JPH031256Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a printer device, in particular, a hammer biased by a hammer spring applies a striking impact to a type drum, and the striking impact of the hammer is applied to a hammer lock lever and an electromagnetic means armature. The present invention relates to an improved printer device of the type that controls the printer.

[Prior Art] Various printers are well known as output devices for various information devices, but there is a type of flying printer in which a hammer is driven to strike a type drum at a desired printing timing toward a type drum on which a plurality of types are formed on the outer periphery. It is suitable as a small printer, and can print clearly using an ink ribbon or an ink roll.

Normally, the hammer is placed on the type drum by the biasing force of the hammer spring, and when the hammer is released from the type drum with the hammer spring biased, it is moved to the printing standby position by the hammer lock lever. The locking state of the hammer lock lever is controlled by an electromagnetic means, that is, an armature of the electromagnetic means engages with the hammer lock lever, and when a print command is applied to the electromagnetic means, the armature engages the hammer lock lever. Rotate the lock lever a predetermined amount to release the lock from the hammer.

In recent years, there has been a demand for higher processing speeds for this type of printer, and it is necessary to shorten the response time from the application of an electrical printing command to the striking impact of the hammer. It is necessary to quickly rotate the hammer using the armature. In addition, due to the recent demand for smaller printers, there is a desire to reduce the drive current of the device.In particular, such power saving is strongly desired for battery-powered printers, and it is necessary to reduce the current consumption of electromagnetic means. However, it is necessary to drive the hammer in a reliable manner, and for this purpose, it is necessary to efficiently transmit the force between the armature and the hammer lock lever.

[Purpose of the invention] The present invention was devised in view of the above-mentioned conventional problems, and its purpose is to provide an improved printer device that can extremely efficiently control the rotation of a hammerlock lever using electromagnetic means. Our goal is to provide the following.

[Structure of the invention] In order to achieve the above object, the invention provides a hammerlock lever with at least two different contact parts that contact the armature, and both contact parts are connected to the armature and the lever of the hammerlock lever, respectively. This is provided at a position where the ratio is changed, thereby efficiently transmitting the initially weak attraction force of the armature due to electromagnet energization through a small lever ratio, increasing the initial speed of the armature and hammerlock lever, and increasing the initial speed of the armature and hammerlock lever. The feature is that after the suction force becomes high, the lever ratio is increased to increase the rotation speed on the hammerlock lever side, and by this,
This makes it possible to rotate the hammerlock lever extremely smoothly and quickly.

[Embodiments] Preferred embodiments of the present invention will be described below based on the drawings.

1 and 2 show a schematic perspective view of the printer device according to the present invention and details of the hammer lock mechanism,
In the printer shown in the figure, one electromagnetic means is provided for every three digits of the hammer in order to release the hammer from the printing standby state based on a print command, and the printer is of the so-called three-digit one electromagnetic means type.

Additionally, the printer according to this embodiment stops the printing operation every time one printing cycle or one line printing cycle ends, performs auxiliary operations such as paper feeding during that time, and restarts to print the next cycle. Consists of an intermittent start-up printer that performs

The type drum 10 is continuously rotated by a drive motor 14 via a reduction gear train 12 during a printing operation, and a plurality of type characters formed on its outer periphery pass through a printing position in a predetermined order. A plurality of digits of hammers 16 are arranged in alignment facing the printing position of the type drum 10, and a recording paper 18 is inserted between the type drum 10 and the hammers 16. Each hammer 16 is always biased toward the type drum 10 by a hammer spring 20, and when a desired selected hammer 16 is struck toward the type drum 10 by the biasing force of the hammer spring 20, , the printed characters at the printing position at that time are printed on the recording paper 18.

In order to detect the position of each type on the type drum 10, a character pulse generating roller 22 is fixed to the main shaft 14a of the drive motor 14, and a character pulse generating roller 22 is fixed to the main shaft 14a of the drive motor 14. Character pulses indicating the position of the printed characters are electromagnetically detected from the head 24.

The embodiment shows an ink roller type printer, and ink is supplied from an ink roller 26 that rotates in contact with the type drum 10 to adhere to each type.
This is transferred onto the recording paper 18.

A reset cam 28 is provided to move the hammer 16 away from the type drum 10 against the hammer spring 20 and into a printing standby position. The shaft 30 forms a part of the reduction gear train 12.

In the embodiment, since the type arrangement of the type drum 10 is such that three-digit hammers 16 are controlled by one electromagnetic means, each type is arranged in a 1/3-digit width in the line direction within a type set for every three digits.
The reset cam 28 is also composed of a set of three digits, and as is clear from FIG. 2, the arrangement is shifted by a 1/3 pitch.
In addition, since the reset cam 28 of the embodiment has a cam shape in which one circumference is divided into two, the reset cam shaft 30
is set so that 1/2 revolution corresponds to one pitch of the type drum 10.

The reset cam 28 has a reset cam portion on its outer periphery, and when the reset cam comes into contact with the hammer, the hammer 16 is connected to the hammer spring 2.
In the embodiment, the reset cam 28 is provided with two reset portions 28a along its circumferential direction to prevent the reset cam 28 from falling during printing. The reset cam shoulder portion 16a of the hammer 16 that has fallen into the recessed portion 28b is moved to one of the reset cam portions 28.
It can be reset by pushing it up to the printing standby position using a.

In this embodiment, the hammer 16 can take a retracted position other than the above-described printing standby position, and in this retracted position, the hammer lock spring 20 moves to a position where the hammer 16 does not come into contact with the reset cam 28.
Since the hammer 16 and the reset cam 28 are rotated against the rotational force, it is possible to completely eliminate the collision and contact between the hammer 16 and the reset cam 28, which could not be avoided in the past, and to obtain a printer that has less wear and noise and can reduce power consumption. In this embodiment, the retracting action of the hammer 16 is performed every printing cycle.

In order to perform the above-mentioned retraction action, in this embodiment, a retraction cam 32 is provided near the hammer 16, and in the embodiment, all the hammers 16 are simultaneously rotated to the retraction position by the retraction cam 32. . A clear lever 3 is attached to the evacuation cam shaft 34 of the evacuation cam 32.
6 is fixed, and a roller 38 pivotally supported at one end of the clear lever 36 is urged by a spring 42 toward a clear cam 40 coaxially fixed to the type drum 10. Therefore, type driver 10
Clear cam 40 every one rotation, or one printing cycle.
The retracting cam 32 is rotated via the roller 38 and the clear lever 36, and the retracting action described above is performed every printing cycle at the end of printing. Until the retracting action is performed, the clear lever 36 is held in a position where it abuts against the stopper 44 by the spring 42.

In the case of the intermittent startup printer shown in this example,
It is desired to stop the type drum 10 quickly at the end of one printing cycle, and for this purpose, in the embodiment, a brake mechanism using the swinging of the clear lever 36 is employed. That is, the reset cam shaft 3 forming the drive wheel train of the type drum 10
A brake drum 46 is fixed to the clear lever 36, and a brake shoe 48 is fixed to the clear lever 36, and the friction between the two applies a rapid braking force to the reset camshaft 30, causing the type drum 10 to be stopped suddenly. I can do it. In order to sufficiently increase the braking force of the brake shoe 48, the brake shoe 48 is assembled into the clear lever 36 with initial torque applied in advance, and the brake shoe 48 is attached to the stop bar 50 when not braking. The brake drum 46 is brought into contact with the brake drum 46 to prevent it from coming into contact with the brake drum 46.

A further feature of this embodiment is that the print reference signal can be taken out using the swinging action of the clear lever 36 mentioned above. Normally, the printing reference signal is generally a reset signal after the end of one printing cycle, and paper feeding and other auxiliary operations are controlled based on this reset signal, and the printer prepares for printing the next line.

In the embodiment, the printing reference signal generator consists of two pieces 5 having one end fixed with an insulating substrate 52 in between.
4 and 56, and both sections 54 and 56 are biased in the direction of coming into close contact with each other. Then, a switch operator 58 made of a wire spring held by the clear lever 36 mentioned above engages with one section 54, and both sections 54, 54,
56 contact states are controlled.

As is clear from FIG. 3, the switch operator 5
8 is held on the clear lever 36 by a stop pin 60, and its position is regulated by stopper pins 62 and 64. And both the sections 54,
56 are also positionally regulated by stopper pins 66 and 68, respectively.

Figure 3 shows the normal state, with the clear lever 36
The hammer lock lever is rotated clockwise by the spring 42 to the position where it contacts the stopper (Fig. 1), and as a result, the switch operator 58
Since the section 54 is pushed up until it comes into contact with the stopper pin 66, and the other section 56 is regulated by the stopper pin 68, both sections 54 and 56 are in an open state.

On the other hand, when one print cycle is completed, the clear lever 36 is rotated clockwise by the clear cam 40, as described above. Therefore, as shown in FIG.
When the two segments 54 and 56 come into contact with each other, a reset pulse can be output.

As described above, according to this embodiment, the print reference signal can be extracted using the essential mechanical swinging motion of the clear lever.

As mentioned above, in this embodiment, it is necessary to maintain the printing standby position and the retracted position of the hammer 16, but in this embodiment, the hammer 16 is not directly engaged with the armature of the electromagnetic means. Both positions are held by a lock lever.

The hammer lock lever 70 of the embodiment has each hammer 1.
6 are provided for each digit, and are aligned and supported by a shaft 72.

And the hammer lock lever 70 is the hammer 16
A lock arm 70a that engages and disengages from the lock end 16b of the
and a release arm 70b which extends bifurcated relative to the lock arm 70a and engages with an armature of an electromagnetic means to be described later. Each hammer lock lever 70 is provided corresponding to the hammer 16, and can independently hold or release the hammer 16 separately from other levers. In this embodiment, the plurality of hammer lock levers 70
As a group, three hammerlock levers 70 are commonly controlled by electromagnetic means in the figure, but after the printing command to the solenoid is released, each hammerlock lever 70 is controlled separately. In cooperation with the hammer 16, it is possible to eliminate friction loss and noise generation for each digit.

In this embodiment, in order to maintain both the printing standby position and the retracted position of the hammer 16, the hammer 16 is
Hammer 1 is installed between 6 and hammer lock lever 70.
6 in the printing standby position and a second holding part that holds the hammer 16 in the retracted position. In the illustrated embodiment, the first holding part is the holding arm of the hammer 16. formed from a first holding stage 74 provided at 16b;
The holding portion is formed by a second holding stage 76 provided on the holding arm 16b. The first holding stage 74 holds the hammer 16 shallowly in the printing standby position (FIG. 5), while the second holding stage 76 holds the hammer 16 in a shallow position (FIG. 5).
In the present invention, by holding the hammer 16 in the deeply retracted position (FIG. 2), it is possible to completely eliminate contact between the hammer 16 and the reset cam 28, as shown in FIG. becomes.

An electromagnetic means 78 is provided to release the lock of the hammer 16 by the hammer lock lever 70 described above based on the application of a printing command.
8 corresponds to every three hammer lock levers 70, contributing to miniaturization of the device. The electromagnetic means 78 is a solenoid 80 which is energized by a printing command.
It also includes an armature 82 that is attracted by the solenoid 80 and an armature spring 84 that separates the armature 82 from the solenoid 80.

Therefore, when a printing command is applied from the hammerlocked state as shown in FIG. 2, the armature 82 is attracted by the solenoid 80 and engages with the release arm 70b to rotate the hammerlock lever 70 clockwise.

As a result, the lock arm 70a separates from the lock end 16b of the hammer 16, and the desired printing effect is achieved.

In the embodiment, the electromagnetic means 78 shown in FIG.
A predetermined play gap P is provided between the armature 82 and the release arm 70b of the hammerlock lever 70 when the electromagnetic means 78 is not energized, and during the prestroke in which the armature 82 moves through the play gap P when the electromagnetic means 78 is energized. Armature 82 is provided with the initial velocity necessary to disengage hammerlock lever 70.

The characteristic feature of the present invention is that the hammerlock lever 70 is provided with at least two contact parts that contact the armature 82, and at the beginning of the movement of the armature 82, one of the contact parts
Further, after the armature 82 and the hammerlock lever 70 are engaged and moved by a predetermined amount, the second abutment portion functions as a point of action that determines the lever ratio of each.

That is, as is clear from FIG. 2, in this embodiment, the release arm 70a of the hammer lock lever 70 has a first abutting portion 100a located above the figure.
It is understood that second abutting portions 100b are also provided below the second abutting portions 100b, and abutting the armature 82 at different positions.

As mentioned above, in this embodiment, the armature 82 is given a suitable initial velocity during its pre-stroke by the excitation of the electromagnetic means 78, but the initial contact between the armature 82 and the hammerlock lever 70 is at the sixth As shown in the figure, this occurs when the armature 82 comes into contact with the first contact portion 100a after the pre-stroke, and the lever ratio between the armature 82 and the hammer lever 70 at this time is b1/a1
given a relatively small lever ratio.
At this time of initial contact, even if the prestroke is applied, the initial velocity of the armature 82 is a relatively small value, and its driving force is also a relatively small value. The hammerlock lever 70 can be reliably activated clockwise. Of course, the moving speed of the hammerlock lever 70 at this time is relatively small because the lever ratio is small, but
In the present invention, the armature 82 is further moved as shown in FIG.
Next, the second contact portion 1 of the hammerlock lever 70
00b, and at this time, the lever ratio of both becomes b2/a2, a large lever ratio is set, and the hammerlock lever 70
can significantly increase the rotational speed of During both predetermined rotations of the armature 82, the excitation force of the electromagnetic means 78 is applied to the armature 82.
2 is strongly attracted, the hammer lock lever 70 can be sufficiently rotated even with the set lever ratio, and has the advantage that quick response can be ensured.

As described above, according to the present invention, at the initial stage of contact between the armature and the hammerlock lever, the lever ratio between the two is made small to activate the hammerlock lever with sufficient responsiveness even with a small driving force.
After that, the lever ratio is changed by changing the point of contact with the armature, and as a result, in the suction state where a large driving force can be obtained, the hammerlock lever is rotated at high speed, and the driving force changes due to electromagnetic means. By skillfully combining this with lever ratio changes, we were able to obtain quick and responsive hammerlock lever rotation control action.

Furthermore, the combination of the electromagnetic driving force and the lever ratio makes it possible to lower the driving force for the electromagnetic means 78 than before, which reduces the current consumption of the printer, which is sufficient especially for battery-powered printers. It has the advantage of achieving a good printing effect.

Furthermore, as in this embodiment, the hammerlock lever can take both the printing standby position and the retracted position. A transmission mechanism with a pre-stroke is extremely beneficial, and similarly useful effects can be achieved with the armature and hammerlock lever mechanism with a pre-stroke as described in this embodiment.

Of course, in the present invention, the hammerlock lever can also be used with a structure having a conventional single print standby position without a retracted position, or with a structure without a pre-stroke.

[Effects of the invention] As explained above, according to the invention, the hammer lock lever is provided with at least two different abutting parts that abut the armature, and thereby the points of action of both can be adjusted in the unlocking process. This causes the hammerlock lever to be sufficiently activated with a weak driving force at the initial stage of contact.
When a large driving force is subsequently generated, the lever ratio between the two is changed so that the hammerlock lever rotates at high speed, making it possible to obtain an extremely efficient transmission action, resulting in excellent responsiveness and current consumption. It becomes possible to provide a printer device with less

[Brief explanation of drawings]

FIG. 1 is a perspective view of the main parts of a preferred embodiment of the printer device according to the present invention, FIG. 2 is an explanatory diagram of the main parts of the hammer reset section of FIG. 1, and FIG. Fig. 4 is an explanatory diagram of the main parts of Fig. 3, which shows when a reset pulse is output, Fig. 5 is an explanatory diagram of the action of Fig. 2, which shows the printing standby position of the hammer, and Fig. 6 is an explanatory diagram of the hammer lock lever. FIG. 7 is an explanatory view showing an initial contact state between the hammerlock lever and the armature, and FIG. 7 is an explanatory view showing an advanced contact state between the hammerlock lever and the armature. 10...Type drum, 16...Hammer, 20...
...Hammer spring, 28...Reset cam, 3
2...Standby cam, 36...Clear lever, 70...
... Hammerlock lever, 70a ... Release arm,
78...Electromagnetic means, 80...Solenoid, 82...
... Armature, 100a... First contact portion, 10
0b...Second contact portion.

Claims (1)

[Scope of utility model registration request] A type drum with multiple types formed on its outer periphery;
A plurality of hammers are arranged to face each digit of the type drum, a hammer spring that biases each hammer toward the type drum, and a hammer that engages with each hammer to lock and hold the hammer in a printing standby position. a lock lever; and an electromagnetic means having an armature that engages with the hammer lock lever to unlock the hammer and attracts and excites the armature by applying a printing command, the hammer lock lever making contact with the armature. 1. A printer device having at least two abutting portions, both abutting portions providing different lever ratios between the hammerlock lever and the armature.