公开(公告)号：US4431955A

公开(公告)日：1984-02-14

申请号：US326783

申请日：1981-12-02

申请人： Leonardo Faedi ,  Maurizio Bertoli

发明人： Leonardo Faedi ,  Maurizio Bertoli

IPC分类号： H02P8/12 ,  H02P8/32 ,  H02K29/04

CPC分类号： H02P8/32

摘要： Step motor control circuit of the "current chopping" type where, according to the required operative conditions, both the energization current level and the "chopping" frequency is varied. When the current level applied to the motor phases is high, a relatively low chopping frequency is used and, on the contrary, when the current level is low a relatively high chopping frequency is used. Particularly, this allows the use of chopping ultrasonic frequency for the holding operative condition of the motor, where a low energization current level suffices, without causing unacceptable power losses in the current switching components. This has the advantage of eliminating under such condition, the motor noise due to the pulsating electrodynamic actions to which the motor is subjected.

摘要翻译： “电流斩波”型的步进电动机控制电路，其中根据所需的工作条件，通电电流电平和“斩波”频率均有所不同。 当施加到电动机相位的电流电平高时，使用相对较低的斩波频率，相反，当电流电平低时，使用相对较高的斩波频率。 特别地，这允许使用斩波超声波频率用于电动机的保持操作状态，其中低通电电流电平足够，而不会导致当前开关部件中的不可接受的功率损耗。 这具有在这种条件下消除由于电动机所经受的脉动电动作用引起的电动机噪声的优点。

公开(公告)号：US4365291A

公开(公告)日：1982-12-21

申请号：US35861

申请日：1979-05-03

申请人： Vittorio Zanchi ,  Tiziano Maccianti

发明人： Vittorio Zanchi ,  Tiziano Maccianti

IPC分类号： G06F13/18 ,  G06F13/42 ,  G06F13/00

CPC分类号： G06F13/4239 ,  G06F13/18

摘要： A system comprising interface circuits for coupling together for bidirectional information communication the various units of a data processing system, wherein such communication is effected by a totally interlocked bidirectional dialogue carried out over a single lead, but utilizing signals transmitted on another lead of the interface for clearing the interface circuits associated with the single lead.

摘要翻译： 一种包括用于耦合在一起用于双向信息通信数据处理系统的各种单元的接口电路的系统，其中这种通信是通过在单个引线上执行的完全互锁的双向对话实现的，但是利用在该接口的另一个引线上传输的信号 清除与单个引线相关的接口电路。

公开(公告)号：US4249253A

公开(公告)日：1981-02-03

申请号：US973448

申请日：1978-12-26

申请人： Claudio Gentili ,  Calogero Mantellina ,  Alessandro Scotti

发明人： Claudio Gentili ,  Calogero Mantellina ,  Alessandro Scotti

IPC分类号： G06F11/10 ,  G06F12/16 ,  G11C29/00

CPC分类号： G06F11/1052

摘要： A memory system wherein data is stored along with a SEC-DED error detecting and correcting code. Means are provided for selecting either a direct readout path for data from the memory when no readout errors have been detected for the memory address being accessed, or an alternate readout path including circuits for checking and correcting errors when an error condition has been detected. An auxiliary memory is provided for storing error flag bits indicating memory zones which have produced erroneous readouts, whereby the system is controlled such that high speed direct read cycles are executed for no-error memory zones and optimum memory accessing time is achieved without sacrificing the reliability achieved through use of the error correcting codes.

摘要翻译： 存储系统，其中数据与SEC-DED错误检测和校正码一起存储。 提供了用于当没有检测到正被访问的存储器地址的读出错误时选择来自存储器的数据的直接读出路径的装置，或者包括用于当检测到错误状况时检查和校正错误的电路的备选读出路径。 提供了一个辅助存储器，用于存储指示已经产生错误读出的存储器区域的错误标志位，由此系统被控制，使得对无错误存储器区域执行高速直接读取周期，并且在不牺牲可靠性的情况下实现最佳存储器访问时间 通过使用纠错码实现。

公开(公告)号：US4133051A

公开(公告)日：1979-01-02

申请号：US535267

申请日：1974-12-23

申请人： Claudio Gentili

发明人： Claudio Gentili

IPC分类号： G11C11/404 ,  G11C11/405 ,  G11C11/406 ,  G11C13/00 ,  G11C11/40

CPC分类号： G11C11/406 ,  G11C11/404 ,  G11C11/405

摘要： A semiconductor memory is provided with means for refreshing the memory. Interrupt requests generated by the memory initiate refreshing cycles which are uniformly distributed during periods of normal operation of the memory, each cycle for a row of the memory. In a first time interval, an interrupt request has a low priority level and does not necessarily interrupt the operation of the computer. If the low priority interrupt request is not responded to, a second interrupt request with a high priority level is generated; this high priority level second interrupt request is responded to without fail.

公开(公告)号：US4048665A

公开(公告)日：1977-09-13

申请号：US641859

申请日：1975-12-17

申请人： Bruno Lia ,  Giorgio Vigini

发明人： Bruno Lia ,  Giorgio Vigini

IPC分类号： B41J2/30 ,  B41J9/44 ,  G06K15/06 ,  H01F7/18 ,  H03K17/64 ,  H01H47/32

CPC分类号： H01F7/18 ,  B41J9/44 ,  H03K17/64

摘要： A circuit for energizing the electromagnet of the print head of a high speed impact printer, wherein such circuit operates effectively with an unregulated supply voltage by providing energization current pulses whose level and duration are dependent on the present level of such supply voltage.

公开(公告)号：US3944122A

公开(公告)日：1976-03-16

申请号：US430250

申请日：1974-01-02

申请人： Emilio Pellicano

发明人： Emilio Pellicano

IPC分类号： B65H23/26 ,  G11B15/58 ,  G11B15/60 ,  B65H23/32

CPC分类号： G11B15/58 ,  G11B15/60

摘要： This disclosure relates to a guidance arrangement for web handler, for example of the type used for moving an elongated tape. A direction modifying idler roller has associated therewith means for maintaining the alignment of a tape with tape receiving and dispensing members disposed on opposite sides of the roller irrespective of any misalignment of the roller. Basically, the tape guidance means includes a fixed member having arcuate tape guide surfaces over which the tape slides and each guide surface having associated therewith shoulders which are resiliently mounted and which engage opposite edges of the tape.

摘要翻译： 本公开涉及用于卷筒纸处理器的引导装置，例如用于移动细长带的类型。 方向改变惰轮与其相关联的装置用于维持带与布置在辊的相对侧上的带接收和分配构件的对准，而与辊的任何未对准无关。 基本上，带引导装置包括具有弓形带引导表面的固定构件，带在其上滑动，每个引导表面具有相关联的肩部，弹性地安装并且与卡带的相对边缘接合。