Ink bag

Abstract

The utility model relates to a large format printer, in particular to an ink bag. The sealing end of an existing ink bag sealing piece can lose efficacy after being corroded by ink, and work of an ink bag is affected. The ink bag comprises an ink bag body, the two faces of the ink bag body are both provided with open cavities, the open cavities are covered with films respectively to form a first cavity and a second cavity, a transverse hole channel is formed in the ink bag body and communicated with the two film cavities, a sealing piece, a base, a first spring and a first disc which are sequentially adjacent are arranged in the first cavity, and the sealing piece and the base form a valve. The first spring abuts against the valve, a second spring and a second disc which abut against each other are arranged in the second cavity, the two ends of the second spring abut against the second disc and the end face of one side of the transverse hole channel respectively, a push rod is fixed to the second disc and penetrates into the transverse hole channel, and the first spring abuts against the valve to enable the side wall of the sealing piece to press the inner wall of the side, connected with the transverse hole channel, of the first cavity to conduct sealing extending in the axial direction. The side face of the sealing piece is tightly attached to the inner wall of the first cavity for axial sealing, the sealing area and length are increased, and effective sealing can still be achieved after ink corrosion.

Description

Technical Field

[0001] The utility model relates to the technical field of large-format printers, in particular to an ink sac. Background Art

[0002] An ink sac is an ink liquid caching device directly connected to a print head. An ink inlet joint and an ink outlet joint are respectively arranged at the top end and the bottom end of the ink sac. An elastic sealing ring for connecting to the print head is arranged inside the ink outlet joint. A flow channel, a filtering element and a valve that can be movably opened and closed are arranged inside the ink sac. The flow channel is jointly composed of an open cavity on the ink sac body, an internal flow channel, a coating film covering the open cavity on both the front and back sides, etc. The valve can be movably opened and closed through a transverse hole in the ink sac body. Both ends of the transverse hole are respectively communicated with a first cavity and a second cavity formed by covering the open cavity with a film. The first cavity is communicated with the ink inlet joint through an ink inlet flow channel. A first disc, a first spring, a base and a seal are sequentially arranged from outside to inside in the film cavity. The base and the seal form the valve. The second cavity is communicated with the ink outlet joint through an ink outlet flow channel. A second disc that can push the valve to open and a second spring that elastically pushes it are arranged in the film cavity. A push rod is arranged at the center of the second disc and penetrates into the transverse hole. The axes of the two discs, the two springs, the valve and the transverse hole coincide. The two discs respectively abut between the corresponding film and spring. The valve of this kind of ink sac is composed of a split base and a seal. The seal uses a protrusion around the peripheral edge of the end face as a sealing end. The sealing end abuts against one end face of the transverse hole to form a sealing ring for radial planar sealing. During use, after being corroded by ink, the protrusion will become flat and thin and cannot form a sealing ring, and then the sealing effect of the valve becomes poor, affecting the normal operation of the ink sac. Further, when the first disc on the same side of the valve is installed, it rotates, making the assembly of the ink sac convenient, but affecting the assembly speed and production efficiency.

[0003] During operation, after the print head sprays ink, a negative pressure will be generated on the ink sac. The coating film in the second cavity is pushed inward by the atmospheric pressure to move the second disc inward. The push rod moves inward with the second disc to push the valve to move outward and open. The first spring and the second spring are gradually compressed. The ink liquid can be replenished from the first cavity through the transverse hole into the second cavity. After the internal pressure in the second cavity rises, it can push the second disc to return to its original position, and the two springs also elongate and return to their original positions. The valve closes again. After the second disc returns to its original position, it abuts against the coating film in the corresponding cavity and makes it bulge and tighten. The second cavity maintains a certain negative pressure to prevent the print head from dripping ink in the non-working state. Content of the Utility Model

[0004] The technical problem to be solved and the technical task proposed by the present utility model are directed to the technical problem that after the sealing end of the raised sealing member on the existing ink sac is corroded by ink, an effective sealing ring cannot be formed, resulting in a poor sealing effect of the valve and affecting the operation of the ink sac. The present utility model provides an ink sac. The sealing member on the ink sac provides axial sealing by closely adhering to the inner wall of the first chamber on the side, effectively increasing the sealing area and length. Even if a sealing member is corroded by ink, effective sealing can still be achieved by the spring pushing, enabling the valve and the ink sac to operate normally. Further, when the first disc is installed, it is limited by a special positioning structure and will not rotate to affect the assembly of the ink sac, which can accelerate the assembly speed of the ink sac and improve production efficiency.

[0005] The technical solution adopted by the present utility model to solve the technical problem: An ink sac, including an ink sac body having an ink inlet joint and an ink outlet joint. An elastic sealing ring for connecting the print head is provided inside the ink outlet joint. Both sides of the ink sac body are provided with open cavities and are respectively covered with films to form a first chamber and a second chamber. A transverse channel is provided inside the ink sac body to communicate the two film chambers. A sealing member, a base, a first spring, and a first disc are sequentially arranged adjacent to each other in the first chamber. The sealing member and the base form a valve. The first spring abuts against the valve. A second spring and a second disc that abut against each other are provided in the second chamber. Two ends of the second spring respectively abut against the second disc and the end face on one side of the transverse channel. A push rod fixed on the second disc penetrates into the transverse channel. The feature is that the first spring abuts against the valve to press the side wall of the sealing member against the inner wall of the first chamber on the side connecting to the transverse channel, forming a seal extending along the axis. The present utility model forms an axially extending sealing structure by the side wall of the sealing member closely adhering to the inner wall of the first chamber, replacing the original sealing structure in which the sealing member relies on the raised end face as a sealing ring to form a seal in the radial plane, increasing the sealing area of the sealing member. The first spring abuts against the valve to ensure that the sealing member moves forward, and the side wall presses against the inner wall of the first chamber. During use, after the sealing member is corroded by ink, the first spring abuts against the valve to make it move forward, so that the side wall of the sealing member remains closely adhered to the inner wall of the first chamber for sealing.

[0006] As a further improvement and supplement to the above technical solution, the present utility model adopts the following technical measures: The outer diameter dimension of the sealing member gradually increases from the front end of the sealing side towards the base direction, forming a tapered section with a smaller front and a larger rear. The side wall of the tapered section closely adheres to the inner wall of the first chamber to form a sealing structure. A tapered hole wall matching the shape of the tapered section is provided on the inner wall of the first chamber. The sealing on the sealing member is formed by the matching of the tapered section and the tapered hole wall of the inner wall of the first chamber. The sealing surface formed by their matching has extension components in both the axial and radial directions to increase the sealing area and improve the sealing effect.

[0007] Preferably, an angle of 45° is formed between the generatrix and the center line of the conical section. The 45° angle enables the sealing structure to have the same components in the radial and axial directions, providing the maximum sealing area. At this time, the sealing effect is optimal when the conical section is in close contact with the conical hole wall. If the angle is too large or too small, the sealing structure will tend to rely only on the radial plane formed by the end face of the seal, resulting in a reduced sealing area.

[0008] Preferably, a notch is formed by concaving the center of the front end face of the seal on the corresponding sealing side. The notch can thin the wall thickness of part of the seal around its circumference, thereby improving the elasticity of the front end of the seal where the notch is located, making the side wall of part of the seal at this position more elastic, and further enhancing the sealing effect of the seal when it is pressed against and fitted to the inner wall of the first cavity.

[0009] Preferably, a positioning structure is provided between the first disc and the inner wall of the first cavity, and the first disc is limited in the first cavity by the positioning structure. The function of the positioning structure is to limit and install the first disc in the first cavity. When the first disc is placed in the first cavity, it will not affect the ink sac assembly due to rotation or offset, which can accelerate the ink sac assembly speed and improve production efficiency.

[0010] Preferably, the positioning structure includes abutting and limiting between the edge of the first disc and the inner wall of the first cavity and / or sleeving and limiting between the first disc and the inner wall of the first cavity. The positioning structure can be in the form of abutting and limiting or sleeving and limiting. Among them, abutting and limiting is that the first disc prevents rotation and offset by abutting against the inner wall of the first cavity through its edge, and sleeving and limiting is that the first disc and the inner wall of the first cavity are sleeved to prevent rotation and offset.

[0011] Preferably, the abutting and limiting is that the straight edge provided on the edge of the first disc is in contact with the plane provided on the inner wall of the first cavity, and the sleeving and limiting is that the through hole provided on the first disc is sleeved and connected with the boss provided on the inner wall of the first cavity. The abutting and limiting is that the straight edge of the first disc abuts against the plane of the first cavity, so that the first disc is limited in the first cavity and will not rotate or offset in the plane; the sleeving and limiting is that the through hole of the first disc is sleeved on the boss on the inner wall of the first cavity, so that the first disc is limited in the first cavity and will not rotate or offset in the plane.

[0012] Preferably, one straight edge is provided at each of the two side edges of the first disc, and the two straight edges are parallel and opposite to each other. Two planes that match the positions and lengths of the two straight edges are provided on the inner wall of the first cavity. Two symmetrically arranged through holes are provided on the first disc, and two symmetrically arranged bosses and two through holes that match are provided on the inner wall of the first cavity. When the first disc is placed in the first cavity, the two straight edges limit the first disc by abutting against the corresponding planes. The two through holes on the first disc are respectively sleeved on the two bosses on the inner wall of the first cavity to limit the first disc.

[0013] Preferably, at least one circumferentially continuous annular rib is provided on the inner wall of the elastic sealing ring. The annular rib improves the tight-fitting effect of the ink sac connector and the print head by narrowing the clearance size of the inner edge of the elastic sealing ring, enabling the two to be closely docked while enhancing the sealing performance.

[0014] Preferably, the annular rib protrudes 0.3 mm radially from the inner wall of the elastic sealing ring. The protruding distance within this range can meet the requirements of fastening the docked print head and improving the sealing performance. If the protruding distance is too large, it will be difficult to insert the print head; if the protruding distance is too small, the fastening effect will be poor.

[0015] The beneficial technical effects of the present utility model are as follows: The side of the sealing member closely adheres to the inner wall of the first cavity to provide axial sealing, increasing the sealing area and length. Even when the sealing member is corroded by the ink, effective sealing can still be achieved by the spring pushing, ensuring the normal operation of the valve and the ink sac. Further, during installation, the first disc is limited by the positioning structure to prevent rotation from affecting the ink sac assembly, accelerating the ink sac assembly speed and improving production efficiency. The annular rib is radially convex on the inner wall of the elastic sealing ring, improving the fastening effect and sealing performance of the docked print head. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : Exploded view of the structure of the present utility model.

[0017] Figure 2 : Cross-sectional view of the gasket of the present utility model.

[0018] Figure 3 : Partial cross-sectional view of the present utility model.

[0019] Figure 4 : Cross-sectional view of the sealing sleeve of the present utility model.

[0020] In the figure: 1. Ink sac body, 2. Ink inlet connector, 3. Ink outlet connector, 4. First cavity, 41. Conical hole wall, 42. Plane, 43. Boss, 5. Second cavity, 6. Horizontal hole, 7. Sealing member, 71. Conical section, 72. Notch, 8. Base, 9. First disc, 91. Straight edge, 92. Through hole, 93. Arc edge, 10. Second spring, 11. Second disc, 12. Push rod, 13. Elastic sealing ring, 131. Annular rib, 14. First spring, 15. Coating film, 16. Fastening ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present utility model will be further described below in conjunction with the drawings and the specific embodiments.

[0022] As Figures 1 to 4As shown in the figure, the utility model relates to an ink sac, which comprises an ink sac body 1 with an ink inlet joint 2 and an ink outlet joint 3. An elastic sealing ring 13 for connecting a print head is arranged in the ink outlet joint 3. The elastic sealing ring 13 is fixed in the ink outlet joint 2 by a fastening ring 16 inserted and fastened at the bottom of the ink outlet joint 3. Both sides of the ink sac body 1 are provided with open cavities, and films 15 are respectively pasted to form a first cavity 4 and a second cavity 5. A transverse channel 6 is arranged in the ink sac body 1 to communicate the two cavities. In the first cavity 4, a seal 7, a base 8, a first spring 14 and a first disc 9 are arranged adjacent to each other in sequence from the inside out. The seal 7 and the base 8 are integrally injection-molded into a valve. The first spring 14 presses against the valve to seal the first cavity and block the communication between the first cavity and the transverse channel 6. In the second cavity 5, a second spring 10 and a second disc 11 are arranged in contact with each other. Both ends of the second spring 10 respectively press against the second disc 11 and the end face on one side of the transverse channel 6. A push rod 12 is fixed on the second disc 11 and penetrates into the transverse channel 6. The first spring 14 presses against the valve to press the side wall of the seal 7 against the inner wall of the first cavity 4 on the side connected to the transverse channel 6, forming a seal extending along the axis. The outer diameter of the seal 7 gradually increases from the front end of the sealed side backward toward the base 8, forming a tapered section 71 with a smaller front and a larger rear. The side wall of the tapered section 71 is closely attached to the inner wall of the first cavity 4 to form a sealing structure. A tapered hole wall 41 matching the shape of the tapered section 71 is arranged on the inner wall of the first cavity 4.

[0023] The seal forms an axially extending sealing structure by closely attaching the side wall to the inner wall of the first cavity, so as to increase the sealing area of the seal. The first spring presses against the valve to ensure that the seal tends forward, and the side wall presses against the inner wall of the first cavity to block the communication between the first cavity and the transverse channel. Compared with the existing sealing structure in which the seal relies on a raised ring around the end face as a sealing ring to form a sealing structure in the radial plane, the sealing area of the seal in this embodiment is larger. The sealing surface formed by the matching of the tapered section and the tapered hole wall of the first cavity extends in both the axial and radial directions, which helps to increase the sealing area and improve the sealing effect. During use, after the ink corrodes the seal, the first spring presses against the valve to make it move forward, and the seal continues to use the remaining side wall to closely adhere to the inner wall of the first cavity for sealing.

[0024] Furthermore, the included angle between the generatrix and the center line of the tapered section 71 is 45°. The 45° included angle makes the sealing structure have the same extension component in the radial and axial directions, providing the largest sealing area and making the sealing effect best after the tapered section and the tapered hole wall are closely attached. If the included angle is too large or too small, the sealing structure will tend to rely only on the end face part of the seal to form a radial plane seal, and the sealing area will decrease. After the ink corrodes, with the first spring pressing against the valve, the seal only relies on the end face to closely adhere for sealing.

[0025] Furthermore, the front end face center of the seal 7 corresponding to the sealed side is concave to form a notch 72. The wall thickness of the part of the seal around the notch is thinned, so that the front part of the seal is more elastic, which helps to improve the sealing effect of the seal pressing and fitting against the inner wall of the first cavity.

[0026] Furthermore, a positioning structure is also provided between the inner wall of the first tray 9 and the first cavity 4. The first tray 9 is limited in the first cavity 4 through the positioning structure, so that when the first tray is placed in the first cavity, the ink sac assembly will not be affected by rotation or deviation, thereby accelerating the ink sac assembly speed and improving production efficiency.

[0027] The positioning structure includes abutting and limiting between the edge of the first tray 9 and the inner wall of the first cavity 4 and / or nested limiting between the first tray 9 and the inner wall of the first cavity 4. The abutting and limiting is that the first tray abuts against the inner wall of the first cavity through the edge to prevent rotation and deviation, and the nested limiting is that the first tray and the inner wall of the first cavity are sleeved to prevent rotation and deviation. In this embodiment, a structure with both abutting and limiting and nested limiting is adopted.

[0028] As shown in the figure, the abutting and limiting is that the straight edge 91 provided at the edge of the first tray 9 is fitted with the plane 42 provided on the inner wall of the first cavity 4. The first tray 9 is waist-shaped, having arc edges 93 at both ends and two parallel and opposite straight edges 91. The inner wall of the first cavity 4 is provided with two planes 42 that match the positions and lengths of the two straight edges 91; the nested limiting shown is that the through holes 92 provided on the first tray 9 are sleeved and connected with the bosses 43 provided on the inner wall of the first cavity 4. There are two symmetrically arranged through holes 92 on the first tray 9, and two symmetrically arranged bosses 43 that match the two through holes 92 are provided on the inner wall of the first cavity 4.

[0029] When the first tray is placed in the first cavity, the two straight edges of the first tray abut against the corresponding planes on the inner wall of the first cavity; at the same time, the two through holes on the first tray are respectively sleeved on the two bosses on the inner wall of the first cavity, and the two methods of abutting and nesting act together to limit the first tray in the first cavity.

[0030] Furthermore, at least two circumferentially continuous and parallel annular ribs 131 are provided on the inner wall of the elastic sealing ring 13. The annular ribs 131 protrude 0.3 mm radially from the inner wall of the elastic sealing ring. By narrowing the clearance size of the inner edge of the elastic sealing ring, the tight-fitting effect of the ink sac connector and the print head is improved, making the ink sac connector and the print head more tightly inserted, and further improving the airtightness when the two are docked. The protruding distance of the annular ribs is controlled at 0.3 mm, making the insertion easy and effectively tightly fitting.

Claims

1. An ink sac, comprising an ink sac body (1) having an ink inlet connector (2) and an ink outlet connector (3). An elastic sealing ring (13) for connecting to a print head is provided inside the ink outlet connector (3). Open cavities are provided on both sides of the ink sac body (1), and are respectively covered with films to form a first cavity (4) and a second cavity (5). A transverse channel (6) is provided inside the ink sac body (1) to communicate the two cavities. A seal (7), a base (8), a first spring (14) and a first disc (9) are arranged adjacent to each other in sequence in the first cavity (4). The seal (7) and the base (8) form a valve, and the first spring (14) abuts against the valve. A second spring (10) and a second disc (11) that abut against each other are arranged in the second cavity (5). Two ends of the second spring (10) respectively abut against the second disc (11) and an end face on one side of the transverse channel (6). A push rod (12) fixed on the second disc (11) penetrates into the transverse channel (6). It is characterized in that The first spring (14) abuts against the valve to press the side wall of the seal (7) against the inner wall of the first chamber (4) on the side connected to the transverse channel (6), forming an axially extending seal.

2. The ink sac according to claim 1, wherein The outer diameter of the seal (7) gradually increases from the front end of the sealed side towards the base (8) in the backward direction, forming a tapered section (71) with a smaller front and a larger rear. The side wall of the tapered section (71) is in close contact with the inner wall of the first chamber (4) to form a sealing structure. A tapered hole wall (41) matching the shape of the tapered section (71) is provided on the inner wall of the first chamber (4).

3. The ink sac according to claim 2, wherein An angle of 45° is formed between the generatrix of the tapered section (71) and the center line.

4. The ink sac according to claim 2, characterized in that A notch (72) is formed by concaving the center of the front end face of the seal (7) corresponding to the sealed side.

5. The ink sac according to claim 1, characterized in that A positioning structure is provided between the first disc (9) and the inner wall of the first chamber (4), and the first disc (9) is limited in the first chamber (4) through the positioning structure.

6. The ink sac according to claim 5, characterized in that The positioning structure includes abutting and limiting between the edge of the first disc (9) and the inner wall of the first chamber (4) and / or nesting and limiting between the first disc (9) and the inner wall of the first chamber (4).

7. The ink sac according to claim 6, characterized in that The abutting and limiting is that a straight edge (91) provided on the edge of the first disc (9) fits with a plane (42) provided on the inner wall of the first chamber (4), and the nesting and limiting is that a through hole (92) provided on the first disc (9) is socketed and connected with a boss (43) provided on the inner wall of the first chamber (4).

8. The ink sac according to claim 6, characterized in that One straight edge (91) is provided at each of the two side edges of the first disc (9), and the two straight edges (91) are parallel and opposite to each other. Two planes (42) matching the positions and lengths of the two straight edges (91) are provided on the inner wall of the first chamber (4); two symmetrically arranged through holes (92) are provided on the first disc (9), and two symmetrically arranged bosses (43) and the two through holes (92) on the inner wall of the first chamber (4) are matched.

9. The ink sac according to claim 1, characterized in that At least one circumferentially continuous annular rib (131) is provided on the inner wall of the elastic sealing ring (13).

10. The ink sac according to claim 9, characterized in that The annular rib (131) protrudes 0.3 mm radially from the inner wall of the elastic sealing ring.

Images