JPS62187056A - Type system printer - Google Patents

Abstract

PURPOSE:To suppress the number of drive sources for stopping the rotation of a type wheel to the min., by providing a magnetic coil including a selection member in a shakable manner and selectively and magnetically coupling the selection member and a drive plate to shake the selection member. CONSTITUTION:A current is supplied to an electromagnetic coil 56 when the leading end parts 51, 52 of engaging pawls 49, 50 are positioned between tooth parts 29, 30 different in a phase of selection ratchets 25, 26 corresponding to the type positions of type wheels 13, 14 to be selected and, for example, the leading end part 51 is engaged between specific tooth parts 29 to select a type and, subsequently, the supply of a current is cut off to rotate all of the other type wheels. For example, when the leading end part 52 of the engaging pawl 50 is positioned between tooth parts 30 corresponding to the type position to be selected of the selection ratchet 26, a current is again supplied to the electromagnetic coil 56 to select a desired type. Thereafter, the supply of a current is cut off and, by repeating the same operation, all of types can be selected by only one electromagnetic coil 56. Therefore, the number of high cost drive parts can be reduced and cost can be reduced.

Description

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

[Conventional technology]

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 type printer has been proposed in which the printers are installed in eight rows or the like and the rotation of each type wheel is individually controlled to perform desired printing. This printer has a selection ratchet formed in the body of each type wheel, and a locking pawl that can be locked on each of these selection ratchets, and a locking pawl that can be engaged with the selection ratchet. ,
Alternatively, a drive source such as a solenoid is provided to drive the locking pawl so that the locking pawl and the selection ratchet are disengaged.

[Problem that the invention seeks to solve]

In other words, 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, a considerably large space is required for the arrangement of parts, and the manufacturing cost is reduced. There is a problem in that as the cost increases, the design of the arrangement of parts is restricted.

The present invention has been made in view of the actual situation in the prior art, and its object is to provide a type printer that can minimize the number of drive sources provided for stopping the rotation of the type wheel. Our goal is to provide the following.

[Means for solving problems]

In order to solve the above-mentioned problems and achieve the intended purpose, the present invention provides a type printer that is equipped with a plurality of type wheels and prints by selecting the type provided on the outer periphery of the type wheels. A rotating shaft on which the type wheel is attached, and a tooth portion that rotates integrally with each type wheel and are formed in positional correspondence with the type body on the outer periphery of the type wheel, and the phase of the tooth portion is A selection ratchet formed differently by a type wheel that rotates together, a drive plate fixed to a rotating shaft, and a swing fulcrum formed at one end, with a part facing the side of the drive plate. a selection member that selectively engages the teeth of the selection ratchet through a swinging motion to select the type to be printed;
a magnetic coil that swingably includes the selection member and selectively magnetically couples the selection member and the driving plate to swing the selection member; and a magnetic coil that swingably includes the selection member; The structure includes a supporting yoke.

[Effect]

According to the above means, the selection member is driven by alternately repeating energization and de-energization of the coil with respect to the rotating type wheel, and the selection member is moved to the teeth of the selection ratchet corresponding to the desired type position. After selecting a type by sequentially locking a portion of the type and completing AtR of a series of type, a desired character arrangement can be obtained and printing can be performed. At this time, it is also possible to perform the printing selection required for printing by energizing and de-energizing only one coil.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

All of the figures are for explaining the type selection mechanism of the printer according to the embodiment of the present invention, FIG. 1 is an exploded perspective view showing the main parts of the embodiment of the printer of the present invention, and FIG. ,
(b) is an explanatory diagram showing the engagement relationship between the rotating shaft and the drive claw provided in the embodiment shown in FIG. 1, and FIG.
, (c) is an explanatory diagram showing the engagement relationship between the selection ratchet, the locking pawl, and the spring member provided in the embodiment shown in FIG.
FIG. 4 is a perspective view of the main parts of the driving part of the locking pawl.

In FIG. 1, reference numeral 11 denotes a rotating shaft, which is provided with a V-shaped notch 2 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, as shown in FIG. 2(b), the notch part 2 has a first surface 12a extending toward the axis 0 of the rotating shaft 11.
It is equipped with Reference numerals 13 and 14 indicate one type wheel (hereinafter referred to as the first type wheel) of the type wheels formed in multiple stages attached to the rotary shaft 11 and an adjacent type ring (hereinafter referred to as the second type wheel). (referred to as type wheels), each with 15 circumferential sides.
．． 16, a plurality of typefaces (hereinafter referred to as the first typeface)
and another typeface (hereinafter referred to as a second typeface), and a bearing 1 in which a rotating shaft 11 is inserted in the center.
7,18.

A cavity 19.20 is formed in a part of the bearing 17.18, and projections 21 and 22 are provided on the outer periphery of the bearing 17.18.
Shafts 23 and 24 are provided in four sections.

Further, 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 13 and 14.
, 14 (hereinafter referred to as the first selection ratchet)
(hereinafter referred to as the selection ratchet) and another selection ratchet adjacent thereto (hereinafter referred to as the second selection ratchet), each having a bearing 17, 1 of the type wheel 13, 14 in the center.
8 are inserted into the holes 27, 28, and teeth 2 are provided on the circumferential side and at positions corresponding to the type bodies of the type wheels 13 and 14, respectively.
9°30 (hereinafter, 29 will be referred to as the first tooth portion and 30 will be referred to as the second tooth portion). Further, 31 and 32 are drive claws disposed between the type wheel 13 and the selection ratchet 25 and between the type wheel 14 and the selection ratchet 26, respectively, and transmitting the rotational force of the rotary shaft 11 to the type wheels 13 and 14, respectively. It has a hole 33.34 inserted into the shaft 23.24 provided in the type wheels 13, 14 so as to be relatively rotatable therein, and a protrusion 35.36 which can be engaged with the notch 12 of the rotary shaft 11. It consists of a first arm 37.38 which has rigidity and a second arm 39.40 which has elasticity. Further, the protrusions 35 and 36 correspond to the rotation shaft 11 shown in FIG. 2(b) mentioned above.
are respectively provided with second surfaces 41 and 42 that are adaptable to the first surfaces 12a of the notches 12.

Note that the selection ratchets 25 and 26 described above are shown in FIG.
As illustrated in FIG. 1 and (b), recesses 43 and 4 into which drive claws 31 and 32 can be inserted are provided on the side facing the type wheels 13 and 14.
4 and the tip 4 of the first arm 37° 38 of the drive pawl 31.32.
5.46 is movably engaged, that is, the drive claw 3
1.32 is provided with a guide portion 47.48 for rotation about the axis 23.24. In addition, the above-mentioned bearing 17
, 18 constitute a restricting portion for restricting the second arm 39,40 of the drive pawl 31,32 from approaching the bearings 17,18.

The above-described type wheels 13, 14, drive pawls 31, 32, and 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 wheel 13. It is fitted into the first type ring 13 so as to correspond to the position of the type font.

Similarly, the bearing 18 of the second type wheel 14 is attached to the rotating shaft 11.
part is inserted, then the hole 34 of the drive pawl 32 is inserted into the shaft 24 of the second type wheel 14 and the projection 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 so as to engage with the protrusion 22 of the bearing 18 . The second selection ratchet 26 then
The respective positions of the second tooth portions 30 correspond to the second type wheel 1.
It is fitted into the second type ring 14 in a manner corresponding to the position of the second type body provided on the fourth circumference side.

In this way, a predetermined number of stages, for example, N stages of type wheels, selection ratchets, etc. are fitted one after another.

Then, the first type wheel 13, the first selection ratchet 25, the second type wheel 14, and the second selection ratchet 2 described above
6 is arranged between the first tooth portions 29 so that the phase of the first tooth portion 29 and the phase of the second tooth portion 30 are different, for example, shifted by 1/N pitch from each other, that is, in a state where the phases are shifted. The second tooth portion 30 is arranged on the rotating shaft 11 so that the second tooth portion 30 is located at a position corresponding to the second tooth portion 30 .

In addition, 49.50 shown in Figure 1 is a selection ratchet) 25
．． The first locking pawl and the second locking pawl are capable of locking the rotation of the selection ratchet 25 and 26, and have pawls 51 and 52 at their tips that engage with the teeth 29 and 30 of the selection ratchet 25 and 26. It has holes 54 and 55 into which the rotation shaft 53 is inserted.

Reference numeral 56 denotes an electromagnetic coil as a driving source, and a gap 56a is formed in the center in which iron cores 59 and 60, which will be described later, can swing.

This iron core 59,60 has a yoke 6 having a key-shaped cross section.
In the figure of 1, it is swingably attached to the lower end part, and bypass parts 59a, 60 are provided on the tip side of the iron core 59.60.
a is provided in a protruding manner at a position opposite to a protrusion 61 a formed on the yoke 61 . The protruding end 61b at one end of the yoke 61 is formed to have a width comparable to that of the tip of the iron core 59, and has a so-called comb-shaped yoke whose side surfaces are located on the same plane.

The rotating shaft 53 further includes a drive plate 63.6 made of a magnetic material.
4 is fitted, and the iron core 5 is fitted on the side of this drive plate 63,64
The side surfaces of the tip portions 59b, 60b of 9.60 and the protruding end 61b of the yoke 61 are sliding, respectively. The drive plates 63, 64 are rotated in the direction of arrow A via the rotation shaft 53 by a motor (not shown). Locking pawls 49 and 50 are loosely fitted to the rotation shaft 53 adjacent to drive plates 63 and 64, respectively, and leaf springs 66 and 67 engaged with protrusions 68 and 69 projecting from the lower end. , whose location is regulated.

Further, the locking pawls 49,50 are formed with working ends 70.degree. 71, which the tip portions 59b, 60b of the iron core 59.60 come into contact with. Then, the electromagnetic coil 56 and the yoke 61
, the iron core 59, and the drive plate 63 constitute a drive means for rotating the locking claws 49, 50, that is, an electromagnetic clutch.

Note that this embodiment is an example in which the driving member is composed of two members, the iron core 59.60 and the locking claw 49.50.
It is also possible to engage the tip of the 0 directly with the teeth 29 and 30 of the selection ratchet) 25 and 26.

This driving means is actually assembled as shown in Fig. 4, with N iron cores for N stages of type wheels, and N-1 drive plates.
A predetermined number of stages, for example 18 stages, are provided.

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
2 (al. As shown in FIG. 2, the protrusions 35 and 36 of the drive pawls 31 and 32 are engaged with the notch 12 of the rotating shaft 11, and the rotating shaft 11 is moved by, for example, a motor (not shown) as shown in FIG. In the direction of arrow 82, that is, in FIG. 3(a)
The rotating shaft 53 rotates in the direction of the arrow 83 in FIG. 3(a).
When the rotating shaft 11 rotates in the direction of the arrow 84, the first surface 12a of the notch 12 rotates as shown in FIG. 2(a).
presses the second surface 41.42 of the drive pawl 31.32, thereby transmitting a rotational force to the drive pawl 31.32, and this rotational force is further transmitted to the first arm 37.38 of the drive pawl 31.32.
The driving force is transmitted from the tip 45.46 of the selection ratchet 25.26 to the guide portion 47.48 of the selection ratchet 25.26. 14, and the type wheel 13°14 is integrally connected to the rotating shaft 11, and
Rotates in two directions. During this time, although the drive plates 63 and 64 rotate with the rotation of the rotation shaft 53, the rotational force of the rotation shaft 53 is not transmitted to the locking pawls 49 and 50, so these engagement The retaining pawls 49,50 are kept in the standby state shown in FIG. 3(a).

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 iron core 59.6
0 rotates counterclockwise in the figure, and the tip portion 59b,
60b is the operating end 70.71 of the locking claw 49.50, respectively.
comes into contact with.

Therefore, the locking claws 49,50 are as shown in FIG. 3(b).

(The first locking pawl 49 attempts to rotate clockwise as shown by the arrow 85 in C1, but at this time, the first locking pawl 49 is positioned between the first teeth 29 of the first selection ratchet 25 with its pawl 51. Therefore, as shown in FIG. is engaged, thereby locking the rotation of the first selection ratchet 25, that is, the rotation of the first type ring 13.On the other hand, the second locking pawl 50 has a 1/N rotation as described above. As the pitch phase shifts, the claw portion 52 shifts to the second position as shown in FIG. 3(C).
is brought into contact with the second tooth portion 30 of the selection ratchet 26 and is maintained in this state. Therefore the second selection ratchet 26
And the second type wheel 14 continues to rotate. For example, the electromagnetic coil 56 is
Therefore, the transmission of the rotational force of the rotating shaft 53 to the second locking pawl 50 is cut off, and the second locking pawl 50 is moved by the force of the spring 67 as shown in FIG. 3(a). ) returns to the standby state shown in ( ). Therefore, regardless of the rotation of the rotation shaft 53, the second locking pawl 50 and the second selection ratchet 26
It does not engage with.

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 drive 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). In other words, the drive claw 31 is expanded against the spring force of the second arm 39, whereby the engagement between the protrusion 35 of the first arm 37 and the notch 12 of the rotating shaft 11 is released, and the rotating shaft 1
The transmission of the rotational force of 1 to the first selection ratchet 25 and the first type wheel 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 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. The rotation of the second selection ratchet 260 is locked, and the drive pawl 32 is expanded in the same manner as described above, and the rotation of the second selection ratchet 26 due to the rotational force of the rotating shaft 11 is locked, and the drive pawl 32 is expanded as described above. The rotational force of the rotating shaft 11 is spread out in the same manner as in the above, and the transmission of the rotational force of the rotating shaft 11 to the second selection ratchet 26 and the second type ring 14 is cut off.

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

Then, when the printing operation is finished, for example, the type wheel 13
．． 14 and the selection ratchets 25, 26, the rotation shaft can be 11 is reversely rotated in the direction of arrow 88 in FIG.
Accordingly, selection ratchets 25,26 also rotate in the direction of arrow 88. By rotating this selection ratchet 25, 26,
The locking pawls 49,50 are rotated in the direction of arrow 87 in FIG. 3(b) and returned to the waiting position. The shape of the pawl portions 51, 52 of the locking pawl 49° 50 is set at an appropriate pressure angle so that the selected ratchet 25° 26 is rotated in the direction of arrow 87 in the clockwise direction. It becomes. This disengages the locking pawl 49.50 from the selection ratchet 25.26. Further, by reversing the rotating shaft 11 in the direction of the arrow 88 in FIG.
36 is engaged with the notch 12 of the rotating shaft 11, and as shown in FIG.
As shown in a), the rotational force of the rotating shaft 11 is applied to the selection ratchets 25, 26 . It becomes possible to transmit the information to the type wheels 13 and 14. It should be noted that exactly the same operation is performed for other sets of locking pawls, drive pawls, selection ratchets, type wheels, etc. not shown.

Here, the operating principle of the iron core 59,60 will be explained.

When the electromagnetic coil 56 is energized, the iron core 59.6
The magnetic flux generated at 0 is the magnetic flux that reaches the protruding end 61b from the tip portions 59b and 60b via the drive plate 63, and the magnetic flux that is generated at the bypass portion 59.
The magnetic flux is divided into two: a and the magnetic flux passing through 60a. Tip part 5
9b, 60b and the yoke 61 face the drive plate 63 with zero gap, so the permeance in this part is high, and the bypass parts 59a, 60a face the protrusion 61a of the yoke 61 with a gap in between. Therefore, the permeance in this part is small. Therefore, when the electromagnetic coil 56 is energized, the magnetic flux on the end portions 59b, 60b side of the iron core 59, 60 immediately after energization is transferred to the bypass portion 59a,
60 It becomes larger than the magnetic flux on the a side. At that time, the magnetic flux on the side of the tips 59b and 60b causes the tip 5 to
9b and 60b are attracted to the drive plate 63, and this drive plate 63
As the iron cores 59 and 60 rotate, the iron cores 59 and 60 are rotated in the direction A in FIG. When the iron cores 59 and 60 rotate, the bypass portion 59a
.

60a comes into contact with the protrusion 61a of the yoke 61, and the iron core 59
．． 60 stops rotating. And the bypass part 59a,
60a contacts the yoke 61 side, the bypass portion 59
The magnetic flux at the tips a and 60a increases, the magnetic flux at the tips 59b and 60b decreases, and the attraction force between the tips 59b and 60b and the drive plate 63 also decreases, so that the drive plate 63 continues to rotate. There is. During the rotation process of the iron core 59.60, its tips 59b, 60b come into contact with the operating end 70.71 of the locking pawl 49.50, and move clockwise in the figure against the elastic force of the spring 66.67. By rotating it, the aforementioned selection operation is possible.

When such a drive means is used, the type wheel 13 to be selected
', selection ratchet l-25 corresponding to 14 type positions,
A locking pawl 49.5 is provided between the teeth 29.30 of 26 different phases.
When the tips 51 and 52 of 0 are positioned, the electromagnetic coil 56
is energized to select a type by locking the tip portion 51 between specific teeth 29, for example, and then de-energize to rotate all other type wheels. Then, for example, the selection ratchet 26
A locking pawl 5 is inserted between the teeth 30 corresponding to the type position to be selected.
When the tip 52 of 0 is located, the electromagnetic coil 56 is turned on again.
energize to select the desired type.

Then, by turning off the power and repeating the same operation,
It is also possible to configure so that all printed characters can be selected by only one electromagnetic coil 56. Therefore, the number of expensive drive units can be reduced, and the price of the printer can be lowered.

In the above embodiment, the type ring 13, 14 and the selection ratchet 25, 26 are formed separately and are rotated integrally. Needless to say, it can also be applied to those formed integrally.

〔Effect of the invention〕

Since the printer of the present invention is constructed as described above, the number of drive sources provided for stopping the rotation of the type wheel is extremely reduced compared to the conventional one, and the minimum is only one electromagnetic coil. The drive mechanism can be formed using the following methods, which has various effects such as significantly reducing product costs, being advantageous in downsizing, and increasing the degree of freedom in 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. These are explanatory diagrams showing the relationship, and Figure 2 (al is an explanatory diagram showing a locked state in which the rotating shaft and the driving claw are engaged, and Figure 2 (bl is an explanatory diagram showing the locked state in which the rotating shaft and the driving claw are released) Explanatory diagram showing the non-consolidation state, FIG. 3 (al,
(b) and (e) 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. FIG. 3(b) is an explanatory diagram showing a locked state in which the locking button is engaged with the selection ratchet, and FIG. FIG. 4 is a partially cross-sectional perspective view showing the main parts of the drive unit. 11...Rotating shaft, 13.14...・Type ring, 25゜26... Teeth, 29.30...
... Teeth, 49.50 ... Locking claw, 53 ...
...Rotation axis, 56...Magnetic coil, 59.6
0...Iron core, 61...Yoke, 63°64...Drive plate. Hanawa / Figure 2 tσ Figure 3 tσ Figure 4 :)6

Claims (1)

[Scope of Claims] A plurality of type wheels having type bodies on the outer periphery, a rotating shaft on which the type wheels are attached, and a rotating shaft that rotates integrally with each type ring and has type bodies on the outer periphery of the type wheels. a selection ratchet comprising teeth formed in positional correspondence with the type wheel, the teeth having different phases depending on the type wheel which rotates together with the selection ratchet; and a drive fixed to the rotating shaft. A swinging fulcrum is formed at one end of the plate, and a portion thereof faces the side surface of the drive plate, and selectively engages the teeth of the selection ratchet by swinging motion to select the type to be printed. a selection member; a magnetic coil that swingably includes the selection member and selectively magnetically couples the selection member and the drive plate to swing the selection member; and a magnetic coil that swings the selection member; A type printer characterized by comprising: a yoke that is swingably supported;