JPS61163879A - Printer - Google Patents

Abstract

PURPOSE:To reduce the number of drive sources by arranging the first type wheel, a selection ratchet, the second type wheel and a selection ratchet so that the phases of the first tooth block and the second tooth block may differ. CONSTITUTION:The phase of the first tooth block on the first selection ratchet and that of the second tooth block on the second selection ratchet are arranged, for instance, by shifting them by 1/2 pitch from each other. The selection ratchets 25, 26 is allowed to continue rotating without being locked, whilst the other is locked to a standstill. Thus type elements belonging to the first type wheel 13 and those to the second type wheel 14 can be set at designated position. In addition, the locking of the selection ratchets 25, 26 can be realized by a single electromagnetic clutch incorporating an electromagnetic coil 56, a yoke 61 and a rotating element 63. Accordingly, the number of drive sources to lock the selection ratchets 25, 26 and other selection ratchets is minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a printer, and more particularly to a printer having an improved type selection mechanism that locks rotation of a type wheel.

[Background of the invention]

Conventionally, a plurality of type wheels having type bodies on the circumferential side are mounted on a rotating shaft arranged parallel to a platen around which recording paper is wound.
A printer has been proposed in which the printers are installed in eight rows, etc., and the rotation of each of the nine type wheels is individually controlled to perform desired printing. In this printer, a selection ratchet is formed in the body of each type wheel, and each of these selection ratchets is provided with a lockable locking pawl.

Further, a drive source such as a solenoid is provided for driving the locking pawls so that the locking pawls engage with the selection ratchet or so that the locking pawls and the selection ratchet are disengaged.

That is, in this conventional printer, one solenoid is required to stop the rotation of one type wheel, and the number of parts and assembly steps are large.

Therefore, it requires a considerably large space for arranging the parts, increases the manufacturing cost, and has the disadvantage of being restricted in the design of the arrangement of one part.

[Purpose of the invention]

The present invention has been made in view of the actual state of the prior art, and its purpose is to provide a printer that can reduce the number of drive sources provided for stopping the rotation of the type wheel. It is in.

[Summary of the invention]

To achieve this objective, the present invention has one rotating shaft.

a first type wheel attached to this rotating shaft and having a first type body on one circumference side; a first selection ratchet having a first tooth portion formed therein; and a second type ring attached to the rotating shaft and connected to the first type ring and having a second type body on the 91st circumference side. and a second selection ratchet that rotates integrally with the second type ring and has a second tooth portion formed on the circumferential side at a position corresponding to the second type body.

For example, the phase of the second tooth part is shifted by about 1/2 pitch from the phase of the first tooth part so that the phase of the first tooth part is different from the phase of the second tooth part. The present invention has a configuration in which a first type wheel, a first selection ratchet, a second type wheel, and a second selection ratchet are arranged.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A printer of the present invention will be explained below based on the drawings. 1st
The figure is an exploded perspective view showing the main parts of an embodiment of the printer of the present invention, and FIGS. 2(a) and 2(b) show the engagement relationship between the rotating shaft and the drive pawl provided in the embodiment shown in FIG. 1. Construction diagram showing the 3rd
Figures (a), (b), and (c) are explanatory views showing the engagement relationship between the selection ratchet, the locking pawl, and the spring member provided in the embodiment shown in Figure 1.

In FIG. 1, C1■1 is a rotating shaft, which is provided with a V-shaped notch 12 on the circumferential side along the axial direction, and this rotating shaft 11 is parallel to a platen on which recording paper (not shown) is wound. Placed. Note that the notch 12 has a first surface 12a extending toward the axis O of one rotation @ll as shown in FIG. 2(b).
It is equipped with

Reference numerals 13 and 14 denote a first type ring and a second type ring attached to this rotary shaft 11, and a plurality of first type bodies and a plurality of second type bodies are provided on the circumferential side 15° and 16, respectively. , is provided with bearings 17 and 18 in the center of which the rotating shaft 11 is inserted. Bearing t7. A void portion 19.20 is formed in a part of ta,
Further, a protrusion 21.22 is provided on the outer periphery of the bearing 17.18, and a type ring 13.14 near the bearing 17.18 is provided.
The portions are provided with shafts 23,24.

In addition, numbers 25 and 26 are provided separately from the type wheels 13 and 14, and are fitted onto these type wheels 13 and 14 to form the type wheels 1.
3.14, a first selection ratchet and a second selection ratchet that rotate integrally with each other, each with a type ring 13.1 in the center.
It has holes 27 and 28 into which the bearings 17 and 18 of No. 4 are inserted.
It has first teeth 29 and second teeth 30 on the circumferential side and at positions corresponding to the type bodies of the type wheels 13,14.

Further, 31 and 32 are Kl between the type wheel 13 and the selection ratchet 25 and between the type wheel 14 and the selection ratchet 26, respectively.
l! A driving claw that transmits the rotational force of the rotary shaft 11 to the type wheels 13 and 14, and is inserted into the shafts 23 and 24 provided in the center of the type wheels 13 and 14 so as to be relatively rotatable.
3, 34 and a notch 12 of the rotating shaft 11.
a rigid first arm 37.38 having a protrusion 35.36 that can be engaged with the body; and a second elastic arm 39.
It consists of 0. Also, protrusions 35 and 36.

Notch portion 12 of rotating shaft 11 shown in FIG. 2(b) mentioned above
and second surfaces 41 and 42, respectively, which are adaptable to the first surfaces 12a.

Note that the selection ratchets 25 and 26 described above are shown in FIG.
), (b), recesses 43 and 44 into which the drive claws 31 and 32 can be inserted are provided on the side facing the type ring 13 and 14.
and the tip 45 of the first @37.38 of the drive pawl 31.32.
．． 46 is movably engaged, that is, the drive claw 31
．． A guide portion 47° 48 is provided for rotating the shaft 32 around the axis 23° 24. Further, the projections 21.22 of the bearings 17.18 described above constitute a restriction portion that restricts the approach of the second arms 39, 40 of the drive claws 31.32 to the bearings 17.18.

The above-mentioned type wheels 13, 14, drive claws 31, 32° selection ratchets 25, 26 are attached to the rotating shaft 11 in the following manner. That is, for example, the first type ring 1 is attached to the rotating shaft 11.
The bearing 17 portion of No. 3 is inserted, and then the hole No. 3 of the drive pawl 31 is inserted.
3 is inserted into the shaft 23 of the first type wheel 13, and the first arm 3
The protrusion 35 of No. 7 is inserted into the cavity 19 of the bearing 17, and then, for example, this protrusion 35 is engaged with the notch 12 of the rotating shaft 11. Further, the second arm 39 is mounted so as to engage with the protrusion 21 of the bearing 17. Then, the hole 27 of the first selection ratchet 25 is inserted into the rotating shaft 11, and the first selection ratchet 25 is inserted into the first selection ratchet 25, whose first teeth 29 are provided on the circumferential side of the first type ring 13. to correspond to the position of the typeface.

It is fitted into the first type ring 13.

Similarly, the bearing 18 of the second type wheel 14 is attached to the one-rotation shaft 11.
Once the part is inserted, the six 34 of the drive pawl 32 is inserted into the shaft 24 of the second type wheel 14 and the protrusion 36 of the first arm 38 is inserted.
is inserted into the cavity 20 of the bearing 18, and then, for example, the protrusion 36 is engaged with the notch 12 of the rotating shaft 11. Further, the second arm 40 is mounted to engage the protrusion 22 of the bearing 18, and the second selection ratchet 26 is
The respective positions of the second tooth portions 30 correspond to the second type wheel 1.
It is fitted into the second type wheel 14 in a manner corresponding to the position of the second type body provided on the circumferential side of the letter 4.

And the above-mentioned first type wheel 13. First selection ratchet 25, second type wheel 14. Second selection ratchet 2
6 is such that the phase of the first tooth portion 29 and the phase of the second tooth portion 30 are different, for example, by 172 pitches from each other, that is, the second tooth portion is placed at a position corresponding to between the first tooth portions 29. It is arranged on the rotation axis ll so that the tooth portion 30 is located.

Also, 49.50 shown in Fig. 1 is the 1 selection ratchet 25
, 26.

With the second locking pawl, the teeth 29 of the selection ratchet 25, 26
．． 30 with the claws 51 and 52 at the tip.
・Hole 54゜55 in which the rotating shaft 53 is inserted in the center.
have.

56 is a driving source such as an electromagnetic coil, and a rotating shaft 53 is located in the center.
has a six 57 which is rotatably inserted. 58 is
This holding stand holds the electromagnetic coil 56, and the electromagnetic coil 5
6 is held in a fan-shaped protrusion 59 formed on the upper part of the holding table 58. Although not shown, there is a slightly larger fan-shaped notch at the bottom of the first locking claw 49, which corresponds to the shape of the protrusion of the holding base of the adjacent electromagnetic coil. A slightly larger fan-shaped notch 60 corresponding to the shape of the protrusion 59 of the holding base 58 is formed at the lower part of the locking pawl 50 .

61 is a yoke attached to surround the electromagnetic coil 56, and 663, which has a notch 62 on one side, is a rotating body made of a non-magnetic material, into which the rotating shaft 53 is fitted. It has a protrusion 65 on the circumferential side that engages with the notch 62 of the yoke 61. This rotating body 63 rotates together with the rotating shaft 53. The above electromagnetic coil 56. The yoke 61° rotating body 63 constitutes a driving means for rotating the first locking pawl 49 and the second locking pawl 50, that is, an electromagnetic clutch.

Further, 66.67 indicates a state in which the locking claw 49.50 is engaged with the selection ratchet 25.26, and a state in which the selection ratchet 25.26 is engaged with the selection ratchet 25.26.
26 and a lower portion 68, 69. 26 of the distal end of the locking pawl 49. upper parts 72.7 respectively engageable with upper parts 70.71;
3 and a lower part 74.75.
7 each.

These locking claws 49, 50 . When assembling the electromagnetic coil 56 and the like, as described above, the protrusion 65 of the single-turning body 63 attached to the electromagnetic coil 56 is arranged so as to fit into the notch 62 of the yoke 61, and the locking claws 49, 50
is rotatable about the rotation shaft 53, and the locking pawl 50 is arranged so that its notch 60 fits into the protrusion 59 of the holding base 58.
Also.

The locking claw 49 is also attached to the adjacent electromagnetic coil in the same way, and the rotating body 63 is attached to the rotating shaft 53 as described above.
It is installed integrally with the In this assembled state, the body portions 78,79 of the locking pawls 49,50 are aligned with the yoke 6.
1 so as to face each of the side end surfaces 80 and 81 of 1.

Although not shown, two type wheels 1 as described above are used.
3.11 Selection ratchet 25, 26, drive pawl 31, 32
, and two locking claws 49°50, spring members 66,67
, L electromagnetic coils 56, holding base 58, yoke 611 and rotating body 63 are connected to the rotating shaft 11. A plurality of sets, for example nine sets, are arranged along the respective axial directions of the rotation shafts 53.

The operation of the embodiment configured as described above is as follows.

That is, as shown in FIG. 3(a), the locking claw 49.5
Spring member 66.67 in the upper part 70.71 of the distal end of 0
In the standby state in which the lower portions 74, 75 of the folded portions 76 + 77 are engaged, and as shown in FIG.
The protrusion 3 of the drive claw 31, 32 is attached to the notch 12 of the rotating shaft 11.
5.36 is in the engaged state, and the rotating shaft 11 is moved by, for example, a motor (not shown) in the direction indicated by the arrow 8 in FIG. 2(a).
When the rotating shaft 53 rotates in two directions, that is, in the direction of the arrow 83 in FIG. 3(a), and the first rotation shaft 53 rotates in the direction of the arrow 84 in FIG. As shown in (a), the first surface 12a of the notch 12 presses the second surface 41.42 of the drive claw 31.
, 3j, and this rotational force is further transmitted from the tip 45.46 of the first arm 37.38 of the drive pawl 31.32 to the guide portion 47.48 of the selection ratchet 25.26, thereby The selection ratchet 25.26 also transmits the driving force from the hole 33.34 of the drive pawl 31.32 to the shaft 23.24 of the type wheel 13.14.
rotates integrally with the rotating shaft 11 in the direction of the arrow 82. During this period, the rotating body 63 and the yoke 61 rotate with the rotation of the first rotation shaft 53, but since the rotational force of the rotation shaft 53 is not transmitted to the locking pawls 49 and 50, these The locking claws 49 and 50 are kept in the standby state shown in FIG. 3(a).

1, for example, when the desired type on the first type wheel 13 comes close to the printing position corresponding to the platen (not shown),
The electromagnetic coil 56 is energized, thereby causing the locking pawl 49.
The body parts 7B and 79 of 50 are the side end surfaces 80 and 81 of the yoke 61.
is adsorbed to. Therefore, the locking claws 49 and 50 are as shown in FIG. 3(b).

As shown by arrow 85 in (e), the first locking pawl 49 attempts to rotate integrally with the yoke 61, but at this time, the first locking pawl 49 has its pawl portion 51 aligned with the first tooth of the first selection ratchet 25. Part 29
As shown in FIG. 3(b), the distal end of the locking pawl 49 climbs over the bent portion 76 of the spring member 66 and rotates in the direction of the arrow 85, thereby connecting the pawl portion 51 and the third 1 tooth part 2
9 is engaged.

This causes rotation of the first selection ratchet 25.

That is, the rotation of the first type wheel 13 is stopped.

On the other hand, as described above, the second locking pawl 50 has a 1/2 pitch phase shift, and as shown in FIG. 2 teeth 30
and is kept in this state.

Therefore, the second selection ratchet 26 and the second type wheel 14 continue to rotate. For example, the first type ring 13
The electromagnetic coil 56 is de-energized in synchronization with the locking of rotation, and therefore the rotational force of the rotation shaft 53 is transferred to the second locking pawl 5.
The transmission to 〇 is cut off, and the force of the spring member 66 causes this second
The locking pawl 50 returns to the standby state shown in FIG. 3(a). Therefore, regardless of the rotation of the first rotation shaft 53, this second
The locking pawl 50 and the second selection ratchet 26 do not engage with each other.

Note that when the rotation of the first selection ratchet 25 is locked by the first locking pawl 49 as described above, the rotation of the rotation shaft 11 in the direction of the arrow 82 in FIG. 2(a) continues. Then, the tip 45 of the first arm 37 of the 1g movable pawl 31 is guided by the guide portion 47 provided on the first selection ratchet 25 and moves outward as shown by the arrow 86 in FIG. 2(b), That is, the drive claw 31 is expanded against the spring force of the second arm 39, and thereby the protrusion 35 of the first arm 37 is expanded.
The engagement between the rotary shaft 11 and the notch 12 is released, and the transmission of the rotational force of the rotary shaft 11 to the first selection ratchet 25 and the first type ring 13 is cut off.

In this way, the first type wheel 13 is positioned at the printing position of the desired type. At this time, the first
The locking pawl 49 is stably held in an engaged state in which it engages with the first tooth portion 29 of the first selection ratchet '25 by the spring force of the spring member 66.

Then, the second type wheel 14 is positioned at the printing position of the desired type body in essentially the same manner as described above.

That is, when the desired type on the second type wheel 14 comes close to the printing position facing the platen (not shown), the electromagnetic coil 56 is energized, thereby causing the second locking pawl 50
As shown by the arrow 85 in FIG. 3(b), the spring member 67
The yoke 61 rotates integrally with the yoke 61 over the bent portion 77 of the yoke 61.

The pawl portion 52 and the second tooth portion 30 engage with each other, thereby locking the rotation of the second selection ratchet 26, and the drive pawl 32 is expanded in the same manner as described above to reduce the rotational force of the one-rotation shaft 11. The first rotation of the second selection ratchet 26 is locked, and the drive pawl 32 is expanded in the same manner as described above, so that the rotational force of the second selection ratchet 26 . The transmission to the second type wheel 14 is interrupted.

Further, the type bodies provided in the type wheel (7) not shown are positioned in the same manner as described above, thereby making it possible to perform the desired printing operation.

When the printing operation is completed, for example, the electromagnetic coil 56 is energized and the locking pawls 49° 50 are attracted to the yoke 61, and the rotation axis 53 is rotated by the arrow 8 in FIG. 3(b).
7 directions, for example, the lower portions 68, 69 of the distal ends of the locking pawls 49, 50 can be reversed in the spring member 6.
The locking pawl 49.50 and the selection ratchet 25.26
The engagement with is released. Further, by reversing the rotating shaft 11 in the direction of the arrow 88 in FIG. 2(b), for example, the driving claw 3
The spring force of the second arm 39 of the first arm 37, 38
The protrusions 35, 36 engage with the notches 12 of the rotating shaft 11, as shown in FIG. 2(a).

The rotational force of the rotating shaft 11 is applied to the selection ratchets 25, 26 .
.

The state is now ready for transmission to the type wheels 13 and 14. In addition, locking claws related to other sets (not shown), 11)! Exactly the same operation is performed for electrodynamics, selection ratchets, type wheels, etc.

In the embodiment configured in this way, the phase of the first tooth portion 29 of the first selection ratchet 25 and the phase of the second tooth portion 30 of the second selection ratchet 26 are set to L/ Since they are arranged so as to be shifted by 2 pitches, even if one of the six selection ratchets 25, 26 is stopped, the rotation of the other one is continued without being stopped, and the first type ring 13 It is possible to position the type font related to the second type wheel 14 and the type font related to the second type wheel 14 at a desired printing position.

Moreover, the locking operation of the rotation of these selection ratchets 25, 26 is controlled by the electromagnetic coil 56. York 61. This can be realized by one electromagnetic clutch including a rotating body 63 and one selection ratchet 25, 26 . Also, the number of drive sources for locking the rotation of the selection ratchet (not shown) can be reduced.

Also, the pawl portion 5 engages with the tooth portion 29.30 of the ratchet 25.26 to lock the rotation of the one selection ratchet 25.26.
1 and 52, the rotation of the selection ratchet 25, 26, that is, the rotation of the type wheel 13, 14, is reliably locked. It can be done.

Also, one selection ratchets 25, 26 are provided separately on the type wheels 13 and 14, and these selection ratchets 25.
Guide part 4 for rotating the drive claws 31 and 32 at 26
7, 48, the notch 12 of the rotation shaft 11 has a first surface 12a extending toward the axis O direction of the rotation shaft 11, and the first arm 37. of the drive claw 31.32. 38 protrusions 3
5.36 has a second surface 41.degree. 42 that can be adapted to the first surface 12a, and when selecting type, the first surface 12a of the notch 12 becomes the protrusion 35 as the rotary shaft 11 rotates. .36
Since the configuration is such that the second surface 41.42 of The rotating shaft 11 is almost unaffected by force.
can be transmitted to the type wheel 13.14, the spring force of the drive claws 31.32 can be suppressed to a minimum even during high-speed rotation, and therefore the rotating shaft 11
The torque for driving this rotating shaft 11 is reduced, and the motor that drives this rotating shaft 11 can be made smaller. Further, the work of attaching the drive claws 31, 32 to the type wheel 13, 14 becomes easy, and the number of assembly work can be reduced.

Further, the driving claws 31, 32 have protrusions 35, 36 that can be engaged with the notch 12 of the rotating shaft 11, and have rigid first arms 37, 38; and a second arm 39.40 which is integrally provided with 38 and has 1 elasticity,
When the drive pawl 31.32 is attached to the type wheel 13.14, the spring force generated by deflecting the second arm 39.40 is exerted at the engagement part between the shaft 23.24 and the hole 33.34. Since the drive claws 31.32 are supported, the position of the drive claws 31.32 is stabilized, and the rotational force of the one-rotation shaft 11 can be reliably transmitted to the type wheels 13°14.
．． 14 can be easily installed.

Further, since the projections 21.22 are provided on the outer periphery of the bearings 17.18 as a restriction portion for restricting the approach of the second arms 39, 40 to the bearings 17, 18, the projections 21.22 are provided on the outer periphery of the bearings 17.18. .22 allows the drive pawls 31, 32 to be deflected to have an initial setting force, so that one rotation axis 1
1, the spring force of the drive pawls 31, 32 can be set small in advance, and the manufacturing cost of these drives 31, 32 can be reduced.

Further, the configuration includes spring members 66° 67 that can hold the locking pawls 49, 50 in a state in which they are engaged with the selection ratchet 25° 26 and in a state in which they are disengaged from the selection ratchet 25° 26, and as described above, By simply applying electricity to the electromagnetic coil 56 and changing the direction of rotation of the one-rotation shaft 53, the engagement between the locking pawl 49.50 and the selection ratchet 25.26 can be released without using any cam member or the like. The structure of the mechanism for returning the locking claws 49 and 50 is simple.

〔Effect of the invention〕

Since the printer of the present invention is configured as described above, the number of drive sources provided for locking the rotation of the type wheel can be halved compared to the conventional one. The selection of each of the typefaces provided in the wheel can be carried out using one driving source, which has the effect of lowering manufacturing costs compared to conventional methods and easing constraints on one-member arrangement design. .

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the main parts of an embodiment of the printer of the present invention, and FIGS. 2(a) and 2(b) show the relationship between the rotating shaft and the drive pawl provided in the embodiment shown in FIG. FIG. 2(a) is an explanatory diagram showing the engagement relationship between the rotating shaft and the driving claw, and FIG. Explanatory diagram showing the released disengaged state, Fig. 3(a), (
b) and (c) are explanatory diagrams showing the engagement relationship between the selection ratchet, the locking pawl, and the spring member provided in the embodiment shown in FIG. 1, and FIG. Fig. 3(b) is an explanatory drawing showing the engaged state in which the locking pawl is engaged with the selection ratchet, and Fig. 3(e) is an explanatory diagram showing the waiting state before the locking pawl and the selection ratchet are engaged. FIG. 3 is an explanatory diagram showing a non-engaged state. 11...Rotating axis, 13. Old...first type wheel,
14... Second type wheel, 1'5, 16...
...Circumferential side, 25...First selection ratchet, 2
6...Second selection ratchet, 29...
・First tooth portion, 30...Second tooth portion. Figure 2 fσ Figure 3

Claims (1)

[Claims] a rotating shaft; a first type ring that is attached to the rotating shaft and has a first type body on the circumferential side; and a first type ring that rotates integrally with the first type ring and has the first type body on the circumference side. a first selection ratchet having a first tooth portion formed at a position corresponding to the rotary shaft; a second selection ratchet that rotates integrally with the second type ring and has a second tooth portion formed on the circumferential side at a position corresponding to the second type body; and a first type wheel, a first selection ratchet, a second type wheel, and a second selection ratchet such that the phase of the first tooth portion and the phase of the second tooth portion are different. A printer characterized by placing.