What is claimed:
1. Method for manufacturing a crossbeam (2, 2) for a heddle frame (1) of a loom, said crossbeam (2, 2) comprising at least one support section (3, 3) and at least one heddle-support rod (4, 4) affixed to said support section (3, 3) along a junction zone (40, 40), wherein one uses a rigid model (7) comprising at least one first rectilinear groove (70) having a width substantially equal to that of the heddle-support rod (4, 4); one positions the heddle-support rod (4, 4) in said groove (70) to make it rectilinear; one lays a glue line in the junction zone (40, 40); one positions said support section (3, 3) on said model (7) and on the heddle-support rod (4, 4) in a predetermined manner and without stress by flattening said glue line; and one maintains the support section (3, 3) and heddle-support rod (4, 4) assembly affixed to said model (7), at least while said glue is setting.
2. Method according to claim 1, wherein said model (7) and said support section (3, 3) comprise complementary nesting shapes arranged to position the support section (3, 3) accurately with respect to the heddle-support rod (4, 4).
3. Method according to claim 2, wherein the support section (3, 3) has at least a substantially rectangular cross-section (30), and wherein the model (7) comprises a second groove (71) whose ends at least are rectilinear and parallel to the first groove (70), this second groove (71) being arranged to receive said substantially rectangular cross-section (30) of the support section (3, 3).
4. Method according to claim 3, wherein the support section (3, 3) is non-rectilinear, the second groove (71) of said model (7) having a width greater than the total width of the substantially rectangular cross-section (30) of said support section (3, 3), wherein one uses positioning members (9) adapted to be mounted at the ends of said support section (3, 3), these positioning members (9) having a width substantially equal to that of the ends of said second groove (71).
5. Method according to claim 1, wherein, in order to manufacture a number n of crossbeams (2, 2), one uses a number n of models (7), each model (7) being superimposed on the previous one after having positioned the corresponding heddle-support rod (4, 4), glue line and support section (3, 3), and wherein one maintains the assembly of n support sections (3, 3) and of n heddle-support rods (4, 4) affixed to the superimposed n models (7), at least while said glue is setting.
6. Crossbeam (2, 2) for a heddle frame (1) of a loom obtained by the manufacturing method according to claim 1, said crossbeam (2, 2) comprising at least one support section (3, 3) and at least one heddle-support rod (4, 4) affixed to said support section (3, 3) along a junction zone (40, 40), wherein the support section (3, 3) is rigid, wherein the heddle-support rod (4, 4) is non-rigid, and wherein the heddle-support rod (4, 4) is solidly affixed to said support section (3, 3) by gluing in a rectilinear position obtained by means of a model (7) arranged to maintain said heddle-support rod (4, 4) with respect to said support section (3, 3) in this rectilinear position, at least while said glue is setting.
7. Crossbeam according to claim 6, wherein the support section (3, 3) is a non-rectilinear section.
8. Crossbeam according to claim 7, wherein the support section (3, 3) is made of composite materials.
9. Crossbeam according to claim 8, wherein the support section (3, 3) is obtained by a method selected from the group including at least extrusion, pultrusion.
10. Crossbeam according to claim 6, wherein the support section (3) has a substantially rectangular cross-section (30) extend by a substantially straight section (31) adapted to receive said heddle-support rod (4).
11. Crossbeam according to claim 6, wherein the support section (3) has a substantially rectangular cross-section (30) and comprises a longitudinal groove (33) adapted to receive said heddle-support rod (4).
12. Crossbeam according to claim 6, wherein the heddle-support rod (4, 4) is metallic.
13. Crossbeam according to claim 6, wherein the heddle-support rod (4, 4) has a cross-section selected from the group comprising at least a T-shape, a J-shape.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for correcting a mold clamping force in a mold clamping apparatus wherein the mold clamping apparatus includes a spring-built-in mold lying between a movable half mold and a stationary half mold, and in which a variation in the mold clamping force, during a production operation, is detected and the mold clamping force is corrected on the basis of the detected variation, and wherein
a work load accompanying high-pressure mold clamping of a mold clamping process is used as the variation, which comprises:
presetting work load as a standard (standard work load) accompanying high-pressure mold clamping,
detecting the work load accompanying high-pressure mold clamping of the mold clamping process (detection work load) during production, and
correcting the mold clamping force on the basis of a deviation of the standard work load from the detected work load, wherein the work load is ascertained by integrating the magnitude of load in a high-pressure mold clamping section from a high-pressure mold clamping switching position, which is a preset unchanged position, where the high-pressure mold clamping is started, to a mold clamping completion position in a mold clamping process, in which high-speed mold clamping, low-pressure, low-speed mold clamping and high-pressure mold clamping are sequentially performed over mold position or time,
wherein a torque value accompanying high-pressure mold clamping is used as magnitude of the load.
2. The mold clamping force correction method for a mold clamping apparatus according to claim 1,
wherein a pulse number of encoder pulse obtained from a rotary encoder detecting the revolution of a mold clamping servo motor is used to determine the mold position.
3. The mold clamping force correction method for a mold clamping apparatus according to claim 1,
wherein the standard work load is found by averaging the work load obtained from multiple shots.
4. The mold clamping force correction method for a mold clamping apparatus according to claim 1,
wherein the detection work load is found by averaging the work load obtained from multiple shots.
5. The mold clamping force correction method for a mold clamping apparatus according to claim 1,
wherein an allowable range is established for the deviation, and the correction is accomplished if the deviation falls beyond the allowable range.
6. The mold clamping force correction method for a mold clamping apparatus according to claim 5,
wherein the deviation is continuously found multiple times, and the correction is accomplished if the found deviations continuously fall beyond the allowable range.
7. The mold clamping force correction method for a mold clamping apparatus according to claim 1,
wherein a pressure-bearing platen is moved by drive controlling a mold-thickness adjustment motor in a direction of eliminating the deviation, and the mold-thickness adjustment motor is stop controlled if the pressure-bearing platen is moved to a target position for eliminating the deviation.
8. The mold clamping force correction method for a mold clamping apparatus according to claim 1,
wherein the mold clamping apparatus is provided with an injection molding machine.