Semi-automatic anode hanging equipment

Abstract

The utility model discloses semi-automatic anode hanging equipment which comprises a placing seat and a branch hanging seat, a translation seat is arranged above the placing seat, a vacuum suction and release device is mounted on the translation seat, the branch hanging seat is provided with a placing structure, a fixing structure is arranged on the placing structure, a lifting seat is arranged above the branch hanging seat, and a stacking block and a pressing column are arranged on the front side face of the lifting seat. A plurality of stacking blocks are arranged between the two adjacent stacking blocks, a placing piece on which the side edge of a card plate of a card support is stacked is arranged between the two adjacent stacking blocks, the distance between the two adjacent placing pieces is larger than the aperture of a signal hole of the card support, the pressing columns are horizontally arranged in the front-back direction, and the distance between the two adjacent pressing columns is smaller than the distance between the two adjacent stacking blocks. Compared with the prior art, the card support is hung on the hanging strip through mechanical automation operation, excessive manual participation is not needed, the working efficiency is greatly improved, workers do not need to operate during hanging, the problem that the hanging strip scratches work is solved, and hanging operation is safe.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of mobile phone accessory processing, especially to semi-automatic anode upper hanging equipment. BACKGROUND

[0002] It is known that the SIM card of the existing smart phone is installed on the side of the mobile phone frame through a card holder, so that the mobile phone does not need to be powered off and the battery is taken out when the SIM card is taken in, which greatly facilitates the installation and replacement of the SIM card. The existing card holder is generally a metal part, which has a card plate for placing the SIM card horizontally and a side stand plate arranged vertically with the card plate. The card plate is provided with a card slot for placing the SIM card, and the card plate is provided with a signal hole for exposing the chip of the SIM card within the range corresponding to the card slot. The card holder needs to be anodized during processing. Workers need to place the card holder on the hanging branch one by one during anodizing. The structure of the hanging branch is a thin plate. The two sides of the thin plate in the length direction are integrally formed into a plurality of hanging strips arranged along the length direction of the thin plate. The hanging strip is composed of two oppositely spaced clamping arms. The opposite sides of the two clamping arms are arc-shaped. The distance between the two clamping arms close to the thin plate is smaller than the distance between the two clamping arms away from the thin plate. In this way, the worker pinches the two hanging strips with his hand when placing the card holder, the distance between the two hanging strips becomes smaller, and the end of the two hanging strips away from the thin plate can be inserted into the signal hole of the card holder. Then release the two hanging strips, the two hanging strips are separated away from each other, the card holder is clamped on the two hanging strips, and the installation of the card holder is realized. However, there are at least 20 hanging strips on each side of a hanging branch, the distance between the hanging strips is small, and the end of the hanging strip away from the thin plate is a sharp structure. In this way, the worker is easily scratched by the hanging strip when manually taking and placing the card holder, and the work efficiency of manually operating the card holder is low.

[0003] Therefore, the present inventors have conducted in-depth research on the above problems, and thus the present application is produced. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a kind of semi-automatic anode upper hanging equipment, to solve the problem of low work efficiency and easy injury of staff when the existing card holder is manually operated on anode operation.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The lifting mechanism is a lifting mechanism that can lift and lower the lifting mechanism, and the lifting mechanism is a lifting mechanism that can lift and lower the lifting mechanism, and the lifting mechanism is a lifting mechanism that can lift and lower the lifting mechanism.

[0007] It also includes a lower base plate, and the above-mentioned placement seat is a placement plate arranged horizontally. The placement plate is suspended above the lower base plate, and support feet are erected at the four corners of the bottom surface of the above-mentioned placement plate. The lower ends of the above-mentioned support feet are installed on the lower base plate, and the top of the above-mentioned placement plate is protruding upward with a positioning column that can extend into the card tray placement plate.

[0008] The lower base plate is provided with a mounting stand extending in the front-to-back direction and located outside the left or right side of the placement plate. The translation seat is a translation bar arranged horizontally in the left-right direction. One end of the translation bar is located above the mounting stand and slides with the translation bar.

[0009] The above-mentioned vacuum suction and release device has a suction nozzle seat and a vacuum suction nozzle. The above-mentioned suction nozzle seat is a strip-shaped block arranged horizontally along the left and right directions. The above-mentioned suction nozzle seat is installed on the translation seat in a manner that it can be lifted and lowered. The bottom surface of the above-mentioned suction nozzle seat is concavely provided with a strip groove extending along the left and right directions. The above-mentioned vacuum suction nozzle is correspondingly a strip structure extending along the left and right directions. The above-mentioned vacuum suction nozzle is fixed in the strip groove, and the above-mentioned suction nozzle seat is provided with an air duct with one end communicating with the strip groove and the other end passing through the outside of the suction nozzle seat corresponding to each strip groove. The above-mentioned vacuum suction nozzle is provided with a plurality of suction and release air holes arranged at intervals along the left and right directions.

[0010] A handle for pulling the nozzle seat is installed on the nozzle seat.

[0011] The hanging branch seat has left and right opposite side vertical plates and an upper top plate above the two side vertical plates, the top surface of the upper top plate is vertically provided with a plurality of close-to-blocks for vertically attaching the thin plates and arranged along the left and right directions, the close-to-blocks are below the stacking blocks, the top surface of the close-to-blocks is convexly provided with an upper limiting block extending forward and capable of pressing on the thin plate, the top surface of the upper top plate is horizontally provided with a plurality of support strips extending along the front and back directions and capable of supporting the thin plates, the support strips are arranged along the left and right directions and have the support strips between the two close-to-blocks, the top surface of each support strip is provided with a positioning structure matched with the thin plate, and each support strip is commonly provided with a clamping strip for matching the thin plate with the close-to-blocks, the close-to-blocks and the support strips form the placement structure, and the upper limiting block, the positioning structure and the clamping strip form the fixing structure.

[0012] The bottom plate is fixedly installed between the two side vertical plates and has a lifting cylinder below the upper top plate, the output end of the lifting cylinder is upwardly arranged, and the output end of the lifting cylinder is provided with a connecting block upwardly movably penetrating through the upper top plate, and the connecting block is locked with the lifting seat.

[0013] The top surface of the lifting seat is downwardly concave at the front side and has an installation recess slot extending to the outside of the front side surface of the lifting seat, the installation recess slot is a strip-shaped slot extending along the left and right directions, the installation recess slot is provided with a strip-shaped plate extending along the left and right directions, the strip-shaped plate is provided with bolt holes extending along the front and back directions, the strip-shaped plate is locked with the lifting seat through the bolts penetrating through the bolt holes, the front side surface of the strip-shaped plate is convexly provided with a strip-shaped block extending along the front and back directions and extending out of the installation recess slot, the strip-shaped block is the stacking block, the opposite opposite surfaces of the two strip-shaped blocks are convexly provided with side tabs with top surfaces lower than the top surface of the stacking block, and the strip-shaped plate is provided with front tabs with top surfaces on the same plane as the top surfaces of the side tabs of the two stacking blocks, the front tabs and the two side tabs are integrally formed, and the side tabs are the placement tabs.

[0014] The pressing column is a cylindrical rod extending along the front and back directions.

[0015] After adopting the above technical solution, the semi-automatic anode hanging equipment of the utility model is put into operation. The card tray placing plate with the card tray placed is placed on the placing seat, and the hanging branch is placed on the hanging branch seat and fixed. At this time, the upper parts of the two clamping arms of the hanging strip on the hanging branch are clamped between the two pressing columns and fall between the two placing pieces. Then, the translation seat is manually moved to make the vacuum suction and placement device be directly below each card tray arranged in a row on the card tray placing plate. The vacuum suction and placement device descends and contacts the card tray, and the vacuum is started to suck the card tray. Then, the vacuum suction and placement device The card tray is lifted up and then the translation seat is moved horizontally to the top of the lifting seat. The card tray on the vacuum suction and placement device is between two adjacent stacking blocks. The vacuum suction and placement device is then lowered so that the two sides of the card tray card plate are stacked on two adjacent placement pieces. The upper ends of the two clamping arms of the hanging branch fall into the signal hole of the card tray. Finally, the lifting seat moves down. As the lifting seat moves down, the two clamping arms gradually fall into the signal hole of the card tray, and the downward movement of the clamping column causes the two clamping arms to gradually release back to back and be clamped at the edge of the hole of the card tray signal hole, thus realizing the hanging of the card tray on the hanging bar. Compared with the existing technology, the hanging of the card tray on the hanging bar adopts mechanical automation operation, which does not require excessive human participation, greatly improving work efficiency, and workers do not need to operate during hanging, avoiding the problem of the hanging bar scratching the work, and the hanging operation is safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Fig. 1 It is a three-dimensional diagram of the utility model;

[0017] Fig. 2 It is a structural diagram of the utility model;

[0018] Fig. 3 This is a schematic diagram of the structure of the present invention with the clamping strip omitted. DETAILED DESCRIPTION

[0019] In order to further explain the technical solution of the present invention, it is described in detail below with reference to the accompanying drawings.

[0020] The semi-automatic anode hanging device of the utility model is as follows: Figs. 1-3 As shown, it includes a placement seat for the card holder placement plate 100 to be placed thereon, a hanging branch seat for the hanging branch 200 to be placed, and a lower base plate 1. The placement seat and the hanging branch seat are arranged side by side horizontally, with the horizontal arrangement direction of the placement seat and the hanging branch seat as the front-to-back direction. The placement seat is a placement plate 2 arranged flatly, and the placement plate 2 is suspended above the lower base plate 1, and supporting feet 21 are erected at the four corners of the bottom surface of the placement plate 2, and the lower ends of the supporting feet are installed on the lower base plate 1. The top of the above-mentioned placement plate 2 is protruded upward with a positioning column 22 that can be extended into the card holder placement plate 100, and the card holder placement plate 100 is provided with a positioning hole at the corresponding position, and the card holder placement plate 100 is fixed in the correct position by the mutual engagement of the positioning column 22 and the positioning hole to prevent it from sliding.

[0021] The upper portion of the placing seat is provided with a translating seat 3 which can translate forward and backward above the hanging branch seat. Specifically, the lower bottom plate 1 is provided with a mounting vertical seat 11 which extends along the front and back direction and is located outside the left side of the placing plate. The translating seat 3 is a translating strip which lies along the left and right direction. The left end of the translating strip is above the mounting vertical seat 11 and is in sliding cooperation with the translating strip. The top surface of the mounting vertical seat 11 is locked with a rail strip 111 which lies along the front and back direction. The bottom surface of the left end of the translating strip is locked with a sliding block 31 which is slidingly mounted on the rail strip. The sliding cooperation between the sliding block 31 and the rail strip 111 enables the translating seat 3 to manually translate forward and backward. In the present application, the mounting vertical seat and the sliding block can also be arranged on the right side.

[0022] The translating seat 3 is provided with a vacuum suction and release device which can lift and lower and can suction and release the card holder. The vacuum suction and release device is provided with a suction nozzle seat 41 and a vacuum suction nozzle 42. The suction nozzle seat 41 is a strip-shaped block which lies along the left and right direction. The suction nozzle seat 41 is mounted on the translating seat 3 in a manner that it can lift and lower. Specifically, the top surface of the translating seat 3 is locked with two air cylinders 32 which are arranged in an interval. The piston rods of the air cylinders 32 are arranged upward. The top surface of the suction nozzle seat 41 is locked with L-shaped mounting plates 411 which correspond to the two air cylinders. The piston rods of the air cylinders 32 are fixedly connected with the L-shaped mounting plates 411. When the piston rods are extended, the suction nozzle seat 41 can be lifted and lowered. The bottom surface of the suction nozzle seat 41 is concavely provided with strip-shaped grooves (not shown in the figure) which extend along the left and right direction. The three strip-shaped grooves are arranged in an interval. Each strip-shaped groove is provided with a vacuum suction nozzle 42. The vacuum suction nozzle 42 is in a strip-shaped structure which extends along the left and right direction. The vacuum suction nozzle 42 is fixed in the strip-shaped groove. The suction nozzle seat 41 is provided with air passages which correspond to the strip-shaped grooves and extend through the suction nozzle seat. The suction nozzle seat 41 is provided with a handle 412 which can pull the suction nozzle seat 41. When working, the translating seat 3 can be pulled forward and backward by pulling the handle 412. In the present application, the vacuum suction and release principle of the vacuum suction nozzle and the suction nozzle seat is the prior art.

[0023] The hanging branch seat has a placing structure for the thin plate of the hanging branch 200 to be placed vertically along the left-right direction, and a fixing structure is arranged on the placing structure to fix the thin plate. Specifically, the hanging branch seat has left and right side vertical plates 51 and an upper top plate 52 above the two side vertical plates. The top surface of the upper top plate 52 is vertically provided with a plurality of close-to-blocks 521 for the vertical placement of the thin plate, which are arranged along the left-right direction at intervals. The close-to-blocks 521 are rectangular blocks arranged vertically. The top surface of the close-to-blocks 521 is provided with an upper limiting block 521a extending forward and capable of pressing on the thin plate. The top surface of the upper top plate 52 is horizontally provided with a plurality of support bars 522 extending along the front-back direction and capable of pressing the thin plate thereon. The support bars 522 are arranged along the left-right direction at intervals, and one support bar 522 is arranged between the two close-to-blocks 521. The top surface of each support bar 522 is provided with a positioning structure matched with the thin plate, that is, the top surface of the support bar 522 is a convex arc surface extending upward. The upper and lower side surfaces of the thin plate of the hanging branch 200 are correspondingly provided with concave arc grooves matched with the convex arc surface at the positions of the support bars 522. The positioning structure with the concave-convex matching structure plays a guiding role when the hanging branch 200 is moved forward to the close-to-blocks 521 and is closely matched with the close-to-blocks 521. Each support bar 522 is commonly provided with a clamping bar 53 closely matched with the thin plate and the close-to-blocks 521. The close-to-blocks 521 and the support bars 522 form the placing structure, and the upper limiting block 521a, the positioning structure and the clamping bar 53 form the fixing structure. In application, the hanging branch 200 is directly moved backward to the close-to-blocks and is matched with the close-to-blocks. At this time, the thin plate of the hanging branch 200 is clamped between the upper limiting block 431 and the support bar 522. Then, the clamping bar 53 is used to prevent the thin plate of the hanging branch 200 from tilting forward. Then, the clamping bar 53 is pulled out forward, and the hanging branch 200 can be moved out of the hanging branch seat. At this time, the removed hanging branch 200 is turned over by 180 degrees and is placed on the hanging branch seat again.

[0024] The upper part of the hanging branch seat is provided with a lifting seat 6 capable of moving up and down. Specifically, the lifting seat 6 is a strip-shaped flat plate extending along the left-right direction. The bottom plate 1 is fixedly installed between the two side vertical plates 41 and is provided with a lifting cylinder 71 below the upper top plate 52. The output end of the lifting cylinder 71 is arranged upward. The output end of the lifting cylinder 71 is provided with a connecting block (not shown in the figure) which is movably arranged upward through the upper top plate. The connecting block is locked with the lifting seat 6. The front side surface of the lifting seat 6 is provided with a plurality of stacking blocks 61 arranged along the left-right direction at intervals and a pressing column 62 correspondingly arranged below each stacking block. The adjacent two stacking blocks 61 are provided with a placing piece 611 for the side edges of the clamping bracket to be stacked thereon. The close-to-blocks 521 are arranged below the stacking blocks 61. The distance between the adjacent two placing pieces 611 is greater than the hole diameter of the clamping bracket signal hole. The pressing column 62 is horizontally arranged along the front-back direction and has a cylindrical structure. The distance between the adjacent two pressing columns 62 is smaller than the distance between the adjacent two stacking blocks 61.

[0025] The top surface of the lifting seat 6 is concave downward in front side, and a mounting recess (not shown in the figure) is formed to the outside of the front side surface of the lifting seat 6, the mounting recess is a strip-shaped slot extending along the left-right direction, a strip-shaped plate 63 extending along the left-right direction is arranged in the mounting recess, bolt holes extending along the front-rear direction are formed on the strip-shaped plate 63, the strip-shaped plate 63 is locked together by bolts passing through the bolt holes and locking with the lifting seat 6, the front side surface of the strip-shaped plate 63 is convex forward, and a strip-shaped block extending along the front-rear direction and extending out of the mounting recess is arranged on the front side surface, the strip-shaped block is the stacking block 61, side tabs with top surfaces lower than the top surface of the stacking block are arranged on the opposite opposite surfaces of the two adjacent strip-shaped blocks, and the strip-shaped plate is arranged on the front tabs with the top surfaces of the side tabs and the top surfaces of the two stacking blocks on the same plane, the front tabs and the two side tabs are integrally formed, and the side tabs are the placing tabs.

[0026] The semi-automatic anode hanging device of the utility model is characterized in that positioning holes are arranged in the card holder placing disc 100 corresponding to the positioning columns, so that when processing, the card holder placing disc 100 with the card holder placed is placed on the placing seat, the positioning holes are aligned with the positioning columns 22, the card holder placing disc 100 is fixed and placed on the placing seat 2, then the empty hanging branch 200 is placed on the hanging branch seat by moving from front to back, the clamping strip 53 is placed on each supporting strip 522, at this time, the upper parts of the two clamping arms of the hanging strip on the hanging branch 200 are clamped into the two pressing columns 61 and fall into the two placing tabs 611, then the moving seat 3 is manually moved, the vacuum suction nozzle is arranged below the first row of card holders on the card holder placing disc 100, the cylinder 32 is started, the suction nozzle seat is lowered, the vacuum suction nozzle is in contact with the card holder, the card holder is sucked by the vacuum suction nozzle, then the cylinder 32 drives the suction nozzle seat to rise, the card holder is sucked upward, the moving seat 3 is moved forward, the suction nozzle seat is arranged above the lifting seat, the card holder on the suction nozzle seat is aligned with the two adjacent stacking blocks 61, the suction nozzle seat is lowered, the card holder is placed on the placing tabs 611 of the two stacking blocks, the vacuum suction nozzle is released, and the card holder is released on the placing tabs, at this time, the upper ends of the two clamping arms of the hanging branch fall into the signal hole range of the card holder, the suction nozzle seat is moved upward and backward to the placing seat to perform the next suction cycle, finally, the lifting cylinder 71 drives the lifting seat 6 to move downward, with the movement of the lifting seat 6, the clamping arms of the two hanging branches fall into the signal hole of the card holder, and the downward movement of the pressing column 62 makes the two clamping arms of the hanging strip gradually release and be clamped at the signal hole of the card holder, so that the card holder is hung on the hanging strip, and the card holder on each hanging strip on one side of the hanging branch is hung, and the card holder on each hanging strip on the other side of the hanging branch is hung in the same way, the clamping strip 53 is removed forward, the hanging branch is removed from the hanging branch seat, then the hanging branch is turned over by 180 degrees and is reinstalled on the hanging branch seat, and the hanging operation of the hanging strip is repeated to realize the hanging of the other side of the hanging branch. Compared with the prior art, the card holder is hung on the hanging strip by mechanical automation, manual intervention is not needed, the working efficiency is greatly improved, the worker does not need to operate during the hanging operation, the problem that the hanging strip is scratched is avoided, and the hanging operation is safe.

[0027] The product form of the present application is not limited to the drawings and examples, and any appropriate changes or modifications of similar ideas should be considered as falling within the scope of the present application.

Claims

1. A semi-automatic anode hanging apparatus, characterized by: The placing seat and the hanging branch seat are arranged transversely and side by side, the transverse arrangement direction of the placing seat and the hanging branch seat is the front-back direction, the upper portion of the placing seat is provided with a translation seat which can be translated to the upper portion of the hanging branch seat in the front-back direction, the translation seat is provided with a vacuum suction and placing device which can be lifted up and down and can suction and place the card holder, the hanging branch seat is provided with a placing structure in which the thin plate for hanging branches is vertically erected and horizontally arranged in the left-right direction, the placing structure is provided with a fixing structure for fixing the thin plate, the upper portion of the hanging branch seat is provided with a lifting seat which can be lifted up and down, the front side of the lifting seat is provided with a plurality of stacking blocks which are arranged in the left-right direction and a plurality of pressing columns which are correspondingly arranged below the stacking blocks, the placing pieces are arranged between the adjacent two stacking blocks and the side edges of the card holder, the distance between the adjacent two placing pieces is greater than the hole diameter of the signal hole of the card holder, the pressing columns are arranged horizontally in the front-back direction, and the distance between the adjacent two pressing columns is smaller than the distance between the adjacent two stacking blocks.

2. The semi-automatic anode hanging apparatus according to claim 1, characterized in that: The placing seat is a placing plate which is arranged horizontally, the placing plate is suspended above the lower bottom plate, and the bottom surface of the placing plate is vertically provided with supporting feet at the four corners, the lower end of the supporting feet is installed on the lower bottom plate, and the top surface of the placing plate is vertically provided with a positioning column which can be inserted into the card holder placing disc.

3. The semi-automatic anode hanging apparatus according to claim 2, characterized in that: The lower bottom plate is installed with an installation stand which extends in the front-back direction and is located outside the left side or the right side of the placing plate, the translation seat is a translation strip which is arranged horizontally in the left-right direction, and one end of the translation strip is located above the installation stand and is in sliding cooperation with the translation strip.

4. The semi-automatic anode hanging apparatus according to claim 1 or 3, characterized in that: The vacuum suction and placing device is provided with a suction nozzle seat and a vacuum suction nozzle, the suction nozzle seat is a strip-shaped block which is arranged horizontally in the left-right direction, the suction nozzle seat is installed on the translation seat in a manner that can be lifted up and down, the bottom surface of the suction nozzle seat is concavely provided with a strip-shaped groove which extends in the left-right direction, the vacuum suction nozzle is correspondingly provided with a strip-shaped structure which extends in the left-right direction, the vacuum suction nozzle is fixed in the strip-shaped groove, and the suction nozzle seat is provided with a gas passage at one end of each strip-shaped groove which communicates with the strip-shaped groove and at the other end which passes through the suction nozzle seat, and the vacuum suction nozzle is provided with a plurality of suction and placing holes which are arranged in the left-right direction.

5. The semi-automatic anode hanging apparatus according to claim 4, characterized in that: The suction nozzle seat is installed with a pulling handle which can pull the suction nozzle seat.

6. The semi-automatic anode hanging apparatus according to claim 2, characterized in that: The hanging branch seat is provided with side vertical plates which are opposite to each other and an upper top plate which is located above the two side vertical plates, the top surface of the upper top plate is vertically provided with a plurality of close-to-blocks which are arranged in the left-right direction and are used for vertically attaching the thin plate, the close-to-blocks are located below the stacking blocks, the top surface of the close-to-blocks is vertically provided with upper limiting blocks which extend forward and can press on the thin plate, the top surface of the upper top plate is horizontally provided with a plurality of supporting strips which extend in the front-back direction and are used for pressing and placing the thin plate, the supporting strips are arranged in the left-right direction, the close-to-blocks are arranged between the two supporting strips, the distance between the adjacent two close-to-blocks is greater than the hole diameter of the signal hole of the card holder, the pressing columns are arranged horizontally in the front-back direction, and the distance between the adjacent two pressing columns is smaller than the distance between the adjacent two stacking blocks.

7. The semi-automatic anode hanging apparatus according to claim 6, characterized in that: The bottom plate is fixedly installed between the two side plates and has a lifting cylinder below the upper top plate. The output end of the lifting cylinder is upwardly arranged. A connecting block is installed on the output end of the lifting cylinder and passes through the upper top plate upwardly. The connecting block is locked with the lifting seat.

8. The semi-automatic anode hanging apparatus according to claim 2, characterized in that: The top surface of the lifting seat is downwardly concave at the front side and has an installation recess slot extending to the outside of the front surface of the lifting seat. The installation recess slot is a strip-shaped slot extending along the left-right direction. A strip-shaped plate extending along the left-right direction is arranged in the installation recess slot. A bolt hole extending along the front-back direction is arranged on the strip-shaped plate. The strip-shaped plate is locked with the lifting seat by bolts passing through the bolt holes. The front surface of the strip-shaped plate is forwardly convex and has a strip-shaped block extending along the front-back direction and extending out of the installation recess slot. The strip-shaped block is the stacking block. The opposite opposite surfaces of the two strip-shaped blocks are convexly provided with side tabs whose top surfaces are lower than the top surface of the stacking block. The strip-shaped plate is provided with front tabs whose top surfaces are on the same plane as the top surfaces of the side tabs of the two stacking blocks. The front tabs and the two side tabs are integrally formed. The side tabs are the placing tabs.

9. The semi-automatic anode hanging apparatus according to claim 2, characterized in that: The pressing column is a cylindrical rod lying along the front-back direction.

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