JPH0246392B2 - SHIRIARUPURINTA - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to serial printers, and particularly to improvements in their printing and paper feeding mechanisms.

In a serial printer, the print head moves back and forth in the line direction of the print paper, and during this movement, desired characters are printed one after another on the print paper, and printing is completed on a predetermined line of the print paper. The paper is fed every time.

There are various types of printing heads, such as wire dot, cylinder face, and ball face, but the type in which the cylinder face, that is, the type ring is used as the printing head, has a relatively simple head configuration and allows for a low-cost printer. This type wheel has type characters arranged in a row around the outer periphery of the disk, and is rotationally driven by a motor, and its printing and paper feeding operations are performed as follows.

That is, as a printing mechanism in a conventional device, there is a drive motor that rotationally drives a type wheel, a print drive wheel that has print claws continuously protruding from its outer peripheral surface and is rotationally driven by the drive motor, and a print drive wheel that rotates by the drive motor. A printing operating lever is provided that enters the protruding area of the printing claw and is driven to engage with the printing claw to press the type wheel and printing paper, and when a printing command is issued, the printing operating lever is activated to perform printing. The printing wheel enters the protruding area of the printing pawl on the drive wheel, and as a result, the printing operating lever is driven to engage with the printing pawl, and printing on the printing paper is achieved by pressing the type wheel and the printing paper.

Further, the paper feeding operation in the conventional device is performed as follows. That is, the conventional device includes a paper feed drive wheel having a protruding paper feed claw formed on the outer peripheral surface and rotationally driven by the drive motor, and a paper feed drive wheel that enters the protruding area of the paper feed claw based on a paper feed command to feed the paper. A paper feed lever that is engaged with the pawl and driven to feed the printed paper is provided, and when printing of a predetermined line on the print paper is completed, a paper feed command is issued, and the paper feed lever starts feeding the paper. The paper feed lever enters into the protruding area of the paper feed pawl on the drive wheel, and as a result, the paper feed lever is driven to engage with the paper feed pawl, and the driving force of the paper feed lever acts as a rotational force of the paper feed roll to accomplish paper feeding. Ru.

In this type of conventional device, the printing operation and the paper feeding operation are performed separately and independently, so there is an inconvenience such as printing being performed while the paper is being fed.In order to avoid this inconvenience, conventional improved devices have been developed. For example, countermeasures such as interposing a clutch between the type wheel and the motor to stop the type wheel at a predetermined position when paper is being fed, or in other words, selecting the position of the type wheel facing the printing paper on the surface without characters and stopping the rotation, are taken. It was being taught.

However, even with this improved conventional device, there were drawbacks such as large energy loss because the type wheel was stopped during paper feeding, and the device becoming complicated.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide an improved serial printer that has a simple structure, reduces energy loss, and can reliably perform printing and paper feeding. It's about doing.

In order to achieve the above object, the present invention includes a drive motor that rotationally drives a type wheel, a print drive wheel that has print claws continuously protruding from its outer peripheral surface and is rotationally driven by the drive motor, and a print drive wheel that is rotationally driven by the drive motor. a printing operating lever that enters into the protruding area of the printing pawl and is driven to engage with the printing pawl to press the type wheel and the printing paper; a rotationally driven paper feed drive wheel;
A serial printer including a paper feed lever that enters a protruding area of the paper feed claw based on a paper feed command, is driven to engage with the paper feed claw, and feeds printed paper, in response to the print command or the paper feed command. an electromagnetic means for driving the printing operation lever and the paper feed lever at the same time based on the print drive wheel; a print claw cutout is provided on the outer periphery of the print drive wheel; and the paper feed drive wheel and the print drive wheel are adjacent to each other. When the paper feed claw comes to the approach position of the paper feed lever by being arranged and rotated synchronously, the printing claw missing portion is arranged opposite to the approach position of the printing operation lever. .

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment of a serial printer according to the present invention, in which a type wheel 10 in which type is arranged in a row around the outer periphery of a disk is connected to a type wheel drive shaft 1.
2 so as to be slidable in the axial direction and rotatable integrally with the type wheel drive shaft 12. The type wheel 10
is connected to a slide arm 14, and as the slide arm 14 reciprocates in the axial direction of the type wheel drive shaft 12, the type wheel reciprocates.

A type wheel drive gear 18 is fixed to one end of the type wheel drive shaft 12.
is rotationally driven by a drive motor 28 through a gear train consisting of connecting gears 20, 22, 24 and a motor gear 26. Result of above type wheel 10
is rotated for character selection and reciprocated for setting at a predetermined printing position.

A signal plate 30 for detecting the position of the type on the type wheel 10 is fitted to the other end of the type wheel drive shaft 12, and a type position signal detected by the signal plate 30 is sent to a control device (not shown). The desired type is selected by comparing it with the print signal sent to the printer.

The drive motor 28 rotates the type wheel 10 described above and also serves as a print drive wheel 3 that provides printing driving force.
2, and a paper feed drive wheel 3 that provides paper feed driving force.
4 to rotate. That is, a driving force transmission gear 36 is fitted to the drive shaft 35 of the connecting gear 24 that meshes with the motor gear 26, while the printing drive wheel 32 and the paper feed drive wheel 34 are connected to, for example, injection The rotating shaft 37 is integrally formed by molding, etc., and a gear 38 is fitted onto the rotating shaft 37. By meshing the gear 38 and the driving force transmission gear, both the driving wheels 32 and 34 are driven by the driving motor 28. It is driven to rotate.

The printing driving force of the printing driving wheel 32 is transferred to the printing wheel 10.
A print actuation lever 46 is disposed opposite the print drive wheel 32 for transmitting the signal to the hammer 44 located opposite the print drive wheel 32. The printing operating lever 46 is pivotally connected to an arm 48 extending from the hammer 44 by a pin 50, and the printing operating lever 46 and the arm 4
8 is connected by a spring 51, and an engagement pawl 52 of the print operating lever 46 is maintained in a retracted state relative to a print pawl 40 that is normally formed protruding from the outer periphery of the print drive wheel. A driving force transmitting pawl 54 is formed projecting from the lower end of the printing operation lever 46, and this driving force transmitting pawl 54 is formed so as to be engageable with an engaging pin 56 provided on the arm 48 described above.

An electromagnetic means 57 is used to drive the print operation lever 46 based on a print command to start a print operation.
will be provided. In this embodiment, the electromagnetic means 57 is comprised of an armature 58 that engages with the print operating lever 46, an electromagnet 60 that attracts the armature 58, and a return spring 62 that applies a return force to the armature 58.

The armature 58 is the previously described printing operation lever 46.
An electromagnet 60 is arranged in front of the electromagnet 60, and when an excitation signal (print signal) is supplied to the electromagnet 60, the armature 58 is attracted to the electromagnet 60, and the printing operation lever 46
As a result, the engaging claw 52 presses the printing claw 40 forward.
It is configured to enter the protruding area of the When the excitation signal is interrupted, the attraction action of the electromagnet 60 is released and the armature 58 is returned to its original position by the restoring force from the return spring 62.

Therefore, when the engaging claw 52 enters the protruding area of the printing claw 40, the engaging claw 52 engages with the printing claw 40 and receives rotational force from the printing claw 40, so that the printing drive wheel 32 rotates about the pin 50 as the rotation axis. Rotate in the opposite direction. Then, the driving force transmission claw 54 is connected to the engagement pin 5.
6, the driving force from the printing drive wheel 32 is transmitted to the hammer 44, and printing is performed on printing paper. That is, near the upper end of the hammer 44, there is a short rotation shaft 64a,
64b is provided protrudingly, and these rotating short shafts 64a, 64b
is pivotally attached to a side plate of the main body (not shown), and therefore the engagement pin 56 is connected from the driving force transmission claw 54.
When the driving force is transmitted to the hammer 44, the hammer 44 rotates about the short rotational shafts 64a and 64b in the direction of pressing the type wheel 10, and the printing paper pulled out between the hammer 44 and the type wheel 10 is rotated. 66 is pressed against the type ring to perform printing.

When the excitation signal to the electromagnet 60 is cut off, the armature 58 is returned to its original position, and at the same time, the print operating lever 46 and the hammer 44 are returned to their original positions by their respective return springs (the return spring for the hammer is not shown). It is prepared for the printing operation.

A paper feed lever 68 is provided opposite the paper feed drive wheel 34 in order to transmit the driving force of the paper feed drive wheel 34 to a paper feed roll, which will be described later. The details of this paper feeding mechanism are shown in FIG.
8 has a paper feed engagement claw 70 protruding from the front of the upper end and a paper feed transmission claw 72 from the front of the lower end. The paper feed engagement pawl 70 is urged rearward by the paper feed driving wheel 34 and is retracted from the protruding area of the paper feed pawl 77 on the paper feed drive wheel 34.

A conversion lever 78 is disposed below the paper feed lever 68 to convert the lever driving force of the paper feed lever 68 into rotational driving force. The conversion lever 78 is rotatably arranged around a rotation shaft 80, and a paper feed engagement pin 82 that engages with the paper feed transmission claw 72 is located at a position rearward of the rotation shaft 80. It is provided. A gear 84 is provided at the tip of the conversion lever 78.

The paper feed driving force from the gear 84 is transmitted to a one-way clutch 86. The one-way clutch 86 is formed of a clutch gear 88 that meshes with the gear 84, and a paper feed transmission gear 90 coaxially arranged in parallel with the clutch gear 88. That is, in FIG. 2, the driving force is transmitted to the transmission gear 90 only when rotating in the direction A, and when rotating in the opposite direction, the driving force is not transmitted to the transmission gear 90 and the transmission gear 90 idles.

A paper feed gear 92 is disposed in mesh with the transmission gear 90. A paper feed roll 94 is coaxially connected and fixed to the paper feed gear 92.
The printing paper 66 is fed by being rotationally driven by the transmission gear 90 .

The paper feeding mechanism in this embodiment has the above-mentioned configuration, and includes the electromagnetic means 57 used for the printing operation described above.
is used for paper feeding operation, and paper feeding is performed as follows based on a paper feeding command.

When a paper feed signal is issued, the electromagnet 60 is excited and attracts the armature 58. Subsequently, the armature 58 engages the paper feed lever 68, and the paper feed engagement pawl 70 engages the paper feed pawl 7 of the paper feed drive wheel 34.
7, the rotational force is transmitted from the paper feed claw 77, and the paper feed lever 68 rotates in the direction B in FIG. As a result, the paper feed transmission claw engages with the paper feed engagement pin 82 and rotates the gear 84 in the C direction. Therefore, the clutch gear 88 meshing with the gear 84 is rotated in the direction A, and the transmission gear 90 and the paper feed gear 92 are rotated.
The paper feed roll is then rotated in the paper feed direction to achieve paper feed per line.

In this embodiment, the printing actuation lever 46 and the paper feed lever 68 are both engaged and actuated by the same armature 58. That is, when either a print signal or a paper feed signal is input to the electromagnet 60, a suction action is performed on the armature 58, and the armature 58 engages with both the levers 46 and 68, so that both levers 46 and 68 are moved simultaneously. The printing pawl 40 and the paper feeding pawl 77 are driven into their respective protruding areas.

The characteristic feature of this embodiment is that the armature 5
The print drive wheel 32 and the paper feed drive wheel 34 have a unique configuration so that even if both levers 46 and 68 are driven simultaneously by the levers 8 and 8, printing is not performed simultaneously during paper feed movement, but is always performed separately. This is what happened. That is, the printing drive wheel 3 in the first embodiment
In No. 2, a printing pawl 40 is formed protrudingly on the outer peripheral surface of the cylinder, but this printing pawl 40 is not formed on the entire circumference of the cylinder's outer peripheral surface, but has a characteristic printing in which the printing pawl 40 is not formed in a part of the cylinder. A pawl cutout 41 is provided, and the paper feed drive wheel 34 is provided with the print drive wheel 3.
A paper feed pawl 77 is formed protrudingly at a position corresponding to the printing pawl missing portion 41 of No. 2, and both drive wheels 32,
Reference numeral 34 indicates that the paper feeding claws 77 are integrally formed and are arranged in parallel at positions corresponding to the printing claw missing portions 41.

Since the print pawl 40 and the paper feed pawl 77 are configured so that they are not parallel to each other, even if the print actuation lever 46 and the paper feed lever 68 are simultaneously engaged and actuated by the armature 58, both levers 40
6 and 68 are not driven by the print pawl 40 or the paper feed pawl 77 at the same time, thereby reliably avoiding the problem of printing being performed simultaneously during paper feed movement.

FIG. 3 shows a second embodiment of the serial printer according to the present invention, and the same members as those in the first embodiment described above are given the same reference numerals and their explanations will be omitted.

The characteristic feature of the second embodiment is that the print drive wheel 32 and the paper feed drive wheel 34 are formed separately, and the print pawl missing portion 41 in the print drive wheel 32 and the paper feed in the paper feed drive wheel 34 are formed separately. Both drive wheels 3 are moved so that the claws 77 are parallel to each other at the entry position of the print operating lever 46 and the paper feed lever 68.
2 and 34 are rotated synchronously.

In FIG. 3, a gear 96 is coaxially fixed to the print drive wheel 32, and a gear 98 is formed on the outer side surface of the paper feed drive wheel 34.

The printing drive wheel 32 and the paper feed drive wheel 34 are arranged adjacent to each other, and as in the first embodiment, the print operating lever 46 is opposed to the print drive wheel, and the print operation lever 46 is opposed to the paper feed drive wheel to feed the paper. The adjacent distance between the drive wheels 32, 34 is selected such that levers 68 are arranged, respectively, and the levers 46, 68 are engaged and actuated by the same armature 58. As shown in FIG.
The gears 100 and 102 are respectively meshed with each other. The gears 100, 102 are rotationally driven by a drive motor 28, and as a result both drive wheels 32, 34 are rotated.

The gear 96, the gear 98, the gears 100, 102
The number of teeth is appropriately selected so that the print drive wheel 32 and the paper feed drive wheel 34 are rotated synchronously. In the embodiment, the number of teeth is selected so that the paper feed drive wheel 34 rotates twice when the print drive wheel 32 rotates once, and when the paper feed claw 77 is rotated to the entry position of the paper feed lever 68. The print pawl cutout portion 41 of the print drive wheel 32 is parallel to the paper feed pawl 77 and rotated synchronously so that it is always rotated to the entry position of the print operating lever 46. That is, the printing drive wheel 32
Two printing pawl cutouts 41a and 41b are arranged at symmetrical positions on the outer periphery of the paper feed pawl 7, for example.
7 and the printing claw missing portion 41a are connected to the levers 46, 6.
8, when the paper feed claw 77 rotates once and reaches the lever 68 approach position, the printing drive wheel 32 rotates half a time, and the printing claw missing portion 41b and the paper feed claw The levers 46 and 68 are synchronously parallel to each other in the entry position with respect to the lever 77, thereby making it possible to avoid printing during paper feeding.

As explained above, according to the present invention, when the paper feed claw 77 is rotated to the entry position of the paper feed lever 68, the print claw missing portion 41 is parallel to the paper feed claw 77, and the print operating lever 46 is moved in parallel. Since the levers 46 and 68 are rotated at the same position, printing will not be performed during paper feeding movement even if both the levers 46 and 68 are driven in at the same time by electromagnetic means, making it possible to provide a highly reliable serial printer. It is.

Furthermore, as described above, since the printing operation lever 46 and the paper feed lever 68 are configured to be simultaneously driven inward by electromagnetic means, the structure is simpler and the manufacturing process is simpler than in the case where the levers 46 and 68 are driven inward separately. It is possible to reduce costs.

In both the first and second embodiments, a case is shown in which one type wheel is used, but it is also possible to use a plurality of type wheels and perform a printing operation selectively as appropriate.

Furthermore, although the printing mechanism in both the first and second embodiments is shown as having a configuration in which a hammer presses the printing paper against the type ring, it is also possible to use a configuration in which the type ring is pressed against the printing paper.

Furthermore, the paper feeding mechanism is not directly performed by mechanical means as in this embodiment, but by electrically detecting the movement of the paper feeding lever, and triggering the detection signal to feed the paper using an intermittent gear or other means. It is also possible to do so.

[Brief explanation of drawings]

FIG. 1 shows a first example of a serial printer according to the present invention.
FIG. 2 is a perspective view showing a main part of a paper feeding mechanism of a serial printer according to the present invention, and FIG. 3 is a perspective view showing a second embodiment of a serial printer according to the present invention. 10... Type wheel, 28... Drive motor, 32...
...Print drive car, 34...Paper feed drive car, 40...
Printing claw, 41... Printing claw missing part, 46... Printing operation lever, 57... Electromagnetic means, 66... Printing paper,
68...Paper feed lever, 77...Paper feed claw.

Claims (1)

[Scope of Claims] 1. A drive motor that rotationally drives a type wheel, a print drive wheel having printing pawls continuously protruding from its outer peripheral surface and rotationally driven by the drive motor, and a print drive wheel that rotationally drives a type wheel based on a print command. a printing operation lever that enters the protruding area of the printing pawl and is driven to engage with the printing pawl to press the type wheel and the printing paper; and a paper feed pawl is formed protruding from the outer peripheral surface and is rotationally driven by the drive motor. A serial printer comprising: a paper feed drive wheel; and a paper feed lever that enters a protruding area of the paper feed pawl based on a paper feed command and is driven to engage with the paper feed pawl to feed printed paper, comprising electromagnetic means for simultaneously driving the print operating lever and the paper feed lever based on the print command or the paper feed command;
A print pawl cutout is provided on the outer periphery of the print drive wheel, and the paper feed drive wheel and print drive wheel are arranged adjacent to each other and rotated synchronously, so that the paper feed pawl is moved to the entry position of the paper feed lever. 2. A serial printer characterized in that, when the print operation lever reaches the entry position, the printing pawl cutout portion is disposed opposite to the entry position of the printing operation lever. 2. The serial printer according to claim 1, characterized in that the paper feed drive wheel and the print drive wheel are integrally arranged adjacent to each other, and the paper feed claws are arranged parallel to each other in correspondence with the print claw missing portions. serial printer.