Self-service printing equipment

Abstract

The invention discloses self-service printing equipment which comprises a shell with an observation window, a temporary storage mechanism and a release mechanism, wherein the temporary storage mechanism and the release mechanism are located in the shell. The temporary storage mechanism is composed of a plurality of bearing units which are parallel to one another and inclined relative to the horizontal plane and are sequentially arranged in the normal direction of the observation window. The front bearing unit and the paper thereof shield the rear paper content area, and only the side edge serial number area is exposed. Each bearing unit is provided with a bearing plate, a holding component and a conductive bead, the release mechanism is provided with an electric contact aligned with the conductive bead, and the corresponding holding component is driven to be switched from retention to release during click conduction, so that the target paper slides out along the bearing plate. The structure realizes physical shielding of a content area and visualization of a serial number in a temporary storage stage, and supports accurate release of a single page; side edge serial numbers are exposed for a long time, so that identification and position mapping are facilitated; the number of contacts is small, wiring is easy, paper is fed according to gravity, the mistaken sorting and clamping stagnation risks are reduced, confidentiality, efficiency and reliability are improved, the structure is modularized, and maintenance is convenient and fast.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of printers, in particular to a self-service printing device. BACKGROUND

[0002] The self-service printing device generally comprises a housing, a printer module and a paper output / receiving unit. The printed paper is stacked in a horizontal or slightly inclined manner on a public tray, or is distributed to several fixed paper bins. In order to reduce information leakage, the existing solutions often use face-down stacking, add cover plates, lock paper bins, or deliver the entire document into an envelope. In order to facilitate access, there are also structures that achieve simple division through a sorter / displacement tray. However, when multiple documents are continuously queued for printing and temporarily stored in the device, the document content area may still be exposed during the waiting or sorting process. Moreover, the paper output tray is in a bulk stacking form, and cannot stably produce the arrangement effect of "effective shielding of the content of the front page to the back page and only exposing the side edge identifier" in the observation direction.

[0003] On the other hand, the existing self-service printing device generally relies on time sequence or simple position counting for the accurate release of "target page / target copy", and lacks a deterministic mapping relationship between the page side sequence number (or coding strip) and the specific bearing position. Even if some devices set identification marks on the side of the paper, they often do not establish a one-to-one gating structure with the specific bearing position, making it difficult to quickly and accurately release a single page or synchronously release a continuous page to form an entire document in the scenario of multiple parallel temporary storage. In addition, the traditional sorting / release mechanism often requires a large number of independent actuators and contacts, which are complex to connect, have high maintenance costs and poor fault tolerance. When multiple target documents need to be released simultaneously, there is a risk of mis-sorting, secondary handling or paper jam. Therefore, there is an urgent need for a self-service printing device structure that can achieve content area shielding and sequence number area visibility during temporary storage, and can complete "single page point selection release" and "continuous section linkage release" under limited contact conditions. SUMMARY

[0004] The purpose of the present application is to solve the problems of easy exposure of the content area during temporary storage of the self-service printing device and lack of one-to-one mapping between the sequence number and the bearing unit, which leads to inaccurate gating.

[0005] According to an aspect of the present application, a self-service printing device for printing a document containing a content area and a side sequence number area is provided, comprising: a housing provided with an observation window; a temporary storage mechanism arranged in the housing and composed of a plurality of bearing units arranged parallel to each other and inclined to the horizontal plane, each bearing unit being arranged in sequence along the normal direction of the observation window for supporting the document paper; When viewed along the normal direction of the observation window, the content area of the paper sheet on the adjacent carrying unit far from the observation window is shielded by the carrying unit and the paper sheet supported thereby close to the observation window, and the side edge serial number area of each paper sheet is exposed; Each carrying unit comprises a carrying plate, a retaining member and a conductive bead, which are arranged in the same carrying unit; The release mechanism is provided with an electric contact point matched with the conductive bead; when the electric contact point is in contact with any conductive bead, the retaining member of the carrying unit corresponding to the conductive bead is switched from a retaining state to a release state, the retaining state is used to block the paper sheet from sliding along the carrying plate, and the release state is used to release the paper sheet to slide along the carrying plate.

[0006] Preferably, the temporary storage mechanism is provided with a loop busbar arranged along the arrangement direction of the carrying units; each conductive bead is electrically connected to the electric actuating part of its carrying unit through an independent branch wire. A continuous section composed of a plurality of adjacent carrying units is selected along the arrangement direction of the carrying units, wherein the conductive bead of the carrying unit located at the side end close to the observation window is defined as the first end conductive bead, and the conductive bead of the carrying unit located at the side end far from the observation window is defined as the last end conductive bead; when the electric contact point is in contact with the first end conductive bead and the last end conductive bead of the continuous section at the same time, a closed power supply path is established between the two ends through the loop busbar, so that the electric actuating parts of each carrying unit in the continuous section are powered at the same time, and the retaining members thereof are switched from the retaining state to the release state at the same time, thereby realizing the linkage release of all the pages in the section.

[0007] Preferably, the release mechanism comprises a gripper mechanism arranged below the carrying unit; the gripper mechanism comprises: A claw frame fixed to the follow-up table or the base, the front end of the claw frame is provided with a matching window; A pair of gripper arms arranged in pairs, the gripper arms are pivoted to the claw frame through a hinge shaft, the inner side of the gripper arms is provided with a non-slip pad, and the outer side of the gripper arms is provided with a limiting block; The electric contact point is arranged at the free end of at least one side gripper arm, the electric contact point is assembled through an insulating seat and is electrically connected with a lead terminal, and the electric contact point is axially provided with an elastic compensation spring; A reset spring is arranged at the root of the gripper arm, so that the gripper is kept open in the release state; The electric contact point is located at the lower side of the free end of the gripper arm and is inclined upward, so as to produce a slight scraping contact when the target conductive bead is aligned and approached.

[0008] Preferably, the retaining member is provided with: A miniature electromagnetic actuating part comprising a coil framework and a coil assembly fixed to the lower side mounting seat of the carrying plate; A movable iron core which linearly reciprocates along a guide hole; a reset spring, which is a compression spring, is sleeved on the guide section of the iron core; a force transmission member, which is a yoke, an eccentric wheel or a connecting rod, is hingedly connected to one end of the movable iron core and connected to the stop body of the retaining member at the other end; a mechanical limit block is arranged at the two limit positions of the retaining member; When the electric contact is in conduction with the conductive bead, the coil is powered to attract the movable iron core, and the retaining member is switched from the retention state to the release state through the force transmission member.

[0009] Preferably, the release mechanism further comprises a displacement driving mechanism, which comprises: a linear guide, which comprises a guide rail and a sliding block arranged along the arrangement direction of the bearing unit; a follow-up platform, which is rigidly connected to the sliding block and is used for fixing the jaw mechanism; an actuator, which is a ball screw mechanism or a synchronous belt transmission mechanism matched with a stepper motor; a limit switch or a photoelectric sensor arranged at both ends of the stroke; a drag chain or a flexible wire harness guide slot for restraining the cable; The actuator drives the follow-up platform to move the jaw mechanism between a plurality of alignment positions.

[0010] Preferably, it further comprises a stack moving mechanism, which comprises: a receiving cabin, which has a paper inlet and a paper outlet and is internally provided with a supporting surface and guide ribs; a moving part, which comprises a guide and a driving member, and the receiving cabin is installed on a platform that can move along the guide; a release member, which is arranged at the bottom or the paper outlet of the receiving cabin and is in the form of a flap door or a sliding door structure and is provided with a reset spring or a reset motor; When the receiving cabin is in the delivery position, the release member opens the supporting surface to release the paper.

[0011] Preferably, the temporary storage mechanism is arranged below the movement range of the receiving cabin and is provided with a docking interface, which comprises: an alignment member, which is arranged at the paper outlet of the receiving cabin and the material inlet side of the temporary storage mechanism and is in the form of a positioning pin and a positioning hole or a tapered surface and a recess; a material guiding member, which is arranged at the material inlet side of the temporary storage mechanism and comprises a downwardly inwardly bent material guiding lip and a material guiding groove surface connected thereto.

[0012] Preferably, it further comprises a developing bin, which comprises: a metal frame; a document card slot, which is arranged in the frame and is composed of a transparent side plate and a bottom positioning stopper; A developing head mounting plate is arranged at the front side of the card slot and connected with the frame through a slide rail and a screw nut mechanism. A linear array scanner support is arranged at the side of the card slot, and an optical window or a light guide mounting position is arranged at the front side of the linear array scanner support.

[0013] Preferably, a page sequence arrangement mechanism is arranged in the developing bin, comprising: A guide member is a guide plate or a guide roller; A containing groove is a U-shaped groove body or a box-shaped groove body, and an elastic supporting plate is arranged at the bottom, and a limiting edge is arranged at the groove opening; A pressing member comprises a pressing plate mounted on a linear guide rail pair and a driving mechanism.

[0014] Preferably, the retaining member is a rotatable baffle or a liftable latch; The rotatable baffle is pivoted on the bearing plate through a hinge seat and a pin shaft; The liftable latch is guided and lifted through a linear guide sleeve, and a return spring is arranged; The retaining member is mechanically connected with an electric actuating part through a shift fork, a connecting rod or a linear push rod.

[0015] The application has the following beneficial effects: in the technical scheme, the bearing units are arranged in the direction of the normal line of the observation window at the inclination angle relative to the horizontal plane, the content area of the front page forms a stable physical shielding to the content area of the rear page, only the side sequence number area is exposed, and the effect of privacy and visibility is achieved in the temporary storage stage. The "bearing plate-retaining member-conductive bead" in each bearing unit corresponds to each other, the release mechanism is aligned with the selected conductive bead through limited electric contacts, the corresponding retaining member is triggered to switch from the retention state to the release state, and the accurate release of a single page is completed; the remaining units are not powered and remain in the retention state, and the false triggering and crosstalk are reduced. The paper slides along the bearing plate according to the gravity, the paper feeding path is simple, the friction is small, and the risk of jamming is low; the number of contacts and wiring is significantly reduced, the structure is more reliable, easy to maintain and low in cost. The side sequence number is exposed for a long time, which is convenient for identification and establishment of clear mapping with the bearing position, and supports rapid addressing and scheduling. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical schemes in the embodiments of the application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 The appearance schematic view of the self-service printing equipment according to an embodiment of the application; Figure 2The arrangement of the self-service printing equipment in the warehouse of the self-service printing equipment according to an embodiment of the present application; Figure 3 The appearance of the temporary storage mechanism of the self-service printing equipment according to an embodiment of the present application; Figure 4 The appearance of the temporary storage mechanism of the self-service printing equipment according to an embodiment of the present application; Figure 5 The appearance of the temporary storage mechanism of the self-service printing equipment according to an embodiment of the present application; Figure 4 The cross-sectional view of A-A; Figure 6 The appearance of the temporary storage mechanism of the self-service printing equipment according to an embodiment of the present application; Figure 7 The appearance of the temporary storage mechanism of the self-service printing equipment according to an embodiment of the present application; Figure 8 The appearance of the temporary storage mechanism of the self-service printing equipment according to an embodiment of the present application; Figure 9 The appearance of the temporary storage mechanism of the self-service printing equipment according to an embodiment of the present application;

[0018] BRIEF DESCRIPTION OF DRAWINGS 1000, self-service printing equipment; 100, housing; 110, observation window; 200, temporary storage mechanism; 210, bearing unit; 211, bearing plate; 212, retaining member; 213, conductive bead; 214, leading conductive bead; 215, trailing conductive bead; 216, electric actuating part; 300, paper; 310, content area; 320, side edge serial number area; 400, release mechanism; 410, electric contact; 420, jaw mechanism; 421, jaw holder; 422, jaw arm; 423, anti-slip pad; 500, stacker mechanism; 510, receiving bin; 520, moving part; 530, release piece. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0021] Reference is made to Figure 1 Figure 9 An embodiment of the present application provides a self-service printing device 1000 for printing a document containing a content area 310 and a side serial number area 320, comprising a shell 100, and a temporary storage mechanism 200 and a release mechanism 400 arranged in the shell 100, wherein The shell 100 is provided with an observation window 110; The temporary storage mechanism 200 is arranged in the shell 100 and is composed of a plurality of bearing units 210 arranged in parallel and inclined to the horizontal plane, each bearing unit 210 is arranged in sequence along the normal direction of the observation window 110, and is used for supporting a document paper 300; When observed along the normal direction of the observation window 110, the bearing unit 210 close to the observation window 110 and the paper 300 supported thereby form an obstruction to the content area 310 of the paper 300 on the adjacent bearing unit 210 far away from the observation window 110, and the side serial number area 320 of each paper 300 is exposed; Each bearing unit 210 comprises a bearing plate 211, a retaining member 212 and a conductive bead 213, and the conductive bead 213, the bearing plate 211 and the retaining member 212 corresponding to the conductive bead 213 are arranged in the same bearing unit 210; The release mechanism 400 is provided with an electric contact 410 which is aligned with the conductive bead 213; when the electric contact 410 is in contact with any conductive bead 213 to be conducted, the retaining member 212 of the corresponding bearing unit 210 of the conductive bead 213 is switched from a retaining state to a release state, the retaining state is used to block the paper 300 from sliding along the bearing plate 211, and the release state is used to release the paper 300 to slide along the bearing plate 211.

[0022] In this embodiment, it should be noted that Figures 1-9 ​The device comprises a housing 100, a temporary storage mechanism 200 and a release mechanism 400 arranged inside the housing 100. An observation window 110 is formed on the front side of the housing 100 for observing the internal arrangement along the normal direction N. The temporary storage mechanism 200 is formed by a plurality of bearing units 210 arranged in series, each bearing unit 210 is arranged in the direction N from front to back with an inclination angle a (preferably 5°-30°) in the horizontal plane. Each bearing unit 210 comprises: a bearing plate 211 rotatably mounted on a support, a retaining member 212 arranged on the bearing plate 211, and a conductive bead 213 corresponding to the bearing unit 210. The sliding direction of the bearing plate 211 is consistent with the gravity component, the retaining member 212 forms a protruding stop in the retained state to block the paper 300 from sliding down, and is withdrawn to below the paper receiving reference plane in the released state to release the paper 300. The conductive bead 213 is installed at the corresponding position of the bearing unit 210 and is electrically connected to the electric actuator 216 of the unit through an independent branch, forming a one-to-one action chain of "conductive bead 213-bearing plate 211-retaining member 212".

[0023] The geometric overlap of the bearing unit 210 is set to be greater than the projection length of the content area 310 of the paper 300 in the observation window normal direction, so that in the observation window normal direction, the front bearing unit 210 and its paper 300 stably block the content area 310 of the rear paper 300, only the side sequence number area 320 is exposed, which is convenient for identification.

[0024] The release mechanism 400 is arranged below the temporary storage mechanism 200, and a limited number of electric contacts 410 (single or paired) are installed on the alignable execution assembly. In operation, the electric contacts 410 are aligned with and in contact with the conductive bead 213 of the target bearing unit 210, the electric actuator 216 of the target unit is powered to drive the retaining member 212 to switch from the retained state to the released state, and the paper 300S slides out along the bearing plate 211 under gravity and enters the downstream working area. To ensure reliable contact, the electric contacts 410 can have elastic compensation stroke and micro scraping angle, and the conductive bead 213 can have a plated contact surface.

[0025] The electric actuator 216 is a micro drive component arranged inside each bearing unit 210, which receives the circuit signal from the conductive bead 213 and converts the electric energy into mechanical action to drive the retaining member 212 to switch between the retained state and the released state.

[0026] Further, the electric actuating part 216 comprises: an electromagnetic driving assembly, which comprises a coil bobbin fixedly installed below the bearing plate 211 and a coil winding arranged thereon; a movable iron core arranged in an axial guide hole of the coil and capable of moving linearly along the guide hole under the magnetic force when powered and being pushed back by a reset spring when powered off; a transmission mechanism connected between the movable iron core and the retaining member 212, used for converting the linear motion of the iron core into the rotating or lifting motion of the retaining member 212; the transmission mechanism can be one of a yoke, a connecting rod, an eccentric wheel or a linear push rod; and a mechanical limiting structure arranged at the end of the motion path of the retaining member 212, used for limiting the retaining position and the releasing position and ensuring the accuracy and repeatability of the state switching.

[0027] When the electric contact 410 is in contact with the target conductive bead 213, the electric current flows through the independent branch wire corresponding to the conductive bead 213 to the coil of the electric actuating part 216, the coil is powered to generate a magnetic field, the movable iron core is attracted to generate displacement, and then the retaining member 212 is switched from the retaining state to the releasing state through the transmission mechanism, so that the paper 300 can slide out along the inclined bearing plate 211.

[0028] The technical scheme of the embodiment can: form a front page shielding a rear page in the observation direction, only expose the side edge serial number area 320, realize the coexistence of content confidentiality and fast identification in the temporary storage stage; trigger the unit level action through the alignment and conduction of the conductive bead 213 and the electric contact 410, accurately release the selected page, and keep other pages retained, thereby reducing mis-sorting and cross talk; complete the page ejection by gravity, the paper feeding path is simple, the friction and jam risk is low, the structure and wiring scale are small, and the maintenance and cost are friendly; establish a determined mapping between the serial number identification and the bearing position, facilitate the upper layer control to perform positioning, addressing and scheduling, and adapt to the scene of parallel temporary storage and on-demand delivery of multiple documents.

[0029] Further, the temporary storage mechanism 200 is provided with a loop busbar arranged along the arrangement direction of the bearing unit 210; each conductive bead 213 is electrically connected to the electric actuating part 216 of the bearing unit 210 only through an independent branch wire. A continuous section composed of a plurality of adjacent bearing units 210 is selected along the arrangement direction of the bearing unit 210, wherein the conductive bead 213 of the bearing unit 210 located near the end of the side of the observation window 110 is defined as the first end conductive bead 214, and the conductive bead 213 of the bearing unit 210 located away from the end of the side of the observation window 110 is defined as the last end conductive bead 215; when the electric contact 410 is in contact with the first end conductive bead 214 and the last end conductive bead 215 of the continuous section at the same time, a closed power supply path is established between the two ends through the loop busbar, so that the electric actuating parts 216 of the bearing units 210 in the continuous section are powered at the same time, and the retaining members 212 thereof are switched from the retaining state to the releasing state synchronously, thereby realizing the linkage release of all pages in the section.

[0030] In this embodiment, it is necessary to note that the temporary storage mechanism 200 lays the circuit busbar along the arrangement direction of the bearing units 210 as a common circuit path; the conductive beads 213 of each bearing unit 210 are connected to the electric actuating part 216 of the bearing unit 210 point-to-point through independent branch wires, leading to a closed loop topology of “conductive bead 213-electric actuating part 216-busbar”. A number of adjacent bearing units 210 are selected along the arrangement direction (from close to the observation window 110 to far from the observation window 110) to form a continuous section, and the conductive bead 213 of the bearing unit 210 at the end close to the observation window 110 is defined as the leading conductive bead 214, and the conductive bead 213 of the bearing unit 210 at the end far from the observation window 110 is defined as the trailing conductive bead 215. The release mechanism 400 is configured to be in contact with the electric contact 410 and can be aligned with the leading conductive bead 214 and the trailing conductive bead 215. When the two contacts are in contact and the leading and trailing conductive beads 213 are in contact, the power supply is injected through the two ends, and the circuit busbar establishes a closed power supply path between the two ends; the electric actuating parts 216 of the bearing units 210 in the section simultaneously obtain working current, and the holding members 212 thereof are switched from the retained state to the released state, realizing the coordinated release of the entire section of pages. If only one point contacts any conductive bead 213, only the corresponding bearing unit 210 closes the circuit and releases a single page.

[0031] The circuit busbar is a common electrical circuit path laid inside the temporary storage mechanism 200 and extending along the arrangement direction of the bearing units 210. Its core function is to provide a low-impedance common return path for the electric actuating parts 216 of the plurality of bearing units 210, which is the key electrical infrastructure for realizing the “continuous section linkage release” function.

[0032] Further, the specific implementation of the circuit busbar includes: Conductor form: It is a continuous strip, rod or copper track on a printed circuit board (PCB), fixedly installed on the bracket or substrate of the temporary storage mechanism 200, and its length covers the arrangement range of all bearing units 210.

[0033] Electrical connection: One end of the electric actuating part 216 of each bearing unit 210 is connected to the circuit busbar through an independent wire, thereby forming a complete closed circuit of “power supply positive electrode-electric contact 410-conductive bead 213-branch wire-electric actuating part 216-circuit busbar-power supply negative electrode”.

[0034] Segment linkage mechanism: when a continuous segment composed of several adjacent bearing units (210) needs to be released, the paired electrical contacts 410 of the release mechanism 400 are in contact with the first and last conductive beads 214 and 215 of the segment at the same time. The current flows from the first end, through all the electrical actuating parts 216 in the segment, and finally returns to the power supply from the last end. This operation establishes a parallel power supply loop between the first and last ends, so that all electrical actuating parts 216 in the segment are powered at the same time, thereby realizing the synchronous release of the entire segment page.

[0035] It has a low resistivity to ensure that the loop voltage drop is minimal when driving multiple electrical actuating parts 216 at the same time, avoiding release failure of the last unit due to insufficient power supply. The conductor is fixed by an insulating support or coated with an insulating paint layer to ensure electrical isolation between the conductor and the metal structural parts of the equipment, preventing short circuits. The arrangement of the loop busbar makes it unnecessary to set up a complete power supply loop for each bearing unit 210 in the entire system, greatly simplifying the wiring structure. Through the ingenious design of "selecting the first and last ends and conducting the entire segment", only two electrical contacts 410 can control the coordinated action of any continuous segment, achieving efficient and reliable batch document release operation with minimal hardware cost.

[0036] The implementation of the technical solution of the embodiment can realize two release modes under the condition of limited contacts: one is single-point selection, which accurately releases the target page; the other is first and last double-point selection, which releases the segment in linkage, and completes the release of the entire segment or even the entire document at one time, with fewer actions and high efficiency. At the same time, the bearing units 210 not selected remain unpowered, maintaining the effective overlapping and shielding relationship, reducing the risk of false triggering and crosstalk, and balancing the security, reliability and wiring simplification.

[0037] Further, the release mechanism 400 includes a gripper mechanism 420 arranged below the bearing unit 210; the gripper mechanism 420 includes: a gripper frame 421 fixed to the follow-up table or base, with a positioning window at the front end; a pair of gripper arms 422 arranged in pairs and pivoted to the gripper frame 421 through a hinge shaft, with a non-slip pad 423 on the inner side of the gripper arm 422 and a limiting block on the outer side; an electrical contact 410 arranged at the free end of at least one gripper arm 422, assembled through an insulating seat and electrically connected with a lead terminal, with an elastic compensation spring on the shaft of the electrical contact 410; a reset spring arranged at the root of the gripper arm 422 to keep the gripper open in the release state; the electrical contact 410 is located below the free end of the gripper arm 422 and inclined upward, used for producing a slight scraping contact when aligned and approached with the target conductive bead 213.

[0038] In this embodiment, it is necessary to point out that the release mechanism 400 adopts the claw mechanism 420 and is arranged below the bearing unit 210. The claw mechanism 420 is composed of a claw frame 421 fixed on the follow-up table or base, and a positioning window is arranged at the front end of the claw frame 421 for guiding the coaxial alignment of the claw and the target conductive bead 213. A pair of claw arms 422 are pivotally connected to the claw frame 421 through a hinge shaft, an anti-skid pad 423 is arranged on the inner side of the claw arm 422 to provide frictional stability during contact, and a limiting block is arranged on the outer side to limit the opening and closing stroke and prevent overstroke impact. An electrical contact 410 is arranged at the free end of at least one side of the claw arm 422, the electrical contact 410 is connected to the lead terminal through an insulating seat, and an elastic compensation stroke is reserved in the axial direction to absorb the alignment error and thickness tolerance. A return spring is arranged at the root of the claw arm 422 to keep the claw open in the non-driven state. The electrical contact 410 is located on the lower side of the free end of the claw arm 422 and is inclined upward, and when the claw approaches the conductive bead 213, a slight scraping contact is formed, which is beneficial to break the oxide film and dirt and improve the conduction stability. The claw can be moved along the arrangement direction of the bearing unit 210 to complete the rapid alignment of multiple positions; during contact, the anti-skid pad 423 provides lateral support, and the limiting block suppresses overpressure, thereby ensuring the repeated accuracy and service life.

[0039] The technical scheme of the embodiment can improve the alignment accuracy and electrical contact reliability with the conductive bead 213, reduce the contact resistance and the probability of shaking and disconnection, realize the default opening and power-off self-resetting through the return spring, enhance the fault tolerance and safety, rely on the anti-skid pad 423 and the limiting block to suppress local overload and stroke overshoot, prolong the service life of the contact and the conductive bead 213, and have compact structure, high part commonality, and convenience for integration with the linear module to realize the multi-point rapid point selection and switching, and balance the efficiency, stability and maintenance cost.

[0040] Further, the retaining member 212 is provided with: a miniature electromagnetic actuator, including a coil framework and a coil assembly fixed to a mounting seat on the lower side of the bearing plate 211; a movable iron core, which moves linearly and reciprocally along a guide hole; a return spring, which is a compression spring and is sleeved on the guide section of the iron core; a force transmission member, which is a shift fork, an eccentric wheel or a connecting rod, one end of which is hingedly connected to the movable iron core, and the other end of which is connected to a stop body of the retaining member 212; a mechanical limiting block, which is arranged at two limit positions of the retaining member 212; When the electrical contact 410 and the conductive bead 213 are in conduction, the coil attracts the movable iron core to drive the retaining member 212 to switch from the retained state to the released state through the force transmission member.

[0041] In this embodiment, it is necessary to point out that the integrated miniature electromagnetic actuator in the holding member 212 is used as a driving source, the coil frame and the coil assembly are fixed on the mounting seat on the lower side of the bearing plate 211 to form a static magnetic circuit; the movable iron core is arranged in the guide hole coaxial with the coil and reciprocates linearly along the hole axis; the compression return spring is arranged on the outer periphery or the guide section of the iron core to push the iron core back to the initial end when power is off. The iron core and the holding member 212 are connected through the force transmission member, which can be a yoke, an eccentric wheel or a connecting rod, one end of which is hinged to the iron core and the other end of which is connected to the stop body of the holding member 212 to convert the linear suction stroke into the rotating or lifting stroke of the holding member 212. The mechanical limit blocks are arranged at the two limit positions of the holding member 212 to limit the retention state and the release state, avoid overstroke impact and stabilize the repeated positioning. In operation, after the electric contact 410 and the conductive bead 213 are in contact and conduct, the coil is powered to generate a magnetic field to attract the iron core to overcome the force of the return spring and move forward along the guide hole; the iron core drives the holding member 212 to switch from the retention state to the release state through the force transmission member, and the paper 300 is released to slide along the bearing plate 211; after power off, the return spring is reset, and the holding member 212 returns to the retention state, realizing the unit-level self-resetting. In order to improve the durability and consistency, a low-friction bushing can be arranged in the guide hole, a wear-resistant plating layer can be used on the contact surface of the contact / conductive bead 213, and the gap between the force transmission links can be controlled through elastic pre-tightening.

[0042] The technical scheme of the embodiment can provide compact and high-response unit-level driving, clear release action and short switching time; stable two-position positioning is realized by spring self-resetting and mechanical limiting, the repeated precision is high, and the overstroke risk is low; the conversion of electric energy-magnetic force-mechanical displacement is limited in the bearing unit 210, the wiring is simple, and the modular replacement and maintenance are facilitated; the wear and jam probability is reduced through the guidance and low-friction cooperation, and the long-term operation reliability is improved; the holding member 212 is adapted to the baffle type or the latch type, and the stroke and torque can be flexibly matched with different paper 300 weights and inclination conditions through parameters such as the number of turns of the coil, the stroke of the iron core and the force transmission ratio.

[0043] Further, the release mechanism 400 further includes a displacement driving mechanism, which includes: a linear guide, including a guide rail and a sliding block arranged along the arrangement direction of the bearing unit 210; a follow-up platform, rigidly connected with the sliding block, for fixing the jaw mechanism 420; an actuator, being a step motor cooperating with a ball screw mechanism or a synchronous belt transmission mechanism; a limit switch or an optical sensor, arranged at both ends of the stroke; a drag chain or a flexible wire harness guide groove, for restraining the cable; the actuator drives the follow-up platform to move the jaw mechanism 420 between a plurality of alignment positions.

[0044] In this embodiment, it is necessary to point out that the release mechanism 400 is provided with a displacement driving mechanism to realize multi-point positioning of the clamping jaw mechanism 420 in the arrangement direction of the bearing unit 210. The displacement driving mechanism includes a linear guide (guide rail and sliding block) arranged along the arrangement direction of the bearing unit 210, a follow-up platform rigidly connected with the sliding block, and the clamping jaw mechanism 420 fixed on the follow-up platform. The actuator adopts a stepper motor cooperating with a ball screw mechanism or a synchronous belt transmission mechanism, the motor output end is connected with the screw or the pulley through a shaft coupling, and the linear driving of the follow-up platform is realized; limit switches or photoelectric sensors are arranged at both ends of the stroke for origin resetting and over-travel protection. In order to ensure that the cable stress is controlled during movement, a drag chain or a flexible wire harness guide groove is arranged on one side of the linear guide to limit the bending radius and the movement path; a positioning reference surface and a mounting groove can be arranged on the follow-up platform to adjust the height and front-back bias of the clamping jaw mechanism 420, so as to obtain stable positioning and contact stroke under different heights and inclination angles of the bearing unit 210.

[0045] The technical scheme of the embodiment can provide high-precision linear positioning in the arrangement direction of the bearing unit 210, ensure the centering and positioning of the clamping jaw mechanism 420 and the target conductive bead 213, and improve the contact reliability; the ball screw / synchronous belt realizes the matching of speed and resolution, covers the movement requirements of "fast positioning - slow contact", reduces the impact and vibration; the limit and origin signals realize the safety boundary and repeated zero resetting, reduce the over-travel and misoperation risk; the drag chain / wire harness guide protects the follow-up cable, prolongs the service life, and is convenient for maintenance; the clamping jaw mechanism 420 is installed on the modular platform, which is convenient for assembly, calibration and replacement, and is suitable for different bearing unit 210 pitches and heights; under the premise of limited contacts, multi-point displacement positioning is realized to selectively select and select the first and last points of a section of a plurality of bearing units 210, and the electrical structure is completed to realize the linkage release of a single page or a continuous section, thereby improving the overall efficiency and reliability.

[0046] Optionally, the device further comprises a stack moving mechanism 500, which comprises: a receiving bin 510 having a paper inlet and a paper outlet, and an inner supporting surface and a guide rib; a moving part 520 comprising a guide and a driving part, and the receiving bin 510 is installed on a platform movable along the guide; a release part 530 arranged at the bottom or the paper outlet of the receiving bin 510, which is a flap door or a sliding door structure, and is provided with a reset spring or a reset motor; When the receiving bin 510 is located at the dropping position, the release part 530 opens the supporting surface to release the paper 300.

[0047] In this embodiment, it is necessary to point out that the stack moving mechanism 500 is arranged between the upstream paper feeding part and the temporary storage mechanism 200, and is used for transferring the paper 300 between multiple delivery positions. The receiving bin 510 adopts a box cavity structure, the front end forms a paper inlet, the rear end forms a paper outlet, the bottom of the cavity is provided with a supporting surface, and guide ribs are arranged on both sides to limit the paper 300 from tilting and stabilize the walking. The receiving bin 510 is installed on a carrier which can move linearly along a guide, and is sequentially aligned with each delivery position by a driving part; after being aligned, the releasing part 530 opens the supporting surface, and the paper 300 falls into the downstream working position through the paper outlet under the action of gravity, and then the releasing part 530 is reset to continue the next one. The releasing part 530 can be in the form of a flap door or a sliding door, and cooperates with a reset spring or a reset motor to realize reliable closure; the paper outlet edge of the receiving bin 510 and the supporting surface can be made into a horn mouth and a chamfer to reduce the impact of paper falling and edge scraping, and keep the posture of the paper 300 stable during the reciprocating transfer process.

[0048] The technical scheme of the embodiment can realize the rapid distribution of multiple delivery positions in a limited space, shorten the single sheet turnover time; the posture of the paper 300 is stabilized by the supporting surface and the guide rib, and the risk of paper jamming and rebound is reduced; the expected opening-closing cycle is obtained by the flap / slide door cooperating with the reset mechanism, and the self-resetting or controlled resetting ability is also provided when power is off; only a part is opened at the moment of delivery, which is convenient for forming a continuous material guiding channel with the downstream temporary storage mechanism 200, improves the paper falling accuracy and compatibility, and thus improves the sorting efficiency and operation reliability of the whole machine.

[0049] Further, the temporary storage mechanism 200 is arranged below the movement range of the receiving bin 510, and is provided with a docking interface, the docking interface comprises: An alignment part is arranged at the paper outlet of the receiving bin 510 and the material inlet side of the temporary storage mechanism 200, and is in the form of a positioning pin and a positioning hole cooperation or a tapered table and a recess cooperation; A material guiding member is arranged at the material inlet side of the temporary storage mechanism 200, and comprises a downwardly inwardly bent material guiding lip and a material guiding groove surface connected therewith.

[0050] In this embodiment, it is necessary to point out that: the temporary storage mechanism 200 is arranged below the movement range of the receiving bin 510, and a mechanical and material guiding interface is established between the two. The interface includes two types of components: first, the alignment component, which is arranged at the paper outlet end of the receiving bin 510 and the material inlet side of the temporary storage mechanism 200, respectively, and adopts the form of positioning pin and positioning hole cooperation, or taper and recess cooperation; preferably, a lead-in chamfer or round corner transition is arranged on the side of the receiving bin 510, and a micro taper angle and a guide chamfer can be arranged at the end of the positioning pin to compensate for the slight deviation in the horizontal and vertical directions and improve the centering accuracy. Second, the material guiding component is arranged at the material inlet side of the temporary storage mechanism 200 and is composed of a downwardly bent material guiding lip and a material guiding groove surface connected thereto; the material guiding lip and the paper outlet end of the receiving bin 510 form a continuous paper guiding path when they are aligned, the material guiding groove surface can be provided with corrugations or fine curved surfaces to reduce the contact area, and a buffer pad or thin-walled elastic sheet can be arranged at the groove edge to absorb instantaneous impact; if necessary, a slight slope and a dust collection groove can be arranged at the groove bottom to reduce dust accumulation.

[0051] The technical scheme of the embodiment can realize repeated and reliable alignment of the receiving bin 510 and the temporary storage mechanism 200, ensure a continuous material guiding channel between the paper outlet end and the material inlet side, reduce deviation, edge scraping and rebound during paper falling, maintain stable alignment in the presence of assembly tolerance, thermal deformation or running vibration, improve paper falling hit rate and anti-paper jam capability; the alignment component and the material guiding component are both passive simple structures, with low manufacturing and maintenance costs, easy cleaning, and improved overall reliability and maintainability.

[0052] Optionally, the device further comprises a developing bin, which comprises: a metal frame; a document card slot arranged in the frame and composed of a transparent side plate and a bottom positioning stopper; a developing head mounting plate located at the front side of the card slot and connected with the frame through a slide rail and a screw nut mechanism; a linear array scanner support located at the side of the card slot, and an optical window or a light guide component mounting position is arranged in front of the linear array scanner support.

[0053] In this embodiment, it is necessary to point out that the developing bin is set as an independent module and is fixed on a metal frame. A document card slot is formed in the frame, which is composed of a pair of transparent side plates and a bottom positioning block. The transparent side plates are used to limit the posture of the paper 300 and leave a visual channel laterally, and the positioning block provides a lower edge reference and repeated positioning. A developing head mounting plate is installed on the front side of the card slot. The mounting plate realizes front and rear / up and down fine adjustment through a slide rail and a screw-nut mechanism, and is equipped with locking parts to keep the position stable after adjustment is completed. The mounting plate can reserve an inclination fine adjustment groove to correct the angle between the optical axis and the paper surface. A linear array scanner support is arranged laterally on the card slot. An optical window or a light guide part mounting position is formed in front of the support, which is used to guide or shape the lateral illumination / imaging light path. The support is arranged in parallel with the transparent side plate of the card slot, so that the serial number area 320 of the lateral edge of the paper 300 is stably positioned in the scanning field of view. In order to suppress environmental interference, the frame and the mounting plate can be additionally provided with vibration damping pads and light shielding and dust shielding structures. The corners of the card slot are rounded and deburred to reduce the risk of edge scratching.

[0054] The technical scheme of the embodiment can realize front page alignment development and stable reading of the lateral edge serial number in a limited space. Through the transparent side plate and the positioning block, the paper 300 remains flat and consistent during development, improving the imaging clarity and repeatability. Through the slide rail and the screw fine adjustment, the developing head obtains accurate working distance and angle, which is convenient for rapid focusing and field of view calibration. The linear array scanner and the optical window (or light guide part) maintain a constant relative position with the lateral edge serial number area 320, and the lateral code reading reliability is improved. The modular frame is convenient for assembly, adjustment and maintenance, and cooperates with the upstream temporary storage shielding structure to expose only the necessary window and lateral edge code channel, taking into account the confidentiality and recognition efficiency.

[0055] Further, a page sequence arrangement mechanism is arranged in the developing bin, which comprises: a guide member, which is a guide plate or a guide roller; a containing groove, which is a U-shaped groove body or a box-shaped groove body, and is provided with an elastic supporting plate at the bottom and a limiting edge at the slot opening; a pressing member, which comprises a pressing plate mounted on a linear guide pair and a driving mechanism.

[0056] In this embodiment, it is necessary to point out that the page sequence arrangement mechanism is arranged in the downstream working area in the developing bin, including a pair of guide members, a containing groove provided with an elastic supporting plate and a limiting edge, and a pressing member installed on a linear guide pair. The guide member is a guide plate or a guide roller arranged oppositely, and a guide channel limiting the side edge of the paper 300 is formed between the two, the channel width can be adjusted by adjusting the groove or eccentric shaft, and a chamfer or a lead-in fillet is arranged at the paper inlet end to reduce the risk of edge scraping. The containing groove is a U-shaped groove body or a box-shaped groove body, and an elastic supporting plate is arranged at the groove bottom for supporting and buffering, and the supporting plate realizes the compliant stroke by a leaf spring or a spring pad; a limiting edge is arranged around the groove opening to limit the boundary of the paper 300 and provide a lateral reference. The pressing member is composed of a pressing plate installed on a linear guide pair and a driving mechanism, and the pressing plate is arranged facing the containing groove, and the working surface can be covered with an elastic coating; the driving mechanism can be a stepper motor cooperating with a ball screw or an eccentric wheel transmission, and a mechanical limit or a sensing stopper is arranged at the stroke end for implementing the pressing action in the front-back / left-right direction. After the paper is fed in, the guide member is first limited, the paper 300 is lowered to be supported by the elastic supporting plate in the containing groove, and then the pressing plate reciprocates along the guide rail to press the paper stack and complete the edge alignment and shape arrangement.

[0057] The technical scheme of the embodiment can realize the rapid lead-in, buffering support and multi-edge pressing of the entering page in the developing bin in a limited space, reduce the inclination and angle, form a page sequence stack with aligned edges and flat surfaces; improve the positioning stability of subsequent development / scanning, reduce the jamming and rebound probability; through adjustable guide and elastic supporting plate, the thickness and page number of different papers 300 are adapted, the pressing stroke and pressure are controllable, and the efficiency and consistency of the whole machine sorting and binding preparation are improved.

[0058] Optionally, the retaining member 212 is a rotatable baffle or a liftable latch; The rotatable baffle is pivoted to the carrying plate 211 through a hinge seat and a pin shaft; The liftable latch realizes guided lifting through a linear guide sleeve, and is provided with a return spring; The retaining member 212 is mechanically connected with the electric actuating part 216 through a yoke, a connecting rod or a linear push rod.

[0059] In this embodiment, it should be noted that the retaining member 212 can be either a rotatable baffle or a liftable pin. The rotatable baffle is pivotally connected to the pin shaft via a hinge seat on the support plate 211. The stop edge of the baffle extends out of the paper reference surface in the retained state to form a block, and retracts into (or below) the reference surface in the released state to allow the paper 300 to slide. A washer or bushing can be provided at the hinge to reduce wear and control the swing clearance. The liftable pin achieves axial lifting and lowering through a linear guide sleeve. The guide sleeve is fixed on the support plate 211, and the end of the pin forms a stop head to withstand the downward reaction force of the paper 300. A compression return spring is configured to return the pin to the upper stop position when the power is off or not triggered. Regardless of whether a baffle or a pin is used, it is mechanically connected to the electro-actuator 216 through a fork, connecting rod, or linear push rod to stably transmit the electromagnetic attraction displacement to the retaining member 212. Mechanical limit blocks can be used at the two extreme positions to ensure repeatable positioning and prevent overtravel. To adapt to different paper weights and tilt angles, parameter matching can be achieved by changing the length / mass distribution of the baffle arm or the stiffness and preload of the pin spring.

[0060] The technical solution implemented in this embodiment can: provide two standardized holding types to adapt to different spatial and load conditions, with a universal structure and simple assembly; achieve clear two-position action through hinge or linear guide cooperation, with high repeatability, low wear, and long service life; obtain power failure self-reset and anti-overshoot capability by means of return spring and mechanical limit, improving operational safety and fault tolerance; realize rigid force transmission chain with shift fork / linkage rod / linear push rod, with fast response and low hysteresis, and easy integration with the electric actuator 216; and facilitate rapid calibration for different paper thicknesses, sizes, and tilt angles through adjustable geometric and elastic parameters, enhancing the overall compatibility and reliability of the machine.

[0061] The following is the workflow of the self-service printing device 1000 provided in this application: "Temporary storage of obstructions—Identification and table creation—On-demand release—Job processing", specifically including the following stages: S1. Power-on self-test and home reset Displacement drive mechanism returns to zero: guide rail, slider, follower platform reset, gripper mechanism opens 420 degrees; Release mechanism 400 self-test: Electrical contact 410 elastic travel and contact resistance threshold self-test passed; Self-test of bearing unit 210: Keep component 212 in the retention state, and complete the insulation / continuity benchmark test of the conductive bead 213 circuit.

[0062] S2, Paper feed and temporary storage are arranged in rows (forming a shielding arrangement). Upstream paper supply (optional stacking mechanism 500): The receiving compartment 510 is aligned with each feeding position one by one, and the release component 530 is opened to drop the paper 300 into the target carrying unit 210. Carrying units 210 are filled in sequence along the normal direction of the observation window 110, and the angle of the carrying plate 211 is such that the paper 300 is stably positioned by gravity; Overlapping relationship establishment: the front page close to the observation window 110 blocks the content area 310 of the subsequent page, and only the side sequence number area 320 is exposed.

[0063] S3, side sequence number identification and mapping establishment The identification component reads the side sequence number of each paper; The control module generates a mapping table of "sequence number and carrying unit 210 index" as the basis for subsequent addressing and release; Dynamic maintenance of the mapping table: automatically supplement the table for new pages and automatically recycle the table entries for removed pages.

[0064] S4, release strategy and execution A, single page point selection release (accurately release a page) According to the task (sequence number or page sequence), determine the target carrying unit 210; The displacement driving mechanism aligns the gripper mechanism 420 below the unit, and the electrical contact 410 is in contact with the conductive bead 213. The electrical actuator 216 of the target carrying unit 210 is powered, the retaining member 212 is switched from retention to release, the paper 300 slides out along the carrying plate 211 under the action of gravity, and enters the downstream work area.

[0065] B, continuous section linkage release (release the entire section / portion at a time) According to the task, determine the first and last pages of the section, and correspond to the first and last conductive beads 214; The paired electrical contacts 410 of the gripper mechanism 420 are in contact with the first and last conductive beads 213 at the same time; The loop converging conductor forms a closed power supply path between the two ends, the electrical actuators 216 of the carrying units 210 in the section are powered at the same time, the retaining members 212 are released synchronously, and the entire section of pages is slid into the downstream work area at a time.

[0066] S5, work area processing (optional development and arrangement) The development bin fine-tunes the position of the first page and develops it; The line array scanner reviews the side sequence number; The page sequence arrangement mechanism imports the containing slot and performs the alignment action, and obtains a paper stack with edge alignment and surface flatness; According to business needs, subsequent binding, sealing or delivery is performed.

[0067] S6, abnormality and safety processing Alignment failure or poor contact: the displacement mechanism fine-tunes and retries, the contact resistance is out of limit and an alarm is given and the system is backed up; Paper jam / bounce back: the inlet check member and the buffer pad absorb the impact, failure triggers the clear jam process; Power off / emergency stop: the holding member 212 and the gripper return to the safe state by spring, the unselected unit continues to be retained.

[0068] S7, end and standby The unreleased page remains in the blocking arrangement; The gripper mechanism 420 returns to the origin, and the mapping table and task queue are updated; The device enters low-power standby, waiting for the next task or batch.

[0069] This process realizes physical blocking of the content area 310 in the staging phase, long-term visibility of the serial number, accurate release of single pages, and segment linkage release through the first and last points, completing multiple modes of delivery with limited contacts; The whole machine has simple wiring, reliable contact, and paper path mainly by gravity, low risk of jamming, and meets the application requirements of parallel staging and on-demand output of multiple documents.

[0070] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application should be subject to the appended claims.

Claims

1. A self-service printing apparatus for printing a document containing a content area and a side edge serial number area, characterized by, The application relates to a document temporary storage device, which comprises a shell provided with an observation window, a temporary storage mechanism arranged in the shell and composed of a plurality of bearing units arranged in parallel and inclined to a horizontal plane, each bearing unit being arranged in sequence along the normal direction of the observation window and used for bearing a document paper, when observed along the normal direction of the observation window, the bearing unit close to the observation window and the paper borne thereby shield the content area of the paper on the adjacent bearing unit far away from the observation window, and the side edge serial number area of each paper is exposed, each bearing unit comprises a bearing plate, a retaining member and a conductive bead arranged in the same bearing unit, and a releasing mechanism is provided with an electric contact point matched with the conductive bead, when the electric contact point is in contact with any conductive bead, the retaining member of the bearing unit corresponding to the conductive bead is switched from a retaining state to a releasing state, the retaining state is used for blocking the paper from sliding along the bearing plate, and the releasing state is used for releasing the paper to slide along the bearing plate. The temporary storage mechanism is provided with a loop busbar arranged along the arrangement direction of the bearing units, each conductive bead is electrically connected with the electric actuating part of the bearing unit through an independent branch wire, a continuous section composed of a plurality of adjacent bearing units is selected along the arrangement direction of the bearing units, the conductive bead of the bearing unit located at the side end close to the observation window is defined as a first end conductive bead, and the conductive bead of the bearing unit located at the side end far away from the observation window is defined as a last end conductive bead, when the electric contact point is in contact with the first end conductive bead and the last end conductive bead of the continuous section at the same time, a closed power supply path is established between the two ends through the loop busbar, the electric actuating parts of the bearing units in the continuous section are supplied with electricity at the same time, the retaining members of the bearing units are switched from the retaining state to the releasing state synchronously, and thus the linkage releasing of all the pages in the section is realized. The releasing mechanism comprises a clamping jaw mechanism arranged below the bearing units, the clamping jaw mechanism comprises a jaw frame fixed on a follow-up table or a base and provided with a matching window at the front end, a pair of clamping jaw arms arranged in pairs and pivoted to the jaw frame through a hinge shaft, a non-slip pad arranged on the inner side of the clamping jaw arm, and a limiting block arranged on the outer side of the clamping jaw arm, the electric contact point is arranged at the free end of at least one clamping jaw arm, assembled through an insulating seat and electrically connected with a lead terminal, and the electric contact point is axially provided with an elastic compensation spring piece, a reset spring is arranged at the root of the clamping jaw arm, and the clamping jaw is kept open in the releasing state, and the electric contact point is located at the lower side of the free end of the clamping jaw arm and inclined upward, used for producing a micro-scratching contact when matched with the target conductive bead. The retaining member is internally provided with a miniature electromagnetic actuating part comprising a coil framework and a coil assembly fixed on the lower side mounting seat of the bearing plate, a movable iron core linearly reciprocating along a guide hole, a reset spring which is a compression spring and is sleeved on the guide section of the iron core, a force transmission member which is a shift fork, an eccentric wheel or a connecting rod, one end of which is hinged to the movable iron core and the other end of which is connected with a stop body of the retaining member, and a mechanical limiting block arranged at the two limit positions of the retaining member. ​ ​ 2. The self-service printing device of claim 1, wherein, ​ ​ 3. The self-service printing device of claim 1, wherein, ​ ​ ​ ​ ​ ​ ​ 4. The self-service printing device of claim 3, wherein, ​ ​ ​ ​ ​ ​ When the electric contact is in conduction with the conductive bead, the coil is powered to attract the movable iron core, and the holding member is switched from the retaining state to the releasing state through the force transmission member.

5. The self-service printing device of claim 4, wherein, The releasing mechanism further comprises a displacement driving mechanism, which comprises: A linear guide comprises a guide rail and a sliding block arranged along the arrangement direction of the bearing unit; A follow-up platform is rigidly connected to the sliding block and is used to fix the jaw mechanism; An actuator is a stepper motor cooperating with a ball screw mechanism or a synchronous belt transmission mechanism; Limit switches or photoelectric sensors are arranged at both ends of the stroke; A drag chain or a flexible wire harness guide slot is used to constrain the cable; The actuator drives the follow-up platform to move the jaw mechanism between multiple alignment positions.

6. The self-service printing device of claim 1, wherein, It also includes a stack moving mechanism, which comprises: A receiving cabin has a paper inlet and a paper outlet, and an inner supporting surface and guide ribs are arranged inside; A moving part comprises a guide and a driving part, and the receiving cabin is installed on a platform that can move along the guide; A release part is arranged at the bottom or the paper outlet of the receiving cabin, and is a flap door or a sliding door structure, and is provided with a return spring or a return motor; When the receiving cabin is in the delivery position, the release part opens the supporting surface to release the paper.

7. The self-service printing device of claim 6, wherein, The temporary storage mechanism is arranged below the movement range of the receiving cabin and is provided with a docking interface, which comprises: An alignment part is arranged at the paper outlet of the receiving cabin and the material inlet side of the temporary storage mechanism, and is a positioning pin and a positioning hole cooperation or a cone and a recess cooperation; A material guiding member is arranged at the material inlet side of the temporary storage mechanism, which comprises a downwardly inwardly bent material guiding lip and a material guiding groove surface connected thereto.

8. The self-service printing device of claim 1, wherein, It also includes a developing bin, which comprises: A metal frame; A document card slot is arranged in the frame and is composed of a transparent side plate and a bottom positioning stopper; A developing head mounting plate is located in front of the card slot and is connected to the frame through a slide rail and a screw nut mechanism; A linear array scanner support is located beside the card slot, and an optical window or a light guide part mounting position is arranged in front of it.

9. The self-service printing device of claim 8, wherein, The developing bin is provided with a page sequence arrangement mechanism, which comprises: A guide member is a guide plate or a guide roller; A containing groove is a U-shaped groove body or a box-shaped groove body, and the bottom is provided with an elastic supporting plate, and the groove opening is provided with a limiting edge; A pressing member comprises a pressing plate mounted on a linear guide rail pair and a driving mechanism.

10. The self-service printing device of claim 1, wherein, The holding member is a rotatable baffle or a liftable latch; The rotatable baffle is pivoted to the bearing plate through a hinge seat and a pin shaft; The liftable latch is guided and lifted through a linear guide sleeve, and is provided with a return spring; The holding member is mechanically connected to the electric actuating part through a shift fork, a connecting rod or a linear push rod.

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