JPS593158B2 - typewriter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 10 The present invention relates to a typewriter, particularly a single type head having a large number of type characters arranged on a spherical outer circumferential surface in a horizontal row direction and a vertical column direction, by rotating and tilting the typewriter to a predetermined position. No. 15 relates to an improvement in a typewriter that selects one type of type and executes a printing operation using that type.

Regarding this type of typewriter, there are already Utility Application No. 53-110729 and Japanese Patent Application No. 54-96303 filed by the same applicant as the present application. is driven to the operating position by the actuating plate, so that one rotating amount connecting member provided with half the number of print rows of the type head and one tilting amount connecting member provided with the same number as the number of print rows of the type head are selected, respectively. A device configured to execute a predetermined printing operation! 5, and an interposer is provided corresponding to each key lever.

The present invention has further improved this configuration, significantly reducing the number of interposers that were conventionally provided in the same number as key levers, reducing the number of parts, and reducing assembly, maintenance, and maintenance.
The purpose is to provide a typewriter that is easy to inspect and is highly reliable.

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in the drawings. In the drawings, FIG. 1 is a perspective view showing the overall structure of a typewriter 55 according to the present invention, FIG. 2 is a sectional view showing the keyboard portion in detail, and FIG. 3 is a partial plan view of the keyboard portion. FIG. 4 is a perspective view of the driving portion of the evening overwriter.

In the drawing, 1 is a carriage (not shown) that is movable left and right at the rear of the main body frame (not shown).
A platen 2 mounted on the platen 1 is a type head supported via a support shaft 3 at a position in front of the platen 1, and a large number of type characters are arranged on its spherical outer circumferential surface in a plurality of rows in the vertical direction at equal intervals. A plurality of rows are arranged in the horizontal direction, and when rotated together with the support shaft 3, a predetermined row of characters faces the platen 1, and when the tilting lever 4 is rotated, a predetermined row of characters is tilted by a predetermined amount. When the printed characters are moved to a print preparation position facing the platen 1 and the support shaft 3 is urged toward the platen 1, printing is performed using the selected single printed character.

Reference numeral 5 denotes a key lever rotatably supported by a support shaft 6 at the front part of the main body frame.A key button 7 is attached to the upper part of the key lever 5, and two pressing protrusions 5a and 5b are formed at the lower part. Furthermore, by bringing the hook part 5c into contact with the leaf spring 8, it is constantly biased in the counterclockwise direction in FIG. Retained.

Reference numeral 10 designates a first operation plate formed of a thin elastic plate in the shape of a comb so as to correspond to the first pressing protrusion 5a of each key lever 5, the base of which is fixed to the main body frame, and each free end of which is fixed to the body frame. First operator 10 bent downward
a, and furthermore, a through hole 10 penetrated by the second pressing protrusion 5b of the key lever 5 is provided at a position opposite to the second pressing protrusion 5b.
b is formed.

Reference numeral 11 denotes a second operation plate formed of a thin elastic plate in a comb-like shape similar to the first operation plate 10, and the main body is arranged so that each comb-like part corresponds to the second pressing protrusion 5b of each key lever 5. A second operator 11a is fixed to the frame and has each free end bent downward.

Reference numeral 12 is common to each of the first operating elements 10a corresponding to a plurality of (four in this embodiment as shown in FIG. 3) key levers 5 corresponding to the type characters arranged in the same column on the type head 2. The rotary selection levers are rotatably supported by a support shaft 13, and their total number is half of the total number of character rows on the type head 2.

(As is well known, this is because the type in the upper case and the type in the lower case are arranged 180 degrees apart from each other, and the entire type head 2 can be rotated horizontally by 180 degrees by operating the shift key. ) 14 is a tilting selection lever disposed so as to commonly correspond to each second operator 11a corresponding to a plurality of key levers 5 corresponding to letters arranged in the same line on the type head 2; It is rotatably supported by the support shaft 13, the total number of which is 3.
It is individual. (As is well known, this is because one of the four lines of printed characters is always in the print preparation position.) For both selection levers 12 and 14, the second
Although only the rotary selection lever 12 is shown in the figure, a leaf spring 15 is provided which comes into contact with the protrusion 12a of the lever and always biases the rotary selection lever 12 in the counterclockwise direction in the figure.
An L-shaped stopper 16 is provided for holding the selection lever 12 in the original position shown in the figure against the pressure.
It also has the effect of preventing the tilting selection lever 1 from deflecting in the clockwise direction in the figure.
4 is similarly applied.

Reference numeral 17 denotes a first interposer provided one each corresponding to each rotation selection lever 12, and the support shaft 1 is loosely fitted into two elongated holes 17a and 17b provided in the center.
3 and a support shaft 18 so as to be rotatable and movable back and forth, and the bent tip abutment part 12b of the rotary selection lever 12 abuts on the lower edge, and a protrusion on the lower edge A return spring 19 is attached to 17c, and a hook-shaped portion 17d is formed at the front end of the upper portion to cooperate with the ball 20 to configure a known double push prohibition mechanism. A latching protrusion 17e facing the latching plate 21 is provided, and the rear end is a first actuating member 22, which will be described later.
A bent portion 17f for abutting is provided, and a driven protrusion 17g is further formed at the rearmost end.

When the corresponding rotation selection lever 12 rotates in accordance with the operation of the key lever 5, the first interposer 17 is pressed upward by its tip contact portion 12b, and rotates about the support shaft 18 as a fulcrum. , the driven protrusion 17g is the first
The clutch release rod 24 is moved to a position where it can be engaged with the drive member 23 of the clutch release rod 24, and its front lower edge is operated to press the clutch release rod 24. Reference numeral 25 denotes a second interposer, which is provided one each corresponding to each tilting selection lever 14, and has the same structure as the first interposer 17, and its elongated holes 25a, 25b are connected to the support shafts 13, 18. It is supported, and its lower end abuts against the bent tip abutting portion 14b of the tilt selection lever 14, a return spring 26 is attached to the protrusion 25c of the lower end, and its upper front end cooperates with a ball 27. A hook-shaped portion 25d is formed, and the same applies to the latching protrusion 25e facing the latching plate 21, the bent portion 25f contacting the second actuating member 28, and the driven protrusion 25g corresponding to the second driving member 29. is formed.

The first and second driving members 23 and 29 are both fixed to a main rotating shaft 39, which will be described later, and each of the hook-shaped portions 17g and 25 of the corresponding first and second interposers 17 and 25, respectively.
It has first cam surfaces 23a and 29a, respectively, which can be engaged with the interposers 17 and 25 in the direction of the platen 1 in the figure.

The first and second interposers 17 and 25 driven by the first and second driving members 23 and 29 are placed in the operating position by having their latching protrusions 17e and 25e latched to the latching plate 21, respectively. The first and second operating members 22 and 28 corresponding to each other are connected to the bent portions 17f of the operating members 22 and 28, respectively.
, 25f to the operating position. The first and second actuating members 22 and 28 are supported by support shafts 30 that are loosely fitted into elongated holes 22a and 28a, respectively, and are urged toward the original position by springs 31 and 32, and their upper tips are connected to the cam member 3.
3, 34, and is designed to be swung as the respective cam members 33, 34 rotate, and when moved to the operating position according to each interposer 17, 25, its The curved portion tips 22b and 28b are brought to a position where they can come into contact with the first and second unselected cam followers 35 and 36, respectively.

Both the first and second cam followers 35 and 36 are connected to the support shaft 3
0, and all rotary selection levers 1
It is commonly provided corresponding to the first interposer 17 and the tilting selection lever 14 corresponding to the first interposer 17 and the tilting selection lever 14, and when each operating member 22, 28 is brought to the operating position, the shape of the corresponding cam member 33, 34 is changed. the actuating member 22, thus determined;
28, and pull or return the partially attached rotation amount selection string 37 and tilting amount selection string 38 by a near amount, respectively, to rotate the support shaft 3 and rotate the tilting lever 4. . In the above configuration, 23b and 29b are second cam surfaces continuous to the first cam surfaces 23a and 29a, respectively, and when any interposer 17, 25 is latched, a new interposer 17, 25 is attached. These driving members 23 and 29 are used to prevent rotation of the cam members 33 and 29.
34, one for each interposer 17, 25, and the rotation amount selection side and the tilting amount selection side are independent respectively, and each drive member 23, 29 and cam member 33, 34 are integrally molded. It has become a common thing. 4
0 is a first release cam fixed on the main rotation shaft 39, and a connecting rod 41 rotatably supported on the support shaft 30.
42 is a second release cam fixed to the main rotating shaft 39, and the supporting shaft Rotating lever 44 rotatably supported by 43
The interposers 1, 7, 25 are rotated, and the release rods 45, 46, which are attached to the tip of the rotation lever 44 and are provided facing the first and second operation plates 10, 11, are swung. After being latched to the latching plate 21, each of the operating elements 10a and 11a is moved approximately parallel to the right in FIG. .

Next, referring to FIG. 4, the rotation of the main rotating shaft 39 will be explained. Reference numeral 50 denotes a drive shaft that is rotatably supported approximately in the center of the main body frame, and is connected to a drive motor (not shown) and is always It is rotated in the direction. 51 is the drive shaft 5
A cylindrical clutch member 52 having two clutch pawls 52a on the outer periphery is fixed to one side of the drive gear.

The clutch member 52 has a coil spring wound around the drive shaft 50 inside, and when the rotation is restrained, only the rotation of the drive shaft 50 is allowed, and when the restraint is released, the clutch member 52 rotates together with the drive shaft 50 and connects the drive gear. 51 in the direction of the arrow in the figure. A clutch control lever 53 is rotatably supported by a support shaft 54 in the vicinity of the clutch member 52. An engagement piece 53a that can engage and disengage from the clutch pawl 52a is formed at the upper end of the lever, and a cam follower 55 rotates. A retaining piece 53b is formed at the lower end, and an engaging piece 53a is supported by a spring group to engage the clutch pawl portion 52a.
is biased in the direction of separation from the

Reference numeral 57 denotes a holding lever rotatably supported by a support shaft 58, which is normally biased by a spring 59 and is used to lock the latch portion 57a to the holding piece 53b of the clutch control lever 53 to restrain the clutch member 52. When the clutch actuating lever 61 connected to the connecting rod 60 rotates in the direction of the arrow in the figure, the clutch release rod 24 presses against the interposer 17 or 25 based on the operation of the key lever 5 against the spring 49. When the constraint is released, the constraint action is released.

The main rotating shaft 39 is arranged parallel to such a group of drive shafts and is rotatably supported, and the drive shaft 5 is engaged with a drive gear 51.
A driven gear 62 that transmits zero rotation to the main rotation shaft 39 is fixed, and a return cam 63 is fixed near it, and this return cam 63 performs clutch control as the main rotation shaft 39 rotates. The clutch control lever 53 is engaged with the cam follower 55 on the lever 53, and the clutch control lever 53 is returned to a position where it can be engaged with the clutch pawl 52a of the clutch member 52, so that the clutch member 52, which has been in the coupled state, is brought into the open state. Therefore, the clutch member 52 rotates only half a rotation and is restrained from further rotation, and the main rotating shaft 39 rotates once during that period. 64
is a printing cam fixed to the main rotating shaft 39, which is connected to the type head support 67 via an operating lever 66 pivotally supported on the shaft 65.
The type head 2 is rotated around the shaft 68, and the type head 2 is attached to the platen 1.
It hits you in the face.

The series of operations from the operation of the key lever 5 of the typewriter configured as above to the printing operation by the type head 2 will be explained according to the timing chart shown in FIG. 7 is pressed and the key lever 5 is rotated in the direction of the arrow in FIG. 1
4 is rotated in the direction of the arrow in FIG. Therefore, the corresponding first and second interposers 17, 25
are lifted by the abutting ends of the selection levers 12 and 14, respectively, and rotated counterclockwise in FIG. Rotate. When each of the first and second interposers 17, 25 rotates, the other interposers 17, 25 are prevented from rotating by an independent double push prevention mechanism having balls 20, 27, respectively. . When the rotation of the main rotating shaft 39 is started, each of the first cam surfaces 23a, 29 of the first and second drive members 23, 29
a engages with the driven projections 17g, 25g of the first and second interposers 17, 25, respectively, and at timing 8, each interposer 17, 25 is moved to the operating position, that is, the position where it is latched to the latching plate 21. At the same time, the first and second actuating members 22 and 28 are moved to positions where they can come into contact with the unselected cam followers 35 and 36, respectively, in the direction of the arrow in the figure.

At this time, both interposers 17 and 25 are connected to the ball 2.
0, 27, but even if an attempt is made to operate a new key lever 5, each driven part 17g, 25g of the corresponding interposer 17, 25 will be separated from each corresponding drive member 23, 2, respectively.
The key lever 5 cannot be pressed down because it comes into contact with the second cam surfaces 23b, 29b of the key lever 9 and cannot rotate. Separately from this, when the previous interposers 17 and 25 are latched to the latching plate 21, the second release cam 4 is activated at timing @.
2, the first and second pressing operators 10 were pressed by
a, 11a are forcibly removed from their contact positions with the selection levers 12, 14, and the selection levers 12, 14 return to their original positions. The role of such a release operation is to prevent so-called repeat printing from being performed due to the continuation of the pressed state of the selection levers 12 and 14, and to instantly invalidate the operation of the key lever 5 that is subsequently pressed. The operator is informed that, although the key lever 5 operated immediately after this release operation is valid, it cannot be pressed at that moment due to the action of the second cam surfaces 23b, 29b of the drive members 23, 29. That's true. In summary, the simultaneous pressing of a plurality of key levers 5 is prevented by a mechanism having balls 20, 27, and immediately after the interposers 17, 25, which this mechanism cannot prevent, are latched, the second cam The surfaces 23b and 29b prohibit new operation of the key lever 5, and the second release cam 42
When the key lever 5 is released, all operations of the key lever 5 are disabled in a tactilely detectable state, and subsequent operations of the key lever 5 are enabled, but at that moment, the press of the key lever 5 can be tactually detected. This blocking state is then released in a tactilely detectable manner at the end positions of the second cam surfaces 23b, 29b. At timing 9 following such timing ◎, the cam member 33
, 34 respectively select the amount of rotation and the amount of tilt of the type head 2, and at the same time the type head 2 is urged toward the platen 1 by the printing cam 64 to perform a predetermined printing operation. second cam surface 23b,
29b is released, new rotation of the interposers 17 and 25, that is, a new pressing operation of the key lever 5 becomes possible, and then at timing [F], the locking plate 2 is first rotated.
The interposers 17 and 25 that were latched by 1 are unlatched and returned to their original positions, and at timing 8, the interposers 17 and 25 that were latched by
When one rotation is completed and the key lever 5 is not operated again, it stops there (strictly speaking, the clutch member 5 has already been engaged).
2 is in the released state and rotates by inertia up to this point), and when a new key lever 5 is operated after timing 5, the series of operations described above is repeated from timing 4 again.

As described in detail above, in the typewriter according to the present invention that executes a predetermined printing operation in response to the operation of a key lever, the conventional typewriter is provided with one interposer for each key lever, and the interposer is activated based on the operation of the key lever. The rotation amount selection mechanism and the tilting amount selection mechanism were configured to perform a predetermined selection operation based on the movement of the rotation amount selection mechanism and the tilting amount selection mechanism. One interposer is provided for each of the plurality of key levers to operate in common, and in response to the operation of one key lever, one interposer each on the rotation amount selection side and the tilt amount selection side is driven, and based on these, one interposer is driven on the rotation amount selection side and the tilt amount selection side. A predetermined printing operation is executed, and as a result, the number of interposers is greatly reduced, the total number of related parts is also reduced, the mechanism is simple, and the drive member and cam member are coaxial. The present invention is not limited to the typewriter shown in the embodiments, but can be modified in various ways, and its practical effects are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a perspective view that simply shows the overall structure of a typewriter according to the present invention, FIG. 2 is a sectional view showing the keyboard portion in detail, FIG. 3 is a partial plan view of the keyboard portion, and FIG. The figure is a perspective view showing the drive part of the typewriter.
FIG. 5 is a timing chart for explaining the operation of the typewriter. In the figure, 5 is a key lever, 17 and 25 are first and second interposers, 20 and 27 are balls constituting prohibition means,
21 is a latching plate serving as a latching means; 22 and 28 are operating members;
23, 29 are interposer driving means, 23a, 29a
is its first cam surface, 23b and 29b are its second cam surfaces, 33 and 34 are cam members, 35 is a cam follower of the rotation amount selection mechanism, 36 is a cam follower of the tilting amount selection mechanism,
39 is a main rotating shaft, 50 is a drive shaft, 52 is a clutch member of the clutch mechanism, and 63 is a return cam serving as a clutch release means.

Claims (1)

[Claims] 1. It has a spherical type head in which a large number of type characters are arranged in rows and columns around the circumference, and the type head rotates and tilts in response to the operation of an arbitrary key lever, thereby performing printing operation using a predetermined type. In the typewriter, the first interposer is moved by the operation of each key lever corresponding to a plurality of type characters arranged in the same row of the type head; a second interposer that is moved by operating each key lever that corresponds to a plurality of printed characters, respectively; and a second interposer that is moved by operating any one key lever; drive means for moving each of the first and second parts toward the operating position;
latching means for latching each of the second interposers in the operating position; and a mechanism for selecting and determining the amount of rotation of the type head depending on which of the first interposers is latched in the operating position. a movement amount selection mechanism; and a tilt amount selection mechanism for selecting and determining the amount of tilt of the type head depending on which of the second interposers is latched in the operating position; A typewriter characterized in that printing is performed using one selected type.