JPH0822593B2 - Printer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a type serial printer using a loop type belt.

[Conventional technology]

Conventionally, in a type serial printer using a loop type belt, the flange shape of the pulley on which the type belt is stretched is as shown in FIG. 22, as shown in FIG.
Since the character 14a is formed in a circular shape at the same height as that of the character 40a, the character 14a protrudes from the flange portion 40a, and the ink roll 20 has a structure in which the character rolls on the character 14a and comes into contact therewith to apply the ink.

[Problems to be solved by the invention]

In the case of such a structure, since the surface pressure of the ink roll is different depending on the type, such as, for example, .. and 8, the difference in print density is caused by the difference in the amount of ink applied. Further, in the mechanism in which the ink roll is provided on the driven pulley side, since the type belt is vibrating immediately after the type is selected, there is a type at the contact position of the ink roll, there is a type with or without a type, or there is a change in the rotation direction. The resistance of the ink roll changes depending on whether it is on the front or back or only on one side, and the printing position varies greatly because the stop position of the type is different.

Therefore, in order to solve such a drawback of the related art, the present invention forms a convex shape portion on the flange portion of the ink-roll-side pulley at a position in the same phase as the print type, so that the difference in the surface pressure of the ink roll due to the print type is increased. It is an object of the present invention to provide a printer in which the difference in the print density due to the difference in the amount of ink applied is reduced, and the variation in the character stop position during character selection is reduced.

[Means for solving problems]

In order to solve the above-mentioned problems, the printer of the present invention has a loop-shaped print belt in which print characters of different heights are arranged at a predetermined pitch on the outer circumference, and a direction in which the print belt is wound and is orthogonal to the rotational direction of the belt. It has a pulley provided with a flange for positioning, and an ink roll which is arranged facing the pulley and applies ink to the type, and the outer diameter of the flange of the pulley is the locus of the type of the type belt wound on the pulley. It is characterized by being approximately equal to the outer diameter.

Further, the flange is characterized in that the outer diameter of the locus of the printed characters is substantially the same only in the portion corresponding to the printed characters.

[Action]

According to the above configuration of the present invention, since the outer circumference of the flange substantially matches the type height, the ink roll for pressing the type has different type heights such as when there is no type, or the contact area of the type. If is small, it will be guided to the flange.

Further, the unevenness of the outer periphery of the flange allows the ink roller to rotate more smoothly.

〔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 a switching mechanism section. FIG. 4 is a schematic side sectional view. The drive pulley 9 and the driven pulley 19 are arranged at a predetermined interval, and a looped type belt 14 is stretched between them. The flange portion of the driven pulley 19 is formed with a raised shape portion 19a at a position in the same phase as the printed characters, and 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 claw 7 has a structure capable of engaging with the drive pulley 9 and the print switching gear 10, and when engaged with the print switching gear 10, does not engage with the drive pulley 9 but engages with the drive pulley 9. The mechanism is such that it does not engage with the print switching gear 10 when it is operating (details will be described later). Moreover, the selection claw 7 is the frame 1
Is rotatably attached to the shaft, and the coil spring 8 applies a moment in the direction of arrow L during standby. Further electromagnet 6
Of the suction plate 33. The sun gear 22 has a gear that meshes with a planetary gear 23 that is rotatably mounted on a gear drive pulley 9 that meshes with the transmission gear 5, and is rotatably mounted on the frame 1. The detection wheel 24 is fixed to the drive pulley 9 and further meshes with a gear of an R detection cam 25 rotatably attached to the frame 1, and is fixed to the detection force bar 27 and is a detection brush made of a conductive material such as nickel silver. Pressed against 26. A circuit including a conductive portion and a non-conductive portion is formed on the surface of the detection wheel 24 that contacts the detection brush 26. Print drum 12
Has a print claw 12a on the circumference that pushes out the hammer 13,
It is rotated by a worm 11 which meshes with the print switching gear 10 and is rotatably attached to the frame 1. A feed roller 29 is fitted in the paper feed gear 28, and the paper feed gear 28 can mesh with the paper feed drive gear 12b of the print drum 12. The push roller 18 is pressed against the feed roller 29 by the load of elastic deformation of the push shaft 21. Ink roll
Reference numeral 20 is rotatably attached to the driven pulley side of the frame 1 and is in pressure contact with the type belt 14.

 Next, the type belt of the embodiment will be described.

<Structure of type belt> This will be described with reference to FIGS. 15 and 16. Type belt 14 is first
As shown in FIG. 15, it has a loop shape, and a large number of type portions 14a are individually provided on the outer peripheral side at a predetermined pitch along the circumferential direction, and on the inner peripheral side at a predetermined pitch along the circumferential direction. A large number of belt tooth portions 14b are provided. The individual character portion 14a and the belt tooth portion 14b are paired with each other, and the character portion 14a and the adjacent character portion 14a are connected to each other with a thin connecting portion 14c between the belt tooth portion 14b and the adjacent belt tooth portion 14b. Has been done. These type belts 14 are formed of a stretchable elastic material such as rubber. The type belt 14 is divided into a large number of positions at one position. Symbol type such as "+" and "-" of each group,
The arrangement of numeric characters of "0", "1" ... "9" is arranged in the same group. As one example of this embodiment, the type belt 14 has 64 positions (1 position is 1 character) and is divided into two groups, I group and II group, and each array is arranged from 0 position to 1 position as shown in FIG. Space (up to 20 positions each) (symbols…, indicated by “”) I group is composed of symbol type in odd digits from 1 position to 21 position and number type from 22 position to 31 position. II group is I group It has the same arrangement as. The space has no print parts 14a and 14b.

As described in <Schematic Configuration>, the type belt 14 is stretched over the driving pulley 9 and the driven pulley 19, and the driving pulley 9 and the driven pulley 19 have 16 grooves for meshing with the belt tooth portions 14b or each belt tooth portion. It meshes with 14b. Type belt 14
The drive pulley 9 and the driven pulley 19 are reliably driven without slippage. Next, regarding the inking mechanism, FIG. 1 and FIG.
This will be described with reference to the figure.

<Inking Mechanism> The ink roll 20 rotatably attached to the ink roll shaft 41 standing on the frame 1 has a raised portion 19a formed on the letter portion 14a of the letter belt 14 and the flange portion of the driven pulley 19. While pressing and rotating, the ink is applied to the character portion 14a. Next, the detection of the timing pulse will be described with reference to FIGS.

<Detection of Timing Pulse> Four detection brushes 26 made of a conductive material such as nickel silver are pressed against the detection wheel 24 fixed to the drive pulley 9. The T brush 26T and the t brush 26 are located on the locus of the TP pattern 24a of the conductive portion.
Two of t are pressed. The number of divisions of the TP pattern 24a is the same as the number of divisions of the drive pulley 9, and is divided into 16 which is an integer fraction of the character position of the character belt 14. T brush 26T
When the t brush 26t is in pressure contact with the TP pattern 24a, the t brush 26t is on the non-conductive portion 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 portion 24b. T brush 26T and t brush 26t are installed. The R brush 26R is in pressure contact with the locus of the R pattern 24r. Detection car
24 and the R detection cam 25 mesh with each other, and one rotation of the detection wheel 24 causes the R detection cam 25 to rotate 2.5 times. The R detection cam 25 is made of a non-conductive material, and the disc portion 25a is interposed between the detection wheel 24 and the R brush 26R.
The continuity between 26R and R pattern 24r is cut off. As shown in FIG. 5, when the detection brush 24 is rotated once while the R brush 26R and the R pattern 24r are in contact with each other, the R detection cam 25 rotates 2.5 times and the R brush 26R can contact the R pattern 24a by the disc portion 25a. Absent. When the detection wheel 24 makes one more rotation, a total of two rotations, the R inspection cam
The 25 rotates a total of 5 times and returns to the state of FIG. 5 so that the R brush 26R comes into contact with the R pattern 24a by the notch 25b. The detection vehicle 24
Since it was divided into 16 parts, 16 x 2 = 32, 1 in 32 positions
The R brush comes into contact with the R pattern each time. Common brush 26
The + potential common to the R pattern 24r and the TP pattern 24a is applied to c. The detected T pulse and t pulse waveforms are likely to cause chattering due to vibrations of the T brushes 26T and t brushes 26t and contact resistance between the T brushes 26T and t brushes 26t and the TP pattern 24a. Therefore, a countermeasure method is adopted in which the rising edge of the leading edge 35a of the pulse 35 is recognized and the waveform is controlled by the shaped waveform corrected to the rising and falling pulses. The shaping waveform rises at the leading edge 35a of the rising edge of the T pulse of the potential difference between the T brush 26T and the common brush 26c, and falls at the leading edge 35a of the rising edge of the t pulse by the t brush 26t and the common brush 26c. Created on the side and controlled by this shaped waveform. Shaped waveform with rising R pulse
TP0 is set so that the character position 31 (or 63) of the character belt 14 faces the lowest digit position, and the character belt 14 is stretched between the drive pulley 9 and the driven pulley 19. The electromagnet energization waveform is controlled by the rising edge of the leading edge 35c of the shaped waveform. The leading edge 35c of the shaped waveform is energized to the electromagnet at the rising edge of the leading edge 35c, and the leading edge 3 of the next shaped waveform 3
Shut off at the rising edge of 5c. The fastest mode for continuous printing is a mode in which the leading edge of TP0 energizes, the leading edge of TP1 shuts off, the leading edge of TP2 energizes, and the leading edge of TP3 shuts off, as shown in FIG. This embodiment is a cycle machine that prints one digit to the most significant digit for printing one line and finishes the paper feeding process.
Therefore, if the desired print is 7 digits, it is necessary to selectively print space digits from the 8th digit to the most significant digit. When this printer is used as a calculator, printing to the most significant digit is rarely required, and the printer is required to have a high printing speed. Therefore, many space positions are installed on the type belt 14 as a means to increase the printing speed. Next, the type selection mechanism will be described.

<Type selection mechanism> Explanation will be given with reference to FIGS. 1 to 3, 6, and 19.
The motor 2 fixed to the injection-molded frame 1 by utilizing the elasticity of the frame 1 rotates in the arrow A direction. The reduction gear 4 rotates in the arrow B direction and the transmission gear 5 rotates in the arrow C direction via the motor gear 3. The sun gear 22 rotates in the direction of arrow D and the planetary gear 23 rotates in the direction of arrow E in response to the rotation of the transmission gear 5. FIG. 6 (9) is an explanatory diagram of the differential mechanism in which the electromagnet is not energized. The planetary gear 23 rotating in the arrow E direction applies a rotational force to the print switching gear 10 in the arrow H direction from the internal teeth 10a of the print switching gear 10, but the claw 7a of the selection claw 7 is the opening 10b of the print switching gear 10. To prevent rotation of the print switching gear 10. As a result, the planetary gear 23 revolves in the arrow F direction along the inner teeth 10a, and the drive pulley 9 rotates in the arrow F direction. The drive pulley 9 is the above-mentioned <configuration of the type belt>
As described above, there is the groove 9b that meshes with the belt tooth portion 14b of the type belt 14, and the type belt 14 is reliably rotated in the arrow G direction without slippage. The driven pulley 19 serves to reduce the load so that the type belt 14 can be smoothly rotated, and to cause the type belt 14 to run parallel to the platen 17. When the drive pulley 9 rotates, pulses are detected by the T brush 26T, t brush 26t, common brush 26c, and R brush 26R of the detection brush 26 as described in <Detection of timing pulse>, and the desired type belt 14 is applied to the desired printing portion. When the printed character portion 14a reaches, the energizing signal is sent to the electromagnet 6. FIG. 6B is an explanatory diagram of the differential mechanism when the electromagnet 6 is energized. Electromagnet 6
When electricity is applied to the suction plate 33, a force in the direction of arrow K is generated on the suction plate 33. The selection claw 7 applies a force to the operating portion 7c that is in contact with the suction plate 33, 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 L by the coil spring 8 and the moment of the friction load 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 pulley 9 rotating in the direction of arrow F, collides with the ratchet end surface 9b, and the drive pulley 9 stops rotating. The planetary gear 23 rotatably attached to the drive pulley 9 stops the revolution revolving around the sun gear 22 and changes to a rotation motion rotating in the arrow E direction. On the other hand, the print switching gear 10
Means that the selection claw 7 is rotated in the direction of the arrow M and the claw 7a is opened 10b.
Since it is disengaged from, it can rotate. The print switching gear 10 is
The rotation of the planetary gear 23, which is rotating in the direction of arrow E, whose revolution has been stopped, is received by the internal teeth 10a and rotates in the direction of arrow H. Opening 1
The claw portion 7a of the selection claw 7 disengaged from the 0b is the outer peripheral portion 10c of the cam.
Pressure contact. The gear 11b of the worm 11 engaged with the gear 10d provided on the outer periphery of the print switching gear 10 causes the worm 11
Rotates in the direction of arrow I. The number of teeth z10 of the gear 10d of the print switching gear 10 is set to an integral multiple of the number of teeth z11 of the gear 11b of the worm 11, and the number of openings 10b of the print switching gear 10 is set to z10 / z11. In this embodiment, z10 = 48 and z11 = 12 are set.
When the worm 11 makes one revolution, 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 L by the coil spring 8 is in pressure contact with the cam outer peripheral portion 10c of the rotating print switching gear 10, and when the next opening 10b comes, the arrow L is generated. Rotates in the direction and engages with the opening 10b. The engagement between the locking portion 7b and the ratchet 9a of the drive pulley 9 is released, and the suction plate 33 is moved in the arrow W direction. The print switching gear 10 stops rotating, the planetary gear 23 starts to revolve in the arrow F direction, and the drive pulley 9 rotates in the arrow F direction. The type belt 14 starts to rotate and returns to the standby state waiting for the energizing signal to the next electromagnet 6. Next, the printing mechanism will be described.

<Printing mechanism> FIG. 4, FIG. 7 to FIG. 9, FIG. 12 to FIG. 14, and FIG.
This will be described with reference to FIG. FIG. 14 is a perspective view of the print drum 12, FIG. 13 is a perspective view of the unit of the hammer 13, FIG. 7 is a sectional view of a standby state before the start of printing of the first digit, and FIG. 8 is printing of the first digit. Cross-sectional view of the process, Figure 9 is a cross-sectional view of the standby state after printing the first digit, Figure 12 is a state diagram of the home position brush at the standby before the printing of the first digit, Figure 12 is the end of printing the first digit The state diagram of a home position brush after is shown.
The hammer 13 is composed of a pressing portion 13e, an elastic portion 13c, and a connecting portion 13d and is integrally formed of plastic, or only the elastic portion 13c is insert-molded by a metal spring material. The number of hammers 13 is the number of print digits, and they are connected by connecting portions 13d, and the connecting portions 13d are fixed to the frame 1. First digit printing will be described. A home position cam 12d provided on the side surface of the print drum 12 pushes down a home position brush 26H elastically deformed by a conductive material such as nickel silver in the direction of the arrow X to bring it into contact with the common brush 26a to generate a print drum home position signal. By confirming this signal, it is confirmed that the print drum 12 is at the first digit print standby position. When the desired type portion 14a of the type belt 14 arrives at the first digit, an energizing signal is sent to the electromagnet 6. As described above in the <type selection mechanism>, the worm 11 is rotated by the rotation of the print switching gear 10.
The worm tooth 11a is composed of a tooth tip 11e, a circumferential projection 11c, and a spiral projection 11d. FIG. 19 is a relationship diagram between the worm teeth 11a and the pin 12c in the standby state. Solid lines are worm teeth 11
Exploded view of a. The alternate long and short dash line is a perspective view of the worm tooth 11a.
During standby, the circumferential projection 11c of the worm tooth 11a is printed on the printing drum 12.
It is located between the pins 12c in the movement locus of the pins 12c, and controls the rotation of the printing drum 12 with its own sword. The gap s3 with the lower pin 12c is made larger than the gap s1 between the circumferential protrusion 11c and the lower pin 12c so that the tooth tip 11e of the worm tooth 11a does not collide between the pins 12c. A gap s3 is provided between the portion 11e and the upper pin 12c. When the worm 11 rotates, the tooth tip 11e enters the locus of the center 12c before the circumferential protrusion 11c that controls the rotation of the print drum 12 separates from between the pins 12c. Circumferential ridge 11c
Move away from the locus of pin 12c, and then pin 12c turns into a spiral ridge.
The print drum 12 is lifted by the upper surface 11f of 11d and rotates in the direction of arrow O. The print claw portion 12a installed on the circumference of the print drum 12 has an arrow U on the back surface 13b of the pressing portion 13e of the hammer 13.
Type belt 1 that is pushed out in the direction and the pressing surface 13a is stopped
The belt tooth portion 14b of 4 is pressed to press the print character portion 14a against the printing paper 16. When the print drum 12 further rotates in the direction of arrow O, the back surface 13b of the pressing surface 13e and the print claw portion 12a sliding on the back surface 13b are disengaged, and the elasticity of the elastic portion 13c of the hammer 13 causes the hammer pressing portion 13e to move. It moves in the direction of arrow V and is returned to the standby position. On the other hand, the home position brush 26H made of an elastic body
The home position cam 12d of the print drum 12 that has been elastically deformed and is in contact with the common brush 26a rotates in the direction of the arrow O and is disengaged from the home position brush 26H. The disengaged home position brush 26H moves in the direction of the 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 cut off during the printing of the first digit (see FIG. 18). The character selection and the printing operation described above in <Type selection mechanism> are repeated from the second digit to the most significant digit. When printing is not required, the space type is selected and printed from the type position on the type belt 14. FIG. 21 is an enlarged view of the printed state. FIG. 20 is a partial detailed view for explaining the print 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 a 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 from the lower part of the printing area 34 of the area through which the character portion 14a passes during printing to the vicinity of the upper end 34a of the printing area 34 is projected from the frame 1. The comb teeth 15 are arranged between the print area 34 and the adjacent print area. This will be explained with reference to FIG. The alternate long and short dashed line indicates the standby position. Hammer 13 for each print digit is print drum 12
Is pushed out serially, the hammer 13 moves in the direction of arrow U, and presses the type portion 14a against the printing paper 16 via the type belt tooth portion 14b. Since the ink is applied to the printing portion 14a by the ink roll 20, the ink is transferred to the printing paper 16. Since the distance s between the comb teeth 15 and the printing paper 16 is longer than the type height m of the type portion 14a, the connecting portion 14 of the type belt 14
c is deformed by the comb teeth 15. Type 1 on both sides of the print digit
The gap 4a is secured without approaching the print paper 16 for a certain distance or more. If the thickness t of the comb teeth 15 is larger than the height m of the character 14a, it is more reliable. Therefore, the printing unit 14 in the printing process
The structure is such that the printed characters 14a on both sides of a do not contact the printing paper 16. Next, the paper feeding mechanism will be described.

<Paper feed mechanism> The paper feed mechanism will be described with reference to FIGS. 10, 11, 12, and 18.
FIG. 10 is a cross-sectional view of the print drum after printing the most significant digit.
FIG. 11 is a cross-sectional view during sheet feeding. The print drum 12 has a print claw portion 12a having a maximum print digit number of 13 digits. Printing drum 1
There are 15 pins 12c on the end face of 2, and the printing drum 12 has a mechanism in which the worm 11 makes one revolution in 15 steps.
Two steps are used for paper feeding. When the print drum 12 rotates in the direction of arrow O to print the highest order digit (13 digits), the fan-shaped paper feed drive gear 12b provided on the side surface of the print drum 12 rotates in the direction of arrow O and becomes the paper feed gear 28. Rotate until just before meshing. After the printing of the highest digit (13 digits) is completed, the drive pulley 9 rotates and the process proceeds to the selection step. When the energizing signal waveform is applied to the electromagnet 6 at an arbitrary position, the worm 11
Rotates, the printing drum 12 rotates in the direction of arrow O, and the paper feed drive gear 12b also rotates in the direction of arrow O. (Because the print drum 12 does not have the print 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. On the paper feed gear 28, a feed roller 29 made of a material such as rubber or soft resin having a diameter larger than the tooth outer diameter of the paper feed gear 28 is fitted on the concentric shaft, or is formed by two-color molding (insert molding). . Feeding roller 29
Also rotates in the direction of arrow Q. The printing paper 16 pressed against the pressing roller 18 to which the force due to the elastic deformation of the feeding roller 29 and the pressing shaft 21 is applied, is fed by friction in the arrow R direction. In this embodiment, a desired paper feed pitch is obtained by a paper feed operation performed twice. Therefore, the signal is again applied to the electromagnet 6 to perform the paper feeding operation, and the print drum 12 returns to the standby position before the first digit printing in FIG. 7 and the print cycle for one line is completed.
Home position cam 12d is home position brush 26H
Is pressed down in the direction of arrow X and brought into contact with the common brush 26a. FIG. 18 is a time chart diagram in which an energization signal is applied to the electromagnet 6 in the shortest paper feed signal. Then, when printing the next line, the above series of operations may be repeated.

〔The invention's effect〕

According to the present invention as described above, the ink roll is
Since the outer circumference of the flange is almost the same as the print height, the behavior of the ink roll will be uniform even if the print height is different, such as when there is no print. The smoothness prevents the printed characters from being chipped and the printing quality is greatly improved.

Further, when the contact area of the type is small, the ink roll is not moved to the type belt side by the flange, and the surface thickness of the ink roll does not rise extremely. Therefore, the amount of ink applied is too large. Ink bleeding is reduced and printing quality is improved.

Further, the flange is approximately the same as the outer diameter of the locus of the type character only at the portion corresponding to the type character, and the outer circumference of the flange becomes uneven, so that the ink roller is driven to rotate by the flange, so that the ink impregnated in the ink roller is Is uniformly applied, so that the printing quality is further improved and the practical effect of the present invention is extremely large.

[Brief description of drawings]

An embodiment of the present invention is shown in FIGS. 1 to 21. FIG. 1 is an exploded perspective view of the printer of the present invention. FIG. 2 is a schematic configuration diagram of the printer as seen from a plane. FIG. 3 is a sectional view of the switching mechanism section. FIG. 4 is a schematic sectional view. FIG. 5 is a back sectional view for explaining the relationship between the detection wheel and the brush. FIGS. 6A and 6B are explanatory views of the differential mechanism. 7 to 9 are explanatory views showing the printing operation.
10 to 11 are explanatory views showing the paper feeding operation. 12 (a) and 12 (b) are explanatory views of the pom position signal. Figure 13 is a perspective view of the hammer. Figure 14 is a perspective view of the print drum. FIG. 15 is an explanatory plan view of a type belt. Fig. 16 is a type layout diagram of the type belt. Figures 17 and 18 are time charts. Figure 19 shows the relationship between the print drum and the worm. FIG. 20 is a partial detailed view for explaining the positions of the comb teeth. FIG. 21 is an enlarged view of the type belt in the printing state. FIG. 22 is an explanatory view of a conventional driven pulley. 1 …… frame 6 …… electromagnet 7 …… selection claw 9 …… driving pulley 10 …… print switching gear 11 …… worm 12 …… printing drum 13 …… hammer 14 …… type belt 15 …… comb teeth 16 …… Printing paper 17 …… Platen 19 …… Driven pulley 19a …… Convex shape part 20 …… Ink roll 22 …… Sun gear 23 …… Planet gear 24 …… Detection wheel 25 …… R detection cam 26 …… Detection brush 28 …… Paper feed gear 29 …… Feed roller 33 …… Suction plate 40 …… Driven pulley 41 …… Ink roll shaft

Claims (2)

[Claims] 1. A loop-shaped print belt having print characters of different heights arranged at a predetermined pitch on the outer circumference, and a flange around which the print belt is wound to position a direction orthogonal to the rotation direction of the belt. A pulley, and an ink roll that is arranged to face the pulley and applies ink to the print characters, and the outer diameter of the flange of the pulley is the locus of the print characters of the print belt wound around the pulley. A printer having a diameter substantially equal to that of the printer. 2. The printer according to claim 1, wherein the flange has a diameter substantially equal to an outer diameter of a locus of the type character only at a portion corresponding to the character type.