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I. General Technical Parameters:

II. Structures and Features of Machine Tools

A. Structures

The series of machine tools are driven by electromotor  through triangular belt and two pairs of helical-spur gear, bringing the upper working bench to move upwards and downwards through crank eccentricity to achieve the cutting effects, with the length of travel as 64mm (i.e., the maximum thickness which can be cut is 64mm).

B. Features of Machine Tools

a. The series of machine tools is of planer type. The portal-shaped width is available enough for raw materials, such as the whole piece of cloth or a large piece of leather to pass it smoothly. As to cutting for small materials, two cutting dies can be operated at two ends to improve the work efficiency greatly.

b. Both upper and lower working benches, made of magnesium iron materials, are firm and durable, so not damaged under temporary overload.

c. Application of helical cylindrical gearing and sliding copper bearing can generate large carrying capacity with balanced movement and low noise.

d. Adjustment on distance between upper and lower working benches is completed by worm drive, with plane thrust bearing installed so that the adjustment will be flexible and handy.

e. According to calculation, except wallboards with the strength considered and different cross-direction dimensions, slide blocks and upper and lower working benches, main drive shaft, worm and crankshaft, and brace strut, all the series of machine tools are of interchangeable parts, for which repairs are quite convenient

f. Automatic feeding bench can be matched to reduce the labor intensity, ensure operation safety and improve work efficiency.

III. Adjustment and Notice about Machine Tools

A. Adjustment to Machine Tools

   All components have been adjusted before the machine tools leave factory. It is better not to change the relative positions of components easily. Only under the circumstances that die assemblies with different heights are replaced, and that through the operation after a period of time gaps between slide blocks increase because of abrasion, the following adjustment can be done:

   a. Control on the distance between both upper and lower working benches: when die assemblies with different heights are replaced, the corresponding adjustment must be done on the distance between both upper and lower working benches.

b. When crankshaft lies at the position of bottom dead center, the distance between upper and lower working benches H is calculated according to the formula:

H=H1+H2-(1～2)mm

In the formula: H1, height of die assemblies (mm)

             H2, backing plate (mm)

Adjusting steps:

 (1) Belt pulley wheels of transmission shaft are turned by hands so that the crankshaft lies at the position of bottom dead center;

 (2) Stripped nuts on pull rod are loosened and rotated upwards at a certain distance;

 (3) Hand wheels are turned so that the upper working bench will be adjusted upwards or downwards to the required height;

 (4) Round nuts on pull rod are locked

      c. Adjustment to the gap between slide block and guide track of wall plate: After the working in a certain period of time, as the gap between slide block and guide track of wall plate will be enlarged because of abrasion, it must be adjusted to the appropriate height.

Adjusting steps:

 (1) Loosened are nuts of fastening screws on strips at both sides of guide track of wall plate.

        (2) It is appropriate to rotate screws of brackets in order until the gap is proper. (i.e., upon the movement, the standard is taken as that upper working bench is not shaken and moves flexibly upwards and downwards for working.

    B. Notice

                 a. Before the machine tools are operated, it shall be inspected whether all fasteners are firm or not. In case of loosening, they shall be fastened in a timely manner.

     b. The trial run shall be carried out for machine tools. Materials can be input for production after it determines that all parts are normal with no special sound, stuck, and bumping.

     c. Efforts shall be made on that the back and front planes for all die assemblies and backing plate are paralleled. It is advisable to apply die assembly and backing plate in the unified height, so as not to adjust distance between upper and lower working benches usually.

     d. Upon adjustment to the distance between upper and lower working benches, be sure that the crankshaft lie at the position of bottom dead center, or the cutting die will be pressed into the backing plate too deep, even over the plate to cause serious accidents.

     e. After feeding the materials, workers must leave the area of working benches before pressing the switch of electric appliances, particularly when two workers applying the commensurate operation shall pay more attention to the mutual coordination, or the accident will occur that hands are crushed.

IV. Calculation of cutting force

  Theoretical calculation: F=L×D×QCP

            F—blanking force(KN)

            L—Perimeter of cutting die (mm)

            D—Thickness of work piece

            QCP—Shearing strength KN/mm²

   Examples of shearing strength QCP for all varieties of materials follow as:

            Cloth             0.18-0.2 KN/mm²

                                     0.02-0.03 KN/mm²

                               0.02-0.03 KN/mm²

                              0.03 KN/mm²

Hard rubber       0.03 KN/mm²

Hardboard paper          0.05-0.06 KN/mm²

Laminated sheet         0.07-0.08 KN/mm²

Fabroil                0.07-0.11 KN/mm²

Fiberboard (ordinary)      0.12 KN/mm²

            Fiberboard (hard)         0.17 KN/mm²

   As cutting thickness and working pressure do not stand in straight line dependence, the proper choice on cutting thickness largely concerns the improvement on work efficiency. Upon the actual blanking, the blanking thickness also has relations to the sharpness of cutting die, therefore, D (F/L×QCP) may be applied for determination on thickness.

V. Lubrication of Machine Tools

    Sufficient lubrication must be ensured on parts of transmission gears like axial sleeves and bearings to reduce the abrasion. Lubricated parts follow as:

a. As to cover plate with the mark “oil” on two sides of left and right wall plates, workers of each shift must open the cover plate and fill up the oil tank.

   b. Machinery oil (SAE)30 is filled in oil tank.

   c. Calcium (or natrium) lubricating grease is filled in each plane thrust bearing.

d. At connecting-rod big end and drag-link ends there are oil cups which shall often be filled with machinery oil (SAE) 30.

VI. Handling, Installation and Trial Run of Machine Tools

a. Handling: In case of hoist by crane, steel cables must be fastened on the brace struts at two ends of upper working bench, or on the four squares of flat plate.

b. Installation: Before leaving the factory, machine tools haven been in run and checked. As the incorrect installation will influence the precision and service performance and long-term inclination will generate internal stress, do pay attention to that for no sakes of trouble saving, after leveling on the ground with no foundation, under production (Attached Diagram 4) and erection the foundation shall be poured and thumb screws are screwed down evenly with horizontal calibration, then it can be used.

c. Trial run: After machine tools are installed, kerosene is used to clean the working benches and various fine grains of garbage rising from hoist, handling, and installation. Then, lubricant oil is filled into all oil holes. After electromotor is connected with lines, the deb ing trial run can be started. After the operation during a short period of time, the height can be adjusted for production if no special sound occurs

VII. Principles and Controls on Electric Appliances

The system of electric appliances consist of main motor circuit and control circuit.

A.   Main motor circuit:

Electromotor  of the series Y are applied for the circuit. Start-up and stop of main motor is controlled by contactor KM. Thermal relay FR is used for overload protection of electromotor .

B. Control Circuit:

The control circuit can realize three action programs: inching, single action and automation.

   a. Inching

 (1) Option switch SA is put on the “inching” gear.

 (2) “Inching” button SB1 is pressed. Contactor KM is attracted by electricity, thus the electromotor  runs;

 (3) As button SB1 is released, the contactor KM loses the electricity. The electromotor  is stopped;

Inching is done on SB, as well as the electromotor . The inching program is realized on head beam.

   b. Single-time

   (1) Selector switch SA is selected on the gear of “single time”;

   (2) Single-time button SB2 is pressed, so contactor KM is attracted and locked itself. The electromotor  runs to drive the eccentric mechanism so that head beam is pressed down to make the blanking movement. At the lower-limit position, eccentric shaft drives the head beam move upwards. The baffle touches the travel switch SQ, and then contactor KM is powered off so that the self lock is released. As the electromotor  loses electricity, the head beam returns to upper-limit position with the inertia of electromotor .

   c. Automation:

   (1) Selector switch SA is selected on the “automatic” gear

   (2) Single-time button SB2 is pressed, so contactor KM is attracted and locked itself. The electromotor  runs. Eccentric shaft drives the head