CN101724988B - Sewing machine - Google Patents
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- CN101724988B CN101724988B CN 200810173226 CN200810173226A CN101724988B CN 101724988 B CN101724988 B CN 101724988B CN 200810173226 CN200810173226 CN 200810173226 CN 200810173226 A CN200810173226 A CN 200810173226A CN 101724988 B CN101724988 B CN 101724988B
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Abstract
The invention provides a sewing machine which can prevent cloth clamping caused by the cloth presser when power is cut off. The sewing machine comprises a cloth presser (11) for retaining the cloth, a supporting mechanism (20) for hoisting and descending to support the cloth presser, a first cylinder (30) as the hoisting and descending drive source of the cloth presser and a first pressure circuit (60) which is provided with a first electromagnetic valve (40) and an opening unit (90), wherein the first electromagnetic valve (40) can be switched to the position, which causes one of the hoisting side air chamber (31) and the descending air chamber (32) to be in pressure supply state and the other in opening-to-atmosphere state, or vice versa, and the opening unit (90) causes the air chamber supplying pressure in the cloth presser hoisting side air chamber and the descending air chamber of the first cylinder to switch to the opening-to-atmosphere state when the drive power source of the first electromagnetic valve is cut off.
Description
Technical field
The present invention relates to a kind of sewing machine, it utilizes the lifting action of air cylinder driven cloth pressing.
Background technology
Current, for example as described in the JP 2007-209663 communique, known a kind of sewing machine, it has: cloth pressing, its upper surface utilization pressing force downwards at needle plate is that cloth compresses with sewn object; Cloth feeding platform, it liftably supports cloth pressing; Cylinder, it is as the drive source of the lifting action of cloth pressing; 5 mouthfuls of electromagnetically operated valves, it is arranged between cylinder and the pneumatic supply; And control circuit, it controls this 5 mouthfuls of electromagnetically operated valves.
Above-mentioned cylinder has cloth pressing is applied the air chamber of down maneuver and applies the air chamber of vertical motion.
In addition, if the connection between pneumatic supply and each air chamber is then controlled in 5 mouthfuls of instructions that electromagnetically operated valve is switched on or switched off from control circuit.Namely, become in the situation of the state of removing the cloth maintenance promoting cloth pressing, by receive the instruction of connecting from control circuit, 5 mouthfuls of electromagnetically operated valves are connected pneumatic supply with the air chamber that cloth pressing is risen, the air chamber of cloth pressing decline and exhaust outlet will be formed by connecting as to the atmosphere opening state.And,, cloth pressing becomes the cloth hold mode in the situation that being descended, by receive the instruction that disconnects from control circuit, 5 mouthfuls of electromagnetically operated valves are connected pneumatic supply with the air chamber that cloth pressing is descended, the air chamber of cloth pressing rising and exhaust outlet will be formed by connecting as to the atmosphere opening state.
Patent documentation 1 JP 2007-209663 communique
Summary of the invention
But, the electromagnetically operated valve that in above-mentioned existing sewing machine, uses, because it is configured to, position sustainable utilization spring in two positions or guide (pilot) pressure pretension, and maintenance is switched by actuators such as solenoids in another position, so if because of such as having a power failure etc. former thereby main power source is cut off, then the power of actuator is broken off, utilize the pretension of spring or pilot pressure and be fixed to a position.For example, in the situation of the position of aforementioned open command, cloth pressing becomes the decline state, can't make its rising under this state, if cloth etc. is sandwiched by cloth pressing, then appears at the problem that main power source can't take out before recovering.
In addition, electromagnetically operated valve in the situation that during dump with cloth pressing to the lifting position pretension, the cloth pressing automatic-ascending if main power source is cut off, can be configured in cloth pressing around outside the movable agency butt or conflict, the problems such as part are damaged.Therefore, electromagnetically operated valve can not be set as in advance the position that cloth pressing is risen.
And, when main power source cuts off, if switch the total valve of pneumatic supply, the pneumatic circuit of cylinder side is open, the pushing force that is then produced by cylinder disappears, and can solve cloth and sandwich problem, but under sewing machine has the situation of other cylinder as the movable agency of drive source, this movable agency also becomes open state, the state in the time of can't keeping the air pressure supply.In this case, there is following problems, namely, because of the state of keeping before can't keeping, so after recovering, main power source can't restart to make, in addition, and because some movable agencies can't be kept attitude, if so recover original attitude after main power source recovers, then can produce interference between the mechanism or conflict and damage.Therefore, the total valve of opening pneumatic supply is also had any problem.
The object of the invention is to, when dump, avoid being sandwiched by the cloth that cloth pressing causes, make simultaneously in the action of other movable agency also can not have problems.
1 described invention is a kind of sewing machine according to technical scheme, and it has:
Supporting mechanism, it liftably supports for the cloth pressing that keeps cloth; And
The first pneumatic circuit, it has: the first cylinder, it has makes cloth pressing the uplifted side air chamber that rises and the decline side air chamber that makes its decline; And first electromagnetically operated valve, it is changeable to be following position, namely, make aforementioned uplifted side air chamber become the air pressure supply condition and make aforementioned decline side air chamber become to the primary importance of atmosphere opening state and make aforementioned uplifted side air chamber become to the atmosphere opening state and make aforementioned decline side air chamber become the second place of air pressure supply condition
It is characterized in that,
Aforementioned the first pneumatic circuit has open cell, when it cuts off at the driving power to aforementioned the first electromagnetically operated valve, originally be not supplied among aforementioned uplifted side air chamber and the decline side air chamber in the air chamber of air pressure and supply with air pressure, and both are all become to the atmosphere opening state.
According to technical scheme 2 described inventions, it is characterized in that having the structure same with technical scheme 1 described invention, have simultaneously:
Other operating mechanism, it carries out the action outside the lifting of aforementioned cloth pressing; And
The second pneumatic circuit, it uses the pneumatic supply be connected with aforementioned open cell, has: the second cylinder, itself and aforementioned other operating mechanism's link; And second electromagnetically operated valve, it is changeable to be following position, that is, make an air chamber of this second cylinder become the air pressure supply condition and make another air chamber become to the 4th position of atmosphere opening state and make an air chamber become to the atmosphere opening state and make another air chamber become the 5th position of air pressure supply condition.
According to technical scheme 3 described inventions, it is characterized in that, have the structure same with technical scheme 1 or 2 described inventions, aforementioned open cell has security solenoid valve, it is arranged between aforementioned the first electromagnetically operated valve and the pneumatic supply, changeablely supply with the state of air pressure and make the first electromagnetically operated valve to the state of atmosphere opening to this first electromagnetically operated valve
Aforementioned open cell is switched aforementioned security solenoid valve when driving power cuts off, so that aforementioned the first electromagnetically operated valve becomes to the atmosphere opening state.
According to technical scheme 4 described inventions, it is characterized in that, have the structure same with technical scheme 1 or 2 described inventions, aforementioned the first electromagnetically operated valve is changeable for aforementioned primary importance, the aforementioned second place and make two air chambers all become the 3rd position to the atmosphere opening state
Aforementioned open cell when driving power cuts off, switches to aforementioned the first electromagnetically operated valve and makes two air chambers all become the 6th position to the atmosphere opening state.
The effect of invention
According to technical scheme 1 described invention, the open cell of the first pneumatic circuit, such as because have a power failure waiting when causing cutting off to the driving power of the first electromagnetically operated valve, the air chamber of supplying with air pressure in the air chamber of the cloth pressing uplifted side by making the first cylinder and the air chamber of decline side becomes to the atmosphere opening state, thereby cloth pressing does not all bear from the first cylinder in optional position up and down and keeps pressing, become the state that utilizes deadweight to descend, avoid the interference with other mechanism, even in the cloth pressing that descends, sandwich cloth etc. simultaneously, be to utilize deadweight and descend only, therefore can easily remove the cloth that sandwiches because pressing.
In addition, do not open each cylinder because do not need to switch the total valve of pneumatic supply, even so exist in the situation of other mechanism that shares pneumatic supply, also can make other mechanism continue to keep the state of being kept by air pressure, thereby making after main power source is recovered restarts to become easily, can avoid interference or conflict between the mechanism.
According to technical scheme 2 described inventions, because there is the second pneumatic circuit that shares pneumatic supply, the actuator that is connected with this second pneumatic circuit can continue to keep the state of being kept by air pressure, so can be according to mechanism or use, the state of the cylinder when selecting main power source to cut off is some in atmosphere opening state and the air supply state.
According to technical scheme 3 described inventions, because utilize security solenoid valve that the first electromagnetically operated valve is become to the atmosphere opening state, so by in existing pneumatic circuit, appending security solenoid valve, thereby can easily obtain pneumatic circuit of the present invention, can realize applying in a flexible way of existing resource thus, can realize simultaneously transforming or the reduction of production cost.
According to technical scheme 4 described inventions, because the first electromagnetically operated valve also has two air chambers of the first cylinder are all become to the position of atmosphere opening state, therefore can reduce be used to the components number that makes the first cylinder to atmosphere opening, can realize the raising of production efficiency.
Description of drawings
Fig. 1 is that expression is as the summary construction diagram of the primary structure of the sewing machine of the first execution mode of the present invention.
Fig. 2 is the amplification assumption diagram of the first pneumatic circuit, represents that the first electromagnetically operated valve is positioned at the state of initial position.
Fig. 3 is the amplification assumption diagram of the first pneumatic circuit, represents that the first electromagnetically operated valve is positioned at the state of service position.
Fig. 4 is the amplification assumption diagram of the first pneumatic circuit, represents that the first electromagnetically operated valve and security solenoid valve are positioned at the state of initial position.
Fig. 5 is that expression is as the summary construction diagram of the primary structure of the sewing machine of the second execution mode of the present invention.
Fig. 6 is the amplification assumption diagram of the second pneumatic circuit, represents that the second electromagnetically operated valve is positioned at the state of initial position.
Fig. 7 is the amplification assumption diagram of the second pneumatic circuit, represents that the second electromagnetically operated valve is positioned at the state of the first service position.
Fig. 8 is the amplification assumption diagram of the second pneumatic circuit, represents that the second electromagnetically operated valve is positioned at the state of the second service position.
Fig. 9 is that expression is as the summary construction diagram of the primary structure of the sewing machine of the 3rd execution mode of the present invention.
Embodiment
(schematic configuration of the first execution mode)
Below, at length describe for the sewing machine 10 as the first execution mode of the present invention.Fig. 1 is the summary construction diagram of the primary structure of expression sewing machine 10.
Sewing machine 10 has: the suture needle reciprocating mechanism, and it carries out moving up and down of suture needle; Container mechanism, it makes the winding of reaching the standard grade and roll off the production line below needle downing position; Frame, it supports these mechanisms; Cloth pressing 11, it is at the upside that is arranged at the needle plate 12 on the frame, and carrying out sewn object is the maintenance of cloth C; Supporting mechanism 20, it liftably supports cloth pressing 11; The first pneumatic circuit 60, it applies lifting action to cloth pressing 11; And control circuit 90, it controls above-mentioned each structure.
In addition, for above-mentioned suture needle reciprocating mechanism, container mechanism, frame, since identical with known structure, so omit detailed explanation.
(cloth pressing and supporting mechanism)
Cloth pressing 11 is at the needle plate upside that is arranged on the sewing machine base section upper surface of frame, and is liftably supported by supporting mechanism 20, presses and maintenance to needle plate 12 thrusters by lower general who has surrendered's cloth, by rising cloth decontroled from hold mode.
Supporting mechanism 20 is disposed at the top of needle plate 12, and it has: pedestal 21, and it can slide up and down to support cloth pressing 11; And bell crank 22, the first cylinder 30 of one end and the first pneumatic circuit 60 links, and carries out rotational action by the other end, and cloth pressing 11 is applied lifting action.This bell crank 22 utilizes the forward motion of the first cylinder 30 that cloth pressing 11 is descended, and utilizes its backward movement that cloth pressing 11 is risen.
(the first pneumatic circuit)
In Fig. 2 and Fig. 3, the first pneumatic circuit 60 is described.In addition, Fig. 2 represents that the first electromagnetically operated valve 40 described later is positioned at the state of initial position (power supply disconnection), and Fig. 3 represents to be positioned at the state of service position.
The first pneumatic circuit 60 has: the first cylinder 30, and it becomes the lifting drive source of cloth pressing 11; The first electromagnetically operated valve 40, it is changeable to be following position, namely, make the cloth pressing uplifted side air chamber 31 of this first cylinder 30 and the some air pressure supply conditions that becomes in the decline side air chamber 32, and another is become to the position of atmosphere opening state, and make one to become to the atmosphere opening state, and make another become the position of air pressure supply condition; And security solenoid valve 50, it is arranged between the first cylinder 30 and the pneumatic supply 61.
The first cylinder 30 is the cylinders that have the first and second air chambers 31,32 double action type in the piston both sides of inside.This first cylinder 30, if supply with air pressure from the air scoop of the first air chamber 31, then piston retreats, and cloth pressing 11 is applied vertical motion.And if supply with air pressure from the air scoop of air chamber 32, then piston-advance applies down maneuver to cloth pressing 11.
The first electromagnetically operated valve 40 is 25 mouthfuls of valves that can switch between initial position and service position, has the first～the 5th air scoop 41～45.
In addition, the first electromagnetically operated valve 40 is to be used for the type pilot that switch the position with pressing from the supply of pneumatic supply 61, has o 46, and its supply that will usually apply to the initial position side presses to the service position side and switches.That is, this o 46 when the signal that sends from control circuit 90 is disconnection, becomes the state that applies the supply pressure to the initial position side, when connection signal, becomes the state that applies the supply pressure to the service position.
And the first electromagnetically operated valve 40 when initial position (valve right side), is communicated with the first air scoop 41 and the 3rd air scoop 43 as shown in Figure 2, the second air scoop 42 and the 4th air scoop 44 is communicated with, with the 5th air scoop 45 obturations.And, as shown in Figure 3,, the first air scoop 41 and the 4th air scoop 44 are communicated with when (valve left side) in the service position, the second air scoop 42 and the 5th air scoop 45 are communicated with, with the 3rd air scoop 43 obturations.
Further specify each air scoop 41～45 of the first electromagnetically operated valve 40 and the connection status between the outside, such as Fig. 2, shown in Figure 3, for this first electromagnetically operated valve 40, the first air chamber 31 that connects the first cylinder 30 at the first air scoop 41, the second air chamber 32 that connects the first cylinder 30 at the second air scoop 42, on the 3rd air scoop 43, be not formed by connecting whatever as to the atmosphere opening state, on the 4th air scoop 44, connect pneumatic supplies 61 via security solenoid valve 50, on the 5th air scoop 45, be not formed by connecting whatever as to the atmosphere opening state.
Therefore, in the situation that be positioned at the service position as prerequisite with security solenoid valve 50, when the first electromagnetically operated valve 40 is positioned at initial position (second place, off-state), the second air chamber 32 to the first cylinder 30 is supplied with air pressure and piston-advance, cloth pressing 11 is applied the locomotivity of decline.In addition, when the first electromagnetically operated valve 40 is positioned at service position (primary importance, on-state), supply with air pressure and piston retreats to the first air chamber 31 of the first cylinder 30, cloth pressing 11 is applied the locomotivity of rising.
Represented that in Fig. 4 the first electromagnetically operated valve 40 is positioned at initial position (off-state), security solenoid valve is positioned at the situation of initial position (off-state).
Such as Fig. 2～shown in Figure 4, security solenoid valve 50 is 23 mouthfuls of valves that can switch between initial position and service position, has the first～the 3rd air scoop 51～53.
In addition, security solenoid valve 50 has the o 54 that switches to the service position, and it utilizes spring to continue to the initial position pretension.That is, this o 54 when power supply disconnects, is kept initial position in order not produce output by spring, when power connection, and antagonistic spring and switching to the service position.
And security solenoid valve 50 on initial position (valve right side), is communicated with the first air scoop 51 and the 3rd air scoop 53, with the second air scoop 52 obturations as shown in Figure 4.
And, as shown in Figure 2, in the service position (valve left side), the first air scoop 51 and the second air scoop 52 are communicated with, with the 3rd air scoop 53 obturations.
Further specify each air scoop 51～53 of security solenoid valve 50 and the connection status between the outside, as shown in Figure 4, for this security solenoid valve 50, the 4th air scoop 44 that connects the first electromagnetically operated valve 40 at the first air scoop 51, connect pneumatic supplies 61 at the second air scoop 52, on the 3rd air scoop 53, be not formed by connecting whatever as to the atmosphere opening state.
Therefore, when security solenoid valve 50 is positioned at on-state service position (on-state), such as Fig. 2 or shown in Figure 3, pneumatic supply 61 is connected with the first electromagnetically operated valve 40, supplies with air pressure to first or second air chamber 31,32 of the first cylinder 30.
And, when security solenoid valve 50 is positioned at initial position (off-state), as shown in Figure 4, pneumatic supply 61 is become state from air pressure to any part that do not supply with by obturation, and to atmosphere opening, two air chambers 31,32 that make the first cylinder 30 are to atmosphere opening and cloth pressing 11 is not applied up or down power via the first and the 3rd air scoop 51,53 of security solenoid valve 50 for the 4th air scoop 44 that makes the first electromagnetically operated valve 40.Therefore cloth pressing 11 becomes the state that utilizes deadweight and descend.
(control unit)
Control circuit 90 on the basis of the function of the control action that carries out sewing machine integral body, is implemented the first electromagnetically operated valve 40 of the first pneumatic circuit 60 and the action control of security solenoid valve 50.
In control circuit 90, be provided with simultaneously: operating pedal 92, it is for the input of the operation of the decline of carrying out cloth pressing 11 and rising; And power circuit 93, its power supply that carries out the each several part in the sewing machine 10 is supplied with.
And, control circuit 90 carries out following control, namely, when utilizing the rising of operating pedal 92 input cloth pressings 11, output makes the first electromagnetically operated valve 40 become the connection signal of on-state, when utilizing the decline of operating pedal 92 input cloth pressings, stop the output for the connection signal of the first electromagnetically operated valve 40.Thus, when the rising input of operating pedal 92, the action that cloth pressing 11 utilizes air pressure to rise, when the decline input of operating pedal 92, the action that cloth pressing 11 utilizes air pressure to descend.
In addition, in control circuit 90, have main power source and cut off testing circuit 91, it detects the generation of the dump state in the power circuit 93.And, control circuit 90 carries out following action control, namely, when not detecting the dump of power circuit 93 by main power source cut-out testing circuit 91, input makes security solenoid valve 50 become the connection signal of on-state, when detecting the dump of power circuit 93 by main power source cut-out testing circuit 91, end the output of connection signal.Thus, when main power source is connected, become the some air chambers 31 to the first cylinder 30, the state of 32 supply air pressure, when main power source cuts off, do not supply with air pressure to any air chamber 31,32 of the first cylinder 30, and become to the atmosphere opening state.
Therefore, control circuit 90 works as open cell.
(action specification of the cloth pressing of sewing machine)
Below, the action of the cloth pressing 11 of the sewing machine 10 that is made of said structure is described.
At first, if the main power source of the power circuit of sewing machine 93 is switched on, then main power source cuts off testing circuit 91 and detects this situation, and control circuit 90 makes security solenoid valve 50 become on-state.Thus, security solenoid valve 50 maintains the service position, becomes state from pneumatic supply 61 to the first electromagnetically operated valve 40 that supply with air pressure from.
And, input the decline of cloth pressing 11 if utilize the operation of operating pedal 92, then 90 pairs of the first electromagnetically operated valves 40 of control circuit are not exported connection signal, and therefore the first electromagnetically operated valve 40 is kept initial position.Therefore, as shown in Figure 2, air pressure is supplied with to the second air chamber 32 of the first cylinder 30, and cloth pressing 11 is lowered by movement, becomes simultaneously the state that applies falling pressure.
And, input the rising of cloth pressing 11 if utilize the operation of operating pedal 92, then 90 pairs of the first electromagnetically operated valves of control circuit, 40 output connection signals switch to the service position with the first electromagnetically operated valve 40.Therefore, air pressure is supplied with to the first air chamber 31 of the first cylinder 30, cloth pressing 11 is risen mobile, becomes simultaneously the state of keeping propradation.
In addition, if because have a power failure waiting certain reason to produce the dissengaged positions of main power source, then the power supply of the first electromagnetically operated valve 40 is cut off and switches to initial position.And main power source cuts off the dissengaged positions that testing circuit 91 detects main power source, and control circuit 90 makes security solenoid valve 50 become off-state.Thus, security solenoid valve 50 is maintained initial position, and pneumatic supply 61 is by inaccessible.Thus, as shown in Figure 4, two air chambers 31,32 of the first cylinder 30 become to the atmosphere opening state, become cloth pressing 11 neither is applied with to boost also not apply the state of lower step-down.Therefore, cloth pressing 11 utilizes deadweight and descends.
(action effect of execution mode)
Above-mentioned sewing machine 10, such as because have a power failure waiting when causing cutting off to the driving power of the first electromagnetically operated valve 40, control circuit 90 is by making first and second air chamber 31 of the first cylinder 30,32 the two all become to the atmosphere opening state, thereby cloth pressing 11 does not all bear from the first cylinder 30 in optional position up and down and keeps pressing, become the state that utilizes deadweight to descend, avoid the interference with other not shown mechanism, even in the cloth pressing 11 that descends, sandwich cloth etc. simultaneously, owing to being only utilizes deadweight to descend, therefore can easily remove the cloth that is sandwiched because pressing.
In addition, the first pneumatic circuit 60, because utilize security solenoid valve 50 and the first electromagnetically operated valve 40 that two air chambers 31,32 of the first cylinder 30 are become to the atmosphere opening state, so can security solenoid valve 50 be installed to the existing sewing machine that does not have security solenoid valve 50, by applying of such easy structure, thereby obtain above-mentioned effect, the transformation that the decline state of cloth pressing 11 keeps in the time of can realizing for the releasing dump or the reduction of production cost.
(other)
In addition, in above-mentioned sewing machine 10, at control circuit 90 main power source is set and cuts off testing circuit 91, carry out the detection of the dissengaged positions of main power source, but the structure that also can adopt the working power of security solenoid valve 50 directly to obtain from power circuit 93.Thus, if the power supply from power circuit 93 is cut off, then because security solenoid valve 50 utilizes the spring auto-returned to initial position, so can need not by the control of control circuit 90 and main power source is set to cut off testing circuit 91, obtain and above-mentioned same effect.In addition, in this case, auto-returned to the structure (in the situation that this security solenoid valve 50 is spring) of initial position is equivalent to open cell during the non-supply of the working power in security solenoid valve 50.
(schematic configuration of the second execution mode)
In Fig. 5～Fig. 8, at length describe for the sewing machine 10A as the second execution mode of the present invention.Among this sewing machine 10A, be outside the first pneumatic circuit 60A and sewing machine 10 different, replace the first electromagnetically operated valve 40 of aforementioned sewing machine 10 and the structure of security solenoid valve 50, have new the first electromagnetically operated valve 40A and control circuit 90A thereof, for other structure because identical with sewing machine 10, so for the structure identical label of mark that repeats and the repetitive description thereof will be omitted.
The first electromagnetically operated valve 40A is 35 mouthfuls of valves that can switch between initial position and first and second service position, has first～the 5th air scoop 41A～45A.
In addition, the first electromagnetically operated valve 40A, to press from the supply of pneumatic supply 61 to be used for the type pilot that switch the position, usually pressing from the supply of pneumatic supply 61 makes it move to initial position, simultaneously, this first electromagnetically operated valve 40A has: the first o 46A, and it switches, and the first electromagnetically operated valve 40A is carried out to the change action of the first service position; And the second o 47A, it switches, and the first electromagnetically operated valve 40A is carried out to the change action of the second service position.
And the first electromagnetically operated valve 40A when initial position (valve central authorities), is communicated with the first air scoop 41A as shown in Figure 6 with the 3rd air scoop 43A, the second air scoop 42A is communicated with the 5th air scoop 45A, and the 4th air scoop 44A is inaccessible.
And, as shown in Figure 7,, when the first air scoop 41A is communicated with the 4th air scoop 44A, the second air scoop 42A is communicated with the 5th air scoop 45A, with the 3rd air scoop 43A obturation when (valve left side) in the first service position.
And, as shown in Figure 8,, the first air scoop 41A is communicated with the 3rd air scoop 43A when (valve right side) in the second service position, the second air scoop 42A is communicated with the 4th air scoop 44A, the 5th air scoop 45A is inaccessible.
Further specify each air scoop 41A～45A of the first electromagnetically operated valve 40A and the connection status between the outside, shown in Fig. 6～8, for this first electromagnetically operated valve 40A, the first air chamber 31 that connects the first cylinder 30 at the first air scoop 41A, the second air chamber 32 that connects the first cylinder 30 at the second air scoop 42A, on the 3rd air scoop 43A, be not formed by connecting whatever as to the atmosphere opening state, connect pneumatic supply 61 at the 4th air scoop 44A, on the 5th air scoop 45A, be not formed by connecting whatever as to the atmosphere opening state.
Therefore, when the first electromagnetically operated valve 40A was positioned at initial position, as shown in Figure 6, pneumatic supply 61 was by the inaccessible state from air pressure to any part that all do not supply with that becomes, and two air chambers 31,32 of the first cylinder 30 are to atmosphere opening, and cloth pressing 11 is not applied up or down power.Therefore, cloth pressing 11 becomes the state that utilizes deadweight and descend.
In addition, when the first electromagnetically operated valve 40A is positioned at the first service position, supplies with air pressure and piston is retreated to the first air chamber 31 of the first cylinder 30, cloth pressing 11 is applied the locomotivity of rising.
And, when the first electromagnetically operated valve 40A is positioned at the second service position, supplies with air pressure and make piston-advance to the second air chamber 32 of the first cylinder 30, cloth pressing 11 is applied the locomotivity of decline.
While setting operation pedal 92 on control circuit 90A, when inputting the rising of cloth pressings 11 by operating pedal 92, make the first o 46A of the first electromagnetically operated valve 40A become on-state and switch to the first service position, by the decline of operating pedal 92 input cloth pressings 11 time, make the second o 47A become on-state and switch to the second service position.Thus, when the rising input of operating pedal 92, the action that cloth pressing 11 utilizes air pressure to rise, when the decline input of operating pedal 92, the action that cloth pressing 11 utilizes air pressure to descend.
And if supply with because having a power failure etc. former thereby being cut off from the power supply of power circuit 93, then control circuit 90A does not all export connection signal among o 46A, the 47A any, and the first electromagnetically operated valve 40A switches to initial position.Thus, when main power source cuts off, do not supply with air pressure to any air chamber 31,32 of the first cylinder 30, and become to the atmosphere opening state.Therefore, control circuit 90A works as open cell.
And by said structure, sewing machine 10A can obtain the effect identical with aforementioned sewing machine 10.And, because the first electromagnetically operated valve 40A also has two air chambers 31,32 of the first cylinder 30 are become to the position of atmosphere opening state, therefore can reduce be used to the components number that makes the first cylinder 30 to atmosphere opening, can realize the raising of production efficiency.
(schematic configuration of the 3rd execution mode)
In Fig. 9, at length describe for the sewing machine 10B as the 3rd execution mode of the present invention.This sewing machine 10B is except the structure identical with sewing machine 10, and difference is to have the second pneumatic circuit 160B and control circuit 90B.In addition, in following explanation, for the structure mark identical label identical with sewing machine 10 and the repetitive description thereof will be omitted.
The second pneumatic circuit 160B has: the second cylinder 130B, use in its purposes outside cloth pressing 11; And the second electromagnetically operated valve 140B, it is changeable to be following position, namely, make the first air chamber 131B of this second cylinder 130B become to the atmosphere opening state and make the second air chamber 132B become the initial position of air pressure supply condition, and make the first air chamber 131B become the air pressure supply condition and the second air chamber 132B is become to the service position of atmosphere opening state.
This second cylinder 130B and the second electromagnetically operated valve 140B use the parts identical with the first electromagnetically operated valve 40 with aforementioned the first cylinder 30, and its connection is also identical.
And the second cylinder 130B for example is preferred for sewing machine 10B in the process of making, and supplies with when being cut off because of the power supplys such as power failure of main power source, need to keep the purposes of the service position in the process of making.For example preferably by in the process of making, keeping a certain position or attitude by the second cylinder 130B, and also need to keep this position or attitude when causing power supply to be supplied with cutting off waiting by having a power failure, thereby prevent with the purposes of the interference of other mechanism etc.Particularly more preferably be used for avoiding cloth pressing 11 structure and this cloth pressing 11 on every side to interfere.
As an example, enumerated the cylinder as the line cleanup action drive source of line cleaning mechanism.In the situation that the drive source as line cleaning section uses, be equipped with the second cylinder 130B, so that in the process of making, make for line cleaning section is not hindered, the forward travel state of the piston by keeping the second cylinder 130B, thereby make line cleaning section keep retreating position, and utilize retreating of piston mobile and carry out the line cleaning and again advance and make line cleaning section return retreating position.
In addition, control circuit 90B carries out the control identical with control circuit 90 for the first pneumatic circuit 60.Therefore, main power source also is set and cuts off testing circuit 91 in control circuit 90B.
And, for the second pneumatic circuit 160B, make in the process and do not carry out the output of connection signal in order to make the second electromagnetically operated valve 140B keep initial position, therefore the second cylinder 130B keeps progressive position, and line cleaning section keeps retreating position.And the output connection signal switches to the service position with the second electromagnetically operated valve 140B during the execution of Hand scarf, the second cylinder 130B is retreated and makes the action of line cleaning section.Then, stop connection signal and make the second cylinder 130B again return forward travel state, line cleaning section is kept out of the way.
On the other hand, when power circuit 93 became the dump state because power failure waits, the second electromagnetically operated valve 140B still kept stop position.Therefore, can keep to the supply condition of the air pressure of the second air chamber 132B of the second cylinder 130B, line cleaning section can keep retreating position.
Like this, in sewing machine 10B, as previously mentioned, because cloth pressing 11 is not kept the decline pressed state during dump, even sandwich so some occurs, do not need to switch the total valve of pneumatic supply 61 and open each cylinder 30,130B yet, even therefore exist in the situation of the second pneumatic circuit 160B that shares pneumatic supply 61, can keep the air pressure supply condition of the second cylinder 130B yet.Therefore, prevent because can not keeping the air pressure supply condition, and for example when dump or during power up, line cleaning section moves from retreating position, thereby interferes with other mechanism, can be so that making behind the power up restarts to become easy.
Claims (4)
1. sewing machine, it has:
Supporting mechanism, it liftably supports for the cloth pressing that keeps cloth; And first pneumatic circuit, it has: the first cylinder, and it has makes the uplifted side air chamber that cloth pressing rises and the decline side air chamber that makes its decline; And first electromagnetically operated valve, it is changeable to be following position, namely, make aforementioned uplifted side air chamber become the air pressure supply condition and make aforementioned decline side air chamber become to the primary importance of atmosphere opening state and make aforementioned uplifted side air chamber become to the atmosphere opening state and make aforementioned decline side air chamber become the second place of air pressure supply condition
It is characterized in that,
Aforementioned the first pneumatic circuit has open cell, when it cuts off at the driving power to aforementioned the first electromagnetically operated valve, originally be not supplied among aforementioned uplifted side air chamber and the decline side air chamber in the air chamber of air pressure and supply with air pressure, and both are all become to the atmosphere opening state.
2. sewing machine according to claim 1 is characterized in that, has:
Other operating mechanism, it is the structure around the aforementioned cloth pressing, carries out the action outside the lifting of aforementioned cloth pressing; And
The second pneumatic circuit, it uses the pneumatic supply that is connected with aforementioned open cell, has:
The second cylinder, itself and aforementioned other operating mechanism link; And second electromagnetically operated valve, it is changeable to be following position, that is, make an air chamber of this second cylinder become the air pressure supply condition and make another air chamber become to the 4th position of atmosphere opening state and make an air chamber become to the atmosphere opening state and make another air chamber become the 5th position of air pressure supply condition.
3. sewing machine according to claim 1 and 2 is characterized in that,
Aforementioned open cell has security solenoid valve, and it is arranged between aforementioned the first electromagnetically operated valve and the pneumatic supply, and changeablely supply with the state of air pressure and make the first electromagnetically operated valve to the state of atmosphere opening to this first electromagnetically operated valve,
Aforementioned open cell is switched aforementioned security solenoid valve when driving power cuts off, so that aforementioned the first electromagnetically operated valve becomes to the atmosphere opening state.
4. sewing machine according to claim 1 and 2 is characterized in that,
Aforementioned the first electromagnetically operated valve is changeable for aforementioned primary importance, the aforementioned second place and make two air chambers all become the 3rd position to the atmosphere opening state,
Aforementioned open cell when driving power cuts off, switches to aforementioned the first electromagnetically operated valve and makes two air chambers all become the 3rd position to the atmosphere opening state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810173226 CN101724988B (en) | 2008-10-24 | 2008-10-24 | Sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810173226 CN101724988B (en) | 2008-10-24 | 2008-10-24 | Sewing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101724988A CN101724988A (en) | 2010-06-09 |
| CN101724988B true CN101724988B (en) | 2013-03-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810173226 Active CN101724988B (en) | 2008-10-24 | 2008-10-24 | Sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101724988B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1397673A (en) * | 2001-06-30 | 2003-02-19 | 大和缝纫机制造株式会社 | Cloth pressuring device of sewing machine |
| CN1854368A (en) * | 2005-04-27 | 2006-11-01 | 兄弟工业株式会社 | Sewing machine |
-
2008
- 2008-10-24 CN CN 200810173226 patent/CN101724988B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1397673A (en) * | 2001-06-30 | 2003-02-19 | 大和缝纫机制造株式会社 | Cloth pressuring device of sewing machine |
| CN1854368A (en) * | 2005-04-27 | 2006-11-01 | 兄弟工业株式会社 | Sewing machine |
Non-Patent Citations (2)
| Title |
|---|
| JP昭63-11192A 1988.01.18 |
| JP特开平10-244086A 1998.09.14 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101724988A (en) | 2010-06-09 |
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