Transfer unit, transfer assembly, and transfer mechanism

Abstract

The transfer unit (1) comprises a roller unit (10) having driven rollers (103, 104) mounted on a holding bracket (101) rotatable about a vertical axis (Z), a directional transmission unit (11) by which rotation of the holding bracket (101) can be acted upon, a rotation transmission unit (12) by which rotation of the driven rollers (103, 104) can be acted upon, and a drive unit (13) having a drive shaft (131), the drive shaft (131) being operably connected to the driven rollers (103, 104) to enable their rotation, or the drive shaft being operably connected to the holding bracket (101) to enable adjustment of the direction of the driven rollers (103, 104).

Description

[Technical Field]

[0001] The present invention relates to a transfer unit for a transport system that can be combined with a transfer assembly and a transfer mechanism. [Background technology]

[0002] A known embodiment of such a transfer unit is disclosed in US Pat. No. 5,623,999. The transfer unit has a driven roller mounted on a bracket that is rotatable about a vertical axis. The orientation of the bracket is adjustable by a rack driven by a separate drive. The rotation of the roller is achieved by a belt driven by a separate drive. Such a design requires space next to the transfer unit for the separate drive. This space is often unavailable, so careful design adjustments must be made to the adjacent elements. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] European Patent No. 3105152 Summary of the Invention [Problem to be solved by the invention]

[0004] It is an object of the present invention to provide a smaller transfer unit that requires less space. [Means for solving the problem]

[0005] This problem is solved by a transfer unit having the features of claim 1. Further embodiments of the transfer unit, the transfer assembly as well as the transfer mechanism are defined by the features of the further claims.

[0006] The transfer unit according to the present invention comprises a roller unit having at least one driven roller rotatably mounted on a holding bracket about a horizontal axis, a directional transmission unit having a housing in which the holding bracket is rotatably arranged about a vertical axis, and a rotational transmission unit having a housing in which a transmission shaft is rotatably arranged about the vertical axis, the transmission shaft having a bevel gear fixed to an upper end thereof. The directional transmission unit is stacked on the rotational transmission unit, and the bevel gear engages with the at least one driven roller. The transfer unit comprises a drive unit having a housing in which a drive shaft is rotatably arranged about the vertical axis. The rotational transmission unit is stacked on the drive unit, and the drive shaft is operably connected to the transmission shaft to enable driving of the at least one driven roller. Alternatively, the drive shaft is operably connected to the holding bracket to enable adjustment of the direction of the at least one driven roller.

[0007] This design has the advantage that the drive for rotating at least one driven roller or for rotating the retaining bracket is integrated into the transport unit, thereby reducing the space required by the transport unit.

[0008] In one embodiment, the first transfer unit includes a first roller unit, the first roller unit being stacked on the first directional transmission unit, the first directional transmission unit being stacked on the first rotational transmission unit, and the first rotational transmission unit being stacked on the first drive unit. A first drive shaft of the first drive unit is directly coupled to a first transmission shaft of the first rotational transmission unit. A first pulley is disposed within the housing of the first rotational transmission unit and fixed to the first transmission shaft.

[0009] In one embodiment, the second transfer unit includes a second roller unit, the second roller unit being stacked on the second directional transmission unit, the second directional transmission unit being stacked on the second rotational transmission unit, and the second rotational transmission unit being stacked on the second drive unit. A second drive shaft of the second drive unit is coupled to the holding bracket of the second roller unit by a first spur gear, an offset shaft, and a second spur gear that extend from the second directional transmission unit to the second rotational transmission unit. A second pulley is disposed within the housing of the second rotational transmission unit and fixed to the second transmission shaft.

[0010] Since it is preferable to have identical parts, the second drive shaft can be identical to the first drive shaft. It is also possible to provide a first drive unit and a second drive unit, whose coils, cores, and bearings are identical.

[0011] In one embodiment, at least one driven roller includes a helical gear that engages with a bevel gear. The at least one driven roller includes an inner portion that includes the helical gear and a sleeve attached to the inner portion. The inner portion can be made of a first material, such as metal, and the sleeve can be made of a second material, such as plastic.

[0012] In one embodiment, the first driven roller and the second driven roller are disposed on a horizontal roller shaft, the first driven roller including a helical gear and the second driven roller having no gear mechanism.

[0013] In one embodiment, the first driven roller and the second driven roller are fixed to the roller shaft. Alternatively, they are fixed to each other.

[0014] The second driven roller may be made from the same material as the sleeve of the first driven roller.

[0015] In one embodiment, the retaining bracket comprises a cylindrical base extending along a vertical axis and two arms attached to the cylindrical base and extending in the direction of the vertical axis on two opposite sides of the cylindrical base.

[0016] In one embodiment, the cylindrical base has a spur gear on its circumference with which the rack can engage.

[0017] In one embodiment, the roller shaft is attached to two arms with roller shaft bearings.

[0018] In one embodiment, the roller unit housing laterally surrounds the retainer bracket, and a portion of the at least one driven roller protrudes from the roller unit housing. A disk-shaped cover is rotatably disposed about a vertical axis around the at least one driven roller and is flush with the top surface of the roller unit housing.

[0019] In one embodiment, at least one recess is disposed on a first sidewall and a corresponding number of complementary protrusions are disposed on a second sidewall opposite the first sidewall.

[0020] In one embodiment, the housing of the directional transmission unit comprises a first hole in which the upper part of the cylindrical base of the holding bracket is rotatably disposed, and the housing of the rotational transmission unit comprises a second hole in which the lower part of the cylindrical base of the holding bracket (101) is rotatably disposed.

[0021] The features of the above-described embodiments of the transfer unit can be used in any combination as long as they do not contradict each other.

[0022] A transport assembly according to the present invention includes one first transport unit according to the present invention, one second transport unit according to the present invention, and at least one third transport unit, where the first transport unit is disposed on a first side of the at least one third transport unit and the second transport unit is disposed on a second side of the at least one third transport unit opposite the first side. Alternatively, a transport assembly according to the present invention includes one first transport unit according to the present invention, at least one third transport unit, and one separate drive unit, where the first transport unit is disposed on a first side of the at least one third transport unit and the separate drive unit is disposed on a second side of the at least one third transport unit opposite the first side. Alternatively, the separate drive unit is disposed on the side of the first transport unit opposite the at least one third transport unit. The third transport unit includes a third roller unit, which is stacked on top of a third directional transmission unit, which is stacked on top of a third rotational transmission unit. The third pulley and the fourth pulley are disposed in a housing of the third rotational transmission unit and fixed to the third transmission shaft. The separate drive unit includes a fourth directional transmission unit, which is stacked on top of the spacer unit, which is stacked on top of the third drive unit. The spacer unit includes a housing in which a fourth transmission shaft is rotatably disposed about a vertical axis, and a third spur gear is fixed to the upper end of the fourth transmission shaft. The third drive shaft of the third drive unit is directly coupled to the fourth transmission shaft of the spacer unit. A first belt is wound around the first pulley of the first transfer unit and around the third pulley of the third transfer unit. Alternatively, the first belt is wound around the second pulley of the second transfer unit and around the third pulley of the third transfer unit. The second belt is wound around the fourth pulleys of two adjacent third transfer units. The common rack is linearly movably arranged in the first direction transmission unit of the first transfer unit, the second direction transmission unit of the second transfer unit, and the third direction transmission unit of the third transfer unit.Alternatively, the common rack is linearly movably arranged in the first directional transmission unit of the first transport unit, the third directional transmission unit of the third transport unit, and the fourth directional transmission unit of the separate drive unit.

[0023] The third drive shaft may be identical to the first drive shaft. To reduce the number of various parts, the coil, core, and bearing of the third drive unit may be identical to those of the first drive unit. Furthermore, the first roller unit, the second roller unit, and the third roller unit may be identical. The first direction transmission unit and the third direction transmission unit may also be identical. The housings of the first rotation transmission unit and the spacer unit may be identical, and the housings of the first drive unit, the second drive unit, and the third drive unit may be identical.

[0024] In one embodiment, the common rack comprises several identical rack components connected to each other in a single row, each rack component having a length of one transport unit in the direction of linear movement of the common rack.

[0025] A transfer mechanism according to the present invention comprises at least two transfer assemblies according to the above embodiments, which are arranged adjacent to each other in a first horizontal direction or in a second horizontal direction perpendicular to the first horizontal direction.

[0026] Embodiments of the present invention are described in more detail below with reference to the figures, which are illustrative only and should not be construed as limiting. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 2 is a cross-sectional view of a first transfer unit according to the present invention. [Figure 2] FIG. 2 is a cross-sectional view of a second transfer unit according to the present invention. [Figure 3]FIG. 10 is a cross-sectional view of a third transfer unit according to the present invention. [Figure 4] FIG. 10 is a top view of the first transfer unit, the second transfer unit, and the third transfer unit. [Figure 5] FIG. 10 is a cross-sectional view of a separate drive unit. [Figure 6] 1 is a perspective view of a first embodiment of a transport assembly according to the present invention; [Figure 7] FIG. 10 is a perspective view of a second embodiment of a transport assembly according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] 1 shows a cross-sectional view of a first transfer unit 1 according to the present invention. The first transfer unit 1 comprises a first roller unit 10, which is stacked on a first directional transmission unit 11, which is stacked on a first rotation transmission unit 12, which is stacked on a first drive unit 13. The first roller unit 10 comprises a housing 100 having a first side wall 1000 and an opposite second side wall 1001, wherein a recess 1002 is provided in the first side wall 1000 and a complementary protrusion 1003 is provided in the second side wall 1001. At its upper part, the housing 100 is defined by an upper plate 1004. A retaining bracket 101 is arranged in the housing 100 rotatably about a vertical axis Z. The support bracket 101 includes a cylindrical base 1010 extending along a vertical axis Z and two arms 1011 attached to the cylindrical base 1010 and extending in the direction of the vertical axis Z on two opposing side walls of the cylindrical base 1010. The cylindrical base 1010 includes an upper portion, a middle portion having a spur gear around its periphery and engaging with a rack 5, and a lower portion. A roller shaft 102 is mounted on the two arms 1011 by roller shaft bearings 106. The roller shaft 102 is rotatable about a horizontal axis X. A first driven roller 103 and a second driven roller 104 are fixed to the roller shaft 102 symmetrically with respect to the vertical axis Z. The first driven roller 103 includes an inner portion 1030 having a helical gear and a sleeve 1031. The second driven roller 104 is formed integrally and does not include a gear mechanism. A disk-shaped cover 105 is arranged rotatably about a vertical axis Z around the first driven roller 103 and the second driven roller 104. The cover 105 is substantially flush with the upper surface of the top plate 1004 of the roller unit housing 100. The first direction transmission unit 11 comprises a housing 110 with a side wall 1100 that is flush with the adjacent side walls 1000, 1001 of the first roller unit 10, and a top plate 1101 on which the housing 100 of the first roller unit 10 rests.A first hole 1102 is provided in the center of the upper plate 1101 of the first directional transmission unit 11, into which the upper portion of the cylindrical base 1010 of the holding bracket 101 is appropriately attached. The side of the bracket 101 with the arm 1011 is placed on the upper plate 1101 of the first directional transmission unit 11. A guide 1103 extending vertically from the upper plate 1101 and parallel to the side wall 1100 is integrally formed with the upper plate 1101 and the two opposing side walls. A rack 5 abuts against the guide 1103 on the side of the holding bracket 101 opposite the cylindrical base 1010. The rack 5 protrudes through two openings arranged in the two opposing side walls. The first rotational transmission unit 12 comprises a housing 120 having a sidewall 1200 flush with the adjacent sidewall 1100 of the first directional transmission unit 11 and an upper plate 1201 on which the housing 110 of the first directional transmission unit 11 is placed. A second hole 1202 is provided in the center of the upper plate 1201 of the first rotational transmission unit 12, into which the lower portion of the cylindrical base 1010 of the holding bracket 101 is appropriately mounted. A collar 125 extends vertically and concentrically from the upper plate 1201 to the second hole 1202 to form a receptacle for a lower transmission shaft bearing 126. An upper transmission shaft bearing 124 is received inside the upper region of the cylindrical base 1010 of the holding bracket 101. The first transmission shaft 121 is rotatably arranged about the vertical axis Z on the upper transmission shaft bearing 124 and the lower transmission shaft bearing 126. A bevel gear 122 is fixed to the upper end of the first transmission shaft 121, and the bevel gear 122 engages with a helical gear on the inner portion 1030 of the first driven roller 103. A first pulley 123 is fixed to the first transmission shaft 121 below a lower transmission shaft bearing 126. The first belt 6 engages with the first pulley 123. The first drive unit 13 comprises a housing 130 having a side wall 1300 flush with the adjacent side wall 1200 of the first rotational transmission unit 12, on which the housing 120 of the first rotational transmission unit 12 is placed, and a bottom plate 1301.A collar 135 extends vertically from the bottom plate 1301, concentrically about the vertical axis Z, and forms a receptacle for a bearing 136 for the first drive unit 131. A disk 132 is fixed to the upper part of the first drive shaft 131, around which a coil 133 with a corresponding core 134 is arranged. The upper end of the drive shaft 131 is coupled to the lower end of the first transmission shaft 121. The first drive unit 13 affects the rotation of the driven rollers 103, 104, the rack 5 affects the rotation of the holding bracket 101, and the first belt 6 affects the rotation of the driven roller of the adjacent transfer unit.

[0029] FIG. 2 shows a cross-sectional view of a second transfer unit 2 according to the present invention. Elements of the second transfer unit 2 that are identical to those of the first transfer unit 1 bear the same reference numerals. The second roller unit 20 is superimposed on the second directional transmission unit 21, which is superimposed on the second rotational transmission unit 22, which is superimposed on the second drive unit 23. In contrast to the first transfer unit 1, the second transfer unit 2 comprises a second transmission shaft 221 that is not coupled to the second drive shaft 231 of the second drive unit 23. The second transmission shaft 221 merely extends to a second pulley 222 that engages with the first belt 6. The second rotational transmission unit 22 comprises a housing 220 with an additional receptacle for a bearing 225 for the offset shaft 223, the rotation axis of which is parallel to the axis of the second transmission shaft 221. The offset shaft 223 extends from the second rotation transmission unit 22 to the second directional transmission unit 21. A spur gear 224 is fixed to the upper end of the offset shaft 223 and engages with a gear mechanism on the cylindrical base 1010 of the holding bracket 101. The lower end of the offset shaft 223 is provided with a gear mechanism that engages with a second spur gear 232 of the second drive unit 23. The second spur gear 232 is coupled to the second drive shaft 231 directly or via a disk 132. The second drive unit 23 affects the rotation of the holding bracket 101, the rack 5 affects the rotation of the holding bracket of the adjacent transfer unit, and the first belt 6 affects the rotation of the driven rollers 103, 104.

[0030] FIG. 3 shows a cross-sectional view of a third transfer unit 3 according to the present invention. Elements of the third transfer unit 3 identical to those of the first transfer unit 1 and the second transfer unit 2 have the same reference numerals. The third roller unit 30 is stacked on top of a third directional transmission unit 31, which is stacked on top of a third rotational transmission unit 32. In contrast to the first transfer unit 1 and the second transfer unit 2, the third transfer unit 3 does not have a drive unit. The third rotational transmission unit 32 comprises a housing 320 having an upper housing portion 3200 and a lower housing portion 3201, which together have the same outer dimensions as the combined housing of the first rotational transmission unit 12 and the first drive unit 13, or the second rotational transmission unit 22 and the second drive unit 23. A third hole 3202 is provided in the upper plate of the upper housing portion 3200, corresponding to the second hole 1202 of the first rotational transmission unit 12 or the second rotational transmission unit 22. A collar 325 extends vertically from the bottom plate of the lower housing part 3201, concentrically with the vertical axis Z, to form a receptacle for the lowest bearing 326 for the third transmission shaft 321. A third pulley 322 is fixed to the third transmission shaft 321 adjacent to the lower transmission shaft bearing 126, and a fourth pulley 323 is fixed to the third transmission shaft 321 adjacent to the third pulley 322. A first belt 6 engages the third pulley 322, and a second belt 7 engages the fourth pulley 323. A spacer 324 is arranged between the fourth pulley 323 and the lowest transmission shaft bearing 326. The rack 5 affects the rotation of the retaining bracket 101, and the first belt 6 and the second belt 7 affect the rotation of the driven rollers 103, 104 or of the driven rollers of the adjacent transfer unit.

[0031] 4 shows a top view of the first transfer unit 1, the second transfer unit 2, and the third transfer unit 3. Each of the corresponding roller units 10, 20, and 30 has a housing 100 with two adjacent first side walls 1000 with two recesses 1002 and two adjacent second side walls 1001 with two protrusions 1003 complementary to the recesses 1002. A circular opening is present in the upper plate 1004, within which a cover 105 is placed. The cover 105 has two symmetrically arranged openings through which the first driven roller 103 and the second driven roller 104 protrude.

[0032] FIG. 5 shows a cross-sectional view of a separate drive unit 4. It comprises a fourth directional transmission unit 41 superimposed on a spacer unit 42 superimposed on a third drive unit 43. The fourth directional transmission unit 41 has a housing 410 with a closed upper plate. The housing 120 of the spacer unit 42 is identical to that of the first rotation transmission unit 12. The third drive unit 43 is identical to the first drive unit 13. A fourth transmission shaft 421 is rotatably mounted around the vertical axis Z in a corresponding lower transmission shaft bearing 126. The lower end of the fourth transmission shaft 421 is coupled to a third drive shaft 431. A third spur gear 422 is fixed to the upper end of the fourth transmission shaft 421, engaging with a rack 5. The rack 5 affects the rotation of the support bracket of the adjacent transfer unit.

[0033] 6 shows a perspective view of a first embodiment of a transfer assembly according to the invention. One first transfer unit 1, followed by several third transfer units 3, followed by one second transfer unit 2, are arranged in a single row on a profile 8. A rack 5 runs through all the transfer units and synchronizes the rotation of all their retaining brackets. A first belt synchronizes the rotation of the driven rollers of the second transfer unit 2 with those of the adjacent third transfer unit 3, and a second belt alternates with the first belt, synchronizing the rotation of the driven rollers of two adjacent third transfer units 3, or first transfer units 1.

[0034] FIG. 7 shows a perspective view of a second embodiment of a transport assembly according to the present invention. One separate drive unit 4, followed by one first transport unit 1 and several third transport units 3, is arranged in a first single row on a profile 8. Identical arrangements are provided next to each other. A rack 5, comprising several identical rack sections 50, extends through the separate drive units 4 and all transport units. The rack 5 is driven by the separate drive unit 4 and synchronizes the orientation of all the holding brackets of the transport units, and therefore the orientation of all the corresponding driven rollers. A first belt synchronizes the rotation of the driven rollers of the first transport unit 1 with that of the adjacent third transport unit 3. A second belt 7 synchronizes the rotation of the driven rollers of two adjacent third transport units 3. [Explanation of symbols]

[0035] 1. First Transfer Unit 10 First roller unit 100 Housing 1000 First side wall 1001 Second side wall 1002 recess 1003 Protrusion 1004 Upper plate 101 Retaining bracket 1010 Cylindrical base 1011 Arm 102 Roller shaft 103 first driven roller 1030 Inner part 1031 Sleeve 104 second driven roller 105 Cover 106 Roller shaft bearing 11 First direction transmission unit 110 Housing 1100 side wall 1101 Upper plate 1102 First Hole 1103 Guide 12 First rotation transmission unit 120 Housing 1200 side wall 1201 Upper plate 1202 Second Hole 121 First transmission shaft 122 Bevel gear 123 First Pulley 124 Upper transmission shaft bearing 125 Color 126 Lower transmission shaft bearing 13 First drive unit 130 Housing 1300 side wall 1301 Bottom Plate 131 First drive shaft 132 discs 133 Coil 134 cores 135 Color 136 Bearings 2 Second Transfer Unit 20 Second roller unit 21 Second direction transmission unit 22 Second rotation transmission unit 220 Housing 221 Second transmission shaft 222 Second Pulley 223 offset shaft 224 First Spur Gear 225 bearings 23 Second drive unit 231 Second drive shaft 232 Second Spur Gear 3 Third Transfer Unit 30 Third roller unit 31 Third direction transmission unit 32 Third rotation transmission unit 320 Housing 3200 Upper housing part 3201 Lower housing part 3202 Third Hole 321 Third Transmission Shaft 322 Third Pulley 323 Fourth Pulley 324 Spacer 325 Color 326 Bearings 4 Separate drive units 41 Fourth Directional Transmission Unit 410 Housing 42 Spacer unit 421 Fourth Transmission Shaft 422 Third Spur Gear 43 Third Drive Unit 431 Third Drive Shaft 5 racks 50 Rack section 6 First Belt 7 Second Belt 8 Shapes X horizontal axis Z vertical axis

Claims

1. A transfer unit (1, 2) comprising: a roller unit (10) comprising at least one driven roller (103, 104) rotatably mounted on a holding bracket (101) about a horizontal axis (X); a directional transmission unit (11, 21) comprising a housing (110, 210) in which the holding bracket (101) is arranged rotatably around a vertical axis (Z); a rotational transmission unit (12, 22) comprising a housing (120, 220) in which a transmission shaft (121, 221) is arranged rotatably around the vertical axis (Z), and a bevel gear (122) is fixed to an upper end of the transmission shaft (121, 221) of the rotational transmission unit (12, 22); Equipped with The direction transmission unit (11, 21) is stacked on the rotation transmission unit (12, 22), In the transport unit (1, 2), the bevel gear (122) engages with the at least one driven roller (103), The transfer unit (1, 2) comprises a drive unit (13, 23) having a housing (130) in which a drive shaft (131, 231) is arranged rotatably around the vertical axis (Z), The rotation transmission unit (12, 22) is stacked on the drive unit (13, 23), said drive shaft (131) is operatively connected to said transmission shaft (121) so as to enable driving of said at least one driven roller (103); or the drive shaft (231) is operatively connected to the retainer bracket (101) to allow adjustment of the orientation of the at least one driven roller (103); A transfer unit (1, 2) characterized in that:

2. The first transport unit (1) comprises a first roller unit (10), the first roller unit (10) is stacked on a first direction transmission unit (11), the first direction transmission unit (11) is stacked on a first rotation transmission unit (12), and the first rotation transmission unit (12) is stacked on a first drive unit (13); a first drive shaft (131) of the first drive unit (13) is directly coupled to a first transmission shaft (121) of the first rotation transmission unit (12); 2. The transfer unit according to claim 1, wherein a first pulley (123) is arranged in the housing (120) of the first rotation transmission unit (12) and fixed to the first transmission shaft (121).

3. The second transport unit (2) comprises a second roller unit (20), the second roller unit (20) is stacked on a second directional transmission unit (21), the second directional transmission unit (21) is stacked on a second rotation transmission unit (22), and the second rotation transmission unit (22) is stacked on a second drive unit (23); a second drive shaft (231) of the second drive unit (23) is coupled to the holding bracket (101) of the second roller unit (20) by a first spur gear (224), an offset shaft (223) and a second spur gear (232) which extend from the second direction transmission unit (21) to the second rotation transmission unit (22); 2. The transfer unit according to claim 1, wherein a second pulley (222) is arranged in the housing (220) of the second rotation transmission unit (22) and fixed to a second transmission shaft (221).

4. 4. A transfer unit according to any one of claims 1 to 3, wherein said at least one driven roller (103) comprises a helical gear that engages with said bevel gear (122).

5. 2. The transfer unit of claim 1, wherein a first driven roller (103) and a second driven roller (104) are arranged on a horizontal roller shaft (102), the first driven roller (103) having a helical gear and the second driven roller (104) having no gear mechanism.

6. 6. A transfer unit according to claim 5, wherein the first driven roller (103) and the second driven roller (104) are fixed to the roller shaft (102) or to each other.

7. 2. The transfer unit of claim 1, wherein the holding bracket (101) comprises a cylindrical base (1010) extending along the vertical axis (Z), and two arms (1011) attached to the cylindrical base (1010) and extending in the direction of the vertical axis (Z) on two opposite side walls of the cylindrical base (1010).

8. 8. A transfer unit according to claim 7, wherein the cylindrical base (1010) is provided with a spur gear on the circumference of the cylindrical base (1010), with which a rack (5) can engage.

9. 9. A transfer unit according to any one of claims 5 to 8, wherein the roller shaft (102) is attached to the two arms (1011) by roller shaft bearings (106).

10. 2. The transfer unit of claim 1, wherein a roller unit housing (100) laterally surrounds the retaining bracket (101), a portion of the at least one driven roller (103) protrudes from the roller unit housing (100), and a disk-shaped cover (105) is arranged around the at least one driven roller (103) rotatably about the vertical axis (Z) and flush with an upper surface of an upper plate (1004) of the roller unit housing (100).

11. 11. The transfer unit of claim 10, wherein at least one recess (1002) is disposed on a first side wall (1000) and a corresponding number of complementary protrusions are disposed on a second side wall (1001) disposed opposite the first side wall (1000).

12. the housing (110, 210) of the directional transmission unit (11, 21) has a first hole (1102) in which an upper portion of the cylindrical base (1010) of the holding bracket (101) is rotatably disposed; 2. The transfer unit of claim 1, wherein the housing (120, 220) of the rotational transmission unit (12, 22) has a second hole (1202) in which a lower portion of the cylindrical base (1010) of the holding bracket (101) is rotatably positioned.

13. 1. A transfer assembly comprising: A system comprising one first transfer unit (1) according to claim 2, one second transfer unit (2) according to claim 3, and at least one third transfer unit (3), wherein the first transfer unit (1) is arranged on a first side of the at least one third transfer unit (3), and the second transfer unit (2) is arranged on a second side of the at least one third transfer unit (3) opposite to the first side, or a first transfer unit (1), at least one third transfer unit (3), and one separate drive unit (4), wherein the first transfer unit (1) is arranged on a first side of the at least one third transfer unit (3), and the separate drive unit (4) is arranged on a second side of the at least one third transfer unit (3) opposite to the first side, or the separate drive unit (4) is arranged on a side of the first transfer unit (1) opposite to the at least one third transfer unit (3); The third transfer unit (3) comprises a third roller unit (30), the third roller unit (30) is stacked on a third direction transmission unit (31), and the third direction transmission unit (31) is stacked on a third rotation transmission unit (32); The third pulley (322) and the fourth pulley (323) are disposed in the housing (320) of the third rotation transmission unit (32) and fixed to the third transmission shaft (321); The separate drive unit (4) comprises a fourth direction transmission unit (41), the fourth direction transmission unit (41) is stacked on a spacer unit (42), and the spacer unit (42) is stacked on a third drive unit (43); The spacer unit (42) includes a housing (420) in which a fourth transmission shaft (421) is disposed rotatably around the vertical axis (Z), and a third spur gear (422) is fixed to an upper end of the fourth transmission shaft (421); a third drive shaft (431) of the third drive unit (43) is directly coupled to the fourth transmission shaft (421) of the spacer unit (42); a first belt (6) wrapped around the first pulley (123) of the first transfer unit (1) and around the third pulley (322) of the third transfer unit (3), or the first belt (6) is wound around the second pulley (222) of the second transfer unit (2) and around the third pulley (322) of the third transfer unit (3); a second belt (7) is wound around the fourth pulleys (323) of two adjacent third transfer units (3); a common rack (5) is arranged so as to be linearly movable in the first direction transmission unit (11) of the first transfer unit (1), the second direction transmission unit (21) of the second transfer unit (2), and the third direction transmission unit (31) of the third transfer unit (3); or A transport assembly, wherein the common rack (5) is linearly movably arranged in the first directional transmission unit (11) of the first transport unit (1), the third directional transmission unit (31) of the third transport unit (3), and the fourth directional transmission unit (41) of the separate drive unit (4).

14. 14. A transport assembly according to claim 13, wherein the common rack (5) comprises several identical rack sections (50) connected to each other in a single row, each rack section (50) having a length of one transport unit in the direction of linear movement of the common rack (5).

15. A transfer mechanism comprising at least two transfer assemblies according to claim 13 arranged adjacent to each other in a first horizontal direction or in a second horizontal direction perpendicular to the first horizontal direction.

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