Multi-slot perforation device

Abstract

To provide a multi-hole perforating device on a turntable of which there is not mounted a drive motor for rotating all of a plurality of drills.SOLUTION: There is provided a multi-hole perforating device which allows a drive motor 10 to be disposed outside a turntable 3, so as to avoid an increase in size of the drive motor 10 and the turntable 3, in which: the turntable 3 rotatably holds a plurality of drills 4a, 4b, 4c, 4d; upon moving to a drilling position along with angular displacement of the turntable 3, the drill 4a becomes able to descend for perforation and ascend after the perforation in cooperation through engagement with an inner tooth member 23a driven to ascend / descend by a lifting mechanism 8; and at the drilling position, a driven gear 7a meshes with a drive gear 9 provided outside the turntable 3 so as to be driven to rotate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a multiple perforating device that drills perforations by lowering one drill selected from a plurality of drills provided above into an object placed on a table below. [Background technology]

[0002] A conventional multi-hole drilling device is known, which has multiple drills mounted around a turntable. When the drill reaches a predetermined position as the turntable rotates, the drill is lowered while rotating to drill a hole in the target object (see, for example, Patent Document 1). This device mounts multiple drills and a single drive motor on the turntable. Pulleys are attached to the output shaft of the drive motor and the upper shafts of all the drills, and the rotational drive force is transmitted by a belt stretched between the pulleys. The upper shafts of each drill are provided with vertical keyways, so that only the drill used for drilling moves up and down, while the pulleys do not. Alternatively, a drive gear driven by the output shaft of the drive motor could be placed at the center of the turntable, and multiple driven gears meshing with the drive gear could be placed around it. Drills could be attached on the extensions of the shafts of each driven gear, transmitting the rotational drive force via gears. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] China Patent Publication CN109967771A Summary of the Invention [Problem to be solved by the invention]

[0004] As in Patent Document 1, rotating multiple drills with a single drive source, such as a drive motor mounted on a turntable, means that drills not being used for drilling are also rotated. This means that the drive motor, which serves as the drive source, requires a large output, which increases the size of the device, and the turntable also becomes large. Furthermore, mounting the drive motor on a rotating turntable restricts the power supply to the drive motor and the rotation of the turntable.

[0005] An object of the present invention is to provide a multiple drill perforator that does not require a drive motor for rotating all of the multiple drills on the turntable. [Means for solving the problem]

[0006] The present invention provides a drilling tool including: a turntable that rotatably holds a plurality of drills each having a driven gear at an upper portion thereof for receiving a rotational drive, and that can move a drill selected for use to a drilling position by angular displacement; a lifting mechanism that lowers the drill at the drilling position from a holding position where the drill is held by the turntable to drill the sheet material, and then lifts the drill back to the holding position; In a multiple perforating device including Outside the turntable a drive gear disposed on the drill at the drill position and meshing with a driven gear of the drill at the drill position; a drive motor disposed outside the turntable and generating a rotational drive force for the drive gear; a drive shaft disposed outside the turntable, which is driven to rotate around an upper and lower axis by a drive motor and supports the drive gear so that the drive gear can be moved in the axial direction while rotating; Further includes fruit, the lifting mechanism is operable to lift and lower only the drill at the drilling position among the plurality of drills held on the turntable, and not to lift and lower the other drills; The drive gear rises or falls while maintaining a meshed state with the driven gear even when the driven gear rises or falls with the lifting mechanism. This is a multiple perforating device characterized by the above.

[0007] The present invention also provides a rotational movement mechanism including: a base that rotatably supports the turntable; and internal teeth provided on the base, surrounding the plurality of drills, meshing with the plurality of driven gears, and rotating each of the driven gears with angular displacement of the turntable; The inner teeth have a missing portion where no tooth portion is provided near the drilling position. It is characterized by:

[0008] The present invention further includes a controller that adjusts the angle of the drive gear around the drive shaft so that smooth meshing between the driven gear and the drive gear occurs at the drilling position when the turntable is angularly displaced to move the selected drill to the drilling position. It is characterized by:

[0009] In the present invention, the turntable further includes a holding member that rotatably holds each driven gear of each drill, and that, at the drilling position, engages with a member that rotatably holds the drive gear that meshes with the driven gear, and moves up or down in cooperation with the member. It is characterized by:

[0010] In the present invention, the member with which the holding member engages is an internal tooth member that receives lifting and lowering drive from the lifting mechanism so that the internal teeth that become the tooth portion following the missing portion of the internal teeth also rise or fall together with the drive gear. It is characterized by: [Effects of the Invention]

[0011] According to the present invention, a drive motor outside the turntable rotates only the drill that has been moved to the drilling position by angular displacement of the turntable, thereby preventing the drive motor and turntable from becoming larger and preventing an increase in drive motor output.

[0012] Furthermore, according to the present invention, the recessed portion of the internal teeth is provided near the drilling position, and no teeth are provided, so the teeth of the drive gear can be exposed through the recessed portion. The driven gear of the drill, which moves to the drilling position by angular displacement of the turntable, rotates in mesh with the internal teeth up to the recessed portion, and can then skip over the recessed portion and mesh with the drive gear. The driven gear of the drill, which rotates in mesh with the drive gear at the drilling position, can skip over the recessed portion and mesh with the internal teeth by angular displacement of the turntable.

[0013] Furthermore, according to the present invention, the controller adjusts the angle of the drive gear around the drive shaft to match the deviation in the rotation angle of the driven gear that jumps over the notch portion due to the angular displacement of the turntable, thereby enabling a smooth transition of engagement between the drive gear and the internal teeth of the driven gear.

[0014] Furthermore, according to the present invention, the drive gear and driven gear are meshed together, maintaining a state in which the gears rotate without shifting vertically, while the drill can be reliably lowered or raised by the cooperation of the engagement between the members that rotatably hold the driven gear and drive gear, respectively.

[0015] Furthermore, according to the present invention, the internal tooth member that engages with the retaining member is lowered or raised, including the internal teeth that form the tooth portion following the missing portion of the internal teeth, so that the internal teeth can be lowered or raised in unison over a wider range of engagement than if they were not lowered or raised. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a front view showing the configuration of a multiple perforating device 1 according to one embodiment of the present invention. [Figure 2] FIG. 2 is a front view showing the state in which drill 4a is lowered to the drilling position in multiple perforating device 1 of FIG. 1 and is drilling holes in sheet material 21. [Figure 3] FIG. 3 is a plan view of the multiple perforating device 1 of FIG. [Figure 4] FIG. 4 is a perspective view of the multiple perforating device 1 of FIG. [Figure 5] FIG. 5 is a partial perspective view illustrating the engagement relationship between the internal teeth member 23a and the holding member 26a at the drilling position. [Figure 6] FIG. 6 is a plan view showing the arrangement of members for holding the gear shafts in the multiple perforating device 1 of FIG. [Figure 7] FIG. 7 is a gear layout diagram corresponding to FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along the line BB in FIG. [Figure 9]FIG. 9 is a cross-sectional view taken along the line CC in FIG. [Figure 10] FIG. 10 is a diagram showing the meshing state between the drive gear 9 and the driven gear 7a at the drilling position. [Figure 11] FIG. 11 is a diagram showing a configuration for adjusting the rotation angle of the drive gear 9 so that the driven gear 7a, which jumps over the missing portion 25 of the internal teeth 24, meshes smoothly. [Figure 12] FIG. 12 is a diagram showing a configuration for adjusting the rotation angle of the drive gear 9 so that the driven gear 7a meshing with the drive gear 9 can smoothly mesh with the internal teeth 24, skipping over the missing portion 25 of the internal teeth 24. DETAILED DESCRIPTION OF THE INVENTION

[0017] 1 to 12 show the configuration and operation of a multiple perforating device 1 according to one embodiment of the present invention. Corresponding parts in each figure are designated by the same reference numerals, and duplicate explanations may be omitted. For ease of explanation, parts not shown in the figure being explained may be referred to by reference numerals shown in other figures. Hidden objects may be referred to by reference numerals attached to dashed leader lines. [Example]

[0018] FIG. 1 shows the configuration of a multiple perforating device 1 according to one embodiment of the present invention. The multiple perforating device 1 is attached to, for example, the head of a cutting machine via a base 2. The head is movable along a horizontal, two-dimensional plane, and the multiple perforating device 1 attached to the head is covered with a cover, although the cover is not shown. The multiple perforating device 1 is equipped with a turntable 3. The turntable 3 rotatably holds multiple drills, for example, four drills 4a, 4b, 4c, and 4d. The following figures show drill 4a in the drilling position. The other drills 4b, 4c, and 4d can also be moved to their drilling positions by angularly displacing the turntable 3. Drill 4a in the drilling position has a driven gear 7a attached to its upper shaft 6a. The lifting mechanism 8 is located outside the turntable 3 at the drilling position and includes a lifting base 8a and a drive cylinder 8b. It lowers the drill 4a at the drilling position from a holding position held by the turntable 3 to drill a hole in the sheet material 21, then raises the drill 4a back to the holding position. The driven gear 7a at the drilling position is engaged with the drive gear 9 and driven to rotate, allowing it to lower for drilling and raise after drilling. This lifting is driven by the extension and contraction of the output shaft 8c of the drive cylinder 8b, which is supported by the lifting base 8a. The drive gear 9 is driven via a drive belt 12 from an output pulley 11 attached to the output shaft of a drive motor 10, which is located outside the turntable 3 and serves as a drive source. The drive belt 12 drives an input pulley 13. The input pulley 13 is attached to a drive shaft 14 together with the drive gear 9, and the rotation of the drive shaft 14 rotates the drive gear 9.

[0019] The base 2 includes a vertical base 2a attached to the head and two horizontal bases 2b and 2c. The horizontal bases 2b and 2c support the upper and lower tables 3a and 3b of the turntable 3 so that they can be rotated. The drills 4a, 4b, 4c, and 4c held by the turntable 3 are equipped with chucks 5a, 5b, 5c, and 5d, upper shafts 6a, 6b, 6c, and 6d, and driven gears 7a, 7b, 7c, and 7d, respectively, although only some of these are shown. Each drill 4a, 4b, 4c, and 4d may also be equipped with a scrap disposal system, such as that disclosed in Japanese Patent Application Laid-Open No. 2019-141917. The upper table 3a is driven for angular displacement via an angular displacement belt 16 by an angular displacement motor 15 attached to the horizontal base 2b outside the turntable 3. A fabric presser 17 is provided below the horizontal base 2c. The fabric presser foot 17 is angularly displaced in accordance with the angular displacement of the turntable 3, and is pushed down by the bottom of the block 18 to descend. The compression spring 19 is provided so as to be compressed when the fabric presser foot 17 descends. The block 18 is pushed down by a lifting cylinder 18a attached to the horizontal base 2c. The fabric presser foot 17 ascends when the compression spring 19, which has been compressed as it is pushed down, returns after the lifting cylinder 18a has finished pushing down the block 18. The upper table 3a and lower table 3b of the turntable 3 are connected by guide shafts 20, two of which are arranged on either side of each of the drills 4a, 4b, 4c, and 4d.

[0020] FIG. 2 shows the multiple perforating device 1 of FIG. 1 , with the fabric presser foot 17 lowered along with the drill 4a at the perforation position, perforating a sheet material 21. The sheet material 21, which may be fabric, leather, or resin, is stacked on the surface of the perforation table 22. When the multiple perforating device 1 is attached to the head of a cutting machine, the perforation table 22 serves as the cutting table of the cutting machine. The drive cylinder 8b extends the output shaft 8c, lowering the internal gear member 23a and the retaining member 26a, which respectively house the meshed drive gear 9 and driven gear 7a. The drive shaft 14 is a ball spline shaft, which can move the drive gear 9 axially while rotating the drive gear 9. The driven gear 7a descends along with the drill 4a to perforate the sheet material 21. A lift mechanism may be provided that enables the height of the multiple perforating device 1 from the surface of the perforation table 22 to be changed depending on the thickness of the stack of sheet material 21. Such a lift mechanism is disclosed, for example, in Japanese Patent Application Laid-Open No. 7-60686.

[0021] 3 and 4 are plan and perspective views, respectively, of the multiple perforating device 1 of FIG. 1. The upper table 3a and lower table 3b of the turntable 3 are supported on two horizontal bases 2b and 2c, one above the other, at their outer peripheries, allowing for angular displacement. The upper table 3a and lower table 3b are connected by a guide shaft 20 and a center plate 3c. The number of drills 4a, 4b, 4c, and 4d is not limited to four, and can be increased. The center plate 3c can be omitted by increasing the strength of the connection by the guide shaft 20.

[0022] FIG. 5(a) shows the engagement between the inner teeth member 23a and the holding member 26a at the drilling position, and FIG. 5(b) shows the state in which the engagement between the inner teeth member 23a and the holding member 26a is temporarily released. In this embodiment, engagement at the drilling position occurs not only between the inner teeth member 23a and the holding member 26a, but also between the inner teeth member 23a and the other holding members 26b, 26c, and 26d that have moved to the drilling position. The holding member 26a has a horizontal "U" shape and includes an upper engagement piece 27a and a lower engagement piece 28a. During angular displacement of the turntable 3, one or adjacent two of the four holding members 26a, 26b, 26c, and 26d engage with the inner teeth member 23a. When the inner teeth member 23a and the holding member 26a are engaged with each other, the inner teeth member 23a is sandwiched between the upper and lower engagement pieces 27a and 28a of the holding member 26a from above and below inside the turntable 3. When the lifting mechanism 8 lifts and lowers the inner teeth member 23a, the holding member 26a also lifts and lowers via the engagement. The inner teeth members 23a, 23b, 23c, and 23d may be engaged with the holding members 26a, 26b, 26c, and 26d such that the holding members 26a, 26b, 26c, and 26d are sandwiched between the inner teeth members 23a, 23b, 23c, and 23d outside the turntable 3 from above and below, respectively.

[0023] FIG. 6 shows the arrangement of the gear shaft holders in the multiple perforating device 1 of FIG. 1. The inner teeth 24a are provided on the inner periphery of the inner tooth member 23a. The upper shafts 6b, 6c, and 6d at other positions are rotatably held by holders 26b, 26c, and 26d, respectively. At the positions of the holders 26b, 26c, and 26d shown in the figure, the inner teeth members 23b, 23c, and 23d are arranged facing each other and supported by the horizontal base 2b. The inner teeth 24b, 24c, and 24d are provided on the inner periphery of the inner tooth members 23b, 23c, and 23d, respectively. The holders 26a, 26b, 26c, and 26d move with angular displacement of the turntable 3. Cross sections taken along the cross-sectional lines BB and CC are shown in FIGS. 8 and 9, respectively.

[0024] Figure 7 shows the gear arrangement corresponding to Figure 6. The internal teeth 24 are formed by internal teeth 24a, 24b, 24c, and 24d. Although the internal teeth 24a have a missing portion 25 where a tooth is missing, the internal teeth 24 mesh with the driven gears 7a, 7b, 7c, and 7c, and rotate in accordance with the angular displacement of the turntable 3. The driven gears 7a, 7b, 7c, and 7c, the drive gear 9, and the internal teeth 24 have spur teeth of the same module. The missing portion 25 is located near the drilling position and exposes the teeth of the drive gear 9 that mesh with the driven gear 7a at the drilling position. The driven gear 7a of the drill 4a, which moves to the drilling position due to the angular displacement of the turntable 3, rotates in mesh with the internal teeth 24a up to the missing portion 25. The rotation angle of the driven gear 7a is determined when it reaches the missing portion 25, and it skips over the missing portion 25 and meshes with the drive gear 9. By making the notched portion 25 smaller, it is possible to reduce the difference between the rotation angle of the driven gear 7a when it skips over the notched portion 25 and meshes with the drive gear 9, and the rotation angle when it is assumed that the internal teeth 24 continue without the notched portion 25 and mesh with the drive gear 9 at the perforation position. Similarly, by making the notched portion 25 smaller, it is possible to reduce the difference in rotation angle when the driven gear 7a, which is meshing with the drive gear 9 at the perforation position, skips over the notched portion 25 and meshes with the internal teeth 24a.

[0025] 8 and 9 are cross-sectional views taken along the line BB and the line CC in FIG. 6, respectively. FIG. 8 shows the drive gear 9, which moves the drive shaft 14 up and down, meshing with the driven gear 7a provided on the upper shaft 6a of the elevating drill 4a. The internal teeth 24c meshing with the driven gear 7c have a shorter vertical tooth length than the driven gear 7c. The other internal teeth 24a, 24b, and 24d also have shorter vertical tooth lengths than the driven gears 7a, 7b, 7c, and 7d and the drive gear 9. FIG. 9 shows the retaining members 26a and 26c engaged with the internal tooth members 23a and 23c at the upper engagement pieces 27a and 27c and the lower engagement pieces 28a and 28c, respectively, enabling interlocking. At the drilling position, any one of the holding members 26a, 26b, 26c, 26c engaged with the inner tooth member 23a is guided by the guide shaft 20, and the drive gear 9 and the respective driven gears 7a, 7b, 7c, 7d are engaged to rotate the respective drills 4a, 4b, 4c, 4d, while maintaining this state, allowing the drills 4a, 4b, 4c, 4d to be reliably lowered or raised, respectively.

[0026] Furthermore, the elevation of the internal toothed member 23a and the holding member 26a at the drilling position involves elevation of the notched portion 25 as well as the internal toothed member 24a, which is the toothed portion of the internal toothed member 24 that follows the notched portion 25. If elevation and lowering involving the internal toothed member 24a is not performed, the holding member 26a that rotatably holds the driven gear 7a and the member that rotatably holds only the drive gear 9 must be engaged and raised and lowered. This engagement requires only a narrow notched portion 25 to avoid the internal toothed member 24a, which does not rise and fall. In this embodiment, the internal toothed member 23a that engages with the holding member 26a is lowered or raised, including the internal toothed member 24a that is the toothed portion following the notched portion 25 of the internal toothed member 24. This allows for a wider engagement range between the holding member 26a and the internal toothed member 23a, allowing for more reliable coordinated lowering and raising than when the internal toothed member 24a is not raised and lowered.

[0027] Figures 10, 11, and 12 show the state in which the drive gear 9 and the driven gear 7a mesh at the drilling position, and the state in which the rotational angle of the drive gear 9 is adjusted near the drilling position when the turntable 3 rotates clockwise to enable a smooth meshing transition. At the drilling position shown in Figure 10, the drive gear 9 is adjusted so that the valleys between the teeth of the drive gear 9 mesh with the crests of the teeth of the driven gear 7a. By providing the notched portion 25, the driven gear 7a is no longer driven in accordance with the angular displacement of the turntable 3. Therefore, when meshing with the drive gear 9 from the inner teeth 24, skipping the notched portion 25, as shown in Figure 11, the controller 30 controls the drive gear 9 to advance its rotational angle counterclockwise by, for example, 2 to 3 degrees θ. After drilling is completed, the drive gear 9's rotational angle is delayed clockwise by θ, as shown in Figure 12, before skipping the notched portion 25 and meshing with the inner teeth 24a. The angle θ that allows smooth meshing over the notched portion 25 can be determined by calculation or experiment.

[0028] Alternatively, the internal teeth 24 may not be provided, and the driven gears 7a, 7b, 7c, and 7d may be held at an angle on the turntable 3 that allows them to mesh with the drive gear 9 at the drilling position, and the drive gear 9 may be moved in a horizontal plane or up and down to engage and disengage at the drilling position. As in this embodiment, the drills 4a, 4b, 4c, and 4d are driven and rotated by the drive motor 10 outside the turntable 3 through angular displacement of the turntable 3, thereby preventing the drive motor 10 and the turntable 3 from becoming larger and increasing their motor output. Furthermore, by using a drive gear with a tooth length corresponding to the elevation stroke of the driven gears 7a, 7b, 7c, and 7d during drilling, the meshed state can be maintained without raising or lowering the drive gear. [Explanation of symbols]

[0029] 1. Multi-perforation device 2. Bass 3. Turntable 4a, 4b, 4c, 4d drills 7a,7b,7c,7d Driven gear 8 Lifting mechanism 9 Drive Gear 10 Drive motor 14 Drive shaft 15 Angular Displacement Motor 21 Sheet material 23a, 23b, 23c, 23d inner tooth members 24, 24a, 24b, 24c, 24d inner teeth 25 Missing Part 26a, 26b, 26c, 26d Holding members 30 Controller

Claims

1. a turntable that rotatably holds a plurality of drills each having a driven gear at an upper portion thereof for receiving a rotational drive, and that is capable of moving a drill selected for use by angular displacement to a drilling position; a lifting mechanism that lowers the drill at the drilling position from a holding position where the drill is held by the turntable to drill the sheet material, and then lifts the drill back to the holding position; In a multiple perforating device including a drive gear disposed outside the turntable and meshing with a driven gear of the drill at the drilling position; a drive motor disposed outside the turntable and generating a rotational drive force for the drive gear; a drive shaft disposed outside the turntable, which is driven to rotate around an upper and lower axis by a drive motor and supports the drive gear so that the drive gear can be moved in the axial direction while rotating; further comprising the lifting mechanism is operable to lift and lower only the drill at the drilling position among the plurality of drills held on the turntable, and not to lift and lower the other drills; The drive gear rises or falls while maintaining a meshed state with the driven gear even when the driven gear rises or falls with the lifting mechanism. A multiple perforating device characterized by:

2. a base that rotatably supports the turntable; and internal teeth provided on the base, surrounding the plurality of drills, meshing with the plurality of driven gears, and rotating each of the driven gears with angular displacement of the turntable; The inner teeth have a missing portion where no tooth portion is provided near the drilling position.

2. The multiple perforating device according to claim 1.

3. and a controller that adjusts the angle of the drive gear around the drive shaft so that the driven gear and the drive gear are smoothly engaged at the drilling position when the turntable is angularly displaced to move the selected drill to the drilling position.

3. The multiple perforating device according to claim 2.

4. The turntable rotatably holds each driven gear of each drill, and further includes a holding member that, at the drilling position, engages with a member that rotatably holds the drive gear that meshes with the driven gear, and moves up or down in cooperation with the member.

4. The multiple perforating device according to claim 2 or 3.

5. The member with which the holding member engages is an internal tooth member that receives lifting and lowering drive from the lifting mechanism so that the internal teeth that become the tooth portion following the missing portion of the internal teeth also rise or fall together with the drive gear.

5. The multiple perforating device according to claim 4.

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