CN109435482B - Automatic positioning printing head structure and sensor self-checking method using same - Google Patents
Automatic positioning printing head structure and sensor self-checking method using same Download PDFInfo
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- CN109435482B CN109435482B CN201811623939.8A CN201811623939A CN109435482B CN 109435482 B CN109435482 B CN 109435482B CN 201811623939 A CN201811623939 A CN 201811623939A CN 109435482 B CN109435482 B CN 109435482B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/325—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J25/304—Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
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- Accessory Devices And Overall Control Thereof (AREA)
- Character Spaces And Line Spaces In Printers (AREA)
Abstract
The invention relates to an automatic positioning printing head structure and a sensor self-checking method using the same. The automatic positioning printing head structure comprises a first sensor, a second sensor, a third sensor, a first limiting block and a second limiting block, wherein the printing head moving assembly is connected with the frame and moves relative to the frame; the side wall of the printing head moving assembly is sequentially connected with a first sensor, a second sensor and a third sensor from top to bottom; the first limiting block is connected with the frame and used for triggering the first sensor and/or the second sensor; the second limiting block is connected with the frame and used for triggering the third sensor. The three working positions of the limit protection position, the cleaning position and the reset position of the printing head can be detected by adopting the three sensors and the two limiting blocks, the positioning is performed without calculating the movement distance, the positioning is accurate and reliable, and the problem that the sensor fails to be positioned when one sensor is adopted is avoided. The sensor self-checking method realizes the sensor self-checking and avoids the false work of the printing head moving assembly after the sensor fails.
Description
Technical Field
The invention relates to the field of printers, in particular to an automatic positioning printing head structure and a sensor self-checking method using the same.
Background
The thermal transfer technology is a product of a combination of heat transfer principles and hot stamping (hotstamp) technology, and among thermal transfer bar code printers manufactured according to this technology, the most common is a "melt" thermal transfer printer. It is the most commonly used industrial printer, which uses a polyester film as the base band of the ribbon, and coats the surface with a waxy solid ink. When printing, the microprocessor controls the heating body in the thermal (sensitive) printing head to heat, so that the hot-melt ink layer on the film color belt is melted, and then transferred to the plain paper to generate the pattern which can be kept for a long time. Because the film ribbon overcomes the network structure of the ribbon of the fabric commonly used in the dot matrix printer, the printed graph has a solid feel and is much like a printed matter. Thermal transfer printing is the process of transferring ink from a carbon tape medium to paper or film using heat and pressure, and transferring the ink to the paper as it passes through the print head and platen of the printer.
In a thermal transfer printer, the positioning of the print head plays a very important role, and the print head moves up and down to realize the conversion of four stations in the working process of the printer. The print head is a limit protection position when moving to the uppermost part; the printing head moves downwards to a cleaning position for cleaning and maintaining the printing head; the printing head moves downwards to a reset position, the printer is in a standby state, and the color ribbon can be replaced; the printhead continues to move downward to the depressed position and the printhead begins printing. The current print head positioning adopts an optical sensor positioning method, and only the cleaning position can be positioned. The distance of each step needs to be calculated to determine during the downward movement of the print head. When the sensor fails, the specific position of the printhead cannot be determined, which is a great nuisance to the printing process.
Disclosure of Invention
The invention aims to solve the technical problems of accurately positioning a plurality of stations of a printing head and detecting whether a sensor is faulty or not.
The technical scheme for solving the technical problems is as follows: the automatic positioning printing head structure comprises a printing head moving assembly and a frame, wherein the printing head moving assembly is connected with the frame and moves relative to the frame; the side wall of the printing head moving assembly is sequentially connected with the first sensor, the second sensor and the third sensor from top to bottom; the first limiting block is connected with the rack and used for triggering the first sensor and/or the second sensor; the second limiting block is connected with the frame and used for triggering the third sensor.
The beneficial effects of the invention are as follows: the first sensor and the second sensor are in limit protection positions when contacting the first limiting block; only the first sensor is in contact with the first limiting block to form a cleaning position; the third sensor is a reset position when contacting with the second limiting block, namely a standby position of the printer. Three working positions of the printing head can be detected by adopting three sensors and two limiting blocks, positioning is not needed by calculating the movement distance, and positioning is accurate and reliable. The problem that the sensor fails and cannot be positioned when one sensor is adopted can be avoided.
Specifically, the first sensor, the second sensor and the third sensor are respectively and electrically connected with a controller of the printer, the controller is electrically connected with the motor, the controller sends out instructions to control the motor to rotate after receiving signals of the sensors, and the motor drives the printing head moving assembly to move.
Specifically, the first sensor, the second sensor and the third sensor can be micro-motion sensors with the model of SS-5GL2 or micro-motion sensors with other models.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the printer head moving support comprises a pressure sensor, wherein the printer head moving support is provided with an upper fixing portion and a lower fixing portion which are protruded outwards, the top surface of the pressure sensor is connected with the bottom surface of the fixing portion, and the bottom surface of the pressure sensor is connected with the lower fixing portion.
The beneficial effects of adopting the further scheme are as follows: the printing head moves downwards after moving to the reset position, the pressure sensor collects the pressure born by the printing head, and when the pressure reaches a set value, the printing head is positioned at the pressing position, namely the printing position of the printing head. The three sensors and the pressure sensor are adopted to detect four stations of the printing head, and the positioning is accurate and reliable.
Specifically, the pressure sensor can be an S-shaped pull pressure sensor with a model DBBW or other pressure sensors.
Specifically, the printing head comprises two pressure sensors, wherein the two pressure sensors are fixedly connected with the left side and the right side of the printing head moving support.
Specifically, the pressure sensor is electrically connected to a controller of the printer.
Further, the distance between the first limiting block bottom surface and the second limiting block top surface is greater than the distance between the first sensor top surface and the third sensor bottom surface.
The beneficial effects of adopting the further scheme are as follows: the first limiting block and the second limiting block can not trigger the sensor at the same time, so that the normal work of the printing head is ensured.
Further, the first limiting block is provided with a triggering surface for triggering the first sensor and/or the second sensor, and the height of the triggering surface is larger than the distance between the top surface of the first sensor and the bottom surface of the second sensor.
The beneficial effects of adopting the further scheme are as follows: the first limiting block can only trigger the first sensor, and can also trigger the first sensor and the second sensor simultaneously, so that the determination of two working positions is realized.
Further, a transition inclined plane is arranged between the trigger surface and the bottom surface of the first limiting block, the transition inclined plane is obliquely arranged, and the included angle between the transition inclined plane and the trigger surface is 100-170 degrees.
The beneficial effects of adopting the further scheme are as follows: the first limiting block is provided with a transition inclined plane to avoid direct collision damage with the sensor.
Further, the second limiting block is provided with a trigger point for triggering the third sensor, and the distance between the lower end of the trigger surface and the trigger point is larger than the distance between the top surface of the first sensor and the bottom surface of the third sensor.
The further scheme has the beneficial effects that the second limiting block is a triangular block, one vertex angle of the triangle is used for triggering the third sensor, inclined planes at two sides of the vertex angle are used as transition inclined planes, and collision damage between the sensor and the limiting block is avoided.
Further, the first sensor, the second sensor and the third sensor are all roller micro switches.
The beneficial effects of adopting the further scheme are as follows: the trigger end of the roller microswitch is fixedly provided with the roller, the roller is contacted with the limiting block and rotates, the friction force in the contact process of the sensor and the limiting block is small, and the sensor and the limiting block can be effectively prevented from being blocked.
The invention also provides a sensor self-checking method applying the automatic positioning printing head structure, which comprises the following steps: step 1: the distance of the printing head moving assembly moving from the reset position to the limit protection position is acquired and is marked as A; step 2: the print head moving assembly moves upwards from a reset position by a distance A, if the first sensor is not triggered, the first sensor fails, otherwise, the first sensor is normal; and/or if the second sensor is not triggered, the second sensor fails, otherwise the second sensor is normal; step 3: the printing head moving assembly moves downwards by a distance A, if the third sensor is not triggered in the moving process, the third sensor fails, otherwise, the third sensor is normal; step 4: if the first sensor, the second sensor and the third sensor are all normal, the self-checking is passed, otherwise, the self-checking is not passed.
The beneficial effects of the invention are as follows: after the sensors are installed, the installation position of each sensor and the installation position of each limiting block are acquired, the set distance of the printing head moving assembly moving from one position to the other position can be known, and if the distance of the printing head moving assembly moving is greater than or equal to the set distance and the sensors are not triggered, the sensor can be judged to be faulty, and maintenance is needed. The prior art printhead moving assembly is typically positioned by only one photosensor, which cannot be found in time after a sensor failure. By adopting the method, the printing head can realize the self-checking of the sensor, and the false work of the printing head moving assembly after the sensor is invalid is avoided.
Drawings
FIG. 1 is a three-dimensional view of an automated positioning printhead structure according to the present invention;
FIG. 2 is a schematic illustration of another embodiment of an automatic positioning printhead structure;
FIG. 3 is a diagram of the circuit connection relationship of the present invention;
FIG. 4 is a flow chart of a position detection method according to a first embodiment of the invention;
FIG. 5 is a position control flow chart of the present invention;
FIG. 6 is a flow chart of position detection according to a second embodiment of the present invention;
FIG. 7 is a flow chart of a sensor self-test method according to the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. the printing head comprises a first sensor, 2, a second sensor, 3, a third sensor, 4, a first limiting block, 5, a second limiting block, 6, a printing head moving assembly, 601, a printing head moving support, 6011, an upper fixing part, 6012, a lower fixing part, 602, a printing head, 7, a rack, 8, a motor, 9 and a pressure sensor.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, an automatic positioning print head structure comprises a print head moving assembly 6 and a frame 7, wherein the print head moving assembly 6 and the frame 7 are connected and move relative to the frame 7, and the automatic positioning print head structure is characterized by comprising a first sensor 1, a second sensor 2, a third sensor 3, a first limiting block 4 and a second limiting block 5; the side wall of the printing head moving assembly 6 is sequentially connected with the first sensor 1, the second sensor 2 and the third sensor 3 from top to bottom; the first limiting block 4 is connected with the rack 7 and is used for triggering the first sensor 1 and/or the second sensor 2; the second limiting block 5 is connected with the frame 7 and is used for triggering the third sensor 3.
Specifically, the first sensor, the second sensor and the third sensor can be micro-motion sensors with the model of SS-5GL2 or micro-motion sensors with other models.
As a further solution of this embodiment, as shown in fig. 1, the print head moving assembly 6 further includes a pressure sensor 9, the print head moving assembly 6 includes a print head moving support 601 and a print head 602, the print head 602 is fixedly connected to a lower portion of the print head moving support 601, the print head moving support 601 has a fixing portion 6011 and a lower fixing portion 6012 protruding outwards, a top surface of the pressure sensor 9 is connected to a bottom surface of the fixing portion 6011, and a bottom surface of the pressure sensor 9 is connected to the lower fixing portion 6012.
Specifically, the printing head comprises two pressure sensors, wherein the two pressure sensors are fixedly connected with the left side and the right side of the printing head moving support.
Specifically, the pressure sensor can be an S-shaped pull pressure sensor with a model DBBW or other pressure sensors.
As a further solution of this embodiment, the distance between the bottom surface of the first limiting block 4 and the top surface of the second limiting block 5 is greater than the distance between the top surface of the first sensor 1 and the bottom surface of the third sensor 3.
As a further development of the present embodiment, the first limiting block 4 has a triggering surface for triggering the first sensor 1 and/or the second sensor 2, the height h of the triggering surface being greater than the distance between the top surface of the first sensor 1 and the bottom surface of the second sensor 2.
As a further scheme of the embodiment, a transition inclined plane is arranged between the triggering surface and the bottom surface of the first limiting block 4, the transition inclined plane is obliquely arranged, and the included angle between the transition inclined plane and the triggering surface is 100-170 degrees.
Preferably, the included angle between the transition inclined plane and the trigger surface is 135 °.
As a further solution of this embodiment, the second limiting block 5 has a trigger point for triggering the third sensor 3, and a distance between a lower end of the trigger surface and the trigger point is greater than a distance between a top surface of the first sensor 1 and a bottom surface of the third sensor 3.
As a further solution of this embodiment, the first sensor 1, the second sensor 2 and the third sensor 3 are all roller micro switches.
Specifically, as shown in fig. 3, the first sensor 1, the second sensor 2, the third sensor 3 and the pressure sensor 9 are respectively and electrically connected with a controller of the printer, the controller is electrically connected with the motor 8, and the controller sends out an instruction to control the motor 8 to rotate after receiving signals of the sensors, and the motor 8 drives the printing head moving assembly to move. The motor 8 is a rotating motor, an output shaft of the rotating motor is fixedly connected with the screw rod, the printing head moving assembly 6 is fixedly provided with a nut matched with the screw rod, the nut is sleeved on the outer side of the screw rod, and the motor 8 rotates to drive the printing head moving assembly 6 to move up and down.
A position detection process for an automatically positioning printhead structure of this embodiment is shown in fig. 4. The reset position is the standby position of the printer, when the third sensor 3 is contacted with the second limiting block 5, the third sensor 3 is triggered, the printing head reaches the reset position, the printer is initialized, and the printer ribbon can be replaced at the position. The print head moving assembly 6 continues to move downward, and when the pressure value detected by the pressure sensor 9 reaches a preset value, the print head reaches a depressed position, that is, a working position where the print head performs printing. The print head moving assembly 6 moves upward from the reset position, and when the first sensor 1 contacts the first stopper 4, the print head reaches the cleaning position, and cleaning and maintenance of the print head can be performed. The limit guard position is the maximum position at which the print head moving assembly moves upward, and when both the first sensor 1 and the second sensor 2 are in contact with the first stopper 4, the print head moving assembly 6 does not move upward any more.
As shown in fig. 5, the controller sends an action command to the motor 8, detects the position of the print head moving assembly 6 according to signals fed back by the first sensor 1, the second sensor 2, the third sensor 3 and the pressure sensor 9, and if the target position is higher than the detected position, controls the motor 8 to enable the print head moving assembly 6 to move upwards; if the target position is lower than the detection position, the motor 8 is controlled to move the printing head moving assembly 6 downwards; if the target position is equal to the detection position, the motor 8 stops rotating.
As shown in fig. 7, this embodiment further provides a sensor self-checking method applying the automatic positioning print head structure, including:
step 1: the distance of the print head moving assembly 6 from the reset position to the limit protection position is acquired and is marked as A;
step 2: the print head moving assembly 6 moves upwards from the reset position by a distance A, if the first sensor 1 is not triggered, the first sensor 1 fails, otherwise the first sensor 1 is normal; and/or if the second sensor 2 is not triggered, the second sensor 2 fails, otherwise the second sensor 2 is normal;
specifically, in the self-checking process, whether the initial position is in place or not can be observed manually in an auxiliary manner, and adjustment is performed.
Step 3: the print head moving assembly 6 moves downwards by a distance A, if the third sensor 3 is not triggered during movement, the third sensor 3 fails, otherwise the third sensor 3 is normal;
step 4: if the first sensor 1, the second sensor 2 and the third sensor 3 are all normal, the self-checking is passed, otherwise, the self-checking is not passed.
Specifically, the distance A is measured and then stored in a controller of the printer.
In particular, the first sensor 1 and the second sensor 2 are installed as close together as possible. If one of the first sensor 1 and the second sensor 2 is found to be faulty through self-checking, the cleaning position can still be determined by only one of the first sensor 1 or the second sensor 2. If the third sensor 3 is found to be faulty through self-checking, the printer can still work normally at the stored distance a.
Example two
As shown in fig. 2, the present invention further provides another automatic positioning printhead structure, including a printhead moving assembly 6 and a frame 7, where the printhead moving assembly 6 and the frame 7 are connected and move relative to the frame 7, and include the first sensor 1, the second sensor 2, the third sensor 3, the first limiting block 4 and the second limiting block 5; the frame 7 is sequentially connected with the first sensor 1, the second sensor 2 and the third sensor 3 from top to bottom; the first limiting block 4 is fixedly connected with the upper part of the printing head moving assembly 6 and is used for triggering the first sensor 1 and/or the second sensor 2; the second limiting block 5 is fixedly connected with the lower part of the printing head moving assembly 6 and is used for triggering the third sensor 3.
Specifically, the first sensor, the second sensor and the third sensor can be micro-motion sensors with the model of SS-5GL2 or micro-motion sensors with other models.
As a further solution of this embodiment, the distance between the top surface of the first limiting block 4 and the bottom surface of the second limiting block 5 is smaller than the distance between the bottom surface of the second sensor 2 and the top surface of the third sensor 3.
As a further solution of this embodiment, the first limiting block 4 has a triggering surface for triggering the first sensor 1 and/or the second sensor 2, the height h of the triggering surface is greater than the distance between the top surface of the first sensor 1 and the bottom surface of the second sensor 2, a transition inclined surface is disposed between the triggering surface and the top surface of the first limiting block 4, and an included angle between the transition inclined surface and the triggering surface is 100 ° -170 °.
As a further solution of this embodiment, the second limiting block 5 has a trigger point for triggering the third sensor 3, and a distance between an upper end of the trigger surface and the trigger point is smaller than a distance between a bottom surface of the second sensor 2 and a top surface of the third sensor 3.
As a further aspect of this embodiment, the print head moving assembly 6 further includes a pressure sensor 9, the print head moving assembly 6 includes a print head moving bracket 601 and a print head 602, the print head 602 is fixedly connected to a lower portion of the print head moving bracket 601, the print head moving bracket 601 has an upper fixing portion 6011 and a lower fixing portion 6012 protruding outwards, a top surface of the pressure sensor 9 is connected to a bottom surface of the fixing portion 6011, and a bottom surface of the pressure sensor 9 is connected to the lower fixing portion 6012.
Specifically, the printing head comprises two pressure sensors, wherein the two pressure sensors are fixedly connected with the left side and the right side of the printing head moving support.
Specifically, the pressure sensor can be an S-shaped pull pressure sensor with a model DBBW or other pressure sensors.
As a further solution of this embodiment, the first sensor 1, the second sensor 2 and the third sensor 3 are all roller micro switches.
Specifically, as shown in fig. 3, the first sensor 1, the second sensor 2, the third sensor 3 and the pressure sensor 9 are respectively and electrically connected with a controller of the printer, the controller is electrically connected with the motor 8, and the controller sends out an instruction to control the motor 8 to rotate after receiving signals of the sensors, and the motor 8 drives the printing head moving assembly to move. The motor 8 is a rotating motor, an output shaft of the rotating motor is fixedly connected with the screw rod, the printing head moving assembly 6 is fixedly provided with a nut matched with the screw rod, the nut is sleeved on the outer side of the screw rod, and the motor 8 rotates to drive the printing head moving assembly 6 to move up and down.
A position detection process for an automatically positioning printhead structure of this embodiment is shown in fig. 6. The reset position is the standby position of the printer, when the third sensor 3 is contacted with the second limiting block 5, the third sensor 3 is triggered, the printing head reaches the reset position, the printer is initialized, and the printer ribbon can be replaced at the position. The print head moving assembly 6 continues to move downward, and when the pressure value detected by the pressure sensor 9 reaches a preset value, the print head reaches a depressed position, that is, a working position where the print head performs printing. The print head moving assembly 6 moves upward from the reset position, and when the second sensor 2 contacts the first stopper 4, the print head reaches the cleaning position, and cleaning and maintenance of the print head can be performed. The limit guard position is the maximum position at which the print head moving assembly moves upward, and when both the first sensor 1 and the second sensor 2 are in contact with the first stopper 4, the print head moving assembly 6 does not move upward any more.
As shown in fig. 5, the controller sends an action command to the motor 8, detects the position of the print head moving assembly 6 according to signals fed back by the first sensor 1, the second sensor 2, the third sensor 3 and the pressure sensor 9, and if the target position is higher than the detected position, controls the motor 8 to enable the print head moving assembly 6 to move upwards; if the target position is lower than the detection position, the motor 8 is controlled to move the printing head moving assembly 6 downwards; if the target position is equal to the detection position, the motor 8 stops rotating.
As shown in fig. 7, this embodiment further provides a sensor self-checking method applying the automatic positioning print head structure, including:
step 1: the distance of the print head moving assembly 6 from the reset position to the limit protection position is acquired and is marked as A;
step 2: the print head moving assembly 6 moves upwards from the reset position by a distance A, if the first sensor 1 is not triggered, the first sensor 1 fails, otherwise the first sensor 1 is normal; and/or if the second sensor 2 is not triggered, the second sensor 2 fails, otherwise the second sensor 2 is normal;
specifically, in the self-checking process, whether the initial position is in place or not can be observed manually in an auxiliary manner, and adjustment is performed.
Step 3: the print head moving assembly 6 moves downwards by a distance A, if the third sensor 3 is not triggered in the moving process, the third sensor 3 is in fault, otherwise, the third sensor 3 is normal;
step 4: if the first sensor 1, the second sensor 2 and the third sensor 3 are all normal, the self-checking is passed, otherwise, the self-checking is not passed.
Specifically, the distance A is measured and then stored in a controller of the printer.
In particular, the first sensor 1 and the second sensor 2 are installed as close together as possible. If one of the first sensor 1 and the second sensor 2 is found to be faulty through self-checking, the cleaning position can still be determined by only one of the first sensor 1 or the second sensor 2. If the third sensor 3 is found to be faulty through self-checking, the printer can still work normally at the stored distance a.
It should be noted that, the connection mode and control mode of the printer controller and the connection mode of the sensor in the present invention may be implemented by using the prior art, and for brevity of description, no further description is provided herein.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. An automatic positioning print head structure comprises a print head moving assembly (6) and a frame (7), wherein the print head moving assembly (6) is connected with the frame (7) and moves relative to the frame (7), and the automatic positioning print head structure is characterized by comprising a first sensor (1), a second sensor (2), a third sensor (3), a first limiting block (4) and a second limiting block (5); the side wall of the printing head moving assembly (6) is sequentially connected with the first sensor (1), the second sensor (2) and the third sensor (3) from top to bottom; the first limiting block (4) is connected with the rack (7) and is used for triggering the first sensor (1) and/or the second sensor (2); the second limiting block (5) is connected with the rack (7) and is used for triggering the third sensor (3); the first limiting block (4) is positioned above the second limiting block (5); the printing head moving assembly (6) comprises three working positions of a cleaning position, a resetting position and a limit protection position; when the first sensor (1) is in contact with the first limiting block (4), the printing head reaches a cleaning position; when the first sensor (1) and the second sensor (2) are in contact with the first limiting block (4), the printing head moving assembly (6) does not move upwards any more, and the printing head moving assembly (6) reaches a limit protection position; when the third sensor (3) is in contact with the second limiting block (5), the third sensor (3) is triggered, and the printing head moving assembly (6) reaches a reset position.
2. An automatic positioning print head structure according to claim 1, further comprising a pressure sensor (9), the print head moving assembly (6) comprising a print head moving bracket (601), the print head moving bracket (601) being connected to the frame (7) and moving relative to the frame (7), the print head moving bracket (601) having an upper fixing portion (6011) and a lower fixing portion (6012) protruding outwards, a top surface of the pressure sensor (9) being connected to a bottom surface of the upper fixing portion (6011), and a bottom surface of the pressure sensor (9) being connected to the lower fixing portion (6012).
3. An automatically positioned print head structure according to claim 1, characterized in that the distance between the bottom surface of the first stopper (4) and the top surface of the second stopper (5) is greater than the distance between the top surface of the first sensor (1) and the bottom surface of the third sensor (3).
4. An automatically positioned print head arrangement according to claim 3, characterized in that the first stopper (4) has a triggering surface for triggering the first sensor (1) and/or the second sensor (2), the triggering surface having a height which is greater than the distance between the top surface of the first sensor (1) and the bottom surface of the second sensor (2).
5. The automatic positioning printing head structure according to claim 4, wherein a transition inclined plane is arranged between the triggering surface and the bottom surface of the first limiting block (4), the transition inclined plane is obliquely arranged, and an included angle between the transition inclined plane and the triggering surface is 100-170 degrees.
6. An automatic positioning print head structure according to claim 5, characterized in that the second limiting block (5) is provided with a trigger point for triggering the third sensor (3), and the distance between the lower end of the trigger surface and the trigger point is larger than the distance between the top surface of the first sensor (1) and the bottom surface of the third sensor (3).
7. An automatic positioning printhead structure according to any of claims 1-6, wherein the first sensor (1), the second sensor (2) and the third sensor (3) are roller micro switches.
8. A sensor self-test method employing the automatic positioning printhead structure of any one of claims 1-7, comprising:
step 1: acquiring the distance of the printing head moving assembly (6) from the reset position to the limit protection position, and marking the distance as A;
step 2: the print head moving assembly (6) moves upwards from a reset position by a distance A, if the first sensor (1) is not triggered, the first sensor (1) fails, otherwise, the first sensor (1) is normal; if the second sensor (2) is not triggered, the second sensor (2) fails, otherwise the second sensor (2) is normal;
step 3: the print head moving assembly (6) moves downwards by a distance A, if the third sensor (3) is not triggered in the moving process, the third sensor (3) fails, otherwise, the third sensor (3) is normal;
step 4: and if the first sensor (1), the second sensor (2) and the third sensor (3) are normal, the self-checking is passed, otherwise, the self-checking is not passed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811623939.8A CN109435482B (en) | 2018-12-28 | 2018-12-28 | Automatic positioning printing head structure and sensor self-checking method using same |
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| CN201811623939.8A CN109435482B (en) | 2018-12-28 | 2018-12-28 | Automatic positioning printing head structure and sensor self-checking method using same |
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| CN109435482A CN109435482A (en) | 2019-03-08 |
| CN109435482B true CN109435482B (en) | 2023-09-15 |
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| CN111336149B (en) * | 2020-03-26 | 2021-11-05 | 浙江大学宁波理工学院 | Valve plate of multi-way valve |
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