JP2005137694A - Sewing machine - Google Patents

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JP2005137694A
JP2005137694A JP2003378908A JP2003378908A JP2005137694A JP 2005137694 A JP2005137694 A JP 2005137694A JP 2003378908 A JP2003378908 A JP 2003378908A JP 2003378908 A JP2003378908 A JP 2003378908A JP 2005137694 A JP2005137694 A JP 2005137694A
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cloth
feed
origin
needle
drive
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Yasushi Kakizaki
康 柿崎
Fumio Ito
文夫 伊藤
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Juki Corp
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Juki Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To improve the precision in detecting the origin of an adjusting operation driving means. <P>SOLUTION: The sewing machine comprises a feeder mechanism 30 for making a feed dog 31 appear on top of a slide plate 13 synchronizing with a needle driving mechanism for moving a sewing needle upward/downward, a cloth presser means 14 for pressing a cloth in sewing by pressing the top of the slide plate with the feed dog 31 at the appearing position, a feeding quantity adjusting mechanism 40 capable of adjusting the quantity of feeding of the cloth by one stitch by acting on the feeder mechanism, the adjusting operation driving means 43 for driving the operation of adjusting the quantity of feeding by the feeding quantity adjusting mechanism, and an operation control means 50 for controlling the quantity of driving of the adjusting operation driving means. The operation control means detects the origin of the adjusting operation driving means when the feed dog does not appear on top of the slide plate based on the phase of the cycle of appearance of the feed dog. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、送り量調節動作の駆動源を備えるミシンに関する。   The present invention relates to a sewing machine including a drive source for a feed amount adjustment operation.

従来のミシンは、縫い針を上下動させる針駆動機構と、針駆動機構に同期して送り歯を針板上面に出没させる送り機構と、送り機構に作用して一針当りの布送り量を調節可能な送り量調節機構と、送り量調節機構による送り量調節動作の駆動を行うステッピングモータと、ステッピングモータの駆動量を制御する動作制御手段とを備えている(例えば、特許文献1参照)。
上記構成の従来のミシンは、設定された布送り量に応じてステッピングモータが駆動して送り量調節機構の調節駆動を行うと共にその駆動量に応じて布送り量が設定されていた。
特開2000−51557号公報(第3図)
The conventional sewing machine has a needle drive mechanism that moves the sewing needle up and down, a feed mechanism that causes the feed dog to move up and down on the top surface of the needle plate in synchronization with the needle drive mechanism, and a cloth feed amount per stitch that acts on the feed mechanism. An adjustable feed amount adjusting mechanism, a stepping motor for driving a feed amount adjusting operation by the feed amount adjusting mechanism, and an operation control means for controlling the driving amount of the stepping motor are provided (for example, see Patent Document 1). .
In the conventional sewing machine having the above-described configuration, the stepping motor is driven according to the set cloth feed amount to perform adjustment drive of the feed amount adjusting mechanism, and the cloth feed amount is set according to the drive amount.
JP 2000-51557 A (FIG. 3)

上述の従来のミシンにおいて、ステッピングモータのように、駆動量を制御可能な駆動手段を用いて送り量の調節制御を行う場合には、その駆動量の変化量を規定するために、予め原点検出を行うことが不可欠となる。この原点検出は、ステッピングモータから送り量調節機構に駆動を働きかける部材が、予め決められた原点位置にあるか否かを検出する原点センサを設け、当該原点センサにより検出された位置を原点として、それを基準とする駆動変化量に応じて送り量を設定する。   In the above-mentioned conventional sewing machine, when the feed amount is adjusted and controlled using a drive means that can control the drive amount, such as a stepping motor, the origin is detected in advance in order to define the change amount of the drive amount. It is essential to do. This origin detection is provided with an origin sensor that detects whether or not the member that drives the feed amount adjustment mechanism from the stepping motor is at a predetermined origin position, and the position detected by the origin sensor is used as the origin, The feed amount is set according to the drive change amount based on it.

ところで、上記従来のミシンにあっては、針板の下に送り歯が内蔵され、当該送り歯の出没時に送り歯が布送り方向に移動することで布送りが行われる。そして、その際には、送り歯による布地の搬送力が十分に付与されるように、上方から針板上面に布地を押圧する布押さえ手段が設けられているのが一般的である。
しかしながら、送り歯が布押さえ手段により押圧されている状態でステッピングモータが駆動されると、送り歯を介して布押さえ手段に押圧力による負荷がステッピングモータにかかり、ステッピングモータが脱調して高精度の原点位置が検出できないという不都合があった。すなわち、一般にステッピングモータは停止時のトルクは、回転時のトルクより大きいため送り量が一定に保たれる通常の縫製中は、布押さえ手段の押圧力に対して十分なトルクで回転位置を保持することができ脱調は発生しないが、原点検出や送り量調節などを行うステッピングモータ駆動時には、トルクが不足し布押さえ手段の押圧力による負荷により制御手段の指令する正確なパルス数送りができず脱調が発生する場合があった。これは、よりトルクの大きいステッピングモータを使用することにより解消可能であるが、その場合にはステッピングモータの大型化、高コスト化を招くため、設計上、好ましくないという問題があった。
By the way, in the said conventional sewing machine, a feed dog is incorporated under a needle plate, and cloth feed is performed because a feed dog moves to a cloth feed direction at the time of the said feed dog's appearance. In that case, a cloth pressing means for pressing the cloth from the upper side to the upper surface of the needle plate is generally provided so that the cloth conveying force by the feed dog is sufficiently applied.
However, if the stepping motor is driven in a state where the feed dog is pressed by the cloth holding means, a load due to the pressing force is applied to the cloth holding means via the feed dog, and the stepping motor is stepped out and increased. There was an inconvenience that the origin position of accuracy could not be detected. That is, in general, stepping motors have a torque that is sufficient when the sewing is stopped because the torque during stoppage is greater than the torque during rotation. However, when driving a stepping motor that detects the origin or adjusts the feed amount, the torque is insufficient and the accurate number of pulses commanded by the control means can be fed by the load caused by the pressing force of the cloth pressing means. In some cases, step-out occurred. This can be solved by using a stepping motor having a larger torque. However, in this case, the stepping motor is increased in size and cost, which is undesirable in design.

本発明は、装置の大型化、高コスト化を必要とせず、送り量調節機構の送り量調節動作を行う調節動作駆動手段の原点位置検出の精度の向上を図ることを、その目的とする。
また、前記原点検出精度の向上のため、送り歯や送り量調節機構等を介して原点検出時に調節動作駆動手段にかかる布押さえ手段の押圧力による負荷や悪影響を取り除くことを目的とする。
An object of the present invention is to improve the accuracy of origin position detection of an adjustment operation driving means for performing a feed amount adjustment operation of a feed amount adjustment mechanism without requiring an increase in the size and cost of the apparatus.
Another object of the present invention is to eliminate the load and adverse effects caused by the pressing force of the cloth pressing means applied to the adjusting operation driving means when detecting the origin via a feed dog, a feed amount adjusting mechanism, or the like in order to improve the accuracy of detecting the origin.

請求項1記載の発明は、縫い針を上下動させる針駆動機構と、針駆動機構に同期して送り歯を針板上面に出没させる送り機構と、送り歯の出没位置にて針板上面を押圧して、縫製時の布押さえを行う布押さえ手段と、送り機構に作用して一針当りの布送り量を調節可能な送り量調節機構と、送り量調節機構による送り量調節動作の駆動を行う調節動作駆動手段と、調節動作駆動手段の動作原点を検出する原点位置検出手段と、調節動作駆動手段の駆動量を制御する動作制御手段と、を備え、動作制御手段が、送り歯の出没周期の位相に基づいて、針板の上面に前記送り歯が出現しないときに、原点位置検出手段により調節動作駆動手段の原点検出を行う、という構成を採っている。   According to the first aspect of the present invention, a needle drive mechanism that moves the sewing needle up and down, a feed mechanism that causes the feed dog to move up and down in synchronization with the needle drive mechanism, and a needle plate upper surface at the position where the feed dog protrudes and retracts. Cloth pressing means that presses and presses the cloth at the time of sewing, feed amount adjustment mechanism that can adjust the cloth feed amount per stitch by acting on the feed mechanism, and drive of feed amount adjustment operation by the feed amount adjustment mechanism Adjusting operation driving means, origin position detecting means for detecting the operation origin of the adjusting operation driving means, and operation control means for controlling the driving amount of the adjusting operation driving means. Based on the phase of the appearance period, when the feed dog does not appear on the upper surface of the needle plate, the origin position detecting means performs origin detection of the adjustment operation driving means.

上記構成では、縫製時において、針の上下動周期と同じ周期で送り歯が針板上面に出没を行い、針板上面に出現時に送り歯が所定の送り方向に移動することで、針板上の布地の布送りが行われる。かかる送り歯の送り量は、調節動作駆動手段が送り量調節機構を駆動させ、当該駆動量に応じて設定される。   In the above configuration, during sewing, the feed dog moves in and out on the upper surface of the needle plate at the same cycle as the needle's vertical movement, and when it appears on the upper surface of the needle plate, the feed dog moves in a predetermined feed direction, The cloth is fed. The feed amount of the feed dog is set according to the drive amount by the adjustment operation driving means driving the feed amount adjusting mechanism.

動作制御手段は、調節動作駆動手段の原点位置からの駆動量に基づいて布送りの送り量を認識するため、予め調節動作駆動手段の原点を検出する必要がある。
一方、送り歯は、針板上面に出現時は、布押さえ手段により押圧されるが、送り歯の先端部が針板上面よりも低位置にあるときには、布押さえ手段と非接触であることから、当該布押さえ手段の影響は受けない。そして、送り歯は、送り機構によって針駆動機構に同期して針板上面に出没されていることから、いつも、当該出没周期の一定の位相区間において送り歯の先端部が針板上面よりも低位置となり、当該位相の変化は、送り機構や針駆動機構の駆動源から認識することが可能である。
従って、動作制御手段は、送り歯の先端部が針板上面よりも低位置となる出没周期の一定の位相区間において、原点位置検出手段により原点検出を行うことで、布押さえ手段の影響を受けることがない。
Since the operation control means recognizes the feed amount of the cloth feed based on the drive amount from the origin position of the adjustment operation drive means, it is necessary to detect the origin of the adjustment operation drive means in advance.
On the other hand, when the feed dog appears on the upper surface of the needle plate, it is pressed by the cloth pressing means, but when the tip of the feed dog is at a lower position than the upper surface of the needle plate, it is not in contact with the cloth pressing means. The cloth pressing means is not affected. Since the feed dog is projected and retracted on the upper surface of the needle plate in synchronization with the needle drive mechanism by the feed mechanism, the tip of the feed dog is always lower than the upper surface of the needle plate in a certain phase section of the projecting and retracting period. It becomes a position, and the change of the phase can be recognized from the driving source of the feeding mechanism or the needle driving mechanism.
Therefore, the operation control means is affected by the cloth pressing means by performing the origin detection by the origin position detection means in a fixed phase section of the protrusion and withdrawal period where the tip of the feed dog is lower than the upper surface of the needle plate. There is nothing.

請求項2記載の発明は、請求項1記載の発明と同様の構成を備えると共に、動作制御手段は、原点検出から、当該原点検出により検出された原点に基づいて調節動作駆動手段による送り量の設定動作が完了するまでの期間について、送り機構の駆動速度を所定速度以下に規制する、という構成を採っている。
上記「送り機構の駆動速度を所定速度以下に規制する」とは、周期的に行われる送り動作の当該周期を所定周期以下に規制することを示すものとする。
The invention described in claim 2 has the same configuration as that of the invention described in claim 1, and the operation control means detects the feed amount by the adjustment operation drive means from the origin detection based on the origin detected by the origin detection. For the period until the setting operation is completed, a configuration is adopted in which the drive speed of the feed mechanism is restricted to a predetermined speed or less.
The above-mentioned “restricting the drive speed of the feed mechanism to a predetermined speed or less” indicates that the period of the periodically performed feed operation is restricted to a predetermined period or less.

かかる構成では、送り速度規制を行った状態で、原点検出及び送り量の設定を完了させることで、原点検出が精度良く行われるまでの送り回数を低減し、送り量精度の低い縫い目の形成を低減する。
特に、縫製開始から第一針目までに原点検出とその送り量設定動作を完了可能な駆動速度以下に規制することで、第一針目から送り量精度の高い縫い目が形成される。
In such a configuration, the origin detection and the setting of the feed amount are completed in a state where the feed speed is regulated, thereby reducing the number of feeds until the origin detection is performed accurately and forming a stitch with low feed amount accuracy. To reduce.
In particular, the stitches with high feed amount accuracy are formed from the first stitch by restricting to the driving speed at which the origin detection and the feed amount setting operation can be completed from the start of sewing to the first stitch.

請求項3記載の発明は、請求項1又は2記載の発明と同様の構成を備えると共に、動作制御手段は、主電源の入力時に、調節動作駆動手段の予備原点検出を行う、という構成を採っている。
上述の「予備原点検出」とは、その原点検出を主電源入力時に行うという点を除けば、針板の上面に送り歯が出現しないときに行う原点検出と同じ方法で行われる。つまり、針板の上面に送り歯が出現しないときに行う原点検出と区別するため、「予備原点検出」と称している。
The invention described in claim 3 has the same configuration as that of the invention described in claim 1 or 2, and the operation control means detects the preliminary origin of the adjustment operation drive means when the main power is input. ing.
The “preliminary origin detection” described above is performed in the same manner as the origin detection performed when the feed dog does not appear on the upper surface of the needle plate except that the origin detection is performed when the main power is input. That is, in order to distinguish from the origin detection performed when the feed dog does not appear on the upper surface of the needle plate, this is referred to as “preliminary origin detection”.

主電源が入力されると、動作制御手段は、送り歯が針板の上面から出現しない期間であるか否かを判断することなく、原点検出を行う。仮に、当該予備原点検出が布押さえ手段が送り歯を押圧している状態であって、検出精度の低下を生じたとしても、原点検出のための調節動作駆動手段の原点位置合わせがおおよそ行われた状態となるので、針板の上面に送り歯が出現しないときに行われる精密な原点検出の際に、原点検出のための調節動作駆動手段の原点位置合わせを迅速に行うことができ、高精度の原点検出が迅速に行われる。   When the main power is input, the operation control means detects the origin without determining whether or not the feed dog is in a period in which it does not appear from the upper surface of the needle plate. Even if the preliminary origin detection is in a state where the cloth presser is pressing the feed dog and the detection accuracy is lowered, the origin of the adjustment operation drive means for origin detection is roughly aligned. Therefore, when precise origin detection is performed when the feed dog does not appear on the upper surface of the needle plate, the origin position of the adjustment operation drive means for origin detection can be quickly adjusted. Accurate origin detection is performed quickly.

請求項4記載の発明は、縫い針を上下動させる針駆動機構と、針駆動機構に同期して送り歯を針板上面に出没させる送り機構と、送り歯の出没位置にて針板上面を押圧する布保持状態とその解除状態を切り替え可能に設けられた布押さえ手段と、少なくとも布押さえ手段の布保持状態又は解除状態を検出する布押さえ検出手段と、送り機構に作用して一針当りの布送り量を調節可能な送り量調節機構と、送り量調節機構による送り量調節動作の駆動を行う調節動作駆動手段と、調節動作駆動手段の動作原点を検出する原点位置検出手段と、調節動作駆動手段の駆動量を制御する動作制御手段と、布押さえ手段の布保持状態の解除指示を報知する報知手段と、を備え、動作制御手段は、調節動作駆動手段の原点検出時に、布押さえ検出手段により布保持状態が検出された時には報知手段により布保持状態の解除指示を報知し、布押さえ検出手段により解除状態が検出された時には原点位置検出手段による原点検出を行う布押さえ検出手段、という構成を採っている。
なお、上記布押さえ検出手段は、布押さえ手段の布保持状態と解除状態とをそれぞれ検出可能であっても良いし、どちらか一方のみを検出可能としても良い。どちらか一方のみを検出可能であれば、一方の状態が検出されない場合には他方の状態であることを動作制御手段は認識することができるからである。
The invention described in claim 4 includes a needle drive mechanism that moves the sewing needle up and down, a feed mechanism that causes the feed dog to move up and down in synchronization with the needle drive mechanism, and a needle plate upper surface at the position where the feed dog moves in and out. The cloth presser means provided so as to be able to switch between the cloth holding state to be pressed and the release state thereof, at least the cloth presser detecting means for detecting the cloth holding state or the release state of the cloth presser means, and the feed mechanism acting on one stitch A feed amount adjusting mechanism capable of adjusting the cloth feed amount, an adjusting operation driving means for driving a feed amount adjusting operation by the feed amount adjusting mechanism, an origin position detecting means for detecting an operation origin of the adjusting operation driving means, and adjustment An operation control unit for controlling the drive amount of the operation driving unit, and a notification unit for informing an instruction to release the cloth holding state of the cloth pressing unit. The operation control unit detects the origin of the adjustment operation driving unit when detecting the origin. By detection means When the cloth holding state is detected, the cloth holding state is instructed by the notifying means, and when the cloth holding state is detected by the cloth holding detecting means, the cloth press detecting means performs origin detection by the origin position detecting means. Adopted.
The cloth presser detection means may be capable of detecting the cloth holding state and the release state of the cloth presser means, or may be capable of detecting only one of them. This is because if only one of them can be detected, the operation control means can recognize that the other state is detected when one state is not detected.

上記構成では、縫製時において、針の上下動周期と同じ周期で送り歯が針板上面に出没を行い、針板上面に出現時に送り歯が所定の送り方向に移動することで、針板上の布地の布送りが行われる。かかる送り歯の送り量は、調節動作駆動手段が送り量調節機構を駆動させ、当該駆動量に応じて設定される。
上記調節動作駆動手段の原点検出に際して、布保持状態が検出されると、動作制御手段は、布押さえ手段の布押さえの解除を報知手段により報知させ、その後、ミシンの使用者により布押さえ手段の解除が行われたことが布押さえ検出手段により検出されてから原点検出を行う。
これにより、布押さえ手段による送り歯の押圧状態下での原点検出が回避される。
In the above configuration, during sewing, the feed dog moves in and out on the upper surface of the needle plate at the same cycle as the needle's vertical movement, and when it appears on the upper surface of the needle plate, the feed dog moves in a predetermined feed direction, The cloth is fed. The feed amount of the feed dog is set according to the drive amount by the adjustment operation driving means driving the feed amount adjusting mechanism.
When the cloth holding state is detected when detecting the origin of the adjustment operation driving means, the operation control means informs the release of the cloth presser of the cloth presser means by the notification means, and then the user of the sewing machine The origin detection is performed after the cloth press detection means detects that the release has been performed.
Thereby, the origin detection under the pressing state of the feed dog by the cloth pressing means is avoided.

請求項5記載の発明は、縫い針を上下動させる針駆動機構と、針駆動機構に同期して送り歯を針板上面に出没させる送り機構と、送り歯の出没位置にて針板上面を押圧する布保持状態とその解除状態を切り替え可能に設けられた布押さえ手段と、少なくとも布押さえ手段の布保持状態又は解除状態を検出する布押さえ検出手段と、送り機構に作用して一針当りの布送り量を調節可能な送り量調節機構と、送り量調節機構による送り量調節動作の駆動を行う調節動作駆動手段と、調節動作駆動手段の動作原点を検出する原点位置検出手段と、調節動作駆動手段の駆動量を制御する動作制御手段とを備え、布押さえ手段は、布保持状態と解除状態の切り替え駆動動作を付与する切り替え駆動手段を備えると共に、動作制御手段は、調節動作駆動手段の原点検出時に布押さえ検出手段により布保持状態を検出した場合に、切り替え駆動手段により布押さえ手段の布保持状態を解除させて調節動作駆動手段の原点検出を行う、という構成を採っている。
なお、布押さえ検出手段については、請求項4記載の発明と同様である。
According to a fifth aspect of the present invention, there is provided a needle drive mechanism that moves the sewing needle up and down, a feed mechanism that causes the feed dog to move in and out of the top surface of the needle plate in synchronization with the needle drive mechanism, The cloth presser means provided so as to be able to switch between the cloth holding state to be pressed and the release state thereof, at least the cloth presser detecting means for detecting the cloth holding state or the release state of the cloth presser means, and the feed mechanism acting on one stitch A feed amount adjusting mechanism capable of adjusting the cloth feed amount, an adjusting operation driving means for driving a feed amount adjusting operation by the feed amount adjusting mechanism, an origin position detecting means for detecting an operation origin of the adjusting operation driving means, and adjustment An operation control means for controlling the drive amount of the operation drive means, the cloth presser means is provided with a switching drive means for applying a switching drive operation between the cloth holding state and the release state, and the operation control means is an adjustment operation drive hand. When detecting the cloth holding state, by releasing the cloth holding state of the presser foot means performs origin detection adjustment operation driving means, and employs a configuration that the switching drive means by the presser foot detecting means when the origin detection.
The cloth presser detection means is the same as that of the fourth aspect of the invention.

上記構成では、縫製時において、針の上下動周期と同じ周期で送り歯が針板上面に出没を行い、針板上面に出現時に送り歯が所定の送り方向に移動することで、針板上の布地の布送りが行われる。かかる送り歯の送り量は、調節動作駆動手段が送り量調節機構を駆動させ、当該駆動量に応じて設定される。
上記調節動作駆動手段の原点検出に際して、動作制御手段は、布押さえ手段が布保持状態にあるかその解除状態にあるかを布押さえ検出手段により検出し、解除状態の時には原点検出を行い、布保持状態の時には切り替え駆動手段により布押さえ手段を解除状態に切り替えてから原点検出を行う。
これにより、布押さえ手段による送り歯の押圧状態下での原点検出が回避される。
In the above configuration, during sewing, the feed dog moves in and out on the upper surface of the needle plate at the same cycle as the needle's vertical movement, and when it appears on the upper surface of the needle plate, the feed dog moves in a predetermined feed direction, The cloth is fed. The feed amount of the feed dog is set according to the drive amount by the adjustment operation driving means driving the feed amount adjusting mechanism.
When detecting the origin of the adjustment operation driving means, the operation control means detects whether the cloth holding means is in the cloth holding state or its released state by the cloth holding detection means. In the holding state, the origin detection is performed after the cloth pressing means is switched to the released state by the switching driving means.
Thereby, the origin detection under the pressing state of the feed dog by the cloth pressing means is avoided.

請求項1記載の発明は、送り歯の出没周期において、送り歯の先端部が針板上面よりも低位置となる一定の位相区間を認識し、当該区間において、調節動作駆動手段の原点検出を行うことから、布押さえ手段が送り歯と非接触状態において原点検出が行われることとなり、布押さえ手段による原点位置誤差の発生を回避し、精度良く原点検出を行うことが可能となる。また、トルクの大きなステッピングモータを不要とすることができ、装置の大型又はコスト上昇を回避することが可能となる。   The invention according to claim 1 recognizes a constant phase section where the tip of the feed dog is lower than the upper surface of the needle plate during the feed dog's protrusion and withdrawal period, and detects the origin of the adjustment operation driving means in the section. As a result, the origin detection is performed when the cloth presser is not in contact with the feed dog, so that the origin position error caused by the cloth presser is avoided and the origin can be detected with high accuracy. Further, a stepping motor having a large torque can be dispensed with, and an increase in the size or cost of the apparatus can be avoided.

請求項2記載の発明は、送り速度規制を行った状態で原点検出及び送り量の設定を完了させるので、原点検出が精度良く行われるまでの送り回数を低減し、送り量精度の低い縫い目の形成を低減することが可能となる。つまり、縫い品質の向上を図る事が可能となる。
また、縫製開始から第一針目までに原点検出とその送り量設定動作を完了可能な駆動速度まで規制することで、第一針目から送り量精度の高い縫い目を形成することが可能となり、さらなる縫い品質の向上を図ることができる。
According to the second aspect of the present invention, since the origin detection and the setting of the feed amount are completed in a state where the feed speed is regulated, the number of feeds until the origin detection is accurately performed is reduced, and the seam having a low feed amount accuracy is obtained. Formation can be reduced. That is, it is possible to improve the sewing quality.
Also, by restricting the drive speed that can complete the origin detection and feed amount setting operation from the start of sewing to the first stitch, it becomes possible to form stitches with high feed amount accuracy from the first stitch, and further sewing The quality can be improved.

請求項3記載の発明は、主電源入力時に、送り歯が針板の上面から出現しない期間であるか否かを判断することなく、原点検出が行われ、原点検出のための調節動作駆動手段の原点位置合わせがおおよそ行われた状態となるので、針板の上面に送り歯が出現しないときに行われる精密な原点検出の際に、原点検出のための調節動作駆動手段の原点位置合わせを迅速に行うことが可能となり、高精度の原点検出の迅速化によりに、縫製開始時早期段階から送り量精度の高い縫い目を形成することが可能となり、さらなる縫い品質の向上を図ることが可能となる。   According to the third aspect of the present invention, the origin detection is performed without determining whether or not the feed dog does not appear from the upper surface of the needle plate when the main power is input, and the adjustment operation driving means for the origin detection is performed. The origin position of the adjustment operation drive means for origin detection is adjusted during precise origin detection performed when the feed dog does not appear on the upper surface of the needle plate. It is possible to perform quickly, and high-precision origin detection speeds up, so that it is possible to form a seam with high feed amount accuracy from the early stage of sewing, which can further improve the sewing quality. Become.

請求項4記載の発明は、布押さえ手段の布押さえの解除の報知を行い、布押さえ手段の解除が行われたことが布押さえ検出手段により検出されてから原点検出を行うので、布押さえ手段が送り歯と非接触状態において原点検出が行われることとなり、布押さえ手段による原点位置誤差の発生を回避し、精度良く原点検出を行うことが可能となる。また、トルクの大きなステッピングモータを不要とすることができ、装置の大型又はコスト上昇を回避することが可能となる。   In the invention according to claim 4, since the cloth presser is informed of the release of the cloth presser and the origin is detected after the release of the cloth presser is detected by the cloth presser detector, the cloth presser However, the origin detection is performed in a non-contact state with the feed dog, and it is possible to avoid the origin position error caused by the cloth pressing means and to perform the origin detection with high accuracy. Further, a stepping motor having a large torque can be dispensed with, and it is possible to avoid an increase in the size or cost of the apparatus.

請求項5記載の発明は、布押さえ手段の布押さえ状態の検出を行い、押さえ状態なら切り替え駆動手段により解除に切り替えてから原点検出を行うので、布押さえ手段が送り歯と非接触状態において原点検出が行われることとなり、布押さえ手段による原点位置誤差の発生を回避し、精度良く原点検出を行うことが可能となる。また、トルクの大きなステッピングモータを不要とすることができ、装置の大型又はコスト上昇を回避することが可能となる。   The invention according to claim 5 detects the cloth pressing state of the cloth pressing means, and if it is in the pressing state, the origin is detected after switching to the release by the switching drive means. The detection is performed, and the origin position error due to the cloth pressing means can be avoided and the origin can be detected with high accuracy. Further, a stepping motor having a large torque can be dispensed with, and it is possible to avoid an increase in the size or cost of the apparatus.

(ミシンの全体構成)
以下、図面に基づいて本発明の実施の形態を詳細に説明する。
本実施の形態に係るミシン1は、図1に示すように、ミシン脚卓T上に載置され、上面に針板が設けられたベッド部2a(破線)と、ベッド部2aの上方においてベッド部2aと略平行に延在するアーム部2bと、ベッド部2aの一端部側に立設されてアーム部2bの一端部を支持する胴部と、アーム部2bの一端部から下方に延出して上下動自在な針棒11と、図示していない上軸を回転駆動する駆動手段としてのミシンモータ12と、上軸の回転駆動に連動して針棒11及び縫い針を上下動させる図示しない針駆動機構と、縫い針の上下動に同期して布地の送り方向(X軸方向)に直交する方向(Y軸方向)に針振り行う図示を省略した針振り機構と、ベッド部2a上に載置された布地を送る送り機構30と、送り歯31の出没位置にて針板13(図2参照)の上面を押圧して、縫製時の布押さえを行う布押さえ手段14と、送り機構30に作用して一針当りの布送り量を調節可能な送り量調節機構40と、ミシン1全体の動作を統合制御する動作制御手段としての制御装置50と、送り機構30を操作して送り量を変更する手動操作可能な返し縫い用(止め縫い用)の操作レバー15と、踏込み量によってミシンモータ12の回転速度を調節する操作ペダル16と、送り機構30の送り量の上限値や下限値等の設定を行うための各種スイッチを有する操作パネル54とを備えている。このミシン1は、針棒11の先端に装着された縫い針をミシンモータ12で上下動させながら送り機構30により布地を所定の方向に送ることで、布地に縫い目を施すものである。
なお、ベッド部2aの上部にはその上面が水平面に沿った針板13が配設され、当該針板13の上面に平行であって上記ミシン1のアーム部2b及びベッド部2aの長手方向に沿った方向をY軸方向とし、針板13の上面に平行であってY軸方向と直交する方向をX軸方向とし、垂直上下方向をZ軸方向として以下の説明を行うものとする。
(Whole structure of the sewing machine)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a sewing machine 1 according to the present embodiment is placed on a sewing machine table T, a bed portion 2a (dashed line) having a needle plate on the upper surface, and a bed above the bed portion 2a. An arm portion 2b extending substantially parallel to the portion 2a, a body portion standing on one end portion side of the bed portion 2a and supporting one end portion of the arm portion 2b, and extending downward from one end portion of the arm portion 2b A needle bar 11 that can be moved up and down, a sewing machine motor 12 as a driving means for rotationally driving an upper shaft (not shown), and a needle bar 11 and a sewing needle that move up and down in conjunction with the rotational drive of the upper shaft (not shown). A needle drive mechanism, a needle swing mechanism (not shown) that swings in a direction (Y-axis direction) orthogonal to the cloth feed direction (X-axis direction) in synchronization with the vertical movement of the sewing needle, and a bed portion 2a In the feed mechanism 30 that feeds the placed fabric and the position where the feed dog 31 appears and disappears A cloth presser 14 that presses the upper surface of the plate 13 (see FIG. 2) and presses the cloth at the time of sewing, and a feed amount adjustment mechanism 40 that acts on the feed mechanism 30 to adjust the cloth feed amount per stitch. A control device 50 as operation control means for integrated control of the entire operation of the sewing machine 1, a manually operable reverse stitching (for back stitching) operation lever 15 for operating the feed mechanism 30 to change the feed amount, An operation pedal 16 that adjusts the rotational speed of the sewing machine motor 12 according to the depression amount, and an operation panel 54 having various switches for setting an upper limit value, a lower limit value, and the like of the feed amount of the feed mechanism 30 are provided. In the sewing machine 1, a sewing needle attached to the tip of a needle bar 11 is moved up and down by a sewing machine motor 12 to feed the fabric in a predetermined direction by a feeding mechanism 30, thereby giving a stitch to the fabric.
In addition, a needle plate 13 having an upper surface along a horizontal plane is disposed on the upper portion of the bed portion 2a, and is parallel to the upper surface of the needle plate 13 and in the longitudinal direction of the arm portion 2b and the bed portion 2a of the sewing machine 1. The following description will be made with the direction along the Y axis direction, the direction parallel to the upper surface of the needle plate 13 and perpendicular to the Y axis direction as the X axis direction, and the vertical vertical direction as the Z axis direction.

(送り機構)
まず、図2及び図3を用いて、送り機構30の機械的構成について説明する。図2は図1のII−II部分の断面におけるベッド部2aの下方から見た断面図であり、図3は、図2のIII−III部分の断面図である。
ベッド部2a内には、図2に示すように、Y軸方向に沿った状態で下軸17が回転自在に支持されている。この下軸10は、図示されていないリンク機構やベルト機構のような伝達機構を介してミシンモータ12に連結されており、針棒11に上下動駆動力を付与する図示しない上軸と連動して回転駆動を行う。そして、送り機構30は、下軸17から布送りのための駆動力が付与される。
(Feeding mechanism)
First, the mechanical configuration of the feed mechanism 30 will be described with reference to FIGS. 2 and 3. 2 is a cross-sectional view of the cross section taken along the line II-II in FIG. 1 as viewed from below the bed 2a, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG.
As shown in FIG. 2, a lower shaft 17 is rotatably supported in the bed portion 2a in a state along the Y-axis direction. The lower shaft 10 is connected to a sewing machine motor 12 via a transmission mechanism such as a link mechanism or a belt mechanism (not shown), and interlocks with an upper shaft (not shown) that applies a vertical driving force to the needle bar 11. To rotate. The feeding mechanism 30 is given a driving force for feeding the cloth from the lower shaft 17.

送り機構30は、針板13の上面上の布地をX軸方向に沿って搬送する送り歯31と、下軸17の一端部(図2下方)に固定された偏心カム32aを介して下軸17と送り歯31とを連結する上下動リンク体32と、偏心カム33aを介して下軸17にその一端部が連結された左右動リンク体33と、左右動リンク体33の他端部がその中間部に連結された送り量調節リンク体34と、送り量調節リンク体34の一端部と送り歯31とを連結する伝達支軸35とを備えている。   The feed mechanism 30 includes a feed dog 31 that transports the cloth on the upper surface of the needle plate 13 along the X-axis direction, and a lower shaft via an eccentric cam 32a that is fixed to one end of the lower shaft 17 (downward in FIG. 2). 17 is connected to the lower shaft 17 via an eccentric cam 33a, and the other end of the left and right link 33 is connected to the lower shaft 17 via an eccentric cam 33a. A feed amount adjusting link body 34 connected to the intermediate portion and a transmission support shaft 35 for connecting one end of the feed amount adjusting link body 34 and the feed dog 31 are provided.

上記上下動リンク体32は、その一端部が送り歯31に対して回転可能に連結され、他端部が偏心カム32aによりその偏心量に応じた円周運動を行う。この上下動リンク体32の円周運動の内、上下方向の往復駆動力のみが送り歯31に伝達される。つまり、送り歯31は下軸17の回転駆動時には常に偏心カム32aの偏心量に等しい変位で上下動を行うこととなる。   One end of the vertically moving link body 32 is rotatably connected to the feed dog 31, and the other end performs a circumferential motion according to the amount of eccentricity by an eccentric cam 32a. Of the circumferential motion of the vertically moving link body 32, only the reciprocating driving force in the vertical direction is transmitted to the feed dog 31. That is, the feed dog 31 always moves up and down with a displacement equal to the eccentric amount of the eccentric cam 32a when the lower shaft 17 is driven to rotate.

左右動リンク体33は、その一端部が送り量調節リンク体34に対して回転可能に連結され、他端部が偏心カム33aによりその偏心量に応じた円周運動を行う。この左右動リンク体33の円周運動の内、上下方向の往復駆動力のみが送り量調節リンク体34に伝達される。   One end of the left / right link body 33 is rotatably connected to the feed amount adjusting link body 34, and the other end thereof performs a circumferential motion according to the amount of eccentricity by the eccentric cam 33a. Of the circumferential movement of the left and right link body 33, only the reciprocating driving force in the vertical direction is transmitted to the feed amount adjusting link body 34.

送り量調節リンク体34は、その長手方向中間部において左右動リンク体33から上下方向の往復駆動力を付与され、その一端部が伝達支軸35の一端部に設けられた後述するアーム部35bの先端部を揺動可能に連結されている。従って、送り量調節リンク体34は、その一端部を揺動支点として他端部が上下方向に揺動運動を行うこととなる。そして、送り量調節リンク体34の他端部には、後述する送り量調節機構40の角駒41が連結されている。   The feed amount adjusting link body 34 is given a reciprocating driving force in the vertical direction from the left and right moving link body 33 at the longitudinal intermediate portion, and one end portion of the feed amount adjusting link body 34 provided at one end portion of the transmission support shaft 35 is described later. The tip of each of the two is pivotably connected. Accordingly, the feed amount adjusting link body 34 swings in the vertical direction at the other end portion with the one end portion serving as a swing fulcrum. A square piece 41 of a feed amount adjusting mechanism 40 described later is connected to the other end portion of the feed amount adjusting link body 34.

かかる角駒41は、その往復移動方向が、Z軸方向と平行な状態を基準としてX軸方向両側に傾斜させて調節可能な状態で支持されている。そして、角駒41がZ軸方向と平行に往動可能に支持されている状態にあっては、送り量調節リンク体34にX軸方向の変位は生じない。一方、角駒41の往復移動方向がX軸方向に傾斜を生じた場合には、送り量調節リンク体34は、X軸方向に変位を生じることとなる。また、Z軸方向に平行な状態からX軸方向の一方と他方のいずれに傾斜したかによって、送り量調節リンク体34のX軸方向における揺動動作はその位相が逆転することとなる。   The square piece 41 is supported in such a manner that the reciprocating direction of the square piece 41 can be adjusted by inclining on both sides in the X-axis direction with reference to a state parallel to the Z-axis direction. When the square piece 41 is supported so as to be able to move in parallel with the Z-axis direction, the feed amount adjustment link body 34 is not displaced in the X-axis direction. On the other hand, when the reciprocating direction of the square piece 41 is inclined in the X-axis direction, the feed amount adjusting link body 34 is displaced in the X-axis direction. Further, the phase of the swing operation in the X-axis direction of the feed amount adjusting link body 34 is reversed depending on whether the tilt is made to one or the other in the X-axis direction from the state parallel to the Z-axis direction.

伝達支軸35は、Y軸方向に沿って配設された軸部35aと、軸部35aの一端部と他端部とにそれぞれ設けられたアーム部35b,35cとを備えている。そして、軸部35aが中心軸となって双方のアーム部35b,35cの先端部がいずれも連動して揺動を行うようになっている。
一方のアーム部35bの先端部が送り量調節リンク体34の一端部と連結され、他方のアーム部35cの先端部が送り歯31に連結されている。従って、前述したように、角駒41の往復移動方向の調節に応じて、送り量調節リンク体34にX軸方向に沿った揺動運動が生じる場合には、送り歯31に逆位相でX軸方向の揺動駆動力を付与することとなる。そして、送り量調節リンク体34と伝達支軸35を介して、角駒41の往復移動方向に応じた位相でX軸方向に沿った往復移動動作を行うこととなる。
The transmission support shaft 35 includes a shaft portion 35a disposed along the Y-axis direction, and arm portions 35b and 35c provided at one end and the other end of the shaft portion 35a, respectively. Then, the shaft portion 35a serves as a central axis, and the tip portions of both the arm portions 35b and 35c are swung in conjunction with each other.
The distal end portion of one arm portion 35 b is connected to one end portion of the feed amount adjusting link body 34, and the distal end portion of the other arm portion 35 c is connected to the feed dog 31. Therefore, as described above, when the feed amount adjusting link body 34 swings along the X-axis direction in accordance with the adjustment of the reciprocating direction of the square piece 41, the feed dog 31 has an X in reverse phase. An axial driving force is applied. Then, the reciprocating movement operation along the X-axis direction is performed through the feed amount adjusting link body 34 and the transmission support shaft 35 with a phase corresponding to the reciprocating direction of the square piece 41.

送り機構30は、上記構成により下軸17の回転駆動力を利用して送り歯31にX軸方向とZ軸方向の往復運動を組み合わせて付与することで長円運動を行わせる。このとき、送り歯31は、針板13の下方に配設されると共に、長円運動により描かれる軌跡の一部を移動する際に当該送り歯31の先端部が針板13に設けられた貫通口からその上面に突出し、その際のX軸方向運動の位相に応じて布地を正方向(図3における左方向)、逆方向(図3における右方向)に送ることができる。また、角駒41の往復移動方向に応じて、その送り量も調節可能であると共に送り量を0とすることも可能である。   With the above configuration, the feed mechanism 30 uses the rotational driving force of the lower shaft 17 to provide the feed dog 31 with a combination of reciprocating motions in the X-axis direction and the Z-axis direction to perform an elliptical motion. At this time, the feed dog 31 is disposed below the needle plate 13, and the tip of the feed dog 31 is provided on the needle plate 13 when moving a part of the locus drawn by the elliptical motion. The fabric protrudes from the through hole to the upper surface, and the fabric can be fed in the forward direction (left direction in FIG. 3) and in the reverse direction (right direction in FIG. 3) according to the phase of the movement in the X-axis direction. Further, according to the reciprocating direction of the square piece 41, the feed amount can be adjusted and the feed amount can be set to zero.

そして、送り歯31の長円運動の回転数は下軸17の回転数と一致しており、下軸17は上軸と回転数が一致することから、送り歯31が針板13の上面に出現する周期は針棒11の上下動周期及び上軸の回転周期と一致する。また、上軸の位相(ある角度を0°とした場合において、0°からの回転角度)において常に同じ区間において送り歯31は針板13の上面に出現し、それ以外の区間では送り歯31の先端部は針板13の上面より下方に位置することとなる。本実施形態たるミシン1では、上軸の位相の150〜270°の範囲で送り歯31の先端部は針板13の上面より下方に位置するように設定されている。   The rotation speed of the ellipse motion of the feed dog 31 is the same as the rotation speed of the lower shaft 17, and the rotation speed of the lower shaft 17 is the same as the rotation speed of the upper shaft. The appearing cycle coincides with the vertical movement cycle of the needle bar 11 and the rotation cycle of the upper shaft. Further, the feed dog 31 always appears on the upper surface of the needle plate 13 in the same section in the phase of the upper axis (when the angle is 0 °, the rotation angle from 0 °), and the feed dog 31 in the other sections. The front end of the needle plate 13 is located below the upper surface of the needle plate 13. In the sewing machine 1 according to the present embodiment, the distal end portion of the feed dog 31 is set to be positioned below the upper surface of the needle plate 13 in the range of 150 to 270 ° of the phase of the upper shaft.

(送り量調節機構)
図2乃至図4に基づいて、送り量調節機構40について詳説する。図4は送り量調節機構40の駆動源たる後述するステッピングモータ43の周辺構成を示す構成図である。
送り量調節機構40は、前述した送り量調節リンク体34の他端部に連結された角駒41と、この角駒41を往復移動可能に支持すると共にその往復移動方向をX−Z平面に沿ったいずれかの方向に可変調節可能な角駒支持体42と、角駒支持体42による角駒41の往復移動方向を可変調節するための駆動源となる調節動作駆動手段としてステッピングモータ43と、ステッピングモータ43の出力軸により揺動される主動リンク体44と、角駒支持体42に固定支持された従動リンク体45と、主動リンク体44と従動リンク体45とを連結する伝達リンク体46と、原点位置検出手段47を備えている。
(Feed adjustment mechanism)
The feed amount adjusting mechanism 40 will be described in detail with reference to FIGS. FIG. 4 is a configuration diagram showing a peripheral configuration of a stepping motor 43 which will be described later, which is a drive source of the feed amount adjusting mechanism 40.
The feed amount adjusting mechanism 40 supports the square piece 41 connected to the other end of the above-described feed amount adjustment link body 34, supports the square piece 41 so as to be able to reciprocate, and sets the reciprocating direction in the XZ plane. A stepping motor 43 serving as an adjustment operation driving means serving as a driving source for variably adjusting the reciprocating direction of the square piece 41 by the square piece support 42; The main link body 44 that is swung by the output shaft of the stepping motor 43, the driven link body 45 that is fixedly supported by the square piece support 42, and the transmission link body that connects the main link body 44 and the driven link body 45. 46 and origin position detecting means 47 are provided.

角駒支持体42は、円柱状に形成されると共にその中心線を基準に回転可能に図示しないミシンフレームに支持されている。そして、円柱形状の直径方向に沿って角駒41を支持するガイド溝42aが形成されている。つまり、角駒支持体42は、回転操作を加えられることで角駒41の往復移動方向を可変調節することができる。
従動リンク体45は角駒支持体42の中心線方向一端部において、当該角駒支持体42の直径方向に沿って固定装備されている。
The square piece support 42 is formed in a columnar shape and is supported by a sewing machine frame (not shown) so as to be rotatable with respect to the center line thereof. And the guide groove 42a which supports the square piece 41 is formed along the cylindrical diameter direction. That is, the square piece support 42 can variably adjust the reciprocating direction of the square piece 41 by being subjected to a rotation operation.
The follower link body 45 is fixedly installed along the diameter direction of the square piece support 42 at one end in the center line direction of the square piece support 42.

一方、主動リンク体44は、ステッピングモータ43の回転駆動半径方向に沿った状態でその出力軸に一端部が固定支持されており、その他端部が伝達リンク体46を介して従動リンク体45の一端部と連結されている。これにより、ステッピングモータ43の回転駆動力が従動リンク体45を介して角駒支持体42を回転させる。つまり、ステッピングモータの駆動量(回転角度変化量)に応じて、角駒41が送り歯31の送り量を規定することとなる。   On the other hand, one end of the main link 44 is fixedly supported on the output shaft in a state along the rotational drive radial direction of the stepping motor 43, and the other end of the main link 45 is connected to the driven link 45 via the transmission link 46. It is connected with one end. As a result, the rotational driving force of the stepping motor 43 rotates the square piece support 42 via the driven link body 45. That is, the square piece 41 defines the feed amount of the feed dog 31 according to the driving amount (rotational angle change amount) of the stepping motor.

前述したように、角駒41はZ軸方向に沿って往復移動を行うときには送り歯31の送り量を0に設定する。そして、本件では角駒41がZ軸方向に沿って往復移動を行うように、角駒支持体42の回転角度を規定するステッピングモータ43の出力軸の角度をステッピングモータ43の原点(動作原点)とする。かかるステッピングモータ43の原点位置は、主動リンク体44の揺動端部が所定位置にあるか否かにより検出することが可能である。従って、原点位置検出手段47は、主動リンク体43の先端部に固定装備された被検出部材47aと、ステッピングモータ43が前述した原点位置にある場合に被検出部材47aの存在を認識する近接センサ47bとから構成されている。この近接センサ47bの出力は、制御回路50に出力される。   As described above, the square piece 41 sets the feed amount of the feed dog 31 to 0 when reciprocating along the Z-axis direction. In this case, the angle of the output shaft of the stepping motor 43 that defines the rotation angle of the square piece support 42 is set to the origin of the stepping motor 43 (operation origin) so that the square piece 41 reciprocates along the Z-axis direction. And The origin position of the stepping motor 43 can be detected based on whether or not the rocking end of the main link body 44 is at a predetermined position. Therefore, the origin position detection means 47 is a proximity sensor that recognizes the presence of the detected member 47a when the detected member 47a is fixedly installed at the tip of the main link body 43 and the stepping motor 43 is at the aforementioned origin position. 47b. The output of the proximity sensor 47b is output to the control circuit 50.

(布押さえ手段)
布押さえ手段14は、針棒11に隣接して、その長手方向がZ軸方向に沿った状態で当該長手方向に移動可能にミシンフレームに支持された支持棒14aと、支持棒14aの下端部に固定支持された押さえ部材14bと、支持棒14aを介して押さえ部材14bを上下(Z軸方向)に移動操作する図示しない昇降レバーとを備えている。この布押さえ手段14は、押さえ部材14bを上位置と下位置とに切り替え可能であり、下位置に切り替えた状態において、押さえ部材14bが送り歯31の真上となる配置に設定されている。また、支持棒14aを介して下位置にある押さえ部材14bが下側に向かって押圧するように図示しない押圧バネが設けられている。
(Cloth holding means)
The cloth presser means 14 is adjacent to the needle bar 11 and has a support bar 14a supported by the sewing machine frame so that the longitudinal direction of the cloth presser 14 is movable along the Z-axis direction, and a lower end portion of the support bar 14a. A pressing member 14b fixedly supported by the head and a lifting lever (not shown) that moves the pressing member 14b up and down (in the Z-axis direction) via the support bar 14a. The cloth pressing means 14 can switch the pressing member 14b between an upper position and a lower position, and is set to be disposed so that the pressing member 14b is directly above the feed dog 31 in a state where the pressing member 14b is switched to the lower position. Further, a pressing spring (not shown) is provided so that the pressing member 14b at the lower position presses downward via the support bar 14a.

従って、押さえ部材14bを下位置を切り替えた状態において、針板13上にある布地を上方から押圧保持することとなる。以下、押さえ部材14bが下位置にある状態を布保持状態といい、上位置にある状態を解除状態という。
布押さえ手段14が布保持状態にあるときに、送り歯31の先端部が針板13の上面より上位置に来ると、布地を介して送り歯31が押さえ部材14bに押圧されることとなり、送り歯31が布地に効果的に接触して、布送りを有効に行うことができる。
Accordingly, the cloth on the needle plate 13 is pressed and held from above in a state where the lower position of the pressing member 14b is switched. Hereinafter, the state in which the pressing member 14b is in the lower position is referred to as a cloth holding state, and the state in the upper position is referred to as a released state.
When the cloth pressing means 14 is in the cloth holding state, if the tip of the feed dog 31 is located above the upper surface of the needle plate 13, the feed dog 31 is pressed against the pressing member 14b through the cloth. The feed dog 31 can effectively come into contact with the fabric and the fabric feed can be performed effectively.

(縫い針、針駆動機構及び針振り機構)
縫い針は、針棒11の下端部に装備され、針棒11は針駆動機構に支持される。そして、縫い針は、針棒11を介して上下方向の往復駆動が行われる。針駆動機構は、ミシンモータ12による上軸の回転駆動力を図示しないクランク機構やカム機構等を用いて往復上下方向の駆動力に変換すると共に、針棒11を支持する上下移動体(図示略)に往復上下の移動力の付与を行っている。
かかる移動体は、針棒11を、X軸方向を中心として揺動可能に支持されており、これにより、針棒11の先端に位置する縫い針をY軸方向に沿って揺動させる。針振り機構は、針振り用ステッピングモータ61を備え、リンク体を介して移動体に支持された針棒11に揺動力の付与を行い、上下動を行う針棒11に対して所定のタイミングで針振りを実行させている。なお、針振り方向はY軸方向に沿っており、布送り方向はX軸方向に沿っており、互いに直交していることから、布送りと針振りとを組み合わせることで縫い方向及び針落ち位置を任意に設定することを可能としている。
(Sewing needle, needle drive mechanism and needle swing mechanism)
The sewing needle is provided at the lower end of the needle bar 11, and the needle bar 11 is supported by the needle drive mechanism. The sewing needle is reciprocated in the vertical direction via the needle bar 11. The needle driving mechanism converts the rotational driving force of the upper shaft by the sewing machine motor 12 into a reciprocating vertical driving force using a crank mechanism, a cam mechanism or the like (not shown), and a vertical moving body (not shown) that supports the needle bar 11. ) Is given a reciprocating vertical movement force.
The movable body supports the needle bar 11 so as to be swingable about the X-axis direction, and thereby swings the sewing needle located at the tip of the needle bar 11 along the Y-axis direction. The needle swinging mechanism includes a needle swinging stepping motor 61, applies a swinging force to the needle bar 11 supported by the moving body via the link body, and at a predetermined timing with respect to the needle bar 11 that moves up and down. The needle swing is executed. The needle swinging direction is along the Y-axis direction, the cloth feed direction is along the X-axis direction, and is orthogonal to each other. Can be set arbitrarily.

(ミシンの制御系)
次いで、ミシン1の制御系について、図5を用いて説明する。図5は、ミシン1の制御系を示すブロック図である。
制御装置50は、図5に示すように、ミシン1の後述する各処理を実行するための処理プログラム又は処理データが書き込まれているROM52と、処理プログラムに従って上記各処理を実行するCPU51と、CPU51の各種処理データを記憶するRAM53と、上軸の回転角度(位相)を検出する上軸位相検出装置69とを備えている。また、上記RAM53には、種々のワークメモリやカウンタなどが設けられており、処理におけるワークエリアとしても使用される。
(Sewing machine control system)
Next, the control system of the sewing machine 1 will be described with reference to FIG. FIG. 5 is a block diagram showing a control system of the sewing machine 1.
As shown in FIG. 5, the control device 50 includes a ROM 52 in which a processing program or processing data for executing processing to be described later of the sewing machine 1 is written, a CPU 51 that executes each processing according to the processing program, and a CPU 51. RAM 53 for storing the various processing data and an upper axis phase detector 69 for detecting the rotation angle (phase) of the upper axis. The RAM 53 is provided with various work memories and counters, and is also used as a work area for processing.

制御装置50は、図示していない入力インターフェースを介してミシンモータ12、その回転数を検出する回転数検出手段としてのエンコーダ62、操作レバー15の操作量を検出するポテンショメータ63、送り機構30の送り量の設定動作を行うステッピングモータ43、針振りを行う針振り用ステッピングモータ61、ミシンモータ12の回転数を調節する操作ペダル16、各種設定の入力と各種情報の表示を行う操作パネル54、ステッピングモータ43の原点検出を行う近接センサ47bとが接続されている。   The control device 50 is connected to the sewing machine motor 12 through an input interface (not shown), an encoder 62 as a rotation speed detecting means for detecting the rotation speed, a potentiometer 63 for detecting the operation amount of the operation lever 15, and a feed of the feed mechanism 30. A stepping motor 43 for setting the amount, a stepping motor 61 for swinging the needle, an operation pedal 16 for adjusting the rotational speed of the sewing machine motor 12, an operation panel 54 for inputting various settings and displaying various information, a stepping A proximity sensor 47b that detects the origin of the motor 43 is connected.

上記操作ペダル16は、その踏量に応じた信号を出力し、制御装置50のCPU51はその信号出力に応じた回転数でミシンモータ12を回転駆動する。なお、ミシンモータ12はその電源出力回路を介して制御装置50と接続され、駆動電流値の制御により回転数制御が行われる。
針振り用ステッピングモータ61は、CPU51により、エンコーダ62の出力から認識される針落ちタイミングに対する所定のタイミングで同期を図って駆動制御され、針振りにより縫い針を所定の針落ち位置に位置決めする。
The operation pedal 16 outputs a signal corresponding to the amount of depression, and the CPU 51 of the control device 50 rotationally drives the sewing machine motor 12 at a rotation speed corresponding to the signal output. The sewing machine motor 12 is connected to the control device 50 through its power supply output circuit, and the rotational speed is controlled by controlling the drive current value.
The needle swing stepping motor 61 is driven and controlled by the CPU 51 at a predetermined timing with respect to the needle drop timing recognized from the output of the encoder 62, and positions the sewing needle at a predetermined needle drop position by the needle swing.

操作パネル54は、送り量の設定ボタンをはじめ各種の入力ボタンが切り替え表示されたり、必要に応じて縫製状態や各種設定情報、ミシンの使用者に対する操作指示の表示を行う。
ポテンショメータ63は、手動により布送り量の設定入力を行う操作レバー15の操作量を検出するためのものである。かかるポテンショメータ63の検出操作量に応じて、CPU51は、ステッピングモータ43を駆動して、所定の送り量となるように角駒支持体42の回転角度を設定する。
ここで、通常、このミシンでは、前記操作パネル54により設定された針振り量や送り量に基づき縫製が行なわれ、縫製開始時ないし縫製中において、CPU51はステッピングモータ43を駆動して角駒支持体42を所定角度だけ回転して送り量を設定された送り量とする。また、操作レバー15が作業者により操作されると、縫製中の送り量に関わらず該操作レバー15の操作量に応じてCPU51がステッピングモータ43を駆動して送り量を変更する。
The operation panel 54 displays various input buttons including a feed amount setting button, and displays a sewing state, various setting information, and an operation instruction for a sewing machine user as necessary.
The potentiometer 63 is for detecting the operation amount of the operation lever 15 for manually inputting the setting of the cloth feed amount. In accordance with the detected operation amount of the potentiometer 63, the CPU 51 drives the stepping motor 43 to set the rotation angle of the square piece support 42 so as to obtain a predetermined feed amount.
Here, normally, in this sewing machine, sewing is performed based on the needle swing amount and feed amount set by the operation panel 54, and the CPU 51 drives the stepping motor 43 at the start of sewing or during sewing to support the square piece. The body 42 is rotated by a predetermined angle to set the feed amount to the set feed amount. When the operation lever 15 is operated by the operator, the CPU 51 drives the stepping motor 43 according to the operation amount of the operation lever 15 to change the feed amount regardless of the feed amount during sewing.

(制御装置におけるステッピングモータの原点位置検出制御)
制御装置50におけるステッピングモータ43の原点位置検出制御について説明する。
CPU51は、ROM52に格納された各種のプログラムを実行することで以下の各機能を実現する。
(1)ミシン1の主電源入力時に、送り歯31が針板13の上面から出現しない期間となることを待つことなくステッピングモータ43の原点検出を行う予備原点検出機能
(2)縫製開始時(ミシンモータ12の起動時)に、送り歯31の出没周期の位相に基づいて、針板13の上面に送り歯31が出現しないときに、ステッピングモータ43の原点検出を行う適正時原点検出機能
(3)適正時原点検出機能による原点検出動作から予め設定された送り量となるようにステッピングモータ43の動作制御が完了するまでミシンモータ12の回転速度規制を行うミシンモータ回転速度規制機能
(Stepping motor home position detection control in the controller)
The origin position detection control of the stepping motor 43 in the control device 50 will be described.
The CPU 51 implements the following functions by executing various programs stored in the ROM 52.
(1) Preliminary origin detection function that detects the origin of the stepping motor 43 without waiting for the feed dog 31 not to appear from the upper surface of the needle plate 13 when the main power is input to the sewing machine 1 (2) At the start of sewing ( When the sewing machine motor 12 is started), when the feed dog 31 does not appear on the upper surface of the needle plate 13 based on the phase of the feed dog 31 protruding and retracting, the origin detection function at the proper time is performed to detect the origin of the stepping motor 43 ( 3) A sewing machine rotation speed restriction function for restricting the rotation speed of the sewing machine motor 12 until the operation control of the stepping motor 43 is completed so as to obtain a preset feed amount from the origin detection operation by the origin detection function when appropriate.

(1)の予備原点検出機能について説明する。原点検出は、CPU51が所定の制御プログラムを実行することで、ステッピングモータ43を所定の角度範囲で回転駆動させ、その途中で被検出部材47aが近接センサ47bに検出されると、そのときのステッピングモータ43の回転角度位置を原点と認識し、RAM53に記憶する処理を行う。
このとき、仮に、布押さえ手段14が送り歯31を押圧した状態ではステッピングモータ43の原点検出精度の低下を生じるが、少なくとも、主動リンク体44に設けられた被検出部材47aを近接センサ47bの近傍まで移動させておくことができるため、ミシンモータ12の駆動後のステッピングモータ43の原点検出に際して、被検出部材47aを正しい位置に短時間で導くことができ、ミシンモータ12駆動後の原点検出動作を迅速に行うことができる。
The preliminary origin detection function (1) will be described. In the origin detection, when the CPU 51 executes a predetermined control program to rotate the stepping motor 43 within a predetermined angle range, and the detected member 47a is detected by the proximity sensor 47b in the middle, the stepping at that time is detected. The rotational angle position of the motor 43 is recognized as the origin, and processing for storing in the RAM 53 is performed.
At this time, if the cloth presser 14 presses the feed dog 31, the origin detection accuracy of the stepping motor 43 is lowered, but at least the detected member 47 a provided on the main link body 44 is connected to the proximity sensor 47 b. Since it can be moved to the vicinity, when detecting the origin of the stepping motor 43 after driving the sewing machine motor 12, the detected member 47a can be guided to the correct position in a short time, and the origin can be detected after driving the sewing machine motor 12. The operation can be performed quickly.

(2)の適正時原点検出機能について説明する。ここで、「出没周期の位相」とは、送り歯31の一回送りを行う周期における位相を示すが、送り歯31の周期は、下軸17、上軸、ミシンモータ12の回転周期と同期しているので、これらから求めても良い。ミシン1では、上軸位相検出装置69により検出される上軸の回転角度の位相から求めている。
布押さえ手段14が送り歯31を押圧しているとステッピングモータ43の原点が精度良く検出されないことから、(1)の予備原点検出よりも精度良く原点検出を行うためには、送り歯31の先端部が針板13の上面よりも低位置となる時に行うように各部が制御される。
The proper origin detection function (2) will be described. Here, the “phase of the protrusion / departure cycle” indicates a phase in a cycle in which the feed dog 31 is fed once. The cycle of the feed dog 31 is synchronized with the rotation cycle of the lower shaft 17, the upper shaft, and the sewing machine motor 12. So, you may ask from these. In the sewing machine 1, it is obtained from the phase of the rotation angle of the upper shaft detected by the upper shaft phase detector 69.
Since the origin of the stepping motor 43 is not accurately detected when the cloth presser 14 is pressing the feed dog 31, in order to detect the origin more accurately than the preliminary origin detection of (1), the feed dog 31 Each part is controlled so as to be performed when the tip part is positioned lower than the upper surface of the needle plate 13.

上軸がいずれの回転角度位相区間にある場合に送り歯31の先端部が針板13の上面よりも低位置となるかは、各部材の設計段階で求めることが可能であることから、初期データとしてROM52に、上軸の角度区間について記憶するか、或いは後から同区間角度が求められた場合には使用者の入力によりRAM53或いは図示しない不揮発性メモリ等に記憶される。ミシン1の場合には、送り歯31の先端部が針板13の上面よりも低位置となる上軸の角度区間は、前述したように150〜270°の角度区間である。   Since it is possible to determine at the design stage of each member whether the tip of the feed dog 31 is lower than the upper surface of the needle plate 13 when the upper shaft is in any rotation angle phase section. The data is stored as data in the ROM 52 for the angle section of the upper axis, or when the same section angle is obtained later, it is stored in the RAM 53 or a non-illustrated non-volatile memory or the like by user input. In the case of the sewing machine 1, the angle section of the upper shaft where the tip of the feed dog 31 is lower than the upper surface of the needle plate 13 is an angle section of 150 to 270 ° as described above.

ミシンモータ12の起動が開始されると、CPU51は、予め記憶された送り歯31の先端部が針板13の上面よりも低位置となる上軸の回転角度区間を参照しつつ上軸位相検出装置69により上軸回転角度と比較する処理を行う。そして、検出上軸角度が送り歯31の先端部が針板13の上面よりも低位置となる上軸の角度区間になると、ステッピングモータ43の駆動により被検出部材47aを近接センサ47bにより検索し、検出されたミシンモータ43の角度を原点として再度更新記録する。   When the start of the sewing machine motor 12 is started, the CPU 51 detects the upper shaft phase while referring to the rotation angle section of the upper shaft where the tip portion of the feed dog 31 stored in advance is lower than the upper surface of the needle plate 13. The device 69 performs processing for comparison with the upper shaft rotation angle. When the detected upper shaft angle is in the upper shaft angle section where the tip of the feed dog 31 is lower than the upper surface of the needle plate 13, the proximity sensor 47b searches the detected member 47a by driving the stepping motor 43. The updated angle is recorded again with the detected angle of the sewing machine motor 43 as the origin.

(3)ミシンモータ回転速度規制機能について説明する。
CPU51は、ミシンモータ12の起動が開始され、(2)の処理による原点検出及び予め設定された送り量となるように、ステッピングモータ43により送り機構30に対する送り量設定動作が完了するまで、予め設定された規制回転速度にミシンモータ12の回転速度を規制する制御を行う。
ここで、ミシンモータ12の規制回転速度は、例えば、試験的な測定データに基づいて、起動開始して最初に上軸角度が150°を検出してから270°を検出するまでに原点検出及び送り量設定を完了させることが可能な回転速度とすることが望ましい。
(3) The sewing machine motor speed limiting function will be described.
The CPU 51 starts in advance until the start of the sewing machine motor 12 is completed and the feed amount setting operation for the feed mechanism 30 is completed by the stepping motor 43 so that the origin detection by the process of (2) and the preset feed amount are achieved. Control is performed to restrict the rotational speed of the sewing machine motor 12 to the set restricted rotational speed.
Here, the regulated rotational speed of the sewing machine motor 12 is determined based on, for example, experimental measurement data, the origin detection and the 270 ° detection from the first start of the upper shaft angle detection of 150 °. It is desirable to set the rotation speed so that the feed amount setting can be completed.

(制御装置における主要な制御に基づくミシンの動作説明)
上述した制御装置における主要な制御に基づくミシン1の動作説明を図6のフローチャートに基づいて説明する。
まず、ミシン1の主電源の入力をCPU51が認識すると(ステップS1)、上軸位相検出装置69により針棒11の上位置検出が行われる(ステップS2)。上位置とは縫い針先端が針板13の上面よりも高位置にある場合をいい、その状態は上軸の回転角度が一定範囲の状態と一致するので、上軸位相検出装置69の出力からCPU51は検出する。そして、針棒11が上位置にない場合には、操作パネル54に針棒11を上位置とするように報知表示を行う処理を実行する。そして、上位置となる状態が検出されるまで待ち状態となる。これに対してミシン1の使用者は、フレーム外部にある上軸のプーリ(図示略)を手動を回転させて針棒11を上位置にする操作を行う。
(Explanation of sewing machine operation based on main control in the control unit)
The operation of the sewing machine 1 based on the main control in the control device described above will be described based on the flowchart of FIG.
First, when the CPU 51 recognizes the input of the main power supply of the sewing machine 1 (step S1), the upper position of the needle bar 11 is detected by the upper shaft phase detector 69 (step S2). The upper position refers to the case where the sewing needle tip is higher than the upper surface of the needle plate 13, and this state matches the state of the rotation angle of the upper shaft within a certain range. The CPU 51 detects. Then, when the needle bar 11 is not in the upper position, a process for performing notification display on the operation panel 54 so that the needle bar 11 is in the upper position is executed. And it will be in a waiting state until the state which becomes an upper position is detected. On the other hand, the user of the sewing machine 1 performs an operation of manually rotating an upper shaft pulley (not shown) outside the frame to bring the needle bar 11 to the upper position.

次いで、CPU51は、予備原点検出処理を実行する。即ち、布押さえ手段14が送り歯31を押圧しているか否かにかかわらず、ステッピングモータ43の原点検出を実行する(ステップS3)。これにより、送り量調節機構40のステッピングモータ43の駆動により主動リンク体44の先端部にある被検出部材47aが近接センサ47bの検出位置に位置決めされる。   Next, the CPU 51 executes a preliminary origin detection process. That is, the origin detection of the stepping motor 43 is performed regardless of whether the cloth pressing means 14 is pressing the feed dog 31 (step S3). As a result, the detected member 47a at the tip of the main link body 44 is positioned at the detection position of the proximity sensor 47b by driving the stepping motor 43 of the feed amount adjusting mechanism 40.

次いで、CPU51は、操作ペダル16の入力待ちを行う(ステップS4)。
そして、操作ペダル16の入力を検出すると、CPU51は、ミシンモータ回転速度規制機能を実行し、その操作ペダル16による入力の示す回転数にかかわらずによる所定速度以下に規制された規制速度でミシンモータ12を駆動させる制御を行う(ステップS5)。
Next, the CPU 51 waits for input from the operation pedal 16 (step S4).
When the input of the operation pedal 16 is detected, the CPU 51 executes a sewing motor rotation speed restriction function, and the sewing machine motor is controlled at a restriction speed that is restricted below a predetermined speed regardless of the rotation speed indicated by the input by the operation pedal 16. Control to drive 12 is performed (step S5).

さらに、ミシンモータ12が起動させると、CPU51は、適正時原点検出機能を実行し、上軸角度検出を行う(ステップS6)。即ち、上軸位相検出装置69の検出出力から求まる上軸角度が150°以上になったか判定する。
そして、上軸角度が150°を越えると、原点検出を実行する処理を行う。即ち、CPU51は、ミシンモータ43を駆動して再度、被検出部材47aが近接センサ47bの検出位置となるように位置決めする(ステップS7)。これにより、布押さえ手段14による送り歯31に対する押圧の影響がない状態で高精度の原点検出が行われる。
Further, when the sewing machine motor 12 is activated, the CPU 51 executes the origin detection function at the appropriate time and detects the upper shaft angle (step S6). That is, it is determined whether the upper shaft angle obtained from the detection output of the upper shaft phase detector 69 is 150 ° or more.
Then, when the upper axis angle exceeds 150 °, the origin detection is performed. That is, the CPU 51 drives the sewing machine motor 43 to position the detected member 47a again so that it becomes the detection position of the proximity sensor 47b (step S7). Thereby, the origin detection with high accuracy is performed in a state where there is no influence of the pressing on the feed dog 31 by the cloth pressing means 14.

次いで、CPU51は、操作パネルにより設定送り量若しくは操作レバー15の操作によりポテンショメータ63からの検出により求まる設定送り量となるようにステッピングモータ43を駆動する動作制御を行う(ステップS8)。
そして、送り量設定が終わると、再び上軸角度検出を行い、検出角度が270°以上となったか否かを判定する(ステップS9)。そして、検出角度が270°以上となったら、ミシンモータ12の回転速度規制を解除して、操作ペダル16により入力される回転数となるようにミシンモータ12の回動速度制御を行う(ステップS10)。
そして、ステッピングモータ43の原点検出制御は終了し、通常の縫製制御に移行する。
Next, the CPU 51 performs operation control for driving the stepping motor 43 so as to obtain a set feed amount by the operation panel or a set feed amount obtained by detection from the potentiometer 63 by operating the operation lever 15 (step S8).
When the feed amount is set, the upper shaft angle is detected again to determine whether or not the detected angle is 270 ° or more (step S9). When the detected angle becomes 270 ° or more, the rotational speed restriction of the sewing machine motor 12 is released, and the rotational speed control of the sewing machine motor 12 is performed so that the rotational speed input by the operation pedal 16 is obtained (step S10). ).
Then, the origin detection control of the stepping motor 43 ends, and the routine proceeds to normal sewing control.

(実施形態の効果)
以上のように、本実施形態たるミシン1では、適正時原点検出機能により、送り歯31の先端部が針板13上面よりも低位置となる一定の位相区間であるか否かを上軸位相検出装置69により検出し、当該区間において、ステッピングモータ43の原点検出を行うことから、布押さえ手段14が送り歯31と非接触状態において原点検出が行われることとなり、布押さえ手段14による原点位置誤差の発生を回避し、精度良く原点検出を行うことが可能となる。
(Effect of embodiment)
As described above, in the sewing machine 1 according to the present embodiment, the upper axis phase determines whether or not the distal end portion of the feed dog 31 is in a certain phase interval lower than the upper surface of the needle plate 13 by the proper origin detection function. Since the origin is detected by the detection device 69 and the origin of the stepping motor 43 is detected in this section, the origin detection is performed when the cloth presser 14 is not in contact with the feed dog 31 and the origin position by the cloth presser 14 is detected. It is possible to avoid the generation of errors and perform origin detection with high accuracy.

また、ミシンモータ回転速度規制機能により、ミシンモータ12の回転速度規制を行った状態で、なお且つ、上軸角度が270°に至るまでに、ステッピングモータ43の原点検出及び送り量の設定を完了させるので、縫製開始の第一針目から、布押さえ手段14の影響を排除して精度良く求められたステッピングモータ43の原点を基準に送り量が設定されるので、送り量精度の高い縫い目形成が可能となり、縫い品質の向上を図る事が可能となる。   In addition, the origin detection of the stepping motor 43 and the setting of the feed amount are completed in a state where the rotational speed of the sewing machine motor 12 is restricted by the sewing motor rotational speed restriction function and the upper shaft angle reaches 270 °. Therefore, since the feed amount is set based on the origin of the stepping motor 43 obtained with high accuracy by eliminating the influence of the cloth pressing means 14 from the first stitch at the start of sewing, it is possible to form a stitch with high feed amount accuracy. This makes it possible to improve the sewing quality.

また、予備原点検出機能により、主電源入力時に、送り歯31が針板13の上面から出現しない期間であるか否かを判断することなく、予備原点検出が行われ、原点検出のためのステッピングモータ43の主動リンク体44に設けられた被検出部材47aの近接センサ47bに対する原点位置合わせがおおよそ行われた状態となるので、針板13の上面に送り歯31が出現しないときに行われる適正時原点検出機能における原点検出の際に、被検出部材47aが既に近接センサ47bに近接していることから、当該原点位置合わせを迅速に行うことが可能となり、高精度の原点検出を迅速に行うことができ、縫製開始時早期段階から送り量精度の高い縫い目を形成することが可能となり、さらなる縫い品質の向上を図ることが可能となる。   Further, the spare origin detection function performs the spare origin detection without determining whether or not the feed dog 31 does not appear from the upper surface of the needle plate 13 when the main power is input, and the stepping for origin detection is performed. Since the origin position alignment of the detected member 47a provided on the main link body 44 of the motor 43 with respect to the proximity sensor 47b is approximately performed, the appropriateness to be performed when the feed dog 31 does not appear on the upper surface of the needle plate 13. Since the detected member 47a is already close to the proximity sensor 47b at the time of origin detection in the hour origin detection function, it is possible to quickly perform the origin alignment, and quickly perform highly accurate origin detection. Therefore, it is possible to form a seam with high feed amount accuracy from an early stage at the start of sewing, and to further improve the sewing quality.

(その他)
上記実施形態にあっては、布押さえ手段14が送り歯31が加圧しない状態のときに原点検出を行う構成としたが、布押さえ手段14にマイクロスイッチ,近接スイッチ,光学素子により物体の有無を検出する光学センサ等を併設して、該布押さえ手段14の下位置にある状態(布保持状態)および上位置にある状態(解除状態)との少なくとも一方を検出する布押さえ検出手段を設けてもよい。
(Other)
In the above embodiment, the origin detection is performed when the cloth presser 14 is in a state in which the feed dog 31 is not pressurized. A cloth presser detecting means for detecting at least one of a state in the lower position (cloth holding state) and a state in the upper position (released state) is provided along with an optical sensor for detecting May be.

即ち、制御装置50のCPU51は所定のプログラムにより、原点検出時、例えば、主電源入力時、縫製開始時などにおいて、まず、前記布押さえ検出手段により布押さえ手段が上位置にあるか下位置にあるかを検出し、布押さえ手段14が上位置(解除状態)にあることを検出したら、原点位置検出手段47によるステッピングモータ43の原点検出を行う。一方、布押さえ手段14が下位置(布保持状態)にあることを検出したら、CPU51を介して操作パネル54(報知手段)により作業者に対して布押さえ手段14の上位置への移動指示を行い、布押さえ検出手段により布押さえ手段14の上位置が検出されるまで待ち状態とし、上位置が検出されてからステッピングモータ43の原点検出を行う動作制御を行う。ここでは、布押さえ検出手段は布押さえ手段14の上位置・下位置とも検出可能な構成とした。また、報知手段として操作パネル54を用いたが、布押さえ手段14の上位置への移動指示は、ダイオードの点滅やアラーム音など、直接的な指示でなくても、該移動を促す意図のあるものであればよい。
尚、布押さえ検出手段が布押さえ手段14の上位置ないし下位置のどちらか一方しか検出できない構成とした場合は、例えば、下位置にある状態(布保持状態)しか検出できない構成では、下位置が検出されない時には上位置(解除状態)であると判断するようにすればよい。
また、上述のような布押さえ検出手段を備えた構成の場合においては、動作制御手段により、布押さえ検出手段が布押さえ手段14の解除状態を検出した場合にはそのまま調整動作駆動手段の原点検出を行い、布押さえ検出手段は布押さえ手段14の布保持状態を検出した場合には前述の実施例に従い送り歯が針板上面に出現しない位相で調節動作駆動手段の原点検出を行う、ような制御を行うようにしても良い。
That is, the CPU 51 of the control device 50 first detects whether the cloth presser means is at the upper position or the lower position by the cloth presser detection means when the origin is detected, for example, when the main power is input or when sewing is started, according to a predetermined program. When it is detected that the cloth presser 14 is in the upper position (released state), the origin of the stepping motor 43 is detected by the origin position detector 47. On the other hand, when it is detected that the cloth pressing means 14 is in the lower position (cloth holding state), an instruction to move the cloth pressing means 14 to the upper position is given to the operator by the operation panel 54 (notification means) via the CPU 51. The operation is performed until the upper position of the cloth presser 14 is detected by the cloth presser detecting means, and the operation control for detecting the origin of the stepping motor 43 is performed after the upper position is detected. Here, the cloth press detection means is configured to detect both the upper and lower positions of the cloth press means 14. Further, although the operation panel 54 is used as the notification means, the movement instruction to the upper position of the cloth pressing means 14 is intended to prompt the movement even if it is not a direct instruction such as blinking of a diode or an alarm sound. Anything is acceptable.
If the cloth presser detection means can detect only one of the upper position and the lower position of the cloth presser means 14, for example, in the structure that can detect only the lower position (cloth holding state), the lower position When is not detected, it may be determined to be in the upper position (released state).
Further, in the case of the configuration provided with the cloth presser detection means as described above, when the operation control means detects the release state of the cloth presser means 14, the origin detection of the adjustment operation drive means is performed as it is. The cloth presser detection means detects the origin of the adjustment operation drive means at a phase where the feed dog does not appear on the upper surface of the needle plate according to the above-described embodiment when the cloth holding state of the cloth presser means 14 is detected. Control may be performed.

また、布押さえ手段14の上位置と下位置を切り替えるソレノイド、アクチュエータ等の切り替え駆動手段を設け、上記と同様の布押さえ検出手段を布押さえ手段14に併設する構成としても良い。
この場合、制御装置50のCPU51は所定のプログラムにより、原点検出時、例えば、主電源入力時、縫製開始時等において、布押さえ手段14が下位置にある状態を検出した場合に、切り替え駆動手段を駆動させて布押さえ手段14を上位置へ切り替えてからステッピングモータ43の原点検出を行う動作制御を行う。
Further, a switching drive means such as a solenoid or an actuator for switching the upper position and the lower position of the cloth pressing means 14 may be provided, and a cloth pressing detection means similar to the above may be provided in the cloth pressing means 14.
In this case, when the CPU 51 of the control device 50 detects a state where the cloth presser means 14 is in the lower position at the time of origin detection, for example, at the time of main power input, sewing start, etc., according to a predetermined program, the switching drive means , And the cloth presser 14 is switched to the upper position, and then the operation control for detecting the origin of the stepping motor 43 is performed.

上記各構成にあっても、送り歯31が布押さえ手段14による押圧状態を回避して原点検出を行うことができ、布押さえ手段14によるステッピングモータ43の原点位置誤差の発生を回避し、精度良く原点検出を行うことが可能となる。   Even in each of the above configurations, the feed dog 31 can perform the origin detection while avoiding the pressing state by the cloth pressing means 14, and the occurrence of the origin position error of the stepping motor 43 by the cloth pressing means 14 can be avoided. The origin can be detected well.

なお、上述の実施例では調節動作駆動手段としてステッピングモータによる説明に終始したが、ステッピングモータのみに限られるものではなく、サーボモータを始め任意の位置(駆動量)で停止が可能なアクチュエータであれば何を用いても良い。   In the above-described embodiment, the description is made with the stepping motor as the adjustment operation driving means. However, the stepping motor is not limited to the stepping motor, and any actuator that can be stopped at an arbitrary position (driving amount) including the servo motor. Anything can be used.

本実施の形態に係る送り機構を備えたミシンの全体構成を説明するための概略図である。It is the schematic for demonstrating the whole structure of the sewing machine provided with the feed mechanism which concerns on this Embodiment. 図1のII−II部分の断面図である。It is sectional drawing of the II-II part of FIG. 図2のIII−III部分の断面図である。It is sectional drawing of the III-III part of FIG. 図2に開示された送り機構のステッピングモータ近傍の構成を説明するための説明図である。It is explanatory drawing for demonstrating the structure of the stepping motor vicinity of the feed mechanism disclosed by FIG. 本発明の実施形態たるミシンの制御系を示すブロック図である。It is a block diagram which shows the control system of the sewing machine which is embodiment of this invention. 本発明の実施形態たるミシンの制御装置における主要な制御に基づくフローチャートである。It is a flowchart based on main control in the control apparatus of the sewing machine which is embodiment of this invention.

符号の説明Explanation of symbols

1 ミシン
11 針棒
12 ミシンモータ
13 針板
14 布押さえ手段
17 下軸
30 送り機構
31 送り歯
40 送り量調節機構
43 ステッピングモータ(調節動作駆動手段)
44 主動リンク体
47 原点位置検出手段
47a 被検出部材
47b 近接センサ
50 制御装置(動作制御手段)
54 操作パネル(報知手段)
62 エンコーダ
DESCRIPTION OF SYMBOLS 1 Sewing machine 11 Needle bar 12 Sewing machine motor 13 Needle plate 14 Cloth presser 17 Lower shaft 30 Feed mechanism 31 Feed dog 40 Feed amount adjustment mechanism 43 Stepping motor (Adjustment operation drive means)
44 Main link body 47 Origin position detection means 47a Detected member 47b Proximity sensor 50 Control device (operation control means)
54 Operation panel (notification means)
62 Encoder

Claims (5)

縫い針を上下動させる針駆動機構と、
前記針駆動機構に同期して送り歯を針板上面に出没させる送り機構と、
前記送り歯の出没位置にて前記針板上面を押圧して、縫製時の布押さえを行う布押さえ手段と、
前記送り機構に作用して一針当りの布送り量を調節可能な送り量調節機構と、
前記送り量調節機構による送り量調節動作の駆動を行う調節動作駆動手段と、
前記調節動作駆動手段の動作原点を検出する原点位置検出手段と、
前記調節動作駆動手段の駆動量を制御する動作制御手段と、を備え、
前記動作制御手段が、前記送り歯の出没周期の位相に基づいて、前記針板の上面に前記送り歯が出現しないときに、前記原点位置検出手段により前記調節動作駆動手段の原点検出を行うことを特徴とするミシン。
A needle drive mechanism that moves the sewing needle up and down;
A feed mechanism that causes the feed dog to appear and disappear on the upper surface of the needle plate in synchronization with the needle drive mechanism;
Cloth presser means for pressing the upper surface of the needle plate at the position where the feed dog appears and presses the cloth plate during sewing;
A feed amount adjusting mechanism that can act on the feed mechanism to adjust the cloth feed amount per stitch;
Adjustment operation drive means for driving a feed amount adjustment operation by the feed amount adjustment mechanism;
Origin position detection means for detecting the operation origin of the adjustment action drive means;
Operation control means for controlling the drive amount of the adjustment operation drive means,
The operation control means detects the origin of the adjustment operation drive means by the origin position detection means when the feed dog does not appear on the upper surface of the needle plate based on the phase of the feed dog's protrusion and withdrawal period. A sewing machine characterized by
前記動作制御手段は、前記原点検出から、当該原点検出により検出された原点に基づいて前記調節動作駆動手段による送り量の設定動作が完了するまでの期間について、前記送り機構の駆動速度を所定速度以下に規制することを特徴とする請求項1記載のミシン。 The operation control means sets the drive speed of the feed mechanism to a predetermined speed for a period from the origin detection to the completion of the feed amount setting operation by the adjustment operation drive means based on the origin detected by the origin detection. 2. The sewing machine according to claim 1, wherein the sewing machine is regulated as follows. 前記動作制御手段は、前記送り歯が前記針板の上面から出現しない期間となることを待つことなく、前記調節動作駆動手段の予備原点検出を行うことを特徴とする請求項1又は2記載のミシン。 The said operation control means performs the preliminary | backup origin detection of the said adjustment operation drive means, without waiting for it to become a period when the said feed dog does not appear from the upper surface of the said needle plate, The characterized by the above-mentioned. sewing machine. 縫い針を上下動させる針駆動機構と、
前記針駆動機構に同期して送り歯を針板上面に出没させる送り機構と、
前記送り歯の出没位置にて前記針板上面を押圧する布保持状態とその解除状態を切り替え可能に設けられた布押さえ手段と、
少なくとも前記布押さえ手段の布保持状態又は解除状態を検出する布押さえ検出手段と、
前記送り機構に作用して一針当りの布送り量を調節可能な送り量調節機構と、
前記送り量調節機構による送り量調節動作の駆動を行う調節動作駆動手段と、
前記調節動作駆動手段の動作原点を検出する原点位置検出手段と、
前記調節動作駆動手段の駆動量を制御する動作制御手段と、
前記布押さえ手段の布保持状態の解除指示を報知する報知手段と、を備え、
前記動作制御手段は、前記調節動作駆動手段の原点検出時に、前記布押さえ検出手段により布保持状態が検出された時には前記報知手段により布保持状態の解除指示を報知し、布押さえ検出手段により解除状態が検出された時には前記原点位置検出手段による原点検出を行うことを特徴とするミシン。
A needle drive mechanism that moves the sewing needle up and down;
A feed mechanism that causes the feed dog to appear and disappear on the upper surface of the needle plate in synchronization with the needle drive mechanism;
A cloth presser means provided so as to be able to switch between a cloth holding state for pressing the upper surface of the needle plate and a release state thereof at the position where the feed dog appears and disappears;
A cloth presser detection means for detecting at least a cloth holding state or a release state of the cloth presser means;
A feed amount adjusting mechanism that can act on the feed mechanism to adjust the cloth feed amount per stitch;
Adjustment operation drive means for driving a feed amount adjustment operation by the feed amount adjustment mechanism;
Origin position detection means for detecting the operation origin of the adjustment action drive means;
Operation control means for controlling the drive amount of the adjustment operation drive means;
An informing means for informing an instruction to cancel the cloth holding state of the cloth holding means,
When the origin of the adjustment operation driving means is detected, the operation control means notifies the cloth holding state release instruction by the notification means when the cloth holding state is detected by the cloth press detection means, and the cloth press detection means releases the cloth holding state. A sewing machine that performs origin detection by the origin position detecting means when a state is detected.
縫い針を上下動させる針駆動機構と、
前記針駆動機構に同期して送り歯を針板上面に出没させる送り機構と、
前記送り歯の出没位置にて前記針板上面を押圧する布保持状態とその解除状態を切り替え可能に設けられた布押さえ手段と、
少なくとも前記布押さえ手段の布保持状態又は解除状態を検出する布押さえ検出手段と、
前記送り機構に作用して一針当りの布送り量を調節可能な送り量調節機構と、
前記送り量調節機構による送り量調節動作の駆動を行う調節動作駆動手段と、
前記調節動作駆動手段の動作原点を検出する原点位置検出手段と、
前記調節動作駆動手段の駆動量を制御する動作制御手段とを備え、
前記布押さえ手段は、前記布保持状態と解除状態の切り替え駆動動作を付与する切り替え駆動手段を備えると共に、
前記動作制御手段は、前記調節動作駆動手段の原点検出時に、前記布押さえ検出手段により布保持状態を検出した場合に、前記切り替え駆動手段により前記布押さえ手段の布保持状態を解除させて調節動作駆動手段の原点検出を行うことを特徴とするミシン。
A needle drive mechanism that moves the sewing needle up and down;
A feed mechanism that causes the feed dog to appear and disappear on the upper surface of the needle plate in synchronization with the needle drive mechanism;
A cloth presser means provided so as to be able to switch between a cloth holding state for pressing the upper surface of the needle plate and a release state thereof at the position where the feed dog appears and disappears;
A cloth presser detection means for detecting at least a cloth holding state or a release state of the cloth presser means;
A feed amount adjusting mechanism that can act on the feed mechanism to adjust the cloth feed amount per stitch;
Adjustment operation drive means for driving a feed amount adjustment operation by the feed amount adjustment mechanism;
Origin position detection means for detecting the operation origin of the adjustment action drive means;
Operation control means for controlling the drive amount of the adjustment operation drive means,
The cloth pressing means includes switching drive means for applying a switching drive operation between the cloth holding state and the release state,
The operation control means, when detecting the origin of the adjustment operation driving means, detects the cloth holding state by the cloth press detection means, and cancels the cloth holding state of the cloth press means by the switching drive means. A sewing machine characterized in that the origin of the driving means is detected.
JP2003378908A 2003-11-07 2003-11-07 Sewing machine Pending JP2005137694A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102277696A (en) * 2010-06-09 2011-12-14 Vsm集团股份公司 feeder movement compensation
CN103205864A (en) * 2012-01-11 2013-07-17 苏州市豪杰机械电子设备有限公司 Motor control sewing machine feeding mechanism
CN103469499A (en) * 2013-09-23 2013-12-25 星锐缝纫机(嘉兴)有限公司 Fabric conveying mechanism for back tacking of sewing machine
CN107761273A (en) * 2016-08-23 2018-03-06 Juki株式会社 Sewing machine
CN108560151A (en) * 2018-06-22 2018-09-21 北京大豪科技股份有限公司 Overedger control system, control method and overedger
CN114293324A (en) * 2021-12-28 2022-04-08 福恩达机器人(昆山)有限公司 Multilayer cloth eating capacity adjustable mechanism

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102277696A (en) * 2010-06-09 2011-12-14 Vsm集团股份公司 feeder movement compensation
CN103205864A (en) * 2012-01-11 2013-07-17 苏州市豪杰机械电子设备有限公司 Motor control sewing machine feeding mechanism
CN103469499A (en) * 2013-09-23 2013-12-25 星锐缝纫机(嘉兴)有限公司 Fabric conveying mechanism for back tacking of sewing machine
CN107761273A (en) * 2016-08-23 2018-03-06 Juki株式会社 Sewing machine
CN108560151A (en) * 2018-06-22 2018-09-21 北京大豪科技股份有限公司 Overedger control system, control method and overedger
CN108560151B (en) * 2018-06-22 2024-02-27 北京大豪科技股份有限公司 Overedger control system, control method and overedger
CN114293324A (en) * 2021-12-28 2022-04-08 福恩达机器人(昆山)有限公司 Multilayer cloth eating capacity adjustable mechanism

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