CN218084778U - Printing medium tensioning device and printing device - Google Patents

Abstract

The utility model belongs to the technical field of printing equipment, a printing medium overspeed device tensioner and printing device is disclosed, the printing medium overspeed device tensioner includes the bed frame, the roll-up mechanism, straining device and friction mechanism, the bed frame has the paper feed passageway, the roll-up mechanism roll-up has the printing medium and is used for carrying the printing medium to the paper feed passageway, straining device includes hold-down part, hold-down part presses in the printing medium in the activity process, friction mechanism includes the first friction part that can respond to the activity of hold-down part and move about and the second friction part that rotates along with the roll-up mechanism in step, the first friction part can change in the process of responding to the hold-down part with the contact pressure of second friction part with the speed that the roll-up mechanism rolled up the printing medium of changing correspondingly; the printing device comprises a printing module and the printing medium tensioning device. The utility model provides a printing medium overspeed device tensioner and printing device, the inertia that effectively reduces the printing medium makes the printing medium remain stable output to the interference of printing.

Description

Printing medium tensioning device and printing device

Technical Field

The utility model relates to a printing apparatus technical field especially relates to a printer overspeed device tensioner and printing device.

Background

The printer that needs to be used to roll up formula consumptive material such as label printing usually comes the roll-up consumptive material through setting up a paper spool, and the consumptive material can be rolled up in order to realize the printing process to the roll-up paper spool when printer prints. In the prior art, the winding shaft can be set to be fixed or rotary. When setting up to fixed paper reel, drive the consumptive material by the power roller and march when printing, the consumptive material drags the scroll again and rotates on the paper reel, because the paper reel is fixed, can produce certain friction, the certain power of loss printer between the dabber and the scroll axle of paper reel rotation in-process scroll. In addition, when printing is started, because the paper roll is in a static state, when consumable materials advance forwards, the rotational inertia of the paper roll and the friction force between the paper roll core shaft and the paper roll shaft need to be overcome in a short time to drive the paper roll to rotate, the paper roll can be subjected to large advancing resistance, the stepping motor is easy to step out, printing compression is caused, and even the stepping motor stops to cause printing abnormity. When printing is stopped, the paper roll can continuously rotate for a certain angle under the inertia of the paper roll, so that redundant consumables with a certain length can be released, and the consumables are wasted; when setting up to the paper reel of rotary type, the release rate that the printing in-process will guarantee the consumptive material is unanimous with printing speed, needs the external diameter of real-time detection scroll, and structure and control process all become more complicated like this, and the paper reel also has the inertia problem of scroll when the beginning is printed and is stopped printing, influences the printing effect.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a print tensioning medium and printing device to solve among the prior art printer because self disturbance or acceleration and deceleration are to the interference of printing the medium when printing.

To achieve the purpose, the utility model adopts the following technical proposal:

a print media tensioning device comprising:

a base frame having a paper feed passage;

a winding and unwinding mechanism disposed on the base frame, the winding and unwinding mechanism winding a printing medium and feeding the printing medium to the paper feeding path; and

a tensioning mechanism including a pressing member movably supported on the base frame, the pressing member configured to press against the print medium during movement;

a friction mechanism disposed between the tensioning mechanism and the reel-out mechanism, the friction mechanism comprising:

a first friction member movable in response to movement of the hold down member; and

the second friction component is arranged on the rolling and releasing mechanism and synchronously rotates along with the rolling and releasing mechanism;

the first friction part can be movably contacted with the second friction part, and the first friction part can change the contact pressure with the second friction part in the process of moving in response to the movement of the pressing part so as to correspondingly change the speed of the rolling and releasing mechanism for rolling and releasing the printing medium.

Optionally, the first friction member comprises a friction assembly configured to be able to approach or move away from the second friction member and press against the second friction member during approach thereto.

Optionally, the first friction member includes a movable member, a friction plate, and a friction plate holder, and the friction plate is swingably connected to the movable member via the friction plate holder so as to be able to swing with respect to the second friction member to increase or decrease a contact area with the second friction member.

Optionally, a limiting groove is formed in the friction plate support, a limiting column is correspondingly arranged on the movable part, and the limiting column slides in the limiting groove.

Optionally, the friction assembly further comprises a first elastic member, the first elastic member is capable of providing a first application force to the friction assembly, so that the friction assembly overcomes the first application force of the first elastic member during the process of approaching the second friction member, and the friction assembly moves relative to the second friction member to change the contact area between the friction assembly and the second friction member.

Optionally, the first friction member includes a first swing member swingably provided on the base frame, and the first swing member is swingable relative to the second friction member under the urging of the pressing member so that the friction assembly can move toward or away from the second friction member.

Optionally, the first friction component comprises a moving member movably disposed on the base frame, and the moving member can move relative to the base frame under the driving of the pressing component, so that the friction assembly can move close to or away from the second friction component.

Optionally, the pressing device comprises a control device and a driving part, the driving part can drive the movable part to move, the control device is electrically connected with the driving part, and the control device is used for acquiring the state or position of the pressing part so that the driving part controls the movable part to approach or separate from the second friction part;

wherein the control device comprises a sensing assembly for acquiring the state or position of the pressing part.

Optionally, the pressing part comprises:

a pressing roller for pressing the printing medium;

the second swinging part is movably supported on the base frame, the press roller is arranged on the second swinging part, and the second swinging part can drive the first swinging part to move relative to the second friction part.

Optionally, the first friction component further comprises a second elastic element, and the second elastic element is used for driving the first swing element to reset.

Optionally, the tensioning mechanism further comprises a third resilient member configured to provide a second applied force to the second rocker to press the platen against the print media.

A printing device is characterized by comprising a printing module and the printing medium tensioning device, wherein the printing module is supported on the base frame, and the paper feeding channel is formed between the rolling and unrolling mechanism and the printing module.

Optionally, the printing device further comprises a detection component configured in the paper feeding channel, and the detection component is configured to transmit a detection signal to the printing medium and receive a position signal fed back by the printing medium.

Has the advantages that:

the utility model provides a printing medium overspeed device tensioner, when being applied to printing device on, straining device's setting can make printing medium keep the tensioning state, and can make printing medium output stable under the combined action that compresses tightly part and friction mechanism, and first friction part can contact with second friction part activity, and change the contact pressure of putting the mechanism book with the correspondence change in the in-process of activity and second friction part in response to the activity that compresses tightly the part and put the speed of printing medium, effectively reduce when printing the start, when printing device appears the disturbance in the printing process, when printing speed changes and when printing stops, the inertia of printing medium is to the interference of printing, make the printing medium can keep the steady output, avoid the printing medium appearance condition of overshooting, also can guarantee to print the effect.

Drawings

FIG. 1 is a schematic view of a printing medium tensioning device according to the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a schematic view of the force applying member of the present invention just beginning to contact the first rocker member;

fig. 4 is a partial enlarged view of fig. 3B according to the present invention;

FIG. 5 is a schematic structural view of the printing medium tensioning device of the present invention with balanced force;

fig. 6 is a partial enlarged view of fig. 5C according to the present invention;

FIG. 7 is a schematic structural view of the friction plate of the present invention releasing the second friction member;

figure 8 is an enlarged view of a portion of figure 7 at D according to the present invention;

fig. 9 is a schematic view of a partial structure of the printing apparatus of the present invention;

fig. 10 is a schematic structural view of a mounting position of a winding and unwinding mechanism of the printing apparatus according to the present invention.

In the figure:

100. a reel-to-reel mechanism; 110. a reel; 111. a first swing member; 120. a rotating shaft;

200. a pressing member; 210. a compression roller; 220. a second swing member; 230. a force application member; 240. a third elastic member;

310. a first friction member; 311. a first swing member; 3111. a limiting post; 312. a friction plate; 313. a friction plate support; 3131. a limiting groove; 314. a first elastic member; 315. a second elastic member; 320. a second friction member;

400. a frame; 410. a printing module; 420. a detection section; 430. and a bearing.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used based on the orientations and positional relationships shown in the drawings, and are only for convenience of description and simplification of operation, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

The present embodiment provides a printing apparatus, as shown in fig. 1, 2, and 9, the printing apparatus includes a frame 400 and a printing module 410 disposed on the frame 400, the frame 400 further includes a printing medium tensioning device, the printing medium tensioning device includes a base frame, a winding and unwinding mechanism 100, a tensioning mechanism, and a friction mechanism, wherein the base frame has a paper feeding path, the winding and unwinding mechanism 100 is disposed on the base frame and takes up the printing medium and transports the printing medium to the paper feeding path, the tensioning mechanism includes a pressing member 200 movably supported on the base frame, the printing module 410 is supported on the base frame, the base frame is connected to the frame 400 of the printing apparatus, the paper feeding path is formed between the winding and unwinding mechanism 100 and the printing module 410, the pressing member 200 is configured to press against the printing medium during movement, the friction mechanism is disposed between the tensioning mechanism and the winding and unwinding mechanism 100, the friction mechanism includes a first friction member 310 and a second friction member 320, wherein the first friction member 310 is movable in response to movement of the pressing member 200, the second friction member 320 is configured on the winding and rotates synchronously with the winding and with the unwinding mechanism 100, and the first friction member 320 is configured to change a contact force of the second friction member 320 during movement of the second friction member 320.

The reel-and-reel mechanism 100 is rotatably connected to the frame 400, the second friction member 320 is preferably provided as a friction disc and rotates synchronously with the reel-and-reel mechanism 100, and the tension mechanism and the first friction member 310 are both swingably provided on the frame 400. When the printing device is printing, the printing module 410 drives the printing medium to advance along the direction of the paper feeding path, in the process, the winding and unwinding mechanism 100 conveys the printing medium, and the tensioning mechanism presses against the printing medium, i.e. tensions the printing medium on the paper feeding path. Through the combined action of the pressing part 200 and the friction mechanism, the output of the printing medium can be stable, the first friction part 310 can be in movable contact with the second friction part 320, and the contact pressure with the second friction part 320 is changed in the process of moving in response to the movement of the pressing part 200 so as to correspondingly change the speed of releasing the printing medium by the winding and unwinding mechanism 100, so that the interference of the inertia of the printing medium on printing when the printing device is started, disturbed during the printing process, the printing speed is changed and the printing is stopped can be effectively reduced, the stable output of the printing medium can be kept, the overshoot condition of the printing medium can be avoided, and the reliability and effectiveness of the printing process can be ensured.

The first friction member 310 includes a friction assembly configured to be able to approach or move away from the second friction member 320 and press against the second friction member 320 in the process of approaching the second friction member 320. By controlling the friction assembly to press against the second friction member 320 in the process of approaching the second friction member 320, a friction force can be provided to the second friction member 320, and the magnitude of the friction force can be adjusted according to the magnitude of the pressure of the friction assembly pressing against the second friction member 320, so as to control the speed of the rolling and releasing mechanism 100 for rolling and releasing the printing medium.

The first friction member 310 includes a first swing member 311 swingably provided on the base frame, and the first swing member 311 can swing with respect to the second friction member 320 by the pressing member 200 so that the friction assembly can move toward or away from the second friction member 320. Alternatively, the first swing member 311 may be pivotally disposed on the base frame, and the first swing member 311 may be pivotally moved relative to the second friction member 320 by the pressing member 200, so that the friction assembly can move toward or away from the second friction member 320. The driving of the pressing member 200 to the first swing member 311 enables the first swing member 311 to swing relative to the base frame, so that the friction assembly can move closer to or away from the second friction member 320, and further the friction force applied to the second friction member 320 is controlled when the friction assembly presses against the second friction member 320, thereby controlling the speed of the rolling and releasing mechanism 100 rolling and releasing the printing medium. Preferably, the first swing portion 311 and the base frame can swing relatively by a hinge.

Further, the friction assembly includes a friction plate 312, the friction plate 312 is swingably coupled to the first swing member 311 by a friction plate bracket 313, and the friction plate 312 can swing with respect to the second friction member 320 to increase or decrease a contact area with the second friction member 320. In this embodiment, the friction plate 312 is disposed on the friction plate support 313, and the friction plate support 313 is swingably connected to the first swing member 311, that is, the friction plate support 313 can rotate relative to the first swing member 311, and when the contact area between the friction plate 312 and the second friction member 320 is increased, the contact friction between the friction plate 312 and the second friction member 320 is increased; when the contact surface between the friction plate 312 and the second friction member 320 is reduced, the contact friction between the friction plate 312 and the second friction member 320 is reduced.

Further, the friction assembly further comprises a first elastic member 314, wherein the first elastic member 314 is capable of providing a first applying force to the friction assembly, so that the friction assembly overcomes the first applying force of the first elastic member 314 during the process of approaching the second friction member 320, and the friction assembly moves relative to the second friction member 320 to change the contact area between the friction assembly and the second friction member 320. In this embodiment, one end of the first elastic member 314 is connected to the first swing portion 311, the other end of the first elastic member 314 is connected to the friction plate support 313, and the arrangement of the first elastic member 314 provides a first applying force to the friction plate 312 disposed on the friction plate support 313, so that the friction plate 312 overcomes the first applying force of the first elastic member 314 to swing relative to the first swing portion 411 during the process of approaching the second friction member 320, that is, the angle of the friction plate 312 relative to the second friction member 320 changes, that is, the contact area between the friction plate 312 and the second friction member 320 changes. Specifically, when the first swing member 311 swings away from the second friction member 320, the friction assembly moves away from the second friction member 320, the first applying force of the first elastic member 314 decreases, i.e. the contact area between the friction plate 312 and the second friction member 320 decreases, and the friction force applied to the second friction member 320 decreases; when the first swing member 311 swings toward the second friction member 320, the friction assembly moves toward the second friction member 320, the first applying force of the first elastic member 314 increases, i.e., the contact area between the friction plate 312 and the second friction member 320 increases, and the friction force applied to the second friction member 320 increases.

The pressing member 200 includes a pressing roller 210 and a second swing member 220, wherein the pressing roller 210 is used for pressing the printing medium, the second swing member 220 is movably supported on the base frame, the pressing roller 210 is disposed on the second swing member 220, and the second swing member 220 is movable to drive the first swing member 311 to move relative to the second friction member 320. In this embodiment, the pressing roller 210 is disposed at one end of the second swing portion 220, the force applying member 230 is disposed at one end of the second swing portion 220 away from the pressing roller 210, the force applying member 230 is swingably disposed on the base frame and can move synchronously with the second swing portion 220, the second swing portion 220 can drive the force applying member 230 to swing synchronously, and the force applying member 230 can swing to drive the first swing portion 311 to move relative to the second friction member 320.

As shown in fig. 1 to 2, when the printing apparatus is at rest, the friction plate 312 abuts against the second friction member 320 under the elastic force of the first elastic member 314, and the contact friction force of the friction plate 312 against the second friction member 320 can keep the reel-and-reel mechanism 100 at rest and avoid rotation. The printing module 410 includes a power roller, when the printing apparatus is in operation, the power roller can pull the printing medium along the direction of the paper feeding path, and the friction plate 312 is pressed against the second friction member 320 by the first elastic member 314, so that the winding and unwinding mechanism 100 cannot rotate freely at this time. In this case, the pressing roller 210 pressing against the printing medium drives the second swing member 220 to swing upward under the action of the pulling force of the printing medium, the second swing member 220 swings upward to drive the force applying member 230 connected thereto to swing synchronously, in this embodiment, the force applying member 230 is a cam, when the force applying member 230 rotates to the position shown in fig. 3 to 4, that is, the force applying member 230 contacts with the first swing member 311, and then the force applying member 230 can lift the first swing member 311 upward as the force applying member 230 continues to swing upward. While the first swing member 311 swings upward, the friction plate holder 313 rotates to the first swing member 311 by the first elastic member 314 and continues to abut against the second friction member 320. Specifically, the friction plate support 313 is provided with a limiting groove 3131, the first swing part 311 is correspondingly provided with a limiting post 3111, the limiting post 3111 slides in the limiting groove 3131, and the limiting post 3111 slides in the limiting groove 3131 in the process that the friction plate support 313 rotates in the first swing part 311. In the process of the first swing member 311 swinging upward, when the friction plate support 313 rotates relative to the first swing member 311 to a position where the stopper post 3111 abuts against the groove wall of the stopper 3131, as shown in fig. 5 to 6, the first swing member 311 swings upward to drive the friction plate support 313 to swing upward together, i.e. the friction plate 312 and the second friction member 320 gradually move away from each other, thereby reducing the pressure of the friction plate 312 on the second friction member 320, and simultaneously reducing the friction force of the friction plate 312 on the second friction member 320, i.e. reducing the rotation resistance of the winding and unwinding mechanism 100. Then, the first swing part 311 continues to swing upwards, when the resultant force of the pressure of the friction plate 312 on the second friction member 320 and the friction force of the friction plate 312 on the second friction member 320 is reduced to the pulling force of the power roller on the printing medium, that is, the rotation resistance of the winding and unwinding mechanism 100 is equal to the pulling force of the power roller on the printing medium, the power roller pulls the printing medium, that is, the winding and unwinding mechanism 100 starts to rotate to release the printing medium, at this time, the whole printing medium supply system is in a dynamic balance state, thereby ensuring that the winding and unwinding mechanism 100 can release the printing medium stably.

When the printing device is disturbed in some situations during the supply of the printing medium, so that the rotational resistance of the winding and unwinding mechanism 100 is increased, under the condition that the tension of the power roller on the printing medium is not changed, the printing medium drives the pressure roller 210 to control the second swing member 220 to swing upwards, so that the force application member 230 continues to lift the first swing member 311 upwards, and further the friction plate support 313 on the first swing member 311 swings upwards to move in a direction away from the second friction member 320, thereby reducing the pressure of the friction plate 312 on the second friction member 320 and the friction force of the friction plate 312 on the second friction member 320, and balancing the rotational resistance of the winding and unwinding mechanism 100 with the tension of the power roller on the printing medium again, i.e. the whole printing medium supply system can reach a dynamic balance state again.

When the printing apparatus disturbs in the process of supplying the printing medium to reduce the rotation resistance of the winding and unwinding mechanism 100, under the condition that the tension of the power roller to the printing medium is not changed, the second swing part 220 swings downward, so that the first swing part 311 driven by the force applying part 230 also swings downward, the friction plate support 313 on the first swing part 311 swings downward to move in the direction close to the second friction part 320, the friction plates 312 can press against the second friction part 320 more, the pressure of the friction plates 312 to the second friction part 320 and the friction force of the friction plates 312 to the second friction part 320 can be increased, the rotation resistance of the winding and unwinding mechanism 100 is balanced with the tension of the power roller to the printing medium again, and the whole printing medium supplying system can reach a dynamic balance state again.

When the printing speed of the printing device is increased in the printing process, the power roller increases the pulling force on the printing medium, but the rotational speed of the rolling mechanism 100 is not increased due to inertia, which is equivalent to that the pulling force of the power roller on the printing medium is greater than the rotational resistance of the rolling mechanism 100, at this time, the printing medium drives the pressure roller 210 to control the second swing member 220 to swing upwards, so that the force application member 230 continues to lift the first swing member 311 upwards, and further the friction plate support 313 on the first swing member 311 swings upwards to move away from the second friction member 320, and further the pressure of the friction plate 312 on the second friction member 320 and the friction force of the friction plate 312 on the second friction member 320 can be reduced, so that the rolling mechanism 100 accelerates to release the printing medium, and then the second swing 220 swings downwards, so that the first swing member 311 swings downwards together with the first swing member 313 to move towards the second friction member 320, so that the friction plate 312 can press against the second friction member 320 more, and the rotational resistance of the rolling mechanism 100 and the power roller on the printing medium can reach a balance again, i.e. a dynamic state of the printing medium supply system is balanced.

When the printing speed is reduced during the printing process of the printing apparatus, the power roller reduces the pulling force on the printing medium, but the rolling mechanism 100 does not reduce its own rotation speed due to inertia, which is equivalent to that the pulling force of the power roller on the printing medium is smaller than the rotation resistance of the rolling mechanism 100, at this time, the second swing member 220 will swing downward, so that the first swing member 311 driven by the force applying member 230 also swings downward together, and the friction plate support 313 on the first swing member 311 swings downward to move in a direction close to the second friction member 320, so that the friction plate 312 can press against the second friction member 320 more, and further the pressure of the friction plate 312 on the second friction member 320 and the friction force of the friction plate 312 on the second friction member 320 can be increased, so that the rolling mechanism 100 slows down the speed of releasing the printing medium, and then the printing medium will pull the pressure roller 210 again to control the second friction member 220 to swing upward, so that the force applying member 230 continues to lift the first swing upward, and further the friction plate support 313 on the first swing upward to move in a direction far from the second friction member 320, and then the friction plate support 313 on the second friction member can balance the dynamic state of the friction member and the friction roller 320, so that the friction force of the friction plate support 312 and the friction member can be supplied to the friction member 320.

When the printing device finishes printing tasks and stops printing, the power roller stops pulling the printing medium, the winding and unwinding mechanism 100 continues to rotate under the action of inertia to release the printing medium, at this time, the printing medium also loses acting force on the press roller 210, so that the second swing member 220 swings downwards under the action of gravity, the force applying member 230 also releases the driving action on the first swing member 311, so that the first swing member 311 also swings downwards, the friction plate support 313 connected with the first swing member 311 moves towards the direction close to the second friction member 320 and abuts against the second friction member 320 again, in the process, the pressure of the friction plate 312 on the second friction member 320 and the friction force of the friction plate 312 on the second friction member 320 are continuously increased, the rotation speed of the winding and unwinding mechanism 100 is gradually slowed until the winding and unwinding mechanism 100 stops rotating, the state shown in fig. 1 to 2 is returned again, the friction plate 312 presses the second friction member 320 under the action of the first elastic member 314, and the whole printing system stops working.

The first friction member 310 further includes a second elastic member 315, and the second elastic member 315 is used for driving the first swing member 311 to return. Through setting up second elastic component 315, when the printing medium removed the effort to compression roller 210, first goods of furniture for display rather than for use 311 resets under the elastic reaction of second elastic component 315, has avoided first goods of furniture for display rather than for use 311 to swing the not smooth condition under the condition that only receives gravity, makes the swing of resetting of first goods of furniture for display rather than for use 311 more reliable smooth and easy.

The tensioning mechanism further includes a third elastic member 240, and the third elastic member 240 can provide a second applied force to the second swing member 220 to press the pressing roller 210 against the printing medium. The third elastic member 240 is provided to allow the pressing roller 210 to be reliably pressed against the printing medium, thereby ensuring smooth printing. In addition, when the printing medium releases the acting force on the pressing roller 210, the second swing part 220 is reset under the elastic action of the third elastic member 240, thereby preventing the second swing part 220 from swinging unsmoothly under the condition of only gravity, and ensuring that the reset swinging of the second swing part 220 is more reliable and smooth.

As shown in fig. 10, the winding and unwinding mechanism 100 includes a winding shaft 110 and a rotating shaft 120, the winding shaft 110 is used for winding a printing medium, the winding shaft 110 is sleeved on the rotating shaft 120, the rotating shaft 120 is fixedly connected to the winding shaft 110 through a connecting member, and the winding shaft 110 and the rack 400 and the rotating shaft 120 and the rack 400 are connected through bearings 430, so that the rotation effectiveness and reliability of the winding and unwinding mechanism 100 can be ensured. When one end of the printing medium needs to be removed during the trial and exchange of the printing medium on the printing apparatus, in order to effectively use the printing medium, the empty printing medium is generally rewound to the rewinding mechanism 100 for formal use. In this embodiment, as shown in fig. 7 to 8, in the process of rewinding the empty printing medium, the second swing member 220 may be controlled to swing upward and lift up to enable the force applying member 230 to drive the first swing member 311 to swing, so as to completely separate the friction plate 312 from the second friction member 320, and then the rotating shaft 120 is controlled to rotate in reverse to drive the winding shaft 110 to synchronously rotate in reverse, so as to conveniently and easily rewind the empty printing medium onto the winding shaft 110.

Referring to fig. 9, the printing apparatus further includes a detecting component 420 disposed in the paper feeding path, wherein the detecting component 420 is configured to transmit a detecting signal to the printing medium and receive a position signal fed back from the printing medium. In this embodiment, the print module 410 is located at a downstream position of the detecting component 420, the detecting component 420 is preferably configured as a photoelectric detection device, the detecting component 420 detects a position of the print medium by emitting a detecting signal to the print medium and receiving a print medium position signal, and when the detecting component 420 detects that the print medium has reached the print position, the print module 410 starts to print the print medium, so as to ensure smooth completion of the print process. The detecting component 420 may be other devices for detecting position signals, such as a position sensor and a touch sensor, besides the photoelectric detection device, and is not limited herein.

Unlike the above-mentioned embodiment, in an embodiment, the first friction component 310 includes a moving member (not shown) movably disposed on the base frame, the moving member is movably hinged or movably connected to the first swing member 311, and when the printing medium drives the first swing member 311 to swing, the moving member can move relative to the base frame under the driving of the first swing member 311, and the moving direction enables the friction component to slide in a direction towards the winding and unwinding mechanism 100, so that the friction component can move too close to or away from the second friction component 320. In this embodiment, the pressing member 200 moves relative to the base frame and drives the moving member, so as to push the moving member to move relative to the base frame, so that the moving member drives the friction assembly to move toward or away from the second friction member 320 during the moving process, and further, the friction force of the friction assembly pressing against the second friction member 320 can be adjusted to control the speed of the rolling and releasing mechanism 100 for rolling and releasing the printing medium. The functions and effects not mentioned in this embodiment can be combined with the contents of the above embodiments, and are not described herein again.

Unlike the above embodiments, in one embodiment, the first friction component 310 further includes a driving component, a movable component and a friction plate 312, the driving component can drive the movable component to move, the friction plate 312 is disposed on the movable component, the control component is electrically connected to the driving component, and the control component is configured to obtain a state and a position of the pressing component 200, so that the driving component controls the movable component to correspondingly drive the friction plate 312 to approach or move away from the second friction component 320, wherein the control component includes a sensing assembly configured to obtain the state or the position of the pressing component 200. Specifically, the control device comprises a processor and a memory, wherein the memory stores an executable printing program, and the processor executes the printing program to realize that:

position information or state information of the pressing member 200 is acquired. The position information is sensed by a photoelectric pair, a hall sensor, or the like, and the position information and the state information of the pressing member 200 are fed back. The state information includes a swing speed of the pressing member 200, or a pressure between the pressing member 200 and the printing medium, or a pressure between the pressing member 200 and the base frame.

And controlling the driving member to operate according to the position information or the state information, wherein the driving member drives the movable member to move and drive the movable member to approach or move away from the second friction member 320, so that the movable member drives the friction plate 312 to approach or move away from the second friction member 320.

The method of the present embodiment is applied to the printer of any one of the above embodiments, so as to achieve the effect of adjusting the friction force of the friction component pressing against the second friction member 320 to control the speed of the rolling and releasing mechanism 100 for rolling and releasing the printing medium. The movable position and the state of the pressing part 200 correspond to the tensioning degree of the printing medium in the corresponding position and state one by one, and the sensing assembly electrically connected with the driving part in the control device can acquire position signals or state signals of the pressing part 200 in different positions in real time and send the corresponding position signals and state signals to the driving part in real time. The functions and effects not mentioned in this embodiment can be combined with the contents of the above embodiments, and are not described herein again.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (13)

1. A print media tensioning device, comprising:

a base frame having a paper feed passage;

a winding and unwinding mechanism (100) disposed on the base frame, the winding and unwinding mechanism (100) winding a printing medium and feeding the printing medium to the paper feeding path;

a tensioning mechanism comprising a pressing member (200) movably supported on the base frame, the pressing member (200) being configured to press against the print medium during movement; and

a friction mechanism disposed between the tensioning mechanism and the reel-out mechanism (100), the friction mechanism comprising:

a first friction member (310), the first friction member (310) being movable in response to movement of the pressing member (200); and

a second friction member (320) disposed on the reel-out mechanism (100) and rotating synchronously with the reel-out mechanism (100);

the first friction member (310) can be movably contacted with the second friction member (320), and the first friction member (310) can change the contact pressure with the second friction member (320) in the process of moving in response to the movement of the pressing member (200) so as to correspondingly change the speed of the rolling and releasing mechanism (100) for rolling and releasing the printing medium.

2. The print media tensioning device of claim 1, wherein the first friction member (310) comprises a friction assembly configured to be able to approach or move away from the second friction member (320) and press against the second friction member (320) during approach to the second friction member (320).

3. A printing medium tensioning device according to claim 1, characterized in that the first friction member (310) comprises a movable member, a friction plate (312) and a friction plate holder (313), the friction plate (312) being swingably connected to the movable member via the friction plate holder (313) so as to be able to swing relative to the second friction member (320) to increase or decrease a contact area with the second friction member (320).

4. A printing medium tensioning device according to claim 3, wherein the friction plate support (313) is provided with a limiting groove (3131), the movable member is correspondingly provided with a limiting post (3111), and the limiting post (3111) slides in the limiting groove (3131).

5. The print media tensioning device of claim 2, wherein the friction assembly further comprises a first resilient member (314), the first resilient member (314) configured to provide a first applied force to the friction assembly to cause the friction assembly to overcome the first applied force of the first resilient member (314) during the approach of the second friction member (320) such that the friction assembly moves relative to the second friction member (320) to vary the contact area with the second friction member (320).

6. A print media tensioning device according to claim 5, wherein the first friction member (310) comprises a first rocker member (311) swingably provided on the base frame, the first rocker member (311) being swingable relative to the second friction member (320) under the urging of the hold down member (200) to enable the friction pack to move towards or away from the second friction member (320).

7. The print media tensioning device of claim 5, wherein the first friction member (310) comprises a ram movably disposed on the base, the ram being movable relative to the base upon actuation of the hold-down member (200) to enable the friction assembly to move toward or away from the second friction member (320).

8. The printing medium tensioning device according to any one of claims 3 to 4, characterized by comprising a control device and a driving member, wherein the driving member can drive the movable part to move, the control device is electrically connected with the driving member, and the control device is used for acquiring the state or position of the pressing part (200) so that the driving member controls the movable part to approach or move away from the second friction part (320);

wherein the control device comprises a sensing assembly for acquiring the state or position of the pressing part (200).

9. The print media tensioning device of claim 6, wherein the hold-down member (200) comprises:

a pressing roller (210) for pressing the printing medium;

the second swinging part (220) is movably supported on the base frame, the pressing roller (210) is arranged on the second swinging part (220), and the movement of the second swinging part (220) can drive the first swinging part (311) to move relative to the second friction part (320).

10. The printing medium tensioning device according to claim 6, wherein the first friction member (310) further comprises a second elastic member (315), and the second elastic member (315) is used for driving the first swing member (311) to return.

11. The print media tensioning device of claim 9, wherein the tensioning mechanism further comprises a third resilient member (240), the third resilient member (240) being configured to provide a second applied force to the second rocker (220) to press the pressure roller (210) against the print media.

12. A printing device, comprising a printing module (410) and a printing medium tensioning device according to any one of claims 1 to 11, the printing module (410) being supported on the base frame, the paper feed path being formed between the reel-up mechanism (100) and the printing module (410).

13. A printing apparatus according to claim 12, further comprising a detecting element (420) arranged in said paper path, said detecting element (420) being configured to transmit a detecting signal to said printing medium and to receive a position signal fed back from said printing medium.

Images