Automatic sewing mechanism for intelligent sewing workstation

Abstract

An automatic sewing mechanism for an intelligent sewing workstation comprises a rotary workbench, and a feeding workbench, a sewing machine workbench and a transferring mechanism are arranged on the front side, the right side and the rear side of the rotary workbench respectively. A rotating plate is rotationally connected to the rotating workbench, a rotating motor is installed in the rotating workbench, and a driving shaft of the rotating motor is in transmission connection with the rotating plate. A tray is installed on the side edge of the rotating plate, a supporting column is arranged in the rotating workbench, a material pressing tool is installed at the upper end of the supporting column, and the material pressing end of the material pressing tool corresponds to the upper surface of the tray on the right side edge of the rotating plate. A mechanical arm is arranged on the discharging workbench, and a material tray is arranged on the discharging workbench. A sewing machine head assembly is installed on the sewing machine workbench through a horizontal two-dimensional moving mechanism. The automatic cloth sewing machine overcomes the defects in the prior art, continuous and automatic sewing operation of cloth can be achieved, production efficiency is greatly improved, and meanwhile material waste and the unqualified product rate caused by human factors are reduced.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to sewing equipment, and specifically relates to an automatic sewing mechanism for an intelligent sewing workstation. Background Art

[0002] In the prior art, sewing operations mostly rely on manual operation. The material is manually placed on the sewing template, and sewing is carried out through multiple positioning and manual operations. This method not only has low efficiency, but also requires a high degree of proficiency of the operator, making it difficult for new employees to quickly adapt to production requirements. At the same time, due to the errors and waiting time of manual operation, problems such as material misalignment are likely to occur during the sewing process, affecting product quality. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides an automatic sewing mechanism for an intelligent sewing workstation, which overcomes the deficiencies of the prior art, can realize continuous automatic sewing operations of fabrics, can effectively reduce manual intervention, thereby greatly improving production efficiency, and at the same time reducing material waste and defective product rate caused by human factors.

[0004] To achieve the above objectives, the utility model is realized through the following technical solutions:

[0005] An automatic sewing mechanism for an intelligent sewing workstation, including a rotating workbench. A feeding workbench is arranged on the front side of the rotating workbench, a sewing machine workbench is arranged on the right side of the rotating workbench, and a transfer mechanism is installed at the rear edge position of the rotating workbench;

[0006] A rotating plate is rotatably connected above the rotating workbench through a rotating bearing. A rotating motor is installed inside the rotating workbench, and the driving shaft of the rotating motor is in transmission connection with the rotating plate; trays are symmetrically installed at the four side edges of the rotating plate in a central symmetry manner. Support columns are arranged inside the rotating workbench. Through holes are formed on the surface of the rotating plate. The upper ends of the support columns pass through the through holes and are installed with pressing tooling, and the pressing end of the pressing tooling corresponds to the upper surface of the tray on the right side edge of the rotating plate;

[0007] A manipulator is arranged on the feeding workbench. A material tray is arranged on the upper surface of the feeding workbench, and the upper surface of the material tray is used for placing fabrics. The manipulator is used to grab the fabrics on the upper surface of the material tray and transfer them to the tray on the front side edge of the rotating plate;

[0008] A horizontal two-dimensional moving mechanism is installed on the upper surface of the sewing machine workbench, and a sewing head assembly is installed on the horizontal two-dimensional moving mechanism. The sewing end of the sewing head assembly corresponds to the upper and lower positions of the tray on the right side edge of the rotating plate;

[0009] The mobile end of the transfer mechanism corresponds to the tray on the rear side of the rotating plate up and down.

[0010] Preferably, the material pressing tooling includes a mounting plate fixedly installed at the upper end of the support column. One side of the mounting plate is connected with a rotating plate through a hinge. The other side of the mounting plate is fixedly installed with a support plate. One end of a telescopic cylinder is connected to the upper part of the support plate through a hinge seat. The other end of the telescopic cylinder is connected to the upper surface of the rotating plate through a hinge seat. The lower end of the rotating plate away from the hinge is connected with a pressing plate through a connecting piece. The front end of the pressing plate is connected with a sewing template through bolts. The sewing template corresponds to the tray up and down.

[0011] Preferably, the connecting piece includes a connecting seat fixedly installed on the pressing plate. A connecting block is connected above the connecting seat. A locking stud is arranged above the connecting block. The locking stud passes through the rotating plate and is threadedly connected with a locking handle.

[0012] Preferably, the horizontal two-dimensional moving mechanism includes an X-axis screw slide table fixedly installed on the upper surface of the sewing machine workbench. A Y-axis screw slide table is slidably connected above the X-axis screw slide table through a screw slider. A moving seat is slidably connected above the Y-axis screw slide table through a screw slider. The sewing machine head assembly is installed on the upper surface of the moving seat.

[0013] Preferably, the transfer mechanism includes a column. A translation cross frame is installed above the column. A screw rod is installed on the translation cross frame through a bearing seat. One end of the screw rod is in transmission connection with the driving end of a screw rod motor. A screw slider is threadedly connected to the surface of the screw rod. A lifting cylinder mounting frame is fixedly installed on the screw slider. A lifting cylinder is installed on the side of the lifting cylinder mounting frame. The lower part of the lifting cylinder is connected with a suction cup frame through a telescopic rod. A suction cup is arranged below the suction cup frame.

[0014] Preferably, placing grooves are formed on the four side edges of the rotary worktable. The tray is placed in the placing grooves. Positioning holes are formed on the surface of the tray. Positioning pins and fixing columns are respectively arranged on the side edges of the placing grooves. The positioning pins are matched with the positioning holes. A semi-circular locking block is rotatably connected to the fixing column. The semi-circular locking block is in movable contact with the side edge of the tray.

[0015] The utility model provides an automatic sewing mechanism for an intelligent sewing workstation, which has the following beneficial effects: Through the mutual cooperation of the rotary worktable, the rotary motor, the manipulator, the horizontal two-dimensional moving mechanism, the sewing machine head assembly, the material pressing tooling and the transfer mechanism, continuous automatic sewing operation of fabrics can be realized, effectively reducing manual intervention, thus greatly improving production efficiency and at the same time reducing material waste and defective product rate caused by human factors. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the prior art.

[0017] Figure 1 Structural schematic diagram of the present utility model;

[0018] Figure 2 Structural schematic diagram of the cooperation between the rotating motor and the rotating plate in the present utility model;

[0019] Figure 3 Structural schematic diagram of the rotating workbench in the present utility model;

[0020] Figure 4 Structural schematic diagram of the material pressing tooling in the present utility model;

[0021] Figure 5 Structural schematic diagram of the sewing machine workbench in the present utility model;

[0022] Figure 6 Structural schematic diagram of the transfer mechanism in the present utility model;

[0023] Figure 7 Structural schematic diagram of the tray in the present utility model;

[0024] Explanation of the reference numerals in the figure:

[0025] 1. Rotating workbench; 11. Rotating plate; 12. Rotating motor; 13. Tray; 14. Support column; 15. Material pressing tooling; 151. Mounting plate; 152. Rotating plate; 153. Support plate; 154. Telescopic cylinder; 155. Pressing plate; 156. Connecting seat; 157. Connecting block; 158. Locking stud; 159. Locking handle; 1510. Sewing template; 16. Circular locking block;

[0026] 2. Loading workbench; 21. Manipulator; 22. Material tray;

[0027] 3. Sewing machine workbench; 31. Sewing head assembly; 32. X-axis lead screw slide; 33. Y-axis lead screw slide; 34. Moving seat;

[0028] 4. Transfer mechanism; 41. Column; 42. Translational cross frame; 43. Lifting cylinder mounting frame; 44. Lifting cylinder; 45. Suction cup frame. Detailed implementation manners

[0029] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the present utility model in conjunction with the drawings in the present utility model.

[0030] Embodiment 1, as Figures 1 to 7 shown, an automatic sewing mechanism for an intelligent sewing workstation, comprising a rotating workbench 1, a material feeding workbench 2 is arranged on the front side of the rotating workbench 1, a sewing machine workbench 3 is arranged on the right side of the rotating workbench 1, and a transfer mechanism 4 is installed at the rear edge position of the rotating workbench 1;

[0031] A rotating plate 11 is arranged above the rotating workbench 1, a rotating bearing is arranged between the rotating workbench 1 and the rotating plate 11, the rotating workbench 1 is connected to the inner ring of the rotating bearing, and the rotating plate 11 is connected to the outer ring of the rotating bearing, so that the rotating plate 11 can rotate relative to the rotating workbench 1. A rotating motor 12 is installed inside the rotating workbench 1, a driving gear is installed on the driving shaft of the rotating motor 12, a driven gear ring is installed on the outer surface of the outer ring of the rotating bearing, and the rotating motor 12 is meshed with the external teeth of the driven gear ring through the driving gear to drive the rotating plate 11 to rotate; Four side edges of the rotating plate 11 are symmetrically installed with trays 13 at the center. Support columns 14 are arranged inside the rotating workbench 1. A through hole is formed in the middle of the rotating plate 11. The upper end of the support column 14 passes through the through hole and a material pressing tool 15 is installed. The material pressing end of the material pressing tool 15 corresponds to the upper surface of the tray 13 on the right side edge of the rotating plate 11;

[0032] A manipulator 21 is arranged on the material feeding workbench 2, a material tray 22 is arranged on the upper surface of the material feeding workbench 2, the upper surface of the material tray 22 is used for placing fabrics, and the manipulator 21 is used for grasping the fabrics on the upper surface of the material tray 22 and transferring them to the tray 13 on the front side edge of the rotating plate 11;

[0033] A horizontal two-dimensional moving mechanism is installed on the upper surface of the sewing machine workbench 3, a sewing machine head assembly 31 is installed on the horizontal two-dimensional moving mechanism, and the sewing end of the sewing machine head assembly 31 corresponds to the tray 13 on the right side edge of the rotating plate 11 up and down;

[0034] The moving end of the transfer mechanism 4 corresponds to the tray 13 on the rear side edge of the rotating plate 11 up and down.

[0035] Working principle:

[0036] During use, first, the fabrics are laid on the material tray 22 manually. After the laying is completed, the manipulator 21 is controlled to respectively grasp one or more corresponding fabrics on the material tray 22 and transfer them to the tray 13 on the front side edge of the rotating plate 11, so that the fabrics to be sewn are stacked on the tray 13; Then, the driving shaft of the rotating motor 12 is controlled to rotate to drive the rotating plate 11 to rotate counterclockwise by 90 degrees, so that the tray 13 with the fabrics placed thereon rotates to a position corresponding to the sewing machine workbench 3.

[0037] At this time, control the pressing end of the material pressing tooling 15 to press downward above the tray 13 with the fabric placed thereon, so as to press the fabric above the tray 13 tightly. Then, control the horizontal two-dimensional moving mechanism to drive the sewing head assembly 31 to move on the horizontal plane in the X-axis direction and the Y-axis direction, and at the same time control the sewing head assembly 31 to operate to sew the fabric around the upper surface of the tray 13. In this embodiment, a pneumatic scissors can be installed on the side of the sewing head assembly 31, so that after sewing is completed, the thread can be cut by controlling the pneumatic scissors. Since the pneumatic scissors adopt the existing technology, it will not be elaborated here. At the same time, control the manipulator 21 to grab and transfer each fabric on the material tray 22 again and stack them on the tray 13 located at the front side of the rotating plate 11 at this time.

[0038] After sewing is completed, first control the pressing end of the material pressing tooling 15 to lift upward, and then control the driving shaft of the rotating motor 12 to drive the rotating plate 11 to rotate counterclockwise by 90 degrees, so that the sewn fabric rotates to the position corresponding to the transfer mechanism 4 along with the tray 13. Then, the transfer mechanism 4 can adsorb the sewn fabric on the tray 13 and transfer it to the subsequent station. At the same time, the tray 13 with the fabric placed on the front side of the rotating plate 11 rotates to the position corresponding to the sewing machine workbench 3 again. Therefore, control the pressing end of the material pressing tooling 15 to press downward above the tray 13 with the fabric placed thereon again, control the horizontal two-dimensional moving mechanism to drive the sewing head assembly 31 to move on the horizontal plane, and at the same time control the sewing head assembly 31 to sew again. At the same time, control the manipulator 21 to grab and transfer each fabric on the material tray 22 again and stack them on the tray 13 located at the front side of the rotating plate 11 at this time. Then repeat the above steps to realize the automatic sewing operation of the fabric. And through the mutual cooperation of the rotating workbench 1, the manipulator 21, the horizontal two-dimensional moving mechanism and the transfer mechanism 4, the working efficiency is also greatly increased, and it has the advantages of saving beats, wide application range and good stability.

[0039] In this embodiment, both the manipulator 21 and the sewing head assembly 31 adopt the well-known technical solutions in the existing technology, which are already understood by those skilled in the art and will not be elaborated here.

[0040] Embodiment 2, as a further preferred solution of Embodiment 1, the material pressing tooling 15 includes a mounting plate 151 which is fixedly installed at the upper end of the support column 14. One side surface of the mounting plate 151 is connected with a rotating plate 152 through a hinge. Another side of the mounting plate 151 is fixedly installed with a support plate 153. One end of a telescopic cylinder 154 is connected above the support plate 153 through a hinge seat, and the other end of the telescopic cylinder 154 is connected to the upper surface of the rotating plate 152 through a hinge seat. The lower end of the rotating plate 152 away from the hinge is connected with a pressing plate 155 through a connecting member. The front end of the pressing plate 155 is connected with a sewing template 1510 through bolts, and the sewing template 1510 corresponds to the tray 13 up and down.

[0041] When controlling the material pressing tooling 15 to press and fix the fabric above the tray 13, the telescopic shaft of the telescopic cylinder 154 can be controlled to extend, so as to drive the rotating plate 152 to rotate downward around the hinge, thereby giving a downward acting force to the pressing plate 155, so that the sewing template 1510 is pressed above the tray 13; then the pressing and fixing of the fabric is realized, and sewing can be carried out in cooperation with the sewing head assembly 31 through the sewing template 1510.

[0042] Embodiment 3, as a further preferred solution of Embodiment 2, the connecting member includes a connecting seat 156 which is fixedly installed on the pressing plate 155. A connecting block 157 is connected above the connecting seat 156. A locking stud 158 is arranged above the connecting block 157. The locking stud 158 passes through the rotating plate 152 and is threadedly connected with a locking handle 159. Therefore, when installing the pressing plate 155, the connecting block 157 can be installed on the connecting seat 156 first, and then the locking stud 158 is passed through the rotating plate 152 and connected with the locking handle 159, so that the locking stud 158 can be locked and limited through the locking handle 159, and then the installation and fixing work of the pressing plate 155 is realized.

[0043] Embodiment 4, as a further preferred solution of Embodiment 1, the horizontal two-dimensional moving mechanism includes an X-axis screw slide 32 which is fixedly installed on the upper surface of the sewing machine workbench 3. A Y-axis screw slide 33 is slidably connected above the X-axis screw slide 32 through a screw slider. A moving seat 34 is slidably connected above the Y-axis screw slide 33 through a screw slider. The sewing head assembly 31 is installed on the upper surface of the moving seat 34.

[0044] When controlling the movement of the sewing head assembly 31 on the horizontal plane of the X / Y axis, the operation of the X-axis lead screw slide 32 can be controlled to drive the entire Y-axis lead screw slide 33 and the sewing head assembly 31 to move arbitrarily in the X-axis direction through the lead screw slider. By controlling the operation of the Y-axis lead screw slide 33, the sewing head assembly 31 can be driven to move arbitrarily in the Y-axis direction through the lead screw slider, thereby ensuring that the sewing head assembly 31 moves arbitrarily on the horizontal plane. Thus, by controlling the operation of the X-axis lead screw slide 32 and the Y-axis lead screw slide 33, the sewing head assembly 31 can be driven to move and sew along a set route on the upper surface of the tray 13.

[0045] In this embodiment, both the X-axis lead screw slide 32 and the Y-axis lead screw slide 33 adopt well-known technical solutions in the prior art, which are already understood by those skilled in the art and will not be elaborated here.

[0046] Embodiment 5, as a further preferred solution of Embodiment 1, the transfer mechanism 4 includes a column 41. Above the column 41, a translation cross frame 42 is installed. A lead screw is installed on the translation cross frame 42 through a bearing seat. One end of the lead screw is in transmission connection with the driving end of a lead screw motor. A lead screw slider is connected to the surface of the lead screw by a thread. An elevating cylinder mounting bracket 43 is fixedly installed on the lead screw slider. An elevating cylinder 44 is installed on the side of the elevating cylinder mounting bracket 43. The lower part of the elevating cylinder 44 is connected to a suction cup bracket 45 through a telescopic rod. A suction cup is arranged below the suction cup bracket 45.

[0047] When controlling the transfer mechanism 4 to adsorb the sewn fabric on the tray 13 and transfer it to the subsequent work station, first control the lead screw motor to drive the lead screw to rotate to control the axial movement of the lead screw slider along the lead screw, so that the elevating cylinder mounting bracket 43 is translated along the translation cross frame 42 to the position directly above the tray 13. Then control the telescopic rod of the elevating cylinder 44 to extend downward, and then drive the suction cup bracket 45 to move downward, so that the suction cup below the suction cup bracket 45 contacts the sewn fabric on the tray 13, so that the suction cup can be controlled to adsorb the sewn fabric. Then control the telescopic rod of the elevating cylinder 44 to retract to the initial position, and then control the lead screw motor to reverse, and then drive the lead screw slider to move axially in the reverse direction along the lead screw, so that the sewn fabric can be translated along the translation cross frame 42 to the position corresponding to the next work station, and then control the suction cup to release the fabric.

[0048] In this embodiment, both the elevating cylinder 44 and the suction cup adopt well-known technical solutions in the prior art, which are already understood by those skilled in the art and will not be elaborated here.

[0049] Embodiment Six, as a further preferred solution of Embodiment One, placing grooves are formed on four sides of the rotary worktable 1, the tray 13 is placed in the placing grooves, positioning holes are formed on the surface of the tray 13, positioning pins and fixing columns are respectively arranged on the sides of the placing grooves, the positioning pins are matched with the positioning holes, a semi-circular locking block 16 is rotatably connected to the fixing column, and the semi-circular locking block 16 is in movable contact with the side of the tray 13.

[0050] Therefore, when installing the tray 13, the tray 13 can be directly placed into the placing grooves corresponding to the four sides of the rotary worktable 1, and the limiting effect on the tray 13 can be achieved through the matching of the positioning pins and the positioning holes. Then, by rotating the semi-circular locking block 16, the semi-circular locking block 16 is pressed onto the upper surface of the tray 13, so as to realize the installation and fixation of the tray 13. For different fabric sewing requirements, different trays 13 can be replaced as needed, and the convenience and quickness of the whole replacement process are effectively ensured, thereby realizing the diversity of sewing samples.

[0051] In the present utility model, a controller can be set, and the signal output end of the controller is respectively connected to the signal input ends of the rotary motor 12, the manipulator 21, the sewing head assembly 31, the pneumatic scissors, the telescopic cylinder 154, the X-axis lead screw slide 32, the Y-axis lead screw slide 33, the lead screw motor, the lifting cylinder 44 and the suction cup. Thus, the rotary motor 12, the manipulator 21, the sewing head assembly 31, the pneumatic scissors, the telescopic cylinder 154, the X-axis lead screw slide 32, the Y-axis lead screw slide 33, the lead screw motor, the lifting cylinder 44 and the suction cup can be driven and controlled through the control chip in the controller to achieve the effect of automatic control.

[0052] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. An automatic sewing mechanism for an intelligent sewing workstation, characterized in that: It comprises a rotating worktable (1), a material unloading worktable (2) is arranged on the front side of the rotating worktable (1), a sewing machine worktable (3) is arranged on the right side of the rotating worktable (1), and a transfer mechanism (4) is installed at the rear edge of the rotating worktable (1); A rotating plate (11) is rotatably connected above the rotating worktable (1) via a rotating bearing, a rotating motor (12) is installed inside the rotating worktable (1), and the driving shaft of the rotating motor (12) is transmission-connected to the rotating plate (11); trays (13) are installed on the four sides of the rotating plate (11) in a centrally symmetrical manner, a support column (14) is provided inside the rotating worktable (1), a through hole is opened on the surface of the rotating plate (11), the upper end of the support column (14) passes through the through hole and is installed with a material pressing tool (15), and the material pressing end of the material pressing tool (15) corresponds to the upper surface of the tray (13) on the right side of the rotating plate (11); A manipulator (21) is arranged on the material discharging workbench (2), a material tray (22) is arranged on the upper surface of the material discharging workbench (2), the upper surface of the material tray (22) is used to place fabric, and the manipulator (21) is used to grab the fabric on the upper surface of the material tray (22) and transfer it to the tray (13) on the front side of the rotating plate (11); A horizontal two-dimensional moving mechanism is installed on the upper surface of the sewing machine workbench (3), a sewing machine head assembly (31) is installed on the horizontal two-dimensional moving mechanism, and the sewing end of the sewing machine head assembly (31) corresponds to the tray (13) on the right side of the rotating plate (11) in the upper and lower directions; The moving end of the transfer mechanism (4) corresponds to the tray (13) on the rear side of the rotating plate (11) in upper and lower positions.

2. The automatic sewing mechanism for an intelligent sewing workstation according to claim 1, characterized in that: The material pressing tool (15) comprises a mounting plate (151), wherein the mounting plate (151) is fixedly mounted on the upper end of the support column (14), one side of the mounting plate (151) is connected to a rotating plate (152) via a hinge, and the other side of the mounting plate (151) is fixedly mounted to a supporting plate (153), the upper part of the supporting plate (153) is connected to one end of a telescopic cylinder (154) via a hinge seat, the other end of the telescopic cylinder (154) is connected to the upper surface of the rotating plate (152) via a hinge seat, the lower part of the end of the rotating plate (152) away from the hinge is connected to a pressing plate (155) via a connecting piece, and the front end of the pressing plate (155) is connected to a sewing template (1510) via bolts, and the sewing template (1510) corresponds to the tray (13) up and down.

3. The automatic sewing mechanism for an intelligent sewing workstation according to claim 2, characterized in that: The connecting member comprises a connecting seat (156), wherein the connecting seat (156) is fixedly mounted on a pressure plate (155), a connecting block (157) is connected above the connecting seat (156), a locking stud (158) is arranged above the connecting block (157), and the locking stud (158) passes through the rotating plate (152) and is threadedly connected to a locking handle (159).

4. The automatic sewing mechanism for an intelligent sewing workstation according to claim 1, characterized in that: The horizontal two-dimensional moving mechanism comprises an X-axis screw slide (32), the X-axis screw slide (32) is fixedly mounted on the upper surface of a sewing machine worktable (3), a Y-axis screw slide (33) is slidably connected above the X-axis screw slide (32) via a screw slider, a moving seat (34) is slidably connected above the Y-axis screw slide (33) via a screw slider, and the sewing machine head assembly (31) is mounted on the upper surface of the moving seat (34).

5. The automatic sewing mechanism for an intelligent sewing workstation according to claim 1, characterized in that: The transfer mechanism (4) comprises a column (41), a translation cross frame (42) is installed above the column (41), a screw is installed on the translation cross frame (42) through a bearing seat, one end of the screw is transmission-connected to the driving end of the screw motor, a screw slider is connected to the surface of the screw through a thread, a lifting cylinder mounting frame (43) is fixedly installed on the screw slider, a lifting cylinder (44) is installed on the side of the lifting cylinder mounting frame (43), the lower part of the lifting cylinder (44) is connected to a suction cup frame (45) through a telescopic rod, and a suction cup is arranged below the suction cup frame (45).

6. The automatic sewing mechanism for an intelligent sewing workstation according to claim 1, characterized in that: The four sides of the rotating workbench (1) are provided with placement slots, the tray (13) is placed in the placement slots, the surface of the tray (13) is provided with positioning holes, the sides of the placement slots are respectively provided with positioning pins and fixing columns, the positioning pins match the positioning holes, and the fixing columns are rotatably connected with semicircular locking blocks (16), and the semicircular locking blocks (16) are in active contact with the sides of the tray (13).

Images