JPH0420058Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a printer, and more particularly to an improvement in a locking pawl drive mechanism that locks the rotation of a type wheel.

[Conventional technology]

Conventionally, multiple rows, for example, 18 rows of type wheels with type engraved on their circumferential surfaces are attached to a rotating shaft placed parallel to the platen around which the recording paper is wound, and each type wheel is rotated. There are known printers that perform desired printing by individually controlling the printers.
Conventionally, as a type wheel control mechanism for this type of printer, a selection ratchet is integrally attached to the side surface of each type wheel, and locking pawls equipped with electromagnetic clutches are arranged at positions facing the teeth of these selection ratchets. A device has been proposed in which each locking pawl and its corresponding selection ratchet are appropriately engaged or disengaged by installing an electromagnetic clutch and operating an electromagnetic clutch.

However, since the above-mentioned printer has a structure in which an electromagnetic clutch is provided for each locking pawl, there are drawbacks such as a large number of parts, high manufacturing costs, and an increase in the size of the device.

In order to eliminate the above-mentioned drawbacks of the prior art, the applicant of the present application previously proposed a type wheel control mechanism shown in FIG. 5 (Utility Application No. 60-003619).

As shown in FIG. 5, this printer mainly consists of a first rotary shaft 1, a type wheel 2, 2a attached to the first rotary shaft 1, and each type wheel 2, 2a integrally connected to the first rotary shaft 1. Rotating selection latches 3, 3a, a second rotating shaft 4, rotatably attached to the second rotating shaft 4, and arranged in a position where it can freely engage and disengage from the teeth of the selection latches 3, 3a. an electromagnetic clutch 6 that appropriately transmits the driving force of the second rotating shaft to the two locking pawls 5, 5a, and a locking pawl 5, 5a connected to the selection ratchet 3. , 3a.
It is composed of.

The tooth portions of the selection latches 3, 3a are set to be shifted by half a pitch from each other in the circumferential direction of the first rotating shaft 1, and the locking pawls 5, 5a are set on either of the selection latches 3, 3a. It is adapted to selectively engage the teeth.

The electromagnetic clutch 6 includes an electromagnetic coil 8, a ring-shaped yoke 9 made of a magnetic material having a notch 9a on one side, and a rotating body 10 made of a non-magnetic material fitted into the notch 9a of the yoke 9. Consists of. Electromagnetic coil 8
is fixed to a chassis (not shown), and the yoke 9
is rotatably attached around the winding portion 8a of the electromagnetic coil 8. Further, the rotating body 10 is fixed to the second rotating shaft 4, and the yoke 9 is fixed to the second rotating shaft 4.
It is fitted into a notch 9a formed in the. That is, the yoke 9 is designed to constantly rotate around the winding portion 8a of the electromagnetic coil 8 as the second rotating shaft 4 rotates.

In the above printer, when the electromagnetic coil 8 is excited, the locking claws 5, 5a are attracted to both sides of the yoke 9, and the locking claws 5, 5a are rotated in the direction of rotation of the yoke 9, that is, the second rotating shaft 4. Rotated. Of these locking pawls 5, 5a, one of the locking pawls is engaged with the corresponding one of the selection ratchets, and the set position of the teeth is shifted by half a pitch from the other selection ratchet. Regarding the other locking pawl corresponding to the selection ratchet, the other locking pawl and the selection ratchet do not engage with each other because the locking pawl abuts the tip of the teeth of the selection ratchet. This selectively locks the selection latches 3, 3a, that is, the type wheels 2, 2a.

The above-mentioned locking pawl drive mechanism uses one electromagnetic coil 8 to drive the two locking pawls 5, 5a, so compared to conventional printers in which one electromagnetic coil is set for each locking pawl. The structure is much simpler,
In addition, it has an excellent feature that manufacturing costs can be reduced by the reduction in the number of parts.

[Problem that the invention seeks to solve]

However, in the above printer, the electromagnetic coil 8
Since a ring-shaped yoke 9 is rotatably disposed around the winding part 8a of the electromagnetic coil 8, the winding part 8a of the electromagnetic coil 8
In order to prevent interference between the lead wire drawn out to the terminal section from the yoke 9 and breakage of the lead wire, a lead wire is provided on the surface of the holding base 8b that contacts the yoke 9 (surface A in FIG. 5). Since the wire cannot be wired, the lead wire pulled out from the winding part 8a is passed through the notch 8e formed in the winding part 8a to the surface of the holding base 8b on the locking claw 5a side (the surface on the locking claw 5a side). Detour wiring must be done on plane B) in Figure 5. Moreover,
In order to prevent interference with an adjacent yoke (not shown) disposed on the locking claw 5a side of the holding base 8b, a groove 8c is formed in the holding base 8b following the notch 8e, as shown in FIG. The lead wire 8d must be buried in the groove 8c. For this reason, it has been discovered that the wiring work of the lead wire 8d is difficult and productivity is low, and the manufacturing cost of the electromagnetic coil and thus the printer is increased accordingly.

Further, the electromagnetic clutch 6 has a yoke 9 in order to transmit the rotation of the rotating shaft 4 to the locking claws 5, 5a.
and a rotating body 10, and in order to rotate the yoke 9 and the rotating body 10 together, the yoke 9 is required.
and a notch 9a in the rotating body 10.
It is necessary to form a protrusion that can be fitted into the printer, which increases the number of parts and the number of processed parts, which increases the manufacturing cost of the printer.

[Means for solving problems]

The present invention provides a printer that has a simple structure and can be manufactured at low cost without sacrificing the advantages of the printer previously proposed by the applicant. When the electromagnetic coil is loosely fitted into a holding shaft arranged parallel to the shaft, and the electromagnetic coil is excited in a second rotating shaft arranged parallel to the first rotating shaft and the holding shaft, the second rotating shaft The present invention is characterized in that a rotary plate for transmitting the driving force to the locking pawl is fixed, and a yoke for rotationally driving around the winding portion is omitted.

[Effect]

In the printer of the present invention, since a rotating yoke is not disposed around the winding portion of the electromagnetic coil, the lead wire can be drawn out in any direction in the radial direction of the winding portion. Moreover, when the electromagnetic coil is energized, the two locking claws come into contact with both the left and right sides of the winding section, so if the lead wire is routed so that it does not protrude from both sides of the winding section, it can be buried in the groove. The lead wires will not be disconnected by these members without taking special measures such as doing so.

〔Example〕

Hereinafter, the printer of the present invention will be explained based on FIGS. 1 and 4. Fig. 1 is an exploded perspective view showing the main parts of an embodiment of the printer of the present invention, Fig. 2 is a sectional view of an electromagnetic coil, and Figs. 3 a and b are provided in the embodiment shown in Fig. 1. An explanatory diagram showing the engagement relationship between the first rotating shaft and the drive pawl, FIGS. 4a, b, and c are
FIG. 6 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 the figure.

In FIG. 1, reference numeral 11 denotes a first rotating shaft, which has a V-shaped notch 12 on its circumferential surface along the axial direction, and a recording paper (not shown) is wound around this first rotating shaft 11. parallel to the platen.
The notch 12 has a first surface 12a extending toward the axis O of the first rotating shaft 11, as shown in FIG. 3b. Reference numerals 13 and 14 denote a first type ring and a second type ring attached to the first rotating shaft 11, and a plurality of first type bodies and a plurality of second type bodies are provided on the peripheral surfaces 15 and 16, respectively. bearings 17 and 1, into which the first rotating shaft 11 is inserted.
It has 8. Some of the bearings 17 and 18 are empty.
Further, projections 21, 22 are provided on the outer peripheries of the bearings 17, 18, and shafts 23, 24 are provided at intermediate portions between the bearings 17, 18 and the type wheels 13, 14. .

Further, 25 and 26 are provided separately from the type wheels 13 and 14, and a first selection ratchet and a second selection ratchet are fitted onto these type wheels 13 and 14 and rotate integrally with the type wheels 13 and 14. With the selection ratchet, holes 27 and 28 are opened in the center, into which the bearings 17 and 18 of the type wheels 13 and 14 are inserted, respectively, and holes 27 and 28 are formed on the periphery at positions corresponding to the type bodies formed in the type wheels 13 and 14. A first tooth portion 29 and a second tooth portion 30 are formed in relation to each other.

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 holes 33, 34 which are inserted into the shafts 23, 24 provided in the type wheels 13, 14 so as to be relatively rotatable therein, and projections 35, 36 which can be engaged with the notch part 12 of the rotary shaft 11. and has rigidity.
arms 37, 38, and a second elastic arm 39,
It consists of 40. Moreover, the protrusions 35 and 36 are
Notch 12 of rotating shaft 11 shown in FIG. 3b mentioned above
The second surface 41, 4 which can be adapted to the first surface 12a of
2 each.

Incidentally, the selection ratchets 25 and 26 described above are connected to the type wheels 13 and 14, as illustrated in FIGS. 3a and 3b.
recesses 43 and 44 into which the drive claws 31 and 32 can be inserted, and first arms 3 of the drive claws 31 and 32
The parts where the tips 45 and 46 of 7 and 38 movably engage, that is, the drive claws 31 and 32, are connected to the shafts 23 and 24.
Guide portions 47 and 48 are provided for rotation around the center. Further, the projections 21 and 22 of the bearings 17 and 18 described above are connected to the second arms 3 of the drive claws 31 and 32.
9 and 40 from approaching the bearings 17 and 18.

The above-mentioned type wheels 13, 14, drive claws 31, 3
2. The selection latches 25 and 26 are attached to the rotating shaft 11 in the following manner. That is, the bearing 17 portion of the first type wheel 13 is inserted into the rotating shaft 11, and then the hole 33 of the drive pawl 31 is inserted into the shaft 2 of the first type wheel 13.
3, and the protrusion 35 of the first arm 37 is inserted into the bearing 1.
7 into the hollow part 19, and then this protrusion 3
5 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. The hole 27 of the first selection ratchet 25 is then inserted into the rotary shaft 11, and this first selection ratchet 25 has its first teeth 29
The first type wheel 13 is arranged so that
will be installed on the

Similarly, the bearing 18 portion of the second type wheel 14 is inserted into the rotating shaft 11, and then the hole 34 of the drive pawl 32 is inserted into the shaft 24 of the second type wheel 14.
The protrusion 36 of the first arm 38 is connected to the hollow part 20 of the bearing 18.
, and then this protrusion 36 is inserted into the rotating shaft 11
is engaged with the notch 12 of. In addition, the second arm 40
is mounted so as to engage with the protrusion 22 of the bearing 18. The second selection ratchet 26 then selects the second type in such a way that the position of each of its second teeth 30 corresponds to the position of the second type body provided on the circumferential side of the second type wheel 14. It is fitted into the type ring 14.

The above-described first type wheel 13, first selection ratchet 25, second type wheel 14, and second selection ratchet 26 are connected to the phase of the first toothed portion 29 and the phase of the second toothed portion 30. For example, the second teeth 30 are arranged on the rotating shaft 11 such that the second teeth 30 are located at a half-pitch from each other, that is, at positions corresponding to the spaces between the first teeth 29.

Further, reference numerals 49 and 50 shown in FIG.
Bearings 54 and 5 have claws 51 and 52 at their tips that fit into the teeth 29 and 30 of the bearings 54 and 5 through which the holding shaft 53 passes.
5 approximately in the center. The holding shaft 53 is disposed parallel to the first rotating shaft 11 and is rotationally driven in the direction of arrow A. The above locking claws 49, 50
are rotatably attached to this holding shaft 53, and the frictional force acting between these locking claws 49, 50 and the holding shaft 53 always keeps the claws 51, 5
2 is biased toward the selection latches 25 and 26.

56 is an electromagnetic coil, which includes a winding part 56a, a holding stand 56b, and these winding part 56a and holding stand 56b.
The winding portion 56a has a through hole 57 that passes through the holding shaft 53 in the center of the winding portion 56a. Holding stand 56b and connecting part 5
As shown in FIG.
The lead wire 58a of the winding 58 wound around 6a is
It is pulled out along the inner surface side of this holding stand 56b,
It is electrically connected to a connecting terminal 59 formed protrudingly from the lower end of the holding base 56b. This electromagnetic coil 56
is attached by fixing the holding base 56b on a chassis (not shown), and the winding portion 5
The holding shaft 53 passes through a through hole 57 formed in the center of the winding portion 56a, and the two locking claws 49 and 50 are provided on both sides of the winding portion 56a.

Note that a notch 60, which is slightly larger than the connecting portion 56c of the electromagnetic coil 56, is formed at the lower part of the locking pawls 49, 50 in order to avoid interference with the connecting portion 56c of the electromagnetic coil 56.

61 and 62 indicate the state in which the locking claws 49 and 50 are engaged with the selection latches 25 and 26, and the state in which the latches 2 are engaged with the selection latches 25 and 26;
upper portions 67, 68 that can be engaged with lower portions 63, 64 and upper portions 65, 66 of the distal ends of locking claws 49, 50, respectively; Lower part 69,7
0, respectively.

73 is a second rotating shaft, which is arranged parallel to the first rotating shaft 11 and the holding shaft 53,
It is rotationally driven in the opposite direction to the holding shaft 53 (the direction of arrow B in FIG. 1). The rotation shaft 73 has the locking pawl 4 when the electromagnetic coil 56 is excited.
9 abutting portion 49a and abutting portion 5 of the locking claw 50
A rotary plate 74 made of a magnetic material is integrally provided so that the rotary plate 74 is in contact with both the front and back surfaces of the outer periphery.

Although not shown in the drawings, the two type wheels 13, 14, selection latches 25, 26, drive claws 31, 32, and two locking claws 49, 5 as described above are included.
0, spring members 66, 67, one electromagnetic coil 5
6. A plurality of sets, for example nine sets, of one rotating plate 74 are arranged along the axial direction of each of the first rotating shaft 11, the holding shaft 53, and the second rotating shaft 73.

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

That is, as shown in FIG. 4a, the locking claws 49, 5
Spring members 6 are attached to the upper portions 65, 66 of the distal ends of
The lower part 69 of the bent portion 71, 72 of 1, 62,
70 is engaged, and in addition, as shown in FIG. When the first rotating shaft 11 is rotated in the direction of the arrow 82 in FIG. 3a by a motor (not shown), the rotation of the first rotating shaft 11 causes a cut as shown in FIG. 3a. The first surface 12a of the notch 12 is the second surface 41, 42 of the driving claws 31, 32.
By pressing , rotational force is transmitted to the drive claws 31 and 32, and this rotational force is further transmitted to the drive claws 31 and 32.
The guide portions 47, 48 of the ratchets 25, 26 are selected from the tips 45, 46 of the first arms 37, 38 of 32.
This results in selection ratchet 25,
26 is rotated in the direction of arrow 82. Also, the first
The rotational force of the rotating shaft 11 of the drive claws 31 and 32 is
3 and 34 to the shafts 23 and 24 of the type wheels 13 and 14, and the type wheels 13 and 14 rotate integrally with the rotating shaft 11 in the direction of the arrow 82. During this time, as the holding shaft 53 rotates, a frictional force acts on the locking pawls 49 and 50 in the direction of arrow A, but this frictional force is smaller than the holding force of the spring members 61 and 62, so this As a result, the locking claws 49, 50 do not rotate, and these locking claws 49, 50 are maintained in the standby state shown in FIG. 4a.

For example, when a desired type body on the first type wheel 13 comes close to a printing position corresponding to a platen (not shown), the electromagnetic coil 56 is energized, thereby causing the central cylindrical portions of the locking pawls 49, 50 to 54,5
5 is attracted to the holding shaft 53, and contact portions 49a, 50a of the locking claws 49, 50 are attracted to both the front and back sides of the rotary plate 74. As a result, the contact portions 49a, 50a of the locking claws 49, 50 receive the rotational force of the rotary plate 74 and rotate in the direction of the arrow 84 in FIG. 51 and 52 are shown in Fig. 4 b and c.
As shown by the arrow 85, the selection ratchet 25,
Trying to turn to the 26 side.

At this time, one of the locking pawls 49 and 50, for example, the first locking pawl 49, has its pawl portion 51 connected to the first tooth portion 2 of the first selection ratchet 25.
As shown in FIG.
6 and rotate in the direction of the same arrow 85, and the claw part 5
1 and the first toothing 29, thereby locking the rotation of the first selection ratchet 25, and thus the rotation of the first type wheel 13. On the other hand, as described above, the second locking pawl 50 has the teeth 30 of the second selection ratchet 26 connected to the first selection ratchet 25.
Since the phase is set to be shifted by half a pitch from the tooth portion 29 of the claw portion 52 as shown in FIG.
abuts against the outer surface of the second teeth 30 of the second selection ratchet 26 and remains in this state. Therefore, the second selection ratchet 26 and the second type wheel 14
continues to rotate. Also, for example, the first type ring 13
The transmission to the electromagnetic coil 56 is cut off in synchronization with the locking of rotation, and the force of the spring member 62 causes the second locking pawl 50 to return to the standby state shown in FIG. 4a. Therefore, regardless of the rotation of the rotation shaft 53, the second 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 rotating shaft 11 in the direction of the arrow 82 in FIG. Then, the first drive claw 31
The tip 45 of the arm 37 is the first selection ratchet 25.
It is guided by a guide portion 47 provided at the center and moves outward as shown by an arrow 86 in FIG. 3b. first arm 3
7 is expanded against the spring force of the second arm 39, the engagement between the protrusion 35 of the first arm 37 and the notch 12 of the rotating shaft 11 is released, and the rotational force of the rotating shaft 11 is released. The transmission 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.
Note that at this time, the first locking claw 49 is attached to the spring member 66.
The first selection ratchet 25 is pressed against the first teeth 29 side by the spring force, and the engagement state between the first locking pawl 49 and the first selection ratchet 25 is stably maintained. Ru.

Then, in almost the same manner as described above, the second type wheel 14 is positioned at the printing position of the desired type. 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.
As a result, the second locking pawl 50 engages the bent portion 72 of the spring member 67 as shown by the arrow 85 in FIG. 4b.
The claw portion 52 and the second tooth portion 30
are engaged, thereby locking the rotation of the second selection ratchet 26, and the driving pawls 32 are expanded in the same manner as described above, so that the rotational force of the rotating shaft 11 is
The transmission to the selection ratchet 26 and the second type wheel 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.

When the printing operation is completed, for example, the electromagnetic coil 56 is energized and the locking claw 4 is attached to the rotating plate 74.
9, 50 are attracted and the rotating shaft 53 is reversed in the direction of the arrow 87 in FIG.
64 is the bent portion 71, 72 of the spring members 61, 62
The locking claw 4 rotates so that it can be climbed over.
9, 50 and the selection latches 25, 26 are disengaged. In addition, the rotation axis 11 is indicated by the arrow 88 in FIG. 3b.
By reversing the direction, for example, the drive claw 31
The spring force of the second arm 39 causes the first arm 37,
The protrusions 35 and 36 of 38 form the notch 1 of the rotating shaft 11.
2, as shown in FIG. 3a, the rotating shaft 11
The rotational force of the selected ratchets 25, 26, type wheel 1
3 and 14 becomes possible.

In addition, the locking claws, drive claws, and
Exactly the same operation is performed for selection ratchets, type wheels, etc.

The printer of the above embodiment is arranged so that the phase of the first teeth 29 of the first selection ratchet 25 and the phase of the second teeth 30 of the second selection ratchet 26 are shifted by half a pitch. Therefore, even if the rotation of one of the selection latches 25 and 26 is stopped, the rotation of the other one is not stopped and the rotation is continued, and the type body related to the first type wheel 13 and the second type type body are
The type body associated with the type ring 14 can be positioned at a desired printing position, and the rotation of these selection latches 25 and 26 can be locked by the electromagnetic coil 56. , 26, and the number of electromagnetic coils that lock the rotation of the selection ratchet (not shown) can be made half the number of locking pawls. In addition, the second rotating shaft 7
3 is transmitted through the rotating plate 74, there is no need to provide a ring-shaped yoke around the outer periphery of the winding portion 56a of the electromagnetic coil 56, and it is extremely easy to draw out the lead wire 58a. be converted into
Furthermore, a holding shaft 53 that holds the locking claws 49 and 50
, select the claws 51 and 52, and select the ratchets 25 and 26.
Since the locking claws 49 and 50 are rotated in the direction of biasing the side, when the electromagnetic coil 56 is excited, the locking claws 49 and 50 absorb the driving force (attractive force) of the rotating plate 74, the holding shaft 53, and the locking claws 49 and 50. The locking claws 49,
The rotation operation of 50 is performed smoothly and quickly.

[Effect of idea]

As explained above, in the printer of the present invention, the second rotating shaft is set parallel to the holding shaft for holding the electromagnetic coil and the locking claw, and the driving force of this second rotating shaft is applied to the rotating plate. Since the power is transmitted to the locking pawl via the locking pawl, there is no need to provide a yoke on the outer periphery of the winding portion of the electromagnetic coil for transmitting the power of the rotating shaft to the locking pawl. Therefore, the yoke does not interfere with the lead wires, making it extremely easy to draw out the lead wires, and reducing the manufacturing cost of the printer.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing essential parts of an embodiment of the printer according to the present invention, FIG. 2 is a sectional view of an electromagnetic coil, and FIGS. FIG. 3A is an explanatory diagram showing the engagement relationship between the first rotation shaft and the drive pawl, of which FIG. FIGS. 4a, b, and c are explanatory diagrams showing a state in which the engagement between the rotating shaft of FIG. 1 and the drive pawl is released, and FIGS. FIG. 4A is an explanatory diagram showing the mating relationship, of which FIG. 4A is an explanatory diagram showing a standby state before the locking pawl is driven, and FIG. 4B is a diagram showing the state in which the locking pawl is engaged with the selection ratchet. An explanatory diagram showing, Fig. 4c
is an explanatory diagram showing a disengaged state in which the locking pawl and the selection ratchet are not engaged, FIG. 5 is an exploded perspective view of the main parts of the printer proposed earlier by the applicant, and FIG. FIG. 2 is a front view of an electromagnetic coil illustrating a problem with the printer. DESCRIPTION OF SYMBOLS 11... First rotating shaft, 13... First type wheel, 14... Second type wheel, 15, 16... Type forming surface, 25... First selection ratchet, 26...
...Second selection ratchet, 29...First tooth portion,
30...Second tooth portion, 49...First locking claw, 5
0...Second locking claw, 53...Holding shaft, 56...
electromagnetic coil.

Claims (1)

[Scope of utility model registration request] a first rotation axis arranged parallel to the platen;
A plurality of type wheels are connected to the first rotary shaft, a selection ratchet is provided to each of these type wheels and rotates integrally with each type wheel, and a selection ratchet is capable of locking the selection ratchet. a locking pawl; a second rotating shaft for rotating the locking pawl toward the selection ratchet;
In a printer equipped with an electromagnetic coil that appropriately transmits the driving force of the second rotating shaft to the locking pawl,
A holding shaft disposed parallel to the first rotating shaft passes through the central through hole of the electromagnetic coil, and the locking claws are loosely fitted to both sides of the electromagnetic coil on the holding shaft, and the second A printer characterized in that a rotating shaft is provided with a rotating plate for transmitting the driving force of the second rotating shaft to the two locking claws in accordance with the excitation of the electromagnetic coil.