CN111312017B

CN111312017B - Piano teaching finger training device

Info

Publication number: CN111312017B
Application number: CN202010171724.8A
Authority: CN
Inventors: 徐赛飞
Original assignee: Xuchang University
Current assignee: Xuchang University
Priority date: 2020-03-12
Filing date: 2020-03-12
Publication date: 2022-03-01
Anticipated expiration: 2040-03-12
Also published as: CN111312017A

Abstract

The invention discloses a finger training device for piano teaching, and mainly relates to the field of piano practice tools. Comprises a clamping mechanism, a guide rail mechanism and a supporting mechanism; the clamping mechanisms are two, the two ends of the guide rail mechanisms are symmetrically arranged at the two ends of the piano and used for clamping the piano, the supporting mechanisms slide left and right on the guide rail mechanisms, each supporting mechanism comprises an arc-shaped pad body capable of sliding up and down, and a compression spring capable of pushing the arc-shaped pad body upwards is arranged. The invention has the beneficial effects that: the device can play the roles of warning and regulating actions, does not hinder rhythm control, and does not hurt the wrist.

Description

Piano teaching finger training device

Technical Field

The invention relates to the field of piano practice tools, in particular to a finger training device for piano teaching.

Background

Maintaining correct fingering can be done with great effort for practicing the piano, so that a good habit must be established when the infant is beginners of the piano to maintain good fingering.

A student who cannot play a piano, and not to become a professional player in the future, enters a professional level at least, or reaches a higher level regardless of age, children, teenagers, young mountains and the elderly, and the problem to be solved first is the standing of fingers. Just as a small child starts to learn to walk, others will hold her up. Before the student learned the musical instrument, each finger was very weak. Even with a large age, his fingers are soft. When a person cannot stand stably, the person cannot talk about walking, running and jumping. Standing means supporting. The tip of the first joint of each finger corresponds to a hook on a clothes rack, and the weight of the arms and the whole body of a person is as if a piece of heavy clothes. The clothes are hung on the clothes hanger, the strength of the clothes hanger is sunk on the hook, and the fingertips can support the whole strength on the hung keys. This seems easy and if not solved first, does not give good support. Most of the current student supports for learning lyres are not solved. He does not pay attention to the independent standing of the fingers, and the sequela is caused as if the child cannot stand up and the body is lack of calcium, so that the patient suffers from osteomalacia. Therefore, it is important that each finger can stand alone on the key. Any two fingers are then guaranteed to stand, including 12, 13, 14, 15, 23, 24, 25, 34, 35, 45, ten combinations. Up to three fingers standing, 123, 124, 125, 134, 135, 145, 234, 235, 245, 345, ten combinations. Four fingers stand together, 1234, 1235, 1245, 1345, 2345, five combinations. And to 12345, 5 finger combinations. He required that in each combination stand, the fingers not be flicked off the keyboard, a firm stand is required.

How to train the support of the fingers there is a training sequence, first the support of the training fingers. One finger, preferably starting from three fingers, is naturally dropped one by one on a table or a piano lid to let him stand. However, care should be taken that the wrist is fully relaxed above the wrist and the palm is stiff outward below the wrist, which is called "front-straight and back-loose". The fingers can be used as crab claws. It is known that the feet of a live crab stand very rigidly and the feet of a dead crab hang softly. If the finger looks like the foot of a dead crab, it is impossible to make the key sound well. When observing the walking of the crab, the person can find that when one foot of the crab is grounded, other feet of the crab stand off the ground. This is again similar to our practice. When the three fingers stand on the table firmly, the other fingers need to stand upright. Then, the two fingers, the four fingers, the big finger and the five fingers are exercised in sequence. A single finger can stand back and all combinations previously described are also subject to such exercise. Finally, the keyboard can be trained, and the positions recommended by I are that two, three, four fingers are placed on a black key, and a big finger and a small finger are placed on two white keys (E and C). As this position is suitable for the natural hand shape of a human being. The black keys are higher, but the palms are raised; the white key is lower, and the first and fifth fingers are just at the ground position. These all contribute to the support of the palm.

The fingers can be considered to walk after the fingers walk correctly to stand, and the fingers walk on the musical instrument to learn walking of children. The left leg stands alone, and the whole body weight is on the left leg. When stepping out of the right leg, it is not possible to give up the weight, but to move it to the right leg, whereupon the left leg is lifted ready for a new position. Many people do not notice the most basic simple movement and have the problem that the left leg does not support, the force does not transfer, the person is hurried to stride over the right leg, and the person is sure to lie on the ground and cry. In fact, most students cannot stand with their fingers falling over the harp because he does not learn to "walk" between the two fingers. Such as a finger and two fingers, which transfer force while lifting the fingers, a finger down key, and a finger off key. Then the first and third fingers, the first and fourth fingers, the first and fifth fingers, and the various combinations previously described, are all walked on at this stage. Good walking among the fingers is the basis of the ensemble. Any touch key action has four processes of 'preparing one touch key-continuous-key-off'. The walking is that the force is well transferred from one finger to the other finger, and the force of the former finger is transferred to the support of the latter finger. The two fingers need to have seamless good alternation, and can not be broken or stuck but only connected. This is the concept of walking.

In order to match the "standing" and "walking", it is necessary to develop a muscular habit at the beginning of the exercise and to develop a firm movement pattern. Once the hand and wrist are collapsed, the later correction is quite painful, and the high-order exercise is not performed without correction. There is a certain awareness of self-restraint in adults, but for children and adolescents this self-restraint is rather "distracting", and two or three deformations are sufficient to adversely affect subsequent exercises. Parents cannot keep beside the training device and cannot look at the training device without eyes, and the parents do not have the professional ability of correcting deviation and guiding, so that corresponding auxiliary tools are necessary in the initial training stage of children. It is now popular to use a lifting bar above the side of the key on the front side of the piano (the side closer to the exerciser) to block the wrist of the exerciser. Such lifting bars are very difficult to use when in use. The specific analysis is as follows:

firstly, the lifting rod can basically only span several octaves, the range of limitation and action is very limited, and the structure and the action form of the lifting rod cannot allow the lifting rod to have wide coverage, so the lifting rod is often compared with the chicken ribs.

Moreover, the height of the lifting rod is fixed, however, the hand playing piano is a dynamic 'standing' process, but does not stand still, a user touches the black key upwards, and when pressing the key with multiple fingers, the user inevitably tends to walk downwards, and when playing, the user can feel beautiful and rhythmic, the lifting rod completely limits the vivid 'standing', and the fixed height of the lifting rod plays a bad role in piano fingering training instead, so that students cannot experience the rhythm feeling, and the defect is more beneficial.

In addition, the lifting rod is arranged below the wrist, when the lifting rod is manually rotated, the wrist and the lifting rod are inevitably rubbed, the skin of the wrist is irritated by the friction during repeated practice, pain is slight, the wrist is seriously scratched with red and swelling, the walking feeling is influenced, and the defect is better than the benefit.

In conclusion, the lifting rod cannot be used and abandoned at present, and provides a very urgent problem for teaching and learning.

Disclosure of Invention

The invention aims to provide a finger training device for piano teaching, which can be used for carrying out targeted adjustment according to the age condition, the physical condition and the exercise progress condition of a practicer, can play the roles of warning and regulating actions, does not hinder the rhythm control, and does not hurt the wrist.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a finger training device for piano teaching comprises a clamping mechanism, a guide rail mechanism and a supporting mechanism;

the clamping mechanisms are two, symmetrically arranged at two ends of the guide rail mechanism and comprise an upper fixing frame, a lower fixing frame and a connecting ruler, wherein the upper fixing frame and the connecting ruler are connected in a vertical sliding mode and can limit positions, the lower fixing frame and the connecting ruler are connected in a vertical sliding mode and can limit positions, an inverted L-shaped clamping plate is arranged on the upper fixing frame, an adjusting sleeve is fixed on the lower fixing frame, an adjusting screw rod in threaded fit with the adjusting sleeve penetrates through the adjusting sleeve from top to bottom, an adjusting handle is arranged at the bottom end of the adjusting screw rod, and the top end of the adjusting screw rod is arranged above the adjusting sleeve and is fixed with a cushion;

the guide rail mechanism comprises a linear rail, and two ends of the linear rail are respectively fixed on the upper fixing frames on the same side. The linear guide rail is provided with two sliding tables which slide left and right along the linear guide rail;

the supporting mechanism comprises a mounting rack, the mounting rack is fixed on the sliding table, a lifting block and an adjusting plate which are matched with the lifting block in a lifting mode are arranged on the mounting rack, the lifting block is located above the adjusting plate, a supporting plate which is matched with the lifting block in a sliding mode from top to bottom and can be locked in a limiting mode is arranged on the lifting block, an arc-shaped base plate is arranged on the top end of the supporting plate, the adjusting plate can be locked with the relative height of the mounting rack, a compression spring is arranged between the adjusting plate and the lifting block, and the compression spring has elastic force for pushing up the lifting block.

The outer side end face of the mounting frame is provided with a strip-shaped guide rod extending up and down, the lifting block and the adjusting plate are respectively matched with the guide rod in a vertical sliding manner, the top end of the guide rod is provided with an upper plate body, the bottom end of the guide rod is provided with a lower plate body, the lifting block slides up and down between the upper plate body and the lower plate body,

the fixed pole setting that is equipped with downwardly extending on the bottom surface of elevator, the pole setting is two and bilateral symmetry settings, cup joint compression spring in the pole setting, be equipped with two on the adjusting plate with pole setting clearance fit's first via hole, be equipped with on the lower plate body with pole setting clearance fit's second via hole, first via hole and second via hole are used for making the pole setting run through from top to bottom.

And a lifting screw is fixed below the adjusting plate, is matched with the lower plate body in a lifting way and is fixed with the lower plate body through a nut.

The lower part of the supporting plate is provided with a vertically extending strip-shaped hole, the outer side end face of the lifting block is provided with a stud penetrating through the strip-shaped hole, and a fastening nut is arranged on the stud and used for limiting and fixing the supporting plate on the lifting block.

The arc-shaped backing plate is adapted to the physiological curve of the wrist of a person, and the upper side face of the arc-shaped backing plate is provided with a flexible cushion layer.

One end, far away from the piano, of the upper fixing frame is provided with an upper through hole which is communicated up and down, the upper part of the connecting ruler is communicated with the upper through hole and is in up-and-down sliding fit with the upper through hole, a fastening bolt is communicated with the side wall of the upper through hole through threads, is a butterfly bolt and is vertical to the side wall of the upper through hole;

a lower through hole is formed in one end, far away from the piano, of the lower fixing frame, the lower portion of the connecting ruler penetrates through the lower through hole and is in up-and-down sliding fit with the lower through hole, a fastening bolt in threaded fit with the lower through hole is arranged on the side wall of the lower through hole, and the fastening bolt is a butterfly bolt and is perpendicular to the side wall of the lower through hole;

the connecting ruler is uniformly provided with 20 pin holes for being matched and pinned with the fastening bolt, so that the connecting ruler is fixed with the upper through hole and the connecting ruler is fixed with the lower through hole through matching with the fastening bolt.

The sliding table is provided with an oil filling nozzle, and a lubricating channel communicated with the linear track is arranged in the oil filling nozzle.

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

when the device is used, the guide rail mechanism is fixed on the front side of the piano through the clamping mechanism, the clamping mechanism can adapt to the pianos of different models, the wide applicability is realized, the fixation is firm, and the piano is not damaged. The relative height position of adjustment backup pad and elevator to adapt to different hand types size and upper limbs size, to less child, can be suitable fall down the highest support position, and the suitable height of wrist when children's more than a bit can support according to children, go to adjustment and fixed this highest support height. Thereby being more comfortable for people to use without the bad feeling of restriction and blockage.

Meanwhile, in the aspect of posture constraint of the hand, the arc-shaped base plate has reverse resistance when being pressed downwards, playing can be reminded, and a person presses the wrist, so that the music instrument can warn the player of music instrument action and keep a standard posture all the time. Meanwhile, when the wrist needs to have a certain amplitude of upward and downward rhythm to be corresponding, the wrist is really needed to be matched downwards to find the feeling of playing the piano, and the spring support descending structure can adapt to the downward pressing amplitude needed by playing, is also beneficial to sensing the pressing rhythm and obtains the added playing feeling.

Furthermore, when the hand is going to walk, the arc-shaped pad body always follows the wrist, and the arc-shaped pad body is matched with the playing position of the hand along with the left-right sliding of the guide rail mechanism, so that the hand can smoothly walk without rubbing the wrist, the playing is smoother, the wrist is not damaged, and the fingering training is facilitated.

When the early stage of study, can adjust compression spring's elasticity a little more, that is to say the backup pad is adjusted a little upwards, provides great resistance of pushing down, and the more great warning is played and is not collapsed, and the exercise degree of difficulty at this time is little, also does not basically have complicated operation, and the performance exercise action that needs the wrist cooperation is fresh. Almost go into the door after, can be appropriate turn down the spring resistance, let the pushing down of wrist light more, can enough play the suggestion effect, increase along with the exercise is deepened the exercise degree of difficulty, the cooperation of wrist is also more complicated just so, also is favorable to the person of practicing to come the initiative to control the wrist according to own needs like this.

Drawings

FIG. 1 is a perspective view of the structure of the present invention.

FIG. 2 is an enlarged view of part A of the present invention.

Fig. 3 is an enlarged view of the portion B of the present invention.

Fig. 4 is a perspective view of the support mechanism structure of the present invention.

Fig. 5 is a perspective view of the support mechanism structure of the present invention.

Reference numerals shown in the drawings:

1. an upper fixing frame; 2. a lower fixing frame; 3. connecting a ruler; 4. a pin hole; 5. tightening the bolt; 6. an adjusting sleeve; 7. adjusting the screw rod; 8. a linear track; 9. a sliding table; 10. a mounting frame; 11. an upper plate body; 12. a lower plate body; 13. a lifting block; 14. erecting a rod; 15. a compression spring; 16. an adjustment plate; 17. a support plate; 18. a strip-shaped hole; 19. an arc-shaped backing plate.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.

The instruments, reagents, materials and the like used in the following examples are conventional instruments, reagents, materials and the like in the prior art and are commercially available in a normal manner unless otherwise specified. Unless otherwise specified, the experimental methods, detection methods, and the like described in the following examples are conventional experimental methods, detection methods, and the like in the prior art.

Example (b): piano teaching finger training device

The device designed by the example is innovated greatly on the basis of lifting the rod, and has the following specific structure:

comprises a clamping mechanism, a guide rail mechanism and a supporting mechanism;

a clamping mechanism:

the two clamping mechanisms are symmetrically arranged at two ends of the guide rail mechanism and specifically comprise an upper fixing frame 1, a lower fixing frame 2 and a connecting ruler 3;

an inverted L-shaped clamping plate is arranged at one end, adjacent to the piano, of the upper fixing frame 1, an upper through hole which penetrates through the upper fixing frame 1 from top to bottom is formed in the other end of the upper fixing frame 1, the upper portion of the connecting ruler 3 penetrates through the upper through hole and is in up-and-down sliding fit with the upper through hole, a fastening bolt 5 is matched with a thread penetrating through the side wall of the upper through hole, and the fastening bolt 5 is a butterfly bolt and is perpendicular to the side wall of the upper through hole;

a lower through hole is formed in one end, far away from the piano, of the lower fixing frame 2, a fastening bolt 5 in threaded fit with the lower through hole is arranged on the side wall of the lower through hole, and the fastening bolt 5 is a butterfly bolt and is perpendicular to the side wall of the lower through hole; the lower via hole is penetrated by the connecting ruler 3, and the connecting ruler 3 is in vertical sliding fit with the lower via hole.

Connect evenly distributed on the chi 3 to have 20 pinhole 4 for it is fixed with 5 cooperation pin joints of holding down bolt, thereby through the cooperation with holding down bolt 5, realize connecting chi 3 and the fixed of last via hole to and connect chi 3 and the fixed of via hole down, thereby can adjust the distance between upper mounting bracket 1 and the lower mounting bracket 2.

The one end that lower mount 2 and piano are adjacent is equipped with the adjustment cover 6 of extending from top to bottom, run through from top to bottom in the adjustment cover 6 and be equipped with rather than screw-thread fit's adjusting screw 7, the bottom of adjusting screw 7 is equipped with the adjustment handle, the top setting of adjusting screw 7 is in the top of adjustment cover 6 and is fixed with the cushion.

Fixing this device on the piano that can be firm through fixture, and roughly adjusting the distance between upper mounting bracket 1 and lower mount 2 through tightly deciding bolt 5, rethread adjustment screw 7 further adjustment, very facilitate the use, it is more reasonable to compare current clamping adjustment of lifting the pole, and the piano style of adaptation is more extensive.

A guide rail mechanism:

the guide rail mechanism comprises a linear rail 8, and two ends of the linear rail 8 are respectively fixed on the upper fixing frame 1 at the same side.

Two sliding tables 9 sliding left and right along the linear guide rail are arranged on the linear guide rail, and oil filling nozzles are arranged on the sliding tables 9 and used for increasing sliding lubrication.

The guide rail mechanism is smooth in left-right sliding and basically free of resistance, does not have a blocking feeling when moving left and right in use, and completely focuses on walking of hands.

A support mechanism:

the supporting mechanism comprises a mounting rack 10, the mounting rack 10 is fixed on the sliding table 9,

an upper plate body 11 and a lower plate body 12 are arranged on one side of the mounting rack 10 far away from the piano, the upper plate body 11 is fixed at the top end of the mounting rack 10, the lower plate body 12 is fixed at the bottom end of the mounting frame 10, a strip-shaped guide rod extending up and down is arranged on the outer side end face of the mounting frame 10, the guide rod is matched with a lifting block 13 in a sliding way up and down, a vertical rod 14 extending downwards is fixedly arranged on the bottom surface of the lifting block 13, the two upright posts 14 are arranged symmetrically left and right, the upright posts 14 are sleeved with compression springs 15, the guide rod is also provided with an adjusting plate 16 which is in up-down sliding fit, two adjusting plates 16 are arranged on the adjusting plate 16 and correspond to the vertical rods 14 in up-down position, and a first via hole capable of being in clearance fit with the upright stanchion 14, the lower plate body 12 is provided with a first via hole corresponding to the upper and lower positions of the upright stanchion 14, and can with pole setting 14 clearance fit's second via hole, first via hole and second via hole are used for making pole setting 14 run through from top to bottom. A lifting screw is fixed below the adjusting plate 16, the lifting screw is in lifting fit with the lower plate body 12, and the lifting screw is fixed with the lower plate body 12 through a nut, so that the height of the adjusting plate 16 is adjustable. The upper plate body 11 is positioned at the top end of the guide rod, the lower plate body 12 is positioned at the bottom end of the guide rod, and the lifting block 13 slides up and down between the upper plate body 11 and the lower plate body 12.

The outer side end face of the lifting block 13 is provided with a supporting plate 17 which can be adjusted by 10cm in vertical lifting with the lifting block, the lower part of the supporting plate 17 is provided with a vertically extending strip-shaped hole 18, the outer side end face of the lifting block 13 is provided with a stud penetrating through the strip-shaped hole 18, the stud is provided with a fastening nut for limiting and fixing the supporting plate 17 on the lifting block 13, and the height of the supporting plate 17 relative to the lifting block 13 is finely adjusted, so that the highest height of the supporting plate 17 can be adjusted after the device is fixed. The top of backup pad 17 is equipped with arc backing plate 19, arc backing plate 19 suits with the physiology curve of people's wrist, the side is equipped with flexible bed course on the arc backing plate 19, makes it can not press against and hinder or scotch the wrist when contacting people's wrist.

When the device is used, the guide rail mechanism is fixed on the front side of the piano through the clamping mechanism, the clamping mechanism can adapt to the pianos of different models, the wide applicability is realized, the fixation is firm, and the piano is not damaged. The relative height position of the supporting plate 17 and the lifting block 13 is adjusted, so that when the lifting block 13 is adjusted to rise to the highest point, namely the highest supporting height of the arc-shaped base plate 19 in an unstressed state, the lifting plate is suitable for different hand sizes and upper limb sizes, the influence of the age and limb development of children is very large, the reminding of children aged 6 and children aged 12 and the difference between limbs and hands are very obvious, the height which should be supported by longer fingers is higher, the highest supporting position can be properly dropped for smaller children, and the highest supporting height can be adjusted and fixed by the children who are older according to the proper height of the wrists when the children support. Thereby being more comfortable for people to use without the bad feeling of restriction and blockage.

Meanwhile, in the aspect of posture constraint of the hand, due to the effect of the compression spring 15, the arc-shaped base plate 19 can be adjusted up and down in a certain range, reverse resistance exists when the base plate is pressed down, a use scene is simulated, namely when the wrist is pressed, playing can be reminded, and the wrist is pressed, so that the piano can warn the player to play music and keep a standard posture all the time. Simultaneously, when meeting playing of many buttons to and the great playing of span, perhaps to the exercise of black key, the wrist needs have the rhythm of certain range corresponding from top to bottom, really needs the downward cooperation of wrist to look for the sensation of playing the musical instrument, and this kind of spring support descending structure can adapt to and play required range of pushing down, still helps experiencing the pressure rhythm moreover, obtains the performance sense that adds.

When the player learns in the early stage, the elasticity of the compression spring 15 can be adjusted to be larger, namely the supporting plate 17 is adjusted upwards to provide larger pressing resistance, so that the player can be reminded to play without collapsing more, the exercise difficulty is low at the moment, the player does not basically have complex operation, and the player is required to perform exercise actions by matching the wrist. Almost go into the door after, can be appropriate turn down the spring resistance, let the pushing down of wrist light more, can enough play the suggestion effect, increase along with the exercise is deepened the exercise degree of difficulty, the cooperation of wrist is also more complicated just so, also is favorable to the person of practicing to come the initiative to control the wrist according to own needs like this.

Claims

1. A finger training device for piano teaching is characterized by comprising a clamping mechanism, a guide rail mechanism and a supporting mechanism;

the guide rail mechanism comprises a linear rail, two ends of the linear rail are respectively fixed on the upper fixing frames at the same side, and the linear guide rail is provided with two sliding tables which slide left and right along the linear guide rail;

the supporting mechanism comprises a mounting frame, the mounting frame is fixed on the sliding table, a lifting block and an adjusting plate which can be matched with the mounting frame in a lifting mode are arranged on the mounting frame, the lifting block is located above the adjusting plate, a supporting plate which is matched with the lifting block in a vertical sliding mode and can be locked in a limiting mode is arranged on the lifting block, an arc-shaped base plate is arranged at the top end of the supporting plate, the relative height between the adjusting plate and the mounting frame can be locked, a compression spring is arranged between the adjusting plate and the lifting block, and the compression spring has elastic force for pushing the lifting block upwards;

the bottom surface of the lifting block is fixedly provided with two vertical rods extending downwards, the two vertical rods are arranged in bilateral symmetry, compression springs are sleeved on the vertical rods, two first through holes in clearance fit with the vertical rods are arranged on the adjusting plate, a second through hole in clearance fit with the vertical rods is arranged on the lower plate body, and the first through holes and the second through holes are used for enabling the vertical rods to penetrate through up and down;

a lifting screw is fixed below the adjusting plate, the lifting screw is matched with the lower plate body in a lifting way, and the lower plate body is fixed through a nut;

when the player learns in the initial stage, the elasticity of the compression spring is adjusted to be a little larger, namely the supporting plate is adjusted upwards to provide larger pressing resistance, so that the player is further reminded of not collapsing, the exercise difficulty is low at the moment, the complex operation is basically avoided, and the performance exercise action needing the wrist to be matched is fresh; after entering the door, the resistance of the compression spring is reduced, so that the wrist is pressed down more easily; the device can play a role in prompting, and the matching of the wrists is more complex as the difficulty of deep exercise increases, so that the device is also beneficial for an exerciser to actively control the wrists according to the needs.

2. The finger training device for piano teaching as claimed in claim 1, wherein the supporting plate has a vertically extending bar-shaped hole at its lower portion, and the lifting block has a stud passing through the bar-shaped hole at its outer end face, and the stud has a fastening nut for fixing the supporting plate to the lifting block.

3. The finger training device for piano teaching according to claim 1, wherein the arc-shaped pad is adapted to the physiological curve of the wrist of the person, and a flexible cushion layer is arranged on the upper side of the arc-shaped pad.

4. The piano teaching finger training device of claim 1,

5. The finger training device for piano teaching according to claim 1, wherein an oil filling nozzle is arranged on the sliding table, and a lubricating channel communicated with the linear rail is arranged in the oil filling nozzle.