JPS59182765A - Multi-stage type printer - Google Patents

Abstract

PURPOSE:To obtain a multi-stage type printer capable of increasing the speed of printing and having a high reliability by using a system in which a paper feeder is operated only when the operation of printing and carrying means is stopped and a shifter is operated. CONSTITUTION:A paper feeding roller 14 is turned through a control gear 22 by the on-off control of a first solenoid 18 and a second solenoid 42. The shifting operation of type belts 3a and 3b is made through a shift gear 43 by the on-off control of the second solenoid 42, and a carrying cam 41 is turned through a printing-carrying gear 9 by the on-off control of the first solenoid 18. Only when the operation of the printing-carrying gear 9 is stopped and the shift gear 43 is operated, the paper feeding roller 14 is operated and thereby the paper feeding operation can be made with proper timing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a serial printer, and more particularly to a multistage printer having a group of typefaces arranged in multiple stages along the paper feeding direction of printing paper.

Recent calculators have become more multi-functional and sophisticated, as well as smaller and lighter.There is a desire for calculators with printers that can save calculation results as printed data to be smaller and lighter as well. Therefore, it is desired that the printer built into this device be small and lightweight, and consume low power. In addition, as a printer built into this kind of electronic equipment used in general households, easily available and inexpensive 38m++ width or 5.
Since roll paper made of 8W wide plain paper can be used and the printed data is clear, a boat-shaped printing type is desired, and it is also expected to be inexpensive since it requires fewer driving sources.

Next, a serial printer according to an embodiment of the present invention will be explained in detail with reference to the drawings. First, the general configuration of the printer will be described.

[Schematic configuration]

FIG. 1 is a schematic diagram of the printer. A driving pulley 1 and a driven pulley 2 are arranged at a predetermined interval,
In the meantime, two endless type bells (3a, 3b) as shown in Figure 2 are arranged in upper and lower tiers, and the hooks are crossed. A worm 5 is attached to the rotating shaft of one DC motor 4 serving as a drive source, and the driving force of the motor 4 is transmitted to a main gear 8 via a first idle gear 6 and a second idle gear 7. The rotational force from the main gear 8 is applied to the driving pulley IK via a spring clutch (not shown).
The main gear 8 is configured to be able to mesh with a print/carry gear 9.

One end of the printing/carrying shaft 1o is connected to the printing/carrying gear 9, and this printing/carrying shaft 1o is arranged between the driving pulley 1 and the driven pulley 2, and is parallel to the type belt 3. It extends to A hammer holder 1 is attached to the print/carry shaft 10.
1 is attached so as to be slidable in the axial direction, and has a built-in and supported hammer and carry cam as described later. One end of a holder return spring 12 is connected to the hammer holder 11, and the other end of the spring 12 is fixed to the base. Therefore, the hammer holder 11 is always moved to the Baum position side near the driven pulley 2 due to the tensile force of the holder return spring 12. Elastically biased.

Print/carry axis] Near 0, there is a rack 13 parallel to it.
are arranged so that the carry cam built in the hammer holder 11 and the rack teeth of the rank 13 can mesh with each other as described later. A paper feed roller 14 and a flat guide plate 15 that also serves as a platen are disposed behind the rack 13, and the paper 16 is sent out from below the paper feed roller 14 and the guide plate 15 to a position near the outside of the type belt 3. will be guided to. A selection lever 17 is operated by a first electromagnetic solenoid 18 to switch and transmit the rotational force of the main gear 8 from the drive pulley 1 to the print/carry gear 9 at a predetermined timing. Each type bell) 3
An ink roller 20 impregnated with and holding ink is in elastic contact with the type portion 21 (see FIG. 2) on the outer peripheral surface of the letters a and 3b.

FIG. 3 is a diagram showing the arrangement of the printed characters on the printed bells 3a and 3b. upper print bell) as shown in the figure)
3a and lower type bell) 3b have the same type of type, but their arrangement positions are 8 in the circumferential direction and are slightly shifted from each other. By arranging the type in this manner, it is possible to reduce the loss time for character selection as much as possible.

Next, the power transmission system of the entire printer will be explained.

[Power transmission system]

FIG. 4 is a flowchart showing the power transmission system from the DC motor 4. As shown in the figure, the type belt 3 is driven via the drive pulley 1 by turning on and off the first electrode solenoid 1'8. Carry cam 4
The 10 rotations are performed via the print/carry gear 9 and the like by on/off control of the first electromagnetic solenoid 18.

The paper feed roller 14 is rotated via the control gear 22 and the like by turning on and off the first magnetic solenoid 18 and the second electromagnetic solenoid 420. In addition, the shift operation of the type bell) 3a, 3b is performed by the second electromagnetic solenoid 42.
This is done through the shift gear 43 and the like by 0 on/off control.

The series of basic operations of this printer are type selection operation,
The printer consists of a numeral shift operation, a print/carry operation, a paper feed operation, and a hammer holder return operation, and by sequentially repeating each of these operations, a large number of lines are printed.

Next, the type selection mechanism will be explained.

[Type selection mechanism]

First, the drive mechanism for the type belt 3 will be explained. As described above, the driving force of the motor 4 is transmitted to the main gear 8 via the worm 5, the first idle gear 6, and the second idle gear 7. Furthermore, in order to transmit the driving force of the main gear 8 to the driving pulley 1 or to cut off the drive transmission, a known spring clutch (not shown) is provided between the main gear 8 and the driving pulley 1. is mediated.

A code disk 25 (see FIG. 2) is disposed coaxially below the main gear 8, and eventually rotates synchronously with the drive pulley 1.

The state in which the spring clutch can transmit power (0N)
Kt, the power is transmitted from the main gear 8 to the drive pulley 1, or the spring clutch is set to a state in which power cannot be transmitted (OF''F), the rotation of the drive pulley 1 is stopped, and the main gear is Print the driving force of 8.
The aforementioned selection lever 17 switches the power transmission, such as transmitting the power to the carry gear 9 and rotating it. When the spring clutch is turned on by operating the selection lever 17 and the driving pulley 1 is rotated in the direction of the arrow ' as shown in FIG. 1, the type belt 3 is transported in the direction of the arrow.

Although not shown, a conductive pattern having a predetermined pattern shape is formed on the lower surface of the code disk 25 to detect the rotation angle of the driving pulley 1, in other words, the amount of movement of the type belt 3. Furthermore, a plurality of contact pieces including a set contact piece, a reset contact piece, and a common contact piece are in elastic contact with this conductive pattern. These contact pieces are connected to a control section (not shown) by lead wires.

A code plate tooth part 26 is provided on the upper part of the code disk 25, and a spur gear part 28 of the sensor gear 27 meshes with the code plate tooth part 26. The number of teeth of the code plate tooth portion 26 on the code disk 25 is equal to the number of teeth of the pulley tooth portion 24 on the drive side gooley 1.

Further, the number of teeth of the spur gear portion 28 in the Senna gear 27 is as follows:
It is equal to the total number of characters in one set of character groups (symbol group, ten digit group, ten digit group) on the type belt 3. Therefore, while the sensor gear 27 makes one revolution, the type belt 3 makes exactly half a revolution.

A control gear 22 is arranged next to the sensor gear 27, and its shape will be explained with reference to FIG. 5. Same figure (
A) is a plan view of the suppression gear 22, and (b) is a plan view of the control gear 2.
2, the same figure (C) is a sectional view on the harbor line of Fig. 5 (B), the same figure) is a sectional view on the 2-2 line of Fig. 5 (B), and the same figure (E) is a paper feed FIG. 3 is a developed view of the cam part.

A single gear 23 having one tooth in the circumferential direction is provided at the top of the control gear 22, and a spur gear 29 having a toothless part 24 is formed below it. It can mesh with the spur gear portion 28 of the center gear 27. Below the spur tooth portion 29, as shown in the same figure, a locking projection 3o is provided to protrude outward, and the right claw portion 32 of the rotating lever 31 engages with the locking projection 3o. There is.

Below the locking protrusion 30, two paper feed cam parts 33a and 33b are provided that extend spirally along the circumferential direction, and as shown in FIG. 5(b), the starting end of the paper feed cam part 33a A toothless portion 34 is formed between the paper feed cam portion 33s and the terminal end 33e of the paper feed cam portion 3b. A non-circular fitting hole 35 is provided in the center of the control gear 22, and as shown in FIG. It is set up. As for the spring hook, one end of a tension spring (not shown) is hung on the pin 36, and the control gear 22 is always urged to rotate in one direction by this spring.

As shown in FIG. 2, there is a resetting plate 3 above the control gear 22.
7 is arranged, and a connecting shaft 38 having the same shape as the fitting hole 35 of the control gear 22 hangs down from the center of the lower surface thereof, and this connecting shaft 38 can be firmly fitted into the fitting hole 35 of the control gear 22. This causes the reset plate 37 to rotate together with the control gear 22. One protrusion 39 is provided on the upper surface of the reset plate 37 near the outer periphery, and a locking portion 40 is formed on the outer periphery.

In order to select type, it is first necessary to detect the reference position of the type belt 30. In this embodiment, the rotating lever 3
Immediately after the right claw part 32 of No. 1 is disengaged from the locking protrusion 30 of the control gear 22, the type part 21 of "6" of the second number group on the upper type belt 3a is at the home position of the hammer (described later). The position corresponding to the character belt 30 is configured to be the reference position. When the type belt 3 is in the reference position in this way, each type portion 21 of the upper and lower type belts 3a, 3b from the type portion 21 corresponding to the hammer
Since the distance is known in advance, after the reference position is detected, the movement amount of the type belt 3, in other words, the rotation angle of the drive side gooey 1, can be commanded from the control section by counting the pulse signals of the code disk 25. The type belt 3 can be rotated to a position where the type portion 21 corresponds to the hammer. Incidentally, since the position of the hammer changes sequentially due to the carry, the desired character can be selected by counting the aforementioned pulse signals while taking into account the amount of movement of the hammer. In addition, when this type selection is made, Fig. 7 ((J
As shown in FIG. 2, the upper type belt 3a always faces the hammer 19. Next, the double belt shift mechanism will be explained.

[Belt shift mechanism]

As shown in FIG. 1, the shift gear 43 is in a state in which power can be transmitted from the main gear 8 via the third idle gear 57.

6(a) to 6(a) are diagrams for explaining the shift gear 43, and FIG. 6(a) is a plan view of the shift gear 43, and FIG.
(b) is a vertical sectional view of the shift gear 43, the same figure (c) is a sectional view taken along the line 2-2 of FIG. 6(e) is a sectional view taken along the Hoch line in FIG. 6(b), and FIG. 6(e) is a developed view of the shift cam surface of the shift gear 43.

As shown in Figures (a) and (b), a spring hook protrusion 44 is provided on the upper surface of the shift gear 43, and one end of the tension spring is hooked to this protrusion, so that the shift gear 43 is elastically moved in a predetermined direction. Forced. The upper surface of the shift gear 43 is a shift cam surface 45, and the upper flat cam surface 45a
, the downwardly inclined cam surface 45b, and the downwardly inclined cam surface 45b.
5e and an upwardly inclined cam surface 45d, each of these cam surfaces 45a to 45d is formed continuously in the circumferential direction, and the unfolded state of each of the cam surfaces 45a to 45d is shown in FIG. ing.

Below the shift cam surface 45, a spur gear part 47 having a toothless part 46 is formed, as shown in FIG. - There is one locking protrusion 4 in the circumferential direction below the both military parts 48 as shown in FIG. 6 (E).
9 is provided, and this is a button that can be engaged with the left claw portion 5o of the rotating lever 31.

The shift cam surface 45 of the shift gear 43 is shown in FIG.
, (b), the pin 52 of the shift lever unit 51 is always in elastic contact with the shift cam surface 45 by the tension spring 53.

As shown in FIGS. 2 and 6, the shift lever integrated 51 includes two shift levers 54 whose base ends are supported pivotably and whose free ends extend parallel to each other toward the type belt 3 side, and two 77 levers 54. A connecting plate 55 (see Fig. 2) is installed between the two to rotate the two together, and a part of the upper and lower type bells (3a, 3b) is supported by the free end of the shift lever 54, respectively. It is composed of a holding member 56 that holds the body. The pin 52 is provided at an intermediate position of one of the two shift levers 54 so as to protrude outward.

FIG. 7B) shows a state in which the type belt 3 is in the normal position. At this time, as shown by the imaginary line in FIG.
Although not shown, the one gear portion 48 of the shift gear 43 faces the toothless portion provided on the third idle gear 57, so that the shift gear 43 is held at a fixed position. It's stopped. And the pin 52 is the shift gear 43
is located on the lower flat cam surface 45c, and the shift lever 54 is in a nearly horizontal state, and of the two type belts 3a and 3b held by the holding member 56, the upper type belt 3a is Hammer 19 through paper 16
For example, print the numeric symbol "3" on the upper printing bell 3a facing the
When printing the numerical symbol "3" in the next digit, if you try to print again using the upper type belt 3a, it is necessary to move the upper type belt 3a to the next group of digits, which requires time to select the type. It takes. By the way, if the upper and lower printing bells) 3a and 3b are arranged in a printing arrangement as shown in Figure 3, for example, by moving the printing bells) 3a and 3b a little together, the numerical symbol "9" of the upper printing bell) 3a can be obtained. is hammer 19 (
At this time, the hammer 19 is made to face the numeric signal "3" of the lower printing bell (3b), which has already been carried up by one digit, and if the type belt 3 is then shifted, it is made to face the numerical signal "3" of the lower printing type bell) 3b. The time for character selection is shortened and printing speed is increased.

FIG. 7(b) shows a state in which the type belt 3 is shifted upward. That is, the second electromagnetic lens 42 is excited based on a shift signal from the control section, thereby rotating the rotating lever 31 and disengaging the left side mold portion 50 from the locking protrusion 49 of the shift gear 43. When the lock is released, the shift gear 43 rotates a little due to the tension of the spring, and the first gear part 48 of the shift gear 43 (see FIG. 6) first meshes with the spur gear part of the third idle gear 57, and then As a trigger, the spur gear portion 47 of the shift gear 43 (see FIG. 6e) subsequently meshes with the spur gear portion of the third idle gear 57. Since the third idle gear 57 is constantly rotating due to power transmission from the main gear 8, the shift gear 43 rotates by meshing with the third idle gear 57.

As mentioned before, the shift lever 54 is pulled downward by the tension spring 53, and as a result, the pin 52 is in elastic contact with the shift cam surface 45 of the shift gear 43, so as the shift gaff 430 rotates, the pin 52 moves upwardly to the inclined cam surface. 45d and reaches the upper flat cam surface 45a. By changing the sliding contact of the pin 52 from the lower flat cam surface 45c to the upper flat cam surface 45a, the shift lever 54t is moved by the difference in height between the lower flat cam surface 45c and the upper flat cam surface 45a. The blades are set to 2 (>) and the blades are rotated one after the other. With this rotational movement, the side of the type belt 3 facing the paper 16 is lifted by the two holding members 56, and as a result, the lower type belt 3 is lifted up by the two holding members 56. ) 3b faces umma 19. When the pin 52 is on the upper flat cam surface 45a, a printing operation (detailed operation will be described later) is performed by striking with the hammer 19.

Since the shift gear 43 is meshed with the third idle gear 57, the shift gear 43 continues to rotate, and the shift gear 4
Rotation stops when the locking protrusion 49 of No. 3 engages with the rotating lever 31. At this time, one gear portion 4 of the shift gear 43
8 faces the toothless part of the third idle gear 57, and the incisor part 46 of the shift gear 43 (see FIG. 6(C)) faces the third idle gear 57, and the third idle gear 5° No power is transmitted from 7. Further, the pin 52 slides on the descending inclined cam surface 45b and reaches the lower flat cam surface 45a again, returning to the state shown in FIG. 7(a). In this way, the belt shift operation is performed by the second 'tlL magnetic lens 4.
2 is turned on and the shift gear 43 is rotated.

[Print/carry mechanism]

Next, the printing/carrying operation will be explained. The hammer 19 and the carry cam 41 are housed in the hammer holder 11, and the carry cam 41 is splined to the print number carry shaft 10.

As shown in FIG. 2, the carry cam 41 has a hammer drive part 58 extending in one direction from the center to the outer circumference, a carry protrusion 59 provided along the outer circumference, and a coaster-shaped part. The rack rotation unit 60 is provided for returning the rack to the rack. The carry protrusion 59'' includes a circumferential protrusion extending in the circumferential direction that is formed so as to span about half of the circumferential direction, and a circumferential protrusion that extends in the circumferential direction that is formed over about the remaining half of the circumferential direction. It consists of a spiral protrusion, and both of these protrusions are continuous.

The carry protrusion 59 is adapted to mesh with the rack teeth 61 of the rack 13. The rack rotating portion 60 is configured to abut against a return lever portion 62 provided at the end of the rack 13.

The rack 13 is arranged near the print/carry axis lO in parallel with it so as to be rotatable by a predetermined angle, and as the rack rotates, the rack teeth 61 mesh with the carry protrusion 59 of the carry cam 41, or Figure 8 (h) and (b) are diagrams for explaining the printing operation.
Figure (A) shows the state before printing, and Figure (B) shows the state during printing. In the state before printing, the hammer 19 is pulled rearward by a tension spring and is positioned by a stopper (not shown), as shown in FIG. Therefore, the type belt 3 is located between the paper 16 and the hammer 19 and is slightly separated from the two, and the hammer driving section 58 faces downward and does not come into contact with the receiving section 63 of the hammer 19.

The print/carry shaft 10 rotates in the direction of the arrow by the drive transmitted from the main gear 8, but the return operation of the rack 13 and the printing operation are performed continuously during the first half of the rotation, and the carry operation is performed continuously during the second half of the rotation. It is now possible to That is, when the print/carry shaft 1o rotates in the direction of the arrow, the carry cam 41 also rotates, and at the beginning of the rotation, the rack rotating section 60 kicks up the return lever part 62, thereby returning the rack 13. Then, the rack teeth 61 and the carry protrusions 59 mesh with each other. During this first half-circle, the circumferential protrusion of the carry protrusion 59 meshes with the rack teeth 61, so the transfer of the carry cam 41 (hammer holder 11 and hammer 194) is not possible.
It's just a half-circle on the spot. This carry cam 41
As shown in FIG. 8(B) at 0 half-turn, the hammer driving section 58 comes into contact with the receiving section 63 of the hammer 19, and with the subsequent rotation of the hammer driving section 58, the hammer 19 moves forward against the elasticity of the tension spring. being pushed out. The printing portion 21 of the selected upper type bell (3a) facing the paper 16 is pressed against the paper 16 by the extrusion of the hammer 19, and desired printing is performed. As the carry cam rotates 410 times, the hammer drive section 58
By moving upward, the hammer 19 is pulled rearward by the tension spring, and the hammer 19 is separated from the type belt 3.

When the carry cam 41 continues to rotate, the spiral protrusion of the carry protrusion 59 meshes with the rack teeth 61 (
- With the rotation, the hammer holder 11, hammer 19, and carry cam 41 move toward the upper digit by an amount equivalent to one digit against the elasticity of the hammer return spring 12 (see FIG. 1) and are carried up.

By sequentially repeating the printing operation and the carry operation in this way, the negative portion is printed.

[Paper feeding mechanism]

Next, the paper feeding operation will be explained. As described above, when one line of printing is completed, it is necessary to return the hammer holder 11 to the home position again and to feed the paper in preparation for printing the next line.

As shown in FIG. 2, the paper feed cam portions 33a and 33b of the control gear 22 are adapted to mesh with an intermediate gear 64. The connecting shaft 65 of this intermediate gear 64 is press-fitted into the center shaft hole 66 of the paper feed roller 14, and
It is designed to rotate together with 4.

FIG. 9 is a plan view of essential parts showing a state in which the paper feed cam portion 33 and the intermediate gear 64 face each other. As shown in this figure, before the paper feeding operation is performed, the intermediate gear 64 faces the toothless portion 34 of the paper feeding cam section 33, and the intermediate gear 64 (
Power cannot be transmitted to the paper feed roller 14).

Printing/carrying gear 9 of printing/carrying axis 1o shown in Fig. 2
A lever push-out cam portion 69, which is substantially circular in shape and extends in one direction toward the outside in the radial direction, is provided at the base of the lever. The inner end surface of the rising portion 68 of the gear flanch lever 67 shown in FIG. 2 is in elastic contact with the cam portion 69 by the tensile force of a spring (not shown). gear clutch lever
A protrusion 7o is provided on the other part of the reset plate 3.
It faces the locking portion 4o of No.7.

Figures 10 to 13 show the shift gear 43 in each operation.
- Rotating lever 31 - Control gear 22 and reset plate 3
7 is a diagram showing the engagement relationship with a gear clutch lever 67. FIG.

FIG. 10 shows the state before printing after the upper type bell 3a is selected. In this case, the first electromagnetic solenoid 18
In addition, the second ′ tortoise solenoid 42 is not energized, and therefore the protrusion 7o of the gear clutch lever 67 is separated from the locking portion 4° of the reset plate 37. Further, the rotation lever 31 is urged to rotate by the tensile force of the tension spring 71,
The right claw portion 32 of the control gear 22 engages with the locking protrusion 3o, and the left claw portion 5o engages with the locking protrusion 49 of the shift gear 43, so that both the control gear 22 and the shift gear 43 rotate. do not.

FIG. 11 shows a state in which the upper type belt 3a is selected and a printing operation is in progress. In this case, the first electromagnetic solenoid 18 is turned on, which causes the selection lever 17 (see FIG. 1) to rotate, and the main gear 8 and print/carry gear 9 to mesh with each other. Then, through the print/carry gear 9, the print/carry
The carry shaft 1o rotates, and the printing 2-carry operation is performed as described above. Further, as the print/carry shaft 10 rotates, the gear clutch lever 67 is pushed out by the lever pushing cam part 69 (see FIG. 2), and the protrusion 70 of the gear clutch lever 67 engages with the locking part 4o of the reset plate 37. engage.

On the other hand, since the second electromagnetic lens 42 is in the off state, the right claw 32 of the rotary lever 31 is connected to the locking protrusion 30 of the control gear 22, and the left claw 50 is connected to the locking protrusion 49 of the shift gear 43. , respectively, are locked. Therefore, the control gear 22 does not rotate and no paper feeding operation is performed.

FIG. 12 shows a state in which the lower type bell (3b) is selected and printing is in progress. In this case, the first electromagnetic solenoid 18 is turned on, and based on this, the print/carry shaft 10 rotates as described above. At the same time, the gear clutch lever
67 is pushed out and its protrusion 70 engages with the locking part 40.

After the aforementioned first electromagnetic solenoid 18 is turned on and the protrusion 70 and the locking part 40 are engaged, the second electromagnetic solenoid 42 is turned on.
It's time to turn on. When the 2' tortoise solenoid 42 is turned on, the rotary lever 31 rotates against the elasticity of the tension spring 71, causing its right claw portion 32 to engage with the locking protrusion 30, and the left claw portion 50 and locking protrusion 4
Both engagements with 9 should be released. With this release, the shift gear 43 rotates, and the shift operation of the type belt 3 is performed, and as shown in FIG.
11 printing bell) 3b, and the above-mentioned printing/carrying shaft 1
With the 00 rotation, a printing operation of raising one digit is performed.

In this way, by turning on the first electromagnetic solenoid 18 and then turning on the second electromagnetic solenoid 42, the engagement with the protrusion 70 occurs before the engagement force between the right pawl 32 and the locking protrusion 30 is released. Therefore, the control gear 22 does not rotate and no paper feeding operation is performed.

FIG. 13 shows the paper feeding operation. In this case, the first electromagnetic lens 18 is off, so the gear clutch lens (-67 protrusion 70 & end 'J set plate 37 is locked). 40. In this state, the second electromagnetic solenoid 42 is turned on, and the rotating lever 31 rotates. This operation causes the right side pawl 32 to engage with the locking protrusion 30. , and the left @ll claw portion soh are disengaged from the locking protrusion 49, respectively, and the fljl control gear 22 and the shift gear 43 are in a rotatable state.

When the control gear 22 is in a free state, the control gear 2 is pushed into the trigger groove 72 of the sensor gear 27 shown in FIG.
2 single gear 23 is fitted. Next, sensor gear 2
At 70 rotations, the spur gear portion 28 of the Senna gear 27 and the spur gear portion 29 of the control gear 22 mesh with each other, and the control gear 22 and the reset plate 37 are rotated together.

In a state before the control gear 22 rotates, that is, in a state other than paper feeding operation, the intermediate gear 6 is rotated as shown in FIG.
4 faces the toothless portion 34 of the paper feed cam portion 33. Therefore, at times other than paper feeding operation, the intermediate gear 64 and the paper feeding roller 14 can rotate freely, and the paper 16
Attachment and detachment of the control gear 22 is carried out without any problem, and no displacement of the control gear 22 occurs.

If the intermediate gear 64 is always in mesh with the paper feed cam portion 33 of the control gear 22, the following problems will occur. That is, when the paper 16 is attached to the paper feed roller 14, when the paper 16'' is removed from the paper feed roller 14, or when the paper 16 attached to the paper feed roller 14 is pulled out by a predetermined length, the paper feed The control gear 22 rotates slightly via the roller 14 and the intermediate gear 64. This rotation makes the operation of the control gear 22 biased by the spring unstable. Also, the paper feed roller 14 is braked. Because of this condition, it is difficult to handle the paper 16.

If the paper feed cam portion 33 is provided with the toothless portion 34 that does not mesh with the intermediate gear 64 as described above, even if the paper feed roller 14 and the intermediate gear 64 rotate when handling the paper 16, the control gear 22 does not shift in position, and stability of operation can be achieved.

The toothless portion 34 is set to a size that can sufficiently accommodate the teeth of the intermediate gear 64, and the opening angle θ (9th
(see figure) is approximately 60 degrees.

The sensor gear 27 and the control gear 22 mesh, and the control gear 2
When 2 rotates in the direction of the arrow 5 as shown in FIG. 9, the helical tooth portion 33 of the control gear 22 meshes with the tooth portion of the intermediate gear 64. The rotational force of the intermediate gear 640 is transmitted to the paper feed row 214, and its rotation feeds the paper 16 by an amount corresponding to one direction.

During this paper feeding operation, that is, the protrusion 39 of the reset plate 37
When it has rotated about half a turn, it enters under a tapered cutout (not shown) provided in the rack 13. When the reset plate 37 further rotates, the side of the rack 13 opposite to the rack teeth 61 is pushed up by the projection 390, and the rack 13 is brought down.

When the rack 13 is knocked down in this way, the rack teeth 61
The engagement with the protrusion 59 of the carry cam 41 is disengaged, and the hammer 1
9 and a hammer holder 11 with a built-in carry cam 41
is returned to the home position by the tensile force of the holder return spring 12.

When the control gear 22 rotates once, its locking protrusion 30 engages with the right claw part 32 of the rotating lever 31, and the toothless part 24 [fifth
(see Figure e→)] is opposed to the Senna gear 27, and the protrusion 39 of the reset plate 37 is engaged with the rotation stopper 73 of the fallen rank 130, in preparation for printing the next line.

FIG. 14 is a timing chart showing the shift operation and carry/print operation of the type belt 3. As mentioned before, by turning on the first electromagnetic solenoid 18 and then turning on the second electromagnetic solenoid 42 after a predetermined time, the control gear 22 can be turned on without rotating the control gear 22, that is, without performing a paper feeding operation. Shifting operation of type belt 3 (shift gear 430 rotations and shift lever 540 rotations)
and carry operation in parallel, lower printing bell) 3b
The printing operation is performed while facing the hammer 19. After printing, the shift gear 43 and the shift lever 54 return to their original positions, and the upper type belt 3a faces the hammer 19.

In addition, the pulse corresponding to (a) printed characters in the figure is the code disk 25 (
(see Figure 2), and is used as a reference pulse for each operation.

FIG. 15 is a timing chart of the paper feeding operation and the hammer holder return operation. When paper is to be fed, the first electromagnetic solenoid 18 is kept off, that is, the reset plate 37 is kept rotatable, and the second electromagnetic solenoid 42 is turned on, as described above. Then, the control gear 22 (reset plate 37) rotates, which rotates the paper feed row 214 and starts paper feeding/operation. After a slight delay, the rack 13 is brought down and the hammer holder 11 (hammer 19 and Carry cam 4
1) are returned to the home position.

FIG. 16 is an explanatory diagram showing a modification of the type belt 3. In this example, the type belt 3 is made of one wide belt, and the type portion 21 is formed in two stages, upper and lower, on the outer peripheral surface of the belt. In this case as well, the types of characters are the same in the upper type portion 21 and the lower type portion 21, but the arrangement positions of the type portions 21 are slightly shifted from each other in the circumferential direction.

As described above, the present invention includes printing paper that is fed in a predetermined direction, paper feeding means for feeding the printing paper, and a plurality of character groups arranged in multiple stages along the paper feeding direction of the printing paper. a group of typefaces, a shifting means for shifting the group of typefaces along the column direction of the group of typefaces, and a hammer for pushing one typeface selected from the group of typefaces toward the printing paper side to perform desired printing. a printing/carrying means for pushing out and carrying up the character, and the paper feeding means only when the operation of the printing/carrying means is stopped and the shifting means is operated. and a paper feed control means configured to operate.

By adopting such a configuration, the paper feeding operation can be performed at appropriate timing, and reliability can be improved. Also,
By operating the shift means successively after printing at the final digit, the paper feed operation is immediately and automatically performed via the paper feed control means and the paper feed means, so that the printing speed can be improved.

[Brief explanation of the drawing]

All figures are for detailed explanation of the present invention.
The figure is a schematic configuration diagram of the printer, Figure 2 is an exploded perspective view of the main parts of the printer, Figure 3 is an explanatory diagram showing the type arrangement of the type belt, Figure 4 is a flowchart showing the power transmission system from the motor, and Figure 5 is a flowchart showing the power transmission system from the motor. Figure (A) is a plan view of the control gear, Figure (B) is a longitudinal cross-sectional view of the control gear, Figure (C) is a cross-sectional view of Figure 5 (A), and Figure 5) is a top view of the control gear. Figure (A) is a sectional view taken along the line 2-2, Figure (E) is a developed view of the paper feed cam section, and Figure 6 (
A) is a plan view of the shift gear, FIG. 6(B) is a vertical sectional view of the shift gear, FIG. 2-2 line sectional view, the same figure (e) is a Hoch line sectional view of Fig. 6 (b), the same figure (f)
Figure 7 is a developed view of the shift cam surface in the shift gear, Figures 7 (e) and (b) are operation explanatory diagrams to explain the belt shift operation, and Figures 8 (a) and (b) are operation diagrams to explain the printing operation. An explanatory diagram, FIG. 9 is a plan view of the main part showing the facing state of the paper feed cam part and the intermediate gear, and FIGS. 10, 11, and 12.
Figure 13 is an explanatory diagram showing the engagement relationship between the shift gear rotation lever, control gear and reset plate and gear clutch lever in each operation, and Figure 14 is a type belt shift operation and carry-l: lj FIG. 15 is a timing chart of the character operation, FIG. 15 is a timing chart of the paper feeding operation and hammer holder return operation, and FIG. 16 is an explanatory diagram showing a modification of the type belt. 3.3a, 31)... Type held, 4...
...Direct light motor, 8...Main gear, 9...
...Print/carry gear, 10...Print/carry shaft, 13...Rack, 14...Paper feed roller, 16...Paper , 17... Selection lever, 18... First electromagnetic solenoid, 19.
... Hammer, 21 ... Type section, 22 ...
... Control gear, 31 ... Rotating lever, 33
a, 33b...paper feed cam section, 37...
・Reset plate, 41... Carry cam, 42...
...Second electromagnetic solenoid, 43...Shift gear, 45a to 45d...Shift cam surface, 51
......shift) lever integrated, 54...shift lever-156...holding member, 64...
Intermediate gear, 67... Gear clutch lever - 0 Figure 74 Figure 5 (A)
(c) 731 wo6θ'323"
23”
0” off I21 B figure (Ino 79 figure Taku 35 710 block 711 figure figure +21D

Claims (1)

[Claims] Printing paper that is fed in a predetermined direction, a paper feeding means for feeding the printing paper, a typeface group having a plurality of type groups arranged in multiple stages along the paper feeding direction of the printing paper, and a typeface group. a shifting means for shifting the type group along the column direction; and a shift means for shifting the type group along the column direction, and pressing one type portion selected from the type group to the printing paper side to perform desired printing.
A hammer body, a printing/carrying means for pushing out and carrying the hammer body, and the paper feeding means only when the operation of the printing/carrying means is stopped and the shifting means is operated. 1. A multi-stage printer, comprising: paper feed control means configured to operate.