JPS58112780A - Printer - Google Patents

Abstract

PURPOSE:To simplify a rotating means for a paper-feeding roller and contrive to reduce the size and cost of a printer, by a method wherein a paper-feeding roller is rotated by utilizing a rotating motion of a rack for returning a carriage. CONSTITUTION:While a shift-up and paper-feeding cam 99 is rotated by one revolution, the rack 13 is reciprocated in directions of an arrow E and an arrow G. Concurrently, a paper-feeding ratchet 131 (paper feeding roller) on the driving side is rotated in the direction of an arrow F to establish a stand-by condition for feeding paper, and is subsequently rotated in the directon of an arrow H to push out a paper 16 in the direction of an arrow I.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to printers, and more particularly to serial printers.

Recent calculators have become more multifunctional and sophisticated, as well as smaller and lighter.Therefore, calculators with printers that can save calculation results as print data are also desired to be smaller and more compact. The built-in printer is small and J! It is desired that the power consumption is low and the power consumption is low. In addition, as a printer built into this type of electronic equipment used in general households, roll paper made of easily available and inexpensive 353 mm or 58 mm wide plain paper can be used, and the printed data is clear. -, therefore, it is desired that the image printing type be used, and it is also expected that the number of driving sources is small and the cost is low.

[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,
An endless type belt 3 is passed between them. 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 by the first idle gear 6 and I! 2 is transmitted to the main gear 8 via the idle gear 7. The rotational force from the main gear 8 is applied to the drive pulley 1 via a spring clutch (described later) 1.
The print/carry gear 9 can mesh with the main gear 8.

One end of a printing/carrying shaft 10 is connected to the printing/carrying gear 8, and this printing/carrying shaft 10 is disposed 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 K is attached as will be described later.

The carry and paper feed cams 2 and 9 release levers are supported by built-in components. One end of a holder return spring 12 is connected to the hammer holder 11, and the other end of the spring 12 is connected to the base (
(to be described later), therefore, the hammer holder 11
is always elastically biased toward the home position of the driven pulley 2 by the tensile force of the holder return spring 12.

A rack 13 is installed near the printing fist carry shaft 10 and parallel to it.
are arranged so that the hook teeth of the carry/paper feed deer foot and rack 13, which are PIRed on the hammer holder 11, can mesh with each other as described later. A flat guide plate 15, which also serves as a paper feed roller 14 and a platen, is disposed behind the rack 13, and the paper 16 is fed out from below the paper feed roller 14 and guide plate 15, and is fed to the type belt. It is guided near the outside of 3. IT is a selection lever that switches and transmits the rotational force of the main gear 80 from the drive pulley 1 to the print/carry gear 9 at a predetermined timing, and is operated by the electromagnetic solenoid 18.
is a position detection section provided near the driven pulley 2, which detects a reference position wave for character selection and a character position.

2 (1!: The ink roller contacts the type portion on the outer circumferential side of the type belt 3 and applies ink to the type surface.

The series of basic operations of this printer are type selection operation,
It consists of a print/carry operation and a hammer holder return/paper feed operation, and by sequentially repeating these operations, many lines are printed. Each of the above-mentioned operations and related mechanisms will be explained in detail one by one, but first the configuration of the type belt 3 will be explained.

[Composition of type belt]

As shown in FIG. 3, the type belt 3 has an endless shape 9, and a large number of type parts 21 are individually provided along the circumferential direction at a predetermined pitch on the outer periphery, and on the inner periphery @ A large number of belt teeth 22 are provided along the belt at a predetermined pitch. Each character portion 21 (belt tooth portion 22) and the belt tooth portion 22 are provided in pairs, that is, at the same pitch, so that the character portion 21 (belt tooth portion 22) and the adjacent character portion 21 (
The belt teeth 22) are connected to each other by a thin connecting part 23. These type portions 21. The belt tooth portion 22 and the connecting portion 23 are made of, for example, synthetic rubber or synthetic resin with a low degree of polymerization, and the type belt 3 as a whole has appropriate flexibility, stretchability, and elasticity. As shown, the total length of the type belt 3 is, for example, all
It is divided into three areas: a type group q1, a second fi type group q2, and a $3 type group q3. And for example, the first type group q1 is r+J, r-J,
rXJ, r÷'', memory symbol rMJ, ) −
It is a group of type tubes that are printed less frequently than other numerical symbols such as the tall symbol rTJ, the subtotal symbol "◇", the mitem count symbol "san", various alphabet symbols, and other special symbols.

On the other hand, the WX2 type group q2 and the third type type group q3 are groups that collect one type of type that is frequently printed, such as numerical symbols, etc., and both groups each have the same type of type. The arrangement order of the characters is the same as K. ◎More details will be given later, but the type arrangement on the type belt 3! By doing as described above, it is possible to reduce the loss time for character selection as much as possible.

At the boundary between the character groups Gl and G3, the character part 21 and the belt tooth part 22ri are not provided, and the margin 9! /
When c is pressed, the piece 24 is attached to MR. The push-down piece 24 is made of, for example, polyacetal resin, polyethylene resin,
It is molded from a relatively hard and slippery synthetic resin such as polyamide resin, and as shown in Fig. A notch 25 is formed in the middle for external fitting.

Note that the lower end of the push-down piece 24 has a push-down function, which will be described later.
The type s21 and the teeth of the belt 22 also protrude slightly downward. On the other hand, as shown in FIG. 5, the front surface of the push-down piece 24 is slightly recessed from the front surface of the type section 21, that is, from the type surface, and when pressed down, the member 24 comes into contact with the paper 16 when pushed out by a hammer 66, which will be described later. It's a trap so you don't.

The type belt 3 is made as follows. That is, the sixth
As shown in the figure, a cylindrical type belt body 3a with the same diameter and good width as the type belt 3 is made by molding, and is cut into seven predetermined width dimensions (height dimension of the type belt 3) to form slice type belts. Bell) 3b't-get. Then, the cut portions 25 (see FIG. 4) of the push-down pieces 24 are expanded and fitted into predetermined positions of each sliced type belt 3b, thereby completing the type belt 3. Therefore, the type belt element 3
On the outer periphery of the margin, type portions 21 having a predetermined type arrangement 1 are repeatedly provided in the same arrangement in the width direction, while on the circumference, belt tooth portions 22 are formed continuously in the width direction as protrusions. has been done.

As explained in Fig. 1, the hook is passed between the driving pulley 1 and the driven pulley 2, and the dangerous belt teeth 22 are provided on the circumference 11 of the type belt 30, and the belt teeth 22 are connected to the driving pulley. 1 and the pulley teeth 26 of the driven pulley 2 (see Fig. 2), ensuring no slippage and reliable Kf8.
The belt 3 is rotated. As shown in FIG. 19, the driving pulley 1 is rotated counterclockwise in the figure, and the type belt 3 is rotated in the direction of arrow A, and the driven pulley 2 and the driving pulley 1 on the side facing the paper 16 are rotated. The distance between
A code plate 28 (see FIG. 2), which will be described later, is attached to the pulley shaft 2T of the 0 and 91 dynamic pulley 2 on the side.
This; - door box 28 has various contact pieces 29 for detecting the position of type.
Braking is always applied to the driven pulley 2, such as by being brought into elastic contact with the driven pulley 2. For this reason, the side of the type belt 3 facing the paper 16 does not sag, and even if there is some vibration, the paper 16 does not swing significantly along the feeding direction. Therefore, the accuracy of the printing position when printing is high, and even if the distance between the type belt 3 and the paper 16 becomes narrower as printers are becoming more compact, the type part 21 will not come into contact with the paper 16 unexpectedly. do not have. Next, the type selection mechanism will be explained.

[Type selection mechanism]

First, the driving mechanism of the type belt 3 will be explained in detail with reference to FIG. The base 30 is molded from hard synthetic resin and has a substantially rectangular planar shape, and is provided with a motor mounting recess 31 in the center of the front side thereof, in which the DC motor 4 is installed.

On the left side of the motor mounting recess 31, a pin-shaped gear support shaft 32 and a cylindrical gear support cylindrical body 33 are integrally protruded from the Oitehose 30 at a predetermined distance.
The idle gear 6 has a #I2 idle gear T rotatably fitted onto the gear support cylinder 33. portion 34 and a spur tooth portion 35 that meshes with the second idle gear 7. On the other hand, the second idle gear 1 is formed with a spur tooth portion 36 that meshes with the spur tooth portion 35 of the first idle gear 6 . Therefore, by fitting the idle gear 6 onto the gear support shaft 32 and the second idle gear 7t onto the gear support cylinder 33, the p1 worm 5
The III idle gear 6 and the second idle gear 1 are meshed with each other.

At the rear of the gear support tube 33, there is a bottle-shaped main gear support shaft 3.
The main gear 8, the spring clutch 4o, and the driving pulley 1 are mounted on the main gear support shaft 38, and the increaser support shaft 3
An ink roller 2° is supported at each of the ink rollers 9.

- Determine the shape of the main gear 8 using Figures 7 to 49. 7 is a plan view of the main gear 8, FIG. 8 is a sectional view taken along the line I-I in the irises 7, and FIG. 9 is a view taken in the direction of the I arrow in FIG. 7. Main gear 8 is shown in FIG. Along the axial direction thereof, there are a spur tooth portion 41 that meshes with the spur tooth portion 36 of the second idler gib 7, and a modified bevel tooth portion 42 that meshes with the print/carry gear 9 at a predetermined timing. , and a central cylindrical portion 43.
Since it is used to transmit power to the printing/carrying gear 9 on the 0 main gear 8 tube main gear support shaft 38, its shape etc. will be explained in the [Printing 9 carry mechanism] section below. By fitting externally, the worm 5. meshes with the second idle gear T, and the rotational driving force of the DC motor 4 is generated by the worm 5.
The main gear 8 is transmitted through the first idle gear 6 and the second idle gear 1 so as to be rotationally driven in a constant direction, that is, in the counterclockwise direction in FIG. 1, at a constant speed.

A slurry ring clutch 40 is interposed between the main gear 8 and the drive pulley 1 in order to transmit the rotational driving force of the main gear 8 to the drive pulley 1 or to disconnect the drive transmission. 0 this spring clutch 4
0 is a cylindrical drive arm μ44 as shown in FIG.
Spring fixing tube 45 and type position selection ratchet 4
6 and a fill spring 4T.

One lower end 47m of the coil spring 4T is inserted into the circumference of the spring fixing tube 45, and the other upper end 47b is inserted and locked into the circumference of the drive pulley 1. . The coil spring 47t is tightly wound around the outer periphery of the drive arm μ44 and is in good condition.
It is inserted into the central recess (not shown) of the driving pulley 1 through the central hole of the spring fixing @45 and the central hole of the ratchet 46, and the central cylindrical part 43 of the main gear 8 is inserted into the central recess (not shown) of the driving arm μ44.
It is press-fitted into the circumferential part of the cylinder so that it rotates integrally with the cylinder. At first glance, the next-layer protrusion 48 formed on the circumference of the ratchet 46 engages with a fan-shaped recess (not shown) provided in the central recess of the drive pulley 1. However, the fan-shaped protrusion 48 A small gap corresponding to the loosening angle of the so-called coil spring 41 is provided in the rotation direction between the ring and the fan-shaped recess), and the ratchet 46
The upper tubular portion 49 of the spring fixing tube 45 is tightly fitted into the central hole of the spring fixing tube 45, and the pulley 1 and the ratchet 46 rotate together. This means that they are connected via the coil spring 47'.

A selection lever 17 (described later) is attached to the teeth of the ratchet 46.
When the first claw portion 50 is not fitted, the coil spring 47 is tightened and the main gear 8 and the driving pulley 1 rotate together. When the I11 pawl 50 of the selection lever 17 is fitted into the teeth of the 2-chatch 46 to prevent the ratchet 46 from rotating, the coil spring 47 is immediately loosened, and the rotational driving force of the main gear 80 is transmitted to the drive pulley 1. It will no longer be done.

In order to select type, it is first necessary to detect the reference position of the type belt 30. Next, a mechanism for detecting this reference position will be described. As will be explained with reference to FIG. 1, the position detecting section 19 is provided near the driven pulley 2. This position detection section 19 is shown in FIG.

It is mainly composed of a spherical button 51, an elastic metal piece 52, a code plate 28, and a contact piece block 53. The autopsy button 51 is made of gold M4 and hard synthetic resin, and is located near the shaft hole 54 into which the pulley shaft 21 of the driven pulley 2 is inserted, as shown in FIGS. 2, 10, and 11. , the buttonhole 5 provided on the movement trajectory of the type belt 3
5 is inserted.

Since the tip of the elastic metal piece 52 is disposed below the button hole 55, the button 51 is supported by the elastic metal piece 52, and as shown in factor 10, under normal conditions, the upper part of the button 51 is It protrudes slightly from the top surface. The base end of the elastic metal piece 52 is bent vertically upward to form a metal piece terminal 56t, which is formed on the base 30 as shown by the dotted line and is bent upward from the bottom of the next terminal array #151. Penetrating.

The center hole of the code plate 28 has a pulley shaft 2 of the driven pulley 2.
7 is tightly fitted, so that the code plate 28 rotates together with the driven pulley 2. Although not shown, a conductive pattern having a predetermined shape is formed on the lower surface of the code plate 2B to detect the rotation angle of the driven pulley 2, in other words, the entire amount of movement of the type belt 3. This conductive pattern is formed, for example, by printing or by bonding thin metal plates. The contact piece block 53 is composed of a reset contact piece 5B, a bifurcated common contact piece 59, a set contact piece 60, and a mounting plate 61 which is made by insert molding or the like and is attached with a mounting plate.

The base end of each contact piece 58, 59.60 is bent vertically upward, and the reset terminal 62. Common terminal 63. It constitutes a set terminal 64, which projects upward from the terminal arrangement groove 57 along with the metal piece terminal 56, as shown by the dotted line.

Although not shown, each terminal 56, 62, 63, and 64 is connected to a control unit by a lead wire.

Reset contact piece 58. The tips of the shorter common contact piece 59 and the set contact piece 60 are in elastic contact with the lower surface of the code plate 28, and the longer common contact piece 59 is below the elastic metal piece 52 as shown in FIG. are opposed to each other at a predetermined interval.

As the drive pulley 1 rotates, the type belt 3 moves in the direction of the arrow A (see Figures 1 and 3), and while the button 51 does not pass over the button 51, the button 51 remains elastic as shown in Figure 10. It is supported by the metal piece 52 and slightly protrudes from the base 30 9, and the elastic metal piece 52 and the common contact piece 58 are separated from each other.

When the type belt 3 further works and the push-down piece 24 comes over the button 51, the upper surface of the push-down piece 24 comes into contact with the outer 7 flange 65 of the driven gooey 2, and as a result, 11th
As shown in the figure, the elastic metal piece 520 resists the elasticity of the button 5
1t - The elastic metal piece 52 contacts the common contact piece 59. Due to this contact, there is no instantaneous electrical continuity between the metal piece terminal 56 and the common terminal 63, and the signal causes m It is possible to detect that the printed character belt 3 is at the reference position.

Since the distance of each type part 21 from the type part 21 (or push-down piece 24) facing the hammer 66 when the type belt 3 is at the reference position is known in advance, the type belt 3 is moved after the reference position is detected. 3 move kJ:J! In other words, the rotation angle of the driven pulley 2 is detected electrically by the position detection unit 19
By counting, the type bell) 3t- reaches the position where the type part 21, which is commanded by the control section, faces the hammer 66.
It can be rotated.

The change in the amount of movement of the type belt 3 due to carrying is shown in the 12th graph.
This will be explained in detail using Figures 0) and ←). ←) in the same figure is an explanatory diagram showing the change in the amount of movement of the type belt 3 mentioned above, and the bottom in the same figure is a partial front view of the paper 16 printed by this specific example.

First, the amount of movement of the type belt 3 when the hammer 66 is at the lowest digit as shown by the solid line will be described.

In response to the print start signal), the type belt 3 rotates in a predetermined direction, and as shown in FIG. Assume that the reference position is detected by pressing down. At this time, the counter 66 performs calculation processing, and the position detecting unit 19 counts until the type belt 3 moves by 1, and the symbol "+" is detected.
Printing is performed when the type portion 21 having the shape faces the hammer 66.

The symbol printing operation ends at the lowest digit, and the number is 111! However, if there is a t1 digit phase separation between the symbol digit 61 and the numerical digit 68, as shown in FIG. is clear and very easy to see. Therefore, after the lowest digit is printed, the next higher digit is not printed (details will be described later), and the hammer 6 is applied to the upper digit as shown by the dotted line in Figure 12 (H).
6 will be moved. Therefore, if you want to print the number "3" next, print the $12 type group q2 which is closest to the first type group q1 in the direction of rotation of the type belt 3 (requiring the least amount of movement of the type belt 3). The inserted part 21 of the numerical symbol "3" is selected.

Then, the distance from the printing section 218 that was facing the hammer 66 at the time of detecting the reference position to the printing section 211 selected in the second printing group q2 is added to the distance when the hammer 66 moves two digits from the lowest digit. A specific capacity movement 12 is calculated by the control section.

Then, the position detecting section 19 counts the amount of movement of the type belt 3, and printing is performed when the type portion 21 of the numerical symbol "3" faces the hammer 66.

Furthermore, when it is desired to print the numerical value "3" next, the character portion 21 of the numerical symbol "3" is selected from the third character group q3, which is closest to the second character group q2. Then, from the printing section 218 facing the hammer 66 when detecting the reference position, I! 11# amount which is the sum of the distance to the type part 21 selected in the 3 type character group q3 and the distance that the hammer 66 moves by one digit! are calculated in the same way, and the rotation of the type belt 3 and the printing operation are performed based on the calculation results. In this way, until one line of printing is completed, the printing section 218, which was facing the hammer 66 when detecting the reference position,
The amount of movement of the type belt 3 is calculated each time a type is selected based on the positional reference, but in this case, the amount of movement of 7 to the type part 21 is already calculated when the previous lower digit is selected. Since the amount is small, the amount of movement of the next digit is calculated by adding it.

FIGS. 13 and 14 are diagrams showing other examples of the reference position detection means. The reference position detection means shown in figures g and u is such that when molding the type belt 3vi, a conductive movable contact portion 69 for detecting the reference position is integrally formed of conductive rubber or conductive synthetic resin. The contact portion 69 protrudes slightly downward from the type portion 21, the belt tooth portion 22, etc., and is provided under the rotation locus of the movable contact portion 69 -fc2.
It comes into contact with two fixed contact pieces TOa and 7Qb. Therefore, when the conductive movable contact portion 69 completely passes over the fixed contact pieces 70a and 70b as the type belt 3 rotates, electrical continuity occurs between both contact pieces 70a and 70b, and the type belt 3 reference positions can be detected.

The reference position detection means shown in FIG. 14 has a conductive movable contact portion 69 for detecting the reference position made of a metal piece.
It is attached to a predetermined position on the type belt 3 by caulking. #! Similar to the reference position detection means explained in Fig. 13,
The movable contact portion 69 protrudes slightly downward from the type portion 21 and the belt tooth portion 22 so as to be able to come into contact with fixed contact pieces 70a and 70b spaced apart from each other.

In addition, a reflective or transmissive type 7 sensor can be installed near the type belt 3 to optically detect the reference position IIl and/or the amount of movement of the type belt 3.0th order printing/carrying Let's talk about the mechanism.

[Print/carry mechanism]

As shown in FIG. 2, a solenoid mounting base 71 is protruded from the left side of the motor mounting recess 31 on the front side of the base 300, and the electromagnetic solenoid 18 is connected to the scattering base 11 via a scattering piece γ2.
The 7 actuator T3 of the otfiB solenoid 18 fixed by the otfiB solenoid 18 has a 5-shaped planar shape, and a through hole 74 is formed in the horizontal part provided between the base end 573a and the free end 73b. . On the other hand, an actuator support shaft 15 is protruded from the side of the gear support cylinder 33 of the base 30, and its upper small diameter portion is inserted into the through hole T4, so that the actuator 13 is positioned around the support shaft 15. The actuator biasing spring 16 is loosely fitted into the lower large part of the actuator support shaft 75 which is designed to rotate the foot angle, and one end 768 of it is loosely fitted to the edge of the pace 30 as shown by the dotted line. As shown by the dotted lines at the end 76bU, the base of the actuator 13; The moving shaft IT is fitted into the central recess of the gear support cylinder 33. This selection lever 17 includes a first pawl portion 50 that engages with the type position selection ratchet 46, a W that engages with the print/carry gear 9, a second pawl portion 18, and a free end of the actuator 13. A vertical retainer #119 is provided into which 73b is inserted with some clearance.

Next, the shape of the printing/carry gear 9 will be explained using FIGS. 15 to 17. FIG. 15 is a front view of the printing/carry gear 9, FIG. 16 is a partially cut right side view thereof, and FIG. 17 is a rear view thereof.

In the axial direction of the printing fist carry gear 9ti, the front teeth part 8
0 and the rear tooth part 81 are provided one behind the other, and the front tooth part 8
0 has a missing tooth part 82 in which part 8 is not formed in the circumferential direction (approximately 60 degrees from the center) (see figure 2). On the other hand, the rear tooth part 81 has one missing tooth part 82. As shown in FIG.
It is located at the rear of 2. Although no other tooth portion is provided in the circumferential direction of the rear tooth portion 81, a notch portion 83 into which the @22 pawl 18 of the selection reno-ku 17 is fitted is formed near the rear tooth portion 81. A shaft hole 84 having an oval-shaped front face is formed in the center along the axial direction, and one end of the printing/carrying shaft 10 having an oval-shaped cross section is tightly fitted therein. If there are 9 digits printed above, the rear outer periphery of gear 9 will be marked with the number 1 shown in Figure 2.
As shown in Fig. 6, a circumferential groove 85 is formed, and this circumferential groove 85 is
By fitting the part 85 into a bearing 86 provided on the base 30 and inserting the other end of the print/carry shaft 10 into the bearing 87, the print/carry shaft 10 is rotatably supported on the base 30. As shown in FIG. 2, a spring support pin 88 is horizontally protruded diagonally below the bearing 86, and a gear biasing spring 89 is loosely fitted into the spring support pin 88. That is, the 18th
As shown in FIG. It is in elastic contact with the cam portion 9a adjacent to the circumferential groove 85.

This printing/carrying gear 9 is designed to mesh with the deformed bevel tooth portion 42 of the main gear 8 at a predetermined timing.
As shown in FIG. 7, the deformed bevel tooth portion 42 has radial grooves 90 formed at positions divided into nine equal parts along the circumferential direction, and on the inner peripheral side between the radial grooves 90. Each is provided with teeth.

Next, switching from drive transmission from main gear 8 to drive pulley 1 to drive transmission from main gear 8 to print/carry shaft 10 will be described. Figures 18 (a), (b) and 19
The figure shows a state in which drive is being transmitted from the main gear 8 to the drive pulley 1. In other words, in this state, the electromagnetic solenoid 18 is not energized, so the base of the cutter 73 is shown in FIG. The end 13a is pulled by the actuator 76, thereby causing the actuator 13 to rotate clockwise around the actuator support shaft 75t, and its free end 73b.
The engagement groove T9 of the K rainbow selection lever 17 is pressed toward the front side as viewed in the drawing. This pressing causes the selection lever 17 to rotate counterclockwise about the lever rotation shaft 77, and as shown in FIG. On the other hand, as shown in FIG. 19, the first pawl 50 is separated from the teeth of the character position selection ratchet 46.

Figure 18 (a) and middle of the same figure) are printed 9 digit raising gear 9
indicates that they are in the same position. Note that in FIG. 18, the central cylindrical portion 43 of the main gear 8 is omitted in order to clearly show the state of the print/carry gear 9. That is,
When the second claw portion 78 of the selection lever 17 is fitted into the notch portion 83 of the print/carry gear 9, the toothless portion 82 of the print/carry gear 9 faces the deformed bevel tooth portion 42. The rear tooth portion 81 also does not fit into the radial groove 90. Therefore, the main gear 8 and the print/carry gear 9 have no engagement relationship, and as mentioned above, the first claw portion 50 is below the type position selection ratchet 46, so the rotational driving force of the main gear 80 is It is transmitted to the drive pulley 1 via the spring clutch 40. In this way, the driving pulley 1 rotates in the direction of arrow B in the same manner as the main gear 8, thereby moving the type belt 3, thereby detecting the reference position as described in 7 above, and selecting type based thereon.

A command is issued from the control section to select a designated character section 21, and the electromagnetic solenoid 18 is energized and excited based on the command. This excitation causes the base end 73 of the actuator 73 to move against the elasticity of the actuator biasing spring γ6, as shown in FIG.
The a side is attracted by the electromagnetic solenoid 18, which causes the actuator 73 to rotate counterclockwise and the selection lever 17 to rotate clockwise. This rotational movement causes the second pawl portion 18 of the selection lever 17 to separate from the notch portion 83 of the print/carry gear 9, and the first pawl portion 50 engages with the tooth portion of the character position selection ratchet 46 instead.

As a result, 460 rotations of the ratchet are also prevented, and the drive transmission to the rainbow drive pulley 1 is cut off by the action of the spring clutch 40, so that the selected type portion 21 is moved by the hammer 6.
6 and is held in a closed position.

When the second claw part 78 comes off the cutout part 83 of the printing/carrying gear 9, the elasticity of the gear biasing spring 89 causes the printing 9 carrying gear 9 to move slightly as shown by the arrow C in the figure ←). Rotated. Then, the rear tooth portion 81 is connected to the radial groove 90 of the main gear 8.
When the main gaff rotates 80 times, the rear tooth section 81 is pushed and continues to rotate.The front tooth section 80 then meshes with the deformed bevel tooth section 42, and the rotational driving force of the main gear 8 is used to raise the print position. It is transmitted to the printing/carrying shaft 10 via the gear 9 and rotates in the direction of arrow C.The hammer holder 11 is slidably attached to the printing/carrying shaft 10 as shown in FIGS. 2 and 21. Insertion holes 91.81 through which the printing/carrying shaft 10 can freely rotate are formed in the rear side plates, and a hammer mounting portion 92 extends horizontally from the rear toward the front inside the insertion hole 91.81. A spring hook 93 is protruded from the rear of one of the side plates, and a long groove 94 is cut horizontally in front of the spring hook facing toward the spring hook 93. Lever support portions 95 cut in the shape of “ill” and “0” are formed diagonally downward and forward of the long groove 94 on both side plates, and furthermore, a partition wall portion 96 is suspended in front of the hammer holder 11. This partition wall portion 96
As shown in FIG. 2, a protrusion opening 97 having a size that allows one of the selected type parts 21 to protrude is formed in the middle, and partition wall parts 96 are provided on both sides of the protrusion opening 97. As shown in FIG. 23, if a taper 98 t') is provided inside the partition wall 96 at the end near the ejection port 97, the type portion 21 from the ejection port 97 can be removed.
The protrusion is carried out smoothly.

Below the hammer mounting portion 92 of the hammer holder 11,
A carry/paper feed cam 99 that is spline-coupled to the print 9 carry shaft 10 is built-in. The cam 99 includes a hammer drive section 100 extending in one direction from the center toward the outer periphery;
Carry cam part 102 having one protrusion 101 on the outer periphery
and an elliptical rack rotating section 103 that returns the rank 13 once for paper feeding, and these are integrally formed by molding synthetic resin. FIG. 424 is a developed view of the cam surface of the carry cam portion 102, in which the protrusion 101 has a circumferential protrusion 101 that is provided around half of the circumferential direction, and a circumferential protrusion 101 that extends in the circumferential direction. A spiral protrusion 101b extending spirally is provided around half of the remaining part of the rack 13. It is a trap that meshes with rack teeth 104 provided at equal intervals on one side of the holder.

The hammer 66 is placed on the hammer mounting part 92 with the extrusion part 105't-partition part 969111, and is slidably fitted into the guide groove 107 formed on the upper surface of the hammer holder 11 with the convex part 1062>f projecting upward. A spring hook 108 is protruded from one side of the O-hammer 66.
As shown in FIG. 21, the pin 108 of this spring hook projects outward from the long groove 94 of the hammer holder 11. A tension spring 109 is waved between the spring hook of the hammer holder 11 and the bottle 108, and the L rehammer 66 is moved away from the type belt 3 (backwards). is elastically biased. At the bottom of the bin 108, there is a receiving part 110 on which the carry/paper feed cam 99's number drive part 100 comes into contact once per rotation.
is provided.

FIGS. 25 and 26 are diagrams for explaining the printing operation, with FIG. 25 showing the state before printing and FIG. 26 showing the state after printing, respectively. In the state before printing, as shown in FIG. 25, the hammer 66 is pulled rearward by the tension spring 109, and is positioned by a stopper (not shown). The partition part 96 and the part 6
6 and the extrusion part 105, and is slightly separated from the extrusion part 105.

The secondary hammer drive section 100 faces downward and does not come into contact with the receiving section 110 of the hammer 66.

The print/carry shaft 10 rotates once in the direction of arrow C by the drive transmitted from the main gear 8, but the print production is performed in the first half of the revolution, and the carry operation is performed continuously in the second half of the revolution. When the 0 or print Φ carry shaft 10 rotates in the direction of arrow C, the carry shaft 10 spline-coupled to it rotates.
The paper feed cam 99 also rotates together, but the circumferential protrusion 101a meshes with the rack teeth 104 on the front half circumference.
Carry/paper feed p cam 99 (hammer holder 11 and hammer 6
There is no transport (same as 6, etc.), and it is only making a half-circle on the spot. The hammer drive 11s10 (1, as shown in FIG. 26, the hammer 66
The hammer 66 is pushed forward against the elasticity of the tension spring 109 by the subsequent rotation of the hammer drive section 100. The selected character portion 21 facing the paper 16 is pushed forward by the hammer 66 through its ejection opening 97 and is pressed against the paper 16 to form a desired print. Note that, as shown in FIG. 22, since partition wall portions 96 are provided on both sides of the projection opening 97, unnecessary characters such as side printing are not printed. For printing and digitization, as the cam 99 rotates, the hammer drive section 100 moves upward from the position directly beside 54C as shown in FIG.
When I returned to work at 66, I was pulled backwards by 9.
Hammer placement part 92. The engagement of the convex portion 106 and the guide $11107 and the spring hook are 1 for the engagement of the bottle 108 and the thrower 94.
The rehammer 66 is properly guided.

When the print/carry cam 99 continues to rotate, the spiral protrusion 101b engages with the rack teeth 104, and as it rotates, it resists the elasticity of the hammer return spring 12 and moves the hammer holder 11. Hammer 66° printing, digit is cam 9
9 etc. is moved in the upper digit direction Ca11 (to the left in the figure) by an amount equivalent to one digit, and a carryover is performed.

In this process, one line is printed each time the character selection, printing operation, and digit positioning operation are repeated.

In Figure #I2, a through hole 111 is drilled diagonally below the bearing 86 in the rack holder, and one end of the rack 13 is inserted into the cylindrical portion 1.
12 is rotatably inserted, and the circular arc-shaped rack receiver provided diagonally below the bearing 8T has the cylindrical portion of the other end of the rack 13 rotatably fitted into the recess 114. Positioning is done.

On the back side of the through hole 111 of the rack holder and the recess 114 of the rack holder, there are two arms 116 that rotatably support both ends of the paper feed shaft 115 at the bottom, respectively.A good paper guide is installed at a predetermined interval. FIGS. 30A and 30B are a partial front view showing the shape of the upper part of the paper guide wall 111 and a partial front view of the next paper printed according to a specific example. As mentioned before, if the symbol digit 6T on the lower digit side and the numerical digit 6B on the upper digit side are separated by a predetermined distance, for example, one digit, the symbol digit 67
and the numerical digit 68 can be clearly distinguished and it is very easy to see. Therefore, on the upper part of the paper guide wall 111, printing is performed at a place corresponding to the symbol digit 67.
A mask portion 120 having a width corresponding to one digit is provided between the numeral digit 68 and a narrow printing notch 119 that performs one printing at a location corresponding to the numerical digit 68. and hammer 66
While moving from the symbol digit 61, which is the lowest digit, to the numerical digit 68, which is the next most significant digit, it stops at a position facing the mask part 120, and the same operation as a normal printing operation is performed. Since the printing section 21 pushed out by the printing section 66 comes into contact with the mask section 120, no printing is performed on the paper 16. , Therefore, when selecting a type at this digit position, the type portion 21 slightly before the type portion 1 selected at the next higher digit is selected. Next, the hammer holder return sheet feeding mechanism will be explained.

[Hammer holder return - paper feed mechanism] K1 as mentioned above
When printing for a line is completed, it is necessary to return the hammer holder 11 to the home positioner again to prepare for printing the next line. Although the explanation was omitted in the above [Printing/Carry Mechanism] section, the lever support portion 95 of the hammer holder 11,
Both ends of the 95Kti lock release lever 1210 are rotatably supported. This rack release lever 121 is provided with a receiving pawl 122 that projects upward and a slide protrusion 123 that projects downward.

As shown in FIG. 32, the rack release lever 121 is disposed between the hammer 66 and the rack 13.
(b) In the state before considering the above, the receiving claw 122 is located diagonally below and in front of the type belt 3 at 5 as shown in FIG. On the other hand, the slide protrusion 123 has a hook formed on the upper surface of the rack 13 along its longitudinal direction and is inserted into the groove 124, and as the hammer holder 11 is transferred, the slide protrusion 123 slides in the groove 124. I will do it.

Figure @31 shows the state before starting the hammer holder return. In this state, the position of the push-down part 24 is selected so that it faces the hammer 66, and the push-down part 24
The type belt 3 is also protruding downward, and the receiving claw 1
The upper end of 22 is located slightly above the lower end of push-down piece 24. Normal full-shape operation and opening operation The hammer drive section 100 moves simultaneously in the direction of arrow C, and the push-down piece 24 is pushed toward the paper 16 via the hammer 66t'. With this horizontal movement of the push-down piece 24, the 32nd
As shown in the figure, the rack release lever 121 rotates in the direction of the arrow, and the sliding protrusion 123 of the rack release lever 121
Since the hook of the rack 13 is engaged with the groove 124,
As the rack release lever 121 rotates, the rack 13 is rotated in the direction of arrow E. In this way, arrow E
The rank 13 that has been knocked down in the direction
It remains in a collapsed state until it is rotated back to its original position in step 3. Then, the rack teeth 104 separate from the protrusions 101 of the print/carry cam 99, and the engagement relationship between the rack 13 and the print/carry cam 99 is released. Then, the hammer holder 11 containing the hammer 66, print 0 carry cam 99, and rack release lever 121 starts to return to the home position side along the print carry axis 10 due to the tensile force of the holder return spring 12. As shown in FIG. 2, on the right end of the rack 13, there are two chevrons 11. + A paper feed intermediate lever portion 125 is provided in a protruding manner. On the other hand, l! As shown in Figures 2, 25, and 26, a disk-shaped intermediate stopper part 126 is integrally provided within the end of the rack rotation part 103 in the carry/paper feed deer 599. , in its predetermined position is the rack 13 as shown in FIG.
The hammer holder 11 is formed with a fan-shaped cutout 127 large enough for the paper feed intermediate lever portion 125 to be inserted therethrough.
When the paper feeder 9 returns to the home position side, the end surface of the rack tooth 104 side of the intermediate lever part 125 of the paper feed 9 comes into contact with the outer surface of the intermediate stopper part 126, and
movement is stopped. In this way, the hammer holder 11
is stopped at an intermediate position close to the home position, the rack rotation parts 103 and 2 of the carry middle paper feed cam 99 are stopped at an intermediate position near the home position.
The lever portion 125 of the paper feed center lever of the lever 13 is at a mutually shifted position and does not face each other.

A paper feeding operation is performed in parallel with this hammer holder return operation, and this operation will be explained next. Rank teeth 10 of the mechanical rack 13 shown in FIG.
An engagement pin 128 is provided on the opposite side of the hook 13 so as to protrude in parallel with the axial direction of the two hooks 13. A paper feed shaft 115 is arranged behind this rack 13 and parallel to it, and two rubber bands 1j1 are arranged approximately on the left half of the rack 13 at a predetermined interval.
29t'' is elastically fitted to the outside and a good paper feed row 214 is fixed.

As shown in FIGS. 2 and 33, a driven paper feed ratchet 130 is attached to the right side of the paper feed roller 14, and a drive shaft 130 is supported on the paper feed shaft 115 in an N rotation direction. It faces the side paper feed ratchet 131. As shown in FIG. 33, a drive-side paper feed ratchet 131U is inserted between it and one arm 116, and due to the elasticity of the ratchet biasing spring 132, the driven-side paper feed cutter is inserted. 30.
! -Always biased in the direction of convergence. Figures 2 and 3
As shown in FIGS. 4 and 35, a side surface of the drive-side paper feed shirachette 131 partially protrudes, and there is a bin groove into which the engagement bin 128 of the rack 13 is rotatably fitted horizontally. 133 is provided. Further, as shown in FIG. 35, a driven roller 134 is disposed diagonally above the paper feed roller 14 to rotate with it, and the paper 16 is held between the paper feed roller 14 and the driven roller 134. has been done.

FIG. 34 shows the state 1!1 meeting before paper feeding is started. In this state, type selection or printing 0 carry operation is being performed, and rack 13 and carry operation are being performed.
When the rack 13 is rotated in the direction of the arrow E to the gill shown by the solid line in FIG. 35 during the hammer holder return operation as described above, the retaining pin 128 and the pin groove 133 are engaged with the paper feed 9 cam 99. As a result, the drive-side paper feed sirachet 131 moves at a predetermined angle K11P in the direction of arrow F, as shown by the solid line, with the paper feed shaft 115 as the center! 1llJ. In this rotation in the direction of arrow F, the driving side paper feed ratchet 131 and the driven side paper feed ratchet 130 have tooth shapes that do not mesh with each other, and when the two claws 13 are fully collapsed, they will be as shown in FIG. 35. Pin groove 13 of drive side paper feed sirachet 131
3 is stopped facing slightly upward and is in a waiting state for paper feeding.

On the other hand, when the rack 13 rotates, the two racks 13
04 and the carry/paper feed cam 99 will be disengaged,
The hammer holder 11 quickly returns to the home position due to the tensile force of the voice holder return spring 12 mentioned above. In addition, when the seventh hammer holder 11 returns to the home position from the lower digit, the carry/paper feed cam 99 When the paper holder 11 reaches the vicinity of the home position in the middle of approximately % rotation of the remaining paper, the carry/paper feeder JI% intermediate stopper part 126 stops the paper feeder part 125 of the rack 13.
# on the side! Since the rack rotating part 103 and the paper feed intermediate lever part 125 are in contact with each other and are shifted in position, the rack 13 is not scraped up by the rack (9) moving part 103, and therefore, as shown in FIG. The tilted state of the rack 13 and the standby state of the drive-side paper feed 9 ratchet 131 are maintained until t. Then, when the carry/paper feed p cam 99 completes one rotation, the fan-shaped cutout portion 127 of the intermediate stopper part 126 is removed from the paper feed intermediate lever part 125 of the two levers 13.
At this time, the hammer holder 11 can completely return to its home position.

As mentioned above, K for hammer holder return.

When the print/carry shaft 10 completes one revolution (at this time, the electromagnetic renoid 18 is already in the de-energized state), it is energized by the tensile force of the actuator biasing spring 16 as shown in FIG. 18 (a). The second claw part T8 of the selection lever 11 falls into the notch part 83 of the printing/carrying gear 9, so that the printing/carrying gear K is
The carry gear 9 (print/carry shaft 10) is stopped from rotating and becomes stationary. At the same time, the first pawl 50 of the selection lever 17 engages with the teeth of the character position selection ratchet 46. When the main gear 8 is released, the rotational driving force of the main gear 8 is transmitted to the driving side boot 91, and the type belt 3 rotates. Furthermore, since the rack teeth 104 of the rack 13 and the carry/paper feed cam 99 are disengaged during this rotation of the type belt 30, there is sufficient time for the hammer holder return as described above. Then, the position of the type belt 3 is selected so that the push-down piece 24 faces the hammer 66, and the electromagnetic lens 18 is energized at the position where the push-down piece 24 faces the hammer 66. As described above, when the print/carry shaft 10 rotates by about %, the rainbow push-down piece 24 is pushed out by the hammer 66 as shown in FIG. 29. The difference from the hammer holder return operation is that since the rack 13 has fallen and the drive-side paper feed ratchet 131 is in a paper feed standby state, the push-down piece 24 simply moves back and forth. On the other hand, at this time, the hammer holder 11 is moved by the tensile force of the holder return spring 12 and has completely returned to the home position. The reed is in a state where it can be engaged (meshed) with the part 125, and then the carry/paper feed cam 9
9 rotates, the rack rotation part 103 abuts against the paper feeding middle barrier bar part 125 (7tJ), and the fallen rank 13 is moved through the paper feeding middle barrier bar part 125 to the 35th rank.
It rotates in the direction of arrow G as shown by the dotted line in the figure. With this rotation, the rack 13 returns to its original position, and the rack teeth 104 engage with the protrusions 101 of the carry/paper feed cam 99, and as the rack 130 rotates, the drive side paper feed 2 check 1
31 rotates in the direction of arrow H. Since the drive-side paper feed ratchet 131 and the driven-side paper feed ratchet 130 have tooth shapes that mesh with each other when rotating in the direction of arrow H, the paper feed roller 14 also rotates in the direction of arrow H. As a result, the paper 16 is pushed out in the direction of arrow 1, and the paper is fed by an amount equivalent to half a line.

When the carry/paper feed cam 99 rotates once, the selection lever 17
The transmission of the driving force is switched, the type belt 3 is rotated, and the position is selected so that the push-down piece 24 faces the hammer 66 again.

Then, while the carry/paper feed cam 99 makes one rotation, the 35th
As shown in the figure, the rack 13 reciprocates in the direction of the arrow E and the direction of the arrow q, and the drive-side paper feed sirachet 131 (paper feed roller 214) rotates in the direction of the arrow F. The feeder is in a standby state, and by continuing to rotate in the direction of arrow H, the paper 16 is pushed out in the direction of arrow H, and the paper is fed by an amount equivalent to the remaining half line.

In this embodiment, the paper is fed by an amount equivalent to one rainbow line by rotating the paper feed roller 214 twice, but for example, by increasing the diameter of the paper feed roller 14, one rotation can feed the paper by one line. It is also possible to feed a corresponding amount of paper.

As shown in FIG. 35, the paper feed roller 14 and the driven roller 1
For example, the paper 16 sent out in cooperation with the 28th
As shown in the figure, the area to be printed next is pushed up through the gap between the guide plate 15 and the paper guide wall 117 so as to face the hammer 66. Paper guide wall 117 as described above
is formed integrally with the pace 30, but the guide plate 15
are formed at the upper rear of both ends of the paper guide wall 111, as shown in FIG. This guide plate 15 is a thick metal plate and also serves as a platen.

The carry/paper feed cam 99 has a horizontal design with as little looseness as possible relative to the print/carry shaft 10.

For example, when using a printer at low temperatures,
There is sufficient time between the return of the machine and the time when the fallen rack 13 is lifted up, the type selection operation, and the time when the hammer holder 11 returns to its home position. Moreover, if the hammer holder 11 (carry/paper feed cam 99) does not return to the home position completely,
Since the mechanism is such that the rack 13 cannot be rotated to the carryable position, the rack 13 rotates while the hammer holder 11 is returning, and the rack 13 and the carry/paper feed 9 cam 99 are connected to each other at the halfway position. There is no possibility that the return movement of the hammer holder 11 will be prevented due to the engagement of the two.

As described above, in the present invention, a rack is arranged so as to be rotatable in a rack for carrying out one carriage return, and a rotational force transmission means is provided between the rack and the paper feed roller, and the rotational movement of the rack is utilized. This is characterized in that the paper feed p-ra is rotated.

With this configuration, the rotating means of the paper feed roller is simplified, and the printer can be made smaller and the cost can be reduced.

[BRIEF DESCRIPTION OF THE DRAWINGS] The figures are all for explaining the printer according to the embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of the printer seen from a plane, FIG. 2 is an exploded perspective view of the printer, and FIG. 3 is an explanatory plan view of the type belt, FIG. 4 is a partially enlarged perspective view of the type belt, FIG. 5 is a partially enlarged plan view of the type belt, and FIG.
The figure is a plan view to explain how to make a type belt.
Fig. 7 is a plan view of the main gear, Fig. 8 is a sectional view taken along the line I-I in Fig. 7, Fig. 9 is a view taken in the direction of arrow H in Fig. 7, and Fig. 10 is a sectional view taken along line I-I in Fig. 7.
Figures 11 and 11 are enlarged cross-sections of the reference position detection unit, Figure 12 (a) is an explanatory diagram showing changes in the amount of movement of the type belt due to carry, and Figure 12 (b) is a printed example. 13 and 14 are partially enlarged perspective views showing other examples of the reference position detection means, and FIGS.
Figure 5 is a front view of the printing/carry gear, Figure 16 is a partially cut right side view of it, and Figure 17! A is its registration map, Figure 18 (a) 2. (B) is an explanatory diagram showing the arrangement of the printing/carry gear, FIGS. 19 and 20 are explanatory diagrams showing the operation of the selection lever, and FIG. 21 is a perspective view of the hammer holder.
FIG. 22 is a partial front view of the hammer holder, FIG. 23 is an enlarged cutaway plan view of the partition wall in the hammer holder, FIG. 24 is a front view of the carry cam portion, FIG. 25 is a side view thereof, and FIG.
The figure is a rear view of it, Figure 27 is a developed view of its cam surface, Figures 28 and 29 are side views of the printing section to explain the printing operation, and Figure 30 (0) is a part of the paper guide wall. front view,
31 and 32 are side views of main parts for explaining the rotating operation of the rack, and FIG. 33 is a paper feeding section. 34 and 35 are explanatory diagrams showing the paper feeding operation. 1°°°゛°° Drive side pulley, 2... Driven side pulley, 3... Type belt, 4... Old DC motor, 8... Main gear, 9... Carry gear during printing, 1o... Printing/carry axis, 11.
... Hammer holder, 13 ... Rack, 1
4...paper feed roller, 15...guide plate, 16...paper, 17...selection lever, 18...electromagnetic solenoid, 19. Old position detection part, 21... Type part, 24...
Push-down piece, 28... Code plate, 29...
・・Contact piece, 4o・・Curve・Spring clutch, 46・・
...Ratchet for character position selection, 5o...
First claw part, 51...button, 52...
Elastic metal piece, 53... Contact piece hook, 66
・Old...Hammer, 67...Symbol digit, 68...
...Numeric digit, 69...Movable contact part, γ0...
...Fixed contact piece, 73... Actuator, γ
8... Second claw part, 96. Old... Partition wall part, 91.
...Ejection port, 99...Carry/paper feed cam, 1oo...Hammer drive unit, 101...
... Projection, 102 ... Carry force section, 103
・・River・Rack rotating part, 104・・・Rack teeth, 11
5...Paper feed shaft, 117...Paper guide wall, 118...Printing notch, 120...
...Mask part, 121...Rack release lever,
122...Receiver claw, 125...Part of paper feed intermediate lever, 126...Part of intermediate stopper, 1
28.Old... Hoai Bin, 11th Sai 3 Diagram "i12th 715 Diagram O 146σ Kori U Seven Hii 9th Go Shihi 2051" 722 F? I +24 Nagi Q Sai213 EiJ 79ote? a+m? Figure 32

Claims (1)

[Claims] To perform a carriage return, a rack is arranged so as to be rotatable, and a rotational force transmission means is provided between the rack and the paper feeder, and the rotational movement of the rack is used to cause the paper feeder to rotate. A printer featuring