Workpiece conveying device and machine tool

Abstract

The workpiece conveying apparatus includes: a base portion extending in a first direction; a housing part which is vertically arranged from the base part in a second direction orthogonal to the first direction; a sliding part disposed at a receiving position received in the receiving part; a sliding part moving mechanism for moving the sliding part from the accommodating position; a linear guide portion that guides the sliding portion in a second direction; and a workpiece gripping portion disposed on a first surface of the sliding portion in the vicinity of an end portion of the sliding portion on the opposite side from the base portion and gripping a workpiece, the distance between an end portion of the workpiece gripping portion on the base portion side and the base portion being shorter than the distance between the end portion of the sliding portion on the opposite side from the base portion and the base portion.

Description

Technical Field

[0001] The invention relates to a workpiece transporting device and a machine tool. Background Art

[0002] A mechanism is known in which a chuck hand connected to the lower surface of a plate member connected to the top of a pair of guide arms and holding a workpiece moves in the extending direction of the rack by rotating a pinion gear meshing with a rack arranged on a support frame (for example, refer to Japanese Patent Publication No. 57-163762). By using the mechanism described in Japanese Patent Publication No. 57-163762, the height of the support frame is made substantially the same as the height of the pair of guide arms, so that the workpiece transport device can be arranged even in a place where the space in the vertical direction is limited. Summary of the invention

[0003] In addition, by using the mechanism described in Japanese Patent Application Laid-Open No. 57-163762, the manufacturing cost of the system including the machine tool and the transport device can be reduced, and the space of the system including the machine tool and the transport device can be reduced. However, in the machine tool, it is desired to further miniaturize the workpiece transport device.

[0004] An object of the present invention is to provide a workpiece transport device that can be miniaturized.

[0005] The workpiece transport device of the present invention comprises: a base portion, which extends along a first direction; a receiving portion, which is arranged to stand upright from the base portion in a second direction orthogonal to the first direction; a sliding portion, which is arranged at a receiving position received in the receiving portion; a sliding portion moving mechanism, which moves the sliding portion from the receiving position; a linear guide portion, which guides the sliding portion to the second direction; and a workpiece holding portion, wherein the workpiece holding portion is arranged on a first surface of the sliding portion near the end of the sliding portion on the opposite side of the base portion to hold the workpiece, and the spacing distance between the end of the base portion side of the workpiece holding portion and the base portion is shorter than the spacing distance between the end of the sliding portion on the opposite side of the base portion and the base portion.

[0006] Furthermore, in the workpiece transport device of the present invention, preferably, the slide portion has a notch formed at an end opposite to the base portion, and at least a portion of the workpiece gripped by the workpiece gripping portion is disposed inside the notch formed in the slide portion.

[0007] Furthermore, in the workpiece transport device of the present invention, the linear guide portion preferably includes: a first linear guide configured along one of a pair of sides of the sliding portion extending in the second direction; and a second linear guide configured along the other of the pair of sides of the sliding portion extending in the second direction.

[0008] In addition, in the workpiece transport device of the present invention, it is preferred that the first linear guide has a first guide rail and a first retainer, the first guide rail is arranged on the second surface of the sliding portion opposite to the first surface and extends in the second direction, the first retainer is arranged in the receiving portion and retains the first guide rail, and the second linear guide has a second guide rail and a second retainer, the second guide rail is arranged on the second surface of the sliding portion and extends in the second direction, and the second retainer is arranged in the receiving portion and retains the second guide rail.

[0009] Furthermore, in the workpiece transport device of the present invention, it is preferable that the first guide rail and the second guide rail are arranged so as to sandwich a notch formed in the sliding portion.

[0010] Furthermore, in the workpiece transport device of the present invention, it is preferable that the housing portion has a notch formed at an end portion opposite to the base portion, and the first holder and the second holder are arranged so as to sandwich the notch formed in the housing portion.

[0011] Furthermore, in the workpiece transport device of the present invention, it is preferable that the outer end of the workpiece gripping portion is arranged at a position close to the first guide rail and the second guide rail and visible when viewed from the front in the first direction.

[0012] Furthermore, in the workpiece transport device of the present invention, the slide portion moving mechanism preferably includes a rack and a pinion, the rack being arranged on the first surface along one of a pair of sides extending in the second direction of the slide portion, and the pinion meshing with the rack.

[0013] Furthermore, in the workpiece conveying device of the present invention, the spacing distance between the end of the workpiece holding part on the opposite side of the base part and the base part is preferably equal to the spacing distance between the end of the sliding part on the opposite side of the base part and the base part, or is shorter than the spacing distance between the end of the sliding part on the opposite side of the base part and the base part.

[0014] A machine tool according to one aspect of the present invention includes: a spindle that rotatably holds a workpiece; a tool holder that holds a tool for processing the workpiece held on the spindle; and a workpiece transporting device that transports the workpiece held on the spindle, the workpiece transporting device including: a base portion that extends along a first direction; a receiving portion that is upright and configured from the base portion in a second direction orthogonal to the first direction; a sliding portion that is configured in a receiving position received in the receiving portion; a sliding portion moving mechanism that moves the sliding portion from the receiving position; a linear guide portion that guides the sliding portion in the second direction; a workpiece holding portion, the workpiece holding portion being configured on a first surface of the sliding portion near an end portion of the sliding portion on an opposite side of the base portion to hold the workpiece, the spacing distance between the end portion of the workpiece holding portion on the base portion side and the base portion being shorter than the spacing distance between the end portion of the sliding portion on an opposite side of the base portion and the base portion.

[0015] According to the present invention, the workpiece transport device can be miniaturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view of the machine tool according to the embodiment. Figure 2 After removing the shell Figure 1 A perspective view of the machine tool shown. Figure 3 It means to use Figure 1 The figure of the machine tool performing workpiece processing, (a) represents the first state, (b) represents the second state, (c) represents the third state, (d) represents the fourth state, (e) represents the fifth state, and (f) represents the sixth state. Figure 4 yes Figure 2 A three-dimensional view (one) of the workpiece handling device shown. Figure 5 yes Figure 2 A perspective view (second) of the workpiece transport device 1 shown. Figure 6 yes Figure 2 A partial perspective view of the main parts of the workpiece handling device shown. Figure 7 (a) is Figure 2 The main part of the workpiece transport device 1 shown in FIG. Figure 2 A rear view of the main parts of the workpiece transport device is shown. Figure 8 (a) is Figure 4 The three-dimensional view of the receiving portion shown (a), (b) is Figure 4 A three-dimensional view of the receiving portion shown (part 2). Fig. 9 (a) is Figure 4 The three-dimensional diagram (a) of the receiving portion, the sliding portion, the holding base, the workpiece holding portion, the linear guide portion and the sliding portion moving mechanism shown in FIG. Figure 4 A three-dimensional view (part 2) of the housing portion, the sliding portion, the holding base, the workpiece holding portion, the linear guide portion, and the sliding portion moving mechanism shown. Fig.10 yes Figure 4 A three-dimensional view of the holding base shown. Fig.11 (a) is Figure 2 The front view of the workpiece handling device shown in FIG. Figure 2 A rear view of the workpiece handling device is shown. Fig.12 After removing the horizontal stepper motor Figure 2 A partial perspective view of the workpiece handling device shown. Fig.13 (a) is to hold the workpiece W in the receiving position Figure 2 The front view of the workpiece transport device shown in FIG. 1, (b) is a view of the workpiece W being held in the receiving position. Figure 2 A rear view of the workpiece handling device is shown. Fig.14 (a) is to hold the workpiece W at the holding position Figure 2 The front view of the workpiece transport device shown in FIG. 1, (b) is a view of the workpiece W being held at the holding position. Figure 2 A rear view of the workpiece handling device is shown. DETAILED DESCRIPTION

[0017] Hereinafter, a workpiece transport device and a machine tool according to an embodiment will be described with reference to the drawings. However, it should be noted that the scope of the present invention is not limited to these embodiments but relates to the invention described in the claims and their equivalents.

[0018] Figure 1 is a perspective view of a machine tool according to an embodiment. Figure 2 After removing the shell Figure 1 A perspective view of the machine tool shown.

[0019] The machine tool 100 is a plate-type machine tool including: a bed 101 arranged in an inclined manner, a front spindle 102, a back spindle 103, a turret tool post 104, a housing 105, an NC device 110, and a workpiece transport device 1. The front spindle 102, the back spindle 103, and the turret tool post 104 are mounted on the bed 101 and accommodated in the housing 105. The front spindle 102 is a member capable of holding a workpiece and is fixed to the bed 101. The back spindle 103 is a member capable of holding a workpiece held by the front spindle 102 and is movable in two directions, the X-axis direction and the Y-axis direction, by being arranged on a moving mechanism 106 that moves along the X-axis direction and the Y-axis direction. The turret tool post 104 holds various tools and is movable in three directions, the X-axis direction, the Y-axis direction, and the Z-axis direction, by being arranged on a moving mechanism 107 that moves along the X-axis direction, the Y-axis direction, and the Z-axis direction. The rotation of the front spindle 102 and the back spindle 103 , the movement of the back spindle 103 and the turret tool post 104 , and the like are all controlled by the NC device 110 .

[0020] Figure 3 1 is a diagram showing a workpiece processing performed by the machine tool 100. Figure 3 (a) represents the first state, Figure 3 (b) represents the second state, Figure 3 (c) represents the third state, Figure 3 (d) represents the fourth state, Figure 3 (e) represents the fifth state, Figure 3 (f) represents the sixth state.

[0021] First, in the first state, the front spindle 102 holds the workpiece W. Next, in the second state, the front spindle 102 rotates the workpiece W, and the tool 108 is moved by the turret tool post 104 so that the workpiece W is processed by the tool 108 held on the turret tool post 104. When the workpiece W is processed by the tool 108, the back spindle 103 moves to a position close to the front spindle 102 and holds the workpiece W processed by the tool 108. Next, in the third state, the back spindle 103 rotates the workpiece W, and the tool 109 is moved by the turret tool post 104 so that the workpiece W is processed by the tool 109 held on the turret tool post 104. In the fourth state, after the processing of the workpiece held by the back spindle 103 is completed, the workpiece transport device 1 holds the workpiece W held by the back spindle 103. Next, in the fifth state, the workpiece transport device 1 lifts the held workpiece W and moves in the horizontal direction as indicated by the arrow. Furthermore, in the sixth state, the workpiece transport device 1 carries the gripped workpiece W out of the machine tool 100 and starts processing the next workpiece W.

[0022] Figure 4 is a perspective view of the workpiece transport device 1 (part 1), Figure 5 This is a perspective view of the workpiece transport device 1 (part 2).

[0023] The workpiece conveying device 1 includes a base portion 2, a storage portion 3, a slide portion 4, a gripping base 5, a workpiece gripping portion 6, a linear guide portion 7, and a slide portion moving mechanism 8, and carries out the workpiece W held on the back spindle 103. In addition, in the machine tool 100, the workpiece conveying device 1 carries out the workpiece W held on the back spindle 103, but in the machine tool of the embodiment, the workpiece conveying device 1 may also carry the workpiece W into the interior of the machine tool, and may also carry the workpiece W inside the machine tool.

[0024] Figure 6 is a partial perspective view of the main part of the workpiece transport device 1. Figure 7 (a) is a front view of the main part of the workpiece transport device 1, Figure 7 (b) is a rear view of the main part of the workpiece transport device 1.

[0025] The base unit 2 includes a base plate 20, a guide rail 21, a horizontal drive device 22, a power supply mechanism 23, and a base connection member 24, and is disposed near the ceiling of the housing 105 and inside the machine tool 100. The base unit 2 is disposed so as to extend along the longitudinal direction of the machine tool 100, which is also referred to as the first direction. The base plate 20 is a flat plate-shaped member, and the base connection member 24 is disposed on the upper surface, and the guide rail 21 and the horizontal drive device 22 are disposed on the lower surface, and the base unit 20 is disposed so as to extend along the long side in the first direction. The guide rail 21 is a rod-shaped member longer than the long side of the base plate 20, and is disposed so as to extend parallel to the long side of the base plate 20. The horizontal drive device 22 includes a horizontal stepping motor 25 and a rack pinion 26, and moves the storage unit 3, the slide unit 4, the holding base 5, the workpiece holding unit 6, the linear guide unit 7, and the slide unit moving mechanism 8 along the guide rail 21 in the first direction. The power supply mechanism 23 supplies a current corresponding to the control signal output from the NC device 110 to the horizontal stepping motor 25 and the vertical stepping motor 35 provided in the storage section 3. The base connection member 24 is fixed to the housing 105 near the ceiling of the housing 105. The horizontal stepping motor 25 supplies power to the horizontal driving device 22 according to the current supplied via the power supply mechanism 23. The rack pinion 26 moves the sliding section 4, the holding base 5, the workpiece holding section 6, the linear guide section 7, and the sliding section moving mechanism 8 in the first direction according to the rotation of the shaft of the horizontal stepping motor 25.

[0026] Figure 8 (a) is a three-dimensional view of the storage unit 3 (part 1), Figure 8 (b) is a perspective view of the storage portion 3 (part 2).

[0027] The storage part 3 has a first base 31, a second base 32, a front plate 33, a back plate 34, and a vertical stepping motor 35, and is arranged to stand upright from the base part 2 in a second direction perpendicular to the first direction in which the base part 2 extends, and stores the sliding part 4 in a storage position. The first base 31 is a U-shaped member having a base 36, a first arm 37, and a second arm 38, and forms a storage position for storing the sliding part 4. The base 36 has a flat plate shape and is connected to the horizontal driving device 22. The first arm 37 is a flat plate that stands upright from one end of a pair of long sides of the base 36 in a direction perpendicular to the extension direction of the base 36. The second arm 38 is a flat plate that stands upright from the other end of a pair of long sides of the base 36 in a manner opposite to the first arm 37. The second base 32 is connected to the top ends of the first arm 37 and the second arm 38 via the front plate 33. The front plate 33 is connected to the first arm 37 and the second arm 38.

[0028] The back plate 34 is a flat plate-shaped member connected to the top ends of the first arm 37 and the second arm 38 in a manner opposite to the front plate 33. The back plate 34 has a first notch 39 formed at the end opposite to the base 2. The vertical stepping motor 35 supplies power to the slide moving mechanism 8 based on the current supplied via the power supply mechanism 23.

[0029] Fig. 9 (a) is a perspective view (part 1) of the storage portion 3, the slide portion 4, the grip base 5, the workpiece gripping portion 6, the linear guide 7, and the slide portion moving mechanism 8. Fig. 9 (b) is a perspective view (part 2) of the storage portion 3, the slide portion 4, the grip base 5, the workpiece gripping portion 6, the linear guide 7, and the slide portion moving mechanism 8.

[0030] The slide portion 4 is a plate-shaped member having a second notch 40 formed at an end opposite to the base portion 2, and is held in the receiving portion 3 via a linear guide portion 7 so as to be movable in a second direction between a receiving position in the receiving portion 3 and a holding position for holding a workpiece. A holding base 5, a workpiece holding portion 6, and a slide portion moving mechanism 8 are arranged on a first surface 41 of the slide portion 4, and a linear guide portion 7 is arranged on a second surface 42 of the slide portion 4 opposite to the first surface 41.

[0031] Fig.10 It is a perspective view of the grip base 5.

[0032] The holding base 5 includes a holding drive unit 50, a first holding unit support plate 51, a second holding unit support plate 52, a first cutting oil spray unit 53, a second cutting oil spray unit 54, and a cover 55, and supports the workpiece holding unit 6 in a manner that it can move in the width direction of the sliding unit 4. The holding drive unit 50 moves the workpiece holding unit 6 supported by the first holding unit support plate 51 and the second holding unit support plate 52 in the width direction of the sliding unit 4 according to the supply of compressed air. When the compressed air is supplied to make the workpiece holding unit 6 to be in the release position for releasing the workpiece W, the holding drive unit 50 moves the first holding unit support plate 51 and the second holding unit support plate 52 outward. In addition, when the compressed air is supplied to make the workpiece holding unit 6 to be in the closed position for holding the workpiece W, the holding drive unit 50 moves the first holding unit support plate 51 and the second holding unit support plate 52 inward.

[0033] The first holding portion support plate 51 and the second holding portion support plate 52 are plate-shaped members, and are movably held and supported by the holding drive portion 50. The first cutting oil jet portion 53 and the second cutting oil jet portion 54 jet cutting oil toward the workpiece W when the workpiece W held by the workpiece holding portion 6 is processed. The cover 55 is arranged so as to cover the holding drive portion 50, the first holding portion support plate 51, the second holding portion support plate 52, the first cutting oil jet portion 53, and the second cutting oil jet portion 54.

[0034] The workpiece holding portion 6 is supported by the first holding portion support plate 51 and the second holding portion support plate 52 of the holding driving portion 50, and moves as the holding driving portion 50 moves the first holding portion support plate 51 and the second holding portion support plate 52. The workpiece holding portion 6 releases the workpiece W at the release position and holds the workpiece W at the closed position. The holding base 5 and the workpiece holding portion 6 are also called an air chuck.

[0035] Fig.11 (a) is a front view of the workpiece transport device 1, Fig.11 (b) is a rear view of the workpiece transport device 1.

[0036] The first spacing distance L1, which is the spacing distance between the end of the workpiece holding portion 6 on the side of the base portion 2 and the base portion 2, is shorter than the second spacing distance L2, which is the spacing distance between the end of the sliding portion 4 on the side opposite to the base portion 2 and the base portion 2. In addition, the third distance L3, which is the spacing distance between the end of the workpiece holding portion 6 on the side opposite to the base portion 2 and the base portion 2, is shorter than the second spacing L2, which is the spacing distance between the end of the sliding portion 4 on the side opposite to the base portion 2 and the base portion 2. Since the third distance L3 is shorter than the second spacing L2, the workpiece holding portion 6 is arranged to overlap with the second notch 40 of the sliding portion 4 when the workpiece transport device is viewed from the front.

[0037] The first spacing distance L1, the second spacing distance L2, and the second spacing distance L3 are spacing distances in the second direction between the desired reference position of the base portion 2 and the sliding portion 4 and the workpiece holding portion 6. For example, the reference position of the base portion 2 when the first spacing distance L1, the second spacing distance L2, and the second spacing distance L3 are specified may be the lower surface of the base plate 20 or the upper surface of the base plate 20.

[0038] like Fig. 9As shown, the linear guide 7 has a first linear guide 71 and a second linear guide 72, and guides the sliding part 4 to the second direction. The first linear guide 71 has a first guide rail 73 and a first retainer 74, and is arranged on the second surface 42 along one of a pair of long sides extending in the second direction of the sliding part 4. The second linear guide 72 has a second guide rail 75 and a second retainer 76, and is arranged on the second surface 42 along the other of a pair of long sides extending in the second direction of the sliding part 4. The first guide rail 73 and the second guide rail 75 are arranged along the long side of the sliding part 4. The first retainer 74 and the second retainer 76 are ball circulating linear bearings, which are also called rolling guides, and are arranged on the back plate 34.

[0039] Fig.12 It is a partial perspective view of the workpiece transport device 1 with the vertical stepping motor 35 removed.

[0040] The sliding portion moving mechanism 8 includes a rack 81 and a pinion 82. The rack 81 is arranged on the first surface 41 along one of a pair of long sides extending in the second direction of the sliding portion 4. The pinion 82 meshes with the rack 81 and is engaged with the shaft of the vertical stepping motor 35. The pinion 82 rotates with the rotation of the shaft of the vertical stepping motor 35 and moves the meshing rack 81, thereby moving the sliding portion 4 in the first direction.

[0041] Fig.13 (a) is a front view of the workpiece transport device 1 holding the workpiece W at the storage position. Fig.13 (b) is a rear view of the workpiece transport device 1 holding the workpiece W at the storage position. Fig.14 (a) is a front view of the workpiece transport device 1 holding the workpiece W at the holding position, Fig.14 (b) is a rear view of the workpiece transport device 1 holding the workpiece W at the holding position.

[0042] In both the receiving position and the holding position, the workpiece W held by the workpiece transport device 1 is arranged inside the second notch 40 formed on the slide portion 4, and when viewed from the front, it is visible in a manner overlapping the second notch 40. In addition, in the receiving position, the workpiece W held by the workpiece transport device 1 is arranged inside the first notch 39 formed on the back plate 34 in addition to the second notch 40, and when viewed from the front, it is visible in a manner overlapping the first notch 39 and the second notch 40.

[0043] In the workpiece conveying device 1, the workpiece holding portion 6 is configured to overlap with the second notch 40 of the sliding portion 4 when the workpiece conveying device 1 is viewed from the front, so the workpiece holding portion 6 is configured not to protrude from the end of the sliding portion 4 on the side opposite to the base portion 2. In the workpiece conveying device 1, the workpiece holding portion 6 is configured not to protrude from the end of the sliding portion 4 on the side opposite to the base portion 2, so that the length in the second direction can be shortened compared to the case where the workpiece holding portion protrudes from the sliding portion 4, thereby achieving miniaturization. Since the length in the second direction of the workpiece conveying device 1 is short, it can be arranged near the ceiling inside the machine tool 100.

[0044] In addition, in the workpiece conveying device 1, the workpiece W is arranged inside the first notch 39 and the second notch 40 at the receiving position, so that the lower end of the workpiece W is located at a position higher than the lower end of the sliding portion 4. The lower end of the workpiece W is located at a position higher than the lower end of the sliding portion 4, so the workpiece W can be moved in the first direction without protruding from the lower end of the sliding portion 4.

[0045] In the workpiece transport device 1 , the first guide rail 73 and the second guide rail 75 are arranged to sandwich the second notch 40 . Therefore, the workpiece W is arranged inside the second notch 40 at the storage position and the length of the storage portion 3 in the second direction can be minimized.

[0046] In the workpiece transport device 1 , the first holder 74 and the second holder 76 are arranged to sandwich the first notch 39 , so that the workpiece W is arranged inside the first notch 39 at the storage position and the lengths of the first guide rail 73 and the second guide rail 75 can be maximized.

[0047] Furthermore, since the workpiece conveying device 1 includes the sliding portion 4 which is a plate-shaped member, the rigidity can be improved compared to a workpiece conveying device which does not include a sliding portion.

[0048] In addition, in the workpiece conveying device 1, the first guide rail 73 of the first linear guide 71 and the second guide rail 75 of the second linear guide 72 are arranged so as to extend in the second direction along the long side of the sliding portion 4, so that the rigidity of the workpiece conveying device 1 can be further improved. In addition, by arranging the first guide rail 73 and the second guide rail 75 along the long side of the sliding portion 4, the sliding portion 4 can be guided in the second direction with high accuracy.

[0049] Furthermore, in the workpiece transport device 1 , the workpiece gripping portion 6 is disposed at a position visible near the first guide rail 73 and the second guide rail 75 when viewed from the front in the first direction, so that the width of the workpiece transport device 1 can be minimized.

[0050] In addition, in the workpiece conveying device 1, the linear guide 7 is arranged on the second surface 42 opposite to the first surface 41 of the sliding portion 4 on which the gripping base 5 and the workpiece gripping portion 6 are arranged, and the sliding portion moving mechanism 8 is arranged on the first surface 41 of the sliding portion 4 on which the gripping base 5 and the workpiece gripping portion 6 are arranged. The workpiece conveying device 1 can be miniaturized by optimizing the arrangement of the linear guide 7 and the sliding portion moving mechanism 8.

[0051] In the workpiece conveying device 1, the distance between the end of the workpiece gripping portion 6 on the opposite side of the base portion 2 and the base portion 2, that is, the third distance L3, is shorter than the distance between the end of the sliding portion 4 on the opposite side of the base portion 2 and the base portion 2, that is, the second distance L2. However, in the workpiece conveying device of the embodiment, the third distance L3 may be equal to the second distance L2 or longer than the second distance L2.

[0052] In addition, in the workpiece conveying device 1 , the linear guide portion 7 includes the first linear guide 71 and the second linear guide 72 . However, in the workpiece conveying device of the embodiment, the linear guide portion may include a single guide rail and a holder.

[0053] In addition, in the workpiece conveying device 1, the back plate 34 is formed with the first notch 39, but in the workpiece conveying device of the embodiment, the back plate may not be formed with a notch. When the back plate is not formed with a notch, the first retainer 74 and the second retainer 76 are arranged between the workpiece holding portion 6 and the base portion 2.

[0054] Furthermore, although the machine tool 100 includes two spindles, namely the front spindle 102 and the rear spindle 103 , the machine tool of the embodiment may include a single spindle.

Claims

1. A workpiece handling device, characterized in that: have: a base portion extending along a first direction; a receiving portion disposed upright from the base portion in a second direction orthogonal to the first direction; a sliding portion, which is arranged at a receiving position received in the receiving portion; a sliding portion moving mechanism, which moves the sliding portion from the receiving position; a linear guide portion that guides the sliding portion toward the second direction; and A workpiece holding portion is disposed near an end portion of the sliding portion on the opposite side of the base portion, and is arranged on a first surface of the sliding portion to hold the workpiece. A distance between an end portion of the workpiece gripping portion on the base portion side and the base portion is shorter than a distance between an end portion of the sliding portion on the opposite side to the base portion and the base portion.

2. The workpiece transport device according to claim 1, characterized in that: The sliding portion has a notch formed at an end opposite to the base portion. At least a portion of the workpiece gripped by the workpiece gripping portion is disposed inside the notch formed in the sliding portion.

3. The workpiece transport device according to claim 2, characterized in that: The linear guide comprises: a first linear guide disposed along one of a pair of sides of the sliding portion extending in the second direction; and The second linear guide is disposed along the other side of the pair of sides of the sliding portion extending in the second direction.

4. The workpiece transport device according to claim 3, characterized in that: The first linear guide has a first guide rail and a first retainer, the first guide rail is arranged on a second surface of the sliding portion opposite to the first surface and extends in the second direction, and the first retainer is arranged in the receiving portion and retains the first guide rail. The second linear guide includes a second guide rail, the second guide rail being arranged on the second surface of the sliding portion and extending in the second direction, and a second holder being arranged on the housing portion and holding the second guide rail.

5. The workpiece transport device according to claim 4, characterized in that: The first guide rail and the second guide rail are arranged so as to sandwich a notch formed in the sliding portion.

6. The workpiece transport device according to claim 4, characterized in that: The receiving portion has a notch formed at an end opposite to the base portion. The first holder and the second holder are arranged so as to sandwich a notch formed in the housing portion.

7. The workpiece transport device according to claim 5, characterized in that: The outer end of the workpiece gripping portion is disposed at a position close to the first guide rail and the second guide rail and visible when viewed from the front in the first direction.

8. The workpiece transport device according to claim 4, characterized in that: The sliding portion moving mechanism includes a rack and a pinion, the rack being arranged on the first surface along one of a pair of sides extending along the second direction of the sliding portion, and the pinion being meshed with the rack.

9. The workpiece handling device according to any one of claims 1 to 8, characterized in that: The spacing distance between the end of the workpiece holding portion on the opposite side of the base portion and the base portion is equal to the spacing distance between the end of the sliding portion on the opposite side of the base portion and the base portion, or is shorter than the spacing distance between the end of the sliding portion on the opposite side of the base portion and the base portion.

10. A machine tool, characterized in that: have: a spindle that rotatably holds a workpiece; a tool holder that holds a tool for machining a workpiece held on the spindle; as well as a workpiece handling device for handling a workpiece held on said spindle, The workpiece handling device comprises: a base portion extending along a first direction; a receiving portion disposed upright from the base portion in a second direction orthogonal to the first direction; a sliding portion, which is arranged at a receiving position received in the receiving portion; a sliding portion moving mechanism, which moves the sliding portion from the receiving position; a linear guide portion that guides the sliding portion toward the second direction; and A workpiece holding portion is disposed near an end portion of the sliding portion on the opposite side of the base portion, and is arranged on a first surface of the sliding portion to hold the workpiece. A distance between an end portion of the workpiece gripping portion on the base portion side and the base portion is shorter than a distance between an end portion of the sliding portion on the opposite side to the base portion and the base portion.

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