Blind cutting machine

Details Blind cutting machine Blind cutting machine

1999-07-14

2001-06-05

Peterson, Kenneth E. (Department: 3724)

Cutting

Means to drive or to guide tool

With simple rectilinear reciprocating motion only

C083S636000, C029S024500

Reexamination Certificate

active

06240824

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a blind cutting machine in which the cutting operation is divided into three stages and the upper beam, slat and weight board are sequentially cut into a desired size at one time at the three stages. Therefore, the cutting operation can be performed without great force so that the strength is saved and the manufacturing cost is lowered.
FIGS. 1 and 2
show a conventional blind cutting machine which includes:
a bench assembly
10
including a working bench
11
, a mold seat
12
and several screws
13
, the mold seat
12
being fixed on a left rear side of the working bench
11
and formed with several thread holes
121
;
three blade molds
20
having identical size and profile, one side of each blade mold
20
being formed with a slide channel
21
, the centers of the three blade molds being respectively formed with perforations
22
with different profiles in accordance with the different profiles of the weight board A, slat B and upper beam C, the three blade molds
20
being sequentially locked on the mold seat
12
by the screws
13
;
an oil pressure device
30
including an oil pressure cylinder
31
, a blade seat
32
and a thread rod
33
, the blade seat
32
being fixed at front end of an oil pressure rod of the oil pressure cylinder
31
, a front section of the blade seat
32
being formed with a longitudinal fissure
321
, the thread rod
33
being screwed into one side of the blade seat
32
;
a blade tool
34
which is an elongated plate body formed with two blade perforations
341
, the most forward end of the blade
34
and the right sides of the two blade perforations
341
being respectively formed with blades
342
with different profiles in accordance with the different profiles of the weight board A, slat B and upper beam C, a locking section
343
extending from a rear end of the blade tool
34
, the blade tool
34
being fitted in the slide channels
21
of the three blade molds
20
and fixed on the blade seat
32
at the locking section
343
by the thread rod
33
; and
a restriction mechanism
40
including a restriction bar
41
, a locating screw
42
, a ruler rod
43
, a locating rod
44
and two support members
45
. The restriction bar
41
is formed with three locating recesses
411
. One end of the restriction bar
41
is formed with a polygonal pivot head
412
having a thread hole for the locating screw
42
to screw therein. The ruler rod
43
is marked with scales. Via the pivot head
412
, the restriction bar
41
is pivotally disposed on the ruler rod
43
. The ruler rod
43
and the locating rod
44
are fixedly connected between the two support members
45
.
Referring to
FIG. 2
, in use, the restriction bar
41
of the restriction mechanism
40
is first adjusted to a desired position and located by the locating screw
42
. Then the sections of the weight board A, slat B and upper beam C to be cut are respectively passed through the perforations
22
of the blade molds
20
to engage in the locating recesses
411
of the restriction bar
41
. Then the oil pressure device
30
is activated, making the blade tool
34
fixed thereon move forward. At this time, the blades
342
of the blade tool
34
at one time cut off the sections of the weight board A, slat B and upper beam C passing through the perforations
22
of the blade mold
20
.
The above conventional structure has some shortcomings as follows:
1
. The weight board A, slat B and upper beam C are cut at one time so that the cutting area is larger and the required application force is greater; and
2
. The greater application force necessitates the oil pressure device
30
to drive the blade tool
34
for cutting. This increases the manufacturing cost.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a blind cutting machine in which the cutting operation is divided into three stages and the upper beam, slat and weight board are sequentially cut at one time at the three stages. Therefore, the cutting area is smaller and the cutting operation can be performed without great force so that the strength is saved.
It is a further object of the present invention to provide the above blind cutting machine which has simple structure and can be operated manually without oil pressure device so that the manufacturing cost is lowered.
The present invention can be best understood through the following description and accompanying drawings wherein:


REFERENCES:
patent: 5339716 (1994-08-01), Sands et al.
patent: 5799557 (1998-09-01), Wang
patent: 5806394 (1998-09-01), Marocco
patent: 5816126 (1998-10-01), Pluber
patent: 5927172 (1999-07-01), Wang

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