US 12,434,500 B2
Stapling unit with an improved stitching head drive apparatus
Udaykumar Chhabildas Patel, Gujarat (IN)
Appl. No. 18/722,338
Filed by Udaykumar Chhabildas Patel, Gujarat (IN)
PCT Filed Dec. 19, 2022, PCT No. PCT/IN2022/051096
§ 371(c)(1), (2) Date Jun. 20, 2024,
PCT Pub. No. WO2023/119319, PCT Pub. Date Jun. 29, 2023.
Claims priority of application No. 202121059471 (IN), filed on Dec. 20, 2021.
Prior Publication US 2025/0083466 A1, Mar. 13, 2025
Int. Cl. B42B 4/02 (2006.01); B42B 2/02 (2006.01)
CPC B42B 4/02 (2013.01) 7 Claims
OG exemplary drawing
 
1. A stapling unit with an improved stitching head drive apparatus, the stapling unit comprising:
a frame having at least two plates spaced apart, the at least two plates comprising a first plate and a second plate;
a plurality of linearly arranged rotatable wire spools supported by the frame;
a plurality of stitching heads linearly arranged between the at least two plates, a plurality of wires extending from the rotatable wire spools threaded therein;
a stitching head shaft secured between the at least two plates and configured to operate the plurality of stitching heads through a stitching head lever and a connecting link;
a stitching clincher assembly disposed on an opposite side of the stitching heads to support a plurality of sheets and a stitching head drive apparatus located on either side of the first plate for driving the plurality of stitching heads;
the stitching head drive apparatus comprises:
a toggle lever, a driving lever and a pivot lever, the pivot lever releasably coupled with the driving lever through the toggle lever, the driving lever rigidly keyed with the stitching head shaft;
a lever operating device;
a toggle release lever comprising a first end and a second end, the toggle release lever operatively connected with the lever operating device at the first end and connected to the toggle lever at the second end;
a cam drive configured to operate the pivot lever through a link;
the lever operating device configured to push the toggle release lever to open the toggle lever; and
the toggle lever configured to open and close through the toggle release lever; the toggle lever engageable with the driving lever and the pivot lever in a closed state and an open state, respectively.