Keyboard cover plate processing technology

Abstract

The invention discloses a keyboard cover plate processing technology, and belongs to the technical field of keyboard cover plate processing. A keyboard cover plate processing technology comprises a rack, a lifting assembly is arranged on the top wall of the rack, a printing mechanism is arranged at the telescopic end of the lifting assembly, the printing mechanism comprises a frame body and a scraping assembly, the frame body is provided with a printing cavity, a through opening is formed in the bottom wall of the printing cavity, and a silk-screen printing plate is detachably arranged at the through opening. Two cleaning assemblies capable of moving oppositely or oppositely are arranged in the printing cavity, and a cleaning plate is detachably arranged between the two cleaning assemblies. By means of the containing cavities formed in the two ends of the printing cavity, redundant pigment can be pushed into the containing cavity in the moving direction during printing, the process is repeated, the utilization rate of the pigment is increased, meanwhile, the pigment is injected into the containing cavities and then scraped through the scraper, uneven pigment printing is avoided, repeated scraping is not needed, and the printing efficiency is improved. And the phenomena of skip printing, non-uniform coloring and infirm coloring in printing are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of keyboard cover processing, and in particular to a keyboard cover processing technology. Background Art

[0002] With the development of electronic devices, keyboards, as an important part of input devices, are becoming more and more valued for their appearance and durability. The traditional keyboard cover processing technology usually includes injection molding, surface treatment, character printing and other steps.

[0003] Among them, when printing characters and patterns on the keyboard cover, high-precision screen printing technology is mostly used to print characters and patterns on the cured coating. In the prior art, when performing high-precision screen printing, a pigment feeding device is mostly set above the screen printing plate, and most of them are supplied by a single point or multiple points. When printing with a scraper, it is very easy to cause uneven printing of the pigment, and repeated scraping is required. Summary of the invention

[0004] The invention provides a keyboard cover processing technology, which can overcome certain defects of the prior art.

[0005] According to a keyboard cover processing technology of the present invention, it includes a frame, a lifting assembly is provided at the top wall of the frame, a printing mechanism is provided at the telescopic end of the lifting assembly, the printing mechanism includes a frame body and a scraper assembly, the frame body has a printing cavity, a through opening is formed at the bottom wall of the printing cavity, a screen printing plate is detachably provided at the through opening, two cleaning assemblies that can move back to back or towards each other are provided in the printing cavity, a cleaning plate is detachably provided between the two cleaning assemblies, and a storage cavity for storing pigment is formed between the cleaning plate and the corresponding printing cavity; A slide groove is formed on the side wall of the printing cavity along the length direction of the frame body, and a scraper assembly is slidably arranged in the slide groove. The scraper assembly is used for reciprocatingly scraping the paint in the storage cavity.

[0006] Preferably, a conveyor belt is provided at the top wall of the frame, a plurality of card seats are provided at the top wall of the conveyor belt, and a card tray for placing a keyboard cover is detachably provided at the card seat.

[0007] Through the above structure, human intervention is reduced in an automated or semi-automated manner, so that the printing process of the keyboard cover can be carried out continuously, thereby improving production efficiency.

[0008] Preferably, the cleaning assembly includes a mounting plate slidably arranged on the side wall of the frame, a cylinder is provided on the side wall of the mounting plate, a guide groove is formed on the side wall of the mounting plate, a fixed seat is slidably arranged in the guide groove, the fixed seat is arranged at the telescopic end of the cylinder, a hanging arm with an opening facing upward for the installation of the cleaning plate is provided on one side wall of the fixed seat, a lock is rotatably provided on the hanging arm, and the lock is used to limit the cleaning plate.

[0009] Through the above structure, the position of the cleaning plate can be adjusted. It can be understood that the cleaning plate is often in contact with the bottom wall of the printing chamber. As shown in the figure, the cylinder works to lift the cleaning plate to the same height as the scraper assembly. When the scraper assembly passes through the cleaning plate, the pigment exceeding the height of the scraper assembly is scraped off, thereby reducing the color paste carrying capacity of the scraper assembly and preventing excess pigment from falling to the rear of the scraper assembly during the return stroke of the brush, resulting in contamination or excessive brushing. The scraper assembly controls the cylinder to work through the rear controller to lower the cleaning plate back to its original position, cut off the pigment, and prevent the pigment from flowing to the screen.

[0010] At the same time, the setting of the hanging arm and the lock makes it easy to replace the cleaning plate, thereby improving the versatility and maintainability of the cleaning assembly.

[0011] Preferably, a connecting block is further provided at the side wall of the mounting plate, the connecting block has an extension arm extending toward the cylinder, an adjusting bolt is rotatably provided at the extension arm, and a clamping portion is provided at the bottom of the adjusting bolt, and the clamping portion is used to limit the upward stroke of the fixing seat; An adjusting seat is rotatably provided at the top of the fixing seat corresponding to the pressing part, and a fine adjustment part with equal height intervals is formed on the top wall of the adjusting seat. The fine adjustment part is used to cooperate with the pressing part to form a fine adjustment of the fixing seat.

[0012] The extension arm on the connecting block and the rotatable adjusting bolt constitute a limiting mechanism for the upward stroke of the fixing seat. When the cylinder drives the fixing seat to move upward, the clamping part of the adjusting bolt will contact the fixing seat and produce a limiting effect, preventing it from rising excessively and leaving the preset working range.

[0013] The adjustment seat arranged on the top of the fixed seat and the fine adjustment part on the top wall cooperate with the clamping part of the adjusting bolt to achieve precise adjustment of the position of the fixed seat. By rotating the adjusting bolt, the contact position between the clamping part and the fine adjustment part can be changed, thereby fine-tuning the height of the fixed seat to achieve a more precise adjustment effect.

[0014] It can be understood that the combination of travel limit and fine adjustment functions not only ensures the stability of the fixed seat during movement, but also improves its positioning accuracy, so that the cleaning plate maintains stable contact with the surface to be cleaned during the cleaning process, thereby improving the cleaning effect.

[0015] Preferably, the bottom wall of the cleaning plate has a cleaning portion inclined toward one side of the corresponding receiving cavity, and the cleaning portion is used to contact and cooperate with the scraper assembly.

[0016] By means of the above structure, the effect of scraping off the paint on the top of the scraper component can be improved.

[0017] Preferably, a feeding assembly for providing pigment is provided at the top of the storage chamber, the feeding assembly includes a storage box fixedly provided at the top wall of the frame, the storage box has a containing chamber, the containing chamber is used to place the pigment, a feed port is formed at the top of the containing chamber, a cap is clamped at the feed port, the cap is used to keep the containing chamber sealed, a plurality of conduits are connected to the bottom of the containing chamber, the plurality of conduits are all connected to the storage chamber, and a solenoid valve is provided at the conduit.

[0018] The above structure makes it easier to replenish the pigment, and the coordination of the solenoid valve makes it more accurate to replenish the storage chamber.

[0019] Preferably, a liquid level sensor is provided at the bottom wall of the storage cavity, and the liquid level sensor is electrically connected to the solenoid valve. The liquid level sensor is used to send a signal to the controller when the pigment level in the storage cavity is lower than a preset threshold value. The controller controls the solenoid valve to replenish pigment until the pigment level is greater than or equal to the preset threshold value.

[0020] Through the above structure, the material can be replenished automatically without human intervention, thus avoiding the situation where the scraping component is empty due to insufficient pigment or no pigment.

[0021] Preferably, the scraper assembly has a lead screw arranged in a chute, a scraper is matched at the lead screw, and a motor for driving the lead screw to reciprocate is arranged in the chute, so that the scraper assembly can reciprocate and scrape at a uniform speed.

[0022] Preferably, a linear module is provided at the side wall of the frame, and the cleaning assembly is provided at the moving end of the linear module.

[0023] Through the above structure, the position of the cleaning component can be adjusted to be suitable for screens of different sizes, thereby reducing the stroke of brushing and improving the application range of the device.

[0024] The method of use includes the following steps: S1. According to the shape of the keyboard cover and the character pattern to be printed, a screen printing plate is produced; S2. De-staticize the keyboard cover; S3, installing the screen plate with the required printing pattern to the opening; S4, placing the keyboard cover to be printed on the chuck at the conveyor belt, and the conveyor belt moves step by step to the corresponding position of the screen printing plate; S5, the cleaning component moves back and forth to apply the paint in the storage cavity to the corresponding positions of the keyboard cover and the screen printing plate; S6, the conveyor belt moves step by step to the corresponding position of the next screen printing plate, and the cleaning component moves back and forth to brush the paint in the storage cavity for a second time to the corresponding position of the keyboard cover and the screen printing plate.

[0025] Through the above, the printing operation can be automatically and continuously performed, thereby improving the printing efficiency and printing effect.

[0026] The beneficial effects of the present invention are as follows: The keyboard cover processing technology disclosed in the present invention has storage cavities set at both ends of the printing cavity. When printing, excess paint can be pushed into the storage cavity in the moving direction, and this can be repeated, thereby improving the utilization rate of the paint. At the same time, by injecting the paint into the storage cavity and then scraping it with a scraper, uneven printing of the paint is avoided, and there is no need for repeated scraping, thus avoiding the phenomenon of missing printing, uneven coloring, and loose coloring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic diagram of the overall structure of a keyboard cover processing technology.

[0028] Figure 2 The present invention is a schematic diagram of the printing mechanism structure of a keyboard cover processing technology.

[0029] Figure 3 The present invention is a schematic diagram of the cross-sectional structure of a feeding component in a keyboard cover processing technology.

[0030] Figure 4 The present invention is a schematic diagram of the cross-sectional structure of a printing mechanism for a keyboard cover processing technology.

[0031] Figure 5 The present invention is a schematic diagram of the cleaning component structure of a keyboard cover processing technology.

[0032] 100, frame; 110, conveyor belt; 120, card seat; 130, chuck; 140, lifting assembly; 150, printing mechanism; 210, frame; 220, port; 230, screen printing plate; 240, feeding assembly; 250, cleaning assembly; 310, storage chamber; 320, storage box; 330, guide tube; 340, cap; 350, scraper assembly; 410, linear module; 420, slide; 510, mounting plate; 511, guide groove; 520, connecting block; 530, extension arm; 540, adjusting bolt; 550, cylinder; 560, fixing seat; 570, hanging arm; 580, cleaning plate; 590, lock. DETAILED DESCRIPTION

[0033] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it. Example

[0034] See also Figure 1-5The present embodiment provides a keyboard cover processing device, which includes a frame 100, a lifting assembly 140 is provided at the top wall of the frame 100, a printing mechanism 150 is provided at the telescopic end of the lifting assembly 140, the printing mechanism 150 includes a frame 210 and a scraper assembly 350, the frame 210 has a printing cavity, a through opening 220 is formed at the bottom wall of the printing cavity, a screen printing plate 230 is detachably provided at the through opening 220, two cleaning assemblies 250 that can move back to back or towards each other are provided in the printing cavity, a cleaning plate 580 is detachably provided between the two cleaning assemblies 250, and a storage cavity 310 for storing pigments is formed between the cleaning plate 580 and the corresponding printing cavity; A slide groove 420 is formed on the side wall of the printing cavity along the length direction of the frame 210 , and a scraper assembly 350 is slidably arranged in the slide groove 420 . The scraper assembly 350 is used to reciprocately scrape the paint in the storage cavity 310 .

[0035] A keyboard cover processing technology disclosed in the present invention has storage cavities 310 set at both ends of the printing cavity. During printing, excess paint can be pushed into the storage cavity 310 in the moving direction, and this can be repeated, thereby improving the utilization rate of the paint. At the same time, by injecting the paint into the storage cavity 310 and then scraping it with a scraper, uneven printing of the paint is avoided, and there is no need for repeated scraping, thereby avoiding the phenomenon of missing prints, uneven coloring, and loose coloring.

[0036] It can be understood that the above-mentioned pigment feeding method can avoid the situation where the pigment drips from the feeding port of the traditional pigment feeding device to contaminate the screen and cause waste.

[0037] In this embodiment, a conveyor belt 110 is provided on the top wall of the frame 100 , a plurality of card holders 120 are provided on the top wall of the conveyor belt 110 , and a card tray 130 for placing a keyboard cover is detachably provided on the card holder 120 .

[0038] Through the above structure, human intervention is reduced in an automated or semi-automated manner, so that the printing process of the keyboard cover can be carried out continuously, thereby improving production efficiency.

[0039] In this embodiment, the cleaning assembly 250 includes a mounting plate 510 slidably disposed on the side wall of the frame 210, a cylinder 550 is provided on the side wall of the mounting plate 510, a guide groove 511 is formed on the side wall of the mounting plate 510, a fixing seat 560 is slidably disposed in the guide groove 511, the fixing seat 560 is disposed at the telescopic end of the cylinder 550, a hanging arm 570 with an opening upward for the installation of a cleaning plate 580 is provided on one side wall of the fixing seat 560, a lock 590 is rotatably provided on the hanging arm 570, and the lock 590 is used to limit the cleaning plate 580.

[0040] A distance sensor is provided at the cleaning plate 580 , and the distance sensor is used to identify the scraper assembly 350 . When the scraper assembly 350 moves to within a preset range of the distance sensor, a signal is sent to the controller, and the controller controls the cylinder 550 to work.

[0041] Through the above structure, the position of the cleaning plate 580 can be adjusted. It can be understood that the cleaning plate 580 is always in contact with the bottom wall of the printing chamber. Figure 3 As shown, the cylinder 550 works to lift the cleaning plate 580 to the same height as the scraper assembly 350. When the scraper assembly 350 passes through the cleaning plate 580, the paint that exceeds the height of the scraper assembly 350 is scraped off, reducing the color paste carrying capacity of the scraper assembly 350, and preventing excess paint from falling behind the scraper assembly 350 during the return stroke of painting, causing contamination or excessive painting. The scraper assembly 350 controls the operation of the cylinder 550 through the rear controller, and lowers the cleaning plate 580 back to its original position, isolating the paint and preventing the paint from flowing to the screen.

[0042] At the same time, the arrangement of the hanging arm 570 and the locking buckle 590 facilitates the replacement of the cleaning plate 580 , thereby improving the versatility and maintainability of the cleaning assembly 250 .

[0043] In this embodiment, a connecting block 520 is further provided at the side wall of the mounting plate 510. The connecting block 520 has an extension arm 530 extending toward the cylinder 550. An adjusting bolt 540 is rotatably provided at the extension arm 530. The adjusting bolt 540 has a pressing portion at the bottom thereof, and the pressing portion is used to limit the upward travel of the fixing seat 560. An adjustment seat is rotatably provided at the top of the fixing seat 560 corresponding to the pressing part, and fine adjustment parts with equal height intervals are formed on the top wall of the adjustment seat. The fine adjustment parts are used to cooperate with the pressing part to form fine adjustment of the fixing seat 560.

[0044] The extension arm 530 and the rotatable adjusting bolt 540 on the connecting block 520 constitute a limiting mechanism for the upward stroke of the fixing seat 560. When the cylinder 550 drives the fixing seat 560 to move upward, the clamping part of the adjusting bolt 540 will contact the fixing seat 560 and produce a limiting effect, preventing it from rising excessively and leaving the preset working range.

[0045] The adjustment seat arranged on the top of the fixed seat 560 and the fine adjustment part on the top wall cooperate with the clamping part of the adjusting bolt 540 to achieve precise adjustment of the position of the fixed seat 560. By rotating the adjusting bolt 540, the contact position between the clamping part and the fine adjustment part can be changed, thereby fine-tuning the height of the fixed seat 560 to achieve a more precise adjustment effect.

[0046] It can be understood that the combination of travel limit and fine adjustment functions not only ensures the stability of the fixed seat 560 during movement, but also improves its positioning accuracy, so that the cleaning plate 580 maintains stable contact with the surface to be cleaned during the cleaning process, thereby improving the cleaning effect.

[0047] In this embodiment, a cleaning portion is provided at the bottom wall of the cleaning plate 580 and is inclined toward one side of the corresponding receiving cavity 310 , and the cleaning portion is used to contact and cooperate with the scraper assembly 350 .

[0048] Through the above structure, the paint scraping effect can be improved when scraping the paint on the top of the scraper assembly 350.

[0049] In this embodiment, the top of the storage chamber 310 is connected to a feeding assembly 240 for providing pigments. The feeding assembly 240 includes a storage box 320 fixedly arranged on the top wall of the frame 210. The storage box 320 has a holding chamber for placing pigments. A feed port is formed at the top of the holding chamber. A cap 340 is clamped at the feed port. The cap 340 is used to keep the holding chamber sealed. A plurality of conduits 330 are connected to the bottom of the holding chamber. The plurality of conduits 330 are all connected to the storage chamber 310. A solenoid valve is provided at the conduit 330.

[0050] The above structure facilitates the replenishment of pigment, and the coordination of the solenoid valve enables more accurate replenishment of the storage chamber 310 .

[0051] In this embodiment, a liquid level sensor is provided at the bottom wall of the storage chamber 310, and the liquid level sensor is electrically connected to the solenoid valve. The liquid level sensor is used to send a signal to the controller when the pigment level in the storage chamber 310 is lower than a preset threshold value. The controller controls the solenoid valve to replenish pigment until the pigment level is greater than or equal to the preset threshold value.

[0052] Through the above structure, the material can be replenished automatically without human intervention, thus avoiding the situation where the scraper component 350 is not painted due to insufficient paint or no paint.

[0053] In this embodiment, the scraper assembly 350 has a lead screw disposed in the slide groove 420, a scraper is matched at the lead screw, and a motor for driving the lead screw to reciprocate is disposed in the slide groove 420, so that the scraper assembly 350 can reciprocate and scrape at a uniform speed.

[0054] In this embodiment, a linear module 410 is disposed at the side wall of the frame 210 , and the cleaning assembly 250 is disposed at the moving end of the linear module 410 .

[0055] Through the above structure, the position of the cleaning component 250 can be adjusted to adapt to screens of different sizes, thereby reducing the brushing stroke and improving the application range of the device.

[0056] A keyboard cover processing technology comprises the following steps: S1, producing and obtaining a screen printing plate 230 according to the shape of the keyboard cover and the character pattern to be printed; S2. De-staticize the keyboard cover; S3, installing the screen plate with the desired printing pattern to the opening 220; S4, placing the keyboard cover to be printed on the chuck 130 at the conveyor belt 110, and the conveyor belt 110 moves step by step to the corresponding position of the screen printing plate 230; S5, the cleaning component 250 moves back and forth to apply the paint in the storage cavity 310 to the corresponding positions of the keyboard cover plate and the screen printing plate 230; S6, the conveyor belt 110 moves step by step to the corresponding position of the next screen printing plate 230, and the cleaning component 250 moves back and forth to brush the paint in the storage cavity 310 to the corresponding position of the keyboard cover and the screen printing plate 230 for a second time.

[0057] Through the above, the printing operation can be automatically and continuously performed, thereby improving the printing efficiency and printing effect. It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0058] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The embodiments shown in the embodiments are only part of the implementation methods of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the embodiments and designs a structure and an implementation method similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A keyboard cover processing technology, characterized in that: The steps include: S1, producing a screen printing plate (230) according to the shape of the keyboard cover and the character pattern to be printed; S2. De-staticize the keyboard cover; S3, installing a silk screen with a desired printing pattern at the opening (220); S4, placing the keyboard cover plate to be printed on the chuck (130) at the conveyor belt (110), and the conveyor belt (110) moves step by step to the corresponding position of the screen printing plate (230); S5, the cleaning component (250) moves back and forth to apply the paint in the storage cavity (310) to the corresponding positions of the keyboard cover plate and the screen printing plate (230); S6, the conveyor belt (110) moves stepwise to a position corresponding to the next screen printing plate (230), and the cleaning component (250) moves back and forth to apply the paint in the storage cavity (310) to the corresponding position of the keyboard cover plate and the screen printing plate (230) for a second time.

2. A keyboard cover processing technology according to claim 1, characterized in that: The process is based on a keyboard cover processing device for processing a keyboard cover. The keyboard cover processing device comprises a frame (100). A lifting assembly (140) is provided at the top wall of the frame (100). A printing mechanism (150) is provided at the telescopic end of the lifting assembly (140). The printing mechanism (150) comprises a frame (210) and a scraper assembly (350). The frame (210) has a printing cavity. A through opening (220) is formed at the bottom wall of the printing cavity. A screen printing plate (230) is detachably provided at the through opening (220). Two cleaning assemblies (250) that can move back to back or towards each other are provided in the printing cavity. A cleaning plate (580) is detachably provided between the two cleaning assemblies (250). A storage cavity (310) for storing pigment is formed between the cleaning plate (580) and the corresponding printing cavity. A slide groove (420) is formed on the side wall of the printing cavity along the length direction of the frame (210), and a scraper assembly (350) is slidably provided in the slide groove (420). The scraper assembly (350) is used to reciprocately scrape the paint in the storage cavity (310).

3. A keyboard cover processing technology according to claim 2, characterized in that: The cleaning assembly (250) comprises a mounting plate (510) slidably arranged on a side wall of a frame (210), a cylinder (550) being arranged on the side wall of the mounting plate (510), a guide groove (511) being formed on the side wall of the mounting plate (510), a fixing seat (560) being slidably arranged in the guide groove (511), the fixing seat (560) being arranged at the telescopic end of the cylinder (550), a hanging arm (570) having an opening upward for mounting a cleaning plate (580) being arranged on a side wall of the fixing seat (560), a locking buckle (590) being rotatably arranged on the hanging arm (570), and the locking buckle (590) being used to limit the cleaning plate (580).

4. A keyboard cover processing technology according to claim 3, characterized in that: A connecting block (520) is also provided at the side wall of the mounting plate (510), the connecting block (520) having an extension arm (530) extending toward the cylinder (550), an adjusting bolt (540) being rotatably provided at the extension arm (530), and a clamping portion being provided at the bottom of the adjusting bolt (540), the clamping portion being used to limit the upward travel of the fixing seat (560); An adjustment seat is rotatably provided at the top of the fixed seat (560) corresponding to the pressing portion, and fine adjustment portions with equal height intervals are formed on the top wall of the adjustment seat. The fine adjustment portions are used to cooperate with the pressing portion to form fine adjustment of the fixed seat (560).

5. The keyboard cover processing technology according to claim 3 is characterized in that: The bottom wall of the cleaning plate (580) is provided with a cleaning portion which is inclined toward one side of the corresponding receiving cavity (310), and the cleaning portion is used to contact and cooperate with the scraper assembly (350).

6. A keyboard cover processing technology according to claim 2, characterized in that: The top of the storage chamber (310) is connected to a material supply assembly (240) for providing pigments. The material supply assembly (240) comprises a material storage box (320) fixedly arranged on the top wall of the frame (210). The material storage box (320) has a containing chamber for placing pigments. A material feed port is formed at the top of the containing chamber. A cap (340) is clamped at the material feed port. The cap (340) is used to keep the containing chamber sealed. A plurality of conduits (330) are connected to the bottom of the containing chamber. The plurality of conduits (330) are all connected to the storage chamber (310). A solenoid valve is arranged at the conduit (330).

7. A keyboard cover processing technology according to claim 6, characterized in that: A liquid level sensor is provided at the bottom wall of the storage chamber (310), and the liquid level sensor is electrically connected to the solenoid valve. The liquid level sensor is used to send a signal to the controller when the pigment liquid level in the storage chamber (310) is lower than a preset threshold value, and the controller controls the solenoid valve to replenish the pigment until the pigment liquid level is greater than or equal to the preset threshold value.

8. The keyboard cover processing technology according to claim 2, characterized in that: The scraper assembly (350) comprises a lead screw arranged in a slide groove (420), a scraper plate is matched with the lead screw, and a motor for driving the lead screw to reciprocate is arranged in the slide groove (420).

9. The keyboard cover processing technology according to claim 2, characterized in that: A linear module (410) is provided at the side wall of the frame (210), and the cleaning assembly (250) is provided at the moving end of the linear module (410).

10. A keyboard cover processing technology according to claim 2, characterized in that: A conveyor belt (110) is provided on the top wall of the frame (100), a plurality of card seats (120) are provided on the top wall of the conveyor belt (110), and a card tray (130) for placing a keyboard cover is detachably provided on the card seat (120).

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