JP2015155131A - Spring grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring grinding machine which can suppress a storage number of rotating tables.

SOLUTION: This spring grinding machine 10 rotates a rotating table 54 in a state that coil springs 90 are accommodated in accommodation holes 54A which penetrate an external edge part of the rotating table 54, and are aligned in an annular shape, makes the coil spring 90 sequentially pass between end faces 21A, 21B of a pair of rotating grindstones 20A, 20B which oppose each other with a part of the external edge part of the rotating table 54 sandwiched therebetween, and grinds both end faces of the coil springs 90. The spring grinding machine 10 comprises an inter-axis distance adjusting mechanism which can arbitrarily adjust inter-axis distance L1 between a rotating shaft J3 of the rotating table 54 and rotating shafts J1, J2 of the rotating grindstones 20A, 20B. Since the inter-axis distance L1 can be adjusted, a rotating table which is currently possessed by a user becomes usable, and when introducing this spring grinding machine 10, it is not necessary to introduce a new rotating table.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a spring grinding apparatus for grinding both end faces of a coil spring.

  As a conventional spring grinding apparatus of this type, a rotary table is rotated in a state where a coil spring is accommodated in a plurality of spring accommodation holes arranged in a ring on the outer edge of the rotary table, and a part of the outer edge of the rotary table is obtained. There is known one that performs grinding with a pair of rotating grindstones facing each other (see, for example, Patent Document 1).

JP 09-295256 A (FIG. 2, paragraph [0005])

  By the way, although the above-mentioned conventional spring grinding apparatus is manufactured by a plurality of manufacturers, the inter-axis distance between the rotary shaft of the rotary table and the rotary shaft of the rotary grindstone differs among the manufacturers, and the inter-axis distance. Accordingly, the outer diameter of the rotary table was different (see FIG. 4). Therefore, a user who owns a plurality of manufacturers' spring grinding apparatuses needs to have a plurality of rotary tables for each manufacturer. On the other hand, there were requests from users to reduce the number of rotating tables.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a spring grinding apparatus capable of suppressing the number of rotary tables.

  In order to achieve the above object, a spring grinding apparatus according to the first aspect of the present invention provides a rotary table in a state in which a coil spring is accommodated in a plurality of spring accommodating holes that penetrate the outer edge of the rotary table and are arranged in an annular shape. In a spring grinding apparatus that rotates and sequentially passes coil springs between the end faces of a pair of rotating grindstones facing each other across a part of the outer edge of the rotary table, and grinds both end faces of the coil springs. It is characterized in that an inter-shaft distance adjusting mechanism capable of arbitrarily adjusting the inter-axis distance between the rotary shaft of the rotary table and the rotary shaft of the rotary grindstone is provided.

  According to a second aspect of the present invention, there is provided the spring grinding apparatus according to the first aspect, comprising: a fixed base that rotatably supports the pair of rotating grindstones; and a movable base that rotatably supports the rotary table; The adjustment mechanism includes a first guide that guides the movable base in a first horizontal direction approaching and moving away from the rotating grindstone so that the movable base can reciprocate with respect to the fixed base, and a movable base that is fixed at an arbitrary position in the first horizontal direction. It has the characteristic in the place provided with the 1st positioning part positioned with respect to it.

  The invention according to claim 3 is the spring grinding apparatus according to claim 2, wherein the fixed base is provided with a fixed sliding contact portion having a horizontal upper surface on which the movable base is slidably mounted. Have

  According to a fourth aspect of the present invention, in the spring grinding apparatus according to the third aspect, the movable protrusion that protrudes from the sliding contact surface that is in sliding contact with the upper surface of the fixed sliding contact portion of the movable base and the upper surface of the fixed sliding contact portion are opened. Thus, it has a feature in that the first guide is provided with a guide groove that receives the moving projection so as to be reciprocable in the first horizontal direction and prohibits movement in a direction perpendicular to the first horizontal direction.

  According to a fifth aspect of the present invention, in the spring grinding apparatus according to the third or fourth aspect, the fixed sliding contact portion includes a plurality of pin mounting portions formed side by side in the first direction, and the plurality of pin mounting portions. It has the characteristic in having provided the positioning pin which is attached to arbitrary pin attachment parts among these, and a movable base contact | abuts from a side as a 1st positioning part.

  According to a sixth aspect of the present invention, in the spring grinding apparatus according to the third or fourth aspect, the first positioning portion is formed by being vertically drilled with respect to the fixed sliding contact portion and the movable base and arranged side by side in the first horizontal direction. The plurality of positioning holes and a positioning pin that fits into an arbitrary positioning hole among the plurality of positioning holes are characterized.

  According to a seventh aspect of the present invention, in the spring grinding apparatus according to any one of the second to sixth aspects, the inter-axis distance adjusting mechanism includes an operation handle that is rotatable with respect to the fixed base and a rotation with respect to the operation handle. It is characterized in that it is provided with a power conversion imparting mechanism that transforms the operating force into a first horizontal driving force and imparts it to the movable base.

[Invention of Claim 1]
According to the spring grinding apparatus of the first aspect, since the inter-axis distance between the rotary shaft of the rotary table and the rotary shaft of the rotary grindstone can be arbitrarily adjusted, the rotary table already owned by the user is used. It becomes possible to do. That is, the user of the spring grinding apparatus does not need to introduce a new rotating table when introducing the spring grinding apparatus of the present invention, so that the number of rotating tables held can be suppressed.

[Invention of claim 2]
According to the second aspect of the present invention, a fixed base that rotatably supports a pair of rotating grindstones and a movable base that rotatably supports a rotating table are provided, and approach or leave the rotating grindstone by the guide of the first guide. By reciprocating the movable base in the first horizontal direction, the distance between the axes can be arbitrarily adjusted, and the movable base is positioned with respect to the fixed base by the first positioning portion at an arbitrary position in the first horizontal direction. By doing so, the distance between the axes can be kept constant.

[Invention of claim 3]
According to the invention of claim 3, the movable base can be moved horizontally on the fixed sliding contact portion, and the rotating shaft of the rotating table and the rotating shaft of the rotating grindstone can be kept in parallel with each other.

[Invention of claim 4]
According to the fourth aspect of the present invention, the horizontal projection orthogonal to the first horizontal direction is formed by the concave-convex engagement between the moving projection protruding from the sliding contact surface of the movable base and the guide groove opening opened on the upper surface of the fixed sliding contact portion. Movement of the movable base in the direction can be prohibited.

[Invention of claim 5]
According to the invention of claim 5, a positioning pin as a first positioning portion is attached to an arbitrary pin mounting portion among a plurality of pin mounting portions provided in the fixed sliding contact portion, and the positioning pin is movable from the side. By bringing the base into contact, the movable base can be positioned at a plurality of positions in the first horizontal direction.

[Invention of claim 6]
According to the invention of claim 6, the movable base is moved to the first horizontal position by fitting the positioning pin into an arbitrary positioning hole among the plurality of positioning holes drilled in the vertical direction with respect to the fixed base and the movable base. It can be positioned at multiple positions in the direction.

[Invention of Claim 7]
According to the seventh aspect of the present invention, the movable base can be slid in the first horizontal direction with respect to the fixed base by rotating the operation handle, and the movable base can be easily moved.

1 is a side sectional view of a spring grinding apparatus according to an embodiment of the present invention. Side sectional view of the spring holding and moving mechanism Front sectional view of spring holding and moving mechanism Plan view showing the relationship between the distance between the shafts and the outer diameter of the rotary table (A) Plan view of horizontal plate, (B) Plan view of top plate Sectional drawing in the KK cut surface of FIG. Side sectional view of the spring holding and moving mechanism Side sectional view of horizontal plate and top plate according to modification

  Hereinafter, a spring grinding apparatus 10 according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the spring grinding apparatus 10 of the present embodiment has a pair of vertical movement bases 12A and 12B arranged vertically on a frame 11 (corresponding to a “fixed base” of the present invention) installed on a floor. I have.

  The upper vertical movement base 12 </ b> A includes a cylindrical body 15 </ b> A extending in the vertical direction, and the cylindrical body 15 </ b> A can move directly in the vertical direction inside a cylindrical guide sleeve 16 </ b> A provided on the frame 11. Yes. A screw jack 13A having a trapezoidal screw shaft is provided between the frame 11 and the vertical movement base 12A. The screw jack 13A is operated by operating a handwheel handle (not shown) to move the vertical movement base 12A to an arbitrary vertical position. Can be positioned.

  Similarly, the lower vertical movement base 12 </ b> B includes a cylindrical body 15 </ b> B extending in the vertical direction, and the cylindrical body 15 </ b> B moves linearly in the vertical direction inside a cylindrical guide sleeve 16 </ b> B provided in the frame 11. It is possible. A screw jack 13B having a trapezoidal screw shaft is provided between the frame 11 and the vertical movement base 12B. The screw jack 13B is operated by operating a handwheel handle (not shown), and the vertical movement base 12B is moved up and down arbitrarily. Can be positioned.

  A drive shaft 17B is rotatably supported inside a cylindrical body 15B provided in the lower vertical movement base 12B. And the rotating grindstone 20B is fixed to the upper end part of the drive shaft 17B so that integral rotation is possible, and the output rotating shaft of the grindstone drive motor 18B is connected to the lower end part of the drive shaft 17B. Similarly, a drive shaft 17A is rotatably supported inside a cylindrical body 15A provided on the upper vertical movement base 12A, and a rotating grindstone 20A can rotate integrally with a lower end portion of the drive shaft 17A. The output rotation shaft of the grindstone drive motor 18A is connected to the upper end of the drive shaft 17A. These rotary grindstones 20A and 20B are both disk-shaped and have the same outer diameter. In addition, the end faces 21A and 21B facing each other of the rotating grindstones 20A and 20B are both flat surfaces orthogonal to the rotation axes J1 and J2 of the rotating grindstones 20A and 20B. In addition, the rotating shafts J1 and J2 of the rotating grindstones 20A and 20B are arranged on the same axis.

  As shown in FIG. 1, the frame 11 includes a support base 40 that protrudes forward, and a spring holding and moving mechanism 50 (corresponding to the “movable base” of the present invention) is attached to the support base 40. ing. As shown in FIG. 3, the support base 40 includes a pair of side panels 41 and 41 arranged so as to face each other in the horizontal direction Y, and a mounting top plate 42 supported by the side panels 41 and 41. And a space 46 is formed below the mounting table 42.

  The spring holding and moving mechanism 50 includes a cylindrical main body 51 extending in the vertical direction, and a table drive shaft 53 is rotatably supported in the main body 51. A rotary table 54 is attached to the upper end portion of the table drive shaft 53 so as to be integrally rotatable. A table drive motor 56 is attached to the lower end portion of the table drive shaft 53 via a speed reducer 57 (for example, a worm speed reducer). It is connected. Here, the rotary table 54 can be attached to and detached from the table drive shaft 53.

  Hereinafter, the arrangement direction (left and right direction in FIG. 1) of the rotation axes J1 and J2 of the rotary grindstones 20A and 20B and the rotation axis J3 of the rotary table 54 is referred to as “first horizontal direction X”. A horizontal direction Y orthogonal to (the direction orthogonal to the paper surface of FIG. 1) is referred to as “second horizontal direction Y”.

  A bracket 58 protruding in the second horizontal direction Y is attached to the lower end portion of the main body 51, and a table drive motor 56 is attached to the bracket 58. The table drive motor 56 is mounted with its output rotation shaft 56J parallel to the second horizontal direction Y, and passes through an opening 41A formed in one side panel 41 and is placed outside the support base 40. It protrudes. The speed reducer 57 is attached to the lower surface of the bracket 58, the output shaft of the speed reducer 57 is connected to the lower end of the table drive shaft 53, and the input shaft 57J is connected to the output rotation shaft 56J of the table drive motor 56. It is connected.

  The rotation direction of the rotary table 54 is counterclockwise when viewed from above (see arrow A in FIG. 4). Further, the rotational directions of the rotating grindstones 20A and 20B are both counterclockwise as viewed from above.

  As shown in FIG. 4, a plurality of spring accommodating holes 54 </ b> A penetrating in the vertical direction are provided on the outer edge portion of the rotary table 54. The spring accommodating holes 54A are circular, and their center points are arranged at equal intervals on an imaginary circle centered on the rotation axis J3 of the rotary table 54, and adjacent spring accommodating holes 54A, 54A are adjacent to each other. doing. Then, the compression coil spring is accommodated in the spring accommodating hole 54A as a workpiece 90 (see FIG. 2) which is a grinding object of the spring grinding apparatus 10. In FIG. 2, only one of the plurality of workpieces 90 is shown. Further, since the configuration of the rotary table 54 is known (see, for example, Japanese Patent Application Laid-Open No. 2007-307668, Japanese Patent Application Laid-Open No. 2007-175806, and Japanese Patent Application Laid-Open No. 9-201752), detailed description thereof is omitted.

  As shown in FIG. 2, an upper end plate 59 projects from the upper end portion of the main body 51. The upper end plate 59 is arranged with a gap between the upper end plate 59 and the lower surface of the rotary table 54, and a spring lower end support plate 60 is fixedly provided on the upper surface of the upper end plate 59. The spring lower end support plate 60 has a flat plate shape, and the upper surface of the spring lower end support plate 60 and the end surface 21B of the lower rotating grindstone 20B are flush with each other. Further, in order to avoid interference with the lower rotating grindstone 20B, the spring lower end support plate 60 is concentric with the rotating grindstone 20B and has an arc-shaped notch (not shown) having a slightly larger diameter than the rotating grindstone 20B. Is provided. When the rotary table 54 rotates, the lower end portion of the group of workpieces 90 accommodated in the spring accommodation hole 54A is in sliding contact with the upper surface of the spring lower end support plate 60, and between the spring lower end support plate 60 and the rotating grindstone 20B. The workpiece 90 is smoothly transferred.

  In addition, a discharge port (not shown) is formed at a position in the spring lower end support plate 60 that passes through a position P2 (see FIG. 4) where the spring accommodating hole 54A is retracted from the inter-grinding wheel region R1 (see FIG. 1). The workpiece 90 that has passed between the pair of rotating grindstones 20A and 20B while being accommodated in the spring accommodation hole 54A is discharged downward from the discharge port. The spring lower end support plate 60 can be inserted into and removed from the horizontal direction in the gap between the rotary table 54 and the upper end plate 59 and is detachably attached to the upper end plate 59.

  By the way, as can be seen from the comparison between FIG. 2 and FIG. 7, the spring grinding apparatus 10 of the present embodiment is an axis between the rotation axis J3 of the rotary table 54 and the rotation axes J1 and J2 of the rotary grindstones 20A and 20B. The distance L1 (see FIG. 4) can be adjusted, and for this purpose, the following “inter-axis distance adjustment mechanism” is provided.

  As shown in FIG. 2, a guide groove hole 42 </ b> M is formed through the mounting table 42. The guide groove 42M extends in the first horizontal direction X penetrating the mounting top plate 42 in the vertical direction and coming into contact with and away from the rotation axes J1 and J2 of the rotating grindstones 20A and 20B (FIG. 5). (See (B)).

  As shown in FIG. 3, the main body 51 of the spring holding and moving mechanism 50 vertically penetrates the guide groove hole 42 </ b> M, and a horizontal plate 52 that protrudes horizontally from a position near the lower end of the main body 51 is mounted. It is placed on the horizontal upper surface of the top plate 42. Further, both inner side surfaces in the second horizontal direction Y of the guide groove hole 42M are in contact with the outer side surface of the main body 51, and movement of the main body 51 in the first horizontal direction X is allowed, while The movement of the main body 51 in the horizontal direction other than the horizontal direction X is restricted. Further, since the horizontal plate 52 of the main body 51 can be moved horizontally on the top surface of the mounting top plate 42, the rotation axis J3 of the rotary table 54 and the rotation axes J2 and J3 of the rotary grindstones 20A and 20B are parallel to each other. Can be kept in a state. The support base 40 (more precisely, the mounting top plate 42) corresponds to the “fixed sliding contact portion” of the present invention, and the lower surface of the horizontal plate 52 corresponds to the “sliding contact surface” of the present invention. The guide groove 42M corresponds to the “first guide” of the present invention.

  The reduction gear 57 of the spring holding and moving mechanism 50 is disposed in the space 46 inside the support base 40, and a part of the table drive motor 56 is an opening 41A formed in the side panel 41 as described above. Projecting from the support base 40 to the outside. In order to correspond to the movement of the main body 51 in the first horizontal direction X, the opening 41A has a horizontally long shape extending in the first horizontal direction X (see FIG. 2).

  A first vertical wall 43 stands up from the position near the rotary grindstones 20A and 20B in the first horizontal direction X of the mounting table 42. The first vertical wall 43 is a stopper that abuts against the side surface of the main body 51 and prohibits further movement when the spring holding and moving mechanism 50 is moved in a direction to reduce the inter-axis distance L1. And the rotating grindstone 20B are prevented from interfering with each other.

  A second vertical wall 44 is provided at a position on the opposite side of the mounting top plate 42 from the first vertical wall 43 with the spring holding and moving mechanism 50 interposed therebetween. The second vertical wall 44 protrudes from the upper surface of the mounting top plate 42, and the operation handle 45 is rotatably supported by the second vertical wall 44. The operation handle 45 includes a screw shaft 45J extending in parallel with the first horizontal direction X, and the screw shaft 45J is screwed into a nut 55 fixed to the front end portion of the horizontal plate 52 so that a “ball screw mechanism” is formed. It is configured. In other words, the rotational operating force of the operating handle 45 is converted into a propulsive force in the first horizontal direction X by a ball screw mechanism (corresponding to the “power conversion applying mechanism” of the present invention) and applied to the spring holding and moving mechanism 50. Is done. Thereby, the moving operation of the spring holding and moving mechanism 50 can be easily performed.

  As shown in FIG. 5 (B), the mounting top plate 42 is formed with a plurality of fitting holes 42A (corresponding to “positioning holes” of the present invention) penetrating the mounting top plate 42 in the vertical direction. ing. Specifically, a plurality of (for example, three or more in this embodiment) fitting holes 42A are arranged at predetermined intervals along the first horizontal direction X, and each fitting hole 42A is a second one. Pairs are made in the horizontal direction Y. In other words, two fitting holes 42A and 42A arranged in the second horizontal direction Y are set as one set, and a plurality of sets (for example, three or more sets in this embodiment) of the fitting holes 42A and 42A are provided in the first horizontal direction X. Are arranged at predetermined intervals.

  Similarly, a plurality of fitting holes 52 </ b> A (corresponding to “positioning holes” of the present invention) penetrating the horizontal plate 52 in the vertical direction are also formed in the horizontal plate 52. Specifically, as shown in FIG. 5A, a plurality of (for example, three in this embodiment) fitting holes 52A are arranged at predetermined intervals along the first horizontal direction X. Each fitting hole 52A makes a pair in the second horizontal direction Y. In other words, two fitting holes 52A and 52A arranged in the second horizontal direction Y are set as one set, and a plurality of sets (for example, three sets in this embodiment) of the fitting holes 52A and 52A are arranged in the first horizontal direction X. Are arranged at predetermined intervals along.

  As shown in FIG. 6, the spring holding and moving mechanism 50 has the fitting holes 42 </ b> A and 52 </ b> A aligned in the vertical direction in at least one place in the first horizontal direction X and the aligned fitting. Positioning pins 61 are fitted into the holes 42A and 52A. The fitting holes 42A, 52A and the positioning pin 61 correspond to the “first positioning portion” in the present invention, and the spring holding and moving mechanism 50 is positioned with respect to the support base 40 by the fitting. Further, the horizontal plate 52 and the mounting top plate 42 are fixed by fastening parts such as bolts (not shown) in a state where the positioning by the positioning pins 61 is performed.

  Here, although not shown, both the horizontal plate 52 and the mounting top plate 42 are provided with alignment marks. When these marks are matched, the fitting holes 42A and 52A are aligned with each other, A predetermined inter-axis distance L1 is set. In the present embodiment, the positioning pins 61 are fitted in all of the plurality of fitting holes 42A and 52A aligned with each other (see FIG. 6), but the spring holding and moving mechanism 50 is not in the first horizontal direction X. Since movement in the horizontal direction is restricted, if the positioning pin 61 is fitted in at least one of the plurality of fitting holes 42A and 52A aligned with each other, the spring holding and moving mechanism 50 is moved in the first horizontal direction. It is possible to position with X.

  The above is the description of the configuration of the present embodiment. Next, the effect of this embodiment is demonstrated. As described above, in the conventional spring grinding apparatus, the inter-axis distance L1 is different for each manufacturer. Therefore, when a user who owns a conventional spring grinding apparatus introduces the spring grinding apparatus 10 of the present embodiment, the inter-axis distance L1 of the currently owned spring grinding apparatus is examined, and the inter-axis distance L1 and The position of the spring holding and moving mechanism 50 of the spring grinding apparatus 10 of this embodiment is adjusted so as to be the same.

  Specifically, the operating handle 45 is rotated to slide the spring holding and moving mechanism 50 in the first horizontal direction X on the support base 40, so that the mark attached to the mounting table 42 and the horizontal plate 52 are attached. The target mark is made to coincide with the target mark L1. Then, since the plurality of fitting holes 52A formed in the horizontal plate 52 and the plurality of fitting holes 42A formed in the mounting top plate 42 are aligned, the positioning pins are inserted into the aligned fitting holes 42A and 52A. 61 is fitted, and the spring holding and moving mechanism 50 is positioned and fixed with respect to the support base 40. Thereby, the center distance L1 of the spring grinding apparatus 10 is determined. When the inter-axis distance L1 is determined, the rotary table 54 owned by the user is fixed to the upper end of the table drive shaft 53.

  Note that the spring lower end support plate 60 may be attached in advance so as to be able to handle all of the assumed rotary tables 54, or depending on the inter-axis distance L1 (outer diameter of the rotary table 54). A plurality of types of boards 60 may be prepared, and the spring lower end support board 60 may be replaced as necessary when adjusting the inter-axis distance L1.

  Thus, according to the spring grinding apparatus 10 of the present embodiment, the inter-axis distance L1 between the rotary shaft J3 of the rotary table 54 and the rotary shafts J1 and J2 of the rotary grindstones 20A and 20B can be arbitrarily adjusted. Therefore, it becomes possible to use the rotary table 54 already owned by the user. That is, when the user of the spring grinding apparatus introduces the spring grinding apparatus 10 of the present embodiment, it is not necessary to introduce a new rotating table 54, so that the number of rotating tables 54 held can be suppressed. In addition, when the spring grinding apparatus 10 of the present embodiment is replaced with a spring grinding apparatus that is currently held, the rotary table 54 that is already held can be used as it is.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) In the above embodiment, the positioning pin 61 is fitted into the fitting hole 52A penetrating the horizontal plate 52 of the spring holding and moving mechanism 50 and the fitting hole 42A formed in the mounting top plate 42 of the support base 40. As a result, the spring holding and moving mechanism 50 is positioned in the first horizontal direction X with respect to the support base 40. For example, as shown in FIG. 8, the spring holding and moving mechanism 50 is fitted into the fitting hole 42A of the mounting top plate 42. The spring holding and moving mechanism 50 may be positioned with respect to the support base 40 by the horizontal plate 52 coming into contact with the combined positioning pin 61 from the side (first horizontal direction X). . The fitting hole 42 </ b> A at this time corresponds to a “pin mounting portion” of the present invention, and the positioning pin 61 corresponds to a “first positioning portion”.

  (2) In the above-described embodiment, the spring holding and moving mechanism 50 can be positioned at a plurality of positions in the first horizontal direction X by the positioning pins 61, but by frictional engagement between the horizontal plate 52 and the mounting top plate 42. If the movement of the spring holding and moving mechanism 50 can be prevented, positioning means such as the positioning pins 61 may not be provided and finer position adjustment may be performed.

  (3) In the above embodiment, the three or more fitting holes 42A and 52A arranged along the first horizontal direction X are provided in pairs in the second horizontal direction Y. A plurality of fitting holes 42A and 52A may be provided only on one side in the horizontal direction Y.

  (4) A plurality of pairs of fitting holes 42A, 42A paired in the second horizontal direction Y are formed in the mounting top plate 42, and the plurality of pairs of fitting holes 42A, 42A are formed in the first horizontal direction. A pair of fitting holes 52A and 52A that are arranged at predetermined intervals along X and are paired in the second horizontal direction Y are formed in the horizontal plate 52, and are fitted into the pair of fitting holes 52A and 52A. The spring holding and moving mechanism 50 can be positioned at a plurality of positions in the first horizontal direction X by fitting the combined positioning pins 61 and 61 into any one of a plurality of pairs of fitting holes 42A and 42A. It is good also as a simple structure.

  (5) In the above embodiment, the ball screw mechanism is provided as the “power conversion imparting mechanism” of the present invention. However, the present invention is not limited to this, and the power conversion imparting mechanism is, for example, a crank slider mechanism or a rack and pinion. It may be a mechanism. In addition, an electric actuator such as a motor, an air cylinder, or a hydraulic cylinder may be provided, and the spring holding and moving mechanism 50 may be moved horizontally by using them as a power source. Furthermore, the configuration may be such that the operation handle and the power conversion imparting mechanism are excluded.

  (6) In the above embodiment, the positioning pin 61 is fitted into the fitting holes 42A and 52A to position the spring holding and moving mechanism 50. However, either one or both of the fitting holes 42A and 52A are screwed. While changing to a hole, the positioning pin 61 may be changed to a bolt. Moreover, you may use together the positioning pin 61 and a volt | bolt.

  (7) In the above-described embodiment, the main body 51 provided in the spring holding and moving mechanism 50 passes through the guide groove hole 42M formed in the mounting top plate 42, and the horizontal plate 52 projects laterally from the main body 51. Is mounted on the top surface of the mounting table 42 so as to be slidable, but a reduction gear 57 provided at the lower end of the spring holding and moving mechanism 50 is mounted on the mounting table 42 so as to be slidable. Also good. In this case, a “moving protrusion” is protruded from the lower end surface of the speed reducer 57, a guide groove hole extending in the first horizontal direction is formed on the mounting top plate 42, and the moving protrusion is used as a guide groove hole. What is necessary is just to make it the structure accepted so that sliding was possible.

  (8) In the above embodiment, the screw jacks 13A and 13B for moving the vertical movement bases 12A and 12B up and down with respect to the frame 11 are configured to be operated by manual operation of a handwheel handle (not shown). A motor may be provided as a power source for the screw jacks 13A and 13B.

10 Spring grinding machine 11 Frame (fixed base)
20A, 20B Rotary grinding wheel 40 Support base (fixed sliding contact part)
42A Fitting hole (positioning hole)
42M guide slot (first guide)
45 Operation handle 50 Spring holding and moving mechanism (movable base)
51 Main body (moving protrusion)
52 Horizontal plate 52A Fitting hole (positioning hole)
54 Rotating table 54A Spring accommodating hole 61 Locating pin J1, J2 Rotating wheel rotating shaft J3 Rotating table rotating shaft L1 Center distance X First horizontal direction

Claims (7)

A pair of opposed rotating tables rotating the rotating table in a state in which the coil springs are housed in a plurality of spring housing holes that penetrate the outer edge of the rotating table and are arranged in an annular shape, and sandwich a part of the outer edge of the rotating table. In the spring grinding apparatus for sequentially passing the coil springs between the end faces of the rotating whetstone and grinding both end faces of the coil springs,
A spring grinding apparatus comprising an inter-axis distance adjusting mechanism capable of arbitrarily adjusting an inter-axis distance between a rotary shaft of the rotary table and a rotary shaft of the rotary grindstone. A fixed base that rotatably supports the pair of rotating grindstones;
A movable base that rotatably supports the rotary table;
The inter-axis distance adjusting mechanism includes a first guide that guides the movable base so as to reciprocate with respect to the fixed base in a first horizontal direction approaching and leaving the rotating grindstone.
The spring grinding apparatus according to claim 1, further comprising a first positioning portion that positions the movable base with respect to the fixed base at an arbitrary position in the first horizontal direction.   The spring grinding apparatus according to claim 2, wherein the fixed base includes a fixed sliding contact portion having a horizontal upper surface on which the movable base is slidably mounted. A moving protrusion that protrudes from a sliding contact surface that is in sliding contact with the upper surface of the fixed sliding contact portion of the movable base;
A guide groove that opens to the upper surface of the fixed sliding contact portion and receives the moving protrusion so as to be reciprocable in the first horizontal direction and prohibits movement in a direction perpendicular to the first horizontal direction; The spring grinding apparatus according to claim 3, wherein the spring grinding apparatus is provided as a first guide.   The fixed sliding contact portion is formed with a plurality of pin attachment portions formed side by side in the first direction, attached to an arbitrary pin attachment portion among the plurality of pin attachment portions, and the movable base from the side The spring grinding apparatus according to claim 3, wherein a positioning pin that abuts is provided as the first positioning portion.   The first positioning portion is vertically drilled with respect to the fixed sliding contact portion and the movable base, and a plurality of positioning holes formed side by side in the first horizontal direction, and among the plurality of positioning holes, The spring grinding apparatus according to claim 3 or 4, wherein the spring grinding apparatus comprises a positioning pin that fits in the arbitrary positioning hole.   The inter-axis distance adjusting mechanism includes an operation handle that is rotatable with respect to the fixed base, and a power that is applied to the movable base by converting a rotational operation force with respect to the operation handle into a propulsive force in the first horizontal direction. The spring grinding apparatus according to claim 2, further comprising a conversion imparting mechanism.

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