Patent Application
20060179991
1. Field of the Invention
This invention relates to a blind cutter, particularly to one possible to cut many different sizes and types of blinds such as vertical blinds and lateral blinds.
2. Description of the Prior Art
There are no special regulations for the sizes of window blinds, so special blind cutters have to be used for each kind of blind having different lengths and width.
Conventional blind cutters are very simple, can cut only one size and also are operated manually without any guide devices or positioning devices, taking much time and work, hardly ensuring the good quality of cut blinds. There is also a conventional cutter using a motor for its power source, cutting with plural knife modules driven synchronously by a pushing device for cutting blinds positioned on each knife module.
However, the conventional electric cutter has a pushing device for the knife of each knife module, and the force exercising point of the pushing device does not constitute a straight line with the force receiving points of all the knives, with different bias distances. So in cutting process, the bias distances may produce twisting torque, which may cause damage to the relative transmitting components of the knife modules and the pushing device, Besides, The knife of each knife module has to be assembled together or taken off the knife base, not designed to form an independent unit. Therefore, in replacing a knife with new one, it must be assembled with the knife base, and adjusted together for correcting the cutting location of the knife, quite inconvenient in handling, in addition to difficulty for ensuring the accuracy of the sizes of cut blinds.
The blind cutter according to the invention includes at least a worktable, a drive device and a number of knife modules. The drive device has a speed-reducing motor for rotating a rotary shaft, which has a number of gears for engaging and moving a number of racks. The knife modules respectively have a module base arranged in a lengthwise line on the worktable, and each module base has a special hole for blind material to pass through, with a knife fitted slidably in each module base and moved laterally together with the racks for cutting blind material placed on the module base.
The key point in the invention is that each knife module is separately moved laterally by gears and racks so that the force exercising point and the force receiving point form a straight line, avoiding happening of twisting torque so that the transmitting structure of the drive device may not be damaged by twisting torque and accordingly the components can have a long service life, ensuring the good quality of finished products, with the knife module possible to be altered with that with other sizes to match with different kinds of blinds.
This invention will be better understood by referring to the accompanying drawings, wherein:
A preferred embodiment of a blind cutter in the present invention, as shown in
The work table 10 is composed of a foot frame 11, a table 12 fixed on a proper location on the upper surface of the foot frame 11, and a module base fixing plate 13 fixed on a proper location on the table 12, as shown in
The drive device 20, as shown in
The pressure absorbing device 30 shown in
The knife module 40 shown in
The two module bases 41, 41 are fixed respectively on an upper and lower surface of the front wall of the vertical plate 131 of the module fixing plate 13 on the work table 10. The upper module base 41 has an upper rod hole 411 matching with the cross-sectional shape of the upper rod of a vertical blind, and the lower module base 41 has an upper-rod hole 412 matching with the cross-section of an upper rod of a lateral blind and a guide slot 413 beside the upper-rod hole 412 for a slide block 415 fitting slidably therein, with the slide block 415 having a lower rod hole 414 matching with the cross-section of the lower rod of a lateral blind. Then the slide block 415 and the upper rod hole 412 define the slide slot 413 between them as a blind-strip slot 416. At the same time, the push member 332 of the pressure absorbing device 30 can fit in the guide block 413 to face the slide block 415, which then receives elastic pressing of the push member 332 before performing cutting.
The two knife bases 42 and 43 are fitted slidably and respectively in the upper and the lower module bases 41, 41, The upper knife base 42 consists of two—one upper and other lower—rail blocks 421, 421 and a position block 422 connected between the two rail blocks 421, 421. The upper and the lower rail blocks 421, 421 are provided with plural threaded holes 423, so the first knife 44 for cutting a vertical-blind upper rod may be fixed by screws with the upper and the lower rail block 421, 421 after placed to contact with the sidewall of the position block 422. The lower knife base 43 consists of two—one upper and the other lower—rail blocks 431. 431 and two position blocks 432, 433 fixed between the two rail blocks 431, 431 so that the second knife 45 for cutting a lateral blind strip may be fixed by screws engaging with the threaded holes 434 of the upper and the lower rail blocks 431, 431 after placed to contact the sidewall of the position block 432. In the same way, the third knife 46 for cutting a lateral blind is fixed by screws engaging with the threaded holes 434 of the upper and the lower rail blocks 431, 431 after placed to contact the sidewall of the position block 433.
The upper and the lower knife bases 42 and 43 are connected firmly with the drive device 20 by the two position blocks 422, 432 fixed with the relative ends of the two racks 24, 24 so that the first, the second and the third knife 44, 45 and 46 may shift along the two module bases 41, 41 laterally for carrying out cutting action against blind material.
The stop device 50 shown in
The belt 52 is driven by the motor 51, rotating the counter 53, which is fixed on one of two vertical plates 541 of the U-shaped frame 54, with the guide rod 55 positioned between the two vertical plates 541, and with the threaded rod 56 extending through the intermediate portion for rotating the counter 53. The position base 57 engages with the threaded rods 56, guided by the upper and the lower guide rods 55, 55 to shift. Then the stop plate 58 is connected firmly with the position base 57, facing the relative location of the upper and the lower module bases 41, 41 and properly pressing the end of the blind material, with the threaded rod 56 adjusting the position of the stop plate 58 to control the exact length of the blind material to be cut off.
The guide device 60, as shown in
The first bracket 61 is composed of two support rods 611, 611 fixed properly on the work table 10, and a support block 612 fixed respectively on the two support rod 611, 611 and provided with a recessed guide groove 613 for receiving, supporting and guiding an upper rod passing through the upper rod hole 411 of the upper module base 41. The second bracket 62 is composed of two bottom blocks 621, 621 fixed properly on the worktable 10, and a U-shaped plate 622 with a guide groove 623 fixed on top of each bottom block 621. The guide groove 623 is for receiving, supporting and guiding the upper rod, blind strips and the lower rod of a lateral blind to pass through the upper rod hole 412, the blind strip hole 416 and the lower rod hole 414 of the lower module base 41
The control case 70 shown in
Next, as shown in
The blind cutter according to the invention has the following advantages.
1. The knife bases 41, 41 and the first, the second and the third knife 44, 45 and 46 of the knife module 40 are moved separately by the two gears 23, 23 and the two racks 24, 24 of the rotary shaft 22, so the three knives 44, 45 and 46 have their cutting force points aligned to the force points of the two gears 23, 23 and the two racks 24, 24 so that the force of the knife module 40 caused by cutting may directly be transmitted to the relative gear 23 and the relative rack 24, preventing twist torque from happening, ensuring that the knife bases 41, 41 and the three knives 44, 45 and 46 together with the two gears 23, 23 and the two racks 24, 24 may not be damaged by twisting torque, with its service life prolonged accordingly.
2. As described above, each knife module 40 is matched with a separate pushing structure, possible to avoid twisting torque or damage unjustifiable, so except changing the knife module 40, the knife module 40 can be increased, with their cutting efficiency and quality able to be maintained as good as possible.
3. As the knife module can be augmented according to necessity, the blind cutter can be made to have various kinds of functions for vertical binds and later blinds common seen, by designing special holes 411, 414 and 416 in the knife modules 40.
4. The three knives 44, 45 and 46 can be assembled and disassembled easily, quickly and accurately to secure smoothness and precision in cutting, without need of adjusting and correction each time after each assembly process, as the three knives 44, 45 and 46 are correctly positioned in the knife bases 42, 42, fixed with the rail blocks 421, 431 and facing the position blocks 422, 432, keeping the cutting direction and the sliding direction definite and correct.
5. The pressure absorbing device 30 man help cutting blinds for maintaining the good quality of finished cut blinds, and prevent them from clamping scars by absorbing pressure and clamping elastically the lower rod 93 and each blind strip 92 for cutting.
6. The cutting operation can be carried out conveniently, quickly and accurately by putting in the value of the length needed for blinds in the faceplate 71 and adjusting the location of the stop plate 58 of the stop device 50.
While the preferred embodiment of the inventin has been described above, it will be recognized and understood that various medications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.
