Drive mechanism

Abstract

To provide a drive mechanism capable of protecting an expensive motor and a speed reducer.SOLUTION: A drive mechanism 9 comprises a motor 10 with a brake, a speed reducer 43, and a tire coupling 53. The tire coupling comprises a first boss 61 on which a taper hole 61a is formed and a second boss 62 on which a taper hole 62a is formed. A first adapter 64 is disposed between the first boss and a drive shaft of the motor, and a second adapter 65 is disposed between the second boss and an input shaft of the speed reducer. Either of the adapters comprises a sleeve 67 and a nut 68 threadedly engaging with a screw part formed on a shaft end side of the sleeve. Then, the threaded engagement of the nut with the sleeve allows the sleeve to be taper-fitted to the taper holes; thereby, the first boss and the drive shaft of the motor and the second boss and the input shaft of the speed reducer are connected to each other, respectively.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a drive mechanism, and more particularly to a drive mechanism in which the drive shaft of a brake-equipped motor and the input shaft of a reducer are connected by a coupling. [Background technology]

[0002] Dough lifters are commonly used to transport dough to a divider or mixer in a preparation area using the sponge dough method (see, for example, Patent Document 1). A commonly known dough lifter includes left and right columns (main pillars) and a container holder that is positioned between the left and right columns and holds containers, with a rotatable screw shaft (main shaft or male screw) attached to the left and right columns, and a screw nut (female screw) that is connected to the container holder is threadedly engaged with the screw shaft, and the container holder is raised and lowered by the rotation of the screw shaft.

[0003] A known drive mechanism for this type of dough lifter is one in which a reducer is located on one side and the left and right main shafts are simultaneously driven by a chain. Another known mechanism is one in which a reducer is located in the center and the left and right main shafts are driven by a bevel gear. However, chain-type drive mechanisms have problems such as noise and scattering of foreign matter. Furthermore, bevel gear-type drive mechanisms have problems such as bevel gear damage leading to serious accidents.

[0004] Therefore, as a drive mechanism for a dough lifter that solves the above problems, a mechanism has been proposed that includes a motor with a brake, an upstream reducer connected to one main shaft, a downstream reducer connected to the other main shaft, and a drive shaft arranged between the two reducers, with the drive shaft of the motor and the input shaft of the upstream reducer connected by a tire coupling with a key joint. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 07-75478 Summary of the Invention [Problem to be solved by the invention]

[0006] In a dough lifter used in a major bread factory, a container holder lifts dough weighing approximately one ton, and the motor is started and stopped four times per raising and lowering of the container holder. In a 24-hour operation, the motor may be started and stopped approximately 400 times per day. In other words, in the drive mechanism of a dough lifter, the motor is frequently started and stopped when raising and lowering the container holder containing the heavy dough, resulting in significant impact. Therefore, even with the proposed drive mechanism for a dough lifter, the motor and reducer shafts are prone to wear due to friction against the coupling boss, necessitating the expensive replacement of the motor and reducer within as little as a few years. It is believed that the above-mentioned problem will occur in various devices other than the drive mechanism for the dough lifter, as long as the device has a connecting structure for connecting a rotary shaft to a coupling.

[0007] The present invention has been made in view of the above-mentioned current situation, and has an object to provide a drive mechanism that can protect an expensive motor and a reducer. [Means for solving the problem]

[0008] The present invention is as follows. 1. A drive mechanism comprising a motor with a brake, a reducer, and a coupling connecting a drive shaft of the motor and an input shaft of the reducer, the coupling includes a first boss having a tapered hole into which the drive shaft of the motor can be inserted, and a second boss having a tapered hole into which the input shaft of the reducer can be inserted, a first adapter is provided between the first boss and the drive shaft of the motor to connect them together; a second adapter is provided between the second boss and the input shaft of the reducer to couple them together, Each of the first adapter and the second adapter includes a sleeve having a slit portion (cut portion) and an outer circumferential surface formed in a tapered shape that can be fitted into the tapered hole, and a nut that is screwed onto a thread portion formed on an axial end side of the sleeve, A drive mechanism characterized in that the sleeve is tapered into the tapered hole by screwing the nut onto the sleeve, thereby connecting the first boss to the drive shaft of the motor and the second boss to the input shaft of the reducer. 2. A first key coupling portion is provided between the first boss and the drive shaft of the motor, coupling them together via the slit portion of the first adapter; The drive mechanism described in 1 above, wherein a second key coupling portion is provided between the second boss and the input shaft of the reducer, coupling the two via the slit portion of the second adapter. 3. A drive mechanism according to 1. or 2. above, wherein the coupling is a tire coupling. 4. A drive mechanism according to any one of 1. to 3. above, used in a dough lifter. [Effects of the Invention]

[0009] According to the drive mechanism of the present invention, the coupling includes a first boss having a tapered hole into which the motor drive shaft can be inserted, and a second boss having a tapered hole into which the reducer input shaft can be inserted. A first adapter is provided between the first boss and the motor drive shaft to couple them together, and a second adapter is provided between the second boss and the reducer input shaft to couple them together. Each of the first adapter and the second adapter includes a sleeve having a slit and a tapered outer surface that can be fitted into the tapered hole, and a nut that is threaded onto a threaded portion formed on the shaft end of the sleeve. The sleeve is tapered and fitted into the tapered hole by threading the nut onto the sleeve, thereby connecting the first boss to the motor drive shaft and the second boss to the reducer input shaft. This allows the motor and reducer shafts to be connected to the coupling boss without rubbing or wear, thereby protecting the expensive motor and reducer. As a result, repair costs can be significantly reduced by minimizing the need to replace the motor and reducer other than the brake disc. Furthermore, if a first key coupling portion is provided between the first boss and the drive shaft of the motor, coupling them via the slit portion of the first adapter, and a second key coupling portion is provided between the second boss and the input shaft of the reducer, coupling them via the slit portion of the second adapter, the shafts of the motor and the reducer are more firmly connected to the boss of the coupling. Furthermore, when the coupling is a tire coupling, the shafts of the motor and the reducer are connected to the boss of the tire coupling, which has excellent shock absorption properties, without rubbing or wearing. Furthermore, when used in a bread dough lifter, the motor is frequently started and stopped when raising and lowering a container holder containing heavy bread dough, and this can protect the expensive motor and reducer in the drive mechanism, which is subjected to large impacts. [Brief explanation of the drawings]

[0010] The present invention will be further described in the following detailed description, which provides non-limiting examples of exemplary embodiments according to the present invention, and with reference to the mentioned drawings, in which like reference numerals refer to like parts throughout the several views of the drawings. [Figure 1] FIG. 2 is an exploded perspective view of the dough lifter according to the embodiment. [Figure 2] FIG. 2 is a front view of the drive mechanism of the dough lifter. [Figure 3] FIG. 3 is an enlarged view of a main part of FIG. 2. [Figure 4] FIG. 4 is an enlarged cross-sectional view taken along line IV-IV in FIG. [Figure 5] FIG. 1 is a perspective view of a tire coupling according to an embodiment. [Figure 6] FIG. 2 is a perspective view of an adapter according to an embodiment. [Figure 7] This is an explanatory diagram of the operation of the dough lifter, where (a) shows the dough box being advanced toward the container holder, (b) shows the dough box being held in the container holder, (c) shows the container holder being raised, and (d) shows the container holder being inverted at the raised end. DETAILED DESCRIPTION OF THE INVENTION

[0011] The matters set forth herein are for illustrative purposes only and are intended to provide an illustrative description of the embodiments of the present invention, with the aim of providing what is believed to be the most effective and easily understandable explanation of the principles and conceptual features of the present invention. In this regard, it is not intended to show structural details of the present invention beyond the extent necessary for a fundamental understanding of the present invention, and the description, taken together with the drawings, will make clear to those skilled in the art how some forms of the present invention may be actually embodied.

[0012] Hereinafter, the present invention will be specifically described by way of embodiments with reference to the drawings.

[0013] As shown in Fig. 1, the dough lifter 1 according to this embodiment includes left and right columns (main pillars) 2a, 2b, and a container holder 5 disposed between the left and right columns 2a, 2b and holding a dough box (container) 4. Each of the columns 2a, 2b is provided with a rotatable screw shaft 7 extending in the vertical direction. A screw nut 8 connected to the container holder 5 is threadedly engaged with the screw shaft 7. The screw shaft 7 is rotated by a drive mechanism 9, thereby raising and lowering the screw nut 8 and the container holder 5 (see Fig. 7).

[0014] The left and right columns 2a, 2b are formed as hollow columns extending vertically. These columns 2a, 2b are erected horizontally and spaced apart. Each column 2a, 2b is equipped with a bearing case 11 that supports the upper part of the screw shaft 7 in a suspended state, and a flange unit 12 that supports the lower part of the screw shaft 7. This bearing case 11 is attached to a bracket 13 fixed to each column 2a, 2b. Furthermore, two radial bearings and one thrust bearing are provided within the bearing case 11, and high-viscosity grease is sealed in by an oil seal. This grease can leak from the bearing case 11 if the oil seal is damaged or its viscosity decreases due to deterioration or heat.

[0015] In Fig. 1, the left column 2a omits the screw shaft 7, bearing case 11, flange unit 12, etc., which are shown in the right column 2b, and the right core ram 2b omits the screw nut 8, guide portion 21, etc., which are shown in the left column 2a. Furthermore, the reference numeral "25" in Fig. 1 indicates a chute for transporting dough toward a divider or mixer (not shown).

[0016] The container holder 5 can hold containers from the open front. The container holder 5 includes left and right side plates 16, a rear plate 17 that spans between the left and right side plates 16, and a generally L-shaped support plate 18 that is provided on the inside of each side plate 16. An arm 19 is supported on the outer surface of each side plate 16 so that it can swing freely around a horizontal axis. A safety bar 20 is attached between each arm 19 to prevent the do-box 4 transferred onto the container holder 5 from jumping out forward.

[0017] A guide portion 21 for guiding the rising and falling of container holder 5 is provided on the outer surface of each side plate 16. This guide portion 21 includes a guide shaft 22 and a guide roller 23 journaled on guide shaft 22. This guide roller 23 rolls along a guide surface (not shown) provided on columns 2a and 2b as container holder 5 rises and falls. As a result, container holder 5 is raised and lowered, and also reversed at the raised end side with support shaft 37 (described later) as a fulcrum (see FIG. 7). Furthermore, the outer circumferential surface of guide roller 23 is lined with urethane resin or the like to prevent lateral wobble.

[0018] A boss 27 having a central hole into which a support shaft 37 is fitted is provided on a side surface of the container holder 5 (specifically, the outer surface of the side plate 16). The boss 27 is disposed so that its axis is aligned with the arrangement direction of the left and right columns 2a, 2b. Furthermore, the boss 27 is formed from a metal (e.g., gunmetal (BC, PBC), etc.) that is softer than the support shaft 37 and has excellent wear resistance.

[0019] The screw shaft 7 is equipped with a double-start trapezoidal or square screw. The lead of this trapezoidal or square screw can be 26 to 30 mm (preferably 26 to 28 mm). More specifically, the trapezoidal or square screw has a pitch of 13 mm, a lead of 26 mm, and an outer diameter of 60 mm. Furthermore, high-viscosity grease is applied to the screw shaft 7 and the screw nut 8. This grease is desirably replenished (reapplied) periodically because its viscosity decreases with deterioration and dust adheres to it.

[0020] A nut housing 32 is attached to the screw nut 8 so as to cover the outer periphery of the screw nut 8. The screw nut 8 has a two-start trapezoidal or square thread with a lead corresponding to the screw shaft 7. The nut housing 32 is also intended to prevent grease from scattering from the screw nut 8 and to prevent dust from entering. Furthermore, a horseshoe-shaped plate 33 and a nut guide 34 are attached in this order to the top of the nut housing 32 to prevent lateral wobble.

[0021] A support shaft 37 is provided on the outer peripheral surface of the nut housing 32. The support shaft 37 is fitted into the center hole of the boss 27 and journaled. The support shaft 37 extends along the direction in which the left and right columns 2a and 2b are aligned. The length of the support shaft 37 fitted into the boss 27 can be 80 to 120 mm (preferably 90 to 110 mm). More specifically, the length of the fit is 94 mm. The support shaft 37 is inserted into a guide wheel 38 that absorbs lateral impacts on the screw shaft 7. The guide wheel 38 is made of a metal that is softer and more wear-resistant than the support shaft 37 (e.g., gunmetal (BC, PBC)). A gap is provided at the tip of the support shaft 37 fitted into the boss 27 to absorb lateral movement of the container holder 4.

[0022] 1 and 2, the drive mechanism 9 transmits the power of one brake-equipped motor 10 to each of the screw shafts 7 of the left and right columns 2a, 2b. This drive mechanism 9 is disposed on a support part 41 that spans the upper ends of the left and right columns 2a, 2b. The drive mechanism 9 also includes the motor 10, an upstream worm gear type reducer 43 connected to one of the screw shafts 7, a downstream worm gear type reducer 44 connected to the other screw shaft 7, and a drive shaft 45 disposed between these reducers 43, 44.

[0023] The drive shaft 10a of the motor 10 and the input shaft 43a of the reducer 43 are connected by a tire coupling 53. Furthermore, the output shaft 43b of the reducer 43 is connected to the upper end of the screw shaft 7 via a chain coupling 47 (see FIG. 1). A coupling case 48 is attached to this chain coupling 47 to prevent grease from scattering and dust from entering. Furthermore, a sprocket 50 to which a chain 49 is connected is attached to the output shaft 43c of the reducer 43. This chain 49 is used to detect the number of rotations of the screw shaft 7 (i.e., the vertical position of the container holder 5).

[0024] The drive shaft 45 is supported rotatably about a horizontal axis by a plurality of (four in the figure) pillow units 51. One end of the drive shaft 45 is connected to an output shaft 43d of the reducer 43 via a tire coupling 46, and the other end is connected to an input shaft 44a of the reducer 44 via the tire coupling 46. The output shaft 44b of the reducer 44 is connected to the upper end of the screw shaft 7 via a chain coupling 47.

[0025] A low-viscosity lubricating oil is sealed inside the reducers 43, 44 by a double oil seal. This lubricating oil may leak from inside the reducers 43, 44 if the oil seal is damaged. The reducers 43, 44 are also provided with an air bleed valve to bleed air when the lubricating oil becomes hot. Furthermore, the input shafts 43a, 44a of the reducers 43, 44 are supported by thrust bearings and radial bearings, and the output shafts 43b, 44b are supported by radial bearings. In contrast, if the output shafts 43b, 44b of the reducers 43, 44 are supported by tapered roller bearings, rattles are likely to occur and lubricating oil leakage is likely to occur.

[0026] The dough lifter 1 is equipped with a motion sensor (not shown) for detecting incorrect positioning by the worker, and when the motion sensor detects it, it stops the operation of the lifter 1 or notifies the worker of an abnormality by voice, screen display, etc. Furthermore, if the worker's operating procedure differs from the proper procedure (for example, forgetting to put on the safety bar 20), the dough lifter 1 will guide the worker by voice, screen display, etc. (for example, guidance such as "Please put on the safety bar") so that the worker's operations follow the proper procedure.

[0027] In this embodiment, as shown in Figures 2 and 3, it includes a connection structure S1 of the drive shaft 10a of the motor 10 to the tire coupling 53 (exemplified as the "coupling" according to the present invention), and a connection structure S2 of the input shaft 43a of the reducer 43 to the tire coupling 53.

[0028] As shown in Fig. 3, the tire coupling 53 includes a pair of left and right flanges 54, 55, pressure rings 57, 58 attached to the flanges 54, 55 with bolts 56, and a rubber tire 59 whose end is sandwiched between the pressure rings 57, 58 and the outer periphery of the flanges 54, 55 (see Fig. 5). One flange 54 is provided with a first boss (drive-side boss) 61 having a tapered hole 61a into which the drive shaft 10a can be inserted. Furthermore, the other flange 55 is provided with a second boss (driven-side boss) 62 having a tapered hole 62a into which the input shaft 43a can be inserted. The diameter of each of these tapered holes 61a, 62a decreases outward from the bosses 61, 62.

[0029] The tire coupling 46 is selected in a size that varies depending on the output of the motor 10. For example, if the output of the motor 10 is 2.2 kW, a tire coupling with an outer diameter of 135 mm is selected, and if the output of the motor 10 is 3.7 kW, a tire coupling with an outer diameter of 155 mm is selected. In contrast, the tire coupling 53 is selected to have a predetermined size (for example, an outer diameter of 155 mm) regardless of the output of the motor 10.

[0030] A first adapter (drive-side adapter) 64 is provided between the first boss 61 and the drive shaft 10a to connect them together. A second adapter (driven-side adapter) 65 is provided between the second boss 62 and the input shaft 43a to connect them together. Each of these adapters 64, 65 includes a sleeve 67 having a slit 67a and a tapered outer circumferential surface that can fit into the tapered holes 61a, 62a, and a nut 68 that screws onto a threaded portion 67b formed on the axial end of the sleeve 67 (see FIG. 6). A washer 69 is provided between the nut 68 and the axial end surfaces of the bosses 61, 62, with a claw 69a bent to engage with an outer circumferential recess 68a of the nut 68.

[0031] In each adapter 64, 65, a nut 68 is threaded onto the threaded portion 67b of the sleeve 67 via a washer 69, thereby pulling the sleeve 67 outward from the bosses 61, 62. As a result, the outer circumferential surface of the sleeve 67 is tapered and fitted into the tapered holes 61a, 62a, and the spacing of the slits 67a becomes smaller, reducing the diameter of the sleeve 67, thereby connecting (integrating) the first boss 61 and the drive shaft 10a, and the second boss 62 and the input shaft 43a.

[0032] The adapter 65 for the input shaft 43a is selected in size according to the output of the motor 10. For example, if the output of the motor 10 is 2.2 kW, an adapter with an outer diameter of 25 mm is selected, and if the output of the motor 10 is 3.7 kW, an adapter with an outer diameter of 30 mm is selected. In contrast, the adapter 64 for the drive shaft 10a is selected to have a predetermined size (for example, an outer diameter of 28 mm) regardless of the output of the motor 10. Furthermore, the thickness of the sleeve 67 can be, for example, 3 to 4 mm.

[0033] A first key coupling portion (drive-side key coupling portion) 71 is provided between the first boss 61 and the drive shaft 10a, coupling them together via a slit 67a in the first adapter 64 (see FIG. 4). A second key coupling portion (driven-side key coupling portion) 72 is provided between the second boss 62 and the input shaft 43a, coupling them together via a slit 67a in the second adapter 65. Each of these key coupling portions 71, 72 includes a key groove 73 formed on the outer periphery of the drive shaft 10a and the input shaft 43a, a key groove 74 formed in the tapered holes 61a, 62a of each boss 61, 62, and a key 75 press-fitted into both key grooves 73, 74. The width of the key groove 74 may be, for example, 8 mm.

[0034] Next, the operation and effect of the dough lifter 1 configured as described above will be explained. First, the dough box 4 containing dough is advanced toward the container holder 5 located at the lower end (see FIG. 7(a)). Next, the safety bar 20 is lowered to hold the dough box 4 in the container holder 5 (see FIG. 7(b)). Next, the drive mechanism 9 rotates the screw shaft 7 to raise the container holder 5 (see FIG. 7(c)). At the raised end of the container holder 5, the guide part 21 rolls on the guide surface (curved surface part), inverting the container holder 5, and the dough in the dough box 4 is fed into the divider or mixer via the chute 25 (see FIG. 7(d)). Then, in the reverse order of the above operations, the container holder 5 is lowered to the lower end and the safety bar 20 is removed, allowing the empty dough box 4 to be removed from the container holder 5.

[0035] As a safety measure, the dough lifter 1 has a mechanism for stopping the container holder 5 midway before it turns over when it ascends. The container holder 5 also stops midway when it descends, and subsequent descents are controlled by a manual switch. An alarm is also activated when the container holder 5 descends.

[0036] In the drive mechanism 9 of the dough lifter 1, the motor 10 is frequently started and stopped when the container holder 5 containing the heavy dough is raised and lowered, which causes a large impact. However, since the outer peripheral surface of the sleeve 67 is tapered and fitted into the tapered holes 61a, 62a of the bosses 61, 62 of the tire coupling 53, and the boss 61 and the drive shaft 10a, and the boss 62 and the input shaft 43a are keyed together by key joints 71, 72, rubbing of the drive shaft 10a and the input shaft 43a against the bosses 61, 62 of the tire coupling 53 is prevented.

[0037] As described above, in the drive mechanism 9 of the dough lifter of this embodiment, the tire coupling 53 comprises a first boss 61 having a tapered hole 61a into which the drive shaft 10a of the motor 10 can be inserted, and a second boss 62 having a tapered hole 62a into which the input shaft 43a of the reducer 43 can be inserted. A first adapter 64 is provided between the first boss 61 and the drive shaft 10a of the motor 10 to connect the first boss 61 and the drive shaft 10a of the motor 10, and a second adapter 65 is provided between the second boss 62 and the input shaft 43a of the reducer 43 to connect the second boss 62 and the input shaft 43a of the reducer 43, and each of the first adapter 64 and the second adapter 65 comprises a sleeve 67 having a cutout portion 67a and having a tapered outer surface that can be fitted into the tapered holes 61a, 62a, and a nut 68 that is screwed onto a threaded portion 67b formed on the axial end side of the sleeve 67. The sleeve 67 is then threadedly fitted into the tapered holes 61a, 62a by threading the nut 68 onto the sleeve 67, thereby connecting the first boss 61 to the drive shaft 10a of the motor 10 and the second boss 62 to the input shaft 43a of the reducer 43. As a result, in the drive mechanism 9, where the motor 10 is frequently started and stopped when the container holder 5 containing heavy bread dough is raised and lowered, and a large impact is therefore applied as a result, the shafts 10a, 43a of the motor 10 and the reducer 43 are connected to the bosses 61, 62 of the tire coupling 53, which have excellent shock absorption properties, without rubbing or wear, thereby protecting the expensive motor 10 and the reducer 43. As a result, replacement of the motor 10 and the reducer 43 other than the brake disc is minimized, significantly reducing repair costs.

[0038] Furthermore, in this embodiment, a first key coupling portion 71 is provided between the first boss 61 and the drive shaft 10a, coupling the two together via the slit 67a of the first adapter 64, and a second key coupling portion 72 is provided between the second boss 62 and the input shaft 43a, coupling the two together via the slit 67a of the second adapter 65. This allows the shafts 10a, 43 of the motor 10 and the reducer 43 to be more firmly coupled to the bosses 61, 62 of the tire coupling 53.

[0039] The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. That is, in the above embodiment, an example is given in which both tapered fitting by the adapters 64, 65 and key coupling by the key coupling portions 71, 72 are used, but the present invention is not limited to this. For example, an example in which only tapered fitting by the adapters 64, 65 is used without providing the key coupling portions 71, 72 may also be used.

[0040] In addition, in the above embodiment, the drive mechanism 9 is provided with a tire coupling 53, but this is not limited to this, and the drive mechanism 9 may be provided with, for example, a leaf spring type, a coil spring type, a bellows type, or other coupling.

[0041] In addition, in the above embodiment, a drive mechanism 9 of a bread dough lifter 1 for transporting bread dough to the next process is exemplified, but this is not limited to this, and the drive mechanism 9 may also be a drive mechanism 9 of a lifter for a paste-like material for transporting paste-like food materials or rubber materials other than bread dough to the next process. Furthermore, it may be, for example, a drive mechanism 9 for various devices (for example, processing devices, transport devices, etc.) or robots.

[0042] Furthermore, in the above embodiment, the container (do-box) 4 with wheels is exemplified, but the present invention is not limited to this, and for example, the container may be one without wheels. [Industrial Applicability]

[0043] The present invention can be widely used as a technique for driving various devices, robots, etc. In particular, it is suitably used as a technique for driving a dough lifter. [Explanation of symbols]

[0044] 1; dough lifter, 9; drive mechanism, 10; motor with brake, 10a; drive shaft, 43; reducer, 43a; input shaft, 53; tire coupling, 61, 62; boss, 61a, 62a; tapered hole, 64, 65; adapter, 67; sleeve, 67a; slit portion, 67b; threaded portion, 68; nut, 71, 72; key coupling portion.

Claims

1. A drive mechanism including a brake-equipped motor, a reducer, and a coupling that connects a drive shaft of the motor and an input shaft of the reducer, the coupling includes a first boss having a tapered hole into which the drive shaft of the motor can be inserted, and a second boss having a tapered hole into which the input shaft of the reducer can be inserted, a first adapter is provided between the first boss and the drive shaft of the motor to connect them together; a second adapter is provided between the second boss and the input shaft of the reducer to couple them together, each of the first adapter and the second adapter includes a sleeve having a slit portion and an outer circumferential surface formed in a tapered shape so as to be fittable into the tapered hole; and a nut threaded onto a thread portion formed on an axial end side of the sleeve, The nut is threaded onto the sleeve, whereby the sleeve is tapered and fitted into the tapered hole, thereby connecting the first boss to the drive shaft of the motor and the second boss to the input shaft of the reducer, a first key coupling portion is provided between the first boss and the drive shaft of the motor, coupling them together via the slit portion of the first adapter; A drive mechanism characterized in that a second key coupling portion is provided between the second boss and the input shaft of the reducer, coupling the two together via the cutout portion of the second adapter.

2. 2. The drive mechanism according to claim 1, wherein the coupling is a tire coupling.

3. 3. The drive mechanism according to claim 1, which is used in a dough lifter.

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