TW518286B - Method and related apparatus for addressing operations of a printer with single sensor - Google Patents

Abstract

A method and related apparatus for addressing operations of a printer. The printer includes a sensor and a driving wheel for rotating to drive the printer into different states such as initial, paper-feed and printing states. The driving wheel has a rib with a first section and at least a second section corresponding to the different states of the printer. When the driving wheel rotates and the rib passes the sensor, the sensor is capable of sensing the rib to generate a rib sensing signal and sensing the first and the second sections to generate a section sensing signal. The method includes: determining the rotation position of the driving wheel only according to the sensing signal of the sensor.

Description

518286

V. Description of the invention (1) Field of the invention: Method of addressing and related equipment Positioning method of printer operation The present invention provides a printer operation mechanism, especially a device that can be used with a single sensor and related equipment. Background note: 丨 The digital image output device that only captures and processes the image is also available in: nr; jie; FIG. 1c is a side view of the cam 20 in FIG. 1A. See the convenience of the side view of the drive structure of the table name machine 10 without affecting the technical and structural aspects of the present invention. In order to 'part of the mechanical mechanism in the house B has been: in the case, a picture ;, the artist knows' in the printer c is set on the casing 12 to be paper, photo paper or other media c To be controlled iV cam 20,-actuating wheels 16, 2 are provided with-pull: Q 19. The traction wheel 14, the cam 20 and the actuator W, and the _4_ moving wheel 16 are all rotatable; 518286

Set on the body 12. When the printer 彳 (not shown) is rotated by a certain motor 14 in the printer 10. When the traction wheel 14 rotates, it will start-not shown) to drive the traction wheel and then to drive the actuation wheel 16 to rotate. : The cam 20 rotates and protrudes. If the 嫱 1 η is known from μ λα and the actuating wheel 16 is rotated, the work can be carried out. Since the actuating wheel 16 rotates at different angles = the relevant mechanical mechanism of the paper printing 4 performs different operations f. If the closing operation of the printer 10 will be driven at the second production, each of the LLi control printer 10 must be clearly determined Phase M + historical site actuation of the actuation wheel 16. Because of the addressing requirements, the cams 20 for driving the actuating wheels 16 are provided with flanges 18A, yB. With the flange 18 core 18B, the printer 10 is also provided with two sensors, S2 and S2. The sensors S2 and S2 are fixed on the housing 2; usually, the light sensors' are electrically connected to the controller 19. As shown in Fig. 1c, the flanges 1 8 A and i 8B of the cam 20 (partially irrelevant structures have been omitted) are in the shape of an arc and are located on a concentric circle with no radius; the vacant portion of the flange 18A forms a section PG1, the vacancy of flange 18B forms section PG2. When the cam 20 drives the actuating wheel 16 to rotate, the flange 18 A and the segment P G 1 are also driven to pass over the sensor s 1. When the flange 1 8 A passes the sensor S1, the light emitted by the sensor S 1 will be blocked by the flange 1 8 A. At this time, the sensor S1 will generate a corresponding flange induction signal and output it to the controller 1. 9; In contrast, when the segment PG 1 passes the sensor S 丨, the light emitted by the sensor S 1 will not be blocked by the flange 1 8 A. At this time, the sensor s 1 will generate a segment induction correspondingly. The signal is output to the controller 19. Similarly, the sensor S2 will also sense the flange 18B and the segment PG2, and correspondingly generate different flange sensing signals and segment sensing signals' to the controller 19. The controller 19 can analyze the cam based on the sensing signals of the sensors S2 and S2.

518286 V. Description of the invention (3) In the case of 20 ° rotation, the rotation of the actuating wheel 16 can be positioned even with the purpose of controlling the printer's movement. More specifically, the flanges 18 A, 18 B on the cam 20 define edges La, Lb, Lc, respectively; each edge corresponds to a starting position of a specific job. Please refer to Figure 2A to Figure 2c (also refer to Figure 1C). Figures 2A to 2B are the positions of the cam 20 when the printer 10 is performing an initialization operation (that is, preparing a related job before printing is started), a paper feeding operation, and a printing operation. As shown in FIG. 2A, when the cam 20 is rotated and the edge La of the flange 18 A is exactly aligned with the position of the sensor s 丨, the cam 20 can also drive the actuating wheel 16 to allow the printer 丨 〇 to perform Initial job. As shown in FIG. 2B, when the cam 20 rotates so that the edge Lb of the flange 18A corresponds to the position of the sensor S1, the cam 20 can drive the actuating wheel 丨 6 to allow the printer 丨 〇 to perform the paper feeding operation. . Similarly, as shown in FIG. 2C, when the cam 20 rotates and the edge Lc of the flange 18B corresponds to the position of the sensor S2, the cam 2 can also drive the actuating wheel 16 to let the printer 1 0 Perform a print job. In other words, the traction wheels 1 4 (Figure

A ^ ^ ...... ~ "β) Turning 'and driving the actuation wheel through the cam 20 丨 6, the printer 丨 〇 can perform different jobs, and finally complete the entire printing process (including the initial job, feed Paper job t I: printing job). In order to control the action of each job, the controller 1 9 | uses the sensor to detect the cam 20, the upper flange 18Α, ι8β, and the section / 1, PG2. The mutual conversion is analyzed to analyze the rotation of the cam 20, the rotation of the addressing actuation wheel 16 and the various operations performed by the printer 10.

518286 V. Description of Invention (4) Homework. In addition to addressing related jobs during the operation of the printer 10, the printer 10 also needs to be able to return the cam 20 to the original job position (the situation shown in Figure 2A). During the operation of the printer 10, the operation may be interrupted due to power interruption, user error or human interruption, etc., and the position of the cam 20 also stops at an unknown position. When the operation of the cam 20 is stopped and the rotation is stopped, it is likely to be like the example shown in C. At this time, the edges La, Lb, and Lc do not correspond to the positions of the sensors S2 and S2. When the printer 10 starts to operate again after being interrupted, it is necessary to first drive the cam 20 to a specific position (usually to rotate the cam 20 to the initial operation position, as shown in Figure 2A Location) in order to follow up normally. The conventional printer 10 uses two sensors S1 and S1 to sense the flange 18A, the segment PG1 and the flange 18B, and the segment PG2 alternately pass the sensors, and the controller 2 controls the cam 2 0 turns to address to the situation shown in Figure 2A. In the conventional printer 10, each sensor corresponds to only a single flange and section. To locate the position of the cam 20 in the three operations shown in Figures A, B and C, it is necessary to use two. Only the sensing signal provided by the sensor can be used to analyze the position where the cam 20 rotates. As a result, the cost of manufacturing and manufacturing the conventional printer 10 will increase. However, as long as one of the two sensors in the printer 10 is faulty, the addressing cam 20 cannot rotate, and the printer 10 cannot operate normally. This also increases the maintenance cost of the conventional printer 10, which fails to improve the printer's availability.

518286 ________ —- -------— 5. Description of the invention (5) Summary of the invention · Therefore, the main purpose of the present invention is to provide a printer and related method that can address the cam rotation situation with only a single sensor. To address the shortcomings of conventional techniques. Detailed description of the invention: Please refer to FIG. 3A and FIG. 3β. FIG. 3A is a schematic diagram of a related driving structure in the printer 30 of the present invention; FIG. 3B is a schematic side view of the driving structure of the printer 30. Similar to the configuration of the conventional printer 丨 〇, the printer 30 of the present invention is also provided with a controller 39 for controlling the printer 30, and a traction wheel 34, a cam 40, and an actuator 36. Are respectively rotatably arranged on the casing M of the printer 30. The printer 30 will drive the traction wheel 34 to rotate, and further drive the cam 40 to rotate; and the arc-shaped rim 41 of the cam 40 will be actuated to act as a 3 6 'to make the printer 3 〇 Capable of different operations. Different from the conventional printer 10, the printer 30 of the present invention is only provided with a single sensor S 'fixed on the housing 12; the controller 39 receives the sensor S signal, and then It can analyze the rotation of the cam 40, and then address the operation of the printer 30. Although the embodiment in FIGS. 3A and 3b uses the rim 41 specially designed by the cam 40 to drive the actuator 36 and drives the printer 30 to perform different operations, the cam in the present invention may also be As in Figure 1A, the gear meshing is used to drive the actuation wheel and drive the printer. Further, the point of the present invention is how to precisely determine with a single sensor S

518286 V. Description of the invention (6) The situation where the address cam 40 rotates; as for how the cam 40 drives the printer 30 to perform various operations, there can be many different designs; without affecting the technical disclosure of the present invention, The following will focus on the technology of the sensor S addressing the cam 40. Similar to the configuration of the conventional technology, the cam 40 is also provided with a flange 38 to cooperate with the sensor S to sense the rotation of the cam 40; please continue to refer to FIGS. 3C and 3D. Fig. 3C is a schematic diagram of the external view of the cam 40 in the present invention, and Fig. 3D is a schematic diagram of the side view of the cam 40 (for clarity of the illustration, some structures not related to technical disclosure have been appropriately omitted). Different from the conventional technology, as shown in FIG. 3D, the flanges 38 on the cam 40 of the present invention are distributed in a circular arc of equal radius, and the center of rotation 0 of the cam 40 is rotated; In the example, the three operations (initial operation, paper feeding operation, and printing operation) of the printer 30 are provided with two vacancies on the flange 38 to form sections G1, G2, and G3. Segment G1 is the first segment and presents an angle of A1 with circle center 0; segment G2 is the second segment and presents an angle of circle A2 with circle center 0; segment G3 is the third segment and presents A3 at circle center 0 Angle. The included angle A1 is greater than the included angles A2 and A3. In a preferred embodiment, the included angle A2 is equal to the included angle A3. Segments G1 to G3 define edges P 1 to P 3 respectively, which correspond to the three jobs of printer 30. When the cam 40 rotates, when the flange 38 passes the sensor S, the sensor can send out a flange induction signal; when the vacant sections G 2 and G 3 pass the sensor S, the sensor S It can send a segment of induction signal. The controller 39 can control the addressing of the cam 40 according to the different flange induction signals and section induction signals of the sensor S.

Page 10 518286 V. Description of the invention (7) Please refer to Figure 4A to Figure 4C. Figures 4A to 4C are schematic diagrams of the rotation positions of the cams when the cam 40 drives the printer 30 to perform initial operations, paper feeding operations, and printing operations, respectively. As shown in FIG. 4A, when the edge P1 faces the position of the sensor S, the cam 40 drives the printer 30 to enter the initial operation. Similarly, as shown in FIG. 4B, when the edge P 2 is facing the position of the sensor S, the cam 40 can drive the printer to perform the paper feeding operation. As shown in Fig. 4C, when the edge P 3 is facing the position of the sensor S, the cam 40 can drive the printer to perform a printing job. As discussed earlier, one of the important actions of the printer is to be able to turn the cam back to the original job state (the situation in Figure 4A) so that it can continue normal when printing resumes after it is interrupted Follow-up operations. When the operation of the printer 30 is interrupted for some reason, the cam 40 will stop at an unknown position; when the printer 30 is to restart operation, it must first drive the cam according to the sensing result of the sensor S 40 turns to the initial working state to drive the printer 30 to start working again from the initial state. In order to control the rotation of the cam 40 to the position of the initial operation in FIG. 4A according to the sensing signal of the single sensor S, a special process is also designed in the present invention. Please refer to Figure 5. FIG. 5 is a flowchart of a process 100 for turning the cam 40 back to the initial working position in the present invention. In actual implementation, the process 100 may be performed in a state machine manner, and progressed to different states as each step proceeds. The process 100 in FIG. 5 includes the following steps: Step 102: Start. To return the cam 40 to the initial operating position in Figure 4A

Page 11 518286 V. Description of the invention (8) When the time is set, the process 1 0 0 can be performed. Step 104: Determine the steps to be performed according to the sensing signal of the sensor S. If the sensing signal of the sensor S is a flange sensing signal (that is, the flange 38 is turned to the position of the sensor S), proceed to step 1 10; if the sensor S sends a segment sensing signal (that is, The segments G and G 2 or G 3 are turned to the position of the sensor S), then proceed to step 106. Step 106: The cam 40 is rotated counterclockwise (CCW). Step 108: In step 106, when the cam 40 is rotated counterclockwise, continuously check whether the sensing signal of the sensor has changed. If the sensing signal is always a segment sensing signal, continue to check subsequent sensing signals until the sensing signal turns into a flange sensing signal, then proceed to step 110. In actual implementation, a specific high-frequency clock can be used to periodically check whether the sensing signal has changed when the cam 40 rotates. Step 110: Rotate the cam 40 clockwise (CW). Step 1 12: Continuously check the condition of the induction signal during the rotation of the cam 40. If the sensing signal is a flange sensing signal, continue to check subsequent sensing signals until the sensing signal of the sensor changes to a segment sensing signal, then proceed to step 1 1 4. Step 1 1 4: Set a preset angle A 0. The preset angle A 0 is larger than the included angles A2 and A3 of the segments G2 and G3, but smaller than the included angle A of the segment G1. Step 1 6: Turn the cam 40 clockwise; and when the cam 40 rotates, the accumulation starts The angle by which the cam 40 has rotated after this step. Step 1 1 8: When the cam 40 rotates clockwise, check that the cam 40 has rotated

518286 V. Explanation of invention (9). If the rotation angle of the cam 4 0 after step 1 16 is not greater than the preset angle A 0, proceed to step 1 2 4; if yes, proceed to step 120 °. Step 1 2 0: Invert the cam 4 0 The clock rotates. Step 12: During the counterclockwise rotation of the cam 40, continuously check the induction signal from the sensor. If the sensing signal is a segment sensing signal, then the performance check is performed on subsequent sensing signals until the sensing signal changes from the segment sensing signal to the flange sensing signal, and then proceed to step 130.

Step 1 2 4: Check the induction signal. If the sensing signal is a segment sensing signal, then proceed to step 1 16; if the sensing signal is a flange sensing signal, proceed to step 126 °. Step 1 2 6: Turn the cam 40 clockwise. Step 128: During the clockwise rotation of the cam 40, the induction signal is continuously checked. If the sensing signal is a flange sensing signal, the subsequent sensing signals are continuously checked until the sensing signal is converted into a segment sensing signal, and then proceed to step 114. Step 13: Go to this step, which means that the cam 40 has been rotated to the position of the initial job (that is, the position in Fig. 4A). You can end the process at 100 °

In order to more specifically describe the situation in which the process 100 is performed, several cases are now given to explain it practically. Please refer to FIG. 6A to FIG. 6D first. Figures 6A to 6D are schematic diagrams of the process of turning the cam 40 to the initial working position during the process 100. Assume that at the beginning of process 100, the position of cam 40 is as shown in Fig. 6A.

Page 13 518286 V. Description of the invention (ίο); that is, the flange of the cam 40 is stopped at the position of the sensor S. At this time, step 104 detects that the sensor S sends a flange induction signal. In step 110, the controller 39 (see Fig. 3A) controls the actuation wheel 3 6 to drive the cam 40 to rotate clockwise ( (Shown in the direction indicated by arrow CW in FIG. 6A); step 11 2 also continues to check the induction signal until the cam 40 rotates to the position in FIG. 6B, so that the induction signal becomes a segment induction signal. Then proceed to step 1 1 4 and step 1 1 6 and start to rotate the cam 40 clockwise (as shown by the arrow CW in FIG. 6B); during the rotation of the cam 40, the process 1 0 0 will Always cycle through steps 1 2 4, steps 1 1 6 and steps 1 1 8. As shown in FIG. 6B, the included angle A1 of the segment G1 is actually larger than the preset angle A0, so when the cam 40 rotates clockwise from the position in FIG. 6B, the sensor S will always send out a segment induction signal. 1 0 0 has also been cyclically performed between steps 11 8, 1 2 4 and 116, until the cumulative rotation of the cam 40 in step 1 8 has reached the preset angle A0 (as shown in FIG. 6C). To proceed to step 1 2 0. When the cam 40 is rotated from the position in FIG. 6B by the preset angle A0 and reaches the position in FIG. 6C, step 1 2 0 will cause the cam 40 to rotate in the opposite direction (that is, counterclockwise, as shown by the arrow CCW in FIG. 6C) Direction), and in step 122, continuously check the induction signal of the sensor S until the induction signal is changed from the segment induction signal to the flange induction signal, and the cam 40 can be rotated to the initial operation position, as shown in Figure 6. D (that is, Figure 4A) does not. In this way, the purpose of turning the cam 40 to the initial working position in the process 100 is achieved. Please continue to refer to FIGS. 7A to 7D. Figures 7A to 7D show the process of turning the cam 40 back to the initial working position in another case.

Page 14 518286 V. Description of the invention (11) Figure. Assume that when the process 100 starts, the position of the cam 40 is shown in Figure 7A. After the process 100 starts to operate, it will go from step 104 to step 110 (because the sensor S in FIG. 7A senses the flange), and make the cam 40 rotate clockwise. At the same time, steps 1 1 2 also continuously check the change of the sensing signal until the sensing signal changes from the flange sensing signal to the segment sensing signal, as shown in Figure 7B. In FIG. 7B, the sensing signal of the sensor S is just changed from the flange sensing signal to the segment sensing signal (because the segment G2 is encountered), the preset angle A0 is set in step 114, and the starting of The cam 40 rotates clockwise, and at the same time starts to accumulate the rotation angle. Please note that, as mentioned above, the included angle A 2 of the segment G 2 is smaller than the preset angle A 0. When the cam 40 starts to rotate clockwise from the position of FIG. 7B, it will proceed from step 1 1 to step 1 2 4 and then return to step 1 16 until the sensing signal detected in step 1 2 4 is the segment sensing signal. It turns into a flange sensing signal, and at this time, the cam 40 is rotated to the position shown in FIG. 7C (that is, clockwise from one edge of the segment G 2 to the other edge). In other words, after the clock of cam 40 starts clockwise in step 114, its rotation angle has not exceeded the preset angle A0, and the sensing signal has been changed from the zone sensing signal to the flange sensing signal; this is because the zone The reason that the included angle A 2 of the segment G 2 is smaller than the preset angle A 0. At the position of FIG. 7C, the process 1 0 0 will proceed from step 1 2 4 to step 1 2 6 because the sensor S senses the flange, so that the cam 4 0 continues to rotate clockwise until the induction signal again from the flange The sensing signal is changed to a segment sensing signal, and then proceeds to step 1 1 4 again. That is to say, the cam 40 is rotated clockwise from FIG. 7C to rotate to the position of FIG. 7D; and then continues to rotate from the position of FIG. 7D until the sensor S meets the next segment (that is, the segment G 1), and will repeat the steps again

Page 15 518286 V. Description of the invention (12) 1 1 4 The subsequent control steps will be the same as the control steps in Figure 6B to Figure 6D. Finally, the cam 40 will be rotated to the initial operating position in Figure 4A (that is, Figure 6D) to achieve the purpose of flow 100 0 control. . Please refer to Figure 8A and 8B again. Figures 8A and 8B are schematic diagrams of the control process of the process 100 in another situation. Assume that at the beginning of the process 100, the position of the cam 40 is shown in Fig. 8A, and the segment G 1 stays at the position of the sensor S. After the process 100 is performed, the sensor S will detect To the segment and generate the segment induction signal, and from step 104 to step 106, the cam 40 is rotated counterclockwise, and the induction signal is continuously checked during the rotation until the induction signal from the segment induction signal It turns into a flange sensing signal, and at this time, the cam 40 is rotated to the position shown in FIG. 8B. Next, the process 1 0 0 proceeds to step 1 1 0. Please note that FIG. 8B is actually the same as FIG. 6B; in other words, the control steps performed by process 1 0 0 after FIG. 8B are the same as those in FIG. 6 The control steps from B to FIG. 6D are the same. Finally, the cam 40 is rotated to the initial operation position. In addition, please refer to Figure 9A and 9B. Figures 9A and 9B are schematic diagrams of the process of controlling the rotation of the cam under another condition. Similar to the situation in FIG. 8A, suppose that at the beginning of the process 100, the cam 40 stays at the position shown in FIG. 9A (that is, the segment G 2 stays at the position of the sensor S); the process 1 0 0 also rotates the cam 40 to the position shown in FIG. 9B through steps 104, 106, 108. The subsequent steps will be the same as those performed in Figure 7B to Figure 7D (plus Figure 6B to Figure 6D). In the end, the cam 40 can be rotated to the initial operation position (that is, Figure 4A). Shown position

Page 16 518286 V. Description of the invention (13) In summary, after turning the cam 40 clockwise in the process 100, when the sensing signal of the sensor S changes from the flange sensing signal to the segment sensing signal, Indicates that the sensor S has encountered a segment. At this time, the cam 40 will rotate clockwise again by a preset angle A 0 to further confirm whether this section is the first section G with a larger included angle. Because the included angles A2 and A3 of the sections G2 and G3 are smaller than the preset The angle A 0, the cam 40 has not yet rotated through the entire preset angle A 0, will span the entire segment, and the sensing signal is changed from the segment sensing signal to the flange sensing signal. At this time, the process 100 will continue to make the cam 40 rotate clockwise until it encounters the next segment again. On the other hand, if the segment encountered by induction is the first segment G 1 with a large included angle, even if the cam 40 rotates a full preset angle A0, the sensor S still encounters the segment. It can be determined that the cam 40 has been rotated to the segment G 1; since the edge P 1 of the segment G 1 corresponds to the initial operation position, then as long as the cam 40 is rotated in the reverse direction (counterclockwise), the cam 40 is rotated By returning to the edge of the first section G1, the cam 40 can be rotated back to the initial operation position. In other words, the present invention maps the position of the initial job to a section with an included angle A1, and the positions of other jobs (such as paper feeding and printing jobs) correspond to the sections with an included angle A2 and A3; and then uses the included angle A1 The relationship between the preset angle A0 and the included angles A2 and A3 is different, so as to address the position of the cam 40 with a single sensor S. In this way, no matter where the position of the cam 40 is interrupted, the present invention can return the cam 40 to the initial operation position by using the flow 100. In addition to the above process of addressing the cam 40 to the initial working position 1 0 0

Page 17 518286

5. Description of the invention (14) In addition, the present invention can also address the cam 40 to the position of the paper feeding operation and the printing operation by relying on a single sensor S. After the cam 40 has been fixed to the initial operation position by the process 100, according to the actual operation requirements of the printer 30, it must be possible to separate the cam 40 from the initial operation position (shown in Figure 4A). Position) to the paper feed operation position (the position shown in Figure 4B), from the paper feed operation position to the print operation position (the position shown in Figure 4C), from the print operation position to the paper feed operation position, Return to the initial work position from the paper feed work position. Refer to the flowchart of FIG. 10 (refer to FIG. 4A to FIG. 4c together). The flow of 200 in Fig. 10 can control the cam 40 to achieve the above-mentioned four purposes of switching between various operating positions. The process 2 0 0 has the following steps: Step 2 0 2: Start the control cam 4 0 to switch between the various work positions to drive the printer 3 0 to make the corresponding job. To rotate the cam 40 from the initial work position to the paper feed work position, or from the paper feed work position to the print work position, the cam 40 must be rotated counterclockwise. In contrast, to rotate the cam 40 from the paper feeding operation position to the initial operation position, or from the printing operation position to the feeding operation position, the cam 40 must be rotated clockwise. Step 2 04: After turning the cam 40 in step 202, check whether the cumulative rotation angle is greater than the preset angle A. If it is not greater than the preset angle, continue to check the cumulative rotation angle until the cam 40 is in step After the angle of rotation after 202 has been greater than the preset angle A 0 ′, the process proceeds to step 2 06. Step 2 〇 6: Check the induction signal. Under normal circumstances, 'whether the cam 40 is at the position of Fig. 4A, 4B, or 4C at the beginning of step 202', after rotating the preset angle A0 in step 204, the sensor S should encounter the flange. If the sensing signal is indeed a flange ’, then proceed to step 2 10. If the sensing signal 518286 V. Invention Description (15) is a segment sensing signal, proceed to step 208. Step 208: To this step indicates that there is an error in the process, and corresponding error handling can be performed, such as prompting the user and so on. Step 2 1 0: When the cam 40 rotates, continuously check the sensing signal 2 1 0. If the sensing signal is a flange, continue to check the sensing signal until the sensing signal turns into a segment sensing signal, then proceed to step 2 1 2.

Step 2 1 2: Check the previous job. When the process 2 00 is executed, the cam 40 is rotated from one work position to another work position. If the cam 40 is originally in the initial operating position, proceed to step 2 1 4; if the cam 40 is not originally in the initial operating position, proceed to step 2 1 8. Step 2 1 4: Continue to check the sensor signal during the rotation of the cam 40 until the sensor signal changes from the zone sensor signal to the flange sensor signal, and then proceed to step 2 1 6. Step 2 1 6: Reach the position of the paper feeding operation (that is, the position shown in Figure 4B). Step 2 1 8: Check the previous work position. If at the beginning of step 202, the cam 40 is at the position of the paper feeding operation, proceed to step 2 2 0; if not, proceed to step 2 2 2.

Step 2 2 0: Check the direction of cam rotation since step 2 2. If it is clockwise, go to step 2 2 6; if it is clockwise, go to step 2 24. Step 2 22: The cam 40 rotates to the position of the paper feeding operation (as shown in Figure 4B) ° Step 224: the cam 40 rotates to the position of the initial operation (as shown in Figure 4A)

Page 19 518286 V. Description of the invention (16) Step 2 2 6: The cam 40 rotates to reach the position of the printing operation (as shown in Figure 4C and Figures 4A to 4C, which can further explain the process of 2 0 0 First, when the cam 40 is to be rotated from the initial operation position (Figure 4A) to the paper feeding position (Figure 4B), step 2 0 2 will set the cam 40 to rotate counterclockwise, and after step 2 0 4, 2 0 6, 2 1 0 Turn to an edge of section G 2; Step 2 1 2 will determine that the previous work position is indeed the initial work position, proceed to Step 2 1 4 and continue to rotate until the sensor S crosses After the entire section G 2 reaches the edge P 2 of the section G 2, the cam 40 is rotated to the position of the paper feeding operation and stops at step 2 16. If the cam 40 is to be rotated from the position of the paper feeding operation To the position of the print job (the position shown in Fig. 4C), the flow 2 0 0 is also set in step 20 2 to rotate the cam 4 0 counterclockwise, and through steps 204, 206, 2 1 0 (turn to the edge P 3) Go to step 2 1 2 again; since the position of cam 40 at the beginning of step 2 2 is the position of the paper feeding operation, not the position of the initial operation Therefore, proceed from step 2 1 2 to step 2 1 8 and then from step 2 1 8 to step 2 2 0. Because the rotation direction set in step 2 2 is counterclockwise, proceed from step 2 2 0 to step 2 2 4, the process 2 0 0 can be judged in step 2 2 4 at this time the cam 4 0 has been rotated to the position of the print job in Figure 4C. Similarly, when the cam 4 0 is to be returned to the paper feed from the position of the print job The position of the job. In the flow 2 0 0, the cam 40 is set to rotate clockwise through steps 204, 206, 210 to step 212; because the position of the cam 40 at step 20 2 is the position of the print job, So the process 2 0 0 will proceed to step 2 1 8

Page 20 518286 V. Description of the invention (17) Go to step 2 2 2. At this time, the process 2 0 0 will judge that the cam 4 0 has been turned to the position of paper feeding operation. Finally, when the cam 40 is to be fed from the paper feed job to the initial job position, step 2 0 2 will be set to rotate the cam 4 0 clockwise, across the section G 2 and by step 2 10 The edge P 1 of the segment G 1; proceed to step 2 1 8 and then step 2 2 0 after the judgment of step 2 1 2, and proceed to step 2 2 6 because the rotation direction set in step 2 2 is clockwise, The process 2 0 0 can determine that the cam 4 0 has been rotated to the initial operation position at this time. In a word, as long as the sensor signal from a single sensor is used, the process 200 can allow the cam 40 to switch between different operating positions to drive the printer 30 to complete the necessary initial, paper feeding, and printing operations. In a word, in the printer of the present invention, only a single sensor S is required to match the segment on the cam 40, and the positions of the rotation of the cam 40 can be addressed using the processes 100 and 200. Please note that in the above discussion, the cam 40 has three sections corresponding to three different printer operating positions; if the printer is to perform more different jobs (that is, the cams are to be located in more different positions) ), More corresponding sections can also be set on the cam. In accordance with the various operations to be performed by the printer, each job will have a corresponding section on the cam; the section corresponding to the initial operation is set to an angle of A1; the section corresponding to other operations can be uniformly set to A 2. With the preset angle A 0 between the included angles A 1 and A 2, the cam can be located at the initial operation position by using the process 1 0 0. To switch between working positions, you can use the principles taught in Process 200.

518286 V. Description of the invention (18) In the conventional technology, the cam that drives the printer's operation requires two sensors to locate the position of the cam rotation, which will increase the time and cost of conventional printer production, manufacturing and maintenance. . In contrast, the present invention only needs to be provided with a single sensor, which can address the rotational position of the cam, and can accurately control the printer's actions under the conditions of low cost and high reliability, and exert the advantages of the printer. Function; and the spirit of the present invention can be widely applied to thermal transfer type, thermal induction type, striker type, inkjet type, electrostatic type printer.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of the patent application for the present invention shall fall within the scope of the invention patent.

Page 22 518286 Brief description of the drawings Brief description of the drawings: Figure 1 A is a schematic diagram of the structure of a conventional printer. Figure 1B is a side view of the printer in Figure 1A. FIG. 1C is a side view of the cam in FIG. 1A. Figures 2A to 2C are schematic diagrams of the rotation positions of the cam wheels of the printer in Figure 1A during different operations. FIG. 3A is a schematic structural diagram of a printer according to the present invention. FIG. 3B is a side view of the printer in FIG. 3A. FIG. 3C is a schematic diagram of the cam in FIG. 3A. FIG. 3D is a side view of the cam in FIG. 3C. Figures 4A to 4C are schematic diagrams of the rotation positions of the cams in Figure 3A during different operations. Fig. 5 is a control flow chart for returning the cam to the situation in Fig. 4A according to the present invention. FIG. 6A to FIG. 6D are the processes of the flow chart in FIG. 4 and the control example is not intended. 7A to 7D are schematic process diagrams of another control example of the process of FIG. 4. FIG. 8A and FIG. 8B are process schematic diagrams of the third control example of the process in FIG. FIG. 9A and 9B are process schematic diagrams of the fourth control example of the process in FIG. Fig. 10 is a schematic diagram of a control process for controlling the rotation of the cam between various working positions according to the present invention. Schematic symbol description:

518286 Schematic description

120 210 10, 30 Printer 12 ^ 32 Housing 14, 34 Traction wheel 16 Actuating wheel 18A, 18B, 38 Flange 19 > 39 Controller 20, 40 Cam 36 Actuator 41 Flange 100 > 200 Flow La- Lc, P1-P3 edge PG1-PG2 'G1-G3 segment Sb S2, S sensor 0 circle center AO preset angle A1-A3 angle 102, 104, 106 ^ 1 0 8, 11 0, 112, 114, 116 , 118, 122, 124, 126, 128, 130, 2 0 2 ^ 20 [2 0 6 to 2 0 8 to 212, 214, 216, 218, 220, 222, 224, 226 Step Page 24

Claims (1)

518286 6. Scope of patent application 1. A method for controlling a printer, the printer includes: a casing; a cam is arranged on the casing in a manner rotatable along a circle center, and the cam surrounds the A flange is provided on the circumference of the circle center, and the flange is provided with a first section and a second section. The first section corresponds to the circle center at a first angle, and the second section corresponds to the circle center. Two included angles; wherein when the cam rotates to different angles corresponding to the housing, it will drive the printer to perform different operations; and a sensor fixed in the housing corresponding to the position of the flange of the cam; When the cam rotates, it will drive the flange to pass over the sensor; when the flange passes over the sensor, the sensor will generate a flange induction signal; and when the first section and the second section When the segment passes over the sensor, the sensor generates a segment induction signal; and the method includes: when the signal generated by the sensor changes from a flange induction signal to a segment induction signal, the cam is rotated A preset angle And after the cam is rotated the predetermined angle, only in accordance with the signal generated by the sensor to determine the angle of the cam with respect to the housing; wherein the predetermined angle is between the first angle and the second angle. 2. If the method of applying for item 1 of the patent scope includes: 518286 6. Scope of patent application If the signal generated by the sensor after the cam rotates the preset angle is the section induction signal, the cam is rotated in the reverse direction until the signal generated by the cam is converted into the flange induction signal . 3. If the method of claim 1 of the patent application scope further includes: If the signal generated by the sensor after the cam rotates the preset angle is the flange induction signal, continue to rotate the cam until the cam The generated signal is changed to the induction signal of the segment. 4. The method according to item 1 of the patent application, wherein the first included angle is greater than the second included angle. 5. The method according to item 1 of the patent application scope, wherein the cam further includes a third section, and the third section corresponds to a circle center at a third included angle; wherein the third included angle is smaller than the preset angle. 6. The method according to item 1 of the patent application scope, wherein the sensor is a light sensor. 7. The method according to item 1 of the scope of patent application, wherein when the cam rotates to drive the first section to pass over the sensor, the cam system drives the printer to perform an initialization operation. 8. The method of claim 1 in the patent application range, wherein when the cam rotates, Page 26 518286 6. Scope of patent application When the second section is driven past the sensor, the cam system drives the printer to perform a paper feeding operation. 9. The method according to item 1 of the patent application, wherein when the cam rotates to drive the second section to pass through the sensor, the cam system drives the printer to perform a printing operation. 10. —Printer, comprising: a housing; a cam provided on the housing so as to be rotatable along a circle center, the cam is provided with a flange around the circumference of the circle center, and the flange is provided with There is a first section and a second section; the first section corresponds to the center of the circle at a first angle, and the second section corresponds to the center of the circle at a second angle; when the cam rotates to correspond to the housing When the angle is different, it will drive the printer to perform different operations; an sensor is fixed in the housing corresponding to the position of the flange of the cam; wherein when the cam rotates, it will drive the flange to pass over the flange Sensor; when the flange passes over the sensor, the sensor will generate a flange induction signal; and when the first section and the second section pass through the sensor, the sensor will generate A section induction signal; and a controller for controlling the rotation of the cam according to a signal generated by the sensor; wherein when the signal generated by the sensor changes from a flange induction signal to a section Page 27 518286 6. When applying for a patent range sensing signal, the controller will rotate the cam by a preset angle, and judge the angle of the cam relative to the housing only based on the signal generated by the sensor; The predetermined angle is between the first included angle and the second included angle. 1 1. If the printer of the 10th patent application scope, if the signal generated by the sensor after the cam rotates the preset angle is the sensor signal of the section, the controller will reverse the cam Turn until the signal generated by the cam changes to the flange sensing signal. 1 2. If the printer of the 10th patent application scope, if the cam rotates the preset angle, the signal generated by the sensor is the flange induction signal, the controller will continue to make the cam rotate Until the signal generated by the cam is changed to the induction signal of the segment. 1 3. The printer according to item 10 of the patent application scope, wherein the first included angle is greater than the brother Yishuang angle. 14. The printer according to item 10 of the patent application scope, wherein the cam further includes a third section, and the third section corresponds to a circle center with a third included angle; wherein the third included angle is smaller than the Set the angle. 1 5. The printer as claimed in item 10 of the patent application scope, wherein the sensor is light Page 28 518286 VI. Patent Application Range Sensor. 16. The printer of claim 10, wherein when the cam rotates to drive the first section past the sensor, the cam drives the printer to perform an initialization operation. 1 7. The printer of claim 10, wherein when the cam rotates to drive the second section to pass through the sensor, the cam drives the printer to perform a paper feeding operation. 1 8. The printer of claim 10, wherein when the cam rotates to drive the second section to pass through the sensor, the cam drives the printer to perform a printing operation. Page 29