JP4258602B2 - Protective cover device for machine tools - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a protective cover device that prevents chips from entering a mechanical part or the like in a machine tool, and more particularly to a configuration of a device that prevents chips from collecting on the protective cover body.
[0002]
[Prior art]
Conventionally, one end of a flexible belt-like sheet cover is connected to a moving member of a machine tool, for example, a processing head or a workpiece mounting table, and the other end of the seat cover is a fixed member, for example, a machine tool body. In order to prevent chips from entering or accumulating in a portion of a transmission mechanism such as a rail portion and a feed screw which are slidably guided by the seat cover with the seat cover. In that case, a roller-shaped weight is placed on the folded portion of the seat cover, and the seat cover is stretched. In order to remove chips accumulated on the folded portion, a spiral groove or protrusion is provided on the circumferential surface of the roller-shaped weight, and a roller-like shape is formed at the folded portion as the moving member reciprocates. When the weight of the body rotates (rotates), the chips are discharged along one or both sides of the left and right side edges of the seat cover along the spiral groove or ridge (for example, Patent Literature 1).
[0003]
[Patent Document 1]
JP-A-8-168936 (pages 3-4, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, when the roller-shaped weight as in the prior art rotates, chips are sandwiched between the outer peripheral surface of the weight and the surface of the seat cover (the outer peripheral surface of the ridge). Therefore, there is a problem that even if there are the spiral grooves and ridges, it is difficult for the chips to move toward the end of the roller, and therefore the chip discharging action is not reliable.
[0005]
The present invention has been made to solve the above-mentioned conventional technical problems, and an object of the present invention is to provide a protective cover device in a machine tool that can easily remove chips.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a protective cover device for a machine tool according to claim 1 is a belt-shaped protective cover body having flexibility and disposed between a fixed member and a reciprocating moving member in the machine tool. A roller-shaped weight is rotatably disposed in the folded portion of the protective cover body, and a window hole for removing chips is formed in the region of the protective cover body through which the weight passes as the moving member reciprocates. The roller-shaped weight has a large diameter at both ends in the width direction of the protective cover body, and a small diameter at a portion where the weight passes through the window hole. Is.
[0007]
According to a second aspect of the present invention, in the protective cover device for a machine tool according to the first aspect, one or a plurality of the window holes are formed at portions excluding both ends in the width direction of the protective cover body. It is.
[0008]
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment embodying the present invention will be described. 1 is a side view of a protective cover device of a machine tool, FIG. 2 is a front view of a machining head in a lowered state, FIG. 3A is a partially cutaway front view of a first embodiment of a protective cover body and a weight, and FIG. 3 (b) is a partially cutaway front view of the second embodiment, and FIGS. 4 (a) to 4 (d) are views showing other embodiments of window holes in the protective cover body.
[0010]
A rail 3 that slidably supports a machining head 2 capable of reciprocating up and down is provided on the front surface of a vertically long column 1 as an example of a fixing member in the machine tool shown in FIG. The machining head 2 is configured to reciprocate up and down by a distance L1 in FIG. 1 by a ball screw shaft 4 and a transmission mechanism such as a lifting motor (not shown).
[0011]
In addition, a tool holder 6 for mounting a tool 5 such as a drill is provided at the lower end of the machining head 2, and the tool holder 6 and the tool 5 are driven to rotate by a drive motor and a main shaft (not shown) so that the lower work piece in FIG. In this configuration, the workpiece (workpiece) fixed on the table is subjected to cutting or the like.
[0012]
One end (upper end) of the flexible protective cover body 10 according to the present invention is connected to the lower surface of the processing head 2 as an example of a moving member via a bracket 11, a bolt 12 a, and the like. The other end of the cover body 10 is similarly connected to the lower part of the column 1 as the fixing member via a bracket, a bolt 12b and the like. The protective cover body 10 is made of a synthetic resin belt-shaped sheet 10a, and a protective reinforcing plate 13 made of a narrow aluminum plate or the like is formed one by one on the upper side of the surface of the sheet 10a by eyelets or the like. It is fixed. Thereby, it is the structure which can prevent damage, such as the stab which scatters when cutting the workpiece | work with the said tool 5 directly at the synthetic resin sheet | seat 10a (refer FIG.1, FIG.2 and FIG.3 (a)). ). In addition, the sheet 10a is formed so as to be bendable at portions adjacent to each other on the protection reinforcing plates 13 arranged in a plurality.
[0013]
In the illustrated embodiment, two substantially horizontal guide rollers 14 and 15 are rotatably disposed at left and right brackets 16 and 16 fixed to the column 1 at the lower end portion of the rail 3 on the front surface of the column 1. After the intermediate portion of the protective cover body 10 is stretched over the guide rollers 14 and 15, a folded portion 17 that opens upward is provided between the lower ends of the protective cover body 10, and the folded portion 17 has a roller shape. The weight 19 is placed (arranged) rotatably.
[0014]
A window hole 20 for removing chips is formed in the region of the protective cover body 10 through which the weight 19 passes as the machining head 2 moves up and down. Near the lower end of the protective cover 10 and on the lower surface side of the roller-shaped weight 19 in the upward open folded portion 17 when the processing head 2 is at the upper upper limit position (see the solid line state in FIG. 1). The window hole 20 is formed across the window hole 20 so that the window hole 20 is positioned on the lower surface side of the weight 19 of the folded portion 17 when the processing head 2 is slightly lowered from the upper limit position. The length dimension (L2) in the longitudinal direction of the sheet 10a of the 20 protective cover bodies 10 (the direction of movement of the folded portion 17 and the direction of arrow A) is longer than the circumferential length of the weight 19.
[0015]
In the first embodiment, as shown in FIGS. 2 and 3A, two window holes 20 are formed at appropriate intervals in the width direction (arrow B direction) of the protective cover body 10 in the sheet 10a. ing.
[0016]
As shown in FIG. 2, FIG. 3A and FIG. 3B, the weight 19 is a portion where each weight 19 and each of the window holes 20 and 20 overlap in the width direction of the sheet 10a (each window hole). The diameter of the portion where the weight 19 passes through 20 is formed to have a small diameter D1, while at least both ends in the width direction of the protective cover body 10 have a large diameter D2. In order to prevent the chips from being pressed by the weight 19 because the chips are positioned in a free state between the small diameter D1 and the sheet 10a that are not in contact with the large diameter D2 in contact with the sheet 10a in the folded portion 17. The size difference between the large diameter D2 and the small diameter D1 is preferably as large as possible.
[0017]
With the above configuration, when cutting the workpiece (not shown) while lowering the machining head 2, chips (not shown) are scattered around. Most of the chips scattered on the front side of the column 1 are bounced off the surface of the protective cover 10 and fall downward, so that the chips collide with the rail 3 and the ball screw shaft 4 in the column 1. Adhesion can be prevented by the protective cover body 10. Note that a protective plate 21 made of a metal plate is arranged vertically in front of the column 1 and in front of the portion where the folded portion 17 of the protective cover body 10 is located, so that the chips are on the surface of the sheet 10a. Protects against direct hit.
[0018]
Part of the scattered chips enters the back surface from the outer side in the width direction of the protective cover body 10 and enters the bag-like folded portion 17 opened upward. In FIG. 1, a two-dot chain line is a lowering lower limit position of the machining head 2 and indicates the positions of the corresponding folded portion 17 and the weight 19. When one step of the processing is completed and the processing head 2 is raised, the protective cover body 10 is pulled up and the folded portion 17 is also raised. The weight 19 rolls in the folded portion 17 as the folded portion 17 rises. When the weight 19 approaches the lower end portion (fixed position) of the protective cover body 10, the portion of the window hole 20 in the sheet 10 a passes through the lower surface side of the roller-shaped weight 19, and eventually the folded portion 17. The chips accumulated in the portion 17 are simply dropped and discharged downward through the window hole 20 that opens downward. In this way, the chips accumulated (accumulated) in the folded portion 17 can be automatically discharged as the machining head 2 moves up and down.
[0019]
Of the roller-shaped weight 19, the diameter of the portion overlapping the window hole 20 (the portion where the weight 19 passes through the window hole 20) is small, and the sheet 10a is always in contact and rolling. Since the diameter is large, a gap is formed between the lower surface side of the portion having a small diameter of the weight 19 and the inner surface side surface of the sheet 10a of the folded portion 17, and the accumulated chips are collected on the outer peripheral surface of the weight 19 ( The pressure on the sheet 10a at the circumferential surface) is alleviated, and when the weight 19 passes through the window hole 20, the chip can be easily dropped.
[0020]
FIG. 3B shows a second embodiment of the shape and arrangement of the window holes. In this embodiment, when the three window holes 20a, 20b, and 20c are drilled and formed in the sheet 10a independently, one window hole 20a formed at the center in the width direction of the sheet 10a, and the sheet 10a The two window holes 20b and 20c formed at the left and right side edge portions in the width direction are appropriately in the longitudinal direction of the sheet 10a (the direction in which the folded portion 17 moves, the direction of arrow A in FIG. 3B). They are spaced apart. Further, the left and right side edges of one window hole 20a formed in the central portion, and the center position in the width direction of the two window holes 20b and 20c formed at the left and right side edge portions of the sheet 10a in the width direction. The side edges of the sheet 10a coincide with each other in the width direction (arrow B direction) of the sheet 10a as a movement locus of the hole, or are partially overlapped by a dimension H1. By configuring in this way, the chips accumulated at the substantially central portion in the width direction of the sheet 10a are first discharged from the window hole 20a at the center position as the turn-up portion 17 rises, and then in the width direction of the sheet 10a. Chips collected near the left and right sides are discharged from the left and right window holes 20b and 20c. Therefore, the chips located in the range where the dimension H2 in the width direction of the sheet 10a is large can be sequentially discharged.
[0021]
4 (a) to 4 (d) show third to sixth embodiments relating to the shape and arrangement of the window holes, and the third and fourth embodiments of FIGS. 4 (a) and 4 (b). The window holes 20e and 20f are inclined with respect to the width direction (arrow B direction) of the sheet 10a and are formed independently of each other, and are part of the window holes 20e and 20f at a substantially central portion in the width direction. Are overlapping as the movement trajectory of the hole. In 5th Embodiment of FIG.4 (c), the one window hole 20g is formed in the inclined form leaving the left-right both-sides edge part of the width direction of the sheet | seat 10a. In the sixth embodiment shown in FIG. 4D, three mutually independent window holes 20h, 20i, 20j are appropriately separated in the longitudinal direction of the sheet 10a (the direction in which the folded portion 17 moves, the direction of arrow A). The edges of the window holes 20h, 20i, and 20j that are arranged and extend along the width edge of the sheet 10a overlap as the movement trajectory of the adjacent holes. In any of these embodiments, the chips can be discharged over a wide arrangement in the width direction of the sheet 10a. In particular, in the case where the window hole is formed in an inclined shape, the window hole shifts in the width direction of the sheet 10a on the lower surface side of the weight 19 as the folding part 17 moves, so that the chips in the long movement range of the folding part 17 The effect that can be discharged.
[0022]
FIG. 5 is applied to a case where a work mounting table (moving member) 27 reciprocates horizontally along a rail 26 on the upper surface of a horizontal table (fixing member) 25. The front end of the protective cover body 28 having flexibility is connected, the latter half of the protective cover body 28 is hung downward through a guide roller 29 provided at the end of the table 25, and the middle part is folded back upward. A roller-shaped weight 31 is rotatably mounted on the portion 30. As the window hole formed in the protective cover body 28, those in the first to sixth embodiments can be adopted as appropriate. Also in this embodiment, it is possible to prevent the chips from being deposited on the rail 26 and the like by the protective cover body 28, and the chips accumulated on the folded portion 30 can be easily removed from the window hole formed in the protective cover body 28. Can be discharged.
[0023]
【The invention's effect】
As described above, the protective cover device in the machine tool according to the first aspect of the present invention is a flexible belt-shaped protective cover body disposed between the fixed member and the reciprocating moving member in the machine tool. A roller-shaped weight is rotatably arranged in the folded portion of the cover, and a window hole for removing chips is formed in the area of the protective cover body through which the weight passes as the moving member reciprocates. It is characterized by this.
[0024]
With this configuration, as the moving member reciprocates, the upward open folded portion of the protective cover body moves relative to the roller-shaped weight, and the window hole formed in the protective cover body at that time Passes through the lower surface side of the weight, so that the chip accumulated in the folded portion can be easily discharged from the window hole. And since the structure for discharge | eating this chip | tip is a very simple thing which perforates a window hole in a part of protective cover body, there exists an effect that cost can also be reduced extremely.
In the first aspect of the present invention, the diameter of the roller-shaped weight is formed to have a large diameter at both ends in the width direction of the protective cover body, and a small diameter is provided at a portion where the weight passes through the window hole. Since the chip is not pressed between the outer peripheral surface of the weight at the folded portion before passing through the window hole and the inner surface of the protective cover body, the lower surface of the weight is moved by the folded portion. When the said window hole comes to the side, there exists an effect that the chip | tip on the outer peripheral side of a weight can be peeled off easily and can be discharged | emitted from a window hole.
[0025]
According to a second aspect of the present invention, in the protective cover device for a machine tool according to the first aspect, one or a plurality of the window holes are formed at portions excluding both ends in the width direction of the protective cover body. Therefore, in addition to the effect by the leaf of Claim 1, there also exists an effect that chips can be discharged over a wide range in the width direction of the protective cover body.
[0026]
[Brief description of the drawings]
FIG. 1 is a schematic side view of a machine tool and a protective cover device.
FIG. 2 is a front view of a lowering head in a lowered state.
3A is a partially cutaway front view of a protective cover body, and FIG. 3B is a partially cutaway front view of a second embodiment.
4A is a partially cutaway front view of the third embodiment, FIG. 4B is a partially cutaway front view of the fourth embodiment, and FIG. 4C is a partially cutaway front view of the fifth embodiment. FIG. 6D is a partially cutaway front view of the sixth embodiment.
FIG. 5 is a schematic side view of an embodiment in which a moving member moves horizontally.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Column 2 Processing head 10 Protection cover body 10a Flexible sheet 14, 15 Guide roller 17 Folding part 19 Roller-shaped weight 20 (20a-20j) Window hole

Claims (2)

A roller-shaped weight is rotatably disposed in a folded portion of a flexible band-shaped protective cover body disposed between a fixed member and a reciprocating moving member in a machine tool, while the reciprocating movement of the moving member In the region of the protective cover body through which the weight passes, a window hole for removing chips is formed ,
The roller-shaped weight has a large diameter at both ends in the width direction of the protective cover body, and a small diameter at a position where the weight passes through the window hole. Protective cover device for machines.   2. The protective cover device for a machine tool according to claim 1, wherein one or a plurality of the window holes are formed in a portion excluding both end portions in the width direction of the protective cover body.

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