CN215289232U - Rear thread trimming head mechanism of scroll sewing machine - Google Patents
Rear thread trimming head mechanism of scroll sewing machine Download PDFInfo
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- CN215289232U CN215289232U CN202121593167.5U CN202121593167U CN215289232U CN 215289232 U CN215289232 U CN 215289232U CN 202121593167 U CN202121593167 U CN 202121593167U CN 215289232 U CN215289232 U CN 215289232U
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Abstract
A back thread trimming head mechanism of a scroll sewing machine is provided with a cylinder, a fixed seat, a lifting seat and scissors; the middle part of the scissors is hinged with a bolt used for connecting with the lifting seat; the nut at the end part of the bolt corresponds to the groove of the fixed seat; the fixed seat is connected with the cylinder, and the side surface of the fixed seat is provided with a stop lever for limiting a straight handle of the scissors; the bottom of the lifting seat is provided with a trapezoidal boss connected with a push rod of the cylinder; the cylinder provides power for the scissors to ascend and descend; the groove provides centering restraint and limitation of the lowest descending position when the middle part of the scissors is in the groove; the trapezoidal boss provides centering constraint and limitation of the highest rising position after the middle part of the scissors leaves the groove; the straight handle is inwards folded along with the ascending of the lifting seat due to the limitation of the stop lever, the knife edge is closed, the lifting seat descends and is opened, and the knife edge is opened; the utility model has the advantages of, can cut off the scroll fast accurately and sew up the end of a thread that stays, simple structure moreover, the installation space that needs is little, can not crowd the workspace who accounts for printing, cut, system section of thick bamboo, scroll during operation together.
Description
Technical Field
The utility model relates to a technical field of scroll production facility especially relates to a sewing machine is sewed up to scroll back trimming head mechanism.
Background
The most common banner in real life is an advertisement banner which is pulled at a high place or pasted on a wall to play the roles of advertisement and publicity. The single side of the printing cloth with the red advertisement banner is printed with a white or yellow character or pattern, which is quite striking and very easy to get people's attention; generally, two sides of a scroll are provided with a cylindrical tube which is sewed and used for fixing through a wood stick; in the existing scroll production process, a special scroll machine is used for using scroll cloth and a color ribbon, so that the color ribbon is printed on the scroll cloth to form characters or patterns; finishing printing the scroll; then transferring the printed banner cloth to a cutting machine and a tube making machine for processing; cutting the whole piece of printed banner cloth according to the width of each banner, and sewing the printed banner cloth after the two end parts of the single banner are folded by using a sewing machine to form a cylindrical bobbin; finally, the single scroll after being rolled is transferred to a scroll machine to be rolled into a scroll shape, so that the single scroll is convenient to store and carry; if the printing, cutting, bobbin making and rolling links are put together for work, how to quickly and directly cut off the thread ends of the scroll after the bobbin sewing needs to be considered; in the prior art, chinese patent publication No. CN205669106U, a utility model discloses an automatic thread breakage device of a sewing machine, the disclosure time is 2016.11.02, and discloses an automatic thread breakage device for a sewing machine; the automatic thread cutting device applied to scroll sewing has the following defects: 1. the requirement of scroll sewing is not met; the automatic thread cutting device has a certain distance with the sewing machine body, when the thread is automatically cut, the thread can be cut by the cutting blade only by the transmission device transmitting to the thread cutting gap, and the thread head can not be cut off quickly in time; the automatic wire-breaking device cuts off a connecting wire between two products, and cannot adapt to the cutting off of the connecting wire between two winding drums at two ends of the same scroll; 2. the automatic wire breaking device is complex in structure and occupies a working space when printing, cutting, bobbin making and rolling links are put together for working.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem and providing a back thread trimming head mechanism of a scroll sewing machine.
The technical scheme of the utility model is that: a rear thread end shearing mechanism of a scroll sewing machine comprises an air cylinder, a fixed seat, a lifting seat and a shear from bottom to top in sequence;
the fixed seat is fixedly connected with the air cylinder, and the longitudinal section of the fixed seat is U-shaped; the center of the upper part of the side surface of the fixed seat is provided with a groove; a stop lever which is arranged in an inverted trapezoid manner by taking the groove as the center is arranged between the side surfaces of the fixed seat and is divided into an upper stop lever and a lower stop lever;
the cylinder is provided with a cylinder push rod which is vertically upward; the cylinder push rod passes through the center of the bottom surface of the fixed seat;
the bottom of the lifting seat is a trapezoidal boss and is connected with the end part of a push rod of the air cylinder; the side surface of the lifting seat is provided with a threaded hole corresponding to the groove; the threaded hole is centered relative to the trapezoidal boss; the outer side surface of the lifting seat is attached to the inner wall of the fixed seat;
the middle parts of the scissors are hinged through bolts; the end part of the bolt is connected with a nut matched with the groove; the bolt penetrates through the threaded hole; the scissors are provided with straight handles extending downwards at two sides; the single-side straight handle and the scissor edge form an obtuse angle; the straight handle of unilateral sets up between the last pin of homonymy, lower pin.
Preferably, the fixing seat is fixedly connected with the cylinder through a screw penetrating through the cylinder base from bottom to top.
Preferably, the center of the trapezoid boss is provided with a lower counter bore; the sinking hole is penetrated with a sinking screw which is connected with the end part of the gas rod push rod.
Preferably, the bolt is sleeved with a compression spring; one end of the compression spring is connected with the bolt head, and the other end of the compression spring is connected with the scissors.
Preferably, the side surface of the fixed seat below the bolt head is correspondingly provided with a groove.
Preferably, two air path connecting ports are arranged on the side surface of the cylinder.
Preferably, the outer side surface of the lifting seat is provided with a grease hole.
The utility model has the advantages that: the utility model discloses a back trimming head mechanism of a scroll sewing machine, which is provided with a cylinder, a fixed seat, a lifting seat and a scissor; the middle part of the scissors is hinged with a bolt used for connecting with the lifting seat; the nut at the end part of the bolt corresponds to the groove of the fixed seat; the fixed seat is connected with the cylinder, and the side surface of the fixed seat is provided with a stop lever for limiting a straight handle of the scissors; the bottom of the lifting seat is provided with a trapezoidal boss connected with a push rod of the cylinder; the cylinder provides power for the scissors to ascend and descend; the groove provides centering restraint and limitation of the lowest descending position when the middle part of the scissors is in the groove; the trapezoidal boss provides centering constraint and limitation of the highest rising position after the middle part of the scissors leaves the groove; the straight handle is inwards folded along with the ascending of the lifting seat due to the limitation of the stop lever, the knife edge is closed, the lifting seat descends and is opened, and the knife edge is opened; the utility model has the advantages of, can cut off the scroll fast accurately and sew up the end of a thread that stays, simple structure moreover, the installation space that needs is little, can not crowd the workspace who accounts for printing, cut, system section of thick bamboo, scroll during operation together.
Drawings
FIG. 1 is a first schematic structural view of a rear thread trimming head mechanism of a scroll sewing machine according to the present invention;
FIG. 2 is a second schematic structural view of the rear thread trimming head mechanism of the scroll sewing machine of the present invention;
FIG. 3 is a front partial cross-sectional view of FIG. 1;
FIG. 4 is a third schematic structural view of the rear thread trimming head mechanism of the scroll sewing machine according to the present invention;
FIG. 5 is a front partial cross-sectional view of FIG. 4;
FIG. 6 is a first schematic structural view of the lifting base;
FIG. 7 is a second schematic structural view of the lifting base;
in the figure: 1. the pneumatic cylinder comprises a cylinder, 11, a cylinder push rod, 12, an air passage connecting port, 2, a fixed seat, 21, a groove, 22, a stop lever, 221, an upper stop lever, 222, a lower stop lever, 23, a screw, 3, a lifting seat, 31, a trapezoidal boss, 311, a lower counter bore, 312, a sinking screw, 32, a threaded hole, 33, a grease hole, 4, scissors, 41, a bolt, 411, a compression spring, 412, a bolt head, 42, a nut, 43, a straight handle and 44, and a knife edge.
Detailed Description
Example (b): referring to fig. 1-7, a rear thread trimmer head mechanism of a scroll sewing machine comprises an air cylinder, a fixed seat, a lifting seat and a pair of scissors from bottom to top;
the fixed seat is fixedly connected with the air cylinder, and the longitudinal section of the fixed seat is U-shaped; the center of the upper part of the side surface of the fixed seat is provided with a groove; a stop lever which is arranged in an inverted trapezoid manner by taking the groove as the center is arranged between the side surfaces of the fixed seat and is divided into an upper stop lever and a lower stop lever;
the cylinder is provided with a cylinder push rod which is vertically upward; the cylinder push rod passes through the center of the bottom surface of the fixed seat;
the bottom of the lifting seat is a trapezoidal boss and is connected with the end part of a push rod of the air cylinder; the side surface of the lifting seat is provided with a threaded hole corresponding to the groove; the threaded hole is centered relative to the trapezoidal boss; the outer side surface of the lifting seat is attached to the inner wall of the fixed seat; the cylinder push rod can push the lifting seat to move up and down, and a sliding pair formed between the outer side surface of the lifting seat and the inner wall of the fixed seat plays a role in guiding;
the middle parts of the scissors are hinged through bolts; the middle part of the scissors and the bolt form a revolute pair; the end part of the bolt is connected with a nut matched with the groove; the bolt penetrates through the threaded hole; the nut and the bolt can move up and down along with the lifting seat; the scissors are provided with straight handles extending downwards at two sides; the single-side straight handle and the scissor edge form an obtuse angle; the single-side straight handle is arranged between the upper stop lever and the lower stop lever on the same side; when the lifting seat falls down, the nut is restrained by the groove in the horizontal direction, so that the middle parts of the bolt, the nut and the scissors are centered relative to the fixed seat, and the straight handle can only be opened due to the restraint of the upper stop lever and the lower stop lever, so that the edge of the scissors is opened; when the nut falls to the bottom of the groove, the groove restrains the nut upwards, and the middle part of the scissors falls to the lowest part; when the lifting seat rises, the straight handle is pressed by the push rod of the cylinder, and the trapezoidal boss is attached to the lower edge of the straight handle, so that the edge of the scissors is centered; the straight handle is folded, and the edge of the scissors is closed; no matter the lifting seat rises or falls, the scissors edge is symmetrical about the center of the fixing seat, so that the stability of the scissors for cutting the thread end is ensured.
The fixing seat is fixedly connected with the cylinder through a screw penetrating through the cylinder base from bottom to top, and a gear rod and a lifting seat do not need to be dismounted relative to a screw mounted from top to bottom, so that the dismounting and mounting are convenient.
A lower counter bore is arranged in the center of the trapezoid boss; a sinking screw penetrates through the sinking hole and is connected with the end part of the air rod push rod; the matching of the lower counter bore and the sinking screw ensures the detachable installation of the lifting seat and the cylinder push rod and avoids the interference on the opening and closing of the scissors.
The bolt is sleeved with a compression spring; one end of the compression spring is connected with the bolt head, and the other end of the compression spring is connected with the scissors, so that the edge of the scissors is always in a close fit state, and the effectiveness of the edge of the scissors in cutting off the thread head is ensured.
The side face of the fixed seat below the bolt head is correspondingly provided with a groove, so that the two sides of the fixed seat are simultaneously provided with centering constraint on the middle part of the scissors and limitation on the lowest descending position of the lifting seat when the lifting seat falls down.
The side surface of the cylinder is provided with two gas circuit connectors which are connected with a gas source and a gas exhaust pipeline.
The outer side surface of the lifting seat is provided with a grease hole, and stored grease overflows to the lifting seat and the fixed sliding auxiliary surface when the lifting seat moves up and down, so that friction is reduced.
The utility model discloses a use:
in the initial state, the nut and the bolt head fall at the bottom of the groove, the middle part of the scissors is centered, the straight handle is separated from the trapezoidal boss and is restrained by the upper stop lever and the lower stop lever to be in an open state, and the edge of the scissors is also called as the open state;
in the ascending process of the lifting seat, the air cylinder push rod pushes the lifting seat upwards, so that the middle part of the scissors ascends along the groove; before the middle part of the scissors leaves the groove, the middle part of the scissors is restrained and centered by the groove; when the middle part of the scissors is about to leave the groove, the trapezoidal lug is in line contact with the lower edge of the straight handle to replace the groove to restrain the middle part of the scissors from being centered; no matter the middle part of the scissors leaves the front and the back of the groove, the straight handle is folded inwards due to the limitation of the blocking rod in the ascending process of the lifting seat, and the scissors edge tends to be closed; when the trapezoidal convex block is gradually contacted with the lower side of the straight handle in the close contact surface, the lifting seat rises to the highest position, the edge of the scissors is closed, and the thread end left by sewing the scroll is cut off;
in the descending process of the lifting seat, the air cylinder push rod retracts the lifting seat downwards, and the middle part of the scissors descends along with the descending process; before entering the groove, the middle part of the scissors is restrained and centered by the trapezoidal bump; after entering the groove, the middle part of the scissors is restrained and centered by the groove; when the nut falls to the bottom of the groove, the middle part of the scissors is limited by the upward direction of the groove to stay; this position is also the lowest position where the lifting seat can descend; during the descending process of the lifting seat, the cutting edge of the scissors is changed from being closed to being opened.
Claims (7)
1. A back thread trimming head mechanism of a scroll sewing machine is characterized by comprising an air cylinder, a fixed seat, a lifting seat and a pair of scissors from bottom to top in sequence;
the fixed seat is fixedly connected with the air cylinder, and the longitudinal section of the fixed seat is U-shaped; the center of the upper part of the side surface of the fixed seat is provided with a groove; a stop lever which is arranged in an inverted trapezoid manner by taking the groove as the center is arranged between the side surfaces of the fixed seat and is divided into an upper stop lever and a lower stop lever;
the cylinder is provided with a cylinder push rod which is vertically upward; the cylinder push rod passes through the center of the bottom surface of the fixed seat;
the bottom of the lifting seat is a trapezoidal boss and is connected with the end part of a push rod of the air cylinder; the side surface of the lifting seat is provided with a threaded hole corresponding to the groove; the threaded hole is centered relative to the trapezoidal boss; the outer side surface of the lifting seat is attached to the inner wall of the fixed seat;
the middle parts of the scissors are hinged through bolts; the end part of the bolt is connected with a nut matched with the groove; the bolt penetrates through the threaded hole; the scissors are provided with straight handles extending downwards at two sides; the single-side straight handle and the scissor edge form an obtuse angle; the straight handle of unilateral sets up between the last pin of homonymy, lower pin.
2. The mechanism of claim 1, wherein: the fixing seat is fixedly connected with the cylinder through a screw penetrating through the cylinder base from bottom to top.
3. The mechanism of claim 1, wherein: a lower counter bore is arranged in the center of the trapezoid boss; the sinking hole is penetrated with a sinking screw which is connected with the end part of the gas rod push rod.
4. The mechanism of claim 1, wherein: the bolt is sleeved with a compression spring; one end of the compression spring is connected with the bolt head, and the other end of the compression spring is connected with the scissors.
5. The mechanism of claim 4, wherein: the side surface of the fixed seat below the bolt head is correspondingly provided with a groove.
6. The mechanism of claim 1, wherein: two air path connecting ports are arranged on the side surface of the cylinder.
7. The mechanism of claim 1, wherein: the outer side surface of the lifting seat is provided with a grease hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121593167.5U CN215289232U (en) | 2021-07-14 | 2021-07-14 | Rear thread trimming head mechanism of scroll sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121593167.5U CN215289232U (en) | 2021-07-14 | 2021-07-14 | Rear thread trimming head mechanism of scroll sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215289232U true CN215289232U (en) | 2021-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121593167.5U Active CN215289232U (en) | 2021-07-14 | 2021-07-14 | Rear thread trimming head mechanism of scroll sewing machine |
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| Country | Link |
|---|---|
| CN (1) | CN215289232U (en) |
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2021
- 2021-07-14 CN CN202121593167.5U patent/CN215289232U/en active Active
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