JPS60232984A - Printer - Google Patents

Abstract

PURPOSE:To contrive enhancement of printing speed and reduction in the weight and cost of a printer, by reducing the number of fixing and unfixing means such as solenoids which are provided. CONSTITUTION:Four movable plates 4a-4d disposed in a vertical direction on the front side of armatures 3a-3d are provided respectively with connecting recessed parts 40, whereby the first armature 3a is connected to the first movable plate 4a, the second armature 3b is connected to the second movable plate 4b, the third armature 3c is connected to the third movable plate 4c, and the fourth armature 3d is connected to the fourth movable plate 4d. Each of the moving plates 4 is provided with tooth parts 41 on the side opposed to a selecting plate group 5, the number of the tooth parts 41 being equal to the number of the selecting plates 5a-5n, namely, the number of digit places. A pawl part 29a of the first selecting plate 12 is opposed to the tooth parts 41 of the first movable plate 4a, a pawl part 29b of the second selecting plate 13 is opposed to the tooth parts 41 of the second movable plate 4b, a pawl part 29c of the third selecting plate 14 is opposed to the tooth parts 41 of the third movable plate 4c, and a pawl part 29d of the fourth selecting plate 15 is opposed to the tooth parts 41 of the fourth movable plate 4d.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a printer, and particularly to a printer in which a plurality of type shafts are arranged side by side in the digit direction.

[Background of the invention]

In conventional printers with multiple type shafts arranged side by side in the digit direction, an electromagnetic solenoid was installed for each type shaft. During one rotation of the type shaft, the type selection for each type shaft is made, and in synchronization with this, the electromagnetic solenoid attached to the type shaft is energized, and based on this, the ratchet mechanism is operated, and the rotational force of the type wheel - Holds the position in the direction. In this way, after all digits, that is, all type axes, are selected, the platen roller is pressed against the selected type area via the ink ribbon and printing paper to print on the paper, and after printing, the reset lever is pressed. It rotates to reset the ratchet mechanism.

In the case of a printer having this configuration, for example, an 18-digit printer, it is necessary to arrange 18 electromagnetic solenoids. Therefore, when printing the same typeface (symbol) over all digits, 18 electromagnetic solenoids must be energized at once, which not only extremely increases power consumption but also causes malfunctions. Furthermore, since 18 electromagnetic solenoids are installed, the entire printer becomes larger and heavier. Furthermore, the number of commonly used electromagnetic solenoids is about 100.
It has a relatively high resistance value of ~300Ω, and due to space considerations, a thin coil was used as the excitation coil, and in particular, as mentioned above, all electromagnetic solenoids were energized at the same time. In some cases, the operation becomes slow and it becomes difficult to increase the speed.

[Purpose of the invention]

Book! The purpose of f:@ is to eliminate such drawbacks of the conventional technology and to provide a printer that is capable of increasing speed and is highly reliable.

[Embodiments of the invention]

Next, embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a schematic configuration diagram of the printer viewed from above.

On the frame 1 are four electromagnetic solenoids 2a.

2b, 2c, 2d are arranged side by side, and four moving plates 4θ, 4b are placed on the armatures 3a, 3b, 3c+3d side.
, 4c, and 4d are arranged in the vertical direction, and each movable plate 4
8 to 4d are individually movable in their longitudinal direction.

Selection plate groups 5a to 5n are rotatably installed near the movable plates 4a to 4d, and the number of selection plates installed corresponds to the maximum number of digits of the printer. Driving wheels 68 to 6n and type shafts 78 to 7n are arranged near each selection plate group 5a to 5n.
7n faces the platen roller 10 via the ink ribbon 8 and printing paper 9. The drive wheels 68~
6n and the number of type shafts 78 to 7n installed also match the maximum number of digits of the printer.

The details will be explained later, but the electromagnetic solenoid 2° moving plate 4
2 selection board group 5. Through the cooperation of the drive transport 6 and the type wheel 7, type is selected from the type shafts 78 to 7n sequentially from the lower digit side, and then the platen roller 10 is moved to the type shafts 78 to 7n via the ink ribbon 8 and printing paper 9. It is designed to print one line at a time by pressing the button.

Next, the type selection mechanism will be explained. FIG. 2 is a partially exploded perspective view of the type selection mechanism. As shown in the figure, the selection board group 5 is made up of a trigger board 11, a first selection board 12, a second selection board 13, a third selection board 14, and a fourth selection board 15. It is configured. The trigger plate 11 is molded from synthetic resin, and includes a first selection plate 124 and selection plates 12 to 1.
5 is made of an elastic metal plate.

As shown in FIG. 3, the trigger plate 11 has a through hole 16 in the center.
A boss portion 17 is provided which protrudes from one side (the back side in the figure). A trigger protrusion 18, an arcuate groove 19. An arc-shaped selection plate return groove 20 and a one-step stopper portion 21 are provided, respectively.

As shown in FIG. 2 and FIGS. 4 to 7, the first to fourth selection plates 12 to 15 have a slightly fan-shaped outer shape, and engagement holes 22a to 22d are formed in the center thereof. They are respectively provided with holes and are rotatably fitted onto the boss portion 17 of the trigger plate 11.

Elastic arms 23a to 23d are projected from each of the selection plates 12 to 15 along the rotating direction of the selection plates 12 to 15, and the tip of the elastic arm 23 is folded back as shown in FIG.
9 is formed. Elastic arm 23a of first selection plate 12
is located at the outermost radial direction than the other selection plates 13 to 15, and the second selection plate 13, the third selection plate 14, and the fourth selection plate 1
No. 5: As the position of the elastic arm 23 increases, the position of the elastic arm 23 becomes closer to the inside in the radial direction.

The first selection plate to the fourth selection plate 12 to 15 have engaging holes 22a to
Cut-out pieces 24a to 24d protruding in the same direction are formed at positions approximately the same distance away from 22d. Further, in the first selection plate 123 and selection plates 12 to 14, arc-shaped tolerance grooves 25 are provided on approximately the same circumference as the cut and raised pieces 24a to 24c.
a to 25c are formed.

The fourth selection plate 15 is provided with a spring hook portion 26 by cutting and bending at a position radially outward from the cut and raised piece 24d thereof, and an arcuate tooth portion 27 is further formed at a position radially outward from the spring hook portion 26. ing. One end of a tension spring 28 is engaged with the spring hook 26, so that the fourth selection plate 15 is always elastically biased in the direction of arrow A in FIG.

The first selection board to the fourth selection board 12 to the trigger board 11
15 are stacked one on top of the other in order and are supported by the boss portion 17, and the cut and raised piece 24a of the first selection plate 12 is movably inserted into the arc shape $19 of the trigger plate 11. Also the second
The cut-and-raised piece 24b of the selection plate 13 is connected to the allowable groove 2 of the first selection plate 12.
5a, the cut and raised piece 24e of the third selection plate 14 is attached to the second selection plate 1.
The cut and raised pieces 24d of the fourth selection plate 15 are movably inserted into the allowance grooves 25b of No. 3 and the allowance grooves 25c of the third selection plate 14, respectively.

The length of the dish-shaped groove 19 is such that it allows the first selection plate 12 to be rotated by the amount of rotation corresponding to eight characters by the type wheel 7. The length of the allowable groove 25a of the first selection plate 12 is such that the second selection plate 13 is allowed to rotate by the amount of rotation corresponding to four characters on the type shaft 7. The length of the allowable groove 25b of the second selection plate 13 is such that the third selection plate 14 is
The length is such that it allows rotation by the amount of rotation equivalent to a character. Furthermore, the length of the allowable groove 25c of the third selection plate 14 is
The length is such that the fourth selection plate 15 can be rotated by the amount of rotation corresponding to one character on the type shaft 7.

Further, the claw portion 29a of the elastic arm 23a on the first selection plate 12 engages with the claw lock 830a of the trigger plate 11, and the claw portion 29b of the elastic arm 23b on the second selection plate 13 engages with the claw of the first selection plate 12. The claw portion 29c of the elastic arm 23c on the third selection plate 14 engages with the locking edge 30b.
The claw portion 29d of the elastic arm 23d of the fourth selection plate 15 engages with the claw locking edge 30d of the third selection plate 14. Each of the selection plate groups 58 to 5n made of a polymer of the trigger plate 11, the first selection plate 124, and the selection plates 12 to 15 is rotatably supported on the selection shaft 31, as shown in FIG.

FIG. 9 is a diagram for explaining the type selection mechanism, and as shown in the figure, a type shaft 32 is installed above and parallel to the selection shaft 31. The arcuate teeth 27 of the fourth selection plate 15 are rotatably supported on the type wheels 7a to 7n.
A gear 33 that meshes with is integrally formed on each side surface,
Further, a desired type portion 34 is provided on the outer periphery of the type ring 7.

The platen roller 10 is supported by a roller shaft 36 together with a side plate 35, and is pressed against the type portion 34 only during printing.

Further, as shown in the figure, a drive shaft 37 is disposed diagonally below the selection shaft 31 in parallel, and the drive wheels 6a to 6n are attached so as to rotate together.

A trigger protrusion 1 of a trigger plate 11 is provided on the outer periphery of the drive wheel 6.
One drive pawl 38 is provided for engaging with 8.

Four amateurs 38 as shown in Figures 2 and 9
3d is rotatably supported by a support shaft 40 hanging from the support plate 39. The four movable plates 48 to 4d arranged in the vertical direction in front of the armatures 38 to 3d are each provided with a connecting M portion 40, whereby the first armature 3a is connected to the first movable plate 4a and the second armature 3b.
is connected to the second moving plate 4b, the third armature 3c is connected to the third moving plate 4C, and the fourth armature 3d is connected to the fourth moving plate 4d.The side of each moving plate 4 facing the selection plate group 5 There is a selection board group 58
The same number of teeth 41 as ~5n, that is, the same number of digits, are provided. As shown in FIG.
The claw portion 29b of the selection plate 13 contacts the tooth portion 41 of the second moving plate 4b, the claw portion 29c of the first selection plate 12 contacts the tooth portion 41 of the third moving plate 4c, and the claw 29d of the fourth selection plate 15 contacts the tooth portion 41 of the second moving plate 4b. The tooth portions 41 of the four moving plates 4d are opposed to each other.

As described above, the fourth selection plate 15 is pulled in the direction of arrow A as shown in FIG. 2 by the tension spring 28. The claw portion 29d of the fourth selection plate 15 comes into contact with the claw lock #30d on the third selection plate 14, and transmits the biasing force of the fourth selection plate 15 to the third selection plate 14.

Further, the claw portion 29c of the third selection plate 14 comes into contact with the claw latch II#30c on the second selection plate 13, and transmits the biasing force of the third selection plate 14 to the second selection plate 13. Further, the claw portion 29b of the second selection plate 13 is engaged with the first selection plate 12.
It comes into contact with the opening edge of 30b and transmits the biasing force of the second selection plate 13 to the first selection plate 12. Furthermore, the first selection board 1
The second claw portion 29a is located at the claw locking edge 30 on the trigger plate 11.
a, the biasing force of the first selection plate 12 is applied to the trigger plate 1.
1. And due to this bias in the direction of arrow A,
The first step part 2 of the stopper of the trigger plate 11 is in the state before type selection.
1 comes into contact with the upper surface of the support plate 39, and the standby positions of the trigger plate 11, the first selection plate 124 and the selection plates 12 to 15 are secured. In this way, each selection plate group 58 to 5n is arranged in an orderly manner at the standby position by the support plate 39, and in this state, the trigger protrusion 18 of each trigger 4Jill rotates along the rotational trajectory of the drive pawl 38 on each drive shaft 68 to 6n. It's within.

When selecting type, the drive shaft 6 is rotated in the direction of the arrow as shown in FIG. 2 by the driving force of a motor (not shown), and its drive pawl 38 engages with the trigger protrusion 18 of the trigger plate 11. The trigger plate 11 is rotated in the direction opposite to the direction of arrow A.

The drive wheels 6 are mounted at equal intervals along the axial direction of the drive shaft shaft 37 by the maximum number of digits so as to form a pair with the selection plate group 5,
Further, as shown in FIG. 10, the drive pawls 38 formed on each drive wheel 6 are provided at positions shifted by a predetermined interval along the circumferential direction, and correspond to the lowest digit during one rotation of the drive shaft 37. The drive shaft 6 contacts the trigger plates 11a to lln at predetermined timings in order from the drive shaft 6 toward the upper digits. Further, as shown in FIG. 2, a digit position detection sensor 42 made of, for example, a reflective photosensor is attached on one coaxial axis of the drive shaft 37.

And the drive shaft 6 and trigger @11 corresponding to the digit position
A pulse signal is output from the digit position detection sensor 42 shortly before the digit position is engaged, and based on the signal, the electromagnetic solenoids 28 to 2d are activated in response to the character to be printed at the digit position.
Any or all of them are energized, and the energized state is maintained for a predetermined short time.

A little after the electromagnetic solenoid 2 is energized, the drive pawl 38 of the drive shaft 6 corresponding to the digit position engages with the trigger protrusion 18 of the trigger plate 11, and the rotational force of the drive shaft shaft 37 causes the tension spring 28 to become elastic. The trigger plate 11 is rotated in the opposite direction of the arrow A.

With this rotation, the first selection plate 124 and the selection plates 12 to 15 also rotate in the same direction, and the first selection plate 124 rotates in the same direction as shown in FIG.
The claw portion 29a of the second selection plate 13 engages with the tooth portion 41 of the moving plate 4a, the claw portion 29b of the second selection plate 13 engages with the tooth portion 41 of the movement plate 4b, and the claw portion 29c of the third selection plate 14 moves. Teeth 41 of plate 4C
The claw portion 29d of the fourth selection plate 15 further moves F.
It will engage with the tooth portion 41 of i4d.

Next, a specific example of type selection will be explained. When rotating the type shaft 7 at the reference position before print selection by the amount equivalent to one character, immediately after the pulse signal (type selection start signal) is output from the digit position detection sensor 42, the fourth electromagnetic solenoid 2d is rotated. energized and thereby amateur 3d
is magnetically attracted and fixes the moving plate 4d in a predetermined position.

Note that the other first to third electromagnetic solenoids 28
~2C is not energized, so moving plates 4a~4c
is movable in its longitudinal direction.

In this state, the drive pawl 38 of the drive wheel 6 corresponding to the digit position
engages with the trigger protrusion 18 of the trigger plate 11, rotates the entire selection plate group 5 corresponding to the digit position in the opposite direction of arrow A, and the claws 29a-29d of each selection plate 12-15
tI-Movement 4Iii4 a - Bring it into contact with the teeth 4I of 4d.

As mentioned above, the movable plate 4d is fixed so as not to move, and FIGS. ).

The figure (A) shows the state before the claw portion 29d comes into contact with the tooth portion 41, and as the selection plate group 5 rotates, the claw portion 29d engages with the claw locking edge 3 tl d of the third selection plate 14. Mama's claw part 29
d approaches the inclined side 41a of the tooth portion 41. The figure (B) shows an initial state in which the claw portion 29t is in contact with the inclined side 4Ja of the tooth portion 41, and as the selection plate group 5 rotates, the claw portion 29d moves toward the tooth portion as shown by the arrow. Approach the 41 side and click the claw part 2.
By sliding contact 9d along the inclined side 41a,
The elastic arm 23d begins to bend outward. The same figure (C) shows the state where the claw part 29d is closest to the tooth part 41, and as the selection plate group 5 rotates, the claw part 29d reaches the root part of the inclined side 41a, and thereby Elastic arm 23
d is the most bent and the claw locking edge 30 of the adjacent third selection plate 14
The engagement with d is released.

FIGS. 12(A) to 12(C) are diagrams showing the situation when the claw portion 29a of the first selection plate 12 comes into contact with the tooth portion 41 of the movable plate 4a. FIG. 2A shows the state before the claw portion 29a comes into contact with the tooth portion 41.

As the selection plate group 5 rotates, the claw portion 29a, which remains engaged with the claw locking edge 30a of the trigger plate 11, approaches the inclined side 41a of the tooth portion 41. In the same figure (B), the claw part 29a is the tooth part 41.
This shows the initial state in which the claw portion 29a is in contact with the inclined side 41a, and as the selection plate group 5 rotates, the claw portion 29a approaches the tooth portion 41 side as shown by the arrow and slides along the inclined side 41a. Along with that.

Since the movable plate 4a is in a movable state, the claw portion 2
As the object 9a approaches, the moving plate 4a moves to the left toward the page as shown by the arrow. The same figure (C) shows the state where the claw part 29a is closest to the tooth part 41, and even if the claw part 29a reaches the base of the inclined side 41a, the moving plate 4a escapes, so the claw part 29a is It remains engaged with the pawl locking edge 30a.

The claw portion 29b of the second selection plate 13 and the third selection plate 14
Similarly to the claw portion 29a of the first selection plate 12, the claw portion 29c of the first selection plate 12 does not disengage from the claw lock 830 even when the selection plate group 5 rotates, and the movable plate 4 moves to the left. It just gets pushed away.

Therefore, the trigger plate 11, the first selection plate 12, and the second selection plate 1
3 and the third selection plate 14 are connected by the engagement of the claw portions 29a to 29c and the claw locking edges 30a to 30c, respectively, so that after the engagement between the drive shaft 6 and the trigger plate 11 is broken, the trigger The plate 11 and the first selection plate 123 and the selection plates 12 to 14 are returned to the standby position by the tension spring 28. On the other hand, since the fourth selection plate 15 is disengaged from the third selection plate 14, the tension spring 28 causes the third selection plate 1 to move against the trigger @11.
4 by the length of the allowable groove 25c in the direction of arrow A, thereby rotating the type shaft 7 by an amount corresponding to one character relative to the initial stage.

When rotating the type shaft 7 by an amount corresponding to one character, the third
Only the third electromagnetic solenoid 2C is energized to fix only the movable plate 4c, and the engagement between the second selection plate 13 and the third selection plate 14 is released, and the third selection plate 14 and the fourth selection plate 15 are are returned together with the trigger plate 11 by the length of the allowable groove 25b of the second selection plate 13, thereby rotating the type wheel 7 by an amount corresponding to one character.

When rotating the type shaft 7 by an amount equivalent to seven characters, the electromagnetic solenoids 2b, 2e, and 2d are energized to rotate the movable plate 4b +
Fix 4 c + 4 d. As a result, the second selection plate 13 is disengaged from the first selection plate 12 and returned by the length of the allowable groove 25a. Further, the third selection plate 14 is disengaged from the second selection plate 13 and returned by the length of the allowable groove 25b. Further, the fourth selection plate 15 is disengaged from the third selection plate 14 and returned by the length of the allowable groove 25c.

As a result, the fourth and final selection plate 15 rotates by the total length of the allowable grooves 25a, 25b, and 25c with respect to the trigger plate 11, thereby rotating the type shaft 7 by an amount corresponding to seven characters. The position of the fourth selection plate 15 at this time is shown in FIG. 9 by a two-dot chain line.

FIG. 13 is an explanatory diagram showing the relationship between the amount of movement of the type part 34 on the type shaft 7 and the energization and de-energization of each electromagnetic solenoid SQL, 2a to 2d. Electromagnetic solenoid S Q in the diagram
Among the tanks L 2 a to 2d, those shown with diagonal lines indicate energized electromagnetic solenoids, and those with blank spaces indicate non-energized electromagnetic solenoids.

As is clear from this figure, 16 types of type can be selected by combining the energization and de-energization of the four electromagnetic solenoids, and only when the type wheel 7 is moved by an amount equivalent to 15 characters.
By exciting the two electromagnetic solenoids 28 to 2d,
For other type selections, fewer electromagnetic solenoids are required to be energized.

As soon as the type selection for one digit position is completed in this way, the power to the electromagnetic solenoid 2 is cut off, and with the subsequent rotation of the drive shaft 37, a type selection start signal for the next digit is sent from the digit position detection sensor 42. Similarly to the above, a predetermined electromagnetic solenoid 2 is energized based on the type selection signal, and type selection is performed by the cooperation of the trigger plate 6 corresponding to the first-order upper digit and the selection plate group 5. In addition, each type wheel 78-7
n can be freely rotated individually on the type shaft 32, so the type shaft 7 where the type is selected sequentially from the lowest digit to the highest digit is in the approaching position regardless of the type selected on the adjacent type shaft 7. Retained.

After the desired character selection is made for each column, the printing of that line is done all at once. That is, after the selected type portion 34 is placed on the side facing the ink ribbon 8, the roller holder 43, which rotatably holds the platen roller 10, is rotated clockwise as shown in FIG. According to
Printing is performed by pressing the printing paper 9 and the ink ribbon 8 against the type portion 34 using the elasticity of the platen roller 10.

After the - digits have been printed all at once in this manner, the paper is fed by a paper feed mechanism (not shown) and the selection plates 12 to 15 are returned to their original positions.The operation will be described with reference to FIG. 14.

When one line has been printed, there is a selection board 12 for each digit.
- 15 are in different positions, and in some cases the claw portion 29 remains disengaged from the claw lock 1/#30 of the adjacent selection plate. Therefore, by rotating the return member 44 shown in the figure, the selection plates 12 to 15 of all selection plate groups 5a to 5n are returned to the engaged state. This return member 44 is engaged with and supported by the selection shaft 31,
A return bar 46 having a length of one line is attached to the tip of the arm 45 thereof. When the return member 44 is in a standby state, it stops when its return bar 46 abuts against the support plate 39, as shown by the solid line in FIG. During the return operation, by rotating the selection shaft 31 clockwise, the return member 44 also rotates in the direction of arrow A (see Fig. 2) due to the elastic bias of the tension spring 28.
The return bar 46, which pushes back the selection plate that had been rotated in the clockwise direction, moves back to the trigger plate 11 as shown by the broken line in FIG.
The rotation stops when it comes into contact with the bottom of the selection plate return groove 20 of 1. At the : position, the pawls 29 of all selection plates engage with the adjacent pawl locking edges 30 to prepare for character selection in the next row.

FIG. 15 is a timing chart of this printer from character selection to paper feeding operation.

As shown in the figure, the drive shaft shaft 37 rotates once at a constant speed based on a character selection signal from a control section (not shown), and during this period, a digit position detection sensor 42 sends a digit position detection sensor 42 at a predetermined timing.
pulse signals are sequentially output.

Based on the first pulse signal, the electromagnetic solenoid 2 is energized according to the type of character to be printed on the lowest digit.
& The selection plate group 5 corresponding to the lower digit rotates by engagement with the drive shaft 6 corresponding to the lower digit, and the type is selected via the fourth selection plate 15 based on whether each movable plate 4 is fixed or not fixed. The shaft 7 is rotated by the desired amount. Incidentally, when the rotation of the selection plate group 5 to move to the lowest digit is completed, the next second pulse signal is output, and eventually the type wheel 7 is rotated using the force of the tension spring 28. When it is, the next upper digit character selection operation has started. When characters are selected up to the most significant digit (18 digits in this example) in parallel with these operations, the platen roller 10 rotates to print one digit at a time, and then the return member 44 moves the selection plate The return operations 12 to 15 are performed, and at the same time, the paper feed operation is performed.

In the case of the above embodiment, the iron piece of the armature 3 is placed near the electromagnetic solenoid 2, and by energizing the electromagnetic solenoid 2, the iron piece of the armature 3 is attracted by the magnetic attraction force (by rotating the armature 3) and fixed. are doing. However, in this case, it takes time to rotate the amateur 3, and the selection of type is delayed accordingly. As shown in FIG. 16, a helical spring 47 with weak spring elasticity is attached,
By doing so, if the armature 3 is always held in the suction position (fixed position), the armature 3 is fixed at the same time as the electromagnetic solenoid 2 is energized, and the time can be shortened by one hour.

Note that the elasticity of the helical spring 47 is such that when the electromagnetic solenoid 2 is not energized, the movable plate 4 easily moves when the claw portion 29 of the first selection plate abuts the tooth portion 41 of the movable plate 4. It needs to be as light as possible.

FIG. 17 is an enlarged side view of essential parts showing a modification of the moving plates 4a to 4d. In this example, the horizontal 11 dimensions of the movable plate 4 are gradually lengthened from the first movable plate 4a to the fourth movable plate 4d, and the positions of the teeth 41 are actively sequentially changed as shown in the figure. It's shifted.

In this way, all the movable plates 48 to 4d are fixed,
When the selection plate group 5 is rotated by the drive shaft 6, the innermost claw part 2
The engagement is sequentially disengaged from 9d toward the outer claw portion 29a. This means that the side biased by the elastic biasing means such as the tension spring 28 is definitely disengaged, and the amount of rotation of the fourth selection plate 15 meshing with the type shaft 7 gradually increases. The structure is as follows.

As shown in FIG. 9, in a structure in which the width dimensions of the movable plates 48 to 4d are the same and the claw portions 29a to 29d of each selection plate 12 to 15 are arranged in a straight line, due to variations in component dimensions or mounting positions, etc. Claw portions 29a on each selection board 12 to 15
29d tends to come off at random times, and as a result, the fourth selection plate 15 may not rotate smoothly. In this respect, by employing the above-mentioned configuration, the fourth selection plate 15 can be rotated reliably and smoothly.

Although the width dimensions of the movable plates 4a to 4d are different in the above modification, the present invention is not limited to this.
For example, by changing the dimensions of the teeth 41 of the movable plates 4a to 4d or the lengths of the elastic arms 23a to 23d of the selection plates 12 to 15, the key is to adjust the timing at which the claws 29 come off from the elastic biasing side first. It doesn't matter if the structure allows it to be removed.

FIG. 18 is an enlarged side view of a main part showing a modification of the elastic biasing means in the fourth selection plate 15.

In this example, the selection plate 15 is provided with an elastic contact member 48 made of, for example, a plate spring or a wire spring, which is elastic on the surface of the first selection shaft 31 . At least when it is necessary to apply an elastic urging force to the selection plate 15, the selection shaft 31 is rotated in the direction of the arrow, and the selection plate 15 is moved in a predetermined direction by the frictional force generated between the first selection shaft 31 and the elastic contact member 48. It can also be elastically biased.

In addition to this example, it is also possible to interpose a spring clutch between the folded plate 15 and the selection shaft 31, and use the elastic force of the spring clutch to bias the selection plate 15 in one direction. .

[Summary of the invention]

As described above, the present invention includes a type shaft having a large number of type parts and teeth for rotation, and rotatably arranged in parallel in the row direction in the same number as the maximum number of digits.

A trigger plate provided with a toggle protrusion, an arcuate groove, and a pawl locking portion, an elastic arm having a pawl portion at the tip, a first selection plate provided with an arcuate groove, a protrusion, and a pawl locking portion, and a pawl at the tip. a second selection plate provided with a circular arc groove and a tooth portion that meshes with the tooth portion of the type shaft, the trigger plate being arranged such that the trigger plate and the second selection plate are on the outside , the first selection plate and the second selection plate are overlapped, the protrusion of the first selection plate is inserted into the arcuate groove of the trigger plate, and the claw part of the first selection plate is engaged with the claw of the trigger plate. engage the stop portion, insert the protrusion of the second selection plate into the arcuate groove of the first selection plate, and engage the claw portion of the second selection plate with the claw locking portion of the first selection plate. Seshime.

A group of selection plates arranged in parallel so that they can rotate in the row direction by the same number of digits as the maximum number of digits.

a rotational biasing means for rotationally biasing the second selection plate in a direction in which a claw portion of the second selection plate is disengaged from a claw locking portion of an adjacent selection plate; .

a driving means that engages with a trigger protrusion of a trigger plate to rotationally bias the selection plate group in a direction opposite to the biasing direction of the rotational biasing means; and a tooth portion facing the selection plate group, respectively. Established.

At least a first movable plate that the claw portion of the first selection plate abuts and a second movable plate that the claw portion of the second selection plate abuts, and these movable plates may be individually fixed or movable. The invention is characterized in that it includes fixing and non-fixing means.

〔Effect of the invention〕

By adopting the configuration described in 2, it is possible to reduce the number and cost of installing fixed and non-fixed means such as electromagnetic solenoids.
It is possible to increase the speed, reduce weight, and reduce costs of the printer.

[Brief explanation of the drawing]

The figures are all for explaining the printer according to the embodiment of the present invention, and FIG. 1 is a schematic diagram of the printer viewed from above, FIG. 2 is a partially exploded perspective view of the type selection mechanism, and FIG. A side view of the trigger plate, Figure 4 is a side view of the first selection plate, and Figure 5 is a side view of the trigger plate.
The figure is a side view of the second selection plate, Figure 6 is a side view of the third selection plate, Figure 7 is a side view of the fourth selection plate, Figure 8 is a partially enlarged view of the elastic arm, and Figure 9 is a side view of the third selection plate. An enlarged side view of the main part to explain the type selection mechanism, FIG. 10 is a side view showing the mounting state of the drive shaft, and FIGS. 11 (A), (B), and (C) are the claws for the fixed movable plate. FIG. FIGS. 12(A), (B), and (c) are explanatory diagrams showing the contact state of the claw portion with the movable moving plate, and FIG. 13 is the amount of movement of the type portion of the type shaft and the excitation of each electromagnetic solenoid, An explanatory diagram showing the relationship with de-energization, Fig. 14 is an enlarged side view of the main part to explain the return operation of the selection board, Fig. 15 is a timing chart from the type selection to paper feeding operation of this printer, Fig. Fig. 16 is a plan view of the main part showing another example of the electromagnetic solenoid, Fig. 17 is an enlarged side view of the main part showing a modification of the moving plate, and Fig. 18 is a plan view of the main part showing another example of the electromagnetic solenoid.
The figure is an enlarged side view of a main part showing a modification of the elastic biasing means in the selection plate. 2.2a-2d... Electromagnetic solenoid, 3,3a
-~3d...Amateur, 4,4a~4d...
...Moving plate, 6, 6a to 6n...Drive shaft, 7
, 7a-7n...Type shaft, 11...Mountain trigger plate, 12...First selection board, 13...Second selection board, 14......No. 3 selection board, 15...
Fourth selection plate, 18...Trigger protrusion. 19... Arc-shaped groove, 23.23a to 23d...
・Elastic arm, 24 , 24 a - 24 d -- Cut and raised piece, 25° 25 a ~ 25 c ... Allowance groove, 27 ・
...Arc-shaped tooth portion, 28...Tension spring, 29.
29a-29d...Claw portion, 30.30a-30
d...Claw locking edge, 33...Gear, 34...
・・・・Type part, 38・Old・・Drive claw, 41・・・・
... Teeth, 47... Spiral spring, 48...
...Elastic contact member. Figure 7 Figure 3 Demon Figure 11 (A) (B) (C) Figure 12 (A) (B) (C) Figure 13 Figure 14 I"

Claims (1)

[Scope of Claims] A type shaft having a large number of type parts and teeth for rotation, and arranged in parallel in the row direction for the same number as the maximum number of digits, a circular arc groove of one toggle protrusion, and A trigger plate with a claw locking part and an elastic arm with a claw at the tip. A first selection plate provided with an arcuate groove, a protruding piece, and a pawl locking portion, and a second selection plate provided with an elastic arm Ax having a pawl portion at the tip, an arcuate groove, and a tooth portion that meshes with the tooth portion of the type shaft. the trigger plate, the first selection plate, and the second selection plate are overlapped so that the trigger plate and the second selection plate are on the outside, and the projecting piece of the first selection plate is Insert it into the arc groove of the trigger plate, engage the claw part of the first selection plate with the claw locking part of the trigger plate, and insert the protrusion of the second selection plate into the arc groove of the first selection plate. , a group of selection plates arranged in parallel so as to be rotatable in the row direction by the same number as the maximum number of digits, with the pawl portion of the second selection plate being engaged with the pawl locking portion of the first selection plate; a rotational biasing means for rotationally biasing the second selection plate in a direction in which the claw portion of the second selection plate is disengaged from the claw locking portion of the adjacent selection plate; a driving means that engages with a trigger protrusion of the plate to rotationally bias the selection plate group in a direction opposite to the biasing direction of the rotational biasing means; a first movable plate that is abutted by the claw portion of at least the first selection plate and a second movable plate that is abutted by the claw portion of the second selection plate, each having a tooth portion facing the selection plate group; , A printer characterized in that it is equipped with fixing and non-fixing means for individually fixing these movable plates and making them movable.