JPH0127863B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for moving type, etc. in a parallel input type impact printer in the digit direction.

Conventional parallel input type impact printers are
Each digit has the required number of letters, and many have a common letter pattern for each digit. Also, between the digits,
A certain amount of clearance was necessary. Figures 1 and 2
This will be briefly explained using the conventional example shown in the figure.

FIG. 1 is a perspective view of a drum impact type, in which 1 is a drum body, 2 is a rotating shaft, 3 is a typeface, 4 is a mask, and 5 is a hammer. Printing is done on rotation axis 2.
At the same time, the drum body 1 and the type 3 rotate, and when the desired type 3 comes at the impact timing of the hammer 5, the hammer 5 is moved to print. At this time, the type 3 is inked with an ink roll or the like, and printing paper is interposed between the hammer 5 and the mask 4.

In the drum type impact type, in order to prevent the type 3 of other digits or the type 3 before and after the desired type 3 from coming into contact with the printing paper when the hammer 5 hits the printing paper, there is a gap between the digits. Mask 4 is always required.

FIG. 2 is a perspective view showing an impact type type wheel selection type printer. 6 is a printed character such as a number 9
8 is a rotary shaft that engages with the type ring 6 and rotates. 7 is type wheel 6
It is a type ratchet which is provided in a part of the printer and engages with a selection pawl 10 to stop the type at the printing position when the desired type 9 comes to the printing position. 11 is a selection claw axis, 1
2 is a type spring, and 13 is a printing roller. Type 9
is printed in the following order: The type wheel 6 rotates together with the rotating shaft 8 via the type spring 12.
When the desired type character 9 comes to a position opposite the printing roller 13, the selection pawl 10 is operated to engage the type character ratchet 7. The rotation shaft 8 and the type wheel 6 are disengaged,
Only the rotating shaft 8 continues to rotate and stops after rotating by a predetermined rotation angle. Next, the printing roller 13 press-prints the desired type 9 through the printing paper and the ink ribbon.

In the type wheel selection type printer, a member for locking the type wheel 6 is required between the type characters 9. In this example, they correspond to the type ratchet 7 and the selection claw 10.

Therefore, the pitch between the girders becomes wider, resulting in printed matter that is difficult to see.

An object of the present invention is to efficiently use printed characters by moving the printed characters corresponding to one digit from multiple digits in the digit direction, and to provide printed matter that is easy to see by narrowing the digit pitch. shall be.

A first embodiment of the present invention will be described using FIGS. 3 to 5.

Figure 3 is a perspective view, Figure 4 is a side sectional view, and Figure 5 is a side sectional view.
The figure shows a print sample, where 21 is typeface, 2
2 is a type wheel with type 21 arranged on its surface; 23 is a type wheel shaft that supports the type wheel 22; and 24 is supported by a part of the type wheel 22 and engaged with a groove on the outer periphery of the type wheel shaft 23 as necessary. 25 is a type selection pawl spring, 26 is a type wheel detent spring, 28 is an electromagnetic core that constitutes a magnetic circuit together with the suction lever 27;
29 is an electromagnetic coil, 30 is an electromagnetic coil terminal 3
1 and a wiring board that is soldered together. 32 is a suction lever 27 and a type selection pawl drive lever spring that engages with the type selection pawl 25; 33 is a suction lever 27;
34 is an ink roller, and 35 is a type wheel shaft 23.
36 is a part of the subframe, the electromagnetic core 28 is caulked and the electromagnet yoke part of the subframe engages with the suction lever 27, 37 is a cam part of the subframe, and 38 is a part of the subframe. The square hole part of the subframe, 39 is the ink roller presser spring, 40 is the flexible print cable,
Together with the cable holder 41, it is inserted into the wiring board 30 and connected by solder. 42 is a bearing, 43 is a swing spring, and 44 is a type gear that drives the type wheel shaft 23. The above 21 to 44 are subframe 3
All 5 are installed. This unit is called a subunit. Reference numeral 46 denotes a printing roller that press-prints the type 21, 47 a printing roller bearing that supports the printing roller 46, 48 a printing roller bearing drive shaft that drives the printing roller bearing 47, and a printing roller bearing drive shaft 48 attached to a frame 49. It is pivoted. 50 is a part of the frame, which is a frame bearing engaging part that engages with the bearing 42; 51 is a part of the frame, which is a frame protrusion that engages with the square hole part 38 of the subframe. Reference numeral 52 designates a part of the frame, in which the flexible printed cable 40 is sandwiched and attached to a frame cable attachment part, and 53 represents a swing drive cam that engages with the cam part 37 of the subframe to drive the subframe. 54 is a swing drive camshaft. 55 is a printing paper, and 56 is a printing paper feeding roller.

Next, the operation will be explained based on a printing example. If this printing cycle of one line is one cycle, printing of even digits in one cycle is finished in the first half cycle,
Next, odd digit printing is performed in the second half cycle. A half cycle consists of three steps: a type selection process, a printing process, and a type reset process. This process is common for even and odd digits. In addition to this, there is a movement process in which the subunit is moved from an even digit printing position to an odd digit printing position and from an odd digit printing position to an even digit printing position within one cycle.

In the type selection process, the type gear 44 is driven and the type wheel shaft 23 is also rotated in the direction of arrow A. When the groove on the outer periphery of the type wheel shaft 23 comes to the protrusion of the type selection pawl 24 that is synchronized with the desired type 21, a synchronized signal is generated, and the electromagnetic coil 29 is energized using the signal. Then, the attraction lever 27 forms a magnetic circuit with the electromagnet yoke portion 36 of the subframe and the electromagnet core 28, and is attracted to the electromagnet core 28. At the same time, the type selection pawl drive lever spring 32 also moves in the direction of arrow B and disengages from the type selection pawl 24. The type selection pawl 24 is rotated in the direction of arrow C by the force of the type selection pawl spring 25, engages with a groove on the outer periphery of the type wheel shaft 23, and rotates together with the type selection pawl 24. The type 21 on the outer periphery of the type wheel 22 also rotates at the same time, and when the desired type 21 reaches the printing position (the position on the center line between the type wheel shaft 23 and the printing roller bearing drive shaft 48), the type gear 44 and the type wheel shaft rotate. 23 and type 21 stop.

Next is the printing process. Print roller 45 is indicated by arrow D
Then, the selected type 21 is pressed and printed on the printing paper 55. At this time, type 2
1 is applied with ink by an ink roller 34.

Next is the reset process. The type gear 44 is driven again, and the type wheel shaft 23 rotates in the direction of arrow A. The type wheel 22 and the type selection pawl 24 together rotate the type wheel shaft 23 to a position where the type selection pawl drive lever spring 32 and the type selection pawl 24 engage. By the way, the electromagnetic coil 29 has already been de-energized, and the type selection pawl drive lever spring 32 can return to the original selection operation position by its own spring force.

Next, the moving process will be explained. The moving process is a pre-process in which the same type 21 is moved from the even digit printing position to the odd digit printing position after the even digit printing process is completed, and between the even digit reset process and the odd digit selection process. , and the opposite post-process. To explain the pre-process, in the even digit printing position, the subunit is moved so that the cam portion 37 of the subframe is aligned with the swing drive cam 5.
3 in the direction of arrow E by the spring force of two swing springs 43. Swing drive cam 53
supports the force in the direction of arrow E by the frame 49, and is rotatably attached to a swing drive camshaft 54 caulked to the frame 49. In the subunit, two bearings 42 are attached to a frame bearing engaging part 50, and a square hole part 38 of the subframe can slide on a frame protrusion 51 in a direction opposite to the direction of arrow E. is installed on. The swing drive cam 53 is designed to rotate once in one cycle, and during the printing process for even digits, the cam portion 37 of the subframe is only slid without moving in the forward and reverse directions of the arrow. Between the next reset process and the odd digit character selection process, the cam portion 37 of the subframe is pushed up and moved in the opposite direction to the direction of arrow E, thereby moving the type 21 to the odd digit printing position. At this time, all of the subunits move except for the bearing 42 attached to the frame 49. Bearing 42
The arrow E is attached to the frame 49 by the swing spring 43.
Bearing 4 is pressed in the opposite direction.
The type wheel shaft 23 slides on the second bearing portion in a direction opposite to the direction of arrow E. Also, the square hole part 38 of the subframe
The frame protrusion 51 also slides in the same manner. Therefore, the subunit is supported at three locations: two locations on the bearing 42 and one location on the frame protrusion 51.
And it slides. Further, the subsequent process moves in the direction of arrow E in the same manner. By the way, most of the parts of the subunit move in the same way as the cam part 37 of the subframe, but the bearing 42 described above
is immovable, and the swing spring 43 acts as a spring, and the operating length of the spring is shorter at the printing position of odd digits than at the printing position of even digits. Further, the flexible printed cable 40 moves in the same manner as the cam part 37 of the subframe at the cable presser 41, but does not move in the direction of the arrow at the frame cable attachment part 52. Therefore, there is free movement between them. The above is the explanation of the moving process.

A second embodiment of the present invention will be described with reference to FIGS. 6 to 8. FIG. 6 is a side sectional view, FIG. 7 is a perspective view, and FIG. 8 is a timing chart. 1
02 is a type ring with type 101 arranged around the outer periphery, 103
supports the type wheel 102, and has the type wheel shaft groove 1 on the outer periphery.
04, a type wheel shaft 105 is pivotally supported by a part of the type wheel 102, has a claw portion 106 that engages with the type wheel shaft groove portion 104, and further includes a spring hook portion 107, a first hook portion 108, and a second hook portion. This is a type selection claw having a section 109. 110 is a type selection pawl spring, and 111 is a type detent spring. 112 is an ink roller, 113 is an electromagnetic coil, 114 is a suction plate having a projection 115 that engages with the first hook 108 or the second hook 109, 116 is a suction plate return spring, and 117 is a suction plate return spring. The electromagnet yoke portion 118 of the subframe is an electromagnet core. 119 is a wiring board for soldering the electromagnetic coil terminal 120 attached to the electromagnetic coil 113; 121 is a flexible printed cable for wiring from the wiring board 119 to the printer control device; 122 is a cable holder; 123 is a square hole 124 of the subframe. , a subframe cam portion 125, and a subframe electromagnet yoke portion 117. 12
6 is a type gear, 127 is a bearing, 128 is a swing spring, and 129 is an ink roller presser spring. 10
1 to 129 constitute a subunit. Next, 130 is printing paper, 131 is a printing roller, 132 is a small printing roller, 133 is a printing roller bearing drive shaft,
134 is a printing roller bearing. The frame 135 that pivotally supports the printing roller bearing drive shaft 133 includes a frame bearing engaging portion 136 and a frame projection portion 137,
It has a frame cable attachment part 138, 139 is a swing drive camshaft caulked to the frame 135, and 140 is a swing drive cam. The above is the configuration.

Next, the operation will be explained. FIG. 8 is a timing chart showing a printing example, and the timing signal is generated from a detector (not shown) synchronized with the type wheel shaft groove 104 of the type wheel shaft 103.

The operation of one printing cycle will be explained separately, including a series of operations for selecting, printing, and resetting characters, and an operation for moving characters in the digit direction. First, a series of operations will be explained using the first and sixth digits of the printing example. The first digit is
In a printing example where a decimal point and a comma are not printed, the type wheel shaft 103 is moved by the arrow
The type wheel shaft groove 104 starts rotating in the A' direction and synchronizes with (empty 1), and the type wheel shaft groove 104 moves to the pawl part 106 of the type selection pawl 105.
When the electromagnetic coil 113 is energized, the principle of electromagnetism causes the suction plate 114 to move as shown in the arrow.
It is operated in the direction B' to disengage the protrusion 115 and the first hook 108. Next, when the engagement is released, the type selection pawl 105 is moved by the type selection pawl spring 1.
The claw part 1 moves in the direction of arrow C' due to the spring force of 10.
06 and the type wheel shaft groove 104 engage with each other. At the same time, the type wheel 102 starts rotating via the type selection pawl 105, and the (empty 1) type 101 is moved to the printing position (type wheel shaft 103 and print roller bearing drive shaft 13).
It is on the line connecting 3. ), the type wheel set 103 stops. At this time, the electromagnetic coil 11
3, energization has not been performed yet, and the suction plate 114 has returned to the position before energization by the spring force of the suction plate return spring 116. Accordingly, the protrusion 115 is located at the second position of the type selection claw 105.
The claw portion 106 and the type wheel shaft groove portion 104 are disengaged from each other. Next, the small printing roller 132 rotates in the direction of arrow D' (empty 1).
It passes above the printed characters 101.

Next, the type wheel shaft 103 rotates again, and when the type wheel shaft groove 104 synchronized with the type 101 in (4) comes to the position of the claw 106, the electromagnetic coil 11
3 is energized, and as before, the suction plate 11
The engagement between the protrusion 115 of 4 and the second hook 109 of the type selection claw 105 is disengaged, the type wheel 102 rotates, and when the type 101 of (4) comes to the printing position, the type wheel shaft 103 is rotated. Stop. Next, the printing roller 131 rotates around the printing roller bearing drive shaft 133, and presses and prints the printed characters 101 (4) on the printing paper 103. At this time, the ink roller 112 applies ink to the printing type 101 in (4) while the printing wheel 102 is rotating.
When the printing operation is completed, the type wheel shaft 103 rotates again and the suction plate 114 is also reset to its original standby position. To reset the type wheel 102, the protrusion 115 of the suction plate 114 and the first hook 108 of the type selection pawl 105 engage again as the type wheel shaft 103 rotates, and the type wheel shaft groove 104 and the type selection pawl 105 are re-engaged. The process ends when the engagement with the claw portion 106 is disengaged. The above is one print cycle of the first digit printing example.

Next, a printing operation for an example of printing a number with a comma in the sixth digit will be described. Most of the printing is the same as the first digit printing example, but it will be briefly explained.

The type wheel shaft 103 rotates in the direction of arrow A', (,)
When the type wheel shaft groove 104 synchronized with the type 101 comes to the position of the claw 106, the electromagnetic coil 113
is energized, the type wheel 102 starts rotating,
Stops when the printed characters (,) reach the printing position. Next, the small printing roller 132 is moved to the printing roller bearing drive shaft 1
33 as the center of rotation, printing paper 1
30, the printed characters 101 (,) are pressed.
Thereafter, when the small printing roller 132 separates from the type 101, the type wheel shaft 103 starts rotating again. At this time, the electromagnetic coil 113 is not energized, and the suction plate 114 is moved by the suction plate return spring 1.
16, the type selection pawl 105 rotates together with the type wheel shaft 103, and the protrusion 115 and the second hook 109 begin to engage. Upon further rotation, the type wheel shaft groove 104 and the claw portion 106 of the type selection pawl 105 disengage, and the type selection pawl 105 stops. Next, print the number ((1) in this example) in the same way as the first digit.

Next, the movement operation will be explained. The basic movement is exactly the same as the first embodiment. Timing different from the first embodiment will be explained using FIG. 8. In this second embodiment, the timing of movement is as follows from the printing position of ・and, etc. because it prints ・and, etc. at the beginning of one cycle and then prints numbers etc.
Move it in the direction of arrow E' to print numbers, etc. Therefore, it is divided into a process of moving from the end of the printing process to before the printing process of numbers, etc., and a process of moving from the end of the printing process of numbers, etc. to before the printing process of . The moving method is the same as that of the first embodiment, as described above, and will therefore be omitted.

As explained above, according to the present invention, the sub-frame equipped with the type wheel shaft that supports the type wheel and the electromagnetic member for selecting the type wheel is oscillatedly driven in the width direction of the recording paper by the oscillating drive member. Because of this structure, the digit pitch for printing can be freely selected, and a large number of characters can be printed in the same space. Furthermore, points and commas can be printed between printed digits, making it easier to see and displaying numerical values more accurately. Furthermore, since parts such as a type ring and selection claw are not required for each digit, a large cost reduction can be achieved. Furthermore, the sub-frame is equipped with a type selection mechanism such as a type wheel, selection pawl, and electromagnetic member and is swung, so the type selection operation is similar to a mechanism in which similar parts are arranged in all digits. It is stable and does not malfunction.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing conventional printers. Figure 1 is a drum type printer, 3 is a type printer,
4 is a type mask, FIG. 2 is a type wheel selection type printer, 9 is a type, and 10 is a selection claw. 3 to 8 are diagrams showing embodiments of the present invention. 3 to 5 are diagrams showing the first embodiment, in which FIG. 3 is a perspective view, FIG. 4 is a side sectional view, and FIG. 5 is a printed example. 21 is a type, 23 is a type wheel shaft, 35 is a subframe, 37 is a cam portion of the subframe, 38 is a square hole portion of the subframe, 42 is a bearing, 43 is a swing spring, 44 is a type gear, and 46 is a printing roller. , 49 is a frame, 50 is a frame bearing engaging portion, 51 is a frame protrusion, and 53 is a swing drive cam. 6 to 8 are views showing the second embodiment, in which FIG. 6 is a side sectional view, FIG. 7 is a perspective view, and FIG. 8 is a timing chart. 101 is a type, 103 is a type wheel, 105 is a first notch 108 for a comma and a decimal point,
123 is a subframe, 124 is a square hole in the subframe, 125 is a cam part in the subframe,
126 is a type gear, 127 is a bearing, 128 is a swing spring, 131 is a printing roller, 132 is a small printing roller, 135 is a frame, 136 is a frame bearing engagement part, 137 is a frame protrusion, and 140 is a swing drive cam. It is.

Claims (1)

[Scope of Claims] 1. In a type wheel selection type printer in which the type ring is swung in the width direction of recording paper in order to repeat printing between printed digits to form one line of print, type is arranged on the outer periphery. a type wheel shaft rotatably supporting a plurality of type wheels arranged along the width direction of the recording paper; a type selection means for selecting the type and stopping the type at a printing position; and a swinging means for swinging at least the type wheel shaft, the type wheel, and the type selection means in the width direction of the recording paper, and the type wheel rotates while the type wheel rotates once. Upper 2
one type each during a period in which the type wheel shaft, the type wheel, and the type selection means are swung in the first and second directions, and the printing means selects one type when the type wheel is in the first direction. printing a selected type each time it is swung in the first direction and a second direction, and between the type that is printed when it is swung in the first direction, the type that is printed when it is swung in the second direction; A type wheel selection type printer characterized by being configured so as to fill the type wheel with.