Cover device of grinding machine

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a cover device for a cylindrical grinding machine that grinds the outer surface of a roughly cylindrical workpiece, and in particular, sets the grindstone base in the longitudinal direction of the workpiece in order to align the grindstones at a plurality of machining points in the longitudinal direction of the workpiece. The present invention relates to a cover device suitable for a grinding machine of a type that can be traversed and indexed.

【0002】

[Conventional technology]

Generally, in a cylindrical grindstone, a headstock and a tailstock are mounted on a bed, and both centers or chucks and centers provided on these facing surfaces support both ends of the cylindrical work to rotate the work. In this state, the grindstone base is fed in a direction crossing the longitudinal direction of the work, and the work is ground by a rotating grindstone supported by the grindstone base.

【0003】

Recently, in order to reduce the size of the grinding machine itself, the so-called grindstone platform traverse feed mechanism, which has been conventionally used for large grinding machines such as roll grinding machines, has come to be applied to medium-sized grinding machines. In the grinding machine equipped with this traverse feed mechanism, the headstock and tailstock are fixed on the bed, the grindstone base is mounted on the intermediate base so that it can advance and retreat to the work, and this intermediate base is traversed in the longitudinal direction of the work. It can be fed, and the grindstone on the grindstone stand is aligned and indexed at the processing location of the work.

【0004】

The conventional cover device used in a grinding machine with such a grindstone traverse structure is a type in which the headstock, tailstock, intermediate base, and grindstone stand on the bed are confined in one common space. The scattering area of the coolant supplied to the grinding point, which is the contact point between the work and the work, is limited to this one space to prevent the coolant from scattering to the outside of the machine. In this case, a pair of front and rear guide surfaces for guiding the traverse motion of the intermediate base are covered with a telescopic cover to prevent coolant from entering the guide surfaces.

【0005】

Further, in a small grinding machine having a small traverse momentum of the grindstone, a local cover device for partitioning a processing area between the headstock and the tailstock is provided, and the head of the grindstone is penetrated into the local cover device. Those that adopt the configuration are also known.

【0006】

[Problems to be Solved by the Invention]

However, when adopting a so-called overall cover type cover device that confine the headstock, tailstock, intermediate base, and grindstone base on the bed in one common space, the traverse of the intermediate base is used as described above. In addition to the need for a guide surface cover that covers the guide surface for exercise, the mist of coolant mixed with grinding debris is scattered on the headstock, tailstock and grindstone base, so that these devices are contaminated. Inevitably, it makes maintenance and inspection of these devices difficult.

【0007】

In addition, the local cover device used for small grinding machines is suitable for small devices with a traverse momentum of about 100 mm on the intermediate base on which the grindstone stand is mounted, but it is relatively long, for example, a camshaft for an automobile engine. If you have to increase the traverse momentum of the grindstone to grind the workpiece, place the head of the large grindstone in the local cover and align it with all the machining points of the workpiece in this cover. The fact is that it cannot be practically adopted because it is difficult to traverse the grindstone stand over a large range of movement.

【0008】

Therefore, the present invention solves the problems of these conventional overall cover devices, and in particular, the coolant that prevents contamination of the rear side of the grindstone stand and guides the traverse motion of the intermediate base is scattered from the grinding point. It is an object of the present invention to provide a cover device for a grinding machine which has been prevented from being contaminated.

【0009】

[Means for solving problems]

In order to solve the above-mentioned problems and achieve the object, the cover device according to claim 1 supports the bed and both ends of the work to be ground, which are arranged apart from each other in the first horizontal direction on the bed. The first and second work support devices that rotationally support the work around the rotation axis extending in the first horizontal direction and the first work support device on the bed at a position separated in the second horizontal direction across the rotation axis of the work. In a grinding machine provided with an intermediate base that can be moved in the horizontal direction and a grindstone table that is guided on the intermediate base so as to be able to advance and retreat in the second horizontal direction to rotate and support the grindstone, one side surface side of the grindstone table. The movement of the intermediate base is composed of a first cover having a vertical wall element provided in the wheel and whose cover area is variable with the movement of the intermediate base, and a vertical wall element provided on the other side surface side of the grindstone stand. A second cover whose cover area is variable is provided, and the space on the bed is divided into the front space and the rear in the second horizontal direction by the first and second covers and the grindstone stand located between these covers. It is characterized by being divided into two parts with the side space.

【0010】

According to the cover device according to claim 1, when the intermediate base on which the grindstone stand is traversed, the first cover provided on one side surface side of the grindstone stand and the other side surface side of the grindstone stand are provided. The second cover is changed with the traverse motion of the intermediate base, and the vertical wall part of these covers cooperates with the grindstone stand to divide the space on the bed into two spaces, a front space and a rear space. Therefore, the coolant supplied to the grinding point and scattered from the grinding point is not scattered in the rear space of the bed, and the scattering area is limited to the front space only.

【0011】

Preferably, one of the first and second covers is composed of a telescopic cover and the other is composed of a bellows cover so that the grindstone stand can be brought closer to the bellows cover side. Further, the first and second covers may be guided by a frame at the upper and lower ends, or may be supported by a pantograph without providing a frame.

【0012】

Further, as described in claim 2, the cover device according to the present invention comprises a frame member that forms a substantially rectangular space surrounding the grindstone stand and the grindstone guard fixed to one side surface side of the grindstone stand. Provided on the intermediate base, the end portion of the first cover on the grindstone stand side is attached to one of the two vertical column portions of the frame member, and the end portion of the second cover on the grindstone stand side is the other of the vertical column portions of the frame member. It is characterized by being attached to.

【0013】

Since the intermediate base is provided with a frame member for forming a rectangular space surrounding the grindstone base and the grindstone guard, the grindstone stand and the grindstone guard are advanced and retreated in the rectangular space of the frame member when advancing and retreating to the work. , It becomes easy to seal the inside of the frame member with the outer surface of the grindstone stand and the grindstone guard. Further, when the intermediate base traverses, the strut portions on both sides of the frame member change the cover areas of the first cover and the second cover.

【0014】

Preferably, the frame member is formed in a gantry shape in which the lower ends of the support members on both sides are fixed to the intermediate base and the upper ends are connected by cross members, but the support members on both sides are connected to each other by the upper and lower cross members. It may be a square frame structure.

【0015】

The cover device according to claim 3 comprises a vertical back wall portion facing the first cover and a vertical inner wall portion extending in a direction perpendicular to the first cover and facing the second work support device. The second work support device consists of a third cover that covers the rear and inner surfaces, a vertical back wall portion that faces the second cover, and a vertical inner wall portion that extends in a direction perpendicular to the second cover and faces the first work support device. A fourth cover covering the rear surface and the inner side surface, an upper portion of a processing area partitioned between the inner wall portions of the third and fourth covers facing each other, and a front portion facing the grindstone with the work in between. It is characterized by further providing a movable fifth cover that selectively closes and opens.

【0016】

According to the third aspect of the present invention, the third cover covers the two surfaces facing the processing area of the first work support device, and the fourth cover covers the two surfaces facing the processing area of the second work support device. Cover, and further open and close the upper and front portions of the machined area formed between the opposing inner wall portions of the third and fourth covers. The coolant supplied to the grinding point and scattered from this grinding point is confined in the space surrounded by the 1st to 5th covers to prevent the coolant from scattering to the rear part of the grindstone stand, as well as the 1st and 1st. 2 It is also prevented from scattering on the work support device. By providing the back wall portions of the 3rd and 4th covers in close proximity to the 1st and 2nd covers, respectively, most of the scattered coolant is confined in the processing area between the inner wall portions of the 3rd and 4th covers. ..

【0017】

The cover device according to claim 4 further includes a sixth cover fixed to the bed, the sixth cover being above the first and second work support devices and the back walls of the first and third covers. It is characterized in that the upper part between the portions and the upper part between the second cover and the back portion of the fourth cover are closed.

【0018】

The sixth cover closes above the first and second work support devices to prevent coolant from splashing onto the top surfaces of these devices, and also over the space defined by the first to fifth covers between them. Also closed to prevent the scattered coolant and coolant mist passing through these upper spaces from being scattered from above the space. The sixth cover may be formed of a single plate, or may be formed by combining a plurality of plate members.

【0019】

The cover device according to claim 5 is characterized in that the fourth cover is divided into a back wall portion fixed to the bed and an inner wall portion fixed to the second work support device whose position can be adjusted in the first horizontal direction. And.

【0020】

By attaching the inner wall portion of the 4th cover to the 2nd work support device in this way, when the position of the 2nd work support device is adjusted according to the length of the work, the position of the 4th cover is changed to the 2nd work support device. The need for individual adjustment is eliminated from the position adjustment of.

【0021】

Preferably, the portion of the inner wall portion of the fourth cover in contact with the back wall portion is widened in the position adjustment direction of the second work support device to expand the wrap with the back wall portion, thereby forming the inner wall portion and the back wall portion. It is desirable to reduce the coolant that leaks from the gap and reaches the second work support device.

【0022】

The cover device according to claim 6 closes the side surface of the bed that occupies the rear space of the bed with a visible cover that makes the inside visible from the outside, and a part of the visible cover is the rear space of the bed. It is characterized by having an opening / closing door for entering and exiting.

【0023】

When the control panel is placed on the rear side of the bed and the rear side is closed, the operator carelessly enters the rear space of the bed by covering the side surface of the bed that occupies the rear space of the bed. To prevent. In this case, by forming the cover covering both side surfaces with a member capable of observing the inside thereof, it is possible to detect an abnormality occurring in various devices provided in the space behind the bed from outside the machine. Preferably, the member that can see the inside of the cover can be formed of a transparent plate, a mesh plate, or the like.

【0024】

BEST MODE FOR CARRYING OUT THE INVENTION

1 to 7 show an embodiment of a cover device in a grinding machine according to the present invention.

【0025】

FIG. 1 is a perspective view showing the appearance of the grinding machine 1. On the bed 2 of the grinding machine 1, the outer covers 3 and 4 (the sixth cover of the claim) that cover the front side thereof and are connected by the connecting portion 3a, and the visible cover 6 that covers the rear side surface thereof are placed. Has been done. A sliding door 5 (the fifth cover of the claim) that opens and closes when the work W is carried in and out is provided between the outer covers 3 and 4 on the front side. The slide door 5 slides so as to appear and disappear with respect to the outer cover 3 side when opened. The visible cover 6 surrounds the rear side of the side surface of the grinding machine 1, and as shown in FIG. 8, the side surface is composed of a wire mesh having a door, and the rear side thereof is from a frame surrounding the control panel and the pump unit (not shown). Become.

【0026】

The outer covers 3 and 4 and the visible covers 6 shown by the broken lines in FIG. 2 are fixed to the columns 18 and 19 erected on both sides on the bed 2. Further, on the front side on the bed 2, the headstock 7 (the first work support device according to the claim) is provided so as to be separated from each other and holds a shaft-shaped work (for example, an engine camshaft or a crankshaft) W. And a table 9 on which the tailstock 8 (the second work support device of the claim) is placed are fixedly provided. The headstock 7 is fixed on the table 9, and the tailstock 8 is movably mounted and fixed on the table 9 according to the length of the work W. Then, the work W sandwiched between the headstock 7 and the tailstock 8 is rotationally driven around the axis (C axis) by the spindle provided on the headstock 7. The C axis is an axis extending in the first horizontal direction of the claims.

【0027】

Further, on the bed 2, the intermediate base 10 shown in FIGS. 3 and 4 guides the V-shaped guide surface 31 and the flat guide surface 32 extending in the Z-axis direction parallel to the C-axis (the first horizontal direction of the claims). It is provided so that it can be moved. Then, on the intermediate base 10, a grindstone table 11 provided with a grindstone G for grinding the work W at the tip is in the X-axis direction (the second horizontal direction of the claim) which is horizontal and perpendicular to the C-axis and the Z-axis. ) Is movable. The grindstone wheel G rotates around the grindstone axis parallel to the C axis, and is covered with a grindstone guard 12 which is attached to the grindstone stand 11 and has an opening on the work W side.

【0028】

The grinding machine 1 configured in this way controls the rotation of the work W around the C axis, the feed of the X-axis of the grindstone table 11, the feed of the intermediate base 10 in the Z-axis direction, and the rotation of the grindstone G. Grind the work W into a desired shape. Coolant is supplied to this grinding point from a coolant nozzle (not shown), and a groove 13 for collecting the coolant and chips after grinding is formed on the bed 2 below the grinding point. The groove 13 has an appropriate width in the X-axis direction and is formed so as to extend in the Z-axis direction, and guides the coolant and chips dropped from the grinding point to the gutter 14 attached to the side surface of the bed 2. It has become like.

【0029】

As shown in FIG. 4, a gate-shaped frame member 15 is attached to the front (work W side) of the intermediate base 10 on which the grindstone stand 11 is placed, and the grindstone stand 11 advances and retreats through the frame member 15. It is designed to do. The inner peripheral surface of the frame member 15 and the outer peripheral surfaces of the grindstone base 11 and the grindstone guard 12 have substantially the same shape (rectangular shape) when viewed from the front surface of the machine (work W side), and have a slight gap. Face to face.

【0030】

As shown in FIG. 5, the inner end portion of the telescopic cover 16 (first cover according to the claim) can be expanded and contracted in the Z-axis direction on the support column portion on the headstock 7 side (left side in the drawing) of the frame member 15. It is attached. Further, the inner end portion of the bellows cover 17 (second cover according to the claim) is attached to the strut portion on the tailstock 8 side (right side in the drawing) of the frame member 15 so as to be expandable and contractible in the Z-axis direction. The outer end of the telescopic cover 16 is attached to the support column 18 installed on the above-mentioned gutter 14 on the side surface of the bed 2 on the headstock 7 side (left side in the drawing). The outer end of the bellows cover 17 is attached to the support column 19 installed on the bed 2 on the tailstock 8 side (right side in the figure).

【0031】

The upper surfaces of the frame member 15, the telescopic cover 16 and the bellows cover 17 face the beam 20 connecting the tops of the columns 18 and 19 with a slight gap. As shown in FIG. 6, which is an AA cross section of FIG. 1, the above-mentioned outer covers 3 and 4 are bolted to the beam 20 so as to close the beam 20 above the beam 20. Further, the beam 20 has a U-shaped cross section and the lower surface is open, and an upper guide 21 for guiding the upper ends of both covers 16 and 17 in the Z-axis direction via a large number of rollers R1 is provided in the internal space thereof. Has been done. Both ends of the upper guide 21 are fixed to columns 18 and 19. On the other hand, on the back side of the lower end portions of both covers 16 and 17, the lower end portions of both covers 16 and 17 are guided in the Z-axis direction by a large number of rollers R2 that roll along the side surface of the groove 13. Since the upper guide 21 is offset rearward with respect to the center of both covers 16 and 17 in the thickness direction, both covers 16 and 17 are designed to press the roller R2 at the lower end against the side surface of the groove 13 by their own weight. ..

【0032】

The telescopic cover 16 and the bellows cover 17 configured in this way expand and contract with each other while following the movement of the intermediate base 10 in the Z-axis direction. Therefore, the coolant and chips scattered by grinding do not enter the rear space on the bed 2 partitioned by the covers 16 and 17.

【0033】

A headstock cover consisting of a vertical back wall surface portion 23a, a vertical inner wall portion 23b, and a vertical skirt portion 23c as shown in FIG. 2 to prevent coolant from entering the headstock 7 (claim third cover). However, it is provided so as to cover the headstock 7. The back wall surface portion 23a is fixed to the support column 18 and faces the telescopic cover 16 side of the headstock 7 through a gap that does not come into contact with the telescopic cover 16. Further, the inner wall portion 23b is fixed so as to extend at a right angle to the back wall surface portion 23a and covers the inner side surface of the headstock 7 on the work W side. As shown in FIG. 2, the spindle chuck protrudes from the inner wall portion 23b. Further, a pleated skirt portion 23c made of an elastic body such as rubber is attached below the inner wall portion 23b so as to close the gap with the bed 2. The upper part between the back wall portion 23a and the telescopic cover 16 is closed by the outer cover 3. Further, the outer cover 3 is formed so as to close the upper ends of the inner wall portion 23b and the back wall portion 23a, and close the front and outer surfaces of the headstock 7.

【0034】

On the other hand, in order to prevent coolant from entering the tailstock 8, the tailstock cover including the vertical back wall portion 24a, the vertical inner wall portion 23b, and the skirt portion 24c as shown in FIG. A cover) is provided so as to cover the tailstock 8. The back wall surface portion 24a is fixed to the support column 18 and faces the tailstock 8 through a gap that does not come into contact with the bellows cover 17 side. Further, the inner wall portion 24b is fixed so as to move integrally with the tailstock 8 so as to extend at a right angle to the back wall surface portion 24a, and covers the inner surface of the tailstock 8 on the work W side. The ram of the tailstock 8 penetrates from this inner wall portion 24b. Further, a pleated skirt portion 24c made of an elastic body such as rubber is attached below the inner wall portion 24b so as to close the gap with the bed 2. Since the inner wall portion 24b moves in the C-axis direction together with the tailstock 8 according to the length of the work W, it moves relative to the back wall portion 24a. The outer peripheral part of the inner wall part 24b is wide in the C-axis direction, and the amount of wrap with the back wall part 24a is increased to prevent the coolant from entering the tailstock 8 side through the gap with the back wall part 24a. .. Further, the upper part between the back wall portion 24a and the bellows cover 17 is closed by the outer cover 4. Further, the outer cover 4 is formed so as to close the upper ends of the inner wall portion 24b and the back wall portion 24a, and close the front and outer surfaces of the tailstock 8.

【0035】

As shown in FIG. 1, the sliding door 5 has a configuration having two surfaces for closing the front portion and the upper portion on the opposite side of the grindstone G in the processing area defined between the inner wall portions 23b and 24b. It has become. The upper end edge of the sliding door 5 on the grindstone stand 11 side is partially wrapped with the top plate portion of the outer cover 3 in the closed state to prevent the coolant from scattering from above to the outside of the machine.

【0036】

Further, as shown in FIG. 5, in front of the grindstone stand 11, a grindstone stand front cover 25 that expands and contracts according to its advancement and retreat is provided so as to enter the groove 13. The front cover 25 prevents coolant and chips from entering the slide portion between the grindstone base 11 and the intermediate base 10.

【0037】

As shown in FIG. 8, the above-mentioned visible cover 6 is formed by integrally connecting the left side portion 6a covering the rear left side surface of the grindstone stand 11 and the right side portion 6b covering the rear right side portion with a connecting bar 6c. The left side portion 6a and the right side portion 6b are each provided with a double door DR that allows an operator to enter the rear space on the bed 2 for maintenance and inspection of equipment.

【0038】

In the grinding machine 1 configured as described above, when the intermediate base 10 slides, the telescopic cover 16 and the bellows cover 17 expand and contract the cover area to prevent the coolant from being scattered to the rear space on the bed 2. To do. Headstock covers 23a and 23b prevent coolant from splashing onto headstock 7. The tailstock covers 24a and 24b prevent the coolant from splashing onto the tailstock 8. When the sliding door 5 is closed, the coolant is prevented from scattering from the front portion and the upper surface portion of the grindstone base 11.

【0039】

That is, the inner wall portions 23b, 24b and the sliding door 5 of the headstock cover 23 and the tailstock cover 24 define the processing region 26 in front of the grindstone G. Then, when the grindstone stand 11 moves to the right, a part of the telescopic cover 16 defines a part of the machining area, and conversely, when the grindstone stand 11 moves to the left, the bellows cover 17 defines a part of the machining area. The coolant supplied to the grinding point and scattered is confined in this processing area 26, and limits the area where the coolant is scattered outside this area.

【0040】

The outer covers 3 and 4 cooperate with the telescopic cover 16, the frame member 15, and the upper ends of the bellows cover 17 to prevent the coolant from jumping over them and entering the rear space on the bed 2. This prevents the coolant from pouring onto the V-shaped guide surface 31 and the flat guide surface 32 for the intermediate base 10 arranged in the rear space of the bed 2. In addition, the outer covers 3 and 4 cooperate with the upper end of the headstock cover 23 and the upper end of the tailstock cover 24, and the coolant is applied to the headstock 7 and the tailstock 8 over the covers 23 and 24. Prevent it from pouring down. This prevents the headstock 7 and the tailstock 8 from being contaminated by the coolant.

【0041】

Further, the outer covers 3 and 4 cooperate with the upper surface portion of the slide door 5, and the coolant and coolant mist are above the processing area 26, above the opposite portion between the telescopic cover 16 and the headstock cover 23, and the bellows cover 17 and the center. Prevents coolant or mist from being dissipated to the outside of the machine from above the facing portion of the pusher cover 24. Therefore, the coolant supplied to the grinding point and the chips due to machining are scattered only within this defined machining area 26. Then, the scattered coolant is dropped into the groove 13 located directly below the processing region 26, and is collected in the gutter 14 on the left side of the machine through the groove 13.

【0042】

When the position of the tailstock 8 is adjusted according to the change in the type of the work W, the inner wall portion 24b of the tailstock cover 24 is integrally adjusted with the tailstock 8. In this case, since the outer peripheral edge of the inner wall portion 24b is widened and wraps around the back wall portion 24a, the coolant almost always invades the tailstock 8 side from the joint of both wall portions 24a and 24b. Absent.

【0043】

Both side surfaces of the rear portion of the grindstone stand 11 are closed by the left side portion 6a and the right side portion 6b of the visible cover 6 to prevent the operator from inadvertently entering the rear space. Since the visible cover 6 is composed of, for example, a wire mesh or the like so that the inside of the rear space can be visually recognized from the outside of the machine, it is possible to easily detect the occurrence of an abnormality in various devices arranged in the rear space. At that time, the operator can open the door of either the left side portion 6a or the right side portion 6b to enter the rear space and inspect the abnormal equipment. A control panel and a pump unit (not shown) are arranged at the rear of the machine to prevent workers from entering.

【0044】

Instead of the telescopic cover 16 and the bellows cover 17 shown in the present embodiment, a retractable cover or a band-shaped body that moves in and out of the front side and the side surface of the machine according to the movement of the intermediate base 10 may be used. Good.

【0045】

[Effect of the invention]

As described in detail above, according to the invention of claim 1, the first and second covers have a variable cover area and stand vertically in the traverse direction of the intermediate base on which the grinder is mounted on both side surfaces. The upper space of the bed was divided into a front space and a rear space by these first and second covers and a grindstone stand, so that the coolant is scattered on the guide surface of the intermediate base in the rear space. This can be prevented, and various devices arranged in the rear space can be prevented from being contaminated by the scattering of coolant.

【0046】

Preferably, as in the invention of claim 2, a frame member through which the grindstone stand moves forward and backward is provided in the intermediate base, and the inner end portions of the first and second covers are provided on the strut portions on both sides of the frame member. Since they are connected, the cover area can be changed in conjunction with the traverse motion of the intermediate base for the first cover and the second cover. In addition, a seal member that covers the gap between the inside of the frame member and the outside of the grindstone stand can be attached to the frame member as needed, and the front space and the rear space on the bed can be more reliably separated. Can be done.

【0047】

As in the invention of claim 3, a third cover that covers two surfaces of the first work support device facing the grinding point and a fourth cover that covers two surfaces of the second work support device that also faces the grinding point. And a movable fifth cover that selectively closes and opens the upper part of the processing area and the front part facing the grindstone stand, which are partitioned between the inner wall portions of the third and fourth covers facing each other. As a result, it is possible to prevent the coolant from scattering to the first and second work support devices. In particular, by providing the back wall portions of the third and fourth covers in close proximity to the first and second covers, respectively, the coolant scattering region can be substantially confined in the machining region and faces this machining region. Contamination by coolant in each part of the machine other than the above can be minimized.

【0048】

As in the invention of claim 4, the sixth cover fixed to the bed closes the space above the space defined by the first to fifth covers, so that the coolant mist is particularly scattered to the outside of the machine. It is possible to prevent scattering of the first and second work support devices to the upper surface and further prevention of coolant mist from entering the space behind the bed.

【0049】

Further, as in the invention of claim 5, the back wall portion fixed to the bed and the inner wall attached to the second work support device are provided with the fourth cover covering the two surfaces of the second work support device facing the grinding point. By separating it from the portion, it is not necessary to separately adjust the position of the fourth cover when adjusting the position of the second work support device.

【0050】

Further, as in the invention of claim 6, the side surface of the bed occupying the rear space of the bed is closed with a visible cover that makes the inside visible from the outside, so that the bed is arranged in the rear space of the bed. It is possible to easily visually check the abnormality of the equipment from the outside of the machine.

[Simple explanation of drawings]

[Figure 1]

The external perspective view of the grinding machine provided with the cover device according to the present invention as viewed from the front right side.

[Figure 2]

A perspective view of the grinding machine viewed from the front right side with the outer cover shown by the alternate long and short dash line removed.

[Fig. 3]

The explanatory view for demonstrating the arrangement relation of the main cover when the grinding machine is viewed in a plane with the outer cover peeled off.

[Fig. 4]

Explanatory drawing which shows the schematic structure of the grindstone stand front part of the grinding machine.

[Fig. 5]

A perspective view of the grinding machine viewed from the front right side with the outer cover, headstock, tailstock, and table on which they are mounted removed.

[Fig. 6]

AA cross-sectional arrow view of FIG.

[Fig. 7]

The perspective view of the cover arranged on both sides of the rear part of the grinding machine.

[Explanation of symbols]

1 ... grinding machine, 2 ... bed, 7 ... headstock, 8 ... tailstock, 10 ... intermediate base, G ... grindstone, 11 ... grindstone, 16 ... Telescopic cover (1st cover), 17 ... Bellows cover (2nd cover), 12 ... Grindstone guard, 15 ... Frame member, 23 ... Headstock cover (3rd cover), 24 ... Pushing platform cover (4th cover), 5 ... Sliding door (5th cover), 3,4 ... Outer cover (6th cover), 26 ... Machining area, 6.. .Visible cover