JPS5833826B2 - printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a serial printer, and more particularly to a completely new serial printer that does not use electromagnets or the like.

An object of the present invention is to provide a new 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 9 lines and 99 column resets (and line feeds) 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, in which desired characters on the printing drum 2, which is constantly rotating, are...
When it comes near magnet 1, input a signal to electromagnet 4,
The trigger lever 3 is placed within the rotation locus of the waterwheel 5, and the rotational energy of the waterwheel is transmitted to the printer 1 via the pawl 51 to perform printing.

Furthermore, in the conventional type wheel selection type printer shown in FIG. After the engagement is released, 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 characters corresponding to the number of digits, and is equipped with electromagnets corresponding to the number of digits.

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.

Also, so-called dot printers, which form characters using dots, have been in high demand in recent years.

In the case of a dot printer, the number of dots equivalent to one digit is 5.
×7 or 7 × 9, and if the number of dots is made up of digits, it becomes very expensive, and generally seven dots arranged vertically,
Alternatively, a serial printer is used in which printing is performed by moving nine dots (generally referred to as a dot head) in the digit direction.

However, when characters are composed of dots, while it allows for a wide variety of characters, it has 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 as explanations of 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 binion 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), where a carry pulley and the like are arranged.

FIG. 5 is a side view of the first printing arm, and FIG. 6 is a side view of the second printing arm.

FIG. 7 is a sectional view taken along the line x-x' in FIG. 4.

FIG. 8 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 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 transmits this rotation to the clutch gear 18 via a driven gear 16 and a transmission 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 transmitted to the selection gear 2 via the transmission gears 20 and 21.
2, the clutch pawl 23 provided on the side of the selection gear 22 (the selection gear 22 is not fixed to the type wheel shaft 26) engages with the teeth of the ratchet gear 24 pivotally attached to the type wheel shaft 26. Engage, rotate this, and mark the outer periphery.

A first type wheel 27 on which symbols etc. are arranged and a second type wheel 28 on which numbers etc. are arranged on the outer periphery are rotated.

In the initial state, the type wheels 27 and 28 are located near the first frame 32, the mask spring 30 is pressed against the first frame 32, and the mask 29 is in standby so as to cover the second type wheel 28. There is.

The timing detection plate 3 synchronizes with the rotation of the type wheel 27°28.
4 is rotated to generate a timing signal and a reset signal corresponding to the type, and a timing detector 35 transmits the position of the type to an external control circuit (not shown).

When the external control circuit matches the desired character signal, this match signal completes character selection for the first digit and sends a command to reverse rotation (in the direction of arrow B) to the motor 13 to begin printing.

When the motor 13 starts to rotate in reverse, the clutch gear 18 also rotates in the direction of the arrow, and the clutch pawl 181 engages with the clutch groove 191 of the printing cam 19, and the printing cam 1
9 in the same direction (arrow direction).

To explain the state of the type wheels 27 and 28 at this time, as the clutch gear 18 rotates in the direction indicated by the arrow, the selection gear 22 also rotates in the same direction (in the positive direction of the arrow). The clutch pawl 23 slides on the teeth of the ratchet gear 24 and does not cause the ratchet gear 24 to rotate.

A selection pawl 25 attached to the first printing arm 36 serves as a positive positioner for the clutch gear 24.

Since the ratchet gear 24 provided coaxially with the type wheel shaft 26 does not rotate, the type wheels 27 and 28 continue in a stationary state in which a desired type is selected.

Returning to the explanation of the printing operation, when the printing cam 19 rotates in the direction of the arrow, this rotational movement is transferred to the cam groove 19 of the printing cam 19.
2 and the first printing arm 3 with the printing arm shaft 37 as the fulcrum by the action of the pin 361 provided on the first printing arm 36
6 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.

The first printing arm 36 and the second printing arm 39 are indicated by the arrow F.
When moving in the direction, the type wheel shaft 26 is pushed down, and the type wheels 27 and 28 are supplied with ink by the ink roll 31.
is pressed onto recording paper 101 (shown in FIG. 7) to perform printing.

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 the arrow and meshes with the pulley gear 42, causing the carry pulley 43 to rotate.
, wind up the wire 44, and type wheel 27.2
Carry 8 up by one digit.

The carry 9 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 from the second type ring 28 to the first type ring 2 by the force of the mask spring 30.
7, and subsequent printing operations are performed using the first type wheel 2.
Since 7 is covered by 11 and 9 is repeated, the first type ring with symbols etc. is not printed.

When the desired number of digits have been printed, a data end signal is generated from the control circuit, but the motor 13 continues in the forward direction (arrow A
direction) rotates, and in synchronization with this rotation, the type wheels 27, 28
A timing signal is generated by the rotation of the .

However, since no external print signal is generated, no matching signal with the timing signal is generated, and no selection is made.

Therefore, the type wheels 27, 28 continue to make 11 unselected revolutions.

As the type wheel shaft 26 rotates, the mechanical counter gear 46 rotates in the direction indicated by the arrow via the transmission gears 71 and 72.

The mechanical counter gear 46 has a groove 461 in a part thereof, and meshes with the teeth of the digit reset gear 52 to rotate the digit reset gear by one tooth.

When the mechanical counter gear 46 makes one more rotation, the 9-digit digit set gear 52 also rotates by l, but at this time, the digit reset cam 47 provided on the side of the digit reset gear 52 moves the digit reset arm 48 in the direction of the arrow H. Further, the digit reset arm 48 pushes the digit gear 41 in the direction of the arrow against the spring 73.

Therefore, the engagement between the carry gear 41 and the pulley gear 42 is released, and the carry pulley 4 is integrated with the pulley gear 42.
3 rapidly rotates in the direction of the arrow (■) by the force of the mainspring 49, returning the type wheels 27 and 28 to their initial positions.

The digit reset arm 48 is pushed in the direction of the arrow H to indicate 11, but when the next printing operation is performed, the printing arm 36
．． 39 is pushed down in the direction of arrow F, the printing arm 3
The mechanical counter gear 46 attached to 9 moves in the same manner, and the engagement between the digit reset gear 52 and the mechanical counter gear 46 is released.

A spring 74 is attached to a part of the digit reset gear 52, and the force of this spring causes the digit reset gear 52 to rotate and return to its initial state. The force moves in the direction of arrow N and waits for the next carry operation.

After completing the series of operations of selecting type, printing 9 digits, and resetting 9 digits, push the entire printer downward by hand, and rotate the line spacing index 55 by one tooth against the force of the spring 54 of the stopper 53. It is set to the same position as when the paper is fed (by one line).

This paper feed 9 operation maintains its pitch accurately by the frictional force between the tires 56 and the recording paper 101, generates a signal to the line spacing detector 57, informs the control circuit of the end of the operation, and starts printing the next line. .

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 by one digit, the paper feed pin 5 fixed to the carry pulley 43
8 moves in the direction of arrow J, the paper feed arm 59 is moved by the force of the spring 61 from the position indicated by the solid line in FIG. 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 as per 62 and remains stationary.

When the printing operation for one line is finished and the digits are reset,
The carry pulley 43 rapidly rotates in the direction of arrow ■ (shown in FIG. 4), the paper feed pin 58 collides with one end of the paper feed arm 59, and the paper feed ratchet 60 is rotated by one tooth, causing the entire printer to rotate by one tooth. Move by line.

As explained above, the present invention does not use any electromagnets, which have many uncertain elements, and all operations such as type selection, printing 2 digits, 2 digits, 9 sets, (paper feeding is also possible) are performed by the forward and reverse rotation of the motor. It 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 or the like, and a is a side view and b is a plan view.

In recent years, the calculator body 631ri 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 10 mm. There is enough space even if you incorporate it.

In this example, tires 56 are arranged at the four corners of the calculator main body 63, and by pushing down the calculator main body 63 by hand, two sheets of printing can be fed.

Further, FIG. 11 shows an application example in which a printer using the paper feeding mechanism shown in FIG. 9 is incorporated into the computer main body 63, and a paper cassette 102 containing recording paper 101 is attached below the computer main body 63. .

In FIG. 11, when the tire 56 rotates, the recording paper 101 held between the tire 56 and the table 69 is fed one line at a time.

In this case, the calculator main body 63 and the paper cassette 102 can be removed separately and carried around in a pocket or the like.

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 can leave records even when written on 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. FIG. 2 is a diagram illustrating a conventional printer using a type wheel selection method. FIG. 3 shows an embodiment of the printer of the present invention, and is an exploded perspective view of the first printing arm side. FIG. 4 shows an embodiment of the printer of the present invention, and is an exploded perspective view of the second printing arm side. FIG. 5 is a side view of FIG. 3. FIG. 6 is a side view of FIG. 4. FIG. 7 is a sectional view taken along line xx' in FIG. 4. FIG. 8 is a time chart for explaining the operation of the embodiment of the present invention shown in FIGS. 3 to 7. FIG. FIG. 9 shows another embodiment of the filter paper feeding mechanism used in the printer of the present invention. FIG. 10 shows an example of application of the printer of the present invention, and is a diagram showing a state in which the printer is incorporated into a calculator to print on a notebook or the like. FIG. 11 shows another application example of the printer of the present invention, in which the paper feeding mechanism shown in FIG. 9 is attached to the printer and incorporated into a calculator.
It is a figure which shows the state when a paper cassette is attached to the bottom of a calculator.

Claims (1)

[Claims] 1 In a Syrian print link that detects a desired character during continuous or intermittent rotation of the type wheel, performs a print operation, and then performs a carry operation, a mechanical counter that is reset by the printing operation and a mechanical counter that moves the type wheel by one digit. It has a carry means that moves the type wheel in the direction of the digits one by one, and a locking means that stops the type wheel moved by the carry means at each digit position, and the type wheel is moved several times in succession without performing a printing operation. The serial printer is characterized in that the mechanical counter releases the locking means and returns the type wheel to an initial position by rotating the type wheel.