阅读说明：本技术 一种用于挤压pcb钻针无心磨加工自动收料装置 (Be used for extrudeing automatic material collecting device of centerless grinding processing of PCB drill point ) 是由 徐阳 刘军 许军 陈�胜 于 2021-07-23 设计创作，主要内容包括：本发明公开了一种用于挤压PCB钻针无心磨加工自动收料装置,涉及收料装置技术领域,包括装配在自动收料机机体调节机构上的收料料道机构和用于引导收集磨削液的收料水防机构；收料料道机构的两端分别与无心磨和收料集料机构装配来自动输送无心磨生产的棒料；收料集料机构用于将收料料道机构输出的棒料进行分类收集；收料料道机构的侧面装配有收料传动控制机构来控制棒料的输送速度。本发明可以与现有设备连接,在充分利用安装空间的同时实现连续自动收集；使得不良产品与合格产品得到有效分离,通过收料集料机构的可调节设置,可以兼容不同外径的产品,提高产品外圆加工质量。(The invention discloses an automatic material receiving device for centerless grinding processing of an extrusion PCB drill point, which relates to the technical field of material receiving devices and comprises a material receiving channel mechanism and a material receiving water-proofing mechanism, wherein the material receiving channel mechanism is assembled on an adjusting mechanism of an automatic material receiving machine body; two ends of the material receiving channel mechanism are respectively assembled with the centerless grinder and the material receiving and collecting mechanism to automatically convey the bars produced by the centerless grinder; the material receiving and collecting mechanism is used for classifying and collecting the bars output by the material receiving channel mechanism; the side surface of the material receiving channel mechanism is provided with a material receiving transmission control mechanism to control the conveying speed of the bar material. The invention can be connected with the existing equipment, and realizes continuous automatic collection while fully utilizing the installation space; the poor products and the qualified products are effectively separated, and the products with different outer diameters can be compatible through the adjustable arrangement of the material collecting and collecting mechanism, so that the excircle processing quality of the products is improved.)

1. The automatic material receiving device for extrusion PCB drill point centerless grinding processing is characterized by comprising a material receiving channel mechanism (3) assembled on an automatic material receiving machine body adjusting mechanism (2), wherein two ends of the material receiving channel mechanism (3) are respectively assembled with a centerless grinding mechanism and a material receiving and collecting mechanism (5) and are used for automatically conveying bars produced by the centerless grinding mechanism;

the material receiving and collecting mechanism (5) is used for classifying and collecting the bars output by the material receiving channel mechanism (3);

a material receiving transmission control mechanism (4) is arranged on the side surface of the material receiving channel mechanism (3) and used for controlling the conveying speed of the bar;

the grinding machine also comprises a material receiving water-proof mechanism (1) for guiding and collecting the grinding fluid.

2. The automatic material receiving device for the centerless grinding processing of the extruded PCB drill point as claimed in claim 1, wherein the material receiving channel mechanism (3) comprises a transmission bearing mounting plate (31), a transmission shaft mounting plate (32), a transmission synchronous belt (33), a channel adjusting baffle (34), a channel protection plate (35), a belt pulley tensioning adjusting plate (36), a belt pulley tensioning adjusting nut (37), a transmission fixing shaft (38) and a V-shaped material guiding opening (39), the transmission bearing mounting plate (31), the transmission shaft mounting plate (32), the transmission synchronous belt (33), the belt pulley tensioning adjusting plate (36) and the belt pulley tensioning adjusting nut (37) form a synchronous belt transmission mechanism, the two sides of the synchronous belt transmission mechanism are respectively provided with the channel protection plate (35), and a material receiving transmission control mechanism (4) for providing power for the synchronous belt transmission mechanism is mounted on the outer side surface of any one of the channel protection plate (35), two material channel adjusting baffles (34) symmetrically distributed along the motion direction of a transmission synchronous belt (33) are arranged at the top of the synchronous belt transmission mechanism, a long strip-shaped V-shaped space is formed between the material channel adjusting baffles (34), and a V-shaped material guide opening (39) is formed in one end, close to the centerless grinder, of the long strip-shaped V-shaped space.

3. The automatic material receiving device for the centerless grinding processing of the extrusion PCB drill point as claimed in claim 1, wherein the automatic material receiving machine body adjusting mechanism (2) comprises a material receiving machine mounting plate (21), a vertical adjusting screw (22), a vertical adjusting plate (23) and a horizontal adjusting plate (24), the material receiving machine mounting plate (21) is fixedly connected to the centerless grinding machine through a plurality of vertical adjusting screws (22), the vertical adjusting screws (22) respectively penetrate through the vertical adjusting plate (23) and the horizontal adjusting plate (24) with a calibrated interval, the vertical adjusting plate (23) is abutted to the material receiving channel mechanism (3), and the horizontal adjusting plate (24) is stacked on the top of the material receiving machine mounting plate (21).

4. The automatic material receiving device for the centerless grinding processing of the extrusion PCB drill point as claimed in claim 2, wherein the material receiving transmission control mechanism (4) comprises a stepping speed reduction motor (41) and a speed reduction motor mounting plate (42), the speed reduction motor mounting plate (42) is fixedly connected with the material channel protection plate (35), and the stepping speed reduction motor (41) is fixedly connected on the speed reduction motor mounting plate (42) and penetrates through the speed reduction motor mounting plate (42) and the material channel protection plate (35) to be assembled with the synchronous belt transmission mechanism.

5. The automatic material collecting device for the centerless grinding processing of the extruded PCB drill point as claimed in claim 3, wherein the material collecting water preventing mechanism (1) comprises a main water collecting protective sheet metal (11), the main water collecting protective sheet metal (11) is installed between the material collecting machine mounting plate (21) and the centerless grinding, and three sides of the main water collecting protective sheet metal (11) far away from the centerless grinding are provided with baffles.

6. The automatic material collecting device for the centerless grinding processing of the extruded PCB drill point as claimed in claim 5, wherein one end of the main water-collecting protective metal plate (11) close to the centerless grinding is lower than the opposite end thereof, and the included angle between the main water-collecting protective metal plate (11) and the horizontal plane is adapted to the centerless grinding specification.

7. The automatic material collecting device for the centerless grinding processing of the extruded PCB drill bit as claimed in claim 5, it is characterized in that the material receiving and collecting mechanism (5) comprises a material receiving and collecting hopper (51), a hopper adjusting plate (52) and a broken rod collecting box (53), one end of the hopper adjusting plate (52) is fixedly connected with the bottom of the material receiving channel mechanism (3), the other end of the hopper adjusting plate (52) is abutted in the main body water-collecting protective sheet metal (11), one end of the broken rod collecting box (53) is fixedly connected with the material receiving channel mechanism (3), the other end of the broken rod collecting box (53) is abutted in the hopper adjusting plate (52), the material receiving and collecting hopper (51) is arranged on the top surface of the broken rod collecting box (53), one end of the material receiving and collecting hopper (51) close to the material receiving channel mechanism (3) is lower than the top surface of the material receiving channel mechanism (3).

8. The automatic collecting device for the centerless grinding processing of the extrusion PCB drill point as claimed in claim 7, wherein three sides of the collecting aggregate hopper (51), the hopper adjusting plate (52) and the broken rod collecting box (53) far away from the collecting material channel mechanism (3) are all provided with a baffle plate with a height adapted to the rod material, and one end of the collecting aggregate hopper (51), the hopper adjusting plate (52) and the broken rod collecting box (53) close to the collecting material channel mechanism (3) is respectively higher than the opposite end of the three.

Technical Field

The invention relates to an automatic material receiving device for centerless grinding processing of an extrusion PCB drill point, and belongs to the technical field of material receiving devices.

Background

At present, the extrusion PCB drill point class product on the market processes many varieties, and little work piece product inefficiency in batches is few, can only collect the product that has processed through artifical manual, and the drill point that has processed falls in disorder nature at the discharge gate, can't effectively distinguish qualified product and bad disconnected excellent product, relies on artifical the collection, consumes man-hour. Therefore, need design a section on the manual material receiving processing extrusion PCB drill point's of tradition mode and can receive the material in succession automatically, and need not debug the device of switching to effectual disconnected stick and the normal product of will distinguishing are collected.

At present, the automatic material receiving machine for hard alloy materials in the market can continuously carry out large-batch operation, but cannot automatically receive extruded PCB drill point series, namely small-diameter slender bars, and the variety switching time of part of the material receiving devices is long; aiming at the effects of multiple types, small batch product cost performance, incapability of realizing processing profit maximization, processing efficiency maximization and the like. Therefore, need design a section on current centerless grinder material collecting device and realize automatic material collecting device to the product of extrusion PCB drill point type, can satisfy multiple type to some carbide drill point class products, quick automatic processing of small batch.

The extrusion PCB drill point on the existing market is processed without a heart mill, products can only be collected through manual single-person single-machine operation, rapid collection can not be realized aiming at the characteristics of the extrusion PCB drill point, classification collection is carried out, varieties do not need to be switched, and automatic continuous collection effect is achieved.

Therefore, the invention provides an automatic material receiving device for centerless grinding processing of an extruded PCB drill point, which aims to solve the problems in the background art.

Disclosure of Invention

The invention aims to provide an automatic material receiving device for centerless grinding processing of an extruded PCB drill point, and the automatic material receiving device is used for solving the problems that in the prior art, centerless grinding processing of hard alloy extruded PCB drill point products only depends on manual collection, so that a processing bottleneck exists, and broken bars cannot be quickly distinguished and collected from normal products by manual collection.

According to one aspect of the invention, an automatic receiving device for extrusion PCB drill point centerless grinding processing is provided, which comprises a receiving material channel mechanism and a receiving water prevention mechanism, wherein the receiving material channel mechanism is assembled on an adjusting mechanism of an automatic receiving machine body, the receiving water prevention mechanism is used for guiding and collecting grinding fluid, and two ends of the receiving material channel mechanism are respectively assembled with a centerless grinding mechanism and a receiving material collecting mechanism and used for automatically conveying bars produced by the centerless grinding mechanism;

the material receiving and collecting mechanism is used for classifying and collecting the bars output by the material receiving channel mechanism;

the side surface of the material receiving channel mechanism is provided with a material receiving transmission control mechanism for controlling the conveying speed of the bar material.

According to an exemplary embodiment of the invention, the material receiving channel mechanism comprises a transmission bearing mounting plate, a transmission shaft mounting plate, a transmission synchronous belt, channel adjusting baffles, channel protection plates, a belt pulley tensioning adjusting plate, a belt pulley tensioning adjusting nut, a transmission fixed shaft and a V-shaped material guide opening, the transmission bearing mounting plate, the transmission shaft mounting plate, the transmission synchronous belt, the belt pulley tensioning adjusting plate and the belt pulley tensioning adjusting nut form a synchronous belt transmission mechanism, the two sides of the synchronous belt transmission mechanism are respectively provided with the channel protection plates, the outer side surface of any one channel protection plate is provided with a material receiving transmission control mechanism for providing power for the synchronous belt transmission mechanism, the top of the synchronous belt transmission mechanism is provided with two channel adjusting baffles symmetrically distributed along the movement direction of the transmission synchronous belt, a long strip-shaped V-shaped space is formed between the two channel adjusting baffles, one end of the long strip-shaped V-shaped space, which is close to the centerless grinder, is provided with a V-shaped material guide opening.

According to another exemplary embodiment of the invention, the automatic material receiving machine body adjusting mechanism comprises a material receiving machine mounting plate, a vertical adjusting screw, a vertical adjusting plate and a horizontal adjusting plate, wherein the material receiving machine mounting plate is fixedly connected to the centerless grinder through a plurality of vertical adjusting screws, the vertical adjusting screws respectively penetrate through the vertical adjusting plate and the horizontal adjusting plate with calibrated intervals, the vertical adjusting plate is abutted to the material receiving channel mechanism, and the horizontal adjusting plate is stacked on the top of the material receiving machine mounting plate.

According to another exemplary embodiment of the invention, the material receiving transmission control mechanism comprises a stepping speed reducing motor and a speed reducing motor mounting plate, the speed reducing motor mounting plate is fixedly connected with the material channel protection plate, and the stepping speed reducing motor is fixedly connected to the speed reducing motor mounting plate and penetrates through the speed reducing motor mounting plate and the material channel protection plate to be assembled with the synchronous belt transmission mechanism.

According to another exemplary embodiment of the invention, the material collecting water prevention mechanism comprises a main body water collecting protection metal plate, the main body water collecting protection metal plate is installed between the material collecting machine installation plate and the centerless grinder, and three sides of the main body water collecting protection metal plate, which are far away from the centerless grinder, are provided with baffles.

According to another exemplary embodiment of the invention, one end of the main body water collection protection sheet metal close to the centerless grinder is lower than the opposite end of the main body water collection protection sheet metal, and the included angle between the main body water collection protection sheet metal and the horizontal plane is matched with the centerless grinder specification.

According to another exemplary embodiment of the invention, the material receiving and collecting mechanism comprises a material receiving and collecting hopper, a hopper adjusting plate and a broken rod collecting box, one end of the hopper adjusting plate is fixedly connected to the bottom of the material receiving channel mechanism, the other end of the hopper adjusting plate abuts against the inside of the main water collecting protection metal plate, one end of the broken rod collecting box is fixedly connected with the material receiving channel mechanism, the other end of the broken rod collecting box abuts against the inside of the hopper adjusting plate, the material receiving and collecting hopper is arranged on the top surface of the broken rod collecting box, and one end, close to the material receiving channel mechanism, of the material receiving and collecting hopper is lower than the top surface of the material receiving channel mechanism.

According to another exemplary embodiment of the invention, three sides of the material receiving and collecting hopper, the hopper adjusting plate and the broken rod collecting box, which are far away from the material receiving channel mechanism, are provided with baffle plates with the height matched with that of the rod materials, and one ends of the material receiving and collecting hopper, the hopper adjusting plate and the broken rod collecting box, which are close to the material receiving channel mechanism, are respectively higher than the opposite ends of the three ends.

Compared with the prior art, the invention has the beneficial effects that:

1. the automatic continuous collection device can effectively realize the automatic and batched continuous automatic collection of the drill point products on the basis of the original processing, can be compactly connected with the existing equipment, fully utilizes the installation space, and can also achieve good equipment maintenance and use effects.

2. The invention greatly improves the quality effect of extruding the excircle processing of the PCB drill point type hard alloy product, effectively separates the defective product from the qualified product, quickly, continuously and automatically processes and collects the excircle of the small extruded PCB drill point type hard alloy product, can be compatible with the material receiving machine for products with different outer diameters, and has obvious effects on aspects such as more stable control on the excircle processing quality of the product.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a first perspective view of an automatic material receiving device for centerless grinding of an extruded PCB drill point;

FIG. 2 is a second perspective view of an automatic material receiving device for centerless grinding of an extruded PCB drill point;

FIG. 3 is a front view of an automatic material receiving device for centerless grinding of extruded PCB drill pins;

FIG. 4 is a top view of an automatic material receiving device for centerless grinding of extruded PCB drill pins.

In the figure: 1. a material receiving water prevention mechanism; 2. an adjusting mechanism of the automatic material receiving machine body; 3. a material receiving channel mechanism; 4. a material receiving transmission control mechanism; 5. a material receiving and collecting mechanism; 11. a main body water-collecting protection metal plate; 21. a mounting plate of a material receiving machine; 22. a vertical adjusting screw; 23. a vertical adjustment plate; 24. a level adjustment plate; 31. a drive bearing mounting plate; 32. a transmission shaft mounting plate; 33. a driving synchronous belt; 34. a material channel adjusting baffle; 35. a material channel protection plate; 36. a belt pulley tensioning adjusting plate; 37. a belt pulley tensioning adjusting nut; 38. a transmission fixing shaft; 39. a V-shaped material guide port; 41. a step-by-step reduction motor; 42. a speed reducing motor mounting plate; 51. a material receiving and collecting hopper; 52. a hopper adjusting plate; 53. and (5) a broken rod collecting box.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are further described in detail below by way of examples with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the present invention to an automatic material receiving apparatus for centerless grinding of extruded PCB drill pins.

Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.

According to a general technical concept of the present invention, as shown in fig. 1-4, an automatic material receiving device for centerless grinding processing of an extruded PCB drill point is provided, which comprises an automatic material receiving machine body adjusting mechanism 2, a material receiving transmission control mechanism 4, a material receiving channel mechanism 3, a material receiving and collecting mechanism 5 and a material receiving water-proof mechanism 1. The automatic material receiving machine body adjusting mechanism 2 bears the material receiving transmission control mechanism 4, the material receiving channel mechanism 3, the material receiving and collecting mechanism 5 and the material receiving water prevention mechanism 1, can be quickly installed at the rear end of the existing centerless grinder, and can adjust the horizontal position and the vertical position; the material receiving transmission control mechanism 4 is provided with a stepping speed reducing motor 41, so that the synchronous belt can be effectively and stably driven to stably run through the motor, and stepless speed change can be realized; the material receiving channel mechanism 3 is provided with a transmission synchronous belt 33, a channel adjusting baffle 34, a bearing fixing seat and a belt tensioning adjusting plate, so that fine drill bits can be effectively ensured to sequentially pass through the channel, and material clamping is not caused; the material receiving and collecting mechanism 5 is provided with a material receiving and collecting hopper 51 and a hopper adjusting plate 52, so that normal products can be effectively collected, and broken rods or other bad products can fall to the lower end of the material receiving machine only through the products with set lengths, so that the material receiving and collecting hopper only collects normal and qualified products; receive material water defense mechanism 1 is provided with main part water-collecting protection panel beating 11, through stainless steel protection casing and stainless steel water collector, can effectually guide the water of taking out of bar processing and collect for inside grinding fluid flows back to the lathe once more. The automatic bar material receiving device is simple in structural design, convenient to process and high in use cost performance, and realizes the automatic bar material receiving function of extrusion PCB drill point centerless grinding processing.

The automatic material receiving machine body adjusting mechanism 2 comprises a material receiving machine mounting plate 21, vertical adjusting screws 22, a vertical adjusting plate 23 and a horizontal adjusting plate 24, the material receiving machine mounting plate 21 is fixedly connected to a centerless grinder through the vertical adjusting screws 22, the vertical adjusting screws 22 respectively penetrate through the vertical adjusting plate 23 and the horizontal adjusting plate 24 with calibrated intervals, the vertical adjusting plate 23 is abutted against the material receiving channel mechanism 3, the horizontal height of the material receiving channel mechanism 3 is adjusted by twisting the screws to reach the adjusting plate 24, and then the horizontal height of the material receiving channel mechanism 3 is adjusted; the horizontal adjusting plate 24 is stacked on the top of the mounting plate 21 of the material receiving machine, and the horizontal position of the material receiving channel mechanism 3 can be adjusted by adjusting the position of the horizontal adjusting plate 24, so that the port of the material receiving channel mechanism 3 is connected with the centerless grinder. The automatic material receiving machine body adjusting mechanism 2 can be directly installed in a butt joint mode with equipment on the basis of the existing centerless grinding, so that the installation space is saved, the debugging and installation of a material receiving port are facilitated, and the splashing of other water and oil such as grinding fluid and the like in the machining process is effectively prevented and collected; automatic receive quick-witted organism adjustment mechanism 2 of material adopts simple steel construction to weld the equipment, greatly reduced the processing cost, and to being connected with good bearing effect of other mechanisms.

The material receiving transmission control mechanism 4 is used for matching with the material receiving channel mechanism 3, and can effectively and stably convey products to the material receiving and collecting hopper 51 in sequence through a synchronous belt transmission mechanism which is composed of a transmission bearing mounting plate 31, a transmission shaft mounting plate 32, a transmission synchronous belt 33, a belt pulley tensioning adjusting plate 36 and a belt pulley tension and is used for tightening an adjusting nut to match with the control of the stepping speed reducing motor 41; meanwhile, the two sides of the synchronous belt transmission mechanism are respectively provided with a material channel protection plate 35, the outer side surface of any material channel protection plate 35 is provided with a material receiving transmission control mechanism 4 for providing power for the synchronous belt transmission mechanism, the top of the synchronous belt transmission mechanism is provided with two material channel adjusting baffles 34 which are symmetrically distributed along the motion direction of the transmission synchronous belt 33, a long strip-shaped V-shaped space is formed between the two material channel adjusting baffles 34, so that the bars can be stably transmitted on the transmission synchronous belt 33, and the long strip-shaped V-shaped space is close to a V-shaped material guide port 39 which is convenient for the transposition of the bars and is arranged at one end of the centerless grinder.

The material receiving channel mechanism 3 is provided with a material receiving machine mounting plate 21 and a guide port, so that a product can be stably and accurately transferred to the material receiving and collecting mechanism 5 after being processed by a centerless grinder; meanwhile, a vertical adjusting plate 23, a horizontal adjusting plate 24 and a vertical adjusting screw 22 are further arranged, so that the horizontal position and the vertical position of the whole mechanism can be conveniently and quickly adjusted, and the machine tool can be quickly butted.

The material collecting and collecting mechanism 5 is provided with an open type and inclined material collecting hopper 51 and a hopper adjusting plate 52, so that a large amount of processed products can be stored, and defective products such as broken rods can be distinguished; the material receiving and collecting mechanism 5 is also provided with an adjusting partition plate, and bars with different lengths can be separated through the gap between the adjusting partition plate and the material channel, so that only the grouped bars can be received.

The material collecting water prevention mechanism 1 is provided with a main body water collecting protection metal plate 11, and water brought out by bar processing can be effectively guided and collected through the main body water collecting protection metal plate 11 and a stainless steel water receiving disc; the grinding fluid that flows out in the main part protection panel beating 11 that catchments both can flow into to the stainless steel water collector in, also can directly flow into the lathe for the grinding fluid flows back to inside the lathe once more.

The working principle of the present invention is explained as follows:

the automatic material receiving machine body adjusting mechanism 2 is characterized in that the whole body is connected to a rear-end discharging position of the centerless grinding machine through a material receiving machine mounting plate 21 in the automatic material receiving machine body adjusting mechanism 2, a vertical adjusting plate 23 arranged on the automatic material receiving machine body adjusting mechanism 2 enables the vertical adjusting function of the whole mechanism to be achieved through adjusting a vertical adjusting screw 22, a horizontal adjusting plate 24 arranged on the automatic material receiving machine body adjusting mechanism 2 can achieve the horizontal adjusting function of the whole mechanism, and a material receiving transmission control mechanism 4 is mainly composed of a stepping speed reducing motor 41 and a speed reducing motor mounting plate 42. The transmission synchronous belt 33 is driven by the transmission of the speed reducing motor, so that the products can be sequentially sent out one by one; the material receiving channel mechanism 3 is provided with a transmission bearing mounting plate 31, one end of the transmission bearing mounting plate 32 is fixed, and the other end of the transmission bearing mounting plate is matched and adjusted with a belt pulley tensioning adjusting nut 37 through a belt pulley tensioning adjusting plate 36, so that the tensioning of a synchronous belt is realized; the synchronizing wheel is driven to rotate by the transmission fixed shaft 38; the processed products are sent out from the tail end of the centerless grinder, enter the material receiving channel mechanism 3 through the V-shaped material guide port 39 at the moment, and are transmitted to the material receiving and collecting mechanism 5 through the belt, the products with different outer diameters can be conveyed out by adjusting the material channel adjusting baffle 34, and the material channel protective plate 35 plays a good role in protecting the material receiving channel mechanism 3; the material collecting and collecting mechanism 5 is provided with a hopper adjusting plate 52 and a material collecting and collecting hopper 51, the classified collection of products with different lengths can be realized by adjusting the relative distance between the hopper adjusting plate and the material collecting and collecting hopper, broken rods with too short lengths can directly fall into a broken rod collecting box 53, and the effect of separating and collecting broken rods and normal products is well played; the material receiving water prevention mechanism 1 is provided with a main body water collection protection metal plate 11, and water brought out by bar processing can be effectively guided and collected, so that grinding fluid flows back to the interior of the machine tool again.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.