JPH07276733A - Small printer - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a print-type serial printer that is capable of emphasizing printing and combination printing. [Structure] A pawl 35a of a paper feed clutch pawl 35 rotatably arranged on a shaft 38b of the paper feed drive gear is engaged with a groove 37a corresponding to the type of a paper feed clutch pawl wheel 37, and the paper feed drive gear is It is rotated and fed. [Effect] With an extremely simple paper feed clutch mechanism, it is possible to print one line by the reciprocation of the printing means a plurality of times, and it is possible to perform emphasized printing for printing the same character overlaid or combined printing for overprinting different characters. A print serial printer with rich expressive power can be provided at low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a type serial printer which has a type wheel made of an elastic material such as rubber and which prints by moving a printing means in the digit direction, and more particularly to a paper feed mechanism thereof. Most of this type of printers are installed in electronic desktop calculators.

[0002]

2. Description of the Related Art Conventionally, this type of paper feeding mechanism is disclosed in Japanese Patent Publication No. 3-2.
A device having a paper feed clutch claw 35 and a paper feed clutch claw wheel 37a as shown in FIG. 3 of 0352 has been known.

[0003]

However, in the above-mentioned prior art, when the most significant digit is selected, the printing, paper feeding, and carriage return operations are successively executed, so that one line is reciprocated by the printing means once. I could only print. Therefore, the expressiveness of the characters that can be printed only as the characters prepared as the print characters is poor.

The present invention has been made in order to solve such a drawback, and an object of the present invention is to provide a print type serial printer which is capable of highlighting printing and combination printing and which is rich in expressiveness.

[0005]

SUMMARY OF THE INVENTION A small printer of the present invention comprises a type member having a plurality of type characters arranged around it, which is driven to rotate by a type wheel shaft, and a type member selected as a type member is printed on a recording paper. A carriage that is equipped with a printing unit that moves in a direction perpendicular to the recording paper conveyance direction, a carry unit that carries the carriage in the printing line direction, a release unit that returns the carriage to the home position, and a recording paper transfer In the first energization mode of the paper feeding means and the trigger means, the printing means and the carry means are driven, and the second means of the trigger means.
In a small-sized printer in which the releasing means and the paper feeding means are driven in the energized state, the paper feeding drive gear for transmitting the driving force to the paper feeding means, the clutch pawl rotatably held by the paper feeding drive gear, and the type A clutch pawl wheel that is rotated corresponding to the member and has an engaging portion for engaging with a clutch pawl, wherein the engaging portion of the clutch pawl wheel corresponds to a predetermined type of the type member. .

[0006]

According to the above-mentioned structure of the present invention, one line can be printed by the reciprocating of the printing means a plurality of times, and therefore, the same character is overprinted and the combined printing is performed in which different characters are overlaid. You can

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic plan view showing an embodiment of the present invention, in which unnecessary portions are omitted in order to make the contents of the present invention easy to understand. FIG. 2 is a side view of a selection mechanism showing an embodiment of the present invention, and FIG. 3 is a side view of a paper feeding / carriage returning mechanism showing an embodiment of the present invention. FIG. 4 is a perspective view of a selection / paper feed / carriage return mechanism showing an embodiment of the present invention. FIG. 6 is a side sectional view of a printing mechanism showing one embodiment of the present invention, and FIGS. 8 to 10 are plan sectional views of the printing mechanism showing one embodiment of the present invention.

The outline of each mechanism will be described below.

(1) Selection mechanism Motor 6 fixed to frame 5, motor gear 7 fixed to motor shaft 6a, gear 8 meshing with motor gear 7
a, a shaft portion 8b that supports the selective drive gear 9, a planetary gear 10
A reduction gear 8 including a sun gear 8c that meshes with a selection drive gear 9 that is a shaft 9b that supports a planetary gear 10, and a selection gear 21.
It has a gear 9c that meshes with. The print switching cam 11 is an internal gear 11a that meshes with the planetary gear 10, a cam 11c that has a notch 11b on the outer periphery that engages with the claw 12a of the selection claw 12 (FIG. 2) that is a locking member, and a switching member. A cam 11f, which is a control member that engages with the return lever 13 (FIG. 3) 13a, and a print gear 15 fixed to the print shaft 14.
And a gear 11g that meshes with one body. Reduction gear 8,
The print switching cam 11 includes a shaft 17 fixed to the frame 5.
It is supported by. The sun gear 8c, the planetary gear 10, the internal gear 11a, and the selective drive gear 9 constitute an operating mechanism that is a conversion mechanism by the planetary gear. The selection claw 12 is supported by a shaft 19 which is mounted between the frames 5 and 18 and is spring 40.
Is urged in the direction of arrow B. The selection gear 21 has teeth 21b that mesh with the selection drive gear 9 and the pawl 1 of the selection pawl 12.
2a has teeth 21a regularly arranged on the outer periphery that engage with 2c, and a substantially U-shaped trigger yoke (not shown) is press-fitted inside, and a type shaft 22 is installed between the frames 5 and 18
Is stuck to. The trigger lever 23 is 12 of the selection claw 12.
It has a portion 23b that engages with the portion d, a portion 23c that engages with the portion 13b of the return lever 13, and a pin 23d that holds the trigger plate 27 made of a magnetic material. The pin 23d is supported by the type shaft 22 and attached in the direction of arrow C by the spring 25. It is energized.

The trigger yoke press-fitted into the selection gear 21 is made of a magnetic material and has an opening facing the trigger plate 27 and a coil 29 arranged inside. The trigger mechanism is composed of a trigger yoke, a trigger plate 27, and a coil 29.

The selection mechanism is composed of the above elements.

(2) Paper feed / carriage return mechanism The return lever 13 (FIG. 3) is the cam 11f of the print switching cam.
13a part to be engaged with, the 13b part to be engaged with the 23c part of the trigger lever 23, the projection 13c (FIG. 5) for engaging with the projection 41b of the positioning plate 41, the end surface cam part 1 of the print gear 15.
13d portion abutting on 5a, 35 of paper feed clutch pawl 35
It is composed of a b portion and a 13e portion which abuts, and is supported by a shaft 19 and is urged by a spring 20 (FIG. 4) in the arrow D direction and the counter arrow G direction. The paper feed clutch pawl 35 is the paper feed drive gear 3
8 is mounted on a shaft 38b provided on the paper feeding drive gear 3
8 is urged in the direction of arrow F by a spring (not shown) fixed to 8, and in the standby state, the stopper portion 35b portion returns to the return lever 13
13e of the above. The paper feed clutch pawl wheel 37 has a groove 37a for engaging with the teeth 35a of the paper feed clutch pawl 35 and a holding portion 37b for restricting the operation of the paper feed clutch pawl 35 on the outer periphery and is fixed to the type shaft 22. ing. In this embodiment, two grooves 37a of the paper feed clutch claw wheel are provided at positions corresponding to a specific type.

The paper feed gear 47 (FIG. 1) is a paper feed rubber 49.
It has a shaft portion 47a and a tooth portion 47b for fixing. Tooth 47b
Engages with the paper feed transmission gear 39 supported by the shaft 66 (FIG. 4) fixed to the frame 5. Positioning plate 41 is shaft 1
It has a plurality of teeth 41a which are supported by the shaft 9 and mesh with the carry cam 57b of the print cam 57, and are biased by the spring 20 in the direction of arrow Q (FIG. 11).

A paper feed and carriage return mechanism is constituted by the above elements.

(3) Printing Mechanism A print character belt 50 having a print character 50a on the outer periphery and a protruding portion 50b on the inner side of the print character 50a, a print character belt 51 having print characters 51a and a protruding portion 51b, and a print character belt 52 having a print character 52a and a protruding portion 52b. Is attached to a type holder 53 that is slidably attached to the type shaft 22 and is not rotatable. The type holder 53 has a cylindrical shape, and the type belts 50, 51, and
Holes are provided so that the protruding portions 50b, 51b, 52b of 52 are loosely fitted. Type belts 50, 5
Reference numerals 1 and 52 are elastic bodies made of rubber or the like. The character holder 53 is held by the carriage 54 so as to be movable by a certain amount, and is biased in the direction opposite to the arrow H by a character spring 65. The carriage 54 is guided by the type shaft 22 and the print shaft 14 and is movable in the arrow H direction. The hammer 55 is supported by a shaft 54a provided on the carriage 54 and is biased in the direction of arrow I by a spring (not shown), and is rotated in the direction of arrow I by a print cam lead 57a of a print cam 57 via a transmission lever 58. . The print cam 57 is sandwiched between 54b and 54c portions of the carriage 54, and is non-rotatably and slidably mounted on the print shaft 14. Further, the other end 55b portion is arranged so as to engage with the protruding portion 50b or 51b, 52b of the type belt 50, 51, 52. Further, the teeth 41 a of the positioning plate 41 are provided on the outer periphery of the print cam 57.
One carry cam 57b that meshes with is provided.

The printing mechanism is composed of the above elements.

Next, a series of operations will be described in detail.

(1) Initial setting Initial setting is performed before selecting and printing. The carry cam 57b of the print cam 57 and the positioning plate 4 are formed by a method described later.
The tooth 41a of No. 1 is disengaged (two-dot chain line in FIG. 11), one end is attached to the 54f portion of the carriage 54, and the other end is attached to the spring hook 18a provided on the end face of the frame 18 so that the carriage is attached in the opposite arrow H direction. By the urging return spring 63, the carriage is moved in the direction opposite to the arrow H so that the 54g portion of the carriage 54 is brought into contact with the end surface of the frame 18 (FIG. 8). At this time, the 53a portion of the character holder 53 also abuts on the end surface of the frame 18, and is moved in the carriage 54 by the character spring 65 to move the hammer 55.
55b of the above stops at a position corresponding to the type belt 50. The selection claw 12 has a spring 40 and the claw 12a is a cam 11c.
The notch 11b of the selection gear 21
It has escaped from the tooth 21a of FIG. 2 (solid line in FIG. 2). Trigger lever 2
3 waits at the position where the portion 23c is abutted against the portion 13b of the return lever 13 by the spring 25 (solid lines in FIGS. 2 and 3).

(2) Selection of the first row The rotation of the motor 6 causes the motor gear 7 to rotate in the direction of arrow J to rotate the reduction gear 8 and the planetary gear 10 in the directions of arrow K and L, respectively. At this time, the print switching cam 11 has the claw 12a.
The internal gear 11a cannot rotate because it is locked by.
Since the internal gear 11a cannot rotate, the planetary gear 10 revolves on the sun gear 8c while revolving around the sun gear 8c so that the selective drive gear 9 is connected to the planetary shaft 9a.
Rotate in the direction of arrow K via a. The rotation of the selective drive gear 9 causes the selective gear 21 to rotate in the direction of the arrow O, and also rotates the type shaft 22, the trigger yoke, and the type holder 53.
A desired type is selected by a well-known method by controlling the energization of the coil 29 by using the type position signal generated by the detection means (not shown) for generating the type position signal corresponding to the type 50a. The coil 29 is energized shortly before the desired type faces the platen 44 mounted on the frames 5, 18. When the coil 29 is energized, the trigger plate 27 is attracted to the trigger yoke rotating in the direction of the arrow O, and the trigger plate 2
7 and the trigger lever 23 are rotated in the direction of arrow O against the spring force of the spring 25. The rotation of the trigger lever 23 is 2
Rotate the selection claw 12 in the direction opposite to the arrow B by the portion 3b to move the claw 1
2c meshes with the teeth 21a of the selection gear 21
The rotation of (1) is stopped (two-dot chain line in FIG. When the selection gear 21 is locked, the character type shaft 22, the trigger yoke, the character type holder 53.
Is also stopped, the desired type 50a is stopped on the opposite surface of the platen 44, and the selection is completed (FIG. 6).

(3) Printing of the first digit and carry The rotation of the trigger lever 23 causes the selection claw 12 to rotate in the direction opposite to the arrow B to select a desired type, and at the same time, the claw 12a and the notch 11b are disengaged from each other and the printing is switched. The cam 11 can freely rotate. At this time, since the rotation of the selection gear 21 is stopped by the claw 12c, the rotation of the selection drive gear 9 is also stopped. Therefore, the rotation of the planetary gear 10 causes the internal gear 11a, that is, the print switching cam 11 to rotate in the arrow P direction. The rotation of the print switching cam 11 rotates the print gear 15, the print shaft 14, and the print cam 57. When the print cam 57 rotates, the print cam lead 57a causes the hammer 55 to rotate in the direction opposite to the arrow I direction via the transmission lever 58, and the 55b portion of the hammer 55 engages with the protruding portion 50b of the print belt 50 to cause the print belt 5 to move.
The letter 0a is projected from the inner side and the letter 50a is pressed against the platen 44 through the printing paper 45 to print (two-dot chain line in FIG. 6). It should be noted that ink is applied in advance by the ink roll 48 on the surface of the type 50a.

FIG. 7 shows an operation time chart of each element when the print switching cam 11, that is, the print shaft 14 makes one rotation. 101 is energization to the coil 29, 102 is the trigger lever 23, 103 is the operation of the selection claw 12, 104 is the type shaft 22
Rotation, 105 is the rotation of the print switching cam 11 and the print shaft 14, 106 is the print cam lead of the print cam 57, and 107 is the print cam lead.
Is a carry cam lead of the print cam 57, 108 is the operation of the return lever 13 in the direction of arrow G, 109 is the operation of the return lever 13 in the direction of arrow D, 110 is the paper feed clutch pawl 35, 1
11 shows the operation of the positioning plate 41. The energization of the coil 29 is cut off when the print switching cam 11 starts rotating (solid line in FIG. 7), but the selection claw 12 maintains the operating state with the claw 12a engaging with the outer periphery of the cam 11c. Trigger lever 23 is coil 2
9 is cut off, and the trigger plate 27 is activated by the action of the spring 25.
While rotating, rotates in the direction of arrow C and returns to the standby state (solid line in FIG. 2). As soon as the print gear 15 starts to rotate, the return lever 13 is moved in the direction of arrow G by the end face cam 15a provided on the print gear 15, and the projection 4 of the positioning plate 41 is moved.
The engagement with the 1b part is released. The positioning plate 41 is the spring 20.
Since it is urged in the arrow Q direction by, the teeth 41a rotate in the arrow Q direction and the teeth 41a mesh with the carry cam 57b (solid line in FIG. 11). The cam 11f of the print switching cam 11 is about 100 °
When rotated, the cutout portion 11h corresponds to the portion 13a of the return lever 13, but since the trigger lever 23 of the return lever 13 has already returned to the standby state, the portion 13b is locked by the portion 23c and does not operate. Therefore, the protrusion 41b of the positioning plate 41
And the protruding portion 13c of the return lever 13 contact each other in the girder direction, and the return lever 13 does not move in the direction opposite to the arrow G even if the end cam 15a of the print gear 15 disappears.
The engagement between the print cam 57 and the carry cam 57b is ensured. When the print shaft 14 rotates by 180 ° and the printing operation is completed and further rotated, the print cam 57 causes the teeth 41 of the positioning plate 41 to move.
It moves in the direction of arrow H by a and the cam lead of the carry cam 57b. When the print cam 57 moves, the carriage 54 that holds the print cam 57 and the hammer 55 also move at the same time, but there is a gap δ1 (FIG. 8) between the character holder 53 and the carriage 54, and the carriage 54 moves but the character 54 moves. The holder 53 is kept in contact with the end surface of the frame 18 by the action of the type spring 65 (FIG. 9). At this time, the portion 55b of the hammer 55 corresponds to the type belt 51. Notch 11 when print switching cam 11 rotates about 330 °
Since the claw 12a corresponds to b, the selection claw 12 rotates in the direction of the arrow B by the action of the spring 40, and the print switching cam 11 again.
Lock and print, and carry is completed.

(4) Selection of second digit The selection claw 12 rotates in the direction of arrow B and the print switching cam 11
Simultaneously with the lock, the claw 12c and the selection gear 21 are released from each other, and the selection gear 21 restarts to rotate again to select a desired type as described in detail in the selection of the first digit. At this time, the difference from the selection of the first digit is that the desired type selected in the first digit is selected from the type group provided on the type belt 50, but in the second digit, the type belt 51 is selected as shown in FIG. It is selected from the type group provided.

(5) Second digit printing and carry printing The printing is performed in the same manner as the first digit printing described in detail above. The difference is that at the first digit, the type belt 50 is projected from the inside and pressed against the platen 44 to print, but at the second digit, the type belt 51 is protruded from the inside as shown in FIG.
4 is to print by pressing. The carry is similar to the carry of the first digit and the teeth 41a of the positioning plate 41 and the print cam 57 are carried out.
The carriage 54 is driven by the cam lead of the carry cam 57b.
Is moved in the direction of arrow H. At this time, the point different from the last time is that the gap δ2 between the character holder 53 and the carriage 54 is set to be slightly smaller than the carry pitch, so the character holder 5
3 abuts on the carriage 54 and moves slightly in the direction of the arrow H, and the 55b portion of the hammer 55 and the type belt 52 correspond (see FIG. 1).
0).

(6) Third digit selection The same as the second digit selection. The difference from the second digit is that the character type selected in the second digit is from the character group of the character belt 51, but is selected from the character group of the character belt 52 in the third digit (FIG. 10).

(7) Third digit printing and carry printing The printing is performed in the same manner as the second digit. The difference from the second digit is that the type characters projected from the inside and printed by pressing on the platen 44 are the type characters of the type group of the type belt 52. Carry 2
It is done in the same way as the carry of the digit. The difference from the second digit is that the carriage moves by one digit, but at this time the type holder 53 and the carriage 54 are already in contact, so in the state shown in FIG. 10 (the type belt 52 corresponds to 55b of the hammer 55). Moving.

(8) Selection, printing, and carry of the fourth and subsequent digits are performed by repeating the above-described (6) and (7).

(9) Highest digit selection, printing, paper feed and carriage return The time chart (Fig. 7) corresponds to the chain double-dashed line. The highest digit is the paper feed clutch pawl when paper feed and carriage return are performed. Groove 37a of car 37 and paper feed clutch pawl 35
It is necessary to select a print type that the claws 35a of are opposed to. The selection operation is performed in the same manner as the previous time, but the energization of the coil at this time is not immediately cut off, as shown by the chain double-dashed line 101 in the time chart (FIG. 7), and the print switching cam 11 becomes 100
When it rotates, the notch 11h of the cam 11f returns to the recovery lever 1
It corresponds to the part 13a of 3. At this time, the trigger lever 23 is in an operating state because the coil 29 is not energized (FIG. 2,
3 (dashed-dotted line) is maintained. Therefore, the return lever 13 is rotated in the direction of arrow D by the spring 20 (two-dot chain line in FIG. 3).
When the return lever 13 rotates, the engagement between the portion 13e and the portion 35b of the paper feed clutch pawl 35 is released. When the paper feed clutch pawl 35 is unlocked, the pawl 35a rotates in the direction of arrow F by the action of a spring (not shown), and the pawl 35a meshes with the groove 37a of the paper feed clutch pawl wheel 37 (two-dot chain line in FIG. 3). Type axis 2 at this time
2, the rotation is stopped, the groove 37a corresponds to a specific type 50a having a type belt, and the claw 35a is in the stop position.
Since it is provided so as to mesh with each other, the claw 35a and the groove 37a mesh with each other. When the print switching cam 11 further rotates, the return lever 13 rotates in the direction opposite to the arrow D by the cam lead 11i of the cam 11f and returns to the standby state. However, since the paper feed clutch pawl 35 is already in operation, the portion 13e is a paper feed clutch. The pawl 35 is not returned to the standby state. Carriage return is performed as follows. When the return lever 13 rotates in the direction of arrow D, the protrusion 13c of the return lever 13 and the positioning plate 41
The protruding portion 41b is not contacted in the girder direction. When the print switching cam 11 rotates 145 °, the print gear 15
The end lever cam 15a loses its lead, and the return lever 13 moves in the direction opposite to the arrow G direction by the action of the spring 20.
Of the positioning plate 41 engages with the protruding portion 13c in the column direction (solid line in FIG. 5). Print switching cam is about 19
When it is rotated 0 °, the return lever 13 is rotated in the counter arrow D direction by the cam lead 11i, and at the same time, the positioning plate 41 is also rotated in the counter arrow Q direction so that the tooth 41a is disengaged from the carry cam 57b of the print cam 57. Held in (Fig. 11
Dash-dotted line). When the positioning plate 41 and the print cam 57 are disengaged from each other, the carriage 54 returns to the return spring 63 and the type spring 65.
The action returns to the standby state (first digit). When the print switching cam 11 makes one rotation and the type shaft rotates again, the paper feed clutch claw wheel 37 also rotates. At this time, since the claw 35a of the paper feed clutch claw 35 is engaged with the groove 37a, the paper feed clutch claw 35 and the paper feed drive gear 38 supporting the paper feed clutch claw 35 by the shaft 38b also rotate in the arrow R direction. .
When the paper feed drive gear 38 makes one revolution, 13 of the return lever 13
The portion e is re-engaged with the portion 35b of the paper feed clutch pawl 35, the mesh between the paper feed clutch pawl 35 and the paper feed clutch pawl wheel 37 is released, and the rotation of the paper feed drive gear 38 is stopped. The rotation of the paper feed drive gear 38 rotates the paper feed gear 47 and the paper feed rubber 49 via the paper feed transmission gear 39 to feed one line of the printing paper 45.

When the next line is to be printed subsequently, the above steps (2) to (9) may be repeated.

(10) Selection of highest digit, printing, and carriage return When only carriage return is performed in the highest digit, the groove 37a of the paper feed clutch pawl wheel 37 and the pawl 35a of the paper feed clutch pawl 35 do not face each other. Select. The operation of each component while the coil 29 is energized and the print switching cam 11 and the print cam 57 make one rotation is the same as the above-mentioned "selecting the highest digit, printing, paper feeding and carriage return" except for the paper feeding clutch claw 35. Done The operation of the paper feed clutch pawl 35 is shown by the solid line in the time chart (FIG. 7) 110. Even if the return lever 13 rotates in the direction of the arrow D and the engagement between the portion 13e and the portion 35b of the paper feed clutch pawl 35 is released, the paper feed clutch pawl 35 has a pawl 35 of the paper feed clutch pawl 35.
Since a contacts the stopper portion 37b of the paper feed clutch claw wheel 37, the standby state is maintained. In this state, the return lever 13 returns to the standby state again, so that the print switching cam 1
Even if one rotation of 1 is completed and the type shaft rotates again, only the carriage return is performed without entering the paper feeding operation.

As described above, when only the carriage return is performed at the highest digit, the paper feeding operation is not started, so that it is possible to print on the same line any number of times. Therefore, it is possible to perform emphasized printing in which the same character is overlaid and printed, or combined printing in which different characters are overlaid and printed. As an example of the combination printing, it is possible to print Y characters and = print characters overprinting, and to print ¥, but many other variations are conceivable depending on the combination of the printing characters.

[0031]

As described above, according to the present invention, it is possible to use an extremely simple paper feed clutch mechanism to print the same characters overlaid on each other, which is impossible in the prior art, or a combination of overprinted different characters. Printing becomes possible, and a printer with rich expressiveness can be provided at low cost. Further, in the present invention, the monochromatic serial printer having no type wheel switching mechanism has been described as an embodiment, but the present invention is not limited to this, and Japanese Patent Publication No. 4-2703.
By combining the type wheel switching mechanism disclosed in No. 3 with the paper feed clutch mechanism described in the present invention, a type serial printer capable of printing more character types can be obtained.
Further, according to this combination, a new effect that the characters of the first color and the second color can be printed on the same line, which is impossible in the conventional example, is produced. Therefore, the technical effect of the present invention is great.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention.

FIG. 2 is a side view of a selection mechanism showing an embodiment of the present invention.

FIG. 3 is a side view of a paper feed / carriage return mechanism showing an embodiment of the present invention.

FIG. 4 is a perspective view of a selection / paper feed / carriage return mechanism according to an embodiment of the present invention.

FIG. 5 is a plan sectional view of a carriage return mechanism showing an embodiment of the present invention.

FIG. 6 is a side sectional view of a printing mechanism showing an embodiment of the present invention.

FIG. 7 is a time chart showing an embodiment of the present invention.

FIG. 8 is a plan sectional view of a printing mechanism showing an embodiment of the present invention.

FIG. 9 is a plan sectional view of a printing mechanism showing an embodiment of the present invention.

FIG. 10 is a plan sectional view of a printing mechanism showing an embodiment of the present invention.

FIG. 11 is a side sectional view of a carry mechanism showing an embodiment of the present invention.

[Explanation of symbols]

 9 Selection drive gear 10 Planetary gear 11 Printing switching cam 12 Selection claw 13 Return lever 14 Printing shaft 21 Selection gear 22 Type gear 23 Trigger lever 27 Trigger plate 29 Coil 35 Paper feed clutch claw 37 Paper feed clutch claw wheel 38 Paper feed drive gear 41 Positioning plates 50, 51, 52 Type belt 53 Type holder 54 Carriage

Claims (1)

[Claims] 1. A printing member equipped with a printing member which has a plurality of printing characters arranged around it and is driven to rotate by a printing wheel shaft, and a printing means for printing by pressing the printing member and the printing characters selected on the printing paper. A carriage that moves in a direction orthogonal to the transport direction, a carry means that carries the carriage in the print line direction, a release means that returns the carriage to a home position, and a paper feed means that transports the recording paper. A small printer in which the printing means and the carry means are driven when the trigger means is in the first energization mode, and the release means and the paper feeding means are driven when the trigger means is in the second energization mode. A paper feed drive gear for transmitting a drive force to the feed means, a clutch pawl rotatably held by the paper feed drive gear, and a clutch pawl rotated corresponding to the type member. And a clutch ratchet wheel provided with the engaging portion, wherein the engaging portion of the clutch ratchet wheel corresponds to a predetermined character type of the character type member.