JPS5882774A - Printer - Google Patents

Abstract

PURPOSE:To obtain an inexpensive printer with a simplified mechanism by providing a reference positioning system for selecting printing types consisting of a step motor and a photo sensor for a serial printer using a type wheel. CONSTITUTION:A type wheel 31 is turned by the rotation of a step motor 36, and the type wheel is also solely vertically moved for printing by means of a flexible joint 34 and drive mechanisms 37-40. A shield plate 32 is attached to a motor shaft 36a at a right angle to the axis, and the position at which a photo sensor 33 is interrupted is defined as a home position. Also, upper and lower drive mechanisms are provided to the wheel shaft 35 of the type wheel 31. In short, one end of a lever 37 attached to the wheel shaft 35 is supported on a support shaft 38, and is driven up and down by a plunger magnet 40 and a recovery spring 39 on the other end.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a type selection method for serial printers, and more particularly to an improved type selection method suitable for small printers.

In recent years, serial printers have been widely developed and put into practical use as office machines such as terminals in various combinations and tabbing systems.

These printers use various printing methods such as a Hiro wire dot print head, a type type wheel, and a porous Gojin Jib wheel*.

The conventional method will be explained below using a serial printer using a type type wheel as an example. This will be explained with reference to J.

Figure 1 is a perspective view illustrating the outline of a serial printer, Figure 2 is a side view of the shift mechanism shown in Figure 1, and Figure 3 is! @ Figure 1 is a logic diagram showing the type wheel in Figure 1, and Figure 4 is a block diagram of the type selection control in Figure 1. In the figure, 1 is the type wheel, 2.2' is the arm 3, 3I
is the type, 5 is the printer, 6 is the platen, 7 is the feed screw gear, 9 is the stator 7)% 10 is the carrier, 11 is the googly, 12 is the belt, 13 is the space motor, 15 is the bracket, 16 is the four-tissue ■ motor, 17 is a flexible diode, 19 is a shift shaft, 20 is a shifter, 21#i plunger! Gunnet F, 22 is the center plate, 23 is the hammer magnet, 45 is the control circuit,
46 is a DC/AC converter, 47 is a comparison circuit, 48 is a phase compensation circuit, 49.51 is an amplifier, and 50 is a transducer.As shown in FIG. 1, the printer 5 has a cylindrical platen 6. In addition, a feed screw gear 7 is provided parallel to the platen 6. A carrier 10 that is slidably engaged and supported by a stay shaft 9 is screwed onto the screw gear 7, and a space motor 13 is connected to the screw gear 7 via a carrier 11, a heald 12, etc. is connected, rotate the motor 13 in forward and reverse directions as appropriate, and move the carrier 10 in the direction of arrow A.
, can be freely moved in direction B. A bracket 15 is provided on the carrier 10, and a rotary shaft motor 16 is fixed to the bracket 15. As shown in FIG. 2, a shift shaft 19 is connected to the shaft 16a of the motor 16, which is rotatably supported at one end of the shifter 20 via a flexible hinge 17. The end is connected to a plunger magnet 21 fixed to the carrier 10, and! By energizing and de-energizing the magnet 21, the shift shaft 19, and therefore the type wheel 1, can be moved in the direction of the arrow E%F in the figure, that is, in the vertical direction. A wheel mounting shaft 19a is formed on the shift shaft 19, and the type wheel 1 is fitted onto the shaft 19a through a hole 1a. As shown in FIG. 3, the type wheel 1 is composed of a center plate 22 in which approximately circular center plate elements 22m and 22b are superimposed, and a typeface 3.3/. Type wheel 1 with 128 printed characters (
(128 characters for Japan, 96 characters for Europe and America), the center plate element 22a has 96 arms 2 arranged radially.
2b has 32 arms 2' arranged radially. The arms 2 are four-ring arms 2m and 2a' each having one ring-shaped type 3 formed at the same pitch at the tip.
Similarly, the arm 2' is a nine-seat arm 2b having letters 3' formed in an annular shape at the same pitch at its tip, and a sheet arm 2b is provided for every three four-rings A.

On the other hand, as shown in FIG. 1, a hammer magnet 23 having a handle W-23B is fixed, and by energizing and de-energizing the hammer magnet 23, the hammer 23 is
M can be freely projected in the direction of arrows G and H in the figure, that is, in the direction of the platen 6. Therefore, by wrapping the printing paper 25 around the gage 2/6, the characters to be printed are placed on the inner circumference of the type wheel 1. In the case of a certain type 3', as shown in FIG. In the case of type 3 on the outer periphery of 1! The magnet 21 is de-energized and the wheel 1 is lowered in the F direction. Next, the rotary turning motor 16 is driven to rotate the wheel 1 in the C1D direction in the M1 diagram, and the hammer 2 of the hammer magnet 23 is rotated between the predetermined type 3 or 3' and the hammer 2 of the hammer magnet 23.
31 are aligned facing each other. When they are aligned and the hammer magnet 23 is excited at the 9th point, the handle 1-23m protrudes in the direction of the arrow G, the tips of the type 3 or Fi3/ and the W-23m come into contact, and the arm 2 or 2/ is elastically held. The printed characters 3 or 3' are pressed into contact with the printing paper 25 on the platen 6 through an ink ribbon or the like (not shown in the figure) in a deflecting manner,
Printing is performed @ When printing is completed, the magnet 23 is de-energized, the hammer 23a is moved back in the H direction, and the standby state is entered for the next printing operation, but the type 3 or 3' used for printing is also 2 or 2' returns to the initial position. In this way, the predetermined characters 3 in the type wheel 1 are selected one after another.
Or 3' is selected and printed, and the space motor 13
The printing operation is continued by driving the carrier 10 to appropriately move it in the directions of arrows A and B.

To explain the type selection control method in such a printer, as shown in FIG.
When it enters 6, the voltage corresponding to the printed code is output. The voltage is fed back through the amplifier 51, -
The difference between the voltage of the comparator circuit 47 (which is initially O)
, is generated between the phase compensation circuit 48. This voltage difference passes through the amplifier 49 and rotates the rotary motor 16.

At the same time, the transformer 50 directly connected to the rotation motor 16 rotates, causing the transformer 50 to rotate.
voltage changes. When the voltage difference becomes zero by the feedback loose circuit, the rotary printing motor 16 stops, and that position is the position of the selected character on the type wheel 1. In this manner, type selection is performed for each print code.

However, according to the conventional method described above, type selection can be performed reliably by checking each print, but the mechanism and control are complicated, and it is difficult to use a printer with a relatively small number of types of prints in a shed due to the structure and cost. The disadvantage was that it was inappropriate.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing type selection method having a simple structure and solving the above-mentioned drawbacks.

The present invention provides a printer comprising a platen member and a printing section including a type wheel facing the platen member with a gap therebetween, and printing on a medium set in the gap between the printing section and the platen member. Selection of printed characters on the print head is performed by rotation of a step motor.
- It is a printer device with characteristics. In this way, a printing type selection method with a particularly simple structure is obtained.

An embodiment of the present invention will be described below with reference to FIGS. 5 to 7. 5 is a perspective view showing an outline of an embodiment of the present invention, FIG. 6 is a perspective view showing the printing drive mechanism shown in FIG. 5, FIG. 87 is a type selection printing control plate shown in FIG. 5, 33 is a photosensor, 34
35 is a flexible jersey, 35 is a wheel shirt),
368! Step motor, 36a is motor shirt), 3
7U lever, 38 is a spindle, 39 is a recovery spring, 40 is a pusher magnet), 41 is a control 11 circuit, 42 is an amplifier,
43 and 44 indicate drivers. As shown in Figure s5, the wheel shaft 35 attached to the center of the type wheel 31 is flexible and connected to the motor shaft 368 of the step motor 36 arranged on the axis. Contacted by India 34. Therefore, the type wheel 31 is rotated by the rotation of the step motor 36, and the type wheel 31 can be independently moved up and down for printing by the flexible jet 34 and the drive mechanism described later. There is. A shield plate 32 is attached to the motor shaft 36a at right angles to the axis, and as the step motor 36 rotates, the shield plate 32 rotates in a plane perpendicular to the axis. A photoreceptor 433 is arranged parallel to the motor shaft 36a, sandwiching the shielding plate 32. The wheel shaft 35 of the type wheel 31 is provided with upper and lower barrels as shown in FIG.

That is, when attached to the wheel shaft 35, one end of a nine lever 37 is supported by a support shaft 38, and a plunger magnet 40 and a recovery spring 39 are attached to the other end in opposite directions.

The type wheel 31 is constructed by attaching 20 types 31a made of porous rubber to the outer periphery of a synthetic resin disc. The printed characters 31a are soaked with ink.

This device has such a configuration! When selecting type, first, the home position is determined using the photo sensor 33 before printing, and at this time a predetermined step 36 is performed.
It is assumed that the signal of the photosensor 33 is extracted only during the excitation phase. If the Kmm plate 32 is already shielding the photosensor 33, rotate the step Tanabata 36 until the shielding plate 32 is removed from the photosensor 33, and then turn it in a predetermined direction (for example, clockwise p) until the photosensor is removed. 33 detects a signal change caused by the shielding plate 32, that position is set as the home position. Then, when the printing hood is input, the step motor 36 rotates by a predetermined number of pulses corresponding to the characters to be printed at this position and then stops. It stopped.

-, i activates the plunger magnet 40 of the vertical drive mechanism of the wheel shaft 35 shown in FIG. 6, moves in the direction of arrow J in the figure, and prints K on the print medium 25a shown by the two-dot chain line in FIG. can do. If the operation of the plunger magnet 40 is released immediately after printing, the recovery spring 39 causes the type wheel 31 to leave the surface of the print medium 251 and return in the direction of the arrow, thus making it ready for the next type selection. Then, when the next print code is output, it rotates by the difference between the current stop position and the predetermined number of pulses for the next print, stops, and activates the plunger magnet 40 to print. K like this
Then, when printing of one predetermined block (for example, one line) is completed, the type 31g of the type wheel 31 is returned to the home position, and the photo sensor 33 moves to the shielding plate 32. The printing operation for one block is completed by detecting a signal change and confirming that the shielding plate 32 does not shield the photosensor 33 in the state of the same excitation phase immediately before the home position, and then printing for the next block is completed. The printer enters a standby state for printing the four-dimensional image. In this way, cumulative errors in one block printing can be detected and erased. 7th
As shown in the figure, the control in the above-mentioned type selection is carried out first when the photo sensor 33 detects a signal change due to the shielding plate 32, and the signal passes through the amplifier 42 to the control circuit w! 41, a signal from \ causes the driver 43 to stop the step motor 36 at the home position. Next, when the print code is input to the control circuit 41, the control circuit 41 sends a predetermined number of pulses to the printed characters 31a to the driver 4.3 and the step motor 36.
Rotate by the number of pulses. After the control circuit 41 sends a predetermined number of pulses, it sends a signal to the driver 44 to activate the feed reduction plunger magnet 40 to perform printing.

As described above, according to the present invention, type can be selected by rotating the step Tanabata, so the mechanism is extremely simple and costs are reduced. Since the photo sensor signal is extracted only when driving a specific excitation phase of the Maku Steg motor, the position accuracy does not depend on the accuracy of the photo sensor signal, making adjustment difficult. It has the effect of being able to be used in

[Brief explanation of the drawing]

Fig. 1 is a perspective view illustrating the outline of a serial printer, Fig. 2 is a side view of the shift mechanism shown in Fig. 1, Fig. 3 is a plan view showing the type wheel shown in Fig. 1, and Fig. 4 is a plan view illustrating the type wheel shown in Fig. 1. Block diagram of type selection control for jl! 5 is a perspective view showing an outline of an embodiment of the present invention, FIG. 6 is a perspective view showing the printing drive mechanism shown in FIG. 5, and FIG. 7 is a block diagram of type selection printing control shown in FIG. 5. In the figure, 25a is a printing medium, 31 is a type wheel, 31a is a type, 32 is a shielding plate, 33 is a photo center t, 3
4 is the engine, 35 is the wheel shaft, 36 is the step motor, 37 is the lever, 40 is the plunger magnet,
41 is a control circuit, 42 is an amplifier, and 43 and 44 are drivers. 1 Figure 13 Figure 4 419- Figure 6 7121

Claims (1)

[Claims] The type is composed of a platen member, and a printing part including a type wheel around which printed characters are formed and impregnated with ink, and which faces the platen member with a gap therebetween, or is set in a gap between the printing part and the platen member. What is claimed is: 1. A printer device for printing on a printed medium, characterized in that the desired printing type is selected.