阅读说明：本技术 一种市政工程用园林宣传栏盖印装置 (Municipal works are with gardens publicity column stamp device ) 是由 刘佳华 于 2021-08-17 设计创作，主要内容包括：本发明涉及一种盖印装置,尤其涉及一种市政工程用园林宣传栏盖印装置。本发明提供一种自动盖印、自动运送宣传栏和自动添印料的市政工程用园林宣传栏盖印装置。一种市政工程用园林宣传栏盖印装置,包括有：底板和第一支撑架,底板上设有第一支撑架；第一滑轨,底板上设有第一滑轨；夹紧机构,第一滑轨上安装有夹紧机构；盖印机构,第一支撑架上安装有盖印机构；盖印块,盖印机构上安装有盖印块。本发明通过设有夹紧机构,夹紧机构与盖印机构配合,能对宣传栏进行夹紧,同时能对宣传栏进行盖印；通过夹紧机构与传动机构配合,能对宣传栏进行运送；通过夹紧机构与卡位机构配合,能实现取出和夹紧宣传栏的工作。(The invention relates to a stamping device, in particular to a garden publicity column stamping device for municipal engineering. The invention provides a garden publicity column stamping device for municipal engineering, which can stamp automatically, convey publicity columns automatically and add printing materials automatically. The utility model provides a municipal works are with gardens publicity column stamp device, including: the bottom plate is provided with a first support frame; the bottom plate is provided with a first sliding rail; the clamping mechanism is mounted on the first sliding rail; the first support frame is provided with a cover printing mechanism; the cover printing block is arranged on the cover printing mechanism. The clamping mechanism is matched with the stamping mechanism, so that the publicity column can be clamped and stamped; the publicity column can be conveyed by matching the clamping mechanism with the transmission mechanism; through the cooperation of clamping mechanism and screens mechanism, can realize taking out and press from both sides the work of tight publicity column.)

1. The utility model provides a municipal works are with gardens publicity column stamp device, characterized by, including:

the device comprises a bottom plate (1) and a first support frame (2), wherein the first support frame (2) is arranged on the bottom plate (1);

the bottom plate (1) is provided with a first sliding rail (3);

the clamping mechanism (5) is mounted on the first sliding rail (3);

the first support frame (2) is provided with a cover printing mechanism (6);

the stamping block (4) is arranged on the stamping mechanism (6).

2. A garden publicity column stamping device for municipal engineering according to claim 1, characterized in that the clamping mechanism (5) comprises:

the first sliding block (51) is arranged on the first sliding rail (3) in a sliding manner;

the first sliding rod (53) is arranged on each of two sides of the first sliding block (51) in a sliding manner;

the clamping blocks (52) are arranged on the two first sliding rods (53);

the first spring (54) is wound on the first sliding rod (53), and the first spring (54) is connected between the first sliding block (51) and the first sliding rod (53).

3. A gardens publicity column stamping device for municipal works according to claim 2, characterized in that, the mechanism of stamping (6) includes:

the first support frame (2) is provided with a first sliding sleeve (61);

the two sides of the first sliding sleeve (61) are both provided with a second sliding rod (62) in a sliding manner, and the two second sliding rods (62) are both connected with the stamping block (4);

the extrusion rod (64) is connected between the two second sliding rods (62);

and the second spring (63) is wound on the second sliding rod (62), and the second spring (63) is connected between the first sliding sleeve (61) and the second sliding rod (62).

4. The garden publicity column stamping device for municipal engineering according to claim 3, characterized by further comprising a transmission mechanism (7), wherein the transmission mechanism (7) further comprises:

the motor (71), the motor (71) is installed on the bottom plate (1);

the bottom plate (1) is provided with a second sliding sleeve (73);

the screw (75) is rotatably connected between the second sliding sleeve (73) and the first support frame (2);

the gear set (72) is connected between the screw (75) and the output shaft of the motor (71);

the material pushing block (74) is arranged on the screw rod (75) in a threaded mode, and the material pushing block (74) is connected with the first sliding block (51) in a sliding mode.

5. The garden publicity column stamping device for municipal engineering according to claim 4, characterized by further comprising an automatic extrusion mechanism (8), wherein the automatic extrusion mechanism (8) further comprises:

the first extrusion block (81) is arranged on the first sliding block (51);

the first telescopic rod assembly (82) is connected between the material pushing block (74) and the first sliding block (51);

the first support frame (2) is provided with a first sliding rail (83), and the first sliding rail (83) is connected with the first sliding sleeve (61);

the third sliding sleeve (84), the second sliding rail (83) is provided with the third sliding sleeve (84) in a sliding way, and the third sliding sleeve (84) is matched with the first extrusion block (81);

the upper side and the lower side of the second sliding rail (83) are respectively wound with a third spring (85), and the third springs (85) are connected between the third sliding sleeve (84) and the first sliding sleeve (61);

the third sliding sleeve (84) is provided with an inclined rod (86);

a fixed block (87), the extrusion rod (64) is provided with the fixed block (87), and the fixed block (87) is matched with the inclined rod (86).

6. The garden publicity column stamping device for municipal works according to claim 5, characterized by further comprising a feeding mechanism (9), wherein the feeding mechanism (9) further comprises:

the first support frame (2) is provided with a second support frame (91), and the second support frame (91) is connected with the first sliding sleeve (61);

the second sliding block (92) is arranged on the second supporting frame (91) in a sliding mode;

the fourth springs (93) are connected between the second sliding block (92) and the second supporting frame (91), and the number of the fourth springs (93) is two;

the upper part of the second sliding block (92) is provided with the oil frame (94);

the material control switch (95) is mounted on the second supporting frame (91), and the material control switch (95) is matched with the oil frame (94);

the discharging frame (96) is arranged on the second sliding block (92), and the discharging frame (96) is connected with the cover printing block (4) in a sliding manner;

the upper part of the second support frame (91) is rotatably provided with an extrusion frame (97), and the extrusion frame (97) is matched with the second sliding block (92);

the upper part of the extrusion rod (64) is provided with a second extrusion block (98), and the second extrusion block (98) is matched with the extrusion frame (97).

7. The garden publicity column stamping device for municipal engineering according to claim 6, characterized by further comprising a clamping mechanism (10), wherein the clamping mechanism (10) further comprises:

the handle (101) is connected between the two first sliding rods (53) in a sliding manner;

the sliding frame (104) is arranged on the first support frame (2) in a sliding mode;

the sliding frame (104) is provided with a clamping block (102), and the clamping block (102) is matched with the handle (101);

the fifth spring (103) is wound on the sliding frame (104), and the fifth spring (103) is connected between the clamping block (102) and the first support frame (2).

8. The garden publicity column stamping device for municipal engineering according to claim 7, characterized in that the material of the fifth spring (103) is an alloy.

Technical Field

The invention relates to a stamping device, in particular to a garden publicity column stamping device for municipal engineering.

Background

The publicity column is a VI application, is the effective means of propaganda such as tissue or enterprise unit, often is applied to places such as gardens, generally adopts the stainless steel to be the frame, toughened glass or endurance board are the panel, the aluminum alloy is the ceiling, in gardens, a lot of publicity columns all need the seal, traditional seal mode generally needs the workman to press, its complex operation and is lengthy, the workman can be tired very irritated for a long time operating simultaneously, reduce the efficiency of seal publicity column.

Patent application No.: CN203780086U discloses an automatic stamping machine, which comprises a casing, etc., wherein a slide bar with a gear is arranged on the guide rail, the gear of the slide bar is engaged with a transmission gear, the lower end of the slide bar is connected with a stamping head, and a position limiting device is arranged on the stamping head at the connection part of the stamping head and the slide bar.

Therefore, the garden publicity column stamping device for municipal engineering is designed to automatically stamp, automatically convey publicity columns and automatically add printing materials.

Disclosure of Invention

In order to overcome the defects that the traditional stamping mode generally needs pressing by workers, the operation is complicated and tedious, meanwhile, the workers are tired and fussy after long-time operation, and the efficiency of stamping publicity columns is reduced, the technical problem of the invention is as follows: the utility model provides an automatic stamp, transport publicity column and automatic add gardens publicity column stamp device for municipal works of seal material automatically.

The technical scheme is as follows: the utility model provides a municipal works are with gardens publicity column stamp device, including:

the bottom plate is provided with a first support frame;

the bottom plate is provided with a first sliding rail;

the clamping mechanism is mounted on the first sliding rail;

the first support frame is provided with a cover printing mechanism;

the cover printing block is arranged on the cover printing mechanism.

Preferably, the clamping mechanism includes:

the first sliding block is arranged on the first sliding rail in a sliding manner;

the first sliding rod is arranged on each of two sides of the first sliding block in a sliding manner;

the two first sliding rods are provided with clamping blocks;

the first spring is wound on the first sliding rod and connected between the first sliding block and the first sliding rod.

Preferably, the printing mechanism includes:

the first support frame is provided with a first sliding sleeve;

two sides of the first sliding sleeve are both provided with a second sliding rod in a sliding manner, and the two second sliding rods are both connected with the stamping block;

the extrusion rod is connected between the two second sliding rods;

and the second spring is wound on the second sliding rod and connected between the first sliding sleeve and the second sliding rod.

Preferably, the device further comprises a transmission mechanism, and the transmission mechanism further comprises:

the motor is arranged on the bottom plate;

the bottom plate is provided with a second sliding sleeve;

the screw is rotatably connected between the second sliding sleeve and the first support frame;

the gear set is connected between the screw and the output shaft of the motor;

the material pushing block is arranged on the screw rod in a threaded mode and is connected with the first sliding block in a sliding mode.

Preferably, the automatic extrusion device further comprises an automatic extrusion mechanism, and the automatic extrusion mechanism further comprises:

the first sliding block is provided with a first extrusion block;

the first telescopic rod assembly is connected between the material pushing block and the first sliding block;

the first support frame is provided with a first sliding rail, and the first sliding rail is connected with the first sliding sleeve;

the second sliding rail is provided with a second sliding sleeve in a sliding manner, and the second sliding sleeve is matched with the first extrusion block;

the upper side and the lower side of the second sliding rail are respectively wound with a third spring, and the third springs are connected between the third sliding sleeve and the first sliding sleeve;

the third sliding sleeve is provided with an inclined rod;

the extrusion device comprises a fixed block, wherein the extrusion rod is provided with a fixed block, and the fixed block is matched with the inclined rod.

Preferably, still including feed mechanism, feed mechanism still includes:

the first support frame is provided with a first support frame, and the first support frame is connected with the first sliding sleeve;

the second sliding block is arranged on the second supporting frame in a sliding mode;

the fourth springs are connected between the second sliding block and the second supporting frame, and the number of the fourth springs is two;

the upper part of the second sliding block is provided with an oil frame;

the material control switch is mounted on the second support frame and matched with the oil frame;

the discharging frame is arranged on the second sliding block and is connected with the stamping block in a sliding manner;

the upper part of the second support frame is rotatably provided with an extrusion frame which is matched with the second sliding block;

and the upper part of the extrusion rod is provided with a second extrusion block which is matched with the extrusion frame.

Preferably, the device further comprises a clamping mechanism, and the clamping mechanism further comprises:

the handle is connected between the two first sliding rods in a sliding manner;

the sliding frame is arranged on the first support frame in a sliding manner;

the fixture block is arranged on the sliding frame and matched with the handle;

and the fifth spring is wound on the sliding frame and connected between the clamping block and the first support frame.

Preferably, the fifth spring is made of an alloy.

Compared with the prior art, the invention has the following advantages: 1. the clamping mechanism is matched with the stamping mechanism, so that the publicity column can be clamped and stamped;

2. the publicity column can be conveyed by matching the clamping mechanism with the transmission mechanism;

3. through the cooperation of clamping mechanism and screens mechanism, can realize taking out and press from both sides the work of tight publicity column.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of the clamping mechanism of the present invention.

Fig. 3 is a schematic perspective view of the capping mechanism according to the present invention.

Fig. 4 is a schematic perspective view of the transmission mechanism of the present invention.

Fig. 5 is a schematic perspective view of the automatic pressing mechanism of the present invention.

Fig. 6 is a schematic perspective view of the feeding mechanism of the present invention.

Fig. 7 is a schematic perspective view of the locking mechanism of the present invention.

Wherein the figures include the following reference numerals: 1. a bottom plate, 2, a first support frame, 3, a first slide rail, 4, a stamping block, 5, a clamping mechanism, 51, a first slide block, 52, a clamping block, 53, a first slide rod, 54, a first spring, 6, a stamping mechanism, 61, a first slide sleeve, 62, a second slide rod, 63, a second spring, 64, an extrusion rod, 7, a transmission mechanism, 71, a motor, 72, a gear set, 73, a second slide sleeve, 74, a pushing block, 75, a screw rod, 8, an automatic extrusion mechanism, 81, a first extrusion block, 82, a first telescopic rod assembly, 83, a second slide rail, 84, a third slide sleeve, 85, a third spring, 86, a slant rod, 87, a fixed block, 9, a feeding mechanism, 91, a second support frame, 92, a second slide block, 93, a fourth spring, 94, an oil frame, 95, a material control switch, 96, a discharge frame, 97, an extrusion frame, 98, a second extrusion block, 10, a clamping mechanism, 101. the handle 102, the fixture block 103, the fifth spring 104 and the sliding frame.

Detailed Description

Although the present invention may be described with respect to particular applications or industries, those skilled in the art will recognize the broader applicability of the invention. Those of ordinary skill in the art will recognize other factors such as: terms such as above, below, upward, downward, and the like are used to describe the accompanying drawings and are not meant to limit the scope of the invention, which is defined by the appended claims. Such as: any numerical designation of first or second, and the like, is merely exemplary and is not intended to limit the scope of the invention in any way.

Example 1

A garden publicity column stamping device for municipal engineering is shown in figures 1-3 and comprises a bottom plate 1, a first support frame 2, a first slide rail 3, a stamping block 4, a clamping mechanism 5 and a stamping mechanism 6, wherein the first support frame 2 is arranged on the upper front portion of the bottom plate 1, the first slide rail 3 is arranged on the upper rear portion of the bottom plate 1, the clamping mechanism 5 is installed on the first slide rail 3, the stamping mechanism 6 is installed on the first support frame 2, and the stamping block 4 is installed on the stamping mechanism 6.

When gardens publicity column needs the impression, the workman is at first on the publicity column clamping mechanism 5 that needs the impression, can press from both sides the publicity column tightly through clamping mechanism 5, promote clamping mechanism 5 and function, thereby it is close to with impression mechanism 6 to drive the publicity column function, slide and cover impression mechanism 6 and function, thereby drive and cover impression block 4 and function, 4 functions of impression block can carry out the impression to the publicity column, stop to slide and cover impression mechanism 6 and can stop the impression, the workman is repeated above step once more and can realize the impression work of publicity column.

The clamping mechanism 5 comprises a first sliding block 51, clamping blocks 52, first sliding rods 53 and first springs 54, the first sliding block 51 is slidably arranged on the first sliding rail 3, the first sliding rods 53 are slidably arranged on the left side and the right side of the first sliding block 51, the clamping blocks 52 are respectively arranged on the front portions of the two first sliding rods 53, the first springs 54 are wound on the first sliding rods 53, and the first springs 54 are connected between the first sliding block 51 and the first sliding rods 53.

When the publicity column needs to be clamped, a worker pushes the first sliding rod 53 backwards, the first spring 54 is stretched, so that the clamping block 52 is driven to move backwards, when the gap between the clamping block 52 and the first sliding block 51 is large, the worker can place the publicity column between the gap, and then the first sliding rod 53 is rapidly loosened to reset the first spring 54, so that the first sliding rod 53 and the clamping block 52 are driven to reset, the clamping block 52 resets to clamp the publicity column tightly, and the publicity column is clamped tightly, so that the publicity column is clamped.

The stamping mechanism 6 comprises a first sliding sleeve 61, a second sliding rod 62, a second spring 63 and an extrusion rod 64, the first sliding sleeve 61 is arranged on the first support frame 2, the second sliding rod 62 is arranged on the upper side and the lower side of the front portion of the first sliding sleeve 61 in a sliding mode, the two second sliding rods 62 are connected with the stamping block 4, the extrusion rod 64 is connected between the front portions of the two second sliding rods 62, the second spring 63 is wound on the second sliding rods 62, and the second spring 63 is connected between the first sliding sleeve 61 and the second sliding rod 62.

When the stamping mechanism 6 is used, the publicity column is close to the stamping mechanism 6 at the moment, the worker pushes the extrusion rod 64 backwards, so that the second sliding rod 62 and the stamping block 4 are driven to move backwards, the second spring 63 is compressed, the stamping block 4 can stamp the publicity column, after the publicity column is stamped, the worker loosens the extrusion rod 64 to reset the second spring 63, and the second sliding rod 62, the extrusion rod 64 and the stamping block 4 are driven to move forwards to reset.

Example 2

On the basis of embodiment 1, as shown in fig. 4-7, the device further includes a transmission mechanism 7, the transmission mechanism 7 further includes a motor 71, a gear set 72, a second sliding sleeve 73, a material pushing block 74 and a screw 75, the motor 71 is installed on the left portion of the bottom plate 1, the second sliding sleeve 73 is located in front of the motor 71, the screw 75 is rotatably connected between the second sliding sleeve 73 and the first support frame 2, the gear set 72 is connected between the left portion of the screw 75 and an output shaft of the motor 71, the material pushing block 74 is threaded on the screw 75, and the material pushing block 74 is slidably connected with the first sliding block 51.

When the publicity column needs to be conveyed, the starting motor 71 rotates, the output shaft of the motor 71 rotates to drive the gear set 72 to rotate, so as to drive the screw rod 75 to rotate, and further drive the material pushing block 74 to move rightwards, when the material pushing block 74 moves rightwards to the rear of the first slider 51, the material pushing block 74 can drive the first slider 51 to move rightwards, the first slider 51 moves rightwards to drive the publicity column to move rightwards, so that the conveying work of the publicity column is realized, then the sealing block 4 can seal the publicity column, after the sealing of the publicity column is completed, a worker controls the motor 71 to rotate reversely, so as to drive the gear set 72 and the screw rod 75 to rotate reversely, and further drive the material pushing block 74, the first slider 51 and the publicity column to move leftwards to reset, and then the worker takes out the publicity column.

The automatic extrusion mechanism 8 further comprises an automatic extrusion mechanism 8, the automatic extrusion mechanism 8 further comprises a first extrusion block 81, a first telescopic rod assembly 82, a second sliding rail 83, a third sliding sleeve 84, a third spring 85, an inclined rod 86 and a fixed block 87, the first extrusion block 81 is arranged at the left part of the first sliding block 51, the first telescopic rod assembly 82 is connected between the pushing block 74 and the first sliding block 51, the first telescopic rod assembly comprises a sixth sliding rod and a sixth spring, the sixth sliding rod is wound with the sixth spring, the sixth spring is connected between the pushing block 74 and the first sliding block 51, the second sliding rail 83 is arranged at the left part of the first support frame 2, the second sliding rail 83 is connected with the first sliding sleeve 61, a third sliding sleeve 84 is arranged on the second sliding rail 83 in a sliding mode, the third sliding sleeve 84 is matched with the first extrusion block 81, the third spring 85 is wound on the upper side and the lower side of the second sliding rail 83, the third spring 85 is connected between the third sliding sleeve 84 and the first sliding sleeve 61, an inclined rod 86 is arranged on the front side of the third sliding sleeve 84, a fixed block 87 is arranged on the extrusion rod 64, and the fixed block 87 is matched with the inclined rod 86.

The material pushing block 74 moves rightwards to drive the first extruding block 81, the first sliding block 51 and the first telescopic rod assembly 82 to move rightwards, the first extruding block 81 moves rightwards to be in contact with the third sliding sleeve 84 so as to extrude the third sliding sleeve 84 to move rightwards, the third spring 85 is compressed, the fixing block 87 is further pushed to move backwards, the second sliding rod 62, the extruding rod 64 and the stamping block 4 are further driven to move backwards, the second spring 63 is compressed, the first sliding block 51 moves backwards to be in contact with the first supporting frame 2, the material pushing block 74 slides rightwards on the first sliding block 51 at the moment, the first telescopic rod assembly 82 is compressed, the first supporting frame 2 can prevent the first sliding block 51 from excessively moving rightwards, the stamping block 4 moves backwards to stamp the publicity column, so that the publicity column is stamped accurately positioned, when the material pushing block 74 moves leftwards, the material pushing block 74 moves leftwards to drive the first telescopic rod assembly 82 to reset, meanwhile, the pushing block 74 moves leftwards to drive the first sliding block 51, the first extruding block 81 and the first telescopic rod assembly 82 to move leftwards to reset, and when the first extruding block 81 moves leftwards to reset and is not in contact with the third sliding sleeve 84, the third spring 85 resets to drive the third sliding sleeve 84 and the inclined rod 86 to move leftwards to reset, so that the second spring 63 resets, and the second sliding rod 62, the extruding rod 64, the stamping block 4 and the fixed block 87 are driven to move forwards to reset.

The feeding mechanism 9 further comprises a feeding mechanism 9, the feeding mechanism 9 further comprises a second supporting frame 91, a second sliding block 92, a fourth spring 93, an oil frame 94, a material control switch 95, a discharging frame 96, an extrusion frame 97 and a second extrusion block 98, the second supporting frame 91 is arranged at the upper right part of the first supporting frame 2, the second supporting frame 91 is connected with the first sliding sleeve 61, the second sliding block 92 is arranged on the second supporting frame 91 in a sliding mode, the fourth spring 93 is connected between the second sliding block 92 and the second supporting frame 91, the number of the fourth springs 93 is two, the oil frame 94 is arranged at the upper part of the second sliding block 92, the material control switch 95 is arranged on the second supporting frame 91, the material control switch 95 is matched with the oil frame 94, the discharging frame 96 is arranged at the left side of the second sliding block 92, the discharging frame 96 is connected with the cover printing block 4 in a sliding mode, the extrusion frame 97 is arranged at the front side of the upper part of the second supporting frame 91 in a rotating mode, the extrusion frame 97 is matched with the second sliding block 92, the right side of the upper part of the extrusion rod 64 is provided with a second extrusion block 98, and the second extrusion block 98 is matched with the extrusion frame 97.

When the extrusion rod 64 moves backwards, the extrusion rod 64 moves backwards to drive the second extrusion block 98 to move backwards, so as to drive the extrusion frame 97 to swing rightwards, the initial state of the material control switch 95 is open, at the moment, the material discharge frame 96 can add printing material to the printing block 4, the extrusion frame 97 drives the second sliding block 92 and the oil frame 94 to move rightwards, the fourth spring 93 is compressed, when the oil frame 94 moves rightwards to be not in contact with the material control switch 95, the material control switch 95 is closed, the material discharge frame 96 moves rightwards to be not in contact with the printing block 4, the material discharge frame 96 temporarily does not add printing material to the printing block 4, when the extrusion rod 64 moves forwards, the extrusion rod 64 moves forwards to drive the second extrusion block 98 to move forwards to reset, the fourth spring 93 resets, so as to drive the second sliding block 92, the oil frame 94, the material control switch 95, the material discharge frame 96 and the extrusion frame 97 to move leftwards to reset, at the moment, the material control switch 95 is in the open initial state, the outfeed tray 96 refills the overhead impression block 4.

The clamping mechanism 10 further comprises a handle 101, a clamping block 102, a fifth spring 103 and a sliding frame 104, the handle 101 is connected between the two first sliding rods 53 in a sliding mode, the sliding frame 104 is arranged at the rear portion of the first support frame 2 in a sliding mode, the clamping block 102 is arranged on the front side of the sliding frame 104, the clamping block 102 is matched with the handle 101, the fifth spring 103 is wound on the sliding frame 104, and the fifth spring 103 is connected between the clamping block 102 and the first support frame 2.

When a worker needs to take out the printed publicity column, the worker pushes the handle 101 backwards to drive the first sliding rod 53 and the clamping block 52 to move backwards, the first spring 54 is stretched, the handle 101 presses the clamping block 102 and the sliding frame 104 to move downwards, the fifth spring 103 is compressed, when the handle 101 moves backwards to be not contacted with the sliding frame 104 and the clamping block 102, the fifth spring 103 is reset to drive the clamping block 102 and the sliding frame 104 to move upwards to reset, at the moment, the clamping block 102 can fix the handle 101, the clamping block 52 is temporarily not contacted with the printed publicity column, then the worker can take away the printed publicity column, then the worker can replace the publicity column to be printed and put between the gaps, then the worker presses the clamping block 102 downwards to reset the first spring 54, so as to drive the first sliding rod 53, the clamping block 52 and the handle 101 to move forwards to reset, the clamping block 52 resets to clamp the publicity column, thus, the work of taking out and clamping the publicity column is realized.

The embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the innovative features set forth in the claims.