129results about "Leather stretching/tensioning" patented technology

The invention discloses a leather stretching and leveling device for leather product production and relates to the technical field of leather processing. The leather stretching and leveling device comprises a supporting rack, a leveling table for supporting leather is fixedly mounted on the supporting rack, two clamping mechanisms for clamping leather are symmetrically arranged on two sides of theleveling table, a lead screw I and a lead screw II which are coaxially fixed, opposite in thread rotating direction, are horizontally arranged in the supporting rack, thread bushing blocks in transmission connection to the clamping mechanisms are arranged on the lead screw I and the lead screw II in a threaded connecting sleeving manner, and the lower end of a leaning rod is higher than the bottom surface of a pressure plate. The pressure plate moves downward to compress the leather to the leveling table and the clamping mechanisms are driven by a lifting rack to pull the leather downward, sothat the leather supported by the leveling table is stretched and leveled effectively. A compression roller rolls the leather toward two sides in the process that the pressure plate moves downward, so that the leveling effect of the surface of the leather is improved greatly and the leather leveling efficiency is high.

A method, a system and a pelt board for the drying of the leather side of pelts from furred animals, in which the pelt board is a hollow distension element, the surface of which has an open structure. The leather side is dried by changing the air within the distension element. The distension element is lockable in a position in which it has a first circumference, and can also assume a position or be force controlled to a position in which it has a circumference which is smaller than the first, which results in a considerably easier removal of the pelt from the pelt board. A quicker, more uniform and more effective drying of the pelts is achieved, so that “black spots” on the leather side are avoided, and the pelt is fixed in its stretched position on the pelt board without the use of clips / staples.

A method and apparatus of a toggle clamp assist tool for a toggle clamp having a clamp jaw, clamp arm, and a clamp loop. The toggle clamp assist tool comprises a base member. A clamp pin coupled to the base and configured to engage the clamp loop of the toggle clamp. An actuator is mounted on the base and configured to contact the clamp arm of the toggle clamp. A controller is coupled to the actuator, wherein the actuator is selectively in contact with the clamp arm of the toggle clamp when the controller is activated. The actuator may be one of a fluid cylinder and an electric apparatus.

The invention relates to the field of leather processing and discloses an automatic leather tightening device. The automatic leather tightening device comprises a leather tightening moving component, a leather edge position identifying component, a leather pressing assembly and a leather horizontal moving and positioning component. The leather horizontal moving and positioning component is mounted on a rack and is guided through a guide rail. The leather edge position identifying component is arranged across the rack. The leather pressing assembly is composed of a power-losing electromagnet, clamping iron and double-arm mechanical hands. By the adoption of the automatic leather tightening device, it is guaranteed that the leather can be tightened and also can be conveyed to the next working unit. Compared with the prior art, the automatic leather tightening device has the beneficial effects that fast, uniform and automatic tightening of the leather is achieved, the labor cost is saved, and the leather processing quality is improved.

A pelt drying assembly having a pelt board used in the drying of the leather side of a pelt which, in use, is applied to, stretched and secured on the distension element in the stretched position during drying, and a sleeve / bag made of fat and moisture absorbing material for covering the pelt secured in the stretched position by having been drawn over the fur side of the pelt so as to press the pelt against a holding area of the distension element. The sleeve / bag is tubular for drawing onto the pelt board from a pointed end thereof until it covers at least a part of the holding area on the distension element, and has a length equal to at least 1 / 3, preferably 1 / 2, of the length of the holding area of the distension element.

The invention discloses a leather traction device for garment manufacturing. The leather traction device comprising a base; a first supporting plate and a second supporting plate are fixed to the two sides of the upper surface of the base correspondingly; a first rotating shaft is arranged between the tops of the first supporting plate and the second supporting plate; lead screws are symmetrically arranged on the two sides of the first rotating shaft, and supporting blocks are movably mounted on the two lead screws correspondingly; supporting rods are arranged at the tops of the supporting blocks; traction plates are arranged at the tops of the supporting rods, and leather is arranged between the two traction plates; a first mounting plate and a second mounting plate are fixedly mounted on the two sides of the upper surface of the base; and a driving motor is fixed to the side, close to the second supporting plate, of the top of the first mounting plate. In the leather traction device, the leather can be made to flatly transited into the next step of processing working procedure, leather of different sizes can be subjected to traction, the time is saved, the continuity of the device is high, the working efficiency is effectively improved, and the device is simple in structure, novel in design and worth popularizing.

The invention relates to a leather flattening mechanism of a vacuum drying machine. The mechanism comprises a lifting mechanism, a movable base, a pressing foot and a leather shoveling mechanism. The lifting mechanism comprises a cantilever horizontally above a drying platen, and a lifting column vertically arranged at the lateral end of the drying platen. The movable base is installed at the lateral end of the side, away from the lifting column, of the cantilever. The pressing foot is installed at the lower end of the movable base and is connected with the movable base through a telescopic mechanism. The leather shoveling mechanism comprises a plurality of annularly distributed rotary arms, and one end of each rotary arm is hinged to the movable base. A torsion spring or tension spring is further installed at the position, where each rotary arm is hinged to the movable base, on the rotary arm. The rotary arms can be driven by unfolding mechanisms to be unfolded outward. A scraper knife and a knife roller are installed at the bottom end of each rotary arm. The leather flattening mechanism has the advantages that leather laid on the drying platen can be automatically flattened by means of the leather flattening mechanism, the mechanism is very convenient to use, manual flattening is not needed, and accordingly manual labor is reduced.

The present invention provides a wet leather stretching device, including a second bracket (12) provided with a mechanism for adjusting tension of a first belt (17), wherein the mechanism includes: a movable plate (41) coupled to each of left and right side surfaces of the second bracket (12); a support plate (31) coupled to one surface of each movable plate (41); a cylinder (32) having a lower part fixedly coupled to a lower part surface of each support plate (31); a rod (33) protruding a certain length through an upper part of each cylinder (32); a guide end (35) provided on one surface of the movable plate (41) at a distance above the support plate (31); a guide plate (36) connected to the rod (33) and contacting with the guide end (35), and a movable pipe (37) with a predetermined length contacting with the first belt (17).

The invention relates to a fur stretching device. The fur stretching device comprises a supporting table, a clamping assembly, nail plates and a positioning piece, the supporting table is placed on the ground, two sliding rails are arranged on the two sides of the upper surface of the supporting table, the clamping assembly is arranged on the supporting table and located between the two sliding rails, the clamping assembly comprises clamping blocks, the clamping blocks are in sliding connection with the sliding rails, the two nail plates are provided and are horizontally placed on the slidingrails, fur is fixed on the nail plates, the side surfaces of the sides, close to each other, of the nail plates are arranged as arc surfaces, the clamping blocks can push the two nail plates to move towards each other, so that the connecting portion of the nail plates is arched upwards to stretch the fur, the two nail plates form a V-shaped structure, an opening faces downwards, the positioning piece is arranged at the opening of the V-shaped structure formed by the two nail plates, and the positioning piece connects the lower ends of the two nail plates to define the positions of the two nailplates. According to the fur stretching device, the fur can be stretched, moreover, the fur can be kept in a stable tension state in a relatively long period of time, and the problem of looseness isnot prone to occurrence.

The invention relates to a production method of solvent resistant leather and belongs to the technical field of leather. The production method of the solvent resistant leather comprises steps as follows: a leather crust is prepared and processed sequentially according to steps as follows: softening through vibration, toggling, filling, vacuum pumping, mending, leather buffing, soot blowing, spraying of an adhesive agent, primary roll coating, primary plate pressing, secondary roll coating, secondary plate pressing, spraying, primary spraying of polyurethane gloss oil, tertiary plate pressing, secondary spraying of the polyurethane gloss oil, roll finish and spraying of a feeling agent. The leather produced with the method not only has excellent solvent resistance, but also has good aging resistance.

With the use of modern distension elements / pelt boards (6) consisting of two half-parts with surfaces (14) with open structure (18) in connection with the drying of pelts (26), where the pelt is secured in the stretched position during the drying procedure by means of a holding bag (28) which, in an area at the tail end of the pelt, presses the pelt against a special holding area (8) on the surface of the distension element / pelt board, there can appear areas of the pelt where this has not been sufficiently dried, and where the pelt therefore turns mouldy / decays. Moreover, as a consequence of the pelt slipping on the surface of the board, it can be difficult to obtain a straight measuring line for the measurement of the length of the pelt. In order to relieve these problems, there is disclosed a sleeve / pelt bag item of fat and moisture absorbing material which is characteristic in that the pelt bag (10) consists of a tubular bag item to be drawn over the outside of the distension element / pelt board from the pointed end of the board for the covering of at least a part of the holding area on the distension element, the extent of said pelt bag corresponding at least to 1 / 3 but preferably1 / 2 of the extent of the holding area (8) on the distension element (6).

A method, a system and a pelt board for the drying of the leather side of pelts from furred animals, in which the pelt board is a hollow distension element, the surface of which has an open structure. The the leather side is dried by changing the air within the distension element. The distension element is is lockable in a position in which it has a first circumference, and can also assume a position or be force controlled to a position in which it has a circumference which is smaller than the first, which results in a considerably easier removal of the pelt from the pelt board. A quicker, more uniform and more effective drying of the pelts is achieved, so that “black spots” on the leather side are avoided, and the pelt is fixed in its stretched position on the pelt board without the use of clips / staples.

The invention discloses a production method of shrunk grain leather. According to the production method disclosed by the invention, a whole skinned animal skin material is used as a raw material, water immersion is carried out, fleshing operation can be respectively carried out after each immersion, and unhairing and swelling can be carried out after second immersion and before the fleshing operation; hide fiber is opened as possible starting from blue skin, big neutralization is adopted during a retanning stage, moderate filling is carried out, the using amount of vegetable tannin is increased, the loose degree of the hide fiber is enlarged as far as possible by a wet toggling plate, crust is subjected to re-embossing, rewetting can be carried out after patterns are sized through millingby a drum, temperature-controlled and humidity-controlled milling can be carried out by using a temperature-controlled stainless steel drum, the humidity of the crust is controlled by utilizing an alternate cooling and heating method, and leather patterns are shrunk, so that uniform and consistent shrunk grain leather can be produced.

A work table for an automatic machine for cutting leathers and the like, includes a plurality of holes opening outwards and communicating with a vacuum source, to make portions of leathers to adhere to the active surface (3) of the work table (1). The work table (1) includes a central body (1a), supported by a fixed structure (2). At least one lateral portion (1h, 1j), connected to the fixed structure (2), is moved by first motion means (10h, 10j) between at least one work configuration (K1), in which its active surface (3h, 3j) is aligned with the active surface (3a) of the central body (1a), to define the active surface (3) of the work table (1), and a rest configuration (K2) of reduced dimension, in which the active surfaces (3a, 3h, 3j) of the central body (1a) and the lateral portion (1h, 1j) are arranged at an angle with respect to each other.

In connection with the non-destructive stretching and fastening of pelts (2) on distention elements / pelt boards (4), where the pelt is stretched and fastened in the stretched position during the drying process by means of a fixing bag, it has shown that the pelts give way (shrink) on each side of the tail root of the pelt, with the result that use is made of a number of staples for the fastening of these places on the stretched pelt. Since it is not at all desirable to use staples, a development of the pelt boards (4) has taken place, so that these have an arched extent around two transverse axes in relation to their longitudinal axes. Moreover, it has long been desirable to be able to stretch the pelts to a greater degree, which has not been possible with the use of the known stretching machines. This development has led to the development of a method and a stretching machine for the execution of the method, where the gripping elements are configured to correspond with the shape of the pelt board, and where the pelt is engaged by the gripping elements along the whole of the lower periphery of the pelt, so that the counter-hold force in the pelt is distributed over the whole periphery of the pelt, whereby the pelt can be stretched to a greater degree without any damage to the pelt in the areas of engagement for the gripping elements.

The invention discloses a method for tightening leather. A device for tightening leather is used for the method; the device comprises a tightening plate, a framework, a plurality of clips and a plurality of wire stringing elements, wherein the tightening plate is used for accommodating leather; the frame of the framework is positioned on the periphery of the tightening plate; one end of each clip is connected with ropes; the plurality of wire stringing elements correspond to the clips; the framework is provided with a support part for accommodating the tightening plate; the wire stringing elements are dispersively arranged on the periphery of the tightening plate, and are fixedly connected with the frame of the framework. The method comprises the following steps: spreading the leather on the tightening plate; clamping the edge of the leather by the plurality of clips which are dispersed at the periphery of the leather; tightening the ropes by the wire stringing elements and stretching the leather until the area of the leather is not changed. The method for tightening the leather is characterized in that the leather can be tightened more uniformly so as to obtain a relatively large leather area, and the quality of leather products and the leather yield for leather processing are improved effectively.

The invention discloses a device for repairing holes in a surface of a leather made sofa. The device comprises a repairer box body. A working cavity opened downward is formed in the lower end surfaceof the repairer box body, two repair mechanisms are symmetrically arranged left and right in the working chamber, each repair mechanism comprises a supporting plate capable of moving left and right, an input shaft is rotatably arranged on the front end surface of the supporting plate, six rotating rods are uniformly and fixedly arranged on the input shaft, and repair wheels, the lower ends of which penetrate the lower end wall of the working chamber, are arranged on the lower sides of the rotating rods. For the characteristics of a leather product, leather is softened and stretched by way of extrusion to the center by the two wheels, so that the sizes of holes in the surface of the leather made sofa are reduced, the leather is softened under the circumstance of damaging the physical property of the leather to a less extent, so that the leather is fully repaired subsequently. The distance between the two wheels can be adjusted according to the sizes of the holes in the surface of the leather made sofa, so that the best repair effect is achieved.

In connection with the non-destructive stretching and fastening of pelts (2) on distention elements / pelt boards (4), where the pelt is stretched and fastened in the stretched position during the drying process by means of a fixing bag, it has shown that the pelts give way (shrink) on each side of the tail root of the pelt, with the result that use is made of a number of staples for the fastening of these places on the stretched pelt. Since it is not at all desirable to use staples, a development of the distension elements / pelt boards (4) has taken place, so that these have an arched extent around two transverse axes in relation to their longitudinal axes. Moreover, it has long been desirable to be able to stretch the pelts to a greater degree, which has not been possible with the use of the known stretching machines. This development has led to the development of a method and a stretching machine for the execution of the method, where the gripping elements are configured to correspond with the shape of the distension element / pelt board, and where the pelt is engaged by the gripping elements along the whole of the lower periphery of the pelt, so that the counter-hold force in the pelt is distributed over the whole periphery of the pelt, whereby the pelt can be stretched to a greater degree without any damage to the pelt in the areas of engagement for the gripping elements.

A pelt board (11) is disclosed for stretching and drying of tubular pelts (5), the pelt board (11) having a tip end (4) from which the pelt is drawn onto the pelt board (11) and a foot end (2), wherein the pelt board (11) has a lower part (8) nearest the foot end (2) where the outer cross-sectional circumference of the pelt board (11) is substantially constant and an upper part (9) between the lower part (8) and the tip end (4), where the outer cross-sectional circumference of the upper part (9) gradually decreases towards the tip end (4), wherein the longitudinal extent (L1) of the lower part (8) is in the range of 36 to 50 cm, more preferably in the range of 40 to 45 cm. Furthermore is disclosed an extension piece for connecting with a standard pelt board and fat-absorbing inner bags (13, 19) for use with the pelt board (11).

The invention relates to the technical field of stretcher equipment, and discloses a cow leather stretcher. The cow leather stretcher comprises a bottom plate, wherein the top of the bottom plate is sequentially and fixedly connected with a right stand column and a left stand column from right to left, a downward pulling device is arranged on one side of the left stand column, the downward pullingdevice comprises a main motor, an output shaft of the main motor is fixedly connected with a main rotating shaft, a conical gear is arranged at the top of the main rotating shaft, and a driving rod is arranged on one side of the conical gear. According to the cow leather stretcher, the downward pulling device, a pull plate and a hook are arranged, so that the main motor is used for driving the driving rod to rotate, and then a first rotating rod is rotated; a second rotating rod is driven to move up and down under the action of a movable rod through rotation of the first rotating rod, then the pull plate on one side of a fixing block is driven to move up and down in a sliding groove so as to stretch a cow leather ring between the pull plate and the hook, and the action force on the lowerpart of the cow leather ring is uniform, so that the purpose of up-and-down reciprocating stretching is achieved; and mechanical production is achieved, so that the production efficiency is greatly improved, and the production cost is reduced.

The embodiment of the invention discloses a cutting tool, which comprises a stand, a pushing mechanism arranged on the stand, a tool group arranged on the pushing mechanism, and a toggle mechanism arranged on the stand. The tool is used for cutting, the cutting and setting are in place at one time, and the working time is shortened; the toggle tool can be continuously used to improve operating continuity and work efficiency; the toggle tool is used to overcome errors caused by manual dragging of sheets, ensure consistence of the dragging force and improve specification consistency of products; and a member of cutting personnel is reduced, and labor intensity is reduced.

A drying or treatment in general plant for leather, or similar products, provides a conveyor apparatus of the type with overlapping conveyor belts in which the products are kept in a flat position between the two belts through their run inside the treatment chamber, between a loading station and an unloading station, thanks to the perfect synchronization of the feeding run of the belts and to the complanation of the transmission chains which combine with the transversal stretching means of the belts. The transmission chains of the two belts are shaped as to allow to easily separate the two belts when they come close to the loading and unloading stations, and then to overlap them again.

A method for the Continuous gradual stretching and drying of industrial hides and similar products comprises at least one step (a) involving the initial partial drying of the completely wetted hides supplied following a treatment with liquids, such as tanning, retanning or dyeing, until their relative moisture content is reduced to between 45% and 65%, at least one step (b) involving the final stretching of the hides by means of localised mechanical stresses able to recover the shrinkage resulting from the partial drying thereof, characterized in that, after said initial partial drying step (a), at least one intermediate stretching step (c) is performed, followed by intermediate partial drying (d) followed by at least one intermediate stretching step (e) before proceeding to said step (c) involving the final drying and heat-fixing of the hides.

The invention relates to the technical field of leather making process, and provides a method for making flexible dry milled leather through low-grade wet blue leather. The method comprises the stepsof water squeezing shaving and weighing of the selected low-grade wet blue leather, softening and rising, washing, neutralizing, washing, grease adding, washing, drum outlet standing, water squeezingextension, primary hanging airing drying, softening, dyeing, washing, color registering, washing, surface treatment, washing, drum outlet standing, water squeezing extension, secondary hanging airingdrying, flesh side water spraying and standing, vibration staking, milling and coating. On the basis of the traditional process, three procedures of retanning, filling and vacuum drying in the after-tanning wet machining segment can be removed, the whole operation flow is short, the method is suitable for large-batch production use, the cost is reduced by 30%, the leather yield is increased by 20%, the leather hand feeling is soft and light, the leather body is rich and elastic, the pattern is full and uniform, and the utilization rate is high.

The invention relates to the technical field of leather stretching, in particular to leather stretching equipment. The leather stretching equipment comprises a base and further comprises an operation base in screw joint to one end of the upper side of the base through a thread, a first stretching component, and a second stretching component clamped and connected to the other end of the upper side of the base. The first stretching component comprises an outer fixing cover, an inner clamping and connecting head clamped and connected to the lower portion of the outer fixing cover, a clamping and connecting disc, clamping and connecting feet clamped and connected to the lower side of the clamping and connecting disc, a push rod, a guiding barrel arranged on the push rod in a sleeving manner in the axial direction of the push rod, an outer clamping frame in screw joint to the end portion of the guiding barrel through a thread, an extrusion piece, a buffering piece, a first spring, a first screw joint head, a clamping head and an adjusting rod, wherein the first spring is pressed between the buffering piece and the extrusion piece, and the adjusting rod is screwed on the first screw joint head in the radial direction of the first screw joint head. The leather stretching equipment is convenient to adjust, and the stretching quality is good.