JPS63239080A - Serial printer - Google Patents

Abstract

PURPOSE:To facilitate reduction of entire size and weight of a printer, by constructing a serial printer such that single revolution of a spindle is splitted into tree partial revolutions so as to carry out a series of operations, i.e. selection of type, printing, paper feed and reset of type wheel, sequentially. CONSTITUTION:Single revolution of a spindle 48 and a main gear 40 and a main cam member 50 rotatable integrally with the spindle 48 is splitted into three partial revolutions, where the first clockwise rotary angle range is allocated for type selection process, and the second and third rotary angle ranges are allocated respectively for printing process and paper feed process. A pause cam face 50a contactable with a cam follower 51 at the initial position and provides detent function for positioning the main cam member 50, a press cam face 50b having same radius of R1 corresponding to the initial part of type selection process and printing process, a print cam face 50c corresponding to the central part of printing process and a reset cam face 50d having same radius R2 corresponding to the final part of printing process and paper feed process (reset process) are formed on the main cam member 50.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention: Each time a single digit is printed with a single type wheel, the printing paper is fed in the direction of the digit, and one line of money, etc. is printed. The present invention relates to a serial printer applied to a check writer, etc.

[Prior art and its problems 1 This type of printer is a so-called serial type printer, in which a large number of type wheels are arranged on a shaft in correspondence with each digit.
It is classified as a so-called parallel type or simultaneous lever set printer.

The latter parallel type has the advantage of not requiring the printing paper to be moved, but because of the large number of type wheels, it is difficult to reduce costs, the printer as a whole becomes larger, and the number of type wheels increases. There is a problem that the rotational load on the shaft is also large.

On the other hand, as a serial type, a so-called manual rotary set check-like has conventionally been commonly seen, in which a series of operations such as printing operations are performed manually by rotating the type wheel.

However, although this has the advantage of being low in price, it has drawbacks in terms of operability and print quality.

Therefore, a serial type structure has been proposed in which a series of these operations is performed by power drive such as motor drive. For example, one example is disclosed in Japanese Utility Model Application Publication No. 59-41556.

However, in the above proposed configuration, the selection operation of the type wheel,
Since the printing operation and paper feeding operation by hammer drive are each performed by separate power means such as step motors, the internal mechanism and control system are complicated.
There is a problem in that the advantages of the serial type, such as lower cost and smaller size, cannot be fully achieved.

[Object of the Invention] The present invention was conceived in view of the above-mentioned conventional circumstances, and its purpose is to select a type, print, feed paper, and perform printing on a serial type equipped with a single type axis. To provide a serial printer suitable for a check writer, etc., which performs a series of operations including a reset operation for returning a type shaft to an initial state during a feeding stroke by power drive, is inexpensive, easy to miniaturize, and is designed.

[Summary of the Invention] In order to achieve the above object, the present invention basically includes a fixed frame and a printing paper insertion path that is supported swingably relative to the fixed frame and is provided between the fixed frame and the fixed frame. a single type drive morph, a single type shaft rotatably supported by the type wheel, and a single type shaft rotatably supported by the type wheel at a position spaced from the type wheel; a main shaft that is supported and one revolution is divided into three into first, second, and third rotation angle ranges; and a swing frame that supports the main shaft to operatively connect the type shaft and the drive motor via the main shaft. a cam means provided on the main spindle and rotating integrally with the main spindle; a type selection mechanism that performs a type selection operation of the type spindle in a first rotation angle range of the main spindle; a printing mechanism that cooperates with the cam means to swing the swing frame to perform a printing operation by the type shaft in a second rotation angle range following the rotation angle range; a paper feeding mechanism that cooperates with the cam means in a third rotation angle range to carry out a paper feeding operation along the digit direction of the printing paper inserted into the printing paper insertion path. We are proposing a printer.

In the configuration of the present invention described above, each operation of type selection, printing, and paper feeding can be performed using a single drive motor as a power drive source. One rotation of the main shaft installed between the main shaft is divided into three rotation angle ranges, and within one rotation of the main shaft, each operation process of type selection - printing - paper feeding is performed sequentially, and in parallel with the paper feeding process. The main shaft is rotated and the necessary operations required for each stroke are performed through the rotation of the main shaft and the cam means provided integrally with the main shaft. fully achieve the purpose.

Embodiments of the present invention will be described in detail below with reference to one drawing.

"Example" The example shows an aspect of a serial printer applied to a check writer.

Figure 1 shows the external appearance of the check writer, which includes an input section 2 consisting of numerical keys for the amount to be printed, function keys such as an issue key and a memory key, and a display section 4 for displaying manually entered numerical values. The serial printer is disposed within a printing unit 6 provided on the negative side thereof.

To operate the blink in its initial state, first,
With the print paper F such as a check or receipt inserted into the print paper insertion path 8, print data such as the amount is input from the input section 2, this is confirmed on the display section 4, and the 1 issue key is pressed. Printing is performed on the paper, and during this time, the paper F is fed in the direction of the digit indicated by the arrow for each digit.

FIG. 2 shows the internal serial printer as seen from above with the cover of the printing unit 6 removed.
12 is a horizontal board that guides the printing paper, and 12 is the board lO.
A fixed frame 14 and 16, which together form the main body of the printer and are fixed vertically to the substrate in an upright position, are a pair of swinging frames arranged parallel to the fixed frame 12, sandwiching the fixed frame 12 therebetween.

These swing frames 14, 16 each have a support shaft 18 at one end.
are integrally fixed to each other, and are swingably supported at one end of the fixed frame 12 by the support shaft 18.

20 is a type shaft with printing type arranged around it, 22 is a ratchet wheel for selecting type that is provided integrally with the type wheel 20, and 24 is a type shaft 20 at a position near the free end of both swing frames 14 and 16. Rotates together with the type wheel 20. 26 is a detection disk Z fixed to one end of the spindle 24, and 28 is a photo sensor that cooperates with the disk 26 and constitutes an optical detection means that sends out timing pulses corresponding to each character position. It is attached to the moving frame 14.

Reference numeral 30 denotes a single drive motor for driving the serial printer, which is composed of a DC motor and is supported near the base end of the swing frame 14. The drive of the motor is transmitted to the type wheel 20 through an operation transmission means 32 consisting of a gear train, and the gear train consists of a small diameter gear 34 formed on the motor shaft and a first and second intermediate gear body 36, 38, main gear 40. and type wheel gear 42
and is arranged between both swing frames 14, 16.

The rotational speed ratio from the drive motor gear 34 to the main gear is:
The main gear 40 rotates once while the motor shaft rotates 45 times.4
The reduction ratio is set to 5:1, and the main gear 40 and the type wheel gear 4
2, during one rotation of the main gear 40, the type shaft gear 4
The speed increasing ratio is set so that 2 rotates 3 times.

The rain intermediate gear bodies 36, 38 are rotatably supported on the swing frame 14, 16 by support shafts 44, 46, respectively, and the main gear 40 is attached to a main shaft 48 that rotates together with the main gear 40,
The main shaft 48 is rotatably supported by both swing frames 14.16, and includes a main cam member 50 constituting the cam means.
and a drive cam member 52 for driving a half-pitch setting actuation bar 126, which will be described later, are integrally provided.

As will be described later, when the ratchet wheel 22 integral with the type wheel 2° is released from the locking lever 54, the engagement protrusion 8 is inserted into the engagement recess 22c of the wheel 22.
6b rotates together with the gear 42 in the fitted state.

Further, when the wheel 22 is stopped by the locking lever 54, the above-mentioned fitting is disengaged, and the elastic engagement body 86 that is integral with the gear 42 slips against the inner circumferential surface of the wheel 22, causing the gear 42 to move against the type wheel 20. relative rotation is allowed.

In this way, the mutual rotational speed ratios of the drive motor 30, the main shaft 48 (and the cam members 50, 52), and the type wheel 20 are also in the same relationship as above, and all of these are connected to the swing frame 1.
4.16.

In other words, since the entire drive system from the drive motor 30 to the type wheel 20 is provided on the swing frame 14.16, it is easy to design each member in the drive system, and no complicated connection mechanism is required. First, it is easy to achieve dimensional accuracy, and since the drive system can be pre-assembled into a unit together with the swing frame 14, 16 during assembly, assembly work and maintenance are also facilitated.

The unit structure further supports an operating bar 82 for paper feeding, a half-pitch feed control bar 84, etc., which will be described later, so that it is easy to assemble and adjust the paper feeding mechanism related to the drive system. be.

If the swing frame 14.16 is supported on the fixed frame 12 via the support shaft 18, the main cam member 50
In contrast, the cam follower 51 attached to the vicinity of the free end on the fixed frame 12 automatically responds to the rolling contact state.
There is no need for detailed adjustments with the fixed side.

Note that, depending on the design, the drive motor 30 may be installed on the main body side of the printer without damaging the drive transmission system.

54 has one end 54a selectively engaged with the type selection ratchet wheel 22, and the armature 54 at the other end.
b is a locking lever corresponding to the solenoid device 56, which is rotatably supported on the swing frame 14 by a pivot shaft 58, and biased by a spring 60 in one direction, that is, in the direction of detachment from the ratchet wheel 22. ing. A type selection mechanism is constructed here.

A solenoid device 56 is also provided on the swing frame 14, and this device 56 employs a so-called direct drive system in which the locking lever 54 is directly attracted when a type is selected.

Reference numeral 62 denotes an ink roller, which is detachably attached to the free end of the swing frame 14.16 by a roller holder 64 having a handle 64a against the plate spring 66, and in the illustrated attached state, it is attached to the type ring 20. They face each other so as to supply ink.

Reference numerals 68 and 70 indicate upper paper press rollers rotatably attached to each swing frame 14 and 16, and one roller 68 has a lower feed roller (not visible in the figure) attached to the main body. Correspondingly, the other roller 70 corresponds to a feed drive roller 74 (FIG. 7) attached to the main body.

The drive roller 74 is fixed to one end of a transmission shaft 76, and the other end of the shaft 76 extends to the base end of the fixed frame 12, and a paper feed ratchet wheel 78 is attached thereto, and a paper feed mechanism 80 is operatively connected to.

Note that 82 and 84 are a paper feed operation bar and a half pitch feed control bar that constitute a part of the paper feed mechanism 80;
Their operation will be described later.

As shown in FIG. 3, the drive morph 30 rotates in the direction of the arrow, and rotational driving force is transmitted from the gear 34 directly connected to the drive morph 30 to the type wheel 20.

The main cam member 50, which rotates together with the main shaft 48, cooperates with a cam follower 51 on the fixed frame 12 to swing the swinging frame 14, 16 and establish a printing mechanism that performs a printing operation, as will be described later. Configure.

In the illustrated initial state, the type ring 20 includes teeth 22a formed on the outer periphery of the ratchet wheel 22 corresponding to each character of the type ring 20, and includes reference teeth that protrude further in the radial direction than the tooth row. The locking lever 54 engages with 22b,
It is held at this position (reference position).

In this initial state, each type on the type wheel 20 is
As shown in the figure, a monetary unit mark (¥) is located at a position opposite to a stamp stand 88, which will be described later, and from there, commas (,), numbers (0 to 9) are sequentially displayed in the rotational direction of the type ring 20, which is indicated by an arrow.
, a notch 20a with no printed characters, an end mark (*) for preventing tampering, and further blanks or auxiliary numbers (in the embodiment, the number zero is provided) are arranged.

The type wheel gear 42 and the ratchet wheel 22 are gear 4
Through an elastic engagement body 86 integrally formed with 2, a frictional engagement relationship is established in which a frictional clutch can be slipped, forming a friction clutch. The engaging body 86 has an elastic piece 86c having a slit 86a and an engaging protrusion 86b formed at the end thereof.

The engaging protrusion 86b is configured such that when the type ring is in the reference position,
When rotating for character selection, the wheel 22 is fitted into a corresponding engagement recess 22c formed on the inner periphery of the wheel 22.

The type wheel 20 and gear 42 rotate together when selecting a type.

However, when the type is selected, the wheel 22 is moved to the locking lever 5.
4, the main gear 40 is stopped at the type selection position.
When the type ring gear 42 is rotationally driven, the protrusion 86b
is removed from the recess 22c, a slip occurs, and only the gear 42 rotates on the support shaft 24.

When the type wheel 20 is at the illustrated reference position, the outer circumferential position of the type wheel corresponding to the ink roller 62 is as described above.
A portion 20a is formed in the cutout where there is no printed character, and the ink roller 62 avoids the problem of certain printed characters constantly coming into contact with the ink roller.

The ink application by the ink roller 62 will be explained as follows.
At the start of type selection, while the type wheel 20 rotates in the direction of the arrow from the reference position in FIG. 3, ink is applied by sliding contact between the roller 62 and each type face. Therefore, if an end mark (*), etc., which is not printed at first, is placed between the mark (¥) and the notch part 20a, there is no risk that the first printing will be performed without applying ink. .

The above ink application is also performed at the time of reset when the type wheel 20 is returned to the reference position.

Note that the ink roller 62 is normally placed at a position completely separated from the type wheel, and is moved to a position close to the type wheel in conjunction with the swinging of the swing frame 14, 16 accompanying the printing operation. is also possible by design.If you do this like this,
Since it is not necessary to provide the cutout portion 20a in the type ring,
By that amount, you can increase the amount of type.

As shown, a fixed frame 12 and a swinging frame 16
has a U-shape as a whole, and the printing paper insertion path 8 divided by both frames is made to become as deep as possible toward the back. It can be printed in any position.

A printing stand 88 is positioned facing the type wheel 20 so as to be exposed through the window 90 of the base 10, and printing is performed here in front of the embossing. The marking stand 88 is pivoted by a support shaft 96 to a holding member 94 which is located on the lower surface side of the substrate IO and is swingably supported by a support shaft 92 to the fixed frame 12, and the free end of the holding member 94 is As shown in FIG. 4, it is configured to be screwed into an adjustment screw 98 attached to the fixed frame 12.

Therefore, by adjusting the screwing amount of the screw 98, the height position of the marking stand 88 can be adjusted. Also, stamp stand 88
Since it is configured to be rotatable around one support shaft 96, when it comes into contact with the corresponding type on the lowered type wheel during printing operation, it can be adjusted and rotated so as to fit perfectly along the surface of the type. Even if there are surface variations, uniform and clear printing is possible.

Note that the holding member 94 has a parallel lever shape that supports the marking stand 88 on both sides thereof.

Further, as will be described later, a printed wiring board 100 for detecting the rotational position of the main shaft 48 is fixed to the side surface of the main gear 40.

In FIG. 5, a control unit 102 that electrically controls each part of the printer includes a drive motor 30, a solenoid device 56, a photosensor 28 as an optical detection means, and a printed wiring board 100 on the side of the main gear. As shown in the timing chart of FIG. 15, control switches 104 that send out various control pulses at set timings are electrically connected to each other, and
2, mutual operations within the printer are controlled.

The input section 2 and display section 4 of the check writer are further electrically connected to the control section 102, and mutual operation control between these sections and the printer is performed.

When the locking lever 54 is not operated by the solenoid device 56, the locking lever 54 locks the bin 10 onto the swing frame 14.
6 and the elongated hole 108, and the spring 110
The position holding member 112 which is elastically held at the position shown in FIG.

On the other hand, when the suction operation is performed, it rotates against the spring 60 to the character selection position shown by the chain line. Furthermore, as clearly shown in FIG. 6, the locking lever 54 is provided with a 2-inch lever protruding from an annular recess 114 formed on the side surface of the main gear 40 at a predetermined angular imaginary position.
The end portion 54c can be engaged with the two engaging protrusions 116 and 118. One protrusion 116 is formed larger than the other protrusion 118, and immediately engages the end portion 54c at the beginning of the blink type selection operation, and the lever 54
is pushed up from its original position against the holding member 112 to disengage the lever 54 from the reference teeth 22b of the wheel 22, thereby selectively rotating the type wheel 20.

As will be described later, the other protrusion 118 has the effect of pushing up the locking lever 54, which has been attracted to the type selection position, to its original position using the residual magnetic force of the solenoid to release the lock from the type wheel 20.

As shown in FIG. 6, one rotation of the main shaft 48, the main gear 40, and the main cam member 50 that rotate integrally with the main shaft 48 is divided into three predetermined rotation angle ranges (120 degrees each in the embodiment). A first rotation angle range rotating in a clockwise direction is assigned to a type selection process, a second rotation angle range following it is assigned to a printing process, and a third rotation angle range following it is assigned to a paper feeding process. There is. In the above-mentioned paper feeding process, a reset operation process for returning the type wheel 20 to the reference position is also performed in parallel, and the ratchet wheel 22 is moved to the locking lever 54.
is stopped at the reference position by the type wheel gear 42.
rotates to a predetermined relative position with the type wheel 20 (FIG. 3), and here the engaging protrusion 86b is fitted in the engaging recess 22c, and the positional relationship between the type wheel 20 and the gear is in the initial state. Return to

In this manner, these operating strokes are performed continuously during one rotation of the main shaft 48 using the single drive morph 30 as a drive source.

The operation mode in each of the three divided strokes is shown in the timing chart of FIG. 15.

An explanation based on each item in the left column of the chart will be given later, but among the control pulses emitted from the control switch 104, the pulse to turn off the solenoid is emitted immediately after the printing operation is started, and this causes the solenoid to turn OFF. Although the excitation of the device 56 is cut off, from then on, during the printing operation, 1. The locking lever 54 is held at the selected position by utilizing the residual magnetism of the solenoid.

For this reason, the yoke, iron core, locking lever 54, etc. of the solenoid device 56 can be formed from a material that is susceptible to residual magnetism, for example, 5PCC'l'+5PHC, and therefore costs can be reduced. This has the advantage that it can be realized and the time required for energizing the solenoid can be saved.

The main cam member 50 has a cam follower 51 in the initial position.
A resting cam surface 50a that is in contact with the main cam member 50 and performs a detent function for positioning the main cam member 50, a pressing cam surface 50b that has the same radius R1 corresponding to the character selection process and the initial part of the printing process, and a pressing cam surface 50b that has the same radius R1 at the center of the printing process. A corresponding print cam surface 50c and a reset cam surface 50d having the same radius R2 are formed corresponding to the final stage of the printing stroke and the paper feeding stroke (reset stroke).

The print cam surface 50c also has a cam follower 12 for paper feeding placed at a 120 degree slower hum angle position than the cam follower 51 with respect to the cam member 50, as will be described later.
0 (FIG. 7), by which the paper feeding process is accomplished.

The radius R2 of the reset cam surface 50d is equal to the radius R2 of the reset cam surface 50d.
It is formed to be slightly smaller than the radius R1 of 0b.

In FIG. 7, on the swing frame 16 are a set lever 122, a trigger lever 124. The half-pitch setting actuation lever 126 and the paper feed actuation bar 82 are rotatably supported via support shafts 128, 130, 132, and 134, respectively.

The upper end of the set lever 122 is provided with a first stop bin 136 that selectively engages with a stop bin 136 protruding from the end of the fixed frame 12.
and second step portions 122a, 122b and first step portion 12
A vertical portion 122c is formed to partition one side of 2a.

In addition, a pair of left and right leaf springs 1 are attached to the sides of the lever 122.
40.142 is attached in the form of a cantilever beam with the base end portions being different at the top and bottom.

The upper end or free end of one leaf spring 140 is connected to the lever 12
The set lever 122 is suspended on a support shaft 132 of No. 6, and is given a clockwise rotation biasing force to the set lever 122. The other leaf spring 142 has a convex portion 142a at its free end or lower end, and is positioned to face the circumferential surface of a cam member 144 that rotates integrally with the type wheel 20. The cam member 14
A protruding portion 144a is provided at a predetermined position on the circumferential surface of 4.

The stop bin 136 is connected to the first step 122 as shown.
In the state engaged with a, the swinging frame 14.16
The lifting spring 1 is in the raised position shown in the figure, that is, in the open position so that the printing paper F can be freely inserted into the insertion path 8.
38, and indicates an unused state or an initial state of the printer.

In this raised position, the convex tip 14 of the root spring 142
2a is relative to the circumferential surface of the cam member 144.

It is located at a position with a gap approximately equal to the height of the convex portion 144a. That is, the convex portion 142a is in a state in which it is generally in contact with the rotation locus of the convex portion 144a, which is schematically indicated by the chain line.

In the type selection process, when the main cam member 50 rotates,
The swinging frame 14.16 is rotated by its pressing cam surface 50b.
Together with the set lever 122 and the upper paper pressing roller 70
is lowered, and the roller comes into contact with the feed drive roller 74 to sandwich the printing paper F, and the first character selection operation is performed here.

In this state, the plate spring 1 is attached to the set lever 122.
40, a clockwise rotational force is being applied to the stop pin 136, but the stop pin 136 is still rotated as shown by the solid line in FIG.
The vertical portion 12 does not fully protrude from the first step portion 122a.
2c, and maintains the position where it does not move to the second step 122b, that is, the state shown in FIG. 7.

Subsequently, when entering the printing process by the print cam surface 50C of the main cam member 50, the swing frame 14.16 further descends, and accordingly, the stop bin 136
As shown by the chain line in FIG.
rotates clockwise, and as shown in FIG.
moves to the second step portion 122b.

As a result, the convex portion 142a of the other leaf spring 142 comes into sliding contact with the peripheral surface of the corresponding cam member 144. Then, printing is performed in this state. In other words, in the case of this printer, \ is printed as the first character.

Upon completion of the printing operation, the swing frame 14.16 rises again, and the stop pin 136 moves to the second step 122b.
However, it becomes a state of frictional engagement.

Thereafter, the swinging frames 14, 16 are prevented from rising, and exhibit a so-called paper hold state.

Thereafter, due to the rotation of the main cam member 50, the reset cam surface 5
As described above, since 0d is formed to have a smaller diameter than the pressing cam surface 50b, the cam follower 51 is separated from the cam surface 50d with a slight gap, and therefore, due to the action of the pulling spring 13B, the stop pin 136 is the second
It is maintained in a strong engagement state with the stepped portion 122b of.

This state is continuously maintained during each printing cycle up to the printing of the final printed type, that is, the end mark (*) for tamper prevention.

In addition, in the reset operation of the type wheel 20 performed during the paper feeding process, the type wheel is released from the locking lever 54,
During the so-called reset rotation of the type wheel, the cam member 144 also rotates, and its convex portion 144a may engage with the convex portion 142a of the leaf spring 142 as shown in FIG. 10 as it passes. , the engagement force between the bin 136 and the second stepped portion 122b is large, and as shown in FIG. 10, only the leaf spring 142 is elastically deformed, and the position of the set lever 122 remains unchanged.

In this way, during a series of printing cycles, the set lever
122 maintains the rotating state shown in FIG.
Since the paper is fed in the paper feeding direction, problems such as poor paper feeding such as sheet misalignment and irregular printing do not occur.

Here, when the final printing operation cycle is reached and the end mark (*) is selectively printed, if the mark is placed at the printing position corresponding to the printing stand 88 in the character selection process, as shown in FIG. 11. As shown, the convex portion 1 of the cam member 144
44a is set at a position where it just engages with the protrusion 142a of the leaf spring 142. Therefore, a counterclockwise force acts on the set lever 122 via the leaf spring 142.

However, as described above, since the stop bin 136 is in frictional engagement with the second step portion 122b, the set lever 1
22 cannot be rotated during the character selection process, but when the swinging frame 14.16 further descends with the start of the printing operation, the engagement state is released, and the action of the leaf spring 142 becomes effective. The spring force overcomes the spring force of the other leaf spring 140 and rotates the set lever 122 counterclockwise to the position indicated by the chain line in FIG. 1, that is, the first stepped portion 122a.
The bin 136 is positioned above the.

Therefore, with the end of printing, the swinging frame 14, 16
When the bottle 136 returns upward, the bottle 136 moves to the first step 122a.
It is allowed to return to the raised position, and the printing paper F on which printing has been completed can be freely removed from the printer.

Note that the reset cam surface 50d of the main cam member 50 is important as a structure for reliably returning the swing frame 14.16 to the raised position.

That is, before the type wheel 20 starts reset rotation after printing is completed, that is, the convex portion 142a of the leaf spring 142 and the convex portion 14
4a, the cam surface 50d cooperates with the cam follower 51 to move the swing frame 14.16 until the bin 136 is moved from the dashed line position to the solid line position in FIG.
to rise.

Therefore, even if the stop bin 136 receives a clockwise force from the plate spring 140 due to the disengagement, the stop bin 136 has already entered the first step portion 122a and is blocked by the vertical portion 122C. There is no risk of returning to section 122b9111.

In this way, the operation timing of the reset cam surface 50d is set.

In the above description, the type selection process and printing process of the printer will be summarized below.

As described above, when print data such as a predetermined amount of money is input manually through the input unit 2 and the motor 30 is energized, the character selection process is started. The rotation of the motor 30 is transmitted to the main gear 40, main shaft 48, and main cam member 50 via the operation transmission means 32, causing them to rotate together. As a result, the locking lever 54 engages with the engagement protrusion 116, releases the reference tooth 22b, and rotates the type wheel 20 integrally with the type ring gear 42.

At the same time, a start pulse is issued via the control switch 104, a solenoid ON signal is issued via the control unit 102 at a position corresponding to the input character, and the locking lever 54 causes the corresponding selection tooth of the ratchet wheel 22 to be turned on. 22a to stop the type wheel 20.

From then on, the type ring gear 42 slips and rotates.

During this time, the pressing cam surface 50b of the main cam member 50 corresponds to the cam follower 51, and the swing frames 14, 16 are maintained in the paper holding state, and the printing paper F is held in a state where it does not shift.

The operation of the set lever 122 during this time is as described above.

Next, in the printing process, the print cam surface 50c of the main cam member 50 cooperates with the cam follower 51 to lower the swing frame 14.16, perform the printing operation at an angular position of 180 degrees, and then rise again. let Here, immediately after the swing frame 14, 16 starts printing operation from the paper holding state and further descends, the solenoid is turned on.
Although the FF control pulse is emitted, the locking lever 54 is held at the type selection position until the printing operation is completed due to the action of residual magnetism, and after the printing is completed, the locking lever 54 is held at the type selection position.
The reference tooth 2 is forcibly removed from the position due to engagement with the
2b.

During this time, the type wheel 20 is stopped by the locking lever 54, and the type wheel gear 42 continues slip rotation with the rotation of the main shaft 48, and after the locking lever 54 is released, the type wheel gear 42 is integrated with the type wheel 20. Rotate to.

The operation of the set lever 122 during the printing process is as described above.

Next, the paper feeding process and the reset operation performed in parallel thereto will be described below together with these configurations.

The trigger lever 124 rotates together with the type wheel 22 and is biased by a spring 127 toward a cam member 125 having an engagement recess 125a, so that the protrusion 124a engages with the circumferential surface of the cam member 125. As will be described later, the convex portion 124a corresponds to the concave portion 125a of the cam member 125 when a comma (,) is selected from among the typed characters.

The trigger lever 124 is in engagement with one end of the half-pitch control bar 84, and the bar 84 is placed on a support shaft 134 near one end and is in contact with the paper feed operating bar 82 at the other end. A bottle 146 and a long hole 14 are located nearby.
They are combined so that they can move relative to each other in a relationship of 8.

The operating bar 82 is held in the position shown by a spring 150, and during normal paper feeding, both bars 82.8
4 in this state, due to the engagement between the main cam member 50 and the cam follower 120, it rotates around the support shaft 134 against the return spring 152 at a timing 120 degrees later than the printing operation.

Both bars 82, 84 have, at their other ends 82a, 84a,
It is in engagement with the swing lever 154 of the paper feed mechanism 80.

The half-pinch setting actuation lever 126 is always engaged with the drive cam member 52 by the action of the spring 15B.

The drive timing of the actuation lever 126 by the drive cam member 52 is determined by the cam shape and lever shape so as to correspond to the printing stroke and paper feeding stroke (reset stroke) of the main cam member 50, as shown in the timing chart of FIG. is set.

In the paper feeding mechanism 80 shown in FIG.
54 is pivotally supported by the fixed frame 12 at its base end, has a feed claw 158 pivoted at the other end, and connects the feed claw 158 to the spring 16.
0, it is constantly engaged with the paper feeding ratchet wheel 78.

The wheel 78 is prevented from rotating blindly by a leaf spring 162 supported by the fixed frame 12.

Therefore, both bars 82, 84 are rotated and their ends 82a
, 84a reciprocate with a constant stroke as shown by the arrows in the figure, the feed pawl 158 moves the wheel 78 accordingly.
is rotated by 1 pitch (p), which corresponds to the feed of one digit, so this is the feed drive roller 74 via the transmission shaft 76.
The normal paper feeding of the printing paper F is performed.

Moreover, as can be seen from the timing chart in FIG. 15, this paper feeding operation is started after the printing operation is completed, with the type wheel 20 completely separated from the printing paper F, so that printing misalignment and type There is no dirt caused by rubbing against the ring.

Next, if the typeface to be printed is a comma (,) or the like (comma in the example), the pitch of the digit feed should be set smaller than the so-called regular feed amount (in order to improve the appearance of the print and prevent tampering). , for example, can be limited to half pitch (1/2p).

That is, as shown in FIG. 13, when a comma is selected in the type selection process and the corresponding type is set at a printing position corresponding to the printing stand 88, the recess 1 of the cam member 125
Since the lever 1.25a fits in the convex portion 124a of the trigger lever 124, the lever 1.24 rotates and connects one end of the half pitch feed control bar 84 to the operating lever 12.
Make it appear in the rotation trajectory of 6.

The lever 126 is driven by the cam member 52 at the start of the printing process, slides the half-pitch feed control bar 84 together, and as shown in FIG. to separate from In this state, the lower end edge 84b formed in a stepped manner on the bar 84 rides on the support shaft 134, and the cam member 52 holds the bar 84 in the sliding position within a predetermined angle range (240 degrees), so that printing is completed. Thereafter, in the paper feed process (reset process), the type wheel 20 is released from the locking lever 54 and rotated in a reset manner, and even when the trigger lever 124 returns to the state shown in FIG. 7, it is maintained at the slide position.

Therefore, when the paper feed operation bar 82 rotates in this state, the half pitch feed control bar 82 rotates as shown in FIG.
4, play (g) occurs during the drive stroke, and as a result, the amount of rotation of the swing lever 154 becomes smaller.
As a result, a limited feed amount (1/2 pitch in the example) is obtained.

In this way, a half-pitch paper feed operation can be performed at the same time during the reset process, making it possible to automatically control the paper feed amount using only a mechanical configuration without the need for electrical detection means. be.

Note that the feed limit amount can be set to a desired value depending on the relationship with the teeth of the ratchet wheel 78, and is not limited to 1/2 pitch.

In this way, in the paper feeding process, when feeding paper other than comma (1), the paper is fed at a predetermined regular pitch, and when printing a comma, the half pitch feeding control bar 8
Half-pitch paper feed is performed by slide 4.

Also, during the paper feeding process, the type wheel 20 rotates in a reset manner until the reference tooth 22b engages with the locking lever 54, and is stopped at the reference position again.

When the printing cycle is at the end mark (*), the drive motor 30 emits a control pulse to turn off the motor at an angle of 320 degrees, and the inertia of the motor causes the main cam member to stop at the stop cam. The cam follower 51 is set to rest at the surface 50a.

The rest cam surface 50a also serves as a detent for its positioning, thereby returning the main cam member 50 to its initial state. Then, the type ring gear 42 and the type ring 20 are all returned to their initial states with the engagement protrusion 86b refitted into the engagement recess 22c, and the next printing cycle begins.

Next, each item in the left column of the timing chart shown in FIG. 15 will be sequentially explained.

The chart shows the behavior of each member during one rotation of the main shaft 48 and main cam member 50 from their initial states.

First, the timing pulse is a pulse that is emitted in a type selection process corresponding to each type position detected by the cooperation of the detection disk 26 and the photo sensor 28, and selects a predetermined type and turns the solenoid ON to the solenoid device 56. Give timing. The control pulse is a pulse detected by the control switch 104 and emitted at a timing corresponding to the rotation angle of the main shaft.A start pulse is emitted at an angle of 0 degrees, and the position of the type is determined by counting the timing pulses after this pulse. At 150 degrees, a solenoid OFF pulse is issued, at 320 degrees,
The power supply to the drive motor 30 is stopped, which provides the timing for turning off the motor after the final type printing is completed. This stopping angle range of 40 degrees is set in consideration of the inertia of the motor to ensure that the motor stops in the initial state.

The swing amount of the swing frame indicates the swing amount when the swing frame 14.16 descends from the raised position.It descends to the paper holding state at the same time as the start of the printing cycle, and further descends during the printing process to stop the printing. After finishing, end mark (*)
For printing other than that, the paper is held in the held state as shown by the broken line, and when the end mark is reached, the paper returns to the raised position where the paper is released.

The paper feed operation indicates the amount of rotation of the paper feed operation bar 82 due to the engagement between the main cam member 50 and the cam follower 120, and as shown in Figure 1, the paper feed operation is performed at a ham position 120 degrees slower than the printing operation.

The locking separator indicates the rotational position of the locking lever 54 in cooperation with the solenoid device 56 and a pair of engaging protrusions 116 and 118 provided on the main gear 40. By this, the reference tooth 22b is overcome and released, and at the type position selected in the type selection process,
The type is rotated and held at the type selection position by a solenoid device, and 1
After the solenoid is turned off at the angular position of 50 degrees, it is similarly held in the selected position by residual magnetism until it engages with the other protrusion 11B, and the teeth of the ratchet wheel corresponding to the selected type are engaged with the protrusion 118. 22a is released and held at a position where it does not go over the reference teeth 22b, and in the paper feed process (reset process), the reference teeth 22b are locked and the type wheel 20 is stopped.

The half-pitch feed control bar slides the bar 84 relative to the paper feed operation bar 82 only when comma characters (,) are selected during the printing process and the paper feed process to control the half-pitch feed control bar. This shows a mode in which the paper is fed and the paper is not moved when other type characters are selected.

The set lever consists of a stop pin 136 and a set lever 1.
22 causes the lever 122 to move to the first step 12.
2a and the second stepped portion 122b. As mentioned above, the first printed character (¥), the intermediate printed character 1, for example, the number (4), and even the number (4) are shown. At the last end mark (*), the lever rotation status is different. As seen here, the lever 122 is held at the rotational position of the second stepped portion 122b from the start of printing of the first character (¥) until the end mark (*) is printed, so during this time, The paper holding state is maintained, and when printing an end mark, it is rotated to the first step position by the action of the leaf spring 142 immediately after the printing operation starts, and the timing of releasing the selected tooth by the locking lever 54 is adjusted. Before, the stop bin 136 is already in the first step 122a.
Since the swing frame 14.16 has fully entered the vertical portion 122c and is blocked by the vertical portion 122c, the swing frame 14.16 can be reliably returned to the raised position.

Finally, regarding the type wheel, the rotating state and stop state of the type wheel 20 are determined from the first type printed (\), the intermediate type,
For example, the number (4) is shown for the end mark (*).

Here, the type selection rotation rotates together with the type ring gear 42 until it is stopped by the rotation of the locking lever 54 when the solenoid is turned ON, and in the stopped state, the engagement protrusion 86b is disengaged from the engagement recess 22C. The gear 42 slips and rotates.

Then, the reset operation is started with the locking lever 54 releasing the selected tooth, and the type wheel 20 is moved by the elastic engagement body 86.
The elastic piece 86c is in pressure contact with the inner peripheral surface of the ratchet wheel 22 and rotates together with the type ring gear 42, and the reference tooth 22
When b is stopped at the reference position by the locking lever 54,
As only the type wheel gear 42 slips and rotates, the engagement protrusion 86b of the elastic engagement body 86 engages the engagement recess 2 of the wheel.
2c, the rotation is stopped, a predetermined relative position between the type wheel 20 and the type ring gear 42 (FIG. 3) is determined, and the initial state is returned.

Therefore, during the printing of one character, the type wheel 20 rotates once and the type wheel gear 42 rotates three times.

Although the embodiment in which the serial printer of the present invention is applied to a Chetaprinter has been described above, the printer is not limited to this, and can be widely applied to devices that require this type of printing.

[Effects of the Invention] As described above, according to the present invention, the main spindle is configured such that a series of operations such as type selection, printing and paper feeding, and type axis reset can be performed using a single drive motor as a power drive source. Since one rotation of the printer is divided into three parts and the operations are performed sequentially according to the stroke, the overall size of the printer can be reduced compared to the conventional configuration in which each operation is performed by a separate drive source. It is extremely easy to reduce the weight, and the drive motor can be a C motor, which is inexpensive and can output high torque, without using an expensive stepping motor.
It has many advantages such as easy cost reduction design.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is an external perspective view of a check writer equipped with a serial printer according to an embodiment of the present invention, FIG. 2 is a top view of a serial printer according to an embodiment of the present invention, and FIG. A longitudinal sectional view taken along line 3-3 in Figure 2, and Figure 4 is 4-4 in Figure 3! 5 is a front view N of FIG. 2, FIG. 6 is an enlarged explanatory view of main parts such as the main shaft, main cam member, main gear, etc., FIG. 7 is a rear view of FIG. 8 is a partially enlarged explanatory diagram of the set lever shown in FIG. 7, FIG. 9 is an exploded view of the operation of FIG. 7, and FIGS. 1O and 11 are partially enlarged explanatory diagrams of the set lever shown in FIG. 9. , Fig. 12 is a partial view of paper feed, Fig. 13
and Fig. 14 are partial operation explanatory diagrams of Fig. 7 and Fig. 15, respectively.
The figure is a timing chart of each operation of the serial printer. 12: Fixed frame 14.16: Swing frame 20: Type shaft 30: Drive motor 32: Operation transmission means 40: Main gear 48: Main shaft 50: Main cam member 54: Locking lever 56: Solenoid device 80; Paper feeding mechanism 82: Paper feed operation bar 84: Half pitch feed control bar 122-set lever

Claims (6)

[Claims] (1) A fixed frame, a swinging frame that is swingably supported with respect to the fixed frame and forms a printing paper insertion path between the fixed frame, a single drive motor, and a single type wheel rotatably supported; and the type ring is rotatably supported by the swinging frame at a spaced apart position, and one rotation corresponds to first, second, and third rotation angle ranges. A main shaft divided into three parts, an operation transmission means supported by a swing frame for operatively connecting the type wheel and the drive motor via the main shaft, and a cam means provided on the main shaft and rotating integrally with the main shaft. a type selection mechanism for performing a type selection operation of the type wheel in a first rotation angle range of the spindle; and a type selection mechanism cooperating with the cam means in a second rotation angle range following the first rotation angle range. a printing mechanism that swings the swing frame to perform a printing operation using the type wheel; and a printing mechanism that operates in cooperation with the cam means in a third rotation angle range following the second rotation angle range to rotate the printing paper insertion path. A serial printer comprising: a paper feeding mechanism that carries out a paper feeding operation along the digit direction of printing paper inserted therein. (2) The serial printer according to claim 1, wherein the drive motor is a DC motor and is mounted on the swing frame. (3) The serial printer according to claim 1, wherein the cam means comprises a single main cam member having an outer peripheral cam surface of a predetermined shape. (4) The serial printer according to claim 1, wherein the operation transmission means includes a gear train having a predetermined rotational speed ratio. (5) The serial printer according to claim 4, wherein the rotational speed ratio is set to 1:3 between the main shaft and the type wheel so that the type wheel rotates three times for one rotation of the main shaft. . (6) The type selection mechanism includes an optical detection means that has a detection disk that rotates together with the type wheel and detects the position of each type on the type wheel, and a type selection mechanism that is selected in response to a detection signal from the detection means. 2. A serial printer according to claim 1, further comprising solenoid means for stopping printed characters at a printing position.