Full FAQ of 15 Core Shoe-Making Machines for Complete Production Line
list of shoe-making machinery
1. Swing Arm Hydraulic Cutting Machine (Material Cutting)
2. Gantry Heavy-Duty Cutting Machine (Large Panel Cutting)
3. Computerized Vibration Knife Cutting Machine (Intelligent Cutting)
4. Band Knife Splitting Machine (Upper Preparation)
5. Fully Automatic Hot Melt Cement Folding Machine (Edge Treatment)
6. Roller Feed Sewing Machine / Post Bed Sewing Machine (Upper Stitching)
7. High-Speed Computerized Pattern Sewing Machine (Automatic Stitching)
8. Fully Automatic Toe Lasting Machine (Toe Molding)
9. Fully Automatic Heel Lasting Machine (Heel Molding)
10. Infrared Multi-Zone Drying Conveyor Line (Assembly Line Drying)
11. Universal Air Bag Sole Pressing Machine (Sole Bonding & Molding)
12. High-Speed Quick Freezing Setting Machine (Setting & Last Stripping)
13. Fully Automatic Injection Sole Molding Machine (Outsole Manufacturing)
14. Intelligent 3D Vision Glue Spraying Robot (Intelligent Molding Spraying)
15. Automatic Last Stripping Robot (Intelligent Post-Processing)
1. Swing Arm Hydraulic Cutting Machine
Q: Why does the swing arm rotate sluggishly with harsh friction noise?
A: Lack of grease lubrication on the vertical column or worn ball bearings. Inject grease via the oil cup on top of the column immediately, and check if the column lock nut is overly tightened.
Q: The ram does not descend after stepping on the foot pedal. Where should we inspect?
A: First check if the foot pedal micro switch has poor contact or damage; then use a multimeter to test if the hydraulic solenoid valve coil for ram
pressing is burnt or open-circuited.
Q: How to extend the service life of the plastic cutting mat?
A: Rotate and flip the mat regularly during operation, and slightly adjust the ram stroke to avoid long-term stamping on the same position and depth by cutting dies.
2. Gantry Heavy-Duty Cutting Machine
Q: Heavy "thudding" vibration occurs during stamping, and the pressing depth is inconsistent on both ends.
A: The four-column hydraulic balance system is out of adjustment or mechanical connecting rods are loose. Readjust the synchronous balance valve and check if the oil filling volume on both sides is balanced.
Q: The oil pump motor starts normally but cannot build enough pressure to cut materials.
A: Check if the hydraulic oil level is too low causing the oil pump to suck air; inspect if the overflow valve (pressure regulating valve) is stuck or blocked by dirt, which leads pressure oil to flow back directly to the oil tank.
Q: The machine can be started by pressing only one of the dual start buttons. What safety hazards does this bring?
A: This is a severe equipment failure. The dual-button interlock safety relay is damaged or short-circuited illegally. Starting the machine with one hand may easily crush the other hand, so shut down the machine for maintenance at once.
Computerized Vibration Knife Cutting Machine
Q: The leather cut edge gets scorched or the material tears during cutting.
A: Scorched edges are caused by decreased vibration frequency or dull blades generating friction heat; torn material results from insufficient vacuum adsorption that shifts leather during cutting. Clean debris on the suction platform and increase the power of the exhaust fan.
Q: The cut pattern size deviates from the drawing (e.g., a square is cut into a rectangle).
A: Pulse parameters of X/Y servo motors drift, or the timing belt slips due to wear. Re-calibrate the mechanical zero point in the system and tension the timing belt.
Q: The cutting head stops vibrating suddenly while the carriage moves along the track normally.
A: The high-frequency vibration motor driver triggers overheat protection, or the flexible cable connected to the cutting head has internal wire breakage after repeated bending.
3. Band Knife Splitting Machine
Q: Why does the band knife drift back and forth and fail to stay fixed during operation?
A: The eccentric wheel balance block controlling band knife tension and positioning is loose, or oil stains on the drive disc cause slipping. Wipe the drive disc with alcohol and retighten positioning bolts.
Q: The split leather surface shows obvious wavy lines or uneven thickness.
A: The cutting edge of the band knife is worn unevenly; feeding rollers are partially dented or wrapped with leather scraps. Grind the knife with the built-in grinding wheel, clean or replace worn feeding rollers.
Q: The grinding wheel produces heavy sparks but the knife edge remains blunt. How to adjust?
A: The grinding wheel surface is passivated by oil contamination. Dress the wheel surface with a diamond dresser to expose new sharp abrasive grains.
Fully Automatic Hot Melt Cement Folding Machine
Q: The glue pot heats up extremely slowly, or the display still shows an error after reaching the set temperature.
A: The electric heating tube inside the glue pot is burnt and open-circuited, or the thermocouple (temperature sensor) is oxidized by carbon deposits leading to inaccurate temperature measurement.
Q: Why are folded edges uneven in width or wrinkled?
A: The clearance between the folding hammer and feeding wheel is too large; adjust mechanical clearance according to material thickness. The stroke of the pneumatic cutting knife is improperly set, failing to cut holes for loose folding at curved sections.
Q: The glue nozzle is fully clogged after restarting the machine following long shutdown.
A: Hot melt glue carbonizes and forms coke under persistent high temperature. Lower the glue pot temperature before long-term shutdown. If clogged, heat the nozzle and unclog it with fine steel wire plus special cleaning agent.
Roller Feed / Post Bed Sewing Machine
Q: Frequent skipped stitches occur during sewing. What is the inspection sequence?
A: 1. Check if the needle is bent or installed reversely (the needle groove must face the shuttle hook); 2. Verify shuttle hook timing: when the needle bar rises 2mm from the lowest point, the shuttle tip should be 0.8–1.1mm above the needle center line.
Q: Floating stitches appear (tight bottom thread, loose top thread). How to adjust?
A: The tension of the top thread is too low or the bottom thread tension is excessive. Slightly turn the thread tension nut to increase top thread pressure, or adjust the shuttle spring screw to loosen bottom thread tension.
Q: The upper and lower feeding rollers fail to convey material, and leather slips in place.
A: Anti-slip teeth on rollers are worn flat, or air pressure of the presser foot cylinder is insufficient. Increase cylinder air pressure or replace worn rollers.
High-Speed Computerized Pattern Sewing Machine
Q: A loud bang occurs during high-speed operation, the machine locks up and the screen shows "Spindle Locked".
A: Needle collision happens; broken needle fragments jam the shuttle hook, or the shuttle hook seizes due to instantaneous high-speed impact. Disassemble the shuttle hook and clear metal debris.
Q: The sewn pattern is tilted or shrunk after importing a new shoe design file.
A: The format/resolution of the pattern file exported by design software mismatches the machine system; X/Y guide rails lack lubrication causing excessive resistance and servo motor lost steps. Unify file output standards, lubricate guide rails and re-calibrate zero position.
Q: Automatic thread trimming fails, leaving overly long thread ends or complete thread detachment.
A: Cutting edges of moving and fixed trimming knives are dull and cannot cut thick threads; the stroke speed of the trimming cylinder is mismatched with spindle stop timing. Replace trimming knives and adjust cylinder throttle valves for synchronous action.
Fully Automatic Toe Lasting Machine
Q: The pulling claws often tear upper leather during lasting.
A: Air pressure for primary pulling force of claws is set too high; temperature of heating tiles inside claws is over-high and scorches leather. Reduce air pressure and lower the temperature controller value.
Q: After the sweeping arms close, bulges (cat ears) form on both sides of the toe lasting edge.
A: The stroke matching of primary and secondary pressing arms is improper. Adjust the primary pressing to close sweeping arms first, then increase secondary pressing force to flatten leather fully against the insole edge.
Q: Which key positions need adjustment when switching lasts of different sizes?
A: 1. Height of midsole support platform to align with sweeping arm surface; 2. Forward and backward distance of positioning stoppers; 3. Opening range of left and right pulling claws.
