JPS6045597B2 - serial printer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a serial printer.
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An object of the present invention is to provide a novel ultra-compact serial printer that does not use coils such as electromagnets and has fewer components.

Another object of the present invention is to provide a novel serial printer in which character selection, printing, shifting, and shifting (and line advancing) are performed by a single motor.

A conventional printer will be explained using FIGS. 1 and 2.

Figure 1 shows a flying type printer using a printing drum. When the desired type on the constantly rotating printing drum 2 comes near the hammer 1, a signal is input to the electromagnet 4, and the trigger lever 3 is depressed. The hammer 1 is placed within the rotation locus of the wheel 5, and the rotational energy of the ratchet wheel is transmitted to the hammer 1 via the pawl 51 to perform printing. Furthermore, in the conventional type wheel selection type printer shown in FIG. 2, a signal is input to the electromagnet 9 when a desired type on the type wheel 7 comes near the platen 6.
The engagement J between the trigger bar 8 and the selection pawl 11 is disengaged, and the selection pawl 11 is locked to the ratchet 12 by the spring force of the selection spring 10. When each digit completes the same operation, the platen 6 presses onto the aligned desired characters to perform printing. The conventional printer described above has a number of printed characters corresponding to the number of digits, and is also equipped with electromagnets corresponding to the number of digits, so that the overall size of the device and the power consumption are unavoidable.

Furthermore, when electromagnets or the like are used, there are many uncertainties due to the influence of magnetism, and there remain problems in terms of reliability, such as adverse effects on electromagnets in adjacent girders. Furthermore, the demand for so-called dot printers, which form characters using dots, has increased in recent years.

In the case of a dot printer, the number of dots equivalent to one digit is 5.
x 7 or 7 x 9, and it becomes very expensive to configure dots for the number of digits, and generally seven dots lined up vertically,
Alternatively, a serial printer is used that performs printing by moving nine dots (generally referred to as a dot head) in the column direction. But if you want to make up a character with dots,
Although it could accommodate many types of characters, it had the disadvantage of being difficult to read. The present invention obviates the above-mentioned drawbacks and provides a printer that can be incorporated into particularly small pocket-sized calculators.

Furthermore, the present invention can provide a printer that can freely print on notebooks and the like other than limited printing paper such as roll paper. The present invention will be explained in detail with reference to examples.

3 to 11 are prepared to explain embodiments and application examples for effectively utilizing the features of the present invention.

FIG. 3 shows one embodiment of the printer of the present invention, and is an exploded perspective view of the side where the motor pinion is arranged (referred to as the first printing arm side in this embodiment).

FIG. 4 is an exploded perspective view of the opposite side of FIG. 3 (referred to as the second printing arm side in this embodiment), and a pulley, etc. is arranged on the girder. FIG. 5 is a side view of the first printing arm,
FIG. 6 is a side view of the second printing arm. FIG. 7 is a sectional view taken along line 5-X'' in FIG. 4. FIG.
7 is a time chart for explaining the operation of the embodiment of the present invention shown in FIGS. 3 to 7. FIG. The operation of the embodiment will be explained below.

First, the printer of the present invention starts with the rotation of the motor 13 in the forward direction (in the direction of arrow A).

When motor 13 rotates in the direction of arrow A, motor shaft 1
A motor pinion 15 pivotally attached to the clutch gear 15 rotates in the same direction, and this rotation is transmitted to the clutch gear 18 via a driven gear 16 and an electric gear 17. This clutch gear 18 has a clutch pawl 181 on its side surface, and is designed not to engage with a clutch groove 191 provided on the side surface of the printing cam 19 when the motor 13 rotates in the A direction. Furthermore, this rotation is caused by transmission gear 2
0 and 21, the selection gear 22 rotates in the direction of arrow C (the selection gear 22 is not fixed to the type wheel shaft 26), and the clutch pawl 23 provided on the side of the selection gear 22 is fixed to the type wheel shaft 26. It engages with the teeth of the ratchet gear wheel 24 and rotates it, thereby rotating a first type ring 27 on which signs, symbols, etc. are arranged on the outer periphery, and a second type ring 28, on which numbers and the like are arranged on the outer periphery. In the initial state, the type wheels 27 and 28 are located near the first frame 32 and the mask spring 30
is pressed against the nineteenth frame 32, and the mask 29 is on standby so as to cover the second type ring 28. Type wheel 27
, 28, the timing detection plate 34 is rotated, a timing signal and a reset signal corresponding to the printed characters are generated, and the timing detector 35 transmits the position of the printed characters to an external control circuit (not shown). ing. When the external control circuit matches the desired print signal, this match signal causes the first
When character selection for the digits is completed, a command for reverse rotation (in the direction of arrow B) is sent to the motor 13 and printing operation begins. When the motor 13 starts rotating in reverse, the clutch gear 18
The clutch pawl 181 rotates in the direction of arrow D, and the clutch pawl 181
9 and rotates the printing cam 19 in the same direction (direction of arrow D). Type wheel 27 at this time,
To explain the states of 28 and 28, as the clutch gear 18 rotates in the direction of arrow D, the selection gear 22 also rotates in the same direction (in the direction of arrow E), but the clutch pawl 23 provided on the side surface of the selection gear 22 rotates as a ratchet gear. 24 and does not rotate the ratchet gear 24. The first printing arm 3 acts as a reliable positioner for the ratchet gear 24.
This is the selection claw 25 attached to 6. Since the ratchet gear 24 provided coaxially with the type wheel shaft 26 does not rotate, the type wheels 27 and 28 remain stationary with the desired type selected. Returning to the explanation of printing operation, printing cam 1
9 rotates in the direction of arrow D, this rotational movement is caused by the action of the cam groove 192 of the printing cam 19 and the pin 361 provided on the first printing arm 36 to rotate the first printing arm 36 with the printing arm shaft 37 as a fulcrum. Convert to reciprocating motion (arrows F, G). The first printing arm 36 is connected to a second printing arm 39 provided on the second frame 33 side via a connecting shaft 38, and operates in the same manner. First printing arm 36
When the second printing arm 39 moves in the direction of arrow F, it pushes down the type wheel shaft 26 and moves the type wheels 27 and 28 supplied with ink by the ink roll 31 onto the recording paper 101 (the seventh
(as shown in the figure). When the printing operation is completed and the motor 13 continues to rotate, the carry gear 41 rotatably attached to the camshaft 40 rotates in the direction of arrow D, meshes with the pulley gear 42, and rotates the carry pulley 43. The wire 44 is wound up and the type wheels 27 and 28 are moved up by one digit.

The carry detector 45 reliably detects the carry operation, which detects the contact piece 193 provided on the outer periphery of the printing cam 19, sends a signal to an external control circuit, and completes the carry. The motor 13 rotates in the forward direction (direction of arrow A) again in response to the carry end signal, and repeats the above rotation. In this carried state, the mask 29 is moved by the mask spring 30.
The second type wheel 28 moves to cover the first type ring 27 due to the force of , and since the subsequent printing operation is repeated while covering the first type ring 27, the first type ring 28 has symbols etc. does not print. When the desired number of digits have been printed, a data end signal is generated from the control circuit, and the printing wheels 27, 28
Even if the timing signal is generated by the rotation, no match signal is generated because no external print signal is generated, and no selection is made.

Therefore, the type wheels 27 and 28 idle, and when the mechanical counter gear 46 rotates twice, the digit reset gear 52 rotates, the digit reset cam 47 pushes the digit reset arm 48 in the direction of arrow H, and the digit feed gear 41 and pulley The first gear 42 is disengaged. The released pulley gear 42 is the mainspring 4
With the force 9, the carry pulley 43 is rapidly rotated in the direction of arrow 1, and the type wheels 27 and 28 are returned to their initial positions. The initial position of the type wheels 27 and 28 is between the digit reset pin 50 and the degree 5.
It is maintained accurately by the action of 1. After completing the above series of operations such as character selection, printing, carrying, and digit resetting, push the entire printer downward with your hand, and the stopper 5
The position is the same as when the line spacing index 55 is rotated against the force of the spring 54 of No. 3 to feed the paper by one tooth (one line).

The pitch of this paper feeding operation is maintained accurately by the frictional force between the tires 56 and the recording paper 101, and the line spacing detector 57 generates a signal to inform the control circuit of the end of the operation, and printing of the next line begins. A more suitable paper feeding mechanism for completing all operations by forward and reverse rotation of the motor of the present invention is shown in FIG. In FIG. 9, the printing mechanism is the same as the above-mentioned mechanism, and its explanation will be omitted. When the carry pulley 43 winds up the wire 44 even by one digit, the paper feed pin 58 fixed to the carry pulley 43 moves in the direction of arrow J, so that the paper feed arm 59 is moved by the force of the spring 61. Move from the position indicated by the solid line in Figure 9 to the position indicated by the two-dot chain line. Thereafter, even if a carry operation is performed, the paper feed arm 59 does not move due to the percussion 62 and remains stationary. When the printing operation for one line is completed and the digits are reset, the carry pulley 43 rapidly rotates in the direction of arrow 1 (shown in FIG. 4), and the paper feed pin 58 is moved to one end of the paper feed arm 59. Collision, paper feed ratchet 60
Rotate by one tooth and the entire fritter will move by one digit. As explained above, the present invention does not use any electromagnets, which have many uncertain elements, and uses the forward and reverse rotation of the motor to select type, print, and
It can perform all the operations of carrying up and resetting digits (paper feeding is also possible), can be miniaturized, and has a very wide range of applications.

Examples of its application will be described below with reference to FIGS. 10 and 11.

FIG. 10 is a diagram showing a state in which the printer of the present invention is incorporated into a calculator and printed on a notebook, etc., in which a is a side view and b is a plan view. In recent years, the calculator main body 63 has become extremely thin, and even if it includes the keyboard 64, control unit 65, battery 67, etc., it is possible to create a calculator with a thickness of about 1 mm.
There is enough space under the display section 66 even if the aforementioned printer is incorporated therein. In this example, tires 56 are arranged at the four corners of the calculator main body 63, and printing and paper feeding are possible by pushing down the calculator main body 63 by hand. Furthermore, a printer using the paper feeding mechanism shown in FIG. 9 is incorporated into the calculator main body 63,
FIG. 11 shows an application example in which a vapor cassette 102 containing a recording paper 101 is attached under the calculator main body 63. In FIG. 11, when the tire 56 rotates, the table 6
The recording paper 101, which is sandwiched between the recording paper 9 and the recording paper 9, is fed one line at a time. In this case, the calculator main body 63 and the vapor cassette 1
You can also take out the 02 separately and carry it around in your pocket. As is clear from the above description, the printer of the present invention can be incorporated into a small-sized calculator without increasing its size, and it is possible to leave records even in a hand-held calculator.

Further, since the printer of the present invention performs all operations only by rotating the motor in forward and reverse directions, power consumption is extremely low and reliable operation can be provided.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional printer, which is a flying type printer.

Claims (1)

[Claims] 1. A serial printer that sequentially prints by moving a type wheel in the digit direction, comprising a motor that can rotate in forward and reverse directions, and a first and second motor that rotates only when the motor rotates in a certain direction. a printing wheel that selectively covers one of the printing wheels; a printing arm that supports the printing wheel and is selectively swung; the printing arm rotates only when the motor rotates in the opposite direction; a printing cam that converts the motion into a swinging motion of the printing arm to press one of the printing wheels to print on the recording paper surface; A carry pulley moves the type wheel up by a desired pitch, and in response to the rotation of the motor in a certain direction, the type wheel is moved to its initial position by continuously rotating the type wheel carried up a plurality of times. A serial printer consisting of a digit reset cam and a digit reset cam. ”