JPS6351141A - Small-sized printer - Google Patents

Abstract

PURPOSE:To reduce the number of assembling processes and to automate assembling, by clamping both ends of a plate material having each mechanism set thereto to a frame from above by screws and pushing a platen having a paper feed mechanism united therewith in the frame from above with springiness to engage the same with said frame. CONSTITUTION:A type sheet receiver 9, an electromagnet 4, a hammer 6 and a motor 14 are formed into one set to be clamped to a frame 1 from above by screws. A platen 11 having a paper feed member set to the lateral part thereof is also clamped to the frame from above by an one-touch system utilizing springiness and an ink roll 13 is further inserted in the frame 1 from above at a place positioned on the side opposite to the platen 11. A reversal preventing lever support supporting a reversal preventing lever 24 is also clamped to the frame 1 from above by a screw. Therefore, assembling can be easily performed and the number of processes can be reduced. Further, assembling is also automated in an extremely easy manner and assembling cost becomes inexpensive.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention uses a small printer, more specifically, a motor to rotate a type wheel and feed paper, and to obtain at least a type wheel selection process, a printing process, and a paper feeding process. [Prior art] Regarding a small printer that completes one print cycle by
As mentioned in the publication, in order to fix the type belt hammer assembly unit to the main body frame, a support plate formed integrally with the yoke is fixed to a bracket, and this bracket is laterally screwed to the main body frame with screws. are doing. Furthermore, the motor is screwed laterally to the main body frame. Furthermore, the rubber roller for paper feeding is also inserted into the main body frame from the side and secured with an E-shaped retaining ring.

[Problem that the invention seeks to solve]

Therefore, in the conventional structure, each mechanical component is set horizontally relative to the main body frame and secured with screws or E-shaped retaining rings, which makes assembly difficult and requires a lot of man-hours. Ta. Furthermore, even when considering assembly automation, setting in the horizontal direction is not safe, but it becomes very difficult, and even if it were possible, there were problems such as a long assembly cycle.

Therefore, in order to solve these conventional problems, the present invention has a structure in which all parts are assembled into the main body frame from one direction from the top, thereby reducing assembly man-hours and further facilitating assembly automation. It is aimed at something.

[Failure to solve the problem]

In order to solve the above-mentioned conventional problems, the present invention sets the selection, printing, and motor mechanisms on one plate, screws both ends of the plate to the frame from above, and also provides a paper feeding mechanism using the platen. The structure is such that the platen can be pushed in from above and engaged using seven frames and a spring structure.

[Effect]

As described above, since the structure allows parts to be assembled from above, the number of assembly steps is small and assembly automation is possible.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1, 2, and 5.

FIG. 1 is a perspective view, FIG. 2 is a side sectional view, and FIG. 3 is a plan sectional view.

1 is a frame. 2 is a first printing yoke, which is screwed to both ends of the frame 10. The first printing yoke 2 has long strip portions 201 and 202 at both ends, and has a yoke portion 205 in the center that is U-shaped. A second printing yoke 3 is provided to cover this U-shaped folded portion. Second
There are holes in the printing yoke 3 according to the digits, and holes 501
The printed core 5 is caulked and installed. A printing coil 4 is provided in the U-shaped interior of the first printing yoke 2, a printing iron core 5 is placed in the center hole of the printing coil 4, and a printing suction plate 7 is inserted into a recess 601 provided in the hammer 6. This is the provision. When the printing coil 4 is energized, the printing suction plate 7
is attracted to the printed iron core 5 and moves. At this time, the hammer 6 also moves together with the print suction plate 7.

A type sheet 8 and a type sheet holder 9 are rotatably arranged around the first printing yoke 20. The type sheet holder 9 has a hole 901 on the outer periphery and a protrusion 80 provided on the type sheet 8.
1 has entered the hole 901.

One end of the type sheet support 9 is rotatably supported by a type bearing 10. The type bearing 10 is fixed to a long strip @201 at one end of the first print yoke 2. The type sheet 8 has type characters 802 on its surface and protrusions 801 on its back side.
This corresponds to When the printer 6 presses the protrusion 801, the type 802 protrudes and transfers ink onto the printing paper 12 at an angle of θ on the platen 11. 13 is an ink roll. A motor 14 is directly connected to one end of the type sheet holder 9. The protrusion 902 of the type sheet holder 9 is included in the part 151 of the outer case 15 of the motor 14, and the rotation of the motor 140 is directly transmitted to the type sheet holder 9. The motor 14 has a motor coil frame 16. Motor yoke 17. Motor magnet 18. Outer case 15. It consists of a motor magnet yoke 20. This is a so-called outer rotor type step motor. The motor coil frame 16 is fixed to the long strip 202 of the first printing yoke 2, and also serves as a bearing for the outer case 15. Two-phase coils are wound around the motor coil frame 16, resulting in a total of four coils.If a predetermined pulse is applied to these coils, the outer case 15. Motor magnet 18. The motor magnet yoke 20 rotates as a unit.

Ratchet teeth 152 are provided on the outer periphery of the outer case 15, and are engaged with the anti-reverse lever 24, so that the ratchet teeth rotate in the direction of arrow B, but not in the direction of arrow B. (See Figure 8). 22 is a paper feed rubber, and 23 is a paper feed gear. Intermittent teeth 905 provided on the type sheet holder 9
When it meshes with the paper feed gear 23, the paper feed rubber 22 rotates by a predetermined angle and feeds the paper 12 printed by the company.

25 is a reset spring which serves as a mechanical contact, and the cam 904 provided on the type sheet receiver causes the type sheet to be set at 1 of the type sheet receiver 9.
[A set pulse is output once every 14 turns.

The arrangement of 80 characters on a type sheet is shown in FIG. Print.

The sheet 8 is shown in an unfolded state, with the vertical axis indicating the character position and the horizontal axis indicating the digit. The letters are arranged in a staggered manner, 1
Each hammer width has a width of two digits, so one hammer can control two digits of width. When the motor 14 rotates in the direction of the arrow, the printing position 19 starts from "Space 3", "Even -", "Odd 0", "Even 0".
” in order. This relationship is shown in the column of characters in the time chart of FIG.

The operation of the mechanism having the above configuration will be explained.

First, in the position of the type sheet 80, the 30 space character position is located at the position facing the hammer 6 (printing position 19). Here, the motor 14 is energized and rotated in the direction indicated by the arrow. The motor 140 is energized in a manner such that the four coils of the motor 14 are energized as shown in the time chart of FIG. This energization is as shown in Figure 9, which shows the state of the pulses applied to the transistors ■ to ■ that are applied to the motor coils ■ to motor coil ■. 915462A8 will be explained. 9 energizes the motor coil ■■, 1 energizes the motor coil ■, 5
is ■■, (4] is ■, 6 is ■■, 2 is ■, A is ■■, 8
means to energize each of ■.

Here, in order for the motor 14 to rotate normally, the motor energization mode 915
462A8 should be energized in this order. Further, the relationship between the energization mode of the motor 14 and the character position is shown in FIG. 4, so that if an odd number is energized by a person and an even number is energized by a 5, a predetermined character will be placed at the printing position 19. There is. Print position fi1
When printing when a predetermined character arrives at 9, the motor 14
The energization mode is energized in the direction in which the motor 14 rotates in reverse. At this time, the motor 14 tries to rotate in the direction of arrow B, but
The anti-reverse lever 24 and the ratchet teeth 152 come into contact with each other, and the motor 14 is reliably stopped at a predetermined position. This motor 1
4 is stopped and the printing coil is energized, the hammer 6 pushes the protrusions 801 on the type sheet 8 and transfers the type 802 onto the printing paper 1.
2 can be printed. This is done in the same way for each character honing. When a character position that is not to be printed comes, the motor 14 continues to rotate in the direction of arrow A. When the character position reaches "even 11", the selected printing of the type is no longer possible. finish. When the motor 14 is further rotated, the type sheet holder 9
Intermittent teeth 903 provided at the paper feed gear 23 mesh with the paper feed gear 23 to feed the paper. A reset pulse is issued during this paper feeding.

Since this structure directly connects the motor 14 and the type sheet 8, when the motor 14 is stopped for printing, the type sheet holder 9 can also be stopped immediately. When stopping the motor 14. The reversing movement of the type sheet holder 9 can be quickly stopped at a predetermined position by the reverse stop plate 24 and the ratchet teeth 152, and therefore the type sheet holder 9 can also be stopped. In this case, as shown in FIG. 6, the movement of the motor 14, which was conventionally shown by the broken line, changes to the movement shown by the solid line, and the motor 14 is stopped for a short time t.

When the motor 14 is stopped for printing, an energization mode that gives reverse rotation is performed, but in the present invention, this energization mode is continuously ON-OF'? is repeated, and the average current consumed by the motor 14 at this time is as shown in Figure 7, and the current value when it is always in the 011 state (shown by the broken line)
It takes much less than that.

In this embodiment, a step motor is used to intermittently move a type sheet holder with type placed on its surface, and when printing, the step motor is energized to stop or rotate in reverse. Since the motor can be stopped quickly and accurately at a predetermined position by the action of the lever, the printing speed can be increased to the same speed as the valve material. In addition, the linearity of the printed characters is very good because it can be stopped at an accurate position, and the positional relationship between the hammer and the protrusions on the type sheet is also appropriate, so there are no omissions and the printing quality is good overall. We can supply printers with high performance.

Also, is the energization mode 0N-OF to stop or reverse the step motor? Since this process is repeated repeatedly, power consumption is extremely low, and therefore, heat generated by the motor can also be reduced.

FIG. 10 shows another embodiment of the present invention, which is basically the same as FIG. 1, but the layout is slightly different and the way it is attached to the frame is shown in more detail.

41 is a frame, 42 is a type sheet, 43 is a type sheet holder, and 44 is a type bearing, which is integrally molded with the member for setting the reset spring 25. Reference numeral 45 denotes a platen, which is provided with a groove 451 that engages with a pin 411 provided on the frame 41, and a hook portion 4 provided on the frame with spring properties.
12 is provided. platen 45
As shown in FIG. 11, the paper feed gear 46 and the paper feed rubber 4
7, so move the platen 45 to the frame 41.
If it is assembled from above, the hook portion 412 and the portion 452 will engage and can be attached.

Reference numeral 48 denotes a backstop bar support that supports a backstop lever (not shown), and is fixed to the frame 41 from above with screws 49. Reference numeral 50 denotes an ink roll case containing an ink roll, which is assembled into a frame 410 and a groove 413 from above.

A cross-sectional view of the ink roll with the ink roll attached is shown in FIG. 12, 52 is the ink roll, 50 is the ink roll case, and 53 is the ink roll spring.

51 is a motor. Type sheet 42. Type sheet holder 4
3. Type bearing 44. The motor 51 is attached as a unit to a yoke of an electromagnet (not shown), and is attached to the frame 41 by screwing from above on both sides.

〔Effect of the invention〕

As explained above, the present invention consists of a type sheet holder, a magnet, a hammer, and a motor as one set, which is screwed onto a frame from above, and a platen with a paper feeding member set on the side thereof is also attached to the frame. It is designed to be stopped with one touch from above using spring properties, and furthermore, the ink roll is inserted from above at the opposite side from the platen, and the reverse stop lever is supported.
The bar support used to prevent reverse rotation is also screwed to the frame from above. Therefore, it can be easily assembled and requires less man-hours. Furthermore, it is very easy to automate the assembly and the assembly cost is low.

By assembling from above, the positional relationship of each part can be managed on the same plane, which improves important positional accuracy, such as the gap between the platen and type, and as a result, print quality is excellent with no variations. It has the effect of becoming something special.

Also, on the layout, type sheet holder unit, platen,
Since the ink ribbon and the reverse stopper support are arranged almost on the same plane, there is no need for assembly or disassembly in any order, so there is an advantage that maintenance and repair does not require much effort.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a side sectional view,
FIG. 5 is a plan sectional view. FIG. 4 is a developed view of the arrangement of characters on a type sheet according to an embodiment of the present invention. FIG. 5 is a time chart diagram of an embodiment of the present invention. FIG. 6 is a diagram showing the movement of the motor in the embodiment of the present invention. FIG. 7 is a diagram showing the amount of current consumed by the motor according to the embodiment of the present invention. FIG. 8 is a diagram showing ratchet teeth and reverse rotation prevention means in an embodiment of the present invention. FIG. 9 is a diagram showing a circuit for driving a motor according to an embodiment of the present invention. FIG. 10 is a perspective view of another embodiment of the present invention. FIG. 11 is a perspective view showing the platen of FIG. 10 in detail. FIG. 12 is a cross-sectional view of the ink roll case shown in FIG. 10 with a mounting frame attached. 1... Frame 2... First printing yoke 3... Second printing yoke 4... Printing Coil 5......Print core 6...Q...No 1 Inma 7...Print suction plate 8...Active ? 9......Type sheet holder 10...Type bearing 11...Platen 12...Printing paper 13...Ink roll 14...Motor 22...Paper feed rubber 23...Paper feed gear 24...Reverse stop lever 25...υ set spring 152 ... Ratchet teeth 41 ... Frame 42 ... Type sheet 43 ... Type sheet holder 45 ... Platen 46 ... Paper feed gear 47...Paper feed rubber 50...Ink roll case 51...Motor 52...More than ink roll LFI agent Seiko Epson Co., Ltd. Patent attorney Mogami Suji (1 other person)'1! -J Figure 6 Figure 7 Figure 8 Figure 9 Figure 11 Figure 12151

Claims (1)

[Claims] A motor, a type sheet holder with type arranged on a rotating surface that receives driving force from the motor, an electromagnet/hammer for selectively printing the type from the inside of the type sheet holder, and a holder for printing paper during printing. In the printer, the motor, the type sheet holder, and the electromagnet/hammer are preferably connected to the electromagnet. The platen is set on a plate-like member integrated with the yoke and fixed by screwing the plate-like member from above to the frame, and the platen is pushed in and set from above using a hook having a spring property with respect to the frame. A small printer characterized in that the ink roll is pushed into the type sheet holder from above and set in a position opposite to the platen.