JPS62284746A - Printer - Google Patents

Abstract

PURPOSE:To accelerate printing speed by either separating two or more non- printing space type groups and printing type groups or arranging at least two or more non-printing type groups and printing type groups alternately. CONSTITUTION:A type belt 14 has 64 positions in a single round of rotation and these positions are divided into the I group and the II group. The A type provides a space (represented by a symbol ... 'U') from positions 0 to 10, symbol types from positions 11 to 21 and numerical types from positions 22 to 31. The B type provides a space from positions 0 to 20 but at every other position, symbol types in odd-number digits from positions 11 to 20 and numerical types from positions 22 to 31 which constitute the I group with the II group aligned in the same pattern as the I group. When printing up to the digit halfway is requested, the space types of remaining digits are selected in a shortest time due to such type arrangements.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a small printer used for desktop calculators, measuring instruments, data terminals, and the like.

[Prior Art] The type layout of a conventional printer using a type belt is, for example, as disclosed in Public Utility Model Publication No. 166954/1980, Space Street is in the symbol type group and has only one. The printing method was also a type in which a carriage with a hammer moved the characters up.

[Problems to be solved by the invention] Conventional serial printers require a large number of parts in order for the hammer holder carrying the print grade cam and hammer to carry up, and for the hammer holder to return when the rack is released. It was. In order to solve these drawbacks, this invention has hammers installed on all columns, and the cam that drives the hammers prints using a printing drum arranged spirally around the circumference.The printer has no hammer holder return action, and increases the printing speed. Our aim is to supply printers with high commercial value.

[Means for Solving the Problems] In order to solve the above problems, in the present invention, the character array on the character belt is divided into two or more space character groups that are not printed and a character group that is used for printing. Alternatively, the type arrangement can be solved by arranging at least two or more space type characters that are not printed and other type characters in a different manner from each other.

[Function] For printers that print serially from the least significant digit to the most significant digit, if printing is required up to an intermediate digit, space type must be selected for the remaining digits. By arranging the type as described above, the space type can be selected in a short time, thereby increasing the printing speed and increasing the product price of the printer.

[Example] Next, one embodiment of the present invention will be described.

Schematic Mechanism> FIG. 1 is an exploded perspective view of the printer, FIG. 2 is a schematic configuration diagram of the printer, and FIG. 3 is a sectional view of the switching mechanism.

FIG. 4 is a schematic side sectional view. A drive boob IJ 9 and a driven pulley 19 are arranged at a predetermined interval, and an endless type belt 14 is passed between them.

The driven boob IJ-19 is rotatably fitted to the frame 1. Reference numeral 2 denotes a motor to which a bevel gear motor gear 3 is attached. The reduction gear 4 has a bevel gear that meshes with the motor gear 3 and a spur gear that meshes with the transmission gear 5 and has a smaller outer diameter than the transmission gear 5. The selection pawl 7 has a structure that allows it to engage with the drive pulley 9 and the printing switching gear 10, and when it is engaged with the printing switching gear 10, it does not engage with the driving boob 19, but engages with the driving boob I79. The mechanism is such that it does not engage with the print switching gear 10 when it is in the position (details will be described later). Moreover, the selection claw 7 is rotatably attached to the frame 1,
A moment is applied in the direction of the arrow by the coil spring 8 during standby.

Furthermore, it engages with the attraction plate 33 of the electromagnet 6. sun gear 2
2 is rotatably attached to the frame 1 and has a gear that meshes with the transmission gear 5 and a gear that meshes with the planetary gear 23 that is not rotatably attached to the drive boot I79. The detection wheel 24 is fixed to the drive pulley 9 and further meshes with the gear of an R inspection cam 25 rotatably attached to the frame 1, and the detection cover 27
A detection brush 26 made of a conductive material such as nickel silver is fixed to the
is pressed against. A circuit consisting of a conductive part and a non-conductive part is formed on the surface of the detection wheel 24 that comes into contact with the detection brush 26. The printing drum 12 has a printing claw part 12a on its circumference that pushes out a hammer 13, and is rotated by a worm 11 which is rotatably attached to the frame 1 and meshes with the printing switching gear 10.

A feed roller 29 is fitted to the paper feed gear 28, and the paper feed gear 28 is connected to the paper feed drive gear 1 of the print drum 12.
It is possible to mesh with 2b. The pushing roller 18 is pressed against the feed roller 29 by the back shape of the pushing shaft 210 which is elastically deformed. The ink roller 20 is rotatably attached to the frame 1 and presses against the type belt 14. Frame 1 also serves as a paper guide.

Next, a type belt according to an embodiment will be explained.

Structure of Type Belt> This will be explained with reference to FIGS. 15 and 16. Type Held 14
As shown in FIG. 15, it has an endless shape, and a large number of printed parts 14a are individually provided along the circumferential direction at a predetermined pitch on the outer circumferential side, and predetermined letter parts 14a are provided along the circumferential direction on the inner circumferential side. A large number of belt teeth 14b are provided at pitches. Each printed portion 14a and belt toothed portion 14b are paired with each other, and the printed portion 14a, the adjacent printed portion 14a, and the belt toothed portion 1 are paired with each other.
4b and the adjacent belt tooth portion 14b is a thin connecting portion 14.
They are connected to each other by c. These type belts 14 are made of a stretchable elastic material such as rubber. The type belt 14 is divided into a large number of positions in one rotation. Symbols such as "+" and "-" in each group, "O" and "1"
”...The arrangement of numeric characters for “9” is arranged in the same group. In one of these embodiments, the type belt 14 has 64 positions (one position is one character) and is divided into two groups, If and 11 groups, and the arrangement of each is shown in FIG.

Type A has a space (indicated by the symbol...rLIJ) from position 0 to position 10, symbol type from position 11 to position 21, and number type from position 22 to position 31.

The B type has a space for every 20 positions from the O position, a symbol for the odd numbered digits from the 1st position to the 21st position, and In from the 22nd position to the 31st position consists of numbers, etc., and the 11th group is arranged in the same way as the 1st group. It has become. The space does not have the type part 14a, but otherwise has the same shape. As explained in ``Schematic configuration'', type belt 1
The drive pulley 9 has 16 grooves that mesh with the belt teeth 14b, and meshes with each belt tooth 14b. Type section is included. Next, timing pulse detection will be explained with reference to FIG. 5 and FIG. 17.

-Detection of Timing Pulse> Four detection brushes 26 made of a conductive material such as nickel silver are pressed into contact with the detection wheel 24 fixed to the drive pulley 9. Two brushes, a T-brush 26T and a T-brush 26, are in pressure contact with each other on the locus of the TP pattern 24a of the conductive portion. TP pattern 2
The number of divisions of the character belt 4a is the same as the number of divisions of the drive pulley 9, and is divided into 16 parts, which is one integer fraction of the character position of the character belt 14. When the T brush 26T is in pressure contact with the TP pattern 24a, the T brush 26T is on the non-conductive part 24b, and when the T brush 26T is in pressure contact with the TP pattern 24a, the T brush 26T is on the non-conductive part 24b. The T brush 26T and the brush 26 are installed so that the An R brush 26R is in pressure contact with the trajectory of the R pattern 24r. The detection wheel 24 and the R inspection cam 25 mesh with gears, and the detection wheel 24
The R inspection cam 25 rotates 2.5 times per one rotation. R inspection cam 2
5 is made of a non-conductive material, and the disc portion 25a is interposed between the detection wheel 24 and the R brush 26R, and is connected to the R brush 26R and the R pattern 2.
The conduction of 4r is cut off. R brush 2 as shown in Figure 5.
Detection car 2 starts when 6R and R pattern 24r are in contact.
4 rotates once, the R detection cam 25 rotates 2.5 times, and the R brush 26R cannot contact the R pattern 24a due to the disk portion 25a. When the detection wheel 24 is rotated one more time, making a total of two revolutions, the R detection cam 25 makes five revolutions in total, returning to the state shown in FIG. 5, and the R brush 26R comes into contact with the R pattern 24a through the notch 25b. Since the detection vehicle 24 was divided into 16 parts, 16x
2=32 The R brush contacts the R pattern once in 32 positions. R pattern 24 for common brush 26c
A common ten potential is applied to r and the TP pattern 24a. The detected T pulse, the waveform of the pulse is T brush 26T,
Vibration of the t-brush 26 and the t-brush 26T and t-brush 2
Chattering is likely to occur due to contact resistance between the 6t and the TP pattern 24a. Therefore, the leading edge 35a of the pulse 35
A countermeasure method is adopted in which the rising edge of the T pulse is recognized and control is performed using a shaped waveform that is corrected to the rising and falling pulses of the waveform.The leading edge 35a of the rising edge of the T pulse due to the potential difference between the T brush 26T and the common brush 26c. The shaping waveform rises at R, and the printer drive circuit creates a shaping waveform that falls at the leading edge 35a of the rising pulse by the T brush 26t and common brush 26c, and control is performed using this shaping waveform.
The shaped waveform in which the pulse is rising is designated as TPO, and the lowest digit position is set to 31 (or 6) of the type position on the type belt 14.
3) The type belt 14 is passed between the drive booby IJ9 and the driven pulley 19 with the two facing each other. The electromagnet energization waveform is controlled by the rising edge of the leading edge 35c of the shaping waveform. The electromagnet is energized at the rising edge of the leading edge 35c of the shaping waveform, and is cut off at the rising edge of the leading edge 35c of the next shaping waveform. The fastest mode for continuous printing is when the type arrangement of the type belt 14 is A in Fig. 16.
In the case of the type, as shown in Fig. 17 (a) (the leading edge of TPO is energized, the leading edge of TPI is energized, the leading edge of TP2 is energized, and the leading edge of TP3 is energized).
This is a mode that cuts off at the leading edge. This embodiment is a cycle machine that prints from the first digit to the most significant digit when printing one line, and then completes the paper feeding process. Therefore, if the desired printing is 7 digits, it is necessary to selectively print space digits from the 8th digit to the most significant digit. When using this printer as a calculator,
There are few cases where it is necessary to print up to the most significant digit, and the printer is required to have a high printing speed. Therefore, a number of space positions are provided on the type belt 14 as a means of slowing down the printing speed. Another arrangement example of the type belt 14 and its time chart are shown in the 16th example.
Place the seafood in Figure B type and Figure 17 (B).

In this example, the type belt 14, the detection wheel 24, the drive boo IJ
9. When the driven boot I/No. 19 etc. is started and stopped at high speed, the moment of each inertia and acceleration function becomes large instantaneously, and the backlash of each gear and the gap in the mechanism narrow the area required for the electromagnet energization waveform. This is sometimes the cause of incorrect selection. As a countermeasure to this, a method is adopted in which the fastest printing pattern is delayed by one pulse. Next, the type selection mechanism will be described.

Type selection mechanism This will be explained with reference to FIGS. 1 to 3, FIG. 6, and FIG. 19.

A motor 2 fixed to an injection-molded frame 1 by utilizing the elasticity of the frame 1 rotates in the direction of arrow A. The reduction gear 4 rotates in the direction of arrow B via the motor gear 3, and the transmission gear 5 rotates in the direction of arrow C. In response to the rotation of the transmission gear 5, the sun gear 22 rotates in the direction indicated by the arrow, and the planetary gear 23 rotates in the direction indicated by the arrow E. FIG. 6(A) is an explanatory diagram of the differential mechanism in which the electromagnets are not energized. The planetary gear 23 rotating in the direction of the arrow E applies a rotational force to the printing switching gear 10 in the direction of the arrow H from the internal teeth 10a of the printing switching gear 10, but the claw 7a of the selection claw 7 rotates through the opening 10b of the printing switching gear 10. , and prevents rotation of the printing switching gear 10. As a result, the planetary gear 23 revolves in the direction of arrow F along the internal teeth 10b, and the drive pulley 9 rotates in the direction of arrow F. Drive boo 1-79
As explained in the above-mentioned ``Construction of Type Belt'', there is a groove 9b that engages with the belt teeth 14b of the type belt 14, so that the type belt 14 can be reliably rotated in the direction of arrow G without slippage. The driven boo IJ19 is a printed bell! - It plays the role of reducing the load so that the rotation of the type belt 14 can rotate smoothly and that the type belt 14 runs parallel to the platen 17. If cost reduction is more important than the rotating load of the type belt 14, the driven pulley 19 may be eliminated by providing the injection molded frame 1 with a cylindrical or semi-cylindrical shape in order to reduce parts costs and assembly costs. You can also do it. When the drive boob I79 rotates, the T brush 26T, the T brush 26 of the detection brush 26 detects a repulse from the common brush 26c, and the R brush 26R as described in ``Detection of timing pulse'', and the type belt 14 is applied to the desired printing area. When the desired character portion 14a is reached, an energizing signal is sent to the electromagnet 6. FIG. 6(b) is an explanatory diagram of the differential mechanism when the electromagnet 6 is energized. When the electromagnet 6 is energized, a force in the direction of the arrow is generated on the suction plate 33. The selection claw 7 is in contact with the suction plate 33.
A force is applied to c and a moment is applied in the direction of arrow M. When the moment in the direction of arrow M given by the suction plate 33 becomes larger than the moment in the direction of arrow M caused by the coil spring 8 and the moment of the frictional positioning end applied to the claw portion 7a, the selection claw 7 rotates in the direction of arrow M. . The locking portion 7b of the selection pawl 7 jumps into the locus of the ratchet 9a of the drive boob IJ 9 rotating in the direction of arrow F, collides with the ratchet end face 9b, and the drive pulley 9 stops rotating. The planetary gear 23 rotatably attached to the drive boob I79 stops its revolution around the sun gear 22, and changes to an autorotational motion in which it rotates in the direction of arrow E. On the other hand, the print switching gear 10 becomes rotatable because the selection pawl 7 rotates in the direction of arrow M and the pawl portion 7a disengages from the opening portion 10b. The printing switching gear 10 rotates in the direction of the arrow H as the internal teeth 10a receive the rotation of the planetary gear 230, which has stopped its revolution and is rotating in the direction of the arrow E. opening 10
The claw portion 7a of the selection claw 7 that is disengaged from the cam outer peripheral portion 1
Press 0c. The worm 11 is rotated in the direction of arrow 1 by the gear 11b of the worm 11, which is engaged with the gear 10d provided on the outer periphery of the print switching gear 10. The number of teeth zlO of the gear 10d of the printing switching gear 10 is the same as the gear 1 of the worm 11.
1b is set to an integral multiple of the number of teeth 211, and the number of openings 10b of the printing switching gear 10 is set to z10/z11.

In this example, zlO=48. It is set to zll=12. When the worm 11 rotates once, the opening 10b comes. The claw portion 7a of the selection claw 7, to which a moment is applied in the direction of the arrow by the coil spring 8, is rotated by the rotating print switching gear 10.
is in pressure contact with the cam outer circumferential portion 10c, and the next opening 10b
When it comes, it rotates in the direction of the arrow and engages with the opening 10b.

The locking portion 7b is disengaged from the ratchet 9a of the drive boob IJ 9, and the suction plate 33 is moved in the direction of arrow W. The printing switching gear 10 stops rotating, the planetary gear 23 begins to revolve in the direction of arrow F, and the drive pulley 9 rotates in the direction of arrow F. The type belt 14 begins to rotate and returns to a standby state waiting for the next energization signal to the electromagnet 6. Next, the printing mechanism will be explained. Next, the printing mechanism will be explained.

Printing mechanism> Fig. 4, Fig. 7 to Fig. 9, Fig. 12 to Fig. 14, Fig. 19
This will be explained using FIGS. 21 to 21. FIG. 14 is a perspective view of the printing drum 12, FIG. 13 is a perspective view of the hammer 13 unit, FIG. 7 is a sectional view of the standby state before starting printing of the first digit, and FIG. 8 is printing of the first digit. A cross-sectional view of the process, Figure 9 is a cross-sectional view of the standby state after printing the first digit, and Figure 12 is a home position brush state diagram during standby before the start of printing the first digit.
The figure shows a state diagram of the home position brush after the first digit has been printed. The hammer 13 consists of a pressing part 1000, an elastic part 13c, and a connecting part 13d, and is integrally molded of plastic, or only the elastic part 13c is insert molded of a metal spring material. The number of hammers 13 corresponds to the number of printed digits, and the hammers 13 are connected by connecting portions 13d, and the connecting portions 13d are fixed to the frame 1. First digit printing will be explained.

Home position cam 1 provided on the side of print drum 12
2d is a conductive material such as nickel silver that pushes down the elastically deformable home position brush 26H in the direction of arrow X. The common brush 26
The print drum home position signal is generated by contacting with a. This signal is checked to confirm that the printing drum 12 is in the first digit printing standby position. When the desired character portion 14a of the character belt 14 arrives at the first digit, an energizing signal is applied to the electromagnet 6. The worm 11 is rotated by rotation from the print switching gear 10 as described above in the ``Print Selection Mechanism''.

The worm tooth 11a is composed of a tooth tip portion 11e, a circumferential protrusion 11c, and a spiral protrusion lid. FIG. 19 is a diagram showing the relationship between the worm tooth 11a and the pin 12c in a standby state.

The solid line is a developed view of the worm tooth 11a. The dashed line is a perspective view of the worm tooth 11a. During standby, the circumferential protruding bundle 11c of the worm teeth 11a is located in the locus of movement of the pin 12c of the printing drum 12 and between the bins 12c, and controls the free rotation of the printing drum 12. Tooth tip portion li of the worm tooth 11a
The gap S3 between the lower pin 12c and the lower pin 12c is made larger than the gap S1 between the circumferential protrusion 11c and the lower pin 12c so that the tip 12c does not collide between the pins 12c. A gap S3 is provided between the two. When the worm 11 rotates, the tooth tip lie enters the locus of the middle 12c before the circumferential protrusion 11c, which controls the rotation of the print drum 12, separates from between the bins 12c. The circumferential protrusion 11c is the pin 12c
After that, the pin 12c moves away from the trajectory of the spiral protrusion lid.
The printing drum 12 is lifted up by the upper surface 11f of the printer 1 and rotates in the direction of arrow O. The printing claw part 12a installed on the circumference of the printing drum 12 pushes out the back surface 13b of the pressing part 13e of the hammer 13 in the direction of arrow U, and the pressing surface 13a pushes the belt tooth part 14b of the type belt 14 which is stopped. The printing portion 14a is pressed against the printing paper 16. Furthermore, the printing drum 12
When the hammer 13 rotates in the direction of the arrow O, the back surface 13b of the pressing surface 13e disengages from the printing claw portion L2a that was sliding on the back surface 13b, and due to the elasticity of the elastic portion 13C of the hammer 13, the hammer pressing portion 13e moves in the direction of the arrow V. Move and return to standby position.

On the other hand, the home position brush 26H made of an elastic body is elastically deformed, and the home position cam 12d of the print drum 12, which has been brought into contact with the common brush 26a, rotates in the direction of arrow 0 and is disengaged from the home position brush 26H. The disengaged home position brush 26H moves in the direction of arrow Y and separates from the common brush 26a. The home position signal obtained from the home position brush 26H and the common brush 26a is interrupted during printing of the first digit (see FIG. 18). The character selection explained in the above-mentioned "Print character selection mechanism" and the printing operation explained above are repeated from the second digit to the most significant digit. If printing is not necessary, a space character is selected and printed from the 14th character position on the character belt. 21st
The figure is an enlarged view of the printed state. FIG. 20 is a partial detailed diagram illustrating the printing position and the position of the comb teeth. The comb teeth 15 are provided on the platen 1, which also serves as a part of the guide, so that the printing paper 16 faces the hammer 13. The comb teeth 15 are injection molded in such a manner that the length thereof extends from the lower part of the printing area 34 through which the character part 14a passes during printing to the vicinity of the upper end 34a of the printing area 34, projecting from the frame 1. Comb teeth 15
is arranged between the print area 34 and the adjacent print area. This will be explained with reference to FIG. The dashed line indicates the standby position. The hammer 13 held at each printing digit is pushed out serially by the rotation of the printing drum 12, and the hammer 13 moves in the direction of arrow U and pushes the printing part 14 through the printing belt teeth 14b.
Press a on the printing paper 16. Since ink is applied to the type portion 14a by the ink roller 20, the fine print paper 1
The ink is transferred to 6. Since the distance S between the comb teeth 15 and the printing paper 16 is longer than the height m of the type portion 14a, the connecting portion 14C;/l' of the type belt 14 is deformed by the comb teeth 15. The printing portions 14a on both sides of the printing digit are printed paper 1.
6, a gap is ensured so that no one can get closer than a certain distance.

This will be more reliable if the thickness t of the comb teeth 15 is greater than the height m of the type 14a. Therefore, the printing part 14a of the printing process
The structure is such that the printing portions 14a on both sides of the printing paper 16 do not come into contact with the printing paper 16. Next, the paper feeding mechanism will be explained.

Paper feed mechanism> This will be explained with reference to FIGS. 10, 11, 12, and 18. FIG. 10 is a sectional view of the printing drum after printing the most significant digit. FIG. 11 is a sectional view during paper feeding. The printing drum 12 has a printing claw portion 12a with 13 digits, which is the maximum number of digits to be printed. There are 15 pins 12 on the end surface of the print drum 12, and the print drum 12 is rotated by the worm 11 in 15 steps. Two steps are used for paper feeding. Print drum 1 to print the most significant digit (13 digits)
2 rotates in the direction of arrow 0. A fan-shaped paper feed drive gear 12b provided on the side surface of the print drum 12 rotates in the direction of arrow 0 and meshes with the paper feed gear 28. After printing the most significant digit (13 digits), the drive pulley 9 rotates and the process moves to the selection process. An energizing signal waveform is applied to the electromagnet 6 at an arbitrary position. As described above, the worm 11 rotates, the print drum 12 rotates in the direction of arrow O, and the paper feed drive gear 12b also rotates in the direction of arrow 0.

(Since the printing drum 12 does not have the printing claw portion 12a, the hammer 13 does not move and does not print.) The paper feed gear 28 receives rotation from the paper feed drive gear 12b and rotates in the direction of arrow Q.

A feed roller 29 made of a material such as rubber or soft resin is fitted or two-color molded (insert molded) on a concentric shaft of the paper feed gear 28 and has a diameter larger than the surface outer diameter of the paper feed gear 28. . The feed roller 29 also rotates in the direction of arrow Q. The printing paper 16 pressed against the presser roller 18, which is subjected to a force due to the elastic deformation of the feed roller 29 and the presser shaft 21, is fed by friction in the direction of arrow R. In this embodiment, the desired paper feeding pitch is obtained by two paper feeding operations. Therefore, a signal is applied to the electromagnet 6 again to perform the paper feeding operation, and the printing drum 12 returns to the standby position before printing the first digit as shown in FIG. 7, completing the printing cycle for one line. Home position cam 12d is home position brush 2
6H is pushed down in the direction of arrow X to contact the common brush 26a. FIG. 18 is a time chart in which an energizing signal is applied to the electromagnet 6 in the shortest possible time using a paper feed signal. If the next line is to be printed subsequently, the series of operations described above may be repeated. Next, the fine paper guide will be explained.

Figure 22 is a schematic diagram of the inlet of the fine paper 16 in the paper guide section, (B) is a front view of the printing paper 16, and (A) is the cross section of the -k= section. It is a diagram. The guide for the printing paper 16 is composed of a combination of the frame 1, a platen 17 which also serves as a paper guide, and a separator 36. Frame l and platen 1
A groove 1a and a groove 17a are provided at relative positions of 7. The groove 17a of the platen 17 has a recess 17b. The separator 36 is the groove 1a of the platen 1 and the groove 17a of the platen 17.
A slope 36a is provided to facilitate insertion into the grooves 1a and 17a. Also platen 1
The protrusion 36b that engages with the recess 17b provided in the groove 17a of No. 7
Further, slopes 36d for guiding the printing paper 16 are symmetrical and tapered.

In the case of 84 in the paper of the printing paper 16.

The printing paper 16 is a frame 1 larger than the maximum tolerance of the width 84.
Left and right regulation is performed by the width 56 of the printing paper 16, and regulation is performed by gaps s8 and s9 that are larger than the thickness of the printing paper 16. The insertion opening has a rectangular funnel shape formed by the slope 1b of the frame 1 and the slope 17C517d of the platen 17 for easy insertion.

In this case, separator 37 is not used.

In the case of 85 in the paper of printing paper 16.

After frame 1 and platen 17 are assembled, set the :ala of frame 1 so that the dimensions are approximately the same as the maximum tolerance of 85 in the paper.
Then, insert the separator 36 along the groove 17a of the platen 17. The protrusion 36b of the separator 36 is connected to the platen 1.
7, the gap slO is expanded by d1 due to elastic deformation of the frame 1 or both, and the protrusion 36b enters the recess 17b of the platen 17. The gap widened by dl is sl
Returning to O, the separator 36 becomes difficult to come off and is retained. The separator 36 has slopes 17c and 1 of the platen 17.
There are slopes 36c and 36d that have the same function as the slope 7d, and a slope 36e that has the same function as the slope 1b of the frame 1.

The separator 36 has a symmetrical shape, and when it is necessary to guide both sides of the printing paper 16, the separator 36 has a symmetrical shape.
Just the type.

[Effects of the Invention] As described above, the present invention includes a type belt having a large number of type characters around it, a hammer member for pressing a selected type of the type belt onto a printing paper, and a hammer member for pressing the selected type characters on the type belt from the lowest digit to the lowest digit. In a printer equipped with a hammer drive means that operates serially up to the upper digits, the arrangement of the type belt is divided into two or more space type groups and the type used for printing, or the space type is separated from other type. The feature is that at least two or more are arranged differently from each other, so it is possible to select the space in the shortest time for printing up to the intermediate digits, and the printer speed is faster, the product value is high, and the cost is low. printers can be supplied.

[Brief explanation of the drawing]

Embodiments of the present invention are shown in FIGS. 1 to 22. FIG. 1 is an exploded perspective view of the printer of the present invention. FIG. 2 is a schematic configuration diagram of the printer viewed from above. FIG. 3 is a sectional view of the switching mechanism. FIG. 4 is a schematic side sectional view. FIG. 5 is a diagram illustrating the relationship between the detection vehicle and the brush. FIG. 6 is an explanatory diagram of the differential mechanism. FIG. 7 to FIG. 9 are explanatory diagrams showing the printing operation. FIGS. 10 and 11 are explanatory diagrams showing the paper feeding operation. FIG. 12 is an explanatory diagram of the home position signal. 13th
The figure is a perspective view of the hammer. FIG. 14 is a perspective view of the printing drum. FIG. 15 is an explanatory plan view of the type belt. Figure 16 is a printed bell!・Type layout diagram. Figures 17 and 18 are time charts. FIG. 19 is a diagram showing the relationship between the printing drum and the worm. FIG. 20 is a partial detailed diagram illustrating the position of the W tooth. FIG. 21 is an enlarged view of the type belt in a printing state. FIG. 22 is a schematic diagram of the printed paper guide section. 1...... Frame 6... Electromagnet 7... Selection claw 9... ......Drive pulley 10...
...Print switching gear 11... Worm 12... Print drum 13... Hammer 14... - Type belt 15...11i Teeth 16... Print paper 17... Platen 19... Driven pulley 20... Ink roller 22...
...Sun gear 23...Planetary gear 24...Detection wheel 25...R inspection cam 26... ...Detection brush 28...Paper feed gear 29...Feed roller 33...Suction plate 36... Separator 37 Type belt 40 Subordinate ÷ Cover 41 Frame or more Applicant Seiko Epson Co., Ltd. Agent Patent attorney Tsutomu Mogami and others - name? ! "-"-1"("1-5・Jl) 8... Figure 4 Figure 7 Figure 8 Figure 9 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 O-1111 Figure 19 Figure 21

Claims (2)

[Claims] (1) Printed paper that is transported in a predetermined direction, a stretchable type belt that has a large number of printed characters around it at a predetermined pitch and rotates perpendicular to the traveling direction of the printed paper, and the type belt. a hammer member that presses the type printed on the printing paper; a hammer drive means that operates the hammer member serially from the lowest digit to the most significant digit; a belt drive means that controls the driving of the type belt; and a supply of the printing paper. A printer equipped with a paper feeding means, characterized in that the type arrangement state of the type belt is divided into two or more space type groups that are not printed and a type group used for printing. (2) The printer according to claim 1, wherein the arrangement state of the type belt is such that at least two or more space type characters that are not printed are arranged differently from other type characters.