Label laser printing production processing feeding and conveying device

Abstract

The application relates to the technical field of label feeding devices, in particular to a feeding and conveying device for label laser printing production and processing, which comprises a mounting frame, the mounting frame is in a U-shaped plate structure, two feeding and conveying shafts are rotationally connected to one side plate of the mounting frame, the two feeding and conveying shafts convey the coiled labels, two limiting discs are arranged on the rod bodies of the feeding and conveying shafts and are distributed on the two sides of the coiled labels, a servo motor is slidingly connected to the other side plate of the mounting frame, a plug block is fixed on the rotating shaft of the servo motor, and the plug block is used for connecting the feeding and conveying shafts; the feeding and conveying shafts serve as transmission structures under the condition of no power, serve as the pushing structures of the coiled labels under the condition of power, or serve as winding structures, that is, one object has multiple uses. The design of one object having multiple uses reduces the equipment cost and the occupation of the production space, and improves the flexibility and efficiency of the production process.

Description

Technical Field

[0001] This invention relates to the field of label feeding device technology, specifically a feeding and conveying device for label laser printing production and processing. Background Technology

[0002] In the label laser printing production process, the material feeding and conveying process is crucial. Existing material feeding and conveying devices have many shortcomings and are insufficient to meet actual production needs.

[0003] Traditional feeding conveyor systems typically only have a simple transmission function, meaning they can only passively rotate as the rolls of labels move, unable to actively provide power for the transport of the labels. In production scenarios requiring precise control of label conveying speed or specific conveying modes, this single-function feeding conveyor cannot meet production requirements. Furthermore, when rolls of labels need to be wound up, additional winding equipment is required, increasing equipment costs and production space occupancy. Summary of the Invention

[0004] The purpose of this invention is to provide a feeding and conveying device for label laser printing production and processing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a feeding and conveying device for label laser printing production and processing, comprising a mounting frame, the mounting frame having a "U"-shaped plate structure, two feeding and conveying shafts rotatably connected to one side plate of the mounting frame, the two feeding and conveying shafts conveying roll labels, two limiting discs sleeved on the rod of the feeding and conveying shafts, the two limiting discs being distributed on both sides of the roll labels, a servo motor slidably connected to the other side plate of the mounting frame, a plug fixed on the rotating shaft of the servo motor, the plug being used to connect the feeding and conveying shafts.

[0006] Preferably, bolt holes are provided on both parallel side plates of the mounting bracket, and a threaded sleeve is fixed on the other side plate of the mounting bracket, with the threaded sleeve corresponding to the bolt holes.

[0007] Preferably, two reserved openings are provided on one side plate of the mounting frame. The reserved openings are in the shape of an "I". A connecting plate is inserted into one side of the reserved opening. One end of the feeding conveyor shaft is fixed to the surface of the connecting plate. A plug plate is inserted into the other end of the reserved opening. The plug plate is in the shape of a "convex" round plate. The plug plate and the connecting plate are connected by multiple screws, and the plug plate and the connecting plate form an "I" round plate.

[0008] Preferably, the outer ring surface of the limiting plate is provided with a side groove, which is an annular groove. Multiple clamping handles are inserted into the surface of the side groove, and the surface of the side groove is provided with external threads. A limiting sleeve is sleeved inside the side groove, and the inner ring opening of the limiting sleeve is provided with internal threads. The internal threads and external threads are connected in a mating manner. One end of the clamping handle is provided with a bevel. After the limiting sleeve squeezes the clamping handle, the clamping handle clamps the feeding conveyor shaft, and the limiting plate is limited on the feeding conveyor shaft.

[0009] Preferably, a rubber ring is fixed inside the side groove. The rubber ring is an L-shaped annular plate. One end of the rubber ring is clamped between the inner ring of the limiting sleeve and the side groove, and the other end of the rubber ring is clamped between the end of the limiting sleeve and the side wall of the side groove. Multiple paddles are fixed on the outer ring surface of the limiting sleeve.

[0010] Preferably, the inner ring surface of the limiting plate is provided with an inner ring groove, and a rubber band is fixed between the two parallel sidewalls of the inner ring groove. The other end of the clamping handle is fixed to the outer ring surface of the rubber band. When the limiting sleeve pushes the clamping handle to clamp the feeding conveyor shaft, the rubber band clamps between the clamping handle and the feeding conveyor shaft and undergoes elastic deformation.

[0011] Preferably, the surface of the insert plate is provided with a slot, the slot is a square groove, the insert is a square column, the insert and the slot are matched, the insert is inserted into the slot, and the other side plate of the mounting bracket is provided with a through hole, the size of the through hole is larger than the cross-sectional size of the insert.

[0012] Preferably, a bracket is provided below the servo motor, and two connecting screws are screwed onto the end plate of the bracket. The connecting screws pass through the end plate of the bracket and are screwed onto the outer wall of the servo motor. A movable sleeve is fixed on the bottom surface of the bracket. The movable sleeve is fitted onto the plate of the guide plate. One end of the guide plate is fixed to the surface of the mounting bracket. The guide plate has an "L" shaped plate structure.

[0013] Preferably, the bottom surface of the guide plate has two positioning holes, the distance between the two positioning holes is greater than the depth of the slot, and a limiting screw is screwed onto the bottom surface of the movable sleeve. The limiting screw passes through the bottom plate of the movable sleeve and is inserted into the positioning hole.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The label laser printing production and processing feeding and conveying device proposed in this invention uses a feeding and conveying shaft as a transmission structure for the roll of labels when the insert block is removed from the slot, guiding the roll of labels as it is pulled and moved. When the push bracket drives the moving sleeve to slide along the guide plate, causing the insert block to insert into the slot and the limiting screw to be inserted into the positioning hole, the servo motor switch is triggered. The servo motor drives the insert block to rotate the feeding and conveying shaft. At this time, the feeding and conveying shaft pushes the roll of labels forward, causing the roll of labels to be conveyed forward. If the end of the roll of labels is wrapped around the feeding and conveying shaft, the feeding and conveying shaft can also be used as a take-up shaft. After removing the limiting plate on one side, the take-up roll of labels can be pulled out from one end of the feeding and conveying shaft. This multi-purpose design reduces equipment costs and production space occupation, and improves the flexibility and efficiency of the production process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the connection structure between the mounting bracket and the servo motor of the present invention;

[0018] Figure 3 This is a top view of the structure of the present invention;

[0019] Figure 4 for Figure 3 Sectional view of the structure at point AA;

[0020] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A in the middle;

[0021] Figure 6 for Figure 4 Enlarged schematic diagram of the structure at point B;

[0022] Figure 7 for Figure 4 Enlarged schematic diagram of the structure at point C;

[0023] Figure 8 for Figure 5 Enlarged schematic diagram of the structure at point D;

[0024] Figure 9 This is a schematic diagram of the connection structure between the feeding conveyor shaft and the limiting plate of the present invention;

[0025] Figure 10 This is a schematic diagram of the limiting disk structure of the present invention;

[0026] Figure 11 This is a schematic diagram of the bracket structure of the present invention;

[0027] Figure 12 This is a schematic diagram of the mounting bracket structure of the present invention.

[0028] In the diagram: 1. Mounting bracket; 2. Reserved opening; 3. Insert plate; 4. Connecting plate; 5. Screw; 6. Feeding conveyor shaft; 7. Roll label; 8. Limiting plate; 9. Inner ring groove; 10. Side groove; 11. Insertion port; 12. Clamping handle; 13. Rubber band; 14. Limiting sleeve; 15. Rubber ring; 16. Paddle; 17. Slot; 18. Insert block; 19. Through hole; 20. Servo motor; 21. Bracket; 22. Connecting screw; 23. Moving sleeve; 24. Guide plate; 25. Positioning hole; 26. Limiting screw; 27. Bolt hole; 28. Threaded sleeve. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 12 This invention provides a technical solution: a feeding and conveying device for label laser printing production and processing, including a mounting frame 1, which has a "U"-shaped plate structure. Two feeding and conveying shafts 6 are rotatably connected to one side plate of the mounting frame 1. The two feeding and conveying shafts 6 convey rolls of labels 7. Bolt holes 27 are provided on the two parallel side plates of the mounting frame 1. A threaded sleeve 28 is fixed on the other side plate of the mounting frame 1, and the threaded sleeve 28 corresponds to the bolt holes 27. Two reserved openings 2 are provided on one side plate of the mounting frame 1. The reserved openings 2 are "I"-shaped round openings. A connecting plate 4 is inserted into one side of the reserved opening 2. One end of the feeding and conveying shaft 6 is fixed to the surface of the connecting plate 4. An insertion plate 3 is inserted into the other end of the reserved opening 2. The insertion plate 3 is a "convex"-shaped round plate. The insertion plate 3 and the connecting plate 4 are connected by multiple screws 5, and the insertion plate 3 and the connecting plate 4 form an "I"-shaped round plate.

[0031] In use, first, fasten the mounting bracket 1 onto the side plate of the laser printer frame. Pass the bolts through the bolt holes 27 on the surface of the frame and mounting bracket 1, then tighten the bolts to fix the mounting bracket 1 to the laser printer. If using a screw to install the mounting bracket 1, first fasten the mounting bracket 1 onto the side plate of the laser printer, then screw the screw into the threaded sleeve 28. Continue screwing until the end of the screw is firmly against one side of the laser printer; at this point, the mounting bracket 1 will not detach from the laser printer. When installing the feeding conveyor shaft 6, first insert the insert plate 3 into one end of the slot of the reserved opening 2, then... The connecting plate 4 is inserted into the slot at the other end of the reserved opening 2, and the insert plate 3 and the connecting plate 4 are connected together by screws 5. Thus, the insert plate 3 and the connecting plate 4 form an "I" shaped circular plate, which is limited in the reserved opening 2 and will not fall off. It can also rotate in the reserved opening 2. After both sets of feeding conveyor shafts 6 are installed in the mounting frame 1, the roll label 7 passes under the feeding conveyor shaft 6 on one side and is wound up on the existing winding equipment after passing over the feeding conveyor shaft 6 on the other side. When the winding equipment is started, the roll label 7 is wound up. At this time, the two feeding conveyor shafts 6 realize the transmission function of the roll label 7.

[0032] Two limiting discs 8 are sleeved on the rod body of the feeding conveyor shaft 6. The two limiting discs 8 are distributed on both sides of the roll label 7. The outer ring surface of the limiting disc 8 is provided with a side groove 10. The side groove 10 is an annular groove. Multiple clamping handles 12 are inserted into the surface of the side groove 10. The surface of the side groove 10 is provided with external threads. A limiting sleeve 14 is sleeved inside the side groove 10. The inner ring of the limiting sleeve 14 is provided with internal threads. The internal threads and external threads are connected. One end of the clamping handle 12 is provided with a slope. After the limiting sleeve 14 squeezes the clamping handle 12, the clamping handle 12 clamps the feeding conveyor shaft 6, and the limiting disc 8 is limited on the feeding conveyor shaft 6. A rubber ring 15 is fixedly fitted inside the side groove 10. The rubber ring 15 is an L-shaped annular plate. One end of the rubber ring 15 is clamped between the inner ring of the limiting sleeve 14 and the side groove 10, and the other end of the rubber ring 15 is clamped between the end of the limiting sleeve 14 and the side wall of the side groove 10. Multiple paddles 16 are fixed on the outer ring surface of the limiting sleeve 14. The inner ring surface of the limiting plate 8 has an inner ring groove 9. A rubber band 13 is fixed between two parallel side walls of the inner ring groove 9. The other end of the clamping handle 12 is fixed to the outer ring surface of the rubber band 13. When the limiting sleeve 14 pushes the clamping handle 12 to clamp the feeding conveyor shaft 6, the rubber band 13 clamps between the clamping handle 12 and the feeding conveyor shaft 6 and undergoes elastic deformation.

[0033] In use, two limiting discs 8 are installed on the plate of the feeding conveyor shaft 6 to limit the rolls of labels 7 of different widths. Multiple limiting discs 8 can be installed on the feeding conveyor shaft 6 to simultaneously guide multiple sets of rolls of labels 7. When installing the limiting discs 8, first screw the limiting sleeve 14 to move it to the outside of the side groove 10. When the limiting sleeve 14 no longer blocks the insertion port 11, one end of the clamping handle 12 extends out of the insertion port 11, and the rubber band 13 is in its initial state. After the limiting disc 8 is placed in the designated position on the feeding conveyor shaft 6, the limiting sleeve 14 is screwed and pushed into the inside of the side groove 10. During this process, the limiting sleeve 14 squeezes and clamps along the slope. As the handle 12 retracts towards the insertion port 11, the tensioned rubber band 13 deforms until it is clamped between the handle 12 and the feeding conveyor shaft 6. At this point, the limiting disc 8 is firmly fixed on the feeding conveyor shaft 6, and one end of the rubber ring 15 is clamped between the limiting sleeve 14 and the side groove 10 to prevent the limiting sleeve 14 from loosening in the side groove 10. When the limiting disc 8 needs to be removed, the limiting sleeve 14 is screwed to move outward from the side groove 10. When the limiting sleeve 14 no longer blocks the insertion port 11, the rubber band 13 rebounds and pulls the handle 12 back. The handle 12 no longer clamps the feeding conveyor shaft 6, and the limiting disc 8 can be pulled off the feeding conveyor shaft 6.

[0034] A servo motor 20 is slidably connected to the other side plate of the mounting bracket 1. A plug 18 is fixed on the shaft of the servo motor 20, and the plug 18 is used to connect to the feeding conveyor shaft 6. A slot 17 is opened on the surface of the insert plate 3. The slot 17 is a square groove. The plug 18 is a square column. The plug 18 matches the slot 17 and is inserted into the slot 17. A through hole 19 is opened on the other side plate of the mounting bracket 1. The size of the through hole 19 is larger than the cross-sectional size of the plug 18. A bracket 21 is provided below the servo motor 20. Two connectors are screwed onto the end plate of the bracket 21. The connecting screw 22 passes through the end plate of the bracket 21 and is screwed onto the outer wall of the servo motor 20. The bottom surface of the bracket 21 is fixed with a movable sleeve 23, which is fitted onto the plate of the guide plate 24. One end of the guide plate 24 is fixed to the surface of the mounting bracket 1. The guide plate 24 has an "L" shaped plate structure. The bottom surface of the guide plate 24 has two positioning holes 25, and the distance between the two positioning holes 25 is greater than the depth of the slot 17. The bottom surface of the movable sleeve 23 is screwed with a limiting screw 26, which passes through the bottom plate of the movable sleeve 23 and is inserted into the positioning hole 25.

[0035] In use, when the insert 18 is pulled out of the slot 17, the feeding conveyor shaft 6 lacks drive. At this time, the feeding conveyor shaft 6 is only used as a transmission structure for the roll label 7. That is, when the roll label 7 is pulled and moved, the feeding conveyor shaft 6 guides the roll label 7. The push bracket 21 drives the moving sleeve 23 to slide along the guide plate 24 until the insert 18 is inserted into the slot 17. Then, the limit screw 26 is turned into the corresponding positioning hole 25 to brake the bracket 21. After triggering the switch of the servo motor 20, the servo motor 20 drives the insert 18 to drive the feeding conveyor. When shaft 6 rotates, the feeding conveyor shaft 6 pushes the roll label 7 forward, causing the roll label 7 to be conveyed forward. If the end of the roll label 7 is wrapped around the feeding conveyor shaft 6, the feeding conveyor shaft 6 can be used as a take-up shaft. After removing the limiting disc 8 on one side, the take-up roll label 7 can be pulled away from one end of the feeding conveyor shaft 6. That is, the feeding conveyor shaft 6 acts as a transmission structure when there is no power, and acts as a pushing structure for the roll label 7 or a take-up structure when there is power. In other words, the feeding conveyor shaft 6 has multiple uses.

[0036] The operating method of the feeding and conveying device for label laser printing production is as follows: Attach the mounting bracket 1 to the side plate of the laser printing equipment frame. Pass the bolts through the bolt holes 27 on the surface of the frame and mounting bracket 1, and then tighten the bolts to fix the mounting bracket 1 to the laser printing equipment. First, attach the mounting bracket 1 to the side plate of the laser printing equipment. Then, screw the screw into the threaded sleeve 28 fixed on the other side plate of the mounting bracket 1. Continue screwing the screw until the end of the screw is firmly against one side of the laser printing equipment. At this point, the mounting bracket 1 is fixed and will not fall off the laser printing equipment. Insert the insert plate 3 into one end of the slot of the reserved opening 2, and insert the connecting plate 4 into the other end of the slot of the reserved opening 2. Connect the insert plate 3 and the connecting plate 4 together using multiple screws 5, so that the insert plate 3 and the connecting plate 4 form an "I"-shaped circular plate, which is confined in the reserved opening 2 and will not fall off, and can rotate within the reserved opening 2. After both sets of feeding conveyor shafts 6 are installed on the mounting frame 1, the roll label 7 is passed under one feeding conveyor shaft 6 and then wound around the other feeding conveyor shaft 6 onto the existing winding equipment. When the winding equipment is started, the roll label 7 is wound up, at which point the two feeding conveyor shafts 6 realize the transmission function of the roll label 7. When installing the limiting plate, the limiting sleeve 14 is screwed to move outward of the side groove 10. When the limiting sleeve 14 no longer blocks the insertion port 11, one end of the clamping handle 12 extends out of the insertion port 11, and the rubber band 13 is in the initial state. The limiting plate 8 is then placed on the designated position of the feeding conveyor shaft 6. Twist and push the limiting sleeve 14 into the side groove 10. During this process, the limiting sleeve 14 pushes the clamping handle 12 along the slope. As the clamping handle 12 retracts into the insertion port 11, it stretches and deforms the rubber belt 13 until the rubber belt 13 is clamped between the clamping handle 12 and the feeding conveyor shaft 6. At this point, the limiting disc 8 is firmly fixed on the feeding conveyor shaft 6. Simultaneously, one end of the rubber ring 15 is clamped between the limiting sleeve 14 and the side groove 10 to prevent the limiting sleeve 14 from loosening in the side groove 10. When removing the limiting disc, twist the limiting sleeve 14 to move it outward from the side groove 10. When the limiting sleeve 14 no longer blocks the insertion port 11, the rubber belt 13 springs back, pulling the clamping handle 12 back, and the clamping handle 12 no longer clamps the feeding conveyor shaft 6. The limiting disc 8 can then be removed from the feeding conveyor shaft 6.

[0037] When the servo motor is connected to the feeding conveyor shaft and its function is switched, in the absence of power (the feeding conveyor shaft acts as a transmission structure): when the insert 18 is pulled out of the slot 17, the feeding conveyor shaft 6 lacks drive. At this time, the feeding conveyor shaft 6 is only used as a transmission structure for the roll label 7, that is, when the roll label 7 is pulled and moved, the feeding conveyor shaft 6 guides the roll label 7. In the presence of power (the feeding conveyor shaft acts as a pushing or winding structure), the push bracket 21 drives the moving sleeve 23 to slide along the guide plate 24 until the insert 18 is inserted into the slot 17. Tightening the limit screw 26 into the corresponding positioning hole 25 brakes the bracket 21. The servo motor 20 is triggered, and the servo motor 20 drives the insert 18 to rotate the feeding conveyor shaft 6. At this time, the feeding conveyor shaft 6 pushes the roll label 7 forward, causing the roll label 7 to be conveyed forward. If the end of the roll label 7 is wrapped around the feeding conveyor shaft 6, the feeding conveyor shaft 6 can be used as a take-up shaft. After removing the limiting plate 8 on one side, the rolled-up roll label 7 can be pulled away from one end of the feeding conveyor shaft 6.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A feeding and conveying device for label laser printing production and processing, comprising a mounting frame (1), characterized in that: The mounting frame (1) has a U-shaped plate structure. In use, the mounting frame (1) is fastened to the side plate of the laser printing equipment frame. Two feeding conveyor shafts (6) are rotatably connected to one side plate of the mounting frame (1). The two feeding conveyor shafts (6) transport the roll label (7). Two limiting discs (8) are sleeved on the rod of the feeding conveyor shaft (6). The two limiting discs (8) are distributed on both sides of the roll label (7). A servo motor (20) is slidably connected to the other side plate of the mounting frame (1). A plug (18) is fixed on the shaft of the servo motor (20). The plug (18) is used to connect the feeding conveyor shaft (6). Two reserved openings (2) are opened on one side plate of the mounting frame (1). The reserved openings (2) are in the shape of an "I". A connecting plate (4) is inserted into one side of the reserved opening (2). One end of the feeding conveyor shaft (6) is fixed to the surface of the connecting plate (4). A insert plate (3) is inserted into the other end of the reserved opening (2). The insert plate (3) is a "convex" shaped round plate. The insert plate (3) and the connecting plate (4) are connected by multiple screws (5). The insert plate (3) and the connecting plate (4) form an "I" shaped round plate. A slot (17) is opened on the surface of the insert plate (3). The slot (17) is a square groove. The insert block (18) is a square column. The insert block (18) matches the slot (17). The insert block (18) is inserted into the slot (17). A through hole (19) is opened on the other side plate of the mounting bracket (1). The groove size of the through hole (19) is larger than the cross-sectional size of the insert block (18). The outer ring surface of the positioning disk (8) is provided with a side groove (10), which is an annular groove. Multiple clamping handles (12) are inserted into the surface of the side groove (10). The surface of the side groove (10) is provided with external threads. A limiting sleeve (14) is fitted inside the side groove (10). The inner ring of the limiting sleeve (14) is provided with internal threads. The internal threads and external threads are connected. One end of the clamping handle (12) is provided with a slope. After the limiting sleeve (14) squeezes the clamping handle (12), the clamping handle (12) clamps the feeding conveyor shaft (6), and the positioning disk (8) is limited on the feeding conveyor shaft (6). The inner ring surface of the positioning disk (8) is provided with an inner ring groove (9). A rubber band (13) is fixed between the two parallel sidewalls of the inner ring groove (9). The clamping handle (12) The other end is fixed to the outer ring surface of the rubber belt (13). When the limiting sleeve (14) pushes the clamping handle (12) to clamp the feeding conveyor shaft (6), the rubber belt (13) is clamped between the clamping handle (12) and the feeding conveyor shaft (6) and generates elastic deformation. A bracket (21) is provided below the servo motor (20). Two connecting screws (22) are screwed on the end plate of the bracket (21). The connecting screws (22) pass through the end plate of the bracket (21) and are screwed to the outer wall of the servo motor (20). A movable sleeve (23) is fixed on the bottom surface of the bracket (21). The movable sleeve (23) is sleeved on the plate of the guide plate (24). One end of the guide plate (24) is fixed on the surface of the mounting frame (1). The guide plate (24) has an "L" shaped plate structure.Two positioning holes (25) are formed on the bottom surface of the guide plate (24). The distance between the two positioning holes (25) is greater than the depth of the slot (17). A limiting screw (26) is screwed onto the bottom surface of the movable sleeve (23). The limiting screw (26) passes through the bottom plate of the movable sleeve (23) and is inserted into the positioning hole (25).

2. The feeding and conveying device for label laser printing production and processing according to claim 1, characterized in that: Bolt holes (27) are provided on the two parallel side plates of the mounting bracket (1), and a threaded sleeve (28) is fixed on the other side plate of the mounting bracket (1). The threaded sleeve (28) and the bolt holes (27) correspond to each other.

3. The material feeding and conveying device for label laser printing production and processing according to claim 1, characterized in that: A rubber ring (15) is fixed inside the side groove (10). The rubber ring (15) is an L-shaped ring plate. One end of the rubber ring (15) is clamped between the inner ring of the limiting sleeve (14) and the side groove (10). The other end of the rubber ring (15) is clamped between the end of the limiting sleeve (14) and the side wall of the side groove (10). Multiple paddles (16) are fixed on the outer ring surface of the limiting sleeve (14).

Images