JPH03183577A - Micro printer - Google Patents

Abstract

PURPOSE:To effectively prevent wear of a contact surface of a yoke of an electromagnetic clutch with an electromagnetic plate without rotating a clutch gear of the clutch if a type drum is stopped by interposing a spring clutch between a drive motor and the gear of the clutch. CONSTITUTION:An electromagnetic clutch 5 is arranged near a ratchet 3, and has a clutch gear 6 for transmitting a rotary drive force to a type drum. A spring clutch 18 for transmitting a rotary force from a drive motor is connected to the gear 6. If the drum is stopped at a predetermined position, a load is applied to the output gear of the clutch 18 to idle a drive gear, and the rotary drive force is not applied to the output gear. Accordingly, the gear 6 is not rotated to effectively prevent the wear of the contact surface of the yoke 7 of the clutch 5 with an electromagnetic plate 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microprinter, and more particularly to a microprinter that prints 11 characters using a type drum having a plurality of type characters formed on its outer periphery.

[Conventional technology]

FIG. 3 shows a conventional microprinter. In order to print different colors on the outer circumferential surface of the cylindrical type drum 1, two sets of types (cesses shown) are divided into half circumferences. It is arranged as follows. In addition, between each set of type characters, in order to perform non-rD type operations such as paper feeding, there are two portions where no type is formed, with a diameter of approximately IJ1t1.
It is formed so as to face 1. Then, a predetermined type on the type drum 1 is stopped and ejected facing the platen, and a printing mechanism (
(not shown), the type is immediately directed toward the paper and the platen for printing.

At one end of the type drum 1 (see IV1), a ratchet 3 is installed coaxially with a beveled ratchet 3 on the outer periphery of which is formed a lug and teeth 2 corresponding to the sowing of each type. On the outer periphery of Rabutu chotsu 1-3, in contrast to the part where the typeface of Kanji Uji Dora t1 is not formed, there are two pieces formed deeper than the width between 1 and 2. The notches 4 are shaped like lδ so that they face each other almost diametrically.Between the type drum 1 and the radiot 3, there are provided a gear (not shown) and an R switch, respectively. The gear, code plate rotating gear J3, and full cam body are arranged coaxially (=jt:J).

In addition, the transmission gear includes a drive (not shown).
This will continue, and this driver fIJtl--ta
J? By this, the type drum 1 is rotationally driven via the transmission gear.

In addition, an electromagnetic ramp 5 is disposed near the active drum 1, and this electromagnetic clutch 5c is connected to the driving motor 1, which drives the active drum 1.
Clutch driven by 7 trains and a separate gear train
Aro is on the right. The electromagnetic clutch 5 is integrally driven to rotate by the electromagnetic clutch 5, the G31, and the gangway gear 6.]
A yoke 7 is attached to the yoke 7, and an electromagnetic plate 8 is coaxially disposed at the end of the yoke 7. The electromagnetic plate 8 is rotated counterclockwise in FIG. 3 together with the cork 7 by an MJ electric current to an electromagnetic coil (not shown) of the electromagnetic clutch 5.

Between the electromagnetic clutch 5 and the ratchet 3, a selection lever 10 having an engagement pawl 9 formed at its tip that engages with the loveet teeth 2 is rotatable about its central part on a pivot @ 10a. It is connected to the electromagnetic plate 8 by a pin 10b protruding from the rear end of the selection lever 1°. This selection lever 1o is moved to the third position by the electromagnetic plate 8 [11'lii] when the electromagnetic clutch 5 is energized.
(The engaging pawl 9 is rotated in the 15-degree direction by 43 degrees, so that the engaging pawl 9 is selectively engaged with the ratchet teeth 2 or the notches 4 of the ratchet 3. Upon stopping, the selection lever 1o is moved in the opposite direction by a self-returning spring (not shown), so that its engagement can be released.

The control gear 1 is engaged with the intermittent gear that rotates integrally with the type drum 1, and the control gear 1 is connected to the control gear 1 which drives the paper feed U-ra (not shown). The feed l'712 is engaged. Furthermore, the ff and Iff gears 11 and 17i1 of the selection lever 10 are
．． : iJ, the locking pawl 13 is formed protrudingly, and the above-mentioned a
, II A locking protrusion 14 is formed at a position corresponding to the locking pawl 13 of the Iff gear 11. The engaging claws 9 of the selection lever 10 of the locking claws 13G, L, and 1 are engaged with the love mounts 2 of the love gills 1 to 3.
(Yo, the engagement of the control 1A 11 with the engagement 1L protrusion 14 was not steered forward, and the engagement claw 9 of the M selection lever 10 engaged with the notch groove 4 of the lovette 3) 1 ti during printing operation
t, the engagement with the locking pin 14 is released.

Furthermore, dark book activity'? ]-do plate rotating gear of drum 1,
A code plate 15 is engaged with the code plate 15, and on one side of the code plate 15, a code pattern 16 corresponding to each character of the type drum 1 is formed in an 8-pitch radial pattern. Cow position pattern 16 a indicating position
Jj and common patterns 16b are respectively formed. The code plate 15 also includes a contact 17a for detecting the code pattern 16 with a half-pitch phase difference;
17b, and a contact point 17 that detects the reference position d pattern 16a.
A contact 17d for CJ and common pattern 16b is provided.

In the conventional microphone "1 printer", the contact point 17Fl that contacts the code pattern 16 of the code plate 15
, 17b output a code signal 1 corresponding to the printed characters, and based on this signal 1.1, the electromagnetic coil of the electromagnetic clutch 5 is energized to attract the electromagnetic plate 8 to the yoke 7 Q, and this electromagnetic plate 1- 8, turn the selection lever 10 by 1h,
By engaging the engaging pawl 9 of the selection lever 1o with the ratchet teeth 2 of the ratchet 3, the type drum 1 is stopped at a predetermined active position δ. In this state, a desired print is made on the paper by a printing mechanism such as a hammer (not shown).

When performing a non-printing operation of the paper feed tray, the electromagnetic ramp 5 is energized and the selection lever 10 is simultaneously moved via the electromagnetic plate 8. 3 is engaged with the notch !j/+4, and the engagement between the locking pawl 13 of the selection lever 10 and the locking 11 protrusion 14 of the f and II control gear 11 is released.

When the engagement between the latch 13 and the latch protrusion 14 is released, the fl++J gear 11 is rotated, and 1) the paper is fed a predetermined m (one line) while avoiding rotation of the paper feed gear. J. It's being eaten by sea urchins.

[Problems that the invention solves and drowses]

However, ^11 Conventional microphone [L printer]
(1. At the time of printing and) At 1 mark 7115, the electromagnetic ramp 5 is driven to rotate the selection lever 10 via the ffi (a '7'' rail 1-8 υ, the engagement claw 9 of the selection lever 10 By engaging the love object 3, the type drive l
＼1 to a predetermined position 7 (K11lb) However, since the driving gear of the electromagnetic clutch 5 is transmitted with a rotational force of -9, the yoke 7 is moved to the electromagnetic plate 8.
The electromagnetic plate 8 is rotated while being in contact with the electromagnetic plate 8 which is stopped against the attraction force of the yoke 7, and the contact surface between the yoke 7 and the electromagnetic plate 8 is significantly worn, which reduces the lifespan of the electromagnetic clap 5. Furthermore, due to the abrasion powder generated by the wear, the suction operation of the electromagnetic plate 8 is not performed properly, resulting in malfunction of the selection lever 10.

The present invention has been made in view of these points, and it is an object of the present invention to propose a microphone 11 printer that can stop the electromagnetic clutch when the type drum stops, thereby preventing wear of the electromagnetic clutch. be.

[Means to solve the problem]

In order to achieve the above object, the microprinter according to the present invention is provided with a rotatable type drum having type formed on its outer peripheral surface, and a method for selecting desired type on the printing drum and selecting the type on the type drum. A selection lever is rotatably provided to perform a non-printing operation corresponding to a portion where there is no printing, and a clutch gear is provided to transmit the rotational force of a drive motor to rotationally drive the selection lever. A3 is a micro printer equipped with an electromagnetic clutch that rotates vJ, and the drive motor and 1) t1
Between the clutch gear of the electromagnetic clutch and the clutch gear of the electromagnetic clutch, an output gear connected to the clutch gear of the drive 1a connected to the drive motor and the clutch gear of the electromagnetic clarifier f is connected, and a constant force is connected to the output gear. Its feature is that a spring clutch is provided which is idled at ff:'l when torque is applied.

[Problem] According to the present invention, when printing, the electromagnetic clutch is driven based on the signal BB corresponding to the type, and the selection lever is simultaneously moved to select the desired type. As soon as the type drum is stopped (the desired print is made on the paper), a load is applied to the output gear of the spring clutch, causing the drive gear to idle, and rotational driving force is transmitted to the output gear. Clutch-1 of the electromagnetic clutch
Since the yoke of the electromagnetic clutch is not rotated, wear of the contact surface between the yoke of the electromagnetic clutch and the electromagnetic plate can be reliably prevented, and the life of the electromagnetic clutch can be extended. Moreover, since abrasion powder is not generated due to wear, the electromagnetic clutch can be properly driven and the selection lever can be operated reliably.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

FIGS. 1 and 2 show a single embodiment of the present invention, in which a GJ is formed at one end of a type drum (not shown), and a rub 1 tsut mountain 2 corresponding to the straightness of each type is formed on the outer periphery. Radietsu l-3 is installed coaxially, and this loveet 3
On the outer periphery of the type drum, there are notches 4 formed deeper than the vortices between the Labue teeth 2, which correspond to the two parts of the type drum where no type is provided, and which are diametrically opposed to fjJ.
9 J: Sea urchin formation.

Further, an electromagnetic clutch 5 is disposed near the latch 3, and this 716ti clutch 5 is connected to a latch gear 6 for transmitting driving force to the type drum at the same location.
That's right. A yoke 7 is attached to the tip of the rotating shaft of the clutch gear 6, and is driven integrally with the clutch gear 6.
An electromagnetic coil (not shown) is accommodated. Furthermore, 1
On the end face side of Komaki 31-ri 7, there is an electromagnetic plate 8 Ii'
It is arranged in the shape of an iI axis, and this electromagnetic plate No. 8,
By energizing the main coil 1v1, it is attracted to the yoke 7 and rotated in the opposite direction of the force in FIG. 1 by the yoke 7 and b.

Further, the electromagnetic plate 8 is provided with an engaging pawl 9 at its tip, and the other end of the selection lever 10, which is co-moveable with its central portion centered around I*10a, is connected to a pin 10.
b, this selection lever 10 is rotated by the rotation of the electromagnetic plate 8, and the engaging pawl 9 is connected to the love/it vA2 or disconnection of the radial J-touch 1-3. It is designed so that it can be selectively engaged and disengaged depending on the notch.

A spring clutch 18 as shown in FIG. 2 is connected to the clutch gear 6 of the electromagnetic clutch 5, which transmits rotational force from a drive motor (not shown). This spring clutch 18 is on the right side of the drive gear 19. A drive shaft 20 is integrally fixed to the drive gear 19, and the output gear 21 is engaged n22 on the outer peripheral side of the drive shaft 20. This engagement tube 2
2 is formed with a locking R23 extending in the U and axis/J directions.A coil spring 24 has a hook portion 24a on the outer circumferential side of the drive shaft 20 and the inner circumferential side of the engagement tube 22. It is attached so as to be engaged with the locking groove 23. Further, the rotational driving force of a drive motor (not shown) is transmitted to the drive gear 19.
1 The clutch gear 6 of the electromagnetic clutch 5 is engaged. When a certain torque is applied to the output gear 21, the coil spring 24 slips with respect to the drive shaft 20 and no longer transmits rotational force to the clutch gear 6.

Next, the operation of this embodiment will be explained.

First, in the initial position, the selection lever 10 is not engaged with the ratchet 3, as shown in FIG.
The driving gear 19 of the electromagnetic clutch 5 is rotated, and the same rotation of the drive shaft 20 is transmitted to the engagement n22 through the coil spring 24 to rotate the lj gear 21, and the yoke is transmitted through the clutch gear 6 of the electromagnetic clutch 5. Same as 7 + I: Spit.

Then, as shown in Fig. 1 (b) of C1, during this half rotation, the code board outputs a bind-off corresponding to 115 characters, and based on this (,: S:), the above is printed at the desired character position. The electromagnetic coil of the electromagnetic clutch 5 is energized to cause the electromagnetic plate 8 to be attracted to the yoke 7. This causes the selection lever 10 to rotate, and the engagement pawl 9 of the selection lever 10 is engaged with the radiet of the radiot 3. By engaging with the south part 2, the active drum 1 is moved to a predetermined active position.At this time,
The rotation of the clutch gear of the electromagnetic clamp 5 is also stopped, and the 0 direction is applied to the output key 721 of the spring clutch 18, so that the inner circumferential surface of the coil spring 24 and the outer circumferential surface of the drive shaft 20 are A prip intervenes between the two, and the drive shaft 7
19 slips and rotates idly, and rotational driving force is no longer transmitted to the output gear 21. In this state, desired printing is performed on the paper using a printing timing such as a hammer (not shown), and in this way, half a digit is printed while the type drum rotates half a rotation.

When feeding paper, the electromagnetic clutch 5 is energized to rotate the electromagnetic plate 8, and the engaging pawl 9 of the selection lever 10 is engaged with the notch groove 4 of the ratchet 3. The feed drive gear 19 is rotationally driven to increase the predetermined paper feed by 11%.

By repeating the above operations, the required number of lines can be printed.

Therefore, in this embodiment, when the type drum is stopped at a predetermined position, a load is applied to the output gear 21 of the spring clutch 18, causing the drive gear 19 to idle.
Since the rotational driving force is no longer transmitted to the output gear 21, the clutch gear 6 of the electromagnetic clutch 5 is not rotated, and tH
! Abrasion of the contact surface between the yoke 7 and the electromagnetic plate 8 of the first clutch 5 can be reliably prevented, and the life of the electromagnetic clutch 5 can be improved. Moreover, I! ? Since there is no interference of abrasion particles caused by the 8 holes, the suction operation of the electromagnetic plate 8 can be performed properly, and the selection operation of the selection lever 10 can be performed reliably.

However, the present invention is limited to the above-mentioned embodiments.

[Effect of excuse]

[As stated above, the microprinter according to the present invention has the following features:
Since a spring clamp is interposed between the drive morph and the clutch gear of the electromagnetic clara f, the li
'When the 1-shaped driver 11 is stopped, the clutch gear of the electromagnetic clutch is not rotated, and wear and tear on the contact surface between the RLI magnetic shoe clamp and the electromagnetic loop 1 can be reliably prevented. It is possible to improve the size of the electromagnetic clutch. In addition, since the abrasive powder that rises to [[] is not generated, the electromagnetic clutch can be operated properly, and the selection lever can be operated reliably.

[Brief explanation of drawings]

Figures 1 and 2 respectively show an embodiment of the microprinter of the present invention for driving 1m1t.
) I'm alive? A plan view showing the selected state, Figure 2 [An exploded perspective view of the spring clutch, Figure 3 is a conventional microphone 1]
FIG. 3 is a plan view showing the drive v1 component of the printer. 2...Ratchet tooth, 3...Radiet, 4...
Notch groove, 5... Electromagnetic clutch, 6... Clutch gear, 7...=1-ri, 8... Electromagnetic plate, 10...
...Selection lever 18...Spring clutch, 19.
... Drive 1, 21... Output gear.

Claims (1)

[Claims] A type drum having type characters formed on its outer peripheral surface is rotatably provided, and a non-printing operation is performed in response to desired type selection of the type drum and a portion of the type drum where type characters are not formed. A microprinter comprising a rotatable selection lever, a clutch gear for transmitting the rotational force of a drive motor to rotationally drive the selection lever, and an electromagnetic clutch for rotating the selection lever under energization control. A drive gear connected to the drive motor and an output gear connected to the clutch gear of the electromagnetic clutch are provided between the drive motor and the clutch gear of the electromagnetic clutch, and a constant speed is provided to the output gear. A microprinter characterized by having a spring clutch that is idled when torque is applied.