Cloth winding and unwinding device and UV digital ink-jet printing equipment

Abstract

The embodiment of the utility model provides a cloth take-up and pay-off device and UV digital ink-jet printing equipment. The cloth winding and unwinding device is used for winding and unwinding a first coiled material and a second coiled material at the same time, and / or is used for winding and unwinding a single-roll wide coiled material, and comprises a first winding and unwinding component, a second winding and unwinding component and a connecting piece, the first winding and unwinding component is sleeved with the first coiled material, the second winding and unwinding component is sleeved with the second coiled material, and the first winding and unwinding component and the second winding and unwinding component are sleeved with the wide coiled material; at least part of the first retracting and releasing component and at least part of the second retracting and releasing component are assembled on the connecting piece; the first folding and unfolding part and the second folding and unfolding part are symmetrical about the connecting piece and have the same structure; the first folding and unfolding component and the second folding and unfolding component rotate independently and / or can rotate synchronously. The cloth winding and unwinding device can wind and unwind the first coiled material and the second coiled material at the same time and can also wind and unwind the wide-width coiled material, so that the UV digital ink-jet printing equipment can print the single-roll wide-width coiled material on the premise of printing double rolls of materials at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of printing equipment, and in particular to a cloth-retracting and unretracting device capable of realizing the simultaneous retraction and printing of double-rolled materials and a UV digital inkjet printing device. Background Art

[0002] UV digital inkjet printing equipment (UV stands for ultraviolet) can be used to print flexible materials (e.g., rolls). The cloth retracting and unreeling device of existing UV digital inkjet printing equipment is a complete pneumatic shaft, so that the existing cloth retracting and unreeling device can only reel in a single roll of material, resulting in the existing UV digital inkjet printing equipment only being able to print a single roll of material.

[0003] Traditional UV digital inkjet printing equipment cannot print two rolls of material simultaneously, resulting in low printing efficiency. Utility Model Content

[0004] The cloth-retracting and -unrestricting device and UV digital inkjet printing equipment provided by the utility model are intended to solve at least one defect of the existing cloth-retracting and -unrestricting device and UV digital inkjet printing equipment.

[0005] In a first aspect, the present invention provides a cloth-receiving and unreceiving device. The cloth-receiving and unreceiving device is used to simultaneously retract a first coil and a second coil, and / or to retract a single wide-width coil; the cloth-receiving and unreceiving device comprises:

[0006] a first retractable component; the first coil is sleeved on at least a portion of the first retractable component;

[0007] a second retractable component; the second coil is sleeved on at least a portion of the second retractable component;

[0008] A single roll of the wide-width coiled material can be sleeved on a portion of the first retractable component and a portion of the second retractable component;

[0009] Connecting member; at least a portion of the first retractable member and at least a portion of the second retractable member are assembled on the connecting member;

[0010] The first retractable component and the second retractable component are symmetrical about the connecting member and have the same structure;

[0011] The first retractable component and the second retractable component can rotate independently of each other, and / or the first retractable component and the second retractable component can rotate synchronously.

[0012] In some embodiments, the cloth-retracting and -unretracting device further comprises:

[0013] a first drive member and a second drive member;

[0014] The first driving component is connected to an end of the first retractable component away from the connecting component, and the second driving component is connected to an end of the second retractable component away from the connecting component, so as to drive the first retractable component and the second retractable component to rotate independently of each other, and / or drive the first retractable component and the second retractable component to rotate synchronously.

[0015] In some embodiments, the cloth-retracting and -unretracting device further comprises:

[0016] a first supporting member, a second supporting member, and a third supporting member;

[0017] The first driving component is fixedly mounted on the first supporting component;

[0018] The second driving component is fixedly mounted on the second supporting component;

[0019] The third supporting component is used to support the connecting piece to limit the connecting piece from rotating around the axis.

[0020] In some embodiments, the first supporting member and the second supporting member are symmetrical with respect to the third supporting member, and the first driving member and the second driving member are away from each other in an axial direction.

[0021] In some embodiments, the first retractable component is coaxially arranged with the connecting member; the first retractable component includes:

[0022] a first inflatable shaft, a first steel ring, a first bearing, and a second bearing;

[0023] One end of the first inflatable shaft in the axial direction is connected to the first driving component, and the first steel ring is fixedly mounted on the other end of the first inflatable shaft in the axial direction;

[0024] The first steel ring includes a first outer steel ring in an annular shape and a first inner steel ring in an annular shape, and the first inner steel ring is located on the inner ring side of the first outer steel ring;

[0025] The outer rings of the first bearing and the second bearing are both assembled on the inner ring surface of the first inner steel ring, and the inner rings of the first bearing and the second bearing are both sleeved on at least a portion of the connecting member.

[0026] In some embodiments, the second retractable component is coaxially arranged with the coupling member; the second retractable component comprises:

[0027] a second inflatable shaft, a second steel ring, a third bearing, and a fourth bearing;

[0028] One end of the second inflatable shaft in the axial direction is connected to the second driving component, and the second steel ring is fixedly mounted on the other end of the second inflatable shaft in the axial direction;

[0029] The second steel ring includes a second outer steel ring in an annular shape and a second inner steel ring in an annular shape, and the second inner steel ring is located on the inner ring side of the second outer steel ring;

[0030] The outer rings of the third bearing and the fourth bearing are both assembled on the inner ring surface of the second inner steel ring, and the inner rings of the third bearing and the fourth bearing are both sleeved on at least a portion of the connecting member;

[0031] The outer annular surface of the first outer steel ring, the outer annular surface of the second outer steel ring, the axial surface of the first inflatable shaft, the axial surface of the second inflatable shaft and the outer surface of the connecting member are flush with each other.

[0032] In some embodiments, the first coil is sleeved on the axial surface of the first inflatable shaft, and the second coil is sleeved on the axial surface of the second inflatable shaft;

[0033] The first inflatable shaft, the first steel ring, the first bearing and the second bearing all rotate synchronously in a preset first condition;

[0034] The second inflatable shaft, the second steel ring, the third bearing and the fourth bearing all rotate synchronously in a preset second situation;

[0035] The single roll of the wide-width coil is sleeved on the outer annular surface of the first outer steel ring, the outer annular surface of the second outer steel ring, the axial surface of the first inflatable shaft, the axial surface of the second inflatable shaft, and the outer surface of the connecting member.

[0036] The first situation and the second situation are independent of each other and do not affect each other; and / or the first situation and the second situation are the same, so that the first inflatable shaft and the second inflatable shaft form synchronous rotation.

[0037] In some embodiments, the third support member comprises:

[0038] A bracket, a mounting portion and a clamping portion; the mounting portion is provided on the bracket, and the clamping portion is assembled on the mounting portion;

[0039] Wherein, the clamping portion has a clamping groove, and the connecting member is received in the clamping groove so that the connecting member is clamped.

[0040] In some embodiments, the mounting portion is composed of a pair of vertical plates, and the clamping portion is composed of a pair of rollers;

[0041] A pair of vertical plates are arranged on the bracket along a first direction; a pair of rollers are assembled on the pair of vertical plates along a second direction, and the axes of the rollers are parallel to the first direction;

[0042] Wherein, the clamping groove is formed at positions where a pair of rollers are close to each other in the second direction; the first direction is the axial direction of the connecting member, and the second direction is orthogonal to the first direction.

[0043] In a second aspect, the present invention provides a UV digital inkjet printing device. The UV digital inkjet printing device comprises: a device body and the above-mentioned cloth-retracting and -unloading device;

[0044] The cloth-retracting and unretracting device is fixedly mounted on the device body, so that a first coil mounted on a first air shaft of the cloth-retracting and unretracting device and a second coil mounted on a second air shaft of the cloth-retracting and unretracting device are printed simultaneously;

[0045] When the first inflatable shaft and the second inflatable shaft rotate synchronously, the single roll of wide-format web sleeved on the first inflatable shaft and the second inflatable shaft is printed.

[0046] At least one beneficial effect of the cloth retracting and unwinding device and UV digital inkjet printing device provided by the embodiments of the present invention is: a novel cloth retracting and unwinding device suitable for UV digital inkjet printing devices is proposed, which adopts a structural design of adding a first retracting and unwinding component, a second retracting and unwinding component, and the first retracting and unwinding component and the second retracting and unwinding component to have independent rotation. Then, the first roll of material is placed on the first retracting and unwinding component, the second roll of material is placed on the second retracting and unwinding component, and the connecting component is used as the support structure of the first retracting and unwinding component, so that the cloth retracting and unwinding device can simultaneously retract and unwind the first roll of material and the second roll of material, further enabling the UV digital inkjet printing device to print two rolls of material at the same time, thereby effectively improving printing efficiency. In addition, when the first retracting and unwinding component form a synchronous rotation, the cloth retracting and unwinding device can also retract and unwind a single roll of wide-format coiled material, so that the UV digital inkjet printing device can print a single roll of wide-format coiled material while simultaneously printing two rolls of material. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as the same elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0048] Figure 1 A schematic structural diagram of a cloth-retracting and -unretracting device provided in an embodiment of the present utility model;

[0049] Figure 2 A cross-sectional diagram of the cooperation between the first retractable component, the second retractable component and the connecting member provided in an embodiment of the present utility model;

[0050] Figure 3 A schematic top view of a cloth retracting and unfolding device provided in an embodiment of the present invention;

[0051] Figure 4 The embodiment of the present invention provides Figure 3 A schematic cross-sectional view at AA;

[0052] Figure 5 The embodiment of the present invention provides Figure 1 A partial enlarged view at point B.

[0053] : Illustrations: 100, cloth retracting and releasing device; 1001, axial direction; 1, first retracting and releasing component; 11, first inflatable shaft; 12, first steel ring; 13, first bearing; 14, second bearing; 121, first outer steel ring; 122, first inner steel ring; 2, second retracting and releasing component; 21, second inflatable shaft; 22, second steel ring; 23, third bearing; 24, fourth bearing; 221, second outer steel ring; 222, second inner steel ring; 3, connecting part; 31, connecting shaft; 32, third steel ring; 4, first driving component; 5, second driving component; 6, first supporting component; 7, second supporting component; 8, third supporting component; 81, bracket; 82, mounting part; 83, clamping part; 821, vertical plate; 831, roller. DETAILED DESCRIPTION

[0054] The present invention is described in detail below with reference to specific embodiments. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope and application of the present invention.

[0055] It should be noted that, unless otherwise clearly specified and limited, the terms "axial direction", "first direction", "second direction", "away from", "mutually diverging" and the like used in this specification to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and 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. Therefore, they cannot be understood as limitations on the present invention. Terms such as "installation", "fitting", "connection" and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; "fixation" can be bolt fixation, snap fixation or glue fixation; the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated; thus, the features limited to "first", "second", "third" and "fourth" may explicitly or implicitly include one or more of the features; "multiple" or "several" means two or more; in addition, "and / or" includes any and all combinations of one or more related listed items; for ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0056] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] In this embodiment, the specific shape, structure and size of the "cloth collecting and releasing device and UV digital inkjet printing equipment" are not limited, and those skilled in the art can selectively use any appropriate implementation method according to actual needs.

[0058] Figure 1 This is a structural schematic diagram of a cloth retracting and unfolding device provided in an embodiment of the present utility model. Figure 2 A cross-sectional schematic diagram of the cooperation between the first retractable component, the second retractable component and the connecting member provided in an embodiment of the present utility model. Figure 3 This is a schematic top view of a cloth retracting and unfolding device provided in an embodiment of the present invention. Figure 4 The embodiment of the present invention provides Figure 3 Schematic cross-sectional view at AA.

[0059] See also Figures 1-4 The cloth-retracting and unretracting device 100 is used to simultaneously retract and unretract a first coil (not shown in the figure) and a second coil (not shown in the figure), and / or to retract and unretract a single roll of wide-width coil (not shown in the figure).

[0060] The cloth retracting and releasing device 100 comprises a first retracting and releasing component 1 , a second retracting and releasing component 2 and a connecting member 3 .

[0061] Among them, the first coil is mounted on at least a part of the first retractable component 1; the second coil is mounted on at least a part of the second retractable component 2; a single roll of wide-width coil can be mounted on a part of the first retractable component 1 and a part of the second retractable component 2.

[0062] In addition, at least a portion of the first retractable component 1 and at least a portion of the second retractable component 2 are assembled on the connecting member 3 .

[0063] In addition, the first retractable component 1 and the second retractable component 2 are symmetrical about the connecting member 3 and have the same structure.

[0064] In an embodiment of the present application, the first retractable component 1 and the second retractable component 2 can rotate independently of each other, and / or the first retractable component 1 and the second retractable component 2 can rotate synchronously; the connecting member 3 is composed of a connecting shaft 31 and a ring-shaped third steel ring 32, and the ring-shaped third steel ring 32 is sleeved on the axial surface of the connecting shaft 31.

[0065] Specifically, the rotation of the first retractable component 1 and the second retractable component 2 does not affect each other, so that the two can rotate independently under the support of the connecting member 3. Therefore, the first retractable component 1 and the second retractable component 2 can achieve different rotation speeds, so that the cloth retracting device 100 can realize the simultaneous printing of two rolls of material (two rolls of material refer to the first roll of material and the second roll of material), effectively improving the printing efficiency.

[0066] Further explanation, when the first retracting component 1 and the second retracting component 2 rotate synchronously, the above-mentioned single roll of wide-width coiled material is printed; this enables the cloth retracting device 100 to not only realize the function of simultaneously retracting and releasing the first coiled material and the second coiled material, but also to take into account the retracting and releasing function of a single roll of wide-width coiled material (which can also be understood as a long-span coiled material).

[0067] In some embodiments, as Figures 1-4 As shown, the cloth-retracting and -unretracting device 100 further includes: a first driving component 4 and a second driving component 5 .

[0068] It should be noted that the first driving component 4 is connected to the end of the first retractable component 1 away from the connecting component 3, and the second driving component 5 is connected to the end of the second retractable component 2 away from the connecting component 3, so as to drive the first retractable component 1 and the second retractable component 2 to rotate independently of each other, and / or drive the first retractable component 1 and the second retractable component 2 to rotate synchronously.

[0069] In some embodiments, combined Figure 1 and Figure 4 It can be seen that the cloth-retracting and -unloading device 100 further includes: a first supporting component 6 , a second supporting component 7 and a third supporting component 8 .

[0070] It can be understood that the first driving component 4 is fixedly mounted on the first supporting component 6; the second driving component 5 is fixedly mounted on the second supporting component 7; and the third supporting component 8 is used to support the connecting component 3 to limit the rotation of the connecting component 3 around the axial direction 1001.

[0071] In some embodiments, according to Figure 1 and Figure 4 It can be seen that the first supporting member 6 and the second supporting member 7 are symmetrical with respect to the third supporting member 8 , and the first driving member 4 and the second driving member 5 are away from each other in the axial direction 1001 .

[0072] Figure 5 The embodiment of the present invention provides Figure 1 A partial enlarged view at point B.

[0073] In some embodiments, Figure 1 、 Figure 2 、 Figure 4 and Figure 5 It can be seen that the first retractable component 1 is coaxially arranged with the connecting component 3 ; the first retractable component 1 includes: a first inflatable shaft 11 , a first steel ring 12 , a first bearing 13 and a second bearing 14 .

[0074] One end of the first inflatable shaft 11 in the axial direction 1001 is connected to the first driving component 4 , and the first steel ring 12 is fixedly installed on the other end of the first inflatable shaft 11 in the axial direction 1001 .

[0075] The first steel ring 12 includes a first outer steel ring 121 in an annular shape and a first inner steel ring 122 in an annular shape, and the first inner steel ring 122 is located on the inner ring side of the first outer steel ring 121 .

[0076] In addition, the outer rings of the first bearing 13 and the second bearing 14 are both assembled on the inner ring surface of the first inner steel ring 122 , and the inner rings of the first bearing 13 and the second bearing 14 are both sleeved on at least a portion of the connecting member 3 .

[0077] In some embodiments, reference Figure 1 、 Figure 2 、 Figure 4 and Figure 5 It can be seen that the second retractable component 2 is coaxially arranged with the connecting component 3 ; the second retractable component 2 includes: a second inflatable shaft 21 , a second steel ring 22 , a third bearing 23 and a fourth bearing 24 .

[0078] It can be understood that one end of the second inflatable shaft 21 in the axial direction 1001 is connected to the second driving component 5, and the second steel ring 22 is fixedly installed on the other end of the second inflatable shaft 21 in the axial direction 1001.

[0079] The second steel ring 22 includes a second outer steel ring 221 in an annular shape and a second inner steel ring 222 in an annular shape, and the second inner steel ring 222 is located on the inner ring side of the second outer steel ring 221 .

[0080] It should be noted that the outer rings of the third bearing 23 and the fourth bearing 24 are both assembled on the inner ring surface of the second inner steel ring 222 , and the inner rings of the third bearing 23 and the fourth bearing 24 are both sleeved on at least a portion of the connecting member 3 .

[0081] Among them, the outer ring surface of the first outer steel ring 121, the outer ring surface of the second outer steel ring 221, the axial surface of the first inflatable shaft 11, the axial surface of the second inflatable shaft 21 and the outer surface of the connecting part 3 (that is, the outer ring surface of the third steel ring 32) are flush with each other, so as to facilitate the retraction and unfolding of the above-mentioned wide-width coiled material.

[0082] Specifically, the first inflatable shaft 11 and the second inflatable shaft 21 can both be made of aluminum; and, the cloth retracting and unwinding device 100 uses two independently rotatable inflatable shafts to replace a complete inflatable shaft in a traditional cloth retracting and unwinding device to achieve different rotational speeds, thereby enabling the cloth retracting and unwinding device 100 to simultaneously retract and unwind two rolls of material, and further enabling a UV digital inkjet printing device (not shown in the figure) equipped with the cloth retracting and unwinding device to simultaneously print two rolls of material.

[0083] In the embodiment of the present application, the first steel ring 12 , the second steel ring 22 and the third steel ring 32 may all be chrome-plated steel rings.

[0084] In some embodiments, please refer to Figure 1-Figure 5 The first coil is sleeved on the axial surface of the first inflatable shaft 11, and the second coil is sleeved on the axial surface of the second inflatable shaft 21.

[0085] Specifically, the inflatable shaft is also called pneumatic shaft, expansion shaft, inflated shaft, inflatable roller, etc. It is a special winding and unwinding shaft; generally speaking, the inflatable shaft is a shaft whose surface can protrude after high-pressure inflation, and the surface part of the shaft quickly retracts after deflation.

[0086] To further explain, the inflatable shaft has the advantage of short inflation operation time, which usually takes only a few seconds to complete inflation and deflation; the coiled material is easy to place on the inflatable shaft and can be fixed at any position on the shaft surface; in addition, the inflatable shaft is suitable for coiled materials of various thicknesses, widths and narrownesses.

[0087] In summary, inflatable shafts are widely used in the rewinding and unwinding systems of printing equipment (for example, plate printing machines, flexographic printing machines, gravure printing machines, trademark printing machines, etc.), coating machines, leather machines, shaping machines, embossing machines, slitting machines, die-cutting machines, rewinding machines, paper tube machines, bag making machines, laminating machines, film blowing machines, foaming machines, laminating machines, embossing machines, papermaking machines, non-woven fabric machines, cloth inspection machines, hot stamping machines, battery equipment and other machinery.

[0088] In summary, the pneumatic shaft is an efficient and convenient winding and unwinding tool. Its working principle relies on the charging and releasing of air pressure to achieve the locking and loosening of the coil.

[0089] In the embodiment of the present application, the first inflatable shaft 11, the first steel ring 12, the first bearing 13 and the second bearing 14 all rotate synchronously in a preset first situation.

[0090] To further illustrate, the second inflatable shaft 21 , the second steel ring 22 , the third bearing 23 and the fourth bearing 24 all rotate synchronously in the preset second situation.

[0091] The single-roll wide-width coil is sleeved on the outer annular surface of the first outer steel ring 121, the outer annular surface of the second outer steel ring 221, the axial surface of the first inflatable shaft 11, the axial surface of the second inflatable shaft 21 and the outer surface of the connecting part 3 (that is, the outer annular surface of the third steel ring 32).

[0092] It should be noted that the first situation and the second situation are independent of each other and do not affect each other; and / or the first situation and the second situation are the same, so that the first inflatable shaft 11 and the second inflatable shaft 21 form a synchronous rotation.

[0093] In some embodiments, see Figure 5 The third supporting component 8 includes: a bracket 81, a mounting portion 82 and a clamping portion 83.

[0094] The mounting portion 82 is provided on the bracket 81 , and the clamping portion 83 is assembled on the mounting portion 82 .

[0095] In addition, the clamping portion 83 has a clamping groove, and the connecting member 3 is received in the clamping groove so that the connecting member 3 is clamped.

[0096] In some embodiments, as Figure 5 As shown, the mounting portion 82 is composed of a pair of vertical plates 821 , and the clamping portion 83 is composed of a pair of rollers 831 .

[0097] It can be understood that the pair of vertical plates 821 are arranged on the bracket 81 along the first direction; the pair of rollers 831 are assembled on the pair of vertical plates 821 along the second direction, and the axes of the rollers 831 are parallel to the first direction.

[0098] Specifically, a pair of rollers 831 form clamping grooves at positions close to each other in the second direction; the first direction is the axial direction 1001 of the connecting member 3, and the second direction is orthogonal to the first direction.

[0099] Combine Figure 1-Figure 5 It can be seen that the UV digital inkjet printing device includes: a device body and the above-mentioned cloth-retracting and -unloading device 100 .

[0100] It should be noted that the cloth retracting and unwinding device 100 is fixedly mounted on the device body so that the first coil mounted on the first inflatable shaft 11 of the cloth retracting and unwinding device 100 and the second coil mounted on the second inflatable shaft 21 of the cloth retracting and unwinding device 100 are printed simultaneously.

[0101] When the first inflatable shaft 11 and the second inflatable shaft 21 rotate synchronously, the single roll of wide-format web sleeved on the first inflatable shaft 11 and the second inflatable shaft 21 is printed.

[0102] In summary, the cloth-retracting and unretracting device and UV digital inkjet printing device provided by the embodiment of the present invention adopt a structural design that includes a first retracting and unretracting component, a second retracting and unretracting component, and a connecting component, and the first retracting and unretracting component and the second retracting and unretracting component have independent rotation. Then, the first coil is placed on the first retracting and unretracting component, the second coil is placed on the second retracting and unretracting component, and the connecting component is used as the support structure of the first retracting and unretracting component. This allows the cloth-retracting and unretracting device to simultaneously retract and unretract the first coil and the second coil, further allowing the UV digital inkjet printing device to simultaneously print two rolls of material, thereby effectively improving printing efficiency. In addition, when the first retracting and unretracting component rotates synchronously, the cloth-retracting and unretracting device can also retract and unretract a single roll of wide-format coiled material, so that the UV digital inkjet printing device can print a single roll of wide-format coiled material while simultaneously printing two rolls of material. Therefore, the cloth-retracting and unretracting device and UV digital inkjet printing device provided by the embodiment of the present invention have certain novelties compared to traditional cloth-retracting and unretracting devices and UV digital inkjet printing devices.

[0103] The above content is a further detailed description of the present invention in conjunction with specific / preferred embodiments, and the specific implementation of the present invention cannot be limited to these descriptions. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the concept of the present invention, and all of these modifications and improvements fall within the scope of protection of the present invention.

Claims

1. A cloth-reeling and unreeling device for simultaneously reeling in a first coil and a second coil, and / or for reeling in a single wide-width coil; characterized in that: include: a first retractable component; the first coil is sleeved on at least a portion of the first retractable component; a second retractable component; the second coil is sleeved on at least a portion of the second retractable component; A single roll of the wide-width coiled material can be sleeved on a portion of the first retractable component and a portion of the second retractable component; Connecting member; at least a portion of the first retractable member and at least a portion of the second retractable member are assembled on the connecting member; The first retractable component and the second retractable component are symmetrical about the connecting member and have the same structure; The first retractable component and the second retractable component can rotate independently of each other, and / or the first retractable component and the second retractable component can rotate synchronously.

2. The cloth-retracting and -unloading device according to claim 1, characterized in that: Also includes: a first drive member and a second drive member; The first driving component is connected to an end of the first retractable component away from the connecting component, and the second driving component is connected to an end of the second retractable component away from the connecting component, so as to drive the first retractable component and the second retractable component to rotate independently of each other, and / or drive the first retractable component and the second retractable component to rotate synchronously.

3. The cloth-retracting and -unloading device according to claim 2, characterized in that: Also includes: a first supporting member, a second supporting member, and a third supporting member; The first driving component is fixedly mounted on the first supporting component; The second driving component is fixedly mounted on the second supporting component; The third supporting component is used to support the connecting piece to limit the connecting piece from rotating around the axis.

4. The cloth-retracting and -unloading device according to claim 3, characterized in that: The first supporting member and the second supporting member are symmetrical with respect to the third supporting member, and the first driving member and the second driving member are separated from each other in the axial direction.

5. The cloth-retracting and -unloading device according to claim 2, characterized in that: The first retractable component is coaxially arranged with the connecting member; and is characterized in that the first retractable component comprises: a first inflatable shaft, a first steel ring, a first bearing, and a second bearing; One end of the first inflatable shaft in the axial direction is connected to the first driving component, and the first steel ring is fixedly mounted on the other end of the first inflatable shaft in the axial direction; The first steel ring includes a first outer steel ring in an annular shape and a first inner steel ring in an annular shape, and the first inner steel ring is located on the inner ring side of the first outer steel ring; The outer rings of the first bearing and the second bearing are both assembled on the inner ring surface of the first inner steel ring, and the inner rings of the first bearing and the second bearing are both sleeved on at least a portion of the connecting member.

6. The cloth-retracting and -unloading device according to claim 5, characterized in that: The second retractable component is coaxially arranged with the connecting member; and is characterized in that the second retractable component comprises: a second inflatable shaft, a second steel ring, a third bearing, and a fourth bearing; One end of the second inflatable shaft in the axial direction is connected to the second driving component, and the second steel ring is fixedly mounted on the other end of the second inflatable shaft in the axial direction; The second steel ring includes a second outer steel ring in an annular shape and a second inner steel ring in an annular shape, and the second inner steel ring is located on the inner ring side of the second outer steel ring; The outer rings of the third bearing and the fourth bearing are both assembled on the inner ring surface of the second inner steel ring, and the inner rings of the third bearing and the fourth bearing are both sleeved on at least a portion of the connecting member; The outer annular surface of the first outer steel ring, the outer annular surface of the second outer steel ring, the axial surface of the first inflatable shaft, the axial surface of the second inflatable shaft and the outer surface of the connecting member are flush with each other.

7. The cloth-retracting and -releasing device according to claim 6, characterized in that: The first coil is sleeved on the axial surface of the first inflatable shaft, and the second coil is sleeved on the axial surface of the second inflatable shaft; The first inflatable shaft, the first steel ring, the first bearing and the second bearing all rotate synchronously in a preset first condition; The second inflatable shaft, the second steel ring, the third bearing and the fourth bearing all rotate synchronously in a preset second situation; The single roll of the wide-width coil is sleeved on the outer annular surface of the first outer steel ring, the outer annular surface of the second outer steel ring, the axial surface of the first inflatable shaft, the axial surface of the second inflatable shaft, and the outer surface of the connecting member. The first situation and the second situation are independent of each other and do not affect each other; and / or the first situation and the second situation are the same, so that the first inflatable shaft and the second inflatable shaft form synchronous rotation.

8. The cloth-retracting and -unloading device according to claim 3, characterized in that: The third supporting member comprises: A bracket, a mounting portion and a clamping portion; the mounting portion is provided on the bracket, and the clamping portion is assembled on the mounting portion; Wherein, the clamping portion has a clamping groove, and the connecting member is received in the clamping groove so that the connecting member is clamped.

9. The cloth-retracting and -unloading device according to claim 8, characterized in that: The mounting portion is composed of a pair of vertical plates, and the clamping portion is composed of a pair of rollers; A pair of vertical plates are arranged on the bracket along a first direction; a pair of rollers are assembled on the pair of vertical plates along a second direction, and the axes of the rollers are parallel to the first direction; Wherein, the clamping groove is formed at positions where a pair of rollers are close to each other in the second direction; the first direction is the axial direction of the connecting member, and the second direction is orthogonal to the first direction.

10. A UV digital inkjet printing device, characterized in that: include: The device body and the cloth-retracting and -releasing device according to any one of claims 1 to 9; The cloth-retracting and unretracting device is fixedly mounted on the device body, so that a first coil mounted on a first air shaft of the cloth-retracting and unretracting device and a second coil mounted on a second air shaft of the cloth-retracting and unretracting device are printed simultaneously; When the first inflatable shaft and the second inflatable shaft rotate synchronously, the single roll of wide-format web sleeved on the first inflatable shaft and the second inflatable shaft is printed.

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