Double-cutter cutting machine
Technical Field
The invention relates to a sewing machine, in particular to a double-cutter cutting machine for cutting cloth.
Background
In the cloth processing industry, in order to improve production efficiency, multiple layers of cloth raw materials needing to be cut into the same shape are often stacked, a double-knife cutting machine is used for cutting the multiple layers of cloth at one time, a required stack of cloth materials is cut, and the flow process of a subsequent production line is facilitated.
Chinese patent specification CN102002845B discloses a double-blade cutting machine, as shown in fig. 1 and 2, comprising a frame 1, a chassis 2, a motor 3 arranged on the frame 1, a first slide rail mechanism 4a, a second slide rail mechanism 4b, a first ram 5a, a second ram 5b, a first blade 6a, a second blade 6b and a transmission mechanism 7, wherein the first slide rail mechanism 4a and the second slide rail mechanism 4b are fixed on the frame 1, the first ram 5a is slidably arranged on the first slide rail mechanism 4a, one end of the first ram 5a is rotatably connected with the transmission mechanism 7, and the other end is fixedly connected with the first blade 6 a; the second ram 5b is slidably arranged on the second sliding rail mechanism 4b, one end of the second ram 5b is rotatably connected with the transmission mechanism 7, and the other end is fixedly connected with the second blade 6 b; the transmission mechanism 7 is transmitted to the motor 3 and drives the first ram 5a and the second ram 5b to move in opposite directions at the same speed, the first blade 6a and the second blade 6b are parallel and separated from each other, and respective blades are adjacent to a point of action of the cloth, the transmission mechanism 7 includes a main tooth 71, a first slave tooth 72a, a second slave tooth 72b, a first link 73a, and a second link 73b, the main tooth 71 is fixed to an output shaft of the motor 3 and rotates as the motor 3 is driven, tooth surfaces of the first slave tooth 72a and the second slave tooth 72b are oppositely arranged and respectively engaged with both sides of the main tooth 71, a first pivot point 74a for rotatably connecting the first slave tooth 72a to the first link 73a is provided at an eccentric position on the first slave tooth 72a, and a second pivot point 74b for rotatably connecting the second slave tooth 72b to the second link 73b is provided at an eccentric position on the second slave tooth 72b, the first pivot point 74a and the second pivot point 74b are centrosymmetric, and the symmetric center is the middle point of the connecting line of the rotation centers of the first slave bevel gear 72a and the second slave bevel gear 72 b. According to the double-blade cutting machine, the first blade and the second blade move respectively through the first ram and the second ram, the first connecting rod and the second connecting rod, and the first driven bevel gear and the second driven bevel gear are in transmission driving, the structure is complex, the first connecting rod and the second connecting rod are respectively in pin joint connection with the first driven bevel gear and the second driven bevel gear, abrasion is easy to occur, and noise is large.
Disclosure of Invention
The invention aims to provide a double-cutter cutting machine which is simple in structure, low in noise and high in efficiency.
In order to solve the technical problems, the invention adopts the technical scheme that: a double-blade cutting machine comprises a first connecting rod and a second connecting rod which respectively drive a first blade and a second blade to do cutting movement, and a first driven gear and a second driven gear which drive the first connecting rod and the second connecting rod to move; the method is characterized in that: the tooth surfaces of the first driven gear and the second driven gear are arranged in parallel and are eccentrically and fixedly provided with a first sliding block and a second sliding block; the upper ends of the first connecting rod and the second connecting rod are respectively provided with a sliding chute in sliding fit with the first sliding block and the second sliding block, and the lower ends of the first connecting rod and the second connecting rod are respectively detachably and fixedly connected with the first blade and the second blade. Because the one end lug connection of connecting rod is on the blade, and the other end passes through the slider spout and is connected to the gear, simple structure, the noise is little, and transmission efficiency is high.
In order to reduce the friction loss between the sliding blocks and the sliding grooves, as an improvement of the invention, the first sliding block and the second sliding block are respectively sleeved with roller needle bearings.
As an improvement of the invention, a roller pin bushing baffle plate sleeved and buckled on the roller pin bearing is embedded in the sliding groove.
As an improvement of the invention, the cross section of the roller pin bushing baffle is U-shaped.
As an improvement of the present invention, the first slider and the second slider are symmetrically disposed along a midpoint of a central connecting line of the first driven gear and the second driven gear.
As an improvement of the present invention, the first blade and the second blade are respectively connected to the lower ends of the first connecting rod and the second connecting rod by a pin.
As an improvement of the present invention, the first blade and the second blade are respectively connected to lower ends of the first link and the second link by screws.
As a modification of the present invention, the first driven gear and the second driven gear are driven by a driving gear fixed to an output shaft of the motor.
As a modification of the present invention, the first driven gear and the second driven gear are helical gears.
Drawings
Fig. 1 is a schematic view of a detachable structure of a conventional double-blade cutting machine.
Fig. 2 is a schematic perspective view of a conventional double-blade cutting machine.
Fig. 3 is a schematic view of a splitting structure of the double-blade cutting machine provided by the invention.
Fig. 4 is a perspective view of a dual blade cutting machine of the present invention with the housing removed.
Detailed Description
As shown in fig. 3 and 4, the double-blade cutting machine of the present invention comprises a bracket 1, an upper housing 11, a cover plate 12, a driving gear 20, a first driven gear 2a, a second driven gear 2b, a first link 3a, a second link 3b, a first blade 6a, a second blade 6b, a chassis 7, and a motor.
The bracket 1 is connected with the upper shell 11 and the chassis 7 and is used for supporting and protecting the up-and-down cutting movement of the first blade 6a and the second blade 6b, and the connecting mode and the structure can adopt a conventional structure, such as the structure adopted by a double-blade cutting machine in the invention patent specification CN102002845B in the background art.
The upper housing 11 is fixedly connected to the upper part of the bracket 1, one side of the upper housing is provided with a first driven gear 2a and a second driven gear 2b, the first driven gear 2a and the second driven gear 2b are helical cylindrical gears, and the tooth surfaces of the first driven gear 2a and the second driven gear 2b are arranged in parallel, preferably in the same plane; the other side is fixedly provided with a driving motor, the motor comprises a shell 40, a stator 41 and a rotor 42, a driving gear 20 is fixedly arranged on an output shaft of the motor, and a first driven gear 2a and a second driven gear 2b are driven by the driving gear 20. The motor adopts a permanent magnet brushless DC motor, namely a servo motor, the speed of the motor can be controlled by a computer, the motor can be selected according to the requirement by using, and the stable output of power at different rotating speeds can be ensured simultaneously.
A first slide block 21a is eccentrically installed on the tooth surface of the first driven gear 2a, and a roller needle bearing is sleeved on the first slide block 21a and comprises a roller needle 22 and a bearing sleeve 23; correspondingly, a second slide block 21b is eccentrically arranged on the tooth surface of the second driven gear 2b, and the second slide block 21b is also sleeved with a roller needle bearing; the first slider 21a and the second slider 21b are symmetrically disposed along a midpoint of a central line connecting the first driven gear 2a and the second driven gear 2 b.
The upper ends of the first connecting rod 3a and the second connecting rod 3b are respectively provided with a sliding chute 31a and a sliding chute 31b which are matched with the first sliding block 21a and the second sliding block 21b in a sliding way, a roller needle bushing baffle plate 24 which is sleeved and buckled on a roller needle bearing is embedded in the sliding chutes 31a and the sliding chutes 31b, and the cross section of the roller needle bushing baffle plate 24 is U-shaped. Thus, along with the rotation of the first driven gear 2a and the second driven gear 2b, the first slider 21a and the second slider 21b are respectively in sliding fit with the sliding grooves 31a and 31b to drive the first connecting rod 3a and the second connecting rod 3b to move up and down.
The lower ends of the first and second links 3a, 3b are detachably and fixedly connected to the first and second blades 6a, 6b, respectively, in a conventional manner, for example, by means of pins 32 or screws.
The lower end of the upper housing 11 may be provided with a mechanism for guiding the first link 3a and the second link 3b to slide up and down, for example, a linear bearing may be installed on the groove for guiding, or a ram and slide rail mechanism described in the background may be used for guiding in a matching manner, which is not an innovation of the present invention and will not be described in detail herein.
The upper shell 11 is further fixed with a cover plate 12 through screws, and the gear mechanism formed by the driving gear 20, the first driven gear 2a and the second driven gear 2b is wrapped by the upper shell 11 and the cover plate 12 to form a gear box body, so that the gear mechanism is protected.