Telescopic and foldable lower die mechanism and patch pocket machine

Abstract

The utility model relates to a lower die mechanism capable of being telescopically folded and a pocket patching machine. The lower die mechanism capable of being telescopically folded comprises a base; the lower mold plate is of a split deformation structure, has an unfolded working state and a relatively narrowed state and comprises a plurality of unit plates, and the unit plates are movably matched with each other relative to the base; and the driving mechanism is mounted on the base, is linked with each unit plate and is used for driving the lower template to switch the state. According to the lower die mechanism, the split deformable lower die plate is adopted, the width can be adaptively changed according to different machining stages, the lower die plate can be pulled out from bag-shaped cloth with a narrowed opening, all unit plates are movably arranged, the movement stroke is more reasonable, and the narrowing range adaptability is higher.

Description

Technical Field

[0001] The present application relates to the technical field of sewing equipment, and particularly relates to a retractable and foldable lower die mechanism and a pocket attaching machine. Background Art

[0002] The pocket attaching machine is mainly applied to the sewing operation of pockets, and can complete flat sewing and bartacking at one time. It is suitable for the sewing of various back pockets of jeans, shirt pockets, and the sewing of other irregularly shaped parts in garment processing.

[0003] During the working process of the pocket attaching machine, first, a bag-shaped fabric is laid on the lower template, and then the upper die mechanism in the hemming mechanism cooperates with the lower template. An electromagnet is provided in the upper die mechanism, and the electromagnet can attract the lower template to clamp the bag-shaped fabric. The hemming knives in the hemming mechanism are inserted under both sides of the bag-shaped fabric to complete the hemming action of the bag-shaped fabric.

[0004] When the hemming mechanism resets, the lower template needs to be withdrawn from the lower part of the bag-shaped fabric. When the pocket is wider at the bottom and narrower at the top, due to the smaller upper opening, the lower template is blocked by the hemming part and cannot be withdrawn after being inserted and completing the hemming action.

[0005] In addition, with the improvement of the requirements for garment quality, a clean finish at the edge is required. The existing process is to first manually fold the two sides (adjacent to the bag mouth part) of the bag-shaped fabric inward for the first time, then fold the upper mouth part of the bag-shaped fabric inward for the second time, and then sew the upper mouth of the bag-shaped fabric. Therefore, there is no frayed edge on the upper hemming of the pocket. When the other parts of the bag-shaped fabric away from the bag mouth part are hemmed by the pocket attaching machine, due to the combined action of the upper hemming and the side hemming, the lower template cannot be smoothly withdrawn. Therefore, for pockets that are wider at the bottom and narrower at the top and pocket attaching sewing with a clean finish at the inner edge, the existing technology generally adopts manual sewing, resulting in reduced efficiency and higher labor costs. Summary of the Utility Model

[0006] The present application provides a lower die mechanism for a pocket attaching machine, which can be applied to pockets that are wider at the bottom and narrower at the top and the requirement of a clean finish at the inner edge, and can further improve production efficiency.

[0007] A retractable and foldable lower die mechanism of the present application includes:

[0008] A base;

[0009] A lower template, which adopts a split deformation structure and has an unfolded working state and a relatively narrowed state. The lower template includes a plurality of unit plates, and each unit plate is movably matched with the base;

[0010] A driving mechanism, which is installed on the base and is linked with each unit plate for driving the lower template to switch states.

[0011] The following also provides several optional methods, which are not additional limitations to the above overall solution, but merely further supplements or optimizations. On the premise of no technical or logical contradictions, each optional method can be combined with the above overall solution separately, or multiple optional methods can be combined with each other.

[0012] In one embodiment, the unit plate includes:

[0013] A middle plate that moves along a first direction;

[0014] Side plates, including a left plate and a right plate arranged on both sides of the middle plate along a second direction, and the left plate and the right plate move along the second direction;

[0015] The base has opposite front and rear sides, the first direction extends along the front and rear directions, and the second direction is perpendicular to the first direction.

[0016] In one embodiment, each of the unit plates is independently configured with the driving mechanism;

[0017] Or each of the unit plates shares the same set of the driving mechanism, and the left plate and the right plate move synchronously and in opposite directions.

[0018] In one embodiment, an elastic member acts between the base and the side plates to make the lower template tend to a narrowed state or a working state.

[0019] In one embodiment, in the working state of the lower template, the front edges of each of the unit plates are connected to each other;

[0020] In the narrowed state, the middle plate moves further closer to the base along the first direction, and the left plate and the right plate approach each other to surround the front side of the middle plate.

[0021] In one embodiment, respectively provided with avoidance areas on the opposite sides of the left plate and the right plate, and in the narrowed state, the front side of the middle plate is located in the avoidance area.

[0022] In one embodiment, the driving mechanism includes:

[0023] A cylinder, installed on the base, and the middle plate is connected to the piston rod of the cylinder;

[0024] Link rods, there are two link rods, one end of each link rod is hinged to the piston rod of the cylinder, and the other end is hinged to each side plate.

[0025] In one embodiment, a stroke adjusting member is provided on the piston rod of the cylinder, and the stroke adjusting member acts on the cylinder block to limit the retraction limit position of the piston rod.

[0026] In one embodiment, all unit plates are arranged coplanarly;

[0027] On the opposite sides of the left plate and the right plate, avoidance grooves are respectively provided for folding the edges of the bag-shaped fabric and inserting them therein.

[0028] The present application also provides a pocket attaching machine, including an upper die mechanism and a lower die mechanism that cooperate with each other to clamp the bag-shaped fabric to perform hemming. The lower die mechanism is the retractable and foldable lower die mechanism described in the present application;

[0029] The upper die mechanism is provided with multiple sets of force application components. Each set of force application components acts on a corresponding unit plate. Each set of force application components includes a suction member that keeps the unit plate in suction engagement with the upper die mechanism for clamping the bag-shaped fabric, and a pushing member that drives the unit plate to disengage from the upper die mechanism.

[0030] The lower die mechanism of the present application adopts a split and deformable lower template, which can adaptively change the width according to different processing stages, and can be withdrawn from the bag-shaped fabric with a narrowed mouth. Each unit plate is movably arranged, the movement stroke is more reasonable, and the narrowing amplitude has stronger adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic structural diagram of the lower die mechanism in an embodiment of the present application;

[0033] Figure 2 It is Figure 1 The schematic structural diagram of the lower die mechanism in which the top frame is omitted;

[0034] Figure 3 It is Figure 1 The sectional view taken along line A-A in ;

[0035] Figure 4 It is Figure 3 The partial enlarged view in ;

[0036] Figure 5 It is a schematic diagram of the lower template cooperating with the bag-shaped fabric with a wider lower part and a narrower upper part;

[0037] Figure 6 It is Figure 5 The schematic diagram when the lower template is withdrawn from the bag-shaped fabric in ;

[0038] Figure 7 It isFigure 1 Schematic structural diagram of the middle and lower die mechanism in a narrowed state;

[0039] Figure 8 For Figure 1 Schematic structural diagram of the cooperation between the middle and lower die mechanism and the upper die mechanism;

[0040] Figure 9 For Figure 8 Partial schematic diagram of the middle and lower die mechanism from a bottom-up view;

[0041] Figure 10 For Figure 8 Schematic structural diagram of the upper middle die mechanism.

[0042] The reference numerals of each component are as follows:

[0043] 100, base;

[0044] 110, bottom plate; 111, limiting member;

[0045] 120, top frame; 121, middle plate guide seat; 122, stop block; 123, limiting shaft; 124, elastic member; 125, side plate guide rail;

[0046] 200, lower template; 201, middle plate; 202, left plate; 203, right plate; 204, avoidance groove; 205, avoidance area;

[0047] 210, middle plate connecting seat; 211, middle plate guide rail;

[0048] 220, left plate connecting seat; 221, left plate guide seat; 222, card slot; 223, strip hole;

[0049] 230, right plate connecting seat; 231, right plate guide seat;

[0050] 240, transition plate; 241, clamping block;

[0051] 300, driving mechanism; 310, cylinder; 311, cylinder block; 312, piston rod; 313, joint; 314, stroke adjusting member; 320, connecting rod;

[0052] 400, upper die mechanism; 410, fixed seat; 420, upper female die; 430, suction member; 440, pushing member;

[0053] 500, bag-shaped fabric; 501, side hem; 502, bag mouth hem. Specific embodiments

[0054] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0055] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used in the specification of the present application are for illustrative purposes only and do not represent the only implementation manner.

[0056] In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0057] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first feature is in direct contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or only indicates that the first feature is at a higher horizontal height (or in a certain use state, or from a certain perspective of the drawing) than the second feature. The first feature being "below", "beneath", and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or only indicates that the first feature is at a lower horizontal height (or in a certain use state, or from a certain perspective of the drawing) than the second feature.

[0058] Unless otherwise defined, all technical and scientific terms used in the specification of the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more of the related listed items.

[0059] See Figures 1 to 4, An embodiment of the present application provides a retractable and foldable lower die mechanism, including a base 100. The base 100 is used to install other components and externally connect a power mechanism. When applied to a pocket-attaching machine, the base 100 can be lifted and / or horizontally moved under the drive of the power mechanism. The base 100 has opposite front and rear sides. Figure 1 In the first direction X extends along the front and rear directions, and the second direction Y is perpendicular to the first direction Y and both are horizontal directions.

[0060] The lower template 200 is entirely located on the front side of the base 100. The lower template 200 in this embodiment adopts a split deformation structure, that is, it includes a plurality of unit plates. Each unit plate is movably cooperated with the base relative to each other. The relative movement of the plurality of unit plates can change the width of the lower template 200 (the dimension along the second direction), facilitating the extraction of the mouth part of the bag-shaped fabric. The shape and number of the unit plates are not strictly limited. For example, there are 2 to 6 pieces. The lower template 200 has an unfolded working state and a relatively narrowed state. The lower template 200 supports the inner edge of the folded part of the bag-shaped fabric in the working state. When it is necessary to extract the lower template 200 to complete the folding, in order to avoid being blocked by the narrowed bag mouth or the hemming part, the relative movement of the plurality of unit plates causes the width of the lower template 200 to narrow. The driving mechanism 300 is installed on the base 100 and is linked with each unit plate to drive the lower template 200 to switch states.

[0061] In this embodiment, all the unit plates are movably cooperated with the base 100, such as sliding or rotational cooperation. They can switch states through a shorter stroke, making the overall structure of the lower die mechanism more compact. Moreover, it can also make the spatial arrangement of each unit plate more reasonable in the narrowed state.

[0062] Taking three unit plates as an example, in one embodiment, the unit plate includes:

[0063] The middle plate 201 is movable relative to the base 100 along the first direction;

[0064] The side plates include a left plate 202 and a right plate 203 arranged on both sides of the middle plate 201 along the second direction. The left plate 202 and the right plate 203 are movable relative to the base 100 along the second direction. The "left" and "right" here are only for convenience of description and are relative concepts. Any side can be the left side, and the other side is the right side.

[0065] The left plate 202 and the right plate 203 can have a movement component in the second direction relative to the base 100. In a preferred embodiment, the left plate 202 and the right plate 203 only move along the second direction relative to the base, that is, there is no movement component in other directions. It can be more efficient when switching to the narrowed state relative to other movement directions, and the overall lower die mechanism can obtain a smaller size in the first direction, which is more conducive to optimizing the spatial arrangement of the equipment.

[0066] Each unit board can be independently configured with a driving mechanism or multiple unit boards can share the same set of driving mechanisms. Through linkage control or by setting a synchronization mechanism, the left board 202 and the right board 203 can achieve synchronous reverse movement and have the same movement stroke relative to the middle board 201 when switched to the narrowed state.

[0067] The middle board 201 moves in the first direction, further cooperating with the movement modes of the left board 202 and the right board 203, so that the three can be arranged in a staggered manner in the first direction when in the narrowed state. Especially in a preferred embodiment, the thickness of each unit board is not greater than 1.5 mm, and all unit boards are arranged coplanarly. The unit boards can avoid mutual interference through the shape matching with each other, and the overall width change can be achieved on the premise of being coplanar. The coplanar arrangement of all unit boards does not require them to have the same thickness, which can be understood as there is no mutual overlapping between them, and mutual interference during state switching can be avoided. In addition, after the bag-shaped fabric is folded, it may push up the left board 202 and the right board 203. Therefore, the middle board 201 can be slightly thicker (for example, 0.5 mm thicker) than the left board 202 and the right board 203 to compensate for this height difference.

[0068] In one embodiment, the base 100 includes a bottom plate 110 and a top frame 120. The rear sides of each unit board are respectively provided with connecting seats for cooperating with the driving mechanism 300. For example, a middle board connecting seat 210 is fixed to the rear side of the middle board 201, a middle board guide rail 211 is fixed on the middle board connecting seat 210, and a middle board guiding seat 121 slidably matched with the middle board guide rail 211 is fixed to the bottom side of the top frame 120 to guide the middle board 201 to move in the first direction.

[0069] A transition board 240 is fixed to the rear side of the left board 202, and then the left board connecting seat 220 is detachably connected via the transition board 240. A left board guiding seat 221 is fixed on the left board connecting seat 220, and a side board guide rail 125 slidably matched with the left board guiding seat 221 is fixed to the bottom side of the top frame 120 to guide the left board 202 to move in the second direction.

[0070] Similarly, a corresponding transition board is fixed to the rear side of the right board 203, and then the right board connecting seat 230 is detachably connected via the transition board. A right board guiding seat 231 is fixed on the right board connecting seat 230, and a side board guide rail slidably matched with the right board guiding seat 231 is fixed to the bottom side of the top frame 120 to guide the right board 203 to move in the second direction.

[0071] The positions of the guide rails and guiding seats in the above embodiments can also be interchanged, and the specific structure is not strictly limited, as long as at least sliding cooperation and mutual anti-disengagement can be achieved. For more stable movement, two sets of mutually cooperating guide rails and guiding seats can be provided for the same side board. In some embodiments, the guide rails and guiding seats corresponding to the left board 202 and the right board 203 can also extend integrally.

[0072] In one embodiment, taking the cooperation mode of the transition plate 240 and the left plate connector 220 as an example (similarly for the right side), the left plate connector 220 is provided with a card slot 222, and the transition plate 240 is provided with a card block 241 that cooperates with the card slot 222 for position registration when connecting to each other. The transition plate 240 and the connector can achieve quick disassembly, improving operation convenience and assembly efficiency.

[0073] For each connector, two sets or more of the cooperating card slots 222 and card blocks 241 can be provided, and each card block 241 can be further fixed to the corresponding connector in a manner convenient for disassembly.

[0074] For the convenience of adjustment, the left plate connector 220 is provided with a strip hole 223 and is fixed to the transition plate 240 through a fastener passing through the strip hole 223. The fastener can adjust its position along the strip hole 223, that is, the left plate 202 is adjustable in distance relative to the left plate connector 220 in the second direction, and is fastened and locked after adjustment. This is convenient for further registering the relative positions of the unit plates in the second direction during the assembly process.

[0075] Between each unit plate and the corresponding connector, and between each connector and the base 100, mutually cooperating adjustment structures can also be provided to adjust the positions of the unit plates in the height direction to ensure that the unit plates are coplanarly arranged.

[0076] In one embodiment, all the unit plates share the same set of driving mechanisms 300, and the driving mechanism 300 includes a cylinder 310 and a connecting rod 320.

[0077] The cylinder 310 includes a cylinder block 311 installed on the base 100 and a piston rod 312 slidably fitted in the cylinder block 311, and the middle plate connector 210 is connected to the piston rod 312 of the cylinder 310;

[0078] There are two connecting rods 320. One end of each connecting rod 320 is hinged to the piston rod 312 of the cylinder 310, and the other end is hinged to the left plate connector 220 or the right plate connector 230.

[0079] When the piston rod 312 moves, on the one hand, it directly drives the middle plate 201 to move in the first direction, and on the other hand, it also causes each side plate to move in the second direction through the commutation of the connecting rod 320.

[0080] In one embodiment, in order to accurately determine the limit position of the forward movement of the middle plate 201, a limiting member 111 is provided on the front side of the bottom plate 110, for example, in the form of a push rod with a threaded fit. When the middle plate 201 moves forward to the limit position, the middle plate connector 210 or the middle plate guide rail 211 abuts against the limiting member 111.

[0081] In one embodiment, in order to determine the lateral positions of the side plates in the narrowed state, a stroke adjusting member 314 is provided on the piston rod 312. The stroke adjusting member 314 is fixedly attached to the piston rod 312 with an adjustable position. When the piston rod 312 moves backward to the extreme position, the stroke adjusting member 314 abuts against the cylinder block 311 to limit the retraction extreme position of the piston rod 312.

[0082] In one embodiment, referring to Figure 3 、 Figure 4 , an elastic member 124 acts between the base 100 and the side plates, causing the lower template 200 to tend towards the narrowed state or the working state to provide a unidirectional pre-tightening force. In this embodiment, taking the tendency towards the narrowed state as an example (when the lower template 200 is in the working state, the elastic member 124 accumulates and stores energy), it can be ensured that when the lower template 200 retracts and disengages from the pocket-shaped fabric, it can quickly narrow to overcome the movement commutation resistance, and can further eliminate the position error caused by the guide rail clearance.

[0083] For the specific installation method of the elastic member 124, a stop block 122 can be fixed on the side of the top frame 120. The left plate connecting seat 220 (similarly for the right side) is provided with a mounting hole. The stop block 122 is fixed with a limiting shaft 123 extending into the mounting hole. The elastic member 124 can adopt a helical compression spring sleeved on the limiting shaft 123, with both ends respectively pressing against the stop block 122 and the left plate connecting seat 220 to assist the lower template 200 to narrow. Correspondingly, when the lower template 200 is in the working state, the left plate connecting seat 220 compresses the elastic member 124, and the elastic member 124 accumulates and stores energy accordingly.

[0084] To meet the requirement of no burrs on the rabbet, referring to Figure 2 , in one embodiment, relief grooves 204 are respectively provided on the opposite sides of the left plate 202 and the right plate 203. The relief grooves 204 roughly correspond to the bag mouth part. During operation, the two sides (adjacent to the bag mouth part) of the pocket-shaped fabric 500 can be first folded inwards to obtain side folds 501, then the upper mouth part of the pocket-shaped fabric 500 is folded inwards to obtain a bag mouth fold 502, and after sewing the upper mouth of the pocket-shaped fabric 500, it is sleeved onto the lower template 200, and the relief grooves 204 exactly correspond to and avoid the rabbet part. Then, it cooperates with the upper die mechanism to perform a folding operation on the front part of the pocket-shaped fabric 500. After folding, the lower template 200 switches to the narrowed state and disengages from the pocket-shaped fabric 500.

[0085] Combined with Figure 5 、 Figure 6 、 Figure 7, in the working state of the lower template 200, the front edges of the middle plate 201, the left plate 202, and the right plate 203 are connected to each other to form an outer contour of a continuously extending section, which generally corresponds to the bag-shaped fabric 500 with a narrowed mouth. A relatively large gap is left between the left plate 202 and the right plate 203 to provide a narrowing space. After the hemming is completed, since the mouth part of the bag-shaped fabric 500 is relatively narrow, the lower template 200 cannot be directly withdrawn. Each unit plate of the present application can move relative to each other to adapt to the switching of the lower template 200 to the narrowing state. The piston rod 312 moves backward, and directly drives the middle plate connecting seat 210 through the joint 313, so that the middle plate 201 further approaches the base 100 along the first direction. Both connecting rods 320 are rotationally engaged with the joint 313. Driven by the connecting rods 320, the left plate connecting seat 220 and the right plate connecting seat 230 approach each other synchronously along the second direction, so that the left plate 202 and the right plate 203 approach each other and surround the front side of the middle plate 201.

[0086] The front side of the middle plate 201 is T-shaped. In the working state, the horizontal part of the T-shape is connected to the front sides of the left plate 202 and the right plate 203. Avoidance areas 205 are respectively provided on the opposite sides of the left plate 202 and the right plate 203. In the narrowing state, the horizontal part of the T-shape moves along the first direction relative to the left plate 202 and the right plate 203 and is clamped in the avoidance areas 205, allowing the left plate 202 and the right plate 203 to move towards each other, and overall narrowing the lower template 200 to disengage from the bag-shaped fabric 500.

[0087] See Figures 8 to 10 , in an embodiment of the present application, a pocket-attaching machine is further provided, which includes an upper die mechanism 400 and a lower die mechanism that cooperate with each other to clamp the bag-shaped fabric to perform hemming. The lower die mechanism can be combined with the above embodiments and will not be elaborated here.

[0088] The upper die mechanism 400 includes a fixed seat 410 and an upper female die 420 installed on the fixed seat 410. The upper female die 420 is connected to the fixed seat 410 and moves with the fixed seat 410. The upper female die 420 has a die cavity for placing the bag-shaped fabric and the lower template 200. The die cavity is located on the side of the upper female die 420 facing away from the fixed seat 410.

[0089] The upper die mechanism 400 is provided with multiple sets of force-applying components. Each set of force-applying components acts on a corresponding unit plate. Specifically, there are three sets that can act on the middle plate 201, the left plate 202, and the right plate 203 respectively. Each set of force-applying components includes a suction member 430 that acts on the unit plate to keep each unit plate in suction engagement with the upper die mechanism 400 for clamping the bag-shaped fabric, and a pushing member 440 that drives the unit plate to disengage from the upper die mechanism 400. The suction force of the suction member 430 drives the lower template 200 into the die cavity. Correspondingly, the pushing force of the pushing member 440 drives the lower template 200 out of the die cavity. The suction member 430 can adopt an electromagnet and be attracted to the corresponding unit plate, and the pushing member 440 can adopt a cylinder and can push the corresponding unit plate to assist in disengaging from the upper female die 420.

[0090] In this embodiment, the suction member 430 can ensure the mutual fitting of the upper die mechanism 400 and the lower template during the hemming process to ensure the fitting accuracy, and the pushing member 440 can achieve the rapid separation of the upper die mechanism 400 and the lower template during the reset process. Thus, while ensuring the fitting accuracy between the upper die mechanism 400 and the lower template, it is easy to separate, realizing automatic control.

[0091] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification. When the technical features in different embodiments are shown in the same drawing, it can be regarded that the drawing also discloses the combination examples of the various embodiments involved at the same time.

[0092] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limitations on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A retractable and foldable lower die mechanism, characterized in that, Comprising: Base; Lower template, adopting a split deformation structure and having an expanded working state and a relatively narrowed state, the lower template includes a plurality of unit plates and each of the unit plates is movably fitted relative to the base; Driving mechanism, installed on the base and linked with each of the unit plates, for driving the lower template to switch states.

2. The retractable and foldable lower die mechanism according to claim 1, wherein, The unit plate includes: Middle plate, moving along a first direction; Side plates, including a left plate and a right plate arranged on both sides of the middle plate along a second direction, the left plate and the right plate moving along the second direction; The base has opposite front and rear sides, the first direction extends along the front and rear directions, and the second direction is perpendicular to the first direction.

3. The retractable and foldable lower die mechanism according to claim 2, characterized in that, Each of the unit plates is independently configured with the driving mechanism; Or each of the unit plates shares the same set of the driving mechanism, and the left plate and the right plate move synchronously and in opposite directions.

4. The retractable and foldable lower die mechanism according to claim 2, characterized in that An elastic member acts between the base and the side plates to make the lower template tend to the narrowed state or the working state.

5. The retractable and foldable lower die mechanism according to claim 2, characterized in that, In the working state of the lower template, the front edges of each of the unit plates are connected to each other; In the narrowed state, the middle plate moves further close to the base along the first direction, and the left plate and the right plate approach each other to surround the front side of the middle plate.

6. The retractable and foldable lower die mechanism according to claim 5, wherein On the opposite sides of the left plate and the right plate facing each other, avoidance areas are respectively provided, and in the narrowed state, the front side of the middle plate is located in the avoidance area.

7. The retractable and foldable lower die mechanism according to claim 2, wherein, The driving mechanism includes: Cylinder, installed on the base, the middle plate is connected to the piston rod of the cylinder; Link rods, there are two link rods, one end of each link rod is hinged to the piston rod of the cylinder, and the other end is hinged to each side plate.

8. The retractable and foldable lower die mechanism according to claim 7, wherein, A stroke adjusting member is provided on the piston rod of the cylinder, and the stroke adjusting member acts on the cylinder block to limit the retraction limit position of the piston rod.

9. The retractable and foldable lower die mechanism according to claim 2, wherein, All the unit plates are arranged coplanarly; On the opposite sides of the left plate and the right plate facing away from each other, avoidance grooves are respectively provided for folding and placing the edges of the bag-shaped fabric.

10. A patch pocket machine, comprising an upper die mechanism and a lower die mechanism that cooperate with each other to clamp the bag-shaped fabric for hemming, characterized in that, The lower die mechanism is the retractable and foldable lower die mechanism according to any one of claims 1 to 9; The upper die mechanism is provided with a plurality of sets of force application components, each set of force application components acts on a corresponding unit plate, and each set of force application components includes a suction member for keeping the unit plate clamping the bag-shaped fabric with the upper die mechanism, and a pushing member for driving the unit plate to disengage from the upper die mechanism.

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