Shoe mid-to-heel gluing process

Abstract

A process for applying adhesive to the midsole and heel counter of a shoe includes the following steps: Step S1, using a line marker, a glue application baseline is drawn on the midsole along the edge of the midsole with a preset inward reduction; Step S2, the midsole is fixed to a shoe last and then to a midsole and heel counter forming machine; Step S3, the glue application baseline guides the midsole and heel counter forming machine to establish a glue application trajectory; Step S4, the midsole and heel counter forming machine applies adhesive according to the glue application trajectory and fixes the upper to the midsole. By referencing the pre-drawn glue application baseline on the midsole to establish the glue application trajectory, the sampling position for establishing the trajectory matches the actual glue application position, improving the accuracy of the trajectory establishment and eliminating reliance on visual inspection, thus enhancing the convenience of the trajectory establishment process.

Description

[Technical Field]

[0001] This invention belongs to the technical field related to shoemaking, and in particular to a process for applying adhesive to the heel counter of a shoe. [Previous Technology]

[0002] In general shoe manufacturing, the upper and midsole need to be bonded and fixed before the upper can be further bonded and fixed to the sole. The industry commonly uses a shoe upper forming machine, such as the one disclosed in Taiwan's D180938 design patent, to bond the upper and midsole after applying adhesive to the midsole. To ensure consistent adhesive application on the midsole forming machine, an adhesive application trajectory is usually set beforehand, and the machine then completes the adhesive application and bonding along this trajectory.

[0003] Traditional mid-to-back upper forming machines lack auxiliary devices for drawing the glue application trajectory. For example, the glue feeding mechanism of the shoe upper machine disclosed in Taiwan Patent No. M475847 and the servo trajectory glue application device of the mid-to-back upper shoe machine disclosed in Taiwan Patent No. M508229 only allow operators to visually adjust the mechanism to set the glue application trajectory. The resulting glue application trajectory is not only rough and uneven, but also has large positioning deviations due to manual visual inspection. This leads to inconsistent positions of the glue application trajectory, and during the lasting process, the deviation in the glue application position can easily cause glue overflow or insufficient glue, resulting in failure to bond and affecting product quality.

[0004] An industry-standard approach involves using a screen to assist in drawing virtual adhesive application trajectories. This involves placing the shoe midsole in front of a human-machine interface (HMI) screen and setting the adhesive application trajectory based on the shape and markings of the midsole. While the resulting adhesive application trajectory is smooth and fluid, the size of the HMI screen limits its accuracy, leading to positioning errors and inconvenient operation. Another example is the visual servo control system for applying adhesive to the heel countertop, disclosed in Taiwan's Utility Model Patent No. M514756. This system places the shoe midsole in front of a camera, takes an image of the workpiece, and automatically generates the adhesive application trajectory using a computer. While this produces the smoothest adhesive application trajectory, the overall equipment cost is high, failing to meet production cost control requirements. However, whether drawing the adhesive application trajectory through a screen or automatically drawing it from a computer image, both methods rely on image-based trajectory positioning rather than direct sampling and positioning on the physical object. This results in discrepancies between the actual adhesive path and the preset adhesive application trajectory.

[0005] In view of this, how to solve the above problems is the primary issue that the present invention aims to address. [Summary of the Invention]

[0006] The main objective of this invention is to provide a process for applying adhesive to the midsole and heel counter of a shoe. By drawing a glue application baseline directly on the midsole of the shoe using a line marker, the midsole of the shoe is fixed, and the glue application baseline is used to teach the midsole and heel counter forming machine to learn and establish a glue application trajectory. This allows for accurate positioning of the glue application and fixation of the shoe upper, improving the accuracy of sampling and positioning the glue application baseline on the midsole, increasing product yield, and saving production costs.

[0007] To achieve the aforementioned objectives, the present invention adopts the following technical solution:

[0008] A process for applying adhesive to the heel counter of a shoe, comprising the following steps:

[0009] Step S1, draw the glue application baseline; use a line drawing tool to draw a glue application baseline on the midsole of a shoe along the edge of the midsole with a preset inward shrinkage amount. The line drawing tool can adjust the inward shrinkage amount as needed to change the position of the glue application baseline.

[0010] Step S2, fix the shoe midsole; the shoe midsole with the glue application baseline drawn is fixed to a shoe last and then fixed to a glue application mechanism in the back forming machine;

[0011] Step S3, establish a glue wiping trajectory; the glue wiping baseline is used to teach the system of the middle and rear forming machine to learn and establish a glue wiping trajectory;

[0012] Step S4, applying adhesive to the upper; after the midsole forming machine applies adhesive along the established adhesive application trajectory and the adhesive application baseline, it fixes the upper to the midsole.

[0013] Preferably, the line drawing device has a base, the base is provided with a moving mechanism, the moving mechanism fixes a drawing pen and drives the drawing pen to move back and forth on one side of the base, the base is provided with a reference part on the same side as the drawing pen, the reference part is disposed opposite to the writing end of the drawing pen, and the distance between the drawing pen and the reference part is adjusted by the moving mechanism to change the drawing position of the adhesive reference line.

[0014] Further, the moving mechanism has a front fixed seat, a rear fixed seat and a moving member. The front fixed seat and the rear fixed seat are arranged opposite each other on the top of the base. The moving member has a pen holder for fixing the drawing pen. A connecting rod extends horizontally from one side of the pen holder. A threaded section is provided on the outer surface of the connecting rod and the threaded section passes through the front fixed seat and the rear fixed seat. A knob is provided between the front fixed seat and the rear fixed seat and is screwed into the connecting rod. By rotating the knob, the moving member is driven to move linearly to change the distance between the drawing pen and the reference part.

[0015] Furthermore, the connecting rod has a rectangular segment with a rectangular cross-sectional shape and is located between the pen holder and the threaded segment. The cross-sectional shape of the through hole of the front fixing seat is the same as the cross-sectional shape of the rectangular segment. The connecting rod maintains linear movement by the cooperation between the through hole of the front fixing seat and the rectangular segment.

[0016] Preferably, the outer periphery of the rectangular segment is provided with a size scale for measuring and displaying the distance between the writing tip of the drawing pen and the reference part.

[0017] Preferably, the base portion has an upper stop portion and a lower stop portion that are arranged at an upper and lower interval, such that a guide groove is formed between the upper stop portion and the lower stop portion, which is used to guide the base to move along the edge of the shoe midsole when fitted onto the edge of the shoe midsole.

[0018] Preferably, the guide groove is provided with an arc-shaped abutment for the edge of the shoe midsole to abut.

[0019] Furthermore, the upper stop is provided with an opening facing the drawing pen through groove, so that the writing end of the drawing pen can move inward into the guide groove.

[0020] Preferably, in step S3, the system of the middle and rear forming machine automatically connects the glue-wiping trajectory by controlling its glue-wiping mechanism to set the position point by point from the starting point of the glue-wiping baseline.

[0021] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly uses a line drawing device to pre-draw the glue wiping baseline. The operator directly teaches the system of the molding machine to establish the glue wiping trajectory based on the glue wiping baseline, ensuring that the glue wiping trajectory is consistent with the position of the glue wiping baseline, and accurately wiping the glue, thereby solving the problem of glue overflow or poor adhesion and improving the product yield.

[0022] The above-mentioned objects and advantages of the present invention can be readily understood from the following detailed description of the selected embodiments and the accompanying drawings.

Implementation Method

[0023] As shown in Figure 1, this is a preferred embodiment of the adhesive application process for the heel counter of the shoe according to the present invention, which includes the following steps:

[0024] Step S1, draw the glue application baseline; use a line drawing tool to draw a glue application baseline on the midsole of a shoe along the edge of the midsole with a preset inward shrinkage amount. The line drawing tool can adjust the inward shrinkage amount as needed to change the position of the glue application baseline.

[0025] To further explain, the indentation amount refers to the vertical distance between any point on the midsole where the adhesive application reference line is drawn and the edge of the midsole. The adhesive application reference line is drawn on the midsole according to a preset indentation amount, meaning the vertical distance between any point on the midsole where the adhesive application reference line is drawn and the edge of the midsole remains constant, thus creating a smooth and fluid adhesive application reference line. Therefore, by changing the indentation amount, i.e., changing the position of the adhesive application reference line, it is possible to draw adhesive application reference lines on midsoles of different sizes and shapes.

[0026] Step S2, fix the shoe midsole; the shoe midsole with the glue application baseline drawn is fixed to a shoe last and then fixed to a glue application mechanism in the back forming machine;

[0027] To further explain, after the shoe midsole is fixed in the processing position, step S3 is executed to ensure that the position of the glue wiping trajectory is the same as the actual glue wiping position, so as to avoid the glue path deviation caused by the position deviation.

[0028] Step S3, establish a glue wiping trajectory; the glue wiping baseline is used to teach the system of the middle and rear forming machine to learn and establish a glue wiping trajectory;

[0029] Further explanation: The system of the middle and rear forming machine automatically connects the glue-wiping trajectory by controlling its glue-wiping mechanism to set positions point by point from the starting point of the glue-wiping reference line. This glue-wiping trajectory is established based on a pre-drawn glue-wiping reference line, providing better accuracy compared to traditional visual methods of drawing the glue-wiping trajectory. Furthermore, compared to drawing by selecting points on the screen or automatically drawing by image capture, it solves the problem of glue path deviation caused by the difference between the established glue-wiping trajectory position and the actual glue-wiping position.

[0030] Step S4, applying adhesive to the upper; after the midsole forming machine applies adhesive along the established adhesive application trajectory and the adhesive application baseline, it fixes the upper to the midsole.

[0031] To further explain, by establishing a precise adhesive application trajectory, the problem of adhesive overflow or insufficient application at the bonding position caused by adhesive application position deviation is effectively solved, thereby improving product yield.

[0032] As shown in Figures 2 and 3, the drawing device has a base 1, a moving mechanism 2 on the top of the base 1, and a reference part 3 on one side of its bottom. The moving mechanism 2 has a front fixed seat 21, a rear fixed seat 22, and a moving member 23. The front fixed seat 21 and the rear fixed seat 22 are respectively provided with through holes 211 and 221 and are arranged opposite to each other on the top of the base 1. The moving member 23 has a pen holder 231 and a connecting rod 232 extending horizontally from one side of the pen holder 231. A drawing pen 4 is fixed by the pen holder 231. The outer surface of the connecting rod 232 is provided with a threaded section 233, and the threaded section 233 passes through the front fixed seat 21 and the rear fixed seat 22, so that the pen holder 231 and the reference part 3 are on the same side and the writing end 41 of the drawing pen 4 is arranged opposite to the reference part 3. A knob 24 is located between the front fixed seat 21 and the rear fixed seat 22 and is screwed into the connecting rod 232, so that the knob 24 can rotate in the threaded section 233 to drive the connecting rod 232 to move.

[0033] Special note: Please refer to Figure 3. The connecting rod 232 has a rectangular segment 234 that connects to the pen holder 231 and the threaded segment 233 respectively. The cross-sectional shape of the rectangular segment 234 is rectangular, and the cross-sectional shape of the through hole 211 of the front fixing seat 21 is the same as the cross-sectional shape of the rectangular segment 234. By cooperating with the rectangular segment through the through hole 211 of the front fixing seat 21, the connecting rod 232 is limited, so that the connecting rod 232 moves back and forth in the direction of rotation of the knob 24, thereby driving the drawing pen 4 fixed to the pen holder 231 to move, so as to change the position between the drawing pen 4 and the reference part 3, that is, to adjust the inward amount W of drawing the adhesive datum line L, so as to achieve the effect of adjusting the inward amount W to change the position of the adhesive datum line as needed.

[0034] Furthermore, the reference part 3 has an upper stop 31 and a lower stop 32 arranged at an upper and lower interval, forming a guide groove 33 between the upper stop 31 and the lower stop 32, which is used to fit onto the edge of the shoe midsole and guide the base 1 to move along the edge of the shoe midsole. The upper stop 31 has a through groove 311 with an opening facing the drawing pen 4, allowing the writing end 41 of the drawing pen 4 to move inward into the guide groove 33, enabling the drawing of the adhesive reference line L with a small inward reduction W, suitable for small-sized shoe midsoles. Referring to Figures 2 to 4, the guide groove 33 also has an arc-shaped abutment part 34 protruding towards the drawing pen 4. During drawing, as shown in Figures 5 and 6, the guide groove 33 of the reference part 3 fits onto the edge 51 of the shoe midsole 5, and the abutment part 34 abuts against the edge 51 of the shoe midsole 5. Because the edge 51 of the midsole 5 is curved, the contact area between the arc-shaped abutment 34 and the edge 51 of the midsole 5 is small, which reduces the friction between the base 1 and the midsole 5 when the base 1 moves, making the base 1 move more smoothly. As a result, when the base 1 moves, the edge 51 of the midsole 5 remains abutted against the abutment 34 and does not form a gap at the bend, ensuring that the vertical distance (i.e., the inward amount W) between any drawing point of the glue-rubbing reference line L and the edge 51 of the midsole 5 is consistent, thus achieving the effect of accurately drawing the glue-rubbing reference line L.

[0035] To facilitate quick adjustment of the indentation amount by the user, as shown in Figure 5, the outer periphery of the rectangular segment 234 of the connecting rod 232 is also provided with a dimension scale 235 for indicating length. The length D read through the dimension scale 235 is equal to the distance T between the writing end 41 of the drawing pen 4 and the abutment part 34 of the reference part 3. Therefore, by reading the length indicated by the dimension scale 235 between the pen holder 231 and the front fixing seat 21, the user can know the distance T between the writing end 41 of the drawing pen 4 and the abutment part 34. This distance T is the indentation amount W for drawing the adhesive reference line L on the shoe midsole 5. Therefore, the user can rotate the knob 24 to move the connecting rod 232 and adjust it until the scale reading of the dimension scale 235 is consistent with the preset indentation amount W. This allows for convenient and accurate adjustment of the indentation amount W, meeting the needs of drawing adhesive reference lines on shoe midsoles of different sizes and shapes.

[0036] In summary, the shoe mid-to-heel upper gluing process provided by the present invention can achieve the following improvements:

[0037] First, accurately establish the glue application trajectory; This invention uses a line marker to pre-draw the glue application baseline on the shoe midsole, then combines the shoe midsole with the shoe last and fixes it to the shoe mid-to-rear molding machine. The glue application trajectory is directly established on the shoe midsole according to the glue application baseline. That is, the glue application trajectory teaching position is consistent with the actual glue application position. There is no problem of glue application trajectory deviation caused by positional deviation in conventional technology, and there is no need to rely entirely on visual inspection. This improves the convenience of establishing the glue application trajectory and achieves the effect of accurately establishing the glue application trajectory.

[0038] Second, the drawing position of the glue application reference line can be flexibly changed; the drawing device of the present invention uses the reference part to abut against the edge of the shoe midsole, and adjusts the distance between the drawing pen and the reference part by the moving mechanism to change the amount of indentation of the drawing, thereby meeting the glue application reference line drawing requirements of different shoe midsole and heel counters.

[0039] Third, it saves production costs; the present invention does not require an additional built-in image recognition structure in the shoe heel forming machine, reducing the purchase and maintenance costs of production equipment, and is simple to operate. Operators can quickly get started after simple training, reducing the time and labor costs of training, thus achieving the effect of saving production costs.

[0040] However, the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Therefore, any changes in numerical values ​​or substitutions of equivalent elements should still fall within the scope of the present invention.

[0041] In summary, since this invention can indeed achieve the aforementioned objectives, it meets the requirements of the Patent Law, and therefore an application is filed in accordance with the law. [Simplified Explanation of the Diagram]

[0042] Figure 1 is a schematic diagram of the steps of the present invention. Figure 2 is a schematic diagram of the three-dimensional structure of the drawing pen of the present invention. Figure 3 is a schematic diagram of the exploded structure of the drawing pen of the present invention. Figure 4 is a cross-sectional view of the base portion of the present invention. Figure 5 is a side view of the drawing pen of the present invention. Figure 6 is a top view of the drawing pen of the present invention in its usage state.

Claims

1. A process for applying adhesive to the heel counter of a shoe, comprising the following steps: Step S1, drawing a glue application baseline; using a line marker, a glue application baseline is drawn on the shoe midsole along the edge of the midsole with a preset inward reduction, the line marker being adjustable to change the position of the glue application baseline as needed; Step S2, fixing the shoe midsole; the shoe midsole with the glue application baseline drawn is fixed to a shoe last and then to a heel counter forming machine with a glue application mechanism; Step S3, establishing a glue application trajectory; the glue application baseline is used to teach the system of the heel counter forming machine to learn and establish a glue application trajectory; Step S4, glue application and bonding; after the heel counter forming machine applies glue along the established glue application trajectory and the glue application baseline, a shoe upper is bonded and fixed to the shoe midsole; wherein... The line marker has a base with a moving mechanism. The moving mechanism fixes a drawing pen and moves the pen back and forth along one side of the base. The base has a reference portion on the same side as the drawing pen, which is positioned opposite the writing end of the pen. The reference portion rests against the edge of the shoe midsole, and the moving mechanism adjusts the distance between the drawing pen and the reference portion to change the position of the erased reference line. The moving mechanism includes a front fixing seat, a rear fixing seat, and... A movable component has a front fixed base and a rear fixed base arranged opposite each other on the top of the base. The movable component has a pen holder for fixing the drawing pen. A connecting rod extends horizontally from one side of the pen holder. The outer surface of the connecting rod is provided with a threaded section, which passes through the front fixed base and the rear fixed base. A knob is located between the front fixed base and the rear fixed base and is screwed into the connecting rod. By rotating the knob, the movable component is driven to move linearly to change the distance between the drawing pen and the reference part.

2. The shoe heel countertop gluing process as described in claim 1, wherein, The connecting rod has a rectangular segment with a rectangular cross-section and is located between the pen holder and the threaded segment. The cross-sectional shape of the through hole of the front fixing seat is the same as that of the rectangular segment. The connecting rod maintains linear movement by the cooperation between the through hole of the front fixing seat and the rectangular segment.

3. The shoe heel countertop gluing process as described in claim 2, wherein, The outer periphery of the rectangular segment is provided with a dimensional scale to measure and display the distance between the writing tip of the drawing pen and the reference part.

4. The shoe heel countertop gluing process as described in claim 1, wherein, The base has an upper stop and a lower stop that are spaced apart from each other, forming a guide groove between the upper stop and the lower stop, which is used to guide the base to move along the edge of the shoe midsole when fitted onto the edge of the shoe midsole.

5. The shoe heel countertop gluing process as described in claim 4, wherein, The guide groove has an arc-shaped abutment for the edge of the shoe midsole to abut.

6. The shoe heel countertop gluing process as described in claim 4, wherein, The upper stop has an opening facing the groove of the drawing pen, so that the writing end of the drawing pen can move inward into the guide groove.

7. The shoe heel countertop gluing process as described in claim 1, wherein, In step S3, the system of the middle and rear forming machine automatically connects the glue-wiping trajectory by controlling its glue-wiping mechanism to set the position point by point from the starting point of the glue-wiping baseline.

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