Printer
By using non-contact switches and filtering circuits to detect piston position in inkjet printers, the problem of short mechanical switch life caused by piston position misalignment is solved, achieving accurate piston position detection and stable ink replenishment, and reducing maintenance costs.
Patent Information
- Application Number
- CN202423285831.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In existing inkjet printing equipment, piston position deviation leads to a short life of the mechanical switch, requiring frequent replacement and increasing maintenance costs.
Use a non-contact switch, such as a capacitive switch, for piston position detection. Combined with a filter circuit and reinforcement parts, ensure that the piston position is accurate and collision-free. Use a non-contact switch to detect the position of the piston and control the action of the drive component through the control board.
The service life of the non-contact switch is extended, the maintenance cost is reduced, and the accuracy of the piston position and the stability of ink replenishment are ensured.
Smart Images
Figure CN223456671U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of printing equipment, concretely relates to a printer. BACKGROUND
[0002] In the prior art, with the gradual popularization of inkjet printing equipment, the ink sucking and pressing methods are diversified, one of which is to rely on a motor to drive a piston to move, so as to realize the ink sucking action and then realize the ink replenishment for each printing. However, the piston may have errors in long-term movement, and when the piston position deviates too much, the piston will reach the limit position of the cavity and continue to move, which may cause the screw rod driving the piston to deform or the ink replenishment to be insufficient. In the prior art, the position of the piston movement is detected by using a mechanical switch (contact switch), and the piston ink replenishment is a very frequent action. The service life of the existing mechanical switch cannot meet the requirements, and it needs to be replaced frequently, which leads to the increase of maintenance cost. SUMMARY
[0003] The utility model aims at overcoming the above-mentioned defects or problems in the background art, and provides a printer.
[0004] To achieve the above-mentioned purpose, the utility model and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:
[0005] Scheme one, a printer, comprising
[0006] A body provided with a sliding cavity extending along a first direction and an ink supply channel communicated with the cavity bottom of the sliding cavity;
[0007] A piston adapted to repeatedly slide in the sliding cavity to supply ink through the ink supply channel;
[0008] A driving member adapted to drive the piston to slide;
[0009] A control assembly comprising a control board and a non-contact switch, the non-contact switch being located on the side away from the cavity bottom of the sliding cavity, the non-contact switch being adapted to send a first signal when the piston slides to its sensing area, the control board being electrically connected with the driving member and the non-contact switch, the control board being adapted to control the driving member to drive the piston to slide in the direction towards the cavity bottom of the sliding cavity when receiving the first signal.
[0010] Scheme two, based on scheme one, the non-contact switch is one of a capacitive switch, an infrared distance switch, a photoelectric switch, an ultrasonic switch and a magnetic switch.
[0011] Scheme three, based on scheme one, the non-contact switch senses along the first direction and towards the cavity bottom of the sliding cavity,
[0012] The distance from the non-contact switch to the bottom of the sliding cavity is defined as L1;
[0013] The maximum sensing distance of the non-contact switch is L2;
[0014] The control board is adapted to control the driving member to drive the piston to slide a distance of L3 in the direction towards the bottom of the sliding cavity when the first signal is received; the height of the piston is L4;
[0015] L1≥L2+L3+L4.
[0016] In the fourth aspect, based on the first aspect, the non-contact switch is a capacitive switch, and the capacitive switch comprises a touch circuit board and a touch area, the touch circuit board is adapted to electrically connect the touch area, and the touch circuit board is adapted to output a low voltage to form the first signal when the piston is close to the touch area.
[0017] In the fifth aspect, based on the fourth aspect, the capacitive switch further comprises a filter circuit, and the filter circuit is adapted to output a filtered voltage to the touch circuit board.
[0018] In the sixth aspect, based on the fifth aspect, the filter circuit comprises a ferrite bead FB1, a capacitor C3 and a capacitor C4, the capacitor C3 and the capacitor C4 are connected in parallel with each other, and two ends of the ferrite bead FB1 are connected to an input voltage end and an output voltage end respectively.
[0019] In the seventh aspect, based on the fourth aspect, the control assembly further comprises a reinforcing member, and the touch circuit board and / or the touch area are fixed to the reinforcing member.
[0020] In the eighth aspect, based on the fourth aspect, the touch area is located in the sliding cavity, and the touch circuit board is located outside the sliding cavity.
[0021] In the ninth aspect, based on the first aspect, one-way valves are arranged upstream and downstream of the position where the ink supply channel communicates with the sliding cavity.
[0022] As can be seen from the above description of the utility model and its preferred embodiments, compared with the prior art, the technical scheme of the utility model and its preferred embodiments have the following beneficial effects due to the following technical means:
[0023] 1. In the first aspect and the preferred embodiments thereof, a printer comprises a body, a piston, a driving member and a control assembly. The body is provided with a sliding cavity extending along a first direction and an ink supply channel communicating with the cavity bottom of the sliding cavity. The piston is adapted to repeatedly slide in the sliding cavity to make the ink upstream of the ink supply channel enter the sliding cavity by generating negative pressure and positive pressure and be discharged from the sliding cavity to the downstream of the ink supply channel. The driving member is adapted to drive the piston to slide to provide power for the piston. The control assembly comprises a control board and a non-contact switch. The non-contact switch is located away from the side of the cavity bottom of the sliding cavity to prevent the ink from affecting the detection. The non-contact switch is adapted to send a first signal when the piston slides to its sensing area, at which time the position of the piston is the zero return position of the piston. The control board is electrically connected with the driving member and the non-contact switch. The control board is adapted to control the driving member to drive the piston to slide towards the cavity bottom of the sliding cavity when the first signal is received, thereby realizing the detection and calibration of the position of the piston. Compared with the contact type mechanical switch, the non-contact switch is used to detect the position of the piston, which can prevent collision damage due to the absence of the acting force of the piston and has a longer service life.
[0024] 2. In the second aspect and the preferred embodiments thereof, the non-contact switch is one of a capacitive switch, an infrared distance switch, a photoelectric switch, an ultrasonic switch and a magnetic switch, thereby realizing the non-contact detection of the position of the piston.
[0025] 3. In the third aspect and the preferred embodiments thereof, the non-contact switch senses along the first direction and towards the cavity bottom of the sliding cavity. The distance from the non-contact switch to the cavity bottom of the sliding cavity is defined as L1. The maximum sensing distance of the non-contact switch is L2. The control board is adapted to control the driving member to drive the piston to slide towards the cavity bottom of the sliding cavity by a distance of L3 when the first signal is received. The height of the piston is L4. Then L1≥L2+L3+L4. Even if the sensing distance of the non-contact switch changes due to environmental factors, the piston can still move with the working stroke L3 in the cavity to ensure the stability of ink replenishment.
[0026] 4. In the fourth aspect and the preferred embodiments thereof, the non-contact switch is a capacitive switch. The capacitive switch comprises a touch circuit board and a touch area. The touch circuit board is adapted to be electrically connected with the touch area. The touch circuit board is adapted to output a low voltage when the piston approaches the touch area to form the first signal, thereby realizing the generation of the first signal.
[0027] 5. In the fifth aspect and the preferred embodiments thereof, the capacitive switch further comprises a filter circuit to output a voltage filtered through the filter circuit to the touch circuit board to reduce the external interference on the power supply.
[0028] 6. In Scheme 6 and its preferred embodiment, the filtering circuit includes a ferrite bead FB1, a capacitor C3 and a capacitor C4. The capacitor C3 and the capacitor C4 are connected in parallel with each other, and the two ends are connected to the input voltage end and the ground end respectively; the two ends of the ferrite bead FB1 are connected to the input voltage end and the output voltage end respectively. The ferrite bead FB1, the capacitor C3 and the capacitor C4 work together to reduce the high-frequency noise and fluctuations on the power line, providing a cleaner power supply to the subsequent circuit.
[0029] 7. In Option 7 and its preferred embodiment, when the touch circuit board and / or touch area is in the form of a thin sheet, the touch circuit board and / or touch area are fixedly connected to the reinforcing member to reinforce the strength of the touch circuit board and / or touch area, thereby providing a basis for welding the touch circuit board and / or touch area to other parts.
[0030] 8. In Option 8 and its preferred embodiment, the touch area is located in the sliding cavity to better detect the position of the piston, and the touch circuit board is located outside the sliding cavity to reduce the space occupied by the sliding cavity, reduce the volume of the main body, and make the product size smaller.
[0031] 9. In the ninth solution and its preferred embodiment, the ink supply channel is provided with a one-way valve upstream and downstream of the position where it is connected to the sliding cavity to prevent ink from flowing back. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0033] Figure 1 A partial perspective view of the printer in Example 1;
[0034] Figure 2 It is a three-dimensional diagram of the motor base in Example 1;
[0035] Figure 3 A partial perspective view of the control assembly in Example 1;
[0036] Figure 4 This is a schematic structural diagram of the printer in Example 1;
[0037] Figure 5 Schematic diagram of the dimensions of the printer in Example 1;
[0038] Figure 6 is a circuit diagram of the printer in Example 1;
[0039] Description of main reference numerals:
[0040] Body 1; housing 11; sliding cavity 111; ink supply channel 112; motor base 12; rotation stopping hole 121; piston 2; driving member 3; rotation motor 31; guide rod 32; non-contact switch 4; touch circuit board 41; touch area 42; reinforcing member 5; first direction 6; DETAILED DESCRIPTION
[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as exclusion of other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0042] In the claims, the description and the above drawings of the present application, unless otherwise explicitly limited, the terms such as "first", "second" or "third" are used only to distinguish different objects, and are not used to describe a specific order.
[0043] In the claims, the description and the above drawings of the present application, unless otherwise explicitly limited, for the terms of orientation, such as "center", "transverse", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation and position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, so it cannot be understood as limiting the specific protection scope of the present application.
[0044] In the claims, the description and the above drawings of the present application, unless otherwise explicitly limited, such as the terms "fixedly connected" or "fixedly connected", should be broadly understood, that is, any connection mode without displacement relationship and relative rotation relationship between the two, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.
[0045] In the claims, the description and the above drawings of the present application, such as the terms "including", "having" and their variants, are intended to mean "including but not limited to".
[0046] Reference Figures 1-6 A kind of printer, including body 1, piston 2, driving member 3 and control assembly.
[0047] Reference Figure 1 、 Figure 2 ,Figure 4 The body 1 comprises a housing 11 and a motor base 12. Referring to Figure 4 The housing 11 is provided with a sliding cavity 111 extending along the first direction 6, and an ink supply passage 112 communicating with the cavity bottom of the sliding cavity 111, the sliding cavity 111 is provided with an opening above for the driving part of the driving member 3 to extend into the sliding cavity 111. The ink supply passage 112 is provided with a one-way valve upstream and downstream of the position communicating with the sliding cavity 111. The ink supply passage 112 is used to provide ink for printing.
[0048] Referring to Figure 4 The motor base 12 is fixed to the housing 11 by screws, and the motor base 12 is provided with a rotation-stopping hole 121 extending along the first direction 6, the cross section of the rotation-stopping hole 121 is a non-circular surface.
[0049] Referring to Figure 4 The driving member 3 is adapted to drive the piston 2 to slide; the driving member 3 comprises a rotation motor 31 and a guide rod 32, the rotation motor 31 is seated on the motor base 12, and the output end of the rotation motor 31 extends into the rotation-stopping hole 121. The output end of the rotation motor 31 is threadedly connected with the guide rod 32, that is, one of the output end of the rotation motor 31 and the guide rod 32 has an external thread, and the other has an internal thread matched with the external thread. The guide rod 32 penetrates the rotation-stopping hole 121, and the cross section shape of the guide rod 32 is adapted to the cross section of the rotation-stopping hole 121 to rotationally fit with the rotation-stopping hole 121 of the body 1, so that when the output end of the rotation motor 31 rotates, the guide rod 32 extends and retracts relative to the output shaft of the rotation motor 31. The end of the guide rod 32 away from the output end of the rotation motor 31 is fixedly connected with the piston 2 to drive the piston 2 to slide, and in this embodiment, the guide rod 32 is fixedly connected with the piston 2 by threadedly connecting.
[0050] Referring to Figure 4 The piston 2 is adapted to repeatedly slide in the sliding cavity 111 to supply ink through the ink supply passage 112; the piston 2 is sealingly fitted with the cavity wall of the sliding cavity 111 by a sealing ring, so as to prevent liquid leakage and ensure stable ink supply.
[0051] Referring to Figure 3 , Figure 4 The control assembly comprises the reinforcing member 5, a control board (not shown in the figure) and a non-contact switch 4.
[0052] The non-contact switch 4 is located away from the cavity bottom of the sliding cavity 111, and the non-contact switch 4 is adapted to send a first signal when the piston 2 slides to its sensing area, at this time the position of the piston 2 is the zero position of the piston 2. The non-contact switch 4 is one of a capacitive switch, an infrared distance switch, a photoelectric switch, an ultrasonic switch and a magnetic switch. The sensing mode of the non-contact switch 4 can be along the first direction 6, or along a direction perpendicular to the first direction 6 (i.e. the radial direction of the sliding cavity 111 in this embodiment).
[0053] The control board is electrically connected with the non-contact switch 4 and the driving member 3, and the control board is adapted to control the driving member 3 to drive the piston 2 to slide towards the bottom of the sliding cavity 111 when receiving the first signal.
[0054] In this embodiment, the non-contact switch 4 senses in the first direction 6 and towards the bottom of the sliding cavity 111.
[0055] With reference to Figure 5 , the distance from the non-contact switch 4 (the side towards the bottom of the sliding cavity 111) to the bottom of the sliding cavity 111 is defined as L1; the maximum sensing distance of the non-contact switch 4 is defined as L2; the distance (i.e. the working stroke of the piston 2) that the control board is adapted to control the driving member 3 to drive the piston 2 to slide towards the bottom of the sliding cavity 111 when receiving the first signal is defined as L3; the height of the piston 2 is defined as L4; then L1≥L2+L3+L4.
[0056] Preferably, the non-contact switch 4 is a capacitive switch. Compared with other types of non-contact switches 4, such as infrared distance switches, photoelectric switches requiring a transmitter and a receiver, ultrasonic switches with a delay, and magnetic switches with a complexity, the capacitive switch occupies a smaller size and is thinner and lighter, has a simple structure, and has a longer service life.
[0057] With reference to Figure 6 , the capacitive switch comprises a touch circuit board 41, a touch area 42, and a filter circuit. The touch area 42 is in the form of a sheet and is sleeved on the guide rod 32. The touch area 42 is located in the sliding cavity 111 and senses in the first direction 6 and towards the bottom of the sliding cavity 111. The touch area 42 is integrated with the touch circuit board 41. The connection part of the touch area 42 and the touch circuit board 41 extends out of the opening of the sliding cavity 111 so that the touch circuit board 41 is located outside the sliding cavity 111. With reference to Figure 5 , the above L1 refers to the distance from the touch area 42 to the bottom of the sliding cavity 111 in this embodiment.
[0058] The third pin of the touch circuit board 41 (U1 in Figure 6 ) is adapted to be electrically connected with the touch area 42 (PAD1 in Figure 6 ). The first pin of the touch circuit board 41 is adapted to output a low voltage when the piston 2 is close to the touch area 42 to form the first signal, and is adapted to output a high voltage when the piston 2 is away from the touch area 42.
[0059] The filter circuit comprises a ferrite bead FB1, a capacitor C3, and a capacitor C4. The capacitor C3 and the capacitor C4 are connected in parallel with each other and are connected to the two ends of the ferrite bead FB1 respectively to be close to the input voltage end and the output voltage end respectively. The capacitor C3 and the capacitor C4 are also grounded. The output voltage end outputs a voltage filtered via the filter circuit to the touch circuit board 41.
[0060] The reinforcing member 5 is fixed to the touch circuit board 41 and / or the touch area 42, and is used to reinforce the strength of the touch circuit board 41 and / or the touch area 42, so as to provide a basis for the welding of the touch circuit board 41 and / or the touch area 42 with other parts. In the embodiment, the material of the reinforcing member 5 corresponding to the touch area 42 is FR4, and the material of the reinforcing member 5 corresponding to the touch circuit board 41 is PI.
[0061] In use, when the normal use is to refill the ink, the control board controls the driving member 3 to drive the piston 2 to slide in the sliding cavity 111, so as to realize the refilling of the ink. After a period of use, the piston 2 needs to be reset, at this time, the non-contact switch 4 (not working in real time) starts to work, when the piston 2 approaches the touch area 42, the first pin of the touch circuit board 41 outputs a low level to form a first signal, at this time, the position of the piston 2 is the reset position of the piston 2, when the control board receives the first signal, it controls the driving member 3 to drive the piston 2 to slide along the direction towards the bottom of the sliding cavity 111 within the working stroke of the piston 2.
[0062] Compared with the prior art, the embodiment has the following beneficial effects:
[0063] In an exemplary embodiment, a printer comprises a body 1, a piston 2, a driving member 3 and a control assembly. The body 1 is provided with a sliding cavity 111 extending along a first direction 6 and an ink supply channel 112 communicating with the bottom of the sliding cavity 111, the piston 2 is adapted to slide repeatedly in the sliding cavity 111 to make the ink upstream of the ink supply channel 112 enter the sliding cavity 111 by generating negative pressure and positive pressure, and then be discharged from the sliding cavity 111 to the downstream of the ink supply channel 112. The driving member 3 is adapted to drive the piston 2 to slide, so as to provide power for the piston 2. The control assembly comprises a control board and a non-contact switch 4, the non-contact switch 4 is located away from the side of the bottom of the sliding cavity 111, so as to prevent the ink from affecting the detection. The non-contact switch 4 is adapted to send a first signal when the piston 2 slides to its sensing area, at this time, the position of the piston 2 is the reset position of the piston 2, the control board is electrically connected with the driving member 3 and the non-contact switch 4, and the control board is adapted to control the driving member 3 to drive the piston 2 to slide along the direction towards the bottom of the sliding cavity 111 when receiving the first signal, so as to realize the detection and calibration of the position of the piston 2. Compared with the contact type mechanical switch, the non-contact switch 4 is used to detect the position of the piston 2, and since it is not affected by the acting force of the piston 2, it can prevent collision damage and has a longer service life.
[0064] In an exemplary embodiment, the non-contact switch 4 is one of a capacitive switch, an infrared distance switch, a photoelectric switch, an ultrasonic switch and a magnetic switch, so as to realize the non-contact detection of the position of the piston 2.
[0065] In an exemplary embodiment, the non-contact switch 4 is inductive in the first direction 6 and towards the bottom of the sliding cavity 111, and the distance between the non-contact switch 4 and the bottom of the sliding cavity 111 is defined as L1; the maximum inductive distance of the non-contact switch 4 is L2; the control panel is adapted to control the driving member 3 to drive the piston 2 to slide towards the bottom of the sliding cavity 111 by a distance of L3 when receiving the first signal; the height of the piston 2 is L4; then L1≥L2+L3+L4, so that even if the inductive distance of the non-contact switch 4 changes due to environmental factors, the piston 2 can still move in the working stroke L3 in the cavity, thereby ensuring the stability of the ink replenishment.
[0066] In an exemplary embodiment, the non-contact switch 4 is a capacitive switch, and the capacitive switch includes a touch circuit board 41 and a touch area 42, the touch circuit board 41 is adapted to be electrically connected to the touch area 42, and the touch circuit board 41 is adapted to output a low voltage when the piston 2 approaches the touch area 42 to form the first signal, thereby realizing the generation of the first signal.
[0067] In an exemplary embodiment, the capacitive switch further includes a filter circuit to output a filtered voltage to the touch circuit board 41, thereby reducing external interference to the power supply.
[0068] In an exemplary embodiment, the filter circuit includes a ferrite bead FB1, a capacitor C3 and a capacitor C4, the capacitor C3 and the capacitor C4 are connected in parallel to each other and connected to an input voltage end and a ground end respectively; the two ends of the ferrite bead FB1 are connected to an input voltage end and an output voltage end respectively, and the ferrite bead FB1, the capacitor C3 and the capacitor C4 cooperate to reduce high-frequency noise and fluctuations on the power supply line and provide a cleaner power supply to the subsequent circuit.
[0069] In an exemplary embodiment, when the touch circuit board 41 and / or the touch area 42 are in the form of a sheet, the touch circuit board 41 and / or the touch area 42 are fixed to the reinforcing member 5 to reinforce the strength of the touch circuit board 41 and / or the touch area 42, thereby providing a basis for welding the touch circuit board 41 and / or the touch area 42 to other parts.
[0070] In an exemplary embodiment, the touch area 42 is located in the sliding cavity 111 to better detect the position of the piston 2, and the touch circuit board 41 is located outside the sliding cavity 111 to reduce the occupation of the space of the sliding cavity 111, reduce the volume of the body 1, and make the product size smaller.
[0071] In an exemplary embodiment, the ink supply channel 112 is provided with a one-way valve upstream and downstream of the position communicating with the sliding cavity 111 to prevent backflow of the ink.
[0072] In an exemplary embodiment, the driving member 3 comprises a rotating motor 31 and a guide rod 32, the output end of the rotating motor 31 is threadedly connected with the guide rod 32, the guide rod 32 is rotationally connected with the body 1 and is fixedly connected with the piston 2.
[0073] The above description and embodiment are used to explain the scope of protection of the present application, but do not constitute a limitation on the scope of protection of the present application. Through the inspiration of the present application or the above embodiment, the modification, equivalent replacement or other improvement of the present application embodiment or one part of the technical features can be obtained by the ordinary skill in the art combined with the common knowledge, the ordinary skill in the art and / or the prior art through logical analysis, reasoning or limited test, which should be included in the protection scope of the present application.
Claims
1. A printer characterized by: The body (1) is provided with a sliding cavity (111) extending along a first direction (6) and an ink supply channel (112) communicating with the cavity bottom of the sliding cavity (111); The piston (2) is adapted to repeatedly slide in the sliding cavity (111) to supply ink through the ink supply channel (112); The driving member (3) is adapted to drive the piston (2) to slide; The control assembly comprises a control board and a non-contact switch (4) located on the side away from the cavity bottom of the sliding cavity (111), the non-contact switch (4) is adapted to send a first signal when the piston (2) slides to its sensing area, and the control board is electrically connected with the driving member (3) and the non-contact switch (4), and the control board is adapted to control the driving member (3) to drive the piston (2) to slide in the direction towards the cavity bottom of the sliding cavity (111) when receiving the first signal. The non-contact switch (4) is one of a capacitive switch, an infrared distance switch, a photoelectric switch, an ultrasonic switch and a magnetic switch.
2. A printer as claimed in claim 1, characterized in that: The non-contact switch (4) senses in the first direction (6) and towards the cavity bottom of the sliding cavity (111), 3. A printer as claimed in claim 1, wherein: The distance from the non-contact switch (4) to the cavity bottom of the sliding cavity (111) is defined as L1; The maximum sensing distance of the non-contact switch (4) is L2; The distance that the control board controls the driving member (3) to drive the piston (2) to slide in the direction towards the cavity bottom of the sliding cavity (111) when receiving the first signal is L3; The height of the piston (2) is L4; L1≥L2+L3+L4. The capacitive switch comprises a touch circuit board (41) and a touch area (42), the touch circuit board (41) is adapted to electrically connect the touch area (42), and the touch circuit board (41) is adapted to output a low level when the piston (2) is close to the touch area (42) to form the first signal.
4. A printer as claimed in claim 1, characterized in that: The capacitive switch further comprises a filter circuit to output a filtered voltage to the touch circuit board (41).
5. A printer as claimed in claim 4, wherein: The filter circuit comprises a ferrite bead FB1, a capacitor C3 and a capacitor C4, the capacitor C3 and the capacitor C4 are connected in parallel with each other and are connected to both ends of the ferrite bead FB1 to be close to the input voltage end and the output voltage end respectively, and the capacitor C3 and the capacitor C4 are also grounded.
6. A printer as claimed in claim 5, wherein: The control assembly further comprises a reinforcing member (5), and the touch circuit board (41) and / or the touch area (42) are fixedly connected with the reinforcing member (5).
7. A printer as claimed in claim 4, wherein: The touch area (42) is located in the sliding cavity (111), and the touch circuit board (41) is located outside the sliding cavity (111).
8. A printer as claimed in claim 4, wherein: The ink supply channel (112) is provided with a one-way valve upstream and downstream of the communication position with the sliding cavity (111).
9. A printer as claimed in claim 1, characterized in that: