JPS6127743Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an electric typewriter.

The purpose of the present invention is to realize a simple carriage feeding mechanism that is durable and has low vibration.

Another object of the present invention is to provide a thin and compact electric typewriter.

Still another object of the present invention is that by adopting a step motor as the motor, it is possible to easily
An object of the present invention is to provide an electric typewriter capable of switching between elite characters.

As business becomes more international, the need for typewriters increases, and electric typewriters are attracting attention because of their ease of typing and good print quality.When used in the office, quiet and low-vibration typewriters are There is also a growing demand among businessmen, students, etc. for compact electric typewriters.

In consideration of such demands, the present invention attempts to solve the problem by using a screw connection in the carriage feeding mechanism and arranging the platen, the screw connection portion, and the motor so that they do not overlap in cross section.

A detailed explanation will be given below according to the drawings.

FIG. 1 is a front cross-sectional view of a conventional electric typewriter as viewed from the keyboard side, and FIG. 2 is a cross-sectional view of the central portion of FIG. 1 viewed from the side. Reference numeral 1 indicates a base frame, and 2 indicates a carriage support frame, which is fixed to the base frame by screws, welding, or the like. The platen 3 is supported by a platen support frame 5 fixed to the carriage 4 by screws or welding, and the platen 3, the carriage body 4, the platen support frame 5, etc. are collectively referred to as a carriage. The carriage has ball bearings 6
It is movably connected to the carriage support frame 2 via. One terminal portion of the coil spring 7 is coupled to a support portion 8 of the carriage support frame 2, and the other terminal portion is engaged with a spring support frame 9 that is integrally formed with the carriage body 4.

Normally, the carriage moves to the left as characters are typed from the right side, and when the carriage returns, the motor 10 rotates and the wheel 11 winds up the carriage line 12 whose one terminal is engaged with the spring support frame 9, and the carriage remains constant. It moves to the position against the reaction force of the coil spring 7. When a key on the keyboard is operated, the corresponding type lever 13 rotates and hits the paper held by the paper release plate 14 etc. supported by the platen 3 and the platen support frame 5 via the ink ribbon 15, and type characters are printed. be done. A gear 18 having a carriage gear 16 and an escape gear 17 is rotatably fixed by a stopper seat 19 via a carriage support frame 2 and a base frame 1. The pallet 20 is rotatably fixed by a stopper seat 22 via a spacer 21 and the base frame 1 so as to engage with the escape gear 17. The carriage is always pulled to the left by the coil spring 7, and since the hole 23 of the carriage body 4 is engaged with the carriage gear 16, the escape gear 17 is also always subjected to a rotational force in a constant rotational direction. Therefore, when the pallet pallet wheel 20 is driven by a solenoid (not shown) immediately after printing, the escape gear rotates by one tooth.
The carriage moves to the left and the carriage is fed.

FIG. 3 is a diagram showing the relationship between the pallet pallet wheel and the escape gear, and as described above, the escape gear 17 is always subjected to clockwise rotational force. The pallet 20 is normally attracted to the pin 25 by the pallet spring 24, and the escape gear 17 is attached to the claw portion 26.
rotation is stopped. Immediately after printing, when the pallet wire 27 is pulled by a solenoid or the like, the claw 26 and the escape gear 17 disengage and rotate, and then the claw 27 of the pallet 20 and the escape gear 17 engage, and the pallet wire 27 is suctioned. When the force is removed, the pallet spring 24 rotates the pallet, and the pawl 26 and the escape gear 17 are now engaged, resulting in a feed of one tooth of the escape gear. In order to improve the typing speed, it is necessary to feed the carriage in a short time.
Therefore, the coil spring 7 determines the carriage feed speed.
requires a certain level of strength or size. In addition, a cover is required around the coil spring so as not to interfere with its expansion and contraction movement.Furthermore, in order to effectively utilize the force that feeds the carriage, it is necessary to install the coil spring almost at the center of the carriage, and the coil spring overlaps the platen in cross section. It was getting thicker. Furthermore, the feeding mechanism uses engagement between a pallet wheel and escape gear, and between a carriage gear and a hole in the carriage body, but these are complicated parts and are difficult to manufacture, resulting in a large number of assembly steps and increased costs. Furthermore, since the feeding mechanism is a complicated mechanical connection, its durability is poor. Furthermore, when the carriage return was wound up by the motor, the motor suddenly stopped and the shock was so great that it was difficult to use. In addition, in the case of a continuous space, since the feed is continuous by engaging the pallet wheel and the escape gear, it rattles every time a character is fed, causing large vibrations and making it difficult to use.

The present invention eliminates the above drawbacks and will be explained below with reference to the drawings.

4 is a cross-sectional view of a plane perpendicular to the platen, showing an embodiment of the electric typewriter of the present invention. The carriage is constructed by integrating a platen support frame 33, which holds and fixes a platen 28, a paper release plate 30 having a paper roller 29, a release lever 31, and a paper presser 32, with a carriage body 34 by screws, welding, etc., and by fixing a feed female screw 35, which is a threaded portion that engages with a feed screw shaft 41, which is a trapezoidal screw, etc., to a support frame 37 by a screw 36, and further integrating the support frame 37 with the carriage body 34 by screws, welding, etc.

The carriage is connected to the chassis 3 via a ball bearing 38.
It is movably coupled to a carriage support frame 40 fixed to 9. A feed screw shaft 41 that engages with the female feed screw 35 is rotatably held by a motor support frame 42 fixed to the chassis 39 as a bearing. One end of the feed screw shaft 41 has a gear, which is engaged with a gear 44 of a motor 43 and a timing belt 45. A cylindrical petal-shaped printing wheel 47 having a type portion 46 is U-shaped so that its lever portion has sufficient springiness, and the motor 4 fixed to the chassis 39
It is fixed to the rotating shaft of 8. 50 is ribbon 49
It is a ribbon cartridge that stores. 51 is a motor that rotates the ribbon. Printing hammer 5
2 is supported by a hammer support member 53 and held in a fixed position by a coil spring 54 and an E-shaped retaining ring 55. Reference numeral 56 denotes an encoder having an optical sensor and detecting the position of the print wheel 47, and is fixed to the support frame 57. The printing solenoid 58 is fixed to the support frame 57 so that the printing hammer 52 is located on the extension line of the solenoid. key 5
9 is guided by the board 60 and is in contact with a contact rubber 62 having a conductive rubber 61. When the key 59 is pressed, the contact rubber 62 connects to a wiring pattern 64 on the circuit board 63.
The structure is such that the switch operates when the switch comes into contact with the switch.
On the circuit board 65 are motors 43, 48, 51,
A circuit for controlling and driving the printing solenoid 58 and the like is mounted, and these are called a circuit block. The circuit block is placed under the keyboard section to improve space efficiency. The contact rubber 62 and the rotary board 63 are arranged almost horizontally to improve the reliability and durability of key operations, and the key 59 has a step with a different length under the neck to make key operations easier. There is.

When the key 59 is pressed, a key signal is input to the circuit block, and the output of the circuit block causes the motor 48 to rotate and select a type. Next, a signal is applied to the printing solenoid 58, which moves the printing hammer 52 and the printing unit 46, and prints letters via the ribbon 49 onto the paper held by the platen 28, paper release plate 30, paper pusher 32, etc. At the same time as printing is completed, the motor 43 rotates by a certain angle by the output of the circuit block, and the carriage is fed by engaging the feed screw shaft 41 and the female feed screw 35. Therefore, since the carriage is fed by screw engagement, movement is smooth and durability is improved. Furthermore, since the carriage return, which conventionally caused particularly large vibrations, is threaded, the operation is smooth and vibrations are reduced.

Furthermore, since it is a screw connection, the structure is simple. Furthermore, as shown in the figure, a compact electric typewriter can be provided because the platen, the screw engaging portion of the feed screw shaft, and the motor for rotating the screw shaft do not overlap in cross section.

FIG. 5 is a diagram showing another embodiment of the present invention, in which the screw engaging portion of the female feed screw 66 is halved. By doing so, the female feed screw 66 can be attached and removed by the screw 67 at any position with respect to the feed screw shaft 68, further improving ease of assembly and after-sales service.

FIG. 6 is a view showing still another embodiment of the present invention, in which a carriage body 69, a carriage support frame 70
This shows a structure in which the engagement is arranged so that it does not overlap with the platen 71 in cross section, and the structure is further made thinner.
Furthermore, by engaging the feed screw shaft 72 and the female feed screw 73 inside the engagement between the carriage body 69 and the carriage support frame 70, the structure can be made more compact using space effectively.

FIG. 7 is a view showing another embodiment of the present invention, in which the engagement between the carriage body 74 and the carriage support frame 75 is carried out by a ball bearing 76 on one side, and a straight portion 110 of the carriage body 74 on the other side by a carriage support frame. ,
75 is a diagram showing a structure to be inserted into a guide portion 111.

The longitudinal and horizontal movements of the carriage are regulated by the straight portion 110 and the guide portion 111, and the vertical movement is prevented by the engagement of the feed screw shaft 77 and the female feed screw 78. Such a structure not only simplifies the structure, but also requires only one side of the ball bearing, which simplifies the shape of the parts and makes them easier to manufacture, reducing costs.

FIG. 8 is a diagram showing another embodiment of the present invention, which is another embodiment of the structure shown in FIG. 6. The carriage body 79 is movably attached to a bearing plate 82 fixed to a carriage support frame 81 via a ball bearing 80.

Similarly to FIG. 8, FIG. 9 is a diagram showing another embodiment of the structure shown in FIG. 6, in which the carriage body 83 and the carriage support frame 84 are in highly precise mechanical surface engagement.

In Fig. 4, a pulse motor is used for the motor 43, a Pica/Elite switch is provided for the key 59, etc., a pulse control circuit is provided for the circuit block, and the drive pulse ratio of the pulse motor is set to Pica/Elite 6:5. This allows for easy carriage feeding of both Pica and Elite characters, and by replacing the printing wheel 47 with Pica or Elite, the typewriter can be used for both Pica and Elite.

FIG. 10 shows an embodiment of the Pica Elite pulse control circuit. FIGS. 11 and 12 show timing charts thereof. 85 is a clock signal, part A is
Positive trigger flip-flops 86, 87, 88
Quintal counter with AND gate 89, B part is positive trigger flip-flop 105, 106, 107
It is a hexadecimal counter consisting of , and in the figure it is on the elite or quinary side. When the key 91 is operated, a signal is input to the delay circuit 92, and after delaying the printing time, a signal 93 is synchronized with the clock signal 85.
enters the reset terminals of flip-flops 86, 87, 88 and positive trigger flip-flop 94 and resets each flip-flop. When reset, the output 95 of the flip-flop 94 becomes "1".
The clock signal 85 appears at the output 97 of the AND gate 96. Since the input 103 of the AND gate 102 is "0", the output 104 of the OR gate 101 becomes "0" and the output 97 is passed through as is. After being reset, the output 95 of the quinary counter becomes "0" at the sixth pulse of the clock signal, and the output 97 of the AND gate 96 also becomes "0".

The signal of this output 97 causes the transistor 98 to
Drive the pulse motor 99 for 5 pulses via
Carriage feed. 100 is a power supply.
When the switch 90 is switched to the hexadecimal side as shown by the broken line, the signal 93 resets the positive trigger flip-flops 105, 106, 107 and the positive trigger flip-flop 108 constituting the hexadecimal counter. Output 109 of flip-flop 108
becomes "1", and the clock signal 85 is output from the AND gate 102. As in the case of the quinary circuit described above, this time, since the output 97 entering the OR gate 101 is "0", the output 104 is passed through as is. After being reset, the output 109 of the hexadecimal counter becomes "0" at the seventh pulse of the clock signal, and the output 104 of the AND gate 102 also becomes "0".

This signal 104 drives the pulse motor 99 by six pulses via the transistor 98 to feed the carriage. In the figure, explanation was given in quinary and hexadecimal, but the pulse ratio of pica and elite should be 6:5, and if it is an integral multiple of this, both can be used.

As detailed above, the screw joint of the present invention is quiet with little vibration, and by arranging the platen, screw joint, and motor so that they do not overlap in cross section, it can be made compact, and the step motor and pulse control circuit can be made compact. When used in combination, this is a very effective method for providing a multi-functional electric typewriter.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of a conventional electric typewriter viewed from the keyboard side. Figure 2 shows
FIG. 2 is a cross-sectional view of the central part of FIG. 1 taken in a direction perpendicular to the plane of the paper. FIG. 3 is a plan view showing the relationship between a conventional pallet pallet wheel and an escape gear. FIG. 4 is a cross-sectional view of the electric typewriter of the present invention in a plane perpendicular to the platen. Figure 5, Figure 6, Figure 7, Figure 8,
FIG. 9 is a sectional view taken along a plane perpendicular to the platen, showing another embodiment of the present invention. FIG. 10 is a diagram showing an embodiment of a pulse control circuit for switching between pica and elite according to the present invention. Figure 11 a, b,
12a, b, c, and d are diagrams showing timing charts of the pulse control circuit. 1... Base frame, 2... Carriage support frame, 3...
platen, 4...carriage body, 6...ball bearing,
7... Coil spring, 8... Support part of carriage support frame, 9... Spring support frame, 10... Motor, 1
1...Wheel, 12...Carriage line, 13...
...Type lever, 14...Paper release plate, 1
5... Ink ribbon, 16... Carriage gear,
17...Escape gear, 18...Gear, 19...Stop seat, 20...Ankle, 21...Spacer,
22... Stop seat, 23... Hole in the cartridge body, 2
4...Ankle spring, 25...Pin, 26...Ankle tab, 27...Ankle tab, 2
8...Platen, 29...Paper roller, 3
0... Paper release plate, 31... Release lever, 32... Paper pusher, 33... Platen support frame, 34... Carriage body, 35... Feed female screw, 36... Screw, 37... Support frame , 38... Ball bearing, 39... Chassis, 40... Carriage support frame, 41... Feed screw shaft, 42... Motor support frame, 43... Motor, 44... Gear, 45...
...Timing belt, 46...Print section, 47...
Printing wheel, 48...Motor, 49...Ribbon, 50...Ribbon cartridge, 51...Motor, 52...Printing hammer, 53...Hammer support member, 54...Coil spring, 55...E-shaped stopper Ring, 56...Encoder, 57...Support frame,
58...Printing solenoid, 59...Key, 60...
... Board, 61 ... Conductive rubber, 62 ... Contact rubber, 63 ... Circuit board, 64 ... Wiring pattern,
65...Circuit board.

Claims (1)

[Scope of utility model registration request] In an electric typewriter consisting of each element of a keyboard, a printing mechanism, a carriage having a platen, and a driving means for the carriage, each of the elements is arranged side by side on the chassis in the order of the keyboard, printing mechanism, carriage, and driving means without overlapping each other. The printing mechanism includes a first motor having a rotating shaft perpendicular to the chassis, a cylindrical petal-shaped printing wheel connected to the rotating shaft and rotating parallel to the chassis, and a cylindrical printing wheel. The petal-shaped lever of the printing wheel is bent downward in a substantially U-shape along the outer periphery of the first motor, and the driving means is formed of a platen. a female threaded portion provided on a carriage having a threaded portion, a male threaded portion that engages with the female threaded portion, and a second motor that rotates the male threaded portion by a timing belt, the platen, the threaded portion, and the second motor. An electric typewriter characterized by the fact that these are placed side by side on the chassis.