JPS5833483A - Light detecting apparatus of printer - Google Patents

Abstract

PURPOSE:To reduce a number of parts as well as to enhance quality, by providing one hole having a different angle pitch to a detecting plate attached to a basic gear rotating once during one printing cycle other than plural holes having a same angle pitch. CONSTITUTION:A crank shaft 53, a basic gear 74, a detecting plate 83 synchronously rotating along with the basic gear 74, a light detector 84 generating a synchronous signal of a printer, especially, with the letter position, a luminous diode 85 emitting light of the light detector and a phototransistor 86 are provided. In this apparatus, plural holes T0-T13 having a same angle pitch for letter position pulse and one hole T14 for ascertaining reference pulse having a pitch longer than the pitch of the holes T0-T13 are provided to the detecting plate 83.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for generating electrical signals for a type wheel selective layer printer.

Electric signal generator for conventional type wheel selection type printer
will be briefly explained using FIGS. 1 and 2.

FIG. 1 is a side sectional view, and FIG. 2 is an a-side view. Reference numeral 1 denotes a type wheel shaft that supports a type wheel 2 having type letters arranged on its outer periphery, and a spline portion 5 and a notch portion 4 are provided in a part of the type wheel shaft 1 . 5 is a type mold that engages with the spline portion S of the type wheel shaft 1 and is rotatably attached to a part of the type wheel 2. Reference numeral 6 denotes a type-shaped spring, and 7 denotes an electromagnet suction plate that engages with the type-type and also engages with the electromagnet core B. 9
1 is an electromagnetic coil, and 10 is an electromagnetic attraction leaf spring.

11 is a detection plate fixed to the notch lI4 of the type wheel spindle 1 and serves to block the light from the photodetector 12;
is a mask lever that is rotatably mounted on the type wheel shaft IK and blocks the light from the photodetector 12 as necessary. 14
is the driven gear that drives the type wheel shaft 1, 15i! , are transmission gears that transmit power from the basic gear 16 to the driven gear 14&C, and 17 is a mask lever drive cam attached to the basic gear 16. 1!1ij mask lever spring, 1! is the mask lever mounting shaft.

Next, the operation will be briefly explained. The operation of printing one line is divided into selection, printing, and reset operations, and each operation will be explained.

The selection operation is to guide the desired type to the printing position, and the type wheel shaft 1 is rotated in the direction of the arrow by the basic gear 1611C, and when the desired spline @S comes to the position of the type mold 5, the electromagnetic coil 9 is energized. made, electromagnetic attraction 1 [7,
The WI-shaped nail type is written in the direction of the arrow, and the type type 5
The type wheel shaft 1 engages with the type wheel 2, and the type wheel 2 rotates together with the type wheel 2 until it reaches the printing position. Next, the basic gear 14Fi starts printing operation.
The basic gear 16 and the transmission gear 15 form a Geneva mechanism, and the transmission gear 15 stops during the printing operation. In the meantime, mark the desired type! ! 11 Transferred to paper via ink.

Next, the reset operation will be explained. The basic gear 14 and the transmission gear 15 become gear transmission again and start rotating in the direction of the arrow IFi of the type wheel shaft IFi. The type wheel 2 and the type mold 5 rotate together with the type wheel axle 1 until they engage the electromagnetic suction '#17.

Incidentally, during the reset operation, the electromagnet coil 9 is de-energized and the electromagnet attraction plate 7 is returned to the standby position by the spring force of the electromagnet attraction plate spring 10.

Furthermore, the movement of the mask lever 1.3 in each operation will be explained. During the selection operation, the mask lever 15 is in the standby position shown in FIG. 2 and does not block the light from the photodetector 12.
When the printing operation begins, the mask lever 15 is rotated in the direction of the arrow by the mask lever drive cam 17 attached to the basic gear 16, and blocks the light from the photodetector 12. Mask lever 1! ij, at this position until the reset operation is completed. At the same time as the reset operation ends! The souffle bar 13 is moved to the standby position Kj by the mask lever spring 18.
Ill.

Next, the aforementioned! Skleno! To explain the timing pulse of the type wheel selection lid printer made by -15,
In this example, the selection operation generates a type positive pulse corresponding to the type placed on the outer periphery of the first type ring 2. In this example, the light from the photodetector 12 is generated from the 0th order printing, in which 16 pulses are generated, to the reset operation. Because of the interruption, a pulse interval that is sufficiently longer than the pulse interval from one type positive pulse to the next type positive VW pulse occurs. The reference type body pulse is determined for each printing cycle using two pulses with different pulse intervals. In addition, mask lever 1!
There are 11 ways to block light: Detection of printing operation 1
[This is the second most commonly used method to eliminate pulse cracking due to chatter in the circumferential direction due to printing of number 11, and to eliminate wrinkles in pulse intervals during reset operations.

The above is a description of the conventional photodetection device of a type wheel selection printer, and the drawbacks of the conventional method will be explained below. Since a mask mechanism is added to the pulse generator, the number of parts increases, the assembly is complicated and takes a long time, and the cam part needs to be designed with reliability in mind. Therefore, there were drawbacks such as design, reliability, and test load.The present invention improves these drawbacks.

An object of the present invention is to provide a photodetection device for a printer that has a small number of parts.

Another object of the present invention is to provide a photodetection device for a printer that is easy to assemble and has stable and reliable five-mechanism operation.

Examples according to the present invention are shown in FIGS. S, 4, and 5.

This will be explained using FIGS. 6 and 7.

FIG. 5 is a side sectional view showing an embodiment of the present invention, and FIG.
The figure shows a side view.

31 is a type ring with type s2 arranged on the outer periphery, 5! S#i is a spline part of a type wheel shaft 35 that pivotally supports the type wheel s1 and engages with the type weight 4 rotatably attached to a part of the type wheel s1, a 54Fi type pawl spring, and 57 a detent spring. , s8 guides the type ring 31 in the sliding direction 2
4 type ring guides, 59 is an electromagnetic coil, 40 is an electromagnetic core, 41 is an electromagnetic suction plate, 42 is a type pawl support member engaged with the electromagnetic suction plate and the type mold s4, and 4s is an electromagnetic coil 5! A wiring board 44 is soldered to the subframe, and the electromagnet core 40 is caulked.

4s is attached to the subframe 44, and the type wheel guide 3
B. Type nail support material 42. This is a mounting plate for attaching 17. 46 is a type wheel shaft alignment part provided in a part of the type wheel shaft SS, 47 is a clamp plate for aligning the type wheel shaft 55, 48 is a clamp @ rotating shaft, 49 is a clamp spring,
50ij A type wheel alignment section provided on the type wheel 51, 51 is a type wheel clamp that enters the groove of the type wheel alignment section 50 to align the type wheels s1, and the type wheel clamp 51 is spot S* on the clamp plate 47. . The clamp plate 47 has a portion that engages with the clamp cam S2. ! ! Ink is a clamp shaft, 54 is a printing roller that is aligned with the printing position tvc and prints the next character B2, 55 is a printing roller support plate, 56
is the printing roller drive shaft. 57Fi ink roller, 5
8 is the ink roller shaft, 5? 61 is a paper feed roller that feeds the printing paper 60, 61 is a presser roller that applies a load to the paper feed roller 59, 62 is a presser roller shaft, 63 is a paper feed windmill, 64 is a paper feed electromagnetic core, 45ij is a paper feed electromagnetic coil, and 66 is a Paper feeding electromagnet suction plate, 67 is a paper feeding electromagnet suction plate spring,
68 is a paper feed shaft. 6! is a motor, and 70 is a motor shaft. 71 is a motor gear, 72 is a reduction gear, 7 is a reduction gear shaft, 74 is a basic gear, 75 is a transmission gear, 76 is a driven gear, 77ij is an ink roller drive gear, 78 is a print drive gear, 79 is a paper feed gear, 80 is a printing cam, 81 is a printing cam return spring, and 82 is a driven gear shaft.

Next, each crop rotation will be explained. First, we will explain how to print one line using 6 steps. “When a print signal is generated in the control unit of the printer, the motor 69 is energized, and the motor gear 71Fi rotates in the direction of the arrow.
4Ki1 conversion can be reported. Also, motor gear 71. Reduction gear 72. The rotation is also transmitted to the printing drive gear 78. If one line of printing cycle is one printing cycle, basic gear 7
4 and print drive gear 78#i, rotate once per print cycle. First, the selection of the type ring 31 will be explained.

The basic gear 74 rotates and the rotation is transmitted to the transmission gear 75 and further to the driven gear 76. The type wheel shaft 55Vi rotates in the direction of the arrow, and the groove of the spline 1135 and the protrusion of the type mold 34
When a text position corresponding to a desired printed character 32 is reached, the position is made to correspond to a photodetection device, and the printer control section takes out the signal and energizes the electromagnetic coil 39. After the electromagnet coil 39 is energized, a magnetic circuit is generated in the electromagnet iron core 40 and the electromagnet suction plate 41, and the electromagnet suction plate 4
1 rotates in the direction of the arrow. The type claw support member 42 also moves in the direction of the arrow together with the electromagnetic suction plate 41, and is released from the type mold 34. The type mold 34 rotates in the direction of the arrow, engages the groove of the spline portion 55, and rotates together with the type wheel shaft 65. The type wheel 51 rotates together with the type wheel shaft 55 by absorbing the spring force of the detent spring 37 along with the movement of the type mold 54. The type wheel 51 is provided with a type wheel guide 38 which is a guide in the thrust direction of the type wheel shaft 35, and prevents a chisel or the like during rotation.

Next, the type wheel alignment process will be explained. When selection 1 is completed, the transmission of rotation between the basic tooth fL74 and the transmission gear 75 is stopped by the Geneva mechanism, and the transmission gear 75 is stopped.

Accordingly, the desired type 52 is at the horizontal printing position W1 (on the line connecting the axis of the type wheel shaft 35 and the axis of the print drive shaft 56).
Since the clamp shaft 53 is rotating in synchronization with the basic gear 74, the clamp cam 52 fixed to the clamp shaft 53 continues to rotate, pushing up the cam St of the clamp plate 47, and pushing up the cam St of the clamp plate 47. The clamp plate rotates in the direction around the clamp plate rotating shaft 4B. As the first stage, the clamp plate 4
7 enters the groove of the type wheel shaft alignment w546 while correcting the position of the type wheel shaft 550 in the circumferential direction. In the second stage, the type ring clamp 51 is inserted into the groove of the type ring alignment part 5o provided in the type ring 51 while correcting the position in the circumferential direction.

As a result, the type 32 is stopped in the correct position. After this, the clamp plate 47ij, upon completion of the printing process, the cam connection between the clamp cam 52 and the clamp $47 is released, and the spring force of the clamp spring 49 causes the clamp plate 47ij to return in the direction opposite to the arrow.

Next, the printing process S will be explained. As described above, the printing drive gear 78ij rotates once in one printing cycle. A cam is provided on a part of the print drive gear 56, and a print cam 80 fixed to the print drive shaft 56 is engaged with the cam to align the print characters 32t, and then the print roller 54 is rotated in the direction of the arrow to remove the print characters 52.
t-press. At this time, since the type 52VcFi and the ink roller 57 have passed through the holes and the ink has been applied, when the printing paper 60 is sandwiched and pressed as shown in the figure,
The printed characters s2 are transferred to the printing paper 60. Print roller 54'
Fi is then returned to its original position by another mechanism.

Next, a process of resetting the printed characters 32 will be explained. Basic gear 7
4 and the transmission gear 75 are completed, and in the reset process, the transmission -
The wheel 75 is rotated. At the same time, the type wheel shaft 55. The type 34 starts rotating again in the direction of the arrow. Type nail support material 4
2 returns to the standby position by its own spring force since the electromagnetic coil 39 is not energized after the printing process. When the type mold 34 and the type pawl support 42 are re-engaged, the type mold 34 moves in the direction opposite to the arrow and stops at a position beyond the outer periphery of the spline s5!1.

At this time, the detent spring 57 enters the detent groove of the type wheel train and is reset to the standby position of the type wheel 31ij.

In this way, all the printed characters 52 are reset, and the reset process ends. Zero or more is a one-line printing operation.

Next, the paper feeding operation for one line will be explained. In the present invention, a single line printing operation is performed during the selection process. When the printer control unit issues a paper feed signal, the paper feed electromagnetic coil 6
5 is energized, the paper feeding electromagnet suction plate 66 moves in the direction of the arrow and is disengaged from the paper feeding windmill 65. The paper feed electromagnet iron core 64 has two parts: a part that is the center of rotation of the paper feed electromagnet suction plate 660, and a part that forms the magnetic circuit t-4. By the way, the paper feed shaft 68Vi constantly rotates during one printing cycle in synchronization with the print drive gear 78 and the paper feed gear 79 which are gear-coupled. When released, the paper feed windmill 63 engages with the paper feed shaft 68 and rotates by a cool latch mechanism (a spring clutch mechanism in the present invention). The rotation angle of the paper feeding windmill 63 is determined by dividing the windmill of the paper feeding windmill 63 into 10 in the circumferential direction, and the angular pitch of one windmill is 1.
When the power to the 0 paper feed electromagnet coil 65 designed to feed paper in rows is cut off, the paper feed electromagnet suction plate 6
6#'i, the paper feed electromagnet is rotated by the spring force of the suction plate spring 67 in the direction opposite to the arrow. The paper-feeding electromagnet suction member 66 rotates together with the paper-feeding shaft 68 and engages with the paper-feeding electromagnet suction plate 66 when the portion of the windmill of the next paper-feeding windmill 63 that engages with the paper-feeding electromagnet suction plate 66 rotates together with the paper-feeding shaft 68 . It returns to the original standby position before it rotates to the starting position. When the paper feeding windmill 65 and the paper feeding electromagnet suction plate 66 engage again, the rotation of the paper feeding shaft 68 is no longer transmitted to the paper feeding windmill 65, and the rotation of the paper feeding windmill 65 is transmitted to the paper feeding roller 59. Printing paper 60t - The rotational force of the paper feed roller 59 can be transmitted to the printing paper 60vc by applying an appropriate load with both the paper feed roller 59 and the paper presser roller 61.One or more paper feed operations for one line This is an explanation.

FIG. 5 is a side view of the photodetector of the present invention, FIG. 6 is a plan cross-sectional view, and FIG. 7 is a timing chart showing one printing cycle. ' 5! SFi clamp shaft, 74 is a basic gear, 83 is a detection plate that rotates in synchronization with the basic gear 74, 84 is a photodetector that generates a signal for the ij printer, especially a synchronization signal with the type positilon, and 85 is a photodetector that generates light for the photodetection device. A light emitting diode 86, which is an electronic component, is a phototransistor for receiving light. A light emitting diode 8 is attached to the photodetector mounting member 87.
5 and a phototransistor 86 are fixed to each other.
, the photodetector 84 is attached to the frame with screws or the like.

Next, the principle of pulse generation will be explained. A current is constantly supplied from the control section of the printer to the light emitting diode 85 so that it emits light. The light from the light emitting diode 85 passes through the slit of the photodetector mounting member 87 and passes through the photodetector mounting member 87 on the side where the phototransistor 86 is attached.
facing the slit. There is a space between the two slits into which the detection plate 8Is is inserted, and the opening of the detection plate 83 allows the light to pass through as it is, while blocking the other light.

The passed light is sensed by a phototransistor 86 and output as an output voltage. The next voltage #-1 is output and sent to the printer control S via a lead wire or the like.

When the light is completely cut off, no output voltage is generated from the phototransistor 86.

As mentioned above, the basic wheel 74 rotates once in one printing cycle, and the detection plate 83 similarly rotates once. When provided as shown in the opening and cut-off St diagram, the pulse will look like the tie 2 chart diagram. Here, the pulses representing the protrusions of the typeface 34 and the positions of each groove of the spline portion 33 are τ・~T11
This is the type position pulse. This type position pulse is a pulse generated during the selection process. The next long pulse Tt4tlL is the reference pulse confirmation pulse. T.
If T is the reference position pulse, it is necessary to always check whether T is the reference position pulse, which means that the reference pulse confirmation pulse of T14 is generated and then Tl
This can be done by determining that the pulse after s is generated is 1 kT.

Next, in order to determine whether the pulse 14 is a reference pulse confirmation pulse or not, it is necessary to differentiate it from each position pulse. Here, 0-order VCT1.
The period from the leading edge of the pulse 'rts to the leading edge of the pulse 'rts is the pulse interval B of the reference pulse confirmation pulse. Assuming that the pulse interval generated by the printer control unit is the reference pulse interval C, the pulse interval generated by the photodetector 84 is compared and determined each time using the relationship: M 0 B.

The condition for the reference position pulse of T14 is the pulse interval A.
, and then there is a pulse interval B. In this embodiment, the reference pulse interval C is designed to be 65 mm %, the pulse interval for each position is less than 40 mm JJ, and the pulse interval Bti of the reference pulse confirmation pulse is designed to be 90 msec or more.

Furthermore, the angular pitch from hole to hole of the detection plate 85 will also be explained. Since the detection plate 85Fi rotates at a constant speed, a taper interval is generated in accordance with the ratio of the angular pitch of the detection plate 85. If the large angle pitch from each position is 0 mm, then the hole interval with a wider angle pitch is θ w. That is, by establishing the relationship θ > σ1, the printer can be controlled while checking the reference pulse T@t1 every printing cycle in accordance with the pulse interval determination method described above. In the present invention, 0m=1t25'.

θm=135@. Here, if the angular pitch from 'rts to TI is 01, then θn = n

In the present invention, the time required for the paper feed windmill 63 to move by one windmill together with the paper feed shaft 68 and the position/position of the detection plate 85 are determined.
(Three angular pitches of the angular pitch θm representing the ruth, that is, 3×0m, are the same.

Among these, only the energization C1 to the paper feed electromagnetic coil 65 - the stratum corneum bit 0m. Therefore, T indicating the reset process section
If the pulse interval of tl, that is, θD, is set to an integer multiple of 0 or more, the mechanical timing and pulse timing of printing paper 6001 line feed and m line feed will be the same, so efficient paper feed production can be obtained. . To feed a load m rows, if the selection process is in progress, energize every pulse.
As shown in the example of the timing chart of the present invention, paper can be fed in five lines. Furthermore, during the reset process, paper can be fed three lines. Furthermore, it is also possible to apply electricity from the reset process to the selection process. By the way, in the case of m-line feeding, intermittent energization or continuous energization may be used as in the example of 5-line feeding. In the present invention, FiljD=67.5'.

As described above, the configuration of the present invention eliminates the need for a mask mechanism as in the conventional configuration, so the number of parts can be reduced compared to the conventional configuration. % and the number of parts for the printer's photodetection device only, the number of mechanical parts is reduced by about half. This makes parts management easier, resulting in significant cost reductions.

Next, comparing the assembly, in the conventional method, the mask t
a111, a drive source is required to move the mask lever 1Sf.In the conventional example, in order to engage the basic gear 16 and move the mask portion of the mask lever 15, the mask lever 13 and the mask attached to the basic gear 16 are connected to the mask lever 1Sf. The lever driving cam 171 must be engaged during assembly, and furthermore, the mask lever spring 1B must be engaged with the mask lever 15.
However, the present invention does not require the above-mentioned assembly operation, and can be assembled much more easily than the conventional method. . Next, when comparing the VCM reliability, according to the method of the present invention, there is a reliability design that takes into account wear at the cam joint between the mask lever 1s and the mask lever drive cam 17 due to the conventional mask mechanism, and a type wheel shaft 7 is designed to be reliable considering the wear of the rotating and sliding parts of the mask lever 15 and the mask lever spring 18, and the spring design ring is designed to take into account the reliability of the mask lever spring 18, which is effective without much design load.

Further, there is no need to test the Mm property of the mask mechanism, and a very high quality photodetection mechanism can be obtained.

As mentioned above, the present invention has achieved improved quality through a reduction in the number of parts, ease of assembly, and further stability of mechanical operation. Furthermore, the present invention can be widely applied not only to a photodetection device for a print wheel selection type printer, but also to printers of different types that require a reference nozzle.

[Brief explanation of drawings]

1 and 2 are a side sectional view and a side view showing a conventional method, in which 1 is a type wheel shaft, 2 is a type wheel, 11 is a detection plate,
12 is a photodetector, 1! I is a mask lever, 16 is a reference gear, 17 is a mask lever drive cam, and 18 is a mask reflex (
+/(ne de al. Figures 3 to 7 are diagrams showing one embodiment of the present invention, in which Figure 3 is a side sectional view, Figure 4 is a side view, and Figures 5 and 6 are diagrams showing an embodiment of the present invention. 7 is a timing chart showing one printing cycle, 51 is a type wheel, 5s is a spline part, 34 is a type mold, 55 is a type wheel shaft, and 39 is an electromagnet. Coil, 54 is a printing roller, 57 is an ink roller, 59 is a paper feed roller, 60 is a printing paper, 69
is a motor, 74 is a reference gear, 75 is a transmission gear, 76 is a driven gear, 8s is a detection plate, 84 is a photodetector, 85 is a light emitting diode, and 86 is a phototransistor. Applicant Chishu Seiki Co., Ltd. Agent Patent Attorney Mogami

Claims (2)

[Claims] (1) A basic gear that rotates once in one printing cycle of a type wheel selection type printer that prints one line in a t-1 printing cycle, and a detection plate that is attached to the basic gear and has the required number of holes on the circumference. and a detector in which a photodetection component is attached at a position synchronized with the hole of the cough detection plate, and the detection 9 has several holes with the same angular pitch and at least one hole with a different angle. A photodetection device for a printer characterized by having holes with a pitch. (2) A type position pulse that corresponds to each type of a type wheel with type letters, symbols, etc. placed on its outer periphery, a position pulse that serves as a reference, and a position pulse that serves as a standard for each print cycle. 2. The photodetecting device for a printer according to claim 1, wherein the reference pulse for confirming the reference pulse and the t% are generated only by the detection plate and the detector.