JPH0234043Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention is a printer device, in particular, has a hammer mechanism in which a hammer spring impacts a printing type drum, and a reset cam moves the hammer against the hammer spring to standby for printing each type. The present invention relates to an improved intermittent start-up printer device of the state-holding type.

BACKGROUND ART Various printers are well known as output devices for information processing devices or calculators, etc., but there is a flying printer in which a hammer is driven to strike a type drum at a desired printing time 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, a hammer spring is used to stamp the hammer on the type drum, and a reset cam is used to release the hammer from the type drum after printing is completed and reset it to a printing standby state against the hammer spring. .

Intermittent start-up printers are well known as a type of printer of this type, and at the end of each print cycle,
Alternatively, the printing operation is stopped every time one line printing cycle is completed, auxiliary operations such as paper feeding are performed during this period, and the printing operation is restarted to perform the next cycle of printing.

However, this type of printer requires a reset pulse switch to accurately detect the end of one print cycle in synchronization with the type drum.
At least one swinging lever must be provided to operate the switch in conjunction with the rotation of the type drum, resulting in a complicated structure.

Purpose of the Invention The present invention has been devised in view of the above-mentioned conventional problems, and its purpose is to provide an improved printer device that can operate a reset pulse switch with a simple structure.

Composition of the Invention In order to achieve the above object, the present invention includes a type drum having a plurality of type characters formed on its outer periphery, a plurality of hammers arranged facing each other for each digit of the type drum,
A hammer spring biases each hammer toward the type drum, and a hammer spring rotates in synchronization with the type drum to release each hammer to a printable state at a predetermined timing according to the type arrangement of the opposing digit, and also releases each hammer after printing. A reset cam that rotates and resets each hammer to a printing standby position against a hammer spring, a retraction cam that rotates each hammer to a retracted position where it does not come into contact with the reset cam against the hammer spring every printing cycle, and a retraction cam that engages with the hammer. a hammer lock mechanism that locks and holds the hammer in the print standby position and the retracted position and releases the lock upon application of a print command, and swings the retract cam every printing cycle of the type drum; It is characterized by operating a reset pulse switch using a lever.

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

1 and 2 show preferred embodiments of the printer device according to the present invention, and the printer shown in the figure is provided with one electromagnetic means for every three digits to release the hammer from the print standby state based on a print command. 3 digits 1
Electromagnetic means type printers are used.

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.

In addition, the example shows an ink roller type printer,
An ink roller 26 that rotates in contact with the type drum 10 supplies ink to adhere to each type character, and 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 to a printing standby position.
The reset camshaft 30 forms a part of the reduction train 12 in order to rotate in synchronization with the reset camshaft 30 .

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 at 1/2 in the row direction within a type set of 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 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 3
0 is set so that 1/2 revolution corresponds to one character pitch on the character drum 10.

The reset cam 28 has a reset portion on its outer periphery, and when the reset portion comes into contact with the hammer 16, the hammer 16 is moved against the hammer spring 20 to a printing standby position away from the type drum 10 to perform printing. In the example, the reset cam 28
has two reset portions 28 along its circumferential direction.
a, and the recessed portion 2 of the reset cam 28 during printing.
Reset shoulder 16a of hammer 16 that has fallen into 8b
can be pushed up and reset to the print standby position by one of the reset portions 28a.

In the present invention, the hammer 16 can take a retracted position in addition to the printing standby position described above, and in this retracted position, the hammer 16 is rotated against the hammer spring 20 to a position where it does not come into contact with the reset cam 28. , 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 retracting action, in the present invention, a retracting cam 32 is provided near the hammer 16, and in the embodiment, all the hammers 16 are simultaneously rotated to the retracting position by the retracting 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, the clear cam 40 rotates the retraction cam 32 via the roller 38 and the clear lever 36 for each rotation of the type drum 10, that is, for each printing cycle.
At the end of printing, the evacuation action is performed every printing cycle as described above. 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 an intermittent startup printer in this invention, 1
It is desired to quickly stop the type drum 10 at the end of the printing cycle, and for this purpose, a brake mechanism using the swinging of the clear lever 36 is employed in the embodiment. That is, a brake drum 46 is fixed to the reset camshaft 30 that forms the drive wheel train of the type drum 10, and a brake shoe 48 is fixed to the clear lever 36, and the reset camshaft 30 is fixed by friction between the two. A rapid braking force is applied to the type drum 10, and the type drum 10 can be brought to a sudden stop. 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 an initial torque applied in advance, and the brake shoe 48 is connected to the stop bar 50 when not being controlled. The brake drum 46 is prevented from coming into contact with the brake drum 46 by being brought into contact with the brake drum 46.

A feature of the present invention is that the printing reference signal can be extracted by 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 includes two contact pieces 5 that sandwich an insulating substrate 52 and have one end fixed.
4 and 56, and both contact pieces 54 and 56 have a biasing force in a direction in which they come into close contact with each other. A switch operator 58 made of a wire spring held by the clear lever 36 described above engages with one of the contact pieces 54, and both contact pieces 54 and
56 contact state is 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 the both contact pieces 54,
56 are also positionally regulated by stopper pins 66 and 68, respectively.

Figure 3 shows the normal state, with the clear lever 36
is rotated counterclockwise by a spring 42 to a position where it abuts against a stopper (Fig. 1).
As a result, the switch operator 58 pushes up the contact piece 54 until it comes into contact with the stopper pin 66, and at this time,
Since the other contact piece 56 is regulated by a stopper pin 68, both contact pieces 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. 4, the switch operator 58 is separated from the contact piece 54, and a reset pulse can be output by the contact between both the contact pieces 54 and 56.

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

In this embodiment, it is necessary to hold the hammer 16 in the printing standby position and the retracted position as described above. is maintained.

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 in a bifurcated manner 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 a hammer 16, and can independently hold or release the hammer 16 separately from other levers. In the present invention, the plurality of hammerlock levers 70 are grouped together, and in the embodiment, three hammerlock levers 70 are commonly controlled by electromagnetic means, but the application of a printing command to the solenoid is After being released, each hammer lock lever 70 independently cooperates with the corresponding hammer 16, making it possible to eliminate printer friction losses 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.
A first holding part that holds the hammer 16 in a print standby position and a second holding part that holds the hammer 16 in a retracted position are formed.
The holding portion is formed by a first holding step 74 provided on the holding arm 16b of the hammer 16, and similarly the second holding portion is formed by a second holding step 74 provided on the holding arm 16b of the hammer 16.
It is formed by a holding stage 76. 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 deeply in the retracted position (FIG. 2). By holding the hammer 16 in this deeply retracted state, it becomes possible to completely eliminate contact between the hammer 16 and the reset cam 28, as shown in FIG.

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-digit hammer lock lever 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. Rotate 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.

A feature of this embodiment is that 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 shown in FIG. 2 is not energized. During the pre-stroke in which the armature 82 moves through the play gap P when the electromagnetic means 78 is energized, the armature 82 is given an initial velocity sufficient to disengage the hammerlock lever 70. Therefore, although the stroke of the armature 82 becomes longer in order to position the hammer 16 at both the printing standby position and the retreat position, the armature 82 has a large initial velocity due to free flight during the pre-stroke at the initial stage of suction. This allows reliable release of the hammer lock.

The embodiment of the present invention has the above configuration, and its printing and hammer reset functions will be explained below.

The printing function of this embodiment is the same as the conventional one,
The hammer 16 selected by the reset cam 28 and the electromagnetic means 78 is driven toward the type drum 10 to print the desired selected type. The hammer 16 is the reset cam 2.
Generally, in this type of printer, the reset cam 28 is rotated to ensure the engagement between the hammer 16 and the armature 82.
The reset cam 28 is configured to push up and reset the hammer 16 by more than the amount necessary for holding and engaging the hammer 16. Therefore, each time the reset cam 28 engages the hammer 16, a collision and contact action occurs, resulting in significant wear and noise. However, in the present invention, since the hammer 16 is retracted from the reset cam 28 by the retracting cam 32 every printing cycle, it is possible to completely eliminate the above-mentioned contact. Simultaneously with this retracting action, the clear lever 36 can perform a reset pulse output action.

FIG. 6 shows a timing chart of the embodiment, in which one desired print and paper feeding are performed within the printing cycle T from time _t1 to time _t7 . That is, at time _t1 , the motor 14M is energized, and thereafter, character selection and printing are performed by the reset pulse RP obtained from the reset pulse switch and the character pulses _CP1 and _CP2 obtained from the reading head 24. . Therefore, the actual printing section
Between _t3 and _t4 , printing and reset action of the hammer 16 to the printing standby position by the reset cam 28 are performed. Therefore, during the printing section _t3 to _t4 , the hammer 16 is held at the printing standby position immediately after printing, so that the hammer 16 and the reset cam 28 do not repeatedly come into contact with each other in this section as in the past. Become. However, in the present invention, the evacuation action by the evacuation cam 32 described above is performed between time t ₄ and time _{t 6} at the same time as the paper feed PF after printing is completed.
RS is performed, and due to this retraction action, hammer 1
As shown in FIG. 2, the hammer 6 is retracted to a position where it does not come into contact with the reset cam 28, and this non-contact state is maintained continuously until the hammer 16 is used for printing. Also, at this time, the reset pulse output by the clear lever 36 is achieved. As is well known, the upper digits of all digits in a printer are rarely used for printing, and in such cases,
According to the present invention, it is possible to hold a girder, which has conventionally been subjected to repeated and useless contact, completely without contact.

Effects of the Invention As explained above, according to the present invention, since the reset pulse switch is operated simultaneously using the swinging of the clear lever that performs the retracting action of the hammer, it has the advantage of simplifying the structure.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main part showing a preferred embodiment of a printer device to which a reset mechanism according to the present invention is applied, FIG. 2 is an explanatory view of a main part of the hammer reset section of FIG. 1 is an explanatory diagram of the main parts of the reset pulse switch, FIG. 4 is an explanatory diagram of the operation in FIG. 3 showing when the reset pulse is output, FIG. 5 is an explanatory diagram of the operation in FIG. FIG. 6 is a timing chart of the embodiment. 10...Type drum, 16...Hammer, 20...
...Hammer spring, 28...Reset cam, 3
2...Evacuation cam, 36...Clear lever, 54,
56... Reset pulse switch, 70... Hammerlock lever, 74... First holding part (print standby position), 76... Second holding part (retracted position), 7
8...Electromagnetic means, 80...Solenoid, 82...
Armathya.

Claims (1)

[Scope of utility model registration request] A type drum with multiple types formed on its outer periphery;
A plurality of hammers are placed facing each digit of the type drum, a hammer spring biases each hammer toward the type drum, and a hammer spring rotates in synchronization with the type drum to align each hammer with the type arrangement of the opposing digit. a reset cam that releases each hammer to a printable state at a predetermined timing and rotates and resets each hammer to a printing standby position against a hammer spring after printing, and a reset cam that rotates each hammer against a hammer spring for each printing cycle a retraction cam that rotates to a retraction position where it does not come into contact with the printer; and a hammer lock mechanism that engages with the hammer and locks the hammer in the printing standby position and the retraction position and releases the lock upon application of a printing command. 1. A printer apparatus comprising: a reset pulse switch actuated by a clear lever which swings said retraction cam every printing cycle of a type drum.