2 of the control disk 46 before 5-2 releases the engagement with the selected ratchet 51. The clutch main part 49 includes a print cam 15, a hammer 16, and a hammer spring 60 (FIG. 2) that have completed the printing process.
The clutch main portion 49 and the control disk 46 are shifted by the angle K in FIG. 5 (C) because the hammer spring 60 urges them in the detent stroke.
The relative position of is returned to the initial state, the clutch pawl 47 and the clutch ratchet are disengaged, and then the state of FIG. 5 (A) is restored.

Next, FIG. 6 shows an example of a timing chart according to an embodiment of the present invention. (Refer to FIG. 1 1) T. P.R.
P. Are respectively the timing pulse and reset pulse of the type detector, and the type wheel group outputs 12 pulses per round. In the process of (a) in the figure, a character wheel that is two steps next to the digit direction is used to select and print a character that is 10 pulses backward in the direction of rotation, and two digits are shifted by energizing the digit shift trigger 5 twice. Then, the carriage carry is carried out by the stepper motor 21 and the print character is selected by turning on the selective print trigger 4 after 10 pulses and selected at the end of the digit shift or the carriage carry slower (digit shift in the example). Printing is performed by turning off the print trigger 4. In the figure (b)
In the process of T., the carry is started at the rising edge of the first timing pulse after the end of printing, and the print after 5 pulses can be selectively printed in the same type ring. P. In step 3, the selective print trigger is turned on, the energization is maintained until the carriage carry is completed, and it is turned off immediately after the carriage carry is completed to perform printing. That is, in the selected process, there is no unnecessary waiting time because the end of the process that takes the longest time is put in the printing process later, and high speed printing can be performed without adding a new trigger. Further, as shown by the broken line in the process of (a) in the figure, since the holding current can be reduced, low energy consumption can be achieved.

〔effect〕

As described above, according to the present invention, the first drive source, which is a motor mounted on the carriage, the first transmission means for transmitting the rotation of the first drive source to the type wheel, and the carriage are arranged on the carriage. A third transmission means for transmitting the driving force of the first drive source to the hammer that presses the type on the printing paper; a second transmission means for moving the type wheel in the print digit direction with respect to the hammer;
First switching means for switching transmission of power from the power source to either one of the first transmission means and the third transmission means,
It has a second switching means for connecting or disconnecting the power of the first transmission means to or from the second transmission means, and a second drive source for moving the carriage in the print digit direction. Two
Since the carriage is driven while the carriage is moving by the moving means, the first driving source mounted on the carriage drives the printing wheel, shifts the printing wheel, and prints, and the second driving source. By moving the carriage, you can start the process of selecting the type of characters to be printed during the movement of the carriage, so the selection process and the carry process or the return process for returning the carriage are driven at the same time. The printing speed has been increased.

In addition, the drive of the type wheel, the shift of the type wheel, the selection of the type wheel, and the printing means and the first drive source for driving them are mounted on the carriage, so that all the mechanisms mounted on the carriage can be driven on the carriage. Since it does not require a drive shaft for transmitting power to the carriage between the frames supporting the carriage, the structure around the carriage is extremely simple, and it is possible to reduce size, weight, consumption and cost. It has become possible. Especially when the number of digits increases, the drive shaft becomes longer in the past, and the effect is remarkable because there is no speed down due to load increase due to increase in shaft weight, increase in current consumption, shaft accuracy problem, etc. Become.

Furthermore, since the hammer and the printed characters are arranged on the carriage, the printer can be supplied with excellent printing quality because the hammer and the printed characters can be easily aligned with each other.

As described above, the practical effect of the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a plan view showing a schematic configuration of the present invention, FIGS. 2 to 4 are perspective views showing essential parts, FIG. 5 is a side view showing operation of essential parts, and FIG. 6 is an example of a timing chart. 1 …… Motor 10 …… Type wheel group 15 …… Printing cam 16 …… Hammer 21 …… Stepper motor 30 …… FPC 44 …… Internal gear ratchet 45 …… Clutch ratchet 46 …… Control disc 47 …… Clutch Claw 48 …… Clutch spring 50 …… Reset cam 55 …… Selection claw 56 …… Operating lever

Continuation of front page (56) Reference JP-A-57-47664 (JP, A) JP-A-57-25980 (JP, A) JP-A-60-232973 (JP, A) JP-A-57-129772 (JP , A) JP 57-169381 (JP, A) JP 56-11289 (JP, A) JP 60-104372 (JP, A)

Claims (1)

[Claims] 1. A carriage that moves in a direction orthogonal to a conveying direction of a printing paper, and a serial printer that arbitrarily selects and prints one of a plurality of type wheels on the carriage, the carriage being mounted on the carriage. A first drive source that is a motor; a first transmission means that transmits the rotation of the first drive source to the type wheel; and a hammer that is arranged on the carriage and presses the type letter onto the printing paper. Third for transmitting the driving force of the first driving source
Transmission means, second transmission means for moving the type wheel in the print digit direction with respect to the hammer, power from the first power source, the first transmission means and the third transmission means. A first switching means for switching the transmission to either one of the two, a second switching means for connecting or disconnecting the power of the first transmission means to the second transmission means, and moving the carriage in the print digit direction. And a second drive source for driving the carriage, wherein the first transmission unit and the second transmission unit are driven while the carriage is being moved by the moving unit.